Locking circuit for vertically arranged oil cylinder lower cavity of hydraulic machine

Abstract

The invention relates to a locking circuit for a vertically arranged oil cylinder lower cavity of a hydraulic machine. The lower cavity locking circuit comprises an oil cylinder, an oil tank and an oil pump. The oil cylinder is vertically arranged, an oil outlet is formed in an oil cylinder lower cavity, and the oil tank and the oil pump are connected through an oil pipe. The locking circuit is characterized in that a solenoid valve is arranged between the oil cylinder lower cavity and the oil pump, the solenoid valve is provided with an oil outlet, an oil inlet and an oil return port. The oil outlet of the oil cylinder lower cavity is connected with the oil outlet of the solenoid valve through an oil pipe, and the oil inlet of the solenoid valve is connected with the oil pump through an oil pipe. A ball valve is arranged between the solenoid valve and the oil tank, the ball valve is provided with an oil inlet and an oil outlet, the oil return port of the solenoid valve is connected with the oil inlet of the ball valve through an oil pipe, and the oil outlet of the ball valve is connected with the oil tank through an oil pipe. The locking circuit is low in manufacturing cost, and the valve for the circuit is convenient to disassemble and clean, not prone to damage, little in maintenance time and low in manufacturing cost.

Description

technical field [0001] The invention relates to a hydraulic machine circuit, in particular to a hydraulic machine vertically installed oil cylinder lower chamber locking circuit capable of keeping the weight carried by the hydraulic machine oil cylinder at any position without falling. Background technique [0002] Hydraulic machines with vertically installed cylinders sometimes need to keep the weight suspended on the piston rod of the cylinder at a specific position during use. This is achieved by keeping the oil volume in the lower chamber of the cylinder constant. It is because the lower chamber of the oil cylinder neither enters nor returns oil, closes the oil pump, and locks the lower chamber of the oil cylinder so that the piston in the oil cylinder stops running. In order to achieve this effect, the hydraulic press with vertically installed cylinders needs to design a locking circuit for the lower chamber of the hydraulic press with vertically installed cylinders. ...

AI Technical Summary

Problems solved by technology

However, the price of this two-position three-way electromagnetic ball valve is 3-5 times that of ordinary ball valves, so the manufacturing cost of the hydraulic machine vertically installing the lower cavity of the cylinder to lock the circuit itself is relatively high.

Moreover, when there are particulate impurities in the oil in the circuit, and the particulate impurities enter the position where the spherical valve core of the two-position three-way electromagnetic ball valve is seamlessly matched with the oil return port, a gap will appear at this position, and the oil will flow from the gap. Leakage out of the medium makes the locking circuit ineffective

At this time, it is necessary to disassemble, wash and maintain the two-position three-way electromagnetic ball valve, but the disassembly and assembly of this kind of ball valve is very cumbersome, and the disassembly and assembly time is relatively long, which increases the maintenance time.

This kind of ball valve is very easy to cause damage to the valve core during disassembly and assembly. Once damaged, it needs to be replaced, which increases the maintenance cost.

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