JPH0985239A - Recovering device for floating oil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optimum floating oil removing device by recovering oil, waste liquor and the like floating on the surface of a liquid into given areas divided by a wall or the like. SOLUTION: In a floating oil recovering device 1 for recovering oil 13, waste liquor and the like floating on the surface of liquid 12 into given areas 10 divided by a wall or the like, a window section 14 for flowing in the upper part of the liquid is formed on a wall 10a, and a weir 15 and a stopper weir 16 to be bonded with the window section are provided, and the weirs are connected together and constituted to be separated from the window section 14 alternately. Then the weir and the stopper weir are floated up to the upper part of the liquid, and an upper edge 16c of the stopper weir is constituted to locate above the liquid level at all times, and a liquid carrying means 20 carrying the liquid 12 from the given area to the outside of the area so that the liquid level difference in which the liquid level height in the given area is lower than the liquid level height outside the area is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating oil recovery device for recovering oil, waste liquid, etc. floating on the surface of a liquid in a predetermined area divided by a wall or the like.

[0002]

2. Description of the Related Art For machine tools such as milling machines and drilling machines, two kinds of oil agents, cutting oil and lubricating oil, are used. Cutting oil reduces the friction between the target metal and the tool such as the cutting blade when cutting metal materials, removes frictional heat to extend the life of the tool and improve the finishing accuracy of products. It is an oil used and is usually water-soluble. Lubricating oil, on the other hand, is used to smooth the relative movement between the solids in contact with each other, and is insoluble in water. The cutting oil is generally stored in an appropriate oil tank, and is supplied to the tool portion by, for example, a pump and then collected again in the oil tank for repeated use.

By the way, due to the structure of the machine, it is impossible to completely prevent the mixing of the cutting oil and the lubricating oil, so that the lubricating oil may be mixed in the oil tank. . Then, as described above, since the cutting oil is water-soluble and the lubricating oil is water-insoluble, the lubricating oil floats on the cutting oil surface and covers the surface due to the difference in specific gravity. If the lubricating oil covers the surface of the cutting oil like that,
The contact between the cutting oil and oxygen in the air is cut off, causing decay, which deteriorates the quality of the cutting oil and adversely affects the cutting accuracy. If cutting chips and metal chips are directly collected in the oil tank, they will usually sink, but if lubricating oil adheres, they will float as they are and will be mixed into the cutting oil supplied to the tool again. There is also a risk that it will end up.

Therefore, it is necessary to remove the lubricating oil floating on the surface of the cutting oil by some means. Therefore, as a device for removing such floating oil, for example, a floating oil removing device (oil skimmer) previously disclosed by the applicant as Utility Model Registration No. 3001673 has been known. This floating oil removing device, as shown in FIG. 8, includes a rotary drive roller 101 and a rotary drive roller 10
1 endless belt 10 wound with sufficient margin
2 and a weight roller 103 suspended from a rotary drive roller 101 via the endless belt 10 on the descending side track of the endless belt 102 fixed to the main body.
2, a gutter-shaped scraper 104 that contacts the front surface 102a and a gutter-shaped scraper 105 that contacts the back surface 102b of the endless belt 102. Then, the rotation driving roller 101 is rotated in a state where the lower portion of the endless belt 102 is immersed in the liquid 107 in which the oil 106 floats on the surface, and the endless belt 102 is driven in the arrow direction. Then, when the endless belt 102 rises from the oil surface, the oil 106 floating on the surface of the liquid 107 is removed from the surface 1 of the endless belt 102.
02a and the back surface 102b are adhered and removed from the surface of the liquid 107, and the oil 106 is scraped off by the scrapers 104 and 105 in the descending side orbit of the endless belt 102.

Although not shown, the lower half of the disc is immersed in a liquid, the disc is rotated, and the oil adhering to the disc surface is scraped above the liquid surface by a scraper. Floating oil removing device, floating oil removing device in which a suction nozzle is arranged in the vicinity of the liquid surface of the liquid on which oil floats, and the suction nozzle absorbs the oil floating near the liquid surface, etc. Is also known.

[0006]

However, in any case, if the oil layer floating on the surface of the liquid is thick, the floating oil can be easily removed and the removal efficiency is also improved. For example, in the case of the floating oil removing device using the endless belt and the floating oil removing device using the disk described in FIG. 8, the thicker the layer of oil floating on the surface of the liquid is, the more the endless belt or The amount of oil that adheres to the disk also increases, and it is easy to collect the oil, and the floating oil can be removed in a short time. On the other hand, if the floating oil layer is thin, the amount of oil that adheres to the endless belt or the disk will be small, and it will take time to collect it. Also, in the case of a floating oil removal device using a suction nozzle, if the oil layer floating on the surface of the liquid is thick, it is possible to easily suck only the oil with the suction nozzle, and conversely, the floating oil If the layer is thin, it becomes easy to absorb the liquid together with the oil, making it difficult to absorb only the oil. Further, when the floating oil layer is thin, it is necessary to accurately install the suction port of the suction nozzle near the liquid surface, which complicates installation of the device.

An object of the present invention is to collect oil, waste liquid, etc. floating on the surface of a liquid in a predetermined area divided by a wall or the like, so that an oil layer most suitable for a floating oil removing apparatus. It is to provide a device that creates a thick environment.

[0008]

In order to solve the above-mentioned problems, the first aspect of the present invention is to collect floating oil for collecting oil floating on the surface of liquid, waste liquid, etc. within a predetermined area. In the device, a weir is provided for partitioning the inside of the predetermined region and the outside of the region in the vicinity of the liquid surface, and a liquid surface difference is set so that the liquid surface height in the predetermined region is lower than the liquid surface height outside the region. In order to form the liquid, liquid supply means for transferring the liquid from inside the predetermined area to outside the area is provided.

According to another aspect of the present invention, there is provided the floating oil recovery apparatus.
And suspending the weir above the liquid,
It is preferable that the upper edge of the weir is always located near the liquid surface.

According to a third aspect of the present invention, there is provided a floating oil recovery device for recovering oil, waste liquid, etc. floating on the surface of a liquid in a predetermined area divided by the wall, wherein the wall is provided. ,
A window that allows liquid in the predetermined region and liquid outside the region to flow in the upper portion of the liquid is provided, and a weir that can adhere to the window outside the predetermined region and the window inside the predetermined region By providing a stopper weir that can be in close contact with the portion and integrally connecting the weir and the stopper weir, when the weir is in close contact with the window portion, the stopper weir separates from the window portion and the stopper When the weir is in close contact with the window, the weir is configured to be separated from the window, and the weir and the stopper weir are floated above the liquid so that the upper edge of the weir is always near the liquid surface. The stopper weir is configured so that the upper edge of the stopper weir is always positioned above the liquid level, and the liquid level difference is set so that the liquid level height in the predetermined area is lower than the liquid level height outside the area. Area to be formed from within the predetermined area Characterized in that a liquid transfer means for transporting the liquid.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a front view showing an internal structure of a recovery device 1 according to an embodiment of the present invention,
It shows a state in which the floating oil removing device 2 using the endless belt 35 is mounted on the collecting device 1. 2 is a left side view of the same apparatus 1, and FIG. 3 is a right side view of the same apparatus 1, both showing a state in which the floating oil removing apparatus 2 is mounted on the collecting apparatus 1 as in FIG. ing.

First, the structure of the recovery device 1 will be described. By supporting the casing 10 having a box shape with an open upper surface by the support columns 11, the recovery device 1 is installed in a state in which the lower half portion of the recovery device 1 is immersed in the liquid 12. The liquid 12 is, for example, an oil agent collected from a machine tool such as a milling machine or a drilling machine, and an oil 13 such as lubricating oil floats on the surface thereof.

A wall body 10a forming the left side surface of the casing 10.
A window portion 14 is provided on the casing 10 and opens from the upper edge of the casing 10 to a height approximately at the center of the casing 10. The installation height of the recovery device 1 is such that the liquid 12 is placed in the middle of the window portion 14.
Is set so that its surface is located. All the other side surfaces (that is, the front and rear surfaces, the right side surface, and the bottom surface of the casing 10) except the left side surface and the upper surface of the casing 10 are closed. Therefore, the liquid 12 inside the casing 10 and the liquid 12 outside the casing 10 can flow in the upper part of the liquid 12 only through the window portion 14.

As shown in FIG. 4, rectangular weirs 15 that can be in close contact with the window 14 outside the casing 10 on both sides of the window 14 and box-shaped stoppers that can be in close contact with the window 14 inside the casing 10. A weir 16 is provided.
The weir 15 and the stopper weir 16 are integrally connected by a connecting member 17 that straddles the window portion 14, and when the weir 15 is in close contact with the window portion 14, the stopper weir 16 is located at a position away from the window portion 14. To the stopper weir 16
When the left side surface 16a of the weir is in close contact with the window portion 14, the weir 15
Is configured to move to a position away from the window.

In the illustrated example, the stopper weir 16 is composed of a hollow box, and the weir 15 and the stopper weir 16 are integrally floated above the liquid 12 by the buoyancy of air sealed inside the stopper weir 16. It keeps the condition. Further, a balance weight 18 is attached to the bottom of the right side surface 16b of the stopper weir 16, and the action of the balance weight 18 allows the weir 15 and the left side surface 1 of the stopper weir 16 to be suspended above the liquid 12.
6a is a wall body 10a that forms the left side surface of the casing 10.
It is designed to always maintain a posture parallel to (both are vertical planes).

By floating above the liquid 12, the upper edge 15a of the weir 15 is always located near the surface of the liquid 12. In addition, weir 15
The lower edge 15b is configured to be located further below the lower edge 14a of the window portion 14. Therefore, when the weir 15 is in close contact with the window portion 14, the liquid 1 in the casing 10
2 and the liquid 12 outside the casing 10 can flow only in the vicinity of the surface of the liquid 12. In addition, the height of the upper edge 15a of the weir 15 is the weir 15 and the stopper weir 16
When the liquid floats above the liquid 12, the upper edge 15a
Is slightly lower than the surface of the liquid 12 (for example, 1 to
It is preferable that the position is about 3 mm lower). Further, the height of the upper edge 15a of the weir 15 is considerably lower than the surface of the liquid 12 under the condition that the layer of the oil 13 is thick, and the height of the liquid 12 is under the condition that the layer of the oil 13 is thin. It may be set to be slightly lower than the surface. In any case, as will be described later, the liquid 12 in the casing 10 and the casing 1
The oil 13 floating on the surface of the liquid 12 when a liquid level difference occurs between the liquid 12 outside 0 flows into the casing 10 having a low liquid level over the upper edge 15a of the weir 15. It is important to set the height as high as possible.

On the other hand, the upper edge 16c of the stopper weir 16 is always positioned above the surface of the liquid 12. Further, the lower edge 16d of the stopper weir 16 is the liquid 1
2 is located above the lower edge 14a of the window portion 14. Therefore, when the stopper weir 16 is in close contact with the window portion 14, the liquid 12 inside the casing 10 and the liquid 12 outside the casing 10 cannot flow near the surface of the liquid 12, and the lower edge 16 of the stopper weir 16 is not able to flow.
It is possible to circulate through the window portion 14 only between d and the lower edge 14a of the window portion 14.

Inside the right side surface of the casing 10, there is provided a liquid feed pipe 20 for carrying the liquid 12 from the inside of the casing 10 to the outside of the casing 10. In the illustrated example, the liquid delivery pipe 20 is configured by a tubular pipe having open ends. A lower end 20a of the liquid delivery pipe 20 opens downward inside the casing 10, and an upper end 20b opens outside the casing 10 above the surface of the liquid 12. Further, above the lower end 20a, an air supply hole 21 for supplying compressed air into the liquid supply pipe 20 is provided at a position lower than the surface of the liquid 12. An air supply means (not shown) is connected to the air supply hole 21.

As will be described later, when compressed air is supplied from the air supply hole 21 into the liquid feed pipe 20, the liquid 12 in the liquid feed pipe 20 is also gathered by the force of the compressed air floating in the liquid feed pipe 20. Ascending, the liquid 12 is discharged from the upper end 20b of the liquid supply pipe 20. Therefore, by continuously supplying the compressed air into the liquid feed pipe 20, the liquid 12
Lower end 2 of the liquid delivery pipe 20 at a position lower than the surface of the
The liquid 12 in the casing 10 can be sucked into the liquid feed pipe 20 via 0a, and the liquid 12 can be discharged to the outside of the casing 10 via the upper end 20b of the liquid feed pipe 20. Thereby, it is possible to form the liquid level difference such that the height of the surface of the liquid 12 inside the casing 10 is lower than the surface height of the liquid 12 outside the casing 10.

The stopper weir 16 and the liquid delivery pipe 20 are also provided.
A partition plate 25 that partitions the inside of the casing 10 between
Is provided. However, the lower edge 25 of this partition plate 25
Since the gap 26 is formed between a and the bottom surface of the casing 10, the liquid 12 in the casing 10 can flow through the gap 26 at the bottom of the casing 10.

Next, the structure of the floating oil removing device 2 mounted on the collecting device 1 will be described. The casing 30 having a box shape with an opened lower surface is the casing 10 of the recovery device 1.
It is installed on top of. Inside the casing 30, there is a motor 32 fixed to a bracket 31, and a drive roller 33 is attached to a drive shaft 33 thereof. The drive roller 34 is rotationally driven in the clockwise direction in FIG. 3 by the operation of the motor 32. The lower end of the endless belt 35, which is wound around the drive roller 34 with a sufficient margin, hangs down from the lower surface of the opened casing 30. The drive roller 34 has ribs 36, 36 on both sides thereof.
Is formed so that the endless belt 35 does not easily come off. Further, fine irregularities are formed on the surface of the drive roller 34 by, for example, knurling,
The friction coefficient with respect to the endless belt 35 is increased to reliably transmit the rotational driving force of the motor 32 to the endless belt 35.

The endless belt 3 wound around the driving roller 34
A weight roller 37 is hung at the lower end of 5. As the name implies, the weight roller 37 has an appropriate weight for performing the function as a weight.
The surface of the weight roller 37 is extremely smooth, unlike the drive roller 34 described above. The weight roller 37 is suspended from the endless belt 35 via the endless belt 35.
To the endless belt 35, the rotation of the driving roller 34 is reliably transmitted to the endless belt 35.
The endless belt 35 is configured to rotate clockwise in FIG.

Ribs 38 are provided on both sides of the weight roller 37.
38 is formed. Appropriate recesses (not shown) are formed in the center of both end surfaces of the weight roller 37.
After the endless belt 35 is hung on the weight roller 37, both ends of the fall prevention member 39 of the weight roller 37 are rotatably locked to these recesses.

Below the endless belt 35 suspending the weight roller 37, the liquid 12 is provided in the region where the stopper weir 16 is arranged inside the casing 10 partitioned by the partition plate 25 of the recovery device 1 described above. It is immersed in. Thus, when the weight roller 37 below the endless belt 35 is immersed in the liquid 12, the endless belt 35 is rotated by the rotation of the drive roller 34, and the oil 13 floating on the surface of the liquid 12 is transferred to the endless belt 35. By adhering to the front surface 35a and the back surface 35b, the liquid 12
The oil 13 floating on the surface of the endless belt 35 is sequentially collected as the endless belt 35 moves around.

In the casing 30, the motor 3
A scraper 40 located on the upper side and a scraper 41 located on the lower side are attached to the bracket 31 fixing the 2 to each other. In the illustrated example, these scrapers 4
Both 0 and 41 are formed in a gutter shape. Then, the scraper 40 located on the upper side comes into contact with the outside of the endless belt 35 and serves to scrape off the oil 13 adhering to the surface 35 a of the endless belt 35 as the endless belt 5 moves (descends). On the other hand, the scraper 41 located on the lower side comes into contact with the inside of the endless belt 35 and serves to scrape off the oil 13 adhering to the back surface 35b of the endless belt 35 as the endless belt 5 circulates (descends). .

The scrapers 40 and 41 shown in FIG.
1, the oil 13 scraped off from the endless belt 35 flows leftward on the scrapers 40 and 41 in FIG. 1 according to this inclination, and then the left end 40a of the scrapers 40 and 41, It is designed to drip downward from 41a. And scraper 4
Below the left ends 40a, 41a of the Nos. 0, 41, there is arranged a receiving gutter 42 for receiving the oil 13 dripping from the scrapers 40, 41 in this way.

In the illustrated example, the receiving trough 42 is inclined downward to the left in FIG. 1 and has a left end 42a.
Goes through the casing 30 through the left side surface and the casing 30
Protruding to the outside. A hose 43 is connected to the left end 42a of the receiving gutter 42. Therefore, the oil 13 scraped from the endless belt 35 flows leftward on the scrapers 40 and 41 in FIG.
1 is dropped from the left end 40a, 41a to the receiving gutter 42.
The oil 13 is then received on the receiving trough 42 in FIG.
At, it flows to the left, enters the hose 43, and is appropriately discharged.

Now, in the recovery apparatus 1 according to the above-described embodiment, when compressed air is not yet supplied into the liquid feed pipe 20, as shown in FIG. 5, the weir 15 and the stopper weir 16 are provided. Neither is in close contact with the window portion 14.
Therefore, the liquid 12 in the casing 10 and the casing 10
The liquid 12 outside is the left side surface of the casing 10 (the wall body 10).
The liquid 12 in the casing 10 and the casing 10 can freely flow through the window portion 14 formed in a).
On the surface of the outer liquid 12, an oil 13 such as a lubricating oil is floated with the same thickness.

Next, compressed air is supplied into the liquid feed pipe 20 to start the operation of the recovery device 1. Then, the liquid 12 in the liquid feed pipe 20 rises together with the force of the compressed air floating in the liquid feed pipe 20, and the liquid 12 in the casing 10 also rises.
Is sucked from the lower end 20a of the liquid feed pipe 20 and continuously discharged from the upper end 20b of the liquid feed pipe 20. As a result, the height of the surface of the liquid 12 inside the casing 10 becomes lower than the surface height of the liquid 12 outside the casing 10, and a liquid level difference occurs between the two. Since the lower end 20a of the liquid delivery pipe 20 is opened downward in the casing 10, the inside of the casing 10 is removed from the casing 10.
Only the liquid 12 is sent to the outside, and the oil 13 floating on the surface of the liquid 12 in the casing 10 is
It is not sent outside.

In this way, when a liquid level difference occurs, the liquid 12 outside the casing 10 is left side surface of the casing 10 (the wall body 10).
Attempts to flow into the casing 10 through the window 14 formed in a). Then, the flow causes the weir 15 to come into close contact with the window 14 from the outside of the casing 10, and the liquid 12 inside the casing 10 and the liquid 12 outside the casing 10 can flow only near the liquid surface. Thus, as shown in FIG. 6, the oil 13 floating on the surface of the liquid 12 outside the casing 10 having a high liquid level is used.
Flows over the upper edge 15a of the weir 15 and flows into the casing 10 having a low liquid level. As a result, the oil 13 is gradually collected in the casing 10 and the liquid 1 in the casing 10 is collected.
The layer of oil 13 floating on the surface of 2 gradually becomes thicker.

In the casing 10 having a thick layer of the oil 13 as described above, the floating oil removing device 2 described above is used.
Is operated, the oil 13 is removed. That is, as shown in FIG. 1, the motor 32 is operated while the lower end of the endless belt 35 suspending the weight roller 37 is immersed in the liquid 12, and the drive roller 34 rotates to move the endless belt 35. It rotates in the clockwise direction in FIG.
As a result, the oil 13 floating on the surface of the liquid 12 in the casing 10 adheres to the front surface 35a and the back surface 35b of the endless belt 35, and the oil 13 is sequentially transferred from the surface of the liquid 12 as the endless belt 35 moves. Collected upwards.

The oil 13 collected above from the surface of the liquid 12 by adhering to the front surface 35a and the back surface 35b of the endless belt 35 is reversed by the drive roller 34, and then scraped on the descending side track of the endless belt 35. Four
0 and the scraper 41 scrape off one by one. Then, the scraped oil 12 is transferred to each scraper 4
After flowing leftward in FIG. 1 on the scrapers 40 and 41 in accordance with the inclination of 0 and 41, they are dripped downward from the left ends 40a and 41a of the scrapers 40 and 41. The dropped oil 13 is received by the receiving gutter 42, and thereafter, the oil 13 flows on the receiving gutter 42 in the left direction in FIG.
It enters inside and is discharged appropriately.

Thus, by using the illustrated recovery device 1, by collecting the oil 13 in the casing 10,
Since the floating oil can be continuously removed by the floating oil removing device 2 with the layer of the oil 13 thick, the removal efficiency can be improved. Note that, after collecting the oil 13 floating on the surface of the liquid outside the casing 10 in the casing 10 and then stopping the supply of compressed air into the liquid feed pipe 20 to stop the liquid feed, it is shown in FIG. Thus, the height of the surface of the liquid 12 inside the casing 10 is the same as the height of the surface of the liquid 12 outside the casing 10. When the liquid 12 in the casing 10 tries to flow out of the casing 10 in this state, the stopper weir 16 comes into close contact with the window portion 14 due to the flow. In this case, the stopper weir 1
Since the upper edge 16c of 6 is located above the liquid surface,
The liquid 12 inside the casing 10 and the liquid 12 outside the casing 10 cannot flow in the vicinity of the surface of the liquid 12, and only through the window 14 between the lower edge 16d of the stopper weir 16 and the lower edge 14a of the window 14. It becomes a state where it can be distributed. Therefore, the illustrated recovery device 1 is provided with the liquid delivery pipe 20.
The oil 13 floating on the surface of the liquid 12 in the casing 10 even after the liquid delivery by the
However, there is a feature that it does not easily flow out of the casing 10.

As described above, according to the illustrated recovery apparatus 1, the oil 13 floating on the surface of the liquid 12 is collected in the casing 10 to create an environment suitable for removing the oil 13. It is possible to improve the collection efficiency. In the illustrated embodiment, an example in which the collecting device of the present invention and the floating oil removing device of the endless belt system are combined has been described, but the collecting device of the present invention is a floating oil removing device of another system, for example, using a disc. It is also applicable to a floating oil removing device using a suction nozzle or a suction nozzle, and the recovery efficiency can be similarly improved in the floating oil removing device.

[0035]

Next, embodiments of the present invention will be described. First, the oil recovery capability of the recovery device constructed according to the present invention was examined. 420 mm x 540 mm (plan area 22
Oil is floated on a water tank of 6,800 mm ² ), and 200 mm × 200 mm (planar area: 40000) in plan view inside the water tank.
A region partitioned by a casing having a size of 0 mm ² ) was formed, and oil was collected inside the casing. As the floating oil, 68,400 cc of Uniway (lubricating oil manufactured by Nippon Oil Co., Ltd., viscosity: 68 cst) was used. Further, compressed air was supplied to the liquid feed pipe at an air pressure of 0.5 kgf / cm ² to feed the liquid from the inside of the casing to the outside of the casing to form a liquid level difference. The inner diameter of the discharge port at the top of the liquid delivery pipe is φ20 mm, and the inner diameter of the air hose is φ5.7 mm.
And the discharge rate is about 3 liters / min.

As a result, 400 cc of oil could be collected in the casing in 10 minutes and 33 seconds. Therefore, it can be seen that the oil recovery capacity of the recovery device manufactured in this example is about 2.3 liters per hour.

Next, it was investigated how changes in the thickness of the floating oil layer affect the performance of the floating oil removing device. Prepare a tank A having a size of 220 mm × 220 mm in a plan view and a tank B having a size of 220 mm × 80 mm in a plan view, and fill the tank A and the tank B with water and oil, respectively, and floating oil The floating oil was removed by the removing device. The floating oil removing device is a system using the endless belt described above with reference to FIG. The oil used is Uniway 68 in consideration of lubricating oil.
(Nippon Oil Co., Ltd. lubricant oil, viscosity: 68 cst)
In consideration of the hydrocarbon cleaning liquid, ACTREL (hydrocarbon cleaning liquid manufactured by Ericsson Chemical Co., Ltd., viscosity: 1.00
7 cst) was used.

First, tanks A and B were each filled with 5 liters of water and 500 cc of Uniway to float oil on the surface of the water. Since the tank A has a larger plane area than the tank B, the floating oil layer formed on the liquid surface in the tank A is thinner than the floating oil layer formed on the liquid surface in the tank B. As a result, A
For the tank, it took 27 minutes and 10 seconds to collect the floating oil.
On the other hand, tank B could collect the floating oil in 15 minutes and 50 seconds.

Next, tanks A and B were filled with 1.5 liters of water and 1140 cc of actrell to float oil on the surface of the water. Since the tank A has a larger plane area than the tank B, the floating oil layer formed on the liquid surface in the tank A is thinner than the floating oil layer formed on the liquid surface in the tank B. As a result, in tank A, it took 66 minutes and 20 seconds to collect the floating oil. On the other hand, in the tank B, the floating oil could be collected in 33 minutes and 40 seconds.

As described above, the tank B having a smaller plane area and a thicker oil layer has a higher efficiency of removing the floating oil, and the tank B can collect the floating oil in about half the time as compared with the tank A. . Therefore,
It has been proved that the recovery device of the present invention collects the oil in a small area and thickens the layer of the floating oil to remove the oil to improve the efficiency.

[0041]

According to the present invention, by collecting the oil floating on the liquid surface in a predetermined area, the oil layer can be thickened, and an environment suitable for removing the oil is created. Will be able to. Therefore, according to the present invention, it is possible to improve the recovery efficiency of the floating oil removing device.
As described in FIG. 7, if the upper edge of the stopper weir is always located above the liquid level,
Even after the operation of the recovery device is stopped, the oil collected in the predetermined area does not easily flow out.

[Brief description of drawings]

FIG. 1 is a front view showing an internal structure of a recovery device according to an embodiment of the present invention.

FIG. 2 is a left side view of the same device.

FIG. 3 is a right side view of the same device.

FIG. 4 is a perspective view of a window portion, a weir, and a stopper weir.

FIG. 5 is an explanatory diagram showing a state before the operation of the recovery device is started.

FIG. 6 is an explanatory diagram showing a state during operation of the recovery device.

FIG. 7 is an explanatory diagram showing a state after the operation of the recovery device is stopped.

FIG. 8 is an explanatory diagram of a floating oil removing device that uses an endless belt.

[Explanation of symbols]

 1 Floating oil recovery device. 2 Floating Oil Removal Device 10 Casing 10a Wall (Left Side of Casing) 12 Liquid 13 Oil 14 Window 15 Weir 16 Stopper Weir 17 Connecting Member 20 Liquid Transfer Pipe

Claims (3)

[Claims] 1. A device for collecting oil, waste liquid, etc. floating on the surface of a liquid in a predetermined region, wherein a weir is provided for partitioning the inside of the predetermined region and the outside of the region in the vicinity of the liquid surface, In order to form a liquid level difference such that the liquid level inside the area is lower than the liquid level outside the area, a liquid feeding means for transporting the liquid from inside the predetermined area to outside the area is provided. Floating oil recovery device. 2. The floating oil recovery apparatus according to claim 1, wherein the weir is floated above the liquid, and the upper edge of the weir is always located near the liquid surface. 3. A method for recovering oil, waste liquid, etc. floating on the surface of a liquid in a predetermined region divided by a wall body, wherein the liquid inside the predetermined region and outside the region are provided on the wall body. A window is provided that allows the liquid to flow in the upper part of the liquid, and a weir that can be in close contact with the window outside the predetermined region and a stopper weir that can be in close contact with the window inside the predetermined region are provided. By integrally connecting the weir and the stopper weir, when the weir is in close contact with the window portion, the stopper weir is separated from the window portion, and when the stopper weir is in close contact with the window portion, The weir is configured to be separated from the window, and the weir and the stopper weir are floated above the liquid, the upper edge of the weir is always located near the liquid surface, and the upper edge of the stopper weir is always the liquid. Configured to be above the plane A liquid feeding means for transporting the liquid from within the predetermined region to outside the region so as to form a liquid level difference such that the liquid level inside the predetermined region is lower than the liquid level outside the region. A floating oil recovery device.