JPH0435232B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a nozzle device that performs atomization mixing and dispersion by ejecting a high-pressure atomization gas and two types of pumped liquid from respective nozzle holes by operating a trigger.

Conventional technology Conventionally, in nozzle devices that apply pressure to the liquid and forcefully send it to the nozzle hole, such as in pressure-feeding spray guns for paint, there are nozzle devices that have a structure that sprays only one type of liquid (paint in the case of painting). something is being used.

OBJECT OF THE INVENTION Accordingly, an object of the present invention is to provide a nozzle device that is inexpensive, simple, and easy to operate and can atomize and mix and disperse two types of liquids (for example, a main agent and a curing agent in two-component coating). It is about providing.

Structure of the Invention According to the present invention, the present invention includes a spray gun, a handle, and a trigger, and uses high-pressure gas ejected from the gas ejection nozzle hole of the spray gun to finely disperse the liquid ejected from the liquid ejection nozzle hole of the spray gun. A first on-off valve is provided in a high-pressure gas flow path that communicates from a high-pressure gas supply hole formed in the handle to the gas jet nozzle hole, and a first on-off valve is provided alongside the first on-off valve, and when the high-pressure gas is opened, the high-pressure gas is A second supplying part of the high pressure gas from the gas flow path to the working fluid path of the pressure switch.
an on-off valve, and first and second valve actuations that sequentially engage the trigger in accordance with a pulling operation of the trigger and open the first on-off valve and the second on-off valve after a delay time. and a pressure switch that is actuated by high pressure gas supplied from the working fluid path when the second on-off valve is opened, and starts supplying liquid from the liquid pump to the liquid jet nozzle hole. and an axially movable closing needle that opens a liquid communication path from the liquid pump to the liquid ejection nozzle hole in conjunction with the pulling operation of the trigger;
an exhaust port that opens when the second on-off valve returns and closes, and discharges the remaining high-pressure air in the working fluid path of the pressure switch to the outside of the device; In the nozzle device configured to include return means for sequentially returning and closing the first on-off valve, the above-mentioned liquid ejection nozzle hole is formed from two separate liquid ejection nozzle holes, and the above-mentioned liquid ejection nozzle hole is formed from two separate liquid ejection nozzle holes, and The axially movable closing needle is formed of two needle members that open and close the two liquid jet nozzle holes according to the pulling and returning operations of the trigger, and atomizes the two types of liquids by jetting out high-pressure gas. Provided is a nozzle device characterized in that it is configured to mix and eject.

Function and Effect of the Invention Particularly recently, with the spread of two-component paints for low-temperature drying such as urethane and epoxy paints, the main ingredient and curing agent of these two-component paints are sprayed out from individual nozzle holes just before painting. A nozzle device for atomizing, mixing and dispersing particles is required, and the amount of pressure fed to the nozzle holes on both sides must always be kept at a constant mixing ratio. However, using the above-mentioned nozzle device according to the present invention, by operating the trigger, The high-pressure gas pressure for atomization is applied to the pressure switch, and power is supplied to and activated the two liquid pumps that pump appropriate amounts of the main agent and curing agent, respectively, and the main agent and curing agent are supplied to the respective jet nozzle holes. The pressure acting on the pressure switch can also be removed by operating the trigger to stop each liquid pump.

In addition, by setting the operating pressures of the two pressure switches to be different in advance, and using the pressure difference from the time when the pressure of high-pressure gas starts acting on these pressure switches until it rises to a constant high pressure value, both pressure switches can be operated. By shifting the operation timing of the curing agent, the curing agent with a small mixing ratio is first forced and ejected, and then the base agent with a large mixing ratio is ejected under pressure, thereby preventing a shortage of curing agent at the start of ejection mixing of both agents. In addition, when the nozzle device stops operating, it is possible to first stop the supply of the main agent and then stop the supply of the curing agent after a delay time, thus preventing a curing agent shortage at the time of stoppage and maintaining good mixing. .

Embodiment Next, an embodiment of the present invention will be described in detail based on the accompanying drawings. FIG. 1 is a sectional view and a paint supply circuit diagram showing an embodiment of the nozzle device of the present invention, which is used when painting plastic parts such as automobiles with a two-component urethane paint.

FIG. 2 is a rear view of the spray gun of the nozzle device, and FIG. 3 is a partial sectional view taken along the line of the spray gun.

Now, in FIG. 1, A is a manually operated spray gun. A high-pressure air supply hole _H1 for atomizing the liquid, that is, paint, and a high-pressure air supply hole _H2 for operating the pressure switch pass through the handle 1, respectively.

When the trigger 2 is manually pulled toward the handle 1, the first air valve 3 moves the outer end of the valve operating rod 4, which is attached to the inner end and extends outward, against the spring pressure of the spring 5. When the air valve 3 is opened by pressing the air valve 3, the high-pressure air _G1 flows into the cylinder 7, which is integrally formed coaxially with the threaded cylinder 6 that seals and supports the valve actuating rod 4, and has a plurality of through holes in the peripheral wall 7a. and passes through passages 21, 22, 23 formed inside the spray gun A to a plurality of atomization and mixing air jet nozzle holes _H5 ,
Ejected to the outside from H ₆ and H ₇ . Also, rotate the knob 25 of the screw needle 24 to open the air hole _H14.
When is opened, a part of the high pressure air G ₁ is also ejected to the outside from the atomization and dispersion pattern adjustment ejection nozzle holes H ₃ and H ₄ . Next, when the trigger 2 is pulled further toward the handle 1, the trigger 2 moves the outer end of the actuating valve rod 9 of the second air valve 8 from the position where it engaged with the outer end of the valve actuating rod 4 to the spring 10. Apply spring pressure to open the air valve 8. Therefore, a portion of the high-pressure air _G1 becomes high-pressure air _G2 and passes through the cylinder 12, which is integrally formed on the coaxial extension of the threaded cylinder 11 that seals and supports the valve actuating rod 9, and has a plurality of through holes in the peripheral wall 12a. and high pressure air supply hole _H2 for pressure switch operation.
is supplied to the pressure switch operating air path R via
Pressurize pressure switches SW ₁ and SW ₂ .
Therefore, by operating both pressure switches SW ₁ and SW ₂ ,
Electric motor M ₁ of hardener pump P ₁ and base agent pump P ₂
The electric motor M ₂ starts operating. As a result, the curing agent and the base agent are pumped and supplied to the respective supply holes H ₈ and H ₉ of the spray gun A. Both drugs thus pumped and supplied are
It penetrates the trigger 2 and is opened by the movement of the needle 13, which is provided to move in the axial direction in conjunction with the engagement of the shoulder portion 13a, and the needle 14, which has a similar interlocking structure. spout hole
H ₁₀ , H ₁₁ , H ₁₂ (see Figures 2 and 3) are ejected to the outside, and the air is atomized and mixed by the air that is ejected to the outside from air ejection nozzle holes H ₃ to _{H 7} first. It is applied to the surface to be coated by dispersion.

In addition, in the above, one pressure switch SW ₁
The operating pressure of the pressure switch SW ₂ is set lower than that of the other pressure switch SW 2, and when high pressure air G ₂ begins to be supplied to the pressure switch operating air path R, the pressure switch SW ₁ is operated first, and then the air When the pressure in path R increases over time, the pressure switch is activated with a delay.
SW ₂ is activated. That is, two pressure switches
SW ₁ and SW ₂ are operated with a time difference. Therefore, pump P ₁ is operated first to spray the curing agent to the outside from the nozzle hole H ₁₀ of spray gun A, and then pump P ₂ is operated to spray the hardening agent to the outside. A time delay method is adopted in which the water is ejected and dispersed from the external dispersion hole _H12 through the ejection hole _H11 . By ejecting the curing agent first in this manner, it is possible to prevent the curing agent having a small mixing ratio from becoming insufficient with respect to the main ingredient having a large mixing ratio when ejecting at the start of coating. Return trigger 2, which was pulled during painting, to its original initial position.
That is, when the valve actuating rod 9 is moved in the direction away from the handle 1 and the pressed valve actuating rod 9 is returned to its original position by the return spring force of the spring 10, the high pressure air in the pressure switch actuating air path R is first released. G ₂ is cylinder 1
2, the air is exhausted to the outside from the exhaust hole H ₁₃ through a gap provided between the connecting rod 15 connecting the air valve 8 and the valve operating rod 9 and the threaded cylinder 11 for sealing support. , the pressure inside the air passage R decreases. As a result, first, the pressure switch _SW2 returns to the non-operating state (off), stops the base material pressure pump _P2 , and stops spraying and dispersing the base material from the external dispersion hole _H12 . Next, when the pressure in the air passage R further decreases, the other pressure switch _SW1 turns off, stopping the ejection of the curing agent from the ejection hole _H10 .

As described above, by first stopping the ejection of the base agent with a high mixing ratio, it is possible to prevent the curing agent with a low mixing ratio from running out at the end of painting.

The exhaust hole _H13 is maintained in a closed state by the sealing fit between the valve actuating rod 9 and the packing 16 while the valve actuating rod 9 is pressed by the trigger 2. The high pressure air of will not leak from the exhaust hole _H13 .

Even when the spray gun A stops spraying and dispersing the main agent and curing agent, high-pressure air is still being sprayed from the spray nozzle holes _H3 to _H7 , and the air is being sprayed around the spray hole _H10 and the external dispersion hole _H12 . It blows off any remaining adhesive and performs a cleaning action, preventing clogging.

When trigger 2 is completely returned to its original position,
The valve operating rod 4 returns to its original position, the air valve 3 is closed, and all operations of the nozzle device are stopped.

The trigger 2 and pressure switches SW ₁ and SW ₂ of the spray gun A in FIG. 1 are shown in their non-operating positions.

As is clear from the above description, by using the nozzle device according to the present invention, two liquids can be ejected and stopped with a time difference just by operating the trigger, and a nozzle device that is extremely simple, safe, and highly efficient can be obtained. be able to. Of course, if necessary, the two liquids can be ejected or stopped simultaneously by adjusting the lengths of the valve actuating rods 4 and 9 so as to synchronize the actuation timing of the trigger 2.

It goes without saying that the nozzle device of the present invention can be used not only for the purpose of painting according to the above-mentioned embodiments, but also as a nozzle device for spraying food, spraying chemicals, and the like.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the mechanism and fluid circuit showing the overall configuration of an embodiment of the nozzle device according to the present invention, and FIG. 2 is a diagram of the nozzle device shown in FIG. 1.
FIG. 3 is a rear view taken along the line, and FIG. 3 is a partial sectional view taken along the line -- in FIG. 1 of the same nozzle device. DESCRIPTION OF SYMBOLS 1... Handle, 2... Trigger, 3... First air valve, 4... Valve operating rod, 8... Second gas valve, 9
... Valve operating rod, 13, 14 ... Needle, A ...
Spray gun, H ₃ , H ₄ , H ₅ , H ₆ , H ₇ ... High pressure air jet nozzle hole, H ₁₀ , H ₁₁ H ₁₂ ... Liquid jet nozzle hole, H ₁ ... High pressure air supply hole , SW ₁ ,
SW ₂ ... Pressure switch, P ₁ , P ₂ ... Liquid pump.

Claims (1)

[Scope of Claims] 1. A spray gun having a handle and a trigger, which uses high-pressure gas ejected from a gas ejection nozzle hole of the spray gun to atomize and disperse liquid ejected from a liquid ejection nozzle hole of the spray gun. a first on-off valve in a high-pressure gas passage communicating from a high-pressure gas supply hole formed in the handle to the gas ejection nozzle hole; a second on-off valve that supplies a portion of the high-pressure gas from the passage to the working fluid path of the pressure switch; and a second on-off valve that sequentially engages with the trigger in response to a pulling operation of the trigger to open and close the first on-off valve and the second on-off valve. first and second valve operating rods that open the valve after a delay time; and a switch that is operated by high-pressure gas supplied from the operating fluid path when the second on-off valve is opened. , a pressure switch that starts liquid supply from the liquid pump to the liquid ejection nozzle hole, and an axial closing needle that opens a liquid communication path from the liquid pump to the liquid ejection nozzle in conjunction with a pulling operation of the trigger. , an exhaust port that opens when the second on-off valve returns and closes, and discharges the remaining high-pressure air in the working fluid path of the pressure switch to the outside of the device; and a return means for sequentially returning and closing the first on-off valve, wherein the liquid ejection nozzle hole is formed from two adjacent separate nozzle holes, and the axially movable closing needle is configured to include: It is formed of two needle members that open and close the two nozzle holes according to the pulling and returning operations of the trigger, and the two types of liquids are ejected from the two liquid ejection nozzle holes and atomized by the high-pressure gas. A nozzle device characterized by mixing and dispersing. 2. In the nozzle device according to claim 1, the two separate liquid ejection nozzle holes are connected to the liquid pumps each consisting of two different pumps, and the pressure switch connects the two liquid pumps. A nozzle device comprising two pressure switches having different operating pressures so as to be operated with a delay time, and the ejection start timing and ejection stop timing of the two types of liquids are staggered. 3. The nozzle device according to claim 1, wherein the return means is formed of two compression springs, one end of which is engaged with the first and second on-off valves, respectively.