A modular detection device for railway freight car brake parts

Abstract

The present invention complies with the technical field of railway freight car brake systems, and mainly mentions a modular detection device for railway freight car brake accessories. It includes a workbench, the workbench is fixedly connected with a control panel, an air pump, a first tank body and a support unit, the first tank body is provided with a pressure sensor and an exhaust pipe with an electromagnetic valve installed, the workbench is slidingly provided with a support frame, a first spring is installed between the support frame and the workbench, the air outlet end of the air pump is connected to a first air guide through a hose, the first tank body is connected to a second air guide, and the first air guide and the second air guide are both used to connect with the corresponding pipes on the brake accessory module; a vibration unit is fixed to the support frame through a fixed frame. The present invention creates a vibration environment for the brake accessory module by the relative sliding arrangement of the workbench and the support frame, and cooperates with the work of the vibration unit to ensure the comprehensiveness and accuracy of the test results.

Description

Technical Field

[0001] The present invention relates to the technical field of railway freight car brake systems, and in particular to a modular detection device for railway freight car brake accessories. Background Art

[0002] The railway freight car braking system is an important guarantee for the safe operation of trains, and its reliability is of vital importance. The system includes key components such as control valves, auxiliary air cylinders, and double-chamber air cylinders. In order to ensure the safety and reliability of the railway freight car braking system, it is necessary to conduct multi-faceted inspections on it. In the current process of testing the sealing of the braking system, the air tightness test is often performed on the sealing system after loading. After the problem is detected, the specified parts need to be disassembled, which increases the steps of repeated assembly and disassembly, making this air tightness testing method time-consuming and labor-intensive. At the same time, during the testing process, the existing technology often tests the railway freight car when it is stationary. In fact, the braking system components need to withstand the influence of broadband random vibrations and extreme temperature changes. These factors will significantly change the deformation characteristics and structural stress distribution of the seals. The existing single testing process cannot accurately reflect the performance of the braking system when the railway freight car is in motion, resulting in inaccurate test results. Summary of the Invention

[0003] In order to overcome the problems raised in the above background technology, the present invention provides a modular detection device for railway freight car brake accessories.

[0004] The technical implementation scheme of the present invention is: a modular detection device for brake accessories of railway freight cars, comprising a workbench, the workbench is fixedly connected to a control panel, an air pump, a first tank body and a support unit, the first tank body is provided with a pressure sensor and an exhaust pipe installed with an electromagnetic valve, the workbench is slidingly provided with a support frame for fixing the brake accessory module, a first spring is installed between the support frame and the workbench, the air outlet end of the air pump is connected to a first air guide member through a hose, the first tank body is connected to a second air guide member, the first air guide member and the second air guide member are both used to connect with corresponding pipes on the brake accessory module; a vibration unit is fixed to the support frame through a fixing frame, the support unit is used to support the fixing frame, and the vibration unit is used to create a vibration state for the brake accessory module.

[0005] Preferably, a quick-connect unit is also included, which is arranged on the first air guide member and the second air guide member. The quick-connect unit includes two fixed plates, and the two fixed plates are respectively fixed to the first air guide member and the second air guide member. The first air guide member and the second air guide member are both slidably provided with a sliding frame, and a tension spring is fixed between the sliding frame and the adjacent fixed plate. The sliding frame is rotatably provided with two symmetrically distributed swinging members, and the end of the swinging member away from the adjacent sliding frame is hook-shaped, and the swinging member is used to limit the corresponding pipeline in the brake accessory module.

[0006] Preferably, the first air guide and the second air guide are both fixedly connected to a fixing ring, the fixing ring is in contact with a corresponding pipe in the brake accessory module, and a rubber convex ring is provided on the fixing ring.

[0007] Preferably, the first air guide and the second air guide are both fixed with elastic sleeves, and the elastic sleeves are in contact with inner walls of corresponding pipes in the brake accessory module.

[0008] Preferably, the elastic sleeve is provided with an annular inclined surface, and the annular inclined surface of the elastic sleeve is used to guide the gas.

[0009] Preferably, the fixing plate is fixedly connected to a limiting shell, and the limiting shell is used to limit the swinging of the adjacent swinging member.

[0010] Preferably, the connection points between the first air guide and the second air guide and the adjacent elastic sleeves are stepped surfaces.

[0011] Preferably, it also includes: a second tank body, fixedly connected to the workbench, the second tank body is provided with a pressure sensor and an exhaust pipe with an electromagnetic valve installed, and the second tank body is connected to the hose through a connecting pipe; a fixed sleeve, fixedly connected to the first air guide member, the fixed sleeve is provided with a plurality of circular holes, the fixed sleeve is slidably provided with a sliding shell, the sliding shell is provided with a plurality of circular holes, a second spring is fixed between the sliding shell and the first air guide member, and when the circular holes on the sliding shell are aligned with the circular holes on the fixed sleeve, the first air guide member is in a connected state.

[0012] Preferably, it also includes: a conduit, fixedly connected to and connected to the first air guide member; a sliding plug, slidably arranged on the conduit, a third spring fixedly connected between the sliding plug and the first air guide member, the sliding plug penetrates the first air guide member and slides sealed therewith, the sliding shell is provided with a step surface, and when the sliding plug contacts the step surface of the sliding shell, the sliding plug is used to limit the movement of the sliding shell.

[0013] Preferably, it further comprises: a connecting frame fixedly connected to the sliding shell, the connecting frame being provided with an annular inclined surface; an elastic ring fixedly connected to the elastic sleeve connected to the first air guide, the annular inclined surface of the connecting frame being used to squeeze the elastic ring.

[0014] The beneficial effects of the present invention are as follows: the present invention creates a vibration environment for the brake accessory module through the relative sliding setting of the workbench and the support frame, and cooperates with the operation of the vibration unit to ensure the comprehensiveness and accuracy of the test results; utilizes the clamping of the swinging part to simplify the connection operation of the first air guide part and the second air guide part with the corresponding pipes in the brake accessory module, shortens the assembly time, and thus improves the test efficiency; through the limiting of the limiting shell, ensures the stability of the clamping of the swinging part, that is, improves the firmness of the connection; improves the sealing of the connection part through the elastic sleeve; through the relative movement of the fixed sleeve and the sliding shell, and cooperates with the detection of the pressure sensor in the second tank body, eliminates the detection error caused by leakage of the detection device; through the movement of the connecting frame to extrude the elastic ring, the elastic ring squeezes the elastic sleeve to expand outward, thereby improving the sealing between the elastic sleeve and the corresponding pipe in the brake accessory module. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0016] Figure 2 Schematic diagram of the three-dimensional structure of the fixing frame and the vibration unit of the present invention;

[0017] Figure 3 Schematic diagram of the three-dimensional structure of the hose and the first air guide member of the present invention;

[0018] Figure 4 is a cross-sectional view of the first air guide and the limiting housing of the present invention;

[0019] Figure 5 is a cross-sectional view of the fixed sleeve and the sliding shell of the present invention;

[0020] Figure 6 It is a cross-sectional view of the elastic sleeve and the connecting frame of the present invention.

[0021] Marked in the figure: 1-workbench, 2-control panel, 3-support frame, 301-first spring, 4-air pump, 401-hose, 5-first air guide, 6-first tank body, 601-second air guide, 7-fixed frame, 8-vibration unit, 9-support unit, 10-fixed plate, 11-sliding frame, 111-tension spring, 12-swinging member, 13-fixed ring, 14-elastic sleeve, 15-limiting shell, 16-second tank body, 17-fixed sleeve, 18-sliding shell, 19-second spring, 20-conduit, 21-sliding plug, 22-third spring, 23-connecting frame, 24-elastic ring. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and examples.

[0023] Example 1: A modular detection device for railway freight car brake parts, such as Figure 1-Figure 3 As shown, the workbench 1 includes a control panel 2, an air pump 4, a first tank 6 and a support unit 9 fixedly connected to the workbench 1. The control panel 2 is used to control all electrical components. The first tank 6 is provided with a pressure sensor and an exhaust pipe for installing a solenoid valve. The support unit 9 is an electric telescopic bracket. The workbench 1 is slidingly provided with a support frame 3 for fixing the brake accessory module. The brake accessory module is composed of a control valve, a secondary air cylinder, a double-chamber air cylinder (or called a main air cylinder), pipes, joints and auxiliary devices. Four first springs 301 are installed between the support frame 3 and the workbench 1. The air outlet end of the air pump 4 is connected to the first air guide 5 through a hose 401. The first tank 6 is connected to the second air guide 601. The first The air guide 5 and the second air guide 601 are both used to connect with the corresponding pipes on the brake accessory module. The air pump 4 is used to inject gas into the brake accessory module, and at the same time cooperates with the pressure sensor in the first tank body 6 to detect the pressure to complete the air tightness detection of the brake accessory module; a vibration unit 8 is fixed to the support frame 3 through the fixing frame 7. Initially, the support unit 9 is in an extended state. The support unit 9 is used to support the fixing frame 7 to keep the support frame 3 stable, so that the brake accessory module can be placed steadily on the support frame 3. The vibration unit 8 is used to create a vibration state for the brake accessory module, and combined with the work of the air pump 4, it simulates the detection of the brake accessory module in the working state, thereby improving the comprehensiveness of the detection results.

[0024] The working process of the modular detection device for railway freight car brake parts in this embodiment is as follows:

[0025] Preparation before testing:

[0026] First, fix the brake accessory module on the support frame 3, and then connect the first air guide 5 and the second air guide 601 to the joints of the corresponding pipes in the brake accessory module. After the brake accessory module is fixed, start the support unit 9 through the control panel 2, and the support unit 9 contracts to release the support for the fixing frame 7.

[0027] Testing process:

[0028] First, start the air pump 4 through the control panel 2 to continuously inject gas into the brake accessory module, wherein the solenoid valve of the exhaust pipe on the first tank body 6 is in a closed state. During the gas injection process, the control valve in the brake accessory module is opened to allow the gas to flow in the brake accessory module. The flowing gas will enter the first tank body 6 through the brake accessory module and the second air guide 601. The solenoid valve of the exhaust pipe on the first tank body 6 is in a closed state. During the continuous gas injection process, the gas pressure in the brake accessory module and the first tank body 6 gradually increases. During this process, the pressure sensor in the first tank body 6 monitors the gas pressure therein, and the air tightness of the brake accessory module is judged based on the pressure feedback of the pressure sensor on the first tank body 6. During the detection process, as a specified amount of gas is injected into the brake accessory module, the control valve in the brake accessory module is controlled to close, so that the brake accessory module is maintained at a specified pressure for a period of time. During this process, the pressure sensor in the first tank body 6 monitors the gas pressure therein.

[0029] During the detection process, the control panel 2 simultaneously starts the vibration unit 8. The vibration unit 8 causes the fixing frame 7 and the support frame 3 to reciprocate up and down. The reciprocating movement of the support frame 3 causes the brake accessory module on it to vibrate, so that the brake accessory module is detected in a working state, thereby improving the comprehensiveness of the detection results. After the detection is completed, the operator opens the solenoid valve of the exhaust pipe on the first tank body 6, so that the gas in the brake accessory module is discharged from the exhaust pipe of the first tank body 6 through the second air guide member 601. After the gas is exhausted, the connection between the first air guide member 5 and the second air guide member 601 and the joints of the corresponding pipes in the brake accessory module is released. The above operation can be repeated for subsequent detection of the remaining brake accessory modules.

[0030] Example 2: Based on Example 1, Figure 1 、 Figure 3 、 Figure 4 and Figure 6As shown, a quick-connect unit is also included. The quick-connect unit is arranged on the first air guide 5 and the second air guide 601. The quick-connect unit includes two fixing plates 10 (if there are multiple joints in the brake accessory module, a corresponding number of air guides and a corresponding number of fixing plates 10 are provided in this device). The two fixing plates 10 are respectively fixed to the first air guide 5 and the second air guide 601. The first air guide 5 and the second air guide 601 are both slidably provided with a sliding frame 11. Two symmetrically distributed tension springs 111 are fixed between the sliding frame 11 and the adjacent fixing plates 10. , the sliding frame 11 is rotatably provided with two symmetrically distributed swinging members 12, and the end of the swinging member 12 away from the adjacent sliding frame 11 is hook-shaped, and the swinging member 12 is used to limit the upper joint of the corresponding pipe in the brake accessory module; the fixed plate 10 is fixedly connected to the limiting shell 15, and the limiting shell 15 wraps the adjacent tension spring 111. The limiting shell 15 is used to limit the swing of the adjacent swinging members 12 to ensure that the swinging members 12 always contact the upper joint of the corresponding pipe in the brake accessory module; for pipes and joints of different specifications in the accessory module, the first air guide 5 and the second air guide 6 01 and the swinging member 12 change in size accordingly; the first air guide member 5 and the second air guide member 601 are both fixedly connected with a fixing ring 13, which contacts the end face of the corresponding joint in the brake accessory module, and a rubber convex ring is provided on the fixing ring 13 to improve the sealing effect at the fixing ring 13 and the corresponding joint in the brake accessory module; the first air guide member 5 and the second air guide member 601 are both fixedly connected with an elastic sleeve 14, which contacts the inner wall of the corresponding pipe in the brake accessory module, and the elastic sleeve 14 is located in the corresponding pipe of the brake accessory module after installation. The elastic sleeve 14 is provided with an annular bevel, and the annular bevel on the elastic sleeve 14 is used to guide the gas. After the elastic sleeve 14 is installed, as the gas enters the brake accessory module, the gas squeezes the inner wall of the elastic sleeve 14, making it close to the pipeline in the brake accessory module, thereby preventing gas leakage from the connection; the connection between the first air guide 5 and the second air guide 601 and the adjacent elastic sleeves 14 is a step surface, which is used to improve the sealing between the two connections.

[0031] The working process of this embodiment is similar to that of the first embodiment and is described in detail as follows:

[0032] When the first air guide 5 is in the air, the second air guide 5 is in the air. When the first air guide 5 is in the air, the second air guide 5 is in the air. When the first air guide 5 is in the air, the second air guide 5 is in the air. When the first air guide 5 is in the air, the second air guide 5 is in the air. When the first air guide 5 is in the air, the second air guide 5 is in the air. When the first air guide 5 is in the air, the second air guide 5 is in the air. When the first air guide 5 is in the air, the second air guide 5 is in the air. When the first air guide 5 is in the air, the second air guide 5 is in the air. When the first air guide 5 is in the air, the second air guide 5 is in the air. When the first air guide 5 is in the air, the second air guide 5 is in the air. When the first air guide 5 is in the air, the second air guide 5 is in the air.

[0033] After completing the inspection, the operator holds the first air guide 5 and pulls it to move the first air guide 5 away from the corresponding pipe in the brake accessory module. This operation causes the sliding frame 11 and the swinging member 12 to move relative to the first air guide 5 until the limit shell 15 releases contact with the adjacent swinging member 12. The subsequent operator rotates the swinging member 12 to release the contact between the swinging member 12 and the connector in the brake accessory module, and then pulls out the elastic sleeve 14 from the corresponding pipe to complete the disassembly of the test device.

[0034] Example 3: Based on Example 2, Figure 2-Figure 5 As shown, it also includes: a second tank body 16, which is fixed to the upper surface of the workbench 1, and the second tank body 16 is provided with a pressure sensor and an exhaust pipe with an electromagnetic valve installed. The pressure sensor in the second tank body 16 is used to detect the connection of the test device to prevent air leakage of the device from affecting the air tightness test result of the brake accessory module, thereby eliminating the detection error. The second tank body 16 is connected to the hose 401 through a connecting pipe; a fixed sleeve 17, which is fixed to the first air guide member 5, and the fixed sleeve 17 is provided with six circular holes equidistantly distributed in the circumferential direction. The fixed sleeve 17 is slidingly provided with a sliding shell 18, and the sliding shell 18 is provided with six circular holes equidistantly distributed in the circumferential direction. A second spring 19 is fixed between the sliding shell 18 and the first air guide member 5, and the second spring 19 is always in a compressed state. When the circular holes on the sliding shell 18 are aligned with the circular holes on the fixed sleeve 17, the first air guide member 5 is in a connected state.

[0035] The working process of this embodiment is similar to that of the second embodiment and is described in detail as follows:

[0036] In the initial state, the circular holes on the sliding shell 18 are staggered with the circular holes on the fixed sleeve 17. After the first air guide 5 and the second air guide 601 are connected to the corresponding pipes in the brake accessory module, the operation of injecting gas into the brake accessory module is performed. The gas flows in the hose 401 and the second tank body 16. Due to the blocking effect of the sliding shell 18, the gas gathers in the hose 401 and the second tank body 16, causing the pressure in the second tank body 16 to increase. The pressure sensor on the second tank body 16 records the pressure changes. If the pressure continues to increase steadily, it indicates that there is no leakage in the detection device, ensuring the accuracy of the detection results.

[0037] During the process of gas pressure increasing, the gas squeezes the sliding shell 18 to move slowly, and the sliding shell 18 moves to compress the adjacent second spring 19. After the circular hole on the sliding shell 18 and the circular hole on the fixing sleeve 17 are connected, the gas enters the brake accessory module at this time, and then the above detection operation is repeated.

[0038] Example 4: Based on Example 3, Figure 4 and Figure 5 As shown, it also includes: a conduit 20, which is fixedly connected to and communicated with the first air guide 5, and the two ends of the conduit 20 are located on both sides of the sliding shell 18; a sliding plug 21, which is slidably arranged on the conduit 20, and a third spring 22 is fixedly connected between the sliding plug 21 and the first air guide 5, and the third spring 22 is located in the conduit 20. The sliding plug 21 penetrates the first air guide 5 and slides sealed with it. The sliding shell 18 is provided with a step surface. When the sliding plug 21 contacts the step surface of the sliding shell 18, the sliding plug 21 is used to limit the movement of the sliding shell 18, and the sliding plug 21 is always in contact with the surface of the adjacent sliding shell 18.

[0039] The working process of this embodiment is the same as that of embodiment 3, and is described in detail as follows:

[0040] During the gas injection process, the gas enters the conduit 20 through the hose 401 and the first gas guide 5. Due to the blocking effect of the sliding shell 18, the air pressure in the hose 401, the first gas guide 5 and the conduit 20 increases, and the high-pressure gas in the conduit 20 squeezes the sliding plug 21, so that the sliding plug 21 always fits the sliding shell 18. At the same time, the air pressure in the first gas guide 5 squeezes the sliding shell 18 to move. When the circular hole on the sliding shell 18 is connected with the circular hole on the fixed sleeve 17, the step surface of the sliding shell 18 faces the sliding plug 21. Under the action of the high-pressure gas in the conduit 20, the sliding plug 21 moves to compress the third spring 22 and contact the step surface of the sliding shell 18. At this time, the sliding plug 21 restricts the sliding shell 18 from returning to its original position, and the steps in Example 1 are repeated later. The operation is to perform an air tightness test on the brake accessory module. After the test is completed, the solenoid valve of the exhaust pipe on the second tank body 16 and the solenoid valve of the exhaust pipe on the first tank body 6 are started through the control panel 2 to perform a pressure relief operation on the brake accessory module. During this process, part of the gas in the brake accessory module is discharged from the exhaust pipe on the first tank body 6, and the other part of the gas enters the second tank body 16 through the first air guide 5, the circular hole on the sliding shell 18, the circular hole on the fixing sleeve 17 and the hose 401. The subsequent gas is discharged from the exhaust pipe on the second tank body 16, so that the gas in the brake accessory module is discharged from both ends, and the gas in the brake accessory module is discharged evenly, which is convenient for the subsequent detection of other brake accessory modules by this device and improves the detection efficiency.

[0041] Example 5: Based on Example 4, Figure 4-Figure 6 As shown, it also includes: a connecting frame 23, which is fixed to the sliding shell 18, and the connecting frame 23 is composed of a connecting rod and a circular ring. The circular ring on the connecting frame 23 is provided with an annular inclined surface; an elastic ring 24, which is fixed to the elastic sleeve 14 connected to the first air guide 5, and the elastic ring 24 is made of rubber. An annular chamber filled with gas is provided in the elastic ring 24, and the annular inclined surface of the circular ring on the connecting frame 23 is used to squeeze the elastic ring 24.

[0042] The working process of this embodiment is the same as that of the fourth embodiment, and is described in detail as follows:

[0043] During the movement of the sliding shell 18, the sliding shell 18 drives the connecting frame 23 to move together. The movement of the connecting frame 23 causes the annular inclined surface of the upper ring to squeeze the elastic ring 24. The elastic ring 24 is compressed and expanded. The elastic ring 24 squeezes the adjacent elastic sleeve 14 to expand outward, thereby strengthening the sealing between the elastic sleeve 14 and the adjacent pipes in the brake accessory module, and preventing gas leakage from the connection.

[0044] Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A modular detection device for railway freight car brake parts, characterized in that: The invention comprises a workbench (1), wherein the workbench (1) is fixedly connected with a control panel (2), an air pump (4), a first tank body (6) and a support unit (9), wherein the first tank body (6) is provided with a pressure sensor and an exhaust pipe for installing a solenoid valve, and the workbench (1) is slidably provided with a support frame (3) for fixing a brake accessory module, and a first spring (301) is installed between the support frame (3) and the workbench (1), and an air outlet end of the air pump (4) is connected to a first air guide member (5) through a hose (401), and the first tank body (6) is connected to a second air guide member (601), and both the first air guide member (5) and the second air guide member (601) are used to communicate with corresponding pipes on the brake accessory module; A vibration unit (8) is fixedly connected to the support frame (3) via a fixing frame (7); the support unit (9) is used to support the fixing frame (7); and the vibration unit (8) is used to create a vibration state for the brake accessory module; A quick-connect unit, the quick-connect unit is arranged on the first air guide (5) and the second air guide (601), the quick-connect unit includes two fixed plates (10), the two fixed plates (10) are respectively fixed to the first air guide (5) and the second air guide (601), the first air guide (5) and the second air guide (601) are both slidably provided with a sliding frame (11), a tension spring (111) is fixed between the sliding frame (11) and the adjacent fixed plate (10), the sliding frame (11) is rotatably provided with two symmetrically distributed swinging members (12), the end of the swinging member (12) away from the adjacent sliding frame (11) is hook-shaped, and the swinging member (12) is used to limit the corresponding pipeline in the brake accessory module; A second tank body (16) is fixedly connected to the workbench (1), and the second tank body (16) is provided with a pressure sensor and an exhaust pipe for installing a solenoid valve, and the second tank body (16) is connected to the hose (401) through a connecting pipe; a fixed sleeve (17) is fixedly connected to the first air guide (5), and the fixed sleeve (17) is provided with a plurality of circular holes, and the fixed sleeve (17) is slidably provided with a sliding shell (18), and the sliding shell (18) is provided with a plurality of circular holes. A second spring (19) is fixedly connected between the sliding shell (18) and the first air guide (5), and when the circular holes on the sliding shell (18) are aligned with the circular holes on the fixed sleeve (17), the first air guide (5) is in a connected state.

2. A modular detection device for railway freight car brake parts according to claim 1, characterized in that: The first air guide (5) and the second air guide (601) are both fixedly connected to a fixing ring (13), the fixing ring (13) is in contact with a corresponding pipe in the brake accessory module, and a rubber convex ring is provided on the fixing ring (13).

3. A modular detection device for railway freight car brake parts according to claim 2, characterized in that: The first air guide (5) and the second air guide (601) are both fixedly connected with an elastic sleeve (14), and the elastic sleeve (14) is in contact with the inner wall of the corresponding pipe in the brake accessory module.

4. A modular detection device for railway freight car brake parts according to claim 3, characterized in that: The elastic sleeve (14) is provided with an annular inclined surface, and the annular inclined surface of the elastic sleeve (14) is used to guide the gas.

5. A modular detection device for railway freight car brake parts according to claim 4, characterized in that: The fixed plate (10) is fixedly connected to a limiting shell (15), and the limiting shell (15) is used to limit the swinging of the adjacent swinging member (12).

6. A modular detection device for railway freight car brake parts according to claim 5, characterized in that: The connection points between the first air guide (5) and the second air guide (601) and the adjacent elastic sleeves (14) are stepped surfaces.

7. A modular detection device for railway freight car brake parts according to claim 6, characterized in that: Also included are: A conduit (20) is fixedly connected to and communicated with the first air guide member (5); A sliding plug (21) is slidably arranged on the conduit (20), a third spring (22) is fixedly connected between the sliding plug (21) and the first air guide (5), the sliding plug (21) penetrates the first air guide (5) and slides sealed therewith, the sliding shell (18) is provided with a step surface, and when the sliding plug (21) contacts the step surface of the sliding shell (18), the sliding plug (21) is used to limit the movement of the sliding shell (18).

8. A modular detection device for railway freight car brake parts according to claim 7, characterized in that: Also included are: A connecting frame (23) is fixedly connected to the sliding shell (18), and the connecting frame (23) is provided with an annular inclined surface; An elastic ring (24) is fixedly connected to the elastic sleeve (14) connected to the first air guide (5), and the annular inclined surface of the connecting frame (23) is used to squeeze the elastic ring (24).

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