JPH0355184B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a spray device for painting the inner surface of a can, and particularly to a three-nozzle spray device provided with nozzles for painting the crevasse portion.

(Prior art) The inner surface of the can is coated with two paints, one for the can body and the other for the can end plates, inside the empty can that is momentarily stationary in a fixed position and that is rotating at high speed.
This is done by inserting a book spray gun like a spear and spraying the paint.

As a spray device for this purpose, a lance type spray device as shown in FIG. 3 is conventionally known. The spray device includes a body gun 15 for painting the inner surface of the can body and an end gun 1 for painting the inner surface of the can end plate.
6 are combined together and fixed on a moving table 17, and the base ends of each are connected to paint supply pipes 18 and 1.
9 to the paint supply source. A body nozzle 20 is provided at the tip of the body gun 15 to spray paint at a certain angle to its axis, and an end nozzle 21 is provided at the tip of the end gun 16 to spray paint in the axial direction. Then, the mobile cart 17 is placed on the machine platform 22,
It is provided to be driven back and forth toward the rotary let 23 in which the can is held.

When painting the inside of a can, the rotary let 23, which holds the can c and revolves around it, stops for a certain period of time when it reaches the position where the spray device is installed. In the meantime, the moving trolley 17 supporting the body gun and end gun moves on the machine base 22,
As shown by the imaginary lines in FIG. 3, the nozzles 20 and 21 at the tips of the body gun 15 and end gun 16 are gradually introduced into the rotating can c held by a turret, and paint is ejected from each nozzle during the entry process. The inside of the can is then painted.

Therefore, in this coating method, coating the crevasse that occurs at the seam around the bottom edge of a three-piece can can be done either by excessive paint applied on the end flowing into the crevasse due to centrifugal force, or by A method is used in which excess paint applied to the can body is allowed to drip naturally at an upright position during transportation.

For this reason, the crevasse and coating are greatly affected not only by the spray conditions, but also by the conveyance conditions and drying conditions. Alternatively, there was a problem in that excess paint foamed into caramel-like blisters. Furthermore, in neck-in cans in which the diameter of the can body is reduced near the seam, there is a problem in that paint tends to accumulate in the neck shoulder where the diameter is reduced, and it is difficult for the paint to naturally hang down into the crevasse.

In order to avoid the above problems and ensure that the crevasse area is coated, it is desirable to spray the can body, end, and crevasse area with separate nozzles. However, in the above device called the lance type, the number of guns that can be inserted into the can body is limited to two, one for the end and one for the body, and three guns were considered impossible.

(Problems to be Solved by the Invention) The present invention was devised to solve the above-mentioned drawbacks of the conventional can interior spray device, and is capable of reliably cleaning the crevasse area without providing a gun for the crevasse. It is an object of the present invention to provide a spray device that can be used for painting, saves on paint, and can be easily applied to conventional spray devices.

(Means for Solving the Problems) The present invention solves the above problems by attaching a nozzle tip body to the tip of the end gun in a conventional spray device having a body gun and an end gun, and providing a branching path in the paint flow path of the nozzle tip body. The problem was solved by configuring a three-nozzle spray device by providing an end nozzle at the tip of the paint flow path and a crevasse nozzle for spraying paint into the crevasse of the can at the tip of the branching path.

(Function) From the crevasse nozzle installed in the end gun,
The paint can be directly sprayed onto the crevasse, making it possible to reliably paint the crevasse parts where paint has conventionally been prone to come off. In addition, since the crevasse nozzle is provided by forming a branching path in the nozzle tip body attached to the end gun, there is no need to provide a separate crevasse gun, and the structure can be made compact and can be freely accessed and removed from the inside of the can. ,
Easy to adapt to conventional equipment.

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

FIG. 1 is a schematic view of the spray gun section of the three-spray device of this embodiment, showing the state in which it has penetrated into a can 1 (shown in cross section).

In the figure, reference numeral 2 denotes a body gun, which has a body nozzle 10 at its tip that sprays paint at a constant angle to its axis to paint the inner surface of the can body.
3 is an end gun, and a nozzle tip body 3' is attached to the tip thereof. A cross section of one embodiment of the nozzle tip body 3' is shown in FIG. As shown in the figure, the nozzle tip body 3' has a branch path 11 formed in the middle of the paint flow path 7, and the paint is sprayed in the axial direction of the end gun at the tip of the paint flow path 7 as in the conventional case. An end nozzle 8 for painting the inner surface of the can end plate is provided at the tip of the branching path 7, and the paint is sprayed toward the crevasse portion of the can at a certain angle with the end nozzle to paint the crevasse portion. A crevasse nozzle 9 for painting is provided.

And the body gun 2 and the end gun 3
is fixedly supported on a moving table (not shown), and its base end is connected to a paint supply source, similar to the conventional lance type spray device shown in FIG.

The apparatus of this embodiment is constructed as described above, and the body gun 2 and the end nozzle 3 are inserted into a rotating can, and the body nozzle 10 and the end nozzle 8 are inserted into the can.
By spraying the paint from the crevasse nozzle 9, the paint is directly sprayed toward the inner surface of the can, the inner surface of the can end plate, and the crevasse, thereby uniformly coating the inner surface of the can.

Therefore, when painting the inside of a can using a conventional lance-type spray device, for example, in the case of a neck-in can as shown in FIG. Furthermore, the step 6 makes it difficult for the paint sprayed onto the inner surface of the can end plate to flow into the crevasse 5 due to centrifugal force, resulting in paint leakage at the crevasse. The coating can be applied reliably without the risk of such phenomena occurring.

(Effects of the Invention) Since the present invention has the above configuration, the crevasse portion can be painted by directly spraying paint using a dedicated nozzle, so problems such as paint omission do not occur.

In addition, there is no need to spray excessive amounts of paint onto the can body or end, which can save approximately 10% of the amount of paint used and prevent blisters and blisters from occurring.

This can be implemented by simply replacing the nozzle tip body 3' of a conventional lance-type spray device, and there is no need to spend a large amount of money to improve the device.

It has remarkable effects such as

[Brief explanation of drawings]

The drawings show an embodiment of a three-nozzle spray device according to the present invention, FIG. 1 is a schematic side view thereof, FIG. 2 is a sectional view of one embodiment of the nozzle tip body, and FIG. 3 is a diagram showing a conventional lance-type spray device. FIG. 1: Netquin can, 2: Body gun, 3: End gun, 3': Nozzle tip body, 5: Crevasse, 7: Paint channel, 8: End nozzle, 9: Crevasse nozzle, 10: Body nozzle, 11: Branch path.

Claims (1)

[Claims] 1. A body gun with a body nozzle at the tip,
An end gun having an end nozzle at the tip is combined and fixed on a moving table, and as the moving table moves, the body nozzle and the end nozzle enter the can together, and the can body is removed from the body nozzle. In a spray device for painting the inner surface of a can by spraying paint from the end nozzle onto the inner surface of the can end plate, a nozzle tip body is attached to the tip of the end gun, and a branch path is provided in the paint flow path of the nozzle tip body. A three-nozzle spray device, characterized in that an end nozzle is provided at the tip of the paint flow path, and a crevasse nozzle for spraying paint into a crevasse portion of a can is provided at the tip of the branch path.