3D printer extrusion structure

Abstract

an adjustment bracket (140) rotatably connected within the housing (110); a driven push gear (150) provided at one end of the adjustment bracket (140) and rotatably connected to the adjustment bracket (140); and an elastic member (160) connected to the other end of the adjustment bracket (140) for moving one end of the adjustment bracket (140) where the driven push gear (150) is provided, closer to the drive push gear (130) so that the driven push gear (150) and the drive push gear (130) cooperate to complete extrusion. Here, one end of the adjustment bracket (140) where the driven push gear (150) is provided protrudes to the outside of the housing (110).

Description

[Technical field]

[0001] The present application relates to the technical field of 3D printers, and in particular to extrusion structures of 3D printers. [Background technology]

[0002] In a 3D printer, the extrusion structure is located in the nozzle of the 3D printer, which heats the material and extrudes it from the nozzle. The stability of the extrusion structure plays an important role in the printing quality and printing stability. The traditional extrusion structure is not only large in volume and weight, occupies a large space and is expensive, but also has a large volume and weight, which leads to a large load on the printer and is not suitable for near-end and ultra-near-end printing. In addition, some of the traditional extrusion structures adopt single-tooth feed, which is not stable in feeding and has poor feeding stability and accuracy. Summary of the Invention [Problem to be solved by the invention]

[0003] To solve the above technical problems, the present invention provides an extrusion structure for a 3D printer, which has small volume, light mass, stable and accurate feeding, and is easy to operate. [Means for solving the problem]

[0004] To achieve this objective, the present invention adopts the following technical solutions: An extrusion structure for a 3D printer, A housing (110); a motor (120) provided in the housing (110); a driven push gear (130) provided within the housing (110) and connected to the motor (120); an adjustment bracket (140) pivotally coupled within the housing (110); a driven push gear (150) provided at one end of the adjustment bracket (140) and rotatably connected to the adjustment bracket (140); an elastic member (160) connected to the other end of the adjustment bracket (140) for moving the end of the adjustment bracket (140) on which the driven pushing gear (150) is provided, closer to the driving pushing gear (130) so that the driven pushing gear (150) and the driving pushing gear (130) cooperate to complete the pushing; Here, one end of the adjustment bracket (140) where the driven push gear (150) is provided protrudes to the outside of the housing (110).

[0005] As an option for the extrusion structure of the 3D printer, the extrusion structure of the 3D printer further includes a motor gear (170) connected to the motor (120), a gear rotation shaft (180) rotatably coupled within the housing (110), and a reduction gear (190) provided on the gear rotation shaft (180) and meshing with the motor gear (170); The reduction gear (190) has an outer diameter larger than that of the motor gear (170), and the drive push gear (130) is mounted on the gear rotation shaft (180) and rotates coaxially with the reduction gear (190).

[0006] As an option for the extrusion structure of the 3D printer, the extrusion structure of the 3D printer includes a heat dissipation member (200) provided below the driving extrusion gear (130) and the driven extrusion gear (150); A first discharge pipe (210) provided in the heat dissipation member (200) for discharging consumables (101) of the 3D printer; a throat pipe (220) attached to the outside of the first discharge pipe (210) and having one end in contact with the heat dissipation member (200); a first heat dissipation fan (230) and a first air guide member (240) provided in the housing (110), The first air guide member (240) can guide the air blown out of the first heat dissipation fan (230) to the heat dissipation member (200).

[0007] As an option for the extrusion structure of the 3D printer, the extrusion structure of the 3D printer further includes a heating block (250) provided below the heat dissipation member (200), a nozzle (260) provided at the bottom end of the heating block (250), and a heating pipe (270) provided in the heating block (250) for heating the consumable material (101) in the heating block (250); The other end of the throat pipe (220) contacts the heating block (250), The consumable material (101) passes through the heat dissipation member (200) and the heating block (250) in this order, and then is ejected from the nozzle (260).

[0008] As an option for the extrusion structure of the 3D printer, a portion of the outer periphery of the reduction gear (190) penetrates the housing (110) and is exposed to the outside.

[0009] As an option for the extrusion structure of the 3D printer, the extrusion structure of the 3D printer further includes a second heat dissipation fan (280) and a second air guide member (290) provided in the housing (110), The second air guide member (290) guides the air from the second heat dissipation fan (280) to the model below the extrusion structure of the 3D printer.

[0010] As an option for the extrusion structure of the above-mentioned 3D printer, the extrusion structure of the 3D printer further includes a mounting screw (141), a positioning structure (113) for mounting the mounting screw (141) is provided within the housing (110), the mounting screw (141) is provided in the positioning structure (113), and the elastic member (160) is attached so as to surround the mounting screw (141).

[0011] As an option for the extrusion structure of the above-mentioned 3D printer, the other end of the adjustment bracket (140) has a first side and a second side along its rotation direction, the first side is connected to the elastic member (160), and a position regulating structure (142) corresponding to the second side is provided within the housing (110) to regulate the position of the adjustment bracket (140).

[0012] As an option to the extrusion structure of the 3D printer, a thermistor (252) is provided within the heating block (250).

[0013] As an option for the extrusion structure of the 3D printer, the surface of the heating block (250) is covered with a heat insulating material (251).

[0014] The extrusion structure of the 3D printer of the present invention adopts a two-tooth feed method, and the extrusion of consumables is realized by the cooperation of the driving extrusion gear and the driven extrusion gear, so that stable and accurate feeding can be realized. Since the adjustment bracket for mounting the driven extrusion gear extends to the outside of the housing, when it is necessary to insert consumables, the adjustment bracket can be moved from the outside of the housing to separate the driven extrusion gear and the driving extrusion gear, and the consumables can be passed through, which is convenient to operate. At the same time, the extrusion structure of the 3D printer of the present invention has a small volume and a light weight, which can realize the miniaturization and light weight of the extrusion structure, and can be adapted to near-end and ultra-near-end printing. [Brief description of the drawings]

[0015] [Figure 1] 1 is a schematic diagram of the three-dimensional structure of an extrusion structure of a 3D printer according to the present invention. [Diagram 2] 1 is a schematic diagram showing the internal structure of an extrusion structure of a 3D printer according to the present invention. FIG. [Diagram 3] FIG. 2 is a schematic diagram of an exploded view of the extrusion structure of the 3D printer according to the present invention. [Figure 4] FIG. 2 is a front view of the extrusion structure of the 3D printer according to the present invention. [Diagram 5]FIG. 5 is a schematic cross-sectional view taken along line AA in FIG. [Figure 6] FIG. 3 is a front view of the configuration shown in FIG. 2. [Figure 7] 1 is a structural schematic diagram of the extrusion structure of the 3D printer according to the present invention when consumables are input into the extrusion structure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] The present invention will be described in more detail below with reference to the accompanying drawings and examples. The specific embodiments described in this specification are only for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, in order to facilitate the explanation, only parts related to the present invention are shown in the drawings, and the entire structure is not shown.

[0017] The present invention provides an extrusion structure of a 3D printer. With reference to Figs. 1 to 6, the extrusion structure of the 3D printer includes a housing 110, a motor 120, a driving extrusion gear 130, an adjustment bracket 140, a driven extrusion gear 150, and an elastic member 160. The housing 110 may include a front case 111 and a rear case 112. Of course, the number of components of the housing 110 can be adjusted as needed. For example, the housing 110 may include a multi-stage case spliced ​​together, and is not limited here.

[0018] The motor 120 is installed in the housing 110. In one embodiment, the motor 120 is installed at the rear and outside of the housing 110. The housing 110 is positioned and mounted through a positioning hole in the housing of the motor 120. The rotor of the motor 120 is inserted into the inside of the housing 110. The driving pushing gear 130 is installed in the housing 110 and connected to the rotor of the motor 120 so that the motor 120 drives the driving pushing gear 130 to rotate. The driving pushing gear 130 and the motor 120 may be directly connected or indirectly connected through another intermediate transmission structure. In the present invention, the driving pushing gear 130 and the motor 120 are indirectly connected.

[0019] The adjustment bracket 140 is rotatably connected within the housing 110. As shown in FIG. 2 and FIG. 3, the adjustment bracket 140 is rotatably connected to the housing 110 via a first pivot pin 131, allowing the adjustment bracket 140 to rotate around a pivot axis 132. Preferably, one end of the first pivot pin 131 is supported by the front case 111, and the other end of the first pivot pin 131 is supported by the rear case 112. As shown in FIG. 6, the driven pushing gear 150 is provided at one end of the adjustment bracket 140 and is rotatably connected to the adjustment bracket 140. The driven pushing gear 150 can rotate in the adjustment bracket 140 to realize feeding. The elastic member 160 is connected to the other end of the adjustment bracket 140, and one end of the adjustment bracket 140 where the driven extrusion gear 150 is provided can be brought close to the driving extrusion gear 130 to compress the consumable material 101, and the driven extrusion gear 150 and the driving extrusion gear 130 can be combined to complete the extrusion. The consumable material 101 is tightly clamped between the driving extrusion gear 130 and the driven extrusion gear 150, and is extruded outward with the rotation of the hub. The extrusion structure of the 3D printer of the present invention uses a two-tooth feed method combining the driving extrusion gear 130 and the driven extrusion gear 150, making the feeding smoother and more accurate.

[0020] As shown in FIG. 4 and FIG. 6, the adjustment bracket 140 is formed with a dial lever that protrudes from one side of the driven push gear 150 to the outside of the housing 110 and is located outside the housing 110. The dial lever is rotated to move the adjustment bracket 140, and the adjustment bracket 140 is rotated clockwise around the rotation axis 132. In this manner, as shown in FIG. 7, the driven push gear 150 and the driving push gear 130 are separated, so that the consumable material 101 can be inserted between the driven push gear 150 and the driving push gear 130. In the process of rotating the adjustment bracket 140, the elastic member 160 is compressed. After the insertion of the consumable material 101 is completed, the adjustment bracket 140 is released. Then, the adjustment bracket 140 is reset by the elastic force of the elastic member 160, and the driven push gear 150 and the driving push gear 130 are recombined to clamp the consumable material 101, and feeding can be started. That is, the extrusion structure of the 3D printer of the present invention can realize the material passing operation by simply moving the part of the adjustment bracket 140 located outside the housing 110, which is convenient and quick. At the same time, the extrusion structure of the 3D printer of the present invention is small in volume and light in weight, which can realize the miniaturization and light weight of the extrusion structure, and can be adapted to near-end and ultra-near-end printing.

[0021] 3 and 6, the driven push gear 150 is rotatably connected to the adjustment bracket 140 via a second pivot pin 151. Specifically, both ends of the second pivot pin 151 are supported on two front and rear side surfaces of the adjustment bracket 140, respectively. After a first plastic flange bearing 152 and a second plastic flange bearing 153 are press-fitted into both front and rear ends of the driven push gear 150, the second pivot pin 151 is inserted into the driven push gear 150.

[0022] As shown in FIG. 6, the extrusion structure of the 3D printer of the present invention further includes a mounting screw 141. A positioning structure 113 for mounting the mounting screw 141 is provided inside the housing 110, and the mounting screw 141 is provided in the positioning structure 113. The elastic member 160 can be a spring. The spring is attached to surround the mounting screw 141 and is guided along the mounting screw 141. As shown in FIG. 6, one end of the spring is attached to the mounting screw 141, and the other end of the spring is abutted against the adjustment bracket 140. The spring presses the adjustment bracket 140 against the driving extrusion gear 130. When passing the material, the driven extrusion gear 150 and the driving extrusion gear 130 can be separated by simply pressing the adjustment bracket 140 in the direction indicated by the arrow in FIG. 6, and the consumable material 101 can pass between them. During compression, the spring is compressed, and when the adjustment bracket 140 is released, the adjustment bracket 140 is reset by the elastic return force of the spring.

[0023] Continuing to refer to FIG. 6, one end of the adjustable bracket 140 connected to the elastic member 160 has a first side and a second side along its rotation direction, and the first side is connected to the elastic member 160. A position regulating structure 142 is provided on the aforementioned second side in the housing 110 to restrict the position of the adjustable bracket 140. In this embodiment, as shown in FIG. 6, the position regulating structure 142 is a stopper wall surface, which stops the adjustable bracket 140 and defines the extrusion limit position so as to prevent the material from being cut off due to the spring pressing the adjustable bracket 140 against the driving extrusion gear 130 too much. At the same time, the spring allows the adjustable bracket 140 to have a certain pressing force, and prevents the planing caused by the pressing force being too small.

[0024] As shown in FIG. 3, the extrusion structure of the 3D printer further includes a motor gear 170, a gear rotating shaft 180, and a reduction gear 190. The motor gear 170 is connected to the rotor of the motor 120. The gear rotating shaft 180 is rotatably connected inside the housing 110. Specifically, as shown in FIG. 3, the gear rotating shaft 180 is rotatably connected inside the housing 110 via a bearing 181. The reduction gear 190 is provided on the gear rotating shaft 180 and meshes with the motor gear 170. The outer diameter of the reduction gear 190 is larger than the outer diameter of the motor gear 170. As a result, the motor gear 170 with a small diameter and the reduction gear 190 with a large diameter mesh with each other to form one-stage reduction. The main drive extrusion gear 130 is provided on the gear rotating shaft 180 and rotates coaxially with the reduction gear 190. After reduction, the reduction gear 190 transmits torque to the main drive extrusion gear 130 provided coaxially via the gear rotating shaft 180. The driving extrusion gear 130 cooperates with the driven extrusion gear 150 to extrude the consumable material 101. By adopting only one stage of reduction, the extrusion structure of the entire 3D printer is simplified, the volume is reduced, the mass is light, and the printer is compact and lightweight. At the same time, with fewer reduction levels and only one stage, a large torque output can be achieved with a small motor.

[0025] 1, a part of the outer periphery of the reduction gear 190 protrudes outside the housing 110, so that the reduction gear 190 can be rotated from outside the housing 110. When passing the material, the reduction gear 190 is rotated to assist the entry of the consumable material 101 into the extrusion structure of the 3D printer.

[0026] As shown in FIG. 2, FIG. 3 and FIG. 5, the extrusion structure of the 3D printer according to the present invention further includes a heat dissipation member 200, a first exhaust pipe 210, a throat pipe 220, a first heat dissipation fan 230 and a first air guide member 240. The heat dissipation member 200 is disposed below the driving extrusion gear 130 and the driven extrusion gear 150, and is located in the housing 110. The heat dissipation member 200 is integrated into the housing 110, that is, the heat dissipation member 200 is integrated into the entire extrusion structure of the 3D printer. However, in the prior art, the heat dissipation member and the extrusion structure of the 3D printer are separated. The integrated structure design of the present invention, which integrates the heat dissipation member 200 into the extrusion structure of the 3D printer, greatly reduces the volume of the entire machine. The first exhaust pipe 210 is installed in the heat dissipation member 200 and is used to discharge the consumables 101 of the 3D printer. The exhaust pipe is a Teflon pipe, and the consumables 101 are exhausted from the Teflon pipe. Specifically, as shown in FIG. 3 and FIG. 5, a second exhaust pipe 211 is further provided above the first exhaust pipe 210. A feed pipe 212 is provided above the extrusion gear. The consumables 101 enter the extrusion structure of the 3D printer from the feed pipe 212, are extruded through the extrusion gear, and then pass through the second exhaust pipe 211 and the first exhaust pipe 210 in sequence. The throat pipe 220 is attached to the outer periphery of the first exhaust pipe 210. One end of the throat pipe 220 contacts the heat dissipation member 200, and the other end of the throat pipe 220 contacts the heating block 250 to transfer heat generated in the heating block 250 to the heat dissipation member 200, thereby realizing heat dissipation. The first heat dissipation fan 230 and the first air guide member 240 are fixed to the outside of the housing 110. Specifically, the first heat dissipation fan 230 and the first air guide member 240 may be attached to the left or right side of the extrusion structure of the 3D printer. The first air guide member 240 can guide the air blown out from the first heat dissipation fan 230 to the heat dissipation member 200. As shown in FIG. 3, in this embodiment, the first heat dissipation fan 230 and the first air guide member 240 are attached to the left side, and the first air guide member 240 has a first air guide port 241. The first air guide port 241 is located at the left end of the heat dissipation member 200, and the first heat dissipation fan 230 blows the heat dissipation airflow from the first air guide port 241 to the heat dissipation member 200. As shown in FIG. 3, the heat dissipation member 200 is a substantially groove-shaped body.The groove-shaped body is provided with several heat dissipation fins, and the first air guide port 241 is located at the left end of the groove-shaped body and blows the heat dissipation airflow from left to right through the heat dissipation member 200. The heat dissipation member 200 is preferably made of a metal material with good heat dissipation performance, such as aluminum.

[0027] As shown in FIG. 3 and FIG. 5, the extrusion structure of the 3D printer further includes a heating block 250, a nozzle 260, and a heating pipe 270. The heating block 250 is installed under the heat dissipation member 200. The nozzle 260 is installed at the bottom end of the heating block 250. Specifically, the nozzle 260 can be screwed to the bottom end of the heating block 250. In this way, the installation can be completed simply by tightening the nozzle 260, which is simple and quick. The consumable material 101 is discharged from the nozzle 260 after passing through the heat dissipation member 200 and the heating block 250 in sequence. The heating pipe 270 is provided on the heating block 250 to heat the consumable material 101 in the heating block 250. The heating pipe 270 is connected to an external power source to realize heating. The heating pipe 270 generates heat after being energized, transfers the heat to the heating block 250, and further increases the temperature of the consumable material 101 in the heating block 250.

[0028] In order to improve safety performance, as shown in Fig. 3 and Fig. 5, the outer surface of the heating block 250 may be covered with a heat insulating member 251 to prevent a person from accidentally touching the heating block 250 and getting burned. The heat insulating member 251 uses a heat insulating material. For example, a silica gel sleeve, a plastic sleeve, a rubber sleeve, or the like may be used.

[0029] Furthermore, a thermistor 252 for detecting the heating temperature is provided within the heating block 250. This allows for accurate control of the heating temperature.

[0030] As shown in FIG. 3, FIG. 5 and FIG. 6, the extrusion structure of the 3D printer further includes a second heat dissipation fan 280 and a second air guide member 290. The second heat dissipation fan 280 and the second air guide member 290 are provided in the housing 110. In this embodiment, the second heat dissipation fan 280 and the second air guide member 290 are provided on the rear side of the housing 110 and located below the motor 120. In this manner, the space below the motor 120 can be fully utilized to reduce the volume of the entire machine. The second air guide member 290 can guide the wind of the second heat dissipation fan 280 to the model below the extrusion structure of the 3D printer. Specifically, as shown in FIG. 3, FIG. 5 and FIG. 6, a second air guide port 291 facing downward is provided on both the left and right sides of the second air guide member 290 in order to blow the cooling airflow to the printing model below and cool the printing model. The present invention adopts a special heat dissipation flow path design, which reduces the volume while ensuring the overall heat dissipation effect and improving the printing effect.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connection", "connection", and "fixed" should be understood in a broad sense, for example, may be fixed connection, may be detachable connection, may be integral, may be mechanical connection, may be electrical connection, may be directly connected, may be indirectly connected via an intermediate medium, may be internal communication between two elements, or may be an interaction relationship between two elements. Those skilled in the art can understand the meaning of the above terms in the present invention according to the specific situation.

[0032] In the present invention, unless otherwise clearly specified and limited, the term "above" or "below" a first element on a second element may include direct contact between the first and second elements, or may include contact between the first and second elements via another element between them, rather than direct contact. Furthermore, the term "above" a first element on a second element includes the first element being directly above and diagonally above the second element, or only means that the horizontal height of the first element is higher than that of the second element. Furthermore, the term "below" a first element on a second element includes the first element being directly below and diagonally below the second element, or only means that the horizontal height of the first element is lower than that of the second element.

[0033] In the description of the present embodiment, the terms "upper", "lower", "left", "right", "front", "rear" and other orientations or positional relationships are those shown based on the drawings, and are merely for ease of description and simplification of operation, and do not indicate or imply that the indicated devices or elements have a specific orientation or must be configured and operated in a specific orientation, and cannot be understood as limitations on the present invention. In addition, the terms "first" and "second" are used only to distinguish the description and do not have any special meaning.

[0034] Obviously, the above-mentioned embodiments of the present invention are not intended to limit the present invention, but are merely intended to clearly explain the technical aspects of the present invention. Those skilled in the art may make various obvious modifications, rearrangements, and substitutions without departing from the scope of protection of the present invention. It is not possible or necessary to exhaust all the embodiments here. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of the claims of the present invention. [Explanation of symbols]

[0035] 101 Consumables 110 Housing 111 Front case 112 Rear case 113 Positioning structure 120 Motor 130 Main drive gear 131 First rotating pin 132 Rotation axis 140 Adjustment bracket 141 Mounting screw 142 Position regulation structure 150 Driven push gear 151 Second rotating pin 152 No. 1 plastic flange bearing 153 No. 2 plastic flange bearing 160 Elastic member 170 Motor Gear 180 Gear Rotation Axis 181 Bearings 190 Reduction Gear 200 Heating member 210 1st discharge pipe 211 2nd discharge pipe 212 Feed pipe 220 Throat Tube 230 First heat dissipation fan 240 First air guide member 241 First air outlet 250 Heating Block 251 Insulation materials 252 Thermistor 260 Nozzle 270 Heating Pipe 280 Second cooling fan 290 Second air guide member 291 Second air outlet

Claims

1. A housing (110); A motor (120) provided in the housing (110); a driven push gear (130) disposed within the housing (110) and connected to the motor (120); an adjustment bracket (140) pivotally coupled within the housing (110) via a first pivot pin; a driven push gear (150) provided at one end of the adjustment bracket (140) and rotatably connected to the adjustment bracket (140) via a second pivot pin; an elastic member (160) connected to the other end of the adjustment bracket (140) to allow the end of the adjustment bracket (140) on which the driven extrusion gear (150) is provided to approach the driving extrusion gear (130) and to cause the driven extrusion gear (150) to cooperate with the driving extrusion gear (130) to extrude material; Here, one end of the adjustment bracket (140) on which the driven push gear (150) is provided protrudes to the outside of the housing (110) and a dial lever located outside the housing is formed, and the adjustment bracket is rotatable around the rotation axis of the first rotation pin, During the process of the adjustment bracket being rotated in the clockwise direction, the elastic member is compressed, the driven push gear and the driving push gear are separated, and consumables can be inserted between the driven push gear and the driving push gear; When the adjustment bracket is released from the external force, the adjustment bracket is reset by the elastic force of the elastic member, and the driven push gear and the driving push gear cooperate to clamp the consumable material and push the consumable material outward as the hub rotates.

2. A motor gear (170) connected to the motor (120); a gear shaft (180) rotatably connected within the housing (110); A reduction gear (190) is provided on the gear rotation shaft (180) and meshes with the motor gear (170), 2. The extrusion structure of a 3D printer according to claim 1, wherein the outer diameter of the reduction gear (190) is larger than the outer diameter of the motor gear (170), and the driving extrusion gear (130) is provided on the gear rotation shaft (180) and rotates coaxially with the reduction gear (190).

3. a heat dissipation member (200) provided below the driving push gear (130) and the driven push gear (150); A first discharge pipe (210) provided in the heat dissipation member (200) for discharging consumables (101) of the 3D printer; a throat pipe (220) attached to the outside of the first exhaust pipe (210) and having one end in contact with the heat dissipation member (200); The housing further includes a first heat dissipation fan and a first air guide member, 2. The extrusion structure of a 3D printer according to claim 1, wherein the first air guide member (240) is capable of guiding air blown out by the first heat dissipation fan (230) to the heat dissipation member (200).

4. The apparatus further includes a heating block (250) provided below the heat dissipation member (200), a nozzle (260) provided at a bottom end of the heating block (250), and a heating pipe (270) provided in the heating block (250) for heating a consumable material (101) in the heating block (250), The other end of the throat pipe (220) contacts the heating block (250); 4. The extrusion structure of a 3D printer according to claim 3, wherein the consumable material (101) is ejected from the nozzle (260) after passing through the heat dissipation member (200) and the heating block (250) in sequence.

5. The extrusion structure of a 3D printer according to claim 2, characterized in that a portion of the outer periphery of the reduction gear (190) penetrates the housing (110) and is exposed to the outside.

6. The housing further includes a second heat dissipation fan and a second air guide member. The extrusion structure of a 3D printer according to claim 1, wherein the second air guide member (290) guides air from the second heat dissipation fan (280) to a model below the extrusion structure of the 3D printer.

7. The extrusion structure of a 3D printer according to claim 1, further comprising a mounting screw (141), a positioning structure (113) for mounting the mounting screw (141) is provided within the housing (110), the mounting screw (141) is provided in the positioning structure (113), and the elastic member (160) is attached so as to surround the mounting screw (141).

8. The extrusion structure of a 3D printer as described in claim 1, characterized in that the other end of the adjustment bracket (140) has a first side and a second side along its rotation direction, the first side is connected to the elastic member (160), and a position regulating structure (142) is provided on the second side within the housing (110) to regulate the position of the adjustment bracket (140).

9. The extrusion structure of a 3D printer according to claim 4, characterized in that a thermistor (252) is provided within the heating block (250).

10. 5. The extrusion structure of a 3D printer according to claim 4, wherein a surface of the heating block (250) is covered with a heat insulating material (251).

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