METHOD OF INCREASING SAFETY (VERSIONS) AND SAFETY SYSTEM OF JIB HOISTING CRANE (VERSIONS) Russian patent published in 2010 - IPC B66C13/18 B66C23/88 B66C15/00 

FIELD: transport.

SUBSTANCE: invention relates to methods of increasing crane operation safety and crane safety systems. Proposed method comprises presetting tolerable parametres describing crane tolerable load and its memorising. It comprises also defining current said parametres using direct and/or indirect measurements of the crane other parametres. Measured current parametre is compared with tolerable value and generating, on the basis of said comparison, of warning and/or control signals by at least one crane actuator to prevent said parametre from exceeding tolerance. In compliance with first version, current value of parametre describing crane load is determined and represented in the form of function with at least three arguments. Pressure in jib lifting hydraulic cylinder is taken to be first input argument. Jib inclination angle is taken to be second argument, and load on hoisting rope or pressure in rib telescoping hydraulic cylinder is considered to be third argument. In compliance with second version, rib current length is used, measured indirectly proceeding from the results of measuring the other crane operating parametres. In compliance with first version, system comprises jib lifting hydraulic cylinder pressure pickups, jib inclination angle pickup and pickup of rope load or pressure in jib telescoping hydraulic cylinder. Digital computer allows computing current parametres that describes crane load using output signals of at least three said pickups. In compliance with second version, digital computer calculates jib current length using output signals of the other crane operating parametres to allows determining said current parametres describing load or jib, or load handling fixture spatial position with the help of computed value of said length.

EFFECT: higher reliability, simplified design.

16 cl, 2 dwg