Working roller bending device for double-roller rolling machine and roller bending force control method

Abstract

The invention discloses a working roller bending device for a double-roller rolling machine and a roller bending force control method. The rolling machine comprises an arch, a working roller and a supporting roller. The roller bending device comprises a roller bending mechanism for supplying a roller bending force to the working roller; the roller bending mechanism is provided with roller bending blocks and a roller bending beam, wherein the roller bending block are fixedly mounted in a window of the arch and symmetrically arranged at two sides of a working roller bearing block; a piston rod and an end cover are arranged at two ends of each roller bending block; the roller bending blocks, the piston rods and the end covers form a roller bending hydraulic cylinder; the piston rods act on the roller bending beam. According to the roller bending device, a fixed single oil cylinder is adopted according to the structure, and micro differential pressure control is performed; compared with the prior art, the roller bending device has the advantages that the capacity is fully utilized, the maintenance points are few, and the quantity of the oil cylinders is decreased.

Description

technical field [0001] The invention belongs to the field of plate / strip hot rolling, and relates to a work roll bending device and a roll bending force control method of a four-high rolling mill, and is particularly suitable for rolling mills requiring axial roll shifting of work rolls. Background technique [0002] In the field of plate / strip hot rolling, the work roll bending device is an important device for shape control, and its bending force is applied to the work roll chock by a hydraulic cylinder. However, in rolling mills that require axial shifting of the work rolls, in order to ensure that the roll bending force always acts on the center of the roll bearing under the shifting state, patents CN201320204637. CN200710203401.7 discloses a differential pressure control scheme for fixed double oil cylinders. [0003] Although the above-mentioned scheme has also solved the problem of the eccentric load of the work roll bearing, it has brought new problems at the same t...

AI Technical Summary

Problems solved by technology

Under the maximum roll shifting stroke in the positive direction, in order to ensure that the resultant force of the two oil cylinders acts on the bearing center, the oil cylinder close to the bearing center of the work roll must bear 90% of the roll bending force; while under the maximum roll shifting stroke in the reverse direction, the The oil cylinder is far away from the center of the work roll bearing, and only needs to bear 10% of the bending force. Therefore, the size design of the oil cylinder and the selection of the valve must consider the working condition of the maximum load, resulting in a waste of the capacity of the oil cylinder size and valve.

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