JP2012152660A - Rotary spray coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary spray coating device capable of suppressing scattering of misty coating material.SOLUTION: The rotary spray coating device 1 is composed of a body 2 and forcible air supply devices 3, 4. The body 2 has a disk-like rotor 10, a plurality of rods 11, a plurality of spray nozzles 12, a shaft 13, and a motor 14. An edge of each rod 11 is mounted with the spray nozzle 12 directed downward. The spray nozzle 12 can atomize and spray the coating material downward. The forcible air supply devices 3, 4 can spray a plurality of linear airflows, and can supply beam-like pinpoint airflows. The forcible air supply devices 3, 4 include blowers 7. The forcible air supply devices 3, 4 are positioned above the spray nozzles 12 and can spray a plurality of linear airflows to the same direction as the spray direction of the coating material of the spray nozzle 12 so as to spray the airflows like a shower.

Description

  The present invention relates to a rotary spray coating apparatus, and more particularly to a rotary spray coating apparatus capable of coating a large amount of products in a short time in combination with a conveyor or the like.

  A rotary spray coating apparatus is known as an apparatus for coating a large amount of products in a short time. A rotary spray coating device is equipped with a plurality of spray nozzles. By rotating each spray nozzle along a circumferential path, for example, a large amount of product flowing at a constant speed on a conveyor can be coated with uneven coating. It is possible to form a uniform painted surface without any defects in a short time. However, many of the conventional rotary spray coating devices mainly apply only with one circumferential track, and unless the spray nozzle is rotated at a high speed, it cannot catch up with the product flowing on the conveyor and cannot secure the required coating amount. It was. Therefore, the flow of the sprayed mist paint includes a high-speed swirling component due to the high-speed rotation, and the amount of sprayed mist paint other than the object increases. As a result, the spray loss of the mist-like paint was large at high speed rotation.

  Patent Document 1 discloses a rotary spray coating apparatus capable of suppressing the scattering loss of mist paint. The rotary spray coating apparatus described in Patent Document 1 can perform coating simultaneously with, for example, an inner circle and an outer circle by providing a plurality of circumferential tracks for rotating the spray nozzle. As a result, a sufficient amount of application can be secured even at low speed rotation, so that the swirl component included in the flow of the mist paint is reduced, and the scattering loss of the mist paint can be reduced.

JP 2000-61364 A

  However, even in the rotary spray coating apparatus described in Patent Document 1, since the swirl component due to rotation is not zero, the mist paint is diffused or scattered. In addition, the sprayed paint can rise and rise, contaminating the spray gun.

  Then, an object of this invention is to provide the rotary spray coating apparatus which can suppress scattering of a mist-like paint.

  The invention according to claim 1 for solving the above-described problem has a plurality of spray nozzles capable of injecting a mist-like paint, and a forced air supply device capable of supplying a plurality of linear airflows. The nozzle rotates along a circumferential path, and the forced air supply device is located above the spray nozzle and allows relative rotation of the spray nozzle. The forced air supply device is connected to the spray nozzle. The rotary spray coating apparatus is characterized in that the flow of mist paint can be rectified by a straight air flow.

  The rotary spray coating apparatus employed in the present invention has a forced air supply device capable of supplying a plurality of linear airflows. The straight airflow refers to, for example, a pinpoint airflow. Further, the forced air supply device allows relative rotation of the spray nozzle. That is, the forced air supply device does not rotate, and the airflow supplied from the forced air supply device does not shake. That is, the forced air supply device can straighten the flow of the mist paint from the spray nozzle straight with a plurality of linear airflows. As a result, the swirl component included in the flow of the mist paint can be reduced. Further, by spraying the airflow from above the spray nozzle with the forced air supply device, the rising of the mist paint is also suppressed.

  According to the rotary spray coating apparatus of the present invention, scattering of the mist paint can be suppressed, and further, the rise of the mist paint can be suppressed. Therefore, the mist-like paint is reliably sprayed onto the object, and the coating efficiency of the paint on the object can be improved.

It is a perspective view which shows the rotary spray coating apparatus of this invention. It is a bottom view which shows the bottom face of a forced air supply apparatus. It is a figure which shows the positional relationship of each component of a rotary spray coating apparatus, (a) is a top view, (b) is a side view. It is a side view which shows operation | movement of a rotary spray coating apparatus, (a) is a state in which a spray nozzle is out of the paintable range, (b)-(d) is a left end through the middle from the right end in the spray nozzle within the paintable range. (E) is a state where the spray nozzle is out of the paintable range.

  Hereinafter, embodiments of a rotary spray coating apparatus of the present invention will be described in detail with reference to the drawings. In addition, the following description is for facilitating the understanding of the embodiment, and the present invention should not be understood to be limited thereby.

  A rotary spray coating apparatus 1 shown in FIG. 1 includes a main body 2 and forced air supply apparatuses 3 and 4. A conveyor device 20 is located below the rotary spray coating device 1. The conveyor device 20 is a conventionally known belt conveyor, and includes a belt 21 and rollers 22 and 23. A plurality of workpieces (objects) 30 are placed on the belt 21. When the belt 21 advances in the traveling direction X in accordance with the rotation of the rollers 22 and 23, the workpiece 30 moves in the traveling direction X. It will be carried.

  The main body 2 is a conventionally known rotary spray coating apparatus, and includes a disk-shaped rotor 10, a plurality of rods 11, a plurality of spray nozzles 12, a shaft 13, and a motor 14. Eight rods 11 extend radially from the rotor 10 around the rotor 10. A spray nozzle 12 is attached to the tip of each rod 11 downward. The spray nozzle 12 is capable of spraying downward in the form of a mist of paint. The pipes for injecting paint or gas into the spray nozzle 12 are not shown.

  A shaft 13 is provided on the upper side of the rotor 10 and extends in a direction perpendicular to the rod 11. A motor 14 as a power source is located at the end of the shaft 13. That is, in the main body 2, the rotational force of the motor 14 is transmitted to the rotor 10 via the shaft 13, and the eight rods 11 rotate around the rotor 10. As the rod 11 rotates, the spray nozzle 12 provided at the tip of each rod 11 also rotates. It is preferable that the rotational speed (normally orbital moving speed) of the spray nozzle 12 is about 50 to 200 m / min.

  The forced air supply devices 3 and 4 are box bodies and incorporate a blower 7. As the air blower 7, it is preferable to use a fan or a blower. Or you may utilize the pressure from the compressor which can discharge | emit compressed air. The forced air supply devices 3 and 4 are located above the main body 2. In other words, the forced air supply devices 3 and 4 are located on the side opposite to the spray nozzle 12. That is, the forced air supply devices 3 and 4 themselves do not rotate and allow the relative rotation of the spray nozzle 12.

  As shown in FIG. 2, a plurality of holes 6 are provided in the bottom surfaces 5 of the forced air supply devices 3 and 4. When the air blower 7 is operated, a plurality of linear airflows are supplied from the holes 6 toward the outside from the forced air supply devices 3 and 4. In other words, the forced air supply devices 3 and 4 are capable of supplying a beam-like pinpoint airflow and supply a shower-like airflow. That is, the forced air supply devices 3 and 4 can supply a plurality of linear airflows in the same direction as the spraying direction of the paint from the spray nozzle 12. In place of the plurality of holes 6, a plurality of pipes, a plurality of air nozzles, or the like may be used.

  Next, the positional relationship of each member constituting the rotary spray coating apparatus 1 will be described with reference to FIGS.

  As shown in the plan view of FIG. 3A, each spray nozzle 12 is arranged by dividing the circumferential trajectory R into eight equal parts. That is, each spray nozzle 12 rotates along the circumferential path R. The conveyor device 20 cuts substantially the center of the circumferential track R in a plan view. The forced air supply devices 3 and 4 are in a position overlapping the conveyor device 20 in a plan view, and are disposed to face each other in the traveling direction X.

  The lateral width of the forced air supply devices 3 and 4 (bottom surface 5) is slightly wider than the width of the belt 21 of the conveyor device 20, and the vertical width of the forced air supply devices 3 and 4 (bottom surface 5) is the circumferential track R. Is larger than the diameter of the spray nozzle 12 rotating along the axis.

  On the other hand, as shown in the side view of FIG. 3B, the work 30 is positioned on the belt 21, the spray nozzle 12 is positioned on the work 30, and the forced air supply device 4 ( 3) is located. That is, the spray nozzle 12 can be applied to the work 30 only when it is close to the work 30. This is a paintable range of the so-called spray nozzle 12. The forced air supply device 4 (3) is located over the paintable range. In FIG. 3B, only the spray nozzle 12 positioned on the belt 21 is depicted for convenience of explanation.

  Next, the operation of the rotary spray coating apparatus 1 will be described with reference to FIGS. In addition, illustration of the workpiece | work 30 is abbreviate | omitted in Fig.4 (a)-(e).

  In FIG. 4A, the spray nozzle 12 moves from right to left in the rotation direction Z. This is because the spray nozzle 12 rotates along the circular orbit R in a plan view but moves in the left-right direction in a side view. Note that a shower-like airflow A is supplied downward from the forced air supply device 4 (3).

  4B to 4D, the spray nozzle 12 is located below the forced air supply device 4 (3) and is within the range of the shower-like airflow A. That is, since the spray nozzle 12 is within the paintable range, it continues to spray the mist paint M. That is, the spray nozzle 12 applies the mist paint M from the right end (FIG. 4B) to the left end (FIG. 4D) through the middle (FIG. 4C) of the forced air supply device 4 (3). It proceeds in the rotation direction Z while being injected. And as shown in FIG.4 (e), since the spray nozzle 12 has come out of the range which can be painted, injection of the mist-like paint M stops. That is, in the present embodiment, control is performed so that the mist-like paint M is ejected only when the spray nozzle 12 is within the paintable range.

  As described above, since the spray nozzle 12 advances in the rotation direction Z (from left to right) while spraying the mist paint M, the flow of the mist paint M includes a swirl component in the rotation direction Z. It is. That is, the flow of the mist paint M should flow in the left direction, but in the present embodiment, the shower-like airflow A is supplied downward from the forced air supply device 4 (3). That is, the forced air supply devices 3 and 4 themselves do not rotate and allow the relative rotation of the spray nozzle 12, so that the shower-like airflow A does not blur. As a result, the swirl component contained in the flow of the mist paint M is reduced by being rectified by the shower-like airflow A. That is, the flow of the mist paint M is downward, and the mist paint M is prevented from rising or diffusing.

  Further, for example, when an exhaust fan is provided in the vicinity of the conveyor device 20, if the forced air supply devices 3 and 4 are not provided, the flow of the mist paint M from the spray nozzle 12 is not injected onto the workpiece 30. May be sucked into the exhaust fan as it is, which is also a cause of uneven painting. In this embodiment, since the forced air supply devices 3 and 4 are provided, the mist-like paint M can be reliably sprayed onto the work 30, so that variation in application can be suppressed and the application efficiency to the work 30 can be improved. it can.

  In the rotary spray coating apparatus 1 of this embodiment, the forced air supply apparatuses 3 and 4 showed the example made into a box, However, This invention is not limited to this. For example, it may be arcuate or irregular.

1 Rotary spray coating device 3,4 Forced air supply device 12 Spray nozzle M Mist-like paint R Circumferential orbit

Claims (1)

  A plurality of spray nozzles capable of spraying a mist-like paint, and a forced air supply device capable of supplying a plurality of linear airflows, wherein the spray nozzles rotate along a circumferential trajectory; The air supply device is located above the spray nozzle and allows relative rotation of the spray nozzle, and the forced air supply device can rectify the flow of mist paint from the spray nozzle with a straight airflow. Rotary spray painting equipment characterized by

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