Control system for suppressing impact speed drop and torsional oscillation of rolling mill transmission system

Abstract

The invention discloses a control system of dynamic deceleration and torsional to inhibit the driving system of rolling mill in the rolling mill driving control domain, which comprises the following parts: two-quality elastic driving system of rolling mill, control system and power variable-flow system, wherein two-quality elastic driving system of rolling mill contains rolling mill and roller to connect by connection axle; the control system contains load observer, state feedback gain amplifier and motor speed-adjusting system; the power variable-flow system is electric power electronic transformer, which transforms the electrical network voltage and current into fitful motor voltage and current to drive the motor speed-adjusting operation according to the control pressure.

Description

technical field [0001] The invention belongs to the field of rolling mill transmission control, and in particular provides a control system for suppressing dynamic speed drop and torsional vibration of a rolling mill transmission system. Background technique [0002] The rolling mill transmission system is a complex multi-mass elastic system, and its mechanical model can be roughly equivalent as Figure 4 In the two-mass elastic system shown, two inertial links (motor and roll) are connected by an elastic link (connecting shaft). The transfer function structure block diagram of the system Figure 5 shown. Under the sudden load of the rolling mill transmission system (such as biting steel, throwing steel, braking, shifting, etc.), the system will experience unstable torsional vibration (referred to as torsional vibration), and the maximum torque on the connecting shaft caused by torsional vibration The value is much larger than the static torque during normal rolling, and i...

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Problems solved by technology

[0004] The control system will produce a large dynamic speed drop when the load is suddenly added to the rolling mill. At the same time, since the speed detection value is the motor speed, the speed control system cannot suppress the speed oscillation caused by the elastic torsion of the roll.

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