An electric vehicle tire dynamic balance detection device

Abstract

The application discloses a kind of electric vehicle tire dynamic balance detection device, it is related to tire dynamic balance detection technical field, including wheel dynamic balancing machine;The present application is cooperated with wheel dynamic balancing machine and mounting assembly by marking assembly, after inspection stops, wheel dynamic balancing machine is automatically driven hub slowly rotates according to detection result, until the position that needs to be corrected is opposite marking field mirror, then automatically marks and makes mark, omit staff to find the work of correction point, improve work efficiency and correction accuracy;The image of tire after marking is screened by position determination module, and the optimal image is selected as analysis image;By tire profile comparison, tire placement position anomaly can be found in time and warning is issued, to avoid misjudgment caused by installation deviation;After marking is completed, the marked profile and marking position are coincidently positioned and compared and checked in combination with historical data, if the position deviates, automatically trigger alarm and reposition marking, form closed-loop correction mechanism.

Description

Technical Field

[0001] This invention relates to the field of tire dynamic balance testing technology, and more particularly to a device for testing the dynamic balance of electric vehicle tires. Background Technology

[0002] Tire dynamic balancing is a crucial part of vehicle maintenance. Its main purpose is to eliminate the unbalanced forces generated when the wheels rotate at high speeds, thereby ensuring driving safety and comfort. Dynamic balancing is usually performed in professional repair shops, mainly relying on a wheel dynamic balancing machine. Its main working process includes installation and measurement, rotation testing, data reading and calibration, and re-inspection and verification.

[0003] The data reading and calibration process is as follows: After the test stops, the machine will display the results, usually indicating how many grams of counterweight lead blocks need to be added to the inner and outer sides of the rim. The technician will then install the corresponding weight of counterweight blocks at the designated locations according to the prompts. There are two types of counterweight installation: hammer-in (hammered into the groove on the edge of the rim) and adhesive (attached to the smooth inner wall of the rim). Adhesive installation is often used to protect high-end rims. Since the existing testing devices mainly interpret the location where the counterweight blocks need to be installed through the display screen, the staff needs to install the counterweight blocks in the correct location based on the screen data and their work experience. This method has low accuracy and relies heavily on the staff's work experience.

[0004] Therefore, the present invention improves the existing equipment to address the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a dynamic balance testing device for electric vehicle tires.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an electric vehicle tire dynamic balancing testing device, comprising a wheel dynamic balancing machine horizontally mounted and fixed on the ground, a central shaft connecting flange being bolted to the upper power rotation end of the wheel dynamic balancing machine, a rotating shaft being coaxially fixed to the central shaft connecting flange, an installation assembly for clamping and fixing the wheel hub being mounted and fixed on the rotating shaft, and a marking assembly for precise positioning being mounted and fixed to the upper side of the wheel dynamic balancing machine at the same horizontal plane as the rotating shaft via a support connecting flange;

[0007] The wheel dynamic balancing machine is equipped with a balance monitoring module and a position determination module.

[0008] The balance monitoring module calculates the unbalanced mass by combining the centrifugal force formula with the vibration relationship of the machine body; it further introduces axial distance and rim width to distinguish the unbalanced torque on the inner and outer sides, and uses the phase angle to determine the angle of the unbalanced position.

[0009] The position determination module performs grayscale processing and segmentation on the marked tire image. It uses the mean and standard deviation to filter and remove outliers from the grayscale block data, identifies blocks with abnormal grayscale values ​​in the image, and selects the image with the fewest abnormal blocks as the analysis image. It determines the tire outline by the tire's grayscale range and compares it with the preset size. If the deviation exceeds the threshold, a position anomaly warning is triggered. After marking is completed, the marking outline is drawn according to the preset marking grayscale range. The real-time marking position is compared and verified by combining the overlap between the marking outline and the marking position in historical data. If the position is consistent, the marking is determined to be accurate; if it deviates, an alarm is triggered and the marking is repositioned.

[0010] Preferably, the data analysis steps of the balance monitoring module are as follows:

[0011] M1: Collects the unbalanced centrifugal force generated when the wheel rotates at high speed using a force sensor. Simultaneously, vibration acceleration of the machine body is collected through vibration sensors. And obtain the total mass of the wheel hub and tire. nominal radius of wheel rim Wheel rotational angular velocity According to the centrifugal force formula Relationship with body vibration By combining the equations, the unbalanced mass can be calculated. ; settings for each sensor Outliers are removed from the data collected by each probe, and the mean value is calculated as the valid data for the corresponding time.

[0012] M2: The axial distance from the location of the unbalanced mass to the reference plane of the dynamic balancing machine. Obtain the inner axial distance respectively and outer axial distance And in combination with rim width satisfy Calculate the unbalanced torque on the inner side. and external unbalanced torque To distinguish between the unbalanced masses on the inner and outer sides; simultaneously, the phase angle of the unbalanced signal acquired by the sensor. Phase angle with wheel rotation reference Calculate the phase angle The angle of the unbalanced position is determined, and the wheel hub is driven to rotate to that angle to complete the automatic marking.

[0013] Preferably, the data analysis steps of the location determination module are as follows:

[0014] N1: A visual verification camera acquires real-time images of the marked tires, performs grayscale processing, and divides the images into grayscale blocks according to pixel size. These grayscale blocks are then numbered according to row and column numbers. For grayscale blocks acquired at the same time with the same number... Calculate the mean and standard deviation of each grayscale value, set a fluctuation range, and mark outliers that exceed the range. If the number of outliers... If the data is deemed abnormal, it is re-detected; otherwise, the outlier is removed, and the mean is calculated as the grayscale value of the grayscale block. After all grayscale blocks have been detected, the number of abnormal grayscale blocks is recorded. ,Pick The smallest image is used as the analysis image;

[0015] N2: On the analyzed image, determine the tire outline according to the preset tire grayscale range and compare it with the preset tire size. If the deviation exceeds the threshold, trigger the position abnormality warning. After the marking is completed, draw the marking outline according to the preset marking grayscale range. Combine the overlap positioning of the marking outline and the marking position in the historical data to compare and verify the position of the real-time marking position within the marking outline. If the position is consistent, the marking is determined to be accurate. If it deviates, trigger the alarm and drive the wheel hub to reposition and mark again.

[0016] Preferably, the mounting assembly includes a limiting spline fixed to the front end of the outer side of the rotating shaft, and a clamp is sleeved and connected to the outer side of the limiting spline segment on the rotating shaft, the clamp abutting and fixed to the middle of the inner side of the wheel hub.

[0017] Preferably, a connecting plate is coaxially abutted against the outer side of the wheel hub, and multiple countersunk holes are equidistantly opened around the connecting plate. Clamping bolts are inserted into the countersunk holes, and the clamping bolts pass through the wheel hub and are screwed into the threaded holes corresponding to those opened on the clamping plate.

[0018] Preferably, the front end of the limiting spline section on the rotating shaft passes through the hub and is inserted into the mating hole opened inside the connecting plate. A central shaft connecting bolt is inserted in the middle of the front end face of the connecting plate, and the rear end of the central shaft connecting bolt is screwed into the threaded hole opened in the front end face of the rotating shaft.

[0019] Preferably, the front end of the limiting spline section on the rotating shaft passes through the hub and is inserted into the mating hole opened inside the connecting plate. A central shaft connecting bolt is inserted in the middle of the front end face of the connecting plate, and the rear end of the central shaft connecting bolt is screwed into the threaded hole opened in the front end face of the rotating shaft.

[0020] Preferably, an equipment line extends from the rear end of the marking galvanometer, and the equipment line is connected to the power supply system and the laser marking system inside the wheel dynamic balancing machine through an extension tube.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. By using the marking component in conjunction with the wheel dynamic balancing machine and the installation component, after the inspection stops, the wheel dynamic balancing machine automatically drives the wheel hub to rotate slowly based on the test results until the position to be corrected is aligned with the marking field mirror. Then, it automatically marks the position, thus eliminating the need for workers to find the correction point, improving work efficiency and correction accuracy, and enabling the device to quickly correct the position. This solves the problems of low correction accuracy and heavy reliance on the personal experience of workers in existing testing devices.

[0023] 2. Based on Newton's law of centrifugal force, the balance monitoring module combines the unbalanced centrifugal force collected by the force sensor with the vibration acceleration of the machine body collected by the vibration sensor for joint calculation. Combined with parameters such as the total mass of the hub, the rim radius, and the rotational speed, the unbalanced mass is accurately derived. By introducing axial distance and rim width, the unbalanced torque on the inner and outer sides is effectively distinguished, and the angle of the unbalanced position is accurately determined by phase angle calculation. The dynamic balancing machine automatically drives the hub to the position requiring correction based on the calculation results, completing automatic marking. This significantly improves the automation and accuracy of detection and correction, reducing reliance on manual experience.

[0024] 3. The position determination module performs grayscale processing, segmentation, and outlier filtering on the marked tire images, selecting the optimal image for analysis to ensure the reliability of the image data. Through tire contour comparison, abnormal tire placement can be detected in a timely manner and an alert can be issued to avoid misjudgments caused by installation deviations. After marking is completed, the marking contour and marking position are aligned and compared with historical data. If the position deviates, an alarm is automatically triggered and the marking is repositioned, forming a closed-loop correction mechanism. This further ensures the accuracy of the marking position and improves the reliability and consistency of the overall detection. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0026] Figure 1 This is a three-dimensional schematic diagram of the overall appearance of the device proposed in this invention;

[0027] Figure 2 This is a three-dimensional schematic diagram of the device installation layout proposed in this invention;

[0028] Figure 3 This is an exploded three-dimensional schematic diagram of the installation component proposed in this invention;

[0029] Figure 4 This is a cross-sectional schematic diagram of the installation component structure proposed in this invention;

[0030] Figure 5This is a cross-sectional view of the layout of the marking component proposed in this invention;

[0031] Figure 6 This is a three-dimensional schematic diagram of the marking component proposed in this invention;

[0032] Figure 7 This is a flowchart of the system proposed in this invention.

[0033] The numbers in the diagram are: 1. Wheel dynamic balancing machine; 2. Central shaft connecting flange; 3. Rotary shaft; 4. Limiting spline; 5. Clamping plate; 6. Connecting plate; 7. Clamping bolt; 8. Central shaft connecting bolt; 9. Support connecting flange; 10. Marking galvanometer; 11. Marking field mirror; 12. Equipment line. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0035] Example 1: See Figures 1 to 6 The present invention discloses an electric vehicle tire dynamic balancing testing device, comprising a wheel dynamic balancing machine 1 horizontally mounted and fixed on the ground. A central shaft connecting flange 2 is bolted to the upper power rotating end of the wheel dynamic balancing machine 1. A rotating shaft 3 is coaxially fixed to the central shaft connecting flange 2. An installation assembly for clamping and fixing the wheel hub is mounted and fixed on the rotating shaft 3. A marking assembly for precise positioning is mounted and fixed to the upper side of the wheel dynamic balancing machine 1 at the same horizontal plane as the rotating shaft 3 via a support connecting flange 9. The installation assembly includes a limiting spline fixed to the front end of the outer side of the rotating shaft 3. 4. A clamp 5 is sleeved and connected to the outer side of the limiting spline 4 section on the rotating shaft 3. The clamp 5 is abutted and fixed to the middle of the inner side of the wheel hub. The mounting assembly includes a limiting spline 4 fixed to the front end of the outer side of the rotating shaft 3. A clamp 5 is sleeved and connected to the outer side of the limiting spline 4 section on the rotating shaft 3. The clamp 5 is abutted and fixed to the middle of the inner side of the wheel hub. The front end of the limiting spline 4 section on the rotating shaft 3 passes through the wheel hub and is inserted into the mating hole opened inside the connecting plate 6. A central shaft connecting bolt 8 is inserted into the middle of the front end face of the connecting plate 6. The rear end of the central shaft connecting bolt 8 is screwed into the threaded hole opened on the front end face of the rotating shaft 3.

[0036] In this invention, to address the problems of low correction accuracy and heavy reliance on the personal experience of operators in existing devices, the following technical solution is adopted: The marking component includes an extension tube coaxially fixed to the front end of the supporting connecting flange 9. A marking galvanometer 10 is installed and fixed at the front end of the extension tube, and a marking field mirror 11 is fixed to the outer side of the marking galvanometer 10, with the marking field mirror 11 facing the inner side of the wheel hub. An equipment line 12 extends from the rear end of the marking galvanometer 10. The equipment line 12 is connected to the power supply system and laser marking system inside the wheel dynamic balancing machine 1 through the extension tube. Through the cooperation of the marking component with the wheel dynamic balancing machine 1 and the mounting component, after the inspection stops, the wheel dynamic balancing machine 1 automatically drives the wheel hub to rotate slowly based on the detection results until the position to be corrected is directly aligned with the marking field mirror 11. Then, the marking is automatically applied to make the mark. This directly eliminates the need for operators to find the correction point, improving work efficiency and correction accuracy.

[0037] Working principle: When using this invention, first power is supplied to all electrical equipment. Then, the staff needs to carry out installation and measurement work. First, remove the tires from the car and observe and determine the wheel hub model during the tire removal process. This is to prepare for the subsequent use of the clamp 5 and connecting plate 6 that match the wheel hub. Then, place the tire vertically and find the matching clamp 5 and connecting plate 6. Then, first, put the connecting plate 6 against the middle of the front end face of the wheel hub to ensure that the holes are aligned. Then, insert the clamping bolts 7 one by one into the countersunk holes on the connecting plate 6 with one hand. Then, put the clamp 5 against the middle of the rear end face of the wheel hub with one hand to ensure that the holes are aligned. Then, rotate the clamping bolts 7 to screw them into the clamp 5 until they are finally clamped and fixed on the wheel hub.

[0038] Next, lift the tire and place it on the rotating shaft 3, paying attention to aligning the limiting spline 4, until the rotating shaft 3 is fully inserted into the connecting plate 6. Finally, insert the central shaft connecting bolt 8 into the front face of the connecting plate 6 and rotate it until it is screwed into the rotating shaft 3 for secure connection, thus completing the installation. Then, use calipers and other tools to measure three key data: the distance between the rim and the balancing machine, the width of the rim, and the diameter of the rim, and input these parameters into the machine to complete the measurement. Then, start the machine, and the wheel will rotate at high speed. The sensors inside the dynamic balancing machine will accurately measure the imbalance generated by the wheel during rotation, that is, which position is heavier and by how much. After the inspection stops, the wheel dynamic balancing machine 1 will automatically drive the hub to rotate slowly based on the detection results until the position that needs to be corrected is aligned with the marking field mirror 11, and then automatically mark it. This eliminates the need for workers to find the correction point, improving work efficiency and correction accuracy. Finally, the counterweight is properly installed, and the wheel is put back on the machine for re-inspection.

[0039] Example 2: See Figure 7 The wheel dynamic balancing machine 1 is equipped with a balance monitoring module and a position determination module.

[0040] The balance monitoring module calculates the unbalanced mass by combining the centrifugal force formula with the vibration relationship of the machine body; it further introduces the axial distance and rim width to distinguish the unbalanced torque on the inner and outer sides, and uses the phase angle to determine the angle of the unbalanced position; the dynamic balancing machine automatically drives the hub to rotate to this angle according to the calculation results, so that the marking field mirror is directly facing the position to be corrected, and completes the automatic marking.

[0041] The position determination module performs grayscale processing and segmentation on the marked tire image. It uses the mean and standard deviation to filter and remove outliers from the grayscale block data, identifying blocks with abnormal grayscale values ​​and selecting the image with the fewest outliers for analysis. The module determines the tire outline based on its grayscale range and compares it with preset dimensions. If the deviation exceeds a threshold, a position anomaly warning is triggered. After marking, the module traces the mark outline based on the preset grayscale range and compares the real-time marking position with historical data showing the overlap between the mark outline and the marking position. If the position matches, the marking is considered accurate; if it deviates, an alarm is triggered and the marking is repositioned.

[0042] Unbalanced centrifugal force when a wheel rotates at high speed The core dynamic data is directly acquired by the force sensor (directly acquired by the force sensor), and this force is caused by the unbalanced mass of the wheel hub. The force generated by the circular motion of the wheel follows Newton's law of centrifugal force; the basic derivation formula for centrifugal force is: ,in The nominal radius of the wheel rim. The angular velocity of the wheel rotation;

[0043] Each sensor is equipped with Multiple probes can acquire data simultaneously. Each corresponding data point is used to sort the collected data by collection time, and then further sort the corresponding items collected at the same time. averaging the data and standard deviation The calculation, and the mean obtained from the calculation. and standard deviation Collect data fluctuation range for corresponding items The system is configured to compare the collected data for a given item with its fluctuation range, mark data outside the fluctuation range as outliers, and record the number of outliers. ,like If the collected data is abnormal, the data will be re-tested; if If outliers are removed, the mean of the remaining corresponding test data after outlier removal is calculated. The calculation, and the mean obtained from the calculation. As the corresponding data detected at the corresponding time;

[0044] In dynamic balancing testing, the rim radius is commonly used. Unbalanced mass is commonly used Rotation speed is commonly used (Revolutions per minute), unit conversion is required (1 1000 1 1000 , , (for rotational speed)

[0045] When the wheel rotates, the unbalanced centrifugal force is transmitted to the dynamic balancing machine body, causing vibration acceleration of the machine body. (Vibration sensor data collection), both satisfy: ,in Let the total mass of the wheel hub and tire be denoted as ; substituting this into the core formula, we obtain . ;

[0046] To determine the axial distribution of the unbalanced mass in the wheel hub and distinguish between "inner counterweight" and "outer counterweight", the axial distance from the location of the unbalanced mass to the reference plane of the dynamic balancing machine is introduced. The distance between the wheel rim and the balancing machine is given by the formula: Unbalanced torque on the inner side External unbalanced torque ,in and The unbalanced masses are the inner and outer sides, respectively. and These are the axial distances from the inner and outer sides to the reference plane, respectively; and they satisfy... , This refers to the width of the wheel rim.

[0047] Phase angle at unbalanced position ,in The phase angle of the unbalanced signal acquired by the sensor. This is the reference phase angle for wheel rotation; the dynamic balancing machine drives the wheel hub to rotate to... When the angle is right, the marking field lens 11 is aligned with the position, and automatic marking is completed.

[0048] A visual verification camera for marking results is added at the marking location; the image data acquired by the camera in real time is processed into grayscale, and the grayscale image is segmented according to the size of the pixel blocks. The segmented grayscale blocks are then numbered according to their row and column numbers in the grayscale image; the acquired image data is sorted according to the acquisition time, and the corresponding numbered grayscale blocks in a single image acquired at the same time are... Each grayscale value is analyzed for outliers using its mean and standard deviation, and the number of outliers is recorded. ;

[0049] like If the grayscale data is abnormal, the grayscale data will be detected again. This is a preset proportional coefficient; if If outliers are removed, the remaining grayscale data after outlier removal is averaged. The calculation, and the mean obtained from the calculation. This serves as the grayscale value data detected at the corresponding time. If, upon re-detection, the grayscale value data is still deemed abnormal, then the corresponding numbered grayscale block is determined to be abnormal. After determining the grayscale values ​​of all numbered grayscale blocks on the grayscale image, the number of abnormal grayscale blocks is calculated. Record and take the quantity The image with the smallest grayscale value is the image to be analyzed;

[0050] The tire outline is determined on the analysis image according to a preset grayscale range. Then, the tire size is compared with the tire outline size in the analysis image (the tire outline size in the analysis image is calculated from the grayscale block size and the camera distance). If the difference between the two exceeds a preset threshold, the tire placement position is determined to be abnormal, a position abnormality signal is generated, and the position abnormality signal is transmitted to the control terminal inside the wheel dynamic balancing machine 1. The control terminal then controls the warning device to issue a warning. Otherwise, according to... and The data determines the location of the marking position on the tire, and the position is marked.

[0051] After the marking component completes automatic marking, it draws the marking outline within the tire contour according to the preset marking grayscale value range; it acquires historical data and compares the overlapping positions of the marking outline and the marking position in the historical data to determine the accurate overlapping position, and then positions the marking position on the marking outline (based on the distance of the marking position from the length and width directions within the marking outline); it acquires positioning data to compare the real-time marking position with the positioning data obtained from the historical data. If the real-time marking position within the marking outline is consistent with the positioning data obtained from the historical data, the marking position is determined to be accurate; otherwise, the marking position is determined to be off, an alarm is triggered, and the wheel hub is driven to reposition and perform the marking operation again.

[0052] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A dynamic balancing testing device for electric vehicle tires, comprising a wheel dynamic balancing machine (1) horizontally mounted and fixed on the ground, characterized in that: The upper side of the wheel dynamic balancing machine (1) is fixed with a central shaft connecting flange (2) by bolts. A rotating shaft (3) is coaxially fixed on the central shaft connecting flange (2). An installation component for clamping and fixing the wheel hub is installed on the rotating shaft (3). A marking component for precise positioning is installed and fixed on the upper side of the wheel dynamic balancing machine (1) at the same horizontal position as the rotating shaft (3) by a support connecting flange (9). The wheel dynamic balancing machine (1) is equipped with a balance monitoring module and a position determination module; The balance monitoring module calculates the unbalanced mass by combining the centrifugal force formula with the vibration relationship of the machine body; it further introduces axial distance and rim width to distinguish the unbalanced torque on the inner and outer sides, and uses the phase angle to determine the angle of the unbalanced position. The position determination module performs grayscale processing and segmentation on the marked tire image. It uses the mean and standard deviation to filter and remove outliers from the grayscale block data, identifies blocks with abnormal grayscale values ​​in the image, and selects the image with the fewest abnormal blocks as the analysis image. It determines the tire outline by the tire's grayscale range and compares it with the preset size. If the deviation exceeds the threshold, a position anomaly warning is triggered. After marking is completed, the marking outline is drawn according to the preset marking grayscale range. The real-time marking position is compared and verified by combining the overlap between the marking outline and the marking position in historical data. If the position is consistent, the marking is determined to be accurate; if it deviates, an alarm is triggered and the marking is repositioned.

2. The electric vehicle tire dynamic balancing testing device according to claim 1, characterized in that: The data analysis steps of the balance monitoring module are as follows: M1: Collects the unbalanced centrifugal force generated when the wheel rotates at high speed using a force sensor. Simultaneously, vibration acceleration of the machine body is collected through vibration sensors. And obtain the total mass of the wheel hub and tire. nominal radius of wheel rim Wheel rotational angular velocity According to the centrifugal force formula Relationship with body vibration By combining the equations, the unbalanced mass can be calculated. ; settings for each sensor Outliers are removed from the data collected by each probe, and the mean value is calculated as the valid data for the corresponding time. M2: The axial distance from the location of the unbalanced mass to the reference plane of the dynamic balancing machine. Obtain the inner axial distance respectively and outer axial distance And in combination with rim width satisfy Calculate the unbalanced torque on the inner side. and external unbalanced torque To distinguish between the unbalanced masses on the inner and outer sides; simultaneously, the phase angle of the unbalanced signal acquired by the sensor. Phase angle with wheel rotation reference Calculate the phase angle The angle of the unbalanced position is determined, and the wheel hub is driven to rotate to that angle to complete the automatic marking.

3. The electric vehicle tire dynamic balancing testing device according to claim 1, characterized in that: The data analysis steps for the location determination module are as follows: N1: The camera obtains the tire image after marking in real time through visual verification of the marking results, performs grayscale processing on the image and divides it into grayscale blocks according to the pixel block size, and numbers the grayscale blocks according to the number of rows and columns. For grayscale blocks with the same number collected at the same time Calculate the mean and standard deviation of each grayscale value, set a fluctuation range, and mark outliers that exceed the range. If the number of outliers... If the data is deemed abnormal, it is re-detected; otherwise, the outlier is removed, and the mean is calculated as the grayscale value of the grayscale block. After all grayscale blocks have been detected, the number of abnormal grayscale blocks is recorded. ,Pick The smallest image is used as the analysis image; N2: On the analyzed image, determine the tire outline according to the preset tire grayscale range and compare it with the preset tire size. If the deviation exceeds the threshold, trigger the position abnormality warning. After the marking is completed, draw the marking outline according to the preset marking grayscale range. Combine the overlap positioning of the marking outline and the marking position in the historical data to compare and verify the position of the real-time marking position within the marking outline. If the position is consistent, the marking is determined to be accurate. If it deviates, trigger the alarm and drive the wheel hub to reposition and mark again.

4. The electric vehicle tire dynamic balancing testing device according to claim 1, characterized in that: The mounting assembly includes a limiting spline (4) fixed to the front end of the outer side of the rotating shaft (3). A clamp (5) is sleeved and connected to the outer side of the limiting spline (4) segment on the rotating shaft (3). The clamp (5) abuts and is fixed to the middle of the inner side of the wheel hub.

5. The electric vehicle tire dynamic balancing testing device according to claim 4, characterized in that: A connecting plate (6) is coaxially abutted on the outer side of the wheel hub. Multiple countersunk holes are equidistantly provided around the connecting plate (6). Clamping bolts (7) are inserted into the countersunk holes. The clamping bolts (7) pass through the wheel hub and are screwed and fixed in the threaded holes corresponding to those provided on the clamping plate (5).

6. The electric vehicle tire dynamic balancing testing device according to claim 4, characterized in that: The front end of the limiting spline (4) section on the rotating shaft (3) passes through the hub and is inserted into the mating hole opened inside the connecting plate (6). The central shaft connecting bolt (8) is inserted in the middle of the front end face of the connecting plate (6), and the rear end of the central shaft connecting bolt (8) is screwed into the threaded hole opened on the front end face of the rotating shaft (3).

7. The electric vehicle tire dynamic balancing testing device according to claim 1, characterized in that: The marking assembly includes an extension tube coaxially fixed to the front end face of the support connecting flange (9), a marking galvanometer (10) is fixedly installed at the front end of the extension tube, a marking field mirror (11) is fixedly connected to the outer side of the marking galvanometer (10), and the marking field mirror (11) faces the inner side of the wheel hub.

8. The electric vehicle tire dynamic balancing testing device according to claim 7, characterized in that: The marking galvanometer (10) extends to the rear end of the equipment line (12), which is connected to the power supply system and laser marking system inside the wheel dynamic balancing machine (1) through an extension tube.

Images