JP2011240453A - Treatment liquid cleaning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a treatment liquid cleaning device in which even sludge with relatively small specific gravity can be surely removed to properly clean a treatment liquid even if a coolant or the like high in bubbling property is used as the treatment liquid.SOLUTION: The treatment liquid cleaning device includes a centrifugal separator 10 for receiving the treatment liquid containing the sludge to be cleaned and centrifugally separating the treatment liquid to be cleaned into a first treatment liquid containing a sludge component more than that of the treatment liquid to be cleaned and a second treatment liquid containing the sludge component smaller than that of the treatment liquid to be cleaned, a receiving tank 20 for receiving the first treatment liquid, a suction means 32 for sucking bubbles B1 on a surface of the treatment liquid in the receiving tank 20 together with the treatment liquid in a mixed state, and a filtration means 40 for receiving a discharged treatment liquid discharged from the suction means 32 and filtrating the discharged treatment liquid. The treatment liquid is filtrated through the filtration means 40 to obtain a filtrated treatment liquid.

Description

  The present invention accepts a treatment liquid to be purified containing sludge, into a first treatment liquid having more sludge components than the treatment liquid to be purified and a second treatment liquid having less sludge components than the treatment liquid to be purified. The present invention relates to a treatment liquid purification apparatus including a centrifuge for centrifuging and a receiving tank for receiving the first treatment liquid.

  Conventionally, processing liquids such as coolant used for machines that perform cutting, grinding, rolling, etc. (hereinafter collectively referred to simply as machine tools) are generally stored in a storage tank, and the storage tank and machine tool are stored by a circulation pump. It is reused by circulating.

  In such reuse, contaminants such as chips and abrasive grains (hereinafter referred to as sludge) are mixed in the processing liquid used in the machine tool. And in the state where sludge is mixed in the processing liquid in this way, the processing accuracy of the machine tool may be affected, and adverse effects such as wear and failure of movable parts and jigs of the machine tool may occur. . For this reason, when reusing the treatment liquid, the treatment liquid containing the sludge is circulated in the tank to precipitate the sludge, or the sludge is removed by using a filter, a magnetic separator, or a centrifugal separator. Has been done.

  As a treatment liquid purification apparatus for purifying such treatment liquid, for example, a treatment liquid containing a sludge after use in a machine tool is received, and a sludge component of the treatment liquid containing the sludge is removed by centrifugal force. A centrifugal separator that separates a large amount of treatment liquid into a treatment liquid that has less sludge components than the treatment liquid to be purified, and a receiving tank that stores a treatment liquid that has more sludge components than the treatment liquid to be purified. (For example, Patent Document 1).

  In the processing liquid purification apparatus disclosed in Patent Document 1, sludge contained in the processing liquid after being used in a machine tool is removed by centrifugal separation using a centrifugal separator, and the sludge component separated by the centrifugal separator is removed. It is configured to reuse a clean processing liquid with a small amount of machine tools.

Japanese Patent Publication No. 3-68767

However, in the treatment liquid purification apparatus disclosed in Patent Document 1, sludge having a relatively large specific gravity can be separated and removed well by centrifugation using a centrifuge, but sludge having a small specific gravity is completely separated and removed only by centrifugation. It was difficult. In this case, there is a possibility that the processing liquid containing the sludge that could not be separated and removed is supplied to the machine tool.
Further, for example, a highly foamable liquid has recently been used as a coolant (an example of a treatment liquid). As a result, the coolant liquid may foam when it is received in the receiving tank, and may generate bubbles near the liquid surface of the receiving tank. In this case, sludge having a small specific gravity is adsorbed by the bubbles, floats in the vicinity of the liquid surface together with the bubbles and does not settle in the receiving tank, making recovery difficult. In addition, sludge adsorbed by bubbles and present near the liquid surface is mistakenly sucked into a centrifuge disposed at the upper part of the receiving tank due to the increase in the bulk of the bubbles, and the amount of sludge components that have been centrifuged is small. Despite being mixed in the processing liquid and including sludge, there is a problem that it is supplied to a machine tool or the like as a clean processing liquid. Further, the sludge overflows with bubbles from the liquid level of the receiving tank, which causes a problem of polluting the surrounding environment.

  The present invention has been made in view of the above problems, and its purpose is to reliably remove sludge having a relatively small specific gravity even when a processing liquid such as coolant having a high foaming property is used. The object of the present invention is to provide a treatment liquid purifying apparatus capable of appropriately purifying.

  In order to achieve the above object, the characteristic configuration of the treatment liquid purifying apparatus according to the present invention receives a treatment liquid to be purified including sludge, and includes a first treatment liquid having more sludge components than the treatment liquid to be purified; A centrifuge for centrifuging into a second processing liquid having a sludge component less than the processing liquid to be purified, a receiving tank for receiving the first processing liquid, and processing bubbles on the liquid level of the processing liquid in the receiving tank A suction means for mixing and sucking together with the liquid; and a filtration means for receiving the discharge treatment liquid discharged from the suction means and filtering the discharge treatment liquid. It is in the point to get.

According to the above characteristic configuration, the bubbles on the liquid level of the processing liquid in the receiving tank are mixed and sucked together with the processing liquid by the suction means, so that the bubbles including sludge having a relatively small specific gravity can be reliably received from the receiving tank. Can be discharged. As a result, the sludge adsorbed by the bubbles and present in the vicinity of the liquid level of the receiving tank is mistakenly sucked into the centrifuge and mixed with the clean processing liquid having a small amount of sludge components or the receiving tank. It is possible to avoid the situation where the liquid overflows with bubbles.
Further, the bubbles and the processing liquid mixed and sucked by the suction means are discharged as a discharge processing liquid to the filtering means, and are filtered and defoamed by the filtering means. Therefore, sludge contained in the bubbles (relatively low specific gravity) Sludge) can be surely separated and removed by the filtration means, and the foam itself can be removed to obtain a post-filtration treatment liquid.
Therefore, even when a highly foamable treatment liquid is used, the treatment liquid (bubbles) containing sludge having a relatively small specific gravity is well prevented from being supplied to a machine tool or the like as a clean treatment liquid. The liquid can be appropriately purified to obtain a clean treatment liquid.
In addition, since the processing liquid purification apparatus is provided with a centrifuge and a receiving tank, sludge having a relatively large specific gravity contained in the processing liquid to be purified is separated from the centrifuge and the receiving tank. The precipitate can be separated and removed satisfactorily.

  The processing liquid purifying apparatus according to the present invention is further characterized in that the suction means includes an ejector that causes the processing liquid to flow through the throttling portion and sucks the bubbles into a suction portion that communicates with the throttling portion. In the point.

According to the above characteristic configuration, since the ejector is used as the suction means, when the processing liquid flows through the throttle portion of the ejector, sludge with a relatively small specific gravity existing near the liquid surface of the receiving tank is removed from the suction portion of the ejector. It can be configured to aspirate the containing foam. Thereby, it is possible to reliably suck the bubbles while omitting the power source of the suction means itself and having a simple configuration.
In addition, since the foam is sucked by the ejector, for example, unlike the case where the pump is placed downstream of the receiving tank and sucked, there is a problem that air flows into the pump and water feeding becomes difficult, and the mechanical seal of the pump is burned. The occurrence of such problems can also be prevented.

  A further characteristic configuration of the processing liquid purification apparatus according to the present invention includes a clean tank that stores the second processing liquid or the post-filtration processing liquid separately from the receiving tank, and is stored in the clean tank. A liquid feeding means for sending the treatment liquid to the filtering means is provided, and the suction means is provided between the clean tank and the filtering means.

According to the above characteristic configuration, the processing liquid sent to the filtering means becomes the foam mixed and sucked by the suction means and the relatively clean second processing liquid or the post-filtration processing liquid stored in the clean tank. The amount of sludge is reduced as compared with the case where the foam mixed and sucked by the suction means and the first processing liquid are sent. Thereby, the amount of sludge to be processed by the filtering means (for example, constituted by a filter or the like) can be reduced, and the sludge filtering ability in the filtering means can be maintained for a long period of time.
In this way, by storing a relatively clean processing liquid purified by a centrifuge or filtration means in the clean tank, the clean tank functions as a buffer, and the processing liquid is further removed by precipitation separation of sludge in the clean tank. We can expect purification.

  A further characteristic configuration of the treatment liquid purifying apparatus according to the present invention is that the filtering means includes a thickener back filter.

  According to the above characteristic configuration, the thickener back filter is a mechanism for filtering sludge and removing bubbles by sequentially using a plurality of processing chambers. be able to. Therefore, sludge in the processing liquid can be surely filtered and removed, and bubbles in the processing liquid can be eliminated, without stopping the machine tool or the like that uses the processing liquid as much as possible. In addition, the thickener back filter is easily available and has a relatively simple structure, and therefore has an advantage that the filtration means is easily maintained.

1 is a schematic configuration diagram showing a first embodiment of a coolant purification device according to the present invention. Schematic of thickener back filter which is one embodiment of filtering means The schematic block diagram which shows 2nd Embodiment of the coolant purification apparatus which concerns on this invention. The schematic block diagram which shows 3rd Embodiment of the coolant purification apparatus which concerns on this invention. The schematic block diagram which shows 4th Embodiment of the coolant purification apparatus which concerns on this invention. The schematic block diagram which shows 5th Embodiment of the coolant purification apparatus which concerns on this invention.

  Below, the coolant liquid purification apparatus as a process liquid purification apparatus which concerns on this invention is demonstrated based on FIGS.

[First Embodiment]
FIG. 1 is a schematic configuration diagram showing a first embodiment of a coolant purification apparatus according to the present invention. FIG. 1 shows an example in which a coolant liquid (an example of a processing liquid) used in the machine tool M / C is purified by a coolant liquid purification apparatus 1. The coolant liquid purification apparatus 1 receives coolant liquid containing sludge after use (hereinafter referred to as post-use coolant liquid) in such a machine tool M / C, removes sludge, purifies it, and reuses the coolant liquid. It is an object.

  First, the configuration of the coolant liquid purification apparatus 1 will be described. The coolant liquid purification apparatus 1 receives a coolant liquid after use in the machine tool M / C as a treatment liquid to be purified, and a first coolant liquid (an example of a first treatment liquid) having a larger amount of sludge components than the coolant liquid to be purified. A centrifugal separator 10 that separates into a second coolant liquid (an example of the second processing liquid) that has less sludge components than the processing liquid to be purified, and the centrifugal separator 10 is installed below the centrifugal separator 10 and separated by the centrifugal separator 10. And a sludge tank 20 (an example of a receiving tank) for storing the first coolant liquid. Further, the bubbles B1 on the liquid surface of the sludge tank 20, the sludge B2 having a relatively small specific gravity adsorbed by the bubbles B1 (hereinafter abbreviated as sludge B2), and the second coolant liquid stored in the clean tank 50. And a mixed liquid of the filtered coolant liquid (an example of the post-filter processing liquid) (an example of the processing liquid that the suction means mixes and sucks with the foam) and discharges the discharged coolant liquid (an example of the discharged processing liquid). A suction mechanism 30 and a thicker back filter 40 (an example of a filtering means) that removes (filters and defoams) the bubbles B1 and sludge B2 from the discharged coolant liquid including the bubbles B1 and sludge B2 discharged from the suction mechanism 30. I have.

  Moreover, the coolant liquid purifying apparatus 1 sends out the coolant liquid used in the machine tool M / C from the clean tank 50 to the machine tool M / C, and after using the coolant liquid in the machine tool M / C (after use) (Coolant liquid) is stored in the dirty tank 60, and then the used coolant liquid is purified, and the clean coolant liquid after purification is stored in the clean tank 50.

  That is, the coolant purification apparatus 1 uses a clean tank 50 that stores the clean second coolant liquid discharged from the centrifuge 10 and the purified filtered coolant liquid discharged from the thickener back filter 40 as a sludge tank 20. It is provided separately.

  In addition, the clean tank 50 is connected to the thickener back filter 40 via the suction mechanism 30, and the mixed liquid of the second coolant liquid and the filtered coolant liquid stored in the clean tank 50 is separated from the clean tank 50. The liquid is supplied to the thickener back filter 40 by a filtering coolant liquid delivery pump 35 which is a liquid feed means provided on the coolant liquid supply path 34B which is a connection pipe line with the thickener back filter 40.

〔Machine Tools〕
The machine tool M / C is a machine that performs cutting processing, grinding processing, rolling processing, and the like, and uses a processing liquid such as a coolant for cooling and cleaning. Sludges such as chips and abrasive grains are usually mixed in the processing liquid such as coolant liquid used for cooling and cleaning the machine tool M / C. The coolant liquid purification apparatus 1 receives the coolant liquid after use with such a machine tool M / C and removes sludge for purification.

(Centrifuge)
The centrifugal separator 10 adopts a cyclone type, and utilizes the difference in specific gravity of components contained in the coolant liquid to be purified to change the coolant liquid to be purified from the first coolant liquid having a large amount of sludge components by centrifugal force. Separated into a second coolant liquid with less sludge components. The centrifuge 10 in the coolant purifier 1 discharges the first coolant liquid having a large amount of sludge components and a large specific gravity to the sludge tank 20 installed below the centrifuge 10, and the second coolant having a small amount of sludge components and a small specific gravity. The liquid is discharged into the clean tank 50 as a purified coolant liquid that has been purified.

[Suction mechanism]
The suction mechanism 30 includes a throttle part (not shown) through which a mixed liquid of the second coolant liquid and the filtered coolant liquid flows, and a suction part (not shown) in communication with the throttle part, and the second coolant liquid When the mixed liquid of the coolant liquid after filtration flows through the throttle part, negative pressure is generated, and an ejector 32 (an example of a suction unit) that sucks the foam B1 and the sludge B2 into the suction part, and the sludge B2 included in the foam B1 and the foam B1 A suction port 31 for sucking the liquid from the sludge tank 20, a discharge port 33 for discharging a mixed liquid of the sucked bubbles B1 and sludge B2, the second coolant liquid and the filtered coolant liquid, a suction port 31, an ejector 32, and a clean tank. 50 and a pipe 34 connecting the discharge port 33.

  In the coolant liquid purification apparatus 1, the suction mechanism 30 has a suction port 31 at a height slightly lower than the overflow discharge port 21 of the sludge tank 20, and the liquid is discharged from the suction port 31 when the sludge tank 20 is close to overflow. The bubbles B1 near the surface and the sludge B2 can be sucked.

Further, in the ejector 32, the pipe 34A connecting the suction port 31 and the coolant supply path 34B is connected to the suction part and the throttle part for allowing the driving fluid to flow through the coolant supply path 34B. Then, the suction mechanism 30 causes the ejector 32 to generate a negative pressure by causing the mixed liquid of the second coolant liquid and the filtered coolant liquid to flow through the throttle portion of the ejector 32 connected to the coolant liquid supply path 34B. The bubbles B1 and the sludge B2 on the liquid surface of the first coolant liquid in the sludge tank 20 are sucked from the suction port 31 through 34A.
The coolant liquid supply path 34B connects the clean tank 50 and the thickener back filter 40, and the second coolant liquid and the filtered coolant liquid are filtered from the clean tank 50 to the thickener back filter 40 by the filtering coolant liquid feed pump 35. This is a pipe for delivering the mixed liquid. In addition, the discharge port 33 corresponds to the connection point between the coolant liquid supply path 34 </ b> B and the thickener back filter 40.

  According to the above configuration, the suction mechanism 30 can suck the bubbles B1 near the liquid surface and the sludge B2 from the suction port 31 in a state close to overflow, so that the bubbles including the sludge B2 having a relatively low specific gravity. B1 can be reliably discharged from the sludge tank 20. As a result, the sludge B2 adsorbed by the bubbles and existing in the vicinity of the liquid surface of the sludge tank 20 is accidentally sucked into the centrifuge 10 due to the increase in the bulk of the bubbles B1, and the cleaned sludge component with less sludge components It is possible to avoid a situation where it is mixed in a processing solution or overflows from the liquid surface of the sludge tank 20 together with the bubbles B1 and contaminates the environment such as the surrounding floor.

[Filtering means]
As shown in FIG. 2, the thickener back filter 40 includes, for example, a plurality of processing chambers 40A, 40B, 40C,. The thickener back filter 40 is excellent as a filtering means in that it can remove bubbles and sludge contained in the coolant without stopping the machine tool M / C. 2, a plurality of processing chambers 40A, 40B, 40C,... Are referred to as a processing chamber 40B when the processing chamber 40A is full, and a processing chamber 40C when the processing chamber 40B is full. In addition, since the sludge B2 is accumulated in each processing chamber while being used sequentially, for example, even when the processing chamber 40B is clogged due to the accumulation of the sludge B2 and moves to the subsequent processing chamber 40C, the subsequent processing chambers 40C, 40D, ... is not clogged and has a feature that it can continue to exhibit an excellent removal effect (filtration ability) by moving to the processing chamber 40C. The filtration performance of the thickener back filter 40 can be adjusted, for example, between 1 micron and 100 microns by selecting the type of the thickener back filter 40.

According to the above configuration, the bubbles B1 and the sludge B2 contained in the discharged coolant liquid received by the thickener back filter 40 are filtered and defoamed, so that the bubbles B1 sucked from the liquid surface of the sludge tank 20 and the bubbles B1 The contained sludge B2 (sludge having a relatively low specific gravity) can be reliably separated and removed.
Therefore, even when a highly foamable coolant is used, the coolant (foam) containing sludge having a relatively small specific gravity can be appropriately removed, and a clean coolant can be obtained.

  Furthermore, as equipment for sending the mixed liquid of the second coolant liquid and the filtered coolant liquid stored in the clean tank 50 to the machine tool M / C, the cleaning liquid delivery pump 53, the clean tank 50 and the machine tool M / C A cleaning fluid pipe 54 is provided to connect C.

  According to the above configuration, the coolant liquid purification apparatus 1 supplies the second coolant liquid with a small amount of sludge component and the post-filtered coolant liquid obtained by the separation by the centrifuge 10 and the purification by the thickener back filter 40 to the clean tank 50. Can be stored. Thereby, the coolant purification apparatus 1 can supply the mixed liquid of the second coolant liquid and the filtered coolant liquid to the machine tool M / C.

[Equipment for storing coolant after use]
In addition, the coolant liquid purification apparatus 1 includes a dirty tank 60 as equipment for storing the coolant liquid to be purified including sludge and the like after use in the machine tool M / C. In addition, after-use piping 71 for connecting the machine tool M / C and the dirty tank 60 as equipment for sending the coolant liquid to be purified including contaminants such as sludge after use in the machine tool M / C to the dirty tank 60. It has. Then, as equipment for sending the coolant liquid containing the sludge stored in the dirty tank 60 to the centrifuge 10, the sludge containing liquid delivery pump 72, the sludge containing liquid pipe 73 connecting the dirty tank 60 and the centrifuge 10. It has.

  According to the above configuration, the coolant liquid purification apparatus 1 stores the coolant liquid to be purified, including contaminants such as sludge, in the dirty tank 60 when used in the machine tool M / C, and then introduces it into the centrifuge 10. It becomes possible to purify.

[Flow of Coolant Solution Purification Process According to First Embodiment]
Next, the flow of the coolant cleaning process performed by the coolant cleaning apparatus 1 will be described. In the coolant liquid purification apparatus 1, clean coolant liquid used in the machine tool M / C is stored in the clean tank 50. The coolant liquid purification apparatus 1 is configured to send clean coolant liquid stored in a clean tank 50 to a machine tool M / C through a clean liquid pipe 54 by a purification liquid delivery pump 53.

  And the sludges, such as a chip and an abrasive grain, mix in the coolant liquid used with machine tool M / C. In the coolant liquid purification apparatus 1, coolant liquid (contained coolant liquid after use) containing contaminants such as sludge after use in such a machine tool M / C is sent to the dirty tank 60 through the post-use pipe 71 and stored. The used coolant liquid stored in the dirty tank 60 is then sent to the centrifuge 10 through the separator delivery pipe 73 by the after-use liquid delivery pump 72 for purification.

The used coolant liquid introduced into the centrifuge 10 is divided into a first coolant liquid having a larger sludge component than the coolant liquid to be cleaned and a second coolant liquid having a smaller sludge component than the coolant liquid to be cleaned. Separated into coolant liquid. The first coolant liquid having a larger amount of sludge components and a larger specific gravity than the coolant liquid to be purified is discharged and stored in a sludge tank 20 installed below the centrifuge 10.
On the other hand, the second coolant liquid having a smaller sludge component and lower specific gravity than the coolant liquid to be purified is sent to the clean tank 50 through the sludge-separated pipe 51 and stored by the centrifuge 10.

  Here, in the sludge tank 20, when the 1st coolant liquid stored has foamability, the 1st coolant liquid produces the bubble B1 near the liquid level of the sludge tank 20 by the foamability. However, in the coolant purifier 1, the first coolant liquid sucks the foam B1 generated near the liquid surface of the sludge tank 20 and the sludge B2 contained in the foam by the suction mechanism 30 and mixes it with the coolant liquid, and then the thickener back filter 40. It is comprised so that it may discharge to.

  That is, the sludge tank 20 overflows when the liquid level reaches a predetermined height in order to prevent storage of the first coolant liquid of a predetermined amount or more, and discharges the stored first coolant liquid to the dirty tank 60. An overflow discharge port 21 is provided. As described above, the sludge tank 20 has the suction port 31 at a height slightly lower than the overflow discharge port 21, and when the sludge tank 20 approaches the overflow, the bubble B1 near the liquid surface from the suction port 31. And it is comprised so that the sludge B2 which the said bubble B1 contains may be attracted | sucked.

  Here, as described above, when it is necessary to suck the foam B1 in the vicinity of the liquid surface of the sludge tank 20 and the sludge B2 contained in the foam B1, the coolant purifier 1 operates the coolant coolant delivery pump 35 for filtration. The mixed liquid of the second coolant liquid and the filtered coolant liquid is passed through the ejector 32. Then, the bubbles B1 near the liquid surface of the sludge tank 20 and the sludge B2 included in the bubbles B1 are sucked from the suction port 31.

  The foam B1 sucked from the suction port 31 and the sludge B2 included in the foam B1 pass through the pipe 34A and are introduced into the coolant liquid supply path 34B. Then, the ejector 32 is mixed with the mixed liquid of the second coolant liquid flowing through the coolant liquid supply path 34 </ b> B and the filtered coolant liquid, and discharged from the discharge port 33 to the thickener back filter 40.

  The thickener back filter 40 removes the foam B1 and the sludge B2 from the mixed liquid of the foam B1 and the sludge B2, the second coolant liquid and the filtered coolant liquid by filtration. Then, the filtered coolant liquid purified by removing the bubbles B1 and the sludge B2 and discharged from the thickener back filter 40 is discharged to the clean tank 50 by the post-filtering pipe 43 and stored.

  The above is the flow of the purification process in the coolant liquid purification apparatus 1. After the storage in the clean tank 50, the state returns to the state before supplying the coolant liquid from the clean tank 50 to the machine tool M / C that started the explanation of the purification process, and the coolant liquid is supplied from the clean tank 50 to the machine tool M / C. After the supply, the purification process is repeated. That is, according to the above configuration, the coolant liquid can be circulated and reused by use, purification, and storage.

[Second Embodiment]
Next, a second embodiment of the coolant purification device will be described. In the following, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof is omitted.

  In the coolant purification apparatus 1a according to the second embodiment shown in FIG. 3, the second coolant obtained by the centrifugal separator 10 is used for mixing and sucking the bubbles B1 and the sludge B2.

  That is, in the coolant purification apparatus 1a, the centrifuge 10 is connected to the thickener back filter 40 via the suction mechanism 30, and the second coolant liquid obtained by the centrifuge 10 is used as the centrifuge 10 and the thickener. The liquid is supplied to the thickener back filter 40 through a coolant liquid supply path 34Ba which is a connecting pipe line with the back filter 40.

  Further, in the coolant purifier 1a, when the centrifuge 10 is driven and the second coolant liquid is obtained, the second coolant liquid is passed through the ejector 32 of the suction mechanism 30 to thereby make the sludge tank 20 From the vicinity of the liquid surface, the bubbles B1 and the sludge B2 are sucked through the suction port 31. Then, the sucked foam B1 and sludge B2 and the second coolant liquid are filtered through the thickener back filter 40 as a discharge coolant liquid. And the filtered coolant liquid obtained by filtration with the thickener back filter 40 is stored in the clean tank 50 as a clean coolant liquid, and used for the machine tool M / C.

According to the coolant liquid purification apparatus 1a described above, the second coolant liquid obtained from the centrifugal separator 10 is used as the driving fluid for the ejector 32, and the centrifugal separator 10 is driven to suck the bubbles B1 and the sludge B2. Thus, there is an advantage that the bubbles B1 and the sludge B2 from the sludge tank 20 can be sucked at the same time.
Further, in order to use the second coolant liquid obtained by the centrifugal separator 10 as the driving fluid for the ejector 32, the coolant liquid is supplied to the thickener back filter 40 from the connection line between the clean tank 50 and the thickener back filter 40 and the clean tank 50. Since there is no need to install a delivery pump for delivery, there is an advantage that the equipment can be downsized.

[Third Embodiment]
Next, a third embodiment of the coolant purification device will be described. In the following, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof is omitted.

  In the third embodiment described below, the storage tank is only the receiving tank. That is, the third embodiment differs from the first embodiment in that the clean tank 50 and the dirty tank 60 are not provided, and the coolant liquid storage tank is only the sludge tank 20. Specifically, as shown in FIG. 4, the coolant purification apparatus 1 b according to the third embodiment includes a centrifuge 10, a sludge tank 20, a suction mechanism 30, and a thickener back filter 40.

  In the third embodiment, since the clean tank 50 and the dirty tank 60 in the first embodiment are not provided, the filtered coolant liquid stored in the clean tank 50 in the first embodiment is directly supplied to the machine tool M / C. In the first embodiment, the coolant liquid after use is directly introduced into the centrifugal separator 10 by the machine tool M / C stored in the dirty tank 60.

  That is, in the coolant purification apparatus 1b, the post-filtration pipe 43b for sending the post-filtration coolant liquid after the bubbles B1 and sludge B2 are removed by the thickener back filter 40 is connected to the machine tool M / C instead of the clean tank 50, The post-use pipe 71b for sending the used coolant liquid in the machine tool M / C is connected to the centrifuge 10 instead of the dirty tank 60.

  Further, since the coolant purification device 1b does not include the clean tank 50, the first coolant stored in the sludge tank 20 is passed through the ejector 32. That is, in the coolant purification apparatus 1b, the coolant supply path 34Bb is a pipe connecting the sludge tank 20 and the thickener back filter 40. Further, the filtering coolant liquid delivery pump 35 b serves as a coolant liquid delivery means from the sludge tank 20 to the thickener back filter 40.

  The suction mechanism 30 is configured so that when the first coolant liquid sent from the sludge tank 20 to the thickener back filter 40 flows through the ejector 32, the negative pressure generated in the ejector 32 causes bubbles B1 near the sludge tank liquid surface and The sludge B2 contained in the bubbles B1 is sucked from the suction port 31, and the sucked bubbles B1 and sludge B2 are mixed with the first coolant liquid flowing through the ejector 32 and discharged to the thickener back filter 40 as discharge coolant liquid. It is configured.

  According to the coolant liquid purification apparatus 1b described above, since only the sludge tank 20 is required as a necessary tank, there is an advantage that the apparatus volume can be reduced as compared with the coolant liquid purification apparatus 1.

  The sludge tank 20 and the coolant liquid supply path 34Bb are preferably connected at the height of the intermediate portion of the sludge tank 20. This is because a relatively clean coolant liquid is expected to be stored in the intermediate portion of the sludge tank 20. Since the coolant liquid supplied from the sludge tank 20 is also introduced into the thickener back filter 40 as a component of the discharged coolant liquid, the thickener back filter 40 lasts longer when the coolant liquid used for mixing is clean.

[Fourth Embodiment]
Next, a fourth embodiment of the coolant purification device will be described. In the following, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof is omitted.

  The fourth embodiment includes a purification target processing liquid storage tank that stores a processing target liquid to be purified including sludge, and a centrifugal separation that is a processing liquid purification equipment for the purification target processing liquid stored in the purification target processing liquid storage tank. A configuration to be introduced into the vessel 10 is provided. That is, the coolant purifying apparatus 1c according to the fourth embodiment shown in FIG. 5 does not introduce the coolant liquid after use in the machine tool M / C directly into the centrifuge 10 but temporarily stores it in the sludge tank 20, and then performs centrifugation. It differs from the first embodiment in that it is introduced into the vessel 10. Accordingly, the fourth embodiment differs from the first embodiment in the coolant liquid discharge destination used in the machine tool M / C and the configuration for introducing the coolant liquid into the centrifuge 10.

Specifically, the coolant purification apparatus 1c is configured by the centrifugal separator 10, the sludge tank 20, the suction mechanism 30, and the thickener back filter 40, and the configurations of the suction mechanism 30 and the thickener back filter 40 are the first implementation. It is the same as the form.
However, in the coolant liquid purification apparatus 1c, the coolant liquid after being used by the machine tool M / C is not directly introduced into the centrifuge 10 but is temporarily stored in the sludge tank 20 which is a process target liquid storage tank, and then the process liquid It is comprised so that it may introduce into the centrifuge 10 which is a purification equipment. That is, in the coolant liquid purification apparatus 1c, the post-use pipe 71c that sends out the coolant liquid after being used by the machine tool M / C connects the machine tool M / C and the sludge tank 20 that is the purification target treatment liquid storage tank. Yes. In addition, the coolant liquid purification apparatus 1c is configured to send the coolant liquid stored in the sludge tank 20 to the centrifuge 10, and includes a sludge-containing liquid pipe 73c that connects the sludge tank 20 and the centrifuge 10; And a stored coolant liquid delivery pump 72c for delivering the coolant liquid stored in the sludge tank 20 to the centrifuge 10 through the sludge-containing liquid pipe 73c.

  Based on such a configuration, in the coolant purifier 1c, the coolant liquid after use in the machine tool M / C is discharged and stored in the sludge tank 20 through the post-use pipe 71c. Then, the coolant liquid to be purified is sent from the sludge tank 20 to the centrifuge 10 by the stored coolant liquid delivery pump 72c and the sludge containing liquid pipe 73c. The purification process after the coolant liquid to be purified is sent to the centrifuge 10 is the same as that of the first embodiment.

  According to the coolant liquid purification apparatus 1c described above, since only the sludge tank 20 is required for the purification apparatus, the volume of the apparatus can be reduced as compared with the first embodiment, and the coolant liquid to be purified is temporarily stored in the sludge tank. Therefore, in the sludge tank 20, there is an advantage that purification by buffering the coolant and sludge precipitation can be expected.

[Fifth Embodiment]
Next, a fifth embodiment of the coolant purification device will be described. In the following, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof is omitted.

  The fifth embodiment described below is different from the fourth embodiment in that the purification target treatment liquid storage tank referred to in the fourth embodiment is a tank different from the receiving tank. That is, the coolant liquid purification apparatus 1d according to the fifth embodiment shown in FIG. 6 includes a dirty tank 60 (purification target treatment liquid storage tank) that stores the post-use coolant liquid to be purified separately from the sludge tank 20. Different from the second embodiment and the fourth embodiment.

  Further, the coolant purification apparatus 1d according to the fifth embodiment is configured such that the used coolant liquid is stored in the dirty tank 60, and the used coolant liquid is introduced from the dirty tank 60 to the centrifuge 10. This is different from the third and fourth embodiments.

  Based on such a configuration, the coolant purification apparatus 1d discharges and stores the used coolant liquid to the dirty tank 60 through the used pipe 71d. Thereafter, the used coolant liquid to be purified is sent from the dirty tank 60 to the centrifuge 10 by the stored coolant liquid delivery pump 72d and the sludge-containing liquid pipe 73d. The processing after sending the used coolant liquid to be purified to the centrifuge 10 is the same as in the third embodiment and the fourth embodiment.

According to the coolant purification apparatus 1d according to the fifth embodiment described above, the used coolant liquid is stored in the dirty tank 60 different from the sludge tank 20, and is stored in the dirty tank 60 in the centrifugal separator 10. Introduce coolant after use.
With such a configuration, the coolant liquid purification apparatus 1d introduces only the post-use coolant liquid that is the original purification target, and therefore the coolant liquid purification apparatus 1c that introduces the mixed liquid of the post-use coolant liquid and the first coolant liquid. In comparison, the introduction of the first coolant liquid into the centrifuge 10 again can be avoided, and a highly efficient purification process can be expected.
In addition, since the coolant liquid after use is not directly introduced into the centrifuge 10 but is stored in the dirty tank 60, the dirty tank 60 functions as a buffer, and sludge is precipitated and separated in the dirty tank 60, so that the post-use coolant is used. We can expect purification of liquid.

[Another embodiment]
(1) In the above-described embodiment, the structure including the suction port fixed at a predetermined height as the suction mechanism has been shown. However, the first coolant liquid stored in the sludge tank can be floated and the liquid level fluctuates. It is good also as a structure which attracts | sucks the sludge which the foam near the liquid level of a sludge tank and the foam contain by the suction port which provided the buoyancy means (float) which follows. The structure of the suction mechanism using such buoyancy means is particularly useful when no overflow occurs from the sludge tank.

(2) In each of the above embodiments, the example in which the suction mechanism 30 includes the ejector 32 has been described. However, the ejector 32 may be omitted as long as it is configured to suck bubbles and sludge contained in the bubbles.
For example, the suction mechanism 30 includes a merging pipe line that simply connects the suction port 31 and the coolant liquid supply path 34B, and a pump that is disposed downstream of the merging point of the suction port 31 and the coolant liquid supply path 34B. And it is good also as a structure which carries out mixing suction of a foam and sludge from a coolant liquid and a receiving tank liquid level by driving a pump.

(3) In each of the above embodiments, the example in which the coolant liquid is supplied from the clean tank 50, the centrifuge 10 or the sludge tank 20 to the ejector 32 has been shown, but the supply source of the coolant liquid is not limited to this configuration. Absent.
That is, as long as the coolant liquid that can be used in the machine tool M / C can be supplied after the mixed suction by the suction mechanism 30 and the purification by the thickener back filter 40, the supply is made from another tank or another supply source. May be.

(4) Although the example which comprises the filtering means using the thickener back filter was shown above, the filtering means may be configured so as to be able to defoam the discharged processing liquid and remove sludge contained in the foam. For example, a configuration using a filter or a thin film may be used.

(5) In FIGS. 1 and 3 to 6 showing the above embodiments, an example in which the coolant coolant delivery pump 35 for filtration is arranged upstream of the ejector 32 is shown, but the coolant coolant delivery pump 35 for filtration is a coolant fluid supply path. It may be arranged so that the coolant can be delivered to the filtering means through 34B, and the arrangement position does not matter whether it is upstream or downstream of the suction means.

  ADVANTAGE OF THE INVENTION According to this invention, even when processing liquids, such as a highly foamable coolant, are used, the processing liquid purification apparatus which can remove the sludge of comparatively small specific gravity reliably and can purify a processing liquid appropriately can be provided.

1, 1a, 1b, 1c, 1d Treatment liquid purification device 10 Centrifuge 20 Sludge tank (receiving tank)
32 Ejector (suction means)
40 Thickener back filter (filtering means)
35, 35a, 35b, 35c Coolant liquid feed pump for filtration (liquid feed means)
50 Clean tank B1 Foam B2 Sludge M / C Machine tool

Claims (4)

Centrifugation that receives a treatment liquid to be purified, including sludge, and centrifuges into a first treatment liquid that has more sludge components than the treatment liquid to be purified and a second treatment liquid that has less sludge components than the treatment liquid to be purified A separator,
A receiving tank for receiving the first treatment liquid;
Suction means for mixing and sucking the foam on the liquid level of the processing liquid in the receiving tank together with the processing liquid;
Receiving a discharge treatment liquid discharged from the suction means, and filtering means for filtering the discharge treatment liquid,
A treatment liquid purification apparatus for obtaining a treatment liquid filtered by the filtration means as a post-filtration treatment liquid.   The processing liquid purification apparatus according to claim 1, wherein the suction unit includes an ejector that causes the processing liquid to flow through the throttle unit and sucks the bubbles into a suction unit that communicates with the throttle unit. A clean tank for storing the second treatment liquid or the post-filtration treatment liquid is provided separately from the receiving tank,
3. The treatment liquid purification according to claim 1, further comprising a liquid feeding unit that sends the treatment liquid stored in the clean tank to the filtration unit, and the suction unit is provided between the clean tank and the filtration unit. apparatus.   The processing-liquid purification apparatus as described in any one of Claims 1-3 with which the said filtration means is provided with a thickener back filter.

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