Pressure-maintaining and regulating hydraulic control system of roll balance gear

Abstract

The invention discloses a pressure-maintaining and regulating hydraulic control system of a roll balance gear and relates to a hydraulic control system of a steel rolling machine. The pressure-maintaining and regulating hydraulic control system solves the problems of unreliable pressure maintenance, inconvenient equipment debugging and no pressure protection of a control loop in the prior art. The pressure-maintaining and regulating hydraulic control system is characterized in that: a hydraulic control loop comprises a pressure-maintaining loop of the roll balance gear and an adjusting loop of the roll balance gear; the pressure-maintaining loop is formed by connecting a pressure-reducing valve 11, an I-number electromagnetic directional valve 12, an energy accumulator 16, a safety valve 17, an I-number pressure meter 15, an II-number pressure meter 18 and a hydraulic oil pipe according to the conventional connecting method; the adjusting loop is formed by connecting an II-number electromagnetic directional valve 19, a one-way throttle valve 13, a pressure relay 14, a hydraulic locking valve 20, an overflow valve 21 and the hydraulic oil pipe according to the conventional connecting method; and the pressure-maintaining loop and the adjusting loop are separated and associated by using a hydraulic one-way valve 22 and a one-way valve 23.

Description

technical field [0001] The invention belongs to a hydraulic control system of a steel rolling machine, in particular to a hydraulic control system that needs to be pressed and maintained during the rolling process and adjusted in a non-rolling state in the steel rolling equipment. Background technique [0002] In steel rolling machinery and equipment, many roll balancing devices are hydraulically controlled, which need to be pressed and maintained in the rolling state. When the roll is installed for the first time or a new roll is replaced, pressure adjustment and position adjustment control are required. For example, the balance device of the roll in the steel pipe rolling mill and the balance device of the upper roll in the straightening machine are all hydraulic control mechanisms, which need to be pressed and maintained during rolling, and adjusted and controlled in the non-rolling state. [0003] The roll balance device in the steel pipe rolling mill such as figure 1 S...

AI Technical Summary

Problems solved by technology

This control circuit basically meets the pressure maintaining and adjustment requirements of the roll device, and the adjustment and pressure maintaining share a control circuit, which has disadvantages: No. 1 electromagnetic reversing valve 12 is a two-position four-way spring return reversing valve, and the balance hydraulic cylinder 1 is in the In the roll balance device, when the piston rod 3 drives the roll device to run to the rolling center line, it must run a full stroke every time, and there is no pause function in the middle of the stroke, which brings inconvenience to equipment debugging; although there is an accumulator 16 in the control circuit to provide Supplement the oil source. If the hydraulic station stops running for a long time, the pressure in the piston rod chamber of the balance cylinder 1 will also leak, and the precise position of the roll device cannot be guaranteed, which will affect the rolling hole shape; during the rolling process of the steel pipe, due to The effect of the rolling force may cause the pressure in the piston rod chamber of the balance cylinder 1 to increase, causing the connecting oil pipe of the hydraulic cylinder to rupture or damage other equipment. There is no pressure protection function, which may cause accidents

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