We have analyzed the fault diagnosis methods of mining machinery and equipment. In order to prevent faults, we need to do necessary maintenance for mining equipment at ordinary times. Generally, we adopt the three-level maintenance system for the maintenance of mining equipment, which shows that the focus of maintenance management of mining equipment in China has changed from repair to maintenance, and pays more attention to Fault Prevention [5]. The three-level maintenance system is a kind of mandatory maintenance of equipment based on the operator. In this process, protection is the focus and maintenance is also taken into account. This maintenance system needs to rely on all members and fully mobilize the enthusiasm of all people, so that the management and maintenance rely on the combination of all staff, professionals and the masses to jointly maintain the equipment. Nanchang Kerui Mining Machinery Co., Ltd

The three-level maintenance system mainly includes daily maintenance and repair of equipment, as well as primary and secondary maintenance. This maintenance system highlights the status of maintenance in the management of equipment, specifies the work requirements of operators, and promotes the knowledge and skills of maintenance personnel in the maintenance of equipment. The application of three-level maintenance system to domestic enterprises has achieved good results. On the one hand, it increases the intact rate of enterprise equipment within a certain range, reducing the probability of equipment failure. On the other hand, it also prolongs the period of equipment overhaul and reduces the cost of overhaul.