JP2009172590A - Rotary-drum type magnetic separator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary-drum type magnetic separator which has a magnetic flux density increased close to 1 tesla in a vicinity of the outer peripheral surface of the rotary drum and can separate, reliably through adsorption, cut waste, cut powder, etc. which are typically nonmagnetic and are contained in the coolant liquid in minute amounts. <P>SOLUTION: The separator comprises a rotary drum having a built-in inner cylinder arranged with two or more magnets and an outer cylinder made of a nonmagnetic material and being rotatable around the fixed inner cylinder and separates unnecessary matter in the treated coolant liquid. In the inner cylinder, two or more magnets are arranged in the area accounting for nearly three fourths of the peripheral surface in the form of a nearly circular train so that two adjacent magnets face mutually with the same poles. A yoke made of a magnetic or nonmagnetic material is arranged between two circumferentially adjacent magnets, among the magnets arranged. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotary drum type magnetic separation device that collects fine sludge contained in a used coolant liquid.

  In cutting processing, grinding processing, and the like of a magnetic material typified by a metal material, particularly a steel material, cutting waste, chips and the like discharged together with the coolant are collected separately from the liquid. Since cutting waste, chips, and the like have various shapes, various magnetic separation (recovery) devices have been developed from the viewpoint of recovery efficiency.

  For example, Patent Document 1 discloses a conventional rotary drum type magnetic separation device. FIG. 1 is a cross-sectional view taken along a plane orthogonal to the rotation axis of a rotary drum, showing the configuration of a conventional rotary drum type magnetic separation device. As shown in FIG. 1, the conventional rotary drum type magnetic separation device is provided with a liquid reservoir 2 for storing a coolant liquid in a box-shaped main body 1. A rotating drum 3 is pivotally supported in a substantially horizontal direction in the vicinity of the central portion of the main body 1 so as to divide the liquid reservoir 2 into two. The rotating drum 3 has a cylindrical body made of a non-magnetic material such as stainless steel, and an inner cylinder 5 in which a plurality of magnets 4, 4,. It is fixed coaxially inside. The polarities of the plurality of magnets 4, 4,... Generate a predetermined magnetic flux in the vicinity of the outer peripheral surface of the rotating drum 3 so that cutting chips, chips, etc. contained in the coolant liquid can be magnetized. Has been placed.

  In Patent Document 1, a plurality of inner cylinders 5 corresponding to a portion corresponding to approximately three-quarters of the outer periphery of the rotating drum 3, from the portion immersed in the liquid reservoir 2 of the rotating drum 3 to the top, Magnets 4, 4,... Are arranged. The magnets 4, 4,... Are not arranged in the inner cylinder 5 in the portion corresponding to the remaining approximately one quarter, and are configured so that no magnetic force acts.

Sludge adsorbed on the outer peripheral surface of the rotating drum 3 at the bottom of the liquid reservoir 2 by the magnetic force of the magnets 4, 4,... Is conveyed to the top of the rotating drum 3 as the rotating drum 3 rotates. When the magnet passes through the top, the magnet 4 loses the attraction force, and the sludge is scraped off and collected by the scraper 7 in contact with the rotating drum 3. In the vicinity of the top of the rotating drum 3, there is provided a squeezing roller 6 having an elastic body such as rubber disposed on the surface thereof, and is in contact with the outer peripheral surface of the rotating drum 3 with a predetermined pressure. As the adsorbed sludge passes between the rotary drum 3 and the squeezing roller 6, the liquid component contained in the sludge is squeezed out, and only cutting chips, chips, etc. are separated at a position where the magnetic force does not reach. Is done.
JP 2000-079353 A

  In Patent Document 1, a plurality of magnets 4, 4,... Are arranged so that N poles and S poles are generated in the radial direction so as to generate a predetermined magnetic flux in the vicinity of the outer peripheral surface of the rotary drum 3. In such an arrangement, most of the magnetic flux from one magnet 4 enters the adjacent magnet 4 without going out of the rotating drum 3. That is, the so-called effective magnetic flux EM is small, and the magnetic flux density near the outer peripheral surface of the rotary drum 3 is only about 3000 gauss at maximum. Therefore, when the hard magnetic material is polished, the sludge recovery rate in the conventional magnetic separation device remains at about 80% by weight, which causes a cost increase factor such as requiring a secondary filtration device.

  On the other hand, even non-magnetic materials include non-magnetic materials containing a small amount of magnetic material. In typical aluminum die-casting, a small amount of magnetic material is also contained in sludge by polishing or the like. However, when the magnetic flux density in the vicinity of the outer peripheral surface of the rotating drum 3 is about 3000 gauss, the aluminum die cast cannot be adsorbed together with a small amount of magnetic material. There is a problem that a process for separating the magnetic material is required.

  The present invention has been made in view of such circumstances, and by changing the arrangement of the magnets and devising the arrangement of the yoke, the magnetic flux density near the outer peripheral surface of the rotating drum is increased to about 1 Tesla, It is an object of the present invention to provide a rotating drum type magnetic separation device capable of reliably adsorbing and separating cutting scraps, chips and the like which are non-magnetic substances in a treated coolant liquid and contain a small amount of magnetic substances.

  In order to achieve the above object, a rotating drum type magnetic separation device according to a first aspect of the present invention includes an inner cylinder in which a plurality of magnets are arranged, and an outer cylinder made of a nonmagnetic material rotates around the fixed inner cylinder. In the rotary drum type magnetic separation device that includes a rotary drum configured to separate unnecessary substances in the processed coolant liquid, the inner cylinder includes a plurality of adjacent magnets so that two adjacent magnets face each other with the same polarity. These magnets are arranged as a substantially annular magnet array on approximately three quarters of the circumferential surface.

  In the first aspect of the invention, an inner cylinder in which a plurality of magnets are arranged is built in, and a rotating drum is provided around which the outer cylinder made of a nonmagnetic material rotates around the fixed inner cylinder. By arranging a plurality of magnets in a substantially three-quarters of the peripheral surface as a substantially annular magnet row so that two adjacent magnets face each other with the same polarity, the magnetic fluxes repel each other and the magnetic flux density increases. . When a non-magnetic material contains a small amount of magnetic material, the magnetic material component can be adsorbed by the strong magnetic force generated in this way, and the non-magnetic material that could not be adsorbed by a conventional rotating drum The body can be adsorbed and separated. Therefore, it is not necessary to separately provide a device for secondarily separating only the non-magnetic material, and it is possible to provide a low-cost rotating drum type magnetic separation device.

  A rotating drum type magnetic separation device according to a second aspect of the present invention is the rotary drum type magnetic separation device according to the first aspect, wherein a yoke made of a magnetic material or a nonmagnetic material is provided between two magnets adjacent in the circumferential direction among the plurality of magnets. It is characterized by being sandwiched.

  In the second invention, a magnetic field line having a strong magnetic flux density due to repulsion of magnetic flux from the tip of the yoke is provided by sandwiching a yoke made of a magnetic material or a non-magnetic material between two magnets adjacent in the circumferential direction. As a result, the magnetic flux density near the outer peripheral surface of the rotating drum can be increased.

  According to a third aspect of the present invention, there is provided the rotary drum type magnetic separation apparatus according to the second aspect, wherein the yoke is sandwiched between a part of the outer peripheral side between two magnets adjacent in the circumferential direction. .

  In the third invention, since the yoke is sandwiched between a part of the outer peripheral side between two magnets adjacent in the circumferential direction, magnetic flux due to the repulsion of the magnetic pole is easily generated from the tip of the yoke. There is no need to span the entire length. Therefore, cost can be reduced.

  A rotating drum type magnetic separation apparatus according to a fourth aspect of the present invention is the rotating drum type magnetic separation device according to the third aspect of the present invention, in the radial direction of the rotating drum between the two adjacent magnets in the circumferential direction and where the yoke is not sandwiched. A second magnet having a magnetic pole direction is provided, and the second magnet is sandwiched so that the magnetic pole direction is opposite to that of an adjacent second magnet.

  In the fourth invention, the second magnet having the magnetic pole direction in the radial direction of the rotating drum is provided in a portion (inner circumferential side) where the yoke is not sandwiched between two magnets adjacent in the circumferential direction, and adjacent to each other. By sandwiching the second magnets so that the magnetic pole directions of the matching second magnets are opposite to each other, magnetic flux is generated from the tip portion of the yoke with a larger magnetic flux density. Therefore, it becomes possible to more reliably adsorb non-magnetic materials including a small amount of magnetic material.

  A rotating drum type magnetic separation device according to a fifth aspect of the present invention is the rotating drum type magnetic separation device according to any one of the second to fourth aspects of the present invention, on the outer peripheral side of the inner cylinder, for each of the yokes, the magnetic pole directions at both ends of the yoke Are provided with a set of third magnets different from each other, and the set of third magnets has a magnetic pole direction opposite to that of an adjacent set of third magnets.

  In the fifth invention, on the outer peripheral side of the inner cylinder, a set of third magnets having different magnetic pole directions are provided at both ends of the yoke for each yoke. Since a pair of third magnets is opposite in magnetic pole direction to a pair of adjacent third magnets, the repulsive magnetic flux is larger, the magnetic flux density is larger, and the yoke is larger from the tip of the yoke. Magnetic flux is generated at the magnetic flux density. Therefore, it becomes possible to more reliably adsorb non-magnetic materials including a small amount of magnetic material.

  The rotary drum type magnetic separation device according to a sixth aspect of the present invention is the rotary drum type magnetic separation device according to any one of the second to fourth aspects, wherein the yoke is sandwiched from the circumferential direction for each of the yokes on the outer peripheral side of the inner cylinder. A pair of fourth magnets having different magnetic pole directions are provided on both sides of the pair of magnets, and the pair of fourth magnets has a magnetic pole direction opposite to that of a pair of adjacent fourth magnets. Features.

  In the sixth invention, a set of fourth magnets having different magnetic pole directions are provided on both sides of the yoke so as to be sandwiched from the circumferential direction for each yoke on the outer peripheral side of the inner cylinder. Since a pair of fourth magnets has a magnetic pole direction opposite to that of a pair of adjacent fourth magnets, the repulsive magnetic flux is increased, the magnetic flux density is increased, and is increased from the tip of the yoke. Magnetic flux is generated at the magnetic flux density. Therefore, it becomes possible to more reliably adsorb non-magnetic materials including a small amount of magnetic material.

  According to a seventh aspect of the present invention, there is provided the rotary drum type magnetic separation device according to the second aspect, wherein the yoke has a wedge shape and is sandwiched between two magnets adjacent in the circumferential direction. To do.

  In the seventh invention, the yoke has a wedge shape and is sandwiched between two magnets adjacent in the circumferential direction. Since the yoke has a wedge shape, magnetic flux is generated from the tip portion of the yoke with a larger magnetic flux density. Therefore, it becomes possible to more reliably adsorb non-magnetic materials including a small amount of magnetic material.

  The rotating drum type magnetic separation device according to an eighth aspect of the present invention is the rotating drum type magnetic separation device according to any one of the first to seventh aspects, wherein the plurality of magnets constitute a plurality of magnet rows in a rotation axis direction. A plurality of columns are juxtaposed at predetermined intervals.

  In the eighth invention, the plurality of magnets constitute a plurality of magnet rows in the rotation axis direction, and the plurality of magnet rows are juxtaposed at a predetermined interval. By using a plurality of magnet arrays, magnetic flux is generated in a wider range and with a larger magnetic flux density. Therefore, it becomes possible to more reliably adsorb non-magnetic materials including a small amount of magnetic material.

  The rotating drum type magnetic separation device according to a ninth aspect of the present invention is the rotary drum type magnetic separation device according to any one of the first to eighth aspects, wherein the plurality of magnets are fixed to the inner cylinder via dovetail grooves. It is characterized by.

  In the ninth invention, the plurality of magnets are fixed to the inner cylinder via dovetail grooves. By using the dovetail groove, even when a strong magnetic force acts in the radial direction, the magnet does not have a risk of jumping out in the radial direction, and can be manufactured safely.

  The rotating drum type magnetic separation device according to a tenth aspect of the present invention is the rotating drum type magnetic separation device according to any one of the first to ninth aspects, wherein the squeezing roller is in contact with the outer peripheral surface near the top. The magnetic flux density in the vicinity of the outer peripheral surface of the rotating drum is gradually reduced in the portion in the rotation direction of the outer cylinder from the contact portion of the squeezing roller.

  In the tenth aspect of the invention, in the rotating drum, the squeezing roller is brought into contact with the outer peripheral surface in the vicinity of the top, and the magnetic flux in the vicinity of the outer peripheral surface of the rotating drum is in the portion in the rotation direction of the outer cylinder from the contact portion of the squeezing roller. The density is gradually reduced. In order to reliably collect the magnetic material attracted to the rotating drum and guided to the squeezing roller by the rotation of the outer cylinder, after passing through the squeezing roller, the magnetic flux density in the vicinity of the outer peripheral surface of the rotating drum is gradually reduced to reduce the sludge. Can be reliably scraped off with a scraper or the like.

  The rotating drum type magnetic separation device according to an eleventh aspect of the invention is the rotary drum type magnetic separation device according to the tenth aspect of the invention, wherein the plurality of magnets arranged at positions in the rotational direction of the outer cylinder from the contact portion of the squeezing roller A magnet having a gradually lower magnetic force than a contact portion of the roller is arranged.

  In the eleventh invention, the plurality of magnets arranged at positions in the rotation direction of the outer cylinder from the contact portion of the squeezing roller are magnets whose magnetic force is gradually smaller than that of the contact portion of the squeezing roller. Thereby, after passing through the squeezing roller, by gradually reducing the magnetic flux density in the vicinity of the outer peripheral surface of the rotating drum, it is possible to reliably collect the sludge adsorbed by the rotating drum and passing through the squeezing roller by the rotation of the outer cylinder. .

  A rotating drum type magnetic separation device according to a twelfth aspect of the present invention is the rotating drum type magnetic separation device according to the eleventh aspect, wherein the plurality of magnets arranged at positions in the rotational direction of the outer cylinder from the contact portion of the squeezing roller It is arranged so that the size in the radial direction becomes gradually smaller than the contact portion of the roller.

  In the twelfth invention, the plurality of magnets arranged at positions in the rotational direction of the outer cylinder from the contact portion of the squeezing roller are arranged so that the size in the radial direction is gradually smaller than the contact portion of the squeezing roller. Thereby, after passing through the squeezing roller, by gradually reducing the magnetic flux density in the vicinity of the outer peripheral surface of the rotating drum, it is possible to reliably collect the sludge adsorbed by the rotating drum and passing through the squeezing roller by the rotation of the outer cylinder. .

  A rotating drum type magnetic separation device according to a thirteenth aspect of the present invention is arranged at a position in the rotational direction of the outer cylinder from the contact portion of the squeezing roller in any one of the tenth to twelfth aspects of the invention. The yoke is characterized in that the height in the radial direction is gradually lower than the contact portion of the squeezing roller.

  In the thirteenth invention, the yoke arranged at the position in the rotational direction of the outer cylinder from the contact portion of the squeezing roller is arranged so that the yoke height in the radial direction gradually becomes lower than the contact portion of the squeezing roller. Yes. Thereby, after passing through the squeezing roller, by gradually reducing the magnetic flux density in the vicinity of the outer peripheral surface of the rotating drum, it is possible to reliably collect the sludge adsorbed by the rotating drum and passing through the squeezing roller by the rotation of the outer cylinder. .

  According to the above configuration, magnetic fluxes repel each other by arranging a plurality of magnets as a substantially annular magnet array on approximately three-fourths of the peripheral surface so that two adjacent magnets face each other with the same polarity. , The magnetic flux density increases. When a non-magnetic material contains a small amount of magnetic material, the magnetic material component can be adsorbed by the strong magnetic force generated in this way, and the non-magnetic material that could not be adsorbed by a conventional rotating drum The body can also be adsorbed and separated. Therefore, it is not necessary to separately provide a device for secondarily separating only the non-magnetic material, and it is possible to provide a low-cost rotating drum type magnetic separation device.

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof. FIG. 2 is a cross-sectional view taken along a plane orthogonal to the rotation axis of the rotary drum, showing the configuration of the rotary drum type magnetic separation device according to the embodiment of the present invention. As shown in FIG. 2, the rotary drum type magnetic separation device according to the present embodiment is provided with a liquid reservoir portion 2 for storing a coolant liquid in a box-shaped main body 1. A rotating drum 3 is pivotally supported in the vicinity of the central portion of the main body 1 so as to divide the liquid reservoir portion 2 into two substantially horizontally.

  The rotating drum 3 has a cylindrical body made of a non-magnetic material such as stainless steel, and an inner cylinder 5 in which a plurality of magnets 4, 4,. It is fixed coaxially inside. Unlike the prior art, the polarities of the plurality of magnets 4, 4,... Are arranged so as to generate a large magnetic flux of approximately 1 Tesla near the outer peripheral surface of the rotating drum 3.

  FIG. 3 is a front view showing the configuration of the inner cylinder 5 of the rotary drum 3 of the rotary drum type magnetic separation device according to the embodiment of the present invention as seen from the direction of the rotation axis. As shown in FIG. 3, a plurality of magnets 4, 4,... 3 is arranged as a substantially annular magnet array. That is, a plurality of magnets 4, 4,... Are arranged so that the N pole and S pole are arranged in the circumferential direction, and the same poles are arranged so as to face each other.

  As described above, by arranging the plurality of magnets 4, 4,..., The magnetic fluxes between the two adjacent magnets 4, 4 repel each other, and most of them exit to the outside in the radial direction. That is, the effective magnetic flux EM exiting to the outside increases significantly. FIG. 4 is a partial schematic view showing the direction and flow of the magnetic flux in the inner cylinder 5 of the rotary drum type magnetic separation device according to the embodiment of the present invention as seen from the direction of the rotation axis.

  4, yokes 10, 10,... Made of SPCC, for example, are sandwiched between two adjacent magnets 4, 4. In FIG. By interposing the yokes 10, 10,..., The direction of the effective magnetic flux EM that goes out can be controlled more easily. The material of the yokes 10, 10,... May be a magnetic material such as SPCC or a non-magnetic material.

  As shown in FIG. 4, when the magnetic fluxes between the two adjacent magnets 4 and 4 are opposed to each other, they repel each other, most of them jump out in the radial direction, and the adjacent yokes 10, 10,.・ Turn in the direction. When the magnetic flux between the two adjacent magnets 4 and 4 is not opposed to each other, the magnetic flux from the outside is drawn. That is, the magnetic flux that has come out is drawn.

  In FIG. 2, a plurality of magnets are provided on the inner cylinder 5 corresponding to a portion corresponding to approximately three-quarters of the outer periphery of the rotating drum 3 from the portion immersed in the liquid reservoir 2 of the rotating drum 3 to the top. 4, 4, ... are arranged. The magnets 4, 4,... Are not arranged in the inner cylinder 5 in the portion corresponding to the remaining approximately one quarter, and are configured so that no magnetic force acts.

  Sludge adsorbed on the outer peripheral surface of the rotating drum 3 at the bottom of the liquid reservoir 2 by the magnetic force of the magnets 4, 4,... Is conveyed to the top of the rotating drum 3 as the rotating drum 3 rotates. When the magnet passes through the top, the magnet 4 loses the attraction force, and the sludge is scraped off and collected by the scraper 7 in contact with the rotating drum 3. In the vicinity of the top of the rotating drum 3, there is provided a squeezing roller 6 having an elastic body such as rubber disposed on the surface thereof, and is in contact with the outer peripheral surface of the rotating drum 3 with a predetermined pressure. As the adsorbed sludge passes between the rotary drum 3 and the squeezing roller 6, the liquid component contained in the sludge is squeezed out, and only cutting chips, chips, etc. are separated at a position where the magnetic force does not reach. Is done.

  With such a configuration, magnetic fluxes from the plurality of magnets 4, 4,... Arranged on the rotary drum 3 repel each other, and the magnetic flux density near the surface of the rotary drum 3 increases. When a non-magnetic material contains a very small amount of magnetic material, the magnetic material component can be adsorbed by the strong magnetic force generated in this way, and the conventional rotating drum 3 cannot adsorb. It can be adsorbed and separated including magnetic materials. Therefore, it is not necessary to separately provide, for example, a secondary filtration device that separates only the non-magnetic material secondarily, and it is possible to provide a low-cost rotating drum type magnetic separation device.

  FIG. 5 is a perspective view showing the configuration of the magnet holder 11 used in the rotary drum 3 of the rotary drum type magnetic separation device according to the embodiment of the present invention. The magnet holder 11 is made of a non-magnetic material such as stainless steel (for example, SUS304), Cu, Al, brass, etc., and as shown in FIG. 5, the magnets 4, 4,. In order to fix it safely, magnets 4, 4,... Are mounted through dovetail grooves 12. Similarly, the yokes 10, 10,... Are also mounted through the dovetail grooves 13.

  6 shows a state in which the magnets 4, 4,... And the yokes 10, 10,... Are mounted on the magnet holder 11 used in the rotating drum 3 of the rotating drum type magnetic separation device according to the embodiment of the invention. It is a perspective view showing typically. For example, in the direction of the arrow shown in FIG. 6, first, one yoke 10 is fitted into one dovetail groove 13, and then one magnet 4 is fitted into one dovetail groove 12. Hereinafter, by sequentially fitting the yoke 10 and the magnet 4 into the dovetail grooves 13, 12, the magnets 4, 4,... Repelling each other do not jump out in the circumferential direction. Can be fixed to the magnet holder 11.

  7 shows a state in which the magnets 4, 4,... And the yokes 10, 10,... Are mounted on the magnet holder 11 used in the rotating drum 3 of the rotating drum type magnetic separation device according to the embodiment of the invention. It is a perspective view showing typically. As shown in FIG. 7, the magnets 4, 4,... And the yokes 10, 10,. Needless to say, the method of fixing the magnets 4, 4,... To the magnet holder 11 is not limited to the method through the dovetail.

  As can be seen from FIGS. 6 and 7, the plurality of magnets 4, 4,... Are arranged on approximately three quarters of the peripheral surface of the rotating drum 3. And in the one end part in the rotation direction of the outer cylinder 9, it arrange | positions so that the magnitude | size of the magnet 4,4, ... may become small gradually. That is, the magnet 4a is smaller than the magnet 4 and the magnet 4b is further smaller than the magnet 4a.

  This is because the magnetic force on the surface of the rotating drum 3 is higher than that of the conventional rotating drum type magnetic separation device, so that the sludge adheres firmly to the surface of the rotating drum 3 and the scraper 7 alone cannot scrape the sludge. Can occur. Therefore, after the sludge is adsorbed and moved, that is, after the liquid content is removed by the squeezing roller 6, the outer cylinder 9 is moved from the position where the squeezing roller 6 is in contact with the outer peripheral surface of the rotary drum 3. For the magnets 4, 4,... Arranged in the rotation direction, it is preferable to arrange, for example, the magnets 4, 4,.

  In the present embodiment, the same magnets 4, 4,... Are arranged up to the position where the squeezing roller 6 is in contact with the outer peripheral surface of the rotary drum 3, and the magnetic force gradually decreases after that. The magnets 4, 4,... Having a small radial size are arranged. Of course, it is not limited to such a configuration, and the yokes 10, 10,... Arranged in the rotation direction of the outer cylinder 9 from the position where the squeezing roller 6 is in contact with the outer peripheral surface of the rotary drum 3. The magnetic flux density in the vicinity of the surface of the rotating drum 3 is gradually reduced even if the height of is arranged so as to be gradually lowered.

  FIG. 8 is a perspective view schematically showing components of the rotary drum 3 of the rotary drum type magnetic separation device according to the embodiment of the present invention. For the sake of clarity, the number of the magnet units 30 is three, and the leftmost magnet unit 30 is displayed with no magnets attached. As shown in FIG. 8, a plurality of magnet units 30, 30,... Are rotated by using a magnet array in which a plurality of magnets 4, 4,. By providing a plurality of drums 3 in the rotation axis direction and juxtaposing them at a predetermined interval, the inner cylinder 5 of the rotation drum 3 is formed.

  First, with the magnets 4, 4,... And the yokes 10, 10,... Arranged in the magnet holder 11, the magnet end surface pressing rings 16, 16 are fixed by fixing screws 20, 20,. To do. As a result, the magnets 4, 4, ... and the yokes 10, 10, ... are fixed to the magnet holders 11, 11, ... to form magnet units 30, 30, ....

  Next, the magnet holder fixing ring 15 is fitted to the rotating drum shaft 14 and attached to the magnet units 30, 30,... With the fixing bolts 21, 21,. Thereby, the magnet units 30, 30,... Can be attached to the rotating drum shaft 14, and the magnet row can be rotated according to the rotation of the rotating drum shaft 14.

  In order to align the rotational positions of the magnet units 30, 30,..., The magnet arrangement of the plurality of magnet units 30, 30,. To do. In this way, the inner cylinder 5 of the rotary drum 3 is completed.

  FIG. 9 is a cross-sectional view of a surface including the rotary drum shaft 14 showing a completed state of the inner cylinder 5 of the rotary drum 3 of the rotary drum type magnetic separation device according to the embodiment of the present invention. 9, the magnets 4, 4,... And the yokes 10, 10,... Are fixed from both sides by magnet end surface pressing rings 16, 16, and the magnet units 30, 30,. It is fixed to the rotating drum shaft 14 by a magnet holder fixing ring 15. And the magnet arrangement | positioning of several magnet units 30, 30, and ... can be arrange | equalized and fixed by unit fixing bolt 22,22, ....

  FIG. 10 is a perspective view showing a completed state of the inner cylinder 5 of the rotary drum 3 of the rotary drum type magnetic separation device according to the embodiment of the present invention. By fixing the inner cylinder 5 having such a configuration and rotating the outer cylinder 9, the magnetic component is adsorbed and the non-magnetic material that cannot be adsorbed by the conventional rotating drum 3 is adsorbed. Thus, it is possible to provide a rotary drum type magnetic separation device that can be separated.

  FIG. 11 is a graph comparing the surface magnetic force of the rotating drum 3 of the conventional rotating drum type magnetic separation device with the surface magnetic force of the rotating drum 3 of the rotating drum type magnetic separation device according to the embodiment of the present invention. In FIG. 11, the relationship between the distance from the surface of the conventional rotating drum 3 and the surface magnetic force is indicated by a broken line 112, and the distance from the surface of the rotating drum 3 and the surface of the rotating drum type magnetic separation device according to the embodiment of the present invention. The relationship with the magnetic force is indicated by a solid line 111, respectively. As can be seen by comparing the two, the surface of the rotary drum 3 has a limit of 0.4 Tesla in the configuration of the conventional rotary drum 3, whereas the configuration of the rotary drum 3 according to the present embodiment is 1 It can be seen that a strong magnetic force exceeding 1 Tesla is generated. Therefore, the magnetic substance component can be reliably adsorbed by the strong magnetic force generated in this way, and it is adsorbed and separated, including non-magnetic substances that could not be adsorbed by the conventional rotary drum type magnetic separation device. can do. Therefore, it is not necessary to separately provide, for example, a secondary filtration device that separates only the non-magnetic material secondarily, and it is possible to provide a low-cost rotating drum type magnetic separation device.

  In the above-described embodiment, the shape of the yokes 10, 10,... Is a thin plate, and is sandwiched between part of the outer peripheral side between the two magnets 4, 4 adjacent in the circumferential direction. However, the present invention is of course not limited to such a shape and arrangement.

  FIG. 12 is a partial cross-sectional view and a partial side view of the rotary drum 3 schematically showing a configuration when the yoke 10 of the rotary drum 3 according to the embodiment of the present invention has another shape. FIG. 12A is a partial cross-sectional view of the rotating drum 3 schematically showing the configuration when the yoke 10 of the rotating drum 3 according to the embodiment of the present invention has another shape, and FIG. These are the partial side views of the rotating drum 3 which show typically the structure in case the yoke 10 of the rotating drum 3 which concerns on embodiment of this invention is another shape.

  As shown in FIG. 12, the yokes 10, 10,... Have a wedge shape and are sandwiched between two magnets 4 and 4 adjacent in the circumferential direction. The wedge-shaped tip angle may be set to an angle at which the surface magnetic force of the rotating drum 3 is maximized according to the number of poles of the magnets 4, 4,.

  Further, in the above-described embodiment, the portion supporting the yokes 10, 10,... Is a non-magnetic material, but the portion where the yokes 10, 10,. A second magnet having a magnetic pole direction in the radial direction of the drum 3 may be provided.

  FIG. 13 is a partial cross-sectional view and a partial side view of the rotary drum 3 schematically showing a configuration in the case where a magnet is disposed on the support portion of the yoke 10 of the rotary drum 3 according to the embodiment of the present invention. FIG. 13A is a partial cross-sectional view of the rotary drum 3 schematically showing a configuration in the case where a magnet is arranged on the support portion of the yoke 10 of the rotary drum 3 according to the embodiment of the present invention. FIG. 4B is a partial side view of the rotating drum 3 schematically showing a configuration in the case where a magnet is arranged on the support portion of the yoke 10 of the rotating drum 3 according to the embodiment of the present invention.

  As shown in FIG. 13, the second magnets 41, 41,... Are arranged on the support portion of the yoke 10 of the rotary drum 3 according to the embodiment of the present invention, and the second magnets 41, 41,. -Indicates that the magnetic flux jumps out of the yoke 10, that is, the yoke 10 sandwiched in a position where the N poles are adjacent to each other, the direction in which the magnetic flux goes out, that is, the N pole side is in contact with the yoke 10. To place. On the other hand, inside the yoke 10 where the magnetic flux enters, that is, the yoke 10 sandwiched between the positions where the S poles are adjacent to each other, the direction in which the magnetic flux goes out toward the rotation center, that is, the S pole side is in contact with the yoke 10. Deploy. By doing so, it can be expected that a stronger magnetic force is generated on the surface of the rotating drum 3.

  Further, a third magnet may be provided in the vicinity of the peripheral surface of the rotary drum 3 so as to sandwich the yokes 10, 10,. FIG. 14 is a partial cross-sectional view and a partial side view of the rotary drum 3 schematically showing a configuration when magnets are arranged at both end portions of the yoke 10 of the rotary drum 3 according to the embodiment of the present invention. FIG. 14A is a partial cross-sectional view of the rotary drum 3 schematically showing a configuration in the case where magnets are arranged at both end portions of the yoke 10 of the rotary drum 3 according to the embodiment of the present invention. b) is a partial side view of the rotating drum 3 schematically showing a configuration in the case where magnets are arranged at both end portions of the yoke 10 of the rotating drum 3 according to the embodiment of the present invention.

  As shown in FIG. 14, second magnets 41, 41,... Are arranged on the support portion of the yoke 10 of the rotary drum 3 according to the embodiment of the present invention, and are further opposed to both end portions of the yoke 10. It has the 3rd magnets 42, 42, ... which have a magnetic pole direction. The yoke 10 from which the magnetic flux jumps out from the yoke, that is, the both ends of the yoke 10 sandwiched between the positions where the N poles are adjacent to each other, is the direction in which the magnetic flux goes out, that is, the N pole side is in contact with the yoke 10. To place. On the other hand, the direction in which the magnetic flux exits toward the center of rotation, that is, the S pole side is in contact with the yoke 10 at both ends of the yoke 10 where the magnetic flux enters, ie, the yoke 10 sandwiched between the positions where the S poles are adjacent to each other. To place. By doing so, it can be expected that a stronger magnetic force is generated on the surface of the rotating drum 3.

  In addition, a fourth magnet may be provided in the vicinity of the circumferential surface of the rotating drum 3 so as to sandwich the yokes 10, 10,. FIG. 15 is a partial cross-sectional view and a partial side view of the rotary drum 3 schematically showing a configuration in the case where magnets are arranged on both sides in the circumferential direction of the yoke 10 of the rotary drum 3 according to the embodiment of the present invention. . FIG. 15A is a partial cross-sectional view of the rotary drum 3 schematically showing a configuration in the case where magnets are arranged on both sides in the circumferential direction of the yoke 10 of the rotary drum 3 according to the embodiment of the present invention. FIG. 15B is a partial side view of the rotating drum 3 schematically showing a configuration in the case where magnets are arranged on both sides in the circumferential direction of the yoke 10 of the rotating drum 3 according to the embodiment of the present invention.

  As shown in FIG. 15, second magnets 41, 41,... Are arranged on the support portion of the yoke 10 of the rotary drum 3 according to the embodiment of the present invention, and are further provided on both side portions of the yoke 10 in the circumferential direction. The fourth magnets 43, 43,... Having magnetic pole directions facing each other are provided. The yoke 10 from which the magnetic flux jumps out of the yoke, that is, the both sides in the circumferential direction of the yoke 10 sandwiched at the position where the N poles are adjacent to each other, the direction in which the magnetic flux goes out, that is, the N pole side is the yoke 10. Arrange to touch. On the other hand, the yoke 10 into which the magnetic flux enters, that is, the both sides in the circumferential direction of the yoke 10 sandwiched between the positions where the S poles are adjacent to each other, is the direction in which the magnetic flux exits toward the rotation center, that is, the S pole side. Arrange to touch. By doing so, it can be expected that a stronger magnetic force is generated on the surface of the rotating drum 3.

  In addition, the adsorption effect of the hardly magnetic substance in the processed coolant liquid of the rotating drum type magnetic separation apparatus according to the present embodiment was compared with the conventional model. FIG. 16 is a graph comparing the recovery rate of the hardly magnetic material between the rotating drum type magnetic separation apparatus according to the embodiment of the present invention and the conventional rotating drum type magnetic separation apparatus. In FIG. 16, the recovery rate calculated based on the number of particle sizes for each particle diameter of the hard magnetic material recovered from the cutting waste in the cylindrical grinder that grinds the workpiece SK3 using the # 80 grindstone is displayed. In addition, water-soluble Yushiroken FGC822J was used for the coolant, and the treatment flow rate was 60 L / min.

  FIG. 16 shows that the hatched bar graph indicates the recovery rate of the rotating drum type magnetic separation apparatus according to the embodiment of the present invention, and the non-hatched bar graph indicates the recovery of the conventional rotating drum type magnetic separation apparatus. Each rate is shown. As is clear from FIG. 16, the recovery rate of the rotary drum type magnetic separation apparatus according to the embodiment of the present invention is higher for all particle sizes.

  FIG. 17 is a graph comparing the recovery rate of the hardly magnetic material between the rotating drum type magnetic separation apparatus according to the embodiment of the present invention and the conventional rotating drum type magnetic separation apparatus. In FIG. 17, the recovery rate calculated based on the mass of the non-magnetic material recovered from the cutting waste in the cylindrical grinder that grinds the workpiece SK3 using the # 80 grindstone is displayed. As in FIG. 16, water-soluble Yushiroken FGC822J was used as the coolant, and the treatment flow rate was 60 L / min.

  In FIG. 17, (a) is a rotating drum using a ferrite magnet, (b) is a rare earth magnet, (c) is a rotating drum having a relatively large rotating drum diameter using a rare earth magnet, and (d). These show the recovery rate in the rotary drum type magnetic separation apparatus using the rotary drum 3 according to the embodiment of the present invention. The diameter of the rotating drum in (c) and the diameter of the rotating drum in (d) are the same. As is clear from FIG. 17, the rotating drum type magnetic separation apparatus according to the embodiment of the present invention has a higher recovery rate than the conventional rotating drum type magnetic separation apparatus using any rotating drum, and It can be seen that almost all of the hard magnetic material can be recovered at a rate of approximately 95%.

  The shape and arrangement of the yoke are not limited to the above-described example, and a plurality of magnets may be provided to increase the magnetic flux density near the surface of the rotating drum 3, or the above-described arrangement example alone. Needless to say, any combination may be used.

  Moreover, in embodiment mentioned above, the case where the arrangement | positioning direction of the magnets 4, 4, ... in the inner cylinder 5 of the rotating drum 3 is arrange | positioned in the same direction as what is called a 20 pole type rotating drum 3 is mentioned as an example. Although described, the arrangement direction of the magnets 4, 4,... Is not limited to the same direction as the 20-pole rotary drum 3, and the arrangement direction can be changed according to the application. Furthermore, although the rotating drum 3 is described as having a configuration in which the magnet units 30 are arranged in three rows, the number of magnet units 30 is not limited to three, and can be changed according to the application. Needless to say.

It is sectional drawing in the surface orthogonal to the rotating shaft of the rotating drum which shows the structure of the conventional rotating drum type magnetic separation apparatus. It is sectional drawing in the surface orthogonal to the rotating shaft of the rotating drum which shows the structure of the rotating drum type magnetic separation apparatus which concerns on embodiment of this invention. It is the front view seen from the rotating shaft direction which shows the structure of the rotating drum of the rotating drum type magnetic separation apparatus which concerns on embodiment of this invention. It is the partial schematic diagram seen from the rotating shaft direction which shows the direction and flow of the magnetic flux of the rotating drum of the rotating drum type magnetic separation apparatus which concerns on embodiment of this invention. It is a perspective view which shows the structure of the magnet holder used for the rotating drum of the rotating drum type magnetic separation apparatus which concerns on embodiment of this invention. It is a perspective view which shows typically the state which attaches a magnet and a yoke to the magnet holder used for the rotating drum of the rotating drum type magnetic separation apparatus which concerns on embodiment of this invention. It is a perspective view which shows typically the mounting state of the magnet and yoke to the magnet holder used for the rotating drum of the rotating drum type magnetic separation apparatus which concerns on embodiment of this invention. It is a perspective view which shows typically the component of the rotating drum of the rotating drum type magnetic separation apparatus which concerns on embodiment of this invention. It is sectional drawing in the surface containing the rotating drum axis | shaft which shows the completion state of the inner cylinder of the rotating drum of the rotating drum type magnetic separation apparatus which concerns on embodiment of this invention. It is a perspective view which shows the completion state of the inner cylinder of the rotating drum of the rotating drum type magnetic separation apparatus which concerns on embodiment of this invention. It is the graph which compared the surface magnetic force of the rotating drum of the conventional rotating drum type magnetic separation apparatus with the surface magnetic force of the rotating drum of the rotating drum type magnetic separation apparatus which concerns on embodiment of this invention. It is the fragmentary sectional view and partial side view of a rotating drum which show typically the composition in case the yoke of the rotating drum which concerns on embodiment of this invention is another shape. It is the fragmentary sectional view and partial side view of a rotating drum which show typically composition at the time of arranging a magnet in a support part of a yoke of a rotating drum concerning an embodiment of the invention. It is the fragmentary sectional view and partial side view of a rotating drum which show typically composition at the time of arranging a magnet at both ends of a yoke of a rotating drum concerning an embodiment of the invention. It is the fragmentary sectional view and partial side view of a rotating drum which show typically composition at the time of arranging a magnet in the both sides of the peripheral direction of the yoke of a rotating drum concerning an embodiment of the invention. It is a graph which compares the collection | recovery rate of the hard-to-magnetic material of the rotating drum type magnetic separation apparatus which concerns on embodiment of this invention, and the conventional rotating drum type magnetic separation apparatus. It is a graph which compares the collection | recovery rate of the hard-to-magnetic material of the rotating drum type magnetic separation apparatus which concerns on embodiment of this invention, and the conventional rotating drum type magnetic separation apparatus.

Explanation of symbols

2 Liquid reservoir 3 Rotating drum 4 Magnet 5 Inner cylinder 6 Drawing roller 9 Outer cylinder 10 Yoke 12, 13 Dovetail groove 41 Second magnet 42 Third magnet 43 Fourth magnet

Claims (13)

An internal cylinder with a plurality of magnets is built in, and a rotating drum with an outer cylinder made of a non-magnetic material rotating around the fixed inner cylinder is used to separate unnecessary substances in the treated coolant liquid. In the rotating drum type magnetic separation device
The inner cylinder is
A rotating drum type magnetic separation device characterized in that a plurality of magnets are arranged as a substantially annular magnet array on approximately three-fourths of the peripheral surface so that two adjacent magnets face each other with the same polarity. .   The rotary drum type according to claim 1, wherein a yoke made of a magnetic material or a non-magnetic material is sandwiched between two magnets adjacent in the circumferential direction among the plurality of magnets. Magnetic separation device.   3. The rotary drum type magnetic separation device according to claim 2, wherein the yoke is sandwiched between a part of the outer peripheral side between two magnets adjacent in the circumferential direction.   A second magnet having a magnetic pole direction in the radial direction of the rotary drum is provided between two magnets adjacent to each other in the circumferential direction where the yoke is not sandwiched, and the second magnet is adjacent to the second magnet. 4. The rotary drum type magnetic separation device according to claim 2, wherein the rotating drum type magnetic separation device is sandwiched so that the magnetic pole direction is opposite to that of the matching second magnet.   On the outer peripheral side of the inner cylinder, each yoke is provided with a pair of third magnets having different magnetic pole directions at both end portions of the yoke, and the pair of third magnets is a pair of adjacent magnets. The rotary drum type magnetic separation device according to any one of claims 2 to 4, wherein a magnetic pole direction is opposite to that of the third magnet.   On the outer peripheral side of the inner cylinder, each yoke is provided with a set of fourth magnets having different magnetic pole directions on both sides of the yoke so as to be sandwiched from the circumferential direction, and the set of fourth magnets includes: 5. The rotating drum type magnetic separation device according to claim 2, wherein a magnetic pole direction is opposite to that of a pair of adjacent fourth magnets.   3. The rotary drum type magnetic separator according to claim 2, wherein the yoke has a wedge shape and is sandwiched between two magnets adjacent in the circumferential direction.   The plurality of magnets constitute a plurality of magnet rows in a rotation axis direction, and a plurality of the magnet rows are juxtaposed at a predetermined interval. Rotating drum type magnetic separation device.   The rotary drum type magnetic separation device according to any one of claims 1 to 8, wherein the plurality of magnets are fixed to the inner cylinder through dovetail grooves. The squeezing roller is in contact with the outer peripheral surface in the vicinity of the top of the rotating drum,
The magnetic flux density in the vicinity of the outer peripheral surface of the rotating drum is gradually decreased in a portion in the rotation direction of the outer cylinder from a contact portion of the squeezing roller. The rotary drum type magnetic separation device according to item.   The plurality of magnets arranged at a position in the rotation direction of the outer cylinder from a contact portion of the squeezing roller is a magnet having a gradually lower magnetic force than the contact portion of the squeezing roller. The rotary drum type magnetic separation device according to claim 10.   The plurality of magnets arranged at positions in the rotation direction of the outer cylinder from the contact portion of the squeezing roller are configured such that the height in the radial direction is gradually lower than the contact portion of the squeezing roller. The rotary drum type magnetic separation device according to claim 11.   The yoke arranged at a position in the rotation direction of the outer cylinder from the contact portion of the squeezing roller is arranged so that the yoke height in the radial direction is gradually lower than the contact portion of the squeezing roller. The rotary drum type magnetic separation device according to any one of claims 10 to 12.

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