JP3479003B2 - Filtration device - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a grinder,
The present invention relates to a filtering device that removes foreign matters existing in a liquid such as a cutting liquid used for lathes, machining centers and the like.

[0002]

2. Description of the Related Art Conventionally, for example, a device shown in FIG. 4 has been used as a cutting fluid filtering device used in a machine tool such as a grinding machine or a lathe. This device uses diatomaceous earth as a filter medium, forms a precoat layer of the above diatomaceous earth on the outer peripheral surface of the filter tube 51, and allows the cutting fluid to pass through the precoat layer for filtration.

That is, this apparatus has a dirty tank 53 for storing dirty liquid discharged from a machine tool and a filter tube 51 having a diatomaceous earth precoat layer formed thereon.
And a clean chamber 54 for storing the clean liquid filtered by the filter chamber 52.
Further, a diatomaceous earth supply feeder 56 is provided, and a slurry tank 57 for producing a slurry of diatomaceous earth is provided. In FIG. 4, 58 is a recovery tank for temporarily storing the used diatomaceous earth together with the dirty liquid, and 59 is a liquid for removing the diatomaceous earth and the like from the mixed liquid of the used diatomaceous earth and the dirty liquid collected in the recovery tank. It is a liquid separator.

The above filtering device is used as follows. That is, first, the diatomaceous earth in the feeder 56 is put into the slurry tank 57 and mixed with the clean liquid to generate a slurry. The slurry is introduced into the filter chamber 52 by the slurry pump 60, returned to the slurry tank 57, and circulated. At this time, a precoat layer 61 of diatomaceous earth is formed on the outer peripheral portion of the filter tube 51 in the filter chamber 52, as shown in FIG. Figure 5
In 62, 62 is a punched hole formed in the peripheral wall of the filter tube 51, and 63 is a metal mesh wound around the outer periphery of the filter tube 51.

After the precoat layer 61 is formed, the slurry pump 60 is stopped and the filter pump 55
To drive. Then, the dirty liquid in the dirty tank 53 is introduced into the filter chamber 52 to bring the lower space of the filter chamber 52 into a pressurized state, and the filter tube 51
The pre-coat layer 61 formed in the above is passed through for filtering, and the filtered clean liquid is sent from the filter chamber 52 to the clean tank 54. At this time, the foreign matter in the dirty liquid is captured by the precoat layer 61, and the pressure in the lower space of the filter chamber 52 gradually increases as the precoat layer 61 becomes clogged.

When the pressure in the space below the filter chamber 52 reaches a predetermined value, the dump valve 64 below the filter chamber 52 and the air valve 65 above the filter chamber 52 are opened to introduce compressed air from above the filter chamber 52. Then, the clean liquid in the upper part of the filter chamber 52 is caused to flow backward, and the diatomaceous earth (precoat layer 61) mixed with the foreign matter is recovered together with the dirty liquid in the recovery tank 58.
It is collected inside and temporarily stored.

Then, the slurry in the slurry tank 57 is circulated again to form the diatomaceous earth precoat layer 61 on the filter tube 51, and then the filter pump 55 is operated to repeat the cycle of filtering the dirty liquid. . In the slurry of the used diatomaceous earth and the dirty liquid in the recovery tank 58, the diatomaceous earth or foreign matter and the dirty liquid are separated by the separator 59, the diatomaceous earth or the like is drained and discharged into the waste box 66, and the dirty liquid is discharged. Collected in the dirty tank 53.

[0008]

[Problems to be Solved by the Invention]

However, although the filtration device has relatively high filtration accuracy, the dirty liquid is used as a precoat layer 6 of diatomaceous earth.
Since the filtration is performed at 1, the precoat cycle for forming the precoat layer 61 on the filter tube 51 is necessary.
Since this precoat cycle is performed while pressurizing the lower space of the filter chamber 52 with the slurry pump 60, it takes a considerable amount of time to form the precoat layer 61. During this period, the filtration is interrupted and a clean liquid is supplied to the machine tool. There is a problem that you can not send. In addition, a circulation device for precoating that circulates the slurry to form the precoat layer 61 is required, and the size of the device itself is increased by that much to occupy an installation place, which causes a cost increase.

Therefore, an apparatus as shown in FIG. 6 has been proposed and implemented as a filtering apparatus that does not require precoating. This device filters dirty liquid using a filter 70 composed of a long filter paper or filter cloth, and a filter tank 71 partitioned vertically by an insole 73 having a large number of punched holes 72. The dirty liquid is filtered by the filter 70 that is provided to the upper space of the filtration tank 71 sequentially.

That is, the dirty liquid in the dirty tank 53 is introduced into the filtration tank 71 by the introduction pump 74. In the upper space of the filtration tank 71, the filter 70 is rolled.
Are supplied and laid on the insole 73. Then, the lower space of the filtration tank 71 is sucked by the suction pump 75 to reduce the pressure, so that the dirty liquid is passed through the filter 70 to be filtered and collected in the clean tank 54.

When the clogging of the filter 70 progresses, the pressure in the lower space of the filtration tank 71 gradually decreases. When this pressure drop is detected by the pressure sensor 76 and reaches a predetermined value, the valve 77 is opened, and the clean liquid is introduced into the space below the filtration tank 71 to pressurize the space, and the filter 70 from the insole 73. The used filter 70 is floated and wound up, and a new filter 70 is supplied.

[0013] However, since the above filtering apparatus does not require a precoat cycle, it has the advantage that filtration is not interrupted and the equipment is relatively simple and compact, but the filtration accuracy is low and foreign matter of 30 μm to 40 μm or less is removed. There is a big problem in terms of performance that it cannot do this.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a filtration device which does not interrupt filtration and has relatively high filtration accuracy.

[0015]

In order to achieve the above object, the filter device of the present invention forms a deposition layer of powdery particulate filter aid on the plate surface of a filter plate, and the liquid is deposited in the deposition layer. A filtering device for filtering, a hollow filter unit having a filter plate on at least a part of its surface, a filter tank in which a liquid to be filtered is stored and a filter unit is housed, and the inside of the filter unit is sucked comprising a suction pump, the auxiliary agent supply means having a supply pipe for supplying the filter aid on the plate surface near the filter plate, the Fi
The filter unit consists of multiple thin boxes with filter plates on both sides.
Jo of full Irutapaneru is internally configured is arranged in a plan view radially so as to communicate with each other, from a supply pipe of substantially opposed filter plates of the filter panel disposed above radially supplies a filter aid The point is that it is like this.

That is, the filtration device of the present invention comprises a hollow filter unit having a filter plate on at least a part of the surface thereof, a filtration tank in which the liquid to be filtered is stored and the filter unit is housed, and the above filter. A suction pump for sucking the inside of the unit and an auxiliary agent supply means for supplying a filter auxiliary agent to the vicinity of the plate surface of the filter plate are provided. Therefore, the negative pressure in the filter unit generated by the suction pump causes the filter aid supplied from the aid supply means to be attracted to the plate surface of the filter plate, thereby forming a deposited layer quickly. Therefore, there is almost no interruption of filtration as in the past. Moreover, a relatively high filtration accuracy can be secured. Further, since the filter unit is configured by radially providing thin box-shaped filter panels having filter plates on both sides, the effective area of the filter on which the filter aid is deposited is increased, and the filtration efficiency is improved. .
Then, the filter aid supplied in the vicinity of the plate surface of the filter plate that is substantially opposed to the filter panel radially arranged,
It is attracted to the plate surface of the filter plate to form a deposited layer quickly, and the filtration is hardly interrupted.

In the filtering device of the present invention, the above filter
Unit is accommodated in Uroka tank by the plate surface of the filter plate faces the horizontal, releasing the negative pressure in the filter unit negative pressure in the filter unit when it reaches a predetermined value, the negative pressure releasing means In addition, when the used filter aid is dropped from the plate surface of the filter plate by swinging the filter unit by the unit swinging means , the filter aid deposits fill when the layer is a negative pressure in the filter unit clogged reaches a predetermined value, automatically the negative pressure is released in the filter unit by the negative pressure release means Rutotomoni, automatically by the unit moving means
The filter unit is swung , and the negative pressure inside the filter unit is released and the filter unit is swung, so the deposited layer of the used filter aid easily peels off from the filter plate surface and falls.
You.

In the filtering apparatus of the present invention, if a plurality of filter units are provided and the negative pressure in the filter units is released alternately or in sequence, the deterioration of filtration accuracy should be minimized. You can

In the filter device of the present invention, when the filter aid is mainly composed of cellulose fibers, the filter aid is easily bridged on the mesh and the filter aids are easily entangled with each other, so that the filter surface is extremely A deposited layer is formed quickly. Therefore, the filtration accuracy is improved.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described in detail.

FIG. 1 shows an embodiment of the filtration device of the present invention. This is a hollow filter unit 1,
A filtration tank 2 in which the filter unit 1 is stored and in which dirty liquid is stored, a suction pump 3 for sucking the inside of the filter unit 1, and a slurry of a filter aid supplied to the periphery of the filter unit 1. And a slurry tank 4 for storing Then, a deposition layer of powdery particulate filter aid is formed on the surface of the filter unit 1, and the liquid is filtered by the deposition layer.

More specifically, the filter tank 2 accommodates two filter units 1 and the introduction line 11
Thus, the dirty liquid such as the grinding liquid discharged from the machine tool is introduced. A discharge conveyor 12 is provided at the bottom of the filter tank 2 to discharge the used filter aid removed from the filter unit 1.

As shown in FIG. 2, the filter unit 1 is constructed by arranging eight thin box-shaped filter panels 5 radially on a peripheral wall of a cylindrical body 7 so as to communicate with each other in a plan view. There is. The panel plates (filter plates) 17 on both sides of each of the filter panels 5 have a large number of punched holes 6 and are covered with a wire mesh 8. The filter unit 1 is housed in the filtration tank 2 such that the panel plate 17 is oriented horizontally (the cylinder 7 is oriented vertically).

A slurry supply pipe 15 is provided on the upper side of the filter unit 1 so as to communicate with the slurry tank 4 via a slurry pump 14. The slurry tank 4 is provided with a flow switch 23, and when the liquid level is lowered, the electromagnetic opening / closing valve 24 is opened to open the supply line 1.
It is designed to replenish the clean liquid from 3. Also,
The slurry tank 4 is configured such that the filter auxiliary agent stored in the auxiliary agent tank 25 is replenished by the feeder 26.

As shown in FIG. 3, the slurry supply pipe 15 has a rectangular ring shape and is arranged on the upper side of the filter unit 1. Then, a supply pipe 16 is hung between the panel plates 17 of the filter panel 5 which are radially arranged so as to face each other, and the slurry of the filter aid is supplied from the supply pipe 16 to the vicinity of the panel plate 17. It is like this.

The inside of the cylindrical body 7 of the filter unit 1 communicates with the suction pump 3 via the pump communication passage 9 so as to suck the inside of the hollow filter unit 1. By this suction, the inside of the filter unit 1 is made a negative pressure, and the plate surface of the panel plate 17 of the filter panel 5 (on the surface of the wire mesh 8)
The filter aid is attracted to and deposited on the filter, and the dirty liquid is passed through the deposited layer to filter the foreign matter. Then, the clean liquid sucked and filtered by the suction pump 3 is supplied to the machine tool through the supply line 13.

On the other hand, this filter device has an electromagnetic opening / closing valve 19
A break tank 20 is provided to release the negative pressure in the pump communication passage 9 and the filter unit 1 by supplying the clean liquid to the pump communication passage 9 via the. This break tank 20 has a flow switch 2
1 is provided, and when the liquid level is lowered, the electromagnetic on-off valve 22 is opened to replenish the clean liquid from the supply line 13.

An air cylinder 10 is attached to the upper portion of the filter unit 1 so that the filter unit 1 can be vertically swung. Further, the pump communication passage 9 is provided with a pressure sensor 18 for detecting a pressure change in the pump communication passage 9. Then, when the deposition layer of the filter aid formed on the filter panel 5 is clogged and the negative pressure in the pump communication passage 9 and the filter unit 1 reaches a predetermined value, the electromagnetic opening / closing valve 19 is opened. The negative pressure in the filter unit 1 is released and the air cylinder 1
0 is operated to swing the filter unit 1. Due to the release of the negative pressure and the swinging of the filter unit 1, the deposited layer of the filter aid is peeled off and the discharge conveyor 1
It is designed to fall on 2.

The filtration device having the above construction is operated, for example, as follows.

That is, first, the dirty liquid discharged from the machine tool or the like is introduced into the filtration tank 2 through the introduction line 11 and the filter unit 1 is hidden below the liquid surface.
Fill the inside with dirty liquid. On the other hand, in the slurry tank 4, a clean liquid and a filter aid are mixed in a predetermined mixing ratio to generate a slurry.

Here, the filter aid is not particularly limited as long as it has an approximately powdery grain form.
Various types can be used. For example, various materials such as diatomaceous earth, cellulose fiber, zeolite, activated carbon, silica gel, glass fiber, ceramic fiber can be used. Among these, cellulose fibers are particularly preferably used because they easily bridge on the mesh, the filter aids are easily entangled with each other, and a deposited layer is formed extremely quickly on the plate surface of the panel plate 17. In the present invention,
The term "powder" means that it can be mixed with a liquid to form a slurry, and the microscopic shape is meant to include various shapes such as fibrous, lumpy and flaky shapes. .

Next, the slurry pump 14 is operated to supply the slurry in the slurry tank 4 to the vicinity of the panel plate 17 of the filter panel 5, and the suction pump 3 is operated to make the inside of the filter unit 1 a negative pressure. By this suction, the filter aid supplied as the slurry is sucked into the punch holes 6 of the panel plate 17 together with the liquid, and is deposited on the plate surface of the panel plate 17 (on the surface of the wire mesh 8). In this way, since the filter aid is sucked and deposited by the negative pressure, the deposition layer is formed extremely quickly.

When a deposited layer is formed to some extent,
The slurry supply is stopped and the suction pump 3 continues to operate.
By this suction, the dirty liquid in the filter tank 2 passes through the filter aid depositing tank and is filtered. The filtered clean liquid is supplied from a supply line 13 to a machine tool or the like. In this way, filtration is continuously continued.

Here, if foreign matters are accumulated in the deposited layer of the filter aid due to filtration and clogging occurs, the negative pressure in the filter unit 1 and the pump communication passage 9 increases.
Then, when the clogging progresses and the negative pressure reaches a predetermined value,
The increase in the negative pressure is detected by the pressure sensor 18, the electromagnetic opening / closing valve 19 is opened to release the negative pressure in the filter unit 1, and the air cylinder 10 is operated to swing the filter unit 1 up and down. By doing so, the deposited layer of the used filter aid is peeled off from the filter panel 5 and dropped onto the discharge conveyor 12. At this time, since the panel board 17 on which the deposited layer of the filter aid is formed is oriented laterally, the used filter aid is easily peeled off and dropped. The same applies when the panel plate 17 faces downward.

Next, by operating the slurry pump 14 to supply the slurry in the slurry tank 4 to the vicinity of the panel plate 17 of the filter panel 5, the filter panel 5
A filter aid is deposited on to form a deposition layer, and filtration is repeated. On the other hand, by operating the discharge conveyor 12, the used filter aid on the discharge conveyor 12 is discharged from the filter tank 2.

Here, the negative pressure release and swing of the two filter units 1 may be performed at the same time, but they may be performed alternately or sequentially. By doing so, it is possible to minimize a decrease in filtration accuracy.

As described above, according to the above filtering apparatus, the negative pressure in the filter unit 1 generated by the suction pump 3 causes the filter aid supplied from the slurry tank 4 to
It is attracted to the plate surface of the panel plate 17 of the filter panel 5, a deposited layer can be quickly formed, and the interruption of filtration unlike the conventional case is almost eliminated. Moreover, 1
It was possible to secure high filtration accuracy with a removal rate of foreign matter of 0 μm or more of 95% or more.

Further, in the filter unit 1, since the thin box-shaped filter panel 5 having the panel plates 17 on both sides is radially provided on the peripheral wall of the cylindrical body 7, the filter unit of the filter is deposited. The effective area is increased and the filtration efficiency is improved.

In the above embodiment , the filtration tank 2
The panel may be divided into a plurality of panels 17 and one of the chambers may be sucked by the suction pump 3. Further, the filter unit 1 is not limited to two units, and may be one unit or three or more units.

Further, in the above-mentioned embodiment, the one for filtering the cutting fluid of the machine tool is exemplified, but the invention is not limited to this, and the fluid to be filtered may be a coolant such as a rolling mill or a boiler recovery fluid. It is intended to include water, plating solutions, and various liquids such as beer and beverages such as fruit juice.

[0041]

As described above, according to the filtration device of the present invention, the filter aid supplied from the aid supply means is reduced by the negative pressure in the filter unit generated by the suction pump.
It is attracted to the panel surface of the filter panel and quickly forms a deposited layer. Therefore, there is almost no interruption of filtration as in the past. Moreover, high filtration accuracy can be secured. The filter unit is, since the thin box-shaped filter panel having a filter plate on both sides are configured radially provided, the effective area of the filter which filter aid is deposited is increased, better filtration efficiency Become. Then, the filter aid supplied in the vicinity of the plate surface of the filter plate, which is substantially opposed to the filter panel radially arranged, is attracted to the plate surface of the filter plate to form a deposited layer quickly, and the filtration is interrupted. Is almost gone.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a filtration device according to an embodiment of the present invention.

2A and 2B are views showing a filter unit, in which FIG. 2A is a cross-sectional view and FIG. 2B is a front view.

FIG. 3 is a diagram showing a peripheral structure of a filter unit,
(A) is a cross-sectional view and (b) is a front view.

FIG. 4 is a configuration diagram showing a conventional filtration device.

FIG. 5 is a cross-sectional view showing the inside of the filter chamber of the filtration device.

FIG. 6 is a configuration diagram showing another conventional filtering device.

[Explanation of symbols]

1 Filter unit 2 filtration tanks 3 suction pump 14 Slurry pump

Claims (5)

(57) [Claims] 1. A filter device for forming a deposition layer of a particulate filter aid on a plate surface of a filter plate, and filtering a liquid by the deposition layer, the filter device comprising at least a part of the surface thereof. A hollow filter unit, a filtration tank in which the liquid to be filtered is stored and the filter unit is housed, and a suction pump for sucking the inside of the filter unit,
A supply pad that supplies a filter aid near the plate surface of the filter plate.
And a co-agent supply means having a type, the Firutayu two <br/> Tsu DOO, a plurality of thin box-shaped filter panel equipped with filter plates on both sides, in a plan view radially so that interior communicate with each other A filter device which is arranged and configured to supply a filter aid from a supply pipe between filter plates which are substantially opposed to each other in the radially arranged filter panel. 2. The filter unit comprises a filter plate.
When the negative pressure inside the filter unit reaches a predetermined value, the negative pressure releasing means is accommodated in the filtration tank so that the plate surface faces sideways.
Together when releasing the negative pressure in the filter unit by
To, by swinging the Firutayu knit by the unit moving means, a filtration device according to claim 1, characterized in that adapted to drop the used filter aid from a plate surface of the filter plate. 3. A used filter dropped from the plate surface of the filter plate.
The filter device according to claim 2, wherein the only filter aid is dropped onto a discharge conveyor and discharged . 4. A plurality of filter units, which are alternately arranged
In turn properly, the filter Uni Tsu preparative filtering device according to claim 2 or 3, wherein is adapted to release the negative pressure in the. 5. The filter device according to claim 1, wherein the filter aid has a cellulose fiber as a main component.