JP6973356B2 - Bell type painting device - Google Patents

Description

The present invention relates to a bell-shaped coating apparatus.

Conventionally, in the intermediate coating and top coating lines for painting a vehicle body, a bell-shaped coating device (hereinafter, also simply referred to as “painting device”) equipped with a bell that rotates at high speed has been used. This painting device is generally configured to atomize paint by rotating a bell cup having a cup shape and apply it to a painted surface of a vehicle body.

An example of such a coating apparatus is disclosed in Patent Document 1 below. The coating apparatus disclosed in Patent Document 1 atomizes the paint by rotating the bell cup constituting the rotary atomizing head, and at the same time, electrostatically transfers the paint charged by the applied voltage to the grounded object to be coated. It is configured to be applied to this object to be coated by utilizing the force of the object. Further, by injecting air from the outer periphery of the bell cup toward the object to be coated, the paint is prevented from spreading too much in the centrifugal direction, and the paint is uniformly applied to the object to be coated.

Japanese Unexamined Patent Publication No. 2008-080240

By the way, in this kind of coating apparatus, it is known that both the ejection capacity and the coating efficiency of the paint generally depend on the ejection diameter of the bell cup.

That is, as the diameter of the bell cup is increased and the discharge port diameter is increased, the centrifugal force capable of atomizing the paint increases, so that the discharge capacity of the paint can be increased. However, when the centrifugal force acting on the paint increases due to the increase in the diameter of the bell cup, the amount of paint scattered outward in the radial direction of the bell cup increases, so that the coating efficiency of the paint, that is, the amount of paint used The ratio of the amount of applied paint decreases.

On the other hand, if the diameter of the bell cup is reduced to a smaller diameter, the centrifugal force acting on the paint is reduced and the amount of paint scattered outward in the radial direction of the bell cup is reduced, so that the coating efficiency of the paint is increased. .. On the other hand, it is necessary to suppress the ejection capacity until the paint is in a desired high atomization state due to the decrease in the centrifugal force acting on the paint.

As described above, it is advantageous to increase the diameter of the bell cup to increase the discharge port diameter in order to increase the paint ejection capacity, but to increase the coating efficiency of the paint, it is advantageous to reduce the diameter of the bell cup and eject it. It is advantageous to reduce the caliber.

Therefore, for example, after reducing the discharge port diameter by using a small-diameter bell cup with high paint application efficiency, a painting device equipped with a plurality of these small-diameter bell cups can be used, or painting with a small-diameter bell cup can be used. Although measures such as increasing the number of devices can be considered, such measures are not preferable because they can cause an increase in the size and cost of the devices.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a bell-shaped coating apparatus capable of achieving both improvement in paint ejection capacity and improvement in coating efficiency.

One aspect of the present invention is
A bell-shaped painting device that paints workpieces.
A bell head that rotates around the axis of rotation,
A discharge path for discharging paint and
Equipped with
The bell head portion includes a first bell cup and a second bell cup arranged with a gap between the first bell cups, and the discharge port diameter at the opening edge of the second bell cup is the first bell. It is configured to exceed the discharge diameter at the opening edge of the cup.
The discharge path portion includes a paint supply pipe extending along the rotation axis, a first flow path through which paint flows from the paint supply pipe to the opening edge of the first bell cup, and a gap from the paint supply pipe. A bell-shaped coating device, comprising a second flow path through which paint flows to the opening edge of the second bell cup.
It is in.

According to the above-mentioned bell-shaped coating apparatus, the paint can be supplied to the work through the discharge path portion in a state where the bell head portion is rotated about the rotation axis. This bell head portion has a hybrid type structure in which a second bell cup having a discharge port diameter larger than the discharge port diameter of the first bell cup is arranged in the first bell cup with a gap.

In the discharge path portion, the first flow path communicates from the paint supply pipe to the opening edge portion of the first bell cup. Therefore, the paint that has flowed through the first flow path to the opening edge of the first bell cup is discharged from the opening edge in a atomized state.

On the other hand, the second flow path communicates from the paint supply pipe shared with the first flow path to the opening edge of the second bell cup through the gap between the first bell cup and the second bell cup. Therefore, the paint that has flowed through the second flow path to the opening edge of the second bell cup is discharged from the opening edge of the second bell cup in a atomized state.

Here, the discharge port diameter at the opening edge portion of the second bell cup is larger than the discharge port diameter at the opening edge portion of the first bell cup. That is, the bell head portion is configured to discharge the paint through at least two bell cups that are coaxial and have different discharge diameters.

As a result, on the first bell cup side, the amount of paint scattered outward in the radial direction of the first bell cup can be reduced by reducing the centrifugal force acting on the paint by making the discharge diameter relatively small. can. Therefore, the first bell cup has an advantage that the coating efficiency expressed as the ratio of the amount of the applied paint to the amount of the used paint can be increased.

Further, on the second bell cup side, the ability to atomize the paint can be enhanced by increasing the centrifugal force acting on the paint by relatively increasing the discharge diameter. Therefore, the second bell cup has an advantage that the discharge capacity of the paint can be increased.

Therefore, the bell head portion has the advantages of the first bell cup and the second bell cup. For example, when compared with an existing coating apparatus having only a bell cup corresponding to the first bell cup, it is possible to increase the amount of paint discharged by adding the second bell cup. Further, when compared with the existing coating apparatus having only the bell cup corresponding to the second bell cup, the addition of the first bell cup makes it possible to increase the coating efficiency of the paint. Further, it is advantageous for any of the existing coating devices in that the coating quality can be improved because the fine particles of the paint can be made high when the discharge amount is the same.

As described above, according to the above aspect, it is possible to provide a bell-shaped coating apparatus capable of achieving both improvement in paint ejection capacity and improvement in coating efficiency.

The cross-sectional view which shows the whole structure of the bell type coating apparatus of Embodiment 1. FIG. The figure which looked at the bell head part in FIG. 1 from the direction of arrow A. An enlarged view of the B region of FIG. An enlarged view of the C region of FIG. FIG. 5 is a cross-sectional view showing the overall configuration of the bell-shaped coating apparatus according to the second embodiment.

A preferred embodiment of the above embodiment will be described.

In the bell-shaped coating apparatus, the bell head portion includes a bell hub provided inside the first bell cup in the radial direction, and the paint supply pipe is located on the front side in the axial direction from the inlet of the gap. In addition, the first flow path is provided with an injection port arranged so as to face the back surface of the bell hub, and a part of the paint sprayed from the injection port of the paint supply pipe is along the back surface of the bell hub. The second flow path is a flow path that flows outward in the radial direction, and in the second flow path, the rest of the paint sprayed from the injection port of the paint supply pipe branches from the first flow path and is directed toward the inflow port. It is preferable that the flow path flows backward in the axial direction.

According to this bell-shaped coating device, in the first flow path of the discharge path portion, a part of the paint sprayed from the injection port of the paint supply pipe flows outward along the back surface of the bell hub in the radial direction. On the other hand, in the second flow path of the discharge path portion, the remaining portion of the paint sprayed from the injection port of the paint supply pipe branches from the first flow path, flows rearward in the axial direction, and flows into the inflow port of the gap. In this case, paint is applied to each of the first flow path and the second flow path from the common paint supply pipe by a simple structure utilizing the relative arrangement relationship between the injection port of the paint supply pipe and the inflow port of the gap. Can be split.

In the bell-shaped coating apparatus, the bell head portion includes a bell hub provided inside the first bell cup in the radial direction, and the paint supply pipe is located on the front side in the axial direction from the inlet of the gap. The first is provided with an injection port arranged so as to face the back surface of the bell hub and an outlet arranged so as to face the inflow port on the rear side in the axial direction from the injection port. The flow path is a flow path in which the paint sprayed from the injection port of the paint supply pipe flows outward along the back surface of the bell hub, and the second flow path is the flow path of the paint supply pipe. It is preferable that the paint flowing out from the outlet is a flow path that flows outward in the radial direction toward the inlet.

According to this bell-shaped coating device, in the first flow path of the discharge path portion, the paint sprayed from the injection port of the paint supply pipe flows outward along the back surface of the bell hub in the radial direction. On the other hand, in the second flow path of the discharge path portion, the paint flowing out from the outlet of the paint supply pipe flows outward in the radial direction and flows into the inlet. In this case, by using the injection port and the outflow port provided in the paint supply pipe, the paint can be diverted from the common paint supply pipe to each of the first flow path and the second flow path.

In the bell-shaped coating apparatus, the bell head portion is configured such that the opening edge portion of the second bell cup is offset to the rear side in the axial direction with respect to the opening edge portion of the first bell cup. It is preferable to have.

According to this bell-shaped coating device, the opening edge of the first bell cup is compared with the case where the offset dimension between the first bell cup and the second bell cup is 0 (zero) or below a predetermined threshold value. The paint once atomized at the portion and the paint once atomized at the opening edge of the second bell cup are less likely to collide with each other. As a result, it is possible to prevent problems such as recombination of the paints discharged from at least two ejection ports to increase the particle size and mixing of air bubbles in these paints.

Hereinafter, embodiments of the bell-shaped coating apparatus will be described with reference to the drawings.

In the drawings for explaining the bell-shaped coating apparatus, the axial direction of the bell head portion is indicated by an arrow X, and the radial direction of the bell head portion is indicated by an arrow Y. Further, the direction in which the bell head portion faces the work in the axial direction is defined as "forward", and the opposite direction is defined as "rear".

(Embodiment 1)
As shown in FIG. 1, the bell-shaped coating device (hereinafter, simply referred to as “painting device”) 1 is a device for painting a work W to be painted. Examples of the work W include a vehicle body that is carried into a painting booth and painted in an intermediate coating and a top coating line. The painting device 1 is attached to the robot arm of the painting robot, and is arranged toward the surface to be painted Wa of the work W by moving the robot arm according to a movement locus instructed in advance during painting work.

The coating apparatus 1 includes a bell head portion 10 that rotates about a rotation axis L extending in the axial direction X, and a discharge path portion 20 provided on the bell head portion 10 so that the paint P can be discharged toward the work W. ing.

The bell head portion 10 is housed in the housing 2 together with a drive portion such as an air motor 5 that rotationally drives the bell head portion 10. The bell head portion 10 has a function of atomizing the paint P (also referred to as “atomization”) by rotation, and is also referred to as a “rotary atomizing head”. The bell head portion 10 is energized through an electric cable 9 connected to an external power source.

An air supply path 4 communicating with the air supply source 3 is provided at a portion close to the outer surface of the housing 2. The air flowing in from the inflow port 4a of the air supply path 4 is used for the air blown out from the air outlet 4b, so-called "shaping air". This shaping air functions to prevent the paint from spreading too much in the centrifugal direction. A plurality of air outlets 4b of the air supply path 4 are provided at equal intervals along the circumferential direction of the housing 2.

The bearing air used for the thrust direction air bearing of the air motor 5 and the radial direction air bearing, and the driving air for driving the air motor 5 are supplied through a path different from the air supply path 4. It has become so.

The air motor 5 is an air-driven motor, and is configured as an actuator that rotationally drives the bell head portion 10. The air motor 5 has a drive shaft 5a extending along the rotation axis L, and the drive shaft 5a constitutes a rotation center portion of the air motor 5. The rotation speed at the time of starting, stopping, and operating the air motor 5 is controlled by the control unit 30.

The drive shaft 5a of the air motor 5 is fixed to the bell head portion 10 and integrated with the turbine 6. A plurality of blades 6a arranged at equal intervals in the circumferential direction are provided on the outer peripheral surface of the turbine 6. Therefore, when air is supplied to the plurality of blades 6a of the turbine 6, the drive shaft 5a of the air motor 5 rotates, whereby the bell head portion 10 rotates about the rotation axis L.

For details of the turbine 6 constituting the air motor 5, for example, "Turbine 5" disclosed in Japanese Patent Application Laid-Open No. 60-151555 is referred to. Therefore, in the present specification, further detailed description of the turbine 6 will be omitted by reference to this publication.

The drive shaft 5a of the air motor 5 has a built-in paint supply pipe 8 extending along the rotation axis L of the bell head portion 10. The paint supply pipe 8 is arranged so as to penetrate the bell head portion 10 and its injection port 8a faces the facing space S between the first bell cup 11 and the back surface 13a of the bell hub 13. Specifically, in the paint supply pipe 8, the front end portion in the axial direction X penetrates the through hole 12c in the central portion of the second bell cup 12, and is inserted into the through hole 11c in the central portion of the first bell cup 11. ing. Therefore, the paint P supplied from the paint supply source pipe 7 flows forward in the axial direction X in the pipe of the paint supply pipe 8 and then is sprayed from the injection port 8a toward the facing space S. ing.

As shown in FIGS. 1 and 2, the bell head portion 10 includes a first bell cup 11, a second bell cup 12, and a bell hub 13. The first bell cup 11 and the second bell cup 12 are both cup-shaped (also referred to as "concave" or "bowl") like a cup. The second bell cup 12 is placed over the first bell cup 11 and integrated with each other. Then, a gap G in the radial direction Y is formed between the first bell cup 11 and the second bell cup 12.

Here, the gap G is a space through which the paint P can flow, and in the present embodiment, a plurality of flow holes arranged at equal intervals in the circumferential direction between the first bell cup 11 and the second bell cup 12. It is composed of.

The first bell cup 11 has an opening edge portion 11a, and is configured such that the inner diameter gradually increases toward the front in the axial direction X and the inner diameter becomes maximum at the opening edge portion 11a. Like the first bell cup 11, the second bell cup 12 has an opening edge portion 12a, and the inner diameter gradually increases toward the front in the axial direction X so that the inner diameter becomes maximum at the opening edge portion 12a. It is configured.

In the bell head portion 10, the second bell cup 12 is configured to be a bell cup having a larger diameter than the first bell cup 11. That is, the discharge port diameter (discharge port diameter d2 in FIG. 2) at the opening edge portion 12a of the second bell cup 12 exceeds the discharge port diameter (discharge port diameter d1 in FIG. 2) at the opening edge portion 11a of the first bell cup 11. It has become.

In the present embodiment, the opening edge portions 11a and 12a are provided at the foremost ends of the bell cups 11 and 12 in the axial direction X, but instead of the opening edges 11a and 12a, the outermost portions of the bell cups 11 and 12 in the axial direction X are provided. A portion corresponding to the opening edges 11a and 12a may be provided in addition to the front end portion. That is, the opening edges 11a and 12a of the bell cups 11 and 12 may be any portion as long as they can finally atomize and discharge the paint P, and the positions where the opening edges 11a and 12a are provided are the shafts of the bell cups 11 and 12. It is not limited to the front end portion of the direction X.

In the bell head portion 10, the first bell cup 11 is arranged inside the second bell cup 12, and the second bell cup 12 is arranged outside the first bell cup 11. Therefore, the first bell cup 11 may be referred to as an "inner bell cup" or "inner bell", and the second bell cup 12 may be referred to as an "outer bell cup" or "outer bell".

The bell hub 13 has a disk shape, is provided inside the radial direction Y of the first bell cup 11, and is fixed to the first bell cup 11. The back surface 13a on the rear side of the bell hub 13 in the axial direction X is a curved surface recessed from the central portion to the outer peripheral portion. A plurality of through holes 13b that penetrate the bell hub 13 in the axial direction X are provided in an annular shape on the outer peripheral portion of the bell hub 13. These plurality of through holes 13b constitute an outlet opening 14 capable of guiding the paint P from the back surface 13a side of the bell hub 13 to the work W side.

As shown in FIG. 2, an annular discharge opening 15 is provided between the opening edge portion 11a of the first bell cup 11 and the opening edge portion 12a of the second bell cup 12. The discharge opening 15 is an outlet opening of a gap G between the first bell cup 11 and the second bell cup 12.

As shown in FIG. 1, the discharge path portion 20 is for discharging the paint P, and the paint is applied from the paint supply pipe 8 and the paint supply pipe 8 to the opening edge portion 11a of the first bell cup 11. It includes a first flow path 21 through which P flows, and a second flow path 22 through which the paint P flows from the paint supply pipe 8 to the opening edge portion 12a of the second bell cup 12.

The first flow path 21 is a flow path utilizing the facing space S between the first bell cup 11 and the back surface 13a of the bell hub 13. The second flow path 22 is composed of a gap G composed of a plurality of flow holes formed between the first bell cup 11 and the second bell cup 12.

Instead of forming the gap G constituting the second flow path 22 by a plurality of flow holes, a conical cylinder is partitioned by the outer peripheral surface of the first bell cup 11 and the inner peripheral surface 12b of the second bell cup 12. It may be formed by the gap space of the body shape. In this case, since the gap G opens over almost the entire circumference, it is possible to keep the resistance when the paint P flows low.

When the bell head portion 10 is energized through the electric cable 9 during the operation of the coating apparatus 1, the paint P flowing through the first flow path 21 and the second flow path 22 of the discharge path portion 20 is charged by the applied voltage. The charged paint P is discharged from each of the outlet opening 14 communicating with the first flow path 21 and the discharge opening 15 communicating with the second flow path 22.

The paint P discharged from the outlet opening 14 in the first flow path 21 forms a liquid film along the inner peripheral surface 11b of the first bell cup 11, and desired fine particles are formed at the opening edge portion 11a of the first bell cup 11. It is discharged in a state of being changed. On the other hand, the paint P having a liquid film formed along the inner peripheral surface 12b of the second bell cup 12 in the second flow path 22 is discharged from the discharge opening 15 at the opening edge portion 12a of the second bell cup 12. Will result in the desired atomization state. The dimension of the gap G constituting the second flow path 22 in the radial direction is set to a value obtained by adding a predetermined gap to the thickness of the liquid film formed along the inner peripheral surface 12b of the second bell cup 12. It is preferable to be done.

Then, the atomized paint P is directed toward the painted surface Wa of the vehicle body W in a constant pattern by the electrostatic force between the grounded work W and the shaping air blown out from the air outlet 4b of the air supply path 4. It is sprayed and applied.

Here, the flow of the paint in each of the first flow path 21 and the second flow path 22 of the discharge path portion 20 will be described with reference to FIGS. 1 and 3.

As shown in FIG. 3, in the discharge path portion 20, the paint supply pipe 8 is located on the front side in the axial direction X from the inflow port 22a of the gap G and is arranged so as to face the back surface 13a of the bell hub 13. It is provided with an injection port 8a. At this time, the injection port 8a of the paint supply pipe 8 is arranged toward the facing space S between the first bell cup 11 and the back surface 13a of the bell hub 13.

Here, in the first flow path 21 of the discharge path portion 20, a part of the paint P sprayed from the jet port 8a of the paint supply pipe 8 has a plurality of through holes in the facing space S along the back surface 13a of the bell hub 13. It is a flow path that flows outward in the radial direction toward 13b. Therefore, a part of the paint P flows toward the plurality of through holes 13b. At this time, since the paint supply pipe 8 penetrates the bell head portion 10 in the axial direction X, the paint P sprayed from the injection port 8a of the paint supply pipe 8 is centrifugally directed (diameter) along the back surface 13a of the bell hub 13. It can flow in a well-balanced manner (outside the direction Y). After that, the paint P that has passed through each of the plurality of through holes 13b flows through the first bell cup 11 along the inner peripheral surface 11b to the opening edge portion 11a (see FIG. 1). In FIG. 3, the flow of the paint P in the first flow path 21 is indicated by “Fa”.

On the other hand, in the second flow path 22 of the discharge path portion 20, the remaining portion of the paint P sprayed from the injection port 8a of the paint supply pipe 8 overflows, so that the facing space S is directed toward the inflow port 22a behind the axial direction X. It is a flow path. At this time, the remaining portion of the paint P branches from the first flow path 21 and makes a gap between the outer surface of the paint supply pipe 8 and the through hole 11c of the first bell cup 11 toward the inflow port 22a in the axial direction X. Flows behind. Therefore, the remaining portion of the paint P flows into the inflow port 22a of the gap G. After that, the paint P flowing into the gap G from the inflow port 22a flows through the second bell cup 12 along the inner peripheral surface 12b to the opening edge portion 12a (see FIG. 1). In FIG. 3, the flow of the paint P in the second flow path 22 is indicated by “Fb”.

In the facing space S, the overflow portion of the paint P that cannot flow toward the plurality of through holes 13b is reflected on the back surface 13a of the bell hub 13 in the direction opposite to the inflow direction at the injection port 8a and flows. Therefore, as the flow rate of the paint P flowing through the paint supply pipe 8 increases, the flow rate of the paint P flowing into the second flow path 22 also increases accordingly.

In this case, a simple structure utilizing the relative arrangement relationship between the injection port 8a of the paint supply pipe 8 and the inflow port 22a of the gap G allows the common paint supply pipe 8 to the first flow path 21 and the second flow path 21 and the second. The paint P can be diverted into each of the flow paths 22.

As shown in FIG. 4, the bell head portion 10 is configured such that the opening edge portion 12a of the second bell cup 12 is offset to the rear side of the axial direction X with respect to the opening edge portion 11a of the first bell cup 11. Has been done. That is, the second bell cup 12 is arranged at an offset position on the rear side of the axial direction X with respect to the first bell cup 11. This configuration can also be said to be "the opening edge portion 11a of the first bell cup 11 is offset to the front side in the axial direction X with respect to the opening edge portion 12a of the second bell cup 12.". In FIG. 4, the offset dimension between the first bell cup 11 and the second bell cup 12 is indicated by “d3”.

According to this configuration, as compared with the case where the offset dimension d3 is 0 (zero) or below a predetermined threshold value, the paint P once atomized at the opening edge portion 11a of the first bell cup 11 (in FIG. 4). The paint P1) and the paint P (paint P2 in FIG. 4) once atomized at the opening edge portion 12a of the second bell cup 12 are less likely to collide with each other. This prevents problems such as recombination of the paints P1 and P2 discharged from the two ejection ports to increase the particle size and mixing of air bubbles in the paints P1 and P2. be able to.

According to the above-mentioned first embodiment, the following effects can be obtained.

According to the above-mentioned coating apparatus 1, the paint can be supplied to the work W through the discharge path portion 20 in a state where the bell head portion 10 is rotated about the rotation axis L. The bell head portion 10 has a hybrid type structure in which the second bell cup 12 having a discharge port diameter d2 larger than the discharge port diameter d1 of the first bell cup 11 is arranged in the first bell cup 11 with a gap G interposed therebetween. Have.

In the discharge path portion 20, the first flow path 21 communicates from the paint supply pipe 8 to the opening edge portion 11a of the first bell cup 11. Therefore, the paint P that has flowed through the first flow path 21 to the opening edge portion 11a of the first bell cup 11 is discharged from the opening edge portion 11a in a atomized state.

On the other hand, the second flow path 22 is the opening edge portion of the second bell cup 12 through the gap G between the first bell cup 11 and the second bell cup 12 from the paint supply pipe 8 shared with the first flow path 21. It communicates up to 12a. Therefore, the paint P that has flowed through the second flow path 22 to the opening edge portion 12a of the second bell cup 12 is discharged from the opening edge portion 12a of the second bell cup 12 in a atomized state.

Here, the discharge port diameter d2 at the opening edge portion 12a of the second bell cup 12 is larger than the discharge port diameter d1 at the opening edge portion 11a of the first bell cup 11. That is, the bell head portion 10 is configured to discharge the paint P via two bell cups 11 and 12 that are coaxial and have different discharge diameters.

As a result, on the first bell cup 11 side, the amount of the paint P scattered outward in the radial direction Y of the first bell cup 11 by reducing the centrifugal force acting on the paint P by making the discharge diameter relatively small. Can be reduced. Therefore, the first bell cup 11 has an advantage that the coating efficiency can be improved.

The "coating efficiency" here indicates the ratio (= E2 / E1) of the amount E1 of the paint used for painting and the amount E2 of the paint actually applied to the surface to be coated Wa of the work W. .. Therefore, the coating efficiency is low when the amount E2 of the paint is relatively small, and the coating efficiency is high when the amount E2 of the paint is relatively large.

Further, on the second bell cup 12 side, the ability to atomize the paint P can be enhanced by increasing the centrifugal force acting on the paint P by relatively increasing the discharge diameter. Therefore, the second bell cup 12 has an advantage that the ejection capacity of the paint P can be increased.

Therefore, the bell head portion has the advantages of the first bell cup 11 and the second bell cup 12. For example, when compared with an existing coating apparatus having only a bell cup corresponding to the first bell cup 11, the addition of the second bell cup 12 makes it possible to increase the discharge amount of the paint P. Further, when compared with the existing coating apparatus having only the bell cup corresponding to the second bell cup 12, the addition of the first bell cup 11 makes it possible to increase the coating efficiency of the paint P. .. Further, for any of the existing coating devices, when the discharge amount is the same, it is possible to increase the fine particles of the coating material P, which is advantageous in that the coating quality can be improved.

According to the above-described first embodiment, it is possible to provide the coating apparatus 1 capable of achieving both the improvement of the ejection capacity of the coating material P and the improvement of the coating efficiency.

As a modification particularly related to the above-described first embodiment, a part of the paint sprayed from the jet port 8a of the paint supply pipe 8 flows through the second flow path 22, while the paint is jetted from the jet port 8a of the paint supply pipe 8. It is also possible to adopt a structure in which the remaining portion of the applied paint branches from the second flow path 22 and flows through the first flow path 21.

Hereinafter, other embodiments related to the above-described first embodiment will be described with reference to the drawings. In other embodiments, the same elements as those in the first embodiment are designated by the same reference numerals, and the description of the same elements will be omitted.

(Embodiment 2)
As shown in FIG. 5, in the coating apparatus 101 of the second embodiment, the structure of the bell head portion 110 is different from that of the bell head portion 10 of the coating apparatus 1 of the first embodiment. In addition to the injection port 8a, the paint supply pipe 8 of the bell head portion 110 includes an outlet 8b arranged so as to face the inflow port 22a on the rear side of the injection port 8a in the axial direction X. A plurality of the outlets 8b are provided in the circumferential direction of the paint supply pipe 8.

In the coating device 101, in the first flow path 21 of the discharge path portion 20, the paint P sprayed from the injection port 8a of the paint supply pipe 8 flows outward in the radial direction Y along the back surface 13a of the bell hub 13. It's a road. Further, the second flow path 22 of the discharge path portion 20 is a flow path in which the paint P flowing out from the plurality of outlets 8b of the paint supply pipe 8 flows outward in the radial direction toward the inflow port 22a.

Other configurations are the same as those in the first embodiment.

According to the coating device 101, in the first flow path 21 of the discharge path portion 20, the paint P sprayed from the injection port 8a of the paint supply pipe 8 is radially outward along the back surface 13a of the bell hub 13. It flows. On the other hand, in the second flow path 22 of the discharge path portion 20, the paint P flowing out from the plurality of outlets 8b of the paint supply pipe 8 flows outward in the radial direction Y and flows into the inflow port 22a.

As a result, the paint P flowing in the paint supply pipe 8 is divided into a paint P jetted from the injection port 8a and a paint P flowing out from the plurality of outlets 8b. Therefore, by appropriately selecting the area ratio between the area of the injection port 8a and the combined area of the plurality of outlets 8b, the paint P sprayed from the injection port 8a and the paint sprayed from the plurality of outlets 8b It becomes possible to change the flow rate balance with P.

In this case, the paint P is diverted from the common paint supply pipe 8 to each of the first flow path 21 and the second flow path 22 by using the injection port 8a and the outflow port 8b provided in the paint supply pipe 8. Can be done.

Other than that, it has the same effect as that of the first embodiment.

The present invention is not limited to the above-described embodiment, and various applications and modifications can be considered as long as the object of the present invention is not deviated. For example, the following embodiments to which the above-described embodiments are applied can also be implemented.

In the above-described embodiment, the case where two bell cups 11 and 12 having different discharge ports are provided in the bell head portions 10 and 110 has been illustrated, but instead of this, one or a plurality of different bell cups 11 and 12 are provided. A structure with an added bell cup can also be adopted. That is, the number of bell cups can be set to two or more. In this case, if the other bell cup is coaxial with the two bell cups 11 and 12, the discharge port diameter at the opening edge may be the same as or different from that of the two bell cups 11 and 12. May be good.

In the above-described embodiment, the case where the opening edge portion 12a of the second bell cup 12 is offset to the rear side in the axial direction X with respect to the opening edge portion 11a of the first bell cup 11 in the bell head portion 10 has been exemplified. If it is possible to keep the particle size of the paint P to be applied to the work W within a desired range, such an offset structure can be omitted.

In the above-described embodiment, the painting devices 1, 101 for painting the vehicle body as the work W have been exemplified, but these painting devices 1, 101 may be used for painting the work W other than the vehicle body as needed. can.

1,101 Bell-shaped painting device (painting device)
8 Paint supply pipe 8a Injection port 8b Outlet 10,110 Bell head part 11 1st bell cup 11a Opening edge 12 2nd bell cup 12a Opening edge 13 Bell hub 13a Back side 20 Discharge path 21 1st flow path 22 2nd flow Road 22a Inlet d1, d2 Discharge port diameter G Gap L Rotating axis P, P1, P2 Paint W Work X Axial direction Y radial direction

Claims (4)

A bell-shaped painting device that paints workpieces.
A bell head that rotates around the axis of rotation,
A discharge path for discharging paint and
Equipped with
The bell head portion includes a first bell cup and a second bell cup arranged with a gap between the first bell cups, and the discharge port diameter at the opening edge of the second bell cup is the first bell. It is configured to exceed the discharge diameter at the opening edge of the cup.
The discharge path portion includes a paint supply pipe extending along the rotation axis, a first flow path through which paint flows from the paint supply pipe to the opening edge of the first bell cup, and a gap from the paint supply pipe. A bell-shaped coating apparatus comprising a second flow path through which paint flows to the opening edge of the second bell cup. The bell head portion includes a bell hub provided inside the first bell cup in the radial direction, and the paint supply pipe is located on the front side in the axial direction from the inlet of the gap and faces the back surface of the bell hub. In the first flow path, a part of the paint sprayed from the jet port of the paint supply pipe flows outward along the back surface of the bell hub. The second flow path is a flow in which the balance of the paint sprayed from the injection port of the paint supply pipe branches from the first flow path and flows backward in the axial direction toward the inflow port. The bell-shaped coating apparatus according to claim 1, which is a road. The bell head portion includes a bell hub provided inside the first bell cup in the radial direction, and the paint supply pipe is located on the front side in the axial direction from the inlet of the gap and faces the back surface of the bell hub. The first flow path is provided with an injection port arranged so as to face the inlet and an outlet arranged so as to face the inlet on the rear side in the axial direction from the injection port, and the first flow path is the paint supply pipe. The paint sprayed from the jet port is a flow path that flows outward in the radial direction along the back surface of the bell hub, and the second flow path is a flow path in which the paint flowing out from the outlet of the paint supply pipe is used. The bell-shaped coating apparatus according to claim 1, which is a flow path that flows outward in the radial direction toward the inlet. The bell head portion is configured such that the opening edge portion of the second bell cup is offset to the rear side in the axial direction with respect to the opening edge portion of the first bell cup. The bell-shaped coating apparatus according to any one of the above.

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