Coal classifying screen

Abstract

The invention discloses a coal classifying screen. A distribution plate (14) is arranged below a feeding port (23) in an inclined mode. The two ends of a roller screen shaft (3) are installed on the two sides of a case (2) through bearing pedestals (17) respectively, and the two ends of each screen bar screen shaft (4) are installed on the two sides of the case (2) through bearing pedestals (17) respectively. Spiral guide parts (6) are arranged in the roller screen shaft (3) and the screen bar screen shafts (4) respectively and composed of forward spiral guide parts (6.1) and backward spiral guide parts (6.2), the forward spiral guide parts (6.1) are fixedly installed on one side inside the roller screen shaft (3) and one sides inside the screen bar screen shafts (4) respectively, and the backward spiral guide parts (6.2) are fixedly installed on the other side inside the roller screen shaft (3) and the other sides inside the screen bar screen shafts (4) respectively. Anti-blocking holes (10) are formed in the two ends of the roller screen shaft (3) respectively, and anti-blocking holes (10) are formed in the two ends of each screen bar screen shaft (4) respectively. The coal classifying screen is uniform in distribution and high in impact resistance, a screen surface and the screen shafts are not blocked, the requirement for two or more particle sizes of discharged materials is met, and spare parts are convenient to maintain and replace.

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 whethe...

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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