Hydraulic drives system for a press
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United States of America Patent
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Dec 29, 1998
Grant Date -
N/A
app pub date -
Jul 7, 1997
filing date -
Oct 13, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a drive system for a hydraulic press. The drive system is of the type of secondary controlled system maintaining an impressed pressure of substantially constant magnitude in a pressure system. A hydraulic transformer comprises a pair of mechanically coupled hydrostatic machines each having a variably capacity. The first machine is connected to the pressure system and the second machine to the press cylinder. The invention provides a drive system in which biasing the press cylinder, rapid tranverse and pressing stroke, decompressing the fluid and flushing of hot fluid is accomplished in a closed loop free of throttling losses. The hydraulic transformer further allows to recover energy to the pressure system.
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