Plating adhesion amount control mechanism and method for controlling an adhesion amount by comparing a plating adhesion amount estimation value at an upstream position and a plating adhesion actual amount at a downstream position

Patent metadata

Field	Value
Publication number	US-11248288-B2
Application number	US-201716479457-A
Country	US
Kind code	B2
Filing date	Apr 14, 2017
Priority date	Apr 14, 2017
Publication date	Feb 15, 2022
Grant date	Feb 15, 2022

Abstract

When a portion for measuring the plating adhesion amount reaches an upstream side position, plating adhesion amount estimation values are calculated by using a plating adhesion amount estimation expression at positions away from a position that faces the distance sensors, that is, the upstream side position, by strip-width direction distances, of the surfaces of the steel strip. When the portion for measuring the plating adhesion amount reaches a downstream side position, the strip-width direction distances of the plating adhesion amount meters are matched to the strip-width direction distances, and the plating adhesion amount actual measurement values are obtained. The plating adhesion amount estimation expression is corrected on the basis of the differences between the plating adhesion amount estimation values and the plating adhesion amount actual measurement values. Accordingly, the control accuracy of the plating adhesion amount is improved.

First claim

The invention claimed is:

1. A plating adhesion amount control mechanism, comprising: a pair of gas wiping nozzles disposed such that a steel strip pulled up from a plating tank is transferred therebetween, the gas wiping nozzles being configured to blow a gas onto the steel strip; an upper setting position wherein a transferring direction of the steel strip is chanced to a horizontal direction;
a distance sensor disposed at an upstream side position which is a position upstream to the upper setting position of the steel strip, the distance sensor being configured to detect a nozzle-strip distance which is a distance between the gas wiping nozzles and a strip surface;
an upstream-side edge sensor disposed at the upstream side position the steel strip and configured to detect an upstream-side edge position which is a first edge position of the steel strip;
a downstream-side edge sensor disposed at a downstream side position which is a position downstream of the upstream side position of the steel strip and configured to detect a downstream-side edge position which is a second edge position of the steel strip;
a plating adhesion amount meter disposed at the downstream side position with respect to the upper setting position of the steel strip and configured to detect a plating adhesion amount of a metal plating layer formed on the steel strip and output a plating adhesion amount actual measurement value; and
a plating adhesion amount controller having a plating adhesion amount estimation expression for calculating a plating adhesion amount estimation value of a first measurement surface portion which is a first position on the strip surface at which the plating adhesion amount is to be measured by the plating adhesion amount meter, when the first measurement surface portion passes the upstream side position using arithmetic elements including: the nozzle-strip distance; a blowing pressure of the gas; a steel strip passing speed; and a specific distance in a strip width direction between the upstream-side edge position and the first measurement surface portion, said specific distance is equal in distance in the strip width direction between the downstream-side edge position and the first measurement surface portion, wherein the plating adhesion amount controller is configured to obtain a difference between the plating adhesion amount estimation value which is calculated when the first measurement surface portion passes the upstream side position and the plating adhesion amount actual measurement value detected when the plating adhesion amount meter faces the first measurement surface portion and the first measurement surface portion passes the downstream side position, and correct the plating adhesion amount estimation expression so as to reduce the difference to zero.

2. The plating adhesion amount control mechanism according to claim 1 , further comprising:
a movable body configured to move the plating adhesion amount meter in the strip width direction; and
a movable body control part configured to control the movable body to move in the strip width direction,
wherein the distance sensor is configured to detect the nozzle-strip distance at a position at which the distance in the strip width direction from the upstream-side edge position is equal to the specific distance,
wherein the plating adhesion amount controller is configured to calculate the plating adhesion amount estimation value of the first measurement surface portion by using the nozzle-strip distance at a position of the distance sensor when the first measurement surface portion passes the upstream side position, and wherein the movable body control part is configured to move the movable body so that the strip width direction distance between the downstream-side edge position and the plating adhesion amount meter becomes the specific distance when the first measurement surface portion passes the downstream side position.

3. The plating adhesion amount control mechanism according to claim 1 , further comprising:
a movable body configured to move the plating adhesion amount meter in the strip width direction;
a movable body control part configured to control the movable body to move in the strip width direction; and
a strip warp shape calculator configured to calculate a strip warp shape of the steel strip in the strip width direction when the first measurement surface portion passes the upstream side position,
wherein the specific distance is a strip width direction distance of a fixed length fixed preliminarily extending in the strip width direction from the edge position of the steel strip,
wherein the distance sensor comprises a plurality of distance sensors arranged in the strip width direction,

wherein the plating adhesion amount controller is configured to obtain the nozzle strip distance at a position away from the upstream-side edge position by the specific distance of the fixed length by interpolation, based on the strip warp shape, of a plurality of nozzle-strip distances at positions of the plurality of distance sensors when the first measurement surface portion passes the upstream side position, and calculate the plating adhesion amount estimation value of the first measurement surface portion by using the interpolated nozzle-strip distances, and
wherein the movable body control part is configured to move the movable body so that the strip width direction distance between the downstream-side edge position and the plating adhesion amount meter becomes the specific distance of the fixed length.

4. The plating adhesion amount control mechanism according to claim 1 , further comprising:
a strip warp shape calculator configured to calculate a strip warp shape of the steel strip in the strip width direction when the first measurement surface portion passes the upstream side position,
wherein the plating adhesion amount meter is configured to detect the plating adhesion amount at a position at which the distance in the strip width direction from the downstream-side edge position is equal to the specific distance,
wherein the distance sensor comprises a plurality of distance sensors arranged in the strip width direction,
wherein the plating adhesion amount meter is disposed at an absolute position which is determined preliminarily, and
wherein the plating adhesion amount controller is configured to obtain the nozzle strip distance at a position away from the upstream-side edge position by the specific distance by calculating by interpolation a plurality of nozzle-strip distances at positions of the plurality of distance sensors when the first measurement surface portion passes the upstream side position taking into account the strip warp shape, and calculate the plating adhesion amount estimation value of the first measurement surface portion by using the interpolated nozzle-strip distances.

5. The plating adhesion amount control mechanism according to claim 1 ,
wherein the plating adhesion amount meter comprises a plurality of plating adhesion amount meters disposed at positions which are offset in the transferring direction of the steel strip.

6. The plating adhesion amount control mechanism according to claim 1 , wherein the plating adhesion amount controller part is configured to control the nozzle-strip distance, a blow pressure of the gas, and a steel strip passing speed, using the corrected plating adhesion amount estimation expression, so that the plating adhesion amount estimation value becomes equal to the plating adhesion amount actual measurement value.

7. A plating adhesion amount control method for controlling the plating adhesion amount on the steel strip by using the plating adhesion amount control mechanism according to claim 1 , comprising:
blowing the gas onto the steel st

Assignees

• Primetals Tech Japan Ltd

Inventors

• Yonekura Takashi
• Tambara Masao
• Yoshikawa Masashi
• Kanemori Shinya
• Yoshida Kazuki

Classifications

• B05C11/1005

  responsive to condition of liquid or other fluent material already applied to the surface, e.g. coating thickness, weight or pattern · CPC title

• B05D3/042

  Directing or stopping the fluid to be coated with air · CPC title

• B05C11/06

  with a blast of gas or vapour · CPC title

• G05D5/03

  characterised by the use of electric means · CPC title

• B05C11/1021

  responsive to presence or shape of target (B05C11/1018 takes precedence) · CPC title