Automatic control system of the hottest strip hot

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Automatic control system of hot strip rolling production line

0 preface

the 880mm medium and wide band hot strip rolling mill production line of Lingyuan Iron and steel company began construction in 1992. This is the first engineering project in China that has completely relied on its own technical strength to design and support the automatic control system for the medium and wide-band hot strip mill and achieved good results. This set of rolling mill was originally the solution of Leverkusen factory 19 of Krupp company in Germany: the powertest3.0 software must back up the E, B, l, l, B files under the software installation path and the database files under the name of the data folder. It was built in 56 years, and was relocated to Lingyuan Iron and steel company in 1993. Necessary modifications were made in the layout of process equipment. The main electrical control systems are all equipped in China, and the plant is expanded by using the old plant, which has been put into operation in a short time and achieved results, laying the foundation for Linggang to increase production and create efficiency

during the construction, the Automation Research Institute of the Ministry of metallurgy undertook the design of new equipment for all electrical control systems and the repair and modification of old equipment, which is of typical significance in the construction of similar production lines. Taking the implementation process of the project as an example, this paper introduces the basic structure, hardware and software configuration, control function, system testing and field debugging of the automatic control system of the hot tandem rolling production line, so as to provide reference for similar projects in the future

1 process introduction

after the transformation of the production line, a typical 3/4 continuous rolling mode has been formed, with a total installed capacity of 37000kw and an annual output of 500000 t hot rolled coils. The process equipment includes four parts: heating furnace area, roughing area, finishing area and coiling area. As shown in Figure 1

the heating furnace is a pusher type heating furnace, which is composed of charging platform, furnace body, reclaimer, steel reclaimer and other equipment

the roughing area is mainly composed of a vertical roll mill (E1), a four roll reversible roughing mill (R1) with electric pressing, front and rear side guides, a two roll one-way roughing mill (r interior decoration materials are all developed and evolved from the way of manual, bulk and on-site production and processing to the way of factory standardization, modularization, intensification and on-site integrated installation 2), a two station hot coil box (CB), flying shear (SH) and roller table

the finish rolling area is mainly composed of one vertical roll mill (E2), four high finish rolling mills (F1, F2, F3, F4, F5, F6), looper devices (H1, H2, H3, H4, H5), guide devices, etc

the coiling area is mainly composed of two sets of pinch rolls, underground coilers (DC1, DC2), waste coiler, coil unloader, transportation chain, etc

the technological process is as follows: the incoming 150mm thick and 7500mm long continuous casting billet is heated in the heating furnace, rolled by R1 for 5 ~ 7 passes, and then rolled by R2 for 1 pass to form a 16 ~ 25mm intermediate billet, which is rolled up by the hot coil box for insulation, and then adjusted from head to tail after uncoiling. It enters the finishing mill for 6 passes to form a 2 ~ 6mm thin plate, which is rolled into a strip coil by the coiler after being cooled by water spray

2 control system configuration

2.1 system mode

since the 1960s, the automation of hot strip mills has been developing, and a computer automatic control system with complete functions, mature technology and remarkable effects has been formed. According to the needs of production, the electrical control system of the rolling line is configured in three levels: operation station system, automatic control system, electrical drive and detection instrument system. The control functions of each part are realized by application software and reside in each control subsystem. The control information of each part is transmitted through the computer network. The hierarchy is shown in Figure 2

this is a typical basic automatic control system. Its core is the level 1 automatic control system, which completes all control functions and coordinates the whole production process; Level 0 transmission system, instrument system and other pneumatic and hydraulic equipment are used as actuators to complete energy conversion and drive mechanical equipment; The level 2 operation station system, as a human-machine interface device, completes the tasks of setting, monitoring, statistics and so on in the production process. The engineer station is mainly used by engineers and technicians to regularly carry out necessary maintenance and technical training for the control system. During the production process, the engineer station can also work offline. These three parts constitute a complete control system to complete the coordinated automatic control of the whole production line, and each layer is divided into several subsystems to complete the corresponding control tasks

this control system mode, which is both practical and economical, is accepted by most users, and is also widely used by domestic small and medium-sized enterprises at present

2.2 hardware system

according to the needs of production and the operation logic relationship between various process equipment in production, the electrical control system of the whole production line is divided into two sections: rough rolling section and finish rolling coiling section. The two-stage systems are not only independent, but also interconnected and coordinate work, which are described below

2.2.1 roughing section

the hardware system of roughing section is composed of 1 set of operation station system and 6 sets of programmable controller system. The operation station system is a new system, which is mainly configured by ibm-7537 industrial control microcomputer; The programmable controller system is divided into three parts: the speed control and screwdown control of R1 rolling mill are respectively composed of plc5/40l new system of A-B company, the control system of R2 and the control system of hot coil box are respectively composed of three S5 130a old systems of Siemens company, the flying shear control system is composed of SLC500 new system of A-B company, and the new system is connected by a-bdhplus. The information exchange between the old and new systems is carried out through hardware i/o. As shown in Figure 3

2.2.2 finishing rolling coiling section

the hardware system of finishing rolling coiling section is composed of two sets of operation station systems and six sets of programmable controller systems, all of which are new systems, which respectively complete the speed, screwdown, looper, 1 coiler, 2 coiler and water spray cooling control functions of finishing mill. The operation station system is mainly configured by ibm-7537 industrial control microcomputer; The programmable controller system is mainly configured by the plc5/40l new system of A-B company, which is connected by a-bdhplus. The transmission system is composed of an analog U2 system, which interfaces with the automation system through hardware i/o. As shown in Figure 4

2.3 software system

the software system is divided into two parts: system software and application software

the system software of the operating station system is mainly composed of Windows operating system and a-bcontrolview screen software

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