CN214983263U - 3D prints extrusion device and 3D printer - Google Patents

Abstract

The utility model belongs to the technical field of 3D prints, a 3D prints extrusion device and 3D printer is disclosed, the 3D printer includes the box body, including a motor, an end cap, a controller, and a cover plate, the chamber is extruded to inside having of box body, the motor sets up on the box body, it includes first gear to extrude the subassembly, the second gear, rotating member and elastic component, the one end of rotating member is rotated and is set up in the inner wall of extruding the chamber, the other end of rotating member passes through elastic component swing joint in the inner wall of extruding the chamber, first gear is connected with the output transmission of motor, and rotate and set up in the rotating member, the second gear is configured to can interlock jointly with first gear and extrude the material, the spanner rotates and sets up in the lateral wall of box body, and support and lean on the tip that is connected with the elastic component on the rotating member, the spanner is configured to drive the rotating member and rotates and predetermines angle and locking rotating member. The spanner is rotated, so that the first gear and the second gear are kept in an open state, the feeding can be completed by one-hand operation of an operator, and the operation is convenient.

Description

3D prints extrusion device and 3D printer

Technical Field

The utility model belongs to the technical field of 3D prints, especially, relate to a 3D prints extrusion device and 3D printer.

Background

In 3D printing technical field, 3D prints extrusion device and is used for extruding the printing material.

The existing 3D printing extrusion device is meshed and extrudes materials through two extrusion gears. In order to facilitate feeding, one of the extrusion gears is rotatably installed in an inner cavity of the 3D printing extrusion device, and the other extrusion gear is rotatably installed in the inner cavity of the 3D printing extrusion device through the rotating clamp. When the feeding is needed, an operator presses or lifts the rotating clamp with one hand, so that the distance between the axes of the two extrusion gears is increased to be in an open state, the feeding is carried out with the other hand, and the rotating clamp is loosened after the feeding is finished, so that the two extrusion gears are restored to an occlusion state.

Above-mentioned material loading process needs operating personnel bimanualness, wastes time and energy, and the operation is experienced the sense relatively poor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a 3D prints extrusion device to solve current material loading process and need both hands operation, operate inconvenient problem.

To achieve the purpose, the technical proposal adopted by the utility model is that:

a 3D printing extrusion device comprising:

the box body is internally provided with an extrusion cavity;

the motor is arranged on the box body;

the extrusion assembly comprises a first gear, a second gear, a rotating piece and an elastic piece, one end of the rotating piece is rotatably arranged on the inner wall of the extrusion cavity, and the other end of the rotating piece is movably connected to the inner wall of the extrusion cavity through the elastic piece; the first gear is in transmission connection with the output end of the motor and is rotationally arranged on the rotating piece, and the second gear is configured to be capable of being meshed with the first gear together and extruding materials;

the spanner, the spanner rotate set up in the lateral wall of box body, and support lean on be connected with on the rotating member the tip of elastic component, the spanner is configured to can drive the rotating member rotates preset angle and locks the rotating member. Through rotatory spanner, drive the rotating member and rotate preset angle and lock the rotating member for the material loading operation can be accomplished in operating personnel one-hand operation, convenient operation, and labour saving and time saving has improved the operation and has experienced the sense.

Preferably, the 3D printing extrusion device further comprises a transmission assembly, the transmission assembly comprises a first worm wheel, a first worm, a second worm wheel and a second worm, the first worm and the second worm are both in transmission connection with the output end of the motor, the rotation directions of the first worm and the second worm are opposite, and the first worm wheel is meshed with the first worm and is connected with the first gear; the second worm wheel is meshed with the second worm and is connected with the second gear. First gear and second gear are the action wheel for 3D prints extrusion device and has great extrusion dynamics, makes the extrusion material sufficient, is favorable to guaranteeing printing quality.

Preferably, the transmission assembly further comprises a first rotating shaft and a second rotating shaft, the first worm wheel and the first gear are fixedly mounted on the first rotating shaft, and two ends of the first rotating shaft are rotatably connected to the rotating member; the second worm wheel and the second gear are fixedly arranged on the second rotating shaft, and two ends of the second rotating shaft are rotatably connected to the inner wall of the extrusion cavity. The first worm wheel and the first gear as well as the second worm wheel and the second gear can smoothly rotate, so that the transmission resistance is reduced, and the extrusion force is favorably enhanced.

Preferably, the rotating member includes a support and an extension plate, one end of the support rotates and set up in extrude the inner wall in chamber, the other end of support is provided with the extension plate, first gear rotate set up in the support, the elastic component is the extension spring, the one end of extension spring with the other end of support or the extension plate links to each other, the other end of extension spring with extrude the inner wall in chamber and link to each other. The extension plate shortens the size of the bracket, simplifies the structure of the rotating piece and reduces the space of the extrusion cavity occupied by the rotating piece.

Preferably, the box body is including covering the upper cover in extruding the chamber, the lateral wall of upper cover has dodges the groove, the extension board is worn to locate movably dodge the groove, and can be in under the drive of spanner dodge the inslot rotation. The upper cover lid fits and extrudes the chamber to improve the leakproofness of box body, avoid outside impurity or dust to get into and extrude the chamber, the contaminated material is convenient for extrude the condition in chamber through opening the upper cover observation.

Preferably, the wrench comprises a bite plate and a feeding plate, one end of the bite plate is connected to the feeding plate at an included angle, the other end of the bite plate is rotatably arranged on the side wall of the box body and can rotate between a bite position and a feeding position, when the wrench rotates to the bite position, the extension plate abuts against the bite plate, and the first gear and the second gear are meshed together and extrude a material; when the spanner rotates to the material loading position, the extension plate abuts against the material loading plate, and the first gear and the second gear are opened. Through rotating the spanner for the spanner switches between interlock position and material loading position, extrudes with the material loading operation with the realization 3D prints extrusion device.

Preferably, the bite plate is vertically connected to the upper plate. The upper surface of the bite plate is completely attached to the lower surface of the extension plate, so that the stability of the rotating part is improved, and the stability of the engagement of the first gear and the second gear is ensured. The last flitch of vertical setting can laminate in the surface of box body, has reduced 3D and has printed extrusion device's occupation space.

Preferably, the wrench further comprises an operating plate, the operating plate is connected with one end, away from the bite plate, of the feeding plate, and the operating plate, the feeding plate and the bite plate are connected to form a Z-shaped plate. The operating panel is moved to facilitate the rotation of the wrench, so that the operation experience is improved.

Preferably, the 3D printing extrusion device further comprises a feeding connector and a feeding conduit, the feeding connector is disposed on the box body, one end of the feeding conduit is communicated with the feeding connector, and the other end of the feeding conduit is used for guiding the material to the meshing position of the first gear and the second gear. The occlusion and the conveying of the extruded materials are convenient.

An object of the utility model is to provide a 3D printer to solve current material loading process and need both hands operation, operate inconvenient problem.

To achieve the purpose, the technical proposal adopted by the utility model is that:

A3D printer comprises the 3D printing extrusion device.

The utility model has the advantages that:

the utility model provides a 3D prints extrusion device and 3D printer, through rotatory spanner, drive the rotating member and rotate preset angle and locking rotating member to enlarge the axle center interval of first gear and second gear, and make the first gear and the second gear remain stable state of opening, the material loading operation can be accomplished in operating personnel one-hand operation, convenient operation, labour saving and time saving has improved the operation and has experienced the sense.

Drawings

Fig. 1 is a schematic structural diagram of a 3D printing extrusion device provided by an embodiment of the present invention;

fig. 2 is an exploded view of a 3D printing extrusion device provided by an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a 3D printing extrusion device for opening an upper cover according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a 3D printing extrusion device that opens an upper cover and removes a rotating member, a first worm wheel, a first worm, a first gear and a wrench.

The component names and designations in the drawings are as follows:

1. a box body; 11. an upper cover; 111. an avoidance groove; 12. mounting a plate; 13. mounting grooves; 2. a motor; 31. a first gear; 32. a second gear; 4. a rotating member; 41. a support; 411. a first rotating shaft; 42. an extension plate; 51. a first worm gear; 52. a second worm gear; 53. a first worm; 54. a second worm; 55. a second rotating shaft; 6. a wrench; 61. a bite plate; 62. feeding plates; 63. an operation panel; 7. a tension spring; 8. a feed connection; 9. a feed conduit.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

This embodiment discloses a 3D printer, this 3D printer include that 3D prints extrusion device, and 3D prints extrusion device and is used for extruding the printing material.

At present, the 3D printing extrusion device is through two extrusion gear engagements and extruded material, and one extrusion gear rotates and installs the inner chamber at 3D printing extrusion device, and another extrusion gear rotates through rotating to press from both sides and installs the inner chamber at 3D printing extrusion device. When the 3D printing extrusion device is used for feeding, an operator needs to press or lift the rotating clamp with one hand, so that the two extrusion gears are in an open state, namely, the distance between the axes of the two extrusion gears is increased, and the feeding is carried out with the other hand. This material loading process needs operating personnel bimanualness, wastes time and energy, and the operation is experienced the sense relatively poor.

In order to solve the above problem, as shown in fig. 1 to 4, the present embodiment further discloses a 3D printing extrusion apparatus, where the 3D printing extrusion apparatus includes a box body 1, a motor 2, and an extrusion assembly. The box body 1 is internally provided with an extrusion cavity for accommodating an extrusion assembly. The motor 2 is arranged on the box body 1 and used for providing extrusion power for the extrusion assembly.

The extrusion assembly comprises a first gear 31, a second gear 32, a rotating part 4 and an elastic part, one end of the rotating part 4 is rotated and arranged on the inner wall of the extrusion cavity, the other end of the rotating part 4 is movably connected with the inner wall of the extrusion cavity through the elastic part, the first gear 31 is in transmission connection with the output end of the motor 2, the first gear 31 is rotated and arranged on the rotating part 4, and the second gear 32 can be jointly meshed with the first gear 31 and extrude materials.

The elastic member of this embodiment may be a tension spring 7.

In order to realize that the operator finishes feeding with one hand, the first gear 31 and the second gear 32 only need to be kept in a stable opening state. Consequently, this 3D prints extrusion device still includes spanner 6, and spanner 6 rotates and sets up in the lateral wall of box body 1, and supports to lean on the tip that is connected with extension spring 7 on swivel member 4, and spanner 6 can drive swivel member 4 and rotate preset angle and lock swivel member 4.

The operating personnel drives the rotating part 4 to rotate by a preset angle and lock the rotating part 4 through the rotating wrench 6, the axle center distance between the first gear 31 and the second gear 32 is enlarged, the first gear 31 and the second gear 32 are kept stably in an open state, the operating personnel only needs to use one hand to complete the feeding operation, the operation is convenient, the time and the labor are saved, and the operation experience is improved.

The box body 1 of this embodiment includes four curb plates and upper cover 11, and wherein four curb plates link to each other in proper order and enclose into square extrusion chamber, and the chamber is extruded in the lid of upper cover 11 fits to improve the leakproofness of box body 1, avoid outside impurity or dust to get into and extrude the chamber, the contaminated material. Specifically, upper cover 11 passes through screw detachably and installs in extruding the chamber, is convenient for extrude the chamber in box body 1's extrusion of subassembly installation, can also observe the material through opening upper cover 11 and extrude the condition.

As shown in fig. 1 and 2, the box body 1 further comprises a mounting plate 12, the mounting plate 12 is positioned below the extrusion chamber, and the mounting plate 12 is detachably mounted on the bottom of the box body 1. A through hole communicated with the extrusion cavity is formed in the middle of the mounting plate 12, the motor 2 is located below the box body 1, and an output shaft of the motor 2 penetrates through the through hole and is in transmission connection with the extrusion assembly. The motor 2 is detachably mounted on the mounting plate 12 by screws so as to facilitate the mounting and maintenance of the motor 2.

The fixed orifices have all been seted up to four corner positions of the mounting panel 12 of this embodiment, have strengthened the installation intensity between motor 2 and the mounting panel 12, have realized the firm installation of motor 2 and box body 1.

As shown in fig. 2 to 4, the 3D printing extrusion apparatus further includes a transmission assembly, and the transmission assembly includes a first worm wheel 51, a first worm 53, a second worm wheel 52, and a second worm 54. The first worm 53 and the second worm 54 are both in transmission connection with the output end of the motor 2, and the rotation directions of the first worm 53 and the second worm 54 are opposite. The first worm wheel 51 is engaged with the first worm 53, and the first worm wheel 51 is connected to the first gear 31. The second worm gear 52 is engaged with the second worm 54, and the second worm gear 52 is connected to the second gear 32. Due to the opposite rotation directions of the first worm 53 and the second worm 54, the first gear 31 and the second gear 32 rotate in opposite rotation directions, so that the first gear 31 and the second gear 32 can be engaged and extrude the material when rotating. The mode of extruding the materials has the advantages of small volume and large transmission ratio. First gear 31 and second gear 32 are the action wheel for 3D prints extrusion device and has great extrusion dynamics, and it is sufficient to extrude the material, is favorable to guaranteeing printing quality.

The first worm 53 and the second worm 54 of the present embodiment can be synchronously rotated by the driving of the motor 2. Specifically, the first worm 53 is located above the second worm 54, the first worm wheel 51 is located above the second worm wheel 52, and the first gear 31 is located above the second gear 32. An axial end face of the first gear 31 is connected to an axial end face of the first worm wheel 51 so that the first gear 31 can rotate synchronously with the first worm wheel 51. An axial end face of the second gear 32 is connected to an axial end face of the second worm wheel 52 so that the second gear 32 can rotate synchronously with the second worm wheel 52. The motor 2 is meshed with the first worm 53 through the first worm wheel 51 and meshed with the second worm 54 through the second worm wheel 52, and simultaneously drives the first gear 31 and the second gear 32 to synchronously rotate in opposite directions.

As shown in fig. 3 and 4, the transmission assembly further includes a first rotating shaft 411 and a second rotating shaft 55, the first worm gear 51 and the first gear 31 are fixedly mounted on the first rotating shaft 411, and two ends of the first rotating shaft 411 are rotatably connected to the rotating member 4. The second worm gear 52 and the second gear 32 are fixedly installed on a second rotating shaft 55, and two ends of the second rotating shaft 55 are rotatably connected to the inner wall of the extrusion cavity. The first rotating shaft 411 is rotatably connected to the rotating member 4, so that the first worm wheel 51 and the first gear 31 smoothly rotate on the rotating member 4, the transmission resistance is reduced, and the extrusion force is enhanced. Similarly, the two ends of the second rotating shaft 55 are respectively and rotatably connected to the two opposite side plates of the box body 1, so that the second worm gear 52 and the second gear 32 can smoothly rotate, and the extrusion force is further enhanced.

As shown in fig. 2 and 3, the rotating member 4 includes a bracket 41 and an extension plate 42, one end of the bracket 41 is rotatably disposed on the inner wall of the extrusion chamber, the other end of the bracket 41 is provided with the extension plate 42, the first gear 31 is rotatably disposed on the bracket 41, one end of the tension spring 7 is connected to the other end of the bracket 41 or the extension plate 42, and the other end of the tension spring 7 is connected to the inner wall of the extrusion chamber.

The support 41 of this embodiment is a rectangular frame, a frame of the rectangular frame is provided with a rotating shaft, and is rotatably disposed on one side plate of the extrusion cavity through the rotating shaft, so that the support 41 can smoothly rotate around the axis of the rotating shaft to adjust the distance between the axes of the first gear 31 and the second gear 32, thereby realizing the rapid switching between the engagement state and the opening state of the first gear 31 and the second gear 32, and further enabling the 3D printing extrusion device to extrude a material in the engagement state and complete the feeding in the opening state.

The extension spring 7 of this embodiment remains the state of being stretched all the time, and the pulling force of extension spring 7 makes the rotating member 4 have the trend of downward rotation all the time to make and keep firm interlock state between first gear 31 and the second gear 32, be favorable to guaranteeing to continuously steadily extrude the material. Specifically, be equipped with first connecting pin on the rotating member 4, extrude and be equipped with the second on the curb plate in chamber and connect the nail, the both ends of extension spring 7 are connected respectively in first connecting pin and second and are connected the nail, are convenient for extension spring 7 and rotating member 4 and extrude being connected of the inner wall in chamber.

The extension plate 42 of the present embodiment shortens the size of the bracket 41, simplifies the structure of the rotary member 4, and reduces the space of the extrusion chamber occupied by the rotary member 4. Specifically, extension plate 42 is the rectangular plate, can be with 6 looks adaptations of spanner, is favorable to improving material loading efficiency.

Specifically, the side wall of the upper cover 11 has an avoiding groove 111, and the extension plate 42 is movably inserted into the avoiding groove 111 and can rotate in the avoiding groove 111 by being driven by the wrench 6. Avoid groove 111 through the setting for 3D prints extrusion device and need not to open upper cover 11 at the material loading in-process, makes material loading process simple accurate, has improved the operation and has experienced the sense.

The wrench 6 of this embodiment includes an engagement plate 61 and an upper material plate 62, one end of the engagement plate 61 is connected to the upper material plate 62 at an included angle, and the other end of the engagement plate 61 is rotatably disposed on the side wall of the box body 1 and can rotate between an engagement position and a material loading position. When the wrench 6 is rotated to the engagement position, the extension plate 42 abuts against the engagement plate 61, and the first gear 31 and the second gear 32 are engaged together and extrude the material; when the wrench 6 is rotated to the loading position, the extension plate 42 abuts against the loading plate 62, and the first gear 31 and the second gear 32 are opened. Through rotating spanner 6 for spanner 6 switches between interlock position and material loading position, has realized that 3D prints extrusion device's material and extrudes and the material loading operation.

As shown in fig. 2 and 3, the bite plate 61 and the feeding plate 62 are rectangular plates, a rotating shaft is provided on the bite plate 61, the corresponding side plate of the extrusion cavity has a mounting groove 13 with a top surface recessed inwards to form the bite plate 61, and the side wall of the mounting groove 13 is provided with a blind hole, and two ends of the rotating shaft on the bite plate 61 are respectively rotatably inserted into the corresponding blind holes, so that the wrench 6 can rotate around the rotating shaft on the bite plate 61. This mounting groove 13 is just to setting up with dodging the groove 111, and bite plate 61 is located the below of extending board 42, and under the pulling force effect of extension spring 7, extends board 42 and supports and press in bite plate 61's upper surface for operating personnel is when moving spanner 6, and spanner 6 can drive and extend board 42 synchronous rotation, thereby makes revolving part 4 rotate for box body 1, with the axle center interval between regulation first gear 31 and the second gear 32.

In this embodiment, the engagement plate 61 is vertically connected to the upper plate 62. As shown in fig. 1 and 3, the wrench 6 is located at the engaging position, the engaging plate 61 is horizontally disposed, the upper surface of the engaging plate 61 is flush with the notch of the mounting groove 13, and the upper surface of the engaging plate 61 is completely attached to the lower surface of the extending plate 42, which is beneficial to improving the stability of the rotating member 4, so as to ensure the stable engagement of the first gear 31 and the second gear 32. The material loading plate 62 vertically arranged can be attached to the outer surface of the box body 1, and the occupied space of the 3D printing extrusion device is reduced.

The wrench 6 of the present embodiment further includes an operating plate 63, the operating plate 63 is connected to an end of the feeding plate 62 away from the engaging plate 61, and the operating plate 63, the feeding plate 62 and the engaging plate 61 are connected to form a Z-shaped plate. Operation panel 63 sets up towards the direction slope of keeping away from box body 1, and the operating personnel of being convenient for realizes spanner 6's rotation through moving operation panel 63, is favorable to improving the operation and experiences the sense.

For easy understanding, the single-hand feeding process of the 3D printing extrusion device of the present embodiment is as follows:

the 3D printing extrusion device is located an initial position, the initial position is that the wrench 6 is located an occlusion position, the upper surface of the occlusion plate 61 is attached to the lower surface of the extension plate 42, and the 3D printing extrusion device normally occludes and extrudes a material. When the feeding is needed, an operator moves the operation plate 63 with one hand to enable the wrench 6 and the rotating element 4 to synchronously rotate in the forward direction, and when the feeding plate 62 is in a horizontal state, the extension plate 42 is firmly pressed against the upper surface of the feeding plate 62 under the action of the tension spring 7, so that the rotating element 4 is locked. After the feeding is completed by one hand of an operator, the operation plate 63 is moved by one hand again to enable the wrench 6 and the rotating piece 4 to synchronously rotate reversely, the 3D printing and extruding device quickly returns to the initial position under the action of the tension spring 7, the single-hand feeding operation is realized, and the operation is simple and convenient.

As shown in fig. 4, the 3D printing extrusion device further includes a feeding connector 8 and a feeding conduit 9, the feeding connector 8 is disposed on the box body 1, one end of the feeding conduit 9 is communicated with the feeding connector 8, and the other end of the feeding conduit 9 is used for guiding the material to the meshing position of the first gear 31 and the second gear 32.

In this embodiment, this 3D prints extruder still includes feed connection 8 and feeding pipe 9, and feed connection 8 sets up on extruding box body 1, and the extrusion material passes into through feed connection 8 and extrudes in the chamber. One end of the feeding conduit 9 is communicated with the feeding joint 8, and the other end of the feeding conduit 9 is used for guiding the material to the occlusion part of the first gear 31 and the second gear 32, so that the occlusion and the conveying of the extruded material are facilitated.

The above embodiments have been described only the basic principles and features of the present invention, and the present invention is not limited by the above embodiments, and is not departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. The 3D printing extrusion device is characterized by comprising:

the box body (1), wherein an extrusion cavity is formed inside the box body (1);

the motor (2), the said motor (2) is set up on the said box body (1);

the extruding assembly comprises a first gear (31), a second gear (32), a rotating piece (4) and an elastic piece, one end of the rotating piece (4) is rotatably arranged on the inner wall of the extruding cavity, and the other end of the rotating piece (4) is movably connected to the inner wall of the extruding cavity through the elastic piece; the first gear (31) is in transmission connection with an output end of the motor (2) and is rotationally arranged on the rotating piece (4), and the second gear (32) is configured to be capable of being meshed with the first gear (31) together and extruding materials;

spanner (6), spanner (6) rotate set up in the lateral wall of box body (1), and support and lean on be connected with on swivel member (4) the tip of elastic component, spanner (6) are configured to can drive swivel member (4) rotate preset angle and lock swivel member (4).

2. The 3D printing extrusion device according to claim 1, further comprising a transmission assembly, wherein the transmission assembly comprises a first worm wheel (51), a first worm (53), a second worm wheel (52) and a second worm (54), the first worm (53) and the second worm (54) are in transmission connection with an output end of the motor (2), the rotation directions of the first worm (53) and the second worm (54) are opposite, and the first worm wheel (51) is meshed with the first worm (53) and is connected with the first gear (31); the second worm gear (52) is meshed with the second worm (54) and is connected with the second gear (32).

3. The 3D printing extrusion device according to claim 2, wherein the transmission assembly further comprises a first rotating shaft (411) and a second rotating shaft (55), the first worm gear (51) and the first gear (31) are fixedly mounted on the first rotating shaft (411), and two ends of the first rotating shaft (411) are rotatably connected to the rotating member (4); the second worm gear (52) and the second gear (32) are fixedly arranged on the second rotating shaft (55), and two ends of the second rotating shaft (55) are rotatably connected to the inner wall of the extrusion cavity.

4. The 3D printing extrusion device according to claim 1, wherein the rotating member (4) comprises a support (41) and an extension plate (42), one end of the support (41) is rotatably arranged on the inner wall of the extrusion chamber, the other end of the support (41) is provided with the extension plate (42), the first gear (31) is rotatably arranged on the support (41), the elastic member is a tension spring (7), one end of the tension spring (7) is connected with the other end of the support (41) or the extension plate (42), and the other end of the tension spring (7) is connected with the inner wall of the extrusion chamber.

5. The 3D printing extrusion device according to claim 4, wherein the box body (1) comprises an upper cover (11) covering the extrusion cavity, the side wall of the upper cover (11) is provided with an avoiding groove (111), and the extension plate (42) is movably arranged in the avoiding groove (111) in a penetrating manner and can be driven by the wrench (6) to rotate in the avoiding groove (111).

6. The 3D printing extrusion device according to claim 4, wherein the wrench (6) comprises a bite plate (61) and a feeding plate (62), one end of the bite plate (61) is connected to the feeding plate (62) at an included angle, the other end of the bite plate (61) is rotatably disposed on the side wall of the box body (1) and can rotate between a bite position and a feeding position, when the wrench (6) rotates to the bite position, the extension plate (42) abuts against the bite plate (61), and the first gear (31) and the second gear (32) are meshed together and extrude a material; when the wrench (6) rotates to the loading position, the extension plate (42) abuts against the loading plate (62), and the first gear (31) and the second gear (32) are opened.

7. The 3D printing extrusion device according to claim 6, wherein the bite plate (61) is vertically connected to the upper flitch (62).

8. The 3D printing extrusion device according to claim 6, wherein the wrench (6) further comprises an operation plate (63), the operation plate (63) is connected with one end of the material feeding plate (62) far away from the bite plate (61), and the operation plate (63), the material feeding plate (62) and the bite plate (61) are connected to form a Z-shaped plate.

9. The 3D printing extrusion device according to claim 1, further comprising a feeding connector (8) and a feeding conduit (9), wherein the feeding connector (8) is disposed on the box body (1), one end of the feeding conduit (9) is communicated with the feeding connector (8), and the other end of the feeding conduit (9) is used for guiding the material to the meshing position of the first gear (31) and the second gear (32).

10. 3D printer, characterized in that it comprises a 3D printing extrusion apparatus according to any one of claims 1 to 9.

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