A method for testing the scratch resistance of a special vehicle tire

Abstract

The application relates to the technical field of vehicle tire testing, and discloses a special vehicle tire scratch resistance performance test method, which comprises the following steps: installing a tire to be tested, marking a cutting mark line, applying a radial load, adjusting the position of a cutter, cutting along the mark line, and recording a cutting force curve and a peak value. Through multi-direction and multi-point cutting design, the tire sidewall scratch resistance performance is fully characterized, and a scratch resistance index is introduced to quantify the performance of a protective tire. The application can effectively guide the performance verification and identification of the protective tire, provides technical support for the research and application of the special vehicle tire, and ensures the reliability and repeatability of the test results.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle tire testing, in particular to a special vehicle tire scratch resistance test method. BACKGROUND

[0002] At present, when special vehicles drive on complex road conditions, their tires often face the challenge of harsh environments such as sand, jungle or river beach. In order to meet the protection requirements, the protective tire increases the cutting-resistant fiber fabric on the sidewall to form a functional protective layer. The protective layer works together with the sidewall rubber to improve the sidewall scratch resistance. However, the evaluation method of the scratch resistance of the protective tire in the prior art is not perfect. Usually, a single direction cutting test is used for evaluation, which cannot fully reflect the multi-directional stress state of the tire in actual use. In addition, the existing test equipment often has difficulty in accurately controlling the radial loading load and inflation pressure parameters when simulating real working conditions, which affects the reliability and repeatability of the test results. It should be noted that the above introduction to the technical background is only to facilitate the clear and complete description of the technical scheme of the present application, and to facilitate the understanding of those skilled in the art. The above technical scheme cannot be considered as known to those skilled in the art only because it is described in the background section of the present application. SUMMARY

[0003] The present application provides a special vehicle tire scratch resistance test method and device.

[0004] To solve the above problems, the present application provides a technical scheme. A special vehicle tire scratch resistance test method, comprising: installing the tire to be tested on the test equipment and adjusting its inflation pressure to a specified value; eight equal divisions are taken on the circumference of the tire on both sides of the cross-sectional width, and the cutting mark line is marked along the radial, circumferential and 45° angle directions; the tire is subjected to radial load by a load loading device, and the rectangular cutter is adjusted to the highest position as the axial zero point by using the cutter lifting sliding guide; the cutter is moved to the position outside the shoulder along the cutting mark line, the depth of cut is set to 4.5±0.1 mm, and the cutter is ensured to cut the functional protective layer without touching the body steel cord; the cutter is started in the direction of the cutting mark line, the cutting speed is kept at 10±0.5 mm / s, and the cutting force curve and the cutting force peak value are recorded; after the cutting of all test points is completed, the tire inflation pressure change and the environmental temperature are checked and recorded.

[0005] As a preferred embodiment, the step of installing the tire to be tested on the test device specifically includes: fixing the support column on the base of the test device, and installing the load loading device on the top of the support column and driving it by the hydraulic system to apply radial load to the tire; the tire sliding platform is composed of linear guide rails, ball screws and stepping motors, and is used to carry the tire to be tested and realize forward and backward movement; the cutter transverse sliding guide rail and the cutter lifting sliding guide rail are respectively used to adjust the horizontal position and vertical height of the rectangular cutter; the cutter mounting bracket fixes the rectangular cutter and is provided with a mounting groove at the rear end to embed the pressure sensor; the pressure sensor collects the reaction force signals in the cutting process of the cutter in real time, and generates a cutting force curve graph through the data acquisition module and software program.

[0006] As a preferred embodiment, the step of eight-divisionally taking test points on the circumference where the width of the tire cross-section is located and marking the cutting identification lines along the radial, circumferential and 45° angle directions specifically includes: eight-divisionally determining the positions of the test points on the circumference where the width of the tire cross-section is located, and marking them as radial test points, circumferential test points and 45° angle direction test points; the radial test points include A11, A12, B11 and B12 positions, the circumferential test points include A21, A22, B21 and B22 positions, and the 45° angle direction test points include A31, A32, A33, A34, B31, B32, B33 and B34 positions; each test point needs to be matched with the cutting identification line.

[0007] As a preferred embodiment, the step of applying radial load to the tire by the load loading device and adjusting the rectangular cutter to the highest position as the axial zero point by the cutter lifting sliding guide rail specifically includes: according to theoretical analysis and test verification, setting the radial loading load of the tire as 65% of the maximum load capacity of the single tire, and the inflation pressure as 60% of the inflation pressure corresponding to the maximum load of the single tire, with a deviation of not more than 10 kPa; applying radial load by the load loading device composed of a hydraulic pump station and a hydraulic oil cylinder; adjusting the rectangular cutter to the highest position by the cutter lifting sliding guide rail, and defining it as the axial zero point.

[0008] As a preferred embodiment, the step of moving the cutter to a position outside the tire shoulder along the cutting identification line, setting the depth of cut to 4.5±0.1 mm, and ensuring that the cutter can cut to the functional protective layer without touching the carcass steel cord specifically includes: adjusting the position of the rectangular cutter by the cutter transverse sliding guide rail and the cutter lifting sliding guide rail, so that it moves to a position outside the tire shoulder along the cutting identification line; setting the thickness of the cutter to (4±0.1) mm, the blade angle to (30±1)°, and the depth of cut to 4.5±0.1 mm; accurately controlling the cutting depth by controlling the cutter lifting sliding guide rail, to ensure that the cutter can cut to the functional protective layer without touching the carcass steel cord.

[0009] As a preferred embodiment, the step of starting the cutter to cut in the direction of the cutting mark line, and keeping the cutting speed at 10±0.5 mm / s, while recording the cutting force curve and the cutting force peak value, specifically includes: starting the cutter to cut in the direction of the cutting mark line, and keeping the cutting speed at 10±0.5 mm / s; collecting the reaction force signal of the cutter during cutting in real time through the pressure sensor, and generating the cutting force curve through the data acquisition module and software program; recording the cutting force peak value and storing the related data.

[0010] As a preferred embodiment, after the cutting of all test points is completed, the tire inflation pressure change and the ambient temperature are checked and recorded, specifically including: after the cutting of all test points is completed, checking the tire inflation pressure change P1 and the ambient temperature T1; if the tire inflation pressure changes by more than 11% before and after the test or air leakage occurs, then re-sampling test; if the difference between the measured value and the arithmetic mean value in the same direction is more than 10%, then retest the similar position.

[0011] As a preferred embodiment, it further includes: calculating the arithmetic mean value of the cutting force peak value in the radial, circumferential and 45° angle directions, and further calculating the arithmetic mean value of the average cutting force in the three directions as the scratch resistance cutting force; defining the scratch resistance cutting force ratio as the ratio of the scratch resistance cutting force of the protective tire to the non-protective tire, which is used to quantify the scratch resistance performance of the protective tire.

[0012] The test method as described above, the tire to be tested is a protective tire or a non-protective tire.

[0013] A special vehicle tire scratch resistance performance test device, comprising: a support column fixed to the test equipment base; a load loading device installed at the top of the support column and driven by a hydraulic system to apply a radial load to the tire; a cutter horizontal sliding guide and a cutter lifting sliding guide for adjusting the horizontal position and vertical height of the rectangular cutter respectively; a cutter mounting bracket fixed to the rectangular cutter and provided with a mounting groove at the back to embed the pressure sensor; a tire sliding platform composed of a linear guide, a ball screw and a stepping motor and carrying the tire to be tested.

[0014] As a preferred embodiment, the thickness of the rectangular cutter is (4±0.1) mm, the cutter blade angle is (30±1)°, and the depth of cut is 4.5±0.1 mm.

[0015] As a preferred embodiment, the pressure sensor collects the reaction force signal of the cutter during cutting in real time, and generates the cutting force curve through the data acquisition module and software program.

[0016] As a preferred embodiment, the load loading device is composed of a hydraulic pump station and a hydraulic cylinder, and the hydraulic cylinder is pushed by oil pressure to apply radial load to the tire.

[0017] As a preferred embodiment, the tire sliding platform realizes the forward and backward movement of the tire through linear guide rails, ball screws and stepping motors, and assists in multi-directional cutting operation by manual overturning.

[0018] As a preferred embodiment, the cutter transverse sliding guide rail and the cutter lifting sliding guide rail are used to adjust the horizontal position and vertical height of the rectangular cutter respectively, so as to accurately control the cutting depth.

[0019] As a preferred embodiment, the test environment conditions should meet the requirements of temperature of 5-35℃, relative humidity of 20%-80%, and atmospheric pressure of normal pressure.

[0020] As a preferred embodiment, the replacement standard of the test cutter includes that the cutting frequency exceeds 150 times, the cutter is rusty or damaged, and the tire body steel wire cord is cut.

[0021] The special vehicle tire scratch resistance performance test method and device provided by the embodiment of the application comprehensively represent the scratch resistance performance of the tire side under different working conditions through the multi-directional and multi-point cutting design. The introduction of the scratch resistance index weakens the influence of individual differences on the results, and improves the operability of the evaluation method. The selection of the test parameters is based on simulation modeling analysis and actual test research, and comprehensively considers the related standard basis, tire use conditions and test operability, so as to ensure the reliability and repeatability of the test results. In summary, the test method provided by the application can effectively guide the performance verification and identification of the protective tire, and provides technical support for the research and application of the special vehicle tire. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the special vehicle tire scratch resistance performance test device in the embodiment of the application.

[0023] Figure 2 It is a schematic diagram of the scratch resistance test point and the cutting direction in the embodiment of the application.

[0024] Figure 3 It is a test operation flowchart in the embodiment of the application.

[0025] Figure 4 It is a working principle block diagram of the pressure sensor and the data acquisition module in the embodiment of the application.

[0026] Figure 5 It is a data inspection flowchart before and after the test in the embodiment of the application.

[0027] Wherein, 1, support column; 2, load loading device; 3, cutter mounting bracket; 4, tire sliding platform; 5, rectangular cutter; 6, pressure sensor; 7, cutter lifting sliding guide rail; 8, cutter transverse sliding guide rail; 9, data acquisition module; 10, hydraulic system. DETAILED DESCRIPTION

[0028] The technical solutions of the present application will be described clearly and completely below in combination with the drawings of the present application. Obviously, the described embodiments are only a part 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 skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] The present application provides a kind of special vehicle tire scratch resistance performance test method and its device, its specific implementation mode is as follows.Combination Figures 1 to 5 of the drawings and the component numbers marked in the drawings, the specific implementation process of the present application and the connection relationship, positional relationship and mutual cooperation relationship between components are described in detail.

[0030] First, the overall structure of the test device is as Figure 1 shown, including support column 1, load loading device 2, cutter mounting bracket 3, tire sliding platform 4, rectangular cutter 5, pressure sensor 6, cutter lifting sliding guide rail 7, cutter transverse sliding guide rail 8, data acquisition module 9 and hydraulic system 10. The support column 1 is fixed on the test equipment base, for supporting the whole test device and ensuring its stability. Load loading device 2 is installed at the top of support column 1 and driven by hydraulic system 10 to apply radial load to the tire. The hydraulic system 10 is composed of hydraulic pump station and hydraulic oil cylinder, and the oil pressure is used to drive the hydraulic oil cylinder to realize accurate control of load. Cutter mounting bracket 3 fixes rectangular cutter 5 and sets mounting groove at the back to embed pressure sensor 6, and pressure sensor 6 is used to collect the reaction force signal in real time during cutter cutting process. Cutter lifting sliding guide rail 7 and cutter transverse sliding guide rail 8 are used to adjust the vertical height and horizontal position of rectangular cutter 5 respectively, so as to accurately control the cutting depth and cutting direction. Tire sliding platform 4 is composed of linear guide rail, ball screw and stepping motor, which is used to carry the tire to be tested and realize forward and backward movement, and is assisted by manual overturning to complete multi-directional cutting operation.

[0031] In the actual test, first, the tire to be tested is installed on the tire sliding platform 4, and its inflation pressure is adjusted to the specified value by the inflation device. According to the theoretical analysis and test verification, the radial loading load of the tire is set to 65% of the maximum load capacity of the single tire, the inflation pressure is set to 60% of the inflation pressure corresponding to the maximum load of the single tire, and the deviation is not more than 10 kPa. Subsequently, the positions of the test points are determined on the circumference of the two side sections of the tire, and are labeled as radial test points, circumferential test points and 45° angle direction test points. The radial test points include A11, A12, B11 and B12 positions, the circumferential test points include A21, A22, B21 and B22 positions, and the 45° angle direction test points include A31, A32, A33, A34, B31, B32, B33 and B34 positions. Each test point needs to be matched with the cutting identification line, and the direction of the cutting identification line is radial, circumferential and 45° angle direction respectively.

[0032] After completing the marking of the test points, the hydraulic system 10 drives the load loading device 2 to apply a radial load to the tire. The cutter lifting sliding guide 7 adjusts the rectangular cutter 5 to the highest position, and defines it as the axial zero point. The thickness of the rectangular cutter 5 is (4±0.1) mm, the cutter blade angle is (30±1) °, and the feed depth is 4.5±0.1 mm. The cutter transverse sliding guide 8 and the cutter lifting sliding guide 7 work together to adjust the position of the rectangular cutter 5 so that it moves to a position outside the shoulder along the cutting identification line. The cutting depth is accurately controlled by controlling the cutter lifting sliding guide 7, so that the cutter can cut the functional protective layer without touching the carcass steel cord.

[0033] When the cutter is started to cut along the cutting identification line, the cutting speed is kept at 10±0.5 mm / s. The pressure sensor 6 collects the reaction force signal in real time during the cutting process of the cutter, and generates a cutting force curve graph through the data acquisition module 9 and the software program. The peak value of the cutting force is recorded and the related data is stored. After completing the cutting operation of all test points in turn, check the change of tire inflation pressure P1 and ambient temperature T1. If the tire inflation pressure changes more than 11% before and after the test, or if the tire leaks, the test is re-sampled. If the difference between the measured value and the arithmetic mean value in the same direction is more than 10%, the similar positions are retested.

[0034] The arithmetic mean of the peak cutting force in the radial, circumferential and 45° angle directions is calculated, and the arithmetic mean of the mean cutting force in the three directions is further calculated as the scratch-resistant cutting force. The scratch-resistant cutting force ratio is defined as the ratio of the scratch-resistant cutting forces of the protective tire and the non-protective tire, which is used to quantify the scratch-resistant performance of the protective tire. The test environmental conditions should meet the requirements of temperature of 5-35℃, relative humidity of 20-80%, and atmospheric pressure of normal pressure. The replacement criteria of the test cutter include cutting frequency exceeding 150 times, cutter rusting or damage, and cutting to the carcass steel cord.

[0035] In practical application scenarios, the test method is suitable for testing the scratch-resistant performance of protective tires and non-protective tires. For example, in the development process of a certain special vehicle tire, a new protective tire is tested for performance verification using the test method. The test results show that the arithmetic mean of the peak cutting force in the radial, circumferential and 45° angle directions is 120N, 110N and 115N respectively, and the comprehensive scratch-resistant cutting force is 115N. Compared with the non-protective tire, the scratch-resistant cutting force ratio is 1.3, indicating that the protective tire has significantly improved scratch-resistant performance. This result provides reliable technical support for the practical application of the tire.

[0036] The operation principle of the test device is to apply radial load to the tire through the hydraulic system 10 and the load loading device 2 to simulate the stress state under actual use conditions. The cutter lifting and sliding guide 7 and the cutter transverse sliding guide 8 work together to ensure that the rectangular cutter 5 can be accurately adjusted to the target position and achieve stable cutting. The pressure sensor 6 cooperates with the data acquisition module 9 to collect cutting force signals in real time and generate cutting force curve graphs, providing a basis for subsequent data analysis. The linear guide, ball screw and stepping motor design of the tire sliding platform 4 ensures the smooth movement of the tire during the test, supplemented by manual overturning to complete multi-directional cutting operations. The entire test process is strictly carried out according to the preset parameters to ensure the reliability and repeatability of the test results.

[0037] The design of the test device fully considers the convenience of actual operation and the accuracy of test results. For example, the structure of the cutter lifting and sliding guide 7 and the cutter transverse sliding guide 8 realizes precise adjustment of the cutter position through precise mechanical transmission. The working principle of the pressure sensor 6 and the data acquisition module 9 is shown in Figure 4 , the signal acquisition and curve generation process is clear and clear. The operation process of tire inflation pressure change detection and environmental temperature recording is shown in Figure 5 , the steps of data inspection before and after the test are standardized and rigorous. These design details together constitute a complete test system, providing comprehensive technical support for the scratch-resistant performance test of special vehicle tires.

[0038] The selection of the test method is based on simulation modeling analysis and actual test research, and comprehensively considers relevant standard basis, tire use conditions and test operability. By setting a cutting design of multiple directions and multiple points, the tire sidewall's scratch resistance in different conditions is fully represented. The introduction of the scratch resistance index weakens the influence of individual differences on the results, and improves the operability of the evaluation method. This test method not only can effectively guide the performance verification and identification of protective tires, but also provides technical support for the research and application of special vehicle tires.

[0039] In order to better enable relevant persons in the art to fully understand and implement the present application, the specific implementation principles of the present application are further supplemented below in combination with a specific application scenario.

[0040] In actual operation, first, the tire to be tested is installed on the tire sliding platform 4, and the inflation pressure is adjusted to the specified value by the inflation device. Then, the technician determines the positions of the test points on the circumference of the tire two-side section width according to the test point distribution shown in the drawing. These test points correspond to the radial, circumferential and 45° angle directions respectively, ensuring that the key areas of the tire sidewall that may be scratched are covered. Each test point needs to be matched with the cutting identification line to ensure accurate positioning of the subsequent cutting operation. Figure 2

[0041] After completing the test point marking, the hydraulic system 10 drives the load loading device 2 to apply a radial load to the tire. At this time, the hydraulic pump station transmits the oil pressure to the hydraulic oil cylinder, pushing the load loading device 2 to move downward, thereby simulating the stress state of the tire in actual use. The knife lifting sliding guide 7 adjusts the rectangular knife 5 to the highest position and defines it as the axial zero point. This operation is achieved through the precise screw rod transmission mechanism inside the guide, ensuring the accuracy of the initial height of the knife position.

[0042] Next, the knife transverse sliding guide 8 and the knife lifting sliding guide 7 work together to adjust the rectangular knife 5 to the target test point position. The knife transverse sliding guide 8 drives the ball screw to rotate through the stepping motor, smoothly moving the knife in the horizontal direction; the knife lifting sliding guide 7 controls the vertical height of the knife through a similar mechanism, ensuring that the depth of cut is accurately controlled within the range of 4.5±0.1 mm. The structural design of the knife lifting sliding guide 7 and the knife transverse sliding guide 8 ensures high precision of the knife position adjustment.

[0043] When the knife is started to cut along the cutting identification line, the cutting speed is maintained at 10±0.5 mm / s. In this process, the pressure sensor 6 is embedded in the installation slot of the knife mounting bracket 3, which real-time collects the reaction force signals received by the knife during cutting. These signals are transmitted to the computer software program through the data acquisition module 9, generating a cutting force curve graph. The drawing shows the cutting force curve of the test tire. Figure 4 ​The working principle of the pressure sensor 6 and the data acquisition module 9 is shown, and the signal acquisition and curve generation process is clear. The technician records the cutting force peak value by observing the curve and stores the related data.

[0044] After completing the cutting operation of all test points in turn, the technician checks the tire inflation pressure change P1 and the ambient temperature T1. If the tire inflation pressure changes more than 11% before and after the test or air leakage occurs, the test is re-sampled. In addition, if the difference between the measured value of a test point and the arithmetic mean value in the same direction exceeds 10%, the nearby position is retested. The operation process is shown in the attached Figure 5 The data checking steps before and after the test are shown in the attached

[0045] In the data analysis stage, the technician calculates the arithmetic mean value of the cutting force peak value in the radial, circumferential and 45° angle directions, and further calculates the arithmetic mean value of the cutting force average in the three directions as the cut resistance. By comparing the cut resistance ratio of the protective tire and the non-protective tire, the improvement range of the cut resistance performance of the protective tire is quantified. For example, in the development process of a certain special vehicle tire, the performance of a new protective tire is verified by using the test method. The test results show that the arithmetic mean value of the cutting force peak value of the tire in the radial, circumferential and 45° angle directions is 120N, 110N and 115N respectively, and the comprehensive cut resistance is 115N. Compared with the non-protective tire, the cut resistance ratio is 1.3, indicating that the protective tire has significant improvement in cut resistance performance.

[0046] The entire test process is strictly carried out according to the preset parameters to ensure the reliability and repeatability of the test results. The test environment conditions meet the requirements of temperature 5℃-35℃, relative humidity 20%-80%, and atmospheric pressure normal pressure. The replacement standard of the test cutter includes cutting frequency exceeding 150 times, cutter rust or damage, and cutting to the carcass steel cord. These design details together constitute a complete test system, which provides comprehensive technical support for the cut resistance performance test of special vehicle tires.

[0047] In summary, by combining the operation steps and operation principles of the above specific application scenarios, the present application realizes the comprehensive evaluation of the cut resistance performance of special vehicle tires. The design of the test device fully considers the convenience of actual operation and the accuracy of test results, ensuring the scientificity and practicality of the test method.

[0048] Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for testing the scratch resistance of a special vehicle tire, characterized in that, The method comprises the following steps: installing the tire to be tested on a test device and adjusting the inflation pressure to a specified value; eight equidistant test points are taken on the circumference where the cross-sectional width of the tire is located, and cutting mark lines are marked in the radial, circumferential and 45° angle directions; a radial load is applied to the tire by a load loading device, and a rectangular cutter is adjusted to the highest position as the axial zero point by a cutter lifting sliding guide; the cutter is moved to a position outside the shoulder along the cutting mark line, the depth of cut is set to 4.5±0.1 mm, and it is ensured that the cutter can cut to the functional protective layer without touching the body steel wire cord; the cutter is started to cut in the direction of the cutting mark line, the cutting speed is kept at 10±0.5 mm / s, and the cutting force curve and the cutting force peak value are recorded at the same time; after cutting all the test points in turn, the change of tire inflation pressure and the ambient temperature are checked and recorded.

2. The method of claim 1, wherein the tire is a tire for a special vehicle. The installation of the tire to be tested on the test device specifically comprises: the column is fixed on the base of the test device, and the load loading device is installed at the top of the column and driven by a hydraulic system to apply a radial load to the tire; the tire sliding platform is composed of a linear guide rail, a ball screw and a stepping motor, which is used to carry the tire to be tested and realize forward and backward movement; the cutter transverse sliding guide and the cutter lifting sliding guide are used to adjust the horizontal position and vertical height of the rectangular cutter respectively; the cutter mounting bracket fixes the rectangular cutter and sets an installation groove at the back to embed the pressure sensor; the pressure sensor collects the reaction force signals in real time during the cutting process of the cutter, and generates the cutting force curve through the data acquisition module and software program.

3. The method of claim 1, wherein the tire is a tire for a special vehicle. The eight equidistant test points are taken on the circumference where the cross-sectional width of the tire is located, and cutting mark lines are marked in the radial, circumferential and 45° angle directions specifically comprising: the positions of the eight equidistant test points are determined on the circumference where the cross-sectional width of the tire is located, and are marked as radial test points, circumferential test points and 45° angle direction test points; the radial test points include A11, A12, B11 and B12 positions, the circumferential test points include A21, A22, B21 and B22 positions, and the 45° angle direction test points include A31, A32, A33, A34, B31, B32, B33 and B34 positions; each test point needs to match the cutting mark line.

4. The method of claim 1, wherein the tire is a tire for a special vehicle. The radial load is applied to the tire by the load loading device, and the rectangular cutter is adjusted to the highest position as the axial zero point by the cutter lifting sliding guide specifically comprising: according to theoretical analysis and test verification, the radial loading load of the tire is set to 65% of the maximum load capacity of a single tire, the inflation pressure is set to 60% of the inflation pressure corresponding to the maximum load of a single tire, and the deviation is not more than 10 kPa; the radial load is applied by the load loading device composed of a hydraulic pump station and a hydraulic oil cylinder; the cutter lifting sliding guide adjusts the rectangular cutter to the highest position, and defines it as the axial zero point.

5. The method of claim 1, wherein the tire is a tire for a special vehicle. The cutter is moved to a position outside the shoulder along the cutting mark line, the depth of cut is set to 4.5±0.1 mm, and it is ensured that the cutter can cut to the functional protective layer without touching the body steel wire cord specifically comprising: Adjusting the position of the rectangular cutter by the cutter transverse sliding guide and the cutter lifting sliding guide to move to the position outside the shoulder along the cutting mark line; The thickness of the cutter is set to 4±0.1 mm, the cutter blade angle is set to 30±1°, and the depth of cut is set to 4.5±0.1 mm. The cutting depth is accurately controlled by controlling the cutter lifting sliding guide to ensure that the cutter can cut the functional protective layer without touching the carcass steel cord.

6. The method of claim 1, wherein the tire is a special vehicle tire. Start the cutter cutting in the direction of the cutting mark line, and keep the cutting speed at 10±0.5 mm / s, and record the cutting force curve and the cutting force peak value, which specifically includes: Start the cutter cutting in the direction of the cutting mark line, and keep the cutting speed at 10±0.5 mm / s; Real-time acquisition of the reaction force signal of the cutter during cutting by the pressure sensor, and generation of the cutting force curve by the data acquisition module and software program; Record the cutting force peak value and store the related data.

7. The method of claim 1, wherein the tire is a special vehicle tire. After cutting all the test points in turn, check and record the change of the tire inflation pressure and the ambient temperature, which specifically includes: After cutting all the test points in turn, check the change of the tire inflation pressure P1 and the ambient temperature T1; If the change of the tire inflation pressure before and after the test exceeds 11% or air leakage occurs, then re-sample and test; If the difference between the measured value and the arithmetic mean value in the same direction exceeds 10%, then retest the similar position.

8. The method of claim 1, wherein the tire is a special vehicle tire. Further including the following steps: Calculate the arithmetic mean value of the cutting force peak value in the radial, circumferential and 45° angle directions, and further calculate the arithmetic mean value of the average cutting force in the three directions as the scratch resistance cutting force; Define the scratch resistance cutting force ratio as the ratio of the scratch resistance cutting force of the protective tire to the non-protective tire.

9. A device for testing the scratch resistance of a special vehicle tire, characterized in that Including: A support fixed to the base of the test equipment; A load loading device installed at the top of the support and driven by a hydraulic system to apply a radial load to the tire; A cutter transverse sliding guide and a cutter lifting sliding guide for adjusting the horizontal position and vertical height of the rectangular cutter, respectively; A cutter mounting bracket for fixing the rectangular cutter and providing a mounting groove at the back to embed the pressure sensor; A tire sliding platform composed of a linear guide, a ball screw and a stepping motor and carrying the tire to be tested.

10. The device for testing the scratch resistance of a special vehicle tire according to claim 9, characterized in that, The thickness of the rectangular cutter is 4±0.1 mm, the cutter blade angle is 30±1°, and the depth of cut is 4.5±0.1 mm.

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