Hydraulic control system for king roller quick-opening device of pipe mill

Abstract

The invention discloses a hydraulic control system for a king roller quick-opening device of a pipe mill, which relates to an Assel pipe mill. The invention solves the problems in prior art that the speed of the quick-opening is low, accidents easily occur when an upper roller is in low pressure balance state, the location of the upper roller can not be maintained when the pipe mill is stopped, and quick-opening cylinders is lack of security protection. The invention is characterized in that the oil-inlet loops of the three quick-opening cylinders are respectively composed of check valves 21, 22, 23, a direction valve 28, and a one-way throttle valve 29; the oil-drain loops of the three quick-opening cylinders are respectively composed of a direction control cover plate 31, a cartridge valve composed of a direction valve 30 and a cartridge part 32, and an energy accumulator 33; the low-pressure balance loop of the 2# balance cylinder is controlled by the match of a low-pressure balance block composed of a overflow valve3 and a one-way valve 4, with a one-way throttle valve 35; the three quick-opening cylinders are respectively and additionally provided with a safety valve 34.

Description

technical field [0001] The invention relates to a pipe rolling mill equipment, in particular to a hydraulic control system for the main roll of an Assel rolling mill. Background technique [0002] The Assel rolling mill is the production equipment of seamless steel pipes, and is the most important process of metal deformation. It is to put the blank pipes pierced by the piercing machine on the mandrel for elongation and rolling. The current Assel rolling mill is a three-roll cross-rolling mill. When rolling thin-walled pipes, the phenomenon of "tail triangle" is relatively serious, which greatly affects the yield of steel pipes and sometimes causes difficulties in stripping. In order to solve the "tail triangle" problem of rolling thin-walled pipes, the current Assel mills mostly adopt a quick-opening device, that is, at the end of rolling, three rolls or one upper roll are quickly opened by 10-25mm to expand the rolling hole Type, so that the wall thickness of the tail of ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the existing hydraulic control technology, such as the slow quick opening speed and the inability to maintain the original position of the upper roller when the pressure balance is low, to provide a faster quick opening speed and safer hydraulic control system, which shortens the quick opening time. time, improve the "tail triangle" phenomenon of the capillary, and increase the success rate of the capillary

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