Low-power-consumption efficient coal screening machine

Abstract

A low-power-consumption efficient coal screening machine comprises a rack, a screen body driving mechanism and a transmission mechanism. The coal screening machine is characterized in that side projections of screen strips forming screen faces are curves, a strip-shaped screen hole is formed by linking multiple unit screen hole sections formed by the adjacent screen strips in an opposite mode, each unit screen hole section is wide gradually and becomes narrow suddenly from the feeding direction of coal to the discharging direction of the coal, and the screen strips are installed on each screen body in a high and low stagger mode at selected intervals. On the coal screening machine with the screen bodies swinging at low frequency, a collision head or a hard spring is arranged on the rack and retraced when impacting the screen bodies. Generally the coal screening machine with the multiple-stage screen bodies is composed of the multiple screen bodies which swing independently and are arrayed longitudinally in a stepped mode. The low-power-consumption efficient coal screening machine has the advantages that in the work process, the screen faces swing transversely at low frequency with a large amplitude, the effect that the special screen faces and screen bodies are impacted to be retraced in the swing process is combined, loosening and delamination of the coal are facilitated, the screening process of the coal is improved substantially, the screen faces are not blocked or stuck by the coal, the maximum screening capacity and the maximum screening efficiency are obtained, and the screen through rate for screening inferior coal high in ash content and water content is improved substantially.

Description

technical field [0001] The invention belongs to operating machinery, in particular to a flat screen surface coal screening machine. Background technique [0002] For coal-fired thermal power plants, coal screening machines are essential equipment. There are several types of coal screening machines commonly used, such as comb swing type, vibration type, and roller type. The power plant selects the corresponding type of coal screening machine according to factors such as coal quality, capacity, and cost. Although the aforementioned coal screening machines have different structures and operating methods, they have their own advantages and disadvantages in comparison. But there are still some common problems to be solved. First of all, they are all equipment with high installed power and low output capacity. Especially in China, the quality of coal is difficult to control. Coal with many impurities, high ash content and high water content is very common in thermal power plant...

AI Technical Summary

Problems solved by technology

First of all, they are all equipment with high installed power and low output capacity.

Especially in China, the quality of coal is difficult to control. Coal with many impurities, high ash content and high water content is very common in thermal power plants, which brings considerable pressure to the coal screening operation and adversely affects the overall operation of the power plant.

After many years of hard work by technical workers in this industry, although some improvements have been made, the goal of increasing the output of the equipment without increasing energy consumption, not significantly reducing efficiency and not blocking the screen when screening low-quality coal has not yet been achieved

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