A method of independent partition control suitable for roller-disk cooling bed

Abstract

The invention discloses a separate sub zone control method applicable to a roll and disc-type cooling bed, belonging to the field of control. The cooling bed is the roll and disc-type cooling bed; the working zone of the whole cooling bed is divided into a plurality of sub zones; the cooling bed is subjected to partitioned detection; the number of steel plates which can be accommodated by each separate zone is calculated by a PLC program according to the width of supplied steel plates; models are set according to material distribution conditions at target zones of the cooling bed and cooling temperature required by the steel plates; and the operation modes of the zones are automatically selected, so that the utilization rate of the cooling bed is improved. By utilizing the device, the steel plates of different cooling models during a thermal treatment process can be simultaneously subjected to classified cooling treatment; the phenomenon of a low utilization rate caused by integral control of a conventional cooling bed can be effectively avoided; the waiting time for the steel plates to be loaded to or unloaded from the cooling bed is reduced; and therefore the steel plates of different specifications can be cooled on the cooling bed according to the respective cooling temperature control models, so that the utilization rate and control flexibility of the cooling bed are greatly improved. The separate sub zone control method can be widely applied to the field of cooling control of the cooling bed during a large-scale continuous production process of a thermal treatment line.

Description

technical field [0001] The invention belongs to the field of control, in particular to a cooling bed temperature control method used in large-scale continuous production of a heat treatment line. Background technique [0002] In the production process of the heat treatment line of the thick plate factory under the jurisdiction of the applicant, the steel plates heated by the heat treatment furnace or quenched are naturally cooled on the cooling bed, and then collected or transported after the temperature meets the requirements. [0003] As the outlet equipment of the heat treatment furnace, the cooling bed forms an independent heat treatment production line with the heat treatment furnace and its inlet equipment, and the subsequent straightening and other processes belong to another independent production line. Therefore, the natural cooling (air cooling) of the steel plate on the cooling bed The time and collection temperature are not strictly technical requirements. [00...

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Problems solved by technology

[0006] 1. The direction of transportation is single: the steel plate on the cooling bed can only be transported forward automatically through the periodic movement of the walking beam;

[0007] 2. The control method is simple: limited by the mechanical structure, the cooling bed must be operated as a whole and cannot be divided into partitions, that is, when the walking beam moves forward, all the steel plates on the cooling bed are forwarded and transmitted at the same time;

[0008] 3. The cooling temperature cannot be controlled: L1 automatic control system when the steel plate enters and is transported out of the cooling bed (in the applicant enterprise, it is customary to call the level 1 PLC for basic automatic control as L1, and the level 2 PLC for process management as L1 L2, the same below) uses the traditional "first in, first out" queue mode, and whether the required cooling temperature is reached is confirmed by the operator, without automatic process computer control, and it is impossible to realize the temperature control model

[0012] In practical application, there is no cooling bed cooling control method that is suitable for independent control of a single area after the hot rolling heat treatment heating process, and can meet the temperature drop requirements of different steel plates at the same time

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