METHOD AND DEVICE FOR THE SAVING OF ELECTRICAL ENERGY FOR THE DRIVE OF AN HYDRAULIC LIFT

With this method and this device for the saving of electrical energy for the drive of an hydraulic lift, it is possible to drive the lift cage in the upward direction with practically constant power for any loading. The maximum nominal speed in upward direction is chosen for a loading which accordin...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	NAGEL, HEINZ-DIETER
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	BLASTING DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR ELEVATORS ESCALATORS OR MOVING WALKWAYS FLUID-PRESSURE ACTUATORS FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS HAULING HEATING HOISTING HYDRAULICS OR PNEUMATICS IN GENERAL LIFTING LIGHTING MECHANICAL ENGINEERING PERFORMING OPERATIONS SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	With this method and this device for the saving of electrical energy for the drive of an hydraulic lift, it is possible to drive the lift cage in the upward direction with practically constant power for any loading. The maximum nominal speed in upward direction is chosen for a loading which according to experience occurs most frequently. The required size of the drive is designed in accordance with this choice. T he hoist speed is reduced correspondingly for higher loads and increased correspondingly for lower loads. The variable hoist speed is achieved either through an adjustab le pump (8) of variable displacement volume and controlled by a pressure-regulating valv e (14) or through a positive-displacement pump (28) of constant displacement volume, which pump is driven by a frequency-regulated electrical motor (31) with stepless adaptation of the rotational speed of the electrical motor (31) in dependence on the effectively present loading.