A crack detection device for a building surface

Abstract

This invention relates to the field of building crack detection technology, and more particularly to a crack detection device for building surfaces, comprising a main plate, an upper end of which is provided with a detection and grinding mechanism, the detection and grinding mechanism including a first limiting groove formed on the upper end of the main plate, a first limiting body slidably connected to the main plate in the first limiting groove, a second electric telescopic rod fixedly connected to the upper end of the first limiting body, and a sealing air outlet mechanism for sealing the inside of the grid provided on the upper end of the auxiliary support plate; during grinding, an elastic support tube drives the side of a fourth fixing body to contact the pore surface, and then an air pump reduces the pressure inside the fourth fixing body through the support tube, thereby sucking out impurities from the pore surface and inside the pores, facilitating the detection of the gaps at the grid pores by a second optical detector on the side of the fixing plate.

Description

Technical Field

[0001] This invention relates to the field of building crack detection technology, and more particularly to a crack detection device for building surfaces. Background Technology

[0002] Surface crack detection for buildings is widely used in daily inspections, final acceptance, safety assessments, and post-disaster investigations of buildings, bridges, tunnels, water conservancy dams, and exterior curtain walls. Its core principle relies on optical imaging, image recognition, laser ranging, and sensing technology. By collecting images or deformation data of the building surface and comparing and analyzing changes in texture, grayscale, contour, and size, it accurately identifies the location, length, width, and extension trend of cracks, thereby assessing the degree of structural damage. For some ancient wooden buildings, the structure includes a lower support column, a rectangular support strip fixedly connected to the upper end of the support column, an arch fixedly connected to the upper end of the support strip, and the sides of the support strip are generally set with several grid-like structures.

[0003] Existing technologies for inspecting mesh grids typically involve workers sanding and cleaning the surface of the wooden grid, followed by manual inspection. This process is inefficient. Furthermore, existing technologies cannot sand and inspect the gaps between the mesh grids, leading to weathering and cracks within these gaps, which can damage the grid and reduce its quality. When using optical imaging to inspect for gaps, existing technologies cannot seal the grid gaps, allowing light to enter and reducing inspection accuracy. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the prior art by proposing a crack detection device for building surfaces.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a crack detection device for building surfaces, comprising a main plate, wherein a detection and grinding mechanism is provided at the upper end of the main plate, the detection and grinding mechanism includes a first limiting groove formed at the upper end of the main plate, a first limiting body slidably connected to the main plate in the first limiting groove, a second electric telescopic rod fixedly connected to the upper end of the first limiting body, a first fixing body fixedly connected to the telescopic end of the second electric telescopic rod, a third slot formed on the side of the first fixing body, a first optical detector provided in the third slot of the first fixing body, first placement slots symmetrically formed on the side of the main plate, a first electric telescopic rod fixedly connected to the main plate in each of the first placement slots, a secondary support plate fixedly connected to the telescopic ends of the two first electric telescopic rods, a clamping body fixedly connected to the upper ends of the main plate and the secondary support plate, and a sealing venting mechanism for sealing the inside of the grille provided at the upper end of the secondary support plate.

[0006] Preferably, the first fixing body has symmetrically formed first slots on its side. The first fixing body is fixedly connected to two third electric telescopic rods in the two first slots. The telescopic ends of the two third electric telescopic rods are respectively fixedly connected to second fixing bodies. The sides of the two second fixing bodies are respectively formed to sixth slots. The bodies of the two second fixing bodies are respectively formed to second placement slots that communicate with the sixth slots. The two second fixing bodies are respectively fixedly connected to second motors in the second placement slots. The drive shaft ends of the two second motors are respectively fixedly connected to first grinding rollers.

[0007] Preferably, the first fixing body has a second slot on its side, and a flexible first annular plate is fixedly connected to the first fixing body in the second slot. The first fixing body has a rotating slot on its side, and a rotating body is rotatably connected to the first fixing body in the rotating slot. An air pump communicating with the outside is provided at the end of the rotating body.

[0008] Preferably, a telescopic pipe communicating with an air pump is fixedly connected to the side of the rotating body, a fixed plate is fixedly connected to the end of the telescopic pipe, a fourth electric telescopic rod is symmetrically connected to the end of the rotating body, the telescopic ends of the two fourth electric telescopic rods are respectively fixedly connected to the end of the fixed plate, a plurality of through holes are opened on the side of the telescopic pipe, and a second optical detector is provided on the side of the fixed plate.

[0009] Preferably, the end of the fixing plate is an open structure, a fifth electric telescopic rod is fixedly connected to the side of the fixing plate, a third fixing body is fixedly connected to the telescopic end of the fifth electric telescopic rod, a second cavity is opened on the side of the third fixing body, a fourth motor is fixedly connected to the third fixing body in the second cavity, and a second grinding roller is fixedly connected to the drive shaft end of the fourth motor.

[0010] Preferably, a support tube is provided on the side of the fixing plate, and a fourth fixing body is fixedly connected to the end of the support tube. One side of the fourth fixing body is an open structure communicating with the support tube. A fourth slot is provided on the side of the fourth fixing body, and a flexible second annular plate is provided in the fourth slot of the fourth fixing body.

[0011] Preferably, the first fixing body has a first cavity communicating with the rotating groove on its side. A third motor is fixedly connected to the first fixing body in the first cavity. A gear is fixedly connected to the drive shaft end of the third motor. A gear ring meshing with the gear is fixedly connected to the side of the rotating body. A first motor is fixedly connected to the side of the main plate. A first threaded rod is fixedly connected to the drive shaft end of the first motor. The side of the first threaded rod is threadedly engaged with the first limiting body.

[0012] Preferably, the sealing venting mechanism includes a second limiting groove formed on the upper end of the secondary support plate. A fifth motor is fixedly connected to the side of the secondary support plate. A second threaded rod is fixedly connected to the drive shaft end of the fifth motor in the second limiting groove. A second limiting body is provided on the side of the second threaded rod through threaded engagement. The side of the second limiting body is slidably engaged with the second limiting groove. A sixth electric telescopic rod is fixedly connected to the upper end of the second limiting body. A fifth fixing body is fixedly connected to the telescopic end of the sixth electric telescopic rod.

[0013] Preferably, the side of the fifth fixing body is an open structure, the side of the fifth fixing body is provided with a fifth slot, the fifth fixing body is fixedly connected to a third annular plate in the fifth slot, the side of the fifth fixing body is provided with an air inlet, and an air tank is fixedly connected to the side of the fifth fixing body near the air inlet.

[0014] Preferably, a sixth motor is fixedly connected to the side of the fifth fixing body, a seventh electric telescopic rod is fixedly connected to the drive shaft end of the sixth motor, and a grinding plate is fixedly connected to the telescopic ends of the seventh electric telescopic rod.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The second and sixth electric telescopic rods respectively drive the first and fifth fixed bodies to move into the holes on the side of the grid. Then, the two second motors start and drive the first grinding roller to rotate. When the first limiting body moves, the rotating first grinding roller can grind the side of the grid and remove the rotten and protruding wood. At the same time, the air pump starts and sucks out the gas in the third slot through the telescopic tube to suck out the debris generated when grinding the side of the grid, improve the fit between the side of the first annular plate and the inside of the grid, prevent light from entering, and improve the detection accuracy of the optical detector. The fourth motor drives the second grinding roller to rotate, and the rotating second grinding roller grinds the surface of the grid. Then the third motor starts, the third motor drives the gear to start, the gear drives the gear ring to start, thereby driving the rotating body to rotate. The rotating body drives the fixed plate to rotate through the fourth electric telescopic rod, thereby driving the second grinding roller to completely grind the surface of the pores. At the same time, the elastic support tube drives the side of the fourth fixed body to contact the surface of the pores. Then the air pump reduces the pressure inside the fourth fixed body through the support tube, thereby sucking out the impurities on the surface of the pores and inside the pores, so that the second optical detector on the side of the fixed plate can detect the gaps at the grid pores. The sixth motor drives the grinding plate to grind the inner side of the grid. At the same time, the third annular plate on the side of the fifth fixing body contacts the ground surface, improving the sealing between the fifth fixing body and the grid, preventing external light from affecting the detection, and improving the accuracy of the gap detection. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the entire invention. Figure 1 ; Figure 3 This is a cross-sectional view of the entire invention. Figure 2 ; Figure 4 This is a partial structural diagram of the present invention. Figure 1 ; Figure 5 This is a partial structural diagram of the present invention. Figure 2 ; Figure 6 For the present invention Figure 2 Enlarged view of point A; Figure 7 For the present invention Figure 4 Enlarged view of point B; Figure 8 For the present invention Figure 5 Enlarged view of point C; Figure 9 For the present invention Figure 5 Enlarged view of point D; Figure 10 For the present invention Figure 5 Enlarged view of point E.

[0017] 1. Main body plate; 2. Detection and grinding mechanism; 3. Sealing and venting mechanism; 11. Secondary support plate; 12. Clamping body; 13. First placement slot; 14. First electric telescopic rod; 21. First motor; 22. First limiting slot; 23. First limiting body; 24. First threaded rod; 25. Second electric telescopic rod; 26. First fixing body; 27. First annular plate; 28. First empty slot; 29. ​​Third electric telescopic rod; 210. Second empty slot; 211. Third empty slot; 212. Rotating slot; 213. Rotating body; 214. Fourth electric telescopic rod; 215. Telescopic tube; 216. Fixing plate; 217. Second fixing body; 218. Sixth empty slot; 219. Second placement slot; 220. Second motor; 2 21. First grinding roller; 222. First cavity; 223. Third motor; 224. Gear; 225. Gear ring; 226. Fifth electric telescopic rod; 227. Third fixed body; 228. Second cavity; 229. Fourth motor; 230. Second grinding roller; 231. Support tube; 232. Fourth fixed body; 233. Fourth slot; 234. Second annular plate; 31. Fifth motor; 32. Second limiting slot; 33. Second limiting body; 34. Second threaded rod; 35. Sixth electric telescopic rod; 36. Fifth fixed body; 37. Fifth slot; 38. Third annular plate; 39. Grinding plate; 310. Seventh electric telescopic rod; 311. Sixth motor; 312. Air inlet; 313. Air tank. Detailed Implementation

[0018] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0019] Please see Figure 1 - Figure 10 A crack detection device for building surfaces includes a main plate 1, with a detection and grinding mechanism 2 disposed at the upper end of the main plate 1. The detection and grinding mechanism 2 includes a first limiting groove 22 formed at the upper end of the main plate 1. In this embodiment, the main body plate 1 is slidably connected to a first limiting body 23 in a first limiting groove 22. A second electric telescopic rod 25 is fixedly connected to the upper end of the first limiting body 23. A first fixing body 26 is fixedly connected to the telescopic end of the second electric telescopic rod 25. A third slot 211 is opened on the side of the first fixing body 26. A first optical detector is arranged in the third slot 211 of the first fixing body 26. A first placement groove 13 is symmetrically opened on the side of the main body plate 1. A first electric telescopic rod 14 is fixedly connected to the main body plate 1 in the first placement groove 13. A secondary support plate 11 is fixedly connected to the telescopic ends of the two first electric telescopic rods 14. A clamping body 12 is fixedly connected to the upper ends of the main body plate 1 and the secondary support plate 11, respectively.

[0020] The first fixing body 26 has symmetrically opened first slots 28 on its side. The first fixing body 26 has a third electric telescopic rod 29 fixedly connected in the two first slots 28. The telescopic ends of the two third electric telescopic rods 29 are respectively fixedly connected to the second fixing body 217. The sides of the two second fixing bodies 217 are respectively opened with a sixth slot 218. The two second fixing bodies 217 are respectively opened with a second placement slot 219 communicating with the sixth slot 218. The two second fixing bodies 217 are respectively fixedly connected to the second placement slots 219. The drive shaft ends of the two second motors 220 are respectively fixedly connected to the first grinding roller 221.

[0021] The first fixing body 26 has a second slot 210 on its side. A flexible first annular plate 27 is fixedly connected to the first fixing body 26 in the second slot 210. A rotating slot 212 is provided on the side of the first fixing body 26. A rotating body 213 is rotatably connected to the first fixing body 26 in the rotating slot 212. An air pump communicating with the outside is provided at the end of the rotating body 213.

[0022] The rotating body 213 has a telescopic pipe 215 connected to the air pump fixedly connected to its side. The end of the telescopic pipe 215 is fixedly connected to a fixing plate 216. The end of the rotating body 213 is symmetrically connected to a fourth electric telescopic rod 214. The telescopic ends of the two fourth electric telescopic rods 214 are respectively fixedly connected to the end of the fixing plate 216. The side of the telescopic pipe 215 has several through holes. The side of the fixing plate 216 is provided with a second optical detector.

[0023] The end of the fixing plate 216 is an open structure. A fifth electric telescopic rod 226 is fixedly connected to the side of the fixing plate 216. A third fixing body 227 is fixedly connected to the telescopic end of the fifth electric telescopic rod 226. A second cavity 228 is opened on the side of the third fixing body 227. A fourth motor 229 is fixedly connected to the third fixing body 227 in the second cavity 228. A second grinding roller 230 is fixedly connected to the drive shaft end of the fourth motor 229.

[0024] A support tube 231 is provided on the side of the fixing plate 216. A fourth fixing body 232 is fixedly connected to the end of the support tube 231. One side of the fourth fixing body 232 is an opening structure that communicates with the support tube 231. A fourth slot 233 is provided on the side of the fourth fixing body 232. A flexible second annular plate 234 is provided in the fourth slot 233 of the fourth fixing body 232.

[0025] The first fixing body 26 has a first cavity 222 communicating with the rotating groove 212 on its side. A third motor 223 is fixedly connected to the first fixing body 26 in the first cavity 222. A gear 224 is fixedly connected to the drive shaft end of the third motor 223. A gear ring 225 that meshes with the gear 224 is fixedly connected to the side of the rotating body 213. A first motor 21 is fixedly connected to the side of the main body plate 1. A first threaded rod 24 is fixedly connected to the drive shaft end of the first motor 21. The side of the first threaded rod 24 is threadedly engaged with the first limiting body 23.

[0026] Specifically, the second motor 220 drives the first grinding roller 221 to rotate. When the first limiting body 23 moves, the rotating first grinding roller 221 can grind the side of the grid to remove the rotten and protruding wood. At the same time, the air pump starts and sucks out the gas in the third slot 211 through the telescopic tube 215 to suck out the debris generated when grinding the side of the grid, improve the fit between the side of the first annular plate 27 and the grid surface, prevent light from entering, and improve the detection accuracy of the optical detector.

[0027] In this embodiment, the upper end of the secondary support plate 11 is provided with a sealing air outlet mechanism 3 for sealing the inside of the grille.

[0028] The sealing venting mechanism 3 includes a second limiting groove 32 opened on the upper end of the secondary support plate 11. A fifth motor 31 is fixedly connected to the side of the secondary support plate 11. A second threaded rod 34 is fixedly connected to the drive shaft end of the fifth motor 31 in the second limiting groove 32. A second limiting body 33 is provided on the side of the second threaded rod 34 through threaded engagement. The side of the second limiting body 33 is slidably engaged with the second limiting groove 32. A sixth electric telescopic rod 35 is fixedly connected to the upper end of the second limiting body 33. A fifth fixing body 36 is fixedly connected to the telescopic end of the sixth electric telescopic rod 35.

[0029] The fifth fixing body 36 has an open structure on its side. The fifth fixing body 36 has a fifth slot 37 on its side. The fifth fixing body 36 has a third annular plate 38 fixedly connected in the fifth slot 37. The fifth fixing body 36 has an air inlet 312 on its side. The fifth fixing body 36 has an air tank 313 fixedly connected to its side near the air inlet 312.

[0030] A sixth motor 311 is fixedly connected to the side of the fifth fixed body 36. A seventh electric telescopic rod 310 is fixedly connected to the drive shaft end of the sixth motor 311. A grinding plate 39 is fixedly connected to the telescopic end of the seventh electric telescopic rod 310.

[0031] Specifically, the gas in the gas tank 313 is injected into the fifth fixed body 36, and then the sixth motor 311 is started. The sixth motor 311 drives the grinding plate 39 to grind the inner side of the grille. At the same time, the third annular plate 38 on the side of the fifth fixed body 36 comes into contact with the ground surface, improving the sealing between the fifth fixed body 36 and the grille.

[0032] In use, the upper surfaces of the main body plate 1 and the secondary support plate 11 are moved to the lower end of the grille. Then, the two first electric telescopic rods 14 are retracted. The two first electric telescopic rods 14 respectively drive the clamping bodies 12 at the upper ends of the main body plate 1 and the secondary support plate 11 to press and fix them against the sides of the grille. Then, the first motor 21 and the fifth motor 31 are started. The first motor 21 and the fifth motor 31 respectively drive the first threaded rod 24 and the second threaded rod 34 to rotate. The first threaded rod 24 and the second threaded rod 34 respectively drive the first limiting body 23 and the second limiting body 33 to reciprocate along the first limiting groove 22 and the second limiting groove 32. At the same time, the second electric telescopic rod 25 and the first... The six electric telescopic rods 35 respectively drive the first fixed body 26 and the fifth fixed body 36 to move into the holes on the side of the grid. Then, the two second motors 220 are started, and the second motors 220 respectively drive the first grinding roller 221 to rotate. When the first limiting body 23 moves, the rotating first grinding roller 221 can grind the side of the grid and remove the rotten and protruding wood. At the same time, the air pump is started. The air pump sucks out the gas in the third empty groove 211 through the telescopic pipe 215 to suck out the debris generated when grinding the side of the grid, improve the fit between the side of the first annular plate 27 and the inside of the grid, prevent light from entering, and improve the detection accuracy of the optical detector.

[0033] After the first fixing body 26 has completely polished the grid openings, the two fourth electric telescopic rods 214 extend, driving the fixing plate 216 to move to the openings. Then, the fifth electric telescopic rod 226 extends, causing the second polishing roller 230 on the side of the third fixing body 227 to contact the grid surface. Next, the fourth motor 229 starts, driving the second polishing roller 230 to rotate. The rotating second polishing roller 230 polishes the grid surface. Then, the third motor 223 starts, driving the gear 224 to start. The toothed ring 225 is activated, which in turn drives the rotating body 213 to rotate. The rotating body 213 drives the fixed plate 216 to rotate via the fourth electric telescopic rod 214, thereby driving the second grinding roller 230 to completely grind the surface of the pores. At the same time, the elastic support tube 231 drives the side of the fourth fixed body 232 to contact the surface of the pores. Then, the air pump reduces the pressure inside the fourth fixed body 232 through the support tube 231, thereby sucking out impurities from the surface and inside the pores. This makes it easier for the second optical detector on the side of the fixed plate 216 to detect the gaps at the grid pores, improving the accuracy of the detection.

[0034] During the grinding and inspection, the gas tank 313 on the side of the fifth fixed body 36 is opened, and the gas in the gas tank 313 is injected into the fifth fixed body 36. Then, the sixth motor 311 is started, and the sixth motor 311 drives the grinding plate 39 to grind the inner side of the grid. At the same time, the third annular plate 38 on the side of the fifth fixed body 36 comes into contact with the ground surface, improving the sealing between the fifth fixed body 36 and the grid, preventing external light from affecting the inspection, and improving the accuracy of the gap detection.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. 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 principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A crack detection device for building surfaces, comprising a main plate (1), characterized in that: The upper end of the main body plate (1) is provided with a detection and polishing mechanism (2). The detection and polishing mechanism (2) includes a first limiting groove (22) opened at the upper end of the main body plate (1). The main body plate (1) is slidably connected to a first limiting body (23) in the first limiting groove (22). The upper end of the first limiting body (23) is fixedly connected to a second electric telescopic rod (25). The telescopic end of the second electric telescopic rod (25) is fixedly connected to a first fixing body (26). A third slot (211) is opened on the side of the first fixing body (26). 26) A first optical detector is provided in the third slot (211). The main body plate (1) is symmetrically provided with a first placement slot (13). The main body plate (1) is fixedly connected with a first electric telescopic rod (14) in the first placement slot (13). The telescopic ends of the two first electric telescopic rods (14) are fixedly connected with a secondary support plate (11). The upper ends of the main body plate (1) and the secondary support plate (11) are fixedly connected with clamping bodies (12). The upper end of the secondary support plate (11) is provided with a sealing air outlet mechanism (3) for sealing the inside of the grille.

2. A crack detection device for a building surface according to claim 1, wherein: The first fixing body (26) has symmetrically opened first slots (28) on its side. The first fixing body (26) has a third electric telescopic rod (29) fixedly connected in the two first slots (28). The telescopic ends of the two third electric telescopic rods (29) are respectively fixedly connected to a second fixing body (217). The sides of the two second fixing bodies (217) are respectively opened with a sixth slot (218). The two second fixing bodies (217) are respectively opened with a second placement slot (219) communicating with the sixth slot (218). The two second fixing bodies (217) are respectively fixedly connected to a second motor (220) in the second placement slot (219). The drive shaft ends of the two second motors (220) are respectively fixedly connected to a first grinding roller (221).

3. The crack detection device for building surfaces according to claim 1, characterized in that: The first fixing body (26) has a second slot (210) on its side. A flexible first annular plate (27) is fixedly connected to the first fixing body (26) in the second slot (210). A rotating slot (212) is provided on the side of the first fixing body (26). A rotating body (213) is rotatably connected to the first fixing body (26) in the rotating slot (212). An air pump communicating with the outside is provided at the end of the rotating body (213).

4. A crack detection device for building surfaces according to claim 3, characterized in that: The rotating body (213) is fixedly connected to a telescopic pipe (215) communicating with an air pump. The end of the telescopic pipe (215) is fixedly connected to a fixing plate (216). The end of the rotating body (213) is symmetrically connected to a fourth electric telescopic rod (214). The telescopic ends of the two fourth electric telescopic rods (214) are respectively fixedly connected to the end of the fixing plate (216). The side of the telescopic pipe (215) is provided with several through holes. The side of the fixing plate (216) is provided with a second optical detector.

5. A crack detection device for building surfaces according to claim 4, characterized in that: The end of the fixing plate (216) is an open structure. A fifth electric telescopic rod (226) is fixedly connected to the side of the fixing plate (216). A third fixing body (227) is fixedly connected to the telescopic end of the fifth electric telescopic rod (226). A second cavity (228) is opened on the side of the third fixing body (227). A fourth motor (229) is fixedly connected to the third fixing body (227) in the second cavity (228). A second grinding roller (230) is fixedly connected to the drive shaft end of the fourth motor (229).

6. A crack detection device for building surfaces according to claim 4, characterized in that: A support tube (231) is provided on the side of the fixing plate (216). A fourth fixing body (232) is fixedly connected to the end of the support tube (231). One side of the fourth fixing body (232) is an opening structure that communicates with the support tube (231). A fourth slot (233) is provided on the side of the fourth fixing body (232). A flexible second annular plate (234) is provided in the fourth slot (233) of the fourth fixing body (232).

7. A crack detection device for building surfaces according to claim 3, characterized in that: The first fixing body (26) has a first cavity (222) communicating with the rotating groove (212) on its side. The first fixing body (26) has a third motor (223) fixedly connected in the first cavity (222). The transmission shaft end of the third motor (223) is fixedly connected to a gear (224). The side of the rotating body (213) is fixedly connected to a gear ring (225) meshing with the gear (224). The side of the main plate (1) is fixedly connected to a first motor (21). The transmission shaft end of the first motor (21) is fixedly connected to a first threaded rod (24). The side of the first threaded rod (24) is threadedly engaged with the first limiting body (23).

8. A crack detection device for building surfaces according to claim 1, characterized in that: The sealing venting mechanism (3) includes a second limiting groove (32) opened on the upper end of the secondary support plate (11). A fifth motor (31) is fixedly connected to the side of the secondary support plate (11). A second threaded rod (34) is fixedly connected to the transmission shaft end of the fifth motor (31) in the second limiting groove (32). A second limiting body (33) is provided on the side of the second threaded rod (34) through threaded engagement. The side of the second limiting body (33) is slidably engaged with the second limiting groove (32). A sixth electric telescopic rod (35) is fixedly connected to the upper end of the second limiting body (33). A fifth fixing body (36) is fixedly connected to the telescopic end of the sixth electric telescopic rod (35).

9. A crack detection device for building surfaces according to claim 8, characterized in that: The fifth fixing body (36) has an open structure on its side. The fifth fixing body (36) has a fifth slot (37) on its side. The fifth fixing body (36) has a third annular plate (38) fixedly connected in the fifth slot (37). The fifth fixing body (36) has an air inlet (312) on its side. The fifth fixing body (36) has an air tank (313) fixedly connected near the air inlet (312) on its side.

10. A crack detection device for building surfaces according to claim 9, characterized in that: The fifth fixed body (36) is fixedly connected to the side of a sixth motor (311), and the transmission shaft end of the sixth motor (311) is fixedly connected to a seventh electric telescopic rod (310). The telescopic ends of the seventh electric telescopic rod (310) are respectively fixedly connected to a grinding plate (39).

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