JPH084126Y2 - Color change valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a color change valve used for color change of paint in a coating apparatus.

INDUSTRIAL APPLICABILITY The present invention can be advantageously applied to a coating booth where quick paint color change is required, particularly a tunnel type coating booth for automobiles.

(Prior Art) Generally, as many color change valves as the number corresponding to the number of paint colors are mounted on a manifold connected to a coating gun together with a thinner valve and the like. In recent years, normally, manifolds are provided on the so-called BOX side and the shortening side, respectively, and normally, paint valves that are frequently used are installed on the shortening side, and valves for other paint colors are installed on the BOX side to change paint colors. We are working to improve speed and efficiency.

In addition, it is generally preferable to use the paint in a circulating system in order to prevent sedimentation and maintain homogeneity, and particularly in the case of a metallic paint, there is a strong demand for recycling.

Therefore, conventionally, the paint feed pipe and the return pipe are arranged from the paint tank to the connection box at each work place in the painting booth,
And before that, a piping configuration was usually adopted in which two paint hoses for supply and recovery were connected to each color change valve on the BOX side and the shortening side. That is, two paint hoses were connected to each color change valve for each paint color.

As a publication describing the prior art relating to the color change valve having such a structure, there are numerous publications such as Japanese Patent Publication No. 45-40676, Japanese Patent Publication No. 47-5932, and Japanese Patent Publication No. 532.
4-29124, 62-75754, 63-63
No. 6071 can be cited.

(Problems to be solved by the invention) By the way, in recent automobile painting, there is an increasing demand for multicolor paints, and one paint unit usually uses 20 to 40 colors of paint. Therefore, it is not uncommon to use paints of nearly 60 colors.

Therefore, in one coating apparatus, the number of paint hoses, which is a multiple of the number of paint colors, that is, 40 to 80, and sometimes more than 100, is provided. Such an extremely large number of paint hoses not only complicates the structure of the coating device, but also causes great inconvenience in maintenance and maintenance of the device, and also causes an accident due to a hose connection error. Since it is easier to do this, there has been a demand for simplification of paint hoses.

The present invention has been made to meet this demand, and its purpose is to reduce the number of paint hoses to be connected, simplify the coating equipment, facilitate maintenance, and prevent accidents of connection mistakes. It is to provide a color change valve that contributes to the above and can sufficiently meet the demand for multicolor paints.

(Means for Solving the Problem) The color change valve according to the present invention is provided with the reciprocating movement of the needle valve whose valve tip is housed in the paint chamber.
In a valve for opening and closing a paint discharge port connected to the paint chamber, a hose connecting portion for connecting and fixing a double paint hose consisting of an inner pipe and an outer pipe, an inner pipe of the double paint hose and an interior of the paint chamber, In addition, a paint inflow portion and a paint outflow portion are formed which respectively connect the gap between the inner pipe and the outer pipe and the interior of the paint chamber with separate passages.

The color change valve used in the present invention has a hose connection, a paint inflow part, and a paint outflow part for circulation of paint, and other structures such as a needle valve operation mechanism are conventionally known. Alternatively, it may be a known structure. Therefore, the valve of the present invention also has a structure in which the tip of the needle valve is housed in the paint chamber, and the reciprocating movement of the valve opens and closes the discharge port leading to the paint chamber.

The hose connection part may have a structure capable of connecting and fixing the inner pipe and the outer pipe of the double paint hose,
The shape, type, etc. of each element forming the structure are not limited at all. For example, it may be a combination of a valve-fitting connection pipe that fits with the inner pipe and a connector that fixes the outer pipe to the valve body.

The paint inflow part is a passage that connects the inside of the inner pipe (or the gap between the inner pipe and the outer pipe) of the connected double paint hose with the paint chamber that houses the tip of the needle valve. Has a structure that can flow into the paint chamber from the double hose.

On the other hand, the paint outflow portion is a passage that connects the gap between the inner pipe and the outer pipe of the connected double paint hose (or the inside of the inner pipe) and the paint chamber, which is a passage separate from the inflow portion. hand,
It has a structure that allows the paint to flow from the paint chamber to the double hose.

Further, preferably, a valve structure for controlling paint circulation in the valve is provided in addition to a normal needle valve structure for opening and closing the paint discharge port. The valve structure is, for example, that the valve portion is formed at the base end side portion of the tip of the needle valve and the valve seat is formed in the valve body behind the paint chamber, and when the paint discharge port is closed, the paint return is allowed. On the other hand, the structure may be such that the discharge port is closed when it is open to prevent the paint from returning.

(Operation) According to the present invention, the color change valve can be connected to the double paint hose, and the paint is passed from the double hose (for example, inside the inner pipe) to the paint inflow part and the paint discharge port in the valve. It is possible to circulate in the order of the inside of the chamber, the paint outlet, and again the double hose (for example, the gap between the outer pipe and the inner pipe). Therefore, using only one paint hose,
It is possible to achieve paint circulation in the system path from the connection box in the paint booth to the inside of the color change valve.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

The color change valve 1 of the embodiment is used for electrostatic painting of an automobile body 30, as schematically shown in FIG. 3, and is assembled to a manifold 2 connected to an electrostatic painting gun 3. . Although not shown, a plurality of manifolds 2 are provided on each of the BOX side and the shortening side, and each manifold 2 has several to ten or more valves 1 respectively.
・ ・ Assemble.

The internal structure of the color change valve 1 is shown in FIG.
The valve 1 has a paint outlet 11 on the bottom surface of the valve body 4, a paint chamber 9 is formed inside thereof, and a needle valve 5 is provided so that the valve tip 10 can be accommodated in the paint chamber 9. . Reference numeral 19 denotes a substrate for mounting on the manifold 2. The proximal end of the needle valve 5 is connected to a piston 6, the piston 6 is slidably accommodated in a cylinder 7, and a spring 8 is interposed between the piston 6 and the cylinder 7. Further, the valve body 4 is connected to the air hose 22 by the connecting tool 24.
And the hose 22 communicates with the inside of the cylinder 7 via an air passage 23. Therefore, the piston 6 is repeatedly slid by the air pressure from the hose 22, and the needle valve 4 reciprocates up and down (in the directions of the arrows ± y), so that the paint discharge port 11 is opened and closed by the valve tip 10. Therefore, the supply and stop of the paint to the manifold 2 can be controlled.

In the valve 1 of the embodiment, as shown in an enlarged view in FIG. 2, a connecting tool 16 having a hole in the center is attached to the valve body 4.
It is screwed through the ring 31 and the connecting pipe 13 is connected.
19 It is inserted through the central hole and fixed to the valve body 4. A tip portion of the connecting tool 16 has a step portion 35 formed inside the hole and can be screwed with the fixing tool 17. Therefore, the double paint hose 12 is inserted into the hole of the connector 16 until the outer tube 20 abuts on the step portion 35, and the fixture 17 is screwed to the connector 16 via the sealing material 29, so that the hose 12 is simultaneously released. The double paint hose 12 can be connected to the valve 1 by fitting the inner pipe 21 of the above into the connecting pipe 13. The valve 1 of the embodiment has the hose connection portion with such a configuration.

Further, the valve 1 of the embodiment is formed with an inflow passage 14 as a paint inflow portion including a gap between the connecting pipe 13 and the connecting tool 16, and when the double paint hose 12 is connected, the outer pipe is formed by the passage 14. The gap 27 between the inner pipe 21 and 20 and the paint chamber 9 communicate with each other.

Further, the valve 1 has an outflow passage 25 as a paint outflow portion,
It is formed on the inner side of the paint chamber 9 so as to communicate with the inside 15 of the connecting pipe 13, and when the double paint hose 12 is connected, the inside 25 of the inner pipe 21 and the paint chamber are formed by the passage 25 and the inside 15. It is designed to communicate with 9.

The valve 1 of the embodiment is provided with a valve seat 18 having a shape adapted to the tip of the needle valve 5 on the paint discharge port 11 side, and a valve seat 28 having a shape adapted to the base end side portion of the valve tip 10. When the needle valve 5 is located at the lowest position and is formed at the inlet 36 to the outflow passage 25, the valve tip portion 10 and the valve seat 18 come into contact with each other to close the paint outlet 11, and at the same time, the inlet of the outflow passage 25. When 36 is open and the needle valve 5 moves upward, the paint discharge port 11 opens, and then the base end side portion of the valve tip 10 and the valve seat 28 abut and the inlet of the outflow passage 25 is closed. It is like this. Therefore, the paint in the paint chamber 9 flows into the outflow passage 25 except when it is supplied from the discharge port 11 to the manifold 2, and the paint circulation described later is always achieved.

In addition, as shown in FIG. 3, the double paint hose 12 described above has a paint feed pipe 33 and a return pipe 34 in the paint circulating system via a connection joint 32 on the BOX side of the paint booth.
And is connected in advance.

Then, the double paint hose 12 is connected to the color change valve 1 of the embodiment as described above, and when the paint is supplied to the valve 1, the paint is hose as shown by an arrow f in FIG.
The gap 27 between the outer tube and the inner tube 12 of 12, the inflow passage 14, the paint chamber 9, and then the outflow passage 25, the inside 15 of the connecting pipe and the inner pipe 26 of the hose 12 flow in this order, so one per color change valve The paint circulation is achieved simply by using the paint hose.

(Effect of the Invention) As described above, according to the present invention, that is, a color change valve structure that can be connected to a double paint hose and that allows paint to circulate between the double hose and the paint chamber in the valve. Therefore, it is possible to achieve paint circulation by using only one double paint hose for each color change valve for each paint color, and therefore, it is possible to reduce the number of paint hoses to be connected per coating device by half. Therefore, the structure of the entire coating apparatus becomes very simple, the maintenance of the apparatus becomes easy, and the accidents due to the hose connection mistake can be prevented.

INDUSTRIAL APPLICABILITY The valve of the present invention is particularly useful when using a metallic paint which has a particularly strong demand for recycling, and is sufficiently adaptable to the more stringent demand expected in the future regarding multicolor of paint. .

[Brief description of drawings]

FIG. 1 is a sectional view showing the inside of the color change valve of the embodiment of the present invention, FIG. 2 is an enlarged sectional view showing a part of the inside of the color change valve of FIG. 1, and FIG. It is a figure which shows schematic structure of the coating device which assembled the color change valve of the figure. In the figure, 1 ... Color change valve 4 ... Valve body 5 ... Needle valve 9 ... Paint chamber 10 ... Valve tip 11 ... Paint discharge port 12 ... Double paint hose 13 ... Connection pipe 14 ... … Paint inflow passage 15 …… Connecting pipe inside 16 …… Connector 17 …… Fixing device 20 …… Outer pipe 21 …… Inner pipe 25 …… Paint outflow passage 26 …… Inner pipe inside 27 …… Outer pipe and inner pipe Gap

Claims (1)

[Scope of utility model registration request] 1. A valve for opening and closing a paint discharge port connected to a paint chamber by reciprocating a needle valve whose valve tip is housed in the paint chamber, wherein a double paint hose including an inner pipe and an outer pipe is provided. A hose connecting part for connection and fixing, a paint inflow part for communicating the inner pipe of the double paint hose and the interior of the paint chamber, and the gap between the inner pipe and the outer pipe and the interior of the paint chamber through separate passages. And a color change valve that forms a paint outlet.