DRAGLINE DUMP POSITION CONTROL

摘要

A method of controlling the dump position of a dragline 1 of the type where inclination of the bucket 4 is controlled by differential control of the front hoist rope 7 and the rear hoist rope 8, in order to control dumping too close to the dragline house 2 in a position where the bucket will not release all the load and where slackness in the front hoist rope can cause fouling and serious damage. The complex locus of rear hitch positions 14 that will result in an acceptable dump angle at the bucket when dumped, is empirically transposed to a locus of rear hitch positions 15 at a typical carry angle before dumping, which is in turn approximated by a vertical cylindrical envelope 16. Calculation of when the rear hitch position 13 reaches the envelope 16 may be easily performed by a computer in real time using available parameters such as rear rope inclination and payout values.