Speed-adjustable coupling type comb coal screening machine

Abstract

The invention provides a speed-adjustable coupling type comb coal screening machine. A screen is composed of a plurality of sieve tray shafts which are transversely arrayed, and a plurality of sieve trays fixed to each sieve tray shaft. In every two adjacent sieve tray shafts, the sieve trays on one sieve tray shaft extend into the spaces between the adjacent sieve trays on the other sieve tray shaft. The coal inlet end of the screen on a machine frame is higher than the coal discharge end. A screen drive mechanism comprises an electric motor, a speed reducer, cranks fixed to an output shaft of the speed reducer, driving connection rods, rockers and a driven connection rod set. One end of each driving connection rod is installed on the corresponding crank. Each rocker is fixed to the corresponding sieve tray shaft. The driving connection rods and the rockers are connected through the driven connection rod set. The length ratio of the cranks to the rockers meets the requirement that the rockers swing within a set angle range in a reciprocating manner when the cranks rotate by a circle. The speed-adjustable coupling type comb coal screening machine has the beneficial effects that the sieve trays have a forward and backward coupling repeated effect on to-be-screened materials entering the gaps between the sieve trays, and can be prevented from being blocked and stuck. It is shown through experiments that the screen is still not blocked even in the state that weed, plastic bags and broken cloth are mixed in coal and coal has severe viscidity.

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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