A steel sheet surface defect detection apparatus

Abstract

The application discloses a kind of steel plate surface defect detection equipment, belong to steel plate detection technical field, including for guiding steel plate main mechanism, main mechanism is provided with for conveying steel plate conveying mechanism and for the surface defect detection of steel plate detection mechanism;The linkage structure of the lifting walking frame driven by the bottom electric cylinder and the detection mechanism in the application, when steel plate is in position, bottom electric cylinder shrinks and makes lifting walking frame descend, and the connecting rod mechanism of upper rotating wheel, short transmission frame and long rotating frame is formed by descending action, is converted into the upward thrust of lower rotating wheel to lifting cross bar, and then drives the whole detection pressure module to rise, this process will be the coupling of the descending action of steel plate and the ascending action of bottom rotary probe accurately, so that steel plate is clamped between top eddy current detector and bottom rotary probe, and flexible, constant force compression on the upper and lower surfaces of steel plate is realized by compression support and compression spring, to ensure that steel plate and detection probe are closely attached.

Description

Technical Field

[0001] This invention relates to the field of steel plate inspection technology, and in particular to a steel plate surface defect detection device. Background Technology

[0002] Steel plates, as a fundamental raw material in modern industry, are widely used in critical fields such as automobile manufacturing, shipbuilding, bridge engineering, pressure vessels, and aerospace. Their surface quality directly determines the performance, lifespan, and reliability of the final product. During the steel plate production process, due to the influence of rolling technology, equipment conditions, and environmental factors, various types of defects such as cracks, scratches, holes, rust, indented oxide scale, and roll marks can easily appear on the surface. These defects not only affect the appearance of the product but can also become stress concentration sources, leading to material fracture during subsequent processing or service, causing serious safety hazards and economic losses.

[0003] Therefore, rigorous and efficient surface defect inspection before steel plates leave the factory is an indispensable part of the quality control process. Traditional inspection methods mainly rely on manual visual observation, which has many drawbacks: First, the inspection speed is slow and cannot be matched with modern high-speed rolling production lines, becoming a bottleneck for capacity improvement; second, the inspection standards are highly subjective and easily affected by factors such as the experience and visual fatigue of the inspectors, resulting in a high rate of missed and false detections, making it difficult to guarantee the consistency and accuracy of the inspection results; third, some subtle or hidden early defects are difficult for the human eye to identify, posing potential risks to product quality.

[0004] To overcome the limitations of manual inspection, the industry has gradually developed automated inspection equipment based on machine vision or physical detection. However, some existing automated inspection solutions still have the following shortcomings: low positioning and conveying accuracy; steel plates are prone to deviation or vibration during conveying at the inspection station, leading to instability in the inspection area and affecting the reliability of the inspection results; many devices have complex guiding and clamping mechanisms with poor adaptability, making it impossible to effectively and stably center and position steel plates of different widths; poor adaptability of the inspection mechanism; traditional inspection probes or sensors are mostly fixed installations, making it difficult to adapt to the slight warping or thickness fluctuations that may exist in the steel plate; during the inspection process, the probe and the surface of the steel plate cannot maintain a constant and uniform contact pressure, resulting in unstable inspection signals. Especially for technologies that require contact inspection, poor contact can directly cause signal distortion or missed detections; complex transmission structure; lifting affects power transmission; when lifting and conveying mechanisms are required to adapt to different inspection stations or avoid obstacles, traditional power transmission methods often cannot guarantee the continuity and reliability of power during the lifting process, easily leading to slippage, jamming, or changes in the transmission ratio. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention discloses a steel plate surface defect detection device with high-precision automatic centering and conveying function, stable and reliable detection contact mechanism, power transmission structure adaptable to lifting and lowering motion, and real-time monitoring of the detection process. The technical solution adopted by this invention is as follows: a steel plate surface defect detection device, including a main body mechanism for guiding the steel plate, the main body mechanism including an outer housing, and a conveying mechanism for conveying the steel plate and a detection mechanism for detecting surface defects in the steel plate are provided on the main body mechanism;

[0006] The main structure includes an inner support plate fixedly installed inside the outer box, and multiple side columns are fixedly installed at both ends of the inner support plate.

[0007] The conveying mechanism includes two lifting frames that are slidably mounted on the inner support plate. Multiple drive rollers are rotatably mounted inside the lifting frames. The uppermost end of the drive rollers extends beyond the upper surface of the lifting frames. In the initial state, the uppermost end of the drive rollers extends beyond the upper surface of the inner support plate.

[0008] Furthermore, the main body mechanism also includes side clamping frames that are slidably installed on both sides of the inner support plate. Multiple clamping springs are provided between the side clamping frames and the inner support plate. Two slopes are provided at both ends of the side clamping frames, and two centering slopes are provided at both ends of the side clamping frames.

[0009] Furthermore, the main body mechanism also includes multiple infeed rollers rotatably mounted on the side clamping frame, and multiple horizontal rollers and multiple vertical rollers rotatably mounted on the inner side of the side clamping frame, with the vertical rollers located above the horizontal rollers.

[0010] Furthermore, the main structure also includes an upper sealing plate and a lower sealing plate fixedly installed at both ends of the outer casing, with the upper end of the lower sealing plate fixedly installed with the inner support plate.

[0011] In use, the steel plate is placed along the slope of the side clamping frame, and the infeed rollers assist in placing the steel plate. Then the steel plate contacts the horizontal roller on the centering slope, and the steel plate pushes the centering slope and the horizontal roller outward, compressing the clamping spring. Then the steel plate reaches between the horizontal rollers on the straight section of the two side clamping frames. At this time, the clamping spring is in a compressed state to limit the left and right position of the steel plate, so that the steel plate is centered.

[0012] Furthermore, the conveying mechanism also includes a lower drive shaft rotatably mounted below the lifting frame, an inner drive wheel fixedly mounted on the lower drive shaft, and the inner drive wheel drives the drive roller located above the inner drive wheel to rotate via a vertical drive belt. The drive roller located above the inner drive wheel drives all the drive rollers located in the same lifting frame to rotate via a linkage belt.

[0013] Furthermore, the conveying mechanism also includes a drive motor fixedly mounted on the outer housing. A drive pulley is fixedly mounted on the motor shaft of the drive motor. An outer rotating plate is rotatably mounted on the drive pulley. The outer rotating plate is rotatably mounted on the motor shaft of the drive motor. An intermediate pulley is rotatably mounted on the outer rotating plate. An outer transmission belt is wound around the intermediate pulley and the drive pulley. An inner rotating plate is rotatably mounted on the outer rotating plate. The intermediate pulley is rotatably mounted on the inner rotating plate. An inner pulley is rotatably mounted on the inner rotating plate. An inner transmission belt is wound around the inner pulley and the intermediate pulley. The inner pulley is fixedly mounted on the lower transmission shaft.

[0014] Initially, the top of the drive roller is flush with the top of the inlet and outlet rollers. When the steel plate reaches between the horizontal rollers on the straight section of the two side clamping frames, the drive motor drives the drive pulley to rotate. The drive pulley drives the middle pulley to rotate via the outer transmission belt. The middle pulley drives the inner pulley, lower transmission shaft, and inner transmission wheel to rotate via the inner transmission belt. The inner transmission wheel drives the drive roller above the inner transmission wheel to rotate via the vertical transmission belt. The drive roller above the inner transmission wheel drives all the drive rollers to rotate via the linkage belt. The drive rollers transport the steel plate, causing it to move below the upper detection plate.

[0015] When the lifting frame moves up and down relative to the inner support plate, the lifting frame causes the upper part of the inner rotating plate to descend, and the inner rotating plate causes the outer rotating plate to rotate relative to the motor shaft of the drive motor. This ensures the reliability of the drive motor driving the drive rollers.

[0016] Furthermore, the testing mechanism includes an upper testing plate fixedly installed on the side column, and multiple eddy current detectors are installed on the upper testing plate.

[0017] Furthermore, the detection mechanism also includes multiple long rotating frames rotatably mounted on the outer housing. Lower rotating wheels are rotatably mounted at the ends of the long rotating frames. Short transmission frames are fixedly mounted on the long rotating frames. Upper rotating wheels are rotatably mounted at the ends of the short transmission frames. In the initial state, the upper rotating wheels are in contact with the lower end of the lifting and traveling frame, and the short transmission frames form an 80° angle with the horizontal plane. A bottom electric cylinder is fixedly mounted on the outer housing, and the output end of the bottom electric cylinder is fixedly mounted to the bottom of the lifting and traveling frame.

[0018] Furthermore, the detection mechanism also includes two lifting crossbars slidably mounted on the outer housing. Multiple pressure detection modules are provided on the lifting crossbars. Each pressure detection module includes a sliding lifting frame fixedly mounted on the lifting crossbar. A clamping bracket is slidably mounted on the sliding lifting frame. A clamping spring is provided between the clamping bracket and the sliding lifting frame. An intelligent sensor is fixedly mounted on the sliding lifting frame. A rotating probe is provided on the top of the intelligent sensor.

[0019] Once the steel plate reaches below the upper detection plate, the bottom electric cylinder retracts, causing the lifting frame to descend. This descent of the lifting frame drives the short transmission frame and long rotating frame to rotate via the upper rotating wheel, bringing the lower rotating wheel into contact with the lifting crossbar. The lifting crossbar then rises, causing the sliding lifting frame, clamping bracket, and rotating probe to rise. When the rotating probe contacts the bottom of the steel plate, it lifts the steel plate along with it, pressing the rotating probe down. Finally, the clamping bracket continues to lift the steel plate, bringing its upper surface into contact with the bottom of the eddy current detector. The rotating probe then continues to rise, and the clamping bracket slides relative to the sliding lifting frame, compressing the clamping spring and causing the rotating probe to... The head, steel plate, and eddy current detector are tightly fitted together. The eddy current detector generates a high-frequency alternating current, inducing eddy currents inside the steel plate. When the eddy currents flow within the steel plate, if they encounter defects such as cracks or corrosion, the path and intensity of the eddy currents will change. Correspondingly, the intensity and distribution of the secondary magnetic field they generate will also change. The changes in eddy currents are detected by a rotating probe. An intelligent sensor is closely attached to the rotating probe and can monitor the contact pressure between the rotating probe and the lower surface of the steel plate at an extremely high frequency. When a sudden decrease in pressure is detected, it means that the rotating probe has moved away from the bottom of the steel plate. At this point, rejection or compensation is performed to improve accuracy.

[0020] After the inspection is completed, the bottom electric cylinder extends, driving the lifting walking frame to rise. At this time, under the action of gravity, the lifting crossbar and the sliding lifting frame descend. Simultaneously, the long rotating frame resets under the action of gravity and the descending force of the lifting crossbar. Then the steel plate descends. When the drive roller contacts the steel plate, the steel plate is sent out through the drive roller, completing the inspection.

[0021] The beneficial effects of this invention compared with the prior art are: (1) This invention achieves flexible guidance and high-precision automatic centering of the steel plate by setting a side clamping frame, clamping spring and various roller combinations in the main body mechanism. When the steel plate enters, it overcomes the elastic force of the clamping spring by contacting the slope on the side clamping frame and the horizontal roller on the centering slope, and automatically pushes the side clamping frame to unfold outward. After the steel plate has completely entered the straight section, the reaction force of the clamping spring can adaptively clamp the steel plate in the center position. Avoid rigid damage and be compatible with steel plates of different widths. Eliminate deviation and shaking during the conveying process, and lay a stable positional foundation for subsequent high-precision detection; (2) The present invention uses a linkage structure between the lifting walking frame driven by the bottom electric cylinder and the detection mechanism. When the steel plate is in place, the bottom electric cylinder retracts to lower the lifting walking frame. The lowering action is converted into an upward thrust of the lower rotating wheel on the lifting crossbar through the linkage mechanism composed of the upper rotating wheel, the short transmission frame and the long rotating frame, thereby driving the entire pressure detection module to rise. This process precisely couples the lowering action of the steel plate with the rising action of the bottom rotating probe, so that the steel plate is clamped between the top eddy current detector and the bottom rotating probe. Then, by pressing The cooperation between the bracket and the compression spring realizes flexible and constant force compression of the upper and lower surfaces of the steel plate, ensuring the tight fit between the steel plate and the detection probe; (3) Based on the compression spring ensuring the fit force, the intelligent sensor is close to the rotating probe to monitor the real-time fit pressure between the probe and the lower surface of the steel plate. Once the pressure value is detected to be abnormally small, the system can determine that the rotating probe has detached from the surface of the steel plate, which may be due to severe warping of the plate or other reasons. At this time, the control system can immediately issue an instruction to mark the detection data or trigger the supplementary inspection process, effectively avoiding missed detection and misjudgment caused by poor contact, improving the reliability of the detection data and the quality assurance level of the final product. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the overall structure of the present invention (internal).

[0024] Figure 3 This is a schematic diagram of the main structure of the present invention. Figure 1 .

[0025] Figure 4 This is a schematic diagram of the main structure of the present invention. Figure 2 .

[0026] Figure 5 This is a schematic diagram of the conveying mechanism structure of the present invention. Figure 1 .

[0027] Figure 6 This is a schematic diagram of the conveying mechanism structure of the present invention. Figure 2 .

[0028] Figure 7 This is a schematic diagram of the conveying mechanism structure of the present invention. Figure 3 .

[0029] Figure 8 This is a schematic diagram of the detection mechanism of the present invention. Figure 1 .

[0030] Figure 9 This is a schematic diagram of the detection mechanism of the present invention. Figure 2 .

[0031] Figure 10 This is a schematic diagram of the detection mechanism of the present invention. Figure 3 .

[0032] Figure 11 This is a schematic diagram of the pressure detection module structure of the present invention.

[0033] Reference numerals: 101-External housing; 102-Upper closing plate; 103-Lower closing plate; 104-Inner support plate; 105-Side clamping frame; 106-Clamping spring; 107-Infeed / outfeed rollers; 108-Centering slope; 109-Horizontal roller; 110-Vertical roller; 111-Side column; 201-Drive motor; 202-Drive pulley; 203-Outer rotating plate; 204-Intermediate pulley; 205-Outer transmission belt; 206-Inner rotating plate; 207-Inner pulley; 208-Inner transmission belt; 20 9-Lower drive shaft; 210-Lifting walking frame; 211-Vertical drive belt; 212-Drive roller; 213-Linkage belt; 214-Inner drive wheel; 301-Upper detection plate; 302-Eddy current detector; 303-Long rotating frame; 304-Lower rotating wheel; 305-Short drive frame; 306-Upper rotating wheel; 307-Bottom electric cylinder; 308-Sliding lifting frame; 309-Intelligent sensor; 310-Rotating probe; 311-Pressure bracket; 312-Pressure spring; 313-Lifting crossbar; 4-Steel plate. Detailed Implementation

[0034] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0035] Example: Reference Figures 1-11 A steel plate surface defect detection device includes a main body mechanism for guiding a steel plate 4. The main body mechanism includes an outer housing 101. The main body mechanism is provided with a conveying mechanism for conveying the steel plate 4 and a detection mechanism for detecting surface defects in the steel plate 4.

[0036] The main structure includes an inner support plate 104 fixedly installed inside the outer box 101, and multiple side columns 111 are fixedly installed at both ends of the inner support plate 104.

[0037] The conveying mechanism includes two lifting frames 210 that are slidably mounted on the inner support plate 104. Multiple drive rollers 212 are rotatably mounted inside the lifting frames 210. The uppermost end of the drive rollers 212 extends beyond the upper surface of the lifting frames 210. In the initial state, the uppermost end of the drive rollers 212 extends beyond the upper surface of the inner support plate 104.

[0038] like Figure 3 , Figure 4 As shown, the main structure also includes side clamping frames 105 that are slidably installed on both sides of the inner support plate 104. Multiple clamping springs 106 are provided between the side clamping frames 105 and the inner support plate 104. Two slopes are provided at both ends of the side clamping frames 105, and two centering inclined surfaces 108 are provided at both ends of the side clamping frames 105.

[0039] like Figure 3 , Figure 4 As shown, the main mechanism also includes multiple infeed rollers 107 rotatably mounted on the side clamping frame 105. Multiple horizontal rollers 109 and multiple vertical rollers 110 are rotatably mounted on the inner side of the side clamping frame 105, with the vertical rollers 110 located above the horizontal rollers 109.

[0040] like Figure 3 , Figure 4 As shown, the main structure also includes an upper sealing plate 102 and a lower sealing plate 103 fixedly installed at both ends of the outer box 101, with the upper end of the lower sealing plate 103 fixedly installed with the inner support plate 104.

[0041] In use, the steel plate 4 is placed along the slope of the side clamping frame 105. The insertion of the steel plate 4 is assisted by the infeed roller 107. Then the steel plate 4 contacts the horizontal roller 109 on the centering slope 108. The steel plate 4 pushes the centering slope 108 and the horizontal roller 109 outward, and the clamping spring 106 is compressed. Then the steel plate 4 reaches between the horizontal roller 109 on the straight section of the two side clamping frames 105. At this time, the clamping spring 106 is in a compressed state to limit the left and right position of the steel plate 4, so that the steel plate 4 is centered.

[0042] like Figures 5-7 As shown, the conveying mechanism also includes a lower drive shaft 209 rotatably mounted below the lifting frame 210. An inner drive wheel 214 is fixedly mounted on the lower drive shaft 209. The inner drive wheel 214 drives the drive roller 212 located above the inner drive wheel 214 to rotate via the vertical drive belt 211. The drive roller 212 located above the inner drive wheel 214 drives all the drive rollers 212 located in the same lifting frame 210 to rotate via the linkage belt 213.

[0043] like Figures 5-7As shown, the conveying mechanism also includes a drive motor 201 fixedly mounted on the outer housing 101. A drive pulley 202 is fixedly mounted on the motor shaft of the drive motor 201. An outer rotating plate 203 is rotatably mounted on the drive pulley 202. The outer rotating plate 203 is rotatably mounted on the motor shaft of the drive motor 201. An intermediate pulley 204 is rotatably mounted on the outer rotating plate 203. An outer transmission belt 205 is wound around the intermediate pulley 204 and the drive pulley 202. An inner rotating plate 206 is rotatably mounted on the outer rotating plate 203. The intermediate pulley 204 is rotatably mounted on the inner rotating plate 206. An inner pulley 207 is rotatably mounted on the inner rotating plate 206. An inner transmission belt 208 is wound around the inner pulley 207 and the intermediate pulley 204. The inner pulley 207 is fixedly mounted on the lower transmission shaft 209.

[0044] In the initial state, the uppermost end of the drive roller 212 is flush with the uppermost end of the inlet and outlet roller 107. When the steel plate 4 reaches between the horizontal rollers 109 of the straight section of the two side clamping frames 105, the drive motor 201 drives the drive pulley 202 to rotate. The drive pulley 202 drives the intermediate pulley 204 to rotate through the outer transmission belt 205. The intermediate pulley 204 drives the inner pulley 207, the lower transmission shaft 209 and the inner transmission wheel 214 to rotate through the inner transmission belt 208. The inner transmission wheel 214 drives the drive roller 212 above the inner transmission wheel 214 to rotate through the vertical transmission belt 211. The drive roller 212 above the inner transmission wheel 214 drives all the drive rollers 212 to rotate through the linkage belt 213. The steel plate 4 is conveyed through the drive roller 212, so that the steel plate 4 moves to below the upper detection plate 301.

[0045] When the lifting frame 210 moves up and down relative to the inner support plate 104, the lifting frame 210 drives the upper end of the inner rotating plate 206 to descend. The inner rotating plate 206 drives the outer rotating plate 203 to rotate relative to the motor shaft of the drive motor 201. This ensures the reliability of the drive motor 201 driving the drive roller 212 when the lifting frame 210 is at different heights.

[0046] like Figures 8-11 As shown, the testing mechanism includes an upper testing plate 301 fixedly installed on the side column 111, and multiple eddy current detectors 302 are installed on the upper testing plate 301.

[0047] like Figures 8-11As shown, the testing mechanism also includes multiple long rotating frames 303 rotatably mounted on the outer housing 101. Lower rotating wheels 304 are rotatably mounted at the ends of the long rotating frames 303. Short transmission frames 305 are fixedly mounted on the long rotating frames 303. Upper rotating wheels 306 are rotatably mounted at the ends of the short transmission frames 305. In the initial state, the upper rotating wheels 306 are in contact with the lower end of the lifting and traveling frame 210, and the short transmission frames 305 form an 80° angle with the horizontal plane. A bottom electric cylinder 307 is fixedly mounted on the outer housing 101, and the output end of the bottom electric cylinder 307 is fixedly mounted to the bottom of the lifting and traveling frame 210.

[0048] like Figures 8-11 As shown, the detection mechanism also includes two lifting crossbars 313 that are slidably mounted on the outer housing 101. Multiple pressure detection modules are provided on the lifting crossbars 313. Each pressure detection module includes a sliding lifting frame 308 that is fixedly mounted on the lifting crossbars 313. A clamping bracket 311 is slidably mounted on the sliding lifting frame 308. A clamping spring 312 is provided between the clamping bracket 311 and the sliding lifting frame 308. An intelligent sensor 309 is fixedly mounted on the sliding lifting frame 308. A rotating probe 310 is provided on the top of the intelligent sensor 309.

[0049] When the steel plate 4 reaches below the upper detection plate 301, the bottom electric cylinder 307 retracts, causing the lifting travel frame 210 to descend. The descent of the lifting travel frame 210 drives the short transmission frame 305 and the long rotating frame 303 to rotate via the upper rotating wheel 306, causing the lower rotating wheel 304 to contact the lifting crossbar 313. Subsequently, the lifting crossbar 313 rises, causing the sliding lifting frame 308, the clamping bracket 311, and the rotating probe 310 to rise. When the rotating probe 310 contacts the bottom of the steel plate 4, it causes the steel plate 4 to rise together, so that the upper surface of the steel plate 4 contacts the bottom of the eddy current detector 302. Then, the rotating probe 310 continues to rise. The rotating probe 310 is then pressed down, and finally, the clamping bracket 311 continues to lift the steel plate 4. The clamping bracket 311, relative to the sliding... The sliding lifting frame 308 compresses the clamping spring 312, causing the rotating probe 310, steel plate 4, and eddy current detector 302 to fit tightly together. The eddy current detector 302 generates a high-frequency alternating current, inducing eddy currents inside the steel plate 4. When the eddy currents flow inside the steel plate 4, if they encounter defects such as cracks or corrosion, the path and intensity of the eddy currents will change. Correspondingly, the intensity and distribution of the secondary magnetic field they generate will also change. The rotating probe 310 detects the changes in eddy currents. The intelligent sensor 309 is in close contact with the rotating probe 310 and can monitor the contact pressure between the rotating probe 310 and the lower surface of the steel plate 4. When the pressure value suddenly decreases, it means that the rotating probe 310 has moved away from the bottom of the steel plate 4. At this time, compensation is performed to improve the accuracy.

[0050] Rejection refers to marking the detection data corresponding to the period of abnormal pressure as invalid, or separating the corresponding steel plate segment as a suspected defective product in subsequent processes. Compensation refers to supplementing the detection during the period of abnormal pressure to avoid misjudging it as a qualified product. It is achieved by recording the correspondence between the abnormal time and the position of the steel plate through the control system and combining it with the subsequent sorting device.

[0051] After the test is completed, the bottom electric cylinder 307 extends, driving the lifting walking frame 210 to rise. At this time, under the action of gravity, the lifting crossbar 313 and the sliding lifting frame 308 descend. At the same time, the long rotating frame 303 resets under the action of gravity and the descending force of the lifting crossbar 313. Then the steel plate 4 descends. When the drive roller 212 contacts the steel plate 4, the drive roller 212 sends the steel plate 4 out, completing the test.

[0052] Working principle: When in use, the steel plate 4 is placed along the slope of the side clamping frame 105. The insertion of the steel plate 4 is assisted by the infeed roller 107. Then the steel plate 4 contacts the horizontal roller 109 on the centering slope 108. The steel plate 4 pushes the centering slope 108 and the horizontal roller 109 outward, and the clamping spring 106 is compressed. Then the steel plate 4 reaches between the horizontal roller 109 on the straight section of the two side clamping frames 105. At this time, the clamping spring 106 is in a compressed state to limit the left and right position of the steel plate 4, so that the steel plate 4 is centered.

[0053] In the initial state, the uppermost end of the drive roller 212 is flush with the uppermost end of the inlet and outlet roller 107. When the steel plate 4 reaches between the horizontal rollers 109 of the straight section of the two side clamping frames 105, the drive motor 201 drives the drive pulley 202 to rotate. The drive pulley 202 drives the intermediate pulley 204 to rotate through the outer transmission belt 205. The intermediate pulley 204 drives the inner pulley 207, the lower transmission shaft 209 and the inner transmission wheel 214 to rotate through the inner transmission belt 208. The inner transmission wheel 214 drives the drive roller 212 above the inner transmission wheel 214 to rotate through the vertical transmission belt 211. The drive roller 212 above the inner transmission wheel 214 drives all the drive rollers 212 to rotate through the linkage belt 213. The steel plate 4 is conveyed through the drive roller 212, so that the steel plate 4 moves to below the upper detection plate 301. When the lifting frame 210 moves up and down relative to the inner support plate 104, the lifting frame 210 drives the upper end of the inner rotating plate 206 to descend, and the inner rotating plate 206 drives the outer rotating plate 203 to rotate relative to the motor shaft of the drive motor 201. At this time, the reliability of the drive motor 201 driving the drive roller 212 can be guaranteed.

[0054] When the steel plate 4 reaches below the upper detection plate 301, the bottom electric cylinder 307 retracts, causing the lifting travel frame 210 to descend. The descent of the lifting travel frame 210 drives the short transmission frame 305 and the long rotating frame 303 to rotate via the upper rotating wheel 306, causing the lower rotating wheel 304 to contact the lifting crossbar 313. Subsequently, the lifting crossbar 313 rises, causing the sliding lifting frame 308, the clamping bracket 311, and the rotating probe 310 to rise. When the rotating probe 310 contacts the bottom of the steel plate 4, it causes the steel plate 4 to rise together, so that the upper surface of the steel plate 4 contacts the bottom of the eddy current detector 302. Then, the rotating probe 310 continues to rise, the clamping bracket 311 slides relative to the sliding lifting frame 308, and the clamping spring 312 is compressed. The compression ensures that the rotating probe 310, steel plate 4, and eddy current detector 302 are in close contact. The eddy current detector 302 generates a high-frequency alternating current, inducing eddy currents inside the steel plate 4. When the eddy currents flow inside the steel plate 4, if they encounter defects such as cracks or corrosion, the path and intensity of the eddy currents will change. Correspondingly, the intensity and distribution of the secondary magnetic field they generate will also change. The rotating probe 310 detects the changes in eddy currents. The intelligent sensor 309 is in close contact with the rotating probe 310 and can monitor the contact pressure between the rotating probe 310 and the lower surface of the steel plate 4 at an extremely high frequency. When the pressure value suddenly decreases, it means that the rotating probe 310 has moved away from the bottom of the steel plate 4. At this time, rejection or compensation is performed to improve accuracy.

[0055] After the test is completed, the bottom electric cylinder 307 extends, driving the lifting walking frame 210 to rise. At this time, under the action of gravity, the lifting crossbar 313 and the sliding lifting frame 308 descend. At the same time, the long rotating frame 303 resets under the action of gravity and the descending force of the lifting crossbar 313. Then the steel plate 4 descends. When the drive roller 212 contacts the steel plate 4, the drive roller 212 sends the steel plate 4 out, completing the test.

[0056] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the present invention based on the technical solution and inventive concept of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A steel plate surface defect detection device, comprising a main body mechanism for guiding the steel plate (4), characterized in that: The main body includes an outer box (101), and the main body is provided with a conveying mechanism for conveying the steel plate (4) and a detection mechanism for detecting surface defects of the steel plate (4); The main structure includes an inner support plate (104) that is fixedly installed inside the outer casing (101). The conveying mechanism includes two lifting frames (210) that are slidably mounted on the inner support plate (104), and multiple drive rollers (212) are rotatably mounted inside the lifting frames (210). Multiple side columns (111) are fixedly installed at both ends of the inner support plate (104). The detection mechanism includes an upper detection plate (301) fixedly installed on the side columns (111). Multiple eddy current detectors (302) are provided on the upper detection plate (301). The detection mechanism also includes multiple long rotating frames (303) rotatably mounted on the outer housing (101). The ends of the long rotating frames (303) are rotatably mounted with lower rotating wheels (304). Short transmission frames (305) are fixedly mounted on the long rotating frames (303). The ends of the short transmission frames (305) are rotatably mounted with upper rotating wheels (306). In the initial state, one end of the short transmission frame (305) is in contact with the lower end of the lifting walking frame (210). The outer housing (101) is fixedly mounted with a bottom electric cylinder (307). The output end of the bottom electric cylinder (307) is fixedly mounted with the bottom of the lifting walking frame (210). The detection mechanism also includes two lifting crossbars (313) slidably mounted on the outer housing (101). Multiple pressure detection modules are provided on the lifting crossbars (313). Each pressure detection module includes a sliding lifting frame (308) fixedly mounted on the lifting crossbars (313). A clamping bracket (311) is slidably mounted on the sliding lifting frame (308). A clamping spring (312) is provided between the clamping bracket (311) and the sliding lifting frame (308). A smart sensor (309) is fixedly mounted on the sliding lifting frame (308). A rotating probe (310) is provided on the top of the smart sensor (309). The main structure also includes side clamping frames (105) that are slidably installed on both sides of the inner support plate (104). A plurality of clamping springs (106) are provided between the side clamping frames (105) and the inner support plate (104). At least one centering inclined surface (108) is provided on the side clamping frames (105). The main structure also includes a plurality of inlet and outlet rollers (107) rotatably mounted on the side clamping frame (105), and a plurality of horizontal rollers (109) and a plurality of vertical rollers (110) are rotatably mounted on the inner side of the side clamping frame (105).

2. The steel plate surface defect detection equipment according to claim 1, characterized in that: The main structure also includes an upper sealing plate (102) and a lower sealing plate (103) fixedly installed at both ends of the outer box (101), with the upper end of the lower sealing plate (103) fixedly installed with the inner support plate (104).

3. The steel plate surface defect detection equipment according to claim 1, characterized in that: The conveying mechanism also includes a lower drive shaft (209) rotatably mounted below the lifting frame (210). An inner drive wheel (214) is fixedly mounted on the lower drive shaft (209). The inner drive wheel (214) drives the drive roller (212) located above the inner drive wheel (214) to rotate via a vertical drive belt (211). The drive roller (212) located above the inner drive wheel (214) drives all the drive rollers (212) located in the same lifting frame (210) to rotate via a linkage belt (213).

4. The steel plate surface defect detection equipment according to claim 3, characterized in that: The conveying mechanism also includes a drive motor (201) fixedly mounted on the outer housing (101). A drive pulley (202) is fixedly mounted on the motor shaft of the drive motor (201). An outer rotating plate (203) is rotatably mounted on the motor shaft of the drive motor (201). The outer rotating plate (203) is rotatably mounted on the motor shaft of the drive motor (201). An intermediate pulley (204) is rotatably mounted on the outer rotating plate (203). An outer transmission belt (205) is wound around the intermediate pulley (204) and the drive pulley (202). The intermediate pulley (204) is rotatably mounted on the inner rotating plate (206). An inner pulley (207) is rotatably mounted on the inner rotating plate (206). An inner transmission belt (208) is wound around the inner pulley (207) and the intermediate pulley (204). The inner pulley (207) is fixedly mounted on the lower transmission shaft (209).

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