JPS61118153A - Magnet filter - Google Patents

Abstract

PURPOSE:To make the titled apparatus compact by combing alternately two homopoles and two counter poles on the outside peripheral surface of a filter cylinder to provide a magnet, adsorbing the magnetic suspended matter by the strong magnetic field, transferring efficiently the adsorbed suspended matter and discharging it. CONSTITUTION:The suspension 9 is flowed into a filter cylinder 1 and the magnetic suspended matter is magnetized by a magnet which is provided by combining alternately two homopoles and two counter poles on the outside peripheral surface of the filter cylinder and adsorbed on the inside surface of the filter cylinder. The magnetic induction effect is more accelerated by the centrifugal force which is caused by the rotation of a screw conveyor 4 and nonmagnetic suspended matter is pushed up by the screw conveyor and transferred to a discharge port 11 together with the magnetic suspended matter and allowed to fall into a tank 15. The filtrate separated from the suspended matter is overflowed from a discharge port of filtrate and flowed down into a filtrate vessel 16.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a magnet rotatably provided in a filtration cylinder having a large number of magnet plates on its outer circumferential surface, with a screw conveyor close to the inner wall surface of the filtration cylinder. This relates to a filtration device, in which the polarity of the magnetic plates is arranged alternately and continuously in pairs of two of the same polarity and two of opposite polarity, and the pitch of the screw blades of the screw conveyor is reduced in the direction of transport of the suspended material. The shaft of the screw conveyor is made of magnetic material.

[Conventional technology]

Conventionally, there are devices that can remove relatively coarse chips from magnetic suspensions, such as chips contained in the coolant of machine tools, but there is no device that can remove fine particles. Therefore, there has been a problem that these fine particles of chips are collected and precipitated in the coolant tank together with the cutting fluid. That is, there was a defect in that the unused chips settled in the coolant tank, the tank became insufficient in volume, and the cutting fluid overflowed from the tank.

Furthermore, if the unremoved Shiun chips circulate together with the cutting fluid, the discharge nozzle will become clogged, resulting in damage to the tool or defects in the machined workpiece.Also, in machining centers, it may cause poor setting during automatic tool exchange, resulting in poor machining accuracy. There were problems such as a decrease in

To deal with these problems, conventional devices have been used that have a screw conveyor installed at the bottom of the coolant tank to transfer and remove the chips that have settled at the bottom of the tank. The equipment is often installed horizontally due to the transfer capacity of the conveyor, and it has been impossible to reduce the installation area.

-Also, a device is used in which a magnetic plate is placed at the bottom of the coolant tank, and the chips are attracted to the bottom of the tank by magnetic force, and the chips are scraped up with a scraper or the like to be removed. In order to increase the adsorption effect of the magnetic plate, it is necessary to increase the installation area of the magnetic plate, and a large scraper must also be installed accordingly, resulting in an increase in the size of the device and equipment cost. Became.

[Problem that the invention seeks to solve]

The present invention solves the above-mentioned problems of conventional magnetic suspension removal devices such as chips, and removes magnetic suspension and non-magnetic suspension all over the inside of the filter cylinder. Due to the strong magnetic field created, most of the particles are adsorbed to the inner surface of the filter cylinder,
The main purpose of the present invention is to efficiently transfer and discharge adsorbed suspended matter, and another purpose of the present invention is to reduce the volume and installation area of the device, reduce the equipment cost and operating cost of the device, and The goal is to make equipment maintenance and management simple and easy.

[Means for solving problems]

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a filter cylinder made of a non-magnetic material such as stainless steel, which is arranged at an inclination angle of usually 10 to 90 degrees with respect to a horizontal plane. A large number of magnet plates 2 are arranged at intervals on the outer circumferential surface of the filter cylinder l. In this case, as shown in FIG. Same polarity), S (opposite polarity), S (opposite polarity).

N (same pole), N (same pole), S (opposite pole), S (opposite pole)...
By combining two items of the same polarity and arranging them alternately and continuously, the rise of the magnetic field reaches the center of the filter cylinder l, making it possible to form a comprehensive and strong magnetic field.

Set the polarity of the magnetic plates to N (same polarity) as shown in Figure 3.

If S (opposite poles), N (same poles), and S (opposite poles) are simply arranged in succession, the magnetic field will not rise well and will not reach the center of the filter cylinder, resulting in no magnetic field being formed. In this part, the magnetic suspended matter in the liquid flows out of the filter cylinder 1 without being captured, so the present invention has been improved as described above.

As the magnet plate 2, a permanent magnet such as a ferrite magnet or a rare earth magnet can be used.The shape of the magnet plate 2 is preferably a polygon such as a triangle or a quadrangle, and its size is lθ~
It is most desirable to have an area of 40 cm2 and a thickness of 1 to 3 cm.

Usually, 30
~300 pieces are arranged at intervals, but the magnetic plate 2
The mutual spacing is set to 1 to 5c11, and the magnet plates 2 may be arranged in a mosaic or staggered pattern.An outer cylinder 3 is attached to the outside of the magnet plates 2.

A screw conveyor 4 made of a non-magnetic material is rotatably inserted in close proximity to the inner part of the product filtration cylinder 1. As shown in FIG. The size of the magnetic suspension 7 is gradually reduced in the transport direction.

The reason why the pitch interval of the screw blades 6 is gradually reduced in the transport direction of the magnetic suspension 7 is because the magnetic force of a magnet is inversely proportional to the square of the distance, so that the magnetic suspension 7 adsorbed on the inner surface of the filter cylinder 1 is The screw conveyor 4 transports the magnetic suspension 7 upward along the inner surface of the filter tube 1, and as the inner surface of the filter tube 1 moves upward, the layer of the magnetic suspended matter 7 adsorbed becomes thicker and the amount increases, and the magnetic force of the 1 m stone plate 2 increases. In other words, since the adsorption ability of the magnetic suspension 7 becomes weaker, the magnetic suspension 7 above the inner surface of the W1 over-cylinder l
This is to increase the scraping ability, that is, the peeling ability, to strengthen the adsorption ability, and to improve the transfer ability.

The shaft 8 of the screw conveyor 4 is made of magnetic material because of the synergistic effect of the magnetic force between the magnet plate 2 and the shaft 8.
As the magnetic force increases by about 50%, a strong magnetic force is also generated around the shaft 8, so as shown in Figure 2,
This further promotes the formation of a strong magnetic field over the entire interior of the filter cylinder.

As mentioned above, when the shaft 8 of the screw conveyor 4 is magnetically polished and placed within the range of the magnetic field of the magnet plate 2, the collection rate of magnetic suspension is clearly shown in the collection rate of item 7. It turns out to be excellent.

When the shaft of the screw conveyor is m-shaped (150
1/sin) When the shaft of the screw conveyor is non-magnetic (15017 layers in) The upper end of the shaft 8 of the screw conveyor 4 is connected to the motor 17 via the transmission part 12 of the working box 10 attached to the upper part of the filter cylinder l. do.

A suspended matter discharge port 11 is provided in the upper part of the filter cylinder 1, and a filtrate discharge row 4 is provided in the lower part thereof.

Further, a suspension inflow Ot3 is provided at an intermediate position between the suspension discharge port 11 and the filtrate discharge row 4.

Note that the bottom of the filter cylinder 1 is installed in the filtrate tank IB, but i!
! The opening of the liquid discharge row 4 is located above the liquid level of the filtrate tank 18, and the suspended matter discharge port 11 is brought into contact with the storage tank 15.

[Operation and effect of the invention]

Next, the operation of the magnetic filtration device of the present invention will be explained.

Because the plate 2-$ is arranged, a strong magnetic force acts on the center of the filter cylinder l, and the magnetic suspension 7 in the suspension is easily magnetized by the magnetic force action, and the magnetic suspension 7 in the suspension is magnetized. While the suspended matter is mutually adsorbed and granulated, non-magnetic suspended matter is also trapped and adsorbed to the inner claw surface of the filter cylinder (magnetic induction effect).

Further, the suspension 9 in the filter cylinder 1 is transferred to the screw conveyor 4.
Due to the centrifugal force generated by the rotation of the filter cylinder L, the centrifugal force comes into contact with the inner surface of the filter cylinder l, and the 1m suspension 7 also comes into contact with the inner surface of the filter cylinder l, making it easier to be adsorbed, resulting in magnetic 5 & induction effects. (cyclone effect).

The magnetic suspension 7, which has been efficiently magnetized by the synergistic effect of the magnetic induction effect and the cyclone effect, causes a strong agglomeration reaction due to the magnetic force between the poles whose magnitude is proportional to the synergistic product of the mutually held magnetic quantities. By adsorbing each other and granulating them, it is possible to further improve the adsorption property to the inner surface of the filter cylinder l.

In particular, in the aggregation reaction, since the non-magnetic suspended matter is also trapped together with the magnetic suspended matter 7, the entire suspended matter can be adsorbed onto the filter cylinder 1 very effectively. Effect) A part of the non-magnetic suspension is bound by the magnetic suspension 7 and adsorbed to the inner wall surface of the filter cylinder 1, but the non-magnetic suspension that is not adsorbed falls to the bottom of the filter cylinder 1, but the screw conveyor 4
, the wall surface of the filter cylinder 1 is pushed upward again, and the magnetic suspension 7 is transferred to the suspension discharge port 11, from which it is transferred to the tank! 5 (transportation effect).

The rotational speed of the screw conveyor 4 is appropriately determined depending on the flow rate of the suspension 9, the concentration of the suspended matter, the strength of the magnetic force and the number of magnetic plates 2, the pitch of the screw blades 6, etc.1, and is usually 8 to 80 rpm. within the range of

On the other hand, the filtrate 5 from which the magnetic suspension 7 has been separated is transferred to the filtrate outlet 1
4 and flows down into the filtrate tank 1B.

If the tube having the filtrate outlet 14 is made into a stand-up tube shape as shown in FIG. 1, the flow rate of the filtrate 5 near the filtrate outlet 14 will be slower than the flow rate inside the filter cylinder l! ! ! (7)
Even if a small amount of residual non-magnetic suspension is present, the residual non-magnetic suspension can be precipitated by gravity, and the filtration effect can be enhanced.

In addition, it is effective to arrange a magnetic plate 2 on the outer peripheral surface of the filter tube l near the suspended solids discharge 1m + 11, which is especially effective when floating sludge or scum occurs in the filter tube l. Due to the effect of the above-mentioned magnetic plate 2 existing above the level of the suspension 9, namely the above-mentioned magnetic induction effect, cyclone effect and agglomeration effect, the suspension discharge port together with the magnetic suspension 7! 1 of these sludges, scum, etc. can be discharged together with the sludge and scum, thereby further improving the filtration effect.

Note that if the pitch interval of the screw blades 6 of the screw conveyor 4 is made small as described above, the transport speed of the suspended matter in this part will be correspondingly slowed, the compressibility of the suspended matter will increase, and the liquid removal performance of the suspended matter will be improved. further improves.

When the screw blades 6 of the screw conveyor 4 are provided in two stages as in the lower part of the screw conveyor 4 in FIG. Since the exposed area of the inner surface of the screw conveyor 4 becomes larger, the adsorption capacity of magnetic suspension can be increased, and the cyclone effect, flocculation effect, transfer effect, and liquid removal effect of the screw conveyor 4 described above can also be doubled. can.

As mentioned above, according to the magnetic filtration device of the present invention,
Not only magnetic suspended matter, but also non-magnetic suspended matter as well as magnetic suspended matter are mostly attracted to the inner surface of the filter tube by a strong magnetic field formed on the entire surface of the filter tube by a unique magnetic plate, and further filtered. The suspended matter adsorbed on the inner surface of the cylinder can be efficiently transferred and discharged using a special screw conveyor, and at the same time, a filtrate from which the suspended matter has been filtered out can also be easily obtained.

In addition, the magnetic filtration device of the present invention efficiently arranges a large number of magnetic plates on the outer circumferential surface of the filtration cylinder, and a screw conveyor with high work efficiency is installed in the filtration cylinder in a compact manner. It is possible to downsize the device and reduce the installation area, and since the device structure is simple, consisting of a filter tube and a screw conveyor, the equipment cost and operating cost of the device can be reduced. Another advantage is that it is easy to maintain and manage.

[Brief explanation of drawings]

1 and 2 show embodiments of the present invention. FIG. 1 is an explanatory longitudinal cross-sectional view of the magnetic filtration device of the present invention, and FIG. 2 is a cross-sectional view taken along the vertical line I to ■ in FIG. The illustration shows a state in which the polarities of the magnetic plates are arranged alternately and continuously as the same polarity, the same polarity, the opposite pole, the opposite pole, etc., and two of the same poles and two of the opposite poles are set. FIG. 7 is an explanatory longitudinal cross-sectional view showing a conventional device in which the same pole, the opposite electrode, the same pole, and the opposite electrode are alternately and continuously arranged. 1. Filter tube, 2. Magnet plate, 4. Screw conveyor, 5. Filtrate, 6. Screw blade,
7. Magnetic suspension, 8. Shaft, 9. Suspension liquid, 11. Suspension discharge port, 13. Suspension inlet port, 14. Filtrate discharge port, Patent applicant Inaba
Complete procedure amendment March 8, 1985

Claims (3)

[Claims] (1) A large number of magnetic plates are placed at intervals on the outer peripheral surface of a filter cylinder made of non-magnetic material, and the polarity of the magnetic plates is set to the same polarity, the same polarity, the opposite pole, the opposite pole, the same polarity, the same polarity, the opposite pole, Counter electrode..., two same electrodes and two counter electrodes are arranged alternately and continuously as a set, and a suspension discharge port is provided in the upper part of the filter cylinder, and a filtrate discharge port is provided in the lower part of the filter cylinder. , a suspension inlet is provided on the side of the filtration cylinder between the suspension discharge port and the filtrate discharge port, and the pitch interval of the screw blades made of non-magnetic material of the screw conveyor provided inside the filtration cylinder is A magnetic filtration device that is small in the direction of material transfer, has a screw conveyor shaft made of magnetic material, and has the tips of the screw blades placed close to the inner surface of the filtration cylinder. (2) The magnetic filtration device according to claim 1, wherein the screw conveyor has two screw blades. (3) The magnetic filtration device according to claims 1 and 2, wherein a magnetic plate is disposed on the outer peripheral surface of the filter cylinder near the suspended matter discharge port.