Air tightness detection device and air tightness detection equipment

Abstract

The utility model belongs to the technical field of laser processing, and relates to an air tightness detection device and air tightness detection equipment. The air tightness detection device provided by the utility model comprises a test fixture, a plugging assembly and a pressing assembly. The test fixture comprises a fixture body, the fixture body is provided with a cavity used for accommodating a workpiece, an opening convenient for the workpiece to enter and exit is arranged above the cavity, a first sealing ring is arranged beside the opening, and the cavity is also provided with an interface connected with an external detection device. The plugging assembly comprises a first driving piece and a plugging piece, the first driving piece penetrates through the jig body, the first driving piece is in transmission connection with the plugging piece so as to drive the plugging piece to move in the cavity in the horizontal direction, and the plugging piece is used for plugging an air leakage opening of a workpiece in the cavity. The pressing assembly is arranged above the jig body and used for covering the opening of the cavity. The air tightness detection equipment provided by the utility model comprises the air tightness detection device. The air tightness detection of the welding position of the workpiece is facilitated.

Description

Technical Field

[0001] This application belongs to the field of laser processing technology, and more specifically, relates to an airtightness testing device and airtightness testing equipment. Background Technology

[0002] In modern industrial production, airtightness testing is a crucial step in ensuring product quality and safety, widely used in the automotive, electronics, and plastics industries. After laser welding of plastic products, the airtightness of the weld joint needs to be tested. However, the cavity formed after welding the plastic base and top cover often has gaps that leak air. Most airtightness testing instruments on the market can only test the airtightness of sealed cavities. For products with leaky gaps, a common testing method is to directly pressurize the gap with air, but because the leakage at the gap is very small, this method requires a long holding time, significantly reducing testing efficiency. Insufficient holding time may lead to inaccurate test results. Utility Model Content

[0003] This application provides an airtightness testing device and an airtightness testing equipment, which seals the air leakage gaps in the workpiece by sealing the sealing components to facilitate the airtightness testing of the welded joints of the workpiece.

[0004] The technical solution adopted in this application embodiment is: to provide an airtightness detection device, including:

[0005] A test fixture includes a fixture body, the fixture body having a cavity for accommodating a workpiece, the cavity having an opening above it for easy entry and exit of the workpiece, a first sealing ring being provided next to the opening, and the cavity also having an interface for connecting to an external testing device.

[0006] The sealing assembly includes a first driving member and a sealing member. The first driving member is inserted through the fixture body and is convexly connected to the sealing member to drive the sealing member to move horizontally within the cavity. The sealing member is used to seal the air leakage port of the workpiece within the cavity.

[0007] A pressing assembly is disposed above the fixture body and is used to cover the opening of the cavity so that the cavity forms a sealed detection cavity.

[0008] Optionally, the sealing member includes a sealing part and an elastic deformation part. The first driving workpiece is connected to the sealing part to drive the sealing part to be inserted into the air leakage port of the workpiece. The elastic deformation part covers the sealing part and is used to seal the gap between the air leakage port of the workpiece and the sealing part.

[0009] Optionally, the first driving component includes a first driving shaft, which is connected to the sealing component. The side wall of the fixture body is provided with a through hole for the first driving shaft to pass through, and the inner side wall of the through hole is provided with a second sealing ring.

[0010] Optionally, a third sealing ring is provided on the outer side wall of the first drive shaft, which can abut against the outside of the through hole to prevent air leakage at the through hole.

[0011] Optionally, a limiting groove is provided next to the opening, and the first sealing ring is engaged in the limiting groove.

[0012] Optionally, the test fixture further includes a second driving member, which is throttle-connected to the fixture body to drive the fixture body to move in the horizontal direction.

[0013] Optionally, the pressing assembly includes a support, a cover plate, and a lifting drive. The cover plate is used to cover the opening of the cavity and is disposed on the support. The lifting drive is connected to the support to drive the support to move the cover plate vertically towards or away from the opening of the fixture body.

[0014] Optionally, the support includes a left support member, a right support member, and a top plate. The left support member and the right support member are arranged opposite to each other and are respectively connected to the top plate. The cover plate is disposed on the top plate.

[0015] The lifting drive unit includes a left lifting drive part and a right lifting drive part. The left lifting drive part is connected to the left support member, and the right lifting drive part is connected to the right support member, so as to drive the top plate to move the cover plate in a vertical direction.

[0016] Optionally, the left or right support member is connected to a lifting guide member.

[0017] Optionally, a buffer is provided on the top plate.

[0018] This application also provides an airtightness testing device, including the airtightness testing apparatus described above.

[0019] The beneficial effects of the air tightness testing device and air tightness testing equipment provided in this application embodiment are as follows: After the test fixture of the air tightness testing device of this application embodiment is placed into the workpiece, the first driving component of the sealing component drives the sealing component to move horizontally in the cavity of the fixture body, so that the sealing component seals the air leakage port of the workpiece, and the pressing component above the fixture body covers the opening of the cavity, so that the cavity forms a sealed testing cavity. The external testing device connected to the cavity detects the air tightness of the workpiece weld by detecting the air tightness in the cavity, thereby improving the testing efficiency and testing accuracy.

[0020] The airtightness testing device of this application includes the airtightness testing apparatus described above, and therefore has the beneficial effects brought by the airtightness testing apparatus described above, which will not be repeated here. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional structural schematic diagram of the airtightness detection device provided in the embodiments of this application;

[0023] Figure 2 This is a three-dimensional structural diagram of the fixture body provided in the embodiments of this application;

[0024] Figure 3 This is a partial cross-sectional view of the fixture body provided in an embodiment of this application.

[0025] The following are the labeling elements in the figure:

[0026] 1. Test fixture; 11. Fixture body; 111. Cavity; 112. First sealing ring; 113. Interface; 114. Through hole; 115. Second sealing ring; 116. Limiting groove; 12. Second driving component;

[0027] 2. Sealing assembly; 21. First driving component; 211. First drive shaft; 212. Third sealing ring; 22. Sealing component; 221. Sealing part; 222. Elastic deformation part;

[0028] 3. Support; 31. Left support; 32. Top plate; 33. Right support;

[0029] 4. Cover plate;

[0030] 5. Lifting drive components;

[0031] 6. Lifting guide components. Detailed Implementation

[0032] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0033] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0034] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0036] Please see Figure 1 and Figure 2 The airtightness testing device provided in this application embodiment will now be described. The airtightness testing device provided in this application embodiment includes a test fixture 1, a sealing assembly 2, and a pressing assembly. The test fixture 1 includes a fixture body 11, on which a cavity 111 for accommodating a workpiece is provided. An opening is located above the cavity 111 to facilitate the entry and exit of the workpiece. A first sealing ring 112 is provided beside the opening. An interface 113 for connecting to an external testing device is also provided on the cavity 111. The sealing assembly 2 includes a first driving member 21 and a sealing member 22. The first driving member 21 passes through the fixture body 11 and is convexly connected to the sealing member 22 to drive the sealing member 22 to move horizontally within the cavity 111. The sealing member 22 is used to seal any air leakage from the workpiece within the cavity 111. The pressing assembly is located above the fixture body 11 and is used to cover the opening of the cavity 111, so that the cavity 111 forms a sealed testing chamber.

[0037] The fixture body 11 in this embodiment can be movable or fixedly disposed below the pressing assembly. The fixture body 11 is connected to an external testing device to perform air filling and airtightness testing on the cavity 111 of the fixture body 11. A first sealing ring 112 is provided at the edge of the opening to seal the cavity 111 when the pressing assembly is closed, thereby improving the accuracy of the test. The shape and size of the cavity 111 are designed according to the shape of the workpiece to be tested to ensure that the workpiece can be stably placed in the cavity 111.

[0038] Driven by the first driving component 21, the sealing component 22 can move horizontally within the cavity 111, thereby sealing the workpiece's air leakage port. The shape and size of the sealing component 22 are designed according to the shape of the workpiece's air leakage port to ensure the reliability and sealing performance of the sealing. The sealing component 22 can be made of elastic material to adapt to air leakage ports of different shapes and sizes and improve the sealing effect. The first driving component 21 can specifically be a motor, a cylinder, or a hydraulic cylinder.

[0039] The pressing assembly can be detachably connected to the fixture body 11, for example, by bolts or snap-fit ​​structures. A sealing structure that mates with the first sealing ring 112 is provided at the bottom edge of the pressing assembly to ensure a good seal when closed. The pressing assembly can be made of high-strength engineering plastics or metals to ensure its structural strength and durability.

[0040] Before conducting the airtightness test, the workpiece to be tested is first placed inside the cavity 111 of the test fixture 1. Driven by the first driving member 21, the sealing member 22 moves horizontally to the leakage gap of the workpiece, thus sealing the leakage. The sealing member 22 fits tightly against the leakage gap, effectively preventing gas from leaking out. The pressing assembly is then placed over the opening of the cavity 111, and the first sealing ring 112 at the opening cooperates with the pressing assembly to form a sealed test chamber. An external air source and a testing instrument are connected through the interface 113 on the cavity 111, and the test chamber is filled with air to a preset pressure value. After filling, the pressure change inside the test chamber is monitored by the testing instrument. If the pressure inside the test chamber remains stable for a certain period of time, it indicates that the weld joint of the workpiece has good airtightness; if the pressure drops, it indicates that there is a leak. After the test is completed, the sealing member 22 is removed by the first driving member 21, the pressing assembly is opened, the workpiece is removed, and the test process is completed.

[0041] This embodiment of the application seals the air leakage gap in the workpiece using the sealing component 2, avoiding the inefficient detection method of directly filling and pressurizing the gap, greatly shortening the detection time and improving detection efficiency. The sealing component 2 and the pressing component ensure the airtightness of the detection chamber, making the detection results more accurate and reliable. This device is suitable for various workpieces with air leakage gaps, especially welded plastic products, and effectively solves the limitations of traditional detection methods. The design of the sealing component 2 and the pressing component can be adjusted according to the shape and size of different workpieces, exhibiting strong versatility and flexibility.

[0042] Please see Figure 3 The sealing component 22 includes a sealing part 221 and an elastic deformation part 222. The first driving workpiece is connected to the sealing part 221 to drive the sealing part 221 to be inserted into the air leakage port of the workpiece. The elastic deformation part 222 covers the sealing part 221 and is used to seal the gap between the air leakage port of the workpiece and the sealing part 221.

[0043] In this embodiment, the sealing part 221 can be made of metal alloys such as aluminum alloy or copper alloy to increase the hardness of the sealing member 22. The elastic deformation part 222 can be made of elastic materials such as silicone or rubber. Driven by the first driving member 21, the sealing member 22 moves horizontally to the air leakage gap of the workpiece. The elastic deformation part 222 of the sealing member 22 fits tightly with the air leakage port of the workpiece, filling the gap between the air leakage port of the workpiece and the sealing part 221, thereby effectively preventing gas from leaking from the air leakage port of the workpiece.

[0044] The first driving component 21 includes a first driving shaft 211, which is connected to the sealing component 22. The upper side wall of the fixture body 11 is provided with a through hole 114 for the first driving shaft 211 to pass through, and the inner side wall of the through hole 114 is provided with a second sealing ring 115.

[0045] The second sealing ring 115 is used to seal the gap between the first drive shaft 211 and the through hole 114, prevent air leakage at the through hole 114, improve the airtightness of the cavity 111, and improve the detection accuracy.

[0046] A groove may be provided on the inner wall of the through hole 114, and the second sealing ring 115 is engaged in the groove to prevent the second sealing ring 115 from moving with the movement of the first drive shaft 211.

[0047] A third sealing ring 212 is provided on the outer wall of the first drive shaft 211. The third sealing ring 212 can abut against the outer side of the through hole 114 to prevent air leakage at the through hole 114.

[0048] The first drive shaft 211 includes a shaft portion, a transition portion, and a push portion connected in sequence. The push portion is connected to the sealing member 22 and is movably disposed within the through hole 114. The third sealing ring 212 is disposed circumferentially along the root of the push portion and is mounted on the transition portion. When the first drive shaft 211 of the first drive member 21 drives the sealing member 22 to seal the air leakage port of the workpiece, the third sealing ring 212 abuts against the outer side of the through hole 114 on the side wall of the fixture body 11, further sealing the through hole 114, preventing air leakage at the through hole 114, further improving the airtightness of the cavity 111, and improving the detection accuracy.

[0049] A limiting groove 116 is provided next to the opening, and the first sealing ring 112 is engaged in the limiting groove 116.

[0050] The first sealing ring 112 is fixed in the limiting groove 116, which can fix the first sealing ring 112 and prevent the first sealing ring 112 from shifting during the detection process, thus reducing the detection accuracy.

[0051] The test fixture 1 also includes a second drive member 12, which is connected to the fixture body 11 in a transmission manner to drive the fixture body 11 to move in the horizontal direction.

[0052] The second driving component 12 can be a motor, a pneumatic cylinder, or a hydraulic cylinder. The second driving component 12 can drive the fixture body 11 to move horizontally back and forth between two workstations, facilitating the transfer of the workpiece to be inspected and improving inspection efficiency. The second driving component 12 can also be connected to a guide structure to improve the stability of the fixture body 11's movement. A cable chain structure can also be installed on the fixture body 11 to protect pipes, wires, and other structures connected to it.

[0053] The pressing assembly includes a support 3, a cover plate 4, and a lifting drive 5. The cover plate 4 is used to cover the opening of the cavity 111. The cover plate 4 is disposed on the support 3. The lifting drive 5 is connected to the support 3 to drive the support 3 to move the cover plate 4 vertically closer to or further away from the opening of the fixture body 11.

[0054] In this embodiment, the lifting drive 5 can be an electric cylinder, a pneumatic cylinder, or a motor. The support 3 can include a horizontal part and a vertical part. The lifting drive 5 is connected to the vertical part, and the horizontal part is vertically connected to the vertical part to form an L-shaped support 3. The cover plate 4 is disposed on the horizontal part. The lifting drive 5 drives the support 3 to move vertically upward so that the cover plate 4 is away from the opening of the fixture body 11, thereby facilitating the loading and unloading of workpieces in the cavity 111. Conversely, the lifting drive 5 drives the support 3 to move vertically downward so that the cover plate 4 covers the opening of the fixture body 11, sealing the cavity 111, so as to facilitate the detection of the airtightness of the workpieces in the cavity 111.

[0055] Preferably, the support 3 includes a left support member 31, a right support member 33 and a top plate 32. The left support member 31 and the right support member 33 are arranged opposite to each other and are respectively connected to the top plate 32. The cover plate 4 is disposed on the top plate 32.

[0056] The lifting drive unit 5 includes a left lifting drive part and a right lifting drive part. The left lifting drive part is connected to the left support member 31, and the right lifting drive part is connected to the right support member 33, so as to drive the top plate 32 to drive the cover plate 4 to move up and down in the vertical direction.

[0057] By simultaneously driving the support 3 to move vertically by the left and right lifting drive units, the stability of the cover plate 4's movement is improved, and the cover plate 4 is prevented from tilting due to unbalanced force on the support 3.

[0058] The left and right lifting drive units can be electric cylinders, pneumatic cylinders, or motors.

[0059] The left support member 31 or the right support member 33 is connected to the lifting guide member 6.

[0060] The lifting guide 6 may include a guide rail and a slider. The guide rail is mounted on the left or right support, and the slider is slidably connected to the guide rail. The left or right support 31 is connected to the slider. The lifting guide 6 improves the smoothness and accuracy of the lifting movement of the cover plate 4.

[0061] A buffer is provided on the top plate 32.

[0062] The buffer prevents the cover plate 4 from impacting the fixture body 11 during descent, while ensuring a tight seal. The buffer can be made of elastic silicone or a limiting block.

[0063] This application also provides an airtightness testing device, including the airtightness testing apparatus described above.

[0064] The airtightness testing device of this application includes the airtightness testing device in any of the above embodiments, and therefore has the beneficial effects brought by the airtightness testing device in any of the above embodiments, which will not be repeated here.

[0065] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An air tightness detecting device characterized by comprising: The utility model provides a test fixture, a sealing assembly and a compression assembly, and the sealing assembly is used for sealing a leakage hole of a workpiece in a cavity of the test fixture. The sealing assembly comprises a first driving member and a sealing member, the first driving member is arranged in the fixture body, the first driving member is in transmission connection with the sealing member to drive the sealing member to move in the cavity along a horizontal direction, and the sealing member is used for sealing the leakage hole of the workpiece in the cavity. The compression assembly is arranged above the fixture body and is used for covering the opening of the cavity to form a sealed detection cavity. The sealing member comprises a sealing part and an elastically deformed part, the first driving member is in transmission connection with the sealing part to drive the sealing part to be inserted into the leakage hole of the workpiece, and the elastically deformed part is arranged on the sealing part and is used for sealing a gap between the leakage hole of the workpiece and the sealing part.

2. The air tightness testing apparatus of claim 1, wherein, The first driving member comprises a first driving shaft, the first driving shaft is connected with the sealing member, a through hole for arranging the first driving shaft is arranged on the upper side wall of the fixture body, and a second sealing ring is arranged on the inner side wall of the through hole.

3. The air tightness testing apparatus of claim 1, wherein, A third sealing ring is arranged on the outer side wall of the first driving shaft, the third sealing ring can abut against the outer side of the through hole to prevent air leakage at the through hole.

4. The air tightness testing apparatus of claim 3, wherein A limiting groove is arranged beside the opening, and the first sealing ring is clamped in the limiting groove.

5. The air tightness testing apparatus of claim 1, wherein The test fixture further comprises a second driving member, the second driving member is in transmission connection with the fixture body to drive the fixture body to move along the horizontal direction.

6. The air tightness testing apparatus of claim 1, wherein The compression assembly comprises a support, a cover plate and a lifting driving member, the cover plate is used for covering the opening of the cavity, the cover plate is arranged on the support, and the lifting driving member is in transmission connection with the support to drive the support to drive the cover plate to move along a vertical direction and approach or move away from the opening of the fixture body.

7. The air tightness testing apparatus of any one of claims 1-6, wherein, The support comprises a left support member, a right support member and a top plate, the left support member and the right support member are oppositely arranged, the left support member and the right support member are respectively connected with the top plate, and the cover plate is arranged on the top plate.

8. The air tightness testing apparatus of claim 7, wherein, The lifting driving member comprises a left lifting driving part and a right lifting driving part, the left lifting driving part is in transmission connection with the left support member, and the right lifting driving part is connected with the right support member to drive the top plate to drive the cover plate to move up and down along the vertical direction. The left support member or the right support member is connected with a lifting guide member.

9. The air tightness testing apparatus of claim 8, wherein, A buffer member is arranged on the top plate.

10. The air tightness testing apparatus of claim 8, wherein, The utility model provides a gas tightness detection device.

11. An air tightness testing apparatus characterized by, ​

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