Classifying screen for coal

Abstract

The invention discloses a classifying screen for coal. A material distribution plate (14) is obliquely arranged below a feed port (23), the two ends of a rotary screen sieve shaft (3) and the two ends of a grating sieve shaft (4) are installed on the two sides of a case (2) through bearing pedestals (17) respectively; guide spirals (6) are arranged inside the rotary screen sieve shaft (3) and the grating sieve shaft (4); the guide spirals (6) comprise the forward guide spiral (6.1) and the backward guide spiral (6.2), the forward guide spiral (6.1) is fixedly installed in one side of the rotary screen sieve shaft (3) or the grating sieve shaft (4), and the backward guide spiral (6.2) is fixedly installed in the other side of the rotary screen sieve shaft (3) or the grating sieve shaft (4). The two ends of the rotary screen sieve shaft (3) and the two ends of the grating sieve shaft (4) are provided with anti-blocking holes (10) respectively. The classifying screen for the coal has the advantages of being even in material distribution, high in shock resistance, capable of meeting requirements of two or more discharge particle sizes, and convenient to overhaul and replace, and blockage does not exist inside sieving faces or the sieve shafts.

Description

technical field [0001] The invention relates to a screening device for coarse and fine coal materials, in particular to a coal grading screen in the field of coal and mines. Background technique [0002] Circulating fluidized bed boilers in thermal power plants burn coal gangue particles with a certain particle size. Coal materials in coal mines contain a large number of qualified particle sizes and do not need repeated crushing. Therefore, a screening machine is required to separate the qualified particle sizes to reduce over-crushing. The amount is more in line with the boiler combustion curve. In the coal handling system of the power plant, parameters such as the screening efficiency of the screening machine, coal blocking, whether the material is evenly distributed, and the cycle of maintenance and replacement of parts directly affect the combustion curve of the boiler. [0003] The screening efficiency of the screening machine, the coal blocking situation, and whether ...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to solve the deficiencies of the prior art, provide a new type of coal grading screen, and solve the problem of low screening efficiency, insufficient output, inability to distribute materials, serious wear and tear, poor impact resistance, and material blocking on the screen surface of traditional screening equipment. , Material blockage in the screen shaft, difficult maintenance, short cycle of replacing parts, etc.

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