Roller change method avoiding damage of walking wheels of working roller

Abstract

The invention provides a roller change method avoiding damage of walking wheels of a working roller. A roller gap position control program and a roller diameter storage, comparison and calculation module are added in a TDC (top dead center); when a roller is changed, a lower working roller falls into a reserved roller gap position, then an upper working roller falls onto the lower working roller, after an inclined wedge is arranged, the upper working roller is lifted, the lower working roller is lifted to the position of the reserved roller gap plus the difference value of a new roller and an old roller after the roller is changed, the upper working roller falls onto the lower working roller, and after the upper working roller bursts into the inclined wedge, the upper working roller and an upper bearing roller are lifted together. According to a weight pressed onto each part of the roller system of a hydraulic cylinder support rack, the weight of the bearing roller is decomposed, so that the pressure of walking wheels of the bearing housing of the working roller is decreased, the damage of walking wheels of the working roller is prevented, the period in use of the walking wheels are prolonged, the workload of maintenance and consumption of spare parts are reduced, cost on maintenance and production is lowered, time of the roller change is shortened, and productivity of a set is improved.

Description

technical field [0001] The invention belongs to the field of steel rolling machinery equipment, and in particular relates to a method for changing rolls of a cold rolling mill which can prevent damage to running wheels of work rolls during the roll changing process. Background technique [0002] At present, there are two running wheels on both sides of the work roll bearing box of the domestic 2130 mm cold rolling unit, which are used for the push-pull movement of the work roll during the roll change process. Wedge, when the balance of the upper back-up roll falls, because the balance cylinder rod of the back-up roll is too long, the weight of the upper back-up roll (about 40 tons) directly presses on the bearing box of the upper work roll, and the running wheels of the bearing box are in direct contact with the track. Small but strong pressure, resulting in excessive force between the traveling wheel and the track, causing the traveling wheel to deform and damage. After th...

AI Technical Summary

Problems solved by technology

[0002] At present, there are two running wheels on both sides of the work roll bearing box of the domestic 2130 mm cold rolling unit, which are used for the push-pull movement of the work roll during the roll change process. Wedge, when the balance of the upper back-up roll falls, because the balance cylinder rod of the back-up roll is too long, the weight of the upper back-up roll (about 40 tons) directly presses on the bearing box of the upper work roll, and the running wheels of the bearing box are in direct contact with the track. Small but strong pressure, resulting in excessive force between the traveling wheel and the track, causing the traveling wheel to deform and damage

After the new work roll enters the frame, the rolling line is calibrated for the opening of the wedge, the balance of the upper back-up roll drops again, and the entire weight of the upper back-up roll is completely pressed on the bearing box of the new work roll, which also causes damage to the running wheel of the new roll. After such repeated stamping twice, the 8 running wheels of the upper work roll are basically damaged. In severe cases, the bearing box of the work roll will be stuck, so that the roll change of the work roll cannot be carried out normally, and the processing time is longer, which affects the roll change time of the unit. and the operating rate of the unit. At the same time, the long-term shutdown of the unit will lead to overwashing of the steel plate in the pickling section, resulting in a large number of waste products and hidden dangers of belt breakage

Although measures such as changing the structural strength and material of the traveling wheel have been taken many times, there is no obvious effect