Air tightness testing device

Abstract

The utility model provides an air tightness testing device, and belongs to the field of testing equipment. The problem that the air tightness of an existing hub motor is manually tested is solved. The air tightness testing device comprises a control system, a base, a truss and a workbench, tool bodies are arranged on the workbench, each tool body is provided with a pneumatic device in a matched mode, a mounting cavity is formed in the center of each tool body, an air hole is formed in each mounting cavity and matched with an air source connector of a hub motor, and the pneumatic devices are communicated with the air holes through pipe fittings. A truss is arranged on the workbench and provides an air source, a testing mechanism is arranged on the truss and comprises a tool plug, a driving air cylinder and an air pressure sensor, the tool plug is provided with a through hole communicated with the interior of the hub motor, the air pressure sensor is installed in the through hole in the tool plug and used for sensing air pressure numerical value changes, and a movable guide rail is laid on the workbench and used for guiding the hub motor to move. And the workbench is driven to move through a moving cylinder. The device has the advantage of automatic testing.

Description

Technical Field

[0001] This utility model belongs to the field of testing equipment, and relates to a testing device, particularly an airtightness testing device. Background Technology

[0002] In-wheel motors, also known as wheel-mounted motors, are characterized by integrating power, transmission, and braking devices into the wheel hub, greatly simplifying the wheel portion of electric vehicles. Therefore, the airtightness of in-wheel motors needs to be tested during manufacturing.

[0003] The current method for testing the air tightness of hub motors involves manually inflating the inner cavity of the hub motor. After the inner cavity is filled with air, the hub motor is immersed in water, and the presence of bubbles is observed to determine if there is a leak. This testing procedure is complex, relies excessively on manual judgment, is labor-intensive, and has slow testing efficiency. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by providing an airtightness testing device to solve these problems.

[0005] The purpose of this utility model can be achieved through the following technical solution: an airtightness testing device, characterized in that it includes a control system, a base, a truss set on the base, and a movable workbench, on which a tooling body with a symmetrical structure is provided;

[0006] Each of the tooling bodies is equipped with a pneumatic device. The tooling body has a mounting cavity in the center for the hub motor to be fitted and installed. The mounting cavity has air holes inside, which are adapted to the air source connector of the hub motor.

[0007] The pneumatic device is connected to an air port via a pipe and provides an air source;

[0008] The truss is equipped with a test mechanism that can move up and down and is used for airtightness testing.

[0009] The testing mechanism includes a tooling plug for sealing the center hole of the hub motor, a drive cylinder for driving the tooling plug, and a pressure sensor for airtightness testing.

[0010] The tooling plug has a through hole that communicates with the inside of the hub motor. The air pressure sensor is installed inside the through hole of the tooling plug to sense changes in air pressure.

[0011] The workbench is equipped with movable guide rails, and the workbench is moved by a movable cylinder.

[0012] In the aforementioned airtightness testing device, a displacement sensor is also provided on the base for measuring the distance of the workbench movement. The workbench has a concave cross-section and moves under the drive of a moving guide rail and a moving cylinder.

[0013] In the aforementioned airtightness testing device, the delivery end of the drive cylinder is also provided with a fixed plate, and its tooling plug is installed on the fixed plate in a relative structure.

[0014] In the aforementioned airtightness testing device, the end of the tooling plug is provided with a conical sealing structure, and the conical surface is covered with an elastic sealing ring. The cross-section of the elastic sealing ring is a double-lip structure, which forms a bidirectional airtight contact with the center hole of the hub motor.

[0015] Compared with existing technologies, this airtightness testing device has the following advantages:

[0016] 1. The main body of the tooling is symmetrically arranged and forms a dual-station structure that can process multiple hub motors at the same time, improving testing efficiency;

[0017] 2. By using a moving guide rail, displacement sensor, and moving cylinder, the worktable achieves high-precision positioning and stable movement. The conical sealing structure of the tooling plug, combined with a double-lip elastic sealing ring, achieves bidirectional airtight contact, significantly improving sealing reliability. The air pressure sensor is built into the through hole to directly monitor the internal pressure of the hub motor, providing more accurate data feedback. The drive cylinder is mounted on the tooling plug via a fixed plate, ensuring the rigidity of the mechanism during testing, preventing deviation, reducing manual intervention, and achieving automated testing. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the airtightness testing device.

[0019] Figure 2 This is a schematic diagram of the internal three-dimensional structure of this airtightness testing device.

[0020] In the diagram, 1. Base; 2. Truss; 3. Workbench; 4. Tooling body; 5. Mounting cavity; 6. Pneumatic device; 7. Air hole; 8. Tooling plug; 9. Drive cylinder; 10. Air pressure sensor; 11. Moving guide rail; 12. Moving cylinder; 13. Displacement sensor; 14. Fixing plate; 15. Elastic sealing ring. Detailed Implementation

[0021] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0022] like Figure 1As shown, this airtightness testing device includes a control system, a base 1, a truss 2 mounted on the base 1, and a movable workbench 3. The workbench 3 has symmetrically arranged fixture bodies 4, each equipped with a pneumatic device 6. The center of each fixture body 4 has a mounting cavity 5 for the fitting and installation of a hub motor. The mounting cavity 5 contains air holes 7, which are compatible with the air source connector of the hub motor. The pneumatic device 6 is connected to the air holes 7 via pipes and provides an air source. The truss 2... A test mechanism for airtightness testing is provided, which can move up and down. The test mechanism includes a tooling plug 8 for sealing the center hole of the hub motor, a drive cylinder 9 for driving the tooling plug 8, and a pressure sensor 10 for airtightness testing. The tooling plug 8 has a through hole that communicates with the inside of the hub motor. The pressure sensor 10 is installed inside the through hole on the tooling plug 8 to sense changes in air pressure. The worktable 3 is equipped with a moving guide rail 11, and the worktable 3 is driven to move by the moving cylinder 12. A displacement sensor 13 is also provided on the base 1 for measuring the distance of the worktable 3. The worktable has a concave cross-section and moves under the combined drive of the moving guide rail 11 and the moving cylinder 12. A fixed plate 14 is also provided at the conveying end of the drive cylinder 9, and the tooling plug 8 is mounted on the fixed plate 14 in a relative structure. The end of the tooling plug 8 is provided with a conical sealing structure, and the conical surface is covered with an elastic sealing ring 15. The cross section of the elastic sealing ring 15 is a double-lip structure, which forms a bidirectional airtight contact with the center hole of the hub motor.

[0023] The main body of the tooling 4 is symmetrically arranged and forms a dual-station structure that can process multiple hub motors at the same time, improving testing efficiency.

[0024] The hub motor is installed in the mounting cavity 5 of the fixture body 4 and secured by the pneumatic device 6. The moving worktable 3 brings the hub motor to the test position. The test mechanism on the truss 2 descends, and the fixture plug 8 is pressed into the center hole of the hub motor through the drive cylinder 9, with the conical sealing structure ensuring a seal. Then, the pneumatic device 6 inflates the hub motor through the air hole 7, and the air pressure sensor 10 monitors the pressure change to determine whether the airtightness is qualified. After the test is completed, the worktable 3 is removed, and the hub motor is taken out.

[0025] The movable guide rail 11, displacement sensor 13 and movable cylinder 12 work together to achieve high-precision positioning and stable movement of the worktable 3. The conical sealing structure of the tooling plug 8 is combined with the double-lip elastic sealing ring 15 to achieve bidirectional airtight contact, which significantly improves the sealing reliability. The air pressure sensor 10 is built into the through hole to directly monitor the internal pressure of the hub motor, and the data feedback is more accurate. The drive cylinder 9 is mounted on the tooling plug 8 through the fixing plate 14 to ensure the rigidity of the mechanism during the test, avoid displacement, reduce manual intervention and realize automated testing.

[0026] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0027] Although this document uses a lot of technical terms, the possibility of using other terms is not excluded. These terms are used merely to facilitate the description and explanation of the essence of this invention; interpreting them as any kind of additional limitation would contradict the spirit of this invention.

Claims

1. An airtightness testing device, characterized in that, It includes a control system, a base (1), a truss (2) set on the base (1), and a movable workbench (3), on which a tooling body (4) is provided in a symmetrical structure. Each of the tooling bodies (4) is equipped with a pneumatic device (6). The tooling body (4) has a mounting cavity (5) in the center for the hub motor to be fitted and installed. The mounting cavity (5) has an air hole (7) inside, which is adapted to the air source connector of the hub motor. The pneumatic device (6) is connected to the air hole (7) through a pipe and provides an air source; The truss (2) is equipped with a test mechanism that can move up and down and is used for airtightness testing; The testing mechanism includes a tooling plug (8) for sealing the center hole of the hub motor, a drive cylinder (9) for driving the tooling plug (8) to move, and a pressure sensor (10) for air tightness testing. The tooling plug (8) has a through hole that communicates with the inside of the hub motor. The air pressure sensor (10) is installed inside the through hole on the tooling plug (8) to sense changes in air pressure. The workbench (3) is equipped with a movable guide rail (11), and the workbench (3) is driven to move by a movable cylinder (12).

2. The airtightness testing device according to claim 1, characterized in that, The base (1) is also equipped with a displacement sensor (13) for measuring the distance of the workbench (3). The workbench has a concave cross-section and moves under the drive of the moving guide rail (11) and the moving cylinder (12).

3. The airtightness testing device according to claim 1, characterized in that, The drive cylinder (9) is also provided with a fixed plate (14) at the delivery end, and its tooling plug (8) is installed on the fixed plate (14) in a relative structure.

4. The airtightness testing device according to claim 1, characterized in that, The end of the tooling plug (8) is provided with a conical sealing structure, and the conical surface is covered with an elastic sealing ring (15). The cross section of the elastic sealing ring (15) is a double-lip structure, which forms a bidirectional airtight contact with the center hole of the hub motor.

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