Device and method for detecting rail transit vehicle body bottom equipment limit

Abstract

The invention discloses a device and a method for detecting rail transit vehicle body bottom equipment clearance, solves the problems of low efficiency and low precision in rail transit vehicle body bottom equipment clearance detection in the prior art, and has the beneficial effects of high efficiency and convenience in observation. According to the specific scheme, the device for detecting the rail transit vehicle body bottom equipment limit comprises a plurality of rails, the rail transit vehicle body can pass along the rails, the rails are erected at high positions, a first space is arranged between every two adjacent rails, the bottom of each first space is lower than the corresponding rail, and a limit detection assembly is arranged at the bottom of each first space; the limit detection assembly comprises a supporting frame, the height of the supporting frame is adjustable, the supporting frame can move along the bottom of the first space, the supporting frame supports a first infrared gradienter or a first laser transmitter, and infrared rays emitted by the first infrared gradienter or laser emitted by the first laser transmitter are parallel to the length direction of the track.

Description

Technical Field

[0001] The present invention relates to the field of rail transit technology, and in particular to a device and method for detecting the limit of equipment at the bottom of a rail transit vehicle body. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] In the process of manufacturing rail transit vehicle bodies, vehicle clearance detection devices are often used. Specifically, the vehicle clearance detection devices are used in the vehicle clearance inspection process to check the vehicle contour and confirm whether the contours of the top and sides of the vehicle exceed the limits. Due to the construction site, the clearance inspection of the bottom equipment of the vehicle, such as the bogie area, cannot be carried out, resulting in production suspension and the inability to carry out the next production plan;

[0004] To this end, in the prior art, during the limit inspection for the bogie area at the bottom of the rail transit car body, workers are usually required to lie flat on the bottom of the car body to measure and confirm whether the limit is exceeded. The inventors found that this measurement method mainly relies on the workers to measure and observe with their eyes, and the rail transit car body is long and has many carriages, which has the problems of high labor intensity and low efficiency; and the workers lying on the bottom of the car body for a long time to observe are prone to fatigue and observation errors, thereby increasing the risk of rail transit car body operation process. Summary of the invention

[0005] In view of the deficiencies in the prior art, an object of the present invention is to provide a device for detecting the limits of equipment at the bottom of a rail transit vehicle body, so as to quickly determine whether the equipment at the bottom of a rail transit vehicle body has exceeded the limits.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] A device for detecting the limit of equipment at the bottom of a rail transit vehicle body, comprising a plurality of tracks, along which the rail transit vehicle body can pass, the tracks being erected at a high place, a first space being arranged between two adjacent tracks, the bottom of the first space being arranged lower than the track, and a limit detection component being arranged at the bottom of the first space;

[0008] The limit detection component includes a support frame, the height of the support frame is adjustable, the support frame can move along the bottom of the first space, the support frame supports a first infrared level or a first laser emitter, the infrared rays emitted by the first infrared level or the laser emitted by the first laser emitter are parallel to the length direction of the track, and the infrared rays emitted by the first infrared level or the laser emitted by the first laser emitter are higher than a set height than the track surface.

[0009] A device for detecting the limits of equipment at the bottom of a rail transit vehicle body as described above also includes a second detection component, which is arranged on the outside of the track. The second detection component includes a second infrared level meter or a second laser emitter. The infrared rays emitted by the second infrared level meter or the laser emitted by the second laser emitter are flush with the track surface, so as to determine the height of the infrared rays emitted by the first infrared level meter or the laser emitted by the first laser emitter through the second detection component.

[0010] The device for detecting the limit of the bottom equipment of a rail transit vehicle body as described above, each of the rails is supported by a plurality of support piers, and the distance between two adjacent support piers supporting the same rail is set, and the width of the support pier is greater than the width of the rail;

[0011] The second detection component is fixed to the top or outside of the supporting pier. The second detection component emits infrared rays or lasers toward the first space. The second detection component emits infrared rays or lasers. The infrared rays or lasers emitted by the second detection component are flush with the track surface. When the limit detection component also emits infrared rays or lasers for limit, the two infrared rays or two lasers intersect in space. The distance between the two infrared rays or two lasers is measured by a measuring ruler to determine the height of the infrared rays emitted by the first infrared level or the first laser emitter from the track surface.

[0012] As described above, in the device for detecting the limit of equipment at the bottom of a rail transit vehicle body, the second detection component also includes a support rod with adjustable height, and the top of the support rod supports the second infrared level meter or the second laser emitter.

[0013] The device for detecting the limit of equipment at the bottom of a rail transit vehicle body as described above, wherein a guide rail is provided at the bottom of the first space, the guide rail and the track are parallel to each other, and a guide wheel is provided at the bottom of the support frame, and the guide wheel can move along the guide rail;

[0014] The guide wheel is a lockable wheel. After the clearance detection component reaches the set position, the lockable wheel can be locked to prevent the clearance detection component from moving during the detection process, thereby ensuring the accuracy of the detection.

[0015] As described above, a device for detecting the limits of equipment at the bottom of a rail transit vehicle body, the support frame includes a platform, a plurality of support legs are arranged on the bottom side of the platform, a support column with adjustable height is arranged on the top side of the platform, a mounting seat is arranged on the top of the support column, and the mounting seat is connected to the first infrared level meter or the first laser emitter.

[0016] The device for detecting the limit of the bottom equipment of a rail transit vehicle body as described above, wherein the mounting seat is provided with a mounting groove, and the mounting seat is provided with mounting holes on both sides of the mounting groove, and the bottom side of the first infrared level meter or the first laser transmitter is inserted into the mounting groove;

[0017] A fixing plate is arranged on the side of the first infrared level or the first laser emitter, an opening is arranged on the fixing plate, and a first fastener passes through the opening of the fixing plate and the mounting hole to achieve a stable connection between the first infrared level or the first laser emitter and the mounting seat.

[0018] As described above, in a device for detecting the limits of equipment at the bottom of a rail transit vehicle body, a level is fixed on the top side of the first infrared level or the first laser emitter, and the level of the first infrared level or the first laser emitter can be determined by the level to ensure the level of the emitted infrared or laser.

[0019] The device for detecting the limit of equipment at the bottom of a rail transit vehicle body as described above, wherein the support column is an electric telescopic rod, the fixed end of the electric telescopic rod is connected to the platform, and the movable end of the electric telescopic rod is connected to the mounting seat;

[0020] Alternatively, the support column includes a plurality of support tubes which are sequentially mounted, and two adjacent sections of the support tubes are connected by a second fastener.

[0021] In a second aspect, the present invention further provides a method for detecting the limit of equipment at the bottom of a rail transit vehicle body, using the device for detecting the limit of equipment at the bottom of a rail transit vehicle body, comprising the following contents:

[0022] Move the rail transit vehicle body whose bottom equipment limit is to be tested to the track;

[0023] A clearance detection component is arranged between two adjacent tracks, the clearance detection component is placed under a carriage, and a first infrared level meter or a first laser transmitter is arranged on the clearance detection component, and the infrared rays emitted by the first infrared level meter or the laser emitted by the first laser transmitter are along the length direction of the track;

[0024] By adjusting the height of the support frame, the infrared light emitted by the first infrared level meter or the laser light emitted by the first laser transmitter is higher than the track surface by a set height;

[0025] The staff standing behind the clearance detection component can quickly determine the clearance situation of the equipment at the bottom of the rail transit vehicle body through infrared or laser;

[0026] The rail transit vehicle body or the mobile clearance detection component is moved along the track so that the clearance detection component is placed under the next carriage to continue the judgment.

[0027] The beneficial effects of the present invention are as follows:

[0028] 1) The device of the present invention provides that the track is erected, the rail transit vehicle body can move along the track, a first space is set between two adjacent tracks, and the bottom of the first space is set lower than the track, so that a limit detection component can be set at the first space, and the limit detection component includes a first infrared level meter or a first laser transmitter, and the infrared or laser emitted by the limit detection component is set higher than the track surface, and the emitted infrared or laser is used to determine whether the equipment at the bottom of the vehicle body has exceeded the limit, so as to quickly know whether the equipment at the bottom of the rail transit vehicle body has exceeded the limit, which saves manpower and material resources as a whole, shortens the working hours of the limit detection of the equipment at the bottom of the vehicle body, facilitates the observation of the staff, avoids the staff working for a long time, ensures the detection accuracy, and avoids the risk of vehicle operation.

[0029] 2) In the present invention, the track is supported by multiple support piers, and the distance between two adjacent support piers is convenient for workers to enter. The width of the support pier is greater than that of the track, so that the second detection component can be easily fixed on the outer side of the support pier.

[0030] 3) The second detection component in the present invention has a reasonable structure. The second detection component can emit infrared rays or lasers. The infrared rays or lasers emitted by the second detection component are flush with the track surface. When the limit detection component also emits infrared rays or lasers for limit, the two infrared rays or two lasers intersect in space. The distance between the two infrared rays or two lasers is measured by a measuring ruler, which is conducive to quickly determining the height of the infrared rays emitted by the first infrared level meter or the first laser emitter from the track surface.

[0031] 4) The structure of the limit detection component in the present invention is reasonably set, the mounting seat is provided with a mounting groove, the bottom side of the first infrared level or the first laser emitter is inserted into the mounting groove, and the first fastener is set to achieve a stable connection between the first infrared level or the first laser emitter and the mounting seat.

[0032] 5) In the present invention, a level is fixed on the top side of the first infrared level or the first laser emitter, and the level of the first infrared level or the first laser emitter can be determined by the level to ensure the level of the emitted infrared or laser and the accuracy of the detection result.

[0033] 6) The method provided in the present invention solves the problem of unlimited limit devices at the bottom of the vehicle body. The rail transit vehicle body is elevated so that the first infrared level or the first laser transmitter emits infrared rays or lasers at a set height higher than the track surface. The staff can quickly observe whether the equipment at the bottom of the vehicle body exceeds the limit. If the equipment at the bottom of the vehicle body exceeds the limit, a mark can be made to readjust the installation of the equipment at the bottom of the vehicle body, effectively improving the efficiency and accuracy of the limit detection of the equipment at the bottom of the vehicle body. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0035] Figure 1 It is a schematic diagram of a track being supported in a device for detecting the limit of equipment under a rail transit vehicle body according to one or more embodiments of the present invention.

[0036] Figure 2 It is a schematic diagram of a clearance detection component in a device for detecting the clearance of equipment at the bottom of a rail transit vehicle body according to one or more embodiments of the present invention.

[0037] Figure 3 It is a schematic diagram of a second detection component installed on a supporting pier in a device for detecting the limit of equipment at the bottom of a rail transit vehicle body according to one or more embodiments of the present invention.

[0038] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0039] Wherein: 1. track, 2. support pier, 3. clearance detection component, 4. second detection component;

[0040] 3-1. Support legs, 3-2. Platform, 3-3. Support columns, 3-4. Mounting base, 3-5. Fixing plate, 3-6. First infrared level or first laser transmitter;

[0041] 4-1. A second infrared level or a second laser transmitter, 4-2. A support rod. DETAILED DESCRIPTION

[0042] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0043] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0044] As introduced in the background technology, the prior art has the problems of low efficiency and low precision in detecting the limits of equipment under the rail transit vehicle body. In order to solve the above technical problems, the present invention proposes a device for detecting the limits of equipment under the rail transit vehicle body.

[0045] Embodiment 1

[0046] In a typical embodiment of the present invention, reference is made to Figure 1 As shown, a device for detecting the limit of equipment at the bottom of a rail transit vehicle body comprises a plurality of rails 1, along which the rail transit vehicle body can pass, the rails are erected at a high place, a first space is arranged between two adjacent rails 1, the bottom of the first space is arranged lower than the rail, and a limit detection component 3 is arranged at the bottom of the first space;

[0047] The limit detection component 3 includes a support frame, the height of the support frame is adjustable, the support frame can move along the bottom of the first space, the support frame supports the first infrared level or the first laser emitter 3-6, the infrared light emitted by the first infrared level or the laser emitted by the first laser emitter is parallel to the length direction of the track, and the infrared light emitted by the first infrared level or the laser emitted by the first laser emitter is higher than the set height of the track surface.

[0048] In this embodiment, the device also includes a second detection component 4, which is arranged on the outside of the track 1. The second detection component 4 includes a second infrared level meter or a second laser emitter 4-1. The infrared rays emitted by the second infrared level meter or the laser emitted by the second laser emitter are flush with the track surface, so as to determine the height of the infrared rays emitted by the first infrared level meter or the laser emitted by the first laser emitter through the second detection component.

[0049] It should be noted that each track 1 is supported by multiple support piers 2, and a fixing piece for fixing the track is arranged on the top of each support pier 2, and the fixing piece is a fixing piece used for fixing the track in the prior art. The bottom of the first space can be arranged lower than the bottom of the support pier 2, and the support pier can be a concrete support pier, and the support pier can be arranged higher than the ground, or a groove is dug on the ground, and the width of the groove is greater than the distance between the outer sides of the support piers of the two tracks, and the support pier is arranged in the groove, and the interval between the two adjacent support piers supporting the same track is arranged, and the width of the support pier is greater than the width of the track;

[0050] In this embodiment, the second detection component 4 is fixed to the top or outside of the supporting pier, and the second detection component 4 emits infrared rays or lasers toward the first space. The second detection component 4 emits infrared rays or lasers, and the infrared rays or lasers emitted by the second detection component are flush with the track surface. When the limit detection component also emits infrared rays or lasers for limit, the two infrared rays or two lasers intersect in space. By measuring the distance between the two infrared rays or two lasers with a measuring ruler, the height of the infrared rays emitted by the first infrared level or the first laser emitter from the track surface can be determined.

[0051] Specifically, the second detection component 4 also includes a support rod 4-2 with adjustable height. The support rod with adjustable height can adjust the infrared or laser emitted by the second detection component to be flush with the track surface. The support rod can be an electric telescopic rod or a plurality of support tubes connected in sequence. Two adjacent support tubes can be abutted or fixedly connected by bolts. The support rod can be directly fixed to the top of a support pier, or, refer to Figure 3 As shown, the support rod 4-2 is fixed to the outside of the support pier 2. When the support rod 4-2 is fixed to the outside of the support pier, the support rod is L-shaped, and the top of the support rod supports the second infrared level or the second laser emitter 4-1.

[0052] It is easy to understand that the second detection component can be installed on the side of the first carriage of the rail transit vehicle body, and the infrared ray or laser emitted by the second detection component is arranged perpendicular to the infrared ray or laser emitted by the limit detection component.

[0053] In other examples, the second detection component can be arranged at intervals between support piers. In this way, the second detection component is arranged in multiple locations, and there is no need to disassemble the second detection component, and there is no need to adjust the second detection component too many times to ensure the height of the infrared or laser it emits, which is conducive to quickly judging whether the equipment at the bottom of the vehicle body is out of bounds; or, the support rod of the second detection component is detachable relative to the support pier, and a mounting plate is arranged at the end of the support rod, and bolts pass through the mounting plate to be fixed to the support pier.

[0054] In this embodiment, a guide rail is provided at the bottom of the first space, two guide rails may be provided, the guide rail may be a U-shaped guide rail, the U-shaped guide rail may be fixed to the ground, the guide rail and the track are parallel to each other, and a guide wheel is provided at the bottom of the support frame, that is, the bottom of the support leg, and the guide wheel may move along the guide rail;

[0055] The guide wheel is a lockable wheel, which moves along the guide rail. A limit plate is arranged at the end of the guide rail. After the limit detection component reaches the set position, the lockable wheel can be locked to prevent the limit detection component from moving during the detection process, thereby ensuring the accuracy of the detection.

[0056] refer to Figure 2As shown, the support frame includes a platform 3-2, a plurality of support legs 3-1 are arranged on the bottom side of the platform, two support legs on the same side move along the same guide rail, a support column 3-3 with adjustable height is arranged on the top side of the platform, a mounting seat 3-4 is arranged on the top of the support column, and the mounting seat is connected to the first infrared level or the first laser emitter 3-6.

[0057] The mounting seat 3-4 is provided with a mounting groove, and the mounting seat is provided with mounting holes on both sides of the mounting groove, and the bottom side of the first infrared level meter or the first laser emitter is inserted into the mounting groove, and the shape of the mounting groove is adapted to the shape of the bottom side of the first infrared level meter or the first laser emitter;

[0058] In addition, a fixing plate 3-5 is provided on the side of the first infrared level or the first laser emitter, and an opening is provided on the fixing plate 3-5. A first fastener such as a bolt passes through the opening of the fixing plate and the mounting hole and is then locked by a nut, thereby realizing a stable connection between the first infrared level or the first laser emitter and the mounting seat.

[0059] It is easy to understand that a level is fixed on the top side of the first infrared level or the first laser emitter, and the level of the first infrared level or the first laser emitter can be determined by the level to ensure the level of the emitted infrared or laser. Specifically, the level can be a bubble level, or in other examples, the level uses an inclination sensor, and the inclination sensor is connected to the controller. The controller can select a PLC controller or other types of controllers, and the controller is fixed to the side of the platform.

[0060] In some examples, the support column is an electric telescopic rod, a fixed end of the electric telescopic rod is connected to the platform, and a movable end of the electric telescopic rod is connected to the mounting base;

[0061] Alternatively, in some other examples, the support column includes a plurality of support tubes which are sequentially mounted, and two adjacent sections of the support tubes are abutted or fastened together by a second fastener such as a bolt.

[0062] In the device provided in this embodiment, a track is erected, and the rail transit vehicle body can move along the track. A first space is set between two adjacent tracks, and the bottom of the first space is lower than the track setting. In this way, a limit detection component can be set in the first space, and the limit detection component includes a first infrared level meter or a first laser emitter. The infrared or laser emitted by the limit detection component is higher than the track surface. The emitted infrared or laser is used to determine whether the equipment at the bottom of the vehicle body has exceeded the limit, so that it is possible to quickly know whether the equipment at the bottom of the rail transit vehicle body has exceeded the limit, which saves manpower and material resources as a whole, shortens the working hours of the limit detection of the equipment at the bottom of the vehicle body, avoids long working hours for personnel, ensures detection accuracy, and avoids vehicle operation risks.

[0063] Embodiment 2

[0064] This embodiment provides a method for detecting the clearance of equipment at the bottom of a rail transit vehicle body, using the device for detecting the clearance of equipment at the bottom of a rail transit vehicle body described in Embodiment 1, and includes the following contents:

[0065] Move the rail transit vehicle body whose bottom equipment limit is to be tested to the track;

[0066] A clearance detection component is arranged between two adjacent tracks, the clearance detection component is placed under a carriage, and a first infrared level meter or a first laser transmitter is arranged on the clearance detection component, and the infrared rays emitted by the first infrared level meter or the laser emitted by the first laser transmitter are along the length direction of the track;

[0067] By adjusting the height of the support frame, the infrared light emitted by the first infrared level meter or the laser light emitted by the first laser emitter is higher than the track surface by a set height, for example, the bogie area at the bottom of the vehicle body is set to be 80 mm higher than the track surface;

[0068] The staff standing behind the clearance detection component can quickly determine the clearance situation of the equipment at the bottom of the rail transit vehicle body through infrared or laser;

[0069] The rail transit vehicle body or the mobile clearance detection component is moved along the track so that the clearance detection component is placed under the next carriage to continue the judgment.

[0070] In addition, a second detection component is arranged on the top or outside of some supporting piers, and the second detection component includes a second infrared level meter or a second laser emitter. The infrared rays emitted by the second infrared level meter or the laser emitted by the second laser emitter are arranged along the width direction of the track and flush with the track surface. The two infrared rays or the two lasers are perpendicular to each other. The distance between the two infrared rays or the two lasers can be quickly determined by a measuring ruler, so as to determine the height of the infrared rays emitted by the first infrared level meter or the laser emitted by the first laser emitter through the second detection component.

[0071] As the limit detection component moves, the second detection component can be moved, or a second detection component is installed at every set number of support piers to facilitate quick determination of the height (higher than the height of the track surface) of the infrared light emitted by the first infrared level meter or the laser emitted by the first laser transmitter.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for detecting the limit of equipment at the bottom of a rail transit vehicle body, characterized in that: The invention comprises a plurality of tracks, along which a rail transit vehicle body can pass, the tracks are erected at a high place, a first space is arranged between two adjacent tracks, the bottom of the first space is arranged lower than the track, and a clearance detection component is arranged at the bottom of the first space; The limit detection component includes a support frame, the height of the support frame is adjustable, the support frame can move along the bottom of the first space, the support frame supports a first infrared level or a first laser emitter, the infrared rays emitted by the first infrared level or the laser emitted by the first laser emitter are parallel to the length direction of the track, and the infrared rays emitted by the first infrared level or the laser emitted by the first laser emitter are higher than a set height than the track surface.

2. The device for detecting the limit of equipment under the rail transit vehicle body according to claim 1, characterized in that: It also includes a second detection component, which is arranged on the outside of the track. The second detection component includes a second infrared level meter or a second laser emitter. The infrared light emitted by the second infrared level meter or the laser emitted by the second laser emitter is flush with the track surface, so as to determine the height of the infrared light emitted by the first infrared level meter or the laser emitted by the first laser emitter through the second detection component.

3. The device for detecting the limit of equipment under the rail transit vehicle body according to claim 2, characterized in that: Each of the tracks is supported by a plurality of support piers, and the distance between two adjacent support piers supporting the same track is set, and the width of the support pier is greater than the width of the track; The second detection component is fixed on the top or outside of the supporting pier, and the second detection component emits infrared rays or lasers toward the first space.

4. The device for detecting the limit of equipment under the rail transit vehicle body according to claim 2, characterized in that: The second detection component also includes a support rod with adjustable height, and the top of the support rod supports the second infrared level meter or the second laser transmitter.

5. The device for detecting the limit of equipment under the rail transit vehicle body according to claim 1, characterized in that: A guide rail is provided at the bottom of the first space, the guide rail and the track are parallel to each other, and a guide wheel is provided at the bottom of the support frame, and the guide wheel can move along the guide rail; The guide wheel is a lockable wheel.

6. The device for detecting the limit of equipment under a rail transit vehicle body according to claim 1, characterized in that: The support frame includes a platform, a plurality of support legs are arranged on the bottom side of the platform, a support column with adjustable height is arranged on the top side of the platform, a mounting seat is arranged on the top of the support column, and the mounting seat is connected to the first infrared level meter or the first laser emitter.

7. The device for detecting the limit of equipment under the rail transit vehicle body according to claim 6, characterized in that: The mounting seat is provided with a mounting groove, and the mounting seat is provided with mounting holes on both sides of the mounting groove, and the bottom side of the first infrared level meter or the first laser transmitter is inserted into the mounting groove; A fixing plate is arranged on the side of the first infrared level meter or the first laser transmitter, an opening is arranged on the fixing plate, and a first fastener is arranged through the fixing plate opening and the mounting hole.

8. The device for detecting the limit of equipment under a rail transit vehicle body according to claim 6, characterized in that: A level is fixed on the top side of the first infrared level or the first laser transmitter.

9. The device for detecting the limit of equipment under a rail transit vehicle body according to claim 6, characterized in that: The support column is an electric telescopic rod, the fixed end of the electric telescopic rod is connected to the platform, and the movable end of the electric telescopic rod is connected to the mounting seat; Alternatively, the support column includes a plurality of support tubes which are sequentially mounted, and two adjacent sections of the support tubes are connected by a second fastener.

10. A method for detecting the clearance of equipment at the bottom of a rail transit vehicle body, characterized in that: A device for detecting the limit of equipment at the bottom of a rail transit vehicle body according to any one of claims 1 to 9, comprising the following contents: Move the rail transit vehicle body whose bottom equipment limit is to be tested to the track; A clearance detection component is arranged between two adjacent tracks, the clearance detection component is placed under a carriage, and a first infrared level meter or a first laser transmitter is arranged on the clearance detection component, and the infrared rays emitted by the first infrared level meter or the laser emitted by the first laser transmitter are along the length direction of the track; By adjusting the height of the support frame, the infrared light emitted by the first infrared level meter or the laser light emitted by the first laser transmitter is higher than the track surface by a set height; The staff standing behind the clearance detection component can quickly determine the clearance status of the equipment at the bottom of the rail transit vehicle body through infrared or laser; The rail transit vehicle body or the mobile clearance detection component is moved along the track so that the clearance detection component is placed under the next carriage to continue the judgment.

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