CN-118106351-B - Auxiliary threading method for pinch roll of coiling machine in hot-rolled strip steel production line

CN118106351BCN 118106351 BCN118106351 BCN 118106351BCN-118106351-B

Abstract

The invention discloses an auxiliary threading method for a pinch roll of a coiling machine in a hot rolled strip steel production line, which belongs to the field of steel production, wherein a pinch roll control mode comprises a pressure control mode, a speed control mode and a position control mode, in the position control mode, a lower pinch roll transversely moves to a position vertical to the center of a circle of an upper pinch roll when a strip steel head is threaded, and the upper pinch roll is pressed down to a set roll gap position G 1 . The invention ensures that the pinch roll provides the auxiliary threading function of the strip steel head by adjusting the position, the speed and the pressure control of the pinch roll of the coiling machine, thereby reducing the sleeve lifting of the thin strip steel head, improving the production stability of the thin strip steel and increasing the economic benefit of the hot-rolled strip steel production line.

Inventors

ZHENG XUTAO
ZHU ZHONGKUN
DU JIANQUAN
KONG XIANGBING
JI WEIBIN
YU YAO
LONG YINGRUI
LI GUOLIANG
LI TAO

Assignees

日照钢铁控股集团有限公司

Dates

Publication Date: 20260508
Application Date: 20240403

Claims (3)

1. A method for assisting threading of pinch rolls of a coiling machine in a hot rolled strip steel production line is characterized in that the control modes of the pinch rolls comprise a pressure control mode, a speed control mode and a position control mode; The position control mode comprises the steps that in the strip steel head threading mode, a lower pinch roll transversely moves to a position perpendicular to the center of an upper pinch roll, the lower pinch roll transversely moves to a position perpendicular to the center of the upper pinch roll, specifically, a deflection angle alpha=0 of the upper pinch roll relative to the lower pinch roll, a calculation formula of a set roll gap position G 1 ;G 1 of the upper pinch roll is G 1 ＝H-a 1 , wherein H is the thickness of strip steel, a 1 is a fixed value, the pinch roll operates in a speed control mode, if the coiling machine does not coil steel, the upper pinch roll is pressed down to a set roll gap G 1 according to the thickness H of strip steel, if the coiling machine is coiling steel, the upper pinch roll is kept under pressure control when the upper pinch roll is already in the pressing position, after a downstream coiling machine is tensioned, the upper pinch roll gap is opened to G 2 , and the lower pinch roll transversely moves to a position to be coiled steel; In the speed control mode, if the coiling machine is not coiling steel, the upper pinch roll is operated at the advance speed V 1 after being pressed down to a set roll gap G 1 , the calculation formula of the advance speed V 1 is V 1 ＝V 0 ×(1+a 2 , wherein V 0 is the finish rolling outlet strip steel speed, a 2 is different set values according to different strip steel thicknesses, if the coiling machine is coiling steel, the coiling machine is operated at the advance speed V 1 after being sheared by a high-speed flying shear, and the coiling machine is operated at the strip steel speed V 0 after being tensioned by a downstream coiling machine; In the pressure control mode, if the coiling machine does not coil steel, after the head of strip steel reaches the pinch roll of the coiling machine, the pinch roll executes a low pressure control mode, the pressure set value is executed according to F 1 , if the coiling machine is coiling steel, after shearing of high-speed flying shears, the pressure set value is executed from the pressure F 0 to the set pressure F 1 of the low pressure mode, and after the downstream coiling machine is built, the pressure mode is cancelled, the roll gap is opened, and the position control mode is switched.
2. The method for assisting strip threading of pinch rolls of a coiler for hot strip production line according to claim 1, wherein in the position control mode, traversing of the lower pinch rolls is achieved by a traversing mechanism.
3. The method for assisting strip threading by pinch rolls of a coiler for hot rolled strip production line according to claim 1, wherein in the pressure control mode, F 1 is a fixed pressure value given by a table look-up method according to the strip thickness T.

Description

Auxiliary threading method for pinch roll of coiling machine in hot-rolled strip steel production line Technical Field The invention relates to a steel production method, in particular to a method for assisting in threading a pinch roll of a coiling machine in a hot-rolled strip steel production line. Background The hot rolling coiling machine is the last procedure of a hot continuous rolling production line, strip steel passes through a pinch roll in the process of being conveyed from a finishing mill group to the coiling machine group, and the pinch roll has the main function of applying a certain clamping force on the strip steel in the stage of biting the steel at the head part and simultaneously performing first bending deformation on the strip steel. The space below the pinch rolls is slightly affected, the pinch roll adopts a guide plate in front and back the front roller way and the rear roller way of the pinch roller are connected, and the length of the pinch roll outlet guide plate is longer. When the head of the thin strip steel passes through the pinch roll and passes through the downstream coiling machine, after the strip steel contacts with a guide plate below the pinch roll, the strip steel is easily sleeved at the position due to high resistance, stacking occurs when serious, production waste steel accidents occur, and the production stability of the thin strip steel is seriously restricted. In the prior art, the abnormal threading condition of the strip steel head impacting guide plate sleeve can only be detected and treated in time, for example, the automatic detection and automatic scrap saving of the strip steel head turning up and the strip steel head impacting guide plate sleeve lifting are realized in a method and device for preventing the waste steel of a coiling machine (CN 201811005100.8), so that the waste steel accident of the coiling machine is reduced. A control method of hot rolling coiling tension (CN201210133378. X) aims at the problem of sleeve lifting of the tail of thin high-temperature hot rolled strip steel on a roller way, and improves the running stability of the tail of the strip steel on the roller way through a novel coiling machine tail tension conversion method, and reduces the coil defect and edge defect generated by the method. In conclusion, the problem of abnormal threading caused by regional resistance when the head of the strip steel impacts the guide plate to lift the sleeve cannot be improved. Disclosure of Invention Aiming at the defects in the prior art, the technical task of the invention is to provide a method for assisting in threading a strip by a pinch roll of a coiling machine in a hot-rolled strip steel production line, wherein the pinch roll provides the strip head part for assisting in threading by adjusting the position, the speed and the pressure control of the pinch roll of the coiling machine, so that the head part of the thin strip steel is sleeved, the production stability of the thin strip steel is improved, and the economic benefit of the hot-rolled strip steel production line is increased. The technical scheme for solving the technical problems is that the method for assisting in threading the strip by the pinch roll of the coiling machine of the hot rolled strip steel production line is characterized in that a pinch roll control mode comprises a pressure control mode, a speed control mode and a position control mode; In the position control mode, the lower pinch roll transversely moves to a position vertical to the center of the upper pinch roll when the head of the strip steel passes through the strip steel, the upper pinch roll is pressed down to a set roll gap position G 1, the pinch roll operates in a new speed control mode, the upper pinch roll is pressed down to a set roll gap G 1 according to the thickness H of the strip steel if the coiling machine does not coil the strip steel, the upper pinch roll is kept under pressure control when the coiling machine is coiling the strip steel and is already at the pressed down position, the roll gap of the upper pinch roll is opened to G 2 after the downstream coiling machine is tensioned, and the lower pinch roll transversely moves to the position to be coiled; In the speed control mode, if the coiling machine does not coil steel, the upper pinch roll runs at the advance speed V 1 after being pressed down to a set roll gap G 1, if the coiling machine is coiling steel, the coiling machine runs at the advance speed V 1 after being sheared by high-speed flying shears, and runs at the strip steel speed V0 after the downstream coiling machine is tensioned; In the pressure control mode, if the coiling machine does not coil steel, after the strip steel head reaches the pinch roll of the coiling machine, the pinch roll executes a low pressure control mode, the pressure set value is executed according to F1, if the coiling machine is coiling steel, after the high-speed flying shears shear, the pr