Method for automatically controlling an electrohydraulic pressing tool

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United States of America Patent

PATENT NO 9356540
APP PUB NO 20130328513A1
SERIAL NO

13985941

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Importance

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Abstract

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In the case of a method for automatically controlling an electrohydraulic pressing tool, in particular for producing pipe connections, to actuate the pressing tool a hydraulic piston is moved, in that fluid is pumped into a hydraulic cylinder by a hydraulic pump driven by an electric motor. When a limiting pressure in the hydraulic cylinder is reached, a pressure relief valve opens, and so the hydraulic fluid can flow into a reservoir. With the aid of a control device, a current drop at the motor is detected when the valve opens. The electric motor is switched off when the current falls by a predetermined value (ΔI) and/or decreases over a predetermined time period (Δt) after reaching a limiting current.

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Patent Owner(s)

Patent OwnerAddress
NOVOPRESS GMBH PRESSEN UND PRESSWERKZEUGE & CO KG41460 NEUSS

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hanisch, Joerg Wuppertal, DE 3 12
Jechow, Dennis Wuppertal, DE 1 4
Odenthal, Guenther Moenchengladbach, DE 1 4

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