Screen mesh, coal screening machine and control method of coal screening machine

Abstract

The invention discloses a screen mesh. The screen mesh comprises a plurality of screen shafts, screen pieces, air current channels and exhaust holes, wherein the screen shafts are placed in parallel and form an oblique plane; the screen pieces are perpendicular to the screen shafts and are mounted on each screen shaft at equal intervals in a matched mode, and the screen pieces of different screen shafts are inserted into the gaps between the screen pieces of the adjacent screen shafts in an interlaced mode; the air current channels are arranged inside the screen shafts and the screen pieces and communicate the screen shafts with the screen pieces; and the exhaust holes are evenly and circumferentially arranged on the screen pieces close to the matching position of the screen pieces and the screen shafts, extend in the axial direction of the screen shafts, and oblique at a certain angle towards the direction of the screen shafts. According to the screen mesh, coal attached to the corners of the connection between the screen pieces and the screen shafts is blown off through high-pressure high-speed gas to prevent sticking of the coal. The invention further provides a coal screening machine and a control method thereof. According to the coal screening machine and the control method thereof, the rotating speed of a driving motor is controlled through a control device according to the pressure of the high-pressure gas output by a fan, the screen mesh is effectively controlled to avoid sticking of the coal, the screening efficiency is improved, and the energy is saved.

Description

technical field [0001] The invention relates to the technical field of operating machinery, and more specifically, the invention relates to a screen, a coal screen and a control method thereof. Background technique [0002] In recent years, in order to reduce fuel costs, some power generation companies have purchased a large amount of ground coal and coal slime as fuel, resulting in a substantial increase in the viscosity of the coal entering the plant. In addition, the structure of the roller screen used at this stage is unreasonable, resulting in sticking of the screen shaft during operation. The coal is serious, so that a large amount of viscous coal is attached to the corner of the screen and the screen shaft, which affects the screening effect, and even makes the screen shaft into a roller form. In this case, when the coal passes through the screen surface of the coal screening machine Can not achieve the screening effect, also can not achieve the effect of crushing coa...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems of serious coal sticking and low screening efficiency of the traditional coal screening machine, the present invention designs and develops a coal screening machine, adopts the above-mentioned screen, and installs a solid-gas separation device at the exhaust port, which avoids sticking Coal, which improves the screening efficiency, and can also separate and recover the coal dust taken away by the gas, reducing the waste of resources

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