Cavity air tightness detection clamp

Abstract

A product to be detected comprises a cavity facing a detection platform, the cavity is provided with a first convex wall and a second convex wall which are arranged at an interval, a second cavity with a small proportion is enclosed between the first convex wall and the second convex wall, the first convex wall encloses a first cavity which is communicated with the second cavity and has a large proportion, and the second convex wall encloses a second cavity with a large proportion. The length of the second convex wall is larger than that of the first convex wall, the sealing piece can enable the second cavity with the small proportion to form an independent closed space, the sealing piece comprises a first sealing part abutting against the end of the first convex wall and a second sealing part abutting against the end of the second convex wall, and a distance k1 is formed between the top end of the first sealing part and the detection platform. A distance k2 is formed between the top end part of the second sealing part and the detection platform, and the distances k1 and k2 meet the following conditions: k1gt; k2. The air tightness detection device has the advantages that when the air tightness of the second cavity is detected, air directly enters the second cavity and is filled with the second cavity, the air inflation speed is high and uniform, and the air tightness detection efficiency and accuracy are improved.

Description

Technical Field

[0001] The utility model relates to the detection field, in particular to a cavity air tightness detection fixture. Background Art

[0002] A product with a cavity structure usually needs to be tested for air tightness using a leak detection device before it leaves the factory to ensure that the cavity is tight, complete, leak-free, and has no quality problems. For products to be tested with only one cavity, if you want to improve the efficiency of air tightness testing, the invention patent application "Air tightness testing method for workpieces with large-volume cavities" with patent application number CN202311807928.6 (publication number CN 117968973A) discloses an air tightness testing method. This method saves as much inflation time as possible by switching the actions between the modules, improves the testing efficiency, and avoids the influencing factors such as pressure fluctuations caused by temperature changes caused by repeated inflation, thereby improving the testing accuracy.

[0003] As for Figure 1 The product to be tested shown in the figure includes a cavity to be tested, the periphery of the cavity is surrounded by a second convex wall 4′ to form a cavity, wherein the cavity includes a first cavity 1′ and a second cavity 2′ connected to the first cavity 1′ and arranged on the periphery of the first cavity 1′, the first cavity 1′ is located in the center and occupies a larger area of ​​the cavity, the second cavity 2′ is annular and occupies a smaller area of ​​the cavity, and the first cavity 1′ is formed by surrounding a first convex wall 3′ spaced apart from the second convex wall 4′, and the length of the second convex wall 4′ is longer than the first convex wall 3′.

[0004] If the above method is used to perform air tightness test on the product to be tested, when testing the air tightness of the second cavity 2′, even if the first cavity 1′ needs to be tested separately, the two are connected and the length of the second convex wall 4′ is longer than the first convex wall 3′. Therefore, during the test, the periphery of the second convex wall 4′ can only be sealed first, and the first cavity 1′ can be inflated at the same time. Although the area of ​​the cavity to be tested occupied by the second cavity 2′ is smaller, the gas needs to fill the first cavity 1′ and the second cavity 2′ at the same time, which can easily cause a slow inflation speed and uneven inflation, thereby affecting the efficiency and accuracy of the air tightness test of the product to be tested. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a cavity air tightness detection fixture for better improving the efficiency of air tightness detection in view of the above-mentioned existing technical status, especially for products in which the cavities to be tested are interconnected but the cavities that need to be independently tested account for a relatively small proportion.

[0006] The technical solution adopted by the utility model to solve the above technical problems is: the cavity air tightness detection fixture comprises:

[0007] The detection platform is used to place the product to be tested, wherein the product to be tested includes a cavity facing the detection platform, the cavity has a first convex wall and a second convex wall arranged at intervals, a second cavity with a smaller proportion is formed between the first convex wall and the second convex wall, the first convex wall forms a first cavity connected to the second cavity and with a larger proportion, and the second convex wall is longer than the first convex wall;

[0008] A positioning component, disposed on the detection platform, for positioning the product to be detected;

[0009] A clamping mechanism, disposed above the testing platform, for clamping the product to be tested;

[0010] Features:

[0011] The detection platform is also provided with a seal that can form an independent enclosed space with a second cavity that occupies a small area. The seal includes a first sealing portion that respectively abuts against the end of the first convex wall and a second sealing portion that abuts against the end of the second convex wall. There is a distance k1 between the top end of the first sealing portion and the detection platform, and there is a distance k2 between the top end of the second sealing portion and the detection platform. The distances k1 and k2 satisfy: k1>k2.

[0012] The first sealing part can be annular, but in order to facilitate the positioning of the product to be tested, preferably, the first sealing part is block-shaped and arranged in the first cavity, and the first sealing part is in contact with the inner wall of the first convex wall by means of its side wall. In this way, the first sealing part has a dual purpose, which can not only facilitate the placement of the product to be tested on the detection platform, and the first sealing part is not easy to deform, but also can seal the first cavity, so that the gas can quickly fill the second cavity.

[0013] In order to make the position of the seal on the detection platform correspond to its position on the product to be tested, the detection platform further includes a shelf for the seal to be placed, the seal is arranged in the center of the shelf, and the air inlet hole for supplying air to the second cavity is arranged between the first sealing part and the second convex wall of the seal, and the second sealing part is arranged on the periphery of the first sealing part. In this way, after the second cavity forms an independent closed space, the closed space can be inflated and tested through the air inlet hole.

[0014] The positioning assembly has a variety of structures. From the perspective of structural simplicity, preferably, the positioning assembly includes at least two positioning blocks arranged on the shelf, each positioning block is arranged on the shelf and arranged on the periphery of the sealing member, each positioning block includes a vertical positioning portion arranged vertically relative to the shelf and a transverse portion movable relative to the shelf, and a limiting hole for limiting the moving direction is provided on the transverse portion. The positioning assembly positions the periphery of the product to be tested by moving the transverse portion.

[0015] The clamping mechanism has a variety of structures. From the perspective of simple structure, preferably, the clamping mechanism includes a first plate body, a guide column arranged on the lower surface of the first plate body, and a clamping part connected to the end of the guide column. The clamping part can move up and down between the initial position and the final position along the guide column under the drive of the driving source to complete the clamping action. When the clamping mechanism is working, the driving source drives the clamping part to move downward to clamp the product to be tested.

[0016] Furthermore, the detection platform is also provided with a limit assembly capable of limiting the downward movement direction of the pressing part, and the limit assembly can ensure the accuracy of the downward movement direction of the pressing part.

[0017] Furthermore, the limiting assembly includes a first limiting column provided on the detection platform and a second limiting column provided on the first plate body, the second limiting column is provided on the outer periphery of the guide column, and when the first limiting column and the second limiting column are in a limiting cooperation state, the clamping part can be driven to move down to be close to the product to be tested. In this way, whether the pressing position of the clamping mechanism is accurate can be judged according to the state of the first limiting column and the second limiting column when the clamping mechanism moves down.

[0018] There are many structures for the first limiting column and the second limiting column to cooperate with each other. From the perspective of structural simplicity, the first limiting column has a groove, and the second limiting column has a convex portion that cooperates with the groove. In this way, the second limiting column moves downward so that the convex portion can extend into the groove, thus completing the limiting cooperation.

[0019] Compared with the prior art, the advantages of the utility model are that the sealing member in the cavity air tightness detection fixture includes a first sealing portion which is respectively abutted against the end of the first convex wall and a second sealing portion which is respectively abutted against the end of the second convex wall, and the second cavity with a smaller occupancy can be formed into an independent closed space. In this way, when detecting the air tightness of the second cavity, the gas will not enter the first cavity first but directly enter the second cavity and fill it. The inflation speed is fast and uniform, which improves the efficiency and accuracy of air tightness detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the product to be tested in the background technology of the utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the cavity air tightness detection fixture in the embodiment of the utility model;

[0022] Figure 3 This is a schematic structural diagram of a sealing member, a shelf and a positioning pin in an embodiment of the utility model;

[0023] Figure 4 It is a schematic structural diagram of the product to be tested, the sealing member and the positioning pin in the embodiment of the utility model. DETAILED DESCRIPTION

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] like Figure 2-4 The preferred embodiment of the utility model is shown in FIG. 1. The cavity air tightness detection fixture in this embodiment includes a detection platform 1, a positioning assembly 2, a pressing mechanism 3, a sealing member 4, a dotting mechanism 6 and an air intake mechanism.

[0026] Among them, the detection platform 1 is used to place the product to be tested 5, which includes a cavity facing the detection platform 1, and the cavity has a first convex wall 53 and a second convex wall 54 arranged at intervals, and a second cavity 52 with a smaller proportion is formed between the first convex wall 53 and the second convex wall 54, and the first convex wall 53 forms a first cavity 51 that is connected to the second cavity 52 and has a larger proportion, and the length of the second convex wall 54 is longer than the first convex wall 53.

[0027] In this embodiment, the detection platform 1 includes a base 11 and a shelf 12 arranged above the base 11 for the seal 4 to rest. The seal 4 includes a first sealing portion 41 that abuts against the end of the first convex wall 53 and a second sealing portion 42 that abuts against the end of the second convex wall 54. The first sealing portion 41 is block-shaped and is arranged in the first cavity 51. The first sealing portion 41 is in contact with the inner wall of the first convex wall 53 by means of its side circumferential wall, and the second sealing portion 41 is annularly arranged on the outer periphery of the first sealing portion 41. In this way, the seal 4 can form an independent enclosed space with the second cavity 52 that occupies a small area, as shown in FIG. Figure 4 shown.

[0028] Since the first sealing portion 41 is arranged in the first cavity 51 and the side wall is in contact with the inner wall of the first convex wall 53, the second sealing portion 41 is abutted against the end of the second convex wall 54, so the distance k1 between the top end of the first sealing portion 41 and the detection platform 1 and the distance k2 between the top end of the second sealing portion 42 and the detection platform 1 satisfy the relationship k1>k2.

[0029] The air inlet hole 12 a for supplying air to the second cavity 52 is disposed between the first sealing portion 41 and the second convex wall 54 of the sealing member 4 . The air inlet hole 12 a can supply air to the second cavity 52 through an air inlet mechanism.

[0030] like Figure 2As shown, the positioning assembly 2 includes four positioning blocks 21 and two positioning pins 22 arranged on the shelf 12. Each positioning block 21 is arranged on the shelf 12 and arranged on the periphery of the sealing member 4 to position the product to be tested 5. Each positioning block 21 includes a vertical positioning portion 211 arranged vertically relative to the shelf 12 and a transverse portion 212 that can move relative to the shelf 12. The transverse portion 212 is provided with a limiting hole 21a that limits the moving direction. The product to be tested 5 and the shelf 12 have corresponding positioning holes, and the two positioning pins 22 pass through the positioning holes to fix the product to be tested 5 on the shelf 12.

[0031] The clamping mechanism 3 disposed above the detection platform 1 includes a first plate body 33, a guide column 32 disposed on the lower surface of the first plate body 33, and a clamping portion 31 connected to the end of the guide column 32. The clamping portion 31 can move up and down between the initial position and the final position along the guide column 32 under the drive of a driving source to complete a clamping action or a loosening action. The driving source is a cylinder, which is not shown in the figure.

[0032] In order to limit the downward pressing direction of the clamping mechanism 3, the limiting assembly 6 includes a first limiting column 61 provided on the base 11 in the detection platform 1 and a second limiting column 62 provided on the first plate 33, and the second limiting column 62 is provided on the outer periphery of the guide column 32. The first limiting column 61 has a groove 61a, and the second limiting column 62 has a convex portion 62a that cooperates with the groove 61a. When the first limiting column 61 and the second limiting column 62 are in a limited cooperation state, the clamping part 31 can be driven to move down close to the product 5 to be tested.

[0033] Of course, the structure of the limit matching is also shown as the third limit column 63 provided on the base 11 in the detection platform 1 and the fourth limit column 64 provided on the first plate 33. The third limit column 63 and the fourth limit column 64 are in contact to complete the limit matching. The above two limit matching structures each have two, and every two identical limit matching structures are arranged diagonally, so that the two limit matching can be more stable.

[0034] The working principle of this embodiment is as follows: the cavity of the product to be tested 5 is placed toward the shelf 12 and positioned by the positioning block 21 and the first sealing portion 41, so that the first sealing portion 41 is arranged in the first cavity 51 and the side wall is in contact with the inner wall of the first convex wall 53, and the second sealing portion 41 is against the end of the second convex wall 54, so that the sealing member 4 can form an independent closed space with the second cavity 52 which occupies a small area, and then the positioning pin 22 fixes the product to be tested 5 on the shelf 12, and the driving source in the clamping mechanism 3 drives the clamping portion 31 to move downward and accurately clamps the product to be tested 5 through the limit assembly 6, and then the second cavity 52 is inflated through the air inlet 12a. Due to the setting of the sealing member, the gas will only quickly fill the second cavity 52, and then a special instrument is used to test whether there is gas leakage to detect the air tightness of the second cavity 52; if the air tightness of the product to be tested 5 is good, the dotting mechanism 6 works to mark the product to be tested 5; otherwise, the dotting mechanism 6 does not work.

Claims

1. A cavity air tightness detection fixture, comprising: A testing platform (1) is used to place a product to be tested (5), wherein the product to be tested (5) comprises a cavity facing the testing platform (1), the cavity having a first convex wall (53) and a second convex wall (54) arranged at intervals, a second cavity (52) of a smaller proportion is formed between the first convex wall (53) and the second convex wall (54), the first convex wall (53) forms a first cavity (51) of a larger proportion and connected to the second cavity (52), and the second convex wall (54) is longer than the first convex wall (53); A positioning component (2), disposed on the detection platform (1), and used for positioning the product to be detected (5); A clamping mechanism (3), disposed above the testing platform (1), and used for clamping the product to be tested (5); Features: The detection platform (1) is also provided with a sealing member (4) capable of forming an independent enclosed space with a second cavity (52) occupying a small area, the sealing member (4) comprising a first sealing portion (41) respectively abutting against the end of the first convex wall (53) and a second sealing portion (42) abutting against the end of the second convex wall (54), a distance k1 being provided between the top end of the first sealing portion (41) and the detection platform (1), a distance k2 being provided between the top end of the second sealing portion (42) and the detection platform (1), and the distances k1 and k2 satisfy: k1>k2.

2. The cavity air tightness detection fixture according to claim 1, characterized in that: The first sealing portion (41) is block-shaped and is disposed in the first cavity (51). The first sealing portion (41) is fitted with the inner wall of the first convex wall (53) by means of its side peripheral wall.

3. The cavity air tightness detection fixture according to claim 2, characterized in that: The detection platform (1) comprises a shelf (12) for the sealing member (4) to be placed, the sealing member (4) being arranged at the center of the shelf (12), and an air inlet (12a) for supplying air to the second cavity (52) being arranged between a first sealing portion (41) and a second convex wall (54) of the sealing member (4), and the second sealing portion (42) being arranged at the periphery of the first sealing portion (41).

4. The cavity air tightness detection fixture according to claim 3, characterized in that: The positioning assembly (2) comprises at least two positioning blocks (21) arranged on the shelf (12), each positioning block (21) being arranged on the shelf (12) and arranged on the periphery of the sealing member (4), each positioning block (21) comprising a vertical positioning portion (211) arranged vertically relative to the shelf (12) and a transverse portion (212) movable relative to the shelf (12), and a limiting hole (21a) for limiting the moving direction being provided on the transverse portion (212).

5. The cavity air tightness detection fixture according to any one of claims 1 to 4, characterized in that: The clamping mechanism (3) comprises a first plate body (33), a guide column (32) arranged on the lower surface of the first plate body (33), and a clamping portion (31) connected to the end of the guide column (32); the clamping portion (31) can move up and down between an initial position and a final position along the guide column (32) under the drive of a driving source to complete a clamping action.

6. The cavity air tightness detection fixture according to claim 5, characterized in that: The detection platform is also provided with a limit assembly (6) capable of limiting the downward movement direction of the pressing portion (31).

7. The cavity air tightness detection fixture according to claim 6, characterized in that: The limiting assembly (6) comprises a first limiting column (61) provided on the detection platform (1) and a second limiting column (62) provided on the first plate body (33); the second limiting column (62) is provided on the outer periphery of the guide column (32); when the first limiting column (61) and the second limiting column (62) are in a limiting cooperation state, the clamping portion (31) can be driven to move downward close to the product to be tested (5).

8. The cavity air tightness detection fixture according to claim 7, characterized in that: The first limiting column (61) has a groove (61a), and the second limiting column (62) has a convex portion (62a) matched with the groove (61a).

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