JP2018149519A - Magnetic separation processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic separation processing device which enables sludge to be separated unfailingly even when a large amount of sludge is contained in process liquid.SOLUTION: A magnetic separation processing device 100 includes: a process liquid storage part 18 which stores process liquid in which sludge made of a magnetic material is mixed; a rotation drum 20 which is housed in the process liquid storage part 18, formed with multiple recessed parts located in at least a part of an outer peripheral surface, and made of a non-magnetic material; a motor 30 which rotates the rotation drum 20; multiple magnets 40 disposed along an inner peripheral surface of the rotation drum 20; a squeezing roller 50 which rotates while being brought into contact with the outer peripheral surface of the rotation drum 20; and a scraper 60 which is brought into contact with the outer peripheral surface of the rotation drum 20 at a position at a downstream side of a position where the squeezing roller 50 is arranged.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a magnetic separation processing apparatus.

  When performing cutting or grinding on a workpiece, a treatment liquid is often used for the purpose of improving the lubricity between the workpiece and the processing tool and for frictional heat cooling between the workpiece and the processing tool. Since such a treatment liquid is expensive, it is repeatedly used.

  In such a treatment liquid, work cutting waste and grinding waste (hereinafter, cutting waste and grinding waste are sometimes referred to as sludge) are mixed. Therefore, in order to repeatedly use the treatment liquid, these sludges must be used. It is necessary to separate from the processing solution. In the case where the sludge is a magnetic material, a magnetic separation processing apparatus for performing a separation process between the sludge and the processing liquid is known, for example, as disclosed in Patent Document 1.

JP 2000-79353 A

  In the magnetic separation processing apparatus disclosed in Patent Document 1, sludge in the processing liquid can be appropriately separated. However, as the amount of sludge in the processing liquid increases, the sludge adhering to the outer peripheral surface of the rotating drum becomes flocked, and cannot be slid out of the outer peripheral surface of the rotating drum due to the magnetic attraction and gravity (see FIG. 6). (See the boxed area indicated by the arrow). In such a state, there is a problem that the sludge in the processing liquid is not transported to the position of the squeeze roller and the sludge cannot be separated from the processing liquid.

  Accordingly, the present invention has been made to solve the above-mentioned problems, and the object of the present invention is as follows. That is, an object of the present invention is to provide a magnetic separation processing apparatus capable of reliably separating sludge even when a large amount of sludge is contained in the processing liquid.

As a result of intensive studies by the inventor in order to solve the above-mentioned problems, the following configuration has been conceived.
That is, according to the present invention, a treatment liquid storage part for storing a treatment liquid in which sludge made of a magnetic material is mixed, and a plurality of recesses are formed in at least a part of the outer peripheral surface of the treatment liquid storage part. While being in contact with the outer peripheral surface of the rotating drum, a rotating drum made of a non-magnetic material, a drum driving unit that rotates the rotating drum, a plurality of magnets disposed along the inner peripheral surface of the rotating drum, A magnetic separation processing apparatus comprising: a rotating squeezing roller; and a scraper that contacts the outer peripheral surface of the rotating drum at a position downstream of the position where the squeezing roller is disposed.

  Thereby, since the contact area of sludge and a rotating drum can be increased, the frictional resistance made to act on sludge can be raised. For this reason, even if a large amount of sludge adheres to the outer peripheral surface of the rotating drum, the sludge can be transported to the scraper position against gravity, and the sludge can be reliably separated from the processing liquid. Become.

  Moreover, it is preferable that the said recessed part is formed in the whole range of the said outer peripheral surface of the said rotating drum. Furthermore, it is more preferable that the depth dimension of the recess is an average of 2 micrometers.

  By these, the separation process of the sludge in a process liquid can be performed more efficiently.

  Moreover, it is preferable that the said recessed part is formed by sandblasting.

  Thereby, the formation operation | work of the recessed part to the outer peripheral surface of a rotating drum can be performed efficiently.

  By adopting the configuration of the magnetic separation processing apparatus according to the present invention, the surface area of the outer peripheral surface of the rotating drum can be increased, so that even when a large amount of sludge is contained in the processing liquid, it is ensured. It becomes possible to separate sludge. In addition, since only the concave portion is formed on the outer peripheral surface of the rotating drum, deterioration due to friction with the scraper can be minimized.

It is an upstream perspective view of the magnetic separation processing apparatus in the present embodiment. It is a downstream perspective view of the magnetic separation processing apparatus in the present embodiment. It is a schematic internal structure figure of the magnetic separation processing apparatus in this embodiment. It is a comparison figure of the rotating drum in this embodiment, and the rotating drum in a prior art. It is usage condition explanatory drawing of the magnetic separation processing apparatus in this embodiment. It is a perspective view which shows the state in which the sludge slipped from the outer peripheral surface of the rotating drum in the magnetic separation processing apparatus of a prior art.

  As shown in FIGS. 1 to 3, the magnetic separation processing apparatus 100 according to the present embodiment includes a main body 10, a rotating drum 20, a motor 30 as a drum driving unit, and an inner peripheral surface of the rotating drum 20. A magnet 40, a squeezing roller 50, and a scraper 60 are provided.

  A treatment liquid inlet 12 is disposed on the side surface of the main body 10, and a sludge discharge part 14 is disposed so as to face the treatment liquid inlet 12. A treated liquid discharge port 16 is disposed on a side surface of the main body 10 which is orthogonal to the treatment liquid inlet 12 and the sludge discharge part 14 in a horizontal plane. The processing liquid taken into the main body portion 10 from the processing liquid inlet 12 is stored in a processing liquid storage portion 18 formed inside the main body portion 10. The processing liquid storage unit 18 is provided with a rotating drum 20 and a guide plate 19 for guiding the processing liquid to the rotating drum 20.

  The processing liquid inlet 12 has a cylindrical joint 12 </ b> A that protrudes outward from the main body 10. By connecting a treatment liquid intake pipe (not shown) to the joint 12A, the workpiece processing apparatus and the magnetic separation processing apparatus 100 can be connected.

  The sludge discharge unit 14 is disposed in a state where it is connected to the scraper 60 at a position downstream of the rotary drum 20. The sludge discharge part 14 in this embodiment is formed in a so-called inverted U-shaped cross-sectional shape having a flat bottom surface and side walls standing on both sides of the bottom surface. The sludge discharge part 14 forms a downward inclined surface that gradually extends downward as it separates from the scraper 60, and discharges sludge scraped off from the outer peripheral surface of the rotary drum 20 by the action of gravity. Although not shown, a sludge collection box may be disposed on the downstream side of the sludge discharge section 14.

  The processed liquid (processing liquid from which the sludge has been removed) from which the sludge has been separated from the processing liquid by the rotary drum 20 and the squeezing roller 50 is discharged from the processed liquid discharge port 16. The processed liquid discharged from the discharge port 16 is returned to the workpiece processing apparatus and reused as the processing liquid. Although not shown, a treated liquid recovery container may be disposed downstream of the discharge port 16. In this embodiment, as shown in FIG. 1 and FIG. 2, a discharge port 16 is provided on each of the opposing side surfaces of the main body 10, and the main body 10 (magnetic separation processing apparatus 100) is disposed at the position where the main body 10 is disposed. Accordingly, the discharge port 16 can be appropriately selected. As shown in FIG. 2, a shielding plate 17 is attached to the unused outlet 16.

  A treatment liquid storage part 18 is formed in the internal space of the main body 10 as a space for storing the treatment liquid flowing in from the treatment liquid inlet 12. A guide plate 19 for supplying the processing liquid stored in the processing liquid storage unit 18 to the rotary drum 20 is disposed in the processing liquid storage unit 18. The guide plate 19 also has a function as a partition that partitions the internal space of the main body 10 in the width direction crossing the flow direction of the processing liquid.

  The guide plate 19 in the present embodiment includes an inclined plate 19 </ b> A that forms an inclined surface that is inclined from the inner bottom surface of the processing liquid storage unit 18 toward the rotary drum 20, and an arcuate curved surface along the outer peripheral surface of the rotary drum 20. It is formed by combining the curved plate 19B which forms. The curved plate 19B is disposed in a state separated from the outer peripheral surface of the rotary drum 20 by a predetermined distance. As shown in FIG. 3, since both end positions of the curved plate 19B are at the same height position and are located outside the outer peripheral surface position of the rotary drum 20, the processing liquid squeezed by the squeezing roller 50 is curved. It will flow down to the plate 19B.

  The rotary drum 20 is formed in a cylindrical body made of a nonmagnetic material. Here, the rotating drum 20 was formed of SUS304. In the present embodiment, the rotating drum 20 performs a sandblasting process on the outer peripheral surface to form fine concave portions (not shown) on the entire outer peripheral surface of the rotating drum 20. In the present embodiment, sandblasting using sand having a particle size of 80 is performed, and concave portions having an average depth (average diameter size) of 2 micrometers are formed on the outer peripheral surface of the rotary drum 20. In the present embodiment, the sandblasting process is performed on the entire outer peripheral surface of the rotating drum 20. However, the outer peripheral surface of the rotating drum 20 is appropriately masked so that at least a part of the outer peripheral surface of the rotating drum 20 is fine. You may make it form a recessed part.

  In this way, the rotating drum 20 (see FIG. 4) in which fine concave portions are formed on the outer peripheral surface is more peripheral than the rotating drum 20 (see FIG. 4) in which the outer peripheral surface is formed on a smooth surface as in the prior art. The feature is that the surface is roughened. Such a rotating drum 20 is spanned so as to be rotatable in the width direction across the flow direction of the processing liquid at an upper position of the processing liquid storage section 18 (a position separated from the inner bottom surface of the processing liquid storage section 18). . An output shaft of a motor 30 that is a drum driving unit is directly or indirectly connected to the rotating drum 20, and rotates along the flow direction of the processing liquid by a driving force supplied from the motor 30.

  As shown in FIG. 3, a plurality of magnets 40 are fixed in the internal space of the rotating drum 20 along the inner peripheral surface of the rotating drum 20. Here, the poles of the magnet 40 facing the inner peripheral surface of the rotary drum 20 are arranged in an arc shape so that N poles and S poles alternate from the upstream side toward the downstream side. In the present embodiment, the range from the position immediately before the scraper 60 to the vicinity of the downstream end of the curved plate 19B is the magnet non-arranged portion 42. As a result, the sludge scraped off from the outer peripheral surface of the rotary drum 20 by the scraper 60 is discharged to the sludge discharge section 14 by being pushed out by the action of gravity and the sludge conveyed one after another.

  A squeezing roller 50 is disposed at a position upstream of the apex position of the rotary drum 20 and at a position downstream of the upstream end position of the curved plate 19B. The squeezing roller 50 is preferably formed of a material such as oil-resistant rubber having moderate elasticity. The squeezing roller 50 is disposed in a state where the rotation axis of the squeezing roller 50 is parallel to the rotation axis of the rotating drum 20 so as to follow the rotation of the rotating drum 20 while being in contact with the outer peripheral surface of the rotating drum 20. The outer peripheral surface of the squeezing roller 50 may be a smooth surface or an uneven surface.

  In the present embodiment, a squeezing roller abutting force adjusting unit 52 for adjusting the abutting force of the squeezing roller 50 against the rotary drum 20 is provided. The squeezing roller abutting force adjusting unit 52 can adjust the urging force of urging means (not shown) that abuts the squeezing roller 50 against the rotary drum 20 by rotating the adjusting knob 52A. By disposing the squeezing roller contact force adjusting unit 52, the contact force (pressing force) of the squeezing roller 50 against the rotating drum 20 can be adjusted according to the size of sludge mixed with the processing liquid, An efficient sludge separation process can be performed.

  The scraper 60 is formed to have the same width as the width of the rotary drum 20 by SUS304 like the rotary drum 20. The scraper 60 is disposed in a tangential direction with respect to the outer peripheral surface of the rotary drum 20, but the tip portion on the rotary drum 20 side is bent in a direction to bite into the rotary drum 20, and this tip portion is the rotary drum 20. It is arrange | positioned so that it may contact | abut to the outer peripheral surface. A downstream end portion of the scraper 60 communicates with the sludge discharge portion 14. The scraper 60 may be formed of a nonmagnetic material, and the material of the scraper 60 is not limited to the SUS304 material.

  The magnetic separation processing apparatus 100 in this embodiment has the above configuration. Then, the process at the time of isolate | separating sludge from the process liquid which the sludge which consists of a magnetic body using the magnetic separation processing apparatus 100 of this embodiment is mixing is demonstrated.

  Sludge generated during machining of the workpiece is mixed with the lubricating and cooling machining fluid used during machining of the workpiece made of a magnetic material by a workpiece machining apparatus (not shown) and discharged to the outside of the workpiece machining apparatus. The processing liquid mixed with such sludge is stored in the processing liquid storage unit 18 as a processing liquid through a processing liquid intake pipe that connects the workpiece processing apparatus and the processing liquid inlet 12 of the magnetic separation processing apparatus 100. . The processing liquid stored in the processing liquid storage unit 18 approaches the outer peripheral surface of the rotary drum 20 as the liquid level rises along the guide plate 19. When a required amount of processing liquid is stored in the processing liquid storage unit 18, the processing liquid comes into contact with the outer peripheral surface of the rotary drum 20.

  The rotating drum 20 is rotated by the motor 30 along the flow direction of the processing liquid (in the clockwise direction of the arrow A in FIG. 3), and the inner space of the rotating drum 20 is in the inner space of the rotating drum 20. A plurality of magnets 40 are arranged along the surface in a state where an alternating magnetic field is formed. That is, the sludge contained in the processing liquid in contact with the outer peripheral surface of the rotating drum 20 is attached to the outer peripheral surface of the rotating drum 20 and is sequentially conveyed in the rotating direction of the rotating drum 20. In the present embodiment, fine concave portions having an average size of 2 micrometers are formed on the outer peripheral surface of the rotating drum 20, so even if the amount of sludge contained in the processing liquid is large, the outer peripheral surface of the rotating drum 20. Therefore, the sludge does not slip and the sludge does not stay in the treatment liquid storage unit 18. That is, the sludge contained in the processing liquid can be transported in the rotational direction in a state where the sludge is reliably adhered to the outer peripheral surface of the rotary drum 20.

  The sludge conveyed by the rotating drum 20 is squeezed by the squeezing roller 50 disposed at a position upstream of the apex position of the rotating drum 20. The processing liquid, which is the liquid portion squeezed by the squeezing roller 50, flows down along the outer peripheral surface of the rotary drum 20 and falls onto the curved plate 19 </ b> B disposed below the rotary drum 20. The processing liquid and the processing liquid are mixed on the upper surface of the curved plate 19B, but since the magnet 40 is disposed in the required upstream side of the curved plate 19B, the sludge is adsorbed by the magnet 40 in this portion. It will be. In the mixed liquid of the processing liquid and the processing liquid stored on the upper surface of the curved plate 19B, only the component of the processing liquid flows from the downstream end of the curved plate 19B.

  The machining fluid that has overflowed from the downstream end of the curved plate 19 </ b> B is discharged from the magnetic separation processing apparatus 100 through the discharge port 16 disposed in the main body 10. If the discharge port 16 and the workpiece machining apparatus are communicated with each other, the machining fluid from which the sludge has been removed can be directly returned to the workpiece machining apparatus and reused.

  The sludge whose liquid content has been squeezed by the squeezing roller 50 is disposed on the outer peripheral surface of the rotating drum 20 by a scraper 60 disposed in a state of being in contact with the outer peripheral surface of the rotating drum 20 at a position downstream of the top position of the rotating drum 20 Is scraped off. The sludge scraped off by the scraper 60 is discharged from the sludge discharge unit 14 from the magnetic separation processing apparatus 100. Since the sludge discharge part 14 is formed in the shape of a slide, the sludge is pushed out by the action of gravity and sludge conveyed one after another and collected in a sludge collection container or the like.

  According to the configuration of the magnetic separation processing apparatus 100 in the embodiment described above, even when a large amount of sludge is contained in the processing liquid, the sludge is reliably attached to the outer peripheral surface of the rotating drum 20 by a magnetic force. In this state, it can be conveyed to the position of the squeeze roller 50 (see FIG. 5). As described above, since the sludge in the processing liquid is sequentially conveyed to the position of the squeezing roller 50, it is possible to provide the magnetic separation processing apparatus 100 capable of reliably separating the sludge contained in the processing liquid. it can.

  In the present embodiment, a cylindrical joint 12A is provided at the processing liquid inlet 12, and the workpiece processing apparatus and the magnetic separation processing apparatus 100 are connected by connecting a processing liquid intake pipe to the joint 12A. However, it is not limited to this form. For example, the processing liquid mixed with the sludge discharged from the workpiece processing apparatus may employ another supply means represented by a ridge instead of the processing liquid intake pipe. In this case, the treatment liquid inlet 12 may be a simple through hole formed on the outer surface of the main body 10. Further, the treatment liquid inlet 12 can be disposed on the upper surface of the main body 10.

  Further, although the sludge discharge part 14 is disposed at a position facing the processing liquid inlet 12, an arrangement in which the sludge discharge part 14 is orthogonal to the processing liquid inlet 12 in a horizontal plane may be employed.

  Further, in the present embodiment, the treated liquid discharge ports 16 are arranged at two locations on the opposite side surfaces of the main body 10 and one discharge port 16 is shielded by the shielding plate 17. The arrangement of the shielding plate 17 can be omitted by providing only one outlet 16. Further, the discharge port 16 can be disposed on the bottom surface of the main body 10.

  In this embodiment, the inclined plate 19A and the curved plate 19B are integrally formed with the guide plate 19. However, the inclined plate 19A is a vertical plate that stands upright on the inner bottom surface of the processing liquid storage unit 18. You can also. Moreover, the form of the guide plate 19 which replaced the curved plate 19B with the saucer formed in U shape or the inverted L shape where the downstream side of a flat plate stands can also be employ | adopted.

  Further, in the present embodiment, fine recesses having an average diameter of 2 micrometers are formed by sandblasting at least a part of the outer peripheral surface of the rotary drum 20. May be other than 2 micrometers. The average diameter of the fine recesses can be changed as appropriate by changing the sandblasting conditions.

  In the present embodiment, the fine recesses on the outer peripheral surface of the rotary drum 20 are formed by sandblasting, but may be formed using a known roughening treatment technique typified by electrolytic treatment or sandpaper treatment. In short, it is only necessary that the surface area can be increased by forming the fine recesses on at least a part of the outer peripheral surface of the rotating drum 20 without forming a protruding portion from the outer peripheral surface of the rotating drum 20.

  Thus, since there is no protrusion from the outer peripheral surface of the rotating drum 20, even when the scraper 60 is in contact with the outer peripheral surface of the rotating drum 20, the wear on the outer peripheral surface of the rotating drum 20 is minimized. Therefore, it is advantageous in that the initial performance can be maintained over a long period of time.

  In addition to the modifications described above, it is possible to adopt a form in which the modifications described in the embodiments are appropriately combined.

10 body part,
12 treatment liquid inlet, 12A joint,
14 sludge discharge part, 16 discharge port, 17 shielding plate, 18 treatment liquid storage part,
19 guide plate, 19A inclined plate, 19B curved plate,
20 rotating drums, 30 motors, 40 magnets, 42 magnets not installed,
50 squeezing roller, 52 squeezing roller contact force adjusting section, 52A adjusting knob,
60 scrapers,
100 Magnetic separation processor

Claims (4)

A treatment liquid storage section for storing a treatment liquid in which sludge made of a magnetic material is mixed;
A rotating drum made of a non-magnetic material that is housed in the processing liquid reservoir and has a plurality of recesses formed on at least a portion of the outer peripheral surface;
A drum drive for rotating the rotating drum;
A plurality of magnets disposed along the inner peripheral surface of the rotating drum;
A squeezing roller that rotates while contacting the outer peripheral surface of the rotating drum;
And a scraper that contacts the outer peripheral surface of the rotating drum at a position downstream of the position where the squeezing roller is disposed.   The magnetic separation processing apparatus according to claim 1, wherein the recess is formed in the entire range of the outer peripheral surface of the rotating drum.   3. The magnetic separation processing apparatus according to claim 1, wherein the depth dimension of the recess is an average of 2 micrometers.   The magnetic separation processing apparatus according to claim 1, wherein the concave portion is formed by sand blasting.