JP3361140B2 - Rotary atomizing 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 an improvement of a rotary atomizing coating apparatus having a bell-shaped head at the tip of a casing.

[0002]

2. Description of the Related Art Heretofore, as a rotary atomizing coating apparatus of this type, for example, as disclosed in Japanese Patent Laid-Open No. 57-45370, a bell-shaped head rotatably supported at the tip of a casing, The bell-shaped head is provided with a paint passage whose tip is opened and whose base end is connected to a paint supply source. The paint supplied from the paint supply source to the bell-shaped head through the paint passage is supplied to the bell-shaped head. It is known that atomization is performed by rotation to coat an object to be coated. The rotary atomizing coating device includes a plurality of paint supply sources for different coating colors, a plurality of switching valves for appropriately switching the paint supply sources to the base end of the paint passage, and a base of the paint passage. It has a cleaning passage that is connected to the end and that cleans the inside of the paint passage with a cleaning agent.Each time the coating color is changed, the paint inside the paint passage is expelled by compressed air etc. to clean the inside of the paint passage with the cleaning agent. After repeating the operation, the switching valve for the paint color to be changed is opened so that the paint supply source for the paint color communicates with the paint passage, and the paint is supplied into the bell-shaped head through the paint passage. There is.

[0003]

However, in the above-mentioned conventional rotary atomizing coating apparatus, it is necessary to wash the inside of the paint passage with the cleaning agent every time the coating color is changed. Therefore, the coating material is changed every time the coating color is changed. The paint in the passage must be discarded, resulting in a large loss of paint.

Further, every time the coating color is changed, the interior of the paint passage must be washed from the base end to the tip, and a large amount of cleaning agent is required. Moreover, since paints of different paint colors are supplied by also using a single paint passage, it is necessary to repeat washing 2-3 times when changing from white to black, which is very difficult to change the paint color. It will take time.

The present invention has been made in view of the above points, and an object thereof is to appropriately open the respective tips of a plurality of paint passages for different paint colors and a washing passage into a bell-shaped head. The objective is to minimize paint loss and cleaning agent for each paint color change, and to greatly shorten the paint color change time.

[0006]

In order to achieve the above-mentioned object, a means for solving the problems according to the invention described in claim 1 is a bell-shaped head rotatably supported at a tip of a casing, and an inner circumference of the bell-shaped head. The front end is opened to the surface side, and the base end is provided with a paint passage connected to a paint supply source, and the paint supplied from the paint supply source into the bell-shaped head through the paint passage is rotated by the bell-shaped head. It is premised on a rotary atomizing coating device that atomizes and coats an object to be coated. Then, a plurality of paint passages for different coating colors are arranged on the inner peripheral surface side of the bell-shaped head in a nested manner so as to be positioned radially outwardly and concentrically with respect to the rotation center of the bell-shaped head. And opening the cleaning passage for cleaning the tip of each paint passage and the inner peripheral surface of the bell-shaped head with a cleaning agent so as to be located concentrically with respect to the center of rotation of the bell-shaped head, At least one paint passage in each of the above paint passages
Channel to each of the paint sources whose base ends are of similar color.
In addition to forming in a dual-purpose paint passage that is similar color,
The cleaning passage should be cleaned in the one paint passage.
The configuration is such that the base end of the one paint passage is also connected .

Further, the solution means taken by the invention according to claim 2 is to specify the cleaning passage and each paint passage of the invention according to claim 1 and to locate the cleaning passage outside the respective paint passages. The cleaning passage and the paint passage so that the tips of the washing passage and the paint passage are protruded into the bell-shaped head toward the tip end in the axial direction of the bell-shaped head in order from the rotation center of the bell-shaped head. It is configured so that it can be sequentially formed for a long time.

[0008]

With the above construction, in the invention according to claim 1,
When changing the coating color by a plurality of paint passages and washing passages, which are arranged concentrically radially outward with respect to the center of rotation of the bell-shaped head and each tip is opened inside the bell-shaped head, Only the tip of each paint passage and the inner peripheral surface of the bell-shaped head need only be washed, and it is no longer necessary to wash the paint passage with a cleaning agent each time the coating color is changed. The paint inside can be stored without being discarded.

Further, as described above, when the coating color is changed, only the tip of each paint passage and the inner peripheral surface of the bell-shaped head need only be washed, so that the interior of the paint passage changes from the base end to the tip every time the paint color is changed. There is no need to wash over, and a small amount of cleaning agent is required.
Moreover, according to a plurality of paint passages having different paint colors,
Even when changing from white to black, etc., it is only necessary to clean only the tip of each paint passage and the inner peripheral surface of the bell-shaped head. The cleaning time is greatly reduced.

Further, the dual-purpose paint passages of similar colors
Cleans the inside of the passage by the washing passage connected to its base end.
Since it is designed to be applied, the color can be applied by the dual-purpose paint passage
Only when changing the inside of the dual-purpose paint passage from the base end to the tip
It is washed, but this wash is easy because it has a similar color.
Simply done, cleaning agents are effectively saved. Moreover, the paint color
It is possible to save the cleaning time of the dual-purpose paint passage when changing.

According to the second aspect of the present invention, the tip of each of the outermost cleaning passage and each paint passage is formed so as to be long in order from the rotation center of the bell-shaped head. With the cleaning agent supplied from the tip of the cleaning passage, the inner peripheral surface of the bell-shaped head is effectively washed, and the tip of each paint passage that becomes longer is effective toward the center of rotation of the bell-shaped head. Will be washed.

[0012]

As described above, according to the rotary atomizing coating apparatus of the present invention, the tip of each paint passage and the washing passage concentric with the bell-shaped head is opened in the bell-shaped head. Therefore, only the tip of each paint passage and the inner surface of the bell-shaped head need to be cleaned when changing the paint color, and the paint loss in the paint passage can be eliminated at each paint color change, and the loss of paint can be reduced. The cleaning agent can be minimized, and the cleaning time when changing the coating color can be significantly shortened.

Further, the cleaning of the dual-purpose paint passage is performed by the cleaning passage.
Since it is a similar color, it was easy to do it once, so wash it
The agent can be saved effectively and the paint color can be changed.
It is possible to shorten the cleaning time for the dual-purpose paint passage.
Wear.

According to the rotary atomizing coating apparatus of the second aspect of the present invention, the inner peripheral surface of the bell-shaped head can be effectively cleaned by the cleaning agent from the outermost cleaning passage, and the cleaning head can be gradually lengthened. The tip of each paint passage can be effectively washed toward the center of rotation of the bell-shaped head.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a rotary atomizing coating apparatus according to an embodiment of the present invention. The rotary atomizing coating apparatus 1 is covered with a hollow casing 2 formed in a shell shape, and the tip thereof. While being opened to the outside, the base end side is attached to an arm of a robot (not shown) so that the rotary atomizing coating device 1 can be moved. The tip of the casing 2 is
It is formed in a tapered shape, and a bell-shaped head 3 is rotatably supported at the tip of this casing 2. The bell-shaped head 3 is fixed to the tip of a motor shaft 5 having a substantially T-shaped cross section that is rotated by an air motor 4 provided in the casing 2.

Further, inside the casing 2, there are provided first to third paint passages 11, 12 and 13 each having an open end on the inner peripheral surface side of the bell-shaped head 3.
In addition, a cleaning passage 14 having an opening at the inner peripheral surface side of the bell-shaped head 3 is provided in the casing 2. The paint passages 11, 12, 13 and the washing passage 14 are arranged so as to be located radially outwardly and concentrically with respect to the axis of the motor shaft 5 which coincides with the rotation center of the bell-shaped head 3. It is distributed. That is, the first paint passage 11 is formed by the concentric pipe 11a having a circular cross section centered on the shaft core of the motor shaft 5 and is located on the innermost peripheral side, and the second paint passage 12 is located on the shaft core of the motor shaft 5. A third paint passage 13 is formed by a small-diameter concentric tube 12a having an annular cross-section having a center, and a third paint passage 13 has an annular cross-section having a center on the axis of the motor shaft 5 on the outer peripheral side of the first paint passage 11. Medium diameter concentric tube 13
a formed on the outer peripheral side of the second paint passage 12,
The cleaning passage 14 is formed by a large-diameter concentric pipe 14a having an annular cross-section centered on the axis of the motor shaft 5, and is disposed at the outer peripheral side of the third paint passage 13, that is, the outermost peripheral side. ing.

In the paint passages 11, 12, 13 and the washing passage 14, the concentric pipes 11a to 14a project toward the base end side in the casing 2 from the base end of the motor shaft 5, and the outermost peripheral side is washed. A circular pipe 11b having a circular cross section formed by bending the passage 14 through the third paint passage 13, the second paint passage 12, and the first paint passage 11 upward in the casing 2 at substantially right angles.
To 14b are integrally connected. A first trigger device 21 for supplying or blocking paint from a paint supply source 31 (described later) to the first paint passage 11 is provided on the base end side of the casing 2. Further, on the upper side outside the casing 2, paint supply sources 32, 33 for the second and third paint passages 12, 13 are provided.
Second and third trigger devices 22 and 23 for supplying or blocking paint from (described later) are respectively provided, and a cleaning agent supply source 34 for the cleaning passage 14 is provided.
A fourth trigger device 24 is provided for supplying or blocking the cleaning agent (described later). The first trigger 21 is arranged on the axis of the motor shaft 5 so as to be movable back and forth, and is inserted into the concentric tube 11a of the first paint passage 11 from the base end thereof, and the tip of the needle 21a. The narrow portion 11c provided in the middle of the concentric tube 11a and having a narrow cross section is closed when the needle advances, while the narrow portion 11c is closed.
An opening / closing valve 21b that opens c when the needle exits, and a needle 21a provided on the proximal end side of the needle 21a.
An urging spring (not shown) that urges the
An air chamber 21c is provided at the proximal end side of the needle 21a and moves the needle 21a in the retreating direction against the biasing force of the biasing spring by the supply of air from an air supply device (not shown). On the other hand, the above second to fourth
The triggers 22, 23, 24 include the second and third paint passages 12,
13 and circular pipes 12b, 13b, 14 of the cleaning passage 14
a needle 22a that is inserted into the b so as to be able to move back and forth from the base end,
23a, 24a and the respective needles 22a, 23a, 24
A narrow portion 12c, 13c, 14 provided at the tip of a and provided in the middle of each of the circular tubes 12b, 13b, 14b with a narrow cross section
While c is closed when the needle advances, the narrow portions 12c, 1
Open / close valve 2 that opens 3c and 14c when the needle exits
2b, 23b, 24b and the above-mentioned needles 22a, 23
a, 24a provided on the proximal end side of each needle 22a, 2a
An urging spring (not shown) for urging the needles 3a and 24a in the advancing direction, and a base end side of the needle 21a,
It is provided with an air chamber (not shown) for moving the needles 22a, 23a, 24a in the retreat direction against the biasing force of the biasing spring by the supply of air from an air supply device (not shown).

Further, as shown in FIG. 2, the first paint passage 1 is provided at the base end of the circular pipe 11b of the first paint passage 11.
1 is connected to a blue-based first paint supply source 31 that supplies a blue-based paint. The first paint supply source 31 has a blue paint supply part 31a, a cyan paint supply part 31b, and a black paint supply part 31c, and each of the paint supply parts 31a to 31a.
31 c is adapted to be switchably connected to the base end of the circular pipe 11 b through a switching valve (not shown) so that the first paint passage 11 is a blue-based first combined use paint passage 41. Is formed in. In addition, the circular pipe 12 of the second paint passage 12
A white-based second coating material supply source 32 for supplying a white-based coating material to the second coating material passage 12 is connected to the base end of b. The second paint supply source 32 is a white paint supply section 32a.
And a silver-colored paint supply section 32b, and each of the paint supply sections 32a and 32b is provided with a circular pipe 1 via a switching valve (not shown).
The second paint passage 12 is formed in a second combined-use paint passage 42 which is arranged in a white color so that the second paint passage 12 can be switched to the base end of 2b so that it can be connected and disconnected. Further, at the base end of the circular pipe 13b of the third paint passage 13, a red-based third paint supply source 3 for supplying a red paint to the third paint passage 13 is provided.
3 is connected. The third paint supply source 33 has a red paint supply part 33a and an orange paint supply part 33b, and each of the paint supply parts 33a and 33b is connected to a circular pipe 13b via a switching valve (not shown). The third paint passage 13 is formed in a red-colored third combined-use paint passage 43 so that it can be switched to and disconnectable from the base end. And
From the above paint supply sources 31 to 33, the combined paint passages 41 to 41
The paint supplied into the bell-shaped head 3 via 43 is atomized by the rotation of the bell-shaped head 3 via the motor shaft 5 by the air motor 4 to coat the object to be coated. A high voltage of 90,000 volts is applied to the bell-shaped head 3 from the high-voltage supply member 45 provided in the casing 2 through the motor shaft 5, and the high voltage of 90,000 volts is bell-shaped. By being applied to the paint supplied into the head 3, the paint is easily attached to the grounded object to be painted. In this case, the atomized paint is directed by the exhaust air of the air motor 4 discharged through the outer peripheral surface side of the bell-shaped head 3 so that the paint can be smoothly applied.

A cleaning agent supply source 34 for supplying a cleaning agent to the cleaning passage 14 is connected to the base end of the circular pipe 14b of the cleaning passage 14 through a single passage 50. The cleaning agent supply source 34 has a thinner supply section 34a for supplying thinner as a cleaning agent and a compressed air supply section 34b for supplying compressed air as a cleaning agent.
The thinner supply unit 34a and the compressed air supply unit 34b
Is configured so that connection / disconnection with respect to the passage 50 can be appropriately switched by a switching valve (not shown).
4a and the compressed air supply section 34b and the thinner and compressed air supplied through the cleaning passage 14 to the concentric pipes 11a to 14 of the paint passages 11 to 13, respectively.
The tip of a and the inner peripheral surface of the bell-shaped head 3 are cleaned. Further, the passage 50 is provided with each of the paint passages 11 to 11 upstream of the switching valve of each of the paint supply sources 31 to 33.
13 (circular pipes 11b, 13b) are connected to the proximal ends of the circular pipes 14b of the cleaning passage 14 while being connected to the proximal ends of the circular pipes 14b of the cleaning passage 14 through the first to third gates 51 to 53 that can be opened and closed. In the paint passage in which the gate is opened by the thinner and compressed air supplied through the gate when any one of the first to third gates 51 to 53 is opened. Are cleaned from the base end to the tip. Then, the paint passages 11 to 13 and the concentric pipes 11a to 14 of the cleaning passage 14 described above.
a is the center of rotation of the bell-shaped head 3 (axis of the motor shaft 5)
In the bell-shaped head 3, the tips of the concentric pipes 11a to 14a are sequentially elongated in such a manner as to protrude toward the tip end side in the axial direction of the motor shaft 5.

Here, the case of changing the coating color will be described. Coating with white paint through the second paint passage 12 (second combined-use paint passage 42) from the white paint supply portion 32a of the second paint supply source 32. Is changed to the coating with the black paint through the first paint passage 11 (first combined-use paint passage 41) from the black paint supply portion 31c of the first paint supply source 31,
The second trigger 22 is operated to the shut-off side, and the opening of the white paint supply portion 32a to the second paint passage 12 is closed by the switching valve. Then, while switching the switching valve so as to connect the thinner supply unit 34a to the passage 50, the fourth gate 54 is opened and the fourth trigger 24 is operated to the supply side, so that the cleaning liquid is supplied through the cleaning passage 14. The thinner cleans the tip of the concentric tube 12a of the second paint passage 12 and the inner peripheral surface of the bell-shaped head 3. After that, the fourth gate 54 is closed and the fourth trigger 24
To the shut-off side, the switching valve of the black paint supply section 31c is opened to the base end of the first paint passage 11, and then the first trigger 21 is operated to the supply side. Supply through the passage 11 into the bell-shaped head 3,
The paint color is changed from white paint to black paint.

Further, the coating of black paint from the black paint supply portion 31c of the first paint supply source 31 via the first paint passage 11 is performed by the blue paint supply portion 31a of the first paint supply source 31.
When changing to coating with blue paint through the first paint passage 11 from, the first trigger 21 is operated to the shut-off side, and the opening of the black paint supply part 31c to the first paint passage 11 is closed by the switching valve. Then, compressed air supply unit 3
The switching valve is switched so that 4b is connected to the passage 50. Then, by opening the first gate 51 and operating the first trigger 21 toward the supply side, the black paint remaining in the first paint passage 11 is compressed by the compressed air supplied through the cleaning passage 14. Extrude. Next, while switching the switching valve so that the thinner supply source 34 is connected to the passage 50, the fourth gate 54 is opened and the fourth trigger 2 is opened.
By operating 4 to the supply side, the inside of the first paint passage 11 is washed from the base end of the circular pipe 11b to the tip of the concentric pipe 11a, and the first paint is applied by the thinner supplied through the washing passage 14. The tip of the concentric tube 11a of the passage 11 and the inner peripheral surface of the bell-shaped head 3 are cleaned. Then, the first and fourth gates 51 and 54 are closed together and the first and fourth gates 51 and 54 are closed.
Both the fourth triggers 21 and 24 are operated to the blocking side. After that, the switching valve of the blue paint supply section 31a is set to the first paint passage 11
After opening to the base end of the, the first trigger 21 is operated to the supply side to supply the blue paint into the bell-shaped head 3 through the first paint passage 11 to change the black paint to the blue paint. I am trying to change the paint color.

In this way, the tips are respectively opened in the bell-shaped head 3 concentrically in the radial direction with respect to the axis of the motor shaft 5 which coincides with the center of rotation of the bell-shaped head 3. The paint passages 11 to 13 and the washing passage 14 are used when changing the paint color other than the similar color.
It suffices to clean only the tips of the to 13 and the inner peripheral surface of the bell-shaped head 3, and it is necessary to clean the inside of the paint passages 11 to 13 with compressed air and thinner only when changing the paint color with a similar color. Therefore, it is not necessary to wash the inside of the paint passages 11 to 13 with a cleaning agent every time the paint color is changed regardless of the similar colors.
The paint in 3 can be retained without being discarded, so that the loss of paint can be reduced.

Further, when the coating color other than the similar color is changed as described above, only the tips of the respective paint passages 11 to 13 and the bell-shaped head 3 are used.
Since it is only necessary to clean the inner peripheral surface of the product, it is not necessary to clean the interior of the paint passage from the base end to the tip when changing the paint color other than similar colors, and a small amount of the cleanser is needed. You can keep it to the limit.

Moreover, the dual-purpose paint passages 41 to 43 (each of the paint passages 11 to 13) of the same color are cleaned by the passage 50 connected to the base end of the dual-use paint passages 41 to 43. Therefore, the dual purpose paint passage 41
The interior of the dual-purpose paint passages 41 to 43 is washed from the proximal end to the distal end only when the coating color is changed to a similar color by
Since this cleaning is of a similar color, it can be easily performed with a single cleaning using compressed air and thinner. The cleaning agent can be effectively saved as compared with the case where the cleaning must be repeated three times, and the cleaning time of the dual-purpose paint passages 41 to 43 at the time of changing the coating color can be greatly saved.

Further, since the tips of the cleaning passage 14 and the paint passages 11 to 13 located at the outermost position in the radial direction are formed to be long in order from the rotation center of the bell-shaped head 3, the shortest cleaning is performed. With the thinner supplied from the tip of the passage 14, the inner peripheral surface of the bell-shaped head 3 can be effectively cleaned, and the tips of the paint passages 11 to 13 which are sequentially lengthened can be set to the rotation center of the bell-shaped head 3. Can be effectively washed towards.

The present invention is not limited to the above embodiments, but includes various other modifications.
For example, in the above embodiment, the three paint passages 11 to 13 and the cleaning passage 14 are arranged concentrically in the radial direction with respect to the shaft core of the motor shaft 5, but three or more paint passages are provided on the motor shaft. It goes without saying that the paint passages may be arranged so as to be concentrically arranged radially outward with respect to the shaft core so that the paint passages are not commonly used for paints of the same color.

Further, in the above embodiment, the paint passages 11 to 11 are provided.
Combined paint passages 41 to 13 in which all 13 are combined with paints of similar colors
Although 43 is used, one or two paint passages may be formed as a dual-purpose paint passage that is made of paints of the same color.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a rotary atomizing coating device.

FIG. 2 is a schematic configuration diagram schematically showing an overall configuration of a rotary atomization coating device.

[Explanation of symbols]

1 rotary atomization coating equipment 2 casing 3 bell-shaped head 11, 12, 13 Paint passage 14 Washing passage 31, 32, 33 Paint supply source 41, 42, 43 combined use paint passage

Claims (2)

(57) [Claims] 1. A bell-shaped head rotatably supported at the tip of a casing, and a paint passage having a tip open at the inner peripheral surface side of the bell-shaped head and a base end connected to a paint supply source. In the rotary atomizing coating device, the paint supplied from the paint supply source through the paint passage into the bell-shaped head is atomized by the rotation of the bell-shaped head to coat an object to be coated. On the peripheral surface side, a plurality of paint passages for different paint colors are arranged in a nested manner so as to be located radially outwardly and concentrically with respect to the center of rotation of the bell-shaped head, and the inner peripheral surface of the tip and bell-shaped head of the respective paint passage cleaning path to clean the cleaning agent is disposed so as to be positioned coaxially with respect to the rotational center of the bell-shaped head open, above paint passage At least one of It is,
The base ends are connected to paint sources of similar colors
In addition to being formed in a dual-purpose paint passage that is organized in a system color,
So that the cleaning passage cleans the one paint passage.
A rotary atomizing coating device, which is also connected to the base end of the one paint passage . 2. The cleaning passage is provided outside the respective paint passages, and the cleaning passage and the respective paint passages are arranged in the order of being closer to the center of rotation of the bell-shaped head. 2. The rotary atomizing coating device according to claim 1, wherein the tip is formed in the bell-shaped head in such a manner that the tip of the bell-shaped head protrudes a lot toward the tip side in the axial direction of the bell-shaped head.