Hydraulic mold clamping unit

Details Hydraulic mold clamping unit Hydraulic mold clamping unit

2006-04-05

2008-09-16

Mackey, James (Department: 1791)

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Mold motion or position control

C425S169000, C425S450100, C425S589000

Reexamination Certificate

active

07425123

ABSTRACT:
A hydraulic mold clamping unit, in particular for an injection molding machines or a press, includes a fixed lower platen and an upper plated which is moved by an open-close mechanism in a vertical direction. The open-close mechanism includes at least one hydraulic cylinder of a first type having a double-acting piston, and at least one hydraulic cylinder of a second type. A hydraulic pump system is operatively connected to both sides of the hydraulic cylinder of first type, and a pressure accumulator is operatively connected to the hydraulic cylinder of second type. In order to realize an energy-efficient operation of the upper platen at little pressure build-up, a proportional or regulation valve is disposed in the pump system for modifying a back pressure in the hydraulic cylinder of first type, when closing the lower and upper platens.

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patent: 6527540 (2003-03-01), Dantlgraber
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patent: 06039842 (1994-02-01), None
patent: 2003-21103 (2003-01-01), None

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