Narrow space crack detection device for supervision

Abstract

The application provides a narrow space crack detection device for supervision, comprising a support, a crack detector, a top-stretching mechanism, a driving mechanism and a remote control mechanism. The support comprises two installation plates arranged at intervals left and right, which can approach or move away from each other; the crack detector is arranged on one of the installation plates; the top-stretching mechanism is connected between the two installation plates, which can drive the two installation plates to approach or move away from each other, and make the two installation plates abut against the oppositely arranged walls in the narrow space; the driving mechanism is arranged on the two installation plates, which can drive the support to move; the remote control mechanism comprises a transmitting end and a receiving end, the transmitting end is held by a staff, and the receiving end is arranged on the installation plate; the remote control mechanism can control the opening and closing of the driving mechanism, thereby improving the applicability of the narrow space crack detection device for supervision in the narrow space.

Description

Technical Field

[0001] This invention belongs to the field of crack detection devices, specifically relating to a crack detection device for confined spaces used in supervision. Background Technology

[0002] The daily work of construction supervision includes recording project progress, quality inspection, and construction safety. For buildings such as power plants, the detection of wall cracks is a crucial part of building assessment, affecting the overall safety of the structure. Therefore, wall crack detection typically uses a crack detector (also known as a "comprehensive crack detector") to detect cracks in wall panels. Crack detectors can accurately measure and calculate the width and depth of wall cracks.

[0003] A crack detector typically includes a main unit and a detection probe connected to the main unit via a connecting cable. When in use, the detection end of the detection probe is facing the wall, and the detection probe is moved along the direction of the crack in the wall. During the movement, the detection probe transmits the data back to the main unit in a timely manner and displays it on the main unit's screen.

[0004] Regarding the aforementioned technologies, crack detectors require manual operation, which is inconvenient. Furthermore, they are difficult to access in certain confined spaces, making traditional crack detectors unsuitable for use.

[0005] Furthermore, even if people can enter, the small space may make it difficult for them to use ladders or high stools to access the area, making it hard for them to inspect the walls at higher levels of the confined space for cracks. Summary of the Invention

[0006] This invention provides a crack detection device for use in confined spaces for supervisory purposes, aiming to solve the problem that existing crack detectors are not convenient to use in confined spaces.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A crack detection device for confined spaces used in supervision is provided, comprising: a support frame, a crack detector, a lifting mechanism, a drive mechanism, and a remote control mechanism. The support frame includes two mounting plates arranged at a distance from each other, which can move closer or further apart. The crack detector is mounted on one of the mounting plates. The lifting mechanism is connected between the two mounting plates, and can drive the two mounting plates to move closer or further apart, causing them to press firmly against the opposite wall of the confined space. The drive mechanism is located on the two mounting plates and can drive the support frame to move. The remote control mechanism includes a transmitter and a receiver; the transmitter is held by the operator, and the receiver is located on the mounting plate. The remote control mechanism can control the opening and closing of the drive mechanism.

[0008] In one possible implementation, the jacking mechanism includes a first pivot cylinder and a second pivot cylinder. The first pivot cylinder is rotatably mounted on one of the mounting plates, and the second pivot cylinder is rotatably mounted on another mounting plate. The inner diameter of the first pivot cylinder is the same as the outer diameter of the second pivot cylinder, and the inner wall of the first pivot cylinder is provided with a matching thread that matches the outer wall of the second pivot cylinder. The second pivot cylinder is screwed into the first pivot cylinder.

[0009] In one possible implementation, the first pivot cylinder includes a first outer cylinder and a first inner cylinder. The inner diameter of the first outer cylinder is the same as the outer diameter of the first inner cylinder. A first pivot groove is formed on the inner wall of the first outer cylinder, and the cross-section of the first pivot groove is annular. A first pivot ring is provided at one end of the first inner cylinder, and the outer diameter of the first pivot ring is the same as the outer diameter of the cross-section of the first pivot groove. The first pivot ring is inserted into the first pivot groove. The second pivot cylinder includes a second outer cylinder and a second inner cylinder. The inner diameter of the second outer cylinder is the same as the outer diameter of the second inner cylinder. A second pivot groove is formed on the inner wall of the second outer cylinder, and the cross-section of the second pivot groove is annular. A second pivot ring is provided at both ends of the second inner cylinder, and the outer diameter of the second pivot ring is the same as the outer diameter of the cross-section of the second pivot groove. The second pivot ring is inserted into the second pivot groove. The second inner cylinder can be screwed into the first inner cylinder.

[0010] In one possible implementation, a first pivot hole is provided on one of the mounting plates, the first outer cylinder is screwed into the first pivot hole, and the length of the first outer cylinder is not greater than the length of the first pivot hole; a second pivot hole is provided on another mounting plate, the second outer cylinder is screwed into the second pivot hole, and the length of the second outer cylinder is not greater than the length of the second pivot hole; the length of the first inner cylinder is the same as the length of the second inner cylinder.

[0011] In one possible implementation, a plurality of connecting rods are provided between the two mounting plates, the length of the connecting rods being adjustable, and the connecting rods being unable to rotate relative to the two mounting plates.

[0012] In one possible implementation, the connecting rod includes a first connecting sleeve, a second connecting sleeve, and a third connecting sleeve, wherein one of the mounting plates is the first mounting plate and the other mounting plate is the second mounting plate. The cross-sections of the first connecting sleeve, the second connecting sleeve, and the third connecting sleeve are all square. The first connecting sleeve is fixed to the first mounting plate, and the third connecting sleeve is fixed to the second mounting plate. The side length of the inner hole of the first connecting sleeve is the same as the side length of the second connecting sleeve, and the side length of the inner hole of the second connecting sleeve is the same as the side length of the third connecting sleeve. The second connecting sleeve is inserted into the inner hole of the first connecting sleeve, and the third connecting sleeve is inserted into the inner hole of the second connecting sleeve.

[0013] In one possible implementation, the inner wall of the first connecting sleeve is provided with a first sliding groove, and the end of the first sliding groove away from the first mounting plate is spaced apart from the end of the first connecting sleeve away from the first mounting plate. The side wall of the second connecting sleeve is provided with a first slider, and the first slider is inserted into the first sliding groove. The inner wall of the second connecting sleeve is provided with a second sliding groove, and the end of the second sliding groove near the second mounting plate is spaced apart from the end of the second connecting sleeve near the second mounting plate. The side wall of the third connecting sleeve is provided with a second slider, and the second slider is inserted into the second sliding groove.

[0014] In one possible implementation, the drive mechanism includes a longitudinal drive component, a transverse drive component, and a caster wheel. The caster wheel is disposed on the side wall of the second mounting plate. The longitudinal drive component and the transverse drive component are slidably disposed on the first mounting plate. The transverse drive component and the longitudinal drive component can extend to the outside of the first mounting plate or retract to the top of the first mounting plate due to sliding.

[0015] In one possible implementation, the lateral drive assembly includes a first sliding motor, the power output end of which is provided with a first telescopic rod, and the top end of the first telescopic rod is provided with a first roller. The first roller can extend to one side of the first mounting plate or retract to above the first mounting plate due to the drive of the first sliding motor, and the first roller is provided with a lateral drive motor. The longitudinal drive assembly includes a second sliding motor, the power output end of which is provided with a second telescopic rod, and the top end of the second telescopic rod is provided with a second roller. The second roller can extend to one side of the first mounting plate or retract to above the first mounting plate due to the drive of the first sliding motor, and the second roller is provided with a longitudinal drive motor. The axial direction of the first roller is perpendicular to the axial direction of the second roller.

[0016] In one possible implementation, the receiving end is disposed on the first mounting plate, and the receiving end is connected to the first sliding motor, the second sliding motor, the lateral drive motor and the longitudinal drive motor.

[0017] The beneficial effects of the crack detection device for confined spaces in the supervision field provided by this invention are as follows: Compared with the prior art, the crack detection device for confined spaces in the supervision field provided by this invention, by setting up a bracket, can provide space for the installation of the crack detector on the one hand, and on the other hand, it can climb and move on the wall in conjunction with the extension mechanism and the drive mechanism; by setting up the extension mechanism, the mounting plate can be pressed against the two opposite walls in the confined space under the drive of the extension mechanism. At this time, the drive device can drive the bracket to climb and move laterally, making the crack detection device for confined spaces in the supervision field of this invention more convenient to use in confined spaces. In addition, by setting up a remote control mechanism, the staff can operate the remote control mechanism of this invention from outside the confined space, further improving the convenience of use. Attached Figure Description

[0018] Figure 1 A schematic diagram of the structure of a crack detection device for confined spaces used in supervision, provided in an embodiment of the present invention, at one angle.

[0019] Figure 2 A schematic diagram of the structural design of the crack detection device for confined spaces used in supervision provided in an embodiment of the present invention from another angle;

[0020] Figure 3 A bottom view of the structure of the crack detection device for confined spaces used in supervision provided in an embodiment of the present invention;

[0021] Figure 4 The crack detection device for confined spaces provided in the embodiments of the present invention is along... Figure 3 A schematic diagram of the cross-sectional structure along the AA direction;

[0022] Figure 5 for Figure 4 Enlarged view of part C;

[0023] Figure 6 for Figure 4 Enlarged view of part D;

[0024] Figure 7 The crack detection device for confined spaces provided in this embodiment of the invention is along... Figure 3 A schematic diagram of the cross-sectional structure along the BB direction;

[0025] Figure 8 for Figure 7 Enlarged view of part E;

[0026] Figure 9 for Figure 7 Enlarged view of part F.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Support frame; 2. Crack detector; 3. Expansion mechanism; 4. Drive mechanism; 5. Receiver;

[0029] 101. First mounting plate; 102. Second mounting plate; 103. First pivot hole; 104. Second pivot hole;

[0030] 301. First pivot cylinder; 302. Second pivot cylinder; 303. First outer cylinder; 304. First inner cylinder; 305. Second outer cylinder; 306. Second inner cylinder; 307. First pivot ring; 308. Second pivot ring; 309. Connecting rod; 310. First connecting sleeve; 311. Second connecting sleeve; 312. Third connecting sleeve; 313. First slide groove; 314. First slider; 315. Second slide groove; 316. Second slider;

[0031] 401. Longitudinal drive assembly; 402. Lateral drive assembly; 403. Caster wheel; 404. First sliding motor; 405. First roller; 407. Lateral drive motor; 408. First telescopic rod; 409. Second sliding motor; 410. Second roller; 411. Longitudinal drive motor; 412. Second telescopic rod. Detailed Implementation

[0032] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0033] It should be further noted that the accompanying drawings and embodiments of the present invention mainly describe the concept of the present invention. Based on this concept, some specific forms and arrangements of connection relationships, positional relationships, power mechanisms, power supply systems, hydraulic systems and control systems may not be fully described. However, under the premise that those skilled in the art understand the concept of the present invention, they can implement the above-mentioned specific forms and arrangements in a well-known manner.

[0034] When an element is referred to as being "fixed to" or "set on" another element, it can be directly on or indirectly on that other element. When an element is referred to as being "connected to" another element, it can be directly connected to or indirectly connected to that other element.

[0035] The terms “length,” “width,” “up,” “down,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0036] 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. Therefore, 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, and "several" means one or more, unless otherwise explicitly specified.

[0037] Please refer to the following: Figure 1 and Figure 4 The present invention provides a crack detection device for confined spaces used in construction supervision. The device includes a support 1, a crack detector 2, a lifting mechanism 3, a drive mechanism 4, and a remote control mechanism. The support 1 comprises two mounting plates arranged at a distance from each other, which can move closer or further apart. The crack detector 2 is mounted on one of the mounting plates. The lifting mechanism 3 is connected between the two mounting plates and can drive the two mounting plates to move closer or further apart, thus pressing them against the opposing walls of the confined space. The drive mechanism 4 is mounted on the two mounting plates and can drive the support 1 to move. The remote control mechanism includes a transmitter and a receiver 5. The transmitter is held by the operator, and the receiver 5 is mounted on the mounting plate. The remote control mechanism can control the opening and closing of the drive mechanism 4.

[0038] The beneficial effects of the crack detection device for confined spaces provided in this embodiment are as follows: Compared with the prior art, the crack detection device for confined spaces provided in this embodiment, by setting a bracket 1, can provide space for the installation of the crack detector 2 on the one hand, and can climb and move on the wall in conjunction with the extension mechanism 3 and the drive mechanism 4 on the other hand. By setting the extension mechanism 3, the mounting plate can be pressed against the two opposite walls of the confined space under the drive of the extension mechanism 3. At this time, the drive device can drive the bracket 1 to climb and move laterally, making the crack detection device for confined spaces of the present invention more convenient to use in confined spaces. In addition, by setting a remote control mechanism, the staff can operate the remote control mechanism of the present invention from outside the confined space, further improving the convenience of use.

[0039] Combination Figure 1 and Figure 2 As shown, the top extension mechanism 3 includes a first pivot cylinder 301 and a second pivot cylinder 302. The first pivot cylinder 301 is rotatably mounted on one of its mounting plates, and the second pivot cylinder 302 is rotatably mounted on another mounting plate. The inner diameter of the first pivot cylinder 301 is the same as the outer diameter of the second pivot cylinder 302, and the inner wall of the first pivot cylinder 301 and the outer wall of the second pivot cylinder 302 are provided with matching threads. The second pivot cylinder 302 is screwed into the first pivot cylinder 301.

[0040] By rotating the second pivot cylinder 302 relative to the first pivot cylinder 301, the length of the top extension mechanism 3 is increased, thereby causing the two mounting plates to move away from each other and thus press against the two opposing walls in the confined space. Conversely, by decreasing the length of the top extension mechanism 3, the two mounting plates are brought closer together, releasing the pressure of the mounting plates against the walls, thereby allowing the supervisory confined space crack detection device of the present invention to be disassembled.

[0041] Combination Figure 7 , Figure 8 and Figure 9 As shown, the first pivot cylinder 301 includes a first outer cylinder 303 and a first inner cylinder 304. The inner diameter of the first outer cylinder 303 is the same as the outer diameter of the first inner cylinder 304. A first pivot groove is formed on the inner wall of the first outer cylinder 303. The cross-section of the first pivot groove is annular. A first pivot ring 307 is provided at one end of the first inner cylinder 304. The outer diameter of the first pivot ring is the same as the outer diameter of the cross-section of the first pivot groove. The first pivot ring 307 is inserted into the first pivot groove. The second pivot cylinder 302 The system includes a second outer cylinder 305 and a second inner cylinder 306. The inner diameter of the second outer cylinder 305 is the same as the outer diameter of the second inner cylinder 306. A second pivot groove is provided on the inner wall of the second outer cylinder 305. The cross-section of the second pivot groove is annular. A second pivot ring 308 is provided at both ends of the second inner cylinder 306. The outer diameter of the second pivot ring is the same as the outer diameter of the cross-section of the second pivot groove. The second pivot ring 308 is inserted into the second pivot groove. The second inner cylinder 306 can be screwed into the first inner cylinder 304.

[0042] The first outer cylinder 303 is rotatable relative to the first inner cylinder 304, and the second inner cylinder 306 is rotatable relative to the second outer cylinder 305. The second inner cylinder 306 is screwed into the first inner cylinder 304, so that the first inner cylinder 304 rotates relative to the second inner cylinder 306. When adjusting the length of the top extension mechanism 3, the mounting plate can be prevented from rotating, making it easy for the mounting plate to remain horizontal, and making it easy for the bracket 1 to climb and move along the wall.

[0043] In addition, a first pivot hole 103 is provided on one mounting plate, and a first outer cylinder 303 is screwed into the first pivot hole 103, and the length of the first outer cylinder 303 is not greater than the length of the first pivot hole 103; a second pivot hole 104 is provided on the other mounting plate, and a second outer cylinder 305 is screwed into the second pivot hole 104, and the length of the second outer cylinder 305 is not greater than the length of the second pivot hole 104; the length of the first inner cylinder 304 is the same as the length of the second inner cylinder 306.

[0044] By providing a first pivot hole 103 on the first mounting plate 101, the first outer cylinder 303 is screwed into the first pivot hole 103, allowing the length of the first outer cylinder 303 protruding from the first mounting plate 101 to be adjusted. Similarly, by providing a second pivot hole 104 on the second mounting plate 102, the second outer cylinder 305 is screwed into the second pivot hole 104, allowing the length of the second outer cylinder 305 protruding from the second mounting plate 102 to be adjusted. When the opening of the confined space is not in the center of the space, the length of the first outer cylinder 303 or the second outer cylinder 305 protruding from the mounting plate can be adjusted so that the connection part of the first inner cylinder 304 and the second inner cylinder 306 is exposed at the opening of the confined space, making it easy for the operator to reach and touch the first inner cylinder 304 and the second inner cylinder 306, thereby facilitating the length adjustment of the extension mechanism 3.

[0045] like Figure 1 and Figure 2 As shown, multiple connecting rods 309 are provided between the two mounting plates. The length of the connecting rods 309 is adjustable, and the connecting rods 309 cannot rotate relative to the two mounting plates. Specifically, in this embodiment, there are two connecting rods 309.

[0046] Combination Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the connecting rod 309 includes a first connecting sleeve 310, a second connecting sleeve 311, and a third connecting sleeve 312. One mounting plate is a first mounting plate 101, and the other mounting plate is a second mounting plate 102. The cross-sections of the first connecting sleeve 310, the second connecting sleeve 311, and the third connecting sleeve 312 are all square. The first connecting sleeve 310 is fixed on the first mounting plate 101, and the third connecting sleeve 312 is fixed on the second mounting plate 102. The side length of the inner hole of the first connecting sleeve 310 is the same as the side length of the second connecting sleeve 311, and the side length of the inner hole of the second connecting sleeve 311 is the same as the side length of the third connecting sleeve 312. The second connecting sleeve 311 is inserted into the inner hole of the first connecting sleeve 310, and the third connecting sleeve 312 is inserted into the inner hole of the second connecting sleeve 311.

[0047] The second connecting sleeve 311 can be fully inserted into the first connecting sleeve 310, and the third connecting sleeve 312 can be fully inserted into the second connecting sleeve 311, so that the length of the connecting rod 309 is adjustable. Since the connecting rod 309 cannot pivot relative to the mounting plate, when installing in a confined space, holding the connecting rod 309 horizontally can keep the two mounting plates in a horizontal state.

[0048] In addition, the inner wall of the first connecting sleeve 310 is provided with a first sliding groove 313, and the end of the first sliding groove 313 away from the first mounting plate 101 is spaced apart from the end of the first connecting sleeve 310 away from the first mounting plate 101. The side wall of the second connecting sleeve 311 is provided with a first slider 314, and the first slider 314 is inserted into the first sliding groove 313.

[0049] The inner wall of the second connecting sleeve 311 is provided with a second sliding groove 315. The end of the second sliding groove 315 near the second mounting plate 102 is spaced apart from the end of the second connecting sleeve 311 near the second mounting plate 102. The side wall of the third connecting sleeve 312 is provided with a second slider 316, which is inserted into the second sliding groove 315.

[0050] The cooperation between the first slider 314 and the first groove 313 prevents the second connecting sleeve 311 from being pulled out of the first connecting sleeve 310; the cooperation between the second slider 316 and the second groove 315 prevents the third connecting sleeve 312 from being pulled out of the second connecting sleeve 311.

[0051] Combination Figure 1 river Figure 2 As shown, the drive mechanism 4 includes a longitudinal drive component 401, a transverse drive component 402, and a caster wheel 403. The caster wheel 403 is disposed on the side wall of the second mounting plate 102. The longitudinal drive component 401 and the transverse drive component 402 are slidably disposed on the first mounting plate 101. The transverse drive component 402 and the longitudinal drive component 401 can extend to the outside of the first mounting plate 101 or retract to the top of the first mounting plate 101 due to sliding.

[0052] When climbing is required, the longitudinal drive component 401 extends and presses against the wall, while the lateral drive component 402 retracts. When lateral movement is required, the lateral drive component 402 is first extended and pressed against the wall, and then the longitudinal drive component 401 is retracted.

[0053] Specifically, the lateral drive assembly 402 includes a first sliding motor 404, the power output end of which is provided with a first telescopic rod 408, and the top end of the first telescopic rod 408 is provided with a first roller 405. The first roller 405 can extend to one side of the first mounting plate 101 or retract to the top of the first mounting plate 101 due to the drive of the first sliding motor 404. The first roller 405 is provided with a lateral drive motor 407. The longitudinal drive assembly 401 includes a second sliding motor 409, the power output end of which is provided with a second telescopic rod 412, and the top end of the second telescopic rod 412 is provided with a second roller 410. The second roller 410 can extend to one side of the first mounting plate 101 or retract to the top of the first mounting plate 101 due to the drive of the first sliding motor 404. The second roller 410 is provided with a longitudinal drive motor 411. The axial direction of the first roller is perpendicular to the axial direction of the second roller.

[0054] Finally, the receiver 5 is mounted on the first mounting plate 101 and is connected to the first sliding motor 404, the second sliding motor 409, the horizontal drive motor 407 and the vertical drive motor 411.

[0055] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A crack detection device for confined spaces used in supervision, characterized in that, include: The bracket includes two mounting plates arranged at a distance from each other on the left and right. The two mounting plates can move closer to each other or further away from each other. One of the mounting plates is a first mounting plate, and the other mounting plate is a second mounting plate. A crack detector is mounted on one of the mounting plates described herein; A top extension mechanism is connected between two mounting plates. The top extension mechanism can drive the two mounting plates to move closer or further apart, and make the two mounting plates press against the opposite wall in a narrow space. A drive mechanism is provided on the two mounting plates, and the drive mechanism is capable of driving the bracket to move. The remote control mechanism includes a transmitter and a receiver. The transmitter is held by a worker, and the receiver is mounted on the mounting plate. The remote control mechanism can control the opening and closing of the drive mechanism. The jacking mechanism includes a first pivot cylinder and a second pivot cylinder. The first pivot cylinder is rotatably mounted on one of the mounting plates, and the second pivot cylinder is rotatably mounted on the other mounting plate. The inner diameter of the first pivot cylinder is the same as the outer diameter of the second pivot cylinder, and the inner wall of the first pivot cylinder and the outer wall of the second pivot cylinder are provided with matching threads. The second pivot cylinder is screwed into the first pivot cylinder. A plurality of connecting rods are provided between the two mounting plates. The length of the connecting rods is adjustable, and the connecting rods cannot rotate relative to the two mounting plates. The drive mechanism includes a longitudinal drive component, a transverse drive component, and a caster wheel. The caster wheel is disposed on the side wall of the second mounting plate. The longitudinal drive component and the transverse drive component are slidably disposed on the first mounting plate. The transverse drive component and the longitudinal drive component can extend to the outside of the first mounting plate or retract to the top of the first mounting plate due to sliding. The first pivot cylinder includes a first outer cylinder and a first inner cylinder. The inner diameter of the first outer cylinder is the same as the outer diameter of the first inner cylinder. A first pivot groove is formed on the inner wall of the first outer cylinder. The cross-section of the first pivot groove is annular. A first pivot ring is provided at one end of the first inner cylinder. The outer diameter of the first pivot ring is the same as the outer diameter of the cross-section of the first pivot groove. The first pivot ring is inserted into the first pivot groove. The second pivot cylinder includes a second outer cylinder and a second inner cylinder. The inner diameter of the second outer cylinder is the same as the outer diameter of the second inner cylinder. A second pivot groove is formed on the inner wall of the second outer cylinder. The cross-section of the second pivot groove is annular. A second pivot ring is provided at both ends of the second inner cylinder. The outer diameter of the second pivot ring is the same as the outer diameter of the cross-section of the second pivot groove. The second pivot ring is inserted into the second pivot groove. The second inner cylinder can be screwed into the first inner cylinder.

2. The crack detection device for confined spaces used in supervision as described in claim 1, characterized in that, One of the mounting plates has a first pivot hole, the first outer cylinder is screwed into the first pivot hole, and the length of the first outer cylinder is not greater than the length of the first pivot hole; the other mounting plate has a second pivot hole, the second outer cylinder is screwed into the second pivot hole, and the length of the second outer cylinder is not greater than the length of the second pivot hole; the length of the first inner cylinder is the same as the length of the second inner cylinder.

3. The crack detection device for confined spaces used in supervision as described in claim 1, characterized in that, The connecting rod includes a first connecting sleeve, a second connecting sleeve, and a third connecting sleeve. The cross-sections of the first connecting sleeve, the second connecting sleeve, and the third connecting sleeve are all square. The first connecting sleeve is fixed to the first mounting plate, and the third connecting sleeve is fixed to the second mounting plate. The side length of the inner hole of the first connecting sleeve is the same as the side length of the second connecting sleeve, and the side length of the inner hole of the second connecting sleeve is the same as the side length of the third connecting sleeve. The second connecting sleeve is inserted into the inner hole of the first connecting sleeve, and the third connecting sleeve is inserted into the inner hole of the second connecting sleeve.

4. The crack detection device for confined spaces used in supervision as described in claim 3, characterized in that, The first connecting sleeve has a first sliding groove on its inner wall, with the end of the first sliding groove away from the first mounting plate and the end of the first connecting sleeve away from the first mounting plate spaced apart. The second connecting sleeve has a first slider on its side wall, which is inserted into the first sliding groove. The second connecting sleeve has a second sliding groove on its inner wall, with the end of the second sliding groove near the second mounting plate spaced apart from the end of the second connecting sleeve near the second mounting plate. The third connecting sleeve has a second slider on its side wall, which is inserted into the second sliding groove.

5. The crack detection device for confined spaces used in supervision as described in claim 1, characterized in that, The lateral drive assembly includes a first sliding motor, the power output end of which is provided with a first telescopic rod, and the top end of the first telescopic rod is provided with a first roller. The first roller can extend to one side of the first mounting plate or retract to above the first mounting plate due to the drive of the first sliding motor. The first roller is provided with a lateral drive motor. The longitudinal drive assembly includes a second sliding motor, the power output end of which is provided with a second telescopic rod, and the top end of the second telescopic rod is provided with a second roller. The second roller can extend to one side of the first mounting plate or retract to above the first mounting plate due to the drive of the first sliding motor. The second roller is provided with a longitudinal drive motor. The axial direction of the first roller is perpendicular to the axial direction of the second roller.

6. The crack detection device for confined spaces used in supervision as described in claim 5, characterized in that, The receiving end is disposed on the first mounting plate, and the receiving end is connected to the first sliding motor, the second sliding motor, the horizontal drive motor and the vertical drive motor.

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