JPS5829151B2 - spray device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spraying device used in an electrostatic coating machine or the like.

Conventionally, a spray nozzle for electrostatic painting installed in this type of electrostatic coating machine has a paint nozzle installed in the nozzle body, a center injection hole for spraying liquid paint in this paint nozzle, and a center injection hole for spraying liquid paint. A very thin needle-shaped electrode is inserted into the injection hole in a floating state, and a high voltage is applied to this electrode to form an electric field. It sprays pressurized liquid paint while atomizing it, applying electrostatic coating to the object to be painted.

However, the spray nozzle for electrostatic painting with the above-mentioned configuration has a very thin electrode concentrically passed through the central injection hole and protrudes outward. When cleaning, if a worker carelessly applies external force or if the tip of the paint nozzle collides with the object to be painted during painting, the thin electrode may bend or the electrode may There were drawbacks such as eccentricity from the center of the hole, which impeded uniform spraying of the sprayed paint.

In view of the above-mentioned points, the present invention provides: - A conductive paint nozzle having a primary jet hole communicating with the primary air flow hole is fitted into a nozzle body having a blow air flow hole and a secondary air flow hole; A pair of electrode rods which are implanted in the vicinity of the secondary airflow outlet of the fluid jetting cap to be fitted and which are in electrical contact with a part of the paint nozzle are arranged to intersect on the virtual axis of the paint nozzle. The object of the present invention is to provide a spraying device which is capable of performing normal electrostatic painting without deforming even if external force is applied to each of the electrode rods due to some reason. be.

An embodiment in which the present invention is applied to a spray device for flat spraying in an electrostatic coating machine will be described below.

In FIGS. 1 and 2, reference numeral 1 denotes a nozzle body which is detachably attached to a body (also referred to as main body) 2 of an electrostatic coating machine via an adapter 3 with a nut 4. A conductive paint nozzle 5 having a spray nozzle 5a is inserted into the tapered tip opening 1a, and an inner end opening 5b of the paint nozzle 5 is connected to a charge spring 6 that applies a high voltage to the liquid paint. A supply hole 7 is provided.

Also, the nozzle body 1 located outside the supply hole 7
A primary airflow hole 8 and a secondary airflow hole 9 are formed in the adapter 3 so as to communicate with the through holes 3a and 3b of the adapter 3. It communicates with the bored primary ejection hole 10.

On the other hand, a fluid ejection cap 11 is removably connected to the nozzle body 1 by a +h nut 12 so as to slightly expose the ejection beak 5a of the paint nozzle 5.
As shown in FIG. 2, in the fluid ejection cap 11 located around the ejection beak 5a, each outlet 13 for a plurality of primary air flows communicates with the blow air flow hole 8 and the next air outlet hole 10. It is perforated.

Further, a secondary jet hole 14 is formed at the outer end of the fluid jet cap 11 so as to be inclined on the virtual axis 0 of the jet beak 5a so as to form a flat blow pattern. The secondary jet hole 14 communicates with the secondary airflow hole 9 .

Further, a pressure regulating valve 15 is screwed onto the passage connecting the secondary air flow hole 9 and the secondary jet hole 14 through an OIJ song 6 to maintain airtightness.

Therefore, by moving the pressure regulating valve 15 back and forth, the flow rate of the pressure fluid to the secondary jet hole 14 is adjusted, thereby adjusting the shape of the flat blow pattern.

On the other hand, a pair of electrode rods 17 are implanted at a position close to the secondary ejection hole 14 of the fluid ejection cap 11 with a slight deviation from the secondary ejection hole 14, and each electrode rod The inner end 17a of the paint nozzle 5 is electrically connected to the tapered portion 5c of the paint nozzle 5 so as to be electrically conductive.

Further, the free end portion 17b of each electrode rod 17 is connected to the jet beak 5a.
When a high voltage is applied to each electrode rod 17, an electric field is generated at the free end 17b of each electrode rod 17, which causes the ionization sphere or raw skin to cross. It is supposed to be done.

Therefore, when spraying paint toward an object to be painted, a high voltage is applied to the paint nozzle 5 through the charge spring 6 in advance, so that each electrode rod 17 that is in electrical contact with the paint nozzle 5 The electric field is generated by discharging to the free end 17b of the electrode.

On the other hand, when the pressurized paint is injected from the nozzle 5a of the paint nozzle 5, at the same time, by supplying pressurized fluid from the blowing air holes 8 and the secondary air holes 9, the cleaning air blowing holes 13 and The secondary airflow is ejected from the secondary ejection holes 14 to atomize the paint and form a flat spray pattern, which is applied to an object to be painted (not shown).

Further, by rotating the pressure regulating valve 15 with a fingertip, the force can be freely reduced to form a flat blow pattern.

Furthermore, even if external force is inadvertently applied to each of the electrode rods 17, there is no risk of any adverse effect on the spout 5a of the paint nozzle 5.

As described above, according to the present invention, - the conductive paint nozzle 5 having the primary nozzle 10 communicating with the first blowing air hole 8 is fitted into the nozzle body 1 having the blowing air hole 8 and the secondary air hole 9; and a fluid ejection cap 1 that fits into the paint nozzle 5.
1 with a nut 12, and this fluid ejection cap 11
A pair of electrode rods 17 which are implanted close to the secondary airflow nozzle 14 and electrically contact a part of the paint nozzle 5 are slightly biased with respect to the secondary airflow nozzle 14. Since the paint nozzle 5 is bent so as to intersect with the imaginary axis 0 of the paint nozzle 5, there is no risk that the paint nozzle 5 will cause damage to the outlet due to the needle-shaped electrode, unlike conventional devices of this type. Moreover, since each electrode rod 17 is embedded in the fluid ejection cap 11 and is in contact with the conductive paint nozzle 5, it has excellent effects such as eliminating the risk of deformation even when subjected to external force.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the spray device of the present invention, and FIG. 2 is a front view of the same. DESCRIPTION OF SYMBOLS 1... Nozzle body, 5... Paint nozzle, 6... Charge spring, 8...-Blow air flow hole, 9... Secondary air flow hole, 11... Fluid ejection cap, 12...・Prefecture Natsuto, 13...-Next-term outlet, 14...Secondary vent,
15...Pressure adjustment valve, 17...Electrode rod.

Claims (1)

[Claims] 1 - a nozzle body having an airflow hole and a secondary airflow hole; a conductive paint nozzle fitted into the nozzle body and having a primary ejection hole communicating with the blowflow hole; and a conductive paint nozzle fitted to the paint nozzle; and a fluid ejection cap connected to the nozzle body at 1 inch, and a fluid ejection cap installed slightly biased with respect to a secondary airflow ejection hole of the fluid ejection cap,
Moreover, the spraying device comprises a pair of electrode rods that electrically contact a part of the paint nozzle and are bent so as to intersect on the imaginary axis of the paint nozzle.