JPWO2005049214A1 - Method and apparatus for removing magnetic foreign matter from liquid - Google Patents

Abstract

When the liquid is supplied into the cylinder from the lower side, the liquid stays in the cylinder, and the magnetic foreign matter is magnetically attached to the magnetic sphere. Just by supplying the cleaning liquid into the cylinder from the upper side, the magnetic foreign matter is discharged together with the cleaning liquid from the lower opening of the cylinder. The magnetic foreign matter in the cleaning liquid jumps from the cleaning liquid to the outer peripheral surface of the transfer side magnetic separator at the transfer position.

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for removing magnetic foreign matter from a liquid, and more particularly to a method and apparatus for removing magnetic foreign matter from a liquid that uses a magnetized magnetic material to remove magnetic foreign matter mixed in the liquid.

Conventionally, Patent Document 1 is known as a method for removing magnetic foreign substances from a liquid.
According to the removal method of Patent Document 1, first, a large number of magnetic spheres are filled into a cylindrical body having an excitation coil wound around an outer peripheral surface. Next, waste oil or the like of the metal processing machine is supplied into the cylinder from the upper opening, and then the magnetic sphere is magnetized by energizing the excitation coil. Thereby, magnetic foreign matters such as chips contained in the waste oil are adsorbed to the magnetic sphere.
If the supply of waste oil or the like is continued for a predetermined period, the amount of magnetic foreign matter adhering to the magnetic sphere becomes excessive, and the adsorption efficiency of the magnetic sphere to the magnetic foreign matter decreases. In this case, supply of oil or the like is temporarily stopped, air is supplied from the upper opening of the cylinder, and waste oil or the like in the cylinder is discharged from the lower opening.

Next, the energization of the exciting coil is turned off to demagnetize, and the cleaning liquid (organic agent) is supplied from the lower opening of the cylindrical body. At this time, the stirring rod previously inserted into the cylinder is vibrated. As a result, the magnetic foreign matter adhering to the magnetic body is discharged from the upper opening of the cylindrical body by the cleaning liquid while being wiped off by vibration.
Japanese Patent Laid-Open No. 5-212310

However, the method for removing magnetic foreign substances from the liquid of Patent Document 1 has the following problems.
(1) Waste oil or the like was supplied into the cylinder from the upper opening. Therefore, the residence time of waste oil or the like in the cylinder containing the magnetic sphere has become too short. As a result, the magnetic foreign matter mixed in the waste oil or the like was discharged through the opening on the lower side of the cylindrical body without being sufficiently magnetized on the magnetized magnetic sphere.
(2) Further, since waste oil or the like has been supplied into the cylinder from the upper opening, most of the magnetic foreign matter is magnetically attached to the magnetic spheres present in the upper part of the cylinder. Therefore, at the time of cleaning in which the magnetic sphere is demagnetized, a large amount of magnetic foreign matter attached to the magnetic sphere on the upper part of the cylinder is dropped by its own weight by the cleaning liquid supplied from the lower opening. As a result, the magnetic foreign matter was dispersed throughout the cylinder, and the cleaning efficiency was reduced.

(3) Further, conventionally, the cleaning liquid after use has been collected by adsorbing only the magnetic foreign matter from the cleaning liquid by a drum type magnetic separator. Specifically, as the magnetic separator, the one in which the lower part of the cylindrical drum is disposed below the liquid level of the used washing liquid storage tank is used. After adsorbing the magnetic foreign matter on the outer peripheral surface, the magnetic foreign matter was scraped off from the outer peripheral surface of the cylindrical drum by a scraper.
However, since the lower part of the cylindrical drum is immersed in the used cleaning liquid, a large amount of the cleaning liquid is scraped off by the scraper together with the magnetic foreign matter. As a result, the amount of cleaning liquid recovered was reduced and the amount of waste was increased.

Therefore, the present invention can increase the residence time of the liquid in the cylinder, thereby increasing the removal efficiency of the magnetic foreign matter mixed in the liquid, and increasing the cleaning efficiency of the magnetic body. Moreover, it is an object of the present invention to provide a method and an apparatus for removing magnetic foreign substances from a liquid that can simultaneously increase the amount of cleaning liquid recovered and reduce the amount of waste.
Another object of the present invention is to provide a method and an apparatus for removing magnetic foreign substances from a liquid that can shorten the discharge time of the liquid from the cylinder and the cleaning liquid after the cleaning. Furthermore, an object of the present invention is to provide a method and apparatus for removing magnetic foreign matter from a liquid that can effectively remove magnetic foreign matter attached to a magnetic material.

  According to the first aspect of the present invention, the upper opening is formed at the upper end, the lower opening is formed at the lower end, and the excitation is provided on the outer periphery of the cylinder containing a large number of magnetic bodies. Energizing the coil to excite the magnetic body, and simultaneously with or after the excitation, a liquid in which magnetic foreign matter is mixed into the cylinder is supplied from the lower opening, and the excited magnetic body is supplied to the magnet body. A magnetizing process for magnetizing magnetic foreign matter, a liquid discharging process for stopping the supply of the liquid after the magnetizing, and discharging the liquid in the cylindrical body from a lower opening, and a magnet for demagnetizing the magnetic material after draining Then, the cleaning liquid is supplied into the cylinder from the upper opening to wash away magnetic foreign substances adhering to the magnetic body, and the cleaning liquid after cleaning is discharged from the lower opening, and the cleaning liquid after cleaning, Magnetic foreign matter contained in the cleaning liquid is attracted to the outer peripheral surface of the transfer member by magnetic force. When the magnetic foreign matter reaches the transfer position approaching the outer peripheral surface of the transfer member, the magnetic foreign matter is transferred due to the magnetic gradient between the transfer member and the transfer member. And a detaching step in which the magnetic foreign material is transferred to the disengagement position by the displacing member, and the magnetic foreign material is separated from the outer peripheral surface of the displacing member. This is a method for removing magnetic foreign substances from a provided liquid.

According to the first aspect of the present invention, each magnetic body in the cylinder is excited by the exciting coil, and this state is maintained, and the liquid in which the magnetic foreign matter is mixed into the cylinder is supplied from the lower opening. . Thereby, compared with the case where the liquid is supplied from the conventional upper opening, the residence time of the liquid in the cylinder becomes longer. As a result, the amount of magnetic foreign matter in the liquid that is magnetically attached to each magnetic body also increases, and the removal efficiency of the magnetic body increases.
At the time of cleaning, supply of the liquid is stopped, and the liquid in the cylinder is discharged from the lower opening. Thereafter, the energization of the exciting coil is stopped to demagnetize the magnetic body. In this state, the cleaning liquid is supplied into the cylinder from the upper opening, and the magnetic foreign matter adhering to the magnetic body is washed away from the lower opening.

  Thus, since the liquid is supplied from the lower opening, as described above, the liquid stays in the cylinder for a longer time than in the prior art. This eliminates the possibility that the magnetic foreign matter is biased and attracted to the magnetic body present at the upper part of the cylinder. Therefore, the magnetic foreign matter can be magnetized almost uniformly on all the magnetic bodies in the cylinder. Thus, the treated magnetic foreign matter is efficiently discharged from the lower opening together with the cleaning liquid simply by supplying the cleaning liquid from the upper opening into the cylinder. At this time, the dead weight of the magnetic foreign matter contributes to the discharge of the magnetic foreign matter, contrary to the conventional case. From the above, the cleaning efficiency of the magnetic material can be increased.

  Further, after cleaning, magnetic foreign substances contained in the used cleaning liquid are adsorbed on the outer peripheral surface of the transfer member by magnetic force. Thereafter, the magnetic foreign matter reaches the jump position by the transfer member, and here, the magnetic foreign matter jumps from the cleaning liquid after cleaning to the outer peripheral surface of the jump member due to the magnetic gradient between the transfer member and the jump member. Move and be adsorbed. That is, the cleaning liquid remains on the outer peripheral surface of the transfer member, and only the magnetic foreign matter with a small amount of the cleaning liquid adheres to the outer peripheral surface of the transfer member. As a result, the cleaning liquid is later recovered from the transfer member, so that the recovery amount is increased as compared with the conventional case. In addition, in the separation step, the magnetic foreign matter to which a large amount of the cleaning liquid adheres is not discarded as in the prior art, but the magnetic foreign matter with a small amount of the cleaning liquid attached is discarded, so that the waste disposal amount can be reduced. In this way, it is possible to simultaneously increase the amount of cleaning liquid recovered and reduce the amount of waste.

The material and size of the cylinder are not limited. However, since the exciting material is provided on the outer periphery of the cylindrical material, a nonmagnetic material such as stainless steel or aluminum is preferable.
The shape of the cylinder is not limited as long as openings are formed at the upper end and the lower end of the cylinder, respectively. For example, a circle, an ellipse, a polygon more than a triangle, etc. are mentioned by planar view.
For example, iron, nickel, cobalt, and alloys thereof can be used as the magnetic material.
Moreover, the shape of a magnetic body is not limited. For example, a spherical shape, a polyhedron of tetrahedron or more and the like can be mentioned. When the magnetic body is spherical, the diameter is not limited. Although it varies depending on the type of liquid to be processed, it is, for example, 3.2 to 32 mm. Even if the magnetic body is densely packed in the cylinder, it may be stored roughly so that a certain gap is generated. The region in the cylinder in which the magnetic material is stored is a region that forms a magnetic circuit.
As the liquid to be treated, for example, water, water emulsified oil (rolled oil), water containing sodium hydroxide, oil (including waste oil from a metal processing machine), or the like can be used. The treated liquid can be discharged from the cylinder, for example, from the upper opening. In addition, a discharge pipe may be provided at an upper part or an intermediate part of the cylindrical body and discharged from here. Furthermore, the supply of the liquid into the cylinder may be temporarily stopped and discharged from the lower opening as in a batch type.

Examples of the magnetic foreign matter mixed in the liquid include chips discharged from a metal processing machine. Examples of the material include the same materials as the magnetic material.
Examples of the cleaning liquid include petroleum-based cleaning oils such as second petroleums and third petroleums, organic solvents such as alcohol, alkaline solutions, or a mixture of at least one of these and hot water. For example, when the magnetic material is washed with an organic solvent cleaning solution, the organic solvent dissolves the oil adhering to the magnetic material, and the removal rate of the magnetic foreign matter adhering to the magnetic material is increased.
The cleaning liquid may be blown into the cylinder together with the compressed air. As a result, the cleaning liquid uniformly penetrates into the gaps between the large number of magnetic bodies housed in the cylinder, and the cleaning effect of the magnetic body is further enhanced. The pressure of compressed air is preferably 0.5 kg / cm ² or more.
The cleaned cleaning liquid may be reused by extracting the liquid after separating the mixed magnetic foreign matters.

The transfer of the magnetic foreign matter by the transfer member and the transfer member may be achieved by rotating the transfer member and the transfer member, moving linearly, or moving in a curve.
The means for adsorbing the magnetic foreign matter by magnetic force on the outer peripheral surface of the transfer member and the outer peripheral surface of the transfer member is not limited. For example, it is possible to employ roller type magnetic force sorting means and drum type magnetic force sorting means. In addition, various magnet conveyors can be employed.
The roller-type magnetic force sorting means includes a rotating drum that rotates about a rotating shaft, and a fixed magnetic plate that is housed in the rotating drum and has a substantially C-shaped cross section perpendicular to the axis of the rotating drum. is there. The transfer member in the drum type magnetic separation unit is a rotating drum.
As a magnet used for magnetic selection, a permanent magnet can be adopted. The magnetic flux density of the N pole surface and the S pole surface of the magnet is, for example, 1000 G (0.1 Tesla) or more.

  According to a second aspect of the present invention, the discharge of the liquid in the cylinder in the draining step and the discharge of the cleaning liquid after cleaning in the cleaning step are performed by compressed air supplied into the cylinder. The method for removing a magnetic foreign substance from the liquid described in 1.

According to the second aspect of the present invention, the discharge of the liquid in the draining process and the discharge of the cleaning liquid after the cleaning in the cleaning process are forcibly performed by supplying compressed air to the cylinder (air blow). Do. Thereby, the discharge time of the liquid from the cylinder and the cleaning liquid after cleaning can be shortened.
Supply of compressed air is 0.3 kg / cm ² or more, preferably 0.5~3.0kg / cm ^2. If it is less than 0.3 kg / cm ² , the discharge time of the liquid from the cylinder and the discharge time of the cleaning liquid after cleaning become long.

  According to a third aspect of the present invention, in the cleaning step, the magnetic foreign matter magnetically attached to each magnetic body is cleaned while vibrating the cylindrical body, and the magnetic foreign matter is removed from the liquid according to claim 1 or 2. Is the method.

According to the third aspect of the present invention, in the cleaning process, the magnetic body is cleaned while vibrating with the vibration of the cylinder. Thereby, the magnetic foreign material adhering to a magnetic body can be removed effectively.
The method for vibrating the cylinder is not limited. For example, you may attach a vibrator to a cylinder. In addition, a method called ultrasonic vibration can also be employed.

  According to a fourth aspect of the present invention, there is provided a cylindrical body having an upper opening formed at the upper end and a lower opening formed at the lower end, a number of magnetic bodies housed in the cylindrical body, An excitation coil provided on an outer periphery of the cylinder and energizing the magnetic body in the cylinder; a liquid supply means for supplying liquid into which the magnetic foreign matter is mixed into the cylinder from the lower opening; and the excitation A processing liquid discharge means for discharging the processed liquid from which magnetic foreign substances are magnetically attached to and removed from the magnetic body by excitation by the coil, and a liquid for discharging the liquid in the cylindrical body from the lower opening. The magnetic foreign matter contained in the cleaning liquid after the cleaning is removed from the discharge means, the cleaning liquid supply means for supplying the cleaning liquid into the cylinder from the upper opening, and the magnetic sorting position where the cleaning liquid after the cleaning is supplied. By adsorbing to the outer peripheral surface, A transfer member capable of transferring the magnetic foreign matter from the magnetic force sorting position to the jump position, and when the magnetic foreign matter reaches the jump position by the transfer member, the magnetic foreign matter is transferred by the magnetic gradient between the transfer member and the transfer member. A jumping member that jumps from the outer peripheral surface to the outer peripheral surface and is attracted, and the jumping member jumps the magnetic foreign matter adsorbed on the outer peripheral surface and transports it from the suction position to another separation position. Thus, it is a device for removing magnetic foreign substances from the liquid that can be detached from the outer peripheral surface.

According to the fourth aspect of the present invention, each magnetic body in the cylindrical body is excited by the exciting coil, and in this state, the liquid is supplied from the lower opening to the cylindrical body. Thereby, the residence time of the liquid in a cylinder becomes long, and the removal efficiency of the magnetic foreign material in a liquid increases. The treated liquid from which the magnetic foreign matter has been magnetically attached to the magnetic material and removed is discharged by the processing liquid discharge means.
During cleaning, the supply of liquid is stopped and the magnetic material is demagnetized. The liquid in the cylinder is discharged from the lower opening by the liquid discharge means before demagnetization (during excitation). Next, the cleaning liquid is supplied into the cylinder from the upper opening, and the magnetic foreign matter adhering to the magnetic body is washed away. The used (after cleaning) cleaning liquid is discharged from the lower opening to the outside of the cylinder.

  In this way, the liquid is supplied from the lower opening, and thus stays in the cylinder for a longer time than in the conventional case. For this reason, it is possible to adhere the magnetic foreign matter substantially uniformly to all the magnetic bodies in the cylinder. Thus, after demagnetizing the magnetic material, the cleaning magnetic liquid is efficiently discharged together with the cleaning liquid from the lower opening only by supplying the cleaning liquid from the upper opening into the cylinder. As a result, the cleaning efficiency of the magnetic material can be increased.

  Further, at the magnetic force selection position, the magnetic foreign matter contained in the cleaning liquid after cleaning is attracted to the outer peripheral surface of the transfer member by the magnetic force. Thereafter, the magnetic foreign matter is transferred from the magnetic sorting position to the jump position by the transfer member. Therefore, due to the magnetic gradient between the transfer member and the transfer member, the magnetic foreign matter jumps out of the cleaning liquid adhering to the outer peripheral surface of the transfer member and is adsorbed on the outer peripheral surface of the transfer member. That is, the cleaning liquid remains on the outer peripheral surface of the transfer member, and only the magnetic foreign matter with a small amount of the cleaning liquid adheres to the outer peripheral surface of the transfer member. As a result, the cleaning liquid is later recovered from the transfer member, so that the recovery amount is increased as compared with the conventional case. In addition, in the separation step, the magnetic foreign matter to which a large amount of the cleaning liquid adheres is not discarded as in the prior art, but the magnetic foreign matter with a small amount of the cleaning liquid attached is discarded, so that the waste disposal amount can be reduced. In this way, it is possible to simultaneously increase the recovery amount of the cleaning liquid and reduce the waste amount (waste amount).

As the liquid supply means, for example, various pumps such as a vortex pump, a diffuser pump, a volute pump, a reciprocating pump, and a vane pump can be employed.
As the processing liquid discharge means, for example, a processed liquid discharge pipe communicated with the upper end portion of the cylinder can be employed.
As the liquid discharge means, for example, a liquid discharge pipe communicated with the lower end of the cylindrical body can be employed.
As the cleaning liquid supply means, a pump of the same type as the liquid supply means can be employed.

  According to a fifth aspect of the present invention, the discharge of the liquid in the cylinder and the discharge of the cleaning liquid after cleaning from the cylinder are performed by compressed air supplied from the compressed air generating means to the cylinder. 4. A device for removing magnetic foreign matter from a liquid according to item 4.

According to the fifth aspect of the invention, the discharge of the liquid from the cylinder and the discharge of the cleaning liquid after the cleaning from the cylinder are performed by supplying the compressed air generated by the compressed air generating means to the cylinder. Force each. Thereby, the discharge time of the liquid from the cylinder and the cleaning liquid after cleaning can be shortened.
As the compressed air generating means, for example, a compressor can be employed.

  The invention according to claim 6 is the apparatus for removing magnetic foreign matter from the liquid according to claim 4 or 5, wherein the cylinder is provided with a vibrating means for vibrating the cylinder during cleaning of each magnetic substance. It is.

According to the sixth aspect of the present invention, at the time of cleaning each magnetic body, the magnetic body is cleaned while vibrating with the vibration of the cylindrical body. Thereby, the magnetic foreign material adhering to a magnetic body can be removed effectively.
As the vibration means, for example, a vibrator or an ultrasonic generator can be employed.

  The invention according to claim 7 is characterized in that the transfer member and the jump member are a non-magnetic cylindrical drum on which a magnetic foreign object is placed on the outer peripheral surface, and a rotating means for rotating the cylindrical drum in the circumferential direction; A permanent magnet having a circumferential position fixed to the cylindrical drum is fixed to a portion of the internal space of the cylindrical drum facing the magnetic force sorting position. The apparatus for removing magnetic foreign matter from a liquid according to any one of claims 4 to 6, wherein the acting magnetic force is larger than the magnetic force acting on the outer peripheral surface of the cylindrical drum of the transfer member.

  According to the seventh aspect of the present invention, at the magnetic force selection position, the magnetic foreign matter contained in the cleaning liquid after cleaning is attracted to the outer peripheral surface of the cylindrical drum of the transfer member by the magnetic force. Thereafter, the magnetic foreign matter is transferred from the magnetic sorting position to the jump position by the cylindrical drum of the transfer member. Therefore, due to the magnetic gradient between the transfer member and the flying member, the magnetic foreign matter jumps from the cleaning liquid adhering to the outer peripheral surface of the cylindrical drum of the transfer member to the outer peripheral surface of the cylindrical drum of the transfer member and is attracted. The

The material of the cylindrical drum is not limited as long as it is a non-magnetic material. For example, austenitic stainless steel can be employed.
The rotational speed of the cylindrical drum varies depending on the magnitude of the magnetic force applied to the object to be sorted on the outer peripheral surface of the cylindrical drum. For example, when the adjustment range of magnetic force is 3000 to 5000 G, the drum rotation speed is 100 m / min at the maximum. When it exceeds 100 m / min, in the case of austenitic stainless steel, there is a possibility that heat generation due to eddy current loss and increase in electric capacity of the motor due to eddy current resistance loss may occur.
A scraper that scrapes off the magnetic material after magnetic separation may be brought into contact with the outer peripheral surface of the cylindrical drum downstream from the magnetic separation position.

As a material of the permanent magnet, for example, a rare earth metal such as neodymium or samarium can be employed.
The magnetic flux density between the N pole surface and the S pole surface of the permanent magnet is, for example, 1000 (0.1 Tesla) to 5000 G (0.5 Tesla). If it is less than 1000 G, the adsorptive power is insufficient.
The permanent magnet should just be arrange | positioned in the opposing part with the magnetic force selection position among the internal space of a cylindrical drum at least. For example, permanent magnets may be arranged in the entire range from the dropping position of the sorting object to the magnetic sorting position (or slightly downstream) in the transfer path of the sorting object on the outer peripheral surface of the cylindrical drum.

According to the method for removing magnetic foreign matter from the liquid according to claim 1 and the apparatus for removing magnetic foreign matter from the liquid according to claim 4, since the liquid is supplied into the cylindrical body from the lower opening, In comparison, the liquid stays in the cylinder for a long time. As a result, the amount of magnetic foreign matter in the liquid that is magnetically attached to each magnetic material also increases, and the removal efficiency of the magnetic material increases. In addition, the possibility that the magnetic foreign matter is biased and adsorbed to the magnetic body in the upper part of the cylindrical body when the liquid is supplied can be eliminated, and the magnetic foreign substance can be adhered to all the magnetic bodies in the cylindrical body substantially uniformly. Therefore, the magnetic foreign matter washed off from the magnetic body can be efficiently discharged together with the cleaning liquid from the lower opening only by supplying the cleaning liquid from the upper opening to the cylinder during cleaning. As a result, the cleaning efficiency of the magnetic material can be increased.
Further, the magnetic foreign matter contained in the cleaning liquid after cleaning is attracted to the outer peripheral surface of the transfer member by magnetic force, and then reaches the jump position by the transfer member, and jumps from the cleaning liquid to the outer peripheral surface of the transfer member. Adsorbed. As a result, it is possible to simultaneously increase the recovery amount of the cleaning liquid and reduce the waste amount.

  In particular, according to the invention described in claim 2 and claim 5, the discharge of the liquid from the cylinder and the discharge of the cleaning liquid after the cleaning from the cylinder are respectively performed by the compressed air generated by the compressed air generating means. Force it. Thereby, the discharge time of the liquid from the cylinder and the discharge time of the cleaning liquid after cleaning can be shortened.

  According to the third and sixth aspects of the invention, when cleaning each magnetic body, the magnetic body is cleaned while vibrating along with the vibration of the cylinder. Thereby, the magnetic foreign material adhering to a magnetic body can be removed effectively.

FIG. 1 is a schematic configuration diagram of an apparatus for removing magnetic foreign matter from a liquid according to Embodiment 1 of the present invention.
FIG. 2 is a partial cross-sectional view around a cylinder of the apparatus for removing magnetic foreign matter from liquid according to Embodiment 1 of the present invention.
FIG. 3 is an enlarged side view including a partial cross-sectional view of a transfer member and a jump member according to Embodiment 1 of the present invention.
FIG. 4 is an enlarged cross-sectional view of a transfer member according to Embodiment 1 of the present invention.
FIG. 5 is an enlarged longitudinal sectional view of a transfer member according to Embodiment 1 of the present invention.
[FIG. 6] It is explanatory drawing showing the magnetic flux density between the transfer member based on Example 1 of this invention, and a jumping member.

Explanation of symbols

10 A device for removing magnetic foreign matter from a liquid,
11 cylinder,
12 Magnetic sphere (magnetic body),
13 Excitation coil,
14 slurry pump (liquid supply means),
16 Supply pump (cleaning liquid supply means),
17 Vibrator (vibration means),
27 Waste oil discharge pipe (liquid discharge means),
41 Transfer side magnetic separator (transfer member),
42 Transfer side magnetic separator (transfer member),
45 first cylindrical drum,
48 second cylindrical drum,
50 motor (rotating means),
52 permanent magnets,
A Compressed air generator (compressed air generating means).

  Embodiments of the present invention will be described below with reference to the drawings.

  1 and 2, reference numeral 10 denotes a device for removing magnetic foreign matter from a liquid (hereinafter referred to as a removing device) according to Embodiment 1 of the present invention. This removing device 10 has an upper opening formed at the upper end and a lower end. A cylindrical body 11 made of stainless steel with a lower opening formed therein, a number of steel magnetic spheres 12 (magnetic bodies) housed in the cylindrical body 11, and the outer periphery of the cylindrical body 11 And an exciting coil 13 for exciting the magnetic sphere 12 in the cylinder 11 and slurry for supplying waste oil (liquid) mixed with chips (magnetic foreign matter) from the lower opening in the cylinder 11. A pump (liquid supply means) 14, a treated oil discharge pipe 35 that discharges processed oil from the inside of the cylinder 11, and a waste oil discharge pipe (liquid discharge means) 27 that discharges waste oil containing chips in the cylinder 11. And supplying the cleaning liquid into the cylinder 11 from the upper opening. Supply pump (cleaning liquid supply means) 16, a compressed air generator (compressed air generation means) A for supplying compressed air into the cylinder 11, and a vibrator (vibration means) for vibrating the cylinder 11 when cleaning the magnetic sphere 12. 17) At the magnetic force selection position to which the cleaning liquid after cleaning is supplied, magnetic foreign substances contained in the cleaning liquid after cleaning are attracted to the outer peripheral surface by magnetic force, and the adsorbed magnetic foreign substances are removed from the magnetic force selection position. When a magnetic foreign substance reaches the jump position by the transfer-side magnetic separator 41 (transfer member) 41 that can be transferred to the jump position, the magnetic gradient between the transfer-side magnetic separator 41 and this magnetic There is provided a jumping side magnetic separator (a jumping member) 42 in which foreign matter jumps from the outer peripheral surface of the transfer side magnetic separator 41 to the outer peripheral surface and is attracted.

Hereinafter, each component will be described in detail.
The cylindrical body 11 has a lower end portion that gradually tapers downward. A wire mesh 18 for preventing the magnetic sphere 12 from falling is housed in a stretched state at the lower end of the cylinder 11. The exciting coil 13 is arranged on the outer periphery of the cylinder 11 at a predetermined pitch in the length direction of the cylinder 11 (however, it may be one or tens of stages). A direct current is supplied to the exciting coil 13 to magnetize the magnetic sphere 12 in the cylinder 11. A cooling fan 19 is provided on the side of the excitation coil 13 to cool the generated excitation coil 13. A plurality of injection nozzles 20 for injecting the cleaning liquid into the cylinder 11 at 10 kg / cm ² are disposed in the peripheral wall of the cylinder 11 between the excitation coils 13. However, each injection nozzle 20 may be omitted.
The vibrator 17 is attached to the lower end portion of the cylinder 11 and vibrates the entire cylinder 11. Instead of the vibrator 17, a magnetic rod connected to a vibration generator may be inserted into the cylindrical body 11 to directly vibrate the magnetic sphere 12.

The diameter of the magnetic sphere 12 is 12.7 mm. The magnetic sphere 12 is closely packed in the cylinder 11. In the cylindrical body 11, the region filled with the magnetic sphere 12 is a portion that constitutes a magnetic circuit with the exciting coil 13 wound around the outer periphery.
A waste oil pipe 23 that supplies waste oil in the waste oil storage tank 22 into the cylinder 11 is communicated with the lower end portion of the cylinder 11 via the first valve 21 and the slurry pump 14. In the middle of the waste oil pipe 23, a cleaning liquid discharge pipe 25 that discharges the cleaning liquid that has cleaned the inside of the cylinder 11 and the waste oil discharge pipe 27 that discharges the waste oil remaining in the cylinder 11 are communicated with each other.
The cleaning liquid discharge pipe 25 is provided with a second valve 24, and the waste oil discharge pipe 27 is provided with a third valve 26. The downstream end of the cleaning liquid discharge pipe 25 is disposed on the liquid surface of a cleaning liquid storage tank 59 provided directly below the transfer side magnetic separator 41.

  Generated at the upper end of the cylindrical body 11 by the cleaning liquid supply pipe 30 for supplying the cleaning liquid in the cleaning liquid storage tank 59 into the cylindrical body 11 and the compressed air generator A via the fourth valve 28 and the supply pump 16. Compressed air supply pipe 33 for supplying the compressed air into the cylinder 11 via the fifth valve 31 and the check valve 32, and the treated oil from which chips are removed in the cylinder 11 A treated oil discharge pipe 35 that discharges to the outside through the valve 34 is communicated. The upstream end of the cleaning liquid supply pipe 30 is disposed below the liquid surface of the cleaning liquid storage tank 59.

Next, with reference to FIGS. 3-6, the structure of the transfer side magnetic separator 41 and the jump side magnetic separator 42 is demonstrated in detail. First, the transfer side magnetic separator 41 will be described.
As shown in FIG. 3, the transfer-side magnetic separator 41 has a substantially three-quarter round inside the first cylindrical drum 45 that is driven to rotate about a central fixed shaft 41 a by a driving source (not shown) (see FIG. In FIG. 3, a plurality of first magnets 44 are fixedly arranged via a magnet mounting board 43.
The transfer-side magnetic separator 42 has a second cylindrical drum disposed with a gap 46 between the first cylindrical drum 45 and an axis parallel to the first cylindrical drum 45 via a fixed shaft 47. 48 and a motor 50 that is an example of a drive source that drives the second cylindrical drum 48 via a drive belt 49. As shown in FIGS. 3 to 5, the second cylindrical drum 48 is rotationally driven in the opposite direction to the first cylindrical drum 45. Inside the second cylindrical drum 48, two second magnets 52 are arranged in a fixed state via a magnet mounting board 51, respectively. Each second magnet 52 removes chips (magnetized material) moving in a state of being attracted to the first cylindrical drum 45 by the magnetic force of the first magnet 44 near the end of the first magnet 44 group. Adsorb at. This end position is above the first cylindrical drum 45.

Hereinafter, the transfer side magnetic separator 42 will be described in detail.
The fixed shaft 47 is supported on both sides by a fixed bearing (not shown), and is provided so that the mounting angle of the second magnet 52 can be adjusted. The second magnet 52 is fixed such that a plurality of unit magnets are arranged and fixed on the magnet mounting plate 51 in the axial direction (FIGS. 4 and 5), and magnets adjacent in the circumferential direction alternate with N and S poles. It is arranged in an arc shape. The material of the magnet is arbitrary, but in the present embodiment, a rare earth magnet neodymium magnet is used. The structure of the first cylindrical drum 45 is also arbitrary. However, the unit magnets adjacent to each other in the axial direction constituting the first magnets 44 are arranged so as to alternate with N poles, S poles, N poles. Further, a shooter 58 for supplying the used cleaning liquid to the outer peripheral surface of the first cylindrical drum 45 is provided outside the starting end position of the first magnet 44 group (FIG. 3). Further, on the outer peripheral surface of the first cylindrical drum 45, a plurality of ridge scraping members 60 parallel to the drum axis are arranged at equal intervals in the circumferential direction. Each scraping member 60 is made of stainless steel, and is fixed to the first cylindrical drum 45 by welding or the like. Similarly, a scraping member 60 is welded to the outer peripheral surface of the second cylindrical drum 48.

  The second cylindrical drum 48 is made of stainless steel such as SUS304, and a hole through which the fixed shaft 47 is passed is formed in the center of the side plates 53 and 54. The second cylindrical drum 48 is attached to the fixed shaft 47 via dust-proof bearings 53a and 54a. The V pulley 57 has the same axial center as the second cylindrical drum 48 and is attached to the side plate 53 via a pipe 53b. The V pulley 57 is connected to a pulley fixed to the output shaft of the motor 50 by a drive belt 49. The rotational force of the motor 50 is transmitted to the second cylindrical drum 48 via the drive belt 49. As another power transmission means, for example, a combination of a sprocket and a chain can be employed.

Of the outer peripheral surface of the second cylindrical drum 48, the tip of the scraper 70 is pressed against the end near the side opposite to the gap 46. Thereby, the chips adhering to the outer peripheral surface of the second cylindrical drum 48 can be peeled off by the scraper 70.
Further, as a driving method of the first cylindrical drum 45, although not shown, for example, a combination of a motor, a driving belt, and a V pulley can be adopted as in the case of the second cylindrical drum 48. The first and second cylindrical drums 45 and 18 may be adjusted by using a V pulley and the same motor may be used as a drive source.
As shown in FIG. 5, a spare magnet mounting board 61 is disposed inside the second cylindrical drum 48. Thereby, the magnet 52 can be added to the magnet mounting board 61 to adjust the mounting angle.

Next, as shown in FIGS. 1 and 2, a method for removing chips from waste oil that employs a removing device 10 will be described.
First, the cooling fan 19 is operated, and the magnetic sphere 12 in the cylinder 11 is excited by the exciting coil 13 in this state. Therefore, the exciting coil 13 becomes an electromagnet.
Next, the first valve 21 and the sixth valve 34 are opened. Thereby, the waste oil (including chips) in the waste oil storage tank 22 led out by the slurry pump 14 is gradually supplied into the cylinder 11 from below through the waste oil pipe 23. As a result, the waste oil continuously moves upward in the cylinder 11. In the middle of this, chips contained in the waste oil are magnetically attached to the many magnetized magnetic spheres 12. The treated oil from which chips are removed in this manner is discharged from the upper end portion of the cylinder 11 through the treated oil discharge pipe 35 to the outside.

When the operation is continued for a certain period, a large amount of chips and the like are magnetically attached to each magnetic sphere 12. In this case, the first valve 21 and the sixth valve 34 are closed to stop the supply of waste oil. Thereafter, the third valve 26 and the fifth valve 31 are opened, and the compressed air generated by the compressed air generator A is supplied into the cylinder 11 from above through the compressed air supply pipe 33 (air blow). As a result, the waste oil remaining in the cylinder 11 is discharged from the lower part of the cylinder 11 to the outside through the waste oil discharge pipe 27. It is also possible to increase the amount of residual waste oil discharged from the waste oil pipe 27 by opening the valve 28a before the air blow and supplying hot water into the cylinder 11 from the upper part of the cylinder 11.
After the predetermined time has elapsed, the third valve 26 and the fifth valve 31 are closed, and the compressed air supply from the compressed air generator A is stopped. Here, it is also possible to use the residual liquid as treated oil. However, since the residual liquid tends to contain a large amount of iron or the like, in order to prevent the contamination of magnetic foreign matters as much as possible in a special case, this residual liquid should not be used as used oil and returned to the waste oil storage tank 22. It is preferable to perform magnetic separation again.

Thereafter, a current of a predetermined magnitude is instantaneously supplied to the exciting coil 13 to perform reverse excitation and demagnetize. Next, vibration is applied to the cylinder 11 by the vibrator 17, and the magnetic sphere 12 is stirred in the cylinder 11. In addition, the second valve 24 and the fourth valve 28 are opened, the supply pump 16 is operated, and the cleaning liquid is supplied from the cleaning liquid storage tank 59 through the cleaning liquid supply pipe 30 into the cylindrical body 11. At this time, a plurality of injection pumps (not shown) may be operated to inject a part of the cleaning liquid into the cylinder 11 from the plurality of injection nozzles 20 disposed on the peripheral wall of the cylinder 11. At that time, the compressed air generator A is operated, and the cleaning liquid is sprayed together with compressed air of 1 kg / cm ² or more through a pipe (not shown). The cleaning liquid sprayed from the spray nozzle 20 penetrates evenly between the magnetic spheres 12 and dissolves and desorbs oil components including chips adhering to the magnetic spheres 12 with the action of ultrasonic waves.

The cleaning liquid that has flowed into the cylinder 11 from above pushes the chips and oil in the cylinder 11 out of the bottom of the cylinder 11. The pushed used cleaning liquid is supplied to the shooter 58 of the transfer side magnetic separator 41 through the cleaning liquid discharge pipe 25.
On the other hand, the magnetic spheres 12 are agitated by the vibration of the cylindrical body 11 by the vibrator 17, and a large number of magnetic spheres 12 rotate and collide with each other to come into contact with each other. As a result, the cleaning liquid sprayed from the spray nozzle 20 can be received over the entire surface of the magnetic sphere 12. Therefore, the oil and chips adhering to the magnetic sphere 12 are completely removed. Thereafter, the chips in the cylindrical body 11 are almost completely removed by elapse of a predetermined time.

Next, operations of the transfer side magnetic separator 41 and the jump side magnetic separator 42 will be described with reference to FIGS.
First, the first cylindrical drum 45 is rotated by a driving source (not shown). The rotational speed of the first cylindrical drum 45 is arbitrary, but here it is about 5 m / min. The rotational speed of the second cylindrical drum 48 is 1/4 to 3 times the rotational speed of the first cylindrical drum 45, here 5 m / min.

As shown in FIG. 3, of the used cleaning liquid supplied to the circumferential surface of the first cylindrical drum 45 through the shooter 58, chips are generated by the first cylindrical drum 45 by the magnetic force of the first magnet 44. Adsorbed on the surface of The chips rotate while adsorbed on the first cylindrical drum 45 and stay while sliding on the surface of the first cylindrical drum 45 in the vicinity of the end of the plurality of first magnets 44 arranged in the rotation direction. . At this time, the first magnets 44 adjacent in the axial direction are arranged so as to alternate with the N pole and the S pole. Therefore, the chips rotate smoothly in accordance with this.
Chips staying in the vicinity of the end of the first magnet 44 group in the rotational direction are scraped by the scraping member 60 and collected at a constant amount.

Next, a process in which chips move from the first cylindrical drum 45 to the second cylindrical drum 48 by the transfer side magnetic separator 42 will be described with reference to FIG.
The numerical values in FIG. 6 are numerical values obtained by measuring the magnetic flux density at each measurement point of the gap 46 between the first cylindrical drum 45 and the second cylindrical drum 48, and the unit is Gauss. Coordinates are represented by alphabets D to M written in the upper part of the sections partitioned in a grid pattern in the vertical and horizontal directions and 1 to 16 lines arranged vertically on the right side. For example, the magnetic flux density at the point (M, 1) is 30 Gauss.

  The chips adsorbed on the surface of the first cylindrical drum 45 and rotated to move move upward from the vicinity of (L, 16). At this time, the change in magnetic flux density gradually decreases from 2200 Gauss. Next, comparing changes in the magnetic flux density in the horizontal direction, in the range of (I, 16) to (M, 16) of 16 rows, 900 to 2200 gauss is larger on the right side of FIG. In the range, 2900 to 900 gauss and the left side of FIG. 6 is larger. And in the 9th to 6th lines, the difference in magnetic flux density between the left side and the right side in FIG. That is, the chips carried upward from the vicinity of (L, 16) by the scraping member 60 are gradually moved to the second cylindrical drum 48 on the left side of FIG. It is attracted and finally jumps toward the surface of the second cylindrical drum 48.

At this time, the gap 46 between the drums 45 and 48 may be 15 to 50 mm so as not to sandwich the scraping member 60. When the chips move through the gap 46, most of the used cleaning liquid adhering to the surface of the chips is wiped off here, and only the almost chips are adsorbed on the second cylindrical drum 48. At this time, the moving distance of the chips is as large as 15 to 50 mm, and the effect of removing the used cleaning liquid is great.
When the scrap reaches the end of the second cylindrical drum 48 on the side opposite to the gap 46 (rotation position of approximately one quarter of the second cylindrical drum 48), the scraper 70 causes the scrap to be cut. Is scraped off from the outer peripheral surface of the second cylindrical drum 48 and discharged to the outside.

After washing for a certain time, the fourth valve 28 is closed and the supply pump 16 is stopped. Thereafter, the fifth valve 31 is opened, and the compressed air from the compressed air generator A is supplied into the cylinder 11 from the upper part of the cylinder 11 through the compressed air supply pipe 33. Thereby, the cleaned liquid remaining in the cylinder 11 is supplied from the lower part of the cylinder 11 through the cleaning liquid discharge pipe 25 to the shooter 58 of the transfer side magnetic separator 41. After a certain time, the second valve 24 and the fifth valve 31 are closed.
Then, the cooling fan 19 is actuated again, the magnetic sphere 12 in the cylinder 11 is excited by the exciting coil 13, the first valve 21 and the sixth valve 34 are opened, and the slurry oil pump 14 supplies the waste oil reservoir 22. The waste oil is gradually supplied into the cylinder 11 from below.

  As described above, since the waste oil is supplied into the cylindrical body 11 from below, the waste oil stays in the cylindrical body 11 for a longer time than in the past. As a result, the amount of chips in the waste oil that are magnetically attached to the magnetic spheres 12 increases, and the removal efficiency of the magnetic spheres 12 increases. Moreover, when the waste oil is supplied, the possibility that the chips are biased and adsorbed to the magnetic spheres 12 in the upper part of the cylinder 11 is eliminated, and the chips are adhered to all the magnetic spheres 12 in the cylinder 11 substantially uniformly. be able to. As a result, the chips removed from the magnetic sphere 12 can be efficiently discharged together with the cleaning liquid from below the cylindrical body 11 simply by supplying the cleaning liquid into the cylindrical body 11 from above during cleaning. As a result, the cleaning efficiency of the magnetic sphere 12 can be increased.

Further, the discharge of the liquid from the cylindrical body 11 and the discharge of the cleaning liquid after the cleaning from the cylindrical body 11 are forcibly performed by the compressed air generated by the compressed air generator A, respectively. Thereby, the discharge time of the liquid from the cylinder 11 and the cleaning liquid after cleaning can be shortened.
Further, at the time of cleaning each magnetic sphere 12, each magnetic sphere 12 is cleaned while being vibrated along with the vibration of the cylinder 11. Thereby, the chips adhering to the magnetic sphere 12 can be effectively removed.

  Furthermore, as described above, the chips contained in the used cleaning liquid are attracted to the outer peripheral surface of the first cylindrical drum 45 by a magnetic force, and then at the transfer position, the transfer-side magnetic separator 41 and the jump magnetic separator 42 Due to the magnetic gradient, chips from the cleaned cleaning liquid jump to the outer peripheral surface of the second cylindrical drum 48 and are adsorbed. That is, the cleaning liquid remains on the outer peripheral surface of the first cylindrical drum 45, and only chips with a small amount of cleaning liquid attached are attached to the outer peripheral surface of the second cylindrical drum 48. As a result, the cleaning liquid is later dropped from the outer peripheral surface of the first cylindrical drum 45 into the cleaning liquid storage tank 59 due to its own weight, and the recovery amount is increased compared to the conventional case. In addition, since the waste collected by the scraper 70 is not chips with a large amount of cleaning liquid attached as in the prior art, but is chips with a small amount of cleaning liquid attached, the amount of waste discarded can be reduced. . As a result, it is possible to simultaneously increase the amount of cleaning liquid recovered and reduce the amount of waste.

Claims (7)

An upper opening is formed at the upper end, a lower opening is formed at the lower end, and an electric current is passed through an excitation coil provided on the outer periphery of a cylindrical body containing a large number of magnetic bodies. An excitation process to excite,
Simultaneously with excitation or after excitation, supplying a liquid in which magnetic foreign matter is mixed into the cylinder from the lower opening, and magnetizing the magnetic foreign matter to the excited magnetic body,
After the magnetic deposition, the liquid supply process is stopped, and the liquid in the cylinder is discharged from the lower opening; and
After draining, the magnetic body is demagnetized, cleaning liquid is supplied into the cylinder from the upper opening to wash away magnetic foreign matter adhering to the magnetic body, and cleaning after discharging the cleaning liquid from the lower opening is performed. Process,
An adsorption transfer step of adsorbing magnetic foreign substances contained in the cleaning liquid to the outer peripheral surface of the transfer member by magnetic force from the cleaning liquid after cleaning;
When the magnetic foreign matter has reached the jumping position approaching the outer peripheral surface of the jumping member, the magnetic foreign matter jumps by the magnetic gradient between the transfer member and the jumping member. A transfer step to adsorb to the outer peripheral surface of the transfer member;
A method for removing magnetic foreign matter from a liquid, comprising: a separation step of transferring the magnetic foreign matter to a separation position by the jumping member, and removing the magnetic foreign matter from the outer peripheral surface of the jumping member. The discharge of the liquid in the cylinder in the draining process and the discharge of the cleaning liquid after the cleaning in the cleaning process are performed by compressed air supplied into the cylinder. Removal method. The method for removing magnetic foreign matter from a liquid according to claim 1 or 2, wherein in the cleaning step, the magnetic foreign matter magnetically attached to each magnetic body is washed while vibrating the cylindrical body. A cylinder having an upper opening formed at the upper end and a lower opening formed at the lower end;
A large number of magnetic bodies housed inside the cylinder;
An excitation coil provided on an outer periphery of the cylindrical body and exciting a magnetic body in the cylindrical body;
Liquid supply means for supplying a liquid in which magnetic foreign matter is mixed from the lower opening into the cylindrical body,
A processing liquid discharging means for discharging the processed liquid from which magnetic foreign substances are magnetically attached to and removed from the magnetic body by excitation by the exciting coil;
Liquid discharging means for discharging the liquid in the cylinder from the lower opening;
Cleaning liquid supply means for supplying a cleaning liquid from the upper opening in the cylinder,
At the magnetic separation position where the cleaning liquid after cleaning is supplied, the magnetic foreign matter contained in the cleaning liquid after cleaning is attracted to the outer peripheral surface by magnetic force, and the adsorbed magnetic foreign matter is moved from the magnetic selection position. A transfer member capable of transporting up to
When the magnetic foreign matter reaches the jump position by the transfer member, the magnetic foreign matter jumps from the outer peripheral surface of the transfer member to the outer peripheral surface due to a magnetic gradient with the transfer member, With
The jumping member is a device for removing magnetic foreign matter from a liquid that can move the magnetic foreign matter adsorbed on the outer peripheral surface thereof from the suction position to a separate disengagement position so as to be removable from the outer peripheral surface. The magnetic foreign matter from the liquid according to claim 4, wherein the discharge of the liquid in the cylinder and the discharge of the cleaning liquid after cleaning from the cylinder are performed by compressed air supplied from the compressed air generating means to the cylinder. Removal device. The apparatus for removing magnetic foreign matter from a liquid according to claim 4 or 5, wherein the cylindrical body is provided with a vibrating means for vibrating the cylindrical body when each magnetic body is cleaned. The transfer member and the flying member are
A non-magnetic cylindrical drum on which a magnetic foreign object is placed on the outer peripheral surface, a rotating means for rotating the cylindrical drum in the circumferential direction, and a portion of the internal space of the cylindrical drum facing the magnetic force sorting position And a permanent magnet having a fixed position in the circumferential direction of the cylindrical drum,
The magnetic force that acts on the outer peripheral surface of the cylindrical drum of the transfer member is greater than the magnetic force that acts on the outer peripheral surface of the cylindrical drum of the transfer member. A device for removing magnetic foreign substances from liquids.

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