Hot rolling mill electric drive control system

In the process of hot rolling production line, the discharged steel billet heated from the heating furnace to the target temperature first passes through the high-pressure water descaling box to remove the scale, and then enters the roughing mill stand area. The main function of rough rolling is to roll the billet heated to the target temperature for multiple passes, thin it to the target thickness, and then enter the finishing mill stand area. After being rolled by multiple stands in the finishing rolling area, the billet becomes a steel strip with a set target thickness, which is finally sent to the coiling area and wound into a steel strip coil by the coiler.

Hot rolling mill crew introduction

In the process of hot rolling production line, the discharged steel billet heated from the heating furnace to the target temperature first passes through the high-pressure water descaling box to remove the scale, and then enters the roughing mill stand area. The main function of rough rolling is to roll the billet heated to the target temperature for multiple passes, thin it to the target thickness, and then enter the finishing mill stand area. After being rolled by multiple stands in the finishing rolling area, the billet becomes a steel strip with a set target thickness, which is finally sent to the coiling area and wound into a steel strip coil by the coiler.

Basic electrical system configuration of hot mill

A. The cabinet body adopts combined GGD low-voltage distribution cabinet;

B. The control system takes the programmable logic controller (PLC) as the core, and Siemens S7-300/400 series and FM458 series are commonly used;

C. The DC drive system uses full digital DC speed regulation devices, commonly including German Siemens 6RA70, 6RA80 series, ABB DCS800 series, British Continental 590 series, etc;

D. The AC drive system uses full digital frequency conversion speed regulation device, commonly including Siemens S120 series, MM440 series, Huichuan MD380 series, etc;

E. Equipped with HMI human-machine interface (touch screen), usually Siemens TP270, MP370 series;

F. It is equipped with upper monitoring computer (industrial control computer), commonly including Advantech series, Siemens PC 847, etc.

Hot rolling steel system control function

A. Cascade adjustment control of rolling mill speed

B. Manual adjustment control of speed relationship between racks

C. Micro tension automatic control

D. Looper automatic control

E. Rolling mill screwdown control

F. Coordinated control of rolling line

G. Material tracking control

H. Short stroke control

I. Automatic width control

J. Automatic flatness control

K. Setpoint assignment

L. Actual value collection

M. Shear control of flying shear

Hot steel rolling mill system characteristics

A. The control system has the characteristics of fast dynamic response and high control accuracy. It can control the opening degree and pressing force of the side guide plate of the coiler in real time during the coiling process of the strip steel, so that the strip steel can be stabilized on the rolling centerline.

B. The whole system is executed by high-performance controller, with a high degree of automation.

C. It is composed of a fully digitally controlled DC silicon controlled speed regulating system and various detection and sensing elements, which can accurately drive the mechanical equipment according to various commands issued by the superior setting system.

D. The control system provides speed setting for each rack through the combination of cascade speed setting and automatic cascade regulation.

E. The control system generates speed correction signal according to the detected tension deviation through the micro tension regulator, adjusts the rack speed to maintain the tension value unchanged, and realizes the load balance between the front and rear racks.

F. The control system is equipped with looper adjuster, which can generate speed correction signal according to the detected looper height deviation, adjust the rack speed to maintain the looper height (looper amount) unchanged at the given value, and realize the speed flow balance of the front and rear racks.

G. In the fully automatic mode, the transmission equipment group and control functions in the rolling process are automatically controlled according to the current pass plan.