Control device for cooling apparatus

Patent metadata

Field	Value
Publication number	US-12157156-B2
Application number	US-202118003348-A
Country	US
Kind code	B2
Filing date	Jun 15, 2021
Priority date	Jun 15, 2021
Publication date	Dec 3, 2024
Grant date	Dec 3, 2024

Abstract

In preset calculation, a plurality of cooling banks are set to be feedforward or feedback banks, and each of water injection amounts in these banks is calculated. In cooling history management, a recalculation position for re-executing the feedback calculation is set. In feedback calculation, a temperature correction value for compensating a delay due to a conveyance time period from a position of the feedback bank to a position of a delivery side pyrometer, and a response delay of the feedback bank is calculated, when a segment reaches the recalculation position. In the feedback calculation, each of water injection amounts in the feedback banks that is calculated in the preset calculation is changed for each of segments based on a delivery side temperature target value, a delivery side temperature actual value calculated for each of the segments, a delivery side temperature prediction value that is recalculated, and the temperature correction value.

First claim

The invention claimed is:

1. A control device for a cooling apparatus that is provided at a rolling line and is configured to cool a material to be rolled by a plurality of cooling banks,
wherein the control device is configured to control each of water injection amounts in the plurality of cooling banks such that a delivery side temperature target value indicating a target temperature of the material to be rolled at a position of a delivery side pyrometer provided at a delivery side of the cooling apparatus corresponds to a delivery side temperature actual value indicating an actual temperature of the material to be rolled that is measured by the delivery side pyrometer,
wherein, in the control of each of the water injection amounts in the plurality of cooling banks, the control device is configured to perform preset calculation, cooling history management, feedforward calculation, and feedback calculation,
wherein, in the preset calculation, the control device is configured to:
set each of the plurality of cooling banks to be a feedforward bank for performing feedforward control of the water injection amount, or a feedback bank for performing feedback control of the water injection amount, the feedback bank being at least one cooling bank that is allocated in order from a downstream side in the rolling line according to the material to be rolled, the feedforward bank being a remaining cooling bank;
calculate a delivery side temperature prediction value indicating a predicted temperature of the material to be rolled at the position of the delivery side pyrometer; and
calculate each of the water injection amounts in the plurality of cooling banks such that the delivery side temperature prediction value corresponds to the delivery side temperature target value,
wherein, in the cooling history management, the control device is configured to:
grasp a position of the material to be rolled for each of segments indicating one section at a time of dividing the material to be rolled into a virtual length in a conveyance direction; and
store a cooling history including an actual speed of the material to be rolled at each of positions of the plurality of cooling banks, and a history of each of the water injection amounts in the plurality of cooling banks, for each of the segments,
wherein, in the feedforward calculation, the control device is configured to:
calculate the delivery side temperature prediction value for each of the segments, based on an entry side temperature actual value indicating an actual temperature of the material to be rolled at a position of an entry side pyrometer provided at an entry side of the cooling apparatus, and a speed of the material to be rolled at the position of the entry side pyrometer; and
change each of the water injection amounts in the feedforward banks that are calculated in the preset calculation, based on a difference between the delivery side temperature target value, and the delivery side temperature prediction value calculated for each of the segments,
wherein, in the feedback calculation, the control device is configured to calculate a difference between the delivery side temperature actual value and the delivery side temperature target value for each of the segments,
wherein, in the cooling history management, the control device is further configured to set a recalculation position for re-executing the feedback calculation, the re-calculation position being located at an upstream side in the rolling line from a position of the feedback bank by a distance corresponding to a response delay of the feedback bank,
wherein, when a segment reaches the recalculation position, the control device is further configured to perform recalculation of the delivery side temperature prediction value for the segment that reaches the recalculation position, based on the cooling history, and
wherein, in the feedback calculation, the control device is further configured to:
when the segment reaches the recalculation position, calculate a temperature correction value for compensating a delay due to a conveyance time period from the position of the feedback bank to the position of the delivery side pyrometer, and a response delay of the feedback bank; and
change each water injection amount in the feedback bank calculated in the preset calculation for each of the segments, based on the delivery side temperature target value, the delivery side temperature actual value calculated for each of the segments, the recalculated delivery side temperature prediction value, and the temperature correction value.

2. The control device for a cooling apparatus according to claim 1 ,
wherein the control device is further configured to perform a calculation of a predicted speed of the material to be rolled,
wherein, in the recalculation, the control device is configured to:
calculate a temperature drop actual value of the material to be rolled that is conveyed from the position of the entry side pyrometer to the recalculation position for each of the segments, based on the cooling history from the position of the entry side pyrometer to the recalculation position;
calculate a temperature drop prediction value of the material to be rolled from the recalculation position to the position of the delivery side pyrometer for each of the segments, based on the predicted speed, and each of the water injection amounts in the plurality of cooling banks obtained by the preset calculation; and
calculate the delivery side temperature prediction value, based on the temperature drop actual value, and the temperature drop prediction value.

3. The control device for a cooling apparatus according to claim 2 ,
wherein a predetermined cooling pattern is applied to each of the water injection amounts in the feedforward banks,
wherein, in the feedforward calculation, the control device is configured to change each of the water injection amounts in the feedforward banks within a range of the predetermined cooling pattern.

4. The control device for a cooling apparatus according to claim 3 ,
wherein a predetermined cooling pattern is applied to each of the water injection amounts in the feedforward banks,
wherein the control device is further configured to:
perform determination of whether or not the water injection amount in the feedback bank approaches a maximum water injection amount or a minimum water injection amount, for each of the feedback banks; and
transfer water injection or stop of water injection in the feedback bank to the feedforward banks within a range of the predetermined cooling pattern, when it is determined that the water injection amount in the feedback bank approaches the maximum water injection amount or the minimum water injection amount.

5. The control device for a cooling apparatus according to claim 2 ,
wherein a predetermined cooling pattern is applied to each of the water injection amounts in the feedforward banks,
wherein the control device is further configured to:
perform determination of whether or not the water injection amount in the feedback bank approaches a maximum water injection amount or a minimum water injection amount, for each of the feedback banks; and
transfer water injection or stop of water injection in the feedback bank to the feedforward banks within a range of the predetermined cooling pattern, when it is determined that the water injection amount in the feedback bank approaches the maximum water injection amount or the minimum water injection amount.

6. The control device for a cooling apparatus according to claim 1 ,
wherein a predetermined cooling pattern is applied to each of the water injection amounts in the feedforward banks,
wherein, in the feedforward calculation, the control device is configured to change each of the water i

Assignees

• Toshiba Mitsubishi Electric Industrial Systems Corp
• Tmeic Corp

Inventors

• Kitagoh Kazutoshi
• Imanari Hiroyuki
• Shimoda Naoki
• Okano yuki
• Takagi Sanga

Classifications

• B21B37/44

  using heating, lubricating or water-spray cooling of the product · CPC title

• B21B2275/06

  Product speed · CPC title

• B21B38/006

  for measuring temperature · CPC title

• Y02P70/10

  Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working · CPC title

• B21B37/74 Primary

  Temperature control, e.g. by cooling or heating the rolls or the product (B21B37/32, B21B37/44 take precedence) · CPC title