B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
138/73
B29C 45/82 (2006.01)
Patent
CA 1253772
A B S T R A C T A hydraulic control system for the operation of three linear and one rotary hydraulic drive assemblies of the in- jection unit of an injection molding machine, comprising a variable delivery pump supplying drive fluid at a constant pressure gradient to several supply lines controlled by two control units which are arranged in parallel and feature proportional P/Q valves and pressure transducers, a smaller pressure maintenance pump which is controllable by a third proportional P/Q valve and switchable into one of the supply lines, and a hydraulic accumulator for the temporary supply of a large quantity of drive fluid. The proportional P/Q valves convert automatically from their flow rate programs, controlled by displacement-to-voltage converters on the in- jection unit, to pressure programs controlled by the pres- sure transducers.
498795
Hehl Karl
Macrae & Co.
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