A length measuring device for rail inspection

Abstract

The utility model relates to rail detection technical field discloses a length measuring device for rail detection, including the main part and the sliding support of setting on the measured rail, the main part includes the casing, motor, drive wheel, rotating rod, transmission mechanism and gyro wheel for automatic progress, the one side of casing is provided with laser measuring instrument, the lower part of main part is provided with the sliding support, and the sliding support one end rotationally connects the guide wheel, and the guide wheel and the rail waist upper portion of measured rail roll contact, the utility model discloses the movable connection design of sliding support makes the device can be according to the shape of rail and carry out the fine adjustment, improved the adaptability, flexibility and stability of device, so that the device not only can carry out the measurement to the straight line length of rail, but also can carry out the measurement to the curve length of rail, and the range of measurement is expanded.

Description

Technical Field

[0001] This utility model relates to the field of rail inspection technology, and in particular to a length measuring device for rail inspection. Background Technology

[0002] In the process of railway construction and maintenance, measuring the length of rails is a crucial step in ensuring the safe operation of railways. The length of rails not only directly affects the accuracy of railway track laying but also relates to the smoothness and safety of train operation. Therefore, accurate and efficient measurement of rail length is of paramount importance for railway construction, maintenance, and operation.

[0003] A search revealed Chinese Patent Publication (Announcement) No. CN119568225A, which discloses a length measuring device for rail inspection. The device includes a rail, with a locking assembly slidably mounted on the outer surface of the rail, fixing it to the outer surface via the locking assembly. When the adjusting plate rotates, it drives a movable block to move away from the support plate, which in turn drives a moving rod located at the upper end of the movable block to move synchronously. A pressing block is provided at the end of the moving rod, which fixes the rail in place.

[0004] Although the aforementioned patent can measure the length of the rail, its support plate and pressing block structure for the rollers are complex. This not only increases the manufacturing cost of the device, but also makes maintenance and repair more difficult. The complex structure also reduces the flexibility of the device and makes it prone to failure. Utility Model Content

[0005] To address existing problems, this utility model provides a length measuring device for rail inspection. Through the arrangement of a motor, transmission mechanism, drive wheel, and guide wheel, the drive wheel enables the device to move smoothly along the rail, reducing the labor intensity of manual operation and improving measurement efficiency. The movable connection design of the sliding bracket allows the device to be finely adjusted according to the shape of the rail, improving its adaptability, flexibility, and stability. This allows the device to measure not only the straight length of the rail but also the curved length, expanding the measurement range.

[0006] To achieve the above objectives, the present invention provides the following technical solution.

[0007] A length measuring device for rail inspection includes a main body and a sliding support mounted on the rail being measured. The main body includes a housing, a motor, a drive wheel, a rotating rod, a transmission mechanism, and rollers for automatic movement. A laser measuring instrument is mounted on one side of the housing. A sliding support is mounted on the lower part of the main body, with one end of the sliding support rotatably connected to a guide wheel, which makes rolling contact with the upper part of the web of the rail being measured.

[0008] As a further improvement of this utility model, the sliding bracket also includes a guide rod, which passes through the sliding bracket and is slidably connected at both ends to the sliding grooves provided on both sides of the bottom of the housing. A tensile spring is sleeved on the outer surface of the guide rod, and the two ends of the tensile spring are fixedly connected to the sliding bracket.

[0009] As a further improvement of this utility model, a motor is fixedly connected inside the housing, a rotating rod is connected to the output end of the motor, a transmission mechanism is provided on the outer surface of the rotating rod, a drive wheel is connected to the other side of the transmission mechanism, and a roller is rotatably connected to the side of the housing away from the drive wheel.

[0010] As a further improvement of this utility model, the transmission mechanism includes a first transmission wheel connected to the outer surface of the rotating rod, the first transmission wheel being rotatably connected to a transmission belt, and a second transmission wheel connected to the other side of the transmission belt, the second transmission wheel being connected to a drive wheel.

[0011] As a further improvement of this utility model, an adjusting rod is threadedly connected to the outer surface of the housing near the laser measuring instrument, and a clamping plate is rotatably connected to one end of the adjusting rod.

[0012] As a further improvement of this utility model, a first rubber pad is fixedly connected to the inner side of the clamping plate, and a second rubber pad is fixedly connected to the side of the housing near the laser measuring instrument.

[0013] As a further improvement of this utility model, a cylindrical base is fixedly connected to the outer surface of the housing, and a universal joint is rotatably connected to the inner side of the cylindrical base.

[0014] As a further improvement of this utility model, a threaded sleeve is fixedly connected to the outer surface of the universal head, a sleeve rod is threadedly connected to the inside of the threaded sleeve, and an extension rod is slidably connected to the inside of the sleeve rod.

[0015] As a further improvement of this utility model, a spring sheet is fixedly connected to the inner side of the extension rod, and a limiting post is fixedly connected to both sides of the outer surface of the spring sheet. A limiting hole is opened on both sides of the outer surface of the sleeve rod, and the limiting post and the limiting hole are engaged.

[0016] As a further improvement of this utility model, the sliding bracket consists of two opposing parts, each of which is L-shaped.

[0017] This utility model has the following beneficial effects: By incorporating a motor, transmission mechanism, drive wheel, and guide wheel, the motor drives the transmission mechanism via a rotating rod, enabling the drive wheel to move the device smoothly along the rail. This reduces the labor intensity of manual operation and improves measurement efficiency. The rollers assist the device's movement along the rail, reducing the burden on the drive wheel and making the device's movement on the rail smoother and more stable. The movable connection design of the support allows the device to be finely adjusted according to the shape of the rail, improving its adaptability, flexibility, and stability. This ensures the stability and directionality of the device on the rail, enabling it to measure not only the straight length of the rail but also the curved length, thus expanding the measurement range.

[0018] Preferably, the sliding support moves more smoothly by using a guide rod and a sliding groove, along with a tension spring, which enhances the overall stability of the measuring device, ensures accurate positioning of the laser measuring instrument, and improves measurement accuracy.

[0019] Preferably, the internal power transmission structure uses a motor to drive a rotating rod, which in turn drives a drive wheel via a transmission mechanism. This, along with rollers, enables the measuring device to move stably on the rails, ensuring the continuity and smoothness of the measurement process.

[0020] Preferably, power is transmitted using a transmission wheel and a transmission belt, which has a simple and reliable structure, can smoothly transmit the motor power to the drive wheel, reduce power transmission loss, and improve the operating efficiency of the device.

[0021] Preferably, the adjusting rod cooperates with the clamping plate to adjust the position of the clamping plate, which facilitates adjusting the clamping and fixing degree of the laser measuring instrument according to different specifications of rails or measurement needs, thereby enhancing the applicability and flexibility of the device.

[0022] Preferably, the rubber pad acts as a buffer and anti-slip agent, reducing vibration and friction between the measuring device and the rail, protecting the surface of the rail and the device, while improving the stability of the device on the rail and ensuring measurement accuracy.

[0023] Preferably, the combination of the cylinder base and the universal joint allows the connecting parts (sleeve rods) to rotate at multiple angles, facilitating the adjustment of the orientation of relevant components of the measuring device and meeting different measurement angle and position requirements.

[0024] Preferably, the sleeve is threadedly connected to the sleeve rod, which allows for adjustment of the sleeve rod's extension length. The extension rod slides within the sleeve rod, further expanding the length adjustment range and enabling the measuring device to adapt to different length measurement needs, thus enhancing its versatility and ease of manual advancement.

[0025] Preferably, the spring, the limiting post, and the limiting hole constitute a limiting structure. When the extension rod slides to the appropriate position, the limiting post engages with the limiting hole to fix the position of the extension rod, preventing it from sliding arbitrarily, ensuring structural stability during measurement, and improving measurement reliability.

[0026] Preferably, the L-shaped sliding bracket structure, while meeting the requirements for rotational connection with the guide wheel and movable connection with other main components, optimizes the spatial layout, making the device structure more compact and facilitating installation and use on the rail. Attached Figure Description

[0027] The accompanying drawings described herein are for illustrative purposes only and do not limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. In the drawings: Figure 1 This is a schematic diagram of the main structure of Embodiment 1 of this utility model; Figure 2 This is a side view of Embodiment 1 of the present invention. Figure 3 This is a schematic diagram of the internal structure of the shell in Embodiment 1 of this utility model; Figure 4 This is a schematic diagram of the sliding bracket structure of Embodiment 1 of this utility model; Figure 5 This is a schematic diagram of the sleeve structure of Embodiment 1 of this utility model; Figure 6 This is a schematic diagram of the main structure of Embodiment 2 of this utility model; Figure 7 This is a side view of Embodiment 2 of the present invention. Figure 8 This is a schematic diagram of the sliding bracket structure of Embodiment 2 of this utility model.

[0028] In the diagram: 1. Rail; 2. Main body; 3. Shell; 4. Motor; 5. Rotating rod; 6. Transmission mechanism; 601. First transmission wheel; 602. Transmission belt; 603. Second transmission wheel; 7. Drive wheel; 8. Roller; 9. Sliding bracket; 10. Guide wheel; 11. Laser measuring instrument; 12. Adjusting rod; 13. Clamping plate; 14. First rubber pad; 15. Second rubber pad; 16. Guide rod; 17. Tensile spring; 18. Cylinder seat; 19. Universal head; 20. Screw sleeve; 21. Sleeve rod; 22. Extension rod; 23. Spring piece; 24. Limiting post; 25. Limiting hole. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0030] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0031] Unless otherwise defined below, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] Example 1 like Figure 1 As shown, a length measuring device for rail inspection includes a main body and a sliding support mounted on the rail being measured. The main body comprises a housing, a motor, a drive wheel, a rotating rod, a transmission mechanism, and rollers for automatic movement. A laser measuring instrument is mounted on one side of the housing. The sliding support is located at the lower part of the main body, with a guide wheel rotatably connected to one end. The guide wheel makes rolling contact with the upper part of the web of the rail being measured. A motor is fixedly connected inside the housing, and the output end of the motor is connected to the rotating rod. A transmission mechanism is mounted on the outer surface of the rotating rod, and the other side of the transmission mechanism is connected to the drive wheel. A roller is rotatably connected to the side of the housing away from the drive wheel.

[0033] Specifically, such as Figure 1-3As shown, a motor 4 is fixedly connected to one side of the housing 3, a rotating rod 5 is fixedly connected to the output end of the motor 4, a transmission mechanism 6 is installed on the outer surface of the rotating rod 5, a drive wheel 7 is fixedly connected to the bottom of the outer surface of the transmission mechanism 6, a roller 8 is rotatably connected to the inner side of the main body 2 away from the drive wheel 7, brackets 9 are movably connected to both sides of the inner side of the main body 2, guide wheels 10 are rotatably connected to the brackets 9, the guide wheels 10 are in rolling connection with the rail 1, and a laser measuring instrument 11 is installed on one side of the outer surface of the housing 3.

[0034] In practical use, the device utilizes a motor 4, transmission mechanism 6, drive wheel 7, and guide wheel 10. The rail 1, a crucial component of railway tracks supporting train operation, provides the basic platform for measurement. The main body 2 and housing 3 support and fix the device components. The blank area inside the housing 3 is used to install components such as batteries and controllers, reducing unnecessary mechanical and electronic parts, simplifying the overall structure, lowering manufacturing costs, and reducing the weight and size of the device, making it easier to carry and operate. The motor 4, mounted on the housing 3, drives the transmission mechanism 6 via the rotating rod 5 at the output end, thereby enabling the drive wheel 7 to move the device smoothly on the rail 1, reducing manual labor intensity and improving measurement efficiency. The roller 8 assists the device in moving on the rail 1, reducing the burden on the drive wheel 7 and making the movement of the device on the rail 1 smoother and more stable. The bracket 9 supports the guide wheel 10, and the movable connection design of the bracket 9 allows the device to be adjusted according to... Fine-tuning based on the shape of rail 1 improves the adaptability, flexibility, and stability of the device, ensuring its stability and directionality on rail 1. This allows the device to measure not only the straight length of rail 1 but also the curved length, expanding the measurement range. The laser measuring instrument 11 emits a laser beam onto the surface of rail 1 and then receives the reflected beam, using the time of flight or phase difference of light to calculate the distance, achieving high-precision non-contact measurement and reducing the influence of human factors on the measurement results. At the same time, the laser measuring instrument 11 can record and transmit measurement data in real time, facilitating subsequent data analysis and processing. The detachable nature of the laser measuring instrument 11 reduces maintenance and repair time and costs, improving the continuity and efficiency of measurement work.

[0035] The sliding bracket also includes a guide rod that passes through the sliding bracket and whose two ends are slidably connected to the sliding grooves provided on both sides of the bottom of the housing. A tensile spring is sleeved on the outer surface of the guide rod and the two ends of the tensile spring are fixedly connected to the sliding bracket.

[0036] Specifically, such as Figure 4 As shown, the guide rod 16 is slidably connected to the bracket 9, and a tension spring 17 is sleeved in the middle of the outer surface of the guide rod 16. The tension spring 17 is fixedly connected to the bracket 9.

[0037] In practical use, the guide rod 16 supports and guides the bracket 9, and the tension spring 17 can provide a certain contraction force to keep the guide wheel 10 in stable contact with the surface of the rail 1. Even if there is unevenness on the surface of the rail 1, it can ensure the smooth operation of the device and improve the stability of the measurement.

[0038] The sliding bracket consists of two opposing parts, each of which is L-shaped.

[0039] The transmission mechanism includes a first transmission wheel connected to the outer surface of the rotating rod, the first transmission wheel being rotatably connected to a transmission belt, and a second transmission wheel connected to the other side of the transmission belt, the second transmission wheel being connected to a drive wheel.

[0040] Specifically, such as Figure 3-4 As shown, the transmission mechanism 6 includes a first transmission wheel 601 fixed on the outer surface of the rotating rod 5. A transmission belt 602 is rotatably connected to the inner side of the first transmission wheel 601. A second transmission wheel 603 is connected to the bottom of the inner side of the transmission belt 602. The second transmission wheel 603 is fixedly connected to the drive wheel 7.

[0041] In practical use, the first transmission wheel 601 rotates under the action of the rotating rod 5, and drives the drive wheel 7 to move through the transmission belt 602 and the second transmission wheel 603, ensuring the movement speed and stability of the device on the rail 1 and improving the measurement efficiency.

[0042] An adjusting rod is threadedly connected to the outer surface of the housing near the laser measuring instrument, and a clamping plate is rotatably connected to one end of the adjusting rod.

[0043] Specifically, such as Figure 2-3 As shown, an adjusting rod 12 is threadedly connected to the outer surface of the housing 3 near the laser measuring instrument 11, and a clamping plate 13 is rotatably connected to one end of the adjusting rod 12.

[0044] In practical use, the position of the clamping plate 13 can be easily adjusted by adjusting the adjusting rod 12, thereby achieving a stable installation of the laser measuring instrument 11, making the installation and adjustment of the laser measuring instrument 11 very convenient.

[0045] A first rubber pad is fixedly connected to the inner side of the clamping plate, and a second rubber pad is fixedly connected to the side of the housing near the laser measuring instrument.

[0046] Specifically, such as Figure 3 As shown, a first rubber pad 14 is fixedly connected to the inner side of the clamping plate 13, and a second rubber pad 15 is fixedly connected to the side of the housing 3 near the laser measuring instrument 11.

[0047] In practical use, the first rubber pad 14 effectively prevents the laser measuring instrument 11 from being subjected to hard impacts during installation, protecting the accuracy and service life of the laser measuring instrument 11. The second rubber pad 15 at the bottom provides additional protection, preventing vibrations generated during the movement of the device from damaging the laser measuring instrument 11, thereby extending the service life of the instrument and ensuring measurement accuracy.

[0048] A cylindrical base is fixedly connected to the outer surface of the housing, and a universal joint is rotatably connected to the inner side of the cylindrical base. A threaded sleeve is fixedly connected to the outer surface of the universal joint, and a sleeve rod is threadedly connected to the inside of the threaded sleeve. An extension rod is slidably connected to the inside of the sleeve rod.

[0049] Specifically, such as Figure 2 and 5 As shown, a cylindrical base 18 is fixedly connected to the middle of the outer surface of the housing 3, and a universal joint 19 is rotatably connected to the inner side of the cylindrical base 18.

[0050] In practical use, the universal head 19 is rotatably connected to the inside of the cylinder base 18, allowing the sleeve rod 21 to flexibly adjust the angle, thus improving the applicability of the device.

[0051] A spring sheet is fixedly connected to the inner side of the extension rod, and a limit post is fixedly connected to both sides of the outer surface of the spring sheet. Limit holes are opened on both sides of the outer surface of the sleeve rod, and the limit post and the limit hole are engaged.

[0052] Specifically, such as Figure 5 As shown, a spring piece 23 is fixedly connected to the inner side of the extension rod 22, and a limit post 24 is fixedly connected to both sides of the outer surface of the spring piece 23. Limit holes 25 are opened on both sides of the outer surface of the sleeve rod 21, and the limit post 24 and the limit hole 25 are engaged.

[0053] In practical use, a spring piece 23 and a limiting post 24 are provided on the inner side of the extension rod 22 so that when the extension rod 22 is fully extended, the limiting post 24 can be locked inside the limiting hole 25, which improves the stability of the extension rod 22 and prevents it from sliding accidentally during use.

[0054] Working principle: In use, the motor 4 drives the rotating rod 5, which in turn drives the first transmission wheel 601 in the transmission mechanism 6 to rotate. The power is transmitted to the second transmission wheel 603 via the transmission belt 602, which in turn drives the drive wheel 7 to move smoothly on the rail 1, realizing automatic measurement and reducing the intensity of manual operation. The roller 8 assists in the movement, reducing the burden on the drive wheel 7 and ensuring smooth operation. The guide wheel 10 is connected to the main body 2 through the bracket 9. The movable design of the bracket 9 allows the device to be finely adjusted to adapt to the shape of the rail 1, improving flexibility and stability. The combination of the guide rod 16 and the tension spring 17 provides elastic support for the bracket 9, ensuring that the guide wheel 10 is in close contact with the rail 1, reducing vibration and adapting to uneven tracks. The laser measuring instrument 11 is installed on the outside of the housing 3 and fixed by the adjusting rod 12 and the clamping plate 13. The laser measuring instrument 11 measures the length of the rail 1 in real time and transmits the data, realizing high-precision non-contact measurement and reducing human error. In order to extend the measurement time of the device, the sleeve rod 21 can be installed through the screw sleeve 20, and the extension rod 22 can be unfolded to push the device to move, adapting to different measurement needs and improving practicality.

[0055] Example 2 The difference between this embodiment and Embodiment 1 is that: 1) The sliding brackets are in several pairs.

[0056] like Figure 6-8 As shown, there are two pairs of sliding supports. The number of pairs of sliding supports is adapted to the length of the slide groove, which not only improves the stability of the sliding supports at the curve of the track, but also prevents the guide rod from falling off the slide groove.

[0057] Advantages of this utility model: 1. Through the configuration of a motor, transmission mechanism, drive wheel, and guide wheel, the motor drives the transmission mechanism via a rotating rod, enabling the drive wheel to move the device smoothly on the rail. This reduces the labor intensity of manual operation and improves measurement efficiency. The rollers assist the device in moving on the rail, reducing the burden on the drive wheel and making the movement of the device on the rail smoother and more stable. The movable connection design of the bracket allows the device to be finely adjusted according to the shape of the rail, improving the adaptability, flexibility, and stability of the device. This ensures the stability and directionality of the device on the rail, enabling the device to measure not only the straight length of the rail but also the curved length, thus expanding the measurement range.

[0058] 2. Through the setting of the adjusting rod, clamping plate, tension spring, screw sleeve, and sleeve rod, the adjusting rod can easily adjust the position of the clamping plate, thereby achieving a stable installation of the laser measuring instrument. This makes the installation and adjustment of the laser measuring instrument very convenient. The tension spring can provide a certain contraction force to keep the guide wheel in stable contact with the rail surface. Even when the rail surface is uneven, it can ensure the smooth operation of the device and improve the stability of the measurement. The sleeve rod is easy to install and disassemble through the screw sleeve. When working outdoors, the sleeve rod can be installed, the extension rod can be unfolded, and the device can be pushed, thereby extending the detection time and increasing the practicality of the device.

[0059] The above embodiments are merely one of the implementation methods for achieving the technical solution of this utility model. The scope of protection claimed by this utility model is not limited to this embodiment, but also includes any variations, substitutions, and other implementation methods that are easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A length measuring device for rail inspection, characterized in that, The system includes a main body (2) and a sliding bracket (9) installed on the rail (1) being measured. The main body (2) includes a housing (3), a motor (4), a drive wheel (7), a rotating rod (5), a transmission mechanism (6), and a roller (8) for automatic movement. A laser measuring instrument (11) is installed on one side of the housing (3). A sliding bracket (9) is installed at the lower part of the main body (2). One end of the sliding bracket (9) is rotatably connected to a guide wheel (10), and the guide wheel (10) makes rolling contact with the upper part of the web of the rail (1) being measured.

2. The length measuring device for rail inspection according to claim 1, characterized in that, The sliding bracket (9) also includes a guide rod (16), which passes through the sliding bracket (9) and is slidably connected to the sliding grooves provided on both sides of the bottom of the housing (3). A tensile spring (17) is sleeved on the outer surface of the guide rod (16), and the two ends of the tensile spring (17) are fixedly connected to the sliding bracket (9).

3. The length measuring device for rail inspection according to claim 1, characterized in that, A motor (4) is fixedly connected inside the housing (3). A rotating rod (5) is connected to the output end of the motor (4). A transmission mechanism (6) is provided on the outer surface of the rotating rod (5). A drive wheel (7) is connected to the other side of the transmission mechanism (6). A roller (8) is rotatably connected to the side of the housing (3) away from the drive wheel (7).

4. The length measuring device for rail inspection according to claim 1, characterized in that, The transmission mechanism (6) includes a first transmission wheel (601) connected to the outer surface of the rotating rod (5), the first transmission wheel (601) is rotatably connected to a transmission belt (602), the other side of the transmission belt (602) is connected to a second transmission wheel (603), and the second transmission wheel (603) is connected to the drive wheel (7).

5. The length measuring device for rail inspection according to claim 1, characterized in that, An adjusting rod (12) is threadedly connected to the outer surface of the housing (3) near the laser measuring instrument (11), and a clamping plate (13) is rotatably connected to one end of the adjusting rod (12).

6. The length measuring device for rail inspection according to claim 5, characterized in that, The inner side of the clamp (13) is fixedly connected to a first rubber pad (14), and the side of the housing (3) near the laser measuring instrument (11) is fixedly connected to a second rubber pad (15).

7. The length measuring device for rail inspection according to claim 1, characterized in that, A cylindrical base (18) is fixedly connected to the outer surface of the housing (3), and a universal head (19) is rotatably connected to the inner side of the cylindrical base (18).

8. A length measuring device for rail inspection according to claim 7, characterized in that, The outer surface of the universal head (19) is fixedly connected to a threaded sleeve (20), the inner thread of the threaded sleeve (20) is connected to a sleeve rod (21), and the inner thread of the sleeve rod (21) is slidably connected to an extension rod (22).

9. A length measuring device for rail inspection according to claim 8, characterized in that, The inner side of the extension rod (22) is fixedly connected to a spring piece (23), and both sides of the outer surface of the spring piece (23) are fixedly connected to limit posts (24). Both sides of the outer surface of the sleeve rod (21) are provided with limit holes (25), and the limit posts (24) and limit holes (25) are engaged.

10. A length measuring device for rail inspection according to claim 1, characterized in that, The sliding bracket (9) consists of two opposing parts, each of which is L-shaped.

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