JPH0156829B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an apparatus that uses magnetism to separate a mixture of magnetic and non-magnetic objects into magnetic objects and non-magnetic objects. It is.

[Prior Art] Conventional magnetic separation devices include those in which magnetic bodies made of permanent magnets or electromagnets are installed on both sides of a path for a non-separable object that is a mixture of magnetic and non-magnetic objects;
A method has been known in which the magnetic object is moved through the non-separable object, whereby the magnetic object is attracted to the magnetic object and separated.

[Problems to be Solved by the Invention] Conventional magnetic separation devices such as those described above do not perform complete separation, and in particular cannot completely separate dust and the like made up of small magnetic objects attached to non-magnetic objects. There was a problem.

This invention was made in order to solve this problem, and provides a magnetic separation device that completely separates magnetic objects and non-magnetic objects even if the object to be separated is a mixture of magnetic objects that are smaller than non-magnetic objects. The purpose is to obtain.

[Means for Solving the Problems] A magnetic separation device according to the present invention is magnetized so that an N pole and an S pole appear only on one side, and one or more holes are provided between the two magnetic poles. A spacer is inserted into the periphery between the two magnetic plates, so that the same magnetic poles are facing each other. It is configured to be filled with magnetic fluid.

[Function] In the magnetic separation device of the present invention, two magnetic plates are magnetized so that the north and south magnetic poles appear only on one side, and a spacer is inserted between them so that the same magnetic poles face each other. Because they are stacked against the repulsive force, a gap is formed between the two magnetic plates with a highly cooperative magnetic field. Since this gap is filled with magnetic fluid, all of the magnetic objects in the object to be separated that pass through the film of magnetic fluid are captured by the magnetic fluid. Further, since non-magnetic objects having a specific gravity smaller than that of the magnetic fluid float above the magnetic fluid, this property can be used to separate non-magnetic objects based on the difference in specific gravity.

[Example] Fig. 1 is a cross-sectional view showing the configuration of a magnetic separation device which is an embodiment of the present invention, Fig. 2 is a perspective view showing the constituent members of the magnetic separation device, and Fig. 3 is a cross-sectional view showing the configuration of the magnetic separation device as described above. FIG. 2 is a cross-sectional view showing lines of magnetic force. In the figure, 1 is a magnet plate made of, for example, a ferrite sintered body and magnetized so that the N and S poles appear only on one side, 2 is a spacer, and 3 is a magnet plate made of, for example, ferrite powder and silicone oil. Mixed magnetic fluid, 4 is case A, 5 is case B, 6 is a hole provided between both magnetic poles of magnet plate 1 for passing the object to be separated, 7 is a non-magnetic object in the object to be separated, 8
9 is a magnetic object in the object to be separated; 9 is a light non-magnetic object such as dust with a small specific gravity; and 10 is an injection hole for injecting the magnetic fluid 3. As shown in FIG. 1, the magnetic plate 1 is provided with one or more of the holes 6 and the injection hole 10 between both magnetic poles, and the two magnetic plates 1 have the magnetic poles exposed. The spacer 2 is placed between the two so that the same magnetic poles of the surfaces face each other and the holes 6 face each other.
Since the case A4 and the case B5 overlap each other against the repulsive force of the repulsive magnetic field, the lines of magnetic force are formed between the magnetic plates 1 and 1 as shown in FIG. Inside the gap, the density is extremely high, creating a strong magnetic field. Therefore, when the magnetic fluid 3 is injected into the gap through the injection hole 10, it is supported by a strong magnetic field and is held in the form of a film without flowing out from the holes 6 or injection hole 10. Then, when the object to be separated, which is a mixture of the magnetic object 8 and the non-magnetic objects 7 and 9, is dropped into the hole 6 from above, the magnetic object 8 in the object to be separated will reach the two magnetic poles of the magnet plate 1. The non-magnetic object 7 with a higher specific gravity than the magnetic fluid 3 among the non-magnetic objects passes through the hole 6 and falls, and the light non-magnetic object 9 with a lower specific gravity falls onto the film of the magnetic fluid 3. They float to the surface and are separated. In this case, as shown in FIG.
and light non-magnetic objects 9.

It should be noted that the present invention is not limited to the above-described embodiments, and the shape, the position of the magnetic poles, etc. can be changed without departing from the gist of the invention.

[Effects of the Invention] As explained above, the present invention is a magnetic separation device that is magnetized so that the north and south magnetic poles appear only on one side, and one or more holes are provided between the two magnetic poles. Two magnetic plates with the same magnetism face each other,
The holes between the two magnetic poles are arranged to face each other, and the two magnetic plates are stacked with a spacer sandwiched between them at the peripheral edge, and the gap formed between the two is filled with magnetic fluid. Since the non-magnetic object was made to pass through the magnetic fluid film held in the hole between the two magnetic poles, the magnetic object was completely removed by the strong magnetic field formed between the two magnetic plates.
Since the object to be separated passes through the magnetic fluid, light non-magnetic objects having the specific gravity of the magnetic fluid are also separated, and in particular, small magnetic objects and small light non-magnetic objects attached to the surface of the non-magnetic object can be efficiently and completely separated. It has the excellent effect of being able to

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the configuration of a magnetic separation device that is an embodiment of the present invention, FIG. 2 is a perspective view showing the constituent members of the magnetic separation device, and FIG. 3 is a diagram showing lines of magnetic force of the magnetic separation device. FIG. In the figure, 1... magnet plate, 2... spacer,
3...Magnetic fluid, 4...Case A, 5...Case B, 6...Hole, 7...Non-magnetic object, 8...Magnetic object, 9...Light non-magnetic object, 10...In injection hole be. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1. Two magnetic plates are magnetized so that the N and S poles appear only on one side, and one or more holes are provided between the two magnetic poles, and the same magnetic poles are facing each other and The holes between the two magnetic poles are made to face each other, and a spacer is sandwiched between the two magnetic plates to overlap each other, and the gap formed between the two magnetic plates is filled with magnetic fluid. A magnetic separation device featuring: