Abstract: In order to further improve the safety monitoring level of the quayside crane, the method of constructing the heat dissipation model of a lifting gearbox was adopted to study the heat dissipation law of the gearbox when it stopped and the fast division of its health state was realized. Based on the heat transfer principle and the heat dissipation mechanism of the gearbox stop, a heat dissipation model of the gearbox was constructed. And by using the field monitoring data of the lifting gearbox of a quayside crane in Shanghai port to conduct data fitting, the model fitting parameters corresponding to the most important factors affecting the heat dissipation of the gearbox were found out and the heat dissipation law of the gearbox was put forward. On this basis, the health, subhealth and fault states of the gearbox were divided rapidly according to the initial temperature of heat dissipation when the gearbox stopped. The results show that the health state can be divided rapidly and effectively based on the initial temperature of heat dissipation when the lifting gearbox stops.

Key words: lifting gearbox; stopped state; law of heat dissipation; state division