Non-contact three-dimensional track detection equipment

By designing a contactless three-dimensional track detection device, the stable locking of the equipment is achieved by using navigation positioning and locking components, the problem that existing equipment cannot be continuously and accurately detected is solved, and the stability and adaptability of the equipment are improved.

CN223253006UActive Publication Date: 2025-08-22HUANGHE S & T COLLEGE
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Patent Information

Application Number
CN202422648425.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-31
Publication Date
2025-08-22
Estimated Expiration
2034-10-31

AI Technical Summary

Technical Problem

Existing track detection equipment cannot perform continuous and accurate positioning and geometric detection, and is easily disturbed by external environment, resulting in poor adaptability.

Method used

A contactless three-dimensional track detection device is designed, including frame components, navigation and positioning components, data processing software and hardware platform components, data acquisition components, power components, locking components, positioning wheel components and gauge measurement modules. The stable locking of the equipment is achieved through navigation and positioning and locking components, and the data acquisition components conduct real-time inspection.

Benefits of technology

It realizes continuous and accurate three-dimensional orbit detection, improves the stability and adaptability of the equipment, and solves the problem of external environmental interference.

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Patent Text Reader

Abstract

The utility model discloses non-contact three-dimensional track detection equipment which is characterized in that a frame assembly of the detection equipment is transversely arranged, four groups of positioning wheel assemblies are respectively arranged at four corners of the bottom of the frame assembly, the left ends of a front cross rod and a rear cross rod of the frame assembly are connected with a left vertical rod, and the right ends of the front cross rod and the rear cross rod are connected with a right vertical rod; a plurality of reinforcing vertical rods are arranged between the front transverse rod and the rear transverse rod, a first box body of the vehicle body assembly is installed on the left half portion of the vehicle frame assembly, a second box body of the vehicle body assembly is installed on the right half portion of the vehicle frame assembly, the navigation positioning assembly is installed in the first box body, and the power source assembly is installed in the second box body. The data processing software and hardware platform assembly and the data acquisition assembly are both installed on the frame assembly and located between the first box body and the second box body, the gauge measurement module is installed at the bottom of the frame assembly, and the left end and the right end of the rear side of the vehicle body assembly are each provided with a locking assembly. The device is convenient to operate and high in adaptability, and the technical problem that existing detection equipment is easily interfered by the external environment is solved.
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Description

Technical Field

[0001] The utility model belongs to the technical field of railway track detection equipment, and in particular relates to a non-contact three-dimensional track detection equipment. Background Art

[0002] Railways, as a vital transportation infrastructure, play an irreplaceable role in road transportation, urban development, resource development, strategic deployment, cultural communication, and regional integration. As a fundamental and core component of the railway system, rails are subject to both microscopic surface defects and macroscopic track deformation due to contact friction, long-term loads, rail head core damage, rail welding, thermal expansion and contraction, and extended service. Microscopic surface defects include spalling, holes, scars, scratches, cracks, and wear. Macroscopic track deformation refers to the deformation of railway tracks from their designed position, primarily including track irregularity, height irregularity, superelevation irregularity, and gauge irregularity. Track irregularity refers to lateral deformation along the length of the track, height irregularity refers to vertical unevenness of the rails, and superelevation refers to the deviation of the height difference between the left and right rail top surfaces from the designed value. When a train travels along the track, track irregularity affects its trajectory and attitude angle. Track irregularity is a harmful signal for line maintenance, compromising train safety. If rail defects are left untreated for a long time, they can easily cause train instability or even shaking, and in severe cases, lead to derailment, resulting in casualties and significant property damage. However, existing track inspection equipment cannot continuously and accurately locate and monitor geometry, and is easily affected by external interference, resulting in poor adaptability. Therefore, a highly adaptable, non-contact, three-dimensional track inspection device is needed that can achieve continuous and accurate location and geometry inspection. Utility Model Content

[0003] In order to solve the deficiencies in the prior art, the utility model provides a non-contact three-dimensional track detection device which has strong adaptability and can realize continuous and accurate position positioning and geometric quantity detection.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions: non-contact three-dimensional track detection equipment, including a frame assembly, a body assembly, a navigation and positioning assembly, a data processing software and hardware platform assembly, a data acquisition assembly, a power supply assembly, two sets of locking assemblies, four sets of positioning wheel assemblies, a track gauge measurement module, four handles and a push rod;

[0005] The frame assembly is arranged horizontally, and the four sets of positioning wheel assemblies are respectively arranged at the four corners of the bottom of the frame assembly. The frame assembly includes a left vertical rod, a right vertical rod, a front cross rod, a rear cross rod, and a reinforcing vertical rod; the left vertical rod and the right vertical rod are arranged opposite to each other, the left ends of the front cross rod and the rear cross rod are connected to the left vertical rod, and the right ends of the front cross rod and the rear cross rod are connected to the right vertical rod. A number of reinforcing vertical rods are arranged between the front cross rod and the rear cross rod. The body assembly includes a first box body and a second box body, the first box body is installed on the left half of the frame assembly, and the second box body is installed on the right half of the frame assembly. The navigation and positioning assembly is installed in the first box body, and the power supply assembly is installed in the second box body;

[0006] The data processing software and hardware platform components and the data acquisition components are both installed on the frame assembly and located between the first box body and the second box body. The push rod is installed on the rear side of the frame assembly. The gauge measurement module is installed at the bottom of the frame assembly. A set of locking components is provided at each of the left and right ends of the rear side of the body assembly.

[0007] A reinforcing block is provided on each side of the front and rear of the connection between the front cross bar and the left vertical bar, a reinforcing block is provided on each side of the connection between the front cross bar and the right vertical bar, a reinforcing block is provided on each side of the connection between the rear cross bar and the left vertical bar, a reinforcing block is provided on each side of the connection between the rear cross bar and the right vertical bar, a T-shaped slot is provided on the rear side of the rear cross bar, a handle is provided on the front and rear part of the left side of the left vertical bar, and a handle is provided on the front and rear part of the right side of the right vertical bar.

[0008] The first box body and the second box body have the same structure, both comprising a box body portion with an upper opening and a bottom closed, wherein the bottom of the box body portion extends to the left and right sides to be provided with a left flange portion and a right flange portion.

[0009] The navigation and positioning component includes a mounting connection plate and an inertial measurement unit physical terminal. The mounting connection plate is connected to the bottom of the first box body, and the inertial measurement unit physical terminal is arranged on the mounting connection plate.

[0010] The data processing software and hardware platform components include a mounting platform, a platform bracket, and an image data processing terminal. The platform bracket includes a column and a disc. The disc is set at the bottom of the column. The column is connected to the frame component through the disc. The mounting platform is connected to the top of the column. The image data processing terminal is installed on the mounting platform.

[0011] The data acquisition component includes a collection bracket and a data acquisition terminal. The bottom of the collection bracket is connected to the frame component, and the data acquisition terminal is arranged on the collection bracket.

[0012] The positioning wheel assembly includes a rail top positioning wheel assembly and a rail direction positioning wheel assembly;

[0013] The rail top positioning wheel assembly includes a positioning wheel frame, a front positioning block, a rear positioning block, a rail top positioning wheel, and a mounting shaft; the positioning wheel frame includes an upper plate, a left vertical plate, and a right vertical plate; the front positioning block and the rear positioning block are symmetrically provided on the front and rear parts of the upper upper plate; the upper plate is connected to the bottom of the frame assembly; the left vertical plate and the right vertical plate are correspondingly provided with left mounting holes and right mounting holes; the rail top positioning wheel is installed between the left vertical plate and the right vertical plate through the mounting shaft, the left mounting hole, and the right mounting hole; the right side of the right vertical plate is provided with an extension portion extending to the right, and the rail positioning wheel assembly is installed on the extension portion;

[0014] The rail-direction positioning wheel assembly comprises a threaded shaft and a rail-direction positioning wheel. The top of the threaded shaft is connected to the extension part, and the rail-direction positioning wheel is installed at the bottom of the threaded shaft.

[0015] The gauge measurement module includes a docking frame and a distance measuring sensor. The docking frame includes a docking vertical plate, an upper cross plate and a lower cross plate. The left end of the upper cross plate is connected to the top of the docking vertical plate, the left end of the lower cross plate is connected to the right end of the docking vertical plate, the upper cross plate is connected to the bottom of the frame assembly, and the distance measuring sensor is installed at the bottom of the lower cross plate.

[0016] The locking assembly includes a locking frame, a handle, a sliding rod, and a brake block. The locking frame includes a front vertical plate and a rear horizontal plate. The front end of the rear horizontal plate is connected to the top of the front vertical plate. A through hole is provided on the rear horizontal plate. The sliding rod is slidably connected to the rear horizontal plate through the through hole. The bottom of the sliding rod is connected to the brake block. The front vertical plate is connected to the rail top positioning assembly. The handle is an L-shaped handle, including a long handle and a short handle. The right end of the short handle is hinged to the top of the sliding rod through a first connecting pin, and the left end of the short handle is connected to the lower end of the long handle. The connection between the long handle and the short handle is hinged to a sliding link through a second connecting pin, and the lower end of the sliding link is hinged to the locking frame through a third connecting pin.

[0017] When the present application is used, the operator lifts the detection device by the handle and gently places it on the track, so that the rail-toward positioning wheel of the rail-toward positioning wheel assembly is located 16 mm below the top surface of the track, and the rail-toward positioning wheel rotates along the side of the track during movement. The rail-top positioning wheel of the rail-top positioning wheel assembly is placed on the top surface of the track and rotates along the track during movement. After placement is completed, the two locking assembly handles are rotated to drive the brake blocks thereon to move downward, and the friction between the brake blocks and the top surface of the track is used to lock the detection device on the guide rail. The position and posture of each data acquisition module terminal are adjusted, and the data transmission and detection analysis module is turned on at the same time to ensure the normal operation of the data acquisition and processing status. The two locking assembly handles are rotated to drive the brake blocks thereon to move upward, and the brake blocks leave the top surface of the track, so that the detection device is in a loosened state. The detection device is pushed forward along the track by the push rod to realize real-time positioning and detection of track geometry.

[0018] To sum up, the utility model is simple to operate and has strong stability, and can realize continuous and accurate three-dimensional track detection, effectively solving the technical problems that existing track detection equipment cannot perform continuous and accurate position positioning and geometric quantity detection and is easily affected by external environment interference, resulting in poor adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of the utility model from the first perspective;

[0020] Figure 2 This is a schematic structural diagram of the utility model from a second viewing angle;

[0021] Figure 3 It is a structural diagram of the frame assembly of the utility model;

[0022] Figure 4 It is a structural diagram of the first box body of the utility model;

[0023] Figure 5 It is a structural diagram of the data processing software and hardware platform components of the utility model;

[0024] Figure 6 This is a structural diagram of the data acquisition component of the utility model:

[0025] Figure 7 It is a structural diagram of the positioning wheel assembly of the utility model;

[0026] Figure 8 This is a structural diagram of the locking assembly of the utility model in a released state;

[0027] Figure 9 This is a structural diagram of the intermediate state of the locking assembly of the utility model;

[0028] Figure 10 This is a structural diagram of the locking assembly of the utility model in a locked state;

[0029] Figure 11 It is a structural diagram of the track gauge measurement module of the utility model;

[0030] Figure 12 It is a structural schematic diagram of the push rod of the utility model. DETAILED DESCRIPTION

[0031] like Figures 1-12 As shown, the non-contact three-dimensional track detection equipment of the present invention includes a frame assembly 1, a vehicle body assembly 24, a navigation and positioning assembly 2, a data processing software and hardware platform assembly 3, a data acquisition assembly 4, a power supply assembly 5, two sets of locking assemblies 6, four sets of positioning wheel assemblies, a track gauge measurement module 9, four handles 10 and a push rod 11;

[0032] The frame assembly 1 is arranged horizontally, and the four sets of positioning wheel assemblies are respectively arranged at the four corners of the bottom of the frame assembly 1. The frame assembly 1 includes a left vertical rod 14, a right vertical rod 15, a front cross bar 16, a rear cross bar 17, and a reinforcing vertical rod 18; the left vertical rod 14 and the right vertical rod 15 are arranged opposite to each other, the left ends of the front cross bar 16 and the rear cross bar 17 are connected to the left vertical rod 14, and the right ends of the front cross bar 16 and the rear cross bar 17 are connected to the right vertical rod 15. A plurality of reinforcing vertical rods 18 are arranged between the front cross bar 16 and the rear cross bar 17. The body assembly 24 includes a first box body 12 and a second box body 13. The first box body 12 is mounted on the left half of the frame assembly 1, and the second box body 13 is mounted on the right half of the frame assembly 1. The navigation and positioning assembly 2 is mounted in the first box body 12, and the power supply assembly 5 is mounted in the second box body 13;

[0033] The data processing software and hardware platform component 3 and the data acquisition component 4 are both installed on the frame component 1 and located between the first box body 12 and the second box body 13. The push rod 11 is installed on the rear side of the frame component 1. The gauge measurement module 9 is installed at the bottom of the frame component 1. A set of locking components 6 are respectively provided at the left and right ends of the rear side of the body component 24.

[0034] A reinforcing block 19 is provided on each side of the front and rear ends of the connection between the front cross bar 16 and the left vertical bar 14, a reinforcing block 19 is provided on each side of the connection between the front cross bar 16 and the right vertical bar 15, a reinforcing block 19 is provided on each side of the connection between the rear cross bar 17 and the left vertical bar 14, a reinforcing block 19 is provided on each side of the connection between the rear cross bar 17 and the right vertical bar 15, a T-slot 20 is provided on the rear side of the rear cross bar 17, a handle 10 is provided on the front and rear portions of the left side of the left vertical bar 14, and a handle 10 is provided on the front and rear portions of the right side of the right vertical bar 15.

[0035] The first box body 12 and the second box body 13 have the same structure, and both include a box body portion 21 with an open top and a closed bottom. The bottom of the box body portion 21 extends to the left and right sides to form a left flange portion 22 and a right flange portion 23.

[0036] The navigation and positioning assembly 2 includes a mounting plate connected to the bottom of the first housing 12 and a physical terminal for the inertial measurement unit. The mounting plate is connected to the bottom of the first housing 12, and the physical terminal for the inertial measurement unit is located on the mounting plate. The power supply assembly 5 includes a mounting plate connected to the bottom of the second housing 13 and a battery located on the mounting plate.

[0037] The data processing hardware and software platform assembly 3 includes a mounting platform 28, a platform bracket, and an image data processing terminal 29. The platform bracket includes a column 30 and a disk 31. The disk 31 is arranged at the bottom of the column 30. The column 30 is connected to the frame assembly 1 through the disk 31. The mounting platform 28 is connected to the top of the column 30. The image data processing terminal 29 is installed on the mounting platform 28.

[0038] The data acquisition component 4 includes a data acquisition bracket 32 ​​and a data acquisition terminal 33 . The bottom of the data acquisition bracket 32 ​​is connected to the vehicle frame component 1 , and the data acquisition terminal 33 is arranged on the data acquisition bracket 32 ​​.

[0039] The positioning wheel assembly includes a rail top positioning wheel assembly 8 and a rail direction positioning wheel assembly 7;

[0040] The rail top positioning wheel assembly 8 includes a positioning wheel frame 34, a front positioning block 35, a rear positioning block 36, a rail top positioning wheel 37, and a mounting shaft 25; the positioning wheel frame 34 includes an upper plate, a left vertical plate, and a right vertical plate. The front positioning block 35 and the rear positioning block 36 are symmetrically provided on the front and rear parts of the upper plate. The upper plate is connected to the bottom of the frame assembly 1. The left vertical plate and the right vertical plate are correspondingly provided with left mounting holes and right mounting holes. The rail top positioning wheel 37 is installed between the left vertical plate and the right vertical plate through the mounting shaft 25, the left mounting hole, and the right mounting hole. The right side of the right vertical plate is provided with an extension portion 39 extending to the right, and the rail positioning wheel assembly 7 is installed on the extension portion 39;

[0041] The rail-aligned positioning wheel assembly 7 includes a threaded shaft 40 and a rail-aligned positioning wheel 41 . The top of the threaded shaft 40 is connected to the extension portion 39 , and the rail-aligned positioning wheel 41 is installed at the bottom of the threaded shaft 40 .

[0042] The gauge measurement module 9 includes a docking frame 47 and a distance measuring sensor 48. The docking frame 47 includes a docking vertical plate, an upper horizontal plate and a lower horizontal plate. The left end of the upper horizontal plate is connected to the top of the docking vertical plate, the left end of the lower horizontal plate is connected to the right end of the docking vertical plate, the upper horizontal plate is connected to the bottom of the frame assembly 1, and the distance measuring sensor 48 is installed at the lower part of the lower horizontal plate.

[0043] The locking assembly 6 includes a locking frame 42, a handle 43, a sliding rod 44, and a brake block 45. The locking frame 42 includes a front vertical plate and a rear horizontal plate. The front end of the rear horizontal plate is connected to the top of the front vertical plate. A through hole is provided on the rear horizontal plate. The sliding rod 44 is slidably connected to the rear horizontal plate through the through hole. The bottom of the sliding rod 44 is connected to the brake block 45. The front vertical plate is connected to the rail top positioning assembly. The handle 43 is an L-shaped handle, including a long handle 49 and a short handle 50. The right end of the short handle 50 is hinged to the top of the sliding rod 44 through a first connecting pin 51, and the left end of the short handle 50 is connected to the lower end of the long handle 49. The connection between the long handle 49 and the short handle 50 is hinged to a sliding link 54 through a second connecting pin 52. The lower end of the sliding link 54 is hinged to the locking frame 42 through a third connecting pin 53. Figure 8 As shown, when the locking assembly is in the released state, the long handle 49 of the handle 43 is located below the top of the sliding rod 44. When locking is required, the handle 43 is rotated clockwise, as shown in FIG. Figure 9 As shown, it is the middle state of the locking assembly. At this time, the sliding rod 44 drives the brake block 45 to move downward gradually. Figure 10As shown, when handle 43 is rotated 180°, brake shoe 45 moves downward to its maximum distance, reaching a locked position, locking the testing device to the track. During testing, handle 43 is rotated 180° counterclockwise, and brake shoe 45 gradually moves upward to a released position, allowing the testing device to move along the track. Push rod 11 includes a connecting block 46 and a T-handle 38. Connecting block 46 is mounted in T-slot 20 on the rear side of frame assembly 1, and the bottom of T-handle 38 is mounted on the connecting block.

[0044] When the present application is used, the operator lifts the detection device by the handle 10 and gently places it on the track, so that the rail-toward positioning wheel 41 of the rail-toward positioning wheel assembly 7 is located 16 mm below the top surface of the track, and the rail-toward positioning wheel 41 rotates along the side of the track during movement, and the rail-top positioning wheel 37 of the rail-top positioning wheel assembly 8 is placed on the top surface of the track and rotates along the track during movement. After the placement is completed, the handles 43 of the two locking assemblies 6 are rotated to Figure 10 The position shown in the figure is to move the brake block 45 of the locking assembly 6 downward to lock the detection device on the guide rail. Adjust the position and posture of each data acquisition module terminal and turn on the data transmission and detection analysis module at the same time to ensure the normal operation of data acquisition and processing. Rotate the handles 43 of the two locking assemblies 6 to Figure 8 The position shown is shown, and the brake block 45 of the locking assembly 6 is moved upward, unlocking the locking assembly 6 and releasing the detection device. The detection device is then pushed forward along the track by the push rod 11, achieving real-time positioning and detection of track geometry. The present utility model is simple to operate and has strong stability, enabling continuous and accurate three-dimensional track detection, effectively resolving the technical problems of existing track detection equipment that are unable to perform continuous and accurate position positioning and geometric detection and are easily affected by external environmental interference, resulting in poor adaptability.

[0045] It should be emphasized that the inertial measurement unit physical terminal, image data processing terminal 29, data acquisition terminal 33, and ranging sensor 48 in the present invention are all conventional technologies, and their specific structures and principles will not be described in detail. The automatic control involved in the present invention does not involve new computer programs.

[0046] This embodiment does not impose any formal restrictions on the shape, material, structure, etc. of the utility model. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the utility model are within the scope of protection of the technical solution of the utility model.

Claims

1. Non-contact three-dimensional track detection equipment, characterized by: It includes a frame assembly, a vehicle body assembly, a navigation and positioning assembly, a data processing software and hardware platform assembly, a data acquisition assembly, a power supply assembly, two sets of locking assemblies, four sets of positioning wheel assemblies, a gauge measurement module, four handles and a push rod; The frame assembly is arranged horizontally, and the four sets of positioning wheel assemblies are respectively arranged at the four corners of the bottom of the frame assembly. The frame assembly includes a left vertical rod, a right vertical rod, a front cross rod, a rear cross rod, and a reinforcing vertical rod; the left vertical rod and the right vertical rod are arranged opposite to each other, the left ends of the front cross rod and the rear cross rod are connected to the left vertical rod, and the right ends of the front cross rod and the rear cross rod are connected to the right vertical rod. A number of reinforcing vertical rods are arranged between the front cross rod and the rear cross rod. The body assembly includes a first box body and a second box body, the first box body is installed on the left half of the frame assembly, and the second box body is installed on the right half of the frame assembly. The navigation and positioning assembly is installed in the first box body, and the power supply assembly is installed in the second box body; The data processing software and hardware platform components and the data acquisition components are both installed on the frame assembly and located between the first box body and the second box body. The push rod is installed on the rear side of the frame assembly. The gauge measurement module is installed at the bottom of the frame assembly. A set of locking components is provided at each of the left and right ends of the rear side of the body assembly.

2. The non-contact three-dimensional track detection device according to claim 1, characterized in that: A reinforcing block is provided on each side of the front and rear of the connection between the front cross bar and the left vertical bar, a reinforcing block is provided on each side of the connection between the front cross bar and the right vertical bar, a reinforcing block is provided on each side of the connection between the rear cross bar and the left vertical bar, a reinforcing block is provided on each side of the connection between the rear cross bar and the right vertical bar, a T-shaped slot is provided on the rear side of the rear cross bar, a handle is provided on the front and rear part of the left side of the left vertical bar, and a handle is provided on the front and rear part of the right side of the right vertical bar.

3. The non-contact three-dimensional track detection device according to claim 2, characterized in that: The first box body and the second box body have the same structure, both comprising a box body portion with an upper opening and a bottom closed, wherein the bottom of the box body portion extends to the left and right sides to be provided with a left flange portion and a right flange portion.

4. The non-contact three-dimensional track detection device according to claim 3, characterized in that: The navigation and positioning component includes a mounting connection plate and an inertial measurement unit physical terminal. The mounting connection plate is connected to the bottom of the first box body, and the inertial measurement unit physical terminal is arranged on the mounting connection plate.

5. The non-contact three-dimensional track detection device according to claim 4, characterized in that: The data processing software and hardware platform components include a mounting platform, a platform bracket, and an image data processing terminal. The platform bracket includes a column and a disc. The disc is set at the bottom of the column. The column is connected to the frame component through the disc. The mounting platform is connected to the top of the column. The image data processing terminal is installed on the mounting platform. The data acquisition component includes a collection bracket and a data acquisition terminal. The bottom of the collection bracket is connected to the frame component, and the data acquisition terminal is arranged on the collection bracket.

6. The non-contact three-dimensional track detection device according to claim 5, characterized in that: The positioning wheel assembly includes a rail top positioning wheel assembly and a rail direction positioning wheel assembly; The rail top positioning wheel assembly includes a positioning wheel frame, a front positioning block, a rear positioning block, a rail top positioning wheel, and a mounting shaft; the positioning wheel frame includes an upper plate, a left vertical plate, and a right vertical plate; the front positioning block and the rear positioning block are symmetrically provided on the front and rear parts of the upper upper plate; the upper plate is connected to the bottom of the frame assembly; the left vertical plate and the right vertical plate are correspondingly provided with left mounting holes and right mounting holes; the rail top positioning wheel is installed between the left vertical plate and the right vertical plate through the mounting shaft, the left mounting hole, and the right mounting hole; the right side of the right vertical plate is provided with an extension portion extending to the right, and the rail positioning wheel assembly is installed on the extension portion; The rail-direction positioning wheel assembly comprises a threaded shaft and a rail-direction positioning wheel. The top of the threaded shaft is connected to the extension part, and the rail-direction positioning wheel is installed at the bottom of the threaded shaft.

7. The non-contact three-dimensional track detection device according to claim 6, characterized in that: The gauge measurement module includes a docking frame and a distance measuring sensor. The docking frame includes a docking vertical plate, an upper cross plate and a lower cross plate. The left end of the upper cross plate is connected to the top of the docking vertical plate, the left end of the lower cross plate is connected to the right end of the docking vertical plate, the upper cross plate is connected to the bottom of the frame assembly, and the distance measuring sensor is installed at the bottom of the lower cross plate. The locking assembly includes a locking frame, a handle, a sliding rod, and a brake block. The locking frame includes a front vertical plate and a rear horizontal plate. The front end of the rear horizontal plate is connected to the top of the front vertical plate. A through hole is provided on the rear horizontal plate. The sliding rod is slidably connected to the rear horizontal plate through the through hole. The bottom of the sliding rod is connected to the brake block. The front vertical plate is connected to the rail top positioning assembly. The handle is an L-shaped handle, including a long handle and a short handle. The right end of the short handle is hinged to the top of the sliding rod through a first connecting pin, and the left end of the short handle is connected to the lower end of the long handle. The connection between the long handle and the short handle is hinged to a sliding link through a second connecting pin, and the lower end of the sliding link is hinged to the locking frame through a third connecting pin.