Thickness gauge shutter opening time sequence control method and system

Abstract

The invention provides a thickness gauge shutter opening time sequence control method and system. The method comprises the steps that the preset rolling speed of each finishing mill frame is obtained; determining a delay control strategy for opening a shutter of the thickness gauge according to a preset rolling speed of a finish rolling tail rack so as to reduce the time difference between the time when the head of the strip steel enters a measuring area of the thickness gauge and the shutter opening time; wherein the delay control strategy is determined based on the preset rolling speed of each finishing mill frame, the forward slip value of the corresponding finishing mill frame and the distance between the corresponding finishing mill frame and the measurement area. The method effectively solves the problem that the shutter of the thickness gauge is opened 1-2 s ahead of time, solves the problem that the control logic and the time sequence of the shutter of the existing thickness gauge are unreasonable, and after the method is implemented, the opening time point of the shutter of the thickness gauge is closer to the time point when the head of the strip steel reaches the shutter of the thickness gauge; the problem that the strip steel head thickness feedback control precision and the thickness self-learning accuracy are affected due to inaccurate actually measured strip steel thickness deviation after an existing thickness gauge shutter is opened in advance is effectively solved.

Description

Technical Field

[0001] The invention relates to the application field of steel production, and in particular to a thickness gauge shutter opening timing control method and system. Background Art

[0002] A thickness gauge is often installed behind the finishing F7 stand of the hot rolling production line to detect the strip thickness in real time and feed it back to the control system for thickness control adjustment. A thickness gauge is installed behind the finishing F7 stand of the hot coil production line of the rolling mill, 4.17 meters away from the center line of the finishing F7 stand, and uses X-rays to detect the real-time thickness of the strip. The existing thickness gauge X-ray shutter opening command is given by the primary control system. In the actual production process, due to the simple control logic and method of the existing thickness gauge shutter opening, the thickness gauge shutter is often opened 1-2s in advance. When the thickness gauge shutter is opened but the actual strip is not detected, the thickness deviation fed back by the thickness gauge is -500um, which causes the control system to avoid this section during thickness self-learning, affecting the thickness feedback control accuracy of the strip head and the thickness self-learning accuracy. Summary of the invention

[0003] In view of the above problems existing in the prior art, the present invention proposes a thickness gauge shutter opening timing control method and system, which mainly solves the problem that the shutter of the existing thickness gauge usually opens about 1-2s in advance, resulting in large deviation in strip thickness detection and thus affecting the strip head thickness feedback control and thickness self-learning.

[0004] In order to achieve the above purpose and other purposes, the technical solution adopted by the present invention is as follows.

[0005] The present application provides a method for controlling the timing of opening a shutter of a thickness gauge, comprising: obtaining a preset rolling speed of each finishing mill stand; determining a delay control strategy for opening the shutter of the thickness gauge according to the preset rolling speed of the final finishing mill stand, so as to reduce the time difference between the time when the head of the strip enters the measuring area of ​​the thickness gauge and the shutter opening time; wherein the delay control strategy is determined based on the preset rolling speed of each finishing mill stand, the forward slip value of the corresponding finishing mill stand, and the distance between the corresponding finishing mill stand and the measuring area.

[0006] In one embodiment of the present application, the steps of determining the delay control strategy for opening the thickness gauge shutter according to the preset rolling speed of the final finishing stand include: recording the preset rolling speed of the final finishing stand as the first speed; comparing the first speed with a preset speed threshold to determine the speed range in which the first speed falls; and calling a pre-associated delay control strategy according to the speed range to calculate the thickness gauge shutter opening delay.

[0007] In one embodiment of the present application, when the first speed is greater than or equal to 9 m / s, the calculation method of the shutter opening delay of the thickness gauge includes:

[0008]

[0009] Among them, T 1 : Delay time for the shutter of the thickness gauge to open after the F5 frame bites the steel; L1: The distance between the center line of the F5 frame and the shutter of the thickness gauge; V 5 : F5 stand preset rolling speed; V 6 : F6 stand preset rolling speed; V 7 : Preset rolling speed of F7 frame; slip5: forward slip value of F5 frame; slip6: forward slip value of F6 frame; slip7: forward slip value of F7 frame.

[0010] In one embodiment of the present application, when the first speed is greater than or equal to 4.5 m / s and less than 9 m / s, the calculation method of the shutter opening delay of the thickness gauge includes:

[0011]

[0012] Among them, T 2 : Delay time for the shutter of the thickness gauge to open after the F6 frame bites the steel; L2: The distance between the center line of the F6 frame and the shutter of the thickness gauge; V 6 : F6 stand preset rolling speed; V 7 : Preset rolling speed of F7 frame; slip6: forward slip value of F6 frame; slip7: forward slip value of F7 frame.

[0013] In one embodiment of the present application, when the first speed is less than 4.5 m / s, the calculation method of the shutter opening delay of the thickness gauge includes:

[0014]

[0015] Among them, T 3 : Delay time for the shutter of the thickness gauge to open after the F7 frame bites the steel; L3: The distance between the center line of the F7 frame and the shutter of the thickness gauge; V 7 : Preset rolling speed of F7 stand; slip7: forward slip value of F7 stand.

[0016] The present application also provides a thickness gauge shutter opening timing control system, comprising: a data acquisition module, used to obtain the preset rolling speed of each finishing mill stand; a shutter delay control module, used to determine the delay control strategy of the thickness gauge shutter according to the preset rolling speed of the final finishing mill stand, so as to reduce the time difference between the time when the strip head enters the thickness gauge measurement area and the shutter opening time; wherein the delay control strategy is determined based on the preset rolling speed of each finishing mill stand, the forward slip value of the corresponding finishing mill stand, and the distance between the corresponding finishing mill stand and the measurement area.

[0017] As described above, the present application proposes a method and system for controlling the timing of shutter opening of a thickness gauge, which has the following beneficial effects.

[0018] The present application calculates the time it takes for the steel strip to reach the measuring area of ​​the thickness gauge based on the preset rolling speeds of each stand before the final stand of the finishing rolling mill, and then determines the shutter opening time of the thickness gauge according to the calculated time, so as to avoid the thickness detection of the steel strip being affected by the premature opening of the shutter of the thickness gauge, thereby improving the thickness control accuracy of the head and the entire length of the steel strip, avoiding the repeated occurrence of scrap steel accidents caused by abnormal thickness feedback control, and improving the threading stability of the head of the finishing rolled strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the flow of a method for controlling the timing of shutter opening of a thickness gauge in one embodiment of the present application.

[0020] Figure 2 This is a module diagram of a thickness gauge shutter opening timing control system in one embodiment of the present application. DETAILED DESCRIPTION

[0021] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0022] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0023] The inventors have found that:

[0024] The existing shutter opening control logic of the finishing thickness gauge is simple, which is: F7 preset rolling speed ≥ 9m / s, the finishing F5 frame bites steel, and the thickness gauge shutter opens; 4.5m / s≤F7 preset rolling speed <9m / s, the finishing F6 frame bites steel, and the thickness gauge shutter opens; F7 preset rolling speed <4.5m / s, the finishing F7 frame bites steel, and the thickness gauge shutter opens; the existing control technology simply determines the F7 preset rolling speed through the rear frame bite steel signal to control the thickness gauge shutter to open, resulting in all specifications of thickness gauge shutters opening 1-2s in advance, inaccurate control timing, and unreasonable control logic.

[0025] When the shutter of the thickness gauge opens in advance and fails to detect the actual strip, the thickness deviation fed back to the control system is -500um, which affects the thickness feedback control accuracy and thickness self-learning accuracy of the strip head, and also affects the threading stability of the finished strip head.

[0026] Based on the above problems existing in the prior art, the present application proposes a method and system for controlling the timing of shutter opening of a thickness gauge. The technical solution of the present application is described in detail below in conjunction with specific embodiments.

[0027] See also Figure 1 , Figure 1 The flowchart of the method for controlling the timing of opening the shutter of a thickness gauge in one embodiment of the present application is as follows. The method provided in the embodiment of the present application includes:

[0028] Step S100, obtaining the preset rolling speed of each finishing rolling stand.

[0029] In one embodiment, the rolling speed of each finishing mill stand can be preset, and during the finishing rolling process, each finishing mill stand is rolled at the preset rolling speed. The preset rolling speeds of different finishing mill stands can be different, and can be set and adjusted according to actual application requirements, which is not limited here. When performing the timing control of the thickness gauge shutter opening, the preset rolling speed of the corresponding finishing mill stand can be read, so as to calculate the time for the head of the strip to pass through the corresponding finishing mill stand and reach the thickness gauge measurement area based on the corresponding preset rolling speed.

[0030] Step S110, determining the delay control strategy for opening the shutter of the thickness gauge according to the preset rolling speed of the final finishing stand, so as to reduce the time difference between the time when the head of the strip enters the measuring area of ​​the thickness gauge and the time when the shutter is opened; wherein the delay control strategy is determined based on the preset rolling speed of each finishing stand, the forward slip value of the corresponding finishing stand, and the distance between the corresponding finishing stand and the measuring area. The forward slip value of the speed of the corresponding stand can be calculated according to the forward slip value of the finishing stand and the rolling speed of the corresponding finishing stand. When calculating the opening time of the shutter of the thickness gauge, the forward slip value of the corresponding finishing stand is fully considered to improve the calculation accuracy of the opening time. The finishing mill group is usually provided with seven finishing stands F1-F7, and F7 is used as the final finishing stand.

[0031] In one embodiment, the step of determining the delay control strategy for opening the shutter of the thickness gauge according to the preset rolling speed of the final stand of the finishing rolling mill includes: recording the preset rolling speed of the final stand of the finishing rolling mill as the first speed; comparing the first speed with the preset speed threshold to determine the speed interval in which the first speed falls; calling the pre-associated delay control strategy according to the speed interval to calculate the thickness gauge shutter opening delay. Specifically, delay control strategies associated with different speed intervals can be pre-set, and the endpoints of the speed interval are compared with the first speed as the threshold, so as to determine which speed interval the first speed falls into. Call the corresponding delay control strategy according to the speed interval in which the first speed falls. The delay control strategy is mainly used to calculate the time from the strip to the measurement area of ​​the thickness gauge, and use this time as the delay to determine the thickness gauge shutter opening delay. Since the calculation starting point of the delay is different in different speed intervals, different delay control strategies need to be set accordingly.

[0032] In one embodiment, when the first speed is greater than or equal to 9 m / s, the method for calculating the shutter opening delay of the thickness gauge includes:

[0033]

[0034] Among them, T 1 : Delay time for the shutter of the thickness gauge to open after the F5 frame bites the steel (i.e., how many seconds does it take for the shutter of the thickness gauge to open after the F5 frame bites the steel); L1: The distance from the center line of the F5 frame to the shutter of the thickness gauge, illustratively, is 15.17 meters; V 5 : F5 stand preset rolling speed; V 6 : F6 stand preset rolling speed; V 7 : Preset rolling speed of F7 frame; slip5: forward slip value of F5 frame (the strip rolling speed is faster than the frame roll speed, which is a positive value); slip6: forward slip value of F6 frame; slip7: forward slip value of F7 frame.

[0035] When the preset rolling speed of F7 is greater than or equal to 9m / s, when the F1 stand bites the steel, the thickness gauge shutter opening time point calculation is started, and the delay time T is set after the F5 stand bites the steel. 1 After one second, the control system sends a shutter opening command to the thickness gauge to control the shutter of the thickness gauge to open.

[0036] In one embodiment, when the first speed is greater than or equal to 4.5 m / s and less than 9 m / s, the method for calculating the shutter opening delay of the thickness gauge includes:

[0037]

[0038] Among them, T 2: Delay time for the shutter of the thickness gauge to open after the F6 frame bites the steel (i.e., how many seconds does it take for the shutter of the thickness gauge to open after the F6 frame bites the steel); L2: The distance from the center line of the F6 frame to the shutter of the thickness gauge, illustratively, is 9.67 meters; V 6 : F6 stand preset rolling speed; V 7 : Preset rolling speed of F7 frame; slip6: forward slip value of F6 frame (the strip rolling speed is faster than the frame roll speed, which is a positive value); slip7: forward slip value of F7 frame.

[0039] When the preset rolling speed of F7 is greater than or equal to 4.5m / s and less than 9m / s, when the F1 stand bites the steel, the thickness gauge shutter opening time point calculation is started, and the delay time T after the F6 stand bites the steel 2 After one second, the control system sends a shutter opening command to the thickness gauge to control the shutter of the thickness gauge to open.

[0040] In one embodiment, when the first speed is less than 4.5 m / s, the method for calculating the shutter opening delay of the thickness gauge includes:

[0041]

[0042] Among them, T 3 : Delay time for the shutter of the thickness gauge to open after the F7 frame bites the steel (i.e., how many seconds does it take for the shutter of the thickness gauge to open after the F7 frame bites the steel); L3: The distance from the center line of the F7 frame to the shutter of the thickness gauge, illustratively, is 4.17 meters; V 7 : Preset rolling speed of F7 frame; slip7: forward slip value of F7 frame (the strip rolling speed is faster than the frame roll speed and is a positive value).

[0043] Based on the above technical solution of the present application, the problem that the shutter of the existing thickness gauge opens 1-2s in advance is effectively solved, and the problem that the shutter opening time control logic and control timing of the existing thickness gauge are unreasonable is solved. After the control method is implemented, the opening time point of the thickness gauge shutter is closer to the time point when the strip head arrives at the thickness gauge shutter; it effectively solves the problem that the existing thickness gauge shutter is opened in advance, resulting in inaccurate deviation of the measured strip thickness, affecting the accuracy of the strip head thickness feedback control and thickness self-learning, and affecting the stability of the finished strip head threading.

[0044] See also Figure 2 , Figure 2This is a block diagram of a thickness gauge shutter opening timing control system in an embodiment of the present application. The system includes: a data acquisition module, used to obtain the preset rolling speed of each finishing stand; a shutter delay control module, used to determine the delay control strategy for the thickness gauge shutter opening according to the preset rolling speed of the final finishing stand, so as to reduce the time difference between the time when the strip head enters the thickness gauge measurement area and the shutter opening time; wherein the delay control strategy is determined based on the preset rolling speed of each finishing stand, the forward slip value of the corresponding finishing stand, and the distance between the corresponding finishing stand and the measurement area.

[0045] The execution process of the specific system has been described in detail in the aforementioned method embodiment and will not be repeated here.

[0046] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for controlling the timing of shutter opening of a thickness gauge, characterized in that: include: Obtaining the preset rolling speed of each finishing mill stand; A delay control strategy for opening the shutter of the thickness gauge is determined according to the preset rolling speed of the final finishing stand to reduce the time difference between the time when the head of the strip enters the measuring area of ​​the thickness gauge and the shutter opening time; wherein the delay control strategy is determined based on the preset rolling speed of each finishing stand, the forward slip value of the corresponding finishing stand, and the distance between the corresponding finishing stand and the measuring area.

2. The method for controlling the timing of shutter opening of a thickness gauge according to claim 1, characterized in that: The steps of determining the delay control strategy for opening the shutter of the thickness gauge according to the preset rolling speed of the final stand of the finishing rolling mill include: The preset rolling speed of the final finishing stand is recorded as the first speed; comparing the first speed with a preset speed threshold to determine a speed interval into which the first speed falls; A pre-associated delay control strategy is called according to the speed interval to calculate the thickness gauge shutter opening delay.

3. The method for controlling the timing of shutter opening of a thickness gauge according to claim 1, characterized in that: When the first speed is greater than or equal to 9 m / s, the calculation method of the shutter opening delay of the thickness gauge includes: Among them, T1: delay time for the shutter of the thickness gauge to open after the F5 frame bites the steel; L1: the distance between the center line of the F5 frame and the shutter of the thickness gauge; V5: preset rolling speed of the F5 frame; V6: preset rolling speed of the F6 frame; V7: preset rolling speed of the F7 frame; slip5: forward slip value of the F5 frame; slip6: forward slip value of the F6 frame; slip7: forward slip value of the F7 frame.

4. The method for controlling the timing of shutter opening of a thickness gauge according to claim 1, characterized in that: When the first speed is greater than or equal to 4.5 m / s and less than 9 m / s, the calculation method of the shutter opening delay of the thickness gauge includes: Among them, T2: delay time for the shutter of the thickness gauge to open after the F6 frame bites the steel; L2: the distance between the center line of the F6 frame and the shutter of the thickness gauge; V6: the preset rolling speed of the F6 frame; V7: the preset rolling speed of the F7 frame; slip6: the forward slip value of the F6 frame; slip7: the forward slip value of the F7 frame.

5. The method for controlling the timing of shutter opening of a thickness gauge according to claim 1, characterized in that: When the first speed is less than 4.5 m / s, the calculation method of the shutter opening delay of the thickness gauge includes: Among them, T3: delay time for the shutter of the thickness gauge to open after the F7 frame bites the steel; L3: distance between the center line of the F7 frame and the shutter of the thickness gauge; V7: preset rolling speed of the F7 frame; slip7: forward slip value of the F7 frame.

6. A thickness gauge shutter opening timing control system, characterized in that: include: A data acquisition module, used to obtain the preset rolling speed of each finishing mill stand; A shutter delay control module is used to determine the delay control strategy for opening the shutter of the thickness gauge according to the preset rolling speed of the final finishing stand, so as to reduce the time difference between the time when the strip head enters the measuring area of ​​the thickness gauge and the shutter opening time; wherein the delay control strategy is determined based on the preset rolling speed of each finishing stand, the forward slip value of the corresponding finishing stand, and the distance between the corresponding finishing stand and the measuring area.

Images