A tunnel roof cracking safety detection device

Abstract

The application is a kind of tunnel top cracking safety detection device, relating to the technical field of tunnel detection equipment, comprising an arc-adapted arched frame and an arc-shaped sliding block. The arc-shaped sliding block is arranged along the upper arc of the arched frame. The arched frame as a whole is a large-scale assembly equipment, which is convenient for disassembly, assembly and transportation of the arched frame. The support structure of the arched frame is stable, and a large arched opening is arranged below the middle of the arched frame, so that other vehicles or personnel can pass through conveniently during the detection work, and the influence on the passing is reduced. Through the cooperation of the arc-shaped sliding block and the movable conveying assembly, the detection angle of the concrete detector can be adjusted in a large range along the arched frame. Moreover, the extension and retraction control of the movable conveying assembly and the two sides of the movable telescopic rod can synchronously control the orientation or height of the rubber conveyor belt, so that the arc of the rubber conveyor belt can better correspond and adapt to the arc of the inner side of the tunnel. In this way, the transportation of the concrete detector is more flexible and effective during the close-to-surface transportation detection.

Description

Technical Field

[0001] This invention relates to the field of tunnel inspection equipment technology, specifically a safety inspection device for cracks in the roof of a tunnel. Background Technology

[0002] Cracks in tunnel lining concrete are one of the core defects threatening tunnel structural safety. Most tunnel walls are arched, and existing detection equipment relies heavily on large engineering vehicles equipped with lifting platforms, ground-penetrating radar, ultrasonic detectors, and other devices, resulting in a bulky overall structure. When operating within the confined space of a tunnel, this not only obstructs normal traffic but also limits turning radius, making it particularly unsuitable for narrow tunnels. While some solutions utilize mobile trolleys, these are fixed to the detection components, leading to inefficient transportation and disassembly. Furthermore, traditional detection probes (such as ultrasonic sensors and ground-penetrating radar) are typically directly attached to the tunnel wall via rigid supports. However, the tunnel arch often has uneven surfaces, and rigid contact prevents the probe from adapting to surface changes. This rigidity causes wear and tear, leading to fluctuations in detection distance, blurred images, and even missed cracks. Additionally, existing supports have limited curvature adjustment ranges for different tunnel cross-sections (such as circular arcs and horseshoe shapes), hindering multi-functionality. Therefore, a tunnel roof crack safety detection device is urgently needed to address these issues. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the purpose of this invention is to provide a safety detection device for cracks in the top of tunnels, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution: a tunnel top crack safety detection device, comprising an arched frame with an adapted curvature and an arc-shaped sliding block, wherein the arc-shaped sliding block is slidably arranged along the upper side of the arched frame, and a movable conveying component is movably attached to the upper side of the arc-shaped sliding block, wherein a concrete detector is elastically and movably arranged in the middle of the upper side of the movable conveying component, so that the concrete detector is elastically pressed and movably adapted to contact the top of the tunnel;

[0005] The movable conveying assembly is connected to the concrete detector by an elastic movable group, which is used to apply secondary elastic force to the concrete detector and allow the concrete detector to rotate left and right.

[0006] A drive structure for driving the arc-shaped sliding block to slide along the upper arc of the arch frame is installed on the lower side of the middle part of the arch frame;

[0007] The arc-shaped sliding block is rotatably mounted with movable telescopic rods at its four corners, and the telescopic ends of the movable telescopic rods are movably connected to the four corners of the bottom of the movable conveying component, which are used to control the lifting height and tilt angle of the movable conveying component and the concrete detector.

[0008] The movable conveying assembly includes two arc-shaped frame plates arranged at the front and rear. The left and right sides of the two arc-shaped frame plates are rotatably mounted with a first rotating shaft and a second rotating shaft to form an integral structure. One of the arc-shaped frame plates is equipped with a conveying motor for driving the rotation of the first rotating shaft and the second rotating shaft. The telescopic end of the movable telescopic rod is movably connected to the two ends of the bottom of the arc-shaped frame plate.

[0009] A rubber conveyor belt is fitted between the first and second rotating shafts, and the two sides of the rubber conveyor belt are arranged in an arc shape along the middle of the two arc-shaped frame plates. Several roller pressing groups are arranged on the inner side of the two arc-shaped frame plates, and the two sides of the rubber conveyor belt are positioned by rolling and pressing the roller pressing groups.

[0010] Preferably, the roller pressing assembly includes a connecting rod vertically fixed to the inner side of the arc-shaped frame plate, and the connecting rod is longitudinally rotatably mounted with two spaced pressure rollers. The two pressure rollers are respectively clamped and rolled on the upper and lower surfaces of the side edge of the rubber conveyor belt, and both the pressure rollers and the surface of the rubber conveyor belt are provided with anti-slip stripes.

[0011] Preferably, the rubber conveyor belt has outwardly raised protrusions integrally provided on both the front and rear sides, and the protrusions are engaged with the outer edges of the two pressure rollers.

[0012] Preferably, the top surface of the arc-shaped sliding block has four mounting grooves at its four corners, and each of the movable telescopic rods is rotatably installed in the mounting groove. When each movable telescopic rod is fully retracted, it rotates and retracts into the mounting groove, while the top of the arc-shaped sliding block is adapted to support and contact the bottom of the arc-shaped frame plate.

[0013] Preferably, the drive structure includes a transmission motor installed on the lower side of the middle part of the arched frame. The transmission motor shaft is equipped with a drive gear, and the middle part of the arched frame has an opening to accommodate the rotation of the drive gear. Two or more arc-shaped guide rods are fixedly installed on the upper side of the arched frame. The bottom of the arc-shaped sliding block has an arc-shaped groove that is adapted to slide with the arc-shaped guide rods, and an arc-shaped rack is installed at the bottom of the arc-shaped sliding block. The arc-shaped rack meshes with the drive gear for transmission.

[0014] Preferably, movable lifting assemblies are installed on both sides of the bottom of the arched frame. The movable lifting assemblies include multiple vertical telescopic rods and support plates installed at the telescopic ends of the vertical telescopic rods. Universal locking wheels are installed at the bottom of the support plates.

[0015] Preferably, the arch frame is equipped with lateral telescopic rods on both the left and right sides, which are used to fix and correct the position of the arch frame by pressing against both sides of the tunnel.

[0016] Preferably, the arched frame is formed by bolting together a first arc-shaped piece and a second arc-shaped piece that are mirror images of each other. The first arc-shaped piece and the second arc-shaped piece are provided with slots and inserts on their opposite contact surfaces to lock them together. The drive motor is installed between the first arc-shaped piece and the second arc-shaped piece by screws, and the movable lifting assembly is respectively located at the bottom of the first arc-shaped piece and the second arc-shaped piece.

[0017] Preferably, the elastic movable assembly includes a base plate and a top plate. The base plate is locked to the upper side of the rubber conveyor belt by screws or bolts. The top plate is used to install a concrete testing instrument. Two tubes are installed on the upper side of the base plate, and ball joints are slidably and vertically arranged inside the tubes. Two ball bearings are installed at the bottom of the top plate to connect with the ball joints for left and right flipping.

[0018] Preferably, a support spring is fitted on the ball joint, and the support spring is located between the ball bearing and the tube to provide elastic support.

[0019] By adopting the above technical solution, the present invention has the following advantages:

[0020] The invention has an ingenious structure. The arched frame is a large assembly device, which facilitates the disassembly, assembly, and transportation of the arched frame during use. The supporting structure of the assembled arched frame is stable, and there is a large arched opening in the lower middle part of the arched frame. Therefore, it can facilitate the passage of other vehicles or personnel during the inspection work, which can reduce the impact on passage.

[0021] With the cooperation of the arc-shaped sliding block and the movable conveying assembly, the detection angle of the concrete detector can be adjusted over a wide range along the arched frame. Moreover, the movable conveying assembly, in conjunction with the extension and retraction control of the movable telescopic rods on both sides, can synchronously control the orientation or height of the rubber conveyor belt, allowing the curvature of the rubber conveyor belt to better correspond to and adapt to the curvature of the tunnel interior. This makes the conveying of the concrete detector more flexible and effective during close-fitting detection. At the same time, the rubber conveyor belt of the movable conveying assembly gives the concrete detector an elastic detection effect, allowing the concrete detector to elastically press against and dynamically adapt to contact with the top of the tunnel. While elastically pressing against the top of the tunnel, it can also perform two-stage conveying detection in an arc path, which can reduce the hard contact between the concrete detector and the bottom of the tunnel. The roller pressing group enhances the arc support and guiding positioning of the rubber conveyor belt, making it more stable during arc-shaped conveying.

[0022] Based on the primary elastic conveying support of the rubber conveyor belt of the aforementioned movable conveying component, an elastic movable group is set up to provide secondary elastic support for the concrete detector, allowing the concrete detector to rotate left and right to adapt to different concave and convex surfaces of the tunnel wall, greatly improving the flexibility, applicability, and service life of the concrete detector.

[0023] Movable lifting units are installed on both sides of the bottom of the arch frame, which can adjust the height of the entire arch frame to match tunnels of different heights. The side telescopic rods are used to strengthen the fixing effect and position correction of the arch frame in the tunnel, so that the above-mentioned detection structure can be used more flexibly and stably. Attached Figure Description

[0024] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0025] Figure 1 This is a schematic diagram of the structure of the present invention;

[0026] Figure 2 For the present invention Figure 1 A structural diagram from another perspective;

[0027] Figure 3 This is a schematic diagram of the disassembled structure of the arched frame of the present invention;

[0028] Figure 4 This is a schematic diagram of the arc-shaped sliding block and the movable conveying assembly of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of the active conveying component of the present invention;

[0030] Figure 6 This is a schematic diagram of the structure of the roller pressing assembly and the rubber conveyor belt of the present invention;

[0031] Figure 7 For the present invention Figure 6 Another perspective structural diagram;

[0032] Figure 8 This is a schematic diagram of the structure of the elastic movable assembly and concrete testing instrument of the present invention;

[0033] Figure 9 This is a schematic diagram of the structure of the side telescopic rod of the present invention;

[0034] Figure 10 This is a schematic diagram illustrating the usage state of the present invention;

[0035] In the diagram: 1. Arched frame; 10. Arc-shaped guide rod; 11. First arc-shaped piece; 12. Second arc-shaped piece; 13. Slot; 14. Insert block; 15. Through port; 16. Drive motor; 17. Drive gear; 18. Side telescopic rod; 2. Arc-shaped sliding block; 20. Mounting groove; 21. Movable telescopic rod; 22. Arc-shaped slide groove; 23. Arc-shaped rack; 3. Movable conveyor assembly; 31. Arc-shaped frame plate; 32. Rubber conveyor belt; 321. Protrusion; 33. First rotating shaft; 34. Second rotating shaft; 35. Roller assembly; 35. Connecting rod; 351. Pressure roller; 352. Conveyor motor; 36. Concrete detector; 4. Elastic movable assembly; 5. Base plate; 51. Cylindrical tube; 52. Ball head rod; 53. Support spring; 54. Top plate; 55. Ball bearing; 56. Movable lifting assembly; 6. Vertical telescopic rod; 61. Support plate; 62. Universal locking wheel; 63. Detailed Implementation

[0036] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0037] like Figure 1-10As shown, this invention provides a safety detection device for cracks in the tunnel roof, including an arched frame 1 with an adapted curvature and an arc-shaped sliding block 2. The arc-shaped sliding block 2 is slidably arranged along the upper side of the arched frame 1. A movable conveying component 3 is movably attached to the upper side of the arc-shaped sliding block 2. A concrete detector 4 is elastically and movably mounted on the upper center of the movable conveying component 3, so that the concrete detector 4 is elastically pressed against and movably adapted to contact the tunnel roof. The arched frame 1 has a channel at the bottom to facilitate passage during detection without occupying space. With the cooperation of the arc-shaped sliding block 2 and the movable conveying component 3, the detection angle and position of the concrete detector 4 can be adjusted over a wide range, and the concrete detector can also be... 4. This creates an adaptive elastic effect that fits snugly against the tunnel wall, allowing the concrete detector 4 to be transported and tested along the path. An elastic movable group 5 connects the movable conveying component 3 to the concrete detector 4. This elastic movable group 5 provides secondary elastic support to the concrete detector 4 and allows it to rotate left and right. Based on the primary elastic conveying support of the movable conveying component 3, the elastic movable group 5 provides secondary elastic support to the concrete detector 4, allowing it to rotate left and right to adapt to the curvature and unevenness of the tunnel interior. Movable telescopic rods 21 are rotatably mounted on the four corners of the arc-shaped sliding block 2, and the telescopic ends of the movable telescopic rods 21 are... The movable conveyor assembly 3 is movably connected to the four corners of its bottom, and is used to control the lifting height and tilt angle of the movable conveyor assembly 3 and the concrete detector 4. The movable conveyor assembly 3 includes two arc-shaped frame plates 31 arranged at the front and rear. The left and right sides of the two arc-shaped frame plates 31 are rotatably mounted with a first rotating shaft 33 and a second rotating shaft 34, forming an integral structure. One of the arc-shaped frame plates 31 is equipped with a conveyor motor 36 for driving the rotation of the first rotating shaft 33 and the second rotating shaft 34. The telescopic end of the movable telescopic rod 21 is movably connected to the two ends of the bottom of the arc-shaped frame plate 31. A rubber conveyor belt 32 is sleeved between the first rotating shaft 33 and the second rotating shaft 34, and the edges of the rubber conveyor belt 32 are along the sides. The two arc-shaped frame plates 31 are arranged in an arc shape in the middle. The elasticity of the rubber conveyor belt 32 provides primary elastic support for the concrete detector 4 and also serves as a secondary conveyor. When the concrete detector 4 is being conveyed for testing, the rubber conveyor belt 32 is concave downwards under force, giving the concrete detector 4 an upward elastic clamping force. This prevents the concrete detector 4 from making hard contact with the tunnel surface and causing equipment wear. Combined with the extension and retraction of the movable telescopic rods 21 on both sides, the orientation or height of the rubber conveyor belt 32 can be controlled synchronously, allowing it to better correspond to and adapt to the curvature of the inner side of the tunnel. This makes the conveying of the concrete detector 4 for contact testing more flexible and effective.

[0038] In the above technical solution, several roller pressing groups 35 are arranged on the inner side of the two arc-shaped frame plates 31. The roller pressing groups 35 are distributed along the arc of the rubber conveyor belt 32 and are positioned by rolling and pressing the two sides of the rubber conveyor belt 32. The roller pressing group 35 includes a connecting rod 351 vertically fixed to the inner side of the arc-shaped frame plate 31, and two spaced pressure rollers 352 are longitudinally rotatably installed on the connecting rod 351. The two pressure rollers 352 respectively clamp and roll on the upper and lower surfaces of the side edges of the rubber conveyor belt 32. The pressure rollers 352 and the surface of the rubber conveyor belt 32 are both provided with anti-slip stripes, which can improve the stable support and guiding positioning of the two sides of the rubber conveyor belt 32 when the rubber conveyor belt 32 is conveying the concrete detector 4 in an arc shape, and improve the stability of use.

[0039] Furthermore, the rubber conveyor belt 32 has outwardly raised protrusions 321 integrally provided on both the front and rear sides, and the protrusions 321 are engaged on the outer edges of the two pressure rollers 352. When the rubber conveyor belt 32 is subjected to force, the protrusions 321 are engaged on the two pressure rollers 352, further preventing detachment and improving the stability of the arc conveying and primary elastic support of the rubber conveyor belt 32.

[0040] In this embodiment, mounting grooves 20 are respectively provided at the four corners of the top surface of the arc-shaped sliding block 2, and each movable telescopic rod 21 is rotatably installed in the mounting groove 20. When each movable telescopic rod 21 is fully retracted, it rotates and retracts into the mounting groove 20. The top of the arc-shaped sliding block 2 is adapted to support and contact the bottom of the arc-shaped frame plate 31. Through this reasonable spatial layout, the arc-shaped frame plate 31 and the arc-shaped sliding block 2 are more adapted to each other. In this state, the use or transportation of the movable conveying component 3 is more stable.

[0041] In this embodiment, a drive structure for driving the arc-shaped sliding block 2 to slide along the upper arc of the arch frame 1 is installed on the lower side of the middle part of the arch frame 1. The drive structure includes a transmission motor 16 installed on the lower side of the middle part of the arch frame 1. The shaft of the transmission motor 16 is equipped with a drive gear 17, and the middle part of the arch frame 1 has an opening 15 to accommodate the rotation of the drive gear 17. Two or more arc-shaped guide rods 10 are fixedly installed on the upper side of the arch frame 1. The bottom of the arc-shaped sliding block 2 has an arc-shaped groove 22 that is adapted to slide with the arc-shaped guide rods 10, and an arc-shaped rack 23 is installed at the bottom of the arc-shaped sliding block 2. The arc-shaped rack 23 meshes with the drive gear 17 for transmission. Therefore, the transmission motor 16 drives the drive gear 17, and the drive gear 17 meshes with the arc-shaped rack 23 for transmission. Through this simple and ingenious transmission structure, the arc-shaped sliding block 2 can be driven to slide back and forth in a wide range along the arc direction to correspond to the top inner wall of different positions of the tunnel. When used in conjunction with the movable conveying component 3, it can make the concrete detector 4 have a larger adjustment range and be more flexible and applicable.

[0042] The arch frame 1 has movable lifting assemblies 6 installed on both sides of its bottom. Each movable lifting assembly 6 includes two vertical telescopic rods 61 and a support plate 62 installed at the telescopic end of the vertical telescopic rods 61. The bottom of the support plate 62 is equipped with universal locking wheels 63 to facilitate displacement. The telescopic extension and retraction of the vertical telescopic rods 61 can adjust the arch frame 1 to different heights, making it more convenient and flexible to use. Furthermore, side telescopic rods 18 are installed laterally on the left and right sides of the arch frame 1 to tighten against the sides of the tunnel to fix and correct the position of the arch frame 1, thereby enhancing the fixation effect of the arch frame 1 in the tunnel and correcting its position.

[0043] In this embodiment, the arch frame 1 is formed by bolting together a first arc-shaped piece 11 and a second arc-shaped piece 12 that are mirror images of each other, so as to facilitate the disassembly, assembly and transportation of the arch frame 1. The movable lifting assembly 6 is respectively set at the bottom of the first arc-shaped piece 11 and the second arc-shaped piece 12. The first arc-shaped piece 11 and the second arc-shaped piece 12 are provided with slots 13 and inserts 14 on their opposite contact surfaces, which are interlocked with each other. This improves the structural strength of the first arc-shaped piece 11 and the second arc-shaped piece 12 under the interlocking action of the slots 13 and the inserts 14, and makes them less likely to separate. The drive motor 16 is installed between the first arc-shaped piece 11 and the second arc-shaped piece 12 by screws, which improves the connection stability of the assembled arch frame 1.

[0044] In this embodiment, the elastic movable group 5 includes a base plate 51 and a top plate 55. The base plate 51 is locked to the upper side of the rubber conveyor belt 32 by screws or bolts. The top plate 55 is used to install the concrete detector 4. Two tubes 52 are installed on the upper side of the base plate 51, and ball joints 53 are slidably and vertically arranged inside the tubes 52. Two ball bearings 56 are installed at the bottom of the top plate 55 to connect with the ball joints 53 for left and right rotation, so that the concrete detector 4 can rotate left and right to adapt to the uneven or arc-shaped tunnel surface. Moreover, a support spring 54 is sleeved on the ball joint 53. The support spring 54 is located between the ball bearings 56 and the tubes 52 for elastic support, pushing the ball joint 53 against the upper side of the tubes 52. There is room for movement on the lower side of the tubes 52, and the support spring 54 can also elastically support the ball bearings 56, so that the concrete detector 4 on the top plate 55 maintains the reset direction. When the concrete detector 4 is removed from the tunnel wall, it can be reset under the action of the support spring 54.

[0045] In a more specific embodiment, the present invention can separately transport the first arc-shaped piece 11 and the second arc-shaped piece 12 to a designated position for on-site assembly with the arc-shaped sliding block 2. During assembly, simply slide the arc-shaped guide rods 10 of the first arc-shaped piece 11 and the second arc-shaped piece 12 into the arc-shaped groove 22 of the arc-shaped sliding block 2. Then, the slots 13 and inserts 14 between the first arc-shaped piece 11 and the second arc-shaped piece 12 are inserted to improve support and connection strength. The first arc-shaped piece 11 and the second arc-shaped piece 12 are then locked together with bolts. Next, the drive motor 16 is locked between the first arc-shaped piece 11 and the second arc-shaped piece 12 to further improve the connectivity of the arch frame 1. The drive gear 17 is placed in the through-hole 15 and meshes with the arc-shaped rack 23 on the lower side of the arc-shaped sliding block 2, thus completing the installation. The assembled arch frame 1 forms a large arched channel in the middle for passage. Figure 9 and Figure 10 As shown, the lateral telescopic top of the side telescopic rod 18 can be used for positioning and reinforcement support on both sides of the tunnel.

[0046] In use, the vertical telescopic rod 61 of the movable lifting assembly 6 can be adjusted first to raise the entire arch frame 1 to the required detection height. This lifting method is particularly suitable for horseshoe-shaped tunnels and can match different height positions. Then, the drive motor 16 drives the drive gear 17 to rotate, causing the drive gear 17 to mesh with the drive arc rack 23, allowing the arc sliding block 2 to slide left or right along the arch frame 1, thereby conveying the movable conveying assembly 3 and the concrete detector 4 to the specified direction. If the arch shape of the tunnel matches the arc shape of the arch frame 1, the concrete detector 4 can directly press against the inner wall of the tunnel under the double elastic action of the rubber conveyor belt 32 and the elastic movable assembly 5, and be conveyed and detected along the upper arc of the arch frame 1. If the arch shape of the tunnel does not match the arc shape of the arch frame 1, the orientation of the movable conveying assembly 3 can be adjusted by the movable telescopic rods 21 on both sides to make the arc shape of the rubber conveyor belt 32 of the movable conveying assembly 3 better match the arc shape of the tunnel top. Figure 10 As shown, at this time, the arc-shaped sliding block 2 slides to the right in an arc shape under the drive of the drive structure, which can drive the concrete detector 4, which is closely attached to the tunnel interior, to rotate to the right for adaptive detection. After the arc-shaped sliding block 2 rotates and slides to the right to its limit, the conveyor motor 36 drives the rubber conveyor belt 32 to rotate to the right. The rubber conveyor belt 32 simultaneously drives the concrete detector 4, which is closely attached to the inner wall of the tunnel top, to rotate and convey to the right in two stages, so that the concrete detector 4 can perform adaptive detection over a wide range. During this period, the orientation of the rubber conveyor belt 32 can be adjusted at any time to ensure that it corresponds to the inner wall of the tunnel. The overall use is very flexible and convenient, and has good applicability.

[0047] When the concrete detector 4 is pressed against the inner wall of the tunnel, the rubber conveyor belt 32 will slightly indent inward, which improves the contact effect between the concrete detector 4 and the tunnel interior by utilizing the elastic properties of rubber. Moreover, when the rubber conveyor belt 32 rotates, the two pressure rollers 352 can roll and clamp the two sides of the rubber conveyor belt 32, thereby ensuring its positioning effect of arc-shaped rotation and conveying. The pressure rollers 352 also clamp the protrusions 321 on both sides of the rubber conveyor belt 32, which plays a certain role in clamping and tightening, making it less likely for the rubber conveyor belt 32 to slip off when under force.

[0048] Since the ball head rod 53 of the aforementioned elastic movable group 5 is slidably installed inside the cylinder 52, its ball head rod 53 is always kept pressing upward against the upper side of the cylinder 52 under the action of the support spring 54. Only when the concrete detector 4 is subjected to force will it move downward appropriately, allowing the concrete detector 4 to contact the inner wall of the tunnel under the elastic support of the support spring 54. Moreover, the ball head rod 53 and the ball bearing 56 on the lower side of the top plate 55 are connected by left and right flipping motion, so that the concrete detector 4 can also adapt to the curvature and uneven surface of the inner wall of the tunnel, and can be reset and supported under the action of the support spring 54. These two elastic effects, combined with the elastic conveying effect of the rubber conveyor belt 32, can greatly improve the use effect and applicability of the concrete detector 4.

[0049] It should be noted that the tunnel top crack safety detection device of the present invention mainly improves the above structure. The functions, components and structures not mentioned can be implemented by using existing components and structures that can achieve the corresponding functions. For example, each telescopic rod can be used by existing pneumatic telescopic cylinders, hydraulic telescopic cylinders or electric push rods.

[0050] The above embodiments illustrate and describe the basic principles and main features of the present invention, as well as its advantages. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A safety detection device for cracks in the tunnel roof, characterized in that, include: An arched frame and an arc-shaped sliding block with an arc-shaped adaptation are provided. The arc-shaped sliding block is slidably arranged along the upper side of the arched frame. A movable conveying component is movably attached to the upper side of the arc-shaped sliding block. A concrete detector is elastically and movably arranged in the middle of the upper side of the movable conveying component. The concrete detector is elastically pressed against and movably adapted to contact the top of the tunnel. The movable conveying assembly is connected to the concrete detector by an elastic movable group, which is used to apply secondary elastic force to the concrete detector and allow the concrete detector to rotate left and right. A drive structure for driving the arc-shaped sliding block to slide along the upper arc of the arch frame is installed on the lower side of the middle part of the arch frame; The arc-shaped sliding block is rotatably mounted with movable telescopic rods at its four corners, and the telescopic ends of the movable telescopic rods are movably connected to the four corners of the bottom of the movable conveying component, which are used to control the lifting height and tilt angle of the movable conveying component and the concrete detector. The movable conveying assembly includes two arc-shaped frame plates arranged at the front and rear. The left and right sides of the two arc-shaped frame plates are rotatably mounted with a first rotating shaft and a second rotating shaft to form an integral structure. One of the arc-shaped frame plates is equipped with a conveying motor for driving the rotation of the first rotating shaft and the second rotating shaft. The telescopic end of the movable telescopic rod is movably connected to the two ends of the bottom of the arc-shaped frame plate. A rubber conveyor belt is fitted between the first and second rotating shafts, and the two sides of the rubber conveyor belt are arranged in an arc shape along the middle of the two arc-shaped frame plates. Several roller pressing groups are arranged on the inner side of the two arc-shaped frame plates, and the two sides of the rubber conveyor belt are positioned by rolling and pressing the roller pressing groups. The roller pressing assembly includes a connecting rod that is vertically fixed to the inner side of the arc-shaped frame plate, and two spaced pressure rollers are installed on the connecting rod in a longitudinal rotation. The two pressure rollers are respectively clamped and rolled on the upper and lower surfaces of the side edge of the rubber conveyor belt, and anti-slip stripes are provided on the surface of the pressure rollers and the rubber conveyor belt. The rubber conveyor belt has outwardly raised protrusions integrally provided on both the front and rear sides, and the protrusions are engaged with the outer edges of the two pressure rollers. The arched frame is formed by bolting together a first arc-shaped piece and a second arc-shaped piece that are mirror images of each other. The first arc-shaped piece and the second arc-shaped piece have slots and inserts on their opposite contact surfaces that are interlocked with each other.

2. The tunnel roof cracking safety detection device according to claim 1, characterized in that, The top surface of the arc-shaped sliding block has four corners with mounting grooves, and each of the movable telescopic rods is rotatably installed in the mounting groove. When each movable telescopic rod is fully retracted, it rotates and retracts into the mounting groove, while the top of the arc-shaped sliding block is adapted to support the bottom of the arc-shaped frame plate.

3. The tunnel roof cracking safety detection device according to claim 2, characterized in that, The drive structure includes a transmission motor installed on the lower side of the middle part of the arched frame. The transmission motor shaft is equipped with a drive gear, and the middle part of the arched frame has an opening to accommodate the rotation of the drive gear. Two or more arc-shaped guide rods are fixedly installed on the upper side of the arched frame. The bottom of the arc-shaped sliding block has an arc-shaped groove that is adapted to slide with the arc-shaped guide rods, and an arc-shaped rack is installed at the bottom of the arc-shaped sliding block. The arc-shaped rack meshes with the drive gear for transmission.

4. The tunnel roof cracking safety detection device according to claim 3, characterized in that, The bottom sides of the arched frame are equipped with movable lifting assemblies, which include multiple vertical telescopic rods and support plates installed at the telescopic ends of the vertical telescopic rods. Universal locking wheels are installed at the bottom of the support plates.

5. A tunnel roof cracking safety detection device according to claim 4, characterized in that, Side telescopic rods are installed laterally on both the left and right sides of the arched frame.

6. A tunnel roof cracking safety detection device according to claim 5, characterized in that, The drive motor is installed between the first arc-shaped piece and the second arc-shaped piece by screws, and the movable lifting assembly is respectively located at the bottom of the first arc-shaped piece and the second arc-shaped piece.

7. A tunnel roof cracking safety detection device according to claim 6, characterized in that, The elastic movable assembly includes a base plate and a top plate. The base plate is locked to the upper side of the rubber conveyor belt by screws or bolts. The top plate is used to install a concrete testing instrument. Two tubes are installed on the upper side of the base plate, and ball joints are slidably and vertically arranged inside the tubes. Two ball bearings are installed at the bottom of the top plate to connect with the ball joints for left and right flipping.

8. A tunnel roof cracking safety detection device according to claim 7, characterized in that, A support spring is fitted onto the ball joint, and the support spring provides elastic support between the ball bearing and the tube.

Images