JPH0543877Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an automatic spray gun that is installed in a device that performs automatic painting work such as a painting robot and performs spray painting. This invention relates to an automatic spray gun that can be used by switching the spreading direction of a pattern between vertical and horizontal directions using a compressed air flow.

[Prior Art] Once the automatic spray guns used in painting robots and automatic painting equipment are set, the spray pattern is determined by the mounting direction of the main body. Therefore, the direction of movement of the spray gun is naturally limited, making it impossible to carry out necessary painting operations and resulting in poor efficiency. As a countermeasure to this problem, the spray gun has been rotated to increase the number of moving directions, or the conveying device for the object to be coated has been rotated, but both of these methods result in a significant increase in equipment costs, so they are simply equivalent. A spray gun was proposed that could perform the function. The spray gun has a flat pattern formed in the atomizing part, and two sets of side air holes are provided in advance to determine the direction, one for vertical and one horizontal. A pattern is formed in either direction by supplying compressed air to any one of the sets. (Special Publication No. 59-1096) This spray gun is a conventional spray gun with new side air holes added, and these side air holes protrude in front of the atomization position of the paint sprayed by the spray nozzle. It is installed at a corner of the spray and is configured to be sprayed toward the center of the spray.
Therefore, when compressed air is injected through one set of side air holes to flatten the spray pattern, the spray pattern spreads out toward the other set of corners, and the spray particles of paint are spread around the corners and the other corners. This results in a lot of adhesion to the side air holes at the corners. Therefore, these adhered paints are blown onto the object to be coated, staining the painted surface, and especially in automatic painting where continuous painting is required, the most inefficient result is interruption of painting.

In addition, two air passages are required to control these patterns, and these air passages are communicated with the air cap through the paint nozzle from the main body, which not only complicates the passage but also causes problems in not only the air cap but also the air cap. Even the paint nozzle needs to have a new structure. This means that even the paint nozzle needs to be replaced when using an air cap that can only be used in one direction as before, making the work more complicated.

[Problems to be solved by the invention] As mentioned above, in an air cap that is provided with side air holes for forming patterns in two orthogonal directions, compressed air is injected from one of the opposing air holes. When a pattern is formed, the pattern spreads toward the other protruding corner and the side air hole provided in the corner, so the corner and the side air hole in the corner are easily contaminated by paint particles. This will require cleaning within a short period of time. Therefore, even if automatic painting is performed, constant monitoring is required, which is extremely inefficient and difficult to put into practical use.

In addition, preparing not only an air cap but also a dedicated paint nozzle is not only complicated in manufacturing, but also in actual handling during use.
There remained a need for further simplification.

[Means for Solving the Problems] The present invention provides a spray gun having a spray nozzle at the center and side air holes for spraying compressed air from both sides of the spray nozzle to form a flat spray pattern. Four side air holes are formed on the top and bottom, left and right, and a pair of first side air holes facing each other and another pair of second side air holes perpendicular to these form air passages separately, The first side air hole communicates with the first side air introduction hole provided in the main body through the side air passage of the paint nozzle, and the second side air hole is opened at the rear end of the air cap and communicates with the first side air introduction hole provided in the main body through the side air passage of the paint nozzle. The nozzle communicates with the second side air introduction hole provided in the main body through the space formed between the outside of the nozzle and the cap cover, and the tip of the corner having the side air hole allows the air to be injected from the side air hole. The spray gun is characterized by a pattern-changeable spray gun, which is located behind the position where the jetted air flows collide with each other, and the outlet of the side air hole is located behind the atomization device in front of the spray nozzle. .

[Embodiment] FIG. 1 is a cross-sectional view of an automatic spray gun showing one embodiment of the present invention, showing the - cross section of FIG. 2 when the tip of FIG. 1 is viewed from the front.

The paint nozzle 1 has a spray nozzle 2 at its tip, the opening of which is opened and closed by a needle valve 3 provided inside to control the spraying of paint. The paint nozzle 1 has a central air passage 4 and a side air passage 5, each of which is an independent passage by means of an air cap 7 and a tapered sheet surface formed on the main body 20, respectively.

An air cap 7 which is attached to cover the tip of the paint nozzle 1 forms a central air hole 8 around the spray nozzle 2, and the paint is atomized by the air ejected from the central air hole 8. Furthermore, first side air holes 9 and 10 facing toward the front center axis of the spray nozzle 2 are provided in the corner 6 of the air cap 7 located outside the spray nozzle 2 at opposing positions.

Second side air holes 11 and 12 are provided opposite to the first side air holes 9 and 10 in the same manner at right angles. These side air holes are oriented diagonally to intersect on the front central axis of the spray nozzle 2 and are drilled in each corner 6 of the air cap.

The tips of these corners 6 are formed rearward from the position where the jet air flows collide with each other. To be more specific, the air injected from the side air holes gradually spreads out, and the collision position here refers to the flow including this diffused flow.

In addition, each side air hole is connected to the spray nozzle 2.
It is located behind the front atomization position. This atomization position may be considered to be located forward by approximately the same dimension as the diameter of the central air hole 8.

The first side air holes 9 and 10 communicate with a first side air introduction hole 15 provided in the main body 20 via the side air passage 5 of the paint nozzle 1. In addition, the second side air holes 11 and 12 are opened at the rear surface of the air cap 7 without special hole processing for communication, and are connected to the main body 20 through a space 14 formed between the air cap 7 and the cap cover 13. Second side air introduction hole 1 provided
It communicates with 6. Needless to say, each air introduction hole in the main body 20 is configured to send independent control air to control the spray.

[Effects of the invention] According to the invention, it is possible to manufacture the paint nozzle used in conventional air spray guns without changing it, and it can be used for both, so the manufacturer can change the conventional gun with minimal modification. In addition to being able to do this, it also has the effect of reducing the annoyance on the user's side. Of course, you can easily change it to use it as a regular spray gun for multiple purposes.

In addition, as in the present invention, prevention of paint from adhering to the corners of the air cap, which is an essential requirement for a sprayer that automatically paints by controlling the supply air, has been achieved, and by mounting it on a painting robot, etc. It is also possible to spray for a long time, making it suitable as a spray gun for spray painting while changing the pattern direction.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a spray gun showing one embodiment of the present invention, and represents the negative cross-section of the front view shown in FIG. FIG. 2 shows a front view of FIG. 4... Central air passage, 5... Side air passage, 6
... Corner, 8 ... Center air hole, 9, 10 ... 1st
Side air holes, 11, 12...Second side air holes.

Claims (1)

[Scope of utility model registration request] In a spray gun having a spray nozzle in the center and side air holes for injecting compressed air from both sides of the spray nozzle to form a flat spray pattern, the side air holes are formed at four locations on the top and bottom, left and right, and each A pair of first side air holes facing each other and another pair of second side air holes perpendicular thereto form separate air passages, and the first side air hole is a side air passage of a paint nozzle. The second side air hole is opened at the rear end of the air cap, and the space formed between the outside of the paint nozzle and the cap cover is communicated with the first side air introduction hole provided on the main body. Through
The tip of the corner part that communicates with the second side air introduction hole provided in the main body and has the side air hole is located at the rear of the position where the jet air streams injected from the side air hole collide with each other, and A spray gun capable of changing patterns, characterized in that the outlets of the side air holes are respectively provided at the rear of the atomizing device in front of the spray nozzle.