Aluminum alloy wheel hub air tightness detection equipment

Abstract

This invention discloses an aluminum alloy wheel hub airtightness testing device, relating to the field of wheel hub airtightness testing technology. It includes a support frame and a testing component. A rotating device is installed at the bottom of the support frame, and a testing frame is fixedly installed at the output end of the rotating device. A cylinder is installed at the top of the inner wall of the testing frame, and a sealing plate is fixedly installed at the output end of the cylinder. A water tank is installed at the bottom of the testing frame, and a defoaming frame is slidably installed on the inner wall of the water tank. The device also includes a testing assembly. The testing assembly includes a positioning frame, a hollow plate, a contact plate, a contact roller, a contact groove, a lowering frame, and a lowering roller. When the lowering frame moves downward, it squeezes the contact plate, causing the contact roller to move rearward. The rearward movement of the contact roller allows it to fit against the testing surface of the testing component, preventing multi-pore bubbles from coalescing into a sheet. This accurately distinguishes between single and multiple horizontal pores, thereby improving the airtightness testing accuracy of the testing component.

Description

Technical Field

[0001] This invention belongs to the field of wheel hub air tightness testing, specifically relating to an aluminum alloy wheel hub air tightness testing device. Background Technology

[0002] Aluminum alloy wheels are affected by multiple factors during the production process, and the wheel body is prone to micropores that are difficult to be detected by the naked eye. Therefore, it is necessary to conduct air tightness testing on aluminum alloy wheels before they are put into use, and this testing is usually performed on standard wheel parts.

[0003] Patent publication number CN214040499U relates to a wheel hub airtightness testing device, including a testing machine, a telescopic arm, a water tank, a motor, a wheel hub, and a clamp. A weight sensor is installed at the bottom of the water tank to detect the volume of water inside. A first alarm device is installed on the outer surface of the water tank and connected to the weight sensor. A liquid sensor is installed on the clamp to detect whether the clamp is in contact with water. A second alarm device is installed on the testing machine and connected to the liquid sensor. By installing a weight sensor under the water tank and connecting it to the first alarm, and by using liquid sensors on the upper and lower surfaces of the clamp to detect whether the wheel hub is completely submerged in water, the overall structure is simple, greatly improving the efficiency of checking wheel hub airtightness and avoiding the inability to fully submerge the wheel hub due to insufficient water in the tank.

[0004] In existing technology, liquid sensing devices are installed on the upper and lower end faces of the fixture to detect whether the wheel hub is completely submerged in water. However, when two holes are close together in the horizontal direction of the test piece, the air bubbles will merge together, and only one bubble can be seen, making it difficult to distinguish whether there is one or two leaks. This can easily lead to misjudgment that the test piece has only one hole. Furthermore, the test piece is removed directly from the water tank after testing, which will continuously consume the test liquid in the tank, causing frequent liquid replenishment and interruption of testing. At the same time, the floating bubbles on the top of the test liquid will adhere to the circumference of the test piece, making it difficult to distinguish whether the test piece is leaking with the naked eye. This can easily lead to misjudgment and increase the workload of re-inspection. Summary of the Invention

[0005] To address the aforementioned technical problems, this disclosure provides an airtightness testing device for aluminum alloy wheel hubs.

[0006] According to a first aspect of the present disclosure, an airtightness testing device for aluminum alloy wheel hubs is provided, comprising a support frame and a testing component. A rotating device is provided at the bottom of the support frame, and a testing frame is fixedly installed at the output end of the rotating device. A cylinder is provided at the top of the inner wall of the testing frame, and a sealing plate is fixedly installed at the output end of the cylinder. A water tank is provided at the bottom of the testing frame, and a defoaming frame is slidably installed on the inner wall of the water tank. The device also includes a testing assembly. The testing assembly includes a positioning frame, a hollow plate, a contact plate, a contact roller, a contact groove, a lowering frame, and a lowering roller. The positioning frame is fixedly installed at the bottom of the sealing plate. The testing component is disposed at the bottom of the inner wall of the testing frame. The hollow plate is fixedly installed at the top of the defoaming frame. The contact plate slides through the rear side of the hollow plate. The contact roller is rotatably installed on the rear side of the contact plate. The contact groove is opened at the top of the contact plate. The lowering frame slides through the top of the hollow plate. The lowering roller is rotatably installed on the inner wall of the lowering frame. When the lowering frame moves downward, it squeezes the contact plate and drives the contact roller to move rearward. When the contact roller moves rearward, it comes into contact with the testing surface of the testing component.

[0007] Optionally, the water tank is filled with a test liquid, and a spring is installed between the water tank and the defoaming frame. The spring can drive the defoaming frame to reset. A spring is installed between the lower pressure frame and the hollow plate. The spring can drive the lower pressure frame to reset. When the positioning frame moves downward, its inclined surface will contact the test piece and squeeze the test piece.

[0008] Optionally, the inner wall of the contact groove is set as an inclined surface. Setting the inner wall of the contact groove as an inclined surface can reduce the friction when the contact groove contacts the lower pressure frame. The bottom of the lower pressure frame is set as an arc surface. The contact roller is made of wear-resistant rubber. A spring is set between the hollow plate and the contact plate. The spring can drive the contact plate to reset. If the cylinder is overloaded, it will drive its output end to move upward to reset through the overload protection module. The upward movement of the cylinder output end will drive the sealing plate and the positioning frame to move upward to reset.

[0009] Optionally, the positioning frame is configured with inclined surfaces on both the left and right sides. By configuring the positioning frame with inclined surfaces on both the left and right sides, the frictional force when the positioning frame contacts the detection piece can be reduced. A rubber sheet is provided between the hollow plate and the contact plate. The rubber sheet can increase the sealing between the hollow plate and the contact plate. The pressing frame contacts the contact groove.

[0010] Optionally, a draining component and a defoaming component are also included. The draining component is used to reduce the loss of the test liquid, and the defoaming component is used to reduce the interference of floating bubbles on the airtightness test. The draining component includes a mounting plate, an elastic telescopic block, a delay groove, a rectangular groove, a rectangular frame, and a transport roller. The mounting plate is fixedly installed on the right side of the hollow plate at the connection point. The elastic telescopic block is fixedly installed on the left side of the mounting plate. The delay groove is opened at the top of the contact plate. The rectangular groove is opened at the bottom of the inner wall of the test frame. The rectangular frame is fixedly installed at the bottom of the inner wall of the rectangular groove. The transport roller is rotatably installed on the inner wall of the rectangular frame. The contact plate cannot move forward to reset, which prevents the contact roller from moving forward to reset. The inability of the contact roller to move forward to reset makes it difficult to directly remove the test piece after the airtightness test is completed.

[0011] Optionally, the free end of the elastic telescopic block abuts against the contact plate, the transport roller is made of wear-resistant rubber, the transport roller is used to reduce the operator's loading intensity, and the test piece will contact the transport roller and squeeze the transport roller to generate rotation when it is loaded or unloaded.

[0012] Optionally, the defoaming assembly includes a drain outlet, a sealing frame, a return spring, a limiting groove, and an elastic telescopic plate. The drain outlet is located on the left side of the water tank, the sealing frame is located on the left side of the water tank, a return spring is provided between the sealing frame and the water tank, the limiting groove is located on the rear side of the sealing frame, and the elastic telescopic plate is fixedly installed on the left side of the water tank. When the defoaming frame moves downward, it will squeeze and break the floating bubbles on the top of the detection liquid.

[0013] Optionally, the free end of the elastic telescopic plate contacts the limiting groove, and the right side of the sealing frame is made of rubber. The rubber material on the right side of the sealing frame can increase the sealing between the sealing frame and the drain outlet. The sealing frame abuts against the drain outlet. During the airtightness test, an external force accidentally touches the elastic telescopic plate, causing the elastic telescopic plate to detach from the contact with the limiting groove.

[0014] This invention provides an airtightness testing device for aluminum alloy wheel hubs. It has the following advantages: 1. In this invention, if the placement of the test piece is slightly off, the test piece is squeezed by the positioning frame to make a fine adjustment in position, thereby ensuring the top sealing effect and reducing the operator's placement accuracy requirements. If the test piece is significantly off, the cylinder overload will drive its own output end to move upward to reset through the overload protection module, thereby prompting the operator that the position of the test piece has been significantly off or tilted, thus avoiding deformation of the test piece under pressure. At the same time, it reminds the operator to correct the test piece and avoid invalid detection. The contact roller moves backward to fit against the detection surface of the test piece. When there are multiple leakage points in the horizontal direction of the test piece, the contact roller can squeeze and seal one of the holes, preventing multiple holes and bubbles from accumulating into a sheet. It can accurately distinguish between single and multiple holes in the horizontal direction, thereby improving the airtightness detection accuracy of the test piece.

[0015] 2. In this invention, when the test piece is removed, the free end of the elastic telescopic block needs to be manually pushed to the right first, thereby providing a longer draining time for the test piece. After the test piece is detected by the contact roller, it remains in a limited position and cannot automatically reset, which can extend the standing time of the test piece after immersion in water, thereby achieving sufficient draining and reducing the residue of the test piece.

[0016] 3. In this invention, the test piece will contact and squeeze the transport roller during loading and unloading, causing the roller to rotate. The rotatable transport roller can assist in moving the test piece and reduce the frictional resistance during loading and unloading, thereby reducing the operator's workload and improving the smoothness of loading and unloading to avoid scratching the bottom of the test piece.

[0017] 4. In this invention, the downward movement of the defoaming frame will squeeze and break the floating bubbles on the top of the test liquid. When the test frame moves downward, it will drive the defoaming frame to press down and break the floating bubbles. This can prevent the floating bubbles from adhering to the surface of the test piece, thereby eliminating foam interference and improving the clarity of the operator's visual observation and the accuracy of judgment.

[0018] 5. In this invention, during airtightness testing, the defoaming frame presses down to seal the drain outlet, ensuring that the water tank is in a sealed state, thereby stabilizing the test liquid level. At the same time, the downward movement of the defoaming frame aligns with the drain outlet and seals it, thus preventing accidental contact with the elastic telescopic plate that could cause the sealing frame to loosen and lead to leakage of the test liquid directly from the drain outlet, thereby ensuring the continuity of the testing operation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of this application; Figure 2 This is a schematic diagram of a half-section of the defoaming rack provided in an embodiment of this application; Figure 3 Provided for the embodiments of this application Figure 2 Enlarged structural diagram of section A; Figure 4 This is a schematic diagram of a half-section of a hollow plate provided in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of the hollow plate and the mounting plate provided in the embodiments of this application; Figure 6 This is a schematic diagram of the structure of the water tank and defoaming frame provided in the embodiments of this application; Figure 7 Provided for the embodiments of this application Figure 6 Enlarged structural diagram of section B; Figure 8 This is a schematic diagram of the limiting groove and elastic telescopic plate provided in the embodiments of this application.

[0020] Figure label: 1. Support frame; 2. Rotating device; 3. Detection frame; 4. Cylinder; 5. Sealing plate; 6. Positioning frame; 7. Detection piece; 8. Hollow plate; 9. Contact plate; 10. Contact roller; 11. Contact groove; 12. Lower pressure frame; 13. Lower pressure roller; 141. Mounting plate; 142. Elastic telescopic block; 143. Delay groove; 144. Rectangular groove; 145. Rectangular frame; 146. Transport roller; 151. Water tank; 152. Defoaming frame; 153. Drain outlet; 154. Sealing frame; 155. Return spring; 156. Limiting groove; 157. Elastic telescopic plate. Detailed Implementation

[0021] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0022] Please see Figure 1 - Figure 8 One embodiment of the present invention is: an aluminum alloy wheel hub airtightness testing device, comprising a support frame 1 and a testing component 7. A rotating device 2 is provided at the bottom of the support frame 1, and a testing frame 3 is fixedly installed at the output end of the rotating device 2. A cylinder 4 is provided at the top of the inner wall of the testing frame 3, and a sealing plate 5 is fixedly installed at the output end of the cylinder 4. A water tank 151 is provided at the bottom of the testing frame 3, and a defoaming frame 152 is slidably installed on the inner wall of the water tank 151. The device also includes a testing assembly; the testing assembly includes a positioning frame 6, a hollow plate 8, a contact plate 9, a contact roller 10, a contact groove 11, a pressing frame 12, and a pressing roller 13. The positioning frame 6 is fixedly installed at the bottom of the sealing plate 5, and the testing component 7 is provided at the bottom of the testing frame 7. At the bottom of the inner wall of the frame 3, the hollow plate 8 is fixedly installed on the top of the defoaming frame 152. The contact plate 9 slides through the rear side of the hollow plate 8. The contact roller 10 is rotatably installed on the rear side of the contact plate 9. The contact groove 11 is opened on the top of the contact plate 9. The lower pressure frame 12 slides through the top of the hollow plate 8. The lower pressure roller 13 is rotatably installed on the inner wall of the lower pressure frame 12. When the contact roller 10 moves to the rear, it will fit against the detection surface of the test piece 7. When multiple leakage points appear in the horizontal direction of the test piece 7, the contact roller 10 can squeeze and seal one of the holes, preventing multiple holes and bubbles from accumulating into a sheet. It can accurately distinguish between single and multiple holes in the horizontal direction, thereby improving the airtightness detection accuracy of the test piece 7.

[0023] The water tank 151 contains a test liquid. A spring 1 is installed between the water tank 151 and the defoaming frame 152. The spring 1 can drive the defoaming frame 152 to reset. A spring 2 is installed between the lower pressure frame 12 and the hollow plate 8. The spring 2 can drive the lower pressure frame 12 to reset. When the positioning frame 6 moves downward, its inclined surface will contact the test piece 7 and squeeze the test piece 7. The test piece 7 is squeezed by the positioning frame 6 and its position is slightly adjusted, thereby ensuring the top sealing effect.

[0024] The inner wall of the contact groove 11 is set as an inclined surface. The inclined surface of the inner wall of the contact groove 11 can reduce the friction when the contact groove 11 contacts the lower pressure frame 12. The bottom of the lower pressure frame 12 is set as an arc surface. The contact roller 10 is made of wear-resistant rubber. A spring is set between the hollow plate 8 and the contact plate 9. The spring can drive the contact plate 9 to reset. If the cylinder 4 is overloaded, it will drive its output end to move upward to reset through the overload protection module. The upward movement of the output end of the cylinder 4 will drive the sealing plate 5 and the positioning frame 6 to move upward to reset. If the detection element 7 is significantly deviated, the cylinder 4 will drive its output end to move upward to reset through the overload protection module, thereby prompting the operator that the position of the detection element 7 has been significantly deviated or tilted, thus avoiding the deformation of the detection element 7 under pressure.

[0025] The positioning frame 6 has inclined surfaces on both sides. The inclined surfaces on both sides of the positioning frame 6 can reduce the friction when the positioning frame 6 contacts the test piece 7. A rubber sheet is provided between the hollow plate 8 and the contact plate 9. The rubber sheet can increase the sealing between the hollow plate 8 and the contact plate 9. The lower pressure frame 12 contacts the contact groove 11. The bottom of the test frame 3 is provided with rollers. The rollers are used to reduce the friction between the test frame 3 and the defoaming frame 152 when the test frame 3 rotates.

[0026] In this embodiment, the cylinder 4 is equipped with an overload protection module, the water tank 151 is equipped with a hydraulic device at the bottom, and the sealing plate 5 is equipped with an air filling device at the top, which penetrates the upper and lower walls of the sealing plate 5. After the test piece 7 is placed at the bottom of the inner wall of the test frame 3, the cylinder 4 is started to drive the sealing plate 5 to move downward. The downward movement of the sealing plate 5 will drive the positioning frame 6 to move downward. If the placement position of the test piece 7 is slightly off, the downward movement of the positioning frame 6 will cause its inclined surface to contact the test piece 7 and squeeze the test piece 7. The test piece 7 is squeezed by the positioning frame 6 to make a slight adjustment in position, and the positioning frame 6 can enter the interior of the test piece 7, so that the sealing plate 5 seals the top of the test piece 7. If the test piece 7 is significantly off; Alternatively, if the test piece 7 is placed on the inner wall of the test frame 3 and is pushed up by debris, causing the test piece 7 to tilt, the positioning frame 6 will continue to move downward, which will squeeze the test piece 7 and cause the cylinder 4 to overload. The cylinder 4 will be overloaded and its output end will be driven to move upward to reset through the overload protection module. The upward movement of the output end of the cylinder 4 will drive the sealing plate 5 and the positioning frame 6 to move upward to reset, thereby prompting the operator that the position of the test piece 7 has shifted significantly or tilted. When the test piece 7 is centered, the sealing plate 5 will move downward and seal the top of the test piece 7. After the test piece 7 is sealed, the hydraulic equipment will be started to drive the water tank 151 to move upward. When the water tank 151 moves upward, it will immerse the test frame 3 and the test piece 7 in the test liquid. At the same time, the rotating device 2 is started to rotate, which will drive the test frame 3 to rotate. The rotation of the test frame 3 will drive the test piece 7 to rotate. Simultaneously, the gas filling device is started to fill the inside of the test piece 7 with gas. The operator can visually observe from the front of the test frame 3. If there are holes on the circumference of the test piece 7 that affect the sealing, the gas inside the test piece 7 will overflow through the holes and generate a large number of bubbles, which can be observed by the operator. At the same time, when the sealing plate 5 moves downward to seal the test piece 7, the sealing plate 5 will contact the lower pressure roller 13 and squeeze the lower pressure roller 13. The lower pressure roller 13 is squeezed by the sealing plate 5, which drives the lower pressure frame 12 to move downward. The downward movement of the pressure frame 12 compresses the second spring, causing it to deform and store force. At the same time, the downward movement of the pressure frame 12 compresses the contact plate 9, causing the contact roller 10 to move backward. The contact roller 10 moves backward and comes into contact with the detection surface of the test piece 7. This can compress and seal one of the holes when multiple leaks occur, thus preventing the bubbles from merging into a foamy water stain when two leaking holes are very close together. Only the entire bubble can be seen, making it impossible to determine whether it is a single damage or two independent leaks. When testing the next test piece, the rotating device will drive the test frame 3 to rotate in the opposite direction.

[0027] Please see Figure 1 - Figure 8 Based on the above embodiments, another embodiment of the present invention further includes a draining component and a defoaming component. The draining component is used to reduce the loss of detection liquid, and the defoaming component is used to reduce the interference of floating bubbles on airtightness detection. The draining component includes a mounting plate 141, an elastic telescopic block 142, a delay groove 143, a rectangular groove 144, a rectangular frame 145, and a transport roller 146. The mounting plate 141 is fixedly installed on the right side of the hollow plate 8 at the connection point, and the elastic telescopic block 142 is fixedly installed on the left side of the mounting plate 141. The delay groove 143 is opened on the top of the contact plate 9, the rectangular groove 144 is opened on the bottom of the inner wall of the detection frame 3, the rectangular frame 145 is fixedly installed on the bottom of the inner wall of the rectangular groove 144, and the transport roller 146 is rotatably installed on the inner wall of the rectangular frame 145. After being detected by the contact roller 10, it remains in a limited position and cannot automatically reset, which can extend the standing time of the detection piece 7 after immersion in water, thereby achieving sufficient draining and reducing the residue of detection liquid.

[0028] The free end of the elastic telescopic block 142 abuts against the contact plate 9. The conveyor roller 146 is made of wear-resistant rubber. The conveyor roller 146 is used to reduce the operator's loading intensity. When the test piece 7 is loaded or unloaded, it will contact the conveyor roller 146 and squeeze the conveyor roller 146 to generate rotation. The rotatable conveyor roller 146 can assist in moving the test piece 7 and reduce the frictional resistance during the loading and unloading process of the test piece 7, thereby reducing the operator's operating load and improving the smoothness of loading and unloading to avoid scratching the bottom of the test piece 7.

[0029] The defoaming assembly includes a drain outlet 153, a sealing frame 154, a return spring 155, a limiting groove 156, and an elastic telescopic plate 157. The drain outlet 153 is located on the left side of the water tank 151, the sealing frame 154 is located on the left side of the water tank 151, and a return spring 155 is provided between the sealing frame 154 and the water tank 151. The limiting groove 156 is located on the rear side of the sealing frame 154, and the elastic telescopic plate 157 is fixedly installed on the left side of the water tank 151. When the detection frame 3 moves down, it drives the defoaming frame 152 to press down and break the floating bubbles, which can prevent the floating bubbles from adhering to the surface of the detection piece 7, thereby eliminating foam interference and improving the clarity of the operator's visual observation and the accuracy of judgment.

[0030] The free end of the elastic telescopic plate 157 contacts the limiting groove 156. The right side of the sealing frame 154 is made of rubber, which increases the sealing between the sealing frame 154 and the drain outlet 153. The sealing frame 154 and the drain outlet 153 are in contact. During the airtightness test, if the elastic telescopic plate 157 is accidentally touched by external force, it will detach from the limiting groove 156. During the airtightness test, the defoaming frame 152 presses down to seal the drain outlet 153, which can ensure that the water tank 151 is in a sealed state, thereby stabilizing the test liquid level. When the defoaming frame 152 moves downward, it will align with the drain outlet 153 and seal the drain outlet 153, thereby preventing the sealing frame 154 from loosening due to accidental contact with the elastic telescopic plate 157, which would cause the test liquid to leak directly from the drain outlet 153, thus ensuring the continuity of the test operation.

[0031] In this embodiment, when the contact plate 9 moves backward, the delay groove 143 aligns with the free end of the elastic telescopic block 142. After the free end of the elastic telescopic block 142 aligns with the delay groove 143, the free end of the elastic telescopic block 142 moves to the left under its own elastic force and contacts the delay groove 143, thus limiting the contact plate 9. The contact plate 9 is limited by the elastic telescopic block 142 and cannot move forward to reset. The inability of the contact plate 9 to move forward to reset prevents the contact roller 10 from moving forward to reset. The inability of the contact roller 10 to move forward and reset makes it difficult to remove the test piece 7 directly after the airtightness test. When removing the test piece 7, it is necessary to manually push the free end of the elastic telescopic block 142 to the right. The movement of the free end of the elastic telescopic block 142 to the right will disengage it from the contact with the delay groove 143 and release the limit on the contact plate 9. After the limit on the contact plate 9 is released, the contact plate 9 moves forward and resets under the elastic force of the spring 3. The forward reset of the contact plate 9 will drive the contact roller 10 to move and reset. The movement and reset of the contact roller 10 allows the operator to remove the test piece 7, thereby providing the test piece 7 with a longer draining time. When the test piece 7 is loaded or unloaded, it will contact the transport roller 146 and squeeze the transport roller 146 to generate rotation. The rotation of the transport roller 146 can help reduce the intensity of the operator's loading and unloading of the test piece 7.

[0032] The downward movement of the detection frame 3 will cause the defoaming frame 152 to move downward. The downward movement of the defoaming frame 152 will compress the spring 1, causing it to deform and store force. At the same time, the downward movement of the defoaming frame 152 will compress the floating bubbles on the top of the detection liquid and crush them, thereby preventing the floating bubbles from adhering to the circumferential surface of the detection piece 7, increasing the difficulty of observation for the operator, and causing misjudgment. Furthermore, the downward movement of the defoaming frame 152 will align with the drain outlet 153 and seal the drain outlet 153. During the airtightness test, the defoaming frame 152 moves downward to seal the drain outlet 153. If an external force accidentally touches the elastic telescopic plate 157, causing the elastic telescopic plate 157 to detach from the contact with the limiting groove 156, the defoaming frame 152 will continue to seal the drain outlet 153 after the elastic telescopic plate 157 detaches from the contact with the limiting groove 156. This prevents the sealing frame 154 from loosening and causing the test liquid to leak directly from the drain outlet 153, thus interrupting the airtightness test.

[0033] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and application concept of this application, should be included within the scope of protection of this application.

Claims

1. An airtightness testing device for aluminum alloy wheel hubs, comprising a support frame (1) and a testing component (7), wherein a rotating device (2) is provided at the bottom of the support frame (1), a testing frame (3) is fixedly installed at the output end of the rotating device (2), a cylinder (4) is provided at the top of the inner wall of the testing frame (3), a sealing plate (5) is fixedly installed at the output end of the cylinder (4), a water tank (151) is provided at the bottom of the testing frame (3), and a defoaming frame (152) is slidably installed on the inner wall of the water tank (151), characterized in that, It also includes a detection component, a drainage component, and a defoaming component; The detection assembly includes a positioning frame (6), a hollow plate (8), a contact plate (9), a contact roller (10), a contact groove (11), a lower pressure frame (12), and a lower pressure roller (13). The positioning frame (6) is fixedly installed at the bottom of the sealing plate (5). The detection component (7) is set at the bottom of the inner wall of the detection frame (3). The hollow plate (8) is fixedly installed at the top of the defoaming frame (152). The contact plate (9) slides through the rear side of the hollow plate (8). The contact roller (10) is rotatably installed at the rear side of the contact plate (9). The contact groove (11) is opened at the top of the contact plate (9). The lower pressure frame (12) slides through the top of the hollow plate (8). The lower pressure roller (13) is rotatably installed on the inner wall of the lower pressure frame (12).

2. The aluminum alloy wheel hub airtightness testing equipment according to claim 1, characterized in that, The water tank (151) is filled with a test liquid. A spring is installed between the water tank (151) and the defoaming frame (152). A spring is installed between the pressure frame (12) and the hollow plate (8).

3. The aluminum alloy wheel hub airtightness testing equipment according to claim 2, characterized in that, The inner wall of the contact groove (11) is set as an inclined surface, the bottom of the lower pressure frame (12) is set as an arc surface, the contact roller (10) is made of wear-resistant rubber, and a spring is provided between the hollow plate (8) and the contact plate (9).

4. The aluminum alloy wheel hub airtightness testing equipment according to claim 3, characterized in that, The positioning frame (6) is set with inclined surfaces on both the left and right sides. A rubber sheet is provided between the hollow plate (8) and the contact plate (9). The pressure frame (12) is in contact with the contact groove (11). The draining component is used to reduce the loss of detection liquid. The defoaming component is used to reduce the interference of floating bubbles with air tightness detection.

5. The aluminum alloy wheel hub airtightness testing equipment according to claim 4, characterized in that, The drain assembly includes a mounting plate (141), an elastic telescopic block (142), a delay groove (143), a rectangular groove (144), a rectangular frame (145), and a transport roller (146). The mounting plate (141) is fixedly installed on the right side of the hollow plate (8) at the connection point. The elastic telescopic block (142) is fixedly installed on the left side of the mounting plate (141). The delay groove (143) is opened on the top of the contact plate (9). The rectangular groove (144) is opened on the bottom of the inner wall of the detection frame (3). The rectangular frame (145) is fixedly installed on the bottom of the inner wall of the rectangular groove (144). The transport roller (146) is rotatably installed on the inner wall of the rectangular frame (145).

6. The aluminum alloy wheel hub airtightness testing equipment according to claim 5, characterized in that, The free end of the elastic telescopic block (142) abuts against the contact plate (9), and the transport roller (146) is made of wear-resistant rubber. The transport roller (146) is used to reduce the operator's loading intensity.

7. The aluminum alloy wheel hub airtightness testing equipment according to claim 6, characterized in that, The defoaming assembly includes a drain outlet (153), a sealing frame (154), a return spring (155), a limiting groove (156), and an elastic telescopic plate (157). The drain outlet (153) is located on the left side of the water tank (151). The sealing frame (154) is located on the left side of the water tank (151). A return spring (155) is provided between the sealing frame (154) and the water tank (151). The limiting groove (156) is located on the rear side of the sealing frame (154). The elastic telescopic plate (157) is fixedly installed on the left side of the water tank (151).

8. The aluminum alloy wheel hub airtightness testing equipment according to claim 7, characterized in that, The free end of the elastic telescopic plate (157) is in contact with the limiting groove (156), the right side of the sealing frame (154) is made of rubber, and the sealing frame (154) is in contact with the drain outlet (153).

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