KR101243656B1 - Squeezing roller and rotary drum-type magnetic separator - Google Patents

Abstract

Rotating drum type magnetic separation device and the device capable of sufficiently squeezing the liquid contained in the sludge without being stuck in the squeegee roller, even if the sludge has a shape that is easily embedded in the squeegee roller. It provides a squeegee roller used in the.

An outer cylinder 9 in which an inner cylinder 5 in which a plurality of magnets 4, 4,...... Are arranged is built, and a fixed inner cylinder 5 is formed of a non-magnetic material. The squeegee roller 6 which rotates about the axis substantially parallel to the rotating axis of the rotating drum 3 which is in contact with the rotating drum 3 which is made to rotate is provided. An elastic body is arrange | positioned at the surface which abuts the rotating drum 3 of the squeegee roller 6, The said elastic body is an uncrosslinked polyurethane material which has polyester polyol as a main component. Both ends of the squeegee roller 6 are provided with a suppressing member which suppresses elastic deformation.

Description

Squeezing roller and rotary drum-type magnetic separator

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating drum type magnetic separation device for recovering fine sludge contained in a coolant liquid and a squeegee roller used in the device.

In cutting, grinding, and the like of metal materials, in particular, magnetic materials such as steel materials, cutting residues, cutting powders, etc. discharged together with the coolant liquid are collected separately from the liquid fractions. Since cutting debris and cutting powder have various shapes, various magnetic separation (collection) devices have been developed from the viewpoint of recovery efficiency.

For example, since the cutting powder called sludge is powdery, it is easy to aggregate and contain liquid powder easily. Therefore, since it is difficult to separate and recover, the magnetic separation device is required for a device that is excellent in liquid-splitting property of fine sludge.

As shown in Patent Literature 1, in the conventional rotary drum type magnetic separation device, a liquid storage unit 2 for storing coolant liquid is provided in a box-shaped main body 1. The rotating drum 3 is axially supported substantially horizontally in the vicinity of the central portion of the main body 1 so as to divide the liquid storage part 2 into two parts. The rotating drum 3 forms a cylindrical body made of a nonmagnetic material such as stainless steel, and arranges a plurality of magnets 4, 4, ... in a predetermined arrangement on an outer circumferential surface thereof. The inner cylinder 5 is fixed to the same shaft inside the outer cylinder. The polarities of the plurality of magnets 4, 4,... Are a predetermined magnetic flux near the outer circumferential surface of the rotating drum 3 so that the cutting residue, cutting powder, etc. contained in the coolant liquid can be self-fixed. It is arranged to generate.

In patent document 1, it corresponds to the part equivalent to about three quarters from the part immersed in the liquid storage part 2 of the rotating drum 3 to the top part, ie, the outer periphery of the rotating drum 3. A plurality of magnets 4, 4,... Are arranged in the inner cylinder 5. The magnets 4, 4,... Are not arranged in the inner cylinder 5 in the portion corresponding to approximately one quarter of the remainder, and are configured such that magnetic force does not act.

The sludge adsorbed to the outer circumferential surface of the rotating drum 3 at the bottom of the liquid storage part 2 by the magnetic force of the magnets 4, 4,..., Is rotated with the rotation of the rotating drum 3. It is conveyed to the top part of and the suction force by the magnets 4, 4, ... is lost at the time when the top part passes, and the sludge is scraped off by the scraper 7 which contacts the rotating drum 3, and it collect | recovers. 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 is provided, and abuts against the outer circumferential surface of the rotating drum 3 by a predetermined pressure. As the adsorbed sludge passes between the rotating drum 3 and the squeegee roller 6, the liquid content contained in the sludge is squeezed, and only the cutting residue, the cutting powder, etc. are separated from the magnetic force.

[Patent Document 1] Japanese Unexamined Patent Publication No. 2000-079353

[Disclosure of the Invention]

[Problems to be solved by the invention]

However, in Patent Literature 1, when the scraper 7 scrapes off the sludge, there is a problem that the liquid on the surface of the rotating drum 3 is scraped off together with the sludge, and the recovered sludge becomes a state containing the liquid. . In particular, at both ends of the squeegeeing roller 6, the squeezing efficiency tends to be relatively low, and the liquid component tends to be in a state in which the liquid is not sufficiently squeezed. Therefore, in the vicinity of the scraper 7, there was also a problem that liquid residue remaining at both ends is absorbed by the sludge again, resulting in insufficient liquid separation of the separated sludge.

Moreover, the sludge shape is also various by the difference of the grinding processing method, the difference of the to-be-grinded material, the difference of a combination, etc. For example, the sludge shape varies in curl shape, needle shape, powder shape, and the like, and the sludge also varies from several millimeters to several micrometers. And, in the case of the shape which is easy to get stuck in the squeegee roller 6, the ring-shaped sludge ring is formed in the squeegee roller 6 by several times of use, and the frequency | count of maintenance, such as replacement of the squeegee roller 6, increases. There was a problem.

In addition, sludge generated in recent precision grinding processing, such as traverse cut processing, shaving processing, honing processing, lapping processing, etc., tends to be ultrafine particles. In addition, an oil-based coolant liquid having a higher viscosity than water is often used, and it is increasingly difficult to reliably separate the coolant liquid from the ultrafine atomized sludge.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a rotary drum type magnetic separation device capable of separating sludge for a long time without getting stuck in the squeegee roller even if the shape of the sludge is easily embedded in the squeegee roller, and the device An object of the present invention is to provide a squeegee roller for use in the present invention.

In addition, the present invention provides a rotary drum type magnetic separation device capable of squeezing the liquid contained in the sludge sufficiently, even in the case of ultrafine sludge, and the squeegee roller used in the device. For the purpose of

[Means for solving the problem]

In order to achieve the above object, the squeegeeing roller according to the first aspect of the invention has a built-in inner cylinder in which a plurality of magnets are disposed, and a rotating drum in which an outer cylinder made of a nonmagnetic material rotates around the fixed inner cylinder. A squeegee roller for use in a rotating drum type magnetic separation device, which is rotated about an axis substantially parallel to a rotating axis of a rotating drum, wherein an elastic body is disposed on a surface in contact with the rotating drum. And a non-crosslinked polyurethane material containing polyester polyol as a main component.

In the first aspect of the present invention, an inner cylinder in which a plurality of magnets are disposed is built, and a rotating drum in which an outer cylinder made of a nonmagnetic material is rotated around the fixed inner cylinder is centered on an axis approximately parallel to the rotating axis of the rotating drum. And squeegee rollers are installed to rotate and contact each other. An elastic body is arrange | positioned at the surface which contact | connects a rotating drum, This elastic body consists of the uncrosslinked polyurethane material which has polyester polyol as a main component. In the case of using a normal polyurethane material, hydrolysis occurred on the surface of the elastic body due to the liquid powder contained in the sludge, and thus could not withstand use as a squeegee roller. By using an uncrosslinked polyurethane material, the occurrence of hydrolysis can be avoided beforehand, and the durability as a squeegee roller can be ensured.

Moreover, due to the height of hardness, which is peculiar to polyurethane, the elongation is small but the bursting strength is high. Therefore, even when the sludge has a shape that is easy to get stuck such as a needle shape, sludge is formed on the squeezing roller. Hard to get stuck Therefore, even in the case of fine needle-like sludge, for example, the sludge can be prevented from getting stuck in the squeegee roller, and stable liquid squeegeeing can be performed for a long time.

Moreover, the squeegeeing roller which concerns on 2nd invention is equipped with the suppression member which suppresses the movement of the said elastic body to the axial direction in the both ends in 1st invention, It is characterized by the above-mentioned.

In 2nd invention, the both ends are provided with the suppression member which suppresses the movement of an elastic body to the axial direction. When the rotating drum and the squeegee roller are in contact with each other, an escape portion toward both end portions is formed in the elastic body. Therefore, a restraining member is provided to suppress the movement of the elastic body from both ends in the axial direction so that the escape portion does not occur. As a result, no escape portion occurs, and liquid leakage at both ends does not occur. Therefore, the sludge can be sufficiently liquid-liquid, and the sludge can be easily separated and recovered.

Next, in order to achieve the above object, the rotary drum type magnetic separation device according to the third aspect of the invention includes the squeegee roller described above.

In 3rd invention, the squeegee roller which concerns on 1st invention and / or 2nd invention is provided, and by using an uncrosslinked polyurethane material as a material of an elastic body, generation | occurrence | production of hydrolysis can be avoided beforehand, Durability as a quenching roller can be ensured. Moreover, due to the height of hardness, which is characteristic of polyurethane materials, the elongation rate is small but the bursting strength is high, so even when the sludge is in a shape that is easy to get stuck such as a needle shape, the sludge is hardly embedded in the squeegee roller. . Therefore, even in the case of fine needle-like sludge, for example, the sludge can be prevented from getting stuck in the squeegee roller, and stable liquid squeegeeing can be performed for a long time.

The third embodiment of the rotary drum magnetic separator according to the present invention is characterized in that the circumferential surface of the rotary drum is a smooth mirror surface.

In the fourth aspect of the invention, by processing the circumferential surface of the rotating drum to be a smooth mirror surface, it becomes difficult to maintain an upright state on the surface of the rotating drum even when the sludge is in the form of a needle-like shape. Therefore, even in the case of needle-like sludge, for example, it is possible to suppress the sludge from getting stuck in the squeegee roller, so that stable liquid squeezing can be performed for a long time.

In the rotary drum magnetic separator according to the fifth aspect of the invention, in the third or fourth aspect of the invention, a plurality of rotational drums each have the same polarity in a ring shape at approximately three quarters of the inner cylinder circumferential surface. The magnet rows are arranged, and the polarities of the plurality of magnet rows arranged adjacent to each other in the axial direction are different from each other, and in the vicinity of the portion in contact with the squeegee roller, another plurality having the polarity opposite to the plurality of the magnet rows. Magnets are arranged at least in line in the axial direction.

In the fifth aspect of the invention, a plurality of magnet rows having the same polarity in a ring shape are arranged in approximately three quarters of the inner cylinder circumferential surface of the rotating drum, and the polarities of the plurality of magnet rows arranged adjacent in the axial direction are mutually different. It is different. On the other hand, in the vicinity of the portion in contact with the squeegee roller, another magnet having a polarity opposite to the polarity of the magnet string described above is arranged at least in line in the axial direction. Needle-shaped sludge is likely to be erected in the normal direction of the circumferential surface of the rotating drum at the gap portion where the magnets having different polarities face each other, and is likely to get stuck in the elastic body of the squeegee roller. By arranging at least one line of magnets having opposite polarities in the vicinity of the portion in contact with the squeezing roller, the needle-shaped sludge erected in the normal direction of the circumferential surface of the rotating drum at the gap portion along the circumferential surface It becomes self-fixing and the possibility of being stuck in the elastic body of a squeegee roller becomes low. Therefore, even if the sludge shape is a shape that is easy to get stuck in a squeegee roller such as a needle shape, a ring-shaped sludge ring is not formed on the squeegee roller by plural times of use, and thus it is possible to function as a rotating drum type magnetic separator that is stable for a long time. Done.

In the rotary drum magnetic separator according to the sixth invention, in the third or fourth invention, a plurality of the rotating drums have the same polarity in the axial direction at approximately three quarters of the inner cylinder circumferential surface. A plurality of magnet rows are arranged, and the polarities of the plurality of magnet rows arranged adjacent to each other in the circumferential direction are different from each other.

In the sixth invention, a plurality of magnet rows having the same polarity in the axial direction are arranged in approximately three quarters of the inner cylinder circumferential surface of the rotating drum, and the polarities of the plurality of magnet rows disposed adjacent to each other in the circumferential direction Different from each other. Since magnets having different polarities are arranged successively in the direction in which the rotating drum rotates, the needle-shaped sludge self-fixes along the circumferential surface of the rotating drum, and the possibility of getting stuck in the elastic body of the squeegee roller is lowered. Therefore, even if the sludge shape is a shape that is easy to get stuck in a squeegee roller such as a needle shape, a ring-shaped sludge ring is not formed on the squeegee roller by plural times of use, and thus it is possible to function as a rotating drum type magnetic separator that is stable for a long time. Done.

[Effects of the Invention]

According to the first aspect of the invention, by using an uncrosslinked polyurethane material, the occurrence of hydrolysis can be avoided beforehand, and the durability as a squeegee roller can be ensured. Moreover, due to the height of hardness, which is characteristic of polyurethane materials, the elongation rate is small but the bursting strength is high, so even when the sludge is in a shape that is easy to get stuck such as a needle shape, the sludge is hardly embedded in the squeegee roller. . Therefore, even in the case of fine needle-like sludge, for example, the sludge can be prevented from getting stuck in the squeegee roller, and stable liquid squeegeeing can be performed for a long time.

According to the second aspect of the present invention, when the rotating drum and the squeegee roller are in contact with each other, an escape portion toward both end portions is formed in the elastic body. Therefore, a suppression member for suppressing movement of the elastic body from both ends in the axial direction so as not to cause this escape portion is provided. By the provision, no escape portion is generated, and liquid leakage at both ends does not occur. Therefore, the sludge can be sufficiently liquid-liquid, and the sludge can be easily separated and recovered.

According to the third aspect of the present invention, by using an uncrosslinked polyurethane material, the occurrence of hydrolysis can be avoided beforehand, and durability as a squeegee roller can be ensured. Moreover, due to the height of hardness, which is characteristic of polyurethane materials, the elongation rate is small but the bursting strength is high, so even when the sludge is in a shape that is easy to get stuck such as a needle shape, the sludge is hardly embedded in the squeegee roller. . Therefore, even in the case of fine needle-like sludge, for example, the sludge can be prevented from getting stuck in the squeegee roller, and stable liquid squeegeeing can be performed for a long time.

According to the fourth aspect of the invention, even when the sludge is in the form of a needle or the like, it is difficult to maintain an upright state on the surface of the rotating drum. Even if the sludge is a needle-shaped sludge, for example, the sludge is a squeegee roller. It can be suppressed from getting stuck, and it becomes possible to perform stable liquid squeegeeing for a long time.

According to the fifth aspect of the present invention, the needle-like shape, which is erected in the normal direction of the circumferential surface of the rotating drum at the gap portion, by arranging at least one other row of magnets having opposite polarities in the vicinity of the portion in contact with the squeezing roller. The sludge adheres along the circumferential surface, which lowers the possibility of getting stuck in the elastic body of the squeegee roller. Therefore, even if the sludge shape is a shape that is easy to get stuck in a squeegee roller such as a needle shape, a ring-shaped sludge ring is not formed on the squeegee roller by plural times of use, and thus it is possible to function as a rotating drum type magnetic separator that is stable for a long time. Done.

According to the sixth aspect of the invention, since magnets having different polarities are continuously arranged in the direction in which the rotating drum is rotated, the needle-shaped sludge self-fixes along the circumferential surface of the rotating drum and is likely to get stuck in the elastic body of the squeezing roller. Lowers. Therefore, even if the sludge shape is a shape that is easy to get stuck in a squeegee roller such as a needle shape, a ring-shaped sludge ring is not formed on the squeegee roller by plural times of use, and thus it is possible to function as a rotating drum type magnetic separator that is stable for a long time. Done.

1 is a cross-sectional view in a plane perpendicular to the axis of rotation of a rotating drum, showing the configuration of the rotating drum magnetic separator according to the first embodiment of the present invention.

Fig. 2 is a rear view showing a liquid leak state on the surface of a squeegeeing roller in a conventional rotary drum type magnetic separation device.

3 is a cross-sectional view of a surface including a rotating shaft of a squeegeeing roller according to a second embodiment of the present invention.

Fig. 4 is a sectional view and a front view showing the polarity arrangement of the magnets of the rotating drum in the rotating drum magnetic separator according to the third embodiment of the present invention.

Fig. 5 is a sectional view and a front view showing the polarity arrangement of the magnets of the rotating drum in the rotating drum type magnetic separator according to the fourth embodiment of the present invention.

* Description of the sign *

2: liquid storage unit

3: rotating drum

4: magnet

5: inner tube

6: squeegee roller

8: elastic body

9: outer cylinder

10: side collar (inhibiting member)

11: shaft core collar (inhibiting member)

BEST MODE FOR CARRYING OUT THE INVENTION [

EMBODIMENT OF THE INVENTION Below, this invention is demonstrated in detail based on drawing which shows the Example.

(Example 1)

1 is a cross-sectional view in a plane perpendicular to the axis of rotation of a rotating drum, showing the configuration of the rotating drum magnetic separator according to the first embodiment of the present invention. As shown in FIG. 1, the rotary drum type magnetic separation apparatus which concerns on the present Example 1 is provided with the liquid storage part 2 which stores coolant liquid in the box-shaped main body 1. As shown in FIG. The rotating drum 3 is axially supported in the vicinity of the center of the main body 1 so that the liquid storage unit 2 can be divided into two parts in a substantially horizontal direction. The rotating drum 3 constitutes a cylindrical body made of nonmagnetic material such as stainless steel, and has an inner cylinder 9 having a plurality of magnets 4, 4,... It is fixed to the same axis inside). The polarities of the plurality of magnets 4, 4, ... are arranged to generate a predetermined magnetic flux in the vicinity of the outer circumferential surface of the rotating drum 3 so that cutting residues, cutting powder, and the like contained in the coolant liquid can be fixed. .

In FIG. 1, the inner cylinder 5 corresponding to a portion corresponding to approximately three quarters of the portion of the rotary drum 3 immersed in the liquid storage unit 2 to the top portion, that is, the outer circumference of the rotary drum 3. ), A plurality of magnets 4, 4, ... are arranged. The magnets 4, 4,... Are not arranged in the inner cylinder 5 in the portion corresponding to approximately one quarter of the remainder, and are configured such that magnetic force does not act.

The sludge adsorbed to the outer circumferential surface of the rotating drum 3 at the bottom of the liquid storage part 2 by the magnetic force of the magnets 4, 4,..., Is rotated with the rotation of the rotating drum 3. It is conveyed to the top part of and the suction force by the magnets 4, 4, ... at the time of passing through the top part is lost, and the sludge is scraped off by the scraper 7 which contacts the rotating drum 3, and it collect | recovers. 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 is provided, and abuts against the outer circumferential surface of the rotating drum 3 by a predetermined pressure. As the adsorbed sludge passes between the rotating drum 3 and the squeegee roller 6, the liquid content contained in the sludge is squeezed, and only the cutting residue, the cutting powder, etc. are separated from the magnetic force.

In the first embodiment, an uncrosslinked polyurethane material containing polyester polyol as a main component is used as the elastic body used for the contact surface with the rotating drum 3 of the squeezing roller 6. Conventionally, in the case of using a polyurethane material, the elastic body is easily damaged by hydrolysis by the liquid powder adhering to the surface, and thus it is not endurable to use. Therefore, the mainstream uses elastic bodies such as CR (chloroprene) rubber and NBR (nitrile) rubber. In the present invention, by using an uncrosslinked polyurethane material for the squeegeeing roller 6 of the magnetic separation device on the premise of contact with the liquid powder, it is possible to suppress the hydrolysis and to obtain an excellent effect that was difficult to obtain with conventional materials. Exert.

That is, although it is relatively hard, elongation is small, but since it has a strong tear strength, it has the property that a blade of a knife is hard to get stuck. Therefore, the fine needle-like sludge is hard to be embedded in the elastic body, and has a stable liquid squeegeeing effect for a long time.

Specifically, the rotary drum type magnetic separator was configured as follows. First, on the circumferential surface of the rotating drum 3 made of stainless steel, a ferrite structure having a thickness of 30 μm was formed on the entire surface by nitriding heat treatment under a condition maintained at a temperature of 530 ° C. and a nitrogen-containing atmosphere for 4 hours. And the required surface roughness. Moreover, the punching metal which perforated the small hole of 0.5 mm internal diameter by 1 mm interval was employ | adopted as the scraper 7 which makes the rotating drum 3 contact.

In the grinding apparatus, the experiment which collect | recovers ultra-fine sludge from the planetary coolant liquid which grind | polished SCr steel using the traverse cut machine using a CBN grindstone was performed. In this case, the cutting chips, cutting powder, etc. generated are relatively small.

In the squeegeeing roller 6 used for the rotary drum type magnetic separator of the first embodiment, polyurethane (PU) rubber, which is a hard rubber, is used as an elastic body. The main component was uncrosslinked polyester polyurethane, and had a hardness (JIS-A) 58, a breaking strength of 33 kg / cm, a tensile strength of 231 kg / m 2, and an elongation of 340%. For comparison, the squeegeeing roller 6 used in the conventional rotary drum type magnetic separation device includes NBR rubber (hardness 21, burst strength 6 kg / cm, tensile strength 36 kg / m 2, elongation rate 700%) as a soft rubber. ) Or CR-based rubber (hardness 61, burst strength 14 kg / cm, tensile strength 120 kg / m 2, elongation rate 300%) was used as the hard rubber.

The fraction of oil contained in the rotary drum type magnetic separator according to the first embodiment and the conventional rotary drum type magnetic separator included in sludge separated and recovered from the same amount of oil-based coolant liquid after cutting under the same conditions. ) Was measured for a plurality of operations. In the present Example 1, the fraction of oil was 14-15 weight% less than the case of using the NBR rubber which is a soft rubber, and 7-10 weight% less than the case of using the CR rubber which is a hard rubber.

In addition, in order to compare with the squeezing roller 6 used for the rotating drum type magnetic separation device according to the first embodiment, NBR rubber (hardness 60, burst strength) as the hard rubber other than the CR rubber described above. Polyurethane (PU) -based rubber (hardness 60, rupture strength 30kg / cm, tensile strength 315kg / m 2) having 20 kg / cm, tensile strength 156kg / m 2, elongation rate 400%), and a crosslinked urethane prepolymer as a main component And elongation rate 460%), the time-dependent change of the squeegee roller 6 was compared.

As a result of performing the operation with the same throughput per unit time, when CR-based rubber was used, the whole was whitened by the ultra fine sludge embedded in the surface of the elastic body of the squeegeeing roller 6 after two or three months, and the sludge deoiling ( The rate of violently decreased. When NBR-based rubber was used at the same time, the amount of ultra-fine sludge was less than that of CR-based rubber. However, the sludge deoiling rate was falling. On the other hand, in the case of using a polyurethane-based rubber, the amount of ultrafine sludge dipped less than in any case, but deterioration of the surface of the elastic body was observed by hydrolysis, and the deoiling rate of the sludge decreased. On the other hand, in the squeegeeing roller 6 according to the first embodiment, there was almost no sticking of the ultra fine sludge, no deterioration of the surface of the elastic body, and no particular change was observed in the deoiling rate of the sludge.

Next, the experiment which collect | recovers fine sludge from the aqueous coolant liquid which grind | polished SK3 steel using the traverse cut machine using WA grindstone as a grinding apparatus was performed. In this case, the amount of cutting chips, cutting powder, etc. generated is relatively large.

In the squeegeeing roller 6 used for the rotary drum type magnetic separator of the first embodiment, polyurethane (PU) rubber, which is a hard rubber similar to the above, is used as an elastic body. The main component was uncrosslinked polyester polyurethane, and had a hardness (JIS-A) 58, a breaking strength of 33 kg / cm, a tensile strength of 231 kg / m 2, and an elongation of 340%. The moisture content (weight%) contained in the sludge separated and recovered was compared with the case where the above-mentioned CR rubber (hardness 61, rupture strength 14 kg / cm, tensile strength 120 kg / m 2, elongation rate 300%), which is a hard rubber, was used. .

That is, after the rotary drum type magnetic separator and the conventional rotary drum type magnetic separator were cut under the same conditions, the sludge was separated and recovered from the same amount of aqueous coolant liquid. The water content (weight%) contained in the separated and recovered sludge was measured for a plurality of operations. As a result, in the present Example 1, moisture content was 1.0 to 1.2 weight% less than when using the CR type rubber which is hard rubber | gum.

Further, in the case where forced driving is performed to synchronize the rotation of the squeegeeing roller 6 and the rotation of the rotating drum 3, in the first embodiment, the moisture content is 1.4 compared with the case of using the CR rubber, which is a hard rubber. -1.6 weight% decreased.

As described above, according to the first embodiment, even when the ultra-fine sludge is recovered from the oil-based coolant liquid or even when the fine sludge is recovered from the aqueous coolant liquid, the deoiling (water) rate of the sludge can be improved as described above. In addition, from the sludge generated in the grinding by bite, the separation recovery rate of the ultra fine sludge generated in shaving, honing, lapping, ultra finishing, etc. can be greatly improved. Therefore, the amount of oil-based coolant discharged from industrial waste treatment can be reduced, and it is possible to effectively utilize the recovered and recovered metal as a recycling resource.

(Example 2)

Sectional drawing in the surface orthogonal to the rotation axis direction of the rotating drum which shows the structure of the rotating drum type magnetic separation device which concerns on Example 2 of this invention is the same as Example 1, and detailed description is attached | subjected with the same number as FIG. Omit. The rotary drum type magnetic separator according to the second embodiment is different from the first embodiment in that it includes a suppressing member that suppresses movement in the axial direction of the elastic body mounted on the squeegee roller 6 surface.

Fig. 2 is a rear view showing a liquid leakage state on the surface of the squeegee roller 6 in the conventional rotary drum type magnetic separation device. FIG. 2 (a) is a side view of the squeegeeing roller 6 and the rotating drum 3 viewed from the direction of the rotation axis in the conventional rotating drum type magnetic separation device, and FIG. 2 (b) is the conventional rotating drum type magnetic separation. The front view of the squeegee roller 6 and the rotating drum 3 in an apparatus is shown, respectively.

As shown in Fig. 2 (b), in the conventional rotary drum type magnetic separation device, the liquid leaking portions 21 are formed at both ends of the squeegee roller 6 at the contact surface between the squeegee roller 6 and the rotary drum 3. 21) occurs. The size of the liquid leaking portions 21 and 21 may include the surface roughness of the rotating drum 3, the hardness of the elastic body 8 of the squeezing roller 6, the pressing force of the squeezing roller 6, the rotational speed, and the coolant liquid. It varies depending on the kind and the like.

This is caused by pressing the squeegee roller 6 at the contact surface between the squeegee roller 6 and the rotary drum 3 so that both ends of the elastic body 8 of the squeegee roller 6 come out. Since the pressure is applied to both ends, it is considered that the pressing force of the squeegee roller 6 and the rotary drum 3 decreases at both ends, and the liquid component which is not fully squeezed out leaks. Therefore, in the present Example 2, as shown in FIG. 3, the suppressing member which suppresses the movement to the axial direction of the elastic body 8 attached to the squeegee roller 6 surface is provided.

3 is a cross-sectional view of a surface including a rotating shaft of the squeegeeing roller 6 according to the second embodiment of the present invention. In FIG.3 (a), the side collars 10 and 10 are fixed to the rotating shaft 12 of the squeegee roller 6 from an outer side as a suppression member. By sticking the side collars 10 and 10 so as to push each other from the outside of both ends, it is possible to prevent the both ends of the elastic body 8 from escaping to the outside and to prevent the squeegeeing roller 6 and the rotating drum 3 of both ends. The pressing force does not decrease, and liquid leakage can be suppressed.

However, the side collars 10 and 10 are fixed to the rotary shaft 12 of the squeegee roller 6, such that the squeegee roller 6 abuts against the rotary drum 3, so that the side collars 10 and 10 are opposite sides of the elastic body 8. If it is the structure which can pressurize suitably, it is not limited to plate shape as shown to Fig.3 (a). For example, when the material of the side collars 10 and 10 is a metal material, a hard resin material, etc., shape, such as an increase of required plate | board thickness and installation of a reinforcement rib, is not limited.

In addition, it is preferable that the outer diameter of the side collars 10 and 10 is smaller than the outer diameter of the squeegee roller 6. That is, by making the outer diameters of the side collars 10 and 10 smaller by the amount of deformation due to the contact with the rotating drum 3, the outer diameters of the side collars 10 and 10 are larger than the outer diameter of the elastic body 8 when abutting. It can be made small or equivalent, thereby avoiding damaging the surface of the rotating drum 3.

In addition, as the restraining member, as shown in FIG. 3 (b), the shaft collar 11 is formed at the portion corresponding to the liquid leaking portions 21, 21 inside the elastic body 8 of the squeegeeing roller 6. 11) may be incorporated. By doing in this way, it becomes thin at the both ends of the elastic body 8, and adhesiveness with the rotating drum 3 is not impaired. Therefore, even at both ends, sufficient liquid squeegeeing performance can be exhibited and liquid leakage can be prevented.

Here, it is preferable to minimize the outer diameter and the length of the axial direction of the axial center collars 11 and 11 to be incorporated so that the elastic force of the elastic body 8 may not be impaired. The outer diameter and the length in the axial direction of the shaft cores 11 and 11 are assumed to be the amount of deformation of the elastic body 8 when abuts against the rotating drum 3, and the liquid leaking portion assumed when the shaft cores 11 and 11 are not provided. In consideration of the width and the like of (21, 21), the minimum size is selected.

Of course, as shown in Fig. 3 (c), the side collars 10 and 10 are mounted as suppressing members, and the shaft center collars 11 and 11 are incorporated in the elastic body 8 of the squeegee 6. You may also do it. In this case, by reducing the outer diameters of the shaft core collars 11 and 11 and increasing the plate thickness of the side collars 10 and 10, the occurrence of the liquid leaking portions 21 and 21 can be more effectively prevented. It becomes possible.

Specifically, in the rotary drum type magnetic separation device having the same configuration as in Example 1, first, a 10% oil-based coolant liquid containing sludge of 20 µm to 1000 µm is used as the processing liquid, and a squeegee roller is used. Polyurethane (PU) rubber which is a hard rubber is used for the elastic body 8 of (6). The main component of the elastic body 8 was uncrosslinked polyester polyurethane, and was hardness (JIS-A) 60, burst strength 32 kg / cm, tensile strength 245 kg / m <2>, and elongation rate 360%.

The axial width [Delta] W of the liquid leaking parts 21 and 21 after performing the sludge separation recovery process from the oil-based coolant liquid by the predetermined operation was measured. In the conventional configuration, the width of the liquid leaking portions 21 and 21 was 22 mm, whereas when only the side collars 10 and 10 were provided, 20 mm and 21.5 mm were provided only the axial collars 11 and 11. When both were provided, it was confirmed that it was 19 mm, and the width | variety of the liquid leaking parts 21 and 21 was reduced compared with the conventional structure.

Moreover, the experiment which collect | recovers the fine sludge from the aqueous coolant liquid which ground the SK3 steel using the traverse cut machine using WA grindstone as a grinding apparatus was performed. In the squeezing roller 6 used for the rotary drum type magnetic separation device according to the second embodiment, polyurethane (PU) rubber, which is a hard rubber similar to the first embodiment, is used as the elastic body 8. That is, the main component of the elastic body 8 was uncrosslinked polyester polyurethane, and had hardness (JIS-A) 58, breaking strength 33 kg / cm, tensile strength 231 kg / m <2>, and elongation 340%. Both of the side collars 10 and 10 are attached to the rotation shaft 12 of the squeegee roller 6 as a suppressing member that suppresses movement in the axial direction of the elastic body 8 mounted on the surface of the squeegee roller 6. It adhered from the outside. And similarly to Example 1, the moisture content (weight%) contained in the sludge separated and recovered by both was compared.

That is, after the rotary drum type magnetic separator and the conventional rotary drum type magnetic separator were cut under the same conditions, the sludge was separated and recovered from the same amount of aqueous coolant liquid. The water content (weight%) contained in the separated and recovered sludge was measured for a plurality of operations. As a result, in the present Example 2, moisture content was 1.0 weight% less than when the CR type rubber which is a hard type rubber was used.

In addition, in the case of performing forced driving which synchronizes the rotation of the squeegeeing roller 6 with the rotation of the rotary drum 3, in the second embodiment, the moisture content is 1.7 to 1.9 weight than that of the case of using the CR rubber, which is a hard rubber. % Was reduced.

As described above, according to the second embodiment, even when the ultra-fine sludge is recovered from the oil-based coolant liquid, even when fine sludge is recovered from the aqueous coolant liquid, the deoiling (water) rate of the sludge can be improved as described above. In addition, the separation recovery rate of the ultra fine sludge generated by shaving, honing, lapping, ultrafinishing, etc., from sludge generated by grinding by bite can be greatly improved. In addition, the liquid leaking portions 21 and 21 can be reduced, so that the deoiling (water) rate of the sludge can be further improved.

(Example 3)

Sectional drawing in the surface orthogonal to the rotating shaft direction of the rotating drum which shows the structure of the rotating drum type magnetic separation apparatus which concerns on Example 3 of this invention is the same as that of the prior art, and detailed description is abbreviate | omitted by attaching | subjecting the same number as FIG. . The rotating drum magnetic separator according to the third embodiment is characterized by the polarity arrangement of the plurality of magnets 4, 4,... Arranged in the inner cylinder 5 of the rotating drum 3.

Fig. 4 is a sectional view and a front view showing the polar arrangement of the magnets 4, 4, ... of the rotating drum 3 in the rotating drum magnetic separator according to the third embodiment of the present invention. Fig. 4A is a cross-sectional view of a plane perpendicular to the rotation axis direction of the rotating drum 3 in the rotating drum magnetic separator according to the third embodiment of the present invention. The front view of the rotating drum 3 in the rotating drum type magnetic separation apparatus which concerns on Example 3 of this invention is shown, respectively. The magnet 4 forms a magnet on the rotating shaft side and the outer circumferential side, and as shown in Fig. 4A, when the rotating shaft side is the N (S) pole, the outer circumferential side becomes the S (N) pole. In addition, in FIG.4 (b), only the polarity of the side shown is shown.

In the third embodiment, the magnets 4, 4, ... are arranged so as to have the same polarity arrangement in a ring shape, and adjacent magnet rows are arranged so as to have different polarities. Therefore, as shown in Fig. 4B, the magnet row at the left end arranges the magnets 4, 4, ..., whose surface poles are the N poles in a ring shape, and the next row is the magnets whose surface poles are the S poles ( 4, 4, ... are arranged in a ring shape, and the magnets 4, 4, ... are alternately arranged in a ring shape as follows.

By arranging the magnets 4, 4, ... in this way, even in the conventional rotary drum type magnetic separation device, since the polarities of adjacent magnet rows are different, in particular, it is difficult for the needle-shaped sludge to stand upright, so that the squeegee roller 6 It was difficult to get stuck in the elastic body 8 of. However, it is not possible to exclude needle-shaped sludges standing up near the boundary of adjacent magnet rows, and when used for a long time, residual sludge is embedded in the vicinity of the position corresponding to the boundary of the magnet rows of the squeegee roller 6, thereby producing white light. The strip was formed with a sludge ring.

Therefore, in the third embodiment, the magnets 4, 4,... Which have polarities opposite to the polarities of the above-described magnet trains are arranged in the axial direction in the vicinity of the portion in contact with the squeegee roller 6. Doing. That is, the needle-shaped sludge is likely to stand upright in the normal direction of the circumferential surface of the rotating drum 3 at the gap portion where the magnet rows having different polarities face each other. Therefore, as shown by the magnets 4, 4, ... hatched in FIG. 4 (b), another magnet string having the opposite polarity in the vicinity of the portion in contact with the squeegee roller 6, By arranging in the axial direction, needle-shaped sludge which has been standing upright in the normal direction of the circumferential surface of the rotary drum 3 in the gap portion is self-supporting along the circumferential surface, and is stuck to the elastic body 8 of the squeegee roller 6. The probability is lowered.

In the same manner as in Example 1, polyurethane (PU) rubber, which is a hard rubber, is used as the squeegee roller 6 as the elastic body 8. The main component was uncrosslinked polyester polyurethane, and had a hardness (JIS-A) 58, a breaking strength of 33 kg / cm, a tensile strength of 231 kg / m 2, and an elongation of 340%. By using this elastic body 8, sludge is less likely to be embedded in comparison with the conventional one, and by arranging the polarities of the magnets 4, 4, ... as in the third embodiment, the sludge ring is hardly formed even when used for a long time. Did. Therefore, even if the sludge shape is a shape that is easy to get stuck in a squeegee roller such as a needle shape, a ring-shaped sludge ring is not formed in the elastic body 8 of the squeegee roller 6, so that the rotary drum type magnetic separator is stable for a long time. It becomes possible to function.

In the above-described example, the magnets 4, 4, ... having polarities opposite to the polarities of the magnet rows are arranged in the axial direction, but as long as the needle-shaped sludge can self-determine along the circumferential surface, Magnet strings with different polarities are not limited to one line.

(Example 4)

Sectional drawing in the surface orthogonal to the rotating shaft direction of the rotating drum which shows the structure of the rotating drum type magnetic separation apparatus which concerns on Example 4 of this invention is the same as the prior art, and detailed description is abbreviate | omitted by attaching | subjecting the same number as FIG. . The rotating drum magnetic separator according to the fourth embodiment is characterized by the polarity arrangement of the plurality of magnets 4, 4,... Arranged in the inner cylinder 5 of the rotating drum 3.

Fig. 5 is a sectional view and a front view showing the polar arrangement of the magnets 4, 4,... Of the rotating drum 3 in the rotating drum magnetic separator according to the fourth embodiment of the present invention. Fig. 5 (a) is a cross-sectional view of a plane orthogonal to the rotation axis direction of the rotary drum 3 in the rotary drum magnetic separator according to the fourth embodiment of the present invention. Fig. 5 (b) is the present invention. The front view of the rotating drum 3 in the rotating drum type magnetic separation apparatus which concerns on Example 4 is shown, respectively. The magnet 4 forms a magnet on the rotating shaft side and the outer circumferential side, and as shown in Fig. 5A, when the rotating shaft side is the N (S) pole, the outer circumferential side becomes the S (N) pole. In addition, in FIG.5 (b), only the polarity of the side shown is shown.

As shown in Fig. 5, in the fourth embodiment, magnets 4, 4, ... are arranged so as to have the same polarity arrangement in the rotational axis direction, and adjacent magnet rows are arranged so as to have different polarities. Therefore, as shown by the hatched magnets 4, 4, ... in FIG. 5 (b), the magnet rows of the first row adjacent to the squeezing roller 6 have magnets 4, 4,... ) Are arranged in the rotational axis direction, and the next column arranges the magnets 4, 4, ..., whose surface poles are S poles, in the rotational axis direction, and alternately arranges the magnets 4, 4, ... in the rotational axis direction. By arranging the magnets 4, 4, ... in this manner, the needle-shaped sludge becomes self-aligned along the circumferential surface of the rotating drum 3, and is likely to get stuck in the elastic body 8 of the squeegee roller 6. Lowers.

In the same manner as in Example 1, polyurethane (PU) rubber, which is a hard rubber, is used as the squeegee roller 6 as the elastic body 8. The main component was uncrosslinked polyester polyurethane, and had a hardness (JIS-A) 58, a breaking strength of 33 kg / cm, a tensile strength of 231 kg / m 2, and an elongation of 340%. By using this elastic body 8, sludge is less likely to be stuck compared to the conventional one, and by arranging the polarities of the magnets 4, 4, ... as in the fourth embodiment, the sludge ring is hardly formed even in the case of long-term use. Did. Therefore, even if the sludge shape is a shape that is easy to get stuck in a squeegee roller such as a needle shape, a ring-shaped sludge ring is not formed in the elastic body 8 of the squeegee roller 6, so that the rotary drum type magnetic separator is stable for a long time. It becomes possible to function.

In addition, it is possible to carry out in the form which added various changes, for example, a kind of suppression member, a change of a magnet arrangement, etc. to the said Example in the range which does not deviate from the meaning of this invention.

Claims (11)

The rotating shaft of the said rotating drum is built into the rotating drum which the inner cylinder which has arrange | positioned the some magnet was built, and the outer cylinder which consists of a non-magnetic material rotates around the fixed inner cylinder. A squeezing roller used in a rotating drum type magnetic separation device, which rotates and abuts about a parallel axis, An elastic body is disposed on the surface in contact with the rotating drum, The said elastic body consists of an uncrosslinked polyurethane material which has polyester polyol as a main component, The squeegee roller characterized by the above-mentioned. The method according to claim 1, A squeezing roller, characterized in that at both ends is provided with a restraining member that suppresses movement of the elastic body in the axial direction. A rotating drum type magnetic separation device comprising the squeegeeing roller according to claim 1. A rotating drum type magnetic separation device comprising the squeegeeing roller according to claim 2. The method of claim 3, Rotary drum type magnetic separation device, characterized in that the peripheral surface of the rotating drum to be a smooth mirror surface. The method of claim 4, Rotary drum type magnetic separation device, characterized in that the peripheral surface of the rotating drum to be a smooth mirror surface. The method of claim 3, The rotating drum, A plurality of magnet rows having the same polarity in a ring shape are arranged on three quarters of the inner cylinder circumferential surface, The polarities of the plurality of magnet rows arranged adjacent to each other in the axial direction are different from each other. And a plurality of other magnets having polarities opposite to the plurality of magnet rows, at least in line in the axial direction, in the vicinity of the portion in contact with the squeegeeing roller. The method of claim 4, The rotating drum, A plurality of magnet rows having the same polarity in a ring shape are arranged on three quarters of the inner cylinder circumferential surface, The polarities of the plurality of magnet rows arranged adjacent to each other in the axial direction are different from each other. And a plurality of other magnets having polarities opposite to the plurality of magnet rows, at least in line in the axial direction, in the vicinity of the portion in contact with the squeegeeing roller. The method of claim 5, The rotating drum, A plurality of magnet rows having the same polarity in a ring shape are arranged on three quarters of the inner cylinder circumferential surface, The polarities of the plurality of magnet rows arranged adjacent to each other in the axial direction are different from each other. And a plurality of other magnets having polarities opposite to the plurality of magnet rows, at least in line in the axial direction, in the vicinity of the portion in contact with the squeegeeing roller. The method of claim 6, The rotating drum, A plurality of magnet rows having the same polarity in a ring shape are arranged on three quarters of the inner cylinder circumferential surface, The polarities of the plurality of magnet rows arranged adjacent to each other in the axial direction are different from each other. And a plurality of other magnets having polarities opposite to the plurality of magnet rows, at least in line in the axial direction, in the vicinity of the portion in contact with the squeegeeing roller. The method according to any one of claims 3 to 6, The rotating drum, A plurality of magnet rows having the same polarity in the axial direction are arranged in three quarters of the inner cylinder circumferential surface, A rotating drum type magnetic separation device characterized in that the polarities of a plurality of magnet rows arranged adjacent to each other in a circumferential direction are different from each other.

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