Extrusion molding mechanism

Abstract

The extrusion molding mechanism comprises an extrusion device and a three-axis moving platform, the extrusion device comprises a material container, a stock bin and a heating device, a discharge port is formed in the bottom of the material container, an extrusion paddle is rotatably installed in the material container and is in transmission connection with an extrusion driving motor, the stock bin is communicated with the material container, and the heating device is connected with the three-axis moving platform. The heating device is arranged in the stock bin or the material container, and the three-axis moving platform can drive the extrusion device to reciprocate in the front-back direction, the left-right direction and the up-down direction. When an enterprise produces and manufactures plastic products, the three-axis moving platform drives the extrusion device to move in the three-dimensional space, the extrusion device extrudes heated and melted plastic from the discharging opening in the bottom of the material container, the needed plastic products are obtained through molding, an injection mold does not need to be customized like injection molding, the production cost is greatly reduced, and the production efficiency is improved. And plastic products with larger extrusion molding areas can be extruded, so that the production requirements of enterprises are well met.

Description

Technical Field

[0001] This utility model relates to the field of plastic extrusion molding, and in particular to an extrusion molding mechanism. Background Technology

[0002] With social development and continuous advancements in science and technology, the number of items made from plastics is increasing. Among these, companies often use injection molding to manufacture plastic items. While injection molding is highly efficient, it requires companies to customize injection molds, which are very expensive, significantly increasing production costs.

[0003] In addition, for large sheet plastic items, if injection molding is used for production, companies need to customize large injection molds. Not only are the molds expensive, but companies also need to purchase large injection molding machines, which puts a huge economic burden on their production and operation. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention provides an extrusion molding mechanism that can be used to manufacture large-area plastic products while maintaining low production costs, thus helping to enhance the social competitiveness of enterprises.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: an extrusion molding mechanism, including an extrusion device and a three-axis moving platform. The extrusion device includes a material container, a hopper, and a heating device. The bottom of the material container has a discharge port. An extrusion paddle is rotatably installed inside the material container. The extrusion paddle is driven by an extrusion drive motor located outside the material container. The hopper is connected to the inside of the material container through a pipe. The heating device is disposed on the outer peripheral wall of the hopper or the outer peripheral wall of the material container. The heating device can generate heat when energized. The three-axis moving platform is driven by the extrusion device and can drive the extrusion device to reciprocate along the front-back direction, the left-right direction, and the up-down direction.

[0006] The beneficial effects of an extrusion molding mechanism according to certain embodiments of this utility model are as follows:

[0007] This embodiment of an extrusion molding mechanism employs a structure that combines a three-axis moving platform with an extrusion device. The three-axis moving platform is connected to the extrusion device via a transmission mechanism, enabling the extrusion device to reciprocate along the front-back, left-right, and up-down directions. This allows the extrusion device to move freely within a three-dimensional space. Therefore, when manufacturing plastic products, the three-axis moving platform drives the extrusion device to move within the three-dimensional space, and the extrusion device extrudes heated and molten plastic from the discharge port at the bottom of the material container, thereby forming the desired plastic product. Unlike injection molding, it does not require customized injection molds, which significantly reduces production costs and allows for the extrusion molding of plastic products with larger areas, effectively meeting the production needs of enterprises and enhancing their social competitiveness.

[0008] In some embodiments of this utility model, the three-axis moving platform includes a fixed base, the fixed base being provided with a first slide rail arranged along the front-back direction, a first sliding seat being movably mounted on the first slide rail, the first sliding seat being drivenly connected to a front-back drive mechanism fixedly mounted on the fixed base, the first sliding seat being provided with a second slide rail arranged along the left-right direction, the second slide rail being movably mounted with a second sliding seat, the second sliding seat being drivenly connected to a left-right drive mechanism fixedly mounted on the first sliding seat, the second sliding seat being provided with a third slide rail arranged along the up-down direction, the third slide rail being movably mounted with a lifting slide seat, the lifting slide seat being drivenly connected to a lifting drive mechanism fixedly mounted on the second sliding seat; the material container and the extrusion drive motor are fixedly mounted on the lifting slide seat.

[0009] In some embodiments of this utility model, the material container is cylindrical, the extrusion paddle is rotatably mounted at the center of the material container in the vertical direction, the extrusion drive motor is located above the material container, and the output shaft of the extrusion drive motor is connected to the extrusion paddle in a transmission connection.

[0010] In some embodiments of this utility model, the discharge port is a circular through hole opened at the center of the bottom wall of the material container, and the discharge port is coaxially arranged with the extrusion paddle.

[0011] In some embodiments of this utility model, a rotating guide is provided at the lower part of the material container. The rotating guide is coaxially disposed at the discharge port. An annular gap is formed between the outer peripheral wall of the rotating guide and the inner peripheral wall of the discharge port. The lower part of the rotating guide has a truncated cone that gradually narrows from top to bottom.

[0012] In some embodiments of this utility model, a first pipe is coaxially arranged on the upper part of the material container, the first pipe is connected to the interior of the material container, the upper part of the extrusion paddle extends into the interior of the first pipe, the output shaft of the extrusion drive motor extends downward into the interior of the first pipe, and the output shaft of the extrusion drive motor is drivenly connected to the upper part of the extrusion paddle; the hopper is located on one side of the extrusion drive motor, and a second pipe connected to the first pipe is arranged at the bottom of the hopper.

[0013] In some embodiments of this utility model, the upper part of the material container has an opening communicating with the interior of the material container, and the upper part of the material container is detachably fitted with an end cap that can seal the opening, and the lower part of the first pipe is connected to the end cap.

[0014] In some embodiments of this utility model, the lifting slide is provided with a motor mounting base located above the material container, and the extrusion drive motor is mounted on the motor mounting base.

[0015] In some embodiments of this utility model, the front-rear drive mechanism includes a first servo motor, a first lead screw, and a first nut. The first servo motor is fixedly mounted on the fixed base. The first lead screw is arranged along the front-rear direction, and one end of the first lead screw is drivenly connected to the output end of the first servo motor. The first nut is threadedly connected to the first lead screw and is fixedly connected to the first sliding seat. The left-right drive mechanism includes a second servo motor, a second lead screw, and a second nut. The second servo motor is fixedly mounted on the first sliding seat. The second lead screw is arranged along the left-right direction, and one end of the second lead screw is drivenly connected to the output end of the second servo motor. The second nut is threadedly connected to the second lead screw and is connected to the second sliding seat. The lifting drive mechanism includes a third servo motor, a third lead screw, and a third nut. The third servo motor is fixedly mounted on the second sliding seat. The third lead screw is arranged along the up-down direction, and one end of the third lead screw is drivenly connected to the output end of the third servo motor. The third nut is threadedly connected to the third lead screw and is connected to the lifting slide.

[0016] In some embodiments of this utility model, the output end of the first servo motor is connected to the first lead screw via a first synchronous belt drive mechanism; the output shaft of the second servo motor is connected to the second lead screw via a second synchronous belt drive mechanism; and the output end of the third servo motor is connected to the third lead screw via a third synchronous belt drive mechanism. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of an extrusion molding mechanism according to certain embodiments of the present invention;

[0019] Figure 2 for Figure 1 The diagram shows a structural schematic of an extrusion molding mechanism from another angle;

[0020] Figure 3 for Figure 1 The diagram shows an assembly structure of the extrusion device and the lifting slide in an extrusion molding mechanism.

[0021] Figure 4 for Figure 1 The diagram shows an assembly structure of the extrusion device and the lifting slide at another angle in an extrusion molding mechanism.

[0022] Figure 5 for Figure 1 The figure shows a cross-sectional view of the internal structure of the extrusion device in an extrusion molding mechanism. Detailed Implementation

[0023] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0024] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] In the description of this utility model, "several" means one or more, "multiple" means three or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If the terms "first," "second," etc., are used only to distinguish technical features, and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0026] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0027] Figures 1 to 5 This is a schematic diagram of some embodiments of an extrusion molding mechanism according to the present invention.

[0028] Reference Figures 1 to 5 and mainly refer to Figure 1 , Figure 3 , Figure 4 and Figure 5 According to certain embodiments of the present invention, an extrusion molding mechanism (hereinafter referred to as "extrusion molding mechanism" for ease of explanation) includes an extrusion device 100 and a three-axis moving platform 200. The extrusion device 100 includes a material container 110, a hopper 120, and a heating device. The material container 110 is a shell with an internal cavity. In this embodiment, the material container 110 is a metal container made of metal material. A discharge port 111 is provided at the bottom of the material container 110. An extrusion paddle 112 is rotatably mounted inside the material container 110. Specifically, the extrusion paddle 112 is a propeller, or it includes a central rod with multiple blades spaced apart on its outer peripheral wall. The extrusion paddle 112 is driven by an extrusion drive motor 113 located outside the material container 110, which drives the extrusion paddle 112 to rotate inside the material container 110. The hopper 120 is used to load the material to be heated and melted. The hopper 120 is connected to the interior of the material container 110 via a pipe. A heating device is installed on the outer peripheral wall of the hopper 120 or the material container 110. The heating device generates heat when energized. In this embodiment, the heating device is a resistance heating wire installed on the outer peripheral wall of the hopper 120 or the material container 110. When energized, the heating device can heat and melt the plastic inside the hopper 120, or the heating device can heat and melt the plastic inside the material container 110. The three-axis moving platform 200 is connected to the extrusion device 100 via a transmission connection. The three-axis moving platform 200 can drive the extrusion device 100 to reciprocate along the front-back direction, the left-right direction, and the up-down direction.

[0029] By adopting the above structure, the three-axis moving platform 200 is connected to the extrusion device 100 through a transmission connection. The three-axis moving platform 200 can drive the extrusion device 100 to move back and forth, left and right, and up and down in the direction of the front and back, left and right, and up and down. This allows the extrusion device 100 to move arbitrarily in three-dimensional space. Therefore, when enterprises manufacture plastic products, the three-axis moving platform 200 drives the extrusion device 100 to move in three-dimensional space. The extrusion device 100 extrudes the heated and molten plastic from the discharge port 111 at the bottom of the material container 110, thereby forming the required plastic product. Unlike injection molding, there is no need to customize injection molds, which greatly reduces production costs and allows for the extrusion of plastic products with a larger extrusion area, thus well meeting the production needs of enterprises and improving their social competitiveness.

[0030] Reference Figure 1 , Figure 2 To simplify the structure of the three-axis moving platform 200, in some embodiments of this utility model, the three-axis moving platform 200 includes two spaced fixed bases 201. Each fixed base 201 is provided with a first slide rail 210 arranged along the front-back direction. The two first slide rails 210 are parallel to each other. A first sliding seat 211 is movably mounted on the two first slide rails 210. The first sliding seat 211 is driven by a front-back drive mechanism fixedly mounted on the fixed base 201. The first sliding seat 211 is provided with a second slide rail 220 arranged along the left-right direction. The second slide rail 220 is movably mounted with a second sliding seat 221. The second sliding seat 221 is driven by a left-right drive mechanism fixedly mounted on the first sliding seat 211. The second sliding seat 221 is provided with a third slide rail 230 arranged along the up-down direction. A lifting slide seat 231 is movably mounted on the third slide rail 230. The lifting slide seat 231 is driven by a lifting drive mechanism fixedly mounted on the second sliding seat 221. The material container 110 and the extrusion drive motor 113 are fixedly mounted on the lifting slide seat 231. By adopting the above structure, the three-axis moving platform 200 becomes more compact, which helps to reduce the production cost of the three-axis moving platform 200, thereby making the three-axis moving platform 200 drive the extrusion device 100 to move more smoothly in three-dimensional space.

[0031] In some embodiments of this utility model, the front-rear drive mechanism includes a first servo motor, a first lead screw, and a first nut. The first servo motor is fixedly mounted on the fixed base 201. The first lead screw is arranged along the front-rear direction, and one end of the first lead screw is drivenly connected to the output end of the first servo motor. The first nut is threadedly connected to the first lead screw and is fixedly connected to the first sliding seat 211. The left-right drive mechanism includes a second servo motor 222, a second lead screw 223, and a second nut 224. The second servo motor 222 is fixedly mounted on the first sliding seat 211. The second lead screw 223 is arranged along the left-right direction, and one end of the second lead screw 223 is drivenly connected to the output end of the second servo motor 222. The second nut 224 is threadedly connected to the second lead screw 223 and is connected to the second sliding seat 221. The lifting drive mechanism includes a third servo motor 232, a third lead screw 233, and a third nut 234. The third servo motor 232 is fixedly mounted on the second sliding seat 221. The third lead screw 233 is arranged along the vertical direction, and one end of the third lead screw 233 is connected to the output end of the third servo motor 232. The third nut 234 is threadedly connected to the third lead screw 233 and is connected to the lifting sliding seat 231. By adopting the above structure, the three-axis moving platform 200 can more accurately drive the extrusion device 100 to reciprocate along the front-back, left-right, and vertical directions.

[0032] Furthermore, the output end of the first servo motor is connected to the first lead screw via a first synchronous belt drive mechanism; the output shaft of the second servo motor 222 is connected to the second lead screw 223 via a second synchronous belt drive mechanism; and the output end of the third servo motor 232 is connected to the third lead screw 233 via a third synchronous belt drive mechanism. By adopting the above structure, the first servo motor, the second servo motor 222, and the third servo motor 232 can drive the corresponding first lead screw, second lead screw 223, and third lead screw 233 to rotate more precisely. It should be noted that since the first synchronous belt drive mechanism, the second synchronous belt drive mechanism, and the third synchronous belt drive mechanism are all prior art in the art, they will not be described in detail here.

[0033] It is understandable that, in addition to the structures described above, the front-to-back drive mechanism, left-to-right drive mechanism, and lifting drive mechanism can also employ other structures. For example, all three mechanisms could use cylinders. In this case, the front-to-back drive mechanism would be a first cylinder fixedly mounted on the fixed base 201, connected to the first sliding seat 211, which would drive the first sliding seat 211 to reciprocate along the first slide rail 210. The left-to-right drive mechanism would be a second cylinder fixedly mounted on the first sliding seat 211, connected to the second sliding seat 221, which would drive the second sliding seat 221 to reciprocate along the second slide rail 220. The lifting drive mechanism would be a third cylinder fixedly mounted on the second sliding seat 221, connected to the lifting slide seat 231, which would drive the lifting slide seat 231 to reciprocate along the third slide rail 230.

[0034] Reference Figure 1 , Figure 3 , Figure 4 and Figure 5 In some embodiments of this utility model, the material container 110 is cylindrical, the extrusion paddle 112 is rotatably mounted at the center of the material container 110 in the vertical direction, the extrusion drive motor 113 is located above the material container 110, and the output shaft of the extrusion drive motor 113 is connected to the extrusion paddle 112 in a transmission connection. By adopting the above structure, the layout of the drive motor 113 and the material container 110 can be made more reasonable, which helps to reduce the volume of the extrusion device 100, and at the same time facilitates the extrusion paddle 112 to extrude the material inside the material container 110 from the discharge port 111, so that the extrusion effect of the extrusion device 100 is better.

[0035] In order to better mount the extrusion drive motor 113 on the lifting slide 231, in some embodiments of the present invention, the lifting slide 231 is provided with a motor mounting base 1130 located above the material container 110, and the extrusion drive motor 113 is mounted on the motor mounting base 1130.

[0036] In some embodiments of this utility model, the discharge port 111 is a circular through hole opened at the center of the bottom wall of the material container 110, and the discharge port 111 is coaxially arranged with the extrusion paddle 112. By adopting the above structure, the extrusion paddle 112 can better extrude the material from the discharge port 111.

[0037] Reference Figure 3 , Figure 4 and Figure 5In some embodiments of this utility model, a rotating guide 114 is provided at the lower part of the material container 110. In this embodiment, the rotating guide 114 is a cylinder, coaxially disposed at the discharge port 111, with its upper end located below the extrusion paddle 112. The upper part of the rotating guide 114 is fixedly connected to the material container 110, and an annular gap is formed between the outer peripheral wall of the rotating guide 114 and the inner peripheral wall of the discharge port 111. The lower part of the rotating guide 114 has a truncated cone 115 that gradually narrows from top to bottom. By adopting the above structure, when the extrusion paddle 112 extrudes the material from the discharge port 111, the material can flow from top to bottom along the truncated cone 115 of the rotating guide 114, thereby making the extruded material more uniform and less prone to splashing.

[0038] To facilitate better material delivery from the hopper 120 into the material container 110, in some embodiments of this invention, a first pipe 131 is coaxially arranged at the upper part of the material container 110, communicating with the interior of the material container 110. The upper part of the extrusion paddle 112 extends into the first pipe 131, and the output shaft of the extrusion drive motor 113 extends downward into the first pipe 131, with the output shaft of the extrusion drive motor 113 being drively connected to the upper part of the extrusion paddle 112. The hopper 120 is located on one side of the extrusion drive motor 113, and a second pipe 132 communicating with the first pipe 131 is provided at the bottom of the hopper 120. By adopting the above structure, the material placed in the hopper 120 can first be delivered into the first pipe 131 through the second pipe 132, and then the material is delivered into the material container 110 from the first pipe 131.

[0039] In some embodiments of this utility model, the silo 120 is a metal shell made of metal material, and the heating device is set on the outer peripheral wall of the silo 120. When the heating device is powered on, the heating device can heat and melt the material inside the silo 120 into a fluid. Then the material first flows into the first pipe 131 through the second pipe 132, and then the material flows into the material container 110 from the first pipe 131.

[0040] To facilitate cleaning of the material container 110, in some embodiments of this invention, the upper part of the material container 110 has an opening communicating with the interior of the material container 110. An end cap 140 capable of sealing the opening is detachably installed on the upper part of the material container 110, and the lower part of the first pipe 131 is connected to the end cap 140. Specifically, a connecting hole communicating with the first pipe 131 is provided in the middle of the end cap 140, allowing material inside the first pipe 131 to pass through the connecting hole in the middle of the end cap 140 and flow into the material container 110. With this structure, when needed, the user can remove the end cap 140 from the upper part of the material container 110, facilitating the removal of material from the container and allowing the user to replace materials of different colors or materials for extrusion molding.

[0041] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. An extrusion molding mechanism, characterized in that, include: An extrusion device (100) includes a material container (110), a hopper (120), and a heating device. The material container (110) has a discharge port (111) at its bottom. An extrusion paddle (112) is rotatably installed inside the material container (110). The extrusion paddle (112) is driven by an extrusion drive motor (113) located outside the material container (110). The hopper (120) is connected to the inside of the material container (110) through a pipe. The heating device is located on the outer peripheral wall of the hopper (120) or the outer peripheral wall of the material container (110). The heating device can generate heat when energized. A three-axis moving platform (200) is connected to the extrusion device (100) via a transmission connection. The three-axis moving platform (200) can drive the extrusion device (100) to reciprocate along the front-back direction, the left-right direction, and the up-down direction.

2. The extrusion molding mechanism according to claim 1, characterized in that: The three-axis moving platform (200) includes a fixed base (201), the fixed base (201) is provided with a first slide rail (210) arranged along the front-back direction, the first slide rail (210) is movably mounted with a first sliding seat (211), the first sliding seat (211) is drivenly connected to a front-back drive mechanism fixedly mounted on the fixed base (201), the first sliding seat (211) is provided with a second slide rail (220) arranged along the left-right direction, the second slide rail (220) is movably mounted with a second sliding seat (221), the second sliding seat (221) is drivenly connected to a left-right drive mechanism fixedly mounted on the first sliding seat (211), the second sliding seat (221) is provided with a third slide rail (230) arranged along the up-down direction, the third slide rail (230) is movably mounted with a lifting slide seat (231), the lifting slide seat (231) is drivenly connected to a lifting drive mechanism fixedly mounted on the second sliding seat (221); The material container (110) and the extrusion drive motor (113) are fixedly mounted on the lifting slide (231).

3. The extrusion molding mechanism according to claim 2, characterized in that: The material container (110) is cylindrical, and the extrusion paddle (112) is rotatably mounted at the center of the material container (110) in the vertical direction. The extrusion drive motor (113) is located above the material container (110), and the output shaft of the extrusion drive motor (113) is connected to the extrusion paddle (112) in a transmission connection.

4. The extrusion molding mechanism according to claim 3, characterized in that: The discharge port (111) is a circular through hole opened at the center of the bottom wall of the material container (110), and the discharge port (111) is coaxially arranged with the extrusion paddle (112).

5. An extrusion molding mechanism according to claim 4, characterized in that: The material container (110) is provided with a rotating guide (114) at the lower part. The rotating guide (114) is coaxially arranged at the discharge port (111). An annular gap is formed between the outer peripheral wall of the rotating guide (114) and the inner peripheral wall of the discharge port (111). The lower part of the rotating guide (114) has a truncated cone (115) that gradually narrows from top to bottom.

6. The extrusion molding mechanism according to claim 3, characterized in that: The material container (110) is coaxially provided with a first pipe (131) at its upper part. The first pipe (131) is connected to the inside of the material container (110). The upper part of the extrusion paddle (112) extends into the inside of the first pipe (131). The output shaft of the extrusion drive motor (113) extends downward into the inside of the first pipe (131). The output shaft of the extrusion drive motor (113) is connected to the upper part of the extrusion paddle (112) in a transmission connection. The hopper (120) is located on one side of the extrusion drive motor (113), and a second pipe (132) connected to the first pipe (131) is provided at the bottom of the hopper (120).

7. An extrusion molding mechanism according to claim 6, characterized in that: The material container (110) has an opening at its upper part that communicates with the interior of the material container (110). The material container (110) is detachably fitted with an end cap (140) that can seal the opening. The lower part of the first pipe (131) is connected to the end cap (140).

8. An extrusion molding mechanism according to claim 3, characterized in that: The lifting slide (231) is provided with a motor mounting base (1130) located above the material container (110), and the extrusion drive motor (113) is mounted on the motor mounting base (1130).

9. An extrusion molding mechanism according to claim 2, characterized in that: The front and rear drive mechanism includes a first servo motor, a first lead screw and a first nut. The first servo motor is fixedly installed on the fixed base (201). The first lead screw is arranged along the front and rear direction, and one end of the first lead screw is connected to the output end of the first servo motor. The first nut is threadedly connected to the first lead screw, and the first nut is fixedly connected to the first sliding seat (211). The left and right drive mechanism includes a second servo motor (222), a second lead screw (223), and a second nut (224). The second servo motor (222) is fixedly installed on the first sliding seat (211). The second lead screw (223) is arranged along the left and right direction, and one end of the second lead screw (223) is connected to the output end of the second servo motor (222). The second nut (224) is threaded to the second lead screw (223) and is connected to the second sliding seat (221). The lifting drive mechanism includes a third servo motor (232), a third lead screw (233), and a third nut (234). The third servo motor (232) is fixedly installed on the second sliding seat (221). The third lead screw (233) is arranged along the vertical direction, and one end of the third lead screw (233) is connected to the output end of the third servo motor (232). The third nut (234) is threaded to the third lead screw (233) and is connected to the lifting sliding seat (231).

10. An extrusion molding mechanism according to claim 9, characterized in that: The output end of the first servo motor is connected to the first lead screw drive via a first synchronous belt drive mechanism; The output shaft of the second servo motor (222) is connected to the second lead screw (223) via a second synchronous belt transmission mechanism; The output end of the third servo motor (232) is connected to the third lead screw (233) via a third synchronous belt transmission mechanism.

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