JP4609265B2 - Filtration apparatus and filtration method - Google Patents

Description

  The present invention relates to a filtration device and a filtration method for collecting impurities in a liquid and purifying the liquid, and in particular, for hot and warm forging consisting of an aqueous solution or an oily liquid in which a lubricant such as graphite powder is dispersed. The present invention relates to a filtration apparatus and a filtration method suitable for recovery and regeneration of a release agent.

  The release agent collected from the forging machine contains impurities such as iron oxide film (scale) that has been peeled off from the steel ingot and hydraulic fluid that has leaked from the hot forging machine. A method of reusing a release agent for hot forging that can be reused as a mold release agent by removing it has been proposed (see Patent Document 1).

In this method, the recovered release agent is supplied to the magnetic separator while stirring, and the oxidized scale in the recovered release agent is removed by being adsorbed by a magnetic force.
International Publication WO00 / 03820

  However, as in the above conventional example, if necessary, a part of the recovered liquid in the tank is supplied to the magnet separator by a pump to separate the oxide scale contained in the recovered liquid, and the recovered recovered liquid after the oxide scale separation is again In the method of returning to the recovery tank, there is a problem that the oxide scale component in the recovery liquid in the recovery tank can be reduced only gradually. In addition, when a spray nozzle is used as an ejection port for a release agent, it is necessary to remove impurities (dust, burned lubricant, etc.) that are large in the ejection port.

  In order to solve this problem, a method of supplying the recovered liquid to a filtration device equipped with a filter and separating the oxide scale in the recovered liquid with the filter is conceivable. However, the release agent is a lubrication of fine particles mainly composed of graphite or the like. Since it is composed of an aqueous solution in which the agent is dispersed, when the flow state is stopped, precipitation starts in a state where the lubricant component such as graphite and oxide scale are mixed, and the precipitate removes impurities. In addition to making the filter difficult, problems such as clogging of the filter and solidification in the filtration container are expected. This problem frequently occurs in filtration devices that are used as needed, and even in filtration devices that are always in use, as impurities are removed, part of the filter begins to clog and occurs in clogged areas. To do.

  Then, this invention was made | formed in view of the said problem, and it aims at providing the filtration apparatus and filtration method suitable for the oxidation scale separation in collection | recovery mold release agents.

In the present invention, a filter for filtering impurities is arranged in a container, a stock solution containing impurities is supplied to one chamber partitioned by the filter via an inlet pipe, and an outlet pipe is connected from the other chamber partitioned by the filter. In the filtration device that discharges the liquid obtained by filtering the impurities through the filter, the container constituting the filtration device is formed by a cylindrical drum arranged with its axis center inclined in the horizontal direction or the horizontal direction. Then, the surface of the stock solution containing impurities and the liquid surface of the filtered liquid are present in the drum, the liquid in the drum is made to flow by rotating the drum around the axis , and the inner surface of the drum and the filter surface are liquid. Impurities that peel off impurities adhering to the drum inner surface and filter surface and return to the liquid respectively by alternately repeating the time when it is located in the surface and the time when it is located outside the liquid surface. There was so prevents the precipitation.

Therefore, in the present invention, the container constituting the filtration device is formed by a cylindrical drum arranged with its axis center inclined in the horizontal direction or the horizontal direction, and the stock solution containing impurities in the drum In addition, the liquid level of the filtered liquid is made to exist and the drum is rotated about its axis to cause the liquid in the drum to flow , and when the drum inner surface and the filter surface are positioned within the liquid level and outside the liquid level. In order to prevent the impurities adhering to the drum inner surface and the filter surface from peeling off and returning to the liquid, thereby preventing the impurities from precipitating . Sedimentation into the filter can be suppressed, the entire filter surface can be used without clogging the filter unnecessarily, and the problem of solidifying in the filtration container can be solved.

  Hereinafter, an embodiment of a filtration device and a filtration method of the present invention is described based on FIGS.

  1 and 2 are a transverse sectional view and a longitudinal sectional view showing a first embodiment of a filtration apparatus to which the present invention is applied, FIG. 3 is a schematic view of a filtration system to which the filtration apparatus is applied, and FIG. 4 is a second view of the filtration apparatus. Sectional drawing which shows an Example, FIG. 5 is the schematic of 3rd Example of a filtration apparatus, FIG. 6 is schematic of 4th Example of a filtration apparatus.

  1 and 2, the filtration device of the first embodiment is a cylindrical shape that is attached to a drum 1 constituting a cylindrical container and a partition wall 2 that partitions the inside of the drum 1 and partitions the inside of the drum 1 into two chambers. Filter 3, inlet pipe 4 for supplying a liquid before filtration containing impurities from the bottom of drum 1 to one chamber partitioned by filter 3, and the other of drum 1 constituting the other chamber partitioned by filter 3 An outlet pipe 5 for discharging the liquid after filtering the filter 3 from the bottom, a rotation support device 6 that rotatably supports the drum 1, and a rotation drive device 7 that rotationally drives the drum 1 that has become rotatable. .

  The drum 1 includes a main body portion formed in a bottomed cylindrical shape in which a cylindrical plate 1A and a bottom plate 1B are integrally formed, and a lid 1C fixed by fixing means 1D such as a bolt so as to close an opening of the main body portion. And constitutes a cylindrical container. The lid 1C is configured to be fixed to a flange fixed to the opening of the cylindrical plate via fixing means 1D, and can be detached from the main body portion by removing the fixing means 1D. This makes it possible to clean and remove the filter 3 and the like. An inlet pipe 4 is opened at the center of the bottom plate 1B, and an outlet pipe 5 is opened at the center of the lid 1C. Further, a discharge pipe 1E is connected to the bottom plate 1B across the cylindrical plate, and the discharge pipe 1E is adjusted with the rotation position of the drum 1 adjusted so that the discharge pipe 1E is positioned at the lowest position of the drum 1 container. By opening, the contents in the drum 1 container can be discharged.

  A pair of rails 6 </ b> A are fixed to the outer periphery of the cylindrical plate 1 </ b> A of the drum 1, and the pair of rails 6 </ b> A are rotatably supported by rollers 6 </ b> B of the rotation support device 6. On the outer periphery of the cylindrical plate 1A, a ring gear 7A is fixed in a circumferential shape, and the drum 1 is configured to be rotationally driven by meshing with a pinion 7B of the rotation driving device 7. A ring-shaped partition wall 2 is fixed to the inner wall of the cylindrical plate 1A of the drum 1. A flange fixed to the open end of the bottomed cylindrical filter 3 is fixed to the inner periphery of the partition wall 2 by a fixing means such as a bolt. Prepare fixedly.

  The filter 3 includes a filter surface in a bottomed cylindrical shape. The size of the mesh constituting the filter surface allows the passage of fine particles such as graphite dispersed in a release agent, while the iron oxide film (oxide scale) having larger particles than the graphite peeled off from the steel ingot The size is set to block the passage of impurities such as. When a spray nozzle is used as the ejection port for the release agent, one that is smaller than the ejection port hole is selected.

  The inlet pipe 4 and the outlet pipe 5 allow relative rotation between the part that can rotate together with the drum 1 and the non-rotating supply pipe and discharge pipe via rotary joints 4A and 5A. It is configured to do.

  The rotation support device 6 includes a plurality of pairs of rollable rollers 6B disposed on a foundation, and the rollers 6B roll at a plurality of locations (two locations in the figure) with respect to the respective rails 6A of the drum 1. The drum 1 is supported so as to be able to rotate on the spot. Therefore, when the drum 1 is rotationally driven by the rotational driving device 7, the drum 1 is rotated with the rail 6A in contact with the roller 6B.

  The operation of the filtration device having the above configuration will be described below.

  FIG. 3 shows a release agent regeneration system to which the filtration device of the present embodiment is applied. The recovery tank 10 for storing the release agent containing impurities discharged from the forging device and the release agent from which impurities have been separated are shown. A process for separating the impurities from the release agent stored in the recovery tank 10 and supplying the reuse liquid supply tank 11 to the reuse liquid supply tank 11. Used in. Stirring devices 10A and 11A are installed in the respective tanks 10 and 11, and are constantly stirred so that the lubricant composed of fine particles dispersed in the release agent does not precipitate.

  When the filtration device is operated, the release agent stored in the collection tank 10 is pumped up by the pump 10B, supplied to the inlet pipe 4 of the filtration device, and introduced into the drum 1 of the filtration device. At the same time, the rotation driving device 7 is operated to rotate the drum 1.

  The mold release agent introduced into the drum 1 contains a lubricant composed of dispersed fine powder and impurities such as oxide scale in a dispersed manner, and from the dispersed fine powder when passing through the filter 3. The lubricant can pass through the mesh of the filter 3, but impurities having a large particle size such as oxide scale are prevented from passing through the mesh of the filter 3 and adhere to one side of the filter 3 or are dispersed again in the release agent. Or The release agent from which the impurities that have passed through the filter 3 are separated is supplied from the outlet to the reuse liquid supply tank 11.

  Since the filter 3 integrated with the drum 1 is rotated together with the drum 1 by the rotation driving device 7, the time when the filter 3 is located inside the liquid surface of the release agent and the time when it is located outside the liquid surface are alternately repeated. The working surface of the filter 3 with respect to the mold release agent passing through is sequentially renewed. For this reason, the impurity separation function with respect to a mold release agent can be exhibited on the filter 3 whole surface.

  Further, since the drum 1 is rotated by the rotation drive device 7, as shown in FIG. 2, the cylindrical inner wall surface rises on the one hand and falls on the other hand. For this reason, the mold release agent in the drum 1 moves at the same high speed as the wall surface with respect to the movement due to the rotation of the inner wall surface of the drum 1, and the drag force from the wall surface as it moves away from the wall surface. Decreases and the movement speed slows down. Also, in the liquid at the outer peripheral portion that is dragged and moved by the wall surface, on the side where the wall surface becomes higher than the liquid surface of the release agent, the liquid surface is separated from the wall surface by moving away from the wall surface (drum center side). In the direction where the wall surface becomes lower than the liquid level of the release agent, the release agent is drawn downward from the liquid surface, and the liquid surface is drawn toward the wall surface side (from the drum center side). Flowing. The same action occurs on the bottom surface of the drum 1 and the inner surface of the lid.

  At the same time, on the surface of the filter 3 that rotates together with the drum 1, as with the inner surface of the drum 1, the portion in contact with the surface of the filter 3 moves at the same high speed as the filter surface, and from the filter surface as it moves away from the filter surface. The drag force is reduced and the moving speed is slowed down. In addition, even in a mold release agent that is dragged and moved by the filter surface, on the side where the filter surface is higher than the liquid surface of the mold release agent, the liquid surface is moved away from the filter surface in a direction away from the filter surface. In addition, on the side where the filter surface is lower than the liquid level of the release agent, the release agent is drawn below the liquid level and flows toward the direction of drawing the liquid level surface toward the filter surface. A similar effect occurs on the bottom surface of the filter 3.

  With the above action, a circulating flow is generated by contact between the wall surface of the drum 1 and the surface of the filter 3 in the release agent in any chamber before and after passing through the filter 3 in the drum 1. For this reason, the fine powder lubricant dispersed in the release agent can prevent precipitation caused by the release agent resting in the drum 1.

  When the required amount of impurities is separated from the release agent, the pump 10B is stopped and the supply of the release agent from the recovery tank 10 is stopped. However, since the release agent already supplied exists in the filtration device, the rotation of the drum 1 is continued without stopping the rotation drive device 7. For this reason, even when the filtration device is not used, it is possible to prevent the lubricant composed of the fine particles contained in the release agent in the drum 1 from being precipitated.

  When the filtration operation is not expected over a long period of time or after a predetermined amount of filtration operation is performed, cleaning in the drum 1 and regeneration of the filter 3 are performed. In this case, the drum 1 is stopped at a predetermined angle, the release agent in the drum 1 is discharged to the tank 12 from the drain port 1E, the drain port 1E is closed, and the drum 1 is rotated by the rotation driving device 7. A predetermined amount of cleaning liquid, for example, cleaning water from the cleaning water tank 13 is introduced into the drum 1 from the outlet pipe 5 by switching the valve 14. The drum 1 is rotated for a predetermined time in a state where the discharge of the washing water from the drum 1 to the inlet pipe 4 is stopped. In the drum 1, the release agent and impurities adhering to the inner wall surface of the drum 1 are washed away by the washing water, and the release agent and impurities adhering to the filter 3 are also washed away in the washing water and washed away in the washing water. Agents and impurities are mixed. In this state, the drum 1 is stopped at a predetermined angle, and the cleaning water in the drum 1 is discharged as drainage from the drain port 1E to complete the cleaning.

  Even when the filter 3 built in the drum 1 is clogged, the above cleaning operation is started, and the cleaning of the drum 1 and the filter 3 is executed. In this case, the reduction of the impurity removal efficiency due to the clogging of the filter 3 can be determined, for example, by installing a pressure gauge in the piping before and after the filtration device, and judging whether or not to wash by the differential pressure. Good. In order to reduce the clogging frequency of the filter 3, a magnetic separator as described in International Patent WO 00/03820 is added to the tank 10, or a magnet filter is disposed in the path between the pump 10 </ b> B and the drum 1. May be.

  FIG. 4 shows a second embodiment of the filtration device. In the filtration device of the embodiment shown in FIG. 1, the drum 1 positioned horizontally is provided, but the drum 1 in this embodiment has its axis. Are arranged in an inclined manner. Also in the filtration apparatus including the drum 1 arranged in such an inclined manner, a circulation flow of the release agent in the drum 1 due to the rotation of the drum 1 is generated, and the release agent as in the first embodiment. Precipitation of the lubricant composed of fine particles dispersed therein can be suppressed.

  In the embodiment described above, the filter 3 of the filtration device is described as using a single bottomed cylindrical filter 3 concentrically with the axis of the drum 1. A plurality of (two or more) bottomed cylindrical filters may be arranged at equiangular intervals around the axis of the drum 1, and in that case, a new separation in the drum 1 may be provided by the filter itself. The action of stirring the mold is added, the flow of the mold release agent in the drum 1 can be further strengthened, the precipitation of the lubricant can be further prevented, and the same stirring state can be obtained. Therefore, the rotational speed of the drum 1 itself can be reduced.

  Moreover, in the said Example, when supplying the mold release agent collect | recovered to the filtration apparatus, although it is made to supply with the pump 10B attached to the collection tank 10, although not shown in figure, when the viscosity of a mold release agent is low In this case, a filtration device may be disposed below the recovery tank 10, and supply and stop of the release agent may be switched by opening and closing a valve disposed in the inlet pipe 4, and the viscosity of the release agent is high. In that case, a powerful pump may be disposed in the collection tank 10 to pump the release agent to the filtration device.

  The third embodiment of the filtration device shown in FIG. 5 is different from the first and second embodiments in the configuration in which the planar filter 8 is used as the filter to be used. The configuration is the same as in the second embodiment. In this embodiment, the generation of the circulation flow due to the contact of the filter 8 with the release agent is slightly weakened, but the effect of the circulation flow generation on the release agent on the inner surface of the drum 1 is not changed, and the circulation by the inner wall surface of the drum 1 is performed. The flow can suppress precipitation of the fine-particle lubricant dispersed in the release agent.

  In the above embodiment, the filter 8 using the single flat filter 8 is described as the filter 8 of the filtration device. However, although not shown, a plurality of flat filters are arranged in the drum 1 in series. In that case, the size of the mesh is changed in multiple stages from the inlet pipe 4 side to the outlet pipe 5 side, and the passage of the largest particles of impurities is passed through the first-stage filter. The second-stage filter is used to block the passage of impurities of the next larger particle, and the meshes having successively smaller mesh sizes are arranged. By changing the mesh size in multiple stages in this way, at the time of cleaning with the cleaning liquid introduced from the outlet pipe 5, impurities up to the size of particles that do not pass through the final stage filter are returned to the drum 1 inlet side. It can be discharged.

  In the improved filtration apparatus of the fourth embodiment shown in FIG. 6, a large number of fins 9 are provided on the inner wall surface of the drum 1 and / or the inner surface of the filter 3, and the other configuration is omitted. The configuration is the same as in the second embodiment.

  In this filtration device, since a large number of fins 9 are arranged on the inner wall surface of the drum 1 (and / or filter 3), the release agent that is in contact with the inner wall surface of the drum 1 (and / or filter 3). Can be forcibly rotated together with the inner wall surface. For this reason, a strong circulation flow can be generated in the release agent, and the release agent can be more reliably stirred.

  Even if the fin 9 provided on the inner wall surface of the drum 1 (and / or the filter 3) is a plate-like fin parallel to the axis of the drum 1, the stirring effect is sufficiently exhibited. When the fins 9 are spirally twisted on the inner wall surface of the drum 1 (and / or the filter 3), the flow of the release agent in the drum 1 and the filter 3 is caused in the rotation direction of the drum 1. It can be generated not only in the axial direction of the drum 1 but also in the axial direction. For this reason, the fine particles made of the lubricant are uniformly dispersed in the release agent, and the occurrence of problems such as precipitation can be further suppressed.

  In the present embodiment, the following effects can be achieved.

  (A) A filter 3 for filtering impurities is disposed in the container 1, and a stock solution containing impurities is supplied to one chamber partitioned by the filter 3 via the inlet pipe 4, and the other chamber partitioned by the filter 3. In the filtration device that discharges the liquid obtained by filtering the impurities with the filter 3 through the outlet pipe 5, the flow means 7 for flowing the liquid in the container 1 is provided. In other words, since the liquid is filtered by the flow means 7 in the container 1 and filtered by the filter 3, precipitation of fine particles contained in the liquid into the container can be suppressed, and the filter 3 is not clogged unnecessarily. Can be used, and the problem of solidifying in the filtration container 1 can be solved. In this case, the flow means 7 can be obtained by rotating the container 1, that is, the drum 1, but when the drum 1 is not rotated, the stirring means is disposed in the container 1. Also good.

  (A) As in the first and second embodiments, the liquid in the container 1 is caused to flow by rotating the container 1 constituting the filtration device by the flow means 7, that is, the container 1 is formed in the cylindrical drum 1. And a bottomed cylindrical filter 3 arranged concentrically inside or arranged around the axis at equal intervals, the drum 1 and / or the filter 3 being rotated around the axis of the drum 1 Thus, the liquid in the drum 1 is caused to flow, so that impurities can be filtered using the entire surface of the filter 3.

  (C) As in the third embodiment, the liquid in the container 1 is caused to flow by rotating the container constituting the filtration device by the flow means 7, that is, the container 1 is formed into the cylindrical drum 1, and the drum One or a plurality of plate-like filters 8 that divide the inside of the drum 1 into an inlet side and an outlet side are provided, and the drum 1 and / or the filter 8 is rotated around the axis of the drum 1 to rotate the liquid in the drum 1. As a result, the impurities can be filtered using the entire surface of the filter 8.

  (D) By arranging a plurality of fins 9 on the inner wall surface of the drum 1 and / or the inner wall surface of the filter 3 as in the fourth embodiment, a stronger flow can be generated in the drum 1, More reliable stirring is possible, and precipitation of fine particles contained in the liquid can be effectively suppressed.

  (E) When the fins 9 are spirally arranged on the inner wall surface of the drum 1 and / or the inner wall surface of the filter 3, the flow of liquid in the drum 1 and the filter 3 occurs not only in the rotation direction of the drum 1 but also in the drum For example, fine particles made of a lubricant are uniformly dispersed in the liquid, and the occurrence of problems such as precipitation can be further suppressed.

  (F) When the operation of the container or drum 1 is continued even when the filtration action of the filtration device is interrupted, liquid stagnation does not occur even during the interruption of filtration, and the precipitation of fine particles is suppressed. can do.

  The filtration device of the present invention has dispersed graphite fine particles acting as a lubricant in a liquid to be filtered, such as an oxide scale having a relatively large particle size mixed in a release agent used in a forging device. Although it is a filtration device for separating impurities, the present invention is not limited to this, and impurities in the case where there are active ingredients having a relatively small particle diameter and impurities having a relatively large particle diameter mixed in the liquid. Widely available for separation and filtration.

The cross-sectional view of the filtration apparatus of the 1st Example which shows embodiment of this invention. The longitudinal cross-sectional view of the filtration apparatus similarly shown in FIG. The block diagram of the filtration system which applies a filtration apparatus. Sectional drawing of the filtration apparatus of 2nd Example. The schematic cross-sectional view (A) and schematic longitudinal cross-sectional view of the filtration apparatus of 3rd Example. The schematic cross-sectional view (A) and schematic longitudinal cross-sectional view of the filtration apparatus of 4th Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Container, drum 2 Bulkhead 3, 8 Filter 4 Inlet piping 5 Outlet piping 6 Rotation support device 7 Rotation drive device, flow means 9 Fin

Claims (6)

A filter for filtering impurities is placed in the container, and a stock solution containing impurities is supplied to one chamber partitioned by the filter via the inlet pipe, and the filter is connected to the other chamber partitioned by the filter via the outlet pipe. In the filtration device that discharges the liquid filtered impurities,
The container constituting the filtration device is formed by a cylindrical drum arranged in a state where the axis is inclined with respect to the horizontal direction or the horizontal direction,
The liquid level of the stock solution containing impurities and the filtered liquid is present in the drum,
By rotating the drum around its axis to cause the liquid in the drum to flow , and when the drum inner surface and the filter surface are located within the liquid surface and when located outside the liquid surface are alternately repeated, A filtration device characterized in that impurities adhering to the drum inner surface and the filter surface are peeled off and returned to the liquid to prevent the impurities from precipitating . The filter is formed in a bottomed cylindrical shape arranged concentrically inside the drum,
The filtration device according to claim 1, wherein a plurality of fins are arranged in the axial direction on the inner wall surface of the drum and / or the filter surface . The filtration device according to claim 2, wherein the fins are spirally disposed on the inner wall surface of the drum and / or the inner wall surface of the filter. The filtration device according to any one of claims 1 to 3, wherein the rotation of the drum is continued even when the filtration operation of the filtration device is interrupted . A filter for filtering impurities is placed in the container, and a stock solution containing impurities is supplied to one chamber partitioned by the filter via the inlet pipe, and the filter is connected to the other chamber partitioned by the filter via the outlet pipe. In the filtration method of discharging the liquid filtered impurities,
The container constituting the filtration device is formed by a cylindrical drum, and the axial center is arranged in a state inclined with respect to the horizontal direction or the horizontal direction,
The liquid level of the stock solution containing impurities and the filtered liquid is present in the drum,
By rotating the drum around its axis to cause the liquid in the drum to flow , and when the drum inner surface and the filter surface are located within the liquid surface and when located outside the liquid surface are alternately repeated, A filtration method characterized in that impurities adhering to an inner surface of a drum and a filter surface are peeled off and returned to the liquid to suppress precipitation of impurities . 6. The filtration method according to claim 5 , wherein the flow of the liquid in the container is continued even when the filtration is interrupted .

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