JP3205505B2 - Rotary atomizing head type coating machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary atomizing head type coating machine suitable for coating an object such as an automobile body.

[0002]

2. Description of the Related Art In general, a rotary atomizing head type coating machine is widely used as a coating machine for coating an object to be coated such as an automobile body. The formed coating machine main body, an air motor provided in the coating machine main body, a rotating shaft that is inserted in the axial direction of the air motor, and is rotated by the air motor, and located at a tip side of the coating machine main body. A rotary atomizing head which is attached to the rotating shaft and whose outer periphery on the leading end side is a paint discharge edge is substantially constituted.

[0003] In the rotary atomizing head type coating machine constructed as described above, the rotary atomizing head is rotated at a high speed by an air motor, and in this state, the paint is supplied to the rotary atomizing head. The paint is atomized by the centrifugal force generated when the head rotates, and the paint particles are caused to fly along an electrostatic field between the paint and the object to be applied to the object.

[0004]

By the way, in the above-mentioned rotary atomizing head type coating machine according to the prior art, the rotary atomizing head is driven at, for example, 20,000 to 40,000 rpm by an air motor.
, And the paint is atomized by the centrifugal force of this rotation. When the rotary atomization head rotates at high speed in this manner, air on the back side of the rotary atomization head is blown in the centrifugal direction, and a negative pressure area is generated on the back side of the rotary atomization head.

On the other hand, in a rotary atomizing head type coating machine, in order to apply the paint particles discharged from the rotary atomizing head to an object to be coated in a desired spray pattern, the rotary atomizing head is applied from behind the rotary atomizing head. The shaping air is blown out toward the outer circumference of the head, and the air on the back side of the rotary atomizing head is pulled toward the outer circumferential side by this shaping air, which also causes the air on the back side of the rotary atomizing head A negative pressure area occurs.

[0006] At this time, the paint particles atomized by the rotary atomizing head are pulled toward the negative pressure area by the air flow due to the air pumping action, and wrap around to the back side of the rotary atomizing head. Adheres to the back side of the machine or the coating machine itself. As a result, not only the rotary atomizing head and the coating machine main body become dirty, but also the paint adhering to the back side of the rotary atomizing head and the coating machine main body during coating peels off and adheres to the coating surface of the object to be coated, resulting in poor coating. This may cause a problem that reliability may be reduced.

The present invention has been made in view of the above-described problems of the prior art, and supplies supplement air to a negative pressure area on the back side of the rotary atomizing head to supply the supplementary air to the rear side of the rotary atomizing head. It is an object of the present invention to provide a rotary atomizing head type coating machine capable of preventing adhesion of paint.

[0008]

In order to solve the above-mentioned problems, a rotary atomizing head type coating machine according to the first aspect of the present invention comprises a cylindrical coating machine main body and a coating machine main body. An air motor provided, a rotary shaft inserted in the axial direction of the air motor and rotated by the air motor, and a rotary shaft positioned at the tip end of the coating machine main body and attached to the rotary shaft; It consists of a rotary atomizing head that has become an edge.

The first aspect of the present invention is characterized in that the inside of the main body of the coating machine is provided with supplementary air from a source of compressed air.
And the exhaust air from the air motor
An exhaust air passage through which air flows is provided, and at the tip side of the coating machine main body, a negative pressure area generated on the back side of the rotary atomizing head when the rotary atomizing head is rotated by the air motor. From the replenishment air passage and the exhaust air passage
That is, a supplementary air ejection port for ejecting supplementary air that combines the above air is provided.

[0010] With this configuration, the paint is supplied to the rotary atomizing head while the rotary atomizing head is being rotated by the air motor via the rotary shaft, whereby the paint is supplied to the rotary atomizing head. At the paint discharge edge, and the paint particles can be applied by flying toward the object to be coated. Further, during the coating, the air from toward the negative pressure area generated in the rear side of the rotary atomizing head from the replenishing air ejection port and replenishment air passage and the exhaust air passage converging
Since the supplied replenishing air is ejected, the paint atomized at the paint discharge edge can be prevented from being pulled toward the negative pressure area, and the paint can be prevented from flowing around the back side of the rotary atomizing head. In addition, a source of compressed air supplied through the supplemental air passage
Air supplied through the replenishment air and exhaust air passage
Negative from the replenishment air outlet using exhaust air from the
Can be blown toward the pressure area,
To make effective use of
The flow rate of the supplementary air can be reduced.

According to a second aspect of the present invention, the supplementary air passage and the pressure
Between the air supply and the supplementary air flowing through the supplementary air passage.
There is provided a flow control means for controlling the flow. this
The flow rate of supplementary air by the flow rate control means
It can be controlled according to the situation of rear negative pressure, for example
Prevent turbulence in shaping air etc.
While maintaining the finished state well,
The paint can be prevented from wrapping around.

The invention according to claim 3 is characterized in that the inside of the coating machine body is
Is a supplementary air passage through which supplementary air from the compressed air source flows,
Exhaust air from the air motor is exhausted outside the coating machine body.
Exhaust air passages are provided independently of each other,
On the tip side of the main body, the rotary atomizing head is connected to the air motor.
Therefore, it is generated on the back side of the rotary atomizing head when rotated
Supplementary air supplied from the supplementary air passage toward the negative pressure area
A replenishment air spout is provided for spouting only air
The air flows between the air passage and the compressed air source through the supplementary air passage.
With flow control means for controlling the flow rate of supplementary air
And that

With this configuration, the flow rate can be controlled.
The flow rate of supplementary air by means of negative pressure in the negative pressure area
And replenishment air separately from the exhaust air.
Can be supplied. Thereby, in the present invention,
Removes exhaust air from the refill air and
Supply only charged air from the replenishment air jet to the negative pressure area
Can be more reliably shaped by refill air
Negative pressure area becomes supplementary air without affecting air, etc.
Therefore, it can be extinguished.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a rotary atomizing head type coating machine according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, FIGS. 1 to 3 show a first embodiment of the present invention.

In the drawing, reference numeral 1 denotes a coating machine main body forming the outer shape of a rotary atomizing head type coating machine. The coating machine main body 1 has a housing 2 formed in a bottomed cylindrical shape and an outer periphery of the housing 2. A cover 3 formed in a tubular shape by, for example, an insulating resin material so as to cover; and a cover 3 formed by, for example, an insulating resin material,
A shaping air ring 4 attached to the tip side of the cover 3 is roughly constituted. The inside of the housing 2 is a motor housing 2A for housing an air motor 6 to be described later, and a fixing ring 5 for fixing the air motor 6 in the motor housing 2A is screwed on the open end side of the motor housing 2A. Is being worn.

Here, the shaping air ring 4 has a bottomed stepped cylindrical shape, and a shaping air jet port 18 described later is formed on the tip end surface 4A. The inside of the tip end surface 4A is a rotary atomizing head 12. Is formed as a housing recess 4B. A rotating shaft 11 protrudes from the center of rotation of the shaping air ring 4.
Is open.

Reference numeral 6 denotes an air motor accommodated in a motor accommodating portion 2A of the housing 2. The air motor 6 has a shaft insertion hole 7A extending in the axial direction and a base end side of the shaft insertion hole 7A whose diameter is enlarged. A stepped cylindrical motor housing 7 having a formed turbine chamber 7B, and an air turbine 8 rotatably housed in the turbine chamber 7B of the motor housing 7
And the rotary shaft 11 is fitted to the inner peripheral surface of the shaft insertion hole 7A.
Radial air bearings 9, 9 that support the rotor so that it can rotate at high speed
Is fitted in the turbine chamber 7B so as to face in the axial direction,
A thrust-side air bearing 10 for supporting the air turbine 8 so as to be able to rotate at a high speed is roughly constituted. A base end of a rotating shaft 11 is fitted on the inner peripheral side of the air turbine 8.

Reference numeral 11 denotes a shaft insertion hole 7A of the motor housing 7.
The rotary shaft 11 is supported by each air bearing 9 so as to be rotatable at a high speed, and a feed tube 15 described later is axially inserted through an inner peripheral side of the hollow rotary shaft.
The proximal end of the rotating shaft 11 is fitted to the air turbine 8, and the distal end protrudes outside the motor housing 7.

Reference numeral 12 denotes a bell-shaped rotary atomizing head attached to the tip end of the rotating shaft 11, and the rotary atomizing head 12 has a morning glory-shaped atomizing head body 13 expanding toward the tip end. A hub member 14 fitted on the inner periphery of the front side of the atomizing head main body 13, and the base end of the atomizing head main body 13 has a rotating shaft 1.
1, a front surface side is a paint smoothing surface 13B, and an outer periphery of the paint smoothing surface 13B is a paint discharge edge 13C that atomizes and discharges the smoothed paint.
It has become. A conical back surface 13D extends from the mounting portion 13A to the paint discharge edge 13C.

Further, the hub member 14 is formed in a closed cylindrical shape with a front side closed, and has an outer peripheral side for guiding paint or thinner discharged from the feed tube 15 to the paint smoothing surface 13B. 1 hub hole 14A, 1
, And a plurality of second hub holes 14B, 14B,... (Two shown each) are provided at the center side for supplying thinner to the front surface.

Reference numeral 15 denotes a feed tube which is inserted into the rotary shaft 11 and discharges paint or thinner toward the hub member 14. The feed tube 15 has a base end projecting from the rotary shaft 11 and a motor housing of the air motor 6. 7
The tip side extends in the axial direction, protrudes from the rotating shaft 11, and extends into the rotary atomizing head 12.

Reference numeral 16 denotes a paint valve provided on the base end side of the feed tube 15. The paint valve 16 controls the supply of paint to the feed tube 15, and is provided with a paint source via a paint pipe, a gear pump and the like. (Neither is shown).

Reference numeral 17 denotes a shaping air supply passage provided on the outer peripheral side of the coating machine main body 1. The shaping air supply passage 17 is formed on the outer peripheral side of the housing 2 at the base end side of the coating machine main body 1. Shaped air passage 17A
And an annular passage 17B communicated with the shaping air passage 17A and defined by the housing 2, the cover 3, the shaping air ring 4, and the fixing ring 5, and a plurality of extending from the annular passage 17B toward the distal end. Access passage 1
7C, 17C,... (Only two are shown) and the respective communication passages 1
Annularly formed chamber chamber 1 located at the tip side of 7C
7D.

Reference numerals 18, 18,... Denote a plurality of shaping air outlets provided at the distal end surface 4A of the shaping air ring 4.
Are connected to the chamber 17D of the shaping air supply passage 17 and are arranged continuously in the circumferential direction so as to surround the rotary atomizing head 12, as shown in FIG. Then, each shaping air ejection port 18 ejects air supplied through the shaping air passage 17A of the shaping air supply path 17 toward the paint discharge edge 13C of the atomizing head main body 13 as shaping air. By rotating atomization head 1
2 is for shaping the spray pattern of the paint flying toward the object to be coated.

Reference numeral 19 denotes the housing 2 and the motor housing 7
The bearing air supply path 19 supplies air to the air bearings 9 and 10. Reference numeral 20 denotes a turbine air supply passage provided between the housing 2 and the motor housing 7. The turbine air supply passage 20 communicates with a turbine chamber 7B of the motor housing 7, and air inside the turbine chamber 7B is provided. The drive air is supplied to the turbine 8.

.. Indicate exhaust air passages (only two are shown) provided on the outer peripheral side of the distal end of the motor housing 7, and the exhaust air passages 21 correspond to the air turbine 8 and the air bearings 9, 10, respectively. The upstream side communicates with the turbine chamber 7B and the like, and the downstream side communicates with a chamber chamber 22D described later.

Reference numeral 22 denotes a supplementary air supply passage provided on the outer peripheral side of the coating machine main body 1. The supplementary air supply passage 22 includes a supplementary air passage 22A formed on the outer peripheral side of the housing 2.
An annular passage 22B defined by the housing 2, the fixed ring 5, and the motor housing 7 in communication with the supplementary air passage 22A; and a plurality of annular passages extending inward from the annular passage 22B toward the distal end. Communication passage 22C, 2
2C,... (Only two are shown), and an annular chamber chamber 22D which is located at the tip side of each communication passage 22C and is defined by the shaping air ring 4, the fixing ring 5, and the motor housing 7. Each exhaust air passage 21 communicates with the chamber chamber 22D, and the replenishment air and the exhaust air from the air motor 6 merge in the chamber chamber 22D.

Reference numerals 23, 23,... Denote a plurality of replenishing air outlets provided at the bottom surface 4C of the shaping air ring 4. Each of the replenishing air outlets 23 is a chamber of the replenishing air supply passage 22. 22D, as shown in FIG.
Eight, for example, are arranged in the circumferential direction so as to surround the mounting portion 13A of the atomization head main body 13. And each replenishment air jet 2
Numeral 3 is to blow out air supplied through the supplementary air passage 22A or the like of the supplementary air supply passage 22 toward the back surface 13D side of the atomizing head main body 13 as supplementary air.

Reference numeral 24 denotes an air pipe connected to the supplement air path 22A of the supplement air supply path 22, and the air pipe 24 is connected to a pressure source 25 such as a compressor.

Numeral 26 designates a flow rate control section provided as a flow rate control means provided in the middle of the air pipe 24.
Is a flow control valve 27 provided in the middle of the air pipe 24.
And a control unit 29 connected to the flow regulating valve 27 via a lead wire 28. Then, the flow rate control unit 26 controls the control unit 29 from the control unit 29 while considering the characteristics of the spray paint, the number of rotations of the rotary atomizing head 12, the state of the shaping air being ejected from the shaping air supply path 17, and the like. By controlling the flow control valve 27 based on the signal, the replenishment air supplied from the compressed air source 25 to the replenishment air passage 22 is adjusted to an optimum flow rate according to the state of the negative pressure in the negative pressure area B. .

The rotary atomizing head type coating machine according to the present embodiment has the above-described configuration. Next, the operation thereof will be described.

First, when painting is performed on an object such as a vehicle body, driving air is supplied from the turbine air supply passage 20 to the turbine chamber 7B of the motor housing 7, and the air turbine 8 in the turbine chamber 7B is supplied. Drive rotationally. This allows
The rotary atomizing head 12 rotates together with the rotary shaft 11 fitted to the air turbine 8. At this time, air is supplied from the bearing air supply passage 19 to each of the air bearings 9 and 10, and the air turbine 8 and the rotating shaft 11 are supplied by the air bearings 9 and 10.
Is supported so that it can rotate at high speed.

Next, when the rotary atomizing head 12 is rotated as described above, the paint valve 16 is opened, and paint supplied from a paint source via a gear pump, a paint pipe or the like is fed from the tip of the feed tube 15. Discharge toward the rotary atomizing head 12.
As a result, the paint discharged to the rotary atomizing head 12 moves from each first hub hole 14A of the hub member 14 to the paint smoothing surface 13B of the atomizing head body 13 by centrifugal force, and the paint discharge edge 13C And are atomized into paint particles. The paint particles discharged from the rotary atomizing head 12 are shaped into a desired spray pattern by shaping air ejected from each shaping air jet port 18 via a shaping air supply path 17 and, for example, an external electrode (FIG. (Not shown), and fly and apply along an electrostatic field formed toward an object to be ground at an earth potential.

Here, when the rotary atomizing head 12 rotates at a high speed, as shown in FIG. 3, the air on the back surface 13D side of the atomizing head body 13 is blown in the direction of arrow A by the centrifugal force, and the back surface 13D For example, a negative pressure area B is generated in the accommodation recess 4B of the shaping air ring 4 as shown by a two-dot chain line in FIG.

On the other hand, when the shaping air is jetted from each shaping air jet port 18 toward the rotary atomizing head 12,
The air on the back 13D side is indicated by arrow A due to shaping air.
Therefore, a negative pressure area B is generated in the accommodation recess 4B of the shaping air ring 4 on the back surface 13D side by the shaping air.

However, in this embodiment, at the time of this coating, the flow control valve 27 of the flow control unit 26 is opened, and the supplementary air from the compressed air source 25 is supplied through the air pipe 24 to the supplementary air supply path 2.
Supply to 2. As a result, the supplementary air from the compressed air source 25 is supplied to the supplementary air passage 22A of the supplementary air supply passage 22,
After being supplied to the chamber chamber 22D through the annular passage 22B and the communication passages 22C and being merged with the exhaust air from the exhaust air passages 21 in the chamber chamber 22D, the rotary atomizing head 12 The supplementary air is blown out in the direction of arrow C toward the negative pressure area B generated on the back surface 13D side of.

When the replenishment air is ejected from each replenishment air ejection port 23, the characteristics of the spray paint and the rotation
In consideration of the number of rotations of the rotary atomizer, the state of ejection of the shaping air from the shaping air supply path 17, and the like, a flow rate suitable for eliminating the negative pressure area B generated on the back surface 13D side of the rotary atomizing head 12, that is, the rotary mist The control unit 29 controls the flow regulating valve 27 so that supplementary air equivalent to the amount of air pulled in the direction of arrow A is ejected by the rotation of the head 12 and the shaping air.
It is possible to prevent the paint from flowing to the back surface 13D side of the rotary atomizing head 12 while maintaining the finished state of the coating by the rotary atomizing head type coating machine in a good state.

Thus, according to the present embodiment, the pressure source 25
The replenishing air is supplied to the replenishing air supply path 22 and the replenishing air is ejected from the respective replenishing air jet ports 23 to the rear face 13D side of the rotary atomizing head 12 so that the replenishing air flows toward the rear face 13D side of the rotary atomizing head 12 Since the replenishing air is replenished to the generated negative pressure area B and the paint can be prevented from being pulled to the negative pressure area B side, the paint can be prevented from flowing around to the back surface 13D side of the rotary atomizing head 12, and the mist can be prevented. The back 13D of the head 13
In addition, it is possible to reliably prevent the paint from adhering to the shaping air ring 4.

As a result, it is possible to prevent the paint from adhering to the rotary atomizing head 12 and the shaping air ring 4 and to contaminate them. Therefore, the frequency of cleaning these members can be reduced and the handling can be facilitated. As shown, the atomizing head body 13
The paint adhered to the back surface 13D or the like can be prevented from being peeled off and adhered to the coating surface of the object to be coated, the coating quality can be improved, and the reliability of the rotary atomizing head type coating machine can be improved.

The exhaust air from the air motor 6 is joined to the exhaust gas from the air turbine 8 and the air bearings 9 and 10 through the exhaust air passages 21 in the chamber 22D as a part of the supplementary air. Since it can be effectively used, the flow rate of the supplementary air supplied from the compressed air source 25 can be reduced by the amount of the exhaust air. For example, when the supply amount of the supplementary air is reduced, The burden can be reduced. On the other hand, when the flow rate of the supplementary air is a normal flow rate, the ejection flow rate of the supplementary air can be increased by the amount of the exhaust air.

Further, since the replenishing air supplied from the compressed air source 25 is controlled to a desired flow rate by the flow rate control unit 26, the paint is pulled to the negative pressure area B by ejecting an appropriate amount of the replenishing air. In addition to this, it is possible to prevent the supplementary air from adversely affecting the finished state of the coating, and to maintain good coating quality.

FIG. 4 shows a second embodiment of the present invention. The feature of this embodiment is that the exhaust air from the air motor is discharged to the outside without being used as a part of the supplementary air, Only the supplementary air supplied from the nozzle is ejected from the supplementary air outlet toward the negative pressure area. In this embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the drawing, 31, 31,... Indicate a plurality of exhaust air passages (only two are shown) provided on the outer peripheral side of the motor housing 7 according to the present embodiment.
Is connected to an exhaust passage 33 described later via an annular passage 32 defined between the housing 2 and the motor housing 7.

An exhaust passage 33 has one end connected to the annular passage 32 and the other end extending toward the base end of the coating machine main body 1, and the other end of the exhaust passage 33 is open to the outside. The exhaust passage 33 exhausts air discharged from each exhaust air passage 31 via the annular passage 32 to the outside of the coating machine main body 1.

Reference numeral 34 denotes a supplementary air supply passage according to the present embodiment. The supplementary air supply passage 34 is substantially the same as the supplementary air supply passage 22 described in the first embodiment.
, A, an annular passage 34B, communication passages 34C, 34C,..., And a chamber chamber 34D. The chamber chamber 34D is provided with eight supplementary air ejection ports 35, 35,. However, according to the present embodiment, the supplementary air supply path 34
Are different from the supplementary air supply passage 22 according to the first embodiment in that they are provided independently of the exhaust air passages 31.

Thus, in the present embodiment having the above-mentioned structure, substantially the same operation and effect as those of the first embodiment can be obtained. By providing the air turbine 8 independently of the exhaust air passage 31, the air turbine 8 whose flow rate varies depending on the coating conditions
The exhaust air from the air is removed from the supplementary air,
Only the supplementary air whose flow rate has been adjusted is supplied from each supplementary air jet port 35 via the supplementary air supply path 34 to the rotary atomizing head 12.
Can be replenished to the back surface 13D side, and it is possible to more reliably prevent the shaping air or the like from being disturbed by the replenishment air, and to improve the coating quality.

In each of the above embodiments, the case where eight replenishing air jets 23 and 35 are provided has been described as an example.
The present invention is not limited to this. For example, seven or less or nine or more supplementary air jets may be provided, and can be set as appropriate according to the supplementary amount of supplementary air.

In each of the above embodiments, the rotary atomizing head 12 is used.
In the above example, the paint discharged from is charged to a high voltage by an external electrode, but instead of this, for example, a high voltage generator is built in the main body of the coating machine, and it is directly connected via a rotating shaft, a feed tube, etc. The paint may be electrically charged to a high voltage.

[0050]

As described above in detail, according to the first aspect of the present invention, the paint is supplied to the rotary atomizing head while the rotary atomizing head is being rotated via the rotary shaft by the air motor. Thus, the paint can be discharged as finely divided paint particles at the paint discharge edge of the rotary atomizing head, and the paint particles can be flown toward the object to be coated to be applied. At the time of this painting, air from the replenishment air passage and the exhaust air passage
And supply air to the negative pressure area generated on the back side of the rotary atomizing head from the supply air outlet . Ri This is due to <br/>, prevents the paint is atomized paint releasing edges is pulled to a negative pressure area side, preventing the wraparound of the coating material to the back side of the rotary atomizing head It can prevent paint from adhering to the main body of the coating machine and the rotary atomizing head and become dirty, reduce the frequency of cleaning these components and facilitate handling, and, as described in the prior art, It is possible to prevent the paint adhered to the atomizing head or the like from peeling off and adhering to the coating surface of the object to be coated, improve the coating quality, and improve the reliability of the rotary atomizing head type coating machine. In addition, the refill air passage
Air and exhaust air passages from a source of compressed air supplied via
With exhaust air from the air motor supplied via
From the refill air outlet toward the negative pressure area.
Effective use of exhaust air as supplementary air
And reduce the flow of make-up air from the air source.
When the supply amount of supplementary air is kept small.
Can reduce the load on the compressed air source. Meanwhile, replenishment
When the normal air flow rate is used, the exhaust air
Only the supply flow rate of the supplementary air can be increased.

According to the second aspect of the present invention, the flow rate control means
Therefore, the flow rate of the supplementary air flowing through the supplementary air passage is
A) It can be controlled according to the condition of negative pressure
Refill negative pressure area without affecting ping air, etc.
Can be extinguished by air, improving coating quality
Can be

According to the third aspect of the present invention, in the main body of the coating machine.
Is a supplementary air passage through which supplementary air from the compressed air source flows,
Exhaust air from the air motor is exhausted outside the coating machine body.
Separate exhaust air passages and
The supplementary air flowing through the supplementary air passage is provided between the charge air passage and the pressure source.
The system is provided with a flow control means for controlling the flow rate of air charge.
Therefore, the flow rate of the supplementary air can be controlled by the flow rate control means in accordance with the negative pressure in the negative pressure area , and the exhaust air
In addition, supplementary air can be supplied separately. This
Therefore, in the present invention, the exhaust air is removed from
Only the replenished air whose volume has been adjusted is
Refill air can be supplied to the rear more reliably
Thus, the negative pressure area can be eliminated by the supplementary air without affecting shaping air and the like, and the coating quality can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a rotary atomizing head type coating machine according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view taken from the direction of arrows II-II in FIG.

FIG. 3 is an enlarged cross-sectional view of a main part of FIG. 1 showing a state in which supplementary air is being ejected from each supplementary air ejection port to a negative pressure area.

FIG. 4 is a sectional view showing a rotary atomizing head type coating machine according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coating machine main body 6 Air motor 11 Rotary shaft 12 Rotary atomizing head 21 Exhaust air passage 22, 34 Supplementary air supply passage 22A, 34A Supplementary air passage 23, 35 Supplementary air ejection port 25 Compressed air source 26 Flow control unit (flow control means) B Negative pressure area

Claims (3)

(57) [Claims] 1. A coating machine main body formed in a cylindrical shape, an air motor provided in the coating machine main body, a rotating shaft inserted in an axial direction of the air motor and rotated by the air motor, A rotary atomizing head type coating machine comprising a rotary atomizing head, which is attached to the rotating shaft and located on the distal end side of the main body and whose outer periphery on the distal end side is a paint discharge edge, in the coating machine main body, A replenishing air passage through which replenishing air from the compressed air source flows and an exhaust air passage through which exhaust air from the air motor flows are provided. On the tip side of the coating machine main body, the rotary atomizing head is rotated by the air motor. A replenishing air jet port for spouting replenishing air that combines air from the replenishing air passage and the exhaust air passage toward a negative pressure area generated on the rear side of the rotary atomizing head when the replenishing is performed. Features Rotary atomizing head type coating machine that. 2. The apparatus according to claim 1, further comprising :
A flow for controlling the flow rate of the supplementary air flowing through the supplementary air passage
2. The rotary atomizing head type coating machine according to claim 1, further comprising an amount control means . 3. A coating machine main body formed in a tubular shape, and said coating machine.
An air motor provided in the machine body and a shaft of the air motor
Direction, and rotated by the air motor.
A rotating shaft, and
Attached to the shaft, and the outer periphery on the tip side becomes the paint discharge edge.
In a rotary atomizing head type coating machine comprising a spray atomizing head , supplementary air from a pressurized air source flows in the coating machine body.
Supply air to the replenishment air passage and exhaust air from the air motor.
The exhaust air passage for exhausting to the outside of the
The rotary atomizing head is provided at the tip side of the coating machine main body.
The back of the rotary atomizing head when rotated by an amoter
From the supplementary air passage toward the negative pressure area
A replenishment air spout that blows out only the supplied replenishment air
Only the between the replenishment air passage and gas sources, rotary atomizing, characterized in that the flow control means for controlling the flow rate of replenishment air flowing through the replenishment air passage and set <br/> only that structure Head type coating machine.