JP7454312B1 - Floating object collection device - Google Patents

Abstract

[Problem] To provide a floating matter recovery device capable of efficiently recovering floating matters such as scum and oil floating on the surface of a coolant. [Solution] The floating matter recovery device 1 of the present invention comprises a scum separation tank 2 with an opening at the top and an interior divided into two spaces by a partition plate 12, a coolant tank 4 in which scum 11a and coolant 11b are stored, and a float suction 5 installed inside the coolant tank 4. The scum separation tank 2 is provided with a scum discharge port 2a below which a scum tank 9 is installed, a scum supply port 2b connected to a scum supply pipe 13, and a coolant discharge port 2c connected to a coolant discharge pipe 3. The float suction 5 has a scum cup that moves up and down by the action of an air cylinder, and one end of a scum suction pipe 6 with a filter 7 and an air-driven diaphragm pump 8 interposed therein is connected to the suction port of the float suction 5, which is floated on the surface of the coolant 11b. [Selected Figure] Fig. 1

Description

The present invention relates to a device for recovering scum (foam-like floating scum) and oil mixed into coolant (coolant) used for lubricating and cooling machining parts in machine tools, and in particular, the present invention relates to a device for recovering scum (foam-like floating scum) and oil mixed into coolant (coolant) used for lubricating and cooling machining parts of machine tools. The present invention relates to a floating object recovery device that can efficiently recover floating objects such as scum and oil that have surfaced on the surface.

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, devices for collecting floating objects such as floating oil (oil with a light specific gravity that floats on water) and scum on the liquid surface include, for example, a tank in which a mixed liquid such as floating oil and sludge is stored, and a tank installed inside the tank. a flexible hose connected to the inlet of the mixed liquid, two or more floats attached to the flexible hose so that the inlet is located at the tank liquid level, and a low water level submersible pump that fixes the floats and is connected to the inlet of the mixed liquid. Alternatively, it is equipped with a pump case that surrounds the submerged part of the coolant pump, and the mixed liquid drop port is lower than the water level in the pump case so that the mixed liquid flows into the pump case at atmospheric pressure from the mixed liquid drop port connected to the flexible hose. Patent Document 1 discloses a recovery device structured to be held at a high position.

With such a structure, oil and sludge floating on the liquid surface can be efficiently suctioned by following liquid level fluctuations. However, in this recovery device, a low water level submersible pump or a coolant pump is operated to raise the mixed liquid falling port to a position higher than the water level inside the pump so that the mixed liquid flows from the mixed liquid falling port into the pump case at atmospheric pressure. It is difficult to operate because it needs to be maintained.
Additionally, even if the liquid level in the tank fluctuates, a float is installed on the flexible hose so that the mixed liquid inlet of the flexible hose moves up and down to follow the fluctuations, but the liquid level in the tank moves downward. However, if a sufficient head distance between the mixed liquid inlet and the mixed liquid falling port of the flexible hose is not ensured, there is a problem that the mixed liquid stops flowing into the mixed liquid inlet.
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 is a risk.

To address these issues, for example, Patent Document 2 discloses an invention entitled "Scum Recovery Device" that relates to a device that efficiently separates and recovers scum floating on the surface of the coolant from the coolant. ing.
The invention disclosed in Patent Document 2 includes a scum separation tank in which a scum discharge port is provided at the top and a scum supply port and a coolant discharge port are provided at the bottom, and a scum overflow level adjustment mechanism connected to the coolant discharge port. , a coolant tank in which coolant is stored together with scum, a float suction installed inside the coolant tank, an overflow shutter mechanism installed at the scum discharge port, and one end connected to the scum supply port and a float at the other end. It is characterized by comprising a scum suction pipe connected to the suction port of the suction, a filter and an air-driven diaphragm pump interposed in the scum suction pipe, and a scum tank installed below the scum discharge port. .

Further, Patent Document 3 discloses an invention called "Surface Liquid Recovery Apparatus" that relates to an apparatus for recovering surface liquid containing machine oil, foreign matter, etc. floating on the surface of the liquid.
The invention disclosed in Patent Document 3 includes a cylindrical and bellows-shaped telescopic member, an annular float installed at the upper end of the telescopic member, and a bottom plate member that closes the bottom surface of the telescopic member. The structure is such that the surface liquid flowing into the tank is sequentially transferred from a discharge pipe to a separation tank by driving a pump.
In the recovery device having the above structure, if the surface liquid accumulated in the elastic member does not reach the float, the elastic member is in a contracted state due to its own weight and the weight of the float. On the other hand, when the surface liquid accumulated in the elastic member reaches the upper part of the float, the float rises together with the surface liquid level due to the buoyant force that the float receives from the surface liquid. In this case, the expandable member having the float installed at its upper end also expands to follow the rise of the float. Then, as the surface liquid in the telescopic member is transferred to the separation tank via the discharge pipe, the surface liquid level in the telescopic member falls, and as a result, the float follows and descends, causing the telescopic member to rise again. Becomes in a contracted state.
In this way, the invention disclosed in Patent Document 3 is such that a fixed amount of liquid flows into the elastic member by repeating contraction and expansion at a predetermined period according to the amount of surface liquid accumulated inside the elastic member. become. Therefore, in the invention disclosed in Patent Document 3, it is possible to sequentially collect a certain amount of surface liquid accumulated in the elastic member.

JP2013-230458A JP 2023-50812 A Japanese Patent Application Publication No. 2014-12245

A large amount of coolant fluid in grinding machines is consumed due to adhesion to workpieces, etc. For example, if a grinding machine is operated for 24 hours, the liquid level in the coolant tank may drop by 10 cm or more. Furthermore, when a large amount of coolant return liquid is returned from the scum separation tank into the coolant tank, the liquid level in the coolant tank fluctuates drastically.
In the invention disclosed in Patent Document 2, the suction cup is floating in the coolant in the coolant tank, so if the liquid level in the coolant tank changes significantly or fluctuates violently, the suction cup will be damaged. There was a risk that it would easily tip and allow more coolant than necessary to flow into it.

Furthermore, in order to efficiently collect scum from the coolant, it is necessary to adjust the height of the inflow surface of the suction cup relative to the liquid level in the coolant tank. It was difficult to adjust the height of the inflow surface of the cup, and there was room for improvement.
In the invention disclosed in Patent Document 3, it is necessary to fix the bottom plate member to the liquid tank, and if the liquid tank is large, it has to be installed near the side plate, and cannot be installed far from the side plate. There was a problem. Further, when installing or removing the liquid tank, it is necessary to perform work such as fixing the bottom plate member to the liquid tank or removing the bottom plate member from the liquid tank, resulting in poor work efficiency.

The present invention has been made in response to such conventional circumstances, and provides a floating object recovery device that can efficiently recover floating objects such as scum and oil floating on the surface of a coolant. The purpose is to

In order to achieve the above object, a first invention is a floating object collection device for collecting floating objects such as scum and oil floating on the liquid surface of a coolant used for lubricating and cooling machining parts in a machine tool, It has a coolant tank in which coolant is stored together with floating objects, and a float made of a member with a specific gravity smaller than that of the coolant, and the floating objects floating on the coolant surface are floated on the coolant surface so that they flow into the inside. A float suction installed in the coolant tank in this manner, a floating object separation tank having a floating object discharge port, a floating object supply port, and a coolant discharge port, and one end connected to the floating object supply port of the floating object separation tank. The float suction is equipped with a floating object suction pipe whose other end is connected to the suction port of the float suction, and a pump that sends the floating objects from the float suction to the floating object separation tank via the floating object suction pipe. , a connecting plate to which a float is connected, an air cylinder installed on the connecting plate with the tip of the piston rod pointing downward, and a suction port provided at the bottom and the tip of the piston rod opening upward. and a suction cup connected to the.

In the first invention, when the float suction is floated on the liquid surface of the coolant stored in the coolant tank, if the upper end surface of the suction cup is lower than the floating object floating on the liquid surface of the coolant, the upper end surface However, if the upper end surface of the suction cup is higher than the floating objects floating on the coolant surface, the floating objects cannot flow into the suction cup. .
Further, in the first invention, when the air cylinder is operated with the float suction floating on the coolant liquid level in the coolant tank, the suction cup moves in the vertical direction as the piston rod moves forward or backward. has.

Therefore, when the piston rod moves forward the most, the upper end surface of the suction cup becomes lower than the floating object floating on the coolant liquid surface, and when the piston rod moves back the most, the upper end surface of the suction cup becomes lower than the floating object. If you adjust the stroke of the piston rod in advance so that it is higher than the object, by operating the air cylinder so that the piston rod moves forward and backward repeatedly, after the suction cup has descended to a certain depth, The phenomenon of rising to a certain height is repeated, and each time a certain amount of floating objects flows into the suction cup. This stabilizes the amount of floating matter that is collected from the coolant tank and then supplied to the floating matter separation tank via the floating matter suction pipe.

As described above, in the first invention, since a certain amount of floating objects are collected from the coolant tank and supplied to the floating object separation tank, the floating object is separated from the coolant in a stable state in the floating object separation tank. has.
Furthermore, since the first invention has a structure in which the suction cup is moved vertically using an air cylinder, there is no need to install power equipment or electric cords near the coolant tank, unlike when using an electric cylinder. . Therefore, in the first invention, even if the coolant is water-soluble, there is no risk of accidents such as short circuits and electric shocks.

A second invention is characterized in that, in the first invention, a pneumatic circuit is provided for controlling the operation of the air cylinder so that the piston rod periodically repeats forward movement and backward movement.
In the second invention, when the piston rod moves forward the most, the upper end surface of the suction cup becomes lower than the floating object floating on the liquid surface of the coolant, and when the piston rod moves back the most, the upper end surface of the suction cup becomes lower than the surface of the suction cup. After adjusting the stroke of the piston rod in advance so that the upper end surface is higher than the floating object, operate the pneumatic circuit with the float suction floating on the liquid level of the coolant stored in the coolant tank. , the action of the first invention in which a certain amount of floating objects flows into the suction cup is repeated at a predetermined period.

A third aspect of the present invention is a first air operated valve having a first pilot port and a spring and to which compressed air is supplied via the first flow path; a second air operated valve having a third pilot port and connected to a first branch passage branching from the first passage; the second air operated valve and the first cylinder port of the air cylinder; and a second flow path and a third flow path that respectively connect the second cylinder port, a second branch flow path that connects the third flow path and the first pilot port, and a first air flow path that connects the third flow path and the first pilot port. A first air chamber and a second air chamber are connected to the operating valve via a fourth flow path and a fifth flow path, respectively, and a sixth air chamber connects the second pilot port and the first air chamber. a seventh flow path connecting the flow path and the third pilot port to the second air chamber; a first pressure control valve and a seventh pressure control valve interposed in the sixth flow path and the seventh flow path, respectively; 2 pressure control valve, the first air operated valve causes the first flow path and the fourth flow path to communicate with each other when the first pilot pressure acts on the first pilot port, and the first air operated valve communicates with the fifth flow path. From the first state in which the compressed air in the flow path is released into the atmosphere, the first flow path and the fifth flow path communicate with each other, and the compressed air in the fourth flow path is released into the atmosphere. On the other hand, when the first pilot pressure no longer acts on the first pilot port, the second state is switched to the first state due to the biasing force of the spring, and the second air operated valve is switched to the first state. When the second pilot pressure acts on the second pilot port, the first branch flow path and the second flow path communicate with each other, and the compressed air in the third flow path and the second branch flow path is released. Switches from the third state in which air is released into the atmosphere to the fourth state in which the first branch flow path and the third flow path communicate with each other and the compressed air in the second flow path is released into the atmosphere. On the other hand, when the third pilot pressure acts on the third pilot port, the fourth state is switched to the third state.
Note that the first to seventh channels, the first branch channel, and the second branch channel in the third invention are air tubes that will be described later as Example 1 in the mode for carrying out the invention. 33a, 33d, 33e, 33b, 33c, 33f, 33g, and the first branch tube 34a and second branch tube 34b, respectively.

In the third invention, the head side port and rod side port of the air cylinder are the first cylinder port and the second cylinder port, respectively, and the first air operated valve and the second air operated valve are the first cylinder port, respectively. state and the third state, the compressed air supplied to the second air operated valve via the first flow path and the first branch flow path passes through the second flow path to the head of the air cylinder. As the piston rod of the air cylinder moves forward, the compressed air discharged from the rod side port is supplied to the second air operated valve via the third flow path and then released into the atmosphere. is released.

On the other hand, the compressed air supplied from the first flow path to the first air operated valve flows into the first air chamber through the fourth flow path. After the compressed air leaves the first air chamber when the pressure in the first air chamber increases and reaches a value indicative of a preset pressure (pilot pressure) for the first pressure control valve. , is supplied to the second pilot port of the second air operated valve. Then, as a result of this compressed air acting as a second pilot pressure on the second air operated valve, the second air operated valve is switched from the third state to the fourth state.

When the second air operated valve enters the fourth state, the first branch channel and the third channel communicate with each other in the second air operated valve. The compressed air supplied to the air cylinder is supplied to the rod side port of the air cylinder through the third flow path. As a result, the piston rod retreats, and the compressed air discharged from the head side port is supplied to the second air operated valve via the second flow path and then discharged into the atmosphere. Further, a portion of the compressed air supplied to the third flow path passes through the second branch flow path and is supplied to the first pilot port of the first air operated valve. Then, as a result of the compressed air supplied to the first pilot port acting as a first pilot pressure, the first air operated valve is switched from the first state to the second state.

When the first air operated valve enters the second state, the first flow path and the fifth flow path communicate with each other in the first air operated valve, so that the compressed air supplied to the first flow path is transferred to the fifth flow path. 5 into the second air chamber. When the pressure in the second air chamber increases to a value indicative of a preset pressure for the second pressure control valve, the compressed air flows out of the second air chamber and into the second air chamber. is supplied to the third pilot port of the operated valve. Then, as a result of this compressed air acting as a third pilot pressure on the second air operated valve, the second air operated valve is switched from the fourth state to the third state.

When the second air operated valve enters the third state, the first branch flow path and the second flow path communicate with each other in the second air operated valve. Therefore, the compressed air supplied from the first flow path to the first branch flow path is supplied to the head side port of the air cylinder through the second flow path, so that the piston rod moves forward again. The compressed air discharged from the rod-side port is supplied to the second air operated valve via the third flow path, and then discharged into the atmosphere.
On the other hand, since compressed air is no longer supplied from the first flow path to the third flow path and the second branch flow path, the first pilot pressure no longer acts on the first pilot port. As a result, the first air operated valve is switched from the second state to the first state by the biasing force of the spring, and the pneumatic circuit returns to the initial state.

Thus, in the third invention, in addition to the effect of the second invention, by supplying compressed air to the pneumatic circuit, the piston rod of the air cylinder repeatedly moves forward and backward at a predetermined period. . Furthermore, when the set values of the pilot pressures in the first pressure control valve and the second pressure control valve are changed, the timing at which the piston rod moves backward and the timing at which the piston rod moves forward are changed individually.

Note that in the above description of the pneumatic circuit, the head side port and rod side port of the air cylinder are referred to as the first cylinder port and the second cylinder port, respectively, but the head side port and the rod side port are respectively referred to as the second cylinder port. Even when the port and the first cylinder port are used, the effect that the piston rod of the air cylinder repeatedly moves forward and backward at a predetermined period is similarly exhibited. However, if the set values of the pilot pressures in the first pressure control valve and the second pressure control valve are respectively changed, the timing at which the piston rod moves forward and the timing at which it retreats change individually.

A fourth invention is based on the second invention, and includes an air operated valve having a pilot port and a spring and to which compressed air is supplied through a first flow path, and a first cylinder of the air cylinder and the air operated valve. A second flow path and a third flow path connecting the port and the second cylinder port, respectively, an air chamber connected to a branch flow path branching from the second flow path, and the air chamber and the pilot port. The air operated valve includes a fourth flow path that connects the fourth flow path and a pressure control valve that is installed in the fourth flow path. From the first state in which the flow paths communicate with each other and the compressed air in the third flow path is released into the atmosphere, the first flow path and the third flow path communicate with each other and the compressed air in the third flow path is released into the atmosphere. While the compressed air in the branch flow path switches to the second state in which it is released into the atmosphere, when the pilot pressure ceases to act on the pilot port, the biasing force of the spring changes the state from the second state to the first state. It is characterized by switching.
Note that the first to fourth channels and branch channels in the fourth invention are air tubes 36a, 36b, 36c, and 36d and branch air tubes, which will be described later as Example 2 in the detailed description. They correspond to the tubes 37, respectively.

In the fourth invention, when the head side port and the rod side port of the air cylinder are the first cylinder port and the second cylinder port, respectively, and the air operated valve is in the first state, the first flow path A portion of the compressed air supplied to the second passage through the air operated valve is supplied to the head side port of the air cylinder through the second passage. Therefore, as the piston rod of the air cylinder moves forward, the compressed air discharged from the rod side port is supplied to the air operated valve via the third flow path and then discharged into the atmosphere.
On the other hand, the remainder of the compressed air supplied from the first flow path to the second flow path flows into the air chamber through the branch flow path. When the pressure in the air chamber increases and reaches a value indicating the preset pressure (pilot pressure) for the pressure control valve, compressed air flows out of the air chamber and is supplied to the pilot port of the air operated valve. . This compressed air acts as pilot pressure, thereby switching the air operated valve from the first state to the second state.

When the air operated valve enters the second state, the first flow path and the third flow path communicate with each other in the air operated valve, so the compressed air supplied to the first flow path passes through the third flow path. and is supplied to the rod side port of the air cylinder. As a result, the piston rod retreats and the compressed air discharged from the head side port is supplied to the air operated valve via the second flow path and then discharged into the atmosphere.
In addition, compressed air is no longer supplied to the air chamber from the branch flow path and no pilot pressure acts on the pilot port, so the air operated valve is switched from the second state to the first state by the biasing force of the spring, and the air pressure circuit returns to its initial state.

Thus, in the fourth invention, in addition to the effect of the second invention, by supplying compressed air to the pneumatic circuit, the piston rod of the air cylinder repeatedly moves forward and backward at a predetermined period. . Furthermore, changing the set value of the pilot pressure in the pressure control valve has the effect of changing the speed at which the piston rod retreats.
Note that in the above description of the pneumatic circuit, the head side port and rod side port of the air cylinder are referred to as the first cylinder port and the second cylinder port, respectively, but the head side port and the rod side port are respectively referred to as the second cylinder port. Even when the port and the first cylinder port are used, the effect that the piston rod of the air cylinder repeatedly moves forward and backward at a predetermined period is similarly exhibited. However, when the set value of the pilot pressure in the pressure control valve is changed, the timing at which the piston rod moves forward rather than the timing at which the piston rod retreats changes.

A fifth invention is the first invention or the second invention, wherein the guide pin is installed parallel to the moving direction of the piston rod and whose upper end is fixed to the connecting plate, and the guide pin is connected in the moving direction of the piston rod. The suction cup is characterized in that a guide portion is provided on the suction cup to guide the suction cup in parallel with the suction cup.
In float suction, the suction cup to which the tip of the piston rod is connected floats on the surface of the coolant, making it easy to swing. Therefore, as the suction cup swings, a force is applied to the tip of the piston rod in a lateral direction (approximately perpendicular to the direction of movement of the piston rod) from the suction cup in a lateral direction (approximately perpendicular to the direction of movement of the piston rod). If a force (in the vertical direction) is applied, the piston rod may be damaged. However, in the fifth invention, since the suction cup is guided by the guide pin in a direction parallel to the moving direction of the piston rod, even when the suction cup swings, the lateral force from the suction cup is applied to the tip of the piston rod. It's difficult to join.

A sixth invention is characterized in that, in the first invention or the second invention, the piston rod includes a rod-shaped body whose tip end is connected to the upper end and whose lower end is connected to the suction cup.
In the sixth invention, in addition to the effects of the first invention or the second invention, the distance from the tip of the piston rod to the suction cup changes when rod-like bodies of different lengths are used.

A seventh invention is based on the sixth invention, and the rod-like body is provided with a locking nut provided on the inner circumferential surface of the female thread that is screwed into the male thread provided on the outer circumferential surface of the tip of the piston rod. It is a cylindrical suspension rod with a female thread on the inner circumferential surface that is screwed into the male thread of the rod.The tip of the piston rod is screwed into the upper end of this suspension rod, and the stopper nut It is characterized by being installed at the upper end of the suspension rod with the tip screwed into it.
In the seventh invention, when the suspension rod is rotated with respect to the piston rod of the air cylinder, the distance from the suction cup to which the lower end of the suspension rod is connected to the connecting plate on which the air cylinder is installed changes. When the float suction is installed in a coolant tank, the float floating on the coolant surface is connected to the connecting plate, so the distance from the coolant level to the connecting plate is kept approximately constant. There is. Therefore, when the distance from the suction cup to the connecting plate changes, the height of the upper end surface of the suction cup relative to the coolant level changes.
That is, in the seventh invention, in addition to the effect of the sixth invention, when the suspension rod is rotated relative to the piston rod with the float suction installed in the coolant tank, the upper part of the suction cup relative to the coolant level is It has the effect of changing the height of the end face. Further, the locking nut has the function of preventing the piston rod from loosening with respect to the suspension rod.

An eighth invention is based on the seventh invention, comprising: a cylindrical body loosely inserted into a through hole provided on the bottom surface of the suction cup; a bolt inserted into the cylindrical body from below the suction cup; A washer is installed between the cylindrical body and the suspension rod in an inserted state, and the suspension rod has a lower end fixed to the suction cup by a bolt.
When the direction of movement of the suction cup is specified, the center axis of the piston rod and the center axis of the suspension rod are aligned, but the direction of movement of the piston rod may not completely match the direction of movement of the suction cup. be. In this case, the bolt, which is inserted through the through hole so that its central axis is parallel to the direction of movement of the suction cup, receives a force in a direction inclined to the central axis from the suspension rod that moves together with the piston rod. I will receive it.
In contrast, in the eighth invention, the cylindrical body provides a clearance between the inner circumferential surface of the through hole of the suction cup and the bolt, and the washer prevents the cylindrical body and the suspension rod from directly contacting each other. There is. In this case, since it is difficult to generate a large frictional force between the bolt and the suspension rod and the suction cup, in the eighth invention, in addition to the effect of the seventh invention, the inner peripheral surface of the through hole of the suction cup is This has the effect of alleviating the influence of the force applied to the bolt.

A ninth invention is characterized in that in the seventh invention, the piston rod and the suspension rod are connected via a floating joint.
In the ninth invention, when the moving direction of the suction cup is defined and the moving direction of the suction cup and the central axis of the suspension rod coincide, the moving direction of the piston rod is inclined with respect to the moving direction of the suction cup. If so, the direction of movement of the piston rod will be inclined with respect to the central axis of the suspension rod. However, since the floating joint has the function of preventing force from being applied to the suspension rod from the piston rod in a direction other than the direction parallel to the central axis of the suspension rod, the ninth invention In addition to this effect, the bolt that fixes the lower end of the suspension rod to the bottom surface of the suction cup has the effect that there is no possibility that the bolt that fixes the lower end of the suspension rod to the bottom surface of the suction cup will receive force from the piston rod through the suspension rod in a direction that is tilted with respect to its central axis.

A tenth invention is based on the first invention, wherein the floating material separation tank includes a separation chamber provided with a floating material supply port and a floating material discharge port, and a clarified liquid storage chamber provided with a coolant discharge port. , the separation chamber and the clarified liquid storage chamber are characterized in that they are connected at the lower part of the floating material separation tank.
In the tenth invention, the floating object is supplied from the floating object supply port to the floating object separation tank together with the coolant, and the floating object separated from the coolant in the separation chamber overflows from the floating object discharge port. At this time, the floating object contains almost no coolant. That is, in the tenth invention, in addition to the effect of the first invention, there is an effect that the coolant is difficult to be discharged from the floating object discharge port.

In addition, the floating objects have a lower specific gravity than the coolant, and the floating objects supplied into the separation chamber float in the coolant and collect near the liquid surface. separation is promoted. As a result, at the bottom of the separation chamber, a portion of the coolant (clarified liquid) that has been completely separated from the floating objects moves to the clarified liquid storage chamber, and then is discharged from the coolant outlet to the outside of the floating object separation tank.
As described above, in the tenth aspect of the invention, a space (separation chamber) in which the floating material is supplied and a space (clarified liquid storage chamber) in which the coolant discharged from the floating material separation tank exists are provided in the floating material separation tank. Therefore, there is no risk of floating objects being accidentally discharged from the coolant discharge port.

In the first invention, by collecting a certain amount of floating objects from the coolant tank, a small amount of floating objects are stably supplied to the floating object separation tank. As a result, the residence time of the floating objects in the floating object separation tank becomes longer, so a large floating object separation tank becomes unnecessary. Therefore, according to the first invention, it is possible to save space for installing the floating object separation tank.
Further, according to the first invention, since the floating objects are separated from the coolant in a stable state in the floating object separation tank, the floating objects can be efficiently recovered from the coolant.
Furthermore, the first invention can be used safely even when the coolant is water-soluble because there is no risk of accidents such as short circuits and electric shocks.

In the second invention, since a fixed amount of floating objects collected from the coolant tank is repeatedly supplied to the floating object separation tank at a predetermined period, the floating objects can be efficiently recovered from the coolant. The effect will be even more effective.

According to the third invention, simply by supplying compressed air to the pneumatic circuit, the piston rod of the air cylinder can be moved forward and backward repeatedly at a predetermined period, so that floating objects can be more easily prevented than in the first invention. The effect of the second invention, that is, can be recovered from the coolant more efficiently, is certainly exhibited.

In the fourth invention, the structure of the pneumatic circuit is simpler than in the third invention, but the same effects as the third invention can be expected. Therefore, according to the fourth invention, it is possible to reduce manufacturing costs more than in the case of the third invention.

According to the fifth invention, when the float suction is installed in a coolant tank, even if the suction cup swings, it is difficult to apply lateral force from the suction cup to the tip of the piston rod. Alternatively, in addition to the effect of the second invention, an effect that the air cylinder is less likely to break down can be expected.

According to the sixth invention, in addition to the effects of the first invention or the second invention, the distance between the air cylinder and the suction cup can be adjusted by changing the distance from the tip of the piston rod to the suction cup. play.

According to the seventh invention, in addition to the effects of the sixth invention, the height of the upper end surface of the suction cup relative to the coolant level can be easily adjusted by a simple operation of rotating the suspension rod.

According to the eighth invention, the direction of movement of the suction cup is defined, and even if the direction of movement and the direction of movement of the suspension rod do not completely match, the movement between the bolt and the suspension rod and the bottom surface of the suction cup is Since it is difficult to generate a large frictional force therebetween, in addition to the effect of the seventh invention, it is possible to prevent the suction cup from being destroyed by the force applied from the suspension rod to the bolt.

According to the ninth invention, in addition to the effect of the seventh invention, the moving direction of the suction cup is defined, and even if the moving direction and the moving direction of the suspension rod do not completely match, the suction cup It is possible to prevent damage to the through hole, and also to prevent the piston rod and the suspension rod from being damaged or deformed due to mutual force in a direction other than the movement direction or the central axis direction.

In the tenth invention, not only is the coolant difficult to discharge when the floating object is discharged from the floating object discharge port, but also the floating object is difficult to be discharged when the coolant is discharged from the coolant discharge port, so that the floating object is separated from the coolant. The proportion of floating objects is high. Therefore, by using the eighth invention, it is possible to efficiently collect floating objects from the coolant.

(a) is a schematic diagram of Example 1 of the floating object recovery device according to the embodiment of the present invention, and (b) is a plan view of the scum separation tank shown in (a) of the same figure. (a) and (b) are a plan view and a left side view of the partition plate shown in FIG. 1(a) and FIG. 1(b), respectively, and (c) is a BB line arrow in FIG. FIG. FIG. 2 is a view taken in the direction of arrow A in FIG. 1(a). (a) and (b) are a front view and a plan view, respectively, of the float suction shown in FIG. 1(a). (a) is a plan view of the suction cup shown in FIGS. 4(a) and 4(b), and (b) is a sectional view taken along the line CC in FIG. 4(b). (a) and (b) are enlarged views of the D part and E part in FIG. 5(b), respectively, and (c) and (d) are the modified examples of the same figure (a) and the same figure (b), respectively. FIG. (a) and (b) are a top view and a front view, respectively, of a modification of the suction cup shown in FIG. 5(a). (a) and (b) are diagrams respectively showing a state in which the suction cup is raised and a state in which it is lowered in FIG. 5(b). 4(a) is a block diagram showing the configuration of a pneumatic circuit that controls the operation of the air cylinder shown in FIG. 4(a), and FIG. 4(b) is a state in which compressed air is supplied to the pneumatic circuit shown in FIG. 4(a). FIG. (a) is a diagram showing a state in which the first air operated valve is switched in FIG. 9(b), and (b) is a diagram showing a state in which the second air operated valve is switched in FIG. 9(a). It is a diagram. (a) is a diagram showing a state in which the first air operated valve is switched in FIG. 10(b), and (b) is a diagram showing a state in which the second air operated valve is switched in FIG. 10(a). It is a diagram. 9(a) is a flowchart for explaining the operation of the pneumatic circuit shown in FIG. 9(a). (a) is a block diagram showing the configuration of the pneumatic circuit in Example 2 of the floating object recovery device according to the embodiment of the present invention, and (b) is a block diagram showing the configuration of the pneumatic circuit in FIG. FIG. (a) is a diagram showing how the pilot pressure acts on the pilot port of the air operated valve in Figure 13(b), and (b) is a diagram showing the state in which the air operated valve has been switched in Figure 13(a). It is a diagram. 13(a) is a flowchart for explaining the operation of the pneumatic circuit shown in FIG. 13(a).

The floating object recovery 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 floating object collection device is actually used, that is, the scum separation tank and the coolant tank are placed in a horizontal place. ” or expressions such as “upper” or “lower” are used. In addition, as an example, a case where scum floating on the surface of the coolant is collected is described, but the floating object collection device of the present invention is capable of collecting not only scum but also floating objects such as floating oil. is possible. Therefore, the following explanation also holds true even if "scum" is replaced with "floating oil" or "floating object.""Scum separation tank", "scum discharge port", "scum supply port", "scum discharge chute", "scum suction pipe", "scum supply pipe" are "floating material separation tank", "floating material discharge port",""floating object supply port,""floating object discharge chute,""floating object suction pipe," and "floating object supply pipe," respectively.
Furthermore, in the following description, in order to clarify which pilot port the pilot pressure acts on in the first air operated valve 26 and the second air operated valve 27, the first pilot port 26a, the For convenience, the pilot pressures acting on the second pilot port 27a and the third pilot port 27b are referred to as a first pilot pressure, a second pilot pressure, and a third pilot pressure, respectively.

FIG. 1(a) is a diagram schematically showing the configuration of a floating object recovery device 1 according to an embodiment of the present invention, and FIG. 1(b) is a diagram showing a structure of a scum separation tank 2 shown in FIG. 1(a). FIG. 2(a) and 2(b) are a plan view and a left side view of the partition plate 12, respectively, and FIG. 2(c) is a sectional view taken along the line BB in FIG. 1(b). . Further, FIG. 3 is a view taken in the direction of arrow A in FIG. 1(a).
In addition, illustration of the partition plate 12 is abbreviate|omitted in FIG.2(c), Only the scum separation tank 2 is shown in FIG. 3, and illustration of the L-shaped pipe 3b and the straight pipe 3f is abbreviate|omitted.

As shown in FIGS. 1(a) and 1(b), the floating object recovery device 1 of the present invention includes a scum separation tank 2 with an open top, a coolant tank 4 in which coolant 11b is stored together with scum 11a, A float suction 5 installed inside the coolant tank 4 is provided.
The scum separation tank 2 is provided with a scum discharge port 2a at the top, and a scum supply port 2b and a coolant discharge port 2c are provided at a lower position than the scum discharge port 2a. Further, a coolant discharge pipe 3 is connected to the coolant discharge port 2c, and a scum supply pipe 13 is connected to the scum supply port 2b.
Note that the scum discharge port 2a extends obliquely downward from an opening 2i (see FIG. 3) provided at the upper end of the side plate 2d and a lower edge 2k (see FIG. 1(b)) of this opening 2i. The scum discharge chute 2j (see FIG. 1(a)) is made up of a scum discharge chute 2j (see FIG. 1(a)).

One end of the scum suction pipe 6 is connected to the suction port 5a (FIG. 5) so that the scum 11a floating on the liquid surface 11c of the coolant 11b flows into the float suction 5 floating on the liquid surface 11c of the coolant 11b. (see a)).
In addition, a filter 7 and an air-driven diaphragm pump 8 are installed in the scum suction pipe 6, which is made of a flexible hose that can be easily deformed in addition to a metal or plastic hose, and the other end of the scum suction pipe 6 is It is connected to the scum supply port 2b of the scum separation tank 2.

The inside of the scum separation tank 2 has a liquid passage port 12a, and a scum supply port 2b is connected to the bottom plate 2g by a partition plate 12 fixed to the inner surface of the side plate 2d using a mounting plate 10 that is L-shaped in plan view. It is divided into two spaces consisting of a separation chamber 2e provided and a clear liquid storage chamber 2f provided with a coolant discharge port 2c on a side plate 2d.
Although not an essential component of the floating object recovery device 1, a scum tank 9 for storing the scum 11a discharged from the scum separation tank 2 is installed below the scum discharge port 2a.

The scum supply pipe 13 has a connecting pipe 13a fitted into the scum supply port 2b of the scum separation tank 2, a lower end connected to the connecting pipe 13a, and one end of an L-shaped pipe 13c connected to the upper end of the scum separating tank. 2, and a T-shaped tube 13d connected to the other end of the L-shaped tube 13c.
The coolant discharge pipe 3 includes an L-shaped pipe 3a with one end inserted into the coolant discharge port 2c of the scum separation tank 2, and a liquid level adjustment socket 3c attached to the other end of the L-shaped pipe 3a. It is composed of an L-shaped pipe 3b whose one end is connected to the L-shaped pipe 3a, and a straight pipe 3f whose upper end is connected to the other end of the L-shaped pipe 3b and is installed parallel to the depth direction of the scum separation tank 2. ing.

As shown in FIGS. 2(a) and 2(b), the partition plate 12 has two flat plate portions 14a and 14b arranged substantially parallel to each other by bending a flat plate material having a rectangular shape in plan view twice. and a connecting portion 14c that connects them both have a rectangular shape in plan view. In addition, screw insertion holes 12b are provided at the four corners of the partition plate 12, respectively, to be used when the partition plate 12 is fixed to the side plate 2d of the scum separation tank 2 using the mounting plate 10. The above-mentioned liquid passage port 12a is provided. That is, the separation chamber 2e and the clarified liquid storage chamber 2f are connected through a liquid passage port 12a provided in a flat plate portion 14b arranged at the lower part of the scum separation tank 2.
In addition, instead of providing the liquid passage port 12a in the flat plate part 14b of the partition plate 12, a gap is provided between the bottom plate 2g of the scum separation tank 2 and the flat plate part 14b, and this gap allows the separation chamber 2e and the clarified liquid storage chamber 2f to be separated. It can also be a connected structure. In addition, instead of attaching the partition plate 12 to the scum separation tank 2, a partition wall is provided inside the scum separation tank 2, and by partitioning with this partition wall, the scum separation tank 2 has a separation chamber 2e and a clarified liquid. A storage chamber 2f may also be formed.

Further, in FIG. 1(a), the separation chamber 2e and the clarified liquid storage chamber 2f are connected at the bottom of the scum separation tank 2 by the liquid passage port 12a of the partition plate 12 provided near the bottom plate 2g of the scum separation tank 2. However, since the liquid passage port 12a only needs to be provided at the bottom of the scum separation tank 2, the location where the liquid passage port 12a is provided is not limited to the vicinity of the bottom plate 2g of the scum separation tank 2. , can be changed as appropriate.
However, if the liquid passage port 12a is provided near the bottom plate 2g of the scum separation tank 2, the separation chamber 2e and the clarified liquid storage chamber 2f will be connected at the bottom of the scum separation tank 2. The effect can be expected that only the coolant 11b, which is completely separated and stored at the bottom of the scum separation tank 2, passes through the liquid passage port 12a and moves from the separation chamber 2e to the clear liquid storage chamber 2f.

As shown in FIG. 2(c), the liquid level adjustment socket 3c is made of a cylindrical body with a female thread formed on the inner peripheral surface, and is arranged inside the scum separation tank 2 so that the cylindrical axis is parallel to the vertical direction. It is installed in One end of an L-shaped tube 3a, which has a male threaded portion on its outer circumferential surface that is screwed into the female threaded portion, is screwed into the lower end 3d of the liquid level adjustment socket 3c. In addition, since the L-shaped tube 3a is fixed to the side plate 2d of the scum separation tank 2 with the other end inserted into the coolant discharge port 2c, the liquid level adjustment socket 3c is connected to the L-shaped tube 3a. When the liquid level adjustment socket 3c is rotated, the liquid level adjustment socket 3c is raised or lowered relative to the scum separation tank 2.

The coolant 11b that has exceeded the upper end 3e of the liquid level adjustment socket 3c in the clarified liquid storage chamber 2f flows into the liquid level adjustment socket 3c as shown by the arrow in FIG. 2(c), and then flows into the L-shaped pipe 3a. , the scum separation tank 2 through the L-shaped pipe 3b and the straight pipe 3f. Then, the coolant 11b in the separation chamber 2e moves to the clear liquid storage chamber 2f through the liquid passage port 12a of the partition plate 12 until the liquid level 11c becomes the same as that of the coolant 11b shown in FIG. 2(c). That is, when the liquid level adjustment socket 3c is rotated with respect to the L-shaped tube 3a, the height of the liquid level 11c of the coolant 11b changes.
Note that the adjustment width of the liquid level of the coolant 11b in the scum separation tank 2 is preferably about 3 to 4 mm, for example, when the scum 11a forms a thin film layer of lubricating oil or the like with good fluidity. If the scum 11a forms a thick layer of particles or bubbles with poor fluidity, the thickness should be about 5 to 8 mm. That is, it is desirable that the above-mentioned adjustment width of the liquid level of the coolant 11b be set according to the shape and fluidity of the scum 11a.

In the scum separation tank 2, when the height of the liquid level 11c of the coolant 11b exceeds the level 2h of the lower edge 2k of the scum discharge port 2a (see FIG. 1(a)), the coolant 11b is transferred to the scum discharge port together with the scum 11a. It will be discharged from 2a. However, in the floating object recovery device 1, by rotating the liquid level adjustment socket 3c with respect to the L-shaped pipe 3a, the height of the liquid level 11c of the coolant 11b is adjusted and set lower than the above-mentioned level 2h. This makes it possible to minimize the amount of coolant 11b discharged from the scum discharge port 2a together with the scum 11a.
In this way, in the floating object recovery device 1, the height of the liquid level 11c of the coolant 11b can be adjusted by a simple operation of rotating the liquid level adjustment socket 3c with respect to the L-shaped pipe 3a, so that the scum discharge port can be adjusted. It is possible to discharge highly pure scum 11a from the scum separation tank 2 by reducing the amount of coolant 11b discharged from the scum 2a together with the scum 11a.

In the floating object recovery device 1 having the above structure, a part of the scum 11a floating on the liquid surface 11c of the coolant 11b stored in the coolant tank 4 is collected by the float suction 5, and is passed through the scum suction pipe 6. 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 8 installed therein. Note that when the scum 11a is collected by the float suction 5, the coolant 11b is also collected, but as will be described later, the float suction 5 is designed to suppress the amount of the coolant 11b collected together with the scum 11a. It has a structure.

The scum 11a and coolant 11b supplied from the coolant tank 4 to the connecting pipe 13a of the scum supply pipe 13 installed at the scum supply port 2b of the scum separation tank 2 rise inside the straight pipe 13b, and then flow into the L-shaped pipe 13c. and flows into the T-tube 13d. Then, the air contained in the scum 11a is discharged to the atmosphere from the upper end of the T-shaped tube 13d, and the remaining scum 11a and coolant 11b are discharged from the lower end of the T-shaped tube 13d.
At this time, since the T-tube 13d is installed so that its lower end is above the level 2h, the scum 11a and coolant 11b discharged from the T-tube 13d are already stored in the scum separation tank 2. The coolant 11b is supplied quietly from above without causing the liquid surface 11c (see FIG. 2(c)) to ripple significantly.

When the scum 11a is discharged from the scum discharge port 2a in the form of foam, there is little coolant 11b contained in the scum 11a, but if the liquid level 11c of the coolant 11b is greatly undulated, only the scum 11a in the form of foam is present. Instead, a large amount of coolant 11b may be discharged from the scum discharge port 2a together with the scum 11a. However, as described above, the floating object recovery device 1 gently collects the scum 11a and the coolant 11b from above so that the liquid level 11c of the coolant 11b, which is already stored in the scum separation tank 2, does not ripple. The structure is supplied. That is, in the floating object recovery device 1, when the scum 11a is supplied to the scum separation tank 2, the liquid surface 11c of the coolant 11b does not wave significantly, so that the coolant is discharged from the scum discharge port 2a together with the scum 11a. The amount of 11b is small.

Since the scum 11a supplied to the separation chamber 2e of the scum separation tank 2 together with the coolant 11b has a smaller specific gravity than the coolant 11b, it floats in the coolant 11b. At this time, since the connecting portion 14c of the partition plate 12 is inclined, even if the floating scum 11a comes into contact with the partition plate 12, its movement is hardly hindered.
Further, as shown in FIG. 3, since the width of the separation chamber 2e is narrower at the upper part than at the lower part, the scum 11a that has reached the liquid level 11c of the coolant 11b tends to form a thick layer of bubbles there.

When the foam layer formed by the scum 11a is thick, it becomes easier to set the height of the liquid level 11c of the coolant 11b lower than the level 2h of the lower edge 2k of the scum discharge port 2a. Therefore, according to the floating object recovery device 1 that can easily adjust the height of the liquid level 11c of the coolant 11b using the liquid level adjustment socket 3c, it is possible to discharge the highly pure scum 11a from the scum separation tank 2. It is possible.
Furthermore, the scum separation tank 2 has a structure in which the width of the lower part of the separation chamber 2e is wide and the scum 11a and the coolant 11b tend to stay there for a long time, so that the scum 11a and the coolant 11b are easily separated.

In the clarified liquid storage chamber 2f of the scum separation tank 2, a part of the coolant 11b (hereinafter referred to as clarified liquid) that has been completely separated from the scum 11a flows through the liquid passage port 12a (see FIG. 1) provided near the bottom plate 2g. a)) and move toward the clarified liquid storage chamber 2f.
The coolant 11b (clarified liquid) that has moved to the clarified liquid storage chamber 2f is discharged from the scum separation tank 2 through the coolant discharge pipe 3 through the coolant discharge port 2c (see FIG. 2(c)). , and is returned to the coolant tank 4 as shown by the dashed line arrow in FIG. 1(a).

In this way, in the floating object recovery device 1, the inside of the scum separation tank 2 is separated by the partition plate 12 into the separation chamber 2e (in order to separate the scum 11a supplied together with the coolant 11b from the scum supply port 2b from the coolant 11b). A clear liquid storage chamber 2f (a space in which the coolant 11b (clarified liquid) completely separated from the scum 11a is stored). Therefore, there is no possibility that the scum 11a supplied to the scum separation tank 2 will be discharged as it is from the coolant discharge port 2c.

That is, in the floating object recovery device 1, not only is it difficult to discharge the coolant 11b when the scum 11a is discharged from the scum discharge port 2a, but also the scum 11a is difficult to discharge together with the coolant 11b when the coolant 11b is discharged from the coolant discharge port 2c. There is no risk of it being ejected. Therefore, in the floating object recovery device 1, the high purity scum 11a separated from the coolant 11b is discharged from the scum discharge port 2a. Therefore, by using the floating object recovery device 1, it is possible to efficiently recover the scum 11a from the coolant 11b.
In addition, in the floating material collection device 1, if the scum separation tank 2 is used for a long period of time, solids with a large specific gravity may settle at the bottom, so it is necessary to periodically clean the scum separation tank 2. . In this respect, the partition plate 12 is removably fixed to the side plate 2d of the scum separation tank 2 using screws or bolts, and can be easily removed during cleaning work. Therefore, in the floating object recovery device 1, the cleaning work of the scum separation tank 2 can be easily performed.

4(a) and 4(b) are a front view and a plan view of the float suction 5, respectively. Further, FIG. 5(a) is a plan view of the suction cup 15 shown in FIGS. 4(a) and 4(b), and FIG. 5(b) is a cross section taken along the line CC in FIG. 4(b). It is a diagram. Furthermore, FIGS. 6(a) and 6(b) are enlarged views of the D part and E part in FIG. 5(b), respectively, and FIGS. 6(c) and 6(d) are respectively the enlarged views of the D part and E part in FIG. 6(a). and FIG. 6B is a diagram showing a modification of FIG. 6(b).
In addition, in FIG. 5(b), only the suction cup 15 is shown in cross section, and the external appearance of the other components is shown. Moreover, in FIG. 6(c), unlike FIG. 6(a), the suspension rod 20 and the locking nut 21 are also shown externally.

As shown in FIGS. 4(a) and 4(b), FIGS. 5(a) and 5(b), and FIGS. 6(a) and 6(b), the float suction 5 is located on the side near the bottom surface 15a. A suction cup 15 with a suction port 5a provided on the suction cup 15b, a connecting plate 16 having three arm portions 16a, and a float connected to the tips of the three arm portions 16a on the lower surface 16b side using bolts 17a, respectively. 18, an air cylinder 19 installed on the upper surface 16c side of the connecting plate 16, and an air cylinder 19 having a male threaded portion at the tip and protruding from the lower surface 16b through a through hole (not shown) provided in the connecting plate 16. a suspension rod 20 made of a cylindrical body whose inner peripheral surface is provided with a female threaded part that is screwed into the male threaded part of the piston rod 19a; and a suspension rod 20 arranged at the upper end 20a of this suspension rod 20. A locking nut 21 into which the piston rod 19a is screwed in the suspended state, a bolt 17b into which the lower end 20b of the suspension rod 20 is screwed, and a cylindrical through hole provided in the bottom surface 15a of the suction cup 15. 15c (see FIG. 6(b)), a pair of washers 22b, 22b, which are placed at both ends of this collar 22a and communicated with the bolt 17b together with the collar 22a, and an upper end 23a. is fixed to the arm portion 16a, and the lower end 23b is slidably and loosely inserted into the guide hole 15d (see FIG. 5(a)) provided in the suction cup 15 so as to be parallel to the moving direction of the piston rod 19a. Three guide pins 23 are provided.
Note that when the guide pin 23 inserted through the guide hole 15d of the suction cup 15 moves in the vertical direction, there is a gap between the inner circumferential surface of the guide hole 15d and the outer circumferential surface of the guide pin 23 so as not to obstruct the movement. , it is necessary to provide clearance. However, this clearance is set to a size that prevents a large amount of coolant 11b from flowing into the suction cup 15.

In the float suction 5, the suction cup 15 to which the tip of the piston rod 19a is connected floats on the liquid surface 11c of the coolant 11b and is in a state in which it is easy to swing. Therefore, if a lateral force (a direction substantially perpendicular to the moving direction of the piston rod 19a) is applied to the tip of the piston rod 19a from the suction cup 15 as the suction cup 15 swings, the piston rod 19a may be damaged.
However, in the float suction 5 having the above structure, the suction cup 15 is guided by the guide pin 23 in a direction parallel to the moving direction of the piston rod 19a, so that even if the suction cup 15 swings, a lateral force is unlikely to be applied to the tip of the piston rod 19a from the suction cup 15. Therefore, in the floating object recovery device 1, the air cylinder 19 is unlikely to break down.

In the float suction 5, the central axis of the piston rod 19a and the central axis of the suspension rod 20 coincide, but the moving direction of the piston rod 19a does not completely match the moving direction of the suction cup 15 guided by the guide pin 23. It may not. At this time, the bolt 17b inserted into the through hole 15c so that the central axis is parallel to the moving direction of the suction cup 15 is tilted with respect to the central axis from the suspension rod 20 that moves together with the piston rod 19a. The force will be applied in the opposite direction. On the other hand, in the float suction 5 having the above structure, a clearance is provided by the collar 22a between the inner peripheral surface of the through hole 15c of the suction cup 15 and the bolt 17b, and the lower end 20b of the suspension rod 20 (see FIG. 6(b) ) and the bottom surface 15a of the suction cup 15, so that the collar 22a and the suspension rod 20 do not come into direct contact with each other.
In this case, since a large frictional force is unlikely to be generated between the bolt 17b, the suspension rod 20, and the bottom surface 15a of the suction cup 15, the influence of the force applied to the bolt 17b on the inner peripheral surface of the through hole 15c is alleviated. Ru. Therefore, even if the moving direction of the piston rod 19a does not completely match the moving direction of the suction cup 15, the through hole 15c of the suction cup 15 will be destroyed by the force applied from the suspension rod 20 to the bolt 17b. There isn't.

Furthermore, when the suspension rod 20 is rotated relative to the piston rod 19a of the air cylinder 19, the distance from the suction cup 15 to which the lower end 20b of the suspension rod 20 is connected to the connection plate 16 on which the air cylinder 19 is installed changes. . When the float suction 5 is installed in the coolant tank 4, the float 18 floating on the liquid level 11c of the coolant 11b is connected to the connecting plate 16, so that from the liquid level 11c of the coolant 11b to the connecting plate 16. The distance is kept approximately constant. Therefore, when the distance from the suction cup 15 to the connecting plate 16 changes, the height of the upper end surface 15e (see FIG. 5(b)) of the suction cup 15 relative to the liquid level 11c of the coolant 11b changes.
That is, in the float suction 5, the height of the upper end surface 15e of the suction cup 15 relative to the liquid level 11c of the coolant 11b can be adjusted by rotating the suspension rod 20 with respect to the piston rod 19a. Note that the locking nut 21 has the function of preventing the piston rod 19a from loosening with respect to the suspension rod 20.

Further, when suspension rods 20 of different lengths are used, the distance from the tip of the piston rod 19a to the suction cup 15 changes, and in this case, the distance between the air cylinder 19 and the suction cup 15 changes. That is, in the float suction 5 having the above structure, the distance between the air cylinder 19 and the suction cup 15 can be easily adjusted depending on the size of the coolant tank 4.
Note that a structure in which the piston rod 19a and the suction cup 15 are connected by a rod-shaped body instead of the suspension rod 20 can also be used, but even in this case, by using rod-shaped bodies of different lengths, the air cylinder 19 and the suction cup can be connected. The above-mentioned effect of being able to easily adjust the spacing of 15 is also achieved.

The portions D and E in FIG. 5(b) are not limited to the structures shown in FIGS. 6(a) and 6(b). For example, the connection portion between the piston rod 19a and the suspension rod 20 and the connection portion between the suction cup 15 and the suspension rod 20 may have a structure as shown in FIGS. 6(c) and 6(d).
That is, instead of the collar 22a being loosely inserted into the through hole 15c of the suction cup 15 and the washer 22b being installed on the upper end of the collar 22a, the piston rod 19a and the suspension rod 20 are connected via the floating joint 22c. It's okay. Note that the floating joint 22c has a function of preventing force from being applied to the suspension rod 20 from the piston rod 19a in a direction other than the direction parallel to the central axis of the suspension rod 20.

In the float suction 5 having the above structure, since the central axis of the bolt 17b, the central axis of the suspension rod 20, and the moving direction of the suction cup 15 are aligned, the moving direction of the piston rod 19a is relative to the moving direction of the suction cup 15. If they do not match perfectly, the moving direction of the piston rod 19a will be inclined with respect to the central axis of the suspension rod 20. However, even in such a case, due to the action of the floating joint 22c, force is applied from the piston rod 19a only in a direction parallel to the central axis of the suspension rod 20, so that the bolt 17b receives a force in a direction tilted with respect to the central axis. There is no risk of receiving it from the piston rod 19a via the suspension rod 20. Therefore, the through hole 15c of the suction cup 15 will not be damaged by the force applied to the bolt 17b.
Furthermore, if the moving direction of the piston rod 19a is inclined with respect to the central axis of the suspension rod 20, the piston rod 19a may be damaged or deformed by receiving a force parallel to the moving direction, or the suspension rod 20 may be tilted with respect to the central axis of the suspension rod 20. There is no risk of damage or deformation due to receiving force in other directions.

7A and 7B are a plan view and a front view, respectively, of a suction cup 41 according to a modification of the suction cup 15. FIG. Further, FIGS. 8(a) and 8(b) are diagrams showing a state in which the suction cup 15 is raised and a state in which it is lowered in FIG. 5(b), respectively.
In addition, in FIG. 7A, a portion of the upper end surface 15e of the suction cup 41 where the slit 41a is not provided is hatched to distinguish it from a portion where the slit 41a is provided.
As shown in FIGS. 7(a) and 7(b), the suction cup 41 has three slits 41a having a desired depth from the upper end surface 15e and a desired width in the circumferential direction in the suction cup 15. It has a structure in which they are provided at approximately equal intervals in the circumferential direction.
When the float suction 5 equipped with the suction cup 41 having such a structure is installed in the coolant tank 4 instead of the suction cup 15, the lowest part 41b of the slit 41a is slightly higher than the liquid level 11c of the coolant 11b. However, if it is low, the scum 11a flows into the suction cup 41 through the slit 41a.

For example, when the distance between the float 18 and the suction cup 50 is short, if the suction cup 41 is arranged so that the overlap between the arm 16a and the slit 41a is minimized when viewed from above, the float 18 can control the flow of the scum 11a. Since the scum 11a does not get in the way, it smoothly flows into the suction cup 41. On the other hand, if the distance between the float 18 and the suction cup 41 is long and there is no risk that the float 18 will disturb the flow of the scum 11a no matter what positional relationship the float 18 and the slit 41a have, It is desirable to use a suction cup 15 having a structure in which the scum 11a flows in from the entire circumference.

In the floating object recovery device 1 having such a structure, when the float suction 5 is floated on the liquid level 11c of the coolant 11b stored in the coolant tank 4, the suction cup 15 moves downward as the piston rod 19a moves forward. When the upper end surface 15e of the suction cup 15 becomes lower than the scum 11a floating on the liquid level 11c of the coolant 11b, the scum 11a flows into the interior of the suction cup 15 over the upper end surface 15e. (See Figure 8(a)).
On the other hand, when the suction cup 15 moves upward with the retreat of the piston rod 19a, the upper end surface 15e of the suction cup 15 becomes higher than the scum 11a floating on the liquid level 11c of the coolant 11b. does not flow into the suction cup 15 beyond the upper end surface 15e (see FIG. 8(b)).

When the air cylinder 19 is operated with the float suction 5 floating on the liquid level 11c of the coolant 11b, the suction cup 15 moves vertically as the piston rod 19a moves forward or backward.
Therefore, if the stroke of the piston rod 19a is adjusted in advance so that the states shown in FIGS. 8(a) and 8(b) are obtained when the piston rod 19a moves forward the most and when it retreats the most, the piston By operating the air cylinder 19 so that the rod 19a moves forward and backward repeatedly, the phenomenon in which the suction cup 15 descends to a certain depth and then rises to a certain height is repeated. Each time, a certain amount of scum 11a flows into the suction cup 15, thereby stabilizing the amount of scum 11a collected from the coolant tank 4 and supplied to the scum separation tank 2.
In this way, in the floating object collection device 1, a certain amount of scum 11a is collected from the coolant tank 4 and supplied to the scum separation tank 2, so that the scum 11a is stably separated from the coolant 11b in the scum separation tank 2. do.

The sinking depth of the suction cup 15 (the depth at which the suction cup 15 sinks from the state shown in FIG. 8(a) to the state shown in FIG. 8(b)) is, for example, if the coolant 11b is a lubricating oil with good fluidity. If a thin layer is formed by the scum 11a, the thickness should be about 3 to 4 mm, and if the fluidity of the coolant 11b is poor and a thick granular or foamy layer is formed by the scum 11a, the thickness should be about 5 to 8 mm. etc., may be set depending on the shape of the scum 11a and the fluidity of the coolant 11b.
Further, it is desirable to raise the suction cup 15 when the scum 11a accumulates at about the 8th minute, and to keep the air-driven diaphragm pump 8 in constant operation even when the suction cup 15 is rising or falling. . In this way, in addition to the scum 11a and the coolant 11b, air is also sucked, and the interior of the suction cup 15 becomes completely empty. Therefore, by repeating this at the same cycle, the amount of collected scum 11a can be kept constant.

When a certain amount of scum 11a is collected from the coolant tank 4, a small amount of scum 11a is stably supplied to the scum separation tank 2. This lengthens the residence time of the scum 11a in the scum separation tank 2, eliminating the need for a large scum separation tank 2. Therefore, according to this method, it is possible to save space required for installing the scum separation tank 2.
Furthermore, since the floating matter recovery device 1 is structured to move the suction cup 15 up and down by the air cylinder 19, unlike the case where an electric cylinder is used, there is no need to install a power supply facility or an electric cord near the coolant tank 4. Therefore, even if the coolant 11b is water-soluble, there is no risk of accidents such as short circuits or electric shock. Therefore, the floating matter recovery device 1 can be safely used in the work of recovering scum 11a from the water-soluble coolant 11b.

FIG. 9(a) is a block diagram showing the configuration of a pneumatic governor (double) (hereinafter referred to as the pneumatic circuit 24a) that controls the operation of the air cylinder 19 shown in FIG. 4(a). b) is a diagram showing a state in which compressed air is supplied to the pneumatic circuit 24a of FIG. 9(a). Further, FIG. 10(a) is a diagram showing a state in which the first air operated valve 26 is switched in FIG. 9(b), and FIG. 10(b) is a diagram showing a state in which the first air operated valve 26 is switched in FIG. 27 is a diagram showing a state in which the switch 27 has been switched. Further, FIG. 11(a) is a diagram showing a state in which the first air operated valve 26 is switched in FIG. 10(b), and FIG. 11(b) is a diagram showing a state in which the first air operated valve 26 is switched in FIG. 27 is a diagram showing a state in which the switch 27 has been switched. FIG. 12 is a flowchart for explaining the operation of the pneumatic circuit 24a.
In addition, in FIGS. 9(b) to 11(b), an air tube through which compressed air supplied from the air pressure supply source to the air cylinder 19 flows and an air tube through which compressed air discharged from the air cylinder 19 flows. are shown by thick solid lines and thin solid lines, respectively, and the compressed air supplied from the pneumatic supply source to the first air chamber 28 and the second air chamber 29 and the first air operated valve 26 and the second air operated valve 27 is shown by a thick solid line and a thin solid line, respectively. The flowing air tube is shown by a thick broken line, and the compressed air discharged from the first air chamber 28 and the second air chamber 29 and the first air operated valve 26 and the second air operated valve 27 is flowing. The air tube is indicated by a thin dashed line.

As shown in FIG. 9(a), the pneumatic circuit 24a that controls the operation of the air cylinder 19 includes a manual valve 25 to which compressed air is supplied from an air pressure supply source (not shown) via an air tube 33h, and a manual valve 25 that controls the operation of the air cylinder 19. The first air operated valve 26 and the second air operated valve 27, the first air chamber 28 and the second air chamber 29, the orifices 30a and 30b, the first pressure control valve 31a and the second pressure control valve The valve 31b, the first speed control valve 31c and the second speed control valve 31d, the first quick exhaust valve 32a and the second quick exhaust valve 32b, the air tubes 33a to 33g, and the first It includes a branch tube 34a and a second branch tube 34b.

In addition to five ports, the first air operated valve 26 has a first pilot port 26a and a spring 26b, and in the initial state shown in FIGS. 9(a) and 9(b), When the compressed air discharged from the air cylinder 19 is supplied to the first pilot port 26a as shown in FIG. 10(a), the state changes to the first state shown in FIGS. When the compressed air supplied from the pneumatic supply source from the air cylinder 19 to the first pilot port 26a acts as the first pilot pressure as shown in FIG. 11(a) and FIG. 11(b), It has a structure that switches between two states.
Note that when the compressed air discharged from the air cylinder 19 is no longer supplied to the first pilot port 26a in the first state, the first air operated valve 26 is switched to the initial state by the biasing force of the spring 26b.

The second air operated valve 27 has five ports as well as a second pilot port 27a and a third pilot port 27b. When the second pilot pressure acts on the second pilot port 27a in the third state shown in FIGS. 9(a) to 10(a) and FIG. 11(b), The structure switches to the third state when the third pilot pressure acts on the third pilot port 27b in the fourth state as shown in FIG. 11(a). It becomes.

The manual valve 25 and the first air operated valve 26 are connected by an air tube 33a, and the second air operated valve 27 is connected to the end of the first branch tube 34a branched from the air tube 33a. . Further, the first air operated valve 26 and the first air chamber 28 are connected by an air tube 33b, and the air tube 33b has an orifice 30a and a first A quick exhaust valve 32a is interposed. Furthermore, the first air operated valve 26 and the second air chamber 29 are connected by an air tube 33c, and the air tube 33c has an orifice 30b and a second A quick exhaust valve 32b is interposed.

The head side port 19b and rod side port 19c of the air cylinder 19 are connected to the second air operated valve 27 through air tubes 33d and 33e, respectively. The air tubes 33d and 33e are provided with a first speed control valve 31c and a second speed control valve 31d for the purpose of adjusting the speed of compressed air supplied to the head side port 19b and rod side port 19c of the air cylinder 19. is interposed.
That is, the pneumatic circuit 24a has a structure in which the forward speed and backward speed of the piston rod 19a can be adjusted individually by operating the first speed control valve 31c and the second speed control valve 31d, respectively.

The first air chamber 28 and the second air chamber 29 are connected to the second pilot port 27a and the third pilot port 27b of the second air operated valve 27 by air tubes 33f and 33g, respectively. A first pressure control valve 31a and a second pressure control valve 31b are interposed in 33f and 33g, respectively.
Further, the end of the second branch tube 34b branched from the air tube 33e is connected to the first pilot port 26a of the first air operated valve 26.

In FIG. 9(a), when the manual valve 25 is opened to communicate the air tube 33h and the air tube 33a, the first branch tube 34a and the air tube 33d communicate with each other at the second air operated valve 27, so the air pressure supply source A part of the compressed air supplied to the air tube 33h from (not shown) passes through the air tube 33a, the first branch tube 34a, and the air tube 33d to the air cylinder as shown by the thick solid line in FIG. 9(b). 19 is supplied to the head side port 19b.
As a result, the piston rod 19a of the air cylinder 19 moves forward (step S1 in FIG. 12). At this time, the compressed air discharged from the rod side port 19c is supplied to the second air operated valve 27 via the air tube 33e, as shown by a thin solid line, and then discharged into the atmosphere.

In FIG. 9(b), when the first air operated valve 26 is switched from the initial state to the first state shown in FIG. 10(a), the air tube 33a and the air tube 33b in the first air operated valve 26 are In order to communicate with each other, compressed air is supplied from an air pressure source (not shown) to the air tube 33h, passes through the air tube 33a and the air tube 33b as shown by the thick broken line, and after the flow rate is controlled by the orifice 30a, the air is supplied to the air tube 33h. The air flows into the first air chamber 28 through the first quick exhaust valve 32a.

When the internal pressure of the first air chamber 28 gradually increases and reaches a value indicating the preset pressure (pilot pressure) for the first pressure control valve 31a, this compressed air is transferred to the first air chamber 28. and is supplied to the second pilot port 27a of the second air operated valve 27. Then, as this compressed air acts as a second pilot pressure, the second air operated valve 27 changes from the third state shown in FIG. 10(a) to the fourth state shown in FIG. 10(b). (Step S2 in FIG. 12).
Note that when compressed air is no longer supplied to the air tube 33b from the air pressure supply source via the air tubes 33h and 33a, the compressed air inside the first air chamber 28 is instantly released to the atmosphere by the first quick exhaust valve 32a. By being discharged into the air, the interior of the first air chamber 28 becomes pressureless.

In the pneumatic circuit 24a, when the knob of the first pressure control valve 31a is operated to set the pilot pressure to a high value, the operation of the second air operated valve 27, which switches from the third state to the fourth state, is slow. Therefore, the timing at which the piston rod 19a retreats is delayed, and when the pilot pressure is set to a low value, the operation of the second air operated valve 27 becomes faster, so the timing at which the piston rod 19a retreats becomes faster.
That is, in the pneumatic circuit 24a, the timing at which the piston rod 19a retreats can be adjusted by operating the first pressure control valve 31a. Note that the timing of the piston rod 19a can also be adjusted by changing the diameter of the orifice 30a or the volume of the first air chamber 28.

As shown in FIG. 10(b), when the second air operated valve 27 is in the fourth state, the first branch tube 34a and the air tube 33e communicate with each other in the second air operated valve 27, so that the air pressure supply source Compressed air supplied to the air tube 33h from (not shown) is supplied to the rod side port 19c of the air cylinder 19 through the first branch tube 34a and the air tube 33e, as shown by a thick solid line.
As a result, the piston rod 19a of the air cylinder 19 retreats (step S3 in FIG. 12). The compressed air discharged from the head side port 19b is supplied to the second air operated valve 27 via the air tube 33d, as shown by a thin solid line, and then discharged into the atmosphere. Further, the remainder of the compressed air supplied from the air pressure supply source to the air tube 33e is sent to the first pilot port 26a of the first air operated valve 26 via the second branch tube 34b, as shown by the thick broken line. Supplied.

In FIG. 10(b), the compressed air supplied to the first pilot port 26a of the first air operated valve 26 acts on the first air operated valve 26 as a first pilot pressure. As a result, the first air operated valve 26 switches from the first state shown in FIG. 10(b) to the second state shown in FIG. 11(a) (step S4 in FIG. 12).
As shown in FIG. 11(a), when the first air operated valve 26 enters the second state, the air tube 33a and the air tube 33c communicate with each other in the first air operated valve 26. The compressed air supplied to the air tube 33h from the air tube 33h passes through the air tubes 33a and 33c as shown by the thick broken line, and after the flow rate is controlled by the orifice 30b, it passes through the second quick exhaust valve 32b and is discharged from the second rapid exhaust valve 32b. The air flows into the air chamber 29 . At this time, the compressed air within the air tube 33b is released into the atmosphere via the first air operated valve 26.
When the internal pressure of the second air chamber 29 gradually increases and reaches a value indicating the preset pressure (pilot pressure) for the second pressure control valve 31b, compressed air is discharged from the second air chamber 29. It flows out and is supplied to the third pilot port 27b of the second air operated valve 27. Then, as this compressed air acts as the third pilot pressure, the second air operated valve 27 changes from the fourth state shown in FIG. 11(a) to the third state shown in FIG. 11(b). (Step S5 in FIG. 12).

When compressed air is no longer supplied to the air tube 33c from the air pressure supply source via the air tubes 33h and 33a, the compressed air inside the second air chamber 29 is instantly released into the atmosphere by the second quick exhaust valve 32b. By being discharged, the inside of the second air chamber 29 becomes pressureless.
Note that when the knob of the second pressure control valve 31b is operated to set the pilot pressure to a high value, the operation of the second air operated valve 27, which switches from the fourth state to the third state, becomes slower. If the timing at which the piston rod 19a moves forward is delayed and the pilot pressure is set to a low value, the operation of the second air operated valve 27 becomes faster, so the timing at which the piston rod 19a moves forward becomes faster.
That is, in the pneumatic circuit 24a, the timing at which the piston rod 19a moves forward can be adjusted by operating the second pressure control valve 31b. Note that the timing of the piston rod 19a can also be adjusted by changing the diameter of the orifice 30b and the volume of the second air chamber 29.

As shown in FIG. 11B, when the second air operated valve 27 is in the third state, the first branch tube 34a and the air tube 33d are connected in the second air operated valve 27, so that compressed air supplied to the air tube 33h from an air pressure supply source (not shown) is supplied to the head side port 19b of the air cylinder 19 through the first branch tube 34a and the air tube 33d, as shown by the thick solid line.
As a result, the piston rod 19a of the air cylinder 19 advances again (step S1 in FIG. 12). At this time, the compressed air discharged from the rod side port 19c is supplied to the second air operated valve 27 via the air tube 33e as shown by the thin solid line, and then released into the atmosphere. The compressed air in the second branch tube 34b is released into the atmosphere via the air tube 33e and the second air operated valve 27.
When the second air operated valve 27 is in the third state, the compressed air supplied from the air pressure source to the air tube 33a is no longer supplied to the air tube 33e and the second branch tube 34b, and the first pilot pressure is no longer applied to the first pilot port 26a. As a result, the first air operated valve 26 is switched from the second state to the first state by the biasing force of the spring 26b, and the air pressure circuit 24a returns to the state shown in Fig. 10(a). As a result, the compressed air in the air tube 33c is released into the atmosphere via the first air operated valve 26, and the compressed air in the second air chamber 29 is instantly released into the atmosphere by the second quick exhaust valve 32b, so that the inside of the second air chamber 29 becomes pressureless.

In this way, when compressed air is supplied to the pneumatic circuit 24a, the pneumatic circuit 24a acts on the air cylinder 19 to cause the piston rod 19a to move forward and backward repeatedly at a predetermined period.
Note that, as already explained using FIGS. 4 to 6, the suction cup 15 is connected to the tip of the piston rod 19a via the suspension rod 20. Therefore, after adjusting the stroke of the piston rod 19a in advance so that the states shown in FIGS. 8(a) and 8(b) are obtained when the piston rod 19a moves forward the most and when it retreats the most, the coolant tank 4 When the float suction 5 is floated on the liquid level 11c of the coolant 11b stored in the coolant 11b and the air cylinder 19 is operated in this state, the suction cup 15 moves vertically as the piston rod 19a moves forward and backward, and the coolant A phenomenon in which a certain amount of scum 11a floating on the liquid surface 11c of scum 11b flows into the interior of the suction cup 15 is repeated at a certain period.
In this way, in the floating object collection device 1 equipped with the pneumatic circuit 24a, by simply supplying compressed air to the pneumatic circuit 24a, a certain amount of scum 11a collected from the coolant tank 4 is transferred to the scum separation tank 2 at a predetermined period. Since the scum 11a is repeatedly supplied to the coolant 11b, the effect of efficiently recovering the scum 11a from the coolant 11b is reliably exhibited.

In the above description of the pneumatic circuit 24a, the air tubes 33d and 33e are connected to the head side port 19b and the rod side port 19c of the air cylinder 19, respectively. It is also possible to have a structure in which air tubes 33e and 33d are respectively connected to 19c. In this case, although the order in which the piston rod 19a of the air cylinder 19 advances and retreats is reversed from the above explanation, the effect that the piston rod 19a of the air cylinder 19 repeats advancing and retreating at a predetermined period and the first pressure By changing the set values of the pilot pressures in the control valve 31a and the second pressure control valve 31b, the timing at which the piston rod 19a moves backward and the timing at which it advances can be individually changed.

The floating object collection device 1 described below is characterized by having a pneumatic circuit 24b, which will be described using FIGS. 13 to 15, instead of the pneumatic circuit 24a in the first embodiment.
FIG. 13(a) is a block diagram showing the configuration of a pneumatic governor (single) (hereinafter referred to as pneumatic circuit 24b), and FIG. 13(b) shows compressed air being supplied to pneumatic circuit 24b in FIG. 13(a). It is a figure showing the state where it supplied. Moreover, FIG. 14(a) is a diagram showing how the pilot pressure acts on the pilot port 35a of the air operated valve 35 in FIG. 13(b), and FIG. It is a figure showing the state where valve 35 was switched. Furthermore, FIG. 15 is a flowchart for explaining the operation of the pneumatic circuit 24b.
In addition, in FIGS. 13 and 14, the air tube through which the compressed air supplied from the air pressure supply source to the air cylinder 19 flows and the air tube through which the compressed air discharged from the air cylinder 19 flows are indicated by thick solid lines and thin lines, respectively. The solid line indicates the air tube through which the compressed air supplied from the pneumatic supply source flows to the air chamber 40 and the air operated valve 35, and the thick broken line indicates the air tube through which the compressed air discharged from the air chamber 40 and the air operated valve 35 flows. The air tube that is connected is shown by a thin dashed line.

As shown in FIG. 13(a), the pneumatic circuit 24b that controls the operation of the air cylinder 19 includes a manual valve 25 to which compressed air is supplied from an air pressure supply source (not shown) via an air tube 36e, and an air pressure circuit 24b that controls the operation of the air cylinder 19. Operate valve 35, air chamber 40, orifices 30a, 30c, pressure control valve 38, first speed control valve 31c and second speed control valve 31d, rapid exhaust valve 39, air tubes 36a to 36d and a branch tube 37.

In addition to five ports, the air operated valve 35 has a pilot port 35a and a spring 35b, and in the first state shown in FIGS. 13(a) and 13(b) and FIG. When pilot pressure acts on the pilot port 35a as shown in a), it switches to the second state shown in FIG. 14(b), and when the pilot pressure stops acting on the pilot port 35a in the second state, the spring 35b The structure is such that the second state is switched to the first state by the urging force of.

The manual valve 25 and the air operated valve 35 are connected via an air tube 36a, and an air chamber 40 is connected to a branch tube 37 that branches off from the air tube 36b. An orifice 30a and a quick exhaust valve 39 are installed in the branch tube 37 in this order from the side closest to the air operated valve 35, and an orifice 30c is installed at the exhaust port of the quick exhaust valve 39.
The air cylinder 19 has a head side port 19b and a rod side port 19c connected to the air operated valve 35 through air tubes 36b and 36c, respectively. In addition, the air tubes 36b and 36c are provided with a first speed control valve 31c and a second speed control valve 31d for the purpose of adjusting the speed of compressed air supplied to the head side port 19b and rod side port 19c of the air cylinder 19. are interposed respectively.
That is, the pneumatic circuit 24b has a structure in which the forward speed and backward speed of the piston rod 19a can be adjusted individually by operating the first speed control valve 31c and the second speed control valve 31d, respectively. Note that the air chamber 40 is connected to the pilot port 35a of the air operated valve 35 by an air tube 36d, and a pressure control valve 38 is interposed in the air tube 36d.

In FIG. 13(a), when the manual valve 25 is opened to communicate the air tube 36e and the air tube 36a, the air tube 36a and the air tube 36b communicate with each other at the air operated valve 35, so that an air pressure source (not shown) is connected to the air tube 36a. A part of the compressed air supplied to the air tube 36e is supplied to the head side port 19b of the air cylinder 19 through the air tube 36a and the air tube 36b, as shown by the thick solid line in FIG. 13(b).
As a result, the piston rod 19a of the air cylinder 19 moves forward (step S1 in FIG. 15). At this time, the compressed air discharged from the rod side port 19c is supplied to the air operated valve 35 via the air tube 36c, and then discharged into the atmosphere.
On the other hand, the rest of the compressed air supplied from the air tube 36a to the air tube 36b passes through the branch tube 37, the flow rate is controlled by the orifice 30a, as shown by the thick broken line, and then passes through the quick exhaust valve 39 to the air chamber 40. flows into the interior of.

When the internal pressure of the air chamber 40 gradually increases and reaches a value indicating the preset pressure (pilot pressure) for the pressure control valve 38, the compressed air flows out from the air chamber 40, and as shown in FIG. 14(a). The air is supplied to the pilot port 35a of the air operated valve 35 through the air tube 36d as shown by the thick broken line. Then, as this compressed air acts as pilot pressure, the air operated valve 35 switches from the first state shown in FIG. 14(a) to the second state shown in FIG. 14(b) (see FIG. 15). Step S2).
Note that when compressed air is no longer supplied to the air tube 36b from the air pressure supply source via the air tube 36e and the air tube 36a, the compressed air inside the air chamber 40 is instantly released to the atmosphere by the quick exhaust valve 39. As a result, the inside of the air chamber 40 becomes pressureless. Furthermore, when the air operated valve 35 enters the second state, the compressed air inside the air tube 36b and the branch tube 37 is released into the atmosphere via the air operated valve 35.

When the pilot pressure is set to a high value by operating the knob of the pressure control valve 38, the operation of the air operated valve 35 to switch from the first state to the second state is delayed, so the timing at which the piston rod 19a retreats is delayed. If the pilot pressure is set to a low value, the operation of the air operated valve 35 becomes faster, and the timing at which the piston rod 19a retreats becomes faster.
That is, in the pneumatic circuit 24b, the timing at which the piston rod 19a retreats can be adjusted by operating the pressure control valve 38. Note that the timing of the piston rod 19a can also be adjusted by changing the diameters of the orifices 30a and 30c and the volume of the air chamber 40.

When the air operated valve 35 enters the second state, the air tube 36a and the air tube 36c communicate with each other in the air operated valve 35, so that air is supplied from an air pressure supply source (not shown) to the air tube 36a via the air tube 36e. The compressed air is supplied to the rod side port 19c of the air cylinder 19 through the air tube 36c as shown in FIG. 14(b).
As a result, the piston rod 19a of the air cylinder 19 retreats (step S3 in FIG. 15). The compressed air discharged from the head side port 19b is supplied to the air operated valve 35 via the air tube 36b, and then discharged into the atmosphere.
Furthermore, when the air operated valve 35 is in the second state, compressed air is no longer supplied from the pneumatic supply source to the second air tube 36b via the air tube 36e and the air tube 36a. As a result, as described above, the compressed air remaining inside the air chamber 40 is instantly released into the atmosphere by the quick exhaust valve 39, and the inside of the air chamber 40 becomes unpressurized, so that the pilot port 35a is connected to the pilot port 35a. Pressure no longer acts. As a result, the air operated valve 35 is switched from the second state to the first state by the biasing force of the spring 35b (step S4 in FIG. 15), and the pneumatic circuit 24b returns to the state shown in FIG. 13(b).

The pneumatic circuit 24b that includes the air operated valve 35 and the air chamber 40 is a pneumatic circuit that includes the first air operated valve 26 and the second air operated valve 27, and the first air chamber 28 and the second air chamber 29. Although the structure is simpler than 24a, it similarly has the effect of causing the air cylinder 19 to repeatedly move the piston rod 19a forward and backward at a predetermined period by supplying compressed air. Therefore, even in the floating object recovery device 1 equipped with the pneumatic circuit 24b, since a certain amount of scum 11a recovered from the coolant tank 4 is repeatedly supplied to the scum separation tank 2 at a predetermined period, the scum 11a is removed from the coolant. The effect of efficient recovery from 11b is also exhibited. Therefore, if the pneumatic circuit 24b is used instead of the pneumatic circuit 24a, the manufacturing cost of the floating object recovery device 1 can be reduced.

In the above description of the pneumatic circuit 24b, the air tubes 36b and 36c are connected to the head side port 19b and the rod side port 19c of the air cylinder 19, respectively. It is also possible to have a structure in which air tubes 36c and 36b are respectively connected to 19c. In this case, although the order in which the piston rod 19a of the air cylinder 19 advances and retreats is reversed to that described above, the effect that the piston rod 19a of the air cylinder 19 repeats advancing and retreating at a predetermined period is similarly achieved. Ru. However, when the set value of the pilot pressure in the pressure control valve 38 is changed, the timing at which the piston rod 19a moves forward rather than the timing at which it retreats changes.

The floating object recovery device of the present invention is capable of removing scum and oil floating on the liquid surface of a coolant used for lubrication and cooling during primary processing (forming processing using forging, heading, etc.) and secondary processing (grinding finishing processing) in machine tools. It can be used to collect floating objects such as

1... Floating object collection device 2... Scum separation tank 2a... Scum discharge port 2b... Scum supply port 2c... Coolant discharge port 2d... Side plate 2e... Separation chamber 2f... Clear liquid storage chamber 2g... Bottom plate 2h... Level 2i... Opening 2j ...Scum discharge chute 2k...Lower edge 3...Coolant discharge pipe 3a, 3b...L-shaped pipe 3c...Liquid level adjustment socket 3d...Lower end 3e...Upper end 3f...Straight pipe 4...Coolant tank 5...Float suction 5a...Suction port 6 …Scum suction pipe 7…Filter 8…Air-driven diaphragm pump 9…Scum tank 10…Mounting plate 11a…Scum 11b…Coolant 11c…Liquid level 12…Partition plate 12a…Liquid passage port 12b…Screw insertion hole 13…Scum supply pipe 13a...Connection pipe 13b...Straight pipe 13c...L-shaped tube 13d...T-shaped tube 14a, 14b...flat plate part 14c...connection part 15...suction cup 15a...bottom surface 15b...side surface 15c...through hole 15d...guide hole 15e...upper end surface 16...Connection plate 16a...Arm portion 16b...Lower surface 16c...Upper surface 17a, 17b...Bolt 18...Float 19...Air cylinder 19a...Piston rod 19b...Head side port 19c...Rod side port 20...Suspension rod 20a...Upper end 20b...Lower end 21... Stopping nut 22a... Collar 22b... Washer 22c... Floating joint 23... Guide pin 23a... Upper end 23b... Lower end 24a, 24b... Pneumatic circuit 25... Manual valve 26... First air operated valve 26a... First pilot port 26b...Spring 27...Second air operated valve 27a...Second pilot port 27b...Third pilot port 28...First air chamber 29...Second air chamber 30a-30c...Orifice 31a...First pressure Control valve 31b...Second pressure control valve 31c...First speed control valve 31d...Second speed control valve 32a...First rapid exhaust valve 32b...Second rapid exhaust valve 33a-33h...Air tube 34a... First branch tube 34b...Second branch tube 35...Air operated valve 35a...Pilot port 35b...Spring 36a-36e...Air tube 37...Branch tube 38...Pressure control valve 39...Rapid exhaust valve 40...Air chamber 41... Suction cup 41a...slit 41b...lowest part

Claims (9)

A floating object collection device that collects floating objects such as scum and oil floating on the liquid surface of a coolant used for lubricating and cooling machining parts in machine tools,
a coolant tank in which the coolant is stored together with the floating object;
The coolant tank has a float made of a member having a specific gravity smaller than that of the coolant, and is floated on the liquid surface of the coolant so that the floating objects floating on the liquid surface of the coolant flow into the inside. A float suction installed inside the
a floating object separation tank having a floating object discharge port, a floating object supply port, and a coolant discharge port;
a floating object suction pipe having one end connected to the floating object supply port of the floating object separation tank and the other end connected to the suction port of the float suction;
a pump that sends the floating object from the float suction to the floating object separation tank via the floating object suction pipe;
a pneumatic circuit that controls the operation of the air cylinder so that the piston rod periodically moves forward and backward ;
The float suction is
a connecting plate to which the float is connected;
the air cylinder installed on the connecting plate with the tip of the piston rod facing downward;
A floating object recovery device comprising: a suction cup in which the suction port is provided at a lower portion and is connected to the tip of the piston rod in an upwardly open position. a first air operated valve having a first pilot port and a spring and to which compressed air is supplied via a first flow path;
a second air operated valve having a second pilot port and a third pilot port and connected to a first branch flow path branching from the first flow path;
a second flow path and a third flow path connecting the second air operated valve and the first cylinder port and second cylinder port of the air cylinder, respectively;
a second branch flow path connecting the third flow path and the first pilot port;
a first air chamber and a second air chamber connected to the first air operated valve via a fourth flow path and a fifth flow path, respectively;
a sixth flow path connecting the second pilot port and the first air chamber; and a seventh flow path connecting the third pilot port and the second air chamber;
a first pressure control valve and a second pressure control valve respectively interposed in the sixth flow path and the seventh flow path,
In the first air operated valve, when a first pilot pressure acts on the first pilot port, the first flow path and the fourth flow path communicate with each other, and the air flow in the fifth flow path is controlled. From a first state in which the compressed air is released into the atmosphere, the first flow path and the fifth flow path communicate with each other, and the compressed air in the fourth flow path is released into the atmosphere. while switching to the second state, when the first pilot pressure no longer acts on the first pilot port, the second state switches to the first state due to the biasing force of the spring,
When a second pilot pressure acts on the second pilot port, the second air operated valve causes the first branch flow path and the second flow path to communicate with each other, and also causes the inside of the third flow path to be communicated with each other. and from a third state in which the compressed air in the second branch flow path is released into the atmosphere, the first branch flow path and the third flow path communicate with each other, and the inside of the second flow path switches to a fourth state in which the compressed air is released into the atmosphere, whereas when a third pilot pressure acts on the third pilot port, the fourth state switches to the third state. The floating object recovery device according to claim 1 , characterized in that: an air operated valve having a pilot port and a spring and to which compressed air is supplied through a first flow path;
a second flow path and a third flow path that connect the air operated valve to a first cylinder port and a second cylinder port of the air cylinder, respectively;
an air chamber connected to a branch flow path branching from the second flow path;
a fourth flow path connecting the air chamber and the pilot port;
A pressure control valve interposed in the fourth flow path,
In the air operated valve, when pilot pressure acts on the pilot port, the first flow path and the second flow path communicate with each other, and the compressed air in the third flow path is released into the atmosphere. a second state in which the first flow path and the third flow path communicate with each other and the compressed air in the second flow path and the branch flow path is released into the atmosphere; The second state is switched to the first state by the biasing force of the spring when the pilot pressure stops acting on the pilot port. Floating object collection device. a guide pin installed parallel to the moving direction of the piston rod and having an upper end fixed to the connecting plate;
2. The floating object recovery device according to claim 1, wherein the suction cup is provided with a guide portion that guides the guide pin in parallel to the moving direction of the piston rod. 2. The floating object collection device according to claim 1, further comprising a rod-shaped body having the tip end of the piston rod connected to an upper end and the lower end connected to the suction cup. A locking nut is provided on the inner circumferential surface of the tip of the piston rod, and the female screw thread is engaged with the male thread provided on the outer circumferential surface of the tip of the piston rod.
The rod-shaped body is a cylindrical suspension rod with a female thread provided on its inner peripheral surface that engages with the male thread of the piston rod,
The tip of the piston rod is screwed into the upper end of the suspension rod, and the locking nut is installed at the upper end of the suspension rod with the tip of the piston rod screwed into the upper end. The floating object recovery device according to claim 5 , characterized by: a cylindrical body loosely inserted into a through hole provided on the bottom surface of the suction cup;
a bolt inserted into the cylindrical body from below the suction cup;
a washer installed between the cylindrical body and the suspension rod with the bolt inserted therein;
7. The floating object recovery device according to claim 6 , wherein the lower end of the suspension rod is fixed to the suction cup by the bolt. 7. The floating object recovery device according to claim 6 , wherein the piston rod and the suspension rod are connected via a floating joint. A floating object collection device that collects floating objects such as scum and oil floating on the liquid surface of a coolant used for lubricating and cooling machining parts in machine tools,
a coolant tank in which the coolant is stored together with the floating object;
The coolant tank has a float made of a member having a specific gravity smaller than that of the coolant, and is floated on the liquid surface of the coolant so that the floating objects floating on the liquid surface of the coolant flow into the inside. A float suction installed inside the
a floating object separation tank having a floating object discharge port, a floating object supply port, and a coolant discharge port;
a floating object suction pipe having one end connected to the floating object supply port of the floating object separation tank and the other end connected to the suction port of the float suction;
a pump that sends the floating object from the float suction to the floating object separation tank via the floating object suction pipe,
The float suction is
a connecting plate to which the float is connected;
an air cylinder installed on the connecting plate with the tip of the piston rod facing downward;
The floating object separation tank includes a suction cup in which the suction port is provided at the bottom and is connected to the tip of the piston rod in an upwardly open position .
a separation chamber in which the floating object supply port and the floating object discharge port are provided;
A clear liquid storage chamber provided with the coolant outlet,
The floating object recovery device is characterized in that the separation chamber and the clarified liquid storage chamber are connected at a lower part of the floating object separation tank.

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