JP3357285B2 - Attachment for air / airless - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an airless spray gun for applying a paint, an adhesive or the like, and in particular, an ON / OF in place of a spray tip of an airless gun of an airless coating apparatus.
The present invention relates to an attachment which is detachably attached after an F valve and supplies compressed air to an atomizing portion of a spray tip to enable air / airless spraying.

[0002]

2. Description of the Related Art An airless spray, which atomizes by applying a liquid pressure of about 10 MPa, is a spray method which is suitable for coating a thick film with a large amount of discharge, has little scattering of mist, and has a high coating efficiency. But,
Since the mist atomized from the spray tip cannot obtain the atomization like air spray, it is not suitable for the coating of a thin film with a cosmetic finish. Therefore, the advantages of an airless spray with less mist scattering and good coating efficiency and the advantages of an air spray that is suitable for cosmetic finishing with good mist distribution and atomization are mixed, and the particles atomized by the airless spray are compressed air. The air-airless spray method that further promotes atomization, makes the distribution of particles uniform, and adjusts the atomization shape was developed.
Air / airless spray devices have been marketed under the trade names such as air mix, air assist, and multi spray.

[0003] The above-mentioned known air / airless spraying device is an air-driven pressurizing pump for applying a liquid pressure to a coating material, and a device provided with the pump is provided with a coating material through a flexible coating hose and an air hose. The air / airless gun that supplies air and atomizes the air is set as a set. The air / airless gun is a special air / airless gun that has the functions of an airless gun and an air spray gun.It has a high hydraulic pressure channel and an air channel in the gun body, and the air channel has a mist on the gun body side. An air flow rate adjusting device for adjusting a pattern shape, which is a generalized shape, is provided.

The air / airless spray device has a relatively low cost in the market compared to the airless device and the air spray device, and has a relatively high cost due to a small production quantity. In addition, because it is limited to exclusive use,
At present, the market range is relatively narrow and it is not widely used in spite of the performance effects of the air / airless spray method.

[0005]

SUMMARY OF THE INVENTION The present invention provides an air / airless attachment that can be easily attached / detached and air / airless painted using a main body such as an airless spray gun which is relatively popular.

[0006]

SUMMARY OF THE INVENTION The present invention relates to an attachment which is used in place of a spray tip such as an airless gun for atomizing a liquid material such as a paint at a high pressure and applying it to an object to be coated. Means for mounting the paint flow path at the outlet of a valve for turning on / off a liquid material such as a high-pressure paint, a spray tip for atomizing the liquid material sent from the valve with a liquid pressure, and the liquid material to be atomized Means for detachably mounting an air cap having an air port for directing compressed air for promoting atomization and adjusting the atomized shape so as to strike atomized particles from the spray tip, wherein the compressed air is provided on the air cap. And an air flow passage communicating from the air valve to the air cap. Further, the air flow path of the attachment is branched so as to communicate with an air hole for promoting atomization of the air cap and an air hole for adjusting the spray shape, and a control valve is provided in one of the air passages for adjusting the spray shape to reduce the amount of air. Make changes possible.

Since this attachment can be screwed with a cap nut instead of a spray tip for an airless gun to a needle valve seat part at the tip of an airless gun, which is relatively popular, both spray methods of airless spray and air / airless spray are used. Can be easily changed. For example, a cosmetic finish can be performed by attaching an undercoat to a spray tip and performing airless spray painting, and then applying an overcoat to the above-mentioned attachment and air / air spraying. Also, with the above-mentioned attachment attached, and the supply of compressed air to the air / airless attachment stopped, the liquid pressure of the liquid material such as paint is reduced to 10M.
The change to the airless spray method can be easily performed by adjusting the pressure to about Pa. As a result, by utilizing the effects of the high efficiency and high coating efficiency of the airless spray method, a cosmetic finish comparable to air spray can be performed with a higher coating efficiency than air spray, and airless spray and air / airless spray The two spray methods can be easily changed at a low cost, and can be easily handled.

Further, in the conventional air / airless gun, the trigger is triggered by two fingers as in the case of the air spray gun. However, since the valve by the needle valve mechanism has the same structure as the airless gun, the trigger is used. There is also a problem that the load for pulling the finger is relatively strong and the operator's finger tends to be fatigued. However, when the triggering load is relatively strong, the structure of the airless gun that pulls with four fingers is easier to use, and the airless gun that attaches the air / airless attachment of the present invention triggers with four fingers. Since the structure is adopted and used as it is, workability is improved as compared with the conventional air / airless gun.

The attachment / detachment mechanism for the air / airless attachment of the present invention to / from the airless gun can be attached with the cap nut in the same manner as attaching the spray tip to the airless gun, and the handling is extremely simple.

Further, by attaching the air amount adjusting device 8 to the air flow path of the attachment body of the attachment, the pattern for adjusting the atomization shape can be adjusted and the function of the air / airless gun can be sufficiently satisfied.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view of an essential part in which an air / airless attachment, which is formed separately, is attached to a needle valve seat part of an airless gun. FIG. 2B is a cross-sectional view of the cap portion, showing a state in which the flow of compressed air to the air flow path 1c is stopped by the air amount adjusting device 8 in order to make the spray pattern flat, and FIG. Indicates the pattern shape at that time. FIG. 3 (B) is a cross-sectional view of the cap portion, showing a state in which the air cap 3 and the nozzle set 2 are rotated by 90 degrees with respect to FIG. 2 (A). 8, the air flow path 1
e shows a state in which compressed air is allowed to flow to the air outlet hole 1f, and FIG. 3A shows a pattern shape at that time.
FIG. 4 is a sectional view of an airless gun to which the air / airless attachment of the present invention is attached. The airless gun has various forms. The present invention can be applied to any form in which the spray tip is exchangeably attached with a cap nut. Further, the shape, dimensions, and configuration of FIG. 1 are not limited to the drawings, but include various design-changeable elements without departing from the scope of the claims.

In FIG. 1, reference numeral 1 denotes an attachment body of an air / airless attachment, 2 denotes a chipset,
3 is an air cap. Attachment body 1
A mandrel 7 for attaching with a cap nut 4 to a needle valve seat part 6 screwed to the tip of the airless gun body 5 is
The attachment body 1 is threaded through a center hole of the attachment body 1. A paint flow path passes through the center of the mandrel 7, and an air flow path 1 a for supplying compressed air to the air outlet hole 3 b of the air cap 3 is formed on the outer periphery of the mandrel 7 by a circumferential groove.
An air flow control valve 8, which will be described in detail later, is provided on an outer peripheral portion of the air flow passage 1 a. The air flow control passage 8 passes through the air flow passages 1 d and 1 e of the air cap 3 from the air flow passage 1 c via the air flow control valve 8.
f. An air valve 9 connected to an air source (not shown) is attached to the attachment body 1,
The compressed air from the air source is supplied to the air flow path 1a. The air flow path 3d branched immediately after the connection of the air valve 9 is supplied to the air flow path 3a of the air cap 3 while being airtightly partitioned from the air flow path 1d to the center.

The tip set 2 is mainly composed of a nozzle tip 10, a tip holder 11, and a tip holder 12, and the nozzle tip 10 has the same specifications as those used for airless spraying or conventional air / airless spraying. Be adaptable. A positioning pin 13 is implanted in the chip holder 11 so that the fan-shaped pattern width direction matches the air outlet hole 3b of the air cap 3. The chip set 2 is set on the air cap 3 with the directional position regulated by the positioning pins 13.
Then, it is tightened and fixed to the attachment body 1. The packing 1 is inserted between the tip holder 12 and the mandrel 7.
5 is sandwiched, and the paint flow path is hermetically sealed with the air flow path.

In the air cap 3, the central air flow from the air outlet hole 1f at the center of the air cap 3 and the side air flows from the air outlet holes 3b and 3c of the air cap 3 are partitioned and separated in the attachment body 1. The pattern width is adjusted by adjusting the air flow from the central portion by the air amount adjusting device 8. The center airflow from the air outlet hole 1f and the side airflow from the air outlet hole 3b of the air cap 3 and the flow path 3e between the chip holder 11 promote atomization of the mist atomized by the spray tip. I do. The air cap 3 is screwed to the attachment main body 1 by a cap cover 14.

[0015] The air flow rate 1d
When the flow of the compressed air to the air outlet hole 1f is stopped,
The side air flow from the air outlet hole 3b and the flow path 3e promotes the atomization of the mist atomized by the spray tip and the flattening of the spray pattern, and sprays as shown in FIGS. 2 (A) and 2 (B). The pattern becomes flat. When the air amount adjusting device 8 is opened, the atomization of the mist atomized by the spray tip is promoted by the side air flow from the air outlet hole 3b and the flow path 3e, and at the same time, the air flow path holes 1b and 1c are formed.・ 1d
-Compressed air mainly flows from 1e to the air outlet hole 1f. For this reason, the center airflow from the air outlet hole 1f promotes atomization of the mist atomized by the spray tip and circularization of the spray pattern, and the spray pattern as shown in FIGS. 3 (A) and 3 (B). Becomes circular. The spray pattern 1g shows the shape of the spray pattern when there is no center air flow.

The air amount adjusting device 8 for adjusting the pattern is screwed to the attachment body 1 in an assembled set. The air amount adjusting device 8 is mainly composed of a valve rod 16, an adjusting knob 17, and a valve retainer 18, and is provided with a spring for stabilizing a valve position, an O-ring for airtightness, and the like. The air amount adjustment by the air amount adjusting device 8 is performed by adjusting a clearance between a contact portion between the air passage hole 1b formed in the attachment body 1 through which the compressed air flows from the air passage 1a and the valve rod 16, and an adjustment knob. Turning 17 changes the opening degree of the gap and adjusts the air amount.

An air hose from an air source (not shown) is connected to the air valve 9 connected to the attachment body 1. The supply air is opened and closed by operating the handle 9a of the air valve 9. FIG. 1 shows an example in which a manually operated ball cock is used for the air valve 9. However, the invention is not limited to the manually operated ball cock, and for example, a connecting rod interlocked with the operation of the trigger 19 of the airless gun. Alternatively, a mechanism that opens and closes an air valve attached to the attachment body 1 with a wire or the like may be used.

The air / airless attachment is attached to the needle valve seat part 6 of the airless gun by the cap nut 4. Needle valve seat part 6 and mandrel 7
The airtight sheet is formed by sandwiching the packing 20 between the two and tightening with the cap nut 4. The opening and closing of the liquid flow is performed by the needle valve seat component 6 and the needle valve 24, and the attachment portion is a simple mechanism having no valve mechanism. Therefore, when airless spraying is performed, the airless spray can be performed by removing the air / airless attachment and using a normal airless gun for attaching the spray tip.

In the airless gun shown in FIG. 4, a handle 21 is screwed into the airless gun body 5, a filter 22 is inserted into a paint flow path in the handle 21, and the filter 22 can be attached and detached and cleaned by removing the handle 21. I have. A siebel joint 23 is attached to the lower part of the handle 21 to prevent the paint hose (not shown) from being twisted and to improve the operability of the gun.

In the airless gun body 5, a needle valve 24, a needle valve packing set 25, and a needle valve spring 26 for pressing and seating the needle valve 24 on the needle valve seat component 6 are set in a paint flow path passing through the center. .
And the trigger 19 for opening and closing the needle valve 24 is
It is attached to the airless gun body 5. The airless gun sends high-pressure paint to the spray tip instantaneously with high pressure, thereby suppressing the generation of spits that become coarse particles that tend to appear at the beginning of blowing. Therefore, the needle valve is pressed with a strong force against the valve seat. The needle valve spring 26 is relatively strong because the needle valve must be closed against the back pressure of the high-pressure paint applied to the needle valve 24. Therefore, the force applied to the trigger of the airless gun requires several times the force of the air spray gun. For this reason, the airless gun increases the length of the trigger 19 so that it can be pulled with four fingers. The pressure of the conventional air / airless gun is also low, but since the needle valve structure is the same as that of the airless gun, the triggering strength is higher than that of the air spray gun. Therefore, the air / airless gun is more preferably a trigger type that can be pulled with four fingers.

Since the airless gun handles high pressure, the trigger 19 is used to prevent the trigger 19 from hitting an obstacle or the like and being triggered to spray the paint, and to prevent the trigger 19 from spraying when the spray is stopped. A safety device for a safety lock 27 is provided to prevent the trigger from being easily pulled. However, since the hydraulic pressure is high even at 5 to 10 MPa, it is more desirable to provide a safety device. The air / airless attachment of the present invention is used in a form equipped with a safety device by being attached to an airless gun.

[0022]

Since the present invention is constructed as described above, it has the following effects.

Attachment body having a flow path for supplying compressed air to the tip of the airless gun and an air / airless attachment for attaching an air cap 3 having a function of promoting atomization and adjusting a pattern width to the body can be attached to and detached from the airless gun. The air and airless spray can be easily implemented at a low cost by being attached to the, and it contributes to the spread of the air and air spray which has high coating efficiency and low pollution.

By attaching the air / airless attachment to the airless gun in a detachable manner, air spray and air / airless spray can be easily performed by the same pump device, and a coating method utilizing the advantages of both sprays is possible. Become.

The safety device of the airless gun and the ease of use of the airless gun for the trigger operation with four fingers are applied as they are, resulting in an air / airless gun with good safety and easy handling.

Since the air amount adjusting device 8 is attached to the attachment itself, the adjustment can be performed in substantially the same manner as the conventional air / airless gun.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part in which an air / airless attachment of the present invention is attached to a needle valve seat part of an airless gun, and a front view of a cap portion.

FIGS. 2A and 2B are a detailed cross-sectional view of the cap portion when the spray pattern is flat and a diagram of the pattern shape, respectively.

3 is a view in which the spray pattern is rotated by 90 degrees with respect to FIG. 2, and is a detailed sectional view (B) of the cap portion when the spray pattern is circular and a view (A) of the pattern shape.

FIG. 4 is a sectional view of an airless gun to which the air / airless attachment of the present invention is attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Attachment main body 2 Chip set 3 Air cap 4 Cap nut 5 Airless gun main body 6 Needle valve seat part 8 Air flow control device 9 Air valve 14 Cap cover 19 Trigger

Claims (3)

(57) [Claims] 1. A means for attaching a paint flow path of an attachment body to an outlet of a valve for turning on / off a liquid material such as a high-pressure paint, and a spray tip for atomizing the liquid material sent from the valve by a liquid pressure. And means for detachably attaching an air cap having an air port for directing compressed air for promoting atomization of the liquid material to be atomized and adjusting the atomized shape so as to strike atomized particles from a spray tip. ,
An air / airless attachment having an air valve for supplying compressed air to the air cap and an air flow passage communicating from the air valve to the air cap. 2. The air flow path is branched in the attachment body, and one flow path is provided to an air hole for promoting atomization of the air cap, and the other is provided to an air hole for adjusting an atomization shape. 2. The air / airless attachment according to claim 1, wherein the attachment is provided so as to communicate with the air / airless. 3. The air / airless attachment according to claim 2, further comprising a compressed air air amount adjusting device for adjusting an atomized shape in a flow path of the attachment body having a flow path for supplying compressed air.