Classifying – separating – and assorting solids – Magnetic – Paramagnetic
Patent
1998-05-11
1999-08-03
Bollinger, David H.
Classifying, separating, and assorting solids
Magnetic
Paramagnetic
209225, 209231, 209215, B03C 100
Patent
active
059313099
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for separating fragments of low-magnetic metallic materials, such as stainless steel of various kinds, from a mixture of such fragments and fragments of non-magnetic materials, such as aluminium, copper, lead, glass, and plastics.
In order to recover recyclable materials, e.g. scrap cars and machinery of various kinds are cut up in so-called fragmentation plants wherein the scrap materials are ground into fragments of various shape and appearance. One then obtains a mixture of fragments of many different materials. Fragments of magnetic materials may be separated in magnetic separating plants whereas fragments of non-magnetic metallic materials may be separated in induction separating plants of the kind described in the Swedish Patent Specifications 8800770-3 and 9103388-6. Fragments of certain low-magnetic metallic materials, such as various kinds of stainless steel, cannot be separated in any one of these two types of plants.
The object of the present invention therefore is to provide a device by means of which fragments of low-magnetic metallic materials may be efficiently separated from a mixture of such fragments and fragments of non-magnetic materials.
This object is achieved by means of a separating device which is characterised by an endless conveyor belt, comprising a first belt run defining a separating plane having an upwards inclination in the direction of movement of the conveyor belt, and a second belt run located at the upper end of the separation plane and defining a discharge section; a first magnetic plate extending in parallel with and closely underneath the first belt run, from the upper end of said first belt run along at least part of the length thereof, and supporting a plurality of permanent magnets arranged in parallel rows of alternate polarity; a transfer unit for transferring the mixture of fragments to the first belt run of the conveyor belt at a predetermined downstream position below which extends the first magnetic plate; and a second magnetic plate disposed below the second conveyor belt run and supporting a plurality of permanent magnets arranged in parallel rows of alternate polarity, said second magnetic plate having such an inclination relatively to the second belt run that the spacing between said second belt run and said second plate increases in the direction of movement of the conveyor belt.
The rows of permanent magnets disposed on the first magnetic plate preferably extend in the transverse direction of the conveyor belt.
The rows of permanent magnets disposed on the second magnetic plate preferably extend in the transverse direction of the conveyor belt. The inclination of the second magnetic plate relatively to the second belt run preferably is adjustable.
The inclination of the separation plane preferably is adjustable, the angle of inclination of the separation plane relatively to the horizontal plane being 40-60.degree., preferably about 50.degree..
In accordance with the preferred embodiment the transfer unit consists of a vibrating conveyor.
The invention will be described in the following in more detail with reference to the accompanying drawing, wherein
FIG. 1 is a schematic lateral view showing a separating device in accordance with the invention.
FIG. 2 is an enlarged part view illustrating a cut-away portion of a magnetic plate incorporated in the separating device.
The separating device illustrated in FIG. 1 comprises a frame 1, having two side members 2, only one of which is shown in FIG. 1 and which members are inter-connected at their top by a yoke member 3. Each side member 2 is formed with a leg 4 the lower end of which is provided with an arcuate foot member 5 resting on a horizontal support 6. The yoke member 3 is formed with a suspension eye 7 in which engages a lifting hook (not shown) of a lifting and traversing crane (not shown).
The two side members 2 support a horizontal upper shaft 8 and a horizontal lower shaft 9 extending between the side members. An upper cylinder 10 is mounted on the upper sh
REFERENCES:
patent: 536226 (1895-03-01), McKinnon
patent: 673172 (1901-04-01), McKnight
patent: 3276581 (1966-10-01), Mayer et al.
patent: 3756401 (1973-09-01), Rosner
Patent Abstracts of Japan, vol. 7, No. 22 (C-148), Nov. 6, 1982, (JP-A-57-180442).
Almhults El Mek AB
Bollinger David H.
Dillon, Jr. Joe
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