JP2002059045A - Cleaning mechanism for two-part reaction hardening type spray gun - Google Patents

Abstract

(57) [Summary] [Purpose] Immediate and automatic cleaning when returning the trigger reduces the occurrence of clogging and the like due to solidified two-liquid paint, enabling continuous and stable spraying. . Further, the operation is hardly interrupted, and the amount of thinner used for the removal operation required due to the occurrence of clogging is made extremely small. [Structure] The two-step reaction of the two-component reaction-curing spray gun triggers the trigger at a small angle,
A mechanism to discharge the cleaning thinner or air is incorporated into the spray gun so that the cleaning is performed instantaneously at each work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning mechanism for a two-part reaction curing type spray gun.

[0002]

2. Description of the Related Art A swirling flow is generated by jetting two fluids into a cylindrical mixing chamber of a two-liquid spray gun and jetting the jets out of phase with respect to the upper and lower parts of the circumference of the cylinder with a phase shift. There is a two-component reaction-curing spray gun that mixes and discharges from the tip of the gun.Cleaning such a two-component reaction-curing spray gun involves inserting a needle that can completely fill the volume in the mixing chamber and placing it in the same chamber. Either adopt a mechanical cleaning system that performs cleaning by extruding a certain material to the outside, or a thinner circuit for cleaning is connected to the mixing chamber via a valve, and this thinner is used during painting work and when work is completed. This was done by manually opening the shut off valve each time.

[0003]

However, with the two-component reaction curing type spray gun of the mechanical cleaning system, complete cleaning (scraping) cannot be performed. I was

On the other hand, in a two-component reaction curing type spray gun which employs a thinner cleaning method, the cleaning operation is interrupted and another operation is required, so that cleaning cannot be performed instantaneously. In addition, the frequency of occurrence of clogging due to delay or forgetting of the work of the worker increases. In this case, disassembly and cleaning are required and a large amount of thinner is required to remove the clog.

[0005]

Accordingly, in the present invention, a cleaning thinner or air is discharged at a position where the trigger angle is small by a two-step operation of the trigger of the two-component reaction curing type spray gun. Incorporate the mechanism into the spray gun,
Washing is performed instantly each time work is performed.

[0006]

According to the above-mentioned means, when the trigger for performing the spraying operation is triggered, the cleaning thinner or air is supplied and the cleaning is performed before the mixing and atomization of the two-component paint, and the spraying operation is terminated. When the trigger is returned, the trigger angle at which the cleaning thinner or air is supplied is the same, so that cleaning is performed by supplying cleaning thinner or air.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an overview of a two-part reaction curing type spray gun according to the present invention. The trigger 3 shown in the figure hits the needle for controlling the flow path of the pilot air at the position a, and the cleaning thinner or the air flow path is opened at the position b. Further, when the trigger 3 is pulled to the position c, the flow path of the cleaning thinner or the air is closed, and the flow path of the two-component paint is opened.

In FIG. 2, when the trigger 3 supported by the shaft 2 on the gun body 1 is pulled at a small angle (position b).
2 shows a cross section of a portion A of FIG. When the trigger 3 is pulled by a small angle to the position shown in FIG. 2, the trigger 3 pushes the needle 4 to the position shown in the figure, whereby the passage 6 closed by the seat 5 and the needle 4 is opened and the pilot air passage 7 is opened.
Is supplied from a pilot air supply port 8 through a pilot air passage 9.

The pilot air supplied from the passage 9 is
The needle 12 is supplied to the space 10 of the valve and pushes the piston 11 in the direction of the arrow so that the needle 12 separates from the seat body 13 to form a cleaning thinner or an air passage 14.

By forming the passage 14, the cleaning thinner or air supply passage 15 is connected to the supply port 16 and the passage 1.
7, 14, 18, and the mixture is supplied to the mixing chamber 20 through a passage 19 shown in the cross section along the line DD in FIG. The cleaning thinner or air supplied to the mixing chamber 20 is discharged from the nozzle 21 after cleaning the mixing chamber.

FIG. 3 is a sectional view of a portion B when the trigger 3 is pulled at a large angle to the position c.

When the trigger 3 is pulled at a large angle to the position c, the needle 4 is further pushed in from the position shown in FIG. 2, and the O-ring 22 attached to the needle 4 is joined to the seat 23, and the pilot air passage 6 Is closed.

When the pilot air passage 6 is closed,
At the same time as the pilot air in the space 10 is exhausted from an exhaust port (not shown), the piston 11 is pushed back by the spring force of the spring 44, and the needle 12 is
By being pressed against 3, the cleaning thinner or air passage 14 is closed, and the supply of the cleaning thinner or air to the mixing chamber 20 is stopped.

On the other hand, after the needle 4 hits the needle 24, the needle 24 is further pushed to open the seat 25 and the pilot air passage 26 closed by the needle 24.

When the passage 26 is opened, the pilot air supplied from the pilot air supply port 8 is supplied from the pilot air supply port 27 to the passage 28, and the pilot air is supplied to the space 29.

When the pilot air is supplied to the space 29, the piston 30 moves in the direction of the arrow in FIG.

As the piston 30 moves, the cylinder rod 31 pulls the needles 33 and 34 through the needle joint block 32 and separates from the seat bodies 35 and 36, as shown in the CC section of FIG. , Two-part paint passages 37 and 38 are formed.

By forming the passages 37 and 38, the two-pack paint is supplied to the mixing chamber 20 from the supply passages 39 and 40 of the two-paint through the passages 37 and 38, mixed, and then mixed with the nozzle. It is atomized from 21.

When ending the spraying operation,
As the pull angle of the needle 4 becomes smaller, the needle 24 is returned by the spring force of the spring 41,
When the needle 24 hits the seat 25, the pilot air passage 26 is closed.

When the passage 26 is closed, the pilot air supplied from the pilot air supply port 8 to the space 29 through the pilot air supply port 27 and the passage 28 is stopped. The supplied pilot air is exhausted, and the piston 30 is returned by the spring force of the spring 42.

When the piston 30 is returned, the cylinder rod 31 and the needle joint block 3
The needles 33 and 34 that have been pulled through the second body 2 are returned, and the passages 37 and 38 are closed by hitting the sheet bodies 35 and 36, and the two-part paint mixing chamber 20 is closed.
Supply is stopped.

Further, when the trigger angle of the trigger 3 is reduced and reaches the position shown in FIG.
The washing air or the air passage 14 is opened by the pilot air supplied to the mixing chamber, the washing mechanism is operated, and the mixing chamber 20 is opened.
Is performed.

Further, when the trigger 3 is returned and the pull angle is reduced, the pilot air passage 6 is also closed, and the supply of the cleaning thinner or air is stopped.

[0024]

According to the present invention, the washing can be performed instantaneously and automatically at the time of returning the trigger every time a painting operation is performed.
Occurrence of clogging or the like by the solidified two-component paint is reduced, and a continuous and stable spraying operation becomes possible. Therefore, there is almost no interruption of the work, and the amount of thinner used for the removal work required due to the occurrence of clogging can be extremely small.

[Brief description of the drawings]

FIG. 1 Overview of a two-component reaction curing type spray gun

FIG. 2 is a sectional view of a portion A when the trigger 3 is at a position b.

FIG. 3 is a sectional view of a portion B when the trigger 3 is at a position c.

FIG. 4 is a sectional view taken along the line CC.

FIG. 5 is a sectional view taken along the line DD.

[Explanation of symbols]

1: Gun body 2: Shaft 3: Trigger 4: Needle 5: Seat 6: Passage 7: Passage 8: Supply port 9: Passage 10: Space 11: Piston 12: Needle 1
3: Seat body 14: Passage 15: Supply passage 16:
Supply port 17: Passage 18: Passage 19: Passage 20:
Mixing chamber 21: Nozzle 22: O-ring 23: Sheet 24: Needle 25: Sheet 26:
Passage 27: Supply port 28: Passage 29: Space 30: Piston 31: Cylinder rod 32: Needle joint block 33:
Needle 34: Needle 35: Seat body 36: Seat body 37: Passage 38: Passage 39:
Supply path 40: Supply path 41: Spring 42: Spring 43: Spring 44: Spring

Continuing from the front page (72) Inventor Kenji Yoshino 1-1067-5, Kaijin-cho Nishi, Funabashi-shi, Chiba Co., Ltd. (72) Inventor Satoru Satoru Satoru 1-1067-5, Kaimin-cho Nishi, Funabashi-shi, Chiba F-term (reference) in Daiflex Engineering Laboratory Co., Ltd. 4D073 AA09 CC03 4D075 AA01 AA31 AA74 EA27 4F033 BA03 QA01 QD02 QD14 4F035 AA03 BA15

Claims (1)

[Claims] 1. A supply port for supplying a cleaning thinner or air to a mixing chamber is opened at a position where a trigger is pulled at a small angle, and further, when the trigger is pulled at a large angle, the supply port is closed and the two liquids are discharged. A supply port for supplying to the mixing chamber is configured to be opened, and when starting or ending the painting operation, the trigger is stopped at a position where the cleaning thinner or the air supply port is opened, thereby cleaning the two-liquid mixing chamber. A two-part reaction curing type spray gun that can be used.