Flexing test apparatus and method

Abstract

The application discloses a flexing test device and method, the flexing test device comprises a side rod pushing system, a pre-tensioning system, a measuring system and a control system; the application can simulate the stretching of the material formed by the internal pressure of the tire by elongating the sample and applying preloading to the sample, and can reflect the actual stress state of the tire material; the application can adjust the flexing degree of the sample flexing test by adjusting the displacement of the reciprocating motion of the side rod; and the application can form different flexing shapes and non-uniform deformations of the test by changing the head shape and width of the side rod head, so as to simulate the real deformation of the tire contact area. The application can adjust the flexing degree of the sample flexing test, can form different flexing shapes and non-uniform deformations of the test, and can simulate the real deformation of the tire contact area, thereby providing a test basis for measuring the flexing resistance of the material and structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flexing test, in particular to a flexing test device and method. BACKGROUND

[0002] Whether it is an airplane or a car, the tire is an indispensable part of its normal operation. As the only part of the airplane or car in contact with the ground, the performance of the tire during driving can be directly fed back to the whole, affecting the safety, power, stability, smoothness and noise of driving.

[0003] During the use of the pneumatic tire, first, the tire is inflated to make the tire swell to a certain extent, and then it is usually used under periodic stress. When the tire sinks due to bearing load, the tire contact area extends from the tread to the shoulder and even the sidewall, and periodic flexing deformation occurs during rolling, and the flexing deformation is not uniform.

[0004] The tire is a complex rubber body composed of cord layers, cushion layers, triangular rubber strips, steel wire rings, etc., and the overall structure is composed of materials with different properties. The flexing deformation performance of these materials and structures under complex stress state will directly determine the safety and life of the tire, so it is necessary to conduct flexing test on these materials and structures.

[0005] The utility model patent with the application number CN2021202827902 discloses a rubber flexing crack testing machine, which can test the performance of rubber in different directions, making the test results more accurate, and can test rubber of different sizes, but it cannot simulate the internal pressure state and non-uniform flexing deformation in the actual working condition of the tire.

[0006] The invention patent with the application number 202311721998X discloses an aviation tire component flexing test device and method, which is mainly aimed at the tire components, intercepts the tire cross section, and assembles the whole to the testing machine for flexing performance test. It cannot test the materials and structures that make up the tire, cannot simulate the internal pressure state of the tire, and the flexing state is consistent, which cannot simulate non-uniform flexing deformation.

[0007] In order to solve the problems in the prior art that the materials and structures that make up the tire cannot be tested, the internal pressure state in the actual working condition of the tire cannot be simulated, and non-uniform flexing deformation cannot be simulated, a flexing test device and method need to be developed to solve the problems. SUMMARY

[0008] The purpose of the present application is to design a flexing test device and method to solve the above problems.

[0009] The present application achieves the above-mentioned purpose through the following technical solutions:

[0010] The bending test device comprises:

[0011] A side rod pushing system for laterally reciprocating pushing the sample; the side rod pushing system is installed on one side of the sample;

[0012] A pre-tensioning system; the pre-tensioning system comprises a crossbeam, a driving shaft, a force sensor, an upper chuck, a lower chuck, and a base, the base is fixedly arranged, the lower chuck is installed on the base, the lower end of the sample is clamped and installed on the lower chuck, the crossbeam is adjustably arranged on the device frame, the driving shaft and the force sensor are vertically arranged, the driving shaft is adjustably installed on the crossbeam, the first end of the force sensor is installed on the lower end of the driving shaft, the second end of the force sensor is connected with the upper chuck, and the upper end of the sample is clamped and installed on the upper chuck;

[0013] A measuring system for measuring the temperature of the sample or the change of the ambient temperature in the bending test device;

[0014] A control system; the control signal output end of the control system is connected with the control signal input end of the side rod pushing system and the control signal input end of the pre-tensioning system, and the signal output end of the measuring system is connected with the signal input end of the control system.

[0015] Specifically, the side rod pushing system comprises a side rod power source, a side rod base, a side rod support, and a side rod, the side rod base is fixedly arranged, the side rod support is adjustably installed above the side rod base, the side rod is horizontally arranged, the side rod is adjustably installed in the side rod support, the first end of the side rod is connected with the power output end of the side rod power source, and the second end of the side rod acts on the sample.

[0016] Specifically, the side rod comprises a side rod shaft and a side rod head, the first end of the side rod shaft is connected with the power output end of the side rod power source, the second end of the side rod shaft is connected with the tail of the side rod head, and the head of the side rod head acts on the sample.

[0017] As a preferred option, the head of the side rod head is formed as a plane.

[0018] As another preferred option, the head of the side rod head is formed as a circular arc surface.

[0019] Preferably, the side rod power source is one of an electric system, a pneumatic system, or a hydraulic system.

[0020] Preferably, the measuring system is at least one of a plurality of temperature sensors or a thermal imager, and when the measuring system is the plurality of temperature sensors, the plurality of temperature sensors are attached to the sample.

[0021] Preferably, the control system is a PLC system.

[0022] Preferably, the sample is a planar sheet.

[0023] The test method of the bending test device comprises the following steps:

[0024] a. Lower the crossbeam and the driving shaft, so that the distance between the upper chuck and the lower chuck is less than the length of the sample;

[0025] b. Clamping the sample on the upper chuck and the lower chuck;

[0026] c. Lifting the crossbeam to straighten the sample, and fixing the position of the crossbeam;

[0027] d. Lifting the driving shaft to elongate the sample, and stopping the driving shaft when the tension reaches the calculated tension according to the tire internal pressure, and fixing the position of the driving shaft;

[0028] e. Adjusting the position of the side rod support so that the side rod head abuts against the sample;

[0029] f. Inputting the displacement value and frequency of the side rod oscillation in the control system, starting the side rod power source, and performing the bending test;

[0030] g. Collecting the longitudinal force, lateral force, temperature and frequency of the sample in real time during the test, and stopping the test when the test purpose is achieved.

[0031] The present application has the following advantages:

[0032] The present application can simulate the stretching of the material caused by the tire internal pressure by elongating the sample by lifting the driving shaft and applying a preload to the sample, and can reflect the actual stress state of the tire material.

[0033] The present application can adjust the bending degree of the sample bending test by adjusting the displacement of the reciprocating motion of the side rod.

[0034] The present application can form different bending shapes and non-uniform deformations of the test by changing the shape and width of the head of the side rod head, and can simulate the actual deformation of the tire contact area.

[0035] The present application can simulate the stretching of the material caused by the tire internal pressure, can adjust the bending degree of the sample bending test, and can form different bending shapes and non-uniform deformations of the test by the innovative design of the pre-tensioning system and the side rod pushing system of the testing machine. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is the structure diagram of the tire bending test device of the present application;

[0037] Figure 2A schematic diagram of the side rod structure in Example 1.

[0038] Figure 3 A schematic diagram of the side rod structure in Example 2.

[0039] In the figure: 1. Side rod base; 2. Side rod support; 3. Side rod; 301. Side rod shaft; 302. Side rod head; 4. Side rod power source; 5. Control system; 6. Crossbeam; 7. Main shaft; 8. Force sensor; 9. Upper chuck; 10. Specimen; 11. Temperature sensor; 12. Thermal imager; 13. Lower chuck; 14. Base. DETAILED DESCRIPTION

[0040] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative work fall within the scope of protection of the present application.

[0042] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0043] In the description of the present application, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the present application is used, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0044] In addition, the terms "first", "second", etc. are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0045] In the description of the present application, it is also necessary to explain that, unless otherwise explicitly specified and limited, the terms such as "arrangement", "connection" should be understood in a broad sense, for example, "connection" can be fixed connection, or detachable connection, or integral connection; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0047] As shown in the figure, the bending test device and method comprises: Figures 1-3

[0048] A side rod 3 pushing system for laterally reciprocating pushing the sample 10; the side rod 3 pushing system is installed on one side of the sample 10;

[0049] A pre-tensioning system; the pre-tensioning system comprises a cross beam 6, a driving shaft 7, a force sensor 8, an upper chuck 9, a lower chuck 13, a base 14, the base 14 is fixedly arranged, the lower chuck 13 is installed on the base 14, the lower end of the sample 10 is clamped and installed on the lower chuck 13, the cross beam 6 is adjustably arranged on the device frame in up and down positions, the driving shaft 7 and the force sensor 8 are vertically arranged, the driving shaft 7 is adjustably installed on the cross beam 6 in up and down positions, the first end of the force sensor 8 is installed on the lower end of the driving shaft 7, the second end of the force sensor 8 is connected with the upper chuck 9, and the upper end of the sample 10 is clamped and installed on the upper chuck 9;

[0050] A measuring system for measuring the temperature of the sample 10 or the change of the environmental temperature in the bending test device;

[0051] A control system 5; the control signal output end of the control system 5 is connected with the control signal input end of the side rod 3 pushing system and the control signal input end of the pre-tensioning system respectively, and the signal output end of the measuring system is connected with the signal input end of the control system 5.

[0052] As shown in the figure, the bending test device and method comprises: Figure 1 ​As shown, the side rod 3 pushing system includes a side rod power source 4, a side rod base 1, a side rod support 2, and a side rod 3. The side rod base 1 is fixedly arranged, the side rod support 2 is adjustably arranged above the side rod base 1 (and can be fixed after adjustment), the side rod 3 is horizontally arranged, the side rod 3 is slidably arranged in the side rod support 2, the first end of the side rod 3 is connected to the power output end of the side rod power source 4, and the second end of the side rod 3 acts on the sample 10. The side rod 3 includes a side rod shaft 301 and a side rod head 302. The first end of the side rod shaft 301 is connected to the power output end of the side rod power source 4, the second end of the side rod shaft 301 is connected to the tail of the side rod head 302, and the head of the side rod head 302 acts on the sample 10. The side rod 3 reciprocates along its axis, and the reciprocating motion is generated by the side rod power source 4. The side rod power source 4 is one of an electric system, a pneumatic system, or a hydraulic system, and can adopt an eccentric wheel mode or a reciprocating cylinder or other mode. The width of the side rod head 302 can be greater than or less than the width of the sample 10. The side rod shaft 301 is connected to the power source to transmit reciprocating motion. The displacement and frequency of the side rod 3 are adjustable.

[0053] In some embodiments, as shown in FIG. 1, the side rod head 302 is formed as a flat surface. Figure 2

[0054] In some embodiments, as shown in FIG. 1, the side rod head 302 is formed as a flat surface. Figure 3 In some embodiments, as shown in FIG. 1, the side rod head 302 is formed as a flat surface.

[0055] In some embodiments, the measurement system is at least one of a plurality of temperature sensors 11 or a thermal imager 12. When the measurement system is the plurality of temperature sensors 11, the plurality of temperature sensors 11 are attached to the sample 10. The temperature sensors 11 are attached to different parts of the sample 10 to measure the temperature changes of each point during the test. When the measurement system is the thermal imager 12, the dynamic temperature changes of the whole field are measured.

[0056] In some embodiments, the control system 5 is a PLC system or a further control scheme. The control system 5 is operated and controlled, and the test data is collected and stored.

[0057] In some embodiments, the sample 10 is a flat sheet, or can be of other shapes.

[0058] The test method of the flexural test device includes the following steps:

[0059] ​a. Lower the crossbeam 6 and the driving shaft 7, so that the distance between the upper chuck 9 and the lower chuck 13 is less than the length of the sample 10;

[0060] b. Clamping the sample 10 to the upper chuck 9 and the lower chuck 13;

[0061] c. Lifting the crossbeam 6, straightening the sample 10, and fixing the position of the crossbeam 6;

[0062] d. Lifting the driving shaft 7, lengthening the sample 10, and stopping the driving shaft 7 when the tension reaches the calculated value according to the tire internal pressure (the tension can also be zero), and fixing the position of the driving shaft 7;

[0063] e. Adjusting the position of the side rod support 2 so that the side rod head 302 abuts against the sample 10;

[0064] f. Inputting the displacement value and frequency of the side rod 3 oscillation in the control system 5, starting the side rod power source 4, and conducting the flexing test;

[0065] g. Collecting the longitudinal force, transverse force, temperature, and frequency of the sample 10 in real time during the test, and stopping the test when the test purpose is achieved.

[0066] The tire flexing test device of the present application has simple structure, convenient operation, and test method that can simulate the actual working conditions of the tire, such as the internal pressure state and the non-uniform flexing deformation state, thereby providing a basis for measuring the flexing resistance of the material and structure. The present application can also be used for flexing test of other materials and structures, such as leather, rubber, and cord fabric.

[0067] The above description is only the preferred embodiment of the present application, and it should be noted that those skilled in the art can make several improvements and refinements without departing from the technical principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. Flexure test device, characterized in that, include: A side rod pushing system for pushing the specimen back and forth laterally; the side rod pushing system is installed on one side of the specimen; Pre-tensioning system; the pre-tensioning system includes a crossbeam, an active shaft, a force sensor, an upper chuck, a lower chuck, and a base. The base is fixed in a fixed position, the lower chuck is installed on the base, the lower end of the sample is clamped and installed on the lower chuck, the crossbeam is adjustable in position up and down and is placed on the device frame, the active shaft and the force sensor are both vertically arranged, the active shaft is adjustable in position up and down and is installed on the crossbeam, the first end of the force sensor is installed on the lower end of the active shaft, the second end of the force sensor is connected to the upper chuck, and the upper end of the sample is clamped and installed on the upper chuck; Measuring system for measuring specimen temperature or ambient temperature changes in flexure test equipment; Control system; the control signal output end of the control system is connected to the control signal input end of the side rod propulsion system and the control signal input end of the pre-tensioning system respectively, and the signal output end of the measurement system is connected to the signal input end of the control system.

2. The flexure test device according to claim 1, characterized in that: The side rod pushing system includes a side rod power source, a side rod base, a side rod support, and a side rod. The side rod base is fixed in a fixed position, and the side rod support is installed above the side rod base with an adjustable horizontal position. The side rod is horizontally set and installed in the side rod support in a horizontally slidable manner. The first end of the side rod is connected to the power output end of the side rod power source, and the second end of the side rod acts on the specimen.

3. The flexure test device according to claim 2, characterized in that: The side rod includes a side rod shaft and a side rod head. The first end of the side rod shaft is connected to the power output end of the side rod power source, the second end of the side rod shaft is connected to the tail of the side rod head, and the head of the side rod head acts on the sample.

4. The flexure test device according to claim 3, characterized in that: The head of the side rod head is formed into a flat surface.

5. The flexure test device according to claim 3, characterized in that: The head of the side rod head is formed into an arc surface.

6. The flexure test device according to claim 2, characterized in that: The side rod power source is one of an electric system, a pneumatic system or a hydraulic system.

7. The flexure test device according to claim 1, characterized in that: The measuring system is at least one of a plurality of temperature sensors or a thermal imager. When the measuring system is a plurality of temperature sensors, the plurality of temperature sensors are attached to the sample.

8. The flexure test device according to claim 1, characterized in that: The control system is a PLC system.

9. The flexure test device according to claim 1, characterized in that: The specimen is in the form of a flat sheet.

10. The testing method of the flexure testing device according to claim 3, characterized in that: The following steps are involved: a. Lower the crossbeam and driving shaft so that the distance between the upper and lower chucks is less than the length of the specimen; b. Clamp the specimen onto the upper and lower chucks; c. Lift the crossbeam, straighten the specimen, and fix the crossbeam position; d. Lift the driving shaft and stretch the specimen. When the pulling force reaches the force calculated based on the tire internal pressure, stop the driving shaft and fix its position. e. Adjust the position of the side rod support so that the side rod head rests against the specimen; f. Input the displacement and frequency of the sidebar oscillation into the control system, turn on the sidebar power source, and conduct a flexural test; g. During the test, the longitudinal force, lateral force, temperature and frequency of the sample are collected in real time. When the test objective is achieved, the test is stopped.

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