Rail distance measuring device for rail transit

Abstract

The invention relates to the technical field of track spacing measurement, in particular to a track spacing measuring device for track traffic, which comprises a measuring rod body and at least two groups of track clamping pieces, each group of clamping pieces comprises at least two unit clamping mechanisms, and each mechanism consists of an elastic telescopic piece, a sliding chute, a clamp and a sliding block. The elastic telescopic piece is embedded into a sliding groove extending in the length direction of the rod body, one end of the elastic telescopic piece abuts against the end, away from the rail, in the sliding groove, and the other end of the elastic telescopic piece pushes the sliding block to move. The sliding block is in linkage connection with the clamp, and clamping force enabling the clamp to be tightly attached to the side face of the rail is continuously generated under the action of the elastic telescopic piece. According to the invention, the measuring device can automatically clamp the track during measurement, so that the measurement precision is prevented from being influenced by factors such as installation deviation and local deformation of the track, and the detection efficiency and reliability are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of track spacing measurement, and in particular to a track spacing measurement device for rail transportation. Background Art

[0002] As rail transit evolves toward higher speeds and intelligent systems, higher requirements are placed on the accuracy and efficiency of measuring track geometry. However, traditional track spacing measurement devices generally utilize mechanical clamping, requiring manual adjustment and tightening of the fixture for each measurement. This is not only cumbersome and time-consuming, but also affects measurement accuracy due to factors such as installation deviations and local track deformation. Therefore, a track spacing measurement device capable of adaptively clamping the track is urgently needed to improve detection efficiency and reliability. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a track spacing measuring device for rail transit, which can automatically clamp the track during measurement to avoid the measurement accuracy being affected by installation deviations and local deformation of the track, thereby improving detection efficiency and reliability.

[0004] The purpose of the present invention is achieved by adopting the following technical solutions:

[0005] A track spacing measuring device for rail transportation, comprising:

[0006] Measuring rod;

[0007] At least two groups of rail clamps, the two groups of rail clamps are respectively installed at the two ends of the measuring rod body, each of the rail clamps includes at least two unit clamping mechanisms, the unit clamping mechanism includes an elastic telescopic member, a slide groove, a clamp and a slider, the elastic telescopic member is embedded in the slide groove, the slide groove extends along the length direction of the measuring rod body, one end of the elastic telescopic member abuts against the end of the slide groove away from the rail, the other end of the elastic telescopic member abuts against the slider, the slider is linked to the clamp, and the elastic telescopic member has a movement tendency to drive the slider to drive the clamp to approach and stick to the side of the rail.

[0008] Furthermore, the clamp is provided with a first roller, and the first roller is in sliding contact with the side surface of the track.

[0009] Furthermore, the unit clamping mechanism also includes a first limiting slide rail, which extends along the sliding direction of the slider. The clamp is provided with a second roller, and the first limiting slide rail and the second roller are movably cooperated to limit the swing of the clamp in the vertical direction.

[0010] Furthermore, the measuring rod body is pivotally connected to a plurality of third rollers, and at least one third roller is provided between the two unit clamping mechanisms of the track clamping member. The third roller is used to roll in the extension direction of the rail wheel tread and support the measuring rod body.

[0011] Furthermore, each of the unit clamping mechanisms is equipped with a second limit slide rail, which extends along the length direction of the measuring rod body; a limit block is connected to the slider, and the limit block slides in cooperation with the second limit slide rail; a plurality of plug-in holes distributed in sequence are provided on the slide rail path of the second limit slide rail, and at least one of the plug-in holes is detachably connected to a limit pin, which is inserted into the second limit slide rail, and the limit pin is used to prevent the limit block from sliding in the direction away from the rail.

[0012] Furthermore, the measuring rod body includes two unit measuring rods and a gear column. A gear bar is provided at one end of the unit measuring rod away from the unit clamping mechanism, and the gear bars of the two unit measuring rods are both transmission-connected to the gear column.

[0013] Furthermore, one end of the unit measuring rod away from the unit clamping mechanism is connected to a scale guide rail, and the connection between the two unit measuring rods is covered by the scale guide rail so that the two unit measuring rods are in the same straight line.

[0014] Furthermore, the scale guide rail is provided with screws and is detachably connected to the corresponding unit measuring rod via the screws.

[0015] Furthermore, a container is movably connected to the top of the tooth column, and the container is used to accommodate the marking dye.

[0016] Furthermore, the container is hinged with a push rod.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The two-unit clamping mechanism contained in the track clamp can simultaneously apply clamping force at different positions on the side of the rail, avoiding shaking of the measuring rod caused by uneven force at a single point and improving measurement accuracy. When the measuring rod is subjected to lateral forces (such as wind or vibration), the dual clamping mechanism can provide symmetrical clamping force to prevent the device from shifting or loosening, ensuring the stability of the measurement process.

[0019] 2. The two clamping units can be adjusted independently to adapt to slight unevenness or wear on the side of the rail, ensuring a close fit between the clamp and the rail surface and reducing measurement errors. The two clamping units can be adjusted independently to accommodate rails of different widths, enhancing the versatility of the device.

[0020] 3. One end of the elastic telescopic part abuts against the end of the slide away from the rail, and the other end abuts against the slider. Even if the rail is worn or installed incorrectly, the elastic telescopic part can still automatically adjust to compensate for the gap and ensure stable clamping. This also simplifies operation, eliminating the need to manually adjust the position of the fixture. The preload force of the elastic telescopic part automatically adapts to different rail types, reducing manual intervention and improving measurement efficiency. The elastic telescopic part always provides a unidirectional clamping force, allowing the slider to drive the fixture to stably fit the rail, preventing displacement of the measuring device due to external forces. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a track spacing measuring device for rail transit according to the present invention;

[0022] Figure 2 A top view of a track spacing measuring device for rail transit according to the present invention;

[0023] Figure 3 for Figure 2 A is a partial enlargement shown.

[0024] In the figure: 1. Measuring rod body; 101. Unit measuring rod; 102. Gear column; 111. Gear bar; 2. Track clamping member; 201. Unit clamping mechanism; 211. Elastic telescopic member; 212. Slide groove; 213. Clamp; 214. Slider; 215. First limit slide rail; 3. Rail; 4. First roller; 5. Second roller; 6. Third roller; 7. Second limit slide rail; 8. Limit block; 9. Connecting hole; 10. Scale guide rail; 11. Screw; 12. Container; 13. Push rod. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element, or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element, or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] See also Figure 1-Figure 3 A track spacing measuring device for rail transit in a preferred embodiment of the present invention includes a measuring rod body 1 and at least a Liang Zhu track clamping member 2, two groups of the track clamping members 2 are respectively installed at both ends of the measuring rod body 1, each of the track clamping members 2 includes at least two unit clamping mechanisms 201, the unit clamping mechanism 201 includes an elastic telescopic member 211, a slide groove 212, a clamp 213 and a slider 214, the elastic telescopic member 211 is embedded in the slide groove 212, the slide groove 212 extends along the length direction of the measuring rod body 1, one end of the elastic telescopic member 211 abuts against the end of the slide groove 212 away from the rail 3, and the other end of the elastic telescopic member 211 abuts against the slider 214, the slider 214 is linked to the clamp 213, and the elastic telescopic member 211 has a movement tendency to drive the slider 214 to drive the clamp 213 to approach and cling to the side of the rail 3.

[0029] The working process of the present invention is as follows: the measuring rod body 1 is placed across the rail 3, so that the two groups of rail clamping parts 2 are respectively aligned with the rails 3 on both sides, and the slider 214 is pushed to move along the slide groove 212 under the action of external force, compressing the elastic telescopic part 211, so that the two unit clamping mechanisms 201 are on both sides of the rail 3. After releasing the slider 214, the rebound force of the elastic telescopic part 211 pushes the slider 214, so that the clamp 213 continues to be close to the side of the rail 3. After stable clamping is achieved, the track spacing is read through the measuring rod body 1.

[0030] Obviously, based on the two unit clamping mechanisms 201 included in the track clamping member 2, clamping force can be applied at different positions on the side of the rail 3 at the same time, avoiding the shaking of the measuring rod 1 caused by uneven force at a single point, thereby improving the measurement accuracy; when the measuring rod 1 is subjected to lateral force (such as wind force or vibration), the double clamping mechanism can provide symmetrical clamping force to prevent the device from shifting or loosening, thereby ensuring the stability of the measurement process.

[0031] The two unit clamping mechanisms 201 can be adjusted independently to adapt to slight unevenness or wear on the side of the rail 3, ensuring that the clamp 213 fits tightly against the rail surface and reducing measurement errors. The two unit clamping mechanisms 201 can be adjusted independently to adapt to rails 3 of different widths, enhancing the versatility of the device.

[0032] Because one end of the elastic telescopic member 211 abuts against the end of the slide groove 212 away from the rail 3, and the other end of the elastic telescopic member 211 abuts against the slider 214, even if the rail 3 is worn or installed with errors, the elastic telescopic member 211 can still automatically adjust the compensation gap to ensure stable clamping; it also simplifies operation and there is no need to manually adjust the position of the clamp 213. The pre-tightening force of the elastic telescopic member 211 automatically adapts to different rail types, reducing manual intervention and improving measurement efficiency; the elastic telescopic member 211 always provides a unidirectional pressing force, so that the slider 214 drives the clamp 213 to stably fit the rail 3, preventing the displacement of the measuring device due to external force.

[0033] In the present invention, the elastic telescopic member 211 is embedded in the slide groove 212. This structure makes the overall device more compact. The compression direction of the elastic telescopic member 211 is ensured by the guiding effect of the slide groove 212, and the slider 214 is always subjected to the force in the same direction. The semi-closed slide groove 212 structure effectively reduces the intrusion of pollutants such as dust and rainwater, and improves the service life of the elastic telescopic member 211 and the slider 214. At the same time, it is also easier to observe the working status of the elastic telescopic member 211 and the slider 214, which is convenient for timely replacement and maintenance, and effectively avoids errors in the measuring device due to damage to parts.

[0034] In the present invention, preferably, the elastic telescopic member 211 adopts a coil spring, which has a simple structure, no complex moving parts, and excellent anti-fatigue properties. It can maintain stable elastic properties for a long time, ensuring that the clamping force is long-lasting and reliable. Compared with other elastic elements, the coil spring has a low manufacturing cost, is easy to mass-produce, and is easy to maintain and replace, which greatly reduces the cost of use. Secondly, the coil spring made of materials such as stainless steel has good corrosion resistance and is suitable for harsh working environments such as outdoor humidity and dust. The two ends of the coil spring can be designed as a flat structure to facilitate stable contact with the slide 212 and the slider 214, ensuring the reliability of force transmission. Among them, the elastic force of the coil spring is linearly related to the compression amount. By optimizing the wire diameter, number of turns and material of the coil spring, its stiffness and preload can be accurately adjusted to meet the requirements of different rail types and measurement accuracy.

[0035] Furthermore, a size scale is provided on the edge of the slide rail. The thickness of the rail 3 can be directly read through the initial value of the scale where the slider 214 is located and the scale value where the slider 214 is located after clamping the rail. This design also simplifies the daily maintenance of the device. The fatigue state of the elastic telescopic part 211 can be judged by comparing the initial scale position, which facilitates timely replacement and maintenance.

[0036] In order to prevent the clamp 213 in contact with the rail 3 from causing wear to the rail 3 during measurement, it is better to cover the part in contact with the rail 3 with an anti-scratch structure, such as adding a rubber pad to evenly distribute the pressure during measurement, and avoid the hard part of the clamp 213 directly scratching the surface of the rail 3, thereby effectively reducing the wear of the rail 3, extending the service life of the rail 3, and reducing maintenance costs; at the same time, the anti-scratch structure can fit the contour of the rail 3 tightly, reduce shaking during measurement, improve the accuracy and reliability of the measurement data, and reduce the noise generated during the measurement process, reducing the impact on the surrounding environment of the railway.

[0037] Preferably, the clamp 213 is provided with a first roller 4, which is in sliding contact with the side of the track. The first roller 4 can convert the sliding friction between the traditional clamp 213 and the rail 3 into rolling friction, greatly reducing the friction force. This not only effectively avoids scratches and wear on the side of the rail 3 due to friction, thereby extending the service life of the rail 3, but also reduces the wear and tear of the clamp 213 itself and reduces maintenance costs. The rolling characteristics of the first roller 4 can enable the clamp 213 to slide smoothly on the side of the rail 3, accurately locate the measurement point, ensure the stability of the measurement process, significantly improve the accuracy and reliability of the measurement data, and improve the efficiency of the measurement operation. The buffering effect of the first roller 4 can also reduce the vibration and noise generated by the measuring equipment during operation, optimize the working environment, and ensure the safety of railway transportation and the smooth progress of the measurement work. Among them, the first roller 4 can be made of a variety of different materials to adapt to different working environments. For example, ceramic rollers, due to their high hardness, corrosion resistance, and high-temperature resistance, are suitable for high-temperature industrial railways such as steel mills and coking plants. They can maintain stable performance at high temperatures to ensure normal measurement. In scenarios such as magnetic levitation train track inspection, which require extremely high cleanliness, they are not easy to absorb dust and impurities, will not contaminate the track surface, and meet the needs of high-precision measurement. Rubber-coated metal-core rollers are suitable for complex outdoor environments, such as mountainous areas and plateau railways. Their rubber outer layer is waterproof and dustproof, can protect the metal core, adapt to slight deformation of the rails, and ensure measurement accuracy. In environments with frequent vibrations, such as railway branch lines or freight railways, the rubber layer can absorb vibration energy, reduce impact on the measuring equipment, extend the equipment life, and improve measurement stability and reliability.

[0038] Preferably, the unit clamping mechanism 201 further includes a first limiting rail 215, which extends along the sliding direction of the slider 214. The clamp 213 is provided with a second roller 5, which flexibly cooperates with the second roller 5 to limit the vertical swing of the clamp 213. The first limiting rail 215 extends along the sliding direction of the slider 214 and flexibly cooperates with the second roller 5 on the clamp 213 to form a precise vertical constraint mechanism, effectively preventing the clamp 213 from swinging due to uneven force, vibration, and other factors during the measurement process. The second pulley provided reduces friction with the first limiting rail 215, limiting the clamp 213 without hindering the clamp 213 from moving away from or toward the rail 3. This limiting structure reduces the stress burden on other components, reduces abnormal friction between the clamp 213 and the rail 3, further extends the service life of the rail 3, the clamp 213, and related components, and reduces equipment maintenance costs.

[0039] To enable continuous measurement on the track and improve measurement efficiency, the measuring rod 1 is preferably pivotally connected to multiple third rollers 6. At least one third roller 6 is positioned between the two clamping mechanisms 201 of the track clamp 2. These third rollers 6 are designed to roll along the tread of the rail 3 and support the measuring rod 1. The third rollers 6 roll along the tread of the rail 3, supporting the measuring rod 1 and enabling smooth sliding movement of the device on the track, achieving continuous and rapid measurement. The rollers share the majority of the rod's weight, significantly reducing operator workload and making it particularly suitable for long-distance track inspections. Their rolling contact significantly reduces friction during measurement, preventing track surface damage that can occur with traditional sliding measurements. The specially designed roller spacing and clamping mechanism create a three-point stable support, ensuring measurement accuracy while also enabling the device to adapt to curved tracks. The rollers utilize a combination of high-precision bearings and wear-resistant rubber rims, ensuring smooth rolling and effectively absorbing vibrations caused by minor track irregularities, guaranteeing stable measurement data. This ensures continuous and efficient measurement.

[0040] In order to promptly detect the sections of rails 3 with abnormal track spacing, preferably, the unit clamping mechanism 201 is equipped with a second limit slide rail 7, which extends along the length direction of the measuring rod body 1; the slider 214 is connected to a limit block 8, and the limit block 8 slides in cooperation with the second limit slide rail 7; the slide rail path of the second limit slide rail 7 is provided with a plurality of plug holes 9 distributed in sequence and at least one of the plug holes 9 is detachably connected to a limit pin, and the limit pin is inserted into the second limit slide rail 7, and the limit pin is used to prevent the limit block 8 from sliding in the direction away from the rail 3. Adjustable limit pins enable quick setting of the standard track gauge safety threshold. When the track spacing increases abnormally, the contact of limit block 8 with the pin triggers mechanical locking, enabling immediate location of the abnormal section. The multi-hole design supports flexible adaptation to different track gauge standards, meeting the differentiated inspection requirements of conventional and high-speed railways. The mechanical limit structure is unaffected by electromagnetic interference and can still operate reliably under complex working conditions. The visual pin design allows operators to intuitively determine track deformation, and with the help of scale markings, millimeter-level precision early warning is achieved. The device automatically remains locked after detecting an anomaly, facilitating subsequent retesting and confirmation, significantly improving the accuracy and traceability of inspection operations. This active mechanical protection mechanism provides dual protection for track safety monitoring.

[0041] Preferably, a container 12 is movably connected to the top of the rack post 102. This container 12 is used to hold marking dye. Container 12 can store liquid or powdered marking dye. When an abnormal track spacing is detected, operators can remove the marking material from container 12 and mark the abnormal section. Once the section is inspected, they can conduct a centralized inspection and repair, improving work efficiency. Container 12 can be connected to a marking tube that extends above the wheel tread of the rail 3. A compression structure is provided on the outside of container 12. By compressing the space within container 12, the marking material is expelled from the marking tube. This allows operators to complete marking without removing the marking material, improving marking efficiency.

[0042] In order to facilitate the rapid and continuous measurement of the measuring device during operation, preferably, the container 12 is hinged with a push rod 13. The push rod 13 allows the operator to easily push the entire measuring device along the track in an upright position, changing the traditional bending and pushing operation method, and greatly reducing labor intensity; the hinged design enables the push rod 13 to be freely adjusted at multiple angles, which can not only adapt to the comfortable operating height of operators of different heights, but also be folded and folded in narrow spaces; it has a handle with an anti-slip texture to ensure stable force during the pushing process; the linkage structure of the push rod 13 and the container 12 allows the marking function to be operated with one hand during the pushing process, realizing a seamless connection between measurement, pushing and marking; the push rod 13 is made of high-strength and lightweight material, which makes the movement of the entire device lighter and more flexible while ensuring structural strength.

[0043] In the present invention, in order to be able to measure more types of tracks, preferably, the measuring rod body 1 includes two unit measuring rods 101 and a toothed column 102. The end of the unit measuring rod 101 away from the unit clamping mechanism 201 is provided with a gear bar 111, and the gear bars 111 of the two unit measuring rods 101 are both in transmission connection with the toothed column 102. This structure constitutes a synchronous rack telescopic structure. By rotating the toothed column 102, the telescopic amount of the unit measuring rods 101 on both sides can be synchronously adjusted to ensure that the track clamping member 2 is always in a symmetrical position and the measurement reference remains absolutely centered. The gear bar 111 transmission has a self-locking characteristic and can fix the telescopic length at any position, which not only ensures measurement rigidity but also adapts to different track gauge requirements. This structure realizes stepless continuous adjustment and can achieve precise adjustment with the help of a precision scale, making it perfectly compatible with existing lines and new track standards.

[0044] To facilitate recording the distance the unit measuring rod 101 is extended and retracted, the end of the unit measuring rod 101 away from the unit clamping mechanism 201 is preferably connected to a graduated guide rail 10. The connection between the two unit measuring rods 101 is enclosed by the graduated guide rail 10, so that the two unit measuring rods 101 are aligned. The graduated guide rail 10 not only provides precise guidance for the extension and retraction of the unit measuring rod 101, but the precision scale engraved on its surface directly displays the extension and retraction distance, enabling real-time visual reading of measurement data. The enclosed structure ensures that the dual-unit measuring rods 101 always maintain an ideal linear motion trajectory, eliminating deflection errors. To accurately read values ​​even during nighttime operations, the scale is preferably equipped with luminous materials to meet measurement requirements under different lighting conditions, further enhancing the practicality of the measuring device.

[0045] Preferably, the graduated guide rail 10 is provided with screws 11, which removably connect it to the corresponding unit measuring rod 101. This screw connection makes installation and removal of the graduated guide rail 10 quick and convenient, facilitating routine maintenance and replacement of worn parts. The adjustable tightening force of the screws 11 ensures a secure connection between the guide rail and the measuring rod while avoiding motion resistance caused by overtightening. The modular design allows for flexible replacement of graduated guide rails 10 with varying accuracy levels based on measurement requirements, meeting diverse operating requirements from routine inspections to precision testing. This structure also facilitates transportation and storage, significantly reducing the size of the device after disassembly, making it particularly suitable for field operations and mobile testing.

[0046] In the description of this specification, the reference terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials, or characteristics described may be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and integrate different embodiments or examples described in this specification, as well as features of different embodiments or examples, unless they are mutually inconsistent.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0048] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily conceive of various modifications or substitutions within the technical scope disclosed in this application, and such modifications or substitutions should be included within the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A track spacing measuring device for rail transportation, characterized in that: include: Measuring rod (1); At least two groups of track clamping members (2), the two groups of track clamping members (2) are respectively installed at the two ends of the measuring rod body (1), each of the track clamping members (2) includes at least two unit clamping mechanisms (201), the unit clamping mechanisms (201) include an elastic telescopic member (211), a slide groove (212), a clamp (213) and a slider (214), the elastic telescopic member (211) is embedded in the slide groove (212), and the slide groove (212) is moved along the The measuring rod (1) extends in the longitudinal direction, one end of the elastic telescopic member (211) abuts against the end of the slide groove (212) away from the rail (3), and the other end of the elastic telescopic member (211) abuts against the slider (214). The slider (214) is linked to the clamp (213), and the elastic telescopic member (211) has a movement tendency of driving the slider (214) to drive the clamp (213) to approach and closely adhere to the side of the rail (3).

2. A track spacing measuring device for rail transportation according to claim 1, characterized in that: The clamp (213) is provided with a first roller (4), and the first roller (4) is in sliding contact with the side surface of the track.

3. The track spacing measuring device for rail transportation according to claim 1, characterized in that: The unit clamping mechanism (201) further includes a first limiting slide rail (215), the first limiting slide rail (215) extending along the sliding direction of the slider (214), the clamp (213) being provided with a second roller (5), the first limiting slide rail (215) movably cooperating with the second roller (5) to limit the swing of the clamp (213) in the vertical direction.

4. The track spacing measuring device for rail transportation according to claim 1, characterized in that: The measuring rod body (1) is pivotally connected to a plurality of third rollers (6), and at least one third roller (6) is provided between the two unit clamping mechanisms (201) of the track clamping member (2). The third roller (6) is used to roll in the extension direction of the wheel tread of the rail (3) and support the measuring rod body (1).

5. The track spacing measuring device for rail transportation according to claim 1, characterized in that: Each of the unit clamping mechanisms (201) is provided with a second limiting slide rail (7), which extends along the length direction of the measuring rod body (1); a limiting block (8) is connected to the slider (214), and the limiting block (8) is slidably matched with the second limiting slide rail (7); a plurality of plug holes (9) distributed in sequence and at intervals are provided on the slide rail path of the second limiting slide rail (7), at least one of the plug holes (9) is detachably plugged with a limiting pin, and the limiting pin is inserted into the second limiting slide rail (7), and the limiting pin is used to prevent the limiting block (8) from sliding in the direction away from the rail (3).

6. The track spacing measuring device for rail transportation according to claim 1, characterized in that: The measuring rod body (1) comprises two unit measuring rods (101) and a gear column (102); a gear bar (111) is provided at one end of the unit measuring rod (101) away from the unit clamping mechanism (201); and the gear bars (111) of the two unit measuring rods (101) are both in transmission connection with the gear column (102).

7. The track spacing measuring device for rail transportation according to claim 6, characterized in that: One end of the unit measuring rod (101) away from the unit clamping mechanism (201) is connected to a scale guide rail (10), and the connection between the two unit measuring rods (101) is covered by the scale guide rail (10) so that the two unit measuring rods (101) are on the same straight line.

8. The track spacing measuring device for rail transportation according to claim 7, characterized in that: The scale guide rail (10) is provided with a screw (11) and is detachably connected to the corresponding unit measuring rod (101) via the screw (11).

9. The track spacing measuring device for rail transportation according to claim 6, characterized in that: The top of the tooth column (102) is movably connected to a container (12), and the container (12) is used to accommodate the marking dye.

10. The track spacing measuring device for rail transportation according to claim 9, characterized in that: The container (12) is hinged with a push rod (13).

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