Fatigue test device for monofilament cord thread for electric automobile tire

Abstract

The invention relates to the technical field of fatigue detection, in particular to a monofilament cord thread fatigue test device for an electric automobile tire. Comprising a workbench provided with a support, and the support is provided with a fixing frame; the n-shaped frame is fixedly connected to the workbench, the n-shaped frame is provided with a first sliding frame in a sliding mode, the n-shaped frame is provided with a first power piece, the first power piece is used for driving the first sliding frame to move, and the first sliding frame is provided with a rotating frame; the rotating sleeve is rotationally arranged on the rotating frame; the second sliding frame is slidably arranged on the rotating sleeve in a limiting manner; the clamping mechanism is arranged on the fixing frame; and the adjusting mechanism is arranged on the rotating sleeve. According to the invention, the clamped to-be-tested steel wire is twisted by rotating the rotating frame, and the stress state of the steel wire in the actual use process is simulated, so that the test of the steel wire in the real environment is completed.

Description

Technical Field

[0001] The present invention relates to the technical field of fatigue detection, and particularly relates to a fatigue test device for single-filament cord of electric vehicle tires. Background Art

[0002] The steel cord in a tire is an important component for strengthening the tire structure and improving its durability. To ensure the structural integrity and performance stability of the steel wire under long-term use conditions, fatigue detection is essential. However, in the existing process of fatigue detection of tire steel cord, usually, after fixing both ends of the steel wire, multiple fatigue tests such as stretching and bending are directly carried out. Although this test method can evaluate the basic mechanical properties of the steel wire, in actual use, the steel wire is usually coiled inside the tire, and when a single loop of the steel wire is coiled, its head and tail ends will undergo a certain torsion in the circumferential direction, making the whole steel wire in a torsional state. Therefore, the existing test method cannot fully simulate the stress state of the steel wire in the actual use process, especially ignoring the influence of torsional stress, resulting in the test results not being able to accurately reflect the strength and durability of the steel wire in the real environment. Summary of the Invention

[0003] In order to overcome the above-mentioned technical problems, the present invention provides a fatigue test device for single-filament cord of electric vehicle tires.

[0004] The technical solution of the present invention is: a fatigue test device for single-filament cord of electric vehicle tires, including: A workbench, on which a bracket is installed, and the bracket is provided with a fixing frame; An n-shaped frame, fixedly connected to the workbench, a first sliding frame is slidably arranged on the n-shaped frame, a first power member is installed on the n-shaped frame, the first power member is used to drive the first sliding frame to move, and a rotating frame is arranged on the first sliding frame; A rotating sleeve, rotatably arranged on the rotating frame; A second sliding frame, limit-slidably arranged on the rotating sleeve, and a tension spring is installed between the rotating sleeve and the second sliding frame; A clamping mechanism, arranged on the fixing frame, and the clamping mechanism is used to clamp both ends of the object to be tested; An adjusting mechanism, arranged on the rotating sleeve, and the adjusting mechanism is used to control the rotation of the second sliding frame to twist the clamped object to be tested, so as to facilitate a comprehensive simulation test of the object to be tested.

[0005] Preferably, the clamping mechanism includes: Two electric push rods, respectively fixedly connected to the fixing frame and the second sliding frame; The fixed plates, there are two of them, are respectively fixedly connected to the telescopic ends of the adjacent electric push rods. Two symmetrically distributed third sliding frames are slidably arranged on both the fixed frame and the second sliding frame. The third sliding frame is provided with a convex column, and the fixed plate is provided with two symmetrically distributed inclined slots. The convex column of the third sliding frame slides in the adjacent inclined slots on the adjacent fixed plate.

[0006] Preferably, the third sliding frame is provided with a limiting slot for restricting the position of the object to be measured.

[0007] Preferably, a sliding block is slidably arranged on the third sliding frame. A spring is installed between the sliding block and the adjacent third sliding frame, and the sliding block is provided with an elastic pad.

[0008] Preferably, the adjusting mechanism includes: A worm gear fixedly connected to the rotating sleeve; A worm is rotatably arranged on the rotating frame and meshes with the worm gear; A motor is fixedly connected to the rotating frame, and the output shaft of the motor is fixedly connected to the worm.

[0009] Preferably, it further includes: A stretching mechanism is arranged on the workbench. The stretching mechanism is used for performing segmented stretching tests on the object to be measured. The stretching mechanism includes: A second power member is fixedly connected to the workbench. A first sliding plate and a second sliding plate are slidably arranged on the n-shaped frame. The second power member is used to drive the first sliding plate to move, and a spring is installed between the first sliding plate and the second sliding plate; A third power member is fixedly connected to the second sliding plate. The third power member is provided with a first limiting frame. The third power member is used to drive the first limiting frame to move. A sliding rod is slidably arranged on the first limiting frame. The sliding rod is fixedly connected to a second limiting frame. Rotating wheels are rotatably arranged on both the first limiting frame and the second limiting frame. A first threaded rod is rotatably arranged on the second limiting frame, and the first threaded rod is threadedly connected to the first limiting frame; A limiting component is arranged on the second limiting frame for restricting the rotation of the adjacent rotating wheels.

[0010] Preferably, the bracket is rotatably connected to the fixed frame, and the first sliding frame is rotatably connected to the rotating frame.

[0011] Preferably, the rotating wheel is provided with circumferentially distributed rubber strips for increasing the friction between it and the object to be measured.

[0012] Preferably, the limiting component includes: A limiting post, the second limiting frame is provided with a sliding cavity, the limiting post is slidably arranged in the sliding cavity of the second limiting frame, and the rotating wheel on the second limiting frame is provided with a limiting hole in contact with the limiting post; A third sliding plate, slidably arranged in the sliding cavity of the second limiting frame, and a spring is installed between the third sliding plate and the limiting post.

[0013] Preferably, the second limiting frame is threadedly connected with a second threaded rod, and the second threaded rod is in contact with the third sliding plate.

[0014] The beneficial effects of the present invention are as follows: The present invention twists the clamped wire to be tested by rotating the rotating frame to simulate the stress state of the wire during actual use, so as to complete the test of the wire in a real environment; The wire is wound around the fixed frame and the second sliding frame, and the centering clamping of two adjacent third sliding frames is combined to improve the fixing stability of the wire to be tested, thereby indirectly improving the accuracy and stability of the test results; The deformation of the elastic pad on the sliding block is used to facilitate the stable clamping of the device for objects to be tested with different specifications, improving the applicability of the device; The work of the motor is used to apply different degrees of torsional force to the wire to be tested, improving the diversity of the test results of the device; The limiting of the rotating wheel by the limiting post, combined with the continuous upward movement of the first limiting frame and the second limiting frame, quickly completes the segmented multiple tensile fatigue test of the wire to be tested by the device, improving the test efficiency and comprehensiveness of the test structure of the device; The rotation of the second threaded rod is used to adjust the elastic force of the spring connected to the limiting post, facilitating the application of different tensile forces to the wire to be tested by the device and improving the diversity of the test results of the device. Description of the Drawings

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 It is a three-dimensional structural schematic diagram of the second power member and the first sliding plate of the present invention; Figure 3 It is a cross-sectional view of the first sliding frame and the rotating frame of the present invention; Figure 4 It is a three-dimensional structural schematic diagram of the electric push rod and the fixed plate of the present invention; Figure 5 It is a cross-sectional view of the rotating sleeve and the second sliding frame of the present invention; Figure 6 It is an exploded view of the third sliding frame and the sliding block of the present invention; Figure 7 It is a cross-sectional view of the first limiting frame and the second limiting frame of the present invention; Figure 8 It is a cross-sectional view of the second limiting frame and the rotating wheel of the present invention.

[0016] Reference numerals in the drawings: 1, workbench; 11, support; 12, fixing frame; 13, n-shaped frame; 14, first sliding frame; 141, first power member; 15, rotating frame; 16, rotating sleeve; 17, second sliding frame; 2, electric push rod; 21, fixing plate; 22, third sliding frame; 221, limiting groove; 23, sliding block; 3, worm gear; 31, worm; 32, motor; 4, second power member; 41, first sliding plate; 42, second sliding plate; 43, third power member; 44, first limiting frame; 45, sliding rod; 46, second limiting frame; 461, runner; 47, first threaded rod; 5, limiting column; 51, third sliding plate; 6, second threaded rod. Detailed implementation manners

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0018] Embodiment 1: A single-filament cord fatigue test device for an electric vehicle tire, as Figures 1 - 5 shown, includes: a workbench 1, on which a support 11 is installed, and the support 11 is provided with a fixing frame 12; an n-shaped frame 13, fixedly connected to the workbench 1, the n-shaped frame 13 is slidably provided with a first sliding frame 14, the n-shaped frame 13 is provided with a first power member 141, the first power member 141 is used to drive the first sliding frame 14 to move, and the first sliding frame 14 is provided with a rotating frame 15; a rotating sleeve 16, rotatably arranged on the rotating frame 15; a second sliding frame 17, limit-slidably arranged on the rotating sleeve 16; a tension spring is installed between the rotating sleeve 16 and the second sliding frame 17; a clamping mechanism, the clamping mechanism is arranged on the fixing frame 12, and the clamping mechanism is used to clamp both ends of the object to be tested; an adjusting mechanism, arranged on the rotating sleeve 16, and the adjusting mechanism is used to control the rotation of the second sliding frame 17 to twist the clamped object to be tested, so as to facilitate a comprehensive simulation test of the object to be tested.

[0019] In the above solution, a control panel is arranged on the front side of the workbench 1, and the control panel is electrically connected to all the electrical components in the present invention. The fixing frame 12 and the second sliding frame 17 are both provided with n-shaped fixing parts. The n-shaped fixing parts of the fixing frame 12 and the second sliding frame 17 are both used to wind the steel wire thereon to complete the fixation of the steel wire. The second sliding frame 17 is located directly above the fixing frame 12. The tension spring between the rotating sleeve 16 and the second sliding frame 17 is used to slowly apply a tensile force to the object to be tested. The first power member 141 is a hydraulic push rod, and the telescopic change of the telescopic end of the first power member 141 is controlled by an existing hydraulic system. The telescopic end of the first power member 141 is fixedly connected to the first sliding frame 14.

[0020] Specific working principle: The operator winds the two ends of the steel wire to be tested around the n-shaped fixing part of the fixing frame 12 and the n-shaped fixing part of the second sliding frame 17 respectively. Then, the operator starts the clamping mechanism through the control panel. The clamping mechanism works to clamp and fix the steel wire to be tested. After the steel wire to be tested is fixed, the operator controls the telescopic end of the first power member 141 to reciprocate through the control panel. The telescopic end of the first power member 141 drives the first sliding frame 14, the rotating frame 15, the rotating sleeve 16 and the second sliding frame 17 to reciprocate. The second sliding frame 17 moves to reciprocally stretch the steel wire fixed between it and the fixing frame 12, realizing the tensile fatigue test of the steel wire to be tested by this device. During the test, the operator controls the hydraulic system through the control panel to control the pressure of the liquid injected into the first power member 141, so as to control the maximum tensile force applied to the steel wire and complete the tensile fatigue test of the steel wire to different degrees.

[0021] During the test, the operator controls the adjustment mechanism to work through the control panel. The adjustment mechanism works to control the rotation of the rotating sleeve 16. The rotating sleeve 16 drives the second sliding frame 17 to rotate. The second sliding frame 17 rotates to twist the fixed steel wire. Subsequently, the operator controls the telescopic end of the first power member 141 to reciprocate through the control panel, completing the tensile fatigue test of the steel wire in the twisted state, simulating the stress state of the steel wire during actual use, and thus completing the test of the steel wire in a real environment and improving the accuracy of the test results.

[0022] As Figure 1 、 Figure 4 and Figure 6 shown, the clamping mechanism includes: electric push rods 2, with two of them, respectively fixedly connected to the fixing frame 12 and the second sliding frame 17; fixing plates 21, with two of them, respectively fixedly connected to the telescopic ends of adjacent electric push rods 2. Two symmetrically distributed third sliding frames 22 are slidably arranged on both the fixing frame 12 and the second sliding frame 17. The third sliding frame 22 is provided with a convex column, and the fixing plate 21 is provided with two symmetrically distributed inclined slots. The convex column of the third sliding frame 22 is slidably located in the adjacent inclined slots on the adjacent fixing plate 21. The third sliding frame 22 is provided with a limiting slot 221 for restricting the position of the object to be tested. A sliding block 23 is slidably arranged on the third sliding frame 22. A spring is installed between the sliding block 23 and the adjacent third sliding frame 22. The sliding block 23 is provided with an elastic pad.

[0023] In the above solution, the two fixing plates 21 gradually approach each other from the adjacent two inclined grooves in the direction from the opposite side to the back side. The two elastic pads are located on the opposite sides of the two sliding blocks 23. The elastic pads on the sliding blocks 23 are made of rubber material, which facilitates the clamping and fixing of steel wires with different diameters by the device and improves the applicability of the device. The elastic pads on the sliding blocks 23 are provided with uniformly distributed protrusions, and the protrusions on the two adjacent sliding blocks 23 in the front and back are staggered to increase the friction force with the diameter of the steel wire to be measured.

[0024] Working principle: The operator starts the two electric push rods 2 through the control panel. The telescopic ends of the two electric push rods 2 contract to drive the two fixing plates 21 away from each other. The movement of the fixing plates 21 causes the inclined grooves on them to squeeze the convex columns of the adjacent third sliding frames 22, so that the two adjacent third sliding frames 22 in the front and back are separated from each other. At the same time, the two adjacent sliding blocks 23 in the front and back are separated from each other. Subsequently, the operator passes the steel wire through the n-shaped fixing part of the fixing frame 12 and the n-shaped fixing part of the second sliding frame 17. Then the operator bends the two ends of the steel wire so that the ends of the steel wire are located between the two sliding blocks 23 again. At this time, the two ends of the steel wire are in a U shape. Subsequently, the operator starts the two electric push rods 2 through the control panel, and the telescopic ends of the two electric push rods 2 move in the reverse direction to reset. Among them, the two adjacent third sliding frames 22 in the front and back are attached to each other, so that the steel wire passes through the limiting groove 221. After the two adjacent third sliding frames 22 in the front and back are attached to each other, the two adjacent sliding blocks 23 under the elastic force of the adjacent springs squeeze the folded steel wire to complete the stable clamping of the steel wire, prevent the steel wire from slipping off, and indirectly improve the accuracy of the test results.

[0025] As Figure 1 and Figure 5 shown, the adjusting mechanism includes: a worm gear 3 fixedly connected to the rotating sleeve 16; a worm 31 rotatably arranged on the rotating frame 15 and meshing with the worm gear 3; a motor 32 fixedly connected to the rotating frame 15, and the output shaft of the motor 32 is fixedly connected to the worm 31.

[0026] Working principle: During the process of adjusting the torsion angle of the steel wire, the operator starts the motor 32 to work through the control panel. The output shaft of the motor 32 rotates by a specified angle. The output shaft of the motor 32 drives the worm 31 to rotate. The rotation of the worm 31 drives the rotating sleeve 16 and the second sliding frame 17 to rotate by a specified angle through the worm gear 3, so that the steel wire between the second sliding frame 17 and the fixing frame 12 is twisted by a specified angle.

[0027] Embodiment 2: On the basis of Embodiment 1, as Figure 2 and Figure 7As shown in the figure, it further includes a stretching mechanism disposed on the workbench 1. The stretching mechanism is used for performing segmented stretching tests on the object to be tested. The stretching mechanism includes: a second power member 4 fixedly connected to the workbench 1. A first sliding plate 41 and a second sliding plate 42 are slidably disposed on the n-shaped frame 13. The second power member 4 is used to drive the first sliding plate 41 to move. A spring is installed between the first sliding plate 41 and the second sliding plate 42; a third power member 43 is fixedly connected to the second sliding plate 42. A first limiting frame 44 is installed on the third power member 43. The third power member 43 is used to drive the first limiting frame 44 to move. A sliding rod 45 is slidably disposed on the first limiting frame 44. The sliding rod 45 is fixedly connected to a second limiting frame 46. Circumferentially distributed rubber strips are provided on the first limiting frame 44 and the second limiting frame 46, and the rubber strips are used to increase the friction between the first limiting frame 44, the second limiting frame 46 and the object to be tested. The second limiting frame 46 is rotatably provided with a first threaded rod 47, and the first threaded rod 47 is threadedly connected to the first limiting frame 44; a limiting component is disposed on the second limiting frame 46, and the limiting component is used to limit the rotation of adjacent runners 461; the bracket 11 and the fixing frame 12 are rotatably connected, and the first sliding frame 14 and the rotating frame 15 are rotatably connected.

[0028] In the above solution, both the second power member 4 and the third power member 43 are hydraulic push rods. The control panel controls the telescopic ends of the second power member 4 and the third power member 43 to move through an existing hydraulic control system. The first limiting frame 44 is detachably installed on the third power member 43. The first limiting frame 44, the sliding rod 45, the second limiting frame 46, the runner 461 and the first threaded rod 47 form a module unit. The dimensions of the components in this module are set according to simulated bending fatigue tests of different degrees, mainly by setting runners 461 of different sizes.

[0029] Specific working principle: When performing segmented tensile fatigue tests on the steel wire, the operator repeats the above operations to install the steel wire. Subsequently, the operator rotates the first threaded rod 47 to adjust the distance between the second limiting frame 46 and the first limiting frame 44, so that the steel wire is located between the two runners 461, and finally the two runners 461 firmly clamp the steel wire.

[0030] After the two runners 461 complete the clamping of the steel wire, the operator starts the second power member 4 through the control panel. The telescopic end of the second power member 4 drives the first sliding plate 41 to move. The movement of the first sliding plate 41 drives the second sliding plate 42 to move through the spring. The movement of the second sliding plate 42 drives the components connected together, such as the third power member 43, the first limiting frame 44, the sliding rod 45, the second limiting frame 46 and the runner 461, to move together. Due to the limiting effect of the limiting component on the corresponding runner 461, the runner 461 cannot rotate, and the two runners 461 perform tensile fatigue tests on the clamped steel wire.

[0031] During the test, the operator controls the length of the telescopic end of the second power component 4 in advance to control the clamping of the steel wire at different positions by the two rotating wheels 461, so as to facilitate the device to quickly complete the tensile fatigue test on different parts of the steel wire and improve the comprehensiveness of the fatigue test results of the device.

[0032] During the bending fatigue test, the operator repeats the above operations to first complete the fixed installation of the steel wire. Subsequently, the operator rotates the first threaded rod 47 to complete the clamping and fixing of the steel wire by the two rotating wheels 461. Then, the third power component 43 and the first power component 141 are started through the control panel. The control panel controls the injection of liquid into the first power component 141 through the hydraulic control system, and at the same time controls the pressure of the liquid injected into the first power component 141. As the liquid is injected, the telescopic end of the third power component 43 drives the connected parts such as the first limiting frame 44 to move together, so that the two rotating wheels 461 clamp the steel wire and move left and right reciprocally to perform the bending fatigue test on the clamped steel wire.

[0033] As Figure 7 and Figure 8 shown, the limiting component includes: a limiting column 5. The second limiting frame 46 is provided with a sliding cavity, and the limiting column 5 is slidably arranged in the sliding cavity of the second limiting frame 46. The rotating wheel 461 on the second limiting frame 46 is provided with a limiting hole in contact with the limiting column 5; a third sliding plate 51, which is slidably arranged in the sliding cavity of the second limiting frame 46. A spring is installed between the third sliding plate 51 and the limiting column 5. The second limiting frame 46 is threadedly connected with a second threaded rod 6, and the second threaded rod 6 is in contact with the third sliding plate 51.

[0034] In the above solution, the left end of the limiting column 5 is hemispherical, the blind hole on the rotating wheel 461 is hemispherical, and the second threaded rod 6 is screwed into different depths in the second limiting frame 46 to control the elastic force of the spring between the limiting column 5 and the third sliding plate 51.

[0035] Working principle: When performing a segmented tensile fatigue test on the steel wire, the operator first repeats the above operations to control the two rotating wheels 461 to clamp the steel wire. Subsequently, the second power component 4 works to move the two rotating wheels 461 upward through the connected parts, and the two rotating wheels 461 move upward to perform the tensile fatigue test on the steel wire. When the tensile force applied by the second power component 4 during operation is greater than the limiting force of the limiting column 5 on the adjacent rotating wheel 461, the rotating wheel 461 moves to squeeze the limiting column 5 to move, so that the limiting column 5 moves and releases the contact with the blind hole on the rotating wheel 461. Subsequently, the two rotating wheels 461 rotate. When the rotating wheel 461 rotates to make its blind hole face the adjacent limiting column 5 again, the limiting column 5 is inserted into the blind hole of the adjacent rotating wheel 461 again to re-limit the rotation of the rotating wheel 461, so that during the continuous operation of the second power component 4, the two rotating wheels 461 perform a sub-region continuous tensile fatigue test on the steel wire, improving the test efficiency.

[0036] Before performing the segmented tensile fatigue test, the operator rotates the second threaded rod 6. As the second threaded rod 6 rotates, it squeezes the third sliding plate 51 to move, changing the elastic force of the spring between the third sliding plate 51 and the limit post 5, and changing the limiting force of the limit post 5 on the adjacent runner 461. This facilitates the device to perform segmented tensile fatigue tests on the steel wire with different strengths, improving the comprehensiveness of the fatigue test of the device.

[0037] When performing the bending fatigue test, the operator can also rotate the second threaded rod 6 to adjust the third sliding plate 51 to fit the right side of the sliding cavity on the second limiting frame 46, so that the limiting force of the limit post 5 on the adjacent runner 461 is in the minimum state, facilitating the two runners 461 to rotate freely on the first limiting frame 44 and the second limiting frame 46. Subsequently, the operator controls the telescopic end of the third power member 43 to extend to a specified length through the control panel. When the third power member 43 works, the runner 461 is moved and squeezed to reciprocate and bend through the connected parts. Then, the operator makes the telescopic end of the second power member 4 reciprocate through the control panel. The second power member 4 makes the two runners 461 move up and down reciprocally through the connected parts. The two runners 461 move up and down reciprocally to continuously bend and squeeze the steel wire, further improving the comprehensiveness of the bending fatigue test structure, thereby improving the accuracy of the test results.

[0038] It should be noted that the above-mentioned preferred embodiments are only used to illustrate the technical concept and features of the present invention. The purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A fatigue test device for single-filament cord used in electric vehicle tires, characterized in that, It includes: A workbench (1) is installed with a bracket (11), and the bracket (11) is provided with a fixing frame (12); An n-shaped frame (13) is fixedly connected to the workbench (1). A first sliding frame (14) is slidably arranged on the n-shaped frame (13). The n-shaped frame (13) is installed with a first power member (141), and the first power member (141) is used to drive the first sliding frame (14) to move. A rotating frame (15) is arranged on the first sliding frame (14); A rotating sleeve (16) is rotatably arranged on the rotating frame (15); A second sliding frame (17) is slidably arranged on the rotating sleeve (16) in a limiting manner, and a tension spring is installed between the rotating sleeve (16) and the second sliding frame (17); A clamping mechanism is arranged on the fixing frame (12), and the clamping mechanism is used to clamp both ends of the object to be tested; An adjusting mechanism is arranged on the rotating sleeve (16), and the adjusting mechanism is used to control the rotation of the second sliding frame (17) to twist the clamped object to be tested, so as to facilitate a comprehensive simulation test of the object to be tested.

2. The fatigue test device for single-filament cord used in electric vehicle tires according to claim 1, characterized in that, The clamping mechanism includes: There are two electric push rods (2), which are respectively fixedly connected to the fixing frame (12) and the second sliding frame (17); There are two fixing plates (21), which are respectively fixedly connected to the telescopic ends of the adjacent electric push rods (2). Two symmetrically distributed third sliding frames (22) are slidably arranged on both the fixing frame (12) and the second sliding frame (17). The third sliding frame (22) is provided with a convex column, and the fixing plate (21) is provided with two symmetrically distributed inclined slots. The convex column of the third sliding frame (22) slides in the adjacent inclined slots on the adjacent fixing plate (21).

3. The fatigue test device for single-filament cord used in electric vehicle tires according to claim 2, wherein, The third sliding frame (22) is provided with a limiting groove (221), and the limiting groove (221) is used to limit the position of the object to be tested.

4. The fatigue test device for single-filament cord used in electric vehicle tires according to claim 2, characterized in that, A sliding block (23) is slidably arranged on the third sliding frame (22). A spring is installed between the sliding block (23) and the adjacent third sliding frame (22), and the sliding block (23) is provided with an elastic pad.

5. The fatigue test device for single-filament cord used in electric vehicle tires according to claim 1, wherein The adjusting mechanism includes: A worm gear (3) is fixedly connected to the rotating sleeve (16); A worm (31) is rotatably arranged on the rotating frame (15) and meshes with the worm gear (3); A motor (32) is fixedly connected to the rotating frame (15), and the output shaft of the motor (32) is fixedly connected to the worm (31).

6. The fatigue test device for single-filament cord used in electric vehicle tires according to claim 1, characterized in that, It also includes: A stretching mechanism is arranged on the workbench (1), and the stretching mechanism is used to perform a segmented stretching test on the object to be tested. The stretching mechanism includes: A second power member (4) is fixedly connected to the workbench (1). A first sliding plate (41) and a second sliding plate (42) are slidably arranged on the n-shaped frame (13). The second power member (4) is used to drive the first sliding plate (41) to move, and a spring is installed between the first sliding plate (41) and the second sliding plate (42); The third power member (43) is fixedly connected to the second sliding plate (42). The first limiting frame (44) is installed on the third power member (43). The third power member (43) is used to drive the first limiting frame (44) to move. A sliding rod (45) is slidably arranged on the first limiting frame (44). The second limiting frame (46) is fixedly connected to the sliding rod (45). The first limiting frame (44) and the second limiting frame (46) are both rotatably provided with runners (461). The second limiting frame (46) is rotatably provided with a first threaded rod (47). The first threaded rod (47) is threadedly connected to the first limiting frame (44). The limiting assembly is arranged on the second limiting frame (46). The limiting assembly is used to limit the rotation of adjacent runners (461).

7. The single-filament cord fatigue test device for an electric vehicle tire according to claim 6, wherein, The bracket (11) is rotatably connected to the fixed frame (12). The first sliding frame (14) is rotatably connected to the rotating frame (15).

8. An apparatus for fatigue test of monofilament cord for electric vehicle tires according to claim 6, characterized in that, Circumferentially distributed rubber strips are arranged on the runner (461) to increase the friction between it and the object to be measured.

9. The single-filament cord fatigue test device for an electric vehicle tire according to claim 6, wherein, The limiting assembly includes: A limiting post (5). The second limiting frame (46) is provided with a sliding cavity. The limiting post (5) is slidably arranged in the sliding cavity of the second limiting frame (46). The runner (461) on the second limiting frame (46) is provided with a limiting hole in contact with the limiting post (5). A third sliding plate (51) is slidably arranged in the sliding cavity of the second limiting frame (46). A spring is installed between the third sliding plate (51) and the limiting post (5).

10. The fatigue test device for single-filament cord used in electric vehicle tires according to claim 9, characterized in that, The second limiting frame (46) is threadedly connected to a second threaded rod (6). The second threaded rod (6) is in contact with the third sliding plate (51).

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