Control method of variable deceleration point of friction hoist based on variable load

Abstract

The invention discloses a variable deceleration point control method for a friction hoist based on the variable load. A control device comprises a tension detection device, an encoder, a synchronous switch and a double-wire system programmable logic controller. According to the method, the free deceleration generated after a deceleration signal of the friction hoist is sent out is comprehensivelyworked out by acquiring tension detection data of two cages of the friction hoist according to the load of each cage and the load difference value of the two cages and according to the friction hoistequivalent mass of the data unit assign of the double-wire system programmable logic controller, and under different operating conditions, different deceleration point signals are output, and therefore the variable deceleration distance is achieved. According to the variable deceleration point control method, in combination with the free deceleration, the deceleration which is not larger than 0.75m / s<2> required by lifting staff and the deceleration standard which is not larger than 1.2 / s<2> required by a lifting material, a deceleration signal and a positive-negative brake torque modulatingsignal are output to a hoist electric control system, and safe and economic operation of the friction hoist is achieved.

Description

technical field [0001] The invention belongs to the technical field of electric control for coal mine hoisting, and relates to the technical solution of the method for setting the distance of the deceleration point during the reciprocating up and down operation of the friction hoist, in particular to the control method of the variable deceleration point of the friction hoist based on variable load . Background technique [0002] Large and medium-sized coal mines at home and abroad are designed with a main and auxiliary shaft hoisting system. The main shaft hoisting system is used to lift the coal beneficial minerals mined underground, and the auxiliary shaft hoisting system is used to lift various materials, tools, equipment, gangue and operations used in the coal mine. personnel etc. Due to the advantages of small friction drum, hoisting wire rope diameter and compact whole set of equipment, the friction hoist has been widely used in mine hoisting, and has become the main ...

AI Technical Summary

Problems solved by technology

[0006] The auxiliary shaft friction hoist is mainly used to repeatedly lift and lower various materials, tools, equipment, gangue and operators used underground. The cage cannot be loaded with a fixed weight, and the cage load tension difference must not exceed the allowable value. Tension difference, lifting load properties change greatly

If the deceleration point of the friction hoist is set at a fixed distance, when the friction hoist lifts a heavy load, the crawling distance will increase due to the large deceleration, the operation of the friction hoist is poor, and the sliding rope phenomenon will also occur; When the friction hoist lifts a light load, the creeping distance will decrease due to the small deceleration, and the friction hoist has poor operating safety.

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