JP2023050812A - Scum recovery apparatus - Google Patents

Abstract

To provide a scum recovery apparatus capable of efficiently separating and recovering scum floating on a surface of coolant from the coolant.SOLUTION: A scum recovery apparatus 1 includes: a scum separation tank 2 with a scum discharge port 2a at the top and a scum supply port 2b and a coolant discharge port 2c at the bottom; a scum overflow level adjustment mechanism 3 connected to the coolant discharge port 2c; a coolant tank 5 in which scum 11a and coolant 11b are stored; a float suction 6 installed inside the coolant tank 5; an overflow shutter mechanism 4 installed at the scum discharge port 2a; and a scum suction pipe 7a connected at one end to the scum supply port 2b and at the other end to a suction port 6a of the float suction 6. The scum suction pipe 7a has a filter 8 and an air-driven diaphragm pump 9, and a scum tank 10 is installed below the scum discharge port 2a.SELECTED DRAWING: Figure 1

Description

Applied for application of 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 (bubble-like floating scum) mixed in coolant (cooling liquid) during machining, and in particular, efficiently separates the scum floating on the liquid surface from the coolant. It relates to a scum collection device capable of collecting.

In machining such as forging and heading, the surface of the object to be processed is subjected to bonde treatment (treatment to form a lubricating film on the surface of the object by phosphate coating treatment). The applied lubricating coating peels off and mixes in the coolant during the grinding finish. A large amount of scum is generated by the chemical reaction of this lubricating film with sliding surface oil, coolant, and the like. In the past, the scum generated in the coolant liquid was collected manually, but there was a problem that the work efficiency was poor and it required a lot of time and labor to collect the scum.

In order to deal with such problems, for example, Patent Document 1 discloses a device for recovering floating substances such as floating oil and sludge on the liquid surface under the name of "Recovery device and method for floating oil and floating sludge". An invention relating to the method is disclosed.
The recovery device disclosed in Patent Document 1 is a mixed liquid such as floating oil (oil with light specific gravity that floats on water) and sludge (highly viscous dirt generated in internal combustion engines such as automobile engines and sticking in the combustion chamber). a tank containing a reservoir, a flexible hose having an inlet for the mixed liquid and installed in the tank, two or more floats attached to the flexible hose such that the inlet is positioned at the liquid level of the tank; A pump case is provided to fix the float and enclose the immersion of the low-level submersible pump or coolant pump. The drop port is provided so as to be held at a position higher than the water level in the pump case.
According to the recovery device of such a structure, it is possible to efficiently suck oil and sludge floating on the liquid surface following fluctuations in the liquid surface, and to exhibit the effect with extremely inexpensive equipment. can be done.

In addition, Patent Document 2 discloses a device for extracting sludge contained in coolant used for lubrication and cooling of machining parts of machine tools, under the name of "coolant liquid purification device".
The coolant 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 that is installed in the center of the water tank and sucks in the coolant. , is equipped with an injection nozzle installed in the water tank so that the coolant can be injected toward the wall surface of the peripheral wall in a state of being immersed in the coolant, and the coolant liquid jet flowed from the injection nozzle flows in the circumferential direction of the peripheral wall. The injection nozzles are arranged so as to collide with the peripheral wall at an angle such that the liquid flows along only one direction.
In a coolant purifying device with such a structure, a strong vertical convection in the radial direction of the water tank is generated between the upper and lower parts of the coolant due to the swirling flow and annular vertical convection of the coolant generated in the water tank. Sludge that tries to deposit on the bottom surface gathers in the center. Therefore, sludge and the like can be reliably taken out to the outside by the suction pipe. As a result, no sludge builds up in the water tank, which saves the trouble of removing the sludge and the like, and also eliminates the need to stop the processing machine.

Further, Patent Literature 3 discloses a device related to a device in which a trough for collecting scum is installed in the tank under the name of "a scum removing device in a rolling coolant oil tank".
The scum removing device disclosed in Patent Document 3 includes a trough installed in a rolling coolant oil tank to collect scum while floating on the liquid surface, a main float and an auxiliary float fixed to the trough, and a rolling coolant A scum discharge pipe, one end of which communicates with the outside of the oil tank and the other end of which is connected to the bottom of the trough, is displaceable following fluctuations in the liquid surface, and the inner surface of the trough is sprayed with water to destroy foamy scum. The scum collection level of the trough can be adjusted by providing an auxiliary float capable of supplying and discharging air.
In the scum removing device with such a structure, the collection level of the trough automatically follows fluctuations in the liquid level of the coolant tank due to the action of the auxiliary float, so that optimum scum removal can always be performed. . In addition, since the foamy scum collected in the trough is destroyed by water spraying, it is possible to smoothly discharge the scum to the outside of the device.

JP 2013-230458 A Utility Model Registration No. 3129588 Japanese Utility Model Laid-Open No. 57-148486

In the recovery device disclosed in Patent Document 1, a low water level submersible pump or coolant pump is operated so that the mixed liquid drop port is brought to the water level in the pump so that the mixed liquid flows into the pump case from the mixed liquid drop port 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 following the fluctuation. If the liquid level in the tank moves downward and the drop distance between the mixed liquid inlet and the mixed liquid drop outlet of the flexible hose is not sufficiently secured, the mixed liquid will stop flowing into the mixed liquid inlet. I had a problem. Furthermore, if the immersion interval between the liquid surface in the tank and the liquid mixture inlet is out of the range of 1 mm to 5 mm, the effect that the air and floating objects flow together with the liquid mixture into the liquid mixture inlet while forming a vortex cannot be sufficiently exhibited. There was a problem.
In the coolant purifying device disclosed in Patent Document 2, a coolant liquid jet flow ejected from an injection nozzle generates a coolant swirling flow and an annular vertical convection in the 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 central part, it is possible to reliably take out sludge and the like to the outside with the suction pipe. However, the device disclosed in Patent Document 2 aims to prevent sludge from accumulating in the water tank, and does not have the function of separating the sludge from the coolant, so a filtration device must be provided downstream. I had a problem. In addition, since there is no detailed description of the filtration processing device in Patent Document 2, its specific structure is unknown.
In the scum removing device disclosed in Patent Document 3, it is not easy to adjust the height between the trough and the liquid surface of the oil tank, so there is a problem of poor workability. In addition, in the scum removing device, if the liquid surface of the coolant is wavy, a large amount of coolant may flow into the trough together with the scum. There was a problem that it was not possible to

SUMMARY OF THE INVENTION It is an object of the present invention to provide a scum recovery device capable of efficiently separating and recovering scum floating on the surface of coolant from the coolant. aim.

In order to achieve the above object, a first invention is a scum recovery device for separating and recovering scum from coolant used for lubricating and cooling machined parts in a machine tool, comprising a coolant tank in which coolant is stored together with scum. A float made of a material with a lower specific gravity than the coolant is attached to the float suction installed in the coolant tank so that the scum floating on the coolant surface flows into the coolant tank. 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 that delivers 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 top and bottom of the scum separation tank, respectively, and the coolant is discharged. The outlet is provided at a position lower than the scum discharge port.
In the first invention, the scum supplied from the scum supply port to the inside of the scum separation tank floats in the coolant and forms a foam layer of a predetermined thickness on the liquid surface of the coolant, so that the scum discharge port It has the effect that scum is less likely to mix with the coolant discharged from the coolant discharge port provided at a position lower than that. In addition, since only the scum that reaches 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 to the outside of the scum separation tank together with the scum is kept small. It has the effect of

According to a second invention, in the first invention, the separator is made of a thin plate, is slidable in the vertical direction along the side plate of the scum separation tank provided with the scum discharge port, and has an upper end above the lower surface of the scum discharge port. It is characterized by comprising a shutter installed so as to be able to protrude upwards, and fixing means for fixing the shutter to the scum separation tank at a desired height.
The surface tension of the scum caused by the lubricating film formed on the surface of the object to be processed by the bonder treatment varies depending on the processing method and processing equipment of the object. In particular, when the lower surface of the scum discharge port is processed into an arc-shaped curved surface when viewed from the side or when there is a welded layer, the difference in the surface tension of the scum is conspicuous. There is 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 effects of the first invention, the difference in the surface tension of the scum is less likely to appear at the upper end of the shutter made of a thin plate. has the effect of alleviating the above-mentioned problem of occurrence of In addition, since only scum that exceeds 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 the first invention or the second invention, comprising an overflow pipe having one end connected to a coolant outlet of the scum separation tank, and a length adjusting means for changing the length of the overflow pipe. By operating this length adjusting means, 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.
In the third invention, when the liquid surface of the coolant stored in the scum separation tank reaches a predetermined height inside the overflow pipe, the coolant begins to overflow 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 effect 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 the highest among the inner surfaces of the scum discharge port. It has the effect of making it higher or lower than the lower part.

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 upper opening, a shutter ring having a cylindrical shape and being fitted around the upper part of the suction cup so that the axes of the cylinders coincide with each other and are rotatable around the axis of the cylinder; Notches having a desired depth in the direction parallel to the cylindrical axis and having a desired width in the circumferential direction are provided.
In the fourth invention, in addition to the effect of any one of the first to third inventions, when the shutter ring is viewed from the side, the cutout of the suction cup and the cutout of the shutter ring overlap. When the scum flows into the suction cup and the shutter ring rotates about the cylindrical axis with respect to the suction cup, the size of the overlapped portion changes to increase the amount of scum flowing into the suction cup. It has the effect of changing. Also, by moving the shutter ring parallel to the cylinder axis direction with respect to the suction cup, the height of the lower surface of the overlapping portion becomes higher or lower than the liquid level of the coolant in the coolant tank. have

According to a fifth aspect of the present invention, in place of the shutter ring, a cylindrical body inserted in the suction cup and a floating assisting tool made of a member attached to the cylindrical body and having a lower specific gravity than the coolant are provided. The cylindrical body is installed so that the upper end can protrude upward from the notch of the suction cup and can move vertically with respect to the suction cup.
In the fifth aspect of the invention, when the coolant flows into the suction cup and accumulates therein, buoyancy is generated in the floating auxiliary member, so that the cylindrical body moves upward in the suction cup together with the floating auxiliary member. Since the amount of movement of the cylindrical body is determined by the magnitude of the buoyancy generated in the levitation aid, it is affected 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 protrudes 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 in 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 via the
The float suction, which floats in the coolant inside the coolant tank, descends as the coolant level drops. The scum suction pipe becomes an obstacle during the descent of the float suction. In addition, when part of the scum suction pipe comes into contact with the bottom surface 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, resulting in the suction There is a risk that the cup will tilt and a large amount of coolant will flow into the suction cup. In contrast, in the sixth aspect of the 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 on the rotary shaft of the rotary joint. As a result, in addition to the effect of the fourth or fifth invention, the scum suction pipe connected to the suction port does not become an obstacle when the float suction moves downward. In addition, even if the part connected to the suction port of the scum suction pipe rotates around the rotating shaft of the rotary joint, the float suction descends and part of the scum suction pipe contacts the bottom of the coolant tank. Since the force that the scum suction pipe receives from the bottom surface of the coolant tank is small, it is unlikely that the force will tilt the suction cup.

According to a seventh invention, in any one of the first invention to the sixth invention, a scum introduction pipe having one end connected to the scum supply port is provided, and the scum introduction pipe is connected to the scum separation tank through the scum discharge port. It is installed in the scum separation tank with the other end directed to a location facing the location where the is provided.
In the seventh invention, the scum supplied from the scum supply port into the scum separation tank is discharged through the scum introduction pipe to a location away from the scum discharge port. A situation in which the liquid level of the coolant fluctuates in the vicinity of the discharge port is unlikely to occur. Therefore, in the seventh invention, the effect of the first invention that the amount of coolant discharged from the scum discharge port to the outside of the scum separation tank together with the scum is suppressed to a small amount is exhibited more reliably. In addition, the scum newly discharged from the scum introduction pipe to a location opposite to the location where the scum discharge port is provided pushes up the already discharged scum from below and pushes it toward the scum discharge port. As a result, solidification of the scum accompanying retention is prevented, and the scum becomes dense in the vicinity of the scum discharge port, so that the amount of scum discharged from the scum discharge port per unit time increases. The amount of coolant discharged together with the scum from the scum discharge port is reduced. Furthermore, since the range in which the scum is discharged from the scum introduction pipe is limited, the effect of the first invention that scum is less likely to mix with the coolant discharged from the coolant discharge port can be further exhibited.

In the first invention, when the scum is discharged from the scum discharge port, the coolant is hardly discharged, and when the coolant is discharged from the coolant discharge port, the scum is separated from the coolant. increase in 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 the scum that can be discharged from the scum discharge port, coolant can be prevented from being discharged from the scum discharge port. In addition, even if the lower surface of the scum discharge port is processed into an arc-shaped curved surface when viewed from the side or if a welded layer exists, the phenomenon that the flowability of the scum is different due to the influence of surface tension. Therefore, the effect of the first invention that the scum can be efficiently separated from the coolant and recovered can be similarly exhibited.

When the liquid level of the coolant in the scum separation tank becomes higher than the lowest portion of 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 length adjusting means is operated to change the length of the overflow pipe so that 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. be able to. In this case, there is no possibility that the coolant will be 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, fine adjustment of the liquid surface of the coolant is possible, so that the coolant is prevented from being discharged from the scum discharge port and the scum is separated. It is effective in that it can be efficiently discharged 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 around the cylindrical axis with respect to the suction cup, the air flows into the suction cup. It is effective in being able to adjust the amount of scum. In addition, when the liquid level of the coolant in the coolant tank is higher than the lower surface of the overlapping portion of the notch of the suction cup and the notch of the shutter ring, the amount of coolant that flows into the suction cup through the overlapping portion increases significantly. 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 liquid level of the coolant in the coolant tank. By making it higher than , it is possible to suppress the inflow of coolant into the suction cup. Furthermore, by appropriately controlling the amount of scum flowing into the suction cup, it is possible to minimize the discharge capacity of the pump. As a result, the residence time of the scum in the scum separation tank increases, so the scum separation capacity increases.

When the liquid level of the coolant in the coolant tank becomes higher than the lower surface of the cutout of the suction cup, the amount of coolant flowing into the suction cup through the cutout increases significantly. , when the upper end of the cylinder protrudes above the notch of the suction cup, unless the liquid level of the coolant in the coolant tank exceeds the upper end of this cylinder, the amount of coolant that flows into the suction cup is significantly reduced. does not increase to As already described, the length by which the upper end of the cylindrical body protrudes above the notch of the suction cup changes according to the amount of coolant accumulated 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 inflow of coolant into the suction cup is suppressed.

According to the sixth invention, in addition to the effects of the fourth or fifth invention, the scum suction pipe does not become an obstacle when the float suction is lowered. The effect is that the float suction can function even when the suction port is lowered to a lower position than when the suction port is provided on the bottom surface of the suction cup. In addition, even when the float suction moves downward, it is possible to prevent a situation in which a large amount of coolant flows into the suction cup due to the force received by the scum suction pipe from the coolant tank, causing the suction cup to tilt.

According to the seventh invention, when the scum is supplied to the scum separation tank, the liquid level of the coolant is less likely to fluctuate in the vicinity of the scum discharge port. As the ratio increases, less coolant is discharged with the scum from the scum outlet. Furthermore, since the fluidity of the scum is less likely to deteriorate and the scum is less likely to mix with the coolant discharged from the coolant discharge port, the scum can be efficiently separated from the coolant and recovered. The effect is exhibited more.

1(a) is a schematic diagram of a scum recovery device according to a first embodiment of the present invention, and FIG. 1(b) is an external view of a scum overflow level adjusting mechanism in FIG. 1(a). (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 shown in FIG. It is a front view of the shutter which concerns on the modification of a shutter. 2(a) is a side view of the scum separation tank enlarging the periphery of the scum discharge port in FIG. 2(a), and FIG. 2(b) is a cross-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 a floating oil overflow level adjustment mechanism in (a) of the figure. (a) and (b) are respectively a plan view and a side view of the float suction shown in FIG. It is an external appearance perspective view of an adjustment mechanism, (d) and (e) are external appearance perspective views of a shutter ring and a suction cup shown in the same figure (c), respectively. (a) is a cross-sectional view taken along line CC in FIG. 6(c), and (b) is a view showing a state in which the shutter ring has moved upward with respect to the suction cup in FIG. 6(a). be. 7(a) and 7(b) schematically show how scum flows into the suction cup in FIGS. 7(a) and 7(b). FIG. (a) is a view in the direction of arrow D in FIG. 6(c), and (b) is a view showing a state in which the shutter ring moves 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 modification of the float suction shown in FIGS. 6(a) and 6(b), respectively; FIG. 3B is an external perspective view of the suction cup shown in FIG. 4D, and 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. 11(a) and 11(b) are a cross-sectional view taken along line GG in FIG. 11(a) and a view taken along line 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) shows a state in which the scum suction pipe is rotated in FIG. 12 (b). It is a diagram. (a) is an external perspective view of a scum inflow amount adjusting mechanism to a float suction in a scum recovery device according to a second embodiment of the present invention, and (b) to (d) are shown in FIG. FIG. 2 is an external perspective view of a suction cup, a float shutter, and a floating aid that constitute a float suction, and (e) and (f) are a cross-sectional view taken along the line JJ in FIG. ) is a cross-sectional view taken along the line KK. 14(a) is a cross-sectional view taken along line II in FIG. 14(a), and FIG. 14(b) shows a state in which the float shutter and the levitation aid have moved upward relative to the suction cup in FIG. 14(a). It is a diagram showing.

A scum recovery apparatus of the present invention will be specifically described with reference to FIGS. 1 to 15. FIG. In the following explanation, it is assumed that the scum recovery device is actually used, that is, the scum separation tank and coolant tank are placed on a horizontal surface. Expressions such as "upper end" and "lower end" are used.

FIG. 1(a) is a diagram schematically showing the configuration of the scum recovery device according to the first embodiment of the present invention, and FIG. 1(b) is a scum overflow level adjustment mechanism in FIG. 1(a). It is the figure which showed the external appearance. In addition, in FIG. 1(a), illustration of the scum in the scum separation tank is omitted, and the position of the liquid level of the coolant in the scum separation tank is indicated by the dashed line X. As shown in FIG.
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. In addition, in FIG.2(b), illustration of the bolt shown to Fig.2 (a) is abbreviate|omitted. A solid-line arrow B shown in FIG. 2B 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 fixture, respectively. 3(d) and 3(e) are front views of shutters according to modifications of the shutter shown in FIG. 3(b). FIG. 4(a) is a side view of the scum separation tank with the periphery of the scum discharge port enlarged in FIG. 2(a), and FIG. 4(b) is a cross-sectional view taken along the line AA in FIG. be. It should be noted that illustration of bolts is omitted in FIG. 4(a).

As shown in FIG. 1(a), the scum recovery apparatus 1 of the present invention includes a scum separation tank 2 having a scum discharge port 2a provided in the upper portion and a scum supply port 2b and a coolant discharge port 2c provided in the lower portion, A scum overflow level adjusting mechanism 3 connected to the coolant discharge port 2c, a coolant tank 5 in which the coolant 11b is stored together with the scum 11a, and coolant so that the scum 11a floating on the liquid surface of the coolant 11b flows inside. A float suction 6 installed inside the coolant tank 5 so as to float on the liquid surface of 11b, an overflow shutter mechanism 4 installed at the scum discharge port 2a of the scum separation tank 2, and a scum supply of 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 in addition to a metal or plastic hose, a scum suction pipe 7a made of an easily deformable flexible hose is provided, A filter 8 and an air-driven diaphragm pump 9 are interposed in the scum suction pipe 7a. A scum tank 10 for storing the scum 11a discharged from the scum separation tank 2 is installed below the scum discharge port 2a, although it is not an essential component of the scum recovery apparatus 1. Although the coolant discharge port 2c is not necessarily provided at the bottom of the scum separation tank 2, it must be provided at least at a position lower than the scum discharge port 2a.

In the scum collection device 1 having the above structure, 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 from the scum supply port 2b to the scum separation tank 2 by the action of the air-driven diaphragm pump 9 installed therein. Since it is difficult to collect only the scum 11a by the float suction 6, part of the coolant 11b is also supplied to the scum separation tank 2 when the scum 11a is supplied from the coolant tank 5 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 reduced.
Among the scum 11a and the 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 bubbles having a predetermined thickness on the liquid surface of the coolant 11b. . On the other hand, the coolant 11b is discharged to the outside of the scum separation tank 2 from the coolant discharge port 2c. The scum 11a is less likely to mix with the discharged coolant 11b. In the scum recovery device 1, only the scum 11a that has reached the height of the scum discharge port 2a out of the scum 11a floating on the liquid surface of the coolant 11b overflows the scum separation tank 2 and is stored in the scum tank 10. Therefore, the amount of coolant 11b discharged together with the scum 11a from the scum discharge port 2a can be reduced. The coolant 11b discharged to the outside of the scum separation tank 2 from the coolant discharge port 2c is returned to the coolant tank 5.
Thus, in the scum recovery device 1, the coolant 11b is hardly discharged when the scum 11a is discharged from the scum discharge port 2a, and the scum 11a is discharged when the coolant 11b is discharged from the coolant discharge port 2c. Therefore, the ratio of scum 11a separated from 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 adjusting mechanism 3 includes a coolant discharge pipe 12a having one end connected to the coolant discharge port 2c of the scum separation tank 2 and the other end provided with a nut 13a, and a A coolant discharge pipe 12b provided with a nut 13b and a cylindrical joint 14 connecting the coolant discharge pipes 12a and 12b are provided. The ends of the coolant discharge pipes 12a and 12b protrude beyond the nuts 13a and 13b, and the nuts 13a and 13b whose one ends are closed have openings on the protruding ends of the coolant discharge pipes 12a and 12b. The coolant discharge pipes 12a and 12b are attached to the outer peripheral surfaces of the coolant discharge pipes 12a and 12b so that their respective cylindrical axes coincide with each other. The joint 14 is provided with male threaded portions 14a, 14a on its outer peripheral surface for screwing into the female threaded portions of the nuts 13a, 13b. It has a structure that can be screwed between the nuts 13b.
When the joint 14 is rotated in one direction with both ends of the male screw portions 14a, 14a screwed between the coolant discharge pipe 12a and the nut 13a and between the coolant discharge pipe 12b and the nut 13b, respectively, the coolant discharge pipe 12a and nut 13a and coolant discharge pipe 12b and nut 13b are simultaneously moved away from joint 14 and joint 14 is rotated in the other direction, coolant discharge pipe 12a and nut 13a and coolant discharge pipe 12b and nut 13b are formed to move toward the joint 14 at the same time.
Seal packings 15 are installed inside the nuts 13a and 13b so as to be externally inserted into the coolant discharge pipes 12a and 12b.
Furthermore, a coolant discharge pipe 12c is connected via a connector 16 to the upper end of the coolant discharge pipe 12b (the end not connected to the joint 14). 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 base end of the L-shaped coolant discharge pipe 12c is connected to the connector 16 with the open end directed downward.

The scum overflow level adjusting 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 portion of the inner surface of the coolant discharge pipe 12c is adjusted. and the lower surface (lowest portion of the inner surface) of the scum discharge port 2a of the scum separation tank 2 has a structure in which the height relationship 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 the scum separation tank 2 coincides with the height of the liquid surface of the coolant 11b (broken line X shown in FIG. 1(a)). That is, in the scum overflow level adjustment mechanism 3, the coolant discharge pipes 12a to 12c constitute overflow pipes, and the joint 14 moves the coolant discharge pipe 12b vertically by rotation, thereby changing the length of the overflow pipe. It constitutes a thickness adjusting means. The scum overflow level adjusting 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.
When the liquid level of the coolant 11b in the scum separation tank 2 becomes higher than the lowest portion of the inner surface of the scum discharge port 2a, the coolant 11b may be discharged from the scum discharge port 2a together with the scum 11a. 1, by rotating the joint 14 to change the length of the overflow pipe composed 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 recovery 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. Therefore, the discharge of the coolant 11b from the scum discharge port 2a is prevented, and the scum 11a is removed. Efficient discharge from the scum separation tank 2 is possible.

As shown in FIGS. 2(a) and 2(b), the scum separation tank 2 has a substantially rectangular parallelepiped shape with an upper opening, and a rectangular opening 17a (see FIG. 2(b)) provided at the upper end of the side plate 2d. ) and an enclosure 17b extending obliquely downward from the edge of the opening 17a (see FIG. 2(b)) form the scum discharge port 2a.
A pair of side plates 2e, 2e perpendicular to the side plate 2d are provided with two insertion holes 2h (see FIG. 4(a)) for bolts 18 for fixing the overflow shutter mechanism 4, respectively. The scum introduction pipe 7b, whose lower end is connected to the scum supply port 2b provided in 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 portion of the side plate 2f facing the side plate 2d provided with the scum discharge port 2a. have a function.
As described above, in the scum recovery apparatus 1, the scum 11a supplied from the scum supply port 2b to the scum separation tank 2 is discharged through the scum introduction pipe 7b to a location distant from the scum discharge port 2a. A situation in which the liquid level of the coolant 11b fluctuates in the vicinity of the scum discharge port 2a due to the influence of the supplied scum 11a is unlikely to occur. As a result, 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 exhibited. In addition, the scum 11a newly discharged from the scum introduction pipe 7b at a position opposite to the position where the scum discharge port 2a is provided is shown by an arrow B in FIG. while pushing up from the scum discharge port 2a. The scum 11a has the property of being solidified by a chemical reaction when it stays inside the scum separation tank 2 for a long time. Since the solidified scum 11a has poor fluidity, it is difficult to discharge 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. As a result, solidification of the scum 11a is prevented, and the scum 11a becomes dense in the vicinity of the scum discharge port 2a, thereby increasing the amount of the scum 11a discharged from the scum discharge port 2a per unit time. On the other hand, the amount of coolant 11b discharged together with the scum 11a from the scum discharge port 2a decreases. Furthermore, since the range in which the scum 11a is discharged from the scum introduction pipe 7b is limited, the above-described effect that the scum 11a is less likely 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 comprises 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.
Both sides of the thin plate of the shutter 19 are bent perpendicularly in the same direction to form a pair of mounting portions 19a, 19a which are rectangular in plan view and parallel to each other, and a flat plate portion 19b which is substantially rectangular in plan view. ing. A pair of elongated holes 19c, 19c through which the bolt 18 can be inserted is formed in the mounting portion 19a in parallel with the longitudinal direction, and the upper end 19d of the flat plate portion 19b is V-shaped in plan view. .
The fixing member 20 is made by bending both ends of an elongated plate perpendicularly in the same direction, and is formed with a pair of parallel bent portions 20a, 20a and a connecting portion 20b connecting 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. 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 mounting portions 19a, 19a, and the fixture 20 is attached to the pair of mounting portions 19a, 19a by the pair of bent portions 20a, 20a. can be arranged between a pair of mounting portions 19a, 19a in a parallel state (see FIG. 3(a)). The pair of bolt holes 20d, 20d are positioned so that two bolts 18 inserted through the pair of elongated holes 19c, 19c can be simultaneously screwed when the fixture 20 is arranged inside the shutter 19. formed.
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 of the flat plate portion 19b is arcuate or linear as shown in FIGS. 3(d) and 3(e).

In the shutter 19, the distance between the outer surfaces of the pair of mounting portions 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 arranged between a pair of side plates 2e, 2e. Therefore, when the bolt 18 inserted through the long hole 19c and screwed into the bolt hole 20d of the fixture 20 is tightened, the attachment part 19a is bent from both sides by the bent part 20a of the fixture 20 and the side plate 2e of the scum separation tank 2. The position is held by pinching. In this manner, the shutter 19 is fixed to the scum separation tank 2 using the bolt 18 and the fixture 20. At this time, the flat plate portion 19b of the shutter 19 comes into contact with the inner surface of the side plate 2d of the scum separation tank 2. A side plate 2e of the scum separation tank 2 is provided with an insertion hole 2h for the bolt 18 so as to be in a closed state. In the state shown in FIG. 4(b), when the bolt 18 is loosened, the shutter 19 can move vertically within the range in which the bolt 18 can move inside the long hole 19c, and the shutter 19 can be moved to the highest position. Then, the upper end 19d protrudes from the lower surface of the scum discharge port 2a. That is, the shutter 19 is slidable in the vertical direction along the side plate 2d, and is installed so that the upper end 19d can protrude above the lower surface of the scum discharge port 2a. At this time, the bolt 18 and the fixture 20 function as 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 object to be processed by bonder treatment, the surface tension of the object varies depending on the method and equipment for processing the object. In particular, in the case where the lower surface of the scum discharge port 2a is processed to have an arc shape in a side view or in the case where there is a welded layer, the difference in the surface tension of the scum 11a becomes conspicuous. There is a difference in fluidity of the scum 11a at the welded 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 recovery device 1 having the overflow shutter mechanism 4, the difference in the surface force of the scum 11a is difficult to appear at the upper end 19d of the shutter 19 made of a thin plate. It is difficult for the phenomenon that a difference arises to occur.
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.
As described above, in the scum recovery device 1, the shutter 19 is operated to finely adjust the level (height) of the scum 11a that can be discharged from the scum discharge port 2a, thereby discharging the coolant 11b from the scum discharge port 2a. can be prevented. In addition, according to the scum recovery device 1, even when a curved surface portion forming an arc shape in a side view is processed on the lower surface of the scum discharge port 2a or when a welded layer portion is present, the fluidity of the scum 11a is reduced. Since the difference is less likely to occur, the scum 11a can be smoothly discharged to the outside of the scum separation tank 2 from the scum discharge port 2a.

Here, a device for recovering the oil (floating oil) mixed in the liquid of the coolant and floating on the liquid surface will be described with reference to FIG. 5 . FIG. 5(a) is a schematic diagram of a conventional floating oil recovery device, and FIG. 5(b) is an external view of a floating oil overflow level adjusting mechanism in FIG. 5(a).
As shown in FIG. 5(a), the floating oil recovery device 50 is provided with a floating oil discharge port 51a to which a floating oil discharge pipe 52a is connected and a coolant discharge port 51c to which a coolant discharge pipe 52c is connected. , a floating oil separation tank 51 having a bottom plate 51d provided with a floating oil supply port 51b to which a 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 so as to separate the primary tank provided with the floating oil discharge port 51a and the secondary tank provided with the coolant discharge port 51c. A floating oil overflow level adjusting 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 adjusting mechanism 53 includes a floating oil discharge pipe 52b having a male threaded portion 54a at its 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 peripheral surface. The floating oil discharge pipe 52b is installed inside the floating oil separation tank 51 so that the cylindrical axis of the adjusting socket 55 is parallel to the vertical direction.

In the floating oil recovery device 50 having the above structure, the floating oil 11c is supplied from the floating oil supply port 51b through the floating oil introduction pipe 52d into the floating oil separation tank 51 and the coolant 11b. floats in the liquid of the coolant 11b in the primary tank and then accumulates on the liquid surface of the coolant 11b, whereas part of the coolant 11b passes below the partition plate 51e from the primary tank side to the secondary tank side. Moving. Of the floating oil 11c 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 through the floating oil discharge port 51a and the floating oil discharge pipe 52a to the floating oil separation tank. 51 is discharged to the outside. When the liquid level of the coolant 11 b exceeds the height of the upper end 55 a of the adjust socket 55 , the coolant 11 b flows into the adjust socket 55 until the liquid level matches the height of the upper end 55 a of the adjust socket 55 . The coolant 11b that has flowed into the adjust 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 adjust socket 55. are screwed together, the height of the upper end 55a changes when the adjusting socket 55 is rotated. 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 to change the height of the upper end 55a. It's becoming In addition, when the liquid level of the coolant 11b exceeds the height of the coolant discharge port 51c in the secondary tank, the coolant 11b is kept at the coolant discharge port 51c until the liquid level of the coolant 11b matches the height of the coolant discharge port 51c. to 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 insert a hand into the layer of the scum 11a to rotate the adjustment socket 55. , the function of the floating oil overflow level adjusting mechanism 53 may not be exhibited. In addition, since the inside of the adjust socket 55 is immediately 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 well-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 as in the scum recovery device 1 of the present invention. It is considered difficult to

6(a) and 6(b) are respectively a plan view and a side view of the float suction shown in FIG. 1(a), and FIG. 6(c) is shown in FIGS. FIG. 4 is an external perspective view of a scum inflow amount adjusting mechanism in the float suction shown; 6(d) and 6(e) are external perspective views of the shutter ring and the suction cup shown in FIG. 6(c), respectively. 7(a) is a cross-sectional view taken along 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). It is a diagram showing. 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 in the direction of arrow D in FIG. 6(c), and FIG. 9(b) shows a state in which the shutter ring moves in the circumferential direction with respect to the suction cup in FIG. 9(a). It is a diagram. 10(a) and 10(b) are respectively a plan view and a side view of a modification of the float suction shown in FIGS. 6(a) and 6(b), and FIG. FIG. 10(d) is a cross-sectional view taken along line EE in FIG. 10(c). FIG.
6(c) to 6(e) show the shutter ring and the suction cup in an enlarged state compared to the states shown in FIGS. 6(a) and 6(b), and FIGS. 7 to 9. shows the shutter ring and the suction cup in a state further enlarged than the states shown in FIGS. 6(c) to 6(e). 6(a), 9(b) and 9(b), cutouts are provided in order to facilitate identification of a portion provided with a notch and a portion not provided with a notch. The parts not covered are hatched. Furthermore, FIGS. 8A and 8B schematically show the scum in an enlarged state compared to the case shown in FIG. 2B. 10(c) and 10(d) show the suction cup in an enlarged state compared to the state shown in FIGS. 10(a) and 10(b), and FIG. In order to make it easier to distinguish between the cut-out portion and the cut-out portion, the cut-out portion is hatched.
As shown in FIGS. 6(a) and 6(b), the float suction 6 includes a cylindrical suction cup 21 having a bottom surface 21a provided with a suction port 6a, and a suction cup 21 having a constant inner and outer diameter. A shutter ring 22 installed on the top of the suction cup 21, a mesh-like dustproof cover 23 installed so as to cover the top of the suction cup 21, and four arm portions 24a. A connector 24 whose central portion is fixed to the bottom surface 21a of the suction cup 21, and a columnar shape, an insertion hole for a float fixing bolt 26 are coaxially provided and erected at the tip of the arm portion 24a. A float fixing bolt that has a spacer 25 and a mounting portion 27a having a bolt hole provided at the upper end portion of the spacer 25, and communicates with the insertion hole provided at the tip of the arm portion 24a and the insertion hole of the spacer 25. A 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 is provided with an annular groove 21d in which an O-ring 28 is installed on its outer peripheral surface. The small-diameter portion 21b has a stepped structure consisting of a small-diameter portion 21b and a large-diameter portion 21c. Notches 21f are provided at substantially equal intervals in the circumferential direction. Inside the suction cup 21, a large-diameter portion 21g is provided on the side of the end surface 21e, and a small-diameter portion 21h is provided on the side of the bottom surface 21a. is formed as
On the other hand, the shutter ring 22 is a cylindrical body having an inner diameter larger than that of the small diameter portion 21b of the suction cup 21 and an outer diameter substantially equal to that of the large diameter portion 21c of the suction cup 21. Four cutouts 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 externally inserted into the small diameter portion 21b of the suction cup 21 (see FIG. 6(c)). The length of the O-ring 28 protruding from the annular groove 21d toward the radially outer side of the suction cup 21 when the shutter ring 22 is not attached to the suction cup 21 is equal to the inner diameter of the shutter ring 22 and the suction cup. 21 is longer than 1/2 of the difference from the outer diameter of the small diameter portion 21b. That is, when the shutter ring 22 is fitted over 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 pushed radially inward of the suction cup 21 by the shutter ring 22. A large frictional force is generated between the O-ring 28 and the inner surface of the shutter ring 22 due to the crushed state. That is, in the float suction 6, the shutter ring 22 is movable in the vertical direction and the circumferential direction with respect to the suction cup 21, but the frictional force generated between the shutter ring 22 and the O-ring 28 causes the shutter ring 22 has a structure in which the position with respect to the suction cup 21 is held.
That is, the O-ring 28 closes the gap between the outer surface of the suction cup 21 and the inner surface of the shutter ring 22 and has the function of holding the shutter ring 22 against the suction cup 21 so as not to move unexpectedly. 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 the possibility of the scum 11a flowing out is low, the installation of the O-ring 28 can be omitted. Further, the suction cup 21 does not have to be cylindrical as a whole, and at least the upper part to which the shutter ring 22 is fitted may be cylindrical.

In the float suction 6, 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 when the shutter ring 22 is viewed from the side. 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 and 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 portion. 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 is easily changed.
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 of the coolant tank 5. , or lower. Therefore, according to the float suction 6 having such a structure, as shown in FIG. is higher than the liquid level L of the coolant 11b in the coolant tank 5, the inflow of the coolant 11b into the suction cup 21 can be suppressed.

As already described, 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 arrow s in FIGS. 9A and 9B) is changed by rotating the shutter ring 22 around 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 increases, and decreases as the overlapping portion decreases. Therefore, according to the scum collection device 1 having the float suction 6, by operating the shutter ring 22, the amount of scum 11a flowing into the suction cup 21 can be easily adjusted.
Thus, the float suction 6 has a structure in which the inflow amount of the scum 11a into the suction cup 21 can be easily controlled by moving the shutter ring 22 vertically or rotating with respect to the suction cup 21. ing. It is desirable that a drop of 15 mm or more be formed between the liquid surface of the coolant 11b in the coolant tank 5 and the uppermost portion of the scum 11a in the suction cup 21.

As shown in FIGS. 10(a) and 10(b), the float suction 29 sucks into the bottom surface 30a instead of the suction cup 21, the shutter ring 22, the connector 24, the spacer 25 and the O-ring 28 in the float suction 6. It is characterized by comprising a cylindrical suction cup 30 provided with a mouth 6a, a buoyancy adjusting weight 31, a connector 32 and a locking nut 33. Although the dustproof cover 23 is not shown in FIGS. 10A and 10B, the float suction 29 may have a structure including the dustproof cover 23. FIG.
A connector 32 made of a flat plate provided with three arm portions 32a has a central 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 The float 27 is fixed to the connector 32 by screwing a float fixing bolt 26 into the bolt hole of the mounting portion 27a. A locking nut 33 is attached to the float fixing bolt 26 so as to abut on the lower end of the attaching portion 27a. It is installed on the upper surface of 32.
As shown in FIGS. 10(c) and 10(d), the suction cup 30 has three notches 30c having a desired depth in the axial direction of the cylinder and a desired width in the circumferential direction from the end face 30b. They are provided at approximately equal intervals in the circumferential direction. Inside the suction cup 30, a large-diameter portion 30d is provided on the side of the end surface 30b, and a small-diameter portion 30e is provided on the side of the bottom surface 30a. is formed as

In the float suction 29 having such a structure, the scum 11 a stored in the coolant tank 5 flows into the suction cup 30 through the notch 30 c 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 adjusting 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, it is difficult to keep the float suction 29 horizontal by adjusting the screwing length of the float 27 into the mounting portion 27a for each of the three float fixing bolts 26 . Further, fine adjustment of the weight of the buoyancy adjusting weight 31 is difficult. Therefore, it is not easy to adjust the amount of scum 11 a flowing into the suction cup 30 with the float suction 29 .
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 the direction F in FIG. 11(a) It is an arrow view. 12(a) and 12(b) are a cross-sectional view taken along line GG in FIG. 11(a) and a view taken along line H in FIG. 11(b), respectively. FIG. 13(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 FIG. FIG. 10 is a diagram showing a state in which the In addition, in FIG. 11(a), in order to make it easier to distinguish between the part with the notch and the part without the notch, the part without the notch is hatched. 12(a) shows an enlarged state from the case shown in FIG. 11(a). 13(a) and 13(b), the side plate and the bottom plate of the coolant tank are partially hatched to indicate a cross section. 6 and 7 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.
The float suction 6 shown in FIGS. 11(a) and 11(b) and FIGS. 12(a) and 12(b) has a suction cup 34 instead of the suction cup 21. FIG. The suction cup 34 has a structure in which a pair of suction ports 6a, 6a are provided on a lower side surface 34a instead of the suction port 6a of the float suction 6 on the bottom surface 21a of the suction cup 21 (Fig. 12(a)). )reference). Instead of the scum suction pipe 7a, as shown in FIG. 11(a), a scum suction pipe 35 whose tip end is branched into two using a Y-shaped joint 37 rotates with respect to the pair of suction ports 6a, 6a. They are connected through a pair of rotary joints 36, 36 installed so that their axes are perpendicular to the cylindrical axis of the suction cup 34, respectively.

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, as shown in FIG. , and the float suction 29 can only be lowered to a predetermined height. Further, when part of the scum suction pipe 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 pipe 7a from the bottom surface 5a of the coolant tank 5 is applied via the scum suction pipe 7a. is transmitted to the suction cup 30. As a result, the suction cup 30 tilts and a large amount of coolant 11 b flows into the suction cup 30 . On the other hand, in the float suction 6 shown in FIGS. 11 and 12, the suction port 6a of the float suction 6 is provided on the lower side surface 34a of the suction cup 34, and the suction port 6a of the scum suction pipe 35 is provided. 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 is lowered. Also, the portion of the scum suction pipe 35 connected to the suction port 6a rotates about the rotation axis of the rotary joint 36, so that the float suction 6 descends and a part of the scum suction pipe 35 reaches the bottom surface of the coolant tank 5. Even if the scum suction pipe 35 comes into contact with the bottom surface 5a of the coolant tank 5, the force that the scum suction pipe 35 receives from the bottom surface 5a is small, so that the force hardly causes the suction cup 34 to tilt. Therefore, in the scum recovery device 1 equipped with the float suction 6 having the structure described above, the liquid level L of the coolant 11b of the coolant tank 5 (see FIG. The float suction 6 can function even when lowered to a lower position than when provided on the bottom surface. Also, even when the float suction 6 descends, the force received by the scum suction pipe 7a from the bottom surface 5a of the coolant tank 5 acts to incline the suction cup 34, causing a large amount of coolant 11b to flow into the suction cup 34. This situation can be prevented. Furthermore, since the scum suction pipe 35 is connected via a rotary joint 36 to the suction port 6a of the float suction 6 which is provided symmetrically on the horizontal axis at the center of the lower portion of the suction cup 34, 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 surface L of the coolant 11b (see FIG. 13(b)) and the lower surfaces of all the notches 21f in the suction cup 34 are always kept parallel. drip. That is, in the float suction 6, the suction cup 34 follows fluctuations in the liquid level L of the coolant 11b in the coolant tank 5 (see FIG. 13(b)). It is possible to collect.
In existing machine tools, the tank equivalent to the coolant tank 5 is often shallow. 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 scum inflow amount adjusting mechanism to a float suction in a scum recovery device according to a second embodiment of the present invention, and FIGS. Fig. 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 respectively a cross-sectional view taken along line JJ in FIG. 14(b) and a cross-sectional view taken along line KK in FIG. 14(c). FIG. 15(a) is a cross-sectional view taken along the line II in FIG. 14(a), and FIG. 15(b) shows the float shutter and the levitation aid in FIG. It is the figure which showed the state which moved. 15(a) and 15(b) show the suction cup in a state expanded more than the case shown in FIG. 14(a), and the scum expanded more than the case shown in FIG. 2(b). It is schematically shown in the state. 6 to 8 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.
In the scum recovery apparatus of this embodiment, the scum inflow amount adjustment mechanism in the float suction 6 in the scum recovery apparatus 1 described in the first embodiment is replaced with the suction cup 21, the shutter ring 22 and the O-ring 28, but with a suction cup 38 and a float shutter. 39 and a floating support member 40 are provided.
As shown in FIGS. 14(a), 14(b) and 14(e), the suction cup 38 is a cylindrical body having a bottom surface 38a provided with a suction port 6a. Four cutouts 38c having a desired depth and a desired width in the circumferential direction are provided at approximately equal intervals in the circumferential direction. Inside the suction cup 38, a large-diameter portion 38d is provided on the side of the end surface 38b, and a small-diameter portion 38e is provided on the side of the bottom surface 38a. The suction cup 38 has a constant inner diameter at the large-diameter portion 38d, but is formed such that the inner diameter decreases once at the terminal end of the large-diameter portion 38d and then gradually decreases toward the small-diameter portion 38e. .
As shown in FIGS. 14(c) and 14(f), the float shutter 39 is formed of a cylindrical body with a constant outer diameter, and has an inclined portion inside of which 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, which has the smallest inner diameter, and the end surface 39b. The large diameter portion 39d is formed to have an inner diameter larger than the inner diameter of the terminal end of the inclined portion 39c.
As shown in FIG. 14(d), the levitation aid 40 has a cylindrical shape whose outer diameter is smaller than the inner diameter of the large diameter portion 39d of the float shutter 39 and larger than the inner diameter of the terminal end of the inclined portion 39c. It is formed of a member having a smaller specific gravity than 11b. That is, the auxiliary floating member 40 can be installed inside the large-diameter portion 39d of the float shutter 39, and when the auxiliary floating member 40 is inserted into the float shutter 39 from the end surface 39b side, the end surface 40a reaches the terminal end of the inclined portion 39c. (See FIG. 15(a) or FIG. 15(b)).

In the scum recovery device having the above structure, when the coolant 11b flows into and accumulates in the suction cup 38, buoyancy is generated in the auxiliary floating member 40, so the float shutter 39 moves upward inside the suction cup 38 together with the auxiliary floating member 40. . At this time, the amount of movement of the float shutter 39 is determined by the magnitude of the buoyant force generated in the floating auxiliary member 40, so the amount of movement is affected by the amount of coolant 11b accumulated in the suction cup 38. FIG. That is, in the scum recovery device having the above structure, the length by which the end face 39a of the float shutter 39 protrudes 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 face 39a of the float shutter 39 protrudes above the notch 38c of the suction cup 38, the liquid surface L of the coolant 11b of the coolant tank 5 will reach the end face 39a of the float shutter 39. , the amount of coolant 11b flowing into the suction cup 38 does not increase significantly. As already described, the length by which the end surface 39a of the float shutter 39 protrudes above the notch 38c of the suction cup 38 changes according to 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, as shown in FIG. The amount of coolant 11b flowing into the suction cup 38 is suppressed. That is, according to the scum recovery device of the present embodiment, when the amount of coolant 11b flowing into the suction cup 38 increases, the end surface 39a of the float shutter 39 protrudes above the lower surface of the notch 38c of the suction cup 38. , the inflow of the coolant 11b into the suction cup 38 is suppressed.
Thus, in the scum recovery device 1 of this embodiment, a desired drop 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 collecting apparatus of the present invention is not limited to the structures shown in the first and second embodiments. For example, an electric pump can be used instead of the air-driven diaphragm pump 9 . Also, the scum supply port 2b and the coolant discharge port 2c may be provided on the bottom of the side plates 2d to 2f of the scum separation tank 2 or on the bottom plate 2g.

The scum recovery device of the present invention is a foamy scum generated from working fluid (oil) used for lubrication and cooling in primary processing (molding by forging, forging, etc.) and secondary processing (finishing by grinding) in machine tools. It can be used when separating and collecting floating objects.

REFERENCE SIGNS LIST 1 scum recovery device 2 scum separation tank 2a scum discharge port 2b scum supply port 2c coolant discharge port 2d to 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 to 12c ... Coolant discharge pipe 13a, 13b ... Nut 14 ... Joint 14a ... Male threaded portion 15 ... Seal packing 16 ... Connector 17a ... Opening 17b ... Enclosure 18 ... Bolt 19 ... Shutter 19a ... Mounting portion 19b ... Flat plate portion 19c ... Long hole 19d Upper end 20 Fixing tool 20a Bent portion 20b Connecting portion 20c Reinforcing portion 20d Bolt hole 21 Suction cup 21a Bottom surface 21b Small diameter portion 21c Large diameter portion 21d Annular groove 21e End surface 21f Notch 21g Large diameter portion 21h Small diameter portion 22 Shutter ring 22a End surface 22b Notch 23 Dustproof cover 24 Connector 24a Arm 25 Spacer 26 Float fixing bolt 27 Float 27a Mounting portion 28 O Ring 29 Float suction 30 Suction cup 30a Bottom surface 30b End surface 30c Notch 30d Large diameter portion 30e Small diameter portion 31 Buoyancy adjustment weight 32 Connector 32a Arm portion 33 Locking nut 34 Suction cup 34a Lower side surface 35 Scum suction pipe 36 Rotary joint 37 Y-shaped joint 38 Suction cup 38a Bottom surface 38b End surface 38c Notch 38d Large diameter portion 38e Small diameter portion 39 Float shutter 39a, 39b End surface 39c... Inclined part 39d... Large diameter part 40... Floating auxiliary member 40a... End face 50... Floating oil recovery device 51... Floating oil separation tank 51a... Floating oil discharge port 51b... Floating oil supply port 51c... Coolant discharge port 51d... Bottom plate 51e Partition plates 52a, 52b Floating oil discharge pipe 52c Coolant discharge pipe 52d Floating oil introduction pipe 53 Floating oil overflow level adjustment mechanism 54a Male screw portion 54b Female screw portion 55 Adjust socket 55a Upper end

Claims (7)

A scum recovery device for separating and recovering scum from coolant used for lubricating and cooling machined parts in a machine tool,
a coolant tank in which the coolant is stored together with the scum;
A float made of a member having a lower specific gravity than the coolant is attached, and installed in the coolant tank so as to float on the coolant surface so that the scum floating on the coolant surface flows into the interior. float suction and
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 for delivering the scum from the float suction to the scum separation tank via the scum suction pipe,
A scum recovery device, wherein the scum discharge port and the scum supply port are provided at upper and lower portions of the scum separation tank, respectively, and the coolant discharge port is provided at a position lower than the scum discharge port. a shutter made of a thin plate, slidable in the vertical direction along the side plate of the scum separation tank provided with the scum discharge port, and installed so that the upper end thereof can protrude above the lower surface of the scum discharge port; ,
2. The scum recovery apparatus according to claim 1, further comprising 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;
and length adjusting means for changing the length of the overflow pipe,
By operating the length adjusting means, 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. 3. The scum collection device according to 2. a suction cup having at least a cylindrical upper portion and a suction port provided at the lower portion so as to be connected to the opening of the upper portion;
a shutter ring having a cylindrical shape and being rotatably fitted around the upper part of the suction cup, the cylindrical axes of which are aligned with each other;
The suction cup and the shutter ring are each provided with a notch having a desired depth in a direction parallel to the cylindrical axis and having a desired width in the circumferential direction from each upper end surface. The scum collecting device according to any one of claims 1 to 3. Instead 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 smaller specific gravity than the coolant,
5. The cylindrical body according to claim 4, wherein the upper end of the cylindrical body is arranged so as to be able to protrude upward from the notch of the suction cup and to be vertically movable with respect to the suction cup. Scum collector. The suction port of the float suction is provided on the lower side surface of the suction cup,
4. The other end of the scum suction pipe is connected to the suction port via a rotary joint installed in the suction cup so that the rotary shaft is perpendicular to the cylindrical shaft. Item 6. A scum collecting device according to Item 5. A scum introduction pipe having one end connected to the scum supply port,
The scum introduction pipe is installed in the scum separation tank with the other end directed to a position facing the scum discharge port provided in the scum separation tank. The scum collecting device according to any one of Claims 1 to 6.

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