An airtightness detection device and production line

Abstract

The utility model relates to a kind of air-tightness detection device and production line, including pedestal, test seat, test road component and product ejection road component;The device integrates air-tightness detection, product ejection and marking function in a compact station, simplifies production line layout, can effectively improve production efficiency;And is provided with two-way gas path structure, one of which is used for the detection of air-tightness, the other is used for the automatic ejection of product after detection is completed, the cooperation of gas path structure valve body can realize the isolation and switching of test gas path and ejection gas path, realize the automatic detection and ejection of product, not only reduce the labor intensity of staff, improve the efficiency and accuracy of detection, also avoid the damage to product in manual operation process, to ensure the final quality of product.

Description

Technical Field

[0001] This utility model relates to the field of testing device technology, and in particular to an airtightness testing device and production line. Background Technology

[0002] In the field of machinery manufacturing, especially for high-pressure die-cast aluminum alloy products involving critical components such as engines and braking systems, it is generally necessary to have functions for oil, water, or air passage. For example, the oil passages, cooling water passages, and gas passages of large truck engines and air brake systems all require strict sealing performance, and leakage or cross-leakage is not allowed. During the casting and machining process, these products may leak due to defects such as sand holes, porosity, and cracks, which can lead to functional failure or even safety accidents. Therefore, leak detection has become an indispensable part of the manufacturing process.

[0003] Common leak detection methods include airtightness testing (air testing) and water immersion testing (water testing). Air testing involves filling the workpiece with compressed gas and using sensors to detect pressure changes or leakage rates; water testing involves immersing the workpiece in water and observing for bubble formation. Air testing is widely used in mass production due to its advantages such as high efficiency, high automation, and immunity to human visual factors.

[0004] In the process of airtightness testing, in order to ensure the reliability of the seal between the workpiece and the testing fixture, an O-ring is required at the joint surface of the two. The O-ring must maintain a preset compression amount with the inner hole of the fixture to form an effective seal. It is this necessary compression amount that brings significant drawbacks in actual operation, especially in scenarios where materials are loaded and unloaded manually. This sealing structure requires the workpiece to overcome the elastic resistance of the O-ring during clamping to fully embed into the fixture, and similarly, it must overcome the frictional resistance between the O-ring and the workpiece surface during removal. Operators must repeat this clamping and removal action hundreds or even thousands of times daily, resulting in extremely high labor intensity. More importantly, during manual operation, operators are prone to uneven force application due to physical exertion and fatigue, or unnecessary shaking during workpiece handling. This can lead to excessive compression, deformation, scratches, or displacement of the O-ring, reducing sealing reliability and affecting the accuracy of test results. Furthermore, it may cause the workpiece to collide with the fixture, resulting in surface damage or expansion of internal defects, or even workpiece scrap, seriously affecting product quality consistency. It also increases the replacement frequency of the O-ring and production costs, posing numerous challenges to the company's production management. Utility Model Content

[0005] Therefore, the technical problem to be solved by this utility model is to overcome the problem that in the process of airtightness testing in the prior art, the operator has to overcome the elastic resistance of the O-ring to load and unload the workpiece, which is extremely labor-intensive. Moreover, the O-ring may be damaged when picking up and placing the workpiece, which will affect the accuracy of the test results. At the same time, it may also cause the workpiece to collide with the tooling, affecting the final quality of the product.

[0006] To solve the above-mentioned technical problems, this utility model provides an airtightness testing device, comprising, The base includes a bottom plate and a top plate. A plurality of support columns are vertically connected to the bottom plate. The end of each support column away from the bottom plate is vertically connected to the top plate, and a mounting plate is connected to the top plate. A test stand is mounted on a base plate and has a material trough and a pressure port connected to the material trough. The test circuit assembly includes a ball valve, a leak tester, and a three-way valve. The ball valve is connected to a mounting plate. The detection end of the leak tester is connected to the inlet end of the ball valve through a first pipeline. The outlet end of the ball valve is connected to the first valve port of the three-way valve through a second pipeline. The second valve port of the three-way valve is connected to the pressure port through a third pipeline. The product top outlet assembly includes a pressure regulating valve and a needle valve, which are respectively mounted on the mounting plate. The input end of the pressure regulating valve is connected to a compressed air source, and the output end of the pressure regulating valve is connected to the input end of the needle valve. The output end of the needle valve is connected to the third valve port of the three-way valve through a fourth pipeline.

[0007] In one embodiment of this utility model, an upper pressure assembly is included. The upper pressure assembly includes a first driving source, which is vertically connected to the top plate and coaxial with the test seat. The output end of the first driving source passes through the top plate and is vertically connected to a pressure block.

[0008] In one embodiment of this utility model, two mounting holes are vertically opened on the top plate, and a linear bearing is coaxially arranged in each of the two mounting holes. A sliding rod is slidably connected to each of the two linear bearings. A pressure plate is vertically connected between the ends of the two sliding rods near the bottom plate, and a pressure block is arranged on the side of the pressure plate facing the bottom plate.

[0009] In one embodiment of this utility model, a sealing element is provided on the side of the pressure block facing the test seat.

[0010] In one embodiment of this utility model, a marking assembly is included. The marking assembly includes a support plate, a sliding plate, a second driving source, a third driving source, and a marking head. Two support plates are provided, which are vertically connected to a base plate and parallel to each other. A slide rail is provided parallel to each other on the side of the two support plates away from the base plate. The sliding plate is slidably connected to the two slide rails by a slider and is parallel to the base plate. A test seat is provided near one end of the two support plates and located between the two support plates. The second driving source is vertically connected to the sliding plate and corresponds to the position of the test seat. The output end of the second driving source passes through the sliding plate and is coaxially connected to the marking head. The third driving source is connected to the base plate for driving the sliding plate to slide.

[0011] In one embodiment of the present invention, a buffer block is provided on the side of the sliding plate facing the base plate, and the buffer block is provided with a through hole for the marking head to pass through.

[0012] In one embodiment of this utility model, the buffer block is made of polyoxymethylene resin material.

[0013] In one embodiment of the present invention, the test seat includes a cylindrical body, a material groove coaxially formed at one end of the body, a central column coaxially formed at the bottom of the material groove, and a pressure port communicating with the material groove vertically formed on the side of the body. Meanwhile, an annular outer edge coaxially formed on the side of the body away from the material groove, and a plurality of bolt holes vertically formed on the annular outer edge and connected to the base plate by bolts.

[0014] In one embodiment of this utility model, an adapter is included, which is connected to the top plate. The adapter has an adapter hole. The detection end of the leakage tester is connected to one end of the adapter hole through a first pipeline. The other end of the adapter hole is connected to the inlet end of the ball valve through an adapter pipe.

[0015] A production line comprising an airtightness testing device as described in any of the preceding claims.

[0016] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art: The airtightness testing device described in this utility model integrates airtightness testing, product ejection, and marking functions into a compact workstation, simplifying the production line layout and effectively improving production efficiency. It features a dual-path air supply system, one path for airtightness testing and the other for automatic product ejection after testing. Through the coordination of valves in the air supply system, the testing and ejection air paths can be isolated and switched, enabling automatic product testing and ejection. This not only reduces the labor intensity of workers and improves testing efficiency and accuracy but also avoids damage to the product during manual operation, thus ensuring the final product quality. Attached Figure Description

[0017] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. Figure 1 This is a schematic diagram (first view) of the overall structure of the airtightness testing device according to a preferred embodiment of the present invention. Figure 2 This is a schematic diagram (second perspective) of the overall structure of the airtightness testing device according to a preferred embodiment of the present invention. Figure 3 This is a front view of the airtightness testing device according to a preferred embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the base of the airtightness testing device according to a preferred embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the test stand of the airtightness testing device according to a preferred embodiment of the present invention.

[0018] Instruction manual drawing reference numerals: 1. Base; 11. Bottom plate; 12. Top plate; 13. Support column; 14. Mounting plate; 2. Test seat; 21. Material tank; 22. Pressurization port; 23. Center column; 3. Test path assembly; 31. Ball valve; 32. Leakage tester; 33. Three-way valve; 34. First pipeline; 35. Second pipeline; 36. Third pipeline; 37. Adapter pipe; 38. Ball valve switch control air path; 4. Product top outlet assembly; 41. Pressure regulating valve; 42. Needle valve; 43. Air inlet pipeline; 44. Fourth pipeline; 5. Pressurization assembly; 51. First drive source; 52. Pressure block; 53. Seal; 54. Linear bearing; 55. Slide rod; 56. Pressure plate; 6. Marking assembly; 61. Support plate; 62. Sliding plate; 63. Second drive source; 64. Third drive source; 65. Buffer block; 7. Adapter seat. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0020] Example 1, refer to Figures 1-5 As shown, the present invention provides an airtightness testing device, comprising: The base 1 includes a bottom plate 11 and a top plate 12. Multiple support columns 13 are vertically connected to the bottom plate 11. The end of the support column 13 away from the bottom plate 11 is vertically connected to the top plate 12, and an mounting plate 14 is connected to the top plate 12. Test stand 2 is set on base plate 11. Test stand 2 has a material tank 21 and a pressure port 22 that connects to the material tank 21. Test circuit assembly 3 includes a ball valve 31, a leak tester 32, and a three-way valve 33. The ball valve 31 is connected to the mounting plate 14. The detection end of the leak tester 32 is connected to the inlet end of the ball valve 31 through the first pipeline 34. The outlet end of the ball valve 31 is connected to the first valve port of the three-way valve 33 through the second pipeline 35. The second valve port of the three-way valve 33 is connected to the pressure port 22 through the third pipeline 36. Product top outlet assembly 4 includes a pressure regulating valve 41 and a needle valve 42. The pressure regulating valve 41 and the needle valve 42 are respectively installed on the mounting plate 14. The input end of the pressure regulating valve 41 is connected to a compressed air source through the air inlet pipe 43. The output end of the pressure regulating valve 41 is connected to the input end of the needle valve 42. The output end of the needle valve 42 is connected to the third valve port of the three-way valve 33 through the fourth pipe 44.

[0021] This utility model discloses an airtightness testing device that integrates airtightness testing, product ejection, and marking functions into a compact workstation, simplifying the production line layout and effectively improving production efficiency. It features a dual-path air supply structure, one for airtightness testing and the other for automatic product ejection after testing. Through the coordination of valves in the air supply structure, the testing air supply and ejection air supply can be isolated and switched, enabling automatic product testing and ejection. This not only reduces the labor intensity of workers and improves testing efficiency and accuracy but also avoids damage to the product during manual operation, thus ensuring the final product quality.

[0022] Reference Figure 3As shown, further, it includes an upper pressing assembly 5, which includes a first driving source 51. The first driving source 51 is vertically connected to the top plate 12 and coaxial with the test seat 2. The output end of the first driving source 51 passes through the top plate 12 and is vertically connected to a pressure block 52. Specifically, the upper pressing assembly 5 is used to completely press the part to be tested into the test seat 2 and seal the upper end of the part. When the first driving source 51 is activated, it can drive the pressure block 52 to press down and completely press the product to be tested, which is manually placed on the test seat 2, into the test seat 2. The upper end surface of the product to be tested is sealed by the pressure block 52 and the sealing element 53 provided at its bottom.

[0023] Furthermore, two mounting holes are vertically formed on the top plate 12, and a linear bearing 54 is coaxially arranged in each of the two mounting holes. A slide rod 55 is slidably connected to each of the two linear bearings 54. A pressure plate 56 is vertically connected between the ends of the two slide rods 55 near the bottom plate 11. A pressure block 52 is provided on the side of the pressure plate 56 facing the bottom plate 11. When the first drive source 51 drives the pressure block 52 to move, the slide rod 55 can slide along the linear bearing 54, which guides the movement of the pressure plate 56 and the pressure block 52, preventing the pressure block 52 from shifting during movement and further ensuring the sealing effect.

[0024] Furthermore, a sealing element 53 is provided on the side of the pressure block 52 facing the test seat 2 to ensure the sealing performance of the pressure block 52 after pressing the product to be tested, prevent leakage of test gas, and ensure the accuracy of the test results. The sealing element 53 can be made of elastic materials such as rubber or silicone.

[0025] Furthermore, the system includes a marking assembly 6, which comprises a support plate 61, a sliding plate 62, a second drive source 63, a third drive source 64, and a marking head. Two support plates 61 are provided, vertically connected to the base plate 11 and parallel to each other. A slide rail is parallel to each other on the side of each support plate 61 away from the base plate 11. The sliding plate 62 is slidably connected to the two slide rails via a slider and is parallel to the base plate 11. The test seat 2 is located near one end of the two support plates 61 and between them. The second drive source 63 is vertically connected to the sliding plate 62 and corresponds to the position of the test seat 2. The output end of the second drive source 63 passes through the sliding plate 62 and is coaxially connected to the marking head. The third drive source 64 is connected to the base plate 11 to drive the sliding plate 62 to slide. Specifically, the marking assembly 6 is used to mark the tested products to identify qualified products, facilitating product traceability and classification in subsequent production processes. After the test is completed, the third drive source 64 drives the sliding plate 62 to slide towards the side closer to the test seat 2, so that the second drive source 63 on the sliding plate 62 moves to directly above the product under test. Then the second drive source 63 drives the marking head to squeeze the end face of the product for marking. After the marking is completed, the second drive source 63 and the third drive source 64 are reset.

[0026] Furthermore, a buffer block 65 is provided on the side of the sliding plate 62 facing the base plate 11, and the buffer block 65 has a through hole for the marking head to pass through. Specifically, the buffer block 65 is used to limit the test part after it is blown out of the test seat 2, preventing it from falling off the test seat 2 and causing damage. Moreover, the buffer block 65 is made of flexible material, which also prevents damage to the test part when it comes into contact with it, ensuring the final quality of the product.

[0027] Furthermore, the buffer block 65 is made of polyoxymethylene resin material, but is not limited to the above material. Different flexible materials can be selected according to actual needs.

[0028] Reference Figure 5 As shown, the test stand 2 further includes a cylindrical body with a material groove 21 coaxially formed at one end. A central column 23 is coaxially arranged at the bottom of the material groove 21. A pressure port 22 communicating with the material groove 21 is vertically formed on the side of the body. At the same time, an annular outer edge is coaxially formed on the side of the body away from the material groove 21. Multiple bolt holes are vertically formed on the annular outer edge and connected to the base plate 11 by bolts. Specifically, during the process of placing the product to be tested into the material groove 21, the central column 23 cooperates with the central hole at the bottom of the product to guide and position the product, ensuring that the product enters the material groove 21 in the correct position and posture. After the product under test is pressed into the material tank 21, the upper surface of the product under test is sealed by the pressure block 52 and the sealing element 53. Furthermore, the sealing ring fitted on the side of the product under test fits tightly with the inner wall of the material tank 21, forming a sealed test chamber between the product under test and the test holder 2. Pressurized gas is then introduced through the pressurization port 22, which communicates with this chamber, to test the airtightness of the test chamber. Specifically, the test holder 2 is connected to the base plate 11 by fasteners, making installation and disassembly convenient. Different sizes and specifications of test holders 2 can be used according to actual needs, which improves the versatility of the entire device and reduces costs.

[0029] Furthermore, an adapter 7 is included, which is connected to the top plate 12. The adapter 7 has an adapter hole. The detection end of the leak tester 32 is connected to one end of the adapter hole via a first pipe 34, and the other end of the adapter hole is connected to the inlet end of the ball valve 31 via an adapter pipe 37. It is conceivable that since the leak tester 32 is frequently used for testing at different workstations, it will undergo multiple disassembly and assembly. To avoid damage to the expensive ball valve 31 from repeated disassembly and assembly, an adapter 7 is provided on the base 1. After the leak tester 32 is connected to the adapter 7 via the first pipe 34, the adapter 7 is then connected to the ball valve 31 via the adapter pipe 37. This eliminates the need for frequent disassembly of the pipes connected to the ball valve 31, thereby preventing damage to the ball valve 31 and extending its service life. Specifically, the ball valve 31 is also connected to a ball valve switch control air circuit 38 for controlling its opening and closing, and the needle valve 42 is connected to a needle valve switch control air circuit for controlling its opening and closing.

[0030] Working principle: The manual places the part to be tested into the material tank 21 of the test seat 2 and presses the start button. The first drive source 51 drives the pressure block 52 to move downward. The pressure block 52 presses the part to be tested to overcome the resistance caused by the interference of the O-ring and presses it completely into the material tank 21. At the same time, the pressure block 52 seals the upper end face of the part through the sealing element 53 set on it (the O-ring will seal the side of the part). Next, the leak tester 32 starts inflation. At this time, the ball valve 31 (a Swagelok ball valve can be used) opens, the needle valve 42 closes, and the test gas passes sequentially through the first pipe 34, the adapter pipe 37, the ball valve 31, the second pipe 35, the three-way valve 33, and the third pipe 36 into the test cavity of the part in the test holder 2. After inflation, the leak tester 32 starts stabilizing the pressure, testing, and venting. During the venting process, since the ball valve 31 is bidirectional, the gas in the test part can be vented through the leak tester 32 along the above-mentioned gas path. After venting is completed, the first drive source 51 resets, and the third drive source 64 drives the sliding plate 62 to slide, causing the second drive source 63 to move to... Above the part being tested, the second drive source 63 is activated, marking the end face of the part with a marking head connected to its output end. After marking is completed, the second drive source 63 and the third drive source 64 are reset. Before the third drive source 64 is reset, the ball valve 31 is closed and the needle valve 42 is opened. Since the needle valve 42 is connected to an external compressed air source, the compressed air will enter the test cavity of the part through the pressure regulating valve 41, the needle valve 42, the fourth pipeline 44, the three-way valve 33 and the third pipeline 36 in sequence, blowing the part being tested and causing it to detach from the test seat 2. After the part is blown out, it will hit the buffer block 65 set at the bottom of the sliding plate 62, preventing the part from falling and also preventing the product from being damaged.

[0031] It is conceivable that when the product ejection assembly 4 is activated, the ball valve 31 is in the closed state, which can prevent gas backflow from damaging the leak tester 32. Additionally, the pressure of the pressure regulating valve 41 can be reduced according to the blowing situation of the product parts, so that the product is not blown out too violently. Similarly, when it is difficult to blow the product out, the gap between the central column 23 and the product parts can be reduced, and the blowing air pressure increased, so that the product can be ejected smoothly.

[0032] Example 2: This utility model also discloses a production line, including the airtightness testing device as in Example 1.

[0033] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An airtightness testing device, characterized in that: include, The base includes a bottom plate and a top plate. A plurality of support columns are vertically connected to the bottom plate. The end of each support column away from the bottom plate is vertically connected to the top plate, and a mounting plate is connected to the top plate. A test stand is mounted on a base plate and has a material trough and a pressure port connected to the material trough. The test circuit assembly includes a ball valve, a leak tester, and a three-way valve. The ball valve is connected to a mounting plate. The detection end of the leak tester is connected to the inlet end of the ball valve through a first pipeline. The outlet end of the ball valve is connected to the first valve port of the three-way valve through a second pipeline. The second valve port of the three-way valve is connected to the pressure port through a third pipeline. The product top outlet assembly includes a pressure regulating valve and a needle valve, which are respectively mounted on the mounting plate. The input end of the pressure regulating valve is connected to a compressed air source, and the output end of the pressure regulating valve is connected to the input end of the needle valve. The output end of the needle valve is connected to the third valve port of the three-way valve through a fourth pipeline.

2. The airtightness testing device according to claim 1, characterized in that: The device includes an upper pressure assembly, which includes a first drive source. The first drive source is vertically connected to the top plate and coaxial with the test seat. The output end of the first drive source passes through the top plate and is vertically connected to a pressure block.

3. The airtightness testing device according to claim 2, characterized in that: Two mounting holes are vertically formed on the top plate. A linear bearing is coaxially arranged in each of the two mounting holes. A sliding rod is slidably connected to each of the two linear bearings. A pressure plate is vertically connected between the ends of the two sliding rods near the bottom plate. A pressure block is provided on the side of the pressure plate facing the bottom plate.

4. The airtightness testing device according to claim 3, characterized in that: A sealing element is provided on the side of the pressure block facing the test seat.

5. The airtightness testing device according to claim 1, characterized in that: The system includes a marking assembly comprising a support plate, a sliding plate, a second drive source, a third drive source, and a marking head. Two support plates are provided, vertically connected to a base plate and parallel to each other. A slide rail is parallel to each other on the side of each support plate away from the base plate. The sliding plate is slidably connected to the two slide rails via a slider and is parallel to the base plate. A test seat is located near one end of the two support plates and between them. The second drive source is vertically connected to the sliding plate and corresponds to the position of the test seat. The output end of the second drive source passes through the sliding plate and is coaxially connected to the marking head. The third drive source is connected to the base plate to drive the sliding plate to slide.

6. The airtightness testing device according to claim 5, characterized in that: A buffer block is provided on the side of the sliding plate facing the base plate, and the buffer block is provided with a through hole for the marking head to pass through.

7. The airtightness testing device according to claim 6, characterized in that: The buffer block is made of polyoxymethylene resin.

8. The airtightness testing device according to claim 1, characterized in that: The test stand includes a cylindrical body, with a material trough coaxially formed at one end of the body. A central column is coaxially arranged at the bottom of the material trough, and a pressure port communicating with the material trough is vertically formed on the side of the body. Meanwhile, an annular outer edge is coaxially formed on the side of the body away from the material trough, and multiple bolt holes are vertically formed on the annular outer edge and connected to the base plate by bolts.

9. The airtightness testing device according to claim 1, characterized in that: The device includes an adapter base connected to the top plate. The adapter base has an adapter hole. The detection end of the leakage tester is connected to one end of the adapter hole through a first pipeline. The other end of the adapter hole is connected to the inlet end of the ball valve through an adapter pipe.

10. A production line, characterized in that: Includes the airtightness testing device as described in any one of claims 1-9.

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