JP3177609B2 - Double head airless gun - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-headed airless gun used for painting a two-part waterproofing material for a building in which a main agent and a curing agent are jetted at a hydraulic pressure.

[0002]

2. Description of the Related Art A spray gun using a two-component paint, which mixes and sprays a spray of an auxiliary agent such as a curing agent with a spray of a main agent in front of a spray opening of the spray gun, has conventionally been a double-head spray gun or a double-head spray gun. Known as a two-head spray gun.
For example, it is disclosed in Japanese Utility Model Publication No. Sho 59-20364 and Japanese Utility Model Publication No. Sho 58-35319 proposed by the applicant.
These spray guns are so-called air spray guns that use compressed air to spray and atomize the main agent and auxiliary agent, apply high pressure to the coating material of the main agent and auxiliary agent, and spray by spraying from the nozzle with liquid pressure. There are no double-headed guns in airless guns.

[0003] When applying a building waterproofing material that ejects a high-viscosity coating material, since a single thick coating drips, it is necessary to apply the coating material once with an airless gun that sprays the coating material and then obtain a predetermined film thickness. Again, the two steps of spraying the coating material were adopted, but due to the uneconomical time required for coating, a two-component waterproofing material for the building was developed, and a known airless gun was used for blowing the main agent and the hardening agent. A method is adopted in which the head is connected and fixed with a stay, and the two liquids are contact-mixed in the air and applied to form a waterproof film.

[0004]

However, when two airless guns are used in a fixed state, the trigger load and the operation are doubled because of two triggers. Further, since the mixing ratio of the two liquids at the beginning and end of blowing of the airless gun becomes unstable, it is necessary to throw away. Furthermore, since the two airless guns are fixed, the position of the intersection of spraying the two liquids cannot be easily adjusted, so that it is possible to cope with a change in the spraying distance, resulting in poor workability.

Accordingly, the present invention combines a hand airless gun that sprays a main agent with an auto airless gun that sprays a curing agent, and operates both airless guns in stages only by operating the trigger of the hand airless gun. An object of the present invention is to provide a double-headed airless gun that stabilizes the mixing ratio of two liquids, improves operability, and has good workability.

[0006]

According to the present invention, an automatic airless gun for injecting a curing agent is mounted at a position directly beside a hand airless gun for injecting a main agent so as to be capable of adjusting the injection angle, and is provided in an air valve chamber of the hand airless gun. The air pipe extends from the communicating passage of the communicating compressed air to the outside, and is connected to an air pipe communicating with the air piston chamber of the auto airless gun.
The air piston of the auto airless gun is operated by the trigger operation of the second stage to inject the hardener, and the main agent is injected by the hand airless gun by the second operation of the trigger to contact the outside, The compressed air supplied to the air piston chamber of the automatic airless gun is discharged to the outside through the hollow passage of the air valve behind the air valve facing the air valve chamber of the hand airless gun. A vent hole is provided.

[0007]

1 and 2 schematically show the appearance of a double-headed airless gun 1 according to the present invention. An automatic airless gun 3 for injecting a curing agent right next to a hand airless gun 2 for injecting a main agent is shown. The stay 4 is connected so as to be capable of adjusting the injection angle, and extends from a communication passage of the compressed air communicating with the air valve chamber inside the hand airless gun 2 as described later. Air pipe 5 that communicates and sends out air for air piston operation
Are connected to form a double-headed airless gun 1.

FIG. 3 shows a cross section of the hand airless gun 2. The hand airless gun 2 has a paint nozzle 7 having an injection port 6 at its tip. A needle valve 8 is inserted into the gun body 2 ′, moved forward and backward by a trigger 9, and connected to an outlet 7 ′ of the paint nozzle 7. It is configured to open and close. Further, in conjunction with the operation of the trigger 9, the air valve 11 in the air valve chamber 10 provided in the gun body 2 'retreats against the air valve spring 12, and the grip 13
The compressed air introduced into the air passage 14 formed in the air passage 14 is moved from the air valve chamber 10 to the communication passage 1 by the first stage of the trigger 9.
Air is introduced into the air piston chamber 16 of the auto airless gun 3 by the air pipe 5 formed outside the gun body 2 ′ via 4 and 14 ′, and the curing agent is sprayed first from the auto airless gun 3 as described later. .

In the operation of the second stage for the trigger 9,
The needle valve 8 retreats, and the main agent introduced into the paint nozzle 7 from the paint nipple 15 is ejected to the outside from the ejection port 6 at the tip by hydraulic pressure. The jet flow of the hardener injected from the auto airless gun 3 crosses the jet flow of the main agent in front of the injection axis of the main agent, and the main agent and the hardener are mixed and applied to the object to be coated.

FIG. 4 shows a cross section of the automatic airless gun 3. As described above, the other end of the air pipe 5 extending from the air communication passage 14 'of the hand airless gun 2 is inside the side of the automatic airless gun 3. Is introduced into the air piston chamber 16, and the air piston 17 is retracted against the piston spring 18, whereby the needle valve rod 19 having the rear end fixed to the air piston 17 is pulled, and the needle valve 20 at the tip is hardened. The hardener introduced from the hardener nipple 24 below the tip of the auto airless gun 3 is ejected outside from the outlet 22 of the nozzle 21 by the liquid pressure from the injection port 23 of the hardener nozzle 21.

Reference numeral 25 denotes the air valve chamber 1 of the hand airless gun 2.
0 is a deaeration hole formed at the rear end (see FIG. 5), and opens to the outside at the rear end of a hollow passage 11 ′ formed inside the air valve 11. 11a is the entrance of the hollow passage, and 11b is the exit. When the air piston 17 of the automatic airless gun 3 is closed with the trigger 9 returned, the deaeration hole 25 allows the compressed air introduced into the air piston chamber 16 to flow back through the air pipe 5 and into the hand airless gun 2. The air is returned to the air valve chamber 10 through the hollow passage 11 'of the air valve 11 to the outside from the rear end. That is, the deaeration hole 25 is configured to communicate with the air valve chamber 10 via the hollow passage 11 ′ of the air valve 11 with the trigger 9 returned. Reference numerals 26 and 27 are O-rings for preventing leakage.

In the drawing, reference numeral 28 denotes an air nipple attached to the grip of the hand airless gun 2, 29 denotes an air amount adjusting valve, 30 denotes a piston rod connected to the air valve 11, and 31 denotes a needle valve spring.

Next, the operation will be described. When the trigger 9 of the hand airless gun 2 is pulled by the first stage pulling amount (FIG. 6).
), The air valve 11 retreats in the air valve chamber 10,
The compressed air introduced from the air nipple 28 of the grip 13 is introduced into the air valve chamber 10 and further communicates with the communication passages 14 and 14 ′.
Is introduced into the air piston chamber 16 of the automatic airless gun 3 connected by the air pipe 5 through the air pipe 5, the air piston 17 is retracted, and the needle valve 20 is pulled.
The curing agent introduced from the curing agent nipple 24 is ejected to the outside from the ejection port 23 of the tip of the curing agent nozzle 21 by liquid pressure. In this case, the mounting angle of the automatic airless gun 3 is adjusted by adjusting the parallel pin 32 provided on the stay 4 so that the injection axis of the automatic airless gun 3 crosses the injection axis of the hand airless gun 2 in front. ing.

Next, by pulling the trigger 9 of the hand airless gun 2 for the second stage, the needle valve 8 is retracted, and the main agent introduced into the paint nozzle 7 from the paint nipple 15 is ejected at the tip. The liquid is ejected to the outside from the port 6 by a liquid pressure, crosses and collides with the jet of the hardener jetted from the jet port 23 of the auto airless gun 3, and the mixed liquid of the main agent and the hardener is applied to the object. .

Further, by returning the trigger 9 of the hand airless gun 2 upon interruption or termination of the coating, the needle valve 8 closes the outlet 7 'of the coating nozzle 7 and the injection of the main agent is stopped. When the supply of the compressed air introduced into the air piston chamber 16 of the automatic airless gun 3 is stopped, the air piston 17 is returned to the original position by the repulsion of the piston spring 18 and the hardener nozzle 21 is closed. It is closed at 20, and the injection of the curing agent is stopped.

When the air valve 11 of the hand airless gun 2 is closed, the compressed air supplied to the air piston chamber 16 of the automatic airless gun 3 passes through the air pipe 5 in the opposite direction to the supply, and the hand airless gun 3 2 air valve room 1
The compressed air that has flowed back to 0 passes through the hollow passage 11 ′ in the air valve 11 that faces the air valve chamber 10, and is discharged to the atmosphere through a deaeration hole 25 that opens at the rear end.

[0017]

As described above, in the double-headed airless gun of the present invention, an auto airless gun for injecting a curing agent is mounted at a position right beside the hand airless gun for injecting the main agent so that the injection angle can be adjusted by a stay so that the air of the hand airless gun can be adjusted. To operate both airless guns by only triggering the hand airless gun by connecting the air pipe communicating with the air piston chamber of the auto airless gun to the outside through the communication path of the compressed air communicating with the valve chamber Reduces trigger load and improves operability. In addition, since the injection angle of the auto airless gun can be freely adjusted by the stay on the hand airless gun, it is easy to adjust the intersection point of the two liquids of the injected main agent and the curing agent, and can quickly respond to changes in the spraying distance. .

Further, in the present invention, the triggering operation of the hand airless gun is performed in two stages, and the air piston of the automatic airless gun is actuated by the trigger of the first stage to inject the curing agent, and the second stage is operated. The main agent is ejected from the hand airless gun at the trigger, and the two components of the main agent and the curing agent are mixed and stabilized because they are contacted and mixed externally, and the coating film performance is improved.

Further, according to the present invention, when the trigger is released, a deaeration hole for discharging compressed air flowing backward from the auto airless gun to the outside is provided behind the air valve facing the air valve chamber of the hand airless gun. The deaeration mechanism is simplified by communicating the deaeration hole through the hollow passage of the valve.

[Brief description of the drawings]

FIG. 1 is a front view of a double-headed airless gun according to the present invention.

FIG. 2 is a plan view showing a cross section of a part of the double-headed airless gun of the present invention.

FIG. 3 is a vertical sectional view of the hand airless gun of the present invention.

FIG. 4 is a longitudinal sectional view of the automatic airless gun of the present invention.

FIG. 5 is an enlarged sectional view of a main part of the hand airless gun of the present invention.

FIG. 6 is a cross-sectional view of a main part of the hand airless gun according to the present invention in a state where a trigger is pulled to a first-stage trigger;

FIG. 7 is a cross-sectional view of a main part of the hand airless gun according to the present invention in a state where a trigger is pulled to a second stage trigger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Double head airless gun 2 ... Hand airless gun 3 ... Auto airless gun 4 ... Stay 5 ... Air pipe 7 ... Paint nozzle 8 ... Needle valve 9 ... Trigger 10 ... air valve chamber 11 ... air valve 11 '... hollow passage 14, 14' ... communication passage

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B05B ⁷ /00-7/32 B05B 9/01 B05D 1/02

Claims (3)

(57) [Claims] An auto airless gun for injecting a curing agent is provided at a position directly beside a hand airless gun for injecting a main agent so as to be capable of adjusting a spraying angle, and a compressed air communication passage communicating with an air valve chamber of the hand airless gun. A double-headed airless gun that extends outside and connects an air pipe that communicates with the air piston chamber of the auto airless gun. 2. An auto airless gun for injecting a curing agent is provided at a position directly beside a hand airless gun for injecting a main agent so as to be capable of adjusting an injection angle, and a compressed air communicating passage communicating with an air valve chamber of the hand airless gun. An air pipe extending to the outside and connected to the air piston chamber of the auto airless gun is connected, and the hand airless gun is triggered in two stages. A double-headed airless gun in which the air piston is operated to inject a curing agent and the main agent is ejected from a hand airless gun by a second-step trigger operation, and is contacted and mixed externally. 3. A deaeration hole is provided behind the air valve facing the air valve chamber of the hand airless gun to discharge compressed air supplied to the air piston chamber of the automatic airless gun to the outside through the hollow passage of the air valve. The double-headed airless gun according to claim 2.