A process of fused deposition manufacturing 3D printer and extrusion device thereof

Abstract

The present invention relates to the field of 3D printing by process fused deposition, and discloses a 3D printer and an extruder thereof, wherein the extruder comprises: a housing; a first feed roller mounted on the housing, the first feed roller being capable of rotating relative to the housing in a horizontal direction; a second feed roller, one end of which is rotatably connected to the housing, the second feed roller being capable of rotating relative to the housing in a horizontal direction; a motor mounted on the housing; and a reducer connected to the other end of the motor and the second feed roller, respectively; wherein the motor drives the second feed roller to rotate relative to the housing in a horizontal direction through the reducer, and the reducer makes the rotation speed of the second feed roller smaller than the rotation speed of the motor. By configuring the reducer between the second feed roller and the motor, the reducer makes the rotation speed of the second feed roller smaller than the rotation speed of the motor, so as to increase the torque of the second feed roller, thereby avoiding the problem that the extruder is easily out of step in a printing state with large resistance.

Description

[Technical field]

[0001] The invention relates to the field of fused deposition modeling three-dimensional printing, and in particular to a fused deposition modeling three-dimensional printer and an extrusion device thereof. [Background technology]

[0002] The fused deposition modeling (FDM) process in 3D printing technology has the advantages of high raw material rate, safe system operation, low maintenance cost, and small warping deformation of the parts. It is widely used in model making fields such as architecture, art, industrial design, and toys.

[0003] In the process of fused deposition modeling 3D printer, the extruder is one of the key components of the entire printer, which determines the printing effect and efficiency. Generally, the extruder extrude the consumables through two push gears, in which the motor directly drives one of the push gears to rotate. However, under the printing state with large resistance, the extruder is easy to lose step, resulting in a decrease in the accuracy of the printed parts. [Summary of the invention]

[0004] In order to solve the above technical problems, an embodiment of the present invention provides a fused deposition modeling 3D printer and an extruder device thereof, wherein the extruder device is not prone to losing step under a printing state with relatively large resistance.

[0005] In order to solve the above technical problems, the embodiments of the present invention provide the following technical solutions:

[0006] On the one hand, an extrusion device is provided for use in a fused deposition modeling process to manufacture a three-dimensional printer, the extrusion device comprising: a housing; a first feed roller, the first feed roller being mounted on the housing and being rotatable relative to the housing in a horizontal lateral direction; a second feed roller, one end of the second feed roller being rotatably connected to the housing and being rotatable relative to the housing in a horizontal lateral direction; a motor, the motor being mounted on the housing; and a reducer, the reducer being respectively connected to the motor and the other end of the second feed roller; wherein the motor drives the second feed roller to rotate relative to the housing in a horizontal lateral direction via the reducer, and the reducer makes the rotation speed of the second feed roller smaller than the rotation speed of the motor.

[0007] In some embodiments, the reducer includes a first gear and a second gear; the first gear is coaxially fixed to the rotating shaft of the motor, and the motor is used to drive the first gear to rotate horizontally relative to the outer shell; the second gear is installed on the outer shell, and the second gear can rotate horizontally relative to the outer shell; the first gear is meshed with the second gear; one end of the second feeding roller is coaxially fixed to the second gear; the outer shell is formed with an inspection port, and the second gear is exposed outside the outer shell through the inspection port.

[0008] In some embodiments, the second gear is installed on the outer shell through a transmission shaft extending horizontally, and the second feed roller is coaxially fixed to the second gear through the transmission shaft; the first sleeve and the second sleeve are respectively provided at both ends of the transmission shaft, and the first sleeve and the second sleeve are respectively embedded in two relative positions of the outer shell; the second feed roller is sleeved on the transmission shaft and coaxially fixed with the transmission shaft; the part of the transmission shaft where the second gear is provided is formed with an annular groove along its circumference, and the part of the transmission shaft where the second gear is provided is formed with an annular boss, and the annular boss cooperates with the annular groove; the part of the transmission shaft where the second gear is provided is also formed with an axis flattening position, and the part of the transmission shaft where the second gear is provided is also formed with a limiting portion, and the limiting portion cooperates with the axis flattening position.

[0009] In some embodiments, the first feeding roller includes a first roller portion, the center line of which extends in a horizontal transverse direction, and a first recessed portion surrounding the first roller portion is formed in a middle portion between two ends of the first roller portion; the second feeding roller includes a second roller portion, the center line of which extends in a horizontal transverse direction, and a second recessed portion surrounding the first roller portion is formed in a middle portion between two ends of the second roller portion; the first roller portion is spaced apart from the second roller portion by a preset distance in a horizontal longitudinal direction, and the first recessed portion is opposite to the second recessed portion in the horizontal longitudinal direction, and the first recessed portion and the second recessed portion form a gap for the belt material to pass through.

[0010] In some embodiments, the first feed roller also includes a first meshing portion, a center line of which extends horizontally, and one end of the first meshing portion is coaxially fixed with one end of the first roller portion; the second feed roller also includes a second meshing portion, a center line of which extends horizontally, and one end of the second meshing portion is coaxially fixed with the second roller portion; the first meshing portion meshes with the second meshing portion.

[0011] In some embodiments, the extruder further comprises a pressure regulating device; the first feed roller is mounted on the housing through the pressure regulating device; the pressure regulating device is used to adjust the position of the first feed roller relative to the second feed roller to adjust the preset distance

[0012] In some embodiments, the pressure regulating device includes a swing arm; the swing arm is vertically arranged, one end of the swing arm is installed on the outer shell, and the swing arm can swing horizontally relative to the outer shell; the first feeding roller is installed in the middle of the swing arm, and the first feeding roller can rotate horizontally relative to the swing arm.

[0013] In some embodiments, the pressure regulating device also includes a threaded fastener, a gasket and a compression spring; the other end of the swing arm is formed with a waist-shaped hole running through it along the horizontal longitudinal direction, and the length direction of the waist-shaped hole is parallel to the length direction of the swing arm; the stud of the threaded fastener passes through the waist-shaped hole and is threadedly connected to the outer shell; the gasket is sleeved on the threaded fastener and is located on the same side of the swing arm as the head of the threaded fastener; the compression spring is sleeved on the threaded fastener and abuts between the gasket and the head of the threaded fastener.

[0014] In some embodiments, the extrusion device further includes a material breakage detection device; the material breakage detection device is installed in the housing and adjacent to the flow channel.

[0015] On the other hand, a 3D printer using fused deposition modeling is provided, comprising the extrusion device as described above.

[0016] Compared with the prior art, in the fused deposition modeling 3D printer and its extruder provided in an embodiment of the present invention, the extruder is configured with a reducer between the second feed roller and the motor. The reducer makes the rotation speed of the second feed roller lower than the rotation speed of the motor, so as to increase the torque of the second feed roller, thereby avoiding the problem of the extruder easily losing step under printing conditions with large resistance, and indirectly improving the accuracy of the printed parts.

Brief Description of the Drawings

[0017] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and the figures in the drawings do not constitute proportional limitations unless otherwise stated.

[0018] Figure 1 A schematic diagram of the structure of an extrusion device provided by one embodiment of the present invention, wherein the packaging structure of the extrusion device is omitted;

[0019] Figure 2 for Figure 1 A disassembled schematic diagram of the extrusion device shown;

[0020] Figure 3 for Figure 1 A schematic structural diagram of a housing of an extrusion device shown, wherein a portion of the housing structure is omitted so that the internal structure of the housing can be shown;

[0021] Figure 4 for Figure 1 A schematic structural diagram of an extrusion mechanism of an extrusion device shown;

[0022] Figure 5 for Figure 1 Another disassembled schematic diagram of the extrusion device shown;

[0023] Figure 6 for Figure 5 A schematic structural diagram of a transmission shaft of an extrusion device shown;

[0024] Figure 7 for Figure 5 A schematic cross-sectional view of the second gear of the extrusion pig farming shown;

[0025] Figure 8 for Figure 2 The schematic diagram of the structure of the extrusion mechanism shown is from another angle;

[0026] Fig. 9 A schematic diagram of the structure of a 3D printer manufactured by fused deposition technology provided in another embodiment of the present invention. [Specific implementation method]

[0027] For ease of understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on another element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to another element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right", "inside", "outside" and similar expressions used in this specification are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0029] See also Figure 1 and Figure 2 , an extrusion device 100 provided in one embodiment of the present invention is used for manufacturing a three-dimensional printer by a process of fused deposition. The extrusion device 100 includes a housing 10, a feeding mechanism 20, a motor 30 and a material breakage detection device 40. The feeding mechanism 20 and the material breakage detection device 40 are both installed in the housing 10, and the motor 30 is installed outside the housing 10.

[0030] The housing 10 is a vertical box-shaped structure as a whole, and a flow channel 11, a cavity 12, a mounting groove 13, a discharge port 14, an axial hole 15 and an inspection port 16 are formed in the housing 10. The flow channel 11 extends along the vertical direction z, and the outlet of the flow channel is formed at the top of the housing 10, and the outlet of the flow channel 11 leads to the cavity 12. The cavity 12 is used to accommodate the feeding mechanism 20. The discharge port 14 is formed at the bottom of the housing 10 and leads to the cavity 12. The mounting groove 13 is adjacent to the flow channel 11, and the mounting groove 13 is used to accommodate the material break detection device 40. The axial hole 15 is formed at the waist of the housing 10, and is used for the rotating shaft of the power supply 30 to pass through to connect the feeding mechanism 20. The inspection port 16 leads to the cavity 12, and the inspection port 16 allows the feeding mechanism 20 to be exposed outside the housing 10, so as to facilitate the inspection, maintenance, and application of lubricating oil to the feeding mechanism 20. In addition, part of the structure of the feeding mechanism 20 is exposed outside the housing 10, making the structure of the entire extrusion device 100 more compact.

[0031] Please also read Figure 3 The housing 10 can be assembled from two covers 10a and 10b. The two covers 10a and 10b jointly form a flow channel 11, a cavity 12, a mounting groove 13 and a discharge port 14. The shaft hole 15 is formed on one of the covers 10a.

[0032] See also Figure 4 The feeding mechanism 20 includes a first feeding roller 22, a second feeding roller 24, a reducer 26 and a pressure regulating device 28. The first feeding roller 22 is mounted on the housing 10 through the pressure regulating device 28, and the first feeding roller 22 can rotate relative to the housing 10 around the horizontal lateral direction x. One end of the second feeding roller 24 is connected to the reducer 26, and the other end of the second feeding roller 24 is connected to the housing 10. The reducer 26 connects the second feeding roller 24 and the motor 30 respectively, and the motor 30 drives the second feeding roller 24 to rotate relative to the housing 10 around the horizontal lateral direction x through the reducer 26, and the reducer 26 makes the rotation speed of the second feeding roller 24 less than the rotation speed of the motor 30.

[0033] The reducer 26 includes a first gear 260 and a second gear 262. The first gear 260 is coaxially fixed to the rotating shaft of the motor 30, and the motor 30 is used to drive the first gear 260 to rotate relative to the housing 10 around the horizontal lateral direction x. The second gear 262 is installed on the housing 10, and the second gear 262 can rotate relative to the housing 10 around the horizontal lateral direction x. The second gear 262 is meshed with the first gear 260. When the motor 30 drives the first gear 260 to rotate around the horizontal lateral direction x, the first gear 260 drives the second gear 262 to rotate around the horizontal lateral direction x together.

[0034] The second gear 262 is exposed outside the housing 10 through the inspection port 16 and protrudes from the housing 10. The second gear 262 is preferably a nylon gear. Nylon has good comprehensive properties, including mechanical properties, heat resistance, wear resistance, chemical resistance and self-lubrication, and has a low friction coefficient, a certain degree of flame retardancy, and is easy to process. Secondly, it has an overload protection function. When the torque is too large, the gear itself is damaged and the power transmission is interrupted, thereby protecting the lower device or personal safety and reducing losses.

[0035] It can be understood that, according to actual conditions, the reducer 26 is not limited to the combination of the first gear 260 and the second gear 262 as mentioned above. For example, the reducer 26 is a combination of a worm gear, or a combination of planetary gears. As long as the motor 30 drives the second feed roller 24 to rotate around the horizontal direction x relative to the housing 10 through the reducer 26, the reducer 26 can make the rotation speed of the second feed roller 24 less than the rotation speed of the motor 30.

[0036] The first feeding roller 22 includes a first roller portion 220 and a first meshing portion 222. The center lines of the first roller portion 220 and the first meshing portion 222 both extend along the horizontal direction x, and one end of the first roller portion 220 is fixedly connected to one end of the first meshing portion 222. A first recessed portion 224 surrounding the first roller portion 220 is formed in the middle of the first roller portion 220, and a vertical stripe texture (not shown) is formed on the surface of the first recessed portion 224 to increase its friction coefficient.

[0037] Similarly, the second feeding roller 24 includes a second roller portion 240 and a second meshing portion 242. The center lines of the second roller portion 240 and the second meshing portion 242 both extend along the horizontal lateral direction x, and one end of the second roller portion 240 is fixedly connected to one end of the second meshing portion 242. A second recessed portion 244 surrounding the second roller portion 240 is formed in the middle of the second roller portion 240, and a vertical stripe texture (not shown) is formed on the surface of the second recessed portion 244 to increase its friction coefficient.

[0038] One end of the second feeding roller 24 is coaxially fixed with the second gear 262, one end of the second roller portion 240 away from the second meshing portion 242 is coaxially fixed with the second gear 262, and one end of the second meshing portion 242 away from the second roller portion 240 is rotatably connected to the housing 10. The second meshing portion 242 meshes with the first meshing portion 222, the first roller portion 220 and the second roller portion 240 are spaced apart by a preset distance d along the horizontal longitudinal direction y, and the second recessed portion 244 is opposite to the first recessed portion 224 along the horizontal longitudinal direction y. The first recessed portion 224 and the second recessed portion 244 enclose a gap s for the strip to pass through.

[0039] Please also read Figures 5 to 7 The second feeding roller 24 and the second gear 262 are coaxially fixed through a transmission shaft 25 extending along the horizontal lateral direction x, and the second gear 262 is installed on the housing 10 through the transmission shaft 25. The first sleeve 250 and the second sleeve 252 are respectively sleeved on both ends of the transmission shaft 25. The first sleeve 250 and the second sleeve 252 are respectively embedded in two relative positions of the housing 10. The second feeding roller 24 and the second gear 262 are both sleeved on the transmission shaft 25. The second feeding roller 24 can be interference-fitted with the transmission shaft 25 to achieve the coaxial fixation of the second feeding roller 24 and the transmission shaft 25. The portion of the transmission shaft 25 where the second gear 262 is sleeved is formed with an annular groove 254 along its circumference, and the portion where the second gear 262 is sleeved on the transmission shaft 25 is formed with an annular boss 2620, and the annular boss 2620 cooperates with the annular groove 254 to achieve the axial fixation of the second gear 262 and the transmission shaft 25. The portion of the transmission shaft 25 where the second gear 262 is sleeved is also formed with an axis flat portion 256, and the portion of the second gear 262 where the transmission shaft 25 is sleeved is also formed with a limiting portion 2622, which cooperates with the axis flat portion 256 to achieve circumferential fixation of the second gear 262 and the transmission shaft 25. The second gear 262 can be directly injection molded on the transmission shaft 25.

[0040] When the second gear 262 rotates around the horizontal transverse direction x, the second gear 262 drives the second roller portion 240 and the second meshing portion 242 to rotate around the horizontal transverse direction x. At the same time, the second meshing portion 242 meshes with the first meshing portion 222, and the first meshing portion 222 and the first roller portion 220 also rotate synchronously, wherein the rotation directions of the first roller portion 220 and the second roller portion 240 are opposite.

[0041] It can be understood that, in the first aspect, according to the actual situation, the positions of the second roller portion 240 and the second meshing portion 242 can be interchanged, that is, the end of the second roller portion 240 away from the second meshing portion 242 is rotatably connected to the housing 10, and the end of the second meshing portion 242 away from the second roller portion 240 is coaxially fixed with the second gear 262. Therefore, as long as one of the second roller portion 240 and the second meshing portion 242 is rotatably connected to the housing 10, the other of the second roller portion 240 and the second meshing portion 242 is coaxially fixed with the second gear 262. In the second aspect, according to the actual situation, the first meshing portion 222 and the second meshing portion 242 can be omitted. After the first meshing portion 222 and the second meshing portion 242 are omitted, the second roller portion 240 rotates around the horizontal lateral direction x to provide power for feeding the strip material, and the first roller portion 220 rotates with the feeding of the strip material.

[0042] Please also read Figure 8 The pressure regulating device 28 is used to adjust the position of the first feeding roller 22 relative to the second feeding roller 24 to adjust the preset distance d. The pressure regulating device 28 includes a swing arm 280, a threaded fastener 282, a gasket 284 and a compression spring 286. The swing arm 280 is basically vertical, one end of the swing arm 280 is mounted on the housing 10, and the swing arm 280 can swing relative to the housing 10 around the horizontal lateral direction x. The first feeding roller 22 is mounted in the middle of the swing arm 280, and the first feeding roller 22 can rotate relative to the swing arm 280 around the horizontal lateral direction x. The other end of the swing arm 280 is formed with a waist-shaped hole 288 that penetrates it along the horizontal longitudinal direction y, and the length direction of the waist-shaped hole 288 is parallel to the length direction of the swing arm 280. The stud of the threaded fastener 282 passes through the waist-shaped hole 288 and is threadedly connected to the housing 10. The gasket 284 is sleeved on the threaded fastener 282 and is located on the same side of the swing arm 280 as the head of the threaded fastener 282. The compression spring 286 is sleeved on the threaded fastener 282 and abuts between the gasket 284 and the head of the threaded fastener 282. When the swing arm 280 swings around the horizontal lateral direction x relative to the housing 10, the preset distance d changes accordingly to change the caliber of the gap formed between the first recessed portion 224 and the second recessed portion 244, thereby adjusting the pressure applied by the first recessed portion 224 and the second recessed portion 244 to the strip.

[0043] One end of the swing arm 280 having a waist-shaped hole 288 may also be formed with a handle 289 to facilitate manual swinging of the swing arm 280 to adjust the preset distance d. It can be understood that, according to actual conditions, the swing arm 280 may also be driven electrically to swing relative to the housing 10.

[0044] It is understandable that, according to actual needs, the pressure regulating device 28 can be omitted. After the pressure regulating device 28 is omitted, the first feeding roller 22 can be directly installed on the housing 10.

[0045] See also Fig. 9 Another embodiment of the present invention provides a 3D printer manufactured by fused deposition. The 3D printer 200 manufactured by fused deposition includes a barrel 50, a vertical guide rail 60, a transverse guide rail 70, a longitudinal guide rail 80, a base 90, a platform 101 and an extrusion device 100 as described above. Two vertical guide rails 60 are erected on the base 90, and the two ends of the transverse guide rail 70 are respectively connected to the two vertical guide rails 60, and the transverse guide rail 70 can move relative to the base 90 in the vertical direction. The extrusion device 100 is installed on the transverse guide rail 70, and the extrusion device 100 can move relative to the base 90 in the horizontal transverse direction. The longitudinal guide rail 80 is installed on the base 90, and the platform 101 is installed on the longitudinal guide rail 80, and the platform 101 can move relative to the base 90 in the horizontal longitudinal direction. The barrel 50 is used to store the tape. Through the vertical guide rail 60, the transverse guide rail 70 and the longitudinal guide rail 80 working together, the extrusion device 100 can perform a 3D printing operation on the platform.

[0046] Compared with the prior art, in the fused deposition modeling 3D printer 200 and its extruder 100 provided in the embodiment of the present invention, the extruder 100 is configured with a reducer 26 between the second feed roller 24 and the motor 30. The reducer 26 makes the rotation speed of the second feed roller 24 lower than the rotation speed of the motor 30, so as to increase the torque of the second feed roller 24, thereby avoiding the problem of the extruder easily losing step under the printing state with large resistance, and indirectly improving the accuracy of the printed parts.

[0047] In addition, by configuring the first meshing portion 222 and the second meshing portion 242 on the first feed roller 22 and the second feed roller 24 respectively, the first feed roller 22 and the second feed roller 24 rotate synchronously, thereby avoiding the problem of the conveyor belt material slipping due to the rotation of a single feed roller.

[0048] In addition, the material breakage detection device 40 is installed in the housing 10. The material breakage detection device 40 is built-in, which will not increase the resistance of the conveyor belt material and has a compact structure.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they may still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An extrusion device (100) for use in a fused deposition modeling process to manufacture a three-dimensional printer (200), characterized in that: The extrusion device (100) comprises: Housing (10); a motor (30), the motor (30) being mounted on the housing (10); and A reducer (26), the reducer (26) comprising a first gear (260) and a second gear (262), the first gear (260) meshing with the second gear (262), the first gear (260) being coaxially fixed to the rotating shaft of the motor (30) so as to rotate relative to the housing (10) around a horizontal transverse direction (x) under the drive of the motor (30), and the second gear (262) being mounted on the housing (10) via a transmission shaft (25) extending along the horizontal transverse direction (x); A feeding mechanism (20), the feeding mechanism (20) being accommodated in the cavity (12) of the housing (10), the feeding mechanism (20) comprising: A first feeding roller (22), the first feeding roller (22) being mounted on the housing (10), the first feeding roller (22) being rotatable relative to the housing (10) about a horizontal transverse direction (x); a second feeding roller (24), the second feeding roller (24) being sleeved on the transmission shaft (25) and being coaxially fixed with the second gear (262), and the rotation speed of the second feeding roller (24) being lower than the rotation speed of the motor (30); The portion of the transmission shaft (25) where the second gear (262) is sleeved is formed with an annular groove (254) along its circumference, and the portion of the transmission shaft (25) where the second gear (262) is sleeved is formed with an annular boss (2620), and the annular boss (2620) cooperates with the annular groove (254); the portion of the transmission shaft (25) where the second gear (262) is sleeved is also formed with an axial flat position (256), and the portion of the transmission shaft (25) where the second gear (262) is sleeved is also formed with a limiting portion (2622), and the limiting portion (2622) cooperates with the axial flat position (256).

2. The extrusion device (100) according to claim 1, characterized in that: The housing (10) is formed with an inspection port (16), and the second gear (262) is exposed outside the housing (10) through the inspection port (16).

3. The extrusion device (100) according to claim 2, characterized in that: The two ends of the transmission shaft (25) are respectively provided with a first shaft sleeve (250) and a second shaft sleeve (252), and the first shaft sleeve (250) and the second shaft sleeve (252) are respectively embedded in two relative positions of the housing (10).

4. The extrusion device (100) according to claim 1, characterized in that: The first feeding roller (22) comprises a first roller portion (220), the center line of the first roller portion (220) extending along a horizontal transverse direction (x), and a first recessed portion (224) surrounding the first roller portion (220) is formed in the middle between the two ends thereof; The second feeding roller (24) comprises a second roller portion (240), the center line of the second roller portion (240) extending along a horizontal transverse direction (x), and a second recessed portion (244) surrounding the second roller portion (240) is formed in the middle between the two ends thereof; The first roller portion (220) is spaced apart from the second roller portion (240) by a preset distance (d) along the horizontal longitudinal direction (y), and the first recessed portion (224) and the second recessed portion (244) are opposite to each other along the horizontal longitudinal direction (y), and the first recessed portion (224) and the second recessed portion (244) form a gap (s) for the strip material to pass through.

5. The extrusion device (100) according to claim 4, characterized in that: The first feeding roller (22) further comprises a first meshing portion (222), the center line of the first meshing portion (222) extending along a horizontal transverse direction (x), and one end of the first meshing portion (222) is coaxially fixed to one end of the first roller portion (220); The second feeding roller (24) further comprises a second meshing portion (242), the center line of the second meshing portion (242) extending along a horizontal transverse direction (x), and one end of the second meshing portion (242) is coaxially fixed to the second roller portion (240); The first meshing portion (222) meshes with the second meshing portion (242).

6. The extrusion device (100) according to claim 4, characterized in that: The extrusion device (100) further comprises a pressure regulating device (28); The first feeding roller (22) is mounted on the housing (10) via the pressure regulating device (28); The pressure regulating device (28) is used to adjust the position of the first feeding roller (22) relative to the second feeding roller (24) to adjust the preset distance (d).

7. The extrusion device (100) according to claim 6, characterized in that: The pressure regulating device (28) comprises a swing arm (280); The swing arm (280) is vertically arranged, one end of the swing arm (280) is mounted on the housing (10), and the swing arm (280) can swing relative to the housing (10) about a horizontal direction (x); The first feeding roller (22) is installed at the middle of the swing arm (280), and the first feeding roller (22) can rotate relative to the swing arm (280) around a horizontal transverse direction (x).

8. The extrusion device (100) according to claim 7, characterized in that: The pressure regulating device (28) further includes a threaded fastener (282), a gasket (284) and a compression spring (286); The other end of the swing arm (280) is formed with a waist-shaped hole (288) penetrating the swing arm along the horizontal longitudinal direction (y), and the length direction of the waist-shaped hole (288) is parallel to the length direction of the swing arm (280); The stud of the threaded fastener (282) passes through the waist-shaped hole (288) and is threadedly connected to the housing (10); The gasket (284) is sleeved on the threaded fastener (282), and is located on the same side of the swing arm (280) as the head of the threaded fastener (282); The compression spring (286) is sleeved on the threaded fastener (282) and abuts between the gasket (284) and the head of the threaded fastener (282).

9. The extrusion device (100) according to any one of claims 1 to 8, characterized in that: The extrusion device (100) further comprises a material breakage detection device (40); The material break detection device (40) is installed in the housing (10) and is adjacent to the flow channel (11).

10. A fused deposition modeling 3D printer (200), characterized in that: The invention comprises the extrusion device (100) according to any one of claims 1 to 9.

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