JPS6323962Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a magnetic material separation device used for, for example, separating sludge from grinding oil to be reused and recycling this grinding oil.

[Technical background of the invention]

Grinding oil is used in various grinding processes,
It is desirable to purify this grinding oil and reuse it. However, since the grinding oil used in the grinding machine contains sludge of various sizes, it is necessary to remove the sludge in order to regenerate the grinding oil.

As a means for removing sludge, there is a separation device that uses the magnetic force of a permanent magnet or an electromagnet to remove magnetic sludge from grinding oil, that is, dirty fluid.

In conventional separation devices, the lower part of a rotating drum made of a non-magnetic material is immersed in the flow of the dirty liquid in a separation tank in which dirty liquid flows from one side to the other. A magnet is arranged, and the drum is rotated by a drive device such as a motor. The sludge mixed in the dirty liquid is attracted to the surface of the drum by the attractive force of the permanent magnet, and the attracted sludge moves upward as the drum rotates and is scraped by a scraping plate that is in contact with the upper part of the drum. taken and expelled from the outside. Therefore, the grinding oil passing through the separation tank becomes a clean liquid because the sludge is adsorbed on the surface of the rotating drum, and this clean grinding oil can be reused.

By the way, in this type of separation device, when the magnetic sludge adsorbed on the surface of the rotating drum is scraped off by the scraping plate, grinding oil adheres to the surface of the sludge, and therefore the scraping plate scrapes the sludge box. If the sludge is dropped, the remaining grinding oil components will become sludge-like, making subsequent sludge treatment troublesome. For this purpose, a squeezing roller is placed in pressure contact with the upper part of the rotating drum, and as the rotating drum rotates, the squeezing roller is brought into contact with the rotating drum, and between these drums and rollers, the magnetic material adsorbed on the drum is compressed to release the grinding oil component. It is squeezed out and disposed of in a separation tank.

[Problems with background technology]

In such a structure, a fan-shaped magnet is used as a magnet for attracting the magnetic material to the rotating drum. Depending on the position of the fan-shaped magnet, for example, the direction in which lines of magnetic force emerge differs between the periphery and the center. For this reason, on the surface of the rotating drum, there are places where magnetic lines of force are generated in a direction perpendicular to the drum surface, and the sludge adsorbed to these parts assumes an upright position from the drum surface.

When the sludge standing up on the drum surface is compressed by the squeezing roller, the sludge pierces the squeezing roller, causing significant damage to the surface of the squeezing roller, and the squeezing roller with countless sludge stuck through it is exposed to grinding oil. This causes problems such as a reduction in the aperture efficiency.

[Purpose of invention]

The present invention was developed based on the above circumstances, and its purpose is to prevent magnetic materials such as sludge from standing up from the drum surface at the point where the rotating drum and the squeezing roller contact each other.
The present invention aims to provide a magnetic material separation device that eliminates damage to rollers and prevents reduction in squeezing efficiency.

[Summary of the idea]

To achieve the above-mentioned purpose, the present invention is such that the magnets facing the contact point between the rotating drum and the squeezing roller are spaced apart along the circumferential direction, and the polarities of these circumferentially spaced magnets are made to be different from each other. It is characterized by:

[Example of idea]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

In the figure, reference numeral 1 denotes a tank body, and this tank body 1 has a housing shape with an open top surface. The inside of the tank body 1 is divided into a plurality of rooms as shown in FIG. That is, 2 is a dirty liquid introduction chamber into which grinding oil mixed with magnetic sludge, that is, dirty liquid is sent, 3 is a separation layer that separates sludge from dirty liquid, and 4 is a dirty liquid introduction chamber into which grinding oil from which sludge has been removed, that is, clean liquid is sent. It is a clean liquid storage chamber. The separation layer 3 has a substantially arc-shaped bottom wall 5
The dirty liquid in the dirty liquid introducing chamber 2 overflows one edge of the bottom wall 5 and flows into the separation tank 3, and the clean liquid in the separation tank 3 flows into the other side of the bottom wall 5. It overflows the edge and flows into the clean liquid storage chamber 4. Therefore, within the separation tank 3, the liquid flows from one side to the other as shown by the arrow. As shown in FIG. 2, inside the separation tank 3, rectifying plates 6 are provided on the left and right sides, so that the flow of the liquid inside the separation tank 3 is directed toward the center in the axial direction. Further, 7 indicates a guide plate. The clean liquid in the clean liquid storage chamber 4 is taken out to the outside through the discharge hole 8.

A rotating drum 10 made of a non-magnetic material such as stainless steel is provided in the separation tank 3 so that its lower part is immersed in the flow of liquid. This drum 1
0 is rotated by means described later in a direction that coincides with the direction of liquid flow, that is, in the direction of arrow A in FIG.

A permanent magnet 11 is arranged inside the drum 10 so as not to rotate. The arrangement structure of the permanent magnets 11 will be explained later.

A fixed shaft 12 is attached to the tank body 1 as shown in FIG. The fixed shaft 12 has both ends attached to a bearing member 1 fixed to the tank body 1.
3 and 13 in a non-rotatable manner. Wheels 15, 15 are rotatably attached to both ends of this fixed shaft 12 via bearings 14, respectively, and the drum 10 described above is formed by these wheels 15, 15.
It is attached to 5. Therefore, the drum 10 is rotatable about the fixed shaft 12. Further, a holder 16 made of a magnetic material is non-rotatably fixed to the fixed shaft 12, and the permanent magnet 11 is attached to the outer circumference of the holder 16. Therefore, the permanent magnet 11 does not rotate, and only the drum 10, which is disposed on the outer circumferential surface of the permanent magnet 11 with a slight gap therebetween, is rotatable. The permanent magnet 11 is disposed within an angular range of about 270 degrees from the upstream part of the separation tank 3, and the rear end along the rotation direction of the drum 10 is provided with a magnet to weaken the magnetizing force or to move the magnet away from the drum 10. By this means, a damping magnetic force section 17 is formed in which the magnetic force is gradually attenuated in the direction of rotation.

A squeezing roller 18 is in rolling contact with the upper part of the drum 10. The squeezing roller 18 is made of oil-resistant rubber or the like, and its outer surface is pressed against the outer surface of the drum 10 so that it can be separated. The drive shaft 19 of the squeeze roller 18 is connected to a motor 20, so that the squeeze roller 18 is moved by the motor 20 in the direction of arrow B.
rotationally driven in the direction. Due to the rotation of the squeezing roller 18, the drum 1 to which this roller 18 is in pressure contact is
0 is rotated in the direction of arrow A by friction.

Note that the drive shaft 19 of the squeezing roller 18 has a bearing 2.
It is supported by bearing cases 22 and 22 via 1 and 21. The bearing cases 22, 22 are fitted into U-shaped grooves 24, 24 of support plates 23, 23 fixed to the tank body 1 so as to be slidable in the vertical direction. Coil springs 25, 25 shown in FIG. 3 are wound around the bearing cases 22, 22 in an inverted U shape, and both ends of the coil springs 25, 25 are connected to the support plates 23, 23. There is. Note that 26 is a bolt for adjusting the tension of the coil spring 25, and is fastened with a lock nut 27. Although the motor 20 is not shown in detail, there is a U-shaped cover 2.
8 and is movable up and down, but when the case of the motor 20 attempts to rotate, it hits the cover 28 and is blocked.

Further, as shown in FIG. 1, the tip of a scraping plate 30 is in sliding contact with the outer surface of the drum 10, located behind the damping magnet portion 17 of the permanent magnet 11. The scraping board 30 is attached to an inclined chute 31.

The arrangement structure of the permanent magnet 11 is shown in FIGS. 4 to 6.
As shown in the figure. FIG. 4 is a diagram showing the permanent magnet 11 in an expanded state. The permanent magnet 11 consists of a plurality of magnet pieces 35 divided in the axial direction, with intervals along the axial direction, or spacers 36 made of a magnetic material as shown in FIG. It is arranged as follows. The magnet pieces 35 adjacent in the axial direction are arranged so that their polarities are the same. Each of the magnet pieces 35 divided and arranged in the axial direction is arranged in the circumferential direction at the contact portion between the rotating drum 10 and the squeezing roller 18, that is, the contact line P-P shown in FIGS. 4 and 5. It extends to the front side. At the rear of each of these magnet pieces 35 in the drum rotation direction (indicated by arrow A), there is a
Two rear magnet pieces 37 are arranged. The rear magnet piece 37 is spaced apart from the front magnet piece 35 and is formed to have a different polarity from the front magnet piece 35.

The operation of the embodiment having such a configuration will be explained.

By connecting the motor 20 to a power source, the aperture roller 18 is rotated in the direction of arrow B, and this roller 1
Due to friction, the drum 10 in contact with the arrow A
rotated in the direction

Dirty liquid supplied to the dirty liquid introduction chamber 2,
In other words, the grinding oil mixed with sludge overflows and flows into the separation tank 3, and this dirty liquid flows in the direction of the arrow in the separation tank 3. Sludge in the dirty liquid flowing in the separation tank 3 is attracted to the outer surface of the drum 10 by the magnetic force of the permanent magnet 11. Therefore, the sludge is separated from the dirty liquid, and as the drum 10 rotates in the direction of arrow A, this sludge is carried to the upper part while being adsorbed on the surface of the drum 10. The grinding oil from which the sludge has been removed, that is, the clean fluid, is stored in the clean fluid storage chamber 4.
It overflows and is sent to the grinding oil tank of the grinding machine through the discharge hole 8.

When the sludge adsorbed on the drum 10 reaches the pressure contact area between the squeezing roller 18 and the drum 10, it is pressed by the close pressure contact between the rollers 18 and the drum 10, and as a result, the grinding oil remaining on the surface of the sludge and between the sludge is The components are squeezed out, and the squeezed out grinding oil passes between the drum 10 and the guide plate 7 and flows down into the separation tank 3.

When compressing sludge between the squeezing roller 18 and the drum 10, if coarse sludge is fed in, the roller 18 is pushed up to allow the coarse sludge to pass. Since the bearing cases 22, 22 supporting the roller 18 are drawn toward the tank body 1 by the coil springs 25, 25,
When a large lifting force acts on the roller 18, the bearing case 2 resists the urging force of the coil springs 25, 25.
2 and 22 are the U-shaped grooves 2 of the support plates 23 and 23.
4 and 24, the coarse sludge can pass through. Note that at this time, the motor 20 also moves integrally with the roller 18. However, the motor 20 is prevented from rotating by the cover 28.

The sludge that has passed through the contact area of the roller 18 is
When reaching the damping magnetic force section 17 of the permanent magnet 11, the magnetic attraction force received from the damping magnetic force section 17 gradually weakens, so that it is released from the force attracted to the outer surface of the drum 10. And then drum 1
0 rotation, it is scraped by the scraping plate 30 and transferred onto the scraping plate 30. The sludge on the scraping board falls through a chute 31 into a sludge box (not shown).

As a result, the sludge adsorbed to the surface of the rotating drum 10 is moved between the squeezing roller 18 and the drum 10.
Upon reaching the point of contact, this sludge is transferred to drum 1.
Take a prone position along the surface of 0. In other words, in the case of the permanent magnet 11, the drum 10 and the roller 18
It is separated into a magnet piece 35 and a rear magnet piece 37 in the circumferential direction, and these magnet pieces 3
5 and 37 have different polarities. As shown in FIG. 6, the lines of magnetic force generated between the magnet pieces 35 and 37 are as shown by the broken lines, so that the sludge lies in the same direction as the lines of magnetic force shown by the broken lines. Therefore, the sludge adsorbed on the surface of the drum 10 is laid down so as to be parallel to the surface of the drum 10 at the contact point P-P between the drum 10 and the roller 18. As a result, problems such as chips sticking into the surface of the roller 18 when the drum 10 and the roller 18 are pressed against each other are eliminated.

The arrangement structure of the permanent magnets 11 is not necessarily limited to that shown in FIG. 4, but may be arranged as shown in FIG. 7 or FIG. 8 as modified examples, respectively. In the example of FIG. 7, the distance between adjacent magnet pieces 35 is increased, and these magnet pieces 35...
are of different polarity, and these magnet pieces 35
... and rear magnet pieces 37 having different polarities and spaced apart in the circumferential direction are used. Further, in the example shown in FIG. 8, magnet pieces 3 having different polarities along the circumferential direction
5... and a rear magnet piece 37 are arranged. In any case, the magnet is divided in the circumferential direction with the contact line P-P between the drum 10 and the roller 18 as the border,
These divided magnets have a common feature in that they have mutually different polarities.

Further, in the above embodiment, the squeezing roller 18 is rotated by the motor 20, and the rotation of this roller is transmitted to the drum 10 by frictional force, thereby rotating the drum 10. However, in the present invention, the rotation of the motor is It is also possible to transmit force to the drum using gears, chains, etc. to rotate the drum, and transmit the rotation of the drum 10 to the squeezing roller to cause the roller to follow the rotation.

Furthermore, an electromagnet may be used instead of the permanent magnet as a magnetic force generation source for attracting the magnetic material to the drum 10.

Furthermore, the present invention is not only used for separating sludge from grinding oil, but can also be applied to mining, etc.

[Effect of idea]

As described above, according to the present invention, the magnets are spaced apart in the circumferential direction at the point where the rotating drum and the squeezing roller contact each other, and the polarities of these circumferentially spaced magnets are made to be different from each other. The lines of magnetic force come to follow the surface of the drum, and the magnetic material attracted to the drum surface is placed face down along the drum surface. Therefore, the magnetic material is less likely to stick into the squeezing roller, reducing damage to the roller and extending its life, and since the magnetic material does not adhere to the roller surface, deterioration of the separating function and squeezing function is prevented.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the present invention, in which FIG. 1 is a sectional view, FIG. 2 is a sectional view taken along the line - in FIG. visual view,
Figure 4 is a developed view showing the arrangement of the magnets, Figure 5 is the
6 is an explanatory view of the action. FIGS. 7 and 8 are developed views showing the magnet arrangement of other embodiments of the present invention, respectively. 1...Tank body, 2...Dirty liquid introduction chamber,
3...Separation tank, 4...Clean liquid storage chamber, 10...
Rotating drum, 11... Permanent magnet, 18... Squeezing roller, 20... Motor, 30... Scraping plate, 35...
... Magnet piece, 37... Rear magnet piece.

Claims (1)

[Scope of utility model claims] The lower part of a rotating drum made of non-magnetic material is immersed in dirty liquid mixed with magnetic material, and
A magnet is disposed non-rotatably on the inner circumference of the rotating drum, and a squeezing roller made of a rubber-based elastic material is rotatably pressed against the upper part of the rotating drum, and the magnetic attraction force of the magnet causes the dirt to be removed. The magnetic material in the liquid is attracted to the outer surface of a rotating drum, and as the rotating drum rotates, the magnetic material adsorbed to the outer surface is compressed by a squeezing roller, thereby reducing the liquid component that is attached to the magnetic material. In a magnetic material separation device that squeezes a magnetic material, the magnets facing the rotating drum where the squeezing roller is pressed are spaced apart from each other in the circumferential direction, and the magnets spaced apart from each other in the circumferential direction have mutual polarity. A device for separating magnetic substances, characterized in that the magnetic substances are arranged so that the