A hub airtightness detection and processing device

Abstract

The present invention discloses a hub airtightness detection and processing device, which relates to the technical field of airtightness detection. It includes a fixed frame, and two pushing mechanisms are installed on the upper part of the fixed frame. The ends of the two pushing mechanisms are fixedly connected with airtight frames. An ultrasonic atomizer is installed on the surface of one airtight frame, and a telescopic mechanism is fixedly connected to the inner side of the other airtight frame. The end of the telescopic mechanism is fixedly connected with an expansion mechanism, and a plurality of heating mechanisms are installed on the surface of the expansion mechanism. In the present invention, the hub and the sealed space are heated by the heating mechanism to make the temperature higher than the dew point, avoiding the condensation of water vapor from the root, eliminating the interference of the water film on visual inspection and laser detection, and improving the accuracy of leak point identification. The gear-rack transmission of the expansion mechanism ensures that multiple heating units synchronously tension the hub, realizing concentric coaxial positioning. Cooperating with the elastic sealing ring of the airtight frame, the sealing performance is improved, and the internal pressure stability during the detection process is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of airtightness detection, and particularly to a processing device for detecting the airtightness of a wheel hub. Background Art

[0002] During the production and processing of wheel hubs, defects such as casting pores, shrinkage porosity, insufficient machining accuracy, or heat treatment cracks may occur in the production process. These defects can cause the wheel hub and the tire to be poorly sealed and leak air, which in turn can lead to serious safety hazards such as unstable tire pressure, vehicle deviation, and even tire blowout, threatening driving safety. Therefore, after the production and processing of the wheel hub, it is necessary to use a processing device for detecting the airtightness of the wheel hub to detect its airtightness.

[0003] For example, the patent with publication number CN116202697B discloses an airtightness detection device for processing aluminum alloy wheel hubs, including a detection vertical platform, an airtightness frame, a support frame, a bottom plate, an airtightness fog leakage prevention detection mechanism, and a wheel hub surface surrounding detection mechanism. The airtightness frames are symmetrically arranged on both sides of the detection vertical platform. The support frame is arranged at one end of the airtightness frame away from the detection vertical platform. The bottom plate is arranged on the bottom wall of the support frame, and the bottom plate is arranged on the side wall of the detection vertical platform. The wheel hub surface surrounding detection mechanism is arranged on the detection vertical platform. The airtightness fog leakage prevention detection mechanism includes a sealing test mechanism and a fog intrusion mechanism.

[0004] However, in the prior art, after the water mist enters the airtight cover in the wheel hub airtightness detection device, the water mist generated by the ultrasonic atomizer contains a large amount of water vapor. The internal detection structure has a lot of metal structures, and at the same time, the wheel hub itself is also a metal structure. Due to the high thermal conductivity of the metal, the surface temperature is easily lower than the dew point temperature of the water vapor, resulting in the condensation of the water vapor into water dew, which will condense on the internal structure and the surface of the wheel hub. When the condensed water flows along the inner wall of the airtight cover, it will form an interfering water film on the surface of the wheel hub, covering the trace moisture leaking from the leak holes, making it difficult for traditional visual inspection to distinguish normal condensed water from water seepage at the leak points. For the laser detection module, the water film will refract or absorb the beam of the test laser lamp, resulting in a weakening of the scattering phenomenon when the laser passes through the leak hole, causing the fine leak holes to be missed. Summary of the Invention

[0005] The purpose of the present invention is to provide a processing device for detecting the airtightness of a wheel hub to solve the problems raised in the above background art.

[0006] To achieve the above object, the present invention provides the following technical solution: A hub airtightness detection and processing device, including a fixed frame, two pushing mechanisms are installed on the upper part of the fixed frame, airtight frames are fixedly connected to the ends of the two pushing mechanisms, an ultrasonic atomizer is installed on the surface of one airtight frame, a telescopic mechanism is fixedly connected to the inner side of the other airtight frame, an expansion mechanism is fixedly connected to the end of the telescopic mechanism, a plurality of heating mechanisms are installed on the surface of the expansion mechanism, and the expansion mechanism is used to expand or contract between the plurality of heating mechanisms. The heating mechanism includes a base, and an electric heating component is fixedly connected to the upper part of the base. The electric heating component is used to heat the space between the two airtight frames and the hub.

[0007] A regulating mechanism is fixedly connected to the side of the fixed frame, and a detection mechanism is fixedly connected to the surface of the regulating mechanism. The detection mechanism includes two semi-circular sealing covers, and a detection component is installed inside the sealing cover. The regulating mechanism is used to adjust the position of the detection mechanism.

[0008] A pressurizing mechanism is installed between the airtight frame and the detection mechanism. The pressurizing mechanism is used to evacuate the space between the detection mechanism and the outer surface of the hub, and the pressurizing mechanism is used to pressurize the space between the airtight frame and the inner surface of the hub.

[0009] Preferably, the pressurizing mechanism includes an air compressor. The intake end of the air compressor is fixedly connected to a first connecting pipe. The first connecting pipe is fixedly connected to the sealing cover, and a first control valve is installed on the surface of the first connecting pipe. And a second connecting pipe is fixedly connected to the surface of the first connecting pipe, a second control valve is installed on the surface of the second connecting pipe. The outlet end of the air compressor is fixedly connected to a third connecting pipe. The third connecting pipe is fixedly connected to the airtight frame, and a third control valve is fixedly connected to the surface of the third connecting pipe.

[0010] Preferably, a plurality of detection components are annularly arranged inside the sealing cover. The detection component is composed of a semiconductor laser, an industrial camera and a humidity sensor.

[0011] Preferably, the telescopic mechanism includes a telescopic rod and a spring. The telescopic rod is fixedly connected to the airtight frame and is fixedly connected to the expansion mechanism. The spring is fixedly connected to the airtight frame and is fixedly connected to the expansion mechanism.

[0012] Preferably, the expansion mechanism includes a first mounting frame, a gear and a rack. An internal gear ring is slidably connected to the inside of the first mounting frame, and an oil cylinder is installed on the outside of the first mounting frame. One end of the oil cylinder is movably connected to the internal gear ring. The gear is rotatably connected to the first mounting frame. The rack is slidably connected to the first mounting frame and meshes with the gear. A connecting plate is fixedly connected to the side of the rack, and the connecting plate is fixedly connected to the base.

[0013] Preferably, the regulating mechanism includes a connecting frame. A horizontal moving component is fixedly connected to the surface of the connecting frame. A vertical moving component is installed on the moving end of the horizontal moving component. The moving end of the vertical moving component is fixedly connected to the sealing cover.

[0014] Preferably, sealing strips are fixedly connected to both the inner side and the end of the sealing cover. The sealing strip on the inner side of the sealing cover is used to seal the sealing cover and the outer surface of the hub, and the sealing adjustment at the end of the sealing cover is used to seal between two sealing covers.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. In the present invention, the hub and the sealing space are heated by the heating mechanism to make the temperature higher than the dew point, thus avoiding the condensation of water vapor at the source, eliminating the interference of the water film on visual inspection and laser inspection, improving the accuracy of leak point identification. The gear-rack transmission of the expansion mechanism ensures that multiple heating units synchronously tension the hub, realizing concentric coaxial positioning. Cooperating with the elastic sealing ring of the airtight frame, the sealing performance is improved, ensuring the stability of the internal pressure during the detection process. The arc-shaped heating plate fits the inner wall of the hub to achieve rapid and uniform heating. The temperature sensor real-time feedbacks temperature data to ensure that the heating effect is controllable, shortening the detection cycle. The fan-shaped laser surface of the detection component covers the outer side of the hub, and the high-sensitivity industrial camera captures the scattered light spots of the leak holes. Through the image processing algorithm, the fine leak points are accurately positioned, solving the problem of easy missed detection of small leak holes in traditional detection. Each mechanism is linked through the control system to realize the automation of hub positioning, heating, sealing, pressurization and detection, reducing manual intervention, improving the detection efficiency and stability, and adapting to the needs of large-scale industrial production.

[0017] 2. In the present invention, when the second control valve is closed, the air compressor is started to extract the air between the sealing cover and the hub through the second connecting pipe to form a vacuum state. At the same time, the inner space between the airtight frame and the hub is pressurized through the third connecting pipe, so that a large pressure difference is formed between the inner and outer sides of the hub, significantly improving the fog leakage speed at the leak point. When there is a leak point in the hub, the high-pressure fog on the inner side quickly sprays through the leak hole to the vacuum space of the outer sealing cover under the action of the pressure difference, forming a high-speed fog flow. The semiconductor laser of the detection component cooperates with the fan-shaped beam expander to generate strong Mie scattering at the leak hole, and the high-sensitivity industrial camera captures clear scattered light spots, avoiding the blurring of the light spots caused by the refraction of the water film.

[0018] 3. In the present invention, a pressure difference space inside and outside the hub is constructed through the second connecting pipe and the third connecting pipe, so that the fog spraying speed at the leak point is increased and the intensity of the scattered light spot is enhanced, solving the problem that the weak leak point signal is easily submerged by noise in traditional atmospheric pressure detection. The humidity sensor integrated in the sealing cover can real-time capture the humidity mutation caused by the leakage of the leak hole, forming a "double-threshold" detection logic with the laser scattering signal, significantly improving the detection reliability.

[0019] 4. In the present invention, the curved surface fitting design of the sealing cover in cooperation with the inner sealing rubber strip forms a fully enclosed optical detection darkroom, which improves the signal-to-noise ratio of the scattered light spots captured by the industrial camera, thereby improving the leakage point positioning accuracy. The preheating temperature of the hub is utilized by the heating mechanism, and the space temperature inside the sealing cover is maintained higher than the fog dew point temperature through heat conduction, avoiding fog condensation caused by environmental temperature fluctuations during the detection process, ensuring the stability of the detection signal of the humidity sensor, and preventing the sealing failure caused by the low-temperature hardening of the sealing rubber strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. 6 is a first three-dimensional structural schematic diagram of a hub airtightness detection and processing device of the present invention;

[0021] Figure 2 FIG. 7 is a second three-dimensional structural schematic diagram of a hub airtightness detection and processing device of the present invention;

[0022] Figure 3 FIG. 8 is a side view structural schematic diagram of a hub airtightness detection and processing device of the present invention;

[0023] Figure 4 FIG. 9 is a three-dimensional structural schematic diagram of an airtightness frame in a hub airtightness detection and processing device of the present invention;

[0024] Figure 5 FIG. 10 is a three-dimensional structural schematic diagram of a telescopic mechanism in a hub airtightness detection and processing device of the present invention;

[0025] Figure 6 FIG. 11 is an unfolded three-dimensional structural schematic diagram of an expansion mechanism in a hub airtightness detection and processing device of the present invention;

[0026] Figure 7 FIG. 12 is a three-dimensional structural schematic diagram of a pressurizing mechanism in a hub airtightness detection and processing device of the present invention;

[0027] Figure 8 FIG. 13 is a three-dimensional structural schematic diagram of an adjustment mechanism in a hub airtightness detection and processing device of the present invention;

[0028] Figure 9 FIG. 14 is a three-dimensional structural schematic diagram of a detection mechanism in a hub airtightness detection and processing device of the present invention.

[0029] In the figure: 1. Fixed frame; 2. Pushing mechanism; 3. Airtight frame; 4. Ultrasonic atomizer; 5. Expansion mechanism; 51. First mounting frame; 52. Internal gear ring; 53. Oil cylinder; 54. Gear; 55. Rack; 56. Connecting plate; 6. Heating mechanism; 61. Base; 62. Electric heating component; 7. Adjusting mechanism; 71. Connecting frame; 72. Horizontal moving component; 73. Vertical moving component; 8. Detection mechanism; 81. Sealing cover; 82. Detection component; 9. Pressurizing mechanism; 91. Air compressor; 92. First connecting pipe; 93. First control valve; 94. Second connecting pipe; 95. Second control valve; 96. Third connecting pipe; 97. Third control valve; 10. Telescopic mechanism; 101. Telescopic rod; 102. Spring. Specific implementation mode

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] Example 1: Refer to Figures 1-9 As shown in the figure: A hub airtightness detection and processing device includes a fixed frame 1. Two pushing mechanisms 2 are installed on the upper part of the fixed frame 1. The ends of the two pushing mechanisms 2 are fixedly connected with airtight frames 3. An ultrasonic atomizer 4 is installed on the surface of one airtight frame 3. A telescopic mechanism 10 is fixedly connected to the inner side of the other airtight frame 3. The end of the telescopic mechanism 10 is fixedly connected with an expansion mechanism 5. A plurality of heating mechanisms 6 are installed on the surface of the expansion mechanism 5, and the expansion mechanism 5 is used to expand or contract between the plurality of heating mechanisms 6. The heating mechanism 6 includes a base 61, and an electric heating component 62 is fixedly connected to the upper part of the base 61. The electric heating component 62 is used to heat the space between the two airtight frames 3 and the hub. A pressurizing mechanism 9 is installed between the airtight frame 3 and the detection mechanism 8. The pressurizing mechanism 9 is used to evacuate the space between the detection mechanism 8 and the outer surface of the hub, and the pressurizing mechanism 9 is used to pressurize the space between the airtight frame 3 and the inner surface of the hub.

[0032] The telescopic mechanism 10 includes a telescopic rod 101 and a spring 102. The telescopic rod 101 is fixedly connected to the airtight frame 3, and the telescopic rod 101 is fixedly connected to the expansion mechanism 5. The spring 102 is fixedly connected to the airtight frame 3, and the spring 102 is fixedly connected to the expansion mechanism 5. The expansion mechanism 5 includes a first mounting frame 51, a gear 54, and a rack 55. An internal gear ring 52 is slidably connected to the inner side of the first mounting frame 51, and an oil cylinder 53 is installed on the outer side of the first mounting frame 51. One end of the oil cylinder 53 is movably connected to the internal gear ring 52. The gear 54 is rotatably connected to the first mounting frame 51. The rack 55 is slidably connected to the first mounting frame 51, and the rack 55 meshes with the gear 54. A connecting plate 56 is fixedly connected to the side surface of the rack 55, and the connecting plate 56 is fixedly connected to the base 61.

[0033] In this embodiment, the hub is sleeved on the surface of the heating mechanism 6. The oil cylinder 53 drives the internal gear ring 52 to rotate along the first mounting frame 51. At this time, the gear 54 drives the rack 55 to slide along the first mounting frame 51. Driven by the rack 55, the connecting plate 56 drives the heating mechanism 6 to expand outwards. At this time, multiple heating mechanisms 6 expand outwards synchronously to form a ring to tighten the inner side of the hub. At the same time, the hub is heated by the electrothermal component 62. Tightening the inner side of the hub by the heating mechanism 6 plays a clamping role, and at the same time ensures that the heating surface on one side of the electrothermal component 62 is attached to the inner wall of the hub, so that the hub can be heated quickly and evenly. It can also ensure that the center of the hub and the center of the airtight frame 3 are on the same axis, so that the airtight frame 3 can accurately seal both sides of the hub;

[0034] After the heating mechanism 6 completes the tensioning and clamping fixation of the hub, the pushing mechanism 2 is used to push the airtight frames 3 to approach each other, and the airtight frames 3 seal both sides of the hub. When the heating mechanism 6 heats the hub and the space between the airtight frame 3 and the hub, the expansion mechanism 5 retracts and closes multiple heating mechanisms 6 to separate the side surface of the electrothermal component 62 from the hub, avoiding interference with the detection caused by the electrothermal component 62 being attached to the surface of the hub. The heat of the hub itself and the heat between it and the airtight frame 3 will cause the rubber at the sealing joint between the airtight frame 3 and the hub surface to expand, thereby improving the sealing performance;

[0035] The ultrasonic nebulizer 4 is used to inject water mist into the inner side of the hub. At the same time, the pressurizing mechanism 9 pressurizes the inner side of the hub. During the pressurization process, the outer side of the hub is detected by the detection component 82. The semiconductor laser and the industrial camera are combined, and the laser line light source uses a fan-shaped beam expander. When there is a leak in the hub, the leaked mist, water mist or aerosol water droplets will generate Mie scattering in the laser beam when passing through the leak hole. The scattered light spot is captured by a high-sensitivity camera to locate the leak point, and the leak point coordinates are marked through image processing algorithms such as threshold segmentation + connected component analysis;

[0036] The driving mechanism 2 can be composed of a hydraulic cylinder driving a sliding bracket, or it can be composed of a linear guide rail and a driving motor. A slider is slidably connected to the linear guide rail. The output shaft of the driving motor is threadedly connected to the slider through a lead screw. A mounting plate is fixedly installed on the slider, and the airtight frame 3 is fixed to the mounting plate. By driving the lead screw to rotate with the driving motor, the slider slides along the linear guide rail to achieve the approaching or separating movement of the airtight frame 3.

[0037] The heating mechanism 6 is composed of multiple heating units evenly distributed circumferentially. Each unit includes a base 61 and an electric heating component 62. One end of the base 61 is fixed to the connecting plate 56. One end of the electric heating component 62 is an arc-shaped heating plate, and a temperature sensor is arranged on the outer side of the electric heating component 62. When the expanding mechanism 5 operates, the connecting plate 56 drives the electric heating component 62 to expand outwards to form a ring. The inner side of the heating plate is attached to the inner wall of the wheel hub, realizing tension clamping and rapid and uniform heating. At the same time, it ensures that the center of the wheel hub is coaxial with the center of the airtight frame 3, facilitating the precise sealing of the airtight frame 3.

[0038] The wheel hub and the sealing space are heated by the heating mechanism 6 to make the temperature higher than the dew point, avoiding the condensation of water vapor from the source, eliminating the interference of the water film on visual inspection and laser inspection, improving the accuracy of leak point identification. The gear 54 and the rack 55 of the expanding mechanism 5 ensure the synchronous tensioning of the wheel hub by multiple heating units, realizing coaxial positioning of the centers. Cooperating with the elastic sealing ring of the airtight frame 3, it improves the sealing performance and ensures the stability of the internal pressure during the detection process.

[0039] The arc-shaped heating plate is attached to the inner wall of the wheel hub to achieve rapid and uniform heating; the temperature sensor real-time feeds back temperature data to ensure that the heating effect is controllable and shortens the detection cycle.

[0040] The fan-shaped laser surface of the detection component 82 covers the outer side of the wheel hub. The high-sensitivity industrial camera captures the scattered light spots of the leak holes, and accurately locates the fine leak points through the image processing algorithm, solving the problem of easy missed detection of small leak holes in traditional detection. Each mechanism is linked through the control system to realize the automation of wheel hub positioning, heating, sealing, pressurization and detection, reducing manual intervention, improving the detection efficiency and stability, and adapting to the needs of large-scale industrial production.

[0041] Embodiment 2: According to Figures 1-9 As shown, the pressurizing mechanism 9 includes an air compressor 91. The intake end of the air compressor 91 is fixedly connected with a first connecting pipe 92. The first connecting pipe 92 is fixedly connected with the sealing cover 81, and a first control valve 93 is installed on the surface of the first connecting pipe 92. And a second connecting pipe 94 is fixedly connected to the surface of the first connecting pipe 92. A second control valve 95 is installed on the surface of the second connecting pipe 94. The outlet end of the air compressor 91 is fixedly connected with a third connecting pipe 96. The third connecting pipe 96 is fixedly connected with the airtight frame 3, and a third control valve 97 is fixedly connected to the surface of the third connecting pipe 96;

[0042] A regulating mechanism 7 is fixedly connected to the side of the fixing bracket 1, and a detecting mechanism 8 is fixedly connected to the surface of the regulating mechanism 7. The detecting mechanism 8 includes two semi-circular sealing covers 81. A detecting component 82 is installed inside the sealing cover 81. The regulating mechanism 7 is used to adjust the position of the detecting mechanism 8. The regulating mechanism 7 includes a connecting frame 71. A horizontal moving component 72 is fixedly connected to the surface of the connecting frame 71. A vertical moving component 73 is installed at the moving end of the horizontal moving component 72. The moving end of the vertical moving component 73 is fixedly connected to the sealing cover 81. A plurality of detecting components 82 are annularly arranged inside the sealing cover 81. The detecting component 82 is composed of a semiconductor laser, an industrial camera, and a humidity sensor. Sealing strips are fixedly connected to the inner side and the end of the sealing cover 81. The sealing strip on the inner side of the sealing cover 81 is used to seal the sealing cover 81 and the outer surface of the wheel hub. The sealing adjustment at the end of the sealing cover 81 is used to seal between the two sealing covers 81.

[0043] In this embodiment, the servo motor of the horizontal moving component 72 drives the transmission lead screw, so that the sliding base drives the sealing cover 81 to move horizontally, and the wheel hub is accurately positioned between the two sealing covers 81. Subsequently, the air cylinder of the vertical moving component 73 pushes the sealing cover 81 to close vertically, and the inner sealing rubber strip is closely attached to the outer curved surface of the wheel hub to form an independent sealed detection space.

[0044] Close the second control valve 95, start the air compressor 91 to extract the air between the sealing cover 81 and the wheel hub through the second connecting pipe 94 to form a vacuum state (the vacuum degree can reach -90 kPa); at the same time, pressurize the inner space between the airtight frame 3 and the wheel hub through the third connecting pipe 96 (the pressure range is 0.5 - 1.0 MPa), so that a pressure difference of 0.6 - 1.1 MPa is formed between the inner and outer sides of the wheel hub, significantly increasing the fog leakage speed at the leak point.

[0045] When there is a leak point in the wheel hub, the high-pressure fog on the inner side quickly sprays into the vacuum space of the outer sealing cover 81 through the leak hole under the action of the pressure difference, forming a high-speed fog flow. The semiconductor laser of the detecting component 82 cooperates with the fan-shaped beam expander to generate strong Mie scattering at the leak hole. The high-sensitivity industrial camera captures clear scattering spots, avoiding the spot blurring caused by the refraction of the water film; the humidity sensor in the sealing cover 81 monitors in real time. When the fog enters the sealed space, the humidity value (the initial humidity ≤ 50%RH) quickly rises ≥ 20%RH within 10 seconds, combined with the laser detection signal to form a dual criterion, reducing the false detection rate;

[0046] The residual heat from the hub surface heating (temperature ≥ 50°C) is used to maintain the temperature of the space inside the sealing cover 81 (maintain the temperature at 45-55°C) to ensure that the mist exists in gaseous form, avoid secondary condensation caused by a sudden drop in temperature, and ensure the detection accuracy of the humidity sensor. After the detection is completed, the cylinder drives the sealing cover 81 to separate, and the servo motor drives the detection mechanism 8 to reset; open the No. 2 control valve 95 to release the vacuum, and discharge the residual gas inside through the No. 2 connecting pipe 94 to complete the full process detection.

[0047] By establishing a pressure differential space between the inside and outside of the wheel hub through connecting pipe No. 2 94 and connecting pipe No. 3 96, the mist jet velocity at the leak point is increased, and the intensity of the scattered light spot is enhanced, thus resolving the problem in traditional normal pressure detection where weak leak point signals are easily drowned out by noise. The humidity sensor integrated in the sealing cover 81 can capture humidity mutations caused by leaks in real time, forming a "dual threshold" detection logic with the laser scattering signal (a leak point is determined when the laser spot area is ≥0.5mm² and the humidity rise rate is ≥2%RH / s), significantly improving detection reliability.

[0048] The sealing cover 81 is designed to fit the curved surface of the inner sealing strip to form a fully enclosed optical inspection darkroom, which improves the signal-to-noise ratio of the scattered light spot captured by the industrial camera 823, thereby improving the leak location accuracy. The heating mechanism 6 uses the preheating temperature of the wheel hub (50-60°C) to maintain the space temperature inside the sealing cover 81 ≥45°C through heat conduction, which is higher than the fog dew point temperature, avoiding fog condensation caused by ambient temperature fluctuations during the inspection process, ensuring the stability of the humidity sensor detection signal, and preventing the sealing strip from hardening at low temperatures and causing sealing failure.

[0049] The horizontal moving component 72 and the vertical moving component 73 adopt a high-precision drive combination of servo motor + cylinder, with a positioning error of ≤0.2mm. Combined with the closed-loop control of the pressure sensor and the No. 2 control valve 95, the vacuum degree and pressurization parameters can be automatically adjusted according to the wheel hub specifications, realizing intelligent adaptation of the detection process.

[0050] The method of use and working principle of this device are as follows: the wheel hub is sleeved on the surface of the heating mechanism 6, and the inner gear ring 52 is driven by the oil cylinder 53 to rotate along the No. 1 mounting frame 51. At this time, the gear 54 will drive the rack 55 to slide along the No. 1 mounting frame 51. Driven by the rack 55, the connecting plate 56 drives the heating mechanism 6 to expand outward. At this time, multiple heating mechanisms 6 are synchronously expanded outward to form a ring to tension the inner side of the wheel hub. At the same time, the wheel hub is heated by the electric heating component 62. The heating mechanism 6 tensions the inner side of the wheel hub to play a clamping role. At the same time, it is ensured that the heating surface on one side of the electric heating component 62 is in contact with the inner wall of the wheel hub, which can heat the wheel hub quickly and evenly. It can also be ensured that the center of the wheel hub and the center of the airtight frame 3 are on the same axis, so that the airtight frame 3 can accurately seal both sides of the wheel hub.

[0051] After the heating mechanism 6 clamps and fixes the hub in a tensioned state, the pushing mechanism 2 is used to push the airtight frames 3 closer to each other, and the airtight frames 3 seal both sides of the hub. When the heating mechanism 6 finishes heating the hub and the space between the airtight frames 3 and the hub, the expanding mechanism 5 retracts and brings the multiple heating mechanisms 6 closer together, causing the side of the electric heating component 62 to disengage from the hub, preventing the electric heating component 62 from adhering to the hub surface and interfering with the detection. The heat of the hub itself and the heat between it and the airtight frames 3 causes the rubber at the sealing joint between the airtight frames 3 and the hub surface to expand, thereby improving the sealing performance;

[0052] The ultrasonic nebulizer 4 is used to inject water mist into the inner side of the hub. At the same time, the pressurizing mechanism 9 pressurizes the inner side of the hub. During the pressurization process, the detection component 82 detects the outer side of the hub. By combining a semiconductor laser and an industrial camera, the laser line light source uses a fan-shaped beam expander. When there is a leak in the hub, the leaked fog, water mist, or aerosol water droplets generate Mie scattering in the laser beam when passing through the leak hole. The scattered light spots are captured by a high-sensitivity camera to locate the leak point, and the leak point coordinates are marked through image processing algorithms such as threshold segmentation + connected component analysis;

[0053] When performing airtightness detection on the hub, the horizontal position of the detection mechanism 8 can also be moved by the horizontal movement component 72, so that the hub is located between the two sealing covers 81. Subsequently, the vertical movement component 73 is used to push the two sealing covers 81 together to seal the outer side of the hub. Similarly, due to the heat of the hub surface, the sealing performance between the sealing cover 81 and the airtight frame 3 is improved. At this time, by closing the second control valve 95 and opening the air compressor 91, the air between the sealing cover 81 and the hub is discharged through the first connecting pipe 92 to form a vacuum state, and then the airtight frame 3 and the hub are pressurized through the third connecting pipe 96. At this time, a larger pressure difference space is formed on both sides of the hub. If there is a leak in the hub, the fog will quickly shoot out from the leak point, facilitating the detection component 82 to detect the leak point;

[0054] At the same time, through the enclosure of the sealing cover 81, the humidity sensor in the detection component 82 can monitor the humidity in the enclosed space. When there is a leak in the hub, the fog will enter the enclosed space, causing the humidity to increase. The hub heats the fog to prevent it from condensing, which is beneficial for the temperature sensor to monitor the humidity in the enclosed space, thereby assisting in determining whether there is a leak in the hub. At the same time, the enclosed space formed by the sealing cover 81 avoids the influence of external light on the industrial camera's capture of scattered light spots, which is beneficial for improving the accuracy of the detection result and the precision of determining the leak point location.

[0055] 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 perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A hub airtightness detection and processing device, comprising a fixed frame (1), two pushing mechanisms (2) are installed on the upper part of the fixed frame (1), and airtight frames (3) are fixedly connected to the ends of the two pushing mechanisms (2), and it is characterized in that: An ultrasonic atomizer (4) is surface-mounted on the surface of an airtight frame (3), and a telescopic mechanism (10) is fixedly connected to the inner side of another airtight frame (3). An expansion mechanism (5) is fixedly connected to the end of the telescopic mechanism (10). A plurality of heating mechanisms (6) are surface-mounted on the surface of the expansion mechanism (5), and the expansion mechanism (5) is used to expand or contract between the plurality of heating mechanisms (6). Each of the plurality of heating mechanisms (6) includes a base (61), and an electric heating component (62) is fixedly connected to the upper part of the base (61). The electric heating component (62) is used to heat the space between the two airtight frames (3) and the wheel hub. The expansion mechanism (5) drives the plurality of heating mechanisms (6) to synchronously expand outward in a circular shape to tension the inner side of the wheel hub, and at the same time, the wheel hub is heated by the electric heating component (62). The heating mechanism (6) tensions the inner side of the wheel hub to play a clamping role; An adjustment mechanism (7) is fixedly connected to the side of the fixed frame (1), and a detection mechanism (8) is fixedly connected to the surface of the adjustment mechanism (7). The detection mechanism (8) includes two semi-circular sealing covers (81), and a detection component (82) is installed inside the sealing cover (81). The adjustment mechanism (7) is used to adjust the position of the detection mechanism (8); A pressurization mechanism (9) is installed between the airtight frame (3) and the detection mechanism (8). The pressurization mechanism (9) is used to evacuate the space between the detection mechanism (8) and the outer surface of the wheel hub, and the pressurization mechanism (9) is used to pressurize the space between the airtight frame (3) and the inner surface of the wheel hub.

2. The hub airtightness detection and processing equipment according to claim 1, characterized in that: The pressurization mechanism (9) includes an air compressor (91). The intake end of the air compressor (91) is fixedly connected to a first connecting pipe (92). The first connecting pipe (92) is fixedly connected to the sealing cover (81), and a first control valve (93) is installed on the surface of the first connecting pipe (92). A second connecting pipe (94) is fixedly connected to the surface of the first connecting pipe (92), and a second control valve (95) is installed on the surface of the second connecting pipe (94). The outlet end of the air compressor (91) is fixedly connected to a third connecting pipe (96). The third connecting pipe (96) is fixedly connected to the airtight frame (3), and a third control valve (97) is fixedly connected to the surface of the third connecting pipe (96).

3. The airtightness detection and processing equipment for a wheel hub according to claim 1, characterized in that: The telescopic mechanism (10) includes a telescopic rod (101) and a spring (102). The telescopic rod (101) is fixedly connected to the airtight frame (3), and the telescopic rod (101) is fixedly connected to the expansion mechanism (5). The spring (102) is fixedly connected to the airtight frame (3), and the spring (102) is fixedly connected to the expansion mechanism (5).

4. A hub airtightness detection and processing device according to claim 1, characterized in that: The expansion mechanism (5) includes a first mounting frame (51), a gear (54) and a rack (55). An internal gear ring (52) is slidably connected to the inner side of the first mounting frame (51), and an oil cylinder (53) is installed on the outer side of the first mounting frame (51). One end of the oil cylinder (53) is movably connected to the internal gear ring (52). The gear (54) is rotatably connected to the first mounting frame (51), the rack (55) is slidably connected to the first mounting frame (51), and the rack (55) meshes with the gear (54). A connecting plate (56) is fixedly connected to the side surface of the rack (55), and the connecting plate (56) is fixedly connected to the base (61).

5. A hub airtightness detection and processing device according to claim 1, characterized in that: The adjustment mechanism (7) includes a connecting frame (71). A horizontal movement component (72) is fixedly connected to the surface of the connecting frame (71). A vertical movement component (73) is installed on the moving end of the horizontal movement component (72). The moving end of the vertical movement component (73) is fixedly connected to the sealing cover (81).

6. The airtightness detection and processing equipment for a wheel hub according to claim 1, characterized in that: Sealing strips are fixedly connected to the inner side and the end of the sealing cover (81). The sealing strip on the inner side of the sealing cover (81) is used to seal the sealing cover (81) and the outer surface of the wheel hub, and the sealing adjustment at the end of the sealing cover (81) is used for mutual sealing between the two sealing covers (81).

7. An airtightness detection and processing device for a wheel hub according to claim 6, characterized in that: A plurality of detection components (82) are annularly arranged inside the sealing cover (81). The detection component (82) is composed of a semiconductor laser, an industrial camera and a humidity sensor.

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