Control method of head shearing speed of flying shears for hot continuously rolled band steel

Abstract

The invention provides a control method of the head shearing speed of a pair of flying shears for hot continuously rolled band steel and belongs to the technical field of metallurgy. The control method comprises the steps that firstly, an HMD60 hot metal detector is installed at the position 3 meters away from the flaying shears; secondly, the head shearing speed of the flying shears is set to be 0.8 m / s- 1.5 m / s; thirdly, no band steel exists in the area of the flying shears, the speed of a roller way in the area of the flying shears is 0.8 m / s- 1.5 m / s; and fourthly, when the band steel passes through the area of the flying shear, the speed of the roller way in the area of the flying shear is the product of the F0 machine frame speed actual value and the F0 machine frame backward slip coefficient. By the adoption of the control method of the head shearing speed of the pair of flying shears for the hot continuously rolled band steel, the influence of frequent change of the speed of the roller way on the actual band steel speed is eliminated, and the problem of the influence of faults of a laser velocimeter on production operation is also solved; and the stability of band steel head shearing control is achieved, and fault time is shortened.

Description

technical field

[0001] The invention belongs to the field of metallurgy and relates to the automatic control of the speed in the finish rolling area of ​​hot continuous rolling strip steel. Background technique

[0002] The finishing rolling area of ​​hot continuous rolling includes finishing rolling descaling roller tables, flying shears, racks, etc. Flying shear control is usually equipped with: a laser velocimeter to measure the speed of the strip head, a thermal detector for position detection, a controller, and an encoder for the speed measurement of the strip tail. Since the laser velocimeter is very expensive and the accuracy of the strip steel measurement speed is very critical, in order to ensure the shear control, the stability of the roller table speed before the flying shear plays an important role in the strip steel shear control. Because the original design speed of the roller table in this area is the actual value of the F0 speed multiplied by the back slip c...

Examples

Embodiment 1

[0020] The primary controller sets the strip head shear velocity to 1m / s.

[0021] When there is no strip in the flying shear area, the computer controls the speed of the roller table in the flying shear area to be 1m / s; since when the strip reaches the flying shear area, the speed of the roller table in the flying shear area is already 1m / s, thus ensuring the actual The speed is stable and the same as the shearing speed of 1m / s, which solves the frequent changes in the speed of the roller table; if the laser velocimeter detects a fault at this time, the cutting accuracy of the strip head can be guaranteed, which can be guaranteed without the need for a laser velocimeter The control target of shearing; when the flying shear has finished cutting the head of the strip steel, there is strip steel in the flying shear area at this time, and the speed value of the roller table in the flying shear area should be changed to the actual value of F0 speed multiplied by the back slip coeff...

Embodiment 2

[0024] The primary controller sets the strip head shear velocity to 1.2m / s.

[0025] When there is no strip in the flying shear area, the computer controls the speed of the roller table in the flying shear area to be 1.2m / s; since when the strip reaches the flying shear area, the speed of the roller table in the flying shear area is already 1.2m / s, thus ensuring that the belt The actual steel speed is stable and the same as the shear speed of 1.2m / s, which solves the frequent changes in the speed of the roller table; if the laser speedometer detects a fault at this time, the cutting accuracy of the strip head can be guaranteed, and the laser speedometer is not required. The control target of cutting can be guaranteed; when the flying shear has cut the head of the strip steel, there is strip steel in the flying shear area at this time, and the speed value of the roller table in the flying shear area should be changed to F0 after multiplying the actual speed value of the frame s...

technical field

[0001] The invention belongs to the field of metallurgy and relates to the automatic control of the speed in the finish rolling area of ​​hot continuous rolling strip steel. Background technique

[0002] The finishing rolling area of ​​hot continuous rolling includes finishing rolling descaling roller tables, flying shears, racks, etc. Flying shear control is usually equipped with: a laser velocimeter to measure the speed of the strip head, a thermal detector for position detection, a controller, and an encoder for the speed measurement of the strip tail. Since the laser velocimeter is very expensive and the accuracy of the strip steel measurement speed is very critical, in order to ensure the shear control, the stability of the roller table speed before the flying shear plays an important role in the strip steel shear control. Because the original design speed of the roller table in this area is the actual value of the F0 speed multiplied by the back slip c...

Examples

Embodiment 1

[0020] The primary controller sets the strip head shear velocity to 1m / s.

[0021] When there is no strip in the flying shear area, the computer controls the speed of the roller table in the flying shear area to be 1m / s; since when the strip reaches the flying shear area, the speed of the roller table in the flying shear area is already 1m / s, thus ensuring the actual The speed is stable and the same as the shearing speed of 1m / s, which solves the frequent changes in the speed of the roller table; if the laser velocimeter detects a fault at this time, the cutting accuracy of the strip head can be guaranteed, which can be guaranteed without the need for a laser velocimeter The control target of shearing; when the flying shear has finished cutting the head of the strip steel, there is strip steel in the flying shear area at this time, and the speed value of the roller table in the flying shear area should be changed to the actual value of F0 speed multiplied by the back slip coeff...

Embodiment 2

[0024] The primary controller sets the strip head shear velocity to 1.2m / s.

[0025] When there is no strip in the flying shear area, the computer controls the speed of the roller table in the flying shear area to be 1.2m / s; since when the strip reaches the flying shear area, the speed of the roller table in the flying shear area is already 1.2m / s, thus ensuring that the belt The actual steel speed is stable and the same as the shear speed of 1.2m / s, which solves the frequent changes in the speed of the roller table; if the laser speedometer detects a fault at this time, the cutting accuracy of the strip head can be guaranteed, and the laser speedometer is not required. The control target of cutting can be guaranteed; when the flying shear has cut the head of the strip steel, there is strip steel in the flying shear area at this time, and the speed value of the roller table in the flying shear area should be changed to F0 after multiplying the actual speed value of the frame s...