Contact network dropper fatigue test device for simulating field actual working condition

Abstract

The invention discloses an overhead line system dropper fatigue test device simulating on-site actual working conditions, and relates to the technical field of fatigue tests.The overhead line system dropper fatigue test device comprises a supporting plate, springs, spring bases, a carrier cable tool and a lifting plate, the lifting plate is arranged at the top of a supporting frame, the top of the lifting plate is connected with the supporting plate through the springs, and the carrier cable tool is arranged at the bottom of the supporting plate; the carrier cable dropper wire clamp is used for fixing the whole dropper; the control device comprises a contact line tool, a push rod, an annular force sensor, a motor, a displacement measuring sheet and a laser displacement sensor, and the contact line tool is arranged at the top of the push rod and used for fixing a contact line dropper wire clamp of the whole dropper; the push rod is driven by a motor to perform lifting and stretching motion and is used for simulating the process that the pantograph lifts the integral dropper from the lower end and then is straightened in actual service; the on-site service condition of the integral dropper can be truly simulated, the test is carried out by lifting and stretching the integral dropper at the lower end, and the accuracy of the test result is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fatigue test, in particular to a catenary dropper fatigue test device simulating actual working conditions. BACKGROUND

[0002] The integral dropper is an important component of the catenary of electrified railway, with the largest quantity and the highest failure probability. Its main function is to control the height of the contact wire and transfer force between the catenary and the contact wire to ensure good current collection quality of the catenary system. When the train passes, the integral dropper is bent by the uplift of the contact wire by the train's pantograph, and then quickly falls down due to gravity after the train passes. In the above repeated process, it bears complex load. In actual maintenance process, the integral dropper has a large amount of maintenance work due to a large number of faults, and some faults are not easy to troubleshoot, which may cause safety hazards and damage to the pantograph, endangering the safety of train operation. Therefore, it is necessary to carry out fatigue test on the integral dropper and ensure that the loading conditions of the fatigue test are consistent with the field service conditions, which is very important for the prediction and research of the service life of the integral dropper.

[0003] The existing test method mainly carries out integral dropper fatigue test according to TB / T 2074-2020 "Test Methods for Components of Catenary for Electrified Railway", TB / T 2075.7-2020 "Components of Catenary for Electrified Railway Part 7: Integral Dropper and Dropper Clamp", Q / CR979.7-2023 "Components of Catenary for Electrified Railway Part 7: Integral Dropper". The test is usually carried out on a fatigue testing machine, the compression amplitude and force control are adopted in the test process, the integral dropper is tested together with its special clamp, and the test frequency is 2x106 times. The integral dropper fatigue testing machine is usually a single channel, only one dropper is tested, the upper lifting driving mode is adopted to drive the dropper to lift up, or the counterweight free-fall mode is adopted. The existing integral dropper fatigue test has the following shortcomings:

[0004] 1) The load loading source of the integral dropper fatigue test device currently mainly relies on hanging weights or heavy objects to apply load to the dropper. The free-fall test is easy to cause the dropper to vibrate multiple times, affecting the test results, and the size of the load needs to be adjusted by replacing the weights according to the requirements, and the test process is complex. Or use a variable frequency motor, that is, use a single motor to realize multiple channel functions, but the control precision is general. Or use an electro-hydraulic servo type, which has the characteristics that long-term piston movement is prone to fatigue problems, especially in the case of 2x106 times of single dropper fatigue test, there is a durability bottleneck problem.

[0005] 2) Existing fatigue test methods essentially load the upper end of the integral dropper string. However, in actual service conditions, the integral dropper string is bent by the pantograph on top of the train, which lifts the contact wire from the lower end. After the train passes, the contact wire moves downward, causing the dropper string to straighten. This shows a significant difference between the existing loading conditions and the actual service conditions.

[0006] 3) The single-channel fatigue test device can only perform fatigue tests on one suspension string at a time, and the number of fatigue tests is two million. The test efficiency is too low, and the problem of a large number of suspension strings cannot be completed in a short time. Summary of the Invention

[0007] The purpose of the present invention is to provide a contact network dropper string fatigue test device that simulates actual on-site working conditions to solve the problems existing in the above-mentioned prior art. It can truly simulate the on-site service conditions of the entire dropper string, and conduct tests by lifting and stretching the entire dropper string at the lower end to ensure the accuracy of the test results.

[0008] To achieve the above object, the present invention provides the following solutions:

[0009] The present invention provides a catenary suspension string fatigue test device simulating actual on-site working conditions, comprising a supporting device, a buffer device and a control device;

[0010] The supporting device is a supporting frame;

[0011] The buffer device includes a support plate, a spring, a spring base, a load-bearing cable fixture, and a lifting plate. The lifting plate is arranged on the top of the support frame. The height of the lifting plate can be adjusted by an adjusting member. The top of the lifting plate is connected to the support plate via the spring. The load-bearing cable fixture is arranged on the bottom of the support plate and is used to fix the load-bearing cable string clamp of the integral suspension string.

[0012] The control device includes a contact line tooling, a push rod, an annular force sensor, a motor, a displacement measuring piece and a laser displacement sensor. The contact line tooling is arranged at the top of the push rod and opposite to the load-bearing cable tooling, and is used to fix the contact line string clamp of the integral suspension string; the push rod is arranged at the top of the motor and is driven by the motor to perform lifting and stretching movements, which is used to simulate the process of the pantograph lifting the integral suspension string from the lower end and then straightening it during actual service. The annular force sensor is arranged on the push rod, and is used to monitor the force condition of the integral suspension string in real time during fatigue testing. The displacement measuring piece is arranged on the push rod and moves up and down with the push rod. The laser displacement sensor is arranged on the support frame. The laser displacement sensor can hit the displacement measuring piece with a laser, and is used to monitor the displacement condition of the lower end of the integral suspension string in real time during fatigue testing.

[0013] Preferably, the support frame comprises a top plate, a base, outer frame guide rods, middle guide rods and a partition plate, the top plate and the base are supported by the outer frame guide rods at the four corners, the top plate and the base are separated into two independent test spaces by the partition plate, the middle guide rods are arranged on the front and back sides of the partition plate, and the buffer device and the control device are arranged in the two test spaces.

[0014] Preferably, the lifting plate in each buffer device is provided with two, the two lifting plates are in the same horizontal plane, one lifting plate is connected to two outer frame guide rods on the same side through a lifting plate base, the other lifting plate is connected to two middle guide rods through a lifting plate base, and the lifting plate base is connected to the outer frame guide rods and the middle guide rods through adjusting bolts, respectively, and a plurality of screw holes matched with the adjusting bolts are arranged on the corresponding outer frame guide rods and middle guide rods in the height direction.

[0015] Preferably, the spring is provided with two, one end of the two springs is connected to two lifting plates through a spring base, respectively, and the other end is connected to both ends of the support plate, respectively.

[0016] Preferably, the load-bearing cable tool is arranged between the two springs, and the two springs are symmetrically arranged with the load-bearing cable tool as the center.

[0017] Preferably, the ring-shaped force sensor is arranged at the top of the push rod.

[0018] Preferably, the displacement measuring sheet is arranged between the ring-shaped force sensor and the motor.

[0019] Preferably, the laser displacement sensor is arranged on the base.

[0020] Preferably, the motor is a linear motor.

[0021] The present application has the following technical effects relative to the prior art:

[0022] 1) The linear motor is used as the control source of force and displacement in the present application, without the need for suspension counterweight or configuration of weights, the size of the load force can be adjusted according to actual needs, so that the maximum tensile stress inside the whole hanging string is not affected by other factors, the instantaneous stress condition of the whole hanging string during the test process is guaranteed, compared with the frequency conversion motor and the electro-hydraulic servo type, the present application has the advantages of high control precision, less mechanical wear, long service life, easy operation and the like.

[0023] 2) The present application simulates the process of lifting and stretching the whole catenary from the lower part by the front and rear pantographs, realizes the consistency of the test working condition of the whole catenary with the field service working condition, and ensures the accuracy of the test results.

[0024] 3) The present application controls the independent movement of the double cylinders by the background test system, can simultaneously perform the fatigue test on two whole catenaries under different working conditions, is suitable for whole catenaries of different lengths, ensures the timely completion of the fatigue test of the whole catenary, simplifies the test period, and improves the test efficiency.

[0025] 4) The present application has a simple structure, saves the occupied space, is light in weight, and is low in maintenance and maintenance cost. In addition, the ring-shaped force sensor and the laser displacement sensor can be used for real-time monitoring and feedback to the background test system, and the dynamic parameter adjustment and closed-loop control can be performed according to the requirements. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Fig. 1 It is a schematic diagram of the three-dimensional structure of the overhead line catenary fatigue test device in the present application which simulates the actual field working condition.

[0028] Fig. 2 It is a front view of the overhead line catenary fatigue test device in the present application which simulates the actual field working condition.

[0029] In the figure: 1, top plate; 2, base; 3, outer frame guide rod; 4, support plate; 5, spring; 6, spring base; 7, load-bearing cable tool; 8, lifting plate; 9, lifting plate base; 10, contact wire tool; 11, push rod; 12, ring-shaped force sensor; 13, motor; 14, displacement measuring piece; 15, laser displacement sensor; 16, middle guide rod; 17, partition plate. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0031] The purpose of the present application is to provide a catenary wire dropper fatigue test device that simulates actual field conditions to solve the problems existing in the prior art.

[0032] In order to make the above-mentioned purposes, characteristics and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0033] The catenary wire dropper fatigue test device that simulates actual field conditions in the present embodiment, as shown in Figs. 1-2 includes a support device, a buffer device and a control device;

[0034] The support device is a support frame;

[0035] The buffer device includes a support plate 4, a spring 5, a spring base 6, a load cable tool 7 and a lifting plate 8, the lifting plate 8 is arranged at the top of the support frame, the height of the lifting plate 8 can be adjusted through an adjusting piece, the top of the lifting plate 8 is connected to the support plate 4 through the spring 5, the load cable tool 7 is arranged at the bottom of the support plate 4 and is used to fix the load cable dropper clamp of the whole dropper;

[0036] The control device includes a contact wire tool 10, a push rod 11, a ring-shaped force sensor 12, a motor 13, a displacement measuring sheet 14 and a laser displacement sensor 15, the contact wire tool 10 is arranged at the top of the push rod 11 and is opposite to the load cable tool 7, and is used to fix the contact wire dropper clamp of the whole dropper; the push rod 11 is arranged at the top of the motor 13 and is driven by the motor 13 to perform lifting and stretching movements, and is used to simulate the process that the pantograph lifts the whole dropper from the lower end and then straightens it during actual service, the ring-shaped force sensor 12 is arranged on the push rod 11 and is used to monitor the stress of the whole dropper in real time during the fatigue test, the displacement measuring sheet 14 is arranged on the push rod 11 and moves up and down with the push rod 11, and the laser displacement sensor 15 is arranged on the support frame, the laser displacement sensor 15 can shoot laser on the displacement measuring sheet 14, and is used to monitor the displacement of the lower end of the whole dropper in real time during the fatigue test.

[0037] In the present embodiment, the support frame includes a top plate 1, a base 2, outer frame guide rods 3 at four corners, a middle guide rod 16 and a partition plate 17, the top plate 1 and the base 2 are supported by the outer frame guide rods 3 at four corners, the top plate 1 and the base 2 are separated into two independent test spaces by the partition plate 17, the middle guide rod 16 is arranged on the front and rear sides of the partition plate 17, and the buffer device and the control device are arranged in the two test spaces. One support frame is provided with one test space and two sets of test devices, a double-channel test mode is realized, the motors 13 of the two channels can be independently controlled by the control system, and the fatigue tests of two whole droppers under different working conditions can be carried out at the same time.

[0038] In this specific embodiment, there are two lifting plates 8 in each buffer device, and the two lifting plates 8 are on the same horizontal plane. One lifting plate 8 is connected to the two outer frame guide rods 3 on the same side through the lifting plate base 9, and the other lifting plate 8 is connected to the two middle guide rods 16 through the lifting plate base 9. The lifting plate base 9 is connected to the outer frame guide rods 3 and the middle guide rods 16 respectively through adjusting bolts. The corresponding outer frame guide rods 3 and the middle guide rods 16 are provided with a plurality of screw holes that cooperate with the adjusting bolts along the height direction. When adjusting the height of the lifting plate 8, the adjustment of the position at different heights is achieved by cooperating with the adjusting bolts and the screw holes at different heights.

[0039] In this specific embodiment, two springs 5 ​​are provided. One end of the two springs 5 ​​is connected to the two lifting plates 8 respectively through the spring base 6 , and the other end is connected to the two ends of the support plate 4 respectively.

[0040] In this specific embodiment, the catenary cable fixture 7 is disposed between the two springs 5 ​​, and the two springs 5 ​​are symmetrically disposed with the catenary cable fixture 7 as the center.

[0041] In this specific embodiment, the annular force sensor 12 is disposed on the top of the push rod 11 , the displacement measuring piece 14 is disposed between the annular force sensor 12 and the motor 13 , and the laser displacement sensor 15 is disposed on the base 2 .

[0042] In this specific embodiment, the motor 13 is a linear motor; the linear motor is a single-drive controlled single-channel motor, which has the advantages of low power consumption and high control accuracy.

[0043] The catenary wire hanger fatigue test device of the present invention, which simulates actual working conditions on site, works as follows:

[0044] During the fatigue test, the height of the lifting plate 8 in the buffer system is first adjusted according to the test requirements, namely the model and specifications of the overall suspension string. The catenary and contact wire clamps at both ends of the overall suspension string are secured to the catenary fixture 7 and contact wire fixture 10, respectively. The backend test system then controls the linear motor to drive the push rod 11, annular force sensor 12, and displacement measuring piece 14 in longitudinal motion. The contact wire fixture 10 then drives the overall suspension string in repeated motion, simulating the actual on-site conditions of a pantograph lifting and stretching the overall suspension string from its lower end. Finally, the annular force sensor 12 and laser displacement sensor 15 measure the overall suspension string's force and displacement in real time during the fatigue test. Feedback is provided to the backend test system, enabling dynamic parameter adjustments and closed-loop control based on requirements.

[0045] The principles and implementation manners of the present application are described by using specific examples in the present application, and the above examples are only used for helping to understand the method of the present application and its core idea; meanwhile, for the general technical personnel in the art, according to the idea of the present application, the specific implementation manners and application ranges will be changed. In conclusion, the content of the present specification should not be understood as the limitation of the present application.

Claims

1. A catenary hanger string fatigue test device simulating actual on-site working conditions, characterized by: It includes a supporting device, a buffer device and a control device; The supporting device is a supporting frame; The buffer device includes a support plate, a spring, a spring base, a load-bearing cable fixture, and a lifting plate. The lifting plate is arranged on the top of the support frame. The height of the lifting plate can be adjusted by an adjusting member. The top of the lifting plate is connected to the support plate via the spring. The load-bearing cable fixture is arranged on the bottom of the support plate and is used to fix the load-bearing cable string clamp of the integral suspension string. The control device includes a contact line tooling, a push rod, an annular force sensor, a motor, a displacement measuring piece and a laser displacement sensor. The contact line tooling is arranged at the top of the push rod and opposite to the load-bearing cable tooling, and is used to fix the contact line string clamp of the integral suspension string; the push rod is arranged at the top of the motor and is driven by the motor to perform lifting and stretching movements, which is used to simulate the process of the pantograph lifting the integral suspension string from the lower end and then straightening it during actual service. The annular force sensor is arranged on the push rod, and is used to monitor the force condition of the integral suspension string in real time during fatigue testing. The displacement measuring piece is arranged on the push rod and moves up and down with the push rod. The laser displacement sensor is arranged on the support frame. The laser displacement sensor can hit the displacement measuring piece with a laser, and is used to monitor the displacement condition of the lower end of the integral suspension string in real time during fatigue testing.

2. The overhead catenary hanger string fatigue test device simulating actual on-site working conditions according to claim 1 is characterized in that: The support frame includes a top plate, a base, an outer frame guide rod, a middle guide rod and a partition. The top plate and the base are supported by the outer frame guide rods at the four corners. The top plate and the base are divided into two independent test spaces by the partition. The middle guide rod is arranged on the front and rear sides of the partition. The buffer device and the control device are provided in both test spaces.

3. The overhead catenary hanger string fatigue test device simulating actual on-site working conditions according to claim 2 is characterized in that: Two lifting plates are provided in each of the buffer devices, and the two lifting plates are on the same horizontal plane. One lifting plate is connected to the two outer frame guide rods on the same side through a lifting plate base, and the other lifting plate is connected to the two middle guide rods through a lifting plate base, and the lifting plate bases are respectively connected to the outer frame guide rods and the middle guide rods through adjusting bolts, and a plurality of screw holes that cooperate with the adjusting bolts are provided on the corresponding outer frame guide rods and the middle guide rods along the height direction.

4. The overhead catenary hanger string fatigue test device simulating actual on-site working conditions according to claim 3 is characterized in that: Two springs are provided, one end of the two springs is respectively connected to the two lifting plates through a spring base, and the other end is respectively connected to the two ends of the support plate.

5. The overhead catenary hanger string fatigue test device simulating actual on-site working conditions according to claim 4 is characterized in that: The load-bearing cable fixture is arranged between the two springs, and the two springs are symmetrically arranged with the load-bearing cable fixture as the center.

6. The overhead catenary hanger string fatigue test device simulating actual on-site working conditions according to claim 1 is characterized in that: The annular force sensor is arranged on the top of the push rod.

7. The overhead catenary hanger string fatigue test device simulating actual on-site working conditions according to claim 6 is characterized in that: The displacement measuring piece is arranged between the annular force sensor and the motor.

8. The overhead catenary hanger string fatigue test device simulating actual on-site working conditions according to claim 2 is characterized in that: The laser displacement sensor is arranged on the base.

9. The overhead catenary hanger string fatigue test device simulating actual on-site working conditions according to claim 1 is characterized in that: The motor is a linear motor.

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