Method and device for measuring wear coefficient of roller, electronic equipment and storage medium

Abstract

The invention provides a method and a device for measuring a wear coefficient of a roller, electronic equipment and a storage medium, and relates to the technical field of rail transit. A to-be-tested roller and a worn roller are driven to slide relatively; determining the sliding distance of the to-be-tested roller based on the relative sliding rate of the to-be-tested roller relative to the worn roller, the radius of the to-be-tested roller, the number of rotation turns of the to-be-tested roller and the rotation speed of the to-be-tested roller; obtaining the loss weight of the roller to be tested in the wear experiment; and acquiring the vertical force on the contact surface of the worn roller and the to-be-tested roller in the wear experiment and the hardness of the to-be-tested roller so as to acquire the wear coefficient of the to-be-tested roller. According to the invention, the actual wear environment of the roller to be tested on the track is simulated, and the measurement accuracy and authenticity of the wear coefficient of the roller of the track are improved. According to the invention, the actual sliding distance of the to-be-tested roller on the track is accurately calculated, and the measurement accuracy and authenticity of the wear coefficient of the roller of the track are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rail transit, and in particular to a method and device for measuring the wear coefficient of a rolling wheel, an electronic device and a storage medium. BACKGROUND

[0002] With the further improvement of the running speed of high-speed trains and the diversification and complexity of the application environment, the wheel-rail wear problem is more prominent. The wheel-rail wear coefficient is one of the important parameters that must be used when studying and predicting wheel wear, and is a basic parameter for analyzing various types of wheel-rail wear such as wheel tread wear, wheel rim wear, and wheel polygonal wear.

[0003] At present, China still uses the European wear coefficient diagram for wear prediction, but existing research has shown that the European wear coefficient diagram is not suitable for direct analysis of China's wheel-rail wear.

[0004] In the existing measurement of the wear coefficient of the rolling wheel of the track, there are differences between the test materials and the domestic wheel-rail materials, and there are significant differences between the two cylindrical contacts and the actual wheel-rail contact, resulting in inaccurate measurement of the wear coefficient of the rolling wheel of the track. SUMMARY

[0005] The present application provides a method and device for measuring the wear coefficient of a rolling wheel, an electronic device and a storage medium to solve the problem of inaccurate measurement of the wear coefficient of the rolling wheel of the track in the prior art, and to improve the accuracy of the measurement of the wear coefficient of the rolling wheel of the track.

[0006] The present application provides a method for testing the wear coefficient of a rolling wheel, comprising: driving the relative sliding of a to-be-tested rolling wheel and a wear rolling wheel, the wear rolling wheel being used to wear the to-be-tested rolling wheel; determining the sliding distance of the to-be-tested rolling wheel based on the relative sliding speed of the to-be-tested rolling wheel relative to the wear rolling wheel, the radius of the to-be-tested rolling wheel, the number of revolutions of the to-be-tested rolling wheel, and the rotational speed of the to-be-tested rolling wheel; obtaining the loss weight of the to-be-tested rolling wheel in the wear test; obtaining the vertical force on the contact surface of the wear rolling wheel and the to-be-tested rolling wheel and the hardness of the to-be-tested rolling wheel in the wear test; and obtaining the wear coefficient of the to-be-tested rolling wheel based on the sliding distance, the loss weight, the vertical force, and the hardness of the to-be-tested rolling wheel.

[0007] According to the method for testing the wear coefficient of a rolling wheel provided by the present application, the relative sliding of the to-be-tested rolling wheel and the wear rolling wheel is driven, which comprises: driving the to-be-tested rolling wheel to rotate at a constant speed under a set load; based on the friction force between the to-be-tested rolling wheel and the wear rolling wheel, driving the wear rolling wheel to rotate so that the to-be-tested rolling wheel and the wear rolling wheel form relative sliding; in the process of relative sliding, adjusting the pressure applied to the wear rolling wheel to adjust the relative sliding speed; and the balance relationship between the pressure applied to the wear rolling wheel and the relative sliding speed is calculated according to the following formula: ; wherein, is the pressure applied on the wear roller, is the friction coefficient between the wear roller and the wear roller to be tested, is the friction coefficient between the wear roller brake module and the wear roller, is the radius of the wear roller to be tested, is the radius of the wear roller, is the angular velocity of the wear roller to be tested, is the relative sliding speed, is the set load of the wear roller to be tested.

[0008] According to the test method for the wear coefficient of the roller provided by the application, the calculation formula of the sliding distance is as follows: ; wherein, is the sliding distance, is the relative sliding speed, is the radius of the wear roller to be tested, is the angular velocity of the wear roller to be tested, is the number of rotations of the wear roller to be tested.

[0009] According to the test method for the wear coefficient of the roller provided by the application, the friction coefficient between the wear roller and the wear roller to be tested is obtained based on the following steps: collecting the vertical force, the longitudinal force and the transverse force on the contact surface of the wear roller and the wear roller to be tested; determining the friction coefficient between the wear roller and the wear roller to be tested based on the vertical force, the longitudinal force and the transverse force.

[0010] According to the test method for the wear coefficient of the roller provided by the application, the surface shape of the wear roller to be tested is consistent with the actual wheel tread shape, and after obtaining the wear coefficient of the wear roller to be tested, the method further comprises: measuring the change amount of the wheel profile of the wear roller to be tested before and after the wear experiment; based on the change amount and the wear coefficient, evaluating the wear resistance of the wear roller to be tested.

[0011] The application also provides a measuring device for the wear coefficient of a roller, comprising: a driving module for driving the relative sliding of a wear roller to be tested and a wear roller, the wear roller being used to wear the wear roller to be tested; a test module for determining the sliding distance of the wear roller to be tested based on the relative sliding speed of the wear roller to be tested relative to the wear roller, the radius of the wear roller to be tested, the number of rotations of the wear roller to be tested and the rotational speed of the wear roller to be tested; obtaining the loss weight of the wear roller to be tested in the wear experiment; obtaining the vertical force on the contact surface of the wear roller and the wear roller to be tested and the hardness of the wear roller to be tested in the wear experiment; a calculation module for obtaining the wear coefficient of the wear roller to be tested based on the sliding distance, the loss weight, the vertical force and the hardness of the wear roller to be tested.

[0012] The measuring device for the wear coefficient of a rolling wheel provided by the present application further comprises a lateral loading unit, a displacement sensor and a vertical loading unit: the lateral loading unit is used to move the rolling wheel to be tested laterally to change the contact area of the rolling wheel to be tested and the wear rolling wheel; the displacement sensor is used to measure the lateral displacement of the rolling wheel to be tested, and the contact area is calculated based on the lateral displacement to obtain the wear coefficient under different contact areas; and the vertical loading unit is used to apply a set load to the rolling wheel to be tested in the vertical direction to simulate the rotation of the rolling wheel to be tested under the set load.

[0013] The measuring device for the wear coefficient of a rolling wheel provided by the present application further comprises a lateral loading unit, a displacement sensor and a vertical loading unit: the lateral loading unit is used to move the rolling wheel to be tested laterally to change the contact area of the rolling wheel to be tested and the wear rolling wheel; the displacement sensor is used to measure the lateral displacement of the rolling wheel to be tested, and the contact area is calculated based on the lateral displacement to obtain the wear coefficient under different contact areas; and the vertical loading unit is used to apply a set load to the rolling wheel to be tested in the vertical direction to simulate the rotation of the rolling wheel to be tested under the set load.

[0014] The present application further provides an electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor implements the measuring method for the wear coefficient of a rolling wheel as described above when executing the computer program.

[0015] The present application further provides a non-transitory computer readable storage medium having a computer program stored thereon, and the computer program is executable on a processor to implement the measuring method for the wear coefficient of a rolling wheel as described above.

[0016] The application provides a wear coefficient measurement method and device of a roller, an electronic device and a storage medium, wherein the wear coefficient measurement method comprises the following steps: driving a to-be-tested roller and a wear roller to slide relative to each other, and the wear roller is used to wear the to-be-tested roller; determining a sliding distance of the to-be-tested roller based on a relative sliding speed of the to-be-tested roller relative to the wear roller, a radius of the to-be-tested roller, a number of rotation circles of the to-be-tested roller and a rotation speed of the to-be-tested roller; obtaining a loss weight of the to-be-tested roller in a wear experiment; obtaining a vertical force on a contact surface of the wear roller and the to-be-tested roller and a hardness of the to-be-tested roller in the wear experiment; and obtaining the wear coefficient of the to-be-tested roller based on the sliding distance, the loss weight, the vertical force and the hardness of the to-be-tested roller. The application simulates an actual wear environment of the to-be-tested roller on a track by relative sliding of the to-be-tested roller and the wear roller, and improves the measurement accuracy and authenticity of the wear coefficient of the roller of the track. The application calculates the sliding distance by the relative sliding speed, the radius of the to-be-tested roller, the number of rotation circles of the to-be-tested roller and the rotation speed of the to-be-tested roller, realizes accurate calculation of the actual sliding distance of the to-be-tested roller on the track, and improves the measurement accuracy and authenticity of the wear coefficient of the roller of the track. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0018] Figure 1 is one of the flowcharts of the test method of the wear coefficient of the roller provided by the application.

[0019] Figure 2 is a structural schematic diagram of the test device of the wear coefficient of the roller provided by the application.

[0020] Figure 3 is the second flowchart of the test method of the wear coefficient of the roller provided by the application.

[0021] Figure 4 (a) is a schematic diagram of the vertical force and the longitudinal force of the left wheel of the to-be-tested roller of the application.

[0022] Figure 4 (b) is a schematic diagram of the vertical force and the longitudinal force of the right wheel of the to-be-tested roller of the application.

[0023] Figure 5 is a schematic diagram of the relationship among the wear coefficient, the relative sliding speed and the contact stress provided by the application.

[0024] Figure 6is a structural schematic diagram of an electronic device provided by the present application.

[0025] Reference signs: 10: vertical loading unit; 20: lateral loading unit; 30: dynamic torque sensor; 40: roller to be tested; 50: wear roller; 60: roller braking unit; 70: three-way force sensor; 80: motor. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in conjunction with the drawings in the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0027] The test method, device and electronic equipment for the wear coefficient of a roller of the present application will be described below in conjunction with Figures 1-6

[0028] is one of flowcharts of the test method for the wear coefficient of a roller provided by the present application, as Figure 1 shown, the method comprises steps S100 to S500, and each step is specifically as follows. Figure 1

[0029] S100: driving the roller to be tested and the wear roller to slide relative to each other, and the wear roller is used to wear the roller to be tested.

[0030] The execution subject of the embodiment of the present application comprises a measuring device for the wear coefficient of a roller. The test method for the wear coefficient of a roller of the present application comprises test boundary condition measurement, wheel-rail relative sliding speed control and wear coefficient calculation.

[0031] Test boundary condition measurement. First, the roller to be tested is cleaned with acetone for more than 20 minutes, then cleaned with alcohol for more than 20 minutes, dried and placed (for reference, 2 hours), weighed and measured by an electronic balance (for example, the accuracy of the electronic balance is 1 mg), the weight is measured three times repeatedly to take an average value, and the mass of the roller to be tested before the test is recorded. The hardness is measured by a hardness tester, and the hardness is measured at four positions on the tread surface and the roller surface of the roller to be tested, and the hardness is measured five times at each position to take an average value, and the hardness of the four positions is averaged to record the hardness of the roller to be tested before the test, to ensure that the hardness of the roller to be tested conforms to the actual wheel-rail hardness. At the same time, the environmental temperature and humidity during the test are recorded by a temperature and humidity meter. The whole process is as Figure 3 shown. Before the test, the wheel profile of the roller to be tested also needs to be measured.

[0032] ​Wheel-rail relative sliding speed control. After the above preparation, the to-be-tested roller is installed on the test bench of the roller wear coefficient test device, and the test head is debugged. During the test, the rotation speed of the to-be-tested roller is kept constant (uniform rotation). The to-be-tested roller contacts the wear roller, drives the wear roller to rotate, and forms relative sliding with the to-be-tested roller, and wears the to-be-tested roller. First, pre-test is carried out, the stability of the test bench is observed (the initial condition is determined), and it is ensured that there is no abnormal change in the to-be-tested roller, and there is also no abnormal change in noise (for example, frequency and amplitude), wear debris, the surface of the to-be-tested roller and the surface of the wear roller. During the pre-test, the to-be-tested roller is removed and weighed every 10 minutes, and the wear of the to-be-tested roller is calculated, until the wear of the to-be-tested roller is stable, and the number of rotation of the to-be-tested roller is recorded.

[0033] The to-be-tested roller and the wear roller are kept rotating at a stable relative sliding speed.

[0034] S200: Based on the relative sliding speed of the to-be-tested roller relative to the wear roller, the radius of the to-be-tested roller, the number of rotation of the to-be-tested roller and the rotation speed of the to-be-tested roller, the sliding distance of the to-be-tested roller is determined.

[0035] The calculation formula of the sliding distance is as follows: ; Wherein, is the sliding distance, is the relative sliding speed, is the radius of the to-be-tested roller, is the angular velocity of the to-be-tested roller, is the number of rotation of the to-be-tested roller.

[0036] During the test, any abnormal behavior of the to-be-tested roller and the wear roller is observed. The relative sliding speed, the radius of the to-be-tested roller, the number of rotation of the to-be-tested roller and the rotation speed of the to-be-tested roller are recorded. When the number of rotation of the to-be-tested roller reaches the expected stable number of times (for example, 25000 times), the rotation of the to-be-tested roller and the wear roller is stopped.

[0037] According to the calculation formula of the sliding distance, based on the relative sliding speed of the to-be-tested roller relative to the wear roller, the radius of the to-be-tested roller, the number of rotation of the to-be-tested roller and the rotation speed of the to-be-tested roller, the sliding distance of the to-be-tested roller is calculated.

[0038] S300: Obtain the loss weight of the to-be-tested roller in the wear test.

[0039] The test roller is disassembled, and the cleaning, weighing, diameter measurement and hardness measurement of the test roller are repeated again to ensure that the lost weight (wear amount) of the test roller is more than ten times the accuracy of the balance, so as to reduce the measurement error, and the change of the wheel surface of the test roller before and after the test is tested.

[0040] S400: Obtain the vertical force on the contact surface between the worn roller and the test roller and the hardness of the test roller in the wear experiment.

[0041] The vertical force on the contact surface between the worn roller and the test roller is measured by a force sensor, and the hardness of the test roller obtained by the above measurement is obtained.

[0042] S500: Obtain the wear coefficient of the test roller based on the sliding distance, the lost weight, the vertical force and the hardness of the test roller.

[0043] The material volume of the wear of the test roller is proportional to the sliding distance and the vertical force, and inversely proportional to the hardness of the test roller. The calculation formula of the wear coefficient is as follows.

[0044] ; wherein, is the wear coefficient, is the material volume of the wear of the test roller, is the hardness of the test roller, is the vertical force, is the density of the test roller, is the lost weight of the test roller, is the sliding distance.

[0045] The hardness of the test roller includes the Brinell hardness measured by a hardness tester. As shown in Table 2, according to the conversion between the hardnesses, the Brinell hardness can be converted into the tensile strength (unit: MPa). The hardness of the test roller is obtained by the average value of the hardness of the test roller before the test and the hardness of the test roller after the test.

[0046] The present invention provides a method for testing the wear coefficient of rollers. This method involves driving a test roller and a wear roller to slide relative to each other, with the wear roller used to wear down the test roller. The sliding distance of the test roller is determined based on the relative sliding rate of the test roller relative to the wear roller, the radius of the test roller, the number of rotations of the test roller, and the rotational speed of the test roller. The weight loss of the test roller during the wear experiment is obtained. The vertical force on the contact surface between the wear roller and the test roller and the hardness of the test roller are also obtained during the wear experiment. Based on the sliding distance, weight loss, vertical force, and hardness of the test roller, the wear coefficient of the test roller is obtained. This invention simulates the actual wear environment of the test roller on a track by simulating the relative sliding of the test roller and the wear roller, thus improving the accuracy and realism of the measurement of the wear coefficient of the track rollers. This invention calculates the sliding distance by taking the relative sliding rate, the radius of the test roller, the number of rotations, and the rotational speed of the test roller. This enables accurate calculation of the actual sliding distance of the test roller on the track, improving the accuracy and authenticity of the measurement of the wear coefficient of the track rollers.

[0047] Based on the above embodiments, driving the test roller and the worn roller to slide relative to each other includes the following steps: Drive the roller under test to rotate at a constant speed under a set load; Based on the friction between the test roller and the worn roller, the worn roller is driven to rotate, so that the test roller and the worn roller can slide relative to each other. During the relative sliding process, the pressure applied to the wear roller is adjusted to regulate the relative sliding rate; The formula for calculating the balance between the pressure applied to the wear roller and the relative sliding speed is as follows: ; in, To apply pressure to the wear roller, The coefficient of friction between the test roller and the worn roller is given. The coefficient of friction between the wear roller braking module and the wear roller. Let the radius of the roller to be tested be 1. To the radius of the wear roller, The angular velocity of the roller to be tested. The relative sliding speed, Set the load for the roller to be tested.

[0048] Since the train's rolling wheel needs to bear gravity in the vertical direction during actual driving, a vertical loading unit is used to apply a set load to the rolling wheel to be tested in the vertical direction, so that the rolling wheel to be tested rotates under the set load to simulate the actual wear environment of the rolling wheel to be tested.

[0049] During the relative sliding, the relative sliding speed is adjusted by adjusting the pressure applied to the wear rolling wheel.

[0050] The present application adjusts the relative sliding speed by adjusting the pressure applied to the wear rolling wheel, simulates different wear environments of the rolling wheel to be tested on the track, and improves the authenticity and convenience of the rolling wheel wear coefficient test.

[0051] Based on the above embodiment, the friction coefficient between the rolling wheel to be tested and the wear rolling wheel is obtained based on the following steps: Collect the vertical force, longitudinal force and transverse force on the contact surface of the wear rolling wheel and the rolling wheel to be tested. Based on the vertical force, longitudinal force and transverse force, the friction coefficient between the rolling wheel to be tested and the wear rolling wheel is determined.

[0052] The three-way force sensor of the rolling wheel wear coefficient measuring device is used to collect the vertical force, longitudinal force and transverse force on the contact surface of the wear rolling wheel and the rolling wheel to be tested.

[0053] The friction coefficient between the rolling wheel to be tested and the wear rolling wheel is (longitudinal force + transverse force) / vertical force.

[0054] The present application realizes accurate calculation of the friction coefficient between the rolling wheel to be tested and the wear rolling wheel through the vertical force, longitudinal force and transverse force.

[0055] Based on the above embodiment, the surface shape of the rolling wheel to be tested is consistent with the actual wheel tread shape, and after obtaining the wear coefficient of the rolling wheel to be tested, the following steps are further included: Measure the change amount of the wheel profile of the rolling wheel to be tested before and after the wear test. Based on the change amount and the wear coefficient, the wear resistance of the rolling wheel to be tested is evaluated.

[0056] Before the wear test is performed, the wheel profile of the to-be-tested roller is measured. After the wear test is completed, the wheel profile of the to-be-tested roller is measured again. The measurement results of the wheel profile before and after the wear test are compared to obtain the change amount of the wheel profile of the to-be-tested roller before and after the wear test. Meanwhile, according to the change amount and the wear coefficient, the wear resistance of the to-be-tested roller is evaluated.

[0057] The present application simultaneously combines the change amount of the wheel profile of the to-be-tested roller before and after the wear test and the wear coefficient to evaluate the wear resistance of the to-be-tested roller, thereby improving the accuracy of the wear resistance of the to-be-tested roller. By ensuring that the surface shape of the to-be-tested roller is consistent with the actual wheel tread shape, the authenticity of the wear test of the to-be-tested roller is improved.

[0058] The wear coefficient measurement device of the roller provided by the present application is described below, and the wear coefficient measurement device of the roller described below can be mutually referred to the wear coefficient measurement method of the roller described above.

[0059] As shown in Figure 2 A wear coefficient measurement device of a roller includes a driving module, a testing module, and a calculation module.

[0060] The driving module is configured to drive the to-be-tested roller 40 and the wear roller 50 to slide relative to each other, and the wear roller is configured to wear the to-be-tested roller.

[0061] The testing module is configured to determine a sliding distance of the to-be-tested roller based on a relative sliding speed of the to-be-tested roller relative to the wear roller, a radius of the to-be-tested roller, a number of rotation circles of the to-be-tested roller, and a rotation speed of the to-be-tested roller; obtain a lost weight of the to-be-tested roller in the wear test; and obtain a vertical force on a contact surface between the wear roller and the to-be-tested roller and a hardness of the to-be-tested roller in the wear test.

[0062] The calculation module is configured to obtain a wear coefficient of the to-be-tested roller based on the sliding distance, the lost weight, the vertical force, and the hardness of the to-be-tested roller.

[0063] In one embodiment, the wear coefficient measurement device of the roller further includes a lateral loading unit 20, a displacement sensor, and a vertical loading unit 10.

[0064] The lateral loading unit 20 is configured to move the to-be-tested roller laterally to change a contact area between the to-be-tested roller and the wear roller.

[0065] The displacement sensor is configured to measure a lateral displacement amount of the to-be-tested roller, calculate the contact area based on the lateral displacement amount, and obtain the wear coefficient under different contact areas.

[0066] A vertical loading unit 10 is configured to apply a set load on the test roller in a vertical direction to simulate rotation of the test roller under the set load.

[0067] In one embodiment, the test module includes a three-way force sensor 70 and a dynamic torque sensor 30, and the drive module includes a motor 80 and a roller braking unit 60.

[0068] The three-way force sensor 70 is configured to measure the vertical force, longitudinal force and lateral force on the contact surface between the test roller and the worn roller.

[0069] The dynamic torque sensor 30 is configured to measure the rotation speed of the test roller and the rotation speed of the worn roller, and calculate the relative sliding speed based on the rotation speed of the test roller and the rotation speed of the worn roller.

[0070] The motor 80 is configured to drive the test roller to rotate at a constant speed.

[0071] The roller braking unit 60 is configured to adjust the pressure applied to the worn roller to adjust the relative sliding speed.

[0072] Further, the measuring device of the wear coefficient of the roller further includes an instrument (National Instruments, NI) data acquisition board card, a frequency converter and an upper computer.

[0073] As shown in Figure 2 the vertical loading unit applies a set load on the test roller in a vertical direction, and the motor drives the test roller to rotate at a constant speed under the set load. The test roller and the worn roller are in contact, and the worn roller is driven to rotate by the friction force on the contact surface between the test roller and the worn roller, thereby forming relative sliding between the test roller and the worn roller. The roller braking unit adjusts the pressure applied to the worn roller to adjust the relative sliding speed, so that the test roller and the worn roller slide relative to each other at different relative sliding speeds. The rotation speed of the test roller and the rotation speed of the worn roller are measured by the dynamic torque sensor, and the relative sliding speed is calculated based on the rotation speed of the test roller and the rotation speed of the worn roller. Simultaneous monitoring of the dynamic torque sensor and the roller braking unit can achieve adjustment and monitoring of the relative sliding speed.

[0074] The lateral loading unit changes the contact area between the test roller and the worn roller by moving the test roller laterally. The lateral displacement of the test roller is measured by the displacement sensor. The contact area is calculated based on the lateral displacement to obtain the wear coefficient under different contact areas.

[0075] The vertical force, longitudinal force and lateral force on the contact surface between the worn roller and the roller to be tested are measured by the three-way force sensor, and then the friction coefficient between the roller to be tested and the worn roller is calculated, so as to accurately control the relative sliding speed of the roller to be tested relative to the worn roller.

[0076] The test data of the wear coefficient of the roller is shown in Table 1.

[0077] Table 1

[0078] According to the calculation formula of the balance relationship between the pressure applied on the worn roller and the relative sliding speed, the test data in Table 1 and the calculation formula of the wear coefficient, the wear coefficient is calculated. The calculation result of the wear coefficient is shown in Table 2.

[0079] Table 2

[0080] The contact stress is calculated according to the contact area of the roller to be tested and the worn roller and the vertical force.

[0081] The wear depth is obtained according to the change amount of the wheel profile of the roller to be tested before and after the wear test.

[0082] The relationship among the wear coefficient, the relative sliding speed and the contact stress is shown in Table 3. Figure 5 The detected vertical force (the vertical force of the left wheel of the roller to be tested and the vertical force of the right wheel of the roller to be tested) and the longitudinal force are shown in Table 4. Figure 4

[0083] The test device for the wear coefficient of the roller provided by the application drives the relative sliding of the roller to be tested and the worn roller, and the worn roller is used to wear the roller to be tested. The sliding distance of the roller to be tested is determined based on the relative sliding speed of the roller to be tested relative to the worn roller, the radius of the roller to be tested, the rotation number of the roller to be tested and the rotation speed of the roller to be tested. The loss weight of the roller to be tested in the wear test is obtained. The vertical force on the contact surface between the worn roller and the roller to be tested and the hardness of the roller to be tested in the wear test are obtained. The wear coefficient of the roller to be tested is obtained based on the sliding distance, the loss weight, the vertical force and the hardness of the roller to be tested. The application simulates the actual wear environment of the roller to be tested on the track by the relative sliding of the roller to be tested and the worn roller, and improves the measurement accuracy and authenticity of the wear coefficient of the roller on the track. The application calculates the sliding distance based on the relative sliding speed, the radius of the roller to be tested, the rotation number and the rotation speed of the roller to be tested, and realizes the accurate calculation of the actual sliding distance of the roller to be tested on the track, and improves the measurement accuracy and authenticity of the wear coefficient of the roller on the track.

[0084] ​In one embodiment, the driving module is configured to drive the test roller to rotate at a constant speed under a set load, drive the wear roller to rotate based on the friction between the test roller and the wear roller to cause relative sliding between the test roller and the wear roller, adjust the pressure applied to the wear roller to adjust the relative sliding speed during the relative sliding, and calculate a balance relationship between the pressure applied to the wear roller and the relative sliding speed according to the following formula: ; wherein, P is the pressure applied to the wear roller, μ is the friction coefficient between the test roller and the wear roller, μ' is the friction coefficient between the wear roller and the wear roller brake module, R is the radius of the test roller, R' is the radius of the wear roller, ω is the angular speed of the test roller, v is the relative sliding speed, F is the set load of the test roller.

[0085] In one embodiment, the sliding distance is calculated according to the following formula: ; wherein, S is the sliding distance, v is the relative sliding speed, R is the radius of the test roller, ω is the angular speed of the test roller, N is the number of rotations of the test roller.

[0086] In one embodiment, the test module is further configured to collect the vertical force, the longitudinal force and the lateral force on the contact surface between the wear roller and the test roller, and the calculation module is further configured to determine the friction coefficient between the test roller and the wear roller based on the vertical force, the longitudinal force and the lateral force.

[0087] In one embodiment, the test module is further configured to measure the change in the wheel profile of the test roller before and after the wear test, and the calculation module is further configured to evaluate the wear resistance of the test roller based on the change and the wear coefficient.

[0088] Figure 6 An example of a schematic diagram of the physical structure of an electronic device is shown in FIG. 1. Figure 6As shown, the electronic device can include a processor 610, a communications interface 620, a memory 630, and a communications bus 640, wherein the processor 610, the communications interface 620, and the memory 630 complete mutual communication through the communications bus 640. The processor 610 can invoke a logical instruction in the memory 630 to execute a test method of a wear coefficient of a roller, which includes: driving a relative sliding of a to-be-tested roller and a wear roller, the wear roller being used to wear the to-be-tested roller; determining a sliding distance of the to-be-tested roller based on a relative sliding speed of the to-be-tested roller relative to the wear roller, a radius of the to-be-tested roller, a number of rotation turns of the to-be-tested roller, and a rotation speed of the to-be-tested roller; obtaining a loss weight of the to-be-tested roller in a wear experiment; obtaining a vertical force on a contact surface of the wear roller and the to-be-tested roller in the wear experiment and a hardness of the to-be-tested roller; and obtaining the wear coefficient of the to-be-tested roller based on the sliding distance, the loss weight, the vertical force, and the hardness of the to-be-tested roller.

[0089] In addition, the logical instruction in the memory 630 described above can be implemented in the form of a software functional unit and sold or used as an independent product, and can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various program code storage media.

[0090] In yet another aspect, the present application also provides a non-transitory computer readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the test method of a wear coefficient of a roller provided by the above-mentioned methods, which includes: driving a relative sliding of a to-be-tested roller and a wear roller, the wear roller being used to wear the to-be-tested roller; determining a sliding distance of the to-be-tested roller based on a relative sliding speed of the to-be-tested roller relative to the wear roller, a radius of the to-be-tested roller, a number of rotation turns of the to-be-tested roller, and a rotation speed of the to-be-tested roller; obtaining a loss weight of the to-be-tested roller in a wear experiment; obtaining a vertical force on a contact surface of the wear roller and the to-be-tested roller in the wear experiment and a hardness of the to-be-tested roller; and obtaining the wear coefficient of the to-be-tested roller based on the sliding distance, the loss weight, the vertical force, and the hardness of the to-be-tested roller.

[0091] The device embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed to multiple network units. Part or all of the modules can be selected to achieve the purposes of the embodiments according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0092] Through the description of the above embodiments, those skilled in the art can clearly understand that the embodiments can be realized by means of software plus the necessary general hardware platform, and of course can also be realized by hardware. Based on such understanding, the above technical solutions can be embodied in the form of software products, and the computer software products can be stored in a computer readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and include a plurality of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods described in each embodiment or some parts of the embodiments.

[0093] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to 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: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to 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.

Claims

1. A method of testing the wear coefficient of a roller, characterized in that, The method comprises the following steps: driving the relative sliding of the test roller and the wear roller, wherein the wear roller is used to wear the test roller; determining the sliding distance of the test roller based on the relative sliding speed of the test roller relative to the wear roller, the radius of the test roller, the number of revolutions of the test roller and the rotating speed of the test roller; obtaining the loss weight of the test roller in the wear experiment; obtaining the vertical force on the contact surface between the wear roller and the test roller and the hardness of the test roller in the wear experiment; obtaining the wear coefficient of the test roller based on the sliding distance, the loss weight, the vertical force and the hardness of the test roller.

2. The method of testing the wear coefficient of a roller as claimed in claim 1, wherein, The driving of the relative sliding of the test roller and the wear roller comprises the following steps: driving the test roller to rotate at a constant speed under a set load; driving the wear roller to rotate based on the friction force between the test roller and the wear roller, so that the test roller and the wear roller form the relative sliding; adjusting the pressure applied to the wear roller to adjust the relative sliding speed during the relative sliding; the balance relationship between the pressure applied to the wear roller and the relative sliding speed is calculated as follows: ； wherein is the pressure applied on the worn roller, is the friction coefficient between the roller to be tested and the worn roller, is the friction coefficient between the worn roller brake module and the worn roller, is the radius of the roller to be tested, is the radius of the worn roller, is the angular velocity of the roller to be tested, is the relative sliding speed, is the set load of the roller to be tested.

3. The method of claim 1, wherein the calculation formula of the sliding distance is as follows: ； wherein, is the sliding distance, is the relative sliding speed, is the radius of the roller to be tested, is the angular speed of the roller to be tested, is the number of turns of the roller to be tested.

4. The method of claim 2, wherein the friction coefficient between the test roller and the wear roller is obtained based on the following steps: collecting the vertical force, longitudinal force and transverse force on the contact surface between the wear roller and the test roller; determining the friction coefficient between the test roller and the wear roller based on the vertical force, the longitudinal force and the transverse force.

5. The method of claim 1, wherein The surface shape of the test roller is consistent with the actual wheel tread shape, and after obtaining the wear coefficient of the test roller, the method further comprises the following steps: measuring the change amount of the wheel profile of the test roller before and after the wear experiment; evaluating the wear resistance of the test roller based on the change amount and the wear coefficient.

6. A device for measuring the wear coefficient of a roller, characterized in that The method comprises the following steps: a driving module is used to drive the relative sliding of the test roller and the wear roller, wherein the wear roller is used to wear the test roller; a test module is used to determine the sliding distance of the test roller based on the relative sliding speed of the test roller relative to the wear roller, the radius of the test roller, the number of revolutions of the test roller and the rotating speed of the test roller; obtain the loss weight of the test roller in the wear experiment; obtain the vertical force on the contact surface between the wear roller and the test roller and the hardness of the test roller in the wear experiment; a calculation module is used to obtain the wear coefficient of the test roller based on the sliding distance, the loss weight, the vertical force and the hardness of the test roller.

7. The apparatus for measuring the wear coefficient of a roller according to claim 6, wherein It also comprises a transverse loading unit, a displacement sensor and a vertical loading unit: the transverse loading unit is used to move the test roller transversely to change the contact area between the test roller and the wear roller; the displacement sensor is used to measure the transverse displacement of the test roller, calculate the contact area based on the transverse displacement, and obtain the wear coefficient under different contact areas; The vertical loading unit is configured to apply a set load on the to-be-tested roller in a vertical direction to simulate rotation of the to-be-tested roller under the set load.

8. The apparatus for measuring the wear coefficient of a roller according to claim 6, wherein The test module comprises a three-way force sensor and a dynamic torque sensor, and the driving module comprises a motor and a roller braking unit. The three-way force sensor is configured to measure the vertical force, longitudinal force and lateral force on the contact surface between the worn roller and the to-be-tested roller. The dynamic torque sensor is configured to measure the rotation speed of the to-be-tested roller and the rotation speed of the worn roller, and calculate the relative sliding speed based on the rotation speed of the to-be-tested roller and the rotation speed of the worn roller. The motor is configured to drive the to-be-tested roller to rotate at a constant speed. The roller braking unit is configured to adjust the pressure applied on the worn roller to adjust the relative sliding speed.

9. An electronic device comprising a memory, a processor, and a computer program stored on the memory and running on the processor, characterized in that, The computer program, when executed by the processor, implements the method for measuring the wear coefficient of the roller according to any one of claims 1 to 5.

10. A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program, when executed by the processor, implements the method for measuring the wear coefficient of the roller according to any one of claims 1 to 5.

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