JPH0433959Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention mixes the air ejected from the atomizing air outlet formed near the nozzle attached to the tip of the gun body with the paint ejected from the nozzle to form fine particles. The width of the paint can be increased by flattening the cross-sectional shape of the paint flow by blowing air from the pattern control air jet holes formed at a distance from the nozzle to the sides of the paint flow. This invention relates to an air adjustment device for pattern control of a painting air spray hand gun which is wide and forms a uniform coating film.

Problems to be Solved by Prior Art and Ideas Conventionally, in this type of air spray hand gun for painting, the adjustment for controlling the paint spray pattern is a needle type, and in order to open it, the adjustment knob must be turned. You have to turn it several times to open it,
The disadvantage was that the workability was poor when changing the coating width.

Means for Solving the Problems In the present invention, as a means to eliminate such drawbacks, the pattern control air supply path formed in the gun body is provided with an inflow hole with a circular cross section and a circumferential surface of the inflow hole. The opening of the outflow hole is adjusted by rotation on the outer circumferential surface of an adjustment rod whose operation part protrudes outside the gun body and is tightly and freely rotatably fitted into the inflow hole. It has a configuration in which a notch for adjustment is formed.

Function and effect of the invention When the adjustment rod is rotated by pinching the operation part, the angle of the notch with respect to the opening of the outflow hole changes, and the ratio of the outer peripheral surface of the adjustment rod blocking the opening of the outflow hole changes. The degree of opening of the opening is adjusted, which changes the degree of constriction of the pattern control air supply path, changes the jetting pressure of the air that is blown to the side of the paint stream from a position away from the nozzle, and causes the paint stream to blow out. The pattern can be adjusted by a slight rotation of the adjustment rod attached to the gun body, so the pattern can be adjusted while spraying the paint, making the adjustment process easier. This can be done extremely efficiently, and since the opening degree is not adjusted by moving the adjustment rod in the axial direction like a general variable throttle valve, the operating part of the adjustment rod does not protrude significantly from the gun body. This has the advantage that it does not interfere with the operation of the spray gun.

Embodiment Hereinafter, an embodiment in which the present invention is applied to an air spray hand gun for electrostatic painting will be described with reference to the accompanying drawings.

In the handgun of this embodiment, paint pumped under low pressure from a paint supply source (not shown) is guided through a paint inlet passage 5 in the grip 2 to a normally closed paint on-off valve 3 attached to the rear right side of the gun barrel 1. Air supplied from a compressor (not shown) is guided through the air inlet passage 6 in the grip 2 to the normally closed on-off valve 4 for air attached to the rear left side of the gun barrel 1, and the gun barrel 1 is freely swung by a support shaft 8. By pulling the trigger 9 attached to the gun, the on-off valve 3 opens and the paint is guided through the paint outflow passage 10 in the gun barrel 1 to the nozzle tip 14 screwed onto the tip of the gun barrel 1. At the same time, on-off valve 4
is opened, and air is guided to the nozzle tip 14 mainly through the air outlet path 11 for paint atomization and partly through the air outlet path 12 for pattern control.
The paint protruding from the nozzle 15 at the center of the nozzle tip 14 is atomized by air ejected from the atomizing air outlet 16 formed around the nozzle 15, and becomes a paint stream.
The high-voltage cable 1 guided into the gun barrel 1 is blown from both sides with air ejected from the pattern control air injection holes 17 formed on the periphery of the gun 4, forming an elliptical cross section.
By being negatively charged by an electrode 19 connected to a high-pressure generator (not shown) through an electrode 8, the coating is applied to a positively charged object (not shown). has barrel 1
It is separate from the air jet hole 1 for pattern control.
An adjustment device 20 is attached to adjust the jetting pressure of air jetted from 7.

This adjustment device 20 has an air on-off valve 4 integrated therein, and is formed on the outside of a cylindrical body 21, with a mounting surface 22 attached to the outside of the gun barrel 1.
The air inlet passage 6 and both air outlet passages 11 and 12 are fixed in airtight alignment to the opening mounting surface 23, and the hollow front part of the body 21 has a circular cross section and the front end face of the body 21 An open inflow hole 26 is formed, and the rear portion thereof communicates via a valve port 25 with a valve chamber 24 that communicates with an air inflow path 6 formed by opening and closing a hollow rear end surface with a screw cap 29. In front of the outflow hole 28, which is transparently provided so as to communicate the inflow hole 26 and the air outflow path 11 for paint atomization that opens in the mounting surface 23 of the gun barrel 1, there is a hole from the inner peripheral surface of the inflow hole 26 to the body. The air outlet passage 1 for pattern control has an outlet hole 30 that reaches the attachment surface 22 of the gun barrel 1 and opens in the attachment surface 23 of the gun barrel 1.
2, and the inflow hole 26
The valve rod 32 protruding from the front end surface of the body 21 is pushed in by the trigger 9, and the valve element 33 fixed to the rear end of the valve rod 32 is moved by the compression coil spring 34.
When the valve port 25 is moved to open against the biasing force in the valve closing direction, air flows from the air inflow path 6 to the valve chamber 2.
4, the air is introduced into the inflow hole 2 from the valve port 25.
6 and through each outlet hole 28, 30.
The air is supplied to the paint atomizing air outlet 11 and the pattern control air outlet 12, respectively, and the inlet 26 through which this air passes has a cylindrical center hole 41. An adjustment rod 40, which has the aforementioned valve rod 32 passed through it in an airtight manner and can freely slide and rotate, has a male thread 4 formed on its outer periphery.
2 is screwed into the female thread 27 formed at the front end of the inflow hole 26, so that the adjustment rod 40 is inserted into the body 21 with the large-diameter operating portion 43 exposed at the front of the body 21, thereby forming the circular shape of the adjustment rod 40. At the rear end portion 44,
As shown in FIG. 3, a notch 45 is formed by obliquely cutting off a semicircular portion of the end face, and this rear end 44 has an outer circumferential surface that is connected to the inflow hole 2.
The notch 45 is closely and rotatably aligned with the inner circumferential surface of the air outflow hole 30 for pattern control.
It corresponds to

The adjusting device 20 of this embodiment has the above-mentioned configuration, and when the operating portion 43 of the adjusting rod 40 is rotated, since the adjusting rod 40 is screwed into the inflow hole 26, the adjustment device 20 has the above-mentioned configuration. , the direction of the notch 45 of the rear end 44 changes, and as a result, the proportion of the obliquely cut outer circumferential surface blocking the opening 31 of the air outflow hole 30 for pattern control increases or decreases. The cross-sectional shape of the paint flow changes as the air flow rate changes depending on the opening degree and the pressure of the air ejected from the pattern control air ejection holes of the nozzle tip 14 changes. By holding the trigger 9 and turning the operating portion 43 of the adjustment rod 40 with the other hand, the pattern of the paint flow can be adjusted while observing the change in the pattern. Note that during adjustment, the adjustment rod 40 moves back and forth as the operating section 43 is turned, but since the amount of movement is extremely small, there is no possibility that the operating section 43 may hit the trigger 9. There is no risk that its operation will be hindered. Further, air for paint atomization and air for pattern control are supplied from the same outlet holes 28 and 30 that open to the inflow hole 26, but the amount of each supply is higher for the air for atomization than for pattern control. Since this amount is considerably larger than the amount of air for control, increasing or decreasing the amount of air supplied for pattern control has almost no effect on the atomization state of the paint.

4 and 5 show the notch 45 of the adjustment rod 40.
A notch 45a shown in FIG.
It is formed by notching the semicircular portion of the adjustment rod 40a so that the end surface is perpendicular to the axis, and the notch 45b shown in FIG. 5 extends the adjustment rod 40b from the rear end surface. It is formed by making a long and narrow cut along the width direction.

The present invention is not limited to the air spray hand gun for electrostatic painting as shown in the above embodiment.
It can be applied to air spray handguns for non-electrostatic painting.

[Brief explanation of the drawing]

Figures 1 to 3 of the accompanying drawings show an embodiment of the present invention, with Figure 1 being a partially cutaway side view, Figure 2 being a partially cutaway plan view, and Figure 3 being a perspective view of the adjustment rod. can be,
4 and 5 are perspective views of modified examples of the notch, respectively. DESCRIPTION OF SYMBOLS 1... Barrel, 2... Grip, 6... Air inflow path, 12... Air outflow path (for pattern control), 15... Nozzle, 16... Air outflow hole for atomization, 17... Pattern control air outlet, 20
...adjustment device, 26 ... inflow hole, 30 ... outflow hole (for pattern control air), 31 ... opening, 4
0, 40a, 40b...Adjustment rod, 43...Operation section, 42...Male thread, 44...Rear end, 45, 4
5a, 45b...notch portion.

Claims (1)

[Scope of utility model registration request] The air ejected from the atomizing air ejection hole formed near the nozzle attached to the tip of the gun body is mixed with the paint ejected from the nozzle to form an atomized paint stream, and at a position distant from the nozzle. In the air spray hand gun for painting, which flattens the cross-sectional shape of the paint stream by spraying air ejected from the formed pattern control air outlet to the side of the paint stream, the pattern control formed on the gun body air supply path for
An inflow hole with a circular cross section and an outflow hole opening on the circumferential surface of the inflow hole are formed, and an operating part is projected to the outside of the gun body and is tightly and rotatably fitted into the inflow hole. An air adjustment device for pattern control of a painting air spray hand gun, characterized in that a notch is formed on the outer peripheral surface of the adjustment rod to adjust the opening degree of the outflow hole by rotation.