CN-116727434-B - Manual intervention method for on-line thickness abnormality of medium plate steckel mill

CN116727434BCN 116727434 BCN116727434 BCN 116727434BCN-116727434-B

Abstract

The invention discloses a manual intervention method for on-line thickness abnormality of a medium plate steckel mill, which comprises the steps that after a first-stage system of the steckel mill receives related parameters sent by a second stage, a screw-down rod (11) of an electric screw-down system EGC adjusts the roll gap of an upper roll (3) to the current rolling roll gap position from large to small under the driving of a screw-down motor (12), a hydraulic AGC cylinder (1) lifts to push a lower supporting roll (2) and a lower roll to the rolling line position, a roller way (4) conveys a rolled piece (7) to conduct reciprocating rolling in the steckel mill, the head of a finished product pass rolled piece measures the feedback thickness through a thickness gauge (5), and an operator conducts manual intervention optimization by combining real-time measurement feedback of the thickness gauge (5) through the left lower angle gap+/gap-button of a rolling mill according to the feedback thickness. The invention has the advantages that the manual thickness intervention is performed by the newly added function keys of the operation interface rapidly and safely, and the product qualification rate is improved.

Inventors

YANG JINPING
LIU BING
LI SHUOYANG
OU JINXIONG
PAN YUZHU
YANG YONG

Assignees

南京钢铁股份有限公司

Dates

Publication Date: 20260505
Application Date: 20230627

Claims (4)

1. A manual intervention method for on-line thickness abnormality of a heavy and medium plate steckel mill comprises the following specific steps: After a primary system of the steckel mill receives related parameters sent by a secondary, a rolling screw rod (11) of an electric rolling system EGC adjusts the roll gap of an upper roll (3) from large to small to the current rolling roll gap position under the driving of a rolling motor (12); Step two, lifting the hydraulic AGC cylinder (1) to push the lower supporting roll (2) and the lower roller to the position of a rolling line; Thirdly, conveying the rolled piece (7) by the roller way (4) to roll in a steckel mill in a reciprocating manner; Measuring the head of the finished pass rolled piece by a thickness gauge (5) and feeding back the thickness d; and fifthly, feeding back the thickness of the head of the rolled piece (7) according to the thickness gauge (5), and controlling the hydraulic oil quantity fed in and fed out of the hydraulic AGC cylinder (1) by an operator through a tap+/tap-button at the left lower corner of a main picture of the rolling mill, so as to convert the hydraulic oil quantity into the expansion quantity of the hydraulic AGC cylinder (1), thereby controlling the thickness, and carrying out manual intervention optimization by combining real-time measurement feedback of the thickness gauge (5).
2. The manual intervention method for on-line thickness abnormality of a heavy and medium plate steckel mill according to claim 1, characterized in that: In the first step and the second step, the upper and lower rollers (3) are an upper working roller (31) of the steckel mill and a lower working roller (32) of the steckel mill.
3. The manual intervention method for on-line thickness abnormality of a heavy plate steckel mill according to claim 1 or 2, characterized in that: in the fourth step, the target thickness of the finished product pass rolled piece is set to be x, the lower limit of the thickness tolerance is +0.3mm, and the final thickness of the finished product is preferably controlled within x+/-0.2 mm.
4. The manual intervention method for on-line thickness abnormality of a heavy and medium plate steckel mill according to claim 3, characterized in that: In the fourth step and the fifth step, if the feedback thickness of the head of the rolled piece (7) is lower than the lower limit value of the thickness of the rolled piece after being measured by the thickness gauge (5), the thickness is increased by a multiple of 0.05mm each time by manual intervention, and if the feedback thickness of the head of the rolled piece (7) is higher than the upper limit value of the thickness of the rolled piece after being measured by the thickness gauge (5), the thickness is reduced by a multiple of 0.05mm each time by manual intervention.

Description

Manual intervention method for on-line thickness abnormality of medium plate steckel mill Technical Field The invention belongs to the technical field of ferrous metallurgical equipment control technology and production safety, and particularly relates to a manual intervention method for on-line thickness abnormality of a heavy and medium plate steckel mill. Background The production line of the heavy and medium plate steckel mill consists of a four-high mill, a coiling furnace, a thickness gauge, flying shears and a laminar flow cooling system. The steckel mill production line has four production modes, namely flat rolling plates, flat rolling steel coils, coil rolling plates and coil rolling steel coils, and the corresponding production modes are selected according to the planning conditions. After the rolled piece is heated by a heating furnace, surface oxide scales are removed by a descaling system, the rolled piece is transported to a steckel mill area by a roller way, the thickness and the length of a finished product are achieved through multi-pass rolling of the steckel mill, and the rolled piece is sheared into a motherboard by a flying shear and then enters a subsequent process. The length of the finished plate or steel coil produced by the flat rolling mode is 15-92 m, the blank weight is 14-42 t, the length of the plate or steel coil produced by the coil rolling mode is 80-340 m, and the blank weight is 20-67 t. In terms of thickness control, the current rolling mill thickness control mode is that after an electric rolling or hydraulic rolling system is operated to a given roll gap size under the condition that the rolling mill is empty, the rolling mill starts to bite into a rolled piece for rolling, and the roll gap is not operated under the condition that the rolling mill is loaded so as to ensure thickness stability. The main mode at present is that after the simulation calculation of the secondary system, parameters are reached to the primary system, the primary system controls specific actions of equipment, and the size of the roll gap of each pass of the rolling mill is adjusted through the reduction system of the steckel mill so as to ensure the thickness of a final finished product. The main flow thickness control mode of the prior medium plate production line is as follows: the thickness of the first and the second finishing pass thickness measuring instruments is measured in real time and the thickness of the rolling mill is controlled in a closed loop, and the second and the even finishing pass thickness measuring instruments only detect the feedback thickness, but the thickness of the rolling mill is controlled in a non-closed loop. The method is suitable for hot continuous rolling production lines and production lines with less dense field devices, and for hot rolled steckel production lines with relatively dense production field devices and moist and stuffy working environment, the thickness gauge is influenced by factors such as high temperature of a coiling furnace, frame vibration, flying shears, cooling water and the like near a rolling mill, so that the measurement accuracy deviation is relatively large, the method is not suitable for thickness closed-loop control of the rolling mill, and a mode of a main flow thickness control mode II is generally adopted in the production line of the heavy plate steckel mill, so that the thickness gauge is moved to a position at a certain distance from the rear of the rolling mill to participate in thickness detection feedback. In view of the second main stream thickness control mode, production line operators usually correct the thickness of the current rolled piece through the thickness measurement value of the last rolled piece, and once the rolled piece enters the finished product pass for rolling, the thickness of the rolled piece cannot be manually interfered, and the thickness can only be interfered before the finished product pass. When the thickness control of the steckel mill has larger deviation and is not properly corrected before the finished product passes, the thickness of the finished product passes is thicker or smaller, and the condition that the thickness of the whole rolled piece is abnormal and not planned cannot be intervened. The thickness abnormality of the whole rolled piece affects 20-340 m in terms of length, and the thickness abnormality of the rolled piece of 14-67 t can be caused to be unscheduled in terms of weight, so that the loss is relatively large for production enterprises. The thickness abnormality occurs in the daily production process, the daily accumulation and the monthly accumulation have great influence on the income of enterprises, and a solution is needed under the existing condition, so that the economic loss caused by the thickness abnormality can be effectively and rapidly avoided. Disclosure of Invention The invention aims to solve the problem of economic loss caused by abnormal thickness of