A compensation cleaning system for sheet metal surfaces and its control method

Abstract

This invention discloses a compensation cleaning system and its control method for sheet metal surfaces. The system includes a main sheet metal cleaning system, a surface inspection system, and a compensation cleaning system arranged sequentially along the sheet metal transport direction. The control method includes: S1, the sheet metal, after being cleaned by the main cleaning system, enters the surface inspection system for inspection. When the surface inspection system identifies a stripe color difference defect in the sheet metal, it sends the relevant information of the stripe color difference defect and the size information of the steel plate to the control system; S2, the control system controls the compensation cleaning system to compensate for the stripe color difference defect based on the received relevant information. This invention, by real-time detection of the surface quality after cleaning, promptly identifies faulty areas, locates the fault points, and performs compensation cleaning at the fault points to ensure that the final cleaning effect meets the requirements of subsequent processes.

Description

Technical Field

[0001] This invention belongs to the field of metal sheet processing technology, and particularly relates to a sheet surface cleaning system and its control method. Background Technology

[0002] In the manufacturing and processing of steel materials, the surface quality of the raw materials is crucial for subsequent processes. While traditional chemical pickling can achieve a certain cleaning effect, it often comes with problems such as environmental pollution and high energy consumption. In recent years, with increasing environmental awareness and technological advancements, abrasive waterjet cleaning has gradually gained popularity as a highly efficient and environmentally friendly surface treatment technology.

[0003] In the current wide strip (width ≥ 1250mm) abrasive waterjet cleaning method, there are many descaling nozzles. During daily use, if one of the nozzles is not properly maintained, and there is a difference in the pressure and amount of sand discharged from that nozzle, obvious stripe-like color difference will be left on the surface of the strip. This stripe-like color difference will affect the appearance of the finished steel plate and will also have a certain impact on the subsequent rolling. The conventional solution to this stripe-like color difference is to stop the machine to maintain the nozzle and continue cleaning after it is restored to normal. The conventional method has the following significant drawbacks: (1) From the time the stripe appears to the time the machine is stopped, the defective steel plates produced need to be cleaned again; (2) Stopping the machine for maintenance due to a small amount of color difference stripe will disrupt the continuity of production and greatly reduce production efficiency. Summary of the Invention

[0004] The technical problem to be solved by this invention is that current abrasive waterjet cleaning technology can cause striped color differences on the board surface when the nozzle malfunctions occasionally. Removing the color difference will lead to resource waste and reduced production efficiency. This invention proposes a compensation cleaning system and control method for the board surface. By real-time detection of the surface quality after cleaning, the fault area can be detected in time, the fault point can be located, and compensation cleaning can be performed on the fault point to ensure that the final cleaning effect meets the requirements of subsequent processes.

[0005] To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows:

[0006] A compensation cleaning system for the surface of a board includes a main board cleaning system, a surface inspection system, and a board compensation cleaning system arranged sequentially along the board transport direction.

[0007] The surface inspection system is used to collect image signals of the board surface after it has been cleaned by the main board cleaning system, identify and generate relevant information on stripe color difference defects present in the image signals;

[0008] The plate compensation and cleaning system is used to clean existing stripe color difference defects again;

[0009] It also includes a control system; the control system is used to receive relevant information about the stripe color difference defects formed by the surface inspection system, and control the plate compensation and cleaning system to clean the existing stripe color difference defects again according to the information.

[0010] As a further preferred embodiment of the above technical solution, the plate compensation cleaning system includes a compensation cleaning device and an auxiliary device for providing cleaning abrasive and cleaning media to the compensation cleaning device; the compensation cleaning device includes a compensation cleaning nozzle, a driving device, and a slide bar arranged perpendicular to the plate conveying direction, the compensation cleaning nozzle is movably connected to the slide bar and driven by the driving device to move along the direction perpendicular to the plate conveying direction; the driving device is controlled by a control system.

[0011] As a further preferred embodiment of the above technical solution, the compensating cleaning nozzle is identical to the cleaning nozzle in the main cleaning system for the board, and the vertical distance between the compensating cleaning nozzle and the board is greater than the vertical distance between the cleaning nozzle in the main cleaning chamber and the board. The target distance of the compensating cleaning nozzle is greater than the target distance of the nozzles in the main cleaning system for the board, so that the cleaning range of a single compensating nozzle is greater than that of the main cleaning system for the board, thus completely covering the stripe defects generated during the cleaning process of the main cleaning system for the board.

[0012] As a further preferred embodiment of the above technical solution, multiple compensation cleaning devices are arranged along the conveying direction of the sheet metal. The compensation cleaning nozzles of different compensation cleaning devices are arranged vertically at intervals, and the straight-line distance between adjacent compensation cleaning devices along the conveying direction of the sheet metal is greater than or equal to 300mm. The interval arrangement can avoid the influence between different compensation cleaning devices and prevent the abrasive particles from impacting each other and affecting the stability of the system.

[0013] As a further preferred embodiment of the above technical solution, the movable distance of the compensation cleaning nozzle is greater than the width of the board, so as to avoid cleaning blind spots.

[0014] As a further preferred embodiment of the above technical solution, the compensation cleaning device is provided with three units above the upper surface and three units below the lower surface of the plate.

[0015] As a further preferred embodiment of the above technical solution, the slide rod is a ball screw, and the compensating cleaning nozzle is fixedly connected to the slide block. A threaded hole is provided inside the slide block, forming a helical motion pair between the slide block and the ball screw through the threaded hole. The driving device drives the ball screw to convert the rotational motion into linear reciprocating motion of the slide block along the axis of the ball screw, thereby realizing the movement of the compensating cleaning nozzle. The driving device also converts the rotational motion into linear reciprocating motion of the slide block in the width direction, achieving high-precision positioning of the compensating cleaning nozzle in the width direction of the steel plate (positioning accuracy ±0.1mm, which meets the technical requirements for accurate positioning and effective cleaning of stripe defects).

[0016] As a further preferred embodiment of the above technical solution, a retractable rubber protective cover is provided between the slider and the ball screw. One end of the cover is embedded in the wall of the plate compensation and cleaning system to achieve a seal, and the other end is attached to the side of the slider. It achieves dynamic protection of compression and tension as the slider reciprocates, effectively preventing abrasive rebound from damaging the screw thread.

[0017] As a further preferred embodiment of the above technical solution, the auxiliary device includes an abrasive sorting and recovery device, a high-pressure water supply device, and a wastewater circulation device; the abrasive sorting device is used to screen and recover the abrasive used by the compensation cleaning device and then transport it to the compensation cleaning nozzle; the high-pressure water supply device is used to pressurize water and then transport it to the compensation cleaning nozzle; the wastewater circulation device is used to settle and filter the water used by the compensation cleaning device and then transport it to the high-pressure water supply device.

[0018] The abrasive sorting and recovery device consists of a sand supply tank, a sand pump, a filter screen, a slurry pump, and a hydrocyclone. After the compensating cleaning nozzle cleans the steel plate, the mixture of abrasive and wastewater accumulates in the compensating cleaning tank. Usable abrasive is screened by the filter screen and settles to the bottom of the tank, then pumped to the sand supply tank by the sand pump. The sand supply tank is located above the compensating cleaning tank and is connected to the compensating cleaning nozzle via a pipe. The abrasive in the sand supply tank flows into the compensating cleaning nozzle cavity due to its own gravity and the negative pressure of the nozzle. After mixing with high-pressure water in the cavity, it is sprayed out from the nozzle of the nozzle and impacts the surface of the steel plate. The heavier, intact abrasive particles in the cleaned abrasive and wastewater mixture are filtered and settle to the bottom of the compensating cleaning tank to continue the above cycle; the lighter mixture of broken abrasive and scale is suspended in the upper layer of the water flow and flows out from the overflow port of the compensating cleaning tank, then pumped to the hydrocyclone by the slurry pump. The hydrocyclone is positioned directly above the compensation and cleaning tank and is used to separate usable abrasive, broken abrasive, and oxide scale. The mixture pumped in by the slurry pump enters the hydrocyclone at a certain initial velocity. Based on the different densities of the usable abrasive, broken abrasive, and oxide scale, the hydrocyclone separates the usable abrasive and sends it to the compensation and cleaning tank for reuse, while selecting out the less dense oxide scale and broken abrasive and discharging them into the sedimentation tank.

[0019] The wastewater circulation device consists of a sedimentation tank and a filter tank. The sedimentation tank is used to store and settle the wastewater discharged from the cleaning device, while the filter tank filters the settled turbid water to the clean water quality required by the high-pressure pump and discharges it to the intermediate water tank for use by the high-pressure pump.

[0020] The high-pressure water supply device consists of a high-pressure pump and an intermediate water tank. The clean water stored in the intermediate water tank is pumped to the inlet side of the high-pressure pump, and after being pressurized to about 50 MPa by the high-pressure pump, it is supplied to the compensation cleaning nozzle through the pipeline.

[0021] As a further preferred embodiment of the above technical solution, the surface inspection system includes an image signal collection device and a defect determination device. The defect determination device has a built-in defect database of the board surface. The defect determination device receives several image signals continuously collected by the image signal collection device, processes the image signals, and identifies defects on each image signal according to the defect database. When defects are identified at the same position along the board transport direction in n consecutive images (n is a preset value determined according to the board transport speed and inspection accuracy requirements), it is determined that there is a stripe color difference defect in that position area, and relevant information such as the length, coordinate position, and board size of the stripe color difference defect is generated. The defect determination device generates relevant information of the stripe color difference defect according to the following process: For ease of subsequent description, in the top view, the rectangular outline of the upper surface of the board is defined as follows, clockwise as: East Line → South Line → West Line → North Line. All plates are aligned with the north edge and moved eastward. The origin is the intersection of the east and north edges of the rectangular outline on the upper surface of the plate. The X-axis is the opposite direction of the plate's movement, and the Y-axis (the width direction of the plate) is rotated 90° counterclockwise. The defect detection device generates the length, coordinate position, and surface information of the stripe color difference based on the starting and ending coordinates of the stripe color difference. Simultaneously, it generates the plate's length and width dimensions.

[0022] As a further preferred embodiment of the above technical solution, the image signal collection device is provided both above the upper surface and below the lower surface of the plate.

[0023] As a further preferred embodiment of the above technical solution, a squeeze roller and an air knife for drying the surface of the board are sequentially arranged between the main cleaning system and the surface inspection system.

[0024] Based on the same technical concept, the present invention also provides a control method for the compensation cleaning system for the surface of the plate described in the above technical solution, comprising the following steps:

[0025] S1. After being cleaned by the main plate cleaning system, the plate enters the surface inspection system for inspection. When the surface inspection system identifies that the plate has stripe color difference defects, it sends the relevant information of the stripe color difference defects and the size information of the steel plate to the control system.

[0026] S2. The control system controls the sheet material compensation and cleaning system to compensate and clean stripe color difference defects based on the received relevant information.

[0027] As a further preferred embodiment of the above technical solution, the S2 board compensation cleaning system is equipped with several compensation cleaning nozzles. When the surface detection system simultaneously identifies multiple stripe color difference defects on the board, the control system arranges the compensation cleaning nozzles sequentially according to the location of the stripe color difference defects, based on the principle of proximity, to perform compensation cleaning.

[0028] As a further preferred embodiment of the above technical solution, the control system divides the board into several strip regions along its width. The upper and lower surfaces of the board are each divided into three strip regions along their width. The number of strip regions is the same as the number of compensation cleaning nozzles corresponding to the upper and lower surfaces. The midpoints of the strip regions along their width are used as the starting points for each compensation cleaning nozzle, establishing a correspondence between the compensation cleaning nozzles and the strip regions. When the number of stripe color difference defects is 1, the compensation cleaning nozzle corresponding to the area containing the stripe color difference defect is controlled to clean it. When the number of stripe color difference defects is 2 and they are located in different stripes... When the area is defined, the compensation cleaning nozzles corresponding to each stripe area are controlled to clean different stripe color differences. When the number of stripe color difference defects is 2 and they are located in the same stripe area, the compensation cleaning nozzles corresponding to that stripe area are controlled to clean the stripe color difference closest to it, and other stripe color differences are cleaned by the compensation cleaning nozzles closest to it in adjacent stripe areas. When the number of stripe color difference defects is 3, the compensation cleaning nozzles corresponding to the two side stripe areas are controlled to clean the stripe color differences on both sides respectively, and the compensation cleaning nozzles corresponding to the middle stripe area are controlled to clean the stripe color difference in the middle.

[0029] As a further preferred embodiment of the above technical solution, the working pressure of the compensation cleaning nozzle is higher than that of the cleaning nozzle in the main cleaning system of the board.

[0030] Compared with the prior art, the advantages of the present invention are as follows:

[0031] This invention combines image recognition, intelligent scheduling algorithms, and existing abrasive high-pressure water jet technology to form a closed-loop processing system. This solves the production interruption problem caused by nozzle malfunctions in traditional acid-free cleaning processes. The invention adds a surface detection system after the existing main cleaning system for sheet metal, promptly detecting stripe color difference defects caused by nozzle abnormalities within the main cleaning system's housing. For these areas requiring compensation cleaning, a compensation cleaning system is designed, driven by a small high-pressure pump, consuming only 3% to 5% of the main cleaning unit's energy, achieving intensive resource utilization. This compensation cleaning system can promptly and accurately identify the fault status of individual nozzles. Upon detecting a fault, no machine shutdown is required; the compensation cleaning mechanism performs targeted compensation cleaning for stripe color differences that may be caused by the faulty nozzle, ensuring that the entire batch cleaning work is not affected by the faulty nozzle and can be completed smoothly. After the entire batch cleaning task is completed, the faulty nozzle is then specifically maintained, effectively avoiding production interruptions caused by a single nozzle malfunction, significantly improving production efficiency, ensuring the continuity of cleaning work and the stability of cleaning quality, and achieving efficient and accurate compensation cleaning for stripe color differences. The compensation cleaning system is connected in series with the main cleaning system for the board material to form a dynamic closed loop of "detection-positioning-compensation". This innovatively solves the technical problem of handling single nozzle failures, eliminates the need for building a separate system, and is easy and cost-effective to construct. Attached Figure Description

[0032] 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram (front view) of the compensation cleaning system for the surface of the sheet metal in Example 1.

[0034] Figure 2 This is a schematic diagram (top view) of the surface inspection system and compensation cleaning system of Example 1.

[0035] Legend:

[0036] 1. Main cleaning system for sheet metal; 2. Surface inspection system; 21. Camera; 3. Compensation cleaning system for sheet metal; 31. Compensation cleaning nozzle; 32. Drive unit; 33. Ball screw; 34. Slider; 35. Retractable rubber protective cover; 36. Bearing with seat; 4. Squeeze roller; 5. Air knife; 61. Sand supply tank; 62. Sand pump; 63. Filter screen in the housing; 64. Slurry pump; 65. Hydrocyclone; 71. Sedimentation tank; 72. Filter tank; 81. High-pressure pump; 82. Intermediate water tank. Detailed Implementation

[0037] To facilitate understanding of the present invention, the present invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of protection of the present invention is not limited to the following specific embodiments.

[0038] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0039] Unless otherwise specified, all instruments and equipment used in this invention can be purchased on the market or obtained by existing methods.

[0040] Example 1:

[0041] The board surface compensation cleaning system of this embodiment includes a main board cleaning system 1, a surface detection system 2 and a board compensation cleaning system 3 arranged sequentially along the board transport direction, and also includes a control system;

[0042] The surface inspection system 2 is used to collect image signals from the surface of the steel plate after it has been cleaned by the main cleaning system 1, and to identify and generate information related to stripe color difference defects in the image signals. Specifically, the surface inspection system 2 includes an image signal collection device and a defect judgment device. The defect judgment device uses an industrial control computer. The image signal collection device consists of cameras 21 with built-in flashes, with one set on each of the upper and lower surfaces. These cameras are used to collect image information from the upper and lower surfaces of the steel plate, respectively. The two cameras 21 used to capture images of the upper and lower surfaces are separated by a partition to avoid light interference between them, so that the images captured by the cameras 21 can more accurately represent the defect characteristics. The cameras 21 transmit the captured images to the defect judgment device at a frame rate of 25 fps or higher (the number of frames is determined based on the balance between the steel plate transportation speed and the detection accuracy). In the positioning device, the defect judgment device has a built-in defect database of the plate surface. The defect judgment device divides each received frame of photo into a 25mm×25mm block area, compares the area with the defects in the database, and determines whether the block area in each frame of photo is qualified or has defects. It also identifies the defects on each image signal according to the defect database. After the entire steel plate has passed through the camera 21, if a defect is identified at the same position along the plate transportation direction in 25 consecutive frames, it is determined that there is a stripe color difference defect in that position area, and the relevant information of the stripe color difference defect length, coordinate position, and plate size is generated (in this embodiment, 25 images are selected because the camera 21 has a frame rate of 25 frames per second, and 25 images are exactly one second, corresponding to the distance the steel plate travels in one second). The defect judgment device generates the relevant information of the stripe color difference defect according to the following process: For ease of subsequent description, in the top view, the rectangular outline of the upper surface of the plate is marked as: East line → South line → West line → North line in a clockwise direction. All plates are aligned with the north edge and moved eastward. The origin is the intersection of the east and north edges of the rectangular outline on the upper surface of the plate. The X-axis is the opposite direction of the plate's movement, and the Y-axis (the width direction of the plate) is rotated 90° counterclockwise. The defect detection device generates the length, coordinate position, and surface information of the stripe color difference based on the starting and ending coordinates of the stripe color difference. Simultaneously, it generates the plate's length and width dimensions.

[0043] The sheet material compensation cleaning system 3 is used to clean stripe color difference defects again. The sheet material compensation cleaning system 3 includes 6 sets of compensation cleaning devices (three sets each for the upper and lower surfaces of the sheet material) and auxiliary devices for providing cleaning abrasive and cleaning media to the compensation cleaning devices. The compensation cleaning device includes a compensation cleaning nozzle 31, a drive device 32 (a servo motor controlled by the control system), and a ball screw 33 arranged perpendicular to the sheet material conveying direction. The compensation cleaning nozzle 31 is fixedly connected to a slider 34. The slider 34 has a threaded hole. The slider 34 forms a helical motion pair with the ball screw 33 through the threaded hole. The drive device 32 drives the ball screw 33 to convert the rotational motion into linear reciprocating motion of the slider 34 along the axis of the ball screw 33, thereby realizing the movement of the compensation cleaning nozzle 31.

[0044] The compensating cleaning nozzle 31 is identical to the cleaning nozzles within the main cleaning system 1, and the vertical distance between the compensating cleaning nozzle 31 and the board is greater than the vertical distance between the cleaning nozzles within the main cleaning system 1 and the board. The target distance of the compensating cleaning nozzle 31 is greater than the target distance of the nozzles in the main cleaning system 1, ensuring that the cleaning range of a single compensating cleaning nozzle 31 is greater than 25mm, thus covering stripe color difference defects within a width of 25mm generated during cleaning by the main cleaning system 1.

[0045] The compensation cleaning nozzles 31 of different compensation cleaning devices are arranged vertically at intervals, and the straight-line distance between adjacent compensation cleaning devices along the conveying direction of the plate is greater than or equal to 300mm. The interval arrangement can avoid the influence between different compensation cleaning devices and prevent the abrasive from impacting each other and affecting the stability of the system.

[0046] A retractable rubber protective cover 35 is installed between the slider 34 and the ball screw 33. One end of the cover is embedded in the compensation cleaning box for sealing, and the other end is adhered to the side of the slider 34. It provides dynamic compression-tension protection as the slider 34 reciprocates, effectively preventing abrasive rebound from damaging the screw threads. For ease of illustration, only the protective cover of the ball screw 33 is shown in the figure. Both ends of the ball screw 33 are fixed using seated bearings 36 to prevent axial and circumferential runout of the compensation cleaning nozzle 31 during operation.

[0047] The auxiliary devices include an abrasive sorting and recovery device, a wastewater circulation device, and a high-pressure water supply device. The abrasive sorting and recovery device consists of a sand supply tank 61, a sand pump 62, a housing filter screen 63, a slurry pump 64, and a hydrocyclone 65, and is mainly used for the sorting and recovery of abrasives. After the compensation cleaning nozzle 31 cleans the steel plate, the mixture of abrasives and wastewater accumulates in the housing of the plate compensation cleaning system 3. The abrasives that can still be used are screened by the housing filter screen 63 and settle to the bottom of the housing, and are then pumped to the sand supply tank 61 by the sand pump 62. The sand supply tank 61 is located above the housing of the plate compensation cleaning system 3 and is connected to the compensation cleaning nozzle 31 through a pipe. The abrasives in the sand supply tank 61 flow into the cavity of the compensation cleaning nozzle 31 by their own gravity and the negative pressure of the compensation cleaning nozzle 31. After mixing with the high-pressure water in the cavity, they are sprayed out from the nozzle of the compensation cleaning nozzle 31 and hit the surface of the steel plate. After cleaning, the abrasive and wastewater mixture is separated. The heavier, intact abrasive particles are filtered and settle to the bottom of the plate compensation cleaning system 3, continuing the aforementioned cycle. The lighter mixture of broken abrasive and scale is suspended in the upper layer of the water flow and flows out from the overflow port of the plate compensation cleaning system 3, then is pumped by the slurry pump 64 to the hydrocyclone 65. The hydrocyclone 65 is located directly above the compensation cleaning tank and is used to separate the usable abrasive, broken abrasive, and scale. The mixture pumped by the slurry pump 64 enters the hydrocyclone 65 at a certain initial velocity. Based on the different densities of the usable abrasive, broken abrasive, and scale, the hydrocyclone 65 separates the usable abrasive and returns it to the plate compensation cleaning system 3 for reuse, while simultaneously selecting out the less dense scale and broken abrasive and discharging them into the sedimentation tank 71.

[0048] The wastewater circulation device consists of a sedimentation tank 71 and a filter tank 72. The sedimentation tank 71 is used to store and settle the wastewater discharged from the compensation and cleaning device. The filter tank 72 filters the turbid water after sedimentation to the clean water quality required by the high-pressure pump 81 and discharges it to the intermediate water tank 82 for use by the high-pressure pump 81.

[0049] The high-pressure water supply device consists of a high-pressure pump 81 and an intermediate water tank 82. The clean water stored in the intermediate water tank 82 is pumped to the water inlet side of the high-pressure pump 81. After being pressurized to about 50 MPa by the high-pressure pump 81, it is supplied to the compensation cleaning nozzle 31 through the pipeline.

[0050] The control system is a PLC, used to receive information about stripe color difference defects generated by the surface inspection system 2, and control the plate compensation cleaning system 3 to clean the stripe color difference defects again based on this information. In this embodiment, the control system divides the upper and lower surfaces of the steel plate into three regions along the width direction according to the received steel plate width signal y: region I (width range [0, y / 3)), region II (width range [y / 3, 2y / 3)), and region III (width range [2y / 3, y]). Simultaneously, according to the divided regions, compensation cleaning nozzles 31 (numbers 1, 2, 3, 4, 5, and 6) on the upper and lower surfaces are moved along the width direction of the steel plate to the midpoint of the Y-axis of region I, region II, and region III, respectively. The midpoint of the Y-axis for each region is the initial point of each compensation cleaning nozzle 31. No. 1 corresponds to region I on the upper surface, No. 2 to region II on the upper surface, No. 3 to region III on the upper surface, No. 4 to region I on the lower surface, No. 5 to region II on the lower surface, and No. 6 to region III on the lower surface. The movement of the compensation cleaning nozzle 31 is achieved by the control system controlling the drive device 32 (i.e., the servo motor) to rotate the ball screw 33 a certain number of times, thereby controlling the linear displacement of the slider 34 on the ball screw 33, and finally causing the compensation cleaning nozzle 31 fixed on the slider 34 to reach the predetermined position.

[0051] In this embodiment, a squeeze roller 4 and an air knife 5 for drying the surface of the board are also arranged sequentially between the main board cleaning system 1 and the surface inspection system 2.

[0052] The control method of the compensation cleaning system for the surface of the sheet metal in this embodiment includes the following steps:

[0053] Step 1: Taking the compensation cleaning of a 1650mm wide steel plate as an example, when the upper plate surface passes the camera 21, the flash is lit. The camera 21 takes a picture of the passing steel plate surface at a frame rate of 25FPs and transmits the picture to the image processing and defect judgment device to determine whether there are defects on the cleaned surface. If there are, the surface detection system 2 sends the surface where the stripe is located, the Y-axis coordinate position of the stripe, the stripe length, and the steel plate length information to the control system. The control system determines the area and specific location of the stripe color difference defect based on the received surface where the stripe is located and the Y-axis coordinate position information of the stripe.

[0054] After the control system determines the area and specific location of the stripe color difference defect, it simultaneously performs steps 2 and 3.

[0055] Step 2: Based on the area and specific location of the stripe color difference defect, the control system prioritizes controlling the corresponding compensation cleaning nozzle 31 to lock the stripe color difference defect, and then moves the corresponding compensation cleaning nozzle 31 to the cleaning position corresponding to the stripe color difference defect to complete the relevant compensation cleaning preparation.

[0056] When the surface inspection system 2 detects two stripe color difference defects on a surface of the steel plate, the control system determines whether the two stripe color difference defects are in the same area. If the two stripe color difference defects are in different areas, then step 2 is executed. If both stripe color difference defects are in area I, then the compensation cleaning nozzle 31 corresponding to area I prioritizes locking the stripe color difference defect with a smaller Y-axis coordinate, while the stripe color difference defect with a larger Y-axis coordinate is locked by the compensation cleaning nozzle 31 corresponding to area II. If both stripe color difference defects are in area II, then the compensation cleaning nozzle 31 corresponding to area II prioritizes locking the stripe color difference defect that is closer to it along the Y-axis direction, and the remaining stripe color difference defect is locked by the compensation cleaning nozzle 31 corresponding to either area I or area III that is closest along the Y-axis direction. If both stripe color difference defects are in area III, then the compensation cleaning nozzle 31 corresponding to area III prioritizes locking the stripe color difference defect with a larger Y-axis coordinate, while the stripe color difference defect with a smaller Y-axis coordinate is locked by the compensation cleaning nozzle 31 corresponding to area II. After locking is completed, the compensation cleaning nozzle 31 moves to the cleaning position corresponding to the stripe color difference defect that it has locked.

[0057] When the surface inspection system 2 detects three stripe color difference defects on a surface of the steel plate, the control system does not need to determine the region where the three stripe color difference defects are located. Instead, it directly locks the stripe color difference defect with the smallest Y-axis coordinate to the compensation cleaning nozzle 31 corresponding to zone I, locks the stripe color difference defect with the middle Y-axis coordinate to the compensation cleaning nozzle 31 corresponding to zone II, and locks the stripe color difference defect with the largest Y-axis coordinate to the compensation cleaning nozzle 31 corresponding to zone III. After locking, the compensation cleaning nozzle 31 moves to the cleaning position corresponding to the stripe color difference defect it has locked.

[0058] When the surface inspection system 2 detects ≥4 stripe color difference defects on a surface of the steel plate, the control system receives the information about the stripe color difference defects and performs relevant alarm processing, indicating that there are too many stripe color difference defects and the compensation and cleaning work cannot be completed.

[0059] Step 3: The control system starts timing. After time t1, the compensation cleaning nozzle 31 for locking stripe color difference defects is activated to begin compensation cleaning. After time t2, the compensation cleaning nozzle 31 is turned off, ending the compensation cleaning process, and the compensation cleaning nozzle 31 returns to its initial point. Where t1 = (L... N - x) / V, t2=l / V, t1 and t2 are in min; L N(N=1, 2, 3, 4, 5, 6) represents the distance of the Nth compensation cleaning nozzle 31 from the camera 21 of the surface inspection system 2 along the X-axis. When N=1, 2, 3, it represents the distance of the Nth compensation cleaning nozzle 31 from the upper surface camera 21 of the surface inspection system 2 along the X-axis. When N=4, 5, 6, it represents the distance of the Nth compensation cleaning nozzle 31 from the lower surface camera 21 of the surface inspection system 2 along the X-axis. The unit is mm. x is the length of the steel plate, in mm. V is the forward speed of the steel plate, in mm / min. l is the length of the stripe color difference defect, in mm.

[0060] In addition, L N It should also satisfy: L N ≥C+WV / nP; where C is the maximum length of the steel plate, mm; W is the maximum width of the steel plate, mm; V is the forward speed of the steel plate, mm / min; n is the motor speed, r / min; P is the lead of the ball screw 33, that is, the distance the slider 34 travels when the ball screw 33 rotates once, mm / r.

[0061] The above description is merely a preferred embodiment of the present invention, and the scope of protection of the present invention is not limited to the above embodiments. For those skilled in the art, improvements and modifications obtained without departing from the inventive concept should also be considered within the scope of protection of the present invention.

[0062] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A system for compensating for cleaning of a surface of a panel, characterized in that The plate main cleaning system (1), the surface detection system (2) and the plate compensation cleaning system (3) are sequentially arranged along the plate conveying direction. The surface detection system (2) is used for collecting image signals of the plate surface after being cleaned by the plate main cleaning system (1), identifying and forming related information of the stripe color difference defects existing in the image signals. The plate compensation cleaning system (3) is used for re-cleaning the existing stripe color difference defects. The plate compensation cleaning system (3) comprises a compensation cleaning device and an auxiliary device for providing cleaning abrasive and cleaning medium to the compensation cleaning device. The compensation cleaning device comprises a compensation cleaning nozzle (31), a driving device (32) and a slide rod arranged perpendicularly to the plate conveying direction. The compensation cleaning nozzle (31) is movably connected to the slide rod and is driven by the driving device (32) to move perpendicularly to the plate conveying direction. The driving device (32) is signal-connected to a control system. The compensation cleaning nozzle (31) is consistent with the cleaning nozzle in the plate main cleaning system (1), and the vertical distance between the compensation cleaning nozzle (31) and the plate is greater than the vertical distance between the cleaning nozzle in the plate main cleaning system (1) and the plate. A plurality of compensation cleaning devices are arranged along the plate conveying direction. The compensation cleaning nozzles (31) of different compensation cleaning devices are arranged in an up-down interval in the vertical direction, and the linear distance between adjacent compensation cleaning devices along the plate conveying direction is greater than or equal to 300 mm. Three compensation cleaning devices are arranged above the upper surface of the plate and below the lower surface of the plate. The auxiliary device comprises an abrasive sorting and recycling device, a high-pressure water supply device and a sewage recycling device. The abrasive sorting device is used for screening and recycling the abrasive used by the compensation cleaning device and then conveying the abrasive to the compensation cleaning nozzle (31). The high-pressure water supply device is used for pressurizing water and then conveying the water to the compensation cleaning nozzle (31). The sewage recycling device is used for filtering and then conveying the water used by the compensation cleaning device to the high-pressure water supply device. The control system is signal-connected to the surface detection system (2) and the plate compensation cleaning system (3). The control system is used for receiving the related information of the stripe color difference defects formed by the surface detection system (2) and controlling the plate compensation cleaning system (3) to re-clean the existing stripe color difference defects according to the information.

2. The compensating cleaning system of a panel surface according to claim 1, wherein, The slide rod is a ball screw (33). The compensation cleaning nozzle (31) is fixedly connected to a sliding block (34). A threaded hole is formed in the sliding block (34). A screw pair is formed between the threaded hole and the ball screw (33). The driving device (32) drives the ball screw (33) to convert the rotary motion into the linear reciprocating motion of the sliding block (34) along the axial direction of the ball screw (33), so as to realize the movement of the compensation cleaning nozzle (31).

3. A compensating cleaning system of a board surface according to claim 1 or 2, characterized in that, The surface detection system (2) comprises an image signal collecting device and a defect judging device, the defect judging device is internally provided with a defect database of the plate surface, the defect judging device obtains a plurality of image signals continuously collected by the image signal collecting device, processes the image signals, and identifies defects on each image signal according to the defect database, when defects are identified at the same position along the plate conveying direction in the continuous n images, it is determined that the position has a stripe color difference defect, and relevant information of the length, coordinate position and size of the plate of the stripe color difference defect is formed.

4. The compensating cleaning system of a board surface according to claim 3, wherein, The image signal collecting device is arranged above the upper surface and below the lower surface of the plate.

5. The compensating cleaning system of a board surface according to claim 1 or 2, characterized in that, The plate main cleaning system (1) and the surface detection system (2) are sequentially provided with a squeezing roller (4) and an air knife (5) for drying the surface of the plate.

6. A control method of a plate surface compensating cleaning system according to any one of claims 1 to 5, characterized in that, The method comprises the following steps: S1, the plate after being cleaned by the plate main cleaning system (1) enters the surface detection system (2) for detection, when the surface detection system (2) identifies that the plate has a stripe color difference defect, it sends relevant information of the stripe color difference defect and size information of the steel plate to the control system; S2, the control system controls the plate compensation cleaning system (3) to compensate and clean the stripe color difference defect according to the received relevant information.

7. The control method of the plate surface compensating cleaning system according to claim 6, wherein When the surface detection system (2) simultaneously identifies a plurality of stripe color difference defects on the plate in S2, the control system sequentially arranges the compensation cleaning nozzles (31) to compensate and clean according to the principle of proximity according to the positions of the stripe color difference defects.

8. The control method of the plate surface compensating cleaning system according to claim 7, wherein The control system divides the upper surface and the lower surface of the plate into three strip-shaped regions along the width direction, the number of strip-shaped regions is the same as the number of compensation cleaning nozzles (31) corresponding to the upper and lower surfaces, and the middle points of the strip-shaped regions in the width direction are sequentially taken as the starting points of the compensation cleaning nozzles (31), so as to establish the corresponding relationship between the compensation cleaning nozzles (31) and the strip-shaped regions; when the number of stripe color difference defects is 1, the compensation cleaning nozzle (31) corresponding to the region where the stripe color difference defect is located is controlled to clean; when the number of stripe color difference defects is 2 and the stripe color difference defects are located in different strip-shaped regions, the compensation cleaning nozzles (31) corresponding to each strip-shaped region are controlled to clean different stripe color differences; when the number of stripe color difference defects is 2 and the stripe color difference defects are located in the same strip-shaped region, the compensation cleaning nozzle (31) corresponding to the strip-shaped region is controlled to clean the stripe color difference closest to itself, and the other stripe color difference is cleaned by the compensation cleaning nozzle (31) closest to it in the adjacent strip-shaped region; when the number of stripe color difference defects is 3, the compensation cleaning nozzles (31) corresponding to the two side strip-shaped regions are controlled to clean the two side stripe color differences respectively, and the compensation cleaning nozzle (31) corresponding to the middle strip-shaped region is controlled to clean the middle stripe color difference.

9. The control method of the plate surface compensating cleaning system according to claim 6, wherein The working pressure of the compensation cleaning nozzle (31) is higher than the working pressure of the cleaning nozzle in the plate main cleaning system (1).

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