Clamping and assembling equipment for super-capacitor aluminum shell machining

By designing automated clamping and assembly equipment, using gravity and mechanical structure to adjust the position of the aluminum shell, the aluminum shell opening can be inserted into the fixture upward, solving the problem of manually determining the opening and improving processing efficiency and automation.

CN120727482APending Publication Date: 2025-09-30SHENZHEN FAZI PLASTIC PROD CO LTD
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Patent Information

Application Number
CN202511067495.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-31
Publication Date
2025-09-30

AI Technical Summary

Technical Problem

The existing capacitor aluminum shell clamping process requires manual determination of the opening, which increases the workload and affects processing efficiency.

Method used

A clamping and assembly device is designed, including a processing frame, a support frame, a clamp, a drive mechanism and an adjustment mechanism. The position of the aluminum shell is automatically adjusted by gravity and a mechanical structure so that its opening is inserted into the clamp upward, and the automatic operation of clamping and unloading is realized through the drive mechanism.

Benefits of technology

It reduces manual operations, improves aluminum shell processing efficiency and quality, reduces costs, and improves the degree of automation.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to the technical field of super capacitor aluminum shell machining, in particular to clamping and assembling equipment for super capacitor aluminum shell machining, which comprises a machining frame body and a conveying frame, a supporting frame is arranged in the machining frame body, and the supporting frame is rotationally connected with the machining frame body through a rotating mechanism; two sets of clamps are slidably installed above the supporting frame, a driving mechanism for driving the two sets of clamps to be close to each other or away from each other is arranged between the two sets of clamps, the conveying frame is fixedly installed on one side of the machining frame body and is in an inclined shape, and an adjusting mechanism capable of driving the aluminum shell to rotate is arranged above the conveying frame. By arranging the inclined conveying frame, the aluminum shell can be automatically conveyed under the action of gravity, and by arranging the telescopic adjusting plate and under the cooperation of the guide groove, the aluminum shell can be adjusted according to the state of the aluminum shell, so that the aluminum shell can be always inserted between the two sets of clamps with an upward opening, and the aluminum shell does not need to be manually inserted between the two sets of clamps.
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Description

Technical Field

[0001] The present invention relates to the technical field of supercapacitor aluminum shell processing, and in particular to a clamping and assembling device for supercapacitor aluminum shell processing. Background Art

[0002] Capacitors are energy storage components that are widely used in the manufacture of modern electronic products and are important components of control circuit boards. There are various types of capacitors, among which paper capacitors are mostly cylindrical in shape, with aluminum foil, tin foil and wax-impregnated paper wound inside. After stacking, they are rolled into a cylinder and wrapped with moisture-proof material. The outer shell is made of a sealed iron shell to improve moisture-proof performance. When assembling paper capacitors, it is necessary to use clamping tooling to fix the sealed shell so that the aluminum shell and capacitor core can be assembled.

[0003] When clamping the existing capacitor aluminum shell, it is necessary to manually determine the opening of the aluminum shell and place the aluminum shell into the clamping device with the opening facing upward, which increases the workload of the staff and affects the processing efficiency. Summary of the Invention

[0004] The object of the present invention is to provide a clamping and assembling device for processing supercapacitor aluminum shells to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a clamping and assembly device for processing supercapacitor aluminum shells, comprising a processing frame and a conveying frame, a support frame being arranged inside the processing frame, the support frame being rotatably connected to the processing frame through a rotating mechanism, two groups of clamps being slidably installed above the support frame, a driving mechanism being arranged between the two groups of clamps for driving the two groups of clamps to move closer to or away from each other, the conveying frame being fixedly mounted on one side of the processing frame, the conveying frame being inclined, two groups of guide plates being fixedly mounted above the conveying frame, the two groups of guide plates being combined in a Y-shape, an adjustment mechanism being arranged above the conveying frame for driving the aluminum shell to rotate, and the adjustment mechanism being located between the guide plate and the processing frame.

[0006] Preferably, the driving mechanism includes an adjusting block, a connecting plate and a fixed block. There are two groups of adjusting blocks, and the two groups of adjusting blocks are respectively arranged on both sides of the support frame. Connecting plates are rotatably installed on both sides of the adjusting block, and the two groups of connecting plates are rotatably connected to the two groups of clamps at one end away from the adjusting block. There are two groups of fixed blocks, and the two groups of fixed blocks are fixedly connected to the processing frame. One group of fixed blocks is arranged vertically, and the other group of fixed blocks is inclined. The fixed blocks are in contact and cooperate with the adjusting blocks.

[0007] Preferably, the driving mechanism also includes a sliding rod and a No. 1 spring, the sliding rod is fixedly installed above the support frame, the sliding rod and the clamp are slidingly connected, the No. 1 spring is movably sleeved on the circumferential outer surface of the sliding rod, and the No. 1 spring and the clamp are fixedly connected.

[0008] Preferably, the rotating mechanism includes a rotating shaft, a shaft and a rotating motor. The rotating shaft is fixedly inserted inside the support frame. The shaft is rotatably connected to the rotating shaft through an elastic structure. The shaft is rotatably connected to the processing frame. One group of the shafts is fixedly connected to the output end of the rotating motor away from the rotating shaft. The rotating motor is fixedly connected to the processing frame.

[0009] Preferably, the elastic structure includes a groove, a push block and an airbag, the groove is opened at one end of the rotating shaft close to the shaft member, the push block is fixedly installed on the outside of one side of the shaft member close to the rotating shaft, and the push block is slidably connected to the groove through the airbag.

[0010] Preferably, the adjustment mechanism includes a guide groove, an adjustment plate, a connecting column, a sleeve and a No. 2 spring. The guide groove is opened on the upper surface of the conveying frame. The sleeve passes through the conveying frame through a movable component. The connecting column is slidably inserted into the interior of the sleeve through the No. 2 spring. The adjustment plate is fixedly installed on the outside of the connecting column close to the guide plate. The upper end surface of the adjustment plate close to the guide plate is inclined.

[0011] Preferably, the moving assembly includes a support block and an electric push rod, the support block is rotatably installed below the sleeve, the support block and the conveying frame are slidably connected, the electric push rod is fixedly installed below the conveying frame, the electric push rod is located between the support block and the guide plate, and the output end of the electric push rod is fixedly connected to the support block.

[0012] Preferably, a gear is fixedly mounted on the outer surface of the sleeve, and a rack is fixedly mounted on the lower side of the conveying frame, and the gear and the rack are meshed with each other.

[0013] Preferably, limit plates are provided on both sides of the adjustment plate, the limit plates are connected to the adjustment plate via a movable structure, and a rubber piece is fixedly installed on one side of the limit plate away from the adjustment plate.

[0014] Preferably, the movable structure includes a mounting plate, the mounting plate and the adjustment plate are slidably connected, a cross bar is fixedly installed inside the mounting plate, and a No. 3 spring is provided on the outer movable sleeve of the cross bar. The limit plate is slidably connected to the cross bar through the No. 3 spring, and a push plate is rotatably installed on the side of the limit plate close to the connecting column, and the push plate is rotatably connected to the adjustment plate at one end away from the limit plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up an inclined conveyor frame, the aluminum shell can be automatically conveyed under the action of gravity. By setting up a retractable adjustment plate, in cooperation with the guide groove, the aluminum shell can be adjusted according to the state of the aluminum shell, so that the aluminum shell can always be inserted between the two sets of clamps with the opening facing upward. There is no need to manually insert the aluminum shell between the two sets of clamps, which reduces the workload of the staff, improves the efficiency of aluminum shell processing, and also ensures the quality of aluminum shell processing.

[0016] 2. Setting and adjusting the angle of rotation of the fixture allows the aluminum shell to automatically fall between the two sets of fixtures under the action of gravity, which is beneficial to reducing the cost of aluminum shell processing and can unload the aluminum shell after processing, which is beneficial to improving the degree of automation of aluminum shell processing and further improving the efficiency of aluminum shell processing.

[0017] 3. By setting the fixed block, the two sets of clamps can be kept away from each other when the clamps are moved to the corresponding positions, which is convenient for loading and unloading the aluminum shell and helps to improve the efficiency of aluminum shell processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a partial structural cross-sectional view of the present invention; Figure 3 For the present invention Figure 2 A magnified view of point A; Figure 4 It is a partial structural exploded perspective view of the present invention; Figure 5 It is a schematic diagram of the local structure of the present invention; Figure 6 It is a partial structural cross-sectional view of the present invention; Figure 7 A cross-sectional view of a portion of the structure of the present invention; Figure 8 For the present invention Figure 7 Enlarged view of point B.

[0019] In the accompanying drawings, the list of parts represented by each number is as follows: 1. Processing frame; 2. Support frame; 3. Clamp; 4. Slide rod; 5. Spring No. 1; 6. Adjustment block; 7. Connecting plate; 8. Rotating shaft; 9. Shaft; 10. Groove; 11. Push block; 12. Airbag; 13. Rotating motor; 14. Conveyor frame; 15. Guide plate; 16. Guide groove; 17. Adjustment plate; 18. Connecting column; 19. Sleeve; 20. Spring No. 2; 21. Support block; 22. Electric push rod; 23. Gear; 24. Rack; 25. Mounting plate; 26. Push plate; 27. Limiting plate; 28. Rubber part; 29. ​​Cross bar; 30. Spring No. 3; 31. Fixed block. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figures 1-8 The figure shows a clamping and assembly device for processing supercapacitor aluminum shells, including a processing frame 1 and a conveying frame 14. A support frame 2 is provided inside the processing frame 1, and the support frame 2 is rotatably connected to the processing frame 1 through a rotating mechanism. Two groups of clamps 3 are slidably installed above the support frame 2, and a driving mechanism is provided between the two groups of clamps 3 to drive the two groups of clamps 3 to move closer to or away from each other. The conveying frame 14 is fixedly installed on one side of the processing frame 1, and the conveying frame 14 is inclined. Two groups of guide plates 15 are fixedly installed above the conveying frame 14, and the two groups of guide plates 15 are combined in a Y-shaped design. An adjustment mechanism that can drive the aluminum shell to rotate is provided above the conveying frame 14, and the adjustment mechanism is located between the guide plate 15 and the processing frame 1.

[0022] Under the action of gravity, the aluminum shell moves on the surface of the conveyor frame 14. Under the action of the guide plate 15, the aluminum shell can be adjusted to be parallel to the length direction of the conveyor frame 14. The adjustment mechanism can adjust the aluminum shell so that the aluminum shell can be inserted between the two sets of clamps 3 with the opening facing upward. It should be noted that in the initial state, the clamp 3 is inclined, and the angle of the clamp 3 is the same as the angle of the conveyor frame 14. After the aluminum shell is located between the two sets of clamps 3, the rotating mechanism drives the clamp 3 to rotate away from the conveyor frame 14. At this time, the driving mechanism drives the two sets of clamps 3 to approach each other so that the clamp 3 can clamp the aluminum shell. When the clamp 3 rotates to a vertical state, the aluminum shell opens upward, and the processing device can process the aluminum shell. After the processing is completed, the rotating mechanism continues to drive the clamp 3 to rotate one hundred and eighty degrees so that the aluminum shell opens downward. At this time, the driving mechanism can drive the two sets of clamps 3 away from each other, which is convenient for unloading the aluminum shell and is beneficial to improving the efficiency of aluminum shell processing.

[0023] Specifically, the driving mechanism includes an adjusting block 6, a connecting plate 7 and a fixed block 31. There are two groups of adjusting blocks 6, and the two groups of adjusting blocks 6 are respectively arranged on both sides of the support frame 2. Connecting plates 7 are rotatably installed on both sides of the adjusting block 6. The two groups of connecting plates 7 are rotatably connected to the two groups of clamps 3 at one end away from the adjusting block 6. There are two groups of fixed blocks 31, and the two groups of fixed blocks 31 are fixedly connected to the processing frame 1. One group of fixed blocks 31 is arranged vertically, and the other group of fixed blocks 31 is inclined. The fixed blocks 31 are in contact and cooperate with the adjusting blocks 6.

[0024] The driving mechanism also includes a slide rod 4 and a spring No. 1 5. The slide rod 4 is fixedly installed above the support frame 2. The slide rod 4 and the clamp 3 are slidably connected. The spring No. 1 5 is movably sleeved on the circumferential outer surface of the slide rod 4. The spring No. 1 5 and the clamp 3 are fixedly connected.

[0025] The rotating mechanism drives the support frame 2 and the clamp 3 to rotate. When the clamp 3 rotates, the adjusting block 6 contacts the fixed block 31, and the fixed block 31 pushes the adjusting block 6 toward the clamp 3. Under the action of the connecting plate 7, the two groups of clamps 3 can move away from each other on the outer surface of the slide rod 4. At this time, the No. 1 spring 5 is deformed by the force. When the adjusting block 6 is not in contact with the fixed block 31, under the elastic force of the No. 1 spring 5, the No. 1 spring 5 pushes the two groups of clamps 3 closer to each other.

[0026] It should be noted that the inclination angle of one group of fixing blocks 31 is the same as that of the conveying frame 14 , and the other group of fixing blocks 31 is arranged vertically. Both groups of fixing blocks 31 are located on the side of the support frame 2 close to the conveying frame 14 .

[0027] Specifically, the rotating mechanism includes a rotating shaft 8, a shaft 9 and a rotating motor 13. The rotating shaft 8 is fixedly inserted into the interior of the support frame 2. The shaft 9 is rotatably connected to the rotating shaft 8 through an elastic structure. The shaft 9 is rotatably connected to the processing frame 1. One group of shafts 9 is fixedly connected to the output end of the rotating motor 13 away from the rotating shaft 8. The rotating motor 13 is fixedly connected to the processing frame 1.

[0028] The elastic structure includes a groove 10, a push block 11 and an airbag 12. The groove 10 is opened at one end of the rotating shaft 8 close to the shaft 9. The push block 11 is fixedly installed on the outside of the side of the shaft 9 close to the rotating shaft 8. The push block 11 is slidably connected to the groove 10 through the airbag 12.

[0029] Connect the rotating motor 13 to an external power source, and the output end of the rotating motor 13 drives the shaft 9 to rotate. When the shaft 9 rotates toward the conveying rack 14, the adjusting block 6 contacts the fixed block 31, so that the support frame 2 and the clamp 3 cannot continue to rotate. At this time, the shaft 9 drives the push block 11 to slide inside the groove 10, and the airbag 12 is compressed. When the shaft 9 drives the clamp 3 to rotate away from the conveying rack 14, the airbag 12 gradually expands, and the push block 11 slides inside the groove 10. When the push block 11 cannot slide inside the groove 10, the shaft 9 drives the rotating shaft 8 to rotate synchronously through the push block 11.

[0030] Furthermore, the adjustment mechanism includes a guide groove 16, an adjustment plate 17, a connecting column 18, a sleeve 19 and a No. 2 spring 20. The guide groove 16 is opened on the upper surface of the conveying frame 14. The sleeve 19 penetrates the conveying frame 14 through the movable component. The connecting column 18 is slidably inserted into the interior of the sleeve 19 through the No. 2 spring 20. The adjustment plate 17 is fixedly installed on the outside of the connecting column 18 close to the guide plate 15. The upper end surface of the adjustment plate 17 close to the guide plate 15 is inclined.

[0031] The moving assembly includes a support block 21 and an electric push rod 22. The support block 21 is rotatably installed below the sleeve 19. The support block 21 is slidingly connected to the conveyor frame 14. The electric push rod 22 is fixedly installed below the conveyor frame 14. The electric push rod 22 is located between the support block 21 and the guide plate 15. The output end of the electric push rod 22 is fixedly connected to the support block 21.

[0032] A gear 23 is fixedly mounted on the outer surface of the sleeve 19 , and a rack 24 is fixedly mounted on the lower side of the conveying frame 14 , and the gear 23 and the rack 24 are meshed with each other.

[0033] The aluminum shell moves toward the clamp 3 inside the guide groove 16. The aluminum shell has two states. The unopened part of the aluminum shell contacts the adjustment plate 17. Since the upper end of the adjustment plate 17 close to the aluminum shell is inclined, the aluminum shell can push the adjustment plate 17 and the connecting column 18 to move downward inside the sleeve 19. At this time, the No. 2 spring 20 is deformed by the force, and the aluminum shell can continue to slide along the guide groove 16 to between the two sets of clamps 3.

[0034] The opening part of the aluminum shell contacts the adjustment plate 17, and the adjustment plate 17 is inserted into the interior of the aluminum shell. The electric push rod 22 drives the sleeve 19 to move toward the direction of the clamp 3 through the support block 21. Since the gear 23 and the rack 24 are engaged, the sleeve 19 can rotate one hundred and eighty degrees during the movement, thereby driving the aluminum shell to rotate one hundred and eighty degrees, so that the aluminum shell can be opened upward and inserted between the two sets of clamps 3.

[0035] Limiting plates 27 are provided on both sides of the adjustment plate 17 . The limiting plates 27 are connected to the adjustment plate 17 via a movable structure. A rubber member 28 is fixedly mounted on one side of the limiting plate 27 away from the adjustment plate 17 .

[0036] The movable structure includes a mounting plate 25, which is slidingly connected to the adjusting plate 17. A cross bar 29 is fixedly installed inside the mounting plate 25, and a No. 3 spring 30 is provided on the outer movable sleeve of the cross bar 29. The limiting plate 27 is slidingly connected to the cross bar 29 through the No. 3 spring 30. A push plate 26 is rotatably installed on the side of the limiting plate 27 close to the connecting column 18, and the end of the push plate 26 away from the limiting plate 27 is rotatably connected to the adjusting plate 17.

[0037] When the adjustment plate 17 is inserted into the aluminum shell, the aluminum shell contacts the mounting plate 25 and drives the mounting plate 25 to move synchronously. Under the action of the push plate 26, the push plate 26 drives the limit plate 27 to move on the outer surface of the cross bar 29 in the direction away from the adjustment plate 17, so that the limit plate 27 can limit the aluminum shell from the inside, so that the aluminum shell will not separate from the limit plate 27 when rotating, and the rubber part 28 can increase the friction between the limit plate 27 and the aluminum shell.

[0038] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0039] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A clamping and assembling device for processing supercapacitor aluminum shells, comprising a processing frame (1) and a conveying frame (14), characterized in that: A support frame (2) is provided inside the processing frame (1), and the support frame (2) is rotatably connected to the processing frame (1) through a rotating mechanism. Two groups of clamps (3) are slidably installed above the support frame (2), and a driving mechanism is provided between the two groups of clamps (3) to drive the two groups of clamps (3) to move closer to or away from each other. The conveying frame (14) is fixedly installed on one side of the processing frame (1), and the conveying frame (14) is inclined. Two groups of guide plates (15) are fixedly installed above the conveying frame (14), and the two groups of guide plates (15) are combined in a Y-shaped design. An adjustment mechanism that can drive the aluminum shell to rotate is provided above the conveying frame (14), and the adjustment mechanism is located between the guide plates (15) and the processing frame (1).

2. The clamping and assembling device for processing supercapacitor aluminum shells according to claim 1, characterized in that: The driving mechanism comprises an adjusting block (6), a connecting plate (7) and a fixed block (31), wherein the adjusting block (6) is provided in two groups, and the two groups of adjusting blocks (6) are respectively arranged on both sides of the support frame (2), and the connecting plates (7) are rotatably mounted on both sides of the adjusting block (6), and the ends of the two groups of connecting plates (7) away from the adjusting block (6) are rotatably connected to the two groups of clamps (3), respectively. The fixed blocks (31) are provided in two groups, and the two groups of fixed blocks (31) are fixedly connected to the processing frame (1), wherein one group of the fixed blocks (31) is arranged in a vertical shape, and the other group of the fixed blocks (31) is inclined, and the fixed blocks (31) and the adjusting blocks (6) are in contact and fit.

3. The clamping and assembling device for processing supercapacitor aluminum shells according to claim 2, characterized in that: The driving mechanism further comprises a slide rod (4) and a No. 1 spring (5), wherein the slide rod (4) is fixedly mounted above the support frame (2), the slide rod (4) and the clamp (3) are slidably connected, the No. 1 spring (5) is movably sleeved on the circumferential outer surface of the slide rod (4), and the No. 1 spring (5) and the clamp (3) are fixedly connected.

4. The clamping and assembling device for processing supercapacitor aluminum shells according to claim 1, characterized in that: The rotating mechanism includes a rotating shaft (8), a shaft member (9) and a rotating motor (13), wherein the rotating shaft (8) is fixedly inserted into the interior of the support frame (2), the shaft member (9) is rotationally connected to the rotating shaft (8) through an elastic structure, the shaft member (9) and the processing frame (1) are rotationally connected, and one end of a group of the shaft members (9) away from the rotating shaft (8) is fixedly connected to the output end of the rotating motor (13), and the rotating motor (13) and the processing frame (1) are fixedly connected.

5. The clamping and assembling device for processing supercapacitor aluminum shells according to claim 4, characterized in that: The elastic structure comprises a groove (10), a push block (11) and an air bag (12); the groove (10) is formed at one end of the rotating shaft (8) close to the shaft member (9); the push block (11) is fixedly mounted on the outside of one side of the shaft member (9) close to the rotating shaft (8); and the push block (11) is slidably connected to the groove (10) via the air bag (12).

6. The clamping and assembling device for processing supercapacitor aluminum shells according to claim 1, characterized in that: The adjustment mechanism includes a guide groove (16), an adjustment plate (17), a connecting column (18), a sleeve (19) and a No. 2 spring (20), wherein the guide groove (16) is provided on the upper surface of the conveying frame (14), the sleeve (19) penetrates the conveying frame (14) through the movable assembly, the connecting column (18) is slidably inserted into the interior of the sleeve (19) through the No. 2 spring (20), the adjustment plate (17) is fixedly mounted on the outside of the connecting column (18) on a side close to the guide plate (15), and the upper end surface of the adjusting plate (17) on a side close to the guide plate (15) is inclined.

7. The clamping and assembling device for processing supercapacitor aluminum shells according to claim 6, characterized in that: The moving assembly includes a support block (21) and an electric push rod (22), wherein the support block (21) is rotatably mounted below the sleeve (19), the support block (21) and the conveying frame (14) are slidably connected, the electric push rod (22) is fixedly mounted below the conveying frame (14), the electric push rod (22) is located between the support block (21) and the guide plate (15), and the output end of the electric push rod (22) is fixedly connected to the support block (21).

8. The clamping and assembling device for processing supercapacitor aluminum shells according to claim 6, characterized in that: A gear (23) is fixedly mounted on the outer surface of the sleeve (19), and a rack (24) is fixedly mounted on one side below the conveying frame (14), wherein the gear (23) and the rack (24) are meshed with each other.

9. The clamping and assembling device for processing supercapacitor aluminum shells according to claim 6, characterized in that: Limiting plates (27) are provided on both sides of the adjustment plate (17), the limiting plates (27) are connected to the adjustment plate (17) via a movable structure, and a rubber part (28) is fixedly mounted on one side of the limiting plate (27) away from the adjustment plate (17).

10. The clamping and assembling device for processing supercapacitor aluminum shells according to claim 9, characterized in that: The movable structure includes a mounting plate (25), the mounting plate (25) and the adjustment plate (17) are slidably connected, a cross bar (29) is fixedly installed inside the mounting plate (25), and a No. 3 spring (30) is provided on the outer movable sleeve of the cross bar (29), the limit plate (27) is slidably connected to the cross bar (29) through the No. 3 spring (30), and a push plate (26) is rotatably installed on the side of the limit plate (27) close to the connecting column (18), and the push plate (26) is rotatably connected to the adjustment plate (17) at one end away from the limit plate (27).