Heavy reduction withdrawal and straightening machine of billet caster, and withdrawal and straightening machine hydraulic control system and control method

Abstract

The invention relates to the field of metallurgical equipment, in particular to a heavy reduction withdrawal and straightening machine of a billet caster, and a withdrawal and straightening machine hydraulic control system and control method. A displacement sensor is arranged in each withdrawal-and-straightening-machine servo hydraulic cylinder, and hydraulic loops of a piston cavity and a rod cavity of each servo hydraulic cylinder are connected with pressure sensors respectively. The two withdrawal-and-straightening-machine servo hydraulic cylinders are used for controlling the lifting and down pressing of an upper roller of the heavy reduction withdrawal and straightening machine, a heavy reduction balance cylinder is used for lifting the upper roller of the withdrawal and straighteningmachine, the heavy reduction balance cylinder adopts the pressure reduced by connecting the rod cavity with a three-way pressure reducing valve, the pressure of the three-way pressure reducing valveis set, it is guaranteed that the upper roller of the heavy reduction withdrawal and straightening machine makes tight contact with the piston rod ends of the two withdrawal-and-straightening-machineservo hydraulic cylinders all the time, the pressure sensors are used for compensating for equipment gaps and equipment deformation in the working process of the heavy reduction withdrawal and straightening machine, and the needed equipment control precision is achieved.

Description

technical field [0001] The invention relates to the field of metallurgical equipment, in particular to a heavy-pressure down-draw leveler for a billet continuous casting machine, a hydraulic control system and a control method for the draw-leveler. Background technique [0002] The internal quality problems of internal center segregation, center porosity and shrinkage cavity are common in billet continuous casting machines, resulting in certain quality defects of continuous casting slabs. Continuous casting machine light reduction technology can effectively solve the problem of internal center segregation of continuous casting slabs. However, little effect has been achieved for the problems of porosity and shrinkage cavities inside the continuous casting slab. In order to solve the problems of looseness and shrinkage cavity inside the continuous casting slab, a continuous casting production process under heavy pressure with high continuous casting quality and high production...

AI Technical Summary

Problems solved by technology

[0003] The drawing and leveling machine of the billet continuous casting machine is usually controlled by one hydraulic cylinder of the drawing and leveling machine to realize the function of heavy reduction. Due to the heavy reduction process, the maximum reduction of a single roller is about 20mm, and the casting slab at the heavy reduction position has already solidification, so the compression force of the tension leveler is very large, which makes the specification of the hydraulic cylinder of the tension leveler required by the equipment also large, thereby increasing the size of the tension leveler equipment itself, and at the same time, one hydraulic cylinder of the tension leveler is easy to cause heavy pressure Slab deviation during down process

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