JPS5844027B2 - paint injection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is capable of accurately and reproducibly controlling the mixing state of paint and air and the jetting shape of the mixed flow over a wide range, and at the same time controlling the jetting shape and mixing state while painting. The present invention relates to a paint spraying device that can be controlled to be changed arbitrarily.

Conventionally, the spray gun G in this type of paint injection device is
As shown in Figure 1, the air required to mix liquid paint with air and atomize it (hereinafter referred to as atomizing air) and the spray shape of the atomized mixed flow (hereinafter referred to as pattern shape) )
Air for controlling (hereinafter referred to as pattern air)
are supplied from the same supply port 1 through the atomizing air supply path 2 and the patterning air supply path 3, respectively.

The pattern shape described above is changed by adjusting the pattern adjustment screw 4 screwed into the pattern air supply path 3 to change the flow rate of air supplied to the jet nozzle 6.

In the figure, 7 is a conduit consisting of a pipe or the like, through which the compressor C as a pressure supply source and the supply port 1 are communicated with each other in an airtight manner.

8 is connected to a paint supply source T via a pipe line 89 made of a hose or the like at the paint inlet.

9 is an air supply for operating the spray gun, and 10 is a piston that elastically supports a needle 11 that controls the amount of paint supplied inside.

13 is a paint needle backing, and 14 is an injection (pattern) shape adjustment valve, which controls the opening and closing of the pattern air supply path 3 depending on the degree of threading of the pattern adjustment screw 4.

S is the operating switch.

However, in the above-mentioned spray gun G, it is impossible to quantitatively grasp the air pressure (flow rate) supplied to each of the jet ports 5 and 6.

That is, even if pressurized air is supplied so as to maintain a constant pressure through the pressure regulating valve 15 and the pressure indicator 16 that are connected to each other in the conduit 7, the desired pressure can be adjusted by adjusting the threading of the pattern adjusting screw 4. Not only does the condition of the pattern air change, but also the condition of the atomizing air tends to change, making it difficult to accurately grasp the condition of the pattern air and atomizing air. This is the current situation.

For example, when using the above-mentioned spray gun G and setting the air pressure in the pipe line 7 at a constant value of 5 kg/-, and changing the threading of the pattern adjustment screw 4 in various ways, the total air flow rate in the pipe line 7 is When measuring the path γ, a relationship between the threaded state (rotation speed) of the pattern adjusting screw 4 and the amount of pressurized air discharged was obtained as shown in the second figure.

Referring to FIG. 2, this is the air flow rate when the pattern adjustment screw 4 is fully tightened, that is, when the pattern air supply path 3 is completely closed. ) indicates the flow rate of the atomizing air in the above-mentioned state.

When the pattern adjustment screw 4 is rotated in the opening direction, the pattern air supply path 3 is opened and the air flow rate is increased.

However, in this case, the increased portion (indicated by the symbol S in the figure)
is the total flow rate of pattern air and atomization air, and the flow rate is 300 Nl when the pattern adjustment screw 4 is at zero opening.
/, 4 cannot be said to be the flow rate of the atomizing air at that point in time.

Furthermore, if the number of rotations of the pattern adjustment screw 4 is increased, the total air volume will reach a saturated state, and even if it is rotated further, the air flow rate will not change, but even in this state, the atomization air and pattern adjustment There is a possibility that the distribution of air is changing.

As mentioned above, in a conventional spray gun, it is practically extremely difficult to know how pattern air and atomization air are distributed.

Furthermore, as is clear from the illustration in FIG. .

Moreover, FIG. 3 is a trend line diagram showing the threading adjustment of the pattern adjustment screw 4 in the above-mentioned spray gun G and the shape of the coating pattern.

That is, FIG. 3 shows the coating weight distribution within the pattern, with the horizontal axis representing the arrangement position of the objects to be coated, and the vertical axis representing the ratio to the total coating amount.

As is clear from this, how important is the thread adjustment of the pattern adjustment screw 4 in order to obtain the desired pattern shape, and how does the slight difference in adjustment affect the painted pattern? I can see it.

The above has explained the uncertainties in adjusting and setting the pattern air and atomizing air of the conventional general spray gun G, but another major drawback of this type of spray gun is Due to its structure, the atomization state of the paint and the shape of the pattern cannot be changed accurately and quickly during painting (this is a preset state).

The above-mentioned atomization state of the paint and the shape of the pattern may need to be changed or set arbitrarily during painting, for example, when painting objects of various shapes that are transported on a conveyor using a reciprocating cake. be.

In other words, when the surface to be coated is flat and wide, the width of the pattern shape is made wide, and on the other hand, when the surface to be coated is narrow such as a groove, the width of the pattern shape is made narrower so that it is easier to fit into the narrow part. If it is possible to switch and paint, it will be extremely effective in terms of work efficiency.

Furthermore, when painting objects with complex shapes using painting robots, etc., if it is possible to control the shape (accordingly, the width of the pattern shape and the atomization state), it will be possible to apply the painting extremely efficiently and uniformly. Therefore, it is possible to improve the painting accuracy.

However, there is no conventional paint spraying device that satisfies the above-mentioned requirements, and there is currently a strong demand for a paint spraying device that is practically satisfactory.

The present inventors devised the paint injection device of the present invention in order to solve the above-mentioned problems and promptly meet the above-mentioned demands.

The present invention has a paint supply passage that communicates with a paint supply source and supplies paint, and a pressurized air supply source (which communicates with the paint supply source and mixes the paint and air through the opening of the paint supply passage by expanding the pressurized air. a pressurized air supply path for spraying paint;
a pressure air supply path for controlling the mixed flow that communicates with a pressure air supply source and controls the spray shape of the mixed flow of paint and air through the pressure air supply source, thereby varying the shape of the coating applied to the object to be coated; It is an object of the present invention to provide a paint injection device in which the pressure or flow rate of pressurized air in the paint injection pressurized air supply path and the mixed flow control pressure air supply path are controlled, respectively.

According to the apparatus of the present invention, the pressure or flow rate of the pressurized air in the pressure air supply path for paint injection and the pressure air supply path for controlling the mixed flow can be controlled, respectively, so that the mixed state of the paint and air can be controlled. The pattern shape of the mixed flow can be controlled accurately and with good reproducibility over a wide range, and at the same time, the pattern shape and mixing state can be arbitrarily changed and controlled while coating, thereby increasing the coating precision and quality. obtain.

Furthermore, the device of the present invention is capable of extremely dense mixing even at low pressure (approximately 2 kg and 7 degrees or less) compared to conventional methods, and can significantly reduce air and improve coating efficiency. By appropriately selecting and combining the device with a reciprocator, robot, etc., even complex-shaped objects can be coated reliably and with high precision.

EMBODIMENT OF THE INVENTION Hereinafter, each embodiment of the paint injection device of the present invention will be described based on the drawings.

In the following embodiments, the same parts as those described above are denoted by the same reference numerals, and the description thereof will be omitted.

As shown in the fourth section, the paint spraying apparatus A1 of the first embodiment connects the installation spray gun G to the atomizing air supply path 2 and the patterning air supply path 3 (through which connects the compressor C), and A pressure control device v1 for controlling the pressure of the respective pressurized air is disposed in each of the supply passages 2 and 3 outside the main body g1 of the gun G1.

For this reason, the apparatus A1 of the first embodiment is designed so that the flow rate of pressurized air in the atomizing air supply path 2 and the patterning air supply path 3 can be controlled separately.

Specifically, as shown in FIGS. 5 to 7, an atomizing air supply path 2 and a patterning air supply path 3 are formed independently in the main body g1 of the spray gun G1. be.

As shown in FIG. 4, the atomizing air supply path 2 and the pattern air supply path 3 are provided with an atomizing pressure reducing valve 20a and a pattern, respectively, which can be operated from the outside, between the spray gun G1 and the compressor C. A pressure reducing valve 30a is provided.

Each of the pressure reducing valves 20a and 30a is configured as shown in FIG.
(Since the configurations of both are almost the same, only the former is shown as a representative, and the illustration and explanation of the latter are omitted.) The valve body 21
Inside the atomization supply path 2, a suction hole 22 and a discharge hole 23 are bored.

A diaphragm 24 is stretched inside the valve body 21 and partitions the inside into an upper chamber 25 and a lower chamber 26 in an airtight manner.

The upper chamber 25 is connected to the atmosphere through an opening 300, and a spring 27 is resiliently supported inside the upper chamber 25, and the resilient force of the spring 27 is applied to the diaphragm 24 by rotating a rotary knob 28 disposed on the outside. And the amount of displacement of the diaphragm 24 can be adjusted.

Further, the lower chamber 26 is divided into a first chamber 26a and a second chamber 26b, and a valve member 29 is elastically supported in the second chamber 26b by a spring 31. It can come into contact with the diaphragm 241.

This valve member 29 is loosely fitted into the inner cavity 32, and this inner cavity 3
The valve seat 33 formed at one end of the valve seat 26 can be seated on the valve seat 33, and communication between the first chamber 26a and the second chamber 26b can be cut off.

Then, the pressure reducing valve 20a moves the rotary knob 28 through the elastic force of the spring 26 and the suction hole 22 into the first chamber 26a.
By rotating the diaphragm 24 against the pressure of the inflowing pressurized air, the diaphragm 24 is displaced toward the second chamber 26b.

Along with this, the diaphragm 24 (valve member 29 in contact with the diaphragm 24 moves downward and separates from the valve seat 33, and the valve member 29 comes into contact with the diaphragm 24)
The suction hole 22 communicates between the chamber 26a and the second chamber 26b.
It is possible to supply pressurized air at a predetermined pressure to the discharge hole 23 or not.

As a result, in each of the pressure reducing valves 20a and 30b, the adjustment of the attachment and detachment between the valve member and the valve seat is made variable by the amount of displacement of the diaphragm 24 due to the elastic force of the spring 26 and the pressure of compressed air, and the The pressure of each pressurized air flowing to the atomizing air supply path 2 and the patterning air supply path 3 is independently controlled to be reduced.

The communication passage 34 communicating with the second chamber 26b in FIG. 7 is connected to a pressure gauge (not shown in detail) 35 which is to display the pressure value of the pressurized air supplied to the spray gun G1.

The device A1 of the first embodiment has each pressure reducing valve 20a and 30.
By separately controlling the pressure of the compressed air supplied from the compressor C to the atomizing air supply path 2 and the patterning air supply path 3 using So that it can be used over a wide range (
It happened.

That is, each of the pressure reducing valves 20a and 30a adjusts the pressure air supplied to the atomizing air supply path 2 and the patterning air supply path 3 to a predetermined value by independently rotating the rotary knobs 28 and 38, respectively. The pressure can be reduced to

From this point, in the device A1 of the first embodiment, the atomizing air and the patterning air can have a small difference in the former and a small difference in the latter, and vice versa. Furthermore, it is possible to control the force between the two.

For this reason, the spray gun G1 of the apparatus A1 of the first embodiment is
The system is excellent in practical use because it is possible to quantitatively grasp the supply air pressure to each of the jet ports 5 and 6 sufficiently and appropriately, and to ensure that each adjustment and setting of the atomizing air and patterning air is performed without malfunction. bring about an effect.

In addition, the apparatus A1 of the first embodiment has the effect of being able to accurately and quickly change the atomization state of the paint and the pattern shape to a preset state during painting.

Specifically, the apparatus A1 of the first embodiment is extremely effective for coating various shapes of objects to be coated, which are transported by a conveyor using a reciprocating cake or the like.

In other words, if the surface to be coated on the object to be coated is wide due to
In the device A of the first embodiment, the amount of pressure reduction of the pressure reducing valve 30a in the pattern air supply path 3 is made small, and the amount of pressure reduction of the pressure reducing valve 20a in the atomizing air supply path 2 is set to be small.

As a result, in the apparatus A1 of the first embodiment, the pressure of the patterning air is higher than that of the atomizing air, and the width of the pattern shape can be significantly expanded and formed wider than that of the conventional apparatus, which is impossible to achieve with the conventional apparatus. It is possible to apply a beautiful coating with an excellent pattern shape that has never been seen before, and work efficiency can be greatly improved.

Moreover, contrary to the above, when the surface to be coated of the object to be coated is a narrow portion having a depth such as a groove or a recess (this
Embodiment device A can fully demonstrate its power.

That is, in the device A1 of the first embodiment, the amount of pressure reduction of the pressure reducing valve 20a in the atomizing air supply path 2 is made small, and the amount of pressure reduction of the pressure reducing valve 30a in the pattern air supply path 3Q is made small.

As a result, the pressure of the atomizing air is higher than that of the patterning air, and the width of the pattern shape can be narrowed, and the narrow part G can be reliably adapted to the above-mentioned narrow part G, and the said part can be efficiently and highly This has the effect of allowing precision painting.

Furthermore, the apparatus A1 of the first embodiment can fully exhibit its power even when painting a complicated and special shaped object by appropriately combining it with a painting robot or the like.

That is, the apparatus A1 of the first embodiment adjusts the width of the pattern shape and the atomization state as described above (this is the shape of the object to be coated).
This can be controlled in response to the
This allows for effective and appropriate painting.

Furthermore, the device A1 of the first embodiment is extremely simple in its manufacture and can be sufficiently adapted to a wide range of requirements.

In addition, the device A1 of the first embodiment is different from the conventional device (this device atomizes the paint, and also plays an auxiliary role in setting the pattern shape with the atomizing air that determines the shape of the pattern, and influences the coating state of the paint). The pattern air to be used does not change at all due to mutual influence, and can be arbitrarily controlled precisely and over a wide range to meet desired conditions.

The trend line diagram shown in FIG. 8 is an example of the relationship between the flow rates of the atomizing air and the patterning air and the gauge pressures at the respective air supply ports 1 in the apparatus A1 of the first embodiment. However, by creating such a calibration curve in advance in the apparatus A1 of the first embodiment (this allows the gauge pressure to be set and the air flow rate to be adjusted to any desired air flow rate with good reproducibility at any time).

Moreover, FIGS. 9 and 9 illustrate the relationship between the respective set pressures of the atomizing air and patterning air (that is, the amount of air in relation to FIG. 8) and the coating pattern in the apparatus A1 of the first embodiment. 9 and 10, the horizontal axis represents the arrangement position of the objects to be coated, and the vertical axis represents the ratio to the total amount of coating, and This shows the weight distribution of each garment.

In the apparatus A1 of the first embodiment, if the relationship between the magnitude of the pressure of the atomizing air and the patterning air, or an equivalent appropriate combination, and the pattern shape is determined in advance, the combination can be adjusted as appropriate. By selecting a suitable coating pattern for the object to be coated, it is possible to obtain a coating pattern that is sufficient for practical use.

Incidentally, a case will be described in which the present inventors used the apparatus A1 of the first embodiment to coat an object having a deep groove as shown in FIG. 11 by means of a conveyor.

In addition, in order to adhere sufficient paint to the groove bottom Y portion of the object to be coated, coating was carried out by changing the combination of atomizing air and patterning air under the following conditions.

Note that the X part is a flat part of the object to be coated, and the numerical values in the figure indicate the shape and dimensions of the object to be coated (unit: 1n11L).

Paint flow rate 400 ml/mm Viscosity [FC
l2] 30sec Gun cycle 26 cycles/m07 Conveyor speed 1.4 m/mvt Atomization air pressure
X part 4 kg/cr? t (Engineering Department.

k, /-Air pressure for pattern The pattern is switched to pattern Y when the Y portion passes in front of the apparatus A of the first embodiment.

FIG. 12 shows the coating weight distribution within the pattern, with the horizontal axis representing the arrangement position of the objects to be coated and the vertical axis representing the proportion of the total coating amount.

According to the coating results using the apparatus A1 of the first embodiment, the film thickness was 30 μm in the X portion and 40 μm in the Y portion.

In contrast, when painting the X and Y parts with the same pattern using the conventional equipment, the X part was 30μ (while the Y part was less than 20μ).

Furthermore, the apparatus A1 of the first embodiment can prevent sagging defects from occurring when the object to be coated has a stepped protrusion edge, recessed edge, etc.

In other words, this device A1 immediately sets the patterning air to high pressure immediately before reaching the stepped protrusion edge or recess edge from the flat part of the object to be coated, thereby increasing the evaporation rate of the paint solvent and increasing the coating efficiency. By lowering the value, it is possible to completely eliminate the sagging defects that have conventionally occurred, which is fully satisfactory in practical terms.

In addition to the above, substantially the same effect as described above can be obtained even if the atomizing air is kept at a low pressure, or even by a combination of the two.

In summary, the first implementation device has the following effects.

○ Atomization air and pattern air were supplied separately, and the pressure (air amount) could be set independently for each.

O For this reason, if you determine the relationships between air pressure and flow rate (Figure 8), air pressure and pattern shape (Figure 9), and air pressure and coating amount (Figure 10) in advance, you can easily reproduce the conditions. Can be configured well.

0 If you find the air pressure that suits the shape and part of the object to be coated, you can synchronize it with the pressure control and instantly (coating under this optimal condition is possible.
It is extremely effective in practice as a multi-purpose gun.

A wide range of combinations, such as low atomization air pressure and high pattern air pressure, which are difficult to set with conventional devices, can be easily set.

Next, as shown in FIG. 13, the paint injection device A2 of the second embodiment is different from the first embodiment in that the main body g of the spray gun G2 is
The difference is that the atomizing air supply path 2 and the patterning air supply path 3 in 2 are provided with a flow rate control device (2) for controlling the flow rate of the respective pressurized air.

Thereby, the apparatus A2 of the second embodiment is capable of controlling the flow rate of pressurized air in the atomizing air supply path 2 and the patterning air supply path 3, respectively.

To be more specific, as shown in FIGS. 14 to 16, inside the main body g2 of the spray gun G2 (here, the atomizing air supply path 2 and the pattern air supply path 3) are connected from the outside. The atomization adjustment screw 20b and the pattern adjustment screw 30b, which are operable, are arranged in an airtight manner.

Each of the adjusting screws 20b and 30b has a valve member 41 and 51 at one end, respectively, and is inserted into a valve seat 43 and 5 provided in a threaded hole 42 and 52 drilled from the side of the main body g2.
3 can be seated.

Moreover, each stem 4 in each adjustment screw 20b and 30b
4 and 54 have threaded parts 45 and 55 on their outer peripheries, which are threaded into the inner cavities of lock nuts 46 and 56 which are integrally threaded into the threaded holes 42 and 52.

Also, lock nuts 46 and 56 and valve members 41 and 5
1, there are coil springs 47 and 57, respectively.
This is an intervention.

Each of the adjustment screws 20b and 30b has rotating knobs 48 and 58 at their open ends, which can be rotated (through which the threaded portions between the threaded portions 45 and 55 and the lock nuts 46 and 56 can be varied). be.

As a result, each of the adjustment screws 20b and 30b allows variable adjustment of the gap between the valve members 41 and 51 and the valve seats 43 and 53, and connects the compressor C to the atomizing air supply path 2 and the pattern air supply path. The flow rate of pressurized air to each of the air pumps 3 and 3 can be independently controlled.

The apparatus A2 of the second embodiment having the above-mentioned configuration has substantially the same effects as the first embodiment.

As shown in FIG. 17, the paint injection device A3 of the third embodiment connects the atomizing air supply path 2 and the patterning air supply path 3 in the main body g3 of the spray gun G3 to the compressor CTC. Branching path 70b from one air supply path 70a
The flow rate control device (3) is disposed in the branch path 70b.

Further, the atomizing air supply path 2 is provided with a constriction section 80 downstream of the flow rate control device (3).

As a result, the apparatus A3 of the third embodiment is capable of controlling the flow rates of pressurized air in the atomizing air supply path 2 and the patterning air supply path 3, respectively.

To be more specific, as shown in FIGS. 18 and 19,
In the main body g3 of the spray gun G3, there is an air supply path 70a.
Between the branch passage 70b that communicates with the atomization air supply passage 2 and the pattern air supply passage 3 (the atomization adjustment screw 20c and the pattern adjustment screw 3 that can be operated from the outside)
0c are arranged in a well airtight manner.

Each of the adjusting screws 20c and 30c has a valve member 71 and 81 at one end, respectively, and a valve seat 73 and 83 provided in a screw hole 72 and 82 bored from the side of the main body g3.
(It is possible to sit down.)

In addition, each stem 7 in each adjustment screw 20c and 30c
4 and 84 have threaded parts 75 and 85 on their outer peripheries, which are threaded into the inner cavities of lock nuts 76 and 86 which are integrally threaded into the threaded holes 72 and 82.

Also, lock nuts 76 and 86 and valve members 71 and 8
1 (here, coil springs 77 and 8, respectively)
7 is an intervention.

Each of the adjusting screws 20c and 30c has rotating knobs 78 and 88 at their open ends, and by rotating these knobs, the threaded portions between the threaded portions 75 and 85 and the lock nuts 76 and 86 can be varied.

As a result, the adjusting screws 20c and 30c can vary the gap adjustment between the valve members γ1 and 81 and the valve seats 73 and 83, and the atomizing air supply path 2 and the pattern air supply path 3 are connected to the branch path 70b. The flow rate of each pressurized air can be controlled independently.

The apparatus A3 of the third embodiment having the above configuration has substantially the same effects as those of each of the embodiments described above.

Next, the paint spraying device A4 of the fourth embodiment has an atomizing air supply path 2 and a patterning air supply path in the main body g4 of the manual spray gun G4, as shown in FIGS. 20 to 24. 3 is connected to the compressor C through one air supply path 90, and a flow rate control device v consisting of a spool valve 4 as a fixed throttle in the air supply path 90.
This device differs from the device of the above-described embodiments in that the device of the present invention is equipped with the device No. 4.

Further, the atomizing air supply path 2 is provided with a constriction section 80 downstream of the flow rate control device (4).

Furthermore, if the device A4 of the fourth embodiment is described in detail, the 20th embodiment
As shown in Figures 24 to 24, the main body g4 of the spray gun G4 includes an air supply passage 90 and an atomizing air supply passage 2.
Atomization and pattern adjustment screws 91, which can be operated from the outside, are arranged in a well-tight manner between the air supply path 3 and the pattern air supply path 3.

The adjustment screw 91 has spools 93a, 93b, 93c as a valve member 92 at one end.

93d are each coaxially connected and equipped.

These spools 93a to 93d are fitted in a cylinder 95 provided in a bottomed hole 94 bored from the side of the main body g4 so as to be able to reciprocate in the axial direction.

In the inner cavity of this cylinder 95, there are a first bypass 95a and a second bypass 95b having different flow path areas and communicating with the atomizing air supply path 2, as shown in FIG. 21, and a pattern air supply path 3. A first bypass 95c and a second bypass 96d, which communicate with each other, are bored facing each other.

These first bypasses 95a and 95c are the second bypass 95
b, the flow path area is larger than that of 95a.

A groove 95e is bored on the outer periphery of the spools 93b+93c as a flow path for pressurized air.

Further, the stem 96 at the other end of the adjustment screw 91 has a threaded part 97 on its outer periphery, which is integrally threaded into the opening of the bottomed hole 94 to provide good airtightness in the threaded holes of the lock nuts 1 to 98. It is screwed together.

Further, a coil spring 99 is interposed between the lock nut 98 and the stem 96.

The adjusting screw 91 has a rotating knob 100 at its open end, and by rotating the adjusting screw 91, the threaded portion between the threaded portion 97 and the lock nut 98 can be changed.

As a result, the adjustment screw 91 is attached to the spool 93a~
93d and each bypass 95a + of the atomizing air supply path 2
95 b, and the opening/closing control of the bypasses 95 c and 95 d of the pattern air supply path 3 is made variable, and the air supply path 90 is connected to the atomizing air supply path 2 and the pattern air supply path 3 . The flow rate of each pressure air can be controlled independently.

That is, in the position shown in FIG. 21, the valve member 92 is such that the spool 93c is in the first
The spool 93b closes the second bypass 95b and opens the second bypass 95d and the first bypass 95a, thereby reducing the pressure in the pattern air supply path 3. The air flow rate is made smaller than that of the atomizing air supply path 2.

Further, the valve member 92 is in the position shown in FIG.
Atomizing air supply path 2 (with regard to this, the spool 93b closes the second bypass 95d, and regarding the pattern air supply path 3, the spool 93a closes the first bypass 95a and opens the first bypass 95c and the second bypass 95b) By doing so, the flow rate of pressurized air in the atomizing air supply path 2 is made smaller than that in the patterning air supply path 3.

Furthermore, in the position shown in FIG. 23, the spool 93c connects the first bypass 95c and the second bypass 95d with respect to the atomizing air supply path 2, and the spool 93b connects the pattern air supply path 3 (with respect to the atomizing air supply path 2). By setting the first bypass 95a and the second bypass 95b in a half-open state, the flow rates of pressurized air in the pattern air supply path 3 and the atomization air supply path 2 are made equal.

Further, the valve member 92 is in the position shown in FIG. The flow of pressurized air to path 2 and pattern air supply path 3 is cut off.

The device of the fourth embodiment having the above configuration has substantially the same effects as those of each of the embodiments described above.

Next, as shown in FIGS. 25 to 27, the paint spraying device A5 of the fifth embodiment is configured to connect the atomizing air supply path 2 and the pattern air inside the main body g5 of the electrostatic spray gun G5. The supply path 3 is communicated with the compressor Cf through one air supply path 90, and a flow rate control device 5 consisting of a low-return valve 5 as a fixed throttle is disposed in the air supply path 90. is different from each of the above-mentioned embodiments.

Further, the atomizing air supply path 2 is provided with a downstream constriction section 80 of the flow rate control device 5.

Furthermore, to explain the device A5 of the fifth embodiment in detail, as shown in FIGS. A cylindrical adjustment valve 102 for atomization and patterning is arranged in an airtight manner to make it more operable.

The regulating valve 102 has a cross-shaped cross section and has flow paths 103 and 104 for atomization and patterning independently bored therein.

This adjustment valve 102 is rotatable about its axis and fitted in an airtight manner into a bottomed cylindrical cylinder 105 bored in the main body g5.

As shown in FIG. 27, the inner cavity of this cylinder 105 has openings 103a and 104a communicating with the atomizing air supply path and the patterning air supply path 3, respectively, and the air supply path 2.
Elongated holes 106a communicating with 3 are formed facing each other.

The flow paths 103 and 104 in the regulating valve 102 are radial branch paths 103 b , 103 c , 1 , respectively.
03 d + 103 e and 104b, 104c
, 104d, and 104e.

Among these, branch roads 103b and 104e are branch roads 10
The flow path area is smaller than that of 3e and 104b.

Also, branch roads 103e and 104e. 103d, 104
d has the same flow path area.

A long hole 106b is bored outside the branch passages 103d and 104d as a flow passage for pressurized air.

Further, a rotation shaft 1 of the adjustment valve 102 is provided at one end of the adjustment valve 102.
07 is integrally connected with a lever 108 which can be operated from the outside.

By rotating this lever 108 by a predetermined amount, the branch paths 103b to 103e or 104b to 104
The opening and closing of communication with the air supply paths 2 and 3 for each atomization pattern in the eG column and the supply path 90 can be adjusted variably.

Thereby, the present device A5 can independently control the flow rate of pressurized air from the air supply path 90 to the atomizing air supply path 2 and the patterning air supply path 3.

That is, in the position shown in FIG. 26, the regulating valve 102 communicates with the atomizing air supply path 2 through the branch path 103b, the pattern air supply path 3 through the branch path 104b, and the other branch paths 103e and 104e. , 103c
, 104c are closed, the flow rate of pressurized air in the pattern air supply path 3 is made smaller than that in the atomization air supply path 2.

Further, the adjustment valve 102 allows the flow rate of the pressurized air in the atomizing air supply path 2 to be adjusted to the pattern air supply by connecting the branch path 103c and the pattern air supply path 104c to the atomizing air supply path 2. Compared to Route 3, it is considered to be a dog.

Furthermore, the adjustment valve 102 has a branch path 103e in the atomizing air supply path 2 and a branch path 103e in the pattern air supply path 3.
04e are in communication with each other, the pressure air flow rates of the pattern air supply path 3 and the atomization air supply path 2 are made equal.

Further, the adjustment valve 102 has a wall portion between the branch passages, and each opening 1 of the pattern air supply passage 3 and the atomization air supply passage 2.
03a and 104a (this is to cut off the flow of pressurized air from the air supply path 90 to the atomizing air supply path 2 and pattern air supply path 3).

In the apparatus A5 of the fifth embodiment, reference numeral 109 denotes an electrode that charges the paint and is electrically connected to the power source E through a cable 110.

The apparatus A5 of the fifth embodiment having the above configuration has substantially the same effects as those of each of the embodiments described above.

Next, the paint injection device A6 of the sixth embodiment branches the atomizing air supply path 2 and the pattern air supply path 3 from the air supply path 70a to the compressor C (as shown in FIG. 28A). This embodiment differs from the previous embodiments in that a pressure reducing valve V5a serving as a pressure control device is disposed in the atomizing air supply path 2 which communicates via a path 70b and is downstream from the branch path 70b.

From this, the device A6 of the sixth embodiment has a pressure reducing valve V6a.
With this arrangement, the flow rate of pressurized air in the pattern air supply path 3 (hereinafter referred to as the pattern air supply path 3) can be made larger than the same amount as in the atomization air supply path 2. It has an effect.

In the sixth embodiment, the pressure reducing valve V6a may be installed inside the main body g6 of the spray gun G6, or outside in the atomizing air supply path 2 communicating with the compressor C.

The device A6 of this sixth embodiment is the pressure reducing valve V6a described above.
A flow control device as shown in Fig. 16 which controls the flow rate of pressurized air instead of a branch path? It may be installed in the atomizing air supply path 2 downstream of Ob, and substantially the same effect as described above can be achieved.

Next, as shown in FIG. 29, the paint spraying device A7 of the seventh embodiment connects the atomizing air supply path 2 and the patterning air supply path 3 to the compressor C (toward the compressor C) outside the main body g7 of the spray gun G7. This embodiment differs from the previous embodiments in that one air supply path 70 communicates through a branch path 70b, and a flow rate control device (7) consisting of the aforementioned rotary valve is disposed in the branch path 70b.

As a result, the device A7 of the seventh embodiment has a flow rate control device ■7.
(Thus, the flow rate of pressurized air in the atomizing air supply path 2 and the patterning air supply path 8 can be controlled separately, respectively, and substantially the same effect as in each of the above-described embodiments is achieved.

Next, as shown in FIG. 30, the paint injection device A8 of the eighth embodiment has a pressure regulator with a switch 200, 201 as a flow rate control device (8), an atomizing air supply path 2, and a pattern air supply path. It differs from the previous embodiments in that both paths 3 and 3 are equipped.

That is, branch channels 202 and 203 that can be adjusted by pressure regulators 200 and 201 are arranged in the atomizing air supply channel 2 and the patterning air supply channel 3, and the pressure combination includes, for example, an opening/closing channel 200a and a channel 201a. Trout in 2, channel 2
00b and 201b are 4kg72 Channel 200c201
c is 6X7. Adjust in advance to obtain the required pressure.

By controlling the opening and closing of the respective opening/closing passages by appropriately selecting and combining them, the necessary pressure can be supplied to the spray gun G8 of the apparatus A8 of the eighth embodiment.

Incidentally, in the device A8 of the eighth embodiment, when only the opening/closing passage 200a in the atomizing air supply passage 2 is opened and only the opening/closing passage 201b in the pattern air supply passage 3 is opened, the result shown in FIG. A coating pattern a shown in the figure was obtained.

This is connected to the opening/closing flow path 201 in the pattern air supply path 3.
By switching from b to 201b, the coating pattern b shown in Fig. 32 could be instantly achieved.

In addition, the combination of the device of the eighth embodiment and the reciprocator allows painting of objects of various shapes on a conveyor,
The finishing condition of complex-shaped articles painted by robots can be significantly improved.

It had excellent practical effects. Next, the paint spraying device A9 of the ninth embodiment is constructed as shown in FIG. The pattern air supply path 3 downstream from the branch path 70b communicates through the branch path 70b, and is provided with a pressure reducing valve (5b) as a pressure control device to achieve atomization compared to the pattern air supply path 3. The flow rate of pressurized air in the air supply path 2 can be increased to a level greater than or equal to the same amount, and substantially the same effects as those of the embodiments described above are achieved.

Note that the flow control device in each of the above embodiments (hereinafter referred to as "flow control device") is not limited to the one described above, but may also include a hydraulic valve or a four-port switching solenoid valve (9) as shown in FIG. 33. This embodiment provides substantially the same effects as those of the embodiment.

This solenoid valve v9 reciprocates the valve rod 60 in the axial direction by energizing and demagnetizing the solenoid, and operates each of the first to fourth sets 6.
1.62, 63, and 64 can be selected and positioned as appropriate.

The first set 61 cuts off the air supply paths 2 and 3 for atomization and patterning, and the second set 62 short-circuits the air supply paths 2 and 3 for atomization and patterning. The air flow rates in the air supply paths 2 and 3 are made equal.

Further, the third set 63 has a flow rate of pressurized air in the pattern air supply path 3 that is higher than that in the atomization air supply path 2, and the fourth set 64 is different from the third set 63. There are some that have the opposite air flow rate.

In addition, in each of the above embodiments, the spray gun is applicable not only to liquid paint spraying or electrostatic coating, but also to powder coating spraying equipment for powder coating, and even to handheld type installation types. It is possible to implement the method and achieve substantially the same effects as those described above.

Furthermore, in each of the above embodiments, the atomizing air supply path and the patterning air supply path may each communicate with one pressure air supply source, or may each independently communicate with a dedicated pressure air supply source, Almost the same effects as described above can be achieved.

As explained above, the paint spraying device of the present invention is capable of spraying paint that is communicated with a pressure air supply source and is supplied from the opening of the paint supply passage, and mixes the paint and air by expanding the pressure air and sprays the mixture. A pressurized air supply path for controlling the mixed flow communicates with the pressurized air supply source and controls the injection shape of the mixed flow of paint and air using the pressure air, thereby making it possible to vary the shape of the coating applied to the object to be coated. In addition, the pressure or flow rate of the pressurized air in the paint injection pressurized air supply path and the mixed flow control pressurized air supply path are controlled respectively, thereby controlling the mixing state of the paint and air and the mixed flow. Accurately and reproducibly control the injection shape over a wide range1
In addition to this, it also brings practical effects such as the ability to arbitrarily change the spray shape and mixing state while performing smooth coating to increase coating accuracy and improve quality. It is something.

[Brief explanation of the drawing]

Figures 1 to 3 show conventional devices, respectively.
Figure 1 is a schematic diagram of the conventional device, Figures 2 and 3 are trend diagrams showing the relationship between the opening amount of the regulating valve, air flow rate and coating weight, respectively, and Figures 4 to 12 are diagrams of the present invention. 4 shows a schematic diagram of the device according to the first embodiment, FIG. Figure 7 is a partially enlarged sectional view of the same, Figure 8 is a trend diagram showing the relationship between air pressure and air flow rate, and Figures 9 and 10 are trends showing the relationship between pattern air and coating film weight. Diagram, Figure 11 and 1
2 is a schematic diagram showing the object to be coated and the pattern shape by the apparatus of the first embodiment, and FIGS. 13 to 16 are schematic diagrams or sectional views respectively showing the apparatus of the second embodiment of the present invention.
17 to 19 are schematic diagrams respectively showing a third embodiment of the present invention, FIGS. 20 to 24 are schematic diagrams respectively showing a fourth embodiment of the present invention, and FIGS. 25 to 27 are schematic diagrams respectively showing a fourth embodiment of the present invention. 28A is a schematic diagram showing a sixth embodiment of the present invention, FIG. 29 is a schematic diagram showing a seventh embodiment of the present invention, 30th
32 are schematic diagrams and trend diagrams thereof showing an apparatus according to an eighth embodiment of the present invention, FIG. 28B is a schematic diagram showing an apparatus according to a ninth embodiment of the present invention, and FIG. 33 is a control device. It is a schematic diagram showing a modification of . In the figure, C...Compressor, T...Paint supply source, ■...Pressure or flow rate control device,
G...Strip 1/- gun, 2...Air supply path for atomization, 3...Air supply path for pattern.

Claims (1)

[Scope of Claims] 1. A paint supply passage communicating with a paint supply source and supplying paint; and a paint supply passage communicating with a pressurized air supply source and supplying paint from an opening of the paint supply passage through the expansion of pressurized air (through which the paint and air are separated). A pressurized air supply path for spraying paint that is mixed and sprayed, and a pressurized air supply path that communicates with a pressurized air supply source to control the spray shape of the mixed flow of paint and air, thereby making it possible to vary the shape of the coating applied to the object to be coated. A paint injection device having a pressure air supply path for controlling a mixed flow, wherein the pressure air supply path for paint injection and the pressure air supply path for controlling a mixed flow each include a control device that controls the pressure or flow rate of the pressurized air. A paint injection device characterized in that the pressure or flow rate of pressurized air in the paint injection pressurized air supply path and the mixed flow control pressure air supply path are each independently controlled. 2. Paint supply A paint supply passage that communicates with the source (a paint supply passage that supplies paint) and a paint injection pressure that communicates with a pressurized air supply source and sprays the paint supplied from the opening of the paint supply passage by expanding the pressurized air and mixing the paint and air. An air supply path and a pressurized air supply for the mixed flow side which communicates with the pressurized air supply source and controls the injection shape of the mixed flow of paint and air by using the pressure air, thereby making the shape of the coating applied to the object to be coated variable. A paint injection device having a pressure air supply path for paint injection and a pressure air supply path for controlling mixed flow communicate with the pressure air supply source via a branch path from a common pressure air supply path, A control device is provided to control the pressure or flow rate of each pressurized air to be distributed to the branch passages, and the pressure or flow rate of the pressurized air in the paint injection pressurized air supply passage and the mixed flow side (goods) pressurized air supply passage is provided. A paint injection device characterized in that the flow rates are independently controlled. 3. A paint supply source (a paint supply passage that communicates with the paint supply passage, and a pressurized air supply source Q that communicates with the paint supply passage). A pressurized air supply path for paint injection, which mixes the paint supplied from the opening with the air by expanding the pressurized air, and injects the mixture; and a pressure air supply path communicating with a pressure air supply source to control the injection shape of the mixed flow of the paint and air using the pressurized air. A paint injection device having a positive pressure air supply for controlling the mixed flow and controlling the shape of the coating applied to the object to be coated. Each pressurized air supply path is provided with a control device for controlling the pressure or flow rate of the pressurized air, and the common pressure air supply path communicates with the pressure air supply source via a branch path to control the pressure or flow rate of the pressurized air for spraying the paint. A paint injection device characterized in that the pressure or flow rate of pressurized air in a supply path and a pressure air supply path for mixed flow control 1 is independently controlled. 4 A paint supply passage that communicates with a paint supply source and supplies paint, and a pressurized air supply source (which communicates with the paint supply source and expands the paint supplied from the opening of the paint supply passage (through which the paint and air are mixed and sprayed) Pressurized air for controlling a mixed flow, which communicates with a pressure air supply path for paint injection and a pressure air supply source, and controls the jet shape of the mixed flow of paint and air using the pressure air, thereby changing the shape of the coating applied to the object to be coated. The pressure air supply path for the paint injection pressurized air supply path and the mixed flow side has a branch path from the common pressure air supply path for the pressure air supply source Q. A control device for controlling the LL force or flow rate of pressurized air is provided in the paint injection pressurized air supply path which is downstream from the branch path and communicates with the paint injection pressurized air supply path and the mixed flow control pressure air supply. A paint injection device characterized in that the pressure or flow rate of the pressurized air in the passage is controlled respectively. a pressurized air supply path for paint injection, which mixes and injects the paint supplied from the opening of the paint supply path by expanding pressurized air; and a pressurized air supply path for paint injection, which is connected to a pressure air supply source and mixes the paint and air by the pressurized air. A paint injection device having a pressure air supply path for controlling a mixed flow, which controls the shape of the sprayed flow to vary the shape of the coating applied to the object to be coated. The pressure air supply path for flow control communicates with the pressure air supply source via a branch path from the common pressure air supply path, and supplies the pressure of the pressurized air to the pressure air supply path for mixture control downstream from the branch path. What is claimed is: 1. A paint injection device, comprising a control device for controlling the pressure air in the paint injection pressure air supply path and the mixed flow control pressure air supply path, respectively.