CN215492932U

CN215492932U - Bus expansion joint fatigue test device

Info

Publication number: CN215492932U
Application number: CN202121536780.3U
Authority: CN
Inventors: 陶敬海; 马彪; 金伟; 邓加华; 卢琰羽; 潘宙; 刘勇; 魏荣合; 陈飞; 李其
Original assignee: Nanjing Guodian Power Fittings Quality Inspection And Testing Center Co ltd
Current assignee: Nanjing Guodian Power Fittings Quality Inspection And Testing Center Co ltd
Priority date: 2021-07-07
Filing date: 2021-07-07
Publication date: 2022-01-11
Anticipated expiration: 2031-07-07

Abstract

The utility model provides a bus expansion joint fatigue test device which comprises a test bed and an electrical control box, wherein the test bed comprises a support platform, a plurality of test arms for testing expansion joints are arranged on the support platform, the test arms are distributed along the circumferential direction of the test bed, a rotatable eccentric cam is arranged at the center of the support platform, one end of each expansion joint is connected to the eccentric cam, and the other end of each expansion joint is connected to one end, far away from the support platform, of the test arm. The device can operate according to relevant parameters specified in the standard, so that the bus expansion joint can be tested to verify the fatigue stress bearing capacity of the bus expansion joint.

Description

Bus expansion joint fatigue test device

Technical Field

The utility model relates to the technical field of testing, in particular to a bus expansion joint fatigue test device.

Background

The bus expansion joint is a hardware fitting used for compensating expansion of a bus caused by temperature change. The bus expansion joint is generally formed by stacking copper/aluminum foil into a section the same as that of the bus and welding wiring boards at two ends. The expansion joint can bear fatigue alternating stress in the operation process of equipment, after repeated stress, the expansion joint can generate fatigue, cracks can be generated at the welding seam of the expansion joint after certain circulation is reached, and then the expansion joint can expand until the expansion joint is broken. Before the fracture, because the influence of crackle, its overcurrent capacity descends, can appear safety hazards such as local high temperature.

The national standard GB/T2317.1-2008 'mechanical test of electric power fitting part 1' stipulates that a bus expansion joint needs to be subjected to a fatigue test, the expansion amount is required to be controlled to be 32mm, and 1000 times of tests are carried out at the round-trip frequency of 40 times/h-60 times/h. The test requires extremely low test frequency, so that the test has certain implementation difficulty, and no organization has the ability to carry out the detection in the industry at present, and the test belongs to the market blank.

Disclosure of Invention

In order to overcome the defects of the prior art, the utility model provides a bus expansion joint fatigue test device which can operate according to relevant parameters specified in a standard, so that the bus expansion joint can be tested to verify the fatigue stress bearing capacity of the bus expansion joint.

In order to achieve the purpose, the bus telescopic joint fatigue test device comprises a test bed and an electrical control box, wherein the test bed comprises a support platform, a plurality of test arms for testing telescopic joints are arranged on the support platform and are distributed along the circumferential direction of the test bed, a rotatable eccentric cam is arranged at the center of the support platform, one end of each telescopic joint is connected to the eccentric cam, and the other end of each telescopic joint is connected to one end, far away from the support platform, of each test arm.

Furthermore, one end, far away from the support platform, of the testing arm is provided with a first locking device, the testing arm is provided with a linear guide rail extending along the length direction of the testing arm, a sliding block is arranged on the linear guide rail and can slide along the linear guide rail, a second locking device is arranged on the sliding block, and two ends of the telescopic joint are connected to the first locking device and the second locking device respectively.

Furthermore, the slider is rotatably connected with a connecting rod, and one end of the connecting rod, which is far away from the slider, is rotatably connected to the eccentric cam.

Further, 4 test arms are arranged, 1 group of 2 test arms are symmetrically distributed on two sides of the test bed, and an included angle between the 1 group of 2 test arms and the 1 group of 2 test arms is smaller than 90 degrees.

Further, the eccentricity of the eccentric cam is 32mm, and the rotational speed of the eccentric cam is 1 RPM.

Furthermore, the bottom of the support platform is provided with a support frame, the bottom of the support platform is provided with a direct current motor used for driving the eccentric cam, the output end of the direct current motor is connected with a speed reducer, and the output end of the speed reducer is connected to the eccentric cam and drives the eccentric cam to move.

Furthermore, an alternating current-direct current converter is arranged in the electric control box, the alternating current-direct current converter is connected to an external alternating current power supply, the direct current motor is connected to the alternating current-direct current converter, and a control circuit is arranged between the alternating current-direct current converter and the power supply.

Furthermore, the control circuit comprises a start button, a stop button, an emergency stop switch, an alternating current contactor and an electronic counter, the start button, the stop button, the emergency stop switch and the alternating current contactor are connected in series on an electric control loop of the control circuit, an output relay of the electronic counter is connected to a normally closed electric shock of the alternating current contactor, the electronic counter is set to count for 1000 times and then outputs, and the alternating current contactor is cut off to disconnect the direct current motor to stop running.

The bus expansion joint fatigue test device can operate according to relevant parameters specified in the standard, so that the bus expansion joint can be tested, and the fatigue stress bearing capacity of the bus expansion joint can be verified.

Drawings

The present invention will be further described and illustrated with reference to the following drawings.

FIG. 1 is a top view of a bus expansion joint fatigue testing apparatus in accordance with a preferred embodiment of the present invention;

FIG. 2 is a side view of a bus expansion joint fatigue testing apparatus in accordance with a preferred embodiment of the present invention;

FIG. 3 is a schematic structural view for embodying an electrical control box;

fig. 4 is a circuit diagram for embodying the control circuit.

Reference numerals: 1. a support table-board; 11. a test arm; 2. a linear guide rail; 31. a first locking device; 32. a second locking device; 4. a slider; 5. a rolling bearing; 6. an eccentric cam; 7. a connecting rod; 8. a support frame; 9. a speed reducer; 101. an electrical control box; 102. a direct current motor; 103. an AC-DC converter; 104. a start button; 105. A stop button; 106. a scram switch; 107. an AC contactor; 108. an electronic counter.

Detailed Description

The technical solution of the present invention will be more clearly and completely explained by the description of the preferred embodiments of the present invention with reference to the accompanying drawings.

As shown in fig. 1 and 2, a bus expansion joint fatigue test device according to a preferred embodiment of the present invention includes a test bed and an electrical control box 101, the test bed includes a support platform, 4 test arms 11 for testing the expansion joint are arranged on the support platform in the circumferential direction, each 2 test arms 11 are 1 group and symmetrically distributed on both sides of the test bed, and an included angle between the 1 group of 2 test arms 11 and the test platform is less than 90 °. This allows the simultaneous testing of 4 sets of test samples.

As shown in fig. 1 and 2, one end of the test arm 11, which is far away from the support platform, is provided with a first locking device 31, the test arm 11 is provided with a linear guide rail 2 extending along the length direction of the test arm, the linear guide rail 2 is provided with a slider 4, the slider 4 can slide along the linear guide rail 2, the slider 4 is provided with a second locking device 32, and two ends of the telescopic joint are respectively connected to the first locking device 31 and the second locking device 32. The slider 4 is connected with a connecting rod 7 in a rotating manner, and one end of the connecting rod 7, which is far away from the slider 4, is connected to the eccentric cam 6 in a rotating manner.

As shown in fig. 1 and 2, a rotatable eccentric cam 6 is disposed at the center of the supporting platform, a supporting frame 8 is disposed at the bottom of the supporting platform, a dc motor 102 for driving the eccentric cam 6 is disposed at the bottom of the supporting platform, an output end of the dc motor 102 is connected to a speed reducer 9, and an output end of the speed reducer 9 is connected to the eccentric cam 6 and drives the eccentric cam to move. The eccentricity of the eccentric cam 6 is 32mm and the rotational speed of the eccentric cam 6 is 1RPM, i.e., 60 revolutions per hour, and each slider 4 reciprocates once per revolution. Thus, the bus expansion joint can be tested according to the national standard with the expansion amount of 32mm and the round-trip frequency of 60 times per hour.

As shown in fig. 3 and 4, an ac/dc converter 103 is provided in the electric control box 101, the ac/dc converter 103 is connected to an external ac power supply, the dc motor 102 is connected to the ac/dc converter 103, and a control circuit is provided between the ac/dc converter 103 and the power supply. The control circuit comprises a start button 104, a stop button 105, an emergency stop switch 106, an alternating current contactor 107 and an electronic counter 108, wherein the start button 104, the stop button 105, the emergency stop switch 106 and the alternating current contactor 107 are connected in series on an electric control circuit of the control circuit, an output relay of the electronic counter 108 is connected with the alternating current contactor 107 to be in a normally closed electric shock state, the electronic counter 108 is set to count for 1000 times and then outputs, and the alternating current contactor 107 is cut off to disconnect the direct current motor 102 to stop running. The test is stopped after 1000 times of round-trip tests, and the capability of bearing fatigue stress can be verified.

The above detailed description merely describes preferred embodiments of the present invention and does not limit the scope of the utility model. Without departing from the spirit and scope of the present invention, it should be understood that various changes, substitutions and alterations can be made herein by those skilled in the art without departing from the spirit and scope of the utility model as defined by the appended claims and their equivalents. The scope of the utility model is defined by the claims.

Claims

1. The utility model provides a generating line telescopic joint fatigue test device, its characterized in that, includes test bench and electrical control box, the test bench includes supporting platform, is equipped with a plurality of test arms that are used for testing the telescopic joint on the supporting platform that shows, the test arm is arranged along the circumference of testboard, supporting platform's center department is equipped with eccentric cam that can rotate, telescopic joint one end is connected on eccentric cam, and the one end that supporting platform was kept away from to the test arm is connected to the other end.

2. The bus expansion joint fatigue test device according to claim 1, wherein a first locking device is arranged at one end of the test arm away from the support platform, a linear guide rail extending along the length direction of the test arm is arranged on the test arm, a sliding block is arranged on the linear guide rail and can slide along the linear guide rail, a second locking device is arranged on the sliding block, and two ends of the expansion joint are respectively connected to the first locking device and the second locking device.

3. The bus bar telescopic joint fatigue test device according to claim 2, wherein a connecting rod is rotatably connected to the slider, and one end of the connecting rod, which is far away from the slider, is rotatably connected to the eccentric cam.

4. The bus bar telescopic joint fatigue test device according to claim 1, wherein 4 test arms are provided, 1 group of 2 test arms are symmetrically distributed on two sides of the test bed, and an included angle between 1 group of 2 test arms is smaller than 90 °.

5. The bus bar expansion joint fatigue test device according to claim 1, wherein the eccentricity of the eccentric cam is 32mm, and the rotation speed of the eccentric cam is 1 RPM.

6. The bus expansion joint fatigue test device according to claim 1, wherein a support frame is arranged at the bottom of the support platform, a direct current motor for driving the eccentric cam is arranged at the bottom of the support platform, a speed reducer is connected to an output end of the direct current motor, and an output end of the speed reducer is connected to the eccentric cam and drives the eccentric cam to move.

7. The bus expansion joint fatigue test device according to claim 6, wherein an AC/DC converter is arranged in the electrical control box, the AC/DC converter is connected to an external AC power supply, the DC motor is connected to the AC/DC converter, and a control circuit is arranged between the AC/DC converter and the power supply.

8. The bus bar telescopic joint fatigue test device according to claim 7, wherein the control circuit comprises a start button, a stop button, an emergency stop switch, an ac contactor and an electronic counter, the start button, the stop button, the emergency stop switch and the ac contactor are connected in series on an electrical control circuit of the control circuit, an output relay of the electronic counter is connected to a normally closed electric contact of the ac contactor, the electronic counter is set to count for 1000 times and then outputs, and the ac contactor is cut off to disconnect the dc motor to stop running.