Trommel assembly having a spiral assembly with decaying pitch

A trommel screen, helical technology, used in the field of trommel screen components

Inactive Publication Date: 2016-05-11
TEGA IND LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] While exploring and researching for improving the screening efficiency of trommel screens, the prior art has been searched; however none of the literature includes information on how to increase the screening efficiency

Method used

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  • Trommel assembly having a spiral assembly with decaying pitch
  • Trommel assembly having a spiral assembly with decaying pitch
  • Trommel assembly having a spiral assembly with decaying pitch

Examples

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Embodiment Construction

[0038] Having described above the main features of the present invention, in the following paragraphs a more detailed and non-limiting description of preferred embodiments will be given with reference to the accompanying drawings.

[0039] In all figures, the same reference numerals refer to the same features. Furthermore, the shape, size and number of devices are shown by way of example only and can be changed within the scope of the invention without departing from the basic principles of the invention.

[0040] The number of component parts shown is exemplary and not limiting, and the shape and size of the device as well as the number of component parts of the device may be varied within the scope of the invention without departing from the principles of the invention.

[0041] figure 1 Depicted is a complete trommel structure assembly 1 and a descending helical assembly 2 mounted inside the trommel structure assembly 1 .

[0042] The trommel drum comprises a main flange ...

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Abstract

The trommel assembly (1) with a spiral assembly having a decaying spiral pitch (3) comprises rotating drum structure with the decaying spiral assembly (2) and screen panels (6) made of polymeric material or rubber compounds. The pitch (3) is at a maximum at the inlet and at a minimum at the outlet providing increased screening efficiency. Maximum pitch produces low media height with increased inlet velocity and minimum pitch increases media height. The spiral (2) is of single start, double start or multi start configuration. The pitch (3) decreases along the trommel such that screening efficiency is improved without affecting the retention time.

Description

technical field [0001] The present invention relates generally to a trommel screen assembly and, more particularly, to an improved trommel screen assembly having a decreasing helical pitch to increase the screening efficiency of the trommel screen. The invention also relates to a method for estimating media height and mass flow rate at any location within a trommel. Background technique [0002] A trommel (from the German word for rotating drum) is a screened cylinder used to separate materials by size - for example to separate biodegradable fractions of mixed municipal waste or to separate crushed stone of different sizes. [0003] One of the oldest screening devices is the trommel or revolving screen, which is a cylindrical screen that typically rotates between 35% and 45% of critical speed. Trommels are mounted at a slight angle to the horizontal or use a series of internal baffles to convey material along the drum. By using the trommel screens sequentially from the fin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B07B1/18B07B1/24
CPCB07B1/185B07B1/24B07B1/22
Inventor V·瑞彻勒S·达斯马哈帕特拉T·玛哈拉纳B·保罗
Owner TEGA IND LTD
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