JP2012239989A - Magnetic separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic separator capable of surely removing captured iron powder with a simple structure.SOLUTION: A magnetic disc 32 caused to magnetically adsorb iron power mixed in a liquid to be processed is configured to include: two circular plates attached to a rotation axis 36 at a predetermined interval in between; a circular spacer member 54 arranged between the two circular plates and including an outer circumferential surface 54a having a radius of curvature smaller than the radius of curvature of the circular plate; a seal member 58 including an inner circumferential surface 58a having a fixed distance from the outer circumferential surface 54a of the circular spacer member 54 and configured to close a gap between the two circular plates water-tightly in the circumferential direction except a partial section; a plurality of permanent magnets 56 arranged annually in a space 66 formed between the outer circumferential surface 54a of the circular spacer member 54 and the inner circumferential surface 58a of the seal member 58 except a partial section in which the seal member 58 is not provided; and a packing member 60 arranged at the boundary between the space 66 and the partial section in which the seal member 58 is not provided and configured to close the space 66 water-tightly.

Description

The present invention relates to a magnetic separation device that collects a processing object in a liquid to be processed using magnetic force and separates and removes the object from the liquid to be processed.

2. Description of the Related Art Conventionally, as a method for separating and removing dust in forging oil, hydraulic oil, and lubricating oil from the oil, a filter system that captures dust by installing a filter in the oil flow path has been widely used. There are various types of filters, but in recent years, magnetic filters are often used focusing on the fact that most of the dust present in oil is stuck to metal powder such as iron powder. Since the magnetic filter captures iron powder and the like by magnetism, the eyes can be made rougher than a general filter. Therefore, if the magnetic filter is used, the pressure loss is reduced and the iron powder capturing ability is greatly improved. However, although the frequency is reduced, there is no difference from the conventional filter in that it is necessary to periodically perform cleaning and replacement.

When the filter is cleaned or replaced, the oil flow must be temporarily stopped. Therefore, the removal of iron powder by the filter method has a problem that the work efficiency is reduced due to the operation stop. In addition, if the time for cleaning or replacement is overdue, excessive pressure loss will occur and the oil flow balance will be greatly disrupted. In the worst case, the apparatus may fail or be damaged.

Therefore, for example, in Patent Document 1, a disk with permanent magnets arranged at appropriate intervals is rotated in oil, and the iron powder magnetically attracted to the disk is scraped off by a scraper provided in contact with the disk. A device to remove is shown. According to the apparatus disclosed in Patent Document 1, since the magnetically adsorbed iron powder is automatically removed, basically, work such as cleaning and replacement is unnecessary, and continuous use is possible. Is.

However, since the disk is provided with a plurality of permanent magnets uniformly in the direction of rotation of the disk, especially in the case of a permanent magnet having a large magnetic force, a magnetic attractive force acts between adjacent permanent magnets, It is considered that the iron powder scraped off by the scraper stays in that position without falling forever. Therefore, the magnetic force of the permanent magnet has to be suppressed at a certain level, and there is a problem that a sufficient removal capability cannot be expected.

An apparatus that improves this point is disclosed in Patent Document 2. This device is the same as the device shown in Patent Document 1 in that permanent magnets are arranged on a disk, but is characterized in that the permanent magnets are arranged in a curved shape. The iron powder that has been removed is fed to the outer periphery of the disk and removed.

Japanese Patent Laid-Open No. 10-244424 JP 2011-16104 A

However, the device of Patent Document 2 having a characteristic arrangement of permanent magnets can achieve the intended purpose under specific conditions, but is not always expected in the case where the design conditions greatly deviate. It is considered that the removal effect cannot be exhibited. In addition, the work of arranging the permanent magnets in a specific arrangement takes time and effort, and there is a problem that the manufacturing cost increases.

The present invention has been made to solve the problems existing in the prior art, and an object of the present invention is to provide a magnetic separation device capable of reliably removing iron powder captured with a simple structure. is there.

In order to achieve the above object, the present invention provides a processing tank for storing a liquid to be processed, a rotating shaft disposed in the processing tank, a portion attached to the rotating shaft, and a portion that does not act on a magnetic adsorption force. Is provided with a magnetic disk provided continuously in a ring shape and a scraper in contact with the annular portion of the magnetic disk.

The magnetic disk is provided with a portion that applies a magnetic attraction force and a portion that does not act on the magnetic disk continuously in an annular shape. The iron powder in the liquid to be treated, and further dust and the like adhering to the iron powder are adsorbed to the portion where the magnetic adsorption force is applied. The adsorbed iron powder or the like is scraped off by the scraper, but is released from the magnetic attraction force when the portion where the magnetic attraction force does not act is approached to the scraper, and is detached from the magnetic disk and removed.

The magnetic disk has two disks attached in parallel to the rotating shaft at a predetermined interval, and an outer peripheral surface disposed between the two disks and having a radius of curvature smaller than the radius of the disk. A spacer member, an inner peripheral surface that maintains a certain distance from the outer peripheral surface of the spacer member, a seal member that watertightly seals between the two discs except for some sections in the circumferential direction, and the spacer member A plurality of magnets arranged in an annular shape except for a partial section where the seal member is not provided in a space formed between an outer peripheral surface of the seal member and an inner peripheral surface of the seal member, and the plurality of magnets. And a packing member that is arranged at a boundary between the space and a partial section where the seal member is not provided, and seals the space where the plurality of magnets are arranged in a watertight manner.

Here, a portion where a plurality of magnets are arranged is a portion where a magnetic attractive force is applied, and a portion where no magnet is disposed between the packing member and the packing member is a portion where no magnetic attractive force is applied. Since the magnet can be easily exchanged by attaching and detaching the packing member, a magnet having a performance suitable for the purpose and purpose of iron powder removal can be appropriately selected and used. Although electromagnets can be used, permanent magnets such as alnico magnets, ferrite magnets, neodymium magnets, and samarium cobalt magnets are suitable in consideration of economy and maintenance.

In order to remove iron powder or the like separated from the liquid to be treated, a scraper box communicating with the outside of the treatment tank may be provided inside the treatment tank. The scraper box is a box-like body that is open at the top and bottom, and a scraper is attached to the top, and a valve that intermittently shields the internal space in the top-bottom direction is provided below the scraper box. Iron powder or the like scraped off from the magnetic disk by the scraper falls into the scraper box and is discharged to the outside of the processing tank by opening and closing the valve.

The magnetic separation device can continuously remove the iron powder or the like in the liquid to be processed without staying in the scraper by providing the magnetic disk with a portion that applies a magnetic attraction force and a portion that does not act on the magnetic disk. . Moreover, it is arranged at a predetermined position simply by inserting a permanent magnet into a space formed in the magnetic disk. Furthermore, by using a scraper box, the separated and removed iron powder and the like can be reliably discharged to the outside of the treatment tank.

Overall structure of magnetic separator Magnetic disk structure diagram 3-3 sectional view of FIG.

Embodiments of the present invention will be described with reference to the accompanying drawings. First, the structure of the magnetic separation device will be described with reference to FIG. The magnetic separation device 10 is configured by attaching a processing tank 14, a valve box 16, a control box 18, and a sludge tank 20 to a base 12. The processing tank 14 is a hollow sealed container for storing the liquid to be processed. The treatment tank 14 can be divided into two parts at the center flange 22. A lid 26 is attached to the uppermost flange 24.

The treatment tank 14 is provided with an inlet 28 and an outlet 30 for the liquid to be treated. From the inflow port 28, liquids to be treated such as used hydraulic oil and lubricating oil flow. The liquid to be treated that flows in from the inflow port 28 is subjected to separation and removal processing of iron powder and the like inside the processing tank 14 and flows out of the processing tank 14 from the outflow port 30.

A magnetic disk 32 and a scraper box 34 are provided inside the processing tank 14. The magnetic disk 32 is a device that captures dust such as iron powder, iron scrap, and dust adhering to the liquid to be treated by a magnetic adsorption force. The magnetic disk 32 is attached to the rotary shaft 36 attached to the flange 22 portion of the processing tank 14 so as to be centered, and the inside of the processing tank 14 is driven by a rotational driving force applied to the rotary shaft 36 from a motor (not shown). To make a gentle rotational movement. The control box 18 houses a control device 38 for controlling the rotational movement of the magnetic disk 32.

The scraper box 34 is a device that separates and removes iron powder or the like captured by the magnetic disk 32 from the magnetic disk 32 and discharges it to the outside of the processing tank 14. The scraper box 34 is a box-like device having both upper and lower ends opened, and includes a receiving part 34a and a discharging part 34b. The receiving portion 34a is a saucer-like member having an upper opening, and a scraper 40 that is in contact with the side surface of the magnetic disk 32 is attached inside. One scraper 40 is provided on each side of the magnetic disk 32, and iron powder or the like scraped off from the magnetic disk 32 by the scraper 40 is collected by the receiving portion 34a. The discharge portion 34b has an upper end continuous with the receiving portion 34a, a lower end penetrating the bottom wall of the processing tank 14 and exposed to the outside, and forms a passage that connects the receiving portion 34a and the outside of the processing tank 34b.

The discharge part 34b is provided with two valves 42 and 44. The valves 42 and 44 are arranged at intervals in the vertical direction and have a function of intermittently shielding the internal space of the scraper box 34. The valve box 16 is provided with an actuator (not shown) that opens and closes the valves 42 and 44, and the operation of the actuator is controlled by a control device 46 in the control box 18.

Next, the structure of the magnetic disk 32 will be described with reference to FIGS. The magnetic disk 32 is mainly composed of two stainless steel disks 52, an aluminum circular spacer member 54, and 15 circular permanent magnets 56, and a seal member 58 and two packing members. 60, and further, a fan-shaped spacer member 62 and a lid 64 are added.

The two discs 52 are attached to the rotating shaft 36 so that the center of the circle coincides with the axis of the rotating shaft 36. The two discs 52 are arranged in parallel with a space therebetween, and a space having a constant width is formed by adding a slight margin to the thickness of the permanent magnet 56. The circular spacer member 54 is a circular plate having a diameter smaller than that of the circular plate 52 and is attached between the two circular plates 52 so that the center of the circle coincides with the axis of the rotary shaft 36 in the same manner as the circular plate 52. It has been. The outer peripheral portions of the two discs 52 are welded to the seal member 58. The seal member 58 is provided only in the 5/6 section (section corresponding to the central angle of 300 degrees) on the outer periphery of the disc 52, and the remaining 1/6 section (corresponding to the central angle of 60 degrees). (Section) is not provided.

A space 66 having a height slightly larger than the length of the diameter of the permanent magnet 56 is formed between the outer peripheral surface 54 a of the circular spacer member 54 and the inner peripheral surface 58 a of the seal member 58. The space 66 has an annular shape lacking a partial section where the seal member 58 is not provided. Fifteen permanent magnets 56 are inserted into the space 66, and are arranged in an annular shape that also lacks some sections. Openings at both ends of the space 66 are closed with a packing member 60. The packing member 60 is disposed at two locations that are boundaries between the space 66 in which the permanent magnet 56 is disposed and a partial section in which the seal member 58 is not provided, and is inserted into the opening a of the space 66. The space 66 is closed watertight.

The fan-shaped spacer member 62 is a member for closing the space between the two packing members 60, and has both functions of maintaining the strength of the magnetic disk 32 and preventing the packing member 60 from falling off. The outside of the fan-shaped spacer member 62 is covered with a lid 64. The lid 64 has the same cross-sectional shape as the seal member 58, supplements a partial space where the seal member 58 is not provided, and forms an annular outer peripheral portion of the magnetic disk 32 together with the seal member 58. The lid 64 is fixed to the seal member 58 with two screws 68.

The space 66 in which the permanent magnets 56 are arranged is shut off from the outside by a seal member 58 and two packing members 60. When the iron powder directly adheres to the permanent magnet 56, the magnetic attractive force decreases, but the liquid to be treated cannot enter the space 66 that is shut off from the outside, so that iron powder or the like adheres to the permanent magnet 56. The magnetic attractive force is not maintained for a long time. Therefore, the magnetic separation apparatus 10 can maintain the removal capability of iron powder and the like over a long period of time.

The magnetic disk 32 has a region in which a section where the permanent magnet 56 is present and a section where the permanent magnet 56 is not present are annularly formed, each of which is a portion where the magnetic attractive force is applied and a portion where the magnetic attractive force is not applied. The area ratio of the portion where the magnetic attractive force is not applied to the portion where the magnetic attractive force is applied is 1: 5, and the portion where the magnetic attractive force is not applied is secured to the portion where the magnetic attractive force is applied. Iron powder or the like scraped off from the magnetic disk 32 by the scraper 40 tends to remain in the scraper 40 due to the magnetic adsorption force while the space 66 is close to the scraper 40, but there is a permanent magnet 56. Since the magnetic attraction force does not act while a part of the section that is not in close proximity to the scraper 40, it falls from above the scraper 40 by its own weight and is collected by the receiving part 34 a of the scraper box 34.

The iron powder or the like collected in the receiving part 34a is disposed through the following procedure. The iron powder or the like collected in the receiving part 34a falls to the discharge part 34b by opening the upper valve 42. Since the lower valve 44 is closed so that the liquid to be treated does not flow out, the iron powder or the like dropped on the discharge part 34 b is blocked by the valve 44. Before opening the valve 44, the upper valve 42 is closed so that the liquid to be processed in the processing tank 14 does not flow out. Thereafter, by opening the valve 44, iron powder or the like in the discharge portion 34b can be discharged to the outside of the processing tank 14. At this time, a small amount of the liquid to be treated that has been confined in the space between the upper valve 42 and the lower valve 44 is discharged together with the iron powder and the like.

The iron powder and the like and the liquid to be treated discharged to the outside of the treatment tank 14 fall freely as they are and are stored in the sludge tank 20 incorporated in the base 12. The sludge tank 20 is provided with a caster 70 and a handle 72 for transportation. Before the sludge tank 20 becomes full, the sludge tank 20 is pulled out from the base 12 and transported to a prescribed treatment site, and the mixture of iron powder and the liquid to be treated is disposed of.

DESCRIPTION OF SYMBOLS 10 Magnetic separator 14 Processing tank 32 Magnetic disk 34 Scraper box 40 Scraper 42, 44 Valve 52 Disc 54 Circular spacer member 54a Outer peripheral surface 56 Permanent magnet 58 Seal member 58a Inner peripheral surface 60 Packing member 66 Space

Claims (3)

A treatment tank for storing the liquid to be treated;
A rotating shaft arranged in the treatment tank;
A magnetic disk that is attached to the rotating shaft and includes a portion that applies a magnetic attraction force and a portion that does not act;
A scraper that contacts the annular portion of the magnetic disk;
A magnetic separation device comprising: The magnetic disk is
Two disks attached in parallel to the rotating shaft at a predetermined interval;
A spacer member provided between the two discs and having an outer peripheral surface having a radius of curvature smaller than the radius of the disc;
A seal member that includes an inner peripheral surface that maintains a constant distance from the outer peripheral surface of the spacer member, and that seals between the two disks in a water-tight manner except for some sections in the circumferential direction;
A plurality of magnets arranged in an annular shape except for a section where the seal member is not provided in a space formed between the outer peripheral surface of the spacer member and the inner peripheral surface of the seal member;
The packing member that is arranged at a boundary between a space in which the plurality of magnets are arranged and a partial section in which the seal member is not provided, and that tightly seals the space in which the plurality of magnets are arranged. 2. The magnetic separation device according to 1. The magnetic separation device according to claim 1, wherein the scraper is provided in a scraper box that communicates with the outside of the processing tank, and the scraper box is provided with a valve that intermittently shields an internal space.

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