JPS6254547B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drum type magnetic separator.
In a conventional drum-type magnetic separator, a plurality of magnets (electromagnets or permanent magnets) are arranged around the outer periphery of the drum, and adjacent magnets are arranged so as to have different polarities. In such a magnetic separator, the lines of magnetic force are continuous, so the magnetic substances are closely connected, and non-magnetic substances are included therein, impairing the magnetic separation effect, and furthermore, the magnetic substances are transferred onto the separation plate. Later on, it also had the disadvantage that it was difficult to disperse and move because it was subjected to the attractive force of the next pole, reducing the efficiency of magnetic separation.

The present invention aims to provide a magnetic separator that eliminates the above-mentioned drawbacks, and its gist is that a plurality of magnets arranged at required intervals around the outer periphery of a rotating cylindrical body all have the same polarity, and the magnet group This magnetic separator is characterized in that a magnetic separator plate is provided close to the outer periphery of the magnetic separator plate, and one end of a separation plate that gradually separates from the group of magnets is connected to a required part of the lower part of the magnetic separator plate.

The magnet used in the present magnetic separator may be either an electromagnet or a permanent magnet, and the magnetic separator plate shall be made of non-magnetic material. If the magnetic separator is small or the objects to be magnetically separated are mostly lightweight, FRP etc. It may be made of reinforced plastic, but usually austenitic stainless steel is used.

The present invention will be described in detail below with reference to the drawings.

A plurality of protruding magnets 2 are provided on the outer circumference of the rotating cylindrical body 1 along the longitudinal direction of the cylindrical body.
(see figure) or a plurality of projecting magnets 2 are protruded in a scattered manner (see figure 4), and these magnets are all magnetized so as to have north poles or south poles. A semi-cylindrical (see Fig. 1) or cylindrical (see Fig. 5) magnetic plate 3 made of a thin non-magnetic plate is placed close to the plurality of magnet groups, and as shown in Fig. When using a cylindrical magnetic selection plate, one end of its lower side is gradually extended away from the group of magnets,
The extended portion is used as a separating plate 4, and if the magnetic separator plate 3 is cylindrical as shown in Fig. 5, this one side end is connected to a required position on the lower side of the cylindrical magnetic separator plate. A separating plate 4 is installed so that it gradually separates from the magnet group.

In the figure, 5 is a hopper for supplying raw materials, 6 is a feeder, and this feeder is of a vibrating type to disperse the raw materials. Reference numeral 7 indicates a power source for the rotating cylindrical body, 8 indicates a hopper for collecting non-magnetic materials, and 10 indicates an overflow water inlet. In this invention, the raw material is fed from the upper feeder while rotating the rotating cylindrical body in the directions shown by the arrows in FIGS. 1 and 5. In this case, the inside of the rotating cylinder is a yoke, but the magnets arranged around the outer circumference of the rotating cylinder all have the same polarity, so the lines of magnetic force coming from the adjacent magnets are repelled by the outside of the magnetic poles. It emits certain lines of magnetic force,
A region where there are almost no lines of magnetic force is created between the magnetic poles. In other words, when adjacent magnets have different polarities, the lines of magnetic force formed there are as shown in FIG. 7, and the lines of magnetic force are dense even between the magnets. Now for the 8th
As shown in the figure, the lines of magnetic force coming out of each magnetic pole repel the lines of magnetic force coming out of the adjacent magnetic poles, and a portion where the density of lines of magnetic force is low is formed between the magnets.

Although the magnetic separator plate covering the outer periphery of the magnet group is not shown in Fig. 8, since the magnetic separator plate is made of a non-magnetic material, the state of the magnetic force lines even outside the magnetic separator plate is as follows. The situation is similar to that shown in the figure.

When a raw material is supplied to a place where magnetic lines of force are formed in such a state and the rotating cylinder is rotated in the direction of the arrow in Figs. It is attracted and advances as the magnet rotates, sliding on the surface of the magnetic selection plate with a slight delay in the movement of the magnet. In this way, the magnetic material that advances as the magnet moves usually always involves a certain amount of non-magnetic material. As shown in Figure 7, in the case of magnets with alternately different polarities, the lines of magnetic force are continuous without any breaks, so non-magnetic materials once wound up tend to remain wound up until the end. On the other hand, in the present invention, the magnetic material is in a standing state just like the lines of magnetic force in Figure 8, and in particular, there are almost no lines of magnetic force between the magnets. Since there are some parts that do not exist, the non-magnetic substances that have been rolled up are also separated as the magnet rotates, resulting in a great sorting effect. In this way, only the magnetic material finally moves to the top of the separation plate, passes over the separation plate to some extent, and when the magnetic attraction force becomes smaller than the gravity of the magnetic object, it falls and collects the magnetic material below. This is stored in the hopper. On the other hand, since non-magnetic materials are not subject to magnetic attraction, they initially move on the surface of the magnetic separation plate, but soon fall freely due to gravity, are separated from the magnetic materials, and are placed in the non-magnetic material collecting hopper below. Save. As described above, according to the present invention, the effect of separating magnetic materials and non-magnetic materials is great.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway front view of a dry type machine of the magnetic separator of the present invention, Figure 2 is a side view of the same, Figures 3 and 4 are perspective views of the rotating cylinder, respectively, and Figure 5 is the magnetic separator of the present invention. Of these, Fig. 6 is a partially cutaway front view of the wet type machine, Fig. 6 is a side view of the same, Fig. 7 is an explanatory diagram of the distribution of magnetic lines of force in a conventional magnetic separator, and Fig. 8 is a distribution of magnetic lines of force in the magnetic separator of the present invention. An explanatory diagram of the state. In the figure, 1: rotating cylindrical body, 2: magnet, 3: magnetic separation plate, 4: separation plate, 5: raw material supply hopper, 6:
Feeder, 7: Power source for rotating cylindrical body, 8: Hopper for collecting non-magnetic materials, 9: Hopper for collecting magnetic materials, 10: Overflow water inlet.

Claims (1)

[Claims] 1. A plurality of magnets arranged at required intervals around the outer periphery of a rotating cylindrical body are all of the same polarity, and a magnetic separator plate is placed close to the outer periphery of the group of magnets, and a magnetic separator plate is placed at the required part under the magnetic separator plate. A magnetic separator characterized in that one side end of a separation plate is provided in series so as to gradually separate from the group of magnets.