Rolling mill correction control system and method

Abstract

The present application relates to a kind of mill deviation correction control system and method, mill deviation correction control system includes: light source, for emitting light source to the strip conveyed on mill;Signal detector is correspondingly arranged with light source, signal detector is used to receive to the light source signal after being shielded by strip;Controller is electrically connected with signal detector;Proportional servo valve is electrically connected with controller;Deviation correction cylinder is connected with proportional servo valve, proportional servo valve can control the deviation correction amount of deviation correction cylinder according to control signal;Wherein, first deviation correction amplitude limit value and second deviation correction amplitude limit value are set in controller, second deviation correction amplitude limit value is within the range of first deviation correction amplitude limit value.In the present application, when mill starts rolling strip, the deviation correction amount of controller is limited within second deviation correction amplitude limit value.Avoid the situation that strip is twisted or caused by deviating from center line and is rubbed and is hung equipment to cause strip breakage and fire, and lead to production interruption and equipment damage occur in high-speed rolling process in full oil mill.

Description

Technical Field

[0001] This invention relates to the field of rolling mill equipment technology, and in particular to a rolling mill deviation correction control system and method. Background Technology

[0002] The rolling mill deviation control system is designed to address issues such as uneven strip end faces upon arrival, incorrect strip position during coiling on the rolling mill, or strip misalignment during uncoiling, which can cause the strip to deviate from the rolling centerline. This system aims to prevent product quality problems or damage to production equipment caused by strip misalignment.

[0003] Currently, during the actual rolling process, occasionally a large amount of rolling oil is sprayed onto the correction light source, or foreign objects suddenly block the light source or signal detector, causing position detection signal errors. This results in a large deviation between the controller's calculation of the strip's center position and the actual position, which will drive the correction cylinder to move rapidly in a certain direction until it reaches the adjustment limit, causing the actual center position of the strip to deviate from the rolling center line.

[0004] However, during high-speed rolling on a fully oil-fired rolling mill, large movements of the straightening cylinder can cause strip twisting or scraping against the equipment due to deviation from the center line. This can easily lead to strip breakage and fire, resulting in production interruption and equipment damage.

[0005] In other words, in the existing technology, the straightening cylinder of the rolling mill has a large movement during high-speed rolling, which causes the strip to twist or rub against the equipment due to deviation from the center line. Summary of the Invention

[0006] This invention provides a rolling mill deviation correction control system and method to solve the problem of strip twisting or equipment rubbing due to deviation from the center line caused by large-amplitude movement of the deviation correction cylinder.

[0007] This invention provides a rolling mill deviation correction control system, comprising: a light source for emitting light onto the strip being fed onto the rolling mill; a signal detector corresponding to the light source, the signal detector being used to receive the light source signal after it has been blocked by the strip; a controller electrically connected to the signal detector, the controller being used to receive the light source signal sent by the signal detector and generate a control signal for deviation correction based on the light source signal; a proportional servo valve electrically connected to the controller, used to receive the control signal; and a deviation correction cylinder connected to the proportional servo valve, the proportional servo valve being able to control the deviation correction amount of the deviation correction cylinder according to the control signal, so as to adjust the middle position of the strip to the rolling center line D of the rolling mill; wherein, the controller is configured with a first deviation correction limit value M1 and a second deviation correction limit value M2, the second deviation correction limit value M2 being within the range of the first deviation correction limit value M1; when the rolling mill has not started rolling the strip, the controller limits the deviation correction amount of the deviation correction cylinder within the first deviation correction limit value M1, and when the rolling mill starts rolling the strip, the controller limits the deviation correction amount of the deviation correction cylinder within the second deviation correction limit value M2.

[0008] In one embodiment, the machine correction control system further includes a hydraulic valve platform connected to a proportional servo valve for supplying hydraulic oil to the proportional servo valve.

[0009] In one embodiment, the controller includes a control panel and a control module. The control module is electrically connected to the control panel, the signal detector, and the proportional servo valve. The control panel is used to manually set a first correction limit value M1 and a second correction limit value M2. The control module is used to receive a light source signal sent by the signal detector and generate a control signal for correction based on the light source signal.

[0010] In one implementation, the control module is equipped with at least a manual adjustment mode and an automatic adjustment mode. Before the rolling mill rolls the strip, the control module can call the manual adjustment mode or the automatic adjustment mode to initially adjust the middle position of the strip to near the rolling center line D of the rolling mill.

[0011] In one embodiment, the mill deviation correction control system includes a first proportional servo valve, a second proportional servo valve, a first deviation correction cylinder, and a second deviation correction cylinder. The first proportional servo valve is connected to the first deviation correction cylinder and is used to control the deviation correction of the first deviation correction cylinder. The second proportional servo valve is connected to the second deviation correction cylinder and is used to control the deviation correction of the second deviation correction cylinder. When the control module calls the manual adjustment mode, the first proportional servo valve receives the manual adjustment signal sent by the control module and controls the first deviation correction cylinder to correct the deviation, so as to initially adjust the middle position of the strip to near the rolling center line D of the mill. When the control module calls the automatic adjustment mode, the second proportional servo valve receives the automatic adjustment signal sent by the control module and controls the second deviation correction cylinder to correct the deviation, so as to initially adjust the middle position of the strip to near the rolling center line D of the mill.

[0012] In one implementation, the control panel is further provided with a manual adjustment mode call button and an automatic adjustment mode call button. When the manual adjustment mode call button is pressed manually, the control module calls the manual adjustment mode. When the automatic adjustment mode call button is pressed manually, the control module calls the automatic adjustment mode.

[0013] In one implementation, the range of the first correction limit value M1 is: -300mm M1≤300mm.

[0014] In one implementation, the range of the second correction limiting value M2 is: -25mm M1≤25mm.

[0015] This invention also provides a mill deviation correction control method, which employs the aforementioned mill deviation correction control system and includes the following steps:

[0016] Step S100: Set the first correction limit value M1 and the second correction limit value M2 of the controller;

[0017] Step S200: Initially adjust the middle position of the strip to near the rolling center line D of the rolling mill;

[0018] In step S300, determine whether the rolling mill has started rolling the strip.

[0019] If the rolling mill starts rolling the strip, proceed to the next step;

[0020] In step S400, it is determined whether the current correction amount of the mill's correction cylinder is within the range defined by the second correction limit value M2.

[0021] If the current correction amount is within the range defined by the second correction limit value M2, the correction cylinder will correct the strip according to the current correction amount.

[0022] In one embodiment, in the judgment step S400, if the current correction amount exceeds the range defined by the second correction limit value M2, the controller replaces the current correction amount with the second correction limit value M2, and the correction cylinder corrects the strip according to the two endpoint limits of the second correction limit value M2.

[0023] Compared with the prior art, the advantage of this invention is that, based on the first correction limit value M1, an additional second correction limit value M2 with a smaller range is set. During the rolling process of the strip at the beginning of the rolling mill, the correction amount of the correction cylinder is controlled within this second correction limit value M2. In the actual rolling process, even if unexpected situations occur, such as a large amount of rolling oil being sprayed onto the correction light source, or a sudden foreign object blocking the light source or signal detector, causing an error in the position detection signal, resulting in a large deviation between the controller's calculation of the middle position of the strip 100 and the actual position, i.e., the current correction amount is too large, by setting the second correction limit value M2 and comparing it with the current correction amount, if the range of the current correction amount is greater than the second correction limit value M2, then the current correction amount of the correction cylinder is replaced with the second correction limit value M2. The correction cylinder corrects the strip according to the two extreme values ​​of the two endpoints of the second correction limit value M2, thereby limiting the correction amount of the correction cylinder within the second correction limit value M2. This avoids situations where strip twisting or strip breakage and fires occur during high-speed rolling in a fully oil-operated rolling mill due to excessive movement of the straightening cylinder, or due to strip breakage and rubbing against equipment while deviating from the centerline. This ensures the safe and stable operation of the rolling mill. Attached Figure Description

[0024] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the structural composition of the mill deviation correction control system in Embodiment 1 of the present invention;

[0026] Figure 2 This is a schematic diagram of the module composition of the rolling mill correction control system in Embodiment 1 of the present invention;

[0027] Figure 3 yes Figure 2 Flowchart of the correction cylinder control program set within the central control module;

[0028] Figure 4 This is a flowchart of the mill deviation correction control method in Embodiment 2 of the present invention;

[0029] Figure 5 for Figure 4 The specific method flowchart for step S200 (to be selected by the operator according to the actual situation);

[0030] Figure 6 for Figure 4 The specific method flowchart for step S200 (to be selected by the operator according to the actual situation).

[0031] Figure label:

[0032] 10. Light source; 20. Signal detector; 30. Controller; 31. Control panel; 32. Control module; 40. Proportional servo valve; 50. Correction cylinder; 60. Hydraulic valve platform; 70. Support; 100. Strip; 200. Roll. Detailed Implementation

[0033] The invention will now be further described with reference to the accompanying drawings.

[0034] like Figure 1 and Figure 2As shown, this invention provides a rolling mill deviation correction control system, which includes a light source 10, a signal detector 20, a controller 30, a proportional servo valve 40, and a deviation correction cylinder 50. The light source 10 emits light to the strip 100 being conveyed on the rolling mill; the signal detector 20 is correspondingly arranged to the light source 10 and is used to receive the light source signal after it has been blocked by the strip 100; the controller 30 is electrically connected to the signal detector 20 and is used to receive the light source signal sent by the signal detector 20 and generate a control signal for deviation correction based on the light source signal; the proportional servo valve 40 is electrically connected to the controller 30 and is used to receive the control signal; the deviation correction cylinder 50 is connected to the proportional servo valve 40, and the proportional servo valve 40 can adjust the deviation according to the strip 100's position on the rolling mill. The control signal controls the correction amount of the correction cylinder 50 to adjust the middle position of the strip 100 to the rolling center line D of the rolling mill. The controller 30 is set with a first correction limit value M1 and a second correction limit value M2, and the second correction limit value M2 is within the range of the first correction limit value M1. When the rolling mill has not started rolling the strip 100, the controller 30 limits the correction amount of the correction cylinder 50 to the first correction limit value M1. When the rolling mill starts rolling the strip 100, the controller 30 limits the correction amount of the correction cylinder 50 to the second correction limit value M2.

[0035] In the above settings, based on the first correction limit value M1, an additional second correction limit value M2 with a smaller range is set. During the rolling mill's operation of rolling the strip 100, the correction amount of the correction cylinder 50 is controlled within this second correction limit value M2. In actual rolling, even if unexpected situations occur, such as a large amount of rolling oil spraying onto the correction light source 10, or a sudden foreign object obstructing the light source 10 or signal detector 20, causing position detection signal errors and resulting in a large deviation between the controller 30's calculated middle position of the strip 100 and the actual position (i.e., the current correction amount is too large), by setting the second correction limit value M2 and comparing it with the current correction amount, if the current correction amount's range is greater than the second correction limit value M2, then the current correction amount of the correction cylinder 50 is replaced with the second correction limit value M2. The correction cylinder corrects the strip according to the two endpoint limits of the second correction limit value M2, thereby limiting the correction amount of the correction cylinder 50 within the second correction limit value M2. This avoids situations where, during high-speed rolling on a fully oil-operated rolling mill, the strip could twist 100 degrees due to the large-scale movement of the straightening cylinder, or the strip could break and catch fire due to deviating from the center line, leading to production interruptions and equipment damage. This ensures the safe and stable operation of the rolling mill.

[0036] Specifically, in one embodiment, the range of the first correction limiting value M1 is: -300mm M1≤300mm.

[0037] Specifically, in one embodiment, the range of the second correction limiting value M2 is: -25mm M1≤25mm.

[0038] Specifically, such as Figure 1 As shown, in one embodiment, the machine correction control system further includes a support 70, and signal detectors 20 are disposed on the support 70 and located on the left and right sides of the strip 100. A light source 10 is located above the strip 100 and is disposed between the signal detectors 20 and the rolls 200.

[0039] Specifically, such as Figure 2 As shown, in one embodiment, the machine correction control system further includes a hydraulic valve platform 60, which is connected to a proportional servo valve 40 and is used to supply hydraulic oil to the proportional servo valve 40.

[0040] Specifically, such as Figure 2 As shown, in one embodiment, the controller 30 includes a control panel 31 and a control module 32. The control module 32 is electrically connected to the control panel 31, the signal detector 20, and the proportional servo valve 40. The control panel 31 is used to manually set a first correction limit value M1 and a second correction limit value M2. The control module 32 is used to receive the light source signal sent by the signal detector 20 and generate a control signal for correction based on the light source signal.

[0041] Specifically, such as Figure 3 As shown, in one embodiment, the actual location value ( Figure 3The actual position (from the position sensor of the correction cylinder) is the signal from the mill control system, representing the actual physical position of the correction cylinder. The mill operation signal represents the operating status of the mill; 0 indicates non-operation, and 1 indicates operation. The positive and negative operating limits are the maximum positions the correction cylinder can move in the non-operation state, with a default value of ±300mm. The positive and negative adjustment limits are the maximum positions the correction cylinder can move in the mill operation state, set to ±25mm. When the mill operation signal is 0, the positive and negative operating limits are selected as the positive and negative position limits; when the mill operation signal is 1, the positive and negative adjustment limits are used as the positive and negative position limits. The selected given position is the target position of the correction cylinder, and the corresponding given value is selected according to the state of multiplexers 1, 2, and 3. The gain adjustment is a proportional value that controls the speed of the correction cylinder's movement. The larger the value, the faster the adjustment. When the actual position exceeds the positive or negative limit, the output signal will change from signal 0 to signal 1. When the release control signal is 0, the selector selects IN1 as the input signal, and the output is always 0. When the release signal value is 1, the selector selects IN0, which is the control signal, as the input signal. The output changes according to the magnitude of the control signal. The forward and reverse speed coefficients control the output of the correction cylinder servo valve (proportional servo valve) in both directions, which is equivalent to the gain adjustment. The maximum speed controls the maximum value of the servo valve output. If the maximum value is exceeded, the maximum value will be output. The direction control is used to change the movement direction of the correction cylinder. The movement direction of the correction cylinder can be switched without changing the hydraulic pipeline connection.

[0042] When the mill has not started rolling, the mill operation signal is 0. At this time, the two newly added selectors still use the positive and negative operating limits set on the system panel as the limiting values ​​for the movement distance of the correction cylinder. The movement range of the correction cylinder is still relatively large, which can also ensure that the strip position has a large adjustment range, adjusting the center position of the strip to the rolling center line. In this case, all controls of the correction cylinder are the same as before the modification. After manual or automatic adjustment by threading, the strip has moved to the vicinity of the rolling center line and will enter the rolling stage. At the start of rolling, the mill control system inputs a "train operation ON" signal to the correction control system via a relay. The train operation signal in the correction control system becomes 1. The two newly added selectors will select the positive and negative limits as the positive and negative limit values ​​for the movement distance of the correction cylinder. At this time, regardless of the correction state (manual, automatic, centering), the selected setpoint is controlled by the positive and negative limit values ​​(±25mm). If the movement distance of the correction cylinder exceeds the positive and negative limit values, the setpoint value of the positive and negative limit values ​​will be output as the setpoint value. Even if an error is detected, the correction cylinder can only move within the adjustment range of the positive and negative limit values.

[0043] Specifically, in one embodiment, the control module 32 is equipped with at least a manual adjustment mode and an automatic adjustment mode. Before the rolling mill rolls the strip 100, the control module 32 can call the manual adjustment mode or the automatic adjustment mode to initially adjust the middle position of the strip 100 to near the rolling center line D of the rolling mill.

[0044] Specifically, in one embodiment, the mill deviation correction control system includes a first proportional servo valve, a second proportional servo valve, a first deviation correction cylinder, and a second deviation correction cylinder. The first proportional servo valve is connected to the first deviation correction cylinder and is used to control the deviation correction of the first deviation correction cylinder. The second proportional servo valve is connected to the second deviation correction cylinder and is used to control the deviation correction of the second deviation correction cylinder. When the control module 32 calls the manual adjustment mode, the first proportional servo valve receives the manual adjustment signal sent by the control module 32 and controls the first deviation correction cylinder to correct the deviation, so as to initially adjust the middle position of the strip 100 to near the rolling center line D of the mill. When the control module 32 calls the automatic adjustment mode, the second proportional servo valve receives the automatic adjustment signal sent by the control module 32 and controls the second deviation correction cylinder to correct the deviation, so as to initially adjust the middle position of the strip 100 to near the rolling center line D of the mill.

[0045] Specifically, in one embodiment, the control panel 31 is further provided with a manual adjustment mode call button and an automatic adjustment mode call button. When the manual adjustment mode call button is pressed manually, the control module 32 calls the manual adjustment mode. When the automatic adjustment mode call button is pressed manually, the control module 32 calls the automatic adjustment mode. Example

[0046] like Figure 4 As shown, the present invention also provides a mill deviation correction control method, which employs the mill deviation correction control system of any one of claims 1 to 8, and includes the following steps:

[0047] Step S100: Set the first correction limit value M1 and the second correction limit value M2 of the controller;

[0048] Step S200: Initially adjust the middle position of the strip to near the rolling center line D of the rolling mill;

[0049] In step S300, determine whether the rolling mill has started rolling the strip.

[0050] If the rolling mill starts rolling the strip, proceed to the next step;

[0051] In step S400, it is determined whether the current correction amount of the mill's correction cylinder is within the range defined by the second correction limit value M2.

[0052] If the current correction amount is within the range defined by the second correction limit value M2, the correction cylinder will correct the strip according to the current correction amount.

[0053] Specifically, such as Figure 1 As shown, in one embodiment, if the current correction amount exceeds the range defined by the second correction limit value M2, the controller replaces the current correction amount with the second correction limit value M2, and the correction cylinder corrects the strip according to the two endpoint limits of the second correction limit value M2.

[0054] Specifically, such as Figure 1 As shown, in one embodiment, in the determination step S300, if the rolling mill has not started rolling the strip, then the process proceeds to the determination step S500:

[0055] Determine whether the current correction amount of the mill's correction cylinder is within the range defined by the first correction limit value M1;

[0056] If the current correction amount is within the range defined by the first correction limit value M1, the correction cylinder will correct the strip according to the current correction amount.

[0057] If the current correction amount exceeds the range defined by the first correction limit value M1, the controller replaces the current correction amount with the first correction limit value M1, and the correction cylinder corrects the strip according to the two extreme values ​​of the first correction limit value M1.

[0058] Specifically, such as Figure 5 As shown, in one embodiment, step S200 specifically includes the following steps:

[0059] Step S201: Manually press the manual adjustment mode activation button;

[0060] In step S202, the control module calls the manual adjustment mode and sends a manual adjustment signal to the first proportional servo valve;

[0061] Step S203: The first proportional servo valve receives the manual adjustment signal sent by the control module to control the first correction cylinder to correct the deviation.

[0062] Step S204: Initially adjust the middle position of the strip to be near the rolling center line D of the rolling mill.

[0063] Specifically, such as Figure 6 As shown, in one embodiment, step S200 specifically includes the following steps:

[0064] Step S205: Manually press the button to activate the automatic adjustment mode;

[0065] Step S206: The control module calls the automatic adjustment mode and sends an automatic adjustment signal to the second proportional servo valve;

[0066] Step S207: The second proportional servo valve receives the manual adjustment signal sent by the control module to control the second correction cylinder to correct the deviation.

[0067] Step S208: Initially adjust the middle position of the strip to be near the rolling center line D of the rolling mill.

[0068] It should be noted that steps S201 to S204 are not sequential to steps S205 to S206. They are independent control steps and require the operator to choose one of them based on the actual situation.

[0069] It should be noted that, before normal rolling, the strip position in this invention is adjusted manually by the operator or automatically by the correction system to ensure that the center position of the strip 100 is basically near the rolling centerline. Since the misalignment of the strip 100 is also small, the adjustment of the correction cylinder during normal rolling is only within a very small range. Furthermore, the self-protection function of the correction system can automatically shut down the correction adjustment function when the correction light source or signal detection malfunctions (existing technologies will not be elaborated here), keeping the correction cylinder 50 in its current position to avoid unexpected situations.

[0070] However, in situations where a large amount of rolling oil is sprayed onto the correction light source, or when a foreign object suddenly blocks the light source 10 or the signal detector 20, the strip position received by the correction system is incorrect and no longer corresponds to the actual position. At this point, no matter how the correction cylinder 50 adjusts, it cannot make the middle position of the strip coincide with the rolling centerline. The continued positional deviation causes the correction cylinder 50 to move rapidly and significantly, leading to strip breakage and fire. Through analysis of the correction system's principle and observation of actual operation, the inventors found that the adjustment range of the correction cylinder 50 is large before rolling but small during rolling. To ensure normal correction adjustment and safety requirements under abnormal detection conditions, an operating limit value (setting a second correction limit value M2) was added to the original correction control system as an additional adjustment range limit for the correction cylinder. The operating limit value is derived from statistical data on edge misalignment of the incoming material and empirical data on the actual operating range of the correction cylinder, generally within ±25mm, and is used to limit the adjustment range of the correction cylinder during normal rolling. The selection of the operating limit value is achieved by adding a multiplexer within the controller 30. The control signal of the multiplexer comes from the mill operating status signal, and a specific limit value is selected based on the mill operating status (either the first correction limit value M1 or the second correction limit value M2). This control method utilizes the newly added operating limit value to control the correction cylinder 50 to adjust only within a small range during the rolling process. Even if an abnormal signal is detected during rolling, the adjustment of the correction cylinder 50 remains within a controllable range, preventing strip breakage and fires caused by large adjustments. An alarm signal is also sent to the operator to promptly stop the machine and address the abnormality.

[0071] It should be noted that the above-mentioned mill correction control method selects different correction cylinder movement limits according to different mill operating states (the first correction limit value M1 is selected when the mill has not started rolling strip, and the second correction limit value M2 is selected when the mill starts rolling strip). This can meet the large-scale adjustment of strip when not rolling, meet the adjustment needs of correction cylinder during normal rolling, and ensure that the adjustment of correction cylinder will not lead to safety accidents when abnormalities occur. Thus, it achieves the function of having a large adjustment space in the non-rolling state and controllable adjustment range during the rolling process.

[0072] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A rolling mill deviation correction control system, characterized in that, It includes: A light source, used to emit light onto the strip being conveyed on the rolling mill; as well as A signal detector is provided corresponding to the light source, and the signal detector is used to receive the light source signal after it has been blocked by the strip. as well as A controller, electrically connected to the signal detector, is used to receive the light source signal sent by the signal detector and generate a control signal for correction based on the light source signal. as well as A proportional servo valve, electrically connected to the controller, is used to receive the control signal; as well as The correction cylinder is connected to the proportional servo valve, which can control the correction amount of the correction cylinder according to the control signal to adjust the middle position of the strip to the rolling center line D of the rolling mill. The controller is configured with a first correction limit value M1 and a second correction limit value M2, wherein the second correction limit value M2 is within the range of the first correction limit value M1. When the rolling mill has not started rolling the strip, the controller limits the correction amount of the correction cylinder to within the first correction limit value M1. When the rolling mill starts rolling the strip, the controller limits the correction amount of the correction cylinder to within the second correction limit value M2.

2. The mill deviation correction control system according to claim 1, characterized in that, The machine correction control system also includes a hydraulic valve platform, which is connected to the proportional servo valve and is used to supply hydraulic oil to the proportional servo valve.

3. The mill deviation correction control system according to claim 1, characterized in that, The controller includes a control panel and a control module. The control module is electrically connected to the control panel, the signal detector, and the proportional servo valve. The control panel is used to manually set the first correction limit value M1 and the second correction limit value M2. The control module is used to receive the light source signal sent by the signal detector and generate a control signal for correction based on the light source signal.

4. The mill deviation correction control system according to claim 3, characterized in that, The control module is equipped with at least a manual adjustment mode and an automatic adjustment mode. Before the rolling mill rolls the strip, the control module can call the manual adjustment mode or the automatic adjustment mode to initially adjust the middle position of the strip to be near the rolling center line D of the rolling mill.

5. The mill deviation correction control system according to claim 4, characterized in that, The mill deviation correction control system includes a first proportional servo valve, a second proportional servo valve, a first deviation correction cylinder, and a second deviation correction cylinder. The first proportional servo valve is connected to the first deviation correction cylinder and is used to control the deviation correction of the first deviation correction cylinder. The second proportional servo valve is connected to the second deviation correction cylinder and is used to control the deviation correction of the second deviation correction cylinder. When the control module calls the manual adjustment mode, the first proportional servo valve receives the manual adjustment signal sent by the control module and controls the first deviation correction cylinder to initially adjust the middle position of the strip to near the rolling center line D of the mill. When the control module calls the automatic adjustment mode, the second proportional servo valve receives the automatic adjustment signal sent by the control module and controls the second deviation correction cylinder to initially adjust the middle position of the strip to near the rolling center line D of the mill.

6. The mill deviation correction control system according to claim 4, characterized in that, The control panel is also equipped with a manual adjustment mode call button and an automatic adjustment mode call button. When the manual adjustment mode call button is pressed manually, the control module activates the manual adjustment mode. When the automatic adjustment mode call button is pressed manually, the control module activates the automatic adjustment mode.

7. The mill deviation correction control system according to any one of claims 1 to 6, characterized in that, The range of the first correction limit value M1 is: -300mm M1≤300mm.

8. The mill deviation correction control system according to any one of claims 1 to 6, characterized in that, The range of the second correction limit value M2 is: -25mm M1≤25mm.

9. A rolling mill deviation correction control method, characterized in that, The mill deviation correction control method adopts the mill deviation correction control system according to any one of claims 1 to 8, and includes the following steps: Step S100: Set the first correction limit value M1 and the second correction limit value M2 of the controller; Step S200: Initially adjust the middle position of the strip to near the rolling center line D of the rolling mill; In step S300, it is determined whether the rolling mill has started rolling the strip. If the rolling mill begins rolling the strip, proceed to the next step; In the judgment step S400, it is determined whether the current correction amount of the correction cylinder of the rolling mill is within the range defined by the second correction limit value M2. If the current correction amount is within the range defined by the second correction limit value M2, then the correction cylinder corrects the strip according to the current correction amount.

10. The mill deviation correction control method according to claim 9, characterized in that, In the judgment step S400, if the current correction amount exceeds the range defined by the second correction limit value M2, the controller replaces the current correction amount with the second correction limit value M2, and the correction cylinder corrects the strip according to the two endpoint limits of the second correction limit value M2.

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