A device for measuring the inner distance of a track wheel pair

Abstract

This utility model discloses a track wheelset inner distance measuring device, belonging to the technical field of track inspection equipment. A right-angled triangle is constructed by connecting the extended end of the telescopic lead assembly to a laser point on the inner surface of the opposite wheel, the distance between the laser emitter's emitting end and the wire hole, and the distance from the laser emitter's emitting end to the opposite wheel. The line connecting the extended end of the telescopic lead assembly to the laser point on the inner surface of the opposite wheel is the length wound inside the storage box plus the sliding distance of the storage box measured by the magnetic grating. The distance from the laser emitter's emitting end to the opposite wheel is then calculated using the Pythagorean theorem, ultimately yielding the distance between the two wheels. This track wheelset inner distance measuring device is small in size, easy to carry, has high measurement accuracy, and is simple to operate, significantly improving the efficiency and reliability of track wheelset inner distance detection.

Description

Technical Field

[0001] This utility model relates to the field of track inspection equipment technology, specifically a track wheelset inner distance measuring device. Background Technology

[0002] Rail locomotives and rolling stock are the core equipment of the railway transportation system, and their operational safety is directly related to the safety of personnel and property. During the long-term, high-load operation of locomotives and rolling stock, the wheelset, as a key component of the running gear, bears the effects of various complex dynamic loads, including uneven impacts from the track, vehicle vibration, load variations, and wheel-rail friction. Under the combined influence of these factors, the inner wheel distance of the wheelset can fluctuate dynamically and even change permanently. The inner wheel distance refers to the minimum distance between the inner working surfaces of the flanges of the left and right wheels of the same wheelset. This parameter is one of the key technical indicators for ensuring good wheel-rail matching and safe and stable vehicle operation. If the inner wheel distance exceeds the specified allowable deviation range, it will lead to abnormal flange wear, deterioration of the wheel-rail fit, and decreased lateral stability of the vehicle. In severe cases, it may cause derailment accidents, resulting in significant losses. Therefore, in the daily operation and maintenance of locomotives and rolling stock, as well as in the quality inspection after wheelset turning, rapid and accurate measurement of the inner wheel distance is of great engineering significance and practical necessity.

[0003] Currently, the rail industry primarily relies on traditional mechanical measuring tools operated manually for measuring wheelset inner distance. Among existing technologies, the most widely used is the vernier caliper measuring device. This type of device typically consists of basic components such as a main scale, vernier, two measuring jaws, a depth rod, and a locking nut. The main scale defines the measurement range, the vernier reads the measurement value, the measuring jaws contact the inner surface of the wheelset being measured, the depth rod limits the vernier's movement, and the locking nut secures the vernier to maintain the reading. During measurement, the operator holds the calipers, placing the fixed and movable measuring jaws against the inner working surfaces of the two wheels of the same wheelset, and visually reads the vernier scale to obtain the inner distance value. Some improved versions also add auxiliary positioning structures to improve measurement stability. In practical applications, wheelset inner distance measuring devices based on the vernier caliper principle have several technical shortcomings, specifically in the following aspects: insufficient measurement accuracy. When actually measuring the inner distance of wheelsets, the actual measurement error often far exceeds the nominal accuracy due to various factors such as parallax in the operator's reading, inconsistent contact angle between the measuring jaws and the inner working surface of the wheel, inaccurate caliper positioning, and poor ambient lighting conditions. The operation is complex and the measurement efficiency is low. In confined working spaces such as under the vehicle or in maintenance pits, operators must complete a series of actions including picking up, placing, positioning, clamping, reading, and recording the calipers, making the process cumbersome. Furthermore, due to the large measuring range and long body of the calipers, it is difficult for a single operator to simultaneously ensure the calipers are level, the measuring jaws are aligned, and the vernier reading is accurate. Usually, two people are needed – one to support the caliper body and the other to read and record the values. The equipment is also large in size, making it inconvenient to carry and store. To accommodate the measurement range of the inner distance of wheelsets of different locomotive models, traditional caliper-type measuring devices are often designed with a long body, resulting in a bulky overall appearance that is inconvenient to store in a tool bag and hinders the flexible movement of maintenance personnel in the limited space under the vehicle.

[0004] In summary, existing wheelset inner distance measuring devices based on the vernier caliper principle suffer from technical problems such as low measurement accuracy, complex operation, low efficiency, large size, and inconvenience in carrying, making it difficult to meet the "fast, accurate, and convenient" requirements of modern rail transit for maintenance and inspection work. Therefore, there is an urgent need in this field for a new type of wheelset inner distance measuring device that is easy to operate, accurate in measurement, compact in structure, and easy to carry. Utility Model Content

[0005] The purpose of this utility model is to address the aforementioned shortcomings by providing a track wheelset inner distance measuring device. This device solves the problems of low measurement accuracy, complex operation, and bulky, inconvenient structure of existing measuring devices. It significantly improves measurement accuracy, simplifies operation, and is easy to carry. To achieve the above objective, this utility model provides the following technical solution:

[0006] A device for measuring the inner distance of a track wheel set includes a telescopic lead assembly, a magnetic grating assembly, and a laser emitter. One end of the telescopic lead assembly is slidably connected to the magnetic grating assembly, and the other end is an extended end. The line connecting the extended end and the emitting end of the laser emitter is parallel to the inner surface of the wheel. During measurement, after the extended end is pulled out and the fixed length of the telescopic lead assembly is used up, the telescopic lead assembly is triggered to slide along the magnetic grating assembly to allow the extended end to continue extending until the extended end reaches the laser point emitted by the laser emitter toward the inner surface of the opposite wheel.

[0007] Furthermore, it also includes a housing; the housing contains a telescopic lead assembly, a magnetic grating assembly, and a laser emitter; on the same side of the housing, there is a wire hole for the extension end of the telescopic lead assembly to extend and a light-transmitting port for the laser emitter to emit laser light.

[0008] Furthermore, the magnetic grating assembly includes a slide rail, a magnetic grating ruler, and a magnetic grating sensor; a slide rail arranged vertically is fixed inside the housing; a magnetic grating ruler is provided on the side of the slide rail facing the telescopic lead assembly; and a magnetic grating sensor that works in conjunction with the magnetic grating ruler is provided on the telescopic lead assembly.

[0009] Furthermore, the telescopic lead assembly includes a lead wire and a storage box; the slide rail is provided with a slidable storage box; the storage box is provided with a magnetic grating sensor, and an opening is provided on one side of the storage box; part of the lead wire is wound up in the storage box by a spiral spring, and part of it extends outward through the opening to the wire hole.

[0010] Furthermore, a return spring is provided between the outer wall of the storage box and the inner wall of the shell; the return spring is located on the side away from the opening of the storage box, and in its natural state, the return spring is in a tensioned state under the action of the weight of the storage box itself.

[0011] Furthermore, the length of the lead wire wound inside the storage box is less than the distance between the inner sides of the two corresponding wheels.

[0012] Furthermore, the lead wire has a magnetic attraction wire end located at one end of the wire hole.

[0013] Furthermore, the telescopic lead assembly also includes a guide wheel; the housing is provided with a rotatable guide wheel; the guide wheel is located in the vertical direction corresponding to the opening of the storage box; the lead wire passes through the opening, bypasses the guide wheel, and extends to the side of the housing after being guided.

[0014] Furthermore, it also includes a circuit board; the circuit board is provided inside the housing; the circuit board is electrically connected to the magnetic grating sensor and the laser emitter.

[0015] Furthermore, it also includes a fixing mechanism; the fixing mechanism includes a positioning block and an adsorption magnet; the positioning block is disposed on the outer side of the housing relative to the laser emitter's emitting end, and is perpendicular to the corresponding side; an adsorption magnet is provided on the outer wall of the housing below the positioning block.

[0016] The beneficial effects of this utility model are:

[0017] This utility model discloses a track wheel pair inner distance measuring device. A right triangle is constructed by connecting the extended end of the telescopic lead assembly to a laser point on the inner surface of the opposite wheel, the distance between the laser emitter's emitting end and the wire hole, and the distance from the laser emitter's emitting end to the opposite wheel. The line connecting the extended end of the telescopic lead assembly to the laser point on the inner surface of the opposite wheel is the length wound inside the storage box plus the sliding distance of the storage box measured by the magnetic grating. The distance from the laser emitter's emitting end to the opposite wheel is then calculated using the Pythagorean theorem, ultimately yielding the distance between the two wheels. This track wheel pair inner distance measuring device is small in size, easy to carry, has high measurement accuracy, and is simple to operate, significantly improving the efficiency and reliability of track wheel pair inner distance detection. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the inner distance measuring device for track wheelsets of this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the telescopic lead assembly of this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the shell of this utility model;

[0021] Figure 4 This is a structural schematic diagram of the casing of this utility model, with a magnetic attraction wire end;

[0022] Figure 5 This is a schematic diagram of the track wheelset inner distance measuring device of this utility model installed on the wheel to be measured;

[0023] Figure 6 This is another perspective view of the track wheelset inner distance measuring device of this utility model installed on the wheel to be measured;

[0024] Figure 7 This is a schematic diagram of the calculation principle of this utility model;

[0025] In the attached diagram: 1-Housing, 2-Telescopic lead wire assembly, 3-Magnetic grating assembly, 4-Laser emitter, 5-Wire hole, 6-Light transmission port, 7-Slide rail, 8-Magnetic grating ruler, 9-Magnetic grating sensor, 10-Lead wire, 11-Storage box, 12-Reset spring, 13-Magnetic attraction wire end, 14-Guide wheel, 15-Circuit board, 16-Positioning block, 17-Attracting magnet, 18-Wheel. Detailed Implementation

[0026] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0027] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also mean including the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0028] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0029] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. The meaning of such spatial relative terms includes different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, then an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0030] Example 1

[0031] See attached Figures 1-7 This utility model discloses a track wheelset inner distance measuring device, which mainly includes a telescopic lead wire assembly 2, a magnetic grating assembly 3, a laser emitter 4, a housing 1, a circuit board 15, and a fixing mechanism. The components cooperate with each other to complete the accurate measurement of the wheelset inner distance through the stretching of the fixed length lead wire 10, sliding displacement detection, laser positioning, and data calculation and processing.

[0032] Specifically, housing 1 serves as the overall support structure for the device. One side of housing 1 is the working side, facing the inner side of one wheel 18 during use. A fixing mechanism is provided on the outer wall of housing 1 to quickly and stably fix the entire device onto one of the wheels 18 to be tested. The fixing mechanism includes a positioning block 16 and an adsorption magnet 17. The positioning block 16 is fixedly set on the outer side opposite to the working side of housing 1 and is perpendicular to this outer side. The adsorption magnet 17 is set on the outer wall of housing 1 below the positioning block 16. During measurement, the positioning block 16 is brought into contact with the rim of one wheel 18, and the adsorption magnet 17 is adsorbed onto the inner side of the wheel 18, so that housing 1 is positioned between two wheels 18, and the working side of housing 1 faces the inner side of the other wheel 18 and is parallel to the inner side of the wheel 18. This achieves rapid positioning and limiting, and firmly fixes housing 1 onto the inner side of one wheel 18. Installation and disassembly are quick and easy, requiring no additional tools, and are suitable for rapid on-site testing. The housing 1 adopts a closed structure with sufficient installation space inside. The telescopic lead assembly 2, magnetic grid assembly 3, laser emitter 4, and circuit board 15 are installed inside the housing 1. The housing 1 protects the internal components and prevents external factors from affecting the measurement accuracy. One end of the telescopic lead assembly 2 is slidably connected to the magnetic grid assembly 3, and the other end is an extension end. On the same side of the housing 1, i.e., the working side, there is a wire hole 5 for the extension end of the telescopic lead assembly 2 to extend out and a light-transmitting port 6 for the laser emitter 4 to emit laser light. The extension end is located at the wire hole 5, and the emitting end of the laser emitter 4 is located at the light-transmitting port 6. The working side is parallel to the inner side of the wheel 18 through a fixing mechanism, and the line connecting the extension end and the emitting end of the laser emitter 4 is also parallel to the inner side of the wheel 18. During measurement, the laser emitter 4 emits a laser point towards the inner side of the opposite wheel 18. The extended end of the telescopic lead assembly 2 is pulled out from the wire hole 5 and moved towards the laser point on the inner side of the opposite wheel 18. When the fixed length of the telescopic lead assembly 2 is exhausted, it is triggered to slide along the magnetic grating assembly 3, causing the extended end to continue extending until it reaches the laser point emitted by the laser emitter 4 towards the inner side of the opposite wheel 18. Thus, a right triangle is constructed: the line connecting the wire hole 5 and the light-transmitting opening 6 is H1; the line connecting the extended end and the laser point on the inner side of the opposite wheel 18 is H; and the distance from the emitting end of the laser emitter 4 to the opposite wheel 18 is h. (See attached diagram.) Figure 7 As shown, H can be obtained by adding the fixed length of the telescopic lead assembly 2 to the sliding distance of the telescopic lead assembly 2 measured by the magnetic grating; H1 is shown in the attached figure. Figure 3 and attached Figure 4 As shown, the distance is a fixed distance, which can be measured in advance by other measuring devices. Then, h can be calculated using the Pythagorean theorem. The final distance between the inner sides of the two wheels 18 is h plus the thickness of the shell 1 and the thickness of the adsorption magnet 17.

[0033] Specifically, the magnetic grating assembly 3 includes a slide rail 7, a magnetic grating ruler 8, and a magnetic grating sensor 9, used to achieve high-precision displacement detection. The slide rail 7 is fixedly installed vertically inside the housing 1, providing stable sliding guidance for the telescopic lead assembly 2. The magnetic grating ruler 8 is fixedly installed on the side of the slide rail 7 facing the working side of the housing 1. The magnetic grating sensor 9 is fixedly connected to the telescopic lead assembly 2 and corresponds to and cooperates with the magnetic grating ruler 8, enabling real-time and accurate acquisition of the sliding displacement signal of the telescopic lead assembly 2. Compared with traditional caliper readings, the magnetic grating measurement method has higher measurement accuracy and reliability.

[0034] Specifically, the telescopic lead assembly 2 includes a lead wire 10, a storage box 11, a guide wheel 14, and a spiral spring. The storage box 11 is slidably mounted on the slide rail 7 and can move up and down along the slide rail 7. A magnetic grating sensor 9 is set inside the storage box 11 and moves synchronously with the storage box 11, so that the displacement of the storage box 11 can be detected in real time, thereby accurately measuring the sliding distance of the storage box 11. The storage box 11 is equipped with a spiral spring inside. An opening is located on one side of the storage box 11. A portion of the lead wire 10 is wound inside the storage box 11 by the spiral spring, while the other portion extends outward from the opening to the wire hole 5. During measurement, the lead wire 10 is pulled out through the wire hole 5 and moved towards the opposite wheel 18. Simultaneously, the lead wire 10 wound inside the storage box 11 is pulled out. The length of the lead wire 10 wound inside the storage box 11 is less than the distance between the inner sides of the two corresponding wheels 18. When the lead wire 10 wound inside the storage box 11 is completely pulled out, it will cause the storage box 11 to slide along the slide rail 7 to compensate for the remaining distance, thereby triggering the magnetic grid assembly 3 to detect the displacement of the storage box 11. After the tension on the lead wire 10 is removed, the lead wire 10 automatically retracts into the storage box 11 under the action of the spiral spring, achieving automatic storage and keeping the entire device compact for easy carrying and storage. Inside the housing 1, in the vertical direction corresponding to the opening of the storage box 11, a rotatable guide wheel 14 is also provided. After the lead wire 10 passes through the opening of the storage box 11, it first goes around the guide wheel 14, then changes direction, and finally extends to the wire hole 5 on the side of the housing 1. This prevents the lead wire 10 from getting stuck, tangled, or worn during the stretching and retraction process, ensuring smooth operation, and also preventing the lead wire 10 from interfering with other internal parts, as shown in the attached figure. Figure 1 As shown, when the opening of the storage box 11 is located on the bottom surface of the storage box 11, the guide wheel 14 is located below the opening. Alternatively, when the opening of the storage box 11 is located on the top surface of the storage box 11, the guide wheel 14 is located above the opening. A magnetic attraction wire end 13 is provided at one end of the lead wire 10 located at the wire hole 5. This magnetic attraction wire end 13 is magnetic and can reliably adhere to the inner side of the wheel 18, thereby achieving temporary fixation during measurement. A return spring 12 is provided between the outer wall of the storage box 11 and the inner wall of the housing 1. The return spring 12 is located on the side away from the opening of the storage box 11, as shown in the attached diagram. Figure 1As shown, when the opening of the storage box 11 is located on the bottom surface of the storage box 11, the guide wheel 14 is located below the opening, and the return spring 12 is located between the top surface of the storage box 11 and the inner wall of the housing 1. In its natural state, the storage box 11, under its own weight, keeps the return spring 12 in a stretched state, maintaining the initial balance of the storage box 11. After the lead wire 10 is fully pulled out, it drives the storage box 11 to continue sliding downward along the slide rail 7 against the force of the return spring 12. The return spring 12 will continue to be stretched. After the measurement is completed, the lead wire 10 is released, and the lead wire 10 automatically retracts into the storage box 11. The storage box 11 is then reset under the action of the return spring 12. It can be understood that when the opening of the storage box 11 is located on the top surface of the storage box 11, the guide wheel 14 is located above the opening, and the return spring 12 is located between the bottom surface of the storage box 11 and the inner wall of the housing 1. In its natural state, the storage box 11, under its own weight, keeps the return spring 12 in a compressed state, maintaining the initial balance of the storage box 11.

[0035] Specifically, circuit board 15 is electrically connected to magnetic grating sensor 9 and laser emitter 4. Circuit board 15 receives the sliding distance data of storage box 11 collected by magnetic grating sensor 9, and automatically calculates the distance between the inner sides of the two wheels 18 based on a preset Pythagorean theorem calculation model, combined with the fixed length of lead wire 10, the thickness of shell 1, the thickness of adsorption magnet 17, and the distance between wire hole 5 and light-transmitting opening 6. Circuit board 15 also integrates a wireless transmission module, which can wirelessly transmit the calculated inner distance data to an external handheld terminal for display, storage, and recording, realizing automated output of measurement data without manual reading and calculation, greatly improving detection efficiency.

[0036] The measurement process of the track wheel inner distance measuring device of this utility model:

[0037] The operator first secures the entire device to one side of the wheel 18 using a fixing mechanism. The positioning block 16 fits against the wheel rim, and the magnetic magnet 17 provides a stable adsorption force. The laser emitter 4 is activated, projecting a laser line onto the inner side of the opposite wheel 18 to form a positioning point. The operator pulls the magnetic attraction wire end 13 outwards, gradually extending the lead wire 10 from the storage box 11. Once the fixed length of the lead wire 10 in the storage box 11 is fully extended, the operator continues to pull the lead wire 10, causing the storage box 11 to slide downwards along the slide rail 7. The magnetic grating sensor 9 simultaneously collects the sliding displacement of the storage box 11 and transmits it to the circuit board 15. The operator continues to pull the lead wire 10 until the magnetic attraction wire end 13 is stably adsorbed onto the inner side of the opposite wheel 18 and precisely coincides with the laser point, completing the measurement and positioning. The circuit board 15 calculates the inner wheel distance based on the sliding displacement collected by the magnetic grating sensor 9 and preset parameters, and wirelessly transmits the result to the handheld terminal. After the measurement is completed, release the magnetic attraction wire 13. Under the action of the spiral spring and the return spring 12, the lead wire 10 and the storage box 11 will automatically return to their initial positions for easy carrying and next use.

[0038] All technical features in this embodiment can be freely combined according to actual needs. The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model. Technical aspects, shapes, and structures not described in detail in this utility model are all known technologies.

[0039] The above embodiments are preferred implementations of this utility model. In addition, other implementations are also included. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A rail wheel pair inside gauge measuring device, characterized by: It includes a telescopic lead assembly (2), a magnetic grid assembly (3), and a laser emitter (4); one end of the telescopic lead assembly (2) is slidably connected to the magnetic grid assembly (3), and the other end is an extended end; the line connecting the extended end and the emitting end of the laser emitter (4) is parallel to the inner side of the wheel (18). During measurement, after the extended end is pulled out and the fixed length of the telescopic lead assembly (2) is used up, the telescopic lead assembly (2) is triggered to slide along the magnetic grid assembly (3) to make the extended end continue to extend until the extended end reaches the laser point emitted by the laser emitter (4) to the inner side of the opposite wheel (18).

2. The track wheelset inner distance measuring device according to claim 1, characterized in that: It also includes a housing (1); the housing (1) is provided with a telescopic lead assembly (2), a magnetic grid assembly (3) and a laser emitter (4); the same side of the housing (1) is provided with a wire hole (5) for the extension end of the telescopic lead assembly (2) to extend and a light-transmitting port (6) for the laser emitter (4) to emit laser light.

3. A track wheel flange distance measuring device according to claim 2, characterized in that: The magnetic grating assembly (3) includes a slide rail (7), a magnetic grating ruler (8), and a magnetic grating sensor (9); the slide rail (7) is fixed inside the housing (1) and arranged in a vertical direction; the slide rail (7) is provided with a magnetic grating ruler (8) on the side facing the telescopic lead assembly (2); the telescopic lead assembly (2) is provided with a magnetic grating sensor (9) that works in conjunction with the magnetic grating ruler (8).

4. A track wheel flange distance measuring device according to claim 3, characterized in that: The telescopic lead assembly (2) includes a lead wire (10) and a storage box (11); the slide rail (7) is provided with a slidable storage box (11); the storage box (11) is provided with a magnetic grating sensor (9), and an opening is provided on one side of the storage box (11); part of the lead wire (10) is wound in the storage box (11) by a spiral spring, and part of it extends outward through the opening to the wire hole (5).

5. A track wheel flange distance measuring device according to claim 4, characterized in that: A return spring (12) is provided between the outer wall of the storage box (11) and the inner wall of the shell (1); the return spring (12) is located on the side away from the opening of the storage box (11), and in the natural state, the return spring (12) is in a tensioned state under the action of the weight of the storage box (11).

6. A rail wheel flange thickness measuring device according to claim 4, wherein: The length of the lead wire (10) wound inside the storage box (11) is less than the distance between the inner sides of the two corresponding wheels (18).

7. A track wheel flange distance measuring device according to claim 6, characterized in that The lead wire (10) has a magnetic attraction wire head (13) at one end located at the wire hole (5).

8. A device for measuring the inner gauge of a wheelset of a railway vehicle according to any one of claims 4 to 7, characterized in that: The telescopic lead assembly (2) also includes a guide wheel (14); the housing (1) is provided with a rotatable guide wheel (14); the guide wheel (14) is located in the vertical direction corresponding to the opening of the storage box (11); the lead (10) passes through the opening, goes around the guide wheel (14), and extends to the side of the housing (1) after being guided.

9. A rail wheel flange thickness measuring device according to claim 3, wherein: It also includes a circuit board (15); the housing (1) contains a circuit board (15); the circuit board (15) is electrically connected to the magnetic grating sensor (9) and the laser emitter (4).

10. A rail wheel flange thickness measuring device according to claim 2, wherein: It also includes a fixing mechanism; the fixing mechanism includes a positioning block (16) and an adsorption magnet (17); the positioning block (16) is set on the outer side of the housing (1) relative to the emitting end of the laser emitter (4) and is perpendicular to the corresponding side; an adsorption magnet (17) is provided on the outer wall of the housing (1) below the positioning block (16).

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