A rapid detection device for surface cracks in highway tunnel linings

Abstract

The present invention discloses a device for quickly detecting cracks on the lining surface of a highway tunnel, which is arranged on a vehicle body and comprises: an unfolding portion, a connecting mechanism is provided at the bottom of the unfolding portion, the connecting mechanism is fixedly connected to the vehicle body, and the vertical position of the unfolding portion is raised and lowered by the connecting mechanism, the unfolding portion comprises a bottom plate, the bottom plate is transmission-connected to the connecting mechanism, a driving mechanism is provided on the top surface of the bottom plate, and extension mechanisms are transmission-connected on both sides of the driving mechanism; a detecting portion, the detecting portion comprises a plurality of detecting mechanisms, a plurality of detecting mechanisms are respectively provided on two extending mechanisms, and the number of the detecting mechanisms respectively located on the side surfaces of the two extending mechanisms is equal, and the detecting ends of the detecting mechanisms are arranged as movable ends for position adjustment in the vertical direction; a limiting portion, the limiting portion is provided on the top of the driving mechanism, and the limiting portion abuts against the two extending mechanisms.

Description

Technical Field

[0001] The invention relates to the technical field of highway tunnel disease detection equipment, in particular to a device for quickly detecting cracks on the lining surface of a highway tunnel. Background Art

[0002] In recent years, with increased national investment in infrastructure, my country's transportation construction industry has experienced rapid growth, and the construction and research of highway tunnels, particularly long and large tunnels, have also seen rapid progress. However, because tunnels are semi-concealed structures constructed in underground rock and soil, and because tunnels in my country were built at different times, under varying geological conditions, and with varying technological levels, many tunnels have developed various defects after years of operation. These defects include deformation and limit encroachment, cracks, water seepage, misalignment, block fall, collapse, mud oozing from the base, subsidence, floor heave, and cavities behind the lining. These hazards pose a threat to tunnel operation safety, with cracks, water seepage, and cavities being the most common and serious tunnel defects.

[0003] Currently, crack detection in highway tunnels in my country primarily relies on manual on-site recording and marking of defects, followed by a manual mapping of the defects along the tunnel vault. This method requires significant manpower and resources, is highly risky, and requires specialized lifting equipment for tunnel vault inspection. Test results are highly subjective, with different inspectors producing varying results. Furthermore, safety assessments of tunnel lining structures are mostly qualitative. Although domestic and international research institutions have developed various types of tunnel defect inspection vehicles, these typically require road closures, significantly impacting traffic flow and resulting in low detection efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a device for quickly detecting cracks on the lining surface of a highway tunnel, so as to solve the problems existing in the prior art.

[0005] To achieve the above-mentioned object, the present invention provides the following solution: The present invention provides a device for quickly detecting cracks on the surface of a highway tunnel lining, which is arranged on a vehicle body and comprises:

[0006] The unfolding portion has a connecting mechanism provided at its bottom, the connecting mechanism being fixed to the vehicle body, and the vertical position of the unfolding portion being adjusted by the connecting mechanism. The unfolding portion includes a bottom plate, the bottom plate being in transmission connection with the connecting mechanism, the top surface of the bottom plate being provided with a driving mechanism, and both sides of the driving mechanism being in transmission connection with extension mechanisms;

[0007] A detection portion, the detection portion comprising a plurality of detection mechanisms, wherein the two extension mechanisms are respectively provided with the plurality of detection mechanisms, and the number of the plurality of detection mechanisms respectively located on the sides of the two extension mechanisms is equal, and the detection ends of the detection mechanisms are configured as movable ends that are adjusted in the vertical direction;

[0008] A limiting portion is provided at the top of the driving mechanism, and the limiting portion abuts against the two extending mechanisms.

[0009] Preferably, the detection mechanism includes a detection cylinder, the inner cross-section of the detection cylinder is set to a rectangular structure, the top surface of the detection cylinder is set to an open end, the bottom surface of the inner cavity of the detection cylinder is fixedly connected to a detection motor, the output end of the detection motor is fixedly connected to a detection screw, the inner wall of the detection cylinder is in sliding contact with a detection column, a detection hole is opened on the bottom surface of the detection column, the detection screw is connected to the inner wall of the detection hole by a thread, the top surface of the detection column is fixedly connected to a linear array camera, the linear array camera is set to the detection end, and lighting lamps are respectively fixed on both sides of the top surface of the detection column, and the two lighting lamps are respectively located on both sides of the linear array camera.

[0010] The top end of the driving cylinder is fixedly connected to the top surface of the bottom plate, and the bottom surface of the driving cylinder inner cavity is fixedly connected to the driving motor, and the opposite outer walls of the driving cylinder are respectively provided with a strip hole. The output end of the driving motor is fixedly connected to one end of the driving screw, and the other end of the driving screw is rotatably connected to the top surface of the inner cavity of the driving cylinder. A driving sleeve is provided on the inner wall of the driving cylinder for sliding contact with the inner wall of the driving cylinder. The driving sleeve is arranged on the outer wall of the driving screw, and the driving sleeve is connected to the driving screw by threaded connection. The two ends of the outer wall of the driving sleeve are respectively fixed with sliding seats, the two sliding seats extend from the two strip holes respectively, and the sliding seats are in sliding contact with the inner wall of the strip hole, the sliding seat is hinged with one end of a hinged rod from the protruding end of the strip hole, and the other end of the hinged rod is hinged to the middle of the bottom surface of the extension mechanism, the top of the driving cylinder is fixedly connected to the limiting cylinder, and the limiting part is arranged in the limiting cylinder.

[0011] Preferably, the extension mechanism includes an unfolding cylinder, which is arranged to be a rectangular structure, one end of the unfolding cylinder is hinged to the top side wall of the limiting cylinder, and the other end of the unfolding cylinder is fixedly connected to an extension motor, the output end of the extension motor passes through the unfolding cylinder and is fixedly connected to one end of an extension screw, the other end of the extension screw is rotatably connected to the inner wall of the unfolding cylinder, an extension hole is opened on the side of the unfolding cylinder, the extension screw is transmission-connected to an extension component, and the other end of the hinged rod is hinged to the bottom surface of the unfolding cylinder.

[0012] Preferably, the extension component includes an extension plate, the side wall of the extension plate is in sliding contact with the side wall of the expansion cylinder in which the extension hole is opened, an extension block is fixed to the side of the extension plate, the extension block passes through the extension hole and extends into the expansion cylinder, the outer wall of the extension block is in sliding contact with the inner wall of the expansion cylinder, the extension screw passes through the extension block, and the extension screw is connected to the extension block by a thread, and several of the detection cylinders are respectively fixed to the side surfaces of the extension plate and the expansion cylinder.

[0013] Preferably, the limiting portion includes a rotating cylinder, the outer wall of the rotating cylinder is in sliding contact with the inner wall of the limiting cylinder, a rotating motor is fixedly connected to the rotating cylinder, the output end of the rotating motor passes through the rotating cylinder and is fixedly connected to an abutment plate, L-shaped holes are respectively provided at two opposite ends of the outer wall of the limiting cylinder, the two ends of the abutment plate respectively pass through the two L-shaped holes, and the top surfaces of the two ends of the abutment plate are respectively abutted against the bottom surfaces of the two unfolding cylinders through an adjusting mechanism, and rubber layers are respectively provided at both ends of the top surface of the abutment plate.

[0014] Preferably, the adjustment mechanism includes a cylinder, the cylinder is fixed to the top surface of the limiting cylinder, and the output end of the cylinder passes through the top surface of the limiting cylinder and is fixed to the top surface of the rotating cylinder.

[0015] Preferably, the connecting mechanism includes a connecting plate, and a lifting motor is fixedly connected to both sides of the top surface of the connecting plate, and one end of the lifting screw is fixedly connected to the output end of the lifting motor. A lifting cylinder is fixedly connected to both sides of the top surface of the bottom plate, and the two lifting cylinders are respectively arranged corresponding to the two lifting screws. The other end of the lifting screw passes through the bottom plate and extends into the lifting cylinder, and the inner wall of the lifting cylinder is connected to the outer wall of the lifting screw by a thread.

[0016] The present invention discloses the following technical effects: the present invention is arranged on the vehicle body, and the detection device is deformed in advance before the vehicle body enters the tunnel. According to the design data of the tunnel provided by the management department, the extension length of the extension mechanism, the upward extension height of the plurality of detection mechanisms, and the lifting height of the connecting mechanism are adjusted so that the arc surface formed by the detection ends of the plurality of detection mechanisms is the same as the curvature of the tunnel lining layer. At the same time, the connecting mechanism is used to ensure that the spacing between the plurality of detection ends and the tunnel lining layer is equal. After the deformation adjustment is completed, the vehicle body directly enters the tunnel for detection without closing the road section, which greatly improves work efficiency. The driving mechanism is set to drive the extension mechanism to expand, increase the detection area, and improve adaptability. At the same time, the connecting mechanism, the extension mechanism and the driving mechanism are operated synchronously to realize overall expansion and contraction, reducing the occupied area. The set limit part can abut the extension mechanism after expansion, improve the stability of the extension mechanism after expansion and extension, and improve the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work.

[0018] Figure 1 This is a schematic structural diagram of a device for rapidly detecting surface cracks in a highway tunnel lining according to the present invention;

[0019] Figure 2 for Figure 1 A partial enlarged view of A1 in the middle;

[0020] Figure 3 This is a schematic diagram of the structure of the present invention when it is working;

[0021] Figure 4 for Figure 3 A partial enlarged view of A2 in the middle;

[0022] Figure 5 Schematic diagram of the structure of the extension mechanism of the present invention;

[0023] Figure 6 Schematic diagram of the structure of the detection mechanism of the present invention;

[0024] Figure 7 It is a structural schematic diagram of the limiting cylinder in the present invention.

[0025] Among them, 1. bottom plate; 2. detection cylinder; 3. detection motor; 4. detection screw; 5. detection column; 6. linear array camera; 7. lighting lamp; 8. driving cylinder; 9. driving motor; 10. strip hole; 11. driving screw; 12. driving sleeve; 13. sliding seat; 14. hinged rod; 15. limiting cylinder; 16. unfolding cylinder; 17. extension motor; 18. extension screw; 19. extension hole; 20. extension plate; 21. extension block; 22. rotating cylinder; 23. rotating motor; 24. abutment plate; 25. L-shaped hole; 26. cylinder; 27. connecting plate; 28. lifting motor; 29. ​​lifting cylinder; 30. lifting screw; 31. rubber layer. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Reference Figure 1-7 The present invention provides a device for quickly detecting cracks on the lining surface of a highway tunnel, which is arranged on a vehicle body and comprises:

[0029] The unfolding portion has a connecting mechanism at its bottom, which is fixed to the vehicle body. The vertical position of the unfolding portion is adjusted by the connecting mechanism. The unfolding portion includes a bottom plate 1, which is transmission-connected to the connecting mechanism. A driving mechanism is provided on the top surface of the bottom plate 1, and extension mechanisms are transmission-connected to both sides of the driving mechanism.

[0030] The detection part includes a plurality of detection mechanisms. The two extension mechanisms are respectively provided with a plurality of detection mechanisms, and the number of detection mechanisms located on the sides of the two extension mechanisms is equal. The detection ends of the detection mechanisms are configured as movable ends that can be adjusted in the vertical direction.

[0031] The limiting part is arranged on the top of the driving mechanism and abuts against the two extending mechanisms.

[0032] The present invention is arranged on the vehicle body. Before the vehicle body enters the tunnel, the detection device is deformed in advance. According to the tunnel design data provided by the management department, the extension length of the extension mechanism, the upward extension height of the plurality of detection mechanisms, and the lifting height of the connecting mechanism are adjusted so that the arc surface formed by the detection ends of the plurality of detection mechanisms has the same arc as the tunnel lining layer. At the same time, the connecting mechanism ensures that the spacing between the plurality of detection ends and the tunnel lining layer is equal. After the deformation adjustment is completed, the vehicle body directly enters the tunnel for detection without closing the road section, which greatly improves work efficiency. The driving mechanism is set to drive the extension mechanism to expand, increase the detection area, and improve adaptability. At the same time, the connecting mechanism, the extension mechanism and the driving mechanism are synchronously operated to realize overall expansion and contraction, reducing the occupied area. The limiting portion is set to abut the extension mechanism after expansion, thereby improving the stability of the extension mechanism after expansion and extension, and improving the detection accuracy.

[0033] The line scan camera 6 operates as follows: First, the top-mounted line scan camera 6 needs to be connected to the control module. Encoders are also installed on the wheels to determine the vehicle's speed. A photo interval is calculated to ensure a comprehensive image. This can be based on the vehicle's speed and the tunnel length. To ensure that every point is captured, the photo interval is set to a ratio of the tunnel length to the resolution of the line scan camera 6, meaning that each pixel (or region of multiple pixels) is captured at least once. Code is written in the control module to ensure that the line scan camera 6 captures images at the appropriate times. The control module should poll the encoder and calculate the speed, calculate the photo interval based on the speed, and trigger the camera to capture at the appropriate time. It can also automatically adjust the photo interval if the speed changes. Finally, image processing techniques are used to merge all captured images into a complete image. A simple approach is to stitch all images column by column and add the result to a "large image." As the vehicle moves through the tunnel, a complete image of the top lining is obtained, which can be used to inspect for wear, maintenance, and other issues.

[0034] The control method between the encoder and the line scan camera 6 can be divided into two parts:

[0035] The control mechanism between the encoder and the control module: As the vehicle moves, the encoder rotates and outputs a corresponding pulse signal. The encoder outputs the number of pulses per revolution, and the control module reads the encoder pulse signal and calculates the vehicle's speed. The control module can use a timer or polling method to read the encoder signal. After a certain number of pulses (for example, 10) are received, the speed is calculated based on the acquisition time.

[0036] Control between the control module and the line scan camera 6: After determining the image capture interval, the control module can generate a trigger signal and transmit it to the line scan camera 6. This trigger signal can be implemented via a hardware GPIO port or software-based methods such as serial communication. Upon receiving the trigger signal, the line scan camera 6 begins capturing images and outputs digital image data. This data can then be transmitted to the control module for processing.

[0037] Therefore, in the entire control process, the encoder is responsible for measuring vehicle speed, while the line scan camera 6 is responsible for capturing images according to the shooting interval. The control module plays a coordinating role, calculating the shooting interval based on the speed and transmitting the trigger signal to the line scan camera 6 at the appropriate time. This realizes the image acquisition function of the line scan camera 6 controlled by the encoder.

[0038] To further optimize the solution, the detection mechanism includes a detection cylinder 2, the inner cross-section of the detection cylinder 2 is set to a rectangular structure, the top surface of the detection cylinder 2 is set to an open end, the bottom surface of the inner cavity of the detection cylinder 2 is fixedly connected to a detection motor 3, the output end of the detection motor 3 is fixedly connected to a detection screw 4, the inner wall of the detection cylinder 2 is in sliding contact with a detection column 5, the bottom surface of the detection column 5 is provided with a detection hole, the detection screw 4 is connected to the inner wall of the detection hole by a thread, the top surface of the detection column 5 is fixedly connected to a linear array camera 6, the linear array camera 6 is set to a detection end, and lighting lamps 7 are respectively fixed on both sides of the top surface of the detection column 5, and the two lighting lamps 7 are respectively located on both sides of the linear array camera 6.

[0039] The detection motor 3 drives the detection screw 4 to rotate. Under the limiting action of the inner wall of the detection tube 2, the detection column 5 extends upward. The extension length of each detection column 5 is adjusted to make the line array camera 6 form an arc to adapt to the curvature of the top of the tunnel lining layer, and the photo is taken after the lighting is supplemented by the lighting lamp 7.

[0040] A further optimized solution is provided, the driving mechanism includes a driving cylinder 8, the bottom of the driving cylinder 8 is fixed to the top surface of the base plate 1, the bottom surface of the inner cavity of the driving cylinder 8 is fixed with a driving motor 9, and the opposite outer walls of the driving cylinder 8 are respectively provided with strip holes 10, the output end of the driving motor 9 is fixed with one end of a driving screw 11, and the other end of the driving screw 11 is rotatably connected to the inner cavity top surface of the driving cylinder 8, the inner wall of the driving cylinder 8 is in sliding contact with a driving sleeve 12, the driving sleeve 12 is sleeved on the outer wall of the driving screw 11, and the driving sleeve 12 is connected to the driving screw 11 by a thread, and the outer wall ends of the driving sleeve 12 are respectively fixed with sliding seats 13, the two sliding seats 13 extend from the two strip holes 10 respectively, and the sliding seats 13 are in sliding contact with the inner walls of the strip holes 10, the sliding seat 13 is hinged to one end of a hinged rod 14 from the protruding end of the strip hole 10, and the other end of the hinged rod 14 is hinged to the middle of the bottom surface of the extension mechanism, the top of the driving cylinder 8 is fixed with a limiting cylinder 15, and the limiting part is arranged in the limiting cylinder 15.

[0041] The driving motor 9 drives the driving screw 11 to rotate, and the two sliding seats 13 cooperate with the strip holes 10 to limit the driving sleeve 12 so that it can be raised and lowered, and then cooperate with the hinge rod 14 to realize the expansion action of the extension mechanism.

[0042] To further optimize the solution, the extension mechanism includes an unfolding cylinder 16, which is arranged to be a rectangular structure. One end of the unfolding cylinder 16 is hinged to the top side wall of the limiting cylinder 15, and the other end of the unfolding cylinder 16 is fixedly connected to an extension motor 17. The output end of the extension motor 17 passes through the unfolding cylinder 16 and is fixedly connected to one end of an extension screw 18. The other end of the extension screw 18 is rotatably connected to the inner wall of the unfolding cylinder 16. An extension hole 19 is opened on the side of the unfolding cylinder 16, and the extension screw 18 is transmission-connected to an extension component. The other end of the hinged rod 14 is hinged to the bottom surface of the unfolding cylinder 16.

[0043] The provided extension motor 17 drives the extension screw 18 to rotate, thereby extending the extension assembly so that the length of the entire extension mechanism is adapted to the width of the tunnel lining layer to be inspected.

[0044] A further optimization solution is provided, in which the extension component includes an extension plate 20, the side wall of the extension plate 20 is in sliding contact with the side wall of the unfolding tube 16 in which the extension hole 19 is opened, an extension block 21 is fixedly connected to the side of the extension plate 20, the extension block 21 passes through the extension hole 19 and extends into the unfolding tube 16, the outer wall of the extension block 21 is in sliding contact with the inner wall of the unfolding tube 16, the extension screw 18 passes through the extension block 21, and the extension screw 18 is connected to the extension block 21 by a threaded connection, and several detection tubes 2 are respectively fixed to the sides of the extension plate 20 and the unfolding tube 16.

[0045] A further optimized solution is provided, in which the limiting portion includes a rotating cylinder 22, the outer wall of the rotating cylinder 22 is in sliding contact with the inner wall of the limiting cylinder 15, a rotating motor 23 is fixedly connected to the rotating cylinder 22, and the output end of the rotating motor 23 passes through the rotating cylinder 22 and is fixedly connected to a contact plate 24, L-shaped holes 25 are respectively provided at two opposite ends of the outer wall of the limiting cylinder 15, and two ends of the contact plate 24 respectively pass through the two L-shaped holes 25, and the top surfaces of the two ends of the contact plate 24 are respectively contacted with the bottom surfaces of the two unfolding cylinders 16 through an adjusting mechanism, and rubber layers 31 are respectively provided at both ends of the top surface of the contact plate 24.

[0046] The abutment plate 24 is arranged in a perpendicular state to the two extension mechanisms when the entire device is in a retracted state. After the extension mechanisms are unfolded, the rotating motor 23 drives the abutment plate 24 to rotate along the bottom opening of the L-shaped hole 25 so that it is arranged parallel to the two extension mechanisms. The abutment plate 24 is then lifted upward by the cylinder 26 so that its rubber layer 31 abuts against the bottom surface of the unfolding tube 16, thereby achieving further reinforcement and stabilization of the unfolding tube 16.

[0047] According to a further optimized solution, the adjustment mechanism includes a cylinder 26 , which is fixed to the top surface of the limiting cylinder 15 , and an output end of the cylinder 26 passes through the top surface of the limiting cylinder 15 and is fixed to the top surface of the rotating cylinder 22 .

[0048] To further optimize the solution, the connecting mechanism includes a connecting plate 27, and a lifting motor 28 is fixedly connected to both sides of the top surface of the connecting plate 27, and one end of the lifting screw 30 is fixed to the output end of the lifting motor 28. A lifting cylinder 29 is fixedly connected to both sides of the top surface of the base plate 1, and the two lifting cylinders 29 are respectively arranged corresponding to the two lifting screws 30. The other end of the lifting screw 30 passes through the base plate 1 and extends into the lifting cylinder 29, and the inner wall of the lifting cylinder 29 is connected to the outer wall of the lifting screw 30 by a thread.

[0049] The two lifting motors 28 can drive the bottom plate 1 to move up and down, thereby adjusting the distance between the linear array camera 6 and the top surface of the lining layer.

[0050] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0051] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A fast detection device for cracks on the lining surface of a highway tunnel, mounted on a vehicle body, characterized in that: include: An unfolding portion, wherein a connecting mechanism is provided at the bottom of the unfolding portion, the connecting mechanism is fixedly connected to the vehicle body, and the vertical position of the unfolding portion is adjusted by the connecting mechanism. The unfolding portion comprises a bottom plate (1), the bottom plate (1) is in transmission connection with the connecting mechanism, a driving mechanism is provided on the top surface of the bottom plate (1), and both sides of the driving mechanism are respectively in transmission connection with extension mechanisms; A detection portion, the detection portion comprising a plurality of detection mechanisms, wherein the two extension mechanisms are respectively provided with the plurality of detection mechanisms, and the number of the plurality of detection mechanisms respectively located on the sides of the two extension mechanisms is equal, and the detection ends of the detection mechanisms are configured as movable ends that are adjusted in the vertical direction; a limiting portion, the limiting portion being arranged on the top of the driving mechanism and abutting against the two extending mechanisms; The detection mechanism comprises a detection cylinder (2), the inner cavity cross-section of the detection cylinder (2) is set as a rectangular structure, the top surface of the detection cylinder (2) is set as an open end, the bottom surface of the inner cavity of the detection cylinder (2) is fixedly connected to a detection motor (3), the output end of the detection motor (3) is fixedly connected to a detection screw (4), the inner wall of the detection cylinder (2) is in sliding contact with a detection column (5), the bottom surface of the detection column (5) is provided with a detection hole, the detection screw (4) is connected to the inner wall of the detection hole by a thread, the top surface of the detection column (5) is fixedly connected to a linear array camera (6), the linear array camera (6) is set as the detection end, and lighting lamps (7) are respectively fixedly connected to both sides of the top surface of the detection column (5), and the two lighting lamps (7) are respectively located on both sides of the linear array camera (6); The driving mechanism comprises a driving cylinder (8), the bottom of the driving cylinder (8) is fixed to the top surface of the bottom plate (1), a driving motor (9) is fixed to the bottom surface of the inner cavity of the driving cylinder (8), and strip holes (10) are respectively opened on the opposite outer walls of the driving cylinder (8), the output end of the driving motor (9) is fixed to one end of a driving screw (11), and the other end of the driving screw (11) is rotatably connected to the top surface of the inner cavity of the driving cylinder (8), and a driving sleeve (12) is in sliding contact with the inner wall of the driving cylinder (8), and the driving sleeve (12) is sleeved on the outer wall of the driving screw (11), and the driving sleeve ( 12) is connected to the driving screw rod (11) by a threaded connection, and the two ends of the outer wall of the driving sleeve (12) are fixed with sliding seats (13), and the two sliding seats (13) respectively extend from the two strip holes (10), and the sliding seats (13) are in sliding contact with the inner wall of the strip hole (10), and the sliding seat (13) is hinged to one end of a hinged rod (14) from the extended end of the strip hole (10), and the other end of the hinged rod (14) is hinged to the middle part of the bottom surface of the extension mechanism, and the top of the driving cylinder (8) is fixed with a limiting cylinder (15), and the limiting portion is arranged in the limiting cylinder (15); The extension mechanism includes an expansion cylinder (16), the expansion cylinder (16) is configured as a rectangular structure, one end of the expansion cylinder (16) is hinged to the top side wall of the limiting cylinder (15), the other end of the expansion cylinder (16) is fixedly connected to an extension motor (17), the output end of the extension motor (17) passes through the expansion cylinder (16) and is fixedly connected to one end of an extension screw (18), the other end of the extension screw (18) is rotatably connected to the inner wall of the expansion cylinder (16), an extension hole (19) is provided on the side of the expansion cylinder (16), the extension screw (18) is transmission-connected to an extension component, and the other end of the hinged rod (14) is hinged to the bottom surface of the expansion cylinder (16); The extension assembly includes an extension plate (20), the side wall of the extension plate (20) is in sliding contact with the side wall of the expansion cylinder (16) having the extension hole (19), an extension block (21) is fixedly connected to the side of the extension plate (20), the extension block (21) passes through the extension hole (19) and extends into the expansion cylinder (16), the outer wall of the extension block (21) is in sliding contact with the inner wall of the expansion cylinder (16), the extension screw (18) passes through the extension block (21), and the extension screw (18) is connected to the extension block (21) by a thread, and a plurality of the detection cylinders (2) are respectively fixed to the side of the extension plate (20) and the side of the expansion cylinder (16); The connecting mechanism includes a connecting plate (27), and a lifting motor (28) is fixedly connected to both sides of the top surface of the connecting plate (27), and an output end of the lifting motor (28) is fixedly connected to one end of a lifting screw (30). A lifting cylinder (29) is fixedly connected to both sides of the top surface of the bottom plate (1), and the two lifting cylinders (29) are respectively arranged corresponding to the two lifting screws (30). The other end of the lifting screw (30) passes through the bottom plate (1) and extends into the lifting cylinder (29), and the inner wall of the lifting cylinder (29) is connected to the outer wall of the lifting screw (30) by a thread.

2. The device for rapid detection of cracks on the lining surface of a highway tunnel according to claim 1, characterized in that: The limiting portion includes a rotating cylinder (22), the outer wall of the rotating cylinder (22) is in sliding contact with the inner wall of the limiting cylinder (15), a rotating motor (23) is fixedly connected to the rotating cylinder (22), the output end of the rotating motor (23) passes through the rotating cylinder (22) and is fixedly connected to an abutment plate (24), L-shaped holes (25) are respectively opened at two opposite ends of the outer wall of the limiting cylinder (15), the two ends of the abutment plate (24) respectively pass through the two L-shaped holes (25), and the top surfaces of the two ends of the abutment plate (24) are respectively abutted against the bottom surfaces of the two unfolding cylinders (16) through an adjustment mechanism, and the two ends of the top surface of the abutment plate (24) are respectively provided with rubber layers (31).

3. The device for rapid detection of cracks on the lining surface of a highway tunnel according to claim 2, characterized in that: The regulating mechanism comprises a cylinder (26), the cylinder (26) is fixedly connected to the top surface of the limiting cylinder (15), and the output end of the cylinder (26) passes through the top surface of the limiting cylinder (15) and is fixedly connected to the top surface of the rotating cylinder (22).

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