Steel wire rope power impact testing device and testing method thereof

Abstract

This invention relates to a dynamic impact testing device and method for steel wire ropes. The device includes a truss, a steel frame, a steel wire rope, a fixing component, a hanging beam, a lifting motor, and a drop hammer. The steel wire rope is located on both sides of the top of the steel frame, with the fixing component and hanging beam located at both ends of the steel frame. One end of the steel wire rope is fixed to the ground by the fixing component, and the other end is connected to the hanging beam. The middle of the steel wire rope is supported on the top of the steel frame by an angle adjustment mechanism. The angle adjustment mechanism includes a vertical support, a lifting mechanism, a horizontal support, and a pulley. The steel wire rope is wound around the pulley, and the groove surface of the pulley has a friction layer. The drop hammer is lifted by the lifting motor and suspended directly above the middle of the hanging beam. The advantages of this invention are: it solves the defects of the existing steel wire rope testing system, which has a single loading mode and limited testing performance; by simulating real dynamic impact conditions, it prevents premature failure of the steel wire rope under impact load, thereby improving the accuracy of testing and evaluation.

Description

Technical Field

[0001] This invention relates to the field of engineering material testing technology, specifically to a wire rope dynamic impact testing device and its testing method. Background Technology

[0002] As a key load-bearing component in engineering machinery systems, steel wire rope is widely used in lifting, hoisting, and interception scenarios in modern engineering fields due to its high strength, toughness, impact resistance, and flexible force transmission characteristics. In the field of flexible protection, steel wire rope is woven in a certain way to serve as a high-energy interception mesh to intercept falling rocks. The interception mesh must withstand the dynamic impact of falling rocks, debris flows, etc. During service, the steel wire rope not only bears instantaneous high dynamic loads, but also undergoes multi-directional bending deformation due to impacts, and experiences severe friction with adjacent ropes or rock and soil media. Its dynamic impact performance is directly related to the reliability of the project.

[0003] Current wire rope performance testing systems rely on a single loading mode, primarily employing static axial tension or single bending fatigue tests. These tests involve fixed-point winding and tensioning of the wire rope, resulting in a fixed tensile profile and neglecting the accelerating effect of friction on wear and failure. Existing testing equipment considering wire rope performance under bending conditions only evaluates performance under static tension. However, existing research and engineering disassembly analyses indicate that as the rope bending angle increases, wear in the contact area between the rope and clamps or adjacent ropes also intensifies, demonstrating the interaction between bending angle and friction. The current wire rope testing and evaluation system lacks testing methods that consider the multi-field coupling effects of dynamic impact, bending, and friction on pre-tensioned wire ropes, leading to discrepancies between laboratory data and actual engineering performance, and failing to meet the engineering requirements of flexible protection fields. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a wire rope dynamic impact testing device and its testing method. This invention solves the defects of the existing wire rope testing system, such as the single loading mode and limited testing performance. By simulating real dynamic impact conditions, it prevents the wire rope from failing prematurely under impact load, thereby improving the accuracy of testing and evaluation.

[0005] The objective of this invention is achieved through the following technical solution: A wire rope dynamic impact testing device includes a truss, a steel frame, wire ropes, fixing components, a hanging beam, a lifting motor, and a drop hammer. The steel frame is located below the truss, and the wire ropes are located on both sides of the top of the steel frame, with two wire ropes arranged in parallel. The fixing components and the hanging beam are located at both ends of the steel frame. One end of the wire rope is fixed to the ground by the fixing components, and the other end of the wire rope is connected to the hanging beam. The middle part of the wire rope is supported on the top of the steel frame by an angle adjustment mechanism. The hanging beam is horizontally suspended from the steel frame by the two wire ropes. The angle adjustment mechanism includes... It includes vertical supports, a lifting mechanism, horizontal supports, and pulleys. The lifting mechanism is located at the center of the top of the steel frame. The vertical supports are fixed at both ends of the top of the steel frame and are symmetrically arranged about the lifting mechanism. The horizontal supports are fixed on the steel frame at one end near the hanging beam. The vertical supports, the lifting mechanism, and the horizontal supports are all detachably equipped with pulleys. The steel wire rope is wound around the pulleys, and the groove surface of the pulleys is provided with a friction layer. The lifting motor is located at the top of the truss, and the drop hammer is lifted by the lifting motor and suspended directly above the middle of the hanging beam.

[0006] Furthermore, the friction layer is made of rubber, polyurethane, or polytetrafluoroethylene.

[0007] Furthermore, the lifting mechanism includes a lifting cylinder and a lifting seat. The lifting cylinder is located at the center of the top of the steel frame, and the lifting seat is located on the telescopic end of the lifting cylinder. The lifting seat is equipped with pulleys.

[0008] Furthermore, the present invention also provides a testing method based on the above-mentioned wire rope dynamic impact testing device, comprising the following steps: S1. Set the bending angle of the wire rope and calculate the target lifting height of the wire rope based on the bending angle; S2. Set the impact kinetic energy when the hammer falls and calculate the target lifting height of the hammer based on the impact kinetic energy; S3. The steel wire rope is lifted to the target lifting height by driving the pulley through the lifting mechanism, and the drop hammer is lifted to the target lifting height by the lifting motor. S4. Apply a load to the hanging beam, then release the drop hammer to allow it to fall freely and impact the hanging beam.

[0009] S5. Following steps S1-S4, by changing the applied load, the lifting height of the wire rope, and the material of the friction layer, the dynamic impact performance of the wire rope under different pretension, bending angle, and friction conditions is studied.

[0010] Further, in step S1, according to the formula Calculate the target lifting height of the wire rope In the formula The bending angle of the wire rope; The distance between the two vertical supports is expressed in meters (m).

[0011] Further, in step S2, according to the formula Calculate the target lifting height of the falling hammer In the formula The impact kinetic energy of the falling hammer, expressed in J; The mass of the falling weight is expressed in kg. The acceleration due to gravity is taken as 9.8 m / s². 2 ; The unit is the suspension height of the beam, expressed in meters (m).

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention, through the arrangement of trusses, steel frames, wire ropes, hanging beams, lifting motors, drop hammers, angle adjustment mechanisms, and friction layers, can study the dynamic impact performance of wire ropes under different pretension, bending angles, and friction conditions. Compared with existing wire rope testing systems, the simulated working conditions are more consistent with the actual stress situation of wire ropes under dynamic impact on intercepting nets, resulting in higher accuracy in testing and evaluation. This invention also solves the shortcomings of existing wire rope testing systems, such as a single loading mode and limited testing performance.

[0013] 2. The testing device of the present invention has a simple overall structure and is easy to assemble. It is suitable for testing the performance of wire ropes in various engineering fields and can guide the design of related products such as protective nets and cranes. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the installation of the wire rope in this invention; Figure 3 This is a schematic diagram of the bending state of the wire rope in this invention; Figure 4 This is a schematic diagram of the pulley structure in this invention; Figure 5 This is a schematic diagram of the lifting mechanism in this invention.

[0015] In the diagram: 1. Truss; 2. Steel frame; 3. Steel wire rope; 4. Hanging beam; 5. Lifting motor; 6. Drop hammer; 7. Vertical support; 8. Lifting mechanism; 81. Lifting cylinder; 82. Lifting seat; 9. Horizontal support; 10. Pulley; 11. Friction layer; 12. Fixing component. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0017] like Figures 1-2As shown, a power impact testing device for a steel wire rope 3 includes a truss 1, a steel frame 2, a steel wire rope 3, a fixing component 12, a hanging beam 4, a lifting motor 5, and a drop hammer 6. The steel frame 2 is located below the truss 1. The steel wire rope 3 is located on both sides of the top of the steel frame 2, with two steel wire ropes 3 arranged in parallel. The fixing component 12 and the hanging beam 4 are respectively located at both ends of the steel frame 2. One end of the steel wire rope 3 is fixed to the ground by the fixing component 12, and the other end of the steel wire rope 3 is fixedly connected to the hanging beam 4. The middle part of the steel wire rope 3 is supported on the top of the steel frame 2 by a bending angle adjustment mechanism, so that the hanging beam 4 is horizontally suspended on the steel frame 2 by the two steel wire ropes 3. The lifting motor 5 is installed on the top of the truss 1, and the drop hammer 6 is lifted by the lifting motor 5 and suspended directly above the middle part of the hanging beam 4.

[0018] During testing, the fixing component 12 can be anchored to the ground using components such as lifting rings. Then, the wire rope 3 is fixedly connected to the fixing component 12. After the wire rope 3 and the hanging beam 4 are installed in place, a load can be added to the hanging beam 4 to apply pretension to the wire rope 3. Then, the drop hammer 6 is lifted to a certain height by the lifting motor 5 and released, causing the drop hammer 6 to fall and impact the hanging beam 4. The impact kinetic energy of the drop hammer 6 when it falls is then transferred to the wire rope 3 through the hanging beam 4.

[0019] like Figure 1 , Figure 2 , Figure 4 , Figure 5 As shown, the angle adjustment structure includes a vertical support 7, a lifting mechanism 8, a horizontal support 9, and a pulley 10. The lifting mechanism 8 is installed at the top center of the steel frame 2. The vertical supports 7 are fixed at both ends of the top of the steel frame 2, and the two vertical supports 7 are symmetrically arranged about the lifting mechanism 8. The horizontal support 9 is fixed on the steel frame 2 at one end near the hanging beam 4. The lifting mechanism 8 includes a lifting cylinder 81 and a lifting seat 82. The lifting cylinder 81 is installed at the top center of the steel frame 2, and the lifting seat 82 is fixed on the telescopic end of the lifting cylinder 81. Pulleys 10 are detachably installed on the vertical support 7, the lifting seat 82, and the horizontal support 9. The groove surface of the pulley 10 is provided with a friction layer 11. The wire rope 3 is fixed by the fixing member 12, and then the wire rope 3 is wound around the pulley 10. Finally, the hanging beam 4 is connected, so that the hanging beam 4 is suspended on the steel frame 2. When the drop hammer 6 impacts the hanging beam 4, it causes the wire rope 3 to slide at a low speed relative to the pulley 10.

[0020] During the test, the pretension of the wire rope 3 before the test can be changed by altering the load applied to the hanging beam 4. The lifting cylinder 81 in the lifting mechanism 8 drives the lifting seat 81 to rise and fall, which in turn drives the pulley 10 to lift the wire rope 3 to different heights, causing the wire rope 3 between the two vertical supports 7 to bend, thus changing the bending angle of the wire rope 3 between the two vertical supports 7. Different pulleys 10 have different friction layer 11 materials, including rubber, polyurethane, and polytetrafluoroethylene, each with a different coefficient of friction. By installing different pulleys 10 and changing the friction layer 11, the sliding friction force between the wire rope 3 and the pulley 10 when impacted can be altered. By changing the applied load, the bending angle of the wire rope 3, and the material of the friction layer 11, the dynamic impact performance of the wire rope 3 under different pretensions, bending angles, and friction conditions can be studied.

[0021] When testing the dynamic impact performance of a wire rope using the aforementioned wire rope dynamic impact testing device, the following steps S1-S4 are included: S1. Set the bending angle of the wire rope 3 and calculate the target lifting height of the wire rope 3 based on the bending angle.

[0022] Specifically, such as Figure 3 As shown, The bending angle of wire rope 3; The distance between the two vertical supports 7, in meters; The target lifting height of wire rope 3 is in meters (m). Therefore, it can be determined according to the formula. The target lifting height of wire rope 3 was calculated. .

[0023] S2. Set the impact kinetic energy of the falling hammer 6 and calculate the target lifting height of the falling hammer 6 based on the impact kinetic energy.

[0024] Specifically, let's set The impact kinetic energy of the drop hammer 6 during its fall is expressed in J. The mass of the falling weight 6 is expressed in kg. The acceleration due to gravity is taken as 9.8 m / s². 2 ; The unit is the suspension height of beam 4, in meters (m). Therefore, it can be determined according to the formula. The target lifting height of the falling hammer 3 was calculated. , S3. The steel wire rope 3 is lifted to the target lifting height by driving the pulley 10 through the lifting mechanism, and the drop hammer 6 is lifted to the target lifting height by the lifting motor 5. S4. Apply a load to the hanging beam 4, and then release the drop hammer 6 so that it falls freely and impacts the hanging beam 4.

[0025] S5. Following steps S1-S4, by changing the magnitude of the applied load, the lifting height of the wire rope 3, and the material of the friction layer 11, the dynamic impact performance of the wire rope 3 under different pretension, different bending angles, and different friction conditions is studied.

[0026] Based on the aforementioned wire rope dynamic impact testing device and corresponding testing method, this invention conducted on-site performance tests on wire rope 3 at an impact kinetic energy level of 800KJ, specifically testing the wire rope performance under bending angles of 120°, 135°, and 150°. The drop hammer 3 had a mass of 6t, and the friction layer 11 was made of rubber, polyurethane, and polytetrafluoroethylene (PTFE), with friction coefficients of 0.8, 0.5, and 0.1 for rubber, polyurethane, and PTFE, respectively. The distance between the two vertical supports 7 was 5m. According to the formula... The calculated target lifting heights of wire rope 3 under bending angles of 120°, 135°, and 150° are 2.88m, 2.07m, and 1.34m, respectively. According to the formula... The calculated target lift height of the falling hammer 3 is as follows: .

[0027] The testing device and corresponding testing method of this invention can be used to test the performance of pre-tensioned wire ropes under dynamic coupling of bending and friction after dynamic impact. By adjusting the lifting height of the wire rope and the friction layer material on the pulley, the dynamic impact resistance performance of the wire rope under different bending angles and different friction conditions can be tested. Finally, through more realistic working condition simulation, premature failure of the wire rope under impact load can be prevented, thereby improving the accuracy of test evaluation and solving the defects of the existing wire rope testing system, such as single loading mode and limited testing performance.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wire rope dynamic impact testing device, characterized in that: The system includes a truss (1), a steel frame (2), wire ropes (3), fasteners (12), a hanging beam (4), a lifting motor (5), and a drop hammer (6). The steel frame (2) is located below the truss (1). The wire ropes (3) are located on both sides of the top of the steel frame (2) and the two wire ropes (3) are arranged in parallel. The fasteners (12) and the hanging beam (4) are located at both ends of the steel frame (2). One end of the wire rope (3) is fixed to the ground by the fasteners (12), and the other end of the wire rope (3) is connected to the hanging beam (4). The middle part of the wire rope (3) is supported on the top of the steel frame (2) by a bending angle adjustment mechanism. The hanging beam (4) is horizontally suspended on the steel frame (2) by two wire ropes (3). The bending angle adjustment structure includes a vertical support (7) and a lifting mechanism. The mechanism (8), the horizontal support (9), and the pulley (10) are arranged. The lifting mechanism (8) is located at the top center of the steel frame (2). The vertical support (7) is fixed at both ends of the top of the steel frame (2) and the two vertical supports (7) are symmetrically arranged about the lifting mechanism (8). The horizontal support (9) is fixed on one end of the steel frame (2) near the hanging beam (4). The vertical support (7), the lifting mechanism (8), and the horizontal support (9) are all equipped with pulleys (10). The wire rope (3) is wound around the pulley (10). The groove surface of the pulley (10) is provided with a friction layer (11). The lifting motor (5) is located at the top of the truss (1). The drop hammer (6) is lifted by the lifting motor (5) and suspended directly above the middle of the hanging beam (4).

2. The wire rope dynamic impact testing device according to claim 1, characterized in that: The friction layer (11) is made of rubber, polyurethane or polytetrafluoroethylene.

3. The wire rope dynamic impact testing device according to claim 1, characterized in that: The lifting mechanism (8) includes a lifting cylinder (81) and a lifting seat (82). The lifting cylinder (81) is located at the top center of the steel frame (2), and the lifting seat (82) is located on the telescopic end of the lifting cylinder (81). The lifting seat (82) is equipped with pulleys (10).

4. A test method for the wire rope dynamic impact testing device as described in claim 1, characterized in that, Includes the following steps: S1. Set the bending angle of the wire rope (3) and calculate the target lifting height of the wire rope (3) based on the bending angle; S2. Set the impact kinetic energy of the falling hammer (6) and calculate the target lifting height of the falling hammer (6) based on the impact kinetic energy; S3. The steel wire rope (3) is lifted to the target lifting height by the pulley (10) driven by the lifting mechanism (8), and the drop hammer (6) is lifted to the target lifting height by the lifting motor (5); S4. Add a load to the hanging beam (4), and then release the drop hammer (6) so that the drop hammer (6) falls freely and impacts the hanging beam (4). S5. Following steps S1-S4, by changing the magnitude of the applied load, the lifting height of the wire rope (3), and the material of the friction layer (11), the dynamic impact performance of the wire rope (3) under different pretension, different bending angles, and different friction conditions is studied.

5. The test method of the wire rope dynamic impact testing device according to claim 4, characterized in that: In step S1, according to the formula Calculate the target lifting height of the wire rope (3) In the formula The bending angle of the wire rope (3); The distance between the two vertical supports (7) is in meters.

6. The test method of the wire rope dynamic impact testing device according to claim 4, characterized in that: In step S2, according to the formula Calculate the target lifting height of the falling hammer (6) In the formula The impact kinetic energy of the falling hammer (6) is expressed in J. The mass of the falling hammer (6) is expressed in kg. The acceleration due to gravity is taken as 9.8 m / s². 2 ; The suspension height of the hanging beam (4) is in meters.

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