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[CN 201620904888.6] return hydraulic cylinder with vacuum boosting function on forging hydraulic press
[CN 201620904888.6] Title of a return hydraulic cylinder with vacuum boosting function on a forging hydraulic press: Application number of a return hydraulic cylinder with vacuum boosting function on a forging hydraulic press: CN 201620904888.6 Applicant: Application date of China Juxin Offshore Engineering Equipment Co., Ltd.: 2016-8-19 Patent Type: Utility Model The utility model relates to a return hydraulic cylinder with vacuum boosting function on a forging hydraulic press, including hydraulic cylinder body, piston and piston rod. The rodless cavity of the hydraulic cylinder is a closed structure. When the movable beam goes down, negative pressure is formed in the rodless cavity, pressure oil enters the rod cavity, and the movable beam is pulled up by the piston rod to realize the return of the movable beam. It is characterized in that: The ratio of the effective working area S2 of the piston rod to the effective working area S1 of the piston is greater than or equal to 0.8, and the condition of 2W-F1 =(S1 S2)· p is met: 1. The vacuum negative pressure of the rodless cavity can be superimposed with the positive pressure of hydraulic oil entering the rod cavity and acting on the effective working area of the piston rod to form return pressure supply. The ratio of the effective working area S2 of the piston rod to the effective working area S1 of the piston is set to 0.85, so that the effective working area of the rod cavity becomes smaller. Even if two or more return hydraulic cylinders are provided, a large amount of high-pressure hydraulic oil is not needed to realize fast stroke.
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