Simple pressure regulation and stable unloading device for hydraulic system oil return

Abstract

The invention relates to a simple pressure regulating and stable unloading device used for oil return of a hydraulic system. The simple pressure regulating and stable unloading device comprises a counter bore with a thread on an oil cylinder base, an oil drainage hole communicated with an oil cylinder is formed in the center of the bottom part of the counter bore, a steel ball is installed in an opening of the oil drainage hole in the bottom part of the counter bore, a switch handle is screwed into the counter bore, the front end of the switch handle reaches against the steel ball, an oil return hole communicated with the oil tank is formed in the side surface of a screwed thread section of the switch handle, the switch handle is screwed in or out to enable the front end of the switch handle to press against the steel ball or release the steel ball to open or close the oil drainage hole, an opening of the oil return hole faces the thread position of the switch handle at the closing state, the opening of the oil return hole faces the position between the thread position of the switch handle and a thread head smaller than the outer diameter of the thread at the opened oil return state, the simple pressure regulating and stable unloading device is characterized in that a thread sleeve is screwed on the thread at the front end of the counter bore, and the front end of the switch handle is formed in a way that a cylinder rod is inserted into an inner hole of the thread sleeve to form an annular oil drainage gap.

Description

technical field [0001] The invention relates to a hydraulic flow regulating device, in particular to a simple pressure regulating and stabilizing unloading device for oil return in a hydraulic system. Background technique [0002] In the hydraulic system, some equipment or tooling often need to control the speed of the retraction process after the cylinder is extended, especially slowly. One is to effectively control the distance of the cylinder retraction, and the other is to prevent the retraction Shrink too fast and cause excessive impact force and cause damage to the machine parts. For example, the jack is the most commonly used hydraulic tool or device. When the jack needs to be unloaded or the extended oil cylinder needs to be retracted after lifting the weight with the jack, the locked oil return switch (switch handle) is opened. Under the action of gravity, the oil in the oil cylinder returns to the oil tank through the oil return hole. In many occasions, it is nec...

AI Technical Summary

Problems solved by technology

However, during use, the orifice will adhere to the orifice due to impurities in the oil or the polarized molecules of the oil, colloid, asphalt and other parts precipitated after oxidation, thereby changing the original flow area, causing the flow rate to change or even The orifice is blocked, which affects the control of the oil return flow

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