KR101764676B1

KR101764676B1 - revolving spray nozzle for painting and painting method of pipe

Info

Publication number: KR101764676B1
Application number: KR1020150129810A
Authority: KR
Inventors: 이동복
Original assignee: (주)에스시아이
Priority date: 2015-09-14
Filing date: 2015-09-14
Publication date: 2017-08-03
Also published as: KR20170032535A

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a rotary spray nozzle for painting and a method of coating an inner surface of a pipe using the rotary spray nozzle. More particularly, the present invention relates to a rotary spray nozzle for painting, To an inner coating method of the coating film.
The rotary type spray nozzle for painting according to the present invention comprises a housing having a narrow upper part and a wider conical mixing space part formed therein, a bottom plate formed on the housing and forming a bottom of the mixing space part, A plurality of ejection holes formed at a predetermined interval on the edge of the bottom plate so as to be ejected to the bottom plate, a boss protruding from the bottom plate and engaged with the rotation axis of the motor and positioned at the center of the mixing space, To increase the mixing time of the paint introduced into the mixing space part to increase the mixing of the paint.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary spray nozzle for painting,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a rotary spray nozzle for painting and a method of coating an inner surface of a pipe using the rotary spray nozzle. More particularly, the present invention relates to a rotary spray nozzle for painting, To an inner coating method of the coating film.

Generally, various components such as a door are assembled to the vehicle body during the assembling process of the vehicle, and the vehicle thus assembled is finally passed through the painting process for painting the outer panel.

At this time, the equipment for painting the outer panel in a sealed booth is a painting equipment, and the operation of the painting equipment is controlled through a controller. That is, in the coating process, coating equipment is installed in a closed booth, and an external control room isolated from the booth is provided with an operation unit operated by a worker and a controller for controlling the operation of the painting equipment by receiving signals of the operation unit do. In addition, a paint storage tank, an air tank, a thinner tank, and the like, which are connected to the painting equipment through a hose, are installed in an external work room isolated from the booth.

A bell sprayer is commonly used as a coating equipment. Korean Patent No. 10-0774326 discloses Bell organs. 1, a bell painting unit 5 is mounted on the tip of an arm 3 of the robot 1. The bell painting unit 5 includes a bell body 7 having a bell cup 7 at its tip, 9 and a paint line 11 for injecting the paint into the bell main body 9. [

The bell cup is a type of rotary spray nozzle that rotates the paint into fine particles by centrifugal atomization while rotating by an air motor.

When using the bell cup, one or two or more types of paint are supplied as a paint line to the inside of the bell cup. The paint introduced into the rotating bell cup is centrifugally atomized while the mixing space formed inside the bell cup rotates at a high speed inside the bell cup and is ejected to the outside through the ejection hole.

However, in the conventional bell cup, the mixing space formed therein is formed only in a simple conical shape with a wide bottom and a narrow top, so that the rotating paint moves linearly along the inner circumferential surface and is directly discharged through the jet holes. Therefore, the time required for the paint to stay inside the bell cup is very short, so that there is a problem that the mixing efficiency of the paint is not high when two or more kinds of paint are used.

Korean Registered Patent No. 10-0774326: Bell long term

It is an object of the present invention to provide a rotary spray nozzle for painting which can improve the mixing efficiency of a paint by increasing the residence time of the paint and an inner painting method of a pipe using the same.

In order to accomplish the above object, the present invention provides a rotary spray nozzle for painting, comprising: a housing having a narrow upper portion and a wider conical mixing space portion formed therein; A bottom plate formed on the housing and forming a bottom of the mixing space; A plurality of ejection holes formed at a predetermined interval on an edge of the bottom plate so that the paint introduced into the mixing space part can be ejected to the outside; A boss protruding from the bottom plate and coupled to the rotation axis of the motor and positioned at the center of the mixing space; And internal mixing increasing means formed inside the housing to extend the residence time of the paint introduced into the mixing space portion to increase the mixing of the paint.

The inner mixing increasing means includes a protruding vane formed along the inner circumferential surface of the housing and formed to protrude from the inner circumferential surface of the housing to the mixing space.

The projecting vanes are formed to be inclined downward.

At least two protruding vanes are formed on the inner circumferential surface of the housing so as to be vertically spaced apart from each other.

The internal mixing enhancing means is formed to protrude upward from the bottom plate and has a hill located between the boss and the inner circumferential surface of the housing.

The hill portions are gradually widened from the upper portion to the lower portion, and both sides of the hill portions are formed as inclined surfaces.

The boss gradually increases in outer diameter as it goes from the upper part to the lower part, and the outer surface of the boss is formed as an inclined surface.

The internal mixing increasing unit further includes a guide vane protruding from the inner circumferential surface of the housing to guide the flow of the paint so that the paint introduced into the mixing space can move to the outer surface of the boss.

And an external mixing increasing unit coupled to the housing or the bottom plate to switch the flow direction of the paint sprayed through the spray holes and to further mix the paint from the outside of the housing.

In order to achieve the above-mentioned object, the present invention provides a method for painting a pipe, comprising spraying the painting material onto an inner circumferential surface of the pipe while rotating the spraying nozzle by a motor after entering the spraying nozzle into the inside of the pipe.

As described above, the present invention can effectively increase the mixing efficiency of the coating material by increasing the residence time of the coating material.

1 is a perspective view showing a rotary type injection nozzle according to a conventional technique,
2 is a perspective view of a rotary injection nozzle according to an embodiment of the present invention,
FIG. 3 is a perspective view showing the bottom of the rotary type injection nozzle of FIG. 2,
Fig. 4 is a cross-sectional view of Fig. 2,
5 is a cross-sectional view of a rotary injection nozzle according to another embodiment of the present invention,
6 is a cross-sectional view of a rotary injection nozzle according to another embodiment of the present invention,
Fig. 7 is a partially cut-away perspective view of the rotary injection nozzle of Fig. 6,
FIG. 8 is a schematic view showing a state in which the inside of a pipe is painted using the rotary injection nozzle of FIG. 2,
9 is a cross-sectional view of a rotary injection nozzle according to another embodiment of the present invention,
FIG. 10 is a perspective view exaggerating the recess applied to FIG. 9,
11 is a cross-sectional view of a rotary injection nozzle according to another embodiment of the present invention.

Hereinafter, a rotary spray nozzle for painting according to a preferred embodiment of the present invention and an inner painting method of a pipe using the same will be described in detail with reference to the accompanying drawings.

2 to 4, the rotary injection nozzle 20 for painting according to an embodiment of the present invention includes a housing 21, a bottom plate 30 formed on the housing 21, a bottom plate 30 A boss 40 formed in the housing 21, and an inner mixing enhancing means formed inside the housing 21.

The housing 21 is formed in a bell shape whose lower outer diameter is larger than the upper outer diameter. In the interior of the housing 21, a conical mixing space portion 25 is formed. The mixing space 25 is formed in a conical shape with a narrow upper portion and a wider lower portion.

An extension portion 23 may be formed on the upper portion of the housing 21. The extended portion 23 is formed by extending a predetermined length in a straight line from the upper portion of the housing 21. [ Although not shown, the extension portion 23 is connected to the sprayer.

The bottom plate 30 is formed in the housing 21. The bottom plate 30 is formed in a plate shape to cover the lower portion of the mixing space 25 to form the bottom of the mixing space 25.

A plurality of ejection holes (31) are formed at the edge of the bottom plate (30). The ejection holes (31) are formed at regular intervals along the edge of the bottom plate (30). The ejection hole 31 is formed to abut the inner circumferential surface of the housing 21.

A boss (40) is formed at the center of the bottom plate (30). The boss 40 is formed to protrude upward from the bottom plate 30. The boss (40) is located at the center of the mixing space (25). An insertion hole is formed in the boss 40 so that the rotation axis 17 of the motor is inserted. The rotary shaft 17 of the motor is fastened to the bolt 19 inserted into the through hole 35 formed in the center of the bottom plate 30. [

When the motor is operated, the housing 21 rotates at a high speed. At the same time, one or two or more kinds of paints are introduced into the mixing space portion 25 of the housing 21. When two or more kinds of paints are introduced, the paints can be introduced into the mixing space part in an unmixed state. In addition, two or more kinds of paints may be introduced into the mixing space portion in a state where they are primarily mixed.

The paint introduced into the mixing space part 25 gradually moves to the lower part of the mixing space part 25 while rotating along the inner circumferential surface of the housing 21 by strong centrifugal force. That is, in the mixing space portion 25, the paint forms a descending swirl flow. At this time, the turning radius of the rotating paint increases gradually as it moves to the lower part of the mixing space part 25, and atomizes into fine particles and is discharged to the outside through the ejection holes 31.

It is necessary to increase the residence time of the coating material by interfering the flow of the coating material in the mixing space portion 25 in order to increase the mixing efficiency of the coating material in the mixing space portion 25. Therefore, the present invention includes internal mixing increasing means for extending the residence time of the paint introduced into the mixing space portion 25 to increase the mixing of the paint in the interior of the housing.

The internal mixing increasing means is provided inside the housing (21). As one example of the internal mixing increasing means, a protruding vane 50 is formed on the inner peripheral surface of the housing 21.

The protruding vanes 50 are formed in a circular shape around the inner circumferential surface of the housing 21. The protruding vanes 50 are formed to protrude from the inner circumferential surface of the housing 21 to the mixing space portion 25 to temporarily reduce the diameter of the mixing space portion 25. Preferably, the projecting vanes 50 are formed to be inclined downward.

The flow of the painting material pivoted down along the inner circumferential surface of the housing 21 is disturbed by the projecting feathers 50. The turning diameter of the painting material temporarily becomes smaller by the projecting feathers 50, and when passing through the projecting feathers 50, the turning diameter is increased again and falls. When the paint passes the protruding vanes 50, vortexes are generated at the bottom of the protruding vanes 50, thereby retarding the flow and improving the mixing effect.

Unlike the illustrated embodiment, the protruding vanes 50 may be formed of two or more vents. Referring to FIG. 5, two protruding vanes 50 are formed on the inner peripheral surface of the housing 21. Two protruding vanes 50 are formed vertically spaced apart. Therefore, the flow of the paint can be retarded further, and the mixing efficiency of the paint can be further improved.

Another example of the internal mixing increasing means is shown in Fig. 6 and Fig.

Referring to Figs. 6 and 7, the crest portion 70 is provided as the internal mixing increasing means.

The crest portion 70 is formed to protrude upward from the bottom plate 30. The crest portion 70 is formed so as to surround the boss 60. The hill 70 is located between the boss 60 and the inner peripheral surface of the housing 21. [ The crests 70 are gradually formed to be wider as they progress from the upper portion to the lower portion, and both sides of the crests 70 are formed as the inclined surfaces 71 and 75. The height of the peak 70 may be lower than the height of the boss 60.

As the boss 60 progresses from the upper portion to the lower portion, the outer diameter gradually increases, so that the outer surface of the boss 60 is formed of the inclined surface 65.

The internal mixing increasing means further includes a guide vane 80 for guiding the flow of the paint so that the paint introduced into the mixing space portion of the housing 21 can be moved in the direction of the inclined surface 65 of the boss 60.

The guide vanes 80 are formed at the inlet of the mixing space portion 25 of the housing 21. The guide vanes 80 are formed to protrude from the inner circumferential surface of the housing 21 to the mixing space 25. The guide vanes 80 are formed to be inclined downward.

The flow of the paint introduced into the mixing space portion 25 of the housing 21 is guided by the guide vanes 80 in the direction of the inclined surface 65 of the boss 60. The paint moves downward along the inclined surface 65 of the boss 60 and then moves upward along the right inclined surface 71 of the crest 70. The paint passing over the crest portion 70 moves downward along the left inclined surface 75 of the crest portion 70 and is ejected to the outside through the ejection hole 31.

As the flow of the paint rotates, the mixture can be well mixed while repeating the falling and the rising.

The rotary injection nozzle for painting according to another embodiment of the present invention further includes an external mixing increasing unit.

9 to 10, the external mixing increasing unit 90 further mixes the paint sprayed through the spray holes 31 formed in the bottom plate 30 from the outside of the housing 21, . This external mixing augmenting means can be coupled to the housing 21 or the bottom plate 30.

The illustrated external mixing increasing means 90 is installed in the spray nozzle in a form coupled to the bottom plate 30. [ The external mixing unit includes a mixing ball 91 having a bottom closed at the bottom and an open top at the bottom and an auxiliary mixing space 92 formed at an inner side of the mixing ball 91. The mixing ball 91 protrudes from the bottom of the mixing ball 91, And a coupling attachment portion 95 which is coupled to the bottom plate 30 by a coupling portion 19.

The mixing ball 91 is formed so that the auxiliary mixing space portion 92 gradually widens from the lower portion to the upper portion. The bottom of the mixing ball 91 is formed wider than the lower portion of the housing 21.

The coupling attachment portion 95 is formed so as to protrude upward from the bottom of the mixing ball 91 and has a circular through hole 97 formed in the center so that the bolt 19 can pass through.

The external mixing augmenting means described above is installed at a lower portion of the bottom plate 30 to switch the flow direction of the paint sprayed through the ejection holes 31 formed in the bottom plate 30. That is, the paint sprayed through the spray hole 31 impinges on the bottom of the mixing ball 91, and then flows upwardly along the inner inclined surface of the mixing ball 91 by the centrifugal force. This upward flow is opposite to the flow in which the paint falls in the housing 21 while rotating.

The paint that circulates around the housing 21 from the inside of the auxiliary mixing space portion 92 is accelerated while moving along the inclined surface 93. In order to further increase the effect of the mixing, as shown in FIG. 11, a toothed portion 99 may be formed to make concave and convex on the inner inclined surface of the mixing ball 91. By this sawtooth portion 99, a vortex is formed in the flow of the paint, so that the mixing effect can be further enhanced.

5 to 7 and Figs. 8 to 10 are the same as those of Figs. 2 to 4. Fig.

Hereinafter, an internal painting method of the pipe using the rotary injection nozzle shown in Figs. 2 to 4 will be described.

Referring to FIG. 8, a support pipe 110 connected to a paint supply unit (not shown) for supplying two or more types of paint at a constant pressure is extended to the inside of the pipe 200. A sprayer (100) is installed at an end of the support tube (110). A paint supply tube is provided inside the support tube 110 so that the paint can be supplied to the sprayer 100 from the paint supply unit.

The sprayer 100 includes a spray body 105 connected to the support tube 110 and provided with an air motor therein and a spray nozzle 20 coupled to the spray body 105 and rotatable. The housing of the injection nozzle 20 may be connected to the paint body 105 by a conventional rotary joint so as to be rotatable. The rotation axis of the air motor provided inside the painting body 105 is coupled to the boss of the injection nozzle 20. When the air motor is operated, the injection nozzle 20 rotates, and two or more types of paint are introduced into the rotating injection nozzle 20, and the paint is atomized while spraying. The entire inner circumferential surface of the pipe 200 can be coated by advancing or retracting the support pipe 110 at a constant speed.

Fine paint particles are uniformly applied to the inner circumferential surface of the pipe 200 through the spray nozzle 20 rotating inside the pipe 200. Since the inner circumferential surface of the pipe 200 is coated while rotating the injection nozzle 20, the present invention does not require a facility for rotating the pipe 200. [

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

20: injection nozzle 21: housing
25: mixing space part 30: bottom plate
31: Spout hole 40: Boss
50: protruding vest 70:
80: guide vest

Claims

An upper portion of which is formed with a housing portion in which a conical mixing space portion having a narrower width and a lower width is formed therein;
A bottom plate formed on the housing and forming a bottom of the mixing space;
A plurality of ejection holes formed at a predetermined interval on an edge of the bottom plate so that the paint introduced into the mixing space part can be ejected to the outside;
A boss protruding from the bottom plate and coupled to the rotation axis of the motor and positioned at the center of the mixing space;
And internal mixing increasing means formed inside the housing to extend the residence time of the paint introduced into the mixing space portion to increase the mixing of the paint,
Wherein the internal mixing increasing means is formed to protrude upward from the bottom plate and has a hill portion located between the boss and the inner peripheral surface of the housing and surrounding the boss,
The hill portion is formed to be gradually wider as it goes from the upper portion to the lower portion, the left and right sides are formed as inclined surfaces, and the height is formed lower than the boss,
Wherein the boss has a gradually increasing outer diameter as it goes from the upper portion to the lower portion, the outer surface of the boss is formed as an inclined surface,
The internal mixing increasing means may further include a guide vane protruding from the inner circumferential surface of the housing to be inclined downward to guide the flow of the paint so that the paint introduced into the mixing space portion can move to the outer surface of the boss A rotary atomizing nozzle for painting.

delete

The painting apparatus according to any one of claims 1 to 3, further comprising external mixing increasing means coupled to the housing or the bottom plate for switching the flow direction of the paint sprayed through the discharge hole and further mixing the paint from the outside of the housing Spray nozzle for spraying.

A spraying method of spraying paint onto an inner circumferential surface of a pipe while rotating the spray nozzle by a motor after advancing the spray nozzle of any one of claims 1 to 9 into the inside of the pipe .