A laser tunnel cross section detector

Abstract

This invention relates to the field of tunnel inspection technology and discloses a laser tunnel cross-section detector, including a support frame with a mounting platform on top. The cross-section detector is connected to the mounting platform. The operator moves the cross-section detector to the location where the tunnel cross-section needs to be inspected, and then starts the detector to scan the outline of the tunnel cross-section. When the vibration generated during construction is transmitted to the support frame, the support frame moves upward due to the vibration, which drives the leveling component and / or hydraulic component to move. Through the hydraulic component and / or leveling component, the vibration of the support frame is significantly reduced, ensuring the stability of the cross-section detector during inspection. This effectively prevents the support frame from being affected by the vibration generated during tunnel construction, thus preventing the cross-section detector from vibrating and causing large fluctuations in the outline scanned by the detector, thereby ensuring the accuracy of the inspection.

Description

Technical Field

[0001] This invention relates to the field of tunnel inspection equipment technology, specifically a laser tunnel cross-section detector. Background Technology

[0002] The laser tunnel cross-section detector is an intelligent measuring device based on laser ranging and computer technology. Its core function is to quickly and non-contactly acquire three-dimensional contour data of underground spaces such as tunnels. The instrument's core working principle is polar coordinate measurement. Through laser ranging, rotation scanning, and data processing, it can quickly and conveniently obtain cross-section data in construction monitoring, completion acceptance, and quality control. During tunnel construction, using a laser detector to measure the tunnel's internal contour cross-section plays a very important role in improving project quality, shortening the construction cycle, and saving project funds.

[0003] During tunnel construction, laser detectors are often used to measure the tunnel's internal profile and assess over- or under-excavation. Due to the length of the tunnel, multiple sections need to be measured. To ensure tunnel excavation efficiency, the detection usually follows the excavation process and is completed in the shortest possible time. At this time, other work in the local area near the detection section may be temporarily suspended, but the entire tunnel project may still be under construction in other sections. The vibrations generated by construction may be transmitted to the location of the detector, reducing its stability and affecting the accuracy of the detection. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a laser tunnel cross-section detector, comprising a detector body, a mounting platform, and a support frame. The detector body is connected to the mounting platform, and the mounting platform is mounted on the top of the support frame via an adjustment mechanism. The adjustment mechanism includes a leveling component, which comprises:

[0005] At least two linear telescopic components are distributed circumferentially at equal intervals on the bottom of the mounting platform;

[0006] A connecting frame is fixedly mounted on the support frame corresponding to the linear telescopic component;

[0007] The lever frame includes a support rod, a sliding collar, and a fixed frame. One end of the support rod is slidably connected to the connecting frame via the sliding collar, and the other end of the support rod is connected to the linear telescopic assembly. One end of the fixed frame is fixed to the outer wall of the linear telescopic assembly, and the other end of the fixed frame is rotatably connected to the support rod.

[0008] The laser tunnel cross-section detector of this embodiment utilizes the dynamic sliding connection between the sliding collar and the support rod in the lever frame, as well as the mutual cooperation of multiple sets of linear telescopic components, to absorb and buffer the external forces received by the laser tunnel cross-section detector in real time, thereby maintaining its stability during the detection process and ensuring the accuracy of the detection data such as laser ranging and rotation scanning of the detector body.

[0009] In some alternative embodiments, the linear telescopic assembly includes a piston cylinder and a piston rod, the outer wall of the piston cylinder is connected to one end of the fixed frame, a telescopic spring is sleeved on the portion of the piston rod extending out of the piston cylinder, and the piston rod extending out of the piston cylinder is connected to the support rod.

[0010] Furthermore, the linear telescopic assembly is a pneumatic piston assembly, and each piston cylinder has a throttling orifice on its inner wall.

[0011] During the tunnel cross-section inspection process by the cross-section detector, when the support frame is subjected to vibrations caused by construction at other locations in the tunnel, such as when the support frame is subjected to horizontal vibrations and moves slightly to the right or left, the support frame will drive the corresponding lever frame to rotate, causing another lever frame on the opposite side to rotate as well. The rotation of the lever frame will cause it to tilt. At this time, the lever principle will drive the piston rod to move linearly, and the telescopic spring will also accumulate rebound force. The movement of the piston rod in the piston cylinder will compress its internal space, and the gas will be discharged through the throttle orifice. However, because the throttle orifice is small, it will also generate a large resistance to the piston rod during the exhaust process, which will consume the thrust of the piston rod and slow down its movement speed, thereby reducing the amplitude of the support frame and ensuring the accuracy of the laser scanning benchmark of the cross-section detector.

[0012] In some optional embodiments, the support rod is an arc-shaped rod, with one end away from the linear telescopic assembly extending toward the center of the mounting platform and slidably connected to the connecting frame via a sliding collar, the sliding collar being able to swing relative to the vertical line of the support frame under the action of an external force; preferably, the fixing frame is an L-shaped rod.

[0013] In some alternative embodiments, the support rod is slidably connected to the linear telescopic assembly via a second sliding collar, which can swing relative to the horizontal line under the action of an external force.

[0014] The rotational connection between the support rod and the fixed frame is the rotational center of the lever frame. The unequal distances from the two ends of the support rod to this rotational connection can form a lever structure. By utilizing the combined action of lever mechanics and linear telescopic components, the stability of the detection process of the main body of the detector in this application can be ensured, and the validity of its detection data can be guaranteed.

[0015] In some optional embodiments, the adjustment mechanism further includes a hydraulic assembly disposed between the support frame and the mounting platform, the hydraulic assembly including a hydraulic cylinder and a piston plate, and a plurality of the linear telescopic components being equidistantly distributed on the outer wall of the hydraulic cylinder.

[0016] Furthermore, the piston plate is provided with a piston rod, which extends out of the hydraulic cylinder and is connected to the support frame; a pressure spring is fitted onto the portion of the piston rod extending out of the hydraulic cylinder.

[0017] By incorporating hydraulic components, interference from external forces can be absorbed in the longitudinal direction, further ensuring the stability of the main body of the detector during operation.

[0018] In some optional embodiments, the adjusting mechanism further includes a compression assembly, which includes a compression plate sleeved on the piston rod. The compression plate has mounting holes adapted to the piston rod. The compression plate is located above the pressure spring and can apply pressure to the pressure spring under the action of the driving mechanism.

[0019] Furthermore, the edge of the extrusion plate has a bevel, and the driving mechanism includes an extrusion block adapted to the bevel of the extrusion plate. When the extrusion block moves toward the extrusion plate, the extrusion plate moves axially along the piston column and extrudes the pressure spring.

[0020] Furthermore, the driving mechanism also includes an extrusion frame and an adjusting screw. The extrusion frame can move in a direction perpendicular to the piston column axis under the rotation of the adjusting screw. The extrusion frame can drive the extrusion block to move. The extrusion block is in contact with the extrusion frame, or the extrusion block and the extrusion frame are an integral structure.

[0021] By further configuring a compression component that is compatible with the hydraulic components, the compression component can pre-compress the pressure elasticity in the hydraulic components, so that the pressure spring has elastic potential energy in advance, compressing the hydraulic cylinder, thereby supporting the mounting platform and keeping the cross-section detector stable. Subsequently, the cross-section detector scans the contour of the tunnel cross-section through laser ranging, rotation scanning and data processing, thereby obtaining the curve of the tunnel cross-section, and thus determining whether the tunnel cross-section is over-excavated or under-excavated.

[0022] The present invention has the following beneficial effects:

[0023] (1) When using this invention, the operator moves the cross-section detector to the location where the tunnel cross-section needs to be inspected. Then, the cross-section detector is stabilized by the leveling component and / or hydraulic component. The cross-section detector is then started to scan the contour of the tunnel cross-section. During the tunnel cross-section inspection process, in order to speed up construction, when other sections in the tunnel are still under construction, when the vibration generated by the construction is transmitted to the position of the support frame, the support frame will move due to the vibration. This will drive the leveling component and / or hydraulic component to move. By using the leveling component and / or hydraulic component, the vibration of the support frame is reduced, ensuring the stability of the cross-section detector during inspection. This effectively prevents the support frame from vibrating due to the vibration generated by the tunnel construction, which could cause the cross-section detector to vibrate and easily cause large fluctuations in the contour line scanned by the cross-section detector. This ensures the accuracy of the inspection.

[0024] (2) The present invention can also press the extrusion plate on the inclined surface by extrusion assembly. The extrusion assembly makes the elastic potential energy of the pressure spring under the extrusion plate tend to be stable, and at the same time, it will apply a certain strong reaction force to the extrusion frame. When the support frame moves up and down under vibration, the elastic potential energy of the pressure spring can effectively consume the adverse force, thereby stably supporting the mounting platform and the cross-section detector.

[0025] (3) In the process of the cross-section detector detecting the tunnel cross-section, when the support frame is subjected to horizontal vibration force generated by the tunnel construction, for example, when the support frame moves slightly to the right, the support frame will drive the connecting frame to push the lever frame to rotate. Through the connecting frame and the linear telescopic component, a large resistance will be generated, which will consume the thrust of the piston rod, thereby slowing down the movement speed of the piston rod. Through the cooperation of another or more connecting frames and linear telescopic components on the opposite side, the piston rod on one side descends to compress gas and the piston rod on the other side rises to compress gas, which can fully reduce the horizontal and longitudinal movement distance of the connecting frame and the support frame, reduce the vibration amplitude of the support frame, and effectively prevent the support frame from generating large horizontal vibration, which would cause the reference deflection of the laser scanning of the cross-section detector. In addition, by reducing the vertical and horizontal vibration of the support frame, the two complement each other and can dissipate the vibration energy from all directions at the same time, which can more effectively suppress the amplitude. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is another structural schematic diagram of the present invention;

[0029] Figure 3 This is a schematic diagram of the adjustment mechanism of the present invention;

[0030] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0031] Figure 5 This is a partial cross-sectional schematic diagram of the adjustment mechanism of the present invention;

[0032] Figure 6 The figures show a cross-sectional view of the hydraulic component and a structural schematic diagram of the extrusion component of the present invention.

[0033] In the picture:

[0034] 100. Main body of the detector; 200. Mounting platform; 300. Support frame; 400. Adjustment mechanism;

[0035] 41. Leveling assembly; 411. Connecting frame; 412. Support rod; 413. Sliding collar one; 414. Fixing frame; 415. Piston cylinder; 416. Piston rod; 417. Telescopic spring; 418. Throttling orifice; 419. Sliding collar two;

[0036] 42. Hydraulic components; 421. Hydraulic cylinder; 422. Piston plate; 423. Piston rod; 424. Pressure spring;

[0037] 43. Extrusion assembly; 431. Extrusion plate; 432. Extrusion block; 433. Extrusion frame; 434. Adjusting screw. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Example 1

[0040] This embodiment provides a laser tunnel cross-section detector, such as... Figure 1 and Figure 2 As shown, the device includes a main body 100 of the detector, a mounting platform 200, and a support frame 300. The main body 100 of the detector is fixedly connected to the mounting platform 200, and the mounting platform 200 is mounted on the top of the support frame 300 through an adjustment mechanism 400.

[0041] The adjustment mechanism 400 includes a leveling component 41, such as Figure 3 As shown, the leveling assembly 41 includes at least two linear telescopic assemblies, which are distributed circumferentially at equal intervals on the bottom of the mounting platform 200. These linear telescopic assemblies can be conventional hydraulic piston assemblies, pneumatic piston assemblies, connecting rod / crank slider mechanisms, scissor lift mechanisms, etc., found in the mechanical field. Each linear telescopic assembly is provided with a corresponding connecting frame 411, which is fixedly mounted on the support frame 300. The leveling assembly 41 also includes a lever frame, which includes a support rod 412, a sliding collar 413, and a fixing frame 414. One end of the support rod 412 is slidably connected to the connecting frame 411 via the sliding collar 413, and the other end of the support rod 412 is connected to the linear telescopic assembly. One end of the fixing frame 414 is fixed to the outer wall of the linear telescopic assembly, and the other end of the fixing frame 414 is rotatably connected to the support rod 412. This rotatable connection constitutes the fulcrum of the lever frame. The two ends of the support rod 412 are not equidistant from the fulcrum, thereby achieving lever arms of different lengths to buffer and absorb external forces on the stability of the main body of the detector in this application, ensuring the stability of the detector.

[0042] like Figure 3 and Figure 4 As shown, the linear telescopic assembly is a pneumatic telescopic mechanism or a hydraulic telescopic mechanism including a piston cylinder 415 and a piston rod 416. The outer wall of the piston cylinder 415 is fixedly connected to one end of the fixed frame 414. One end of the piston rod 416 extending out of the piston cylinder 415 is connected to the support rod 412. The part of the piston rod 416 extending out of the piston cylinder 415 is fitted with a telescopic spring 417.

[0043] Preferably, the linear telescopic assembly is a pneumatic piston assembly, and the inner wall of the piston cylinder 415 is provided with a throttling orifice 418 to provide damping and dissipate vibration energy when the piston rod 416 moves. In conventional vibration absorption structures in the art, pure springs or rubber pads are often used for vibration reduction. Although such passive vibration reduction methods are simple in structure, they are prone to resonance or reset hysteresis under continuous or low-frequency vibration environments, affecting the long-term maintenance of the measurement reference. In this embodiment, the pneumatic piston and the throttling orifice 418 are used to form velocity-dependent damping, which can effectively suppress resonance and adapt to vibrations of different amplitudes through the nonlinear characteristics of airflow throttling.

[0044] In this embodiment, the support rod 412 is preferably an arc-shaped rod, such as... Figure 3As shown, the end of the support rod 412 furthest from the linear telescopic assembly extends towards the center of the mounting platform 200 and is slidably connected to the connecting frame 411 via a sliding collar 413. The sliding collar 413 can swing relative to the vertical direction of the support frame 300 under external force, thereby causing the support rod 412 to rotate at the pivot point on the lever frame, resulting in linear motion of the linear telescopic mechanism on the other side of the drive rotating bracket. The fixed frame 414 is preferably an L-shaped rod, facilitating connection with the piston cylinder 415 and the support rod 412. The sliding connection between the sliding collar 413 and the connecting frame 411 can be, for example, a shaft-hole fit or a linear bearing, ensuring low friction and smooth movement during swinging. Furthermore, the support rod 412 is slidably connected to the linear telescopic assembly via a sliding collar 419, which can swing relative to the horizontal line under external force, thereby adapting to vibration inputs in different directions and improving leveling adaptability. Among them, sliding collar one 413 and sliding collar two 419 are ring-shaped structures, preferably rectangular collars with rounded ends, and are connected to the connecting frame 411 through a suitable rotating shaft, allowing the support rod 412 to have a certain degree of freedom of deflection at the connection point.

[0045] For example, during operation, when the support frame 300 is subjected to horizontal vibration, the support frame 300 drives the connecting frame 411 to move, which in turn drives the support rod 412 to swing around the rotational connection point between it and the fixed frame 414 through the sliding collar 413. When the length of the support rod 412 on the side of the lever frame located on the connecting frame 411 is less than the length of the support rod 412 on the side of the lever frame located on the linear telescopic component, the lever frame forms lever arms of different lengths. According to the lever principle, the moving distance is proportional to the lever arm. The swing of the support rod 412 pushes the piston rod 416 to move linearly in the piston cylinder 415. The piston rod 416 will move a greater distance, causing the telescopic spring 417 to accumulate rebound force and squeeze the gas in the piston cylinder 415. The gas is slowly discharged through the small-diameter throttling hole 418, which will produce a damping effect, consume the thrust of the piston rod 416, absorb vibration energy, and thus slow down the moving speed of the piston rod 416. Meanwhile, the opposite transmission and movement path will occur at one or more linear telescopic components on the opposite side. Therefore, through the combined action of each set of lever frames and linear telescopic components, the vibration amplitude of the mounting platform 200 and the main body of the detector 100 can be significantly reduced, maintaining the stability of the detection process. In the lever structure, the lever arm lengths of the two ends of the support rod 412 from the fulcrum can be designed to be unequal according to the actual stiffness requirements. This allows the piston rod 416 to generate a larger damping stroke with a smaller support frame displacement, thus amplifying the buffering effect. Compared with conventional independently arranged vibration dampers, this lever-type linkage buffer mechanism can better coordinate the forces on multiple support points and prevent instability of the mounting platform 200.

[0046] Example 2

[0047] This embodiment is a further optimization based on Embodiment 1. For example... Figure 2 As shown, the adjustment mechanism 400 also includes a hydraulic component 42 disposed between the support frame 300 and the mounting platform 200.

[0048] like Figure 5 and Figure 6 As shown, the hydraulic assembly 42 includes a hydraulic cylinder 421 and a piston plate 422, with multiple linear telescopic components equidistantly distributed on the outer wall of the hydraulic cylinder 421. A piston rod 423 is mounted on the piston plate 422, extending out of the hydraulic cylinder 421 and connected to the support frame 300. A pressure spring 424 is fitted onto the portion of the piston rod 423 extending out of the hydraulic cylinder 421.

[0049] The hydraulic assembly 42 can absorb external force interference in the vertical direction. When the support frame 300 is subjected to longitudinal vibration, the piston column 423 moves relative to the hydraulic cylinder 421, compressing the pressure spring 424 and pushing the piston plate 422 to squeeze the liquid inside the hydraulic cylinder 421. The incompressibility and flow damping of the liquid achieve buffering, further ensuring the stability of the detector body 100 in the vertical direction. Conventional vertical vibration reduction often uses rigid support in conjunction with compression springs. Its disadvantage is that the linear stiffness characteristics of the spring have limited buffering when facing impact loads, and long-term load-bearing can easily lead to plastic deformation. This embodiment introduces a hydraulic chamber. The movement of the piston plate 422 forces hydraulic oil to flow through the gap between it and the inner wall of the hydraulic cylinder 421 or a specially designed damping hole (not shown in the figure), generating viscous damping. Combined with the elastic force of the pressure spring 424, it significantly improves the isolation effect against instantaneous impacts and continuous vibrations.

[0050] Example 3

[0051] like Figure 6 As shown, this embodiment adds a compression component 43 to the embodiment 2, which is used to pre-tighten the hydraulic component 42.

[0052] The extrusion assembly 43 includes an extrusion plate 431 sleeved on the piston post 423, and the extrusion plate 431 is provided with mounting holes adapted to the piston post 423. The extrusion plate 431 is located above the pressure spring 424 and can move axially along the piston post 423 under the action of the drive mechanism, thereby applying preload to the pressure spring 424.

[0053] The edge of the extrusion plate 431 has a bevel. The drive mechanism includes an extrusion block 432 adapted to the bevel of the extrusion plate 431. When the extrusion block 432 moves toward the extrusion plate 431, it pushes the extrusion plate 431 downward along the piston column 423 axially through the bevel engagement, compressing the pressure spring 424 and giving it pre-existing elastic potential energy, thereby providing stable support for the mounting platform 200. This embodiment uses a bevel conversion mechanism to convert the horizontal movement of the extrusion block 432 into the vertical movement of the extrusion plate 431. On the one hand, fine horizontal displacement control can be achieved using the threaded pair; on the other hand, the self-locking characteristic between the bevels can maintain positional stability after adjustment.

[0054] Specifically, when the support frame 300 moves upward due to vibration, it will cause the extrusion block 432 to rise. When the extrusion block 432 rises, its inclined surface will separate from the extrusion plate 431. At this time, the obstruction to the extrusion plate 431 disappears, and the pressure spring will release part of the rebound force, pushing the extrusion plate 431 to move axially along the piston column 423, and finally contacting the extrusion block 432 again, so that the extrusion plate 431 is blocked by the extrusion block 432 again. When the support frame rises, it will also compress the pressure spring to enhance its elastic potential energy, and finally make its elastic potential energy tend to stabilize again, stably supporting the mounting platform and the main body of the detector, effectively preventing the position of the main body of the detector from being affected when the support frame rises.

[0055] Furthermore, the drive mechanism also includes an extrusion frame 433 and an adjusting screw 434. The extrusion frame 433 can move in a direction perpendicular to the axis of the piston rod 423 under the rotation of the adjusting screw 434. The extrusion frame 433 is in contact with the extrusion block 432, or it can be an integral structure with the extrusion block 432. By rotating the adjusting screw 434, the position of the extrusion block 432 can be precisely controlled, thereby adjusting the preload of the pressure spring 424 to meet the stability requirements under different working conditions. The adjusting screw 434 can be a fine-pitch thread, which, in conjunction with a scale or dial, enables quantitative adjustment of the preload. The extrusion frame 433 can be equipped with a guide structure, such as cooperating with the guide rail on the support frame 300, to ensure accurate movement trajectory.

[0056] Through the synergistic effect of the leveling component 41, hydraulic component 42, and extrusion component 43, the laser tunnel cross-section detector of the present invention can effectively absorb and buffer external vibrations in multiple directions, ensuring that the detector body 100 maintains high precision and high stability during laser ranging, rotation scanning, and other operations. This allows for accurate acquisition of tunnel cross-section contour data and reliable determination of whether there is over-excavation or under-excavation of the tunnel cross-section. The overall system integrates multiple methods such as lever mechanical amplification, pneumatic damping, hydraulic damping, and adjustable pre-tensioning. Compared with traditional single vibration reduction methods, it has significant advantages in adaptability, stability, and ease of adjustment in complex construction vibration environments.

[0057] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

[0058] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0059] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

Claims

1. A laser tunnel cross-section detector, characterized in that, The device includes a main body (100) of a detector, a mounting platform (200) and a support frame (300). The main body (100) of the detector is connected to the mounting platform (200). The mounting platform (200) is mounted on the top of the support frame (300) via an adjustment mechanism (400). The adjustment mechanism (400) includes a leveling component (41), which includes: At least two linear telescopic components are distributed circumferentially at equal intervals on the bottom of the mounting platform (200); The connecting frame (411) is fixedly mounted on the support frame (300) corresponding to the linear telescopic component; The lever frame includes a support rod (412), a sliding collar (413), and a fixing frame (414). One end of the support rod (412) is slidably connected to the connecting frame (411) via the sliding collar (413), and the other end of the support rod (412) is connected to the linear telescopic assembly. The end of the support rod (412) away from the linear telescopic assembly extends toward the center of the mounting platform and is slidably connected to the connecting frame (411) via the sliding collar (413). The sliding collar (413) can swing relative to the vertical line of the support frame (300) under the action of an external force. The support rod (412) is slidably connected to the linear telescopic assembly via the sliding collar (419), and the sliding collar (419) can swing relative to the horizontal line under the action of an external force. One end of the fixing frame (414) is fixed to the outer wall of the linear telescopic assembly, and the other end of the fixing frame (414) is rotatably connected to the support rod (412).

2. The laser tunnel cross-section detector according to claim 1, characterized in that: The linear telescopic assembly includes a piston cylinder (415) and a piston rod (416). The outer wall of the piston cylinder (415) is connected to one end of the fixed frame (414). A telescopic spring (417) is sleeved on the part of the piston rod (416) that extends out of the piston cylinder (415). The piston rod (416) that extends out of the piston cylinder (415) is connected to the support rod (412).

3. The laser tunnel cross-section detector according to claim 2, characterized in that: The linear telescopic assembly is a pneumatic piston assembly, and each piston cylinder (415) has a throttling hole (418) on its inner wall.

4. The laser tunnel cross-section detector according to claim 1, characterized in that: The support rod (412) is an arc-shaped rod; the fixing frame (414) is an L-shaped rod.

5. The laser tunnel cross-section detector according to claim 1, characterized in that: The adjustment mechanism (400) further includes a hydraulic component (42) disposed between the support frame (300) and the mounting platform (200). The hydraulic component includes a hydraulic cylinder (421) and a piston plate (422). A plurality of linear telescopic components are equidistantly distributed on the outer wall of the hydraulic cylinder (421).

6. The laser tunnel cross-section detector according to claim 5, characterized in that: The piston plate (422) is provided with a piston rod (423), the piston rod (423) extends out of the hydraulic cylinder (421) and is connected to the support frame (300); the part of the piston rod (423) extending out of the hydraulic cylinder (421) is fitted with a pressure spring (424).

7. The laser tunnel cross-section detector according to claim 6, characterized in that: The adjusting mechanism (400) further includes a pressing assembly (43), which includes a pressing plate (431) sleeved on the piston column (423). The pressing plate (431) is provided with a mounting hole adapted to the piston column (423). The pressing plate (431) is located above the pressure spring (424) and can apply pressure to the pressure spring (424) under the action of the driving mechanism.

8. The laser tunnel cross-section detector according to claim 7, characterized in that: The edge of the extrusion plate (431) has a bevel, and the drive mechanism includes an extrusion block (432) adapted to the bevel of the extrusion plate (431). When the extrusion block (432) moves toward the extrusion plate (431), the extrusion plate (431) moves axially along the piston column (423) and extrudes the pressure spring (424).

9. The laser tunnel cross-section detector according to claim 8, characterized in that: The driving mechanism further includes an extrusion frame (433) and an adjusting screw (434). The extrusion frame (433) can move in a direction perpendicular to the axis of the piston rod (423) under the rotation of the adjusting screw (434). The extrusion frame (433) can drive the extrusion block (432) to move. The extrusion block (432) is in contact with the extrusion frame (433), or the extrusion block (432) and the extrusion frame (433) are an integral structure.

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