A cold-rolled sheet surface defect detection apparatus

Abstract

The present application relates to the technical field of cold-rolled sheet surface defect detection, in particular to a cold-rolled sheet surface defect detection device, which comprises a conveying unit, a cleaning unit and a detection unit. Through the cooperation of the control part, the upper detection part, the linkage part, the support part and the rectangular linkage plate, the upper cleaning part is ensured to be in close contact with the upper surface of the cold-rolled sheet. The deformed support part supports the cold-rolled sheet on the lower detection part, so that the cold-rolled sheet is always in a horizontal state. When the left end of the cold-rolled sheet is not supported by the middle conveying roller during the right movement, the cold-rolled sheet will not bend between the lower detection part and the upper detection part due to the lack of support. The upper and lower surfaces of the cold-rolled sheet are cleaned by the lower and upper cleaning parts, so that the impurities and oil stains on the surface of the cold-rolled sheet do not affect the detection results. According to the need, the cleaning roller can be quickly limited and replaced through the threaded insertion column, so as to ensure the cleaning effect of the cleaning roller on the cold-rolled sheet and the accuracy of the detection results.

Description

Technical Field

[0001] This invention relates to the field of surface defect detection technology for cold-rolled steel sheets, specifically to a surface defect detection device for cold-rolled steel sheets. Background Technology

[0002] Cold-rolled steel sheet is a product made by rolling hot-rolled coils at room temperature and below the recrystallization temperature. It has the characteristics of high stamping performance, non-aging, and low yield point. Therefore, cold-rolled steel sheet has a wide range of applications, mainly in the automotive, printed steel drum, and construction industries. It is also the best material for producing organic coated steel sheets. In order to ensure product quality, improve production efficiency, and ensure safe production, it is necessary to perform defect detection on the surface of the produced cold-rolled steel sheet.

[0003] Traditional surface defect detection of cold-rolled steel sheets typically involves mounting image sensors on the top and bottom sides of the sheet for direct inspection, using conventional conveyor rollers for transport. However, cold-rolled steel sheets are often produced using lubricating oil or coolant, leaving residual oil and impurities on the surface. These oil and impurities can mask actual surface defects. During inspection, mechanical contact or friction can generate metal debris on the surface, all of which reduce the accuracy of the inspection. For thinner cold-rolled steel sheets, the last section during transport is prone to bending due to contact between the bottom and the conveyor rollers. This can obstruct or even alter the shape of the light emitted by the image sensor, affecting the inspection results and leading to inaccurate findings. Summary of the Invention

[0004] In view of the above problems, this application provides a surface defect detection device for cold-rolled steel sheets to solve the technical problems in related technologies where surface impurities and oil stains on cold-rolled steel sheets are detected as defects, and the bending phenomenon at the end of thin cold-rolled steel sheets due to lack of force support both affect the detection results. To achieve the above objective, this application provides the following technical solution.

[0005] An embodiment of this application discloses a surface defect detection device for cold-rolled steel sheets, comprising a conveying unit, a cleaning unit, and a detection unit. The cleaning unit and the detection unit are respectively disposed on the left and right sides of the conveying unit. The cleaning unit cleans the upper and lower surfaces of the cold-rolled steel sheet, and the detection unit detects defects on the upper and lower surfaces of the cold-rolled steel sheet. The conveying unit includes a support platform, on which multiple conveying rollers are uniformly rotatably connected in a linear fashion from left to right. A drive unit is commonly disposed at the front end of each conveying roller. The cleaning unit includes a lower cleaning section, disposed on the support platform between two conveying rollers located on the left side. A lower auxiliary section is disposed on the lower cleaning section. The upper end is symmetrically fixedly installed with guide plates. The upper cleaning part is connected to the opposite ends of the guide plates. A rectangular linkage plate is connected between the upper cleaning part and the detection unit. An upper auxiliary part is provided at the upper end of the rectangular linkage plate. The detection unit includes a lower detection part. The lower detection part is fixedly installed between two conveying rollers on the right side of the support platform. Support parts are provided on both the left and right sides of the lower detection part on the support platform. Linkage parts are symmetrically arranged at the front and back of the support parts. Limit plates are symmetrically fixedly installed at the upper end of the support platform. The upper detection part is slidably connected to the opposite ends of the limit plates. A control part is provided between the lower detection part and the upper detection part.

[0006] According to an embodiment of the present invention, the drive unit includes a pulley, and pulleys are fixedly installed at the front ends of the conveying rollers. An anti-interference wheel is rotatably connected between the two conveying rollers located at the front end of the support platform and on the right side. All pulleys are connected by a transmission belt. The anti-interference wheel is located on the upper side of the transmission belt to prevent the transmission belt from contacting the square guide rod and interfering with the rotation of the transmission belt. A scraper is fixedly installed on the right side of the leftmost conveying roller on the support platform.

[0007] According to an embodiment of the present invention, the lower cleaning section includes a rectangular frame plate. A rectangular frame plate is fixedly installed on the support platform between two conveying rollers located on the left side. Rotating groups are symmetrically arranged inside the rectangular frame plate. Each rotating group is composed of round-headed plates symmetrically arranged front and back. The center of the round-headed plates is threadedly connected to the rectangular frame plate. The round-headed plates gradually slope downward from left to right. Cleaning rollers are arranged on the upper left and lower right sides between the corresponding round-headed plates. Circular slots are opened at both ends of the cleaning rollers. Threaded posts are threadedly connected to the upper left and lower right sides of the round-headed plates. The threaded posts cooperate with the circular slots. A rectangular plate is fixedly installed on the lower auxiliary section. Extrusion plates are fixedly installed at the four corners of the upper part of the rectangular plate. The extrusion plates are slidably connected to the corresponding round-headed plates. Impurities on the surface of the cleaning rollers are scraped off by scraper plates, extending the service life of the cleaning rollers and preventing impurities on the surface of the cleaning rollers from adhering to the surface of the cold-rolled plate again.

[0008] According to an embodiment of the present invention, the lower auxiliary part includes a right-angle bracket, a scraper plate is fixedly installed between the front and rear corresponding round head plates and directly below the cleaning roller on the left side, a right-angle bracket is fixedly installed at the lower rear end of the support platform, a distance control cylinder is fixedly installed at the upper horizontal section of the right-angle bracket, and a rectangular plate is provided at the telescopic end of the distance control cylinder.

[0009] According to an embodiment of the present invention, the lower extrusion section includes a rectangular plate, and a rectangular plate is fixedly installed on one telescopic end of a distance control cylinder. Extrusion plates are fixedly installed at the four corners of the upper end of the rectangular plate. The extrusion plates are slidably connected to the corresponding round head plates. The structure of the upper extrusion section is the same as that of the lower extrusion section, except that the parts are arranged in a mirror image.

[0010] According to an embodiment of the present invention, the structure of the upper cleaning part is the same as that of the lower cleaning part, except that the parts are arranged in a mirror image. A scraper box is fixedly installed between the front and rear corresponding round head plates of the upper cleaning part. The scraper box and the left end of the cleaning roller on the left side abut against each other. The opposite ends of the guide plates are slidably connected to the rectangular frame plate of the upper cleaning part.

[0011] According to an embodiment of the present invention, the upper auxiliary part includes a right-angle bracket II. The left end of the upper image sensor is fixedly connected to the rectangular frame plate on the upper cleaning part through a rectangular linkage plate. The upper end of the rectangular linkage plate is fixedly installed with the right-angle bracket II. The lower end of the horizontal section of the right-angle bracket II is fixedly installed with a distance control cylinder II. The telescopic end of the distance control cylinder II is fixedly connected to the rectangular plate in the upper extrusion part.

[0012] According to an embodiment of the present invention, the support part includes an arc-shaped plate. Arc-shaped plates are fixedly installed on the support platform and on both the left and right sides of the lower fixed shell. A movable plate is slidably connected to the middle of the arc-shaped plate facing the lower fixed shell. Multiple connecting springs are fixedly connected between the movable plate and the arc-shaped plate. The connecting springs are evenly arranged linearly back and forth. A support plate is slidably connected to the movable plate facing the lower fixed shell. Multiple connecting springs are fixedly connected between the support plate and the movable plate. The connecting springs are evenly arranged linearly back and forth. The front and rear ends of the support plate are slidably connected to the support platform.

[0013] According to an embodiment of the present invention, the linkage part includes a square guide rod. The support platform is symmetrically and fixedly installed with square guide rods that penetrate the support platform. Square sleeve blocks are slidably connected to the square guide rods. An anti-detachment block is fixedly installed at the end of the square guide rod away from the support platform. An inclined linkage rod is hinged between the support plate and the square sleeve blocks.

[0014] According to an embodiment of the present invention, the control unit includes a threaded rod, and threaded rods are rotatably connected to both the front and rear sides of the image sensor. The threaded rods on the front and rear sides are respectively threadedly connected to the corresponding sliding plates. A second pulley is fixedly installed on the upper end of each threaded rod, and the two second pulleys are connected by a transmission belt. A rotating handle is fixedly installed on the upper end of the threaded rod on the front side. An inclined plate is hinged between the sliding plate and the corresponding square sleeve block.

[0015] According to an embodiment of the present invention, the lower detection unit includes an image sensor. The image sensor is fixedly mounted on square guide rods on both the front and rear sides. A charge integrator, a digital-to-analog converter, a digital signal processor, and an image output terminal are fixedly mounted on the support platform. The image sensor is electrically connected to the charge integrator, the charge integrator is electrically connected to the digital-to-analog converter, the digital-to-analog converter is electrically connected to the digital signal processor, and the digital signal processor is electrically connected to the image output terminal. An LED light strip is fixedly mounted on the upper end of the image sensor. The charge integrator, digital-to-analog converter, digital signal processor, and image output terminal are all prior art and are not shown in the accompanying drawings. The upper detection unit includes a sliding plate. Sliding plates are slidably connected to opposite sides of the limiting plate. The image sensor is fixedly connected to both sliding plates. An LED light strip is fixedly mounted on the lower end of the image sensor.

[0016] As can be seen from the above technical solutions, the present invention has the following advantages:

[0017] 1. In this invention, through the cooperation of the control unit, upper detection unit, linkage unit, support unit, and rectangular linkage plate, the upper cleaning unit is ensured to be in close contact with the upper surface of the cold-rolled plate. The deformed support unit supports the cold-rolled plate located on the lower detection unit, keeping the cold-rolled plate in a horizontal state at all times. This prevents the cold-rolled plate from bending due to lack of support between the lower and upper detection units when its left end is not supported by the middle conveyor roller during its movement to the right. The lower and upper cleaning units clean the upper and lower surfaces of the cold-rolled plate, preventing impurities and oil stains on the surface of the cold-rolled plate from affecting the detection results. As needed, the cleaning roller can be quickly limited and replaced using threaded pins, ensuring the cleaning effect of the cleaning roller on the cold-rolled plate and thus guaranteeing the accuracy of the detection results.

[0018] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the cold-rolled steel plate surface defect detection equipment provided by the embodiments of this application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 A front-view stereoscopic structure diagram provided according to an embodiment of the present invention is shown.

[0021] Figure 2 The diagram shows a front-view stereoscopic structure of the present invention with the support platform removed.

[0022] Figure 3 A schematic diagram of the front view of the present invention with the support platform removed is shown.

[0023] Figure 4 A schematic diagram of the front view of the present invention is shown.

[0024] Figure 5 A top cross-sectional view of the threaded insert and cleaning roller is shown.

[0025] The above figures include the following reference numerals:

[0026] 1. Conveying Unit; 11. Support Platform; 12. Conveying Roller; 13. Drive Unit; 131. Pulley 1; 132. Anti-interference Wheel; 133. Transmission Belt 1; 134. Scraper; 2. Cleaning Unit; 21. Lower Cleaning Section; 211. Rectangular Frame Plate; 212. Round Head Plate; 213. Cleaning Roller; 214. Threaded Insert; 215. Rectangular Plate; 216. Extrusion Plate; 22. Lower Auxiliary Section; 221. Right Angle Bracket 1; 222. Scraper; 223. Distance Control Cylinder 1; 23. Guide Plate; 24. Upper Cleaning Section; 241. Scraper Box; 25. Rectangular Linkage Plate; 26. Upper Auxiliary Section; 261. Straight 262. Angle bracket 2; 3. Distance control cylinder 2; 4. Detection unit; 5. Lower detection part; 6. Image sensor; 7. LED light strip; 8. Support part; 9. Arc plate; 10. Moving plate; 11. Connecting spring; 12. Support plate; 13. Connecting spring 2; 14. Linkage part; 15. Square guide rod; 16. Square sleeve block; 17. Anti-detachment block; 18. Inclined linkage rod; 19. Limiting plate; 20. Upper detection part; 21. Control part; 22. Threaded rod; 23. Belt pulley 2; 24. Transmission belt 2; 35. Rotating handle; 366. Inclined plate. Detailed Implementation

[0027] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] See Figure 1 and Figure 4 A surface defect detection device for cold-rolled steel sheets includes a conveying unit 1, a cleaning unit 2, and a detection unit 3. The cleaning unit 2 and the detection unit 3 are respectively disposed on the left and right sides of the conveying unit 1. The cleaning unit 2 cleans the upper and lower surfaces of the cold-rolled steel sheet, and the detection unit 3 detects defects on the upper and lower surfaces of the cold-rolled steel sheet. The conveying unit 1 includes a support platform 11, on which multiple conveying rollers 12 are evenly rotatably connected in a linear fashion from left to right. A drive unit 13 is disposed at the front end of each conveying roller 12. The cleaning unit 2 includes a lower cleaning part 21, which is disposed between two conveying rollers 12 on the left side of the support platform 11. A lower auxiliary part 22 is disposed on the lower cleaning part 21. The upper end of the support platform 11 is symmetrically fixedly installed front and back. A guide plate 23 is provided, and an upper cleaning part 24 is connected to the opposite ends of the guide plate 23. A rectangular linkage plate 25 is provided between the upper cleaning part 24 and the detection unit 3. An upper auxiliary part 26 is provided at the upper end of the rectangular linkage plate 25. The detection unit 3 includes a lower detection part 31. The lower detection part 31 is fixedly installed between two conveying rollers 12 on the right side of the support platform 11. Support parts 32 are provided on the support platform 11 on both the left and right sides of the lower detection part 31. Linkage parts 33 are symmetrically arranged in front and behind the support parts 32. Limiting plates 34 are symmetrically fixedly installed in front and behind the upper end of the support platform 11. The upper detection part 35 is slidably connected to the opposite ends of the limiting plates 34. A control part 36 is provided between the lower detection part 31 and the upper detection part 35.

[0029] See Figure 3 , Figure 4 and Figure 5The lower cleaning section 21 includes a rectangular frame plate 211. The rectangular frame plate 211 is fixedly installed between two conveying rollers 12 on the left side of the support platform 11. Rotating groups are symmetrically arranged within the rectangular frame plate 211. Each rotating group consists of symmetrically arranged round-headed plates 212. The center of the round-headed plates 212 is threadedly connected to the rectangular frame plate 211. The round-headed plates 212 gradually slope downwards from left to right. Cleaning rollers 213 are arranged on the upper left and lower right sides between the corresponding round-headed plates 212. Circular openings are formed at both ends of the cleaning rollers 213. The slot and the upper left and lower right sides of the round head plate 212 are threaded with threaded inserts 214. The threaded inserts 214 cooperate with the round slot. A rectangular plate 215 is fixedly installed on the lower auxiliary part 22. Extrusion plates 216 are fixedly installed at the four corners of the upper end of the rectangular plate 215. The extrusion plates 216 are slidably connected with the corresponding round head plates 212. The scraper plate 222 scrapes away the impurities on the surface of the cleaning roller 213, extending the service life of the cleaning roller 213 and preventing the impurities on the surface of the cleaning roller 213 from adhering to the surface of the cold rolled plate again.

[0030] See Figure 2 , Figure 3 and Figure 4 The support portion 32 includes an arc-shaped plate 321. Arc-shaped plates 321 are fixedly installed on the support platform 11 on both the left and right sides of the lower detection portion 31. A movable plate 322 is slidably connected to the middle of the arc-shaped plate 321 facing the lower detection portion 31. Multiple connecting springs 323 are fixedly connected between the movable plate 322 and the arc-shaped plate 321. The connecting springs 323 are evenly arranged linearly back and forth. A support plate 324 is slidably connected to the movable plate 322 facing the lower detection portion 31. Multiple connecting springs 325 are fixedly connected between the support plate 324 and the movable plate 322. The connecting springs 325 are evenly arranged linearly back and forth. The front and rear ends of the support plate 324 are slidably connected to the support platform 11. Since the lower detection portion 31 and the upper detection portion 35 are staggered, the lengths of the parts on the left and right sides of the support portion 32 are different. The length of the parts on the left support portion 32 is greater than the length of the parts on the right support portion 32.

[0031] See Figure 2 The linkage part 33 includes a square guide rod 331. The support platform 11 is symmetrically fixedly installed with square guide rods 331 that pass through the support platform 11. Square sleeve blocks 332 are slidably connected to the square guide rods 331. An anti-detachment block 333 is fixedly installed at the end of the square guide rod 331 away from the support platform 11. An inclined linkage rod 334 is hinged between the support plate 324 and the square sleeve block 332.

[0032] See Figure 2 and Figure 3The lower detection unit 31 includes an image sensor 311. The image sensor 311 is fixedly mounted on square guide rods 331 on both the front and rear sides. A charge integrator, a digital-to-analog converter, a digital signal processor, and an image output terminal are fixedly mounted on the support platform 11. The image sensor 311 is electrically connected to the charge integrator, the charge integrator is electrically connected to the digital-to-analog converter, the digital-to-analog converter is electrically connected to the digital signal processor, and the digital signal processor is electrically connected to the image output terminal. An LED light strip 312 is fixedly mounted on the upper end of the image sensor 311. The charge integrator, digital-to-analog converter, digital signal processor, and image output terminal are all prior art and are not shown in the figures. The upper detection unit 35 includes a sliding plate. Sliding plates are slidably connected to opposite sides of the limiting plate 34. The image sensor 311 is fixedly connected to the two sliding plates. An LED light strip 312 is fixedly mounted on the lower end of the image sensor 311.

[0033] See Figure 2 The control unit 36 ​​includes a threaded rod 361. The image sensor 311 is rotatably connected to the threaded rod 361 on both the front and rear sides. The threaded rods 361 on the front and rear sides are respectively threadedly connected to the corresponding sliding plates. The upper ends of the threaded rods 361 are fixedly mounted with pulleys 362. The two pulleys 362 are connected by a transmission belt 363. The upper end of the threaded rod 361 on the front side is fixedly mounted with a rotating handle 364. The sliding plate and the corresponding square sleeve block 332 are hinged together by an inclined plate 365.

[0034] According to the thickness of the cold-rolled sheet, turn the handle 364 to drive the threaded rod 361 to rotate, adjust the height of the upper detection part 35, and with the cooperation of the inclined plate 365, the square sleeve block 332 and the inclined linkage rod 334, the support plate 324 moves accordingly. According to the thickness of the cold-rolled sheet, change the distance between the support plates 324. Driven by the rectangular linkage plate 25, the upper cleaning part 24 on the upper side moves synchronously to ensure that the cleaning roller 213 of the upper cleaning part 24 is in close contact with the upper surface of the cold-rolled sheet.

[0035] The cold-rolled plate located on the lower detection section 31 is supported by the support plate 324 to ensure that the cold-rolled plate is always in a horizontal state. This prevents the cold-rolled plate from bending when it is not supported by the middle conveyor roller 12 at the left end during the movement to the right, which would block the light emitted from the lower detection section 31 or even change the shape of the area of ​​light shining on the cold-rolled plate and affect the detection results.

[0036] See Figure 2 and Figure 3The drive unit 13 includes pulleys 131. Each conveyor roller 12 has a pulley 131 fixedly mounted on its front end. An anti-interference wheel 132 is rotatably connected between the two conveyor rollers 12 located on the right side of the support platform 11. All pulleys 131 are connected by a transmission belt 133. The anti-interference wheel 132 is located on the upper side of the transmission belt 133 to prevent the transmission belt 133 from contacting the square guide rod 331 and interfering with the rotation of the transmission belt 133. A scraper 134 is fixedly mounted on the right side of the leftmost conveyor roller 12 on the support platform 11. The scraper 134 cleans the surface of the conveyor roller 12 that first comes into contact with the uncleaned cold-rolled plate, preventing impurities adhering to the surface of the conveyor roller 12 from scratching the surface of the cold-rolled plate that needs to be inspected later, thus damaging the surface of the cold-rolled plate to be cleaned and affecting the inspection results.

[0037] See Figure 3 The lower auxiliary part 22 includes a right-angle bracket 221. A scraper 222 is fixedly installed between the front and rear corresponding round head plates 212 and on the lower side of the cleaning roller 213 located on the left side. The right-angle bracket 221 is fixedly installed at the lower rear side of the support platform 11. A distance control cylinder 223 is fixedly installed at the upper horizontal section of the right-angle bracket 221. A rectangular plate 215 is provided at the telescopic end of the distance control cylinder 223. The scraper 222 scrapes away impurities on the surface of the cleaning roller 213, extending the service life of the cleaning roller 213 and preventing impurities on the surface of the cleaning roller 213 from adhering to the surface of the cold-rolled plate again.

[0038] See Figure 3 The structure of the upper cleaning part 24 is the same as that of the lower cleaning part 21, except that the parts are arranged in a mirror image. A scraper box 241 is fixedly installed between the corresponding round head plates 212 on the upper cleaning part 24. The scraper box 241 and the left end of the cleaning roller 213 on the left side abut against each other. The opposite ends of the guide plate 23 are slidably connected to the rectangular frame plate 211 of the upper cleaning part 24. After the scraper box 241 scrapes the impurities on the cleaning roller 213, the impurities can be collected to prevent them from falling downwards onto the surface of the cold-rolled plate, thus extending the service life of the cleaning roller 213 and preventing impurities on the surface of the cleaning roller 213 from adhering to the surface of the cold-rolled plate again.

[0039] See Figure 3 The upper auxiliary part 26 includes a right-angle bracket 261. The left end of the upper image sensor 311 is fixedly connected to the rectangular frame plate 211 on the upper cleaning part 24 through a rectangular linkage plate 25. The right-angle bracket 261 is fixedly installed on the upper end of the rectangular linkage plate 25. The distance control cylinder 262 is fixedly installed on the lower end of the horizontal section of the right-angle bracket 261. The telescopic end of the distance control cylinder 262 is fixedly connected to the rectangular plate 215 in the upper cleaning part 24.

[0040] At this time, the cold-rolled sheet is conveyed onto the conveyor rollers 12 via a belt conveyor. An external motor drives the conveyor rollers 12 to rotate. With the cooperation of pulley 131, anti-interference wheel 132, and drive belt 133, all the conveyor rollers 12 rotate together, conveying the cold-rolled sheet to the right. The cleaning rollers 213 clean the upper and lower surfaces of the cold-rolled sheet. Then, the image sensors 311 on both sides detect the upper and lower surfaces of the cold-rolled sheet. After the image sensors 311 have imaged the upper and lower surfaces of the cold-rolled sheet, the charge integrator converts the charge into voltage signals, which are then amplified by an amplifier circuit. These voltage signals are then processed by a digital-to-analog converter. The image is converted into a digital signal, then further processed and encoded by a digital signal processor. Finally, the detected image is displayed at the image output terminal, allowing comparison with standard requirements to determine whether the surface defects of the cold-rolled steel meet the standard. After a period of time, the surface of the cleaning roller 213 on the left side of the round-head plate 212 becomes dirty. Before the cold-rolled plate on the left side enters the support platform 11, after the detected cold-rolled plate has been completely cleaned, the first distance control cylinder 223 drives the rectangular plate 215 to move upward, and the second distance control cylinder 262 drives the rectangular plate 215 in the upper cleaning section 24 to move downward, thereby driving the cleaning roller 213 on the right side of the round-head plate 212 to move upward. When the plate is in close contact with the lower surface of the cold-rolled sheet, rotate the threaded pin 214 on the left side of the round head plate 212 so that the threaded pin 214 is no longer inserted into the round slot. Remove the cleaning roller 213 on the left side of the round head plate 212 and replace it. At this time, the cleaning roller 213 on the right side of the round head plate 212 can be used to continue cleaning the cold-rolled sheet. When the cleaning roller 213 on the right side becomes dirty, the rectangular plate 215 on it is moved down by the distance control cylinder 1 223 and the rectangular plate 215 on it is moved up by the distance control cylinder 262, so that the replaced cleaning roller 213 can clean the cold-rolled sheet again. Then the cleaning roller 213 on the right side of the round head plate 212 is cleaned again. After the cleaning roller 213 on the left side of the round-head plate 212 is replaced, the rectangular plate 215 is immediately moved down by the distance control cylinder 223, and the rectangular plate 215 in the upper cleaning section 24 is moved up by the distance control cylinder 262, so that the cleaning roller 213 on the left side can immediately clean the cold-rolled plate. The cleaning roller 213 on the right side of the round-head plate 212 has less contact time with the cold-rolled plate. After a long time, the cleaning roller 213 on the right side of the round-head plate 212 becomes dirty. The cleaning roller 213 on the right side of the round-head plate 212 can be replaced in the same way. Throughout the process, it is ensured that the cold-rolled plate is in constant contact with the cleaning roller 213 for cleaning.

[0041] The working principle of this invention is as follows: First step: According to the thickness of the cold-rolled sheet, the height of the upper detection part 35 is adjusted by the control part 36. With the cooperation of the linkage part 33, the support part 32 moves accordingly. Driven by the rectangular linkage plate 25, the upper cleaning part 24 on the upper side moves synchronously to ensure that the upper cleaning part 24 is in close contact with the upper surface of the cold-rolled sheet.

[0042] Step 2: The deformed support part 32 supports the cold-rolled plate located on the lower detection part 31, ensuring that the cold-rolled plate is always in a horizontal state. This prevents the cold-rolled plate from bending between the lower detection part 31 and the upper detection part 35 when the left end of the cold-rolled plate is not supported by the middle conveyor roller 12 during the movement to the right. This would block the light emitted by the lower detection part 31 and the upper detection part 35 or even change the shape of the area of ​​light shining on the cold-rolled plate, affecting the detection results.

[0043] Step 3: The cold-rolled plate located on the lower inspection section 31 is supported by the deformed support section 32 to ensure that the cold-rolled plate is always in a horizontal state. At this time, the cold-rolled plate is transported to the conveyor roller 12 by the external belt conveyor. The drive section 13 drives the conveyor roller 12 to rotate and transport the cold-rolled plate to the right. The lower cleaning section 21 and the upper cleaning section 24 clean the upper and lower surfaces of the cold-rolled plate. Then, the lower inspection section 31 and the upper inspection section 35 inspect the upper and lower surfaces of the cold-rolled plate. The results of the inspection are compared with the standard requirements to determine whether the surface defects of the cold-rolled steel meet the standard.

[0044] In the description of this invention, it should be understood that the terms "center," "middle," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "end," "axial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0045] Furthermore, the terms "first," "second," "number one," "number two," "one," and "two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral connection, or a sliding connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A surface defect detection device for cold-rolled steel sheets, characterized in that: It includes a conveying unit, a cleaning unit, and an inspection unit. The cleaning unit and the inspection unit are respectively located on the left and right sides of the conveying unit, and clean and inspect the upper and lower surfaces of the cold-rolled plate. The conveying unit includes a support platform, on which multiple conveying rollers are uniformly rotated linearly from left to right, and a drive unit is provided at the front end of the conveying rollers. The cleaning unit includes a lower cleaning section, which is located on the support platform and between two conveying rollers on the left side. A lower auxiliary section is provided on the lower cleaning section. Guide plates are symmetrically fixed at the upper end of the support platform. An upper cleaning section is provided at the opposite ends of the guide plates. A rectangular linkage plate is provided between the upper cleaning section and the detection unit. An upper auxiliary section is provided at the upper end of the rectangular linkage plate. The detection unit includes a lower detection part, which is fixedly installed on the support platform between two conveying rollers on the right side. Support parts are provided on the support platform on both the left and right sides of the lower detection part. Linkage parts are symmetrically arranged in front and behind the support parts. Limiting plates are symmetrically fixedly installed on the upper end of the support platform. The upper detection part is slidably connected to the opposite ends of the limiting plates. A control part is provided between the lower detection part and the upper detection part. The lower detection unit includes an image sensor, and the image sensor is fixedly installed on the square guide rods on both the front and rear sides. The upper detection part includes a sliding plate, and sliding plates are slidably connected to opposite sides of the limiting plate. An image sensor is fixedly connected to both sliding plates. An LED light strip is fixedly installed at the lower end of the image sensor. The linkage part includes a square guide rod. A square guide rod is symmetrically fixedly installed through the support platform. A square sleeve block is slidably connected to each square guide rod. An anti-detachment block is fixedly installed at the end of the square guide rod away from the support platform. An inclined linkage rod is hinged between the support plate and the square sleeve block. The lower cleaning section includes a rectangular frame plate. A rectangular frame plate is fixedly installed on the support platform between two conveying rollers located on the left side. Rotating groups are symmetrically arranged inside the rectangular frame plate. Each rotating group consists of symmetrically arranged round-headed plates. The center of the round-headed plates is threadedly connected to the rectangular frame plate. The round-headed plates gradually slope downward from left to right. Cleaning rollers are arranged on the upper left and lower right sides between the corresponding round-headed plates. Circular slots are opened at both ends of the cleaning rollers. Threaded pins are threadedly connected to the upper left and lower right sides of the round-headed plates. The threaded pins cooperate with the circular slots. The detection equipment also includes a rectangular plate that can be lifted up and down. Extrusion plates are fixedly installed at the four corners of the upper part of the rectangular plate. The extrusion plates are slidably connected to the corresponding round-headed plates.

2. The surface defect detection equipment for cold-rolled steel sheets according to claim 1, characterized in that: The drive unit includes a pulley, and pulleys are fixedly installed at the front ends of the conveying rollers. An anti-interference wheel is rotatably connected between the two conveying rollers on the right side of the front end of the support platform. All pulleys are connected by a transmission belt. The anti-interference wheel is located on the upper side of the transmission belt to prevent the transmission belt from contacting the square guide rod and interfering with the rotation of the transmission belt. A scraper is fixedly installed on the right side of the leftmost conveying roller on the support platform.

3. The surface defect detection equipment for cold-rolled steel sheets according to claim 1, characterized in that: The lower auxiliary part includes a right-angle bracket, a scraper plate is fixedly installed between the front and rear corresponding round head plates and on the lower side of the cleaning roller on the left side, a right-angle bracket is fixedly installed at the lower rear side of the support platform, a distance control cylinder is fixedly installed at the upper horizontal section of the right-angle bracket, and a rectangular plate is provided at the telescopic end of the distance control cylinder.

4. The surface defect detection equipment for cold-rolled steel sheets according to claim 1, characterized in that: The structure of the upper cleaning part is the same as that of the lower cleaning part, except that the parts are arranged in a mirror image. A scraper box is fixedly installed between the corresponding round head plates on the front and back of the upper cleaning part. The scraper box and the left end of the cleaning roller on the left side abut against each other. The opposite ends of the guide plates are slidably connected to the rectangular frame plate of the upper cleaning part.

5. The surface defect detection equipment for cold-rolled steel sheets according to claim 1, characterized in that: The upper auxiliary part includes a right-angle bracket two. The left end of the upper detection part is fixedly connected to the rectangular frame plate on the upper cleaning part through a rectangular linkage plate. The upper end of the rectangular linkage plate is fixedly installed with the right-angle bracket two. The lower end of the horizontal section of the right-angle bracket two is fixedly installed with a distance control cylinder two. The telescopic end of the distance control cylinder two is fixedly connected to the rectangular plate in the upper cleaning part.

6. The surface defect detection equipment for cold-rolled steel sheets according to claim 1, characterized in that: The support includes an arc-shaped plate. Arc-shaped plates are fixedly installed on the support platform and on both sides of the lower detection part. A movable plate is slidably connected to the middle of the arc-shaped plate facing the lower detection part. Multiple connecting springs are fixedly connected between the movable plate and the arc-shaped plate. The connecting springs are evenly arranged linearly back and forth. A support plate is slidably connected to the movable plate facing the lower detection part. Multiple connecting springs are fixedly connected between the support plate and the movable plate. The connecting springs are evenly arranged linearly back and forth. The front and rear ends of the support plate are slidably connected to the support platform.

7. The surface defect detection equipment for cold-rolled steel sheets according to claim 6, characterized in that: A charge integrator, a digital-to-analog converter, a digital signal processor, and an image output terminal are fixedly installed on the support platform. The image sensor is electrically connected to the charge integrator, the charge integrator is electrically connected to the digital-to-analog converter, the digital-to-analog converter is electrically connected to the digital signal processor, and the digital signal processor is electrically connected to the image output terminal. An LED light strip is fixedly installed on the top of the image sensor.

8. The surface defect detection equipment for cold-rolled steel sheets according to claim 1, characterized in that: The control unit includes threaded rods. Threaded rods are rotatably connected to both the front and rear sides of the image sensor. The threaded rods on the front and rear sides are threadedly connected to the corresponding sliding plates. Pulleys are fixedly installed on the upper ends of the threaded rods. The two pulleys are connected by a transmission belt. A rotating handle is fixedly installed on the upper end of the front threaded rod. An inclined plate is hinged between the sliding plate and the corresponding square sleeve block.

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