JP5395528B2 - Coolant filtration device - Google Patents

Description

  The present invention relates to a method and an apparatus for filtering dirty coolant (dirty liquid) containing chips generated in cutting work of ferrous and non-ferrous metals into a clean coolant (clean liquid) upon reuse. It is about.

  In the cutting work of ferrous metals and non-ferrous metals, coolant is used for cooling the cutting tool, cooling the cutting site, removing chips, flowing chips, lubrication, etc., and this coolant is reused. In the reuse, it is necessary to filter and remove sludge such as chips (hereinafter simply referred to as chips) contained in the dirty liquid, and various devices have been proposed for this purpose.

  Conventional coolant filtration devices can be broadly classified into a hinge belt conveyor system, a drum filter conveyor system, and a combination of both. Among these, the hinge belt conveyor system is such that a dirty liquid is poured onto a belt conveyor formed by connecting a large number of metal plates interconnected via hinges in a caterpillar shape, and gaps between the metal plates (metal plates). In some cases, a small hole is used), or the chips are collected by passing through a gap between the chain and the rail on both sides.

  In the case of this hinge belt conveyor system, it is effective for collecting curled or dango-like relatively large chips, but it passes through the gaps between the metal plates, the gaps between the chains and the rails on both sides, etc. Since such small chips cannot be collected, there is a disadvantage that it is not suitable for microfiltration.

  As a drum filter conveyor system, for example, the one described in Patent Document 1 (Japanese Patent Laid-Open No. 7-204427) is known. The scraper is disposed in the dirty liquid tank, and scrapes accumulated on the inner bottom of the dirty liquid tank are scraped off by the scraper and pushed from the bottom part to the upward extending part. The dirty liquid is precisely filtered through a drum filter installed inside the conveyor with a scraper and driven to rotate by the conveyor with a scraper, and the resulting clean liquid flows out from the inside of the drum filter. Is.

  Although this drum filter conveyor system is suitable for microfiltration, it is not suitable for collecting relatively large chips such as curls or dangos. That is, these chips are collected to some extent by a conveyor with a scraper, but the chips that have not been collected accumulate without being carried out into the drum filter conveyor, damage the filter, or a conveyor with a scraper or a drum filter. There is a risk that they may enter the gaps of these and hinder their rotation.

  As what used the hinge belt conveyor system and the drum filter conveyor system together, the thing of patent document 2 (US Pat. No. 5,167,839) is known, for example. In this system, protective measures are taken to protect the drum filter from the relatively large chips. However, since the drum filter is disposed in the dirty liquid tank, the protection is limited. In addition, since the primary filtration is not performed by the drum filter after the primary filtration by the hinge belt conveyor, the microfiltration by the drum filter cannot be expected.

  Further, as a combination of the hinge belt conveyor system and the drum filter system, there is one described in Patent Document 2 (Japanese Patent Laid-Open No. 9-300171), which is a hinge belt conveyor that communicates dirty liquid tanks with each other. The structure which divides | segments into the primary filtration tank by A and the secondary filtration tank by a drum filter is proposed.

  However, this configuration is simply a hinge belt conveyor type filtration device and a drum filter conveyor type filtration device as in Patent Document 1 connected side by side, which is large and requires a lot of space for installation. Is necessary, and there is a disadvantage that maintenance is not easy.

Japanese Patent Laid-Open No. 7-204427 US Pat. No. 5,167,839 Japanese Patent Laid-Open No. 9-300171

  The combination of the hinge belt conveyor type and the drum filter conveyor type has the advantages of the hinge belt conveyor type and the drum filter conveyor type, but should compensate for those disadvantages. The thing does not have such a structure, and a lot of space is required for installation due to its large scale, and there is a drawback that maintenance is not easy.

Therefore, the present invention combines the advantages of a hinge belt conveyor type that is suitable for collecting relatively large chips and the advantage of a drum filter conveyor type that enables fine filtration, and can be supplied at a relatively low cost with a simple and compact configuration. , without taking place in the installation, maintenance is easy, moreover, it is an object to provide a good coolant filtration KaSo location of filtration efficiency.

In order to solve the above-mentioned problems, the invention according to claim 1 is provided with a primary filtration tank provided with a conveyor means for primary filtration of coolant containing chips, and a drum filter is provided at a side of the primary filtration tank. A secondary filtration tank that communicates with the primary filtration tank so that coolant that has undergone primary filtration in the primary filtration tank can be introduced into the secondary filtration tank, and the secondary filtration is applied to the drum filter. The primary filter is provided with a means for collecting and discharging fine chips captured in the tank, and returning the fine chips collected and discharged by the fine chip collecting and discharging means to the primary filtration tank. A return path different from the communication path of the filtration tank and the secondary filtration tank is provided, and a spiral conveyor for returning the fine chips to the primary filtration tank is disposed in the return path.

In one embodiment of the present invention, the conveyor means is positioned below the liquid level at the rear end of the flat portion of the primary filtration tank, and is positioned above the liquid level at the front end of the flat portion. The hinge belt conveyor and other belt conveyors that are made to be fine, and the fine chips returned through the return path fall on the conveyor on the liquid level.

  In another aspect of the present invention, the drum filter is rotationally driven by a dedicated driving means, or is rotationally driven from the same driving means as the conveyor means of the primary filtration tank. The secondary filtration tank may be installed on both sides of the primary filtration tank.

Engaging Ru Coolant filtering device in the present invention, provided with a primary filtration tank for primary filtration of coolant by the conveyor means, by providing the secondary filtration tank equipped with a drum filter in communication with the primary filtration tank, the primary filtration tank The primary filtered coolant is introduced into the secondary filtration tank, and the fine chips captured in the secondary filtration tank are separated from the introduction path from the primary filtration tank to the secondary filtration tank by a spiral conveyor. all SANYO, characterized in that return to the filtration tank, according to the present invention, that combine relatively and advantages of the hinge belt conveyor type suitable for the recovery of large chips, the advantages of the drum filter system that allows microfiltration Therefore, it is possible to supply with relatively low price with a simple and compact configuration and easy maintenance. There is.

It is a schematic side view which shows the structural example of the coolant filtration apparatus which concerns on this invention. It is a schematic plan view which shows the structural example of the coolant filtration apparatus which concerns on this invention. FIG. 3 is an enlarged sectional view taken along line AA in FIG. 2. It is a top view which shows an example of the drive method of the drum filter and spiral conveyor in the coolant filtration apparatus which concerns on this invention. FIG. 5 is an enlarged sectional view taken along line BB in FIG. 4. It is another structure longitudinal cross-sectional view of the driving method of the drum filter and spiral conveyor in the coolant filtration apparatus which concerns on this invention. It is a schematic side view which shows the other structural example of the coolant filtration apparatus which concerns on this invention.

Below, the form for implementing this invention is demonstrated. The coolant filtration apparatus according to the present invention is provided with a primary filtration tank for primary filtration of the coolant by a conveyor means, and a secondary filtration tank provided with a drum filter communicating with the primary filtration tank. The primary filtered coolant is introduced into the secondary filtration tank, and the sludge trapped in the secondary filtration tank passes through a return path different from the communication path from the primary filtration tank to the secondary filtration tank, and then spiral conveyor. To return to the primary filtration tank .

The accompanying drawings, illustrates an embodiment of the coolant filtration KaSo location, the apparatus comprising a contaminated fluid with a conveyor means for primary filtration, the primary filtration tank 1 for storing and supplying contaminated fluid, A drum filter 4 is provided and is disposed on the side of the primary filtration tank 1, and is configured to include a secondary filtration tank 2 that is in communication with the primary filtration tank 1. The primary filtration tank 1 has an upper extension part 5 extending obliquely upward at one end thereof, and a conveyor means is disposed from the flat part 6 to the upper extension part 5 of the primary filtration tank 1.

As a conveyor means here, although a belt conveyor with a scraper etc. can also be employ | adopted, Preferably, the hinge belt conveyor 3 is employ | adopted. This hinge belt conveyor 3 is formed by connecting a large number of metal plates (may be provided with a large number of small holes) interconnected via hinges in a series of caterpillars. There is no particular difference from the conventional one. The hinge belt conveyor 3 is circulated and driven in the direction indicated by an arrow by a motor 7 installed on the upper part of the upwardly extending portion 5, and is arranged so that its upper half portion is on the liquid level.

  In the primary filtration tank 1, the dirty liquid travels through the primary filtration tank 1 from the dirty liquid inlet 8 provided on the end opposite to the installation side of the upper extension part 5. It is poured toward the side belt surface. As a result, the dirty liquid flows down from the gaps between the metal plates constituting the hinge belt conveyor 3, the gaps between the chains and the rails on both sides, and is mixed into the primary clean liquid in the primary filtration tank 1.

  On the other hand, the relatively large chips in the dirty liquid in the form of curls or dumplings are scraped off and collected by the hinge belt conveyor 3 (primary filtration). After that, while being on the belt surface, along with the circulation operation of the hinge belt conveyor 3, it is conveyed to the discharge port 9 formed to open downward at the upper end portion of the upper extending portion 5, and is discharged by its own weight. It falls from 9 and is collected.

  The upper half of the hinge belt conveyor 3 is inclined at the flat portion 6 of the primary filtration tank 1, and is located below the liquid level at the rear end side of the flat portion 6, that is, at the dirty liquid inlet 8 side. In some cases, the front end side, that is, the upwardly extending portion 5 side, is positioned on the liquid surface (see FIG. 7). In this case, the dirty liquid inlet 8 is usually arranged on a portion where the hinge belt conveyor 3 is located on the liquid surface. In the case of this embodiment, it is also possible to collect floating chips.

  The primary clean liquid obtained by primary filtration in the primary filtration tank 1 is stored in a primary clean liquid tank 10 installed in communication with the primary filtration tank 1, and a part thereof is the primary filtration tank 1 and the secondary filtration tank. 2 flows into the secondary filtration tank 2 from the communication port 12 formed in the partition wall 11 that partitions the wall 2. The communication port 12 has a semicircular shape as shown in FIG. 3, for example.

  A drum filter 4 is rotatably mounted in the secondary filtration tank 2. That is, the drum filter 4 is arranged so that the rotating shaft 4a thereof is parallel to the rotating shaft of the hinge belt conveyor 3, for example, the end of the primary filtration tank 1 side is pivotally supported by the partition wall 11, and The opposite end is pivotally supported by the partition wall 14 between the secondary clean tank 2 connected to the secondary filtration tank 2 and rotates in the same direction as the rotation direction of the hinge belt conveyor 3. (See FIG. 3).

  The drum filter 4 is provided with scrapers 15 at appropriate intervals on the peripheral side surface thereof, and the inner bottom surface 16 of the secondary filtration tank 2 is formed in a semicircular shape along the rotation locus of the scraper 15 of the drum filter 4 (particularly, (See FIG. 5). A return groove 17 is formed on the upper surface of the secondary filtration tank 2 on the side where the scraper 15 rises from below, extending in the direction of the rotating shaft 4a of the drum filter 4 and reaching the primary filtration tank 1 to function as a return path. Is done.

  The return groove 17 is used to return the fine chips 50 scraped up by the scraper 15 to the primary filtration tank 1 and is generally assumed to have a semicircular cross section, but is not limited thereto. . The return groove 17 may be formed to be inclined downward toward the primary filtration tank 1 in order to promote the return of the fine chips 50. Preferably, a forced return means is provided in the return groove 17 in order to return the fine chips 50 smoothly to the primary filtration tank 1 without leakage.

  As this forcible return means, for example, a spiral conveyor 18 (including those generally called a screw conveyor or a spiral conveyor) having blades extending spirally on an axis can be used. The spiral conveyor 18 forcibly feeds the fine chips 50 in the return groove 17 toward the primary filtration tank 1 by rotating the blades spirally.

  In the example shown in FIGS. 2 and 4, the drive source of the spiral conveyor 18 and the drive source of the drum filter 4 are common. That is, as shown in FIG. 4, the drive shaft of the drive motor 19 installed on the outer wall of the secondary clean tank 13 is directly connected to the rotary shaft 20 of the spiral conveyor 18, and the drive gear 21 is in the middle of the rotary shaft 20. It is fixed. An annular driven gear 22 that meshes with the drive gear 21 is installed at the edge of the drum filter 4. Thus, when the drive motor 19 is operated, the spiral conveyor 18 is directly driven to rotate, and the drum filter 4 is driven to rotate via the drive gear 21 and the driven gear 22.

  Conversely, the driven gear 22 of the drum filter 4 is used as a driving gear, the driving gear 21 of the spiral conveyor 18 is used as a driven gear, and the rotation of the drum filter 4 is transmitted to the spiral conveyor 18 to drive the spiral conveyor 18. Good.

  In the example shown in FIG. 6, the drive source of the drum filter 4 and the spiral conveyor 18 is obtained from the hinge belt conveyor 3. That is, a rotating shaft 41 is supported between the side plate 40 of the primary filtration tank 1 inside the hinge belt conveyor 3 and the partition wall 11, and the sprocket 42 meshes with the rotating shaft 41 on the drive chain 3 a of the hinge belt conveyor 3. Is fixed. And the end part by the side of the secondary filtration tank 2 is extended in the secondary filtration tank 2 to the one end part or both ends of the rotating shaft 41, and it fixes to the end surface obstruction | occlusion board 43 of the drum filter 4. FIG. A shaft cylinder 45 partially protruding from the outer side surface plate 44 of the secondary filtration tank 2 is fixed to the opening end surface on the opposite side of the drum filter 4, and a sprocket 46 is attached to the shaft cylinder 45. The shaft tube 45 is pivotally supported by the side plate 44 in a watertight state.

  On the other hand, the drive shaft 18 a of the spiral conveyor 18 protrudes from the outer side surface plate 44 of the secondary filtration tank 2, and a sprocket 47 is fixed to the tip thereof, and a chain 48 is wound around the sprocket 46 and the sprocket 47. Thus, the movement of the hinge belt conveyor 3 is transmitted to the drum filter 4 via the drive chain 3a, the sprocket 42 and the rotary shaft 41, and the drum filter 4 is driven to rotate. Further, the rotational driving force is transferred from the drum filter 4 to the shaft. The spiral conveyor 18 is rotated by being transmitted to the drive shaft 18a through the cylinder 45, the sprocket 46, the chain 48, and the sprocket 47.

  In the figure, 30 is a nozzle for backwashing, 31 is a pipe for supplying backwashing water to the nozzle 30 for backwashing, 32 is an oil skimmer, and 33 and 34 are pumps. The nozzle 30 for backwashing serves to backwash the drum filter 4 and to play away the chips 50 that are collected and ride on the scraper 15 toward the return groove 17.

  In the above configuration, when the dirty liquid is supplied from the dirty liquid inlet 8, the dirty liquid is primarily filtered in the hinge belt conveyor 3, and relatively large chips are left on the hinge belt conveyor 3, and in this state, the dirty liquid extends upward. It is conveyed to the discharge port 9 through the installation portion 5, where it falls into a collection box or the like by its own weight as the hinge belt conveyor 3 is turned back, and is appropriately collected.

  On the other hand, the primary clean liquid that has been primary filtered by flowing down from the gap of the hinge belt conveyor 3 or the gap between the chains and rails on both sides is stored in the primary filtration tank 1 or the primary clean liquid tank 10 and introduced in a timely manner. It flows into the secondary filtration tank 2 from the mouth 12 and wraps around the outer periphery of the drum filter 4. Then, the secondary clean liquid that has been subjected to microfiltration (secondary filtration) by passing through the filter on the circumferential surface of the drum filter 4 flows out from the inside of the drum filter 4 to the secondary clean liquid tank 13, from which it is re-applied. Provided for use.

  The fine chips 50 captured by the drum filter 4 in the secondary filtration tank 2 adhere to the filter or fall and accumulate on the inner bottom surface 16 of the secondary filtration tank 2. 50, the drum filter 4 continues to rotate in synchronization with or without synchronization with the hinge belt conveyor 3, and the scraper 15 rotates along the inner bottom surface 16 to be scraped off sequentially.

  The finely cut chips 50 scraped off are pushed up along the inner surface of the secondary filtration tank 2 on the scraper 15, reach the height of the return groove 17, and by the action of the backwash nozzle 30, the return groove Fall to 17. The fine chips 50 that have fallen into the return groove 17 are quickly and reliably dropped onto the hinge belt conveyor 3 on the liquid level of the primary filtration tank 1 by the action of the forced return means, and are subjected to primary filtration again. .

  In the illustrated example, when the drive motor 19 is operated or the spiral conveyor 18 is driven by the movement of the hinge belt conveyor 3, the fine chips 50 that have fallen into the return groove 17 become spiral. It is pushed by the rotating blades and dropped onto the upper surface of the hinge belt conveyor 3.

  As described above, according to the method and apparatus of the present invention, relatively large chips are collected in the primary filtration tank 1 by the conveyor means such as the hinge belt conveyor 3 (primary filtration), and then primary filtered. The primary clean liquid thus formed is secondarily filtered by the drum filter 4 in the secondary filtration tank 2 to remove the fine chips 50 to obtain a secondary clean liquid, which is used for reuse. At this time, the fine chips 50 recovered by the secondary filtration are returned to the primary filtration tank 1 without being mixed with the primary clean liquid as well as the secondary clean liquid, so that the filtration efficiency is very good.

  The above description is only for the preferred embodiments of the present invention, and it goes without saying that other different embodiments can be constructed without departing from the spirit and scope of the present invention. It is not limited to that particular embodiment, except as limited in the appended claims.

DESCRIPTION OF SYMBOLS 1 Primary filtration tank 2 Secondary filtration tank 3 Hinge belt conveyor 4 Drum filter 5 Upper extension part 6 Flat part 7 Motor 8 Dirty liquid introduction port 9 Discharge port 10 Primary clean tank 11 Partition wall 12 Communication port 13 Secondary clean liquid tank 14 Partition Wall 15 Scraper 16 Inner Bottom Surface of Secondary Filtration Tank 17 Return Groove 18 Spiral Conveyor 19 Drive Motor 20 Rotating Shaft 21 Drive Gear 22 Driven Gear

Claims (5)

  A primary filtration tank provided with a conveyor means for primary filtration of coolant containing chips is provided, and a secondary filtration tank that is provided with a drum filter and communicates with the primary filtration tank is disposed on the side of the primary filtration tank. The coolant that has been primarily filtered in the primary filtration tank can be introduced into the secondary filtration tank, and the drum filter is provided with a means for collecting and discharging fine chips captured in the secondary filtration tank. A return path different from the communication path of the primary filtration tank and the secondary filtration tank for returning the fine chips collected and discharged by the fine chip collection and discharge means to the primary filtration tank. And a spiral conveyor for returning the fine chips to the primary filtration tank in the return path. The conveyor means is located below the liquid level at the rear end portion of the flat portion of the primary filtration tank, and is located on the liquid surface at the front end portion of the flat portion. The coolant filtering device according to claim 1 , wherein the fine chips, which are conveyors and are returned through the return path, fall on the conveyor on the liquid level . The coolant filtering device according to claim 1 , wherein the drum filter is rotationally driven by a dedicated driving unit. The coolant filter device according to claim 1 , wherein the drum filter is driven to rotate by being derived from the same drive means as the conveyor means of the primary filtration tank. The secondary filtration tank is installed on both sides of the primary filtration tank, coolant filtration apparatus according to claim 1.

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