Time-mode intelligent cooling control method for high-speed rolling area

Abstract

A high-speed rolling area time mode intelligent controlled cooling method comprises the steps that a time mode variable point is set on a human-computer interface, and an operator selects to start an intelligent controlled cooling mode; a torque signal of a pre-finishing mill unit is used as a triggering condition, set delay time is combined, and a through-water controlled cooling time starting function is set through a time function block FC20; an automatic cold control starting command interlocked with the water valve opening pulse signal is generated, and self-locking is formed; calculating the actual length of the non-cold section of the head of the rolled piece in the PLC according to the physical layout of each through water cooling water tank; according to the length and the finish rolling outlet linear speed, accurate controlled cooling starting delay time is obtained through calculation and conversion; and parameter setting and monitoring are carried out through an integrated WINCC operation picture. Full-process and self-adaptive time mode intelligent controlled cooling under the high-speed rolling environment is achieved, frequent manual operation is effectively avoided, controlled cooling uniformity and product quality are improved, and meanwhile equipment loss is reduced.

Description

Technical Field

[0001] This invention relates to the field of steel rolling production equipment technology, and in particular to a method for intelligent cooling control in a high-speed rolling zone using a time-mode approach. Background Technology

[0002] In high-speed wire rod rolling production, the post-rolling controlled cooling process has a decisive impact on the microstructure and properties of the wire rod and the product quality. Currently, the controlled cooling process in the high-speed rolling zone of the high-speed wire rod process typically includes five controlled cooling stages: a pre-watering stage and water-passing stages 1 to 4. In actual production, the controlled cooling process mostly relies on manual operation or simple mechanical program control.

[0003] In existing controlled cooling procedures and processes for rolling, manual controlled cooling operations are frequent under fast-paced, high-speed rolling conditions, which cannot meet the controlled cooling requirements of wire rod in such conditions. The requirements for controlled cooling processes, procedures, and on-site controlled cooling equipment in the high-speed zone vary depending on the rolling specifications and steel grades. Existing mechanically controlled cooling processes cannot meet the demands of fast-paced, high-speed rolling and the controlled cooling procedures required. Furthermore, frequent and irregular start-ups and shutdowns of on-site controlled cooling equipment shorten its lifespan, necessitating replacement within its service life and significantly increasing production equipment costs. Simultaneously, frequent and irregular start-ups and shutdowns negatively impact the controlled cooling effect on high-speed wire rod, greatly affecting the quality of the finished wire rod product. Summary of the Invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of this invention is to provide a method for intelligent cooling control in a high-speed rolling zone using a time-mode approach.

[0005] The technical solution adopted by this invention to solve its technical problem is: a method for intelligent cooling control in a high-speed rolling zone using a time-mode approach, comprising the following steps:

[0006] Step 1: Set the time mode variable point of the controlled cooling section of the high-speed zone in the control program, and configure it in the WINCC variable management module of the human-machine interface. The operator can select to enable or disable the time control mode through the check box.

[0007] Step 2: Establish the water cooling control time start-up interlock function. Use the time function block FC20, set the trigger conditions, and combine the water cooling start delay time set on the screen to set the water cooling control time start in the high-speed rolling zone.

[0008] Step 3: Based on the setting signal of the water cooling time start function, generate an automatic opening pulse signal for the cooling water valve of the high-speed zone rolling mill, and interlock it with the centralized control operation signal of the pre-finishing mill and the finishing mill.

[0009] Step 4: According to the length and interval distance of each water cooling water tank in the high-speed rolling area, the actual length of the head cold section of the high-speed rolling area is set and calculated in the PLC;

[0010] Step 5: Based on the actual length of the head cold section and the exit line speed of the finishing mill group, the delay time of the controlled cooling is calculated, and the real-time conversion function block FC62 is converted to an integer time variable;

[0011] Step 6: The opening and closing control of the four groups of tail gas blowing components of the water cooling water tank in the high-speed rolling area is realized, and the power-off delay function block FC21 and the power-on delay function block FC20 are used;

[0012] Step 7: Establish the high-speed rolling area controlled cooling process operation picture, set the cold section distance, set the controlled cooling delay of each section, set the tail gas blowing control and operation mode selection dialog box.

[0013] As a further improvement of the application: in step 1, the variable point is in the form of normally open / variable point in the form of normally closed: the variable point in the form of normally open is embodied in the program interlocking, when the operator checks the check box of the variable point on the main control picture, it represents that the control mode of the variable point has been selected, and it represents that the high-speed area rolling piece controlled cooling section time mode is selected; the variable point in the form of normally closed is embodied in the program interlocking, when the operator does not check the check box of the variable point on the main control picture, it represents that the control mode of the variable point has not been selected, and it represents that the high-speed area rolling piece controlled cooling section time mode is not selected.

[0014] As a further improvement of the application: in step 2, the trigger condition is that the torque of the 17-arch rolling mill of the pre-finishing mill group is greater than or equal to 20% of the actual torque value, which is used as the input start of the time function block.

[0015] As a further improvement of the application: in step 2, the time function block FC20 is also included: the time function block FC20 is programmed in the form of statement table STL in the PLC software control program.

[0016] As a further improvement of the application: in step 3, the automatic opening pulse signal of the high-speed area rolling piece controlled cooling water valve includes a set time range of the high-speed area controlled cooling water valve opening delay time, and a time pulse signal of 10 milliseconds is used to give a high-speed area rolling piece controlled cooling water valve automatic opening pulse signal intermediate variable, and the centralized control operation signal of the high-speed area pre-finishing mill group and the finishing mill group is interlocked to the high-speed area rolling piece controlled cooling water valve automatic opening pulse signal.

[0017] As a further improvement of the application: in step 3, the self-locking command is also included: when a program condition is met and output, the output is maintained through the self-locking program until it is interrupted by the condition.

[0018] As a further improvement of the present application: step 4 further comprises a high-speed rolling zone rolling piece head non-cooling section set length input / output field: according to the picture operation software WINCC picture programming function of the human interface HMI, the "input / output field" control is selected in the picture intelligent control and made to the picture, and the high-speed rolling zone rolling piece head non-cooling section set length signal variable point is established.

[0019] As a further improvement of the present application: step 5 comprises setting the distance from the finishing mill motor outlet to the tail end of the first cooling water tank as S1, the high-speed rolling zone rolling piece head non-cooling section set length as S2, and S1+S2=S3 representing the actual length of the high-speed rolling zone rolling piece head non-cooling section. In the PLC control program, the actual length S3 of the high-speed rolling zone rolling piece head non-cooling section is divided by the finishing mill set outlet line speed V to obtain the rolling time t of the actual length of the high-speed rolling zone rolling piece head non-cooling section, the rolling time t of the actual length of the high-speed rolling zone rolling piece head non-cooling section is converted to integer t1, the rolling time integer t1 of the actual length of the high-speed rolling zone rolling piece head non-cooling section is outputted as an intermediate time variable MD point through the program move function, and the MD time variable point is used as the time setting function variable of the rolling piece cooling opening delay time.

[0020] As a further improvement of the present application: step 6 comprises adding a power-off delay time function block FC21 for cooling tail gas blowing in the PLC interlocking control program, and establishing an intermediate modification variable MD point at the time setting end of the power-off delay time function block FC21, and simultaneously interlocking the on-delay time function block FC20 for cooling tail gas blowing, and establishing another intermediate modification variable MD point at the time setting end of the on-delay time function block FC20.

[0021] As a further improvement of the present application: step 6 further comprises programming the power-off delay time function block FC21 in the form of a statement table STL in the PLC software control program.

[0022] Compared with the prior art, the beneficial effects of the present application are that through repeated tracking and debugging on site, a method of time mode full-process intelligent cooling control of high-speed rolling area is added in the double-high line control system, by establishing a set of automatic time mode full-process intelligent cooling control mode of the cooling equipment in the high-speed rolling area, the time mode automatic cooling process is realized, and the efficient cooling control of high-speed wire rod is ensured. In the complex rolling environment of the high-speed rolling area, the reasonable cooling of the high-speed rolled piece can be realized in order. The purpose of the present application is to realize and improve the defects and deficiencies of the prior art in the high-speed rolling process, avoid frequent manual cooling operation under the working condition of fast-paced high-speed rolling, and meet the cooling requirements of high-speed rolling on wire rod. In the rolling process of different rolling specifications and different steel grades, the process flow and cooling program of high-speed area wire rod cooling and the requirements of on-site cooling equipment are different, which meets the requirements of fast-paced high-speed rolling and cooling process. According to the steel signal of the high-speed area rolling mill and the opening and closing of the time intelligent control cooling valve, the high-speed rolled piece is cooled regularly. The cooling effect and cooling process of the high-speed wire rod in the field production and the cooling operation of the high-speed wire rod are solved, the existing high-speed rolling area wire rod cooling equipment is protected, the quality requirements of high-speed wire rod products are ensured, the cooling process and cooling program of high-speed rolling area wire rod are optimized and improved, and the optimal control of high-speed rolled piece can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor.

[0024] Figure 1 The flowchart of the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely in combination with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0026] It is to be understood that the terms "first", "second", and the like, used in the description and the claims of the present application as well as the above description of the drawings merely refer to structure which is different. They are not to be interpreted in an absolute sense. It is further understood that the use of the terms "include", "includes", "including", "have", "has", "having", or the like, are not limiting of the process, method, system, product, or apparatus to which they refer. They are intended to cover a wide variety of structures or processes that consist of many steps or units which can or can not be specifically recited herein.

[0027] In the production of wire rod, the post-rolling controlled cooling (CC) is a key process step that determines the microstructure, mechanical properties and surface quality of the product. Especially in the high-speed rolling zone, the workpiece temperature drops rapidly and the rolling pace is high, which puts forward very high requirements for the accuracy and response speed of the CC process. At present, the CC process in the high-speed rolling zone in the industry usually includes multiple water cooling sections; however, the existing CC technology generally has the following core technical difficulties, which seriously restricts the further improvement of production efficiency and product quality: the existing CC system mostly adopts simple interlocking control based on a single signal (such as the rolling mill biting steel signal), or relies heavily on manual intervention by operators. Under the conditions of fast pace, multiple specifications and multiple steel grades in high-speed rolling, this control method has a lagging response and is complicated to adjust, and cannot achieve precise timing control that dynamically matches the rolling speed, resulting in a disconnection between the CC process and the actual production requirements. Due to the lack of intelligent collaborative control strategies, the water valves and air valves of each cooling section are frequently started and stopped irregularly. This short-term and impact load greatly exacerbates the mechanical and electrical wear of the actuators, resulting in a high equipment failure rate and a significant reduction in service life, thereby increasing the production and maintenance costs. Unstable valve action and cooling timing can cause uneven cooling of the head and tail of the workpiece, and large fluctuations in the temperature curve. In particular, for the control of the length of the non-cooling section of the head of the workpiece, the existing technology is difficult to achieve accurate calculation and dynamic adjustment, which directly affects the uniformity of the microstructure and the consistency of the performance of the entire wire rod, and the stability of the finished product quality is poor. The existing control system has fixed parameters and poor adjustability, and it is difficult to quickly and flexibly adapt to the process requirements of different steel grades and specifications. At the same time, due to the lack of effective human-machine interface and data processing capability, process personnel cannot visually monitor and optimize the parameters of the CC process, which restricts the continuous improvement of the process level.

[0028] To solve the above problems, the present application provides a method for intelligent CC of time mode in high-speed rolling zone, comprising the following steps:

[0029] Step one: setting of the time mode of the workpiece CC section in the high-speed zone

[0030] In the control program, the setting variable point of the high-speed zone rolling piece control cooling section time mode is established, the variable point is inputted into the variable management module of the human-machine interface WINCC in the form of variable management, and a check box is established in the high-speed control cooling screen for the process operator to select and operate. In the control program, the setting variable point is in the form of constant opening, which indicates the time control mode of the high-speed rolling zone entering the high-speed zone rolling piece control cooling section, and the setting variable point is in the form of constant closing, which indicates the time control mode of the high-speed rolling zone not entering the high-speed zone rolling piece control cooling section. With this control mode, the process control requirements of the high-speed rolling zone control cooling can be flexibly handled.

[0031] Preferably, the variable point in the form of constant opening / variable point in the form of constant closing: the variable point in the form of constant opening is embodied in the program interlocking, when the operator checks the check box of the variable point on the main control screen, it represents that the control mode of the variable point has been selected, which represents that the high-speed zone rolling piece control cooling section time mode is selected; the variable point in the form of constant closing is embodied in the program interlocking, when the operator does not check the check box of the variable point on the main control screen, it represents that the control mode of the variable point is not selected, which represents that the high-speed zone rolling piece control cooling section time mode is not selected.

[0032] Step two: establish the water cooling control cooling time start setting interlocking function

[0033] Firstly, a time function block FC20 is established, which is a start delay function time block. The signal of the 20% of the torque actual value of the pre-finishing mill group 17 mill torque being greater than or equal to the torque actual value is taken as the input start trigger condition signal of the time function block, the picture setting value of the water cooling opening delay is taken as the high-speed zone control cooling water valve opening delay time, the signal interlocking point of the time control mode of the high-speed rolling zone entering the high-speed zone rolling piece control cooling section is interlocked, and on this basis, the high-speed rolling zone water cooling control cooling time start function is set.

[0034] Preferably, the time function block FC20: in the Siemens PLC software control program, the time function block FC20 is programmed in the form of statement table STL to realize the start time delay function, and the FC20 is solidified into a general block function. Only the input start trigger signal point, the setting delay time variable signal point and the enable signal output point need to be replaced, the time function block FC20 can be called in all program blocks, the time function block FC20 is standardized, and it is a convenient and efficient time function block of delay start function.

[0035] Step three: start the automatic control cooling start command of the high-speed rolling zone rolling piece

[0036] The setting signal of the high-speed rolling zone water control cooling time start function in step two is the starting trigger condition, and a time pulse signal of 10 milliseconds is used as the time pulse signal to give a pulse signal intermediate variable of the automatic opening of the high-speed rolling zone rolling piece cooling water valve in the setting time range of the opening delay time of the high-speed zone cooling water valve, the concentrated control operation signal of the high-speed zone pre-finishing mill group and the finishing mill group is interlocked, and the automatic cooling start command of the high-speed rolling zone rolling piece is interlocked to the pulse signal of the automatic opening of the high-speed rolling zone rolling piece cooling water valve, so as to form the self-locking command function of the automatic cooling start command of the high-speed rolling zone rolling piece. The automatic cooling start command of the high-speed rolling zone rolling piece is completed.

[0037] Preferably, the self-locking command function: when a program condition is met and output, through the self-locking program, it can keep output until some conditions break the output. The self-locking of the automatic cooling start command of the high-speed rolling zone rolling piece is interrupted by the pulse signal of the automatic closing of the high-speed zone rolling piece cooling water valve.

[0038] Step four: determining the length of the non-cooling section of the head of the high-speed rolling zone rolling piece according to the actual process production conditions

[0039] According to the length and interval distance of the four water cooling boxes of the high-speed rolling zone cooling section, the PLC control program is set and assigned, the distance from the outlet of the finishing mill motor to the tail end of the cooling No. 1 water box is set and assigned as 15113mm, the distance from the tail end of the cooling No. 1 water box to the tail end of the cooling No. 2 water box is set and assigned as 6260mm, the distance from the tail end of the cooling No. 2 water box to the tail end of the cooling No. 3 water box is set and assigned as 11330mm, and the distance from the tail end of the cooling No. 3 water box to the tail end of the cooling No. 4 water box is set and assigned as 11330mm. The length setting variable signal point of the non-cooling section of the head of the high-speed rolling zone rolling piece is made in the PLC control program, and the non-cooling section setting length input / output domain of the head of the high-speed rolling zone rolling piece is made in the WINCC operation picture, and the setting length input / output domain in the picture is reasonably set according to the actual process production conditions.

[0040] Preferably, the non-cooling section setting length input / output domain of the head of the high-speed rolling zone rolling piece: according to the picture compilation function of the picture operation software WINCC of the human interface HMI, the "input / output domain" control is selected in the picture intelligent control and made to the picture, the non-cooling section setting length signal variable point of the head of the high-speed rolling zone rolling piece is established, and the actual length of the non-cooling section of the head of the high-speed rolling zone rolling piece is accurately determined by setting the accurate value in the actual production process according to the specific conditions.

[0041] Step five: setting the opening delay time of the rolling piece cooling according to the actual length of the non-cooling section of the head of the high-speed rolling zone rolling piece

[0042] According to the implementation function of step four, the distance from the exit of the finishing motor to the tail end of the first cooling water tank is set as S1, the length of the non-cooling section of the head of the workpiece in the high-speed rolling area is set as S2, S1+S2=S3 represents the actual length of the non-cooling section of the head of the workpiece in the high-speed rolling area, in the PLC control program, the actual length of the non-cooling section of the head of the workpiece in the high-speed rolling area S3 is divided by the exit line speed V of the finishing rolling mill to obtain the rolling time t of the actual length of the non-cooling section of the head of the workpiece in the high-speed rolling area, and then the real-to-integer conversion function block FC62 of the PLC control program is used to convert the rolling time t of the actual length of the non-cooling section of the head of the workpiece in the high-speed rolling area into an integer t1. Through the control program setting function, the rolling time integer t1 of the actual length of the non-cooling section of the head of the workpiece in the high-speed rolling area is output as an intermediate time variable MD point through the program move function, and this MD time variable point is used as a time setting function variable of the opening delay of the workpiece cooling to realize the accurate cooling of the workpiece in the high-speed rolling area.

[0043] Preferably, the real-to-integer conversion function block FC62 of the PLC control program: in the Siemens PLC software control program, the real-to-integer conversion function block FC62 is in the form of a statement table STL, realizes the data type function, and FC62 is solidified into a general block function, which only needs to replace the input real-type data to output the corresponding integer-type data, and the data type conversion function block FC62 can be used in all program blocks for data type conversion. The data type conversion function block FC62 is standardized and convenient and efficient to use.

[0044] Step six: realization of the opening and closing functions of the four water-cooled water tank tail gas blowing assemblies in the high-speed rolling area

[0045] In the automatic rolling process, when any one of the four water-cooled water tanks in the high-speed rolling area is selected to be opened, the operation is determined by the process post personnel according to the actual rolling conditions, and then the water valve and the tail gas blowing valve of the selected water nozzle are put into the cooling picture. At this time, a cooling tail gas blowing power-off delay function block FC21 is added in the PLC interlocking control program, and an intermediate modification variable MD point (water-cooled section tail gas blowing closing delay) is established at the time setting end of the power-off delay function block FC21. This variable point is set by the process post personnel according to the actual process production conditions to realize accurate controllability, and at the same time, the interlocking cooling tail gas blowing on-delay function block FC20 is connected, and another intermediate modification variable MD point is established at the time setting end of the on-delay function block FC20. This variable point is also set by the process post personnel according to the actual process production conditions. Through the realization of the opening and closing functions of the four water-cooled water tank tail gas blowing assemblies in the high-speed rolling area, the cooling requirements of the red steel workpiece in the high-speed rolling area are met, and the reasonable deformation and quality requirements of the high-speed wire product are ensured.

[0046] Preferably, the power-off delay time function block FC21: in the Siemens PLC software control program, the power-off delay time function block FC21 is compiled in the form of statement table STL, realizes the power-off time delay function, and FC21 is solidified into a general block function, only needs to replace the input start trigger signal point, sets the delay time variable signal point and enables the signal output point, can call the time function block FC21 in all program blocks, and the time function block FC21 is standardized, which is a convenient and efficient time function block of the power-off delay time function.

[0047] Step seven: the establishment of the human-computer interface WINCC high-speed rolling zone controlled cooling process operation picture setting dialog box

[0048] According to the above steps, the corresponding controlled cooling setting dialog box of the human-computer interface WINCC high-speed rolling zone controlled cooling process operation picture is formulated, such as the high-speed rolling zone controlled cooling water-cooled piece head section non-cooling section distance design dialog box, the four controlled cooling water-cooled section controlled cooling opening delay setting dialog box, the four controlled cooling water-cooled section controlled cooling closing delay setting dialog box, the four controlled cooling water-cooled section tail gas blowing controlled cooling opening delay setting dialog box, the four controlled cooling water-cooled section tail gas blowing controlled cooling power-off delay setting dialog box, the high-speed rolling zone controlled cooling water-cooled section operation mode automatic mode / manual mode selection dialog box and the high-speed rolling zone controlled cooling time mode selection check box. Through the implementation of the above steps, an independent intelligent high-speed rolling zone controlled cooling water-cooled process operation picture can be formulated.

[0049] Preferably, the human-computer interface WINCC: widely used in automatic control and monitoring, industrial data communication and acquisition human-computer interface software, its rich functions and various components meet the needs of the vast industrial technology field, and through real-time tracking and monitoring with the logic programming control software PLC, the production state and various rolling data can be monitored.

[0050] The main functions of the application are:

[0051] The positive effect of the high-speed rolling zone time mode full-process intelligent cooling method is as follows: through repeated tracking and debugging on site, a high-speed rolling zone time mode full-process intelligent cooling method is added in the double high-speed line control system, a set of automatic time mode full-process intelligent cooling mode of the cooling equipment in the high-speed rolling zone is established, the time mode automatic cooling process is realized, and the efficient cooling of the high-speed wire rod is ensured. In the complex rolling environment of the high-speed rolling zone, the reasonable cooling of the high-speed rolled piece can be realized in an orderly manner. The purpose of the present application is to utilize the high-speed rolling zone time mode full-process intelligent cooling method to realize and improve the defects and deficiencies of the existing technology in the high-speed wire rod rolling production process, avoid frequent manual cooling operation under the working condition of fast-paced high-speed rolling, meet the cooling requirements of the wire rod under fast-paced high-speed rolling, and meet the requirements of fast-paced high-speed rolling and the cooling process. In the rolling process of different rolling specifications and different steel grades, the process flow and cooling program of the high-speed zone wire rod cooling and the requirements of the on-site cooling equipment are different, and the requirements of fast-paced high-speed rolling and the cooling process are met. According to the steel signal of the high-speed zone rolling mill and the time intelligent control of the cooling valve, the high-speed rolled piece is cooled regularly. The cooling effect and cooling process of the high-speed wire rod in the on-site production and the cooling operation of the high-speed wire rod are solved, the existing high-speed rolling zone wire rod cooling equipment is protected, the quality requirements of the high-speed wire rod are ensured, the cooling process and cooling program of the high-speed rolling zone wire rod are optimized and improved, and the high-speed rolling zone time mode full-process intelligent cooling method for realizing the optimal control of the high-speed rolled piece can be realized.

[0052] In summary, after reading the present application file, according to the technical scheme and technical concept of the present application, other various corresponding transformation schemes can be made without creative mental labor, which all belong to the scope protected by the present application.

Claims

1. A method for intelligent cooling control in a high-speed rolling zone using a time-mode approach, characterized in that, Includes the following steps: Step 1: Set the time mode variable point of the controlled cooling section of the high-speed zone in the control program, and configure it in the WINCC variable management module of the human-machine interface. The operator can select to enable or disable the time control mode through the check box. Step 2: Establish the water cooling control time start-up interlock function. Use the time function block FC20, set the trigger conditions, and combine the water cooling start delay time set on the screen to set the water cooling control time start in the high-speed rolling zone. Step 3: Based on the setting signal of the water cooling time start function, generate an automatic opening pulse signal for the cooling water valve of the high-speed zone rolling mill, and interlock it with the centralized control operation signal of the pre-finishing mill and the finishing mill. Step 4: Based on the length and spacing of each water-cooling tank in the high-speed rolling zone, set and calculate the actual length of the non-cooled section at the head of the workpiece in the high-speed rolling zone in the PLC. Step 5: Based on the actual length of the non-cooled section at the head and the exit line speed of the finishing mill, calculate the controlled cooling start delay time and convert it into an integer time variable through the solid-to-integer conversion function block FC62; Step 6: Implement the opening and closing control of the tail gas blowing components of the four sets of water cooling tanks in the high-speed rolling zone, using power-off delay function block FC21 and power-on delay function block FC20. Step 7: Establish the high-speed rolling zone controlled cooling process operation screen, set the distance of the non-cooled section, set the controlled cooling delay of each section, set the tail gas blowing control and operation mode selection dialog box.

2. The method for intelligent cooling control in a high-speed rolling zone according to claim 1, characterized in that, Step 1 includes: Variable points in normally open form / Variable points in normally closed form: Variable points in normally open form are reflected in the program interlock. When the operator checks the checkbox for this variable point on the main control screen, it means the control method for this variable point has been selected, representing the selection of the high-speed zone rolled piece controlled cooling time mode. Variable points in normally closed form are reflected in the program interlock. When the operator does not check the checkbox for this variable point on the main control screen, it means the control method for this variable point has not been selected, representing the selection of the high-speed zone rolled piece controlled cooling time mode.

3. The method for intelligent cooling control in a high-speed rolling zone using a time-mode according to claim 1, characterized in that, Step 2 includes: the trigger condition is that the torque of the 17 stands of the pre-finishing mill is greater than or equal to 20% of the actual torque value, which serves as the input start of the time function block.

4. The method for intelligent cooling control in a high-speed rolling zone according to claim 3, characterized in that, Step 2 also includes: Time function block FC20: The time function block FC20 is compiled in the PLC software control program in the form of statement list STL.

5. The method for intelligent cooling control in a high-speed rolling zone using a time-mode according to claim 1, characterized in that, In step 3, the automatic opening pulse signal of the cooling water valve for the high-speed rolling section includes a pulse signal with an intermediate variable of 10 milliseconds as the time pulse signal within the set time range of the opening delay time of the cooling water valve in the high-speed section. This pulse signal is used to automatically open the cooling water valve for the high-speed rolling section. The centralized control operation signals of the high-speed pre-finishing mill and the finishing mill are interlocked, and the automatic cooling start command of the high-speed rolling section is interlocked to the pulse signal of the automatic opening of the cooling water valve for the high-speed rolling section.

6. The method for intelligent cooling control in a high-speed rolling zone using a time-mode according to claim 5, characterized in that, Step 3 also includes: In the self-locking command, when a program condition is met and output is executed, the output is maintained through the self-locking program until it is interrupted by the condition.

7. The method for intelligent cooling control in a high-speed rolling zone using a time-mode according to claim 1, characterized in that, Step 4 also includes the input / output domain for setting the length of the non-cooled section at the head of the workpiece in the high-speed rolling zone: Based on the screen editing function of the WINCC screen control software of the human interface HMI, select the "input / output domain" control in the screen intelligent control and create it on the screen to establish the signal variable point for setting the length of the non-cooled section at the head of the workpiece in the high-speed rolling zone.

8. The method for intelligent cooling control in a high-speed rolling zone using a time-mode according to claim 1, characterized in that, Step 5 includes setting the distance from the outlet of the finishing mill motor to the tail end of the controlled cooling tank No. 1 as S1, and setting the length of the non-cooled section at the head of the workpiece in the high-speed rolling zone as S2. S1+S2=S3 represents the actual length of the non-cooled section at the head of the workpiece in the high-speed rolling zone. In the PLC control program, the actual length S3 of the non-cooled section at the head of the workpiece in the high-speed rolling zone is divided by the linear velocity V at the outlet of the finishing mill to obtain the rolling time t of the actual length of the non-cooled section at the head of the workpiece in the high-speed rolling zone. The real type t of the actual length of the rolling time t of the non-cooled section at the head of the workpiece in the high-speed rolling zone is converted into an integer t1. The integer t1 of the actual length of the rolling time t1 of the non-cooled section at the head of the workpiece in the high-speed rolling zone is output as an intermediate time variable MD point through the program move function. This MD time variable point is used as the time setting function variable for the controlled cooling start delay of the workpiece.

9. The method for intelligent cooling control in a high-speed rolling zone using a time-mode according to claim 1, characterized in that, Step 6 includes adding a power-off delay function block FC21 for controlled cooling exhaust gas blowing to the PLC interlock control program, and establishing an intermediate modification variable MD point at the time setting terminal of the power-off delay function block FC21. At the same time, interlocking the on-off delay function block FC20 for controlled cooling exhaust gas blowing, and establishing another intermediate modification variable MD point at the time setting terminal of the on-off delay function block FC20.

10. The method for intelligent cooling control in a high-speed rolling zone according to claim 9, characterized in that, Step 6 also includes compiling a power-off delay time function block FC21 in the form of a statement list (STL) in the PLC software control program.

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