Means for pressure and quantity control of the hydraulic drives

Details Means for pressure and quantity control of the hydraulic drives Means for pressure and quantity control of the hydraulic drives

1986-10-17

1988-05-17

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

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

Feed control of material en route to shaping area

264 405, 425146, 425170, B29C 4577, B29C 4580

Patent

active

047447435

ABSTRACT:
In a plastic processing machine (injection moulding machine) the amount of working medium to be supplied to the hydraulic drives and to the injection cylinder and the clamping cylinder is regulated to control the adjustment rates via a quantity control of an adjustment pump. The setting of the pressures necessary at the drives is effected in contrast via a directional valve which controls the fluid paths to one of the drives and which is adapted to be connected to the tank via a regulatable throttle point governing the pressure. This simplifies the apparatus expenditure for the pressure control of such a machine.

REFERENCES:
patent: 3771935 (1973-11-01), Loichen
patent: 4020633 (1977-05-01), Hehl
patent: 4060362 (1977-11-01), Wilson, III

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