A vibration fatigue testing device for elastic suspension cables of overhead contact lines

Abstract

This invention discloses a vibration fatigue testing device for catenary elastic suspenders, belonging to the technical field of elastic suspender testing devices. It includes a frame, a support cable, an elastic suspender, a drive system, and a buffer system. This catenary elastic suspender vibration fatigue testing device conducts tests on the entire elastic suspender device. The test objects include elastic suspender clamps and elastic suspender lines. During the test, the displacement, speed, and acceleration of the actuating cylinder are controlled to regulate parameters such as displacement, tension, and the angle with the support cable. A downward drive method is used to effectively simulate the actual vibration fatigue process of the elastic suspender. The test method and device are simple to operate, feature closed-loop control, high control precision, and good test stability, effectively evaluating the performance and lifespan of the elastic suspender.

Description

Technical Field

[0001] This invention relates to the field of elastic cable testing equipment, and in particular to a vibration fatigue testing device for elastic cables of overhead contact lines. Background Technology

[0002] Elastic suspenders are an important component of the overhead contact system in electrified railways. Both ends are attached to the catenary cable via elastic suspender clamps. They act as an elastic buffer when a train passes, improving the elasticity and uniformity of the contact system. In actual service, the elastic suspenders are clamped to the catenary cable by the elastic suspender clamps and bear internal tensile loads. When a train passes, the elastic suspenders are lifted upwards; after the train passes, the elastic suspenders droop and vibrate up and down.

[0003] Currently, the elastic sling test is mainly conducted according to "TB / T 2074-2020 Test Methods for Contact Network Components of Electrified Railway" and "TB / T 2075.8-2020 Contact Network Components of Electrified Railway Part 8: Elastic Sling Device". The test mainly focuses on the clamps of the elastic sling. The vibration test uses constant amplitude vibration, which only controls the lifting displacement of the contact network, but does not effectively control the load, movement displacement, angle, etc. of the elastic sling device. This results in a significant difference from the actual service conditions of the elastic sling in the field, and the vibration test cannot truly reflect the actual service conditions of the elastic sling device.

[0004] Currently, existing tests on elastic slings mainly focus on the elastic sling clamps, which are installed in a simulated vibration field to control the displacement and frequency of the contact wire. However, an actual elastic sling is a complete device, including the elastic sling clamps and the elastic sling wire. Furthermore, the displacement, load, and angle between the elastic sling device and the catenary cable all change during service. Existing test methods only test the clamps and the parameters differ from those under actual working conditions, making it impossible to effectively assess the service conditions and performance of the entire elastic sling device. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a vibration fatigue testing device for contact wire elastic suspension cables, which aims to simulate the actual vibration fatigue process of elastic suspension cables.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] This invention provides a vibration fatigue testing device for an elastic suspension cable of a contact network, comprising a frame, a support cable, an elastic suspension cable, a drive system, and a buffer system. The two ends of the support cable are respectively connected to both sides of the frame. One end of the elastic suspension cable is connected to one side of the frame, and the other end of the elastic suspension cable is connected to the support cable. A first force-measuring mechanism is provided between one end of the support cable and the frame, and a second force-measuring mechanism is provided between one end of the elastic suspension cable and the frame. The buffer mechanism is also provided between the second force-measuring mechanism and the frame. The drive system is mounted on the frame, and the free end of the drive system is connected to the elastic suspension cable. A third force-measuring mechanism is provided between the free end of the drive system and the elastic suspension cable.

[0008] Optionally, the buffer system includes a helical spring, one end of which is connected to one end of the elastic sling, and the other end of which is connected to one end of the second force measuring mechanism.

[0009] Optionally, the first force measuring mechanism, the second force measuring mechanism, and the third force measuring mechanism are all tension gauges.

[0010] Optionally, the load-bearing cable and the elastic sling are connected by a clamp.

[0011] Optionally, the drive system includes an actuating cylinder, the cylinder body of which is connected to the bottom of the frame, the free end of the cylinder rod of which is connected to one end of the third force measuring mechanism, and the other end of the third force measuring mechanism is connected to the middle of the elastic sling.

[0012] Optionally, a displacement sensor is provided between the free end of the cylinder rod of the actuating cylinder and the third force measuring mechanism.

[0013] Optionally, the frame is equipped with a catenary laser goniometer and an elastic sling laser goniometer.

[0014] Optionally, the frame includes a base, a left column, a right column, and a crossbeam; the left column and the right column are respectively provided on the left and right sides of the base, and the two ends of the crossbeam are respectively connected to the top of the left column and the top of the right column.

[0015] The present invention achieves the following technical effects compared to the prior art:

[0016] This invention discloses a vibration fatigue testing device for contact wire elastic suspenders. The device conducts tests on the entire elastic suspender system, including suspender clamps and suspender lines. During the test, the displacement, speed, and acceleration of the actuating cylinder are controlled to regulate parameters such as displacement, tension, and the angle with the catenary cable. A downward-driven mechanism effectively simulates the actual vibration fatigue process of the elastic suspender. The test method and device are simple to operate, feature closed-loop control, high control precision, and good test stability, effectively evaluating the performance and lifespan of the elastic suspender. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the contact wire elastic suspension cable vibration fatigue testing device of the present invention.

[0019] Explanation of reference numerals in the attached diagram: 1. Base; 2. Left column; 3. Right column; 4. Crossbeam; 5. Actuating cylinder; 6. Helical spring; 7. Catenary cable; 8. Elastic sling clamp; 9. Elastic sling; 10. Displacement sensor; 11. Suspension wire tension gauge; 12. Catenary cable tension gauge; 13. Elastic sling tension gauge; 14. Catenary cable laser goniometer; 15. Elastic sling laser goniometer. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figure 1As shown, this embodiment provides a vibration fatigue testing device for an elastic suspension cable of a contact network, including a frame, a load-bearing cable 7, an elastic suspension cable 9, a drive system, and a buffer system. The two ends of the load-bearing cable 7 are connected to both sides of the frame, one end of the elastic suspension cable 9 is connected to one side of the frame, and the other end of the elastic suspension cable 9 is connected to the load-bearing cable 7. A first force-measuring mechanism is provided between one end of the load-bearing cable 7 and the frame, and a second force-measuring mechanism is provided between one end of the elastic suspension cable 9 and the frame. A buffer mechanism is also provided between the second force-measuring mechanism and the frame. The drive system is mounted on the frame, with its free end connected to the elastic suspension cable 9, and a third force-measuring mechanism is provided between the free end of the drive system and the elastic suspension cable 9.

[0022] In this specific embodiment, the first force measuring mechanism is a load-bearing cable tension gauge 12; the second force measuring mechanism is a spring suspension tension gauge 13; and the third force measuring mechanism is a drop wire tension gauge 11.

[0023] The frame includes a base 1, a left column 2, a right column 3, and a crossbeam 4; the base 1 is fixed to the ground; the left column 2 and the right column 3 are respectively set on the left and right sides of the base 1, and the two ends of the crossbeam 4 are connected to the top of the left column 2 and the top of the right column 3 respectively.

[0024] The drive system includes an actuating cylinder 5, whose cylinder body is mounted on the base 1. The free end of the cylinder rod of the actuating cylinder 5 is connected in sequence to a displacement sensor 10 and a suspension wire tension gauge 11. The upper end of the suspension wire tension gauge 11 is connected to the elastic sling 9 via a clamp. The up-and-down movement of the actuating cylinder 5 drives the elastic sling 9 to move up and down, thereby moving the elastic sling clamp 8 and the load-bearing cable 7. The displacement sensor 10 monitors the displacement of the actuating cylinder 5 during its up-and-down movement and controls the waveform of the test device by adjusting its speed and acceleration. The suspension wire tension gauge 11 monitors the load exerted by the actuating cylinder 5 on the elastic sling 9 in real time.

[0025] One end of the catenary cable 7 is fixed to the left column 2, and the other end is connected to the catenary cable tension gauge 12, and then fixed to the right column 3. The tension applied to the catenary cable 7 can be adjusted by the catenary cable tension gauge 12 to simulate the actual tension of the catenary cable 7 in the actual field. Furthermore, it can be used to monitor the tension changes of the catenary cable 7 during vibration fatigue testing.

[0026] One end of the elastic sling 9 is installed on the support cable 7 via the elastic sling clamp 8, and then connected in sequence to the elastic tension gauge 13 and the helical spring 6, finally fixed to the right column 3. The elastic tension gauge 13 measures the tension change of the elastic sling 9 during the vibration fatigue test. The helical spring 6 simulates the buffering effect of the contact network, buffering the tension of the elastic sling 9 during the vibration fatigue test, and forming a closed loop with the displacement control process of the actuator cylinder 5. By adjusting the displacement, velocity, and acceleration of the actuator cylinder 5 and matching it with the elasticity of the helical spring 6, the tension of the elastic sling 9 during the vibration fatigue test is controlled.

[0027] A catenary laser goniometer 14 and an elastic cable laser goniometer 15 are installed on the right column 3. The catenary laser goniometer 14 measures the angle between the catenary cable 7 and the horizontal plane during the vibration fatigue test, and the elastic cable laser goniometer 15 measures the angle between the inclined section of the elastic cable 9 and the horizontal plane during the vibration fatigue test. The sum of the two measured angles is the angle parameter of the elastic cable 9 during the test.

[0028] During the vibration fatigue test of the elastic sling 9, the elastic sling 9 is driven to move up and down by the actuating cylinder 5. The displacement of the actuating cylinder 5, the included angle of the elastic sling 9, and the tension of the elastic sling 9 are the three key parameters of the vibration fatigue test. These parameters are controlled by adjusting the tension of the load-bearing cable 7, the elasticity of the helical spring 6, the tension of the elastic sling 9, and the displacement of the actuating cylinder 5, and a control waveform is formed by the actuating cylinder 5.

[0029] During the vibration fatigue test of the elastic sling 9, the actuating cylinder 5 is first installed on the base 1, followed by the displacement sensor 10 and the suspension cable tension gauge 11. One end of the support cable 7 is then fixed to the left column 2 and connected to the support cable tension gauge 12. A fixed tension is applied according to the working conditions, and the other end is fixed to the right column 3. Next, the elastic sling clamp 8 of the elastic sling 9 is installed on the support cable 7 and connected to one end of the elastic sling 9. The elastic sling 9 is then connected to the actuating cylinder 5. The other end of the elastic sling 9 is then fitted with a suspension cable tension gauge 13 and a helical spring 6, applying a fixed tension to the elastic sling 9. Finally, the other end of the elastic sling 9 is fixed to the right column 3. During the installation of the elastic sling 9, it is necessary to adjust the output displacement of the actuator cylinder 5 and the angle between the elastic sling 9 and the load-bearing cable 7. By adjusting the tension applied to the elastic sling 9, the right side of the elastic sling 9 after being connected to the actuator cylinder 5 is made horizontal, and then the elastic sling 9 is fixed to the right column 3.

[0030] After the installation of the cable and the application of tension are completed, the actuator cylinder 5 is activated to move it up and down slowly. The data changes of each measuring system, including the displacement sensor 10, the suspension wire tension gauge 11, the load-bearing cable tension gauge 12, the elastic cable tension gauge 13, the load-bearing cable laser goniometer 14, and the elastic cable laser goniometer 15, are monitored. Based on the displacement of the elastic cable 9, the included angle of the elastic cable 9, and the tension of the elastic cable 9 required by the actual service conditions, the movement speed and acceleration of the actuator cylinder 5 are controlled to achieve the parameters required for the test. Then, the vibration fatigue test is carried out according to the test frequency.

[0031] A catenary laser angle measuring instrument 14 and an elastic sling laser angle measuring instrument 15 are installed sequentially on the right column 3. They respectively monitor the angles between the catenary 7, the elastic sling 9 and the horizontal. The angle of the elastic sling 9 is the sum of the angles of the catenary laser angle measuring instrument 14 and the elastic sling laser angle measuring instrument 15.

[0032] During the vibration fatigue test, the actuator cylinder 5 moves downward, causing the elastic sling 9 and the support cable 7 to move downward as well. The angle between the support cable 7 and the elastic sling 9 increases, and the load on the spring-loaded tension gauge 13 also increases slowly. When the actuator cylinder 5 moves rapidly upward, simulating the dynamic lifting of the pantograph of an actual train, the angle between the support cable 7 and the elastic sling 9 decreases rapidly, and the load on the spring-loaded tension gauge 13 increases rapidly. During the angle change, due to the buffering effect of the helical spring 6, the tension of the elastic sling 9 measured by the spring-loaded tension gauge 13 is also buffered, and its tension fluctuates continuously. The up-and-down movement of the actuator cylinder 5 constitutes a cyclic process.

[0033] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0034] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A vibration fatigue testing device for elastic suspension cables of overhead contact lines, characterized in that, The system includes a frame, a load-bearing cable, an elastic sling, a drive system, and a buffer system. The load-bearing cable is connected at both ends to the two sides of the frame. One end of the elastic sling is connected to one side of the frame, and the other end is connected to the load-bearing cable. A first force-measuring mechanism is provided between one end of the load-bearing cable and the frame, and a second force-measuring mechanism is provided between one end of the elastic sling and the frame. The buffer system is also provided between the second force-measuring mechanism and the frame. The drive system is mounted on the frame, and its free end is connected to the elastic sling. A third force-measuring mechanism is provided; a catenary laser angle measuring instrument and an elastic sling laser angle measuring instrument are provided on the frame; the buffer system includes a helical spring, one end of which is connected to one end of the elastic sling, and the other end of which is connected to one end of the second force-measuring mechanism; the drive system includes an actuating cylinder, the cylinder body of which is connected to the bottom of the frame, the free end of the cylinder rod of which is connected to one end of the third force-measuring mechanism, and the other end of the third force-measuring mechanism is connected to the middle of the elastic sling; a displacement sensor is provided between the free end of the cylinder rod of the actuating cylinder and the third force-measuring mechanism.

2. The contact wire elastic suspension cable vibration fatigue testing device according to claim 1, characterized in that, The first force measuring mechanism, the second force measuring mechanism, and the third force measuring mechanism are all tension gauges.

3. The contact wire elastic suspension cable vibration fatigue testing device according to claim 1, characterized in that, The catenary cable and the elastic suspender cable are connected by a clamp.

4. The contact wire elastic suspension cable vibration fatigue testing device according to claim 1, characterized in that, The frame includes a base, a left column, a right column, and a crossbeam; the left column and the right column are respectively provided on the left and right sides of the base, and the two ends of the crossbeam are respectively connected to the top of the left column and the top of the right column.

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