Hydraulic positioning drive with pressure and position feedback

Motors: expansible chamber type – Working member position feedback to motive fluid control – Electrical input and feedback signal means

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Details

91367, 91459, 91462, F16D 3300, F16D 3102

Patent

active

052302725

ABSTRACT:
A hydraulic drive is actuated by a CNC means via an electrically actuable valve. The pressure applied to the hydraulic drive or the force excerted by the hydraulic drive is supplied in the form of a signal to a pressure control means or a force control means. The output signal of the pressure- or force control means is supplied via a switch means--shortly prior to reaching the desired position value of the drive--to the electrically operated valve as a control signal. Simultaneously, the output signal of the switch means, which can be supplied to the valve, is interrupted, wherein the switching range shortly prior to reaching the desired position value is smaller than the admissible differential value, determined by the CNC means, i.e. the differential value between each actually present desired position value and actual value, or, wherein, with the switch-over from the position control to the pressure- and force control, respectively, the desired position value signal supplied by the CNC means is brought to the value of the actual position value. Thus, the invention provides the possibility to switch the position control circuit over to a force control circuit or a pressure control circuit and back, without having to take the risk of an automatic switch off or disconnection of the drive.

REFERENCES:
patent: 3958492 (1976-05-01), Curless
patent: 4336745 (1982-06-01), Lund
patent: 4700610 (1987-10-01), Bauer et al.
patent: 4712470 (1987-12-01), Schmitz
patent: 4817498 (1989-04-01), Takagi

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