Sealing structure and vacuum bag for a press

Abstract

The present application relates to the field of structural parts of electrical equipment, in particular to a sealing structure and a vacuum air bag for a pressing machine, the sealing structure comprising a base body, a sealing part being arranged on the side wall of the base body and being unfolded after being pressed, the vacuum air bag for the pressing machine comprising the sealing structure, a fixing plate and a mounting plate, the base body being an air bag, the sealing part being arranged on the outer wall of the air bag, the opening end of the air bag being connected with the mounting plate, a containing cavity being arranged on the fixing plate and being used for containing the mounting plate and the air bag, the present application has the effects of reducing the loss of film paper, improving the use efficiency of film paper and saving film paper.

Description

Technical Field

[0001] This invention relates to the field of structural components of electrical equipment, and more particularly to a sealing structure and a vacuum bladder for a pressing machine. Background Technology

[0002] When producing flexible circuit boards, a laminating machine is usually used to press the film paper onto the flexible circuit board. Airbags are usually used in the laminating machine to press the flexible circuit board.

[0003] For example, Chinese Patent CN112235955A discloses an airbag assembly for a flexible printed circuit board vacuum laminating machine and a vacuum laminating machine. The airbag assembly includes a pressure frame fixing plate, an airbag, and an airbag mounting plate. The airbag covers at least one surface of the airbag mounting plate, and the opening edge of the airbag is pressed onto the airbag mounting plate by the pressure frame fixing plate. The airbag mounting plate is provided with an air inlet. An air guide channel is provided inside the airbag mounting plate, and the air guide channel communicates with the air inlet. A first surface of the airbag mounting plate is provided with multiple air outlets. The first surface is the surface of the airbag mounting plate completely covered by the airbag, and the multiple air outlets are all connected to the air guide channel and distributed at different positions in the air guide channel. Gas is injected into the airbag through the air inlet, and the flexible circuit board is laminated by the airbag.

[0004] During the lamination of flexible circuit boards, a protective film is typically placed over the board. The film is also placed on the surface of the pressure plate and the airbag. The flexible circuit board rests on the film on the pressure plate, and the airbag and pressure plate then press the board together. Maintaining a seal between the airbag and the pressure plate is crucial during lamination. Therefore, grooves are created on the pressure plate, and sealing rings are installed within these grooves. The addition of the sealing rings increases the volume of the airbag mounting plate and the pressure plate. However, the film that has come into contact with these components cannot be reused due to the high temperatures, resulting in significant film waste and low film utilization efficiency. Summary of the Invention

[0005] To reduce membrane paper waste, improve membrane paper utilization efficiency, and save membrane paper, this invention provides a sealing structure and a vacuum bladder for a pressing machine.

[0006] This invention provides a sealing structure, employing the following technical solution:

[0007] A sealing structure includes a substrate, wherein a sealing portion is provided on the sidewall of the substrate and expands upon being compressed.

[0008] In one specific implementation, the sealing portion is detachably connected to the substrate.

[0009] In one specific implementation, the base has a pin on the side facing the sealing part, and the sealing part has a hole on the side facing the base for inserting the pin.

[0010] In one specific implementation, the sealing portion is annular.

[0011] In one specific implementation, the end of the sealing portion away from the substrate is inclined outward, such that the opening of the sealing portion gradually narrows in the direction close to the substrate.

[0012] In one specific implementation, the sealing portion includes multiple sealing sheets, which overlap with adjacent sealing sheets.

[0013] In one specific implementation, the sealing surface width is 3-5 mm after the sealing part is compressed.

[0014] In one specific implementation, the thickness of the sealing portion gradually decreases in the direction away from the substrate.

[0015] The present invention also provides a vacuum bladder for a pressing machine, which adopts the following technical solution:

[0016] A vacuum bladder for a pressing machine includes the sealing structure described above, and also includes a fixing plate and a mounting plate. The base is an air bladder, the sealing part is disposed on the outer wall of the air bladder, the open end of the air bladder is connected to the mounting plate, and the fixing plate has a receiving cavity for accommodating the mounting plate and the air bladder.

[0017] In one specific implementation, the mounting plate is frame-shaped, and the receiving cavity is frame-shaped.

[0018] In one specific implementation, the fixing plate includes a connecting part and an air inlet part. The connecting part is plate-shaped, and the air inlet part is plate-shaped. The connecting part has a recess on the side facing the mounting plate, and the air inlet part is disposed in the recess. The gap between the inner wall of the connecting part and the side wall of the air inlet part forms a receiving cavity. The air inlet part has multiple air inlet grooves on the side facing the mounting plate, and the multiple air inlet grooves are interconnected. The air inlet part has a connecting hole communicating with the air inlet grooves, and the connecting part has an air inlet hole communicating with the connecting hole.

[0019] In one specific implementation, a clearance opening is provided on the side wall of the fixing plate.

[0020] In one specific implementation, the mounting plate has a mounting groove on the side facing the fixing plate, and a sealing ring is provided in the mounting groove.

[0021] In one specific implementation, the mounting plate has a mounting hole on the side facing the fixing plate. The mounting hole is a blind hole, and a screw is installed inside the blind hole.

[0022] In one specific implementation, the inner wall of the receiving cavity is inclined, and the inner diameter of the receiving cavity gradually increases from the inside to the outside.

[0023] In summary, the present invention has at least one of the following beneficial technical effects:

[0024] 1. After the airbag is equipped with a sealing part, the sealing part can replace the original sealing ring for sealing, which reduces the volume of the pressure plate, reduces the waste of membrane paper, improves the efficiency of membrane paper use, and saves membrane paper.

[0025] 2. Since the mounting plate has blind holes, screws can be used to connect the mounting plate and the fixing plate. Furthermore, compared with the through holes used in the existing foundation, the screw connection in the blind holes can eliminate the need for sealing rings while maintaining the same or even better sealing performance, which can effectively save production costs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the pressure plate and airbag in the existing technology.

[0027] Figure 2 This is a schematic diagram of the sealing structure.

[0028] Figure 3 This is a schematic diagram of a sealant applied to a pressing machine.

[0029] Figure 4 A cross-sectional view of the vacuum bladder used in the press.

[0030] Figure 5 This is an exploded view of the vacuum chamber used in the pressing machine.

[0031] Figure 6 It is a cross-sectional view showing the structure of the mounting holes.

[0032] Figure 7 yes Figure 4 A magnified view of a portion of point A in the middle.

[0033] Explanation of reference numerals in the attached drawings: 1. Fixing plate; 11. Connecting part; 12. Air inlet; 2. Mounting plate; 3. Airbag; 4. Receiving cavity; 5. Air inlet groove; 6. Connecting hole; 7. Air inlet; 8. Mounting groove; 9. Sealing ring; 10. Sealing part; 13. Relief opening; 14. Mounting hole. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-7 The present invention will be described in further detail below.

[0035] Reference Figure 1 The diagram shows the structure of the pressure plate and airbag in the prior art. The pressure plate has a groove, and a sealing ring is installed in the groove. In order to ensure the installation stability of the sealing ring and the pressure plate, there is a clear gap between the edge of the pressure plate and the groove. However, once the membrane paper enters this gap, it can no longer be used, which becomes membrane paper loss.

[0036] Reference Figure 2 and Figure 3 The sealing structure of this invention includes a base and a sealing part. The base is an airbag, and the sealing part is disposed on the outer wall of the airbag. The sealing part protrudes from the outer wall of the airbag and is annular. During the pressing of the flexible circuit board, the pressure plate squeezes the sealing part, causing it to unfold and be clamped by the pressure plate and the airbag mounting plate. The width L of the contact surface between the sealing part and the pressure plate and the airbag mounting plate is 3-5 mm. The sealing part seals the gap between the airbag mounting plate and the pressure plate. Since it is no longer necessary to set grooves and sealing rings on the pressure plate, the volume of the pressure plate can be reduced, thereby reducing the loss of the membrane paper. When the contact surface width is less than 3 mm, the sealing performance of the sealing part is reduced, and there is a possibility of insufficient sealing performance, resulting in air leakage. When the contact surface width is greater than 5 mm, although a good sealing performance can be maintained, the deformation of the sealing part is large, which may damage the membrane paper during the pressing process and affect the pressing effect of the flexible circuit board.

[0037] Because the sealing part is prone to aging and damage under continuous use and compression in high temperature and high pressure environments, the thickness of the sealing part gradually increases towards the airbag to extend its service life and improve the stability of the connection between the sealing part and the airbag. The inner wall of the sealing part is inclined, that is, the inner diameter of the sealing part gradually increases away from the airbag. When the pressure plate and the airbag mounting plate compress the sealing part, the inclined inner wall of the sealing part guides the deformation direction of the sealing part, causing the sealing part to expand further outward, rather than causing the sealing part to shrink inward locally, thus ensuring the sealing effect between the sealing plate and the airbag mounting plate.

[0038] It should be noted that the sealing structure disclosed in this invention can be used not only for the airbags of pressing machines, but also for sealing between adjacent plates when compression is required. The sealing structure is not limited to a ring shape; it can also be a sheet-like sealing plate (not shown in the figure). Multiple sealing plates are arranged in a ring, with overlapping portions between adjacent plates. When the pressure plate and the airbag mounting plate are compressed, the sealing plates connect to each other in pairs, and the overlapping portions seal the gaps between the sealing plates, forming a ring-shaped sealing area. The sealing part and the airbag can also be detachably connected via a pin and a hole. For example, a pin can be fixed to the outer wall of the airbag, and a hole can be opened on the side of the sealing part facing the airbag for the pin to be inserted. The connection between the sealing part and the airbag is achieved by inserting the pin into the hole (not shown in the figure).

[0039] Reference Figure 4 and Figure 5 The vacuum bladder for a pressing machine disclosed in this invention utilizes the aforementioned sealing structure. The vacuum bladder for the pressing machine includes a fixing plate 1, a mounting plate 2, and an air bladder 3. A fixing groove extending to the side wall of the mounting plate 2 is formed on the top surface of the mounting plate 2. The edge of the air bladder 3 is fixedly connected to the mounting plate 2 through the fixing groove. A cavity is provided in the middle of the mounting plate 2, making the mounting plate 2 as a whole rectangular frame.

[0040] Reference Figure 4 and Figure 5 The fixing plate 1 includes a connecting part 11 and an air inlet 12. The connecting part 11 is plate-shaped and is used to connect with a pressing machine. The side of the connecting part 11 facing the mounting plate 2 is recessed away from the mounting plate 2. The air inlet 12 is disposed in the recess, and there is a gap between the side wall of the air inlet 12 and the inner wall of the recess, forming a receiving cavity 4. The air inlet 12 is plate-shaped, and the thickness of the air inlet 12 is less than the depth of the recess. The area between the side of the air inlet 12 facing the mounting plate 2 and the side of the connecting part 11 facing the mounting plate 2 is part of the receiving cavity 4. After the mounting plate 2 is connected to the fixing plate 1, both the mounting plate 2 and the airbag 3 are in the receiving cavity 4, and the air inlet 12 of the fixing plate 1 enters the cavity of the mounting plate 2. Since the fixing plate 1 needs to withstand pressure and the reaction force of the airbag 3 when pressing the film paper onto the flexible circuit board, the strength of the fixing plate 1 is very important. In the prior art, since the mounting plate 2 is plate-shaped as a whole, and the mounting plate 2 and the airbag 3 are jointly arranged in the receiving cavity 4 of the fixing plate 1, when the fixing plate 1 of the same thickness as the present invention is used, the strength of the fixing plate 1 is relatively low; when maintaining the same strength as the present application, the thickness of the fixing plate 1 needs to be increased, thereby increasing the production cost.

[0041] Reference Figure 4 and Figure 5The air intake section 12 of the fixing plate 1 has multiple air intake grooves 5 on the side facing the airbag 3 of the mounting plate 2. These grooves 5 intersect each other in a grid pattern and are interconnected. A connecting hole 6 is located at the center of the air intake section 12, at the intersection of the air intake grooves 5. An air intake hole 7 is located on the side wall of the connecting section 11 of the fixing plate 1, communicating with the connecting hole 6 and, consequently, with all the air intake grooves 5. By supplying air into the air intake hole 7, the airflow is dispersed along the air intake hole 7, the connecting hole 6, and the air intake grooves 5 into the airbag 3, causing the airbag 3 to inflate uniformly.

[0042] Reference Figure 5 and Figure 6 The mounting plate 2 has multiple mounting holes 14 on its side facing the fixing plate 1. All mounting holes 14 are blind holes, meaning they do not penetrate the mounting plate 2. The fixing plate 1 has through holes corresponding to the mounting holes 14. Screws are installed in the through holes and connected to the mounting holes 14 via threads, thus fixing the fixing plate 1 to the mounting plate 2. Because the mounting holes 14 are not connected to the airbag 3, there is no issue of airflow escaping along the mounting holes 14 or through holes. Compared to existing technologies where the mounting holes 14 penetrate the mounting plate 2, requiring sealing rings to prevent airflow escape, this design not only eliminates the need for sealing rings, reducing production costs, but also provides better sealing performance.

[0043] Reference Figure 4 and Figure 5 The mounting plate 2 has a mounting groove 8 on the side facing the fixing plate 1. A sealing ring 9 is provided in the mounting groove 8. The sealing ring 9 is located on the side of the mounting plate 2 near the air inlet 12 of the fixing plate 1. It seals the gap between the mounting plate 2 and the fixing plate 1, preventing the airflow in the airbag 3 from flowing to the mounting hole 14 and the through hole, and further improving the sealing performance of the connection between the mounting plate 2 and the fixing plate 1.

[0044] Reference Figure 4 and Figure 5 The outer wall of the airbag 3 is provided with a sealing part 10, which is the same as the sealing part in the sealing structure described above, and will not be described again. The sealing part 10 seals the gap between the mounting plate 2 and the fixing plate 1, which can reduce the wear of the membrane paper. (Refer to...) Figure 3 and Figure 7 The fixed plate 1 has a clearance opening 13 that communicates with the receiving cavity 4. The clearance opening prevents the fixed plate from directly contacting the membrane paper. The pressure plate can be smaller than the fixed plate, meaning there is a gap between the edges of the pressure plate and the fixed plate. The clearance opening is located in the area where the fixed plate is larger than the pressure plate. The fixed plate and the pressure plate only contact each other through the sealing part, and the only areas that affect the membrane paper are the original working area and the area where the sealing part contacts the membrane paper. This significantly reduces the area of ​​membrane paper wastage, improves the utilization rate of the membrane paper, and saves membrane paper.

[0045] The implementation principle of this invention is as follows: First, the airbag 3 is fixed on the mounting plate 2. Then, the fixing plate 1 is fixed to the mounting plate 2 with screws, and the air inlet is connected to the air source. When pressing the membrane paper and the flexible circuit board, the air source inflates the air inlet 7, the airflow enters the airbag 3, and the airbag 3 expands. At the same time, the fixing plate 1 moves the airbag 3 towards the flexible circuit board. The sealing part 10 on the airbag 3 first contacts the membrane paper and undergoes elastic deformation until the airbag 3 contacts the membrane paper. The sealing part seals the gap between the fixing plate and the pressure plate, and the membrane paper is only worn in the original working area and the area in contact with the sealing part, reducing membrane paper wear and saving membrane paper. The fixing plate 1 presses down further to complete the uniform pressing of the flexible circuit board.

[0046] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A vacuum bladder for a pressing machine, characterized in that: It includes a sealing structure, as well as a fixing plate and a mounting plate. The sealing structure includes a base, on the side wall of which a sealing portion is provided that expands upon being compressed; it also includes a pressure plate, on which no groove or sealing ring is provided; the end of the sealing portion away from the base is inclined outward, such that the opening of the sealing portion gradually narrows along the direction close to the base; after being compressed, the sealing surface width is 3-5mm; The base is an airbag, the sealing part is disposed on the outer wall of the airbag, the opening end of the airbag is connected to the mounting plate, and the fixing plate is provided with a receiving cavity for accommodating the mounting plate and the airbag; the mounting plate (2) is frame-shaped, and the receiving cavity (4) is frame-shaped; The fixing plate (1) includes a connecting part (11) and an air inlet (12). The connecting part (11) is plate-shaped, and the air inlet (12) is plate-shaped. The connecting part (11) has a recess on the side facing the mounting plate (2). The air inlet (12) is disposed in the recess. The gap between the inner wall of the connecting part (11) and the side wall of the air inlet (12) forms a receiving cavity (4). The air inlet (12) has multiple air inlet grooves (5) on the side facing the mounting plate (2). The multiple air inlet grooves (5) are interconnected. The air inlet (12) has a connecting hole (6) communicating with the air inlet grooves (5). The connecting part (11) has an air inlet hole (7) communicating with the connecting hole (6).

2. The vacuum bladder for a pressing machine according to claim 1, characterized in that: The sealing part is detachably connected to the base.

3. The vacuum bladder for a pressing machine according to claim 2, characterized in that: The base body has a pin on the side facing the sealing part, and the sealing part has a hole on the side facing the base body for inserting the pin.

4. The vacuum bladder for a pressing machine according to claim 1, characterized in that: The sealing part is annular.

5. The vacuum bladder for a pressing machine according to claim 1, characterized in that: The sealing part includes multiple sealing sheets, and the sealing sheets overlap with adjacent sealing sheets.

6. The vacuum bladder for a pressing machine according to claim 1, characterized in that: The thickness of the sealing portion gradually decreases in the direction away from the substrate.

7. The vacuum bladder for a pressing machine according to claim 1, characterized in that: The side wall of the fixing plate (1) is provided with a clearance opening (13).

8. The vacuum bladder for a pressing machine according to claim 1, characterized in that: The mounting plate (2) has a mounting groove (8) on the side facing the fixing plate (1), and a sealing ring (9) is provided in the mounting groove (8).

9. The vacuum bladder for a pressing machine according to claim 1, characterized in that: The mounting plate (2) has a mounting hole (14) on the side facing the fixing plate (1). The mounting hole (14) is a blind hole and a screw is provided in the blind hole.

10. The vacuum bladder for a pressing machine according to claim 1, characterized in that: The inner wall of the receiving cavity is inclined, and the inner diameter of the receiving cavity gradually increases from the inside to the outside.

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