JP7349744B2 - Scum collection device - Google Patents

Description

Applicable to Article 30, Paragraph 2 of the Patent Act Sold to Yushiro Chemical Industry Co., Ltd. Fukuyama Sales Office on November 20, 2020

The present invention relates to a device for recovering scum (foam-like floating scum) mixed into coolant during machining, and in particular, for efficiently separating scum floating on the liquid surface from the coolant. The present invention relates to a scum collection device that can collect scum.

In machining processes such as forging and heading, the surface of the workpiece is subjected to bonding treatment (a process in which a lubricating film is created on the surface of the workpiece using phosphate coating treatment). The lubricating film is peeled off during grinding and mixed into the coolant. A large amount of scum is generated when this lubricating film chemically reacts with sliding surface oil, coolant, etc. Conventionally, the scum generated in the coolant liquid has been manually collected, but this method is inefficient and requires a lot of time and effort to collect the scum.

To address these issues, for example, Patent Document 1 describes a device and method for recovering floating objects such as floating oil and sludge on the liquid surface, which is entitled "Apparatus and method for collecting floating oil and floating sludge." An invention relating to the method is disclosed.
The recovery device disclosed in Patent Document 1 collects mixed liquids such as floating oil (oil with a light specific gravity that floats on water) and sludge (highly viscous dirt that is generated in internal combustion engines such as automobile engines and sticks to the combustion chamber). A storage tank, a flexible hose having an inlet for the mixed liquid and installed in the tank, and two or more floats attached to the flexible hose so that the inlet is located at the liquid level of the tank, A pump case is provided that fixes this float and surrounds the immersion of a low-water submersible pump or coolant pump. It is characterized in that the drop port is provided so as to be held at a position higher than the water level inside the pump case.
According to the recovery device having such a structure, it is possible to efficiently suction oil and sludge floating on the liquid surface by following fluctuations in the liquid level, and moreover, this effect can be achieved using extremely inexpensive equipment. I can do it.

Further, Patent Document 2 discloses a device called a "coolant liquid purification device" for extracting sludge contained in a coolant used for lubricating and cooling machining parts of a machine tool.
The coolant liquid purification device disclosed in Patent Document 2 includes a water tank that stores coolant supplied from the outside and has a cylindrical peripheral wall, and a suction pipe installed in the center of the water tank to suck the coolant. , is equipped with an injection nozzle installed in the water tank that can spray coolant toward the wall surface of the surrounding wall while immersed in the coolant, and the coolant liquid jet jetted from this injection nozzle is directed in the circumferential direction of the surrounding wall. The jet nozzle is characterized in that the jet nozzle is arranged so as to collide with the peripheral wall at an angle such that the jet flows in only one direction along the jet nozzle.
In a coolant liquid purification device with such a structure, the swirling flow of coolant generated in the water tank and the annular vertical convection cause a strong vertical convection in the radial direction of the water tank at the upper and lower parts of the coolant, and the water tank is Sludge that tends to accumulate on the bottom collects in the center. Therefore, sludge and the like can be reliably taken out to the outside through the suction pipe. This eliminates the occurrence of sludge accumulation in the water tank, which saves the effort of taking out sludge and the like, and also eliminates the need to stop the processing machine.

Further, Patent Document 3 discloses a device entitled "Scum removal device for rolling coolant oil tank" in which a trough for collecting scum is installed in the tank.
The scum removal device disclosed in Patent Document 3 includes a trough that is installed in a rolling coolant oil tank and collects scum while floating on the liquid surface, a main float and an auxiliary float fixed to this trough, and a trough that collects scum while floating on the liquid surface. A scum discharge pipe whose one end communicates with the outside of the oil tank and whose other end is connected to the bottom of the trough and can be displaced to follow fluctuations in the liquid level, and a scum discharge pipe that sprays water on the inner surface of the trough to destroy foam-like scum. The scum collection level of the trough can be adjusted, and the auxiliary float can supply and exhaust water.
In a scum removal device with this type of structure, the collection level in the trough automatically follows fluctuations in the liquid level in the coolant tank due to the action of the auxiliary float, making it possible to always perform optimal scum removal. . Furthermore, since the foamy scum collected in the trough is destroyed by water spraying, the scum can be smoothly discharged to the outside of the device.

JP2013-230458A Utility model registration No. 3129588 Utility Model Publication No. 57-148486

In the recovery device disclosed in Patent Document 1, a low water level submersible pump or a coolant pump is operated to lower the water level inside the pump so that the mixed liquid falls through the mixed liquid fall port and flows into the pump case at atmospheric pressure. Since it had to be maintained at a higher position, there was a problem of poor operability. In addition, in the above recovery device, a float is installed on the flexible hose, and even if the liquid level in the tank fluctuates, the mixed liquid inlet of the flexible hose moves up and down to follow the fluctuation. If the liquid level in the tank moves downward and the drop distance between the mixed liquid inlet and the mixed liquid falling port of the flexible hose is no longer secured, the mixed liquid will stop flowing into the mixed liquid inlet. There was an issue. Furthermore, if the immersion interval between the liquid level in the tank and the mixed liquid inlet is outside the range of 1 mm to 5 mm, the effect of air and floating objects flowing into the mixed liquid inlet while creating a swirl along with the mixed liquid will not be sufficiently achieved. There was a problem.
In the coolant liquid purification device disclosed in Patent Document 2, a coolant liquid jet injected from an injection nozzle generates a swirling flow of coolant and an annular vertical convection in a water tank, and this water flow tends to accumulate on the bottom surface of the water tank. Since it acts to collect sludge in the center, it is possible to reliably take out sludge and the like to the outside with the suction pipe. However, the idea disclosed in Patent Document 2 is aimed at preventing the accumulation of sludge in the water tank, and does not have a function to separate the sludge from the coolant, so a filtration device must be installed downstream. There was an issue. In addition, since Patent Document 2 does not have a detailed description of the filtration processing device, its specific structure is unknown.
The scum removal device disclosed in Patent Document 3 has a problem in that workability is poor because it is not easy to adjust the height between the trough and the liquid level in the oil tank. In addition, in the above-mentioned scum removal device, if the liquid level of the coolant is wavy, there is a risk that a large amount of coolant will flow into the trough together with the scum, so it is necessary to efficiently separate the scum from the coolant. The problem was that it was not possible.

The present invention has been made in response to such conventional circumstances, and aims to provide a scum recovery device that can efficiently separate and recover scum floating on the surface of the coolant from the coolant. purpose.

In order to achieve the above object, the first invention is a scum recovery device that separates and recovers scum from a coolant used for lubricating and cooling machining parts in a machine tool, and a coolant tank in which the coolant is stored together with the scum. A float made of a material with a specific gravity smaller than that of the coolant is attached to the float suction installed in the coolant tank so that the scum floating on the coolant surface is floated on the coolant surface so that the scum flows into the inside. a scum separation tank having a scum discharge port, a scum supply port, and a coolant discharge port; and a scum suction pipe having one end connected to the scum supply port of the scum separation tank and the other end connected to the suction port of the float suction. and a pump for sending scum from the float suction to the scum separation tank via the scum suction pipe, and a scum discharge port and a scum supply port are provided at the upper and lower parts of the scum separation tank, respectively, and a coolant discharge port is provided. The outlet is located at a lower position than the scum discharge port.
In the first invention, the scum supplied into the scum separation tank from the scum supply port floats in the coolant and forms a foam layer of a predetermined thickness on the liquid surface of the coolant. It has the effect that scum is difficult to mix with the coolant discharged from the coolant discharge port provided at a lower position. In addition, since only the scum that has reached the height of the scum discharge port overflows from the scum separation tank, the amount of coolant that is discharged from the scum discharge port along with the scum to the outside of the scum separation tank can be kept small. It has this effect.

A second invention is based on the first invention, and is made of a thin plate and is slidable in the vertical direction along the side plate of the scum separation tank provided with the scum discharge port, and the upper end is positioned above the lower surface of the scum discharge port. The present invention is characterized by comprising a shutter installed to be able to protrude into the scum separation tank, and a fixing means for fixing the shutter to the scum separation tank at a desired height.
The surface tension of scum caused by a lubricating film formed on the surface of a workpiece by bonding treatment varies depending on the processing method and processing equipment of the workpiece. In particular, if the lower surface of the scum outlet has a curved surface that has an arc shape when viewed from the side, or if there is a welded layer, the difference in surface tension of the scum will be noticeable, so the scum will There will be a difference in the liquidity of As a result, it becomes difficult to smoothly discharge the scum from the scum discharge port. On the other hand, in the second invention, in addition to the effect of the first invention, since the difference in the surface tension of the scum is difficult to appear at the upper end of the shutter made of a thin plate, the fluidity of the scum is different due to the influence of the surface tension. This has the effect of alleviating the above-mentioned problem that occurs. Further, since only scum exceeding the upper end of the shutter is discharged from the scum discharge port, the shutter has the effect of regulating the level (height) of scum that can be discharged from the scum discharge port.

A third invention is based on the first invention or the second invention, and includes an overflow pipe whose one end is connected to the coolant discharge port of the scum separation tank, and a length adjustment means for changing the length of the overflow pipe. The other end of the overflow pipe is arranged at a position lower or higher than the lowest point on the inner surface of the scum discharge port by operating the length adjusting means.
In the third invention, when the liquid level of the coolant stored in the scum separation tank reaches a predetermined height in the overflow pipe, the coolant starts overflowing from the open end. As a result, the liquid level of the coolant in the scum separation tank is maintained at the predetermined height in the overflow pipe. Therefore, in the third invention, in addition to the effects of the first invention or the second invention, by operating the length adjusting means, the liquid level of the coolant in the scum separation tank is adjusted to the highest point on the inner surface of the scum discharge port. It has the effect of becoming higher or lower than a low point.

A fourth invention is a suction cup according to any one of the first to third inventions, wherein at least the upper part is cylindrical, and the suction cup is provided at the lower part so as to be connected to the opening in the upper part; A shutter ring is formed in a cylindrical shape and is fitted onto the upper part of the suction cup so that the cylinder axes thereof coincide with each other and are rotatable around the cylinder axis. It is characterized in that each cutout is provided with a desired depth in a direction parallel to the cylindrical axis and a desired width in the circumferential direction.
In the fourth invention, in addition to the effects of any one of the first to third inventions, when the shutter ring is viewed from the side, the overlapping portion of the notch of the suction cup and the notch of the shutter ring passes through the When scum flows into the suction cup and the shutter ring is rotated about the cylindrical axis with respect to the suction cup, the size of the overlapping portion changes and the amount of scum flowing into the suction cup changes. It has the effect of changing. In addition, by moving the shutter ring parallel to the cylinder axis direction relative to the suction cup, the height of the lower surface of the overlapping part becomes higher or lower than the coolant level in the coolant tank. has.

A fifth invention is based on the fourth invention, and includes, in place of the shutter ring, a cylindrical body inserted into the suction cup, and a floating aid attached to the cylindrical body and made of a member having a specific gravity smaller than that of the coolant. The cylindrical body is characterized in that the upper end of the cylindrical body is disposed so as to be movable in the vertical direction with respect to the suction cup so that the upper end thereof can protrude above the notch of the suction cup.
In the fifth invention, when the coolant flows into the suction cup and accumulates therein, buoyancy is generated in the floating aid, so that the cylindrical body moves upward in the suction cup together with the floating aid. The amount of movement of this cylindrical body is determined by the magnitude of the buoyant force generated in the floating aid, and is therefore influenced by the amount of coolant accumulated in the suction cup. That is, in the fifth invention, the length by which the upper end of the cylindrical body projects above the notch of the suction cup changes depending on the amount of coolant accumulated in the suction cup.

A sixth invention is the rotary joint according to the fourth invention or the fifth invention, wherein the suction port of the float suction is provided on the lower side surface of the suction cup, and the rotary joint is installed on the suction cup so that the rotation axis is perpendicular to the cylindrical axis. The other end of the scum suction pipe is connected to the suction port through the scum suction pipe.
The float suction, which is floating in the coolant in the coolant tank, descends as the coolant level drops, but if the suction port of the float suction is provided at the bottom of the suction cup, it will not connect to the suction port. The scum suction tube becomes an obstacle when the float suction descends. Additionally, when a part of the scum suction pipe comes into contact with the bottom of the coolant tank as the float suction descends, the force acting on the scum suction pipe from the coolant tank is transmitted to the suction cup via the scum suction pipe, causing the suction to drop. There is a risk that the cup will tilt and a large amount of coolant will flow into the suction cup. On the other hand, in the sixth invention, in addition to the suction port of the float suction being provided on the lower side surface of the suction cup, the point connected to the suction port of the scum suction pipe is centered around the rotation axis of the rotary joint. Therefore, in addition to the effect of the fourth invention or the fifth invention, the scum suction pipe connected to the suction port does not become an obstacle when the float suction descends. In addition, because the part connected to the suction port of the scum suction pipe rotates around the rotation axis of the rotary joint, even if the float suction descends and a part of the scum suction pipe comes into contact with the bottom of the coolant tank, Since the force that the scum suction pipe receives from the bottom of the coolant tank is small, it is unlikely that the suction cup will tilt due to that force.

A seventh invention is the invention according to any one of the first invention to the sixth invention, which includes a scum introduction pipe whose one end is connected to the scum supply port, and this scum introduction pipe has a scum discharge port in the scum separation tank. It is characterized in that it is installed in the scum separation tank with the other end facing the location opposite to the location where the scum separation tank is provided.
In the seventh aspect of the invention, the scum supplied from the scum supply port into the scum separation tank is discharged to a location away from the scum discharge port by the scum introduction pipe, so that the scum produced by the scum supplied to the scum separation tank is Fluctuations in the coolant level near the discharge port are unlikely to occur. Therefore, in the seventh invention, the effect of the first invention is more reliably exerted in that the amount of coolant discharged from the scum discharge port to the outside of the scum separation tank along with the scum is suppressed to a small amount. Further, the scum newly discharged from the scum introduction pipe at a location opposite to the location where the scum discharge port is provided acts to push up the already discharged scum from below and push it toward the scum discharge port. This prevents the scum from solidifying as it stagnates, and the scum becomes dense near the scum discharge port, increasing the amount of scum discharged from the scum discharge port per unit time. The amount of coolant discharged from the scum outlet together with the scum is reduced. Furthermore, since the range in which scum is discharged from the scum introduction pipe is limited, the effect of the first invention that scum is difficult to mix with the coolant discharged from the coolant discharge port is further exhibited.

In the first invention, since the coolant is difficult to be discharged when the scum is discharged from the scum discharge port, and the scum is difficult to be discharged when the coolant is discharged from the coolant discharge port, the scum is separated from the coolant. The proportion of Therefore, according to the first invention, it is possible to efficiently separate and recover the scum from the coolant.

According to the second invention, by operating the shutter to finely adjust the level (height) of scum that can be discharged from the scum discharge port, it is possible to prevent coolant from being discharged from the scum discharge port. In addition, even if the lower surface of the scum outlet is machined with a curved surface that has an arc shape when viewed from the side, or if there is a welded layer, differences in scum fluidity occur due to the influence of surface tension. Since it is difficult to generate scum, the effect of the first invention of being able to efficiently separate and recover scum from the coolant is similarly exhibited.

When the liquid level of the coolant in the scum separation tank becomes higher than the lowest point on the inner surface of the scum discharge port, the coolant is discharged together with the scum from the scum discharge port. However, in the third invention, the liquid level of the coolant in the scum separation tank is made lower than the lowest point on the inner surface of the scum discharge port by changing the length of the overflow pipe by operating the length adjustment means. be able to. In this case, there is no risk of coolant being discharged from the scum discharge port. That is, according to the third invention, in addition to the effects of the first invention or the second invention, the liquid level of the coolant can be finely adjusted, thereby preventing the discharge of coolant from the scum discharge port and separating the scum from the scum. This has the effect of efficiently discharging water from the tank.

According to the fourth invention, in addition to the effects of any one of the first to third inventions, by rotating the shutter ring about the cylindrical axis with respect to the suction cup, the flow into the suction cup is This has the effect of being able to adjust the amount of scum. Additionally, if the liquid level of the coolant in the coolant tank becomes higher than the bottom surface of the overlapping area between the notch of the suction cup and the notch of the shutter ring, the amount of coolant flowing into the suction cup through the overlapping area will be significantly increased. However, according to the fourth invention, the shutter ring is moved parallel to the cylinder axis direction with respect to the suction cup, and the height of the lower surface of the overlapping portion is adjusted to the level of the coolant in the coolant tank. By setting the height higher than that, it is possible to suppress the coolant from flowing into the suction cup. Furthermore, by appropriately controlling the amount of scum flowing into the suction cup, it is possible to minimize the pump's discharge capacity. This increases the residence time of scum in the scum separation tank, thereby increasing the scum separation capacity.

When the liquid level of the coolant in the coolant tank becomes higher than the lower surface of the notch in the suction cup, the amount of coolant flowing into the suction cup through the notch increases significantly. If the upper end of the cylinder protrudes above the notch in the suction cup, the amount of coolant flowing into the suction cup will be significantly reduced unless the coolant level in the coolant tank exceeds the upper end of the cylinder. will not increase. As already mentioned, the length by which the upper end of the cylindrical body projects above the notch of the suction cup changes depending on the amount of coolant stored in the suction cup. That is, according to the fifth invention, in addition to the effect of the fourth invention, when the amount of coolant flowing into the suction cup increases, the upper end of the cylindrical body protrudes above the lower surface of the notch of the suction cup. Therefore, there is an effect that the flow of coolant into the suction cup is suppressed.

According to the sixth invention, in addition to the effects of the fourth invention or the fifth invention, since the scum suction pipe does not become an obstacle when the float suction is lowered, the liquid level of the coolant in the coolant tank is lowered to the lower level of the float suction. The effect is that the float suction can function even when the suction port is lowered to a lower position than when it is provided on the bottom of the suction cup. Further, even when the float suction is lowered, the suction cup is tilted due to the force exerted on the scum suction pipe from the coolant tank, thereby preventing a large amount of coolant from flowing into the suction cup.

According to the seventh invention, in addition to the fact that the liquid level of the coolant does not easily fluctuate in the vicinity of the scum discharge port when scum is supplied to the scum separation tank, the amount of scum discharged from the scum discharge port per unit time is As the ratio increases, the amount of coolant discharged from the scum outlet along with the scum becomes smaller. Furthermore, in addition to the fluidity of the scum being less likely to deteriorate, the scum is less likely to mix with the coolant discharged from the coolant outlet, so the scum can be efficiently separated from the coolant and recovered. The effect is even more effective.

(a) is a schematic diagram of the scum collection device according to the first embodiment of the present invention, and (b) is an external view of the scum overflow level adjustment mechanism in (a) of the same figure. (a) is an external perspective view of the scum separation tank shown in FIG. 1(a), and (b) is a schematic diagram of the scum separation tank shown in FIG. 1(a). (a) is an external perspective view of the overflow shutter mechanism, (b) and (c) are external perspective views of the shutter and fixture, respectively, and (d) and (e) are the same as shown in (b) of the same figure. FIG. 7 is a front view of a shutter according to a modified example of the shutter. (a) is a side view of the scum separation tank in which the periphery of the scum discharge port is enlarged in FIG. 2(a), and (b) is a sectional view taken along the line AA in FIG. 2(a). (a) is a schematic diagram of a floating oil recovery device according to the prior art, and (b) is an external view of the floating oil overflow level adjustment mechanism in (a) of the same figure. (a) and (b) are a plan view and a side view of the float suction shown in FIG. 1 (a), respectively, and (c) is the amount of scum inflow in the float suction shown in FIG. It is an external perspective view of an adjustment mechanism, and (d) and (e) are external appearance perspective views of the shutter ring and suction cup shown in the same figure (c), respectively. (a) is a sectional view taken along the line CC in FIG. 6(c), and (b) is a diagram showing a state in which the shutter ring has moved upward with respect to the suction cup in FIG. 6(a). be. (a) and (b) are diagrams schematically showing how scum flows into the suction cup in FIGS. 7(a) and 7(b). 6(a) is a view taken in the direction of arrow D in FIG. 6(c), and FIG. 6(b) is a diagram showing a state in which the shutter ring has moved in the circumferential direction with respect to the suction cup in FIG. 6(a). (a) and (b) are a plan view and a side view of a modified example of the float suction shown in FIGS. 6(a) and 6(b), respectively, and (c) is a FIG. 3B is a perspective view of the external appearance of the suction cup shown in FIG. (a) is a plan view showing a state in which the scum suction pipe is connected to the float suction using a rotary joint in FIG. be. (a) and (b) are a sectional view taken along the line GG in FIG. 11(a) and a view taken in the direction H in FIG. 11(b), respectively. (a) is a diagram showing a state in which the scum suction pipe is directly connected to the float suction in FIG. 10(b), and (b) is a diagram showing a state in which the scum suction pipe is rotated in FIG. 12(b). This is a diagram. (a) is an external perspective view of a scum inflow amount adjustment mechanism to a float suction in a scum collection device according to a second embodiment of the present invention, and (b) to (d) are shown in FIG. FIG. 4 is an external perspective view of a suction cup, a float shutter, and a flotation aid that constitute a float suction, and (e) and (f) are respectively a sectional view taken along the line J-J in FIG. ) is a sectional view taken along line KK. 14(a) is a sectional view taken along the line II in FIG. 14(a), and FIG. 14(b) shows a state in which the float shutter and the floating aid have moved upward relative to the suction cup in FIG. 14(a). FIG.

The scum collection device of the present invention will be specifically explained using FIGS. 1 to 15. In addition, in the following explanation, it is assumed that the scum collection device is actually used, that is, the scum separation tank and coolant tank are placed in a horizontal place. Expressions such as "upper end" and "lower end" are used.

FIG. 1(a) is a diagram schematically showing the configuration of the scum collection device according to the first embodiment of the present invention, and FIG. 1(b) is a diagram showing the scum overflow level adjustment mechanism in FIG. 1(a). It is a diagram showing the appearance. In addition, in FIG. 1(a), the illustration of the scum in the scum separation tank is omitted, and the position of the coolant level in the scum separation tank is indicated by a broken line X.
FIG. 2(a) is a perspective view showing the appearance of the scum separation tank in FIG. 1(a), and FIG. 2(b) schematically shows the structure of the scum separation tank shown in FIG. 1(a). It is a diagram. Note that in FIG. 2(b), illustration of the bolt shown in FIG. 2(a) is omitted. Moreover, the solid line arrow B shown in FIG. 2(b) schematically represents the flow of scum supplied to the scum separation tank 2 from the scum introduction pipe 7b.
FIG. 3(a) is an external perspective view of the overflow shutter mechanism, and FIGS. 3(b) and 3(c) are external perspective views of the shutter and the fixture, respectively. Moreover, FIG.3(d) and FIG.3(e) are front views of the shutter based on the modification of the shutter shown in FIG.3(b). FIG. 4(a) is a side view of the scum separation tank in which the periphery of the scum discharge port is enlarged in FIG. 2(a), and FIG. 4(b) is a cross-sectional view taken along the line AA in FIG. be. Note that illustration of bolts is omitted in FIG. 4(a).

As shown in FIG. 1(a), the scum recovery device 1 of the present invention includes a scum separation tank 2 in which a scum discharge port 2a is provided at the top, and a scum supply port 2b and a coolant discharge port 2c are provided at the bottom. The scum overflow level adjustment mechanism 3 connected to the coolant discharge port 2c, the coolant tank 5 in which the coolant 11b is stored together with the scum 11a, and the coolant so that the scum 11a floating on the liquid surface of the coolant 11b flows into the inside. A float suction 6 installed inside the coolant tank 5 so as to float on the liquid surface of the scum separation tank 11b, an overflow shutter mechanism 4 installed at the scum discharge port 2a of the scum separation tank 2, and a scum supply to the scum separation tank 2. One end is connected to the port 2b, and the other end is connected to the suction port 6a of the float suction 6, and includes a scum suction pipe 7a made of a flexible hose that is easily deformed in addition to a metal or plastic hose. A filter 8 and an air-driven diaphragm pump 9 are installed in this scum suction pipe 7a. Although not an essential component of the scum collection device 1, a scum tank 10 for storing the scum 11a discharged from the scum separation tank 2 is installed below the scum discharge port 2a. Note that the coolant discharge port 2c does not necessarily have to be provided at the lower part of the scum separation tank 2, but it is necessary that it is provided at least at a lower position than the scum discharge port 2a.

In the scum collection device 1 having the above structure, a part of the scum 11a floating on the liquid surface of the coolant 11b stored in the coolant tank 5 is collected by the float suction 6, and is passed through the scum suction pipe 7a. The scum is supplied to the scum separation tank 2 from the scum supply port 2b by the action of the air-driven diaphragm pump 9 installed therein. Note that since it is difficult to collect only the scum 11a by the float suction 6, when the scum 11a is supplied from the coolant tank 5 to the scum separation tank 2, a part of the coolant 11b is also supplied to the scum separation tank 2. However, as will be described later, the float suction 6 has a structure in which the amount of the coolant 11b supplied to the scum separation tank 2 together with the scum 11a is kept small.
Of the scum 11a and coolant 11b supplied from the coolant tank 5 to the scum separation tank 2, the scum 11a floats in the liquid of the coolant 11b and forms a layer of foam with a predetermined thickness on the liquid surface of the coolant 11b. . On the other hand, the coolant 11b is discharged from the coolant discharge port 2c to the outside of the scum separation tank 2, but since the coolant discharge port 2c is provided at a lower position than the scum discharge port 2a, the coolant 11b is discharged from the coolant discharge port 2c. The scum 11a is difficult to mix with the coolant 11b that is discharged. In addition, in the scum collection device 1, among the scum 11a floating on the liquid surface of the coolant 11b, only the scum 11a that has reached the height of the scum discharge port 2a overflows from the scum separation tank 2 and is stored in the scum tank 10. Since the coolant 11b is configured so as to be discharged from the scum discharge port 2a together with the scum 11a, the amount of the coolant 11b can be suppressed to be small. Note that the coolant 11b discharged from the coolant discharge port 2c to the outside of the scum separation tank 2 is returned to the coolant tank 5.
In this way, in the scum recovery device 1, the coolant 11b is not easily discharged when the scum 11a is discharged from the scum discharge port 2a, and the scum 11a is not easily discharged when the coolant 11b is discharged from the coolant discharge port 2c. Therefore, the ratio of the scum 11a separated from the coolant 11b can be increased. Therefore, according to the scum recovery device 1, it is possible to efficiently separate and recover the scum 11a from the coolant 11b.

As shown in FIG. 1(b), the scum overflow level adjustment mechanism 3 includes a coolant discharge pipe 12a, one end of which is connected to the coolant discharge port 2c of the scum separation tank 2, and a nut 13a provided at the other end. It includes a coolant discharge pipe 12b provided with a nut 13b, and a cylindrical joint 14 that connects the coolant discharge pipes 12a and 12b. The ends of the coolant discharge pipes 12a, 12b protrude beyond the nuts 13a, 13b, and the nuts 13a, 13b, which are closed at one end, have an opening on the protruding end side of the coolant discharge pipes 12a, 12b. They are attached to the outer circumferential surfaces of the coolant discharge pipes 12a and 12b so that their cylindrical axes are aligned with each other when the pipes are facing toward each other. The joint 14 has male threaded parts 14a, 14a on its outer peripheral surface that are screwed into the female threaded parts of the nuts 13a, 13b. It has a structure that can be screwed into each nut 13b.
When the joint 14 is rotated in one direction with both ends of the male screw parts 14a and 14a screwed in between the coolant discharge pipe 12a and the nut 13a and between the coolant discharge pipe 12b and the nut 13b, the coolant discharge pipe 12a and nut 13a, coolant discharge pipe 12b and nut 13b simultaneously move away from joint 14, and when joint 14 is rotated in the other direction, coolant discharge pipe 12a and nut 13a, coolant discharge pipe 12b and nut 13b are formed in a direction that simultaneously moves toward the joint 14.
Furthermore, seal packings 15 are installed inside the nuts 13a and 13b so as to be inserted into the coolant discharge pipes 12a and 12b, respectively.
Further, a coolant discharge pipe 12c is connected to the upper end of the coolant discharge pipe 12b (the end not connected to the joint 14) via a connector 16. Note that the coolant discharge pipe 12a rises vertically from the vicinity of the coolant discharge port 2c so as to be parallel to the vertical direction, and the coolant discharge pipe 12b connected to the coolant discharge pipe 12a via the joint 14 is also parallel to the vertical direction. ing. The L-shaped coolant discharge pipe 12c has its base end connected to the connector 16 with its open end facing downward.

The scum overflow level adjustment mechanism 3 is configured such that the coolant discharge pipe 12b is movable in the vertical direction, and by moving the coolant discharge pipe 12b in the vertical direction, the height of the lowest point of the inner surface of the coolant discharge pipe 12c is The structure is such that the relationship between the height and the lower surface (lowest part of the inner surface) of the scum discharge port 2a of the scum separation tank 2 changes. In addition, since the coolant 11b exceeding the lowest point on the inner surface of the coolant discharge pipe 12c is discharged from the open end of the coolant discharge pipe 12b, the above-mentioned lowest point on the inner surface of the coolant discharge pipe 12c is located in the scum separation tank 2. This corresponds to the height of the liquid level of the coolant 11b (broken line X shown in FIG. 1(a)) stored in the coolant 11b. That is, in the scum overflow level adjustment mechanism 3, the coolant discharge pipes 12a to 12c constitute an overflow pipe, and the joint 14 has a length that changes the length of the overflow pipe by moving the coolant discharge pipe 12b in the vertical direction by rotation. It constitutes the adjustment means. The scum overflow level adjustment mechanism 3 has a function of changing the liquid level of the coolant 11b stored in the scum separation tank 2 by adjusting the length of the overflow pipe.
If the liquid level of the coolant 11b in the scum separation tank 2 becomes higher than the lowest point on the inner surface of the scum discharge port 2a, there is a risk that the coolant 11b will be discharged from the scum discharge port 2a together with the scum 11a. 1, by rotating the joint 14 and changing the length of the overflow pipe consisting of the coolant discharge pipes 12a to 12c, the liquid level of the coolant 11b in the scum separation tank 2 is lowered from the lowest point on the inner surface of the scum discharge port 2a. can also be lowered. This prevents the coolant 11b from being discharged from the scum discharge port 2a. That is, according to the scum collection device 1, the liquid level of the coolant 11b can be finely adjusted by a simple operation of the scum overflow level adjustment mechanism 3, so that the scum 11a is prevented from being discharged from the scum discharge port 2a. It is possible to efficiently discharge the scum from the scum separation tank 2.

As shown in FIGS. 2(a) and 2(b), the scum separation tank 2 has a substantially rectangular parallelepiped shape with an open top, and a rectangular opening 17a provided at the upper end of the side plate 2d (see FIG. 2(b)). ) and an enclosure 17b (see FIG. 2(b)) extending obliquely downward from the edge of the opening 17a, forming the scum discharge port 2a.
A pair of side plates 2e, 2e perpendicular to the side plate 2d are each provided with two insertion holes 2h (see FIG. 4(a)) for bolts 18 for fixing the overflow shutter mechanism 4. Further, the scum introduction pipe 7b, whose lower end is connected to the scum supply port 2b provided on the bottom plate 2g, is installed inside the scum separation tank 2 with its upper end facing the side plate 2f parallel to the side plate 2d. . That is, the scum introduction pipe 7b discharges the scum 11a supplied from the float suction 6 via the scum suction pipe 7a and the scum supply port 2b to the upper part of the side plate 2f opposite to the side plate 2d provided with the scum discharge port 2a. It has a function.
In this way, in the scum collection device 1, the scum 11a supplied to the scum separation tank 2 from the scum supply port 2b is discharged to a location away from the scum discharge port 2a by the scum introduction pipe 7b, A situation in which the liquid level of the coolant 11b fluctuates in the vicinity of the scum discharge port 2a is unlikely to occur due to the influence of the supplied scum 11a. Thereby, the effect of suppressing the amount of coolant 11b discharged from the scum discharge port 2a to the outside of the scum separation tank 2 together with the scum 11a is more reliably exerted. In addition, the scum 11a newly discharged from the scum introduction pipe 7b at a location opposite to the location where the scum discharge port 2a is provided is lower than the already discharged scum 11a, as shown by arrow B in FIG. 2(b). The scum acts to push up from the scum discharge port 2a and push it toward the scum discharge port 2a. The scum 11a has a property of being solidified by a chemical reaction when it remains inside the scum separation tank 2 for a long time. Since the solidified scum 11a has poor fluidity, it becomes difficult to be discharged from the scum discharge port 2a. However, in the scum recovery device 1, as described above, the scum 11a discharged from the scum introduction pipe 7b acts to forcibly move the scum 11a floating on the liquid surface of the coolant 11b to the scum discharge port 2a. This prevents the scum 11a from solidifying, and the scum 11a becomes dense near the scum discharge port 2a, increasing the amount of scum 11a discharged from the scum discharge port 2a per unit time. On the other hand, the amount of coolant 11b discharged from the scum discharge port 2a together with the scum 11a decreases. Furthermore, since the range in which the scum 11a is discharged from the scum introduction pipe 7b is limited, the above-mentioned effect that the scum 11a is difficult to mix with the coolant 11b discharged from the coolant discharge port 2c is further exhibited.

As shown in FIGS. 3A to 3C, the overflow shutter mechanism 4 includes a shutter 19 made of a thin plate with a thickness of about 0.5 mm, and a fixture 20 made of an elongated plate.
The shutter 19 is formed by bending both sides of a thin plate at right angles in the same direction to form a pair of mounting parts 19a, 19a which are rectangular in plan view and parallel to each other, and a flat plate part 19b which is substantially rectangular in plan view. ing. The mounting portion 19a has a pair of elongated holes 19c, 19c through which the bolt 18 can be inserted, which are elongated in parallel with the longitudinal direction, and the flat plate portion 19b is formed such that the upper end 19d forms a V-shape in plan view. .
The fixture 20 is formed by bending both ends of an elongated plate at right angles in the same direction to form a pair of bent portions 20a, 20a that are parallel to each other, and a connecting portion 20b that connects the pair of bent portions 20a, 20a. The pair of bent portions 20a, 20a are connected to each other by a reinforcing portion 20c parallel to the connecting portion 20b. Further, a pair of bolt holes 20d, 20d into which the bolts 18 are screwed are formed in the bent portions 20a, 20a. Further, the distance between the outer surfaces of the pair of bent portions 20a, 20a is shorter than the distance between the inner surfaces of the pair of attachment portions 19a, 19a, and the fixture 20 has the pair of bent portions 20a, 20a attached to the pair of attachment portions 19a, 19a. It has a structure that allows it to be placed between the pair of attachment parts 19a, 19a in a parallel state (see FIG. 3(a)). The pair of bolt holes 20d, 20d are located at locations where the two bolts 18 inserted into the pair of elongated holes 19c, 19c, respectively, can be screwed in at the same time when the fixture 20 is placed inside the shutter 19. It is formed.
Note that the shutter 19 is not limited to the structure shown in FIGS. 3(a) and 3(b). For example, the shutter 19 may have a structure in which the upper end 19d is arcuate or linear as shown in FIGS. 3(d) and 3(e) when the flat plate portion 19b is viewed from above.

In the shutter 19, the distance between the outer surfaces of the pair of mounting parts 19a, 19a is shorter than the distance between the inner surfaces of the pair of side plates 2e, 2e of the scum separation tank 2, As shown, the shutter 19 has a structure that can be placed between a pair of side plates 2e, 2e. Therefore, when the bolt 18 inserted into the elongated hole 19c and screwed into the bolt hole 20d of the fixture 20 is tightened, the mounting part 19a is secured from both sides by the bent part 20a of the fixture 20 and the side plate 2e of the scum separation tank 2. It is held in place by being pinched. In this way, the shutter 19 is fixed to the scum separation tank 2 using the bolts 18 and fixtures 20, but at this time, the flat plate part 19b of the shutter 19 comes into contact with the inner surface of the side plate 2d of the scum separation tank 2. An insertion hole 2h for the bolt 18 is provided in the side plate 2e of the scum separation tank 2 so that the scum separation tank 2 is in the same state. Then, in the state shown in FIG. 4(b), when the bolt 18 is loosened, the shutter 19 becomes movable in the vertical direction within the range that the bolt 18 can move inside the elongated hole 19c, and the shutter 19 is moved to the highest position. As a result, the upper end 19d protrudes from the lower surface of the scum discharge port 2a. That is, the shutter 19 is installed so that it can slide vertically along the side plate 2d, and the upper end 19d can protrude above the lower surface of the scum discharge port 2a. At this time, the bolt 18 and fixture 20 function as a fixing means for fixing the shutter 19 to the scum separation tank 2 at a desired height.

When the scum 11a is caused by a lubricating film formed on the surface of the workpiece by bonding, the surface tension varies depending on the processing method and processing equipment of the workpiece. In particular, when the lower surface of the scum discharge port 2a is machined with a curved surface that has an arc shape when viewed from the side or when a welded layer is present, the difference in surface tension of the scum 11a becomes noticeable. There is a difference in the fluidity of the scum 11a between the weld layer and the weld layer. As a result, it becomes difficult to smoothly discharge the scum 11a to the outside of the scum separation tank 2 from the scum discharge port 2a. On the other hand, in the scum collection device 1 equipped with the overflow shutter mechanism 4, the difference in the surface force of the scum 11a is difficult to show at the upper end 19d of the shutter 19 made of a thin plate, so the fluidity of the scum 11a is affected by the influence of surface tension. The phenomenon of differences is unlikely to occur.
Further, since only the scum 11a exceeding the upper end 19d of the shutter 19 is discharged from the scum discharge port 2a, the level (height) of the scum 11a that can be discharged from the scum discharge port 2a is defined by the shutter 19.
In this way, in the scum collection device 1, by operating the shutter 19 and finely adjusting the level (height) of the scum 11a that can be discharged from the scum discharge port 2a, the coolant 11b can be discharged from the scum discharge port 2a. It can be prevented. In addition, according to the scum collection device 1, even if the lower surface of the scum discharge port 2a is processed with a curved surface portion having an arc shape in side view or a weld layer portion is present, the fluidity of the scum 11a is not affected. Since a difference is unlikely to occur, it is possible to smoothly discharge the scum 11a to the outside of the scum separation tank 2 from the scum discharge port 2a.

Here, a device for recovering oil (floating oil) that has entered the coolant and floated to the surface of the coolant will be described with reference to FIG. Note that FIG. 5(a) is a schematic diagram of a floating oil recovery device according to the prior art, and FIG. 5(b) is an external view of the floating oil overflow level adjustment mechanism in FIG. 5(a).
As shown in FIG. 5(a), the floating oil recovery device 50 is provided with a floating oil outlet 51a to which a floating oil discharge pipe 52a is connected, a coolant outlet 51c to which a coolant discharge pipe 52c is connected, and , a floating oil separation tank 51 is provided in a bottom plate 51d with a floating oil supply port 51b to which the lower end of a floating oil introduction pipe 52d installed parallel to the vertical direction is connected. A partition plate 51e is installed in the floating oil separation tank 51 to separate a primary tank provided with a floating oil outlet 51a and a secondary tank provided with a coolant outlet 51c. A floating oil overflow level adjustment mechanism 53 is connected to the other end of the floating oil discharge pipe 52b to which one end is connected.
As shown in FIG. 5(b), the floating oil overflow level adjustment mechanism 53 includes a floating oil discharge pipe 52b provided with a male threaded portion 54a at the upper end, and a female threaded portion 54b screwed into the male threaded portion 54a. It consists of a cylindrical adjustment socket 55 formed on the circumferential surface. Note that the floating oil discharge pipe 52b is installed inside the floating oil separation tank 51 so that the cylindrical axis of the adjustment socket 55 is parallel to the vertical direction.

In the floating oil recovery device 50 having the above structure, among the floating oil 11c and coolant 11b supplied into the floating oil separation tank 51 from the floating oil supply port 51b through the floating oil introduction pipe 52d, the floating oil 11c is floats in the coolant 11b in the primary tank and then accumulates on the liquid surface of the coolant 11b, while a part of the coolant 11b passes under the partition plate 51e and flows from the primary tank to the secondary tank. Moving. Of the floating oil 11c that has accumulated on the liquid surface of the coolant 11b in the primary tank, the floating oil 11c that has flowed into the adjustment socket 55 passes from the floating oil outlet 51a through the floating oil discharge pipe 52a to the floating oil separation tank. It is discharged to the outside of 51. Note that when the liquid level of the coolant 11b exceeds the height of the upper end 55a of the adjusting socket 55, the coolant 11b flows into the adjusting socket 55 until the liquid level matches the height of the upper end 55a of the adjusting socket 55. The coolant 11b that has flowed into the adjustment socket 55 is discharged to the outside of the floating oil separation tank 51 via the floating oil discharge pipe 52b, the floating oil discharge port 51a, and the floating oil discharge pipe 52a. In this way, in the floating oil separation tank 51, the liquid level of the coolant 11b is maintained at the height of the upper end 55a of the adjusting socket 55, but the female threaded portion 54b of the adjusting socket 55 and the male threaded portion 54a of the floating oil discharge pipe 52b are are screwed together, so when the adjustment socket 55 is rotated, the height of the upper end 55a changes. That is, in the floating oil overflow level adjustment mechanism 53, the height of the coolant 11b inside the floating oil separation tank 51 can be adjusted by rotating the adjustment socket 55 and changing the height of the upper end 55a. It has become. Note that when the liquid level of the coolant 11b exceeds the height of the coolant outlet 51c in the secondary tank, the coolant 11b is moved to the coolant outlet 51c until the liquid level of the coolant 11b matches the height of the coolant outlet 51c. The coolant overflows toward the coolant discharge pipe 52c.

In the floating oil recovery device 50 having the above structure, when the scum 11a is supplied to the floating oil separation tank 51 instead of the floating oil 11c, it is not easy to rotate the adjustment socket 55 by inserting your hand into the layer of the scum 11a. , there is a possibility that the function of the floating oil overflow level adjustment mechanism 53 may not be exhibited. Further, since the inside of the adjustment socket 55 is quickly filled with the scum 11a that has flowed in, it is difficult to efficiently discharge the scum 11a. Therefore, even if the floating oil recovery device 50 having a conventionally known structure is used as a recovery device for the scum 11a, the scum 11a can be efficiently separated from the coolant 11b and recovered like the scum recovery device 1 of the present invention. This is considered difficult.

6(a) and 6(b) are a plan view and a side view of the float suction shown in FIG. 1(a), respectively, and FIG. 6(c) is a plan view and a side view of the float suction shown in FIG. It is an external perspective view of the scum inflow amount adjustment mechanism in the float suction shown. Further, FIGS. 6(d) and 6(e) are external perspective views of the shutter ring and suction cup shown in FIG. 6(c), respectively. 7(a) is a sectional view taken along the line CC in FIG. 6(c), and FIG. 7(b) shows a state in which the shutter ring has moved upward with respect to the suction cup in FIG. 7(a). FIG. FIGS. 8(a) and 8(b) are diagrams schematically showing how scum flows into the suction cup in FIGS. 7(a) and 7(b). 9(a) is a view taken in the direction of arrow D in FIG. 6(c), and FIG. 9(b) shows a state in which the shutter ring has moved in the circumferential direction with respect to the suction cup in FIG. 9(a). It is a diagram. 10(a) and 10(b) are a plan view and a side view of a modified example of the float suction shown in FIGS. 6(a) and 6(b), respectively, and FIG. 10(c) is a plan view and a side view of a modification of the float suction shown in FIGS. 10(a) and 10(b), and FIG. 10(d) is a sectional view taken along line EE in FIG. 10(c).
Note that FIGS. 6(c) to 6(e) show the shutter ring and the suction cup in an enlarged state compared to the state shown in FIGS. 6(a) and 6(b), and FIGS. 7 to 9 6 shows the shutter ring and suction cup in a more enlarged state than those shown in FIGS. 6(c) to 6(e). In addition, in FIGS. 6(a), 9(b), and 9(b), cutouts are provided in order to facilitate identification of portions with cutouts and portions without cutouts. The parts that are not marked are hatched. Furthermore, in FIGS. 8(a) and 8(b), the scum is schematically shown in an enlarged state compared to the case shown in FIG. 2(b). 10(c) and 10(d) show the suction cup in an enlarged state compared to the state shown in FIG. 10(a) and FIG. 10(b). In order to easily distinguish between the portions provided with a notch and the portions not provided with a notch, the portions not provided with a notch are hatched.
As shown in FIGS. 6(a) and 6(b), the float suction 6 includes a cylindrical suction cup 21 having a suction port 6a on the bottom surface 21a, and a suction cup 21 having a constant inner diameter and outer diameter. A flat plate member having a shutter ring 22 installed on the upper part of the suction cup 21, a mesh-like dustproof cover 23 installed to cover the upper part of the suction cup 21, and four arm parts 24a and forming a substantially cross shape in plan view. It consists of a connecting tool 24 whose central part is fixed to the bottom surface 21a of the suction cup 21, and a cylindrical shape with an insertion hole for a float fixing bolt 26 coaxially provided and erected at the tip of an arm part 24a. A float fixing bolt that is installed at the upper end of the spacer 25 and has a mounting part 27a provided with a bolt hole, and that communicates with the insertion hole provided at the tip of the arm part 24a and the insertion hole of the spacer 25. The float 27 is fixed to the connector 24 by screwing the float 26 into the bolt hole of the mounting portion 27a.

As shown in FIGS. 6(c) to 6(e) and FIGS. 7(a) and 7(b), the suction cup 21 has an annular groove 21d on the outer peripheral surface in which the O-ring 28 is installed. It has a stepped structure consisting of a small diameter part 21b and a large diameter part 21c, and the small diameter part 21b has four holes having a desired depth from the end surface 21e in the axial direction of the cylinder and a desired width in the circumferential direction. Notches 21f are provided at approximately equal intervals in the circumferential direction. Further, inside the suction cup 21, a large diameter portion 21g is provided on the end surface 21e side, and a small diameter portion 21h is provided on the bottom surface 21a side, and the inner diameter gradually decreases from the large diameter portion 21g to the small diameter portion 21h. It is formed like this.
On the other hand, the shutter ring 22 is a cylindrical body whose inner diameter is larger than the small diameter part 21b of the suction cup 21 and whose outer diameter is approximately equal to the large diameter part 21c of the suction cup 21, and has a desired depth from the end surface 22a in the cylindrical axial direction. Four notches 22b having a desired width in the circumferential direction are provided at approximately equal intervals in the circumferential direction. That is, the shutter ring 22 has a structure that can be extrapolated onto the small diameter portion 21b of the suction cup 21 (see FIG. 6(c)). Note that when the shutter ring 22 is not attached to the suction cup 21, the length of the O-ring 28 protruding from the annular groove 21d toward the outside of the suction cup 21 in the radial direction is determined by the inner diameter of the shutter ring 22 and the suction cup. It is longer than 1/2 of the difference from the outer diameter of the small diameter portion 21b of No. 21. That is, when the shutter ring 22 is inserted into the small diameter portion 21b of the suction cup 21 with the O-ring 28 installed in the annular groove 21d, the O-ring 28 is moved radially inward of the suction cup 21 by the shutter ring 22. Since they are in a crushed state, a large frictional force is generated between the inner surfaces of the O-ring 28 and the shutter ring 22. That is, in the float suction 6, the shutter ring 22 is movable vertically and circumferentially with respect to the suction cup 21, but due to the frictional force generated between the shutter ring 22 and the O-ring 28, the shutter ring 22 has a structure in which its position relative to the suction cup 21 is maintained.
That is, the O-ring 28 has the function of closing the gap between the outer surface of the suction cup 21 and the inner surface of the shutter ring 22, and also has the function of holding the shutter ring 22 so that it does not move inadvertently with respect to the suction cup 21. Note that when the gap between the outer surface of the suction cup 21 and the inner surface of the shutter ring 22 is small and the shutter ring 22 is held by the suction cup 21 only by the frictional force between the suction cup 21 and the shutter ring 22, If there is a low possibility that the scum 11a will flow out, the installation of the O-ring 28 may be omitted. Further, the suction cup 21 does not need to have a cylindrical shape as a whole, and it is sufficient that at least the upper portion onto which the shutter ring 22 is inserted has a cylindrical shape.

In the float suction 6, when the shutter ring 22 is viewed from the side, the scum 11a flows into the suction cup 21 through the overlapping portion of the notch 21f of the suction cup 21 and the notch 22b of the shutter ring 22. As shown in FIG. 8A, when the liquid level L of the coolant 11b in the coolant tank 5 becomes higher than the lower surface of the overlapping portion, the amount of the coolant 11b flowing into the suction cup 21 together with the scum 11a increases significantly. Therefore, in the float suction 6, by changing the size and material of the float 27 or changing the length of the spacer 25, the liquid level L of the coolant 11b is adjusted so as not to exceed the lower surface of the overlapping part. are doing. However, depending on the type of scum 11a and the amount of scum 11a stored inside the coolant tank 5, the height relationship between the liquid level L of the coolant 11b and the lower surface of the overlapping portion easily changes.
In the float suction 6, by moving the shutter ring 22 parallel to the cylinder axis direction with respect to the suction cup 21, the height of the lower surface of the overlapping portion becomes higher than the liquid level L of the coolant 11b in the coolant tank 5. , or become low. Therefore, according to the float suction 6 having such a structure, as shown in FIG. 8(b), the shutter ring 22 is moved parallel to the cylindrical axis direction with respect to the suction cup 21, and the lower surface of the overlapping portion is By making the height of the coolant 11b higher than the liquid level L of the coolant 11b in the coolant tank 5, it is possible to suppress the coolant 11b from flowing into the suction cup 21.

As already mentioned, in the float suction 6, when the shutter ring 22 is viewed from the side, the scum 11a flows into the suction cup 21 through the overlapping portion of the notch 21f of the suction cup 21 and the notch 22b of the shutter ring 22. The size of this overlapping portion (the range indicated by the arrow s in FIGS. 9(a) and 9(b)) is changed by rotating the shutter ring 22 about the cylindrical axis with respect to the suction cup 21. . In this case, the amount of scum 11a flowing into the suction cup 21 increases as the overlapping portion becomes larger, and decreases as the overlapping portion becomes smaller. Therefore, according to the scum collection device 1 equipped with the float suction 6, the amount of scum 11a flowing into the suction cup 21 can be easily adjusted by operating the shutter ring 22.
In this way, the float suction 6 has a structure in which the amount of scum 11a flowing into the suction cup 21 can be easily controlled by moving the shutter ring 22 up and down with respect to the suction cup 21 or by rotating it. ing. Note that it is desirable that a head difference of 15 mm or more be formed between the liquid level of the coolant 11b in the coolant tank 5 and the top of the scum 11a in the suction cup 21.

As shown in FIGS. 10(a) and 10(b), in the float suction 6, the float suction 29 sucks air into the bottom surface 30a instead of the suction cup 21, shutter ring 22, connector 24, spacer 25, and O-ring 28. It is characterized by comprising a cylindrical suction cup 30 provided with an opening 6a, a buoyancy adjustment weight 31, a connector 32, and a locking nut 33. Although the dustproof cover 23 is not shown in FIGS. 10(a) and 10(b), the float suction 29 may have a structure including the dustproof cover 23.
A connecting tool 32 made of a flat plate material and provided with three arm portions 32a has a center portion fixed to the bottom surface 30a of the suction cup 30, and a bolt hole for a float fixing bolt 26 is provided at the tip of the arm portion 32a. It is being The float 27 is fixed to the connector 32 by screwing the float fixing bolt 26, which is screwed into the bolt hole, into the bolt hole of the mounting portion 27a. Further, a locking nut 33 is attached to the float fixing bolt 26 so as to come into contact with the lower end of the attachment part 27a, and the annular buoyancy adjustment weight 31 is connected to a coupling member such that the suction cup 30 is disposed inside. It is installed on the top surface of 32.
As shown in FIGS. 10(c) and 10(d), the suction cup 30 has three notches 30c having a desired depth from the end surface 30b in the cylindrical axial direction and a desired width in the circumferential direction. They are provided at approximately equal intervals in the circumferential direction. Further, inside the suction cup 30, a large diameter part 30d is provided on the end face 30b side, and a small diameter part 30e is provided on the bottom face 30a side, and the inner diameter gradually decreases from the large diameter part 30d to the small diameter part 30e. It is formed like this.

In the float suction 29 having such a structure, the scum 11a stored in the coolant tank 5 flows into the suction cup 30 through the notch 30c of the suction cup 30. Therefore, by changing the length of the float fixing bolt 26 screwed into the mounting portion 27a of the float 27 and the weight of the buoyancy adjustment weight 31, the height of the lower surface of the notch 30c can be adjusted to the liquid level L of the coolant 11b of the coolant tank 5. (See FIG. 8(a)). However, with the method of adjusting the length of each of the three float fixing bolts 26 into which the float 27 is screwed into the mounting portion 27a, it is difficult to keep the float suction 29 horizontal. Further, it is difficult to finely adjust the weight of the buoyancy adjustment weight 31. Therefore, in the float suction 29, it is not easy to adjust the amount of scum 11a flowing into the suction cup 30.
On the other hand, in the float suction 6, the amount of scum 11a flowing into the suction cup 21 can be easily adjusted by operating the shutter ring 22 as described above.

FIG. 11(a) is a plan view showing a state in which the scum suction pipe is connected to the float suction in FIG. 6(a) using a rotary joint, and FIG. 11(b) is a plan view showing the state in which the scum suction pipe is connected to the float suction in FIG. It is an arrow view. 12(a) and 12(b) are a cross-sectional view taken along the line GG in FIG. 11(a) and a view taken along the H direction in FIG. 11(b), respectively. FIG. 13(a) is a diagram showing a state in which the scum suction tube is directly connected to the float suction in FIG. 10(b), and FIG. 13(b) is a diagram showing a state in which the scum suction tube is rotated in FIG. FIG. In addition, in FIG. 11(a), in order to make it easier to distinguish between the parts with a cutout and the parts without a cutout, the parts without a cutout are hatched. 12(a) is shown in an enlarged state compared to the case shown in FIG. 11(a). Further, in FIGS. 13(a) and 13(b), parts of the side plate and bottom plate of the coolant tank are shown with hatching indicating that they are cross sections. Components shown in FIGS. 6 and 7 are given the same reference numerals, and their explanations will be omitted as appropriate.
The float suction 6 shown in FIGS. 11(a) and 11(b) and FIGS. 12(a) and 12(b) includes a suction cup 34 instead of the suction cup 21. The suction cup 34 has a structure in which a pair of suction ports 6a, 6a are provided on the lower side surface 34a, instead of the suction port 6a of the float suction 6 provided on the bottom surface 21a of the suction cup 21 (see FIG. 12(a). )reference). Instead of the scum suction pipe 7a, a scum suction pipe 35 whose tip end is branched into two using a Y-shaped joint 37 as shown in FIG. They are connected via a pair of rotary joints 36, 36, which are installed such that their shafts are perpendicular to the cylindrical axis of the suction cup 34.

The float suction 6 floating in the coolant 11b inside the coolant tank 5 descends as the liquid level L of the coolant 11b (see FIG. 13(b)) decreases. At this time, if the scum suction pipe 7a is directly connected to the suction port 6a of the float suction 29 provided on the bottom surface of the suction cup 30 as shown in FIG. The float suction 29 can only descend to a predetermined height. Further, when a part of the scum suction tube 7a comes into contact with the bottom surface 5a of the coolant tank 5 as the float suction 29 descends, a force acting on the scum suction tube 7a from the bottom surface 5a of the coolant tank 5 is applied via the scum suction tube 7a. and is transmitted to the suction cup 30. As a result, the suction cup 30 is tilted and a large amount of coolant 11b flows into the interior of the suction cup 30. On the other hand, in the float suction 6 shown in FIGS. 11 and 12, in addition to the suction port 6a of the float suction 6 being provided on the lower side surface 34a of the suction cup 34, Since the connected portion rotates around the rotation axis of the rotary joint 36, the scum suction pipe 35 does not become an obstacle when the float suction 6 descends. In addition, as the part of the scum suction pipe 35 connected to the suction port 6a rotates around the rotation axis of the rotary joint 36, the float suction 6 descends and a part of the scum suction pipe 35 is exposed to the bottom surface of the coolant tank 5. 5a, the force that the scum suction pipe 35 receives from the bottom surface 5a of the coolant tank 5 is small, so it is unlikely that the suction cup 34 will be tilted by that force. Therefore, in the scum recovery device 1 equipped with the float suction 6 having the above structure, the liquid level L of the coolant 11b in the coolant tank 5 (see FIG. 13(b)) is such that the suction port 6a of the float suction 29 is The float suction 6 can function even when lowered to a lower position than when it is provided on the bottom surface. Furthermore, even when the float suction 6 is lowered, the suction cup 34 is tilted due to the force received by the scum suction pipe 7a from the bottom surface 5a of the coolant tank 5, and a large amount of coolant 11b flows into the suction cup 34. This situation can be prevented. Furthermore, since the scum suction pipe 35 is connected to the suction port 6a of the float suction 6, which is provided symmetrically on the horizontal axis at the center of the lower part of the suction cup 34, through the rotary joint 36, the liquid Even if the suction cup 34 moves due to surface fluctuation, the position of the center of gravity does not change, and the liquid level L of the coolant 11b (see FIG. 13(b)) and the lower surface of all the notches 21f in the suction cup 34 are always kept parallel. dripping That is, in the float suction 6, since the suction cup 34 follows the fluctuation of the liquid level L of the coolant 11b in the coolant tank 5 (see FIG. 13(b)), the scum 11a is efficiently removed from the entire circumferential surface of the suction cup 34. It is possible to collect it.
Note that in existing machine tools, the tank corresponding to coolant tank 5 is often shallow, but when such a machine tool is operated for 24 hours, the amount of coolant 11b that adheres to the work increases, so the coolant in the tank The liquid level L of 11b (see FIG. 13(b)) may drop in a short period of time. In this case, in the float suction 29 shown in FIG. 13(a), the scum suction pipe 7a comes into contact with the bottom surface of the tank as described above.

FIG. 14(a) is an external perspective view of a mechanism for adjusting the amount of scum flowing into the float suction in a scum collection device according to a second embodiment of the present invention, and FIGS. 14(b) to 14(d) are diagrams. 14(a) is an external perspective view of a suction cup, a float shutter, and a floating aid that constitute the float suction shown in FIG. 14(a). 14(e) and 14(f) are a cross-sectional view taken along the line JJ in FIG. 14(b) and a cross-sectional view taken along the line KK in FIG. 14(c), respectively. 15(a) is a sectional view taken along the line II in FIG. 14(a), and FIG. 15(b) is a sectional view taken along the line II in FIG. 14(a). It is a diagram showing a moved state. In addition, in FIGS. 15(a) and 15(b), the suction cup is shown in a larger size than in the case shown in FIG. 14(a), and the scum is shown in a larger size than in the case shown in FIG. 2(b). The state is shown schematically. Further, the constituent elements shown in FIGS. 6 to 8 are designated by the same reference numerals, and the description thereof will be omitted as appropriate.
In the scum collection device of this embodiment, in the scum collection device 1 described in Embodiment 1, the scum inflow amount adjustment mechanism in the float suction 6 is replaced by a suction cup 38, a float shutter, and a suction cup 38 instead of the suction cup 21, shutter ring 22, and O-ring 28. 39 and a floating aid 40.
As shown in FIGS. 14(a), 14(b), and 14(e), the suction cup 38 is made of a cylindrical body with a suction port 6a provided on the bottom surface 38a, and the suction cup 38 is made of a cylindrical body with a suction port 6a provided on the bottom surface 38a. Four notches 38c having a depth and a desired width in the circumferential direction are provided at approximately equal intervals in the circumferential direction. Further, inside the suction cup 38, a large diameter portion 38d is provided on the end surface 38b side, and a small diameter portion 38e is provided on the bottom surface 38a side. The suction cup 38 has a constant inner diameter at the large diameter portion 38d, but is formed so that the inner diameter once becomes small at the end of the large diameter portion 38d, and then gradually becomes smaller toward the small diameter portion 38e. .
As shown in FIGS. 14(c) and 14(f), the float shutter 39 is made of a cylindrical body with a constant outer diameter, and has an inclined portion inside thereof so that the inner diameter gradually decreases from the end surface 39a to a desired depth. 39c is provided, and a large diameter portion 39d is provided between the terminal end of the inclined portion 39c and the end face 39b where the inner diameter is the smallest. Note that the large diameter portion 39d is formed so that its inner diameter is larger than the inner diameter of the terminal end of the inclined portion 39c.
As shown in FIG. 14(d), the floating aid 40 has a cylindrical shape with an outer diameter smaller than the inner diameter of the large diameter part 39d of the float shutter 39 and larger than the inner diameter of the terminal end of the inclined part 39c, and It is formed of a member having a smaller specific gravity than 11b. That is, the floating aid material 40 can be installed inside the large diameter portion 39d of the float shutter 39, and when the floating aid material 40 is inserted into the float shutter 39 from the end surface 39b side, the end surface 40a becomes the terminal end of the inclined portion 39c. (See FIG. 15(a) or FIG. 15(b)).

In the scum collection device having the above structure, when the coolant 11b flows into the suction cup 38 and accumulates therein, buoyancy is generated in the floating aid 40, so the float shutter 39 moves upward inside the suction cup 38 together with the floating aid 40. . At this time, since the amount of movement of the float shutter 39 is determined by the magnitude of the buoyant force generated in the floating aid 40, the amount of movement is influenced by the amount of coolant 11b accumulated in the suction cup 38. That is, in the scum collection device having the above structure, the length by which the end surface 39a of the float shutter 39 projects above the notch 38c of the suction cup 38 changes depending on the amount of coolant 11b accumulated in the suction cup 38. .
As shown in FIG. 15(a), when the liquid level L of the coolant 11b in the coolant tank 5 becomes higher than the lower surface of the notch 38c of the suction cup 38, the coolant 11b flowing into the suction cup 38 through the notch 38c However, if the end surface 39a of the float shutter 39 protrudes above the notch 38c of the suction cup 38, the liquid level L of the coolant 11b in the coolant tank 5 will increase significantly. The amount of coolant 11b flowing into the suction cup 38 will not increase significantly unless the amount exceeds . As described above, the length by which the end surface 39a of the float shutter 39 projects above the notch 38c of the suction cup 38 changes depending on the amount of coolant 11b accumulated in the suction cup 38. For example, when the amount of coolant 11b accumulated in the suction cup 38 increases, the end surface 39a of the float shutter 39 protrudes above the notch 38c of the suction cup 38, as shown in FIG. The amount of coolant 11b flowing into suction cup 38 is suppressed. That is, according to the scum recovery device of this embodiment, when the amount of coolant 11b flowing into the suction cup 38 increases, the end surface 39a of the float shutter 39 protrudes upwardly from the lower surface of the notch 38c of the suction cup 38. This has the effect of suppressing the coolant 11b from flowing into the suction cup 38.
In this way, in the scum collection device 1 of this embodiment, a desired head is automatically formed between the liquid level L of the coolant 11b in the coolant tank 5 and the top of the scum 11a in the suction cup 38. It has a structure.

The scum collection device of the present invention is not limited to the structure shown in the first and second embodiments. For example, an electric pump can be used instead of the air-driven diaphragm pump 9. Further, the scum supply port 2b and the coolant discharge port 2c may be provided at either the lower part of the side plates 2d to 2f of the scum separation tank 2 or the bottom plate 2g.

The scum recovery device of the present invention is a method for collecting foamy scum generated from machining fluid (oil) used for lubrication and cooling during primary processing (forming processing using forging, heading machines, etc.) and secondary processing (grinding finishing processing) in machine tools. It can be used to separate and collect floating objects.

1... Scum collection device 2... Scum separation tank 2a... Scum discharge port 2b... Scum supply port 2c... Coolant discharge port 2d-2f... Side plate 2g... Bottom plate 2h... Insertion hole 3... Scum overflow level adjustment mechanism 4... Overflow shutter mechanism 5 ...Coolant tank 5a...Bottom surface 6...Float suction 6a...Suction port 7a...Scum suction pipe 7b...Scum introduction pipe 8...Filter 9...Air-driven diaphragm pump 10...Scum tank 11a...Scum 11b...Coolant 11c...Floating oil 12a-12c ...Coolant discharge pipe 13a, 13b...Nut 14...Joint 14a...Male thread part 15...Seal packing 16...Connection tool 17a...Opening part 17b...Enclosure 18...Bolt 19...Shutter 19a...Mounting part 19b...Flat plate part 19c...Elongated hole 19d...Top end 20...Fixing tool 20a...Bending part 20b...Connection part 20c...Reinforcement part 20d...Bolt hole 21...Suction cup 21a...Bottom surface 21b...Small diameter part 21c...Large diameter part 21d...Annular groove 21e...End face 21f...Notch 21g...Large diameter part 21h...Small diameter part 22...Shutter ring 22a...End face 22b...Notch 23...Dustproof cover 24...Connector 24a...Arm part 25...Spacer 26...Float fixing bolt 27...Float 27a...Mounting part 28...O Ring 29... Float suction 30... Suction cup 30a... Bottom surface 30b... End surface 30c... Notch 30d... Large diameter part 30e... Small diameter part 31... Buoyancy adjustment weight 32... Connector 32a... Arm part 33... Locking nut 34... Suction cup 34a...Lower side surface 35...Scum suction pipe 36...Rotary joint 37...Y type joint 38...Suction cup 38a...Bottom surface 38b...End face 38c...Notch 38d...Large diameter part 38e...Small diameter part 39...Float shutter 39a, 39b...End face 39c... Inclined part 39d... Large diameter part 40... Floating auxiliary material 40a... End face 50... Floating oil recovery device 51... Floating oil separation tank 51a... Floating oil outlet 51b... Floating oil supply port 51c... Coolant outlet 51d... Bottom plate 51e ...Partition plate 52a, 52b...Floating oil discharge pipe 52c...Coolant discharge pipe 52d...Floating oil introduction pipe 53...Floating oil overflow level adjustment mechanism 54a...Male thread part 54b...Female thread part 55...Adjust socket 55a...Top end

Claims (5)

A scum collection device that separates and collects scum from a coolant used for lubricating and cooling machining parts in machine tools,
a coolant tank in which the coolant is stored together with the scum;
A float made of a member having a specific gravity smaller than that of the coolant is attached and installed in the coolant tank so as to float on the liquid surface of the coolant so that the scum floating on the liquid surface of the coolant flows into the inside. float suction,
a scum separation tank having a scum discharge port, a scum supply port, and a coolant discharge port;
a scum suction pipe having one end connected to the scum supply port of the scum separation tank and the other end connected to the suction port of the float suction;
a pump that sends the scum from the float suction to the scum separation tank via the scum suction pipe ,
The float suction is
a suction cup in which at least an upper part has a cylindrical shape and the suction port is provided in the lower part so as to be connected to the opening in the upper part;
a shutter ring having a cylindrical shape and fitted onto the upper part of the suction cup so that the cylindrical axes thereof coincide with each other and the shutter ring is rotatable about the cylindrical axis;
The suction cup and the shutter ring are each provided with a notch having a desired depth from each upper end surface in a direction parallel to the cylindrical axis and a desired width in the circumferential direction,
A scum recovery device, wherein the scum discharge port and the scum supply port are provided at the upper and lower portions of the scum separation tank, respectively, and the coolant discharge port is provided at a lower position than the scum discharge port. a shutter made of a thin plate and installed so that it can slide vertically along a side plate of the scum separation tank in which the scum discharge port is provided, and that its upper end can protrude above the lower surface of the scum discharge port; ,
The scum collection device according to claim 1, further comprising a fixing means for fixing the shutter to the scum separation tank at a desired height. an overflow pipe having one end connected to the coolant outlet of the scum separation tank;
It is equipped with a length adjustment means for changing the length of this overflow pipe,
The other end of the overflow pipe is disposed at a lower or higher position than the lowest point on the inner surface of the scum discharge port by operating the length adjusting means. 2. The scum collection device according to 2. The suction port of the float suction is provided on a lower side surface of the suction cup,
The other end of the scum suction pipe is connected to the suction port via a rotary joint installed on the suction cup so that the rotation axis is perpendicular to the cylindrical axis. The scum collection device according to any one of Item 3 . comprising a scum introduction pipe whose one end is connected to the scum supply port;
1. The scum introduction pipe is installed in the scum separation tank with the other end facing a location opposite to a location where the scum discharge port is provided in the scum separation tank. The scum collection device according to any one of claims 4 to 5.

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