Clamp for detecting air tightness of product

Abstract

A clamp for detecting air tightness of a product comprises a bottom plate for placing the product to be detected, a sealing ring and a filling block are arranged on the bottom plate, and the clamp is characterized in that a groove for embedding the sealing ring is formed in the position, corresponding to a second cavity, of the bottom plate, a first cavity is filled with the filling block, and a gap is reserved between the filling block and the first cavity; the gap and the second cavity are divided into two independent spaces by the annular second convex wall, the bottom plate is provided with an air inlet corresponding to the second cavity, and the air tightness of the first cavity can be judged by means of the annular second convex wall in the state that an external air supply mechanism only supplies air to the second cavity. The device has the advantages that the first cavity and the second cavity of the to-be-detected product share the second convex wall, whether the second convex wall is complete or not can be obtained only by performing inflation detection on the second cavity, if the second convex wall is damaged, the first cavity and the second cavity can generate a blow-by phenomenon, a measured value can exceed a preset value, and the detection result is accurate. Therefore, the air tightness of the first cavity can be judged by means of the second convex wall.

Description

Technical Field

[0001] The utility model relates to the technical field of air tightness detection, in particular to a clamp for detecting the air tightness of a product. Background Art

[0002] The production requirements for new energy vehicle parts often place higher demands on waterproofness or airtightness. Only products that meet these requirements are allowed to leave the factory. Waterproofness or airtightness inspections can be performed using devices such as those disclosed in Chinese patent number "202320028073.6." Both devices utilize air to quickly and accurately determine the degree of leakage in an object.

[0003] In actual testing, the inspection object sometimes involves multiple cavities, and the multiple cavities are independent of each other and adjacent to each other, such as Figure 1 As shown, the mold cavity of the product to be tested 1′ includes a first mold cavity 13′ and a second mold cavity 14′ provided on the periphery of the first mold cavity 13′. The first mold cavity 13′ is located in the center and occupies a larger area of ​​the mold cavity, while the second mold cavity 14′ is annular and occupies a smaller area of ​​the mold cavity. The first mold cavity 13′ is surrounded by the second convex wall 12′, and the second mold cavity 14′ is surrounded by the first convex wall 11′ and the second convex wall 12′, that is, the two mold cavities share the second convex wall 12′.

[0004] If the above device is used to perform airtightness testing, such as gas testing, on the cavity of the product to be tested 1′, it is necessary to perform independent tests on the first cavity 13′ and the second cavity 14′. Not only is it necessary to selectively fill one of the cavities with a filling block, but the other cavity also needs to be tested for airtightness, which makes the testing steps more complicated. In addition, especially for large cavities such as the first cavity 13′, the amount of gas required for gas testing is relatively large, and the testing time is also long, which ultimately makes the testing efficiency relatively low. Therefore, further improvements are needed to address the above problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a fixture that can simultaneously detect multiple adjacent cavities and requires less inflation volume, in response to the above-mentioned existing technical status. It is particularly suitable for products to be tested whose multiple cavities share the same convex wall.

[0006] The technical solution adopted by the utility model to solve the technical problem is as follows: the fixture for detecting the air tightness of a product includes a base plate for placing the product to be tested, the base plate is provided with a sealing ring and a filling block, the cavity to be tested of the product to be tested includes a first cavity and a second cavity located outside the first cavity, and they share a second annular convex wall, the first cavity being larger than the second cavity;

[0007] The feature is that: a groove for embedding a sealing ring is provided at a position of the bottom plate corresponding to the second cavity, the filling block is filled in the first cavity, and a gap is reserved with the first cavity, and the annular second convex wall separates the gap and the second cavity into two independent spaces, and an air inlet is opened on the bottom plate corresponding to the second cavity. When the external air supply mechanism only supplies air to the second cavity, the air tightness of the first cavity can be determined with the help of the annular second convex wall.

[0008] To facilitate air intake, an air intake channel is further provided in the bottom plate, an air outlet end of the air intake channel is communicated with the air inlet, and an air intake end of the air intake channel is communicated with an external air supply mechanism.

[0009] Furthermore, the product to be tested is provided with two first cavities, each of which is spaced apart and arranged side by side. A connecting passage connecting to the second cavity is left between the two first cavities. Correspondingly, two filling blocks are also provided. The base plate has a section between the two filling blocks for the connecting passages to abut against each other. The air inlet is provided in the center of the section, and the external air supply mechanism enters the connecting passage through the air inlet and then enters the second cavity. There can be one or two first cavities. When there are two first cavities, in order to supply air to the second cavity more quickly, the air inlet is provided in the section between the two first cavities, which can fill the second cavity at a faster speed, thereby improving the efficiency of testing the air tightness of the second cavity.

[0010] Furthermore, the base plate is provided with a positioning portion for positioning the product to be tested and a pressing portion for pressing the product to be tested. The positioning portion positions the product to be tested, while the pressing portion compresses the product to be tested. The pressing portion can be manually pressed or employs a pressing cylinder, as commonly used by the applicant. For its specific structure, please refer to the pressing portion described in Patent No. ZL202222013841.9.

[0011] In order to facilitate the transfer of the clamp by the inspectors, preferably, a handle for easy lifting is provided on the periphery of the bottom plate, and the cross section of the handle is in the shape of an inverted "U".

[0012] Compared with the prior art, the advantages of the present invention are:

[0013] 1. Since the first and second cavities of the product to be tested share the second convex wall, the integrity of the second convex wall can be determined by simply inflating the second cavity. If the second convex wall is damaged, air leakage will occur between the first and second cavities, and the measured value will exceed the preset value. The airtightness of the first cavity can be determined with the help of the second convex wall.

[0014] 2. Only the second cavity is inflated for testing, which requires less gas than the first and second cavities.

[0015] 3. Finally, with the help of the filling block provided in the first cavity, part of the first cavity can be filled, thereby reducing the space required to inflate the first cavity. Even if the second convex wall is damaged, the external air supply mechanism only needs a smaller amount of air to determine whether there is air leakage between the first cavity and the second cavity, thereby improving the efficiency of air tightness detection of the product to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the product to be tested in the background technology;

[0017] Figure 2 This is a schematic diagram of the structure of the product to be tested installed in the embodiment of the utility model;

[0018] Figure 3 This is a schematic structural diagram of an embodiment of the present utility model (seal ring, pressure plate and fasteners are omitted);

[0019] Figure 4 A cross-sectional view of an embodiment of the present utility model;

[0020] Figure 5 This is a cross-sectional view of a product to be tested being pressed and positioned on a fixture in an embodiment of the present utility model. DETAILED DESCRIPTION

[0021] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0022] like Figures 2 to 5 The following is the best embodiment of the present invention. The fixture of this embodiment is used to detect Figure 1 The product to be tested 1′ shown in the figure has a mold cavity comprising a first mold cavity 13′ and a second mold cavity 14′ arranged on the periphery of the first mold cavity 13′. The first mold cavity 13′ is located in the center and occupies a larger area of ​​the mold cavity. The second mold cavity 14′ is annular and occupies a smaller area of ​​the mold cavity. The first mold cavity 13′ is formed by being surrounded by the second convex wall 12′, and the second mold cavity 14′ is formed by being surrounded by the first convex wall 11′ and the second convex wall 12′, that is, the two mold cavities share the second convex wall 12′. There are two first mold cavities 13′ in the product to be tested 1′, and each first mold cavity 13′ is arranged side by side at intervals. A connecting channel 10′ is left between the two first mold cavities 13′ to connect with the second mold cavity 14′. In addition, four positioning holes 15′ are provided around the product to be tested 1′. Figures 2-4As shown, the fixture of this embodiment includes a base plate 2 for placing the product 1′ to be tested, and a sealing ring 3 and a filling block 4 are provided on the base plate 2. The base plate 2 is provided with a groove 21 for embedding the sealing ring 3 at a position corresponding to the second cavity 14′, and the filling block 4 is used to fill the first cavity 13′ and a gap 10 is reserved with the first cavity 13′. With the help of the filling block 4 provided in the first cavity 13′, part of the first cavity 13′ can be filled, thereby reducing the space required to inflate the first cavity 13′. Even if the second convex wall 12′ is damaged, the external air supply mechanism only needs a smaller amount of air to determine whether the first cavity 13′ and the second cavity 14′ are in air contact, thereby improving the efficiency of air tightness detection of the product to be tested.

[0023] Specifically, see Figure 5 In this embodiment, an air inlet channel 23 is provided within the fixture base plate 2. The outlet end of the air inlet channel 23 is connected to the air inlet port 22, and the air inlet end of the air inlet channel 23 is connected to an external air supply mechanism. Since there are two first cavities 13' of the product 1' to be tested, there are correspondingly two filling blocks 4. A section 20 for the connecting channel 10' to abut against is left between the two filling blocks 4 on the base plate 2. An air inlet channel 23 is provided within the base plate 2, and the outlet end of the air inlet channel 23 is connected to the air inlet port 22. The air inlet port 22 is located in the center of the section 20. The air inlet end of the air inlet channel 23 is connected to an external air supply mechanism. In this way, the external air supply mechanism enters the connecting channel 10' through the air inlet channel 23 and the air inlet port 22, and then enters the second cavity 14' for air tightness testing.

[0024] In order to save costs, the positioning members and the pressing members of this embodiment are manually operated and pressed. For example, two positioning mechanisms 5 for positioning the product to be tested 1′ are provided on the base plate 2. The two positioning mechanisms 5 are diagonally arranged. The positioning mechanisms 5 include positioning columns 51 for pre-positioning the product to be tested 1′ and a pressing plate 52 for pressing the product to be tested 1′. The positioning columns 51 can pass through the positioning holes 15′ of the product to be tested 1′ to pre-position the product to be tested 1′. The pressing plate 52 can pass through the positioning columns 51 to press the product to be tested 1′. The diagonally arranged positioning columns 51 can pre-position the product to be tested 1′ on the base plate 2 first, and the pressing plate 52 presses on the product to be tested 1′ passing through the positioning columns 51, thereby preventing the product to be tested 1′ from moving upward and falling off from the base plate 2, thereby completing the positioning of the product to be tested 1′. In addition, the base plate 2 of this embodiment is provided with four fasteners 6, such as bolts. Two of these fasteners 6 can pass through and lock into the remaining positioning holes 15' of the product 1' to be tested, thereby positioning the product 1' to be tested. The remaining two fasteners 6 can pass through and tighten the pressure plate 52, thereby enabling the positioning mechanism 5 to position the product 1' to be tested. Finally, the base plate 2 is provided with two handles 7 with an inverted "U" cross-section to facilitate user handling of the clamp.

[0025] The workflow of this embodiment is:

[0026] A. First, place the product 1′ to be tested on the base plate 2, so that the sealing ring 3 can abut the outer periphery of the first convex wall 11′. The filling blocks 4 are respectively filled into the corresponding first cavities 13′, leaving gaps 10 between the first cavities 13′ and the first convex wall 12′. The gaps 10 and the second cavities 14′ are separated into two independent spaces by the second convex wall 12′. Then, the positioning posts 51 are passed through the corresponding positioning holes 15′ to complete the pre-positioning of the product 1′ to be tested.

[0027] B. Then pass the pressing plate 52 through the positioning column 51 to press the product 1' to be tested;

[0028] C. Then, pass the four fasteners 6 through the remaining two positioning holes 15' and the two pressing plates 52, so that the pressing plates 52 press the product 1' to be tested, thereby completing the pressing of the product 1' to be tested;

[0029] D. Finally, the external air supply mechanism is connected to the air inlet channel 23, and the gas flows into the second cavity 14' from the air inlet 22 through the air inlet channel 23, and the second cavity 14' is supplied with air, so as to determine whether the second convex wall 12' is intact. If the second convex wall 12' is damaged, the first cavity 13' and the second cavity 14' will experience air cross-talk, and the measured value will exceed the preset value, so it can be determined that the air tightness test of the first cavity 13' and the second cavity 14' has failed. If the second convex wall 12' is not damaged, the first cavity 13' and the second cavity 14' will not experience air cross-talk, and the measured value is the preset value, so it can be determined that the air tightness test of the first cavity 13' and the second cavity 14' has passed.

Claims

1. A fixture for detecting the air tightness of a product, comprising a base plate (2) for placing a product (1′) to be tested, a sealing ring (3) and a filling block (4) being provided on the base plate (2), a cavity to be tested of the product (1′) to be tested comprising a first cavity (13′) and a second cavity (14′) located outside the first cavity (13′), and sharing a second annular convex wall (12′), wherein the first cavity (13′) is larger than the second cavity (14′); Its characteristics are: The bottom plate (2) is provided with a groove (21) for embedding the sealing ring (3) at a position corresponding to the second cavity (14'); the filling block (4) is filled in the first cavity (13') and a gap (10) is reserved between the first cavity (13'); the annular second convex wall (12') separates the gap and the second cavity (14') into two independent spaces; the bottom plate (2) is provided with an air inlet (22) corresponding to the second cavity (14'); when the external air supply mechanism only supplies air to the second cavity (14'), the air tightness of the first cavity (13') can be determined with the help of the annular second convex wall (12').

2. The clamp according to claim 1, characterized in that: An air inlet channel (23) is provided in the bottom plate (2), an air outlet end of the air inlet channel (23) is communicated with the air inlet (22), and an air inlet end of the air inlet channel (23) is communicated with an external air supply mechanism.

3. The clamp according to claim 2, characterized in that: There are two first cavities (13') in the product to be tested (1'), and the first cavities are arranged side by side at intervals. A connecting channel (10') communicating with the second cavity (14') is left between the two first cavities (13'). Correspondingly, two filling blocks (4) are also provided. A section (20) for the connecting channel (10') to abut against is left between the two filling blocks (4) on the bottom plate. The air inlet (22) is arranged at the center of the section (20). An external air supply mechanism enters the connecting channel (10') through the air inlet (22) through the air inlet channel (23) and then enters the second cavity (14').

4. The clamp according to any one of claims 1 to 3, characterized in that: The bottom plate (2) is provided with a positioning portion for positioning the product to be tested (1') and a pressing portion for pressing the product to be tested (1').

5. The clamp according to claim 4, characterized in that: A handle (7) for easy lifting is provided on the periphery of the bottom plate (2), and the cross section of the handle (7) is in an inverted "U" shape.

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