JPWO2011129009A1 - Coolant purification device - Google Patents

Abstract

Magnetic separation device (11) for adsorbing sludge mixed in the coolant that has flowed out of the processing mother machine, and an inclined plate (12a) arranged such that the area of the bottom surface (12c) is smaller than the area of the upper surface , 12b), a vortex tank (13) having a pump (131) for pumping out a part of the coolant in the tank to the magnetic separation device (11), and a coolant in the tank Since a clean tank (14) having a flushing pump (141) for injecting a part of the liquid onto the liquid surface is provided, the maintainability is improved and the purification efficiency is improved.

Description

  The present invention relates to a coolant purifying apparatus for removing contaminants mixed in a coolant used in a grinding machine and other general machine tools.

  Conventionally, there is a known coolant purifying apparatus that removes contaminants such as workpiece chips (hereinafter referred to as sludge) and abrasive grains mixed in coolant used in machine tools (hereinafter referred to as processing base machines) and purifies the coolant. It has become.

  As such a coolant purifying apparatus, for example, there is an apparatus in which coolant introduced from a processing mother machine is passed in the order of a magnetic separation device, a sedimentation tank, and a clean tank to separate and remove contaminants mixed in the coolant. . The magnetic separation device is a device in which a cylindrical magnet is arranged in the inside, that is, the flow path through which the coolant passes, and the settling tank precipitates sludge etc. that could not be removed by the magnetic separation device and mixes with the coolant. A tank and a clean tank for separating materials from each other are tanks into which coolant from which contaminants have been removed in a settling tank flows. The coolant in the clean tank is sent back to the processing mother machine by a pump.

That is, most of the sludge mixed in the coolant is removed from the coolant flowing in from the processing mother machine by the aforementioned magnet when passing through the magnetic separation device, and flows out to the settling tank. In the settling tank, oil mixed in the coolant floats in the vicinity of the liquid surface, while a part of fine sludge, abrasive grains, etc. that could not be removed by the magnetic separation device are precipitated on the bottom surface.
Between the settling tank and the clean tank, for example, a partition plate that prevents the oil floating on the coolant surface from flowing into the clean tank, and the fine sludge, abrasive grains, etc. from flowing into the clean tank A plurality of partitions with a partition plate as a set are provided, so that the coolant from which suspended matter, sludge, etc. are removed flows into the clean tank, and this coolant is sent back to the processing mother machine again. .

  In addition to the above-described coolant purifying device, a vortex is generated in the tank and a part of the coolant is sent to the magnetic separation device, while the sedimenting sludge is accumulated at the bottom of the central portion (for example, In order to prevent the sludge remaining in the coolant from becoming semi-adhered in the tank, the coolant that has flowed into the tank after being processed by the magnetic separation device is stirred, and the magnetic flux is again removed from the tank. Coolant is sent to the separation device (see, for example, Patent Document 2 below). In order to prevent sludge from accumulating at the bottom of the tank, eddy currents are generated in the tank and the sludge accumulated at the bottom of the center is pumped together with the coolant. In addition, a device in which this is fed into a magnetic separation device (for example, see Patent Document 3 below) has been proposed.

Registered Utility Model No. 3032345 JP-A-11-104933 JP 2001-277067 A

  However, in the coolant purifying apparatus including the settling tank as described above, the range in which the sludge separated from the coolant settles in the settling tank covers almost the entire bottom surface of the settling tank. There was a problem that maintenance was poor, such as replacing all the coolant in the tank by pulling out the tank.

  Moreover, what was described in the patent documents 1-3 mentioned above prevents the coolant from accumulating in a tank by making the coolant containing the contaminant which could not be removed in the magnetic separator flow in a tank. However, further improvement in purification efficiency has been demanded.

  In view of the above, an object of the present invention is to provide a coolant purifying apparatus capable of improving maintainability and improving purification efficiency.

  The coolant purifying apparatus according to the first aspect of the present invention for solving the above-described problem is to remove contaminants including at least sludge mixed in the coolant that has flowed out of the processing mother machine, and send the coolant to the processing mother machine again. In the configured coolant purifying apparatus, the magnetic separation means for adsorbing the sludge mixed in the coolant that has flowed out from the processing mother machine is disposed so that the bottom surface area is smaller than the top surface area. A first treatment tank having an inclined surface, into which the coolant is introduced from the magnetic separation means, and a coolant circulation means for sending a part of the coolant in the tank to the magnetic separation means; A second processing tank into which coolant flows from the tank via the first communication means, and a coolant from the second processing tank via the second communication means. There is flowing, characterized in that it comprises a third processing tank having a coolant convective means for creating convection in the coolant in the tank.

  According to a second aspect of the present invention, there is provided a coolant purifying apparatus according to the first aspect, wherein the first continuous means is a partition plate having a through hole, and the upper end of the through hole is formed of the coolant. The lower end of the liquid level is set at a position lower than the lower limit, and the lower end is set at a position at which the contaminants precipitated in the first processing tank do not flow out to the second processing tank.

  According to a third aspect of the present invention, there is provided the coolant purifying apparatus according to the first or second aspect, wherein the coolant circulation means is provided in the second processing tank, and the center of the second processing tank is provided. A pump for pumping up coolant from the vicinity of the bottom surface of the part, and a part of the coolant pumped up by the pump for pumping is discharged so as to generate a vortex in the second treatment tank, while the remaining coolant is separated by the magnetic separation It is made to flow into the means.

  According to a fourth aspect of the present invention, there is provided a coolant purifying apparatus according to the second or third aspect of the present invention, wherein the second communication means has an outlet disposed above and an interval below the outlet. A part of the coolant pumped up by the flushing pump, wherein the coolant convection means is a flushing pump for sending the coolant to the bed of the processing base machine. Is sprayed onto the coolant level in the third treatment tank.

  According to a fifth aspect of the present invention, there is provided the coolant purifying apparatus according to any one of the first to fourth aspects, wherein the coolant purifying apparatus is located at a position corresponding to an upper surface of the first tank and directly above the inclined surface. Further, a contaminant scraping port that communicates the inside and outside of the first processing tank is provided.

  According to the coolant purifying apparatus according to the first aspect described above, the coolant is configured to remove contaminants including at least sludge mixed in the coolant that has flowed out of the processing mother machine, and to send the coolant to the processing mother machine again. The purification apparatus has a magnetic separation means for adsorbing the sludge mixed in the coolant that has flowed out of the processing mother machine, and an inclined surface that is disposed so that the area of the bottom surface is narrower than the area of the upper surface. And a first processing tank into which the coolant flows from the magnetic separation means, and a coolant circulation means for sending a part of the coolant in the tank to the magnetic separation means, A second treatment tank into which coolant is introduced via the communication means, and a coolant is introduced from the second treatment tank via the second communication means. And a third treatment tank having coolant convection means for generating convection in the coolant in the tank, so that contaminants do not settle in the second treatment tank and the third treatment tank, and Contaminants that settled in the treatment tank concentrate on the bottom surface that is set narrower than the area of the top surface, so that the maintenance position can be specified, and the work that scrapes out contaminants that have settled in the first tank Since normal maintenance can be completed, the frequency of cleaning, such as pulling out the entire processing tank and replacing all coolant, is reduced, leading to improved maintainability, and in the second and third processing tanks. Since the coolant can be repeatedly circulated to the magnetic separation means and the first treatment tank, the purification efficiency can be improved.

  Further, according to the coolant purifying apparatus according to the second invention, the first series means is a partition plate having a through hole, and the upper end of the through hole is set at a position lower than a lower limit of the coolant level. In addition, since the lower end is set at a position where the contaminants precipitated in the first treatment tank do not flow out to the second treatment tank, the contaminants flow out from the first treatment tank to the second treatment tank. Can be suppressed.

  Further, according to the coolant purification apparatus of the third invention, the coolant circulation means is a pump for pumping up the coolant from the vicinity of the bottom surface of the central portion of the second processing tank provided in the second processing tank. A part of the coolant pumped up by the pump for pumping is discharged so as to generate a vortex in the second processing tank, while the remaining coolant is allowed to flow into the magnetic separation means, so that a vortex is generated. As a result, coolant containing contaminants that precipitate near the bottom of the central portion of the second treatment tank can be pumped and flowed into the magnetic separation means, and purification efficiency is further improved.

  Moreover, according to the coolant purifying apparatus according to the fourth aspect of the present invention, the second communication means is a partition plate having an outlet provided in an upper portion and an inlet provided in a space below the outlet. In addition, the coolant convection means is a flushing pump that sends the coolant to the bed of the processing mother machine, and a part of the coolant pumped up by the flushing pump is placed on the coolant level in the third processing tank. Therefore, convection can be generated in the third processing tank by using a flushing pump that is always in operation during operation of the processing mother machine, and costs can be reduced.

  Moreover, according to the coolant purifying apparatus according to the fifth aspect of the present invention, the contaminant scraping port that communicates the inside and the outside of the first processing tank is provided at a position corresponding to the upper surface of the first tank and directly above the inclined surface. Since it is provided, it is possible to easily scrape contaminants precipitated in the first treatment tank through the inclined surface, and during normal maintenance, contaminants deposited on the bottom surface of the first treatment tank can be removed from the contaminant ejection port. Since the first processing tank can be cleaned by scraping it out of one processing tank, it is possible to reduce the frequency of performing cleaning such as pulling out the entire processing tank and replacing all the coolant. Can be improved.

It is a systematic diagram which shows the structure of the coolant purification apparatus which concerns on one Example of this invention. It is a top view of the coolant purification apparatus which concerns on one Example of this invention. It is a side view of the coolant purification apparatus which concerns on one Example of this invention. It is another side view of the coolant purification apparatus which concerns on one Example of this invention. It is a front view of the 1st partition plate of the coolant purification apparatus which concerns on one Example of this invention. It is a front view of the 2nd partition plate of the coolant purification apparatus which concerns on one Example of this invention. It is explanatory drawing which shows the flow of the coolant in the inside of the clean tank in one Example of this invention.

  Embodiments of the invention are described in detail in the following examples.

  One embodiment of the present invention will be described in detail with reference to FIGS. 1 is a system diagram showing the configuration of a coolant purification device according to the present invention, FIG. 2 is a top view showing the structure of a coolant purification device according to this embodiment, FIG. 3 is a side view of the coolant purification device according to this embodiment, 4 is a cross-sectional view taken along the line AA in FIG. 2, FIG. 5 is a front view of the first partition plate seen from the direction of the arrow BB in FIG. 2, and FIG. FIG. 7 is an explanatory view showing the flow of coolant in the clean tank. FIG. In addition, the arrow in a figure has shown the moving direction of coolant.

  As shown in FIGS. 1 to 4, in this embodiment, the coolant purifying apparatus 1 is mainly installed as a magnetic separation device 11 as a magnetic separation means, and below the magnetic separation device 11, and serves as a first processing tank. And a processing tank comprising three tanks, a vortex tank 13 as a second processing tank, and a clean tank 14 as a third processing tank.

  The magnetic separation device 11 adsorbs sludge and the like made of a magnetic material mixed in the coolant, and a rod 15 that allows the coolant that has flowed out of the processing mother machine to flow into the magnetic separation device 11 outside the magnetic separation device 11. Is provided. A cylindrical magnet 111 that adsorbs sludge by magnetic force is rotatably supported inside the magnetic separation device 11, and sludge dehydrated by a squeezing roller (not shown) is adsorbed to the magnet 111 below the magnetic separation device 11. A sludge box 16 is installed. Further, a communication hole 11 a through which coolant flows out is provided on the bottom surface of the magnetic separation device 11.

  On the other hand, the settling tank 12 and the vortex tank 13, the vortex tank 13 and the clean tank 14 are partitioned by a first partition plate 17 as a first communication means and a second partition plate 18 as a second communication means, respectively. In addition, the sedimentation tank 12 and the clean tank 14 are configured to face each other with the vortex tank 13 interposed therebetween. The sedimentation tank 12, the vortex tank 13, and the clean tank 14 are configured so that the upper surfaces thereof are almost covered by the lid bodies 120, 130, and 140, respectively.

  The sedimentation tank 12 is disposed directly below the communication hole 11a of the magnetic separation device 11, and includes a first inclined plate 12a and a second inclined plate 12b therein, and the lid 120 serves as a contaminant scraping port. A sludge scraping port 120a is formed. In addition, a communication hole 120b formed in substantially the same shape as the communication hole 11a is provided in a portion of the lid 120 that faces the communication hole 11a.

  The first inclined plate 12 a has an upper end fixed to the upper part of the side wall of the sedimentation tank 12 on the side opposite to the vortex tank 13 and is disposed obliquely downward, and a lower end on the bottom surface 12 c of the sedimentation tank 12. It is fixed. The second inclined plate 12b has its upper end fixed to the upper part of the side wall adjacent to the side wall to which the first inclined plate 12a is fixed, and, like the first inclined plate 12b, faces downward. The lower end is fixed to the bottom surface 12 c of the sedimentation tank 12. Thereby, in the sedimentation tank 12, the area of the bottom face 12c is narrower than the top face. The communication hole 11a of the magnetic separation device 11 and the communication hole 120b of the lid body 120 are disposed immediately above the second inclined plate 12b. In the present embodiment, the inclination angle of the first inclined plate 12a is larger than the inclination angle of the second inclined plate 12b.

  The sludge scraping port 120a is an opening provided so as to communicate between the inside and the outside of the sedimentation tank 12, and is provided immediately above the first inclined plate 12a so as to cut out the side end of the lid 120. Yes. A sludge box 19 is installed outside the settling tank 12 so as to correspond to the position where the sludge scraping port 120a is formed.

  Further, the vortex tank 13 is provided with a pumping pump 131 for pumping up coolant from the vicinity of the bottom surface as means for circulating the coolant at the center. This pumping pump 131 is connected with three pipes, a first pipe 132 and a second pipe 133 provided for generating eddy currents, and a third pipe 134 provided for circulating the coolant, Thus, the coolant pumped up by the pumping pump 131 can be distributed in three directions. Further, a plate body 135 is disposed inside the vortex tank 13 along the side wall of the vortex tank 13.

  The first pipe 132 and the second pipe 133 are extended from the pumping pump 131 in opposite directions, and the respective discharge ports are arranged on the bottom surface side and the side wall side of the vortex tank 13. The directions of these discharge ports are respectively set so as to discharge the coolant in the same rotational direction (clockwise in top view in this embodiment) around the pumping pump 131.

  That is, in the present embodiment, as shown in FIG. 3, the first pipe 132 is set so that the coolant is discharged from the discharge port toward the settling tank 12 side, while the second pipe 133 is The direction is set so that the coolant is discharged from the discharge port toward the clean tank 14 side. The third pipe 134 is configured to discharge coolant to the flange 15.

  Further, the plate body 135 is provided so that the coolant smoothly flows in the vortex tank 13 when the vortex flow is generated in the vortex tank 13 by the first pipe 132 and the second pipe 133. The vortex tank 13 has four curved portions that cover the corners in a circular arc shape when viewed from above. At least the plate body 135 is configured such that the downstream side end of the curved portion covering the corner on the downstream side of the second partition plate 18 is separated from the side wall of the vortex tank 13.

  The clean tank 14 includes a flushing pump 141 provided for discharging coolant to the bed of the processing mother machine, a processing unit pump 142 provided for discharging coolant to a processing location by the processing mother machine, and a processing mother machine. A liquid level gauge 144 is provided together with three pumps of a dress pump 143 provided for discharging coolant for dressing the grinding wheel.

  The flushing pump 141 is always operated during the operation of the processing mother machine. In this embodiment, the pipe connected to the flushing pump 141 has a discharge port branched in two directions, one of which is the bed of the processing mother machine. On the other hand, the other is flushed toward the upper surface of the coolant in the clean tank 14 as coolant convection means. Moreover, piping is connected so that the process part pump 142 and the dress pump 143 may respectively discharge coolant to the position mentioned above.

  The liquid level gauge 144 is configured to detect the position of the coolant liquid level and to notify when the liquid level position reaches a preset lower limit. A control device 20 that performs various controls related to the coolant purification device 1 is installed outside the clean tank 14.

  Further, as shown in FIG. 5, the first partition plate 17 that partitions the settling tank 12 and the vortex tank 13 has a through hole 17 a serving as an outlet for allowing the coolant to flow out from the settling tank 12 to the vortex tank 13. Is formed. The through hole 17a is set so that the upper end is lower than the lower limit of the coolant level, and the lower end is set at a position where sludge or the like settled in the settling tank 12 does not flow out from the settling tank 12 to the vortex tank 13. ing.

  The position of the through hole 17a in the horizontal direction (longitudinal direction in FIG. 5) is set so that the through hole 17a and the second inclined plate 12b of the settling tank 12 have a predetermined interval. Thereby, in this embodiment, the center position of the through-hole 17a with respect to the horizontal direction is biased toward the bottom surface 12c side of the settling tank 12 as compared with the center position of the first partition plate 17.

  As shown in FIG. 6, the second partition plate 18 that partitions the vortex tank 13 and the clean tank 14 has an upper through-hole as an outlet at a downstream side end of the vortex generated in the vortex tank 13. 18a and a lower through-hole 18b as an inflow port are formed vertically at a predetermined interval from each other. The upper through-hole 18a is formed so as to be spaced from the upper end of the second partition plate 18, and the lower through-hole 18b is formed so as to cut out a corner at the lower end of the second partition plate 18.

  The operation of this embodiment will be described below. In the coolant purifying apparatus according to the present embodiment, the coolant flowing out from the processing mother machine flows into the magnetic separation device 11 through the flange 15. The coolant that has flowed into the magnetic separation device 11 adsorbs and separates most of the sludge by the magnet 111 and flows out to the sedimentation tank 12 through the communication holes 11a and 120b.

  Here, the coolant flowing into the sedimentation tank 12 from the magnetic separation device 11 contains fine sludge, abrasive grains, etc. (hereinafter referred to as residual contaminants) that could not be removed by the magnetic separation device 11. Such residual contaminants precipitate in the settling tank 12. At this time, since the first inclined plate 12a and the second inclined plate 12b are formed in the settling tank 12, most of the residual contaminants are transferred to the upper surface by the first inclined plate 12a and the second inclined plate 12b. In contrast, it is guided to the bottom surface 12c side where the area is reduced and precipitates. That is, in the sedimentation tank 12, the residual contaminants are concentrated and settled on the bottom surface 12c having a reduced area.

  The coolant from which most of the residual contaminants have been removed in the settling tank 12 is further discharged to the vortex tank 13 side through the through holes 17 a provided in the first partition plate 17.

  As described above, the through hole 17a provided in the first partition plate 17 is set so that its upper end is lower than the lower limit of the coolant level, and sludge or the like whose lower end has settled in the settling tank 12 is formed. The position is set so as not to flow out from the settling tank 12 to the vortex tank 13, and the horizontal position is set so as to have a predetermined interval between the second inclined plate 12 b of the settling tank 12.

  Therefore, when a situation occurs in which the coolant bubbles in the sedimentation tank 12 and the residual contaminants are included in the foam, the residual contaminants flow out to the vortex tank 13 through the through holes 17a. The coolant can flow out to the vortex tank 13 while preventing the residual contaminants precipitated on the bottom surface 12 and the inclined portions 12a and 12b from flowing out to the vortex tank 13 through the through holes 17a.

  In the vortex tank 13, the coolant pumped up by the pump for pumping 131 is discharged from the first pipe 132 and the second pipe 133 on the bottom surface and in the vicinity of the side wall of the vortex tank 13, thereby generating a vortex. It is configured. The coolant that has flowed into the vortex tank 13 contains residual contaminants such as fine sludge and abrasive grains that could not be removed by the precipitation tank 12, so if vortex flow occurs in the vortex tank 13, The objects gather near the bottom of the central portion of the vortex tank 13 and are always pumped up by the pumping pump 131 together with the coolant.

  As described above, the coolant containing the residual contaminants pumped by the pump 131 for pumping is discharged from the first pipe 132 and the second pipe 133 to the bottom surface and the vicinity of the side wall of the vortex tank 13, while the third pipe. It is sent out to 134 from 134. Thus, in this embodiment, the coolant in the vortex tank 13 is passed again through the magnetic separation device 11 and the sedimentation tank 12 together with the coolant sent out from the processing mother machine, and the contaminant removal process is repeated.

  On the other hand, in the clean tank 14, a portion of the coolant pumped up by the flushing pump 141 is disposed in the vicinity of the side surface on the opposite side of the clean tank 14 where the upper through hole 18a of the second partition plate 18 is formed. Then, the coolant is sprayed onto the upper surface of the coolant through the pipe 145 so that convection is generated in the coolant in the clean tank 14 as shown in FIG. When convection occurs in the coolant in this way, the coolant in the clean tank 14 gradually flows out from the upper through hole 18 a of the second partition plate 18 to the vortex tank 13.

  At this time, residual contaminants such as sludge floating near the coolant level flow into the vortex tank 13. The residual contaminants are moved to the vicinity of the bottom of the central portion by the vortex in the vortex tank 13 and are pumped up by the pump for pumping 131. As described above, the magnetic separation device 11, the precipitation tank 12, and the vortex tank 13 are It will be removed while circulating.

  In addition, the coolant flows from the clean tank 14 to the vortex tank 13 through the upper through hole 18 a provided in the second partition plate 18, thereby circulating through the magnetic separation device 11, the precipitation tank 12, and the vortex tank 13. The coolant from which most of the contaminants have been removed flows into the clean tank 14 through the lower through hole 18b. Thereby, the coolant in the clean tank 14 can be made into a state with few contaminants.

  The other coolant pumped up by the flushing pump 141 and the coolant pumped up by the processing pump 142 and the dressing pump 143 are sent to the processing base machine for bed flushing, cooling of the processing section, and dressing of the grindstone, respectively. Sent out.

  According to the above-described coolant purifying apparatus according to the present embodiment, the first inclined plate 12a and the second inclined plate 12b are provided in the settling tank 12, thereby precipitating contaminants such as sludge settling in the settling tank 12. By providing a sludge scraping port 120a at a position corresponding to the upper end of the first inclined plate 12a of the lid 120 of the settling tank 12 while being allowed to settle on a specific region in the tank 12, that is, the bottom surface 12c. The contaminants precipitated on the bottom surface 12c can be easily scraped out from the sludge scraping outlet 120a through the first inclined plate 12a.

  Accordingly, during normal maintenance, the sedimentation tank 12 can be cleaned by scraping out contaminants precipitated on the bottom surface 12d of the sedimentation tank 12 from the sludge scraping port 120a to the outside of the precipitation tank 12, so that the entire tank is drawn out. Therefore, it is possible to reduce the frequency of cleaning that replaces all the coolant, and to improve maintainability.

  Further, the coolant sent from the processing mother machine is passed through the magnetic separation device 11 and the sedimentation tank 12 to remove contaminants such as sludge mixed in the coolant, and the magnetic separation device 11 and the precipitation tank. The residual contaminants that could not be removed at 12 are collected in a specific location (near the bottom of the central portion) by generating a vortex in the coolant in the vortex tank 13 and again passed through the magnetic separation device 11 and the sedimentation tank 12. Since the coolant circulates in the magnetic separator 11, the sedimentation tank 12, and the vortex tank 13, the purification efficiency can be improved.

  Further, in the clean tank 14, the coolant discharge pumped up by the flushing pump 141 is branched and one of the coolant is jetted onto the upper surface of the coolant, thereby causing convection in the coolant in the clean tank 14 and the coolant in the clean tank 14. Since a part of the gas flows into the vortex tank 13, the purification efficiency can be further improved.

  As described above, according to the coolant purifying apparatus according to the present embodiment, it is possible to improve the maintainability, improve the purification efficiency, and more reliably remove sludge and the like mixed in the coolant sent from the processing base machine. can do.

  In addition, this invention is not limited to the Example mentioned above, For example, various changes are made in the range which does not deviate from the meaning of this invention, such as making the 1st inclined surface 12a and the bottom face 12c smoothly continue. Needless to say, this is possible.

  The present invention is suitable for use in a coolant purification apparatus.

DESCRIPTION OF SYMBOLS 1 Coolant purification apparatus 11 Magnetic separation apparatus 11a, 120b Communication hole 12 Sedimentation tank 12a, 12b Inclined plate 12c Bottom face 13 Eddy flow tank 14 Clean tank 15 １６ 16, 19 Sludge box 17 First partition plate 18 Second partition plate 120, 130,140 Lid 120a Sludge scraping port 131 Coolant pumping pump 132,133,134 Piping 141 Flushing pump 142 Processing pump 143 Dress pump 144 Liquid level gauge

Claims (5)

In the coolant purifier configured to remove contaminants including at least sludge mixed in the coolant that has flowed out of the processing mother machine and to send the coolant to the processing mother machine again,
Magnetic separation means for adsorbing the sludge mixed in the coolant that has flowed out of the processing mother machine;
A first processing tank having an inclined surface disposed so that an area of the bottom surface is narrower than an area of the upper surface, and into which the coolant flows from the magnetic separation means;
A second processing tank having coolant circulation means for sending a part of the coolant in the tank to the magnetic separation means, and into which the coolant flows from the first processing tank through the first communication means;
A coolant purifying apparatus, comprising: a third treatment tank having a coolant convection means for causing a coolant to flow from the second treatment tank through the second communication means and generating convection in the coolant in the tank. The first series means is a partition plate having a through hole, and the through hole is set at a position where the upper end is lower than the lower limit of the liquid level of the coolant, and the lower end settles in the first processing tank. The coolant purifying apparatus according to claim 1, wherein an object is set at a position where it does not flow into the second processing tank. The coolant circulating means is a pump for pumping up coolant from the vicinity of the bottom surface of the central portion of the second processing tank provided in the second processing tank;
A part of the coolant pumped up by the pump for pumping is discharged so as to generate a vortex in the second processing tank, while the remaining coolant is allowed to flow into the magnetic separation means. The coolant purifying apparatus according to 1. The second communication means is a partition plate having an outlet provided at an upper portion and an inlet provided at an interval below the outlet, and
The coolant convection means is a flushing pump for sending the coolant to the bed of the processing mother machine;
The coolant purifying apparatus according to claim 1, wherein a part of the coolant pumped up by the flushing pump is jetted onto a coolant level in the third treatment tank. The coolant purifying apparatus according to claim 1, wherein a contaminant scraping port that communicates the inside and outside of the first processing tank is provided at a position corresponding to an upper surface of the first tank and directly above the inclined surface. .

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