Clamp for detecting air tightness of product

Abstract

The utility model discloses a gas detection fixture for detecting the gas tightness of a product. The gas detection fixture comprises a lower fixture, an object to be detected, an upper fixture and a gas inlet mechanism, the to-be-detected object comprises a to-be-detected cavity, the cavity comprises a first cavity and a second cavity located in the first cavity, and a sealing area on the periphery of the second cavity is smaller than a sealing area on the periphery of the first cavity; the sealing structure is characterized in that a first sealing piece corresponding to a sealing area on the periphery of the first cavity is arranged on the upper surface of the lower clamp, a sealing seat is arranged on the periphery of the second cavity, the sealing seat is provided with a convex edge, a second sealing piece corresponding to the sealing area can be arranged on the convex edge in a sleeved mode, and the convex edge is higher than the first sealing piece. The sealing seat is arranged on the periphery of the second cavity, and the convex edge capable of providing supporting strength for the second sealing element is arranged on the sealing seat, so that the second sealing element can be sealed to the periphery of the cavity of the object to be inspected with better supporting strength.

Description

Technical Field

[0001] The utility model relates to air tightness detection equipment for products, in particular to a clamp used for detecting the air tightness of automobile parts. Background Art

[0002] In the production requirements of new energy auto parts, many parts have higher requirements for waterproofness or airtightness, and only products that meet the corresponding requirements can be shipped. The inspection of waterproofness or airtightness can be carried out by waterproofness or airtightness inspection devices. The detection principle of both is to use air to quickly and accurately check the leakage degree of the inspection 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. If the object to be inspected is Figure 1-2 The product shown has another problem. The product 1' includes a first cavity 2' and a second cavity 3' located in the first cavity 2', wherein the sealing area β of the periphery of the second cavity 3' is smaller than the sealing area α of the periphery of the first cavity 2', such as α=5β. Correspondingly, a sealing ring 4' for sealing each cavity and a groove 5' for embedding the sealing ring are provided on the lower fixture. The sealing ring 4' is generally selected to have a wider specification when it is set. However, if the periphery of the second cavity 3' has a deeper and narrower groove 5', if the upper fixture and the lower fixture are used to clamp the object to be inspected, the use of a wider sealing ring 4' is likely to result in poor sealing effect; if the height of the sealing ring corresponding to the second cavity 3' is set to the corresponding height, it is also easy to deform when being pressed by the upper fixture, which will eventually result in poor sealing effect. In summary, further improvements need to be made to the prior art. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a fixture for detecting the air tightness of products which can achieve a better sealing effect in view of the above-mentioned existing technical status, especially having a deeper and narrower groove for the sealing area of ​​the cavity to be tested.

[0005] The technical solution adopted by the utility model to solve the above technical problems is: the fixture for detecting the air tightness of the product includes:

[0006] A lower fixture is used to carry an object to be inspected, wherein the object to be inspected includes a cavity to be inspected, wherein the cavity includes a first cavity facing the lower fixture and a second cavity located in the first cavity, and a sealing area around the second cavity is smaller than a sealing area around the first cavity;

[0007] An upper clamp for clamping an object to be inspected; and

[0008] An air intake mechanism, arranged on the upper fixture and / or the lower fixture, for supplying air to each cavity of the object to be inspected;

[0009] Features:

[0010] The upper surface of the lower fixture is provided with a first sealing member corresponding to the sealing area of ​​the first cavity periphery, and a sealing seat is provided corresponding to the second cavity periphery, the sealing seat has a convex edge for the second sealing member corresponding to the sealing area to be sleeved thereon, and the height of the convex edge is higher than the height of the first sealing member;

[0011] When the second sealing member on the convex edge extends into and seals the periphery of the second cavity of the object to be inspected, the second cavity can form an independent closed space relative to the first cavity.

[0012] In order to detect the sealing condition of each cavity in the object to be inspected, from the perspective of structural implementation, the air intake mechanism includes a valve to form a passage communicating with each cavity; and

[0013] The air supply pipeline connects the valve and the air compressor to guide the air to the passage. After the object to be inspected is clamped, the cavities to be inspected are connected one by one through the pressure sensors of the corresponding inspection modules, and the pressure data detected by the pressure sensors are output. The leakage degree of each inspection position is determined by the change of the pressure data.

[0014] In order to detect the air tightness of the first cavity, further, the air intake mechanism also includes an air intake hole for supplying air to the first cavity. The first cavity is inflated through the air intake hole, and the air tightness of the first cavity is determined by detecting the change in pressure data through a pressure sensor. Furthermore, the cavity to be inspected of the object to be inspected also includes a third cavity located on the upper surface, and the third cavity faces the upper fixture. Correspondingly, the upper fixture is provided with a blocking portion that can block the opening of the third cavity. In this way, in addition to detecting the first cavity and the second cavity facing the lower fixture, this detection fixture can also detect the third cavity facing the upper fixture.

[0015] Furthermore, the lower clamp is also connected with a lateral blocking piece for blocking the lateral openings in the inspection object, the lateral openings include a second lateral opening corresponding to the second cavity and a third lateral opening corresponding to the third cavity, each of the lateral blocking pieces is connected to its own connecting rod mechanism, and a wrench is connected to the end of the connecting rod mechanism. When in use, by pulling the wrench, the lateral blocking piece can be driven by the connecting rod mechanism to move toward the first lateral opening and the second lateral opening of the object to be inspected, and complete the sealing and blocking.

[0016] In order to place the object to be inspected on the lower fixture at a preset position, further, a limiting device capable of limiting the position of the object to be inspected is provided on the lower fixture.

[0017] In order to place the sealing seat that is processed independently of the lower fixture, preferably, the lower fixture is provided with a shelf groove for the sealing seat to be placed. Since the convex edge of the sealing seat needs to be processed independently, it is more efficient to produce it separately from the lower fixture, and specific processing can be performed according to different second cavities.

[0018] Compared with the prior art, the advantages of the present invention are: a sealing seat is provided for the periphery of the second cavity, and a convex edge is provided on the sealing seat to provide supporting strength for the second seal, so that the second seal can seal to the periphery of the cavity of the object to be inspected with better supporting force, and when the second cavity can form an independent enclosed space relative to the first cavity, it cooperates with the air intake mechanism to clamp and seal each cavity of the product one by one, and then ventilate it to perform air tightness detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the object to be inspected in the background technology;

[0020] Figure 2 It is a schematic diagram of the structure of the sealing area α and the sealing area β in the background technology;

[0021] Figure 3 It is a schematic diagram of the structure of the fixture used for detecting the air tightness of the product in the utility model;

[0022] Figure 4 for Figure 3 A schematic diagram of a structure without the object to be inspected;

[0023] Figure 5 It is a schematic diagram of the structure of the object to be inspected in the utility model;

[0024] Figure 6 for Figure 5 Schematic diagram of the structure in another direction;

[0025] Figure 7 It is an exploded view of the lower clamp of the utility model;

[0026] Figure 8 for Figure 7 Exploded view from another direction;

[0027] Fig. 9 It is a structural schematic diagram of the lower clamp of the utility model;

[0028] Fig.10 for Fig. 9Sectional view at point A;

[0029] Fig.11 It is a schematic diagram of the structure of the first sealing member and the second sealing member in the utility model. DETAILED DESCRIPTION

[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0031] like Figure 3-11 The figure shows the best embodiment of the utility model. The fixture for detecting the air tightness of the product of this embodiment includes a lower fixture 1 for carrying the object 2 to be inspected, an upper fixture 3 for pressing the object 2 to be inspected, and an air intake mechanism 4 arranged on the upper fixture 3 and / or the lower fixture 1 for supplying air to each cavity of the object 2 to be inspected. The object 2 to be inspected includes three cavities to be inspected, namely, a first cavity 21 facing the lower fixture 1, a second cavity 22 located in the first cavity 21, and a third cavity 27 located on the upper surface of the object 2 to be inspected and facing the upper fixture 3. The sealing area around the second cavity 22 is smaller than the sealing area around the first cavity 21. The upper surface of the lower fixture 1 is provided with a first sealing member 23 corresponding to the sealing area of ​​the first cavity 21 and a sealing seat 24 corresponding to the periphery of the second cavity 22. The sealing seat 24 has a convex edge 26, which is used to sleeve the second sealing member 25 corresponding to the sealing area, and the convex edge 26 can provide the second sealing member 25 with supporting strength, so that the second sealing member 25 can be sealed to the periphery of the cavity of the object to be inspected 2 with better supporting strength. The height of the convex edge 26 is higher than the height of the first sealing member 23 (refer to Figure 10-11 ). When the second sealing member 25 on the flange 26 extends into and seals the periphery of the second cavity 22 of the object 2 to be inspected, the second cavity 22 can form an independent closed space relative to the first cavity 21. For the third cavity 27, the upper fixture 3 is provided with a sealing portion 31 that can seal the opening of the third cavity 27, so that an independent sealing area is formed, and the third cavity 27 can be inspected.

[0032] In order to detect the sealing condition of each cavity in the object to be inspected 2, the air intake mechanism 4 includes an air intake hole 43 for supplying air to the first cavity 21, a valve 41 for forming a passage communicating with each cavity, and an air supply pipeline 42 for connecting the valve 41 and the air compressor to guide the air to the passage. After the object to be inspected 2 is clamped, the cavities to be inspected are connected one by one through the pressure sensors of their corresponding inspection modules, and the pressure data detected by the pressure sensor is output, and the leakage degree of each inspection position is determined by the change of its pressure data.

[0033] The lower fixture 1 is also connected with a lateral blocking piece for blocking the lateral openings in the object to be inspected 2, and the lateral openings include a second lateral opening 28 corresponding to the second cavity 22 and a third lateral opening 29 corresponding to the third cavity 27. Each lateral blocking piece is connected to its own connecting rod mechanism 5, and a wrench 51 is connected to the end of the connecting rod mechanism 5. When in use, by pulling the wrench 51, the lateral blocking piece can be driven by the connecting rod mechanism 5 to move toward the first lateral opening and the second lateral opening 28 of the inspection object, and complete the sealing and blocking.

[0034] In addition, in order to place the object 2 to be inspected on the lower fixture 1 at a preset position, the lower fixture 1 is also provided with a limiting device 11 capable of limiting the position of the object 2 to be inspected. In order to place the sealing seat 24 processed independently of the lower fixture 1, the lower fixture 1 is provided with a resting groove 12 (refer to Figure 8 Since the convex edge 26 of the sealing seat 24 needs to be processed independently, it is more efficient to produce it separately from the lower fixture 1 in a mold, and specific processing can be performed according to different second cavities 22.

[0035] In summary, the detection steps of the fixture used to detect the air tightness of the product are as follows:

[0036] a. Detection of the first cavity 21:

[0037] The first cavity 21 faces the lower fixture 1, and the upper surface of the lower fixture 1 is provided with a first sealing member 23 corresponding to the sealing area of ​​the periphery of the first cavity 21. After the first cavity 21 is clamped, the first cavity is inflated through the air inlet 43, and the air tightness of the first cavity 21 is determined by detecting the change of pressure data through the pressure sensor;

[0038] b. Detection of the second cavity 22:

[0039] The second cavity 22 faces the lower fixture 1 and is located inside the first cavity 21. A sealing seat 24 is provided on the upper surface of the lower fixture 1 corresponding to the periphery of the second cavity 22. The sealing seat 24 has a convex edge 26 for the second sealing member 25 corresponding to the sealing area to be sleeved thereon. The height of the convex edge 26 is higher than that of the first sealing member 23. When the second sealing member 25 on the convex edge 26 extends into and seals the periphery of the second cavity 22, the second cavity 22 can form an independent closed space relative to the first cavity 21. Cooperate with the air intake mechanism 4 and ventilate the second cavity 22 after clamping and sealing it, and then test the air tightness;

[0040] c. Detection of the third cavity 27:

[0041] The third cavity 27 is located on the upper surface of the object 2 to be inspected, facing the upper fixture 3, and the upper fixture 3 is provided with a blocking portion 31 that can block the opening of the third cavity 27. The third cavity 27 is clamped and blocked by the air intake mechanism 4, and then ventilated to perform airtightness detection.

Claims

1. A fixture for detecting the air tightness of a product, comprising: A lower fixture (1) is used to carry an object (2) to be inspected, wherein the object (2) to be inspected comprises a cavity to be inspected, wherein the cavity comprises a first cavity (21) facing the lower fixture (1) and a second cavity (22) located in the first cavity (21), wherein a sealing area around the periphery of the second cavity (22) is smaller than a sealing area around the periphery of the first cavity (21); An upper clamp (3) for pressing the object to be inspected (2); and An air intake mechanism (4) is arranged on the upper fixture (3) and / or the lower fixture (1) and is used to supply air to each cavity of the object to be inspected (2); Features: The upper surface of the lower clamp (1) is provided with a first sealing member (23) in a sealing area corresponding to the periphery of the first cavity (21), and a sealing seat (24) is provided corresponding to the periphery of the second cavity (22), the sealing seat (24) having a convex edge (26) for a second sealing member (25) corresponding to the sealing area to be sleeved thereon, the height of the convex edge (26) being higher than the height of the first sealing member (23); When the second sealing member (25) on the convex edge (26) extends into and seals the periphery of the second cavity (22) of the object to be inspected (2), the second cavity (22) can form an independent closed space relative to the first cavity (21).

2. The fixture for detecting air tightness of a product according to claim 1, characterized in that: The air intake mechanism (4) includes a valve (41) to form a passage communicating with each of the cavities; and An air supply line (42) connects the valve (41) and an air compressor to guide air to the passage.

3. The fixture for detecting air tightness of a product according to claim 2, characterized in that: The air intake mechanism (4) also includes an air intake hole (43) for supplying air to the first cavity (21).

4. The fixture for detecting air tightness of a product according to any one of claims 1 to 3, characterized in that: The cavity to be inspected of the object to be inspected (2) also includes a third cavity (27) located on the upper surface, and the third cavity (27) faces the upper fixture (3). Correspondingly, the upper fixture (3) is provided with a sealing portion (31) capable of sealing the opening of the third cavity (27).

5. The fixture for detecting air tightness of a product according to claim 4, characterized in that: The lower clamp (1) is also connected to a lateral blocking piece for blocking a lateral opening in the object to be inspected (2), wherein the lateral opening includes a second lateral opening (28) corresponding to the second cavity (22) and a third lateral opening (29) corresponding to the third cavity (27), and each of the lateral blocking pieces is connected to its own connecting rod mechanism (5), and a wrench (51) is connected to the end of the connecting rod mechanism (5).

6. The fixture for detecting air tightness of a product according to claim 5, characterized in that: The lower clamp (1) is also provided with a limiting device (11) capable of limiting the position of the object (2) to be inspected.

7. The fixture for detecting air tightness of a product according to any one of claims 1 to 3, characterized in that: The lower clamp (1) is provided with a resting groove (12) for the sealing seat (24) to rest on.

Images