Holder, replaceable print head, 3D printer, and control method therefor

Abstract

A holder (A40), a replaceable print head (A32), a 3D printer (A100), and a control method therefor. The holder (A40) is applied to the 3D printer (A100) comprising a tool head (A30). The tool head (A30) is configured such that after the tool head (A30) moves the replaceable print head (A32) to an alignment position of the holder (A40), the 3D printer (A100) places the replaceable print head (A32) onto the holder (A40). The holder (A40) comprises a holder body and at least one positioning member. The positioning member is configured to cooperate with the replaceable print head (A32) during a placement process of the replaceable print head (A32), so as to limit the position of the replaceable print head (A32) in at least one direction. The holder (A40) further comprises a blocking assembly. The blocking assembly is configured to cooperate with the replaceable print head (A32) during the placement process of the replaceable print head (A32), and to cover the outlet of a nozzle (A3223) during at least part of the placement process. The holder (A40) further comprises a filament position-limiting mechanism (A324). The filament position-limiting mechanism is configured to restrict the movement of a filament within a feeding channel when the replaceable print head (A32) is placed on the holder (A40). The solution facilitates replacement of the print head (A32), and prevents filament oozing in a non-operating state.

Description

Mounting rack, replaceable printhead, 3D printer and its control methods

[0001] This application claims priority to the international patent application filed on January 15, 2025, with application number PCT / CN2025 / 072614, entitled "An Additive Printing Toolhead", the entire contents of which are incorporated herein by reference.

[0002] This application claims priority to Chinese Patent Application No. 2025116218480, filed on November 6, 2025, entitled "Placement Frame, Replaceable Printhead, 3D Printer and Control Method Thereof", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of printing technology, and more specifically, to a mounting frame, a replaceable print head, a 3D printer, and a control method thereof. Background Technology

[0004] In recent years, additive printers have developed rapidly. Among them, additive printers with multiple printheads can meet users' needs for printing color models.

[0005] Dual-head printing assemblies are common printing assemblies, such as US2024 / 0009927A1 and CN115091750B. Both provide a dual-head printing assembly. Driven by a drive mechanism and in conjunction with a transmission structure, the first printhead can move up and down relative to the second printhead. Thus, when the working printhead is in use, the idle printhead will not interfere with or collide with the printed model. At the same time, the extrusion mechanism is driven to switch the extrusion position of the filament to correspond with the first or second printhead.

[0006] In the aforementioned prior art, a single drive mechanism and a complex transmission structure are used to simultaneously drive the extrusion mechanism and the filament switching mechanism, resulting in a large volume of drive mechanism and transmission structure. Since a single drive mechanism is used to drive the lifting and lowering of the print head, the extrusion and switching of the filament, this operation method usually directly acts on the lifting and lowering of the print head, resulting in insufficient flexibility and precision in control. Summary of the Invention

[0007] This application describes a placement frame for use in a 3D printer including a tool head, wherein the tool head is configured to move a replaceable print head to an alignment position on the placement frame, and the 3D printer places the replaceable print head on the placement frame; the placement frame includes a frame body and at least one positioning member, the positioning member being used to cooperate with the replaceable print head during placement to limit the replaceable print head in at least one direction.

[0008] In some embodiments, the tool head is configured to move the replaceable print head along the alignment direction to the alignment position of the placement frame, and then the 3D printer switches the replaceable print head from the mating position to the unlocked position along the assembly direction and places it on the placement frame.

[0009] In some embodiments, the tool head further includes a drive member and an assembly assembly, the assembly assembly being configured to adjust the position of the replaceable printhead relative to the tool head, the placement process of the replaceable printhead including: the drive member being configured to drive the assembly assembly to move such that the replaceable printhead switches from a mating position to an unlocked position along the assembly direction; and / or the placement bracket being configured to adjust the position of the replaceable printhead relative to the positioning member, the placement process of the replaceable printhead including: the placement bracket driving the positioning member to move along the assembly direction such that the positioning member engages with the replaceable printhead and limits the degree of freedom of movement of the replaceable printhead.

[0010] In some embodiments, the tool head can move within a printing plane to perform printing; after the 3D printer places the replaceable print head on the placement frame, the placement frame and / or the tool head move relative to each other along an alignment direction; after the distance between the tool head and the placement frame along the alignment direction reaches a preset value, the replaceable print head releases the restriction on the movement of the tool head within the printing plane.

[0011] In some embodiments, the positioning element includes a first positioning element for defining the degree of freedom of movement of the replaceable printhead along the alignment direction.

[0012] In some embodiments, one of the replaceable printhead and the first positioning member can be a hook, and the other can be a slot that engages with the hook; or, one of the replaceable printhead and the first positioning member can be a pin, and the other can be a slot that engages with the pin; or, one of the replaceable printhead and the first positioning member can be a magnet or electromagnet, and the other can be a magnetic element.

[0013] In some embodiments, the positioning element includes a third positioning element for defining the degree of freedom of movement of the replaceable printhead along an active direction, the active direction being perpendicular to the alignment direction and the assembly direction.

[0014] In some embodiments, the third positioning element includes at least two first sub-positioning portions, which are arranged at intervals along the direction of movement, and the interval between the two first sub-positioning portions is used to accommodate the replaceable printhead.

[0015] In some embodiments, the positioning element includes a first positioning element and a second positioning element, wherein the first positioning element is used to limit the degree of freedom of movement of the replaceable printhead along the alignment direction, and the second positioning element is used to limit the degree of freedom of movement of the replaceable printhead along the assembly direction; the placement process of the replaceable printhead includes the first positioning element first restricting the degree of freedom of movement of the replaceable printhead along the alignment direction, and then the second positioning element restricting the degree of freedom of movement of the replaceable printhead along the assembly direction.

[0016] In some embodiments, one of the replaceable printhead and the second positioning member can be a hook, and the other can be a slot that engages with the hook; or, one of the replaceable printhead and the second positioning member can be a pin, and the other can be a slot that engages with the pin; or, one of the replaceable printhead and the second positioning member can be a magnet, and the other can be a magnetic element.

[0017] In some embodiments, during the movement of the tool head to the alignment position, the second positioning member is activated to release the degree of freedom of movement of the replaceable print head along the assembly direction; after the 3D printer places the replaceable print head on the placement frame, the second positioning member, under the action of the power member, limits the degree of freedom of movement of the replaceable print head along the assembly direction.

[0018] In some embodiments, the power element is at least one of an elastic element, an electromagnetic element, a magnetic element, and an electric drive device; during the process of the tool head moving to the alignment position, the second positioning element moving to release the degree of freedom of movement of the replaceable print head along the assembly direction includes: the second positioning element being driven by the tool head and overcoming the force of the power element, so that the second positioning element moves to a position that releases the degree of freedom of movement of the replaceable print head along the assembly direction, or the power element actively drives the second positioning element to move to a position that releases the degree of freedom of movement of the replaceable print head along the assembly direction.

[0019] In some embodiments, one of the replaceable printhead and the second positioning element can be a magnet and the other can be a magnetic element, wherein the magnet is inclined away from the assembly direction from the surface of the magnetic element, and the surface of the magnetic element is inclined toward the magnet.

[0020] In some embodiments, the overall extending plane of the magnet toward the surface of the magnetic element forms an angle with the assembly direction.

[0021] In some embodiments, the side of the magnet facing the magnetic element includes two magnetic regions with opposite polarities.

[0022] In some embodiments, the two magnetic regions are arranged toward the assembly direction.

[0023] In some embodiments, the angle of inclination between the overall extending plane of the magnet and the magnetic element and the assembly direction is the same.

[0024] In some embodiments, the angle of inclination of the overall extending plane of the magnet and magnetic element relative to the assembly direction ranges from 5° to 90°.

[0025] In some embodiments, the angle of inclination of the overall extending plane of the magnet and magnetic element relative to the assembly direction ranges from 15° to 40°.

[0026] In some embodiments, the tool head further includes a mating motor and an extrusion mechanism, the extrusion mechanism including at least one of a mating wheel, an extrusion wheel, or a spacing adjustment assembly; the mating motor is drivenly connected to the mating wheel so that the mating wheel feeds the feed line into the heating chamber of the replaceable printhead, and / or, the drive member is used to drive the spacing adjustment assembly to move so that the extrusion wheel moves relative to the mating wheel, thereby adjusting the spacing between the extrusion wheel and the mating wheel; wherein, the replaceable printhead does not include the drive member and the mating motor.

[0027] In some embodiments, the positioning member includes a limiting portion for the degree of freedom of movement of the replaceable printhead along the assembly direction; the replaceable printhead has a feed channel and a notch, the feed line enters the heating chamber through the feed channel, the notch for exposing the feed line is provided in the middle of the feed channel, and the limiting portion contacts portions of the replaceable printhead located on both sides of the notch respectively.

[0028] In some embodiments, the replaceable printhead is also connected to a feed tube, one end of which is connected to the feed channel and the other end of which is connected to a feeding mechanism to deliver the material line to the replaceable printhead; the tool head can move in a printing plane to perform printing, and the placement frame has multiple replaceable printhead placement positions, with the multiple replaceable printheads arranged in one direction in the printing plane.

[0029] This application describes a 3D printer, comprising: a replaceable printhead, the replaceable printhead including a heating chamber and a nozzle, the heating chamber being used to heat the filament into a molten state and output the printed material through the nozzle; a placement frame, the placement frame being used to place the replaceable printhead; a tool head, the tool head being configured to move the replaceable printhead to an alignment position on the placement frame, after which the 3D printer places the replaceable printhead on the placement frame; and a sealing assembly, used to cooperate with the replaceable printhead during placement, for blocking the nozzle outlet at least partially during placement.

[0030] In some embodiments, the sealing assembly includes a scraper and a sealing portion. During the process of the replaceable printhead moving to the alignment position, the scraper wipes the nozzle of the replaceable printhead, and the sealing portion blocks the outlet of the nozzle after the replaceable printhead moves to the placement position to prevent the nozzle from leaking material.

[0031] In some embodiments, the wiping member first wipes the nozzle of the replaceable printhead, and then the sealing portion blocks the nozzle outlet.

[0032] In some embodiments, the placement process of the replaceable printhead includes: the 3D printer switching the replaceable printhead from the mating position to the unlocked position along the assembly direction and placing it on the placement rack; along the assembly direction, the highest point of the scraper is higher than or level with the height of the nozzle tip; and / or, along the assembly direction, the highest point of the scraper is higher than the highest point of the sealing portion; and / or, the hardness of the scraper material is higher than the hardness of the sealing portion material; and / or, the scraper material is metal, and the sealing portion is a flexible material.

[0033] In some embodiments, the tool head is configured to move the replaceable print head along the alignment direction to the alignment position of the placement frame, and then the 3D printer switches the replaceable print head from the mating position to the unlocked position along the assembly direction and places it on the placement frame; the scraper includes a shielding surface that contacts the nozzle, and along the alignment direction, the height of the shielding surface gradually increases as the replaceable print head approaches the placement frame.

[0034] In some embodiments, the placement process of the replaceable printhead includes: the 3D printer switching the replaceable printhead from a mating position to an unlocked position along the assembly direction and placing it on the placement frame; the sealing component is disposed on the placement frame or the tool head, and during at least part of the movement of the replaceable printhead from the mating position to the unlocked position, the sealing component is configured to block the nozzle outlet.

[0035] In some embodiments, the tool head is configured to move the replaceable printhead to an alignment position on the placement rack along an alignment direction, and the blocking assembly is disposed along the path of the tool head along the alignment direction to block the nozzle outlet as the replaceable printhead moves along the alignment direction.

[0036] In some embodiments, the blocking component is disposed on the placement frame, the blocking component is provided with a first alignment portion, and the replaceable printhead is provided with a second alignment portion. The first alignment portion and the second alignment portion cooperate with each other during the placement process, thereby enabling the blocking component and the replaceable printhead to move synchronously when in a blocked state.

[0037] In some embodiments, the replaceable printhead further includes a heat sink and a throat, the heat sink being used to dissipate heat from the throat, the throat being located between the heat sink and the heating chamber; the second alignment portion is disposed on the heat sink.

[0038] In some embodiments, the sealing assembly includes a body, and the first alignment portion is disposed on the body; the first alignment portion and the body are made of thermally conductive materials.

[0039] In some embodiments, the blocking assembly includes a body, the first alignment portion being disposed on the body; the placement frame includes a movement groove extending along the assembly direction, the first alignment portion being a pin and passing through the movement groove, and the second alignment portion being a slot for aligning and engaging with the pin; or, the placement frame includes a movement groove extending along the assembly direction, the first alignment portion being a slot, the opening of the slot at least partially coinciding with the opening of the movement groove, and the second alignment portion being a pin for aligning and engaging with the slot.

[0040] In some embodiments, the blocking assembly is disposed on the placement frame. The blocking assembly includes a blocking part and a first elastic part. The blocking part is used to contact and block the nozzle outlet. One end of the first elastic part is connected to the blocking part. The blocking part moves synchronously with the replaceable printhead during the placement process, causing the first elastic part to be compressed or stretched along the assembly direction during the placement process, so that the elastic restoring force provided by the first elastic part to the replaceable printhead increases synchronously with the movement of the replaceable printhead.

[0041] In some embodiments, the blocking portion includes a body and a spring sheet, the spring sheet being used to contact and block the nozzle outlet, the spring sheet being made of an elastic material, and the elastic coefficient of the spring sheet being greater than that of the first elastic portion.

[0042] In some embodiments, the blocking portion includes a body and a spring, the spring being used to contact and block the nozzle outlet, the highest point of the spring in the assembly direction being higher than or flush with the lowest point of the nozzle outlet in the unlocked position.

[0043] In some embodiments, the spring is made of metal.

[0044] In some embodiments, the spring includes a shielding surface that contacts the nozzle, the shielding surface and the orthographic projection of the replaceable printhead onto the plane in the direction of the replaceable printhead toward the placement frame are at an angle, and the height of the shielding surface gradually increases as the replaceable printhead moves toward the placement frame.

[0045] In some embodiments, the blocking portion includes a second elastic portion, which is made of an elastic material. The second elastic portion is used to contact and block the nozzle outlet. Along the direction of the tool head approaching the placement frame, the spring is disposed between the second elastic portion and the nozzle outlet. When the replaceable printhead is in the unlocked position, the highest point of the second elastic portion in the assembly direction is higher than or flush with the lowest point of the nozzle outlet in the unlocked position.

[0046] In some embodiments, the second elastic portion is a rubber component.

[0047] This application describes a replaceable printhead, which is detachably mounted on a tool head mounting base during the printing process. After being separated from the mounting base, the replaceable printhead is placed in a placement rack. The replaceable printhead includes a feeding channel and a heating chamber, through which the feed line enters the heating chamber; and a wire limiting mechanism for restricting the movement of the feed line within the feeding channel when the replaceable printhead is placed in the placement rack.

[0048] In some embodiments, when the tool head cooperates with the replaceable print head to perform a printing task, the wire limiting mechanism is in a state of releasing the restriction on the wire.

[0049] In some embodiments, a limiting member is further provided on the tool head or the placement rack. The limiting member is used to cooperate with the wire limiting mechanism to restrict the movement of the wire in the feeding channel, or to release the wire limiting mechanism from restricting the movement of the wire.

[0050] In some embodiments, the wire limiting mechanism includes a movable limiting member and a resetting member. The limiting member cooperates with the wire limiting mechanism to either restrict the movement of the wire within the feeding channel or release the restriction on the movement of the wire within the feeding channel. The resetting member, when the limiting member is released from cooperation with the wire limiting mechanism, causes the wire limiting mechanism to either restrict the movement of the wire within the feeding channel or release the restriction on the movement of the wire within the feeding channel.

[0051] In some embodiments, the movable limiting member includes a limiting structure disposed at the end of the movable limiting member. The limiting structure is a cutting edge, tip, protrusion structure that can engage a wire, or a tooth-shaped, hook-shaped, or claw-shaped structure that extends downward.

[0052] In some embodiments, the wire limiting mechanism includes a movable limiting member and an elastic reset member; the limiting member cooperates with the wire limiting mechanism to restrict the movement of the wire within the feeding channel; when the limiting member is disengaged from the wire limiting mechanism, the elastic reset member releases the wire limiting mechanism from restricting the movement of the wire; or, the limiting member cooperates with the wire limiting mechanism to release the wire limiting mechanism from restricting the movement of the wire; when the limiting member is disengaged from the wire limiting mechanism, the elastic reset member releases the wire limiting mechanism from restricting the movement of the wire.

[0053] In some embodiments, the reset element is at least one of an elastic reset element, a magnetic element, an electromagnet, and a motor.

[0054] This application describes a 3D printer, comprising: a replaceable printhead having a feeding channel and a heating chamber, wherein a filament enters the heating chamber through the feeding channel; a tool head for engaging or disengaging with the replaceable printhead, wherein when the tool head engages with the replaceable printhead, an extrusion mechanism engages with the replaceable printhead and feeds the filament into the heating chamber to perform a printing task; a placement frame for placing the replaceable printhead disengaged from the extrusion mechanism; and a filament limiting mechanism for restricting the movement of the filament within the feeding channel when the replaceable printhead is placed on the placement frame.

[0055] In some embodiments, the wire limiting mechanism is disposed on the replaceable print head, and the wire limiting mechanism is configured to switch from a wire release state to a wire locking state under the action of the placement frame, or to switch from a wire locking state to a wire release state under the action of the tool head.

[0056] In some embodiments, the tool head is configured to move the replaceable print head to the alignment position of the placement frame, and then the 3D printer places the replaceable print head on the placement frame; and / or, the tool head picks up the replaceable print head from the placement frame and continues printing after leaving the alignment position; the placement frame is provided with a limiting member, which is configured to cause the filament limiting mechanism to switch from a filament release state to a filament locking state when the replaceable print head reaches the alignment position or during the placement of the replaceable print head; and / or, the limiting member is configured to cause the filament limiting mechanism to switch from a filament locking state to a filament release state during the tool head picking up the replaceable print head or after the replaceable print head leaves the alignment position.

[0057] In some embodiments, the replaceable printhead has a slot communicating with the feeding channel. The wire limiting mechanism includes a movable limiting member and a resetting member. The movable limiting member is at least partially disposed within the slot. After the replaceable printhead is placed on the placement frame, the movable limiting member abuts against the placement frame to lock the wire. The resetting member is used to reset the movable limiting member after the replaceable printhead leaves the alignment position, so that the movable limiting member releases the wire. Alternatively, the replaceable printhead has a slot communicating with the feeding channel. The wire limiting mechanism includes a movable limiting member and a resetting member. The movable limiting member is at least partially disposed within the slot. After the replaceable printhead leaves the alignment position, the movable limiting member abuts against the tool head to release the wire. The resetting member is used to reset the movable limiting member after the replaceable printhead is placed on the placement frame, so that the movable limiting member locks the wire.

[0058] In some embodiments, the reset element is at least one of an elastic reset element, a magnetic element, an electromagnet, and a motor.

[0059] In some embodiments, the movable limiting member includes a limiting structure disposed at the end of the movable limiting member. The limiting structure is a cutting edge, tip, protrusion structure that can engage a wire, or a tooth-shaped, hook-shaped, or claw-shaped structure that extends downward.

[0060] In some embodiments, the movable limiting member switches between the released feed line state and the locked feed line state by moving or rotating.

[0061] In some embodiments, the wire limiting mechanism is disposed on the placement frame, and the wire limiting mechanism is configured to switch from a wire releasing state to a wire locking state under the action of the tool head, and / or, when the tool head is disengaged from the placement frame, the wire limiting mechanism is in the wire releasing state.

[0062] In some embodiments, the tool head is configured to move the replaceable print head to the alignment position of the placement frame, and then the 3D printer places the replaceable print head on the placement frame; the filament limiting mechanism is configured to lock the filament when the tool head moves to the alignment position of the placement frame or during the placement of the replaceable print head, and / or the limiting member is configured to switch from a filament-locking state to a filament-releasing state during the process of the tool head picking up the replaceable print head or after the tool head leaves the alignment position.

[0063] This application describes a 3D printer, comprising: a replaceable printhead connected to a feed tube, one end of which is connected to a feed channel and the other end to a feeding mechanism for conveying a feed line to the replaceable printhead; a placement frame having multiple replaceable printhead placement positions, each corresponding to a different replaceable printhead; and a tool head equipped with a signal element. When the replaceable printhead moves to the alignment position of the placement frame or is in the placement position, the placement frame is equipped with a detection element corresponding to the signal element. The detection element is used to detect the signal generated by the replaceable printhead signal element to determine whether the replaceable printhead is in place or in the corresponding placement position.

[0064] In some embodiments, the combination of the signal element and the detection element is at least one of the following: the replaceable print head is provided with a heating element, the heating element is connected to the 3D printer via a wiring harness to obtain heating current, the signal element is the wiring harness, and the detection element is an inductive sensor; or, the signal element is a light source, and the detection element is a photoelectric sensor; or, the signal element is a coil, and the detection element is a Hall sensor.

[0065] In some embodiments, the replaceable printhead has a feed channel and a notch, through which the feed line enters the heating chamber. The notch is provided in the middle of the feed channel to expose the feed line for engagement with the tool head. The wire harness is disposed on the side of the replaceable printhead away from the notch and facing the placement frame. When the replaceable printhead moves to the alignment position of the placement frame or is in the placement position, the wire harness is correspondingly disposed with the detection element on the placement frame.

[0066] This application describes a control method for a 3D printer, comprising: the 3D printer including a tool head equipped with a replaceable print head, the replaceable print head including a heating chamber and a nozzle, the heating chamber for heating the filament into a molten state and outputting it through the nozzle to a heated bed for layer-by-layer printing in the height direction; the tool head replacing the replaceable print head including: the tool head being configured to move the replaceable print head along an alignment direction to an alignment position on a placement frame; the 3D printer switching the replaceable print head from a mating position to an unlocked position along an assembly direction and placing it on the placement frame; the placement frame driving the replaceable print head to descend along the height direction so that the replaceable print head is aligned with the unlocked position on the tool head; and controlling the heated bed to descend a preset distance during or before the descent of the placement frame.

[0067] In some embodiments, when the printing height is between 0-20mm, the heated bed is controlled to descend a preset distance when the tool head replaces the replaceable print head.

[0068] In some embodiments, the placement rack includes a blocking component for cooperating with the replaceable printhead during placement to block the nozzle outlet at least partially during placement.

[0069] Other beneficial effects of this application will be explained in detail through the introduction of specific technical features and technical solutions in the specific embodiments. Those skilled in the art should be able to understand the beneficial technical effects brought about by the technical features and technical solutions through the introduction of these technical features and technical solutions. Attached Figure Description

[0070] The preferred embodiments of this application will now be described with reference to the accompanying drawings.

[0071] Figure 1 is a top view of a limiting component and a wire limiting mechanism for an additive printing tool head according to this application;

[0072] Figure 2 is a schematic diagram of a limiting component and a wire limiting mechanism for an additive printing tool head according to this application;

[0073] Figure 3 is a partial schematic diagram of the first limiting member and the first wire limiting mechanism of an additive printing tool head according to this application;

[0074] Figure 4 is a partial schematic diagram of the second limiting member of an additive printing tool head according to this application;

[0075] Figure 5 is a partial schematic diagram of the first limiting member of an additive printing tool head according to this application;

[0076] Figure 6 is a partial schematic diagram of a wire limiting mechanism for an additive printing tool head according to this application;

[0077] Figure 7 is a schematic diagram of the structure of a 3D printer in some embodiments of this application;

[0078] Figure 8 is a partial structural schematic diagram of the 3D printer in the embodiment shown in Figure 7;

[0079] Figure 9 is a schematic diagram of the structure of the motion system and tool head shown in Figure 8 when they are engaged in some other embodiments;

[0080] Figure 10 is a schematic diagram of the tool head in some embodiments of the embodiment shown in Figure 9;

[0081] Figure 11 is an exploded view of the tool head in some embodiments of the embodiment shown in Figure 10;

[0082] Figure 12 is an assembly diagram of some tool heads in the embodiment shown in Figure 11 in some embodiments;

[0083] Figure 13 is a structural schematic diagram of the replaceable printhead in some embodiments of the embodiment shown in Figure 12;

[0084] Figure 14 is a partial structural diagram of the replaceable printhead in the embodiment shown in Figure 13;

[0085] Figure 15 is a schematic diagram of the structure of the wire limiting mechanism and the wire in the embodiment shown in Figure 14.

[0086] Figure 16 is a partial structural diagram of the replaceable printhead in the embodiment shown in Figure 13;

[0087] Figure 17 is a partial structural diagram of the tool head in some embodiments of the embodiment shown in Figure 12;

[0088] Figure 18 is a partial structural diagram of the tool head in the embodiment shown in Figure 12;

[0089] Figure 19 is a schematic diagram of the structure of the placement rack in some embodiments of the embodiment shown in Figure 8;

[0090] Figure 20 is a schematic diagram of the placement rack in some other embodiments of the embodiment shown in Figure 8;

[0091] Figure 21 is a structural schematic diagram of the placement rack and tool head in the embodiment shown in Figure 20 when the replaceable print head is loaded or removed.

[0092] Figure 22 is a schematic diagram of the structure of the placement rack and tool head in the embodiment shown in Figure 20 when the replaceable print head is loaded or removed.

[0093] Figure 23 is an exploded view of the placement rack in some embodiments of the embodiment shown in Figure 21;

[0094] Figure 24 is an exploded view of the placement rack in some embodiments of the embodiment shown in Figure 21;

[0095] Figure 25 is a schematic diagram of the placement rack in some other embodiments of the embodiment shown in Figure 19;

[0096] Figure 26 is a partial enlarged view of the placement frame and the replaceable printhead in the embodiment shown in Figure 25;

[0097] Figure 27 is a schematic diagram of the placement rack and the replaceable printhead in the embodiment shown in Figure 25.

[0098] Figure 28 is a partially enlarged schematic diagram of the placement frame and the replaceable printhead in the embodiment shown in Figure 27.

[0099] Figure 29 is a partially enlarged view of the embodiment shown in Figure 27 when the placement rack is engaged with the replaceable printhead.

[0100] Figure 30 is a structural schematic diagram of the replaceable printhead in some embodiments of the embodiment shown in Figure 13;

[0101] Figure 31 is a partial structural schematic diagram of a 3D printer in some embodiments of this application. Embodiments of the present invention

[0102] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0103] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0104] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0105] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0106] Regarding the prior art mentioned in the background section, after extensive experimentation and analysis, this application has also identified the following further technical problems:

[0107] The current operating method often results in the filament in the print head that has finished printing being squeezed out and moved when one print head finishes its job and switches to another print head. This can cause unwanted nozzle material to overflow from the print head that has finished printing.

[0108] Furthermore, the undesirable overflow of filaments and the accidental overflow of filaments from a printhead in a non-working state can affect the ongoing printing process. How to avoid the impact of the overflowing filaments on printing is a technical problem that urgently needs to be solved.

[0109] Furthermore, the arrangement of the extrusion mechanism, switching mechanism, cutting mechanism, lifting mechanism, and cooling mechanism of the tool head in the existing technology is not compact enough, and the force applied by each mechanism component is not optimized, resulting in a large tool head size and the fact that the cutter can be removed, which may cause safety issues.

[0110] In addition, when one of the wires in the tool head of the prior art is not in working condition, the wire may be pulled as the tool head moves, which may lead to inaccurate control of the next flush volume of the nozzle, or may pull a part of the molten but not completely solidified wire into the throat of the hot end and block the nozzle.

[0111] The existing tool head lifting nozzle's movable hot end still has the problem of low heat dissipation efficiency. If the air outlet is aimed at the position where the movable hot end is below, there will be a misalignment between the air outlet and the heat sink of the movable hot end when the movable hot end is above, meaning that some air will not reach the heat sink.

[0112] Based on the discovery of the above-mentioned technical problems, this application proposes a series of technical solutions to solve the problems of the prior art discovered in this application one by one.

[0113] As shown in Figures 1-6, the wire channel includes a first wire channel and a second wire channel; the switching mechanism and the extrusion mechanism cooperate to allow the first wire in the first wire channel and the second wire in the second wire channel to work alternately; it also includes a first cover, which is disposed on the mounting body; the first cover is provided with a first limiting member 431 and a second limiting member 432; the first swing mechanism is provided with a first wire limiting mechanism 441, and the second swing mechanism is provided with a second wire limiting mechanism 442; when the first wire channel is in at least one position of non-working state, the first limiting member 431 cooperates with the first wire limiting mechanism 441 to restrict the first wire in the first wire channel from moving upward; when the second wire channel is in at least one position of non-working state, the second limiting member 432 cooperates with the second wire limiting mechanism 442 to restrict the second wire in the second wire channel from moving upward. The first limiting member 431 includes a first steel ball 4311 and a first mounting groove 4313, and the second limiting member 432 includes a second steel ball 4321 and a second mounting groove 4323. The first wire limiting mechanism 441 includes a first movable limiting member 4411 and a first limiting structure 4412, and the second wire limiting mechanism 442 includes a second movable limiting member 4421 and a second limiting structure 4422. The first movable limiting member 4411 and the first limiting structure 4412 can be integrally formed or separately formed; the second movable limiting member 4421 and the second limiting structure 4422 can be integrally formed or separately formed. The first mounting groove 4313 and the second mounting groove 4323 are disposed on the first cover; the first limiting member 431 is disposed opposite to the first wire channel, and the second limiting member 432 is disposed opposite to the second wire channel; the first wire limiting mechanism 441 is disposed on the first swing mechanism, and the second wire limiting mechanism 442 is disposed on the second swing mechanism; when the first wire channel is at the end position of the non-working state, the first limiting member 431 abuts against the first wire limiting mechanism 441; when the second wire channel is at the end position of the non-working state, the second limiting member 432 abuts against the second wire limiting mechanism 442. When the first wire channel or the second wire channel is in the working state, the first wire limiting mechanism 441 or the second wire limiting mechanism 442 returns to the position that does not restrict the upward movement of the wire under the action of the wire or elastic element.

[0114] Specifically, the first limiting structure 4412 or the second limiting structure 4422 is a cutting edge, tip, protrusion, or other structure disposed at the end of the first movable limiting member 4411 or the second movable limiting member 4421, capable of engaging the wire, used to restrict the upward movement of the wire at the end position in the non-working state. In one embodiment, the first limiting structure 4412 or the second limiting structure 4422 is a one-way limiting structure. Specifically, the first limiting structure 4412 and the second limiting structure 4422 are downwardly extending tooth-like, hook-like, or claw-like structures. The first limiting structure 4412 or the second limiting structure 4422 has a slope or arc surface and a cutting edge or tip for engaging the wire. When the wire moves from top to bottom, it can act on the slope or arc surface, causing the one-way limiting structure to move away from the wire. When the wire moves from bottom to top, the wire is engaged by the cutting edge or tip for engaging the wire, restricting its movement.

[0115] It also includes a first elastic mechanism 4312 and a second elastic mechanism 4322. One end of the first elastic mechanism 4312 is disposed in the first mounting groove 4313, and the other end is connected to a first steel ball 4311. One end of the second elastic mechanism 4322 is disposed in the second mounting groove 4323, and the other end is connected to a second steel ball 4321. The first steel ball 4311 and the second steel ball 4321 both protrude at least partially from the first mounting groove 4313 and the second steel ball 4321, respectively. When the first wire channel is in at least one non-working position, the first steel ball 4311 abuts against the first movable limiting member 4411, causing the first limiting structure 4412 to at least partially enter the first wire channel and compress the first wire. When the second wire channel is in at least one non-working position, the second steel ball 4321 abuts against the second movable limiting member 4421, causing the second limiting structure 4422 to at least partially enter the second wire channel and compress the second wire. The first elastic mechanism 4312 and the second elastic mechanism 4322 are springs. By setting an elastic mechanism, the force applied during the pushing process can be made gentler, reducing the chance of jamming and increasing the service life of the first wire limiting mechanism 441 or the second wire limiting mechanism 442.

[0116] It also includes a first elastic reset member 4413 disposed on the first swing mechanism and a second elastic reset member 4423 disposed on the second swing mechanism; one end of the first elastic reset member 4413 is connected to the first movable limiting member 4411 and the other end is connected to the first swing mechanism. When the first wire channel is in the working state or between the working state and the end position of the non-working state, the first movable limiting member 4411 moves away from the wire under the action of the first elastic reset member 4413; one end of the second elastic reset member 4423 is connected to the second movable limiting member 4421 and the other end is connected to the second swing mechanism 406. When the second wire channel is in the working state or between the working state and the end position of the non-working state, the second movable limiting member 4421 moves away from the wire under the action of the second elastic reset member 4423.

[0117] It should be noted that, through the limiting function of the wire limiting mechanism, the wire in the non-working state will be reliably fixed and will not be pulled by external forces (such as tool head movement, wire guide tube shaking, etc.). This avoids inaccurate control of the spray volume in the next spray and also prevents the problem of some melted but not completely solidified wire being pulled into the throat of the hot end and thus clogging the spray head.

[0118] Next, this application describes a 3D (Three Dimensions) printer. The 3D printer A100 can be used to heat and melt a filament to form a printing material, and to build objects by stacking the printing material layer by layer, thereby realizing the printing of three-dimensional models.

[0119] Please refer to Figures 7 and 8. Figure 7 is a structural schematic diagram of the 3D printer A100 in some embodiments of this application, and Figure 8 is a partial structural schematic diagram of the 3D printer A100 in the embodiment shown in Figure 7. The 3D printer A100 may include a body A10, a motion system A20, and a tool head A30. Further referring to Figures 8 and 9, Figure 9 is a structural schematic diagram of the motion system A20 and the tool head A30 shown in Figure 8 when they are engaged in other embodiments. The motion system A20 may be disposed on the body A10. The tool head A30 may be disposed on the motion system A20. The motion system A20 can drive the tool head A30, realizing the movement of the tool head A30.

[0120] The body A10 may have orthogonally arranged length direction X, width direction Y, and height direction Z. The motion system A20 can be used to drive the tool head A30 along at least one of the three directions X, Y, and Z, thereby moving the tool head A30. In some embodiments, the height direction Z may be the direction of gravity.

[0121] For example, motion system A20 can drive tool head A30 on a printing plane defined by length direction X and width direction Y. Using tool head A30, the three-dimensional model is printed layer by layer with printing material. Then, motion system A20 continues to adjust the position of tool head A30 in height direction Z, and then further drives tool head A30 on another printing plane defined by length direction X and width direction Y. Using tool head A30, the three-dimensional model is printed layer by layer with printing material. This process is repeated multiple times to complete the layer-by-layer stacking of printing material and realize the printing of the three-dimensional model.

[0122] It is understandable that the body A10 and the motion system A20 can be configured based on technical solutions known to those skilled in the art, and will not be elaborated upon.

[0123] Please refer to Figure 7. The 3D printer A100 may have an opening A1001. The opening A1001 connects the interior of the 3D printer A100 to the outside. Users can use the opening A1001 to adjust or repair internal structures of the 3D printer A100, such as the mounting frame A40 and tool head A30. The replaceable print head A32 includes a wiring harness. The heating element A3224 is connected to the internal structure of the 3D printer A100 via the wiring harness to obtain heating current. The replaceable print head A32 has a wiring harness connector for electrical connection to the wiring harness on the 3D printer A100.

[0124] In some embodiments, the 3D printer A100 also includes a door panel A1002, which is used to close the opening A1001, thereby helping to maintain a constant internal temperature and improve printing quality. Additionally, the door panel A1002 can also be used to replace or maintain the tool head A30 or the replaceable print head A32.

[0125] This application also describes a tool head A30. Please refer to Figures 10 and 11. Figure 10 is a structural schematic diagram of the tool head A30 in some embodiments of the embodiment shown in Figure 9, and Figure 11 is an exploded view of the tool head A30 in some embodiments of the embodiment shown in Figure 10. The tool head A30 can be used in a 3D printer A100 as a core printing component of the 3D printer A100. It is designed to heat and melt the filament and can also output printing material. Furthermore, it moves under the control of the 3D printer A100, for example, the motion system A20, to achieve the layer-by-layer stacking of printing material and complete the printing of a three-dimensional model.

[0126] The tool head A30 may include a mounting base A31, a replaceable print head A32, and an extrusion mechanism A33. The mounting base A31 allows for the mounting of structures on the tool head A30, such as the replaceable print head A32 and the extrusion mechanism A33. The replaceable print head A32 is detachably mounted on the mounting base A31. A feed line can enter the replaceable print head A32. The replaceable print head A32 can heat and melt the feed line and output the printed material. The extrusion mechanism A33 can extrude the feed line, thereby conveying the feed line by compressing and driving it. The extrusion mechanism A33 can convey the feed line into the replaceable print head A32, where it can be heated and melted, and then output to complete the printing.

[0127] In some embodiments, the mounting base A31 may be the mounting body in the above embodiments.

[0128] In some embodiments, the tool head A30, such as the mounting base A31, may be mounted on the motion system A20. The motion system A20 can drive the tool head A30, such as the mounting base A31, to move, thereby causing the replaceable print head A32 to move accordingly. While outputting printing material, based on the control of the 3D printer A100, such as the motion system A20, the printing material is stacked layer by layer to complete the printing of the three-dimensional model.

[0129] Referring to Figure 8, the 3D printer A100 may also include a mounting rack A40. The mounting rack A40 can be used to hold the replaceable printhead A32. For example, unused replaceable printhead A32 can be placed on the mounting rack A40. Alternatively, the replaceable printhead A32 that is needed can be removed from the mounting rack A40.

[0130] Please refer to Figures 10, 11, and 12. Figure 12 is an assembly diagram of some tool heads A30 in the embodiment shown in Figure 11 in some embodiments. A replaceable print head A32 can be detachably mounted on the tool head A30, for example, the mounting base A31, during the printing process. The replaceable print head A32 can then be replaced based on the type of feed line, color, maintenance needs, or other requirements. That is, the replaceable print head A32 to be replaced can be removed from the tool head A30, for example, the mounting base A31, and a replacement replaceable print head A32 can be mounted on the tool head A30, for example, the mounting base A31.

[0131] Understandably, to enable the A100 3D printer to adapt to different types of filaments or 3D models, or other requirements, multiple replaceable printheads A32 can be provided. These replaceable printheads may differ from each other in structure, performance, size, or material to match the requirements of different types of filaments or 3D models. The replaceable printheads A32 are selectable and replaceable, and are mounted on the mounting base A31 for use. This significantly reduces material waste from flushing, saves time changing filaments, and improves printing efficiency.

[0132] In some embodiments, a replaceable printhead A32 can be detached from a tool head A30, such as a mounting base A31, and another replaceable printhead A32 can be mounted on the tool head A30, such as the mounting base A31. In a further embodiment, the detached replaceable printhead A32 can be placed on a placement rack A40. In a further embodiment, the tool head A30, such as the mounting base A31, can mount another replaceable printhead A32 from the placement rack A40, and the other replaceable printhead A32 can be removed from the placement rack A40.

[0133] Please refer to Figures 10, 11, 12, and 13. Figure 13 is a schematic diagram of the replaceable printhead A32 in some embodiments of the embodiment shown in Figure 12. The replaceable printhead A32 can melt the filament extending into it, for example, the replaceable printhead A32, to form printing material, and can output the printing material to realize the printing of a three-dimensional model.

[0134] The replaceable printhead A32 may include a connector A321. In some embodiments, the connector A321 may be mounted on a tool head A30, such as a mounting base A31. In some embodiments, the replaceable printhead A32 may further include a feed channel A322 to allow a feed line to enter the replaceable printhead A32. In some embodiments, the feed channel A322 may be disposed on the connector A321. In some embodiments, the feed channel A322 may be mounted on the mounting base A31. In a further embodiment, the connector A321 and the feed channel A322 may cooperate to mount the replaceable printhead A32 on the mounting base A31.

[0135] In some embodiments, the feed channel A322 is provided with a notch A3201 for exposing the feed line. The notch A3201 may be provided corresponding to the extrusion mechanism A33, thereby enabling the extrusion mechanism A33 to extrude the feed line at the notch A3201 and deliver it to the replaceable printhead A32. In some embodiments, the notch A3201 may be located in the middle of the feed channel A322.

[0136] In some embodiments, the feed channel A322 may include a feed tube A3221, a throat A3222, and a nozzle A3223. The throat A3222 connects the feed tube A3221 and the nozzle A3223. The end of the feed tube A3221 not connected to the throat A3222 can receive the feed line. The feed line can pass sequentially through the feed tube A3221, the throat A3222, and then enter the nozzle A3223.

[0137] In some embodiments, the filament can be provided by a feeding device A50, and the end of the insert tube A3221 not connected to the throat tube A3222 can cooperate with the feeding device A50, so that the filament on the feeding device A50 can be conveyed into the insert tube A3221, and further conveyed into the throat tube A3222 and the nozzle A3223. That is, the 3D printer A100 may also include a feeding device A50 (i.e., a feeding mechanism), which is connected to a replaceable print head A32 to convey the filament to the replaceable print head A32.

[0138] In some embodiments, the insert tube A3221 may be disposed on the connector A321.

[0139] In some embodiments, the insert tube A3221 can be connected to the feeding device A50 via the feed tube A501, allowing the feed line in the feeding device A50 to be conveyed through the feed tube A501 into the insert tube A3221, and further into the throat tube A3222. That is, the replaceable printhead A32, for example, the feed channel A322, is connected to the feed tube A501, with one end of the feed tube A501 connected to the replaceable printhead A32 and the other end connected to the feeding device A50, to convey the feed line to the replaceable printhead A32.

[0140] In some embodiments, the feed tube A501 may be part of the insertion tube A3221. That is, the feed tube A501 may be part of the feed channel A322. In some embodiments, the insertion tube A3221 may not be part of the replaceable printhead A32. Furthermore, the feeding device A50 is connected to the replaceable printhead A32 via the insertion tube A3221. In some embodiments, one end of the feed tube A501 may be connected to the throat tube A3222. That is, the insertion tube A3221 may be part of the feed tube A501.

[0141] In some embodiments, the replaceable printhead A32 may further include a feed tube A3221, which connects to the feed channel A322 and enters the extrusion mechanism A33 via a feed line. The feed tube A3221 is used to connect to the feed tube A501. The wiring harness connector is located on the side of the replaceable printhead A32 away from the mounting frame A40, and the feed tube A3221 is located on the side of the replaceable printhead A32 facing the mounting frame A40. The mounting frame A40 is positioned close to the opening A1001, such that when viewed from the opening A1001, the feed tube A3221 is closer to the opening A1001 than the wiring harness connector. Consequently, the feed tube A501 connected to the feed tube A3221 is closer to the opening A1001 than the wiring harness. This facilitates user operation, such as inserting or removing the feed tube A501. In some embodiments, the feed tube A501 is made of a semi-transparent material, allowing the user to more clearly observe the material line in the feed tube A501 from the open port A1001 side, which helps to determine whether there is a material breakage and the feeding status, etc.

[0142] In some embodiments, the placement rack A40 has multiple placement positions for replaceable printheads A32, with different placement positions corresponding to different replaceable printheads A32. By assigning a fixed placement position to each different replaceable printhead A32, the replaceable printheads A32 can be arranged in an orderly manner. Since the replaceable printheads A32 are also connected to the feed tube A501, placing each replaceable printhead A32 in a different placement position can prevent the feed tube A501 from getting tangled and interfering with the printing process.

[0143] In some embodiments, the throat tube A3222 may be disposed on the connector A321.

[0144] In some embodiments, nozzle A3223 is connected to one end of throat A3222, allowing the material to enter nozzle A3223 through throat A3222. Nozzle A3223 further heats and melts the material before outputting it. In some embodiments, nozzle A3223 may be provided with a heating chamber to heat and melt the material. Alternatively, when nozzle A3223 does not have a heating chamber for melting the material, feed channel A322 may include a heating element A3224 with a heating chamber. Heating element A3224 is connected between throat A3222 and nozzle A3223, allowing the material to be conveyed through throat A3222 into heating element A3224 for melting. Alternatively, heating element A3224 can wirelessly heat nozzle A3223, such as through electromagnetic heating, induction heating, or infrared heating. Furthermore, nozzle A3223 can then deliver printing material. That is, the replaceable printhead A32 may include a heating chamber that can melt the feed line extending into the replaceable printhead A32. In some embodiments, the replaceable printhead A32 may include a heating chamber and a nozzle A3223, the heating chamber heating the feed line into a molten state and outputting the printed material through the nozzle A3223. In some embodiments, the heating chamber may be formed between the nozzle A3223 and the throat A3222. That is, the heating chamber can connect the nozzle A3223 and the throat A3222.

[0145] In some embodiments, the nozzle A3223 is integrally formed, and the nozzle A3223 and the throat A3222 are connected by adhesive, interference fit or threaded connection, etc.

[0146] In some embodiments, the replaceable printhead A32 further includes a heat sink A3225, which dissipates heat from the throat A3222, located between the heat sink A3225 and the heating chamber. The heat sink effectively reduces the temperature of the throat A3222, minimizing the melting of the feed line within the throat and further preventing feed line blockage of the tube orifice.

[0147] In some embodiments, the throat A3222 and the heat sink A3225 are connected by adhesive / interference / thread. When connected only by the throat A3222, there are only two dimensional chains. Therefore, the alignment and fit on the heat sink A3225 facilitates tolerance control.

[0148] In some embodiments, the replaceable printhead A32 may be provided with an assembly part 325 to cooperate with the placement frame A40, so as to realize the installation of the replaceable printhead A32 on the placement frame A40 through the assembly part 325.

[0149] Please refer to Figures 13, 14, and 15. Figure 14 is a partial structural schematic diagram of the replaceable printhead A32 in the embodiment shown in Figure 13, and Figure 15 is a structural schematic diagram of the filament limiting mechanism A324 in the embodiment shown in Figure 14 when it engages with the feed line. The replaceable printhead A32 may further include the filament limiting mechanism A324, which can restrict the movement of the feed line within the feed channel A322. In some scenarios, the filament limiting mechanism A324 can restrict the movement of the feed line within the feed channel A322 when the replaceable printhead A32 is placed on the placement rack A40. In some scenarios, the filament limiting mechanism A324 can restrict the movement of the feed line within the feed channel A322 when the motion system A20 drives the replaceable printhead A32.

[0150] In some embodiments, the wire limiting mechanism A324 may be the first wire limiting mechanism 441 or the second wire limiting mechanism 442 in the above embodiments.

[0151] In some embodiments, when the tool head A30 and the replaceable print head A32 cooperate to perform a printing task, the wire enters the heating chamber through the feed channel A322 of the replaceable print head A32, and the wire limiting mechanism A324 is in a state of releasing the restriction on the wire.

[0152] In some embodiments, a limiting member is also provided on the tool head A30 or the placement rack A40. The limiting member is used to cooperate with the wire limiting mechanism A324 so that the wire limiting mechanism A324 restricts the movement of the wire in the feed channel A322, or releases the wire limiting mechanism A324 from restricting the movement of the wire.

[0153] In some embodiments, the wire limiting mechanism A324 cooperates with a limiting member located on the tool head A30, so that the wire limiting mechanism A324 is in a state of releasing the restriction on the wire. After the wire limiting mechanism A324 disengages from the limiting member, the wire limiting mechanism A324 is in a state of restricting the movement of the wire within the feed channel A322. In some embodiments, the wire limiting mechanism A324 cooperates with a limiting member located on the placement frame A40, so that the wire limiting mechanism A324 is in a state of restricting the movement of the wire within the feed channel A322. After the wire limiting mechanism A324 disengages from the limiting member, the wire limiting mechanism A324 is in a state of releasing the restriction on the wire.

[0154] In some embodiments, the wire limiting mechanism A324 may be a mechanical structure, moving by abutting against a limiting member to a position that releases the restriction on the wire or to a position that restricts the movement of the wire. In some embodiments, the wire limiting mechanism A324 may be an electrically driven structure, achieving circuit control by abutting against a limiting member to release the restriction on the wire or restrict the movement of the wire. Of course, the cooperation between the limiting member and the wire limiting mechanism A324 is not limited to contact; the limiting member can also trigger the wire limiting mechanism A324 without contact. For example, the limiting member may include a sensor to sense whether the wire limiting mechanism A324 is approaching or moving away, thereby restricting or releasing the restriction on the wire. For example, the wire limiting mechanism A324 may be equipped with a sensor to sense whether the limiting member is approaching or moving away, thereby restricting or releasing the restriction on the wire. For example, the limiting component and the wire limiting mechanism A324 cooperate through the magnetic field between the magnetic components, such as through the magnetic field force between the (electro)magnet, permanent magnet and magnetically conductive material, so that the limiting component and the wire limiting mechanism A324 cooperate.

[0155] The limiting component can be configured to cooperate with the wire limiting mechanism A324 so that the wire limiting mechanism A324 is in one of two states: either restricting the movement of the wire in the feeding channel A322 or releasing the restriction on the movement of the wire in the feeding channel A322.

[0156] Please refer to Figures 13, 14, 15, and 16. Figure 16 is a partial structural schematic diagram of the replaceable printhead A32 in the embodiment shown in Figure 13. The wire limiting mechanism A324 may include a movable limiting member 3241 and a resetting member 3242. The movable limiting member 3241 is movably connected to the replaceable printhead A32 and can move to a position that releases the restriction on the wire, or to a position that restricts the movement of the wire. The resetting member 3242 is disposed between the movable limiting member 3241 and the replaceable printhead A32, and is used to place the wire limiting mechanism A324 in a state that restricts the movement of the wire in the feed channel A322 or in a state that releases the restriction on the movement of the wire in the feed channel A322.

[0157] For example, the reset member 3242 is used when the movable limit member 3241 releases the restriction on the material line. For example, when the reset member A3242 releases the restriction on the material line under the action of the limit member A3241, the reset member 3242 applies a force to the movable limit member 3241 to restrict the movement of the material line. That is, the reset member A3242 can drive the movable limit member 3241 to move and restrict the movement of the material line.

[0158] For example, when the movable limiting member 3241 restricts the movement of the material line, the reset member 3242 restricts the movement of the material line under the action of the limiting member A3241. The reset member A3242 applies a force to the movable limiting member 3241 to release the restriction on the material line. That is, the reset member A3242 can drive the movable limiting member 3241 to move and release the restriction on the material line.

[0159] In some embodiments, the movable stop 3241 may have a cutting edge, tip, protrusion structure, or downwardly extending tooth-like, hook-like, or claw-like structure that can engage the wire to impede the movement of the wire when in contact with it.

[0160] Understandably, the active limit component 3241 is mainly used to effectively prevent the filament from retreating from the heating chamber due to shaking of the feed channel A322 or machine vibration when the replaceable print head A32 is idle, thus effectively avoiding head blockage or filament breakage.

[0161] In some scenarios, the filament can be conveyed within the feed channel A322, passing through the notch A3201, then the filament limiting mechanism A324, and subsequently entering the heating chamber. When the filament limiting mechanism A324 restricts the filament, the extrusion mechanism A33 does not compress the filament, nor does it affect the filament's fixation. This prevents the filament from retracting from the heating chamber due to lack of compression by the extrusion mechanism A33, thus reducing the risk of filament clogging the throat. It also allows for adjustment of the extrusion mechanism A33. Furthermore, the filament limiting mechanism A324 can restrict further filament entry into the heating chamber, thereby reducing the amount of filament entering the heating chamber and decreasing the amount of molten filament, thus reducing filament overflow. The effect of reducing the risk of clogging is even more significant when the 3D printer A100 is compatible with filaments of elastic materials (such as TPU (Thermoplastic polyurethanes)).

[0162] In some embodiments, the movable limiting member 3241 has a unidirectional conduction function. When the feed line moves from the inlet of the feed channel A322 of the replaceable printhead A32 towards the heating chamber side, the feed line can push the movable limiting member 3241 to move or rotate away from the feed line, thereby releasing the movable limiting member 3241 from restricting the movement of the feed line in the feed channel A322. When the feed line moves from the heating chamber side towards the inlet side of the feed channel A322, the movable limiting member 3241 can hold the feed line in place, thereby restricting the movement of the feed line. Furthermore, in some embodiments, the reset member 3242 may be omitted.

[0163] In some scenarios, the movable limiting member 3241 has an inclined surface or a curved surface facing the inlet side of the feed channel A322. The inclined surface or curved surface extends towards the heating chamber side along the feeding direction of the feed channel A322, and the extended end of the inclined surface or curved surface can engage the wire. When the wire moves from the inlet side of the feed channel A322 towards the heating chamber side, it can push the inclined surface or curved surface, thereby pushing the movable limiting member 3241 to move or rotate away from the wire. When the wire moves from the heating chamber side towards the inlet side of the feed channel A322, the extended end of the inclined surface or curved surface engages the wire, thereby restricting the movement of the wire.

[0164] In some embodiments, the reset member 3242 may be made of an elastic material and be capable of deforming to store elastic potential energy. Furthermore, in some embodiments, the reset member 3242 may also be referred to as an "elastic reset member".

[0165] Understandably, one end of the reset member 3242 can be connected to the movable limiting member 3241, so that the movable limiting member 3241, in its natural state when not cooperating with the limiting member, is in a state that restricts the movement of the material line within the feed channel A322, or in a state that releases the restriction on the movement of the material line. For example, the reset member 3242 drives the movable limiting member 3241 to move or rotate in the direction of engaging the material line, thereby securing the material line and preventing it from retracting. When the wire limiting mechanism A324 cooperates with the limiting member, the movable limiting member 3241 overcomes the force of the reset member 3242 and is in a state that releases the restriction on the material line. Alternatively, the reset member 3242 drives the movable limiting member 3241 to move or rotate in a direction away from the material line, thereby releasing the restriction on the material line. When the wire limiting mechanism A324 cooperates with the limiting member, the movable limiting member 3241 overcomes the force of the reset member 3242 and is in a state that secures the material line and prevents it from retracting.

[0166] In some embodiments, the reset member 3242 may provide power to the movable limit member 3241 based on a structure that can provide a power source, such as a magnetic member or a motor, so that the movable limit member 3241 can move.

[0167] In some embodiments, the wire limiting mechanism A324 can restrict the movement of the wire within the feed channel A322 when the replaceable printhead A32 is placed on the placement frame A40. That is, the movable limiting member 3241 can move to the position that restricts the feed channel A322, or move to the position that restricts the feed channel A322 under the reset force of the reset member 3242.

[0168] In some embodiments, the wire limiting mechanism A324 on the replaceable printhead A32 is configured to switch from a wire release state to a wire locking state under the action of the placement frame A40, or to switch from a wire locking state to a wire release state under the action of the tool head A30.

[0169] In some embodiments, the wire limiting mechanism A324 on the replaceable printhead A32 is configured to switch between a wire locking state and a wire releasing state.

[0170] For example, the wire limiting mechanism A324 can move between the locked wire position and the released wire position. When the wire moves from the insert tube A3221 side to the heating chamber side, the wire limiting mechanism A324 can switch from the locked wire state to the released wire state, and / or, when the wire moves from the heating chamber side towards the insert tube A3221 side, the wire limiting mechanism A324 is in the locked wire state.

[0171] In some embodiments, the wire limiting mechanism A324 may extend into the feed channel A322 through a structure such as a hole or slot on the replaceable printhead A32 that communicates with the feed channel A322, so as to contact the wire and restrict the movement of the wire.

[0172] In some embodiments, the wire limiting mechanism A324 is on the placement frame A40, and the wire limiting mechanism A324 is configured to: switch from a wire releasing state to a wire locking state under the action of the tool head A30, and / or, when the tool head A30 is disengaged from the placement frame A40, the wire limiting mechanism A324 is in the wire releasing state.

[0173] In some embodiments, the wire limiting mechanism A324 is configured to: lock the wire during the alignment process when the tool head A30 moves to the alignment position of the placement frame A40 or during the placement of the replaceable print head A32; and / or, the limiting member is configured to switch from the wire-locking state to the wire-releasing state during the process when the tool head A30 picks up the replaceable print head A32 or after the tool head A30 leaves the alignment position.

[0174] In some embodiments, the tool head A30 moves within a printing plane to perform printing. The placement rack A40 can be provided with multiple replacement printhead A32 placement positions, and the multiple replacement printheads A32 are arranged in one direction within the printing plane. Furthermore, when there are multiple feed tubes A501, it facilitates the arrangement of the feed tubes A501 and reduces interference, effectively preventing the replacement printheads A32 from shaking due to the pulling of the feed line. The tool head A30 can move to an alignment position to align the replacement printheads A32 on the tool head A30 with the replacement printhead A32 placement positions on the placement rack A40, or align the tool head A30 with the replacement printheads A32 on the placement rack A40 at the alignment position. This allows the tool head A30 to be placed on the placement rack A40 or to be loaded onto the placement rack A40 by the action of the tool head A30 or / or the placement rack A40.

[0175] Please refer to Figures 10, 11 and 12. The extrusion mechanism A33 may include at least one of the mating wheel A331 and the extrusion wheel A332.

[0176] The mating wheel A331 and the extrusion wheel A332 can extrude the material line. Furthermore, the interval between the mating wheel A331 and the extrusion wheel A332 can match the size of the material line, such as the wire diameter and material. When the material line is extruded by the mating wheel A331 and the extrusion wheel A332 to the replaceable print head A32, the feed line passes through or accommodates the material line.

[0177] In some embodiments, the mating wheel A331 and the extrusion wheel A332 may correspond to the notch A3201, thereby enabling the mating wheel A331 and the extrusion wheel A332 to be located on both sides of the notch A3201, so as to cooperate with the extrusion line at the notch A3201 to deliver the material to the replaceable printhead A32, such as the feed channel A322.

[0178] Please refer to Figure 9. The tool head A30 may be provided with an opening A301 opposite to the gap. The opening A301 is provided so that the material line is located within the gap at the opening A301, and the material line can be loaded into or taken out of the gap through the opening A301.

[0179] In some embodiments, the feed line can be inserted into the replaceable printhead A32 and positioned within the gap as the replaceable printhead A32 is installed on the mounting base A31. In a further embodiment, the replaceable printhead A32 may be provided with an opening A301 communicating with the interior, so that the feed line inserted into the replaceable printhead A32 is exposed at the opening A301 and can be positioned within the gap, where it is squeezed and conveyed by the mating wheel A331 and the extrusion wheel A332. In some embodiments, the opening A301 may be the notch A3201 in the above embodiments.

[0180] In some embodiments, opening A301 may be located on the loading and unloading path of the material line. That is, when the material line moves on the loading path, it needs to pass through opening A301 and be placed within the interval. Of course, when the material line is removed, the material line located within the interval can be moved and pass through opening A301.

[0181] In some embodiments, the opening A301 may be arranged along the axial direction of the mating wheel A331 or the extrusion wheel A332. After the gap between the mating wheel A331 and the extrusion wheel A332 is expanded to be greater than the diameter of the material line, the replaceable print head A32 may detach from the mounting base A31 along the direction of the opening A301 with the material line.

[0182] Please refer to Figures 10, 11, and 12. To achieve adjustable spacing to match wire dimensions such as wire diameter and material, the tool head A30, for example, the extrusion mechanism A33, may also include a spacing adjustment component A34. This component A34 can be connected to at least one of the mating wheel A331 and the extrusion wheel A332, thereby controlling the radial movement of at least one of them to adjust the spacing between them. For example, the spacing can be adjusted via the spacing adjustment component A34 to load or unload the wire. For instance, the spacing can be adjusted to match the wire dimensions such as wire diameter and material, extruding (e.g., clamping and pushing) the wire, thereby conveying it.

[0183] In some scenarios, when the wire limiting mechanism A324 restricts the wire, the extrusion mechanism A33 may not extrude the wire. In this case, the extrusion mechanism A33 can be adjusted, for example, by controlling at least one of the mating wheel A331 and the extrusion wheel A332 to move in the radial direction, thereby adjusting the interval between the mating wheel A331 and the extrusion wheel A332.

[0184] In some embodiments, to enable adjustable spacing, the tool head A30 may further include a drive member A35, which drives the mating wheel A331 and / or the extrusion wheel A332 to move relative to each other, for example, radially, to adjust the clamping gap (i.e., the spacing). For example, the spacing can be adjusted by the drive member A35 to load or unload the wire, or to match the wire size, such as wire diameter or material, so that the mating wheel A331 and the extrusion wheel A332 can further extrude the wire, thus conveying the wire. In some embodiments, the drive member A35 may be a motor, electric cylinder, hydraulic cylinder, or other power-providing components or structures known to those skilled in the art. In some embodiments, the drive member A35 may be driveably connected to the spacing adjustment assembly A34, thereby providing power to the spacing adjustment assembly A34 to achieve spacing adjustment.

[0185] Please refer to Figures 11, 12, and 17. Figure 17 is a partial structural diagram of the tool head A30 in some embodiments of the embodiment shown in Figure 12. The spacing adjustment assembly A34 may include a moving part A341, which is rotatably connected to the mounting base A31. To enable the spacing adjustment assembly A34 to adjust the spacing, an extrusion wheel A332 may be mounted on and rotatably connected to the moving part A341. Furthermore, when the moving part A341 moves, it can drive the extrusion wheel A332 to move together and move towards or away from the mating wheel A331 to adjust the spacing.

[0186] In some embodiments, the moving part A341 can be directly connected to the driving member A35 so that the driving member A35 can drive the moving part A341 to rotate, thereby causing the extrusion wheel A332 to move together toward or away from the mating wheel A331.

[0187] In some embodiments, the spacing adjustment assembly A34 may include a rotating portion A342. The rotating portion A342 is rotatably connected to the mounting base A31 and is capable of abutting against the moving portion A341. Furthermore, the rotating portion A342 is rotatable relative to the mounting base A31.

[0188] The rotating part A342 can be rotated relative to the mounting base A31 to push the moving part A341, so that the moving part A341 can rotate relative to the mounting base A31 and move, thereby adjusting the interval.

[0189] In some embodiments, the rotating part A342 may be connected to the driving member A35 for transmission so as to rotate under the drive of the driving member A35, thereby pushing the moving part A341 to move.

[0190] To enable the spacing adjustment assembly A34 to adjust the spacing, the rotating part A342 can rotate relative to the mounting base A31, further pushing the moving part A341. This allows the moving part A341 to rotate relative to the mounting base A31, thus moving it and driving the extrusion wheel A332 to move together, towards or away from the mating wheel A331, thereby achieving spacing adjustment. In other words, the rotating part A342 can change the relative position of the moving part A341 on the mounting base A31 by rotation, and can further drive the extrusion wheel A332 towards or away from the mating wheel A331.

[0191] In some embodiments, when the rotating part A342 is rotated to the first position, there is a first gap between the mating wheel A331 and the extrusion wheel A332. The mating wheel A331 and the extrusion wheel A332 cooperate to clamp the wire so that the wire can be extruded and conveyed from the first gap. In some embodiments, the first gap can be adjusted so that the mating wheel A331 and the extrusion wheel A332 can extrude different types of wire, thereby realizing the conveying of different types of wire. For example, the size of the first gap can be adjusted to suit wires with diameters of 1.75 mm or 2.85 mm.

[0192] In some embodiments, when the rotating part A342 is rotated to the second position, there is a second gap between the mating wheel A331 and the extrusion wheel A332, the second gap being larger than the first gap, and the feed line can be loaded and unloaded from the mounting base A31 through the opening A301.

[0193] In some embodiments, the rotating part A342 may have a first rotation axis and be able to rotate about the first rotation axis.

[0194] In order to enable the rotating part A342 to drive the moving part A341 to move by rotating, and further, during the rotation of the rotating part A342, the first movement distance from the contact point between the rotating part A342 and the moving part A341 to the first rotation axis is variable, or the second movement distance to the second rotation axis is variable, so that the change of the first movement distance or the second movement distance can be converted into the movement of the moving part A341.

[0195] In some embodiments, to achieve the change in the first operating distance, the rotating part A342 may be an eccentric wheel or other structure. In some embodiments, the rotating part A342 may be a gear or worm, and the moving part A341 is provided with a corresponding rack or worm, so that the change in the first operating distance or the second operating distance is achieved through the engagement and transmission. In some embodiments, the rotating part A342 and the moving part A341 can roll in contact, and the change in the contact position between the rotating part A342 and the moving part A341 drives the moving part A341 to move to achieve the change in the first operating distance or the second operating distance. It is understood that, to achieve the change in the second operating distance, the rotating part A342 may also be a rod-shaped structure or other structure.

[0196] It is understood that, in order to achieve the change of the first or second movement distance, the moving part A341 and the rotating part A342 may have other structures, and are not limited to the embodiments listed herein.

[0197] In some embodiments, the rotating part A342 is eccentrically positioned so that at least the first action distance is variable, thereby enabling the rotating part A342 to push the moving part A341 when rotating, so that the moving part A341 moves by rotating.

[0198] In some embodiments, the circumferential outer surface of the rotating part A342 may abut against the moving part A341. When the rotating part A342 rotates, different positions of the circumferential outer surface abut against the moving part A341, thereby causing the first action distance to change, which in turn can push the moving part A341.

[0199] To achieve the reset of the moving part A341, making the interval adjustable, and to facilitate operation such as placing the material line within the interval, the rotating part A342 can be movably connected to the moving part A341. Thus, when the rotating part A342 rotates, it can drive the moving part A341 to move. This causes the moving part A341 to move the extrusion wheel A332 closer to the mating wheel A331 to decrease the interval, or it can cause the moving part A341 to move the extrusion wheel A332 away from the mating wheel A331 to increase the interval.

[0200] The spacing adjustment assembly A34 may also include a first reset part A343, which may be disposed between the moving part A341 and the mounting base A31 to keep the moving part A341 in contact with the rotating part A342.

[0201] In some embodiments, the first reset portion A343 may include a first elastic portion.

[0202] The first reset part A343, for example, the first elastic part, can be provided between the moving part A341 and the mounting base A31, resetting the moving part A341 to a position abutting against the rotating part A342. For example, after the rotating part A342 pushes the moving part A341 to reduce the interval, the rotating part A342 rotates away from the moving part A341. The provision of the first reset part A343, for example, the first elastic part, causes the moving part A341 and the rotating part A342 to move accordingly and remain in abutting state, moving towards the side away from the mating wheel A331 to increase the interval.

[0203] The first reset part A343, for example, is provided with a first elastic part, which can push the moving part A341 around the swing center and move it away from the mating wheel A331 by the reset force.

[0204] In some embodiments, when the first reset part A343, for example the first elastic part, can ensure that the mating wheel A331 and the extrusion wheel A332 are engaged to extrude the material, the first reset part A343, for example the first elastic part, can push the moving part A341, causing the extrusion wheel A332 to move towards the side closer to the mating wheel A331. Furthermore, in some embodiments, the rotating part A342 may be omitted.

[0205] The first reset portion A343, for example, the first elastic portion, can generate a reset force based on deformation. In some embodiments, the first reset portion A343, for example, the first elastic portion, can be a torsion spring, a spring, or other structure made of an elastic material, which will not be described in detail.

[0206] The driving member A35 can directly or indirectly apply pressure to the moving part A341, so that the moving part A341 drives the extrusion wheel A332 closer to the mating wheel A331, thereby reducing the gap. At the same time, it can also cause the first reset part A343, for example, the first elastic part, to deform. Furthermore, when the driving member A35 does not apply pressure to the moving part A341, the first reset part A343, for example, the first elastic part, can be activated. Based on the deformation of the first reset part A343, for example, the first elastic part, a reset force is generated, which pushes the moving part A341 to move away from the mating wheel A331 around the swing center.

[0207] In some embodiments, the first reset part A343 may also include a magnetic element, such as the magnetic field force between a (electro)magnet, a permanent magnet and a magnetically conductive material, to keep the moving part A341 and the rotating part A342 in contact.

[0208] In some embodiments, the drive member A35 may be drively connected to the rotating part A342 to apply pressure to the moving part A341 via the rotating part A342. Of course, the drive member A35 may also act on the moving part A341 through other structures.

[0209] The drive unit A35 may include a rotary motor A351, which is capable of being drivenly connected to the rotating part A342.

[0210] In some embodiments, the mating wheel A331 can rotate to extrude the material line, and under the extrusion of the extrusion wheel A332, the material line is transmitted to the extrusion wheel A332, so that the extrusion wheel A332 moves accordingly, and then the material line is extruded under the cooperation of the mating wheel A331 and the extrusion wheel A332, thereby realizing the conveying of the material line.

[0211] For example, the mating wheel A331 and the extrusion wheel A332 achieve material conveying by meshing or rubbing against the surface of the material line.

[0212] Referring to Figure 9, the tool head A30, such as the drive unit A35, may also include a mating motor A353, which is drivenly connected to the mating wheel A331 so that the mating wheel A331 can extrude the material line with the extrusion wheel A332, extruding the material line to the replaceable print head A32. In some embodiments, the mating motor A353 may be mounted on the mounting base A31.

[0213] To allow the replaceable printhead A32 to be detached from the tool head A30 (e.g., mounting base A31), one of the replaceable printhead A32 (e.g., connector A321) and the tool head A30 (e.g., mounting base A31) is provided with a pin, hook, or magnet, while the other is provided with a corresponding slot, groove, or magnetic element. The pin, hook, or magnet is used to engage with the slot, groove, or magnetic element. Of course, the engagement of the replaceable printhead A32 (e.g., connector A321) and the tool head A30 (e.g., mounting base A31) can also be achieved through other detachable connection methods, which will not be elaborated upon here.

[0214] Please refer to Figures 10, 11, and 12 for the removal and installation of the replaceable printhead A32. The tool head A30 may also include an assembly component A36, which can adjust the position of the replaceable printhead A32 relative to the tool head A30, for example, the mounting base A31. For example, adjusting the position of the replaceable printhead A32 relative to the tool head A30, for example, the mounting base A31, to a mating position allows the replaceable printhead A32 to be installed on the tool head A30, for example, the mounting base A31. For example, adjusting the position of the replaceable printhead A32 relative to the tool head A30, for example, the mounting base A31, to an unlocked position allows the replaceable printhead A32 to be removed from the tool head A30, for example, the mounting base A31.

[0215] In some embodiments, a replaceable printhead A32, such as a connector A321, can be detached from the mounting base A31, for example, by means of an assembly assembly A36, or another replaceable printhead A32 can be mounted on the mounting base A31, for example, by means of an assembly assembly A36.

[0216] In some embodiments, the assembly component A36 can be driven by the drive component A35 to move the replaceable printhead A32 between an engaged position and an unlocked position, thereby enabling the replaceable printhead A32 to be removed from or installed on the tool head A30, such as the mounting base A31.

[0217] In some embodiments, the drive member A35 may be drively connected to the spacing adjustment component A34 and the assembly component A36, thereby enabling the drive member A35 to drive the spacing adjustment component A34 to move in order to adjust the spacing, and thereby enabling the drive member A35 to drive the assembly component A36 to move in order to remove or install the replaceable printhead A32 on the tool head A30, for example, the mounting base A31.

[0218] The drive component A35 can drive assembly component A36 and pitch adjustment component A34 simultaneously, or drive assembly component A36 and pitch adjustment component A34 sequentially.

[0219] In some embodiments, the drive member A35 can first drive the pitch adjustment component A34 to move, thereby increasing the pitch, for example, by making the pitch larger than the size of the feed line, allowing the feed line within the pitch to disengage from the clamp. Then, it drives the assembly component A36 to move, enabling the replaceable printhead A32 to switch from the mating position to the unlocked position along the assembly direction, thus disassembling the replaceable printhead A32. Alternatively, the drive member A35 can first drive the assembly component A36 to move, thereby switching the replaceable printhead A32 from the unlocked position to the mating position along the assembly direction, thus loading the replaceable printhead A32. Then, it drives the pitch adjustment component A34 to move, thereby decreasing the pitch, for example, by making the pitch decrease to be closer to the size of the feed line, allowing the feed line within the pitch to be squeezed by the extrusion wheel A332 and the mating wheel A331.

[0220] With this configuration, the drive component A35 can stagger the movement of the spacing adjustment component A34 and the assembly component A36 in a staggered manner. This can effectively prevent the feed line from remaining clamped during the process of the replaceable printhead A32 switching from the mating position to the unlocked position. This would prevent the feed line in the heating chamber of the replaceable printhead A32 from being pulled out and causing a blockage, or the feed line from obstructing the position switching process of the replaceable printhead A32.

[0221] To assemble the tool head A30, the replaceable printhead A32 can be placed on the assembly component A36. The assembly component A36 is driven by the drive component A35 to switch the replaceable printhead A32 from the unlocked position to the mating position, thus installing the replaceable printhead A32 on the tool head A30. Further, the feed line is positioned within the gap between the extrusion wheel A332 and the mating wheel A331. The gap is reduced by the drive component A35 driving the spacing adjustment component A34, and the feed line is then extruded by the extrusion wheel A332 and the mating wheel A331, completing the feed line installation. Alternatively, the replaceable printhead A32 can be placed in the mounting position of the tool head A30, and the assembly component A35 can be driven by the drive component A35 to switch the assembly component A36 from the unlocked position to the mating position, locking the replaceable printhead A32 in the mating position. Additionally, the feed line can also be positioned within the gap between the extrusion wheel A332 and the mating wheel A331 during the installation of the replaceable printhead A32.

[0222] To disassemble the tool head A30, the drive component A35 drives the pitch adjustment component A34 to increase the gap, for example, to a size larger than the material thread size, thus removing the material thread within the gap between the extrusion wheel A332 and the mating wheel A331. Further, the drive component A35 drives the assembly component A36, causing the replaceable print head A32 to switch from the mating position to the unlocked position, or vice versa, thereby allowing the replaceable print head A32 to be removed. Of course, the material thread within the gap between the extrusion wheel A332 and the mating wheel A331 can also be removed when removing the replaceable print head A32.

[0223] Understandably, the drive component A35 can be a power-providing element or structure that can be connected to the pitch adjustment component A34 and the assembly component A36 via a transmission mechanism, thereby driving the assembly component A36 and the pitch adjustment component A34 simultaneously or sequentially when providing power.

[0224] Of course, the drive unit A35 can also be two power-providing components or structures, one of which can provide power to the drive assembly A36 and the other can provide power to the pitch adjustment assembly A34.

[0225] For example, the drive unit A35 may include a rotary motor A351 and an assembly motor A352. The rotary motor A351 can drive the pitch adjustment component A34 to move, thereby increasing the pitch, for example, to a pitch larger than the thread size, allowing the thread within the pitch to disengage from the clamp. The assembly motor A352 can drive the assembly component A36 to move, enabling the replaceable printhead A32 to switch from a mating position to an unlocked position along the assembly direction, thus facilitating the removal of the replaceable printhead A32.

[0226] For example, the drive unit A35 may include a rotary motor A351 and an assembly motor A352. The assembly motor A352 can drive the assembly assembly A36 to move, so that the replaceable printhead A32 can be switched from the unlocked position to the mating position along the assembly direction, thereby loading the replaceable printhead A32. The rotary motor A351 can drive the pitch adjustment assembly A34 to move, so that the pitch decreases, for example, the pitch decreases towards the size of the feed line, so that the feed line within the pitch can be clamped by the extrusion wheel A332 and the mating wheel A331.

[0227] In some embodiments, the drive component A35, such as the rotary motor A351, can first drive the pitch adjustment component A34 to move, thereby increasing the pitch, for example, by making the pitch larger than the size of the wire, so that the wire within the pitch can be disengaged from the clamp. Then, the drive component A35, such as the assembly motor A352, can drive the assembly component A36 to move, thereby switching the replaceable printhead A32 from the mating position to the unlocked position along the assembly direction, thus enabling the disassembly of the replaceable printhead A32.

[0228] In some embodiments, the drive component A35, such as the assembly motor A352, can first drive the assembly assembly A36 to move, so that the replaceable printhead A32 switches from the unlocked position to the mating position along the assembly direction, thereby loading the replaceable printhead A32. Then, the drive component A35, such as the rotary motor A351, can drive the pitch adjustment component A34 to move, so that the pitch decreases, for example, the pitch decreases towards the size of the feed line, so that the feed line within the pitch is squeezed by the extrusion wheel A332 and the mating wheel A331.

[0229] In some embodiments, the assembly direction can be the height direction Z, the length direction X, or the width direction Y, etc.

[0230] In some embodiments, the assembly motor A352 may be omitted, and the assembly component A36 may be driven by the rotary motor A351, which is connected to the assembly component A36. Alternatively, the rotary motor A351 may be omitted, and the assembly motor A352 may be connected to the pitch adjustment component A34, which is connected to the pitch adjustment component A34.

[0231] It is understandable that the setting method of assembly component A36 and its cooperation method with other structures can also be referred to the setting method of spacing adjustment component A34 and its cooperation method with other structures. Correspondingly, the setting method of spacing adjustment component A34 and its cooperation method with other structures can also be referred to the setting method of assembly component A36 and its cooperation method with other structures, and will not be elaborated further.

[0232] Please refer to Figure 18, which is a partial structural schematic diagram of the tool head A30 in the embodiment shown in Figure 12. The assembly component A36 may include an assembly part A361, one end of which is connected to the replaceable print head A32. The drive component A35 may be driven by the assembly part A361 to drive its movement, thereby enabling it to move between a mating position and an unlocked position along the assembly direction, thus facilitating the loading and unloading of the replaceable print head A32. Alternatively, in other embodiments, the drive component A35 may directly drive the assembly part A361, thereby causing the replaceable print head A32 to move relative to the tool head A30 along the assembly direction between the mating position and the unlocked position.

[0233] It is understandable that the configuration of assembly A361 and its cooperation with other structures can also be referred to the configuration of moving part A341 and its cooperation with other structures. Correspondingly, the configuration of moving part A341 and its cooperation with other structures can also be referred to the configuration of assembly A361 and its cooperation with other structures, and will not be elaborated further.

[0234] In some embodiments, assembly A361 may be drivenly connected to assembly motor A352 so that assembly motor A352 drives assembly A361 to move. In some embodiments, rotary motor A351 may be drivenly connected to assembly A361 to drive assembly A361 to move.

[0235] In some embodiments, a replaceable printhead A32, such as a connector A321, can mate with an assembly component A36, such as an accessory A361, to achieve installation on a mounting base A31. In some embodiments, the connector A321 is detachably connected to the mounting base A31.

[0236] In some embodiments, the mounting accessory A361 is rotatable relative to the mounting base A31, enabling the mounting accessory A361 to move the replaceable printhead A32 between a mating position and an unlocked position. For example, the replaceable printhead A32 can move relative to the tool head A30 along the assembly direction between a mating position and an unlocked position.

[0237] To enable the drive component A35 to simultaneously or sequentially drive the assembly assembly A36 and the pitch adjustment assembly A34 via a power-providing element or structure, the assembly assembly A36 may further include an adjustment component A362. The adjustment component A362 can be driven by the assembly part A361 and the drive component A35, such as a rotary motor A351 or an assembly motor A352, respectively. This allows the drive component A35, such as a rotary motor A351 or an assembly motor A352, to be driven by the assembly part A361 via the adjustment component A362, thereby driving the assembly part A361 and further enabling it to move along the assembly direction between a mating position and an unlocked position. It also allows the replaceable printhead A32 to move relative to the tool head A30 along the assembly direction between a mating position and an unlocked position.

[0238] It is understandable that the setting method of the adjusting member A362 and its cooperation method with other structures can also be referred to the setting method of the rotating part A342 and its cooperation method with other structures, and correspondingly, the setting method of the adjusting member A362 and its cooperation method with other structures can also be referred to the setting method of the rotating part A342 and its cooperation method with other structures, and will not be described in detail.

[0239] Furthermore, the fitting and setting methods of assembly A361 and adjusting member A362 can also be found in the fitting and setting methods of moving part A341 and rotating part A342, and will not be elaborated further. Similarly, the fitting and setting methods of moving part A341 and rotating part A342 can also be found in the fitting and setting methods of assembly A361 and adjusting member A362, and will not be elaborated further.

[0240] Furthermore, the adjustment component A362 can be configured not only to enable the simultaneous or sequential driving of assembly component A36 and spacing adjustment component A34 using the same drive component A35, but also to change the transmission direction and method. Thus, the adjustment component A362 allows assembly motor A352 to be connected to assembly component A361 via the adjustment component A362. This further enables rotary motor A351 to be connected to spacing adjustment component A34.

[0241] Adjusting member A362 can be driven to assembly A361 and drive member A35, such as rotary motor A351 or assembly motor A352, respectively, so that drive member A35, such as rotary motor A351 or assembly motor A352, can be driven to assembly A361 through adjusting member A362.

[0242] In some embodiments, the adjusting member A362 may be mounted on the mounting base A31.

[0243] In some embodiments, the adjusting member A362 can move or rotate to cause the plug portion to slide along the assembly direction, so that the assembly part A361 can move between the mating position and the unlocked position. It can also cause the assembly part A361, for example the plug portion, to drive the replaceable print head A32 to move relative to the tool head A30, for example the mounting base A31, along the assembly direction between the mating position and the unlocked position.

[0244] In some embodiments, the adjusting member A362 can move the rotating part A3612 along the assembly direction by moving or rotating, so that the assembly part A361 can move between the mating position and the unlocked position. The rotating part A3612 can also drive the replaceable print head A32 to move relative to the tool head A30, such as the mounting base A31, along the assembly direction between the mating position and the unlocked position.

[0245] Adjusting member A362 may be provided with a first motion groove A3621, which extends along a first direction and along the assembly direction. The first motion groove A3621 has at least two positions with different heights, and the assembly part A361 is partially movably disposed within the first motion groove A3621. Driving member A35 drives adjusting member A362 to move along the first direction, causing different groove wall areas of the assembly part A361 to interact, so that the assembly part A361 moves along the groove wall of the first motion groove A3621, thereby driving the replaceable printhead A32 to move relative to the tool head A30.

[0246] The first motion groove A3621 allows the assembly A361 to move along the groove wall of the first motion groove A3621, thereby allowing it to be located at different heights, such as different heights along the assembly direction. This allows the assembly A361 to be in different positions based on different heights, enabling the assembly A361 to move between the mating position and the unlocked position based on height adjustment. It also allows the assembly A361 to drive the replaceable printhead A32 to move relative to the tool head A30 along the assembly direction between the mating position and the unlocked position.

[0247] It should be noted that the terms used to describe the height, top, bottom, etc. of the first motion groove A3621 are relative to the assembly direction and the first direction. The assembly direction can be the gravity direction or the height direction Z, or the length direction X or the width direction Y, etc. In some embodiments, the first direction intersects with the assembly direction, for example, the first direction is perpendicular to the assembly direction.

[0248] In some embodiments, the adjusting member A362 may further include a first rack portion A3622. The driving member A35, such as a rotary motor A351 or an assembly motor A352, drives the assembly part A361 to move along the extension direction of the first motion groove A3621.

[0249] The first rack portion A3622 can mesh with the drive wheel A363 and the drive member A35 for transmission. Thus, under the drive of the drive member A35, such as a rotary motor A351 or an assembly motor A352, the first rack portion A3622 can move along the extending direction of the first motion groove A3621. In some embodiments, the first rack portion A3622 can be slidably connected to the mounting base A31.

[0250] In some embodiments, the assembly component A36 may further include a drive wheel A363. The drive wheel A363 and the assembly component A361 are arranged along the extending direction of the first motion groove A3621. The drive wheel A363 may be driven by a drive member A35, such as a rotary motor A351 or an assembly motor A352. Furthermore, the drive member A35, such as a rotary motor A351 or an assembly motor A352, is driven by the drive wheel A363 to the adjusting member A362. In some embodiments, the drive wheel A363 may mesh with the adjusting member A362, such as a first rack portion A3622. Furthermore, under the drive of the drive member A35, such as a rotary motor A351 or an assembly motor A352, the adjusting member A362 is driven to move along the extending direction of the first motion groove A3621 by the engagement of the drive wheel A363 with the adjusting member A362, such as the first rack portion A3622.

[0251] In some embodiments, the first rack portion A3622 may be slidably connected to the mounting base A31. In some embodiments, the rotation axis of the drive wheel A363 may be perpendicular to the first direction. In a further embodiment, the drive wheel A363 may be a complete gear. In some embodiments, the rotation axis of the drive wheel A363 may be perpendicular to the first direction; for example, the drive wheel A363 may be a worm, and the first rack portion A3622 is provided with teeth that mesh with the worm.

[0252] In some embodiments, drive wheel A363 may be mounted on a first rotating shaft A344 to be rotatable about a first rotation axis. In some embodiments, drive wheel A363 may be drive-connected to a mounting motor A352.

[0253] In some embodiments, the drive wheel A363 may be a full gear, an incomplete gear, or a cam. In some embodiments, the adjusting member A362 may also be a lever structure.

[0254] In some embodiments, the tool head A30 can be detached from the replaceable print head A32 and attached to the holder A40 via the assembly assembly A36.

[0255] In some embodiments, the tool head A30 can load the replaceable print head A32 located on the placement rack A40 via the assembly assembly A36 and move the replaceable print head A32 so that the replaceable print head A32 leaves the placement rack A40.

[0256] This application also describes a mounting frame A40, which can be used in a 3D printer A100 to hold the replaceable print head A32 in the above embodiments. For example, in a scenario where the tool head A30 is equipped with the replaceable print head A32, the 3D printer A100 can place the replaceable print head A32 on the tool head A30 onto the mounting frame A40. For example, in a scenario where the replaceable print head A32 is placed on the mounting frame A40, the 3D printer A100 can load the replaceable print head A32 on the mounting frame A40 onto the tool head A30.

[0257] In some embodiments, during the process of placing the replaceable printhead A32 into the placement rack A40, the tool head A30 needs to move the replaceable printhead A32 to the alignment position of the placement rack A40, and then the 3D printer A100 can place the replaceable printhead A32 into the placement rack A40.

[0258] In some embodiments, during the loading of the replaceable printhead A32 located on the mounting frame A40, the tool head A30 needs to be moved to the alignment position of the mounting frame A40, and then the 3D printer A100 can load the replaceable printhead A32 on the mounting frame A40 onto the tool head A30.

[0259] In some embodiments, after the tool head A30 moves the replaceable print head A32 to the alignment position of the placement rack A40, the tool head A30 switches the replaceable print head A32 from the mating position to the unlocked position via the assembly component A36 and places it in the placement rack A40.

[0260] In some embodiments, after the tool head A30 moves to the alignment position of the placement frame A40, the tool head A30 switches the replaceable print head A32 on the placement frame A40 from the unlocked position to the mating position through the assembly component A36, and loads the replaceable print head A32 on the placement frame A40 onto the tool head A30.

[0261] In some embodiments, the placement and unlocking processes of the replaceable printhead A32 can be performed simultaneously, thereby reusing the unlocking process of the replaceable printhead A32 and simplifying the control actions and number of motion mechanisms of the 3D printer A100.

[0262] In some embodiments, the placement frame A40 can be moved to remove the replaceable printhead A32 from the tool head A30, thereby placing the replaceable printhead A32 on the placement frame A40. For example, in some embodiments, the placement frame A40 can be moved along the assembly direction to remove the replaceable printhead A32 from the tool head A30, thereby detaching the replaceable printhead A32 from the tool head A30 and placing the replaceable printhead A32 on the placement frame A40.

[0263] Please refer to Figures 19, 20, 21, and 22. Figure 19 is a structural schematic diagram of the placement rack A40 in some embodiments of the embodiment shown in Figure 8. Figure 20 is a structural schematic diagram of the placement rack A40 in other embodiments of the embodiment shown in Figure 8. Figure 21 is a structural schematic diagram of the placement rack A40 and tool head A30 during the loading or unloading of the replaceable printhead A32 in the embodiment shown in Figure 20. Figure 22 is a structural schematic diagram of the placement rack A40 and tool head A30 during the loading or unloading of the replaceable printhead A32 in the embodiment shown in Figure 20. The frame A41 can be used to support structures mounted on the placement rack A40, such as at least one positioning element A42, and of course, it can also support the replaceable printhead A32. The positioning element A42 can cooperate with the replaceable printhead A32 during the alignment or placement process to limit the replaceable printhead A32 in at least one direction, effectively fix the replaceable printhead A32, and realize the placement of the replaceable printhead A32.

[0264] The mounting frame A40, such as the frame A41, can be fixed to the body A10, or it can move relative to the body A10.

[0265] At least one positioning element A42 can be used with the replaceable printhead A32 through a structure design that achieves positioning by means of plug-in mating, position limiting, clamping and fixing, snap-fit ​​connection, magnetic mating or other separable and combinable means known to those skilled in the art, without further details.

[0266] In some embodiments, at least one positioning member A42 can limit the replaceable printhead A32 in at least one of the three directions: length direction X, width direction Y, and height direction Z, thereby effectively fixing the replaceable printhead A32.

[0267] In some embodiments, at least one positioning member A42 can limit the replaceable printhead A32 in at least one of three directions: alignment direction, movement direction, or assembly direction, and effectively fix the replaceable printhead A32.

[0268] In some embodiments, one of the three directions—length direction X, width direction Y, and height direction Z—can be an alignment direction, another can be a movement direction, and the last can be an assembly direction. It is understood that any one of the three directions—length direction X, width direction Y, and height direction Z—can simultaneously be an alignment direction and a movement direction, or an assembly direction and a movement direction.

[0269] In some embodiments, after the tool head A30 moves the replaceable print head A32 to the alignment position of the placement rack A40, the tool head A30 or the replaceable print head A32 is aligned with the alignment position of the placement rack A40 along the alignment direction. In some embodiments, after the tool head A30 moves to the alignment position of the placement rack A40, it is aligned with the alignment position of the placement rack A40 along the alignment direction. In some embodiments, the alignment direction may be located in the plane defined by the length direction X and the width direction Y. In some embodiments, the alignment direction may be the length direction X and / or the width direction Y, and of course, it may be other directions, which will not be elaborated further.

[0270] In some embodiments, the assembly direction may be the direction in which the tool head A30 is assembled with the replaceable print head A32. In some embodiments, the assembly direction may be the direction in which the assembly assembly A36 is assembled with the replaceable print head A32.

[0271] In some embodiments, the direction of movement may lie within the plane defined by the length direction X and the width direction Y. In some embodiments, the direction of movement may be the length direction X or the width direction Y, and of course, other directions may also be used, which will not be elaborated further. In some embodiments, the direction of movement may be perpendicular to the alignment direction; for example, the direction of movement may be the width direction Y, and the alignment direction may be the length direction X. In some embodiments, the direction of movement may be perpendicular to the assembly direction.

[0272] Understandably, the tool head A30 carrying the replaceable printhead A32 can be moved along the alignment direction to the alignment position of the placement rack A40, or moved to the alignment position of the placement rack A40, so that the tool head A30 or the replaceable printhead A32 can be aligned with the alignment position of the placement rack A40 along the alignment direction. Then, the replaceable printhead A32 is unlocked along the assembly direction and placed on the placement rack A40, so that the placement rack A40 can limit the replaceable printhead A32 in at least one direction by at least one positioning member A42, or it can limit the replaceable printhead A32 in three mutually perpendicular directions. For example, at least one of the three directions of length (X), width (Y), and height (Z) limits the replaceable printhead A32. For example, at least one of the three directions of alignment, movement, or assembly limits the replaceable printhead A32.

[0273] In some embodiments, the alignment direction is the width direction Y, the assembly direction is the gravity direction, and the movement direction is the length direction X.

[0274] In some embodiments, the positioning member A42 includes a first positioning member A421, which defines the degree of freedom of movement of the replaceable printhead A32 along the alignment direction.

[0275] In some embodiments, the positioning member A42 includes a second positioning member A422, which defines the degree of freedom of movement of the replaceable printhead A32 along the assembly direction.

[0276] In some embodiments, the positioning member A42 includes a third positioning member A423, which defines the degree of freedom of movement of the replaceable printhead A32 along the direction of activity.

[0277] Understandably, in some embodiments, the alignment direction is the width direction Y, the assembly direction is the gravity direction (i.e., the height direction), and the movement direction is the length direction X. The tool head A30 can move along the width direction Y to the alignment position of the placement frame A40, and then the 3D printer A100 places the replaceable print head A32 on the placement frame A40 along the gravity direction. In some embodiments, the positioning member A42 includes a first positioning member A421, which defines the degree of freedom of movement of the replaceable print head A32 along the width direction Y, and a second positioning member A422, which defines the degree of freedom of movement of the replaceable print head A32 along the gravity direction. Further, in some embodiments, the tool head A30 can move in the plane defined by the length direction X and the width direction Y for printing, and the positioning member A42 also includes a third positioning member A423, which defines the degree of freedom of movement of the replaceable print head A32 in the length direction X. Understandably, in some embodiments, the placement process of the replaceable printhead A32 includes a first positioning member A421 first restricting the degree of freedom of movement of the replaceable printhead A32 along the width direction Y, and then a second positioning member A422 restricting the degree of freedom of movement of the replaceable printhead A32 along the direction of gravity. In some embodiments, please refer to FIG. 25, which is a structural schematic diagram of the placement rack A40 in the embodiment shown in FIG. 19 in other embodiments. The third positioning member A423 includes a first sub-positioning member A4231, with two first sub-positioning members A4231 arranged at intervals along the length direction X, and the interval between the two first sub-positioning members A4231 is used to accommodate the replaceable printhead A32. In some embodiments, please refer to FIG. 19 and FIG. 25, the third positioning member A423 includes a second sub-positioning member A4232. Two second sub-positioning members A4232 are arranged at intervals along the length direction X, and the interval between the two second sub-positioning members A4232 is used to accommodate the replaceable printhead A32.

[0278] Understandably, in some embodiments, the alignment direction is the width direction Y, and the assembly direction is the length direction X. The tool head A30 moves within the plane defined by the length direction X and the width direction Y to perform printing. The tool head A30 can move along the width direction Y to the alignment position of the placement frame A40, and then the 3D printer A100 places the replaceable print head A32 along the length direction X on the placement frame A40. In some embodiments, the positioning member A42 includes a first positioning member A421, which defines the degree of freedom of movement of the replaceable print head A32 along the width direction Y, and a second positioning member A422, which defines the degree of freedom of movement of the replaceable print head A32 along the length direction X. Understandably, in some embodiments, the placement process of the replaceable print head A32 includes the first positioning member A421 first restricting the degree of freedom of movement of the replaceable print head A32 along the width direction Y, and then the second positioning member A422 restricting the degree of freedom of movement of the replaceable print head A32 along the length direction X.

[0279] Understandably, in some embodiments, the alignment direction is the direction of gravity, the assembly direction is the width direction Y, and the movement direction is the length direction X. The tool head A30 moves within the plane defined by the length direction X and the width direction Y to perform printing. The tool head A30 and / or the placement frame A40 can move along the direction of gravity so that the tool head A30 is positioned in the aligned position of the placement frame A40. Subsequently, the 3D printer A100 places the replaceable print head A32 on the placement frame A40 along the width direction Y. In some embodiments, the positioning member A42 includes a first positioning member A421, which defines the degree of freedom of movement of the replaceable print head A32 along the direction of gravity, and a second positioning member A422, which defines the degree of freedom of movement of the replaceable print head A32 along the width direction Y. Further, in some embodiments, the positioning member A42 also includes a third positioning member A423, which defines the degree of freedom of movement of the replaceable print head A32 in the length direction X. Understandably, in some embodiments, the placement process of the replaceable printhead A32 includes a first positioning member A421 first restricting the degree of freedom of movement of the replaceable printhead A32 along the direction of gravity, and then a second positioning member A422 restricting the degree of freedom of movement of the replaceable printhead A32 along the width direction Y. In some embodiments, referring to FIG25, the third positioning member A423 includes a first sub-positioning member A4231. Two first sub-positioning members A4231 are arranged at intervals along the length direction X, and the interval between the two first sub-positioning members A4231 is used to accommodate the replaceable printhead A32. In some embodiments, referring to FIGS19 and 25, the third positioning member A423 includes a second sub-positioning member A4232. Two second sub-positioning members A4232 are arranged at intervals along the length direction X, and the interval between the two second sub-positioning members A4232 is used to accommodate the replaceable printhead A32.

[0280] Understandably, in some embodiments, the alignment direction is the direction of gravity, and the assembly direction is the length direction X. The tool head A30 moves or extends within the plane defined by the direction of gravity and the length direction X for printing. The tool head A30 and / or the placement frame A40 can move along the direction of gravity so that the tool head A30 is positioned in the alignment position of the placement frame A40. Subsequently, the 3D printer A100 places the replaceable print head A32 on the placement frame A40 along the length direction X. In some embodiments, the positioning member A42 includes a first positioning member A421, which defines the degree of freedom of movement of the replaceable print head A32 along the direction of gravity, and a second positioning member A422, which defines the degree of freedom of movement of the replaceable print head A32 along the length direction X. Understandably, in some embodiments, the placement process of the replaceable printhead A32 includes a first positioning member A421 first restricting the degree of freedom of movement of the replaceable printhead A32 along the direction of gravity, and then a second positioning member A422 restricting the degree of freedom of movement of the replaceable printhead A32 along the length direction X.

[0281] In some embodiments, the tool head A30 is capable of moving the replaceable print head A32 along the alignment direction to the alignment position of the placement frame A40. In a further embodiment, the 3D printer A100, for example, the assembly component A36, unlocks the replaceable print head A32, such that the replaceable print head A32 is placed on the placement frame A40. In some embodiments, the tool head A30, for example, the assembly component A36, is capable of switching the replaceable print head A32 from the mating position to the unlocked position along the assembly direction and placing it on the placement frame A40. It is understood that in some embodiments, the placement process is performed simultaneously with the unlocking process of the replaceable print head A32, thus reusing the unlocking process of the replaceable print head A32 and simplifying the control actions and the number of motion mechanisms.

[0282] In some embodiments, the tool head A30 is capable of moving the replaceable print head A32 along the alignment direction to the alignment position of the placement frame A40. In a further embodiment, the 3D printer A100, for example, the placement frame A40, is movable such that the replaceable print head A32 is placed on the placement frame A40. In some embodiments, the placement frame A40 is capable of engaging with the replaceable print head A32 in an unlocked state, and by movement of the tool head A30 and / or the placement frame A40, the replaceable print head A32 is detached from the tool head A30 and placed on the placement frame A40.

[0283] In some embodiments, similar to the foregoing embodiments, both the tool head A30 and the placement rack A40 are movable, and they work together to remove the replaceable print head A32 from the tool head A30 and place it on the placement rack A40, which will not be described in detail here.

[0284] In some embodiments, the tool head A30 is configured to move the replaceable print head A32 to the alignment position of the placement frame A40 along the alignment direction. In some embodiments, after the tool head A30 moves the replaceable print head A32 to the alignment position of the placement frame A40, the 3D printer A100 places the replaceable print head A32 on the placement frame A40, and / or the tool head A30 picks up the replaceable print head A32 from the placement frame A40 and continues printing after leaving the alignment position.

[0285] In some embodiments, after the tool head A30 is configured to move the replaceable print head A32 to the alignment position of the placement rack A40, the 3D printer A100 places the replaceable print head A32 on the placement rack A40.

[0286] In some embodiments, after the replaceable printhead A32 is placed on the mounting bracket A40, the replaceable printhead A32 is not yet completely misaligned from the tool head A30. For example, the replaceable printhead A32 is mounted on the tool head A30 along the length direction X. In the assembled state or after the replaceable printhead A32 is placed on the mounting bracket A40, the projections of the tool head A30 and the replaceable printhead A32 along the width direction Y still overlap, which restricts the movement of the tool head A30, for example, restricting the tool head A30 from moving along the width direction Y, so that the tool head A30 can only move along the alignment direction. After the tool head A30 moves along the alignment direction, so that the distance between the tool head A30 and the mounting bracket A40 reaches a preset value, the replaceable printhead A32 and the tool head A30 are completely misaligned, which allows the replaceable printhead A32 to detach from the tool head A30. This releases the restriction on the movement of the tool head A30 in the printing plane, allowing the tool head A30 to continue moving in the printing plane.

[0287] After the tool head A30 is set to move the replaceable print head A32 along the alignment direction to the alignment position of the placement frame A40, the 3D printer A100 switches the replaceable print head A32 from the mating position to the unlocked position along the assembly direction and places it on the placement frame A40.

[0288] Referring to Figures 19 and 25, at least one positioning element A42 may include a first positioning element A421. The first positioning element A421 may be disposed on the mounting frame A40 and used to cooperate with the replaceable printhead A32 to limit the position of the replaceable printhead A32, and may also be used for mounting the replaceable printhead A32 on the mounting frame A40, such as the frame A41.

[0289] In some embodiments, the positioning member A42 may include a first positioning member A421, which limits the degree of freedom of movement of the replaceable printhead A32 along the alignment direction, thereby limiting the replaceable printhead A32 along the alignment direction. In some embodiments, the replaceable printhead A32 may be provided with a hook, and the first positioning member A421 may be provided with a slot; alternatively, the assembly portion of the replaceable printhead A32, such as the first assembly portion A3251, may be provided with a slot, and the first positioning member A421 may be a hook. Furthermore, the hook can be placed within the slot, achieving a limiting engagement between the first positioning member A421 and the replaceable printhead A32, such as the first assembly portion A3251. In some embodiments, the slot may also be provided on the frame A41, engaging with the first assembly portion A3251 of the replaceable printhead A32, such as the hook. In some embodiments, the first assembly portion A3251 of the replaceable printhead A32 may be a pin, and the first positioning member A421 may be provided with a slot; alternatively, the replaceable printhead A32, for example, the first assembly portion A3251, may be provided with a slot, and the first positioning member A421 may be a pin. Furthermore, the pin can be placed within the slot to achieve a limiting engagement between the first positioning member A421 and the replaceable printhead A32, for example, the first assembly portion A3251. In some embodiments, the slot may also be provided on the frame A41 to engage with the pin of the replaceable printhead A32, for example, the first assembly portion A3251.

[0290] In some embodiments, the replaceable printhead A32, such as the first assembly part A3251, may be provided with a magnetic element (i.e., a magnetic force element), and the first positioning member A421 may be a magnetic element. The magnetic elements are then attracted to each other through the magnetic field between them, achieving connection and further enabling the first positioning member A421 to limit the positioning of the replaceable printhead A32, such as the first assembly part A3251. In some embodiments, the magnetic element may be a magnet, such as an electromagnet, a permanent magnet, or a structure made of a magnetically conductive material.

[0291] Referring to Figures 19 and 25, the positioning member A42 may include a second positioning member A422, which is capable of defining the degree of freedom of movement of the replaceable printhead A32 along the assembly direction. In some embodiments, the second positioning member A422 is also capable of defining the degree of freedom of movement of the replaceable printhead A32 along the activity direction.

[0292] In some embodiments, the assembly portion of the replaceable printhead A32, such as the second assembly portion A3252, may be provided with a hook, and the second positioning member A422 may be provided with a slot; alternatively, the assembly portion of the replaceable printhead A32, such as the second assembly portion A3252, may be provided with a slot, and the second positioning member A422 may be a hook. Furthermore, the hook can be placed within the slot, achieving a limiting engagement between the second positioning member A422 and the assembly portion of the replaceable printhead A32, such as the second assembly portion A3252. In some embodiments, the slot may also be provided on the frame A41, engaging with the second assembly portion A3252 of the replaceable printhead A32, such as the hook. In some embodiments, the replaceable printhead A32, such as the second assembly portion A3252, may be provided with a pin, and the second positioning member A422 may be provided with a slot; alternatively, the replaceable printhead A32, such as the second assembly portion A3252, may be provided with a slot, and the second positioning member A422 may be a pin. Furthermore, the pin can be placed within the slot to achieve a limiting engagement between the second positioning member A422 and the replaceable printhead A32, such as the second assembly part A3252. In some embodiments, the slot may also be provided on the frame A41 to engage with the pin of the replaceable printhead A32, such as the second assembly part A3252.

[0293] In some embodiments, one of the replaceable printhead A32, such as the second assembly portion A3252, and the second positioning member A422 may be provided with a magnetic element, and the other may be provided with a magnet. The magnetic field between the magnetic element and the magnet attracts the printhead, achieving connection and further enabling the second positioning member A422 to limit the movement of the replaceable printhead A32, such as the second assembly portion A3252. It is understood that the magnet can be a permanent magnet or electromagnet that provides the magnetic field, and the magnetic element can be a magnet or other object that can be attracted by a magnetic field.

[0294] Please refer to Figures 21, 22, 23, and 24. Figure 23 is an exploded view of the placement frame A40 in some embodiments of the embodiment shown in Figure 21, and Figure 24 is an exploded view of the placement frame A40 in some embodiments of the embodiment shown in Figure 21. During the movement of the tool head A30 to the alignment position, the second positioning member A422 can move to make way for the replaceable print head A32, thereby not limiting the replaceable print head A32 and achieving the effect of releasing the degree of freedom of movement of the replaceable print head A32 along the assembly direction. In some embodiments, after the 3D printer A100 places the replaceable print head A32 on the placement frame A40, the second positioning member A422, under the action of the power member 424, limits the degree of freedom of movement of the replaceable print head A32 along the assembly direction. That is, the second positioning member A422 is driven by the tool head A30 and overcomes the force of the power member 424, so that the second positioning member A422 moves to a position that releases the degree of freedom of movement of the replaceable print head A32 along the assembly direction, or the power member 424 actively drives the second positioning member A422 to a position that releases the degree of freedom of movement of the replaceable print head A32 along the assembly direction, or the power member 424 actively drives the second positioning member A422 to a position that limits the replaceable print head A32.

[0295] In some embodiments, the second positioning member A422 can move from a position that releases the replaceable printhead A32's degree of freedom of movement along the assembly direction to a position that limits the replaceable printhead A32, or it can move from a position that limits the replaceable printhead A32 to a position that releases the replaceable printhead A32's degree of freedom of movement along the assembly direction.

[0296] In some embodiments, the placement rack A40 may further include a power member 424 that provides a locking force to move the second positioning member A422 toward locking the replaceable printhead A32. By receiving an activity signal, the power member 424 drives the second positioning member A422 to move, thereby switching between restricting the degree of freedom of movement of the replaceable printhead A32 along the assembly direction and releasing the degree of freedom of movement of the replaceable printhead A32 along the assembly direction.

[0297] In some embodiments, the power member 424 may be at least one of an elastic member, an electromagnetic member, a magnetic member, or an electric drive device, and drives the second positioning member A422 to move by directly driving the second positioning member A422 or by being connected to the second positioning member A422 in a transmission manner.

[0298] In some embodiments, the second positioning member A422 may have an abutment portion A4221. The abutment portion A4221 engages or disengages with the replaceable printhead A32 or the tool head A30 to lock or unlock the replaceable printhead A32. In some embodiments, the tool head A30 or the replaceable printhead A32 has a trigger portion that engages with the abutment portion A4221 as the tool head A30 approaches the placement holder A40. The trigger portion pushes the abutment portion A4221 and overcomes the locking force provided by the power member 424 as the tool head A30 moves toward the placement holder A40, thereby moving the second positioning member A422 to make way for the replaceable printhead A32. This allows the replaceable printhead A32 to move to the alignment position and releases the replaceable printhead A32's freedom of movement along the assembly direction. This ensures that the second positioning member A422 does not obstruct the movement of the tool head A30 or the replaceable printhead A32 during the process of the tool head A30 moving the replaceable printhead A32 to the alignment position of the placement holder A40. The engagement between the triggering part and the contacting part A4221 can be a continuous, gradual engagement or a one-time trigger engagement, etc. This application does not limit the engagement method.

[0299] In some embodiments, when the tool head A30 moves the replaceable printhead A32 to the alignment position and switches the replaceable printhead A32 from the mating position to the unlocked position along the assembly direction, the tool head A30 leaves the placement rack A40 along the alignment direction. The trigger part and the abutment part A4221 disengage, causing the power member A424 to release the locking force on the second positioning member A422. This causes the second positioning member A422 to move in the direction of locking the replaceable printhead A32, thereby restricting the degree of freedom of the replaceable printhead A32 in the assembly direction. Through the cooperation of the abutment part 4221, the trigger part, and the power member A424, the tool head A30 is not interfered with by the second positioning member A422 during the alignment process of moving the replaceable printhead A32 to the alignment position. When the tool head A30 places the replaceable printhead A32 on the placement rack A40 and leaves the placement rack A40 along the alignment direction, the second positioning member A422 can move to the position where the replaceable printhead A32 is limited under the drive of the power member.

[0300] The triggering part overcoming and releasing the locking force of the power member A424 can take various forms, and this application is not limited thereto. In some embodiments, the second positioning member A422 can move relative to the placement frame A40, and the triggering part cooperates with the abutment part A4221. The power member A424 is a compression spring and is disposed between the second positioning member A422 and the frame A41. In some embodiments, the frame A41 is connected to the fixing member A426, and the fixing member A426 can be fitted with a compression spring, such that one end of the compression spring abuts against the fixing member A426 and the other end abuts against the second positioning member A422. Thus, driven by the compression spring, the second positioning member A422 moves relative to the placement frame A40. By compressing the spring during the movement of the second positioning member A422, the spring can provide a locking force for the second positioning member A422 to move in the direction of locking the replaceable printhead A32. After the tool head A30 or the replaceable printhead A32 disengages from the abutment part A4221, the spring can drive the abutment part A4221 to move the second positioning member A4222 in the direction of locking the replaceable printhead A32, thereby restricting the degree of freedom of the replaceable printhead A32 in the assembly direction.

[0301] In some embodiments, the placement rack A40 has a receiving area for accommodating the fixing member A426 and the moved second positioning member A422 and power member 424, so that the second positioning member A422 makes way for the tool head A30 and the replaceable print head A32, which is beneficial to making full use of the internal space of the placement rack A40 and to miniaturizing the whole machine and making it neat in appearance.

[0302] In some embodiments, the placement rack A40 is provided with a mounting plate A425 at the position corresponding to the receiving area, and the fastener A426, the second positioning member A422, and the power member 424 are installed in the receiving area by disassembly. The mounting plate A425 is used to block the opening of the receiving area, and the second positioning member A422 can also be inserted through a perforation to make way for the second positioning member A422.

[0303] In some embodiments, the 3D printer A100 has an opening A1001 to connect the interior of the 3D printer A100 with the outside. Users can adjust or repair internal structures such as the mounting frame A40 and tool head A30 through the opening A1001. The mounting frame A40 is also provided with an unlocking part A4223, with the side of the mounting frame A40 having the unlocking part A4223 facing the opening A1001 of the 3D printer A100. Users can adjust the second positioning member A422 through the opening A1001, overcoming the locking force provided by the power member A424, allowing the second positioning member A422 to move and releasing the restriction on the degree of freedom of the replaceable print head A32 in the assembly direction. This allows users to manually remove the replaceable print head A32 from the mounting frame A40, facilitating adjustments and maintenance.

[0304] In some embodiments, the power component A424 is a compression spring, and the second positioning component A422 is provided with an unlocking part A4223. The user can move the second positioning component A4222 by pulling the unlocking part A4223, moving it in a direction that releases the degree of freedom of the replaceable printhead A32 in the assembly direction. By activating the second positioning component A422 to compress the compression spring, the spring provides a locking force to the second positioning component A422 in the direction of locking the replaceable printhead A32. When the user releases the force applied to the unlocking part A4223, the spring can drive the second positioning component A422 to move in the direction of locking the replaceable printhead A32, thereby restricting the degree of freedom of the replaceable printhead A32 in the assembly direction. By providing an unlocking part A4223 that can be manually released from locking the replaceable printhead A32, the flexibility of adjusting or repairing the 3D printer A100 is increased. Furthermore, by positioning the unlocking part A4223 on the side of the mounting bracket A40 facing the opening A1001, the convenience of adjustment or repair for the user is increased.

[0305] In some embodiments, the second positioning member A422 is further provided with a limiting portion A4222 to cooperate with the assembly portion 325, such as the third assembly portion A3254, to limit the degree of freedom of the replaceable printhead A32 in the assembly direction. In some embodiments, the limiting portion A4222 may be a plug-in post, and the assembly portion 325, such as the third assembly portion A3254, is provided with a plug-in hole to achieve limiting when the plug-in post is inserted into the plug-in hole.

[0306] In some embodiments, the positioning member A42 includes a third positioning member A423, which can define the degree of freedom of movement of the replaceable printhead A32 along the direction of activity.

[0307] In some embodiments, referring to FIG25, the third positioning member A423 includes a first sub-positioning member A4231. Two first sub-positioning members A4231 are arranged at a distance along the length direction X, and the distance between the two first sub-positioning members A4231 is used to accommodate a replaceable printhead A32. In some embodiments, the third positioning member A423 includes a second sub-positioning member A4232. Two second sub-positioning members A4232 are arranged at a distance along the length direction X, and the distance between the two second sub-positioning members A4232 is used to accommodate a replaceable printhead A32. In some embodiments, the third positioning member A423 may be connected to the first positioning member A421, or the third positioning member A423 may also be referred to as the second positioning member A422, or the second positioning member A422 may also be referred to as the third positioning member A423.

[0308] Furthermore, in a further embodiment, the placement rack A40 may also include a power component that cooperates with the third positioning member A423. The cooperation method between the third positioning member A423 and the power component is similar to the cooperation method between the second positioning member A422 and the power component, and will not be described in detail here. In some embodiments, the second positioning member A422 and the third positioning member A423 may be driven by the power component A424.

[0309] Please refer to Figures 25, 26, 27, and 28. Figure 26 is a partially enlarged view of the placement frame A40 and replaceable printhead A32 in the embodiment shown in Figure 25. Figure 27 is a schematic diagram of the placement frame A40 and replaceable printhead A32 in the embodiment shown in Figure 25. Figure 28 is a partially enlarged schematic diagram of the placement frame A40 and replaceable printhead A32 in the embodiment shown in Figure 27. Regarding the replaceable printhead A32 and the second positioning member A422, the surface of the second mounting portion A3252 of the replaceable printhead A32, for example, the magnetic element facing the second positioning member A422, is located near the sealing assembly A43 and extends along the assembly direction, tilting towards the side near the placement frame A40. Conversely, the surface of the second mounting portion A3252 of the second positioning member A422, for example, the magnetic element facing the replaceable printhead A32, is located away from the sealing assembly A43, extends along the assembly direction, and tilts towards the side near the tool head A30. Furthermore, during the alignment or placement of the replaceable printhead A32, the magnetic field lines of the magnet are tilted and offset relative to the magnetic element, resulting in a smaller attraction. This attraction only increases when the replaceable printhead A32 is in or about to be in the mating position, at which point the magnetic field lines are closer to the magnetic element, thus making the placement of the replaceable printhead A32 less susceptible to interference from the magnet. In other words, the overall extending plane of the surface of any magnetic element forms an angle with the assembly direction. The overall extending plane of the magnet is the fitting plane of the surface facing the magnet, representing the approximate direction of the surface as a whole. It is perpendicular to the normal of the surface and can be obtained by using the least squares method, edge line fitting, etc., to find the ideal plane passing through the average position of each point on the surface. For example, for a plane, the fitting plane is the plane itself; for a curved surface, the fitting plane can be the line connecting the two edges of the curved surface as a reference, extending into a plane; the same applies to uneven or walled surfaces, which will not be elaborated further here.

[0310] In some embodiments, in the second positioning member A422 and the second assembly part A3252, the surface of at least one of the two magnetic elements includes two magnetic regions with opposite polarities. This ensures a strong magnetic force while reducing the divergence range of the magnetic lines of force, thereby reducing the influence of the magnet on the placement process and making it less likely to cause placement deviation.

[0311] In some embodiments, in the second positioning member A422 and the second assembly part A3252, the surface of at least one of the two magnetic elements includes two magnetic regions, which are arranged toward the assembly direction, so that in the mating state, the magnetic attraction along the assembly direction is greater and the positioning is more stable.

[0312] In some embodiments, in the second positioning member A422 and the second assembly part A3252, the inclined angle α of the overall extension plane of at least one of the two magnetic elements relative to the assembly direction ranges from 5° to 90°. Of course, the inclined angle α can also range from 10°, 20°, 30°, 40°, 50°, 60°, 70° or 80°.

[0313] In some embodiments, in the second positioning member A422 and the second assembly part A3252, the overall extension plane of the surface of at least one of the two magnetic elements has an inclination angle α relative to the assembly direction ranging from 15° to 40°. Of course, the inclination angle α can also be 16°, 18°, 25°, 28°, 35°, or 38°, etc.

[0314] In some embodiments, in the second positioning member A422 and the second assembly part A3252, the angle α of the overall extension plane of the surface of at least one of the two magnetic elements relative to the assembly direction ranges from 60°-70° or 35°-55° or 25°-50° or 30°-70° or 22°-40° or 45°-65°, etc.

[0315] In some implementations, the replaceable printhead A32 may not include the drive unit 35, thus enabling weight reduction. However, this weight reduction also makes the replaceable printhead A32 more prone to wobbling, thus requiring at least one positioning unit A42 for omnidirectional restraint.

[0316] In some implementations, the replaceable printhead A32 may not include the matching motor A353, thus enabling weight reduction. However, this weight reduction also makes the replaceable printhead A32 more prone to wobbling, thus requiring at least one positioning element A42 for omnidirectional restraint.

[0317] Referring to Figure 25, the 3D printer A100 may include a blocking assembly A43. The blocking assembly A43 is capable of engaging with the replaceable printhead A32 during placement to block the outlet of the nozzle A3223 at least partially during placement.

[0318] Please refer to Figures 19, 20 and 21. The sealing assembly A43 is positioned along the alignment direction on the path of the tool head A30, and blocks the nozzle outlet as the replaceable print head A32 moves along the alignment direction.

[0319] In some embodiments, the sealing component A43 is disposed on the placement frame A40. The sealing component A43 is provided with a first alignment portion A4313, and the replaceable printhead A32 is provided with a second alignment portion A3253. The first alignment portion A4313 and the second alignment portion A3253 cooperate with each other during placement, thereby enabling the sealing component A43 and the replaceable printhead A32 to move synchronously when in a blocked state. By moving the sealing component A43 and the replaceable printhead A32 synchronously, the force between the sealing component A43 and the nozzle of the replaceable printhead A32 can be made more stable, thereby avoiding excessive resistance to the movement of the tool head A30 or the placement frame A40 during placement, and preventing the moving mechanism from jamming or the nozzle blocking force from being too large. In addition, the follow-up sealing component A43 can also seal the nozzle A3223 in a timely manner, reducing material leakage from the nozzle A3223 during the alignment or placement process.

[0320] In some embodiments, the first alignment portion A4313 may also serve as a positioning element, such as a fourth positioning element. The first alignment portion A4313 is provided such that the placement frame A40 can adjust the position of the replaceable printhead A32 relative to the positioning element A42, and the placement frame A40 can drive the first alignment portion A4313 to move along the assembly direction so that the first alignment portion A4313 engages with the replaceable printhead A32 and limits the degree of freedom of movement of the replaceable printhead A32 along the assembly direction.

[0321] In some embodiments, the sealing component A43 may have a body 431 to seal the nozzle A3223. In some embodiments, the sealing component A43, for example, the body 431, may include a sealing portion A4311 and a scraper A4312. During the alignment process of the replaceable printhead A32 moving to the alignment position or during the placement of the replaceable printhead A32, the scraper A4312 wipes the nozzle A3223 of the replaceable printhead A32. The sealing portion A4311 blocks the outlet of the nozzle A3223 after the replaceable printhead A32 moves to the placement position to prevent material leakage from the nozzle A3223. It is understood that the replaceable printhead A32 heats the feed line to melt it for printing. During the replacement or placement of the replaceable printhead A32, the 3D printer A100 stops extruding the feed line. At this time, some melted printing material may leak from the nozzle A3223. If it is not cleaned or the nozzle outlet is not sealed, the leaked material will adhere to the vicinity of the nozzle A3223, which will affect the quality of subsequent printing.

[0322] In some embodiments, the body A431 may be movably connected to the frame 41 to make way for the replaceable printhead A32 when it is placed on the placement rack A40, while also blocking the nozzle A3223.

[0323] In some embodiments, the scraper A4312 first wipes the nozzle of the replaceable printhead A32, and then the sealing part A4311 blocks the nozzle outlet. In some embodiments, the scraper A4312 can wipe the nozzle of the replaceable printhead A32 during the process of the tool head A30 removing the replaceable printhead A32 and disengaging from the placement holder A40 in the alignment direction.

[0324] In some embodiments, during the alignment or placement process, the scraper A4312 may deform or move, with the highest point of the scraper A4312 positioned above or level with the nozzle tip along the assembly direction, so as to achieve scraping of the nozzle tip during the movement of the scraper A4312 relative to the replaceable printhead A32.

[0325] In some embodiments, along the assembly direction, the highest point of the scraper A4312 is higher than the highest point of the sealing portion A4311. This allows the scraping area to be larger than the clogging area, thereby cleaning the nozzle more effectively.

[0326] In some embodiments, the hardness of the scraper material A4312 is higher than the hardness of the sealing material A4311.

[0327] In some embodiments, the scraper A4312 is made of metal, and the sealing part A4311 is made of a flexible material. In some embodiments, the scraper A4312 and the sealing part A4311 are integrally formed or made of the same material, but the hardness of the scraper A4312 is higher than that of the sealing part A4311.

[0328] In some embodiments, the scraper A4312 includes a shielding surface A4315 that contacts the nozzle A3223. Along the alignment direction, the height of the shielding surface A4315 gradually increases as the replaceable printhead A32 approaches the placement holder A40. The closer the shielding surface A4315 is to the alignment position, the higher its height, thereby gradually increasing the pressure on the nozzle A3223 during the alignment or placement process, facilitating the scraping of material from the nozzle orifice.

[0329] In some embodiments, the blocking component A43 is disposed on the placement frame A40, the blocking component A43 is provided with a first alignment part A4313, and the replaceable printhead A32 is provided with a second alignment part A3253. The first alignment part A4313 and the second alignment part A3253 cooperate with each other during the alignment process or placement process, thereby enabling the blocking component A43 and the replaceable printhead A32 to move synchronously when in the blocked state.

[0330] In some embodiments, a first alignment portion A4313 is disposed on the body A431; both the first alignment portion A4313 and the body A431 are made of thermally conductive material. A second alignment portion A3253 is disposed on the heat sink A322. Through the cooperation of the first alignment portion A4313 and the second alignment portion A3253, heat from the heat sink A322 is conducted to the body A431, aiding in heat dissipation and preventing the replaceable printhead A32 from becoming clogged due to overheating of the throat A3222 when it is not in operation.

[0331] In some embodiments, the throat A3222 and the heat sink A3225 are connected by adhesive / interference / thread. When the connection is made only through the throat A3222, there are only two dimensional chains. Therefore, by providing the second alignment part A3253 on the heat sink A3225, and by aligning and cooperating the second alignment part A3253 with the first alignment part A4313, it is easy to control the tolerance.

[0332] In some embodiments, the placement rack A40 includes a movement groove A401 extending along the assembly direction, a first alignment portion A4313 being a pin passing through the movement groove A401, and a second alignment portion A3253 being a slot for aligning and engaging with the pin, or...

[0333] In some embodiments, the placement rack A40 includes a movement groove A401 extending in the assembly direction, a first alignment portion A4313 being a slot, the opening of the slot at least partially coinciding with the opening of the movement groove A401, and a second alignment portion A3253 being a pin for alignment and engagement with the slot.

[0334] Please refer to Figure 24. The sealing component A43 is disposed on the placement frame A40. The sealing component A43 includes a first elastic part A432 and a sealing part A4311 for contacting and blocking the nozzle outlet. One end of the first elastic part A432 is connected to the sealing part A4311. During placement, the sealing part A4311 moves synchronously with the replaceable printhead A32, causing the first elastic part A432 to be compressed or stretched along the assembly direction during placement, so that the elastic restoring force provided by the first elastic part A432 to the replaceable printhead A32 increases synchronously with the movement of the replaceable printhead A32.

[0335] In some embodiments, the scraper A4312 may be a spring, which is used to contact and block the nozzle outlet. The scraper A4312 is made of an elastic material, and its elastic coefficient is greater than that of the first elastic part A432. Understandably, the scraper A4312 achieves contact through movement relative to the replaceable printhead A32, thus overcoming greater resistance and achieving a better nozzle-clogging effect. The return spring has a smaller elastic coefficient because it only needs to drive the sealing assembly A43 to overcome gravity and achieve reset. Setting the return spring's elastic coefficient to a smaller value also reduces resistance during placement.

[0336] In some embodiments, the scraper A4312, such as a spring, is used to contact and block the nozzle outlet. During the alignment or placement process, the highest point of the scraper A4312, such as the spring, in the assembly direction is higher than or flush with the lowest point of the nozzle outlet in the mating position.

[0337] In some embodiments, the scraper A4312, for example, is made of metal. This helps dissipate heat from the nozzle, thereby allowing the printing material near the nozzle to cool down more quickly and reducing ink leakage.

[0338] In some embodiments, the scraper A4312, such as a spring, includes a shielding surface A4315 that contacts the nozzle. The shielding surface A4315 forms an angle with the replaceable printhead A32 in the alignment direction of the replaceable printhead A32 near the mounting bracket A40, and the height of the shielding surface A4315 gradually increases as the replaceable printhead A32 approaches the alignment position. The contact point of the shielding surface A4315 gradually increases as the replaceable printhead A32 approaches the alignment position, gradually increasing the pressure on the nozzle A3223, facilitating the scraping off of material from the nozzle orifice.

[0339] Please refer to Figures 26, 27 and 29. Figure 29 is a partially enlarged view of the embodiment shown in Figure 27 when the placement rack A40 and the replaceable printhead A32 are engaged.

[0340] The sealing assembly A43 may include a second elastic portion A4314, which is made of elastic material. The second elastic portion A4314 is used to contact and block the nozzle outlet. Along the direction of the tool head A30 toward the holder A40, a scraper A4312, such as a spring, is disposed between the second elastic portion A4314 and the nozzle outlet. When the replaceable print head A32 is in the unlocked position, the highest point of the second elastic portion A4314 in the assembly direction is higher than or flush with the lowest point of the nozzle outlet in the unlocked position.

[0341] In some embodiments, the second elastic part A4314 is a rubber component.

[0342] The second elastic part A4314 can be provided on the main body A431 and can also function as the sealing part A4311.

[0343] In some embodiments, a limiting member is provided on the placement rack A40. The limiting member is configured to cause the wire limiting mechanism A324 to switch from a wire release state to a wire locking state when the replaceable printhead A32 reaches the alignment position or during the placement of the replaceable printhead A32. And / or, the limiting member is configured to cause the wire limiting mechanism A324 to switch from a wire locking state to a wire release state during the process of the tool head A30 picking up the replaceable printhead A32 or after the replaceable printhead A32 leaves the alignment position.

[0344] In some embodiments, the wire limiting mechanism A324 switches between a wire release state and a wire locking state by moving or rotating.

[0345] In some embodiments, the wire limiting mechanism A324 is disposed on the placement frame A40. The wire limiting mechanism A324 is configured to switch from a wire releasing state to a wire locking state under the action of the tool head A30, and / or, when the tool head A30 is disengaged from the placement frame A40, the wire limiting mechanism A324 is in the wire releasing state.

[0346] The wire limiting mechanism A324 is configured to lock the wire when the tool head A30 moves to the alignment position of the placement rack A40 or during the placement of the replaceable print head A32, and / or the wire limiting mechanism A324 is configured to switch from the wire-locking state to the wire-releasing state during the process of the tool head A30 picking up the replaceable print head A32 or after the tool head A30 is disengaged from the alignment position.

[0347] In some embodiments, the replaceable printhead A32 includes a signal element A371 and a detection element A372, which cooperate to detect whether the replaceable printhead A32 is placed in the correct position.

[0348] Please refer to Figure 30, which is a structural schematic diagram of the replaceable printhead A32 in some embodiments of the embodiment shown in Figure 13. A signal element A371 is provided on the tool head A30. When the replaceable printhead A32 moves to the alignment position of the placement rack A40 or is in the placement position, the placement rack A40 is provided with a detection element A372 corresponding to the signal element A371. The placement rack A40 has multiple placement positions for the replaceable printhead A32. The detection element A372 is used to detect the signal when the replaceable printhead A32 signal element A371 generates a signal, in order to determine whether the replaceable printhead A32 is in place or in the corresponding placement position. It is understood that the replaceable printhead A32 on the placement rack A40 can be manually removed for maintenance or replacement. When it is put back, it may be placed in the wrong position. Therefore, it is necessary to detect the placement position of the replaceable printhead A32 to avoid such errors. When the removed replaceable printhead A32 is not the intended printhead, it will cause malfunctions such as incorrect use of feed line in the canceled printhead, heating errors, or feed tube entanglement.

[0349] In some embodiments, a heating element A3224 is provided on the replaceable print head A32. The heating element A3224 is connected to the 3D printer A100 via a wiring harness to obtain heating current. The signal element A371 is a wiring harness, and the detection element A372 is an inductive sensor.

[0350] In some embodiments, the signal element A371 is a light source, and the detection element A372 is a photoelectric sensor.

[0351] In some embodiments, the signal element A371 is a coil or electromagnet, and the detection element A372 is a Hall sensor.

[0352] Understandably, when the replaceable printhead A32 is correctly placed, the corresponding signal element A371 on the placement rack A40 can receive the signal when the replaceable printhead A32 sends a signal, thus determining that the placement position is correct. For example, if the replaceable printhead A32A is placed in placement position a, when the signal element A371 of the replaceable printhead A32A sends a signal, such as powering the wiring harness, turning on the light source, or energizing the coil, the detection element A372 corresponding to placement position a can detect the signal, thus determining that the placement position of the replaceable printhead A32A is correct. If the replaceable printhead A32A is incorrectly placed in placement position b, then when the signal element A371 of the replaceable printhead A32A sends a signal, such as powering the wiring harness, turning on the light source, or energizing the coil, the detection element A372 corresponding to placement position a cannot detect the signal, thus determining that the placement position is incorrect.

[0353] In some embodiments, the signal element A371 is a wiring harness, and the heating element is connected to the 3D printer A100 via the wiring harness to obtain heating current. A detection element A372 is provided on the placement frame A40 to detect the signal generated by the signal element A371 of the replaceable print head A32, thereby determining whether the replaceable print head A32 is properly positioned or in the corresponding placement position. In some embodiments, the signal element A371 on the replaceable print head A32 can be a wiring harness, and the detection element A372 on the placement frame A40 can be an inductor, Hall effect detector, current sensor, or other similar components. The wiring harness supplies heating current to the heating element, and the detection element A372 can detect whether the replaceable print head A32 is properly positioned or in the corresponding placement position.

[0354] In some embodiments, by pre-energizing the replaceable printhead A32 to be used, it is preheated. During the preheating process, the wiring harness generates a signal, which is identified by the detection element A372. This allows it to determine whether the replaceable printhead A32 being used matches the preheated printhead. This reuse of the preheating process and the detection of the placement of the replaceable printhead A32 simplifies the control logic.

[0355] In some embodiments, the signal element A371 is disposed on the side of the replaceable printhead A32 away from the notch A3201 and facing the placement frame A40, and when the replaceable printhead A32 moves to the alignment position of the placement frame A40 or is in the placement position, the signal element A371 is disposed correspondingly to the detection element A372 on the placement frame A40.

[0356] In some embodiments, the signal element A371, in conjunction with the detection element A372, can also be used to determine whether the replaceable printhead A32 is properly positioned. By processing the signal acquired by the detection element A372 during the placement process, the position of the signal element A371 on the replaceable printhead A32 can be determined. For example, the signal element A371 can be a magnet, and the detection element A372 can be a Hall sensor. By judging the signal strength of the Hall sensor, the position of the signal element A371 on the replaceable printhead A32 can be determined. Alternatively, the signal element A371 can be a light source, and the detection element A372 can be a photoelectric sensor. By judging the signal strength of the photoelectric signal, the position of the signal element A371 on the replaceable printhead A32 can be determined. The detection principles of other signal elements A371 and detection elements A372 are similar and will not be described further.

[0357] Please refer to Figure 31, which is a partial structural schematic diagram of the 3D printer A100 in some embodiments of this application. The control method for the 3D printer A100 includes:

[0358] 3D printer A100 includes a tool head A30 equipped with a replaceable print head A32. The replaceable print head A32 includes a heating chamber and a nozzle. The heating chamber heats the filament into a molten state and outputs it through the nozzle to a heated bed for layer-by-layer printing in the height direction. Replacing the tool head A30 with the replaceable print head A32 includes:

[0359] The placement rack A40 lowers the replaceable printhead A32 along the height direction so that the replaceable printhead A32 is aligned with the unlocked position on the tool head A30;

[0360] During or before the placement rack A40 descends, control the heated bed to descend a preset distance.

[0361] In some embodiments, when the printing height is between 0-20mm, the tool head A30 controls the heated bed to descend a preset distance when replacing the replaceable print head A32. In the early stages of printing, the replaceable print head A32 is prone to colliding with protruding parts of the heated bed or printing panel, such as the wiping nozzle area, the flushing area, and the marking area.

[0362] In some embodiments, the placement rack A40 includes a blocking assembly A43 for cooperating with the replaceable printhead A32 during placement to block the nozzle exit during at least partial placement. Understandably, due to the presence of the blocking assembly A43, the lowest position of the replaceable printhead A32 on the placement rack A40 corresponding to the placement rack A40 is lower than the lowest position of the nozzle of the replaceable printhead A32 on the tool head A30. Therefore, without lowering the heated bed, the placement rack A40 will collide with the heated bed or print panel after descent.

[0363] In some embodiments, the control method for the 3D printer A100 includes:

[0364] 3D printer A100 includes a tool head A30 equipped with a replaceable print head A32. The replaceable print head A32 includes a heating chamber and a nozzle. The heating chamber heats the filament into a molten state and outputs it through the nozzle to a heated bed for layer-by-layer printing in the height direction. Replacing the tool head A30 with the replaceable print head A32 includes:

[0365] The placement rack A40 lowers the replaceable printhead A32 along the height direction so that the replaceable printhead A32 is aligned with the unlocked position on the tool head A30;

[0366] During or before the placement rack A40 descends, control the heated bed to descend a preset distance.

[0367] In some embodiments, when the printing height is between 0-20mm, the tool head A30 controls the heated bed to descend a preset distance when replacing the replaceable print head A32. In the early stages of printing, the replaceable print head A32 is prone to colliding with protruding parts of the heated bed printing panel, such as the wiping nozzle area, the flushing area, and the marking area.

[0368] In some embodiments, the placement rack A40 includes a blocking assembly A43 for cooperating with the replaceable printhead A32 during placement to block the nozzle exit during at least partial placement. Understandably, due to the presence of the blocking assembly A43, the lowest position of the replaceable printhead A32 on the placement rack A40 corresponding to the placement rack A40 is lower than the lowest position of the nozzle of the replaceable printhead A32 on the tool head A30. Therefore, without lowering the heated bed, the placement rack A40 will collide with the heated bed or print panel after descent.

[0369] In some embodiments, as shown in Figure 31, the shelf 40 is positioned at a higher level to reduce obstruction of the door panel 1002 side, facilitating operation and observation.

[0370] When printing the first layer on the A100 3D printer, due to the downward unlocking of the replaceable print head A32 and the thickness of the sealing component A43, it is necessary to control the heated bed to descend before replacing the replaceable print head A32 in the early layers to avoid interference during the replacement process. After replacement, the heated bed should be returned to the height for the next printing. This operation is required for at least the initial 6mm height range.

Claims

1. A mounting rack for use in a 3D printer including a tool head, characterized in that, The tool head is configured to move the replaceable print head to the alignment position of the placement frame, after which the 3D printer places the replaceable print head on the placement frame; the placement frame includes a frame body and at least one positioning member, the positioning member being used to cooperate with the replaceable print head during the placement process to limit the replaceable print head in at least one direction.

2. The placement rack according to claim 1, characterized in that, The tool head is configured such that after the replaceable print head is moved along the alignment direction to the alignment position of the placement frame, the 3D printer switches the replaceable print head from the mating position to the unlocked position along the assembly direction and places it on the placement frame.

3. The placement rack according to claim 2, characterized in that, The tool head further includes a drive unit and an assembly assembly, the assembly assembly being configured to adjust the position of the replaceable printhead relative to the tool head. The placement process of the replaceable printhead includes: the drive unit being configured to drive the assembly assembly to move, causing the replaceable printhead to switch from a mating position to an unlocked position along the assembly direction; and / or The placement frame is configured to adjust the position of the replaceable printhead relative to the positioning member. The placement process of the replaceable printhead includes: the placement frame driving the positioning member to move along the assembly direction so that the positioning member engages with the replaceable printhead and limits the degree of freedom of movement of the replaceable printhead.

4. The placement rack according to claim 3, characterized in that, The tool head can move within a printing plane to perform printing; after the 3D printer places the replaceable print head on the mounting frame, the mounting frame and / or the tool head move relative to each other along an alignment direction; After the distance between the tool head and the placement frame along the alignment direction reaches a preset value, the replaceable print head releases the restriction on the movement of the tool head within the printing plane.

5. The placement rack according to claim 4, characterized in that, The positioning element includes a first positioning element, which is used to limit the degree of freedom of movement of the replaceable printhead along the alignment direction.

6. The placement rack according to claim 5, characterized in that, The replaceable printhead and the first positioning component can be either a hook or a slot that engages with the hook; or, either a pin or a slot that engages with the pin; or, either a magnet or an electromagnet or a magnetic element.

7. The placement rack according to claim 5, characterized in that, The positioning element includes a third positioning element, which limits the degree of freedom of movement of the replaceable printhead along the active direction, the active direction being perpendicular to the alignment direction and the assembly direction.

8. The placement rack according to claim 7, characterized in that, The third positioning element includes at least two first sub-positioning parts, which are arranged at intervals along the direction of movement, and the interval between the two first sub-positioning parts is used to accommodate the replaceable printhead.

9. The placement rack according to claim 4, characterized in that, The positioning element includes a first positioning element and a second positioning element. The first positioning element is used to limit the degree of freedom of movement of the replaceable printhead along the alignment direction, and the second positioning element is used to limit the degree of freedom of movement of the replaceable printhead along the assembly direction. The placement process of the replaceable printhead includes the first positioning element first limiting the degree of freedom of movement of the replaceable printhead along the alignment direction, and then the second positioning element limiting the degree of freedom of movement of the replaceable printhead along the assembly direction.

10. The placement rack according to claim 9, characterized in that, One of the replaceable printhead and the second positioning component can be a hook, and the other can be a slot that engages with the hook; or, one of the replaceable printhead and the second positioning component can be a pin, and the other can be a slot that engages with the pin; or, one of the replaceable printhead and the second positioning component can be a magnet, and the other can be a magnetic element.

11. The placement rack according to claim 10, characterized in that, During the process of the tool head moving to the alignment position, the second positioning member moves to release the degree of freedom of movement of the replaceable print head along the assembly direction; after the 3D printer places the replaceable print head on the placement frame, the second positioning member limits the degree of freedom of movement of the replaceable print head along the assembly direction under the action of the power member.

12. The placement rack according to claim 11, characterized in that, The power component is at least one of an elastic component, an electromagnetic component, a magnetic component, and an electric drive device; during the process of the tool head moving to the alignment position, the second positioning component moves to release the degree of freedom of movement of the replaceable print head along the assembly direction, including: the second positioning component is driven by the tool head and overcomes the force of the power component, so that the second positioning component moves to a position that releases the degree of freedom of movement of the replaceable print head along the assembly direction, or the power component actively drives the second positioning component to move to a position that releases the degree of freedom of movement of the replaceable print head along the assembly direction.

13. The placement rack according to claim 10, characterized in that, The replaceable printhead and the second positioning element can be either a magnet or a magnetic element. The magnet is tilted away from the assembly direction from the surface of the magnetic element, and the surface of the magnetic element is tilted towards the magnet.

14. The placement rack according to claim 13, characterized in that, The overall extending plane of the magnet toward the surface of the magnetic element forms an angle with the assembly direction.

15. The placement rack according to claim 13, characterized in that, The side of the magnet facing the magnetic element includes two magnetic regions with opposite polarities.

16. The placement rack according to claim 15, characterized in that, The two magnetic regions are arranged facing the assembly direction.

17. The placement rack according to claim 13, characterized in that, The angle of inclination of the integral extension plane of the magnet and the magnetic element relative to the assembly direction is the same.

18. The placement rack according to claim 13, characterized in that, The angle between the overall extension plane of the magnet and magnetic element and the assembly direction is in the range of 5°-90°.

19. The placement rack according to claim 18, characterized in that, The angle between the overall extension plane of the magnet and magnetic element and the assembly direction is in the range of 15°-40°.

20. The placement rack according to claim 13, characterized in that, The tool head further includes a mating motor and an extrusion mechanism, the extrusion mechanism including at least one of a mating wheel, an extrusion wheel, or a spacing adjustment assembly; the mating motor is driven to the mating wheel so that the mating wheel feeds the feed line into the heating chamber of the replaceable printhead, and / or, the drive unit is used to drive the spacing adjustment assembly to move so that the extrusion wheel moves relative to the mating wheel, thereby adjusting the spacing between the extrusion wheel and the mating wheel; wherein, the replaceable printhead does not include the drive unit and the mating motor.

21. The placement rack according to claim 20, characterized in that, The positioning component includes a limiting part, which is used for the degree of freedom of movement of the replaceable printhead along the assembly direction; the replaceable printhead has a feeding channel and a notch, the feed line enters the heating chamber through the feeding channel, the notch for exposing the feed line is provided in the middle of the feeding channel, and the limiting part contacts the portions of the replaceable printhead located on both sides of the notch respectively.

22. The placement rack according to claim 21, characterized in that, The replaceable printhead is also connected to a feed tube, one end of which is connected to the feed channel and the other end of which is connected to the feeding mechanism to deliver the material line to the replaceable printhead; the tool head can move in a printing plane to perform printing, and the placement frame has multiple replaceable printhead placement positions, with the multiple replaceable printheads arranged in one direction in the printing plane.

23. A 3D printer, characterized in that, include: A replaceable printhead includes a heating chamber and a nozzle, wherein the heating chamber is used to heat the feed line into a molten state and output the printed material through the nozzle; A placement rack for holding the replaceable printhead; The tool head is configured to move the replaceable print head to the alignment position of the placement frame, and then the 3D printer places the replaceable print head on the placement frame. A blocking assembly is used to cooperate with the replaceable printhead during placement to block the nozzle outlet at least partially during placement.

24. The 3D printer according to claim 23, characterized in that, The sealing assembly includes a scraper and a sealing part. During the process of the replaceable printhead moving to the alignment position, the scraper wipes the nozzle of the replaceable printhead, and the sealing part blocks the outlet of the nozzle after the replaceable printhead moves to the placement position to prevent the nozzle from leaking material.

25. The 3D printer according to claim 24, characterized in that, The scraping component first wipes the nozzle of the replaceable printhead, and then the sealing part blocks the nozzle outlet.

26. The 3D printer according to claim 24, characterized in that, The placement process for the replaceable printhead includes: The 3D printer switches the replaceable printhead from the mating position to the unlocked position along the assembly direction and places it on the placement rack; along the assembly direction, the highest point of the scraper is higher than or level with the height of the nozzle tip; and / or, along the assembly direction, the highest point of the scraper is higher than the highest point of the sealing part; and / or, the hardness of the scraper material is higher than the hardness of the sealing part material; and / or, the scraper material is metal, and the sealing part is a flexible material.

27. The 3D printer according to claim 26, characterized in that, The tool head is configured such that after the replaceable print head is moved along the alignment direction to the alignment position of the placement frame, the 3D printer switches the replaceable print head from the mating position to the unlocked position along the assembly direction and places it on the placement frame. The scraper includes a shielding surface that contacts the nozzle, and the height of the shielding surface gradually increases along the alignment direction as the replaceable printhead approaches the side of the mounting frame.

28. The 3D printer according to claim 23, characterized in that, The placement process for the replaceable printhead includes: The 3D printer switches the replaceable printhead from the mating position to the unlocked position along the assembly direction and places it on the placement frame; the sealing component is disposed on the placement frame or the tool head, and during at least part of the movement of the replaceable printhead from the mating position to the unlocked position, the sealing component is configured to block the nozzle outlet.

29. The 3D printer according to claim 28, characterized in that, The tool head is configured to move the replaceable printhead to the alignment position of the placement rack along the alignment direction, and the sealing assembly is disposed along the path of the tool head along the alignment direction to block the nozzle outlet as the replaceable printhead moves along the alignment direction.

30. The 3D printer according to claim 28, characterized in that, The blocking component is disposed on the placement frame. The blocking component is provided with a first alignment part, and the replaceable printhead is provided with a second alignment part. The first alignment part and the second alignment part cooperate with each other during the placement process, thereby enabling the blocking component and the replaceable printhead to move synchronously when in a blocked state.

31. The 3D printer according to claim 30, characterized in that, The replaceable printhead also includes a heat sink and a throat tube. The heat sink is used to dissipate heat from the throat tube, and the throat tube is located between the heat sink and the heating chamber. The second alignment portion is disposed on the heat sink.

32. The 3D printer according to claim 30, characterized in that, The sealing assembly includes a body, and the first alignment portion is disposed on the body; the first alignment portion and the body are made of thermally conductive materials.

33. The 3D printer according to claim 30, characterized in that, The sealing assembly includes a body, with the first alignment portion disposed on the body; the placement frame includes a movement groove extending along the assembly direction, the first alignment portion being a pin inserted into the movement groove, and the second alignment portion being a slot for alignment and engagement with the pin; or, the placement frame includes a movement groove extending along the assembly direction, the first alignment portion being a slot, the opening of the slot at least partially coinciding with the opening of the movement groove, and the second alignment portion being a pin for alignment and engagement with the slot.

34. The 3D printer according to claim 30, characterized in that, The blocking assembly is disposed on the placement frame. The blocking assembly includes a blocking part and a first elastic part. The blocking part is used to contact and block the nozzle outlet. One end of the first elastic part is connected to the blocking part. The blocking part moves synchronously with the replaceable printhead during the placement process, causing the first elastic part to be compressed or stretched along the assembly direction during the placement process, so that the elastic restoring force provided by the first elastic part to the replaceable printhead increases synchronously with the movement of the replaceable printhead.

35. The 3D printer according to claim 34, characterized in that, The sealing part includes a body and a spring sheet. The spring sheet is used to contact the nozzle outlet and block the nozzle outlet. The spring sheet is made of elastic material and the elastic coefficient of the spring sheet is greater than that of the first elastic part.

36. The 3D printer according to claim 34, characterized in that, The sealing part includes a body and a spring piece. The spring piece is used to contact and block the nozzle outlet. The highest point of the spring piece in the assembly direction is higher than or flush with the lowest point of the nozzle outlet in the unlocked position.

37. The 3D printer according to claim 36, characterized in that, The spring is made of metal.

38. The 3D printer according to claim 36, characterized in that, The spring includes a shielding surface that contacts the nozzle. The shielding surface and the orthographic projection of the replaceable printhead onto the plane in the direction of the replaceable printhead approaching the placement frame form an angle, and the height of the shielding surface gradually increases as the replaceable printhead approaches the placement frame.

39. The 3D printer according to claim 36, characterized in that, The sealing part includes a second elastic part, which is made of elastic material. The second elastic part is used to contact and block the nozzle outlet. Along the direction of the tool head approaching the placement frame, the spring is disposed between the second elastic part and the nozzle outlet. When the replaceable printhead is in the unlocked position, the highest point of the second elastic part in the assembly direction is higher than or flush with the lowest point of the nozzle outlet in the unlocked position.

40. The 3D printer according to claim 39, characterized in that, The second elastic part is a rubber component.

41. A replaceable printhead, characterized in that, The replaceable printhead is detachably mounted on the tool head mounting base during the printing process, and placed on the placement rack after being separated from the mounting base; the replaceable printhead includes: a feeding channel and a heating chamber, through which the feed line enters the heating chamber; and a wire limiting mechanism for restricting the movement of the feed line in the feeding channel when the replaceable printhead is placed on the placement rack.

42. The replaceable printhead according to claim 41, characterized in that, When the tool head and the replaceable print head cooperate to perform a printing task, the wire limiting mechanism is in a state of releasing the restriction on the wire.

43. The replaceable printhead according to claim 42, characterized in that, A limiting member is also provided on the tool head or the placement rack. The limiting member is used to cooperate with the wire limiting mechanism so that the wire limiting mechanism restricts the movement of the wire in the feeding channel, or releases the wire limiting mechanism from restricting the movement of the wire.

44. The replaceable printhead according to claim 43, characterized in that, The wire limiting mechanism includes a movable limiting member and a resetting member. The limiting member cooperates with the wire limiting mechanism to either restrict the movement of the wire in the feeding channel or release the restriction on the movement of the wire in the feeding channel. The resetting member, when the limiting member is released from cooperation with the wire limiting mechanism, causes the wire limiting mechanism to either restrict the movement of the wire in the feeding channel or release the restriction on the movement of the wire in the feeding channel.

45. The replaceable printhead according to claim 44, characterized in that, The movable limiting member includes a limiting structure, which is disposed at the end of the movable limiting member. The limiting structure is a cutting edge, tip, protrusion that can engage the wire, or a toothed, hooked, or claw-shaped structure that extends downward.

46. ​​The replaceable printhead according to claim 43, characterized in that, The wire limiting mechanism includes a movable limiting member and an elastic reset member. The limiting member cooperates with the wire limiting mechanism to restrict the movement of the wire within the feeding channel. When the limiting member is disengaged from the wire limiting mechanism, the elastic reset member releases the wire limiting mechanism from restricting the movement of the wire. Alternatively, the limiting member cooperates with the wire limiting mechanism to release the wire limiting mechanism from restricting the movement of the wire. When the limiting member is disengaged from the wire limiting mechanism, the elastic reset member releases the wire limiting mechanism from restricting the movement of the wire.

47. The replaceable printhead according to claim 44, characterized in that, The reset component is at least one of the following: an elastic reset component, a magnetic component, an electromagnet, and a motor.

48. A 3D printer, characterized in that, include: The printhead is replaceable and is equipped with a feeding channel and a heating chamber. The material line enters the heating chamber through the feeding channel. A tool head, which is used to engage or disengage with the replaceable print head, wherein when the tool head is engaged with the replaceable print head, the extrusion mechanism engages with the replaceable print head and feeds the feed line into the heating chamber to perform the printing task; A placement rack for holding the replaceable printhead, which is detached from the extrusion mechanism; A wire limiting mechanism is used to restrict the movement of the wire in the feeding channel when the replaceable printhead is placed on the placement frame.

49. The 3D printer according to claim 48, characterized in that, The wire limiting mechanism is disposed on the replaceable print head. The wire limiting mechanism is configured to switch from a wire release state to a wire locking state under the action of the placement frame, or to switch from a wire locking state to a wire release state under the action of the tool head.

50. The 3D printer according to claim 49, characterized in that, The tool head is configured to move the replaceable print head to the alignment position of the placement frame, and then the 3D printer places the replaceable print head on the placement frame; and / or, the tool head picks up the replaceable print head from the placement frame and continues printing after leaving the alignment position; the placement frame is provided with a limiting member, which is configured to switch the filament limiting mechanism from a filament release state to a filament locking state when the replaceable print head reaches the alignment position or during the placement of the replaceable print head; and / or, the limiting member is configured to switch the filament limiting mechanism from a filament locking state to a filament release state during the tool head picking up the replaceable print head or after the replaceable print head leaves the alignment position.

51. The 3D printer according to claim 50, characterized in that, The replaceable printhead has a slot communicating with the feeding channel. The wire limiting mechanism includes a movable limiting member and a resetting member. The movable limiting member is at least partially disposed within the slot. After the replaceable printhead is placed on the placement frame, the movable limiting member abuts against the placement frame to lock the wire. The resetting member is used to reset the movable limiting member after the replaceable printhead leaves the alignment position, so that the movable limiting member releases the wire. Alternatively, the replaceable printhead has a slot communicating with the feeding channel. The wire limiting mechanism includes a movable limiting member and a resetting member. The movable limiting member is at least partially disposed within the slot. After the replaceable printhead leaves the alignment position, the movable limiting member abuts against the tool head to release the wire. The resetting member is used to reset the movable limiting member after the replaceable printhead is placed on the placement frame, so that the movable limiting member locks the wire.

52. The 3D printer according to claim 51, characterized in that, The reset component is at least one of the following: an elastic reset component, a magnetic component, an electromagnet, and a motor.

53. The 3D printer according to claim 51, characterized in that, The movable limiting member includes a limiting structure, which is disposed at the end of the movable limiting member. The limiting structure is a cutting edge, tip, protrusion that can engage the wire, or a toothed, hooked, or claw-shaped structure that extends downward.

54. The 3D printer according to claim 51, characterized in that, The movable limiting component switches between the released feed line state and the locked feed line state by moving or rotating.

55. The 3D printer according to claim 48, characterized in that, The wire limiting mechanism is disposed on the placement frame. The wire limiting mechanism is configured to switch from a wire releasing state to a wire locking state under the action of the tool head, and / or, when the tool head is disengaged from the placement frame, the wire limiting mechanism is in the wire releasing state.

56. The 3D printer according to claim 50, characterized in that, The tool head is configured to move the replaceable print head to the alignment position of the placement frame, and then the 3D printer places the replaceable print head on the placement frame; the filament limiting mechanism is configured to lock the filament when the tool head moves to the alignment position of the placement frame or during the placement of the replaceable print head, and / or the limiting member is configured to switch from a filament-locking state to a filament-releasing state during the process of the tool head picking up the replaceable print head or after the tool head leaves the alignment position.

57. A 3D printer, characterized in that, include: A replaceable printhead is connected to a feed pipe, one end of which is connected to a feed channel and the other end to a feeding mechanism to convey the feed line to the replaceable printhead. The mounting frame has multiple replaceable printhead placement positions, with different placement positions corresponding to different replaceable printheads. The tool head is provided with a signal element A371. When the replaceable printhead moves to the alignment position of the placement frame or is in the placement position, the placement frame is provided with a detection element A372 corresponding to the signal element A371. The detection element A372 is used to detect the signal when the replaceable printhead signal element A371 generates a signal, so as to determine whether the replaceable printhead is placed in place or whether it is placed in the corresponding placement position.

58. The 3D printer according to claim 57, characterized in that, The combination of the signal element A371 and the detection element A372 is at least one of the following: the replaceable print head is provided with a heating element, the heating element is connected to the 3D printer through a wiring harness to obtain heating current, the signal element A371 is the wiring harness, and the detection element A372 is an inductive sensor; or, the signal element A371 is a light source, and the detection element A372 is a photoelectric sensor; or, the signal element A371 is a coil, and the detection element A372 is a Hall sensor.

59. The 3D printer according to claim 58, characterized in that, The replaceable printhead has a feed channel and a notch. The feed line enters the heating chamber through the feed channel. The notch is provided in the middle of the feed channel to expose the feed line for engagement with the tool head. The wire harness is located on the side of the replaceable printhead away from the notch and facing the placement frame. When the replaceable printhead moves to the alignment position of the placement frame or is in the placement position, the wire harness is correspondingly arranged with the detection element A372 on the placement frame.

60. A control method for a 3D printer, characterized in that, include: The 3D printer includes a tool head equipped with a replaceable print head. The replaceable print head includes a heating chamber and a nozzle. The heating chamber heats the filament into a molten state and outputs it through the nozzle to a heated bed for layer-by-layer printing in the height direction. Replacing the replaceable print head with the tool head includes: the tool head is configured to move the replaceable print head along the alignment direction to the alignment position of the placement frame; the 3D printer switches the replaceable print head from the mating position to the unlocked position along the assembly direction and places it on the placement frame; the placement frame lowers the replaceable print head along the height direction so that the replaceable print head is aligned with the unlocked position on the tool head; during or before the placement frame lowers, the heated bed is controlled to lower by a preset distance.

61. The control method for a 3D printer according to claim 60, characterized in that, When the printing height is between 0-20mm, the tool head controls the heated bed to descend a preset distance when replacing the replaceable print head.

62. The control method for a 3D printer according to claim 60, characterized in that, The placement rack includes a blocking component for engaging with the replaceable printhead during placement to block the nozzle outlet at least partially during placement.

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