A device for detecting surface defects of building materials

Abstract

The present invention discloses a device for detecting surface defects of building materials, which belongs to the technical field of surface defect detection, and comprises a base component, wherein a recording component is connected with the base component by opening a card slot, a lifting component is threadedly connected with the middle part of the upper surface of the base component by opening two threaded holes, and a detection component is installed on one side of the base component; through the arranged recording component and detection component, the detection component can move at a uniform speed from left to right on the surface of a tile with complex texture and color changes, and during the movement, the moving mechanism inside the detection component will swing back and forth with a probe rod, thereby performing a comprehensive detection on the surface of the tile, and during the movement and swinging, the probe rod will record the travel trajectory on the surface of a recording plate on the lower surface of the frame, so that after the detection is completed, the recording plate can be removed and the recorded trajectory can be used to clearly judge whether the surface of the tile has defects.

Description

Technical Field

[0001] The invention relates to the technical field of surface defect detection, and in particular to a device for detecting surface defects of building materials. Background Art

[0002] Building materials are a general term for various materials used in civil engineering and construction engineering, and are an important material basis for buildings and structures. It includes not only the main structural materials that constitute the building, but also the auxiliary materials used in the construction of construction projects. There are many types of building materials, which can be classified differently according to their functions and chemical composition. From the perspective of function, building materials are mainly divided into building structural materials, wall materials and building functional materials. From the perspective of chemical composition, building materials are roughly divided into inorganic materials, organic materials and composite materials.

[0003] Building materials need to be inspected before use, especially ceramic tiles, which need to be inspected for defects on their surfaces. Existing inspection methods include touch inspection, visual inspection, and camera inspection.

[0004] The above detection method has a good effect on ordinary tiles, but for tiles with complex textures and color changes, visual inspection is still a basic method. However, due to the changes in texture and color, some subtle defects are not easy to be detected by the naked eye. For the visual inspection method, it is inevitable that incomplete touch and omissions may occur during the process. For the camera detection method, the characteristics of complex texture and color changes make it difficult to distinguish between defects and normal textures or colors, and it is difficult to accurately identify defects in complex textures. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that visual inspection is still a basic method for tiles with complex textures and color changes. However, due to the changes in texture and color, some subtle defects are not easily detected by the naked eye. For the visual inspection method, it is inevitable that incomplete touch and omissions may occur during the process. For the camera detection method, the characteristics of complex texture and color changes make it difficult to distinguish between defects and normal textures or colors, and it is difficult to accurately identify defects in complex textures. A building material surface defect detection device is proposed.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A device for detecting surface defects of building materials comprises a base assembly, a recording assembly is clamped on the base assembly, a lifting assembly is assembled on the base assembly, and a detection assembly is installed on one side of the base assembly;

[0008] The base assembly includes a base, a long groove is opened in the middle of the lower surface of the base, a screw rod is rotatably connected to the inside of the long groove through a first bearing, a motor is fixed to one end of the screw rod passing through the long groove, and an internal threaded tube is threadedly sleeved on the outer surface of the screw rod.

[0009] The detection assembly includes a sliding frame slidably connected to the base assembly, the sliding frame is fixed to the bottom of the internal threaded tube, both sides of the sliding frame are slidably sleeved with moving sleeves, the two moving sleeves are commonly fixed with a mounting box on opposite sides, the mounting box is slidably equipped with two retaining members and a probe rod inserted in the retaining members, and the two retaining members are commonly fixed with a moving mechanism on opposite sides;

[0010] The moving mechanism includes a moving frame fixed to two retaining members and a motor fixed to the middle of the inner bottom wall of the installation box, the output end of the motor is splined to a toothed shaft, and the middle of both inner side walls of the moving frame are fixed with racks meshing with the toothed shaft.

[0011] As a further description of the above technical solution:

[0012] A long groove is opened in the middle of the lower surface of the base, and the screw rod is rotatably connected in the long groove through a first bearing. Connecting pipes are fixed at the four corners of the lower surface of the base, and threaded column feet are threadedly connected in the four connecting pipes. The motor is detachably fixed to one side of the base.

[0013] As a further description of the above technical solution:

[0014] The lifting assembly includes a table plate and two threaded rods threadedly connected to the base, the top ends of the two threaded rods are rotatably connected to the lower surface of the table plate through second bearings, and retaining columns are fixed at the four corners of the lower surface of the table plate. The four retaining columns are respectively arranged at the four corners of the upper surface of the base.

[0015] As a further description of the above technical solution:

[0016] Pulleys are fixed at the bottom ends of the two threaded rods, and belts are engaged with the two pulleys to rotate the two threaded rods simultaneously. Circular grooves for assembling the second bearing are provided on both sides of the lower surface of the table, and a turntable for driving it to rotate is fixed at the bottom of one of the pulleys.

[0017] As a further description of the above technical solution:

[0018] The recording component includes a frame that is snap-connected to a card slot, an ink storage box is slidably mounted on the middle part of one side of the upper surface of the frame through a through slot, a box cover is detachably fixed to the ink storage box, an ink-absorbing sponge is snap-connected to the inside of the ink storage box, a level bubble for observing whether the device is level is embedded in the middle part of the upper surface of the frame, and a recording board is adhered to the lower surface of the frame.

[0019] As a further description of the above technical solution:

[0020] Mounting plates are fixed at both ends of the upper surface of the frame close to the ink cartridge, a plurality of first return springs are fixed to the lower surface of the mounting plates, the other ends of the plurality of first return springs are fixed to the upper surface of the box cover, long ink absorbing grooves corresponding to the probe rod are provided on both sides of the inner bottom wall of the ink cartridge, and a sealing strip is rotatably connected to the interior of the ink absorbing groove via a spring hinge.

[0021] As a further description of the above technical solution:

[0022] The probe rod includes a main rod and a mounting seat fixed to the top end of the main rod, a plurality of holding cavities are provided inside the retaining member, the main rod is inserted into the holding cavity, an ink storage groove is provided inside the mounting seat, an ink storage sponge is inserted into the ink storage groove, a rotatable writing bead is embedded in the top of the inner cavity of the ink storage groove, and a plurality of ink inlet grooves distributed in a circular array are provided on the top of the inner wall of the ink storage groove.

[0023] As a further description of the above technical solution:

[0024] A base is fixed to the bottom end of the main rod, and the bottom end of the base is rotatably connected to a ball joint via a ball groove. A detection head is fixed at the axis of the bottom of the ball joint. Four guide grooves distributed in a circular array are provided at the bottom of the outer wall of the base. A baffle rod for resisting the detection head to keep it vertical is rotatably connected to the inside of the guide groove via a rotating shaft. Torsion springs for driving the baffle rod to return to a vertical state after rotation are jointly sleeved on both sides of the outer surface of the rotating shaft.

[0025] As a further description of the above technical solution:

[0026] Two vertical slide bars are fixed on the outer wall of the main rod for making it slide in the retaining cavity, and the bottom ends of the two vertical slide bars are fixed with second return springs. The two side walls of the retaining cavity are provided with slideways adapted to the vertical slide bars for limiting the sliding position of the main rod.

[0027] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0028] By setting up a recording component and a detection component, the detection component can move at a constant speed from left to right on the surface of a tile with complex textures and color changes. During the movement, the moving mechanism inside it will swing the probe rod back and forth, thereby performing a comprehensive detection of the tile surface. During the movement and swinging process, the probe rod will record the travel trajectory on the surface of the recording board on the lower surface of the frame, so that after the detection is completed, the recording board can be removed and the recorded trajectory can be used to clearly determine whether there are defects on the tile surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of a first viewing angle provided by an embodiment of the present invention is shown;

[0030] Figure 2 A schematic diagram of the structure of a second viewing angle provided according to an embodiment of the present invention is shown;

[0031] Figure 3 A schematic diagram of structural splitting provided according to an embodiment of the present invention is shown;

[0032] Figure 4 A schematic diagram of a first viewing angle of an installation box provided by an embodiment of the present invention is shown;

[0033] Figure 5 A schematic diagram showing a second viewing angle of the installation box provided by an embodiment of the present invention is shown;

[0034] Figure 6 A schematic diagram showing the disassembly of the installation box structure provided in an embodiment of the present invention is shown;

[0035] Figure 7 A schematic diagram showing the disassembly of the probe rod structure according to an embodiment of the present invention is shown;

[0036] Figure 8 A schematic diagram of a base provided according to an embodiment of the present invention is shown;

[0037] Fig. 9 The embodiment of the present invention provides Figure 1 The enlarged schematic diagram at A in the middle;

[0038] Fig.10 The embodiment of the present invention provides Figure 3 The enlarged schematic diagram at B in the middle;

[0039] Fig.11 The embodiment of the present invention provides Figure 5 The enlarged schematic diagram at C in the middle;

[0040] Fig.12 The embodiment of the present invention provides Figure 6 Schematic diagram of the enlarged view at D in the middle.

[0041] Legend:

[0042] 10. Base assembly; 11. Base; 12. Threaded column foot; 13. Screw rod; 14. Motor;

[0043] 20. Recording assembly; 21. Frame; 22. Ink storage box; 23. Ink absorbing sponge; 24. First return spring; 25. Sealing strip; 26. Level bubble; 27. Recording board;

[0044] 30. lifting assembly; 31. table; 32. threaded rod; 33. belt; 34. turntable;

[0045] 40. Detection assembly; 41. Sliding frame; 42. Moving sleeve; 43. Mounting box; 44. Retaining member; 45. Moving mechanism; 46. Probe rod;

[0046] 461, main rod; 462, mounting seat; 463, ink storage tank; 464, ink storage sponge; 465, writing bead; 466, base; 467, ball joint; 468, detection head; 469, stop rod; 4610, torsion spring; 4611, vertical slide bar;

[0047] 451. Moving frame; 452. Motor; 453. Geared shaft. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] like Figure 1 - Fig.12 As shown, the present invention provides: a building material surface defect detection device includes a base assembly 10, a recording assembly 20 is clamped on the base assembly 10, a lifting assembly 30 is assembled on the base assembly 10, and a detection assembly 40 is installed on one side of the base assembly 10;

[0050] The base assembly 10 includes a base 11, a long groove is opened in the middle of the lower surface of the base 11, a screw rod 13 is rotatably connected to the inside of the long groove through a first bearing, a motor 14 is fixed to one end of the screw rod 13 that passes through the long groove, and an internal threaded tube is threadedly sleeved on the outer surface of the screw rod 13.

[0051] The detection component 40 includes a sliding frame 41 slidably connected to the base component 10, the sliding frame 41 is fixed to the bottom of the internal threaded tube, and moving sleeves 42 are slidably sleeved on both sides of the sliding frame 41, and a mounting box 43 is fixed to the opposite side of the two moving sleeves 42, and two retaining members 44 and a probe rod 46 inserted in the retaining members 44 are slidably assembled in the mounting box 43, and a moving mechanism 45 is fixed to the opposite side of the two retaining members 44, and preferably, a knob bolt is threaded through the side surface of the moving sleeve 42, and after the moving sleeve 42 moves to the position, the knob bolt is rotated to make its end abut against the outer wall of the sliding frame 41, thereby fixing the position of the moving sleeve 42;

[0052] The moving mechanism 45 includes a moving frame 451 fixed to the two retaining members 44 and a motor 452 fixed to the middle of the inner bottom wall of the installation box 43. The output end of the motor 452 is spline-connected with a gear shaft 453. The middle of the two inner side walls of the moving frame 451 are fixed with racks meshing with the gear shaft 453. When the installation box 43 moves following the internal threaded tube, the motor 452 can drive the gear shaft 453 to rotate, thereby causing the moving frame 451 to move back and forth, thereby driving the two retaining members 44 to move back and forth. The two retaining members 44 are staggered, so that the surface of the patterned ceramic tile can be fully inspected. After moving, the surface of the ceramic tile can be fully inspected, and the inspection is more detailed.

[0053] like Figure 2 and Figure 3 The base assembly 10 includes a base 11, a long groove is provided in the middle of the lower surface of the base 11, a screw rod 13 is rotatably connected in the long groove through a first bearing, connecting pipes are fixed at the four corners of the lower surface of the base 11, and threaded column feet 12 are threadedly connected in the four connecting pipes. The motor 14 is detachably fixed to one side of the base 11. Preferably, two transverse grooves are provided on the outer wall of the base 11, and two guide sliders adapted to the transverse grooves are fixed to the inner bottom of the slide frame 41. The slide frame 41 is slidably connected to the transverse groove through the guide slider, so that the slide frame 41 can slide on the outer wall of the base 11 along the transverse groove.

[0054] like Figure 2 , Figure 3 and Fig.10 The recording assembly 20 includes a frame 21 that is snapped into the card slot, an ink cartridge 22 is slidably mounted in the middle of one side of the upper surface of the frame 21 through a through slot, a cover is detachably fixed to the ink cartridge 22, an ink absorbing sponge 23 is snapped into the interior of the ink cartridge 22, a level bubble 26 for observing whether the device is level is embedded in the middle of the upper surface of the frame 21, and a recording board 27 is attached to the lower surface of the frame 21;

[0055] Preferably, the recording board 27 is a foam board, the surface of which is flat and level and can be easily penetrated by the pen tip;

[0056] Mounting plates are fixed at both ends of the upper surface of the frame 21 close to the ink storage box 22, and a plurality of first return springs 24 are fixed to the lower surface of the mounting plates. The other ends of the plurality of first return springs 24 are fixed to the upper surface of the box cover. Long ink absorbing grooves corresponding to the probe rod 46 are provided on both sides of the inner bottom wall of the ink storage box 22. A sealing strip 25 is rotatably connected to the interior of the ink absorbing groove via a spring hinge. Preferably, a sealing ring is provided on the sealing strip 25 for improving the sealing between the sealing strip 25 and the ink absorbing groove when not in use, so as to avoid ink dripping downwards when not in use.

[0057] like Figure 2 The lifting assembly 30 includes a table plate 31 and two threaded rods 32 threadedly connected to the base 11. The top ends of the two threaded rods 32 are rotatably connected to the lower surface of the table plate 31 through second bearings. Retaining columns are fixed at the four corners of the lower surface of the table plate 31. The four retaining columns are respectively penetrated at the four corners of the upper surface of the base 11. Pulleys are fixed to the bottom ends of the two threaded rods 32. The two pulleys are jointly engaged with a belt 33 for rotating the two threaded rods 32 at the same time. Circular grooves for assembling the second bearings are opened on both sides of the lower surface of the table plate 31. A turntable 34 for driving it to rotate is fixed at the bottom of one of the pulleys. Preferably, anti-slip grooves are engraved on the outer wall of the turntable 34 to facilitate personnel to rotate the turntable 34. By rotating the turntable 34 clockwise and with the cooperation of the pulley and the belt 33, the two threaded rods 32 rotate synchronously and gradually move upward, thereby pushing the base 11 to rise to the surface of the patterned tile on its surface in contact with the bottom end of the probe rod 46.

[0058] like Figure 7 and Figure 8 The probe rod 46 includes a main rod 461 inserted into the holding cavity and a mounting seat 462 fixed to the top of the main rod 461. An ink storage groove 463 is provided inside the mounting seat 462. An ink storage sponge 464 is inserted inside the ink storage groove 463. A rotatable writing bead 465 is embedded at the top of the inner cavity of the ink storage groove 463. A plurality of ink inlet grooves distributed in a circular array are provided at the top of the inner wall of the ink storage groove 463. Before the detection, the ink storage box 22 is pressed downward to make the mounting seat 462 rotate inward through the sealing strip 25, so that the mounting seat 462 enters the inner cavity of the ink storage box 22 and abuts against the ink absorbing sponge 23 storing ink. At this time, the ink will flow into the ink storage groove 463 through the ink inlet groove and be absorbed and stored by the ink storage sponge 464. In the process of walking, the writing bead 465 rolls and the ink will adhere to its surface to write the travel trajectory.

[0059] A base 466 is fixed to the bottom end of the main rod 461, and a ball joint 467 is rotatably connected to the bottom end of the base 466 through a ball groove. A detection head 468 is fixed to the axis of the bottom of the ball joint 467. Four guide grooves distributed in a circular array are opened at the bottom of the outer wall of the base 466. A stopper 469 for resisting the detection head 468 to keep it vertical is rotatably connected to the inside of the guide groove through a rotating shaft. Torsion springs 4610 for driving the stopper 469 to return to a vertical state after rotation are jointly sleeved on both sides of the outer surface of the rotating shaft. Two vertical slide bars 4611 for sliding in the cavity are fixed to the outer wall of the main rod 461. A second reset spring is fixed to the bottom end of the vertical slide bar 4611, and both side walls of the cavity are provided with slideways that are compatible with the vertical slide bar 4611 and are used to limit the sliding position of the main rod 461. The bottom end of the second reset spring is fixed to the inner bottom wall of the slideway. When the detection head 468 goes deep into the recess and cannot be gradually moved out of the recess by itself due to the arc surface at its bottom during the movement, the detection head 468 can be rotated left and right or forward and backward according to the movement needs, and then move out of the recess. After moving out, it is driven by the torsion spring 4610 to restore the vertical state, and then continue to detect the tile surface through its end.

[0060] Specifically, when the building material surface defect detection device is working / in use:

[0061] First, place the base assembly 10 on a flat surface, then place the tile to be tested on the surface of the table 31, then snap the recording assembly 20 onto the surface of the base 11 and observe whether the device is level at this time through the level bubble 26. If it is not level, rotate the four threaded column feet 12 to make the bubble in the level bubble 26 in the middle position, so that the device is adjusted to a horizontal state;

[0062] At this time, the ink storage box 22 is pressed downward to make it approach the top of the probe rod 46. During the continuous downward movement, the top of the probe rod 46 pushes the sealing strip 25 to flip inward, so that the top of the probe rod 46 extends into the inner cavity of the ink storage box 22 and contacts the ink absorbing sponge 23. The ink in the ink absorbing sponge 23 enters the ink storage tank 463 through the multiple ink inlet grooves opened at the top of the inner wall of the ink storage tank 463. The ink entering the ink storage tank 463 is absorbed and stored by the ink storage sponge 464, and the ink storage sponge 464 contacts the writing bead 465 and can transfer the ink to the surface of the writing bead 465. After the ink storage is completed, the pressing state of the ink storage box 22 is released, and the ink storage box 22 is driven to reset upward under the action of the restoring force of the first reset spring 24. Both ends of the first reset spring 24 are provided with buffer pads, which can buffer the opposite force.

[0063] Then, the motor 14 is started to drive the screw rod 13 to rotate clockwise, so that the internal threaded tube moves with the detection assembly 40 from right to left, so that the bottom end of the probe rod 46 moves to the upper position of one end of the tile. At this time, the motor 14 is turned off, and then the turntable 34 is turned to rotate the pulley connected to it, and the pulley drives another pulley to rotate synchronously through the belt 33, so that the two threaded rods 32 rotate together, and the thrust generated by the upward movement of the two threaded rods 32 pushes the table 31 to move upward, so that the tiles on its surface contact with the bottom of the detection head 468;

[0064] Then, the motor 14 is started again to rotate the screw rod 13 clockwise, driving the detection assembly 40 to move from right to left on the tile surface. While moving, the motor 452 is started to rotate the gear shaft 453. The gear shaft 453 will mesh with the rack on one side wall of the moving frame 451 during the rotation process. After rotating to the other side, it will mesh with the rack on the other side wall of the moving frame 451. In this way, the moving frame 451 can reciprocate with the two retaining members 44, so that the probe rod 46 can move forward and backward while moving from right to left. During the movement, the writing bead 465 can write the trajectory on the recording board 27.

[0065] After the test is completed, the recording board 27 is removed. According to the recorded track, it can be clearly seen whether there are defects on the surface of the tile. When the track is disconnected, it means that the tile is concave at that place. When the recording board 27 is punctured at a certain place, it means that the tile is convex at that place. When the track fluctuates and is not smooth, it means that the tile has cracks at that place. The probe rod 46 moves back and forth, and can also show the specific size of the approximate depression, convexity, and crack. At the same time, if there are no defects on the surface of the tile, the track will be smooth as a whole.

[0066] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for detecting surface defects of building materials, comprising a base assembly (10), characterized in that: The base assembly (10) is clamped with a recording assembly (20), the base assembly (10) is equipped with a lifting assembly (30), and a detection assembly (40) is installed on one side of the base assembly (10); The base assembly (10) comprises a base (11), a long groove is provided in the middle of the lower surface of the base (11), a screw rod (13) is rotatably connected to the interior of the long groove via a first bearing, a motor (14) is fixed to one end of the screw rod (13) passing through the long groove, and an internally threaded tube is provided on the outer surface of the screw rod (13). The detection assembly (40) comprises a sliding frame (41) slidably connected to the base assembly (10), the sliding frame (41) being fixed to the bottom of the internally threaded tube, and moving sleeves (42) are slidably sleeved on both sides of the sliding frame (41), and a mounting box (43) is fixed to the opposite sides of the two moving sleeves (42), and two retaining members (44) and a probe rod (46) inserted into the retaining members (44) are slidably mounted in the mounting box (43), and a moving mechanism (45) is fixed to the opposite sides of the two retaining members (44); The moving mechanism (45) comprises a moving frame (451) fixed to two retaining members (44) and a motor (452) fixed to the middle of the inner bottom wall of the installation box (43); the output end of the motor (452) is spline-connected to a toothed shaft (453); and racks meshing with the toothed shaft (453) are fixed to the middle of both inner side walls of the moving frame (451); The recording assembly (20) comprises a frame (21) snapped into the slot, an ink cartridge (22) is slidably mounted in the middle of one side of the upper surface of the frame (21) via a through slot, a cover is detachably fixed to the ink cartridge (22), an ink absorbing sponge (23) is snapped into the interior of the ink cartridge (22), a level bubble (26) for observing whether the device is level is embedded in the middle of the upper surface of the frame (21), and a recording board (27) is attached to the lower surface of the frame (21); The probe rod (46) comprises a main rod (461) and a mounting seat (462) fixed to the top end of the main rod (461); a plurality of holding cavities are provided inside the holding member (44); the main rod (461) is inserted into the holding cavities; an ink storage groove (463) is provided inside the mounting seat (462); an ink storage sponge (464) is inserted into the ink storage groove (463); a rotatable writing bead (465) is embedded in the top of the inner cavity of the ink storage groove (463); and a plurality of ink inlet grooves distributed in a ring array are provided on the top of the inner wall of the ink storage groove (463); A base (466) is fixed to the bottom end of the main rod (461), and the bottom end of the base (466) is rotatably connected to a ball joint (467) via a ball groove. A detection head (468) is fixed at the axis of the bottom of the ball joint (467). Four guide grooves distributed in a circular array are opened at the bottom of the outer wall of the base (466). A stopper (469) for resisting the detection head (468) to keep it vertical is rotatably connected to the inside of the guide groove via a rotating shaft. Torsion springs (4610) for driving the stopper (469) to return to a vertical state after rotation are jointly sleeved on both sides of the outer surface of the rotating shaft.

2. A building material surface defect detection device according to claim 1, characterized in that: A long groove is provided in the middle of the lower surface of the base (11), and the screw rod (13) is rotatably connected to the long groove via a first bearing. Connecting pipes are fixed at the four corners of the lower surface of the base (11), and threaded column feet (12) are threadedly connected in the four connecting pipes. The motor (14) is detachably fixed to one side of the base (11).

3. A building material surface defect detection device according to claim 1, characterized in that: The lifting assembly (30) comprises a platform (31) and two threaded rods (32) threadedly connected to the base (11), the top ends of the two threaded rods (32) being rotatably connected to the lower surface of the platform (31) via second bearings, retaining columns are fixed at the four corners of the lower surface of the platform (31), and the four retaining columns are respectively arranged at the four corners of the upper surface of the base (11).

4. A building material surface defect detection device according to claim 3, characterized in that: Pulleys are fixed at the bottom ends of the two threaded rods (32), and a belt (33) is meshed with the two pulleys for rotating the two threaded rods (32) simultaneously. Circular grooves for assembling a second bearing are provided on both sides of the lower surface of the table (31), and a turntable (34) for driving the rotation of one of the pulleys is fixed at the bottom.

5. A building material surface defect detection device according to claim 1, characterized in that: Mounting plates are fixed at both ends of the upper surface of the frame (21) close to the ink storage box (22), and a plurality of first return springs (24) are fixed to the lower surface of the mounting plate. The other ends of the plurality of first return springs (24) are fixed to the upper surface of the box cover. Long ink absorbing grooves corresponding to the probe rod (46) are formed on both sides of the inner bottom wall of the ink storage box (22), and the interior of the ink absorbing groove is rotatably connected to a sealing strip (25) via a spring hinge.

6. A building material surface defect detection device according to claim 1, characterized in that: Two vertical slide bars (4611) are fixed on the outer wall of the main rod (461) for enabling it to slide in the retaining cavity, and a second return spring is fixed at the bottom end of the two vertical slide bars (4611). Both side walls of the retaining cavity are provided with slideways adapted to the vertical slide bars (4611) for limiting the sliding position of the main rod (461).

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