CN114558896B - Anti-overshoot aluminum cold rolling mill thickness difference adjusting device and method - Google Patents

Anti-overshoot aluminum cold rolling mill thickness difference adjusting device and method Download PDF

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Publication number
CN114558896B
CN114558896B CN202210396965.1A CN202210396965A CN114558896B CN 114558896 B CN114558896 B CN 114558896B CN 202210396965 A CN202210396965 A CN 202210396965A CN 114558896 B CN114558896 B CN 114558896B
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relay
thickness difference
agc
apc
thickness
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CN114558896A (en
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黄基彬
周国彬
张彩金
黄福勋
林盛
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Zhonglv Southeast Material Institute Fujian Technology Co ltd
Chinalco Ruimin Co Ltd
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Zhonglv Southeast Material Institute Fujian Technology Co ltd
Chinalco Ruimin Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/16—Adjusting or positioning rolls
    • B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
    • B21B31/32—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis by liquid pressure, e.g. hydromechanical adjusting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/165—Control of thickness, width, diameter or other transverse dimensions responsive mainly to the measured thickness of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B2038/004—Measuring scale thickness
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)

Abstract

The invention relates to an overshoot-preventing aluminum cold rolling mill thickness difference adjusting device and method, wherein the device comprises a rolling working roll, a thickness gauge, a controller, a first relay, a second relay, an AGC system and an APC system, the rolling working roll comprises an upper working roll, a lower working roll and a driving mechanism, the upper working roll and the lower working roll are respectively arranged on the upper side and the lower side of a conveyed aluminum strip, and the lower working roll is arranged on the driving mechanism so as to adjust the roll gap width between the upper working roll and the lower working roll under the driving of the lower working roll; the AGC system and the APC system are electrically connected with the driving mechanism, the thickness gauge is electrically connected with the AGC system and the controller respectively, the controller controls the coil of the first relay or the coil of the second relay to be powered on, and normally open contacts of the first relay and the second relay are connected to power supply circuits of the AGC system and the APC system respectively, so that the AGC system or the APC system can work when the first relay or the second relay is powered on. The device and the method are not only beneficial to preventing the thickness difference of the aluminum cold rolling mill from overshooting, but also simple in structure and easy to realize.

Description

Anti-overshoot aluminum cold rolling mill thickness difference adjusting device and method
Technical Field
The invention belongs to the technical field of aluminum strip production, and particularly relates to an overshoot-preventing thickness difference adjusting device and method for an aluminum cold rolling mill.
Background
In the production process of the cold rolling mill, a thickness gauge is an indispensable device, a part of aluminum cold rolling mill is only installed on the outlet side of the mill due to various reasons such as installation space, a closed loop system is formed by thickness difference signals of the thickness gauge on the outlet side and a set thickness reference of the strip during the production of the aluminum cold rolling mill, the thickness is controlled in a closed loop mode by correcting a roll gap reference, and the thickness of the strip is controlled in an allowable deviation range. When the monitoring AGC is used for control, due to the structural limitation of the cold rolling mill, the installation position of the outlet thickness gauge is at a certain distance from the roll gap, so that the thickness detected by the thickness gauge is not the real-time thickness of the roll gap position, and certain hysteresis exists in the process of adjusting the thickness of the roll gap position by using the thickness of the outlet position. When the thickness difference fluctuation is smaller, the control mode can basically meet the production requirement, but the special condition that the thickness gauge is possibly influenced by environmental factors such as oil gas, vibration and the like and the thickness difference signal fluctuation is large is omitted. When the special condition occurs, the monitoring AGC control can adjust the roll gap according to the thickness difference signal of the thickness gauge, and the larger the thickness difference signal is, the larger the roll gap adjustment is, so that the problem that when the thickness difference fluctuation is large, the larger the roll gap adjustment force is, the thickness difference overshoot is caused. The overshoot problem can lead to thicker or thinner strips, affect the rolling of the next pass, even cause strip rolling leakage or strip breakage when severe, have great influence on product quality and yield, and the monitoring AGC program of part of cold rolling mills is not opened for confidentiality, so that the overshoot problem can not be avoided by modifying the AGC program.
Disclosure of Invention
The invention aims to provide an overshoot-preventing thickness difference adjusting device and method for an aluminum cold rolling mill, which are beneficial to preventing thickness difference overshoot of the aluminum cold rolling mill, simple in structure and easy to realize.
In order to achieve the above purpose, the invention adopts the following technical scheme: an anti-overshoot aluminum cold rolling mill thickness difference adjusting device comprises a rolling working roller, a thickness gauge, a controller, a first relay, a second relay, an AGC system and an APC system, wherein the rolling working roller comprises an upper working roller, a lower working roller and a driving mechanism, the upper working roller and the lower working roller are respectively arranged on the upper side and the lower side of a conveyed aluminum strip, and the lower working roller is arranged on the driving mechanism so as to move up and down under the driving of the lower working roller, and the width of a roll gap between the upper working roller and the lower working roller is adjusted; the AGC system and the APC system are electrically connected with the driving mechanism, the thickness gauge is electrically connected with the AGC system and the controller respectively, the controller controls the coil of the first relay or the coil of the second relay to be electrified, the normally open contact of the first relay is connected with the power supply circuit of the AGC system, and the normally open contact of the second relay is connected with the power supply circuit of the APC system so as to enable the AGC system or the APC system to work when the first relay or the second relay is electrified.
Further, the controller respectively controls the first electric control switch on the power supply line of the first relay coil and the second electric control switch on the power supply line of the second relay coil, so as to control the second electric control switch or the first electric control switch to be closed according to whether the thickness difference signal exceeds the fluctuation threshold value, and further the coil of the second relay or the coil of the first relay is powered on.
Further, the first electric control switch and the second electric control switch are provided with interlocking, so that the two electric control switches cannot be closed at the same time, and further the coil of the first relay and the coil of the second relay cannot be powered on at the same time.
Further, the automatic gain control device also comprises an AGC switch button and an APC switch button, wherein the AGC switch button and a normally open contact of the first relay are connected in parallel to a power supply circuit of the AGC system, and the APC switch button and a normally open contact of the second relay are connected in parallel to the power supply circuit of the APC system so as to manually select a control mode.
Further, the AGC switch button and the APC switch button are both delay power-off switches, and the AGC switch button is interlocked with the second electric control switch, and the APC switch button is interlocked with the first electric control switch, so that the AGC switch button and the second electric control switch are not closed at the same time, and the APC switch button and the first electric control switch are not closed at the same time.
Further, the upper working roll is rotationally connected with two upper bearing seats on the left side and the right side of the upper working roll, and the two upper bearing seats are fixedly arranged on a frame of the aluminum cold rolling mill; the lower working roll is rotationally connected with two lower bearing seats on the left side and the right side of the lower working roll, the driving mechanism comprises a left hydraulic cylinder, a right hydraulic cylinder, a left servo valve and a right servo valve, the left lower bearing seat and the right lower bearing seat are respectively arranged on the corresponding hydraulic cylinders so as to drive the lower working roll to lift, and the two servo valves are respectively connected with the corresponding hydraulic cylinders so as to control the hydraulic cylinders to work; the AGC system and the APC system are electrically connected with the two servo valves.
Further, the aluminum cold rolling mill comprises an uncoiler, a deflection roller, a rolling working roller, a plate roller and a coiling machine, and is driven by respective motors, and aluminum strips are uncoiled by the uncoiler, rolled by the rolling working roller and then coiled by the coiling machine.
The invention also provides an overshoot-preventing aluminum cold rolling mill thickness difference adjusting method based on the device, which comprises the following steps:
s1, after an aluminum cold rolling mill starts rolling work, a controller automatically calculates a thickness difference fluctuation threshold according to a rolling state and a rolling thickness;
s2, the controller compares the thickness difference signal measured by the thickness gauge in real time with the thickness difference fluctuation threshold in real time, if the real-time thickness difference value is equal to the thickness difference fluctuation threshold, the coil of the second relay is automatically controlled to be powered on, the power supply circuit of the APC system is connected, the coil of the first relay is simultaneously controlled to be powered off, and the power supply circuit of the AGC system is cut off, so that the thickness difference control mode is switched from the monitoring AGC to the APC position control, otherwise, the monitoring AGC mode is kept;
and S3, when the real-time thickness difference value measured by the thickness gauge is continuously smaller than the thickness difference fluctuation threshold value for n seconds during APC position control, automatically switching the thickness difference control mode from APC position control to monitoring AGC control.
Further, in the step S1, the method for calculating the thickness difference fluctuation threshold according to the rolling speed state and the rolling thickness is as follows: when the rolling speed is in the speed increasing section or the speed decreasing section, the thickness difference fluctuation threshold value=the outlet thickness set value h is 3%, and when the rolling speed is in the speed stabilizing section, the thickness difference fluctuation threshold value=the outlet thickness set value h is 2%.
Compared with the prior art, the invention has the following beneficial effects: the device and the method can solve the problem of monitoring the excessive thickness difference of the AGC caused by the excessive thickness difference signal of the thickness gauge, and switch the monitoring AGC and the APC position control modes according to the real-time change of the thickness difference signal by a designed controller, thereby improving the yield. Moreover, the device is realized independently of whether the AGC internal program is opened or not, has simple structure and easy realization, and is particularly suitable for monitoring the cold rolling mill of which the AGC program is not opened. Therefore, the invention has strong practicability and wide application prospect.
Drawings
Fig. 1 is a schematic view of the structure of an apparatus according to an embodiment of the present invention.
Fig. 2 is a control schematic diagram of a controller in an embodiment of the present invention.
Fig. 3 is a control schematic of an AGC system in an embodiment of the present invention.
FIG. 4 is a control schematic of the APC system in the embodiment of the present invention.
Fig. 5 is a schematic diagram of a method implementation of an embodiment of the present invention.
Fig. 6 is a schematic drawing of rolling speed in an embodiment of the present invention.
FIG. 7 is a schematic diagram of an optimized thickness difference in an embodiment of the present invention.
FIG. 8 is a schematic diagram of differential thickness overshoot prior to optimization in an embodiment of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
As shown in fig. 1 to 4, the present embodiment provides an overshoot-preventing aluminum cold rolling mill thickness difference adjusting device, which comprises a rolling working roll, a thickness gauge 7, a controller 12, a first relay 13, a second relay 14, an AGC system 10 and an APC system 11, wherein the rolling working roll comprises an upper working roll 1, a lower working roll 2 and a driving mechanism, the upper working roll and the lower working roll are respectively arranged on the upper side and the lower side of a conveyed aluminum strip, and the lower working roll 2 is arranged on the driving mechanism so as to move up and down under the driving of the lower working roll to adjust the roll gap width between the upper working roll and the lower working roll; the AGC system 10 and the APC system 11 are electrically connected with the driving mechanism, the thickness gauge 7 is electrically connected with the AGC system 10 and the controller 12 respectively, the controller 12 controls the coil of the first relay 13 or the coil of the second relay 14 to be electrified, the normally open contact of the first relay 13 is connected with the power supply circuit of the AGC system 10, and the normally open contact of the second relay 14 is connected with the power supply circuit of the APC system 11 so as to enable the AGC system or the APC system to work when the first relay or the second relay is electrified.
As shown in fig. 2, the controller respectively controls the first electrically controlled switch K1 on the power supply line of the coil 131 of the first relay KA1 and the second electrically controlled switch K2 on the power supply line of the coil 141 of the second relay KA2 to control the second electrically controlled switch K2 or the first electrically controlled switch K1 to be closed according to whether the thickness difference signal exceeds the fluctuation threshold value, so as to enable the coil of the second relay KA2 or the coil of the first relay KA1 to be powered.
In this embodiment, the first electric control switch K1 and the second electric control switch K2 are provided with an interlock, so that the two electric control switches are not closed at the same time, and thus the coil of the first relay and the coil of the second relay are not powered on at the same time.
As shown in fig. 1, 3 and 4, the device further comprises an AGC switch button 15 and an APC switch button 16, wherein the AGC switch button 15 and a normally open contact 132 of the first relay KA1 are connected in parallel to a power supply line of the AGC system, and the APC switch button 16 and a normally open contact 142 of the second relay KA2 are connected in parallel to the power supply line of the APC system, so as to manually select a control mode.
In this embodiment, the AGC switch button and the APC switch button are both delay power-off switches, so that when the system is started, one control mode is initially selected to start working. Moreover, the AGC switch button is interlocked with the second electric control switch, and the APC switch button is interlocked with the first electric control switch, so that the AGC switch button and the second electric control switch are not closed at the same time, and the APC switch button and the first electric control switch are not closed at the same time.
In the embodiment, the upper working roll 1 is rotationally connected with two upper bearing seats on the left side and the right side of the upper working roll, and the two upper bearing seats are fixedly arranged on a stand of an aluminum cold rolling mill; the lower working roll 2 is rotationally connected with two lower bearing seats on the left side and the right side of the lower working roll 2, the driving mechanism comprises a left hydraulic cylinder 8, a right hydraulic cylinder 8, a left servo valve 9 and a right servo valve 9, the left lower bearing seat and the right lower bearing seat are respectively arranged on the corresponding hydraulic cylinders 8 so as to drive the lower working roll to lift, and the two servo valves 9 are respectively connected with the corresponding hydraulic cylinders 8 so as to control the hydraulic cylinders 8 to work; the AGC system 10 and APC system 11 are electrically connected to the two servo valves 9.
As shown in FIG. 5, the embodiment provides an overshoot-preventing aluminum cold-rolling mill thickness difference adjusting method based on the device, which comprises the following steps:
and S1, after the aluminum cold rolling mill starts rolling, the controller automatically calculates a thickness difference fluctuation threshold value, namely an allowable fluctuation value, according to the rolling state and the rolling thickness.
And S2, the controller compares the thickness difference signal measured by the thickness gauge in real time with the thickness difference fluctuation threshold in real time, if the real-time thickness difference value is equal to the thickness difference fluctuation threshold, the coil of the second relay is automatically controlled to be powered on, the power supply circuit of the APC system is connected, the coil of the first relay is simultaneously controlled to be powered off, and the power supply circuit of the AGC system is cut off, so that the thickness difference control mode is switched from the monitoring AGC to the APC position control, and otherwise, the monitoring AGC mode is kept.
And S3, when the real-time thickness difference value measured by the thickness gauge is continuously smaller than the thickness difference fluctuation threshold value for 3 seconds during APC position control, automatically switching the thickness difference control mode from APC position control to monitoring AGC control.
Fig. 6 is a schematic diagram of the rolling speed in this example. Since the rising and falling speed section thickness difference is generally larger than the steady speed section thickness difference, in step S1, the specific method for calculating the thickness difference fluctuation threshold according to the rolling speed state and the rolling thickness is as follows:
when the rolling speed is in the speed increasing section or the speed decreasing section, the thickness difference fluctuation threshold value=the outlet thickness set value h is 3%, and when the rolling speed is in the speed stabilizing section, the thickness difference fluctuation threshold value=the outlet thickness set value h is 2%.
The implementation effect of the device and the method is shown in fig. 7. When the thickness difference signal of the thickness gauge shown at the position A1 in the figure exceeds the allowable fluctuation value, the controller can switch the control mode to APC position control in time, and when the continuous 3 seconds is smaller than the allowable fluctuation value, the controller is automatically switched back to monitor AGC control, the problem of overshoot of the thickness difference at the position B1 in the figure is solved, the problem of overshoot of the thickness difference at the position B in the figure is solved, and the yield is improved.
In this example, the apparatus was implemented in a 1850mm six-roll cold rolling mill. As shown in fig. 1, the cold rolling mill includes an uncoiler 3, a deflection roller 4, a rolling work roller, a plate-type roller 5 and a coiler 6, and is driven by respective motors, and an aluminum strip is uncoiled by the uncoiler 3, rolled by the rolling work roller and then coiled by the coiler 6. The position of the lower working roll 2 can be driven by a hydraulic cylinder 8 to move up and down to control the size of a roll gap, so as to control the thickness of a strip, the hydraulic cylinder 8 is connected with a servo valve 9 through an oil way, and a signal of the servo valve 9 is connected with a monitoring AGC system 10 and an APC system 11 through electric signals. An AGC switch button 15 and an APC switch button 16 are provided in the main console. The thickness gauge 7 is arranged at the outlet side of the cold rolling mill, a thickness gauge signal is connected to the monitoring AGC system through an electric signal, and when the monitoring AGC is adopted for control, the system adjusts the position of the lower working roll through a thickness gauge thickness difference signal to control the thickness of the strip; with APC position control, the system will not be affected by the gauge thickness differential signal and the lower work roll position will remain unchanged. The operator may select the control mode by pressing the AGC button and the APC button, and switch to the monitor AGC control mode when the AGC button is pressed and switch to the APC control mode when the APC button is pressed. As the temperature of the working roll can rise along with the rolling time, if the working roll is rolled by adopting an APC control mode, the roll gap is influenced by expansion caused by heat and contraction caused by cold, so that the strip is thinner and thinner, and the product requirement is not met, the monitoring AGC control mode is generally adopted when the cold rolling mill is rolled, and the thickness of the strip is measured by a thickness gauge and the set thickness form closed-loop control to correct the roll gap reference, so that the thickness of the rolled strip is within the allowable deviation range. When thickness difference fluctuation of the thickness gauge is small, the control mode can basically meet production requirements, however, environmental factors such as oil gas and vibration influence on the thickness gauge are omitted, the measured thickness difference signal fluctuation is large, the monitoring AGC adjusts the roll gap position according to the thickness difference signal fluctuation, when the thickness difference signal fluctuation is large, the monitoring AGC adjusts roll gap force to be increased, and the thickness difference overshoot problem can occur. The overshoot problem causes thinner or thicker strips, affects the quality of products, and even causes breakage of strips when severe.
Because the monitoring AGC program is not opened and the overshoot degree can not be controlled by modifying the program, in order to solve the overshoot problem, the invention adds a controller 12, an electric control switch K1, an electric control switch K2, a relay KA1 13 and a relay KA2 14 on the equipment, the signal of the thickness gauge is sent to the controller through electric connection, the KA1 relay comprises a 24V coil 131 and a normally open contact 132, the KA2 relay comprises a 24V coil 141 and a normally open contact 142, and the switches K1 and K2 are respectively arranged on the power supply lines of the coils 131 and 141 and are controlled by the controller 12.
The normally open contact 132 is in parallel with the normally open contact of the AGC button 15 and the normally open contact 142 is in parallel with the normally open contact of the AGC button 16. The controller 12 is internally preset with a thickness difference fluctuation threshold value, when the controller 12 detects that the thickness difference signal exceeds the fluctuation threshold value, the control switch K2 is closed, the normally open contact 142 is switched on after the coil 141 acts, the rolling mill can automatically select an APC control mode, when the thickness difference signal is monitored for 3 seconds continuously and does not exceed the fluctuation threshold value, the control switch K1 is closed, the normally open contact 132 is switched on after the coil 131 acts, and the system can switch back to the AGC control mode. As the thickness difference signal of the thickness gauge bypasses the monitoring AGC control mode when the thickness difference signal is large, the problem of thickness difference overshoot caused by monitoring AGC is skillfully solved, the yield is improved, and the method is well applied to the field. Moreover, the device has the advantages of simple structure, easy realization and low transformation cost, and is particularly suitable for monitoring the cold rolling mill with the AGC program not opened.
The invention can solve the overshoot problem caused by the large thickness difference signal of the thickness gauge due to the environmental factors and the like, and can also solve the overshoot problem caused by the monitoring of the AGC when the measured thickness difference of the strip exceeds the allowable fluctuation value, thereby minimizing the product loss.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the invention in any way, and any person skilled in the art may make modifications or alterations to the disclosed technical content to the equivalent embodiments. However, any simple modification, equivalent variation and variation of the above embodiments according to the technical substance of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims (7)

1. The method is characterized in that the method is realized based on an aluminum cold rolling mill thickness difference adjusting device, the aluminum cold rolling mill thickness difference adjusting device comprises a rolling working roller, a thickness gauge, a controller, a first relay, a second relay, an AGC system and an APC system, the rolling working roller comprises an upper working roller, a lower working roller and a driving mechanism, the upper working roller and the lower working roller are respectively arranged on the upper side and the lower side of a conveyed aluminum strip, and the lower working roller is arranged on the driving mechanism to move up and down under the driving of the lower working roller so as to adjust the width of a roll gap between the upper working roller and the lower working roller; the AGC system and the APC system are electrically connected with the driving mechanism, the thickness gauge is electrically connected with the AGC system and the controller respectively, the controller controls the coil of the first relay or the coil of the second relay to be electrified, the normally open contact of the first relay is connected with the power supply circuit of the AGC system, and the normally open contact of the second relay is connected with the power supply circuit of the APC system so as to enable the AGC system or the APC system to work when the first relay or the second relay is electrified; the controller respectively controls a first electric control switch on a power supply line of the first relay coil and a second electric control switch on a power supply line of the second relay coil so as to control the second electric control switch or the first electric control switch to be closed according to whether the thickness difference signal exceeds a fluctuation threshold value or not, and then the coil of the second relay or the coil of the first relay is electrified;
the method comprises the following steps:
s1, after an aluminum cold rolling mill starts rolling work, a controller automatically calculates a thickness difference fluctuation threshold according to a rolling state and a rolling thickness;
s2, the controller compares the thickness difference signal measured by the thickness gauge in real time with the thickness difference fluctuation threshold in real time, if the real-time thickness difference value is equal to the thickness difference fluctuation threshold, the coil of the second relay is automatically controlled to be powered on, the power supply circuit of the APC system is connected, the coil of the first relay is simultaneously controlled to be powered off, and the power supply circuit of the AGC system is cut off, so that the thickness difference control mode is switched from the monitoring AGC to the APC position control, otherwise, the monitoring AGC mode is kept;
and S3, when the real-time thickness difference value measured by the thickness gauge is continuously smaller than the thickness difference fluctuation threshold value for n seconds during APC position control, automatically switching the thickness difference control mode from APC position control to monitoring AGC control.
2. The method for adjusting the thickness difference of the aluminum cold-rolling mill with the overshoot prevention function according to claim 1, wherein the first electric control switch and the second electric control switch are provided with interlocking so that the two electric control switches cannot be closed at the same time, and further the coil of the first relay and the coil of the second relay cannot be powered on at the same time.
3. The method for adjusting the thickness difference of the aluminum cold-rolling mill against overshoot according to claim 1, further comprising an AGC switch button and an APC switch button, wherein the AGC switch button is connected in parallel with a normally open contact of the first relay to a power supply line of the AGC system, and the APC switch button is connected in parallel with a normally open contact of the second relay to a power supply line of the APC system to manually select the control mode.
4. The method of claim 3, wherein the AGC switch button and the APC switch button are both time-lapse power-off switches, the AGC switch button is interlocked with the second electric control switch, and the APC switch button is interlocked with the first electric control switch, so that the AGC switch button and the second electric control switch are not simultaneously closed, and the APC switch button and the first electric control switch are not simultaneously closed.
5. The method for adjusting the thickness difference of the aluminum cold-rolling mill with the overshoot prevention function according to claim 1, wherein the upper working roll is rotationally connected with two upper bearing seats on the left side and the right side of the upper working roll, and the two upper bearing seats are fixedly arranged on a frame of the aluminum cold-rolling mill; the lower working roll is rotationally connected with two lower bearing seats on the left side and the right side of the lower working roll, the driving mechanism comprises a left hydraulic cylinder, a right hydraulic cylinder, a left servo valve and a right servo valve, the left lower bearing seat and the right lower bearing seat are respectively arranged on the corresponding hydraulic cylinders so as to drive the lower working roll to lift, and the two servo valves are respectively connected with the corresponding hydraulic cylinders so as to control the hydraulic cylinders to work; the AGC system and the APC system are electrically connected with the two servo valves.
6. The method for adjusting thickness difference of an aluminum cold rolling mill with overshoot prevention according to claim 5, wherein the aluminum cold rolling mill comprises an uncoiler, a deflection roller, a rolling work roller, a plate roller and a coiling machine, and is driven by respective motors, and aluminum strips are uncoiled by the uncoiler, rolled by the rolling work roller and then coiled by the coiling machine.
7. The method for adjusting the thickness difference of the aluminum cold rolling mill against overshoot according to claim 1, wherein in the step S1, the method for calculating the thickness difference fluctuation threshold according to the rolling speed state and the rolling thickness is as follows: when the rolling speed is in the speed increasing section or the speed decreasing section, the thickness difference fluctuation threshold value=the outlet thickness set value h is 3%, and when the rolling speed is in the speed stabilizing section, the thickness difference fluctuation threshold value=the outlet thickness set value h is 2%.
CN202210396965.1A 2022-04-15 2022-04-15 Anti-overshoot aluminum cold rolling mill thickness difference adjusting device and method Active CN114558896B (en)

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