Method for preventing thin-specification strip steel from flying into coiling machine when tail losses tension

Abstract

The invention relates to the technical field of strip steel coiling, in particular to a method for preventing thin-specification strip steel from flying into a coiling machine when the tail losses tension. The method for preventing the thin-specification strip steel from flying into the coiling machine when the tail losses tension comprises the steps that a position sensor used for monitoring a pinch roll seam width real-time actual value Dt in real time is installed on the coiling machine, and the position sensor is in electric signal connection with a PLC; when the thickness of the strip steel coiled by the coiling machine is smaller than or equal to 3.9 mm, a pinch roll seam width initial setting value D0 and a pinch roll pressure initial setting value P0 obtained at the moment (when the head of the strip steel is in contact with a coiling block of the coiling machine at the first time) when a coiling block load relay is switched on at the first time are memorized by the PLC; and the pinch roll seam width real-time actual value Dt obtained after the coiling block load relay is switched on at the first time by 2 seconds is memorized by the PLC in real time, when Dt-D0>=1, a pinchroll pressure real-time setting value is modified into 2P0, and when Dt-D0<1 or the whole strip steel is coiled on the coiling block, the pinch roll pressure real-time setting value is modified intoP0.

Description

technical field [0001] The invention relates to the technical field of strip steel coiling, in particular to a method for solving the problem that the tail of a thin-gauge strip steel loses tension and flies into a coiler. Background technique [0002] Since the thin-gauge strip steel (thickness of the strip steel is less than or equal to 3.9mm) is coiled by the hot continuous rolling coiler, due to the abnormal shape of the incoming material for finishing rolling, when the head of the strip steel hits the pinch roll, the pinch roll gap is closed after springing If it does not come back, the pinch rollers will not clamp the strip tightly. After the finishing stand throws steel, the tail of the strip loses tension between the reel and the pinch roller, and the tail of the strip is controlled to exit the tension ring and turn into the speed ring. , the speed suddenly rises and flies into the coiler, commonly known as the "flying car" at the tail of the strip. This situation l...

AI Technical Summary

Problems solved by technology

This situation leads to a decline in the good rate of roll shape, severe tail cuts, and reduced product quality

In view of the "running" phenomenon of thin-gauge strip steel, if simply increasing the pressure setting value of the pinch roll during the load period, it will cause stacking faults in the steel coil and damage the coil shape.

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