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[CN 201780065337.2] Hydraulic drive for stretching pad equipment of press machine
[CN 201780065337.2] Title of hydraulic driver for stretching pad equipment of press: Application number of hydraulic driver for stretching pad equipment of press: CN 201780065337.2 Applicant: Voith Patent Co., Ltd. Application date: 2017-10-16 Patent type: Invention application The present invention relates to a hydraulic driver for stretching pad equipment of a hydraulic shaft, such as a press, with a fluid pump, the fluid pump is used to provide a volume flow from the fluid reservoir to the hydraulic cylinder of the stretching pad apparatus and from the hydraulic cylinder to the fluid reservoir for the stretching process. According to the invention, it is provided that the hydraulic drive comprises a motor pump unit, a circulation line and a valve device, wherein the valve device is arranged between the fluid pump and the hydraulic cylinder, and wherein the volume flow can be guided from the fluid pump to the hydraulic cylinder and/or from the hydraulic cylinder to the fluid pump by means of the valve device, and wherein, via the circulation line, the circulating volume flow can be circulated from the fluid reservoir to the fluid pump and from the fluid pump to the fluid reservoir by means of the fluid pump. The invention also relates to a method for controlling such a hydraulic drive.
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