Hub air tightness multichannel synchronous detection table

Abstract

The invention discloses a hub airtightness multichannel synchronous detection table, and relates to the technical field of hub airtightness detection, the hub airtightness multichannel synchronous detection table comprises a table body, a bearing mechanism, a sealing mechanism, an air compressor, a detection mechanism and a pressure sensor, the bearing mechanism is installed in the middle of the table body, the sealing mechanism is arranged at the top of the bearing mechanism, and the sealing mechanism is used for fitting and sealing the edge of a hub; the air compressor is fixed to one end of the table body and fixedly connected with the middle of the sealing mechanism in a penetrating mode through the air inlet pipe, the detection mechanism is fixed to one end of the table body, and the pressure sensor is installed on one side of the sealing mechanism. Through the arrangement mode that the bearing mechanism, the sealing mechanism and the detection mechanism are matched, the outer wall air pressure detection technology, the inner wall flow monitoring technology and the infrared thermal imaging technology are integrated, the leakage position and degree are synchronously recognized, multi-channel synchronous detection of the hub is achieved, the detection comprehensiveness is improved, a clamping assembly is buffered through a rubber pad, and the detection precision is improved. And the surface of the hub is prevented from being scratched or indented in the detection process.

Description

Technical Field

[0001] This invention relates to the field of wheel hub air tightness testing technology, and in particular to a multi-channel synchronous testing platform for wheel hub air tightness. Background Technology

[0002] Wheel hubs are critical components of vehicles such as cars and motorcycles, and their quality directly affects vehicle safety, handling, and fuel economy. During the manufacturing process, wheel hubs may experience airtightness issues due to casting defects, poor welding, or machining errors, such as microcracks, sand holes, or inadequate sealing. If a wheel hub leaks, it can lead to abnormal tire pressure, affecting driving stability and even causing serious accidents like tire blowouts. Therefore, airtightness testing of wheel hubs before they leave the factory is a crucial part of quality control.

[0003] Traditional air tightness testing often uses single-channel water testing or air pressure testing, which has problems such as low efficiency, poor accuracy, inability to locate leak points, and reliance on manual judgment. In addition, water testing is prone to causing wheel hub corrosion, which requires subsequent drying of the wheel hub, making the operation cumbersome. On the other hand, single air pressure testing can only determine whether there is a leak, but it is difficult to identify the location of tiny defects, resulting in low efficiency of wheel hub air tightness testing.

[0004] Content of this invention The purpose of this invention is to provide a multi-channel synchronous testing station for wheel hub air tightness to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a multi-channel synchronous testing platform for wheel hub airtightness, comprising: Platform; The support mechanism is installed in the middle of the platform. A sealing mechanism is disposed on the top of the bearing mechanism and is used for sealing the edge of the wheel hub. An air compressor is fixed to one end of the platform, and the air compressor is fixedly connected to the middle of the sealing mechanism through an air inlet pipe. The testing mechanism is fixed to one end of the platform. A pressure sensor is mounted on one side of the sealing mechanism.

[0006] Preferably, the load-bearing mechanism includes: A support platform, which is fixed to the upper surface of the platform body; A fixing component is installed in the middle of the support platform; An upper top assembly, wherein the upper top assembly is disposed within the cavity of the fixed assembly; Clamping components, a plurality of clamping components are arranged in a circular array on top of the fixing component.

[0007] Preferably, the fixing component includes: A fixing box is fixedly inserted into the middle of the support platform, and the upper top assembly is disposed in the middle of the fixing box; Card slots, a plurality of card slots are formed on the top of the fixing box, and the clamping assembly is disposed in the inner cavity of the card slots; A fixing rod, wherein a plurality of the fixing rods are arranged in a circular array, and the fixing rods are fixedly connected to the inner wall of the slot; A compression spring is sleeved on the outer wall of the fixed rod, and one end of the compression spring is fixedly connected to the inner wall of the slot.

[0008] Preferably, the clamping assembly includes: The slider is slidably inserted into the outer wall of the fixed rod; A roller, which rotates at the bottom of the slider via a pin, and the upper push assembly is used to push the roller; A clamping block, which is fixed to the top of the slider; A rubber pad is fixed to the outer wall of the clamping block, and a telescopic rubber pad is used for fitting and snapping against the inner wall of the wheel hub.

[0009] Preferably, the top component includes: Top block, which is slidably connected to the middle of the fixed box; A rubber block, which is fixed to the upper surface of the top block; A top rod, which is fixed to the bottom of the top block; A conical cover, which is fixed to the bottom end of the top rod, and the conical cover is movably pushed and connected to the outer wall of multiple rollers; The first electric telescopic rod is fixed to the bottom of the fixed box, and the telescopic end of the first electric telescopic rod is fixedly connected to the inner wall of the conical cover.

[0010] Preferably, the sealing mechanism includes: Two seals are disposed opposite each other on both sides of the bearing mechanism. The pressure sensor is installed on one side of one of the seals. The air compressor is fixedly inserted and connected to the middle of one of the seals through an air inlet pipe. The second electric telescopic rod is fixed to the other end of the platform.

[0011] Preferably, the seal includes: The two semi-rings form a circular structure, the pressure sensor is fixedly connected to one side of one of the semi-rings, and the second electric telescopic rod is fixedly connected to the outer wall of the other semi-ring. The first sealing strip, and multiple first sealing strips are respectively fixed to the inner wall of the top and the inner wall of the bottom of the semi-ring; The second sealing strip is fixed to the end of the semi-ring.

[0012] Preferably, the testing organization includes: A bracket, which is fixed to one end of the platform; The third electric telescopic rod is fixed to the top of the bracket; A connecting ring, which is fixed to the telescopic end of the third electric telescopic rod; A high-pressure air pipe, wherein the high-pressure air pipe is fixedly inserted into the outer wall of the connecting ring; A cover plate assembly, which is mounted on the bottom of the connecting ring; An infrared thermal imager, wherein the infrared thermal imager is mounted on one side of the cover plate assembly; A flow sensor is mounted on the other side of the cover plate assembly. The infrared thermal imager and the flow sensor are used for infrared thermal imaging and flow sensing of the wheel hub, respectively.

[0013] Preferably, the cover plate assembly includes: A pressure plate, which is fixed to the top of the pressure plate by screws; A movable groove is formed in the middle of the pressure plate; A rotating tube is rotatably connected to the middle of a pressure plate via a bearing, and the rotating tube is rotatably connected to the bottom of a connecting ring. A gear, the gear being fixed to the top of the rotating tube, the gear being positioned in the middle of the movable groove; A rack, which meshes with the outer wall of a gear and slides with the inner cavity of a movable groove; The fourth electric telescopic rod is fixed to one side of the pressure plate, and the telescopic end of the fourth electric telescopic rod is fixedly connected to one end of the rack.

[0014] Preferably, the cover plate assembly further includes: A rotating block, which is fixed to the bottom of the rotating tube; Support rods, multiple support rods are respectively fixed to the outer wall of the rotating block, the infrared thermal imager is fixedly connected to one end of one of the support rods, and the flow sensor is fixedly connected to one end of another support rod; A positioning groove is formed on the lower surface of the pressure plate, and the support rod is movably connected to the inner cavity of the positioning groove.

[0015] The technical effects and advantages of this invention are as follows: (1) The present invention integrates external wall air pressure detection, internal wall flow monitoring and infrared thermal imaging technology through the combination of bearing mechanism, sealing mechanism and detection mechanism, and simultaneously identifies the location and degree of leakage, realizes multi-channel synchronous detection of wheel hub, and improves the comprehensiveness of detection; (2) The bearing mechanism of the present invention drives the roller linkage clamping block through the conical cover and works with the compression spring to achieve rapid clamping of the inner wall of the wheel hub. The clamping component uses rubber pad buffer and the sealing strip uses flexible material to avoid scratches or indentations on the surface of the wheel hub during the inspection process. The sealing mechanism adopts a split semi-ring design and pushes the electric telescopic rod to fit the edge of the wheel hub, which facilitates the convenient disassembly and assembly of the wheel hub and improves the inspection efficiency. (3) The cover plate assembly of the present invention has a built-in rotatable support rod that drives the infrared thermal imager and flow sensor to move back and forth. Combined with hot gas injection, it can accurately locate the leakage area, solve the problem of blind spots in traditional static detection, and reduce manual intervention and improve efficiency through the drive of multiple electric telescopic rods. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the overall front structure of the present invention.

[0018] Figure 3 This is a schematic diagram of the overall structure of the sealing element of the present invention.

[0019] Figure 4 For the present invention Figure 2 Enlarged structural diagram at point A in the middle.

[0020] Figure 5 For the present invention Figure 2 Enlarged structural diagram at point B.

[0021] Figure 6 This is a schematic diagram of the overall structure of the top block of the present invention.

[0022] Figure 7 This is a top-view cross-sectional view of the pressure plate of the present invention.

[0023] Figure 8 This is a top-view cross-sectional view of the connecting ring structure of the present invention.

[0024] In the diagram: 100, platform; 200, bearing mechanism; 201, bearing platform; 202, fixing component; 221, fixing box; 222, slot; 223, fixing rod; 224, compression spring; 203, upper lifting component; 231, top block; 232, rubber block; 233, top rod; 234, conical cover; 235, first electric telescopic rod; 204, clamping component; 241, slider; 242, roller; 243, clamping block; 244, rubber pad; 300, sealing mechanism; 301, sealing element; 311, semi-ring; 312, first seal. 313. Second sealing strip; 302. Second electric telescopic rod; 400. Air compressor; 500. Detection mechanism; 501. Bracket; 502. Third electric telescopic rod; 503. Connecting ring; 504. High-pressure air pipe; 505. Cover plate assembly; 551. Pressure plate; 552. Movable groove; 553. Rotating tube; 554. Gear; 555. Rack; 556. Fourth electric telescopic rod; 557. Rotating block; 558. Support rod; 559. Positioning groove; 506. Infrared thermal imager; 507. Flow sensor; 600. Pressure sensor. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] This invention provides, for example Figure 1-8 The wheel hub airtightness multi-channel synchronous testing station shown is shown.

[0027] Example 1 includes a platform 100, a support mechanism 200, a sealing mechanism 300, an air compressor 400, and a pressure sensor 600. The support mechanism 200 is installed in the middle of the platform 100 and is used to clamp and limit the inner wall of the wheel hub. The sealing mechanism 300 is located on the top of the support mechanism 200 and is used for sealing the edge of the wheel hub. The air compressor 400 is fixed to one end of the platform 100 and is fixedly inserted and connected to the middle of the sealing mechanism 300 through an air inlet pipe, which facilitates the air compressor 400 to vent air between the sealing mechanism 300 and the outer wall of the wheel hub. The pressure sensor 600 is installed on one side of the sealing mechanism 300 and is used to detect the air pressure between the inner cavity of the sealing mechanism 300 and the wheel hub. If the sensed air pressure is stable, it indicates that the airtightness of the wheel hub is not a problem.

[0028] The bearing mechanism 200 includes a bearing platform 201, a fixing component 202, an upper lifting component 203, and a clamping component 204. The bearing platform 201 is fixed to the upper surface of the platform body 100. The fixing component 202 is installed in the middle of the bearing platform 201. The upper lifting component 203 is disposed in the inner cavity of the fixing component 202. Multiple clamping components 204 are arranged in a ring array on the top of the fixing component 202. The clamping components 204 are used to lock and limit the center of the wheel hub.

[0029] Specifically, the fixing component 202 includes a fixing box 221, a slot 222, a fixing rod 223, and a compression spring 224. The fixing box 221 is fixedly inserted into the middle of the support platform 201. The upper push component 203 is disposed in the middle of the fixing box 221. Multiple slots 222 are opened on the top of the fixing box 221. The clamping component 204 is disposed in the inner cavity of the slot 222. Multiple fixing rods 223 are arranged in a ring array. The fixing rods 223 are fixedly connected to the inner wall of the slot 222. The compression spring 224 is sleeved on the outer wall of the fixing rod 223. One end of the compression spring 224 is fixedly connected to the inner wall of the slot 222. The compression spring 224 is used to elastically push the clamping component 204, so that the clamping component 204 can be quickly reset. The top assembly 203 includes a top block 231, a rubber block 232, a top rod 233, a conical cover 234, and a first electric telescopic rod 235. The top block 231 is slidably connected to the middle of the fixed box 221. The rubber block 232 is fixed to the upper surface of the top block 231. The top rod 233 is fixed to the bottom of the top block 231. The conical cover 234 is fixed to the bottom end of the top rod 233. The first electric telescopic rod 235 is fixed to the bottom of the fixed box 221. The telescopic end of the first electric telescopic rod 235 is fixedly connected to the inner wall of the conical cover 234. The first electric telescopic rod 235 is electrically connected to an external power source through an external switch. Driven by the first electric telescopic rod 235, the conical cover 234 can be stably topped, which facilitates the movement of multiple rollers 242, causing the clamping block 243 to move closer to and press against the inner wall of the hub, thus facilitating the position limitation of the hub. The clamping assembly 204 includes a slider 241, a roller 242, a clamping block 243, and a rubber pad 244. The slider 241 is slidably connected to the outer wall of the fixing rod 223. The roller 242 rotates at the bottom of the slider 241 via a pin. The upper push assembly 203 is used to push the roller 242. The clamping block 243 is fixed to the top of the slider 241. The conical cover 234 is movably pushed and connected to the outer wall of the multiple rollers 242. The rubber pad 244 is fixed to the outer wall of the clamping block 243. The rubber pad 244 is used for the fit and snapping of the inner wall of the wheel hub. Through the rubber properties of the rubber pad 244, the squeezing damage to the inner wall of the wheel hub is reduced.

[0030] Furthermore, the sealing mechanism 300 includes a sealing element 301 and a second electric telescopic rod 302. The two sealing elements 301 are disposed opposite each other on both sides of the bearing mechanism 200. The pressure sensor 600 is installed on one side of one of the sealing elements 301. The air compressor 400 is fixedly inserted and connected to the middle of one of the sealing mechanisms 300 through the air intake pipe. The second electric telescopic rod 302 is fixedly connected to the outer wall of the other sealing mechanism 300. The second electric telescopic rod 302 is fixed to the other end of the platform 100. The second electric telescopic rod 302 is used to push the other sealing mechanism 300, so that the hub can be placed between the two separated sealing mechanisms 300. By pushing the sealing mechanism 300, the sealing mechanism 300 can fit and seal with the top and bottom of the hub.

[0031] Specifically, the sealing element 301 includes a semi-ring 311, a first sealing strip 312, and a second sealing strip 313. The two semi-rings 311 form a circular structure. The pressure sensor 600 is fixedly connected to one side of one of the semi-rings 311, and the second electric telescopic rod 302 is fixedly connected to the outer wall of the other semi-ring 311. Multiple first sealing strips 312 are respectively fixed to the inner walls of the top and bottom of the semi-ring 311. The second sealing strips 313 are fixed to the ends of the semi-rings 311, so that when the two semi-rings 311 are facing each other, the two second sealing strips 313 can maintain a close and sealed state, so that the two semi-rings 311 and the outer wall of the hub form a sealed cavity structure, which allows the air compressor 400 to fill the inner cavity with gas, and the pressure sensor 600 can sense the air pressure in the sealed cavity to ensure the sealing of the outer wall of the hub.

[0032] Example 2, based on Example 1, further includes a detection mechanism 500. The detection mechanism 500 is fixed to one end of the platform 100. The detection mechanism 500 includes a bracket 501, a third electric telescopic rod 502, a connecting ring 503, a high-pressure air pipe 504, a cover plate assembly 505, an infrared thermal imager 506, and a flow sensor 507. The bracket 501 is fixed to one end of the platform 100, and the third electric telescopic rod 502 is fixed to the top of the bracket 501. The third electric telescopic rod 502 is electrically connected to an external power supply via an external switch. The connecting ring 503 is fixed to the telescopic end of the third electric telescopic rod 502, facilitating the telescopic movement of the connecting ring 503. The support platform 201 moves up and down. The high-pressure air pipe 504 is fixedly inserted into the outer wall of the connecting ring 503. The high-pressure air pipe 504 is connected to a hot air source through an air pump. The cover plate assembly 505 is installed at the bottom of the connecting ring 503 so that the third electric telescopic rod 502 can press the cover plate assembly 505 to the top of the two semi-rings 311 to seal the inner cavity of the hub. The infrared thermal imager 506 is installed on one side of the cover plate assembly 505, and the flow sensor 507 is installed on the other side of the cover plate assembly 505. The infrared thermal imager 506 and the flow sensor 507 are used for infrared thermal image sensing and flow sensing of the hub, respectively.

[0033] In particular, the cover plate assembly 505 includes a pressure plate 551, a movable groove 552, a rotating tube 553, a gear 554, a rack 555, a fourth electric telescopic rod 556, a rotating block 557, a support rod 558, and a positioning groove 559. The pressure plate 551 is fixed to the top of the pressure plate 551 by screws. The movable groove 552 is opened in the middle of the pressure plate 551. The rotating tube 553 is rotatably connected to the middle of the pressure plate 551 through a bearing. The rotating tube 553 is rotatably connected to the bottom of the connecting ring 503. The gear 554 is fixed to the top of the rotating tube 553. 54 is located in the middle of the movable groove 552. The rack 555 meshes with the outer wall of the gear 554, and the rack 555 slides in the inner cavity of the movable groove 552. The fourth electric telescopic rod 556 is fixed to one side of the pressure plate 551. The telescopic end of the fourth electric telescopic rod 556 is fixedly connected to one end of the rack 555. The fourth electric telescopic rod 556 is electrically connected to an external power supply through an external switch. The rotating block 557 is fixed to the bottom of the rotating tube 553. Multiple support rods 558 are respectively fixed to the outer wall of the rotating block 557. The infrared thermal imager 506 is connected to the gear 554. One end of a support rod 558 is fixedly connected, and the flow sensor 507 is fixedly connected to one end of another support rod 558. A positioning groove 559 is formed on the lower surface of the pressure plate 551. The support rod 558 is movably connected to the inner cavity of the positioning groove 559. Driven by the fourth electric telescopic rod 556, its rack 555 moves, facilitating the rotation of the gear 554, which in turn drives the rotating tube 553 to rotate. When the fourth electric telescopic rod 556 is driven in the reverse direction, the gear 554 moves in the reverse direction, allowing the flow sensor 507 and the infrared thermal imager 506 to be positioned in a fixed position. The reciprocating motion of the inner cavity of the slot 559 allows the pressure sensor 600 to detect the outer wall of the hub while the flow sensor 507 detects gas on the inner wall of the hub, facilitating accurate detection of leak locations. Furthermore, when the air compressor 400 is not supplying air to the outer wall of the hub, the connection between the high-pressure air pipe 504 and the external air pump allows hot air to be injected into the inner cavity of the hub through the rotating pipe 553. The movement of the infrared thermal imager 506 enables it to detect heat in the inner cavity of the hub. If there is an abnormality in the heat detection at the outlet, it facilitates multi-channel airtightness detection of the hub.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-channel synchronous testing platform for wheel hub air tightness, characterized in that, include: Platform (100); A support mechanism (200) is installed in the middle of the platform (100); A sealing mechanism (300) is disposed on the top of the bearing mechanism (200) and is used for sealing the edge of the wheel hub. An air compressor (400) is fixed to one end of a platform (100), and the air compressor (400) is fixedly connected to the middle of a sealing mechanism (300) through an air inlet pipe. The testing mechanism (500) is fixed to one end of the platform (100); A pressure sensor (600) is mounted on one side of the sealing mechanism (300).

2. The multi-channel synchronous testing platform for wheel hub airtightness according to claim 1, characterized in that, The bearing mechanism (200) includes: A support platform (201) is fixed to the upper surface of the platform body (100); A fixing component (202) is installed in the middle of the support platform (201); An upper top assembly (203) is disposed within the cavity of the fixed assembly (202); Clamping components (204), a plurality of clamping components (204) are arranged in a ring array on top of the fixing component (202).

3. The multi-channel synchronous testing platform for wheel hub airtightness according to claim 2, characterized in that, The fixing component (202) includes: A fixing box (221) is fixedly inserted into the middle of the support platform (201), and the upper top component (203) is disposed in the middle of the fixing box (221); Card slots (222), a plurality of card slots (222) are provided on the top of the fixing box (221), and the clamping assembly (204) is disposed in the inner cavity of the card slots (222); A fixing rod (223) is provided, and a plurality of the fixing rods (223) are arranged in a ring array. The fixing rods (223) are fixedly connected to the inner wall of the slot (222). Compression spring (224) is sleeved on the outer wall of the fixing rod (223), and one end of the compression spring (224) is fixedly connected to the inner wall of the slot (222).

4. The multi-channel synchronous testing platform for wheel hub airtightness according to claim 3, characterized in that, The clamping assembly (204) includes: The slider (241) is slidably inserted into the outer wall of the fixed rod (223); Roller (242), which rotates at the bottom of slider (241) via a pin, and upper push assembly (203) is used to push roller (242); A clamping block (243) is fixed to the top of the slider (241); Rubber pad (244), the rubber pad (244) is fixed to the outer wall of the clamping block (243), and the telescopic rubber pad (244) is used for the fitting and snapping of the inner wall of the hub.

5. The multi-channel synchronous testing platform for wheel hub air tightness according to claim 4, characterized in that, The upper component (203) includes: Top block (231), which is slidably connected to the middle of the fixed box (221); A rubber block (232) is fixed to the upper surface of the top block (231); Top rod (233), the top rod (233) is fixed to the bottom of the top block (231); A conical cover (234) is fixed to the bottom end of a top rod (233), and the conical cover (234) is movably pushed and connected to the outer wall of a plurality of rollers (242); The first electric telescopic rod (235) is fixed to the bottom of the fixed box (221), and the telescopic end of the first electric telescopic rod (235) is fixedly connected to the inner wall of the conical cover (234).

6. The multi-channel synchronous testing platform for wheel hub airtightness according to claim 1, characterized in that, The sealing mechanism (300) includes: Two seals (301) are disposed opposite each other on both sides of the bearing mechanism (200). The pressure sensor (600) is installed on one side of one of the seals (301). The air compressor (400) is fixedly inserted and connected to the middle of one of the seals (300) through an air inlet pipe. The second electric telescopic rod (302) is fixed to the other end of the platform (100).

7. The multi-channel synchronous testing platform for wheel hub air tightness according to claim 6, characterized in that, The seal (301) includes: The two semi-ring bodies (311) form a ring structure. The pressure sensor (600) is fixedly connected to one side of one of the semi-ring bodies (311), and the second electric telescopic rod (302) is fixedly connected to the outer wall of the other semi-ring body (311). First sealing strip (312), multiple first sealing strips (312) are respectively fixed to the inner wall of the top and the inner wall of the bottom of the semi-ring (311); The second sealing strip (313) is fixed to the end of the semi-ring (311).

8. The multi-channel synchronous testing platform for wheel hub air tightness according to claim 1, characterized in that, The testing organization (500) includes: A bracket (501) is fixed to one end of the platform (100); The third electric telescopic rod (502) is fixed to the top of the bracket (501); A connecting ring (503) is fixed to the telescopic end of the third electric telescopic rod (502); High-pressure air pipe (504), wherein the high-pressure air pipe (504) is fixedly inserted into the outer wall of the connecting ring (503); A cover plate assembly (505) is mounted on the bottom of a connecting ring (503); An infrared thermal imager (506) is mounted on one side of the cover plate assembly (505); A flow sensor (507) is mounted on the other side of the cover plate assembly (505). The infrared thermal imager (506) and the flow sensor (507) are used for infrared thermal imaging sensing and flow sensing of the wheel hub, respectively.

9. The multi-channel synchronous testing platform for wheel hub air tightness according to claim 8, characterized in that, The cover plate assembly (505) includes: Pressure plate (551), the pressure plate (551) is fixed to the top of the pressure plate (551) by screws; The movable groove (552) is located in the middle of the pressure plate (551); Rotating tube (553), the rotating tube (553) is rotatably inserted into the middle of the pressure plate (551) through a bearing, and the rotating tube (553) is rotatably inserted into the bottom of the connecting ring (503); Gear (554), the gear (554) is fixed to the top of the rotating tube (553), and the gear (554) is located in the middle of the movable groove (552); A rack (555) meshes with the outer wall of a gear (554) and slides with the inner cavity of a movable groove (552). The fourth electric telescopic rod (556) is fixed to one side of the pressure plate (551), and the telescopic end of the fourth electric telescopic rod (556) is fixedly connected to one end of the rack (555).

10. The multi-channel synchronous testing platform for wheel hub airtightness according to claim 9, characterized in that, The cover plate assembly (505) also includes: Rotating block (557), the rotating block (557) is fixed to the bottom of rotating tube (553); Support rods (558), a plurality of support rods (558) are respectively fixed relative to the outer wall of the rotating block (557), the infrared thermal imager (506) is fixedly connected to one end of one of the support rods (558), and the flow sensor (507) is fixedly connected to one end of another support rod (558); The positioning groove (559) is located on the lower surface of the pressure plate (551), and the support rod (558) is movably connected to the inner cavity of the positioning groove (559).

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