SU508286A1 - Device for determining the start of rolling mill rolling - Google Patents

Description

The aim of the invention is to increase the mill stopping accuracy and increase the reliability of its operation, including the mode of loss of tension on the strip at the mill entrance.

This is achieved by using a strip elongation ratio detection unit based on signals from the strip length sensors at the inlet and outlet of the mill, which is used in calculating the braking path and for determining the input speed through the output speed and the path for determining the length of the cable (strip in a roll to determine the lanes at the entrance of the largest path traveled by the strip pa output of the mill.

The drawing shows a block diagram of an apparatus for determining the start of braking of a rolling mill.

SUBSTANCE: device comprises a measuring mill 1, a measuring roller 2, a first working stand 3, a second working stand 4 and an output stand 5, an unwinder rotation speed sensor 6, a strip length sensor 7 at the mill input and a strip length sensor 8 at the mill output, cyclic 9 blocks for determining the strip length in a roll, a unit 10 for cyclically determining the stretch ratio of a strip, a unit 11 for determining the current value of a strip length in a roll, a unit 12 for determining the current value of a braking path of a mill and a unit 13 for generating a signal at the beginning of braking.

The operation of the proposed device is based on the implementation of the following algebraic expression:

LO) (Lj,} L

SR

 CYL -§4 Lr

2 | .ip

.up

where j.t, is the stretch ratio of the strip on the mill.

The device works as follows.

At the time of completion of every 2p revolutions, the decoiler in block 9 is determined by the magnitude (Lj-LO) (Lj + LO)

strip lengths in roll

4nhp

ne, and in block 10, the strip extrusion ratio (.1 /,. The values found go to block 11 from blocks 9 and 10 and to block 12 from block 10, after which the signals from sensor 8 in block 11 determine the current length lanes at the entrance, and in block 12 is the magnitude of the path

braking mill. In this case, in blocks 9 and 10, new values of the lengths of the strip in the roll and the stretch ratio of the strip are determined. The values from blocks 11 and 12 arrive at the inputs of block 13. If during the next 2p turns of the unwinder there is no equality of the blocks from blocks I and 12, then at the moment of completion of the next 2p turns of the unwinder to blocks I and 12 the new values of constant coefficients n the cycle is repeated, and so on. If during the next 2p turns of the unwinder comes the equality of the values from the blocks And 12, then the signal at the beginning of the deceleration of the mill appears on the output of block 13.

Thus, the device allows to increase the shutdown accuracy and reliability of its operation.

Claims (1)

Invention Formula A device for determining the start of braking of a rolling mill, comprising unwinder rotational speed sensors, input strip lengths and strip lengths at the mill output, a cyclic block for determining the strip length in a roll, a block for determining the braking path of the mill, a block for determining the current length of a roll in a coil, and a signal generation unit the beginning of braking, characterized in that, in order to increase the accuracy and reliability of the system, including the mode of dropping the tension at the mill output due to the loss of adhesion of the strip to the drum unwinding ate and the measuring roller at the inlet end to the winding roll, it .primenen coefficient determining unit drawing ri- band, to the inputs of which are connected the output of the sensor strip length on the mill entrance and exit strip gauge length at the mill output, and the outputs of which are connected to the input of the block for determining the braking path and the input of the block for determining the current length of the strip in the roll, and to the input of the block it is determined specific to the current length of the strip In the roll, the output of the strip length sensor at the mill outlet is connected. Sources of information taken into account at the examination: 1 Auth. St. No. 362283, M.C. G 05v 19/30, 1973. I B