Tension hoop elastic fatigue testing device

Abstract

The utility model discloses a tension hoop elastic fatigue testing device which comprises an operation table, two sliding rods are fixedly installed on the upper end face of the operation table through two fixing plates, two moving blocks are jointly installed on the outer walls of the two sliding rods in a sliding mode, and electric push rods are fixedly installed on the inner walls of the two fixing plates. The telescopic ends of the two electric push rods are fixedly connected with the outer walls of the moving blocks on the same side, and connecting plates are fixedly installed on the upper end faces of the two moving blocks. According to the utility model, through the arrangement of the slide bar, the moving block, the electric push rod and other components, the electric push rod stretches out and draws back to drive the moving block to slide on the slide bar and accurately adjust the distance between the two support plates, so that the device can adapt to pull hoops of different sizes and specifications, a tool clamp does not need to be replaced, the universality and the detection efficiency of the device are greatly improved, and meanwhile, the detection efficiency is improved. Automatic driving of the electric push rod replaces a traditional manual adjusting mode, manual operation errors are reduced, and the accuracy and consistency of the clamping position of the pull hoop are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of mechanical parts testing technology, and in particular to a tension hoop elastic fatigue testing device. Background Technology

[0002] A tie is a metal hoop (such as a rebar hoop or pipe fastening hoop) used in construction to reinforce or connect components. It is commonly used in concrete structures or pipe installations.

[0003] During long-term use, tie rods are subjected to repeated stresses caused by various factors such as vibration, temperature changes, and pressure fluctuations, which can easily lead to elastic fatigue failure, thereby affecting the safety and reliability of the system. Therefore, elastic fatigue testing of tie rods is necessary. In existing technologies, the clamping mechanisms of traditional devices are mostly designed with fixed dimensions, requiring customized tooling for different specifications of tie rods. Changing the clamps is time-consuming and labor-intensive, which cannot meet the rapid testing needs of multiple product models and lacks versatility. Therefore, it is necessary to redesign a tie rod elastic fatigue testing device to address the above problems. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a tension hoop elastic fatigue testing device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A device for testing the elastic fatigue of a tie rod includes an operating table. Two sliding rods are fixedly mounted on the upper surface of the operating table via two fixed plates. Two movable blocks are slidably mounted on the outer walls of the two sliding rods. Electric actuators are fixedly mounted on the inner walls of both fixed plates. The telescopic ends of the two electric actuators are respectively fixedly connected to the outer walls of the movable blocks on the same side. Connecting plates are fixedly mounted on the upper surfaces of both movable blocks. Prismatic rods are fixedly mounted on the upper surfaces of both connecting plates via moving grooves. Sliding blocks are slidably mounted on the outer walls of both prismatic rods. The outer walls of both sliding blocks are connected to the inner walls of the moving grooves on the same side via a reset mechanism. Support plates are fixedly mounted on the upper surfaces of both sliding blocks. Fixed openings are provided on the outer walls of both support plates. Fixed bolts are rotatably mounted on the upper surfaces of both support plates via threads. An installation frame is fixedly mounted on the upper surface of the operating table via a support frame. A movable plate is fixedly connected inside the installation frame via a lifting mechanism. A contact pressure sensor is fixedly mounted on the bottom wall of the movable plate. A displacement sensor is fixedly mounted on the upper surface of the operating table.

[0007] Preferably, the reset mechanism includes a spring mounted on the outer wall of the prism rod, with both ends of the spring elastically connected to the inner wall of the moving groove and the outer wall of the slider, respectively.

[0008] Preferably, the lifting mechanism includes a servo electric cylinder fixedly installed inside the mounting frame, and the upper end face of the support frame has a telescopic opening that cooperates with the telescopic end of the servo electric cylinder. The telescopic end of the servo electric cylinder is fixedly connected to the upper end face of the moving plate.

[0009] Preferably, a connecting plate is fixedly installed on the bottom wall of the movable plate, and an infrared thermometer is fixedly installed on the outer wall of the connecting plate.

[0010] Preferably, a stabilizing rod is fixedly installed on the upper surface of the movable plate, and the stabilizing rod slides through the support frame.

[0011] Preferably, an installation plate is fixedly installed on the upper surface of the operating platform, and a display control terminal is fixedly installed on the outer wall of the installation plate through an installation opening. The display control terminal is electrically connected to two electric actuators, a servo electric cylinder, a contact pressure sensor, an infrared thermometer, and a displacement sensor.

[0012] The beneficial effects of this utility model are:

[0013] 1. By setting up components such as a sliding rod, a moving block, and an electric actuator, the extension and retraction of the electric actuator can drive the moving block to slide on the sliding rod, precisely adjusting the distance between the two support plates. This allows the device to adapt to hoops of different sizes and specifications without the need to change tooling fixtures, greatly improving the versatility and testing efficiency of the device. At the same time, the automated drive of the electric actuator replaces the traditional manual adjustment method, reducing human operation errors and ensuring the accuracy and consistency of the hoop clamping position.

[0014] 2. By setting up components such as a prismatic rod, a slider, and a spring, when the hoop is deformed under stress, it drives the support plate to make the slider slide on the prismatic rod and squeeze the spring. The elastic reaction force generated by the spring is fed back to the hoop through the slider and the support plate, forming a dynamic stress circulation system. This system can not only simulate the alternating stress that the hoop bears in actual work, but also indirectly reflect the change in the elastic performance of the hoop through the degree of spring deformation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a hoop elastic fatigue testing device proposed in this utility model;

[0016] Figure 2 for Figure 1 A schematic diagram of the vertical section structure;

[0017] Figure 3 This is a side view of the elastic fatigue testing device for a hoop proposed in this utility model;

[0018] Figure 4 for Figure 2 Enlarged schematic diagram of the structure at point A in the diagram;

[0019] Figure 5 for Figure 3 Enlarged schematic diagram of the structure at point B in the diagram.

[0020] In the diagram: 1. Control panel, 2. Fixed plate, 3. Slide rod, 4. Moving block, 5. Electric actuator, 6. Connecting plate, 7. Prism rod, 8. Slider, 9. Spring, 10. Support plate, 11. Fixing bolt, 12. Support frame, 13. Mounting frame, 14. Servo electric cylinder, 15. Moving plate, 16. Contact pressure sensor, 17. Connecting plate, 18. Infrared thermometer, 19. Stabilizer, 20. Displacement sensor, 21. Mounting plate, 22. Display and control terminal. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Reference Figure 1-5 A tension band elastic fatigue testing device includes an operating table 1. Two sliding rods 3 are fixedly mounted on the upper surface of the operating table 1 via two fixing plates 2. Two movable blocks 4 are slidably mounted on the outer walls of the two sliding rods 3. Electric actuators 5 are fixedly mounted on the inner walls of both fixing plates 2. The telescopic ends of the two electric actuators 5 are respectively fixedly connected to the outer walls of the movable blocks 4 on the same side. Connecting plates 6 are fixedly mounted on the upper surfaces of both movable blocks 4. Prism-shaped rods 7 are fixedly mounted on the upper surfaces of both connecting plates 6 via sliding grooves. Sliding sliders 8 are slidably mounted on the outer walls of both prism-shaped rods 7. The outer walls of block 8 are connected to the inner walls of the moving groove on the same side through a reset mechanism. Support plates 10 are fixedly installed on the upper surfaces of the two sliders 8. Fixed openings are opened on the outer walls of the two support plates 10. Fixed bolts 11 are installed on the upper surfaces of the two support plates 10 through threaded rotation. An installation frame 13 is fixedly installed on the upper surface of the operating table 1 through a support frame 12. A moving plate 15 is fixedly connected inside the installation frame 13 through a lifting mechanism. A contact pressure sensor 16 is fixedly installed on the bottom wall of the moving plate 15. A displacement sensor 20 is fixedly installed on the upper surface of the operating table 1.

[0023] The reset mechanism includes a spring 9 installed on the outer wall of the prism rod 7, with both ends of the spring 9 elastically connected to the inner wall of the moving groove and the outer wall of the slider 8, respectively.

[0024] Furthermore, the spring 9 is made of high-strength alloy steel, which has a high elastic coefficient and fatigue resistance. It is not prone to plastic deformation during long-term use. When the clamp is deformed by force and the slider 8 slides, the spring 9 is squeezed and generates an elastic reaction force. This force is fed back to the clamp through the slider 8 and the support plate 10, forming a dynamic stress cycle. This not only simulates the alternating stress in the actual operation of the clamp, but also indirectly reflects the change in the elastic performance of the clamp through the degree of deformation of the spring 9.

[0025] The lifting mechanism includes a servo electric cylinder 14 fixedly installed inside the mounting frame 13. The upper surface of the support frame 12 has a telescopic opening that cooperates with the telescopic end of the servo electric cylinder 14. The telescopic end of the servo electric cylinder 14 is fixedly connected to the upper surface of the moving plate 15.

[0026] Furthermore, the servo electric cylinder 14 has high-precision position control and high response speed characteristics. Its speed control accuracy can reach ±0.5mm / s, and it can achieve loading frequency adjustment from 0.1 to 100Hz. By driving the moving plate 15 to move up and down through the servo electric cylinder 14, it can accurately control the pressure and loading frequency between the contact pressure sensor 16 and the clamp, so as to meet the loading requirements under different test conditions.

[0027] A connecting plate 17 is fixedly installed on the bottom wall of the movable plate 15, and an infrared thermometer 18 is fixedly installed on the outer wall of the connecting plate 17.

[0028] Furthermore, the infrared thermometer 18 adopts a non-contact measurement method with a temperature measurement range of -20℃ to 500℃ and an accuracy of ±1℃. It can monitor the temperature change of the tie surface in real time. During the tie fatigue test, the accumulation of internal damage to the material can lead to abnormal local temperature rise. The infrared thermometer 18 can capture the temperature change trend in a timely manner, providing temperature parameter support for analyzing the fatigue failure mechanism of the tie.

[0029] A stabilizing rod 19 is fixedly installed on the upper end face of the movable plate 15, and the stabilizing rod 19 slides through the support frame 12.

[0030] Furthermore, the stabilizer bar 19 and the support frame 12 are fitted with a precision linear bearing, which effectively reduces the swaying of the moving plate 15 during the lifting process, ensures that the contact pressure sensor 16 is in perpendicular contact with the tension band surface, and ensures the accuracy of pressure transmission. At the same time, the stabilizer bar 19 can also enhance the structural rigidity of the moving plate 15, maintain stability during high-frequency loading, and improve test accuracy.

[0031] An installation plate 21 is fixedly installed on the upper surface of the control panel 1. A display control terminal 22 is fixedly installed on the outer wall of the installation plate 21 through the installation opening. The display control terminal 22 is electrically connected to two electric push rods 5, a servo electric cylinder 14, a contact pressure sensor 16, an infrared thermometer 18, and a displacement sensor 20.

[0032] Furthermore, the display control terminal 22 adopts an industrial-grade touch screen, integrating data acquisition, analysis, and control functions. Operators can set test parameters (such as loading frequency, number of cycles, pressure threshold, etc.) through the terminal, view test data such as force, displacement, and temperature in real time, and generate visual curves and test reports. In addition, the terminal has a built-in intelligent algorithm that can automatically determine the fatigue state of the tension clamp based on sensor data. When preset conditions are reached (such as sudden displacement or temperature exceeding limits), it will automatically trigger shutdown protection to ensure test safety.

[0033] In use, the extension and retraction of the two electric actuators 5 can be adjusted according to the size of the clamp, driving the two moving blocks 4 to slide synchronously along the slide rod 3, precisely adjusting the distance between the two support plates 10 to accommodate clamps of different specifications (e.g., inner diameter φ10-φ100mm). The two ends of the clamp are placed inside the fixed openings on both sides, aligning the clamp's fixing holes with the fixing bolts 11. The fixing bolts 11 are then tightened so that their bottoms are embedded in the fixing holes, forming a rigid connection. This ensures that the clamp does not loosen or shift during testing. The clamp is then subjected to elastic fatigue testing. During testing, the servo electric cylinder 14 drives the moving plate 15 downward through the lifting opening, so that the contact pressure sensor 16 is tightly attached to the upper surface of the clamp and an initial preload (e.g., 50N) is applied to ensure stable pressure transmission during the test. At this time, the infrared thermometer 18 monitors the surface temperature of the clamp in real time (measurement accuracy ±0.5℃). Then, the servo electric cylinder 14 continues to reciprocate according to a preset program (e.g., at a frequency of 1Hz and an amplitude of ±2mm), so that the contact pressure sensor 16 periodically squeezes the clamp.

[0034] Meanwhile, the tension clamp undergoes elastic deformation under stress, causing the support plate 10 and slider 8 to slide along the prism rod 7. During this process, the spring 9 is compressed. The elastic reaction force generated by the compressed spring 9 is fed back to the tension clamp through the slider 8 and support plate 10, forming a dynamic stress cycle system. This elastic feedback mechanism not only simulates the alternating stress (such as pipe vibration and expansion and contraction caused by temperature changes) experienced by the tension clamp in the actual working environment, but also indirectly reflects the change in the elastic performance of the tension clamp through the degree of deformation of the spring 9. During the test, the displacement sensor 20 monitors the displacement generated by the deformation of the tension clamp in real time with an accuracy of 0.01mm. The displacement data under each stress cycle is transmitted to the display control terminal 22 at a frequency of 10kHz. Combined with the load data (accuracy ±0.1%FS) synchronously fed back by the contact pressure sensor 16, the system automatically plots the "load-displacement" hysteresis curve, which intuitively presents the mechanical characteristics of the tension clamp in the elastic deformation and plastic deformation stages. If the tension clamp suffers fatigue damage under cyclic loading, the area of ​​the hysteresis curve will gradually expand with the increase of the number of cycles, and the slope change reflects the decay trend of the material's elastic modulus, providing a key basis for fatigue life prediction.

[0035] After the test is completed, the servo electric cylinder 14 retracts upward to release the pressure on the clamp. During this process, the two compressed springs 9 recover their deformation by relying on elastic potential energy. Through the slider 8, the support plates 10 on both sides slide back along the prism rod 7 to reset. At the same time, the electric push rod 5 retracts synchronously, driving the moving block 4 to move towards each other on the slide rod 3, so that the clamping mechanism returns to the initial distance, which facilitates the removal of the clamp after the test. The display control terminal 22 automatically stops data acquisition and generates a complete test report based on the "load-displacement" hysteresis curve, temperature change data, etc., including fatigue life prediction, elastic modulus decay rate, and failure mode analysis.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A tension hoop elastic fatigue testing device, comprising an operating table (1), characterized in that, Two sliding rods (3) are fixedly installed on the upper surface of the operating table (1) via two fixing plates (2). Two moving blocks (4) are slidably installed on the outer walls of the two sliding rods (3). Electric push rods (5) are fixedly installed on the inner walls of the two fixing plates (2). The telescopic ends of the two electric push rods (5) are respectively fixedly connected to the outer walls of the moving blocks (4) on the same side. Connecting plates (6) are fixedly installed on the upper surfaces of the two moving blocks (4). Prism-shaped rods (7) are fixedly installed on the upper surfaces of the two connecting plates (6) via moving grooves. Sliding sliders (8) are slidably installed on the outer walls of the two prism-shaped rods (7). The outer walls of the two sliding sliders (8) are connected via... The positioning mechanism is connected to the inner wall of the moving groove on the same side. Support plates (10) are fixedly installed on the upper surfaces of the two sliders (8). Fixed openings are opened on the outer walls of the two support plates (10). Fixed bolts (11) are installed on the upper surfaces of the two support plates (10) by thread rotation. An installation frame (13) is fixedly installed on the upper surface of the operating table (1) by a support frame (12). A moving plate (15) is fixedly connected inside the installation frame (13) by a lifting mechanism. A contact pressure sensor (16) is fixedly installed on the bottom wall of the moving plate (15). A displacement sensor (20) is fixedly installed on the upper surface of the operating table (1).

2. The elastic fatigue testing device for a hoop according to claim 1, characterized in that, The reset mechanism includes a spring (9) installed on the outer wall of the prism rod (7), and the two ends of the spring (9) are elastically connected to the inner wall of the moving groove and the outer wall of the slider (8), respectively.

3. The elastic fatigue testing device for a hoop according to claim 2, characterized in that, The lifting mechanism includes a servo electric cylinder (14) fixedly installed inside the mounting frame (13). The upper surface of the support frame (12) is provided with a telescopic opening that cooperates with the telescopic end of the servo electric cylinder (14). The telescopic end of the servo electric cylinder (14) is fixedly connected to the upper surface of the moving plate (15).

4. A hoop pull elastic fatigue testing device according to claim 3, wherein A connecting plate (17) is fixedly installed on the bottom wall of the movable plate (15), and an infrared thermometer (18) is fixedly installed on the outer wall of the connecting plate (17).

5. A hoop-iron elastic fatigue testing device according to claim 4, wherein A stabilizing rod (19) is fixedly installed on the upper surface of the movable plate (15), and the stabilizing rod (19) slides through the support frame (12).

6. The elastic fatigue testing device for a hoop according to claim 5, characterized in that, An installation plate (21) is fixedly installed on the upper surface of the operating table (1). A display control terminal (22) is fixedly installed on the outer wall of the installation plate (21) through an installation opening. The display control terminal (22) is electrically connected to two electric push rods (5), a servo electric cylinder (14), a contact pressure sensor (16), an infrared thermometer (18), and a displacement sensor (20).

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