Traction mechanism of polymer polylactic acid solid extrusion molding machine

Abstract

The utility model discloses a traction mechanism of a polymer polylactic acid solid extrusion molding machine, which comprises an electric linear module and a traction chuck, the traction chuck is fixedly mounted on a sliding table of the electric linear module through a mounting piece, the traction chuck comprises a clamping sleeve, two movable notches are formed in the top of the clamping sleeve, and the movable notches are matched with the clamping sleeve. Two movable notches are formed in the clamping sleeve, a push-pull rod is movably arranged between the two movable notches, clamping jaws are arranged at the two ends of the push-pull rod in a sliding mode, guide inclined holes corresponding to the clamping jaws in a one-to-one mode are formed in the clamping sleeve, and the lower ends of the clamping jaws penetrate through the guide inclined holes in a sliding mode. The distance between the two clamping jaws is increased by pulling the push-pull rod in the direction away from the guide inclined hole, a formed polylactic acid product can be stably pulled through the electric linear module and the traction chuck, and the product percent of pass is increased.

Description

Technical Field

[0001] This utility model relates to the field of solid extrusion molding technology of polylactic acid (PLA), and particularly to the traction mechanism of a solid extrusion molding machine for PLA. Background Technology

[0002] Polylactic acid (PLA), as a bio-based polymer material, is biodegradable and has good biocompatibility, and is widely used in packaging, textiles, medical, 3D printing and industrial products.

[0003] Traditional injection molding processes produce products with inherent defects such as low density and insufficient fracture strength, making it difficult to meet the stringent mechanical property requirements of fields like medical devices. Solid extrusion molding technology, through a secondary densification treatment of the injection preform, can significantly improve the material's density and fracture resistance. However, when the ejection length of the molded product exceeds a critical value before it is fully cooled, plastic bending deformation is prone to occur, significantly impacting the product's molding quality. Utility Model Content

[0004] The purpose of this invention is to provide a traction mechanism for a polylactic acid solid extrusion molding machine to solve the technical problem that extruded products are prone to bending and deformation after reaching a critical length.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] The traction mechanism of the polylactic acid solid extrusion molding machine includes an electric linear module and a traction chuck for traction of polylactic acid products. The traction chuck is fixedly mounted on the slide of the electric linear module by a mounting component.

[0007] The traction chuck includes a sleeve with two symmetrical movable notches on its top. A push-pull rod is movably arranged between the two movable notches, and jaws are slidably arranged at both ends of the push-pull rod. The sleeve has guide oblique holes that correspond one-to-one with the jaws. The lower end of the jaw slides through the guide oblique hole. By pushing the push-pull rod towards the guide oblique hole, the distance between the two jaws can be reduced, and by pulling the push-pull rod away from the guide oblique hole, the distance between the two jaws can be increased.

[0008] As a further embodiment of this utility model, a clamping plate is fixedly provided at the outer end of the gripper away from the push-pull rod.

[0009] As a further embodiment of this utility model, anti-slip texture is provided on the clamping plate.

[0010] As a preferred embodiment of this utility model, the traction clamp also includes a cylinder, and a connecting rod is fixedly provided on the push-pull rod, with one end of the connecting rod away from the push-pull rod being fixedly connected to the end of the piston rod of the cylinder.

[0011] As a further preferred embodiment of this utility model, the mounting component includes a base, an L-shaped fixing seat, and a mounting seat. The base is fixedly mounted on the slide of the electric linear module. The bottom of the L-shaped fixing seat has a first waist hole for bolt assembly with the base. The mounting seat has a second waist hole for bolt assembly with the upper end of the L-shaped fixing seat. The cylinder and the jacket are both fixedly mounted on the outer end of the mounting seat away from the L-shaped fixing seat.

[0012] Compared with existing technologies, the traction mechanism of the polylactic acid solid extrusion molding machine provided by this utility model has the following beneficial effects:

[0013] This invention uses an electric linear module and traction clamp to stably pull the molded polylactic acid product, preventing it from bending and improving the product qualification rate. Moreover, the mechanism has a simple structure, making it easy to operate and maintain. The installation position of the traction clamp can be adjusted as needed through the installation parts to adapt to different types of polylactic acid solid extrusion molding. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only examples of embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0016] Figure 2 This is a partial structural schematic diagram of an embodiment of the present utility model;

[0017] Figure 3 This is a schematic diagram of the jacket structure of this utility model;

[0018] Figure 4 This is a cross-sectional structural diagram of the jacket of this utility model;

[0019] Figure 5 This is a partial cross-sectional structural diagram of the traction clamp of this utility model;

[0020] Figure 6 This is a schematic diagram of the structure of this utility model installed on a polylactic acid solid extrusion molding machine.

[0021] Explanation of icon numbers:

[0022] 1. Electric linear module; 2. Mounting components; 201. Base; 202. L-shaped fixing seat; 2021. First waist hole; 203. Mounting seat; 2031. Second waist hole; 2032. Reinforcing rib; 3. Traction clamp; 301. Cylinder; 302. Jacket; 3021. Movable notch; 3022. Guide oblique hole; 303. Gripper; 304. Clamping plate; 3041. Anti-slip texture; 305. Push-pull rod; 306. Connecting rod. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0024] In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of the present invention 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 the embodiments of the present invention.

[0025] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present invention should be understood according to the specific circumstances.

[0026] See Figure 1 As shown, the traction mechanism of the polylactic acid solid extrusion molding machine of this utility model includes an electric linear module 1 and a traction clamp 3 for traction of polylactic acid products. The traction clamp 3 is fixedly mounted on the slide of the electric linear module 1 by a mounting component 2. The electric linear module 1 is a power drive component that drives the slide to move linearly. When the electric linear module 1 drives the slide to move, the traction clamp 3 also moves linearly, thereby performing a traction operation on the polylactic acid products.

[0027] See Figure 2-5As shown in the embodiment of this utility model, the traction clamp 3 includes a sleeve 302. The top of the sleeve 302 has two movable notches 3021. A push-pull rod 305 is movably arranged between the two movable notches 3021. Both ends of the push-pull rod 305 are slidably provided with claws 303. The inside of the sleeve 302 is provided with guide inclined holes 3022 corresponding to the claws 303. The lower end of the claws 303 slides through the guide inclined holes 3022. By pushing the push-pull rod 305 towards the guide inclined holes 3022, the distance between the two claws 303 is reduced. By pulling the push-pull rod 305 away from the guide inclined holes 3022, the distance between the two claws 303 is increased.

[0028] In use, the push-pull rod 305 can move between the two movable notches 3021. When an external force pushes the push-pull rod 305 toward the guide oblique hole 3022, the lower end of the gripper 303 slides through the guide oblique hole 3022. The guiding effect of the guide oblique hole 3022 causes the gripper 303 to move inward, thereby reducing the distance between the two grippers 303 and clamping the polylactic acid product. Conversely, when the push-pull rod 305 is pulled away from the guide oblique hole 3022, the gripper 303 will move outward under the guidance of the guide oblique hole 3022, increasing the distance between the two grippers 303 and releasing the polylactic acid product.

[0029] See Figure 5 As shown in this embodiment of the invention, a clamping plate 304 is fixedly installed at the end of the gripper 303 away from the push-pull rod 305. The clamping plate 304 is fixed to the end of the gripper 303 away from the push-pull rod 305. When the gripper 303 clamps or releases under the action of the push-pull rod 305, the clamping plate 304 directly contacts the polylactic acid product. The inner side of the gripper 303 is arc-shaped, and the clamping plate 304 increases the contact area with the polylactic acid product, making the clamping force distribution more uniform and more stable in holding the polylactic acid product, avoiding damage caused by excessive local force on the product due to direct clamping by the gripper 303.

[0030] The clamping plate 304 has anti-slip textures 3041, which increase the friction between the clamping plate 304 and the surface of the polylactic acid product. When the clamping plate 304 clamps the polylactic acid product, the anti-slip textures 3041 can effectively prevent the product from sliding relative to the clamping plate 304 during the traction process, ensuring the stability and reliability of the traction process.

[0031] The traction chuck 3 also includes a cylinder 301, and a connecting rod 306 is fixedly installed on the push-pull rod 305. The end of the connecting rod 306 away from the push-pull rod 305 is fixedly connected to the end of the piston rod of the cylinder 301.

[0032] In use, when the piston rod of cylinder 301 extends, the connecting rod 306 drives the push-pull rod 305 to move closer to the guide inclined hole 3022, and the gripper 303 clamps; when the piston rod of cylinder 301 retracts, the connecting rod 306 drives the push-pull rod 305 away from the guide inclined hole 3022, and the gripper 303 releases, so as to realize the automated control of the opening and closing action of the gripper 303.

[0033] See Figure 2 As shown, in this embodiment of the present invention, the mounting component 2 includes a base 201, an L-shaped fixing seat 202, and a mounting seat 203. The base 201 is fixedly mounted on the slide of the electric linear module 1. The bottom of the L-shaped fixing seat 202 is provided with a first waist hole 2021 for fixing and assembling with the base 201 by bolts. One end of the mounting seat 203 is provided with a second waist hole 2031 for fixing and assembling with the upper end of the L-shaped fixing seat 202 by bolts. The cylinder 301 and the sleeve 302 are both fixedly mounted on the end of the mounting seat 203 away from the L-shaped fixing seat 202. The L-shaped fixing seat is provided with reinforcing ribs 2032.

[0034] During installation, the base 201 is fixed to the slide of the electric linear module 1, providing a mounting base for the traction chuck 3. The L-shaped fixing seat 202 is bolted to the base 201 through the first waist hole 2021. The design of the waist hole allows the L-shaped fixing seat 202 to be adjusted horizontally during installation to adapt to different installation requirements. The mounting seat 203 is bolted to the upper end of the L-shaped fixing seat 202 through the second waist hole 2031, allowing for vertical adjustment. The cylinder 301 and the clamp 302 are fixed to the mounting seat 203, allowing for flexible adjustment of the installation position of the traction chuck 3 and facilitating compatibility with extrusion molding machines.

[0035] See Figure 6 As shown, when the polylactic acid product is extruded from the extrusion molding machine, the piston rod of the cylinder 301 extends, the connecting rod 306 pushes the push-pull rod 305 to move towards the guide inclined hole 3022, the gripper 303 moves inward under the guidance of the guide inclined hole 3022, and the anti-slip texture 3041 on the clamping plate 304 contacts the polylactic acid product and clamps it.

[0036] The electric linear module 1 drives the slide to move in a straight line, thereby pulling the clamp 3 to carry the clamped polylactic acid product and achieve traction.

[0037] When the device is pulled to the predetermined position, the piston rod of cylinder 301 retracts, the connecting rod 306 pulls the push-pull rod 305 away from the guide hole 3022, and the gripper 303 moves outward under the guidance of the guide hole 3022, and the clamping plate 304 releases the polylactic acid product. The slide of the electric linear module 1 returns to the initial position, waiting for the next traction operation.

[0038] The foregoing has shown and described the basic principles of the present invention. The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. The above embodiments and descriptions in the specification are only illustrative of the principles of the present invention. Any modifications, equivalent substitutions, and improvements made within the scope of the present invention without departing from the scope of the present invention should be included within the protection scope of the present invention.

Claims

1. The traction mechanism of a polylactic acid solid extrusion molding machine, characterized in that: It includes an electric linear module (1) and a traction clamp (3), wherein the traction clamp (3) is fixedly mounted on the slide of the electric linear module (1) by a mounting member (2); The traction chuck (3) includes a sleeve (302). The top of the sleeve (302) has two symmetrical movable notches (3021). A push-pull rod (305) is movably arranged between the two movable notches (3021). Both ends of the push-pull rod (305) are slidably provided with claws (303). The sleeve (302) has guide inclined holes (3022) that correspond one-to-one with the claws (303). The lower end of the claws (303) slides through the guide inclined holes (3022).

2. The traction mechanism of the polylactic acid solid extrusion molding machine according to claim 1, characterized in that: A clamping plate (304) is fixedly provided at the outer end of the gripper (303) away from the push-pull rod (305).

3. The traction mechanism of the polylactic acid solid extrusion molding machine according to claim 2, characterized in that: The clamping plate (304) has anti-slip texture (3041).

4. The traction mechanism of the polylactic acid solid extrusion molding machine according to claim 1, characterized in that: The traction clamp (3) also includes a cylinder (301), and a connecting rod (306) is fixedly installed on the push-pull rod (305). The outer end of the connecting rod (306) away from the push-pull rod (305) is fixedly connected to the piston rod end of the cylinder (301).

5. The traction mechanism of the polylactic acid solid extrusion molding machine according to claim 4, characterized in that: The mounting component (2) includes a base (201), an L-shaped fixing seat (202), and a mounting seat (203). The base (201) is fixedly mounted on the slide of the electric linear module (1). The bottom of the L-shaped fixing seat (202) is provided with a first waist hole (2021) for bolting and assembling with the base (201). The upper part of the mounting seat (203) is provided with a second waist hole (2031) for bolting and assembling with the upper end of the L-shaped fixing seat (202). The cylinder (301) and the sleeve (302) are both fixedly arranged at the outer end of the mounting seat (203) away from the L-shaped fixing seat (202).

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