JP6865938B1 - Impurity remover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To regenerate an aqueous liquid containing solid impurities and oily impurities and to regenerate a filter medium in parallel. SOLUTION: A filtration tank unit 10 for filtering an aqueous liquid containing solid impurities and oily impurities under reduced pressure so as to adhere to a filter paper 200, a sludge tank unit 20 for removing solid impurities from the filter paper 200, and an aqueous liquid containing oily impurities are hydrophilic. The two-phase separation unit 40, which is separated and removed by the oil-repellent filter 41, and the filter paper 200, which has passed through the sludge tank unit 20, are continuously run along the outer circumference of the rotating drum whose inside is depressurized to contain no solid impurities or oily impurities. A backwash tank unit 30 that reversely cleans under reduced pressure with an aqueous liquid, a chamber unit 70 that receives the aqueous liquid that has passed through the filter paper 200 in the backwash tank unit 30 and circulates it in the backwash tank unit 30, and a filter paper 200 that is fed out from the original roll. It is provided with a filter material traveling means for continuously traveling the tank units 10, 20, and 30 in this order. [Selection diagram] Fig. 1

Description

The present invention relates to an impurity removing device capable of removing solid impurities and oily impurities from an aqueous liquid.

In grinding by a grinding machine tool such as a grinding machine that grinds steel materials using a grindstone, a coolant is supplied to prevent seizure and discoloration of the work surface of the workpiece. The coolant liquid after grinding contains chips that are grinding chips, solids such as abrasive grains exfoliated from the grindstone (hereinafter, these are collectively referred to as sludge), and impure oil such as lubricating oil and rust preventive oil. There is. Continued use of the coolant causes a decrease in grinding accuracy and, in turn, a decrease in the processing quality of the workpiece.

Therefore, the grinding machine tool is provided with sludge removal equipment for separating and removing solids such as sludge contained in the coolant liquid, and oil-water separation equipment for removing impure oil.

The reference numerals used in the following description of Patent Documents 1-5 are the reference numerals used in the respective patent documents.

The cutting fluid filtration device shown in Patent Document 1 includes a filtration tank (tank body) 1, a narrow inflow portion 2 on the right side and a narrow inflow portion 2 on the left side, in which the inside of the filtration tank 1 is partitioned by a partition plate 4 and the bottoms communicate with each other. A wide filtration unit 3, an endless discharge conveyor 14 provided along the left side wall of the tank from the bottom of the filtration unit 3, and a plurality of excellent plates (inclined plates) arranged on the discharge conveyor 14. 12. It has an endless screen belt filter medium 27 provided on the upper side of the cross plate 12 and running endlessly, and an overflow port 9 provided between the lower running portion and the upper running portion of the screen belt filter medium 27. ..

According to this filtration device, the liquid to be treated flows into the filtration part 3 from the inflow part 2, and the inclined space formed by the plurality of cutting plates 12 is rectified and raised, and in this process, the liquid to be treated is contained in the liquid to be treated. The coarse-grained cutting chips of No. 1 are settled (primary separation), and the cutting chips are slid down on the double plate 12 and received on the endless traveling discharge conveyor 14 provided along the left side surface from the inner bottom surface of the filtration tank 1. It is conveyed to the folded-back portion 14a, scraped off by the scraper 15, and collected in the slurry box 16.

Further, according to this filtration device, the liquid to be treated that has passed through the double plate 12 is passed through the lower traveling portion of the screen belt filter medium 27, and at this time, fine-grained cutting chips are captured by the screen belt filter medium 27 (2). Next separation), and the purified liquid to be treated overflows from the discharge port 9. When the filtration is repeated, the mesh holes of the screen belt filter medium 27 are clogged with fine-grained cutting chips and the filter accuracy is lowered. Therefore, in order to remove the cutting chips, the screen belt filter medium 27 is brushed with the brush roller 40 at the time of non-filtration, and vice versa. The washing nozzle 39 sprays the purifying liquid onto the back surface of the screen belt filter medium 27.

In the continuous filtration device shown in Patent Document 2, the filtration filter 4 drawn out from the roll body 3 is wound around the outer peripheral surface of the filtration drum 10 via the supply roller 20, and then the pollution tank is passed through the discharge roller 30. The pollutant liquid 1 is guided to the outside of No. 2 and is moved by continuously winding the filtration filter 4 around the filtration drum 10 by rotating the filtration drum 10 and the discharge roller 30 due to the negative pressure of the vacuum pump 5. The solid matter and the purification liquid can be separated, and the solid matter adhering to the filtration filter 4 can be collected together with the filtration filter 4 in the collection container 70. The used filtration filter 4 is incinerated with solid matter attached.

In the filter device 50 according to the first embodiment shown in Patent Document 3, a filter unit 20 formed by stretching a plurality of fiber threads 100 between a pair of filtration plates (mesh plates) 21 and 22 allows a liquid to flow. A filtration chamber 11 arranged in the flow path is provided, and the filtration plate 21 is moved by the operation shaft 23 at the time of filtration, the distance between the pair of filtration plates 21 and 22 is narrowed, and a plurality of fiber threads 100 are in a compressed state to be in a compressed state. This is a device that filters a liquid with a fiber thread 100 and captures and removes fine substances mixed in the liquid.

The fiber yarn 100 in the compressed state may cause clogging in order to capture and remove fine substances. For this purpose, the liquid is flowed from the flow path 1a on one side to the flow path 1b on the other side, and the liquid is flown from the flow path 1b on the other side to the flow path 1a on the one side. The filtration plate 21 is moved by the operation shaft 23, the space between the pair of filtration plates 21 and 22 is widened to release the compressed state of the plurality of fiber threads 100, and the fiber threads 100 are washed.

The filter unit 20 of the filter device 50 according to the seventh embodiment shown in Patent Document 3 has a plurality of fiber threads stretched between a pair of filtration plates 21 and 22 stepwise from the outside toward the center side. The diameter of 100 is reduced, the liquid is supplied from the outside, filtered, and the filtered liquid is discharged from the center side. In addition, by arranging two or more types of fiber yarns with different functions on the outside and inside, it is possible to handle various filtrations with one element, for example, oil-water separation (oil adsorption) from the outside to remove solids. And can be decolorized.

The coolant purifier shown in Patent Document 4 includes a first tank 21 that stores the coolant and separates the sludge remaining in the coolant from the coolant, and adsorbs the sludge on the sludge remaining in the coolant 21 to cool the coolant. For the microbubble generator 23 that generates microbubbles to float on the liquid surface in the first tank 21 and the first tank that collects the residual sludge near the coolant liquid level filtered in the first tank 21 together with the coolant. It is provided with a recovery device 31 and a filter device 41 that removes residual sludge from the coolant recovered by the recovery device 31 for the first tank and returns the coolant separated from the residual sludge to the first tank.

The grinding sludge separating device shown in Patent Document 5 is arranged in a separating tank (4) to which the grinding fluid (L) containing the grinding sludge (S) is supplied and in the separating tank (4), and is arranged on the upper surface. A non-magnetic plate (5) that causes the grinding sludge (S) to settle due to magnetic attraction and its own weight, and a non-magnetic plate (5) that is arranged on the back surface of the non-magnetic plate (5) and magnetically mounted on the surface of the non-magnetic plate (5). It is equipped with a magnetic conveyor (6) that sucks the grinding sludge (S) with a large attractive force and moves it in the discharge direction, and collects the floating grinding sludge (FS) floating on the liquid surface with the collecting means (21). It is equipped with a floating grinding sludge collecting means (22) for immersing the floating grinding sludge (FS) in the grinding fluid (L) and pulling it up, and a condensing means (30) for condensing the pulled up grinding sludge. A method is adopted in which sludge mixed in a grinding liquid such as liquid or grinding oil is settled by magnetic attraction and its own weight.

Japanese Unexamined Patent Publication No. 58-170511 Japanese Unexamined Patent Publication No. 2006-305430 Japanese Unexamined Patent Publication No. 2016-87519 Japanese Unexamined Patent Publication No. 2013-163249 Japanese Patent No. 5479046

When the present inventor measured the particle size distribution of sludge contained in the coolant liquid after using it in a grinding machine tool, it was found that the particle size of the sludge mixed in the coolant liquid was approximately 1 μm or more.

However, since it is difficult to remove sludge having a fine particle size of about 1 μm to several μm by the conventional method of sedimenting by magnetic attraction or its own weight, the present inventor has a reserved particle size of 1 μm to several μm. A method of filtering the coolant liquid using a filter paper of about μm was examined.

However, if it is attempted to filter the sludge in the coolant liquid using a filter paper having a reserved particle size of about 1 μm to several μm, the filtration takes a long time, which causes a problem that the workability of sludge removal is lowered.

In addition, in the sludge removal method that generally uses a filter paper as a filter material, the filter paper must be discarded by using it only once due to clogging of the filter paper, so that the maintenance time is increased due to the trouble of frequently changing the filter paper, and the filter paper cost is increased. There is also the problem of causing an increase and an increase in environmental load.

Further, the coolant liquid after being used in the grinding machine tool contains impure oil (lubricating oil, rust preventive oil, etc.) in addition to solid matter such as sludge. Therefore, in order to return the dirty coolant to a clear coolant and reuse it, a facility for removing impure oil is required in addition to the sludge removing device, so that there is also a problem that the facility becomes large.

Furthermore, with the separation method (centrifugation, liquid cyclone, magnet separation, etc.) adopted by conventional filtration devices, it is difficult to efficiently separate fine sludge of about 1 to several μm, and sludge that could not be collected can be collected. Since it gradually precipitates at the bottom of the tank, there is also a problem that frequent tank cleaning work, frequency of coolant liquid replacement, and machine stop due to replacement work are required.

The filtration device shown in Patent Document 1 brushes the screen belt filter medium 27 with a brush roller 40 at the time of non-filtration, and sprays a purifying liquid onto the back surface of the screen belt filter medium 27 with a backwash nozzle 39 to spray the screen belt filter medium 27. Although the mesh holes of the screen belt filter medium 27 are designed to eliminate clogging due to fine-grained cutting chips, the purification liquid cannot be sprayed uniformly and evenly. Therefore, the ratio of clogging of the mesh holes of the screen belt filter medium 27 There is a problem that the amount of filtration gradually increases and the filtration efficiency decreases. If the screen belt filter medium 27 can be replaced regularly, this problem can be solved. However, since the screen belt filter medium 27 is irreplaceable or extremely difficult to replace in the filtration device, this problem should be solved. I can't.

The present invention has been made to solve the above-mentioned problems, and the filter medium is unwound from the raw fabric roll, used for filtration, and then reused in a state where the mesh holes are cleared by backwashing under reduced pressure. To provide an impurity removing device capable of removing solid impurities and oily impurities from an aqueous liquid by using this filter material and an oil-based impurity separation filter in combination while being able to wind up as a possible raw material roll. is there.

The impurity removing device according to the first aspect of the present invention includes a filtration tank unit that filters an aqueous liquid containing solid impurities and oily impurities under reduced pressure with a filter medium to remove the solid impurities from the aqueous liquid, and the filtration tank unit. The sludge tank unit for removing the solid impurities adhering to the filter material from the filter material and the aqueous liquid containing the oil-based impurities that have passed through the filter material in the filter tank unit are filtered by a hydrophilic oil-repellent filter, and the above-mentioned The two-phase separation unit for removing the oily impurities from the aqueous liquid and the filter medium from which the solid impurities have been removed by the sludge tank unit are passed through the hydrophilic oil-repellent filter of the two-phase separation unit with the aqueous liquid. A backwash tank unit for backwashing under reduced pressure, a chamber unit for circulating and sending the aqueous liquid that has passed through the filter material in the backwash tank unit to the backwash tank unit for the backwash under reduced pressure, and the filter medium. The filter medium traveling means is provided, which is fed out from the original roll, travels from the filtration tank unit through the sludge tank unit, travels in the backwash tank unit, and is wound as another reusable original roll.

In the impurity removing device according to the second aspect of the present invention, in the first aspect, the aqueous liquid is an aqueous coolant liquid used in a machine tool.

In the impurity removing device according to the third aspect of the present invention, in the second aspect, the aqueous liquid is sent from the machine tool to the impurity removing device, and the solid impurities are removed by the filtration tank unit. After the oil-based impurities are removed by the two-phase separation unit, water is circulated and sent to the machine tool.

In the impurity removing device according to the fourth aspect of the present invention, in any one of the first to third aspects, the filtration tank unit includes a rotating drum whose inside is depressurized, and the outer periphery of the rotating drum is provided. The solid impurities are removed from the aqueous liquid by passing the aqueous liquid from the outside to the inside of the rotating drum through the filter medium that continuously travels along the water.

In the impurity removing device according to the fifth aspect of the present invention, in any one of the first to fourth aspects, the backwash tank unit includes a rotating drum whose inside is depressurized. The filter medium is backwashed by passing the aqueous liquid from the outside to the inside of the rotary drum through the filter medium that continuously travels along the outer circumference.

In the impurity removing device according to the sixth aspect of the present invention, in any one of the first to fifth aspects, the aqueous liquid is said to be passed through a sludge pot having a conical cross section provided in the filtration tank unit. It is supplied into the filtration tank unit.

In the impurity removing device according to the seventh aspect of the present invention, in any one of the first to sixth aspects, the aqueous liquid is passed through a sludge pot having a conical cross section provided in the backwash tank unit. It is supplied from the chamber unit into the backwash tank unit.

In the impurity removing device according to the eighth aspect of the present invention, in any one of the first to seventh aspects, the hydrophilic oil repellent filter is housed in the two-phase separation unit in a vertically standing state. ..

In the impurity removing device according to the ninth aspect of the present invention, in any one of the first to eighth aspects, the reserved particle size of the filter medium is 1 μm to several hundred μm.

In the ninth aspect of the impurity removing device according to the tenth aspect of the present invention, the reserved particle size of the filter medium is 1 μm to several tens of μm.

In any one of the first to tenth aspects, the impurity removing device according to the eleventh aspect of the present invention has the aqueous backwash tank unit in the middle of the piping path for sending the aqueous liquid to the filtration tank unit. A fine bubble generator for generating bubbles having a diameter of 100 μm or less is provided at least one place in the middle of the path for circulating the liquid and in the middle of the path for sending the clear coolant liquid to the machine tool.

In the fourth aspect of the present invention, the impurity removing device according to the twelfth aspect of the present invention is a filtration decompression column in which the rotating drum of the filtration tank unit is provided with a plurality of ventilation holes on an arcuate outer peripheral portion. Is built-in, and the portion of the outer peripheral portion of the rotating drum that comes into contact with the filter material and the arc-shaped outer peripheral portion of the filtration pressure reducing column are arranged so as to overlap each other.

The impurity removing device according to the thirteenth aspect of the present invention is for backwashing in which, in the first aspect, the rotary drum of the backwashing tank unit is provided with a plurality of vent holes on an arcuate outer peripheral portion. A pressure reducing column is built in, and the portion of the outer peripheral portion of the rotating drum that comes into contact with the filter material and the arcuate outer peripheral portion of the backwashing pressure reducing column are arranged so as to overlap each other.

In any one of the first to thirteenth aspects, the impurity removing device according to the fourteenth aspect of the present invention runs the filter material inside the filtration tank unit and inside the backwash tank unit. A guide roller for guiding is housed, and the surface of the guide roller is composed of a porous body that absorbs water.

According to the present invention, the filter material can be unwound from the raw fabric roll, used for filtration, and then wound up as a reusable raw fabric roll in a state where the mesh holes are cleared of clogging by backwashing under reduced pressure. By using the filter material and the oil-based impurity separation filter in combination, it is possible to provide an impurity removing device capable of removing solid impurities and oil-based impurities from the aqueous liquid.

It is a figure which shows the whole structure of the impurity removal apparatus which concerns on one Embodiment of this invention. It is a figure which shows the whole structure of the impurity removal apparatus which concerns on one Embodiment of this invention. It is a figure which shows the traveling path of the filter material attached to the impurity removing apparatus which concerns on one Embodiment of this invention. It is a piping diagram which shows the path of the coolant liquid in the impurity removal apparatus which concerns on one Embodiment of this invention. FIG. 5 is an external perspective view of a filtration tank unit provided in the impurity removing device shown in FIG. 1. It is a perspective view which shows the internal structure of the filtration tank unit shown in FIG. It is a perspective view which shows the internal structure of the rotary drum for filtration provided in the filtration tank unit shown in FIG. FIG. 5 is an external perspective view of a sludge tank unit provided in the impurity removing device shown in FIG. 1. FIG. 5 is an external perspective view of a sludge tank unit provided in the impurity removing device shown in FIG. 1. It is a perspective view which shows the internal structure of the two-phase separation unit provided in the impurity removal apparatus shown in FIG. It is a perspective view which shows the internal structure of the backwash tank unit provided in the impurity removal apparatus shown in FIG. It is a perspective view which shows the internal structure of the reverse cleaning rotary drum provided in the reverse cleaning tank unit provided in the impurity removing apparatus shown in FIG. FIG. 3 is an external perspective view of a chamber unit provided in the impurity removing device shown in FIG. 1. It is a piping diagram which shows the path of the coolant liquid in the impurity removal apparatus which concerns on another Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, the range necessary for the explanation for achieving the object of the present invention will be schematically shown, and the range necessary for the explanation of the relevant part of the present invention will be mainly described. It shall be based on a known technique.

(Embodiment 1)
The impurity removing device of the present embodiment is connected to a machine tool such as a surface grinding machine via a connecting hose, and has solid content (sludge, etc.) and impure oil content in the coolant liquid used in the machine tool. It is a device that removes impurities, regenerates the clear coolant, and returns it to the machine tool. The coolant liquid here is assumed to be an aqueous coolant liquid (coolant liquid used by diluting the stock solution with water) generally used in the machine tool field.

1 and 2 are views showing the overall configuration of the impurity removing device according to the present embodiment, and FIG. 3 is a view showing a traveling path of the filter paper attached to the impurity removing device shown in FIGS. 1 and 2. 4 is a piping diagram showing the path of the coolant liquid in the impurity removing device shown in FIGS. 1 and 2.

As shown in FIGS. 1 and 2, the impurity removing device 100 includes a filtration tank unit 10, a sludge tank unit 20, a backwash tank unit 30, a two-phase separation unit 40, a filter paper supply unit (filter material traveling means) 50, and filter paper. It includes a take-up unit (filter material traveling means) 60, a chamber unit 70, a water supply pump 80A and a vacuum pump 80B for supplying coolant, a power distribution board 81, a frame 82 for supporting them, and the like.

The filter paper 200 wound in a roll shape is mounted on the reel 51 of the filter paper supply unit 50. As shown in FIG. 3, the filter paper 200 drawn from the reel 51 is wound on the reel 61 of the filter paper winding unit 60 via the filtration tank unit 10, the sludge tank unit 20, and the backwash tank unit 30.

The particle size of sludge contained in the coolant used in the machine tool is approximately 1 μm to several hundred μm. Therefore, the preferred particle size of the filter paper 200 used in the impurity removing device 100 is 1 μm to several hundred μm, more preferably 1 μm to several tens of μm, and further preferably 1 μm. Further, instead of the filter paper (paper filter material) 200, a filter material such as a filter cloth (including a bag-shaped one) having the same holding particle size as the above can be used.

Hereinafter, the configuration of the impurity removing device 100 and the sludge removing step using the impurity removing device 100 will be described in detail.

An operator who operates and manages the impurity removing device 100 manually pulls out the tip portion of the roll-shaped filter paper 200 mounted on the reel 51 of the filter paper supply unit 50 in advance, and pulls out the tip portion of the filtration tank unit 10 and the sludge tank unit 20. And, it is wound on the reel 61 of the filter paper winding unit 60 via the backwash tank unit 30.

When the impurity removing device 100 is operated, the filter paper 200 is continuously driven by a total of two motors (not shown) provided in the filter paper supply unit 50 and the filter paper winding unit 60, respectively, and the filtration tank is controlled to an appropriate tension and speed. It is sent to unit 10.

By controlling the filter paper 200 during traveling to the optimum tension and speed, the generation of excessive tension on the filter paper 200 is prevented, and the filter paper 200 can be stably traveled. The tension and running speed of the filter paper 200 can be arbitrarily adjusted depending on the coolant liquid and the degree of contamination of the filter paper 200.

<Filtration process>
FIG. 5 is an external perspective view of the filtration tank unit 10, and FIG. 6 is a perspective view showing the internal structure of the filtration tank unit 10.

When the impurity removing device 100 is operated, the contaminated coolant containing solids and impure oil is sent from the coolant tank of the machine tool to the impurity removing device 100 by the water supply pump 80A, and the cross section provided at the bottom of the filtration tank unit 10 is formed. It is stored inside the filtration tank unit 10 through the conical sludge pot 12.

An ejector 83 (see FIG. 4) is incorporated in a water supply path for sending the contaminated coolant liquid from the machine tool to the impurity removing device 100. When the contaminated coolant passes through the ejector 83, a negative pressure is generated in the ejector 83. Therefore, by merging this negative pressure with the negative pressure generated by the vacuum pump 80B, it is used for vacuum filtration in the main filtration process. Negative pressure can be increased and filtration efficiency can be increased.

The contaminated coolant liquid that has flowed into the sludge pot 12 flows in a vortex shape along the conical inner wall. Therefore, among the solids in the contaminated coolant that collide with the inner wall of the sludge pot 12 due to centrifugal force, the large solids settle on the bottom of the sludge pot 12 due to their own weight. As a result, the large solid content can be separated in advance prior to the filtration treatment step by the filter paper 200, so that the load and damage of the filter paper 200 can be reduced. The solid content settled on the bottom of the sludge pot 12 is periodically discarded.

A rotating drum 11 for filtration, liquid level detection sensors 14a and 14b, and guide rollers 16 and 17 for guiding the traveling of the filter paper 200 are housed in the filtration tank unit 10. The rotary drum 11 for filtration is a cylindrical container in which a plurality of suction holes 15 through which the contaminated coolant liquid passes are arranged along the outer peripheral portion, and rotates in synchronization with the running of the filter paper 200.

The filter paper 200 is wound around the outer peripheral portion of the rotating drum 11 for filtration at a constant angle and travels. Therefore, in the outer peripheral portion of the rotary drum 11 for filtration, where it is not in contact with the filter paper 200, the contaminated coolant liquid or unnecessary air directly flows into the rotary drum 11 for filtration without passing through the filter paper 200. ..

As a countermeasure, as shown in FIG. 7, the rotating drum 11 for filtration has a built-in decompression column 13 for filtration.

The inside of the decompression column 13 for filtration is decompressed by the vacuum pump 80B, and the vent holes 18 are provided only in the outer peripheral portion having an arc shape. Further, of the outer peripheral portion of the rotary drum 11 for filtration, the portion in contact with the filter paper 200 and the arcuate outer peripheral portion of the decompression column 13 for filtration are arranged so as to overlap each other. Further, the gap between the inner peripheral surface of the rotary drum 11 for filtration and the decompression column 13 for filtration is sealed by a sealing material (not shown) so that contaminated coolant and unnecessary air do not flow into the rotary drum 11 for filtration. It has a structure.

Therefore, as for the contaminated coolant liquid in the filtration tank unit 10, only the contaminated coolant liquid that has passed through the filter paper 200 is sucked into the filtration decompression column 13 through the ventilation holes 18. On the other hand, solid content such as sludge contained in the contaminated coolant adheres to the filter paper 200 wound around the rotating drum 11 for filtration.

Since the coolant liquid sucked under reduced pressure in the filtering decompression column 13 of the rotating drum 11 for filtration contains an impure oil component, it is sent to the two-phase separation unit 40 described later through a pipe (not shown).

In this way, by filtering the contaminated coolant under reduced pressure using the filter paper 200 having a small reserved particle size, efficient filtration that is difficult with the natural filtration method under atmospheric pressure becomes possible, and most of the contaminated coolant is contained. The solid content can be removed in a short time.

Bacteria that cause offensive odors are also mixed in the used contaminated coolant sent from the machine tool, but since the size of the bacteria is about 1 μm, they are mixed in the contaminated coolant. Bacteria are also collected by the filter paper 200 running in the filtration tank unit 10.

The solid content adhering to the filter paper 200 is removed from the filter paper 200 by a sludge removing step and a backwashing step described later, but when the regenerated filter paper 200 is repeatedly used, fine solid content accumulates inside the filter paper 200. This causes clogging, and the filtration performance of the filter paper 200 gradually deteriorates.

Therefore, the filtration tank unit 10 is equipped with a pressure sensor (not shown) that detects the internal pressure of the rotating drum 11 for filtration and monitors the regeneration limit of the filter paper 200. When these pressure sensors detect an increase in pressure in the rotating drum 11 for filtration due to clogging of the filter paper 200, the impurity removing device 100 stops operating and prompts the replacement of the filter paper 200.

The filter paper 200 to which the solid content has adhered in this filtration treatment step is guided by the guide roller 17 and sent to the sludge tank unit 20 adjacent to the filtration tank unit 10.

The filter paper 200 sent from the filtration tank unit 10 to the sludge tank unit 20 contains not only solid content but also water (coolant liquid). However, the filter paper 200 containing a large amount of water tends to wrinkle during traveling and the traveling becomes unstable.

Therefore, the guide roller 17 is provided with a moisture management mechanism for appropriately managing the moisture contained in the filter paper 200. Specifically, the surface of the guide roller 17 is a porous body, and when the filter paper 200 is pressed against the guide roller 17, a part of the water contained in the filter paper 200 is absorbed by the porous body. ing. Further, the water absorbed by the porous body is discharged to the outside through the rotation shaft of the guide roller 17. Since the guide roller 17 comes into contact with the surface of the filter paper 200 to which the solid content has not adhered (see FIG. 6), the solid content adhering to the filter paper 200 does not adhere to the surface of the guide roller 17.

By removing a part of the water contained in the filter paper 200 through the guide roller 17 in this way, it is possible to suppress the generation of wrinkles in the filter paper 200 due to the excessive water content and allow the filter paper 200 to run stably. This moisture management mechanism is provided not only on the guide roller 17 located downstream of the filtration rotary drum 11, but also on the guide roller 16 located upstream of the filtration rotary drum 11.
<Sludge removal process>
8 and 9 are external perspective views of the sludge tank unit 20. The sludge tank unit 20 accommodates a roll-shaped brush 21 that is rotated in the direction opposite to the traveling direction of the filter paper 200 by a gear train mechanism (not shown), and guide rollers 22 and 23 that guide the traveling of the filter paper 200. There is. Further, a sludge disposal tank 24 that can be manually taken in and out is housed in the bottom of the sludge tank unit 20.

The filter paper 200 sent from the filtration tank unit 10 to the sludge tank unit 20 is pressed against the surface of the brush 21 by the guide rollers 22 and 23. As a result, of the solid content adhering to the filter paper 200, the solid content adhering to the surface portion of the filter paper 200 is scraped off by the brush 21. The rotation speed and rotation direction of the brush 21 are appropriately adjusted according to the amount of solid content adhering to the surface of the filter paper 200.

The solid content scraped from the surface of the filter paper 200 falls into the sludge disposal tank 24 below the brush 21. The sludge disposal tank 24 is periodically pulled out by an operator (see FIG. 9), and the solid content accumulated inside is transported to a predetermined disposal site.

In this way, solids such as sludge adhering to the surface portion of the filter paper 200 are removed in the sludge tank unit 20, but fine solids still remain on the surface portion and the inside (inner layer) of the filter paper 200. ing. Therefore, when the filter paper 200 is repeatedly used in the impurity removing device 100, the filter paper 200 causes clogging in the filtration treatment step, and it becomes difficult or inefficient to filter the solid content from the contaminated coolant liquid.

Therefore, the filter paper 200 from which most of the solid content has been removed by the sludge tank unit 20 is sent to the backwash tank unit 30, which will be described later, and is subjected to a process of removing fine solid content remaining on the surface and inside of the filter paper 200. Will be done.

<Two-phase separation process>
FIG. 10 is a perspective view showing the internal structure of the two-phase separation unit 40. The coolant liquid (coolant liquid from which most of the solid content has been removed) sucked under reduced pressure by the rotating drum 11 for filtration of the filtration tank unit 10 in the above-mentioned filtration treatment step is sent to the two-phase separation unit 40 by the vacuum pump 80B. ..

The coolant liquid sent to the two-phase separation unit 40 passes through the hydrophilic oil-repellent filter 41 in the two-phase separation unit 40 to remove the impure oil component. Further, the fine residual solid content in the coolant liquid that could not be filtered out in the filtration treatment step is also filtered out by the hydrophilic oil repellent filter 41.

As shown in FIG. 10, the hydrophilic oil repellent filter 41 is housed in the two-phase separation unit 40 in a vertically standing state. As a result, the fine solids adhering to the hydrophilic oil-repellent filter 41 settle on the bottom of the two-phase separation unit 40 due to its own weight. It is possible to suppress clogging.

The two-phase separation unit 40 is equipped with liquid level detection sensors 42a and 42b that detect the liquid level in the two-phase separation unit 40 and monitor the usage limit of the hydrophilic oil-repellent filter 41. When these liquid level detection sensors 42a and 42b detect a change in the liquid level level due to clogging of the hydrophilic oil repellent filter 41, the impurity removing device 100 stops operating and prompts the replacement of the hydrophilic oil repellent filter 41.

The clear coolant regenerated through the filtration process and the two-phase separation process is sent to the machine tool connected to the impurity removing device 100 and reused, but a part of it is sent to the backwash tank unit 30 described later. Sent.

<Backwashing process>
FIG. 11 is a perspective view showing the internal structure of the backwash tank unit 30. In the backwash tank unit 30, a reverse wash rotary drum 31 having the same structure as the filtration rotary drum 11 of the filtration tank unit 10 described above, and guide rollers 36 and 37 for guiding the running of the filter paper 200 are housed. ing. The guide rollers 36 and 37 are provided with the same moisture management mechanism as the guide rollers 16 and 17 of the filtration tank unit 10 described above.

The filter paper 200 (filter paper 200 in which fine solids remain on the surface and inside) sent from the sludge tank unit 20 to the backwash tank unit 30 is fixed on the outer periphery of the backwash rotary drum 31 by the guide rollers 36 and 37. Wrapped at an angle. The backwashing rotary drum 31 is a cylindrical container in which a plurality of suction holes 35 are arranged along the outer peripheral portion, and rotates in synchronization with the running of the filter paper 200.

In the backwash tank unit 30, a clear coolant liquid from which solids and impure oils have been removed by the above-mentioned filtration treatment step and two-phase separation step is stored as backwash water for backwashing the filter paper 200. The backwash water (clear coolant liquid) is stored inside the backwash tank unit 30 through a sludge pot 32 having a conical cross section provided at the bottom of the backwash tank unit 30.

The backwash water in the backwash tank unit 30 is controlled by the liquid level detection sensors 34a and 34b so that the liquid amount is always constant, and when the liquid amount drops below the specified liquid amount due to evaporation or the like, two phases are formed. A clear coolant liquid is automatically supplied from the separation unit 40.

As shown in FIG. 12, the reverse cleaning rotary drum 31 has a built-in reverse cleaning decompression column 33 having the same function as the filtration decompression column 13 of the filtration tank unit 10 described above.

The inside of the backwashing decompression column 33 is decompressed by the vacuum pump 80B, and the vent hole 38 is provided only on the outer peripheral portion having an arc shape. Further, of the outer peripheral portion of the reverse cleaning rotary drum 31, the portion in contact with the filter paper 200 and the arc-shaped outer peripheral portion of the reverse cleaning decompression column 33 are arranged so as to overlap each other. Further, the gap between the inner peripheral surface of the backwashing rotary drum 31 and the backwashing decompression column 33 is sealed by a sealing material (not shown), and backwashing water and unnecessary air are discharged into the backwashing rotating drum 31. It has a structure that does not flow into. Therefore, as for the backwash water in the backwash tank unit 30, only the backwash water that has passed through the filter paper 200 is sucked into the backwash decompression column 33 through the ventilation holes 38.

An ejector 83 (see FIG. 4) is incorporated in the backwash water supply path. When the backwash water passes through the ejector 83, a negative pressure is generated in the ejector 83. By merging this negative pressure with the negative pressure generated by the vacuum pump 80B, it is used for vacuum filtration in the main backwashing process. The negative pressure to be applied can be increased to improve the filtration efficiency.

The filter paper 200 running along the outer peripheral portion of the reverse cleaning rotary drum 31 was backwashed by the backwash water sucked from the backwash tank unit 30 toward the backwash rotary drum 31, and remained on the surface and inside. Fine solids are removed.

On the other hand, the backwash water (backwash water containing fine solids removed from the filter paper 200) that has passed through the filter paper 200 and is sucked into the decompression column 33 for backwash is sent to the chamber unit 70 shown in FIG. It is sent and temporarily stored, and then circulated and sent into the backwash tank unit 30 through the sludge pot 32 at the bottom of the backwash tank unit 30.

As shown in FIG. 13, the chamber unit 70 is provided with a water absorption pipe 72 for sucking the backwash water into the chamber unit 70, and the backwash water in the chamber unit 70 is backwashed below the water absorption pipe 72. A drain pipe 71 for circulating water into the sludge pot 32 at the bottom of the tank unit 30 is provided.

Fine solids contained in the backwash water sent into the chamber unit 70 through the water absorption pipe 72 settle on the bottom of the chamber unit 70 while the backwash water is stored in the chamber unit 70. Therefore, the backwash water that is circulated and sent into the backwash tank unit 30 through the drain pipe 71 is a clear backwash water that does not contain solid content. The solid content settled on the bottom of the chamber unit 70 is periodically discarded.

Further, the backwash water circulated and sent from the chamber unit 70 into the backwash tank unit 30 is sent into the backwash tank unit 30 through the sludge pot 32 at the bottom of the backwash tank unit 30. Therefore, even if the backwash water circulated and sent from the chamber unit 70 to the backwash tank unit 30 contains a small amount of solids, the solids collide with the inner wall of the sludge pot 32 due to centrifugal force. Since it precipitates at the bottom of the sludge pot 32, the backwash water circulated and sent into the backwash tank unit 30 becomes clear backwash water containing no solid content.

The filter paper 200, from which the solid content and the impure oil content have been removed in this way and can be reused, is wound on the reel 61 of the filter paper winding unit 60.

A sensor (not shown) for detecting the amount of the filter paper 200 wound on the reels 51 and 61 is attached to the filter paper supply unit 50 and the filter paper winding unit 60. When the remaining amount of the filter paper 200 mounted on the reel 51 becomes small, the traveling direction of the filter paper 200 is reversed, and the recycled filter paper 200 wound on the reel 61 of the filter paper winding unit 60 travels at high speed. It is wound on a reel 51 (return trip). Further, when the remaining amount of the recycled filter paper 200 wound on the reel 61 becomes small, the return trip of the filter paper 200 is stopped. During the return trip of the filter paper 200, the filtration process in the filtration tank unit 10 and the back cleaning process in the backwash tank unit 30 are not performed.

Next, the recycled filter paper 200 is pulled out from the reel 51 of the filter paper supply unit 50 at an appropriate tension and running speed (outward running), and the above-mentioned filtration treatment step, sludge removal step, two-phase separation step and backwash step are performed. Repeated. If the filter paper 200 breaks during the outward trip or the return trip, the impurity removing device 100 stops operating and prompts the replacement of the filter paper 200.

In this way, the filter paper 200 is repeatedly used in the impurity removing device 100 until the regeneration limit is reached. Further, the contaminated coolant liquid is also repeatedly cleaned by the impurity removing device 100, returned to the machine tool, and used repeatedly.

According to the impurity removing device 100 of the present embodiment described above, the following effects can be obtained.

The filter material can be unwound from the raw fabric roll, used for filtration, and then wound up as a reusable raw fabric roll in a state where the mesh holes are cleared of clogging by backwashing under reduced pressure, and the filter material and oil-based impurities are separated. By using it in combination with a filter, solid impurities and oily impurities can be removed from the aqueous liquid.

By filtering the aqueous liquid containing solid impurities and oily impurities under reduced pressure and separating the two phases of water / oil, the contaminated aqueous liquid can be returned to a clear aqueous liquid and reused.

Since the filtration part (rotary drum 11 for filtration) of the filtration tank unit 10 and the backwash part (rotary drum 31 for backwash) of the backwash tank unit 30 have a rotary drum shape, the filter paper 200 does not stop and runs continuously. It is possible to perform the filtration treatment and the backwashing treatment in parallel, and the high-efficiency filtration treatment and the backwashing treatment can be performed.

Since the filtration part (rotary drum 11 for filtration) of the filtration tank unit 10 and the backwash part (rotary drum 31 for backwash) of the backwash tank unit 30 have a rotary drum shape, the flat type filter part and the backwash part The area can be made smaller than that of. As a result, the filtration tank unit 10 and the backwash tank unit 30 can be miniaturized, and the impurity removing device 100 can be miniaturized (space saving).

Since the filter paper 200 can be regenerated by removing the solid content adhering to the filter paper 200 in the filtration treatment step in the sludge removal treatment step and the backwashing treatment step, the filter paper 200 can be used repeatedly over a long period of time. it can.

By running the filter paper 200 at the optimum tension and speed, it is possible to prevent the occurrence of excessive tension on the filter paper 200 and enable stable running, so that the life of the filter paper 200 can be further extended.

By adopting the solid content separation method using the filter paper 200, the solid content separation efficiency is higher than that of other separation methods, and the solid content cannot be separated. Since the solid content settled in the coolant liquid storage tank can be significantly reduced, it is possible to reduce the cleaning of the impurity filtration device 100 and the machine tool, the frequency of replacing the coolant, and the frequency of stopping the device due to the replacement work. ..

(Embodiment 2)
FIG. 14 is a piping diagram showing a path of the coolant liquid in the impurity removing device 100 of the present embodiment.

The impurity removing device 100 of the present embodiment is a path for sending backwash water from the chamber unit 70 to the backwash tank unit 30 in the middle of the piping path for sending the contaminated coolant liquid from the machine tool to the filtration tank unit 10 of the impurity removing device 100. A fine bubble (micro bubble / nano bubble) generator 90 is provided in the middle of the process and in the path of sending the clear coolant liquid from the two-phase separation unit 40 to the machine tool. Since other configurations are the same as those of the impurity removing device 100 of the first embodiment described above, the description thereof will be omitted.

Here, the fine bubble is a bubble having a diameter of 100 μm or less (ISO international standard), and the micro bubble is a bubble having a diameter of 1 μm to less than 100 μm (ISO international standard). Nano bubbles are also called ultrafine bubbles, and are bubbles having a diameter of less than 1 μm (ISO international standard). Fine bubbles (microbubbles / nanobubbles) have an extremely small diameter and have a negative potential, so they have the property of adsorbing minute solids.

Therefore, when the contaminated coolant liquid passes through the sludge pot 12 of the filtration tank unit 10 by connecting the fine bubble (microbubble / nanobubble) generator 90 in the middle of the piping path for sending the contaminated coolant liquid to the filtration tank unit 10. , More minute solids in the contaminated coolant can be precipitated at the bottom of the sludge pot 12. In addition, the effect of suppressing the malodor of the contaminated coolant due to the sterilization effect can be expected.

Similarly, by connecting the fine bubble (microbubble / nanobubble) generator 90 in the middle of the path for circulating and sending the backwash water to the backwash tank unit 30, the backwash water (coolant liquid) is returned to the backwash tank unit 30. As it passes through the sludge pot 32, more minute solids in the backwash water can be precipitated at the bottom of the sludge pot 32.

As a result, the cleaning effect of the filter paper 200 is improved, so that the number of times the filter paper 200 is recycled can be increased, and the sterilizing effect of the filter paper 200 and the further cleaning effect can be expected.

Further, by connecting the fine bubble (microbubble / nanobubble) generator 90 in the middle of the path for sending the clear coolant liquid to the machine tool, various effects such as improvement of the processing efficiency and processing quality of the machine tool can be expected.

The fine bubble (micro bubble / nano bubble) generator 90 is used in the middle of the piping path for sending the contaminated coolant liquid to the filtration tank unit 10, in the middle of the path for circulating the back wash water to the back wash tank unit 30, and in the machine tool. It may be provided at only one place in the middle of the route for sending the clear coolant liquid, or at any two places.

Although the invention made by the present inventor has been specifically described above based on the embodiment, the present invention is not limited to the embodiment and can be variously modified without departing from the gist thereof. Needless to say.

In the above embodiment, the case where the present invention is applied to an apparatus for removing solid impurities and oily impurities in a coolant used in a machine tool has been described, but the impurity removing apparatus of the present invention includes industrial wastewater, domestic wastewater, and the like. It can be widely used as a device for removing solid impurities and oil-based impurities contained in various aqueous liquids. In that case, it is not necessary to replace the mechanical parts because it is only necessary to replace the filter medium according to the types of solid impurities and oil-based impurities.

10 Filtration tank unit 11 Rotating drum for filtration 12 Sludge pot 13 Decompression column 14a, 14b for filtration Liquid level detection sensor 15 Suction holes 16, 17 Guide rollers (porous material)
18 Vent hole 20 Sludge tank unit 21 Brush 22, 23 Guide roller 24 Sludge disposal tank 30 Reverse cleaning tank unit 31 Reverse cleaning rotating drum 32 Sludge pot 33 Filtration decompression column 34a, 34b Liquid level detection sensor 35 Suction holes 36, 37 Guide roller (porous material)
38 Vent hole 40 Two-phase separation unit 41 Hydrophilic oil repellent filter 42a, 42b Liquid level detection sensor 50 Filter paper supply unit (filter material traveling means)
51 Reel 60 Filter paper winding unit (filter material traveling means)
61 Reel 70 Chamber unit 71 Drain pipe 72 Water absorption pipe 80A Water supply pump 80B Vacuum pump 81 Switchboard 82 Frame 83 Ejector 90 Fine bubble generator 100 Impure removal device 200 Filter paper

Claims (12)

A filtration tank unit that removes the solid impurities from the aqueous liquid by filtering the aqueous liquid containing solid impurities and oily impurities under reduced pressure with a filter medium.
A sludge tank unit that removes the solid impurities adhering to the filter material from the filter material by the filter tank unit, and a sludge tank unit.
A two-phase separation unit that filters the aqueous liquid containing the oil-based impurities that have passed through the filter material in the filtration tank unit with a hydrophilic oil-repellent filter and removes the oil-based impurities from the aqueous liquid.
A backwash tank unit in which the filter medium from which the solid impurities have been removed by the sludge tank unit is backwashed under reduced pressure with the aqueous liquid that has passed through the hydrophilic oil repellent filter of the two-phase separation unit.
A chamber unit that circulates and sends the aqueous liquid that has passed through the filter medium in the backwash tank unit to the backwash tank unit for the decompression backwash.
It is provided with a filter material traveling means for feeding the filter material from the raw fabric roll, traveling from the filter tank unit through the sludge tank unit, running in the backwash tank unit, and winding the filter material as another reusable raw fabric roll. ,
The filtration tank unit includes a rotating drum and
The rotary drum included in the filtration tank unit has a built-in filtration decompression column, and the filtration decompression column has a substantially fan-shaped outer peripheral portion in a cross-sectional view, and is formed in an arc-shaped portion in an inner cross-sectional view of the outer peripheral portion. Is provided with a plurality of ventilation holes, and is arranged at a position where the arcuate portion in the inner cross section of the outer peripheral portion and the portion in contact with the filter material substantially overlap each other through a slight gap.
The aqueous solution is passed through the plurality of ventilation holes from the outside of the rotating drum to the inside of the filtering decompression column with respect to the filtering material continuously traveling along the outer circumference of the rotating drum. An impurity removing device characterized by removing the solid impurities from a liquid. The impurity removing device according to claim 1, wherein the aqueous liquid is an aqueous coolant liquid used in a machine tool. The aqueous liquid is sent from the machine tool to the impurity removing device, the solid impurities are removed by the filtration tank unit, the oily impurities are removed by the two-phase separation unit, and then circulating water is sent to the machine tool. 2. The impurity removing device according to claim 2. The backwash tank unit includes a rotary drum whose inside is depressurized, and applies the aqueous liquid from the outside to the inside of the rotary drum with respect to the filter medium that continuously travels along the outer periphery of the rotary drum. The impurity removing device according to any one of claims 1 to 3 , wherein the filter medium is backwashed by passing it through. The impurity removal according to any one of claims 1 to 4 , wherein the aqueous liquid is supplied into the filtration tank unit through a sludge pot having a conical cross section provided in the filtration tank unit. apparatus. Any one of claims 1 to 5 , wherein the aqueous liquid is supplied from the chamber unit into the backwash tank unit through a sludge pot having a conical cross section provided in the backwash tank unit. The impurity removing device described in the section. The impurity removing device according to any one of claims 1 to 6 , wherein the hydrophilic oil-repellent filter is housed in the two-phase separation unit in a vertically standing state. The impurity removing device according to any one of claims 1 to 7 , wherein the reserved particle size of the filter medium is 1 μm to several hundred μm. The impurity removing device according to claim 8, wherein the reserved particle size of the filter medium is 1 μm to several tens of μm. 100 μm in at least one place in the middle of the piping path for sending the aqueous liquid to the filtration tank unit, in the middle of the path for circulating the aqueous liquid to the backwash tank unit, and in the middle of the path for sending the clear coolant liquid to the machine tool. The impurity removing device according to any one of claims 1 to 9 , wherein a fine bubble generator for generating bubbles having the following diameter is provided. The rotary drum of the reverse cleaning tank unit has a built-in decompression column for reverse cleaning provided with a plurality of vents on the outer peripheral portion having an arc shape. The impurity removing device according to claim 1, wherein the contact portion and the arc-shaped outer peripheral portion of the backwashing pressure reducing column are arranged so as to overlap each other. A guide roller for guiding the running of the filter medium is housed inside the filter tank unit and inside the backwash tank unit.
The impurity removing device according to any one of claims 1 to 11 , wherein the surface of the guide roller is made of a porous body that absorbs water.

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