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AssigneeMannesmann Rexroth GmbH
InventorsJorg Dantlgraber, Lothar Schulz, Reiner Puschel
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A hydraulic circuit for supplying a plurality of series-operated consumers of a hydraulically controlled installation, in particular of an injection molding machine, having a pump with feed-flow pressure control, is described. To be able to slow down greater moving masses with very little expenditure in regard to circuitry and devices, only a portion of the consumers, such as the extruder, the injection unit and possibly the ejector are operated in open circulation, while at least one selected further consumer, such as the clamping unit of the injection molding machine, where a greater mass must be moved in alternating directions, is moved in semi-closed or closed circulation.
A hydraulic circuit for supplying a plurality of consumers, operated sequentially, the hydraulic circuit having a main pump with feed-flow and pressure control, and wherein a portion of the consumers are operated by means of the main pump in an open circuit and at least one selected consumer, which moves a large mass in alternating directions, is operated by means of the main pump in a semi-closed or closed circuit, and wherein said main pump is associated with a means for switching the feed direction of the main pump for reversing the movement at the at least one selected consumer.
A hydraulic circuit for supplying a plurality of consumers, operated sequentially, of a hydraulically controlled installation having a main pump with feed-flow and pressure control, characterized in that a portion of the consumers are operated by means of the main pump in an open circuit and at least one selected consumer is operated by means of the main pump in a semi-closed or closed circuit, wherein the main pump is a pump which can be rotated beyond zero and has an adjustable displacement volume, and that its feed direction is reversed for reversing at the at least one selected consumer, wherein the pump aspirates hydraulic fluid from a reservoir via respectively one back-pressure valve and that to the back-pressure valve, which is active in the open circuit in the normal feed direction of the main pump when the other sequentially-operated consumers are operated, a 2/2-way valve is parallel connected each time an appropriate check valve, assigned to the respective sequentially-operated consumer, is opened.
A hydraulic circuit for supplying a plurality of consumers, operated sequentially, of a hydraulically controlled installation having a main pump with feed-flow and pressure control, characterized in that a portion of the consumers are operated by means of the main pump in an open circuit and at least one selected consumer with two cylinder chambers is operated by means of the main pump in a semi-closed or closed circuit, wherein the main pump is embodied as a pump with adjustable displacement volume and wherein by means of a 4/3-way valve one of the two cylinder chambers of the selected consumer can be selectively connected to either a pressure or an aspirating connection of the main pump and concurrently the other cylinder chamber to the aspirating or pressure connection of the main pump.
Dependencies are inferred from the claim text.