JPH067808Y2 - Color changing device in coating machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a color changing device in a coating machine, and more particularly, to an improvement of the color changing device provided with measures for shortening the color changing time.

(Prior Art) In the painting process of automobiles, paints of various colors are selected according to the colors of parts to be produced. Therefore, the interior of the coating machine must be cleaned each time the color is changed.

FIG. 4 shows an outline of a color changing device for a coating machine which is well known in the past. As shown in this figure, the manifold 30 includes six types of color valves 31 to 31 in the illustrated case.
Is installed. The manifold 30 and the coating gun 32 are connected via a hose 33, and an intermediate valve 34 is interposed in the middle of the hose 33 (almost in the middle of the hose). This intermediate valve 34 is provided with inflow / outflow ports 35 and 36 for the cleaning liquid, and is intended to shorten the color change time by dividing the cleaning route of the paint supply path into two. That is, one cleaning route is a route that enters from the manifold 30 and exits from the outflow port 36 of the intermediate valve 34 (route that flows from I to II) and the other one from the inflow port 35 of the intermediate valve 34. It is a route that enters and exits to the coating gun 32 (route that flows in from III).

(Problems to be Solved by the Invention) In the above-mentioned conventional color changing device, although the cleaning is performed by dividing into two routes, this is merely a division of a single paint supply passage and another designated paint is used. In order to be able to supply the water, it is necessary that the cleaning is completed over the entire process of the above route. Therefore, if it is attempted to further shorten the color change time with this type, it is possible to increase the size of the cleaning liquid supply source to enable high-speed cleaning, but the equipment becomes large. In addition, the measure of providing at least two color changing devices also causes the same problem.

The present invention aims to reduce the color change time without increasing the size of the equipment and to solve the problem.

(Means for Solving the Problems) In order to achieve the above object, the present invention is to spray a work piece with a manifold in which a flow path is formed through which designated paints and cleaning liquids of a plurality of colors selectively flow. A color changing device of a type in which an intermediate valve having an inflow port of a cleaning liquid capable of communicating with a conduction path communicating with the spraying device by an opening / closing valve is interposed between a paint supply path connecting the spraying device for At the downstream end side of the flow path of the manifold, there are provided an outlet for the cleaning liquid and at least two branch valves capable of selectively communicating with the flow path, and the intermediate valve has at least the branch port. Introducing valves that are the same in number as the two branch valves and are individually switched between a position communicating with the communication path and a position communicating with the outside of the machine are provided. It is communicated with individually by a branch hose.

(Operation) In the color changing device of the coating machine configured as described above, at least two branch valves of the manifold, each branch hose, and each introduction valve of the intermediate valve allow
At least two branch paths are independently configured between the manifold and the intermediate valve.

While the paint is being supplied using one of the branch paths configured as described above, the other branch paths are in a standby state without being used. Therefore, at the time of the cleaning operation for color change, the paint can be sent through the branch path in the standby state, which is not used, without immediately cleaning the branch path that has been used. Therefore, the color change time can be shortened by the amount that the branch passage is not cleaned.

(Embodiment) An embodiment embodying the present invention will be described in detail below with reference to the drawings.

In the drawing, 1 is a manifold, and a flow path 2 is inside.
Has penetrated. Further, six types of color valves 3 to 3 shown in the drawing are mounted in parallel on the manifold 1, and each of them is an on-off valve V1 to V6 as shown in FIG. 2 (the on-off valves described below are basically all This type is used) and can communicate with the flow path 2. Further, a cleaning liquid inflow valve 4 having an opening / closing valve V7 is attached to one end surface of the manifold 1.

On the contrary, the flow dividing head portion 5 is formed on the other end surface, and the flow path 2 is coaxially extended therein. An outlet valve 6 for the cleaning liquid is attached to the front end surface of the flow dividing head portion 5 and has an opening / closing valve V8 for opening / closing the flow path 2. Also,
First and second flow dividing valves 7 and 8 are mounted on the flow dividing head portion 5 at positions orthogonal to the axis. Each of them can be communicated with the flow path 2 through the directional control valves C1 and C2 as shown in FIG. 3 (the switching valves described below are basically of this type). Both branch valves 7 and 8 are branched hose 9 and 10
It is connected to the intermediate valve 11 via.

The intermediate valve 11 is provided with first and second introduction valves 12 and 13 to which both branch hoses 9 and 10 are connected, and each is formed at the axial center of the intermediate valve 11 via direction switching valves C3 to C4. It is possible to communicate with the established conduction path 14. Further, the conduction path 14 communicates with a coating gun 16 via a hose 15. However, the branch hoses 9 and 10
Is set to be sufficiently longer than the hose 15 leading to the coating gun 16.

On the other hand, the first and second outflow valves 1 having on-off valves V10, V11 corresponding to the both introduction valves 12, 13 are provided.
7 and 18 are provided adjacent to each other, and the direction switching valves C3 and C4 in both the introduction valves 12 and 13 switch the flow path to the communication path 14 or the flow path to the outflow valves 17 and 18. It Similarly to the manifold 1, the intermediate valve 11 is also equipped with a cleaning liquid inflow valve 19 and can communicate with the conduction path 14 via the opening / closing valve V9.

The opening / closing valves V1 to V11 and the direction switching valves C1 to C4 are set so that they are opened and closed or switched according to the work each time the painting work or the cleaning work is performed.

The color changing device of this example is formed as described above.

When the painting work is performed, a paint of a predetermined color is selected and the manifold 1 is selected from the corresponding color valves 3 to 3.
Sent in. In this case, on the manifold 1 side, only the predetermined one open / close valve V1 to V6 of the color valve 3 is opened, and the designated paint introduced from here is introduced into the flow dividing head portion 5 through the flow path 2. However, at this time, the outflow valve 6 is closed, and the first and second diversion valves 7 and 8 are
Of these, only one side is open, and the paint is sent to the intermediate valve 11 through the branch hose 9 (10) on that side. In the intermediate valve 11, the on-off valve V9 of the inflow valve 19
Is closed and communicates with the conduction path 14 by switching the flow path by the direction switching valve C3 (C4) corresponding to the branch hose 9 (10), the paint is sent to the coating gun 16 through the hose 15. Then, the spraying work is performed on the work (not shown).

When the color is changed, only the cleaning liquid inflow / outflow valves 4 and 6 are opened in the manifold 1 and the flow dividing head portion 5. In this state, the cleaning liquid is sent from the inflow valve 4 and ejected from the outflow valve 6 through the flow path 2. Thus, the inside of the manifold 1 and the flow dividing head portion 5 is cleaned.

On the other hand, in the intermediate valve 11, the direction switching valve C3 (C4) of the introduction valve 12 (13) on the side where the paint was flowing
The flow path is switched to the non-communication state with respect to the conduction path 14, and the open / close valve V9 of the inflow valve 19 is changed.
Is opened and the cleaning liquid is fed from here. Conduction path 1
The path leading to the coating gun 16 via 4 is cleaned, but this work is performed in parallel with the above-described cleaning work inside the manifold 1.

When the cleaning of both the manifold 1 and the intermediate valve 11 is completed, the switching valve C2 of the shunt valve 8 (7) on the unused side
The flow path is switched by (C1), and similarly, the direction switching valve C4 (C
By 3), the flow path is switched so as to communicate with the conduction path 14.

Under this condition, the following designated paint is passed through the manifold 1, the diversion head portion 5 and the branch hose 10 (9) to the corresponding introduction valve 13 (12) to intermediate valve 1 (12).
Flow into the inside of 1. As a result, the specified paint is guided to the coating gun 16 through the conduit 14 and the hose 15, and the specified paint of another color is sprayed onto the work (not shown).

Now, according to this example, the manifold 1 side and the intermediate valve 11
Are connected to each other by two branch hoses 9 and 10. This allows the time spent using one hose to be used to clean the other. Therefore,
As long as the flow passage 2 of the manifold 1 is washed to change colors, the next designated paint is applied to the intermediate valve 11 without washing the branch hose 9 (10) on the side that has been used until now.
It will be possible to supply up to. That is, in the color changing work, it is not necessary to provide time for cleaning the branch hoses 9, 10 as compared with the conventional case, and the work time can be shortened. In particular, since the branch hoses 9 and 10 are sufficiently long and the ratio of the paint in the flow path is high, the fact that the cleaning can be omitted during this period is effective in shortening the color change time.

The type of the on-off valve / direction switching valve is not limited to the one shown in the figure, and it does not matter whether it is a manual type or an electromagnetic type.

(Effect of the Invention) As described above, according to the present invention, unlike the conventional one in which the arrangement of the intermediate valve needs to be set at a substantially intermediate position between the coating gun and the manifold, the position of the intermediate valve is not necessarily located at the center. It is not necessary to place it, but it can be placed near the coating gun and set so that the branch passage on the branch hose side can be lengthened, which will reduce the cleaning time without increasing the size of the equipment. Can be reasonably achieved.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an outline of the color changing device of this embodiment, FIG. 2 is a sectional view showing an on-off valve, FIG. 3 is a sectional view showing a directional switching valve, and FIG. 4 is a schematic view of a conventional color changing device. FIG. 1 ... Manifold 2 ... Flow path 9,10 ... Branching hose 11 ... Intermediate valve 16 ... Painting gun

Claims (1)

[Scope of utility model registration request] 1. Opening and closing between a paint supply path connecting a manifold in which a flow path for selectively injecting designated paints and cleaning liquids of a plurality of colors is formed and a spraying device for spraying the paint onto a work. A color changing device of the type in which an intermediate valve having an inflow port for a cleaning liquid capable of communicating with a conduction path communicating with the spraying device by a valve is interposed, and the flow path is provided at the downstream end side of the flow path of the manifold. An outlet for cleaning liquid and at least two branch valves capable of selectively communicating with the passages are provided, and the intermediate valve has the same number as the at least two branch valves and a position communicating with the communication passage. And an introduction valve that can be individually switched to a position communicating with the outside of the machine, and that each of these introduction valves and each of the branch valves are individually connected by a branch hose. Color changing device in a coating machine according to symptoms.