A concrete pole crack detection device

Abstract

The application belongs to the technical field of concrete pole detection, and particularly relates to a concrete pole crack detection device, which comprises a mounting frame, a plurality of supporting hydraulic cylinders are fixedly connected to the side wall of the mounting frame, the moving end of the supporting hydraulic cylinder penetrates through the mounting frame and is fixedly connected with a supporting plate, the supporting plate is in an arc structure, and the concrete pole to be detected is placed on the plurality of supporting plates. The concrete pole surface cracks are detected in a step-by-step manner of water detection first and negative pressure detection later, the wide and through harmful cracks are directly detected through water detection, the fine and through harmful cracks are accurately captured by means of air pressure, the surface harmless scratches and different specifications of through harmful cracks can be efficiently distinguished through layer-by-layer investigation, the crack determination accuracy is improved, the small harmful cracks are prevented from being missed, the scratches are prevented from being mistaken as diseases, and the reliability of the pole crack detection result is ensured.

Description

Technical Field

[0001] This invention belongs to the field of concrete pole testing technology, and in particular relates to a device for detecting cracks in concrete poles. Background Technology

[0002] Concrete poles are core supporting components for power grids and overhead communication lines. Their structural stability directly affects the safe operation and service life of the lines. During the prefabrication and production of concrete poles, surface and internal cracks are easily generated due to factors such as raw material ratio, vibration, curing, and demolding. If accurate crack detection is not completed before leaving the factory, the defective poles will continue to expand under long-term outdoor conditions such as wind pressure, temperature changes, and foundation settlement. This will damage the integrity of the pole structure, reduce its load-bearing capacity, and accelerate the intrusion of moisture and corrosive media, causing internal steel corrosion and concrete loosening and falling off. This can easily lead to accidents such as pole breakage and collapse. Therefore, crack detection before leaving the factory is an important quality control procedure for poles.

[0003] In current factory testing of concrete poles, it is difficult to distinguish between harmless scratches on the pole surface and penetrating harmful cracks. Harmless scratches mostly occur during demolding, handling, and stacking, and are only minor damage to the concrete surface. They are shallow, non-penetrating, and do not affect the overall structural strength and service safety of the pole. However, penetrating harmful cracks are structural defects that can extend from the surface to the interior of the pole, directly destroying the overall structural integrity and significantly reducing the load-bearing capacity of the pole. Traditional manual inspection and conventional equipment inspection are prone to misjudgment and omission. Mistakenly judging harmless scratches as defects will cause qualified products to be scrapped and increase production costs. Omitting penetrating cracks will allow poles with hidden dangers to enter the market.

[0004] To address this issue, a concrete pole crack detection device is proposed. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a device for detecting cracks in concrete utility poles.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a concrete pole crack detection device, comprising a mounting frame, wherein multiple supporting hydraulic cylinders are fixedly connected to the side wall of the mounting frame, the moving end of each supporting hydraulic cylinder passes through the mounting frame and is fixedly connected to a supporting plate, the supporting plate having an arc-shaped structure, the concrete pole to be tested is placed on the multiple supporting plates, and further comprising: A lead screw linear module is located behind the support plate. Two vertical plates are fixedly connected to the lower side wall of the lead screw linear module. The lower side wall of the vertical plates is connected to the mounting bracket. The moving end of the lead screw linear module is connected to a cleaning component through a drive assembly. Both the water detection component and the negative pressure detection component are located at the moving end of the drive component.

[0007] Preferably, the drive assembly includes a fixed ring fixedly connected to the moving end of the lead screw linear module, a drive ring rotatably connected to the inner wall of the fixed ring via a bearing, a drive motor fixedly connected to the side wall of the fixed ring, and the output end of the drive motor being driven by the drive ring via a gear ring transmission mechanism.

[0008] Preferably, the cleaning assembly includes a first fixed frame fixedly connected to the side wall of the drive ring, a first electric push rod connected to the side wall of the first fixed frame, and an electric cleaning roller fixedly connected to the moving end of the first electric push rod via a pressure sensor. The rotating part of the electric cleaning roller has a conical cylindrical structure.

[0009] Preferably, the water testing assembly includes a placement frame fixedly connected to the side wall of the drive ring. The placement frame and the first fixed frame are located on the same side. A first visual sensor is fixedly connected to the side wall of the placement frame near the concrete pole to be tested. A water tank is fixedly connected to the side wall of the placement frame away from the first visual sensor. A small pump is fixedly connected to the side wall of the water tank. The inlet end of the small pump is connected to the water tank. The outlet end of the small pump passes through the placement frame and is fixedly connected to an impact-type atomizing nozzle.

[0010] Preferably, the negative pressure detection assembly includes a second fixed frame fixedly connected to the side wall of the drive ring. The second fixed frame and the first fixed frame are symmetrically arranged about the drive ring. A second visual sensor is fixedly connected to the side wall of the second fixed frame near the concrete pole to be tested. A second electric push rod is fixedly connected to the side wall of the second fixed frame. The moving end of the second electric push rod passes through the second fixed frame and is fixedly connected to a lifting plate. A rotating column is rotatably connected to the lower side wall of the lifting plate and a small motor is fixedly connected thereto. The output end of the small motor is transmitted through a gear ring transmission mechanism. The device is connected to a rotating column drive. A negative pressure box is fixedly connected to the lower end of the rotating column. A separation frame is fixedly connected to the inner wall of the negative pressure box. The separation frame has an inverted U-shaped structure. A vertical tube is inserted into the lower side wall of the negative pressure box. The upper end of the vertical tube communicates with the lower side wall of the separation frame. A suction cup is fixedly connected to the lower end of the vertical tube. A small electric push rod is connected to the right side wall of the negative pressure box. The moving end of the small electric push rod passes through the negative pressure box and is connected to a piston plate above the separation frame. A pressure sensor is connected to the side wall of the negative pressure box. A bonding component is connected to the lower side wall of the negative pressure box.

[0011] Preferably, the bonding assembly includes multiple short tubes fixedly inserted into the lower side wall of the negative pressure chamber. Each short tube contains a solenoid valve. A piston cylinder is fixedly connected to the lower end of each short tube. A piston seat is slidably disposed within the piston cylinder. A spring connects the piston seat and the inner wall of the piston cylinder. A pressure rod is fixedly connected to the lower side wall of the piston seat. A vertical hole matching the pressure rod is opened on the lower side wall of the piston cylinder. The lower end of the pressure rod passes through the vertical hole and is fixedly connected to a pressure seat via a pressure sensor.

[0012] Preferably, the side wall of the negative pressure box is connected to a pressure relief pipe, and a control valve is provided inside the pressure relief pipe.

[0013] Preferably, a sensing plate is connected to the side wall of the moving end of the lead screw linear module, and multiple position switches are connected to the side wall of the fixed part of the lead screw linear module.

[0014] Compared with existing technologies, the advantages of a concrete pole crack detection device are: By using water testing and negative pressure testing components, a step-by-step approach of water testing followed by negative pressure testing is adopted to inspect surface cracks on concrete poles. Water testing directly detects wide, penetrating, harmful cracks, while air pressure is used to precisely capture minute, penetrating, harmful cracks. This layered inspection can efficiently distinguish between harmless surface scratches and penetrating, harmful cracks of different sizes, improving the accuracy of crack detection, avoiding the omission of small harmful cracks and the misidentification of scratches as defects, and ensuring the reliability of pole crack detection results.

[0015] By using the cleaning components, the surface of the concrete poles can be cleaned of adhering substances, laitance, and dust before testing. This eliminates obstruction and interference from debris, fully exposing various cracks and scratches, avoiding misleading judgments due to dirt, and effectively improving the accuracy and efficiency of subsequent water and negative pressure testing.

[0016] By using a specially designed adhesive component, when detecting minute through-cracks in concrete poles using negative pressure, the suction cup fits tightly against the crack surface, preventing external air from seeping in and ensuring a stable, sealed negative pressure environment. This not only prevents air leakage that could lead to insufficient negative pressure and inaccurate identification of minute through-cracks, but also improves the sensitivity of negative pressure change feedback and reduces false positives and missed detections caused by poor sealing. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a concrete pole crack detection device provided by the present invention; Figure 2 This is a schematic diagram of the surface structure of the linear screw module in a concrete pole crack detection device provided by the present invention. Figure 3 This is a schematic diagram of the surface structure of the fixing ring in a concrete pole crack detection device provided by the present invention; Figure 4 This is a schematic diagram of the drive assembly in a concrete pole crack detection device provided by the present invention; Figure 5 This is a schematic diagram of the water detection component in a concrete pole crack detection device provided by the present invention; Figure 6 This is a schematic diagram of the negative pressure detection component in a concrete pole crack detection device provided by the present invention; Figure 7 This is a schematic diagram of the internal structure of the negative pressure box in a concrete pole crack detection device provided by the present invention; Figure 8 This is a schematic diagram of the bonding component in a concrete pole crack detection device provided by the present invention.

[0018] In the diagram: 1. Mounting frame, 2. Support hydraulic cylinder, 3. Support plate, 4. Lead screw linear module, 5. Drive assembly, 51. Fixing ring, 52. Drive ring, 6. Drive motor, 7. Cleaning assembly, 71. First fixing frame, 72. First electric push rod, 8. Electric cleaning roller, 9. Water detection assembly, 91. Placement frame, 92. First vision sensor, 10. Water tank, 11. Small pump, 12. Impact atomizing nozzle, 13. Negative pressure detection assembly, 131. Second fixing frame, 132. Second vision sensor, 14. Second electric push rod, 15. Lifting plate, 16. Rotary column, 17. Small motor, 18. Negative pressure box, 19. Separation frame, 20. Vertical pipe, 21. Suction cup, 22. Small electric push rod, 23. Piston plate, 24. Air pressure sensor, 25. Adhesion assembly, 251. Short pipe, 252. Solenoid valve, 26. Piston cylinder, 27. Piston seat, 28. Pressure rod, 29. Pressure seat, 30. Pressure relief pipe, 31. Control valve, 32. Sensing plate, 33. Position switch. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] like Figures 1-8 As shown, a concrete pole crack detection device includes a mounting frame 1, with multiple supporting hydraulic cylinders 2 fixedly connected to the side wall of the mounting frame 1. The moving end of the supporting hydraulic cylinder 2 passes through the mounting frame 1 and is fixedly connected to a supporting plate 3. The supporting plate 3 has an arc-shaped structure. The concrete pole to be tested is placed on the multiple supporting plates 3. The device also includes: A linear screw module 4 is located behind the support plate 3. A sensor plate 32 is connected to the side wall of the moving end of the linear screw module 4. Multiple position switches 33 are connected to the side wall of the fixed part of the linear screw module 4. Two vertical plates are fixedly connected to the lower side wall of the linear screw module 4. The lower side wall of the vertical plates is connected to the mounting bracket 1. The moving end of the linear screw module 4 is connected to the cleaning component 7 through the drive component 5. The drive component 5 includes a fixing ring 51 fixedly connected to the moving end of the linear screw module 4. A drive ring 52 is rotatably connected to the inner wall of the fixing ring 51 through a bearing. A drive motor 6 is fixedly connected to the side wall of the fixing ring 51. The output end of the drive motor 6 is connected to the drive ring 52 through a gear ring transmission mechanism. The cleaning assembly 7 includes a first fixed frame 71 fixedly connected to the side wall of the drive ring 52. A first electric push rod 72 is connected to the side wall of the first fixed frame 71. The moving end of the first electric push rod 72 is fixedly connected to an electric cleaning roller 8 through a pressure sensor. The rotating part of the electric cleaning roller 8 has a conical cylindrical structure.

[0021] Both the water detection component 9 and the negative pressure detection component 13 are located at the moving end of the drive component 5. The water detection component 9 includes a placement frame 91 fixedly connected to the side wall of the drive ring 52. The placement frame 91 and the first fixed frame 71 are located on the same side. A first visual sensor 92 is fixedly connected to the side wall of the placement frame 91 near the concrete pole to be tested. A water tank 10 is fixedly connected to the side wall of the placement frame 91 away from the first visual sensor 92. A small pump 11 is fixedly connected to the side wall of the water tank 10. The inlet end of the small pump 11 is connected to the water tank 10. The outlet end of the small pump 11 passes through the placement frame 91 and is fixedly connected to an impact atomizing nozzle 12.

[0022] The negative pressure detection assembly 13 includes a second fixed frame 131 fixedly connected to the side wall of the drive ring 52. The second fixed frame 131 and the first fixed frame 71 are symmetrically arranged about the drive ring 52. A second visual sensor 132 is fixedly connected to the side wall of the second fixed frame 131 near the concrete pole to be tested. A second electric push rod 14 is fixedly connected to the side wall of the second fixed frame 131. The moving end of the second electric push rod 14 passes through the second fixed frame 131 and is fixedly connected to a lifting plate 15. A rotating column 16 is rotatably connected to the lower side wall of the lifting plate 15 and a small motor 17 is fixedly connected thereto. The output end of the small motor 17 is connected to the rotating column 16 through a gear ring transmission mechanism. The lower side wall of the rotating column 16... A negative pressure box 18 is fixedly connected to the end of the negative pressure box 18. A pressure relief pipe 30 is connected to the side wall of the negative pressure box 18. A control valve 31 is installed inside the pressure relief pipe 30. A separation frame 19 is fixedly connected to the inner wall of the negative pressure box 18. The separation frame 19 has an inverted U-shaped structure. A vertical pipe 20 is inserted into the lower side wall of the negative pressure box 18. The upper end of the vertical pipe 20 is connected to the lower side wall of the separation frame 19. A suction cup 21 is fixedly connected to the lower end of the vertical pipe 20. A small electric push rod 22 is connected to the right side wall of the negative pressure box 18. The moving end of the small electric push rod 22 passes through the negative pressure box 18 and is connected to a piston plate 23 above the separation frame 19. A pressure sensor 24 is connected to the side wall of the negative pressure box 18. A bonding component 25 is connected to the lower side wall of the negative pressure box 18.

[0023] The bonding assembly 25 includes multiple short tubes 251 fixedly inserted into the lower side wall of the negative pressure box 18. A solenoid valve 252 is installed inside the short tubes 251. A piston cylinder 26 is fixedly connected to the lower end of the short tubes 251. A piston seat 27 is slidably installed inside the piston cylinder 26. A spring is connected between the piston seat 27 and the inner wall of the piston cylinder 26. A pressure rod 28 is fixedly connected to the lower side wall of the piston seat 27. A vertical hole matching the pressure rod 28 is opened on the lower side wall of the piston cylinder 26. The lower end of the pressure rod 28 passes through the vertical hole and is fixedly connected to a pressure seat 29 through a pressure sensor.

[0024] The operating principle of this invention is explained as follows: The operator uses external hoisting equipment to place the concrete pole to be tested above multiple support plates 3 on the surface of the mounting frame 1. Then, an electrical signal is sent to the external controller. After receiving the electrical signal, the controller will control the linear screw module 4 to work. The linear screw module 4 will drive the fixing ring 51 to move closer to the concrete pole to be tested. When the sensing plate 32 on the moving end surface of the linear screw module 4 moves in front of the corresponding position switch 33, the position switch 33 will send an electrical signal to the controller. After receiving the electrical signal, the controller will control the corresponding support hydraulic cylinder 2 to work. The support hydraulic cylinder 2 will drive the support plate 3 on that side to move downward and separate from the concrete pole, so as to facilitate the movement of the fixing ring 51. Until the next position switch 33 detects the approach of the sensing plate 32, it will control the previous support hydraulic cylinder 2 to drive the support plate 3 to move upward to support the concrete pole before controlling the corresponding support hydraulic cylinder 2 to drive the support plate 3 on that side to move downward. During the movement of components such as the fixed ring 51 driving the drive ring 52, the controller controls the first electric push rod 72 to work, causing the first electric push rod 72 to drive the electric cleaning roller 8 to contact the concrete pole. Through the pressure sensor between the first electric push rod 72 and the electric cleaning roller 8, a 20N compressive force is maintained between the electric cleaning roller 8 and the concrete pole. The controller also controls the drive motor 6 to work. The drive motor 6 controls the drive ring 52 to rotate through a gear ring transmission mechanism (the gear ring transmission mechanism includes a drive gear fixedly connected to the output end of the drive motor 6 and a gear ring sleeved on the outer wall of the drive ring 52. Through the meshing of the drive gear and the gear ring, the drive motor 6 can drive the drive ring 52 to rotate). The drive ring 52 drives the electric cleaning roller 8 to move in a circle along the concrete pole through the first fixed frame 71, using the electric cleaning roller 8 to clean the surface of the concrete pole of laitance, dust and other debris. After the electric cleaning roller 8 cleans the debris from the surface of the concrete pole, the controller uses the first vision sensor 92 to detect cracks on the surface of the concrete pole. When the controller detects cracks on the surface of the concrete pole through the first vision sensor 92, it controls the linear screw module 4 and the drive assembly 5 to stop moving, so that the placement frame 91 and the first vision sensor 92 stop at the crack. Then, the controller controls the small pump 11 to work, and the small pump 11 sprays water from the water tank 10 onto the concrete pole through the impact atomizing nozzle 12, targeting wide, through-cracks. After water is sprayed on the concrete pole, the water seeps deep into the cracks, and water seepage marks gradually appear around the cracks, forming continuous water stains that extend inward. Harmless scratches or tiny penetrating harmful cracks (tiny penetrating harmful cracks have air trapped inside, forming an air blockage, and water mist cannot push open the air blockage to seep into the pole wall. The water only hangs on the surface of the crack, and the changes in dryness and wetness are no different from scratches) only have water hanging on the surface, and the water cannot seep down. The water stains are limited to the surface of the scratches and evaporate quickly. The controller uses a visual sensor to compare images and identify obvious differences in the shape and diffusion range of the two water stains, and intuitively distinguishes between large penetrating harmful cracks. When the controller detects that the crack is only covered by surface water via the vision sensor, it controls the negative pressure detection component 13 to move to the crack via the lead screw linear module 4 and drive component 5, and controls the second electric push rod 14 to move the lifting plate 15 and suction cup 21 towards the crack. Simultaneously, it controls the small motor 17 to rotate the rotating column 16 and suction cup 21 via a gear ring transmission mechanism. When the controller detects that the angle of the suction cup 21 is the same as the angle of the crack via the second vision sensor 132, it controls the small motor 17 to stop. Similarly, when it detects that the suction cup 21 is in contact with the crack, it controls the second electric push rod 14 to stop. Then, the controller controls the small electric push rod 22 to move the piston plate 23 to a set position, reducing the air pressure in the space to the left of the piston plate 23 (see reference). Figure 7As shown in the diagram, the air pressure in the space on the right increases. Under negative pressure, the suction cup 21 adheres to the surface of the concrete pole. Simultaneously, due to the increased air pressure in the space on the right side of the piston plate 23, and with all solenoid valves 252 closed and the control valve 31 in the pressure relief pipe 30 closed, the air pressure above the piston seat 27 increases. Under this air pressure, the piston seat 27 moves the pressure seat 29 downward via the pressure rod 28, causing the pressure seat 29 to press the skirt of the suction cup 21 against the concrete pole. When the controller detects the pressure between the pressure seat 29 and the skirt through the pressure sensor between the pressure rod 28 and the pressure seat 29... Once the extrusion pressure reaches the set threshold (50N), the controller will control the corresponding solenoid valve 252 to close. When all solenoid valves 252 are closed, the controller will control the control valve 31 inside the pressure relief pipe 30 to open, facilitating the discharge of gas inside the negative pressure box 18. When the small electric push rod 22 stops working, the controller will detect the change in air pressure inside the negative pressure box 18 through the air pressure sensor 24. If there is no change in air pressure inside the negative pressure box 18 within 30 seconds, it indicates that the crack is a harmless scratch. Otherwise, it is a minor through-type harmful crack. The controller will record the through-type harmful crack for the operator to check.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A concrete pole crack detection device, comprising a mounting frame (1), wherein a plurality of supporting hydraulic cylinders (2) are fixedly connected to the side wall of the mounting frame (1), the moving end of the supporting hydraulic cylinders (2) passes through the mounting frame (1) and is fixedly connected to a supporting plate (3), the supporting plate (3) having an arc-shaped structure, and the concrete pole to be tested is placed on the plurality of supporting plates (3), characterized in that, Also includes: The lead screw linear module (4) is located behind the support plate (3). Two vertical plates are fixedly connected to the lower side wall of the lead screw linear module (4). The lower side wall of the vertical plates is connected to the mounting bracket (1). The moving end of the lead screw linear module (4) is connected to the cleaning component (7) through the drive component (5). The water detection component (9) and the negative pressure detection component (13) are both located at the moving end of the drive component (5). The drive component (5) includes a fixed ring (51) fixedly connected to the moving end of the lead screw linear module (4). The inner wall of the fixed ring (51) is rotatably connected to a drive ring (52) via a bearing. The side wall of the fixed ring (51) is fixedly connected to a drive motor (6). The output end of the drive motor (6) is connected to the drive ring (52) via a gear ring transmission mechanism. The negative pressure detection component (13) is located at the moving end of the drive component (5). 3) Includes a second fixing frame (131) fixedly connected to the side wall of the drive ring (52). The second fixing frame (131) and the first fixing frame (71) are symmetrically arranged about the drive ring (52). A second vision sensor (132) is fixedly connected to the side wall of the second fixing frame (131) near the concrete pole to be tested. A second electric push rod (14) is fixedly connected to the side wall of the second fixing frame (131). The moving end of the second electric push rod (14) passes through the second fixing frame (131) and is fixedly connected to it. A lifting plate (15) is provided, and a rotating column (16) is rotatably connected to the lower side wall of the lifting plate (15), and a small motor (17) is fixedly connected thereto. The output end of the small motor (17) is connected to the rotating column (16) through a gear ring transmission mechanism. A negative pressure box (18) is fixedly connected to the lower end of the rotating column (16), and a separation frame (19) is fixedly connected to the inner wall of the negative pressure box (18). The separation frame (19) has an inverted U-shaped structure, and a vertical pipe (20) is inserted into the lower side wall of the negative pressure box (18). The upper end of the vertical tube (20) is connected to the lower side wall of the separation frame (19). The lower end of the vertical tube (20) is fixedly connected to a suction cup (21). The right side wall of the negative pressure box (18) is connected to a small electric push rod (22). The moving end of the small electric push rod (22) passes through the negative pressure box (18) and is connected to a piston plate (23) above the separation frame (19). The side wall of the negative pressure box (18) is connected to a pressure sensor (24). The lower side wall of the negative pressure box (18) is connected to a bonding component (25).

2. The concrete pole crack detection device according to claim 1, characterized in that, The cleaning assembly (7) includes a first fixed frame (71) fixedly connected to the side wall of the drive ring (52). The side wall of the first fixed frame (71) is connected to a first electric push rod (72). The moving end of the first electric push rod (72) is fixedly connected to an electric cleaning roller (8) through a pressure sensor. The rotating part of the electric cleaning roller (8) is a conical cylindrical structure.

3. The concrete pole crack detection device according to claim 1, characterized in that, The water testing assembly (9) includes a placement frame (91) fixedly connected to the side wall of the drive ring (52). The placement frame (91) and the first fixed frame (71) are located on the same side. A first visual sensor (92) is fixedly connected to the side wall of the placement frame (91) near the concrete pole to be tested. A water tank (10) is fixedly connected to the side wall of the placement frame (91) away from the first visual sensor (92). A small pump (11) is fixedly connected to the side wall of the water tank (10). The inlet end of the small pump (11) is connected to the water tank (10). The outlet end of the small pump (11) passes through the placement frame (91) and is fixedly connected to an impact atomizing nozzle (12).

4. The concrete pole crack detection device according to claim 1, characterized in that, The bonding assembly (25) includes multiple short tubes (251) fixedly inserted into the lower side wall of the negative pressure box (18). A solenoid valve (252) is provided inside the short tube (251). A piston cylinder (26) is fixedly connected to the lower end of the short tube (251). A piston seat (27) is slidably provided inside the piston cylinder (26). A spring is connected between the piston seat (27) and the inner wall of the piston cylinder (26). A pressure rod (28) is fixedly connected to the lower side wall of the piston seat (27). A vertical hole matching the pressure rod (28) is opened on the lower side wall of the piston cylinder (26). The lower end of the pressure rod (28) passes through the vertical hole and is fixedly connected to a pressure seat (29) through a pressure sensor.

5. The concrete pole crack detection device according to claim 1, characterized in that, The side wall of the negative pressure box (18) is connected to a pressure relief pipe (30), and a control valve (31) is provided inside the pressure relief pipe (30).

6. The concrete pole crack detection device according to claim 1, characterized in that, The side wall of the moving end of the linear screw module (4) is connected to a sensor plate (32), and the side wall of the fixed part of the linear screw module (4) is connected to multiple position switches (33).

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