A hub bearing seal detection device and method

Abstract

The application provides a kind of hub bearing leak detection device and method, belong to bearing detection technical field, including experiment box, the placing cavity and detection cavity are formed by partition in experiment box, detection tank is set in the bottom of detection cavity and is filled with rust-proof coolant, cooling mechanism is installed in detection tank, thermal imaging module for obtaining original thermal imaging view is arranged on the side of detection tank;Detection assembly is used to simulate the working condition of hub bearing while injecting high-temperature liquid lubricating oil into hub bearing, transfer assembly transports hub bearing to the replacement position in placing cavity or the detection position in detection cavity, locking assembly is used to connect the hub bearing of detection position with detection assembly;Control module is used to control the operation of the detection device;Leaked high-temperature lubricating oil forms significant temperature difference in low-temperature rust-proof coolant, cooperates with thermal imaging module to capture heat source reaction, which helps to determine the leakage position, solves the problem of inaccurate positioning of leakage position in traditional leak detection device.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bearing detection, and more particularly relates to a hub bearing sealing property detection device and method. BACKGROUND

[0002] In the field of automobile industry, as a component for supporting wheels and bearing the load of vehicles, if the hub bearing is poorly sealed, impurities such as dust and water from the outside world are easy to invade the inside of the bearing, resulting in the loss of lubricating grease and the aggravation of bearing wear, and further causing abnormal noise and vibration, therefore, it is necessary to detect the sealing property of the hub bearing to ensure product quality.

[0003] The method for detecting the sealing property of the hub bearing in the prior art mainly includes manual visual inspection, water immersion method and air pressure detection method, wherein the manual visual inspection depends on the experience of the operator, and the sealing property is judged by observing whether there are cracks, deformation and other defects on the surface of the bearing sealing element, this method is not only inefficient, but also difficult to find small gaps or internal sealing defects, the water immersion method is to immerse the hub bearing in water and apply air pressure, and the leakage point is judged by observing the generation of air bubbles, but the bearing needs to be dried after detection, and the air pressure detection method usually judges the sealing property by measuring the change of the air pressure in the bearing, but cannot locate the specific leakage position, therefore, there is an urgent need for a sealing property detection device for the hub bearing with high positioning accuracy to solve the above problems. SUMMARY

[0004] In order to solve the above technical problems, the application provides a hub bearing sealing property detection device and method to solve the technical problem that the conventional sealing property detection device is not accurate in locating the leakage position in the prior art.

[0005] The purpose and effect of the hub bearing sealing property detection device and method are achieved by the following specific technical means.

[0006] A hub bearing sealing property detection device comprises:

[0007] An experiment box is formed by setting a partition plate in the experiment box to form a placing cavity and a detection cavity, and the placing cavity and the detection cavity are communicated through a through groove formed on the partition plate;

[0008] A detection box is arranged at the bottom of the detection cavity and contains rust-proof cooling liquid inside, a cooling mechanism is installed in the detection box, the cooling mechanism cools the rust-proof cooling liquid contained in the detection box, a temperature sensor for obtaining reference temperature data of the cooling liquid is arranged in the detection box, and a thermal imaging module for obtaining an original thermal imaging view is arranged on one side of the detection box;

[0009] The detection assembly is used for simulating the working condition of the hub bearing, and simultaneously injecting liquid lubricating oil into the hub bearing and obtaining the injection pressure change rate through the pressure sensor;

[0010] The transfer assembly is installed at the bottom of the detection box and penetrates through the groove and is located in the placement cavity, and is used for transferring the hub bearing to be detected to the replacement position in the placement cavity or the detection position in the detection cavity, and when the hub bearing is located at the detection position, the rotation axis thereof coincides with the rotation axis of the detection assembly, and the thermal imaging module is located at one end of the rotation axis of the detection assembly;

[0011] The locking assembly is used for locking and connecting the hub bearing at the detection position and the detection assembly;

[0012] The control module is installed on the openable door plate on one side of the experimental box, and is used for controlling the operation of the detection device.

[0013] According to a preferred embodiment, the detection assembly comprises a rotating shaft and a rotating motor for simulating the working condition of the hub bearing, a first mounting base is arranged in the detection box, two groups of first sliding rails are arranged at the top of the first mounting base, two groups of first waterproof electric sliding blocks are arranged on the two groups of first sliding rails respectively, the top of the two groups of first waterproof electric sliding blocks is connected with a first moving frame, a waterproof box is arranged on one side of the first moving frame, a rotating motor is arranged in the waterproof box, and the rotating motor is used for driving the rotating shaft to rotate around the axis thereof;

[0014] A through hole is formed in one side of the waterproof box, a rotating shaft is arranged in the through hole, the rotating shaft is connected with the main shaft of the rotating motor through two groups of meshing gears, a connecting shaft section for connecting with the hub bearing is arranged on the rotating shaft, and a sealing bearing is arranged in the through hole and corresponds to the rotating shaft.

[0015] According to a preferred embodiment, the detection assembly further comprises an oil injection channel for injecting liquid lubricating oil into the hub bearing, the rotating shaft and the connecting shaft section are provided with the oil injection channel corresponding to the hub bearing, the position of the sealing structure on the hub bearing corresponds to the oil outlet end of the oil injection channel, a heating box is arranged in the waterproof box, a heating pipe and a heat pipe type heater are arranged in the heating box, the heat pipe type heater surrounds the heating pipe and heats the lubricating oil conveyed by the heating pipe, a pressure sensor is arranged at the bottom of the heating pipe, one end of the heating pipe is connected with the oil inlet end of the oil injection channel through a rotating joint, and an oil storage tank is arranged in the waterproof box, an oil pump is arranged at the top of the oil storage tank, and the oil pump is connected with the other end of the heating pipe and the oil storage tank through a pipeline.

[0016] According to a preferred embodiment, the locking assembly comprises a locking sleeve for locking the hub bearing on the connecting shaft section, a second mounting base is arranged in the detection box, a lifting column is arranged above the second mounting base, a waterproof locking motor is arranged on one side of the lifting column, the waterproof locking motor is used to install the locking sleeve on one side of the connecting shaft section, a rotating plate is connected to the shaft end of the waterproof locking motor, a grabbing structure and a waterproof electric telescopic rod are arranged on one side of the rotating plate, and the waterproof electric telescopic rod is used to drive the grabbing structure to grab the locking sleeve;

[0017] A third waterproof electric sliding block is arranged on each of the two groups of third sliding rails, and the top of each of the two groups of third waterproof electric sliding blocks is connected with the lifting table. The lifting table is provided with a lifting sliding groove in the top, and the lifting column is slidably arranged in the lifting sliding groove. The lifting column is used to move the grabbing structure and the waterproof locking motor to a detection position or an avoiding position in the detection cavity. When the grabbing structure and the waterproof locking motor are located at the detection position, the rotating axis of the grabbing structure and the waterproof locking motor coincides with the rotating axis of the hub bearing located at the detection position and the rotating axis of the detection assembly. A rack is arranged on one side of the lifting column, and a waterproof lifting motor is arranged on one side of the lifting table. A gear is arranged on the main shaft of the waterproof lifting motor and is engaged with the rack.

[0018] According to a preferred embodiment, the transfer assembly comprises a fixing plate for placing the hub bearing. The transfer support is mounted in the detection box, passes through the through groove and is located in the placement cavity. Two groups of second sliding rails are arranged on one side of the transfer support. Two groups of second waterproof electric sliding blocks are arranged on one side of each of the two groups of second sliding rails. Four groups of second waterproof electric sliding blocks are connected with the lifting frame on one side. The fixing plate is rotatably arranged on one side of the lifting frame. A plurality of fixing holes are arranged on one side of the fixing plate. The hub bearing is connected with the plurality of fixing holes through a plurality of fixing screws.

[0019] A positioning method of a hub bearing sealing detection device comprises the following steps:

[0020] The pressure sensor is used to obtain the injection pressure change rate. The injection pressure change rate is used to trigger a shutdown protocol and output a leakage trigger flag.

[0021] The leakage trigger flag is used to activate the thermal imaging module to obtain a plurality of original thermal imaging views. A pre-stored temperature-gray scale table is obtained. The temperature-gray scale table is used to convert the plurality of original thermal imaging views into a plurality of temperature field views. The temperature field views are represented by temperature points.

[0022] The temperature sensor is used to obtain the reference temperature data of the cooling liquid. The plurality of temperature field views and the reference temperature data of the cooling liquid are used to obtain a peak temperature rise view.

[0023] The peak temperature rise view is used to construct a thermal gradient vector field. The thermal gradient vector field and the peak temperature rise view are used to generate a divergence distribution map.

[0024] A plurality of temperature attenuation paths are obtained based on the divergence distribution map, and a plurality of temperature attenuation paths are subjected to leakage source confidence verification to obtain a leakage point coordinate, and a leakage position parameter of the hub bearing is obtained according to the projection view of the leakage point coordinate and the three-dimensional model of the hub bearing.

[0025] According to a preferred embodiment, the conversion of the plurality of original thermal imaging views into a plurality of temperature field views according to the temperature-gray scale table comprises:

[0026] Based on the plurality of original thermal imaging views, pixel points in each original thermal imaging view are extracted, a pre-calibrated temperature-gray scale table is loaded to perform table lookup conversion on each pixel, each pixel point is converted into a temperature point according to the temperature-gray scale table, and a plurality of temperature field views are obtained.

[0027] According to a preferred embodiment, the peak temperature rise view is obtained based on the plurality of temperature field views and the reference temperature data of the cooling liquid, and the peak temperature rise view comprises:

[0028] The real-time temperature data of each temperature point in each temperature field view is extracted, and a plurality of temperature difference data are obtained by subtracting the reference temperature data of the cooling liquid from the plurality of real-time temperature data;

[0029] Each temperature point in each temperature field view is converted into a temperature difference point according to the corresponding temperature difference data, and a plurality of relative temperature rise field views are generated;

[0030] The plurality of temperature rise field views and the plurality of original thermal imaging views are overlapped, the highest temperature difference data of the corresponding plurality of temperature difference points at each pixel position are recorded, the highest temperature difference points are obtained, and the plurality of highest temperature difference points are constructed into a peak temperature rise view.

[0031] According to a preferred embodiment, the thermal gradient vector field is constructed based on the peak temperature rise view, and the divergence distribution map is generated based on the thermal gradient vector field and the peak temperature rise view, and the divergence distribution map comprises:

[0032] Each highest temperature difference point in the peak temperature rise view is extracted, the horizontal temperature change rate is obtained according to the horizontal temperature difference between each highest temperature difference point and an adjacent highest temperature difference point, and the vertical temperature change rate is obtained according to the vertical temperature difference between each highest temperature difference point and an adjacent highest temperature difference point;

[0033] Each highest temperature difference point is generated into a vector arrow according to the corresponding horizontal temperature change rate and vertical temperature change rate, the direction of the vector arrow points to the direction of the fastest temperature rise, a plurality of vector arrows are combined into a vector arrow map, and the vector arrow map is a thermal gradient vector field;

[0034] The thermal gradient vector field and the peak temperature rise view are overlaid, the divergence value of each highest temperature difference point is obtained, and the divergence distribution map is generated according to the peak temperature rise view and the divergence value of each highest temperature difference point;

[0035] The divergence value is the pointing relationship of the vector arrow;

[0036] The higher the divergence value, the fewer the vector arrow points to;

[0037] The lower the divergence value, the more the vector arrow points to.

[0038] According to a preferred embodiment, the method further comprises:

[0039] In the divergence distribution map, all the highest temperature difference points with a divergence value lower than a threshold value are screened, and these highest temperature difference points are constructed into a candidate point set, and from each candidate point, upward tracking is performed according to the temperature difference of adjacent highest temperature difference points being lower than a tracking threshold value until the temperature drops to 10% of the highest temperature or the surface of the cooling liquid is reached, to generate a plurality of temperature decay paths;

[0040] Leakage source confidence verification is performed on the plurality of temperature decay paths, a plurality of highest temperature difference points are randomly selected on the temperature decay paths, the average deviation angle of the plurality of highest temperature difference points corresponding to the temperature decay paths is calculated, vertical characteristic verification is performed, the candidate point is selected as a leakage point coordinate if it passes the verification, and the candidate point is judged as an interference signal if it fails the verification.

[0041] Compared with the prior art, the present application has the following beneficial effects:

[0042] 1. By rotating the shaft and the rotating motor to simulate the actual rotation condition of the hub bearing, and by injecting heated liquid lubricating oil into the bearing through the oil injection channel, the leaked lubricating oil forms a significant temperature difference in the low-temperature rust-proof cooling liquid environment, the heat source reaction generated by the leakage is directly captured by the thermal imaging module on one side of the detection box to obtain an original thermal imaging view, the original thermal imaging view is converted into a temperature field view, the peak temperature rise view is extracted in combination with the reference temperature of the cooling liquid, the highest temperature difference area is focused, and irrelevant temperature fluctuations in the low-temperature rust-proof cooling liquid environment are filtered out, so that the analysis range is concentrated in the possible leakage area, and the interference of non-leakage factors on positioning is reduced; by constructing a thermal gradient vector field and generating a divergence distribution map, the core area with the fastest temperature rise is determined through temperature change rate and vector pointing analysis, the temperature diffusion interference caused by the flow of the cooling liquid is excluded, the specific position of the leakage source is locked from the temperature change law, and the accuracy of positioning is improved; finally, the leakage point coordinates are combined with the projection view of the three-dimensional model of the hub bearing, and the specific parameters of the leakage position relative to the bearing structure are directly output, so that the detection result can correspond to the sealing device, the joint and other parts of the bearing, clear position guidance is provided for subsequent analysis of the sealing failure reason and repair, which helps to determine the leakage position, and solves the problem of inaccurate positioning of the leakage position in the traditional sealing detection device.

[0043] 2. Through the setting of the transfer assembly, the personnel can install the hub bearing to be detected on the fixed plate at the replacement position in use, then move the hub bearing to the detection position through the second waterproof electric sliding block on the second sliding rail, so that the axis of the hub bearing coincides with the axis of the rotating shaft in the detection assembly, and the stable transfer of the hub bearing from the replacement position to the detection position is realized. Since the detection position is in the detection box, and the detection box contains low-temperature rust-proof cooling liquid, through the setting of the transfer assembly, the personnel can avoid operating in the low-temperature rust-proof cooling liquid, and the convenience is improved.

[0044] 3. Through the setting of the locking assembly, when the hub bearing is at the detection position, the first waterproof electric sliding block moves on the first sliding rail, so that one end of the rotating shaft penetrates through the inner ring of the hub bearing, and the hub bearing is sleeved outside the connecting shaft section on the rotating shaft. The waterproof lifting motor is started to engage with the rack on the lifting column through the gear, drive the lifting column to move up and down along the lifting sliding groove on the top of the lifting platform, adjust the height of the waterproof locking motor, so that the axis of the locking shaft sleeve coincides with the axis of the rotating shaft. The third waterproof electric sliding block moves on the third sliding rail, and the waterproof locking motor is started. The main shaft drives the rotating plate, the sliding plate and the plurality of grabbing plates to rotate, the locking shaft sleeve is installed on one end of the rotating shaft, the hub bearing is axially locked on the connecting shaft section, the installation and fixation are completed, the detection data distortion caused by bearing displacement is reduced, the detection error caused by improper installation is reduced, and different specifications of hub bearings can be adapted through structural adjustment. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 is the structure schematic diagram of the assembled application;

[0046] Figure 2 is the structure schematic diagram of the application after unfolding;

[0047] Figure 3 is the structure schematic diagram of the assembled detection assembly in the application;

[0048] Figure 4 is the structure schematic diagram of the split detection assembly in the application;

[0049] Figure 5 is the structure schematic diagram of the assembled transfer assembly in the application;

[0050] Figure 6 is the structure schematic diagram of the split transfer assembly in the application; Figure 5

[0051] Figure 7 is the structure schematic diagram of the assembled locking assembly in the application;

[0052] Figure 8 is the structure schematic diagram of the split locking assembly in the application; Figure 7 ​​

[0053] Figure 9 is a step flow chart of a positioning method of a hub bearing sealing detection device of the present application;

[0054] Figure 10 is a step flow chart of a view of obtaining peak temperature rise in the positioning method of the hub bearing sealing detection device of the present application;

[0055] Figure 11 is a step flow chart of generating a divergence distribution graph in the positioning method of the hub bearing sealing detection device of the present application.

[0056] In the figure, the correspondence between the component names and the figure numbers is as follows:

[0057] 101, experimental box; 102, partition plate; 103, through groove; 104, detection box; 105, temperature sensor; 106, thermal imaging module; 107, hub bearing; 108, control module; 109, openable door plate; 201, pressure sensor; 202, rotating shaft; 203, rotating motor; 204, first mounting base; 205, first sliding rail; 206, first waterproof electric sliding block; 207, first moving frame; 208, waterproof box; 210, connecting shaft section; 211, sealing bearing; 212, oil injection channel; 213, heating box; 214, heating pipe; 215, heat pipe type heater; 217, oil storage tank; 218, oil pump; 301, locking shaft sleeve; 302, second mounting base; 303, lifting column; 304, waterproof locking motor; 305, rotating plate; 306, connecting rod; 307, slide plate; 308, first sliding groove; 309, grabbing plate; 310, sliding rod; 311, waterproof electric telescopic rod; 312, driving block; 313, second sliding groove; 314, first rotating seat; 315, second rotating seat; 316, connecting rod; 317, third sliding rail; 318, third waterproof electric sliding block; 319, lifting platform; 320, lifting sliding groove; 322, rack; 323, waterproof lifting motor; 324, slide cylinder; 401, fixed plate; 402, transfer support; 403, second sliding rail; 404, second waterproof electric sliding block; 405, lifting frame; 406, fixing hole. DETAILED DESCRIPTION

[0058] The embodiments of the present application will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the technical solutions of the present application, but cannot be used to limit the protection scope of the present application.

[0059] Example:

[0060] As shown in the accompanying Figures 1 to 8 :

[0061] The present application provides a hub bearing sealing detection device, comprising:

[0062] The experimental box 101 is internally provided with a placing cavity and a detection cavity by arranging a partition plate 102, the placing cavity is used for installing or taking off the hub bearing 107 to be detected by a detection personnel, the detection cavity is used for carrying out a sealing detection operation, the placing cavity and the detection cavity are communicated through a through groove 103 arranged on the partition plate 102, and the through groove 103 provides a channel for the transfer assembly to transport the hub bearing 107; the detection box 104 is arranged at the bottom of the detection cavity and internally contains rust-proof cooling liquid, the detection box 104 is internally provided with a cooling mechanism, the cooling mechanism keeps the rust-proof cooling liquid in the detection box 104 at a stable temperature by continuously refrigerating, so that the low-temperature rust-proof cooling liquid wraps the hub bearing 107 in a detection position, reducing the interference of the external environment temperature on the detection, the detection box 104 is internally provided with a temperature sensor 105 for acquiring reference temperature data of the cooling liquid, as a reference basis for subsequent temperature comparison, and the detection box 104 is provided with a thermal imaging module 106 on one side for acquiring an original thermal imaging view, the thermal imaging module 106 faces the hub bearing 107 in the detection position;

[0063] The detection assembly is used for simulating the working condition of the hub bearing 107, and simultaneously injecting liquid lubricating oil into the hub bearing 107 and acquiring an injection pressure change rate through the pressure sensor 201, wherein the rotating shaft 202 of the detection assembly rotates under the drive of the rotating motor 203, drives the hub bearing 107 sleeved thereon to synchronously rotate, simulates the rotating working condition when a vehicle travels, the oil injection channel continuously injects the heated liquid lubricating oil into the hub bearing 107, and the pressure sensor 201 monitors the pressure change in the oil injection process, and when there is leakage, the pressure change rate will be abnormal;

[0064] The transfer assembly is internally installed at the bottom of the detection box 104 and externally passes through the through groove 103 and is located in the placing cavity, the fixing plate 401 of the transfer assembly is used for placing the hub bearing 107 to be detected, the second waterproof electric sliding block 404 moves on the second sliding rail 403, drives the hub bearing 107 to be transferred between the replacement position in the placing cavity and the detection position in the detection cavity, and when the hub bearing 107 is located in the detection position, the rotating axis of the hub bearing 107 coincides with the rotating axis of the detection assembly, so that the two are coaxially rotated during detection.

[0065] The locking assembly is used for locking and connecting the hub bearing 107 in the detection position and the detection assembly, the locking shaft sleeve 301 is installed at the end of the rotating shaft 202 by moving the third waterproof electric sliding block 318 and driving the waterproof locking motor 304, so that the hub bearing 107 is stably sleeved outside the connecting shaft section 210 of the rotating shaft 202, and displacement is avoided during the detection process.

[0066] Specifically, during detection, the hub bearing 107 is first installed on the fixed plate of the transfer assembly, and is transported to the detection position by the transfer assembly through the slot 103, and is fixed with the detection assembly by the locking assembly; then the detection assembly is started, the rotating shaft 202 rotates under the driving of the rotating motor 203, simulates the actual rotating working condition, and the oil injection channel injects the heated liquid lubricating oil into the hub bearing 107, and the pressure sensor 201 monitors the injection pressure change rate in real time; if the hub bearing 107 has a sealing defect, the heated liquid lubricating oil will leak from the gap to the rust-proof cooling liquid in the detection box 104, because the temperature of the leaked lubricating oil is higher than that of the cooling liquid, a local high-temperature area will be formed around the leakage point, the thermal imaging module 106 captures the high-temperature area by shooting the original thermal imaging view, and in combination with the reference temperature data of the cooling liquid obtained by the temperature sensor 105, the temperature difference between the high-temperature area and the surrounding cooling liquid can be determined, and then the leakage position is located.

[0067] For example, during detection of the hub bearing 107, the rotating shaft 202 continuously rotates, the oil injection channel 212 injects the heated liquid lubricating oil, and the pressure sensor 201 monitors that the injection pressure change rate is abnormal, at this time, in the original thermal imaging view shot by the thermal imaging module 106, an obvious high-temperature area appears at the position corresponding to the sealing lip of the hub bearing 107, the temperature of the area is compared with the reference temperature of the cooling liquid obtained by the temperature sensor 105, it is confirmed that the high-temperature area is caused by the leaked lubricating oil, and thus it is determined that the leakage position is at the sealing lip, and the problem that the leakage position is not accurately positioned by the traditional sealing detection device is solved.

[0068] The control module 108 is installed on the openable door plate 109 on one side of the experiment box 101, detection personnel can input detection parameters and issue a start instruction through the operation interface on the door plate, and the control module 108 receives the instruction and coordinates the operation of each component to realize the control of the sealing detection of the hub bearing 107.

[0069] Specifically, the control module 108 receives the starting instruction input by the detection personnel and the preset detection parameters when detecting the hub bearing 107, and then activates the components in sequence for cooperative operation: the second waterproof electric sliding block 404 of the transfer assembly moves in the vertical direction on the second sliding rail 403, driving the lifting frame 405 at the top and the hub bearing 107 fixed on the fixed plate 401 to descend, the fixed plate 401 is connected with the hub bearing 107 through the fixing screws, so that the hub bearing 107 cannot shake during the transfer process, when the hub bearing 107 reaches the height level with the detection position, the second waterproof electric sliding block 404 stops moving, and the hub bearing 107 is transported from the replacement position in the placement cavity to the detection position in the detection cavity through the through groove 103 on the partition plate 102; after the hub bearing 107 reaches the detection position, the control module 108 sends a signal to the detection assembly, so that the first waterproof electric sliding block 206 moves on the first sliding rail 205 towards the hub bearing 107, driving the rotating shaft 202 to horizontally approach until one end of the rotating shaft 202 penetrates into the inner ring of the hub bearing 107, so that the hub bearing 107 is sleeved outside the connecting shaft section 210 on the rotating shaft 202, the outer peripheral surface of the connecting shaft section 210 is tightly fitted with the inner ring of the hub bearing 107, so that the two are synchronously rotated; then the third waterproof electric sliding block 318 of the locking assembly moves on the third sliding rail 317 to adjust the horizontal position of the locking assembly, and the waterproof lifting motor 323 is started to drive the lifting column 303 to move up and down along the lifting sliding groove 320 of the lifting platform 319 through the meshing transmission of the gear and the rack 322 on the lifting column 303, so that the axis of the locking shaft sleeve 301 coincides with the axes of the rotating shaft 202 and the hub bearing 107, then the waterproof locking motor 304 is started to drive the rotating plate 305 and the slide plate 307 to rotate, the locking shaft sleeve 301 is rotated into the end portion of the rotating shaft 202, the hub bearing 107 is axially locked on the connecting shaft section 210, after locking, the control module 108 drives the waterproof electric telescopic rod 311 to extend and retract, driving the grabbing plate 309 to open along the first sliding groove 308 to loosen the locking shaft sleeve 301, and then the locking assembly is moved to the avoiding position on the side of the detection position through the cooperation of the third waterproof electric sliding block 318 and the waterproof lifting motor 323, so as to avoid interfering with the subsequent detection action.

[0070] Further, after the locking is completed, the control module 108 starts the detection assembly: controls the heating of the heat pipe heater 215 in the heating box 213, heats the liquid lubricating oil flowing in the heating pipe 214, makes the temperature of the lubricating oil higher than the temperature of the antirust coolant in the detection box 104, and at the same time starts the oil pump 218 to pump the lubricating oil in the oil storage tank 217 into the heating pipe 214 for heating, and then through the rotating joint to the rotating shaft 202 and the oil injection channel 212 on the connecting shaft section 210, and continuously injects into the hub bearing 107. The pressure sensor 201 monitors the pressure change in the oil injection channel 212 in real time and calculates the injection pressure change rate, which is transmitted to the control module 108; at the same time, the rotating motor 203 is started to drive the rotating shaft 202 to rotate around its axis through two sets of meshing gear transmissions, and then drive the hub bearing 107 sleeved on the connecting shaft section 210 to rotate synchronously, simulating the rotating condition of the vehicle during driving; in this process, the control module 108 receives the injection pressure change rate transmitted by the pressure sensor 201 in real time, and continuously monitors the reference temperature data of the coolant collected by the temperature sensor 105, which provides a reference for subsequent thermal imaging analysis.

[0071] It should be noted that when the injection pressure change rate exceeds the preset threshold, the control module 108 triggers the shutdown protocol and immediately executes the shutdown operation: closes the rotating motor 203 to stop the rotation of the rotating shaft 202, so as to avoid continuous rotation and expand the leakage range; at the same time, the thermal imaging module 106 is started to continuously shoot for 5 seconds at the shooting frequency set by itself, and a plurality of original thermal imaging views covering the hub bearing 107 and the surrounding area are obtained; then, the control module 108 calls the pre-stored temperature-gray scale table to convert the original thermal imaging view into a temperature field view, combines the reference temperature data of the coolant obtained by the temperature sensor 105, extracts the peak temperature rise area higher than the reference temperature, and verifies the temperature decay path by constructing the thermal gradient vector field and the divergence distribution map, finally obtains the coordinates of the leakage point, and compares the coordinates with the projection view of the three-dimensional model of the hub bearing, and outputs the specific leakage position parameters.

[0072] Please refer to Figure 3 and Figure 4As shown, the detection assembly includes a rotating shaft 202 and a rotating motor 203 for simulating the working condition of the hub bearing 107. A first mounting base 204 is arranged in the detection box 104 and fixed to the bottom of the detection box 104 to provide support for the detection assembly. Two groups of first sliding rails 205 are arranged in parallel on the top of the first mounting base 204 and extend towards or away from the detection position. When the detection assembly approaches the detection position, one end of the rotating shaft 202 can be arranged in the hub bearing 107 at the detection position. Two groups of first waterproof electric sliding blocks 206 are arranged on the two groups of first sliding rails 205, respectively. The first waterproof electric sliding blocks 206 can slide along the first sliding rails 205. The top of each of the two groups of first waterproof electric sliding blocks 206 is fixedly connected with a first moving frame 207. The first moving frame 207 can be synchronously moved by the sliding of the first waterproof electric sliding blocks 206. A waterproof box 208 is arranged on one side of the first moving frame 207. The waterproof box 208 has a sealed structure and is used for isolating the rust-proof cooling liquid in the detection box 104 to protect the internal components. The rotating motor 203 is fixed in the waterproof box 208. The rotating motor 203 outputs power to drive the rotating shaft 202 to rotate around its axis. A through hole is formed in the side of the waterproof box 208 facing the detection position. The rotating shaft 202 is arranged in the through hole. One end of the rotating shaft 202 is located in the waterproof box 208, and the other end of the rotating shaft 202 extends out of the waterproof box 208. The one end of the rotating shaft 202 located in the waterproof box 208 is connected with the main shaft of the rotating motor 203 through two groups of meshing gears. The gear transmission can transmit the power of the rotating motor 203 to the rotating shaft 202 to drive the rotating shaft 202 to rotate. The part of the rotating shaft 202 extending out of the waterproof box 208 is provided with a connecting shaft section 210 for connecting with the hub bearing 107. The outer diameter of the connecting shaft section 210 is matched with the inner diameter of the inner ring of the hub bearing 107, so that the hub bearing 107 can be sleeved. A sealing bearing 211 is arranged in the through hole corresponding to the rotating shaft 202. The inner ring of the sealing bearing 211 is tightly attached to the outer circumferential surface of the rotating shaft 202, and the outer ring is fixed to the inner wall of the through hole. The sealing bearing 211 can ensure smooth rotation of the rotating shaft 202 and prevent the rust-proof cooling liquid from penetrating into the waterproof box 208 through the through hole.

[0073] Specifically, in use, when the transfer assembly transports the hub bearing 107 to the detection position and adjusts to be coaxial with the rotating shaft 202, the control module 108 controls the first waterproof electric sliding block 206 to move along the first sliding rail 205 to the detection position, driving the first moving frame 207, the waterproof box 208 and the rotating shaft 202 to synchronously approach the hub bearing 107, so that the rotating shaft 202 protruding from one end of the waterproof box 208 penetrates the inner ring of the hub bearing 107, until the hub bearing 107 is sleeved outside the connecting shaft segment 210, at this time, the outer peripheral surface of the connecting shaft segment 210 is attached to the inner ring of the hub bearing 107, and the connection is completed; then, the rotating motor 203 is started, the main shaft thereof drives the gear engaged therewith to rotate, the rotating shaft 202 is driven to rotate around its own axis through gear transmission, and in turn drives the hub bearing 107 sleeved on the connecting shaft segment 210 to synchronously rotate, so as to simulate the rotating working condition of the hub bearing 107 when the vehicle is running; in this process, the sealing structure of the waterproof box 208 cooperates with the sealing bearing 211 to block the rust-proof cooling liquid in the detection box 104 from entering the waterproof box 208, so as to avoid damage of the rotating motor 203 due to damp.

[0074] For example, when the hub bearing 107 is detected, the first waterproof electric sliding block 206 moves along the first sliding rail 205, so that the rotating shaft 202 penetrates the inner ring of the hub bearing 107 and is sleeved on the connecting shaft segment 210, after the rotating motor 203 is started, the rotating shaft 202 is driven to rotate at a set speed through gear transmission, the hub bearing 107 rotates synchronously with the rotating shaft 202, during which the waterproof box 208 is effectively isolated from the rust-proof cooling liquid by the sealing bearing 211, and the stable operation of the rotating motor 203 is ensured, thereby providing reliable power for simulating the actual working condition.

[0075] Please refer to Figure 4As shown, the detection assembly further comprises an oil injection channel 212 for injecting liquid lubricating oil into the hub bearing 107. The rotating shaft 202 and the connecting shaft section 210 are internally provided with the oil injection channel 212 extending along the axial direction. The oil outlet end of the oil injection channel 212 is provided on the outer circumferential surface of the connecting shaft section 210 and corresponds to the inner side of the sealing device of the hub bearing 107, so that the injected liquid lubricating oil can directly act on the sealing device to test the sealing performance. When injecting oil, the flow direction of the liquid lubricating oil in the oil injection channel 212 is from the oil inlet end to the oil outlet end of the oil injection channel 212. The waterproof box 208 is internally fixed with a heating box 213. The heating box 213 is of a closed structure and internally provided with a heating pipe 214 and a heat pipe type heater 215. The heating pipe 214 is in a serpentine distribution to increase the heating area. The heat pipe type heater 215 is wrapped around the circumferential side of the heating pipe 214 and heats the liquid lubricating oil in the heating pipe 214 through heat conduction, so that the temperature of the lubricating oil is higher than that of the rust-proof cooling liquid in the detection box 104, thereby forming a significant temperature difference. The bottom of the heating pipe 214 is provided with a pressure sensor 201 which is in communication with the inside of the heating pipe 214 and is used for monitoring the oil pressure change in the heating pipe 214 in real time and then calculating the injection pressure change rate. One end of the heating pipe 214 is connected to the oil inlet end of the oil injection channel 212 through a rotating joint. The rotating joint can rotate with the rotating shaft 202 while keeping the oil passage unblocked to avoid pipeline winding. The waterproof box 208 is further provided with an oil storage tank 217. The oil storage tank 217 is used for storing the liquid lubricating oil to be injected. The top of the oil storage tank 217 is provided with an oil pump 218. The oil inlet of the oil pump 218 is in communication with the bottom of the oil storage tank 217 through a pipeline, and the oil outlet is connected to the other end of the heating pipe 214 through a pipeline, thereby forming a lubricating oil circulation passage.

[0076] Specifically, in use, when the hub bearing 107 is sleeved on the connecting shaft section 210 and is locked, the control module 108 starts the oil pump 218 to pump the liquid lubricating oil in the oil storage tank 217 into the heating pipe 214. At the same time, the heat pipe type heater 215 is powered to generate heat, which is transmitted to the internal lubricating oil through the surrounding heating pipe 214, so that the temperature of the lubricating oil is increased. The heated lubricating oil flows into the oil injection channel 212 through the rotating joint, is transported to the oil outlet end along the channel in the rotating shaft 202 and the connecting shaft section 210, and is directly injected into the inner side of the sealing device of the hub bearing 107 to form a continuous pressure on the sealing device. In this process, the pressure sensor 201 monitors the oil pressure in the heating pipe 214 in real time. When the sealing device of the hub bearing 107 leaks, the lubricating oil will flow out from the sealing gap, causing the pressure in the heating pipe 214 to fluctuate. The pressure sensor 201 transmits the pressure change signal to the control module 108 for judging whether there is a leak.

[0077] For example, when the wheel hub bearing 107 is being tested, the oil pump 218 pumps the lubricating oil in the oil reservoir 217 into the heating pipe 214. The heat pipe heater 215 works to raise the temperature of the lubricating oil to the set value. The heated lubricating oil is injected into the inside of the bearing sealing device through the oil injection channel 212. If there is a gap in the lip of the sealing device, the lubricating oil will leak from the gap into the anti-rust coolant. At this time, the pressure sensor 201 detects an abnormal change rate in the injection pressure, and the control module 108 triggers the subsequent testing process accordingly.

[0078] Please see as follows Figure 7 and Figure 8 As shown, the locking assembly includes a locking sleeve 301 that locks the hub bearing 107 onto the connecting shaft section 210. A second mounting base 302 is provided inside the detection box 104. A lifting column 303 is positioned above the second mounting base 302. A waterproof locking motor 304 is positioned on one side of the lifting column 303. The waterproof locking motor 304 is used to mount the locking sleeve 301 onto one side of the connecting shaft section 210. A rotating plate 305 is connected to the shaft end of the waterproof locking motor 304. A gripping structure for gripping the locking sleeve 301 is provided on one side of the rotating plate 305. The gripping structure includes a slide plate 307. One side of the rotating plate 305 is connected to the slide plate 307 via multiple sets of connecting rods 306. Multiple sets of radially arranged first sliding grooves 308 are provided on the slide plate 307. One end of each set of gripping plates 309... The locking bushing 301 is gripped by sliding rod 310 and first sliding groove 308. A slide cylinder 324 is provided on one side of slide plate 307 and a waterproof electric telescopic rod 311 is provided on one side of rotating plate 305. One end of the waterproof electric telescopic rod 311 is connected to a driving block 312. Multiple sets of second sliding grooves 313 are opened around the slide cylinder 324 and are evenly distributed around the slide cylinder 324. Multiple sets of first rotating seats 314 are provided around the driving block 312 and slide through multiple sets of second sliding grooves 313 respectively. Two sets of second rotating seats 315 are provided at the bottom of gripping plate 309. The two sets of second rotating seats 315 are connected to two sets of first rotating seats 314 in the second sliding groove 313 respectively through two sets of connecting rods 316.

[0079] The top of the second mounting base 302 is provided with two groups of third sliding rails 317, each of which is provided with a third waterproof electric sliding block 318, and the top of each of the two groups of third waterproof electric sliding blocks 318 is connected with a lifting platform 319. The lifting platform 319 is provided with a lifting sliding groove 320 at the top, and the lifting column 303 is slidably arranged in the lifting sliding groove 320. The lifting column 303 is used to move the locking shaft sleeve 301 and the waterproof locking motor 304 to a detection position or an avoiding position in the detection cavity. When the locking shaft sleeve 301 and the waterproof locking motor 304 are located at the detection position, the rotation axis thereof coincides with the rotation axis of the hub bearing 107 located at the detection position and the rotation axis of the detection assembly. When the locking shaft sleeve 301 and the waterproof locking motor 304 are located at the avoiding position, the rotation axis thereof does not coincide with the rotation axis of the hub bearing 107 located at the detection position and the rotation axis of the detection assembly.

[0080] The lifting column 303 is provided with a rack 322 on one side, and the lifting platform 319 is provided with a waterproof lifting motor 323 on one side. The waterproof lifting motor 323 is provided with a gear on the main shaft, which is engaged with the rack 322.

[0081] Specifically, through the arrangement of the locking assembly, when the hub bearing 107 is located at the detection position, the first waterproof electric sliding block 206 moves on the first sliding rail 205, so that one end of the rotating shaft 202 penetrates through the inner ring of the hub bearing 107, and the hub bearing 107 is sleeved outside the connecting shaft section 210 on the rotating shaft 202. The waterproof lifting motor 323 is started to engage with the rack 322 on the lifting column 303 through the gear, so as to drive the lifting column 303 to move up and down along the lifting sliding groove 320 at the top of the lifting platform 319, adjust the height of the waterproof locking motor 304, so that the axis of the locking shaft sleeve 301 coincides with the axis of the rotating shaft 202. The third waterproof electric sliding block 318 moves on the third sliding rail 317, and the waterproof locking motor 304 is started, the main shaft of which drives the rotating plate 305, the slide plate 307 and the plurality of grabbing plates 309 to rotate, installs the locking shaft sleeve 301 at one end of the rotating shaft 202, axially locks the hub bearing 107 on the connecting shaft section 210, completes the installation and fixation, reduces the detection data distortion caused by bearing displacement, reduces the detection error caused by improper installation, and can adapt to hub bearings 107 of different specifications through structural adjustment.

[0082] Please refer to Figure 7 and Figure 8As shown, the locking assembly comprises a locking sleeve 301 for locking the hub bearing 107 on the connecting shaft section 210, the inner wall of the locking sleeve 301 is provided with a connecting structure matched with the outer periphery of the end of the connecting shaft section 210, which can be screwed with the connecting shaft section 210, and a second mounting base 302 is arranged in the detection box 104, the second mounting base 302 is fixed on the bottom of the detection box 104 to provide support for the locking assembly, and a lifting column 303 is arranged above the second mounting base 302, the lifting column 303 can move in the vertical direction, and a waterproof locking motor 304 is arranged on one side of the lifting column 303, the waterproof locking motor 304 is designed with a sealed shell to prevent rust-preventing coolant from seeping in, and the waterproof locking motor 304 is used to drive the locking sleeve 301 to rotate and is installed on one side of the connecting shaft section 210, the shaft end of the waterproof locking motor 304 is fixedly connected with a rotating plate 305 through a shaft coupling, the rotating plate 305 rotates synchronously with the main shaft of the waterproof locking motor 304, one side of the rotating plate 305 is connected with a slide plate 307 through a plurality of connecting rods 306, the plurality of connecting rods 306 are evenly distributed along the circumference of the rotating plate 305 to keep the slide plate 307 rotating synchronously with the rotating plate 305, a plurality of first sliding grooves 308 are arranged on the slide plate 307 in a radial manner, the plurality of first sliding grooves 308 diverge outward from the center of the slide plate 307, one end of a plurality of grabbing plates 309 is slidably connected with the first sliding grooves 308 through sliding rods 310, the sliding rods 310 can freely slide in the first sliding grooves 308, so that the grabbing plates 309 can move radially along the first sliding grooves 308 to realize grabbing and releasing of the locking sleeve 301, a slide cylinder 324 is arranged on one side of the slide plate 307, the slide cylinder 324 is fixed coaxially with the slide plate 307, a waterproof electric telescopic rod 311 is arranged on one side of the rotating plate 305, the waterproof electric telescopic rod 311 is also designed with a sealed shell, and one end of the waterproof electric telescopic rod 311 is connected with a driving block 312, the driving block 312 is annularly sleeved on the outer periphery of the slide cylinder 324, a plurality of second sliding grooves 313 are arranged on the circumferential side of the slide cylinder 324, the plurality of second sliding grooves 313 are evenly distributed along the circumferential side of the slide cylinder 324, a plurality of first rotating seats 314 are arranged on the circumferential side of the driving block 312, the plurality of first rotating seats 314 are respectively slidably arranged in the plurality of second sliding grooves 313, the first rotating seats 314 can slide in the second sliding grooves 313 and rotate around their own axes, two second rotating seats 315 are arranged on the bottom of the grabbing plates 309, the two second rotating seats 315 are respectively connected with two first rotating seats 314 in the second sliding grooves 313 through two connecting rods 316, when the waterproof electric telescopic rod 311 is extended or retracted, the driving block 312 moves along the axial direction of the slide cylinder 324, the grabbing plates 309 are driven to slide in the first sliding grooves 308 through the connecting rods 316, and the grabbing plates 309 are opened and closed.

[0083] The second mounting base 302 is provided with two groups of third sliding rails 317 on the top, which are arranged in parallel along the direction of approaching or moving away from the detection position, and each of the two groups of third sliding rails 317 is provided with a third waterproof electric sliding block 318, which can slide along the third sliding rail 317. The top of each of the two groups of third waterproof electric sliding blocks 318 is fixedly connected with a lifting platform 319. The lifting platform 319 can be synchronously moved by the sliding of the third waterproof electric sliding block 318. The lifting platform 319 is provided with a lifting sliding groove 320 on the top. The bottom of the lifting column 303 is provided with a sliding block matched with the lifting sliding groove 320. The sliding block slides through the lifting sliding groove 320, so that the lifting column 303 can slide up and down along the lifting sliding groove 320. The lifting column 303 is used for moving the locking shaft sleeve 301 and the waterproof locking motor 304 to the detection position or the avoiding position in the detection cavity. When the locking shaft sleeve 301 and the waterproof locking motor 304 are located at the detection position, the rotation axis line thereof coincides with the rotation axis line of the hub bearing 107 located at the detection position and the rotation axis line of the detection assembly, so that the locking shaft sleeve 301 can be accurately connected with the connecting shaft section 210. When the locking shaft sleeve 301 and the waterproof locking motor 304 are located at the avoiding position, the rotation axis line thereof does not coincide with the rotation axis line of the hub bearing 107 located at the detection position and the rotation axis line of the detection assembly, so as to avoid interference with the rotation of the hub bearing 107 during the detection process. One side of the lifting column 303 is provided with a rack 322 extending along the length direction of the lifting column 303. One side of the lifting platform 319 is provided with a waterproof lifting motor 323. A gear is arranged on the main shaft of the waterproof lifting motor 323 and meshes with the rack 322. When the waterproof lifting motor 323 rotates, the lifting column 303 can be driven to move up and down along the lifting sliding groove 320 through the meshing transmission of the gear and the rack 322.

[0084] Specifically, after the axis line of the locking shaft sleeve 301 coincides with the axis line of the rotating shaft 202 and the hub bearing 107 by driving the lifting column 303 to move up and down along the lifting sliding groove 320, the third waterproof electric sliding block 318 is started to move along the third sliding rail 317 to the detection position, so as to drive the lifting platform 319 and the lifting column 303, the waterproof locking motor 304 and the locking shaft sleeve 301 on the lifting platform 319 to synchronously approach the detection position, until the locking shaft sleeve 301 is aligned with the end of the connecting shaft section 210, and then the waterproof locking motor 304 is driven to rotate the locking shaft sleeve 301, so as to install the locking shaft sleeve 301 on one end of the rotating shaft 202, complete the installation and fixation of the hub bearing 107, and then the waterproof electric telescopic rod 311 is started to extend, so as to drive the driving block 312 to move along the axial direction of the sliding groove cylinder 324, drive the groups of grabbing plates 309 to open outward along the first sliding groove 308 through the connecting rod 316, loosen the locking shaft sleeve 301, and reversely move the third waterproof electric sliding block 318 and the lifting column 303, so as to retreat the locking assembly to the avoiding position, and avoid affecting the subsequent detection.

[0085] Please refer toFigure 5 With Figure 6 As shown in the figure, the transport assembly includes a fixed plate 401 for placing the hub bearing 107, the bottom of the transport bracket 402 is fixed in the bottom of the detection box 104 by bolts, the top extends upward and passes through the through slot 103 on the partition plate 102, and is located in the placement cavity. The transport bracket 402 has an L-shaped structure, one side of the vertical part of which is provided in parallel with two groups of second sliding rails 403 extending in the vertical direction. Two groups of second waterproof electric sliding blocks 404 are arranged on one side of each of the two groups of second sliding rails 403. Four groups of second waterproof electric sliding blocks 404 can slide along the corresponding second sliding rails 403 respectively. Four groups of second waterproof electric sliding blocks 404 are fixedly connected with the lifting frame 405 on one side. Through the synchronous sliding of the four groups of second waterproof electric sliding blocks 404, the lifting frame 405 can be driven to make vertical lifting movement along the second sliding rails 403. The fixed plate 401 is rotatably arranged on one side of the lifting frame 405 through a bearing. The fixed plate 401 can rotate around the bearing axis. A plurality of fixing holes 406 are formed in one side of the fixed plate 401 and are evenly distributed along the circumference. The hub bearing 107 is connected with the plurality of fixing holes 406 through a plurality of fixing screws, so that the hub bearing 107 remains relatively fixed with the fixed plate 401 during transportation.

[0086] Specifically, in use, when the hub bearing 107 to be detected needs to be transported from the replacement position to the detection position, the control module 108 first controls the second waterproof electric sliding block 404 to slide upward along the second sliding rail 403, drives the lifting frame 405 and the fixed plate 401 to rise to the replacement position in the placement cavity. At this time, the fixing holes 406 of the fixed plate 401 are in a horizontal position. The detection personnel places the hub bearing 107 on the fixed plate 401 and connects and fixes the hub bearing 107 with the fixing holes 406 through a plurality of fixing screws. Then the second waterproof electric sliding block 404 is controlled to slide downward along the second sliding rail 403, driving the fixed plate 401 and the hub bearing 107 to descend and enter the detection cavity through the through slot 103. When the hub bearing 107 descends to the same height as the rotating shaft 202 of the detection assembly, the second waterproof electric sliding block 404 stops sliding. At this time, the axis of the hub bearing 107 coincides with the axis of the rotating shaft 202. Then the first waterproof electric sliding block 206 of the detection assembly moves along the first sliding rail 205, so that the rotating shaft 202 penetrates the inner ring of the hub bearing 107 and is sleeved outside the connecting shaft section 210, completing the butt joint of the hub bearing 107 and the rotating shaft 202. Then the locking assembly locks the hub bearing 107 on the connecting shaft section 210. Then the second waterproof electric sliding block 404 of the transport assembly continues to descend by a small distance, so that the fixed plate 401 is separated from the hub bearing 107. Then the second waterproof electric sliding block 404 is controlled to rise to the avoiding position, so as to avoid interference with the subsequent detection.

[0087] As shown in the figure, Figures 9 to 11As shown, the application also provides a positioning method of the hub bearing sealing detection device, comprising the following steps:

[0088] Step S10: obtaining the injection pressure change rate based on the pressure sensor 201, triggering the shutdown protocol according to the injection pressure change rate and outputting the leakage trigger flag;

[0089] Specifically, the injection pressure change rate refers to the pressure change amount of the liquid lubricating oil in the injection channel 212 per unit time. The pressure data in the heating pipe 214 is collected in real time by the pressure sensor 201, and the control module 108 calculates the pressure data collected continuously to obtain the pressure difference per unit time, which reflects the pressure fluctuation of the injection system. If the sealing device of the hub bearing 107 has a leakage, the liquid lubricating oil will flow out from the gap, causing the pressure in the injection channel 212 to drop, and the injection pressure change rate will abnormally fluctuate. The shutdown protocol is a set of operation procedures preset by the control module 108. When the injection pressure change rate exceeds the set normal range, the control module 108 starts the process, including stopping the rotation of the motor 203, stopping the work of the oil pump 218 to interrupt the injection, starting the shooting of the thermal imaging module 106, etc. Its role is to avoid continuous rotation or injection to expand the leakage range, and at the same time capture the thermal imaging data under the leakage state in time. The leakage trigger flag is a state signal output by the control module 108, which is used to identify whether a possible leakage is detected. The flag is a binary signal. For example, when no abnormality is detected, the flag is "0", indicating no leakage. When the injection pressure change rate exceeds the threshold, the flag is switched to "1", indicating that the leakage detection process is triggered, and the subsequent steps of temperature field analysis and leakage point positioning are all taken as the starting signal of the flag.

[0090] For example, when the hub bearing 107 is detected, the pressure sensor 201 collects the pressure data in the heating pipe 214 every 0.5 seconds, and the control module 108 calculates the injection pressure change rate under normal conditions to be stable within 0.2 kPa / s. When the sealing lip of the hub bearing 107 has a gap, the liquid lubricating oil leaks from the gap, and the pressure data collected by the pressure sensor 201 drops from 200 kPa to 195 kPa within 1 second, and the calculated injection pressure change rate is 5 kPa / s, which exceeds the preset normal range (0.2 kPa / s). At this time, the control module 108 triggers the shutdown protocol, immediately stops the rotation of the motor 203 and the oil pump 218, and switches the leakage trigger flag from "0" to "1", informing the system to enter the leakage positioning stage, providing a starting signal for subsequent acquisition of the original thermal imaging view by the thermal imaging module 106.

[0091] Step S20: based on the leakage trigger flag, the thermal imaging module 106 is activated to acquire a plurality of frames of original thermal imaging views, a pre-stored temperature-gray scale table is acquired, and the plurality of frames of original thermal imaging views are converted into a plurality of frames of temperature field views according to the temperature-gray scale table, wherein the temperature field views are represented by temperature points;

[0092] Specifically, based on the plurality of frames of original thermal imaging views, pixel points in each frame of original thermal imaging view are extracted, a pre-calibrated temperature-gray scale table is loaded, and each pixel is subjected to table lookup conversion, so that each pixel point is converted into a temperature point according to the temperature-gray scale table, thereby obtaining the plurality of frames of temperature field views.

[0093] Further, when the leakage trigger flag is switched from "0" to "1", the control module 108 sends a start signal to the thermal imaging module 106, and the thermal imaging module 106 starts continuous shooting of the hub bearing 107 and the surrounding area of the detection position at a shooting frequency set by itself, thereby acquiring a plurality of frames of original thermal imaging views. The original thermal imaging views represent the temperature distribution of different areas by gray scale values, and the high and low of the gray scale values correspond to the high and low of the temperature, which are used to record the heat distribution state when the leakage occurs.

[0094] For example, if the shooting frequency of the thermal imaging module 106 is 2 frames per second, and the continuous shooting lasts for 5 seconds, 10 frames of original thermal imaging views can be acquired, each frame of view contains 1920x1080 pixel points, and the gray scale value of each pixel point ranges from 0 to 255. The area corresponding to the leakage point has a relatively higher gray scale value than other areas due to a higher temperature. For example, the gray scale value of the pixel near the leakage point in a certain frame of view is 200, while the gray scale value of the surrounding coolant area is 50.

[0095] It should be noted that the temperature-gray scale table is obtained by pre-calibration. In the calibration process, a heat source with a known temperature (such as a heating plate with different temperatures) is placed at the detection position, the thermal imaging module 106 shoots its thermal imaging view, records the gray scale value corresponding to each temperature, establishes a one-to-one correspondence between the gray scale value and the actual temperature, and stores it. For example, the gray scale value 50 corresponds to the temperature 15℃ of the antirust coolant in the detection box 104, the gray scale value 100 corresponds to the temperature 30℃, and the gray scale value 200 corresponds to the temperature 60℃. The role of the table is to convert the abstract gray scale value in the original thermal imaging view into quantifiable temperature data, thereby providing a unified temperature reference for subsequent analysis. The plurality of frames of temperature field views are obtained by converting each pixel point in the original thermal imaging view through the temperature-gray scale table. Each position in each frame of view is represented by a specific temperature value (i.e., a temperature point). For example, in a certain frame of temperature field view, the position corresponding to the sealing lip of the hub bearing 107 displays a temperature point of 55℃, and the position of the surrounding coolant displays a temperature point of 15℃. These temperature points collectively constitute the temperature distribution of the frame of view, which facilitates intuitive analysis of the temperature difference between different areas.

[0096] Step S30: Obtain cooling liquid reference temperature data based on the temperature sensor 105, and obtain a peak temperature rise view based on the number of temperature field views and the cooling liquid reference temperature data;

[0097] In this embodiment, the step S30 includes the following steps:

[0098] Step S300: Extract real-time temperature data of each temperature point in each temperature field view, and obtain a plurality of temperature difference data by subtracting the cooling liquid reference temperature data from the plurality of real-time temperature data;

[0099] The temperature sensor 105 continuously collects the temperature of the anti-rust cooling liquid in the detection box 104, which is the cooling liquid reference temperature data. The cooling liquid reference temperature data serves as a reference for temperature comparison and eliminates the influence of the temperature fluctuation of the cooling liquid itself on the leakage detection. The real-time temperature data is the actual temperature value of each temperature point in the number of temperature field views. By subtracting the cooling liquid reference temperature data from each real-time temperature data, the temperature difference data obtained can directly reflect the temperature rise of the position relative to the cooling liquid. If there is a leakage, the temperature difference data of the leakage point will be significantly higher than that of the surrounding area.

[0100] Step S301: Convert each temperature point in each temperature field view into a temperature difference point according to the corresponding temperature difference data, and generate a plurality of relative temperature rise field views.

[0101] It should be noted that the temperature difference point is a specific presentation form of the temperature difference data, i.e., each position is replaced by a "temperature difference value" instead of an "actual temperature value". For example, if the real-time temperature data of a certain temperature point is 55°C and the cooling liquid reference temperature data is 15°C, the corresponding temperature difference point is 40°C. The relative temperature rise field view highlights the local temperature rise area caused by leakage through the distribution of temperature difference points, avoids the interference of the slight fluctuation of the overall temperature of the cooling liquid on the detection result, and makes the temperature change related to leakage clearer.

[0102] Step S302: Overlap the plurality of temperature rise field views with the plurality of original thermal imaging views, record the highest temperature difference data of the corresponding plurality of temperature difference points at each pixel point position, obtain the highest temperature difference point, and construct the plurality of highest temperature difference points into a peak temperature rise view.

[0103] It can be understood that the overlapping operation can ensure that the temperature difference point corresponds to the pixel position in the original thermal imaging accurately and avoid position deviation. Recording the highest temperature difference data is to capture the maximum temperature rise during the leakage process and reduce the omission caused by the difference in shooting time of a single view. For example, if the temperature difference points of a certain pixel point in 3 views are 35°C, 40°C and 38°C respectively, the highest temperature difference data is 40°C, and the corresponding highest temperature difference point is 40°C. The peak temperature rise view is composed of the highest temperature difference points of all pixel points, which presents the most significant temperature rise area during the leakage process and provides a reliable temperature distribution basis for subsequent positioning of the leakage source.

[0104] For example, the coolant reference temperature data acquired by the temperature sensor 105 is 15℃, and in a certain frame of temperature field view, the real-time temperature data of the same pixel point corresponding to the sealing lip of the hub bearing 107 is 55℃, 53℃ and 54℃ respectively. After step S300, the temperature difference data obtained is 40℃, 38℃ and 39℃ respectively. Step S301 converts these real-time temperature points into temperature difference points of 40℃, 38℃ and 39℃, and generates three frames of relative temperature rise field view, in which the temperature difference point of the pixel point is significantly higher than the surrounding temperature difference points of 2℃-5℃ in each frame. Step S302 overlaps the three frames of relative temperature rise field view with the corresponding original thermal imaging view, records the highest temperature difference data of the pixel point as 40℃ as the highest temperature difference point, and records the highest temperature difference data of other pixel points. Finally, in the peak temperature rise view constructed, the area corresponding to the sealing lip presents a continuous highest temperature difference point of about 40℃, clearly pointing to the leakage position.

[0105] It should be noted that the coolant reference temperature data is acquired and updated in real time by the temperature sensor 105, ensuring the timeliness of the temperature difference calculation and avoiding the influence of temperature change on the temperature difference result due to long-term placement of the coolant. After the temperature field view is converted into the relative temperature rise field view through the temperature difference data, the temperature information unrelated to the leakage (such as the small temperature difference caused by natural convection of the coolant) can be filtered out, so that the analysis focus is concentrated on the temperature rise area caused by the leakage. The peak temperature rise view extracts the highest temperature difference point, eliminates the possible transient interference (such as temperature fluctuation caused by temporary passage of coolant bubbles) in a single frame of view, and ensures the stability of subsequent leakage source positioning.

[0106] Step S40: constructing a thermal gradient vector field based on the peak temperature rise view, and generating a divergence distribution map based on the thermal gradient vector field and the peak temperature rise view;

[0107] In this embodiment, the step S40 includes the following steps:

[0108] Step S400: extracting each highest temperature difference point in the peak temperature rise view, acquiring a horizontal temperature change rate according to the horizontal temperature difference between each highest temperature difference point and an adjacent highest temperature difference point, and acquiring a vertical temperature change rate according to the vertical temperature difference between each highest temperature difference point and the adjacent highest temperature difference point;

[0109] Specifically, each highest temperature difference point in the peak temperature rise view is extracted, a horizontal temperature change rate is obtained according to a horizontal temperature difference between each highest temperature difference point and an adjacent highest temperature difference point, and a vertical temperature change rate is obtained according to a vertical temperature difference between each highest temperature difference point and an adjacent highest temperature difference point; wherein the adjacent highest temperature difference point refers to a neighboring point in the four directions of up, down, left and right around each highest temperature difference point in the peak temperature rise view, the horizontal temperature difference is a temperature difference data difference value of the current highest temperature difference point and the adjacent point on the same horizontal line, and the vertical temperature difference is a temperature difference data difference value of the current highest temperature difference point and the adjacent point on the same vertical line; the horizontal temperature change rate is obtained by dividing the horizontal temperature difference by the horizontal distance between the two points, and the vertical temperature change rate is obtained by dividing the vertical temperature difference by the vertical distance between the two points, both of which together reflect how fast the temperature changes in the horizontal and vertical directions, and if there is a leakage, the temperature change rate near the leakage point will be significantly higher than that of the surrounding area, because the temperature gradually decreases when the high-temperature lubricating oil spreads outward from the leakage point.

[0110] Step S401: generating a vector arrow for each highest temperature difference point according to the corresponding horizontal temperature change rate and vertical temperature change rate, the direction of the vector arrow pointing to the direction of the fastest temperature rise, combining a plurality of vector arrows into a vector arrow diagram, and the vector arrow diagram being a thermal gradient vector field;

[0111] Specifically, a vector arrow is generated for each highest temperature difference point according to the corresponding horizontal temperature change rate and vertical temperature change rate, the direction of the vector arrow pointing to the direction of the fastest temperature rise, a plurality of vector arrows are combined into a vector arrow diagram, and the vector arrow diagram is a thermal gradient vector field; the length of the vector arrow is related to the size of the temperature change rate, the greater the change rate, the longer the arrow, and the degree of temperature change is directly reflected;

[0112] For example, around the highest temperature difference point of the leakage point, the horizontal and vertical temperature change rates are both large, and the generated vector arrow will point to the center of the leakage point, because the temperature gradually decreases outward from the leakage point, and the direction pointing to the leakage point is the direction of the fastest temperature rise; the thermal gradient vector field clearly shows the trend of temperature change through the distribution of the vector arrow, and helps to distinguish the temperature diffusion caused by leakage from the temperature disturbance caused by the flow of cooling liquid.

[0113] Step S402: superimposing the thermal gradient vector field and the peak temperature rise view to obtain a divergence value of each highest temperature difference point, and generating a divergence distribution diagram according to the peak temperature rise view and the divergence value of each highest temperature difference point;

[0114] Specifically, the heat gradient vector field is superimposed with the peak temperature rise view to obtain the divergence value of each highest temperature difference point, and a divergence distribution map is generated according to the peak temperature rise view and the divergence value of each highest temperature difference point; the superposition operation ensures that the vector arrow accurately corresponds to the position of the highest temperature difference point, avoiding position deviation affecting analysis; the divergence value is obtained by calculating the pointing relationship of the vector arrow around each highest temperature difference point, reflecting whether the point is the source of temperature change; the higher the divergence value, the more the number of vector arrows pointing to the point and the more concentrated the pointing, that is, the point is the core area of temperature rise; the lower the divergence value, the more scattered the vector arrows around the point, and even there are arrows away from the point, that is, the point is not the source of temperature rise; the divergence distribution map marks the divergence value of each point with different colors or numerical values, highlighting the high divergence value area, and providing a direct basis for locking the leakage source.

[0115] For example, there is a leakage in the sealing lip of the hub bearing 107, and the highest temperature difference point at the corresponding position in the peak temperature rise view presents a radial distribution centered on the leakage point; in step S400, after extracting these highest temperature difference points, it is found that the highest temperature difference point at the center of the leakage point has a large temperature difference with the adjacent points in the horizontal direction, and the temperature change rate in the horizontal direction is high, and the same is true in the vertical direction; the vector arrows generated in step S401 all point from the surrounding to the center of the leakage point, and the arrow length gradually increases from the periphery to the center; after superposition in step S402, the vector arrows around the highest temperature difference point at the center of the leakage point are highly concentrated, and the divergence value is significantly higher than that in other areas, and the area is marked with a high divergence value in the divergence distribution map, clearly pointing to the position of the leakage point.

[0116] Further, the divergence value is the pointing relationship of the vector arrow, the higher the divergence value, the fewer the vector arrows, and the lower the divergence value, the more the vector arrows; the high and low of the divergence value directly reflects the source characteristics of temperature rise, which can exclude the dispersed temperature rise area formed by the cooling liquid flow driving high-temperature oil droplets, and ensures that the initial position of the leakage is located;

[0117] Step S50: obtaining a plurality of temperature attenuation paths based on the divergence distribution map, and verifying the leakage source confidence of the plurality of temperature attenuation paths to obtain the leakage point coordinates; and obtaining the leakage position parameters of the hub bearing according to the projection view of the hub bearing three-dimensional model and the leakage point coordinates.

[0118] The three-dimensional model of the hub bearing 107 can be obtained in various ways:

[0119] The CAD model is generated by a design software (such as SolidWorks), which contains the size and relative position parameters of each part of the bearing (sealing lip, outer ring, inner ring, joint, etc.), and is used to map the leakage coordinates;

[0120] The three-dimensional point cloud model is obtained by scanning the physical hub bearing 107 by a laser scanner, is composed of three-dimensional coordinates of millions of points, and can restore the fine structure of the bearing surface (such as the curvature of the sealing lip, the concave-convex of the joint), and is suitable for comparison with the detection result of the physical object;

[0121] The SD model (simplified structure model) is obtained by simplifying non-key structures (such as removing chamfers and thread details) on the basis of the CAD model, and retains the positional relationship of core structures such as the sealing device and the joint, and is used for quickly generating a projection view.

[0122] Specifically, the high-divergence-value area in the divergence distribution corresponds to the core area of temperature rise, and the highest-temperature-difference points with divergence values lower than the threshold are screened to construct a candidate point set, in order to focus on the possible leakage source area and exclude non-leakage-related high-temperature points formed by interference such as cooling liquid flow; the threshold is set according to the parameters of the hub bearing being detected, to ensure that the candidate point set covers all potential leakage sources. The temperature decay path is tracked from each candidate point, because the leaked high-temperature lubricating oil will spread around and gradually cool down, and the path can reflect the trajectory of the temperature decrease from the leakage point to the outside, and the tracking is performed with the condition that the temperature difference of adjacent highest-temperature-difference points is lower than the tracking threshold, to avoid deviating from the leakage diffusion direction, until the temperature decreases to 10% of the highest temperature or reaches the cooling liquid surface, the former ensures that the area with a temperature close to the environment is tracked, and the latter prevents the path from being interrupted due to the reflection of the cooling liquid surface, and multiple temperature decay paths together constitute a complete trajectory record of the leakage diffusion.

[0123] Further, the leakage source confidence verification is performed on multiple temperature decay paths, in order to distinguish the real leakage source from the interference signal.

[0124] Specifically, multiple highest-temperature-difference points are randomly selected on each temperature decay path, the average deviation angle of the lines connecting these points is calculated, and if the average deviation angle is close to the direction perpendicular to the sealing surface of the hub bearing 107 (i.e., the perpendicularity verification passes), it indicates that the path conforms to the diffusion law of the lubricating oil after leaking from the sealing gap; otherwise, if the average deviation angle is chaotic, it is determined as an interference signal (such as local high temperature caused by cooling liquid vortex). The verified candidate points are determined as the leakage point coordinates, which reflect the specific position of the leakage in the detection field of view. By combining the coordinates with the projection view of the three-dimensional model of the hub bearing, the coordinates in the field of view can be converted into parameters relative to the bearing structure, including the distance from the sealing lip and the corresponding joint number, so that the leakage position corresponds to the specific structure such as the sealing device and the end cover joint of the bearing.

[0125] For example, in the detection of the hub bearing 107, the divergence distribution map shows that there are multiple high-divergence value points with the highest temperature difference near the sealing lip, and the candidate point set constructed after screening contains 3 candidate points; starting from each candidate point, the temperature decay path is tracked, among which 2 paths show a gradual temperature drop from the candidate point to the surrounding, and the endpoint temperature drops to 10% of the highest temperature, and the other path is interrupted early due to the interference of the cooling liquid bubble in the middle; the confidence of the first 2 paths is verified, 5 highest temperature difference points are randomly selected to calculate the average deviation angle, and it is found that the average deviation angle of one of the paths is perpendicular to the sealing lip surface (vertical characteristic verification passes), and the other path is determined to be interference due to large angle deviation; the verified candidate point is determined as the leakage point coordinate, and after comparing the coordinate with the projection view of the hub bearing three-dimensional model, the output leakage position parameter is clearly pointed to the third joint between the sealing lip and the outer ring.

[0126] It can be understood that by converting the original thermal imaging view into a temperature field view, combining with the peak temperature rise view extracted from the cooling liquid reference temperature data obtained by the temperature sensor 105, the highest temperature difference area can be focused, and irrelevant temperature fluctuations caused by convection, bubbles, etc. in the low-temperature antirust cooling liquid environment are filtered out, so that the analysis range is concentrated in the possible leakage area; by constructing a thermal gradient vector field and generating a divergence distribution map, the core area with the fastest temperature rise can be clearly determined by using the vector arrows generated by the temperature change rate in the horizontal and vertical directions, and the temperature diffusion interference caused by the cooling liquid flow is excluded, so that the specific position of the leakage source is locked from the temperature change law; and the tracking and confidence verification of the temperature decay path further filter out the real leakage source through the physical law of leakage diffusion, avoid misjudgment, and finally combine the projection view of the hub bearing three-dimensional model, so that the detection result can be directly related to the specific structure of the hub bearing 107, solving the problem that the traditional sealing detection device can only determine whether there is leakage but cannot locate the specific leakage position.

[0127] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A wheel hub bearing tightness detection device, characterized by, The utility model relates to a kind of wheel hub bearing leakproofness detection device. The utility model provides: Experimental box, the experimental box is formed by setting partition in experimental box, and the detection cavity is communicated by the through slot of partition; Detection box, the detection box is set in the bottom of detection cavity and is filled with rustproof coolant inside, cooling mechanism is installed in detection box, cooling mechanism is cooled to the rustproof coolant filled in detection box, temperature sensor for obtaining coolant reference temperature data is set in detection box, and thermal imaging module for obtaining original thermal imaging view is set in one side of detection box; Detection assembly, detection assembly is used to simulate the working condition of wheel hub bearing, and liquid lubricating oil is injected into wheel hub bearing, and the injection pressure change rate is obtained by pressure sensor; Transfer assembly, transfer assembly is installed in detection box in bottom, and top passes through through slot and is located in the placement cavity, transfer assembly is used to transport wheel hub bearing to be detected to the replacement position in placement cavity or the detection position in detection cavity, when wheel hub bearing is located in the detection position, its rotation axis coincides with the rotation axis of detection assembly, and thermal imaging module is located in the rotation axis of detection assembly one end; Locking assembly, locking assembly is used to lock the wheel hub bearing of detection position and detection assembly; Control module, control module is installed on the switchable door plate of one side of experimental box, and control module is used to control the operation of the detection device; Detection assembly further includes oil injection channel for injecting liquid lubricating oil into wheel hub bearing, and oil injection channel is set on rotating shaft and connecting shaft section corresponding to wheel hub bearing, the position of sealing structure on wheel hub bearing corresponds with the oil outlet end of oil injection channel, heating tank is set in waterproof tank, heating pipe and heat pipe type heater are set in heating tank, heat pipe type heater is surrounded around heating pipe and heats the lubricating oil transported by heating pipe, pressure sensor is set in the bottom of heating pipe, one end of heating pipe is connected with the oil inlet end of oil injection channel through rotating joint, and oil storage tank is set in waterproof tank, oil pump is set in the top of oil storage tank, and the other end of heating pipe is connected with oil storage tank through pipeline.

2. The wheel hub bearing leakproofness detection device according to claim 1, wherein: The detection assembly comprises a rotating shaft and a rotating motor for simulating the working condition of the wheel hub bearing, a first mounting base is arranged in the detection box, two groups of first sliding rails are arranged on the top of the first mounting base, two groups of first waterproof electric sliding blocks are arranged on the two groups of first sliding rails respectively, the top of the two groups of first waterproof electric sliding blocks is connected with a first moving frame, a waterproof tank is arranged on one side of the first moving frame, a rotating motor is arranged in the waterproof tank, and the rotating motor is used to drive the rotating shaft to rotate around its axis; A through hole is arranged on one side of the waterproof tank, a rotating shaft is arranged in the through hole, the rotating shaft is connected with the main shaft of the rotating motor through two groups of meshing gears, a connecting shaft section for connecting with the wheel hub bearing is arranged on the rotating shaft, and a sealing bearing is arranged in the through hole corresponding to the rotating shaft.

3. The wheel hub bearing leakproofness detection device according to claim 2, wherein: The locking assembly comprises a locking sleeve for locking the hub bearing on the connecting shaft section, a second mounting base is arranged in the detection box, a lifting column is arranged above the second mounting base, a waterproof locking motor is arranged on one side of the lifting column, the waterproof locking motor is used to install the locking sleeve on one side of the connecting shaft section, a rotating plate is connected to the shaft end of the waterproof locking motor, a grabbing structure and a waterproof electric telescopic rod are arranged on one side of the rotating plate, and the waterproof electric telescopic rod is used to drive the grabbing structure to grab the locking sleeve; A lifting platform is connected to the top of the two third waterproof electric sliding blocks, a lifting sliding groove is formed in the top of the lifting platform, and the lifting column is slidably arranged in the lifting sliding groove. The lifting column is used to move the grabbing structure and the waterproof locking motor to a detection position or an avoiding position in the detection cavity. When the grabbing structure and the waterproof locking motor are located at the detection position, the rotating axis thereof coincides with the rotating axis of the hub bearing located at the detection position and the rotating axis of the detection assembly. A rack is arranged on one side of the lifting column, and a waterproof lifting motor is arranged on one side of the lifting platform. A gear is arranged on the main shaft of the waterproof lifting motor and is engaged with the rack.

4. The hub bearing sealing detection device according to claim 1, characterized in that: The transfer assembly comprises a fixing plate for placing the hub bearing, the transfer support is mounted in the detection box, passes through the through groove and is located in the placement cavity, two groups of second sliding rails are arranged on one side of the transfer support, two groups of second waterproof electric sliding blocks are arranged on one side of each of the two groups of second sliding rails, four groups of second waterproof electric sliding blocks are connected to the lifting frame, the fixing plate is rotatably arranged on one side of the lifting frame, a plurality of fixing holes are formed in one side of the fixing plate, and the hub bearing is connected to the plurality of fixing holes through a plurality of fixing screws.

5. A positioning method using the hub bearing sealability detection apparatus according to claim 1, characterized by, The method comprises the following steps: Based on the pressure sensor, the liquid injection pressure change rate is obtained, the shutdown protocol is triggered according to the liquid injection pressure change rate, and the leakage trigger flag is output; Based on the leakage trigger flag, the thermal imaging module is activated to obtain a plurality of original thermal imaging views, a pre-stored temperature-gray scale table is obtained, the plurality of original thermal imaging views are converted into a plurality of temperature field views according to the temperature-gray scale table, and the temperature field view is represented by temperature points; Based on the temperature sensor, the reference temperature data of the cooling liquid are obtained, and based on the plurality of temperature field views and the reference temperature data of the cooling liquid, a peak temperature rise view is obtained; Based on the peak temperature rise view, a thermal gradient vector field is constructed, and a divergence distribution map is generated based on the thermal gradient vector field and the peak temperature rise view; Based on the divergence distribution map, a plurality of temperature attenuation paths are obtained, the leakage source confidence of the plurality of temperature attenuation paths is verified to obtain a leakage point coordinate, and according to the leakage point coordinate and the projection view of the three-dimensional model of the hub bearing, a leakage position parameter of the hub bearing is obtained.

6. The positioning method of a hub bearing seal detection apparatus according to claim 5, wherein The method comprises the following steps: Based on the plurality of original thermal imaging views, pixel points in each original thermal imaging view are extracted, a pre-calibrated temperature-gray scale table is loaded to perform table lookup conversion on each pixel, each pixel point is converted into a temperature point according to the temperature-gray scale table, and a plurality of temperature field views are obtained.

7. The positioning method of a hub bearing seal detection apparatus according to claim 5, wherein The peak temperature rise view is constructed based on the peak temperature rise view, and the divergence distribution map is generated based on the thermal gradient vector field and the peak temperature rise view, including: Extracting each highest temperature difference point in the peak temperature rise view, obtaining the horizontal temperature change rate according to the horizontal temperature difference between each highest temperature difference point and the adjacent highest temperature difference point, and obtaining the vertical temperature change rate according to the vertical temperature difference between each highest temperature difference point and the adjacent highest temperature difference point; Each highest temperature difference point is generated according to the corresponding horizontal temperature change rate and vertical temperature change rate to generate a vector arrow, the direction of the vector arrow points to the direction of the fastest temperature rise, a plurality of vector arrows are combined into a vector arrow map, and the vector arrow map is a thermal gradient vector field; The thermal gradient vector field and the peak temperature rise view are superimposed to obtain the divergence value of each highest temperature difference point, and the divergence distribution map is generated according to the peak temperature rise view and the divergence value of each highest temperature difference point; 8. The positioning method of a hub bearing seal detection apparatus according to claim 7, wherein The divergence value is the pointing relationship of the vector arrow; The higher the divergence value is, the fewer the vector arrow points to; The lower the divergence value is, the more the vector arrow points to. The method further comprises: In the divergence distribution map, all highest temperature difference points with divergence values lower than the threshold value are screened, and these highest temperature difference points are constructed into a candidate point set; starting from each candidate point, the temperature difference between adjacent highest temperature difference points is tracked upward when the temperature difference is lower than the tracking threshold value, until the temperature drops to 10% of the highest temperature or reaches the surface of the cooling liquid, to generate a plurality of temperature attenuation paths; The leakage source confidence verification is performed on the plurality of temperature attenuation paths, a plurality of highest temperature difference points are randomly selected on the temperature attenuation path, the average offset angle of the plurality of highest temperature difference points corresponding to the temperature attenuation path is calculated, the vertical characteristic verification is performed, the candidate point is selected as the leakage point coordinate if it passes the verification, and the candidate point is judged as an interference signal if it fails the verification. ​ 9. The positioning method of a hub bearing seal detection apparatus according to claim 8, wherein ​ ​ ​

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