Method for raising threading steel of push-pull type pickling

Abstract

The invention discloses a method for raising a threading steel of a push-pull type pickling, which comprises the following steps: (1) installing a threading steel coil on a uncoiler, pressing a press roll, and starting the uncoiler so that the front end of the threading steel extends forwards by 250 mm-350 mm; (2) warping by using a stretching hydraulic cylinder and an elevating hydraulic cylinder, wherein the front end of the band steel warps by 10-15%; (3) starting the uncoiler, so that the threading steel enters between pinch rolls of a leveler following a uncoiling guide plate; (4) the front end of the levelled threading steel warps by 3-5 degrees; (5) cutting the strip top at the front end of the threading steel; and(6) threading the threading steel between the squeeze rolls. The invention adds an independent warping procedure to the push-pull type pickling, and thus, can be free from the influences of threading steel thickness and incoming material factors; and after warping, the threading steel can smoothly thread through the leveller. The process from coil feeding to band threading only takes 4 minutes, thereby greatly enhancing the work efficiency and avoiding stacking, clogging, colliding and other accidents of the threading steel in the rinse tank.

Description

technical field [0001] The invention relates to a method for threading strip steel of a pickling unit, in particular to a method for improving the strip steel threading of a push-pull pickling unit. Background technique [0002] Pickling and threading is the first step in the whole pickling production, and the warping of the strip is an important link in the threading process. The purpose of tilting the head is to ensure "the smooth threading of the strip steel, improve the production efficiency of the unit and the service life of the equipment, and reduce the accidents of strip threading". In the previous belt threading process, the quality of the strip warping was often affected, which affected the entire production rhythm. [0003] The pickling unit in the cold rolling mill is a shallow trough turbulent flow push-pull pickling unit. The biggest difference between it and the continuous pickling line is that the continuous pickling line is suitable for a single variety, an...

AI Technical Summary

Problems solved by technology

However, this method has the following disadvantages: 1. It is easy to cause "curl or edge distortion" at the front end of the strip (the two sides of the front end of the strip are not straight, one side is high and the other side is low), and it is easy to occur between the granite in the rinse tank. Collision and hanging phenomenon, resulting in stacking and blocking accidents of strip steel, and low efficiency; 2. Since the lifting or pressing of the straightening machine is driven by a worm gear driven by a motor, the speed is relatively slow, and the height is difficult to control. It needs to be reciprocated until it reaches Qualified head warping, therefore, the efficiency is low, and it also increases the load of the uncoiler motor; 3. It is easily affected by the thickness of the strip steel, and the quality of the warping head is difficult to control, and the front end of the strip steel tends to be too high or too low, curling 4. The process of "straightening and warping" takes about 6 to 10 minutes, and the production of a steel coil of about 17 tons runs at a speed of 70m / min. It takes an average of 16 minutes. The entire steel coil It takes about 22 minutes from "tape threading" to "coiling completion", and the tape threading warping accounts for about 1 / 2 of the whole coil production time, so the operation efficiency is low

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