CN109894315B - Roller coating control method for reducing damage of roller surface of coating roller - Google Patents
Roller coating control method for reducing damage of roller surface of coating roller Download PDFInfo
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- CN109894315B CN109894315B CN201711310694.9A CN201711310694A CN109894315B CN 109894315 B CN109894315 B CN 109894315B CN 201711310694 A CN201711310694 A CN 201711310694A CN 109894315 B CN109894315 B CN 109894315B
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Abstract
The invention relates to a roller coating control method for reducing damage of a roller surface of a coating roller, which comprises the following steps: 1) a liquid taking roller position zero calibration control flow, a coating roller position zero calibration control flow, a liquid taking roller and backing roller control flow, a coating roller and backing roller control flow, a 4) a coating roller and backing roller control flow, and a 5) a roll coater overwelding seam control flow. According to the technical scheme, the adverse effects of roll surface abrasion on an automatic control process are eliminated by adding automatic position zero calibration and pressure zero calibration models of a liquid taking roll and a coating roll in a roll coating backup roll process, and the pressure control precision of a roll coater is improved; by adopting the width and thickness data of the strip steel in real time, the control model of the coating roller when the roller coating backup roller and the strip steel weld pass is optimized to reduce the partial scratch of the strip steel at the weld on the surface of the coating roller and reduce the surface deformation and cracking caused by the steep increase of the pressure of the coating roller due to the increase of the thickness of the strip steel.
Description
Technical Field
The invention relates to a roller coating control method for reducing damage of a roller surface of a coating roller, and belongs to the technical field of roller coating control.
Background
In order to meet the corrosion resistance requirements of household appliances, industrial equipment and the like on the surface of a steel plate, provide good surface coating property, humidity resistance and fingerprint resistance for household appliances and automobile plate products, and prevent white rust and other defects in the transportation and processing process, a roll coater is generally used for coating a specified chemical coating on the surface of a strip steel in the product post-treatment process of a cold-rolling hot-dip aluminum zinc production line. Referring to fig. 1, a roll coater is generally of a four-roll vertical structure and mainly comprises an upper coating roll, an upper liquid taking roll, a lower coating roll, a frame, a roll driving motor, a pressure regulating servo motor and the like, wherein the liquid taking roll is subjected to chrome plating treatment on the surface of a steel roll, and the coating roll is subjected to polyurethane rubber treatment on the surface layer of the steel roll. The strip steel passes through the space between the upper coating roller and the lower coating roller of the roll coater, the upper coating roller and the lower coating roller are tightly pressed against the surface of the strip steel, the upper coating roller is responsible for coating the upper surface of the strip steel, the lower coating roller is responsible for coating the lower surface of the strip steel, and the upper liquid taking roller and the lower liquid taking roller respectively transfer chemical paint to the upper coating roller and the lower coating roller through the contact of the roller surfaces.
The prior art has the following problems in the process of coating the strip steel roller: 1) when the thickness and the wide band specification of two rolls of strip steel before and after a production line are changed, particularly when the strip steel is switched from a thin specification to a thick specification or from a narrow specification to a wide specification, the edge of the back roll of strip steel is easy to scratch the surface of a coating roller when a welding seam welded by the front roll of strip steel and the back roll of strip steel passes through the coating roller of a roll coater, or the surface is extruded and deformed to crack due to the steep increase of the local pressure on the surface of the coating roller, so that the defects of missing coating or uneven coating on the surface of the strip steel are caused, and meanwhile, the coating roller is scrapped, so that the service life of the coating roller and the product percent of pass are influenced. 2) The pressure regulation between a coating roller and a strip steel and between the coating roller and a liquid taking roller of the existing roller coater is mostly manual or automatic, wherein the manual pressure regulation mainly depends on personal experience and has large error, the automatic regulation often cannot effectively detect the normal abrasion amount of the roller surface in real time to cause large accumulated error of the pressure regulation and low pressure control precision, and the accumulated error and the pressure control precision can cause uneven radial pressure distribution of the roller surface of the coating roller to deform and crack a polyurethane material on the roller surface, so that a new scheme is urgently needed to solve the technical problem.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a roller coating control method for reducing the damage of the roller surface of a coating roller, and the technical scheme eliminates the adverse effect of the roller surface abrasion on the automatic control process by adding the automatic position zero calibration and pressure zero calibration models of a liquid taking roller and the coating roller in the roller coating leaning process and improves the pressure control precision of a roller coater; by adopting the width and thickness data of the strip steel in real time, the control model of the coating roller when the roller coating backup roller and the strip steel weld pass is optimized to reduce the partial scratch of the strip steel at the weld on the surface of the coating roller and reduce the surface deformation and cracking caused by the steep increase of the pressure of the coating roller due to the increase of the thickness of the strip steel.
In order to achieve the above object, a roll coating control method of the present invention for reducing damage to a roll surface of a coating roll, the method comprising the steps of: 1) a liquid taking roller position zero calibration control flow, a coating roller position zero calibration control flow, a liquid taking roller and backing roller control flow, a coating roller and backing roller control flow, a 4) a coating roller and backing roller control flow, and a 5) a roll coater overwelding seam control flow.
As an improvement of the present invention, the step 1) is a liquid taking roller position zero calibration control process, specifically, the roll coater controller starts the liquid taking roller position zero calibration process, the servo motor of the upper liquid taking roller moves backward at a high speed until the rack of the upper liquid taking roller moves backward to touch the stop block of the full open position of the upper liquid taking roller, at this moment, after the controller detects that the blocking of the servo motor of the upper liquid taking roller lasts for 1 second, and simultaneously the photoelectric switches of the full open position of the upper liquid taking roller corresponding to the WS and DS sides detect signals, the encoders of the servo motors corresponding to the upper liquid taking roller on the WS and DS sides perform zero calibration, and if the blocking of the servo motor lasts for 1 second and the photoelectric switch signals of the full open position are not detected, abnormal position zero calibration output alarm is performed.
As an improvement of the present invention, the step 2) is a coating roller position zero calibration control flow, specifically, the roller coater controller starts the coating roller position zero calibration flow, the coating roller servo motor moves backward at a high speed to the coating roller frame to move backward and touch the upper coating roller full-open stop, at this moment, after the controller detects that the upper coating roller servo motor is locked for 1 second, and simultaneously the upper coating roller full-open photoelectric switches corresponding to the WS and DS sides detect signals, zero calibration is performed on the WS and DS side servo motor encoders corresponding to the upper coating rollers, and if the servo motor is locked for 1 second and the full-open photoelectric switch signals are not detected, an alarm is output if the position zero calibration is abnormal.
As an improvement of the present invention, the step 3) of controlling the liquid-extracting roller-backing roller control process specifically includes controlling the liquid-extracting roller to approach the coating roller and making the pressure of the roller surface of the liquid-extracting roller reach a set value, after the roller coater controller issues a roller-backing roller instruction of the liquid-extracting roller, automatically checking whether the roller-backing condition of the liquid-extracting roller is met by the control system, namely, completing zero calibration of two servo motor encoders on WS and DS sides corresponding to the liquid-extracting roller at a full-open position; after the roller backing condition is met, two servo motors corresponding to the liquid taking roller advance in a high-speed linkage manner; when the feedback value of any one of the pressure sensors on the WS or DS of the same liquid taking roller is equal to 2KN, the two servo motors are changed into middle-speed single-action advancing; when the feedback value of any one of the pressure sensors of WS or DS of the same liquid taking roller is equal to 4KN, the corresponding pressure sensor feedback value is subjected to zero calibration and the corresponding servo motor moves forwards at a low speed in a single action mode until the corresponding pressure sensor feedback value reaches a set value. When the feedback values of the WS or DS side pressure sensors of the same liquid taking roller reach set values, the liquid taking roller backup roller completes and triggers the automatic closed-loop regulation of the pressures of the WS and DS sides of the liquid taking roller.
As an improvement of the invention, the step 4) of the roller leaning control process of the coating roller specifically comprises the following steps of controlling the coating roller to approach the strip steel and enabling the roller surface pressure of the coating roller to reach a set value; after a roller coater controller issues a roller backing instruction of a coating roller, a control system automatically checks whether the roller backing condition of the coating roller is met, namely the liquid taking roller backing roller finishes the pressure feedback values of the WS and DS sides of the liquid taking roller to reach a set value, and the coating roller finishes zero calibration of two servo motor encoders at the corresponding WS and DS sides of the coating roller at a full-open position; when the roller leaning condition is met, the servo motor of the coating roller moves forward in a high-speed linkage manner, and when the frame of the coating roller reaches the pre-leaning roller position, the servo motor moves forward in a high-speed single-action manner; when the feedback value of any one of the pressure sensors on WS or DS of the same coating roller is equal to 3KN, the two servo motors are changed into middle-speed single-action advancing; when the feedback value of any one side pressure sensor of WS or DS of the same coating roller is equal to 5KN, the value of the side pressure sensor is corrected to zero and the servo motor corresponding to the side is changed into ultra-low speed single-action advancing, and the servo motor stops advancing until the feedback value of the side pressure sensor is equal to a set value; when the feedback values of the WS or DS side pressure sensors of the same coating roller reach the set values, the coating roller backing roller process is completed and the automatic closed-loop regulation of the pressure of the coating roller is triggered.
As an improvement of the invention, the step 5) is a roll coating machine overwelding control flow, specifically, the roll coating control flow is that when a welded seam of rolled strip steel before and after production line passes through the roll coating machine, when the welded seam reaches a signal received 5m before roll coating, a roll coating controller immediately starts the roll coating overwelding flow, a servo motor of a coating roll retreats in an ultra-high speed linkage manner and collects and compares the width difference of strip steel before and after roll coating, and when the width difference of strip steel after current roll coating is less than or equal to 50mm, the servo motor of the coating roll frame retreats by 18mm and stops retreating; when the width difference of the front back-rolled strip steel is more than 50mm, the servo motor of the coating roller stops backing after the coating roller frame backs by 25 mm; when the controller receives a signal that a welding seam passes through the roller coating roller, the controller controls the servo motors of the coating roller to advance at a high speed in a single motion mode, and when the feedback value of any one side pressure sensor of WS or DS of the same coating roller is equal to 3KN, the two servo motors are changed into the servo motors to advance at a low speed in a single motion mode; when the feedback value of any one side pressure sensor of WS or DS of the same coating roller is equal to 5KN, the value of the side pressure sensor is corrected to zero and the servo motor corresponding to the side is changed into ultra-low speed single-action advancing, and the servo motor stops advancing until the feedback value of the side pressure sensor is equal to a set value; when the feedback values of the WS or DS side pressure sensors of the same coating roller reach the set values, the roll coater over-welding seam flow is completed and the automatic closed-loop regulation of the pressure of the coating roller is triggered.
As an improvement of the invention, the full open position of the liquid taking roller is the position of a frame of the liquid taking roller when the roller surface of the liquid taking roller is 20mm away from the horizontal projection distance of the roller surface of the coating roller in the roller diameter state of a standard liquid taking roller and the coating roller; the full-open position of the coating roller is the position of a frame of the coating roller when the horizontal projection of the roller surface of the coating roller is 35mm away from the rolling line of the unit under the roller diameter state of the standard coating roller; the pre-leaning roller position is the position of a coating roller frame when the horizontal projection of the roller surface of the coating roller is 2mm away from the corresponding surface of the steel strip with the thickest specification.
As an improvement of the invention, the photoelectric switch adopts a correlation type photoelectric switch with the detection precision of 0.1mm, and can effectively detect the full open position of the coating roller (liquid taking roller) at a long distance and high precision.
As an improvement of the invention, the ultra-high speed, the medium speed, the low speed and the ultra-low speed refer to the speed of the horizontal movement of the application roller or the liquid taking roller in the process of approaching or departing from the direction of the strip steel, wherein the ultra-high speed is 10mm/s, the high speed is 4mm/s, the medium speed is 2mm/s, the low speed is 0.1mm/s and the ultra-low speed is 0.05 mm/s.
As an improvement of the invention, the single action is that two servo motors at the WS side and the DS side corresponding to the same coating roller or the same liquid taking roller are respectively and independently driven and controlled, and the linkage is that two servo motors at the WS side and the DS side corresponding to the same coating roller or the same liquid taking roller are synchronously driven and controlled, the forward movement refers to that the coating roller or the liquid taking roller horizontally moves towards the direction close to the strip steel, and the backward movement refers to that the coating roller or the liquid taking roller horizontally moves away from the strip steel. The automatic pressure closed-loop regulation refers to that after each single servo motor is compared with a set value according to a corresponding pressure sensor feedback value, the pressure closed-loop dynamic tracking and automatic regulation are carried out on the servo motor through a controller.
Compared with the prior art, the invention has the advantages that 1) the system before the coating roller and the liquid taking roller of the roller coater leans against the roller automatically checks the condition of the liquid taking roller for detection, namely, the position of the coating roller and the liquid taking roller is corrected to zero before the roller leans against the roller each time, thereby improving the precision of system control and adjustment and reducing errors; 2) before the backup roller of the coating roller, the automatic backup roller of the liquid taking roller is completed, and the pressure between the liquid taking roller and the coating roller reaches a set value, so that the interference error of the two backup rollers at the same time is avoided; 3) the control of different speeds of a servo motor is switched by setting the pre-backup roller and different pressure points, so that the quick control is realized, and the system inertia and the overshoot error are reduced; 4) the adverse effect of friction force of a liquid taking roller and a coating roller frame on a pressure detection value is effectively eliminated by setting different pressure correction values, so that a pressure feedback value is closer to reality and more effective; 5) in the roll coater over-welding seam control, a coating roll servo motor is adopted to quickly separate a coating roll before the welding seam arrives and press the coating roll after the pressure is zero, so that the roll surface mechanical impact caused by the opening action of a cylinder or a hydraulic cylinder used in the traditional over-welding seam is eliminated, and the roll surface of the coating roll is effectively protected; 6) the specification data of the rolled strip steel is collected in real time in the roll coater over-weld control, meanwhile, the open position of the over-weld of the coating roll is adjusted in real time according to different width differences and thicknesses of the strip steel, the scratch of the roll surface of the coating roll at the position of the weld of the strip steel is effectively eliminated, meanwhile, the fast control of the over-weld of the roll coating is realized, the over-weld adjusting time is shortened, the amount of products which are not roll-coated before and after the weld is reduced, and the product yield is improved.
Drawings
FIG. 1 is a schematic diagram of the operation of a conventional roll coater according to the present invention.
FIG. 2 is a schematic diagram of a roll coater configuration as described herein.
FIG. 3 is a schematic diagram illustrating the control positions of the roll coater of the present invention.
FIG. 4 is a control flow for zero calibration of the position of the liquid-taking roller according to the present invention.
FIG. 5 illustrates a control flow for zero calibration of the position of the applicator roll in accordance with the present invention.
FIG. 6 shows a control flow of the liquid-extracting roller and the roller backup according to the present invention.
FIG. 7 illustrates a roller backup control flow of the applicator roller according to the present invention.
FIG. 8 illustrates a flow of controlling the flow of the over-weld of the roll coater according to the present invention
In the figure: 1-strip steel, 2-upper coating roll, 3-upper liquid-taking roll, 4-lower coating roll, 5-lower liquid-taking roll, 6-upper coating roll WS-side servomotor, 7-upper coating roll DS-side servomotor, 8-upper liquid-taking roll WS-side servomotor, 9-upper liquid-taking roll DS-side servomotor, 10-lower coating roll WS-side servomotor, 11-lower coating roll DS-side servomotor, 12-lower liquid-taking roll WS-side servomotor, 13-lower liquid-taking roll DS-side servomotor, 14-upper coating roll WS-side pressure sensor, 15-upper coating roll DS-side pressure sensor, 16-upper liquid-taking roll WS-side pressure sensor, 17-upper liquid-taking roll DS-side pressure sensor, 18-lower coating roll WS-side pressure sensor, 19-lower coating roll DS-side pressure sensor, 20-lower tapping roll WS-side pressure sensor, 21-lower tapping roll DS-side pressure sensor, 30-lower tapping roll DS-side frame, 31-lower tapping roll WS-side frame, 32-lower coating roll DS-side frame, 33-lower coating roll WS-side frame, 40-upper tapping roll DS-side frame, 41-upper tapping roll WS-side frame, 42-upper coating roll DS-side frame, 43-upper coating roll WS-side frame, 51-upper coating roll WS-side full-on photoelectric switch PH1, 52-upper coating roll DS-side full-on photoelectric switch PH2, 53-upper tapping roll WS-side full-on photoelectric switch PH3, 54-upper tapping roll DS-side full-on photoelectric switch PH4, 55-lower coating roll DS-side full-on photoelectric switch PH5, 56-lower coating roll DS-side full-on photoelectric switch PH6, 57-lower tapping roll WS-side full-on photoelectric switch PH7, 58-lower liquid taking roller DS side full-open photoelectric switch PH8, 61-upper liquid taking roller WS side full-open stop, 62-upper liquid taking roller DS side full-open stop, 63-upper liquid taking roller WS side full-open stop, 64-upper liquid taking roller DS side full-open stop, 65-lower liquid taking roller WS side full-open stop, 66-lower liquid taking roller DS side full-open stop, 67-lower liquid taking roller WS side full-open stop, 68-lower liquid taking roller DS side full-open stop.
The specific implementation mode is as follows:
for the purpose of enhancing an understanding of the present invention, the present embodiment will be described in detail below with reference to the accompanying drawings.
Example 1: referring to fig. 1-2, the invention provides a roll coating control method for reducing damage to roll surfaces of coating rolls of a four-roll vertical roll coater used in a post-treatment roll coating process of a cold-rolling hot-dip aluminum zinc production line, wherein the roll coater comprises an upper coating roll 2/4, a lower coating roll 2/4 and an upper liquid taking roll 3/5, and each roll is respectively installed on a respective machine frame 30-33 and 40-43 through bearing seats at two ends.
The upper liquid taking roller frame 40/41 is correspondingly mounted on the upper coating roller frame 42/43 through sliding tables, the upper coating roller frame 42/43 is correspondingly mounted on the roller coater base through sliding tables, the lower liquid taking roller frame 30/31 is correspondingly mounted on the lower coating roller frame 32/33 through sliding tables, and the lower coating roller frame 32/33 is mounted on the roller coater base through sliding tables. The strip passes vertically between the upper and lower coating rollers 2/4, each of which is moved horizontally on a corresponding slide by respective WS and DS servo motors 6-12. The frames on both sides of the upper and lower coating rollers 2/4 are respectively provided with roller full-open photoelectric switches 51-58 and full-open stoppers 61-68.
Referring to fig. 3, the fully open position a0 of the liquid extraction roller 3/5 is the liquid extraction roller stand position L1 when the surface of the liquid extraction roller 3/5 is separated from the horizontal projection distance of 20mm from the surface of the application roller 2/4 in the state of the standard liquid extraction roller and the coating roller diameter. The full open position B0 of applicator roll 2/4 is the applicator roll stand position L2 when the horizontal projection of the surface of applicator roll 2/4 is 35mm from the mill pass line of the mill train in the standard applicator roll diameter state. Wherein the content of the first and second substances,
L1＝R1+R2+L0；
L2＝2*R2+T/2+L0’；
l0, which is the regulating quantity and takes the value of 20 mm;
l0': the value is 2mm for regulating quantity;
r1 is the radius of a standard liquid taking roller;
r2 is the radius of a standard liquid taking roller;
t is the thickness of the thickest strip steel;
referring to fig. 4 to 8, a roll coating control method for reducing damage to a roll surface of a coating roll includes the following control processes:
1) and (3) a liquid taking roller position zero calibration control flow: in this embodiment, the liquid extracting roller 3 is explained as an example. The roll coater controller starts a liquid taking roller position zero calibration flow, an upper liquid taking roller servo motor 8/9 singly moves backwards at a high speed (4mm/s) to an upper liquid taking roller frame 40/41 to touch an upper liquid taking roller full-open-position stop 63/64 in a backward mode, at the moment, the controller detects that the upper liquid taking roller servo motor 8/9 is locked and rotates for 1 second, meanwhile, an upper liquid taking roller full-open-position photoelectric switch 53/54 corresponding to the WS side and the DS side detects signals, zero calibration is carried out on encoders of the WS side servo motor 8/9 corresponding to the upper liquid taking roller 3, and abnormal position zero calibration output alarm is carried out if the servo motor 8/9 is locked and rotates for 1 second and the full-open-position photoelectric switch 53/54 signals are not detected.
2) And (3) a coating roller position zero calibration control flow: the present embodiment is described by taking the coating roller 2 as an example. The roller coater controller starts a coating roller position zero calibration flow, the coating roller servo motor 6/7 singly moves backward at a high speed (4mm/s) to the upper coating roller frame 43/43 to touch the upper coating roller full-open stop 61/62, at the moment, after the controller detects that the upper coating roller servo motor 6/7 is locked for 1 second, and simultaneously the upper coating roller full-open photoelectric switch 51/52 corresponding to the WS side and the DS side detects signals, zero calibration is carried out on WS side and DS side servo motor 6/7 encoders corresponding to the upper coating roller 2, and if the servo motor 6/7 is locked for 1 second and the full-open photoelectric switch 51/52 signals are not detected, abnormal position zero calibration output alarm is carried out.
3) Liquid taking roller and backing roller control flow: that is, the present embodiment is described by taking the liquid extracting roller 3 as an example, in which the process of controlling the liquid extracting roller to approach the coating roller and bringing the roller surface pressure of the liquid extracting roller to a set value is performed. After the roller coater controller issues a roller leaning instruction of the upper liquid taking roller 3, the control system automatically checks whether the roller leaning condition of the upper liquid taking roller is met, namely, the upper liquid taking roller completes zero calibration at two servo motors 8/9 on the WS side and the DS side corresponding to the upper liquid taking roller at the full-open position. After the roller leaning condition is met, the two servo motors 8/9 corresponding to the upper liquid taking rollers advance in a linkage manner at a high speed (4 mm/s). When the feedback value of the pressure sensor 16/17 on either side of the WS or DS of the upper liquid taking roller 3 is equal to 2KN, the two servo motors are changed into middle-speed single-action advancing. When the feedback value of any one of the pressure sensors of WS or DS of the upper liquid taking roller 3 is equal to 4KN, the corresponding pressure sensor feedback value is subjected to zero calibration and the corresponding servo motor moves forward at a low speed in a single action mode until the corresponding pressure sensor feedback value reaches a set value. When the feedback values of the WS or DS side pressure sensors of the upper liquid taking roller 3 reach set values, the upper liquid taking roller 3 is pressed against the roller to complete and trigger the automatic closed-loop regulation of the pressures of the WS and DS sides of the liquid taking roller.
4) The coating roller backup control flow comprises the following steps: that is, the process of controlling the application roller to approach the strip steel and making the roll surface pressure of the application roller reach the set value is explained below by taking the application roller 4 as an example in the present embodiment. After the roller coater controller issues a lower coating roller leaning instruction, the control system automatically checks whether the roller leaning condition of the lower coating roller 4 is met, namely the lower liquid taking roller 5 leans against the roller to finish the pressure feedback values of the WS and DS sides of the lower liquid taking roller to reach the set value, and the encoders of two servo motors 10/11 at the WS and DS sides corresponding to the lower coating roller 4 at the full-open position are calibrated to be zero. When the roller leaning condition is met, the servo motor 10/11 of the lower coating roller advances at a high speed (4mm/s) in a linkage manner, and when the lower coating roller frame reaches a pre-roller leaning position B0, the servo motor 10/11 advances at a high speed (4mm/s) in a single-action manner. When the feedback value of the pressure sensor 18/19 on either side of WS or DS of the lower coating roller 4 is equal to 3KN, the two servo motors 10/11 are changed to single-action advance at a medium speed (2 mm/s). When the feedback value of any one of the pressure sensors of WS or DS of the lower coating roller is equal to 5KN, the value of the pressure sensor 18/19 is corrected to zero, and the servo motor 10/11 stops advancing when the feedback value of the pressure sensor 18/19 is equal to the set value and the servo motor 10/11 corresponding to the side is changed to ultralow speed (0.1mm/s) for single-action advancing. When the feedback values of the WS or DS side pressure sensor 18/19 of the applicator roll both reach the set values, the lower applicator roll backup process is completed and triggers the automatic closed loop adjustment of the lower applicator roll pressure.
5) The roll coater weld passing control process comprises the following steps: that is, the flow of roll coating control when the welded bead of the coil steel passes through the roll coater before and after the production line, and the control of the upper and lower coating rolls 2/4 only when the bead passes, the following coating roll 4 in this embodiment will be described as an example. When a signal of 5 meters before the welding line reaches the roller coating is received, the roller coating controller immediately starts the roller coating welding line passing process, and the lower coating roller servo motor 10/11 retreats in an ultra-high speed (10mm/s) linkage mode and collects and compares the width difference of the front and rear coiled steel strips. When the width difference of the front back-rolled strip steel is less than or equal to 50mm, the servo motor 10/11 stops backing after the rack 32/32 of the lower coating roller 4 backs by 18 mm; when the width difference of the current back-rolled strip steel is more than 50mm, the servo motor 10/11 of the lower coating roller 4 stops backing after the machine frame 32/32 backs to the position of 25 mm. When the controller receives a signal that a welding seam passes through the coating roller, the controller controls the lower coating roller servo motor 10/11 to advance singly at a high speed (4mm/s), and when the feedback value of any one of the pressure sensors 18/19 of WS or DS of the lower coating roller 4 is equal to 3KN, the two servo motors 10/11 are changed to advance singly at a low speed (0.1 mm/s). When the feedback value of any one of the pressure sensors 18/19 of WS or DS of the lower coating roller 4 is equal to 5KN, the value of the pressure sensor 18/19 is corrected to zero and the servo motor 10/11 corresponding to the side is changed to be single-action advancing at ultra-low speed (0.05mm/s), and the servo motor 10/11 stops advancing until the feedback value of the pressure sensor 18/19 is equal to the set value. When the feedback values of the WS or DS side pressure sensor 18/19 of the lower coating roller reach the set values, the roll coater over-weld flow is completed and triggers the automatic closed-loop regulation of the pressure of the lower coating roller 4.
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.
Claims (4)
1. A roll coating control method for reducing damage to a roll surface of a coating roll, the method comprising the steps of: 1) a liquid taking roller position zero calibration control flow, a coating roller position zero calibration control flow, a liquid taking roller backing roller control flow, a coating roller backing roller control flow, and a roll coater overwelding seam control flow;
the step 1) is a liquid taking roller position zero calibration control process, specifically, a roller coater controller starts a liquid taking roller position zero calibration process, an upper liquid taking roller servo motor singly moves backwards to an upper liquid taking roller frame at a high speed to touch an upper liquid taking roller full-open position stop block, the controller detects that the upper liquid taking roller servo motor is locked and rotated for 1 second, meanwhile, the upper liquid taking roller full-open position photoelectric switches corresponding to the WS and DS sides detect signals, zero calibration is carried out on WS and DS side servo motor encoders corresponding to the upper liquid taking roller, and if the servo motor is locked and rotated for 1 second and the full-open position photoelectric switch signals are not detected, abnormal position zero calibration output alarm is carried out;
the step 2) is a coating roller position zero calibration control flow, specifically, a coating roller controller starts a coating roller position zero calibration flow, a coating roller servo motor moves backwards to a coating roller frame at a high speed and singly moves backwards to touch an upper coating roller full-open stop block, the controller detects that the upper coating roller servo motor is blocked for 1 second at the moment, simultaneously, the controller detects signals from upper coating roller full-open photoelectric switches corresponding to the WS and DS sides, zero calibration is carried out on servo motor encoders corresponding to the upper coating roller, and if the servo motor is blocked for 1 second and the full-open photoelectric switch signals are not detected, abnormal position zero calibration output alarm is carried out;
the step 3) is a liquid taking roller backing control process, specifically, the process that the liquid taking roller is controlled to be close to the coating roller and the pressure of the roller surface of the liquid taking roller reaches a set value is performed, after a roller coater controller issues a liquid taking roller backing instruction, a control system automatically checks whether the conditions of the liquid taking roller backing are met, namely, the zero calibration of two servo motor encoders on the WS side and the DS side corresponding to the liquid taking roller at the full-open position of the liquid taking roller is completed; after the roller backing condition is met, two servo motors corresponding to the liquid taking roller advance in a high-speed linkage manner; when the feedback value of any one of the pressure sensors on the WS or DS of the same liquid taking roller is equal to 2KN, the two servo motors are changed into middle-speed single-action advancing; when the feedback value of any one of the WS or DS side pressure sensors of the same liquid taking roller is equal to 4KN, the corresponding pressure sensor feedback value is subjected to zero calibration and the corresponding servo motor moves forward at a low speed in a single motion mode until the corresponding pressure sensor feedback value reaches a set value, and when the feedback values of the WS or DS side pressure sensors of the same liquid taking roller reach the set value, the liquid taking roller backup roller completes and triggers the respective pressure automatic closed-loop regulation of the WS and DS sides of the liquid taking roller;
the step 4) is a coating roller backing control flow, specifically a process of controlling the coating roller to approach the strip steel and enabling the pressure of the roller surface of the coating roller to reach a set value; after a roller coater controller issues a roller backing instruction of a coating roller, a control system automatically checks whether the roller backing condition of the coating roller is met, namely the liquid taking roller backing roller finishes the pressure feedback values of the WS and DS sides of the liquid taking roller to reach a set value, and the coating roller finishes zero calibration of two servo motor encoders at the corresponding WS and DS sides of the coating roller at a full-open position; when the roller leaning condition is met, the servo motor of the coating roller moves forward in a high-speed linkage manner, and when the frame of the coating roller reaches the pre-leaning roller position, the servo motor moves forward in a high-speed single-action manner; when the feedback value of any one of the pressure sensors on WS or DS of the same coating roller is equal to 3KN, the two servo motors are changed into middle-speed single-action advancing; when the feedback value of any one side pressure sensor of WS or DS of the same coating roller is equal to 5KN, the value of the side pressure sensor is corrected to zero and the servo motor corresponding to the side is changed into ultra-low speed single-action advancing, and the servo motor stops advancing until the feedback value of the side pressure sensor is equal to a set value; when the feedback values of the WS or DS side pressure sensors of the same coating roller reach set values, the backup roller flow of the coating roller is completed and the automatic closed-loop regulation of the pressure of the coating roller is triggered;
the step 5) is a roll coating machine over-welding control flow, specifically, the roll coating control flow is that when a welded seam of front and rear rolled strip steels of a production line passes through the roll coating machine, when a signal of 5 meters before the welded seam is received by the roll coating machine, a roll coating controller immediately starts the roll coating over-welding flow, a servo motor of a coating roll retreats in an ultra-high speed linkage manner and collects and compares the width difference of the front and rear rolled strip steels, and when the width difference of the front and rear rolled strip steels is less than or equal to 50mm, the servo motor of the coating roll frame retreats by 18mm and stops retreating; when the width difference of the front back-rolled strip steel is more than 50mm, the servo motor of the coating roller stops backing after the coating roller frame backs by 25 mm; when the controller receives a signal that a welding seam passes through the roller coating roller, the controller controls the servo motors of the coating roller to advance at a high speed in a single motion mode, and when the feedback value of any one side pressure sensor of WS or DS of the same coating roller is equal to 3KN, the two servo motors are changed into the servo motors to advance at a low speed in a single motion mode; when the feedback value of any one side pressure sensor of WS or DS of the same coating roller is equal to 5KN, the value of the side pressure sensor is corrected to zero and the servo motor corresponding to the side is changed into ultra-low speed single-action advancing, and the servo motor stops advancing until the feedback value of the side pressure sensor is equal to a set value; when the feedback values of the WS or DS side pressure sensors of the same coating roller reach the set values, the roll coater over-welding seam flow is completed and the automatic closed-loop regulation of the pressure of the coating roller is triggered.
2. The roll coating control method for reducing the damage of the roll surface of the coating roll according to claim 1, wherein the full open position of the liquid taking roll is the position of a stand of the liquid taking roll when the roll surface of the liquid taking roll is 20mm away from the horizontal projection distance of the roll surface of the coating roll in the roll diameter state of a standard liquid taking roll and the coating roll; the full-open position of the coating roller is the position of a frame of the coating roller when the horizontal projection of the roller surface of the coating roller is 35mm away from the rolling line of the unit under the roller diameter state of the standard coating roller; the pre-leaning roller position is the position of a coating roller frame when the horizontal projection of the roller surface of the coating roller is 2mm away from the corresponding surface of the steel strip with the thickest specification.
3. The roll coating control method for reducing the damage of the roll surface of the coating roll as claimed in claim 2, wherein the photoelectric switch adopts a correlation type photoelectric switch with the detection precision of 0.1mm, and can effectively detect the full open position of the coating roll and the liquid taking roll.
4. The method of claim 3, wherein the ultra high speed, medium speed, low speed, ultra low speed coating roll or pick-up roll is moved horizontally in a direction approaching or moving away from the strip steel at a speed of 10mm/s for the ultra high speed, 4mm/s for the high speed, 2mm/s for the medium speed, 0.1mm/s for the low speed, and 0.05mm/s for the ultra low speed.
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| CN112090676A (en) * | 2020-08-14 | 2020-12-18 | 武汉钢铁有限公司 | Method and device for judging missing coating fault of roller coater |
| CN115487991B (en) * | 2022-08-12 | 2024-02-23 | 中冶南方工程技术有限公司 | Over-welding method of roller coater for continuous production of strip steel |
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