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[CN201610901984.X] Direct drive volume control electro-hydraulic servo hydraulic press hydraulic system
[CN201610901984.X] Direct drive volume control electro-hydraulic servo hydraulic machine hydraulic system title: direct drive volume control electro-hydraulic servo hydraulic machine hydraulic system application number: CN201610901984.X applicant: Harbin Institute of Technology application date: 2016-10-17 patent type: invention application The present invention provides a direct drive volume control electro-hydraulic servo hydraulic machine hydraulic system. The two ends of the hydraulic pump are respectively connected with the low-pressure electromagnetic reversing valve group and the high-pressure reversing valve group. The main oil tank is connected with the two ends of the hydraulic pump through two oil supplement valves. The main cylinder and the ejector cylinder are separated by the low-pressure electromagnetic reversing valve group and the high-pressure reversing valve group. The main cylinder is supplied with oil. The rodless cavity of the main cylinder is respectively connected with the high-pressure electromagnetic reversing valve and charging cylinder, the filling cylinder is connected with the main oil tank through a high-level oil pipe, the rod cavity of the master cylinder is connected with the low-pressure electromagnetic reversing valve group through the first branch and the second branch, the first branch is connected with the master cylinder control valve group, the second branch is connected with a back pressure valve, the rodless cavity of the ejection cylinder is connected with the high-pressure electromagnetic reversing valve group, and the rod cavity of the ejection cylinder is connected with the low-pressure electromagnetic reversing valve group, the master cylinder is provided with a displacement sensor, a first pressure sensor and a second pressure sensor, respectively.
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