Thin material threading control method for guide rulers of hot rolling coiler

Abstract

The invention provides a thin material threading control method for guide rulers of a hot rolling coiler. The method comprises the following steps of: additionally arranging a pressure sensor, and additionally arranging an analog quantity input plate and a corresponding program in a PLC (Programmable Logic Controller); when steel is fed through a second frame, setting the opening degrees of the guide rulers by using a secondary computer: when the head part of a steel strip arrives at the middle position of each guide ruler, controlling to start up a primary short stroke and a second short stroke in sequence on the working sides and transmission sides of the guide rulers by using the PLC; judging whether the WS clamping force feedback on the working sides of the guide rulers is more than or equal to 7KN and can last for 50 milliseconds or not at the moment after, and if so, directly switching to a guide ruler working side pressure automatic control way; otherwise, setting a third short stroke: if the working sides of the guide rulers never meet a switching condition, directly switching to an AFC (Automatic Frequency Control) way after the third short strokes of the working sides of the guide rulers are completed. Due to the adoption of the method, the 'inner tower' phenomenon and head cutting loss of a steel coil can be eliminated, the total sealing rate is controlled to be below 1.8 percent, the hot rolling coiling quality is improved greatly, and rolling yield is increased greatly, and the recoiling quantity of sub-coils is reduced by over 30 percent.

Description

technical field [0001] The invention belongs to the technical field of steel rolling technology, and in particular relates to a method for controlling thin strip threading of a guide rule of a hot rolling coiler. Background technique [0002] There is a pair of guide rules in front of each coiler for hot-rolled strip steel, which are used to clamp the steel plate to ensure that the centerline of the steel plate coincides with the centerline of rolling as much as possible. The closer the two centerlines coincide, the more stable the centerline of the strip steel will be. The better the coil shape is, especially when the thin material is threaded, the clamping speed of the guide bar plays a key role in the tower shape of the coil head. [0003] The strip threading speed of the hot-rolled sheet coiler reaches 12m / s, and the guide bar starts to move when the head of the strip steel reaches the middle position of the guide bar (the guide bar HMD). AFC) mode, until the guide rule...

AI Technical Summary

Problems solved by technology

Therefore, in the production of steel strips with specifications of 3.0mm and below, about 30% of the steel strips have a serious "inner tower" phenomenon at the head after coiling, and need to be divided into coils and recoiled, and even about 1% of the steel coils have a head About 10-50m is cut off as waste products, which has a major impact on the quality, yield and cost control of hot-rolled finished products

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