Fixed screen for pre-dewatering medium and water in coal preparation plant

Abstract

The invention provides a fixed screen for pre-dewatering medium and water in a coal preparation plant, and belongs to the technical field of dense medium coal preparation. The fixed screen for pre-dewatering medium and water in the coal preparation plant comprises an oversize chute, a screen box structure, a connecting seat, an undersize chute and a dustproof device; the screen box structure is obliquely arranged relative to the horizontal plane; a feeding port is arranged at the top of the screen box structure; the oversize chute is fixedly connected with the bottom end of the screen box structure; the bottom of the screen box structure is fixedly connected with a screen face support; the top of the screen face support is communicated with a cavity of the screen box structure; a discharging port is arranged at the bottom of the screen face support; the screen face support is parallel to the screen box structure; and the screen face support and the discharging port form the undersize chute. Through reasonable structural design, the scouring force of material flow to a sieve plate is small, the sieve plate is slowly abraded, the service life is long, and the sieving efficiency is stable; the sieve plate is simple in structure, convenient to assemble and maintain and low in maintenance cost; and the dustproof device is convenient to assemble and disassemble, has a good dustproof effect and meets environmental protection requirements.

Description

technical field [0001] The invention relates to the technical field of dense medium coal preparation, in particular to a fixed sieve used for pre-extraction and dehydration in a coal preparation plant. Background technique [0002] At present, the pre-intermediation and dehydration equipment of the traditional dense medium coal preparation process basically adopts a curved screen. The working mechanism of the curved screen is: the slurry is fed into the screen surface from the top along the tangential direction through the feed box at a certain speed, and under the centrifugal force Under the action, the slurry layer flows close to the sieve surface. During the flow process, the slurry layer is cut by the edges of the horizontally arranged sieve bars, and the slurry smaller than the sieve gap passes through the sieve surface to become the under-screen product. Large particle materials and a small part of water Over the sieve bar to become the sieve product. [0003] During ...

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Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a fixed sieve for pre-demediation and dehydration in a coal preparation plant, which solves the problem of unstable screening efficiency and many times of sieve turning over in the existing sieve body device. , frequent replacement, large amount of maintenance, high maintenance cost and environmental protection not up to standard, etc.

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