JP6635453B1 - Sludge removal device - Google Patents

Abstract

A filter paper used for efficiently removing solids such as sludge and oil such as impure oil contained in a coolant after use in a machine tool to regenerate a clear coolant and to remove solids. To provide a sludge removing device that can be used a plurality of times by regenerating the sludge. A sludge removing device (100) removes a solid content such as sludge contained in a coolant liquid after being used in a grinding machine tool by a reduced pressure filtration unit (10) and a two-phase separation unit (20), and includes the solid content in the coolant liquid. The contaminated coolant liquid is regenerated into a clear coolant liquid by removing the impure oil to be removed by the two-phase separation unit 20. In addition, solids such as sludge adhering to the filter paper 41 used in the vacuum filtration of the coolant liquid in the vacuum filtration unit 10 are removed by the sludge disposal unit 30 (30R, 30L) and the back washing unit 50 (50R, 50L) for cleaning. Since the filter paper 41 is regenerated into a filter paper 41, the filter paper 41 can be used repeatedly without being discarded in one use. [Selection diagram] FIG.

Description

  The present invention relates to a sludge removal device for removing impurities in an aqueous solution, for example, a sludge for regenerating a clear coolant solution by removing solids such as sludge and oil such as impure oil contained in a coolant solution used in a machine tool. It relates to a removing device.

  2. Description of the Related Art A grinding machine tool such as a grinding machine that uses a grindstone to grind a steel material requires a coolant liquid to be supplied because the temperature of the contact point between the grindstone and the workpiece becomes extremely high during grinding. The coolant has the effect of cooling the workpiece and keeping the sharpness of the grindstone good and maintaining high grinding accuracy.

  However, the coolant liquid after being used in the grinding machine tool contains solids such as cutting chips as grinding dust and abrasive grains peeled off from the grindstone (hereinafter, these are collectively referred to as sludge), lubricating oil, and oil. Since impure oil such as rust oil is mixed, if such a dirty coolant liquid is continuously used, the grinding accuracy is reduced, and the processing quality of the workpiece is reduced.

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

  For example, Patent Literature 1 discloses a sludge separation apparatus that employs a method in which sludge mixed in a grinding liquid such as a coolant liquid or a grinding oil is settled by magnetic attraction and its own weight.

Japanese Patent No. 5477946

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

  However, sludge having a fine particle diameter of about 1 μm to several μm is difficult to remove by the conventional method of sedimentation by magnetic attraction or own weight. The method of filtering the coolant using a filter paper of about μm was studied.

  However, when trying to filter sludge in the coolant liquid using a filter paper having a retained particle diameter of about 1 μm to several μm, a long time is required for the filtration, and there is a problem that the workability of sludge removal is reduced.

  In general, in a sludge removal method using filter paper as a filter material, the filter paper must be discarded only once after use due to clogging of the filter paper. There is also a problem that the increase and the environmental load are caused.

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

  Furthermore, the separation method (centrifugation, liquid cyclone, magnet separation, etc.) employed by conventional filtration devices makes it difficult to efficiently separate fine sludge of about 1 to several μm, and sludge that could not be collected is There is also a problem that frequent tank cleaning work, coolant exchange frequency and machine stoppage due to the exchange work are required because the sediment gradually accumulates at the bottom of the tank.

  The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a sludge removing apparatus capable of efficiently removing impurities (solids such as sludge and oil) contained in an aqueous solution. Is to provide.

  Another object of the present invention is to provide a sludge removing apparatus capable of removing impurities (solid content such as sludge and oil) contained in an aqueous solution to regenerate a clear aqueous solution.

  It is still another object of the present invention to provide a sludge removing apparatus which regenerates a filter medium used for removing impurities and which can be used plural times.

  Still another object of the present invention is to provide a sludge removing apparatus capable of saving space in equipment for removing impurities contained in an aqueous solution.

  The sludge removal device according to the first aspect of the present invention is a vacuum filtration unit that removes the impurities from the aqueous solution by filtering the aqueous solution containing impurities using a filter medium under reduced pressure, and the filter that has passed through the filter medium. A two-phase separation unit that removes oil from the aqueous solution by filtering the aqueous solution using a hydrophilic oil-repellent filter, and a first sludge disposal unit that removes solids attached to the surface of the filter medium with the reduced-pressure filtration unit A second sludge disposal unit that removes the solids attached to the surface of the filter medium by the reduced pressure filtration unit, and a second step that backwashes the filter medium from which the solids have been removed by the first sludge disposal unit. (1) a backwashing unit, a second backwashing unit for backwashing the filter medium from which the solids have been removed by the second sludge disposal unit, and a first rewashing unit. The filter material wound around the filter is passed through the first back washing unit, the first sludge discarding unit, the reduced pressure filtration unit, the second sludge discarding unit, and the second filter washing unit via the second back washing unit. A first filter medium supply unit for supplying a supply medium to the supply unit, and a second backwashing unit, a second sludge disposal unit, a reduced pressure filtration unit, and a first sludge disposal unit for removing the filter medium wound on a second reel. A second filter medium supply unit that supplies the first filter medium supply unit to the first filter medium supply unit via the first backwash unit; and the first filter paper supply unit, the first backwash unit, and the second filter medium supply unit. 1 sludge disposal unit, the reduced-pressure filtration unit, the second sludge disposal unit, the second backwashing unit and the second filter paper supply unit. Provided in an automatic rotary feed mechanism for reciprocating travel, the

  In the sludge removing device according to a second aspect of the present invention, in the first aspect, the aqueous solution may be an aqueous coolant liquid.

  In the sludge removing device according to a third aspect of the present invention, in the second aspect, the aqueous coolant liquid is supplied from a machine tool, passes through the reduced-pressure filtration unit and the two-phase separation unit, and the solid content and The aqueous coolant from which the oil has been removed may be returned to the machine tool.

  The sludge removing device according to a fourth aspect of the present invention, in the first aspect, wherein the reduced-pressure filtration unit and the reduced-pressure filtration unit are used as a washing liquid for back-washing the filter medium in the first back washing unit and the second back washing unit. The aqueous solution from which the solid content and the oil content have been removed through the two-phase separation unit may be used.

  In the sludge removing apparatus according to a fifth aspect of the present invention, in the first aspect, the filter medium may be filter paper or filter cloth having a retained particle diameter of 1 μm to several tens μm.

  In the sludge removing apparatus according to a sixth aspect of the present invention, in the fifth aspect, the filter medium may be filter paper or filter cloth having a retained particle diameter of 1 μm to several μm.

  In the sludge removing apparatus according to a seventh aspect of the present invention, in the first aspect, the reduced-pressure filtration unit may include a drying unit that removes moisture contained in the filter medium after the reduced-pressure filtration.

  In the sludge removing device according to an eighth aspect of the present invention, in the first aspect, the first backwashing unit and the second backwashing unit remove moisture contained in the filter medium after the backwashing. A drying unit may be provided.

  In the sludge removing apparatus according to a ninth aspect of the present invention, in the first aspect, the backwashing in the first backwashing unit and the second backwashing unit may be performed under reduced pressure.

  The sludge removing apparatus according to a tenth aspect of the present invention, in the first aspect, performs the filtration in the two-phase separation unit under a reduced pressure of 0 to -100 kPa, preferably -1 kPa to -50 kPa. May be performed.

  The sludge removing device according to an eleventh aspect of the present invention is the sludge removing device according to the first aspect, wherein the solid content removal in the first sludge disposal unit and the second sludge disposal unit is performed by rotating a rotating brush with the filter material. May be performed by contacting the surface.

  The sludge removing apparatus according to a twelfth aspect of the present invention is the sludge removing apparatus according to the first aspect, wherein the filtering material is supplied to the first filter paper supply unit, the first back washing unit, the first sludge disposal unit, and the reduced pressure filtration unit. The reciprocating operation may be performed a plurality of times between the second sludge disposal unit, the second backwash unit, and the second filter paper supply unit.

The sludge removing device according to a thirteenth aspect of the present invention, in the first aspect, is supplied from the first filter paper supply unit, the first backwash unit, the first sludge disposal unit, the reduced pressure filtration unit, The filter medium traveling toward the second filter paper supply unit via the second sludge disposal unit and the second backwash unit is provided with moisture in the first backwash unit, and the second filter paper is provided with water. It is supplied from a supply unit, and is directed to the first filter paper supply unit via the second backwash unit, the second sludge disposal unit, the reduced pressure filtration unit, the first sludge disposal unit, and the first backwash unit. Water may be applied to the filter medium that travels by the second back washing unit.
In the sludge removing apparatus according to a fourteenth aspect of the present invention, in the first aspect, the filtration in the reduced-pressure filtration unit and the first and second backwashing units may be performed at a reduced pressure of 0 to -100 kPa, preferably It may be performed under a reduced pressure of -1 kPa to -50 kPa.

  ADVANTAGE OF THE INVENTION According to the sludge removal apparatus of this invention, solid content and oil content of sludge etc. contained in aqueous solution can be efficiently removed by filtering aqueous solution under reduced pressure.

  ADVANTAGE OF THE INVENTION According to the sludge removal apparatus of this invention, while filtering an aqueous solution under reduced pressure and separating a two-phase of water / oil, a dirty aqueous solution can be regenerated into a clear aqueous solution.

  According to the sludge removal apparatus of the present invention, after removing solids such as sludge attached to the surface of the filter medium in the sludge disposal unit, the filter medium is back-washed in the backwash unit to regenerate the filter medium. Therefore, the filtering material can be used a plurality of times.

  According to the sludge removing device of the present invention, since the removal of the solid content and the removal of the oil content contained in the aqueous solution are performed by one device, the space for the equipment for removing impurities can be saved.

  According to the sludge removing apparatus of the present invention, since solid components having a fine particle diameter can be almost collected and removed, when the aqueous solution is a coolant for a machine tool, a metal which requires high precision processing is required. It is possible to maintain the quality of the product, extend the life of the coolant, and use the filter medium for a long time.

  According to the sludge removal device of the present invention, the separation efficiency of impurities is higher than other separation methods, and solid content such as sludge that cannot be separated and settles at the bottom of the tank can be significantly reduced. In this case, the frequency of cleaning the sludge sedimentation tank, replacing the coolant, and stopping the machine due to the replacement work are reduced.

It is a front view showing the whole sludge removal mounting device composition concerning an embodiment of the invention. FIG. 2 is a perspective view showing a state in which a part of the sludge removing device shown in FIG. 1 is removed. FIG. 2 is a schematic diagram illustrating a traveling path of a filter paper mounted on a filter paper supply unit of the sludge removing device illustrated in FIG. 1. FIG. 2 is an enlarged perspective view showing a reduced pressure filtration unit of the sludge removing device shown in FIG. 1. FIG. 2 is an enlarged perspective view showing a two-phase separation unit of the sludge removing device shown in FIG. 1. FIG. 6 is an exploded perspective view showing an oil-water separation unit of the two-phase separation unit shown in FIG. FIG. 2 is an enlarged perspective view showing a state in which a part of a sludge disposal unit of the sludge removing device shown in FIG. 1 is removed. FIG. 2 is a perspective view showing a state in which a sludge disposal tank of a sludge disposal unit of the sludge removal device shown in FIG. 1 is pulled out. FIG. 2 is an enlarged perspective view showing a reverse cleaning unit of the sludge removing device shown in FIG. 1. FIG. 2 is an enlarged front view showing a filter paper supply unit of the sludge removing device shown in FIG. 1.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view showing an entire configuration of a sludge removing device according to an embodiment of the present invention, and FIG. 2 is a diagram illustrating a part of the sludge removing device shown in FIG. 1 (a part of a frame, an operation panel, etc.) is removed. FIG. 3 is a schematic view showing a traveling path of the filter paper attached to the filter paper supply unit of the sludge removing device shown in FIG.

  The sludge removal device of the present embodiment is connected to a grinding machine tool such as a surface grinder via a connection hose, and removes sludge and impurity oil mixed in a coolant used in the grinding machine tool. This is a device that regenerates a clarified coolant and returns the clarified coolant to a grinding machine tool. The coolant is assumed to be an aqueous coolant generally used in the field of grinding machine tools (a coolant used by diluting a stock solution with water).

  As shown in FIGS. 1 and 2, the sludge removing device 100 includes a reduced-pressure filtration unit 10 disposed at the top of the device, a two-phase separation unit 20 disposed below the reduced-pressure filtration unit 10, and a two-phase separation unit. A pair of sludge disposal units 30 (30R, 30L) disposed on both left and right sides of the unit 20, a pair of left and right filter paper supply units 40 (40R, 40L) disposed below the sludge disposal unit 30, and a filter paper supply unit 40 ( 40R, 40L), the backwashing unit 50 (50R, 50L) disposed near the apparatus, the pumps (water supply pumps 60a, 60b, 60c, vacuum pump 61) disposed at the bottom of the apparatus, and the running of each unit and filter paper And a frame 71 (FIG. 1) that supports the above-described units, pumps, and the like.

  The filter paper supply unit 40 (40R, 40L) is provided with a filter paper 41 wound in a roll shape. Since the particle diameter of the sludge contained in the coolant used in the grinding machine tool is generally 1 μm to several tens of μm, the retained particle diameter of the filter paper 41 used in the sludge removing device 100 of the present embodiment is 1 μm to several μm. It is 10 μm, preferably 1 μm to several μm, more preferably 1 μm. Further, instead of the filter paper 41, a filter cloth (including a bag-like one) having the same retained particle diameter as described above, a filter material made of a plurality of filter papers or a mixed material obtained by laminating the filter paper and the filter cloth is used. You can also.

  The roll-shaped filter paper 41 attached to the filter paper supply unit 40 (40R, 40L) is connected to an automatic rotary feed mechanism such as a speed control motor provided in each of the filter paper supply units 40 (40R, 40L) (FIGS. 1 and 2). (Not shown) from one of the filter paper supply units 40 (40R, 40L).

  As shown in FIG. 3, of the pair of filter paper supply units 40 (40R, 40L), the filter paper 41 pulled out from the reel 42 of the filter paper supply unit 40R is provided with guide rollers 80R, 81R, 82R, 83R for filter paper feed. While being guided by 84R, 85R, 86R, 87R, it is sent to the vacuum filtration unit 10 at the top of the device via the backwash unit 50R and the sludge disposal unit 30R. Thereafter, the filter paper 41 is guided by the guide rollers 87L, 86L, 85L, 84L, 83L, 82L, 81L, and 80L for feeding the filter paper while passing through the sludge disposal unit 30L and the backwashing unit 50L. It is wound on a reel 42.

  In this way, when most of the filter paper 41 wound around the reel 42 of the filter paper supply unit 40R is pulled out and the remaining amount decreases, the feeding direction of the filter paper 41 is reversed. That is, the filter paper 41 wound around the reel 42 of the filter paper supply unit 40L is pulled out and sent to the reduced-pressure filtration unit 10 via the backwashing unit 50L and the sludge disposal unit 30L, and then the sludge disposal unit 30R and the reverse. It is wound on the reel 42 of the filter paper supply unit 40R via the cleaning unit 50R.

  Next, a sludge removing step using the sludge removing apparatus 100 of the present embodiment will be described in detail.

  Hereinafter, a case where the filter paper 41 extracted from the filter paper supply unit 40R is sent to the filter paper supply unit 40L via the path shown in FIG. 3 will be described. Also, the description will be made on the assumption that the filter paper 41 drawn out from the filter paper supply unit 40R is a new (unused) filter paper 41.

  The operator who operates and manages the sludge removing apparatus 100 first mounts the filter paper 41 on the reel 42 of the filter paper supply unit 40R, then pulls out the filter paper 41 manually from the reel 42, and puts one end of the pulled out filter paper 41 in FIG. Each of the illustrated units (excluding the two-phase separation unit 20) is passed through and wound around the reel 42 of the filter paper supply unit 40L.

  In addition, the operator must take into account the degree of contamination of the coolant, the type of impurities, etc., and operate the optimum values such as filter paper travel distance, filtration capacity, reduced pressure filtration time, reduced pressure / backwash time, and backwash capacity in advance. The input is made on the panel 70 (FIG. 1).

  FIG. 4 is an enlarged perspective view of the reduced-pressure filtration unit 10 arranged at the uppermost part of the sludge removing device 100.

  The reduced pressure filtration unit 10 includes a filtration chamber section 11 and a pair of drying sections 12R and 12L arranged on both left and right sides of the filtration chamber section 11. The filtration chamber section 11 and the drying sections 12R and 12L are connected to a vacuum pump 61 (FIGS. 1 and 2), and are configured so that the inside is depressurized.

  The used coolant supplied from the grinding machine tool to the sludge removing apparatus 100 is sent to the vacuum filtration unit 10 through the pipe 13 by the coolant circulation pump 60a (FIGS. 1 and 2) at the bottom of the apparatus, and the vacuum pump 61 The filter paper 41 is subjected to a reduced pressure filtration process (solid-liquid separation process) in the filtration chamber section 11 that has been decompressed by (FIGS. 1 and 2). The reduced pressure filtration process in the filtration chamber section 11 is performed for a predetermined time (time previously input to the operation panel 70) while the traveling of the filter paper 41 is stopped. The reduced pressure filtration in the reduced pressure filtration unit 10 is performed, for example, under reduced pressure of a reduced pressure value of 0 to -100 kPa, preferably -1 kPa to -50 kPa.

  By this vacuum filtration, most of the sludge in the coolant is collected by the filter paper 41 in the filtration chamber 11 and adheres to the surface of the filter paper 41. On the other hand, the coolant liquid from which most of the sludge has been removed through the filter paper 41 is sent to the two-phase separation unit 20 (FIGS. 1 and 2) below the reduced-pressure filtration unit 10.

  As described above, by filtering the coolant liquid under reduced pressure using the filter paper 41 having a small retained particle diameter, efficient filtration that was difficult with the natural filtration method under the atmospheric pressure can be performed, and sludge in the coolant liquid can be reduced. It can be removed in a short time.

  Bacteria that cause unpleasant odors are mixed in the used coolant sent from the grinding machine tool. However, the bacteria in the coolant are not filtered because the bacteria are approximately 1 μm in size. Collected by 41.

  When the vacuum filtration for a predetermined time is completed in the filtration chamber section 11, the traveling of the filter paper 41 is automatically started, the filter paper 41 in the filtration chamber section 11 is sent to the drying section 12L, and a clean portion of the filter paper 41 is removed from the filtration chamber. It is sent to the unit 11. Then, after the traveling of the filter paper 41 is stopped, a vacuum filtration process of the coolant liquid by the clean filter paper 41 is performed in the filtration chamber section 11. In this manner, the filtration of the coolant liquid under reduced pressure is continued while the movement of the filter paper 41 having the sludge adhered to the surface to the drying section 12L and the movement of the clean filter paper 41 to the filtration chamber section 11 are repeated.

  The filter paper 41 sent from the filtration chamber section 11 to the drying section 12L is subjected to dehydration and drying processing in the drying section 12L, which is depressurized by an ejector (not shown).

  The filter paper 41 that has come into contact with the coolant liquid in the filtration chamber section 11 contains a large amount of water (coolant liquid). . If wrinkles are generated on the filter paper 41 during traveling, unevenness of expansion / contraction of the filter paper 41 occurs, and traveling becomes unstable. Therefore, by removing the water contained in the filter paper 41 to some extent in the drying section 12L adjacent to the filtration chamber section 11, it is possible to prevent wrinkles from occurring during traveling.

  Thereby, unstable running due to excessive moisture of the filter paper 41 sent downstream of the reduced pressure filtration unit 10 (the sludge disposal unit 30L and the backwash unit 50L) can be prevented. Further, sludge removal on the surface of the filter paper 41 by the rotating brush in the sludge disposal unit 30L described later can be stably performed. At this time, the drying process of the filter paper 41 under reduced pressure is also performed in the other drying unit 12R adjacent to the filtration chamber unit 11.

  When performing the drying under reduced pressure of the filter paper 41 in the drying unit 12L (and the drying unit 12R), it is preferable that the filter paper 41 is not completely dried but a certain amount of water is left in the filter paper 41. If the filter paper 41 is excessively dried, wrinkles are generated during traveling, and uneven elongation / contraction occurs, and traveling becomes unstable, as in the case where a large amount of water is contained in the filter paper 41.

  In addition, when the coolant is subjected to reduced pressure filtration in the filtration chamber 11 using the wrinkled filter paper 41, the amount of air leakage in the filtration chamber 11 increases, the degree of vacuum decreases, and the sludge filtration efficiency increases. May decrease.

  The sludge removing apparatus 100 of the present embodiment uses a single vacuum pump 61 (FIGS. 1 and 2), a reduced-pressure filtration unit 10, a two-phase separation unit 20, and a back washing unit 50 (50R, 50L) described later. ) To perform a decompression treatment. Therefore, when the degree of vacuum in the filtration chamber section 11 is reduced due to the wrinkles of the filter paper 41, the degree of vacuum is also reduced in the two-phase separation unit 20 and the backwashing unit 50, and the oil-water separation efficiency of the coolant and the filter paper 41 are reduced. Cleaning efficiency may be reduced.

  FIG. 5 is an enlarged perspective view of the two-phase separation unit 20 arranged below the vacuum filtration unit 10.

  The two-phase separation unit 20 includes an oil-water separation unit 21 and a coolant storage tank 22 disposed below the oil-water separation unit 21.

As shown in FIG. 6, the decompressed oil / water separator 21 has a built-in hydrophilic oil-repellent filter 25 cut into a predetermined size as a filtering material. The retention particle size of the hydrophilic oil-repellent filter 25 is, for example, about 1 μm to 50 μm, but is not limited thereto, and the optimal retention particle diameter is determined in accordance with the properties of various oils contained in the coolant liquid. Can be selected.
The oil-water separation unit 21 is connected to a vacuum pump 61 (FIGS. 1 and 2) to increase the filtration efficiency, and is configured so that the inside is depressurized. The filtration in the oil-water separation unit 21 is performed, for example, under a reduced pressure of 0 to -100 kPa, preferably -1 kPa to -50 kPa.

  The coolant liquid supplied from the filtration chamber section 11 of the reduced-pressure filtration unit 10 to the oil-water separation section 21 through the pipe 23 is subjected to a reduced-pressure filtration process in the oil-water separation section 21, and the impure oil in the coolant liquid is removed by the hydrophilic oil-repellent filter 25. Is adsorbed. On the other hand, the coolant liquid that has passed through the hydrophilic oil-repellent filter 25 is sent to a coolant liquid storage tank 22 below the oil / water separation unit 21.

  In the coolant liquid sent from the vacuum filtration unit 10 to the two-phase separation unit 20, not only the impure oil but also sludge that could not be completely removed by the vacuum filtration unit 10 remains. The filter material (hydrophilic oil-repellent filter 25) in the section 21 separates and removes the coolant from the coolant.

  As described above, the sludge removing apparatus 100 according to the present embodiment includes two types of filter media (the filter paper 41 and the hydrophilic repellent material) in two places: the filtration chamber section 11 of the reduced pressure filtration unit 10 and the oil / water separation section 21 of the two-phase separation unit 20. The coolant liquid is subjected to reduced pressure filtration using an oil filter 25). This makes it possible to efficiently remove solids (sludge, bacteria) and oil (impure oil) mixed in the coolant used in the grinding machine tool and regenerate the coolant into a clear coolant.

  The clear coolant that has been sent to the coolant storage tank 22 through the hydrophilic oil-repellent filter 25 in the oil / water separation unit 21 is temporarily stored in the coolant storage tank 22, and then the coolant circulation pump 60 (FIG. 1). 2), it is returned to the grinding machine tool through the pipe 24 and reused. Then, the coolant liquid reused in the grinding machine tool is sent to the sludge removing device 100 again to be clarified, and then returned to the grinding machine tool.

  In this way, by continuously circulating the coolant between the grinding machine tool and the sludge removing device 100, the coolant used in the grinding machine tool is kept in a clear state for a long period of time. Can be.

  Accordingly, a decrease in grinding accuracy of a workpiece to be processed by the grinding machine tool can be suppressed, so that the processing quality of the workpiece can be improved.

  Note that, as described later, a part of the clear coolant sent to the coolant storage tank 22 of the two-phase separation unit 20 is sent to the backwashing unit 50L (and the backwashing unit 50R) for backwashing. Used as a cleaning solution for

  On the other hand, the filter paper 41 having sludge adhered to the surface thereof in the filtration chamber section 11 of the reduced-pressure filtration unit 10 is sent to the sludge disposal unit 30L after the moisture is appropriately removed in the drying section 12L.

  FIG. 7 is an enlarged perspective view showing a state in which a part (a part of a cover and the like) of the sludge disposal unit 30L disposed downstream of the reduced pressure filtration unit 10 is removed.

  The sludge disposal unit 30L includes a box-shaped cover 31. Inside the cover 31, a roll-shaped brush 32 rotating via gears 37, 37b, 37c and a belt 38, and a guide for guiding a filter paper 41 are provided. The rollers 33, 34, and 35, the sludge waste tank 36 disposed below the brush 32, and the like are accommodated. Although not shown, the other sludge disposal unit 30R (FIGS. 1 and 2) has the same configuration as the sludge disposal unit 30L.

  As shown in FIG. 7, the running filter paper 41 is pressed against the surface of the brush 32 by a guide roller 34 disposed near the brush 32, whereby solids such as sludge adhered to the surface of the filter paper 41 are removed. It is scraped off by the rotating brush 32.

  The rotation speed and the rotation direction of the brush 32 are configured to be changeable according to the sludge removal status. Thereby, the sludge on the surface of the filter paper 41 can be efficiently removed regardless of the size and content of the sludge in the coolant liquid.

  At this time, the surface of the filter paper 41 sent to the other sludge disposal unit 30R is clean (no sludge is attached to the surface), but in the sludge disposal unit 30R, the brush 32 and the filter paper 41 are in contact with each other. (The state shown in FIG. 7) is maintained.

  The sludge separated from the surface of the filter paper 41 by contact with the brush 32 installed in the cover 31 of the sludge disposal unit 30L falls into the sludge disposal tank 36 at the bottom of the cover 31. Therefore, as shown in FIG. 8, the sludge disposal tank 36 at the bottom of the cover 31 is manually pulled out, and the sludge accumulated therein is transported to a predetermined disposal place.

  As described above, solids such as sludge adhered to the surface of the filter paper 41 in the filtration chamber section 11 of the reduced pressure filtration unit 10 are separated from the surface of the filter paper 41 in the cover 31 of the sludge disposal unit 30L. However, since fine sludge and the like still remain inside the filter paper 41 (inner layer), when the filter paper 41 is reused in the sludge removing device 100, the filter paper 41 becomes an It causes clogging and makes it difficult or inefficient to remove sludge from the coolant liquid.

  Therefore, the filter paper 41 from which sludge on the surface has been removed by the sludge disposal unit 30L is sent to the downstream backwashing unit 50L to remove fine sludge remaining inside the filter paper 41.

  FIG. 9 is an enlarged perspective view of the backwashing unit 50L disposed downstream of the sludge disposal unit 30L.

  The reverse cleaning unit 50L disposed near the filter paper supply unit 40L (FIGS. 1 and 2) includes a reverse cleaning chamber unit 51 and a drying unit 52 disposed adjacent to the reverse cleaning chamber unit 51. . The drying unit 52 is disposed between the reverse cleaning chamber unit 51 and the filter paper supply unit 40L.

  Although not shown, the other reverse cleaning unit 50R (FIGS. 1 and 2) disposed near the filter paper supply unit 40R (FIGS. 1 and 2) also includes the reverse cleaning chamber unit 51 and the reverse cleaning chamber unit 51. And a drying unit 52 disposed adjacent to the filter unit. The drying unit 52 is disposed between the reverse cleaning chamber unit 51 and the filter paper supply unit 40R.

  The reverse cleaning chamber section 51 and the drying section 52 of the reverse cleaning unit 50L (and the reverse cleaning unit 50R) are connected to a vacuum pump 61 (FIGS. 1 and 2), and are configured to reduce the pressure inside. The filtration in the backwashing unit 50L (and the backwashing unit 50R) is performed, for example, under a reduced pressure of 0 to -100 kPa, preferably -1 kPa to -50 kPa.

  A cleaning liquid storage tank 53 that supplies a cleaning liquid to the reverse cleaning chamber 51 is connected to the reverse cleaning unit 50L (and the reverse cleaning unit 50R). The sludge removing apparatus 100 according to the present embodiment uses a clear coolant liquid separated from oil and water by the two-phase separation unit 20 as a cleaning liquid to be supplied to the reverse cleaning chamber unit 51. That is, the cleaning liquid storage tank 53 is connected to the coolant storage tank 22 of the two-phase separation unit 20, and a part of the clear coolant stored in the coolant storage tank 22 is supplied to the cleaning liquid storage tank 53, Further, the cleaning liquid is supplied from the cleaning liquid storage tank 53 to the reverse cleaning chamber section 51.

  Inside the cleaning liquid storage tank 53, a liquid level sensor (not shown) for monitoring the amount of the cleaning liquid is provided, and the reduced amount of the cleaning liquid due to spontaneous evaporation or the like is used as the coolant storage tank 22 of the two-phase separation unit 20. , The cleaning liquid in the cleaning liquid storage tank 53 is automatically controlled to a constant amount.

  The filter paper 41 sent from the sludge disposal unit 30L to the backwashing unit 50L is subjected to a backwashing process in the backwashing chamber 51 where the pressure is reduced. That is, the cleaning liquid is supplied from the back surface side of the filter paper 41 sent to the reverse cleaning chamber unit 51 to the front surface (the surface to which the sludge is adhered in the filtration chamber unit 11 of the reduced pressure filtration unit 10). Solid matter such as remaining fine sludge is removed.

  The filter paper 41 that has been backwashed is sent from the backwash chamber 51 to the drying unit 52 in order to prevent unstable running due to excessive moisture, and subjected to dehydration and drying processing in the depressurized drying unit 52. Thereafter, the paper is sent to the filter paper supply unit 40L while maintaining an appropriate water content.

  As described above, according to the sludge removing apparatus 100 of the present embodiment, the solid matter such as the sludge adhered to the surface of the filter paper 41 in the reduced pressure filtration step of the reduced pressure filtration unit 10 is removed by the brush 32 of the sludge disposal unit 30L (see FIG. Since fine sludge and the like remaining in the filter paper 41 after the removal in FIG. 7) are removed in the backwashing step of the backwashing unit 50L, it is possible to regenerate the filter paper 41 having a very small content of solids such as sludge. Can be.

  FIG. 10 is an enlarged front view of the filter paper supply units 40R and 40L.

  The recycled filter paper 41 sent from the backwashing unit 50L to the filter paper supply unit 40L is wound on a reel 42. The filter paper supply unit 40L (and the filter paper supply unit 40R) is provided with a laser sensor 43 for detecting the end point of the filter paper 41, and the thickness of the filter paper 41 wound on the reel 42 during the operation of the sludge removing device 100. (Roll outer diameter) is constantly measured by the laser sensor 43.

  When the thickness of the filter paper 41 measured by the laser sensor 43 of the filter paper supply unit 40R is reduced to a preset value, the remaining amount of the filter paper 41 wound on the reel 42 of the filter paper supply unit 40R becomes small. The judgment is made, and the feed direction of the filter paper 41 is reversed by the automatic rotary feed mechanism 44 installed in the filter paper supply unit 40L and the filter paper supply unit 40R.

  That is, the recycled filter paper 41 is pulled out from the reel 42 of the filter paper supply unit 40L. Then, the extracted filter paper 41 is sent to the reduced-pressure filtration unit 10 via the back-washing unit 50L and the sludge disposal unit 30L, where it is used for reduced-pressure filtration of the coolant, and then sent to the sludge disposal unit 30R. Then, the solid content on the surface is removed, and further sent to the backwashing unit 50R to be subjected to the backwashing process, and then wound around the reel 42 of the filter paper supply unit 40R.

  In addition, even when the recycled filter paper 41 pulled out from the reel 42 of the filter paper supply unit 40L passes through the reverse cleaning unit 50L, the reverse cleaning process is performed, so that a small amount of solids contained in the recycled filter paper 41 is removed. Is further reduced. Further, after the backwashing process is performed in the backwashing chamber unit 51 of the backwashing unit 50L, a certain amount of water is removed by vacuum drying, so that the vacuum washing unit is removed from the backwashing unit 50L via the sludge disposal unit 30L. The generation of wrinkles during traveling of the filter paper 41 sent to the paper 10 can be prevented.

  As described above, according to the sludge removing apparatus 100 of the present embodiment, the solid content such as the sludge adhered to the filter paper 41 used for the vacuum filtration of the coolant in the vacuum filtration unit 10 is removed by the sludge disposal unit 30 (30R, 30L). ) And the backwashing unit 50 (50R, 50L) removes the filter paper 41 used for removal of solids such as sludge. Can be used.

  This eliminates the need to discard the filter paper 41 each time it is used, thereby avoiding an increase in processing time due to the frequent replacement of the filter paper, an increase in filter paper cost, an increase in environmental load, and the like.

  Further, according to the sludge removing apparatus 100 of the present embodiment, the solid content such as sludge and the impure oil contained in the used coolant can be removed by a single apparatus. The space of the equipment can be reduced as compared with the case where the equipment for removing the water is used.

  Next, a test performed to verify the effect of the sludge removing device 100 according to the present embodiment and results thereof will be described.

<Test-1>
(Purpose)
The efficiency of the reduced-pressure filtration method is verified by comparing the reduced-pressure filtration method with the reduced-pressure filtration unit 10 of the sludge removing device 100 with the natural filtration method.
(Facilities and materials used)
Filter material: fixed filter paper with retained particle diameter of 1 μm Reagent: water-soluble coolant (2% dilution)
(Experimental conditions)
Decompression power: -8.8Kpa
Reagents: (a) Clarified (unused) coolant, (b) Dirt (used) coolant Amount of water supply: 500 cc

(Experimental result)
(A) As a result of comparing the filtration time of the clarified (unused) coolant liquid, the filtration time was 684 sec for the natural filtration method, 18.7 sec for the reduced pressure filtration method, and the filtration efficiency of the reduced pressure filtration method when the natural filtration method was 100%. Was 3703%.
(B) As a result of comparing the filtration time of the contaminated (used) coolant liquid, the filtration time was 1253 sec for the natural filtration method and 24 sec for the reduced pressure filtration method. When the natural filtration method was 100%, the filtration efficiency of the reduced pressure filtration method was 5263. %Met.

(Discussion)
When two kinds of coolant liquids are filtered under reduced pressure using the reduced pressure filtration unit 10 of the sludge removing device 100, in comparison with the natural filtration method, either a clear (unused) coolant liquid or a dirty (used) coolant liquid is used. However, the vacuum filtration method proved to have high filtration efficiency.
Further, it was found that the dirt (used) coolant liquid had higher filtration efficiency than the clarified (unused) coolant liquid, and the vacuum filtration method was suitable for filtering the coolant liquid.

<Test-2>
(Purpose)
The target of sludge removal achieved by the backwashing unit 50 of the sludge removal device 100 will be verified.
(Experiment contents)
A certain amount of dirt (used) coolant is supplied to the filtration chamber unit 11 of the filtration and drying unit 10 in which the filter paper is disposed, and the amount of sludge deposited on the surface of the filter paper is determined.
(A) After the filtration under reduced pressure, the backwashing is not performed in the backwashing chamber 51 of the backwashing unit 50.
(B) After the filtration under reduced pressure, the backwashing is performed in the backwashing chamber 51 of the backwashing unit 50.
The number of times of filtration under reduced pressure / backwashing under the condition of (1): A sample is collected every 1 to 5 times, and the following items are compared.
(1) Transition of discoloration on the filter paper surface (2) Difference in mass per unit area of filter paper (3) Transition of filtration time per unit volume of coolant liquid (Facilities and materials used)
Precision balance: tuning fork vibratory balance Filter material: fixed filter paper with retained particle diameter of 1 μm Reagent: water-soluble coolant (2% dilution)
(Experimental conditions)
Reduced pressure (filtration chamber): -8.8 kpa
Reagent for filtration: dirt (used) coolant liquid Water supply amount: 500cc (each time))
Reduced pressure (backwashing chamber): -8.8 kpa
Backwashing reagent solution: Clear (unused) coolant solution Water supply amount: 500cc (each time)

(Experimental results and discussion)
(A) Change in discoloration due to filter paper surface contamination [Without backwashing]
As compared with the surface of the filter paper after zero filtration, the color of the surface of the filter paper gradually becomes darker due to sludge deposited on the surface of the filter paper as the number of times of filtration increases.
[With backwashing]
Compared with the filter paper without filtration / backwashing 0 times, the surface of the filter paper subjected to backwashing is closer to the color of the filter paper surface without filtration / backwashing 0 times and less discolored than the surface of the filter paper without backwashing. I understand.
(B) Changes in mass per unit area of filter paper Comparing the mass of filter paper that has been subjected to the same number of times of filtration, the mass of filter paper that has been subjected to backwashing is smaller than the mass of filter paper that has not been subjected to backwashing, It can be seen that the filtration performance is maintained by removing the sludge on the surface of the filter paper.
(C) Transition of filter paper filtration capacity per unit time Comparing the filtration completion time per unit volume of filter paper that has been subjected to the same number of filtrations, the filter completion time of backwashed filter paper is the same as that of filter paper that has not been filtered. It can be seen that the filtration completion time was shorter than the time, and the sludge contained in the filter paper was removed by the back washing, and the clogging was reduced.

<Test-3>
(Purpose)
Verifies the operation of the automatic feed mechanism for the used filter paper after filtration by the sludge removal device.
(Experiment contents)
The sludge removal device 100 is connected to a machine tool and the operation defined below is confirmed.
[Definition]
The automatic rotation feed of the used filter paper is performed by manually rotating the end face of the unused roll paper set on the filter paper supply reel 42 between the steps of the vacuum filtration unit 10 → the sludge disposal unit 30 → the backwashing unit 50. To be mounted on the take-up reel 42.

  Thereafter, the paper is passed between the respective steps by the automatic rotation feed of the filter paper supply unit 40, and the filter paper used as the filter medium is automatically filtered at a constant rotation speed without breaking the used filter paper on the reel 42 on the winding side. Rewind.

  During the winding operation, the roll outer diameter of the filter paper supply reel 42 is continuously measured, and when the roll outer diameter reaches the set value, it is recognized as the end of the roll, and each of the reels 42 on the supply side and the winding side is turned over. I do. By repeating this reversing operation, automatic feeding of at least one reciprocation (two or more times of use of the filter paper) is carried out. (The operation is stopped by judging that the filter paper is clogged.)

（評価基準）
機能目標：濾過使用済み濾紙の自動送り
［定義］にて記述した自動運転動作を達成すれば、機能目標達成とする。 (Device connection environment)
Connected machine tool: Surface grinder (experimental conditions)
Filtration device setting conditions

(Evaluation criteria)
Functional goal: Automatic feeding of used filter paper If the automatic operation described in [Definition] is achieved, the functional goal is achieved.

(Discussion)
As a result of the experimental running, the reciprocating running: 5 times in total / the number of times of using the filter paper: 10 times in total was achieved by the automatic rotation of the used filter paper.

  Based on this result, filter paper from which solids and oils such as sludge contained in the coolant used in the machine tool have been removed is regenerated by backwashing, and can be used multiple times automatically up to the limit of filtration. It has been found that the operation can be realized by a sludge removing device.

  As described above, the invention made by the inventor has been specifically described based on the embodiment. However, 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-described embodiment, the case where the sludge removing device of the present invention is applied to removal of solid content or impure oil in a coolant liquid used in a grinding machine tool has been described. It can be widely used as a device for removing impurities such as solids and oils contained in water. In this case, it is only necessary to replace the filtering material according to the type of solids or oil, and therefore, it is not necessary to replace the mechanical parts.

10: Vacuum filtration unit 11: Filtration chamber unit 11
12R, 12L: drying section 13: piping 20: two-phase separation unit 21: oil-water separation section 21
22: Coolant liquid storage tanks 23, 24: Piping 25: Hydrophilic oil-repellent filter 30 (30R, 30L): Sludge disposal unit 31: Cover 32: Brush 33, 34, 35: Guide roller 36: Sludge disposal tank 37a, 37b, 37c: Gear 38: Belt 40 (40R, 40L): Filter paper supply unit 41: Filter paper 42: Reel 43: Laser sensor 44: Automatic rotation feed mechanism 50 (50R, 50L): Reverse cleaning unit 51: Reverse cleaning chamber 52: Drying unit 53: Cleaning liquid storage tank 60a, 60b, 60c: Water pump 61: Vacuum pump 70: Operation panel 71: Frame 80R, 81R, 82R, 83R, 84R, 85R, 86R, 87R: Guide rollers 80L, 81L, 82L, 83L, 84L, 85L, 86L, 87L: Dorora 100: sludge removal device

Claims (14)

A vacuum filtration unit that removes the impurities from the aqueous solution by filtering the aqueous solution containing impurities using a filter material under reduced pressure;
A two-phase separation unit that removes oil from the aqueous solution by filtering the aqueous solution that has passed through the filtering material using a hydrophilic oil-repellent filter,
A first sludge disposal unit that removes solids attached to the surface of the filter medium with the reduced pressure filtration unit;
A second sludge disposal unit that removes the solids attached to the surface of the filter medium with the reduced pressure filtration unit,
A first backwashing unit for backwashing the filter medium from which the solids have been removed in the first sludge disposal unit;
A second backwash unit for backwashing the filter medium from which the solid content has been removed in the second sludge disposal unit;
The filter material wound on a first reel is passed through the first backwashing unit, the first sludge disposal unit, the reduced pressure filtration unit, the second sludge disposal unit, and the second backwashing unit, and then the second backwashing unit. A first filter material supply unit for supplying the filter material supply unit;
The filter material wound on a second reel is passed through the second backwashing unit, the second sludge disposal unit, the reduced pressure filtration unit, the first sludge disposal unit, and the first backwashing unit through the second backwashing unit. Said second filter material supply unit for supplying to one filter material supply unit;
The first Filtration Material supply unit the filtration media, the first reverse cleaning unit, wherein the first sludge disposal unit, the vacuum filtration unit, wherein the second sludge disposal unit, the second reverse cleaning unit and the second filtration An automatic rotary feed mechanism that reciprocates between excess material supply units,
Sludge removal device provided with.   The sludge removing device according to claim 1, wherein the aqueous solution is an aqueous coolant liquid. The aqueous coolant liquid is supplied from a machine tool,
The sludge removing apparatus according to claim 2, wherein the aqueous coolant liquid from which the solid content and the oil content have been removed through the vacuum filtration unit and the two-phase separation unit is returned to the machine tool.   The aqueous solution from which the solid content and the oil content have been removed by passing through the reduced-pressure filtration unit and the two-phase separation unit as a washing liquid for back-washing the filter medium in the first back washing unit and the second back washing unit. The sludge removing device according to claim 1, wherein the sludge removing device is used.   The sludge removing device according to claim 1, wherein the filter material is filter paper or filter cloth having a retained particle diameter of 1 m to several tens m.   The sludge removing device according to claim 5, wherein the filter material is filter paper or filter cloth having a retained particle diameter of 1 µm to several µm, more preferably 1 µm.   The sludge removing device according to claim 1, wherein the reduced-pressure filtration unit includes a drying unit that removes moisture contained in the filter medium after the reduced-pressure filtration.   The sludge removing apparatus according to claim 1, wherein the first backwashing unit and the second backwashing unit each include a drying unit that removes moisture contained in the filter medium after the backwashing.   The sludge removing apparatus according to claim 1, wherein the back washing in the first back washing unit and the second back washing unit is performed under reduced pressure.   The sludge removing apparatus according to claim 1, wherein the filtration in the two-phase separation unit is performed under a reduced pressure of 0 to -100 kPa, preferably -1 kPa to -50 kPa.   The sludge removing device according to claim 1, wherein the removal of the solid content in the first sludge disposal unit and the second sludge disposal unit is performed by bringing a rotating brush into contact with a surface of the filter medium.   The first filter paper supply unit, the first backwashing unit, the first sludge disposal unit, the reduced pressure filtration unit, the second sludge disposal unit, the second backwash unit, and the second filter paper supply unit for the filter medium. 2. The sludge removing device according to claim 1, wherein the sludge is reciprocated a plurality of times. The second filter paper supplied from the first filter paper supply unit, passes through the first backwash unit, the first sludge disposal unit, the reduced pressure filtration unit, the second sludge disposal unit, and the second backwash unit. The filter medium traveling toward the supply unit is provided with moisture in the first backwash unit,
The first filter paper supplied from the second filter paper supply unit, passes through the second backwash unit, the second sludge disposal unit, the reduced pressure filtration unit, the first sludge disposal unit, and the first backwash unit. 2. The sludge removing device according to claim 1, wherein the filter medium traveling toward the supply unit is provided with moisture in the second backwash unit. 3. The sludge removal according to claim 1, wherein the filtration in the reduced pressure filtration unit and the first and second back washing units is performed under a reduced pressure of 0 to -100 kPa, preferably -1 to -50 kPa. apparatus.

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