Hydraulic control in a hydraulic system, especially for the operation of scrap cutters
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United States of America Patent
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Jun 12, 2007
Grant Date -
Mar 16, 2006
app pub date -
Mar 27, 2003
filing date -
May 24, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to hydraulic control in a hydraulic system for the operation of a machine tool such as a press for processing material of a certain type, especially for the operation of the scrap cutters. Said control allows for impact attenuation and combined rapid motion switching with load compensation and transfer of a hydraulic medium of a hydraulic cylinder for the movement of the other. According to the invention, said control comprises hydraulic media of a hydraulic cylinder for pre-control of a first main valve element (2.4.0), a second main valve element (2.7.0) and a third main valve element (3.7.0) which are functionally combined and a fourth valve (2.5).
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