Bridge steel cable fatigue test device

Abstract

The utility model discloses a bridge steel cable fatigue test device, which comprises a shell, two symmetrically distributed placement seats are fixedly arranged on the lower surface in the shell, and a plurality of through semicircular placement grooves are formed in the upper surfaces of the placement seats; the two side surfaces in the shell are elastically connected with circular rings through springs, and the two ends of the springs are fixedly connected with the side wall of the shell and the circular rings respectively; a first hydraulic cylinder is arranged at the top of the placement seat, the lower end of the first hydraulic cylinder is connected with a moving plate through an arranged first piston rod, and the lower surface of the moving plate is connected with pressing blocks corresponding to the semicircular placement grooves through a plurality of supporting rods; a transmission mechanism with a sliding groove is arranged at the bottom of the shell, a movable bottom plate is slidably connected into the sliding groove, and a second hydraulic cylinder is arranged on the upper surface of the movable bottom plate and connected with an impact block through a second piston rod. According to the utility model, synchronous clamping and fatigue testing of a plurality of steel cables can be realized, the operation is convenient, and the testing efficiency is greatly improved.

Description

Technical Field

[0001] This utility model relates to the technical field of bridge cable testing equipment, specifically a bridge cable fatigue testing device. Background Technology

[0002] The fatigue performance of bridge cables is a crucial indicator for ensuring the safety and durability of bridge structures. Fatigue tests aim to evaluate the performance of cables under long-term alternating loads to ensure they meet design life requirements.

[0003] Currently, testing the fatigue of bridge cables requires impacts at various frequencies under different forces. Therefore, multiple cables need to be tested separately, and the process of installing and fixing the cables repeatedly is cumbersome, reducing testing efficiency. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model discloses a bridge cable fatigue testing device to solve the problems of cumbersome and inefficient existing cable fatigue testing processes.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a bridge cable fatigue testing device, comprising a housing, wherein two symmetrically distributed mounting seats are fixedly arranged on the lower surface of the housing, and multiple through-type semi-circular placement grooves are provided on the upper surface of the mounting seats; the inner two sides of the housing are elastically connected to rings by springs, and the two ends of the springs are respectively fixedly connected to the side wall of the housing and the rings; a first hydraulic cylinder is provided at the top of the mounting seats, and a moving plate is connected to the lower end of the first hydraulic cylinder by a first piston rod, and a pressure block corresponding to the position of the semi-circular placement groove is connected to the lower surface of the moving plate by multiple support rods; a transmission mechanism with a sliding groove is provided at the bottom of the housing, and a moving base plate is slidably connected in the sliding groove, and a second hydraulic cylinder is provided on the upper surface of the moving base plate, and the second hydraulic cylinder is connected to the impact block by a second piston rod.

[0006] Preferably, the transmission mechanism includes a servo motor, a drive gear, a rotating shaft, a transmission chain, a driven gear, and a fixed shaft. A groove is provided at the bottom of the housing. The servo motor is fixedly connected to the groove on the lower inner surface of the housing. The servo motor is controlled according to a predetermined program to rotate sequentially by a certain angle. The rotating shaft is fixedly connected to the output end of the servo motor. The drive gear is fixedly connected to the cylindrical surface of the rotating shaft. The fixed shaft is fixedly connected to the lower inner surface of the housing. The driven gear is rotatably connected to the cylindrical surface of the fixed shaft and, through the provided transmission chain, cooperates with the drive gear and the driven gear for transmission. The transmission chain is fixedly connected to the movable base plate.

[0007] Preferably, the bottom of the pressure block is provided with a concave curved surface adapted to the surface of the steel cable, and the curvature of the concave curved surface matches the curvature of the semi-circular placement groove of the mounting seat.

[0008] Preferably, the outer wall of the shell is fixedly provided with a placement frame for storing the experimental record book, and the placement frame is a box structure with an open top.

[0009] Preferably, the spring is a pre-tensioned high-strength spring, and a steel cable fixing groove is provided at the connection between the ring and the spring, so that the spring remains under tension after the steel cable is installed.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] 1. This utility model can improve testing efficiency, enabling simultaneous testing of multiple steel cables and combining automated impact positioning. It can realize the simultaneous clamping and fatigue testing of multiple steel cables, greatly improving testing efficiency, and is especially suitable for batch steel cable performance comparison and analysis.

[0012] 2. This utility model ensures uniform load distribution, controllable impact position, and smaller data errors during testing by precisely matching the curved surface of the pressure block with the placement groove, the spring preload compensation mechanism, and the servo positioning system.

[0013] 3. This utility model is more convenient to operate. Through the programmed servo control of the transmission chain, the moving base plate is precisely positioned laterally. With the adjustable impact parameters of the second hydraulic cylinder, impact loads of set frequency and intensity can be applied to different positions of the steel cable to accurately simulate complex working conditions such as bridge vibration and wind load, which greatly reduces the intensity of manual intervention and shortens the testing time. Attached Figure Description

[0014] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0015] In the attached diagram:

[0016] Figure 1 This is a schematic diagram of the overall structure of the bridge cable fatigue testing device of this utility model;

[0017] Figure 2 This is a schematic diagram of the internal mechanism on one side of the housing of this utility model;

[0018] Figure 3 This is a schematic diagram of the installation position of the transmission mechanism of this utility model;

[0019] Figure 4 This is a utility model Figure 1 Enlarged schematic diagram of a local structure at point A;

[0020] Figure 5 This is a utility model Figure 2 Enlarged schematic diagram of the local structure at point B.

[0021] The following are the labeling elements in the diagram: 1. Housing; 2. Transmission mechanism; 201. Servo motor; 202. Drive gear; 203. Rotating shaft; 204. Transmission chain; 205. Driven gear; 206. Fixed shaft; 3. First hydraulic cylinder; 4. Placement frame; 5. First piston rod; 6. Mounting seat; 7. Second hydraulic cylinder; 8. Moving plate; 9. Support rod; 10. Pressure block; 11. Spring; 12. Ring; 13. Moving base plate; 14. Second piston rod; 15. Impact block. Detailed Implementation

[0022] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0023] Example: Figures 1-5As shown, a bridge cable fatigue testing device includes a housing 1, which forms the main frame of the device. A storage frame 4 for storing experimental record books is fixed to the outer wall of the housing 1. The storage frame 4 is a box structure with an open top. Two symmetrically distributed mounting seats 6 are fixed to the lower inner surface of the housing 1, forming cable positioning bases. Multiple through-type semi-circular placement slots are provided on the upper surface of the mounting seats 6. These through-type placement slots allow the two ends of the cable to extend freely, facilitating connection with the tension mechanism of the ring 12, and supporting the simultaneous fixing and testing of multiple cables, significantly improving experimental efficiency. The inner two sides of the housing 1 are elastically connected to the ring 12 via springs 11. The two ends of the springs 11 are fixedly connected to the side wall of the housing 1 and the ring 12, respectively. The springs 11 are used to fix the two ends of the cable and apply a constant tension. The springs 11 are pre-tensioned high-strength springs. A cable fixing slot is provided at the connection between the ring 12 and the spring 11, ensuring that the spring 11 remains under tension after the cable is installed. The mounting base 6 is equipped with a first hydraulic cylinder 3 at its top. The lower end of the first hydraulic cylinder 3 is connected to a moving plate 8 via a first piston rod 5. The lower surface of the moving plate 8 is connected to a pressure block 10 corresponding to the position of the semi-circular placement groove via multiple support rods 9. The bottom of the pressure block 10 is provided with a concave curved surface adapted to the surface of the steel cable. The curvature of the concave curved surface matches the curvature of the semi-circular placement groove of the mounting base 6 to ensure uniform pressure on the steel cable and avoid local stress concentration that could lead to distorted test data. The bottom of the housing 1 is equipped with a transmission mechanism 2 with a sliding groove. A moving base plate 13 is slidably connected in the sliding groove. A second hydraulic cylinder 7 is provided on the upper surface of the moving base plate 13. The second hydraulic cylinder 7 is connected to an impact block 15 via a second piston rod 14. The second hydraulic cylinder 7 can adjust the impact force and frequency to meet diverse testing needs. The transmission mechanism 2 drives the moving base plate 13 and the second hydraulic cylinder 7 to move laterally, so that the impact block 15 can accurately impact different positions of the steel cable, allowing for multi-point impact testing of different positions of the steel cable.

[0024] Among them, such as Figure 3 As shown, the transmission mechanism 2 includes a servo motor 201, a drive gear 202, a rotating shaft 203, a transmission chain 204, a driven gear 205, and a fixed shaft 206. The bottom of the housing 1 is provided with a groove. The servo motor 201 is fixedly connected to the groove provided on the lower inner surface of the housing 1. The servo motor 201 is controlled according to a predetermined program to rotate a certain angle in sequence. The rotating shaft 203 is fixedly connected to the output end of the servo motor 201. The drive gear 202 is fixedly connected to the cylindrical surface of the rotating shaft 203. The fixed shaft 206 is fixedly connected to the lower inner surface of the housing 1. The driven gear 205 is rotatably connected to the cylindrical surface of the fixed shaft 206 and is driven by the drive chain 204, which cooperates with the drive gear 202 and the driven gear 205 for transmission. The transmission chain 204 is fixedly connected to the movable base plate 13.

[0025] Working principle: In use, multiple steel cables to be tested are placed in the semi-circular placement groove on the upper surface of the mounting base 6, and the two ends of the steel cables are wrapped around the rings 12 on both sides. During the winding process, the spring 11 is kept in a tensile state. After winding, the steel cables are taut under the pull of the spring 11. Then, the first hydraulic cylinder 3 moves the pressure block 10 down to press and fix the steel cables in the semi-circular placement groove on the upper surface of the mounting base 6. Then, the servo motor 201 drives the drive gear 202 to rotate at a certain angle, thereby driving the second hydraulic cylinder 7 to move under the appropriate steel cable through the transmission chain 204. Then, the second hydraulic cylinder 7 drives the impact block 15 to impact the steel cable with a certain force, number of times and frequency. After all the steel cables have been tested, all components are reset, the condition of each steel cable is checked and the data is recorded.

[0026] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A bridge cable fatigue testing apparatus, characterized by: Including the shell, the shell inside lower surface is fixedly provided with two symmetrical arrangement seat, the upper surface of the arrangement seat is equipped with a plurality of through semi-circular placement groove, the both sides surface of the shell inside is elastically connected with the circular ring through the spring, the both ends of the spring are fixedly connected with the shell side wall and the circular ring, the top of the arrangement seat is equipped with the first hydraulic cylinder, the lower end of the first hydraulic cylinder is connected with the moving plate through the first piston rod, the lower surface of the moving plate is connected with the pressing block corresponding with the position of the semi-circular placement groove through a plurality of support bars, the bottom of the shell is equipped with the transmission mechanism with the sliding slot, the sliding slot is slidably connected with the moving bottom plate, the upper surface of the moving bottom plate is equipped with the second hydraulic cylinder, the second hydraulic cylinder is connected with the impact block through the second piston rod.

2. The bridge cable fatigue testing device of claim 1, wherein: The transmission mechanism includes a servo motor, a driving gear, a rotating shaft, a transmission chain, a driven gear and a fixed shaft, the bottom of the shell is provided with a groove, the servo motor is fixedly connected in the groove provided on the lower surface of the shell, the rotating shaft is fixedly connected to the output end of the servo motor, the driving gear is fixedly connected to the cylindrical surface of the rotating shaft, the fixed shaft is fixedly connected to the lower surface of the shell, the driven gear is rotatably connected to the cylindrical surface of the fixed shaft, and the transmission chain is provided, which cooperates with the driving gear and the driven gear to drive each other, and the transmission chain is fixedly connected with the moving bottom plate.

3. The bridge cable fatigue testing device of claim 1, wherein: The bottom of the pressing block is provided with a concave curved surface matched with the surface of the steel cable, and the curvature of the concave curved surface is matched with the curvature of the semi-circular placement groove of the arrangement seat.

4. The bridge cable fatigue test apparatus of claim 1, wherein: The outside wall of the shell is fixedly provided with a placement frame for storing experiment record manual, and the placement frame is a box body structure with an open top.

5. The bridge cable fatigue testing apparatus of claim 1, wherein: The spring is a pre-tightening type strong spring, the circular ring is provided with a steel cable fixing slot at the connection position with the spring, and the spring remains in a tension state after the steel cable is installed.

Images