2250mm Hot Continuous Rolling Main Rolling Line
Abstract : This paper introduces the process equipment composition and technical characteristics of the 2250mm hot continuous rolling production line, the composition of the automatic control system, and focuses on the system configuration and application functions of the L1 basic automatic control system and the L2 process automatic control system of the main rolling line.
Key words: 2250mm hot continuous rolling production line of a domestic iron and steel company has complete equipment configuration and control measures, and the rolling mill has a large rolling capacity. It mainly produces steel for automobiles, structural steel for ship hulls, and structural steel with high weather resistance. It produces hot-rolled double High value-added products such as phase steel (DP ) , multiphase steel ( MP) , phase transformation induced plasticity steel ( TRIP ) and high-strength pipeline steel. The main features of the products focus on high strength, high precision, high surface quality and thin gauge. The production scale is 4.5 million tons of hot-rolled steel coils per year.
The hot rolling production line automation system consists of L1 level, L2 level and MES system. The system configuration is reasonable, complete, reliable, practical and advanced. The automatic control system of the main rolling line adopts the latest hardware products and supporting system software from TMEIC; it adopts a mature and advanced process control mathematical model, and has the world's advanced automatic control technology ; 1. The connection between each subsystem is smooth and seamless, which is conducive to software development and system maintenance; the hardware and software of the automation control system adopt common standards, technologies and protocols in the industry, which is convenient for system expansion or upgrade.
- Composition and main technical characteristics of process equipment
1.1 Composition of process equipment
The 2 2 5 0mm hot-rolled strip steel production line consists of main equipment (as shown in Figure 1 ).
(1) walking beam type heating furnace (RHF1 ～ RHF4) ; (2) Rough rolling descaling device (HSB) ; (3) fixed width press (SSP) ; (4) Four-high reversible roughing mill ( E1/R1) with attached vertical rolls ; (5) Four-high reversible roughing mill (E2/R2) with attached vertical rolls ; ⑹ intermediate heater (EH) ; ⑺ cutting head flying shear (CS) ;⑻Finish rolling high-pressure water descaling box (FSB) ; ⑼Seven-stand finishing rolling unit (F1 ~ F7) ; (10) laminar cooling device (CTC) ; (11) downcoiler (DC 1 ~ DC3) ;
- Steel coil transport chain system.
- Technical characteristics of process equipment
( 1 ) In order to save energy, reduce production and operation costs, and achieve maximum energy saving, the heating furnace can be charged by heat preservation thermal charging ( HCR ) or direct thermal charging ( DHCR ) .
( 2 ) set up fixed width presses to improve the ability of slab width adjustment, reduce the width types of continuous casting slabs, give full play to the production capacity of continuous casting machines, and help to effectively increase the ratio of hot charging and rolling and realize free rolling.
(3) The vertical roll mill is equipped with short stroke ( SSC) and automatic width control ( AWC) functions to improve the strip width accuracy.
- The roughing mill R2 adopts hydraulic fine-tuning technology to improve strip thickness accuracy, operation stability and prevent camber.
- The edge heater is set up to improve the uniformity of the transverse and longitudinal temperature of the strip to meet the production of various products.
- In order to reduce the length of the cutting head and tail of the billet and improve the finished product rate, the cutting head flying shear is equipped with a cutting head optimization control system.
- The finishing mill is equipped with a complete shape and thickness control system to obtain a good shape and improve the control accuracy of the strip's full-length thickness.
- The finishing rolling unit adopts a hydraulic low inertia looper, which is beneficial to control the speed of the finishing rolling unit and the tension of the strip.
- The finishing rolling unit adopts rolling lubrication technology, which can reduce rolling pressure, increase rolling capacity, reduce energy consumption, and improve operational stability; reduce roll wear and increase roll service life; improve roll surface conditions and increase belt Steel surface quality.
- The high-efficiency and energy-saving strip steel cooling device with flexible control can realize different cooling systems and meet the requirements of multi-variety production.
- The fully hydraulic coiler adopts side guides driven by hydraulic cylinders, pinch rolls, roll assist rolls, stepless expansion and contraction drums and high-response automatic jump control (AJC) system to improve the coiling quality of the strip
- Automation Control System
2.1 General description of automation system
2.1.1 Classification of automation system
The 2250mm hot continuous rolling automatic control system is divided into three levels.
(1) MES level
Mainly complete the tasks of material tracking, warehouse management, quality management, delivery management, roll shop management, rolling plan compilation, adjustment and distribution, actual production data collection, processing, statistical analysis, history, reports and other tasks.
(2) Process control level (L2) mainly completes material tracking, process control parameter setting and model calculation,
Quality data collection and analysis, operational guidance, and data communication tasks.
( 3 ) The basic automation level ( L1) mainly completes the sequence control of equipment, automatic position control, speed control
Control of temperature, thickness, width and shape of plate/coil, control of thermal parameters of heating furnace, various operation interfaces and data acquisition .
2.1.2 Automation system network structure
The automation system network consists of Ethernet (UDP/IP , TCP/IP) , Control LAN TC-net 100 , TOSLINE-S20 , FL net .
MES computer, L2 computer, L1 V series controller, HMI are connected on Ethernet .
L2 computer and MES manufacturing execution system's production plan management computer ( PCC ), slab warehouse management computer ( SYC ), steel coil warehouse management computer (CYC) , and roll shop management computer ( RSC) are connected via Ethernet , following the TCP/ IP and database communication protocols.
The L2 computer communicates with the L 1 V series controller through the bridge C3 , and the network complies with IEEE802.3 and TCP/IP protocols.
L1 V series controller communicates with HMI , and the network complies with IEEE802.3 and UDP/IP protocols. The screen data is refreshed once every 200ms .
L1 V series controllers communicate through the high-speed control network Control LAN TC-net 100 .
The inverter communicates with the V series controller through TOSLINE- S20 .
- Main rolling line basic automation system
2.2.1 Configuration of basic automation system
The basic automation system of the main rolling line is composed of V series controllers, HMI , ODG server / client, and V -tool server / client. See Table 1 for detailed configuration .
three types of V series controllers : STC , S3 , and C3. STC is used for rack control, S3 is used for sequence control and master control, and C3 is used for communication between L1 and L2 .
Table 1 Basic automation equipment configuration
V series controller |
STC : 34 |
|
HMI (shared by LI and L2 ) |
17 units |
V series controllers are specially designed for industrial applications. V series STC controllers are used for dynamic control ( AWC , AGC, etc.), with high-speed computing capability, and the scan period can reach 2ms . V series C3 controllers are fully PC- based. C3 controllers have all the hardware of industrial PCs and are compatible with Windows operating systems. At the same time, C3 also has the unique high-speed I / O access capabilities of PLC controllers.
ODG collects all the data of the high-speed network TC-net100 , and displays it in a trend graph to quickly diagnose the fault. This system is a server/client computer structure, the server completes the data sampling and data archiving functions, and the client computer completes the display and operation functions.
V-tool adopts the server / client structure to provide users with a platform for V controller software development and maintenance. System configuration of V controller and its I/O; programming, debugging, hardware configuration and online monitoring; multiple editing capabilities in a multi- user environment ; remote maintenance through internet .
The HMI system adopts a stand-alone model, each HMI is both a server and a client, and the development software platform adopts Intouch . HMI and V series controller adopt Ethernet UDP/IP socket communication mode, HMI collects on-site real-time data of V controller, completes data storage and processing, graphics processing, file archiving, communication management, alarm printing and other functions.
2.2.2 Basic automation control function
(1) Main functions of the rough rolling area
• Master command speed control; • Descaling open/close control; • Fixed width press (SP) plate width side pressure control; • Rough rolling APC , zero adjustment control and position display function; • Side guide plate opening control; • Rough rolling reduction position control; • Rough rolling R1 electric pressing control ; • Rough rolling R2 AGC control ; • Tension control ; • Spindle positioning control ; • Data communication with level 2 computer; • Rough rolling automatic width control (RWAC), including feedback width control ( RF-RAWC) , feedforward width control (RF-RAWC) , short stroke width control ( SSC) , dynamic setting , Neck compensation; • War buckle head correction and load balance, speed synchronization control; • Media system control; • Simulation of steel rolling; • Man-machine interface function.
(2) Main functions of the finishing area
• Speed coordination control; • Optimal cutting control of flying shear; • Sequence control; • Master control of finishing mill; • Acceleration / deceleration and operation/stop control of finishing rolling ; Water spray valve open/close control; • Looper control; • Tension control; • Automatic position control ( APC ), zero adjustment and sequence control of flying shear side guide plate and finishing mill entrance side guide plate ; • Finishing mill finish rolling temperature control ( FTC); • Rolling lubrication control; • Speed control and display function of vertical roll before finishing rolling; • Automatic position control, zero adjustment and position display of hydraulic pressure cylinder; • Automatic thickness control ( AGC) and AGC compensation; • Roll cooling control; • Rolling mill automatic position control ( APC) , zero adjustment and position display; • Roll changing equipment control ; • Finish mill vertical roll ( FIE) opening APC , zero adjustment and position display; • Finish strip shape control; • Collection and processing of actual data; • Data communication with level 2 computer; • Media system control; • Simulation of steel rolling; • Human-machine interface function.
( 3 ) Main functions of the coiler area
- Speed master control; • Steel coil tail tracking on the heat output roller table, automatic deceleration and stop control of the roller table; • Automatic selection of the working coiler; • Sequence control of the heat output roller table ; Automatic measurement; • Coiler pinch roll hydraulic control; • Coiler tension control; • Coiling roll automatic stepping control ( AJC); Hydraulic automatic position and pressure control; • Control and display of the speed of the coiler inlet pinch roller and auxiliary roll; • Sequence control of the steel coil handling equipment; • Interface control with the strapping machine; • Strip cooling equipment ( Laminar cooling, side injection) injection valve open/close control; • Short stroke control of the guide plate on the inlet side of the coiler ; • Coil temperature control ( CTC); • Data communication with 2- level computer ;
- • Media system control; • Man-machine interface function.
Conatct us
