Hydraulic speed controls for die closing unit of injection moldi

Details Hydraulic speed controls for die closing unit of injection moldi Hydraulic speed controls for die closing unit of injection moldi

1983-10-14

1986-01-21

Garrett, Robert E.

Motors: expansible chamber type

Plural relatively movable or rigidly interconnected working...

With means for selectively changing the speed or force...

91453, 91459, 4254512, 425590, 425135, 92 11, F15B 1306

Patent

active

045651167

ABSTRACT:
A hydraulic actuator assembly for a push-type die closing unit of an injection molding machine which has a central, internally bypassable power piston, lateral cylinders for rapid opening travel and a rearward stationary plunger for rapid closing travel, the lateral travel cylinders and the pressure spaces of the power cylinder creating a differential effect under which a small external flow volume of pressurized fluid is required from the pump to produce rapid opening and closing travel while a much larger internal flow volume passes through a flow connection between the cylinders. A program-controlled proportional-response throttle valve in this flow connection gives an accurate and steady control over the travel speeds, especially during deceleration. The throttle valve also makes it possible to obtain a forcible initial die opening movement.

REFERENCES:
patent: 3237641 (1966-03-01), Audemar
patent: 3698826 (1972-10-01), Henderson
patent: 3894477 (1975-07-01), Tomikawa
patent: 4326750 (1982-04-01), Rosenbaum
patent: 4380427 (1983-04-01), Hehl
patent: 4443179 (1984-04-01), Wohlrab
Mannesman/Rexroth-Information, 3/1982, ISSN, pp. 6-7.

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