Method, device and system for detecting load of crane and crane

The present invention provides a method of detecting a load of the crane, the crane apparatus and systems and to solve the problems of the prior art is difficult to detect the crane suffered lateral load. The method comprising: Step A: tensile tension detecting means arranged symmetrically on both sides of the boom so as to obtain two tension values; Step B: The two sides of the tension value determination of the crane carrier exceeds a preset range and then outputs the judgment result. With the technical scheme of the present invention, it can be easily and accurately detected side-loading crane. Combined with existing equipment, simply increasing the two tension detecting means, the cost increase is small. Further, the increase in the tensile force detecting means after the two can be easily determined load hoist crane is overloaded, more direct and accurate than the conventional method of detecting a load torque limiter.