JPH0340388Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a paint spray gun that performs painting while changing the colors of paints of various colors.

[Conventional technology]

Conventionally, in order to sequentially spray different colors of paint while changing colors using a single spray gun, a color change valve device that incorporates multiple paint valves, a single thinner valve, and an air valve into a manifold has been used. and usually 4-5m
configured as a painting device consisting of a spray gun connected to the color change valve device via a paint hose,
Examples of the spray gun include an air type spray gun,
Airless spray guns, rotating atomizing head spray guns, etc. are applicable.

In order to spray paint onto the object to be coated using the coating device with the above configuration, the air valve and thinner valve of the color change valve device are used to discard the previous color paint remaining in the paint hose and spray gun. Make sure to clean these insides, then open the paint valve for the next color to supply and fill the paint hose and spray gun with the paint of the next color, and then start painting the object to be painted. I was getting used to it.

[Problem that the invention attempts to solve]

However, in the conventional technology described above, paint valves of 20 to 30 colors can be incorporated into the color change valve device, and it is suitable for construction as a large-scale painting device. On the other hand, each time a color change operation is performed, it is necessary to open the air valve and thinner valve alternately to discard and clean the previous color paint remaining in the manifold of the color change valve device, as well as in the paint hose and spray gun. As a result, there were problems in that not only was there a large loss of paint, but it also took a long time to clean, resulting in poor workability.

The present invention was developed in view of these problems in the conventional technology, and by adding a color change function for a relatively small number of colors to the head side of the spray gun body, paint loss and cleaning time can be reduced. The purpose of the present invention is to provide a simple spray gun for painting.

[Means for solving problems]

In order to solve the above problems, the present invention provides a spray gun body consisting of a head part and an actuator part, a spray port provided in the head part of the spray gun body to spray paint, and an actuator part of the spray gun body. a valve drive mechanism that is provided on the spray gun body and opens and closes the spray nozzle via a valve body that extends to the spray nozzle; and a plurality of paints that are provided on the head side of the spray gun body and supply paints of a plurality of colors to the spray nozzle. a supply passage and a plurality of paint valves for opening and closing each of the paint supply passages; a thinner supply passage provided on the head side of the spray gun body and supplying cleaning thinner toward the spray nozzle at the time of color change; and the thinner supply. It consists of a thinner valve that opens and closes the passage.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 is a spray gun main body, and the spray gun main body 1 is formed from a head portion 1A, an actuator portion 1B, and two connecting portions 1C, 1C that connect the head portion 1A and the actuator portion 1B.

2 is a paint reservoir formed in the head portion 1A; 3
The paint from the paint reservoir 2 is applied to the object to be coated (not shown).
A head cap 4 is fixed to the head portion 1A around the spray nozzle 3, and an annular air passage 5 is formed in the head cap 4. An atomizing air spray port 6 is provided, and pattern forming air spray ports 7 are provided at the upper and lower positions.

Reference numerals 8, 9, and 10 indicate three paint supply passages formed in the head portion 1A, and each paint supply passage 8,
Reference numerals 9 and 10 individually supply paint from paint tanks (not shown) for colors a, b, and c to the paint reservoir 2.

11, 12, 13 are the respective paint supply passages 8,
9 and 10 (in Fig. 1, paint valve 1 is
Among the paint valves 11 to 13, the paint valve 12 has a cylinder 12A and a cylinder 12A.
A piston 12B is slidably provided inside the piston 12B, and a needle valve body has one end fixed to the piston 12B and the other end extends from the paint supply passage 9 toward the paint reservoir 2 to open and close the paint supply passage 9. 12C, a spring 12D that always biases the needle valve body 12C in the valve-closing direction, and a spring 12D that urges the needle valve body 12C in the valve-closing direction at all times;
The paint control air passage 12E supplies a paint control air signal into the cylinder 12A to open the valve 2C. In addition, other paint valves 11,
13 also has a similar configuration.

Reference numeral 14 indicates a thinner supply passage formed in the head portion 1A, and the thinner supply passage 14 supplies thinner from a thinner tank (not shown) to the paint reservoir 2.

15 is for opening and closing the thinner supply passage 14;
The thinner valve 15 is a thinner valve provided in the head portion 1A, and the thinner valve 15 has a cylinder 15A, a piston 15B slidably provided in the cylinder 15A, and one end, just like each of the paint valves 11 to 13 described above. is fixed to the piston 15B, and the other end extends from the thinner supply passage 14 toward the paint reservoir 2 to open and close the thinner supply passage 14, and the needle valve body 15C is always oriented in the closing direction. A biasing spring 15D and a thinner control air passage 15 supplying a thinner control air signal into the cylinder 15A to open the needle valve body 15C against the spring 15D.
It is roughly composed of E.

On the other hand, 16 indicates a valve drive mechanism provided in the actuator section 1B of the spray gun main body 1, and the valve drive mechanism 16 includes a large diameter cylinder 16A and a small diameter cylinder 16B coaxially formed in the actuator section 1B, and the large diameter cylinder A sub-piston 16C is slidably provided in the cylinder 16A, one end is fixed to the sub-piston 16C, the middle part protrudes from the actuator part 1B and is inserted between the connecting parts 1C, and the other end is connected to the head part. Paint pool 2 in 1A
A valve part 16 extends from the spray nozzle 3 and detaches from this part.
_D1 , a spring 16E that normally biases the needle valve body 16D in the valve-closing direction via the sub-piston 16C, and a spring 16E that is slidably provided in the small diameter cylinder 16B and that is attached to the needle valve body 16D. A stepped main piston 16F into which the valve body 16D is loosely inserted is stretched between the main piston 16F and the sub-piston 16C so that the main piston 16F is always in contact with the valve seat 16G, Spring 16H has a smaller spring force than spring 16E.
, small diameter cylinder 16B and main piston 16F
The needle valve body 16D closes the spray port 3, and the main piston 16F is seated on the valve seat 16G. In the state shown in FIG. 1, there is a predetermined distance δ between the main piston 16F and the sub-piston 16C.

Further, reference numerals 17 and 18 indicate atomizing air supply passages; one atomizing air supply passage 17 supplies atomizing air from an air tank (not shown) to the inlet side of the valve seat 16G; One end of the atomizing air supply passage 18 opens to the outlet side of the valve seat 16G, the middle part is formed in the connecting part 1C of the spray gun main body 1 (see FIG. 2), and the other end opens to the head part 1A.
It communicates with the air passage 5 of the head cap 4 through the inside thereof.

The present embodiment is configured as described above, and its operation will be described next.

Now, assume that paint of color b is to be sprayed onto an object to be coated.

Therefore, when paint control air of color b is first supplied from the paint control air passage 12E of the paint valve 12, the piston 12B is displaced against the spring 12D, and the needle body 12C opens the paint supply passage 9. Therefore, the b color paint from the paint tank is transferred to the paint supply passage 9.
The paint is supplied to the paint reservoir 2 through the paint reservoir 2 to fill the inside thereof. Note that at this time, since the valve drive mechanism 16 is not operating, no paint is sprayed from the spray port 3.

Next, in order to start the paint work, the valve drive mechanism 16
When spray control air is supplied from the spray control air passage 16J to the pressure chamber 16I, the main piston 16F
The valve immediately moves away from the valve seat 16G against the force of the spring 16H and is displaced to the right in the figure. As a result, the atomizing air supply passages 17 and 18, which had been blocked by the main piston 16F, are brought into communication, and the respective supply passages 17 and 1
The atomizing air that has reached the air passage 5 from 8 is ejected from the atomizing air outlet 6 and is also ejected from the pattern forming air outlets 7, 7 to prepare for spraying the paint.

When the main piston 16F further displaces from the above-mentioned state and reaches a predetermined dimension δ, the main piston 16F contacts the sub-piston 16C and displaces the sub-piston 16C. As a result, the needle valve body 16D is displaced to the right in the figure, and its valve portion _16D1 opens the spray nozzle 3.

In this manner, the paint in the paint reservoir 2 is atomized from the spray port 3, atomization is promoted by the atomizing air, and the paint is formed into a pattern by the pattern forming air and applied to the object to be coated.

To finish the painting work, the paint valve 12 is closed, the supply of spray control air to the valve drive mechanism 16 is stopped, and each piston 16C, 16F is moved by the spring 16.
E, 16H may be used to return to the first state.

Next, a cleaning operation for cleaning the previous color paint b in the spray gun in order to spray the next color paint will be described.

Therefore, the thinner valve 15 is opened to supply cleaning thinner from the thinner supply passage 14. Next, the valve drive mechanism 16 is operated to open the spray nozzle 3 using the needle valve body 16D. At this time, the atomizing air supply passage 1
It is preferable to keep the main valve 7 (not shown) closed.

As a result, the previous color paint b in the paint reservoir 2 is discharged from the spray nozzle 3 to a waste liquid tank (not shown), and the interior of the paint reservoir 2, the spray nozzle 3, etc. can be cleaned. After cleaning is completed, thinner valve 15
It is sufficient to close the valve and stop the operation of the valve drive mechanism 16 in preparation for painting the next color.

In this way, since the color changing function is concentrated in the head part 1A, the cleaning part according to this embodiment is the paint reservoir 2.
Since only the inside and the spray nozzle 3 are used, it is possible to reduce paint loss as much as possible during cleaning work, reduce thinner consumption, and shorten cleaning time.

Although an air atomization type spray gun is illustrated in the embodiment, an airless type spray gun may also be used. In this case, the atomizing air outlet 6 may be omitted and only the pattern forming air outlet 7 may be provided. . It may also be an electrostatic spray gun.

Further, in the embodiment, an air valve for discharging thinner accumulated in the paint reservoir 2 after cleaning is omitted, but the air valve may be provided as necessary.

Furthermore, although three colors of paint were illustrated in the examples,
It is sufficient if it can be easily configured in a range of 2 to 5 colors.
Paint supply passages and paint valves may be arranged depending on the number of colors to be painted.

[Effect of idea]

The spray gun for painting according to the present invention is as described in detail above, and the color changing functions such as each paint valve and thinner valve are concentrated in the head part of the spray gun body adjacent to the spray nozzle, so that multiple colors of paint can be colored. Since it is constructed so that it can be painted while changing the spray gun, waste of paint and thinner is minimized, cleaning time is significantly shortened, and it can be used as a simple multi-color spray gun to great effect.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing a spray gun for painting according to this embodiment, and FIG. 2 is a cross-sectional view in the direction indicated by the - arrow in FIG. 1...Spray gun body, 1A...Head part, 1
B...actuator part, 2...paint pool, 3...
...Spray nozzle, 4...Head cap, 8, 9, 10
...Paint supply passage, 11, 12, 13...Paint valve, 14...Thinner supply passage, 15...Thinner valve, 16...Valve drive mechanism, 16D...Needle valve body, 17, 18...Atomization Air supply passage.

Claims (1)

[Claims for Utility Model Registration] (1) A spray gun body consisting of a head part and an actuator part, a spray port provided in the head part of the spray gun body to spray paint, and a spray port provided in the actuator part of the spray gun main body. is,
a valve drive mechanism that opens and closes the spray nozzle via a valve body extending to the spray nozzle; a plurality of paint supply passages provided on the head side of the spray gun body for supplying paint of a plurality of colors to the spray nozzle; A plurality of paint valves that open and close each paint supply passage, a thinner supply passage that is provided on the head side of the spray gun body and that supplies cleaning thinner toward the spray nozzle when changing colors, and a thinner supply passage that opens and closes the thinner supply passage. A paint spray gun consisting of a thinner valve. (2) The spray gun for painting according to claim (1), wherein two to five paint supply passages are formed so that the number of paint colors is two to five.