US 6,047,814 AGranted

Method for monitoring a conveyor belt and system therefor

AssigneeContTechTrasnsportbandsysteme GmbH

InventorsRainer Alles, Thorsten Wach

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Abstract

The invention relates to a method for monitoring a continuous revolving conveyor belt (4) having a connecting region (8). The connecting region (8) is monitored with the aid of two transponders (12) and (14). One of the transponders is arranged forward of the connecting region (8) and the other transponder is connected rearward of the connecting region (8). Both transponders (12) and (14) transmit respective signals to an external transmitter/receiver unit 16 wherein a conclusion is drawn as to the spacing of the two transponders (12) and (14) on the basis of the time-dependent spacing of the two signals. If the spacing s of the transponders (12) and (14) exceeds a pregiven amount, then a conclusion is drawn by the external transmitter/receiver unit (16) as to a critical change in length of the connecting region (8) and corresponding measures are initiated.

Claims10

Dependent claims

A method of monitoring a continuous revolving belt, said belt including a connecting section having a start and an end delimiting the length of said section viewed in the direction of movement of said belt, said start and said end assuming a pregiven desired distance s.sub.des therebetween measured along said section when said belt is in an unloaded, undamaged state, the method comprising the steps of:

providing at least one start transponder mounted in or on said belt at said start of said connecting section and at least one end transponder mounted in or on said belt at said end of said connecting section;
providing an external transmitter/receiver unit having an operative region wherein signals from said transponders can be received thereby;
transmitting a first signal from said start transponder to said external transmitter/receiver unit at time point t.sub.0 when said start transponder passes through said operative region;
transmitting a second signal from said end transponder to said external transmitter/receiver unit at time point t.sub.1 when said end transponder passes through said operative region;
determining a time interval dt.sub.act =t.sub.1 -t.sub.0 in said external transmitter/receiver unit;
and,
determining whether a critical change in length of said connecting section has occurred based on said time span dt.sub.act.

4 more elements

Dependencies are inferred from the claim text.