Control system for a crane

Details Control system for a crane Control system for a crane

B - Operations, Transporting

66

C

342/38

B66C 23/88 (2006.01) B66C 23/90 (2006.01)

Patent

CA 1277747

ABSTRACT OF THE DISCLOSURE The invention relates to a system for controlling the boom of a hydraulic crane, the crane being provided with at least one load sensor on the basis of which the speed of the boom is controlled so that the greatest permissible speed of the boom increases with decreasing load and correspondingly decreases with increasing load. According to the invention, in order to reduce the dynamic stresses exerted on the crane, the oil flow of the hydraulic actuating means is controlled by directly adjusting the speed of the movements of the valves of the actuating means on the basis of a speed instruction of the boom and on the basis of a load signal and by filtering such speed instructions which indicate valve movement speeds exceeding a predetermined value.

539497

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