A multi-channel composite control liquid filling device for presses

Abstract

The invention relates to a multi-runner compound-control compressor charging device, which is characterized by comprising a valve core, a valve body and a compound oil cylinder, wherein the valve body is installed in a valve cavity, a gap between the valve body and the outer wall of the valve cavity is an outer charging channel, and a valve on the valve body closes the channel; the valve core is installed in the valve body, and through-hole-shaped center runners are formed in the valve body of the lower end of the valve core; hole-shaped drainage channels are formed in the valve body of the periphery of the valve core; the compound oil cylinder is provided with a plurality of cavities, and the cavities at two ends are respectively an upper rod cavity and a lower rod cavity; the upper piston rod of the upper rod cavity is fixedly connected with the valve body, and the lower piston rod of the lower rod cavity is fixedly connected with the valve core; through the driving of the lower piston rod of the compound oil cylinder, the valve core is lifted up, the center runners and the drainage channels form an inner charging channel; and through the driving of the lower piston rod of the compound oil cylinder, the valve body moves down, the valve is opened, and the outer charging channel is opened. The multi-runner compound-control compressor charging device has the advantages that the system work is quicker, the unloading impact is avoided, the stability is strong, and the safety is high.

Description

technical field [0001] The invention relates to a liquid filling device for a hydraulic system of a press, in particular to a multi-channel composite control liquid filling device for a press. Background technique [0002] In large-tonnage hydraulic presses, the filling device (especially the filling valve) is one of the core components to ensure high-efficiency pressing and high productivity. When the movable crossbeam goes down quickly, the oil in the low-pressure filling tank quickly flows into the main cylinder through the device; when the movable crossbeam quickly returns, the high-pressure oil in the piston chamber of the main cylinder is quickly discharged into the low-pressure filling tank through the device. The fast forward, pressure maintaining, pressure relief and return of the main cylinder must be completed with the participation of the liquid filling device. Therefore, the structure of the liquid filling device and the shape of the flow channel are important t...

AI Technical Summary

Problems solved by technology

For large-flow compressors, the size of the liquid-filled spool often increases with the increase of the flow rate, but the large-area spool becomes the main obstacle blocking the flow of oil, and the further improvement of the filling speed encounters a bottleneck

[0005] 2) Insufficient stability of the high-pressure cylinder during the rapid return process

This method increases the cost and the system is complicated. If the electronic control error causes the liquid filling device to open under high pressure, it will cause serious damage

A pilot spool with a damping hole is added inside the liquid filling device (for example, refer to patent 200520069161.2), which avoids the adverse effects caused by the external pressure relief stage and improves the rapidity of the return stroke of the main cylinder, but there are problems such as poor controllability of the unloading pressure, Insufficient pressure relief stability and other issues

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