Wire extrusion equipment for 3D printer

Abstract

The invention discloses a wire extrusion device for a 3D printer, belonging to the technical field of 3D printers, comprising a main housing, a fixed-axis wheel, a moving-axis wheel assembly and a clamping and feeding assembly, wherein the fixed-axis wheel and the moving-axis wheel are fixedly assembled in the main housing, and the moving-axis wheel assembly comprises a shaft rod, a shaft sleeve, a bracket and a moving-axis wheel, wherein the shaft rod is fixedly arranged in the main housing, the shaft sleeve and the bracket are rotatably sleeved on the shaft rod, and the moving-axis wheel is rotatably assembled on the bracket, the moving-axis wheel is used to cooperate with the fixed-axis wheel to output the wire to the extruder head side, and the clamping and feeding assembly is used to pull the wire to one side of the fixed-axis wheel and the moving-axis wheel. The invention provides a movable moving-axis wheel on one side of the fixed-axis wheel, and monitors the clamping state of the wire in real time, automatically clamps the wire head by using a clamp when the wire is broken, and uses a threading head to pull the wire head again to between the fixed-axis wheel and the moving-axis wheel for connection, thereby eliminating the tedious steps of manual connection.

Description

Technical Field

[0001] The invention belongs to the technical field of 3D printers, and in particular relates to a wire extrusion device for a 3D printer. Background Art

[0002] The extruder of a 3D printer is responsible for conveying and heating the material, and extrusion molding is the process of continuously pressing a rubber material with a certain plasticity through a die to make it a product with a certain cross-sectional shape.

[0003] The working part of the extruder is generally divided into three parts: the feeding section, the hot melt section and the extrusion section. The feeding section is used to control the uniform speed input of the wire. Since some of the wires used contain impurities, they are easily twisted and broken during the traction process, causing the printer to run out of material. Usually, manual wire reconnection is required, which affects the working efficiency of the printer. Summary of the invention

[0004] In view of the deficiencies in the prior art, an embodiment of the present invention aims to provide a wire extrusion device for a 3D printer to solve the problems in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A wire extrusion device for a 3D printer, having a first direction and a second direction relative to each other, the wire extrusion device for the 3D printer comprising a housing component, the housing component comprising a main housing, a feed port and a guide rod, the top of the main housing is provided with a feed port for pre-installed printing wire, the inside of the main housing is fixedly provided with a guide rod along the second direction, and the bottom of the main housing is fixedly equipped with an extrusion head;

[0007] A fixed-axis wheel assembly, the fixed-axis wheel assembly comprising a fixed-axis wheel, the fixed-axis wheel is fixedly assembled in the main housing, and the tooth surface of the outer diameter of the fixed-axis wheel abuts against the wire side;

[0008] A movable shaft wheel assembly, the movable shaft wheel assembly comprising a shaft rod, a shaft sleeve, a bracket and a movable shaft wheel, the shaft rod is fixedly arranged in the main housing, one end of the shaft sleeve is rotatably sleeved on the shaft rod, the other end of the shaft sleeve is fixedly connected to the bracket, the movable shaft wheel is rotatably mounted on the bracket, the tooth surface of the outer diameter of the movable shaft wheel is movably arranged on one side of the wire, the wire is extruded by the fixed shaft wheel and the movable shaft wheel and outputted to the extrusion head side along the second direction, and the movable shaft wheel switches between a crimping state and an empty connection state;

[0009] A clamping and feeding component, which includes a threading head, a material hole, a pushing side plate, a locking side plate and a clamping piece. A material hole is arranged in the middle of the threading head, and the material hole is aligned with the feed port and is used to pass the wire to be printed. Pushing side plates and locking side plates are fixedly connected at both ends of the threading head. The pushing side plates and the locking side plates are both slidably assembled on the guide rod, and the pushing side plates and the main shell body are elastically connected. A clamping piece is also elastically slidably inserted on one side of the threading head, and the clamping piece is inserted in the threading head and movably crimped on the wire.

[0010] As a further solution of the present invention, the fixed-axis wheel assembly also includes a first coupling arm, a second coupling arm and a center shaft rod, one end of the first coupling arm is rotatably mounted on one side of the fixed-axis wheel, the other end of the first coupling arm is rotatably equipped with the center shaft rod, and one end of the second coupling arm is rotatably equipped with a moving axis wheel, and the fixed-axis wheel, the center shaft rod and the moving axis wheel are connected by a synchronous belt transmission.

[0011] As a further solution of the present invention, the driving shaft wheel assembly also includes a starting frame, a fan plate and a spring sheet, one end of the starting frame is fixedly connected to the bracket, and the other end of the starting frame is provided with a fan plate, and the bottom of the fan plate is elastically equipped with a spring sheet.

[0012] As a further solution of the present invention, the dynamic shaft wheel assembly also includes a limit groove, a limit frame and a pin. The limit groove is fixedly arranged in the main shell body, and the limit frame is movably arranged in the main shell body along the first direction, and one end of the limit frame is movably abutted against the bracket, and the other end of the limit frame is fixedly equipped with a pin, and the pin is limitedly slidably inserted in the limit groove.

[0013] As a further solution of the present invention, the wire extrusion device of the 3D printer also includes a reset component, which includes a first transmission wheel, a second transmission wheel, a third transmission wheel, a ratchet tooth, a bevel gear and a screw rod. The first transmission wheel and the third transmission wheel are both fixedly assembled in the main housing, one end of the second transmission wheel is fixedly connected to the sleeve, and the other end of the second transmission wheel is transmission-connected to the first transmission wheel. The outer diameter end of the third transmission wheel is movably provided with a plurality of ratchet teeth, and the ratchet teeth are unidirectionally meshed with the first transmission wheel. One end of the third transmission wheel is also coaxially fixedly assembled with a bevel gear, and the screw rod is fixedly arranged in the main housing along the second direction, one end of the screw rod is meshed with the bevel gear, and the other end of the screw rod is meshed with the locking side plate.

[0014] As a further solution of the present invention, the clamping and conveying assembly also includes a locking head, a central locking plate and an L-shaped locking plate. The locking head is arranged at the end of the clamp, the central locking plate is elastically rotatably assembled on the locking side plate and is movably snap-fitted with the locking head, the L-shaped locking plate is elastically slidably inserted into the main shell body, and one end of the L-shaped locking plate is movably snap-fitted with the locking side plate.

[0015] As a further solution of the present invention, the clamping assembly also includes a trigger plate, a push rod, a trigger disk, a trigger tooth and a side push plate. The trigger plate is elastically rotatably assembled in the main shell body, a push rod is fixedly arranged at one end of the trigger plate, and the push rod is arranged toward the side of the central locking plate. The trigger disk is coaxially fixedly arranged on the trigger plate, and the outer diameter of the trigger disk is provided with a trigger tooth. A side push plate is fixedly arranged at the other end of the trigger plate, and the side push plate is movably abutted against the L-shaped locking plate.

[0016] In summary, compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0017] The present invention provides a movable moving shaft wheel on one side of the fixed shaft wheel and monitors the clamping state of the wire in real time. When the wire is broken, the wire head is automatically clamped by a clamping piece, and the wire head is pulled again between the fixed shaft wheel and the moving shaft wheel by a threading head for connection, thereby eliminating the tedious steps of manual connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A partial cross-sectional view of a wire extrusion device for a 3D printer provided in one embodiment of the present invention.

[0019] Figure 2 It is a schematic structural diagram of a wire extrusion device of a 3D printer provided in one embodiment of the present invention.

[0020] Figure 3 for Figure 2 An enlarged schematic diagram of the figure marked A.

[0021] Figure 4 It is a schematic structural diagram of a driving shaft wheel assembly in a wire extrusion device of a 3D printer provided in an embodiment of the present invention.

[0022] Figure 5 for Figure 4 An enlarged schematic diagram of the figure marked B.

[0023] Figure 6 A schematic diagram of the back structure of a wire extrusion device of a 3D printer provided in one embodiment of the present invention.

[0024] Figure 7 for Figure 6 An enlarged schematic diagram of the figure marked C.

[0025] Figure numerals: 1-shell member, 101-main shell, 102-feed port, 103-guide rod, 2-extrusion head, 3-fixed axis wheel assembly, 301-fixed axis wheel, 302-first coupling arm, 303-second coupling arm, 304-central shaft rod, 4-moving axis wheel assembly, 401-shaft rod, 402-shaft sleeve, 403-bracket, 404-moving axis wheel, 405-starting frame, 406-fan plate, 407-spring sheet, 408-limiting groove, 409-limiting frame, 410-pin, 5-reset member , 501-first transmission wheel, 502-second transmission wheel, 503-third transmission wheel, 504-ratchet teeth, 505-bevel gear, 506-screw rod, 6-clamping and feeding assembly, 601-threading head, 602-material hole, 603-pushing side plate, 604-locking side plate, 605-clamping piece, 606-locking head, 607-central locking plate, 608-L-type locking plate, 609-trigger plate, 610-push rod, 611-trigger disk, 612-trigger tooth, 613-side push plate, 614-side pin. DETAILED DESCRIPTION

[0026] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] See also Figure 1-Figure 7The wire extrusion device of a 3D printer in one embodiment of the present invention comprises a housing component 1, wherein the housing component 1 comprises a main housing 101, a feed port 102 and a guide rod 103, wherein the top of the main housing 101 is provided with a feed port 102 pre-installed with printing wire, the inside of the main housing 101 is fixedly provided with a guide rod 103 along a second direction y, and the bottom of the main housing 101 is fixedly equipped with an extruder 2; a fixed-axis wheel assembly 3, wherein the fixed-axis wheel assembly 3 comprises a fixed-axis wheel 30 1, the fixed-axis wheel 301 is fixedly assembled in the main housing 101, and the tooth surface of the outer diameter of the fixed-axis wheel 301 abuts against the wire side; the dynamic axis wheel assembly 4, the dynamic axis wheel assembly 4 includes a shaft 401, a sleeve 402, a bracket 403 and a dynamic axis wheel 404, the shaft 401 is fixedly arranged in the main housing 101, one end of the sleeve 402 is rotatably sleeved on the shaft 401, and the other end of the sleeve 402 is fixedly connected to the bracket 403, and the bracket 403 is rotatably assembled with A moving shaft wheel 404, the tooth surface of the outer diameter of the moving shaft wheel 404 is movably arranged on one side of the wire, and the wire is output along the second direction y to the extruder head 2 after being extruded by the fixed shaft wheel 301 and the moving shaft wheel 404, and the moving shaft wheel 404 switches between a crimping state and an empty connection state; a clamping and feeding component 6, the clamping and feeding component 6 includes a threading head 601, a material hole 602, a push side plate 603, a locking side plate 604 and a clamping piece 605, and a material hole 602 is arranged in the middle of the threading head 601, The material hole 602 is aligned with the feed port 102 and is used for passing the wire to be printed. The two ends of the threading head 601 are fixedly connected with a pushing side plate 603 and a locking side plate 604. The pushing side plate 603 and the locking side plate 604 are both slidably assembled on the guide rod 103, and the pushing side plate 603 and the main shell 101 are elastically connected. A clip 605 is also elastically slidably inserted on one side of the threading head 601. The clip 605 is inserted in the threading head 601 and movably crimped on the wire.

[0028] In actual application of this embodiment, when the extruder device of the 3D printer is used, the feed port 102 at one end of the main housing 101 is used to pre-load the printing wire to be extruded, and the wire head at the end of the coil passes through the feed port 102 and is fed into the material hole 602 along the second direction y, and is passed through the material hole 602 to between the fixed axis wheel 301 and the moving axis wheel 404. The fixed axis wheel 301 and the moving axis wheel 404 extrude the wire in the driving state and output the wire toward the side of the extruder head 2, so that the wire is melted in the inner cavity of the extruder head 2 and then passes through the material hole 602. When the wire is discharged from the extruder, when the fixed-axis wheel 301 and the moving-axis wheel 404 are pulling the wire, the wire is subjected to excessive force and twisted and broken. At this time, after the wire between the fixed-axis wheel 301 and the moving-axis wheel 404 is separated, the moving-axis wheel 404 switches from the crimping state to the empty state. The sleeve 402 is elastically rotatably assembled on the shaft 401, so that after the wire is separated, the sleeve 402 and the bracket 403 rotate counterclockwise with the shaft 401 as the axis, thereby pulling the moving-axis wheel 404 to move synchronously toward the fixed-axis wheel 301. At the same time, the clip 605 at one end of the threading head 601 is unlocked and pressed toward the inner wall side of the material hole 602 during the sliding process, so that the disconnected wire head is clamped in the material hole 602, and at this time, the lock on one side of the threading head 601 is released at the same time, so that the pushing side plate 603 and the locking side plate 604 slide synchronously on the guide rod 103 along the negative direction of the second direction y, so that the wire clamped in the threading head 601 moves synchronously along the negative direction of the second direction y, and the wire head is inserted into the fixed axis wheel 301 and the movable axis wheel again. 404, at this time, the clamping piece 605 slides away from one side of the material hole 602 synchronously to allow the wire to move smoothly in the material hole 602, and when the wire is clamped into the fixed-axis wheel 301 and the movable-axis wheel 404 again, the movable-axis wheel 404 drives the sleeve 402 to rotate clockwise under the extrusion action. At this time, the locking side plate 604 linked to the sleeve 402 moves in the positive direction of the second direction y under the driving action, so that the locking side plate 604 is reset and locked to the initial position again after rising, so as to facilitate pulling again when the wire breaks later.

[0029] In one case of this embodiment, the shaft side of the fixed-axis wheel 301 is connected to a driving source, and the fixed-axis wheel 301 and the moving-axis wheel 404 rotate in opposite directions in the xoy plane.

[0030] See also Figure 7 In a preferred embodiment of the present invention, the fixed-axis wheel assembly 3 also includes a first coupling arm 302, a second coupling arm 303 and a center shaft 304, one end of the first coupling arm 302 is rotatably mounted on one side of the fixed-axis wheel 301, the other end of the first coupling arm 302 is rotatably equipped with the center shaft 304, and one end of the second coupling arm 303 is rotatably equipped with a moving axis wheel 404, and the fixed-axis wheel 301, the center shaft 304 and the moving axis wheel 404 are connected by a synchronous belt transmission.

[0031] In actual application of this embodiment, the first coupling arm 302 and the second coupling arm 303 are rotatably connected via the central shaft 304, and the fixed-axis wheel 301 and the central shaft 304 as well as the central shaft 304 and the driven-axis wheel 404 are connected via a synchronous belt transmission, so that when the sleeve 402 rotates around the shaft 401 and the center distance between the fixed-axis wheel 301 and the driven-axis wheel 404 changes, the fixed-axis wheel 301 and the driven-axis wheel 404 always maintain a transmission state, and the fixed-axis wheel 301 and the driven-axis wheel 404 rotate in opposite directions.

[0032] See also Figure 4 In a preferred embodiment of the present embodiment, the driving shaft wheel assembly 4 also includes a limit groove 408, a limit frame 409 and a pin 410, the limit groove 408 is fixedly arranged in the main shell 101, the limit frame 409 is movably arranged in the main shell 101 along the first direction x, and one end of the limit frame 409 is movably abutted against the bracket 403, and the other end of the limit frame 409 is fixedly equipped with a pin 410, and the pin 410 is limitedly slidably inserted in the limit groove 408.

[0033] In actual application of this embodiment, the limit groove 408 is fixedly set in the main shell 101, and the limit frame 409 is slidably set along the first direction x, and the pin 410 on one side of the limit frame 409 is limitedly slidably assembled in the limit groove 408, so that when the sleeve 402 rotates around the shaft rod 401 as the axis, when the bracket 403 rotates counterclockwise in the xoy plane, when the moving shaft wheel 404 is close to the side of the fixed shaft wheel 301, the pin 410 slides in the limit groove 408 to the extreme position to limit the moving shaft wheel 404 from abutting against the fixed shaft wheel 301, so as to avoid squeezing and damaging the tooth surfaces of the fixed shaft wheel 301 and the moving shaft wheel 404.

[0034] See also Figure 5 and Figure 6In a preferred embodiment of the present invention, the wire extrusion device of the 3D printer further includes a reset member 5, the reset member 5 includes a first transmission wheel 501, a second transmission wheel 502, a third transmission wheel 503, a ratchet tooth 504, a bevel gear 505 and a screw 506, the first transmission wheel 501 and the third transmission wheel 503 are both fixedly assembled in the main housing 101, one end of the second transmission wheel 502 is fixedly connected to the shaft sleeve 402, and the other end of the second transmission wheel 502 is fixedly connected to the shaft sleeve 402. A transmission wheel 501 is connected for transmission, a plurality of ratchet teeth 504 are movably provided on the outer diameter end of the third transmission wheel 503, and the ratchet teeth 504 are unidirectionally meshed with the first transmission wheel 501, one end of the third transmission wheel 503 is also coaxially fixedly equipped with a bevel gear 505, the screw rod 506 is arranged in the main housing 101 along the second direction y, one end of the screw rod 506 is meshed with the bevel gear 505, and the other end of the screw rod 506 is meshed with the locking side plate 604.

[0035] In actual application of this embodiment, the first transmission wheel 501 and the third transmission wheel 503 are both fixedly arranged in the main housing 101. When the driving shaft wheel 404 is switched from the pressed state to the empty state, the sleeve 402 drives the first transmission wheel 501 to rotate during the rotation process, and at this time, the first transmission wheel 501 and the third transmission wheel 503 are in a non-transmission state. When the driving shaft wheel 404 is switched from the empty state to the pressed state, the sleeve 402 drives the first transmission wheel 501 to rotate during the rotation process, and the first transmission wheel 501 and the third transmission wheel 503 are in a non-transmission state. The wheel 501 is meshed with the ratchet teeth 504 on the surface of the third transmission wheel 503, thereby further driving the bevel gear 505 to rotate. The bevel gear 505 drives the screw rod 506 to rotate during the meshing process, so that the screw rod 506 synchronously meshes and drives the locking side plate 604 to move, so that the locking side plate 604 moves in the positive direction of the second direction y, and when the locking side plate 604 is crimped to one end of the L-shaped locking plate 608, it slides and locks on one side of the L-shaped locking plate 608, thereby resetting the threading head 601 to the initial locking position.

[0036] See also Figure 5 and Figure 6 In a preferred embodiment of the present invention, the clamping and conveying assembly 6 also includes a locking head 606, a central locking plate 607 and an L-shaped locking plate 608, the locking head 606 is arranged at the end of the clamp 605, the central locking plate 607 is elastically rotatably assembled on the locking side plate 604 and is movably engaged with the locking head 606, the L-shaped locking plate 608 is elastically slidably inserted into the main shell 101, and one end of the L-shaped locking plate 608 is movably engaged with the locking side plate 604.

[0037] In actual application of this embodiment, the locking head 606 is arranged at the end of the clip 605 and is elastically buckled with the central locking plate 607. When the central locking plate 607 rotates clockwise under the action of external force, the locking head 606 is detached from one side of the central locking plate 607, and the clip 605 is slid into the material hole 602 to clamp the wire head that has not fallen off.

[0038] In one case of the present embodiment, the clamping and conveying assembly 6 also includes a side pin 614 and a bevel block 615, the side pin 614 is fixedly arranged on one side of the clamp 605, and the bevel block 615 is fixedly arranged in the main shell 101 and is arranged close to the side of the moving shaft wheel 404. When the threading head 601 slides to the side close to the moving shaft wheel 404, the side pin 614 abuts against the inclined wall of the bevel block 615, and causes the clamp 605 to move in the positive direction of the first direction x, and before disengaging from the inclined wall, causes the locking head 606 to be movably engaged in the central locking plate 607, so that the clamp 605 slides out of the material hole 602 to avoid interference with the conveying of the wire.

[0039] See also Figure 2 and Figure 5 In a preferred embodiment of the present invention, the driving shaft wheel assembly 4 also includes a starting frame 405, a fan plate 406 and a spring piece 407, one end of the starting frame 405 is fixedly connected to the bracket 403, and the other end of the starting frame 405 is provided with a fan plate 406, and the bottom of the fan plate 406 is elastically equipped with a spring piece 407, and the clamping assembly 6 also includes a trigger plate 609, a push rod 610, a trigger disk 611, a trigger tooth 612 and a side push plate 613, the trigger plate 609 is elastically rotatably assembled in the main shell 101, one end of the trigger plate 609 is fixedly provided with a push rod 610, and the push rod 610 is arranged toward the side of the central locking plate 607, the trigger plate 609 is coaxially fixedly provided with a trigger disk 611, the outer diameter of the trigger disk 611 is provided with a trigger tooth 612, and the other end of the trigger plate 609 is fixedly provided with a side push plate 613, and the side push plate 613 is movably abutted against the L-shaped locking plate 608.

[0040] In actual application of this embodiment, the starter frame 405 is fixedly connected to the bracket 403 and rotates with the shaft 401 as the axis. When the moving shaft wheel 404 switches from the crimping state to the empty connection state, the starter frame 405 rotates synchronously in the counterclockwise direction, so that the spring piece 407 at the bottom of the fan plate 406 can move against the trigger tooth 612. Since the trigger disk 611 is coaxially fixedly assembled on the trigger plate 609, the spring piece 407 pushes the trigger plate 609 to rotate counterclockwise in the xoy plane when pushing the trigger tooth 612. At this time, the push rod 610 at one end of the trigger plate 609 is preferentially crimped. On the central locking plate 607, so that the central locking plate 607 rotates clockwise in the xoy plane, so that the locking head 606 is unlocked and disengaged from one side of the central locking plate 607, and at the same time, the side push plate 613 is rotated and crimped onto the L-shaped locking plate 608, and pushes the L-shaped locking plate 608 to move in the negative direction of the first direction x, so that the lock on one side of the locking side plate 604 is released. At this time, the pushing side plate 603 pushes the threading head 601 and the locking side plate 604 to move in the negative direction of the second direction y under the action of elastic force, thereby pulling the wire head again between the fixed axis wheel 301 and the moving axis wheel 404.

[0041] The above embodiment of the present invention provides a wire extrusion device for a 3D printer, which is provided with a movable moving shaft wheel 404 on one side of the fixed shaft wheel 301, and monitors the clamping state of the wire in real time, automatically clamps the wire head with a clamp 605 when the wire is broken, and uses a threading head 601 to pull the wire head again between the fixed shaft wheel 301 and the moving shaft wheel 404 for connection, thereby eliminating the tedious steps of manual connection.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wire extrusion device for a 3D printer, the wire extrusion device for the 3D printer having a first direction and a second direction relative to each other, characterized in that: The wire extrusion equipment of the 3D printer includes: A housing component, the housing component comprising a main housing, a feed port and a guide rod, the top of the main housing is provided with a feed port for pre-installed printing wire, the inside of the main housing is fixedly provided with a guide rod along the second direction, and the bottom of the main housing is fixedly equipped with an extruder head; A fixed-axis wheel assembly, the fixed-axis wheel assembly comprising a fixed-axis wheel, the fixed-axis wheel is fixedly assembled in the main housing, and the tooth surface of the outer diameter of the fixed-axis wheel abuts against the wire side; A movable shaft wheel assembly, the movable shaft wheel assembly comprising a shaft rod, a shaft sleeve, a bracket and a movable shaft wheel, the shaft rod is fixedly arranged in the main housing, one end of the shaft sleeve is rotatably sleeved on the shaft rod, the other end of the shaft sleeve is fixedly connected to the bracket, the movable shaft wheel is rotatably mounted on the bracket, the tooth surface of the outer diameter of the movable shaft wheel is movably arranged on one side of the wire, the wire is extruded by the fixed shaft wheel and the movable shaft wheel and outputted to the extrusion head side along the second direction, and the movable shaft wheel switches between a crimping state and an empty connection state; A clamping and feeding component, the clamping and feeding component includes a material threading head, a material hole, a push side plate, a locking side plate and a clamping piece. A material hole is arranged in the middle of the material threading head, and the material hole is arranged in alignment with the feed port for passing the wire to be printed. The two ends of the material threading head are fixedly connected with a push side plate and a locking side plate. The push side plate and the locking side plate are both slidably assembled on the guide rod, and the push side plate and the main shell body are elastically connected. A clamping piece is also elastically slidably inserted on one side of the material threading head, and the clamping piece is inserted in the material threading head and movably crimped on the wire. The driving shaft wheel assembly also includes a starting frame, a fan plate and a spring sheet. One end of the starting frame is fixedly connected to the bracket, and the other end of the starting frame is provided with a fan plate. The bottom of the fan plate is elastically equipped with a spring sheet. The clamping and feeding assembly also includes a locking head, a central locking plate and an L-shaped locking plate, wherein the locking head is arranged at the end of the clamping piece, the central locking plate is elastically rotatably assembled on the locking side plate and is movably buckled with the locking head, the L-shaped locking plate is elastically slidably inserted into the main housing, and one end of the L-shaped locking plate is movably buckled with the locking side plate; The clamping and conveying assembly also includes a trigger plate, a push rod, a trigger disk, a trigger tooth and a side push plate. The trigger plate is elastically rotatably assembled in the main shell, a push rod is fixedly arranged at one end of the trigger plate, and the push rod is arranged toward the side of the central locking plate. The trigger disk is coaxially fixedly arranged on the trigger plate, and the outer diameter of the trigger disk is provided with a trigger tooth. The other end of the trigger plate is fixedly provided with a side push plate, and the side push plate is movably abutted against the L-shaped locking plate.

2. A wire extrusion device for a 3D printer according to claim 1, characterized in that: The fixed-axis wheel assembly also includes a first coupling arm, a second coupling arm and a center shaft rod. One end of the first coupling arm is rotatably sleeved on one side of the fixed-axis wheel, the other end of the first coupling arm is rotatably equipped with the center shaft rod, and one end of the second coupling arm is rotatably equipped with a moving axis wheel. The fixed-axis wheel, the center shaft rod and the moving axis wheel are connected by a synchronous belt transmission.

3. The wire extrusion device for a 3D printer according to claim 1, characterized in that: The movable shaft wheel assembly also includes a limit groove, a limit frame and a pin. The limit groove is fixedly arranged in the main housing, and the limit frame is movably arranged in the main housing along a first direction, and one end of the limit frame is movably abutted against the bracket, and the other end of the limit frame is fixedly equipped with a pin, and the pin is limitedly slidably inserted in the limit groove.

4. The wire extrusion device for a 3D printer according to claim 1, characterized in that: The wire extrusion device of the 3D printer also includes a reset component, which includes a first transmission wheel, a second transmission wheel, a third transmission wheel, a ratchet tooth, a bevel gear and a screw rod. The first transmission wheel and the third transmission wheel are both fixedly mounted in the main housing, one end of the second transmission wheel is fixedly connected to the shaft sleeve, and the other end of the second transmission wheel is transmission-connected to the first transmission wheel. The outer diameter end of the third transmission wheel is movably provided with a plurality of ratchet teeth, and the ratchet teeth are unidirectionally meshed with the first transmission wheel. One end of the third transmission wheel is also coaxially fixedly mounted with a bevel gear, and the screw rod is fixedly arranged in the main housing along the second direction, one end of the screw rod is meshed with the bevel gear, and the other end of the screw rod is meshed with the locking side plate.

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