JP2001150292A - Application device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically and stably supply a liquid to be applied, while eliminating the need for adjusting a flow regulating valve or the like each time the bores of a spitting hole in a machining blade and a spray nozzle are varied. SOLUTION: A flow regulating portion consisting of a valve element 38 for varying the closed area of an air flow passage 31 and a normally open pore 37 and adapted for varying the amount of air A mixed in oil O according to the amount of spit air is provided in the air flow passage 31 for constricting the flow passage and thus causing a differential pressure therein.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus for applying a coating liquid such as oil used for cutting to an object to be coated, and more particularly to a coating apparatus for applying a small amount of coating liquid stably. is there.

[0002]

2. Description of the Related Art Conventionally, when cutting a metal material, a synthetic resin material, or the like, a coating liquid such as a lubricating oil is used for lubricating the surface of a workpiece and preventing deformation due to heat generation and cooling for protecting a tool. Is applied. To apply these coating liquids, air and the coating liquid are fed using a pump or the like, and a spray nozzle separately mounted separately from a blowing hole at a tip of a blowing channel or a processing blade provided in the processing blade itself. Is applied to the workpiece from the tip.

[0003] In recent years, research and development for minimizing the amount of coating and converting it into a mist has been conducted and implemented in view of environmental problems and saving of oils. Here, when the processing blade and the spray nozzle are replaced according to the size of the workpiece, the diameter of the nozzle usually differs. In this case, in order to uniformly mist the coating liquid in accordance with the amount of blown air and obtain a good spray state, adjust the oil amount adjustment valve to supply the necessary minimum amount of coating liquid, etc. Is being done.

[0004]

However, in the conventional oil application device, the oil amount adjusting valve must be readjusted every time a cutting blade having a different diameter or a spray nozzle is replaced, or a supply pump is used. In such a case, the number of reciprocations of the piston had to be adjusted, which was very troublesome and troublesome. In addition, the operator sometimes forgets to perform the adjustment operation and wastes the oil, or conversely, the cutting is insufficient due to insufficient spraying.

Therefore, the present invention eliminates the need to adjust the liquid amount adjusting valve and the like every time the diameter of the blowing hole of the processing blade and the diameter of the spray nozzle is changed, and automatically and stably supplies the coating liquid. It is an object to provide a device.

[0006]

According to a first aspect of the present invention, there is provided a coating apparatus in which air supplied from an air supply source for application is introduced and guided to a blowing side, and supplied from a coating liquid container. A coating liquid flow path for introducing the applied coating liquid and feeding it to a coating liquid supply unit provided in the middle of the air flow path to be mixed with air flowing through the air flow path; and a coating liquid flow path provided in the middle of the air flow path. A valve element having an opening that varies the closed area of the flow path and generates a differential pressure between the front and rear flow paths that changes the mixing amount of the coating liquid into the air in accordance with the amount of the blown air. Things.

According to a second aspect of the present invention, there is provided a coating apparatus which introduces air supplied from an air supply source for application and guides the air to a blowing side, and introduces a coating liquid supplied from a coating liquid container. A coating liquid flow path that is fed to a coating liquid supply unit provided in the middle of the air flow path and mixed with air flowing through the air flow path,
In the middle of the air flow path, a valve body is provided to narrow the flow path to generate a pressure difference in the air flow path, and includes a valve body that varies a closed area of the flow path, and a fine hole that is always open. ,
And a flow rate adjusting unit for changing the mixing amount of the coating liquid into the air in accordance with the blown air amount.

According to a third aspect of the present invention, there is provided the coating liquid opening / closing section provided in the middle of the coating liquid flow path according to the first or second aspect. A pilot flow path for sending air from an air supply source and providing an opening / closing command for the coating liquid opening / closing unit is provided,
A control valve for controlling the flow of air from the air supply source to the pilot flow path is provided.

According to a fourth aspect of the present invention, there is provided a coating device, wherein the outlet side of the air flow path according to any one of the first to third aspects is provided with:
A mixing unit is provided which promotes mixing of the air and the coating liquid by branching once in a plurality of directions and then joining again.

According to a fifth aspect of the present invention, a wire net is attached to the mixing section according to the fourth aspect in a direction perpendicular to the flow direction of the air and the coating liquid.

According to a sixth aspect of the present invention, there is provided a coating apparatus which branches from the air flow path according to any one of the first to fifth aspects,
A pressure feed channel for feeding air from an air supply source into the coating solution container to feed the coating solution is provided, and a replenishing cap is detachably attached to the coating solution supply port, and in the middle of the pressure feeding channel. And a shielding unit that stops the pressure feeding by blocking the pressure feeding channel when the replenishing cap is removed at the time of replenishment.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the drawing, a coating apparatus 1 pumps oil O in an oil container 11 contained therein by using air A supplied from an air supply source (not shown), and feeds oil O from a blowing hole of a processing blade at a tip or a spray nozzle. It blows out mist.

A replenishing cap 13 for replenishing oil O into the oil container 11 from a replenishing port 12 is provided on an upper surface of the coating device 1.
Is removably mounted. The rising pipe 14 rises from the bottom of the oil container 11 and reaches the bottom of the cylinder 15. An O-ring 16 is attached to the outer periphery of the bottom surface of the cylindrical body 15, and a sphere 17 is abutted on the O-ring 16 so as to be separated upward. A cylindrical valve element 18 is housed in the upper part of the cylindrical body 15 so as to be vertically movable against the urging force of a coil spring 19. An O-ring 20 is attached to the ceiling of the cylindrical body 15, and is brought into contact with the upper surface of the cylindrical valve body 18 so that the oil O in the riser pipe 14 and the cylindrical body 15 is removed.
Is prevented from flowing upward. A pressing valve 21 is provided at an upper portion of the cylindrical body 15, and the cylindrical valve body 1 is provided with a pressing valve 21.
8 to control the oil O in the cylindrical body 15 to flow to the upper side of the cylindrical body 15. The O-ring 22 fitted to the pressing valve 21 is
By contacting the pressure valve 1, the oil O flowing through the gap between the O-ring 20 and the cylindrical valve element 18 is prevented from leaking upward from the pressing valve 21. A passage 23 branching laterally is provided at the upper part of the cylindrical body 15. The pressing valve 21 is configured to be pressed by air A supplied from an air supply source.

An oil amount control valve 24 is attached to the outflow side end of the laterally branched passage 23, and an oil drop falling space portion 25 below the oil amount control valve 24 from the passage 23 by a plunger at the tip. The amount of oil flowing inward is roughly adjusted. A thin tube 26 is vertically provided in the oil drop falling space portion 25, and the inner diameter of the thin tube 26 is formed to a size such that the oil O falls as an oil droplet 27 from the lower end opening. A drop hole is provided at the bottom of the oil droplet drop space portion 25, and a passage 28 hangs down from the drop hole, and an opening 29 at the tip thereof forms a joining space 39 where the air A and the oil O join and flow. It comes to face in. The flow path from the oil container 11 to the junction space 39 via the cylindrical body 15 corresponds to a coating liquid flow path in the claims.

On the other hand, as for the air A supplied from an air supply source such as a compressor, the air A flowing from a supply port is used.
Flow path 3 that guides the air to the blow hole or the spray nozzle of the machining blade
1 is provided, and a pilot flow path 32 branching from the air flow path 31 and leading to the pressing valve 21 and an opening / closing valve 41 described later is provided.
A pressure feed channel 33 is provided for branching in the other direction from 1 and communicating with the inside of the oil container 11 to pump oil O.

First, the air passage 31 communicates with the inside of the adjustment plug 34 from the upper opening 35 of the adjustment plug 34 embedded in the side of the coating apparatus 1 and then bends rightward in FIGS.
Here, it communicates with the flow hole 36 and the fine hole 37. The adjusting plug 34 has a substantially cylindrical shape having a step, and an O-ring 34a and an O-ring 34b for sealing are attached to the outer peripheral portion.

As shown in FIG. 3 when the adjusting plug 34 is viewed from the front, the flow hole 36 has a round hole shape and is a through hole having an inner diameter of about 3 mm smaller than the inner diameter of the merging space 39. The outlet is closed releasably by an annular valve body 38 fitted to the front of the adjusting plug 34. The valve body 38 is made of an oil-resistant rubber sealing material such as silicon rubber, a sealing material made of synthetic resin, or a thin metal material. The valve body 38 has flexibility and is subjected to a differential pressure across the valve body 38 as shown in FIG. Then, it is pressed rightward, and bends rightward with the fitting portion with the adjustment plug 34 as a fulcrum. Therefore, the amount of deflection of the valve body 38 in the flow hole 36 changes due to the pressure difference between the front and rear. When the pressure difference is extremely small, the flow hole 36 is closed without bending the valve body 38. On the other hand, the micro holes 37 are always open,
As shown in FIG. 3, the through hole has a round hole shape and a diameter of about 1 mm.

The flow holes 36 and the fine holes 37
Is communicated with the passage from the upper opening 35 by being drilled from the front side of the adjusting plug 34, and can be easily inserted into the coating device 1 by attaching the adjusting plug 34 to the side wall of the coating device 1. Can be formed.

The flow hole 36 is provided with the adjusting plug 3.
Preferably, it is provided on the outer peripheral side away from the axis of No. 4. This is because the amount of change in the gap between the opening of the flow hole 36 and the valve body 38 due to the change in the differential pressure increases, and the responsiveness of the opening degree to the differential pressure is good.

The outflow sides of the flow holes 36 and the fine holes 37 are connected to the air A passing through these holes and the oil drop space 25.
Space 39 in which the oil O flowing down from the water is merged and mixed
Is connected to Opening 29 in this joining space 39
A step 40 is formed at the rear of the step, and the air A sucks the oil O and collides with the step 40 to promote the mixing. The flow of the outflow portion of the merging space 39 to and from the O-ring 42 is controlled by the opening and closing valve 41 moving up and down. The open / close valve 41 moves upward when air A flowing through the pilot flow path 32 is pressed against the urging force of the coil spring 43.

At the outflow side of the junction space 39, the passage is
After branching in the direction, the air A and the oil O are further finely and uniformly mixed by joining and colliding with the mixing space 44 again. The mixing space 44
A wire net 45 is attached to the inflow port to the hopper. The outflow side of the mixing space 44 is connected to the hose 2, and a tip of the hose 2 is connected to a processing blade or a blowing nozzle (not shown) having a blowout hole.

On the other hand, a control valve 51 for controlling the opening and closing of the air A to the pilot flow path 32 is attached to an inlet of the pilot flow path 32 branched from the supply section of the air flow path 31. Alternatively, a command to automatically start and stop spraying is issued.

The pressure feed passage 33 branched from the air passage 31 flowing from the side of the coating apparatus 1 is a cylindrical body 52 containing a sphere 53, a coil spring 54 and an O-ring 55.
And further bent laterally from above the cylindrical body 52,
After communicating with the supply path 56, it is connected to the oil container 11.

Here, when the replenishing cap 13 is mounted, the lower surface thereof pushes down the sphere 53 against the urging force of the coil spring 54, so that the air A supplied from the air supply source is supplied from the cylinder 52. The oil container 1 is guided into the supply path 56 and presses the oil level in the oil container 11.
The oil O in 1 is pressure-fed above the riser 14. On the other hand, when the supply cap 13 is removed, the pressing of the sphere 53 by the supply cap 13 is released, and the sphere 53 moves upward by the urging force of the coil spring 54 and comes into contact with the O-ring 55 in the cylinder 52. So air A
Of the oil O in the oil container 11 is released by the
When the oil O is supplied from the oil supply source 2, the oil O in the oil container 11 is supplied to the riser pipe 14 and the supply path 5 by the air pressure from the air supply source.
Blowing through 6 is prevented.

Next, the operation of the coating apparatus of the present embodiment configured as described above will be described. First, as shown in FIG.
In a state where the control valve 51 is OFF, the air A from the air supply source does not press the pressing valve 21 and the opening / closing valve 41, so that the upper surface of the cylindrical valve body 18 abuts on the O-ring 20 by the urging force of the coil through ring 19. , Oil O in oil container 11
Is prevented from being dripped from this portion into the joining space 39 through the passage 23 and the oil drop falling space portion 25. Further, the opening / closing valve 41 is lowered by the urging force of the coil through ring 43 and comes into contact with the O-ring 42 to shut off the flow of the air A and the oil O. At this time, the air A of the air supply source also flows into the pressure supply flow path 33, and descends along the supply path 56 through the gap between the sphere 53 pushed down by the supply cap 13 and the O-ring 55, so that the oil container 11 is pressed against the oil O. However, the oil O in the oil container 11 tends to rise in the cylinder 15 from the riser pipe 14 due to the air pressure applied to the oil container 11, but flows through the cylindrical valve 18 and the O-ring 20 as described above. Is stopped, so that the oil O stops while being stored in the cylindrical body 15.

Next, as shown in FIG.
N, the air A from the air supply source flows through the pilot flow path 32, presses the pressing valve 21, and
Push up. As a result, the cylindrical valve element 18 is pushed down in the cylindrical body 15 against the urging force of the coil through ring 19, so that a gap is generated between the cylindrical valve element 18 and the O-ring 20,
The oil O retained in the cylindrical body 15 immediately passes through the gap between the cylindrical valve body 18 and the O-ring 20 and the oil drop falling space 25
And is sucked into the joining space 39. At this time,
The sphere 17 of the cylinder 15 is filled with the oil O in the oil container 11 by the rising pipe 14.
The oil O floats upward due to the rising flow pressure, the gap with the O-ring 16 opens, and the oil O flows upward. Oil control valve 24
Is roughly adjusted in advance to an opening degree according to the spray amount of oil O,
The oil O drops in an oil droplet state in the oil droplet falling space 25.

On the other hand, a part of the air A passing through the control valve 51 pushes up the opening / closing valve 41, so that the outflow side passage of the joining space 39 is opened. As a result, the air flow source 31
A is sent to the mixing space 39 and flows into the mixing space 44.
Is guided to a blow hole or a spray nozzle of a processing blade, and is blown to a workpiece.

At this time, a flow hole 36 and a fine hole 37 are provided between the air flow path 31 and the junction space 39, and the flow hole 3
6 is covered with a valve body 38, and when the valve body 38 is opened, a flow rate equal to the flow rate blown out from the blowing hole or the blowing nozzle of the processing blade at the tip is supplied into the joining space 39. As a result, the pressure in the flow path in front of the valve body 38 and the fine holes 37 is equal to the supply pressure, while the pressure in the junction space 39 behind the valve body 38 is low. The differential pressure on both sides of the valve body 38 and the fine hole 37 at this time depends on the diameter of the blowout hole of the processing blade or the diameter of the spray nozzle. In other words, when these diameters are large, a large amount of air A flows in the joining space 39, so that the differential pressure increases. Therefore, the pressure in the merging space 39 is greatly reduced, and the amount of oil O falling from the opening 29 is also large. On the other hand, when the diameter is small, the amount of air A flowing in the junction space 39 is also small, so that the differential pressure is small, so that the pressure drop in the junction space 39 is also small, and the oil from the opening 29 is small. The amount of O fall is also small.

Thus, if the amount of air blown out from the tip is large, the amount of oil O dripped from the opening 29 is correspondingly large. Conversely, if the amount of blown air is small, the amount of oil O dripped from opening 29 will be correspondingly small. As a result, the mist content of the oil O in the blown air changes in accordance with the blown air amount, and is always blown at a constant and uniform mixing ratio.

Here, the air flow path 31 which is a feature of the present invention is described.
The operation of the flow rate adjusting unit including the valve body 38 and the fine hole 37 that cover the flow hole 36 provided in the middle of the path will be described. In the present embodiment, in addition to the valve element 38, a fine hole 37 having a very small hole diameter and always opening is provided. When the amount of blown air is small, the fine holes 37 have a function of sufficiently reducing the differential pressure accordingly and stably dropping a small amount of oil O. That is, since a pump or the like is usually used as the air supply source, the air supply source pulsates or fluctuates, and the pressure of the air A sent out there fluctuates slightly. For this reason, if only the flow hole 36 is used, the amount of deflection of the valve body 38 due to the differential pressure is small when the amount of blown air is very small, so that the valve body 38 intermittently closes the opening of the flow hole 36 due to pulsation or the like. And the dropping speed of the oil O also tends to fluctuate and become unstable. However, since the fine holes 37 which are always open are provided, the flow holes 3 are required when the amount of blown air is small.
Even if the valve 6 is repeatedly opened and closed by the valve body 38, the open state is maintained by the micro holes 37, so that the air A and the oil O flow stably as a whole.

On the other hand, when the amount of the blown air is large, the differential pressure increases accordingly, the amount of deflection of the valve body 38 of the flow hole 36 increases, and the air flow rate also increases. Therefore, the oil O is also supplied stably in accordance with the amount of blown air.

Next, the uniformization of the mist concentration will be described. Assume that the air pressure supplied from the air supply source is 5 atm, the air flow rate at that time is a, the diameter of the blowout hole of the processing blade is 3 mm, and the joining space 39 when the oil amount adjustment valve 24 is roughly adjusted. Is 2 atmospheres, that is, the differential pressure on both sides of the valve body 38 and the fine hole 37 is 3 atmospheres, and the oil flow rate is b, the mist concentration becomes b / a.

Next, when the processing blade is replaced with a processing blade having a diameter of 1 mm, the air A blown from the blowing hole of the processing blade is changed.
If the internal pressure of the joining space 39 is assumed to be 4 atm at the flow rate of a ′ and the supply pressure of 5 atm, the differential pressure on both sides of the valve element 38 and the fine hole 37 is reduced to 1 atm. Since the flow rate of the air A in the inside decreases, the suction force of the oil O in the joining space 39 naturally decreases, the amount of the sucked oil O decreases accordingly, the oil flow rate becomes b ′, and the mist concentration becomes b. '/ a'. For this reason, the relationship between the blowout flow rate, the differential pressure, and the like and the hole diameters of the valve body 38 and the fine holes 37 is determined in advance, and the amount of deflection of the valve body 38 is set to an optimum value, so that the mist concentrations b / a and It is possible to make '/ a' approximately equal.

For this reason, in the flow rate adjusting section composed of the valve body 38 and the fine holes 37, the effect of adjusting the oil amount mainly by the valve body 38 is great in the region where the amount of blown air is large, and in the region where the amount of air is moderate, it is large. In the region where both the valve body 38 and the fine holes 37 function and the amount of blown air that is greatly affected by the pulsation of the air supply source is small, almost only the fine holes 37 can adjust the oil amount. Therefore, the fine holes 37 are set to have a size that allows a small amount of blown air to flow in a region that is greatly affected by pulsation of the air supply source.

As described above, the coating apparatus of the present embodiment narrows the air flow path 31
The valve 38 is provided to generate a differential pressure in the fluid, and comprises a valve body 38 that varies the closed area of the flow path, and a fine hole 37 that is always open, and the amount of oil O mixed into the air A corresponds to the amount of blown air. In this case, a flow rate adjusting unit that changes the pressure is provided.

Therefore, since the valve body 38 and the fine holes 37 are provided, the mist amount of the oil O in the air A is almost proportional to the blown air amount regardless of the size of the workpiece. The mist amount of the oil O in the air A is constant and uniform even if the amount of the applied oil O is very small. In particular, in recent years, the amount of oil to be applied tends to be reduced to a small amount, and even in this case, the oil O is applied uniformly and stably without being affected by the pulsation of the air supply source in accordance with the amount of blown air. it can. As a result, an optimal amount of oil is blown onto the workpiece without excess or shortage, so that a good lubrication state can be obtained, and deterioration of the working environment due to excessive mist of the oil O can be prevented. Then, even if the processing blades and the spray nozzles having different diameters are replaced, the mist concentration of the oil O that matches the blown air amount can be automatically obtained.
There is no need to readjust or adjust the number of reciprocations of the piston of the supply pump.

In the middle of the oil O flow path, a cylindrical valve element 18
Coil spring 19, O-ring 20, pressing valve 21
, And a control valve 51 for controlling the flow of air A from the air supply source to the pilot flow path 32. Therefore, the control valve 51
At the time of the FF, since the pressure feeding of the oil O from the cylindrical body 15 to the outflow side is in a stopped state, the passage 23, the oil
5 and the passage 28 are filled with oil O, and a large amount of oil O leaks into the junction space 39, and after the next spraying operation starts, excessive oil O
Can be prevented from being carried at once by the air A and excessively applied to the workpiece.

Further, a mixing section is provided at the outlet side of the air flow path 31 for branching once in two directions and then joining again in the mixing space 44. Therefore, mixing of the air A and the oil O is promoted, and the mist of the oil O can be uniformly applied to the workpiece. When the wire net 45 is attached to the mixing section 44 at right angles to the flow direction of the air A and the oil O, the oil O can be made into finer particles and mixed into the air A. However, this wire mesh 45 does not always need to be attached.

A pressure feed passage 33 is provided branching from the air passage 31, and the supply cap 1 is
3 is detachably mounted, and the pressure feed passage 3
In the middle of 3, there is provided a shielding part comprising a sphere 53, a coil spring 54 and an O-ring 55. Therefore, when the replenishing cap 13 is removed, the pressure feeding flow path 33 is blocked by the shielding portion, and the air pressure of the pressure feeding is not applied to the replenishing path 56 and the oil container 11.
6 does not flow backward. Therefore, the oil O can be supplied even during the spraying operation.

In addition, when the supply of the air A from the air supply source is cut off due to a stoppage of the processing operation, the pressurization of the oil container 11 by the air A in the pressure feed passage 33 is released. The oil O in 15 tries to return to the oil container 11 by its own weight,
The sphere 17 also falls on the O-ring 16 by its own weight at the same time and abuts on the O-ring 16 to seal the lower part of the cylinder 15, so that the oil O in the cylinder 15 remains as it is. Thereby, when the supply of the air A is restarted, for example, at the start of the next operation, the problem that the oil O is dropped into the joining space 39 immediately and only the air A is blown out at the start of the spraying can be solved.

In the above embodiment, the flow rate is adjusted by providing the valve body 38 and the fine holes 37. However, in the case of implementing the present invention, if there is almost no influence of pulsation of the air supply source, etc. The fine holes 37 can be omitted. This case corresponds to the first aspect of the present invention.

The diameters and the numbers of the flow holes 36 and the fine holes 37 in the above embodiment are not limited to these, but the supply pressure of the air A, the amount of the oil O dropped, the blowout hole of the processing blade, the spray nozzle The optimum value may be selected according to the caliber of the lens. For example, when one fine hole 37 and two flow holes 36 are provided along the outer periphery of the adjustment plug 34, or when a plurality of flow holes 36 and fine holes 37 are provided, the diameters of the holes may be different from each other. Good. The cross section of each hole is not limited to the round hole shape, but may be a long hole shape along the circumference of the adjustment plug 34, or may be each hole, and the shape is not limited.

Further, in the above-described embodiment, the portion of the mixing space 44 as the mixing portion according to the present invention is shown as being once branched in two directions. However, the present invention is not limited to this. May be. And it is not necessary to necessarily provide a mixing part.

In the above embodiment, the coating liquid is
Although an example using oil O is shown, the present invention is not limited to this, and can be applied to various liquid materials applied in a mist using air.

[0045]

As described above, in the coating apparatus according to the first aspect, the closed area of the air passage is varied in the middle of the air passage,
A valve is provided having an opening to create a differential pressure between the front and rear flow paths in which the amount of application liquid mixed into air changes in accordance with the amount of blown air. Therefore, regardless of the size of the workpiece, the amount of mist of the coating liquid in the air changes almost proportionally with the amount of the blown air. The mist amount of the coating liquid is constant and uniform. This allows the coating liquid to be blown onto the workpiece without excess and deficiency, so that a good lubricating state can be obtained and the working environment can be prevented from deteriorating due to excessive spray of the coating liquid mist. Then, even if the processing blades and spray nozzles having different diameters are replaced, the mist concentration of the application liquid that matches the amount of the blown air can be automatically obtained. There is no need to readjust the adjustment or to adjust the number of reciprocations of the piston of the supply pump.

A coating device according to a second aspect of the present invention is characterized in that, in the middle of the air flow path, a valve body that changes the closed area of the flow path so as to narrow the flow path and generate a pressure difference in the air flow path, The flow rate adjusting unit includes fine holes in an open state, and changes a mixing amount of the coating liquid into the air in accordance with the amount of the blown air. Therefore, a small amount of coating liquid can be applied stably without being affected by pulsation of the air supply source.

According to a third aspect of the present invention, in the coating apparatus, a coating liquid opening / closing section is provided in the middle of the coating liquid flow path according to the first or second aspect. A pilot flow path for sending air from an air supply source and providing an opening / closing command for the coating liquid opening / closing unit is provided,
A control valve for controlling the flow of air from the air supply source to the pilot flow path is provided. Therefore,
In particular, since the feeding of the coating liquid to the outflow side is stopped, the coating liquid fills the flow path, and after the next spraying operation is started, excess coating liquid is carried by air and excessively applied to the workpiece. Can be prevented.

According to a fourth aspect of the present invention, there is provided the coating apparatus, wherein the air flow path according to any one of the first to third aspects is provided at an outlet side of the air flow path.
A mixing unit is provided which promotes mixing of the air and the coating liquid by branching once in a plurality of directions and then joining again. Therefore, in particular, the mixing of the air and the coating liquid can be promoted, and the mist of the coating liquid can be uniformly applied to the workpiece.

According to a fifth aspect of the present invention, a wire net is attached to the mixing section according to the fourth aspect in a direction perpendicular to the flow direction of the air and the coating solution. Therefore, in particular, the coating liquid can be made into finer particles and mixed into the air.

According to a sixth aspect of the present invention, there is provided a coating apparatus which branches off from the air flow path according to any one of the first to fifth aspects,
A pressure feed channel for feeding air from an air supply source into the coating solution container to feed the coating solution is provided, and a replenishing cap is detachably attached to the coating solution supply port, and in the middle of the pressure feeding channel. And a shielding unit that stops the pressure feeding by blocking the pressure feeding channel when the replenishing cap is removed at the time of replenishment. Therefore, especially when the replenishing cap is removed, the pressure feeding flow path is blocked by the shielding part, and the coating liquid in the coating liquid container does not flow backward in the replenishing path, thereby making it possible to apply the coating liquid even during the spraying operation. Liquid can be replenished.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state before coating in a coating apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state at the time of coating in the coating apparatus of FIG.

FIG. 3 is a front view showing an adjustment plug in the coating apparatus of FIG. 1;

FIG. 4 is a sectional view showing an oil flow path of FIG. 2;

FIG. 5 is a sectional view showing an oil supply port of FIG. 2;

6 is a sectional view showing an oil supply port at the time of supply in FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 coating device 11 oil container 12 supply port 13 supply cap 18 cylindrical valve element 19, 43, 54 coil spring 20, 42, 55 O-ring 21 press valve 31 air flow path 32 pilot flow path 33 pressure-feeding flow path 34 adjustment plug 36 circulation Hole 37 Micro hole 38 Valve body 39 Merging space 41 Opening / closing valve 44 Mixing space 45 Wire mesh 51 Control valve 53 Sphere A Air O Oil

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] July 10, 2000 (2007.1.
0)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006]

According to a first aspect of the present invention, there is provided a coating apparatus in which air supplied from an air supply source for application is introduced and guided to a blowing side, and supplied from a coating liquid container. A coating liquid flow path for introducing the applied coating liquid and feeding it to a coating liquid supply unit provided in the middle of the air flow path to be mixed with air flowing through the air flow path; and a coating liquid flow path provided in the middle of the air flow path. a valve body having an opening causing a blockage area of the flow path variable, and the differential pressure mixed amount of the air of the coating solution is changed in response to the blowing air volume between before and after the flow passage, the air Branch off the channel
Sending air from an air supply source into the coating solution container
A pressure feed channel for feeding the coating solution, and a pressure feed channel
At the time of replenishment.
As the supply cap is removed, the pressure feed passage is blocked.
And a shielding unit for shielding and stopping the pumping .

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

According to a second aspect of the present invention, there is provided a coating apparatus which introduces air supplied from an air supply source for application and guides the air to a blowing side, and introduces a coating liquid supplied from a coating liquid container. A coating liquid flow path that is fed to a coating liquid supply unit provided in the middle of the air flow path and mixed with air flowing through the air flow path,
In the middle of the air flow path, a valve body is provided to narrow the flow path to generate a pressure difference in the air flow path, and includes a valve body that varies a closed area of the flow path, and a fine hole that is always open. ,
A flow rate adjuster for changing the amount of the coating liquid mixed into the air in accordance with the amount of blown air;
The air from the supply source is sent into the coating liquid container to apply the coating liquid.
A pressure feed channel for feeding pressure, and
At the time of replenishment.
When the cap is removed, the pressure feed passage is blocked.
And a shielding unit for stopping the pressure feeding .

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Deleted

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0045

[Correction method] Change

[Correction contents]

[0045]

As described above, in the coating apparatus according to the first aspect, the closed area of the air passage is varied in the middle of the air passage,
A valve is provided having an opening to create a differential pressure between the front and rear flow paths in which the amount of application liquid mixed into air changes in accordance with the amount of blown air. Therefore, regardless of the size of the workpiece, the amount of mist of the coating liquid in the air changes almost proportionally with the amount of the blown air. The mist amount of the coating liquid is constant and uniform. This allows the coating liquid to be blown onto the workpiece without excess and deficiency, so that a good lubricating state can be obtained and the working environment can be prevented from deteriorating due to excessive spray of the coating liquid mist. Then, even if the processing blades and spray nozzles having different diameters are replaced, the mist concentration of the application liquid that matches the amount of the blown air can be automatically obtained. There is no need to readjust the adjustment or to adjust the number of reciprocations of the piston of the supply pump. Also pumping
The refill cap is removed during refilling in the middle of the flow path
As a result, a shielding section is provided to block the pumping flow path and stop pumping.
Pressure when removing the replenishing cap.
The feed channel is blocked by the shield, and the coating liquid in the coating liquid container is supplemented.
There is no backflow in the supply path. For this reason, during spraying work
Also, the application liquid can be supplied.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0046

[Correction method] Change

[Correction contents]

A coating device according to a second aspect of the present invention is characterized in that, in the middle of the air flow path, a valve body that changes the closed area of the flow path so as to narrow the flow path and generate a pressure difference in the air flow path, The flow rate adjusting unit includes fine holes in an open state, and changes a mixing amount of the coating liquid into the air in accordance with the amount of the blown air. Therefore, the same effect as the first aspect is obtained.
In addition, a small amount of coating liquid can be stably applied without being affected by pulsation of the air supply source.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0050

[Correction method] Deleted

Continued on the front page (72) Inventor Motohiro Tanaka 7-2-2-203, Tanimachi, Chuo-ku, Osaka-shi Tanaka Import Group Co., Ltd. F-term (reference) 3C011 EE01 EE09

Claims (6)

[Claims] 1. An air flow path for introducing air supplied from an air supply source for application and guiding the air to a blowing side, and introducing a coating liquid supplied from a coating liquid container to a middle of the air flow path. A coating liquid flow path which is fed into the coating liquid supply section provided in the air flow path and is mixed with air flowing through the air flow path; provided in the middle of the air flow path; And a valve element having an opening to generate a differential pressure between the front and rear flow paths, the pressure difference varying according to the amount of blown air. 2. An air flow path for introducing air supplied from an air supply source for application and guiding the air to a blowing side, and introducing an application liquid supplied from a coating liquid container to a middle of the air flow path. A coating liquid flow path that is fed into the coating liquid supply unit provided in the air flow path and mixed with the air flowing through the air flow path; and, in the middle of the air flow path, narrows the flow path to apply a differential pressure to the air flow path. It is provided to generate, consisting of a valve body that varies the closed area of the flow path, and micropores that are always open,
A coating apparatus, comprising: a flow rate adjusting unit that changes a mixing amount of a coating liquid into air in accordance with a blowing air amount. 3. A coating liquid opening / closing section is provided in the middle of the coating liquid flow path, and branches from the air flow path to send air from an air supply source to the coating liquid opening / closing section. 2. A pilot flow path for performing an opening / closing command is provided, and a control valve for controlling a flow of air from an air supply source to the pilot flow path is provided.
Or the coating device according to claim 2. 4. A mixing section which is provided at the outlet side of the air flow path to branch once in a plurality of directions and then join again to promote mixing of the air and the coating liquid. The coating device according to claim 3. 5. The coating apparatus according to claim 4, wherein a wire net is attached to the mixing section in a direction perpendicular to a flow direction of the air and the coating liquid. 6. A pressure feed channel which branches from the air flow channel, feeds air from an air supply source into the coating solution container and pressure feeds the coating solution, and a supply cap is provided at a supply port of the coating solution. In addition to being detachably attached, a shielding portion is provided in the middle of the pressure feeding channel, which shields the pressure feeding channel and stops the pressure feeding with the removal of the replenishing cap at the time of replenishment. The coating device according to any one of claims 1 to 5.