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[CN201710063522.X] Heavy-duty dual-function hydraulic press master cylinder drive system and use method thereof


[CN201710063522.X] Heavy-duty dual-function hydraulic machine master cylinder drive system and its use method Title: Heavy-duty dual-function hydraulic machine master cylinder drive system and its use method Application number: CN201710063522.X Applicant: Tsinghua University Application date: 2017-2-3 Patent type: Invention application The present invention provides a heavy-duty dual-function hydraulic machine master cylinder drive system, using three large-flow oil supply pumps, small-flow oil pump and variable oil pump in parallel, in addition, the three oil supply pumps are respectively connected to the bypass oil discharge circuit and the plunger cylinder through the one-way control valve. When in use, any one or two or three oil supply pumps of the three oil supply pumps are selected according to the speed requirement of the plunger cylinder, which can realize the demand of the plunger cylinder for high-pressure and large-flow oil during vertical extrusion. The small-diameter main oil circuit control branch and large-diameter main oil circuit control branch between the oil supply circuit and the plunger cylinder are used, it can realize the precise control of the speed of the plunger cylinder to meet the needs of die forging for the precise control of the flow of high-pressure oil into the plunger cylinder, thus providing the basis for the realization of the two functions of die forging and vertical extrusion on a heavy hydraulic press, reducing the processing and manufacturing costs and improving the efficiency of a single heavy hydraulic press.