Research on Dynamic Characteristics of Lifting Rope-Breaking for the Nuclear Power Crane

The nuclear power crane is an important equipment for handling operation in nuclear power plants. The nuclear power crane is equipped to complete the operation even in its own short-time rope-breaking failure state. Therefore, it is necessary to study the possible failure dynamic characteristics and safety of the nuclear power crane. The coupling modeling of the real structure and mechanism of a nuclear power crane is carried out, and the dynamic formula of its rope-breaking failure state is derived. The high-precision three-dimensional model is established, which considers the flexibility of the wire rope and simulates the winding of the wire rope in the pulley groove and the tangency contact relation between the wire rope and the pulley, so as to realize the orderly winding of the wire rope in the space between all the lifting pulleys, making the model both real and easy to solve. For the special spatial parallel winding mode of double wire ropes, the failure dynamic characteristics of the nuclear power crane when one wire rope breaks suddenly and the other one is still able to suspend the lifting weight in the air is studied. The simulation results show that one wire rope in the system fails suddenly under the condition of failure lifting, and the special wire rope winding mode makes the lifting weight remain suspended and continue to lift. From the view of the wire rope stress, the stress of the other wire rope becomes twice of the original after the sudden failure of one wire rope. At the same time, the balance lever and spring buffer device also play an effective buffering role after a sudden failure. The special winding mode of the wire rope and pulley makes the two wire ropes bear the lifting weight jointly.