Automatic crack recognition device for autoclaved aerated concrete slabs based on machine vision

Abstract

The present invention belongs to the technical field of concrete slab detection, and particularly relates to an automatic crack recognition device for autoclaved aerated concrete slabs based on machine vision, which includes a frame. Inside the frame, a sprocket-type multi-roller plate feeder is installed. Below the sprocket-type multi-roller plate feeder, there is a layer cavity, and a matrix multi-point plate lifting assembly is installed inside the layer cavity. At a position near the feeding end above the frame, a centering assembly is installed. Right-angle auxiliary frames are fixedly connected to both sides of the frame, and bilateral belt pulley traction assemblies are arranged on both right-angle auxiliary frames. A cross beam is arranged on the bilateral belt pulley traction assembly. Above the cross beam, a gear walking assembly is arranged, and a double-sided vision detection assembly is arranged on the gear walking assembly. The present invention can replace manual labor to realize the two-sided detection of autoclaved aerated concrete slabs, and significantly improve the reliability of quality detection.

Description

Technical Field

[0001] The present invention belongs to the technical field of autoclaved aerated concrete slab detection, and particularly relates to an automatic crack recognition device for autoclaved aerated concrete slabs based on machine vision. Background Art

[0002] Autoclaved aerated concrete slabs are a kind of lightweight and porous new type of green building material mainly made of cement, lime, silica sand, etc., and different numbers of anti-corrosion treated steel mesh sheets are configured according to structural requirements. After being cured under high temperature, high pressure and steam, autoclaved aerated concrete slabs with porous crystals are produced. Their density is smaller than that of general cementitious materials, and they have excellent fire resistance, fireproofing, sound insulation, heat insulation, heat preservation and other unparalleled properties. After the autoclaved aerated concrete slabs are manufactured, in order to ensure their performance during use, various tests need to be carried out on the autoclaved aerated concrete slabs, including the detection of apparent cracks on the autoclaved aerated concrete slabs.

[0003] An automatic crack recognition device for autoclaved aerated concrete slabs disclosed in the invention patent with the application number CN202410875733.3 includes a base, a width adjustment component, electric universal wheels, a PLC controller, a concrete surface crack depth tester body, a plurality of fixing parts, at least one detection head and a storage battery. The width adjustment component is arranged at the bottom of the base; the electric universal wheels are respectively arranged at the four corners of the width adjustment component; the PLC controller is respectively connected with the width adjustment component, the electric universal wheels and the concrete surface crack depth tester body; the fixing parts are evenly arranged on the top of the width adjustment component, and it moves the base through the electric universal wheels for detection. Workers can clearly understand the apparent crack situation of the autoclaved aerated concrete slab by observing the concrete surface crack depth tester body.

[0004] However, the above technical solution can only perform detection operations on the upper surface of the autoclaved aerated concrete slab. That is, when the slab passes through the detection station, due to the occlusion of the mechanical support structure, the other side surface cannot be captured synchronously. And the existing conveying systems mostly adopt single-layer multi-roller conveying, and the bottom surface of the slab is always in contact with the conveyor belt and the conveying rollers, resulting in no effective imaging space for this contact surface of the autoclaved aerated concrete slab. If bottom surface detection is to be achieved, it is necessary to flip through a robotic arm or set up a special flipping station, which not only interrupts the production rhythm but also may cause secondary damage to the concrete slab due to mechanical contact. Some improved solutions that attempt to use a transparent conveyor belt can solve the bottom surface imaging problem, but face new problems such as the deterioration of imaging quality caused by the wear of the transparent conveyor belt surface. Summary of the Invention

[0005] The main technical problem to be solved by the present invention is to provide an automatic crack identification device for autoclaved aerated concrete slabs based on machine vision, which can replace manual inspection to realize double-sided inspection of autoclaved aerated concrete slabs and significantly improve the reliability of quality inspection.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] The automatic identification device for cracks of autoclaved aerated concrete slabs based on machine vision includes a frame, a sprocket-type multi-roller plate feeder for conveying autoclaved aerated concrete slabs is installed inside the frame, a layer cavity is arranged below the sprocket-type multi-roller plate feeder, a matrix multi-point lifting assembly for upward lifting the autoclaved aerated concrete slabs is installed in the layer cavity, and a detection station is located above the matrix multi-point lifting assembly. A centering assembly is installed above the frame near the feed end, right-angle sub-frames are fixed on both sides of the frame, and double-sided pulley traction assemblies are arranged on the two right-angle sub-frames, and a crossbeam is arranged on the double-sided pulley traction assembly, which can drive the crossbeam to move in the vertical direction of feeding, and a gear walking assembly is arranged above the crossbeam, and a double-sided visual inspection assembly for visually inspecting cracks of the lifted autoclaved aerated concrete slabs is arranged on the gear walking assembly, and the gear walking assembly can drive the double-sided visual inspection assembly to move along the feeding direction.

[0008] The following is a further optimization of the above technical solution by the present invention:

[0009] The sprocket-type multi-roller plate feeder includes multiple rubber rollers, which are arranged in parallel at a certain distance along the feeding direction. The rubber rollers are rotatably installed in the frame. The same end of the multiple rubber rollers is provided with an X-axis sprocket transmission mechanism for ensuring their synchronous rotation. A stepper motor is installed on the frame, and the output end of the stepper motor is connected to any rubber roller for transmission.

[0010] Further optimization: The matrix multi-point lifting plate assembly includes multiple lifting components arranged in the layer cavity, and a hollow axle box is provided at the same end of the multiple lifting components. The hollow axle box is fixedly connected to the bottom of the frame, and a Y-axis sprocket transmission mechanism for driving the multiple lifting components to move synchronously is provided in the hollow axle box. A reduction motor is fixedly installed on the hollow axle box, and the output end of the reduction motor is connected to the Y-axis sprocket transmission mechanism.

[0011] Further optimization: the lifting assembly includes at least two worm gear screw lifts, which are fixedly installed on the frame. A silicone disc is fixed to the top of the screw of the worm gear screw lift. The worm shaft of the worm gear screw lift is connected through a transmission shaft. The transmission shaft is connected to the frame for rotation. The transmission shaft is connected to the Y-axis sprocket transmission mechanism. The lifting assembly is arranged in parallel between two adjacent rubber rollers.

[0012] Further optimization: The double-sided pulley traction assembly includes two pulley linear modules, which are fixedly mounted on the top surface of the right-angle sub-frame and symmetrically arranged at a certain distance. The two pulley linear modules are connected through a connecting shaft. A belt drive unit is fixedly mounted on the right-angle sub-frame, and the belt drive unit is connected to the connecting shaft for driving the connecting shaft to rotate.

[0013] Further optimization: The gear travel assembly includes an L-shaped slide slidably connected to the crossbeam, a helical rack is fixedly connected to the crossbeam, and a gear drive unit is provided on the L-shaped slide.

[0014] Further optimization: the gear drive unit includes a second servo motor fixedly mounted on the L-shaped slide, the output end of the second servo motor is transmission-connected to a driving gear disc, and the driving gear disc is meshed with the helical rack.

[0015] Further optimization: The double-sided visual inspection assembly includes two horizontally arranged frames fixed on an L-shaped slide. The two frames are arranged at a certain distance from each other. A CCD camera is fixedly installed on each frame, and the CCD cameras installed on the upper and lower frames are arranged symmetrically.

[0016] Further optimization: The centering assembly includes two brackets symmetrically arranged at a certain distance. The brackets are fixed to the top of the frame near the feed end. Each bracket is rotatably connected to two rotating shafts. A push plate is fixed to both rotating shafts. A crank arm is fixed to any one of the rotating shafts. A hydraulic cylinder is hinged on the bracket, and the piston rod of the hydraulic cylinder is hinged to the end of the crank arm away from the rotating shaft.

[0017] Further optimization: A PLC control panel is installed on the rack.

[0018] The beneficial effects of the present invention are as follows: Through the middle assembly and the sprocket-type multi-roller sheet feeder, the autoclaved aerated concrete board is stably sent to the double-sided vision inspection station. After the autoclaved aerated concrete board reaches the inspection station, the matrix multi-point lifting plate assembly lifts the board upward and makes it suspended in the air. Then, the double-sided pulley traction assembly moves the double-sided vision inspection assembly to the position of the autoclaved aerated concrete board, and the gear walking assembly drives the double-sided vision inspection assembly to move along the board conveying direction until the upper and lower surfaces of the board are synchronously visually inspected. After the inspection is completed, the double-sided vision inspection assembly returns to its original position in space, and the autoclaved aerated concrete board descends and is sent out by the sprocket-type multi-roller sheet feeder; among them, the matrix multi-point lifting plate assembly adopts a surface contact type lifting structure, which evenly disperses mechanical stress while ensuring the stable suspension of the board, avoiding the generation of micro-cracks caused by local pressure concentration. The mobile scanning mechanism of the double-sided vision inspection assembly and the gear walking assembly replaces the fixed-station inspection mode. During the inspection process, there is no need to clamp or flip the board, fundamentally eliminating surface scratches and edge damage caused by mechanical contact. The implementation of this non-contact inspection concept not only maintains the appearance integrity of the autoclaved aerated concrete board product but also avoids new defects introduced by the inspection operation, significantly improving the reliability of quality inspection;

[0019] Through the action control of the centering assembly and the sprocket-type multi-roller sheet feeder, the accurate matching of the incoming board positioning and the conveying rhythm is realized, ensuring continuous feeding at the inspection station. The automatic lowering and sending mechanism of the board after the inspection is completed enables seamless connection between quality determination and logistics transfer;

[0020] When the inspection assembly moves along the board conveying direction, the precise transmission of the gear walking assembly ensures the constant distance relationship between the double-sided vision inspection assembly and the board surface. Moreover, the board in the suspended state gets rid of the contact constraint of the conveyor belt support surface, enabling the bottom surface inspection to obtain an unobstructed complete field of view and clearly capture the double-sided morphological characteristics of the through cracks in the concrete board.

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments. Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of the overall structure of another perspective of an embodiment of the present invention;

[0024] Figure 3 It is a schematic front view structure of an embodiment of the present invention;

[0025] Figure 4 It is a schematic diagram of the overall structure of yet another perspective of an embodiment of the present invention;

[0026] Figure 5It is a schematic structural diagram of the centering assembly in the embodiment of the present invention;

[0027] Figure 6 It is a schematic structural diagram of the matrix multi-point lifting plate assembly in the embodiment of the present invention;

[0028] Figure 7 It is a schematic structural diagram of the double-sided belt pulley traction assembly in the embodiment of the present invention;

[0029] Figure 8 It is a schematic structural diagram of the gear walking assembly in the embodiment of the present invention.

[0030] In the figure: 1 - frame; 101 - layer cavity; 2 - sprocket type multi-roller plate feeder; 201 - rubber roller; 202 - X-axis sprocket drive mechanism; 203 - stepper motor; 3 - matrix multi-point lifting plate assembly; 301 - hollow axle box; 302 - transmission shaft; 303 - Y-axis sprocket drive mechanism; 304 - worm screw lift; 305 - reduction motor; 306 - silica gel plate; 4 - centering assembly; 401 - bracket; 402 - longitudinal connecting beam; 403 - hydraulic cylinder; 404 - rotating shaft; 405 - push plate; 406 - crank arm; 5 - PLC control panel; 6 - right-angle sub-frame; 7 - double-sided belt pulley traction assembly; 701 - belt pulley linear module; 702 - connecting shaft; 703 - belt drive unit; 8 - cross beam; 9 - gear walking assembly; 901 - L-shaped sliding frame; 902 - inclined rack; 903 - gear drive unit; 10 - double-sided vision detection assembly; 1001 - lying frame; 1002 - CCD camera. Detailed implementation manners

[0031] As Figure 1-8 shown, the automatic crack recognition device for autoclaved aerated concrete slabs based on machine vision includes a frame 1. Inside the frame 1, a sprocket type multi-roller plate feeder 2 for transporting autoclaved aerated concrete slabs is installed. Below the sprocket type multi-roller plate feeder 2, there is a layer cavity 101. Inside the layer cavity 101, a matrix multi-point lifting plate assembly 3 for lifting the autoclaved aerated concrete slabs upward is installed. Above the matrix multi-point lifting plate assembly 3 is the detection station. Near the feeding end above the frame 1, a centering assembly 4 is installed. Right-angle sub-frames 6 are fixedly connected to both sides of the frame 1. Double-sided belt pulley traction assemblies 7 are arranged on both right-angle sub-frames 6. A cross beam 8 is arranged on the double-sided belt pulley traction assembly 7. The double-sided belt pulley traction assembly 7 can drive the cross beam 8 to move in the vertical direction of the material transportation. Above the cross beam 8, there is a gear walking assembly 9. On the gear walking assembly 9, a double-sided vision detection assembly 10 for visually detecting cracks in the lifted autoclaved aerated concrete slabs is arranged. The gear walking assembly 9 can drive the double-sided vision detection assembly 10 to move in the material transportation direction.

[0032] Set the conveying direction of the autoclaved aerated concrete board as the X-axis direction, the direction perpendicular to the X-axis direction in the horizontal plane as the Y-axis direction, and the direction perpendicular to the horizontal plane as the Z-axis direction.

[0033] A PLC control panel 5 is installed on the frame 1. The output ends of the PLC control panel 5 are electrically connected to the input ends of the motors or hydraulic cylinder control valves installed on the sprocket-type multi-roller board conveyor 2, the matrix multi-point board lifting assembly 3, the centering assembly 4, the double-sided belt pulley traction assembly 7, and the gear walking assembly 9 respectively.

[0034] The sprocket-type multi-roller board conveyor 2 includes a plurality of rubber rollers 201. The plurality of rubber rollers 201 are arranged in parallel at a certain distance along the material conveying direction. The rubber rollers 201 are rotatably installed in the frame 1. An X-axis sprocket transmission mechanism 202 for ensuring their synchronous rotation is provided at the same end of the plurality of rubber rollers 201.

[0035] The X-axis sprocket transmission mechanism 202 includes a plurality of sprockets. The plurality of sprockets are respectively fixedly connected to their corresponding rubber rollers 201, and a chain is sleeved on the plurality of sprockets.

[0036] A stepping motor 203 is installed on the frame 1. The output end of the stepping motor 203 is in transmission connection with any one of the rubber rollers 201.

[0037] With such a design, after the autoclaved aerated concrete board is centered and positioned, the staff turns on the stepping motor 203 through the PLC control panel 5, uses the stepping motor 203 to drive one of the rubber rollers 201 to rotate, and the rest of the rubber rollers 201 are all driven to rotate synchronously through the X-axis sprocket transmission mechanism 202. The dynamic stability of the board conveying process is improved by the rotation of multiple rollers. Among them, the multi-roller array layout forms a continuous support surface, evenly dispersing the gravity of the board, effectively avoiding the bending deformation caused by suspension during the conveying of long-size boards.

[0038] The matrix multi-point board lifting assembly 3 includes three lifting components arranged in the layer cavity 101. A hollow shaft box 301 is provided at the same end of the three lifting components. The hollow shaft box 301 is fixedly connected to the bottom of the frame 1. A Y-axis sprocket transmission mechanism 303 for driving the three lifting components to act synchronously is provided in the hollow shaft box 301. A reduction motor 305 is fixedly installed on the hollow shaft box 301. The output end of the reduction motor 305 is in transmission connection with the Y-axis sprocket transmission mechanism 303.

[0039] The lifting component includes at least two worm screw jacks 304. The worm screw jacks 304 are fixedly installed on the frame 1. The top of the screw rod of the worm screw jack 304 is fixedly connected to a silica gel disc 306. The worm shafts of the worm screw jacks 304 are in transmission connection through a transmission shaft 302. The transmission shaft 302 is rotatably connected to the frame 1. The transmission shaft 302 is in transmission connection with the Y-axis sprocket transmission mechanism 303.

[0040] In addition to this embodiment, the number of lifting components can also be more than three.

[0041] The lifting components are arranged in parallel between two adjacent rubber rollers 201.

[0042] The structure of the Y-axis sprocket drive mechanism 303 is the same as that of the X-axis sprocket drive mechanism 202, including a plurality of sprockets. The plurality of sprockets are respectively fixedly connected to their corresponding transmission shafts 302, and chains are sleeved on the plurality of sprockets.

[0043] The worm screw lifter 304 is a prior art and can be obtained by purchasing from the market.

[0044] With such a design, after the autoclaved aerated concrete board is sent to the detection station above the matrix multi-point plate lifting assembly 3, the reduction motor 305 and the Y-axis sprocket drive mechanism 303 are used to drive the synchronous rotation of the plurality of transmission shafts 302 arranged in parallel in the X-axis direction, and then drive the worm screw lifter 304 to act. The worm screw lifter 304 drives the silica gel plate 306 to move upward until the silica gel plate 306 contacts the lower surface of the autoclaved aerated concrete board, and the autoclaved aerated concrete board is lifted up. The stress state of the board is reconstructed through distributed support points, and the synchronization of each support point during the lifting process is ensured to avoid the distortion of the board caused by the difference in the local lifting speed.

[0045] The board in the suspended state is separated from the support of the rubber roller 201, creating an unobstructed and complete operation space for subsequent double-sided detection.

[0046] The centering assembly 4 includes two brackets 401 symmetrically arranged at a certain distance. The brackets 401 are fixedly connected above the frame 1 near the feeding end. Two rotating shafts 404 are rotatably connected to each bracket 401 through bearings. A push plate 405 is fixedly connected to the two rotating shafts 404 together. A crank arm 406 is fixedly connected to any one of the rotating shafts 404. A hydraulic cylinder 403 is hinged on the bracket 401. The piston rod of the hydraulic cylinder 403 is hinged to the end of the crank arm 406 away from the rotating shaft 404.

[0047] In addition to this embodiment, the number of the hydraulic cylinders 403 and the crank arms 406 provided on each bracket 401 can also be two. The two crank arms 406 are respectively fixedly connected to their corresponding rotating shafts 404, and the two hydraulic cylinders 403 respectively drive the corresponding crank arms 406 to swing, thereby driving the push plate 405 to swing.

[0048] A longitudinal connecting beam 402 is fixedly connected between the two brackets 401 near the top surface.

[0049] With this design, when the autoclaved aerated concrete slab is placed on the sprocket-type multi-roller plate feeder 2 and is waiting to be transferred, the staff turns on the hydraulic cylinder 403 through the PLC control panel 5, and the piston rod of the hydraulic cylinder 403 pushes the crank arm 406 to swing around the central axis of the rotating shaft 404, and then the crank arm 406 drives the rotating shaft 404 to rotate, and the rotating shaft 404 drives the push plate 405 toward the vertical center reference plane of the sprocket-type multi-roller plate feeder 2, so as to ensure that the center plane of the autoclaved aerated concrete slab coincides with the reference plane of the inspection station, providing ideal initial positioning conditions for subsequent inspection processes.

[0050] The double-sided pulley traction assembly 7 includes two pulley linear modules 701. The two pulley linear modules 701 are fixedly mounted on the top surface of the right-angle sub-frame 6 and are symmetrically arranged at a certain distance. The two pulley linear modules 701 are connected by a connecting shaft 702. A belt drive unit 703 is fixedly mounted on the right-angle sub-frame 6. The belt drive unit 703 is connected to the connecting shaft 702 for driving the connecting shaft 702 to rotate.

[0051] The pulley linear module 701 includes two pulleys, which are rotatably connected to the right-angle sub-frame 6, and a belt is provided between the two pulleys.

[0052] In this design, the crossbeam 8 is slidably connected to the right-angle sub-frame 6 through a guide rail slider, and both ends of the crossbeam 8 are fixedly mounted on the belts of the corresponding pulley linear module 701. The rotation of the connecting shaft 702 drives the belt to rotate, and the belt rotation can drive the crossbeam 8, the gear traveling assembly 9 and the double-sided visual inspection assembly 10 to move back and forth together in the Y-axis direction.

[0053] The belt drive unit 703 consists of a first servo motor, two synchronous pulleys and a belt. The first servo motor is fixedly mounted on the right-angle sub-frame 6. The two synchronous pulleys are respectively fixedly mounted on the output shaft of the first servo motor and the connecting shaft 702. The belt is sleeved between the two synchronous pulleys.

[0054] The gear travel assembly 9 includes an L-shaped slide 901 slidably connected to the beam 8 via a guide rail slider, a bevel rack 902 is fixedly connected to the beam 8, and a gear drive unit 903 is provided on the L-shaped slide 901.

[0055] The gear drive unit 903 includes a second servo motor fixedly mounted on the L-shaped slide 901 . The output end of the second servo motor is drivingly connected to a driving gear disc, which is meshed with the helical rack 902 .

[0056] With such a design, when the gear drive unit 903 is in operation, the gear drive unit 903 can drive the L-shaped carriage 901, the horizontal carriage 1001, and the CCD camera 1002 to move along the X-axis direction, so that the double-sided vision detection assembly 10 moves smoothly and synchronously detects the upper and lower surfaces of the autoclaved aerated concrete board.

[0057] The double-sided vision detection assembly 10 includes two horizontally arranged horizontal carriages 1001 fixedly connected to the L-shaped carriage 901. The two horizontal carriages 1001 are arranged at a certain distance apart. Two CCD cameras 1002 are fixedly installed on each horizontal carriage 1001. The CCD cameras 1002 installed on the upper and lower horizontal carriages 1001 are symmetrically arranged.

[0058] Except for this embodiment, the number of CCD cameras 1002 installed on each horizontal carriage 1001 can also be one.

[0059] With such a design, the belt drive unit 703 drives the coupling shaft 702 to rotate, and then the coupling shaft 702 drives the pulley linear modules 701 at both ends thereof to work. The pulley linear module 701 drives the cross beam 8, the gear walking assembly 9, and the double-sided vision detection assembly 10 to move towards the autoclaved aerated concrete board until the autoclaved aerated concrete board enters between the two horizontal carriages 1001, and the CCD cameras 1002 on the upper and lower horizontal carriages 1001 are used for vision detection, so as to timely detect potential cracks and defects and provide comprehensive data support for the subsequent production process.

[0060] During use, first start the chain-wheel type multi-roller plate feeder 2 through the PLC control panel 5, and gradually send the autoclaved aerated concrete board to be detected to the detection station where the double-sided belt pulley traction assembly 7 and the double-sided vision detection assembly 10 are located. During this process, the centering assembly 4 ensures the precise positioning of the autoclaved aerated concrete board and reduces the detection error caused by position deviation. The operator needs to observe the operating state of the chain-wheel type multi-roller plate feeder 2 to ensure that the board reaches the predetermined position smoothly.

[0061] When the autoclaved aerated concrete board reaches the detection station, the matrix multi-point plate lifting assembly 3 lifts the board upward and suspends it to ensure that the lower surface of the autoclaved aerated concrete board does not contact the roller parts of the chain-wheel type multi-roller plate feeder 2 during the detection process.

[0062] After the board is suspended, start the bilateral belt pulley traction assembly 7 to move the double-sided vision inspection assembly 10 to the position of the autoclaved aerated concrete board. After the double-sided vision inspection assembly 10 reaches the predetermined position, start the gear walking assembly 9 and the double-sided vision inspection assembly 10 to work. The double-sided vision inspection assembly 10 synchronously inspects the possible cracks on the upper and lower surfaces of the autoclaved aerated concrete board. During the inspection process, the double-sided vision inspection assembly 10 captures the images of the upper and lower surfaces of the board in real time, and analyzes whether there are cracks or other defects through image processing algorithms. After the double-sided vision inspection is completed, the double-sided vision inspection assembly 10 feeds back the recognition results to the operator through an external display screen, and the host saves the relevant data for subsequent analysis. The staff records the state of the board and the inspection results.

[0063] After the inspection is completed, the staff activates the reset program of the double-sided vision inspection assembly 10 through the PLC control panel 5, so that the bilateral belt pulley traction assembly 7 and the gear walking assembly 9 drive the double-sided vision inspection assembly 10 back to the initial position. At the same time, the matrix multi-point plate lifting assembly 3 lowers the board, and the sprocket-type multi-roller board feeder 2 starts to send the qualified autoclaved aerated concrete board out of the inspection station and continues to carry out the inspection work of the next process.

[0064] For those of ordinary skill in the art, according to the teachings of the present invention, without departing from the principles and spirit of the present invention, the changes, modifications, substitutions, and variations made to the embodiments still fall within the protection scope of the present invention.

Claims

1. An automatic crack recognition device for autoclaved aerated concrete slabs based on machine vision, comprising a frame (1), characterized in that: Inside the frame (1), a sprocket-type multi-roller plate feeder (2) for transporting autoclaved aerated concrete plates is installed. Below the sprocket-type multi-roller plate feeder (2), a layer cavity (101) is provided. Inside the layer cavity (101), a matrix multi-point plate lifting assembly (3) for lifting the autoclaved aerated concrete plate upward is installed. Above the matrix multi-point plate lifting assembly (3) is the detection station. Near the feeding end above the frame (1), a centering assembly (4) is installed. Right-angle auxiliary frames (6) are fixedly connected to both sides of the frame (1). On both right-angle auxiliary frames (6), a double-sided pulley traction assembly (7) is provided. On the double-sided pulley traction assembly (7), a cross beam (8) is provided. The double-sided pulley traction assembly (7) can drive the cross beam (8) to move in the vertical direction of material transportation. Above the cross beam (8), a gear walking assembly (9) is provided. On the gear walking assembly (9), a double-sided vision inspection assembly (10) for visually inspecting cracks in the lifted autoclaved aerated concrete plate is provided. The gear walking assembly (9) can drive the double-sided vision inspection assembly (10) to move in the material transportation direction; The matrix multi-point plate lifting assembly (3) includes a plurality of lifting components arranged in the layer cavity (101). At the same end of the plurality of lifting components, a hollow axle box (301) is provided. The hollow axle box (301) is fixedly connected to the bottom of the frame (1). Inside the hollow axle box (301), a Y-axis sprocket transmission mechanism (303) for driving the plurality of lifting components to act synchronously is provided. A reduction motor (305) is fixedly installed on the hollow axle box (301). The output end of the reduction motor (305) is in transmission connection with the Y-axis sprocket transmission mechanism (303).

2. The automatic crack recognition device for autoclaved aerated concrete slabs based on machine vision according to claim 1, characterized in that: The sprocket-type multi-roller plate feeder (2) includes a plurality of rubber rollers (201). The plurality of rubber rollers (201) are arranged in parallel at a certain distance interval along the material transportation direction. The rubber rollers (201) are rotatably installed inside the frame (1). At the same end of the plurality of rubber rollers (201), an X-axis sprocket transmission mechanism (202) for ensuring their synchronous rotation is provided. A stepping motor (203) is installed on the frame (1). The output end of the stepping motor (203) is in transmission connection with any one of the rubber rollers (201).

3. The automatic crack recognition device for autoclaved aerated concrete slabs based on machine vision according to claim 2, characterized in that: The lifting component includes at least two worm gear screw jacks (304). The worm gear screw jacks (304) are fixedly installed on the frame (1). The top of the screw rod of the worm gear screw jack (304) is fixedly connected to a silica gel disc (306). The worm shaft of the worm gear screw jack (304) is in transmission connection through a transmission shaft (302). The transmission shaft (302) is rotatably connected to the frame (1). The transmission shaft (302) is in transmission connection with the Y-axis sprocket transmission mechanism (303). The lifting components are arranged in parallel between two adjacent rubber rollers (201).

4. The automatic crack recognition device for autoclaved aerated concrete slabs based on machine vision according to claim 1, characterized in that: The double-sided pulley traction assembly (7) comprises two pulley linear modules (701), both of which are fixedly mounted on the top surface of the right-angled sub-frame (6) and symmetrically arranged at a certain distance. The two pulley linear modules (701) are connected by a connecting shaft (702). A belt drive unit (703) is fixedly mounted on the right-angled sub-frame (6), and the belt drive unit (703) is connected by a connecting shaft (702) for driving the connecting shaft (702) to rotate.

5. The automatic crack recognition device for autoclaved aerated concrete slabs based on machine vision according to claim 1, characterized in that: The gear travel assembly (9) comprises an L-shaped carriage (901) slidably connected to the crossbeam (8), a bevel rack (902) is fixedly connected to the crossbeam (8), and a gear drive unit (903) is provided on the L-shaped carriage (901).

6. The automatic crack recognition device for autoclaved aerated concrete slabs based on machine vision according to claim 5, characterized in that: The gear drive unit (903) comprises a second servo motor fixedly mounted on the L-shaped slide (901), wherein the output end of the second servo motor is transmission-connected to a driving gear disc, and the driving gear disc is meshingly connected to the helical rack (902).

7. The automatic crack recognition device for autoclaved aerated concrete slabs based on machine vision according to claim 6, characterized in that: The double-sided visual inspection assembly (10) comprises two horizontally arranged frames (1001) fixedly connected to an L-shaped slide (901), the two frames (1001) being arranged at a certain distance from each other, a CCD camera (1002) being fixedly mounted on each frame (1001), and the CCD cameras (1002) mounted on the upper and lower frames (1001) being symmetrically arranged.

8. The automatic crack recognition device for autoclaved aerated concrete slabs based on machine vision according to claim 1, characterized in that: The centering assembly (4) comprises two brackets (401) symmetrically arranged at a certain distance from each other. The brackets (401) are fixedly connected to the upper part of the frame (1) near the feed end. Two rotating shafts (404) are rotatably connected to each bracket (401). A push plate (405) is fixedly connected to both rotating shafts (404). A crank arm (406) is fixedly connected to any one of the rotating shafts (404). A hydraulic cylinder (403) is hingedly connected to the bracket (401). The piston rod of the hydraulic cylinder (403) is hingedly connected to an end of the crank arm (406) away from the rotating shaft (404).

9. The automatic crack recognition device for autoclaved aerated concrete slabs based on machine vision according to claim 1, characterized in that: A PLC control panel (5) is installed on the frame (1).

Images