Brake regulator cycle test mechanism and test method for railway vehicle

Abstract

The application provides a brake regulator cycle test mechanism and test method of a railway vehicle, and belongs to the technical field of railway vehicle braking. The test mechanism comprises a base, a brake cylinder, a brake lever, an end support, a brake regulator mounting and adjusting frame, a control lever support and a test piece brake regulator which are mounted on the mounting surface of the base. The brake regulator mounting and adjusting frame and the control lever support are arranged at intervals, the control lever support is provided with a stroke control lever, and the stroke control lever is provided with a connecting plate. The screw rod of the test piece brake regulator is connected with the brake regulator mounting and adjusting frame, the pull rod of the test piece brake regulator is slidably arranged in the connecting plate and connected with the middle part of the brake lever, the adjusting pad plate is mounted on the pull rod, the two ends of the brake lever are located at the two ends of the stroke control lever in the extending direction, one end of the brake lever is hinged with the piston rod of the brake cylinder, and the other end of the brake lever is hinged with the end support. The test mechanism has simple structure, convenient operation and can greatly reduce the test time.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of railway vehicle braking technology, in particular to a brake regulator cycle test mechanism and test method of a railway vehicle. BACKGROUND

[0002] The railway freight cars designed and developed by the leading design units of China railway freight cars involve TB, AAR, UIC, ROA and other standard systems. The performance parameters, fatigue stability and operation reliability of new brake components and brake units need to be verified by relevant preliminary cycle tests during research and development.

[0003] In the product research and development process of the prior art, due to the changes of standard system, vehicle limit, and vehicle operation region, the operation parameters of the brake device of the railway vehicle need to be designed and calculated. The brake shoe gap automatic adjuster, that is, the brake regulator, can automatically adjust the gap between the wheel and the brake shoe. It can automatically keep the brake cylinder piston stroke within the specified range according to the change of the brake shoe gap, keep the gap between the brake shoe and the wheel normal, ensure that the vehicle braking force does not attenuate, and effectively ensure the driving safety. At present, the common practice of each railway freight car design unit is to install the brake regulator on the trial vehicle to carry out real vehicle test.

[0004] When the brake regulator works, the screw rod will be elongated under the load of the brake lever. Under different working conditions, the screw rod of the brake regulator also has different extension lengths. In order to meet the test requirements of the brake regulator under various conditions, the existing test method often needs to find a matching test vehicle for real vehicle test. Because the installation and testing steps of the brake regulator and the real vehicle are relatively complicated, it is also necessary to wait for the test vehicle to be completed before matching for test, which leads to harsh test conditions and operation requirements, and long test cycle. SUMMARY

[0005] The embodiment of the present application provides a brake regulator cycle test mechanism of a railway vehicle, which is simple in structure, convenient to operate and can greatly reduce the test time. The technical scheme is as follows:

[0006] In the first aspect, the embodiment of the present application provides a brake regulator cycle test mechanism of a railway vehicle, which comprises a base, a brake cylinder, a brake lever, an end support, a brake regulator installation and adjustment frame, a control lever support and a test piece brake regulator.

[0007] The base has a mounting surface, the brake cylinder, the end support, the brake adjuster mounting bracket and the control lever support are mounted on the mounting surface, the brake adjuster mounting bracket and the control lever support are arranged in intervals, the control lever support is provided with a stroke control lever protruding towards the brake adjuster mounting bracket, the stroke control lever is provided with a connecting plate at the bottom of one end close to the brake adjuster mounting bracket, a screw rod at one end of the test brake adjuster is connected with the brake adjuster mounting bracket, a pull rod at the other end of the test brake adjuster is slidably arranged in the connecting plate and connected with the middle part of the brake lever, an adjusting pad is mounted on the pull rod between the cylinder of the test brake adjuster and the connecting plate, the adjusting pad is arranged along the radial direction of the pull rod, the two ends of the brake lever are respectively located at the two ends of the stroke control lever in the extending direction, one end of the brake lever is hinged with the piston rod of the brake cylinder, the piston rod is parallel to the test brake adjuster, and the other end of the brake lever is hinged with the end support.

[0008] Optionally, the adjusting pad is detachably connected with the pull rod.

[0009] Optionally, the bottom end surface of the connecting plate is provided with a U-shaped groove matched with the pull rod.

[0010] Optionally, the stroke control lever comprises a first lever body and a second lever body, the connecting plate is located at one end of the first lever body, the other end of the first lever body is hinged with one end of the second lever body, the hinged axis of the first lever body and the second lever body is parallel to the mounting surface, the other end of the second lever body is connected with the control lever support, and the hinged position of the pull rod and the brake lever is below the first lever body.

[0011] Optionally, the brake adjuster cycle test mechanism of the railway vehicle further comprises a gap adjusting assembly, the gap adjusting assembly comprises a spring box, a connecting rod, a spring and a box cover, the spring box is fixedly connected with the brake adjuster mounting bracket, the spring box is cylindrical and coaxially arranged with the test brake adjuster, one end of the spring box away from the control lever support is provided with an opening, the connecting rod is arranged in the middle part of the spring box, one end of the connecting rod is connected with one end of the screw rod, the other end of the connecting rod is provided with a limiting protrusion, the box cover is coaxially sleeved on the connecting rod and located between the spring box and the limiting protrusion, the spring is sleeved on the connecting rod and located in the spring box, one end of the spring is connected with one end of the spring box close to the control lever support, the other end of the spring is connected with the box cover, and the length of the spring is greater than the depth of the spring box.

[0012] Optionally, a plurality of the limiting protrusions are provided, and the plurality of limiting protrusions are detachably mounted on the connecting rod and arranged in a stacking manner along the length direction of the connecting rod.

[0013] Optionally, one end of the connecting rod is hinged to one end of the screw rod.

[0014] In a second aspect, the embodiment of the present application provides a test method, which is realized based on the brake regulator circulation test mechanism of the railway vehicle of the first aspect.

[0015] The test piece brake regulator is mounted between the brake regulator mounting adjusting frame and the control lever support, the screw rod is connected to the brake regulator mounting adjusting frame, the pull rod is arranged in the connecting plate and connected to the middle part of the brake lever;

[0016] A pressure sensor is arranged at the connection between the pull rod and the brake lever;

[0017] The piston rod of the brake cylinder is controlled to extend and retract, so as to apply a pulling force to the test piece brake regulator by the brake lever, until the adjusting pad plate on the pull rod abuts against the connecting plate, and the test load at the connection between the pull rod and the brake lever is obtained by the pressure sensor.

[0018] The technical scheme provided by the embodiment of the present application has at least the following beneficial effects:

[0019] The brake regulator circulation test device of the railway vehicle provided by the embodiment of the present application can be used to connect and assemble the test piece brake regulator by the brake regulator mounting adjusting frame and the control lever support on the base in the test room. During the test, the brake cylinder provides driving load for the test piece brake regulator through the brake lever, and the initial extension length of the screw rod is controlled by the adjusting pad plate on the pull rod and the connecting plate on the control lever support, so that the test piece brake regulator can perform brake release simulation test under the specified parameters. The structure is simple, the installation operation is convenient, and the test can be performed after the completion without the cooperation of a special test vehicle, so that the test time can be greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiment of the present application, the drawings needed in the embodiment description will be briefly introduced. 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.

[0021] Figure 1 is a perspective structural schematic view of the brake regulator circulation test mechanism of the railway vehicle provided by the embodiment of the present application;

[0022] Figure 2 is a partial structure schematic diagram of the brake regulator circulating test mechanism of the railway vehicle provided by the embodiment of the present application;

[0023] Figure 3 is an assembly structure schematic diagram of the end support and brake lever provided by the embodiment of the present application;

[0024] Figure 4 is a structure schematic diagram of the control lever support provided by the embodiment of the present application;

[0025] Figure 5 is a structure schematic diagram of the brake regulator installation adjusting frame and gap adjusting assembly provided by the embodiment of the present application;

[0026] Figure 6 is a three-dimensional structure schematic diagram of the gap adjusting assembly provided by the embodiment of the present application;

[0027] Figure 7 is a flow chart of the test method provided by the embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0029] In the product development process of the prior art, due to the changes of the standard system, the vehicle gauge, and the vehicle operation region, the operation parameters of the brake device of the railway vehicle need to be designed and calculated. The brake shoe gap automatic adjuster, that is, the brake regulator, can automatically adjust the gap between the wheel and the brake shoe. It can automatically keep the brake cylinder piston stroke within the specified range according to the change of the brake shoe gap, keep the gap between the brake shoe and the wheel normal, ensure that the vehicle braking force does not attenuate, and effectively ensure the driving safety. At present, the common practice of each railway freight car design unit is to install the brake regulator on the test vehicle matched with the test vehicle to perform real vehicle test.

[0030] When the brake regulator works, the screw rod thereof will be elongated under the load of the brake lever. The screw rod extension length of the brake regulator is not the same under different working conditions. In order to meet the test requirements of the brake regulator under various conditions, the test vehicle matched with the brake regulator is often needed to perform real vehicle test. Since the installation and test steps of the brake regulator and the real vehicle are relatively complicated, the test vehicle needs to be matched after the test vehicle is completed, which leads to harsh test conditions and operation requirements, and long test period.

[0031] Figure 1 is a three-dimensional structure schematic diagram of the brake regulator circulating test mechanism of the railway vehicle provided by the embodiment of the present application. Figure 2 is a partial structure schematic diagram of the brake regulator circulating test mechanism of the railway vehicle provided by the embodiment of the present application. Figure 3is an assembly structure schematic view of an end support and a brake lever provided by the embodiment of the present application.

[0032] Figure 4 is a structure schematic view of a control lever support provided by the embodiment of the present application. Figure 5 is a structure schematic view of a brake regulator mounting adjusting frame and a gap adjusting assembly provided by the embodiment of the present application. Figure 6 is a three-dimensional structure schematic view of the gap adjusting assembly provided by the embodiment of the present application. Figures 1 to 6 As shown in the figure, through practice, the embodiment of the present application provides a brake regulator cycle test mechanism of a railway vehicle, which comprises a base 1, a brake cylinder 2, a brake lever 3, an end support 4, a brake regulator mounting adjusting frame 5, a control lever support 6 and a test piece brake regulator 7,

[0033] The base 1 is provided with a mounting surface 1a, the brake cylinder 2, the end support 4, the brake regulator mounting adjusting frame 5 and the control lever support 6 are all mounted on the mounting surface 1a, the brake regulator mounting adjusting frame 5 and the control lever support 6 are arranged at intervals, the control lever support 6 is provided with a stroke control lever 61 which protrudes towards the brake regulator mounting adjusting frame 5, the stroke control lever 61 is provided with a connecting plate 62 at the bottom of one end close to the brake regulator mounting adjusting frame 5, a screw rod 71 located at one end of the test piece brake regulator 7 is connected with the brake regulator mounting adjusting frame 5, a pull rod 72 located at the other end of the test piece brake regulator 7 is slidably arranged in the connecting plate 62 and connected with the middle part of the brake lever 3, an adjusting pad 74 is mounted on the pull rod 72 between the cylinder body 73 of the test piece brake regulator 7 and the connecting plate 62, the adjusting pad 74 is arranged along the radial direction of the pull rod 72, the two ends of the brake lever 3 are located at the two ends of the stroke control lever 61 in the extending direction, one end of the brake lever 3 is hinged with a piston rod 21 of the brake cylinder 2, the piston rod 21 is parallel to the test piece brake regulator 7, the other end of the brake lever 3 is hinged with the end support 4.

[0034] In the embodiment of the present application, the brake regulator cycle test device of the railway vehicle can be arranged in the test room through the base 1. When the cycle test of the brake regulator is needed to obtain the test parameters thereof, the brake regulator of the corresponding specification test piece 7 can be installed between the brake regulator installation adjusting frame and the control lever support 6, the screw rod 71 is connected with the brake regulator installation adjusting frame 5, the pull rod 72 is arranged in the connecting plate 62 and connected with the middle part of the brake lever 3, so as to simulate the connection and assembly form of the brake regulator on the vehicle body. After the assembly is completed, the adjusting pad plate 74 is assembled on the segment of the pull rod 72 which extends out of the test piece brake regulator 7 between the cylinder 73 and the connecting plate 62, and the axial distance A between the adjusting pad plate 74 and the end of the cylinder 73 when the screw rod 71 at one end of the test piece brake regulator 7 is not elongated is the control distance of the test piece brake regulator 7. The test piece brake regulator 7 with different test distances can be selected according to the test requirements, so that the brake regulator cycle test is operated under the specified parameter requirements. The connecting plate 62 on the control lever support 6 not only plays a role in positioning and supporting the pull rod 72, but also simulates the brake lever and the stop iron. The piston rod 21 of the control brake cylinder 2 is extended and retracted, drives the brake lever 3 to rotate around the hinge of the end support 4 to realize the horizontal displacement of the middle part, so as to apply the pulling force to the test piece brake regulator 7 by the brake lever 3, until the adjusting pad plate 74 on the pull rod 72 abuts against the connecting plate 62 to make the screw rod 71 of the test piece brake regulator 7 reach the initial elongation length. Then, the piston rod 21 of the brake cylinder 2 is continuously elongated to provide the pulling force for the test piece brake regulator 7 to elongate the screw rod 71, or is retracted to make the test piece brake regulator 7 contract, so as to simulate the “braking-relief” working condition of the brake regulator and realize the brake regulator cycle test.

[0035] The brake regulator cycle test device of the railway vehicle provided by the embodiment of the present application can be connected and assembled to the test piece brake regulator 7 in the test room by the brake regulator installation adjusting frame 5 and the control lever support 6 on the base 1. The brake cylinder 2 provides the driving load for the test piece brake regulator 7 through the brake lever 3 during the test, the initial elongation length of the screw rod 71 is controlled by the cooperation between the adjusting pad plate 74 on the pull rod 72 and the connecting plate 62 on the control lever support 6, so that the test piece brake regulator 7 can be tested under the specified parameters. The structure is simple, the installation and operation are convenient, the test does not need to be carried out after the special test vehicle is matched, and the test time can be greatly reduced.

[0036] Optionally, the adjusting pad plate 74 and the pull rod 72 are detachably connected. For example, in the embodiment of the present application, the adjusting pad plate 74 is provided with multiple sizes with different thicknesses corresponding to the brake regulator test of different specifications, so that the control distance A can be adjusted by replacing the pull rod 72, and the adaptability of the test device is improved.

[0037] Optionally, the bottom end surface of the connecting plate 62 is provided with a U-shaped groove 621 matched with the pull rod 72. Exemplarily, in the embodiment of the application, when assembling the test piece brake adjuster 7, the pull rod 72 segment penetrating into the connecting plate 62 can be directly inserted into the connecting plate 62 from the opening of the U-shaped groove 621, and after the assembly is completed, the groove wall of the U-shaped groove 621 can limit the expansion path of the pull rod 72, which is simple in structure and convenient to disassemble and assemble.

[0038] Optionally, the stroke control lever 61 comprises a first lever body 611 and a second lever body 612, the connecting plate 62 is located at one end of the first lever body 611, the other end of the first lever body 611 is hinged with one end of the second lever body 612, the hinged axis of the first lever body 611 and the second lever body 612 is parallel to the mounting surface 1a, the other end of the second lever body 612 is connected with the control lever support 6, and the hinged position of the pull rod 72 and the brake lever 3 is below the first lever body 611. Exemplarily, in the embodiment of the application, the stroke control lever 61 is composed of the first lever body 611 and the second lever body 612 hinged with each other, when assembling the test piece brake adjuster 7, the first lever body 611 can be first rotated upward by 90° to be lifted up, so as to facilitate the connection of the pull rod 72 and the brake lever 3 of the test piece brake adjuster 7. Then, the first lever body 611 is rotated downward by 90°, so that the U-shaped groove 621 on the connecting plate 62 is matched with the pull rod 72, and the assembly is completed, which further improves the assembly convenience.

[0039] Optionally, the brake rigging cycle test mechanism of the railway vehicle further comprises a gap adjustment assembly 8, the gap adjustment assembly 8 comprises a spring box 81, a connecting rod 82, a spring 83 and a box cover 84, the spring box 81 is fixedly connected to the brake rigging mounting adjusting frame 5, the spring box 81 is cylindrical and coaxially arranged with the test piece brake rigging 7, an opening is arranged at an end of the spring box 81 away from the control lever support 6, the connecting rod 82 is arranged in the middle of the spring box 81, one end of the connecting rod 82 is connected with one end of the screw rod 71, a limiting protrusion 821 is arranged at the other end of the connecting rod 82, the box cover 84 is coaxially sleeved on the connecting rod 82 and located between the spring box 81 and the limiting protrusion 821, the spring 83 is sleeved on the connecting rod 82 and located in the spring box 81, one end of the spring 83 is connected with the end of the spring box 81 close to the control lever support 6, the other end of the spring 83 is connected with the box cover 84, and the length of the spring 83 is greater than the depth of the spring box 81. Illustratively, in the embodiment of the present application, since the length of the spring 83 is greater than the depth of the spring box 81, when the box cover 84 is in a free state, it has a certain gap B with the opening end of the spring box 81, the gap B corresponds to the spring deformation amount limiting stroke in the actual brake rigging, and the function is to simulate the gap between the brake shoe and the wheel in the vehicle operation, the spring box spring pressure value B and the range of the value B should meet the requirements of relevant technical documents such as TB / T2916-2017 “Two-way brake shoe gap adjuster for railway vehicles” or brake rigging cycle test specification. During the test, under the action of the test load, the connecting rod 82 of the spring box 81 carries the limiting protrusion 821 installed thereon and moves axially with the “braking-easing” of the test brake rigging, when the spring box 81 is compressed and the B value gradually decreases to 0, it is simulated as the vehicle braking condition, and vice versa as the vehicle easing condition, forming a cycle test period. It can further simulate the real vehicle cycle of the brake rigging, and improve the test accuracy.

[0040] Optionally, the limiting protrusion 821 is provided in plurality, the plurality of limiting protrusions 821 are detachably installed on the connecting rod 82 and stacked along the length direction of the connecting rod 82. Illustratively, in the embodiment of the present application, the axial gap C between the one closest to the box cover 84 in the stacked plurality of limiting protrusions 821 and the box cover 84 corresponds to the brake rigging screw rod extension length and the wheel shoe wear state, by installing different number of limiting protrusions 821 to adjust the length of the axial gap C, different wheel shoe wear conditions in the real vehicle operation can be simulated, so as to simulate the braking and easing test of the test piece brake rigging 7 for different wheel shoe wear conditions in the vehicle operation process, and further improve the test accuracy.

[0041] Optionally, one end of the connecting rod 82 is hinged with one end of the screw rod 71. Exemplarily, in the embodiment of the application, the connecting rod 82 is hinged with the screw rod 71 in the same pivot hinge form as the pull rod 72 and the brake lever 3. In the process of stretching and retracting, the connecting part between the two can adaptively rotate when relative vibration is generated in the stretching and retracting, so as to avoid excessive stress of the fixed connecting part and breakage, and improve the overall service life of the test device.

[0042] Figure 7 is a flow chart of a test method provided by the embodiment of the application. The embodiment of the application also provides a test method, which is implemented based on the brake rigging cycle test mechanism of the railway vehicle as shown in Figures 1 to 6 The test method comprises the following steps.

[0043] S1, the test piece brake rigging 7 is installed between the brake rigging installation adjusting frame 5 and the control lever support 6, the screw rod 71 is connected with the brake rigging installation adjusting frame 5, and the pull rod 72 is arranged in the connecting plate 62 and connected with the middle part of the brake lever 3.

[0044] S2, a pressure sensor is arranged at the connecting part of the pull rod 72 and the brake lever 3.

[0045] S3, the piston rod 21 of the brake cylinder 2 is controlled to stretch and retract, so as to apply a pulling force to the test piece brake rigging 7 by the brake lever 3, until the adjusting pad plate 74 on the pull rod 72 abuts against the connecting plate 62, and the test load at the connecting part of the pull rod 72 and the brake lever 3 is obtained by the pressure sensor.

[0046] Specifically, in the embodiment of the application, in addition to being capable of performing the “braking-release” cycle test of the brake rigging of the railway vehicle by using the test device, when the adjusting pad plate 74 on the pull rod 72 abuts against the connecting plate 62, the test load borne by the screw rod 71 of the test piece brake rigging 7 when the screw rod 71 is stretched out to the initial length critical point is obtained by using the pipeline connection and the software measurement and control system, that is, the minimum starting force of the brake rigging. The minimum starting force of the brake rigging of different specifications can be detected at the same time by using the test device.

[0047] The brake regulator cycle test device and the test method can be used to connect and assemble the test piece brake regulator 7 by the brake regulator installation adjusting frame 5 and the control lever support 6 on the base 1 in the laboratory. The brake cylinder 2 provides driving load for the test piece brake regulator 7 through the brake lever 3 during the test, and the initial extension length of the screw rod 71 is controlled by the adjusting pad plate 74 on the pull rod 72 and the connecting plate 62 on the control lever support 6, so that the test piece brake regulator 7 can be tested under the specified parameters. The structure is simple, the installation operation is convenient, and the test time can be greatly reduced without the cooperation of a special test vehicle.

[0048] Unless otherwise defined, technical terms or scientific terms used herein shall have the ordinary meanings as understood by one of ordinary skill in the art to which this application pertains. The terms "first", "second", and similar terms as used in the specification and claims of this application do not necessarily have an ordinal, chronological, or sequential significance. Rather, such terms are used merely to distinguish different components or steps in the present application. Similarly, the terms "a" or "an", as used herein, do not denote a limitation of quantity but rather denote the presence of at least one of the referenced items. The terms "including", "comprising", and similar terms as used herein are intended to be open-ended and to mean that other components or items not specifically named are optionally present. The terms "connected" or "coupled" as used herein are not limited to direct connections or couplings, but rather include indirect connections or couplings, and are intended to encompass a wide variety of connections or couplings, such as electrical connections or couplings, whether direct or indirect. The terms "upper", "lower", "left", "right", and the like as used herein are intended to be relative terms that indicate relative positions or directions, and can change when the absolute positions of the described objects change.

[0049] The above description is merely optional embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A brake rigging cycle test mechanism for a railway vehicle, characterized by, The utility model relates to a brake test bench, including: Base (1), brake cylinder (2), brake lever (3), end support (4), brake adjuster mounting adjusting frame (5), control rod support (6) and test piece brake adjuster (7), The base (1) has a mounting surface (1a) on it, the brake cylinder (2), the end support (4), the brake adjuster mounting adjusting frame (5) and the control rod support (6) are all mounted on the mounting surface (1a), and the brake adjuster mounting adjusting frame (5) and the control rod support (6) are arranged at intervals, The control rod support (6) is provided with a stroke control lever (61) protruding towards the brake adjuster mounting adjusting frame (5), the bottom of one end of the stroke control lever (61) is provided with a connecting plate (62), the bottom end face of the connecting plate (62) is provided with a U-shaped groove (621) matched with a pull rod (72), the pull rod (72) can be directly embedded into the connecting plate (62) from the opening of the U-shaped groove (621), and the groove wall of the U-shaped groove (621) limits the extension and retraction path of the pull rod (72), The stroke control lever (61) comprises a first lever body (611) and a second lever body (612), the connecting plate (62) is located at one end of the first lever body (611), the other end of the first lever body (611) is hinged to one end of the second lever body (612), the hinge axis of the first lever body (611) and the second lever body (612) is parallel to the mounting surface (1a), the other end of the second lever body (612) is connected to the control rod support (6), when assembling the test piece brake adjuster (7), the first lever body (611) can be rotated upward by 90 degrees to facilitate the connection of the pull rod (72) and the brake lever (3), and then the first lever body (611) is rotated downward by 90 degrees, so that the U-shaped groove (621) on the connecting plate (62) is matched with the pull rod (72) to complete the assembly, The screw rod (71) at one end of the test piece brake adjuster (7) is connected to the brake adjuster mounting adjusting frame (5), the pull rod (72) at the other end of the test piece brake adjuster (7) is slidably arranged in the connecting plate (62) and connected to the middle part of the brake lever (3), and the hinge position of the pull rod (72) and the brake lever (3) is below the first lever body (611). An adjusting pad (74) is arranged on the pull rod (72) between the barrel (73) of the test brake adjuster (7) and the connecting plate (62), the adjusting pad (74) is arranged along the radial direction of the pull rod (72), the adjusting pad (74) is detachably connected with the pull rod (72), the adjusting pad (74) is provided with multiple sizes with different thicknesses, the control distance is adjusted by replacing the pull rod (72), the two ends of the brake lever (3) are respectively located at the two ends of the stroke control rod (61) in the extending direction, one end of the brake lever (3) is hinged with the piston rod (21) of the brake cylinder (2), the piston rod (21) is parallel to the test brake adjuster (7), and the other end of the brake lever (3) is hinged with the end support (4).

2. The brake rigging cycle test mechanism for a railway vehicle of claim 1, wherein, The brake adjuster circulating test mechanism of the railway vehicle further comprises a gap adjusting assembly (8), the gap adjusting assembly (8) comprises a spring box (81), a connecting rod (82), a spring (83) and a box cover (84), the spring box (81) is fixedly connected to the brake adjuster mounting adjusting frame (5), the spring box (81) is cylindrical and coaxially arranged with the test brake adjuster (7), an opening is arranged at one end of the spring box (81) away from the control rod support (6), the connecting rod (82) is arranged in the middle of the spring box (81), one end of the connecting rod (82) is connected with one end of the screw rod (71), the other end of the connecting rod (82) is provided with a limiting lug (821), the box cover (84) is coaxially sleeved on the connecting rod (82) and located between the spring box (81) and the limiting lug (821), the spring (83) is sleeved on the connecting rod (82) and located in the spring box (81), one end of the spring (83) is connected with one end of the spring box (81) close to the control rod support (6), the other end of the spring (83) is connected with the box cover (84), and the length of the spring (83) is greater than the depth of the spring box (81).

3. The brake rigging cycle test mechanism for a railway vehicle of claim 2, wherein, The limiting lug (821) is provided with multiple limiting lugs (821) which are detachably mounted on the connecting rod (82) and stacked along the length direction of the connecting rod (82).

4. The brake rigging cycle test mechanism for a railway vehicle of claim 2, wherein, One end of the connecting rod (82) is hinged with one end of the screw rod (71). 5.A test method based on the brake adjuster circulating test mechanism of the railway vehicle according to any one of claims 1 to 4, characterized in that: The test brake adjuster (7) is mounted between the brake adjuster mounting adjusting frame (5) and the control rod support (6), the screw rod (71) is connected with the brake adjuster mounting adjusting frame (5), the pull rod (72) is arranged in the connecting plate (62) and connected with the middle part of the brake lever (3); A pressure sensor is arranged at the connection between the pull rod (72) and the brake lever (3). The piston rod (21) of the brake cylinder (2) is controlled to stretch and contract, so that the brake lever (3) applies pulling force to the test brake adjuster (7), until the adjusting pad plate (74) on the pull rod (72) abuts against the connecting plate (62), and the test load at the joint of the pull rod (72) and the brake lever (3) is obtained by the pressure sensor.

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