Method for controlling speed of cooling roller bed after rolling medium plate

Abstract

The invention discloses a method for controlling the speed of a cooling roller bed after rolling a medium plate, which belongs to the technical field of steel rolling automatic control, is mainly used in the process of cooling the medium plate after rolling, and realizes the control of the cooling uniformity of a steel plate in the length direction by controlling the speed of the roller bed. The invention provides the method for controlling the speed of the cooling roller bed after rolling the medium plate, which can ensure the cooling uniformity of the steel plate in the length direction. The method adopts a cooling control system after rolling and comprises the following steps: firstly, performing sample division on the steel plate in the length direction; secondly, before the steel plate enters an activation cooling zone, acquiring the actual temperature value of the steel plate in the length direction through a thermo-detector before cooling, and determining the speed of each sample of the steel plate to pass through the activation cooling zone; and thirdly, transmitting the speed, determined in the second step, of each sample of the steel plate to pass through the activation cooling zone to a basic automation unit of the cooling control system after cooling, and controlling the speed of the cooling roller bed by the basic automation unit of the cooling control system after cooling.

Description

Technical field: [0001] The invention belongs to the technical field of steel rolling automatic control, and in particular relates to a method for controlling the speed of a cooling roller table after rolling a medium-thick plate; Cooling uniformity control in the length direction. Background technique: [0002] Cooling uniformity control is an important issue in the controlled cooling process of medium and thick plates. In the length direction of the rolled steel plate, there is a phenomenon of uneven temperature distribution. Normally, the temperature at the head and tail of the steel plate is low, and the temperature in the middle is high; at the same time, the pusher type heating furnace is widely used in actual production, resulting in two watermarks with lower temperature on the steel plate body; When entering the cooling area, the temperature of each point on the plate is different when entering the cooling area. These factors will cause the cooling of the steel pla...

AI Technical Summary

Problems solved by technology

Although the above two cooling uniformity controls have improved the cooling uniformity of the steel plate to a certain extent, due to the complex temperature distribution of the steel plate in the length direction, it is difficult to determine the acceleration during micro-acceleration

Moreover, the use of headers to adjust the temperature of low-temperature sections such as steel plate watermarks, head and tail is prone to discontinuity in cooling, because the cost of flow regulating valves in headers is too high and the response time is too long; The impact of fluid impact is relatively large, and flow instability is likely to occur at the moment of opening and closing

Images