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Three Common Types of Failures in Mine Hoists and Their Causes

2022-07-29

　　Three Common Faults in Mine Hoists

　　The emergency stop of the mine hoist is simply referred to as a Class I failure: Once this type of failure occurs, the AC and DC circuits are immediately disconnected, and the system brakes to bring the hoist to an immediate stop.

　　A mine hoist emergency stop is referred to as a Class II failure: Once this type of failure occurs, the hoist will automatically decelerate according to its speed profile and will initiate automatic braking to come to a complete stop when the speed drops below 2 m/s.

　　The mine hoist signal warning is simply referred to as a Class III fault: When this type of fault occurs, the system does not initiate emergency braking or stop; instead, it only triggers audible and visual fault alerts.

　　Emergency shutdown reasons for mine hoists include:

　　(1) Two-terminal overwinding;

　　(2) Brake system hydraulic station motor failure;

　　(3) Misaligned operation of the mine hoist;

　　(4) Operation of level platform stabilizers during mine hoist operation;

　　(5) Two-terminal overspeed;

　　(6) Main motor loses excitation;

　　(7) Protection circuit power failure;

　　(8) Overcurrent in the DC main circuit;

　　(9) Overvoltage in the DC main circuit;

　　Accident-related reasons for stopping mine hoists include:

　　(1) Deformation of the mine hoist brake wheel;