US 11,746,803 B2
Hydraulic system for a cyclically working molding machine and method for operation of such a hydraulic system
Stephan Bauernfeind, Ried in der Riedmark (AT); Pascal Bader, Muenster (AT); Martin Berger, Ernsthofen (AT); and Klaus Hubert Gattringer, Tragwein (AT)
Assigned to ENGEL AUSTRIA GMBH, Schwertberg (AT)
Filed by ENGEL AUSTRIA GmbH, Schwertberg (AT)
Filed on Dec. 9, 2021, as Appl. No. 17/546,638.
Claims priority of application No. A 51075/2020 (AT), filed on Dec. 10, 2020.
Prior Publication US 2022/0186756 A1, Jun. 16, 2022
Int. Cl. F15B 21/08 (2006.01); B29C 45/67 (2006.01); B29C 45/82 (2006.01); F15B 1/04 (2006.01)
CPC F15B 21/087 (2013.01) [B29C 45/67 (2013.01); B29C 45/82 (2013.01); F15B 1/04 (2013.01); B29C 2945/76702 (2013.01); B29C 2945/76866 (2013.01); B29C 2945/76933 (2013.01); B29C 2945/76936 (2013.01); F15B 2211/275 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A hydraulic system for a cyclically operating shaping machine, the hydraulic system including:
a hydraulic drive unit for cyclically driving a component of the shaping machine at a start time;
a pump;
a hydraulic accumulator to be discharged for driving the hydraulic drive unit and to be charged up by operation of the pump; and
an open-loop or closed-loop control unit for open-loop or closed-loop control of the pump, wherein the open-loop or closed-loop control unit is adapted to operate the pump continuously until the start time of the hydraulic drive unit to charge up the hydraulic accumulator until the start time of the hydraulic drive unit,
wherein the open-loop or closed-loop control unit is configured to calculate, based on a delivery volume and/or a hydraulic pressure of the hydraulic system, a rotary speed of the pump to generate an average delivery output of the pump, and to charge the hydraulic accumulator with the required delivery volume and/or the required hydraulic pressure by the pump.