Air bag type pressurization bonding device

Abstract

The utility model relates to the technical field of pressure bonding, in particular to an air bag type pressure bonding device. The device can be used for carrying out one-time bonding and pressing on a cambered-surface-shaped shell and a cambered-surface-shaped foaming layer. Comprising a circular base, a plurality of supports are arranged on the top face of the circular base, a circle is defined by the supports, and the heights of the supports are sequentially decreased from one circle of the periphery of the defined circle to the circle center; the top faces of the multiple supports are provided with bearing discs with openings facing upwards and concaving inwards. A circular-ring-shaped cover plate mounting seat is arranged on the top surface of the bearing disc; a cover plate is arranged on the cover plate mounting seat; an air bag is arranged on the bottom surface of the cover plate; a closed bonding cavity is formed between the air bag and the bearing disc. The air bag type pressurizing bonding device has the advantages of repeated use, long service life, independent replacement of the damaged air bag, simplicity in replacement and the like, the production cost can be effectively saved, and the economic benefit is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure bonding, in particular to an airbag type pressure bonding device. Background Art

[0002] Currently, bonding two layers of product together is typically done by applying glue and then rolling and compacting it with a roller. This only applies to products with flat surfaces. Bonding uneven surfaces requires more manual effort, requiring manual compaction.

[0003] This application focuses on bonding and compacting uneven surfaces, particularly hemispherical shells. To meet the complex operating environments of underwater equipment and the need for shell protection during operation, a foam layer is bonded to the shell to prevent unforeseen collisions between the internal equipment and the shell. The airbag's expansion and flexibility enable uniform pressure application to the bonded object, achieving optimal bonding results for irregular surfaces, such as the curved surface in this application. Utility Model Content

[0004] The technical problem to be solved by the utility model is to address the deficiencies in the prior art and to provide an airbag type pressurized bonding device which can perform one-time bonding and pressing of a shell and a foaming layer in an arc shape.

[0005] In order to solve the above technical problems, the technical solution adopted by the present utility model is:

[0006] An airbag type pressure bonding device comprises a circular base, a top surface of which is provided with a plurality of brackets, the brackets being arranged to form a circle, and the heights of the brackets decreasing from the outer circumference of the circle to the center of the circle;

[0007] The top surfaces of several of the brackets are provided with a carrying plate with an opening facing upward and concave;

[0008] The top surface of the carrier plate is provided with a circular cover mounting seat;

[0009] The cover plate mounting seat is provided with a cover plate;

[0010] An air bag is provided on the bottom surface of the cover plate;

[0011] A closed bonding cavity is formed between the airbag and the carrying plate.

[0012] Furthermore, the bonding cavity is used to place the shell and foam layer to be bonded;

[0013] The shell is placed on the carrier plate, the foam layer is placed on the shell, and the shell and the foam layer are concentric;

[0014] The diameter of the foaming layer is smaller than the diameter of the shell.

[0015] Furthermore, the cover plate mounting seat is fixedly mounted on the carrying plate;

[0016] Cover plate bolts are evenly distributed in the circumferential direction of the top surface of the cover plate mounting seat;

[0017] The cover plate is uniformly distributed in the circumferential direction with cover plate bolt holes corresponding in number and position to the cover plate bolts.

[0018] The cover plate bolts pass through the cover plate bolt holes and are installed on the cover plate mounting seat via nuts.

[0019] Furthermore, screw holes are evenly distributed in the circumferential direction of the bottom surface of the cover plate;

[0020] The airbag is evenly distributed in the circumferential direction with screws corresponding in number and position to the screw holes;

[0021] The screws are fastened in the screw holes to mount the airbag on the cover plate.

[0022] Furthermore, the airbag includes an expansion limiting layer, an expansion layer is provided on the bottom surface of the expansion limiting layer, and an airbag cavity is formed between the expansion limiting layer and the expansion layer;

[0023] The expansion limiting layer is provided with an air nozzle communicating with the airbag cavity;

[0024] A fixing layer is formed at the junction of the expansion limiting layer and the expansion layer, and screws are pre-embedded in the fixing layer.

[0025] Furthermore, a gas nozzle hole is provided on the cover plate, and the gas nozzle passes through the gas nozzle hole.

[0026] Furthermore, a spacer is provided between the cover plate mounting seat and the cover plate;

[0027] The A surface of the pad is in contact with the bottom surface of the cover plate;

[0028] The B surface of the pad is in contact with the top surface of the cover plate mounting seat;

[0029] The C surface of the cushion block contacts and cooperates with the shell.

[0030] Furthermore, a limited area is formed between the foaming layer and the shell in the bonding cavity;

[0031] A limiting ring is provided in the limiting area;

[0032] The bottom surface of the cover plate is provided with a snap-fit block;

[0033] One side of the limiting ring contacts and cooperates with the foaming layer, and the other side contacts and cooperates with the locking block.

[0034] Furthermore, the carrying plate includes a left carrying plate and a right carrying plate;

[0035] An arc-shaped connecting block is provided at the center of a circle formed by a plurality of the brackets, and the arc-shaped connecting block is used to connect the left supporting plate and the right supporting plate;

[0036] The left and right side walls of the arc-shaped connecting block are symmetrically provided with engaging grooves, the left carrying plate is provided with a left engaging strip engaged with the engaging groove of the left side wall, and the right carrying plate is provided with a right engaging strip engaged with the engaging groove of the right side wall;

[0037] The top arc surfaces formed by the arc-shaped connecting block, the left supporting plate and the right supporting plate after being clamped together are consistent.

[0038] A method for using an airbag-type pressure bonding device comprises the following steps:

[0039] S1. Place the housing on the carrier plate and apply adhesive to the upward concave surface of the housing.

[0040] S2. Apply adhesive to the convex surface of the foam layer facing downward and place it on the concave surface of the shell;

[0041] S3. Place the limit ring in the limit area and place the pad on the cover mounting seat.

[0042] S4. Place the cover with the airbag on the cover mounting seat and secure it with nuts.

[0043] S5. Inflate the airbag cavity with compressed air through the air nozzle until the expansion layer is in full contact with the foaming layer. Continue to inflate and pressurize until the foaming layer is in full contact with the shell and pressurize. Maintain this pressure for 5 minutes.

[0044] S6, releasing the compressed air in the airbag cavity from the air nozzle to release the pressure in the airbag cavity;

[0045] S7. Open the cover plate and remove the shell and foam layer that are bonded together to obtain the finished product.

[0046] The advantages of the utility model are:

[0047] 1. The airbag pressure bonding device can effectively and tightly fit together irregular bonding surfaces. The irregular bonding surface here refers to the arc surface, which can greatly improve the quality of bonding and prevent bonding hollowing. The limiting ring can effectively prevent slippage when the two bonding objects are inconsistent in size, thereby improving the dimensional accuracy of the bonded objects. The airbag pressure bonding device can be reused many times and has a long service life. The airbag can be replaced separately if damaged. It is easy to install and can effectively save production costs and improve economic benefits.

[0048] 2. The locking block can compress the limit ring to further prevent the displacement of the limit ring and the slipping between the two bonded objects; no matter which part of the gasket, cover plate mounting seat, airbag, cover plate, limit ring, and carrier plate in the airbag pressure bonding device is damaged, only the damaged part needs to be replaced separately, which saves a lot of expenses for daily use and maintenance.

[0049] 3. The entire carrier plate is placed on the bracket. For greater convenience, the carrier plate can be divided into two parts, making two symmetrical left and right carrier plates, which are then inserted into the arc-shaped connecting block to form a complete carrier plate. Regardless of whether it is an integrated carrier plate or a symmetrical left and right carrier plate, the concave surfaces presented are all smooth, and the angles of the concave arc surfaces are consistent, which can ensure that they can be used in combination with the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 This is a schematic diagram of the unexpanded structure of the airbag of the utility model;

[0051] Figure 2 This is a schematic diagram of the structure of the utility model airbag after expansion, the foaming layer and the shell;

[0052] Figure 3 This is a schematic diagram of the assembly structure of the bracket, the bearing plate, and the cover plate mounting seat in the utility model;

[0053] Figure 4 This is a schematic diagram of the top view of the cover plate of the utility model;

[0054] Figure 5 This is a schematic diagram of the structure of the airbag of the utility model;

[0055] Figure 6 This is a schematic diagram of the structure of the limiting area in the utility model;

[0056] Figure 7 This is a schematic diagram of the exploded structure of the arc-shaped connecting block, the left bearing plate, and the right bearing plate in the utility model;

[0057] Figure 8 This utility model Figure 7 A schematic diagram of the side structure of the arc-shaped connecting block;

[0058] Figure 9 It is a schematic diagram of the structure of the carrier plate in the utility model. DETAILED DESCRIPTION

[0059] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. 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.

[0060] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0061] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0062] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0063] 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 the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0064] like Figure 1-9 As shown:

[0065] An airbag-type pressure bonding device comprises a circular base 7, the top surface of which is provided with a plurality of brackets 1. The brackets 1 are arranged in a circle, and the height of the brackets 1 decreases from the outer circumference of the circle to the center of the circle. The top surfaces of the brackets 1 are provided with a carrier plate 2 with an upwardly concave opening. The carrier plate 2 has an arcuate longitudinal cross-section, and the tops of the brackets 1 are cut with a slope that matches the arc surface at the corresponding position on the bottom surface of the carrier plate 2 for contact. The top surface of the carrier plate 2 is provided with a circular cover plate mounting seat 3.

[0066] A cover plate 4 is provided on the cover plate mounting seat 3 ; an air bag 5 is provided on the bottom surface of the cover plate 4 ; and a closed bonding cavity 6 is formed between the air bag 5 and the carrying plate 2 .

[0067] The bracket 1 is used to support the carrier plate 2. The top of the bracket 1 is made in the shape of the contact surface with the carrier plate 2 to facilitate support and pressure transmission. Figure 3 The bracket 1 is made of square tubes, steel plates and the like by processing and welding.

[0068] The cover plate 4 is locked on the cover plate mounting seat 3 by the nut 43 during use. The cover plate 4 can also be provided with reinforcing ribs to ensure the strength of the cover plate 4. Figure 1 、 4 The cover plate 4 is made of steel plates processed and welded.

[0069] When the airbag 5 is in operation, compressed air is injected into the air nozzle 55. Driven by the compressed air, the expansion layer 53 expands and adheres closely to the surface of the adhered object, exerting pressure on the surface of the adhered object to promote the adhesion of the adhered surfaces. The airbag 5 is manufactured as follows: the air nozzle 55 and the expansion limiting layer 52 are vulcanized into one piece. At the same time, a fixing layer 56 is vulcanized around the circumference of the junction between the expansion layer 53 and the expansion limiting layer 52. Screws 51 are then embedded in the fixing layer 56 to facilitate connection with the cover plate 4. The expansion limiting layer 52 is made of a rubber and fabric composite vulcanized into one piece. The expansion layer 53 is made of pure rubber and vulcanized into one piece with the expansion limiting layer 52. Figure 1 、 5 .

[0070] Because the foam layer 10 is smaller than the shell 9, a gap is created, namely the limiting area 61. The limiting ring 110 installed in the limiting area 61 is used to prevent the foam layer 10 and the shell 9 from slipping during the pressurized bonding process. The limiting ring 110 is made of hard rubber. Figure 2 、 6 .

[0071] Furthermore, the bonding cavity 6 is used to place the shell 9 and foam layer 10 to be bonded; the shell 9 is placed on the carrying plate 2, and the foam layer 10 is placed on the shell 9, and the shell 9 and the foam layer 10 are concentric; the diameter length of the foam layer 10 is smaller than the diameter length of the shell 9.

[0072] Furthermore, the cover mounting seat 3 is fixedly mounted on the carrier plate 2; the top surface of the cover mounting seat 3 is evenly distributed with cover bolts 31 in the circumferential direction; the cover plate 4 is evenly distributed with cover bolt holes 41 that pass through the cover plate 4 in a number and position corresponding to the cover bolts 31 in the circumferential direction; the number of cover bolts 31 and cover bolt holes 41 is set as needed so that the two can be fixed; the cover bolts 31 pass through the cover bolt holes 41 and the cover plate 4 is installed on the cover mounting seat 3 through the nuts 43.

[0073] Furthermore, screw holes are evenly distributed in the circumferential direction of the bottom surface of the cover plate 4; the screw holes are marked in the accompanying drawings because screw holes are a common structural method that cooperates with screws and can be determined without any doubt; screws 51 are evenly distributed in the circumferential direction of the airbag 5 in a number and position corresponding to the screw holes; the screws 51 are fastened in the screw holes to install the airbag 5 on the cover plate 4.

[0074] The screws 51 are self-locking screws and do not need to be used in conjunction with nuts. The number of screws 51 and screw holes can be set as needed to fix the two columns.

[0075] Furthermore, the airbag 5 includes an expansion limiting layer 52, an expansion layer 53 is provided on the bottom surface of the expansion limiting layer 52, and an airbag cavity 54 is formed between the expansion limiting layer 52 and the expansion layer 53; an air nozzle 55 connected to the airbag cavity 54 is provided on the expansion limiting layer 52; a fixing layer 56 is formed at the junction of the expansion limiting layer 52 and the expansion layer 53, and screws 51 are pre-embedded on the fixing layer 56.

[0076] The top surface of the expansion limiting layer 52 is in contact with the bottom surface of the cover plate 4. When not inflated, the airbag cavity 54 is not expanded, and thus the expansion layer 53 is not fully unfolded. Only when air is taken in from the air nozzle 55, the airbag cavity 54 begins to expand. As air is continuously filled in, the amount of air in the airbag cavity 54 becomes larger and larger, thereby driving the expansion layer 53 to contact the surface of the foaming layer 10, until the expansion layer 53 is fully unfolded and in contact with the surface of the foaming layer 10 with no gap between the two. Inflation continues to apply pressure to the foaming layer 10 through the expansion layer 53 and bond it to the shell 9.

[0077] Furthermore, the cover plate 4 is provided with an air nozzle hole 42 , and the air nozzle 55 passes through the air nozzle hole 42 .

[0078] Furthermore, a pad 8 is provided between the cover mounting seat 3 and the cover plate 4; the pad 8 is in a circular ring shape and is placed directly on the cover mounting seat 3; the A surface 81 of the pad 8 contacts and cooperates with the bottom surface of the cover plate 4; the B surface 82 of the pad 8 contacts and cooperates with the top surface of the cover mounting seat 3; and the C surface 83 of the pad 8 contacts and cooperates with the shell 9.

[0079] Viewed from the longitudinal section of the pad 8, the C-surface 83 is a combination of two surfaces of opposite curvature, similar to the shape of the letter S. The design here is to fully fit with the shell 9 mentioned in this application. In actual use, the C-surface 83 can be designed according to the shape of the shell to achieve a fitting effect.

[0080] Furthermore, a limiting area 61 is formed between the foam layer 10 and the shell 9 in the bonding cavity 6; a limiting ring 110 is provided in the limiting area 61; a snap block 120 is provided on the bottom surface of the cover plate 4; one side of the limiting ring 110 contacts and cooperates with the foam layer 10, and the other side contacts and cooperates with the snap block 120.

[0081] The limiting ring 110 is circular in shape when viewed from above. In a longitudinal section, its D surface 111 contacts and cooperates with the foam layer 10, its E surface 112 contacts and cooperates with the housing 9, its F surface 113 contacts and cooperates with the engaging block 120, and its G surface 114 contacts and cooperates with the fixing layer 56. The structural design of the limiting ring 110 offsets the space in the limiting area 61, preventing the foam layer 10 from moving within the limiting area 61 and thus avoiding the phenomenon of the foam layer 10 and the housing 9 being attached and displaced. The H surface 121 of the engaging block 120 contacts and cooperates with the housing 9. The limiting ring 110 restricts the movement of the foam layer 10, and the engaging block 120 compresses the limiting ring 110, so that the foam layer 10 and the housing 9 are both stably fixed and prevented from displacement when pressurized. The limiting ring 110 can be made as a whole and placed in the limiting area 61, or the limiting ring 110 can be made into two parts in half, and then the two parts are placed in the limiting area 61 respectively and connected to form the shape of the limiting ring 110.

[0082] Furthermore, the carrying plate 2 includes a left carrying plate 21 and a right carrying plate 22; a plurality of brackets 1 are provided with an arc-shaped connecting block 130 at the center of a circle, and the arc-shaped connecting block 130 is used to connect the left carrying plate 21 and the right carrying plate 22; the center of the arc-shaped connecting block 130 is installed on the circular base 7; the left and right side walls of the arc-shaped connecting block 130 are symmetrically provided with snap-fitting grooves 131, the left carrying plate 21 is provided with a left snap-fitting strip 23 that is snap-fitted with the snap-fitting groove 131 of the left side wall, and the right carrying plate 22 is provided with a right snap-fitting strip 24 that is snap-fitted with the snap-fitting groove 131 of the right side wall; the top arc surfaces formed after the arc-shaped connecting block 130, the left carrying plate 21, and the right carrying plate 22 are snap-fitted are consistent.

[0083] The locking groove 131 has the same width and depth, and the left and right supporting plates 21 and 22 have the same structure; the arc angle between point A 132 and point B 133 of the connecting block 130 is consistent with the arc angle between point C 25 and point D 26 of the left supporting plate 21; the arc-shaped connecting block 130 has an "I" shape in longitudinal section; a spherical body can also be set on the supporting plate 2. The spherical body is used to facilitate the removal and placement of the shell 9 and leave a gap between the shell 9 and the supporting plate 2 through the spherical body. Secondly, it prevents the shell from sticking to the supporting plate 2 when under pressure.

[0084] A method for using an airbag-type pressure bonding device comprises the following steps:

[0085] S1. Place the housing 9 on the carrier plate 2 and apply adhesive to the upward concave surface of the housing 9;

[0086] S2, applying adhesive to the downward convex surface of the foam layer 10 and placing it on the concave surface of the housing 9;

[0087] S3. Place the limiting ring 110 in the limiting area 61 and place the pad 8 on the cover mounting seat 3.

[0088] S4. Place the cover plate 4 with the airbag 5 on the cover plate mounting seat 3 and tighten it with the nut 43;

[0089] S5. Inflate compressed air into the airbag cavity 54 through the air nozzle 55 until the expansion layer 53 is completely in contact with the foaming layer 10. Continue to inflate and pressurize until the foaming layer 10 is completely in contact with the shell 9 and pressurize. Maintain this pressure for 5 minutes.

[0090] S6, releasing the compressed air in the airbag cavity 54 from the air nozzle 55 to release the pressure in the airbag cavity;

[0091] S7, open the cover plate 4, remove the shell 9 and the foaming layer 10 that are bonded together, and the finished product is obtained.

[0092] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An airbag type pressure bonding device, characterized in that: It comprises a circular base (7), wherein a plurality of brackets (1) are provided on the top surface of the circular base (7), wherein the plurality of brackets (1) surround the circular base to form a circle, and wherein the height of the brackets (1) decreases from the outer circumference of the circle to the center of the circle; The top surfaces of the plurality of brackets (1) are provided with a carrying plate (2) with an opening facing upward and concave inward; A circular ring-shaped cover plate mounting seat (3) is provided on the top surface of the carrying plate (2); The cover plate mounting seat (3) is provided with a cover plate (4); An air bag (5) is provided on the bottom surface of the cover plate (4); A closed bonding cavity (6) is formed between the airbag (5) and the carrying plate (2).

2. The airbag type pressure bonding device according to claim 1, characterized in that: The bonding cavity (6) is used to place the shell (9) and the foaming layer (10) to be bonded; The shell (9) is placed on the carrier plate (2), the foaming layer (10) is placed on the shell (9), and the shell (9) and the foaming layer (10) are concentric; The diameter length of the foaming layer (10) is smaller than the diameter length of the shell (9).

3. The airbag type pressure bonding device according to claim 1, characterized in that: The cover plate mounting seat (3) is fixedly mounted on the carrying plate (2); The top surface of the cover plate mounting seat (3) is evenly distributed in the circumferential direction with cover plate bolts (31); The cover plate (4) is evenly distributed in the circumferential direction with cover plate bolt holes (41) penetrating the cover plate (4) in a number and position corresponding to the cover plate bolts (31); The cover plate bolts (31) pass through the cover plate bolt holes (41) and are fastened to the cover plate (4) on the cover plate mounting seat (3) via nuts (43).

4. The airbag type pressure bonding device according to claim 1, characterized in that: The bottom surface of the cover plate (4) is evenly distributed with screw holes in the circumferential direction; The airbag (5) is evenly distributed in the circumferential direction with screws (51) whose number and positions correspond to the screw holes; The screws (51) are fastened in the screw holes to mount the airbag (5) on the cover plate (4).

5. The airbag type pressure bonding device according to claim 4, characterized in that: The airbag (5) comprises an expansion limiting layer (52), an expansion layer (53) is provided on the bottom surface of the expansion limiting layer (52), and an airbag cavity (54) is formed between the expansion limiting layer (52) and the expansion layer (53); The expansion limiting layer (52) is provided with an air nozzle (55) which is in communication with the airbag cavity (54); A fixing layer (56) is formed at the junction of the expansion limiting layer (52) and the expansion layer (53), and screws (51) are pre-embedded in the fixing layer (56).

6. The airbag type pressure bonding device according to claim 5, characterized in that: The cover plate (4) is provided with an air nozzle hole (42), and the air nozzle (55) passes through the air nozzle hole (42).

7. The airbag type pressure bonding device according to claim 2, characterized in that: A cushion block (8) is provided between the cover plate mounting seat (3) and the cover plate (4); The A surface (81) of the cushion block (8) is in contact with the bottom surface of the cover plate (4); The B surface (82) of the cushion block (8) is in contact with and fits with the top surface of the cover plate mounting seat (3); The C surface (83) of the cushion block (8) is in contact with the housing (9).

8. The airbag type pressure bonding device according to claim 2, characterized in that: A limited area (61) is formed between the foaming layer (10) and the shell (9) in the bonding cavity (6); A limiting ring (110) is provided in the limiting area (61); A locking block (120) is provided on the bottom surface of the cover plate (4); One side of the limiting ring (110) is in contact with the foaming layer (10), and the other side is in contact with the locking block (120).

9. The airbag type pressure bonding device according to claim 1, characterized in that: The carrying plate (2) comprises a left carrying plate (21) and a right carrying plate (22); An arc-shaped connecting block (130) is provided at the center of a circle formed by a plurality of the brackets (1), and the arc-shaped connecting block (130) is used to connect the left supporting plate (21) and the right supporting plate (22); The left and right side walls of the arc-shaped connecting block (130) are symmetrically provided with snap-fitting grooves (131); the left supporting plate (21) is provided with a left snap-fitting strip (23) snap-fitting with the snap-fitting groove (131) of the left side wall; and the right supporting plate (22) is provided with a right snap-fitting strip (24) snap-fitting with the snap-fitting groove (131) of the right side wall; The top arc surfaces formed by the arc-shaped connecting block (130), the left supporting plate (21), and the right supporting plate (22) after being clamped together are consistent.

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