Excitation test bench and excitation test device

Abstract

The application relates to the field of bogie testing, in particular to a vibration excitation test bench and a vibration excitation test device. The vibration excitation test bench comprises two groups of test mechanisms, any one group of test mechanisms comprises a motor, a synchronous gear box, a variable speed gear box and a track wheel device, the track wheel device comprises two track wheels, the motor of any one group is connected with the first end of the synchronous gear box, the second end of the synchronous gear box is connected with the first end of the variable speed gear box, the second end of the variable speed gear box is connected with the two track wheels to drive the two track wheels to rotate, the third end of the synchronous gear box is connected with the third end of the synchronous gear box of the other group, the outer edge of the track wheel is a polygon, and the polygon is distributed with a sine wave. According to the vibration excitation test bench and the vibration excitation test device, the problem that the existing vibration excitation test bench can realize the synchronization of the front and rear two shafts of the bogie, has low precision and cannot realize high-frequency vibration under the power test condition is solved.

Description

Technical Field

[0001] This application relates to the field of bogie testing, and in particular to a vibration testing rig and a vibration testing device. Background Technology

[0002] With the continuous increase in the speed and operating mileage of high-speed trains, more and more structural quality problems are being exposed. The root cause is the impact of vibration damage, with high-frequency vibration being a major factor leading to structural failure. Current research on dynamic response characteristics under high-frequency excitation input conditions mainly focuses on individual components, which cannot meet the experimental verification requirements for high-frequency vibration during the forward design process of bogies. Therefore, a high-frequency vibration test bench for bogies is of great significance for the forward design of bogies and their components in a high-frequency vibration environment and for solving quality problems caused by high-frequency vibration of bogies.

[0003] In response, existing test benches mainly adopt a structure of motor + gearbox + track wheel, and realize the synchronization of the front and rear axles of the bogie through electrical synchronization. However, the electrical synchronization accuracy of the above method is low; and the outer edge of the track wheel is circular, which does not have a good excitation frequency effect, and cannot achieve high-frequency excitation under power test conditions, thus affecting the test results. Summary of the Invention

[0004] The purpose of this application is to provide a vibration test bench and vibration test device, thereby solving the problems of low accuracy in synchronizing the front and rear axles of the bogie and the inability to achieve high-frequency vibration under power test conditions in existing vibration test benches.

[0005] According to a first aspect of this application, a vibration test bench is provided, the vibration test bench comprising two sets of test mechanisms, each set of test mechanisms comprising a motor, a synchronous gearbox, a variable speed gearbox, and a track wheel device, the track wheel device comprising two track wheels, the motor comprising in any set of test mechanisms being connected to a first end of the synchronous gearbox, the second end of the synchronous gearbox being connected to a first end of the variable speed gearbox, the second end of the variable speed gearbox being connected to the two track wheels to drive the two track wheels to rotate, the third end of the synchronous gearbox comprising in one set of test mechanisms being connected to the third end of the synchronous gearbox comprising in the other set of test mechanisms, the outer edge of the track wheel being polygonal, the polygon being distributed in a sine wave pattern.

[0006] In any of the above technical solutions, the excitation frequency is further defined as: f = nN / 60i, where n is the rotational speed of the motor, N is the number of polygons of the track wheel, and i is the total transmission ratio of the synchronous gearbox and the variable speed gearbox.

[0007] In any of the above technical solutions, further, any group of the test mechanisms also includes a first coupling, a second coupling, a third coupling, a fourth coupling, and a fifth coupling. The motor of any group of the test mechanisms is connected to the first end of the synchronous gearbox through the first coupling. The second end of the synchronous gearbox is connected to the first end of the variable speed gearbox through the second coupling. The second end of the variable speed gearbox is connected to one of the track wheels through the third coupling. One of the track wheels is connected to the other track wheel through the fourth coupling. The third end of the synchronous gearbox is connected to the third end of another group of synchronous gearboxes through the second coupling. The axial directions of the second coupling, the third coupling, and the fourth coupling all extend along a first direction. The axial directions of the first coupling and the fifth coupling both extend along a second direction. The first direction is perpendicular to the second direction.

[0008] In any of the above technical solutions, the vibration test bench further includes two sets of tracks, and each set of test mechanisms includes a transmission platform and a first platform. The motor, synchronous gearbox, and speed-changing gearbox of each set of test mechanisms are all disposed on the transmission platform. The transmission platform is slidably connected to one set of tracks and can slide along the second direction on the current track. The two track wheels of each set of test mechanisms are disposed on the first platform. The first platform is slidably connected to the other set of tracks and can slide along the second direction on the current track.

[0009] In any of the above technical solutions, the track wheel device further includes a speed sensor, which is used to detect the speed of the track wheel.

[0010] In any of the above technical solutions, further, any group of the test mechanisms also includes a second platform and a central pin, the second platform is connected to the first platform, both track wheels of any group of the test mechanisms are disposed on the second platform, the central pin passes through the first platform and connects to the second platform, and the second platform can rotate relative to the first platform around the central pin.

[0011] According to a second aspect of this application, a vibration testing apparatus is provided, including the vibration testing bench as described above.

[0012] In any of the above technical solutions, the vibration test device further includes a base with a groove, the vibration test bench is disposed in the groove, and the vibration test device further includes a traction device disposed on the base. The traction device is used to connect the bogie under test so as to move the bogie under test in the second direction.

[0013] In any of the above technical solutions, the traction device further includes a traction cylinder and a tie rod, and the vibration test device further includes a crossbeam, a column, a compression cylinder, and a dummy car body. The bottom of the dummy car body is used to connect the bogie under test. The four wheels of the bogie under test are in contact with the four track wheels. The column is connected to the track, the crossbeam is connected to the column, and the two ends of the compression cylinder are respectively connected to the crossbeam and the top of the dummy car body. The traction cylinder is connected to the end of the dummy car body through the tie rod.

[0014] In any of the above technical solutions, the traction device further includes a traction cylinder and a tie rod, and the vibration test device further includes a rail, which is set on the base. The non-tested bogie of the test vehicle is placed on the rail, and the four wheels of the test bogie are in contact with the four rail wheels. The traction cylinder is connected to the end of the test vehicle through the tie rod.

[0015] According to the vibration test bench and vibration test device of this application, the vibration test bench includes two sets of test mechanisms. Each set of test mechanisms includes a motor, a synchronous gearbox, a variable speed gearbox, and a track wheel device. The track wheel device includes two track wheels. The motor of any set is connected to the first end of the synchronous gearbox, the second end of the synchronous gearbox is connected to the first end of the variable speed gearbox, and the second end of the variable speed gearbox is connected to the two track wheels to drive the two track wheels to rotate. The third end of the synchronous gearbox is connected to the third end of the synchronous gearbox of the other set. The outer edge of the track wheel is polygonal, and the polygon is distributed with sine waves.

[0016] The test bench of this application uses a structure of motor + synchronous gearbox + speed change gearbox + track wheel device to achieve mechanical synchronization of the front and rear axles of the bogie. It has high synchronization accuracy and high reliability. Moreover, the track wheel is processed into a polygonal shape, which can simulate high-frequency excitation under load test, making the test closer to the actual situation.

[0017] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A top view of a vibration test bench according to an embodiment of this application is shown;

[0020] Figure 2 A top view of the traction device and rail according to an embodiment of this application is shown;

[0021] Figure 3 A top view showing a portion of the structure of the vibration testing apparatus according to an embodiment of this application;

[0022] Figure 4 A schematic diagram illustrating the testing process of a vehicle under test according to an embodiment of this application is shown;

[0023] Figure 5 A schematic diagram illustrating the bogie testing process according to an embodiment of this application is shown;

[0024] Figure 6 A side view of a vibration test bench according to an embodiment of this application is shown;

[0025] Figure 7 A schematic diagram of the track wheel device according to an embodiment of this application is shown;

[0026] Figure 8 A schematic diagram showing the outer edge profile of a track wheel according to an embodiment of this application.

[0027] Icons: 1-Rail; 2-Transmission platform; 3-Motor; 4-First coupling; 5-Synchronous gearbox; 6-Second coupling; 7-Speed ​​change gearbox; 8-Third coupling; 9-Lubrication mechanism; 10-Rail wheel assembly; 11-Fourth coupling; 12-First platform; 13-Second platform; 14-Angle adjustment mechanism; 15-Traction device; 16-Tie rod; 17-Test vehicle; 18-Guide rail; 19-Rail; 20-T-slot plate; 21-Cooling weight; 22-Test bogie; 23-Dummy car body; 24- 25-Compressor cylinder; 26-Gantry frame; 27-Speed ​​sensor bracket; 28-Speed ​​sensor; 29-Speed ​​measuring gear flange; 101-Mounting base; 102-Bearing housing; 103-Rail wheel; 104-Sensor; 151-Mounting base plate; 152-Traction base; 153-Traction cylinder; 154-Hydraulic station; 231-Dummy car frame; 232-Vertical beam; 233-Connecting rod; 234-Mounting bracket; 251-Mounting base; 252-Column; 253-Connecting beam; 254-Crossbeam. Detailed Implementation

[0028] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0029] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0030] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0031] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0032] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0033] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0034] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0035] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0036] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0037] This application provides a vibration test bench and vibration test device, thereby solving the problems of low accuracy in synchronizing the front and rear axles of the bogie achieved by existing vibration test benches, and the inability to achieve high-frequency vibration under power test conditions.

[0038] With the continuous increase in the speed and operating mileage of high-speed trains, more and more structural quality problems are being exposed. The root cause is the impact of vibration damage, with high-frequency vibration being a major factor leading to structural failure. Current research on dynamic response characteristics under high-frequency excitation input conditions mainly focuses on individual components, which cannot meet the experimental verification requirements for high-frequency vibration during the forward design process of bogies. Therefore, a high-frequency vibration test bench for bogies is of great significance for the forward design of bogies and their components in a high-frequency vibration environment and for solving quality problems caused by high-frequency vibration of bogies.

[0039] Prior to this application, existing test benches mainly adopted a structure of motor + gearbox + track wheel, which achieved synchronization of the front and rear axles of the bogie through electrical synchronization. However, the electrical synchronization accuracy of the above method is low; and the outer edge of the track wheel is circular, resulting in poor excitation frequency effect, making it impossible to achieve high-frequency excitation under power test conditions, thus affecting the test results.

[0040] In view of this, according to the first aspect of this application, a vibration test bench is provided, which includes two sets of test mechanisms. Each set of test mechanisms includes a motor 3, a synchronous gearbox 5, a variable speed gearbox 7, and a track wheel device 10. The track wheel device 10 includes two track wheels 103. The motor 3 of any set is connected to the first end of the synchronous gearbox 5, the second end of the synchronous gearbox 5 is connected to the first end of the variable speed gearbox 7, and the second end of the variable speed gearbox 7 is connected to the two track wheels 103 to drive the two track wheels 103 to rotate. The third end of the synchronous gearbox 5 is connected to the third end of the synchronous gearbox 5 of the other set. The outer edge of the track wheel 103 is polygonal, and the polygon is distributed with a sine wave.

[0041] The test bench of this application achieves mechanical synchronization of the front and rear axles of the bogie through a structure of motor 3 + synchronous gearbox 5 + speed change gearbox 7 + track wheel device 10. This results in high synchronization accuracy and reliability. Furthermore, the track wheel 103 is machined into a polygonal shape to simulate high-frequency vibration under load testing, making the test closer to actual conditions. In addition, the polygonal shape of the track wheel 103 can also support (simulate) a large-mass high-speed train. The specific structure of the vibration test bench and the vibration test device, as well as the test process, will be described in detail below.

[0042] In the embodiments of this application, such as Figure 8 As shown, the outer edge of the track wheel 103 is a polygon, and the polygon is distributed with a sinusoidal wave. When the number of polygons in the track wheel 103 is constant, the relationship between the motor speed and the excitation frequency is as follows:

[0043] f = nN / 60i (where f is the excitation frequency, Hz; n is the rotational speed of motor 3, r / min; i is the total transmission ratio of synchronous gearbox 5 and variable speed gearbox 7; N is the number of sides of the polygon of track wheel 103). Furthermore, based on the above formula, various scenarios can be simulated according to requirements.

[0044] For example, the frequency-excited vibration test bench of this application is used to simulate the high-mass, high-frequency, and large-amplitude excitation conditions unique to high-speed trains. Related research and experiments on bogies under full-frequency domain excitation can be conducted on the test bench. Specifically, by controlling experimental variables (excitation roller roughness, polygon order, etc.), the operating conditions of the vehicle track can be reproduced, allowing for the study of the impact of defects such as wheel polygons and track corrugation on various vehicle components. It reproduces the vibration and stress effects of the bogie system under different operating speeds, different loading conditions, track defects, vehicle faults, and wheel wear (polygonal patterns, scratches), establishing a mapping relationship with the actual vehicle operating state, enabling rapid diagnosis of vehicle and track faults.

[0045] (1) Test the overall working mode of the bogie (test frequency range 0-1200Hz) to match the line disturbance under the operation conditions and realize the positive design of the bogie under high frequency vibration conditions; (2) High frequency impact test (P1 force frequency is 500-1200Hz, a series of transient impacts such as turnout, rail gap, wheel abrasion) under the flutter and stress response of the cantilever structure of the bogie braking, traction, gearbox hanger, etc.; (3) Study the stress response of the bogie system under the action of P2 force (P2 force frequency is 20Hz-100Hz, track irregularity and wheel circumferential non-roundness may cause P2 resonance of the wheel-rail system); (4) Test the self-vibration characteristics of the suspension system and the vibration transmission relationship under high frequency disturbance (0-1200Hz); (5) Realize the stress and vibration test of the rotating parts (bearings, axles, wheelsets, etc.) of high-speed trains under high speed (0-500km / h) and high frequency (0-1200Hz) conditions.

[0046] In the embodiments of this application, such as Figure 1 As shown, any set of test mechanisms also includes a first coupling 4, a second coupling 6, a third coupling 8, a fourth coupling 11, and a fifth coupling. The motor 3 of any set is connected to the first end of the synchronous gearbox 5 through the first coupling 4. The second end of the synchronous gearbox 5 is connected to the first end of the variable speed gearbox 7 through the second coupling 6. The second end of the variable speed gearbox 7 is connected to one of the track wheels 103 through the third coupling 8. One of the track wheels 103 is connected to the other track wheel 103 through the fourth coupling 11. The third end of the synchronous gearbox 5 is connected to the third end of the synchronous gearbox 5 of another set through the second coupling 6. The axial directions of the second coupling 6, the third coupling 8, and the fourth coupling 11 all extend along a first direction, and the axial directions of the first coupling 4 and the fifth coupling all extend along a second direction. The first direction is perpendicular to the second direction.

[0047] Furthermore, the vibration test bench also includes two sets of tracks 1 (any set of tracks 1 can be two tracks 1), and any set of test mechanisms also includes a transmission platform 2 and a first platform 12. The motor 3, synchronous gearbox 5 and speed change gearbox 7 of any set of test mechanisms are all set on the transmission platform 2. The transmission platform 2 is slidably connected to one set of tracks 1 and can slide along the second direction on the current track 1. The two track wheels 103 of any set of test mechanisms are all set on the first platform 12. The first platform 12 is slidably connected to the other set of tracks 1 and can slide along the second direction on the current track 1.

[0048] Here, as Figure 1 As shown, by extending or retracting the fifth coupling or replacing the intermediate section, the wheelbase of the test bench can be adjusted to match the wheelbase L1 of the vehicle under test 17 or the bogie under test 22 (while simultaneously sliding the transmission platform 2 or the first platform 12).

[0049] In addition, such as Figure 6 As shown, the position between the two track wheels 103 in the track wheel device 10 can also be adjusted along the length direction of the first platform 12, that is, by changing the length or intermediate section of the fourth coupling 11 to adapt to the track gauge L2 of the test vehicle 17 or the test bogie 22.

[0050] In the embodiments of this application, when the test specimen (test vehicle 17 or test bogie 22) is tested, the track wheel 103 contacts the test wheel. The track wheel 103 is driven to rotate via the motor 3, coupling, synchronous gearbox 5, and transmission gearbox 7, thereby exciting the test specimen. Depending on the test requirements, the motor 3 can be used as a load, and the motor 3 on the test specimen can be used as a drive, enabling high-frequency excitation of the test specimen under load conditions. The specific test process is as follows:

[0051] According to a second aspect of this application, a vibration testing apparatus is provided, including the vibration testing bench as described above.

[0052] The vibration test device includes a base with a groove, and the vibration test bench is disposed in the groove. The vibration test device also includes a traction device 15, which is disposed on the base (outside the groove of the base). The traction device 15 is used to connect the bogie under test 22 so that the bogie under test 22 can move in the second direction.

[0053] The testing process for the bogies will be described in detail below:

[0054] In the embodiments of this application, such as Figure 3 and Figure 5As shown, the traction device 15 may include a mounting base 151, a traction base 152, a traction cylinder 153, and a hydraulic station 154. The hydraulic station 154 controls the extension and retraction of the traction cylinder 153, which drives the extension and retraction of the tie rod 16. This enables the longitudinal movement adjustment and traction positioning (i.e., the second direction) of the test object (the test vehicle 17 or the test bogie 22) so that the four wheels of the test bogie 22 contact the four track wheels 103.

[0055] like Figure 5 As shown, the gantry 25 includes a mounting base 251, a column 252, a connecting beam 253, and a crossbeam 254. The column 252 of the gantry 25 is mounted on the track via the mounting base 251, and the crossbeam 254 connects to the column 252.

[0056] The dummy car body 23 includes a dummy car body frame 231, vertical beams 232, connecting rods 233, and mounting brackets 234. The dummy car body 23 mainly simulates the car body of the bogie 22 under test, and is used to apply longitudinal constraints and vertical loads to the bogie under test.

[0057] Specifically, the ball joints at both ends of the compression cylinder 24 are connected to the crossbeam 254 of the gantry 25 and the top of the dummy car frame 231 of the dummy car body 23, respectively. The bottom of the dummy car frame 231 is connected to the bogie, and the tie rod 16 is connected to the end of the dummy car frame 231. The extension and retraction of the traction cylinder 153 is controlled by the hydraulic station 154, which drives the extension and retraction of the tie rod 16. This enables the longitudinal movement adjustment and traction positioning (i.e., the second direction) of the bogie under test 22. At the same time, the compression cylinder 24 simulates axle load on the bogie under test 22. After positioning is completed, the mounting brackets 234 at both ends are locked.

[0058] The testing process for the vehicle will be described in detail below:

[0059] like Figure 2 and Figure 4 As shown, the rail 19 is pre-embedded in the foundation (base) with the T-slot plate 20. The rail 19 is installed on the T-slot plate 20 via the clamping iron 21. The rail 19 can be moved along the T-slot direction of the T-slot plate 20 to adjust the track gauge. When the test object is the test vehicle 17, the position of the left traction device 15 is adjusted, and the non-test bogie of the test vehicle is simultaneously lowered onto the rail 19. The T-slot guide rail 18 is pre-embedded in the foundation, and the traction device 15 is installed on the T-slot guide rail 18. The traction device 15 can be moved along the T-slot direction of the T-slot guide rail 18 to adapt to different test object lengths. The traction cylinder 153 of the traction device 15 is connected to the end of the test vehicle 17 via the pull rod 16.

[0060] Preferably, a traction device 15 with the same structure can also be provided at the other end of the vehicle or the other end of the dummy vehicle body 23.

[0061] In the embodiments of this application, such as Figure 7 As shown, the two ends of the shaft of any one of the track wheels 103 of the track wheel device 10 can be limited by two bearing seats 102. The bottom of the two bearing seats 102 is equipped with a mounting base 101, and the top of the two bearing seats 102 is equipped with a sensor 104.

[0062] In addition, such as Figure 6 As shown, the vibration test device can also be equipped with an angle of attack adjustment mechanism 14. By adjusting the angle of attack adjustment mechanism 14, the rotation of the track wheel device 10 can be achieved, thereby completing the angle of attack adjustment.

[0063] Specifically, each test mechanism also includes a second platform 13 and a center pin 29. The second platform 13 is connected to the first platform 12. Both track wheels 103 of each test mechanism are located on the second platform 13, that is, the two mounting seats 101 at the bottom of the two track wheels 103 are located on the second platform 13. The center pin 29 passes through the first platform 12 and connects to the second platform 13. The second platform 13 can rotate relative to the first platform 12 around the center pin 29. On-site personnel can adjust the angle of attack as needed to allow the vehicle under test to pass through the four track wheels 103 more smoothly, preventing jamming due to a fixed angle of attack.

[0064] Furthermore, in the embodiments of this application, such as Figure 6 As shown, a speed sensor bracket 26 is installed on one side of the second platform 13, and a speed sensor 27 is mounted on the speed sensor bracket 26. The speed of the track wheel 103 is measured through the speed measuring gear flange 28 at the shaft end of the bearing housing 102 and the speed sensor 27. The speed sensor 27 can more accurately measure the speed of the track wheel 103.

[0065] Furthermore, in the embodiments of this application, such as Figure 1 and Figure 3 As shown, the lubrication mechanism 9 is used for the lubrication and cooling of the track wheel assembly 10, the synchronous gearbox 5, and the variable speed gearbox 7, that is, to deliver lubricating oil to the track wheel assembly 10, the synchronous gearbox 5, and the variable speed gearbox 7.

[0066] According to the vibration test bench and vibration test device of this application, the vibration test bench includes two sets of test mechanisms. Each set of test mechanisms includes a motor, a synchronous gearbox, a variable speed gearbox, and a track wheel device. The track wheel device includes two track wheels. The motor of any set is connected to the first end of the synchronous gearbox, the second end of the synchronous gearbox is connected to the first end of the variable speed gearbox, and the second end of the variable speed gearbox is connected to the two track wheels to drive the two track wheels to rotate. The third end of the synchronous gearbox is connected to the third end of the synchronous gearbox of the other set. The outer edge of the track wheel is polygonal, and the polygon is distributed with sine waves.

[0067] The test bench of this application uses a structure of motor + synchronous gearbox + speed change gearbox + track wheel device to achieve mechanical synchronization of the front and rear axles of the bogie. It has high synchronization accuracy and high reliability. Moreover, the track wheel is processed into a polygonal shape, which can simulate high-frequency excitation under load test, making the test closer to the actual situation.

[0068] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The scope of protection of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A vibration test bench, characterized in that, The vibration test bench includes two sets of test mechanisms. Each set of test mechanisms includes a motor, a synchronous gearbox, a variable speed gearbox, and a track wheel assembly. The track wheel assembly includes two track wheels. In any set of the test mechanisms, the motor is connected to the first end of the synchronous gearbox, the second end of the synchronous gearbox is connected to the first end of the variable speed gearbox, and the second end of the variable speed gearbox is connected to two track wheels to drive the two track wheels to rotate. The third end of the synchronous gearbox included in one of the two sets of test mechanisms is connected to the third end of the synchronous gearbox included in the other set of test mechanisms. The outer edge of the track wheel is polygonal, and the polygonal distribution is a sine wave. Excitation frequency: f=nN / 60i, where n is the rotational speed of the motor, N is the number of polygons of the track wheel, and i is the total transmission ratio of the synchronous gearbox and the variable speed gearbox; Any of the aforementioned test mechanisms further includes a first coupling, a second coupling, a third coupling, a fourth coupling, and a fifth coupling. The motor of any one of the test mechanisms is connected to the first end of the synchronous gearbox via the first coupling. The second end of the synchronous gearbox is connected to the first end of the variable speed gearbox via the second coupling. The second end of the variable speed gearbox is connected to one of the track wheels via the third coupling. One of the track wheels is connected to the other track wheel via the fourth coupling. The third end of the synchronous gearbox is connected to the third end of another set of synchronous gearboxes via the second coupling. The axial directions of the second coupling, the third coupling, and the fourth coupling all extend along a first direction, while the axial directions of the first coupling and the fifth coupling all extend along a second direction, and the first direction is perpendicular to the second direction. The vibration test bench also includes two sets of tracks, and each set of the test mechanism further includes a transmission platform and a first platform. The motor, the synchronous gearbox, and the variable speed gearbox of any one of the test mechanisms are all mounted on the transmission platform. The transmission platform is slidably connected to one of the sets of tracks and is capable of sliding along the second direction on the current track. Both track wheels of any one of the test mechanisms are mounted on the first platform. The first platform is slidably connected to another set of tracks and is capable of sliding along a second direction on the current track.

2. The vibration test bench according to claim 1, characterized in that, The track wheel assembly also includes a speed sensor for detecting the rotational speed of the track wheel.

3. The vibration test bench according to claim 1, characterized in that, Any of the test mechanisms further includes a second platform and a central pin, the second platform being connected to the first platform. Both track wheels of any one of the test mechanisms are mounted on the second platform. The central pin passes through the first platform and connects to the second platform, which is capable of rotating about the central pin relative to the first platform.

4. A vibration testing device, characterized in that, The vibration testing apparatus includes a vibration testing bench as described in any one of claims 1-3.

5. The vibration testing apparatus according to claim 4, characterized in that, The vibration testing device includes a base with a groove, and the vibration testing platform is disposed within the groove. The vibration test apparatus also includes a traction device, which is disposed on the base and is used to connect the bogie under test so that the bogie under test can move in the second direction.

6. The vibration testing apparatus according to claim 5, characterized in that, The traction device includes a traction cylinder and a tie rod, and the vibration testing device also includes a crossbeam, a column, a compression cylinder, and a dummy vehicle body. The bottom of the dummy car body is used to connect the bogie under test, and the four wheels of the bogie under test are in contact with the four track wheels. The upright is connected to the track, and the crossbeam is connected to the upright. The two ends of the compression cylinder are respectively connected to the crossbeam and the top of the dummy vehicle body. The traction cylinder is connected to the end of the dummy vehicle body via the tie rod.

7. The vibration testing apparatus according to claim 5, characterized in that, The traction device includes a traction cylinder and a tie rod, and the vibration testing device also includes a steel rail. The rails are set on the base, and the non-tested bogie of the vehicle under test is positioned on the rails, with the four wheels of the tested bogie in contact with the four rail wheels. The traction cylinder is connected to the end of the vehicle under test via the tie rod.

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