Method for preventing tail part of band steel from loop rising in front of coiling machine

Abstract

The invention discloses a method for preventing the tail part of band steel from loop rising in front of a coiling machine. The method is realized by the following manners: firstly, the water amount of a laminar cooling upper collection pipe is increased so that the temperature of the tail part of the band steel is reduced to 650 DEG C; when the temperature of the tail part of the band steel is reduced, a downward impact force of a water flow is used for enhancing the fitting degree of the band steel and a roller way so as to increase the friction force between the roller way and the band steel and enable the speeds of the band steel and the roller way to be synchronized; secondly, the speed of finish rolling and steel polishing is controlled to be lower than 10m / s; thirdly, deceleration time of each section of a hot conveying roller way, a coiling machine inlet roller way and a front clamping roller of the coiling machine is increased gradually and sequentially from a finish rolling outlet to a coiling machine inlet; the deceleration non-synchronization caused by the condition that the properties of roller way transmission equipment are different is avoided by increasing the speed difference of all the sections of the hot conveying roller ways; the method disclosed by the invention has the advantages that a phenomenon of the loop rising of the tail part of thin steel in front of the coiling machine can be avoided effectively so that the product quality and the yield are improved.

Description

technical field [0001] The invention is mainly applied to the strip steel hot continuous rolling project, and is a method for solving the problem that the tail of the strip steel (mainly thin steel with a thickness below 2.0mm) is sheathed before the coiler. Background technique [0002] In the hot strip rolling production line, the hot-feeding roller table is located between the finishing unit and the coiler, which belongs to the strip cooling zone. The hot-feeding roller table has multiple sections, and the speed can be controlled in sections. The strip is conveyed from the finish rolling exit to the coiler entrance roller table through the hot delivery roller table, and then enters the coiler with the assistance of the front pinch roll (including the upper pinch roll and the lower pinch roll) of the coiler. Machine rolled into finished steel coils. The laminar flow cooling device is installed in the hot delivery roller table area, and the strip is cooled from the final r...

AI Technical Summary

Problems solved by technology

When the strip is thrown out from finishing rolling, the tension at the tail of the strip is only provided by the friction between the strip and the roller table, and the thin steel itself has a small weight and the friction between the roller table is also small, so the tension that can be provided is small, resulting in Insufficient tension at the tail, so that the thin steel cannot fully fit the roller table on the roller table, resulting in the speed of the thin steel and the roller table speed not being completely synchronized, making the tail speed of the strip higher than the front speed, causing the tail of the strip to sheave

For thin steel, the rolling speed of thin steel is high, and the speed of throwing steel for finishing rolling is also high. Due to the inertia, the speed of the tail of the thin steel is higher than the speed of the strip at the front, which eventually causes the steel tail to shed on the roller table. The higher the speed , the thinner the strip steel, the more serious the sheathing phenomenon will be, resulting in bulging of the steel tail or even overlapping of the strip, causing scratches on the strip steel and folding at the tail during coiling, which seriously affects the quality of the finished product

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