Control method for preventing abnormal manual steel pouring of reversible H-shaped steel universal beam roughing mill set

Abstract

The invention is applicable to the technical field of electric control, and particularly provides a control method for preventing abnormal manual steel pouring of a reversible H-shaped steel universalbeam roughing mill set. The control program of the method comprises the following steps: setting the functional blocks FCYSDC01-FCYSDC15 as a determiner unit for abnormal manual steel pouring of thereversible H-shaped steel universal beam roughing mill set; and setting FCYSDC06, FCYSDC08, FCYSDC10 and FCYSDC16-FCYSDC22 as a manual speed control unit under the abnormal manual steel pouring stateof the H-shaped steel universal beam roughing mill set. When an abnormal manual steel pouring state occurs; the control program firstly decelerates and stops the three-frame main transmission of the universal beam roughing mill set. After setting the time of the three-frame shut-down, the setting value of the manual operation joy-stick output speed of the H-shaped universal beam roughing set is enabled (the setting value is shown in the description). During the period of time of abnormal manual steel pouring forced interruption, the roughing unit can have enough time to process the rolled pieces which normally stay in the universal roughing mill set, thereby thoroughly avoiding the violent self-excited oscillation of the three-frame main transmission of the universal beam roughing mill setcaused by sudden abnormal manual steel blocking slippage.

Description

technical field [0001] The invention belongs to the technical field of hot rolling looper control, and provides a control method for preventing abnormal manual steel pouring of a reversible H-shaped steel universal roughing mill. Background technique [0002] For the large H-beam production line of the Maanshan Iron and Steel Long Products Division, its H-beam universal roughing mill consists of 3 rolling mills——1# Universal Roughing Mill (U 1 ), edge rolling mill (ED) and 2# universal roughing mill (U 2 ). 1# and 2# universal roughing mills are 5500KW four-roll mills (two horizontal rolls and two vertical rolls), and edge mills are 2000KW two-roll mills (two horizontal rolls). The H-beam universal rough rolling unit can complete multi-pass reciprocating rolling of H-beam in a fully automatic mode. The procedure and the manual speed operation handle (ie JOY-STICK) are given together. In the fully automatic rolling process of the universal roughing rolling mill, it is oft...

AI Technical Summary

Problems solved by technology

However, in the automatic rolling state with large manual reverse speed intervention, once the operator switches the universal roughing unit from the automatic mode to the manual mode and forgets to return the manual speed control handle to zero due to the hasty operation, the In this case, the universal rough rolling unit will reverse the steel quickly without changing the rolling pass number. Severe self-excited oscillation may occur due to the jamming and slipping of inverted steel, which may cause damage to the main drive shaft of the rolling mill

The abnormal manual steel pouring of the large H-beam universal roughing mill of Maanshan Iron and Steel Co., Ltd. on April 21, 2018 is one example. Slipping caused severe self-excited oscillation, which resulted in the breakage of the main drive lower shaft roll and the shearing of the hydraulic safety pin of the upper shaft. This is a common loophole in the safe operation of the equipment in the control system of the reversible H-beam universal roughing mill.

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