Box air tightness testing fixture

Abstract

The utility model relates to the technical field of air tightness detection, in particular to a box body air tightness detection tool. The box air tightness testing fixture comprises a detection table, an elastic sealing frame, a filling block, an air pump, an air tightness detector, a first pressing block, a second pressing block, a sealing plate, a first mounting seat and a protective rod. The sealing frame is arranged on the detection table, and a filling block is arranged in the sealing frame. The air pump and the air tightness detector are connected to a first air hole in the detection table, and the first pressing block and the second pressing block press the edge of the box body. The sealing plate is pressed on the side face of the box body. The protection rod is arranged on the top of the box body. During detection, the air pump inflates air into the box body from the first air hole, and the air tightness detector detects the air pressure in the box body. When the air pressure in the box body reaches the test pressure, the air pump stops working; maintaining the pressure of the box body for a period of time; and the air tightness detector monitors the pressure drop in the box body at any time to judge the air tightness quality.

Description

Technical Field

[0001] The utility model relates to the technical field of air tightness detection, in particular to an air tightness detection tool for a box. Background Art

[0002] During the driving process of electric vehicles, the battery pack will be subjected to vibration and impact loads. To ensure high voltage safety and reliable connection of the battery pack, the various modules and components of the battery pack must be firmly installed in the battery pack box. The battery pack box includes a lower box and a cover for closing the lower box. The lower box of the battery box is mainly used to carry and protect the battery pack. In order to ensure that the battery pack can supply power safely, the battery box must have strong dust and water resistance to prevent dust and water from entering the battery and causing a short circuit, affecting the normal driving of the car, and even threatening the personal safety of the driver and passengers. Therefore, the air tightness of the battery pack box, especially the air tightness of the lower box of the battery pack, is particularly important.

[0003] Some methods on the market to detect the air tightness of battery boxes are to inflate the battery box and then put it into a water tank. If bubbles are generated in the water tank, it is considered that the box is leaking. The probability of defective products in production is generally low. Each product is placed in a water tank for testing, and the detection efficiency is very low, which is not conducive to large-scale testing.

[0004] For example, Chinese patent application number: CN202221420044.6 discloses a battery pack lower box air tightness inspection tool, which is used to detect the air tightness of the battery pack lower box, and is characterized by: including a support frame, a detection water tank fixedly connected to the upper end of the support frame, a detection table for placing the lower box disposed in the detection water tank, a sealing component disposed on the detection table for closing the mouth of the lower box, a pressing component for pressing the lower box on the detection table, and an inflation device for inflating air into the lower box. This design is to inflate the box and then put it into the water tank for testing. This detection efficiency is very low and is not conducive to large-scale testing. Utility Model Content

[0005] In view of this, the utility model aims at the deficiencies of the prior art, and its main purpose is to provide a box air tightness inspection tool, which has high inspection efficiency and is conducive to large-scale inspection, thereby overcoming the deficiencies of the prior art.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The present application provides a box air tightness inspection tool, comprising a testing platform and a sealing frame; the elastic sealing frame is arranged on the testing platform; a filling block is arranged inside the sealing frame, and a gap is left between the filling block and the box; the testing platform is provided with a first air hole, and the first air hole is located on the inner side of the sealing frame; an air pump and an air tightness detector are connected to the first air hole;

[0008] A plurality of first pressing blocks and second pressing blocks are arranged around the outer periphery of the sealing frame, the output end of the first driving source is connected to the first pressing block; the output end of the second driving source is connected to the second pressing block, and the first pressing block and the second pressing block can press the edge of the box body on the sealing frame;

[0009] A sealing plate is arranged outside a frame of the sealing frame, an output end of the third driving source is connected to the sealing plate, and the sealing plate can push the box body;

[0010] An openable and closable first mounting seat is arranged on the periphery of the sealing frame, and a protective rod is arranged on the first mounting seat.

[0011] Preferably, a three-way solenoid valve is provided on the first air hole, and an air pump and an air tightness detector are connected to the three-way solenoid valve.

[0012] Preferably, the first mounting seat includes a base and a limit block hinged to the top of the base; a limit opening is provided on the top of the base, the end of the protective rod is passed through the limit opening, and the limit block can block the end of the protective rod.

[0013] Preferably, the first driving source is a rotating cylinder, and the second driving source is a fixed cylinder.

[0014] Preferably, the sealing frame is an accessory made of elastic plastic or elastic rubber.

[0015] Preferably, the cross section of the sealing frame is step-shaped.

[0016] Preferably, the first pressing block, the second pressing block and the sealing plate are all provided with flexible pads.

[0017] Preferably, a spray gun is provided on the detection platform, and the spray gun can spray out the detection liquid.

[0018] Preferably, the detection platform is arranged on a frame, and a water receiving tank for receiving the detection liquid is arranged at the bottom of the frame.

[0019] Preferably, a second air hole is further provided on the inner side of the sealing frame, and an exhaust solenoid valve is provided on the second air hole.

[0020] Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, it can be known from the above technical scheme that the box air tightness inspection tool comprises a testing platform, an elastic sealing frame, a filling block, an air pump, an air tightness tester, a first clamping block, a second clamping block, a sealing plate, a first mounting seat, and a protective rod. The sealing frame is arranged on the testing platform. A filling block is arranged inside the sealing frame to reduce the amount of inflation. The air pump and the air tightness tester are connected to the first air hole on the testing platform. The box is placed on the sealing frame, and the first clamping block and the second clamping block are pressed against the edge of the box. The sealing plate arranged on the outside of the sealing frame is pressed against the box to block the side opening of the box. The protective rod on the first mounting seat can limit the deformation of the box and improve the detection safety at the same time.

[0021] During the test, the air pump fills the box with gas from the first air hole, and the air tightness tester tests the air pressure in the box. When the air pressure in the box reaches the test pressure, the air pump stops working; then the box is kept under pressure for a period of time; the air tightness tester constantly monitors the pressure drop in the box. If the pressure drop in the box is within the design range, it is considered that the sealing is good, otherwise it is considered that the box is leaking. The box air tightness tester does not need to rely on a water tank for testing, has higher testing efficiency, and is more suitable for large-scale one-by-one testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a partial structural schematic diagram of an embodiment of the utility model.

[0023] Figure 2 It is a schematic diagram of the detection state of an embodiment of the utility model.

[0024] Figure 3 It is a schematic diagram of a sealing frame of an embodiment of the utility model.

[0025] Figure 4 It is a schematic diagram of the overall structure of an embodiment of the utility model.

[0026] Figure 5 It is a schematic diagram of the box structure of an embodiment of the utility model.

[0027] Description of the accompanying drawings:

[0028] 10. Testing table; 11. First air hole; 12. Sealing frame; 13. Filling block; 14. Rack; 15. Air tightness tester; 110. First driving source; 111. First pressing block; 112. Second driving source; 113. Second pressing block; 114. Flexible pad; 20. First mounting seat; 21. Base; 22. Protective rod; 23. Limiting block; 30. Box. DETAILED DESCRIPTION

[0029] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0030] Please refer to Figures 1 to 5 As shown, it shows the specific structure of the preferred embodiment of the utility model, which is a box air tightness inspection tool.

[0031] The air pump 16 fills the box 30 with gas from the first air hole 11, and the air tightness detector 15 detects the air pressure in the box 30. The air tightness detector 15 constantly monitors the pressure drop in the box 30. If the pressure drop in the box 30 is within the design range, it is considered that the sealing is good, otherwise it is considered that the box 30 is leaking. The box air tightness inspection tool does not need to rely on a water tank for inspection, and its inspection efficiency is higher, and it is more suitable for large-scale inspection one by one.

[0032] The present application provides a box air tightness inspection tool, including a test bench 10 and a sealing frame 12; the elastic sealing frame 12 is arranged on the test bench 10; a filling block 13 is arranged inside the sealing frame 12, and a gap is left between the filling block 13 and the box 30; the test bench 10 is provided with a first air hole 11, and the first air hole 11 is located on the inner side of the sealing frame 12; an air pump 16 and an air tightness detector 15 are connected to the first air hole 11. The test bench 10 is made of a metal sheet, which has good strength and sealing. The filling block 13 is preferably an immutable plastic, and the filling block 13 can reduce the inflation amount in the box 30 and improve work efficiency. A gap is left between the filling block 13 and the inner top wall, inner front wall, inner rear wall, and inner right arm of the box 30 to facilitate gas flow. The first air hole 11 is preferably formed by drilling, and the sealing frame 12 is pasted on the test bench 10. The three-way solenoid valve is preferably fixed to the first air hole 11 by a flange. Of course, the three-way solenoid valve can also be fixed to the first air hole 11 by a threaded connection. The air pump 16 can evacuate or pump air into the box 30. The air pump 16 and the air tightness detector 15 are connected to the three-way solenoid valve through a pipeline. The air tightness detector 15 is electrically connected to the air pump 16, and the air pump 16 and the air tightness detector 15 work in coordination, with a high degree of coordination, which is more conducive to testing.

[0033] Among them, the sealing tester is also called the airtightness detector 15. The airtightness detector 15 can realize the detection of products with reserved detection ports, semi-finished product detection, fully sealed product detection, and finished product detection without reserved detection ports. It mainly uses dry compressed air as the medium. In the semi-automatic or fully automatic leakage detection process, the product under test is inflated and pressurized (or negative pressure) to determine whether the inflated gas leaks. By calculating the pressure change of the product under test, the quality of the product under test on the production line can be determined.

[0034] A plurality of first pressing blocks 111 and second pressing blocks 113 are arranged around the outer periphery of the sealing frame 12, and the output end of the first driving source 110 is connected to the first pressing block 111; the output end of the second driving source 112 is connected to the second pressing block 113, and the first pressing block 111 and the second pressing block 113 can press the edge of the box body 30 on the sealing frame 12; a sealing plate 116 is arranged on the outer side of a frame of the sealing frame 12, and the output end of the third driving source 115 is connected to the sealing plate 116, and the sealing plate 116 can push the box body 30. The first driving source 110, the second driving source 112, and the third driving source 115 are preferably cylinders, and more specifically, the first driving source 110 is a rotating cylinder, and the second driving source 112 and the third driving source 115 are fixed cylinders. When the box 30 is placed on the sealing frame 12, the first driving source 110 drives the first pressing block 111 to rotate and press on the edge of the box 30, the second driving source 112 drives the second pressing block 113 to press on the edge of the box 30, and the third driving source 115 drives the sealing plate 116 to move toward the box 30, so that the side opening of the box 30 is blocked. In this way, the entire box 30 is sealed, and the next step of inflation can be carried out.

[0035] The outer periphery of the sealing frame 12 is provided with a first mounting seat 20 which can be opened and closed, and the first mounting seat 20 is provided with a protection rod 22. The protection rod 22 can limit the deformation of the top of the box body 30, and can also prevent flying pieces caused by the rupture of the box body 30, thereby improving the test safety.

[0036] Preferred test steps: 1. The box 30 is placed on the sealing frame 12, the first pressing block 111 and the second pressing block 113 press the edge of the box 30, and the sealing plate 116 presses the side opening of the box 30, so that the entire box 30 is in a sealed state. 2. The protective rod 22 is passed through the first mounting seat 20, and the protective rod 22 limits the deformation of the box 30 and improves the safety of the test. 3. The air pump 16 fills the box 30 with gas from the first air hole 11, and the air tightness detector 15 detects the air pressure in the box 30. When the air pressure in the box 30 reaches the test pressure, the air pump 16 stops working. 4. The box 30 maintains pressure for a period of time; the air tightness detector 15 monitors the pressure drop in the box 30 at all times. If the pressure drop in the box 30 is within the design range, it is considered that the sealing is good, otherwise it is considered that the box 30 is leaking. It can be seen that this type of box air tightness inspection fixture does not need to rely on a water tank for inspection, has higher inspection efficiency, and is more suitable for large-scale one-by-one inspection.

[0037] Preferably, the first mounting seat 20 includes a base 21, and a limit block 23 hinged on the top of the base 21; a limit opening 24 is provided on the top of the base 21, the end of the protective rod 22 is inserted into the limit opening 24, and the limit block 23 can block the end of the protective rod 22. The limit block 23 can rotate in the horizontal direction of the base 21. The limit block 23 rotates to expose the limit opening 24, and then the protective rod 22 is inserted into the limit opening 24, and then the limit block 23 is reset. This structure for fixing the protective rod 22 is simple and efficient, which is conducive to improving the detection efficiency.

[0038] Preferably, the sealing frame 12 is made of elastic plastic or elastic rubber. The cross section of the sealing frame 12 is stepped. The elasticity of the sealing frame 12 can improve the sealing performance. The stepped sealing frame 12 is improved in structure to prevent air leakage. In this embodiment, the sealing frame 12 has one step, which is higher on the inner side (thick on the inner side and slightly thinner on the outer side), so that the edge of the box body 30 can be completely blocked, and the sealing performance is very good.

[0039] Preferably, the first pressing block 111, the second pressing block 113, and the sealing plate 116 are all provided with a flexible pad 114. The flexible pad 114 is preferably made of elastic plastic or elastic rubber. The flexible pad 114 prevents the box body 30 from being crushed, thereby ensuring product quality.

[0040] Preferably, the test bench 10 is provided with a spray gun, which can spray out a test liquid. The test liquid is contained in a storage tank, which is connected to a pump through a pipeline, and the pump pumps the test liquid to the spray gun. When it is detected that the product is not qualified, the spray gun sprays the test liquid to the box 30, so that the specific leakage position of the product can be detected, so as to improve the production process. The test liquid can be water or soapy water.

[0041] Preferably, the test bench 10 is arranged on a frame 14, and a water receiving trough for receiving the test liquid is arranged at the bottom of the frame 14. Rollers are arranged at the bottom of the frame 14 to facilitate the transfer of the box air tightness inspection tool. The water receiving trough is arranged on the frame 14, and the water receiving trough partially extends from the frame 14, so that the water receiving trough can receive the test liquid, so that the test liquid can be reused.

[0042] Preferably, a second air hole is further provided on the inner side of the sealing frame 12, and an exhaust solenoid valve is provided on the second air hole. The second air hole can be used for exhausting air, and when the exhaust solenoid valve is opened, the air inside the box body 30 is exhausted, so that the box body 30 is convenient to remove.

[0043] In summary, the design focus of the utility model is that the box air tightness inspection device uses an air tightness detector 15 to detect the air pressure in the box 30. The air tightness detector 15 determines whether there is a leak based on the pressure drop in the box 30. This detection efficiency is higher and more suitable for large-scale one-by-one detection.

[0044] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A box air tightness inspection tool, characterized by: It comprises a testing platform and a sealing frame; the elastic sealing frame is arranged on the testing platform; a filling block is arranged inside the sealing frame, and a gap is left between the filling block and the box body; the testing platform is provided with a first air hole, and the first air hole is located on the inner side of the sealing frame; an air pump and an air tightness detector are connected to the first air hole; A plurality of first pressing blocks and second pressing blocks are arranged around the outer periphery of the sealing frame, the output end of the first driving source is connected to the first pressing block; the output end of the second driving source is connected to the second pressing block, and the first pressing block and the second pressing block can press the edge of the box body on the sealing frame; A sealing plate is arranged outside a frame of the sealing frame, an output end of the third driving source is connected to the sealing plate, and the sealing plate can push the box body; An openable and closable first mounting seat is arranged on the periphery of the sealing frame, and a protective rod is arranged on the first mounting seat.

2. The box air tightness inspection tool according to claim 1, characterized in that: The first air hole is provided with a three-way solenoid valve, and an air pump and an air tightness detector are connected to the three-way solenoid valve.

3. The box air tightness inspection tool according to claim 1, characterized in that: The first mounting seat includes a base and a limit block hinged to the top of the base; a limit opening is provided on the top of the base, the end of the protective rod is passed through the limit opening, and the limit block can block the end of the protective rod.

4. The box air tightness inspection tool according to claim 1, characterized in that: The first driving source is a rotating cylinder, and the second driving source is a fixed cylinder.

5. The box air tightness inspection tool according to claim 1, characterized in that: The sealing frame is an accessory made of elastic plastic or elastic rubber.

6. The box air tightness inspection tool according to claim 1, characterized in that: The cross section of the sealing frame is in a step shape.

7. The box air tightness inspection tool according to claim 1, characterized in that: The first pressing block, the second pressing block and the sealing plate are all provided with flexible pads.

8. The box air tightness inspection tool according to claim 1, characterized in that: The detection platform is provided with a spray gun which can spray out the detection liquid.

9. A box air tightness inspection tool according to claim 8, characterized in that: The detection platform is arranged on a frame, and a water receiving tank for receiving the detection liquid is arranged at the bottom of the frame.

10. The box air tightness inspection tool according to claim 1, characterized in that: A second air hole is also arranged on the inner side of the sealing frame, and an exhaust solenoid valve is arranged on the second air hole.

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