Brake pad gap detection system for railway vehicle

Abstract

The invention provides a railway vehicle brake pad gap detection system, which comprises a gap detection device and a control system, and is characterized in that the gap detection device comprises a gap detection base which comprises a mounting platform and a supporting piece for supporting the mounting platform; the negative pressure suspension frame is provided with an elastic assembly and a negative pressure suction cup used for adsorbing the brake pad; the joint measuring cantilever is provided with an elastic connecting piece and a fixed connecting piece, and the joint measuring cantilever is in floating connection with the negative pressure suspension through the elastic connecting piece; the seam measuring device is fixedly connected to the fixed connecting piece and comprises a distance measuring sensor, a motion executing mechanism, an encoder and a seam detecting ruler which are in communication connection with the control system, the distance measuring sensor is used for detecting the position of a workpiece seam and centering the seam, and the encoder is used for detecting the initial position depth and the final position depth of the seam; and the motion executing mechanism is used for driving the seam probing ruler to be inserted into or withdrawn from the seam and forms a closed-loop control signal with the encoder and the control system. The device and the method can be suitable for various types of railway vehicle brake pads, and high-precision and automatic detection of gaps is realized.

Description

Technical Field

[0001] The present application relates to the technical field of rail vehicles, and more specifically, to a rail vehicle brake pad gap detection system. Background Art

[0002] Accurately measuring the gap between the brake pad and the brake support is a critical inspection item during rail vehicle maintenance. Currently, gap measurement is mostly performed manually using a feeler gauge or using sensor scanning combined with software. However, both measurement methods have limitations: manual measurement is prone to human error, resulting in large accuracy deviations, uncertainty in measurement accuracy, and low measurement efficiency. Sensor scanning can only measure the dimensions of the gap notch and cannot accurately measure gaps of a certain depth. Summary of the Invention

[0003] The present application provides a rail vehicle brake pad gap detection system, which can achieve accurate and efficient detection of the rail vehicle brake pad gap.

[0004] The present application provides a rail vehicle brake pad gap detection system, comprising a gap measuring device and a control system communicatively connected to the gap measuring device, wherein the gap measuring device comprises:

[0005] The joint measuring base comprises a mounting platform and a support member for supporting the mounting platform;

[0006] A negative pressure suspension, wherein the negative pressure suspension is provided with an elastic component and a negative pressure suction cup, the negative pressure suspension is floatingly connected to the mounting platform through the elastic component, and the negative pressure suction cup is used to adsorb the brake pad;

[0007] A joint measuring cantilever, wherein the joint measuring cantilever is provided with an elastic connecting piece and a fixed connecting piece, and the joint measuring cantilever is floatingly connected to the negative pressure suspension through the elastic connecting piece;

[0008] A joint meter is fixedly connected to the fixed connecting member, and includes a distance measuring sensor, a motion actuator and an encoder communicatively connected to the control system, and a joint probe drivingly connected to the motion actuator. The front end of the joint probe facing the gap is provided with a sloped surface. The distance measuring sensor is used to detect the position of the gap in the workpiece and center the gap. The encoder is used to detect the depth of the initial position of the gap and the depth of the end position of the gap. The motion actuator is used to drive the joint probe to insert into the gap or withdraw from the gap, and form a closed-loop control signal with the encoder and the control system.

[0009] In some embodiments, the seam measuring cantilever comprises an arc-shaped cantilever, a first end of the cantilever is connected to the fixed connector, and a second end of the cantilever is connected to the elastic connector.

[0010] In some embodiments, the negative pressure suspension includes a floating plate and at least two negative pressure suction cups, a mounting hole is provided at the center of the floating plate, a bushing is provided in the mounting hole and a positioning shaft is provided in the bushing, the positioning shaft is fixedly connected to the mounting platform and the floating plate, a first elastic connecting member is mounted on the positioning shaft, and each of the negative pressure suction cups is symmetrically distributed relative to the positioning axis.

[0011] In some embodiments, the elastic component further includes a plurality of second screws and a plurality of second elastic connectors, the two ends of the second screws being respectively fixedly connected to the mounting platform and the negative pressure suspension, and each second elastic connector being sleeved on each second screw.

[0012] In some embodiments, the second elastic connecting members are respectively disposed at four corners of the floating plate and are symmetrically distributed relative to the positioning axis.

[0013] In some embodiments, the cantilever is provided with a plurality of weight-reducing holes, and the plurality of weight-reducing holes are distributed on the cantilever at equal intervals.

[0014] In some embodiments, the motion actuator includes: a linear guide; a slider, the slider is slidably connected to the linear guide; a rack and a gear, the rack is fixed to the slider, and the rack is transmission-connected to the gear; a stepper motor and a reducer, and the drive shaft of the reducer is connected to the gear.

[0015] In some embodiments, the distance measuring sensor is a laser distance measuring sensor, an infrared distance measuring sensor, or an optical fiber distance measuring sensor.

[0016] In some embodiments, the crack probe is provided with scale lines.

[0017] In some embodiments, the control system includes a PLC system and a touch screen. The PLC system is used to receive and process data signals from the ranging sensor and the encoder, and control the action of the stepper motor. The touch screen is connected to the PLC system and is used to output detection results.

[0018] In an embodiment of the present application, the distance measuring sensor, motion actuator, and encoder in the gap measuring device cooperate with each other to detect the gap position of the workpiece in real time and realize automatic centering, ensure that the gap probe is aligned with the gap, and realize accurate insertion and withdrawal of the gap probe. The sensor centering is combined with the encoder displacement feedback, and the gap measuring device and the control system form a closed-loop control signal, which can realize efficient and high-precision detection of the gap between the bogie brake pad and the brake pad holder of the rail vehicle, thereby improving the measurement accuracy. The gap measuring device uses a negative pressure suction cup to absorb the brake pad and uses an elastic component and an elastic connector to achieve a floating connection, thereby providing space for the movement of the gap probe. The position of the gap probe can be flexibly adjusted so that the gap probe can move to the maximum gap position of non-uniformly spaced gaps, reducing measurement errors and further ensuring measurement accuracy. It is particularly suitable for measuring non-uniformly spaced gaps. Therefore, the rail vehicle brake pad gap detection system provided by the present application, with full-process sensor centering combined with encoder displacement feedback, realizes efficient, accurate and automated control of gap detection, and can be applied to high-precision detection of brake pad gaps of various types of rail vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0020] Figure 1 A schematic diagram of the structure of a rail vehicle brake pad gap detection system provided in some embodiments of the present application;

[0021] Figure 2 A schematic structural diagram of a gap measuring base in a rail vehicle brake pad gap detection system provided in some embodiments of the present application;

[0022] Figure 3 A schematic diagram of the structure of a floating plate in a rail vehicle brake pad gap detection system provided in other embodiments of the present application;

[0023] Figure 4 A schematic structural diagram of a negative pressure suspension in a rail vehicle brake pad gap detection system provided in other embodiments of the present application;

[0024] Figure 5 A schematic diagram of the structure of a gap detector in a rail vehicle brake pad gap detection system provided in other embodiments of the present application;

[0025] Figure 6 A schematic structural diagram of a gap detector in a rail vehicle brake pad gap detection system according to other embodiments of the present application from another angle;

[0026] Figure 7 This is a schematic diagram of the interior of a gap detector in a rail vehicle brake pad gap detection system provided in other embodiments of the present application.

[0027] The reference numerals are as follows:

[0028] 1- seam measuring device;

[0029] 11- seam measuring base; 12- negative pressure suspension; 13- seam measuring cantilever; 14- seam measuring device;

[0030] 111-Mounting platform; 112-Support; 121-Floating plate; 122-Negative pressure suction cup; 123-Elastic component; 124-Sleeve; 125-Positioning shaft; 126-First elastic connector; 131-Cantilever; 132-Fixed connector; 133-Third elastic connector; 134-First screw; 141-Seam measuring box; 142-Distance measuring sensor; 143-Encoder; 144-Seam probe; 145-Stepping motor; 146-Reducer; 147-Linear guide; 148-Slider; 149-Rack; 150-Gear;

[0031] 1231 - second screw; 1232 - second elastic connecting piece; 1311 - weight-reducing hole; 1441 - slope surface. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0033] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in this application and in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. The terms "first" and "second" in this application are used to distinguish different objects, not to describe a specific order or a primary-secondary relationship.

[0034] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0036] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0037] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0038] The term "plurality" used in this application refers to two or more (including two).

[0039] Please refer to Figure 1 , Figure 1 This is a structural schematic diagram of the rail vehicle brake pad gap detection system provided in this application.

[0040] The present application provides a rail vehicle brake pad gap detection system, comprising a gap measuring device 1 and a control system. The gap measuring device 1 is connected to the control system via a cable communication, or is wirelessly connected to the control system.

[0041] The joint measuring device 1 can be manually or mechanically grasped to place the entire joint measuring device 1 above the workpiece. The joint measuring device 1 includes a joint measuring base 11, a negative pressure suspension 12, a joint measuring cantilever 13 and a joint meter 14. The joint measuring base 11 includes a mounting platform 111 and a support 112. The mounting platform 111 of the joint measuring base 11 is used to install the joint measuring cantilever 13, the negative pressure suspension 12 and the joint meter 14, as well as to position the joint meter 14 to ensure the stability of the entire joint measuring device 1. The support 112 is provided at the bottom of the mounting platform 111 to provide stable support for the mounting platform 111 and to ensure that the support 112 is supported on the surface of the workpiece. The joint measuring base can rotate 360° to facilitate the joint meter 14 to perform joint measurement on the workpiece.

[0042] The joint measuring base 11 , the negative pressure suspension 12 , the joint measuring cantilever 13 and the joint measuring device 14 can be integrated and installed in the joint measuring hanging box 141 to reduce the occupied space and improve the detection accuracy.

[0043] Please refer to Figure 4 , the negative pressure suspension 12 is provided with an elastic component 123 and a negative pressure suction cup 122. An elastic component 123 is provided between the negative pressure suspension 12 and the mounting platform 111, and the negative pressure suspension 12 is floatingly connected to the mounting platform 111 through the elastic component 123. The elastic component 123 can adopt elastic elements such as springs, so that the negative pressure suspension 12 can float within a certain height range and adjust its position in the gap. The negative pressure suction cup 122 is fixed on the negative pressure suspension 12 and is used to adsorb the gate piece before the gap is measured. The elastic component 123 and the negative pressure suction cup 122 can provide a rebound force for the gap probe 144, and move the gap probe 144 to the target height of the gap of the workpiece to be detected for detection, such as the maximum height, so as to better adapt to the gap of gate pieces of different shapes and positions, so as to ensure the accuracy of the gap detection by the gap detector 14.

[0044] Please refer to Figure 3 , and combined with Figure 1 The joint measuring cantilever 13 is provided with a third elastic connector 133 and a fixed connector 132. The joint measuring cantilever 13 is floatingly connected to the negative pressure suspension 12 via the third elastic connector 133. The third elastic connector 133 can be an elastic element such as a spring or rubber. The third elastic connector 133 is mounted on the first screw 134, allowing the joint measuring cantilever 13 to float freely within a certain height range.

[0045] like Figure 1As shown. The seam measuring device 14 is fixedly connected to the fixed connecting member 132. The seam measuring device 14 includes a distance measuring sensor 142, a motion actuator, an encoder 143 and a seam probe 144 which are connected to the communication control system. The seam probe 144 drives the connection motion actuator. The front end of the seam probe 144 facing the gap is provided with a slope surface 1441 to facilitate the insertion of the seam probe 144 into the gap. The distance measuring sensor 142 is used to detect the position of the gap of the workpiece and to center the gap. The encoder 143 is used to detect the depth of the initial position of the gap and the depth of the end position of the gap. The motion actuator drives the seam probe 144 to insert into the gap or withdraw from the gap, and the motion actuator forms a closed-loop control signal with the encoder 143 and the control system to ensure the accurate movement and detection of the seam probe 144.

[0046] The gap detection steps for this application are as follows:

[0047] Step 1: Initialize the calibration distance sensor 142, motion actuator and encoder 143 through the control system to ensure that the system is in normal working state.

[0048] Step 2: The gate piece is sucked by the negative pressure suction cup 122 on the negative pressure suspension 12 to ensure that the gap probe 144 can be inserted into the gap.

[0049] Step 3: The distance measuring sensor 142 detects the position of the gap in the workpiece and aligns the gap to ensure that the gap probe 144 can be accurately inserted into the gap.

[0050] In step 4, the distance measuring sensor 142 detects the gap of the workpiece and aligns it. The motion actuator drives the gap probe 144 to insert into the gap according to the instructions of the control system. The encoder 143 detects the depth of the initial position of the gap and the depth of the end position of the gap in real time, and feeds back the depth data to the control system. The control system calculates the width of the gap based on the data fed back by the encoder 143.

[0051] The control system automatically determines whether the test result is qualified based on the calculated width and the preset standard gap width, and displays the result on the touch screen. If the test result fails, an alarm signal is issued to provide an alert. The test data is automatically saved in the control system and can be uploaded to the server for subsequent data analysis and traceability.

[0052] This application can be used for rail vehicle bogie brake pads and other equipment that requires gap measurement, such as urban rail and EMU. It has both manual and automatic operation modes. Control parameters can be manually input or preset through a handheld mobile device, based on built-in control software. The seam detector 14 has a wireless network control function, and the detection items are artificially intelligent.

[0053] Please refer to Figure 5 、 Figure 6 and Figure 7 The motion actuator includes a linear guide 147, a slider 148, a rack 149, a gear 150, a stepper motor 145, and a reducer 146. The slider 148 is slidably connected to the linear guide 147, the rack 149 is fixedly connected to the slider 148, and the rack 149 is transmission-connected to the gear 150. The drive shaft of the reducer 146 is connected to the gear 150. The stepper motor 145 drives the reducer 146 to operate, thereby driving the gear 150 and the rack 149 to move, realizing the insertion and withdrawal of the gap probe 144.

[0054] After the distance measuring sensor 142 detects that the gap probe 144 is centered on the workpiece gap, the control system issues an instruction to control the stepper motor 145 to start running. The stepper motor 145 drives the gear 150 to rotate, and the gear 150 drives the rack 149 to move, thereby driving the gap probe 144 to move forward. It moves forward continuously when it reaches the target depth of the gap until the gap probe 144 stops automatically. The encoder 143 feeds back the displacement signal to the control system.

[0055] The distance measuring sensor 142 may be a laser distance measuring sensor 142 , an infrared distance measuring sensor 142 , or an optical fiber distance measuring sensor 142 , which has a high-precision distance measuring function.

[0056] Optionally, the front end of the gap probe 144 is provided with a sloped surface 1441 to facilitate insertion into the gap. The outer wall of the gap probe 144 is provided with scale lines to facilitate intuitive reading of the gap width. The scale lines, combined with the data from the encoder 143, provide dual verification of the gap width, ensuring detection accuracy.

[0057] Optionally, the angle between the slope surface 1441 of the crack probe 144 and the top horizontal plane is between 5° and 80°, and can be 20°.

[0058] In one specific embodiment, the control system includes a PLC system and a touch screen. The PLC system receives and processes signals from the distance sensor 142 and encoder 143, controls the operation of the stepper motor 145, and calculates and outputs detection results. The touch screen is used to set detection parameters, display detection data, and generate alarm messages. The encoder 143 records displacement in real time, and the PLC calculates the actual gap width by combining the depth data measured by the encoder 143 with the depth data from the initial alignment. This width data is compared with a preset standard to determine whether the gap meets the requirements. The result is displayed in real time on the touch screen, and an automatic alarm can be triggered.

[0059] Therefore, this application is based on multi-sensor technology based on laser, infrared or fiber alignment combined with encoder 143 displacement feedback, with controllable error, high measurement accuracy and good reliability. The cantilever can rotate at any angle and set unlimited detection points to adapt to complex workpiece layouts.

[0060] refer to Figure 3 . In a specific embodiment, the gap measuring cantilever 13 includes a cantilever 131, and the cantilever 131 is arc-shaped. The arc-shaped design enables the cantilever 131 to better adapt to the detection requirements of different angles during movement, and the rotation angle can be determined according to the position of the workpiece. The rotation angle of the cantilever 131 is any angle, and the system only needs to issue an instruction. The detection point can be set arbitrarily without restrictions, and the rotation angle of the cantilever 131 can be rotated manually or by machine. The first end of the cantilever 131 is connected to the fixed connector 132, and the second end of the cantilever 131 is connected to the elastic connector. The cantilever 131 can rotate at an angle to meet the detection requirements of the gate gap.

[0061] Furthermore, the cantilever 131 is provided with a plurality of weight-reducing holes 1311 , which are evenly spaced on the cantilever 131 , so as to reduce the weight of the seam measuring cantilever 13 and improve the flexibility of the movement.

[0062] The negative pressure suspension 12 includes a floating plate 121 and at least two negative pressure suction cups 122. A mounting hole is provided in the center of the floating plate 121, within which is a shaft sleeve 124. A positioning shaft 125 is disposed within the shaft sleeve 124. One end of the positioning shaft 125 is fixedly mounted on the mounting platform 111, while the other end of the positioning shaft 125 can be movable or fixedly connected to the floating plate 121. A first elastic connector 126 is mounted on the positioning shaft 125, and the negative pressure suction cups 122 are symmetrically distributed relative to the positioning shaft 125, thereby ensuring the stability and symmetry of the negative pressure suspension 12, as well as uniform suction force.

[0063] In a specific embodiment, the elastic component 123 also includes a plurality of second screws 1231 and a plurality of second elastic connecting members 1232, the two ends of the second screws 1231 are respectively fixed to the mounting platform 111 and the negative pressure suspension 12, and each second elastic connecting member 1232 is respectively mounted on each second screw 1231.

[0064] Specifically, the negative pressure suspension 12 is a rectangular plate structure, and the number of the second screw 1231 and the second elastic connecting member 1232 is four, respectively arranged at the four corners of the floating plate 121, and symmetrically distributed relative to the central axis of the positioning shaft 125 to form a uniform floating structure, ensuring the stability and flexibility of the negative pressure suspension 12 and improving the uniformity and reliability of adsorption.

[0065] In one specific embodiment, the motion actuator includes a linear guide 147, a slider 148, a rack 149, a gear 150, a stepper motor 145, and a reducer 146. The linear guide 147 can be fixedly mounted in the chamber of the joint measuring box 141. The slider 148 is slidably connected to the linear guide 147. The rack 149 is fixedly mounted on the slider 148. The rack 149 is transmission-connected to the gear 150. The drive shaft of the reducer 146 is also connected to the gear 150. This structure enables the gap probe 144 to be precisely inserted and removed from the gap, ensuring accurate and reliable detection.

[0066] The distance measuring sensor 142 may be a laser distance measuring sensor 142 or an infrared distance measuring sensor 142. The laser distance measuring sensor 142 or the infrared distance measuring sensor 142 can accurately detect the position of the gap and realize automatic centering, thereby improving the automation and accuracy of detection.

[0067] In practical applications, operators can control the detection device's software using a handheld mobile terminal or touch screen to detect the gap between the bogie brake pad and the pad holder. The detection system offers both manual and automatic operation modes. By setting a standard gap width, the control system determines whether the test result is acceptable based on pre-set parameters. Test data can be transmitted to the control system via wired or wireless means for storage and query, ensuring traceability of test results.

[0068] To sum up, the rail vehicle brake pad gap detection system provided in the embodiment of the present application has the advantages of high efficiency, accuracy, easy operation, and high intelligence. It can meet the needs of brake pad gap detection in rail vehicle maintenance operations, improve maintenance efficiency and quality, and ensure the safe operation of rail vehicles.

[0069] The above is a detailed introduction to the rail vehicle brake pad gap detection system provided by this application. This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only intended to help understand the method and core concept of this application. It should be noted that for ordinary technicians in this technical field, without departing from the principles of this application, various improvements and modifications can be made to this application, and these improvements and modifications also fall within the scope of protection of this application.

Claims

1. A rail vehicle brake pad gap detection system, characterized in that: The invention comprises a joint measuring device (1) and a control system communicatively connected to the joint measuring device (1), wherein the joint measuring device (1) comprises: A joint measuring base (11) comprising a mounting platform (111) and a support member (112) for supporting the mounting platform (111); A negative pressure suspension (12), the negative pressure suspension (12) being provided with an elastic component (123) and a negative pressure suction cup (122), the negative pressure suspension (12) being floatingly connected to the mounting platform (111) via the elastic component (123), and the negative pressure suction cup (122) being used for adsorbing the brake pad; A joint measuring cantilever (13), the joint measuring cantilever (13) being provided with an elastic connecting piece and a fixed connecting piece (132), the joint measuring cantilever (13) being floatingly connected to the negative pressure suspension (12) via the elastic connecting piece; A seam measuring device (14) is fixedly connected to the fixed connecting member (132), and the seam measuring device (14) includes a distance measuring sensor (142) communicatively connected to the control system, a motion actuator and an encoder (143), and a seam probe (144) drivingly connected to the motion actuator, wherein the front end of the seam probe (144) facing the seam is provided with a slope surface (1441), the distance measuring sensor (142) is used to detect the position of the seam of the workpiece and center the seam, the encoder (143) is used to detect the depth of the initial position of the seam and the depth of the end position of the seam, and the motion actuator is used to drive the seam probe (144) to insert into the seam or withdraw from the seam, and form a closed-loop control signal with the encoder (143) and the control system.

2. The rail vehicle brake pad gap detection system according to claim 1, characterized in that: The seam measuring cantilever (13) comprises an arc-shaped cantilever (131), a first end of the cantilever (131) is connected to the fixed connecting member (132), and a second end of the cantilever (131) is connected to the elastic connecting member.

3. The rail vehicle brake pad gap detection system according to claim 2, characterized in that: The negative pressure suspension (12) includes a floating plate (121) and at least two negative pressure suction cups (122), a mounting hole is provided at the center of the floating plate (121), a shaft sleeve (124) is provided in the mounting hole, and a positioning shaft (125) is provided in the shaft sleeve (124), the positioning shaft (125) is fixedly connected to the mounting platform (111) and the floating plate (121), a first elastic connecting member (126) is mounted on the positioning shaft (125), and each of the negative pressure suction cups (122) is symmetrically distributed relative to the positioning shaft (125).

4. The rail vehicle brake pad gap detection system according to claim 3, characterized in that: The elastic component (123) further comprises a plurality of second screws (1231) and a plurality of second elastic connectors (1232), wherein the two ends of the second screws (1231) are respectively fixedly connected to the mounting platform (111) and the negative pressure suspension (12), and each second elastic connector (1232) is sleeved on each second screw (1231).

5. The rail vehicle brake pad gap detection system according to claim 4, characterized in that: Each of the second elastic connecting members (1232) is respectively arranged at the four corners of the floating plate (121) and is symmetrically distributed relative to the positioning axis (125).

6. The rail vehicle brake pad gap detection system according to any one of claims 2 to 5, characterized in that: The cantilever (131) is provided with a plurality of weight-reducing holes (1311), and the plurality of weight-reducing holes (1311) are distributed at equal intervals on the cantilever (131).

7. The rail vehicle brake pad gap detection system according to claim 1, characterized in that: The motion execution mechanism includes: Linear guide rail (147); A slider (148), the slider (148) being slidably connected to the linear guide rail (147); A rack (149) and a gear (150), wherein the rack (149) is fixedly connected to the slider (148), and the rack (149) is transmission-connected to the gear (150); A stepper motor (145) and a reducer (146), wherein a drive shaft of the reducer (146) is connected to the gear (150).

8. The rail vehicle brake pad gap detection system according to claim 1, characterized in that: The distance measuring sensor (142) is a laser distance measuring sensor, an infrared distance measuring sensor, or an optical fiber distance measuring sensor.

9. The rail vehicle brake pad gap detection system according to claim 1, characterized in that: The crack detection ruler (144) is provided with scale lines.

10. The rail vehicle brake pad gap detection system according to claim 7, characterized in that: The control system includes a PLC system and a touch screen. The PLC system is used to receive and process data signals from the distance measuring sensor (142) and the encoder (143), and to control the action of the stepping motor (145). The touch screen is connected to the PLC system and is used to output detection results.

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