SU1344441A1 - Method of controlling the skin-rolling mill - Google Patents

Abstract

This invention relates to the field of automatic control of rolling processes. The purpose of the invention is to protect the rolls from damage and reduce downtime of the mill. The goal is achieved by the fact that when a strip is broken in any gap between the spaces, first unwind the brake with an intensity sufficient to break the strip of the unwinder, and then the rolling mill. 1 il. (L

Description

113

This invention relates to the automatic control of rolling processes. The purpose of the invention is to protect the rolls from damage and reduce downtime of the mill.

The drawing shows a scheme that implements a method for controlling a training mill.

The device contains an unwinder electric motor 1, the root winding of which is connected to converter 2, speed sensor 3 and current sensor 4 connected to speed controllers 5 and current 6, respectively, limiting unit 7 is connected in parallel to speed controller 5, tension regulator 8 and speed controller 5 are connected to current controller 6 by contacts of relay 9, relay 10 intermediate, time relay 11, disconnecting contacts 12 of the tension sensors relay (not shown), contact 13 of mill speed relay, button button VK li ne termination band at unwinder, contacts 14 and 15 on and off buttons tension control mode.

The scheme works as follows. When rolling the electric drive, the unwinder operates in the mode of tension control between the uncoiler and the first stand, the relay 9 is turned on and the tension regulator 8 is connected to the current regulator 6, the speed regulator 5 is disconnected, the relay contacts 12 are disconnected The sensors for the presence of tension are open, the opening contact 13 of the zero speed relay (not shown) is closed, the intermediate relay 10 is off, the time relay 11 is off. In the event of a strip breakage during rolling in the interstand gap, behind the camp or in front of the camp, one of the contacts 12 of the sensor relay 12 is closed (or the button 13 is closed by the operator), turning on the intermediate relay 10. Relay 10 turns on, disconnects. Relay 9 on

No tension control mode, includes a time relay 11. The contacts of the relay 9 switch the electric drive unwinder from the tension control mode to the speed control mode.

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With a zero speed reference. In order for the motor core current not to exceed the maximum allowed by the switching conditions, the output signal of the speed controller 5 is limited by the limit block 7.

As a result, the unwinder motor slows down as much as possible, causing the strip to break in front of the mill, resulting in high tension on the rolled strip. After a time sufficient to break the strip at the washout device, the time relay 11 switches the forced braking of the mill into contact with the mill control circuit; after stopping the mill, contact 13 of the mill zero-speed relay shuts off the intermediate relay 10, in order to reset the circuit to its initial state.

The proposed method for controlling the temper mill differs significantly from the known one, since in addition to the modes of adjusting the tension of the strip during rolling and speed control during refueling of the strip, it provides for an additional mode of operation, i.e. breakage of the strip between the unwinder and the mill and braking of the unwinder with maximum intensity. This mode is different from the normal mill braking, in which the decoiler brakes synchronously with the mill while maintaining the tension of the strip. The proposed control method protects the rolls from damage and reduces mill downtime.

Claims (1)

Invention Formula The method of controlling the training camp, including forced braking of the training mill and the spreader when the strip is broken in any interfloor gap, characterized in that, in order to protect the rolls from damage and reduce downtime of the mill, at the beginning of the brake retard the burr with an intensity sufficient to break the strip at the uncoiler, and then - training camp. eight Editor A. Dolinich Compiled by A. Sergeev Tehred I.Popovich Proofreader I. Muska Order 4874/10 Circulation 480 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4