JPH06277575A - Color change device of paint - Google Patents

Abstract

PURPOSE:To miniaturize the whole color change device by surely removing a paint stuck to a gap leading from a seat hole of a color change valve to a paint passage of a manifold serving as a paint as a paint piping with cleaning air and a washing solvent without leaving color and also narrowing a fixing pitch between color change valves. CONSTITUTION:By integrally forming a manifold part 1 constituting the paint passage 1, and a housing part 4 of the color change valve 3 forming the value seat hole 5 directly connecting to the paint passage 2 of the manifold part 1 with a synthetic resin material, etc., it is unnecessitated to provide a valve connection port communicating with the value seat hole of the color change valve at a manifold side and also it is unnecessitated to provide a flange part, etc., to screw the change value to the manifold at the color change valve side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paint color changing device for selecting a paint of a desired color from paints of various colors supplied from a plurality of paint supply sources and supplying the paint to a coating machine.

[0002]

2. Description of the Related Art In a conventional color changing device, a plurality of valve connection ports communicating with a paint passage are formed at predetermined intervals along a longitudinal direction of a manifold having a paint passage connected to a paint pipe. A color change valve, a cleaning air supply valve, and a cleaning solvent supply valve are detachably attached to the respective valve connection ports (actually, the flat valve 4).
-5254). When changing from the previous color paint to the next color paint, the operation of alternately opening and closing the cleaning air supply valve and the cleaning solvent supply valve is repeated multiple times to connect from the manifold paint passage to that passage. The previous color paint remaining in the paint pipe is removed by washing.

[0003]

However, even if such cleaning is carried out, the paint of the previous color may remain uncolored, resulting in color mixing with the paint of the next color. After investigating the cause, the paint adhering to the gap between the communication part that connects the valve seat hole of the color change valve and the valve connection port of the manifold and the seal part that seals the communication part is supplied to the paint passage of the manifold. It was found that it could not be completely removed by the use air and the cleaning solvent. Even if a small amount of pre-colored paint remains on the valve seat hole of the color change valve and the valve connection port of the manifold that communicates with the valve seat hole, it does not matter if it is dark paint such as black, red, or blue. In this case, there is a risk that the color mixes with the white next color paint and the color tone of the next color paint is significantly impaired. Therefore, it is a technical object of the present invention to ensure that the inside of the manifold of the color changing device can be cleaned without any residual color.

[0004]

In order to solve this problem, the present invention provides a paint color consisting of a manifold having a paint passage formed therein and a color change valve for sending the paint into the paint passage of the manifold. In the replacement device, the manifold portion having the paint passage and the housing portion of the color change valve having a valve seat hole directly connected to the paint passage of the manifold portion are integrally molded.

[0005]

According to the present invention, the valve seat hole of the color change valve is not connected to the paint passage formed in the manifold through the valve connection port formed in the manifold as in the conventional case, but is connected to the manifold portion. Since it is directly connected to the formed paint passage, the length of that part can be greatly shortened and at the same time,
There is no need to seal the part. Therefore,
The inside of the manifold of the color changing device can be reliably cleaned with the cleaning air and the cleaning solvent without any residual color. In addition, the color changing device that attaches the color changing valve to the valve connection port of the manifold as in the past has a flange part for screwing the color changing valve to the manifold. The mounting pitch is widened and the entire device is large, and the installation space is also large. However, if the housing part of the color change valve and the manifold part are integrally molded as in the present invention, the distance between the color change valves can be greatly increased. The entire color changing device can be narrowed and the size can be significantly reduced.

[0006]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 is a sectional view of a color changing device showing a first embodiment of the present invention, FIG. 2 is a side view of the color changing device, and FIG. 3 is a partial sectional view of a color changing device showing a second embodiment of the present invention. is there.

The color changing device shown in FIGS. 1 to 3 is a housing for a color changing valve 3 having a manifold portion 1 having a paint passage 2 and a valve seat hole 5 directly connected to the paint passage 2 of the manifold portion 1. The part 4 and the part 4 are integrally formed of a synthetic resin material having excellent electrical insulation. Further, the manifold portion 1 and the housing portion 4 are composed of a pair of upper and lower color change valves 3
3 and 3 have a common shape and structure.
The substantial difference between the first embodiment and the second embodiment is that the color change valve 3 of the first embodiment is a paint inlet 6 that serves as an inlet for the paint sent from the paint supply source, and the paint. The color change valve 3 of the second embodiment is different from the two-way valve in which the valve seat hole 5 serving as an outlet for sending out the paint flowing in from the inflow port 6 into the paint passage 2 of the manifold part 1 is formed in the housing part 4. Is a housing portion 4 in which a valve seat hole 5 and a paint inlet 6 are formed,
A housing part (30) having a paint outlet (7) for returning the paint flowing from the paint inlet (6) to a paint supply source;
Since the paint outlet 7 is opened when the valve seat hole 5 is closed, and the paint outlet 7 is closed when the valve seat hole 5 is opened, it is the same as the configuration common to both embodiments. Duplicated description will be omitted by giving reference numerals.

The color changing valve 3 is a housing portion 4 integrated with the manifold portion 1, and a cylindrical housing which is directly or indirectly fitted to the housing portion 4 via a housing portion 30 as shown in FIG. Part 8 and the housing part 8
The entire outer shell is formed by the cap-shaped housing portion 9 which is detachably attached to the housing. The housing portion 8 supports a plunger 11 having a valve body 10 for opening and closing the valve seat hole 5 at its tip end so as to be vertically slidable, and
A paint chamber 12 is formed between the housing part 4 and the housing 31 by a diaphragm 31 which is sandwiched between the housing part 4 and the valve body 19. A spring chamber 14 is formed in which a spring 13 for urging 11 in the closing direction of the valve body 10 is provided. Furthermore, inside the housing portion 8, from the connection port 15 with the air pressure source provided in the housing portion 8,
An air chamber 16 is formed in which operating air for moving the plunger 11 in the opening direction of the valve body 10 against the spring 13 is supplied.

An air outlet 17 for discharging the air in the spring chamber 14 is formed in the housing portion 9. Further, the housing portion 4 is formed with a connector portion 18 for connecting a paint pipe to the paint inlet 6, and a bolt for connecting the plurality of housing portions 4 with four bolts 19 and nuts 20. The insertion hole 21 is provided through. The head of each bolt 19 is fixed to a connector 22 for connecting a paint pipe connected to the coating machine.
9 are respectively inserted into the bolt insertion holes 21 of the housing portion 4 and tightened with the nuts 20, the connection port 2 of the connector 22
3 is connected to the paint passage 2 of the manifold portion 1 in a pressure-bonded state, and the paint passages 2 are communicated with each other by the positioning engaging projections 24 provided on each housing portion 4 (each manifold portion 1). It is designed to be connected in a line in a closed state. The housing portion 4 located at the end opposite to the connector 22 side in FIG. 2 is a housing portion for the cleaning air supply valve 25 and the cleaning solvent supply valve 26 of the same type as the color changing valve 3 shown in FIG. Has become.

However, when the coating material is supplied to the coating machine for coating, working air is supplied into the air chamber 16 from the connection port 15 with the air pressure source formed in the housing portion 8 of the color change valve 3. To move the plunger 11 in the opening direction of the valve body 10 to open the valve seat hole 5 closed by the valve body 10. As a result, the paint sent from the paint supply source flows into the paint chamber 12 from the paint inlet 6 and is sent out from the paint chamber 12 to the paint passage 2 of the manifold portion 1 through the valve seat hole 5. Then, when the painting is completed, the supply of the working air is stopped, and the plunger 1 is set by the spring 13.
1 is moved in the closing direction of the valve body 10 to close the valve seat hole 5. In addition, in the color change valve 3 of the three-way valve structure shown in FIG. 3, when the valve body 10 opens the valve seat hole 5, the valve body 1
At 0, the paint outlet 7 is closed, and when the valve body 10 closes the valve seat hole 5, the paint outlet 7 is opened so that the paint flowing from the paint inlet 6 into the paint chamber 12 remains as it is. Reflux from outlet 7 to the paint supply.

Upon completion of the coating, the operation of alternately opening and closing the cleaning air supply valve 25 and the cleaning solvent supply valve 26 is repeated a plurality of times to connect the plurality of manifold portions 1 in a row and to apply the respective paints. The inside of a series of paint passages communicating with the passage 2 is washed with washing air and a washing solvent. At this time, the paint adhering to the valve seat hole 5 of each color change valve 3 is a very short one without a seal portion formed by directly connecting the valve seat hole 5 to the paint passage 2 of the manifold portion 1 and thus washing. It is wiped off reliably with the use air and cleaning solvent, and no color residue occurs.

Further, since the housing portion 4 of the color changing valve 3 is integrally formed with the manifold portion 1, there is no need to provide a flange portion or the like for screwing the color changing valve to the manifold as in the conventional case, The interval between the color change valves 3 can be narrowed by an amount corresponding to the size of the color change device. Further, as in the embodiment, if the desired number of unit parts in which the housing part 4 of the color change valve 3 and the manifold part 1 are integrated can be arbitrarily connected with the bolts 19 and the nuts 20, the number of colors of paint can be increased or decreased. Color change valve 3 according to
The number of can be changed easily. In addition, if the housing portion 4 (manifold portion 1), 8, 9 and 30 of the color changing valve 3 is made of a synthetic resin material or a ceramic material having an excellent electric insulation property, a high voltage applied to the electrostatic coating machine can be obtained. Since there is no danger of leakage, it is possible to install the color changing device near the electrostatic coating machine. In addition, such a small and safe color changing device can be mounted on the weaving arm of the coating robot equipped with the electrostatic coating machine. In the embodiment, the two housing parts 4 are formed for one manifold part 1. However, the present invention is not limited to this, and one housing part 4 is provided for one manifold part 1.
It also includes the case of forming.

[0013]

According to the present invention, the paint remaining in the manifold of the color changing device can be reliably removed by the cleaning air and the cleaning solvent supplied into the manifold without any residual color. There is an excellent effect that the installation interval of the color changing valve can be narrowed and the entire color changing device can be downsized.

[Brief description of drawings]

FIG. 1 is a sectional view of a color changing device showing a first embodiment of the present invention.

FIG. 2 is a side view of the color changing device according to the first embodiment.

FIG. 3 is a partial cross-sectional view of a color changing device showing a second embodiment of the present invention.

[Explanation of symbols]

 1 ... Manifold part 2 ... Paint passage 3 ... Color change valve 4 ... Housing part 5 ... Valve seat hole

Claims (2)

[Claims] 1. A manifold portion (1) having a paint passage (2) in a paint color changing device comprising a manifold having a paint passage formed therein and a color changing valve for sending paint into the paint passage of the manifold. ) And the housing part (4) of the color change valve (3) having a valve seat hole (5) directly connected to the paint passage (2) of the manifold part (1) are integrally formed. A paint color changing device. 2. The color changing device according to claim 1, wherein a plurality of the manifold portions (1) are connected in a row so that the respective paint passages (2) communicate with each other.