JPH0340390Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a coating device for painting the top and side surfaces of automobiles being transported along a conveyance path in a painting booth, and in particular, The present invention relates to measures to improve the compatibility of paints in the polymerization region of each paint sprayed from a rotary atomizing electrostatic paint gun for painting and a rotary atomizing electrostatic paint gun for painting the upper side surface of an automobile.

(Prior Art) Conventionally, as disclosed in Japanese Patent Publication No. 50-19577, a coating device for automobiles of this type has been equipped with one top spray gun ( A side spray gun (paint gun) is mounted facing downward, and a side spray gun (paint gun) is mounted on the upright supports provided on both sides of the conveyance path so as to face almost perpendicular to the side of the vehicle. It is known that the gun is controlled to be movable up and down and left and right, and the side spray gun is controlled to be movable up and down, so that a coating film is uniformly formed on the top and side surfaces of a car. .

Conventionally, a pair of rotary coating machines (hereinafter referred to as "bells") corresponding to the top spray gun are attached to a horizontal support frame, and the horizontal support frame is supported by an upright support frame so as to be movable up and down. is capable of reciprocating in the direction perpendicular to the transport direction and in the vertical direction, and a plurality of bells for painting the sides of the car are sequentially arranged on an upright support frame from one for painting the upper part of the side of the car to one for painting the lower part. It is also known that the top and side surfaces of the vehicle are painted.

(Problems to be solved by the invention) However, the above conventional method had the following problems. In other words, in the former case, the top and side surfaces of a car are painted using one top spray gun and a pair of left and right side spray guns, so the stroke required for each spray gun to reciprocate is long, and therefore the amount of time required for one spray gun is long. Since the reciprocating movement takes time, the conveyance speed is naturally limited in order to uniformly paint the top and side surfaces of automobiles, which poses problems in terms of work efficiency.

On the other hand, in the latter type of painting equipment, the top of the car is painted with two bells, and the sides are painted with multiple bells over the entire top and bottom width at once.
Although the conveyance speed of automobiles has been significantly shortened and the problem of work efficiency due to the former conveyance speed restriction has been solved, the horizontal support frame and vertical support frame that support each bell are installed inside the paint booth. In particular, since the upright support frames are erected on both sides of the conveyance path, the upright support frames obstruct the movement of the plural side surface painting bells that are arranged in parallel at a predetermined interval in the conveyance direction. The installation space is limited accordingly, especially for the bell that paints the upper side of the car.
Does not correspond to the lower part of the bell that paints the top of the car,
Therefore, the sprayed paints do not blend together in the polymerization area of each paint sprayed from both bells (the painting interval of both bells is long, and after the first sprayed paint dries, the next paint is applied on top of it). As a result, there was a problem in that streaks and other unevenness occurred in this polymerized region.

The present invention has been devised in view of these points, and its purpose is to further improve the latter conventional coating device as described above, by replacing the upright column of the support frame on which the upper coating bell is supported with the coating booth. By placing it on the outside, the space in the painting booth that was previously occupied by the standing pillar can be used as the installation space for at least the side painting bell that paints the upper side of the car. The objective is to shorten the painting interval of the bell as much as possible to improve the conformability of the paint in the polymerization region.

(Means for Solving the Problems) In order to achieve the above object, the solution means of the present invention provides the above-mentioned solutions in a coating device that paints the top and side surfaces of automobiles conveyed along a conveyance path in a painting booth. Standing columns of a support frame are provided adjacent to the outside of the painting booth, and cross beams of the support frame are extended into the painting booth from the tops of the columns. A rotary atomizing electrostatic coating gun for painting the upper surface of an automobile is supported on the crossbeam so as to be movable in a direction perpendicular to the conveying direction. Furthermore, a plurality of rotary atomizing electrostatic coating guns for painting the side surfaces of the automobile are arranged at different vertical positions on the side of the conveyance path in the painting booth to paint the upper side surface, middle side surface portion, and lower side surface of the vehicle. . At this time, among the rotary atomizing electrostatic paint guns for painting each side surface, the paint gun that paints the upper side of the car is placed below the crossbeam in the painting booth in close proximity to the rotary atomizing electrostatic paint gun for painting the upper part. The two coating areas are arranged so that they partially overlap.

(Function) With the above configuration, in the present invention, a side surface painting rotor for painting the upper side, middle side, and lower side of the automobile is installed in the painting booth corresponding to the standing pillars installed adjacent to the outside of the painting booth. By installing the atomizing electrostatic painting guns at different heights, one of the painting guns is for painting the upper side of the car, and the other for painting the upper side of the car is located above it. The coating interval with the rotary atomizing electrostatic coating gun is shortened as much as possible, and the compatibility of each paint in the polymerization region of the paint sprayed from both guns is improved.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

1 and 2 show an automobile painting apparatus according to an embodiment of the present invention, in which 1 is a conveyance path, M is an automobile conveyed by a trolley 3 along the conveyance path 1, and 4
is a painting booth installed in the painting work area of the automobile M on the conveyance path 1. Reference numeral 5 denotes a support frame installed to straddle the conveyance path 1, and the support frame 5 is connected to a pair of upright pillars 6, 6 erected on both sides of the painting area of the automobile M on the conveyance path 1. A frame is formed with a cross beam 7 which is supported as a bridge between the supporting pillars 6, 6 so as to be able to rise and fall, and the pair of pillars 6, 6 are connected to the conveying path so as to be adjacent to the outside of the coating booth 4, respectively. It is arranged on both sides of 1, and
The cross beam 7 extends into the coating booth 4 from the upper part of the vertical column 6 so as to be horizontally movable up and down within a predetermined height area above the coating booth 4.

Further, each of the vertical pillars 6 is equipped with a lifting device 8 that moves the cross beam 7 up and down in the vertical direction. The lifting device 8 includes a pair of sprockets 9, 9 provided at upper and lower positions of the vertical column 6, and both sprockets 9, 9.
A chain 10 wound between them, a rotational drive device 11 such as an electric motor for chain-driving the one (lower end) sprocket 9, and both sprockets 9,
A guide member 1 extending in the vertical direction installed between 9
2, and a sliding body 13 which is slidably supported by the guide member 12, to which each end of the cross beam 7 is connected and fixed, and which engages with the chain 10.
The chain 10 rotates in the vertical direction by the drive of the rotation drive device 11, and the sliding body 13 that engages with the chain 10 slides in the vertical direction under the guide of the guide member 12. By this,
It is configured to move the cross beam 7 up and down in the vertical direction as shown by the arrow.

Further, on the cross beam 7, a pair of rotary atomizing electrostatic coating guns (hereinafter simply referred to as upper coating guns) 15, 15 for coating the upper surface of the automobile M can reciprocate in a direction perpendicular to the conveying direction. and is suspended and supported by a connecting member 14 at a predetermined interval, and inside the crossbeam 7 are both upper painting guns 1.
A horizontal reciprocating device 16 for reciprocating the components 5 and 15 in horizontal left and right directions is installed inside. The horizontal reciprocating device 16 is made of the same components as the lifting device 8, and includes a pair of sprockets 17, 17 provided on the left and right sides of the crossbeam 7, and both sprockets 17, 17.
A chain 18 wound between them, a rotary drive device 19 that drives the sprocket 17 on one side (the one on the right side in the figure), and both sprockets 17,1.
The upper coating guns 15 are slidably supported by a guide member 20 extending in the horizontal left and right direction, and the upper end portions of each of the upper painting guns 15 are connected and fixed, and are engaged with the chain 18. The upper coating gun 15 is configured to reciprocate in the horizontal left and right directions together with the sliding bodies 21, 21 by the rotation drive device 19.

Each of the upper painting guns 15 is equipped with a sprayer 22 at its tip (lower end) that rotates and sprays the paint, and the paint is sprayed outward in the circumferential direction by the action of centrifugal force caused by the rotation of the sprayer 22. It is equipped with a shroud 23 that controls the area, a motor 24 that rotates the sprayer 22, and a color change valve 25 that switches multiple colors of paint supplied from a paint supply device (not shown) to a desired color depending on the vehicle type. .

The above-mentioned both upper coating guns 1 configured in this way
5 and 15 move horizontally as shown by the arrows by the operation of the horizontal reciprocating device 16 to paint the upper surface of the automobile M. This is a so-called 2-bell reciprocating type. Furthermore, each upper coating gun 15 can obtain an optimal stroke in response to variations in vehicle models and width changes on the top surface of the automobile M (for example, differences in the width of the front bonnet and the width of the roof). is controlled by a variable stroke controller (not shown).

On the other hand, 26 to 28 are respectively disposed in the paint work area, that is, on each upstream side of the painting booth 4 (on the side of the conveyance path 1), and are a plurality of (three in the figure) side surfaces for painting the side surfaces of the automobile M. It is a rotary atomizing electrostatic coating gun for painting (hereinafter simply referred to as a side coating gun), and each side coating gun 26 is provided on each side.
.about.28 are disposed symmetrically with those on the other sides so that their mounting height positions gradually become lower from the upstream side to the downstream side. That is, a gun 26 for painting the upper side of the car M is disposed on the most upstream side, a gun 27 for painting the middle part of the side of the car M next, and a gun 28 for painting the lower side of the car M on the most downstream side. The three side surface painting guns 26 to 28 each share the task of painting the entire width of the side surface of the automobile M in the vertical direction.

The side surface painting guns 26 on the most upstream side that paint the upper side surfaces of the automobile M are connected to both sides of the conveyance path 1 in the painting booth 4 corresponding to each upright pillar 6 of the support frame 5, that is, the cross beam 7. It is disposed below and close to the upper coating gun 15, and is adapted to paint at least the upper side of the automobile M. Furthermore, the painting areas of the side surface painting gun 26 and the top painting gun 15, which paint the upper side surface of the automobile M, are designed to partially overlap. In addition, each side painting gun 26
28 are each mounted on a stand 29 so that the mounting height position thereof can be varied depending on the vehicle type. Also. Each of the side surface painting guns 26 to 28 is constructed in the same manner as each of the upper painting guns 15 described above.

Each painting gun 15, 26 configured as described above
28 are controlled in operation based on detection signals from a phototube 30 arranged near the upstream side of the painting work area (painting booth 4) of the conveyance path 1.
That is, by blocking the emitted light from the phototube 30, the car M transported along the transport path 1 is moved to the painting work area based on the amount of change in this emitted light.
is detected and the detection signal is input to a counter (not shown), and predetermined data (paint spraying width for the imported automobile M) is determined according to the vehicle type from pre-stored painting data. .

Next, the operation of the automobile painting apparatus of the above embodiment will be explained.

First, each of the painting guns 15, 26 to 28 is not in operation when the transported automobile M has not reached the painting work area (painting booth 4) on the transport path 1. Then, the car M is transported to the vicinity of the painting work area (painting booth 4), and its tip is connected to the photocell 3.
When the automobile M reaches a predetermined position in the painting work area (painting booth 4) by blocking the radiation light of When activated, it descends to a predetermined height position and starts painting the front bonnet m1 on the upper surface of the automobile M while performing reciprocating motion. Then, the pair of upper coating guns 15,1
5 gradually rises when it approaches the front pillar m2, and then stops the rising operation at a predetermined height position above the roof m3 to paint the roof. Thereafter, when the painting of the roof m3 is completed and it approaches the rear pillar m4, the roof m3 is gradually lowered, and the lowering operation is stopped at a predetermined height position above the trunk lid m5, and the roof m3 is painted. While repeating the lifting and lowering movements in this way,
By performing the reciprocating motion, the entire upper surface of the automobile M is spray-painted. During this time, when the automobile M is transported to the position corresponding to each of the side surface painting guns 26 to 28, the side surface painting guns 26 to 28 on both sides operate one after another, covering the entire vertical width of the side surface of the vehicle. Then spray painting is started and the painting is done.

In this way, each of the above painting guns 15, 26 to 2
8, each painting area is painted in the third stage.
It is done as shown in the figure. FIG. 3 shows the spray conditions (spray patterns) of the upper coating gun 15 which is painting the roof 31 or the upper side of the automobile M, and the side coating gun 26 which is painting the upper side of the automobile M. In the figure, _L1 indicates the area where the spray paint from the side coating gun 26 overlaps when the upper coating gun 15 sprays while moving as shown in the imaginary line, and L2 indicates the upper and middle portions of the side of the automobile M. This is the polymerization area of the spray paint of each side surface painting gun 26, 27. That is, since volatile organic solvents are used in the paint, if the painting interval is long, the paint sprayed from the upper paint gun 15 will dry immediately, and the paint will be sprayed next by the side paint gun 26. The paint is sprayed onto the dried paint (paint film) in the polymerization region _L1 . In such a case, the conformability of each sprayed paint will be reduced, and streaks and the like will occur on the painted surface, resulting in a poor finished appearance. In the present invention, as shown in FIG.
It is located below and close to the upper coating gun 15 to shorten the distance between it and the upper coating gun 15 in the transport direction as much as possible. Therefore, since the painting interval between the top surface and the upper side surfaces of the automobile M is shortened, the next paint is immediately sprayed while the previously sprayed paint is not dry, and the above-mentioned polymerization area _L1 is sprayed.
This will improve the compatibility of the paint. Therefore, it is possible to obtain a coating with an excellent external finish without streaks and the like, and to improve its quality.

Further, in the embodiment described above, since each of the vertical columns 6 is located outside the painting booth 4, maintenance such as repair can be easily and quickly performed when the lifting device 8 installed in each vertical column 6 breaks down. In addition,
There is no risk of spray paint from each painting gun 15, 26 adhering to each standing pillar 6, and therefore each standing pillar 6
In the conventional apparatus in which the paint was placed inside the painting booth 4, a film or sheet was wrapped around each vertical pillar 6 to prevent the spray paint from adhering to it, but there is no need to replace the film or the like. Furthermore, there is no risk of dust or the like being generated during this replacement work, and the coating environment within the coating booth 4 is improved.

Furthermore, in the above embodiment, since the space in the painting booth 4 corresponding to each vertical pillar 6 is utilized, the length of the plurality of side surface painting guns 26 to 28 in the conveying direction is equal to the width dimension of each vertical pillar 6. This makes it possible to shorten the length of the coating booth 4 in the conveying direction, thereby reducing equipment costs.

Further, in the above embodiment, the stroke of each upper coating gun 15 can be changed in response to a change in the width dimension of the upper surface of the automobile _M (for example, the width dimension is different between the front bonnet _m1 and the roof m1). Therefore, the sprayed paint can be sufficiently supplied to the side edges of the front bonnet _m1 , which has a large width dimension, and the upper surface of the automobile M can be coated uniformly without uneven coating thickness.

Note that the present invention is not limited to the above-mentioned embodiments, but includes various other modifications.
For example, in the above embodiment, the support frame 5 is installed on the upstream side of the coating booth 4, and the plurality of side coating guns 26 to 28 are disposed downstream from the support frame 5. It is also possible to arrange a plurality of side painting guns 26 to 28 on the upstream side of the booth 4 and install the support frame 5 on the downstream side.
Various other changes are possible.

(Effects of the Invention) As explained above, according to the automobile painting apparatus of the present invention, the pillars of the support frame supporting the upper coating gun are provided adjacent to the outside of the painting booth,
Since the space in the painting booth corresponding to the above-mentioned pillar is used for installing at least the side painting gun that paints the upper side of the car, the painting interval between the side painting gun and the upper painting gun is reduced. This shortens the time and allows the next paint to be sprayed immediately before the previously sprayed paint dries, improving the compatibility of each paint in the polymerization area of the paint sprayed from both paint guns. , it is possible to achieve both improvement in painting work efficiency and high quality external finish. Further, it has the advantage of improving maintenance such as repair and maintenance of the lifting device, improving the painting environment, and further reducing equipment costs.

[Brief explanation of the drawing]

1 to 3 show embodiments of the present invention,
Figure 1 is a rear view, Figure 2 is a partially cutaway side view, and Figure 3 is an enlarged view of main parts showing the state of paint spraying between the upper paint gun and the side paint gun that paints the upper part of the side of the vehicle. FIG. 1... Conveyance path, 4... Painting booth, 5... Support frame, 6... Vertical column, 7... Cross beam, 15... Rotary atomizing electrostatic coating gun for upper coating (upper coating gun),
26...Rotary atomizing electrostatic coating gun for side surface painting (side surface coating gun), M...Automobile.

Claims (1)

[Scope of utility model registration request] A painting device that paints the top and side surfaces of automobiles being transported along a conveyance path inside a painting booth, which comprises a standing pillar installed adjacent to the outside of the painting booth and a side extending from the top of the standing pillar into the painting booth. A support frame consisting of a girder, a rotary atomizing electrostatic coating gun for upper coating, which is movably supported by the cross beam of the support frame in a direction perpendicular to the conveying direction and paints the upper surface of the automobile, and A plurality of rotary atomizing electrostatic coating guns for painting side surfaces are arranged at different vertical heights on the side of the conveyance path and paint the upper side, middle side, and lower side of the vehicle, each of the side surfaces Among the rotary atomizing electrostatic painting guns for painting the upper part, a painting gun for painting the upper side of the automobile is arranged below the crossbeam in the painting booth so as to be close to the rotary atomizing electrostatic painting gun for painting the upper part, An automobile painting device characterized in that both coating areas partially overlap.