JPH07303810A - Magnetic separator - Google Patents

Abstract

PURPOSE:To enhance the separation efficiency of a suspended magnetic particle by a magnetic separator by arranging a reticular magnetic substance in an annular flow path to be acted upon by a magnetic field and making permanent magnets rotate. CONSTITUTION:A magnetic separator is composed of an inner cylinder 2 incorporating permanent magnets 6 (including intermagnetic polar iron pieces), an outer cylinder 4 with a notch in part thereof, a reticular magnetic substance 5 laminated on an annular flow path 1 between both cylinders, a container 9 which has a liquid inlet 12 and a liquid outlet 15 and forms integrally with the outer cylinder 4, encircling the notch, a device to rotate the permanent magnets 6, and a sludge discharge device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic separator for removing magnetic particles such as iron powder suspended in a liquid such as cleaning oil or grinding coolant.

[0002]

2. Description of the Related Art Conventionally, as this type of device, for example,
The one as shown in FIG. 4 is used. Referring to the drawings, a is a container, b is a magnetic drum rotatably attached to the container a, c is a scraper, d is a liquid inlet, e is a liquid outlet, and f is a sludge tank. The liquid in which magnetic particles such as iron powder are suspended flows into the container a through the liquid inlet d and flows in contact with the lower half surface of the magnet drum b, and the suspended magnetic particles adhere to the surface of the magnet drum b by magnetic force. The liquid from which the suspended magnetic particles have been removed flows out from the liquid outlet e. The magnetic particles adhering to the surface of the magnet drum b come out on the liquid surface as the magnet drum b rotates, are scooped by the scraper c, and fall into the sludge tank f. By the way, in this conventional technique, since the magnetic force acting on the suspended magnetic particles becomes weaker as the distance from the surface of the magnet drum b increases, a part of the suspended magnetic particles located far from the surface of the magnet drum b is magnetized. It cannot be attracted to the surface of the drum b and flows out together with the liquid from the liquid outlet e. Therefore, there is a drawback that the separation efficiency is low.

[0003]

The problem to be solved by the present invention is to increase the separation efficiency of suspended magnetic particles by a magnetic separator.

[0004]

In order to solve the above-mentioned problems, the magnetic separator according to the present invention is arranged such that a reticulated magnetic body is arranged in an annular flow path where a magnetic field acts to capture suspended magnetic particles, A mass of magnetic particles is formed, and a plurality of permanent magnets are rotated so as to be separated from the mesh-like magnetic body, moved, collected and discharged at one place, and suspended over the entire width of the annular flow path. The turbid magnetic particles can be efficiently removed. That is, the magnetic separator according to the present invention includes an inner cylinder having a plurality of permanent magnets (including one having iron pieces between magnetic poles), an outer cylinder having a cutout in a part thereof, and an annular flow path between the both cylinders. And a container having a liquid inlet and a liquid outlet and surrounding the cutout and being integrated with the outer cylinder, and a device for rotating the plurality of permanent magnets. , A sludge discharge device. The mesh-like magnetic body is arranged so as to cross the annular flow path, one end of which is in contact with the outer cylinder surface, and the other end is arranged with a space from the inner cylinder surface. This is the structure.

[0005]

The liquid in which magnetic particles such as iron powder are suspended flows through the annular channel, and the magnetic particles of the permanent magnets act strongly on the suspended magnetic particles near the surface of the inner cylinder. Is attracted to the inner cylinder surface. The magnetic field of the permanent magnet is weak in the place far from the inner cylinder surface, but the magnetic field lines h around the fine line g are concentrated toward the fine line g as shown in FIG. Since it is high, a strong magnetic force acts, and the suspended magnetic particles quickly adhere to the fine line g to form a magnetic particle nodule i. Then, as shown in FIG. 6 (1), the magnetic particle nodules i and the thin wires g are magnetized by the magnetic field of the permanent magnet j, and at the boundary between the magnetic particle nodules i and the thin wires g, they are magnetized to have different polarities and attractive force acts. And they are attached to each other. When the permanent magnet moves in the direction of the arrow in the figure to reach the state of FIG. 6 (2), as shown in the figure, the boundary is still magnetized with a different polarity and attracted by the attractive force. However, the permanent magnet moves further in the direction of the arrow shown in FIG.
In the state (3), as shown in the figure, the boundary is magnetized to have the same polarity and a repulsive force acts to pull the magnetic particle nodules i away from the thin line g in the direction of the arrow F in the figure. If the magnetic particle nodules i are small, the magnetic particle nodules i will only swirl in the vicinity of the thin lines g even if the direction of magnetization of the thin lines g changes. do. In this way, the suspended magnetic particles, regardless of where they are in the annular flow path, are eventually attracted to the inner cylinder surface. Then, the liquid from which the suspended magnetic particles have been removed flows out from the other end of the annular channel. The agglomerates of magnetic particles attracted to the surface of the inner cylinder are rotated by the rotation of a plurality of permanent magnets (with iron pieces between magnetic poles) provided inside the inner cylinder, or with the inner cylinder and a plurality of permanent magnets (without iron pieces between magnetic poles). ) Both move by rotation as a unit. To explain the former case, the magnetic particle agglomerates attracted to the surface of the inner cylinder are pulled by magnetic force as the permanent magnet rotates, and slide on the surface of the inner cylinder. That is, as shown in FIG. 7, magnetic force lines h near the surface of the inner cylinder between the magnetic poles.
In the distribution of, there is distortion due to the iron piece k between the magnetic poles, and the magnetic gradient is tangential to the surface of the inner cylinder. Therefore, the force in the direction of the arrow F in the figure acts on the magnetic particle nodule i
The magnetic particle nodule i slides on the inner cylinder surface in the same direction as the permanent magnet moves. Since there is a space between the inner cylinder surface and the net-like magnetic body, the movement on the inner cylinder surface is smoothly performed without being hindered by the net-like magnetic body.
In the latter case, that is, when the inner cylinder and a plurality of permanent magnets inside the inner cylinder (without iron pieces between magnetic poles) are rotated integrally, the magnetic particle nodules remain attached to the inner cylinder surface. Move in the state. As described above, the suspended magnetic particles are attracted to the surface of the inner cylinder, collected, moved, accumulated, and then carried away by the sludge discharging device.

[0006]

【Example】

(First Embodiment) In FIG. 1 showing a first embodiment of the present invention, an annular flow path 1 includes an inner cylinder 2, an outer cylinder 4 having a notch 3 in a part thereof, and both end surfaces of an annular portion between the both cylinders. It is formed by a plate (not shown) that closes. The mesh-shaped magnetic body 5 is formed so as to traverse the annular flow path 1, one end of which is in contact with the outer cylinder 4, and the other end of which is spaced from the surface of the inner cylinder 2. It is installed by stacking it on the approximately semicircle of. Specifically, the mesh-shaped magnetic body 5 has an opening of 2 mm.
Expanded metal made of magnetic stainless steel with a thickness of about 3 mm and a plate thickness of about 0.3 mm is suitable. A plurality of permanent magnets 6 and a plurality of iron pieces 7 between magnetic poles are attached to a boss 8 so as to be integrated with each other, and are rotatably provided inside the inner cylinder 2 so that liquid in the annular flow path 1 can be rotated by a motor (not shown). Is driven to rotate in the direction along the flow of. The container 9 is provided below the notch 3 so as to surround the notch 3 and forms a liquid-tight container body 10 integrally with the outer cylinder 4. The partition plate 11 is provided at a position away from one end of the notch 3 so as to partition a part of the space of the container 9, and forms a flow path 13 that communicates with the annular flow path 1 from the liquid inlet 12. The baffle plate 14 is provided in the container 9 at a position distant from the other end of the notch 3 and forms an outlet channel 16 communicating with the liquid channel 15 from the annular channel 1. Figure 1
The middle part 17 shows a sludge discharging device, which is composed of a conveyor 18 and a screw feeder 19. The conveyor 18 having a plurality of projections 20 on the outer circumference over the entire length in the axial direction is rotatably attached with a slight gap provided between the conveyor 18 and the inner cylinder 2. Then, the conveyor 18 is rotationally driven in the direction opposite to the rotational direction of the permanent magnet 6 by a motor (not shown) via a shaft (not shown) that penetrates the side plate of the container 9 and is sealed in a liquid-tight manner.
The screw feeder 19 is for discharging the sludge settled on the bottom of the container 9, and removes the cap 21 and rotates the screw 23 with the handle 22 to discharge the sludge. The inner cylinder 2, the outer cylinder 4, the container 9, the partition plate 11 and the baffle plate 14 are made of a non-magnetic material, preferably non-magnetic stainless steel. (Second Embodiment) FIG. 2 is a view showing a second embodiment of the present invention. The difference from the first embodiment is that the notch 3 of the outer cylinder 4 is disposed above the inner cylinder 2 and the container is 9 is provided on the upper portion of the notch 3 to be integrated with the outer cylinder 4, and the container body 10 is opened at the upper portion. Further, the sludge discharging means is the conveyor 18 having the plurality of protrusions 20.
In addition, 24 in FIG. 2 shows a sludge tank. The other parts are given the same numbers as in the first embodiment, so a detailed description is omitted. (Third Embodiment) FIG. 3 is a view showing a third embodiment of the present invention. The difference from the second embodiment is that the inner cylinder 2, the plurality of permanent magnets 6 and the boss 8 are integrated into one. And the scraper 25 is used as the sludge discharging means. The third embodiment is different from the second embodiment in that the iron piece between magnetic poles, the partition plate and the baffle plate are not provided. The other parts are given the same numbers as in the second embodiment, so a detailed description is omitted.

[0007]

As is apparent from the above description, in the magnetic separator of the present invention, a reticulated magnetic body is arranged in the annular flow path where a magnetic field acts to trap suspended magnetic particles to form agglomerated magnetic particles. By rotating multiple permanent magnets to separate them from the net-like magnetic material, move them, and collect and discharge them in one place, suspended magnetic particles can be efficiently removed over the entire width of the annular channel. It becomes possible to improve the separation efficiency.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of a magnetic separator according to the present invention.

FIG. 2 is a diagram showing a second embodiment of the magnetic separator according to the present invention.

FIG. 3 is a diagram showing a third embodiment of the magnetic separator according to the present invention.

FIG. 4 is a schematic view of a conventional magnetic separator.

FIG. 5 is an explanatory view of the action of a reticulated magnetic body.

FIG. 6 is an explanatory view of the operation of the magnetic separator according to the present invention.

FIG. 7 is an explanatory view of the operation of the magnetic separator according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Annular flow path 11 Partition plate 2 Inner cylinder 12 Liquid inlet 4 Outer cylinder 14 Baffle plate 5 Reticulated magnetic body 15 Liquid outlet 6 Permanent magnet 18 Conveyor 7 Inter-pole iron piece 19 Screw feeder 9 Container 25 Scraper

Claims (1)

[Claims] 1. An inner cylinder containing a plurality of permanent magnets (including one having an iron piece between magnetic poles), an outer cylinder having a notch in a part thereof, and a laminate arranged in an annular flow path between the both cylinders. By a net-like magnetic body provided, a container having a liquid inlet and a liquid outlet and surrounding the notch and being integrated with the outer cylinder, a device for rotating the plurality of permanent magnets, and a sludge discharge device. A magnetic separator characterized by being configured.