The hydraulic cylinder returns to the quick oil discharge circuit

Abstract

The invention relates to an oil return circuit for an oil cylinder, in particular to an oil quick-returning-discharging circuit for an oil cylinder of a hydraulic machine. The oil quick-returning-discharging circuit comprises the oil cylinder and a main reversing valve, wherein the oil cylinder is vertically arranged; the main reversing valve is provided with a first oil outlet, a second oil outlet, an oil inlet and an oil return opening; the first oil outlet of the main reversing valve is connected with the lower cavity of the oil cylinder through an oil pipe; the oil return opening of the main reversing valve is connected with an oil tank through an oil pipe. The oil quick-returning-discharging circuit is characterized in that the lower cavity of the oil cylinder is connected with the oil inlet of the main reversing valve through an oil pipe; the second oil outlet of the main reversing valve is connected with the oil tank through an oil pipe. The oil quick-returning-discharging circuit can achieve the oil quick-returning effect of the oil cylinder of the hydraulic machine under the condition that the diameters of the first oil outlet and the oil return opening of the main reversing valve are not enlarged and no special oil return electromagnetic valve is additionally arranged, so that the manufacturing cost is lowered.

Description

technical field [0001] The invention relates to an oil return circuit of an oil cylinder, in particular to an oil cylinder return rapid oil discharge circuit of a hydraulic machine. Background technique [0002] The hydraulic press usually controls the pressure by controlling the amount of compressed oil in the lower chamber of the cylinder. In order to achieve this control, the lower chamber of the hydraulic press needs to absorb and discharge oil. In order to improve the working efficiency of the hydraulic press, the lower chamber of the hydraulic press usually needs Drain oil quickly. [0003] At present, the oil cylinder of the hydraulic machine in the industry returns to the oil discharge circuit, including the oil cylinder and the main reversing valve. The oil cylinder is arranged vertically; the main reversing valve has a first oil outlet, a second oil outlet, an oil inlet and an oil return port. ; The first oil outlet of the main reversing valve is connected to the ...

AI Technical Summary

Problems solved by technology

However, the calibers of the first oil outlet and oil return port on the main reversing valve are limited by the size of the valve body and cannot be increased indefinitely, and the addition of an oil return solenoid valve specially used for oil return will increase the manufacturing cost of the oil discharge circuit of the hydraulic machine

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