Method for completely unloading mineral aggregates from skip

Abstract

The invention belongs to a control technique for mine hoists, and provides a method for completely unloading mineral aggregates from a skip, The method comprises the following steps that: a fixed interval is set; when a hoist is in an absolute releasing state, and an unloaded skip enters into the fixed interval at a constant speed, the current of a major loop is continuously sampled and read in a circulating mode; through comparing an actually-measured value with a reference value, whether the unloaded skip is empty is determined, if the unloaded skip is not empty, a master controller sends a signal for indicating that the unloaded skip is not empty to a loading station controller and a monitoring system, the loading station controller sends a command for closing a weighing hopper valve, and the unloaded skip enters the shaft bottom and is no longer loaded, then the unloaded skip continues going upwards to be unloaded for the second time, and the working procedure above is repeated until the unloaded skip is empty. By using the method disclosed by the invention, a situation that a main shaft hoist runs in an overload or severe overload mode is avoided, the occurrence of serious accidents caused by the severe overload of the hoist is reduced or avoided, and the safety production capacity of a main-shaft hoisting system is increased.

Description

technical field [0001] The invention belongs to the mine hoist control technology, and mainly proposes a method for ensuring that a skip can unload mineral materials. Background technique [0002] At present, known mine hoists usually use a skip to lift mineral materials, including raw coal (coal mine) and ore (metal ore and non-metal mine). The hoist that mainly lifts mineral materials is called the main shaft hoist. The main shaft hoist usually has two skips: the main skip and the auxiliary skip, or a skip and a counterweight, skip or counterweight It is connected to the first rope through the suspension device at the top. In most lifting systems, there is usually a tail rope connected between the skip and the skip or counterweight at the bottom. Two empty skips or empty skips in the same lifting system It is basically the same as the weight of the counterweight itself, and the unit length weight of the head rope and the tail rope is also basically the same. In this way,...

AI Technical Summary

Problems solved by technology

[0005] In the "automatic" operation mode, the start signal of the main shaft hoist is based on the "empty" signal of the weighing hopper. If the mineral material (coal or ore) The mineral material is relatively "sticky" due to the high water content in the medium or other reasons, so that the upward skip cannot empty the mineral material during the short period of time during the loading of the downward skip; then, in the next lifting process, the When the skip is not fully unloaded, the fixed weight loading will cause the hoist to overload

[0006]Once the hoist is seriously overloaded, it will cause severe heating of the motor, fatigue damage to the hoisting wire rope and the hoist; Serious over-rolling accidents that stop production, resulting in large economic losses

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