SU1374171A1 - Method and apparatus for magnetic separation of single-component electrographic developer - Google Patents

Abstract

The invention relates to a method for magnetic separation of a single-component electrographic developer. Allows to increase separation efficiency. The separator is fed to the working surface of the outer cylinder 1. Inside the cylinder 1 there is a multi-pole shaft 2. Under the influence of magnetic field forces, the non-magnetic and weakly magnetic particles are carried immediately to the cleaning zone, where the brush 10 removes them. Magnetic particles periodically enter the zone of concentration of the magnetic field directly below each of the bands 3. Under each of the bands 3 of the magnetically soft material, the gradient of the magnetic field sharply increases, which leads to the destruction of particle aggregates. At the same time, the particles are simultaneously charged with a flow of ION0B corona generated by electrodes 6. This leads to sticking of flat particles and dust-like fraction to the surface of cylinder 1, then in the cleaning zone they are removed with a brush 10. The quality fraction of the developer is removed and in the bunker 12. 1 sec. and 1 hp f-ly, 1 ill. from 9 (L

Description

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The invention relates to electroraffy, in particular to methods of magnet separation of one-component magnetosensitive manufacturers.

The aim of the invention is to increase the separation efficiency.

The method is carried out as follows.

A one-component electrographic extender is placed on the moving separator transorter. The rotor is affected by a spatially periodic magnetic field. At the same time, destruction of aggregates of particles of the developer is carried out by folding concentrators along the working surface of the separator conveyor. In the zone of aggregate destruction, the particles of the developer are charged with a stream of ions.

The drawing shows a device for implementing this method.

The device contains a rotating non-magnetic separator cylinder 1. Inside cylinder 1 there is a multi-pole magnetic shaft 2. The magnetic field concentrators are filled in the form of a series of 3 strips of magnetically soft material. The lanes 3 are installed above the parator cylinder 1 parallel to its generator. The device comprises means 4 for supplying the propeller to a separator cylinder and means 5 for separating the separated fractions. The device contains an additional drive (not shown) for rotating the magnetic shaft and the corona electrodes 6. The strips 3 are mounted on the elastic elements 7. The corona electrodes 6 are spaced between the strips 3.

The device works as follows.

The developer to be separated from the feed bin 8 is fed to the means 4, from which, under the action of magnetic field forces, the developer hits the working surface of the outer cylinder 1. A part of the non-magnetic and weakly magnetic particles 9 is immediately carried away on the surface of the cylinder 1 rotating clockwise, to the cleaning zone, where the brush 10 removes them, the Non-magnetic and weakly-magnetic particles are removed by the air flow of the fan 11. The magnetic particles, including. isometric fraction (non-flat), flat and lv-shaped particles, in the form of / chains (aggregates), including

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between the particles of the weakly magnetic and partially non-magnetic fraction, under the action of the floor, which rotates clockwise the multipolar magnetic shaft 2, moves counterclockwise along the surface of the outer cylinder 1. Periodically, the magnetic field enters the zone of concentration directly below each of the bands 3, where the gradient of the magnetic field increases sharply, the aggregates are destroyed, decaying into individual particles, while simultaneously being charged with a stream of ions of corona discharge created by electrodes 6. At This flat charged particles and the piqued fraction, charged by the ions deposited on them, stick on the surface of the cylinder and are carried along to the cleaning zone, where they are removed with a brush 10.

Although the planar particles are charged, they are electrically interacting with the surface of the cylinder 1 by an order of magnitude or more than that of the flat particles due to a much smaller area of their contact with the surface of the cylinder. As a result, such particles, freed from flat and dust-like particles, as well as weakly magnetic particles, under the action of an alternating magnetic field of a rotating magnetic shaft 2 continue to move on the surface of cylinder 1 counterclockwise opposite to the direction of movement of the surface of cylinder 1 are removed by means 5 and enter the hopper 12, in which the separated quality developer 13 accumulates, due to the fact that the plates 3 are fixed on the elastic elements 7 from interacting with the rotating magnetic field multipolar shaft 2, they vibrate, causing a vibration zones of concentration of the magnetic field and to an even greater extent contributing to the destruction of agglomerates and particles povsheniyu separation efficiency. At the same time, these oscillations prevent the dust fraction from sticking to the strips 3 and the corona electrodes 6 by oscillating air.

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Claims (2)

1. Method of magnetic separation of one-component electrographic 31 including movement of its particles along a moving separator conveyor in a spatially periodic magnetic field with simultaneous destruction of aggregates of particles by magnetic field concentrators and separation of magnetic and nonmagnetic fractions from separator tape, characterized in that, in order to increase separation efficiency, the destruction of aggregates is carried out by oscillations of concentrators along the working surface of the separator conveyor, while in the zone of destruction of the aggregates the developer particles are charged ion flow. 2. Magnetic separation device of a one-component electrographic reader, containing a rotating non-magnetic separator cylinder. one 714 located inside it is a multi-pole magnetic shaft, magnetic field concentrators, made in a series of strips of magnetically soft material, located above the separator cylinder parallel to it, means for supplying the developer to the separator cylinder and means for separating the separated fractions, characterized in that increasing the separation efficiency, it has an additional drive for rotating the magnetic shaft and the corona electrodes, while the strips of a magnet material are mounted on elastic lementah to produce their oscillation mnogopolngsnogo while rotating the magnetic roller, and the discharge electrodes are located between the stripes of magnetic material.