Flow and pressure control device of hydraulic machine

Abstract

The invention discloses a flow and pressure control device of a hydraulic machine. The device comprises a valve body, an upper rotating groove is formed in the upper end of the valve body, and a lowerrotating groove is formed in the lower end of the valve body. An upper end cover is fixedly mounted at the upper end of the upper rotating groove of the valve body, and a lower end cover is fixedly mounted at the lower end of the lower rotating groove. A port P is formed in the upper end cover, and a port A and a port T are formed in the lower end cover. A shaft rod is arranged in the valve body.A first valve element is rotationally connected to the interior of the upper rotating groove, and a second valve element is rotationally connected to the interior of the lower rotating groove. A first through hole is formed in the first valve element, an upper dovetail groove is formed in the bottom of the upper rotating groove, a lower dovetail groove is formed in the top of the lower rotating groove, and a second through hole is formed in the valve body. A screw plug is arranged in the second through hole, and a throttling hole is formed in the screw plug. A third through hole is formed inthe second valve element. An overflow valve assembly is fixedly installed on the side face of the lower end cover. The flow and pressure control device of the hydraulic machine is simple in structure,compact, and low in manufacturing cost.

Description

technical field [0001] The invention belongs to the technical field of hydraulic machines, and in particular relates to a flow and pressure control device of a hydraulic machine. Background technique [0002] Hydraulic press is an important molding equipment. The hydraulic pump is driven by an electric motor to generate high-pressure liquid, and the hydraulic cylinder generates linear motion for work. Due to the wide adaptability of hydraulic machining, it is widely used in metal and non-metal forming and processing occasions. During the working process of the hydraulic press, it is generally divided into three processes: the master cylinder idling fast-forward, the master cylinder slow-speed working and the pressure maintaining. The speed and pressure of the hydraulic press are controlled by the control of the hydraulic components. The current hydraulic press mainly has the following problems: the hydraulic control system is complex, which increases the cost and failure rat...

AI Technical Summary

Problems solved by technology

During the working process of the hydraulic machine, it is generally divided into three processes: the main cylinder idle fast forward, the main cylinder slow work forward and the pressure holding process. The speed and pressure of the hydraulic machine are controlled by the control of the hydraulic components. The current hydraulic machine mainly has the following problems: the hydraulic control system is complex, which increases the cost and failure rate; the structure is complex, the energy loss is serious, and the transmission efficiency is low.

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