BOOM LOAD-LIFTING CRANE OVERLOAD PROTECTION METHOD (VERSIONS) Russian patent published in 2008 - IPC B66C23/88 B66C13/18 B66C15/06 

FIELD: mechanical engineering.

SUBSTANCE: invention relates to load-lifting and transportation equipment and it can be used in protection systems of load-lifting cranes. According to proposed method, tolerable loads are determined and memorized in form of function of spatial position of boom, measuring current value of load in process of operation of crane, comparing it with tolerable load and generating warning signal or signal to crane mechanisms aimed at limiting or preventing overload. In process of lifting and/or shifting of load, change of linear or angular position of crane part is revealed additionally whose change is not allowed in current stage of load lifting and/or shifting process. Depending on value of said change of position, additionally warning information signals or crane mechanism control signals are formed aimed either to prevent further increase in said change or to return said part of crane, for instance, boom, into initial position. Protection of crane from overload is implemented with due account both of absolute value and change of value of angle of tilting of crane component part from horizontal or vertical position in process of lifting and/or shifting of load.

EFFECT: improved safety of crane in operation.

21 cl, 1 dwg