JPH11319807A - Device for recovering contaminant in liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for recovering contaminants in liquid capable of recovering various contaminants such as chips or oil components and free from the sedimentation of sludge. SOLUTION: Many bubbles 14 generated in a 1st tank 20 are moved to a 2nd tank 3, scooped up on a meshlike belt 80 and transported to the upper part than the liquid level of the 2nd tank 30 accompanied with the rotation of the belt 80. The contaminants are stuck to the bubbles 14. Therefore, the contaminants are also transported by the meshlike belt 80 together with the bubbles 14. The bubbles 14 to which the contaminants are stuck, are moved to the lower side of an air ejector 90 accompanied with the rotation of the meshlike belt 80. Because the air is ejected downward from an ejecting opening 92 of the air ejector 90, the bubbles 14 moved to the lower side of the air ejector 90 are blown off together with the contaminants to be housed in a housing tank 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for collecting contaminants in a liquid for recovering contaminants such as chips and sludge mixed in the liquid.

[0002]

2. Description of the Related Art For example, when cutting a metal material with a machine tool, cutting is generally performed while applying a coolant called a coolant liquid to the metal material. For this reason, contaminants such as chips generated by cutting and oil attached to the metal material are mixed in the used coolant liquid. Heretofore, there have been proposed some apparatuses for collecting such contaminants from a liquid in which such contaminants are mixed.

[0003] As one of the devices for recovering the contaminants from the coolant liquid, there is known a device for recovering the chips from the cutting oil in which the chips are mixed (see JP-A-2-218535). This equipment removes chips from the cutting oil using a conveyor, separates and extracts the cutting oil with a cyclone,
It is a device that separates and extracts oil from the chips using a centrifuge. Therefore, this device can be used for conveyors, cyclones,
It is a large and expensive device equipped with a centrifuge.

[0004] As another device, a device for removing chips from cutting oil mixed with chips has been known (see Japanese Patent Application Laid-Open No. Hei 5-237739). In this device, a cutting oil and chips are separated using a filter. For this reason, the filter may be clogged, and a troublesome operation such as maintenance is required.

[0005] As described above, all of the conventional various apparatuses cannot collect various contaminants such as chips and oil, collectively, are expensive and large, and require maintenance work. I do.

[0006]

Therefore, the present inventor has proposed:
A device for collecting contaminants in liquid that requires almost no maintenance work was proposed (Japanese Patent Application No. 9-195323). This device is equipped with a bubble generator that generates bubbles in a liquid, a bubble crusher that crushes the bubbles, a collector that collects the crushed bubbles, and the like. The crushed bubbles are combined with the liquid (coolant liquid). It is collected in the bubble container of the collection machine.

However, it has been found that when this apparatus is used for a long period of time, sludge (sludge) precipitates in the bubble container. Even if the apparatus is used for a long time, the amount of the sludge settled is small, and if the sludge is removed, the apparatus can be used for a long time. However, there is a problem that the work of removing sludge is troublesome and troublesome.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide an apparatus for collecting contaminants in a liquid that can collect various contaminants such as chips and oils and that does not precipitate sludge.

[0009]

According to the present invention, there is provided a liquid contaminant recovery apparatus for recovering a contaminant from a liquid in which the contaminant is contaminated. (1) an air bubble generator for generating air bubbles in the liquid, (2) a mesh belt for scooping air bubbles generated by the air bubble generator, and (3) air bubbles scooped by the mesh belt. And an air ejector for ejecting air.

Here, the bubble generator may generate (4) bubbles at the bottom of the liquid.

(5) The endless belt, one end of which is located in the liquid and the other end of which is located above the liquid level of the liquid, is for scooping up the bubbles while rotating. It may be.

The apparatus for collecting contaminants in a liquid further comprises: (6) a first tank in which the liquid is stored and the bubble generator is installed; and (7) a first tank disposed adjacent to the first tank. A second tank, in which one end of the mesh belt is located, in which the liquid in the first tank and the bubbles generated in the first tank sequentially move.

Further, the first tank may have (8) a plate formed on a side wall of the first tank for preventing the liquid in the first tank from being swirled.

Further, the apparatus for collecting contaminants in a liquid includes:
(9) A storage tank may be provided for storing the contaminants blown off by the air blown from the air blower.

[0015] Furthermore, the second tank is provided with (10)
A discharge port for discharging the liquid accumulated in the second tank may be formed.

Further, the apparatus for collecting contaminants in a liquid includes (1)
1) A liquid level adjusting mechanism connected to the discharge port for adjusting the level of the liquid level in the second tank may be provided.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

Referring to FIGS. 1 and 2, an embodiment of the apparatus for recovering contaminants in liquid according to the present invention will be described.

FIG. 1 is a schematic diagram showing a schematic structure of an embodiment of the apparatus for collecting contaminants in liquid. FIG. 2 is a plan view schematically showing a part of the apparatus for collecting contaminants in liquid of FIG.

The liquid contaminant recovery device 10 includes a first tank (container) 20 for storing the liquid 12 containing contaminants.
And a second tank 30 adjacent to the first tank 20. Further, a storage tank 40 for storing the collected contaminants is placed near the second tank 30.

The first tank 20 has a rectangular parallelepiped shape,
A plate 24 extending in the height direction of the first tank 20 is fixed to each of the four side walls 22. These plates 24
As described later, the first tank 2
Prevents liquid 12 in zero from swirling. The first
The tank 20 may be cylindrical.

As shown in FIG. 1, the second tank 30 has a triangular cross section. The bottom of the second tank 30 is higher than the center of the first tank 20 in the depth direction. The side wall 32 of the second tank 30 is also used as one of the four side walls 22 of the first tank 20. In addition, the bottom wall 34 of the second tank 30 is inclined so as to become higher as the distance from the first tank 20 increases. FIG.
Here, the side wall 36 of the second tank 30 is omitted. The side wall 36 has a discharge port 36 a through which the coolant 18 stored in the second tank 30 is discharged. The outlet 36a is connected to the coolant tank 16 via a liquid level adjusting mechanism 70 and a vinyl hose 78 described later. The bubbles 14 generated in the first tank 20 and the liquid 12 stored in the first tank 20 flow into the second tank 30 through the opening 28.

The liquid contaminant recovery apparatus 10 includes a bubble generator 50 for generating bubbles in the liquid, in addition to the three tanks 20, 30, and 40 described above. The bubble generator 50 is installed in the first tank 20, and generates bubbles at the bottom of the first tank 20.

The bubble generator 50 is provided with a cover 2 of the first tank 20.
6 and has a hollow rotary shaft 52 extending substantially perpendicular to the liquid surface of the liquid 12, and a motor 54 for rotating the rotary shaft 52. The upper part of the rotating shaft 52 protrudes above the liquid surface, and a number of holes (not shown) are formed in the upper part. The upper part is covered with a bearing box 56 fixed to the lower surface of the lid 26. Bearing housing 56
Is connected to an air introduction pipe 58 for taking in external air. On the other hand, the lower part of the rotating shaft 52 is located at the bottom of the first tank 20, and a number of holes (not shown) are also formed in this lower part. The lower portion is covered with a rotating body 60 having a large number of holes 62a formed in a peripheral wall 62. The rotating body 60 is fixed to the rotating shaft 52 and rotates together with the rotating shaft 52.

The liquid contaminant recovery apparatus 10 also includes a mesh belt (mesh belt) 80. Reticulated belt 8
Reference numeral 0 denotes an endless belt that is stretched between a driven roller 82 rotatably fixed to the bottom of the second tank 30 and a driving roller 84 disposed diagonally above the second tank 30.
When a motor (not shown) controlled by the inverter rotates, the driving roller 84 rotates, and the mesh belt 80 rotates in the direction of arrow A. Thereby, the air bubbles 14 floating on the liquid surface of the second tank 30 are scooped up.
As the mesh belt 80, for example, a fluororesin belt is used, and the mesh size is determined according to the size and type of the contaminants in the liquid 12. Further, a material made of aramid fiber or glass fiber may be used so as to withstand long-term use. Note that the number of rotations of the mesh belt 80 is experimentally determined according to the contamination of the liquid 12 (the ratio of contaminants). Also, if the mesh belt 80 is rotated too fast, the liquid 18 in the second tank 30 will also rotate.
There is a possibility that it may be scooped up to zero and fall into the storage tank 40. On the other hand, if the mesh belt 80 is rotated slowly, the amount of the contaminants collected decreases.

At a position sandwiched between the mesh belts 80, an air ejector 90 for ejecting air to the bubbles 14 scooped up by the mesh belt 80 is arranged. The air ejector 90 has a cylindrical shape extending in parallel with the drive roller 84, and has a plurality of ejection ports 92 formed at a lower portion. This air ejector 90 is connected to a blower 96 via a pipe 94. When the blower 96 is driven, air is ejected from the ejection port 92 in the direction of arrow B.

The liquid level adjusting mechanism 70 will be described with reference to FIG.

FIG. 3 is a schematic diagram showing the liquid level adjusting mechanism 70.

The liquid level adjusting mechanism 70 is for adjusting the height of the liquid level stored in the second tank 30. The liquid level adjusting mechanism 70 includes a pipe 72 having one end connected to the outlet 36a, and a joint (socket) 74 connected to the other end of the pipe 72. The joint 74 is movably fixed to a threaded adjustment rod 76 so as to be able to move up and down (arrow B direction) by a predetermined distance.
By moving the joint 74 upward, the second tank 30
The height of the liquid level stored in the tank increases. On the other hand, by moving the joint 74 downward, the height of the liquid surface stored in the second tank 30 decreases. Thus, the second tank 3
By adjusting the liquid level of the first tank 20
The height of the liquid level can also be adjusted.

The joint 74 has one end 7 of a vinyl hose 78.
8a is connected. The other end 78b of the vinyl hose 78 is located above the liquid level 12a in the coolant tank 16, and the liquid in the second tank 30 returns to the coolant tank 16. By the way, when the other end 78b of the vinyl hose 78 is immersed in the liquid 12, depending on the position of the joint 74, the principle of the siphon is used.
Almost all of the liquid 12 in the second tank 30 may return to the coolant tank 16. Therefore, even when the other end 78b of the vinyl hose 78 is immersed in the liquid 12, the joint 74 is used to prevent such a situation from occurring.
Is formed with an air vent hole 74a.

Here, as an example, a liquid contaminant recovery apparatus 1
0, recovering these contaminants from the liquid (coolant liquid) 12 in which contaminants such as chips and cutting oil are mixed,
The case of obtaining a coolant liquid with almost no contaminants will be described.

A coolant tank 16 containing a liquid 12 containing contaminants such as chips and cutting oil is placed below the liquid contaminant recovery device 10 (for example, below the floor).
The coolant tank 16 is connected to the bottom of the first tank 20 via a metering pump 17. Coolant tank 1
The liquid 12 stored in 6 is first pumped by the metering pump 17.
It is sent to the bottom of the tank 20. The liquid 12 sent to the first tank 20 is stored here. In the liquid 12 in the first tank 20, a number of bubbles 14 are generated by the bubble generator 50.
Is generated.

In generating bubbles in the liquid 12 using the bubble generator 50, the motor 54 is rotated to rotate the rotating shaft 52. The rotation of the rotating shaft 52
0, the central portion of the rotating body 60 becomes negative pressure, and external air is supplied to the air introducing pipe 58, the bearing housing 56, and the rotating shaft 52.
And is introduced into the inside of the rotating body 60. The introduced air mixes with the liquid 12 inside the rotating body 60 to form bubbles. These bubbles are formed by a large number of holes 62
a into the liquid 12 and become bubbles 14. The air bubbles 14 that have flowed out into the liquid 12 float toward the liquid surface. During the floating, a mixed portion such as chips or oil adheres to the surface of the air bubbles 14. Accordingly, since the contaminants in the liquid 12 are collected in the bubbles 14, the contaminants are hardly mixed in the liquid 12. The rotation speed of the rotation shaft 52 is, for example, 2000 times / minute.

When the bubbles 14 are generated, the liquid 12 is swirled by the rotation of the rotating shaft 52 and the rotating body 60. When the vortex is thus formed, the air bubbles 14 floating on the liquid surface gather at the center of the vortex and do not move to the second tank 30 through the opening 28. Therefore, as described above, the first tank 2
A plate 24 was formed on the zero side wall 22 so that no vortex was formed by the plate 24. As a result, the bubbles 14 float uniformly on the liquid surface in the first tank 20, and the floating bubbles 14 gradually move to the second tank 30 through the opening 28.

As described above, the lower portion of the rotating shaft 52 is located at the bottom of the first tank 20, and therefore, the bubbles 14 are generated at the bottom of the liquid 12. Therefore, the bubbles 14 float from the bottom of the liquid 12 toward the liquid surface, and the bubbles 14 and the liquid 12 are in contact for a long time. Adheres efficiently to In this way, a large number of air bubbles 14 to which chips, cutting oil, and the like have adhered float on the liquid surface of the liquid 12 in the first tank 20. The layer of the bubbles 14 has a thickness of about 20 to 50 mm.

As described above, the large number of bubbles 14 floating on the liquid surface of the first tank 20 gradually pass through the opening 28 to the second
Move to tank 30. The air bubbles 14 moved to the second tank 30 are scooped up by the mesh belt 80, and are carried above the liquid level of the second tank 30 with the rotation of the mesh belt 80. Contaminants are attached to the bubbles 14.
Accordingly, the contaminants are carried by the mesh belt 80 together with the bubbles 14. The air bubbles 14 to which the contaminants are attached move below the air ejector 90 as the mesh belt 80 rotates. Since air is ejected downward from the ejection port 92 of the air ejector 90, the air bubbles 14 that have moved below the air ejector 90 are blown away together with contaminants. As shown in FIG. 1, the blown air bubbles 14 and the contaminants 15 are collected in the storage tank 40.

On the other hand, the liquid 12 also enters the second tank 30 from the first tank 20 through the opening 28. Liquid 12
Since most of the contaminants mixed in the second tank 30 are attached to the bubbles 14, almost no contaminants are mixed in the liquid 18 that has entered the second tank 30. Therefore, the second tank 30
The liquid 14 containing almost no contaminants is stored therein. The liquid 14 is supplied from the discharge port 36 a to the coolant tank 16.
Is returned to. This prevents the liquid 12 from overflowing the second tank 30. Therefore, as the contaminant is recovered by operating the contaminant-in-liquid recovery device 10, the proportion of the contaminant in the liquid 12 in the coolant tank 16 decreases.

As described above, in the liquid contaminant recovery apparatus 10,
Bubbles 1 generated by the bubble generator 50 and floating on the liquid surface
4 is scooped up by a mesh belt 80 and blown off by an air ejector 90 to collect contaminants. For this reason, since the components for cleaning or replacement like filters are not used in the liquid contaminant recovery device 10, there is almost no need for maintenance work. In addition, since large and expensive devices such as a conveyor, a cyclone, and a centrifuge are not used, the size is reduced and the cost is reduced accordingly. Further, since the bubbles 14 and the contaminants 15 are blown away, the second
There is no sludge settling in the tank 30.

In the above-described embodiment, the apparatus for collecting contaminants in liquid of the present invention is used as an apparatus for recovering contaminants such as chips and oil from coolant liquid in which contaminants are mixed. The present invention is not limited thereto, and for example, it can be used as a device for collecting fish droppings and remaining food from a fish tank. In addition, any device can be used as long as it is a device that recovers contaminants physically mixed (not dissolved) in the liquid.

[0040]

As described above, according to the apparatus for collecting contaminants in a liquid according to the present invention, contaminants such as chips, oil, and sludge adhere to the surface of bubbles generated by the bubble generator. ,
By jetting air into these bubbles, the bubbles are broken and contaminants are blown off through the mesh of the mesh belt. Thereby, the contaminant can be separated and recovered from the liquid in which the contaminant is mixed. In addition, since air bubbles to which contaminants are attached are blown off, sludge does not settle. Therefore, various contaminants such as chips and oil can be collectively collected. In addition, the liquid contaminant recovery device does not use components to clean or replace like filters,
Almost no maintenance work is required. In addition, since large and expensive devices such as a conveyor, a cyclone, and a centrifuge are not used, the size is reduced and the cost is reduced accordingly.

If the bubble generator generates bubbles at the bottom of the liquid, the bubbles and the liquid are in contact for a long time before the bubbles generated at the bottom float on the liquid surface. Therefore, a large amount of contaminants mixed in the liquid easily adhere to the air bubbles. Therefore, the contaminants can be recovered more efficiently.

In the case where the mesh belt is an endless belt whose one end is located in the liquid and the other end is located above the liquid level of the liquid and which scoops up the bubbles while rotating. , Continuously scoops up bubbles because one end of the endless belt is located in the liquid. As a result, the contaminants can be continuously collected.

Further, the apparatus for collecting contaminants in the liquid includes a first tank in which the liquid is stored and a bubble generator is installed;
The second liquid in which the liquid in the first tank and the air bubbles generated in the first tank are sequentially moved is disposed adjacent to the first tank and at which one end of the mesh belt is located. When a tank is provided, the air bubbles that have sequentially moved from the first tank to the second tank are scooped up by the mesh belt, so that even if a large amount of air bubbles are generated in the first tank, the mesh belt is Does not scoop up large amounts of air bubbles. Therefore, the mesh belt scoops up only a predetermined amount of air bubbles that have moved sequentially, so that air is ejected from the air ejector to all the air bubbles that have been scooped, and all these air bubbles are more reliably broken. The contaminants are blown away.

Further, the first tank is provided with the first tank.
The plate that prevents the liquid in the tank from swirling is the first
When the liquid is formed on the side wall of the tank, the liquid in the first tank does not form a vortex, so that the bubbles float uniformly on the liquid surface and move smoothly to the second tank.

Further, when the liquid contaminant recovery device includes a storage tank for storing the contaminants blown off by the air jetted from the air ejector, the contaminants are stored in the storage tank. In addition, it is possible to prevent contaminants from scattering around.

Further, when the second tank has a discharge port for discharging the liquid stored in the second tank, the liquid stored in the second tank is discharged from the discharge port. No liquid overflows from the second tank.

Further, in the case where the liquid contaminant recovery device is provided with a liquid level adjusting mechanism connected to the outlet for adjusting the liquid level of the second tank, the liquid level adjusting mechanism is used. Since the liquid level of the second tank can be adjusted freely,
An easy-to-use liquid contaminant recovery apparatus can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a schematic structure of an embodiment of a liquid contaminant recovery apparatus.

FIG. 2 is a plan view schematically showing a part of the apparatus for collecting contaminants in liquid of FIG.

FIG. 3 is a schematic view showing a liquid level adjusting mechanism.

[Explanation of symbols]

 Reference Signs List 10 Contaminant recovery device in liquid 12, 18 Coolant liquid 14 Bubbles 20 First tank 24 Plate 30 Second tank 50 Bubble generator 70 Liquid level adjusting mechanism 80 Mesh belt 90 Air ejector

Claims (8)

[Claims] 1. An in-liquid contaminant recovery device for recovering a contaminant from a liquid in which the contaminant is contaminated, comprising: a bubble generator for generating air bubbles in the liquid; An apparatus for recovering contaminants in liquid, comprising: a mesh belt for scooping up bubbles; and an air ejector for ejecting air to the bubbles scooped up by the mesh belt. 2. The apparatus for collecting contaminants in a liquid according to claim 1, wherein the bubble generator generates bubbles at a bottom of the liquid. 3. The endless belt, wherein one end of the mesh belt is located in the liquid and the other end is located above the liquid surface of the liquid, and the mesh belt rotates and scoops up the bubbles. The liquid contaminant recovery device according to claim 1 or 2, wherein 4. A first tank in which the liquid is stored and the bubble generator is installed, and wherein the first tank is arranged adjacent to the first tank and one end of the mesh belt is located. And a second tank in which the liquid in the tank and the bubbles generated in the first tank move sequentially.
4. The apparatus for collecting contaminants in a liquid according to item 2 or 3. 5. The first tank according to claim 4, wherein a plate for preventing a liquid in the first tank from being swirled is formed on a side wall of the first tank. The liquid contaminant recovery device according to the above. 6. A storage tank according to claim 1, further comprising a storage tank for storing a contaminant blown off by air blown from the air blower. Liquid contaminant recovery device. 7. The apparatus for collecting contaminants in a liquid according to claim 4, wherein the second tank is formed with a discharge port for discharging the liquid accumulated in the second tank. . 8. The apparatus for collecting contaminants in a liquid according to claim 7, further comprising a liquid level adjusting mechanism connected to the outlet for adjusting a liquid level of the second tank. .