Hub air tightness detection processing equipment

Abstract

The invention discloses hub airtightness detection processing equipment, and relates to the technical field of airtightness detection, the hub airtightness detection processing equipment comprises a fixing frame, two pushing mechanisms are installed on the upper portion of the fixing 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, 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. The hub and the sealed space are heated through the heating mechanism, so that the temperature is higher than the dew point, water vapor condensation is avoided fundamentally, interference of a water film on visual detection and laser detection is eliminated, the leakage point recognition accuracy is improved, gear and rack transmission of the expansion mechanism ensures that the multiple heating units synchronously tension the hub, and coaxial positioning of the circle center is achieved; and the elastic sealing ring of the airtight frame is matched to improve the sealing performance and ensure the stability of the internal pressure in the detection process.

Description

Technical Field

[0001] The present invention relates to the technical field of airtightness detection, and specifically 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 lead to poor sealing and air leakage between the wheel hub and the tire, and further cause 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 an airtightness detection and processing device to detect its airtightness.

[0003] For example, the patent with the publication number CN116202697B discloses an airtightness detection device for processing aluminum alloy wheel hubs, which includes a detection vertical platform, an airtightness frame, a support frame, a bottom plate, an airtightness fog anti-leakage 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 anti-leakage detection mechanism includes a sealing test mechanism and a fog intervention 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 many 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 leakage holes, making it difficult for traditional visual inspection to distinguish normal condensed water from leakage point seepage. 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 leakage hole, causing fine leakage 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 inside 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, an electric heating component is fixedly connected to the upper part of the base, and the electric heating component is used to heat the space between the two airtight frames and the hub; An adjustment mechanism is fixedly connected to the side of the fixed frame, and a detection mechanism is fixedly connected to the surface of the adjustment mechanism. The detection mechanism includes two semi-circular sealing covers, and a detection component is installed inside the sealing cover. The adjustment mechanism is used to adjust the position of the detection mechanism; 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.

[0007] 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. A second connecting pipe is fixedly connected to the surface of the first connecting pipe, and 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.

[0008] 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.

[0009] Preferably, the telescopic mechanism includes a telescopic rod and a spring. The telescopic rod is fixedly connected to the airtight frame and is also fixedly connected to the expansion mechanism. The spring is fixedly connected to the airtight frame and is also fixedly connected to the expansion mechanism.

[0010] 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.

[0011] Preferably, the adjustment mechanism includes a connecting frame. A horizontal movement component is fixedly connected to the surface of the connecting frame. A vertical movement component is installed on the moving end of the horizontal movement component. The moving end of the vertical movement component is fixedly connected to the sealing cover.

[0012] 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.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 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 that small leak holes are easily missed 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; 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 increasing 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; 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 injection 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; 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 leak point positioning accuracy. The preheating temperature of the hub by the heating mechanism maintains the temperature in the space inside the sealing cover 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 at the same time preventing the sealing failure caused by the low-temperature hardening of the sealing rubber strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is the first three-dimensional structural schematic diagram of a hub airtightness detection and processing device of the present invention; Figure 2 is the second three-dimensional structural schematic diagram of a hub airtightness detection and processing device of the present invention; Figure 3 is the side view structural schematic diagram of a hub airtightness detection and processing device of the present invention; Figure 4 is the three-dimensional structural schematic diagram of the airtightness frame in a hub airtightness detection and processing device of the present invention; Figure 5 is the three-dimensional structural schematic diagram of the telescopic mechanism in a hub airtightness detection and processing device of the present invention; Figure 6 is the unfolded three-dimensional structural schematic diagram of the expansion mechanism in a hub airtightness detection and processing device of the present invention; Figure 7 is the three-dimensional structural schematic diagram of the pressurizing mechanism in a hub airtightness detection and processing device of the present invention; Figure 8 is the three-dimensional structural schematic diagram of the adjustment mechanism in a hub airtightness detection and processing device of the present invention; Figure 9 is the three-dimensional structural schematic diagram of the detection mechanism in a hub airtightness detection and processing device of the present invention.

[0015] In the figure: 1, fixed frame; 2, pushing mechanism; 3, airtightness 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, adjustment 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. DETAILED DESCRIPTION OF THE INVENTION

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0017] Embodiment 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. An airtight frame 3 is fixedly connected to the end of each of the two pushing mechanisms 2. 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. An expansion mechanism 5 is fixedly connected to the end of the telescopic mechanism 10. 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. 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. 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 is also fixedly connected to the expansion mechanism 5. The spring 102 is fixedly connected to the airtight frame 3 and is also 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. 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 meshes with the gear 54. A connecting plate 56 is fixedly connected to the side of the rack 55. The connecting plate 56 is fixedly connected to the base 61.

[0018] 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 outward. At this time, multiple heating mechanisms 6 expand outward synchronously to form a ring to tension the inner side of the hub. At the same time, the hub is heated by the electric heating component 62. Tensioning 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 electric heating component 62 is in contact with the inner wall of the hub, which can quickly and evenly heat the hub, and can also ensure that the center of the hub is on the same axis as the center of the airtight frame 3, so that the airtight frame 3 can accurately seal both sides of the hub; After the heating mechanism 6 finishes tensioning and clamping 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 finishes heating the hub and the space between the airtight frame 3 and the hub, the expanding mechanism 5 retracts and closes multiple heating mechanisms 6, so that the side of the electric heating component 62 is separated from the hub, avoiding the electric heating component 62 being in contact with the surface of the hub and interfering with the detection. The heat of the hub itself and the heat between it and the airtight frame 3 will cause the rubber at the sealing joint where the airtight frame 3 is in contact with the hub surface to expand, thereby improving the sealing performance; 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 is used to pressurize the inner side of the hub. During the pressurizing process, the detection component 82 detects the outer side of the hub. The semiconductor laser and the industrial camera are combined. The laser line light source uses a fan-shaped beam expander. When there is a leak point 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; The pushing mechanism 2 can be composed of a hydraulic cylinder driving a sliding bracket, or 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. The driving motor drives the lead screw to rotate, and the slider slides along the linear guide rail to realize the approaching or separating action of the airtight frame 3.

[0019] The heating mechanism 6 is composed of multiple heating units evenly distributed in the circumferential direction. 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 outside the electric heating component 62. When the expanding mechanism 5 acts, the connecting plate 56 drives the electric heating component 62 to expand outward to form a ring, and the inner side of the heating plate is in contact with the inner wall of the hub, realizing tensioning and clamping and rapid and uniform heating, and at the same time ensuring that the center of the hub is coaxial with the center of the airtight frame 3, which is convenient for the airtight frame 3 to accurately seal.

[0020] The hub and the sealed space are heated by the heating mechanism 6 to make the temperature higher than the dew point, avoiding water vapor condensation at the source, eliminating the interference of the water film on visual inspection and laser inspection, improving the accuracy of leak point identification. The gears 54 and the rack 55 of the expansion mechanism 5 drive to ensure that multiple heating units synchronously tension the hub, realizing concentric positioning of the center of the circle. Cooperating with the elastic sealing ring of the airtight frame 3, the sealing performance is improved, and the internal pressure is ensured to be stable 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 and shorten the detection cycle.

[0021] The fan-shaped laser surface of the detection component 82 covers the outside of the 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 that small leak holes are easily missed in traditional detection. Each mechanism is linked through the control system to realize the automation of hub positioning, heating, sealing, pressurization and detection, reduce manual intervention, improve the detection efficiency and stability, and meet the requirements of large-scale industrial production.

[0022] Embodiment 2: According to Figures 1-9 As shown in the figure, the pressurization 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; A regulating mechanism 7 is fixedly connected to the side of the fixing frame 1. A detection mechanism 8 is fixedly connected to the surface of the regulating mechanism 7. The detection mechanism 8 includes two semi-circular sealing covers 81. A detection component 82 is installed inside the sealing cover 81. The regulating mechanism 7 is used to adjust the position of the detection 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 on the moving end of the horizontal moving component 72. The moving end of the vertical moving component 73 is fixedly connected with the sealing cover 81. 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. 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 hub. The sealing adjustment at the end of the sealing cover 81 is used to seal between the two sealing covers 81.

[0023] In this embodiment, the servo motor of the horizontal movement component 72 drives the transmission lead screw, causing the sliding base to drive the sealing cover 81 to move horizontally, and accurately positioning the hub between the two sealing covers 81; subsequently, the cylinder of the vertical movement component 73 pushes the sealing cover 81 to close vertically, and the inner sealing rubber strip closely fits the outer curved surface of the hub, forming an independent and airtight detection space. Close the second control valve 95, start the air compressor 91 to extract the air between the sealing cover 81 and the 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 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 hub, significantly increasing the fog leakage speed at the leak point.

[0024] When there is a leak point in the 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 detection component 82 cooperates with the fan-shaped beam expander to generate strong Mie scattering at the leak hole, and the high-sensitivity industrial camera captures a clear scattering light spot, avoiding the light 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 airtight space, the humidity value (the initial humidity ≤ 50%RH) quickly rises by ≥ 20%RH within 10 seconds, combined with the laser detection signal to form a dual criterion, reducing the false detection rate. Utilize the waste heat after heating the hub surface (temperature ≥ 50°C) to maintain the temperature of the space in the sealing cover 81 (the maintained temperature is 45 - 55°C), ensuring that the fog exists in a gaseous state, avoiding secondary condensation caused by a sudden drop in temperature, and ensuring 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 second control valve 95 to release the vacuum, and discharge the residual gas inside through the second connecting pipe 94 to complete the full-process detection.

[0025] Construct a pressure difference space inside and outside the hub through the second connecting pipe 94 and the third connecting pipe 96, so that the fog injection speed at the leak point is increased and the intensity of the scattering light spot is enhanced, solving the problem that the weak leak point signal in traditional atmospheric pressure detection is easily submerged by noise. The humidity sensor integrated in the sealing cover 81 can capture the humidity mutation caused by the leakage of the leak hole in real time, forming a "dual-threshold" detection logic with the laser scattering signal (when the laser light spot area ≥ 0.5 mm² and the humidity rise rate ≥ 2%RH / s, it is determined as a leak point), significantly improving the detection reliability. The sealing cover 81 is designed with a curved surface fitting design 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 leakage point positioning accuracy. The heating mechanism 6 uses the preheating temperature (50-60°C) of the wheel hub to maintain the space temperature inside the sealing cover 81 ≥45°C through heat conduction, which is higher than the fog dew point temperature, to avoid fog condensation caused by ambient temperature fluctuations during the inspection process, ensure the stability of the humidity sensor detection signal, and prevent the sealing strip from hardening at low temperature and causing sealing failure. The horizontal moving component 72 and the vertical moving component 73 adopt a high-precision drive combination of a 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 to achieve intelligent adaptation of the detection process.

[0026] The method of using and working principle of the 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, and the connecting plate 56 drives the heating mechanism 6 to expand outward under the drive of the rack 55. At this time, multiple heating mechanisms 6 are synchronously expanded outward to form a ring to tighten 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 tightens the inner side of the wheel hub to play a clamping role, and 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, so that the wheel hub can be quickly and evenly heated, and 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; After the heating mechanism 6 has completed tensioning, clamping and fixing the wheel hub, the pushing mechanism 2 pushes the airtight frame 3 to move closer to each other, and the airtight frame 3 seals both sides of the wheel hub. When the heating mechanism 6 has completed heating the wheel hub and the space between the airtight frame 3 and the wheel hub, the expansion mechanism 5 brings the multiple heating mechanisms 6 together to separate the side of the electric heating component 62 from the wheel hub, so as to avoid the electric heating component 62 from fitting with the wheel hub surface and interfering with the detection. The heat between the wheel hub itself and the airtight frame 3 will cause the rubber at the sealing place where the airtight frame 3 fits with the wheel hub surface to expand, thereby improving the sealing performance. Water mist is injected into the inner side of the wheel hub by the ultrasonic atomizer 4, and at the same time, the inner side of the wheel hub is pressurized by the pressurizing mechanism 9. During the pressurization process, the outer side of the wheel hub is detected by the detection component 82. The laser line light source adopts a fan-shaped beam expander by combining a semiconductor laser and an industrial camera. When there is a leak in the wheel 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, and the leak coordinates are marked by image processing algorithms such as threshold segmentation + connected domain analysis; When performing airtightness detection on the wheel hub, the horizontal position of the detection mechanism 8 can also be moved through the horizontal movement component 72, so that the wheel hub is located between the two sealing covers 81. Subsequently, the two sealing covers 81 are pushed together by the vertical movement component 73 to seal the outside of the wheel hub. Similarly, through the heat on the surface of the wheel hub, 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 wheel hub is discharged through the first connecting pipe 92 to form a vacuum state, and then the airtight frame 3 and the wheel hub are pressurized through the third connecting pipe 96. At this time, a larger pressure difference space is formed on both sides of the wheel hub. If there is a leak in the wheel hub, the mist will quickly shoot out from the leak point, facilitating the detection component 82 to detect the leak point; 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 wheel hub, the mist will enter the enclosed space, resulting in an increase in humidity. The wheel hub is used to heat the mist to prevent its condensation, which is beneficial for the temperature sensor to monitor the humidity in the enclosed space, thereby assisting in judging whether there is a leak in the wheel hub. At the same time, the enclosed space formed by the sealing cover 81 avoids the influence of external light on the capture of scattered light spots by the industrial camera, which is beneficial for improving the accuracy of the detection result and the precision of judging the leak point position.

[0027] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they 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 in 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), characterized in that: An ultrasonic atomizer (4) is surface-mounted on the surface of an airtight rack (3), and a telescopic mechanism (10) is fixedly connected to the inner side of another airtight rack (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 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 racks (3) and the hub. An adjusting mechanism (7) is fixedly connected to the side of the fixing frame (1), and a detecting mechanism (8) is fixedly connected to the surface of the adjusting mechanism (7). The detecting mechanism (8) includes two semi-circular sealing covers (81), and a detecting component (82) is installed inside the sealing cover (81). The adjusting mechanism (7) is used to adjust the position of the detecting mechanism (8). A pressurizing mechanism (9) is installed between the airtight rack (3) and the detecting mechanism (8). The pressurizing mechanism (9) is used to evacuate the space between the detecting mechanism (8) and the outer surface of the hub, and the pressurizing mechanism (9) is used to pressurize the space between the airtight rack (3) and the inner surface of the hub.

2. The airtightness detection and processing equipment for a hub according to claim 1, characterized in that: The pressurizing mechanism (9) includes an air compressor (91). A first connecting pipe (92) is fixedly connected to the intake end of the air compressor (91). 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). A third connecting pipe (96) is fixedly connected to the outlet end of the air compressor (91). The third connecting pipe (96) is fixedly connected to the airtight rack (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 hub according to claim 1, wherein: The telescopic mechanism (10) includes a telescopic rod (101) and a spring (102). The telescopic rod (101) is fixedly connected to the airtight rack (3), and the telescopic rod (101) is fixedly connected to the expansion mechanism (5). The spring (102) is fixedly connected to the airtight rack (3), and the spring (102) is fixedly connected to the expansion mechanism (5).

4. The airtightness detection and processing equipment for a hub according to claim 1, wherein: 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) is engaged with the gear (54). A connecting plate (56) is fixedly connected to the side of the rack (55), and the connecting plate (56) is fixedly connected to the base (61).

5. The airtightness detection and processing equipment for a wheel hub according to claim 1, wherein: 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 both 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).

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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