Vibration fatigue test system for overhead contact system steady arm

Abstract

Disclosed is a vibration fatigue test system for an overhead contact system steady arm 5 used in electrification railway. The system comprises a frame, a fixing assembly, a driving system (actuating c

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of elastic cable test devices, and in particular relates to a vibration fatigue test system for an overhead contact system steady arm. BACKGROUND

[0002] Steady arm is an important part of overhead contact system in electrification railway, which mainly plays a steady role. In the actual service process, the steady arm device is mainly used to keep the contact wire at a fixed height and tension the contact wire to keep it at a fixed pull-out value. The steady arm moves upward due to the lifting effect of pantographs when the train passes by, and droops downwards after the train passes by, and then vibrates up and down. Meanwhile, the steady arm of the steady device is generally connected to the drop bracket by a hook, and thus the fatigue wear may occur at the hook position when the steady arm tensions the contact wire and vibrates up and down.

[0003] The existing steady arms are mainly tested according to TB / T 2074-2020 Test methods of fittings for overhead contact system in electrification railway, TB / T 2075.3-2020 Fittings for overhead contact system in electrification railway-Part 3: Limited steady device, and TB / T 2075.4-2020 Fittings for overhead contact system in electrification railway-Part 4: Non-limited steady device. The steady arm is subjected to the vibration test and the fatigue test, respectively. In the vibration test, only the lifting displacement of the overhead contact system is controlled by adopting constant amplitude vibration, while in the fatigue, the tension-tension fatigue is applied. The two tests are carried out independently, without considering the mutual influence factors between vibration and fatigue in the actual service process. Moreover, the existing test control parameters are quite different from the actual service conditions of the field steady arm, including the rotation angle of the steady hook, the elastic buffering of the overhead contact system and the like, and thus the actual service conditions of the steady arm cannot be truly reflected.

[0004] At present, the vibration fatigue test for the existing steady arm is carried out independently. The vibration test is carried out at first, including, installing a steady arm on a simulated vibration field, and then applying displacement at the steady point, wherein the load of the steady arm, the elastic buffering, and the rotation angle of the hook during the vibration of the steady arm are not effectively controlled; while in the fatigue test process, only the tension-tension fatigue is simulated, without considering the interaction effect of the vibration process on fatigue. The existing test methods and devices without fully considering the correlation of the vibration fatigue test cannot effectively reflect the actual service condition parameters. SUMMARY

[0005] To solve the technical problem above, the present invention provides a vibration fatigue test system for an overhead contact system steady arm according to claim 1, which comprehensively considers the vibration fatigue processes of the steady arm, such as up-down vibration, tension-tension fatigue, hook wear and the like, and controls the displacement, load, movement angle, elastic buffering and the like of the steady arm in a closed loop. In the test process, the vibration and fatigue processes are comprehensively considered, the interaction of the vibration and fatigue processes is more matched with the actual service process and service parameters, and thus the purpose of simulating the vibration fatigue process of the actual steady arm is effectively achieved. 06 09 23

[0007] The present invention provides a vibration fatigue test system for an overhead contact system steady arm as defined in claim 1. The system comprises a frame, a fixing assembly, a driving system, and a buffer assembly. The fixing assembly and the buffer assembly are both arranged at the top of the frame, and are configured to be connected to respective ones of the two ends of the steady arm. The driving system is arranged on the frame and below the buffer assembly. The fixing assembly comprises a fixed base and a drop bracket. The fixed base is arranged at the top of the frame, the top of the drop bracket is connected to the fixed base, and the bottom of the drop bracket is configured to be rotatably connected to the steady arm. The buffer assembly comprises a fixed bearing, a spring, a spring connection clamp, and a steady clamp. The fixed bearing is arranged at the top of the frame, the bottom of the fixed bearing is connected to one end of the spring, the other end of the spring is connected to the spring connection clamp, the steady clamp is connected to the spring connection clamp, and the steady clamp is configured to be rotatably connected to the steady arm. The driving system comprises an actuating cylinder. A cylinder body of the actuating cylinder is connected to the bottom of the frame, and a displacement sensor and a longitudinal force sensor are arranged between the free end of a cylinder rod of the actuating cylinder and the buffer assembly.

[0011] Optionally, the longitudinal force sensor is connected to an actuating cylinder connection clamp, the actuating cylinder connection clamp and the steady clamp are both connected to a contact wire, and a transverse force sensor is arranged between the contact wire and the frame.

[0012] Optionally, the contact wire is connected to the transverse force sensor by means of a wire.

[0013] Optionally, the frame is provided with a laser goniometer.

[0014] Optionally, the frame comprises a base, a left post, a right post and a beam. The left side and the right side of the base are respectively provided with the left post and the right post, the two ends of the beam are respectively connected to the top of the left post and the top of the right post.

[0015] Compared with the prior art, the present disclosure obtains the following technical effects:

[0016] 1. The steady arm, the drop bracket, the steady clamp, the contact wire and the like of the steady device are installed together, the vibration fatigue test is carried out by applying the displacement of the actuating cylinder and the tension of the wire to control the amplitude, angle and tension of the up-down displacement of the steady arm; the space is saved as the test system is less in floor occupation; and a plurality of test processes are combined for test, thus the separate test processes are avoided, and the test efficiency is improved.

[0017] 2. The closed-loop control is achieved by controlling four main parameters: displacement, angle, longitudinal load and horizontal load, and the precision of the parameters is controlled by adjusting the displacement, speed and acceleration of the actuating cylinder, the tension of the cable, and the elasticity of the spring in a matched manner. The control system is high in precision and good in stability.

[0018] 3. The system comprises the displacement sensor, the force sensor and the goniometer to perform monitoring and control from multiple angles, thus guaranteeing the precision and accuracy of the test device.

[0019] 4. The test system is relatively simple and structure and easy to operate, and the load of the steady arm can be buffered by the spring, such that the impact of heavy load is avoided, and the service life of the equipment is prolonged. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To describe the technical solutions in the embodiments of the present disclosure or in the prior art more clearly, the following briefly introduces the accompanying drawings required for describing the embodiments. Apparently, the accompanying drawings in the following 06 09 23 description show merely some embodiments of the present disclosure, and those of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts.

[0021] FIG. 1 is a structure diagram of a vibration fatigue test system for an overhead contact system steady arm in accordance with the present disclosure.

[0022] In the drawings: 1-baseplate; 2-left post; 3-right post; 4-transverse tube; 5-steady arm; 6-drop bracket; 7-steady clamp; 8-contact wire; 9-wire; 10-actuating cylinder connection clamp; 11-spring connection clamp; 12-fixed base; 13-fixed bearing; 14-actuating cylinder; 15-spring; 16-longitudinal force sensor; 17-displacement sensor; 18-transverse force sensor; 19-laser goniometer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The foilowing clearly and completely describes the technical solutions in the embodiments of the present disclosure with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are merely a part rather than all of the embodiments of the present disclosure. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.

[0024] As shown in FIG. 1, the embodiment provides a vibration fatigue test system for an overhead contact system steady arm. The system comprises a frame, a fixing assembly, a driving system, and a buffer assembly. The fixing assembly and the buffer assembly are both arranged at the top of the frame, and are respectively configured to be connected to the two ends of the steady arm 5. The driving system is arranged on the frame and below the buffer assembly.

[0025] In a specific embodiment, the frame comprises a base, a left post 2, a right post 3, and a beam. The base is fixed on the ground, the left side and the right side of the base are respectively provided with the left post 2 and the right post 3, the two ends of the beam are respectively connected to the top of the left post 2 and the top of the right post 3.

[0026] The actuating cylinder 14 is installed on a baseplate 1, is upwardly connected with a displacement sensor 17, a longitudinal force sensor 16 and an actuating cylinder connection clamp 10 in sequence, and then is connected to a contact wire 8 by the actuating cylinder connection clamp 10. The actuating cylinder 14 moves up and down to drive the displacement sensor 17, the longitudinal force sensor 16, the actuating cylinder connection clamp 10 and the contact wire 8 to move up and down together, where the displacement sensor 17 is configured to monitor the displacement in the movement process, and the longitudinal force sensor 16 is configured to monitor dynamic load change in the movement process.

[0027] A drop bracket 6 is vertically installed on the transverse tube 4 by the fixed base 12, and then is connected to the steady arm 5 by a hook of the drop bracket 6. The other end of the steady arm 5 is respectively connected to the steady clamp 7 and the contact wire 8. The contact wire 8 is horizontally connected to a wire 9 and a transverse force sensor 18 in series, and the other end of the wire 9 is fixed to the left post 2. The horizontal tension load is applied to the steady arm 5 of a steady device by the wire 9, and the horizontal load change is detected by the transverse force sensor 18.

[0028] A spring connection clamp 11 and a spring 15 buffer are sequentially connected to the upper end of the contact wire 8 at the same time, the spring 15 buffer is installed on the fixed bearing 13, and the fixed bearing 13 is installed on the transverse tube 4. In the up-down movement process of the contact wire 8, the elastic buffering of the overhead contact system is simulated by the spring 15 buffer to buffer the dynamic load in the steady arm 5, and the longitudinal load change of the steady arm 5 is monitored by the longitudinal force sensor 16. 06 09 23

[0029] A laser goniometer 19 is installed on the baseplate 1 to monitor the change of an included angle between the steady arm 5 in the up-down movement process and the drop bracket 6 in real time, thus evaluating the wear condition of the hook in the steady arm 5.

[0030] In the test process, the up-down movement of the actuating cylinder 14 drives the contact wire 8 and the steady arm 5 to move up and down together, and meanwhile, the horizontal tension load is applied by the wire 9, and the dynamic change of the transverse load is detected by the transverse force sensor 18. The dynamic impact load of the steady arm 5 when moving up and down is retarded by the spring 15 buffer, and the dynamic load change of the steady arm 5 is monitored by the longitudinal force sensor 16. In the up-down movement process of the steady arm 5 of the steady device, a connecting portion of the steady arm 5 and the hook of the drop bracket 6 is driven to swing up and down to simulate the wear of the connecting portion, and the angle change of the steady arm 5 is monitored by the laser goniometer 19. In accordance with the system, the up-down vibration, fatigue load, fatigue wear and up-down buffering of the steady arm 5 are simulated, the purpose of simulating the field service conditions is achieved, and the vibration fatigue service performance and service life of the steady arm 5 are studied. The displacement of the up-down movement, the longitudinal dynamic load, the horizontal dynamic load and the included angle of the hook of the steady arm 5 are four key parameters needing to be controlled, and the four parameters are monitored by a measuring system and fed back to a control system. By adjusting the initial tension on the wire 9, the elasticity of the spring 15 buffer, the movement speed and acceleration of the actuating cylinder 14, the dynamic regulation and closed-loop control can be carried out to improve the control precision of each parameter and the stability of the test system.

[0031] In the vibration fatigue test process of the steady arm 5, the actuating cylinder 14 is installed on the baseplate 1, and then the displacement sensor 17, the longitudinal force sensor 16 and the actuating cylinder connection clamp 10 are sequentially installed on the actuating cylinder. The drop bracket 6 is longitudinally installed on the transverse tube 4 by the fixed base 12, then the hook of the steady arm 5 is connected to a loop of the drop bracket 6, and the steady clamp 7 and the contact wire 8 are sequentially installed on the other end of the steady arm 5. The contact wire 8 and the actuating cylinder connection clamp 10 are connected together. Meanwhile, the contact wire 8 is connected to the wire 9 and the transverse force sensor 18 in sequence, and after the fixed tension is applied to the wire 9, the other end of the wire 9 is fixed to the left post 2. The spring 15 buffer is installed on the transverse tube 4 by the fixed bearing 13, the lower end of the spring 15 buffer is connected to the contact wire 8 by the spring connection clamp 11. The laser goniometer 19 is installed on the baseplate 1, and is aligned with the steady arm 5. After the installation is completed, a power supply and the control system of the actuating cylinder 14 are turned on to drive the displacement sensor 17, the longitudinal force sensor 16 and the contact wire 8 to move up and down together, the upward movement simulates the impact action on a pantograph of a train, and downward movement simulates the static load action of the steady arm 5 after the train passes by. The displacement change in the up-down movement process is monitored by the displacement sensor 17, and the longitudinal dynamic load change in the up-down movement process is monitored by the longitudinal force sensor 16. In the up-down movement process, the contact wire 8 drives the steady arm 5 to move up and down together, the steady arm 5 is connected to the drop bracket 6 by the hook, and the angle change of the steady arm 5 in the up-down movement process is monitored by the laser goniometer 19. Meanwhile, in the up-down movement process of the contact wire 8 and the steady arm 5, the transverse force sensor 18 is configured to monitor the horizontal dynamic load change of the steady arm 5; and meanwhile, the spring 15 buffer is configured to buffer the dynamic impact load in the up-down movement process of the contact wire 8 and the steady arm 5. 06 09 23

[0032] The actuating cylinder 14 moves upwards to simulate the upward dynamic lifting action of the pantograph when the train passes by, which drives the contact wire 8 and the steady arm 5 to move upwards, the spring 15 buffer is compressed, the loads of the longitudinal force sensor 16 and the transverse force sensor 18 tend to increase, and the angle of the laser goniometer 19 increases. The actuating cylinder 14 moves downwards to simulate the downward drooping process of the steady arm 5 after the train passes by; the loads of the longitudinal force sensor 16 and the transverse force sensor 18 also increase from small to large, and the angle of the laser goniometer 19 decreases. The up-down movement of the actuating cylinder 14 simulates the longitudinal vibration. In the up-down movement process, the fatigue load action is simulated by the load applied by the wire 9, the wear process of the steady arm 5 through the connection of the steady arm 5 and the hook of the drop bracket 6 and the change of the included angle between the steady arm 5 and the drop bracket 6. In addition, the change characteristics of displacement, load and angle are monitored in real time, the steady arm 5 forms a closed loop with the actuating cylinder 14 and the control system, and relevant parameters are adjusted in real time so as to dynamically simulate the vibration fatigue characteristics of the steady arm 5 in the actual service process.

[0033] It should be noted that: for those skilled in the art, apparently, the present disclosure is not limited to details of the exemplary embodiments, and may be expressed in other specific forms. Therefore, in any way, the embodiments should be regarded as exemplary, not limitative; and the scope of the present disclosure is limited by the appended claims, instead of the above description. Thus, all variations intended to fall into the meaning and scope of equivalent elements of the claims should be covered within the present disclosure.

[0034] Several examples are used for illustration of the principles and implementation methods of the present disclosure. The description of the embodiments is merely used to help illustrate the method and its core principles of the present disclosure. In addition, a person of ordinary skill in the art can make various modifications in terms of specific embodiments and scope of application in accordance with the teachings of the present disclosure. In conclusion, the content of this specification shall not be construed as a limitation to the present disclosure.

Claims

1. A vibration fatigue test system for an overhead contact system steady arm, comprising a frame, a fixing assembly, a driving system, and a buffer assembly, wherein the fixing assembly and the buffer assembly are both arranged at the top of the frame, and are respectively configured to be connected to the two ends of the steady arm, and the driving system is arranged on the frame and below the buffer assembly.

2. The vibration fatigue test system for the overhead contact system steady arm according to claim 1, wherein the fixing assembly comprises a fixed base and a drop bracket, the fixed base is arranged at the top of the frame, the top of the drop bracket is connected to the fixed base, and the bottom of the drop bracket is configured to be rotatably connected to the steady arm.

3. The vibration fatigue test system for the overhead contact system steady arm according to claim 1, wherein the buffer assembly comprises a fixed bearing, a spring, a spring connection clamp, and a steady clamp; the fixed bearing is arranged at the top of the frame, the bottom of the fixed bearing is connected to one end of the spring, the other end of the spring is connected to the spring connection clamp, the steady clamp is connected to the spring connection clamp, and the steady clamp is configured to be rotatably connected to the steady arm.

4. The vibration fatigue test system for the overhead contact system steady arm according to claim 3, wherein the driving system comprises an actuating cylinder, a cylinder body of the actuating cylinder is connected to the bottom of the frame, and a displacement sensor and a longitudinal force sensor are arranged between the free end of a cylinder rod of the actuating cylinder and the buffer assembly.

5. The vibration, fatigue test system for the overhead contact system steady arm according to claim 4, wherein the longitudinal force sensor is connected to an actuating cylinder connection clamp, the actuating cylinder connection clamp and the steady clamp are both connected to a contact wire, and a transverse force sensor is arranged between the contact wire and the frame.

6. The vibration fatigue test system for the overhead contact system steady arm according to claim 5, wherein the contact wire is connected to the transverse force sensor by means of a wire.

7. The vibration fatigue test system for the overhead contact system steady arm according to claim 1, wherein the frame is provided with a laser goniometer.

8. The vibration fatigue test system for the overhead contact system steady arm according to claim 1, wherein the frame comprises a base, a left post, a right post and a beam; the left side and the right side of the base are respectively provided with the left post and the right post, the two ends of the beam are respectively connected to the top of the left post and the top of the right post.

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