JPH062760Y2 - Splittable spray gun - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention mainly relates to a spray gun for spraying a liquid such as paint. In particular, the paint supply port is located in the front part of the spray gun close to the atomizer, and is mainly used for a spray gun atomized by compressed air.

[Prior Art] A general spray gun has a structure in which an atomizing device, an adjusting device, an operating device and the like are incorporated in a main body for manufacturing reasons. As a special case, the atomizing device part including the paint passage is configured separately from the other main body part, and the body part including the atomizing device and the adjusting device and the operating device are formed because of the required material. There is one that is configured separately from the grip part including it.

The former is configured such that the nozzle base provided with the paint supply port can also be attached and detached by attaching and detaching the paint nozzle, and the position of the paint supply port can be changed. In this case, since the paint passage portion remains on the main body side, both cleanings are naturally required when cleaning.

Further, the latter is formed of a material different from that of the grip portion and is integrated by a fixing means, since the electrostatic gun mainly needs a body portion made of an insulating material.

[Problems to be solved by the invention] When a spray gun for spraying paint is used, the paint contact part including the atomizing device must be surely cleaned at the end of each work or every maintenance work, and The work was extremely troublesome. Particularly in the conventional spray gun, the entire spray gun must be washed, and if the gun body is fixed to the automatic coating machine, the entire spray gun must be removed each time. Further, there are many parts that cause troubles when the cleaning liquid is applied to the adjusting part and the operating part, and especially for those including electric control parts, it is absolutely necessary to prevent the cleaning liquid from adhering, and the cleaning is difficult.

Also, the needle valve packing provided to prevent leakage to the atmosphere from the back of the needle valve that contacts the paint nozzle at the tip and controls the paint ejection, periodically checks the wear,
It is often replaced if necessary, but the needle valve packing is narrow between the atomizer part and the rear body part,
The replacement was a difficult task.

[Means for Solving Problems] In order to solve the above problems, a paint nozzle and an air cap surrounding the paint nozzle are attached to the tip to form an atomizing device, and the rear part is provided with In a spray gun provided with a needle valve opening and closing control device for opening and closing a paint nozzle, a paint supply port communicating with a paint passage of the paint nozzle, an insertion hole through which the needle valve penetrates behind the paint passage, A spray gun front body configured by providing a needle valve packing device for sealing the outer periphery of the needle valve in an insertion hole, and a needle valve opening / closing control device for opening and closing the needle valve and the paint nozzle behind the needle valve. And a spray gun rear main body configured by disposing the spray gun, and the spray gun front main body and the spray gun rear main body are detachably connected by a detachable device. It is a thing.

In particular, the front part of the spray gun that comes into contact with the paint includes a paint supply port, a needle valve device, etc., and is configured so that the parts that require cleaning can be removed together.

It is desirable that the attachment / detachment device can be easily removed by hand,
The cover can be detached by screwing a cap nut-shaped cover that is locked to the front main body of the spray gun with a screw provided on the rear main body of the spray gun. Further, as another means, it can be detachable by a cam / clamp device provided on the outside of the gun or a clasp.

[Operation] With the above-described configuration, the compressed air entering from the introduction air port 20 is provided with the passage 21, the annular groove 13, and the atomizing air passage 14.
And is ejected from each air port of the air cap 3. At the same time, the compressed air that has entered the piston chamber 22 causes the air piston 11 to retreat against the force of the rear spring, whereby the needle valve 4 is retracted from the paint nozzle 2 and opened to eject the paint.

In case of cleaning a portion which is contaminated with paint after using the spray gun, the cover 9 is removed and the spray gun front main body 5 is separated from the spray gun rear main body 10 as shown in FIG. Minimal spray gun front body can be removed from spray gun rear body.

Embodiments The drawings show embodiments of the present invention. The atomizing device 1 comprises a paint nozzle 2 and an air cap 3, and the air cap 3 is attached to the tip of the spray gun front body 5 so as to surround the paint nozzle 2. A paint nipple 6 as a paint supply port is provided behind the atomizing device 1. The internal passage of the paint supply port communicates with the paint passage of the paint nozzle 2. Further, the paint nozzle 2
An insertion hole through which the needle valve 4 penetrates is provided at the rear of the paint passage, and a needle valve packing device 7 is provided to prevent the paint from leaking to the outside by sealing the outer periphery of the needle valve in the insertion hole. ing. A taper seat surface 8 is formed at the rear end of the spray gun front body 5, and a cap nut-shaped cover 9 is provided on the outer periphery thereof. An annular groove 13 is formed on the inner diameter side of the taper sheet surface 8, and the packing device 7 is provided in the inner center portion thereof. Annular groove 13
The atomizing air passage 14 is closed.

Next, the spray gun rear main body 10 incorporates a device for driving and operating the needle valve 4, and FIG. 1 shows an air piston 11 fixed to the rear end of the needle valve 4. The passages provided in the spray gun rear main body 10 are all compressed air passages, and the introduction air port 20, passage 21, piston chamber
There are 22 etc., and usually can be used for a long time without cleaning. An inner surface taper 12 that engages with the tapered seat surface 8 of the front body 5 is formed at the front end of the spray gun rear body 10, and a shaft sealing device 15 that holds the inner side of the annular groove 13 airtight is held inside thereof. Is configured. The air passage is opened inside the tapered seat surface 8 at a position corresponding to the annular groove 13 so as to communicate with the annular groove 13 provided in the spray gun front body 5. Also spray gun rear body 10
A screw 16 is screwed onto the outer periphery of the front end of the spray gun, and the cover 9 is screwed in to connect the spray gun front body 5 and the spray gun rear body 10. The other structures are the same as those already known as the automatic spray gun, and the details are omitted.

FIG. 2 shows the spray gun front body 5 and the spray gun rear body 10 when the cover 9 is removed to separate them, and the needle valve 4 comes out of the needle valve packing device 7 and comes out of the spray gun front body 5.

[Effect] Therefore, even if the spray gun is fixed to the automatic coating machine, cleaning can be done easily by removing only the front main body of the spray gun without removing the entire spray gun each time. No part is contaminated with cleaning liquid or adversely affected. In particular, since only the tip portion having the paint passage can be removed, the entire front part of the spray gun can be immersed in the cleaning liquid, which is extremely effective for cleaning the solidified paint and the like.

Further, since the needle valve packing device, which was relatively troublesome, is located at the rear end of the spray gun front main body, there is no obstacle behind it, and replacement work and the like are facilitated.

[Brief description of drawings]

FIG. 1 is a sectional view of a spray gun showing an embodiment of the present invention, and FIG. 2 is a sectional view when FIG. 1 is separated. 2 ... Paint nozzle 3 ... Air cap 4 ... Needle valve 5 ... Spray gun front body 7 ... Needle valve packing device 9 ... Cover, 10 ... Spray gun rear body

Claims (3)

[Scope of utility model registration request] 1. A paint nozzle and an air cap surrounding the paint nozzle are attached to the tip to form an atomizing device, and a needle valve opening / closing control device for opening / closing the paint nozzle is provided at the rear part. In the spray gun,
A paint supply port communicating with the paint passage of the paint nozzle, an insertion hole through which a needle valve penetrates behind the paint passage, and a needle valve packing device for sealing the outer periphery of the needle valve in the insertion hole are configured. A spray gun front main body, a spray gun rear main body configured by providing a needle valve and a needle valve opening / closing control device for opening and closing the paint nozzle behind the needle valve, and the spray gun front main body; A separable spray gun, wherein the spray gun rear body is detachably connected by a detachable device. 2. The spray gun according to claim 1, wherein the attachment / detachment device comprises a connecting ring connected to the front body of the spray gun and a screw provided at the front end of the rear body of the spray gun. 3. The spray gun according to claim 1, wherein the attachment / detachment device is such that the mounting position of the spray gun front body is rotatable.