Double-acting prefill valve

Abstract

The invention discloses a double-acting prefill valve, which comprises a double-acting oil cylinder, wherein a protection cover is mounted on the upper part of the double-acting oil cylinder; the double-acting oil cylinder is connected with a valve port device into a whole by a connecting piece; a supporting ring sleeves a piston rod of the double-acting oil cylinder; an oil cylinder reset spring is mounted in a cavity formed by the supporting ring and the valve port device; a press main cylinder is arranged below the valve port device; a flange is used for connecting the prefill valve on the end face of the press main cylinder by a bolt; and under the effect of the double-acting oil cylinder, the prefill valve is reliably closed, and the impact produced by frequent action of a press is reduced, so that the service life of the prefill valve is greatly prolonged. The double-acting prefill valve has the advantages that the structure is compact; the maintenance is convenient; and the work performance of the press is improved. Due to the arrangement of the oil cylinder reset spring, the prefill valve is enabled to be in a close state during non-work time of the press.

Description

technical field [0001] The invention relates to a liquid filling valve for forging equipment in the metal forging machinery industry, in particular to a double-acting liquid filling valve for the main cylinder of a hydraulic press, a flat forging machine and a pipe end thickening machine. Background technique [0002] Hydraulic presses, flat forging machines and pipe end thickening machines generally use plunger cylinders as the main cylinders to achieve large tonnage and fast lifting of the workbench. When working, the main cylinder is driven by the return cylinder to achieve rapid lifting. When it is raised, the oil in the main cylinder needs to be discharged quickly. When it is lowered, a cavity is formed in the main cylinder, which requires a large amount of oil to replenish. valve. In the prior art, the opening of the valve port is driven by hydraulic oil, and the closing is by spring reset. Due to the increase of the working pressure of the press, the impact force of ...

AI Technical Summary

Problems solved by technology

In the prior art, the opening of the valve port is driven by hydraulic oil, and the closing is by spring reset. Due to the increase of the working pressure of the press, the impact force of the liquid-filled valve core will become larger and larger, which will not only cause damage to the valve port of the liquid-filled valve, And it will aggravate the fatigue damage of the return spring, which greatly affects the working performance of the above press

If the return spring of the oil cylinder is damaged, the return spring of the filling valve core will be difficult to overcome the resistance of the piston rod and open the filling valve, thus affecting the normal operation of the press

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