Hot end structure, printing head of three-dimensional printer and three-dimensional printer

Abstract

The invention discloses a hot end structure, a printing head of a three-dimensional printer and the three-dimensional printer, and the hot end structure comprises a hot end assembly which comprises cooling fins, a throat pipe, a heating block and a nozzle which are connected in sequence; the heating seat assembly is used for heating the heating block; and the fixing assembly is used for detachably connecting the hot end assembly with the heating seat assembly, and the heating block is fixedly attached to the heating seat assembly under the condition that the hot end assembly is connected with the heating seat assembly. And the hot end assembly and the heating seat assembly are detachably connected through the fixing assembly, so that the hot end is convenient to maintain and replace.

Description

[0001] This application is a divisional application. The application number of the original application is 202311115060.3, and the original application date is August 29, 2023. The entire contents of the original application are incorporated into this application by reference. Technical Field

[0002] The present application relates to the field of three-dimensional printers, in particular to a hot end structure, a print head of a three-dimensional printer and a three-dimensional printer. Background Art

[0003] 3D printer (also known as three-dimensional printer or stereo printer) is a kind of rapid prototyping process equipment. The 3D printing technology that 3D printers can currently use is fused deposition modeling (FDM). FDM is a technology that constructs three-dimensional objects by printing layer by layer based on digital models using materials such as powdered metal or plastic. In specific implementation, a three-dimensional printer using FDM technology uses a feeding mechanism to supply the device's hot-melt filament material to the hot end of the three-dimensional printer, and the hot-melt filament material is heated to a molten state in the hot end. The hot end can then extrude the molten material onto the printing plate while moving along the printing path of the three-dimensional printer, printing out three-dimensional objects layer by layer.

[0004] The hot end of the wire material usually includes a heat dissipation area, a throat area, and a heating area. The throat has a heat insulation effect. In the wire material related technology, the maintenance and replacement frequency of the hot end is often high, which causes great trouble to users and maintenance personnel. In addition, the hot end is installed in the heat dissipation area and fixedly connected to the print head body, making the hot end a long cantilever structure. The throat is the weakest part of the structure, so the force-bearing capacity of the throat is also required to be high. Summary of the invention

[0005] In view of the above problems, embodiments of the present application are proposed to provide a hot end structure, a print head of a 3D printer, and a 3D printer that overcome the above problems or at least partially solve the above problems.

[0006] In a first aspect of the present application, an embodiment of the present application discloses a hot end structure, comprising:

[0007] A hot end assembly, including a heat sink fin, a throat, a heating block and a nozzle connected in sequence;

[0008] A heating seat assembly, used for heating the heating block;

[0009] The fixing assembly is used to detachably connect the hot end assembly to the heating seat assembly, and when the hot end assembly is connected to the heating seat assembly, the heating block is fixedly attached to the heating seat assembly.

[0010] Optionally, the fixing component is rotatably connected to the heating seat component; when the fixing component is rotated to a first preset position, the fixing component squeezes the heating block to fit with the heating seat component.

[0011] Optionally, when the fixing assembly is rotated to a second preset position, the heating block can be separated from the heating seat assembly.

[0012] Optionally, the heating seat assembly is used to be fixedly connected to the three-dimensional printing head body.

[0013] Optionally, the heating seat assembly is fixedly connected to the 3D printing head body by a metal screw, and the heat dissipation fin has a magnetic element. When the hot end assembly is fixedly connected to the heating seat assembly, the magnetic element attracts the metal screw and fits with the head of the metal screw.

[0014] Optionally, the heating block has a first plane, and the first plane is aligned with the second plane of the heating seat assembly.

[0015] Optionally, a first limiting structure is provided on the plane of the heating seat assembly. When the first plane is in contact with the second plane, the first limiting structure abuts against an edge of the first plane to limit the relative movement of the heating block and the heating seat assembly in at least one direction parallel to the first plane.

[0016] Optionally, a second limiting structure is provided on the first plane. When the first plane is in contact with the second plane, the second limiting structure abuts against an edge of the second plane to limit the relative movement of the heating block and the heating seat assembly in at least one direction parallel to the first plane.

[0017] Optionally, the fixing assembly includes:

[0018] The buckle is rotatably connected to the heating seat assembly, and when the buckle is rotated to the first preset position, the buckle is locked and squeezes the heating block to fit the heating seat assembly.

[0019] Optionally, the buckle comprises:

[0020] A first pressing block is rotatably connected to the heating seat assembly;

[0021] a first wire spring, rotatably connected to the heating seat assembly, wherein the rotation axis of the first pressing block and the rotation axis of the first wire spring are parallel and located on both sides of a plane of the heating seat assembly in contact with the heating block;

[0022] When the first pressing block and the first wire spring are rotated to the first preset position close to each other, the first pressing block and the first wire spring are buckled, the first wire spring restricts the movement of the first pressing block, and the first pressing block presses the heating block.

[0023] Optionally, the heating seat assembly comprises:

[0024] A fixing seat, used for fixed connection to the three-dimensional printing head body, wherein the fixing seat is made of heat-insulating and high-temperature resistant material;

[0025] The heating seat is fixedly connected to the fixing seat and detachably connected to the hot end assembly.

[0026] Optionally, the hot end assembly is detachably connected to the heating seat assembly, including: the heating block is detachably connected to the heating seat assembly.

[0027] Optionally, the heat dissipation fins are detachably connected to the 3D printing head body.

[0028] In a second aspect of the present application, an embodiment of the present application discloses a three-dimensional printing head, including the hot end structure as described above and a three-dimensional printing head body.

[0029] In the third aspect of the present application, an embodiment of the present application discloses a three-dimensional printer, comprising a three-dimensional print head as described above, a printing platform and a driving device, wherein the three-dimensional print head is arranged above the printing platform, the driving device is used to drive the three-dimensional print head and the printing platform to generate relative displacement, and the three-dimensional print head is used to extrude material to print a model.

[0030] The embodiments of the present application have at least one of the following advantages:

[0031] The embodiment of the present application uses a fixing component to detachably connect the hot end component and the heating seat component, which facilitates the maintenance and replacement of the hot end; and because the heating seat component is used to be fixedly connected to the three-dimensional printing head body, the hot end component is connected to the printing head body in the heating area, thereby reducing the stress on the throat and reducing the possibility of stress, bending and damage to the hot end structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of a hot end structure of an embodiment of the present application Figure 1 ;

[0033] Figure 2A schematic diagram of a hot end assembly of a hot end structure according to an embodiment of the present application;

[0034] Figure 3 A schematic diagram of a hot end structure of an embodiment of the present application Figure 2 ;

[0035] Figure 4a A schematic diagram of another hot end structure of an embodiment of the present application Figure 1 ;

[0036] Figure 4b A schematic diagram of another hot end structure of an embodiment of the present application Figure 2 ;

[0037] Figure 4c A schematic diagram of another hot end structure of an embodiment of the present application Figure 3 ;

[0038] Figure 4d A fourth structural diagram of another hot end structure of an embodiment of the present application;

[0039] Figure 5 This is a schematic structural diagram of another hot end structure of an embodiment of the present application;

[0040] Figure 6 This is a schematic structural diagram of another hot end structure of an embodiment of the present application;

[0041] Figure 7 A schematic diagram of a hot end structure of an embodiment of the present application Figure 3 ;

[0042] Figure 8 is a schematic structural diagram of a three-dimensional printing head according to an embodiment of the present application;

[0043] Fig. 9 It is a structural schematic diagram of a three-dimensional printer according to an embodiment of the present application.

[0044] Description of reference numerals: 100-hot end assembly, 110-heating fin, 111-magnetic element, 120-throat, 130-heating block, 140-nozzle, 131-second limiting structure, 140-nozzle, 200-heating seat assembly, 210-fixing seat, 220-heating seat, 230-temperature measuring assembly, 300-fixing assembly, 310-fastener, 311-first sheet metal part, 312-second wire spring, 313-second sheet metal part, 314-L-shaped wire spring, 315-first pressing block, 316-first wire spring, 317-clamping cam, 318-cam handle;

[0045] 10-hot end structure, 12-first guide rail, 13-second guide rail, 14-third guide rail, 20-3D printing head body, 31-printing panel, 32-heat bed, 33-base;

[0046] 1-3D printing head, 2-driving device, 3-printing platform, 4-feeding device. DETAILED DESCRIPTION

[0047] The implementation of the technical solution of the present application is further described in detail below in conjunction with the accompanying drawings.

[0048] Reference Figure 1 , showing a schematic diagram of a hot end structure of an embodiment of the present application Figure 1 The hot end structure may specifically include the following components:

[0049] The hot end assembly 100 includes a heat sink 110, a throat 120, a heating block 130 and a nozzle 140 connected in sequence;

[0050] A heating seat assembly 200, used for heating the heating block 130;

[0051] The fixing assembly 300 is used to detachably connect the hot end assembly 100 to the heating seat assembly 200 , and when the hot end assembly 100 is connected to the heating seat assembly 200 , the heating block 130 is fixedly attached to the heating seat assembly 200 .

[0052] In the embodiment of the present application, the hot end structure includes three parts: a hot end assembly 100, a heating seat assembly 200 and a fixing assembly 300. Figure 2 The hot end assembly 100 includes a heat sink 110, a throat 120, a heating block 130 and a nozzle 140 connected in sequence. The heat sink 110 dissipates the heat in the heating assembly into the air based on the tip heat release effect. The throat 120 guides the wire material, the heating block 130 heats the wire material into a molten state, and the nozzle 140 extrude the molten wire material to print the model.

[0053] The heating seat assembly 200 can be connected to the heating block 130, and when connected to the heating block 130, the heating block 130 is heated so that the heating block 130 can heat the wire material.

[0054] The fixing assembly 300 can detachably connect the hot end assembly 100 and the heating seat assembly 200, that is, under the action of the fixing assembly 300, the hot end assembly 100 and the heating seat assembly 200 can be fixedly connected, and when the fixing assembly 300 is released, the hot end assembly 100 and the heating seat assembly 200 can be separated. The connection between the hot end assembly 100 and the heating seat assembly 200 refers to the connection between the heating block 130 and the heating seat assembly 200. When the hot end assembly 100 is connected to the heating seat assembly 200, the heating block 130 is fixedly attached to the heating seat assembly 200, and the heating block 130 and the heating seat assembly 200 have a large heating area, so that the heat on the heating seat assembly 200 can be more efficiently transferred to the heating block 130. In addition, the heating block 130 is attached to the heating seat 220 and connected, and the heating block 130 is used as the force-bearing area. The connection between the fixed assembly 300 and the heating block 130 reduces the length of the cantilever structure, reduces the force on the throat, and avoids deformation of the hot end assembly 100.

[0055] The embodiment of the present application uses a hot end assembly 100, which includes a heat sink 110, a throat 120, a heating block 130 and a nozzle 140 connected in sequence; a heating seat assembly 200, which is used to heat the heating block 130; and a fixing assembly 300, which is used to detachably connect the hot end assembly 100 with the heating seat assembly 200, and when the hot end assembly 100 is connected with the heating seat assembly 200, the heating block 130 is fixedly attached to the heating seat assembly 200. The hot end assembly 100 and the heating seat assembly 200 are detachably connected by the fixing assembly 300, which facilitates the maintenance and replacement of the hot end assembly 100; and because the heating seat assembly 200 is used to be fixedly connected to the three-dimensional printing head body, the hot end assembly 100 is connected to the printing head body at the heating block 130, so the force on the throat 120 can be reduced, and the possibility of the hot end assembly 100 being bent and damaged by force can be reduced.

[0056] In an optional implementation of the embodiment of the present application, refer to Figure 1 , the fixing assembly 300 is rotatably connected to the heating seat assembly 200; when the fixing assembly 300 is rotated to the first preset position, the fixing assembly 300 squeezes the heating block 130 to fit with the heating seat assembly 200.

[0057] In the embodiment of the present application, the fixing component 300 can be rotatably connected to the heating seat component 200, and the fixing component 300 can rotate around its own axis. When the fixing component 300 is rotated to the first preset position, the fixing component 300 can squeeze the heating block 130 to fit the heating seat component 200. The first preset position can be determined according to the type of the fixing component 300. For example, if the fixing component 300 is fixed left and right, the first preset position is one of the angles of rotation along the left and right sides. For another example, if the fixing component 300 is fixed up and down, the first preset position is one of the angles of rotation along the upper and lower ends. For example, Figure 3 As shown, the first preset position is the highest rotation position of the fixing assembly 300 on the heating seat assembly 200. When the fixing assembly 300 rotates to the highest rotation position, the heating block 130 is pressed to fit the heating seat assembly 200, so that the heating seat assembly 200 can heat the heating block 130 more efficiently.

[0058] In addition, when the fixing assembly 300 is rotated to the second preset position, the heating block 130 can be separated from the heating seat assembly 200 .

[0059] In the embodiment of the present application, the fixing component 300 can also rotate to a second preset position, and the second preset position corresponds to the first preset position. The second preset position can be determined according to the type of the fixing component 300. For example, if the fixing component 300 is fixed left and right, the second preset position is one of the angles of rotation along the left and right sides. For another example, if the fixing component 300 is fixed up and down, the first preset position is one of the angles of rotation along the upper and lower ends. When the fixing component 300 is rotated to the second preset position, the heating block 130 is separated from the heating seat assembly 200, so that the heating block 130 can be separated from the heating seat assembly 200 without removing the screws. Figure 1 As shown, when the fixing assembly 300 rotates to the lowest rotation position, the heating block 130 is separated from the heating seat assembly 200 .

[0060] In an optional implementation of the embodiment of the present application, the heating seat assembly 200 is used to be fixedly connected to the 3D printing head body. The 3D printing head refers to the printing head of the 3D printer. Therefore, the hot end assembly 100 is connected to the printing head body at the heating block 130, so the length of the cantilever structure can be reduced, thereby reducing the force on the throat 120 and reducing the possibility of the hot end assembly 100 being bent and damaged by force.

[0061] In an optional implementation of the embodiment of the present application, refer to Figure 4aThe heating seat assembly 200 is fixedly connected to the 3D printing head body by metal screws, and the heat dissipation fins 110 have magnetic elements 111. When the hot end assembly 100 is fixedly connected to the heating seat assembly 200, the magnetic elements attract the metal screws and fit with the heads of the metal screws.

[0062] The heating seat assembly 200 is fixedly connected to the three-dimensional printing head body by a metal screw, and the metal screw passes through the three-dimensional printing head body and the heating seat assembly 200 to fix the connection between the three-dimensional printing head body and the heating seat assembly. The heating seat assembly 200 is provided with a corresponding hole, which is connected to the metal screw. The heat sink 110 has a magnetic element, which can be a permanent magnet or an electromagnet, which is not limited in the embodiment of the present application. When the hot end assembly 100 is fixedly connected to the heating seat assembly 200, the magnetic element fits with the head of the metal screw based on its own magnetic field. This method enhances the pre-positioning effect of the hot end assembly 100 and the heating seat assembly before installation, and facilitates the installation of the hot end assembly.

[0063] In an optional implementation of the embodiment of the present application, the heating block 130 has a first plane, and the first plane is in contact with the second plane of the heating seat assembly 200 .

[0064] The heating block 130 has a first plane, which is a flat plane. Correspondingly, the heating seat assembly 200 has a second plane that matches the first plane. When the heating seat assembly 200 is attached to the heating block 130, that is, the first plane is attached to the second plane, heat is transferred through the contact between the first plane and the second plane. Heat is transferred based on surface contact, which can improve the efficiency of heat transfer.

[0065] In an optional implementation of the embodiment of the present application, refer to Figure 4b The plane of the heating seat assembly 200 has a first limiting structure. When the first plane is aligned with the second plane, the first limiting structure abuts against the edge of the first plane to limit the relative movement of the heating block 130 and the heating seat assembly 200 in at least one direction parallel to the first plane. This method can improve the pre-positioning effect during installation and increase the positioning effect after installation.

[0066] A first limiting structure may be provided on the plane (which may be the second plane) of the heating seat assembly 200 . The first limiting structure may be a shape limiting structure or a limiting member limiting mechanism, which is not limited in the embodiment of the present application.

[0067] In an optional implementation of the embodiment of the present application, refer to Figure 4cThe first plane has a second limiting structure 131. When the first plane is aligned with the second plane, the second limiting structure 131 abuts against the edge of the second plane to limit the relative movement of the heating block 130 and the heating seat assembly 200 in at least one direction parallel to the first plane. This method can improve the pre-positioning effect during installation and increase the positioning effect after installation.

[0068] Optionally, the direction of relative movement limited by the first limiting structure and the direction of relative movement limited by the second limiting structure 131 may be perpendicular to each other.

[0069] In an optional implementation of the embodiment of the present application, the fixing assembly 300 includes:

[0070] The buckle 310 is rotatably connected to the heating seat assembly 200 , and when the buckle 310 is rotated to the first preset position, the buckle 310 is locked and squeezes the heating block 130 to fit the heating seat assembly 200 .

[0071] In the embodiment of the present application, the fixing assembly 300 may include a snap-fit ​​component 310, which is rotatably connected to the heating seat assembly 200. When the snap-fit ​​component 310 is rotated to a first preset position, it is buckled and locked, and the heating block 130 is squeezed to fit the heating seat assembly 200 to fix the heating block 130 and the heating seat assembly 200.

[0072] In an optional implementation of the embodiment of the present application, the heating block 130 has a groove;

[0073] The buckle 310 includes:

[0074] A first sheet metal part 311 is rotatably connected to the heating seat assembly 200;

[0075] A second wire spring 312 is rotatably connected to the first sheet metal part 311, and the rotation axis of the first sheet metal part 311 and the rotation axis of the second wire spring 312 are parallel but not overlapped;

[0076] When the first sheet metal part 311 rotates, the second wire spring 312 is driven to buckle into the groove, and when it rotates to the first preset position, the second wire spring 312 presses the heating block 130 with its own elastic force.

[0077] You can refer to Figure 1, the heating block 130 has a groove, the extension direction of the groove is perpendicular to the axial direction of the wire material channel in the hot end assembly 100, such as the wire material channel in the hot end assembly 100 is in the vertical direction, and the groove extends in the horizontal direction. The buckle 310 includes a first sheet metal part 311 and a second wire spring 312. The first sheet metal part 311 is rotatably connected to the heating seat assembly 200, and the first sheet metal part 311 rotates on the heating seat assembly 200 between a preset first position and a preset second position. The extension direction of the second wire spring 312 matches the groove. The second wire spring 312 is rotatably connected to the first sheet metal part 311, and the rotation axis of the first sheet metal part 311 is parallel to but does not overlap with the rotation axis of the second wire spring 312. When the first sheet metal part 311 rotates, the second wire spring 312 is driven to enter the groove, and when it rotates to the first preset position, the second wire spring 312 uses its own elastic force to press the heating block 130 and the heating seat assembly 200 to make the heating block 130 fit the heating seat assembly 200.

[0078] When the first sheet metal member 311 rotates to the second preset position, the second wire spring 312 does not press the heating block 130 , so that the heating block 130 is separated from the heating seat assembly 200 .

[0079] In an optional implementation of the embodiment of the present application, a connection hole is provided on one side of the plane where the heating seat assembly 200 and the heating block 130 are in contact, and a groove portion is provided on the other side;

[0080] The buckle 310 includes:

[0081] An L-shaped wire spring 314, wherein a first straight end of the L-shaped wire spring 314 is connected to the connecting hole so that the L-shaped wire spring 314 is connected to the rotation of the heating seat assembly 200;

[0082] A second sheet metal member 313, wherein the second sheet metal member 313 is rotatably connected to the first straight end of the L-shaped linear spring 314, and the rotation axis of the second sheet metal member 313 is parallel to but not overlapped with the rotation axis of the L-shaped linear spring 314;

[0083] When the second sheet metal 313 rotates to the first preset position, the end of the second sheet metal 313 away from the first straight end is embedded in the groove portion, so that the second sheet metal 313 presses the heating block 130, and the second straight end of the L-shaped linear spring abuts against the second sheet metal 313, and uses its own elastic force to press the end of the second sheet metal 313 embedded in the groove portion.

[0084] Reference Figure 4d, a connecting hole is provided on one side of the plane where the heating seat assembly 200 and the heating block 130 are in contact, and a groove portion is provided on the other side. The snap-fitting member 310 includes: a second sheet metal member 313 and an L-shaped wire spring 314. The L-shaped wire spring 314 includes two straight ends perpendicular to each other, a first straight end and a second straight end. The first straight end is connected to the connecting hole so that the L-shaped wire spring 314 can be rotatably connected to the heating seat assembly 200. Specifically, the first end of the L-shaped wire spring 314 can pass through the connecting hole, and the L-shaped wire spring 314 can rotate freely along the axis of the connecting hole. The second sheet metal member 313 is rotatably connected to the first straight end of the L-shaped wire spring 314, and the rotation axis of the second sheet metal member 313 is parallel to but not coincident with the rotation axis of the L-shaped wire spring 314. The second straight end of the L-shaped wire spring 314 can be used as an operating handle to facilitate user operation.

[0085] When the second sheet metal member 313 rotates to the preset first preset position, the end of the second sheet metal member 313 away from the first straight end is embedded in the groove portion, so that the second sheet metal member 313 and the L-shaped wire spring 314 press the heating block 130 based on their own elastic force, so that the heating block 130 fits the heating seat assembly 200. When the second sheet metal member 313 rotates to the preset second preset position, the second sheet metal member 313 releases the hot end assembly 100, so that the heating block 130 is separated from the heating seat assembly 200.

[0086] In an optional implementation of the embodiment of the present application, the buckle 310 includes:

[0087] A first pressing block 315 is rotatably connected to the heating seat assembly 200;

[0088] A first wire spring 316 is rotatably connected to the heating seat assembly 200, and the rotation axis of the first pressing block 315 is parallel to the rotation axis of the first wire spring 316 and is located on both sides of the plane where the heating seat assembly 200 and the heating block 130 are in contact with each other;

[0089] When the first pressing block 315 and the first wire spring 316 are rotated to the first preset position close to each other, the first pressing block 315 and the first wire spring 316 are engaged, the first wire spring 316 limits the movement of the first pressing block 315 , and the first pressing block 315 presses the heating block 130 .

[0090] In the embodiments of this application, refer to Figure 5 The buckle may include a first pressing block 315 and a first wire spring 316. The first pressing block 315 is rotatably connected to the heating seat assembly 200, and the first wire spring 316 is rotatably connected to the heating seat assembly 200. The rotation axis of the first pressing block 315 and the rotation axis of the first wire spring 316 are parallel and located on both sides of the plane where the heating seat assembly 200 and the heating block 130 are attached. Figure 5As shown, the rotation axis of the first pressing block 315 is located on the left side of the plane where the heating seat assembly 200 and the heating block 130 are attached, and the rotation axis of the first wire spring 316 is located on the right side of the plane where the heating seat assembly 200 and the heating block 130 are attached, and the rotation axis of the first pressing block 315 is parallel to the rotation axis of the first wire spring 316.

[0091] When the first pressing block 315 and the first wire spring 316 are rotated to the first preset position close to each other, the first pressing block 315 and the first wire spring 316 are engaged, the first wire spring 316 limits the movement of the first pressing block 315, and the first pressing block 315 presses the heating block 130 to make the heating block 130 fit with the heating seat assembly 200. When the first pressing block 315 and the first wire spring 316 are rotated away from each other, the first pressing block 315 and the first wire spring 316 are released from being engaged, the first pressing block 315 does not apply force to the heating block 130, and the heating block 130 is separated from the heating seat assembly 200.

[0092] In an optional implementation of the embodiment of the present application, the buckle 310 includes a clamping cam 317 and a cam handle 318 that are fixedly connected.

[0093] When the cam handle 318 rotates to the first preset position, the cam handle 318 drives the clamping cam 317 to press the heating block 130 .

[0094] In the embodiments of this application, reference can be made to Figure 6 The buckle 310 includes a clamping cam 317 and a cam handle 318 that are fixedly connected. Specifically, the clamping cam 317 and the cam handle 318 can be an integrated structure. When the cam handle 318 rotates to the first preset position, the cam handle 318 drives the clamping cam 317 to press the heating block 130. So that the heating block 130 fits the heating seat assembly 200. When the cam handle 318 rotates to the second preset position, the clamping cam 317 does not apply force to the hot end assembly 100, and the heating block 130 is separated from the heating seat assembly 200.

[0095] In an optional implementation of the embodiment of the present application, the heating seat assembly 200 includes:

[0096] A fixing seat 210, used for fixed connection to the 3D printing head body, wherein the fixing seat 210 is made of heat-insulating and high-temperature resistant material;

[0097] The heating seat 220 is fixedly connected to the fixing seat 210 and is detachably connected to the hot end assembly 100 .

[0098] In an optional implementation of the embodiment of the present application, the hot end assembly is detachably connected to the heating seat assembly, including: the heating block is detachably connected to the heating seat assembly.

[0099] In an optional implementation of the embodiment of the present application, the heat dissipation fins are detachably connected to the 3D printing head body.

[0100] In an optional implementation of the embodiment of the present application, the heat sink fin has a feed port, which is an annular protrusion for inserting into the discharge port of the 3D printing head body, so that the hot end structure is stably connected to the 3D printing head body and the wire material is stably transported.

[0101] In the embodiments of this application, reference can be made to Figure 5 and Figure 7 The heating seat assembly 200 may include a fixed seat 210 and a heating seat 220. The fixed seat 210 is fixedly connected to the three-dimensional printing head body to provide a support point for the overall installation. The fixed seat 210 is made of heat-insulating and high-temperature resistant material so that after the fixed seat 210 is connected to the heating seat 220, its own performance is not affected under high temperature conditions. The heating seat 220 is fixedly connected to the fixed seat 210, and is detachably connected to the hot end assembly 100 through the fixing assembly 300. When fixedly connected to the hot end assembly 100, the heating block 130 in the hot end assembly 100 is heated.

[0102] In an optional implementation of the embodiment of the present application, the heating seat 220 includes:

[0103] The heating seat body is fitted with the hot end assembly 100;

[0104] The heater is located between the fixing seat 210 and the heating seat body, and is in close contact with the heating seat body, and is used for heating the heating seat body.

[0105] Specifically, the heating seat 220 specifically includes a heating seat body and a heater. The heating seat body is attached to the hot end assembly 100, specifically, the heating seat body is attached to the heating block 130. The heater is between the heating seat body and the fixed seat 210, and is in close contact with the heating seat body to heat the heating seat body, and then the heating seat body transfers heat to the heating block 130, so that the heating block 130 is heated, and the heating block 130 heats the wire.

[0106] In an optional implementation of the embodiment of the present application, the heating seat 220 further includes:

[0107] The temperature measuring component 230 is located between the fixing seat 210 and the heating seat body, and is used to detect the temperature of the heating seat body.

[0108] At least one temperature measuring component 230 may be provided between the fixing seat 210 and the heating seat body. The temperature measuring component 230 may detect the temperature of the heating seat body and control the temperature of the heating wire based on the temperature so as to more stably control the heating of the wire.

[0109] Reference Figure 8 , shows a schematic diagram of the structure of a 3D printing head according to an embodiment of the present application. The present application also discloses a 3D printing head, including the hot end structure 10 and the 3D printing head body 20 as described above.

[0110] In the embodiment of the present application, the 3D printing head includes a hot end structure 10 and a 3D printing head body 20 , and the hot end structure 10 is fixedly connected to the 3D printing head body 20 .

[0111] Reference Fig. 9 , shows a schematic diagram of the structure of a 3D printer according to an embodiment of the present application. The 3D printer comprises: the above-mentioned 3D printing head 1, a printing platform 3 and a driving device 2, wherein the 3D printing head 1 is arranged above the printing platform 3, and the driving device 2 is used to drive the 3D printing head 1 and the printing platform 3 to generate relative displacement.

[0112] The 3D printing head 1 is arranged above the printing platform 3, and is used to extrude the printing material (wire material) that is heated and melted into a molten state; the feeding device 4 is connected to the feeding end of the 3D printing head 1 to provide wire material for the 3D printing head 1, and the driving device 2 drives the 3D printing head 1 to produce relative displacement between the printing platforms 3, so as to print or construct a 3D model.

[0113] The 3D printing head 1 includes a hot end structure 10 and a 3D printing head body 20, and the 3D printing head body 20 includes a feeding assembly and an extrusion assembly disposed between the feeding assembly and the hot end structure 10. During the feeding process of the feeding device 4, the printing material passes through the feeding assembly and then enters the extrusion assembly, and the extrusion assembly provides the printing material to the hot end structure 10; during the material withdrawal process of the feeding device 4, the 3D printer cuts off the printing material in the 3D printing head 1, and the extrusion assembly withdraws the printing material to the feeding device 4, and the loading and unloading assemblies in the feeding device 4 rewind the withdrawn printing material to the material tray.

[0114] Optionally, the 3D printer may, for example, cut off the printing material between the extrusion component and the hot end structure 10 or may cut off the printing material in the extrusion component, etc. The present application does not limit the position where the 3D printer cuts off the printing material.

[0115] Exemplarily, the 3D printer further includes a printing panel 31, a heat bed 32 and a base 33. The heat bed 32 is disposed on the side of the base 33 facing the hot end structure 10, and the heat bed 32 has a heating function. The printing panel 31 is disposed on the side of the heat bed 32 facing the hot end structure 10, and the heat of the heat bed 32 can be transferred to the printing panel 31, and the hot end structure 10 can extrude the molten printing material onto the printing panel 31.

[0116] In a specific implementation, the 3D printer can adjust the temperature of the hot end structure 10 and the hot bed 32, adjust the temperature of the hot end structure 10 to heat the printing material to a molten state, and adjust the temperature of the hot bed 32 to adhere the printing material extruded by the hot end structure 10 to the printing panel 31. The 3D printing head 1 is slidably connected to the first guide rail 12, and the 3D printing head 1 can move along the length direction of the first guide rail 12, that is, the displacement of the 3D printing head 1 relative to the printing panel 31 along the length direction of the first guide rail 12 is realized, and the hot bed 32 is slidably connected to the second guide rail 13, and the hot bed 32 moves along the length direction of the second guide rail 13, that is, the displacement of the 3D printing head 1 relative to the printing panel 31 along the length direction of the second guide rail 13 is realized, and the length direction of the second guide rail 13 is perpendicular to the length direction of the first guide rail 12. Furthermore, the first guide rail 12 is slidably connected to the third guide rail 14, and the 3D printer can achieve displacement of the 3D printing head 1 relative to the printing panel 31 in a direction perpendicular to the length of the second guide rail 13 and in a direction perpendicular to the length of the first guide rail 12 by moving the first guide rail 12 along the third guide rail 14. That is, the 3D printer can achieve relative displacement between the 3D printing head 1 and the printing panel 31 in three mutually perpendicular directions, thereby printing a 3D object.

[0117] It should be noted that the above terms “first” and “second” are only used for descriptive purposes and should not be understood as indicating or implying relative importance.

Claims

1. A hot end structure, characterized in that: include: The hot end assembly includes a heat sink fin, a throat, a heating block and a nozzle connected in sequence; the heat sink fin is detachably connected to the print head of the 3D printer; A heating seat assembly, used for heating the heating block; The fixing assembly is used to detachably connect the hot end assembly with the heating seat assembly, and when the hot end assembly is connected with the heating seat assembly, the heating block is fixedly attached to the heating seat assembly.

2. The hot end structure according to claim 1, characterized in that: The fixing component is rotatably connected to the heating seat component; when the fixing component is rotated to a first preset position, the fixing component squeezes the heating block to fit the heating seat component.

3. The hot end structure according to claim 2, characterized in that: When the fixing assembly is rotated to the second preset position, the heating block can be separated from the heating seat assembly.

4. The hot end structure according to any one of claims 1 to 3, characterized in that: The heating seat assembly is used for fixedly connecting to the three-dimensional printing head body.

5. The hot end structure according to claim 4, characterized in that: The heating seat assembly is fixedly connected to the three-dimensional printing head body by metal screws, and the heat dissipation fins have magnetic elements. When the hot end assembly is fixedly connected to the heating seat assembly, the magnetic elements attract the metal screws and fit with the heads of the metal screws.

6. The hot end structure according to any one of claims 1 to 5, characterized in that: The heating block has a first plane, and the first plane is in contact with the second plane of the heating seat assembly.

7. The hot end structure according to claim 6, characterized in that: The plane of the heating seat assembly is provided with a first limiting structure. When the first plane is in contact with the second plane, the first limiting structure abuts against the edge of the first plane to limit the relative movement of the heating block and the heating seat assembly in at least one direction parallel to the first plane.

8. The hot end structure according to claim 6 or 7, characterized in that: A second limiting structure is provided on the first plane. When the first plane is in contact with the second plane, the second limiting structure abuts against an edge of the second plane to limit the relative movement of the heating block and the heating seat assembly in at least one direction parallel to the first plane.

9. The hot end structure according to any one of claims 1 to 8, characterized in that: The fixing assembly comprises: The buckle is rotatably connected to the heating seat assembly, and when the buckle is rotated to the first preset position, the buckle is locked and squeezes the heating block to fit the heating seat assembly.

10. The hot end structure according to claim 9, characterized in that: The buckle comprises: A first pressing block is rotatably connected to the heating seat assembly; a first wire spring, rotatably connected to the heating seat assembly, wherein the rotation axis of the first pressing block and the rotation axis of the first wire spring are parallel and located on both sides of a plane of the heating seat assembly in contact with the heating block; When the first pressing block and the first wire spring are rotated to the first preset position close to each other, the first pressing block and the first wire spring are buckled, the first wire spring restricts the movement of the first pressing block, and the first pressing block presses the heating block.

11. The hot end structure according to any one of claims 4, characterized in that: The heating seat assembly comprises: A fixing seat, used for fixed connection to the three-dimensional printing head body, wherein the fixing seat is made of heat-insulating and high-temperature resistant material; The heating seat is fixedly connected to the fixing seat and detachably connected to the hot end assembly.

12. The hot end structure according to any one of claims 1 to 11, characterized in that: The hot end assembly is detachably connected to the heating seat assembly, including: the heating block is detachably connected to the heating seat assembly.

13. A three-dimensional printing head, characterized in that: It comprises a hot end structure as described in any one of claims 1 to 12 and a three-dimensional printing head body.

14. A three-dimensional printer, characterized in that: It comprises a three-dimensional printing head as described in claim 13, a printing platform and a driving device, wherein the three-dimensional printing head is arranged above the printing platform, the driving device is used to drive the three-dimensional printing head and the printing platform to generate relative displacement, and the three-dimensional printing head is used to extrude materials to print models.

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