JP2021194750A - Filter device - Google Patents

Abstract

To provide a filter device that can drastically reduce an installation space without making filtering ability inferior compared with that of conventional large equipment.SOLUTION: A cylindrical filter tank 5 partitioned and formed into an inner tank 3 and an outer tank 4 sharing a center in a cylindrical filter 2 is provided. An upper-end opening 3a opened in the inner tank 3 of the filter tank 5 is rotatably connected to a cleaning tank CCT of a coolant tank. A sludge pot 30 for storing chips is connected to the center of the lower end of the outer tank 4 provided below the closed and rotatably supported lower end of the inner tank 3. A sludge tank DCT of a coolant tank is connected to an upper-end side of the filter tank 5 via a coolant pump 33 for pumping a used cutting liquid into the outer tank 4. An arcuate downward flow passage 13 continuous with a pressure inlet 20 for a used cutting fluid, provided on a side of an upper end 9, is formed at an upper end in the outer tank 4. A plurality of blades 6a are radially projected on an upper part of an outer peripheral surface of the filter 2 below the downward flow passage 13 in the outer tank 4.SELECTED DRAWING: Figure 10

Description

The present invention relates to a filtration device installed in a coolant tank of a machine tool such as a lathe or a machining center.

Conventionally, in this type of machine tool, the cutting fluid used when machining the workpiece is poured into the chip conveyor together with the chips, and the chip conveyor is placed below the machine tool in order to reduce the occupied area in the factory. It flows into the pollutant tank in the coolant tank in which the part is arranged.

A wire mesh-like rotary drum is laid down in the pollutant tank, and a filtration device configured to separate the cutting fluid from the chips by flowing the cutting fluid from the outside to the inside of the drum is installed.

The cutting fluid separated from the chips by the filtration device is separated from the pollutant tank in the coolant tank and discharged to a clean tank formed so as to communicate with the inside of the drum, and is discharged from the clean tank by the cutting fluid supply device. It is reused as a cutting fluid for machine tools (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2005-22007

In the above filtration device, the drum is replaced when the desired filtration function cannot be achieved due to deterioration due to the expiration of the service life, etc. In this case, the coolant tank is located below the machine tool or the drum itself is There are problems that the work is extremely troublesome and time-consuming, such as being relatively large and having many parts that need to be disassembled to replace the drum.

Therefore, in the present invention, there is a filtration device capable of dramatically reducing the installation space without inferior in filtration capacity as compared with large equipment such as a chip conveyor used for chip processing and a drum for filtering cutting fluid. The purpose is to provide.

In view of the above problems, the filtration device according to the present invention is provided with a cylindrical filtration tank partitioned between an inner tank and an outer tank having a center shared by a cylindrical filter, and an upper end opening opened in the inner tank of the filtration tank. The part is rotatably connected to the clean tank of the coolant tank, and a sludge pot for storing chips is connected to the center of the lower end of the outer tank provided below the lower end of the inner tank that is closed and rotatably supported. The sludge tank of the coolant tank is connected to the upper end side of the filtration tank via a coolant pump that press-fits the used cutting liquid into the tank, and an arc shape continuous with the pressure inlet of the used cutting liquid provided at the upper end side. The down flow path is formed at the upper end of the outer tank, and a plurality of blades are radiated and projected above the outer peripheral surface of the filter below the down flow path in the outer tank.
Further, a terminal opening communicating with the clean tank is provided on the central axis of the filtration tank, and a disk interposed between the end faces of the terminal openings and the upper end openings of the inner tank is provided. Insert each insertion port of a tubular pipe joint made of a self-lubricating material with a shape retaining flange protruding outward, and insert the end face of the lower end opening opened in the inner tank and the filtration tank on which this can be placed. A sliding bearing bush made of a self-lubricating material having a disc-shaped flange interposed between the seat plates provided inside is fitted onto the convex portion protruding from the center of the seat plate. , It is characterized by being inserted into the lower end opening of the inner tank.
Further, it is characterized in that an impeller having a plurality of blades radiatingly projected on a cylindrical body is fitted onto the upper part of the filter.

In short, since the present invention has the above configuration, the used cutting fluid in the sludge tank that has been press-fitted into the outer tank of the filtration tank through the press-in port by the operation of the coolant pump first passes through the arc-shaped downward flow path. , It becomes a spiral downward flow and flows down while swirling, and is guided by the blades on the upper part of the filter below the downward flow path, so that the filter itself can be rotated.
Then, the used cutting fluid in the entire outer tank becomes a series of spiral descending flows and flows downward along the inner peripheral surface of the outer tank, and the filter rotates by the blades together with the spiral descending flow, so that the filter is around the filter. Most of the chips in the used cutting fluid are separated by the centrifugal force generated by the rotation of the filter, spirally guided downward in the outer tank, settled in the lower part of the outer tank, and stored in the sludge pot. ..
Further, the used cutting fluid press-fitted into the filter is filtered by passing through the filter, flows into the inner tank as the filtered cutting fluid, and flows to the clean tank through the upper end opening thereof.
Due to the centrifugal force generated by the rotation of the filter, even fine chips are difficult to approach the filter and are caught in the spiral downward flow and discharged into the sludge pot, so the chips do not easily adhere to the outer peripheral surface of the filter. , It is possible to prevent clogging of the outer peripheral surface of the filter.
Therefore, according to the present invention, since the filtration tank and the coolant pump are only connected by piping between the sludge tank and the clean tank of the coolant tank, the installation space can be dramatically reduced as compared with the conventional large-scale equipment.
In addition, the filter that rotates in the outer tank can centrifuge the chips around the filter and guide them to the spiral downward flow, and the used cutting fluid that has flowed down a large amount of chips in this way is filtered by the filter. The filtration capacity is not inferior to that of the conventional product that filters with a rotary drum, and chips are less likely to adhere to the outer peripheral surface of the filter, so the life of the filter can be extended and the running cost of the filter can be significantly reduced. ..

Further, a terminal opening communicating with the clean tank is provided on the central axis of the filtration tank, and a disk interposed between the end faces of the terminal openings and the upper end openings of the inner tank is provided. Insert each insertion port of a tubular pipe joint made of a self-lubricating material with a shaped retaining flange protruding outward, and insert the end face of the lower end opening opened in the inner tank and the filtration tank on which this can be placed. A sliding bearing bush made of a self-lubricating material having a disc-shaped flange interposed between the seat plates provided inside is fitted onto the convex portion protruding from the center of the seat plate. Since it is inserted into the lower end opening of the inner tank, it can be bearing so that the upper and lower parts of the filter can rotate smoothly without rattling due to the material characteristics of the pipe joint and the sliding bearing bush. A normal centrifugal force can be applied to prevent chips from adhering to the surface, and a filter that is rotatably supported in this way can be easily connected to the cleaning tank with a pipe joint, and the cutting liquid filtered by the filter can be easily connected to the cleaning tank. It is made to flow to.

Further, since an impeller having a plurality of blades radiated into a cylindrical body is fitted on the upper part of the filter, the practical effect is great, such as the ability to easily radiate a plurality of blades into the filter.

It is a schematic diagram which shows one use example of a filtration apparatus. It is a front view of a filtration tank. It is a side view of a filtration tank. It is an exploded perspective view of a filtration tank. It is a vertical sectional view of a filtration tank. FIG. 5 is a sectional view taken along the line AA of FIG. FIG. 5 is a cross-sectional view taken along the line BB of FIG. FIG. 5 is a sectional view taken along the line CC of FIG. FIG. 5 is a cross-sectional view taken along the line DD of FIG. It is a figure which shows the flow of the cutting fluid at the time of filtration.

Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, in the coolant tank CT equipped in the machine tool, the filtration device 1 according to the present invention is a pipe between the sludge tank DCT and the clean tank CCT in which the inside of the coolant tank CT is partitioned by a partition plate. The filtered cutting fluid CC obtained by connecting and press-filtering the used cutting fluid DC in the sludge tank DCT and separating it from the chips is discharged to the clean tank CCT.

The filtration device 1 is provided with a cylindrical filtration tank 5 which is partitioned between an inner tank 3 and an outer tank 4 which share a center with a cylindrical filter 2.
In FIGS. 1 to 3, in order to clearly show the inside of the filtration tank 5, the outer line indicating the filtration tank 5 (outer tank 4) is shown by a virtual line (dashed-dotted line).

The filter 2 has a cylindrical and predetermined filtering function, such as a lightweight porous ceramic formed into a cylindrical shape having a predetermined wall thickness, or a laminated wire mesh formed into a cylindrical shape to form a porous structure, which will be described later. There is no limitation as long as it is lightweight and rigid enough to rotate.

Further, a plurality of blades 6a (six in the illustrated example) are radially projected on the upper part of the outer peripheral surface of the filter 2.

Specifically, a synthetic resin impeller 6 having square plate-shaped blades 6a projecting along a bus having the flat cylindrical body 6b at equal intervals in the circumferential direction is fitted onto the upper part of the filter 2. By fixing the cylindrical body 6b with screws 7 from three directions, a plurality of blades 6a are easily and easily integrated into the filter 2.

In the filtration tank 5, the upper lid 9 and the lower lid 10 are watertightly joined to each of the upper and lower openings of the body 8 made of a cylindrical transparent plastic having a predetermined volume with a ring packing 11.

The upper lid 9 which is the upper end of the filtration tank 5 has a right-angled flow path 12 which communicates with the inner tank 3 and the external clean tank CCT, and an arc (excellent arc in the illustrated example) which communicates with the outer tank 4 and the external sludge tank DCT. Downstream flow path 13 is provided (see FIGS. 6 to 8).

The right-angled flow path 12 is provided in the discharge port 14 of the filtered cutting fluid CC opened on one side of the upper lid 9 (the left side in FIGS. 2 and 5) and the cleaning tank CCT provided on the central axis of the bottom of the upper lid 9. It is formed by communicating with the terminal opening 15 that communicates at a right angle, and a circular end surface 16 having a diameter slightly larger than the outer diameter of the filter 2 is recessed in the center of the bottom of the upper lid 9.

Further, a through hole 17 communicating with the right-angled flow path 12 is provided at the central portion of the upper part of the upper lid 9.

Then, a disc-shaped retaining flange 18a interposed between the end faces 16 and 2a of each of these openings is projected outward from each of the terminal opening 15 and the upper end opening 3a of the inner tank 3. By inserting each insertion port 18b of the tubular pipe joint 18 made of a lubricating material (for example, polyacetal), the material characteristics of the pipe joint 18 can be compared with the terminal opening 15 of the inner tank 3 (filter 2). The upper opening end 3a is rotatably connected.

On the other hand, on the other side of the upper lid 9 (the right side in FIGS. 2 and 5), the pressure inlet of the used cutting fluid DC that is on the same straight line as the discharge port 14 and is blocked from the discharge port 14 by the partition wall 19. 20 is provided.

The down flow path 13 starts at the communication hole 20a with the pressure inlet 20 provided near the partition wall 19 at the back of the pressure inlet 20, and rotates clockwise (counterclockwise in FIG. 6) around the end surface 16 of the terminal opening at the bottom of the upper lid 9. A series of superior arc-shaped grooves recessed in the outer tank 4 that are continuous with the pressure inlet 20 at the upper end of the outer tank 4 by gradually inclining the upper portion of the bottom of the groove downward from the start end to the end end. It constitutes the descending flow path of.

The lower lid 10 is formed in a dish shape, and a discharge port 21 having a screw hole is provided at the center thereof, and a filter 2 is placed above the discharge port 21 to close the lower end of the inner tank 3 inside the filter 2. At the same time, a disk-shaped seat plate 22 that rotatably supports the filter 2 is arranged.

The seat plate 22 is formed to have the same diameter as the outer diameter of the filter 2, and is supported by the leg portions 23 projecting upward from four sides of the inner peripheral edge of the lower lid 10 toward the center.

On the central axis of the seat plate 22, a cylindrical convex portion 22a having a diameter slightly smaller than that of the lower end opening 3b opened in the inner tank 3 (filter 2) is projected upward.

Then, a slide bearing bush 24 made of a self-lubricating material (for example, polyacetal) having a disc-shaped flange portion 24a protruding outward from the entire surface of the end surface 2b of the lower end opening 3b is inserted into the lower end opening 3b. By doing so, the lower end of the filter 2 is rotatably supported on the seat plate 22 around the convex portion 22a due to the material characteristics of the slide bearing bush 24.

On the other hand, the shaft rod 25 is erected vertically upward by screwing the base end of the shaft rod 25 to the upper end of the convex portion 22a. It protrudes through the through hole 17.

Then, by fastening the male screw portion 25a on the upper lid 9 with the lock nut 26, the filtration tank 5 in which the body portion 8 is sandwiched and integrated between the upper lid 9 and the lower lid 10 is configured, and the end face of the terminal opening of the upper lid 9 is formed. A filter 2 rotatably connected to the terminal opening 15 is arranged between 16 and the seat plate 22 of the lower lid 10.

As a result, in the filtration tank 5, the inside of the body 8 is divided into the inner and outer tanks 3 and 4 by the filter 2, the inner tank 3 and the right-angled flow path 12 are communicated with each other, and the outer tank 4 and the downstream flow path 13 are communicated with each other. An impeller 6 fitted to the filter 2 is arranged below the down flow path 13 in the outer tank 4.

The upper lid 9 watertightly closes the through hole 17 by the ring packing 27 interposed between the upper lid 9 and the lock nut 26.

Further, in the filtration tank 5, the measuring unit of the pressure gauge 29 is screwed into the screw hole 28 opened so as to communicate with the inside of the pressure inlet 20 from the upper right side of the upper lid 9 in a watertight manner, and the pressure gauge 29 is inserted into the outer tank 4 It is designed to check the pressure inside the outer tank 4 by connecting to.

Further, the discharge port 21 at the center of the lower end (lower lid 10) of the outer tank 4 below the closed lower end (seat plate 22) of the inner tank 3 is cut separated from the used cutting fluid DC by the filtration device 1. A sludge pot 30 for storing waste is detachably connected via a ball valve 31.

The sludge pot 30 has a transparent plastic body portion 30a in which the amount of chips stored can be visually recognized, and when a predetermined amount of chips is stored, the ball valve 31 is closed and the sludge pot 30 is separated from the ball valve 31. However, I try to take out the chips in it.

Further, the inner tank 3 is connected to the clean tank CCT via a pipe 32 connected to the discharge port 14 communicating with the upper end opening 3a opened therein.

A coolant pump 33 for press-fitting the used cutting fluid DC into the outer tank 4 is connected to the press-in port 20 via a pipe 34, and the suction side of the coolant pump 33 is connected to the sludge tank DCT. ..

In the filtration device 1 having the above configuration, the used cutting fluid DC in the sludge tank DCT that has been press-fitted into the outer tank 4 through the press-in port 20 by the operation of the coolant pump 33 first passes through the arc-shaped downstream flow path 13. By doing so, it becomes a spiral descending flow and flows down while swirling, and is guided by the blade 6 on the upper part of the filter 2 below the downstream flow path 13 to rotate (rotate) the filter 2 itself.

Due to the material characteristics of the pipe joint 18 and the sliding bearing bush 24, the filter 2 is bearing so that it can rotate smoothly up and down without rattling, and is normally centrifugal to the used cutting fluid DC around the filter 2 in the outer tank 4. In addition to being able to apply force, even if it is rotatable in this way, it can be connected to the clean tank CCT through the pipe joint 18.

Then, the used cutting fluid DC in the entire outer tank 4 becomes a series of spiral descending flows and flows downward along the inner peripheral surface of the outer tank 4, and the filter 2 is rotated by the blade 6 together with the spiral descending flow. Therefore, most of the chips in the used cutting fluid DC around the filter 2 are separated by the centrifugal force generated by the rotation of the filter 2, and are spirally guided downward in the outer tank 4 to lower the outer tank 4. It is settled in the sludge pot 30 and stored in the sludge pot 30 from the discharge port 27.

Further, the used cutting fluid DC press-fitted into the filter 2 is filtered by passing through the filter 2, flows into the inner tank 3 as the filtered cutting fluid CC, and is communicated with the upper end opening 3a of the discharge port 14. Flows from the pipe 32 to the clean tank CCT.

Due to the centrifugal force generated by the rotation of the filter 2, even fine chips are difficult to approach the filter 2 and are caught in the spiral descending flow and discharged into the sludge pot 30. Therefore, the chips are discharged onto the outer peripheral surface of the filter 2. It is difficult to adhere and clogging of the outer peripheral surface of the filter 2 can be prevented.

If the filtration function of the filter 2 deteriorates during the above filtration, the amount of used cutting fluid DC permeating into the filter 2 decreases, and the pressure in the outer tank 4 rises above the normal value. Therefore, this pressure rise is a pressure gauge. If confirmed in 29, replace the filter 2.

2 filters
2a Top opening end face
2b Lower end opening end face 3 Inner tank
3a Top opening
3b Lower end opening 4 Outer tank 5 Filtration tank 6 Impeller
6a feathers
6b Cylindrical body 9 Top
13 Downstream
15 Terminal opening
16 Terminal opening end face
18 pipe fittings
18a retaining flange
18b outlet
20 Pressure inlet
22 Seat plate
22a convex part
24 Plain bearing bush
24a tsuba
30 sludge pot
33 Coolant pump
CT coolant tank
DC used cutting fluid
CCT clean tank
DCT sludge tank

Claims (3)

A cylindrical filtration tank divided into an inner tank and an outer tank that share the center with a cylindrical filter is provided, and the upper end opening opened in the inner tank of the filtration tank is rotatably connected to the clean tank of the coolant tank. , Connect a sludge pot that stores chips to the center of the lower end of the outer tank provided below the lower end that is rotatably supported and the inner tank is closed, and a coolant pump that press-fits the used cutting liquid into the outer tank. The sludge tank of the coolant tank is connected to the upper end side of the filtration tank, and an arcuate downward flow path continuous with the pressure inlet of the used cutting liquid provided at the upper end side is formed at the upper end of the outer tank. , A filtration device characterized in that a plurality of blades are radiated and projected on the upper part of the outer peripheral surface of the filter below the down flow path in the outer tank. A terminal opening communicating with the clean tank is provided on the central axis of the filtration tank, and each of the terminal opening and the upper end opening of the inner tank has a disk shape interposed between the end faces of the respective openings. Insert each insertion port of a tubular pipe joint made of a self-lubricating material with a retaining flange protruding outward, and insert the end face of the lower end opening opened in the inner tank and inside the filtration tank so that it can be placed. A slip bearing bush made of a self-lubricating material having a disc-shaped flange interposed between the provided seat plates is fitted externally to the convex portion projecting from the center of the seat plate and inside. The filtration device according to claim 1, wherein the filtration device is inserted into the lower end opening of the tank. The filtration device according to claim 1 or 2, wherein an impeller having a plurality of blades radiatingly projected onto a cylindrical body is fitted onto the upper part of the filter.

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