High performance bending machine with reduced energy dispersion
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United States of America Patent
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Issued Date -
Apr 17, 2003
app pub date -
Oct 8, 2002
filing date -
Oct 11, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A bending machine comprises a bending unit moved by hydraulic actuators controlled by a variable displacement hydraulic pump provided with an electronic closed-loop flow rate, pressure and power control system including an electrically controlled proportional valve. The valve includes a valve spool for the control of the swivel angle of the pump and a proportional solenoid for moving the valve spool to a position corresponding to a desired swivel angle of the pump. The control system includes an inductive position transducer, a pump swivel angle transducer, a pump pressure transducer and a programmed electronic control unit which receives position, swivel angle and pressure signals from said transducers and predefined pressure, power and flow rate commands and supplies a control signal to said proportional solenoid.
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