JP3256632B2 - 2-pack polyester automatic gun - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of two-component coating, and more particularly to a two-component polyester automatic gun which forms a coating film by impinging a spray of a main agent on a spray of a main agent and reacting and curing the two. Are operated by one piston.

[0002]

2. Description of the Related Art In general, in a hand spray gun, a mechanism for triggering two or three needle valves by one trigger is known. For example, in a hand spray gun proposed in Japanese Patent Publication No. 4-63746, three spray heads are connected in parallel by a continuous piece, and three needle valves are integrally formed by one rod fixed to a piston. A drawing configuration is shown. However, in the method of connecting a plurality of needle valves outside the piston and pulling them together with a rod, the pulling allowance of each needle valve is unstable, and the ejection volume tends to vary, causing a problem in coating film performance. It is easy to occur and has the disadvantage of lacking durability.

[0003] Also, in an automatic gun, a mechanism for pulling an independent needle valve by a piston is known, but connecting each needle valve to a piston requires a complicated mechanism, and In addition to the necessity of increasing the size, the method of integrally connecting a plurality of needle valves outside the piston has a problem that the paint adheres when coating with two liquids such as polyester.

[0004]

SUMMARY OF THE INVENTION The present invention is based on the above-mentioned prior art, and in order to make an automatic gun capable of guaranteeing stable operation, a needle of a main agent and a curing agent is directly applied to one air piston in a gun body. An object of the present invention is to provide an automatic gun which has a simple mechanism, does not cause sticking of paint, and is easy to assemble, by slidably mounting a needle guide connected to a valve.

[0005]

SUMMARY OF THE INVENTION According to the present invention, an atomizing head having a paint nozzle for performing atomization by hydraulic pressure and an air cap attached to a tip thereof, and a gun operating portion comprising an air piston is integrally provided at a base end. The atomizing head has a paint nozzle equipped with a nozzle tip that opens a lip-shaped spout at the tip, and a hardener nozzle attached at a symmetrical position about the paint nozzle. A main material needle valve is inserted into the paint nozzle, a hardener needle valve is inserted into the hardener nozzle so as to be able to advance and retreat, respectively, and an air piston is inserted into an air chamber in the gun operating part. In the center of the main agent needle valve, a main agent needle guide connected to the main agent needle valve is slidably fitted by being urged by a needle valve spring, and the hardener needle valve and the hardener needle valve are respectively symmetrically positioned around the main agent needle guide. Linked It is obtained by inserting the agent needle guide.

Further, according to the present invention, the main needle needle guide inserted into the air piston has a rear end provided with an engaging step which comes into contact with the rear surface of the air piston, so that a time difference distance is provided between the needle step and the rear surface of the air piston. It was provided and attached.

Further, according to the present invention, a main agent needle guide inserted into an air piston is connected to a main agent needle valve movably inserted into a paint nozzle by a connecting screw, and an engagement step between a rear surface of the air piston and a rear surface of the needle guide is provided. The time difference distance formed between the first and second portions is adjustable, and a piston spring is interposed on the back surface of the air piston into which the curing agent needle guide is inserted.

[0008]

In the above construction, when air is introduced into the gun operating portion, the air piston is pulled and retracted in the air chamber, and the hardener needle guide fitted and inserted into the air piston is pulled to form a mist. The curing agent needle valve provided on the forming head is opened, and the curing agent is injected together with air from the opposed air port. At the same time as the curing agent needle guide is pulled or with a time lag, the main agent needle guide is pulled, the needle valve inserted through the paint nozzle at the tip is opened, and the main agent is sprayed hydraulically from the lip opening of the nozzle tip. Is done.
Atomized air and pattern forming air are jetted from the air port opened in the air cap with respect to the jet flow of the main agent, and collide with the air mixed with the hardener, the hardener is mixed into the main agent, and the coating film is formed. It is formed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference numeral 1 denotes an automatic gun in which an atomizing head 1a and a gun operating portion 1b are integrated into a gun body 1 'and which is attached to a gun stay (not shown) through a stay mounting hole 1c. A paint nozzle 3 having a nozzle tip 2 attached to a tip thereof and an air cap 4 are attached by a cover 5, and a main agent needle valve 6 is inserted through the paint nozzle 3 so as to be able to advance and retreat.

The air cap 4 is provided with hardener nozzles 7, 7 'at symmetrical positions with respect to the paint nozzle 3, and the hardener needle valves 8, 8' are urged by springs 9, 9 'to advance and retreat. It is freely inserted. Reference numerals 10 and 10 'denote spring receivers.

An air piston 11 is slidably fitted in an air chamber 12 in a gun operating portion 1b of the automatic gun 1. An engaging step 13a is formed at the rear end of the center of the air piston 11. The main agent needle guide 13 is slidably inserted into the back portion of the needle guide 13 by being urged by a needle valve spring 14.
15 'is provided at the rear end with stepped portions 15a, 15a' so as to be slidably fitted therein.
A single piston spring 16 is provided on the back side of the air piston 11 into which the 5 'is inserted so as to surround the needle valve spring 14, if necessary. Reference numeral 17 denotes a spring pushing lid, reference numeral 18 denotes a jam nut, and reference numeral 19 denotes a discharge amount adjusting knob. The opening degree of the main agent needle valve 6 is adjusted by adjusting the pull-off of the main agent needle guide 13 so that the discharge amount of the main agent can be adjusted. I'm sorry.

The main agent needle guide 13 inserted into the air piston 11 is integral with the main agent need valve 6 of the atomizing head 1a, and the hardening agent needle guides 15, 15 'are also hardening agent needle valves 8, 8'. Are integrally connected by connecting screws 20, 20 '.

In addition, three independent air supply ports 21a, 21b, 21c are formed at the rear end of the gun operation section 1b, and air for operating the air piston 11 is supplied to the center air supply port 21a. The air piston 11 is operated through the first air passage 22 in the gun body 1 ′ to communicate with the air chamber 12. The other two air supply ports 21b and 21c communicate with the second and third air passages 23 and 24 formed independently in the gun body 1 ', respectively, and the air cap 4 of the atomizing head 1a is provided. Has been extended to. Among them, the second air passage 23
Is injected into an air passage 23 'formed in the air cap 4 and is ejected from the air port 23a to form a pattern with respect to the jet of the main agent. 23b is the air passage 23 '
An auxiliary air port that communicates with

The air passage 25 branched from the second air passage 23 has its air port 25a cut out on both sides of the ejection port 2a of the nozzle tip 2 to open the air passage 25a. Inject air to atomize.

The third air passage 24 is provided with the air cap 4
And is mixed with the curing agent ejected from the curing agent nozzles 7 and 7 ', and is ejected from the square air port 24a at the tip.

In the figure, reference numeral 26 denotes a needle valve packing fitted in the main agent needle valve 6;
Is a packing set inserted into the main agent needle guide 13, 29 and 29 'are curing agent needle guides 15 and 15'.
A packing set 30 is inserted into the main agent inlet 30.
Is a curing agent inlet.

Next, the operation of the present invention will be described. First, the air supply ports 21a, 21b, 21c at the rear end of the gun operating portion 1b are provided.
Compressed air is supplied from an air source via independent air hoses (not shown). The air introduced into the first air passage 22 is introduced into the air chamber 12 of the air piston 11 from the air inlet 22 ′, and pushes the air piston 11 against the piston spring 16, and the rear surface 11 a of the air piston 11 The main agent needle guide 13 is pulled against the needle valve spring 14 by engaging with the engagement step 13 a of the main agent needle guide 13. When the main agent needle guide 13 is pulled,
The main agent needle valve 6 integrally connected with the valve member retreats, and the valve element 6 ′ at the tip is separated from the valve seat, whereby the main agent is hydraulically jetted from the paint nozzle 3 through the lip-shaped jet port 2 a of the nozzle tip 2. You.

The air introduced into the second air passage 23 communicates with an air passage 23 'formed in the air cap 4, and is injected from an air port 23a at the tip of the second air passage 23. Patterned air is injected against the spray flow. At the same time, the air is branched into the air passage 25 and is sprayed from the air port 25a as air for atomizing the spray of the main agent.

The air introduced into the third air passage 24 flows into the air passage 24 'and joins in front of the hardener nozzles 7 and 7' so as to be mixed with a jet of a hardener which will be described later. It is injected from the air port 24a.

Here, when the air introduced into the first air passage 22 is introduced into the air chamber 12 into which the air piston 11 is inserted and the air piston is pushed, the air is inserted into the air piston 11. The hardener needle guides 15, 15 'are pulled, the hardener needle valves 8, 8' connected to the hardener needle guides 15, 15 'are retracted, and the hardener nozzles 7, 7' are opened to open the hardener. Is injected into the air passage 24 ', mixed with air and injected from the square air port 24a.

The main material needle guide 13 and the curing agent needle guides 15 and 15 'are configured to be pulled simultaneously or with a time difference. By mounting the time interval 1 between the engagement step 13a at the rear end of the main agent needle guide 13 and the rear surface 11a of the air piston 11, the curing agent needle guide 15 is first pulled by the retraction of the air piston 11, A mixed flow of the curing agent and air is first injected from the square air port 24a, and then the air piston 1
1 between the rear surface 11a and the main agent needle guide 13
3a is engaged, the main agent needle guide 13 is pulled, and the main agent is ejected from the ejection port 2a. In addition, main agent needle guide 1
By adjusting the connection screw 20 of the main component needle valve 6 and the main component needle valve 6, the time difference 1 is eliminated so that the engagement step 13 a of the main component needle guide 13 and the rear surface 11 a of the air piston 11 abut on each other. The hardener needle guides 15, 15 'can also be pulled simultaneously.

The end of the coating is performed by stopping the supply of air to the air supply ports 21a, 21b, 21c by a solenoid valve (not shown). The air piston 11 which has been retracted due to the stoppage of the introduction of the operating air into the air chamber 12 is pushed by the needle valve spring 14 so that the engagement step 13a of the main component needle guide 13 pushes the rear surface 11a of the air piston 11, The air piston 11 advances together with the main agent needle guide 13 and returns to the original position. As a result, the valve element 6 'at the tip of the main agent needle valve 6 is seated on the valve seat, and the ejection of the main agent stops. When the air piston 11 returns to the original position, the curing agent needle valves 8, 8 'connected to the curing agent needle guides 15, 15' cause the interposed springs 9, 9 'to repel the curing agent nozzle. The nozzle openings 7, 7 'are closed, and the ejection of the curing agent is stopped.

A single piston spring 16 is interposed on the back side of the air piston 11 so as to surround the needle valve spring 14 on the back side where the curing agent needle guides 15 and 15 'are inserted. The fall of the piston 11 is prevented, and the return operation of the air piston 11 is ensured.

[0024]

As described above, according to the present invention, the main agent needle guide is inserted into the air piston, and the two curing agent needle guides are inserted respectively at symmetrical positions around the main agent needle guide. The needle valve is connected to the curing agent needle guide, and the air piston is retracted by the introduction of working air into the air chamber, so the main agent needle guide and the curing agent needle guide are pulled and stable. The needle operation can be performed as described above, and the main gun needle guide and the hardener needle guide are inserted into one air piston, so that the automatic gun has high durability.

In addition, the distance between the rear surface of the air piston and the engaging step at the rear end of the main needle guide can be adjusted so that the main agent needle guide has a time difference distance with respect to the rear surface of the air piston. Time-difference injection or simultaneous injection of the main agent and the curing agent becomes possible. Further, if the air piston is operated to such an extent that the rear surface of the air piston does not engage with the engagement step portion of the main agent needle guide, it is possible to inject only the curing agent.

Further, a single piston spring is interposed on the back surface of the air piston in which the hardener needle guide is inserted so as to surround the needle valve spring, thereby preventing the air piston from falling down. In cooperation, the return operation of the air piston can be made more reliable.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the same.

FIG. 3 is a front view of the atomizing head.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Automatic gun 1a Atomization head 1b Gun operation part 2 Nozzle tip 2a Spout 3 Paint nozzle 4 Air cap 6 Main agent needle valve 7, 7 'Hardener nozzle 8, 8' Hardener needle valve 11 Air piston 11a Rear surface 12 Air Chamber 13 Main agent needle guide 13a Engaging step 14 Needle valve spring 15, 15 'Hardening agent needle guide 16 Piston spring 20, 20' Connection screw l Time difference distance

Claims (4)

(57) [Claims] 1. An automatic gun which integrally incorporates a spray nozzle having a paint nozzle for performing atomization by liquid pressure and an air cap at a tip thereof, and a gun operating portion comprising an air piston at a base end thereof. The atomizing head has a paint nozzle with a nozzle tip that opens a lip-shaped spout at the tip, and a hardener nozzle that is attached at a symmetrical position around the paint nozzle. A valve and a curing agent needle valve are respectively inserted through the curing agent nozzle so as to be able to advance and retreat, and an air piston is inserted into an air chamber in the gun operating portion, and the main agent needle valve is located at the center of the air piston. The hardener needle guides connected to the hardener needle valves are respectively slidably fitted by being urged by a needle valve spring and slidably fitted with the hardener needle valves. Insertion 2 liquid polyester automatic gun. 2. A main agent needle guide to be inserted into an air piston has a rear end provided with an engagement step portion which comes into contact with a rear surface of the air piston, and is attached with a time difference distance between the air guide and the rear surface of the air piston. The automatic two-component polyester gun of claim 1. 3. The main needle guide inserted into the air piston is connected to a main needle valve inserted into the paint nozzle so as to be able to move forward and backward by a connecting screw, and a rear surface of the air piston and an engaging step at a rear end of the needle guide are connected to each other. 2. The automatic two-component polyester gun according to claim 1, wherein the time difference formed between the two is adjustable. 4. The two-liquid polyester automatic gun according to claim 1, wherein a piston spring is interposed on the back surface of the air piston into which the hardener needle guide is inserted so as to surround the needle valve spring.