WO2001000326A1

WO2001000326A1 - Separation apparatus

Info

Publication number: WO2001000326A1
Application number: PCT/SE2000/001392
Authority: WO
Inventors: Lars Fransson
Original assignee: Franssons Verkstader AB
Current assignee: Franssons Verkstader AB
Priority date: 1999-06-30
Filing date: 2000-06-30
Publication date: 2001-01-04
Anticipated expiration: 2001-12-30
Also published as: SE9902488D0; AU6040200A

Abstract

This invention relates to a method for separation of light material from heavier material, a separation table of vibrator type and a cyclone and a fan means being found. According to the invention the method is characterized by the following steps: the material that shall be separated is fed onto the separation table at the rear part of the same, the material being transported forwards on the table and at the same being separated; the heavier material gets a position at the lowermost part of the separation table and is fed out of the same at its front part; the light material lying on a higher level in the separation table and air are sucked away from the separation table and into the cyclone via a sucking out pipe, in which the air is separated from the light material, where after the light material is fed out of the cyclone; the air separated in the cyclone is conducted back to the separation table via pipelines and a fan means cooperating with these ones, which fan means accordingly makes possible for the air to be transported in a closed system. The invention also relates to an arrangement for separation of light material from heavier material.

Description

Separation apparatus

This invention relates to a method for separation of a light material from a heavier material, a separation table of vibrator type and a cyclone and a fan means being found. The invention also relates to an arrangement for making the separation possible.

It is previously known by means of the mentioned equipment to separate a material from another one. The air following the material which is sucked into the cyclone often contains substances which is damaging for the environment, and this air according to previously known technique has been let out into the atmosphere. This is of course unsatisfying in the society of today.

The purpose of this invention is to eliminate this problem and to provide an arrangement with an air system, which is closed. Furthermore, the arrangement has such a design that is particularly suitable for separation of a light material, for instance granulate, from heavier material, like for instance metal and stones. A preferred embodiment of the invention shall be described more closely below with reference to the accompanying drawing, where an arrangement according to the invention for making the separation possible is shown.

Referring to the drawing is shown there an essentially horizontal separation table 1, which is of vibrator type and has a vibrator flute. At the rear end 2 of the separation table the material that shall be separated is fed in. This in-feeding is made by means of a feeding-in apparatus 2, in this case a belt conveyor.

According to this embodiment is a light material, granulate of the size 30-50 mm, intended to be separated from a heavy material like metal and stones. Of course, the invention idea is applicable when separating other types of material. At the front end 3 of the separation table 1 there is a feeding-out opening

4 for the separated, heavy material, which lands up in a collection container 5.

To the front portion 6 of the separation table 1 is connected a sucking-out pipe 7 for the light material, which has been separated from the heavy material, which pipe extends essentially vertically. This sucking-out pipe is displacable upwards and downwards in the vertical direction and forwards and backwards in the horizontal direction. Furthermore, the pipe is intended to cooperate with a projecting portion 8, displacable forwards and backwards in the horizontal direction, on which portion light material is intended to be collected. Due to that fact the separation of the light material is made more effective.

The sucking-out pipe 7, extending vertically, passes over to a pipe portion 9, which extends essentially horizontally and is a connected to a cyclone 10, in which the light material is separated from the air in the system. The light material is intended to fall down from the cyclone onto feeding-out conveyor 11, by means of which the material is taken to a not shown collection container. The separated air is conducted from the upper part of the cyclone 10 via a first pipeline 12, a fan means 13 and a second pipeline 14 back to the separation table 1 via a falling chamber 15 where the air velocity is essentially reduced.

By conducting the air in the mentioned way from the cyclone back to the separation table, the air transport is made in a closed system, which accordingly eliminates air outlet into the atmosphere and by that a detrimental influence on the environment. The described arrangement functions in the following way:

The material that shall be separated is fed via a feeding-in device 2 on to the separation table 1 at its rear end, where a vibrator flute or the like brings the material forwards. At the same time there is a separation of the material so that the heaviest particles fall out from the separation table 1 at its front, lower end 3 and down into a collection container 5. The fact that the material is taken from the rear end of the separation table to its front end under simultaneous separation has the consequence that the mentioned separation becomes very effective. During the separation the light particles land up on a higher level, and preferably on a projecting portion 8 in the separation table. This portion can be displaced forwards and backwards in the horizontal direction, so that the portion can be adjusted for good cooperation with a sucking-out pipe 7, which leads to a cyclone 10. In order to attain the best cooperation between the sucking-out pipe 7 and the projecting portion 8 (with the light particles) the sucking-out pipe is displaceable upwards/downwards and forwards/backwards . In the cyclone 10 the air of the circulation system is separated from the light particles, whereby the later ones fall down from the cyclone to a feeding-out device 11. The air separated in the cyclone 10 is conducted back to the separation table 1 via the first pipeline 12, the fan means 13 and the second pipeline 14. Before the air reaches the separation table, it is allowed to pass a falling chamber 15, where the air velocity is essentially reduced.

The invention is of course not limited to the mentioned embodiment but can be modified within the scope of the following claims.

Claims

1. A method for separation of a light material, for instance granulate, from heavier material, for instance metal and stones, a separation table of vibrator type and a cyclone and a fan means being found, c h a r a c t e r i z e d by the combination of the following steps:

- The material that shall be separated is fed onto the separation table at the rear part of the same, the material being transported forwards on the table and at the same being separated;

- The heavier material gets a position at the lowermost part of the separation table and is fed out of the same at its front part,

- The light material lying on a higher level in the separation table and air are sucked away from the separation table and into the cyclone via a sucking-out pipe, in which the air is separated from the light material, whereafter the light material is fed out of the cyclone; - The air separated in the cyclone is conducted back to the separation table via pipelines and a fan means cooperating with these ones, which accordingly makes possible for the air to be transported in a closed system.

2. A method according to claim 1, c h a r a c t e r i s e d in that the air is allowed to stream through a falling chamber before it reaches the separation table, whereby the air velocity is essentially reduced.

3. An arrangement for separation of light material from heavier material, a separation table of vibrator type and a cyclone and a fan means been found, c h a r a c t e r i z e d by the combination of the following features:

- The separation table (1) has such a design that the material, fed into this one and shall be separated, is taken from the rear portion of the table towards the front portion of the table, at the same time as the separation is going on, and has two different levels for the separated material, a low level for the heavier material and a higher level for the light material;

- A sucking-out pipe (7) with a connection with the cyclone (10) has such a design that it can be placed at the level for the light material and suck up this one together with the air for in-feeding to the cyclone (10), where the air is separated from the light material; - The cyclone (10) has a feeding-out device at its bottom for the separated, light material and a feeding-out opening at its top portion for the separated air, which is intended to be returned to the separation table (1) by means of pipe lines (12, 14) and a fan means (13).

4. An arrangement according to claim 3, characterizedin that the separation table (1) at the higher level has a projecting portion (8), on which the light material is intended to be collected, and which is displaceable forwards and backwards essentially in the horizontal direction for good cooperation with the lower end of the sucking-out pipe (7), which end is displaceable upwards/downwards and forwards/backwards, which makes possible an effective sucking-away of the light material from the separation table (1).

5. An arrangement according to claim 3 or 4, characterizedin that the arrangement comprises a falling chamber (15), which is positioned with the fan means (13) and the separation table (1) in the circulation system of the air.