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In view of the operation safety problem in arm of tower crane, a novel safe belts hanging protection device which has the characteristics of easily removed and high safety is proposed. Based on mechanical theory, constrains of rope diameter, fixed plate thickness, orifice cross section, the bolt size are discussed. Consequently, an integrated design process for parameters of protection device is proposed, and such method can ensure the safety of operating personnel. Introduction In the operation and maintenance process, operators needs go along the sweep and go from the root to the front in order to find the potential safety hazard in tower crane. Generally, this work can be done in two ways. First one is to drive the cart in which there is basket that can move with the vehicle. Second is that operators climbs along the sweep to do the work. Practically, safety hazard exists in these two methods. In the first one, due to the unbalanced stress, the basket in the cage can easily break and fall to cause the accident. There are accidents of falling baskets. In the second method, the operators’ safety belt is not be fastened. If the belt is fastened, it’s inconvenient for the operators to work. Thus in practice, the safety belt is not used which can increase the possibility of accidents significantly. And in practice, cases that workers are threw from the sweep exist. In order to ensure the safety of the operators working in the crane sweep and avoid harm to workers, a safety device convenient for work and belt fastening is proposed. This device can not only fasten the belt but also avoid of decreasing the flexibility of operators. Structure of novel safety device The safety protection device is based on the upper chord of tower crane jib, which is composed of a steel wire rope and wire rope fixing device with a proper strength. The safety belt buckles on the steel wire rope through the fixed buckle so that it can freely slide and protect the operator in the operation process, and its scheme is shown in Fig.1. Safety protection device

A concise operation safety protection device in arm of tower crane and its parameter design