Controller and controller of rolling mill

A controller of a rolling mill which comprises a plurality of rolling mill stands and a looper located between pairs of rolling mill stands which are adjacent to each other and controls height of the looper and speed of a roll-driving motor of the rolling mill stand located on an upstream side of the looper, thereby controlling tension of a rolled material which passes the rolling mill stand on the upstream side, comprising:

• a tension control unit which outputs a tension control signal based on deviation of a detected value from a command value for the tensioning of the rolled material;
• a looper height control unit which outputs a looper height control signal based on deviation of a detected value from a command value for a prescribed looper height;
• an automatic control unit which outputs an automatic control signal for the roll-driving motor based on a speed command signal for the roll-driving motor, a tension control signal output from the tension control unit, and a looper height control signal output from the looper height control unit so that the speed of the roll-driving motor becomes stable in a desired condition;
• a manual intervention unit which is operated to control, manually, correction of the speed of the roll-driving motor;
• a speed correction unit which outputs a speed correction signal, for the roll-driving motor, in response to an operation performed for the manual intervention unit;
• and
• a manual correction amount regulator which makes a determination as to whether there is an overcorrection due to a manual operation based on the automatic control signal output from the automatic control unit and the speed correction signal output from the speed correction unit, and outputs to the roll-driving motor a product obtained by multiplying the speed correction signal output from the speed correction unit by a first prescribed gain regulation value.

A controller of a rolling mill which comprises a plurality of rolling mill stands and a looper located between pairs of rolling mill stands which are adjacent to each other and controls height of the looper and speed of a roll-driving motor of the rolling mill stand located on an upstream side of the looper, thereby controlling tension of a rolled material which passes the rolling mill stand on the upstream side, comprising:

• a load detector which detects loads acting on rolls of the rolling mill stands at the upstream side;
• a torque detector which detects torques of the roll-driving motor;
• an acceleration detector which detects acceleration of the roll-driving motor;
• a tension detector which detects the tension of the rolled material based on detection results of the load detector, the torque detector, and the acceleration detector;
• a tension control unit which outputs a tension control signal based on deviation of a detected value of the tension detector from a prescribed tension command value;
• a looper height detector which detects height of the looper;
• a looper height control unit which outputs a looper height control signal based on deviation of a detected value of the looper height detector from a prescribed looper height command value;
• an automatic control unit which outputs an automatic control signal for the roll-driving motor based on a speed command signal for the roll-driving motor, a tension control signal output from the tension control unit and a looper height control signal output from the looper height control unit so that the speed of the roll-driving motor becomes stable in a desired condition;
• a manual intervention unit which is operated to control, manually, correction of the speed of the roll-driving motor;
• a speed correction unit which outputs a speed correction signal, for the roll-driving motor, in response to an operation performed for the manual intervention unit;
• and
• a manual correction amount regulator which makes a determination as to whether there is an overcorrection due to a manual operation based on the automatic control signal output from the automatic control unit and the speed correction signal output from the speed correction unit, and outputs to the roll-driving motor a product obtained by multiplying the speed correction signal output from the speed correction unit by a prescribed gain regulation value.