APM bogie fatigue test device and test method thereof

Abstract

The invention discloses an APM bogie fatigue test device and a test method thereof. The bogie comprises a rotating shaft, an air spring, a torsion beam and a push-pull rod. The test device comprises a bogie mounting and positioning tool and a loading tool, the bogie mounting and positioning tool comprises a main positioning seat and a positioning frame arranged on the main positioning seat, the main positioning seat is provided with an air spring positioning structure and a torsion beam positioning structure, the positioning frame is provided with a push-pull rod positioning structure, and the loading tool is arranged on the loading frame. And the loading tool comprises a loading block connected with the rotating shaft and a group of loading actuation structures corresponding to each loading surface of the loading block. The bogie mounting and positioning tool is integrally supported, so that each fixing point of the bogie can be positioned; meanwhile, loading tests in all directions are achieved through the integrated loading blocks, vertical, transverse and longitudinal load loading can be carried out, cycle can be carried out for more than one million times, and fatigue testing on the large bogie structure of the train is achieved.

Description

Technical Field

[0001] This invention relates to APM (Automated People Mover System), which uses pneumatic rubber tires and wheels. It is an unmanned, automated, grade-separated mass transit system and a type of urban rail transit line. Specifically, this invention relates to the field of fatigue testing technology for APM vehicle bogies, and in particular to an APM bogie fatigue testing device and its testing method. Background Technology

[0002] With the development of urban rail transit, vehicle speeds are increasing and operating mileage is growing, making the issue of vehicle structural fatigue safety increasingly important, especially for major load-bearing components such as axles and suspensions (collectively known as the bogie system) during train operation. The bogie system simultaneously bears vertical impact forces from the track, lateral sway forces from the car body, and longitudinal forces from the acceleration and braking of the wheels, resulting in a very complex stress distribution.

[0003] Existing testing equipment can only conduct fatigue tests on the bogie frame of subways with steel wheels and rails. It cannot conduct fatigue tests on the entire bogie system, including the air spring suspension system and traction mechanism. It can only use independent excitation devices to load each stress-bearing part of the bogie frame separately. The loading blocks and loading drive structures are relatively numerous, the structure is complex, and the test operation is cumbersome. For example, the fatigue vibration strength test bench for railway engineering vehicle bogies disclosed in patent CN 218674276U includes a gantry frame installed on a dedicated bogie test site, a vertical hydraulic loading device, a dummy axle, an axial hydraulic loading device, a secondary lateral excitation device, a longitudinal traction excitation device, an anti-snake excitation device, and a gearbox suspension rod excitation device.

[0004] Because the structure of the APM bogie differs significantly from that of existing subway bogies, existing technologies cannot be used to conduct fatigue tests on the entire APM bogie system. They cannot simultaneously apply loads in multiple directions, and the loading force and accuracy are limited. Furthermore, there is a lack of existing reference standards for APM bogie fatigue testing devices and methods. Therefore, it is necessary to invent a device and testing method that can test the entire APM bogie (including axles, air spring suspension system, traction mechanism, etc.). Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an APM bogie fatigue testing device and its testing method, which has a simple structure and can meet the loading requirements of various loads.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] A fatigue testing device for an APM bogie, the bogie comprising a shaft, a gas spring, a torsion beam, and a push-pull rod; the testing device comprising a bogie mounting and positioning fixture and a loading fixture, the bogie mounting and positioning fixture comprising a main positioning seat and a positioning frame disposed on the main positioning seat, the main positioning seat being provided with a gas spring positioning structure and a torsion beam positioning structure, the positioning frame being provided with a push-pull rod positioning structure, and the loading fixture comprising a loading block for connection with the shaft and a set of loading actuation structures corresponding to each loading surface of the loading block.

[0008] The bogie installation and positioning fixture includes a bottom platform and a gantry frame mounted on the bottom platform. The bogie installation and positioning fixture is fixed on the bottom platform, and a set of loading actuation structures are respectively mounted on the bottom platform and the gantry frame.

[0009] The main positioning seats include two arranged side by side, with the front main positioning seat having a gas spring mounting point and a torsion beam mounting point, and the positioning frame fixed on the rear main positioning seat.

[0010] The positioning frame is a frame structure, with a longitudinal push-pull rod mounting point located at the top and a V-shaped push-pull rod mounting point located at the bottom.

[0011] The loading fixture includes an integrated loading block for connection with a rotating shaft, and the integrated loading block is connected to a set of loading actuation structures.

[0012] The set of loading actuation structures includes a vertical loading actuation structure, a horizontal loading actuation structure, and a longitudinal loading actuation structure; the vertical loading actuation structure, the horizontal loading actuation structure, and the longitudinal loading actuation structure are all connected to the loading surface corresponding to the integrated loading block.

[0013] The upper part of the integrated loading block is a square structure, and each side of the square structure forms a loading surface. The lower part of the loading block has a connecting hole that connects to the rotating shaft.

[0014] The integrated loading block has a connector on its loading surface, which is hinged to the corresponding loading actuation structure.

[0015] The top of the bogie is provided with a set of guide wheels, and the loading fixture includes a limiting structure disposed between adjacent guide wheels to limit the rotation of the guide wheels.

[0016] A method for conducting fatigue testing using the aforementioned bogie fatigue testing apparatus includes the following steps:

[0017] First, the bogie installation and positioning fixture is fixed on the laboratory foundation, and the bogie sample is fixed through its multiple interfaces; then, the multi-directional loading fixture is assembled and connected to the bogie sample, and the air springs of the bogie system are inflated to the specified height; finally, the equipment is gradually started for debugging, and the loading test is carried out according to the test outline.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] The APM bogie fatigue testing device and its testing method are reasonably designed. The bogie installation and positioning fixture provides overall support, which can locate each fixed point of the bogie. At the same time, the integrated loading block can realize loading tests in various directions, and can carry out vertical, lateral and longitudinal load loading. It can withstand more than 2 million cycles, realize fatigue testing of the overall structure of the APM bogie, and can more accurately simulate and evaluate the impact of air spring suspension on the fatigue strength of the bogie structure. Attached Figure Description

[0020] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:

[0021] Figure 1 This is a schematic diagram of the mounting bracket for the present invention.

[0022] Figure 2 This is a schematic diagram of the mounting bracket fixing interface of the present invention.

[0023] Figure 3 This is a schematic diagram of the overall positioning of the bogie system of the present invention.

[0024] Figure 4 This is a schematic diagram of the multi-directional loading block of the present invention.

[0025] Figure 5 This is a schematic diagram of the multi-directional loading fixture of the present invention.

[0026] Figure 6 This is a schematic diagram of the loading block of the present invention.

[0027] Figure 7 and Figure 8 This is a schematic diagram of the overall loading of the present invention.

[0028] Figure 9 This is a schematic diagram of the vertical load distribution on both the left and right wheels of the present invention.

[0029] Figure 10 This is a schematic diagram of the anti-phase loading waveforms on the left and right sides of the present invention.

[0030] Figure 11 This is a schematic diagram of the in-phase loading waveforms on both sides of the present invention.

[0031] In the picture:

[0032] 1. Rear main positioning seat, 2. Front main positioning seat, 3. Thrust rod fixing frame, 4. Longitudinal push-pull rod mounting point, 5. V-shaped push-pull rod mounting point, 6. Torsion beam mounting point, 7. Gas spring mounting point, 8. Torsion beam side mounting point, 9. Loading block. Detailed Implementation

[0033] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and through the description of the examples.

[0034] like Figures 1 to 11 As shown, the APM bogie includes a pivot, air spring, torsion beam, and push-pull rods; the push-pull rods include longitudinal push-pull rods and V-shaped push-pull rods, and a set of guide wheels is provided on the top of the bogie; the set of guide wheels includes a pair of front guide wheels located at the front and a pair of rear guide wheels located at the rear, with gaps between the pair of front guide wheels and between the pair of rear guide wheels.

[0035] The APM bogie fatigue testing device includes a bogie installation and positioning fixture and a loading fixture. The bogie installation and positioning fixture includes a main positioning seat and a positioning frame on the main positioning seat. The main positioning seat is equipped with a gas spring positioning structure and a torsion beam positioning structure, and the positioning frame is equipped with a push-pull rod positioning structure. Through the overall support of the bogie installation and positioning fixture, the various fixed points of the bogie can be positioned.

[0036] The loading fixture includes a loading block for connection to the shaft and a set of loading actuation structures corresponding to each loading surface of the loading block. The set of loading actuation structures includes vertical, lateral, and longitudinal loading actuation structures; all three are connected to the loading surfaces corresponding to the integrated loading block. Using the integrated loading block, loading tests in various directions can be performed, enabling vertical, lateral, and longitudinal load loading, and withstanding over 2 million cycles, thus achieving fatigue testing of the APM bogie structure.

[0037] The bogie installation and positioning fixture includes a bottom platform and a gantry frame set on the bottom platform. The gantry frames are a pair arranged opposite each other, with one gantry frame set on the end of the shaft on one side and the other gantry frame set on the end of the shaft on the other side. The bogie installation and positioning fixture is fixed on the bottom platform, and a set of loading actuation structures are respectively set on the bottom platform and the gantry frame.

[0038] The main positioning seats include two arranged side by side. The front main positioning seat 2, located at the front, has a gas spring mounting point 7 and a torsion beam mounting point, which are mounting holes on the main positioning seat. The torsion beam mounting point includes a torsion beam mounting point 6 located on the top of the main positioning seat and a torsion beam side mounting point 8 located on the side of the main positioning seat. The positioning frame is fixed to the rear main positioning seat 1 located at the rear. The top of the main positioning seat is a flat plate structure, which can reliably support and position the gas spring.

[0039] The positioning frame is a frame structure, forming a push rod fixing frame 3; the frame structure is provided with a longitudinal push-pull rod mounting point 4 located at the top and a V-shaped push-pull rod mounting point 5 located at the bottom, and this mounting point is a support lug structure; integrated setting, compact structure.

[0040] The loading fixture includes an integrated loading block for connection to a rotating shaft, and the integrated loading block is connected to a set of loading actuation structures. For example... Figure 4 and Figure 5 As shown, this APM bogie fatigue testing device is equipped with a set of loading actuation structures at the end of each side shaft, and the loading actuation structures on both sides are symmetrically arranged.

[0041] The upper part of the integrated loading block 9 has a square structure, with each side forming a loading surface. The lower part of the loading block has a connecting hole for connection with the rotating shaft. Specifically, the integrated loading block is a hollow structure welded from steel plates; it has a simple structure and reliable strength.

[0042] The integrated loading block has a connector on its loading surface, which is hinged to the corresponding loading actuation structure. The lateral loading actuation structure is fixed to the platform by an actuation auxiliary bracket; the vertical loading actuation structure is fixed to the top beam of the gantry; and the longitudinal loading actuation structure is fixed to the vertical column of the gantry. The integrated design results in a compact structure.

[0043] like Figure 7 and Figure 8 As shown, the loading fixture includes a limiting structure disposed between adjacent guide wheels to limit the rotation of the guide wheels; a gantry is set on the platform, the top of the gantry is a gantry beam, a limiting block is provided on the gantry beam, the limiting block is located between an adjacent pair of guide wheels, and the outer side of the limiting block contacts the corresponding guide wheel; furthermore, the limiting frame is connected to the guide wheels to provide the accuracy of the test results and the reliability of the test.

[0044] This invention provides a bogie fatigue testing method, which utilizes the aforementioned bogie fatigue testing device to conduct fatigue tests; the testing method includes the following steps:

[0045] First, the bogie installation and positioning fixture is fixed on the laboratory foundation, and the bogie sample is fixed through its multiple interfaces; then, the multi-directional loading fixture is assembled and connected to the bogie sample, and the air springs of the bogie system are inflated to the specified height; finally, the equipment is gradually started for debugging, and the loading test is carried out according to the test outline.

[0046] Static strength tests were conducted, including three test conditions: vertical load, lateral load, and longitudinal load. The vertical load test was conducted in two scenarios: equal load on both wheels and eccentric load on both wheels. During the lateral and longitudinal load tests, a certain value of vertical load was simultaneously applied to simulate the pressure of the vehicle's own weight.

[0047] Fatigue tests were conducted, including three test conditions: vertical load, lateral load, and longitudinal load. Each test condition underwent 2 million cycles at a loading frequency of 2 cycles / second. The fatigue loads were applied in two ways: in-phase loading and out-of-phase loading for the left and right wheels. Out-of-phase loading was further categorized as follows: Figure 10 As shown, the in-phase loading waveform is as follows Figure 11 As shown.

[0048] The fatigue testing device and method for APM bogies of this invention are reasonably designed. The bogie installation and positioning fixture provides overall support, which can locate each fixed point of the bogie. At the same time, the integrated loading block realizes loading tests in various directions, which can carry out vertical, lateral and longitudinal load loading and can withstand more than 2 million cycles, so as to realize fatigue testing of the overall structure of APM bogies.

[0049] The above description is merely an illustration of preferred embodiments of the present invention, and the above technical features can be arbitrarily combined to form multiple embodiments of the present invention.

[0050] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the concept and technical solution of the present invention, or the direct application of the concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. An APM bogie fatigue test device, the bogie comprising a rotating shaft, an air spring, a torsion beam and a push-pull rod; the test device comprising a bogie mounting positioning tool and a loading tool, characterized in that: The bogie mounting positioning tool comprises a main positioning seat and a positioning frame arranged on the main positioning seat, the main positioning seat is provided with air spring positioning structure and torsion beam positioning structure, the positioning frame is provided with push-pull rod positioning structure, the loading tool comprises a loading block connected with the rotating shaft and a set of loading actuating structures corresponding to each loading surface of the loading block.

2. The APM bogie fatigue test rig of claim 1, wherein: The bogie mounting positioning tool comprises a bottom platform and a gantry arranged on the bottom platform, the bogie mounting positioning tool is fixed on the bottom platform, and a set of loading actuating structures are arranged on the bottom platform and the gantry respectively.

3. The APM bogie fatigue test rig of claim 1, wherein: The main positioning seat comprises two main positioning seats arranged side by side in front and back, the main positioning seat located in front is provided with air spring mounting points and torsion beam mounting points, and the positioning frame is fixed on the main positioning seat located in back.

4. The APM bogie fatigue test apparatus of claim 1, wherein: The positioning frame is a frame structure, the frame structure is provided with a longitudinal push-pull rod mounting point located above and a V-shaped push-pull rod mounting point located below.

5. The APM bogie fatigue test rig of claim 2, wherein: The loading tool comprises an integrated loading block connected with the rotating shaft, and the integrated loading block is connected with a set of loading actuating structures.

6. The APM bogie fatigue test rig of claim 5, wherein: The set of loading actuating structures comprises vertical loading actuating structures, horizontal loading actuating structures and longitudinal loading actuating structures; the vertical loading actuating structures, the horizontal loading actuating structures and the longitudinal loading actuating structures are connected with the corresponding loading surface of the integrated loading block.

7. The APM bogie fatigue test rig of claim 6, wherein: The upper part of the integrated loading block is a square structure, each side of the square structure forms a loading surface, and the lower part of the loading block is provided with a connecting hole connected with the rotating shaft.

8. The APM bogie fatigue test rig of claim 7, wherein: The integrated loading block is provided with a connecting head on the loading surface, and the connecting head is connected with the corresponding loading actuating structure through hinged connection.

9. The APM bogie fatigue test apparatus of claim 1, wherein: The top of the bogie is provided with a set of guide wheels, and the loading tool comprises a limiting structure arranged between adjacent guide wheels for limiting the rotation of the guide wheels.

10. A method of performing a fatigue test using the bogie fatigue test apparatus according to any one of claims 1 to 9, characterized by: The method comprises the following steps: Firstly, the bogie mounting positioning tool is fixed on the test room foundation, and the bogie sample is fixed through the multiple interfaces of the bogie mounting positioning tool; then, the multi-directional loading tool is assembled and connected with the bogie sample, the air spring of the bogie system is inflated to a specified height; finally, the equipment is gradually started, and the loading test is carried out according to the test outline.

Images