A snap-fit ​​device for extrusion die maintenance

By designing a snap-fit ​​device that includes a fixing block, a threaded rod, and a bevel gear, the problem of mold displacement during maintenance in the prior art is solved, achieving stable fixing and flipping of the mold, and improving maintenance efficiency and safety.

CN224426394UActive Publication Date: 2026-06-30TIANJIN XINGLEI MOLD CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
TIANJIN XINGLEI MOLD CO LTD
Filing Date
2025-07-10
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing clamping devices for extrusion die repair are incompatible with complex dies such as those for irregular profiles and multi-layer co-extrusion, causing the die to shift during repair, increasing safety hazards and reducing repair efficiency.

Method used

A clamping device comprising multiple fixing blocks, threaded rods, clamping plates, bevel gears, and cylinder drive was designed. The device achieves mold fixing and flipping through threaded connection and bevel gear meshing, ensuring the stability and operability of the mold during maintenance.

Benefits of technology

This improved the stability and safety of the mold during the maintenance process, ensured maintenance accuracy and efficiency, and reduced safety risks.

✦ Generated by Eureka AI based on patent content.

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Abstract

This utility model relates to the field of extrusion die repair technology, and discloses a clamping device for extrusion die repair, including multiple fourth fixing blocks. A placement plate is fixedly connected to the bottom of each fourth fixing block. A first threaded rod is rotatably connected to the inner wall of each of the fourth fixing blocks. A second sliding block is threadedly connected to the outer wall of each first threaded rod. A second clamping plate is fixedly connected to the outer wall of each second sliding block. A third fixing plate is fixedly connected to the top of the placement plate near its edge. Multiple slide rails are provided on the inner wall of the third fixing plate. Steel pipes are fixedly connected to the outer walls of the multiple second clamping plates near their edges. In this utility model, the extrusion die is placed on the placement plate, and by rotating a second rotating handle, the extrusion die is fixed to the placement plate, ensuring the safety of the repair operation, ensuring repair accuracy and process quality, and improving the convenience and efficiency of the repair operation.
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Description

Technical Field

[0001] This utility model relates to the field of extrusion die repair technology, and in particular to a snap-fit ​​device for extrusion die repair. Background Technology

[0002] Extrusion molds are key tools in the plastics processing industry used to extrude molten plastic raw materials into products with specific cross-sectional shapes. They are widely used in the production of pipes, sheets, profiles, and films. Their working principle is to use an extruder to heat and melt the plastic raw material, and then extrude it into a preset shape through the flow channel and forming die. After cooling and shaping, the final product is formed. From simple pipes to complex profiles, the mold, through precise flow channel control and forming structure, transforms molten plastic into various industrial and civilian products. It is an indispensable key equipment in modern polymer material processing.

[0003] When repairing extrusion dies, clamping devices for extrusion die repair are required for fixing and flipping. Existing clamping devices are mostly designed for specific die types and are difficult to be compatible with the irregular structures of complex dies such as profiles and multi-layer co-extrusion. This causes the extrusion die to shift during the repair process, resulting in incomplete repair, increased safety hazards, and reduced repair efficiency. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a snap-fit ​​device for extrusion die maintenance, which aims to improve the problems of displacement of extrusion dies during maintenance, incomplete maintenance, increased safety hazards, and reduced maintenance efficiency in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a snap-fit ​​device for extrusion mold repair, comprising multiple fourth fixing blocks, a shelf plate fixedly connected to the bottom of each fourth fixing block, a first threaded rod rotatably connected to the inner wall of each of the multiple fourth fixing blocks, a second sliding block threadedly connected to the outer wall of each first threaded rod, a second clamping plate fixedly connected to the outer wall of each second sliding block, a third fixing plate fixedly connected to the top of the shelf plate near its edge, multiple slide rails provided on the inner wall of the third fixing plate, steel pipes fixedly connected to the outer walls of each of the multiple second clamping plates near their edges, a third fixing block on the rear side of the top of the shelf plate, and multiple limiting devices slidably connected to the inner wall of the third fixing block. The device includes a plurality of limiters, each with a slot on its outer wall; a third fixing block with a plurality of limiting through holes on its inner wall; a plurality of aluminum plates fixedly connected to the outer wall of the limiters; a threaded sleeve fixedly connected to the top of the second sliding block; a second threaded rod threadedly connected to the inner wall of the threaded sleeve; a second bevel gear fixedly connected to the top of the second threaded rod; a first bevel gear meshing with the inner wall of the second bevel gear; a first clamping plate rotatably connected to the top of the second bevel gear; a sliding rod fixedly connected to the rear side of the first clamping plate; a sliding sleeve slidably connected to the outer wall of the sliding rod; and rotating mechanisms fixedly connected to the left and right sides of the placement plate, the rotating mechanisms being used to help the user rotate the maintenance mold.

[0006] As a further description of the above technical solution:

[0007] The rotating mechanism includes a first connecting rod, which is fixedly connected to the left and right sides of the shelf. A first side plate is rotatably connected to the outer wall of the left side of the first connecting rod. A first rotating disk is fixedly connected to the front end of the left side of the first connecting rod. A first connecting rod is rotatably connected to the left side of the first rotating disk. A second rotating disk is rotatably connected to the top right side of the first connecting rod. A second connecting rod is fixedly connected to the right side of the second rotating disk. A transmission gear is fixedly connected to the outer wall of the second connecting rod. A third rotating disk is fixedly connected to the right end of the second connecting rod. A second connecting rod is rotatably connected to the right side of the third rotating disk. A fourth rotating disk is rotatably connected to the left side of the second connecting rod. A first fixing plate is fixedly connected to the right side of the first side plate. A second fixing plate is fixedly connected to the right side of the first fixing plate. A cylinder is fixedly connected to the top of the second fixing plate. A first sliding block is fixedly connected to the rear end of the cylinder. A rack is fixedly connected to the bottom of the first sliding block. A base plate is fixedly connected to the bottom of the first side plate. A second side plate is fixedly connected to the top right side of the base plate.

[0008] As a further description of the above technical solution:

[0009] Each of the first bevel gears has a first rotating handle fixedly connected to its outer wall, and a second anti-slip sleeve is fixedly connected to the outer wall of the first rotating handle.

[0010] As a further description of the above technical solution:

[0011] A second rotating handle is fixedly connected to the outer wall of the first threaded rod, and a first anti-slip sleeve is fixedly connected to the outer wall of the second rotating handle.

[0012] As a further description of the above technical solution:

[0013] A first protective sleeve is fixedly connected to the outer wall of the first clamping plate, and a second protective sleeve is fixedly connected to the outer wall of the second clamping plate near the edge.

[0014] As a further description of the above technical solution:

[0015] A storage box is fixedly connected to the left side of the first side plate, and a cushioning rubber pad is fixedly connected to the bottom of the base plate.

[0016] As a further description of the above technical solution:

[0017] The second side plate has multiple screws threaded on its left side near the edge, and the outer wall of each screw has a nameplate.

[0018] As a further description of the above technical solution:

[0019] Multiple first fixing blocks are fixedly connected to the front and rear sides of the base plate, and multiple screws are threadedly connected to the inner walls of the multiple first fixing blocks.

[0020] This utility model has the following beneficial effects:

[0021] 1. In this utility model, the extrusion mold is placed on the shelf. According to the size of the extrusion mold, the extrusion mold is fixed on the shelf by rotating the second rotating handle, which prevents the extrusion mold from moving left and right or up and down, ensuring the safety of maintenance operations, ensuring maintenance accuracy and process quality, and improving the convenience and efficiency of maintenance operations.

[0022] 2. In this utility model, the extrusion mold fixed on the placement plate is driven by a cylinder to move the rack, which in turn drives the transmission gear to rotate, thereby driving the rotation of the third and second rotating disks. The third and second rotating disks drive the rotation of the fourth and first rotating disks respectively through the second and first connecting rods. Thus, through the first connecting rod, horizontal flipping is achieved, creating the optimal process angle for maintenance operations, reducing safety risks during maintenance, and increasing safety and work efficiency during maintenance. Attached Figure Description

[0023] Figure 1 This is a front perspective view of a snap-fit ​​device for repairing an extrusion die proposed in this utility model;

[0024] Figure 2 This is a side view of a snap-fit ​​device for repairing an extrusion die proposed in this utility model;

[0025] Figure 3 This is a top view of a snap-fit ​​device for repairing an extrusion die proposed in this utility model;

[0026] Figure 4 This is a partial structural exploded view of a snap-fit ​​device for repairing an extrusion die proposed in this utility model;

[0027] Figure 5 This is a cross-sectional view of a snap-fit ​​device for repairing an extrusion die proposed in this utility model;

[0028] Figure 6 for Figure 5 A magnified view of a section at point A in the middle;

[0029] Figure 7 for Figure 2 A magnified view of a section at point B in the middle.

[0030] Legend:

[0031] 1. Fourth fixed block; 2. Rotating mechanism; 201. First rotating disk; 202. First connecting rod; 203. Second fixed plate; 204. Second rotating disk; 205. Third rotating disk; 206. Second connecting rod; 207. Fourth rotating disk; 208. Cylinder; 209. First connecting rod; 210. Second side plate; 211. First sliding block; 212. Rack; 213. Transmission gear; 214. Second connecting rod; 215. First fixed block; 216. Screw; 217. Buffer rubber pad; 218. Screw; 219. Nameplate; 220. Storage box; 221. First side plate; 222. 1. Base plate; 2. First fixing plate; 3. First threaded rod; 4. Second sliding block; 5. Threaded sleeve; 6. Second threaded rod; 7. First clamping plate; 8. Second clamping plate; 9. Steel pipe; 10. Storage plate; 11. First bevel gear; 12. Second bevel gear; 13. Sliding rod; 14. Sliding sleeve; 15. Third fixing block; 16. Limiter; 17. Slot; 18. Slide rail; 19. First rotating handle; 20. Second rotating handle; 21. First protective sleeve; 22. Second protective sleeve; 23. First anti-slip sleeve; 24. Second anti-slip sleeve; 25. Aluminum sheet; 26. Limiting through hole; 27. Third fixing plate. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Please see the appendix Figure 1 Appendix Figure 3 and attached Figure 4 This utility model provides an embodiment of a snap-fit ​​device for extrusion mold repair, comprising multiple fourth fixing blocks 1, a shelf 10 fixedly connected to the bottom of each fourth fixing block 1, a first threaded rod 3 rotatably connected to the inner wall of each fourth fixing block 1, a second sliding block 4 threadedly connected to the outer wall of each first threaded rod 3, a second clamping plate 8 fixedly connected to the outer wall of each second sliding block 4, a third fixing plate 27 fixedly connected to the top of the shelf 10 near its edge, multiple slide rails 18 provided on the inner wall of the third fixing plate 27, steel pipes 9 fixedly connected to the outer walls of each second clamping plate 8 near their edges, a third fixing block 15 on the rear side of the top of the shelf 10, and multiple limiters 16 slidably connected to the inner wall of the third fixing block 15. The outer wall of the device 16 is provided with slots 17. The inner wall of the third fixing block 15 is provided with multiple limiting through holes 26. Multiple aluminum plates 25 are fixedly connected to the outer wall of the limiter 16. The top of the second sliding block 4 is fixedly connected with a threaded sleeve 5. The inner wall of the threaded sleeve 5 is threadedly connected with a second threaded rod 6. The top of the second threaded rod 6 is fixedly connected with a second bevel gear 12. The inner wall of the second bevel gear 12 is meshed with a first bevel gear 11. The top of the second bevel gear 12 is rotatably connected with a first clamping plate 7. The rear side of the first clamping plate 7 is fixedly connected with a sliding rod 13. The outer wall of the sliding rod 13 is slidably connected with a sliding sleeve 14. The left and right sides of the shelf 10 are fixedly connected with a rotating mechanism 2. The rotating mechanism 2 is used to help the user rotate the maintenance mold.

[0034] Specifically, the fourth fixed block 1 is internally equipped with a first threaded rod 3. The second rotating handle 20 drives the first threaded rod 3 to rotate. The first threaded rod 3 is fixedly connected to the second sliding block 4, which will cause the second sliding block 4 to move left and right. At the same time, the second clamping plate 8 will move left and right accordingly. A steel pipe 9 is provided on the rear side of the second sliding block 4. The steel pipe 9 will move with the left and right movement of the second sliding block 4. When it moves to a certain position, the limit switch 16 is rotated to fix the position of the second clamping plate 8, ensuring that the position of the second clamping plate 8 will not move. The top of the second sliding block 4 is provided with a threaded sleeve 5. The rotation of the first rotating handle 19 will... The rotation of the first bevel gear 11 drives the rotation of the second bevel gear 12. The second bevel gear 12 is fixed together with the second threaded rod 6. The second threaded rod 6 rotates synchronously inside the threaded sleeve 5, and the first clamping plate 7 moves up and down accordingly. The rear side of the first clamping plate 7 and the second clamping plate 8 is provided with a sliding rod 13 and a sliding sleeve 14, which move up and down with the rotation of the second threaded rod 6. The main function is to fix the position of the extrusion mold, ensuring that the position will not move during maintenance, which facilitates maintenance workers to repair the extrusion mold, provides convenience for maintenance workers, and improves maintenance efficiency.

[0035] Please see the appendix Figure 1 , attached Figure 2 and attached Figure 6 The rotating mechanism 2 includes a first connecting rod 209, which is fixedly connected to the left and right sides of the shelf 10. A first side plate 221 is rotatably connected to the outer wall of the left side of the first connecting rod 209. A first rotating disk 201 is fixedly connected to the front end of the left side of the first rotating disk 209. A first connecting rod 202 is rotatably connected to the left side of the first rotating disk 201. A second rotating disk 204 is rotatably connected to the top right side of the first connecting rod 202. A second connecting rod 214 is fixedly connected to the right side of the second rotating disk 204. A transmission gear 213 is fixedly connected to the outer wall of the second connecting rod 214. A third rotating gear is fixedly connected to the right end of the second connecting rod 214. The third rotating disk 205 is rotatably connected to the right side of the third rotating disk 205 and to the left side of the second rotating disk 206. The first fixed plate 223 is fixedly connected to the right side of the first side plate 221 and to the right side of the first fixed plate 223. The second fixed plate 203 is fixedly connected to the right side of the first fixed plate 223. The cylinder 208 is fixedly connected to the top of the second fixed plate 203. The first sliding block 211 is fixedly connected to the rear end of the cylinder 208. The rack 212 is fixedly connected to the bottom of the first sliding block 211. The bottom of the first side plate 221 is fixedly connected to the bottom plate 222 and to the top right side of the bottom plate 222 is fixedly connected to the second side plate 210.

[0036] Specifically, the operation of cylinder 208 drives rack 212 to move back and forth, which in turn drives transmission gear 213 to rotate. Transmission gear 213 drives third rotating disk 205 to rotate via second connecting rod 214. Third rotating disk 205 drives fourth rotating disk 207 to rotate via second connecting rod 206. Simultaneously, the rotation of transmission gear 213 also drives second rotating disk 204 to rotate. Second rotating disk 204 drives first rotating disk 201 to rotate via first connecting rod 202. First rotating disk 201 and fourth rotating disk 207 will rotate synchronously, which will drive the placement plate 10 to rotate synchronously via first connecting rod 209. This allows maintenance workers to observe the internal structure of the extrusion mold more comprehensively, creating the best process angle for maintenance operations, reducing safety risks during maintenance, and increasing safety and work efficiency during maintenance.

[0037] Please see the appendix Figure 1 , attached Figure 3 and attached Figure 7 The outer walls of multiple first bevel gears 11 are fixedly connected to a first rotating handle 19, the outer walls of the first rotating handle 19 are fixedly connected to a second anti-slip sleeve 24, the outer walls of the first threaded rod 3 are fixedly connected to a second rotating handle 20, the outer walls of the second rotating handle 20 are fixedly connected to a first anti-slip sleeve 23, the outer walls of multiple first clamping plates 7 are fixedly connected to a first protective sleeve 21, and the outer walls of the second clamping plates 8 are fixedly connected to a second protective sleeve 22 near the edge.

[0038] Specifically, the output end of the first bevel gear 11 is provided with a first rotating handle 19, and the outer wall of the first rotating handle 19 is equipped with a second anti-slip sleeve 24. The output end of the first threaded rod 3 is provided with a second rotating handle 20, and the outer wall of the second rotating handle 20 is equipped with a first anti-slip sleeve 23, which serves to prevent slipping and facilitate gripping and rotation. The outer wall of the first clamping plate 7 is provided with a first protective sleeve 21, and the outer wall of the second clamping plate 8 is provided with a second protective sleeve 22 near the edge, which serves to prevent machine wear.

[0039] Please see the appendix Figure 1 , attached Figure 2 and attached Figure 5 A storage box 220 is fixedly connected to the left side of the first side plate 221, a buffer rubber pad 217 is fixedly connected to the bottom of the bottom plate 222, a number of screws 218 are threadedly connected to the left side of the second side plate 210 near the edge, a nameplate 219 is provided on the outer wall of the screws 218, a number of first fixing blocks 215 are fixedly connected to the front and rear sides of the bottom plate 222, and a number of screws 216 are threadedly connected to the inner wall of the number of first fixing blocks 215.

[0040] Specifically, a storage box 220 is provided on the left side of the first side plate 221 to store tools needed for repairing the extrusion mold. A cushioning rubber pad 217 is installed at the bottom of the base plate 222 to cushion the machine and prevent wear. Multiple screws 218 are installed near the edge on the left side of the second side plate 210 to fix the nameplate 219 in the position of the second side plate 210. Multiple first fixing blocks 215 are provided on the front and rear sides of the base plate 222. Multiple screws 216 are provided on the inner wall of the first fixing blocks 215 to facilitate the installation of the snap-fit ​​device for extrusion mold repair and to fix it.

[0041] Working principle: First, place the extrusion mold on the placement plate 10. Depending on the size of the extrusion mold, hold the second rotating handle 20 and rotate it. The second rotating handle 20 will drive the first threaded rod 3 to rotate. Then, the second sliding block 4 will move left and right due to the rotation of the first threaded rod 3, and at the same time, drive the second clamping plate 8 to move left and right, thereby fixing the extrusion mold and preventing it from moving left and right. Then, hold the first rotating handle 19 and rotate it. The first rotating handle 19 will drive the first bevel gear 11 to rotate. The first bevel gear 11 will drive the second bevel gear 12 to rotate. The first clamping plate 7 will move up and down accordingly, thereby fixing the extrusion mold and preventing it from moving up and down, which greatly improves the stability and safety of the extrusion mold.

[0042] Then, the cylinder 208 is activated, and the first sliding block 211 fixed on the cylinder 208 drives the rack 212 to move left and right, thereby driving the transmission gear 213 to rotate. Then the transmission gear 213 drives the third rotating disk 205 and the second rotating disk 204 to rotate. The third rotating disk 205 drives the fourth rotating disk 207 to rotate through the second connecting rod 206. The second rotating disk 204 drives the first rotating disk 201 to rotate through the first connecting rod 202. Thus, the first rotating disk 201 and the fourth rotating disk 207 drive the storage plate 10 to rotate synchronously through the first connecting rod 209, so that the extrusion mold fixed on the storage plate 10 is horizontally flipped, which is convenient for workers to maintain and greatly improves the workers' maintenance efficiency.

[0043] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A clamping device for the repair of an extrusion die comprising a plurality of fourth fixing blocks (1), characterized in that: The bottom of the fourth fixing block (1) is fixedly connected to a shelf (10). The inner walls of the multiple fourth fixing blocks (1) are rotatably connected to a first threaded rod (3). The outer wall of the first threaded rod (3) is threadedly connected to a second sliding block (4). The outer wall of the second sliding block (4) is fixedly connected to a second clamping plate (8). The top of the shelf (10) is fixedly connected to a third fixing plate (27) near the edge. The inner wall of the third fixing plate (27) is provided with multiple slide rails (18). The outer walls of the multiple second clamping plates (8) are fixedly connected to steel pipes (9) near the edge. The rear side of the top of the shelf (10) is a third fixing block (15). The inner wall of the third fixing block (15) is slidably connected to multiple limiters (16). The outer walls of the multiple limiters (16) are provided with slots (17). The inner wall of (15) is provided with multiple limiting through holes (26). The outer wall of the limiter (16) is fixedly connected with multiple aluminum plates (25). The top of the second sliding block (4) is fixedly connected with a threaded sleeve (5). The inner wall of the threaded sleeve (5) is threadedly connected with a second threaded rod (6). The top of the second threaded rod (6) is fixedly connected with a second bevel gear (12). The inner wall of the second bevel gear (12) is meshed with a first bevel gear (11). The top of the second bevel gear (12) is rotatably connected with a first clamping plate (7). The rear side of the first clamping plate (7) is fixedly connected with a sliding rod (13). The outer wall of the sliding rod (13) is slidably connected with a sliding sleeve (14). The left and right sides of the shelf (10) are both fixedly connected with a rotating mechanism (2). The rotating mechanism (2) is used to help the user rotate the maintenance mold.

2. A clamping device for the repair of an extrusion die according to claim 1, characterized in that: The rotating mechanism (2) includes a first connecting rod (209), which is fixedly connected to the left and right sides of the shelf (10). A first side plate (221) is rotatably connected to the outer wall of the left side of the first connecting rod (209). A first rotating disk (201) is fixedly connected to the front end of the left side of the first connecting rod (209). A first connecting rod (202) is rotatably connected to the left side of the first rotating disk (201). A second rotating disk (204) is rotatably connected to the top right side of the first connecting rod (202). A second connecting rod (214) is fixedly connected to the right side of the second rotating disk (204). A transmission gear (213) is fixedly connected to the outer wall of the second connecting rod (214). A third rotating disk is fixedly connected to the right end of the second connecting rod (214). 205), the right side of the third rotating disk (205) is rotatably connected to the second connecting rod (206), the left side of the second connecting rod (206) is rotatably connected to the fourth rotating disk (207), the right side of the first side plate (221) is fixedly connected to the first fixing plate (223), the right side of the first fixing plate (223) is fixedly connected to the second fixing plate (203), the top of the second fixing plate (203) is fixedly connected to the cylinder (208), the rear end of the cylinder (208) is fixedly connected to the first sliding block (211), the bottom of the first sliding block (211) is fixedly connected to the rack (212), the bottom of the first side plate (221) is fixedly connected to the bottom plate (222), and the top right side of the bottom plate (222) is fixedly connected to the second side plate (210).

3. A clamping device for extrusion die repair according to claim 1, characterized in that: Each of the first bevel gears (11) has a first rotating handle (19) fixedly connected to its outer wall, and a second anti-slip sleeve (24) is fixedly connected to the outer wall of the first rotating handle (19).

4. A clamping device for extrusion die repair according to claim 1, characterized in that: The outer wall of the first threaded rod (3) is fixedly connected to a second rotating handle (20), and the outer wall of the second rotating handle (20) is fixedly connected to a first anti-slip sleeve (23).

5. The clamping device for extrusion die maintenance according to claim 1, characterized in that: A first protective sleeve (21) is fixedly connected to the outer wall of a plurality of first clamps (7), and a second protective sleeve (22) is fixedly connected to the outer wall of the second clamp (8) near the edge.

6. A snap-fit ​​device for extrusion die maintenance according to claim 2, characterized in that: A storage box (220) is fixedly connected to the left side of the first side plate (221), and a buffer rubber pad (217) is fixedly connected to the bottom of the bottom plate (222).

7. A snap-fit ​​device for extrusion die maintenance according to claim 2, characterized in that: The second side plate (210) has a plurality of screws (218) threaded on its left side near the edge, and the outer wall of the screws (218) is provided with a nameplate (219).

8. A snap-fit ​​device for extrusion die maintenance according to claim 2, characterized in that: The base plate (222) is fixedly connected to a plurality of first fixing blocks (215) on both the front and rear sides, and the inner walls of the plurality of first fixing blocks (215) are threaded with a plurality of screws (216).