A polar ring assembly device

By designing an electrode ring assembly device, the device utilizes limiting holes and limiting posts to achieve forward and reverse screening of the electrode ring membrane and rapid assembly of the cavity ring, solving the problem that the electrode ring membrane screening tooling cannot distinguish between forward and reverse sides, and improving assembly efficiency.

CN224290007UActive Publication Date: 2026-05-26SHANDONG GETTOP ACOUSTIC CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHANDONG GETTOP ACOUSTIC CO LTD
Filing Date
2025-08-11
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

The existing electrode ring membrane screening tooling cannot distinguish between the front and back, resulting in the electrode ring membrane having both front and back sides. After fastening, it needs to be flipped over, which is inefficient, time-consuming and labor-intensive.

Method used

Design an electrode ring assembly device, including a cavity ring assembly plate, a cavity ring pressure plate, an electrode ring membrane screening plate and a pressure plate. The device enables forward and reverse screening of the electrode ring membrane through limiting holes and limiting posts, and enables rapid assembly of the cavity ring and the electrode ring through staggered placement grooves and through holes.

Benefits of technology

This method enables unidirectional screening of polar ring membranes, avoids the flipping process after snapping, improves assembly efficiency, and reduces wasted time.

✦ Generated by Eureka AI based on patent content.

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Abstract

This utility model relates to an electrode ring assembly device, belonging to the technical field of assembly devices. It includes a cavity ring assembly plate, a cavity ring pressure plate, an electrode ring membrane screening plate, and a pressure plate. The cavity ring assembly plate, cavity ring pressure plate, electrode ring membrane screening plate, and pressure plate are all the same size. The electrode ring membrane screening plate is evenly provided with several rows of electrode ring placement slots. A first circular boss is provided at the center of the electrode ring placement slot. This utility model has a simple structure and is easy to operate. It can screen the electrode ring membrane in the same direction and realize the rapid assembly of the cavity ring and the electrode ring, avoiding the need for a flipping process after fastening, reducing time waste, and improving efficiency.
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Description

Technical Field

[0001] This utility model relates to the field of assembly device technology, and in particular to an polar ring assembly device. Background Technology

[0002] The front-electrode ECM microphone has two internal components: an electrode ring and a cavity ring. The electrode ring is located inside the cavity ring and is in contact with it. One end of the electrode ring has an electrode diaphragm. During assembly, the electrode ring needs to be placed into the cavity ring and fastened. The orientation of the electrode diaphragm must be consistent. However, the current electrode diaphragm screening tool cannot distinguish between the front and back. After screening, the electrode diaphragm surface is sometimes front and sometimes back. After fastening, an additional flipping action is required to ensure that the electrode diaphragm surface is consistent. After fastening, 50% of the electrodes need to be flipped before they can be used in the next process. The flipping efficiency is low, and it is time-consuming and labor-intensive. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the above-mentioned traditional technologies and provide an electrode ring assembly device that can realize the rapid assembly of the cavity ring and the electrode ring, avoid the need for a flipping process after fastening, reduce time waste, and improve efficiency.

[0004] The purpose of this utility model is achieved through the following technical measures: an electrode ring assembly device, including a cavity ring assembly plate, a cavity ring pressure plate, an electrode ring membrane sieve plate and a pressure plate. The cavity ring assembly plate, the cavity ring pressure plate, the electrode ring membrane sieve plate and the pressure plate are of equal size. The electrode ring membrane sieve plate is evenly provided with several rows of electrode ring placement grooves. A first circular boss is provided at the center of the electrode ring placement groove.

[0005] As a further improvement to the above technical solution:

[0006] The height of the first circular boss is less than the depth of the electrode ring placement groove. The four corners of the electrode ring membrane screen plate are respectively provided with second limiting holes, which correspond to the limiting posts. The upper and lower ends of the electrode ring membrane screen plate are respectively provided with second grooves.

[0007] The cavity ring assembly plate is evenly provided with several rows of cavity ring placement slots, which are staggered. A first through hole is provided below the center of the cavity ring placement slot, and the first through hole extends out of the cavity ring assembly plate.

[0008] The diameter of the cavity ring placement groove is equal to the outer diameter of the cavity ring, and the depth of the cavity ring placement groove is equal to the height of the cavity ring.

[0009] The cavity ring assembly plate is provided with limiting posts at its four corners, and with first grooves at its upper and lower ends.

[0010] The cavity ring pressure plate is uniformly provided with several rows of second through holes, and the arrangement of the several rows of second through holes is the same as that of several rows of cavity ring placement slots. The diameter of the second through hole is equal to the inner diameter of the cavity ring.

[0011] The cavity ring pressure plate is provided with a first limiting hole at each of its four corners, and the first limiting hole corresponds to the limiting post.

[0012] The pressure plate is uniformly provided with several rows of second circular protrusions, and the arrangement of the several rows of second circular protrusions is the same as that of several rows of cavity ring placement grooves. The diameter of the second circular protrusion is equal to the diameter of the polar ring film.

[0013] The pressure plate is provided with a third limiting hole at each of its four corners, and the third limiting hole corresponds to the limiting post. The upper and lower ends of the pressure plate are provided with a third groove.

[0014] The first, second, and third grooves have the same structure, and the length of each groove is 20-40mm and the depth is 3-8mm.

[0015] Due to the adoption of the above technical solution, compared with the prior art, the advantages of this utility model are: the utility model has a simple structure and is easy to operate. It can screen the polar ring membrane in the same direction and realize the rapid assembly of the cavity ring and the polar ring, avoiding the need to add a flipping process after fastening, reducing time waste and improving efficiency.

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of an electrode ring assembly device according to an embodiment of this utility model;

[0018] Figure 2 This is a schematic diagram of the cavity ring assembly plate in an embodiment of this utility model;

[0019] Figure 3 yes Figure 2 Sectional view along the middle AA direction;

[0020] Figure 4 yes Figure 3 Enlarged view of part B in the middle;

[0021] Figure 5 This is a schematic diagram of the cavity ring pressure plate in an embodiment of this utility model;

[0022] Figure 6 yes Figure 5 Rear view;

[0023] Figure 7 This is a schematic diagram of the structure of the polar ring membrane screen plate in an embodiment of this utility model;

[0024] Figure 8 yes Figure 7 A cross-sectional view along the CC direction;

[0025] Figure 9 yes Figure 8 Enlarged view of a section in part D;

[0026] Figure 10 This is a schematic diagram of the pressure plate in an embodiment of this utility model.

[0027] In the figure, 1-cavity ring assembly plate, 2-cavity ring pressure plate, 3-polar ring membrane screen plate, 4-pressure plate, 5-cavity ring placement groove, 6-first through hole, 7-limiting post, 8-second through hole, 9-first chamfer, 10-first limiting hole, 11-second chamfer, 12-third chamfer, 13-first groove, 14-polar ring placement groove, 15-first circular boss, 16-fourth chamfer, 17-second groove, 18-second limiting hole, 19-third limiting hole, 20-third groove, 21-second circular boss. Detailed Implementation

[0028] 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.

[0029] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Example 1

[0031] like Figure 1-10As shown, an electrode ring assembly device includes a cavity ring assembly plate 1, a cavity ring pressure plate 2, an electrode ring membrane screening plate 3, and a pressure plate 4. The cavity ring assembly plate 1, the cavity ring pressure plate 2, the electrode ring membrane screening plate 3, and the pressure plate 4 are all rectangular and of equal size. The cavity ring assembly plate 1 is used to place the cavity ring, the electrode ring membrane screening plate 3 is used to place and screen the front and back of the electrode ring membrane, the cavity ring pressure plate 2 is used for auxiliary assembly of the electrode ring and the cavity ring, and the pressure plate 4 is used to press the assembled electrode ring and the cavity ring together.

[0032] The cavity ring assembly plate 1 is evenly provided with several rows of cavity ring placement slots 5, which are staggered. A first through hole 6 is provided below the center of the cavity ring placement slot 5, and the first through hole 6 extends out of the cavity ring assembly plate 1. The diameter of the cavity ring placement slot 5 is equal to the outer diameter of the cavity ring, and the depth of the cavity ring placement slot 5 is equal to the height of the cavity ring. The cavity ring is placed in the cavity ring placement slot 5. The upper end of the cavity ring placement slot 5 is provided with a first chamfer 9, and the upper end of the first through hole 6 is provided with a second chamfer 11.

[0033] The cavity ring assembly plate 1 has four corner limit posts 7, and the upper and lower ends of the cavity ring assembly plate 1 have first grooves 13.

[0034] The cavity ring pressure plate 2 is uniformly provided with several rows of second through holes 8. The arrangement of the several rows of second through holes 8 is the same as that of several rows of cavity ring placement grooves 5. The diameter of the second through hole 8 is equal to the inner diameter of the cavity ring, and the inner diameter of the cavity ring is equal to the outer diameter of the pole ring. One end of the second through hole 8 is provided with a third chamfer 12. The four corners of the cavity ring pressure plate 2 are respectively provided with first limiting holes 10, and the first limiting holes 10 correspond to the limiting posts 7.

[0035] The electrode ring membrane screen plate 3 is uniformly provided with several rows of electrode ring placement grooves 14. The arrangement of the several rows of electrode ring placement grooves 14 is the same as that of several rows of cavity ring placement grooves 5. A first circular boss 15 is provided at the center of the electrode ring placement groove 14. The height of the first circular boss 15 is less than the depth of the electrode ring placement groove 14. The difference between the height of the first circular boss 15 and the depth of the electrode ring placement groove 14 is the thickness of the electrode ring membrane.

[0036] The upper end of the electrode ring placement groove 14 is provided with a fourth chamfer 16, and the four corners of the electrode ring membrane screen plate 3 are respectively provided with second limiting holes 18, which correspond to the limiting posts 7. The upper and lower ends of the electrode ring membrane screen plate 3 are respectively provided with second grooves 17.

[0037] The pressure plate 4 is evenly provided with several rows of second circular protrusions 21. The arrangement of the several rows of second circular protrusions 21 is the same as that of several rows of cavity ring placement grooves 5. The diameter of the second circular protrusion 21 is equal to the diameter of the polar ring membrane. The four corners of the pressure plate 4 are respectively provided with third limiting holes 19, which correspond to the limiting posts 7. The upper and lower ends of the pressure plate 4 are respectively provided with third grooves 20.

[0038] The first groove 13, the second groove 17, and the third groove 20 have the same structure and are designed to make it easier to pick up or press the board. The length of the first groove 13, the second groove 17, and the third groove 20 is 20mm and the depth is 3mm. Example 2

[0039] like Figure 1-10 As shown, an electrode ring assembly device includes a cavity ring assembly plate 1, a cavity ring pressure plate 2, an electrode ring membrane screening plate 3, and a pressure plate 4. The cavity ring assembly plate 1, the cavity ring pressure plate 2, the electrode ring membrane screening plate 3, and the pressure plate 4 are all rectangular and of equal size. The cavity ring assembly plate 1 is used to place the cavity ring, the electrode ring membrane screening plate 3 is used to place and screen the front and back of the electrode ring membrane, the cavity ring pressure plate 2 is used for auxiliary assembly of the electrode ring and the cavity ring, and the pressure plate 4 is used to press the assembled electrode ring and the cavity ring together.

[0040] The cavity ring assembly plate 1 is evenly provided with several rows of cavity ring placement slots 5, which are staggered. A first through hole 6 is provided below the center of the cavity ring placement slot 5, and the first through hole 6 extends out of the cavity ring assembly plate 1. The diameter of the cavity ring placement slot 5 is equal to the outer diameter of the cavity ring, and the depth of the cavity ring placement slot 5 is equal to the height of the cavity ring. The cavity ring is placed in the cavity ring placement slot 5. The upper end of the cavity ring placement slot 5 is provided with a first chamfer 9, and the upper end of the first through hole 6 is provided with a second chamfer 11.

[0041] The cavity ring assembly plate 1 has four corner limit posts 7, and the upper and lower ends of the cavity ring assembly plate 1 have first grooves 13.

[0042] The cavity ring pressure plate 2 is uniformly provided with several rows of second through holes 8. The arrangement of the several rows of second through holes 8 is the same as that of several rows of cavity ring placement grooves 5. The diameter of the second through hole 8 is equal to the inner diameter of the cavity ring, and the inner diameter of the cavity ring is equal to the outer diameter of the pole ring. One end of the second through hole 8 is provided with a third chamfer 12. The four corners of the cavity ring pressure plate 2 are respectively provided with first limiting holes 10, and the first limiting holes 10 correspond to the limiting posts 7.

[0043] The electrode ring membrane screen plate 3 is uniformly provided with several rows of electrode ring placement grooves 14. The arrangement of the several rows of electrode ring placement grooves 14 is the same as that of several rows of cavity ring placement grooves 5. A first circular boss 15 is provided at the center of the electrode ring placement groove 14. The height of the first circular boss 15 is less than the depth of the electrode ring placement groove 14. The difference between the height of the first circular boss 15 and the depth of the electrode ring placement groove 14 is the thickness of the electrode ring membrane.

[0044] The upper end of the electrode ring placement groove 14 is provided with a fourth chamfer 16, and the four corners of the electrode ring membrane screen plate 3 are respectively provided with second limiting holes 18, which correspond to the limiting posts 7. The upper and lower ends of the electrode ring membrane screen plate 3 are respectively provided with second grooves 17.

[0045] The pressure plate 4 is evenly provided with several rows of second circular protrusions 21. The arrangement of the several rows of second circular protrusions 21 is the same as that of several rows of cavity ring placement grooves 5. The diameter of the second circular protrusion 21 is equal to the diameter of the polar ring membrane. The four corners of the pressure plate 4 are respectively provided with third limiting holes 19, which correspond to the limiting posts 7. The upper and lower ends of the pressure plate 4 are respectively provided with third grooves 20.

[0046] The first groove 13, the second groove 17, and the third groove 20 have the same structure and are designed to make it easier to pick up or press the board. The length of the first groove 13, the second groove 17, and the third groove 20 is 40mm and the depth is 8mm. Example 3

[0047] like Figure 1-10 As shown, an electrode ring assembly device includes a cavity ring assembly plate 1, a cavity ring pressure plate 2, an electrode ring membrane screening plate 3, and a pressure plate 4. The cavity ring assembly plate 1, the cavity ring pressure plate 2, the electrode ring membrane screening plate 3, and the pressure plate 4 are all rectangular and of equal size. The cavity ring assembly plate 1 is used to place the cavity ring, the electrode ring membrane screening plate 3 is used to place and screen the front and back of the electrode ring membrane, the cavity ring pressure plate 2 is used for auxiliary assembly of the electrode ring and the cavity ring, and the pressure plate 4 is used to press the assembled electrode ring and the cavity ring together.

[0048] The cavity ring assembly plate 1 is evenly provided with several rows of cavity ring placement slots 5, which are staggered. A first through hole 6 is provided below the center of the cavity ring placement slot 5, and the first through hole 6 extends out of the cavity ring assembly plate 1. The diameter of the cavity ring placement slot 5 is equal to the outer diameter of the cavity ring, and the depth of the cavity ring placement slot 5 is equal to the height of the cavity ring. The cavity ring is placed in the cavity ring placement slot 5. The upper end of the cavity ring placement slot 5 is provided with a first chamfer 9, and the upper end of the first through hole 6 is provided with a second chamfer 11.

[0049] The cavity ring assembly plate 1 has four corner limit posts 7, and the upper and lower ends of the cavity ring assembly plate 1 have first grooves 13.

[0050] The cavity ring pressure plate 2 is uniformly provided with several rows of second through holes 8. The arrangement of the several rows of second through holes 8 is the same as that of several rows of cavity ring placement grooves 5. The diameter of the second through hole 8 is equal to the inner diameter of the cavity ring, and the inner diameter of the cavity ring is equal to the outer diameter of the pole ring. One end of the second through hole 8 is provided with a third chamfer 12. The four corners of the cavity ring pressure plate 2 are respectively provided with first limiting holes 10, and the first limiting holes 10 correspond to the limiting posts 7.

[0051] The electrode ring membrane screen plate 3 is uniformly provided with several rows of electrode ring placement grooves 14. The arrangement of the several rows of electrode ring placement grooves 14 is the same as that of several rows of cavity ring placement grooves 5. A first circular boss 15 is provided at the center of the electrode ring placement groove 14. The height of the first circular boss 15 is less than the depth of the electrode ring placement groove 14. The difference between the height of the first circular boss 15 and the depth of the electrode ring placement groove 14 is the thickness of the electrode ring membrane.

[0052] The upper end of the electrode ring placement groove 14 is provided with a fourth chamfer 16, and the four corners of the electrode ring membrane screen plate 3 are respectively provided with second limiting holes 18, which correspond to the limiting posts 7. The upper and lower ends of the electrode ring membrane screen plate 3 are respectively provided with second grooves 17.

[0053] The pressure plate 4 is evenly provided with several rows of second circular protrusions 21. The arrangement of the several rows of second circular protrusions 21 is the same as that of several rows of cavity ring placement grooves 5. The diameter of the second circular protrusion 21 is equal to the diameter of the polar ring membrane. The four corners of the pressure plate 4 are respectively provided with third limiting holes 19, which correspond to the limiting posts 7. The upper and lower ends of the pressure plate 4 are respectively provided with third grooves 20.

[0054] The first groove 13, the second groove 17, and the third groove 20 have the same structure and are designed to make it easier to pick up or press the board. The length of the first groove 13, the second groove 17, and the third groove 20 is 30mm and the depth is 6mm.

[0055] During assembly, first place the cavity rings into the several rows of cavity ring placement slots 5 on the cavity ring assembly plate 1, and then place the electrode rings into the several rows of electrode ring placement slots 14 on the electrode ring membrane screen plate 3. Since the center of the electrode ring placement slot 14 is provided with a first circular boss 15, all the electrode ring membranes are located on the first circular boss 15, and the electrode ring membranes in the opposite direction cannot be placed into the electrode ring placement slots 14. Then, place the cavity ring pressing plate 2 on the cavity ring assembly plate 1, and use the limiting post 7 on the cavity ring assembly plate 1 and the cavity ring pressing plate 2 to press the electrode ring pressing plate 2 into the cavity ring assembly plate 1. The first limiting hole 10 on the body ring pressure plate 2 is used for positioning. At this time, the several rows of cavity ring placement slots 5 on the cavity ring assembly plate 1 correspond one-to-one with the several rows of second through holes 8 on the cavity ring pressure plate 2. Then, the cavity ring pressure plate 2 and the cavity ring assembly plate 1 are flipped over, and the cavity ring assembly plate 1 is located above the cavity ring pressure plate 2. Since the diameter of the second through hole 8 is equal to the inner diameter of the cavity ring, the cavity ring will not fall off. Then, the cavity ring pressure plate 2 and the cavity ring assembly plate 1 are placed together on the polar ring membrane screen plate 3. The electrode rings are positioned by the limiting posts 7 on the cavity ring assembly plate 1 and the second limiting holes 18 on the electrode ring membrane screen plate 3. Several rows of electrode ring placement grooves 14 on the electrode ring membrane screen plate 3 correspond one-to-one with several rows of second through holes 8 on the cavity ring pressure plate 2. Then, the electrode ring membrane screen plate 3, cavity ring pressure plate 2, and cavity ring assembly plate 1 are flipped again, with the electrode ring membrane screen plate 3 at the top and the cavity ring assembly plate 1 at the bottom. The electrode ring membrane on the electrode ring membrane screen plate 3 enters through its corresponding second through hole 8. The corresponding cavity rings on the cavity ring assembly plate 1 are placed inside the cavity rings. Then, the electrode ring membrane screen plate 3 is removed, and the pressure plate 4 is placed on the cavity ring assembly plate 1. The positioning is achieved by the limiting post 7 on the cavity ring assembly plate 1 and the third limiting hole 19 on the pressure plate 4. Several rows of cavity ring placement grooves 5 on the cavity ring assembly plate 1 correspond one-to-one with several rows of second circular bosses 21 on the pressure plate 4. Several rows of second circular bosses 21 on the pressure plate 4 press and fasten the assembled cavity rings and electrode rings, thus completing the assembly.

[0056] This invention has a simple structure and is easy to operate. It can screen the polar ring membranes in the same direction and can quickly assemble the cavity ring and the polar ring, avoiding the need for a flipping process after fastening, reducing time waste and improving efficiency.

[0057] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements 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 polar ring assembly device, characterized in that: It includes a cavity ring assembly plate (1), a cavity ring pressure plate (2), an polar ring membrane screen plate (3) and a pressure plate (4). The cavity ring assembly plate (1), the cavity ring pressure plate (2), the polar ring membrane screen plate (3) and the pressure plate (4) are of equal size. The polar ring membrane screen plate (3) is evenly provided with several rows of polar ring placement grooves (14). The center of the polar ring placement groove (14) is provided with a first circular boss (15).

2. The polar ring assembly device according to claim 1, characterized in that: The height of the first circular boss (15) is less than the depth of the polar ring placement groove (14). The four corners of the polar ring membrane screen plate (3) are respectively provided with second limiting holes (18). The second limiting holes (18) correspond to the limiting posts (7). The upper and lower ends of the polar ring membrane screen plate (3) are respectively provided with second grooves (17).

3. A polar ring assembly device according to claim 1 or 2, characterized in that: The cavity ring assembly plate (1) is evenly provided with several rows of cavity ring placement slots (5), and the several rows of cavity ring placement slots (5) are staggered. A first through hole (6) is provided below the center of the cavity ring placement slot (5), and the first through hole (6) passes through the cavity ring assembly plate (1).

4. The polar ring assembly device according to claim 3, characterized in that: The diameter of the cavity ring placement groove (5) is equal to the outer diameter of the cavity ring, and the depth of the cavity ring placement groove (5) is equal to the height of the cavity ring.

5. The polar ring assembly device according to claim 4, characterized in that: The cavity ring assembly plate (1) is provided with limiting posts (7) at its four corners, and the cavity ring assembly plate (1) is provided with first grooves (13) at its upper and lower ends.

6. The polar ring assembly device according to claim 5, characterized in that: The cavity ring pressure plate (2) is uniformly provided with several rows of second through holes (8). The arrangement of the several rows of second through holes (8) is the same as that of several rows of cavity ring placement grooves (5). The diameter of the second through hole (8) is equal to the inner diameter of the cavity ring.

7. The polar ring assembly device according to claim 6, characterized in that: The four corners of the cavity ring pressure plate (2) are respectively provided with first limiting holes (10), and the first limiting holes (10) correspond to the limiting posts (7).

8. The polar ring assembly device according to claim 7, characterized in that: The pressure plate (4) is uniformly provided with several rows of second circular protrusions (21). The arrangement of the several rows of second circular protrusions (21) is the same as that of several rows of cavity ring placement grooves (5). The diameter of the second circular protrusions (21) is equal to the diameter of the polar ring film.

9. The polar ring assembly device according to claim 8, characterized in that: The pressure plate (4) has a third limiting hole (19) at each of its four corners, which corresponds to the limiting post (7). The pressure plate (4) has a third groove (20) at its upper and lower ends.

10. The polar ring assembly device according to claim 9, characterized in that: The first groove (13), the second groove (17), and the third groove (20) have the same structure. The length of the first groove (13), the second groove (17), and the third groove (20) is 20-40mm, and the depth is 3-8mm.