JP3178654B2 - Rotary atomizing head type coating equipment - 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 apparatus suitable for applying an object to be coated while performing color change.

[0002]

2. Description of the Related Art In general, a coating apparatus using a rotary atomizing head includes an air motor provided in a cover, a rotary shaft inserted in the axial direction of the air motor and rotated by the air motor, and mounted on the rotary shaft. A rotary atomizing head that rotates at a high speed by the rotary shaft, and a feed tube that is disposed extending in the axial direction in the rotary shaft and that discharges paint or a solvent from a tip extending into the rotary atomizing head. It is roughly composed of The feed tube is formed in a double cylindrical shape from an inner cylinder having a paint supply passage therein and an outer cylinder having a solvent supply passage between the inner tube and the paint supply passage. The solvent supply path is connected to a thinner source via, for example, a thinner pipe or the like.

[0003] The rotary atomizing head is provided on a bell cup formed in a bell shape or a cup shape, and is provided on an inner peripheral side of the bell cup, and is provided between the bell tube and the feed tube. A hub member that defines a paint reservoir for retaining the discharged paint, and a paint or thinner that is provided on an outer peripheral side of the hub member and that is discharged from the feed tube and flows out of the paint reservoir to a discharge edge of a bell cup. A plurality of paint outlet holes, provided in the center of the hub member,
And a plurality of solvent outlet holes for allowing the thinner discharged from the feed tube to flow out of the paint reservoir to the front surface of the hub member.

[0004] The feed tube is connected to a color changing valve device for supplying paint, air, thinner and the like via a paint pipe. Further, the coating device is connected to a high voltage generator, a negative high voltage is applied, and electrostatic coating is performed.

[0005] When the coating is performed by the rotary atomizing head type coating apparatus according to the prior art configured as described above, first, compressed air is supplied to an air motor to rotate the rotary atomizing head together with the rotary shaft at high speed. Then, the paint is discharged from the paint supply passage of the feed tube toward the paint pool in the rotary atomizing head. As a result, the paint flows along the inner peripheral surface of the bell cup, and after being formed into a thin film, is discharged as charged paint particles from the discharge edge on the front end side. At this time, since an electrostatic field is formed between the coating device and the object to be coated, the charged paint particles emitted from the discharge edge of the rotary atomizing head are applied to the object along the lines of electric force. And apply to the object.

When the paint is changed to the next color paint, an air thinner is supplied from the color changing valve device into the rotary atomizing head, so that the air thinner adheres to the liquid contact surface of the rotary atomizing head. Wash the pre-color paint. Thereafter, the next color paint is supplied to the paint supply path to prepare for the next painting operation.

However, during the supply of the next color paint, the next color paint may adhere to the front surface of the hub member of the rotary atomizing head, the outer peripheral surface of the bell cup, and the like. Also, when the painting operation is temporarily stopped due to a trouble in the painting line, a break during the lunch break, or the like, the paint adhered to the rotary atomizing head may be solidified. Further, when the same color paint is applied continuously for a long time, the paint may adhere to the rotary atomizing head and may be similarly deposited.

In such a case, the paint adhering to the rotary atomizing head is solidified and peels off at the time of coating to cause poor coating, so that the paint adhering to the liquid contact surface of the rotary atomizing head is washed. There is a need.

In order to clean the paint adhered to the rotary atomizing head, the rotation shaft and the rotary atomizing head are rotated by the air motor, and the inside of the paint reservoir of the rotary atomizing head is moved from the feed tube to the rear surface of the hub member. Dispense thinner toward. As a result, a part of the thinner is supplied from the paint reservoir through the paint outlet holes to the discharge edge and the like, and cleans the paint adhered to the discharge edge and the like. Some of the thinners are supplied to the front surface of the hub member through the solvent outflow holes, and wash the paint adhered to the front surface of the hub member.

[0010]

By the way, according to the above-mentioned prior art, when cleaning the rotary atomizing head,
From the tip of the feed tube, thinner is discharged from the paint reservoir of the rotary atomization head toward the rear surface of the hub member,
Most of the thinner discharged from the feed tube flows into the solvent outlet. For this reason, thinner cannot be actively supplied to each paint outlet hole to which a large amount of paint adheres, the discharge edge of the bell cup, etc., which is a paint distribution channel.
As a result, it takes time to wash the paint adhered to each paint outlet hole, the discharge edge of the bell cup, and the like, and there is a problem that productivity is reduced.

On the other hand, at the time of painting, a part of the paint sprayed from the rotary atomizing head is affected by the air pumping phenomenon due to the high speed rotation of the rotary atomizing head and the shaping air for forming the spray pattern. There is a case where the water flows backward so as to go backward and adheres to the outer peripheral surface of the bell cup.

In order to solve this problem, a coating apparatus according to another prior art is disclosed in, for example, Japanese Utility Model Laid-Open No. 57-62.
No. 659 is disclosed. The coating apparatus includes a cleaning nozzle that discharges thinner toward the outer peripheral surface of the bell cup, and discharges the thinner from the cleaning nozzle toward the outer peripheral surface of the bell cup, so that the paint adheres to the outer peripheral surface of the bell cup. Can be washed.

However, in the above-mentioned other prior art coating apparatus, the thinner is only discharged from the cleaning nozzle toward the outer peripheral surface of the bell cup. For this reason, there is a problem that the thinner rebounds on the outer peripheral surface of the bell cup and does not adapt to the outer peripheral surface of the bell cup, and the paint adhered to the outer peripheral surface of the bell cup may not be reliably washed.

Further, in order to eliminate the bounce of the thinner and the poor adaptation, it is necessary to precisely set the mounting position of the cleaning nozzle, the direction of the cleaning nozzle, the discharge amount of the thinner, etc. It is difficult and requires advanced design and manufacturing techniques.

Furthermore, it is inefficient to provide a dedicated nozzle separately for cleaning the outer peripheral surface of the bell cup,
There are problems that the structure becomes complicated, the number of parts increases, and the cost increases.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to disperse a solvent discharged from a feed tube in a rotary atomizing head and adhere the solvent to the rotary atomizing head. It is an object of the present invention to provide a rotary atomizing head type coating apparatus capable of washing paint in a short time.

Another object of the present invention is to provide a rotary atomizing head type coating apparatus capable of distributing and supplying a solvent to each paint outlet, the solvent outlet and each solvent passage. It is in.

[0018]

According to a first aspect of the present invention, there is provided a rotary atomizing head type coating apparatus comprising: an air motor provided in a cover; and a rotary shaft inserted in an axial direction of the air motor and rotated by the air motor. A rotating atomizing head attached to the rotating shaft and rotating at a high speed by the rotating shaft; and a paint or a paint extending from the tip extending in the rotating atomizing head and disposed in the rotating shaft in the axial direction. And a feed tube for discharging the solvent.

Then, in order to solve the above-mentioned problem,
The feature of the configuration adopted by the invention of claim 1 is that the feed tube is formed in a double cylindrical shape from an inner cylinder having an interior as a paint supply path and an outer cylinder having a solvent supply path between the inner cylinder and the inner cylinder. Forming
The opening of the outer cylinder is disposed behind the opening of the inner cylinder, and is arranged at the opening end of the inner cylinder in the radial direction to disperse the solvent discharged from the solvent supply path. The configuration is such that a protruding flange is provided.

With this configuration, when performing coating, the rotary atomizing head is rotated at a high speed together with the rotating shaft, and the paint is supplied from the paint supply passage of the feed tube. As a result, the paint is discharged as paint particles from the tip side of the rotary atomizing head while being diffused by centrifugal force, flies toward the object to be coated, and is applied to the object to be coated.

When the paint is changed to the next color paint, the previous color paint adhered to the paint supply path and the rotary atomizing head is washed with air / solvent, and then the next color paint is supplied. Fill in the supply channel.

In order to wash the paint adhered to the rotary atomizing head due to a temporary stop of the painting operation or the like when supplying the next color paint, the rotary atomizing head is rotated and the solvent is supplied from the solvent supply path of the feed tube. Discharge the solvent. At this time, the solvent discharged from the solvent supply passage collides with the flange portion that is located at the opening end of the inner cylinder and protrudes in the radial direction, and is dispersed by the flange portion. Then, the paint is dispersed in the rotary atomizing head and the paint adhered to the liquid contact surface of the rotary atomizing head is washed.

The rotary atomizing head type coating apparatus according to the second aspect of the present invention is characterized in that the rotary atomizing head has a bell-shaped or cup-shaped bell cup and an inner periphery of the bell cup. A hub member that is provided on the side and defines a paint reservoir that stores the paint discharged from the feed tube between the bell cup and the paint that is provided on the outer peripheral side of the hub member and that is discharged from the feed tube. Alternatively, a plurality of paint outlet holes for allowing the solvent to flow out from the paint reservoir toward the tip side of the bell cup, and a plurality of paint outlet holes are provided at a central portion of the hub member. The feed tube is formed in a double cylindrical shape from an inner cylinder having a paint supply passage therein and an outer cylinder having a solvent supply passage between the inner tube and the inner tube, Previous The opening of the outer cylinder located rearward of the opening of the inner cylinder is disposed, located on the open end of the inner tube
In order to supply a larger amount of the solvent discharged from the solvent supply path to each of the paint outflow holes than the solvent outflow holes, a radially projecting flange is provided.

With this configuration, when painting is performed, the rotary atomizing head is rotated at high speed together with the rotating shaft, and a part of the paint pool of the rotary atomizing head is defined from the paint supply path of the feed tube. The paint is discharged toward the rear surface of the hub member to be coated. As a result, the paint is diffused by the centrifugal force and flows out of the paint reservoir to the tip side of the bell cup through each paint outlet hole provided on the outer peripheral side of the hub member. And
The paint is released as paint particles from the tip side of the bell cup, flies toward the object to be coated, and is applied to the object to be coated.

When the paint is changed to the next color paint, the previous color paint adhered to the paint supply path and the rotary atomizing head is cleaned by air / solvent, and then the next color paint is supplied. Fill in the supply channel.

In order to wash the paint adhered to the rotary atomizing head due to a temporary stop of the painting operation or the like when supplying the next color paint, the rotary atomizing head is rotated and the solvent is supplied from the solvent supply passage of the feed tube. Dispense the solvent into the paint pool. At this time, the solvent discharged from the solvent supply path is
It collides with a flange portion which is located and protrudes in the radial direction, and is dispersed in the paint pool by the flange portion. As a result, a large amount of the solvent discharged from the feed tube is supplied to each paint outlet hole provided on the outer peripheral side of the hub member, and the paint adhered to the tip side of the bell cup is washed.

A part of the solvent dispersed in the paint reservoir flows out to the front surface of the hub member through a solvent outlet hole provided in the center of the hub member, and the paint adhered to the front surface of the hub member. Wash.

The rotary atomizing head type coating apparatus according to the third aspect of the present invention is characterized in that the rotary atomizing head has a bell cup formed in a bell shape or a cup shape, and an inner periphery of the bell cup. A hub member that is provided on the side and defines a paint reservoir that stores the paint discharged from the feed tube between the bell cup and the paint that is provided on the outer peripheral side of the hub member and that is discharged from the feed tube. Alternatively, a plurality of paint outlet holes for allowing the solvent to flow out from the paint reservoir toward the tip side of the bell cup, and a plurality of paint outlet holes are provided at a central portion of the hub member. A plurality of solvent outlets provided in the bell cup for allowing the solvent discharged from the feed tube to flow out of the paint reservoir to the outer peripheral surface of the bell cup; The feed tube is formed as a double cylinder from an inner cylinder having a paint supply path inside and an outer cylinder having a solvent supply path between the inner cylinder and an opening of the outer cylinder. The part is disposed behind the opening of the inner cylinder, in order to supply the solvent discharged from the solvent supply path also to the solvent path located at the opening end of the inner cylinder. The configuration is such that a flange protruding in the radial direction is provided.

With this configuration, when painting is performed, the rotary atomizing head is rotated at a high speed together with the rotating shaft, and a part of the paint pool of the rotary atomizing head is defined from the paint supply path of the feed tube. The paint is discharged toward the rear surface of the hub member to be coated. As a result, the paint is diffused by the centrifugal force and flows out of the paint reservoir to the tip side of the bell cup through each paint outlet hole provided on the outer peripheral side of the hub member. And
The paint is released as paint particles from the tip side of the bell cup, flies toward the object to be coated, and is applied to the object to be coated.

When the paint is changed to the next color paint, the paint of the previous color adhered to the paint supply path and the rotary atomizing head is cleaned by air / solvent, and then the next color paint is supplied. Fill in the supply channel.

In order to wash the paint adhered to the rotary atomizing head due to a temporary stop of the painting operation or the like when supplying the next color paint, the rotary atomizing head is rotated and the solvent is supplied from the solvent supply passage of the feed tube. Dispense the solvent into the paint pool. At this time, the solvent discharged from the solvent supply path is
It collides with a flange portion which is located and protrudes in the radial direction, and is dispersed in the paint pool by the flange portion. As a result, a large amount of the solvent discharged from the feed tube is supplied to each paint outlet hole provided on the outer peripheral side of the hub member, and the paint adhered to the tip side of the bell cup is washed.

Further, a part of the solvent dispersed in the paint reservoir flows out to the front surface of the hub member through a solvent outlet hole provided at the center of the hub member, and the paint adhered to the front surface of the hub member is removed. Wash.

On the other hand, a part of the solvent flows out to the outer peripheral surface of the bell cup through each solvent passage provided in the bell cup, and cleans the paint adhered to the outer peripheral surface of the bell cup.

According to a fourth aspect of the present invention, the flange is provided at an opening end of the inner cylinder.

With such a configuration, the flange can be provided integrally with the inner cylinder of the feed tube.

According to a fifth aspect of the present invention, the outer cylinder is provided with a support arm extending from the open end of the outer cylinder toward the open end of the inner cylinder , and the flange is located at the open end of the inner cylinder. The configuration is provided on the tip side of the arm.

With this configuration, a gap can be formed between the flange portion and the inner cylinder, and the state of dispersion of the solvent can be adjusted by the size of the gap.

According to a sixth aspect of the present invention, the flange is provided with a plurality of notches in a circumferential direction.

With this configuration, when the solvent is discharged from the solvent supply passage of the feed tube, a part of the solvent flows straight through each notch formed in the flange, and the other solvent flows. Solvent collide with the flange and disperse. Therefore, by appropriately adjusting the number and size of the notches, the solvent discharged from the solvent supply path can be distributed and supplied at a desired ratio.

[0040]

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

FIGS. 1 to 5 show a first embodiment of the present invention.

In the drawing, reference numeral 1 denotes a cylindrical cover which forms the outer shape of the rotary atomizing head type coating apparatus. An air motor 2 described later is provided in the cover 1, and a shaping air ring described later is provided at the tip end. 4 are attached.

Reference numeral 2 denotes an air motor provided in the cover 1. The air motor 2 includes a motor housing 2A formed in a stepped cylindrical shape, an air turbine (not shown) for rotating and driving a rotating shaft 3, which will be described later, and the like. It is configured. A high voltage is applied to the motor housing 2A by a high voltage generator (not shown).

3 is a motor housing 2A of the air motor 2.
The rotating shaft 3 is rotatably supported in the motor housing 2 </ b> A, and its base end is fitted to the air turbine of the air motor 2. Also,
The tip side of the rotating shaft 3 projects from the motor housing 2A,
A rotary atomizing head 6 described later is mounted.

Numeral 4 is a shaping air ring provided on the tip end side of the cover 1. The shaping air ring 4 is formed in a cylindrical shape, and a plurality of shaping air jet ports 4A, 4A,. Are shown in a ring.

Reference numeral 5 denotes a shaping air supply passage. The shaping air supply passage 5 is a passage 5 provided in the cover 1.
A, a plurality of passages 5B, 5B,... (Only two are shown) provided in the shaping air ring 4. The shaping air supply passage 5 supplies shaping air supplied from an air supply source (not shown) to each of the shaping air ejection ports 4A.

Here, the shaping air is ejected from each of the shaping air outlets 4A in the direction of arrow A in FIG. 1 to form a spray pattern of paint particles sprayed from the rotary atomizing head 6. It is.

Reference numeral 6 denotes a rotary atomizing head mounted on the rotating shaft 3. The rotary atomizing head 6 includes a bell cup 7, a hub member 8, a paint outlet 9, a thinner outlet 10, and a paint reservoir 1 to be described later.
1, a thinner passage 12 and the like.

Reference numeral 7 denotes a bell cup formed in a bell shape or a cup shape which expands from the rear side toward the front side, which is the outer shape of the rotary atomizing head 6, and the bell cup 7 is shown in FIG. As described above, the rear portion side is the rotating shaft mounting portion 7A screwed to the tip of the rotating shaft 3. An annular partition wall 7B is formed in the center of the bell cup 7 and protrudes inward in the radial direction. A distal end of a feed tube 17 protruding from a distal end side of the rotary shaft 3 is inserted into an inner peripheral side of the annular partition wall 7B. are doing.

Further, the inner peripheral side of the bell cup 7 gradually expands in a skirt shape from the annular partition wall 7B to the front end of the bell cup 7. The front side of the inner peripheral surface of the bell cup 7 is a paint thinning surface 7C for thinning the paint, and the tip side of the paint thinning surface 7C is a discharge edge 7D for releasing the paint. The rear side of the inner peripheral surface of the bell cup 7 is a paint receiving surface 7E for receiving paint or thinner. Further, a hub mounting groove 7F for mounting a hub member 8 is provided between the paint thinning surface 7C and the paint receiving surface 7E.
Are formed. Also, on the outer peripheral side of the bell cup 7,
A guide mounting step 7G is formed at an intermediate portion in the axial direction.

Numeral 8 denotes a hub member which is fitted into the hub mounting groove 7F of the bell cup 7 and defines a paint reservoir 11 between the bell cup 7 and the hub member 8. The hub member 8 is formed in a disk shape. 7 is arranged coaxially. The front surface 8A of the hub member 8 is a flat surface continuous with the paint thinning surface 7C of the bell cup 7, and the rear surface of the hub member 8 is a paint supply surface 8B. A conical protrusion 8C is provided at the center of the paint supply surface 8B.
Are formed.

Here, the paint thinning surface 7 of the bell cup 7
C, discharge edge 7D, paint receiving surface 7E, front surface 8 of hub member 8
A, the liquid supply surface of the rotary atomizing head 6 is constituted by the paint supply surface 8B and the like.

Numerals 9, 9,... Are a large number of paint outlet holes arranged in a ring on the outer peripheral side of the hub member 8. Alternatively, the thinner discharged from the thinner supply path 19 to the inner peripheral side of the bell cup 7 flows out from the paint reservoir 11 to the paint thinning surface 7C.

Are thinner outlet holes which are located at the center of the hub member 8 and are a plurality of solvent outlet holes penetrating from the paint supply surface 8B to the front surface 8A.
When cleaning the rotary atomizing head 6, the thinner discharged from the thinner supply passage 19 is transferred from the paint reservoir 11 to the front surface 8 of the hub member 8.
A.

Reference numeral 11 denotes a paint pool defined between the paint supply surface 8B of the hub member 8 and the paint receiving surface 7E of the bell cup 7 by mounting the hub member 8 in the hub mounting groove 7F of the bell cup 7. The paint pool 11 is a space for temporarily storing paint discharged from the paint supply path 18 or thinner discharged from the thinner supply path 19 and diffusing the paint or thinner.

Reference numerals 12, 12,... Denote thinner passages, which are provided in large numbers at predetermined intervals in the circumferential direction of the bell cup 7, and serve as solvent passages. The outlet 12B is open to the surface 7E, the outlet 12B is open to the outer peripheral surface 7H of the bell cup 7, and extends from the inner peripheral side to the outer peripheral side of the bell cup 7. Thereby, each thinner passage 12 is provided with a thinner supply passage 19 when the rotary atomizing head 6 is washed.
The thinner that has flowed into the paint reservoir 11 flows out of the paint reservoir 11 toward the outer peripheral side of the bell cup 7. As shown in FIG. 3, each thinner passage 12 opens its inlet 12A at a position which is deeper than each paint outlet hole 9 by a certain dimension G, and rotates the spray mist from the inlet 12A toward the outlet 12B. The rotary atomization head 6 is provided so as to be inclined in the rotation direction of the head 6 and twisted in the rotation direction of the rotary atomization head 6.

Reference numeral 13 denotes a guide mounting step 7G of the bell cup 7.
The annular guide 13 is provided at the base end of the ring guide 13 with a mounting portion 13A mounted on the guide mounting step 7G of the bell cup 7. From the mounting portion 13A to the front end side, the outer periphery of the bell cup 7 A bell-shaped or cup-shaped expanded portion 13B that forms a constant gap with the surface 7H
It has become.

A thinner diffusion chamber 14 is a solvent diffusion chamber formed between the inner peripheral surface of the expanded portion 13B of the annular guide 13 and the outer peripheral surface 7H of the bell cup 7, and the thinner diffusion chamber 14 is Are formed in an annular shape over the entire circumference, and outlets 12B of the respective thinner passages 12 are opened at the back.

Reference numeral 15 denotes an annular ridge provided on the inner peripheral surface of the expanded portion 13B of the annular guide 13. The annular ridge 15 is formed in an annular shape over the entire circumference of the annular guide 13, and has a bell cup. An annular throttle passage 16 is formed between the outer peripheral surface 7H and the outer peripheral surface 7H. The annular ridge 15 acts as a dam for temporarily blocking thinner flowing in the thinner diffusion chamber 14 toward the front side of the bell cup 7 when the rotary atomizing head 6 is washed. .

Reference numeral 17 denotes a feed tube which is inserted through the rotary shaft 3 in the axial direction, and the tip of which extends into the rotary atomizing head 6. The feed tube 17 includes, as shown in FIG. An outer cylinder 17B coaxially provided on the outer peripheral side of the inner cylinder 17A is formed in a double cylindrical shape, and the opening of the outer cylinder 17B is disposed behind the opening of the inner cylinder 17A. Have been. Also, on the tip side of the outer cylinder 17B,
A check valve 17C is provided, the tip of which resiliently abuts the outer peripheral surface of the inner cylinder 17A, and which opens when thinner as a solvent is supplied from the thinner supply passage 19. Further, a flange portion 20, which will be described later, is provided integrally with a distal end side of the inner cylinder 17A at an opening end thereof.

Here, the inside of the inner cylinder 17A becomes a paint supply passage 18 connected to a color changing valve device (neither is shown) through a paint pipe or the like, and the inner cylinder 17A and the outer cylinder 17 are connected.
An annular thinner supply path 19 serving as a solvent supply path connected to a thinner source (neither is shown) through a thinner pipe is provided between the thinner supply path 19 and B.

20 is an inner cylinder 17A of the feed tube 17
As shown in FIG. 4, the flange portion 20 is formed as an annular protrusion having a semicircular cross section that projects radially outward from the outer peripheral surface of the inner cylinder 17A. ing. Then, the collar portion 20 disperses the thinner by colliding the thinner discharged from the thinner supply passage 19, and supplies a large amount of thinner to the paint outlet holes 9 located on the outer peripheral side and the thinner passage 12 side. Things. In addition, some thinners have a flange 20 formed in a semi-circular shape so that scattering is suppressed, and the thinner outflow hole 1 located in the center is formed.
It is supplied to the 0 side.

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

First, when painting, the air motor 2
With this, the rotary atomizing head 6 is rotated at high speed together with the rotating shaft 3. Then, the paint is discharged from the paint supply path 18 of the feed tube 17 toward the paint reservoir 11 formed in the rotary atomizing head 6. As a result, the paint that has flowed into the paint reservoir 11 passes through each paint outlet 9 and flows out to the paint thinning surface 7C. Further, the paint is thinned on the paint thinning surface 7C, released from the discharge edge 7D, and atomized as paint particles.

At this time, since a high voltage is applied between the rotary atomizing head 6 and the object to be coated, the charged paint particles atomized by the rotary atomizing head 6 are connected to the ground side. The airplane flies along an electrostatic field formed between the object and the object, and is applied to the object. Further, the spray pattern of the paint at the time of this coating is formed into a desired pattern by shaping air jetted from each shaping air jet port 4A of the shaping air ring 4.

Next, a description will be given of the operation when the paint is changed to the next color paint. In this case, an air thinner is supplied from the color changing valve device, and the paint pipe, the paint supply path 18,
After the pre-color paint adhered to the rotary atomizing head 6 is washed, the next color paint is supplied from the color changing valve device to fill the paint supply path 18 and the like.

However, when the next color paint is supplied as described above, this paint is supplied from the paint supply path 18 to the rotary atomizing head 6.
And the front surface 8 of the hub member 8 of the rotary atomizing head 6
A, paint may adhere to the outer peripheral surface 7H of the bell cup 7 and the like. Further, when the painting operation is temporarily stopped due to a trouble in the painting line, a break during the lunch break, etc., the paint adhered to the inner peripheral surface of the bell cup 7 of the rotary atomizing head 6 may be solidified. is there. Further, when the same color paint is applied continuously for a long time, the paint adheres to the rotary atomizing head 6,
Will accumulate.

In such a case, the paint adhering to the rotary atomizing head 6 solidifies and peels off at the time of coating to cause poor coating. Need to be washed.

The operation for cleaning the paint adhered to each part of the rotary atomizing head 6 will now be described.

First, at the time of cleaning the rotary atomizing head 6, the rotary atomizing head 6 is rotated by the air motor 2 together with the rotary shaft 3.
The thinner is supplied from the thinner supply path 19. At this time, as shown in FIG. 3, the check valve 17 </ b> C is opened, and the thinner is discharged from the thinner supply path 19 to the paint reservoir 11.

Then, the thinner discharged from the thinner supply passage 19 collides with a radially projecting flange 20 at the tip of the inner cylinder 17A as shown in FIG. Spread. At this time, among the thinners dispersed in the paint reservoir 11, many thinners are supplied to the paint outlet holes 9 and the thinner passages 12 located on the outer peripheral side, and some of the thinners have a flange 20. Due to the semi-circular shape, scattering is suppressed, and each thinner outflow hole 10 located at the center is formed.
Supplied to the side.

Therefore, a large amount of thinner dispersed in the paint reservoir 11 and supplied to the paint outlet holes 9 flows into the paint outlet holes 9, and passes through the paint outlet holes 9 to pass through the bell cups. 7 flows out to the paint thinning surface 7C. As a result, the thinner can wash the paint adhered to the paint thinning surface 7C and the discharge edge 7D, and is released from the discharge edge 7D after the cleaning.

The thinner flowing into each of the thinner outflow holes 10 flows out to the front surface 8A of the hub member 8 through each of the thinner outflow holes 10, and cleans the paint adhered to the front surface 8A of the hub member 8. Then, the thinner flows through the paint thinning surface 7C and is discharged from the discharge edge 7D.

Further, the inlet 12A of each thinner passage 12
Flows into the outlet 12 of each thinner passage 12.
B flows out radially outward of the bell cup 7 from B. However, since the annular guide 13 is provided on the outer peripheral side of the bell cup 7 over the entire circumference, the thinner flowing out of each thinner passage 12 collides with the inner peripheral surface of the expanded portion 13B of the annular guide 13 and is thinned. It temporarily stays in the diffusion chamber 14. And
The thinner in the thinner diffusion chamber 14 is temporarily blocked by the dam action of the annular ridge portion 15,
Inside the bell cup 7 is diffused all around.

Thereafter, the thinner gets over the annular ridge 15, passes through the annular throttle passage 16, and is supplied to the outer peripheral surface 7 H front side of the bell cup 7 over the entire circumference. Thereby, the paint adhered to the outer peripheral surface 7H of the bell cup 7 can be completely washed over the entire circumference.

At this time, the thinner discharged from the feed tube 17 collides with the flange portion 20 and is dispersed, so that the condition of each paint outlet 9> each thinner outlet 10> each thinner passage 12 or each thinner outlet 12 is obtained. Paint outlet 9> Each thinner outlet 10 = Dispensed under the condition of each thinner passage 12.

The above-described painting operation of the preceding color, the color changing operation, and the painting operation of the next color are as shown in FIG. 5, and after the supply of the next color, the outer peripheral surface 7H of the bell cup 7 is formed by thinner and shaping air. And the like are shown for cleaning.

Thus, according to the present embodiment, when cleaning the liquid contact surface of the rotary atomizing head 6, the feed tube 17 is used.
Flange portion 20 protruding radially outward on the tip side of inner cylinder 17A
A large amount of thinner can be supplied to each paint outlet 9 side by colliding and dispersing the thinner discharged from the thinner supply path 19 to the paint outlet 9 side, and a part of the thinner can be supplied to each thinner passage 12 and each thinner outlet 10 side. Can be supplied. This allows
Since a large amount of thinner can be supplied to the paint thinning surface 7C and the discharge edge 7D to which the paint is most attached, which is a paint distribution channel, it is possible to prevent poor cleaning due to insufficient supply of thinner and shorten the cleaning time. As a result, the cleaning efficiency, the coating quality, the productivity, and the like can be improved, and the reliability of the rotary atomizing head type coating apparatus can be improved.

When cleaning the rotary atomizing head 6, the thinner supplied from the thinner supply passage 19 of the feed tube 17 flows into the thinner diffusion chamber 14 through each thinner passage 12, and the bell cup is By guiding the paint to the front of the bell cup 7, the paint adhered to the outer peripheral surface 7 </ b> H of the bell cup 7 can be washed. As a result, as compared with the case where a separate cleaning nozzle is provided as described in the related art, the bell cup 7 is prevented from bouncing off from the outer peripheral surface 7H.
The thinner can be supplied to the outer peripheral surface 7H by adapting it, the amount of thinner used can be minimized, and the cleaning efficiency can be improved. Thus, the design and structure of the coating apparatus can be simplified, the number of parts can be reduced, the cost can be reduced, and the like.

Further, the thinner flowing from each thinner passage 12 into the thinner diffusion chamber 14 can be diffused along the outer peripheral surface 7H of the bell cup 7 by the annular guide 13 to the entire periphery. The paint adhered to 7H can be washed over the entire circumference.

FIGS. 6 to 8 show a second embodiment of the present invention. The feature of this embodiment is that a plurality of notches are provided in the flange in the circumferential direction. In this embodiment,
The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 31 denotes a feed tube according to the present embodiment which is used in place of the feed tube 17 according to the first embodiment. The feed tube 31 is similar to the feed tube 17 described in the first embodiment. , Inner cylinder 31A
And an outer cylinder 31 provided coaxially on the outer peripheral side of the inner cylinder 31A.
And B, and is formed in a double cylindrical shape, and the opening of the outer cylinder 31B is disposed behind the opening of the inner cylinder 31A. Further, a check valve 31C is provided on the tip side of the outer cylinder 31B. Further, the interior of the inner cylinder 31A becomes a paint supply path 32, and the inner cylinder 31A and the outer cylinder 3
1B, an annular thinner supply path 33 serving as a solvent supply path.
It has become.

Reference numeral 34 denotes an outer cylinder 31B of the feed tube 31.
In this embodiment, the flange 34 is provided at the opening end of the inner cylinder 31A at the front of the inner cylinder 31A. The flange 34 is substantially the same as the flange 20 according to the first embodiment, as shown in FIG. , Inner cylinder 3
It is formed to protrude radially outward from the outer peripheral surface of 1A. However, the flange portion 34 according to the present embodiment is different from the flange portion 20 according to the first embodiment in that a cross-sectional shape thereof is rectangular and a notch 35 described later is formed.

Are a plurality of cutouts formed in the flange 34. As shown in FIG. 8, four cutouts 35 are provided at intervals of 90 ° in the circumferential direction of the flange 34, for example. Have been. Each notch 35 is formed so as to penetrate the flange 34 in the axial direction.

As described above, when the thinner is discharged from the thinner supply passage 33 of the feed tube 31 as shown by the arrow in FIG. After passing through, it flows straight and is supplied to each thinner outflow hole 10 formed at the center of the hub member 8. Also,
The other thinners collide with the flange portion 34 to be dispersed and supplied to the respective paint outlet holes 9 provided on the outer peripheral side of the hub member 8 and the respective thinner passages 12 opened in the paint receiving surface 7E of the bell cup 7.

Thus, in the present embodiment constructed as described above, substantially the same operation and effect as those in the first embodiment can be obtained. In particular, in this embodiment, each notch is formed in the flange 34. Since the cutouts 35 are provided, the size, shape, and number of the cutouts 35 are appropriately set so that the thinner can be inserted into each of the paint outlet holes 9, each of the thinner outlet holes 10, and each of the thinner passages 12. 9> Each thinner outlet 10> Each thinner passage 12 or each paint outlet 9> Each thinner outlet 10 = Each thinner passage 12 can be distributed and supplied. As a result, the paint adhered to the liquid contact surface of the rotary atomizing head 6 can be effectively washed,
It is possible to improve the cleaning capability such as the reduction of the amount of thinner used and the cleaning time, and to improve the reliability of the rotary atomizing head type coating apparatus.

Next, FIGS. 9 and 10 show a third embodiment of the present invention. This embodiment is characterized in that an outer cylinder of a feed tube is provided with a support arm extending forward, and a distal end of the support arm is provided. That is, a flange is provided on the side. 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 figure, reference numeral 41 denotes a feed tube according to the present embodiment which is used in place of the feed tube 17 according to the first embodiment. The feed tube 41 is similar to the feed tube 17 described in the first embodiment. , Inner cylinder 41A
And an outer cylinder 41 provided coaxially on the outer peripheral side of the inner cylinder 41A.
And B, and is formed in a double cylindrical shape, and the opening of the outer cylinder 41B is disposed behind the opening of the inner cylinder 41A. Further, a check valve 41C is provided on the tip side of the outer cylinder 41B. Further, the inside of the inner cylinder 41A becomes a paint supply path 42, and the inner cylinder 41A and the outer cylinder 4
1B, an annular thinner supply path 43 serving as a solvent supply path.
It has become.

Reference numerals 44, 44,... Denote, for example, three support arms provided at the open end of the outer tube 41B of the feed tube 41.
As shown in FIG. 10, the support arms 44 are arranged at equal intervals in the circumferential direction of the outer cylinder 41B, and the base end is fixed to the outer peripheral surface of the outer cylinder 41B by fixing means such as welding or bonding. The distal end side of each support arm 44 extends forward and bends inward, and a flange 45 described later is provided at the distal end.

Reference numeral 45 denotes a flange according to the present embodiment fixed to the distal end of each support arm 44. The flange 45 is located in front of the outer cylinder 41B of the feed tube 41 and closes the open end of the inner cylinder 41A. An annular gap 46 is formed between the inner cylinder 41A and the inner cylinder 41A.

The flange 45 is connected to the feed tube 4.
When the thinner is discharged from the first thinner supply passage 43, a part of the thinner passes straight through the gap 46 between the thinner supply passage 43 and the inner cylinder 41A, and flows out of each thinner formed at the central portion of the hub member 8. Feed into hole 10. Further, other thinners collide with the flange portion 45 to be dispersed and supplied to the respective paint outlet holes 9 provided on the outer peripheral side of the hub member 8 and the respective thinner passages 12 opened in the paint receiving surface 7E of the bell cup 7. I do.

Thus, in the present embodiment having such a structure, substantially the same operation and effect as those of the first embodiment can be obtained. In particular, in the present embodiment, the flange 45 and the inner cylinder 41A are provided. Since the gap 46 is formed between the thinner and the thinner, by appropriately setting the size of the gap 46, the thinner is distributed to the paint outlet holes 9, the thinner outlet holes 10, and the thinner passages 12 by a required amount. Can be supplied.

FIG. 11 shows a fourth embodiment of the present invention, which is characterized in that the annular guide is eliminated from the rotary atomizing head.

Reference numeral 51 denotes a rotary atomizing head according to this embodiment which is used in place of the rotary atomizing head 6 according to the first embodiment. The rotary atomizing head 51 includes a bell cup 52 and a hub member 5 which will be described later.
3, paint outlet hole 54, thinner outlet hole 55, paint reservoir 5
6, a thinner passage 57, an annular dam groove 58, and the like.

Reference numeral 52 denotes a bell-shaped or cup-shaped bell cup which forms the outer shape of the rotary atomizing head 51 and expands from the rear side toward the front side. In substantially the same manner as the bell cup 7 described in the embodiment, the rotating shaft mounting portion 52A, the annular partition wall 52B, the paint thinning surface 52C,
Release edge 52D, paint receiving surface 52E, hub mounting step 52
F and an outer peripheral surface 52G.

Reference numeral 53 denotes a hub mounting step 52 of the bell cup 52.
The hub member 53 is formed in a disk shape, substantially the same as the hub member 8 described in the first embodiment, and has a front surface 53A, a paint supply surface 53B, and a conical shape. It has a projection 53C. Are provided on the outer peripheral side of the hub member 53, and thinner outlet holes 55 serving as a plurality of solvent outlet holes are provided at the center of the hub member 53. Further, the hub member 53 defines a paint reservoir 56 between the hub member 53 and the bell cup 52.

Here, the paint thinning surface 5 of the bell cup 52
2C, discharge edge 52D, paint receiving surface 52E, hub member 53
The liquid contact surface of the rotary atomizing head 51 is constituted by the front surface 53A, the paint supply surface 53B, and the like.

Are thinner passages (only two are shown) which are provided as a plurality of solvent passages at predetermined intervals in the circumferential direction of the bell cup 52, and each of the thinner passages 57 is the first thinner passage. Similarly to the thinner passage 12 described in the embodiment, the thinner flowing from the paint reservoir 56 to the inflow port 57A is transferred to the outflow port 57A.
B flows out to the outer peripheral surface 52 </ b> G of the bell cup 52.

Reference numeral 58 denotes an annular dam groove provided on the outer peripheral surface 52G of the bell cup 52. The annular dam groove 58 is formed as an annular V-shaped groove between each thinner passage 57 and the discharge edge 52D. Have been. The annular dam groove 58 temporarily stores the thinner flowing out of each thinner passage 57, and transfers the thinner to the outer peripheral surface 52 </ b> G of the bell cup 52.
Is to be diffused uniformly.

Thus, also in the present embodiment having the above-described structure, it is possible to obtain substantially the same operation and effect as those of the first embodiment.

Next, FIG. 12 shows a fifth embodiment of the present invention, which is characterized in that the thinner passage and the annular dam groove are eliminated from the rotary atomizing head. In this embodiment,
The same components as those of the above-described fourth embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 61 denotes a rotary atomizing head according to the present embodiment, and 62 denotes a bell-shaped or cup-shaped bell-shaped or cup-shaped member which forms the outer shape of the rotary atomizing head 61 and expands from the rear side toward the front side. The bell cup 62 includes a rotating shaft mounting portion 62A, an annular partition wall 62B, a paint thinning surface 62C, a discharge edge 62D,
It has a paint receiving surface 62E, a hub mounting step 62F, and an outer peripheral surface 62G.

Here, the paint thinning surface 6 of the bell cup 62
2C, a discharge edge 62D, a paint receiving surface 62E and the fourth
The liquid contact surface of the rotary atomizing head 61 is constituted by the front surface 53A of the hub member 53, the paint supply surface 53B and the like described in the embodiment.

Thus, in this embodiment having the above-described structure, substantially the same operation and effect as those of the above-described embodiments can be obtained. However, in this embodiment, since the thinner passage 12 is omitted, The flange portion 20 may be configured so that the thinner distribution condition is such that each paint outlet hole 54> each thinner outlet hole 55.

In the first embodiment, the flange 20 has been described as being provided integrally with the inner cylinder 17A of the feed tube 17, but the present invention is not limited to this, and the flange is provided separately. It may be configured to be attached to the inner cylinder using means such as bonding, fitting, or the like.

Further, in the second embodiment, the case where four notches 35 are provided at 90 ° intervals in the flange 34 has been described as an example. However, the present invention is not limited to this. Two, three, or five or more portions may be provided, and their shapes and sizes are not limited to those of the embodiment.
That is, the size, shape, number, and the like of the cutouts 35 are appropriately set according to the amount of thinner discharged, the distribution ratio to each part, and the like.

In the third embodiment, the flange 45 is described as being supported by the three support arms 44.
It is good also as a structure which supports a collar part with two or four or more support arms.

Further, in the third embodiment, the inner cylinder 41
Although the case where the annular gap 46 is formed between A and the flange 45 has been described as an example, the gap is not necessarily formed, and the inner peripheral surface of the flange contacts the outer peripheral surface of the inner cylinder. May be.

In each of the above embodiments, the rotary atomizing heads 6, 51, 61 formed in a bell shape or a cup shape expanding from the rear side toward the front side have been described as an example. Alternatively, the present invention may be applied to a long cylindrical rotary atomizing head.

On the other hand, in each of the above embodiments, the air motor 2,
A direct charging type rotary atomizing head type coating apparatus for applying a high voltage to paint sprayed from the rotary atomizing heads 6, 51, 61 via the feed tubes 17, 31, 41, etc. has been described as an example. Alternatively, the present invention may be applied to an indirect charging type rotary atomizing head type coating apparatus in which a corona discharge region is formed in front of the rotary atomizing head by an external electrode, and a high voltage is applied to the sprayed paint. Alternatively, the present invention may be applied to a non-electrostatic rotary atomizing head type coating apparatus.

[0111]

As described above in detail, according to the first aspect of the present invention, since the flange protruding in the radial direction is provided at the open end of the inner tube of the feed tube, the solvent supply to the feed tube is provided. The solvent discharged from the path can collide with the flange to disperse in the rotary atomizing head, and the paint adhering to the liquid contact surface of the rotary atomizing head can be washed in a short time. In addition to being able to prevent poor cleaning of the paint due to an insufficient amount, the cleaning time can be shortened, and the efficiency of cleaning the paint, the coating quality, and the productivity can be improved.

According to the second aspect of the present invention, since the flange protruding in the radial direction is provided at the opening end of the inner cylinder of the feed tube, the solvent discharged from the solvent supply passage of the feed tube is provided with the flange. To be able to disperse the paint in the paint pool by colliding with it and supply a large amount of solvent to each paint outlet hole provided on the outer peripheral side of the hub member to wash the paint attached to the tip side of the bell cup. Can be. Further, a part of the solvent dispersed in the paint reservoir is caused to flow out to a front surface of the hub member through a solvent outlet hole provided in a central portion of the hub member, and the paint adhered to the front surface of the hub member is washed. Can be. As a result, the paint adhered to the rotary atomizing head can be washed in a short time, and the washing efficiency, paint quality, and productivity of the paint can be improved.

According to the third aspect of the present invention, since the flange protruding in the radial direction is provided at the opening end of the inner cylinder of the feed tube, the solvent discharged from the solvent supply passage of the feed tube is provided with the flange. To be able to disperse the paint in the paint pool by colliding with it and supply a large amount of solvent to each paint outlet hole provided on the outer peripheral side of the hub member to wash the paint attached to the tip side of the bell cup. Can be. Further, a part of the solvent dispersed in the paint reservoir is caused to flow out to a front surface of the hub member through a solvent outlet hole provided in a central portion of the hub member, and the paint adhered to the front surface of the hub member is washed. Can be. On the other hand, a part of the solvent can be caused to flow out to the outer peripheral surface of the bell cup via each solvent passage provided in the bell cup, and the paint adhered to the outer peripheral surface of the bell cup can be washed.

As a result, the paint adhering to the rotary atomizing head can be washed in a short time, and the paint washing efficiency, coating quality, and productivity can be improved. Can be prevented and reliability can be improved.

According to the fourth aspect of the present invention, since the flange can be formed integrally with the inner tube of the feed tube,
The flange can be easily formed.

According to the fifth aspect of the present invention, by forming a gap between the flange portion and the inner cylinder, the size of the gap can be adjusted to easily adjust the solvent distribution ratio. The paint adhered to the liquid contact surface and the outer peripheral surface of the rotary atomizing head can be effectively cleaned.

According to the sixth aspect of the present invention, since a plurality of notches are provided in the flange in the circumferential direction, a part of the solvent discharged from the solvent supply passage of the feed tube can be removed.
It can flow straight through the notch formed in the flange, and can disperse other solvents by colliding with the flange. Therefore, by appropriately adjusting the number and size of the notches, the solvent discharged from the solvent supply path can be distributed and supplied at a desired ratio, and the liquid contact surface and the outer periphery of the rotary atomizing head can be supplied. The paint adhered to the surface can be effectively cleaned.

[Brief description of the drawings]

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

FIG. 2 is an enlarged longitudinal sectional view showing a rotary atomizing head in FIG. 1;

FIG. 3 is an enlarged vertical sectional view of a main part in FIG. 1, showing a state in which the rotary atomizing head is being cleaned.

FIG. 4 is an enlarged longitudinal sectional view of a main part, which shows an arrow a part in FIG. 3 in an enlarged manner.

FIG. 5 is an operation explanatory view showing a painting operation and a cleaning operation.

FIG. 6 is an enlarged vertical sectional view of a main part of a rotary atomizing head, a feed tube, and a flange according to a second embodiment of the present invention, as viewed from the same position as in FIG.

FIG. 7 is an enlarged longitudinal sectional view of a main part, which shows an arrow b part in FIG. 6 in an enlarged manner.

FIG. 8 is a left side view showing the collar portion in FIG. 7 from a direction indicated by arrows VIII-VIII.

FIG. 9 is an enlarged vertical cross-sectional view of a main part of a feed tube, a flange, and the like according to a third embodiment of the present invention, viewed from the same position as in FIG.

FIG. 10 is a left side view showing the collar portion in FIG. 9 from the direction of arrows XX.

FIG. 11 is a longitudinal sectional view showing a rotary atomizing head according to a fourth embodiment of the present invention from the same position as in FIG. 2;

FIG. 12 is a longitudinal sectional view showing a rotary atomizing head according to a fifth embodiment of the present invention from the same position as in FIG. 2;

[Explanation of symbols]

 Reference Signs List 1 cover 2 air motor 3 rotating shaft 6, 51, 61 rotary atomizing head 7, 52, 62 bell cup 7H, 52G, 62G outer peripheral surface 8, 53 hub member 8A, 53A front surface 9, 54 paint outflow hole 10, 55 thinner outflow Hole (solvent outflow hole) 11,56 Paint reservoir 12,57 Thinner passage (solvent passage) 17,31,41 Feed tube 17A, 31A, 41A Inner cylinder 17B, 31B, 42A Outer cylinder 18,32,42 Paint supply path 19 , 33, 43 Thinner supply path (solvent supply path) 20, 34, 45 Flange 35 Notch 44 Support arm 46 Gap

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-152568 (JP, A) JP-A-56-102958 (JP, A) JP-A-5-63656 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) B05B 3/10

Claims (6)

(57) [Claims] 1. An air motor provided in a cover, a rotary shaft inserted in an axial direction of the air motor and rotated by the air motor, and a rotary atomizing head mounted on the rotary shaft and rotated at a high speed by the rotary shaft. And a rotary atomizing head type coating apparatus comprising: a feed tube configured to extend in the rotary shaft in the axial direction and discharge paint or a solvent from a tip extending into the rotary atomizing head. The feed tube is formed in a double cylindrical shape from an inner cylinder in which the interior has become a paint supply path and an outer cylinder having a solvent supply path between the inner cylinder, and an opening of the outer cylinder is formed in the inner cylinder. It is arranged so as to be located behind the opening, and is provided with a flange portion that is located at the opening end of the inner cylinder and radially protrudes to disperse the solvent discharged from the solvent supply path. Rotary atomizing head type coating equipment. 2. An air motor provided in a cover, a rotating shaft inserted in an axial direction of the air motor and rotated by the air motor, and a rotary atomizing head mounted on the rotating shaft and rotating at a high speed by the rotating shaft. And a rotary atomizing head type coating apparatus comprising: a feed tube configured to extend in the rotary shaft in the axial direction and discharge paint or a solvent from a tip extending into the rotary atomizing head. The rotary atomizing head has a bell cup formed in a bell shape or a cup shape, and a paint pool that is provided on the inner peripheral side of the bell cup and that stores paint discharged from the feed tube between the bell cup. A hub member to be defined, and a plurality of coatings provided on the outer peripheral side of the hub member and configured to allow the paint or solvent discharged from the feed tube to flow from the paint reservoir to the tip side of the bell cup. An outlet hole, and a solvent outlet hole provided at a central portion of the hub member for allowing the solvent discharged from the feed tube to flow out of the paint reservoir to the front surface of the hub member; The inner cylinder that has become the path and the outer cylinder that has become the solvent supply path between the inner cylinder and the outer cylinder are formed in a double cylinder shape, and the opening of the outer cylinder is located behind the opening of the inner cylinder. And a flange protruding in the radial direction to supply a larger amount of the solvent discharged from the solvent supply passage to the paint outlet than the solvent outlet through the opening end of the inner cylinder. A rotary atomizing head type coating apparatus, characterized in that a part is provided. 3. An air motor provided in a cover, a rotating shaft inserted in the axial direction of the air motor and rotated by the air motor, a rotary atomizing head mounted on the rotating shaft and rotating at a high speed by the rotating shaft. And a rotary atomizing head type coating apparatus comprising: a feed tube configured to extend in the rotary shaft in the axial direction and discharge paint or a solvent from a tip extending into the rotary atomizing head. The rotary atomizing head has a bell cup formed in a bell shape or a cup shape, and a paint pool that is provided on the inner peripheral side of the bell cup and that stores paint discharged from the feed tube between the bell cup. A hub member to be defined, and a plurality of coatings provided on the outer peripheral side of the hub member and configured to allow the paint or solvent discharged from the feed tube to flow from the paint reservoir to the tip side of the bell cup. An outflow hole, a solvent outflow hole provided in the center of the hub member, for allowing the solvent discharged from the feed tube to flow out of the paint reservoir to the front surface of the hub member, and a solvent outflow hole provided in the bell cup, from the feed tube. A plurality of solvent passages for allowing the discharged solvent to flow out of the paint reservoir to the outer peripheral surface of the bell cup, wherein the feed tube has a solvent supply passage between the inner cylinder having an interior paint supply passage and the inner cylinder. A double cylinder from the outer cylinder that has become the path, the opening of the outer cylinder is located behind the opening of the inner cylinder, and is disposed at the opening end of the inner cylinder. A rotary atomizing head type coating apparatus, characterized in that a flange protruding in a radial direction is provided to supply the solvent discharged from the solvent supply path also to the solvent path. 4. The rotary atomizing head type coating apparatus according to claim 1, wherein the flange is provided at an opening end of the inner cylinder. 5. The outer cylinder is provided with
A support arm that extends toward the open end is provided, wherein the flange portion is the
4. The rotary atomizing head type coating apparatus according to claim 1, wherein the rotary atomizing head type coating apparatus is configured to be provided at the opening end of the inner cylinder and at the tip side of the support arm. 6. The rotary atomizing head type coating apparatus according to claim 1, wherein the flange is provided with a plurality of notches in a circumferential direction.