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AssigneeCaterpillar Global Mining Europe GmbH
InventorsGerhard Merten, Karl-Heinz Schürer, Jörg Wirtz, Manfred Bäumler, Uwe Böker
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An extraction device, particularly for mining, having two drive stations and a drive chain which extends between the sprockets thereof. So that hanging chain or chain wear to a conveyor chain, in the case of a conveyor device, or to a plow chain, in the case of a plow device, can be detected, magnetic sensor units for detecting at least one chain condition of the drive chain are provided, wherein each sensor unit includes a transmitter, which is formed by a static or dynamic magnetic field generator, and a detector field, which is provided with a plurality of magnetic field detectors, as a detector, the detector and the transmitter being arranged to the side of a passage for the run of the drive chain that is to be scanned. The invention also relates to a method for controlling an extraction device for preventing hanging chain.
An extraction device, particularly for mining, having a first drive station and a second drive station which is preferably capable of being tensioned by a tensioning means, the device having sprockets which are mounted in the drive stations, the device further including a drive chain which includes chain links being movable by means of the sprockets and extends between the sprockets in the form of an upper run and a lower run, the device having at least one magnetic sensor unit for detecting at least one chain condition of the drive chain in at least one of the upper run and the lower run, each sensor unit comprising a transmitter which includes a magnetic field generator and a detector field, the detector field including a plurality of magnetic field detectors, the detector and the transmitter being arranged to the side of a passage for the run of the drive chain that is to be scanned.
A method for controlling an extraction device particularly for mining, having a first drive station and a second drive station which is preferably capable of being tensioned by a tensioning means, the extraction device having sprockets which are mounted in the drive stations, the device further including a drive chain which includes chain links and may be moved by means of the sprockets and extends between the sprockets in the form of an upper run and a lower run, the extraction device further including at least one magnetic sensor unit for detecting at least one chain condition of the drive chain in at least one of the upper run and the lower run, the extraction device having an evaluation and control device to which signals from the magnetic sensor unit are supplied and by means of which the extension condition of the tensioning means or the drives of the drive stations may be controlled, each sensor unit generating a magnetic field that is scanned by means of a detector field formed by a plurality of magnetic field detectors, wherein the run of the drive chain that is to be scanned is guided between the magnetic field generator and the detector field and the chain condition of the drive chain is determined from a change in the position of the magnetic field detected in the detector field.
Dependencies are inferred from the claim text.