Mine emergency lifting driving system

Abstract

The invention belongs to hoists and control technologies thereof, and provides a mine emergency lifting driving system which mainly comprises a standby emergency power supply, a group of change-over switches, a three-phase rectifier transformer, a rectifier, an inverter, a brake chopper, a brake resistor and the like. A control system in lifting electric control equipment is combined without changing lifting host equipment, so that the requirement of emergency lifting is met under the condition of 'double stop' of grid power or serious failure of a frequency conversion system in the lifting electric control equipment, and emergency lifting power is reserved for mine lifting, particularly cage lifting, mancar lifting, bucket lifting and the like for transporting personnel. When a fault occurs, passengers trapped in a shaft can be safely evacuated to a well mouth (ground) in a short time, a safety channel is provided for underground personnel or emergency rescue personnel and materials needing emergency evacuation, and the safety and the reliability of mine lifting are improved; and meanwhile, the equipment investment and the operation and maintenance cost are low, and the social and economic benefits are obvious.

Description

technical field [0001] The invention belongs to the technical field of a hoist and its control, and specifically proposes a mine emergency hoisting driving system. Background technique [0002] The mine hoist is the throat equipment of the mine and is used as a primary load. It usually has a double-circuit power supply, but these two circuits are both powered by the network, and the source is of the same nature, and there is a possibility of failure at the same time. The specific reason may be unpredictable natural disasters such as typhoons, hail, etc., or even man-made disasters such as poor management and improper operation. "Double stop" accidents in which dual-circuit power supply fails occur from time to time in mines across the country. The power failure caused the mine hoist to stop suddenly in the middle of its operation. If the power supply cannot be restored in a short time, the occupants in the faulty hoisting container will be trapped in the shaft, and the under...

AI Technical Summary

Problems solved by technology

The mine hoist used to transport personnel usually has an installed capacity of hundreds to thousands of kilowatts. Considering a certain margin, the installed capacity of the backup emergency power supply is usually 1.3 times or more than the installed capacity of the mine hoist, which is expensive and expensive. It is not commonly used, and the cost of investment and operation and maintenance is high; this method has certain safety hazards, that is, during the process of negative force deceleration and heavy load lowering of the mine hoist, the hoisting motor is in the state of power generation, and the energy is reversed. Pumping causes the voltage of the main circuit on the output side of the diesel generator set to rise, and the overvoltage may damage related equipment and devices including the generator. Serious equipment failures occur during emergency lifting, and the consequences are even more serious.

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