Coupled comb type coal screening machine

Abstract

A coupled comb-type coal screening machine, the screen is composed of a plurality of sieve disc shafts arranged horizontally with each other, and a plurality of sieve discs fixed on each sieve disc shaft, and one of the adjacent sieve disc shafts The sieve trays on the top extend into the adjacent sieve trays on the other sieve tray shaft respectively, and the coal inlet end of the screen mesh on the frame is higher than the coal discharge end. The screen drive mechanism includes a motor, a reducer, a crank fixed on the output shaft of the reducer, an active connecting rod installed on the crank at one end, a rocker respectively fixed on each sieve disc shaft, connecting the active connecting rod and each rocker The driven connecting rod group, wherein the length ratio of the crank and the rocker satisfies that the crank rotates one revolution and the rocker swings back and forth within a set angle range. The positive effect of the invention is: the sieve plate has positive and negative coupling and repeated actions on the materials to be screened entering the gap of the sieve plate, and can prevent self-blocking and self-blocking. Experiments have shown that the screen will not be blocked even when coal is mixed with weeds, plastic bags, and rags, making the coal viscous.

Description

technical field [0001] The invention belongs to operating machinery, in particular to coal screening equipment used in coal-consuming places such as thermal power plants. Background technique [0002] In the past, the coal screening machines used by large and relatively large coal-consuming enterprises such as thermal power plants can meet the production requirements when screening non-inferior coal (ash, moisture, and impurities do not exceed the standard). But in our country, it is undeniable that the raw coal of thermal power plants generally has high ash content, high water content, and mixed with stones, wood blocks, metal blocks, fabrics, etc. This kind of coal quality brings many difficulties to the treatment before use, especially the initial screening with large differences in inclusion particle size (from bulk to powder). Use the existing screening machinery to screen the low-quality coal used by most enterprises. It is common practice in the industry to block the...

AI Technical Summary

Problems solved by technology

The problem of coal screen blockage is very serious. It is necessary to enlarge the screen hole, and the screened fine material becomes larger, so that the particle size produced in the coal screening link is too large, the screening efficiency is low, the power consumption is high, the equipment failure rate is high, and the coal screening machine is blocked. , a large amount of fine coal will enter the coal crusher, threatening the safe operation of the coal crusher

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