Research progress of lifting equipment for large-diameter borehole rescue

Rescue through large-diameter relief well is an efficient method of mine emergency rescue. The lifting equipment of large-diameter relief well is used to lift the trapped personnel safely and reliably to the surface through the large-diameter relief well. It is the key equipment in the rescue system of large-diameter relief well. With the rescue technology of large-diameter relief well gradually recognized in the industry, the lifting equipment of large-diameter relief well has developed considerably, forming the fixed and mobile types of lifting equipment and multiple technical routes. Besides, important progress has been made in the research on the lifting equipment of mobile large-diameter relief well in China. According to the functional modules, the lifting equipment of large-diameter relief well is divided into three parts: the lifting platform, the lifting cabin, and the lifting information system. The research achievements were summarized, involving the types of the transport system of rescue lifting platform, the structure of lifting support system, the drum structure and brake system of the winch lifting system, wire rope anti-rotation technology and online defect detection technology, the structure of lifting cabin, the information fusion technology for lifting process, the structure parameter detection of the relief well and 3D model reconstruction technology. It is pointed out that the lifting platform of large-diameter relief well based on the large-tonnage all-terrain crane could better adapt to the accidental and random needs of the rescue lifting process through its strong capability, good site adaptability, and convenient and stable lifting. Besides, the flexible and bendable structure design of the rescue lift cabin can significantly improve the passing capacity. Moreover, the information fusion of the large-diameter relief well, lifting cabin, and rescue lifting platform is the basis for scientific operation and decision-making in the lifting process, and digital twinning of the rescue lifting process is the future development direction of lifting equipment for large-diameter relief well.