Printhead and 3D printer

Abstract

The utility model discloses a printing head and 3D printer relates to 3D printing technical field, the printing head includes printing head body, hot end device and first elastic part, the hot end device includes radiator, heat conducting spare, throat pipe and nozzle, heat conducting spare is arranged with the interval of radiator, the throat pipe portion with heat conducting spare contact, the throat pipe another portion with radiator contact, the nozzle is connected with heat conducting spare, the nozzle with throat pipe intercommunication, one end of first elastic part is connected with printing head body, and the other end of first elastic part is connected with hot end device. The utility model provides technical scheme aims at making nozzle retraction avoidance bit has printed model or foreign matter, avoids having printed model or nozzle to be destroyed.

Description

Technical Field

[0001] This utility model relates to the field of 3D printing technology, and in particular to a print head and a 3D printer. Background Technology

[0002] A 3D printer (also known as a stereo printer or three-dimensional printer) is a rapid prototyping process. Currently, the 3D printing technology that can be used is fused deposition modeling (FDM). FDM is a technology that constructs three-dimensional objects by printing layer by layer using powdered materials such as metal or plastic based on digital models. In practice, an FDM 3D printer uses a feeding mechanism to supply thermoplastic filament material to the print head. The thermoplastic filament material is heated to a molten state within the print head. The print head then extrudes the molten material onto the forming platform as it moves along the printing path, printing the three-dimensional object layer by layer.

[0003] In the process of developing this application, the inventors discovered that at least the following problems exist in the known technology: in the related technology, the nozzle on the print head is prone to scratching or colliding with the printed model or foreign objects, resulting in the destruction of the printed model or nozzle. Utility Model Content

[0004] The main purpose of this invention is to provide a print head and a 3D printer that allows the nozzle to retract when it encounters a printed model or foreign object, thus preventing damage to the printed model or the nozzle.

[0005] To achieve the above objectives, this utility model proposes a printhead, which is applied to a 3D printer, and the printhead includes:

[0006] Printhead body;

[0007] A hot-end device, comprising a radiator, a heat-conducting element, a throat, and a nozzle, wherein the heat-conducting element is spaced apart from the radiator, a portion of the throat contacts the heat-conducting element, another portion of the throat contacts the radiator, and the nozzle is connected to the heat-conducting element and communicates with the throat; and

[0008] A first elastic element, one end of which is connected to the printhead body, and the other end of which is connected to the hot end device.

[0009] In one embodiment, the printhead body includes:

[0010] The fastener has a limiting cavity, at least a portion of the hot end device is located in the limiting cavity, and the limiting cavity is provided with the first elastic element.

[0011] In one embodiment, the heat sink includes a positioning protrusion, at least a portion of which is located in the limiting cavity, and the first elastic member is sleeved on the positioning protrusion.

[0012] In one embodiment, the positioning protrusion is provided with a mounting ring platform, and one end of the first elastic member is connected to the mounting ring platform.

[0013] In one embodiment, the limiting cavity includes a first cavity segment and a second cavity segment that are connected to each other, wherein the first cavity segment is located on the side of the second cavity segment closer to the hot end device;

[0014] An installation step is provided at the connection between the first cavity segment and the second cavity segment, and the other end of the first elastic member abuts against the installation step.

[0015] In one embodiment, the positioning protrusion is provided with a limiting groove, and the printhead body includes a limiting member movably disposed in the limiting groove, the limiting member being used to realize the detachable connection between the printhead body and the hot end device.

[0016] In one embodiment, the limiting member is elastically connected to the fixing member.

[0017] On the other hand, this utility model also proposes a 3D printer, comprising:

[0018] Molding platform;

[0019] A printhead is movably disposed from the forming platform. The printhead includes a printhead body and a hot-end device. The hot-end device includes a heat sink, a heat-conducting element, a throat, and a nozzle. The heat-conducting element is spaced apart from the heat sink. The throat connects the heat-conducting element and the heat sink. The nozzle is connected to the heat-conducting element and communicates with the throat. The printhead body includes a limiting element for detachably connecting to the hot-end device. When the limiting element is connected to the hot-end device, the hot-end device is movable relative to the limiting element in at least one direction.

[0020] In one embodiment, the printhead body is provided with a limiting cavity, and the printhead further includes a first elastic member disposed in the limiting cavity. The relative movement of the hot end device and the limiting member causes the length of the first elastic member to change.

[0021] In one embodiment, the heat sink includes a heat sink component and a positioning protrusion connected together. The heat sink component has the nozzle at one end opposite to the positioning protrusion. At least a portion of the positioning protrusion is located in the limiting cavity. The first elastic element is sleeved on the positioning protrusion.

[0022] In one embodiment, the positioning protrusion is provided with a limiting groove, and the limiting member can move relative to the limiting groove.

[0023] In one embodiment, the positioning protrusion includes an insertion section and a limiting section, and a mounting ring is provided at the connection between the insertion section and the limiting section. The first elastic member is sleeved on the insertion section, and one end of the first elastic member abuts against the mounting ring.

[0024] In one embodiment, the other end of the first elastic member abuts against the wall of the limiting cavity.

[0025] In one embodiment, the limiting cavity has a bottom opening, wherein when the limiting member is connected to the hot end device, the limiting member closes at least part of the bottom opening, and when the limiting member is disassembled from the hot end device, the limiting member opens the bottom opening.

[0026] In one embodiment, the printhead body further includes a fixing member defining the limiting cavity and a second elastic member, the second elastic member connecting the fixing member and the limiting member.

[0027] One of the above technical solutions has the following advantages or beneficial effects: When the hot end device is connected to the print head body, it can move relative to the print head body. When the nozzle encounters an obstacle such as a printed model or a foreign object, the nozzle will be subjected to the force of the obstacle, and the hot end device will move relative to the print head body to drive the nozzle to retract and avoid the printed model or foreign object, so as to prevent the printed model or nozzle from being damaged. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0029] Figure 1 A schematic diagram of the print head structure in one embodiment of this utility model;

[0030] Figure 2 A partially exploded view of the printhead in one embodiment of this utility model;

[0031] Figure 3 An exploded view of the hot-end device in one embodiment of this utility model;

[0032] Figure 4A schematic diagram of the limiting member in one embodiment of this utility model;

[0033] Figure 5 A cross-sectional structural diagram of the hot end device and the fixing member in one embodiment of the present utility model;

[0034] Figure 6 for Figure 5 A magnified structural diagram of point A in the middle.

[0035] Explanation of icon numbers:

[0036] 100. Printhead; 1. Printhead body; 11. Fixing component; 111. Limiting cavity; 1111. First cavity section; 1112. Second cavity section; 1113. Mounting step; 1114. Bottom opening; 112. Mounting cavity; 12. Second elastic element; 13. Limiting component; 131. First through hole; 132. Second through hole; 2. Hot end device; 21. Radiator; 211. Radiator component; 212. Positioning protrusion; 2121. Extension section; 2122. Limiting section; 2123. Mounting ring platform; 2124. Limiting groove; 22. Heat-conducting component; 23. Throat tube; 24. Nozzle; 25. Adapter plate; 26. First bolt; 27. Second bolt; 28. Heating element; 3. First elastic element.

[0037] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0039] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0040] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0041] Please refer to the reference. Figures 1 to 3 and Figure 5 As shown, this utility model proposes a printhead 100, which is applied to a 3D printer. The printhead 100 includes a printhead body 1, a hot end device 2, and a first elastic member 3. The hot end device 2 includes a heat sink 21, a heat conductor 22, a throat 23, and a nozzle 24. The heat conductor 22 is spaced apart from the heat sink 21. A part of the throat 23 is in contact with the heat conductor 22, and the other part of the throat 23 is in contact with the heat sink 21. The nozzle 24 is connected to the heat conductor 22 and communicates with the throat 23. One end of the first elastic member 3 is connected to the printhead body 1, and the other end of the first elastic member 3 is connected to the hot end device 2.

[0042] In this embodiment, the printhead body 1 drives the consumable material to be extruded through the hot-end device 2. The throat 23 of the hot-end device 2 is connected to the printhead body 1. The consumable material enters the throat 23 from the printhead body 1 and is finally extruded in a molten state through the nozzle 24. The heat-conducting element 22 in the hot-end device 2 is in contact with the throat 23. The heat-conducting element 22 receives heat from the heating element 28 to melt the consumable material. The heat sink 21 in the hot-end device 2 is spaced apart from the heat-conducting element 22 and is also in contact with the throat 23. It is used for heat dissipation to prevent the heat emitted by the heat-conducting element 22 from being transferred to other components through the throat 23, which would affect the normal operation and service life of other components. It also cools the consumable material in the throat 23 to prevent the throat 23 from becoming blocked. The heat-conducting element 22 is usually located close to the nozzle 24 so that the consumable material is in a molten state when it enters the nozzle 24. The heat sink 211 is usually located on the side of the heat-conducting element 22 away from the nozzle 24, which can prevent the consumable material in the throat 23 from melting at a certain distance from the nozzle 24, thus preventing the throat 23 from becoming blocked. The heat sink 211 and the heat conductor 22 are spaced apart to prevent the heat from the heat conductor 22 from being directly transferred to the heat sink 211, thus affecting the working efficiency of both.

[0043] It should be noted that the printer's drive mechanism is connected to the printhead body 1. During printing, the drive mechanism drives the printhead body 1, which in turn moves the hot-end device 2. When the nozzle 24 encounters an obstacle, it does not avoid the obstacle but forcibly scrapes or collides with the printed model or foreign objects, causing damage to the printed model or nozzle. In this invention, the hot-end device 2 can move relative to the printhead body 1 when connected to it via the first elastic member 3. Thus, when the nozzle 24 encounters an obstacle, it will be subjected to the force of the obstacle, and the hot-end device 2 will move relative to the printhead body 1 to retract the nozzle 24 and avoid the printed model or foreign objects, preventing damage to the printed model or nozzle.

[0044] Understandably, the heat-conducting component 22 can be connected to the heating component 28, with the heating component 28 serving as a heat source, and the heat-conducting component 22 receiving the heat from the heating component 28 to melt the consumable.

[0045] In actual implementation, the hot end device 2 and the printhead body 1 can move relative to each other through structures such as a sliding cavity or an elastic element. Optionally, the hot end device 2 is provided with a sliding cavity, in which part of the printhead body 1 is confined and can move along the sliding cavity.

[0046] In this embodiment, one end of the first elastic element 3 is connected to the printhead body 1, and the other end of the first elastic element 3 is connected to the hot end device 2. When the printhead 100 encounters an obstacle and retracts, the first elastic element 3 deforms; and when the printhead 100 is no longer in contact with the obstacle, the first elastic element 3 will spring back to its original position, thereby resetting the hot end device 2.

[0047] Understandably, the hot-end device 2 will encounter resistance from the first elastic element 3 during retraction. Therefore, the first elastic element 3 improves the stability of the hot-end device 2 relative to the printhead body 1, preventing it from moving arbitrarily relative to the printhead body 1 when not encountering an obstacle, thus affecting normal printing. Simultaneously, the first elastic element 3 also enables the hot-end device 2 to automatically reset. When the hot-end device 2 passes an obstacle, it will automatically reset from its retracted state under the action of the first elastic element 3, continuing normal printing. Optionally, the first elastic element 3 can be a spring.

[0048] In one embodiment of this utility model, such as Figure 1 , Figure 2 and Figure 5 As shown, the printhead body 1 includes a fixing member 11, the fixing member 11 is provided with a limiting cavity 111, at least part of the hot end device 2 is located in the limiting cavity 111, and the limiting cavity 111 is provided with a first elastic member 3.

[0049] In this embodiment, the limiting cavity 111 limits the hot-end device 2, guiding it to retract in a predetermined direction to prevent it from tilting during retraction and colliding with the printhead body 1, causing damage or affecting the transmission of consumables within the throat 23, thus preventing the printhead 100 from printing normally. The limiting cavity 111 also limits the first elastic member 3, ensuring it deforms or resets accurately along the moving direction of the hot-end device 2. The direction of the elastic force generated is also consistent with the moving direction of the hot-end device 2, preventing the first elastic member 3 from tilting during deformation or reset and preventing jamming or other problems during the movement and reset of the hot-end device 2. It can be understood that the moving direction of the limiting cavity 111 is the same as the moving direction of the hot-end device 2 during retraction.

[0050] In actual implementation, the fastener 11 can be part of the printhead body 1 housing or a part connected to the printhead body 1 housing; no specific limitation is made here. Optionally, the fastener 11 can be connected to the existing printhead body 1 by means of bolts or adhesive, so that users can independently modify the existing printhead body 1 that cannot be matched with the hot end device 2 of this utility model to assemble the hot end device 2 of this utility model.

[0051] In one embodiment of this utility model, such as Figures 1 to 3 and Figure 5 As shown, the heat sink 21 includes a positioning protrusion 212, at least part of which is located in the limiting cavity 111, and the first elastic member 3 is sleeved on the positioning protrusion 212.

[0052] In this embodiment, the positioning protrusion 212 can further limit the deformation or reset direction of the first elastic member 3 to prevent the first elastic member 3 from tilting and ensure the smoothness of the movement of the hot end device 2. When connecting the hot end device 2 and the print head body 1, the positioning protrusion 212 is inserted into the limiting cavity 111 to achieve the positioning and installation of the hot end device 2.

[0053] In one embodiment of this utility model, such as Figure 2 , Figure 3 and Figure 5 As shown, the positioning protrusion 212 is provided with a mounting ring platform 2123, and one end of the first elastic member 3 is connected to the mounting ring platform 2123.

[0054] In this embodiment, one end of the first elastic member 3 is connected to the mounting ring 2123 to ensure the stability of the first elastic member 3 during connection. The mounting ring 2123 can increase the area of ​​the first elastic member 3 under force, improve the uniformity of the deformation of the first elastic member 3, and reduce the possibility of the first elastic member 3 becoming skewed.

[0055] In actual implementation, the connection between one end of the first elastic element 3 and the mounting ring 2123 can be either abutment or adhesive bonding.

[0056] Understandably, the mounting slide is positioned on the outer periphery of the positioning protrusion 212 and surrounds the positioning protrusion 212. The first elastic member 3 is sleeved on the positioning protrusion 212 and connected to the mounting ring platform 2123.

[0057] In one embodiment of this utility model, such as Figures 2 to 4 As shown, the limiting cavity 111 includes a first cavity segment 1111 and a second cavity segment 1112 that are connected. The first cavity segment 1111 is located on the side of the second cavity segment 1112 that is close to the hot end device 2. An installation step 1113 is provided at the connection between the first cavity segment 1111 and the second cavity segment 1112, and the other end of the first elastic member 3 abuts against the installation step 1113.

[0058] In this embodiment, the first cavity segment 1111 and the second cavity segment 1112 have different cross-sectional dimensions, with the first cavity segment 1111 having a larger cross-sectional dimension than the second cavity segment 1112. At the connection between the first cavity segment 1111 and the second cavity segment 1112, the wall of the limiting cavity 111 retracts inward, forming an installation step 1113. The cross-sectional dimension of the first cavity segment 1111 matches the cross-sectional dimension of the mounting ring platform 2123, and the cross-sectional dimension of the second cavity segment 1112 matches the cross-sectional dimension of the positioning protrusion 212. When the hot-end device 2 is connected to the printhead body 1, the mounting ring platform 2123 is radially limited by the wall of the first cavity segment 1111, and the positioning protrusion 212 is radially limited by the wall of the second cavity segment 1112. When the hot-end device 2 retracts, it moves along the extension direction of the limiting cavity 111.

[0059] The two ends of the first elastic member 3 are respectively connected to the mounting ring 2123 of the hot end device 2 and the mounting step 1113 of the print head body 1. One end of the first elastic member 3 is limited by the mounting step 1113 and its position is fixed. When the hot end device 2 encounters an obstacle, the obstacle pushes the hot end device 2 to move relative to the print head body 1. The mounting ring 2123 of the hot end device 2 will drive the other end of the first elastic member 3 to move, causing the first elastic member 3 to deform.

[0060] In actual implementation, when the hot end device 2 moves relative to the printhead body 1, the mounting ring platform 2123 moves relative to the mounting step 1113, causing the first elastic element 3 located between the mounting ring platform 2123 and the mounting step 1113 to deform. It is understood that the mounting step 1113 increases the force-bearing area of ​​the first elastic element 3, improves the uniformity of deformation, and reduces the possibility of skewing. Depending on the positions of the mounting ring platform 2123 and the mounting step 1113, the first elastic element 3 can be in a stretched or compressed state. Optionally, the mounting ring platform 2123 and the mounting step 1113 are arranged opposite each other. When the hot end device 2 retracts due to an obstacle, the mounting ring platform 2123 moves closer to the mounting step 1113, causing the first elastic element 3 to compress. The first elastic element 3 is a compression spring, with its two ends abutting against the mounting ring platform 2123 and the mounting step 1113, respectively.

[0061] In one embodiment, the throat tube 23 is disposed through the positioning protrusion 212 and extends into the limiting cavity 111 to communicate with the print head body 1.

[0062] Optionally, the limiting cavity 111 may further include a third cavity segment located on the side of the second cavity segment 1112 away from the hot end device 2. The cross-sectional dimensions of the third cavity segment match the cross-sectional dimensions of the throat tube 23, and the throat tube 23 is limited in the radial direction by the cavity wall of the third cavity segment. Optionally, the fixing member 11 is also provided with a limiting protrusion, and the hot end device 2 is provided with a limiting groove corresponding to the limiting protrusion. When the hot end device 2 is connected to the printhead body 1, the limiting protrusion extends into the limiting groove to prevent the hot end device 2 from rotating around the axis of the throat tube 23 after being connected to the printhead body 1.

[0063] In one embodiment of this utility model, such as Figure 2 , Figure 3 and Figure 5 As shown, the positioning protrusion 212 is provided with a limiting groove 2124, and the print head body 1 includes a limiting member 13 movably disposed in the limiting groove 2124. The limiting member 13 is used to realize the detachable connection between the print head body 1 and the hot end device 2.

[0064] In this embodiment, the hot-end device 2 is connected to the printhead body 1 via a limiting member 13. By moving the limiting member 13, the relative position between the limiting member 13 and the hot-end device 2 can be changed, thereby changing the connection state between the hot-end device 2 and the limiting member 13, allowing the hot-end device 2 to be connected to or disconnected from the printhead body 1. The detachable design of the hot-end device 2 facilitates independent maintenance and replacement, improving user convenience.

[0065] In this embodiment, when the limiting member 13 extends into the limiting groove 2124, the limiting member 13 is in the connection position connected to the hot end device 2, thereby limiting the hot end device 2 and connecting the hot end device 2 to the print head body 1. When the limiting member 13 leaves the limiting groove 2124, the limiting member 13 is in the separation position from the hot end device 2, releasing the limitation on the hot end device 2, so that the hot end device 2 can be separated from the print head body 1.

[0066] Understandably, when the limiting member 13 is connected to the hot-end device 2, the hot-end device 2 can move relative to the limiting member 13 in at least one direction, so that when the printhead encounters an obstacle, the hot-end device 2 can retract relative to the printhead body 1 to avoid the obstacle. The direction of movement of the hot-end device 2 during retraction is set at an angle to the direction of movement of the limiting member 13, so as to avoid the movement of the hot-end device 2 during retraction affecting the connection between the hot-end device 2 and the limiting member 13. Understandably, the width of the limiting groove 2124 in the movable direction of the hot-end device 2 is greater than the thickness of the limiting member 13. When the hot-end device 2 moves relative to the printhead body 1, the limiting member 13 also moves relatively within the limiting groove 2124.

[0067] In one embodiment of this utility model, such as Figure 2 , Figure 3 and Figure 5 As shown, the limiting member 13 is elastically connected to the fixing member 11.

[0068] Understandably, the fixed part 11 is in a fixed position, and the limiting part 13 can move relative to the fixed part 11 to limit or release the hot end device 2, that is, to connect or disconnect from the hot end device 2, so that the hot end device 2 is connected to or disconnected from the print head body 1.

[0069] In this embodiment, the fixing member 11 and the limiting member 13 are connected by the second elastic member 12. When the limiting member 13 is connected to the hot-end device 2, the second elastic member 12 is in a reset state. When the limiting member 13 moves relative to the fixing member 11 and releases the hot-end device 2, the second elastic member 12 is in a deformed state. When the external force on the limiting member 13 is removed, the second elastic member 12 rebounds and drives the limiting member 13 to reset, and the limiting member 13 will return to the position of limiting the hot-end device 2. Thus, when the limiting member 13 leaves the position connected to the hot-end device 2, the limiting member 13 will be subjected to the rebound force of the second elastic member 12. When the external force is removed, the limiting member 13 can automatically maintain the connection position with the hot-end device 2, improving the stability of the limiting member 13 when connected to the hot-end device 2, and preventing the limiting member 13 from being displaced due to accidental shaking when connected to the hot-end device 2, thus preventing the hot-end device 2 from falling off.

[0070] Please refer to the reference. Figures 1 to 6As shown, an embodiment of this utility model also provides a 3D printer, including a forming platform and a print head 100. The print head 100 is movably disposed from the forming platform. The print head 100 includes a print head body 1 and a hot end device 2. The hot end device 2 includes a heat sink 21, a heat conductor 22, a throat 23, and a nozzle 24. The heat conductor 22 is spaced apart from the heat sink 21. The throat 23 connects the heat conductor 22 and the heat sink 21. The nozzle 24 is connected to the heat conductor 22 and communicates with the throat 23. The print head body 1 includes a limiting member 13, which is detachably connected to the hot end device 2. When the limiting member 13 is connected to the hot end device 2, the hot end device 2 can move relative to the limiting member 13 in at least one direction.

[0071] In one embodiment, a forming platform is used to form the extruded consumables. The print head 100 moves above the forming platform to print a preset model. In one embodiment, the print head 100 can move in the X-axis and Y-axis directions, and the forming platform can move in the Z-axis direction, with the X-axis, Y-axis, and Z-axis directions being perpendicular to each other. The print head body 1 is used to drive the consumables through the hot end device 2 for extrusion. The throat 23 of the hot end device 2 is connected to the print head body 1. The consumables enter the throat 23 from the print head body 1 and are finally extruded in a molten state through the nozzle 24. The heat-conducting element 22 in the hot end device 2 contacts the throat 23 to heat the consumables inside the throat 23, causing them to enter a molten state. The heat sink 21 in the hot end device 2 is spaced apart from the heat-conducting element 22 and also contacts the throat 23 for heat dissipation. This prevents the heat emitted by the heat-conducting element 22 from being transferred to other components through the throat 23, affecting the normal operation and service life of other components. It also cools the consumables inside the throat 23 to prevent the throat 23 from becoming blocked.

[0072] In this embodiment, the hot-end device 2 is connected to the printhead body 1 via a limiting member 13. By moving the limiting member 13, the relative position between the limiting member 13 and the hot-end device 2 can be changed, thereby changing the connection state between the hot-end device 2 and the limiting member 13, allowing the hot-end device 2 to be connected to or disconnected from the printhead body 1. The detachable design of the hot-end device 2 facilitates independent maintenance and replacement, improving user convenience. When the limiting member 13 is connected to the hot-end device 2, the hot-end device 2 can move relative to the limiting member 13 in at least one direction, so that when the printhead encounters an obstacle, the hot-end device 2 can retract relative to the printhead body 1 to avoid the obstacle.

[0073] In one embodiment of this utility model, such as Figures 1 to 3 and Figure 5 As shown, the printhead body 1 is provided with a limiting cavity 111, and the printhead 100 also includes a first elastic member 3 disposed in the limiting cavity 111. The relative movement of the hot end device 2 and the limiting member 13 causes the length of the first elastic member 3 to change.

[0074] In this embodiment, a first elastic element 3 is provided within the limiting cavity 111. When the hot-end device 2 encounters an obstacle and retracts, it causes the first elastic element 3 to deform. When the hot-end device 2 is no longer in contact with the obstacle, the first elastic element 3 rebounds and resets, causing the hot-end device 2 to reset. The first elastic element 3 improves the stability of the position of the hot-end device 2 relative to the printhead body 1, thus improving printing reliability. The limiting cavity 111 limits the first elastic element 3, ensuring that the first elastic element 3 deforms or resets accurately along the moving direction of the hot-end device 2. The direction of the elastic force generated is also consistent with the moving direction of the hot-end device 2, preventing the first elastic element 3 from skewing during deformation or reset and preventing problems such as jamming during the movement and reset of the hot-end device 2. It can be understood that the moving direction of the limiting cavity 111 is the same as the moving direction of the hot-end device 2 when it retracts.

[0075] In one embodiment of this utility model, such as Figure 2 , Figure 3 and Figure 5 As shown, the radiator 21 includes a heat sink 211 and a positioning protrusion 212 connected to each other. The end of the heat sink 211 facing away from the positioning protrusion 212 is provided with a nozzle 24. At least part of the positioning protrusion 212 is located in the limiting cavity 111. The first elastic member 3 is sleeved on the positioning protrusion 212.

[0076] In this embodiment, the heat sink 211 is used for heat dissipation. The heat sink 211 may include multiple spaced heat dissipation fins and a cooling fan. The heat dissipation fins are used to conduct heat, and the cooling fan is used to cool the heat dissipation fins to ensure the heat dissipation efficiency of the heat sink 211. The positioning protrusion 212 connected to the heat sink 211 can further limit the deformation or reset direction of the first elastic member 3 to prevent the first elastic member 3 from tilting during deformation and to ensure the smooth movement of the hot end device 2. When connecting the hot end device 2 and the printhead body 1, the positioning protrusion 212 is inserted into the limiting cavity 111 to achieve the positioning and installation of the hot end device 2.

[0077] Optionally, the extension direction of the limiting cavity 111 and the positioning protrusion 212 is consistent with the extension direction of the throat tube 23, and the retraction direction of the hot end device 2 is also consistent with the extension direction of the throat tube 23, so as to avoid the movement of the hot end device 2 causing the throat tube 23 or consumables to bend and affect the normal extrusion of the consumables.

[0078] In one embodiment of this utility model, such as Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the positioning protrusion 212 is provided with a limiting groove 2124, and the limiting member 13 can move relative to the limiting groove 2124.

[0079] In this embodiment, when the limiting member 13 extends into the limiting groove 2124, the limiting member 13 is in the connection position connected to the hot end device 2, thereby limiting the hot end device 2 and connecting the hot end device 2 to the print head body 1. When the limiting member 13 leaves the limiting groove 2124, the limiting member 13 is in the separation position from the hot end device 2, releasing the limitation on the hot end device 2, so that the hot end device 2 can be separated from the print head body 1.

[0080] Understandably, the direction of movement of the hot-end device 2 during retraction is set at an angle to the direction of movement of the limiting member 13, so as to avoid the movement of the hot-end device 2 during retraction affecting the connection between the hot-end device 2 and the limiting member 13. The width of the limiting groove 2124 in the movable direction of the hot-end device 2 is greater than the thickness of the limiting member 13. When the hot-end device 2 moves relative to the printhead body 1, the limiting member 13 also moves relatively within the limiting groove 2124.

[0081] In one embodiment of this utility model, such as Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the positioning protrusion 212 includes an insertion section 2121 and a limiting section 2122. An installation ring platform 2123 is provided at the connection between the insertion section 2121 and the limiting section 2122. A first elastic member 3 is sleeved on the insertion section 2121, and one end of the first elastic member 3 abuts against the installation ring platform 2123.

[0082] In this embodiment, when the hot end device 2 is connected to the printhead body 1, the extension section 2121 extends into the limiting cavity 111. One end of the first elastic member 3 is connected to the mounting ring 2123 to ensure the stability of the first elastic member 3 during connection. The mounting ring 2123 increases the area of ​​force on the first elastic member 3, improves the uniformity of deformation of the first elastic member 3, and reduces the possibility of the first elastic member 3 becoming skewed.

[0083] In actual implementation, the connection between one end of the first elastic element 3 and the mounting ring 2123 can be either abutment or adhesive bonding.

[0084] Optionally, the limiting groove 2124 of the limiting member 13 can be set in the limiting section 2122. The end of the limiting section 2122 away from the extension section 2121 is connected to the heat sink 211. The mounting ring 2123 and the heat sink 211 respectively form the two side walls of the limiting groove 2124.

[0085] In one embodiment of this utility model, such as Figure 5 As shown, the other end of the first elastic member 3 abuts against the wall of the limiting cavity 111.

[0086] In this embodiment, the limiting cavity 111 includes a first cavity segment 1111 and a second cavity segment 1112 that are connected to each other. The first cavity segment 1111 is located on the side of the second cavity segment 1112 closer to the hot end device 2. A mounting step 1113 is provided at the connection between the first cavity segment 1111 and the second cavity segment 1112. The mounting step 1113 abuts against the other end of the first elastic member 3. In this embodiment, when the hot end device 2 moves relative to the printhead body 1, the mounting ring platform 2123 moves relative to the mounting step 1113, and the first elastic member 3 located between the mounting ring platform 2123 and the mounting step 1113 deforms.

[0087] Understandably, the cross-sectional dimensions of the first cavity segment 1111 and the second cavity segment 1112 are different, with the first cavity segment 1111 having a larger cross-sectional dimension than the second cavity segment 1112. At the connection between the first cavity segment 1111 and the second cavity segment 1112, the wall of the limiting cavity 111 retracts inward, forming an installation step 1113. The cross-sectional dimension of the first cavity segment 1111 matches the cross-sectional dimension of the mounting ring platform 2123, and the cross-sectional dimension of the second cavity segment 1112 matches the cross-sectional dimension of the positioning protrusion 212. When the hot-end device 2 is connected to the printhead body 1, the mounting ring platform 2123 is radially limited by the wall of the first cavity segment 1111, and the positioning protrusion 212 is radially limited by the wall of the second cavity segment 1112. When the hot-end device 2 retracts, it moves along the extension direction of the limiting cavity 111.

[0088] In one embodiment of this utility model, such as Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the limiting cavity 111 has a bottom opening 1114. When the limiting member 13 is connected to the hot end device 2, the limiting member 13 closes at least part of the bottom opening 1114. When the limiting member 13 is disassembled from the hot end device 2, the limiting member 13 opens the bottom opening 1114.

[0089] In this embodiment, when connecting the hot-end device 2 and the printhead body 1, the positioning protrusion 212 extends into the limiting cavity 111 from the bottom opening 1114. The limiting groove 2124 closes at least part of the bottom opening 1114 to reduce the open area of ​​the bottom opening 1114. Thus, when the positioning protrusion 212 wants to detach from the limiting cavity 111 through the bottom opening 1114, it will be restricted by the limiting member 13, and the positioning protrusion 212 cannot detach from the limiting cavity 111 through the bottom opening 1114, thereby achieving the connection between the hot-end device 2 and the printhead body 1. When separating the hot-end device 2 and the printhead body 1, simply move the limiting member 13 to open the bottom opening 1114, and then pull the positioning protrusion 212 out of the limiting cavity 111 through the bottom opening 1114, thereby achieving the separation of the hot-end device 2 and the printhead body 1. Understandably, the connection position between the limiting member 13 and the hot end device 2 is the position that at least partially closes the bottom opening 1114, and the separation position between the limiting member 13 and the hot end device 2 is the position that opens the bottom opening 1114.

[0090] In this embodiment, the limiting member 13 contacts the mounting ring 2123 to limit the hot end device 2, maintaining the connection between the hot end device 2 and the printhead body 1. Optionally, the size of the bottom opening 1114 of the limiting cavity 111 matches the cross-sectional size of the positioning protrusion 212. When the positioning protrusion 212 extends into the limiting cavity 111, the mounting ring 2123 also extends into the limiting cavity 111. When the limiting member 13 closes at least part of the bottom opening 1114, it abuts against the lower support of the mounting ring 2123, preventing the mounting ring 2123 from detaching from the limiting cavity 111, thus connecting the hot end device 2 to the limiting member 13. When the limiting member 13 is in the split position, it no longer supports and abuts against the mounting ring 2123, allowing the mounting ring 2123 and the positioning protrusion 212 to detach from the limiting cavity 111 and separate from the printhead body 1.

[0091] Understandably, when the limiting member 13 is connected to the hot-end device 2, the limiting member 13 is in contact with the mounting ring 2123; when the limiting member 13 is disassembled from the hot-end device 2, the limiting member 13 separates from the mounting ring 2123. In actual implementation, the hot-end device 2 is located below the printhead body 1. Therefore, the hot-end device 2 actually needs to overcome the effect of gravity to maintain its connection position with the printhead body 1. When the limiting member 13 is in contact with the mounting ring 2123, the limiting member 13 is located below the mounting ring 2123 to support the mounting ring 2123, thereby maintaining the connection position of the hot-end device 2 with the printhead body 1. When the limiting member 13 is disassembled from the hot-end device 2, the limiting member 13 is moved out from under the mounting ring 2123, and the limiting member 13 no longer supports the mounting ring 2123, allowing the hot-end device 2 to be detached from the printhead body 1. This allows for quick assembly and disassembly of the hot-end device 2, facilitating its maintenance and replacement.

[0092] Optionally, when the limiting member 13 is in the connected position, the limiting member 13 can at least partially close the bottom opening 1114 of the limiting cavity 111, so that the mounting ring platform 2123 is limited within the limiting cavity 111, and can also extend into the limiting groove 2124 located in the limiting section 2122. In this embodiment, the limiting member 13 is provided with a first through hole 131 and a second through hole 132 that are connected. The cross-sectional dimension of the first through hole 131 is slightly larger than or equal to the cross-sectional dimension of the mounting ring platform 2123, and the cross-sectional dimension of the second through hole 132 is smaller than the cross-sectional dimension of the mounting ring platform 2123 but larger than the cross-sectional dimension of the limiting section 2122. The first through hole 131 and the second through hole 132 are arranged in parallel along the moving direction of the limiting member 13, and the connecting part of the first through hole 131 and the second through hole 132 can allow the limiting section 2122 to pass freely. When the limiting member 13 moves from the connecting position to the split position, the limiting segment 2122 leaves the second through hole 132 and enters the first through hole 131. At this time, the mounting ring 2123 can be pulled out from the bottom opening 1114. When connecting the hot end device 2, the positioning protrusion 212 passes through the first through hole 131 and the bottom opening 1114 and extends into the limiting cavity 111. Then, the limiting member 13 is moved from the split position to the connecting position, the limiting segment 2122 leaves the first through hole 131 and enters the second through hole 132, and the limiting member 13 enters the limiting groove 2124, while partially closing the bottom opening 1114 to connect the hot end device 2. Optionally, the extension segment 2121, the limiting segment 2122, and the mounting ring 2123 are coaxially arranged.

[0093] In one embodiment of this utility model, such as Figure 2 and Figure 5 The printhead body 1 shown also includes a fixing member 11 that defines a limiting cavity 111 and a second elastic member 12, the second elastic member 12 connecting the fixing member 11 and the limiting member 13.

[0094] Understandably, the fixed part 11 is in a fixed position, and the limiting part 13 can move relative to the fixed part 11 to limit or release the hot end device 2, that is, to connect or disconnect from the hot end device 2, so that the hot end device 2 is connected to or disconnected from the print head body 1.

[0095] In this embodiment, the fixing member 11 and the limiting member 13 are connected by the second elastic member 12. When the limiting member 13 is connected to the hot-end device 2, the second elastic member 12 is in a reset state. When the limiting member 13 moves relative to the fixing member 11 and releases the hot-end device 2, the second elastic member 12 is in a deformed state. When the external force on the limiting member 13 is removed, the second elastic member 12 rebounds and drives the limiting member 13 to reset, and the limiting member 13 will return to the position of limiting the hot-end device 2. Thus, when the limiting member 13 leaves the position connected to the hot-end device 2, the limiting member 13 will be subjected to the rebound force of the second elastic member 12. When the external force is removed, the limiting member 13 can automatically maintain the connection position with the hot-end device 2, improving the stability of the limiting member 13 when connected to the hot-end device 2, and preventing the limiting member 13 from being displaced due to accidental shaking when connected to the hot-end device 2, thus preventing the hot-end device 2 from falling off.

[0096] Optionally, the orientation of the second elastic member 12 is consistent with the movement direction of the limiting member 13 during connection or disassembly with the hot end device 2, to ensure the smoothness of the movement of the limiting member 13. Optionally, the fixing member 11 is provided with a mounting cavity 112, and the second elastic member 12 is at least partially confined within the mounting cavity 112, to ensure that the second elastic member 12 deforms along a set direction, further preventing jamming during the movement of the limiting member 13 and improving the convenience of using the limiting member 13.

[0097] In one embodiment, the limiting member 13 includes a movable part and a limiting part connected at an angle. The limiting part is used to connect with the hot end device 2. The second elastic member 12 is limited between the fixed member 11 and the movable part to ensure the uniformity of the force on the second elastic member 12. When moving the limiting member 13, the limiting member 13 can be pushed by the movable part to improve the ease of moving the limiting member 13.

[0098] In one embodiment, the limiting member 13 is movably connected to the fixing member 11. The fixing member 11 has a threaded hole, and the limiting member 13 has a through hole. One end of the bolt passes through the through hole and is threaded into the threaded hole. The limiting member 13 is limited between the fixing member 11 and the bolt nut. Optionally, the through hole is a strip-shaped hole and extends along the moving direction of the limiting member 13. When the limiting member 13 is translated, the bolt thread moves within the through hole. This further ensures that the limiting member 13 translates in a preset direction, improving the stability of the translation of the limiting member 13.

[0099] In one embodiment of this utility model, such as Figure 2 , Figure 3 and Figure 5 As shown, the hot end device 2 also includes an adapter plate 25, which connects the heat sink 21 and the heat-conducting component 22.

[0100] In this embodiment, the heat sink 21 and the heat conductor 22 are connected by an adapter plate 25. The adapter plate 25 can provide heat insulation, preventing the heat generated by the heat conductor 22 from being directly transferred to the heat sink 21. This prevents the heat sink 21 from affecting the heating effect of the heat conductor 22 on the consumables, which could lead to the consumables not melting completely and affecting the printing quality. At the same time, it also prevents the heat sink 21 from affecting the heat dissipation effect on the throat 23, thus preventing the throat 23 from becoming blocked.

[0101] Understandably, the heat-conducting component 22 is typically installed and fixed to the heat sink 21 by bolts. In this embodiment, the heat-conducting component 22 is connected to the heat sink 211 via an adapter plate 25 as an intermediate component to further reduce the heat transfer efficiency between the heat-conducting component 22 and the heat sink 21. Optionally, the adapter plate 25 can be made of a heat-insulating material, such as heat-insulating ceramic.

[0102] In one embodiment of this utility model, such as Figure 2 and Figure 3 As shown, the hot end device 2 also includes at least one first bolt 26, which connects the adapter plate 25 and the radiator 21.

[0103] In this embodiment, the adapter plate 25 and the heat sink 21 are connected by the first bolt 26 to fix the adapter plate 25. At the same time, the connection by the first bolt 26 also facilitates the disassembly and assembly of the adapter plate 25, making it easier to replace if damaged.

[0104] Optionally, the first bolt 26 may include multiple bolts, the adapter plate 25 is provided with a first through hole, the radiator 21 is provided with a first threaded hole, the bolt of the first bolt 26 passes through the first through hole and connects to the first threaded hole, and the adapter plate 25 is limited by the nut of the first bolt 26.

[0105] In one embodiment of this utility model, such as Figure 2 and Figure 3 As shown, the hot end device 2 also includes at least one second bolt 27, which connects the adapter plate 25 and the heat-conducting element 22.

[0106] In this embodiment, the adapter plate 25 and the heat-conducting component 22 are connected by the second bolt 27 to fix the heat-conducting component 22. At the same time, the connection by the second bolt 27 also facilitates the replacement of the heat-conducting component 22 in the future.

[0107] In actual implementation, the heat-conducting component 22 can be directly connected to the adapter plate 25 via the second bolt 27, or indirectly connected to the adapter plate 25 via the heating component 28 or other intermediate components via the second bolt 27.

[0108] Optionally, the heat-conducting element 22 is connected to the heating element 28, and the heating element 28 is sleeved on the outside of the heat-conducting element 22. The heating element 28 has a second through hole, and the adapter plate 25 has a second threaded hole. The screw of the second bolt 27 passes through the second through hole and connects to the second threaded hole. The heat-conducting element 22 is limited by the nut of the second bolt 27. Optionally, there may be multiple second bolts 27. It is understood that the first bolt 26 and the second bolt 27 do not contact each other. The heat-conducting element 22, the adapter plate 25, and the radiator 21 also do not contact each other directly, in order to further reduce the possibility of heat transfer from the heat conductor to the radiator 21.

[0109] Optionally, heat-insulating coatings may be applied to the adapter plate 25, the first bolt 26, and the second bolt 27.

[0110] This embodiment also provides a printhead 100, which is applied to a 3D printer. The printhead 100 includes a printhead body 1 and a hot-end device 2. The hot-end device 2 includes a heat sink 21, a heat-conducting element 22, a throat 23, and a nozzle 24. In the extending direction of the throat 23, the heat-conducting element 22 is spaced apart from the heat sink 21 and contacts the throat 23. The heat sink 21 also contacts the throat 23. The nozzle 24 is connected to the heat-conducting element 22 and communicates with the throat 23. The hot-end device 2 is detachably connected to the printhead body 1. When the hot-end device 2 is connected to the printhead body 1, the hot-end device 2 can move relative to the printhead body 1. The specific structure of the printhead body 1 and the hot-end device 2 and the beneficial effects thereon can be found in the above embodiments, and will not be repeated here.

[0111] In one embodiment, the printhead 100 further includes a first elastic element 3, which connects the hot-end device 2 and the printhead body 1 when the printhead body 1 is connected to the hot-end device 2. The specific structure of the first elastic element 3 and its beneficial effects can be found in the above embodiments, and will not be repeated here.

[0112] In one embodiment, the hot end device 2 is provided with a mounting ring 2123, and the printhead body 1 is provided with a mounting step 1113. When the printhead body 1 is connected to the hot end device 2, the first elastic member 3 is limited to being located between the mounting ring 2123 and the mounting step 1113. The specific structure of the mounting ring 2123 and the mounting step 1113 and the beneficial effects thereof can be found in the above embodiments, and will not be repeated here.

[0113] In one embodiment, the printhead body 1 includes a movable limiting member 13, which is used for detachable connection with the hot end device 2. The specific structure of the limiting member 13 and its beneficial effects can be found in the above embodiments, and will not be repeated here.

[0114] In one embodiment, when the limiting member 13 is connected to the hot end device 2, the limiting member 13 contacts the mounting ring 2123; when the limiting member 13 is disassembled from the hot end device 2, the limiting member 13 separates from the mounting ring 2123. The connection method of the limiting member 13 and its beneficial effects can be found in the above embodiments, and will not be repeated here.

[0115] In one embodiment, the printhead body 1 further includes a fixing member 11 and a second elastic member 12. The fixing member 11 has a mounting cavity 112, and the second elastic member 12 is disposed in the mounting cavity 112. The second elastic member 12 connects the fixing member 11 and the limiting member 13. The specific structure of the fixing member 11 and the second elastic member 12 and the beneficial effects thereon can be found in the above embodiments, and will not be repeated here.

[0116] In one embodiment, the hot-end device 2 further includes an adapter plate 25, which connects the heat sink 21 and the heat-conducting element 22. The specific structure of the adapter plate 25 and its beneficial effects can be found in the above embodiments, and will not be repeated here.

[0117] In one embodiment, the hot-end device 2 further includes at least one first bolt 26, which connects the adapter plate 25 and the heat sink 21. The connection method of the first bolt 26 and the beneficial effects thereof can be found in the above embodiments, and will not be repeated here.

[0118] In one embodiment, the hot end device 2 further includes at least one second bolt 27, which connects the adapter plate 25 and the heat-conducting element 22. The connection method of the second bolt 27 and its beneficial effects can be found in the above embodiments, and will not be repeated here.

[0119] This embodiment also provides a 3D printer, which includes a forming platform and a print head 100. The specific structure of the print head 100 and its beneficial effects can be found in the above embodiments, and will not be repeated here.

[0120] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A printhead used in a 3D printer, characterized in that, The printhead includes: Print head body; A hot-end device, comprising a radiator, a heat-conducting element, a throat, and a nozzle, wherein the heat-conducting element is spaced apart from the radiator, a portion of the throat contacts the heat-conducting element, another portion of the throat contacts the radiator, and the nozzle is connected to the heat-conducting element and communicates with the throat; and A first elastic element, one end of which is connected to the printhead body, and the other end of which is connected to the hot end device.

2. The printhead as described in claim 1, characterized in that, The printhead body includes: The fastener has a limiting cavity, at least a portion of the hot end device is located in the limiting cavity, and the limiting cavity is provided with the first elastic element.

3. The printhead as described in claim 2, characterized in that, The heat sink includes a positioning protrusion, at least a portion of which is located in the limiting cavity, and the first elastic element is sleeved on the positioning protrusion.

4. The printhead as described in claim 3, characterized in that, The positioning protrusion is provided with a mounting ring platform, and one end of the first elastic member is connected to the mounting ring platform.

5. The printhead as described in claim 3, characterized in that, The limiting cavity includes a first cavity segment and a second cavity segment that are connected to each other, with the first cavity segment located on the side of the second cavity segment closer to the hot end device. An installation step is provided at the connection between the first cavity segment and the second cavity segment, and the other end of the first elastic member abuts against the installation step.

6. The printhead as described in claim 3, characterized in that, The positioning protrusion is provided with a limiting groove, and the printhead body includes a limiting member movably disposed in the limiting groove. The limiting member is used to realize the detachable connection between the printhead body and the hot end device.

7. The printhead as described in claim 6, characterized in that, The limiting member is elastically connected to the fixing member.

8. A 3D printer, characterized in that, include: Molding platform; A printhead is movably disposed from the forming platform. The printhead includes a printhead body and a hot-end device. The hot-end device includes a heat sink, a heat-conducting element, a throat, and a nozzle. The heat-conducting element is spaced apart from the heat sink. The throat connects the heat-conducting element and the heat sink. The nozzle is connected to the heat-conducting element and communicates with the throat. The printhead body includes a limiting element for detachably connecting to the hot-end device. When the limiting element is connected to the hot-end device, the hot-end device is movable relative to the limiting element in at least one direction.

9. The 3D printer as described in claim 8, characterized in that, The printhead body is provided with a limiting cavity, and the printhead also includes a first elastic element disposed in the limiting cavity. The relative movement of the hot end device and the limiting element causes the length of the first elastic element to change.

10. The 3D printer as described in claim 9, characterized in that, The radiator includes a heat sink component and a positioning protrusion connected together. The nozzle is provided at one end of the heat sink component away from the positioning protrusion. At least part of the positioning protrusion is located in the limiting cavity. The first elastic element is sleeved on the positioning protrusion.

11. The 3D printer as claimed in claim 10, characterized in that, The positioning protrusion is provided with a limiting groove, and the limiting member can move relative to the limiting groove.

12. The 3D printer as described in claim 10, characterized in that, The positioning protrusion includes an insertion section and a limiting section. A mounting ring is provided at the connection between the insertion section and the limiting section. The first elastic element is sleeved on the insertion section, and one end of the first elastic element abuts against the mounting ring.

13. The 3D printer as described in claim 12, characterized in that, The other end of the first elastic element abuts against the wall of the limiting cavity.

14. The 3D printer as described in claim 9, characterized in that, The limiting cavity has a bottom opening. When the limiting member is connected to the hot end device, the limiting member closes at least part of the bottom opening. When the limiting member is disassembled from the hot end device, the limiting member opens the bottom opening.

15. The 3D printer as described in claim 9, characterized in that, The printhead body also includes a fixing member defining the limiting cavity and a second elastic member, the second elastic member connecting the fixing member and the limiting member.

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