Galvanizing unit finishing machine cleaning system and cleaning method

Abstract

The application provides a hot galvanizing unit skin pass mill cleaning system and a cleaning method, which comprises: a conveying structure connected with a working tank; a cleaning device for cleaning the skin pass mill roll, a pressure gauge for detecting the water pressure of the conveying structure, a strip surface detection and analysis mechanism for detecting and analyzing the strip surface quality at the outlet of the skin pass mill to obtain strip surface quality data; and a controller for adjusting the pressure of the high-pressure pump and the cleaning angle and moving speed of the spray pipe structure of the cleaning device relative to the roll according to the strip surface quality data and the water pressure data. The conveying structure conveys the water source and provides power, the cleaning device is used for targeted cleaning of the roll, the pressure gauge is used for real-time monitoring of the water pressure, the strip surface detection and analysis mechanism is used for obtaining the quality data of the diagonal line area ratio, and then the controller is used for cooperative adjustment of the pump pressure and the spray pipe angle and moving speed based on the water pressure and the strip quality data, so that the skin pass mill roll is precisely cleaned, the strip surface defects are effectively reduced, and the strip quality qualified rate is improved.

Description

Technical Field

[0001] This invention relates to the field of hot-dip galvanizing unit finishing machine technology, and more specifically, to a cleaning system and cleaning method for hot-dip galvanizing unit finishing machines. Background Technology

[0002] The finishing mill plays a crucial role in continuous hot-dip galvanizing units, significantly improving strip shape and surface quality. However, zinc powder and dust always adhere to the surface of the hot-dip galvanized strip, and these particles stick to the roll surface when the strip enters the finishing mill, damaging the surface of subsequent incoming materials. Therefore, most finishing mills currently require water cleaning to clean the roll surface.

[0003] However, existing cleaning devices have problems: during water cleaning, excessive water pressure often damages the roll surface, resulting in oblique roll marks on the surface of the rolled strip. In addition, the spray angle of the nozzles onto the rolls has a significant impact on the cleaning effect. The nozzles in existing cleaning systems are fixed and cannot be dynamically adjusted to meet the needs of different strip surfaces. The pressure of the cleaning system and the movement speed of the nozzles can only be adjusted after the surface quality of the finished strip has been judged manually. These adjustments are usually made after a certain amount of surface defects have already occurred, thus generating defective products. Therefore, there is an urgent need for a solution that can dynamically adjust the cleaning system parameters by monitoring the surface quality of the strip in real time. Summary of the Invention

[0004] The main objective of this invention is to provide a cleaning system and method for the finished product of a hot-dip galvanizing unit, so as to at least solve the problem of defective products caused by the reliance on manual parameter adjustment in the water cleaning process in the prior art.

[0005] To achieve the above objectives, the first aspect of the present invention provides a cleaning system for a hot-dip galvanizing unit's finishing mill, comprising: a working tank for storing cleaning water; a conveying structure, wherein the inlet of the conveying structure is connected to the outlet pipe of the working tank, and a high-pressure pump is installed on the conveying structure; a cleaning device installed on the outlet side of the finishing mill for cleaning the mill rolls; the outlet of the conveying structure is connected to the inlet of the spray pipe structure of the cleaning device; the cleaning of the rolls by the spray pipe structure includes forward spraying and reverse spraying modes, wherein forward spraying refers to the spraying direction forming an acute angle with the tangent of any point on the roll surface when the roll rotates, and reverse spraying refers to the spraying direction forming an obtuse angle with the tangent of any point on the roll surface when the roll rotates; and a pressure gauge installed on the conveying structure. Located at the outlet end of the high-pressure pump, it is used to detect the water pressure of the conveying structure and output water pressure data; the strip surface inspection and analysis mechanism is set on the outlet side of the finishing machine, used to detect and analyze the surface quality of the strip at the outlet of the finishing machine, and obtain strip surface quality data; the controller is connected to the high-pressure pump, the cleaning device, the pressure gauge and the strip surface inspection and analysis mechanism respectively, and the controller is used to adjust the pressure of the high-pressure pump and the cleaning angle and moving speed of the nozzle structure of the cleaning device relative to the roll according to the obtained strip surface quality data and water pressure data, so that the strip surface quality data reaches a preset value, and the strip surface quality data includes the proportion of diagonal area.

[0006] Optionally, the hot-dip galvanizing unit's finishing cleaning system further includes: A heating device is installed on the working tank for heating the cleaning water in the working tank; A filtration device is disposed on the conveying structure and located between the outlet end of the high-pressure pump and the inlet of the nozzle structure.

[0007] Optionally, the filtration device is a multi-stage parallel structure, comprising at least one Y-type coarse filter and a precision filter cartridge.

[0008] Optionally, the finishing mill roll includes two support rolls and two work rolls located between the two support rolls, the cleaning device includes a first cleaning device and a second cleaning device arranged sequentially in a vertical direction, and the nozzle structure includes a first nozzle structure installed in the first cleaning device and a second nozzle structure installed in the second cleaning device; The first nozzle structure includes two first nozzle assemblies, and the second nozzle structure includes two second nozzle assemblies; Wherein, the two first nozzle assemblies are respectively opposite to one of the support rollers and one of the work rollers, and the two second nozzle assemblies are respectively opposite to another support roller and another work roller; The conveying structure includes a first conveying branch and a second conveying branch. The two outlets of the first conveying branch are respectively connected to the first nozzle assembly and the second nozzle assembly opposite to the two support rollers. The two outlets of the second conveying branch are respectively connected to the first nozzle assembly and the second nozzle assembly opposite to the two working rollers.

[0009] Optionally, two high-pressure pumps are installed in parallel on both the first and second conveying branches.

[0010] Optionally, the first cleaning device includes: Two sets of support frames are installed on the exit side of the two sets of optical finishing machine frames and are located at the same horizontal position; A horizontal guiding mechanism is mounted on the two sets of support frames; The executing mechanism includes: The housing is connected to the horizontal guide mechanism and moves horizontally between the two sets of support frames under the action of the horizontal guide mechanism. A servo motor, wherein the servo motor is disposed within the housing; A gear pair is fixed inside the housing. The input end of the gear pair is connected to the output end of the servo motor, and the output end of the gear pair is connected to the two first nozzle assemblies for adjusting the spray angle of the two first nozzle assemblies relative to the corresponding working roller and the support roller, respectively. The two first nozzle assemblies are connected to the conveying branch.

[0011] Optionally, the horizontal guide mechanism includes: A drive mechanism, which is mounted on one of the support frames; A transmission mechanism, wherein the input end of the transmission mechanism is fixedly connected to the output shaft of the drive mechanism; A ball screw is horizontally disposed between two support frames, with both ends of the screw rotatably passing through the two sets of support frames, and one end of the screw being connected to the output end of the transmission mechanism; the nut of the ball screw is connected to the actuator. A linear guide rail is arranged parallel to the ball screw above it, and both ends of the guide rail are fixed to two sets of support frames; the actuator is slidably connected to the actuator via a slider; The drive mechanism drives the transmission mechanism to operate, the transmission mechanism drives the ball screw to rotate, causing the nut to move horizontally along the screw and drive the actuator to move synchronously, while the actuator moves along the linear guide rail guided by the slider; The drive mechanism is electrically connected to the controller.

[0012] Optionally, the first cleaning device further includes: A first encoder is installed at the screw end of the ball screw to provide feedback on the rotational speed of the ball screw. The servo motor integrates a brake and a second encoder, used to control the injection angle of the nozzle assembly and store rotation angle information; The servo motor, the first encoder, and the drive mechanism are all connected to a controller. The controller adjusts the output power of the drive mechanism based on the rotational speed information fed back by the first encoder, controls the horizontal movement speed of the first nozzle assembly by adjusting the rotational speed of the ball screw, and controls the injection angle of the first nozzle assembly based on the rotational angle information fed back by the second encoder.

[0013] Optionally, in the controller, the pressure range of the high-pressure pump is preset to 10-35MPa, the cleaning angle range of the first nozzle structure and the second nozzle structure relative to the roller is 15-40°, and the rotational speed range of the ball screw is 0.5-3m / min.

[0014] A second aspect of this invention provides a cleaning method for the finishing machine of a hot-dip galvanizing unit, applied to the cleaning system for the finishing machine of a hot-dip galvanizing unit described in this application, comprising the following steps: Initial parameters are preset in the controller based on the steel coil material parameters; the initial parameters include initial pressure data, initial injection angle data, and initial velocity data. The controller drives the high-pressure pump and cleaning device to work according to the initial parameters. A strip steel surface inspection and analysis organization inspects and analyzes the surface quality of the strip steel on the exit side of the finished product, and obtains strip steel surface quality data; the strip steel surface quality data is the proportion of diagonal strip defects. The controller acquires and determines the proportion of the diagonal defects compared to a preset value. If the proportion of the diagonal defects is greater than the preset value, the high-pressure pump pressure is reduced by 10%-15%, and the nozzle structure movement speed is increased by 5%-10%. Simultaneously, the controller controls the nozzle structure to adjust the cleaning angle in the current cleaning mode. If the current cleaning mode is the forward spray mode, increase the cleaning angle by 2°-5°; If the current cleaning mode is reverse spray mode, reduce the cleaning angle by 2°-5°; The strip surface inspection and analysis mechanism continuously monitors the strip surface quality data. If the proportion of diagonal defects is still greater than the preset value, the adjustment is repeated in the same proportion until the strip surface quality data reaches the preset value multiple times. Alternatively, the adjustment is terminated when any of the following conditions are met: the pump pressure reaches the minimum allowable value, the nozzle structure spray angle reaches the maximum design angle, or the nozzle structure moving speed reaches the maximum allowable operating speed.

[0015] This invention discloses a cleaning system and method for a hot-dip galvanizing mill finishing machine, comprising: a working tank for storing cleaning water; a conveying structure, the inlet of which is connected to the outlet of the working tank, and a high-pressure pump mounted on the conveying structure; a cleaning device installed on the outlet side of the finishing mill for cleaning the mill rolls; the outlet of the conveying structure being connected to the inlet of the spray nozzle structure of the cleaning device; the cleaning of the rolls by the spray nozzle structure includes forward spraying and reverse spraying modes, where forward spraying refers to the spraying direction forming an acute angle with the tangent of any point on the roll surface during rotation, and reverse spraying refers to the spraying direction forming an obtuse angle with the tangent of any point on the roll surface during rotation; and a pressure gauge mounted on the conveying structure and located at the outlet of the mill. The outlet end of the high-pressure pump is used to detect the water pressure of the conveying structure and output water pressure data; the strip surface inspection and analysis mechanism is set on the outlet side of the finishing machine and is used to detect and analyze the surface quality of the strip at the outlet of the finishing machine to obtain strip surface quality data; the controller is connected to the high-pressure pump, the cleaning device, the pressure gauge and the strip surface inspection and analysis mechanism respectively, and the controller is used to adjust the pressure of the high-pressure pump and the cleaning angle and moving speed of the nozzle structure of the cleaning device relative to the roll according to the acquired strip surface quality data and water pressure data, so that the strip surface quality data reaches a preset value, and the strip surface quality data includes the proportion of diagonal area. This system stores cleaning water in a working tank, uses a conveyor structure to transport the water and provide power, and employs a cleaning device to specifically clean the rolls. Simultaneously, a pressure gauge monitors the water pressure in real time, and a strip surface inspection and analysis mechanism obtains quality data on the percentage of areas containing diagonal lines. Based on the water pressure and strip quality data, the controller collaboratively adjusts the pump pressure, nozzle angle, and movement speed, thereby achieving precise cleaning of the rolls on the finished mill. This not only effectively reduces surface defects in the strip and improves the strip quality pass rate, but also ensures stable operation of the cleaning system, reduces manual intervention costs, and provides reliable support for the efficient production of hot-dip galvanizing units. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a structural diagram of an optional hot-dip galvanizing unit cleaning system according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the overall structure of the first cleaning device, which is an option according to an embodiment of the present invention; Figure 3 This is a cross-sectional schematic diagram of the overall structure of the optional first cleaning device according to an embodiment of the present invention; Figure 4 yes Figure 3 Enlarged schematic diagram of the actuator; Figure 5 This is a schematic diagram of the optional gear pair and first nozzle assembly mounting structure according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the injection angle adjustment range of the optional first nozzle assembly according to an embodiment of the present invention; Figure 7 This is a schematic diagram of a forward spraying mode and a reverse spraying mode based on the working roller, which are optional according to embodiments of the present invention.

[0017] Reference numerals: 1. Working tank; 2. High-pressure pump; 3. Filter device; 4. Pressure gauge; 5. Cleaning device; 6. Support roller; 7. Working roller; 8. Heating device; 9. Circulating pump; 10. Support frame; 20. Horizontal guide mechanism; 21. Drive mechanism; 211. Motor frame; 212. Hydraulic motor; 22. Transmission mechanism; 221. First input gear; 222. First output gear; 223. First gearbox; 23. Ball screw; 24. Linear guide rail; 25. Slider; 30. Actuator; 31. Housing; 311. Second gearbox; 312. Protective cover; 32. Servo motor; 33. Gear pair; 331. Second input gear; 332. Second output gear; 40. First nozzle assembly; 41. Pipe clamp; 42. Nozzle; 50. First encoder; 60. Drain pipe. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] like Figure 1-7 As shown, the present invention provides a cleaning system and method for the finished hot-dip galvanizing unit, comprising: a working tank 1 for storing cleaning water; The conveying structure has an inlet connected to the outlet pipe of the working tank 1, and a high-pressure pump 2 is installed on the conveying structure. The cleaning device 5 is installed on the outlet side of the finishing machine and is used to clean the finishing machine rolls; the water outlet of the conveying structure is connected to the water inlet of the spray pipe structure of the cleaning device 5; the cleaning of the rolls by the spray pipe structure includes forward spraying mode and reverse spraying mode, forward spraying means that the spraying direction is at an acute angle to the tangent of any point on the roll surface when the roll rotates, and reverse spraying means that the included angle is an obtuse angle. Pressure gauge 4 is installed on the conveying structure and located at the outlet end of the high-pressure pump 2. It is used to detect the water pressure of the conveying structure and output water pressure data. The strip steel surface inspection and analysis mechanism is set on the exit side of the finishing machine to inspect and analyze the surface quality of the strip steel at the exit of the finishing machine and obtain strip steel surface quality data; The controller is connected to the high-pressure pump 2, the cleaning device 5, the pressure gauge 4, and the strip surface detection and analysis mechanism. The controller is used to adjust the pressure of the high-pressure pump 2 and the cleaning angle and moving speed of the nozzle structure of the cleaning device 5 relative to the rolls according to the acquired strip surface quality data and water pressure data, so that the strip surface quality data reaches a preset value. The strip surface quality data includes the proportion of diagonal area.

[0020] Specifically, the working tank 1 is dedicated to storing cleaning water for cleaning the rolls of the finishing machine. The stored cleaning water is softened water. Using softened water effectively prevents calcium and magnesium ions in the water from forming scale during the cleaning process, preventing scale from adhering to the roll surface or clogging the subsequent conveying structure and cleaning device 5, thus ensuring the stability of the cleaning effect and the reliability of the system operation. A drain pipe 60 is installed at the bottom of the working tank 1 to periodically remove impurities deposited inside. The conveying structure transports the cleaning water stored in the working tank 1 to the cleaning device 5, with its inlet connected to the outlet pipe of the working tank 1. The conveying structure is equipped with a high-pressure pump 2 and a circulating pump 9. The high-pressure pump 2, driven by a motor, primarily draws softened water from the working tank 1 and establishes pressure within the conveying structure to meet the cleaning requirements of the rolls, providing the core power for transporting the cleaning water to the cleaning device 5. The circulating pump 9 assists in regulating the water flow within the conveying structure. When it is necessary to reduce the water supply or stabilize the water pressure, the pump can adjust its speed or reverse its operation to return some of the water to the working tank 1, preventing a sudden increase in pressure within the conveying structure and ensuring that the water pressure delivered to the cleaning device 5 is stable and meets the cleaning requirements.

[0021] Cleaning device 5 is installed and fixed on the outlet side of the finishing mill to ensure that the roll surface is cleaned promptly after the rolls finish rolling the strip, preventing residual impurities from affecting the subsequent strip rolling quality. Cleaning device 5 is equipped with a spray nozzle structure. The outlet of the conveying structure is connected to the inlet of the spray nozzle structure, allowing high-pressure softened water from the conveying structure to be sprayed onto the roll surface through the spray nozzle structure, thus cleaning the rolls. Simultaneously, the cleaning angle and moving speed of the spray nozzle structure relative to the rolls are adjustable. The spray nozzle structure achieves roll surface cleaning through two cleaning modes: forward spraying and reverse spraying. Forward spraying refers to the spray direction forming an acute angle with the tangent of any point on the roll surface during rotation, with the water flow conforming to the roll surface's rotation direction, evenly washing away shallow impurities and reducing additional friction on the roll surface. Reverse spraying refers to the angle being obtuse, with the water flow impacting against the roll surface's rotation direction, resulting in a greater impact force on the roll surface. Figure 7 As shown, Figure 7Area A in the middle indicates forward spraying, and area B indicates reverse spraying. The cleaning angle refers to the angle between the spray direction and the plane containing the horizontal diameter of the roll. At the start of cleaning, the cleaning mode is preset, and the cleaning angle is adjusted within a fixed mode.

[0022] Pressure gauge 4 is used to monitor the water pressure in the conveying structure. It is installed on the conveying structure and located at the outlet of high-pressure pump 2. It can directly detect the water pressure at the outlet of high-pressure pump 2, thus reflecting the water pressure status of the entire conveying structure. Pressure gauge 4 monitors the water pressure in the conveying structure in real time and outputs the detected water pressure data to the controller. This provides the controller with real-time data to understand the current pressure status of the system, determine whether the pressure meets the requirements, and adjust the pressure of high-pressure pump 2 as needed. Pressure gauge 4 is a digital display pressure transmitter with a 4-20mA signal output, installed within 1m of the outlet of high-pressure pump 2.

[0023] The strip surface inspection and analysis mechanism is used to evaluate the surface quality of strip steel after rolling on a finishing mill. Located at the exit side of the finishing mill, it can complete surface quality inspection immediately after the strip leaves the mill, with an inspection speed matching the production line speed of 30-180 m / min. Internally, it integrates a high-speed camera and an image processing unit. The high-speed camera captures real-time images of the strip surface, while the image processing unit performs professional analysis and processing on the acquired images. Combined with a detection resolution of 0.1 mm², it can accurately identify minute defects on the strip surface, ultimately generating strip surface quality data including the proportion of diagonal strip area, and transmitting it to the controller in real time. The strip surface inspection and analysis mechanism is a machine vision inspection device, representing existing technology. Specifically, it first acquires the real-time running speed of the strip within the 30-180 m / min range through a speed sensor and converts it into an electrical signal, which is then transmitted to the control module. The control module combines the strip width and the 0.1 mm² detection resolution to determine the surface quality. 2 The system detects the resolution, calculates the required frame rate for the high-speed camera using a built-in algorithm, and adjusts it accordingly. The synchronization control module synchronizes the production line speed signal with the camera acquisition signal (triggering a shot every 0.1mm movement of the strip). The raw image captured by the camera is then transmitted to the image processing unit via a high-speed interface. The high-performance processor within the unit processes the data synchronously, ensuring that the processing speed is not lower than the acquisition speed, thus achieving matching with the production line speed.

[0024] In the process of detecting diagonal lines in strip steel, image acquisition is performed first. The synchronous control module in the strip steel surface inspection and analysis mechanism triggers a high-speed camera based on the strip steel's moving speed. A linear light source is used to eliminate interference, and the image resolution is matched to 0.1mm. 2Images of the strip surface are captured to ensure that details such as the fine lines and direction of the diagonal lines are clearly preserved. After capturing the images, a combination of Gaussian and median filtering is used to quickly remove noise, preventing noise from simulating the fine texture features of the diagonal lines. Then, the images are converted to grayscale, and grayscale equalization is used to control the grayscale difference of the strip surface to within 5. This parameter ensures that the grayscale difference between the diagonal lines and the normal area is ≥10, leaving sufficient space for subsequent identification. Finally, perspective transformation is used to correct image distortion, ensuring that the actual direction of the diagonal lines (at an angle of 30°-45° to the strip rolling direction) is without deviation in the image. If the distortion causes the angle deviation of the diagonal lines to exceed 5°, it will affect the defect judgment. Next, diagonal stripe defect identification is performed. First, the preprocessed image is compared pixel-by-pixel with a defect-free standard template. A grayscale difference threshold of 12 is set. Simultaneously, three or more consecutive areas with grayscale differences exceeding the threshold, arranged in the same direction and spaced ≤0.5mm apart, are marked as "suspected diagonal stripe areas" to eliminate isolated noise. Then, three core features are extracted from the suspected areas: length must be greater than or equal to 2mm (less than 2mm indicates a scratch); width must be between 0.1-0.3mm (more than 0.3mm indicates an indentation); and the angle between the direction of the strip and the rolling direction must be within the common diagonal stripe angle range of 15°-60°. The grayscale gradient changes in the area are also recorded, with grayscale gradient fluctuation ≤3 for diagonal stripe areas and ≥5 for normal areas. Finally, the extracted features are compared with the "diagonal stripe defect database." If the following three conditions are met: length, width, and angle feature matching degree ≥92%; grayscale gradient fluctuation difference ≤2; and number of continuous stripe segments ≥2 with a spacing ≤1mm between each segment, it is determined to be a diagonal stripe, and the diagonal stripe area is calculated (accurate to 0.1mm). 2 ) and proportion (total area of ​​twill stripes / area of ​​detection area). After the test is completed, the data is transmitted to the controller in real time via a high-speed interface, with a data delay of ≤0.5s.

[0025] The controller is connected via wiring to the high-pressure pump 2, cleaning device 5, pressure gauge 4, and strip surface inspection and analysis mechanism (strip surface inspection system), enabling centralized control and real-time data exchange for each component. Because the strip surface inspection and analysis mechanism can detect data at a speed of 0.1mm... 2 With high resolution and detection efficiency matching production line speeds of 30-180 m / min, the system generates accurate strip surface quality data, including the proportion of diagonal lines. The controller can then perform comprehensive analysis and judgment based on this data, combined with the water pressure data from the conveying structure transmitted by pressure gauge 4. When the analysis finds that the strip surface quality data does not meet the preset value, the controller will issue control commands: on the one hand, adjusting the pressure of high-pressure pump 2 to regulate the water pressure of the conveying structure by changing the operating state of high-pressure pump 2; on the other hand, adjusting the cleaning angle and moving speed to ensure that the cleaning parameters accurately address surface defects such as diagonal lines detected. Through the coordinated adjustment of high-precision detection data, the controller can more efficiently bring the strip surface quality data to the preset qualified standard, further ensuring the stability of strip rolling quality.

[0026] This application achieves precise cleaning of the rolls of the hot-dip galvanizing unit by setting up a working tank 1 to store cleaning water, a conveying structure to deliver water and provide power, a cleaning device 5 to clean the rolls in a targeted manner, a pressure gauge 4 to monitor water pressure in real time, and a strip surface detection and analysis mechanism to obtain quality data on the proportion of the area containing diagonal lines. Then, the controller adjusts the pump pressure, nozzle angle and moving speed in coordination based on the water pressure and strip quality data, thereby achieving precise cleaning of the rolls of the whole machine, effectively reducing strip surface defects, improving the strip quality pass rate, ensuring the stable operation of the cleaning system, reducing the cost of manual intervention, and providing reliable support for the efficient production of the hot-dip galvanizing unit.

[0027] In one possible implementation, the hot-dip galvanizing unit's finishing cleaning system further includes: Heating device 8, which is installed on the working tank 1, is used to heat the cleaning water in the working tank 1; The filter device 3 is disposed on the conveying structure and located between the outlet end of the high-pressure pump 2 and the inlet of the nozzle structure.

[0028] Specifically, the heating device 8 is installed on the working tank 1 and connected to the controller. Upon startup, it automatically heats the cleaning water in the working tank 1 to the set temperature under the control of the controller. Combined with the system's ability to adapt to ambient temperatures from -20℃ to 50℃, this ensures that the cleaning water temperature meets cleaning requirements in different seasons, preventing water quality deterioration or freezing in low-temperature environments from affecting cleaning. The filtration device 3 is installed on the conveying structure, located between the outlet of the high-pressure pump 2 and the inlet of the spray nozzle structure. It filters the cleaning water conveyed by the high-pressure pump 2, removing impurities and preventing them from clogging the spray nozzle structure or adhering to the roller surface, thus affecting the cleaning effect. In one possible implementation, the filtration device 3 is a multi-stage parallel structure, comprising at least one Y-type coarse filter and a precision filter cartridge.

[0029] Specifically, in the multi-stage parallel structure, multi-stage refers to first filtering out large particles such as rust and silt through at least one Y-type coarse filter, and then removing fine suspended solids and colloids through a precision cartridge filter (micron-level pore size), achieving purification from coarse to fine, ensuring that the clean water meets the standards, and avoiding clogging of nozzles or affecting the quality of the strip steel; parallel means that multiple sets of filter units work in parallel, which not only improves filtration efficiency, but also ensures that the other units can supply water normally when a single set is maintained, ensuring that the cleaning system does not run uninterrupted. In one possible implementation, the finishing mill roll includes two support rolls 6 and two work rolls 7 located between the two support rolls 6, the cleaning device 5 includes a first cleaning device 5 and a second cleaning device 5 arranged sequentially in a vertical direction, and the nozzle structure includes a first nozzle structure installed on the first cleaning device 5 and a second nozzle structure installed on the second cleaning device 5. The first nozzle structure includes two first nozzle assemblies 40, and the second nozzle structure includes two second nozzle assemblies; Wherein, the two first nozzle assemblies 40 are respectively opposite to one of the support rollers 6 and one of the working rollers 7, and the two second nozzle assemblies are respectively opposite to another support roller 6 and another working roller 7; The conveying structure includes a first conveying branch and a second conveying branch. The two outlets of the first conveying branch are respectively connected to the first nozzle assembly 40 and the second nozzle assembly opposite to the two support rollers 6. The two outlets of the second conveying branch are respectively connected to the first nozzle assembly and the second nozzle assembly opposite to the two work rollers 7.

[0030] Specifically, the finishing mill rolls include two support rolls 6 and two work rolls 7. The two support rolls 6 are located on the outer side, and the two work rolls 7 are sandwiched between the two support rolls 6. The main function of the support rolls 6 is to rigidly support the work rolls 7, preventing excessive deformation of the work rolls 7 due to rolling pressure and ensuring the rolling accuracy of the strip. The work rolls 7 are in direct contact with the strip, improving the surface smoothness and finish of the strip through rolling. The cleaning device 5 is designed in layers along the vertical direction, divided into a first cleaning device 5 and a second cleaning device 5. Corresponding to the roll layout, it is equipped with a first nozzle structure containing two first nozzle assemblies and a second nozzle structure containing two second nozzle assemblies. The two first nozzle assemblies 40 are respectively aligned with one support roll 6 and one adjacent work roll 7, and the two second nozzle assemblies are respectively aligned with another support roll 6 and another adjacent work roll 7, achieving one-to-one coverage of the four rolls. The conveying structure is divided into a first conveying branch and a second conveying branch. The two outlets of the first conveying branch are respectively connected to a first nozzle assembly and a second nozzle assembly of the support roller 6, which are dedicated to supplying water for cleaning the support roller 6. The two outlets of the second conveying branch are respectively connected to another first nozzle assembly 40 and another second nozzle assembly of the working roller 7, which are dedicated to supplying water for cleaning the working roller 7. The branch water supply design can flexibly adjust the water supply pressure and flow rate of the support roller 6 and the working roller 7 according to the difference in the degree of contamination, so as to ensure the cleaning effect and avoid water waste.

[0031] In one possible implementation, two high-pressure pumps 2 are installed in parallel on both the first and second conveying branches.

[0032] Specifically, two high-pressure pumps 2 are installed in parallel on both the first conveying branch for cleaning the support roller 6 and the second conveying branch for cleaning the work roller 7. When one pump is under maintenance, the other pump operates normally to avoid interruption of water supply to the branch and ensure continuous cleaning of the corresponding roller. There are also two circulating pumps 9 in parallel.

[0033] In one possible implementation, the first cleaning device 5 includes: Two sets of support frames 10 are set on the outlet side of the two sets of optical finishing machine frames and are located at the same horizontal position; A horizontal guide mechanism 20 is provided on the two sets of support frames 10; Actuator 30, wherein actuator 30 includes: The housing 31 is connected to the horizontal guide mechanism 20 and moves horizontally between the two sets of support frames 10 under the action of the horizontal guide mechanism 20. Servo motor 32, wherein the servo motor 32 is disposed inside the housing 31; Gear pair 33 is fixed inside the housing 31. The input end of gear pair 33 is connected to the output end of servo motor 32. The output end of gear pair 33 is connected to the two first nozzle assemblies 40 for adjusting the spray angle of the two first nozzle assemblies 40 relative to the corresponding working roller 7 and support roller 6. The two first nozzle assemblies 40 are connected to the conveying branch.

[0034] Specifically, the first cleaning device 5 and the second cleaning device 5 have the same structure. The exit side of the finishing mill stand is the end area where the strip is output after being rolled by the finishing mill, and the support frame 10 is a welded structural component. The two sets of support frames 10 are installed opposite each other on the exit side of the finishing mill stand, providing support and mounting foundation for the horizontal guide mechanism 20. The horizontal guide mechanism 20 is assembled on the two sets of support frames 10, providing horizontal movement guidance for the actuator 30, ensuring that the actuator 30 moves in a straight line between the two sets of support frames 10, and ensuring that the cleaning path is parallel to the rolls.

[0035] The actuator 30 includes a housing 31, a servo motor 32, and a gear pair 33. The housing 31 of the actuator 30 is connected to the horizontal guide mechanism 20, and horizontal movement along the support frame 10 is achieved through the constraint of the guide mechanism. The servo motor 32 and gear pair 33 are integrated inside, serving as the mounting carrier and power transmission hub for the first nozzle assembly 40, and carrying out the functions of cleaning action execution and angle adjustment. The servo motor 32 is set in the housing 31 of the actuator 30, and outputs rotational motion as a power source. By precisely controlling the start, stop, and speed, it drives the gear pair 33 to rotate.

[0036] The gear pair 33 is fixed inside the housing 31 of the actuator 30. Its input end is directly connected to the output end of the servo motor 32. Through gear meshing, the rotational power of the servo motor 32 is transmitted to the output end, controlling the angle adjustment of the two first nozzle assemblies 40 to achieve directional adjustment of the relative position of the nozzle and the roll. This optimizes the coverage of the cleaning jet. The first nozzle assembly 40 is connected to the output end of the gear pair 33, receiving the power transmitted by the gear pair 33 to adjust the spray angle. Simultaneously, it is connected to an external high-pressure water supply system, directionally spraying high-pressure water onto the roll surface. The impact force of the water flow removes residual zinc slag, oil, and other impurities from the roll surface, completing the online cleaning operation of the finished roll.

[0037] In one possible implementation, the horizontal guide mechanism includes: Drive mechanism 21, which is mounted on one of the support frames 10; The transmission mechanism 22 has its input end fixedly connected to the output shaft of the drive mechanism 21; A ball screw 23 is horizontally arranged between two support frames 10. The two ends of the screw of the ball screw 23 are rotatably passed through the two sets of support frames 10, and one end of the screw is connected to the output end of the transmission mechanism 22. The nut of the ball screw 23 is connected to the actuator 30. A linear guide 24 is arranged parallel above the ball screw 23, and both ends of the linear guide 24 are fixed on the two sets of support frames 10; the actuator is slidably connected to the actuator 30 through a slider 25; The drive mechanism 21 drives the transmission mechanism 22 to operate, and the transmission mechanism 22 drives the ball screw 23 to rotate, so that the nut moves horizontally along the screw and drives the actuator 30 to move synchronously. At the same time, the actuator 30 moves along the linear guide rail 24 guided by the slider 25. The drive mechanism 21 is electrically connected to the controller.

[0038] Specifically, the drive mechanism 21 is mounted on a single support frame 10, providing a power source for the horizontal guide mechanism 20. The rotation of the output shaft of the drive mechanism 21 drives the transmission mechanism 22, providing initial power input for subsequent transmission processes. The input end of the transmission mechanism 22 is fixedly connected to the output shaft of the drive mechanism 21, serving as an intermediate link in power transmission. After receiving the rotational power output by the drive mechanism 21, this mechanism adjusts the power parameters through its internal transmission structure, transmitting the appropriate rotational power to the ball screw 23 to ensure that the ball screw 23 receives the required driving force.

[0039] A ball screw 23 is horizontally positioned between two support frames 10, with both ends of the screw rotatably mounted on the support frames 10 via bearings. One end of the screw is connected to the output end of the transmission mechanism 22. When the transmission mechanism 22 drives the screw to rotate, the balls roll between the screw and the nut's helical raceway, converting the rotational motion into linear motion of the nut along the screw axis, thereby driving the actuator 30 connected to the nut to move horizontally. The ball screw 23 is prior art, and its specific structure will not be described in detail here.

[0040] The linear guide rail 24 is mounted parallel to the ball screw 23 and fixed at both ends to two sets of support frames 10. It provides linear movement guidance for the actuator 30 and also connects to the actuator 30 via the slider 25 to bear part of its weight. When the actuator 30 slides along the linear guide rail 24 via the slider 25, the guide rail restricts the actuator 30 to move only along a fixed straight line, while simultaneously sharing the weight of the actuator 30.

[0041] The drive mechanism 21 consists of a motor frame 211 and a hydraulic motor 212 mounted on the motor frame 211. The output shaft of the hydraulic motor 212 is fixed to the input end of the transmission mechanism 22 via a key connection. The hydraulic motor 212 directly drives the transmission mechanism 22 through its output shaft, providing stable and high-torque initial power to the ball screw 23. The high-torque characteristics of the hydraulic motor 212 can easily drive the ball screw 23 and the actuator 30, adapting to load changes during the cleaning process. The fixed structure of the motor frame 211 enhances overall rigidity, reduces vibration and offset, and ensures the stability of power transmission. The hydraulic drive method is responsive and easy to adjust, meeting the power requirements under different cleaning conditions. It is also compact, highly reliable, and suitable for continuous operation of the entire machine.

[0042] The hydraulic motor 212 is electrically connected to the controller, enabling the controller to adjust the output power and speed of the hydraulic motor 212 in real time based on the quality data fed back by the strip surface detection and analysis mechanism and the system operating status. When it is necessary to adjust the moving speed of the actuator 30 to match the rolling mill cleaning rhythm, the controller can change the operating parameters of the hydraulic motor 212 through an electrical signal, and indirectly adjust the rotation speed of the ball screw 23 through the transmission mechanism 22, thereby precisely controlling the horizontal moving speed of the actuator 30.

[0043] The first output gear 222 is fixed to one end of the ball screw 23 via a key connection. When the first input gear 221 rotates, it becomes the input end of the transmission mechanism 22. When the hydraulic motor 212 drives the first input gear 221 to rotate, the power is transmitted to the first output gear 222 through gear meshing, thereby driving the ball screw 23 to rotate synchronously. The gear meshing transmission has a stable transmission ratio, which can accurately control the rotational speed of the ball screw 23 and ensure that the horizontal movement speed of the actuator 30 is uniform. The key connection structure ensures that there is no relative slippage during power transmission, improving the reliability of the transmission. The gear transmission converts the high torque of the hydraulic motor 212 into a rotational driving force suitable for the ball screw 23, resulting in high transmission efficiency and a compact structure.

[0044] Two first output gears 222 are horizontally symmetrically arranged on both sides of the first input gear 221. Each first output gear 222 drives a set of ball screws 23 separately through a key connection. The two sets of ball screws 23 are symmetrically installed on both sides of the actuator 30, and both sets of ball screws 23 are matched with the linear guides 24 arranged parallel to both sides of the actuator 30. Each set of ball screws 23 is equipped with a corresponding linear guide 24. The two ends of the guides are fixed on the support frame 10. The two sides of the actuator 30 are slidably connected to the linear guides 24 on the same side through sliders 25.

[0045] Two sets of symmetrically arranged ball screws 23 and linear guides 24 distribute the power output from a single hydraulic motor 212 to two first output gears 222 via a first input gear 221. These gears synchronously drive the ball screws 23 on both sides to rotate, causing the nuts on both sides of the actuator 30 to synchronously move the housing 31 in translation. The linear guides 24 on both sides provide precise guidance for the actuator 30, working in conjunction with the ball screws 23 to constrain the movement path, ensuring that the actuator 30 moves smoothly in a direction parallel to the roll. Simultaneously, the symmetrical force-bearing structure disperses the weight of the actuator 30 and the cleaning reaction force. The two first output gears 222 have the same number of teeth and module, ensuring that they can synchronously drive the corresponding ball screws 23 at the same speed, allowing the actuator 30 to move synchronously on both sides, guaranteeing the smoothness and straightness of horizontal movement.

[0046] The first gearbox 223 is fixedly connected to the motor frame 211 and the support frame 10 respectively. The first input gear 221 and the two first output gears 222 are set in the first gearbox 223, which can provide a closed protective space for gear transmission, effectively preventing impurities such as water mist and oxide scale in the cleaning environment from entering the gear meshing parts, and preventing the gears from wearing out or jamming due to contamination. The gearbox can also maintain the stability of the internal lubricating oil film, reducing friction loss and noise during gear transmission.

[0047] The housing 31 includes a second gearbox 311 and a protective cover 312. The second gearbox 311 provides a closed installation space for the gear pair 33, effectively protecting the gear meshing parts from water mist, oxide scale and other impurities in the cleaning environment, ensuring gear transmission accuracy and service life; the protective cover 312 isolates the servo motor 32 from the external environment, preventing liquid splashes and dust intrusion, and ensuring stable operation of the motor.

[0048] The gear pair 33 includes a second input gear 331 and two second output gears 332. The gear shaft of the second input gear 331 is fixedly connected to the output shaft of the servo motor 32 via a key. The two second output gears 332 are symmetrically arranged on the upper and lower sides of the second input gear 331 and mesh with it. The gear shafts of the second input gear 331 and the two second output gears 332 are all rotatably fixed to the second gearbox 311 via bearings, and the gear shafts are all parallel to the axis of the roll. The servo motor 32 directly transmits power to the second input gear 331 via a key connection, which drives the two second output gears 332 to rotate through gear meshing. Since the two second output gears 332 are symmetrically distributed on the upper and lower sides of the second input gear 331 and mesh with it, when the second input gear 331 rotates, it will drive the two second output gears 332 to rotate in the same direction (for example, when the second input gear 331 rotates clockwise, the upper second output gear 332 and the lower second output gear 332 both rotate counterclockwise; when the second input gear 331 rotates counterclockwise, the upper second output gear 332 and the lower second output gear 332 both rotate clockwise); the gear shaft of each second output gear 332 is fixedly connected to the pipe clamp of the corresponding nozzle 40. The pipe clamp uses a fixed point as a fulcrum, causing the nozzle 40 to swing synchronously with the rotation of the gear shaft. When the second output gear 332 rotates clockwise, the nozzle 40 rotates clockwise by a certain angle. When the second output gear 332 rotates counterclockwise, the nozzle 40 rotates counterclockwise by a certain angle. The total range of clockwise and counterclockwise rotation of the nozzle 40 constitutes its spray angle adjustment range. The rotation direction and angle of the second input gear 331 are precisely controlled by the servo motor 33, thereby driving the second output gear 332 and the nozzle 40 to achieve precise angle adjustment, thus adjusting the spray angle of the nozzle on the surface of the roll.

[0049] When the two first nozzle assemblies 40 need to achieve the same rotation angle (for example, the nozzles 42 on both sides are symmetrically adjusted and the length of the nozzles 42 and the corresponding roller diameter are the same), the number of teeth and the module of the two second output gears 332 are the same, ensuring that the gear transmission ratio is consistent when the servo motor 32 drives the first nozzle assemblies 40 on both sides to deflect synchronously and with the same amplitude.

[0050] When the two first nozzle assemblies 40 need to achieve different rotation angles (for example, the lengths of the nozzles 42 on both sides are different, or the diameters of the corresponding rollers are significantly different, requiring differentiated adjustment of the spray angle), the number of teeth or the module of the two second output gears 332 are different. By changing the gear transmission ratio, the two second output gears 332 on both sides generate different angular velocities under the same input speed, thereby precisely adjusting the deflection angle of the corresponding first nozzle assembly 40 to adapt to the cleaning needs of different positions.

[0051] The first nozzle assembly 40 includes two sets of pipe clamps 41 and two sets of nozzles 42. The first end of each set of pipe clamps 41 is fixedly sleeved on the gear shaft of a second output gear 332 extending out of the second gearbox 311. Each set of nozzles 42 includes a nozzle and a conveying pipe. The nozzle is opposite to the roller surface of the roll. The port of the conveying pipe is connected to an external high-pressure water supply system. The body of the conveying pipe is inserted and fixed in the through hole at the second end of the pipe clamp 41. Each set of nozzles 42 corresponds to one roll. When the second output gear 332 rotates, it drives the corresponding pipe clamp 41 to swing around its gear shaft axis. The swing of the pipe clamp 41 causes the nozzle 42 to rotate around the fixed point of the pipe clamp 41, thereby adjusting the relative angle between the nozzle and the roller surface of the corresponding roll. The rotation of the second output gear 332 drives the pipe clamp 41 to swing, achieving precise adjustment of the nozzle 42 angle. The fixed connection between the pipe clamp 41 and the gear shaft, and the fixed insertion of the nozzle 42 through the through hole of the pipe clamp 41, ensure the stability and structural rigidity of the nozzle 42 during angle adjustment. Each roll has an independently set nozzle 42 and pipe clamp 41, adaptable to differences in roll diameter, nozzle 42 length, etc., achieving differentiated angle adjustment, improving cleaning coverage and effect, while maintaining a compact structure for easy maintenance and adjustment. The spray angle adjustment range is 15° to 40°. The cleaning of the roll surface by the nozzle includes forward spraying and reverse spraying. Forward spraying is when the angle between the nozzle spray direction and the tangent at any point on the roll surface during rotation is acute, while reverse spraying is when this angle is obtuse.

[0052] In one possible implementation, the first cleaning device further includes: The first encoder 50 is installed at the screw end of the ball screw 23 and is used to provide feedback on the rotational speed of the ball screw 23. The servo motor 32 integrates a brake and a second encoder, which are used to control the injection angle of the first nozzle assembly 40 and store rotation angle information. The servo motor 32, the first encoder 50, and the drive mechanism 21 are all connected to a controller. The controller adjusts the output power of the drive mechanism based on the rotational speed information fed back by the first encoder 50, controls the horizontal movement speed of the first nozzle assembly 40 by adjusting the rotational speed of the ball screw, and controls the injection angle of the first nozzle assembly 40 based on the rotational angle information fed back by the second encoder.

[0053] Specifically, the whole-machine cleaning device 5 is equipped with a first encoder 50 installed at the end of the ball screw 23. The first encoder 50 feeds back the rotational speed signal of the ball screw 23 to the controller. The controller calculates the moving speed of the actuator 30 by combining the real-time monitored rotational speed information with the pitch parameter of the ball screw 23. Different cleaning effects can be achieved by varying the moving speed of the actuator 30 and the corresponding nozzle angle. The servo motor 32 integrates a brake and a second encoder. The second encoder is an absolute encoder, which can precisely control the spray angle of the first nozzle assembly 40 and store the rotation angle information. The brake is a built-in braking device of the servo motor 32, used to lock the motor shaft to prevent accidental deviation when the machine stops. The second encoder is a sensor that monitors the motor rotation angle in real time and stores the position information, used to precisely control the nozzle spray angle and ensure angle memory after power failure. The servo motor 32 integrating the brake and the second encoder is existing technology and will not be described in detail here. The controller is communicatively connected to the servo motor 32, the first encoder 50, and the hydraulic motor 212. Based on the speed information fed back by the first encoder 50, it adjusts the output power of the hydraulic motor 212, thereby regulating the speed of the ball screw 23 to control the horizontal movement speed of the first nozzle assembly 40. Simultaneously, it precisely controls the spray angle of the nozzle assembly 40 through the rotation angle information fed back by the second encoder. The closed-loop feedback mechanism adjusts the power of the hydraulic motor 212 in real time to ensure the stable speed of the ball screw 23, ensuring the uniform horizontal movement speed of the actuator 30 and improving the consistency of the cleaning process. The second encoder integrated in the servo motor 32 accurately records the rotation angle and has a power-off position holding function to prevent the loss of angle information after abnormal power failure, ensuring the accuracy of the angle adjustment and repeatability of the first nozzle assembly 40. The controller integrates multi-sensor data to dynamically coordinate the horizontal movement speed and angle adjustment, achieving precise matching between the cleaning path and the spray direction. At the same time, the brake function can lock the angle of the nozzle 42 when the machine stops to avoid accidental deviation, enhancing the reliability, safety, and intelligence of the system operation, and adapting to the high-precision cleaning requirements in continuous production.

[0054] In one possible implementation, the controller presets the pressure range of the high-pressure pump 2 to 10-35 MPa, the cleaning angle range of the first nozzle structure and the second nozzle structure relative to the roll to 15-40°, and the rotational speed range of the ball screw to 0.5-3 m / min.

[0055] Specifically, the pressure range of the high-pressure pump 2 is set to 10-35MPa, which avoids incomplete cleaning due to low pressure and damage to the equipment due to high pressure; the cleaning angle of the nozzle is 15-40°, which can take into account both cleaning of the roller surface grooves and overall coverage, preventing water flow rebound or leaving blind spots; the ball screw speed is 0.5-3m / min, which can match the production line speed and cleaning requirements, and avoid improper speed affecting the cleaning effect or the stability of the mechanism. By presetting these parameter ranges, firstly, the control boundaries are clearly defined to prevent parameters from exceeding the equipment's tolerance limits and ensure system safety; secondly, different operating conditions are covered, allowing for rapid response to situations such as roll contamination and changes in production line speed without the need to reset thresholds.

[0056] This application also provides a cleaning method for the finishing machine of a hot-dip galvanizing unit, applied to the cleaning system for the finishing machine of the hot-dip galvanizing unit described in this application, including the following steps: S1. Preset initial parameters in the controller according to the steel coil material parameters; the initial parameters include initial pressure data, initial cleaning mode, initial spray angle data and initial speed data; S2. The controller drives the high-pressure pump 2 and the cleaning device 5 to work according to the initial parameters. S3. The strip steel surface inspection and analysis organization inspects and analyzes the surface quality of the strip steel on the exit side of the finished machine, and obtains strip steel surface quality data; the strip steel surface quality data is the proportion of diagonal strip defects. S4. The controller acquires and determines the proportion of the diagonal defects compared to a preset value. If the proportion of the diagonal defects is greater than the preset value, the pressure of the high-pressure pump 2 is reduced by 10%-15%, and the moving speed of the nozzle structure is increased by 5%-10%. Simultaneously, the controller controls the nozzle structure to adjust the cleaning angle in the current cleaning mode. If the current cleaning mode is the forward spray mode, increase the cleaning angle by 2°-5°; If the current cleaning mode is reverse spray mode, reduce the cleaning angle by 2°-5°; S5. The strip steel surface inspection and analysis mechanism continuously detects the strip steel surface quality data. If the proportion of diagonal defects is still greater than the preset value, the adjustment is repeated in the same proportion until the strip steel surface quality data reaches the preset value multiple times. Or, when any of the following conditions are met, the adjustment process is terminated: the pump pressure reaches the minimum allowable value, the nozzle structure spray angle reaches the maximum design angle, or the nozzle structure moving speed reaches the maximum allowable operating speed.

[0057] Specifically, S1 first acquires the material parameters of the steel coil to be rolled, including information such as steel grade, composition, and hardness. Then, through the controller's operating interface, the initial data adapted to this material is entered into the system. The initial pressure data needs to be set according to the material characteristics. For example, a starting pressure of around 15MPa can be set for low-carbon steel, and around 20MPa for alloy steel. The initial injection angle data is adjusted according to the roll diameter, usually set to around 25°. The initial speed data refers to the production line's base speed, set to around 1m / min as the starting speed. After entry, the data is saved through the controller to ensure that the initial parameters are recognized by the system and used as the benchmark for subsequent operations. S2. The controller first retrieves the initial data saved in S1, and sends an electrical signal to the high-pressure pump 2 through the line to control the motor of the high-pressure pump 2 to start and operate according to the initial pressure data, so that the cleaning water in the working tank 1 is drawn through the conveying branch and flows to the nozzle structure at the set pressure; at the same time, the controller sends a signal to the angle adjustment motor of the cleaning device 5 to drive the adjustment component of the nozzle structure to rotate and adjust the nozzle angle to the initial spray angle; in addition, the controller sends a signal to the drive motor of the ball screw to drive the ball screw to rotate according to the initial speed data, and then drive the nozzle structure to move along the linear guide rail at the set speed. At this time, the nozzle structure begins to spray cleaning water onto the roll and enters the initial cleaning state. S3. The speed sensor of the strip surface inspection and analysis mechanism first captures the moving speed of the strip and transmits the signal to its own control module. The frame rate of the high-speed camera is adjusted to match the speed of the strip, ensuring that the captured images of the strip surface are clear and unblurred. The camera continuously captures images of the strip surface and transmits them to its own image processing unit via a high-speed interface. The image processing unit identifies the diagonal stripe areas in the image using a preset algorithm and calculates the ratio of the total area of ​​the diagonal stripe areas to the total area of ​​the strip inspection area to obtain the proportion of diagonal stripe defects. Subsequently, the image processing unit converts the diagonal stripe defect proportion data into an electrical signal and transmits it to the controller in real time via a line. The controller's display screen simultaneously displays this data for the operator to view. In step S4, the controller first compares the obtained percentage of diagonal defects with the preset value. If the percentage of diagonal defects exceeds the preset value, it indicates that the current cleaning water flow is impacting the rolls too strongly, resulting in excessive diagonal marks on the strip surface. Adjustments are then made: First, the pressure of high-pressure pump 2 is reduced by 10%-15% to weaken the impact of the water flow on the rolls at the source by reducing the total output energy of the cleaning water flow. Second, the moving speed of the nozzle structure is increased by 5%-10% to shorten the continuous impact time of the water flow in the same area of ​​the rolls, avoiding excessive accumulation of local impact energy. Third, the controller adjusts the nozzle's cleaning mode accordingly. Adjust the cleaning angle (the angle between the nozzle spray direction and the horizontal diameter of the roll). If the current mode is forward spray (the impact force itself is relatively small, and the diagonal lines are mostly due to concentrated local impact), increase the cleaning angle by 2°-5°. By optimizing the angle between the water flow and the horizontal direction of the roll, the water flow can cover the roll surface more evenly and disperse local impact. If the current mode is reverse spray (the impact force is relatively large, and the diagonal lines are mostly due to excessive reverse impact), decrease the cleaning angle by 2°-5°. By adjusting the water flow angle, reduce the degree of reversal between the water flow and the tangential direction of the roll rotation, reduce the reverse impact component force, weaken the roll impact, and thus reduce the diagonal line defects in the strip. In this process, the controller determines whether the nozzle structure is in forward or reverse spray mode. Taking the first cleaning device 5 as an example, the first nozzle assembly 40 is mounted on the second output gear 332. An angle encoder is installed on the gear shaft end of the second output gear 332. The controller pre-sets the gear rotation angle ranges corresponding to forward and reverse spray (e.g., forward spray corresponds to 0°-90°, and reverse spray corresponds to 90°-180°). When the second output gear 332 drives the first nozzle assembly to deflect, the angle encoder transmits the actual angle data of the second output gear 332 to the controller in real time. The controller compares the received angle data with the preset range. If it is within 0°-90°, it is determined to be in forward spray mode; if it is within 90°-180°, it is determined to be in reverse spray mode, thus identifying the current working mode. In this application, the preset value for the proportion of diagonal defects is 2%. In other embodiments, other specific values ​​can be set according to actual needs.

[0058] S5. The time interval for the strip surface inspection and analysis mechanism is set according to the production line speed: 10 seconds for speeds of 30-60 m / min, 5 seconds for 60-120 m / min, and 3 seconds for 120-180 m / min. After receiving the data, if the diagonal lines exceed the limit, the controller will issue an adjustment command within 500 ms to adjust the parameters. The pressure adjustment accuracy is ±0.5 MPa, the angle adjustment accuracy is ±1°, and the speed adjustment accuracy is ±0.1 m / min. If the data is still greater than the preset value, the controller will repeat the adjustment action of S4. Each adjustment will reduce the pump pressure, increase the spray angle, and increase the trolley speed by the same proportion. During the adjustment process, the controller will monitor the current pressure value fed back by the pressure sensor of the high-pressure pump 2, the current angle value fed back by the angle sensor of the cleaning device 5, and the current speed value fed back by the ball screw speed sensor in real time. When the proportion of diagonal line defects detected three times in a row reaches the preset value, or any key parameter reaches the corresponding limit value, the controller will immediately send a stop adjustment signal, while maintaining the current parameters stable and terminating the adjustment process.

[0059] In addition, the controller continuously collects the pressure parameters of the high-pressure pump 2, the angle parameters of the nozzle assembly, and the speed parameters of the actuator. To ensure the timeliness and accuracy of parameter capture, its sampling frequency is no less than 100Hz. At the same time, the controller compares the collected parameters with its preset corresponding standard values ​​in real time. If the actual value of any parameter deviates from the preset standard value by more than 5%, an alarm mechanism will be triggered immediately so that operators can promptly detect parameter abnormalities (such as sudden pressure changes, angle deviations, unstable speeds, etc.) and avoid abnormal parameters affecting the roll cleaning effect or causing equipment operation risks.

[0060] It should be noted that in the controller program design of this application, in the speed adjustment stage of the hot-dip galvanizing unit's finishing cleaning system, the system simultaneously addresses the needs of cleaning impurities from the rolls and improving strip diagonal defects, with a priority given to resolving diagonal defects. During adjustment, the controller first prioritizes receiving diagonal percentage data. If the diagonal exceeds the standard, the speed is reduced by 0.1-0.3 m / min, and the nozzle angle is simultaneously fine-tuned by ±2°. If the standard is met, the speed is maintained or increased by ≤0.3 m / min. Then, according to the second priority, the speed boundary is limited based on the impurity percentage (impurity percentage ≥3% not lower than 0.8 m / min, 1%-3% maintained at 1.5-2 m / min, ≤1% not higher than 3 m / min) to ensure that the basic cleaning requirements are not exceeded. Finally, according to the third priority, with a 72-hour cycle, if the diagonal exceeds the standard ≥5 times after adjustment in a certain impurity range, the speed boundary of that range is automatically fine-tuned by ±0.1 m / min (single ≤0.1 m / min, cumulative ≤10% of the original boundary) to reduce the repetitiveness of subsequent adjustments.

[0061] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A cleaning system for the finished product of a hot-dip galvanizing unit, characterized in that, include: Working tank, used to store cleaning water; A conveying structure, wherein the inlet of the conveying structure is connected to the outlet pipe of the working tank, and a high-pressure pump is installed on the conveying structure; A cleaning device is installed on the outlet side of the finishing mill and is used to clean the mill rolls. The outlet of the conveying structure is connected to the inlet of the spray pipe structure of the cleaning device. The cleaning of the rolls by the spray pipe structure includes forward spraying and reverse spraying. Forward spraying means that the spraying direction is at an acute angle to the tangent of any point on the roll surface when the roll rotates, and reverse spraying means that the spraying direction is at an obtuse angle to the tangent of any point on the roll surface when the roll rotates. A pressure gauge is installed on the conveying structure and located at the outlet end of the high-pressure pump to detect the water pressure of the conveying structure and output water pressure data. The strip steel surface inspection and analysis mechanism is set on the exit side of the finishing machine to inspect and analyze the surface quality of the strip steel at the exit of the finishing machine and obtain strip steel surface quality data; The controller is connected to the high-pressure pump, the cleaning device, the pressure gauge, and the strip surface detection and analysis mechanism. The controller is used to adjust the pressure of the high-pressure pump and the cleaning angle and moving speed of the nozzle structure of the cleaning device relative to the rolls according to the acquired strip surface quality data and water pressure data, so that the strip surface quality data reaches a preset value. The strip surface quality data includes the proportion of diagonal area.

2. The hot-dip galvanizing unit finishing cleaning system according to claim 1, characterized in that, The hot-dip galvanizing unit's finishing machine cleaning system also includes: A heating device is installed on the working tank for heating the cleaning water in the working tank; A filtration device is disposed on the conveying structure and located between the outlet end of the high-pressure pump and the inlet of the nozzle structure.

3. The hot-dip galvanizing unit finishing cleaning system according to claim 2, characterized in that, The filtration device is a multi-stage parallel structure, comprising at least one Y-type coarse filter and a precision filter cartridge.

4. A cleaning system for a hot-dip galvanizing unit's finishing mill according to claim 1, wherein the finishing mill rolls include two support rolls and two work rolls located between the two support rolls, characterized in that, The cleaning device includes a first cleaning device and a second cleaning device arranged sequentially in a vertical direction, and the nozzle structure includes a first nozzle structure installed in the first cleaning device and a second nozzle structure installed in the second cleaning device. The first nozzle structure includes two first nozzle assemblies, and the second nozzle structure includes two second nozzle assemblies; Wherein, the two first nozzle assemblies are respectively opposite to one of the support rollers and one of the work rollers, and the two second nozzle assemblies are respectively opposite to another support roller and another work roller; The conveying structure includes a first conveying branch and a second conveying branch. The two outlets of the first conveying branch are respectively connected to the first nozzle assembly and the second nozzle assembly opposite to the two support rollers. The two outlets of the second conveying branch are respectively connected to the first nozzle assembly and the second nozzle assembly opposite to the two working rollers.

5. The hot-dip galvanizing unit finishing cleaning system according to claim 4, characterized in that, Two high-pressure pumps are installed in parallel on both the first and second conveying branches.

6. The hot-dip galvanizing unit finishing cleaning system according to claim 4, characterized in that, The first cleaning device includes: Two sets of support frames are installed on the exit side of the two sets of optical finishing machine frames and are located at the same horizontal position; A horizontal guiding mechanism is mounted on the two sets of support frames; The executing mechanism includes: The housing is connected to the horizontal guide mechanism and moves horizontally between the two sets of support frames under the action of the horizontal guide mechanism. A servo motor, wherein the servo motor is disposed within the housing; A gear pair is fixed inside the housing. The input end of the gear pair is connected to the output end of the servo motor, and the output end of the gear pair is connected to the two first nozzle assemblies for adjusting the spray angle of the two first nozzle assemblies relative to the corresponding working roller and the support roller, respectively. The two first nozzle assemblies are connected to the conveying branch.

7. The hot-dip galvanizing unit finishing cleaning system according to claim 6, characterized in that, The horizontal guiding mechanism includes: A drive mechanism, which is mounted on one of the support frames; A transmission mechanism, wherein the input end of the transmission mechanism is fixedly connected to the output shaft of the drive mechanism; A ball screw is horizontally disposed between two support frames, with both ends of the screw rotatably passing through the two sets of support frames, and one end of the screw being connected to the output end of the transmission mechanism; the nut of the ball screw is connected to the actuator. A linear guide rail is arranged parallel to the ball screw above it, and both ends of the guide rail are fixed to two sets of support frames; the actuator is slidably connected to the actuator via a slider; The drive mechanism drives the transmission mechanism to operate, the transmission mechanism drives the ball screw to rotate, causing the nut to move horizontally along the screw and drive the actuator to move synchronously, while the actuator moves along the linear guide rail guided by the slider; The drive mechanism is electrically connected to the controller.

8. The hot-dip galvanizing unit finishing cleaning system according to claim 7, characterized in that, The first cleaning device further includes: A first encoder is installed at the screw end of the ball screw to provide feedback on the rotational speed of the ball screw. The servo motor integrates a brake and a second encoder, used to control the injection angle of the nozzle assembly and store rotation angle information; The servo motor, the first encoder, and the drive mechanism are all connected to a controller. The controller adjusts the output power of the drive mechanism based on the rotational speed information fed back by the first encoder, controls the horizontal movement speed of the first nozzle assembly by adjusting the rotational speed of the ball screw, and controls the injection angle of the first nozzle assembly based on the rotational angle information fed back by the second encoder.

9. The hot-dip galvanizing unit finishing cleaning system according to claim 8, characterized in that, In the controller, the pressure range of the high-pressure pump is preset to 10-35MPa, the cleaning angle range of the first nozzle structure and the second nozzle structure relative to the roller is 15-40°, and the rotational speed range of the ball screw is 0.5-3m / min.

10. A method for cleaning a hot-dip galvanizing unit's finished surface, applied to the cleaning system for a hot-dip galvanizing unit's finished surface as described in any one of claims 1-9, characterized in that, Includes the following steps: Initial parameters are preset in the controller based on the steel coil material parameters; the initial parameters include initial pressure data, initial injection angle data, and initial velocity data. The controller drives the high-pressure pump and cleaning device to work according to the initial parameters. A strip steel surface inspection and analysis organization inspects and analyzes the surface quality of the strip steel on the exit side of the finished product, and obtains strip steel surface quality data; the strip steel surface quality data is the proportion of diagonal strip defects. The controller acquires and determines the proportion of the diagonal defects compared to a preset value. If the proportion of the diagonal defects is greater than the preset value, the high-pressure pump pressure is reduced by 10%-15%, and the nozzle structure movement speed is increased by 5%-10%. Simultaneously, the controller controls the nozzle structure to adjust the cleaning angle in the current cleaning mode. If the current cleaning mode is the forward spray mode, increase the cleaning angle by 2°-5°; If the current cleaning mode is reverse spray mode, reduce the cleaning angle by 2°-5°; The strip surface inspection and analysis mechanism continuously monitors the strip surface quality data. If the proportion of diagonal defects is still greater than the preset value, the adjustment is repeated in the same proportion until the strip surface quality data reaches the preset value multiple times. Alternatively, the adjustment is terminated when any of the following conditions are met: the pump pressure reaches the minimum allowable value, the nozzle structure spray angle reaches the maximum design angle, or the nozzle structure moving speed reaches the maximum allowable operating speed.

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