JP2007098538A - Solid-liquid separation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact and simple constitution to considerably improve separation efficiency of foreign matter in a solid-liquid separation system capable of reproducing pure coolant liquid by separating and recovering the foreign matter from polluted liquid mixed with foreign matter such as cutting chips and sludge. <P>SOLUTION: A horizontal tank of a scraping conveyor is arranged in an upper part of a precipitating tank. By filtering the coolant liquid by making the bottom in the horizontal tank as a punching filter, for instance, most of oil in the coolant liquid is separated in the filter part and is adhered to comparatively large foreign matter, and thereby the oil is separated and recovered without dripping by the scraping conveyor. Precipitation and separation in the precipitating tank therefore is promoted, foreign matter of different sizes can be efficiently separated and recovered by the scraping conveyor and precipitating tank. As a result, the separation recovery efficiency of foreign matter becomes equal or more as compared with that in a constitution of multistage filtration. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an individual liquid separation system capable of regenerating clean coolant liquid by separating and collecting mixed foreign substances in at least two stages from a contaminated liquid mixed with foreign substances such as cutting chips and sludge like a coolant liquid for machine tools and the like. The present invention relates to an individual liquid separation system that is excellent in the separation and recovery efficiency of the foreign matter, can significantly reduce the moisture content of the foreign matter separated in the first stage, and is extremely compact and low in running cost.

  In order to cool a workpiece or a cutting tool and collect machining waste during cutting or grinding, it is common to use water or a liquid made into a required condition by containing a specific oil in water as a coolant liquid. The used coolant liquid is recycled by separating and removing foreign matters such as processing waste. Further, the processing waste is separated and recovered because, for example, a metal material can be reused as the same material.

  On the other hand, the used coolant contains various oils such as dust, rust preventive oil for workpieces, lubricating oil for machine tools, etc. in addition to processing waste. However, not only the lubrication performance of the coolant is deteriorated, but also environmental and hygiene problems occur thereafter.

  Conventionally, as a drum filter type filtration device that separates chips from coolant liquid after use, chips precipitated from the coolant liquid charged in a storage tank having an inclined surface are disposed above the inclined surface from the tank bottom surface. A scraper conveyor that sweeps the chips toward the downstream side of the discharge port is provided, a filtration filter is provided at the intersection of the horizontal part and the inclined part of the scraper conveyor, and the coolant liquid filtered by the filtration filter is provided outside the storage tank. A configuration for causing the water to flow out is proposed (Patent Document 1).

In addition, as an individual liquid separator for separating chips and coolant, a magnetic separator for removing magnetic chips is provided, and the coolant that has passed through the separator is vortexed by a circulation pump in the tank. A cyclone device comprising a circular vortex coolant tank for agglomerating the residual sludge in the tank, and then removing the residual sludge by applying centrifugal force to the sludge by rapidly swirling the coolant sucked together with the agglomerated sludge from the tank In addition, there has been proposed a configuration in which a residual sludge discharged from a cyclone apparatus is combined with a sludge settling tank that precipitates and extracts (Patent Document 2).
JP2002-177713 JP2003-275938

  The drum filter filtration device basically has a configuration of a storage tank having an inclined surface, and the space occupied is only an installation location dimension of the storage tank. On the other hand, the separation capacity is that the chips are separated by sedimentation in the storage tank and collected by filtration with a filtration filter, so the coolant to be separated is cleaned to some extent, but the collection efficiency of chips is limited only by sediments. Therefore, a high separation rate cannot be obtained.

  In addition, the chips and the like scraped up by the scraper have a high content of coolant, which not only makes disposal difficult, but also increases the amount of coolant that is taken out of the system, which necessitates replenishment. Furthermore, frequent replacement of the filtration filter is necessary, and even if lubricating oil from the machine tool is mixed in the apparatus, it cannot be removed, and it is necessary to periodically clean the total coolant replacement device. There is a problem that a strange odor is generated due to the propagation of bacteria in the tank.

  Combining a magnetic separator, vortex-type agglomeration tank, cyclone device, and sludge settling tank can increase the separation and recovery rate of chips and increase the life of the liquid and the interval between tank cleaning. Although there is an advantage, the removal of the coolant to the outside of the magnetic separator and the sludge settling tank and the generation of a strange odor are not eliminated, and furthermore, the installation location of four types of filtration devices is necessary and their maintenance is greatly Cost and labor, and it is difficult to say that it is preferable in terms of cost effectiveness.

  The present invention relates to a separate liquid separation system that can regenerate clean coolant liquid by separating and recovering foreign substances such as cutting chips and sludge mixed with foreign substances such as machine tool coolant liquids. Maintenance of maintenance such as cleaning, long life of liquids can be achieved, and the individual liquid separation system has a structure that is as compact and simple as possible, and that can greatly improve the separation efficiency of foreign substances. The purpose is to provide.

  The inventors aim to achieve a configuration that can be easily and compactly made without complicating the configuration, such as connecting a plurality of filtration means in series, and that can separate and collect cutting chips and sludge with high efficiency. In order to separate the swarf from the waste liquid and discharge it to the outside of the machine as much as possible, focus on combining a sediment conveyor with a sediment separation function and a sedimentation tank. did.

  Furthermore, as a result of intensive studies on this configuration, the inventors have arranged a horizontal tank of a scraping conveyor on the upper part of the precipitation tank, and filtered the contaminated liquid using the horizontal tank bottom as a punching filter, for example. It is possible to efficiently separate and collect foreign substances of different sizes in the scraping conveyor and the sedimentation tank, and in particular, the foreign substances separated in the horizontal tank can be separated and collected in a much dry state compared to the conventional, It has been found that oil in the contaminated liquid adheres to the separated foreign matter and can be separated, and the mixing of oil into the sedimentation tank can be significantly reduced.

  The inventors further include, in the settling tank, by providing a liquid jetting means for causing a water flow in the liquid in the settling tank, and a pump suction unit for sucking and collecting foreign matter precipitated on the bottom of the settling tank, for example. The present invention was completed by discovering that fine foreign matters can be efficiently separated and recovered in the sedimentation tank.

  That is, the present invention includes a horizontal tank that filters and drops the charged contaminants through a filter portion provided on all or part of the bottom surface, and an inclined ascending tank in which an inclined surface is continuously raised from the bottom surface of the horizontal tank. And a scraping separation tank having a discharging means for scraping and discharging the foreign matter trapped on the filter part to the upper end part of the inclined ascending tank, and falling from the filter part disposed at the lower part of the horizontal tank And a sedimentation tank for precipitating and separating fine foreign substances in the filtrate.

Further, the present invention provides an individual liquid separation system configured as described above,
The filter section is a plate material that arranges many small holes, a mesh filter, or a plate material that arranges slit holes,
The small hole or mesh of the filter part has a configuration in which the inner diameter is in the range of 0.1 mm to 1.5 mm,
The slit hole of the filter part is configured so that the hole width is in the range of 0.1 mm to 1.5 mm,
The settling tank comprises a liquid injection means for causing a water flow in the liquid in the settling tank, and a pump suction unit disposed in the liquid from the top of the tank for sucking and collecting the foreign matter precipitated on the bottom of the settling tank,
The settling tank comprises a liquid injection means for causing a water flow in the liquid in the settling tank, and a pump suction unit arranged in the tank for sucking and collecting foreign matter precipitated on the bottom of the settling tank,
The sedimentation tank is proposed with a rectangular bottom surface and a structure in which the tank depth is shallower than the long and short sides of the bottom surface.

  In this invention, space can be saved by arranging the horizontal tank and the sedimentation tank of the freight separation tank vertically, and the vertical arrangement of this tank can be achieved by providing a filter part at the bottom of the horizontal tank. Most of the foreign matter can be separated and removed immediately, etc., and the separated foreign matter can be sufficiently drained and discharged to the upper end of the inclined ascending tank, and dry foreign matter can be collected. The coolant liquid after passing through the filter section can be dropped into a sedimentation tank to precipitate and separate fine foreign matters in the liquid, and the filtration target in the horizontal tank and the sedimentation tank can be made large and small. Since it can be divided, there is an advantage that the separation and recovery is efficient in each tank.

  For example, oil components that are difficult to separate and collect in a separation tank equipped with a normal scraping conveyor often adhere to foreign substances and float on the foreign matter, but according to the configuration of the horizontal tank of the present invention, the bottom filter section As a result of the flow in the direction, most of the oil in the coolant liquid is separated and collected by the freight conveyor by adhering to the relatively large foreign matter that settles and separates in the filter section. However, the foreign matter separation and recovery efficiency is extremely good, equivalent to or better than that of the multi-stage filtration. Therefore, according to the present invention, there is no off-flavor generation in the apparatus, cleaning is almost unnecessary, maintenance-free operation, and longer liquid life can be achieved.

  This invention is frequently worn or clogged with mobile devices such as a scraping conveyor for a scouring separation tank, a water flow forming jet for promoting precipitation in a sedimentation tank, and a suction pump for sedimented foreign matter. Therefore, there is an advantage that both a long-term stable operation and a long maintenance interval are compatible.

  In the present invention, the scraping separation tank has any inclined rising tank in the horizontal tank into which the sewage is introduced, and any known substance can be used as long as the foreign matter on the bottom of the horizontal tank is scraped up and discharged to the inclined rising tank. The configuration can also be adopted.

  The horizontal tank into which the sewage is introduced needs only to be able to arrange a conveyor that can sweep the bottom of the tank by passing a scraper of the required width between two parallel chains, such as a sprocket on one end of a rectangular horizontal tank. By providing the turning part and connecting the inclined rising tank to the other end, it is possible to arrange a scraping conveyor that scrapes and discharges foreign matter on the bottom of the horizontal tank to the inclined rising tank.

  The scraping conveyor can adopt any known configuration in addition to the above-described configuration as long as the foreign matter on the bottom of the horizontal tank can be conveyed by the scraper. In addition, the scraper can be appropriately selected according to the shape, size range, material, and the like of the chip to be separated and removed, such as the form and aperture ratio of the filter unit described later, regarding the material, shape, and the like.

  The filter part provided on all or part of the bottom surface of the horizontal tank is used to classify foreign matters such as chips in the sewage liquid such as coolant liquid into large and small plates, plate materials with many small holes arranged, mesh filters, various sizes It can be configured with a filter such as a plate that arranges slit holes. For example, depending on the shape, size range, material, etc. of chips to be separated and removed, the inner diameter of the small hole, the opening diameter of the mesh, the hole width of the slit And their arrangement can be selected as appropriate. In any case, since the scraper described later scrapes and conveys foreign matters such as chips that do not pass through the filter at the bottom of the horizontal tank, it is desirable that the filter portion hardly obstructs the eyes or the scraper.

  The small holes of the filter portion in which a large number of small holes are arranged preferably have an inner diameter in the range of 0.1 mm to 1.5 mm, and more preferably in the range of 0.2 mm to 1 mm, and 0.3 mm to 0.6 mm. The mesh and the slit hole preferably have the same opening diameter and hole width, and the slit length is preferably shorter.

  In addition, the filter unit can be provided at a part or almost the entire surface of the horizontal tank bottom of the scraping and separating tank, and the amount of sewage charged into the horizontal tank is stored in the sedimentation tank. The installation area, the aperture ratio, etc. can be selected as appropriate in consideration of the amount and the demand for cleaning liquid.

  In the present invention, any known configuration can be adopted for the sedimentation tank as long as it can accommodate the sewage dropped from the scraping separation tank disposed in the upper part and precipitate and separate foreign substances in the liquid.

  For example, by forming meandering and vortex flow in the sedimentation tank, the composition of the tank bottom or the required filter part to promote the precipitation and accumulation of foreign substances, partitioning the tank, forming the tank bottom in a mortar shape, Various configurations such as appropriately arranging the liquid injection nozzle in the tank and further providing a non-drive or drive type stirring propeller can be employed.

  The collection of foreign matter that has settled, aggregated, or accumulated in the sedimentation tank is collected with the clean liquid by using a suction port provided on the bottom or side wall of the tank or a pump suction port located in the liquid from the top of the tank. Can be discharged.

  In addition, the sedimentation tank can be round, polygonal, rectangular, or various shapes depending on the installation location, and the sedimentation tank has one sedimentation tank for one scraping separation tank. A plurality of scraping separation tanks can be arranged on one tank, or the precipitation tanks can be arranged in a tandem or parallel multi-tank arrangement in order to precipitate in multiple stages. In addition, as shown in the examples, the sedimentation tank has a rectangular bottom surface and a shallower depth than the long and short sides of the bottom surface. can do.

  Furthermore, the cleaning liquid separated and filtered in the settling tank can be subjected to microfiltration with a cleaning device using another filtering filter, if necessary.

  The configuration shown in FIGS. 1 and 2 is an individual liquid separator mainly composed of a rectangular sedimentation tank with a shallow water depth, which can be easily installed in a normal factory or the like. The rectangular precipitation tank 1 rounded only at the four corners of the tank is integrated with the cleaning liquid tank 2 on the short side to form the required rectangular liquid tank 3, which is placed on the floor at the four corners. The casters and height adjusters are installed.

  A horizontal tank 5 of the separation tank 4 and an inclined ascending tank 6 connected to the horizontal tank 5 are placed in the long side direction of the upper half of the upper surface of the precipitation tank 1, and three filter plates 7 are arranged on the bottom surface of the horizontal tank 5. Then, the coolant liquid from the processing apparatus is introduced from the inlet 8 provided on the left side and upper right side of the horizontal tank 5 in the drawing, passes through the filter plate 7 on the bottom surface of the horizontal tank 5 and falls into the precipitation tank 1.

  Although not shown in the figure, a circular plate or guide plate disposed at the left end of the horizontal tank 5 and the lower end of the inclined ascending tank 6, and a two-strand chain meshing with a sprocket pivotally disposed at the upper end of the inclined ascending tank 6 An endless conveyor is formed, and a scraping conveyor that can sweep the bottom of the tank by passing a scraper of the required width between the two chains is configured.

  The scraper of the scraping conveyor scoops up the foreign matter that has settled from the bottom of the horizontal tank 5, particularly on the filter plate 7 and from the lower end to the upper end of the inclined ascending tank 6, and discharges it from the tank top 9. By providing a horizontal portion and a falling slope at the tank top portion 9 and providing a cover-type shutter 21 that opens and closes intermittently at the drive motor 22 of the conveyor, it is possible to drain liquid from the foreign matter that is scraped up and discharged.

  Here, the filter plate 7 is provided on a part of the bottom surface of the horizontal tank 5, and is formed of a punching filter in which a large number of small holes having a required inner diameter are arranged at a predetermined pitch.

  In the sedimentation tank 1, the liquid in the tank is pumped up by the pump 10, and sprayed from the four spray nozzles 15 arranged along the short side wall and the long side wall in the tank. It consists of the structure which forms and deposits a foreign material to the center part bottom in a tank. As the eddy current means, any known means such as a small screw propeller can be used in addition to the above-described liquid jet nozzle. Further, the vortex flow direction can also be appropriately selected according to, for example, the pump spindle rotation direction.

  In addition, in the sedimentation tank 1, the pump 11 disposed in the liquid from the upper center of the tank has a suction port 12 for sucking and collecting foreign matter deposited on the bottom surface of the precipitation tank at the lower end thereof, A propeller 14 is pivotally supported on the body 13 so as to be rotatable.

  This propeller 14 has a rectangular plate shape with its thickness end face directed to the bottom, and can be similarly swung in the clockwise vortex flow without contacting the tank bottom. The scraper provided partially has a function of collecting foreign matter deposited on the bottom surface of the sedimentation tank to the suction port 12 by sweeping foreign matter on the bottom surface of the tank.

  Since the liquid from the suction port 12 in the sedimentation tank 1 contains foreign matter, it is separately filtered through a filter to separate and collect the foreign matter, and the filtered liquid is returned to the precipitation tank 1. In the sedimentation tank 1, the cleaning liquid in the tank 1 is filtered by, for example, a tower-type filtration device 20 shown in the figure, and the filtered liquid is put into the cleaning liquid tank 2. The cleaning liquid pumped up by the pump 17 of the cleaning liquid tank 2 is supplied again as a coolant liquid to the processing apparatus, for example.

  Further, the cleaning liquid can be pumped up by another pump 18 and used as a backwashing liquid for the filter of the filtration device 20, and can be put into the sedimentation tank 1 again.

  In the sedimentation tank 1, a known oil skimmer 16 can be used in combination as shown. Furthermore, the settling tank 1 can be provided with a plurality of pumps and supplied as a cleaning liquid for a bed or jig of a processing apparatus.

  Considering not only the amount of sewage charged into the horizontal tank 5 but also the amount of sewage retained in the settling tank 1 and the demand for the cleaning liquid, such as when used as the cleaning liquid, the precipitation tank 1 and the cleaning liquid The tank 2 is equipped with a liquid level gauge 19 and controlled so that the liquid level falls within a predetermined range.

In the embodiment of the individual liquid separation system having the configuration shown in FIGS. 1 and 2, the scraping separation tank has a scraping conveyor speed of about 2 m / min, a punching filter hole inner diameter of 0.5 mm, and a punching filter area of about 0.5 m. ² , the precipitation tank had a volume of 800 l, and a microfiltration apparatus using a nonwoven fabric filter for filtering the cleaning liquid was used as the final stage. Using water-diluted coolant, powdered and curled aluminum chips were removed, and a throughput of about 200 l / min was obtained as a cleaning ability. Under these conditions, continuous operation was performed for 1 year and 6 months.

  For comparison, except that the bottom of the tank is a normal plate surface and the propeller of the settling tank is not arranged, the above-mentioned scraping and separating tank of the same specification is used, and the same settling tank and microfiltration device are used. Using a filter connected in series so that the liquid can flow to the microfiltration device using a filter, remove the powdery and curled chips using the same coolant solution, about 200 liters A continuous operation of 1 year and 6 months was performed so that a throughput of / min could be obtained.

  In order to obtain the same processing amount as that of the individual liquid separation system of this embodiment and to operate continuously, the comparison device is replaced weekly with the non-woven fabric filter in the scraping separation tank, the oil skimmer in the precipitation tank, and the microfiltration device. The filter change and cleaning intervals were significantly shorter and had to be done almost every week. In addition, it was necessary to replenish 25 to 30 liters of coolant liquid every week by taking out the coolant liquid in the scraping and separation tank, and it was necessary to replace and clean the liquid due to a strange odor in about 10 months. .

  On the other hand, in the embodiment of the individual liquid separation system of the present invention, it is needless to say that the nonwoven fabric filter in the scraping separation tank is unnecessary, and the aluminum chips discharged after being filtered by the punching filter section are well drained. The replenishment was 8-10 liters per week. Moreover, there was no off-flavor even after 1 year and 6 months, and there was no need to clean the entire device and replace the liquid.

  That is, in this embodiment, the chips, sludge and oil removed by the filter part at the bottom of the horizontal tank of the scraping separation tank are efficiently recovered, so the oil skimmer and the filter of the microfiltration device in the sedimentation tank are soiled. It became clear that there was little. In addition, the inflow of oil in the settling tank is suppressed, and agglomeration and collection of fine chips proceeds by the vortex, so that the generation of bacteria is suppressed and the life of the coolant is extended.

  As apparent from the examples, the present invention can not only save space by arranging the horizontal tank and the sedimentation tank of the freight separation tank up and down, but it can also be filtered by a filter section provided at the bottom of the horizontal tank. The target can be classified into large and small, and a synergistic effect that greatly exceeds the separation ability of foreign substances obtained in the conventional flotation separation tank and sedimentation tank is obtained, and most of the oil in the coolant is separated by the filter part into relatively large foreign substances. By adhering, it can be separated and collected with a scraping conveyor with good squeeze, so that the precipitation separation in the settling tank is promoted, and the separation and collection efficiency of foreign matters becomes equal to or more than that of the conventional multistage filtration configuration.

It is front explanatory drawing which shows the structural example of the separate liquid separation system by this invention. It is a top surface explanatory view showing the example of composition of the individual liquid separation system by this invention.

Explanation of symbols

1 Sedimentation tank
2 Cleaner tank
3 liquid tank
4 Scraping separation tank
5 Horizontal tank
6 Inclined ascending tank
7 Filter plate
8 Introduction
9 Tank top
10,11,17,18 pump
12 Suction port
13 Torso
14 Propeller
15 Injection nozzle
16 Oil skimmer
19 Level gauge
20 Filtration equipment
21 Cover shutter
22 Drive motor

Claims (7)

A horizontal tank for filtering and dropping the charged contaminants through a filter part provided on the whole or a part of the bottom surface, an inclined ascending tank having an inclined surface continuously raised from the bottom surface of the horizontal tank, and on the filter part A scraping separation tank having a discharging means for scraping and discharging the foreign matter trapped in the upper part of the inclined ascending tank, and a filtrate falling from the filter unit disposed in the lower part of the horizontal tank. And a settling tank for separating and separating fine foreign substances in the filtrate. 2. The individual liquid separation system according to claim 1, wherein the filter part is any one of a plate material in which a large number of small holes are arranged, a mesh filter, and a plate material in which slit holes are arranged. 3. The individual liquid separation system according to claim 2, wherein the small hole or mesh of the filter part has an inner diameter in the range of 0.1 mm to 1.5 mm. 3. The individual liquid separation system according to claim 2, wherein the slit hole of the filter part has a hole width in the range of 0.1 mm to 1.5 mm. The precipitation tank comprises liquid injection means for causing a water flow in the liquid in the precipitation tank, and a pump suction unit disposed in the liquid from the upper part of the tank for sucking and collecting foreign matter precipitated on the bottom surface of the precipitation tank. Individual liquid separation system as described. 2. The individual settling device according to claim 1, wherein the settling tank includes a liquid jetting means for causing a water flow in the liquid in the settling tank, and a pump suction unit arranged in the tank for sucking and collecting foreign matter precipitated on the bottom surface of the settling tank. Liquid separation system. 7. The individual liquid separation system according to claim 5, wherein the sedimentation tank has a rectangular bottom surface and a shallower tank depth than the long side and the short side of the bottom surface.

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