Abstract The traditional spiral drum type cobalt crust mining head will mix a lot of waste rocks in the actual mining process. In order to realize the accurate stripping of cobalt crusts in complex and changeable seabed mining areas and improve mining rate, it is necessary to design a mining head that can be mined efficiently. Firstly, aiming at the geomorphic characteristics of the seabed cobalt crust distribution, the basic requirements for mining head design were put forward, and a suspended mining head was designed and its parametric design mathematical model was established. Then, based on the designed suspended mining head, with the goal of reducing the specific energy consumption in the crushing process of cobalt crust, taking the non-interference of mining head pick, reasonable layout of intercept distance, cobalt crust production capacity compliance and maximum power limit as constraints, an optimization model of structural parameters and working parameters of the suspended mining head was established and solved by the genetic algorithm. Lastly, in order to verify the rationality of the optimization model, the ABAQUS software was used to simulate the crushing process of cobalt crusts by the suspended mining head, and the specific energy consumption of crushing cobalt crusts by the mining head before and after optimization was obtained, and the stability of the mining head was compared and evaluated based on the load fluctuation characteristics. The theoretical calculation results showed that the specific energy consumption of crushing cobalt crust by the suspended mining head after optimization was about 44% lower than that before optimization. The simulation results showed that the specific energy consumption and the load fluctuation coefficient of crushing cobalt crust by the suspended mining head after optimization were reduced by 18% and 31.3% than those before optimization, which verified that the effectiveness of the optimization model. The designed suspended mining head can not only significantly improve the energy consumption and load fluctuation, but also can better adapt to the distribution characteristics of seabed cobalt crusts, which can provide an important basis for the commercial mining of deep-sea cobalt crusts.
Received: 03 December 2020
Published: 28 October 2021
ZHAO Bo, ZHAO Hai-ming, LIU Chen, HU Gang. Parametric design and optimization of suspended mining head for deep-sea cobalt crust. Chinese Journal of Engineering Design, 2021, 28(5): 559-568.