JP2014151314A - Rotating drum and rotating drum type magnetic separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotating drum capable of conveying cutting scraps, chips or the like surely to a top part of the rotating drum even when the cutting scraps, the chips or the like generated in a cutting work are inputted, and preventing recovery leakage, and to provide a rotating drum type magnetic separator.SOLUTION: In a rotating drum 3, an internal cylinder 5 in which a plurality of magnets 4, etc., are arranged is fixed, and an external cylinder 9 comprising a non-magnetic material is provided rotatably around the fixed internal cylinder 5. One or a plurality of projection parts 31 continuing from one end side to the other end side are provided on the outer peripheral surface of the external cylinder 9 of the rotating drum 3.

Description

  The present invention relates to a rotating drum and a rotating drum type magnetic separation device for recovering a metal component from sludge contained in a coolant liquid.

  In polishing, cutting and the like of metal materials, particularly magnetic materials represented by steel materials, sludge-like 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, since the chips are powdery, they easily gather and contain liquid components. Therefore, a magnetic separator excellent in separating sludge liquid is required. 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. The 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 having a plurality of magnets 4, 4,. 9 is fixed coaxially. The plurality of magnets 4, 4,... Have magnetic poles so as to generate a predetermined magnetic flux on the outer peripheral surface of the rotating drum 3 so that cutting chips, chips, etc. contained in the coolant liquid can be magnetized. Is arranged.

  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.

  Cutting chips and chips magnetically attached to the outer peripheral surface of the outer cylinder 9 at the bottom of the liquid reservoir 2 by the magnetic force of the magnets 4, 4,. When it passes through the top and passes through the top, it is released from the magnetic force of the magnets 4, 4,..., And is scraped and collected by the scraper 7 in contact with the rotating drum 3. In the vicinity of the top of the rotating drum 3, a squeezing roller 6 having an elastic body such as rubber disposed on the surface thereof is provided, and is brought into contact with the outer peripheral surface of the outer cylinder 9 of the rotating drum 3 with a predetermined pressure. Yes. When the sludge magnetized is passed between the outer cylinder 9 and the squeezing roller 6, the liquid component of the sludge is squeezed out and passes through the top of the rotating drum 3, that is, the magnetic force of the magnet 4 does not reach. Only cutting waste, chips, etc. are separated and recovered at the position.

JP 2000-079353 A

  The rotary drum type magnetic separation device is charged not only with chips and the like generated by the polishing process, but also with chips and chips generated by the cutting process. Cutting chips, chips and the like generated by the cutting process are larger than chips and the like generated by the polishing process, and it is easy to magnetically adhere to the outer peripheral surface of the outer cylinder 9. However, when the magnetic force generated by the magnetic force of the magnets 4, 4,. There was a problem that the drum 3 may stagnate during conveyance to the top.

  The present invention has been made in view of such circumstances, and even when cutting chips, chips, etc. generated by cutting work are charged, the cutting chips, chips, etc. are reliably transferred to the top of the rotating drum. It is an object of the present invention to provide a rotating drum and a rotating drum type magnetic separation device that can be transported to each other and can prevent recovery leakage.

  In order to achieve the above object, in the rotary drum according to the first invention, an inner cylinder in which a plurality of magnets are arranged is fixed, and an outer cylinder made of a nonmagnetic material rotates around the fixed inner cylinder. The rotating drum used in the rotating drum type magnetic separation device is characterized in that one or a plurality of protrusions continuous from one end side to the other end side are provided on the outer peripheral surface of the outer cylinder.

  In the first invention, an inner cylinder in which a plurality of magnets are arranged is fixed, and an outer cylinder made of a nonmagnetic material is rotated around the fixed inner cylinder on the outer peripheral surface of the outer cylinder of the rotating drum. One or a plurality of protrusions continuous from the side to the other end side are provided. Thereby, even if the magnetizing force generated by the magnet on the outer peripheral surface of the outer cylinder is larger than the frictional force of the outer peripheral surface of the outer cylinder, the cutting that is stagnating on the way to the top of the rotating drum Scraps, chips, and the like can be conveyed to the top of the rotating drum by the protrusion. Therefore, even if it is a post-process of cutting, it becomes possible to collect | recover cutting waste, chips, etc. reliably.

  The rotating drum according to a second aspect of the present invention is characterized in that, in the first aspect, the protrusion is formed in a straight line parallel to the rotation axis of the outer cylinder.

  In the second invention, since the protrusion is formed in a straight line parallel to the rotation axis of the outer cylinder, it is difficult to convey by frictional force against the magnetic force. It becomes possible to convey the powder or the like more reliably to the top of the rotating drum.

  The rotating drum according to a third aspect is characterized in that, in the first aspect, the protrusion is formed so as to form a predetermined angle with respect to the rotation axis of the outer cylinder.

  In the third aspect of the invention, since the projection is formed at a predetermined angle with respect to the rotation axis of the outer cylinder, the friction when scraping scraps, chips, etc. with a scraper that contacts the rotary drum. The resistance can be reduced, and the durability of the scraper can be increased.

  According to a fourth aspect of the present invention, there is provided the rotating drum according to any one of the first to third aspects, wherein the protrusions are formed at positions symmetrical to each other about the rotation axis of the outer cylinder. Features.

  In the fourth invention, since the protrusions are formed at positions symmetrical to each other about the rotation axis of the outer cylinder, cutting chips, chips, etc. that could not be conveyed to the top of the rotating drum are protruded. It becomes possible to convey to the top of the rotating drum.

  Next, in order to achieve the above object, a rotating drum type magnetic separation device according to a fifth aspect of the present invention includes any one of the rotating drums according to the first to fourth aspects of the invention.

  In the fifth invention, an inner cylinder having a plurality of magnets is fixed, and an outer cylinder made of a nonmagnetic material is rotated around the fixed inner cylinder on the outer peripheral surface of the outer cylinder of the rotating drum. One or a plurality of protrusions continuous from the side to the other end side are provided. Thereby, even if the magnetizing force generated by the magnet on the outer peripheral surface of the outer cylinder is larger than the frictional force of the outer peripheral surface of the outer cylinder, the cutting that is stagnating on the way to the top of the rotating drum Scraps, chips, and the like can be conveyed to the top of the rotating drum by the protrusion. Therefore, even if it is a post-process of cutting, it becomes possible to collect | recover cutting waste, chips, etc. reliably.

  According to the present invention, even when the magnetizing force generated by the magnet on the surface of the rotating drum is larger than the frictional force of the outer peripheral surface of the outer cylinder, the magnet stays in the middle of conveyance to the top of the rotating drum. The cutting scraps, chips, and the like that are present can be conveyed to the top of the rotating drum by the protrusions. Therefore, even if it is a post-process of cutting, it becomes possible to collect | recover cutting waste, chips, etc. reliably.

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 an illustration figure showing distribution of magnetic flux density of a rotating drum. It is a schematic diagram which shows the structure of the projection part of the outer cylinder of the rotating drum which concerns on embodiment of this invention. It is a schematic cross section in the surface orthogonal to the rotating shaft of a rotating drum which shows the other structure of the protrusion part of the outer cylinder of the rotating drum which concerns on embodiment of this invention. It is a schematic diagram which shows the other structure of the protrusion part of the outer cylinder of the rotating drum which concerns on embodiment of this invention. It is a schematic diagram which shows the other structure of the protrusion part of the outer cylinder of the rotating drum which concerns on embodiment of this invention.

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments. The configuration of the rotary drum type magnetic separation device according to the embodiment of the present invention is the same as that of the conventional rotary drum type magnetic separation device shown in FIG. That is, the rotary drum type magnetic separation apparatus 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, and scraps and chips after polishing or after cutting. The used coolant liquid in which sludge containing etc. is mixed is thrown into the liquid reservoir 2 from the inlet 10.

  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 having a plurality of magnets 4, 4,. 9 is fixed coaxially with the outer cylinder 9. The plurality of magnets 4, 4,. The polarity is arranged to generate. Note that “N” and “S” shown in FIG. 1 indicate the polarities on the outer peripheral surface side of the outer cylinder 9 of the magnet 4.

  In FIG. 1, 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.

  Cutting chips, chips, etc., which are magnetic bodies magnetically attached to the outer peripheral surface of the outer cylinder 9 of the rotary drum 3 at the bottom of the liquid reservoir 2 by the magnetic force of the magnets 4, 4,. As it rotates, it is transported to the top of the rotating drum 3, and when it passes through the top, it is released from the magnetizing force of the magnets 4, 4... And scraped off by the scraper 7 that contacts the outer cylinder 9. Collected. In the vicinity of the top of the rotating drum 3, a squeezing roller 6 having an elastic body such as rubber disposed on the surface thereof is provided, and is brought into contact with the outer peripheral surface of the outer cylinder 9 of the rotating drum 3 with a predetermined pressure. Yes. When the sludge containing cutting scraps, chips and the like magnetized between the outer cylinder 9 and the squeezing roller 6 passes, the liquid content of the sludge is squeezed out, and when the rotary drum 3 passes through the top, That is, only cutting waste, chips and the like are separated and collected at a position where the magnetic force does not reach.

  As the elastic body used for the contact surface of the squeezing roller 6 with the outer peripheral surface of the rotary drum 3, it is mainstream to use an elastic body such as CR (chloroprene) rubber or NBR (nitrile) rubber. You may use the uncrosslinked polyurethane material which has a polyol as a main component.

  The plurality of magnets 4, 4,... Are arranged so that the magnetic poles are alternately arranged, and the magnetic flux emerging from the outer peripheral surface of the outer cylinder 9 is discontinuous. FIG. 2 is an exemplary diagram showing a distribution of magnetic flux density of the rotating drum 3. “Sparse” and “Dense” in FIG. 2 indicate a portion with a large magnetic flux density and a portion with a small magnetic flux density, respectively.

  As shown in FIG. 2, the plurality of magnets 4, 4,... Are arranged on the outer peripheral surface of the inner cylinder 5, and the magnetic poles on the outer peripheral surface side are S pole, N pole, S pole,. They are arranged alternately. By arranging in this way, there is a difference in magnetic flux density between the front surface of the magnet 4 and the gap between the magnets 4 and 4. For example, a portion having a large magnetic flux density and a portion having a small magnetic flux density are generated. Therefore, depending on the magnitude of the magnetic flux density, there is a possibility that a portion where the frictional force between the outer cylinder 9 and the chips, chips, etc. is smaller than the magnetic adhesion force may be generated.

  And when the part where the frictional force between the outer cylinder 9 and the cutting waste, chips, etc. is smaller than the magnetic adhesion force, for example, in the vicinity of the part shown as “dense” in FIG. Even when the outer cylinder 9 rotates, cutting waste, chips and the like stay stagnant between the adjacent magnets 4 and 4 and are not conveyed to the top of the rotating drum 3. Therefore, there is a problem that separation and recovery may not be possible.

  Therefore, in the rotating drum type magnetic separation device according to the present embodiment, a linear protrusion is provided on the outer peripheral surface of the outer cylinder 9 of the rotating drum 3. FIG. 3 is a schematic diagram showing the configuration of the protruding portion of the outer cylinder 9 of the rotary drum 3 according to the embodiment of the present invention. FIG. 3A is a perspective view showing a configuration of the protrusion 31 of the outer cylinder 9 of the rotary drum 3 according to the embodiment of the present invention, and FIG. 3B is according to the embodiment of the present invention. 3 is a partial cross-sectional view showing a configuration of a protrusion 31 of an outer cylinder 9 of a rotating drum 3. FIG.

  As shown in FIG. 3A, the protrusion 31 is formed on the outer peripheral surface of the outer cylinder 9 of the rotary drum 3 in a straight line parallel to the rotation axis of the outer cylinder 9. Actually, the linear protrusion 31 is formed by continuously forming the protrusion shown in FIG. 3B from one end to the other end by laser processing or the like. Of course, it is preferable that the height h of the protrusion 31 is sufficiently smaller than the diameter of the outer cylinder 9 and does not damage the surface of the squeeze roller 6. By forming the linear protrusion 31, sludge-like cutting waste, chips, etc. that cannot be conveyed due to stagnating in a portion where the magnetic adhesion force is larger than the frictional force are reliably generated by the protrusion 31. It can be conveyed to the top of the rotating drum 3.

  In FIG. 3, only one linear protrusion 31 is provided, but the present invention is not limited to this. FIG. 4 is a schematic cross-sectional view on a plane orthogonal to the rotation axis of the rotating drum 3, showing another configuration of the protrusion 31 of the outer cylinder 9 of the rotating drum 3 according to the embodiment of the present invention.

  4A, one linear protrusion 31 is provided on the outer peripheral surface of the outer cylinder 9 of the rotary drum 3, as in FIG. On the other hand, in FIG. 4B, two linear protrusions 31a and 31b are provided at positions symmetrical to each other about the rotation axis of the outer cylinder 9. Similarly, in FIG. 4C, four linear protrusions 31a, 31b, 31c, and 31d are provided at positions that are symmetric with respect to the rotation axis of the outer cylinder 9. However, when the number of the protrusions 31 is increased, the burden on the squeezing roller 6 is increased, and there is a possibility that the durability of the squeezing roller 6 is reduced. Therefore, it is preferable to limit the number of the linear protrusions 31 to four at the maximum.

  Further, the linear protrusion 31 may not be parallel to the rotation axis of the outer cylinder 9 but may have a predetermined inclination angle with respect to the rotation axis. FIG. 5 is a schematic diagram illustrating another configuration of the protrusion 31 of the outer cylinder 9 of the rotary drum 3 according to the embodiment of the present invention. 5 (a) and 5 (b) are perspective views showing another configuration of the protrusion 31 of the outer cylinder 9 of the rotary drum 3 according to the present embodiment, and FIG. 5 (c) is the present embodiment. It is a schematic diagram which shows the other structure of the projection part 31 of the outer cylinder 9 of the rotating drum 3 which concerns on a form.

  As shown in FIGS. 5A and 5B, the protrusion 31 a and the protrusion 31 b are linearly formed at positions that are symmetric about the rotation axis of the outer cylinder 9. Further, the protrusions 31 a and 31 b are inclined by an angle θ with respect to the rotation axis of the outer cylinder 9. Since the protrusions 31a and 31b are inclined at an angle θ, it is possible to reduce the frictional resistance when scraping scraps, chips and the like are scraped off by the scraper 7, and it is possible to improve the durability of the scraper 7. .

  Note that the angle θ formed by the protrusions 31a and 31b and the rotation axis of the outer cylinder 9 is preferably as small as possible, and more preferably between 1 degree and 5 degrees. This is because if the angle θ is too large, the possibility of spilling sludge-like cutting waste, chips, etc. during conveyance by rotation of the outer cylinder 9 increases.

  Further, the protrusion 31 is not limited to being formed in a straight line. FIG. 6 is a schematic diagram showing another configuration of the protrusion 31 of the outer cylinder 9 of the rotary drum 3 according to the embodiment of the present invention. 6A, the protrusion 31 of the outer cylinder 9 of the rotary drum 3 according to the present embodiment is formed in a V shape. By forming it in a V shape in this way, the possibility of spilling sludge-like cutting waste, chips, etc. during conveyance by rotation of the outer cylinder 9 is reduced.

  Moreover, in FIG.6 (b), the projection part 31 of the outer cylinder 9 of the rotating drum 3 which concerns on this Embodiment is formed in the zigzag shape. The zigzag shape as described above also reduces the possibility of spilling sludge-like cutting waste, chips, etc. during conveyance by rotation of the outer cylinder 9.

  As described above, according to the present embodiment, the magnetic force generated by the magnets 4, 4,... Generated on the outer peripheral surface of the outer cylinder 9 is larger than the frictional force of the outer peripheral surface of the outer cylinder 9. Even in this case, cutting swarf, chips and the like that are stagnating in the course of transport to the top of the rotating drum 3 can be transported to the top of the rotating drum 3 by the protrusions 31. Therefore, even if it is a post-process of cutting, it becomes possible to collect | recover cutting waste, chips, etc. reliably.

  In addition, various modifications such as a change in the arrangement of the protrusions 31 and a change in the formation method of the protrusions 31 can be made without departing from the spirit of the present invention. .

2 Liquid reservoir 3 Rotating drum 4 Magnet 5 Inner cylinder 6 Drawing roller 9 Outer cylinder 31, 31a, 31b, 31c, 31d Projection

Claims (5)

In the rotating drum used in the rotating drum type magnetic separation device, in which an inner cylinder in which a plurality of magnets are arranged is fixed, and an outer cylinder made of a nonmagnetic material rotates around the fixed inner cylinder.
A rotating drum comprising one or a plurality of protrusions continuous from one end side to the other end side on an outer peripheral surface of the outer cylinder.   The rotating drum according to claim 1, wherein the protrusion is formed in a straight line parallel to the rotation axis of the outer cylinder.   The rotating drum according to claim 1, wherein the protrusion is formed to form a predetermined angle with respect to a rotation axis of the outer cylinder.   4. The rotary drum according to claim 1, wherein the protrusions are formed at positions that are symmetrical with each other about the rotation axis of the outer cylinder. 5.   A rotary drum type magnetic separation device comprising the rotary drum according to any one of claims 1 to 4.

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