Spark recognition-based hot-rolled coiling side guide plate control method

Patent metadata

Field	Value
Publication number	US-11766706-B2
Application number	US-202017776892-A
Country	US
Kind code	B2
Filing date	Sep 15, 2020
Priority date	Nov 21, 2019
Publication date	Sep 26, 2023
Grant date	Sep 26, 2023

Abstract

The present invention discloses a control method of hot mill coiler side guides based on spark recognition, where the side guides are adjusted according to the width of sparks from the friction between the hot rolled strip (20) and the side guides (11). An industrial camera (9) is provided obliquely above the side guides (11), and a detection system implements a real-time analysis on the images taken by the industrial camera and determines the magnitude of sparks generated on either side of the side guides according to the spark width. For each unilateral side guide, it is adjusted according to the spark width MS corresponding to that side guide (11). For said unilateral side guide (11), the deviation of the single-side spark width ΔMS is obtained according to ΔMS=MS−Maim. The position adjustment magnitude ΔWS of the unilateral side guide (11) can be obtained according to formula (I). And the pressure adjustment magnitude ΔPS of the unilateral side guide (11) can be obtained according to formula (II). This method allows the hot rolled strip (20) always in the relative center of the steel coil, reduces the wear of the side guides (11), avoids various defects of the steel coil, and makes the steel coil in good shape.

First claim

What is claimed is:

1. A control method of coiler side guides associated with a hot mill based on a spark recognition, the control method comprising:
a step of preparatory opening adjustment: before a hot rolled strip enters an area of the side guides, adjusting the opening of the side guides to a preparatory opening;
a step of installation: installing an industrial camera obliquely above an entrance of two side guides, the range of the industrial camera covering a whole area of each side guide, and the industrial camera transmitting captured images to a detection system in real time via a communication line;
a step of image analysis: for each unilateral side guide, a detection system implementing a real-time analysis on images of sparks taken by the industrial camera, wherein the sparks come from friction between the unilateral side guide and the hot rolled strip, so as to identify a single spark having a largest transverse width generated on the unilateral side guide, and the transverse width of the single spark being recorded as spark width M S ;
a step of dynamic adjustment: this step starting from a head of the hot rolled strip reaching coiler pinch rolls associated with the hot mill till a tail of the hot rolled strip is out of the coiler pinch rolls;
the step of dynamic adjustment comprising: setting a target spark width M aim , and performing a dynamic adjusting process for each unilateral side guide;
the dynamic adjusting process for each unilateral side guide comprising: obtaining a spark width deviation ΔM S of the unilateral side guide according to a first formula shown as ΔM S =M S −M aim , and implementing a controlling adjusting method for the unilateral side guide according to the spark width deviation, ΔM S of the unilateral side guide, wherein
when a thickness of the hot rolled strip, h strip ≤h, the controlling adjusting method for side guides is a position controlled adjusting method, and when the thickness of the hot rolled strip h strip >h, the controlled adjusting method of side guides is a pressure controlled adjusting method, wherein h is a preset reference thickness;
the position controlled adjusting method comprising: obtaining a position adjustment magnitude ΔW S of the unilateral side guide according to a second formula shown as

Δ
⁢

W
S

=

K

t
⁢
o
⁢
t
⁢
o
⁢
l
⁢
1

×

(

K

P
⁢
1

+

K

I
⁢
1

s

)

×
Δ
⁢

M
S

,

wherein K total1 is total gain, K P1 is proportional coefficient, K I1 is integral coefficient, S is Laplace operator, then obtaining a target position W S of the unilateral side guide according to a third formula shown as W S =W S ′+ΔW S , wherein W S ′ is the position of the unilateral side guide before adjustment, and adjusting the position of the unilateral side guide to the target position W S ′ of the unilateral side guide;
the pressure controlled adjusting method comprising: obtaining a pressure adjustment magnitude ΔP S of the unilateral side guide according to a fourth formula shown as

Δ
⁢

P
S

=

K

t
⁢
o
⁢
t
⁢
o
⁢
l
⁢
2

×

(

K

P
⁢
2

+

K

I
⁢
2

s

)

×
Δ
⁢

M
S

,

wherein K total2 is total gain, K P2 is proportional coefficient, K I2 is integral coefficient, S is Laplace operator, then obtaining a target pressure P S of side guides for the unilateral side guide according to a fifth formula shown as P S =P S ′+ΔP S , wherein P S ′ is the pressure on the unilateral side guide before adjustment, and adjusting the position of the unilateral side guide so that the pressure on the unilateral side guide is consistent with the target pressure P S of side guide.

2. The control method of coiler side guides associated with the hot mill based on the spark recognition of claim 1 , wherein the step of dynamic adjustment comprises:
a first dynamic adjusting step: this step starting from the head of the hot rolled strip reaching the coiler pinch rolls till the tail of the hot rolled strip is out of an F1 stand;
the first dynamic adjusting step comprising: setting the target spark width M aim as a first target spark width M aim1 , after the head of the hot rolled strip reaches the coiler pinch rolls, performing a dynamic adjusting process for each unilateral side guide until the head of the hot rolled strip goes out of the coiler pinch rolls by a length of L head , wherein L head is a preset length of the strip head;
the first dynamic adjusting step further comprising: when the head of the hot rolled strip goes out of the coiler pinch rolls by a length that exceeds the length of the strip head L head , recording a real-time position of the unilateral side guide as a target lock position W LK , then adjusting the position of the unilateral side guide to W LK +ΔW 3 , and locking the position of the unilateral side guide until the tail of the hot rolled strip is out of the F1 stand, wherein ΔW 3 is a preset target positio

Assignees

• Baoshan Iron & Steel

Inventors

• Li Jiabo
• Sun Hongfeng
• Chen Jianrong
• Zhang Jianmin

Classifications

• B21B37/68 Primary

  Camber or steering control for strip, sheets or plates, e.g. preventing meandering · CPC title

• B21B37/16

  Control of thickness, width, diameter or other transverse dimensions (B21B37/58 takes precedence) · CPC title

• B21C47/3416 Primary

  with lateral edge contact · CPC title

• B21B39/14

  Guiding, positioning or aligning work (B21B43/12 takes precedence; guides in which work is subjected to permanent internal twisting B21B15/02) · CPC title

• B21B38/00

  Methods or devices for measuring, {detecting or monitoring} specially adapted for metal-rolling mills, e.g. position detection, inspection of the product {(control devices or methods B21B37/00)} · CPC title