BOOM CRANE OVERLOAD SAFEGUARD Russian patent published in 2002 - IPC

FIELD: mechanical engineering; materials handling equipment. SUBSTANCE: proposed device has ac voltage source, transformer- type magnetoelastic converter, boom length transformer-type transmitter, boom tilting angle transformer-type transmitter, rectifiers, low-pass filter units, signals multiplication units, comparators and threshold elements. Filter with final pulse characteristic averages output signal of converter during period not exceeding 0.5 - 1 of period of low-frequency oscillations at its input. Device makes it possible to determine weight of lifted load with error not exceeding one percent per one period of oscillations in "load - lifting mechanism" system which considerably reduces time of load safeguard operation at improved accuracy. Provision of channel for measuring instantaneous values of load makes it possible to protect crane from heavy short-time overloads. EFFECT: improved accuracy, provision of protection from overloads. 1 dwg