Conductive copper bar extrusion forming die

By setting arc-shaped card blocks and clamping components in the conductive copper extrusion molding mold, the problem of inaccurate movement of the prototype block is solved, and the molding accuracy and efficiency are improved.

CN222580840UActive Publication Date: 2025-03-07CHANGZHOU XIANGPENG COPPER CO LTD
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Patent Information

Application Number
CN202421044214.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-14
Publication Date
2025-03-07
Estimated Expiration
2034-05-14

AI Technical Summary

Technical Problem

In the prior art, during the conductive copper extrusion molding process, it is difficult to ensure that the prototype block is accurately moved directly below the block, resulting in low molding accuracy and reduced efficiency.

Method used

By setting arc-shaped card blocks and clamping components inside the mold box, the arc-shaped card block performs preliminary limits when the prototype block moves below the press block. The clamping component drives the clamping plate to clamp the moving rod through the threaded rod to fix the position of the prototype block to ensure its accurate movement and fixation.

Benefits of technology

The accuracy and efficiency of conductive copper extrusion molding are improved, ensuring that the prototype block is accurately moved under the block, and improving the quality of the finished product.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a conductive copper bar extrusion forming mould, relates to extrusion forming mould technical field, including box body, press block, prototype block and lift gate, the utility model discloses an arc-shaped fixture block, arc-shaped fixture block can be clamped inside arc-shaped groove when the prototype block moves right under the press block, thereby the prototype block carries out preliminary limit, and the lift gate is fixed in the box body. The position of a prototype block is conveniently determined through visual inspection, the precision of extrusion forming of a pressing block on a conductive copper bar is improved, a clamping assembly is arranged, a threaded rod is rotated to drive a clamping plate to be separated from a moving rod, and the moving rod can be conveniently moved left and right to drive the prototype block and a first T-shaped sliding block to slide in a moving groove; and the driving assembly is arranged, a lifting door is moved upwards to open the lifting door, meanwhile, the collecting box can be driven to move outwards, the conductive copper bar subjected to extrusion forming in the collecting box can be conveniently taken out, and the extrusion forming efficiency of the device is further improved.
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Description

Technical Field

[0001] The utility model relates to the technical field of extrusion molding dies, in particular to an extrusion molding die for conductive copper bars. Background Art

[0002] Copper busbar is an indispensable conductive material for manufacturing motor windings, high and low voltage electrical appliances, switch contacts, and wires for power distribution installation. It has high mechanical properties, good electrical conductivity and thermal conductivity, excellent corrosion resistance, electroplating and brazing properties, beautiful metallic luster and good forming and processing performance. The cross-section of copper busbar is mostly rectangular or chamfered rectangular. In the production process of copper busbar, hydraulic method is usually used to extrude the copper raw material block through a mold.

[0003] For example, an extrusion molding die disclosed in the utility model with authorization announcement number CN220480130U installs push grooves on both sides of a box body. A push plate can drive the prototype block in the push groove to move, thereby moving the prototype block to the bottom of the pressing block as needed. No person is required to take and place the prototype block. By using an observation window in conjunction with the upper and lower box doors, the extrusion process of the device can be carried out inside the box body, thereby improving the safety of operation.

[0004] This prior art also has the following problems when used:

[0005] During the process of moving the prototype block by the device, it is difficult to move the required prototype block to the bottom of the pressing block by visual inspection through the side observation window, which affects the accuracy of the pressing block extrusion molding and reduces the quality of the conductive copper busbar. Since the material of the slider is rubber, it is difficult to push the prototype block manually, which reduces the efficiency of the extrusion molding of the device. Utility Model Content

[0006] In order to overcome the deficiencies of the prior art, the utility model provides a conductive copper bar extrusion forming die to solve the technical problems mentioned in the above background.

[0007] In order to solve the above technical problems, the utility model provides the following technical solutions: a conductive copper bar extrusion forming die, comprising a box body, a pressing block, a prototype block and a lifting door, wherein the box body is provided with a pressing block and a plurality of prototype blocks, and the outer side of the box body is slidably connected with a lifting door;

[0008] An arc-shaped clamping block is arranged inside the box body, and the arc-shaped clamping block can initially limit the prototype block when the prototype block moves to just below the pressing block;

[0009] The clamping assembly is arranged outside the box body, and the clamping assembly can conveniently limit and fix the position of the prototype block;

[0010] The driving component is arranged on the side of the lifting door. The driving component can drive the extruded conductive copper busbar to move outward while opening the lifting door.

[0011] As a preferred technical solution of the utility model, a hydraulic cylinder is fixedly installed on the top surface of the box body, the output end of the hydraulic cylinder passes through the box body and is slidably connected to the box body, the bottom surface of the output end of the hydraulic cylinder is fixedly connected to the pressure block, the outside of the box body is connected with a feed port, a collection box is provided below the pressure block inside the box body, and a shock-absorbing plate is provided on the bottom surface of the collection box.

[0012] As an optimal technical solution of the utility model, multiple prototype blocks are fixedly connected in sequence, and a moving groove is slidably connected to the outer side of the prototype block. The outer side of the moving groove is fixedly connected to the inner wall of the box body, and a moving rod is fixedly arranged on the outer side of the prototype block. The moving rod passes through the box body and the moving groove respectively and is slidably connected to the box body and the moving groove respectively. Symmetrical limiting grooves are arranged on the inner side of the moving groove. The inner wall of the limiting groove is slidably connected to the arc-shaped clamping block. A reset spring is fixedly arranged between the arc-shaped clamping block and the inner wall of the limiting groove. Symmetrical first T-shaped sliding blocks are fixedly arranged on the left and right sides of the prototype block, and a first T-shaped sliding groove adapted to the first T-shaped sliding block is arranged on the inner side of the moving groove. The first T-shaped sliding block is slidably connected to the moving groove through the first T-shaped sliding groove, and the first T-shaped sliding groove is communicated with the limiting groove. Arc grooves adapted to the arc-shaped clamping blocks are arranged on the outer side of the first T-shaped sliding block.

[0013] As a preferred technical solution of the utility model, the clamping assembly includes a clamping plate, a first connecting rod, a lifting block, a fixed plate, a threaded rod and a second T-shaped slider. Symmetrical clamping plates are arranged on the left and right sides of the moving rod. The top surface of the clamping plate is hinged with the first connecting rod, and the other end of the first connecting rod is hinged with the lifting block. A threaded rod is arranged through the inside of the lifting block. The bottom of the threaded rod is rotatably connected to the fixed plate through a bearing, and the second T-shaped slider is fixedly arranged on the side of the clamping plate close to the box body.

[0014] As a preferred technical solution of the utility model, the lifting block is threadedly connected to the threaded rod, the back side of the fixed plate is fixedly connected to the box body, and a second T-shaped slide groove adapted to the second T-shaped slide groove is provided on the side of the box body close to the clamping plate, and the second T-shaped slide groove is slidably connected to the box body.

[0015] As a preferred technical solution of the utility model, the driving assembly includes a support plate, a second connecting rod, a bolt, a first threaded hole and a second threaded hole. The second connecting rod is hinged on the side of the lifting door, and the other end of the second connecting rod is hinged on the support plate. Bolts are arranged through the inside of the lifting door, and the first threaded hole and the second threaded hole are respectively arranged on the side of the box body.

[0016] As a preferred technical solution of the utility model, the bottom surface of the support plate is slidably connected to the bottom surface of the box body, the top surface of the support plate is fixedly connected to the collection box, the lifting door is threadedly connected to the bolt, and the bolt is threadedly connected to the box body through the first threaded hole and the second threaded hole respectively.

[0017] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0018] The utility model provides an arc-shaped clamping block, which can be engaged with the inside of the arc-shaped groove when the prototype block moves to the bottom of the pressing block, thereby performing preliminary positioning of the prototype block, facilitating visual determination of the position of the prototype block, and improving the precision of the pressing block in extruding and molding the conductive copper busbar. By providing a clamping assembly, the threaded rod is rotated to drive the clamping plate to clamp the moving rod at the same time, so that the moving rod can be clamped and fixed, thereby limiting and fixing the position of the prototype block. The threaded rod is rotated in the opposite direction to drive the clamping plate to disengage from the moving rod, so that the moving rod can be conveniently moved left and right to drive the prototype block and the first T-shaped slider to slide in the moving groove, thereby improving the efficiency of the device in extruding and molding the conductive copper busbar. By providing a driving assembly, the lifting door can be moved upward to open the lifting door, and at the same time, the collection box can be driven to move outward, thereby facilitating the removal of the conductive copper busbar that has been extruded inside the collection box, and further improving the efficiency of the device in extruding and molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of the main view of the utility model;

[0021] Figure 3 It is a schematic diagram of the cross-sectional structure of the left side view of the utility model;

[0022] Figure 4 It is a schematic diagram of the cross-sectional structure of the utility model in top view;

[0023] Among them: 1. Box body; 2. Hydraulic cylinder; 3. Press block; 4. Feed port; 5. Moving rod; 6. Moving groove; 7. Prototype block; 8. First T-shaped slider; 9. Arc groove; 10. Collection box; 11. Clamping plate; 12. First connecting rod; 13. Lifting block; 14. Fixed plate; 15. Threaded rod; 16. Second T-shaped slider; 17. Arc block; 18. Reset spring; 19. Shock-absorbing plate; 20. Support plate; 21. Second connecting rod; 22. Lifting door; 23. Bolt; 24. First threaded hole; 25. Second threaded hole. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0025] Example

[0026] Please refer to Figure 1-Figure 4 As shown, the utility model provides a conductive copper bar extrusion forming die, including a box body 1, a pressing block 3, a prototype block 7 and a lifting door 22. A hydraulic cylinder 2 is fixedly installed on the top surface of the box body 1. The output end of the hydraulic cylinder 2 penetrates the box body 1 and is slidably connected to the box body 1. A pressing block 3 is fixedly arranged on the bottom surface of the output end of the hydraulic cylinder 2. A feeding port 4 is arranged on the outside of the box body 1. The feeding port 4 can facilitate the copper raw material block to extend into the box body 1. A collecting box 10 and a plurality of prototype blocks 7 are arranged below the pressing block 3 inside the box body 1. The prototype blocks 7 are respectively penetrated with different shapes. Vertical slot, move the required prototype block 7 to just below the pressing block 3, and then extend the copper raw material block into the top surface of the prototype block 7 inside the box body 1 along the feed port 4, and run the hydraulic cylinder 2 to drive the pressing block 3 to move downward to extrude the copper raw material block. A shock-absorbing plate 19 is provided on the bottom surface of the collection box 10. The shock-absorbing plate 19 will cushion the conductive copper busbar to prevent damage to the finished product due to falling. The collection box 10 cooperates with the shock-absorbing plate 19 to collect the conductive copper busbar that has been extruded. A lifting door 22 is slidably connected to the outside of the box body 1, and a visual window is provided on the back of the box body 1.

[0027] like Figure 1-Figure 4As shown, a plurality of prototype blocks 7 are fixedly connected in sequence, a moving rod 5 is fixedly arranged on the outer side of the prototype block 7, the moving rod 5 penetrates the box body 1 and is slidably connected to the box body 1, a moving groove 6 is slidably connected to the outer side of the prototype block 7, the outer side of the moving groove 6 is fixedly connected to the inner wall of the box body 1, the moving rod 5 penetrates the moving groove 6 and is slidably connected to the moving groove 6, symmetrical first T-shaped sliding blocks 8 are fixedly arranged on the left and right sides of the prototype block 7, a first T-shaped sliding groove adapted to the first T-shaped sliding block 8 is arranged on the inner side of the moving groove 6, the first T-shaped sliding block 8 is slidably connected to the moving groove 6 through the first T-shaped sliding groove, the inner wall of the first T-shaped sliding groove inside the moving groove 6 is connected to a symmetrical limiting groove, the inner wall of the limiting groove is slidably connected to an arc-shaped card block 17, and the arc-shaped card block 17 is slidably connected to the inner wall of the limiting groove. A reset spring 18 is fixedly arranged between the clamping block 17 and the inner wall of the limiting groove. An arc groove 9 adapted to the arc clamping block 17 is arranged on the outer side of the first T-shaped sliding block 8. When the prototype block 7 moves to just below the pressing block 3, the arc clamping block 17 is just aligned with the arc grooves 9 on the left and right sides of the prototype block 7. The reset spring 18 pushes the arc clamping block 17 to move outward and engages with the inside of the arc groove 9, thereby performing preliminary positioning of the prototype block 7, facilitating the position of the prototype block 7 to be determined by visual inspection, improving the accuracy of the extrusion molding of the conductive copper busbar by the pressing block 3, and increasing the force on the moving rod 5 to drive the arc clamping block 17 to move inward to the inside of the limiting groove at the same time. The reset spring 18 is compressed, thereby driving the prototype block 7 to continue to move.

[0028] like Figure 1-Figure 4 As shown, a clamping assembly is arranged outside the box body 1, and the clamping assembly consists of a clamping plate 11, a first connecting rod 12, a lifting block 13, a fixed plate 14, a threaded rod 15 and a second T-shaped slider 16. Symmetrical clamping plates 11 are arranged on the left and right sides of the moving rod 5, and a rubber anti-skid pad is adhered to the inner side of the clamping plate 11. The top surface of the clamping plate 11 is hinged with the first connecting rod 12, and the other end of the first connecting rod 12 is hinged with the lifting block 13. A threaded rod 15 is arranged inside the lifting block 13, and the lifting block 13 is threadedly connected to the threaded rod 15. The bottom of the threaded rod 15 is rotatably connected to the fixing plate 14 through a bearing, and the back of the fixing plate 14 is fixedly connected to the box body 1. The clamping plate 11 A second T-shaped slider 16 is fixedly provided on one side close to the box body 1, and a second T-shaped groove adapted to the second T-shaped slider 16 is provided on one side of the box body 1 close to the clamping plate 11. The second T-shaped slider 16 is slidably connected to the box body 1 through the second T-shaped groove. The threaded rod 15 is rotated to drive the clamping plate 11 to clamp the moving rod 5 at the same time, so that the moving rod 5 can be clamped and fixed, thereby limiting and fixing the position of the prototype block 7. The threaded rod 15 is rotated in the opposite direction to drive the clamping plate 11 to disengage from the moving rod 5, so that the moving rod 5 can be conveniently moved left and right to drive the prototype block 7 and the first T-shaped slider 8 to slide in the moving groove 6, thereby improving the efficiency of the device in extruding the conductive copper busbar.

[0029] Specifically, rotating the threaded rod 15 can drive the lifting block 13 to move upward along the threaded rod 15. The movement of the lifting block 13 drives the first connecting rod 12 to rotate at the same time. The rotation of the first connecting rod 12 drives the clamping plate 11 to move inward at the same time until the inner side of the clamping plate 11 is tightly against the moving rod 5, clamping and fixing the moving rod 5. Rotating the threaded rod 15 in the opposite direction can drive the clamping plate 11 to move away from the moving rod 5 at the same time, thereby releasing the limit on the moving rod 5.

[0030] like Figure 1-Figure 4 As shown, a driving assembly is arranged on the side of the lifting door 22, and the driving assembly consists of a support plate 20, a second connecting rod 21, a bolt 23, a first threaded hole 24 and a second threaded hole 25. The second connecting rod 21 is hinged on the side of the lifting door 22, and the other end of the second connecting rod 21 is hinged on the support plate 20. The bottom surface of the support plate 20 is slidably connected to the bottom surface of the inside of the box body 1, and the top surface of the support plate 20 is fixedly connected to the collection box 10. Bolts 23 are arranged throughout the inside of the lifting door 22, and the lifting door 22 is threadedly connected with the bolts 23. The first threaded hole 24 and the second threaded hole 25 are respectively arranged on the side of the box body 1. The bolts 23 are threadedly connected to the box body 1 through the first threaded hole 24 and the second threaded hole 25, respectively. The bolts 23 are threadedly connected to the box body 1 through the first threaded hole 24 and the second threaded hole 25, and the bolts 23 are rotated. By disengaging the bolt 23 from the first threaded hole 24, the lifting door 22 can be easily opened. The lifting door 22 can be moved upward to open the lifting door 22, and the second connecting rod 21 can be driven to rotate. The rotation of the second connecting rod 21 drives the support plate 20 to move outward, thereby driving the collection box 10 to move outward. When the lifting door 22 moves to the highest position, the bolt 23 is just aligned with the second threaded hole 25. The bolt 23 is rotated so that the bolt 23 is threadedly connected to the box body 1 through the second threaded hole 25, and the lifting door 22 is limited after opening. At this time, the collection box 10 is completely moved to the outside of the box body 1, so that the conductive copper busbar that has been extruded inside the collection box 10 can be easily taken out, thereby further improving the efficiency of the extrusion molding of the device.

[0031] Specific working principle:

[0032] When the device is in use, the threaded rod 15 is rotated to drive the lifting block 13 to move downward along the threaded rod 15. The movement of the lifting block 13 drives the first connecting rod 12 to rotate at the same time. The rotation of the first connecting rod 12 drives the clamping plate 11 to move outward at the same time until the inner side of the clamping plate 11 is away from the moving rod 5, thereby releasing the limit on the moving rod 5. The moving rod 5 is moved left and right to drive the required prototype block 7 to move to the bottom of the pressing block 3. When the prototype block 7 moves to the bottom of the pressing block 3, the arc-shaped clamping block 17 is just aligned with the arc-shaped grooves 9 on the left and right sides of the prototype block 7. The reset spring 18 pushes the arc-shaped clamping block 17 to move outward and engage with the arc-shaped clamping block 17. The inside of the groove 9, thereby preliminarily limiting the position of the prototype block 7, making it convenient to visually determine the position of the prototype block 7 through the observation window, and improving the accuracy of the pressing block 3 in extruding the conductive copper busbar. The threaded rod 15 is rotated in the opposite direction to drive the clamping plate 11 to be close to the moving rod 5 at the same time, and the moving rod 5 is clamped and fixed, thereby limiting and fixing the position of the prototype block 7. The copper raw material block is extended into the top surface of the prototype block 7 inside the box body 1 along the feed port 4, and the hydraulic cylinder 2 is operated to drive the pressing block 3 to move downward to extrude the copper raw material block. The collecting box 10 cooperates with the shock-absorbing plate 19 to collect the conductive copper busbar that has been extruded.

[0033] After the device completes the extrusion molding of the conductive copper busbar, the bolt 23 is rotated to disengage the bolt 23 from the first threaded hole 24, and the lifting door 22 is moved upward to open the lifting door 22 while driving the second connecting rod 21 to rotate. The rotation of the second connecting rod 21 drives the support plate 20 to move outward, thereby driving the collection box 10 to move outward. When the lifting door 22 moves to the highest position, the bolt 23 is just aligned with the second threaded hole 25. The bolt 23 is rotated so that the bolt 23 is threadedly connected to the box body 1 through the second threaded hole 25, and the lifting door 22 is limited after it is opened. At this time, the collection box 10 is completely moved to the outside of the box body 1, so that it is convenient to take out the conductive copper busbar that has been extruded inside the collection box 10, thereby improving the extrusion molding efficiency of the device.

[0034] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A conductive copper bar extrusion forming die, comprising a box (1), a pressing block (3), a prototype block (7) and a lifting door (22), wherein the box (1) is provided with a pressing block (3) and a plurality of prototype blocks (7), and the outer side of the box (1) is slidably connected with a lifting door (22), characterized in that: An arc-shaped clamping block (17), wherein the arc-shaped clamping block (17) is arranged inside the box body (1), and the arc-shaped clamping block (17) can initially limit the position of the prototype block (7) when the prototype block (7) moves to the position directly below the pressing block (3); A clamping assembly, the clamping assembly is arranged outside the box body (1), and the clamping assembly can conveniently limit and fix the position of the prototype block (7); A driving component is arranged on the side of the lifting door (22), and the driving component can drive the extruded conductive copper busbar to move outwards while opening the lifting door (22).

2. The conductive copper bar extrusion forming die according to claim 1, characterized in that: A hydraulic cylinder (2) is fixedly mounted on the top surface of the box body (1); the output end of the hydraulic cylinder (2) passes through the box body (1) and is slidably connected to the box body (1); the bottom surface of the output end of the hydraulic cylinder (2) is fixedly connected to the pressing block (3); a feed port (4) is provided on the outside of the box body (1); a collection box (10) is provided below the pressing block (3) inside the box body (1); and a shock absorbing plate (19) is provided on the bottom surface of the collection box (10).

3. The conductive copper bar extrusion forming die according to claim 1, characterized in that: A plurality of the prototype blocks (7) are fixedly connected in sequence, a movable groove (6) is slidably connected to the outer side of the prototype block (7), the outer side of the movable groove (6) is fixedly connected to the inner wall of the box body (1), a movable rod (5) is fixedly arranged on the outer side of the prototype block (7), the movable rod (5) respectively penetrates the box body (1) and the movable groove (6) and is slidably connected to the box body (1) and the movable groove (6), a symmetrical limiting groove is arranged on the inner side of the movable groove (6), the inner wall of the limiting groove is slidably connected to the arc-shaped clamping block (17), and the arc A return spring (18) is fixedly arranged between the arc-shaped block (17) and the inner wall of the limiting groove, symmetrical first T-shaped sliding blocks (8) are fixedly arranged on the left and right sides of the prototype block (7), a first T-shaped sliding groove adapted to the first T-shaped sliding block (8) is arranged inside the movable groove (6), the first T-shaped sliding block (8) is slidably connected to the movable groove (6) through the first T-shaped sliding groove, the first T-shaped sliding groove is connected to the limiting groove, and an arc-shaped groove (9) adapted to the arc-shaped block (17) is arranged outside the first T-shaped sliding block (8).

4. The conductive copper bar extrusion forming die according to claim 3, characterized in that: The clamping assembly comprises a clamping plate (11), a first connecting rod (12), a lifting block (13), a fixed plate (14), a threaded rod (15) and a second T-shaped slider (16); the left and right sides of the movable rod (5) are provided with symmetrical clamping plates (11); the top surface of the clamping plate (11) is hinged with the first connecting rod (12); the other end of the first connecting rod (12) is hinged with the lifting block (13); a threaded rod (15) is provided inside the lifting block (13); the bottom of the threaded rod (15) is rotatably connected to the fixed plate (14) via a bearing; and a second T-shaped slider (16) is fixedly provided on one side of the clamping plate (11) close to the box body (1).

5. The conductive copper bar extrusion forming die according to claim 4, characterized in that: The lifting block (13) is threadedly connected to the threaded rod (15); the back side of the fixing plate (14) is fixedly connected to the box body (1); a second T-shaped sliding groove adapted to fit the second T-shaped sliding block (16) is provided on one side of the box body (1) close to the clamping plate (11); the second T-shaped sliding block (16) is slidably connected to the box body (1) via the second T-shaped sliding groove.

6. The conductive copper bar extrusion forming die according to claim 2, characterized in that: The driving assembly comprises a support plate (20), a second connecting rod (21), a bolt (23), a first threaded hole (24) and a second threaded hole (25); the side of the lifting door (22) is hinged with the second connecting rod (21); the other end of the second connecting rod (21) is hinged with the support plate (20); the inside of the lifting door (22) is penetrated by a bolt (23); and the side of the box body (1) is respectively provided with a first threaded hole (24) and a second threaded hole (25).

7. The conductive copper bar extrusion forming die according to claim 6, characterized in that: The bottom surface of the support plate (20) is slidably connected to the bottom surface of the interior of the box body (1), the top surface of the support plate (20) is fixedly connected to the collection box (10), the lifting door (22) is threadedly connected to the bolt (23), and the bolt (23) is threadedly connected to the box body (1) through a first threaded hole (24) and a second threaded hole (25), respectively.

Citation Information

Patent Citations

  • Extrusion forming die

    CN220480130U