A flex fatigue test device

Abstract

The utility model discloses a kind of flexural fatigue test testing devices, comprising: drive transmission assembly, including drive motor, transmission mechanism and rotary disc;Pressure control assembly, including the control valve group communicated by pipeline;Wherein, transmission mechanism is connected with drive motor and rotary disc respectively, and the sample to be measured is installed on rotary disc;Control valve group includes check valve, multi-way valve and pressure reducing valve, and the sample to be measured is communicated with gas supply end by the pipeline with the control valve group being set up.This utility model is rotated by drive motor driving transmission mechanism and rotary disc, and rotary frequency is regulated with cooperation speed sensor;Pressure value of gas supply pipeline is adjusted in combination with pressure reducing valve and check valve, and pipeline pressure value is monitored in real time with cooperation pressure sensor;When sample is abnormal or leakage occurs, it can be quickly identified to stop running, and test running data is recorded, accurate rotational speed and pressure control are realized, and the experimental demand of flexural fatigue test for new energy automobile industry parts is effectively satisfied.

Description

Technical Field

[0001] This utility model relates to the field of flexural fatigue testing technology, and specifically to a flexural fatigue testing device. Background Technology

[0002] Flexural fatigue testing is a mechanical property testing method that evaluates the fatigue resistance and fatigue life of materials or components under repeated alternating flexural (bending) stress. In the test, periodic bending stress is usually applied to the specimen through loading methods such as three-point bending and four-point bending, and the cycle is continued until the specimen shows visible cracks, fractures, or reaches a preset number of cycles. During the test, the stiffness change, deformation accumulation and other indicators of the specimen are monitored.

[0003] In the design and quality verification of core components of new energy vehicles (such as hydraulic brake pipes), flexural fatigue testing is a key test item for evaluating such products. The speed and pressure control of existing flexural fatigue equipment on the market are unstable. Long-term use will lead to pressure leakage in the test pipeline, resulting in a sudden drop in pressure or sudden pressure loss during testing. In this case, not only does the entire pipeline need to be replaced, but the sample may also be scrapped due to test interruption, increasing additional costs. Utility Model Content

[0004] The purpose of this invention is to provide a flexural fatigue testing device to solve the above problems.

[0005] To achieve the above objectives, this utility model specifically adopts the following technical solution, including:

[0006] The drive transmission assembly, including a drive motor, a transmission mechanism, and a rotating disk, is used to drive the sample to be tested to rotate.

[0007] Pressure control components, including a control valve assembly connected by a pipeline, for monitoring the compressed gas delivered at the gas supply end;

[0008] The transmission mechanism is connected to the drive motor and the rotating disk, and the sample to be tested is mounted on the rotating disk; the control valve group includes a one-way valve, a multi-way valve and a pressure reducing valve, and the sample to be tested is connected to the gas supply end through a pipeline equipped with the control valve group.

[0009] As a further description of the above technical solution, the transmission mechanism includes multiple sets of gears and a transmission chain.

[0010] As a further description of the above technical solution, each set of gears is rotatably connected to a set of rotating disks.

[0011] As a further description of the above technical solution, the two adjacent sets of gears are rotatably connected by a transmission chain.

[0012] As a further description of the above technical solution, a set of gears is rotatably connected to the output end of the drive motor.

[0013] As a further description of the above technical solution, a speed sensor is provided on one side of the rotating disk.

[0014] As a further description of the above technical solution, the multi-way valve is connected to the one-way valve and the pressure reducing valve respectively through pipelines.

[0015] As a further description of the above technical solution, the one-way valve is connected to the sample to be tested through a pipeline.

[0016] As a further description of the above technical solution, a pressure sensor is provided on the pipeline connecting the one-way valve and the sample to be tested.

[0017] As a further description of the above technical solution, the pressure reducing valve is connected to the gas supply end through a pipeline.

[0018] The beneficial effects of this utility model are as follows:

[0019] In this utility model, a drive motor drives the transmission mechanism and rotating disk to rotate, and a speed sensor controls the rotation frequency. A pressure reducing valve and a one-way valve are used to adjust the pressure value of the air supply pipeline, and a pressure sensor monitors the pipeline pressure value in real time. When an abnormality or leakage occurs in the sample during the experiment, the system can quickly identify and stop the operation, and record the test data. This achieves precise speed and pressure control, effectively meeting the experimental requirements of the new energy vehicle industry for flexural fatigue testing of components.

[0020] To more clearly illustrate the structural features and functions of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the flexural fatigue testing device of this utility model.

[0022] Figure label:

[0023] 1. Drive transmission assembly; 11. Drive motor; 12. Transmission mechanism; 121. Gear; 122. Transmission chain; 13. Rotary disc; 14. Speed ​​sensor; 2. Pressure control assembly; 21. Control valve group; 211. Check valve; 212. Multi-way valve; 213. Pressure reducing valve; 22. Piping; 23. Pressure sensor; 3. Sample to be tested; 4. Gas supply end. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0025] like Figure 1 As shown, in one embodiment, a flexural fatigue test apparatus includes: a drive transmission assembly 1 and a pressure control assembly 2;

[0026] The drive transmission assembly 1 includes a drive motor 11, a transmission mechanism 12, and a rotating disk 13. Specifically, the drive motor 11 is a variable frequency speed control motor (e.g., with a speed range of 50-2000 rpm), which can flexibly adjust the output speed according to different test standards (e.g., Q / LiA9247001-2023, etc.) to provide continuous and controllable driving power for the transmission mechanism 12.

[0027] Specifically, the transmission mechanism 12 is connected to the drive motor 11 and the rotating disk 13 respectively. The sample to be tested 3 is mounted on the rotating disk 13, so that the drive transmission mechanism 12 can smoothly transmit the torque of the drive motor 11 to the rotating disk 13, and finally drive the sample to be tested 3 fixed on the rotating disk 13 to rotate synchronously, simulating the periodic bending motion of the sample in actual use.

[0028] Correspondingly, the pressure control component 2 includes a control valve group 21 connected via pipeline 22, used to simulate the fluid pressure environment experienced by the sample 3 under actual working conditions, adjust the pressure of the compressed gas delivered by the gas supply end 4 (e.g., gas cylinder, air compressor, etc.), and monitor the gas flow status in real time.

[0029] Specifically, the sample 3 to be tested is connected to the gas supply end 4 through the pipeline 22 equipped with the control valve group 21, so as to ensure that the internal pressure of the sample remains stable within the set range during the test and avoid the impact of pressure fluctuation on the accuracy of the test results.

[0030] Please continue reading. Figure 1 In this embodiment, the transmission mechanism 12 includes multiple sets of gears 121 and transmission chains 122, which are used to transmit the power of the drive motor 11, drive the rotating disk 13 to move synchronously, and control the rotation radius of the sample to be tested 3 within a preset range (e.g., 0-300mm) to realize the synchronous testing of multiple sets of samples to be tested 3.

[0031] For example, each set of gears 121 is rigidly connected to the central shaft of a set of rotating disks 13 via a flat key, ensuring that the gears 121 can drive the rotating disks 13 to rotate without eccentricity when they rotate; correspondingly, two adjacent sets of gears 121 are connected by a transmission chain 122, and one set of gears 121 is rotatably connected to the output end of the drive motor 11.

[0032] It should be noted that a speed sensor 14 is provided on one side of the rotating disk 13 to monitor the speed of the rotating disk 13 in real time, thereby adjusting the speed of the variable frequency drive motor 11 to avoid speed control problems.

[0033] For example, the speed sensor 14 can be a Hall effect non-contact sensor (sampling frequency ≥100Hz, measurement range 0-3000rpm, accuracy ±0.1% FS), and its probe is fixed at a certain distance (2-3mm) from the edge of the rotating disk 13 by a bracket; when the sensor detects that the speed of the rotating disk 13 deviates from the set value, it will immediately transmit the speed deviation signal to the controller of the drive motor 11 (as prior art, this is not explicitly stated in the original text). Figure 1 (As shown in the diagram) Subsequently, the controller sends a control signal to adjust the output frequency of the variable frequency drive motor 11, thereby correcting the motor speed and stabilizing the speed of the rotating disk 13 within the set range. This solves the problem of large speed fluctuations and can also flexibly adjust the speed control accuracy according to the test stage (such as the preheating stage or the stabilization test stage) to meet the needs of different test scenarios.

[0034] Please continue reading. Figure 1 In this embodiment, the control valve group 21 includes a one-way valve 211, a multi-way valve 212, and a pressure reducing valve 213. The one-way valve 211 is used to prevent compressed gas from flowing back from the sample 3 pipeline 22 to the gas supply end 4, avoiding a sudden drop in pressure in the sample pipeline 22 due to pressure fluctuations at the gas supply end 4 (e.g., a drop in the pressure of the gas storage bottle), and ensuring pressure stability. The multi-way valve 212 can be a four-way valve or the like, used to evenly distribute the compressed fluid delivered by the gas supply end 4 to multiple branch pipes, with each branch pipe corresponding to a set of samples 3 to be tested. The pressure reducing valve 213 is used to adjust the fluid pressure value output by the gas supply end 4 to avoid pressure runaway problems.

[0035] For example, the inlet of the multi-way valve 212 is connected to the outlet of the pressure reducing valve 213 through the high-pressure pipeline 22, and the outlet of the multi-way valve 212 is connected to the inlet of each group of one-way valves 211 through multiple branch pipes; correspondingly, the outlet of the one-way valve 211 is connected to the fluid inlet of the sample 3 to be tested through the high-pressure pipeline 22, and the inlet of the pressure reducing valve 213 is connected to the gas supply end 4 (e.g., a gas storage cylinder) through the pipeline 22, ensuring that the gas can only flow from the multi-way valve 212 to the sample 3 to be tested and cannot flow in the opposite direction.

[0036] It should be noted that a pressure sensor 23 is installed on the pipeline 22 connecting the one-way valve 211 and the sample 3 to be tested, which is used to monitor the pressure changes of the pipeline 22 in real time and can stop the equipment operation in time when a leak occurs.

[0037] For example, the pressure sensor 23 can be a diffused silicon pressure sensor 23 (measuring range 0-5MPa, accuracy ±0.25% FS, response time ≤1ms, temperature drift ≤±0.01% FS / ℃, stable operation in ambient temperatures of -40~85℃) to ensure the accuracy of pressure data during testing; the sensor is connected to the pipeline 22 through a high-pressure connector, directly contacting the fluid, and can collect the pressure value at the inlet of the sample 3 in real time, and transmit the data to the main controller in the form of analog or digital signals (as prior art, this is not included in the text). Figure 1 As shown in the diagram, when the pressure drops below a preset value (e.g., 0.05 MPa) within a preset time (e.g., 5 seconds), a leak is determined to have occurred: First, an emergency stop command is sent to the drive motor 11 to stop the rotating disk 13, preventing further damage to the sample due to continued testing in a leaking state; then, the compressed gas supply is cut off to prevent continuous high-pressure gas leakage from causing safety risks; subsequently, a signal is sent to the host computer (as per existing technology, this is not shown in the diagram). Figure 1 (As shown in the diagram) It will issue an audible and visual alarm (red alarm light flashing, buzzer sounding, etc.) to remind operators to deal with it in time, and simultaneously record the test parameter information before and after the leak occurred.

[0038] Working principle:

[0039] The rotating disk 13 is used to move the sample 3 to be tested (in this application, it is a brake tube). The rotating disk 13 includes a horizontally placed plate. The two ends of the plate are fixed to a vertically rotating disk by bearings. The distance between the center of the bearing and the center of the disk is a set value (e.g., 101.6 mm).

[0040] Adjust the stationary end plate to be parallel to the moving end plate and to be on the same horizontal plane as the center of the disk. Then fix a set of hose connectors on each of the two plates so that the hose assembly can be fixed on them in parallel.

[0041] The moving end of the hose is sealed, and the stationary end is connected to the air supply end 4 (a gas cylinder in this application). During testing, the rotation speed of the disc needs to be preset (e.g., 800±10 rpm). The moving end of the hose is fixed on the disc and moves in a circle along a preset diameter (e.g., 203.20±0.25 mm), while the other end of the hose remains stationary. During the test, the hose assembly needs to maintain a stable pressure (e.g., 1.55~1.72 MPa). When the sample experiences abnormal conditions such as pressure leakage (e.g., brake pipe crack) or abnormal rotation speed (e.g., motor failure causing a sudden increase in rotation speed), it can be quickly identified and an emergency stop can be triggered to prevent further damage to the sample or cause a safety accident. At the same time, all test data at the time of the abnormality are fully recorded, providing key evidence for failure analysis.

[0042] Through the above technical solution, when the sample is abnormal or leaks during the experiment, this application can quickly identify and stop the operation, and record the test operation data, thus achieving precise speed and pressure control and effectively meeting the experimental needs of the new energy vehicle industry for flexural fatigue testing of components.

[0043] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A flexural fatigue testing device, characterized in that, include: The drive transmission assembly (1) includes a drive motor (11), a transmission mechanism (12) and a rotating disk (13), which is used to drive the sample (3) to be tested to rotate. The pressure control assembly (2) includes a control valve group (21) connected via a pipeline (22) for monitoring the compressed gas delivered at the gas supply end (4); The transmission mechanism (12) is connected to the drive motor (11) and the rotating disk (13) respectively, and the sample to be tested (3) is mounted on the rotating disk (13); the control valve group (21) includes a one-way valve (211), a multi-way valve (212) and a pressure reducing valve (213), and the sample to be tested (3) is connected to the gas supply end (4) through the pipeline (22) provided with the control valve group (21).

2. The flexural fatigue testing apparatus according to claim 1, characterized in that, The transmission mechanism (12) includes multiple sets of gears (121) and a transmission chain (122).

3. The flexural fatigue testing apparatus according to claim 2, characterized in that, Each set of gears (121) is rotatably connected to a set of rotating disks (13).

4. The flexural fatigue testing apparatus according to claim 2, characterized in that, The two adjacent sets of gears (121) are rotatably connected by a transmission chain (122).

5. The flexural fatigue testing apparatus according to claim 2, characterized in that, A set of gears (121) is rotatably connected to the output end of the drive motor (11).

6. The flexural fatigue testing apparatus according to claim 3, characterized in that, A speed sensor (14) is provided on one side of the rotating disk (13).

7. The flexural fatigue testing apparatus according to claim 1, characterized in that, The multi-way valve (212) is connected to the one-way valve (211) and the pressure reducing valve (213) respectively through the pipeline (22).

8. The flexural fatigue testing apparatus according to claim 7, characterized in that, The one-way valve (211) is connected to the sample to be tested (3) through a pipeline (22).

9. The flexural fatigue testing apparatus according to claim 8, characterized in that, A pressure sensor (23) is installed on the one-way valve (211) and the pipeline (22) connecting the sample to be tested (3).

10. The flexural fatigue testing apparatus according to claim 7, characterized in that, The pressure reducing valve (213) is connected to the gas supply end (4) through the pipeline (22).

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