CN-122016303-A - Traction pull rod bidirectional loading test device and method

CN122016303ACN 122016303 ACN122016303 ACN 122016303ACN-122016303-A

Abstract

The present disclosure provides a traction link bi-directional loading test apparatus and method, the apparatus including an upstanding support frame, a loader, an adjustment plate, a sensor assembly, and a guide. The guide device comprises two upright guide posts, a lower connecting component and an upper connecting component. Two upright guide posts are secured to the base plate. The lower link assembly is configured to connect a first lifting lug of an upstanding pull rod located between the two guide posts to a lower portion of the two guide posts. The upper portion of the upper link assembly is connected to the adjustment plate, the lower portion is connected to the second shackle, and the two guide posts slidably pass through the upper link assembly. The transverse displacement of the upper connecting component is rigidly restrained through the guide post, so that the load applied by the loader is transmitted along the axis of the traction pull rod, and accurate stretching and compression bidirectional loading is realized.

Inventors

LI CHUNCHAO
MA LIYING
WANG WEIHUA
Yan Zhongkui

Assignees

中车青岛四方机车车辆股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260112

Claims (13)

1. The traction pull rod bidirectional loading test device is characterized by comprising a pull rod main body, a first lifting lug and a second lifting lug, wherein the first lifting lug and the second lifting lug are arranged at two ends of the pull rod main body, and the test device comprises: An upstanding support frame including a relatively fixed base plate and top plate; a loader connected below the top plate; the adjusting plate is horizontally arranged below the loader; a sensor assembly having both ends connected to the loader and the adjustment plate, respectively, for measuring a force exerted by the loader on the adjustment plate, and A guide device, comprising: Two upright guide posts fixed to the base plate; A lower link assembly configured to link a first lifting lug of an upstanding drag link between two of the guide posts to a lower portion of the two guide posts, and And the upper connecting assembly is connected with the adjusting plate at the upper part, the second lifting lug at the lower part, and the two guide posts slidably penetrate through the upper connecting assembly and the adjusting plate.
2. The test device of claim 1, wherein the upper connection assembly comprises: two transverse sleeves, each having a mounting hole adapted to receive one end of the first shackle, and And two force application assemblies connected between the two transverse sleeves and the adjusting plate, and each guide post slidably passes through the transverse sleeves and the force application assemblies.
3. The test device of claim 2, wherein each of the force application assemblies comprises: An upright sleeve extending upward from the transverse sleeve through the adjusting plate, and provided with a boss protruding radially outward and abutting against the lower surface of the adjusting plate, and A fastening mechanism releasably mounted at the end of the upstanding sleeve extending beyond the adjustment plate, the adjustment plate being adapted to lift or depress the upstanding sleeve and the transverse sleeve by cooperation with the fastening mechanism or boss.
4. A test device according to claim 3, wherein the fastening means comprises a fastener provided with internal threads, which is threadedly engaged with the end of the upstanding sleeve and abuts against the upper surface of the adjustment plate.
5. The test device of any one of claims 1-4, further comprising a securing plate removably secured over the base plate, the securing plate being connected to a lower end of the guide.
6. The test device of claim 5, wherein the base plate is provided with a recess, and further comprising a stopper disposed in the recess, the stopper passing through the fixing plate and fixing the fixing plate to the base plate.
7. The test device of claim 6, wherein the lower connection assembly comprises two lower sleeves respectively sleeved on the guide posts, each lower sleeve being configured with one end abutting against the fixed plate and the other end abutting against the lower surface of the second lifting lug.
8. The test device of claim 7, wherein the lower connection assembly further comprises two upper sleeves respectively sleeved on the guide posts, and each upper sleeve is in threaded fit with the guide post and abuts against the upper surface of the second lifting lug.
9. The test device of claim 1, wherein the sensor assembly comprises a sensor, a first connection portion and a second connection portion, one end of the sensor is detachably connected to the loader through the first connection portion, and the other end of the sensor is detachably connected to the adjusting plate through the second connection portion.
10. The test device of claim 1, wherein the loader is a hydraulic ram.
11. The test device of claim 1, wherein at least one strain gauge is attached to the pull rod body, the strain gauge being configured to measure deformation of the pull rod body during loading.
12. A method of testing bi-directional loading of a traction link, using a test apparatus according to any one of claims 1 to 11, the method comprising the steps of: s1, installing the traction pull rod in the test device, and adjusting the positions of the adjusting plate, the upper connecting assembly and the traction pull rod to align the positions with the vertical guide column so as to establish an axial loading path along the vertical direction; s2, controlling the loader to apply tension and/or compression force to the traction pull rod along the axial direction of the guide post; s3, measuring and recording an applied load value through the sensor assembly in the loading process; And S4, acquiring one or more performance parameters of the traction pull rod under the load based on the load value and the corresponding test setting.
13. The test method according to claim 12, wherein the step S4 is to obtain a correspondence between the load value and the strain signal outputted from the strain gauge to establish a load-strain curve of the traction rod or calculate a strain coefficient.

Description

Traction pull rod bidirectional loading test device and method Technical Field The disclosure relates to the technical field of railway vehicles, in particular to a device and a method for loading a traction pull rod of a railway vehicle. Background The traction pull rod is a key stress component in the running part of the railway vehicle, two ends of the traction pull rod are respectively connected with the vehicle body and the bogie, and the core function is to efficiently and reliably transfer traction force and braking force generated by the bogie to the vehicle body so as to drive the train to run or control the train to stop at a reduced speed. As a core load bearing component related to driving safety, the mechanical property of the traction pull rod is very important. Therefore, it is necessary to develop a mechanical property loading test of the system to verify whether the structural strength, fatigue life and rigidity characteristics meet the design and safety standards. However, to dampen vibration and shock during operation, the two ends of the traction link are typically flexibly connected to the metal lifting lugs by rubber nodes. The rubber material can generate transverse expansion deformation when being pressed, so that the nominal pressure applied by the test device can not be tightly transmitted along the theoretical axis of the traction pull rod, and partial load is decomposed into an useless transverse component force. The axial pressure actually born by the traction pull rod body is difficult to accurately control and measure, and the accuracy and reliability of the pressure loading test result are affected. Disclosure of Invention To solve at least one technical problem of the above and other aspects in the related art, the present disclosure provides a traction pull rod bidirectional loading test device, the traction pull rod includes a pull rod main body and first and second lifting lugs mounted at two ends of the pull rod main body. The test device comprises an upright support frame, a loader, an adjusting plate, a sensor assembly and a guide device. An upstanding support frame includes a relatively fixed bottom plate and top plate. The loader is connected below the top plate. The regulating plate is horizontally arranged below the loader. The sensor assembly is connected at both ends to the loader and the adjustment plate, respectively, to measure the force exerted by the loader on the adjustment plate. The guide device comprises two upright guide posts, a lower connecting component and an upper connecting component. Two upright guide posts fixed to the base plate. The lower link assembly is configured to connect a first lifting lug of an upstanding pull rod located between the two guide posts to a lower portion of the two guide posts. The upper portion of the upper link assembly is connected to the adjustment plate, the lower portion is connected to the second shackle, and the two guide posts slidably pass through the upper link assembly and the adjustment plate. According to an embodiment of the present disclosure, the upper connection assembly includes two transverse sleeves and two force application assemblies. Each transverse sleeve has a mounting hole adapted to receive one end of a first shackle. Two force applying assemblies are connected between the two transverse sleeves and the adjustment plate, and each guide post slidably passes through the transverse sleeves and the force applying assemblies. According to an embodiment of the present disclosure, each force application assembly includes an upstanding sleeve and a fastening mechanism. The upright sleeve extends upwards from the transverse sleeve to pass through the adjusting plate, and a boss protruding outwards in the radial direction and abutting against the lower surface of the adjusting plate is arranged on the outer side of the upright sleeve. A fastening mechanism releasably mounted at the end of the upstanding sleeve extending beyond the adjustment plate, the adjustment plate being adapted to lift or depress the upstanding sleeve and the transverse sleeve by cooperation with the fastening mechanism or boss. According to an embodiment of the present disclosure, the fastening mechanism includes a fastener provided with internal threads, which is threadedly engaged with the end of the upstanding sleeve and abuts against the upper surface of the adjustment plate. According to an embodiment of the present disclosure, the guide device further comprises a fixing plate detachably fixed above the bottom plate, and the fixing plate is connected with the lower end of the guide device. According to an embodiment of the present disclosure, the bottom plate is provided with a recess, and the test device further includes a stopper provided in the recess, penetrating the fixing plate, and fixing the fixing plate to the bottom plate. According to an embodiment of the present disclosure, the lower connection assembly includes tw