JP7177518B2 - filtration device - Google Patents

Description

The present invention relates to a filtering device installed in a coolant tank of machine tools such as lathes and machining centers.

Conventionally, in this type of machine tool, the cutting fluid used during machining of the workpiece is flowed into the chip conveyor along with the chips, and on the chip conveyor, the machine tool is placed in a single area below the machine tool in order to reduce the area occupied in the factory. It flows into the pollution tank in the coolant tank where the part is arranged.

A wire net-like rotating drum is placed sideways in the contamination tank, and a filtration device is installed so that the cutting fluid flows from the outside to the inside of the drum to separate it from chips.

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

Japanese Unexamined Patent Application Publication No. 2005-22007

In the above filtering device, the drum is replaced when the desired filtering function cannot be achieved due to deterioration due to the lapse of service life, etc. In this case, the coolant tank is arranged below the machine tool, and the drum itself is It is relatively large, and there are many parts that need to be disassembled to replace the drum.

Therefore, in the present invention, a filtering device is provided that is not inferior in filtering capacity to large facilities such as chip conveyors used for chip disposal and drums for filtering cutting fluid, and that can dramatically reduce the installation space. intended to provide.

In view of the above problems, a filtration device according to the present invention is a filtration device that is pipe-connected between a sludge tank and a clean tank of a coolant tank. A partitioned columnar filtration tank is provided, and at the upper end of the filtration tank, a discharge port for the filtered cutting fluid that connects the piping on the clean tank side and a terminal opening provided on the central axis of the bottom for communication. and an injection port for used cutting fluid that connects the piping on the sludge tank side, the upper end of the filter is rotatably connected to the upper end of the filtration tank, and the upper end opening opened in the inner tank and the filtration tank. A sludge pot for storing chips is connected to the center of the lower end of the outer tank provided below the closed and rotatably supported lower end of the inner tank by communicating with the terminal opening, and used cutting fluid in the sludge tank. A coolant pump that presses into the outer tank is connected to the piping on the sludge tank side, and an arc-shaped downstream flow path that continues to the injection port is formed at the upper end of the outer tank. The filter is characterized in that a plurality of blades are radially projected from the upper portion of the outer peripheral surface of the filter.
In addition, in each of the end opening and the upper end opening of the inner tank, a disc-shaped retainer flange interposed between the end faces of these openings is projected outward from a cylinder made of a self-lubricating material. A disk-shaped flange that is inserted between the end face of the lower end opening opened in the inner tank and the seat plate provided in the filtration tank so that it can be placed. is fitted on the projection projecting from the center of the seat plate and fitted into the lower end opening of the inner tank.
Further, it is characterized in that an impeller having a plurality of blades radially projecting from a cylindrical body is fitted on the top of the filter.

In short, according to the present invention, since the coolant pump is operated, the used cutting fluid in the sludge tank, which is pressurized into the outer tank of the filtration tank through the injection port, first passes through the arc-shaped downstream flow path. , and flows down as a spiral descending flow while swirling, and is guided by the blades on the top of the filter below the downstream flow path, so that the filter itself can be rotated.
The used cutting fluid in the entire outer tank flows downward along the inner peripheral surface of the outer tank as a series of spiral downward flows. 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 at the bottom of the outer tank and stored in the sludge pot. .
Also, the used cutting fluid pressurized into the filter is filtered by passing through the filter, flows into the inner tank as filtered cutting fluid, and flows to the cleaning tank through the upper end opening thereof.
Due to the centrifugal force generated by the rotation of the filter, even fine chips do not easily approach the filter and are caught in the spiral downward flow and discharged into the sludge pot. , clogging of the outer peripheral surface of the filter can be prevented.
Therefore, according to the present invention, since the filter tank and the coolant pump are simply 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 equipment.
In addition, the filter that rotates in the outer tank can centrifugally separate the chips around the filter and guide them into a spiral downward flow. Filtration capacity is not inferior to that of conventional products that filter with a rotating drum, and since chips are less likely to adhere to the outer peripheral surface of the filter, the service life of the filter can be extended and the running cost of the filter can be greatly reduced. .

In addition, in each of the end opening and the upper end opening of the inner tank, a disc-shaped retainer flange interposed between the end faces of these openings is projected outward from a cylinder made of a self-lubricating material. A disk-shaped flange that is inserted between the end face of the lower end opening opened in the inner tank and the seat plate provided in the filtration tank so that it can be placed. The sliding bearing bush made of a self-lubricating material protruding outward is fitted on the projection projecting from the center of the seat plate and is also inserted into the lower end opening of the inner tank, so that the pipe joint and the sliding bearing Due to the material characteristics of the bushing, the upper and lower parts of the filter can be supported so that they can rotate smoothly without rattling. The filter rotatably supported in this way can be easily connected to the cleaning tank by a pipe joint, and the cutting fluid filtered by the filter can flow into the cleaning tank.

Furthermore, since the impeller having a plurality of blades radially projecting from the cylindrical body is fitted on the upper part of the filter, the practical effect is extremely great, such as the fact that a plurality of blades can be easily arranged radially projecting from the filter.

It is a schematic diagram showing an example of use of a filtering device. 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 longitudinal cross-sectional view of a filtration tank. FIG. 6 is a cross-sectional view taken along the line AA of FIG. 5; FIG. 6 is a cross-sectional view taken along the line BB of FIG. 5; 6 is a cross-sectional view taken along line CC of FIG. 5; FIG. FIG. 6 is a cross-sectional view taken along line DD of FIG. 5; FIG. 5 is a diagram showing the flow of cutting fluid during filtration;

An embodiment of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the filtration device 1 according to the present invention is a coolant tank CT installed in a machine tool. Then, the used cutting fluid DC in the sludge tank DCT is press-fitted and filtered to separate the chips from the filtered cutting fluid CC, which is discharged to the cleaning tank CCT.

This filtration device 1 is provided with a cylindrical filtration tank 5 which is partitioned into 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 outline of the filtration tank 5 (outer tank 4) is indicated by an imaginary line (chain double-dashed line).

The filter 2 has a cylindrical shape with a predetermined filtering function, such as a cylindrical porous ceramic having a predetermined wall thickness, or a porous structure formed by forming a laminated wire mesh into a cylindrical shape. As long as it is lightweight and rigid enough to rotate on its axis, it is not limited at all.

In addition, a plurality of (six in the illustrated example) blades 6a radially project from the upper portion of the outer peripheral surface of the filter 2 .

Specifically, a synthetic resin impeller 6 having rectangular plate-shaped blades 6a protruding along the generatrix of a flat cylindrical body 6b at regular intervals in the circumferential direction is fitted to the upper part of the filter 2. A plurality of blades 6a are easily integrated with the filter 2 by fixing the cylindrical body 6b with screws 7 from three directions.

Filtration tank 5 has upper and lower lids 9 and 10 which are watertightly joined with ring packings 11 to the upper and lower openings of cylindrical transparent plastic body 8 having a predetermined volume.

An upper lid 9, which is the upper end of the filtration tank 5, has a right angle channel 12 communicating with the inner tank 3 and the external clean tank CCT, and an arcuate (major arc in the illustrated example) communicating with the outer tank 4 and the external sludge tank DCT. A downstream channel 13 is provided (see FIGS. 6 to 8).

The perpendicular flow path 12 is connected to a discharge port 14 for the filtered cutting fluid CC opened on one side of the upper lid 9 (left side in FIGS. 2 and 5) and a cleaning tank CCT provided on the central axis of the bottom of the upper lid 9. In the center of the bottom of the upper lid 9, the end face 16 of the circular terminal opening 15 having a slightly larger diameter than the outer diameter of the filter 2 is recessed.

A through hole 17 communicating with the right-angled flow path 12 is provided in the central portion of the upper portion of the upper lid 9 .

At the end opening 15 and at the upper end opening 3a of the inner tank 3, respectively, disc-shaped retaining flanges 18a interposed between the end faces 16 and 2a of these openings are protruding outward. By inserting each insertion port 18b of a cylindrical pipe joint 18 made of a lubricating material (for example, polyacetal), the inner tank 3 (filter 2) is held against the terminal opening 15 by the material characteristics of the pipe joint 18. The upper open end 3a is rotatably connected.

On the other hand, on the other side of the upper lid 9 (on the right side in FIGS. 2 and 5), there is an injection port for the used cutting fluid DC, which 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 are provided.

The downstream flow path 13 extends around the end face 16 of the terminal opening clockwise (counterclockwise in FIG. By gradually inclining the upper portion, which is the bottom of the groove, downward from the starting end to the terminal end, the upper end of the outer tank 4 is formed into a series of grooves continuing to the injection port 20. constitutes the descending flow path of

The lower lid 10 is formed in a dish shape, and is provided with a discharge port 21 formed of a screw hole at the center thereof. In addition, a disk-shaped seat plate 22 that supports the filter 2 in a rotatable manner 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 legs 23 projecting upward from the 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 columnar projection 22a with a slightly smaller diameter than the lower end opening 3b formed in the inner tank 3 (filter 2) projects upward.

A plain bearing bushing 24 made of a self-lubricating material (for example, polyacetal) is fitted into the lower opening 3b, and has a disc-shaped flange 24a that contacts the entire surface of the end surface 2b of the lower opening 3b. As a result, the lower end of the filter 2 is rotatably supported on the seat plate 22 around the projection 22a by the material characteristics of the slide bearing bush 24. As shown in FIG.

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

Then, by fastening the male threaded portion 25a on the upper lid 9 with a 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 constructed. 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, the filtration tank 5 divides the interior of the body 8 into the inner and outer tanks 3 and 4 by the filter 2, communicates the inner tank 3 and the perpendicular flow path 12, and communicates the outer tank 4 and the downstream flow path 13, An impeller 6 fitted on the filter 2 is arranged below the downstream flow path 13 in the outer tank 4 .

A ring packing 27 interposed between the top cover 9 and the lock nut 26 watertightly closes the through hole 17 .

In the filtration tank 5, the measuring part of a pressure gauge 29 is screwed in a watertight manner into a threaded hole 28 opened from the upper right side of the upper lid 9 so as to communicate with the pressure port 20. , to check the pressure in the outer tank 4 .

Furthermore, a discharge port 21 provided 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 provided with a cutting fluid separated from the used cutting fluid DC by the filtering device 1. A sludge pot 30 for storing scraps is detachably connected via a ball valve 31 .

The sludge pot 30 has a body 30a made of transparent plastic that allows the amount of chips stored to be visually recognized. Then, the shavings in it are taken out.

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

A coolant pump 33 for injecting the used cutting fluid DC into the outer tank 4 is connected to the injection port 20 through a pipe 34, and the suction side of the coolant pump 33 is connected to the sludge tank DCT. .

In the filtering device 1 having the above configuration, the used cutting fluid DC in the sludge tank DCT, which is injected into the outer tank 4 through the injection port 20 by the operation of the coolant pump 33, first passes through the arcuate downstream flow path 13. As a result, it turns into a spiral downward flow and flows down while swirling, is guided by the blades 6 above the filter 2 below the downward flow path 13, and rotates the filter 2 itself.

The filter 2 is supported by the material properties of the pipe joint 18 and the sliding bearing bushing 24 so that it can rotate smoothly up and down without rattling. In addition to being able to apply force, it can be connected to the cleaning tank CCT through the pipe joint 18 even though it is freely rotatable in this way.

The used cutting fluid DC in the entire outer tank 4 forms a series of spiral downward flow and flows downward along the inner peripheral surface of the outer tank 4. Along with the spiral downward flow, the filter 2 is rotated by the blades 6. 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 spirally guided downward in the outer tank 4 to reach the lower part of the outer tank 4. , and stored in the sludge pot 30 through the discharge port 27.

Also, the used cutting fluid DC pressurized 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 connected to the upper end opening 3a of the inner tank 3 through a discharge port 14. From there, it flows through the pipe 32 to the cleaning 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. It is difficult to adhere, and clogging of the outer peripheral surface of the filter 2 can be prevented.

During the filtration, if the filtering function of the filter 2 deteriorates, the amount of permeation of the used cutting fluid DC into the filter 2 decreases, and the pressure in the outer tank 4 rises above the normal value. If confirmed at 29, replace filter 2.

1 filtering device 2 filter
2a Upper end opening end face
2b Bottom opening end face 3 Inner tank
3a top opening
3b Lower end opening 4 Outer tank 5 Filtration tank 6 Impeller
6a Feather
6b Cylinder 9 Upper end
13 downstream channel
15 Terminal opening
16 Terminal opening end face
18 Pipe joint
18a retaining flange
18b outlet
20 Inlet
22 seat plate
22a Convex part
24 Plain bearing bush
24a Tsuba
30 Sludge Pot
32 Piping
33 Coolant pump
34 Piping
CT coolant tank
DC used cutting fluid
CCT cleaning tank
DCT sludge tank

Claims (3)

A filtering device piped between a sludge tank and a cleaning tank of a coolant tank,
A cylindrical filter tank is provided, which is partitioned into an inner tank and an outer tank that share the center with a cylindrical filter. It has a channel that communicates with the terminal opening provided on the central axis of the bottom, and a used cutting fluid injection port that connects the piping on the sludge tank side, and the upper end of the filter is rotatable at the upper end of the filtration tank. The upper end opening of the inner tank and the terminal opening of the filtration tank are communicated with each other, and chips are collected at the center of the lower end of the outer tank provided below the closed and rotatably supported lower end of the inner tank. Connect the sludge pot to store, connect the coolant pump that presses the used cutting fluid from the sludge tank into the outer tank , connect it to the piping on the sludge tank side, and create an arc-shaped down flow path that continues to the injection port inside the outer tank. A filtration device, wherein a plurality of blades are radially protruding from the upper portion of the outer peripheral surface of the filter formed at the upper end and below the downstream flow path in the outer tank. Each of the end opening and the upper end opening of the inner tank is provided with a disc-shaped retainer flange interposed between the end faces of these openings and protruding outward from a cylindrical tubular body made of a self-lubricating material. Each insertion port of the pipe joint is inserted, and a disk-shaped flange interposed between the end face of the lower end opening opened in the inner tank and the seat plate provided in the filtration tank so that it can be placed is outside. Claim 1, characterized in that a sliding bearing bush made of self-lubricating material protruding from the side is fitted on the projection projecting from the center of the seat plate and is fitted into the lower end opening of the inner tank. Filtration device. 3. A filtering device according to claim 1, wherein an impeller having a plurality of blades radially protruding from a cylindrical body is fitted on the top of the filter.

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