CN-117299861-B - Method for controlling uncoiling roll gap of intermediate blank steel coil of hot coil box

CN117299861BCN 117299861 BCN117299861 BCN 117299861BCN-117299861-B

Abstract

The invention relates to a control method for an uncoiling roll gap of a hot coil box intermediate blank steel coil, and belongs to the technical field of uncoiling of metal strips produced in a non-rolling mode. The method comprises the steps of firstly determining a target value G range value of an uncoiling roll gap according to the thickness of an intermediate blank of a specific hot coil box, and then fixing according to the coordinate value of a roller C, so that a target longitudinal coordinate value range of a center E point of a large idler roll can be calculated; when the shovel head contacts with the intermediate blank steel coil to unwind, the real-time longitudinal coordinate value of the E point of the center of the large idler roller is calculated through the gamma value and the beta value read in real time by the angle sensors of the D point and the O point, whether the uncoiling roll gap falls into the set uncoiling roll gap target value G range can be judged by comparing whether the real-time longitudinal coordinate value of the E point falls into the target longitudinal coordinate value range of the E point, so that the accurate control of the uncoiling roll gap is realized, and the phenomenon of tilting and tapping of the uncoiling roll gap is further solved.

Inventors

YUAN YADONG
Tao Shaobin
ZHANG XING
WU SUOTUAN

Assignees

上海梅山钢铁股份有限公司

Dates

Publication Date: 20260505
Application Date: 20220621

Claims (1)

1. A control method for uncoiling roll gaps of intermediate steel coils of a hot coil box comprises a large swing arm, an insertion arm and a shovel head, wherein one end of the large swing arm is hinged to a housing seat, the other end of the insertion arm is hinged to the other end of the large swing arm, the shovel head is hinged to the other end of the insertion arm, an oil cylinder is installed on the large swing arm, a fork head of a piston rod of the oil cylinder is hinged to one end of the insertion arm, a first angle sensor is arranged at one end of the large swing arm, one end of the insertion arm is hinged to the other end of the large swing arm, a second angle sensor is arranged on the side face of the insertion arm, and an uncoiling C roller is arranged below the shovel head, and the control method is characterized by comprising the following steps: 1) The longitudinal axial section of the hot coil box and the intermediate blank steel coil along the same running direction is set as a coordinate plane, The hinging point of the inserting arm of the hot rolling box and the large swing arm is projected in the coordinate plane to form a point D, The hinging point of the large swing arm of the hot rolling box and the housing seat is projected in the coordinate plane to form an O point, Projecting the hinging point of the insertion arm of the hot rolling box and the large idler roller on the shovel head into the coordinate plane to form an E point, The axis of the uncoiling C roller is projected in the coordinate plane to form a C point, 2) Setting a plane rectangular coordinate system by taking an O point as an origin in the coordinate plane, setting an oil cylinder to be in a full stroke state, wherein three points of ODE form a triangle delta ODE, the side lengths OD and ED of the triangle delta ODE are known fixed values, the coordinate value of a C point is a known fixed coordinate value and is recorded as (X C ,Y C ), the degree of an included angle DOE of the triangle delta ODE is a known fixed value beta 1, the included angle of an OD line segment and a longitudinal coordinate is set to be beta and is read in real time by a first angle sensor of an hinging point O, and the included angle ODE of the triangle delta ODE is set to be gamma and is read in real time by a second angle sensor of the hinging point D; 3) Setting the target value G range of the uncoiling roll gap to be 1.2 h+/-2, h being the thickness h of the intermediate blank steel coil, the radius of the uncoiling C roll to be a known fixed value R C , the radius of the large idler roll on the shovel head to be a known fixed value R E , determining the range (Y E 1,Y E 2) of the E point target ordinate value YE according to the following formula (1), Y E =Y C +R C +G+R E (1); 4) When the shovel head contacts with the intermediate blank steel coil for uncoiling, two small idler rollers on the shovel head cling to the outer circle of the intermediate blank steel coil, a large idler roller on the shovel head clings to the inner circle of the intermediate blank steel coil, at the moment, a second angle sensor at the point D reads the gamma value in real time, a first angle sensor at the point O reads the beta value in real time, the OE length is calculated in real time according to the following formula (2), OE 2 =OD 2 +DE 2 -2*OD*DE*cosγ (2), The β1 value is calculated in real time according to the following formula (3), cosβ1=(OE 2 +OD 2 -DE 2 )/2*OD*OE (3); 5) Then calculating the real-time ordinate value Y E 'of the E point according to the following formula (4)' Y E ’=OE*sin(90-β-β1) (4) 6) Comparing Y E ' with Y E , if Y E ' does not fall within the range of Y E , continuing to press down the shovel head until Y E ' falls within the range of Y E , stopping pressing down the shovel head, and locking the shovel head position.

Description

Method for controlling uncoiling roll gap of intermediate blank steel coil of hot coil box Technical Field The invention relates to a method for controlling an uncoiling roll gap in the uncoiling process of a hot coil box, belonging to the technical field of uncoiling for producing a metal strip in a non-rolling mode. Background The main function of the hot rolling box is to conduct coreless coiling on the rough rolling intermediate billet, then convert the tail part of the intermediate billet into a head part and the lower surface into an upper surface through uncoiling, and send the intermediate billet into a finishing mill group for rolling. In practical application, when the coil shape is bigger or smaller or is not round, the position of the shovel blade is inaccurate, and the uncoiling roller gap (namely the roller gap formed between the big idler roller and the uncoiling C roller when the big idler roller of the shovel head contacts the intermediate blank) is negligibly small, so that the phenomena of head beating and head tilting occur during uncoiling. According to the search, a patent similar to the scheme is CN201210083761.9, namely an uncoiling device of a hot coil box and an uncoiling control method thereof, which are used for calculating the motion stroke parameter of a round roller when a strip blank is uncoiled according to the specification and the material of a product to be uncoiled, controlling the round roller to carry out corresponding uncoiling motion by a hydraulic device according to the motion stroke parameter, and finally realizing the uncoiling of a steel coil by an uncoiling shovel blade, thereby realizing different uncoiling motions according to different product specifications, reducing scratch on the surface of strip steel and improving the surface quality of a hot rolled product. But it does not involve controlling the unwinding roll gap during unwinding to avoid a cocking head. Disclosure of Invention The invention aims to solve the technical problem that the uncoiling roll gap is controlled within a specified target value range when an intermediate blank steel coil is uncoiled, so that the phenomenon of tilting and tapping during uncoiling is avoided. The invention provides a control method for uncoiling roll gaps of intermediate steel coils of a hot coil box, which aims to solve the technical problems, and relates to a control method for uncoiling roll gaps of intermediate steel coils of a hot coil box, wherein the hot coil box comprises a large swing arm, an insertion arm and a shovel head, one end of the large swing arm is hinged to a housing seat, the other end of the insertion arm is hinged to the other end of the large swing arm, the shovel head is hinged to the other end of the insertion arm, an oil cylinder is arranged on the large swing arm, a fork head of a piston rod of the oil cylinder is hinged to one end of the insertion arm, an angle sensor is arranged at one end of the large swing arm, an angle encoder is arranged at the hinged position of the large swing arm and the insertion arm, and an uncoiling C roller is arranged below the shovel head, and the following steps are executed: 1) The longitudinal axial section of the hot coil box and the intermediate blank steel coil along the same running direction is set as a coordinate plane, The hinging point of the inserting arm of the hot rolling box and the large swing arm is projected in the coordinate plane to form a point D, The hinging point of the large swing arm of the hot rolling box and the housing seat is projected in the coordinate plane to form an O point, Projecting the hinging point of the insertion arm of the hot rolling box and the large idler roller on the shovel head into the coordinate plane to form an E point, The axis of the uncoiling roller is projected in the coordinate plane to form a point C, 2) Setting a plane rectangular coordinate system by taking an O point as an origin in the coordinate plane, setting an oil cylinder to be in a full stroke state, wherein three points of ODE form a triangle delta ODE, the side lengths OD and ED of the triangle delta ODE are known fixed values, the coordinate value of a C point is a known fixed coordinate value and is recorded as (XC, YC), the degree of an included angle DOE of the triangle delta ODE is a known fixed value beta 1, the included angle of an OD line segment and a longitudinal coordinate is set to be beta and is read in real time by a first angle sensor of an hinging point O, and the included angle ODE of the triangle delta ODE is set to be gamma and is read in real time by a second angle sensor of the hinging point D; 3) Setting the target value G range of the uncoiling roll gap to be a known fixed value range of 1.2 h+/-2,h, the thickness h of the intermediate blank steel coil, the radius of a C roller to be a known fixed value R C, the radius of a large idler roller on a shovel head to be a known fixed value R E, determining the range of a