JPH02258076A - Dividable spray apparatus - Google Patents

Abstract

PURPOSE:To smoothly connect an atomizing head and a head support part without generating leakage even when slight misalignment is generated between respective passages provided on the sides of both members by making both members connectable by surface contact. CONSTITUTION:This spray apparatus consists of an atomizing head 1 forming a predetermined atomizing pattern while mixing coating material, an adhesive or other atomizing liquid with an air stream and the head support part 2 equipped with the respective passages of the atomizing liquid and the air stream supplied to the atomizing head 1. Contact surfaces 10a, 20a possible in surface contact are formed to the respective opposed surface regions of the atomizing head 1 and the head support part 2 over the almost entire regions of the opposed surface regions thereof and both members 1, 2 are connected in a dividable manner through said contact surfaces. As a result, even when slight misalignment is generated between the respective passages provided on the sides of both members 1, 2, both members can be smoothly connected without generating leakage.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention forms a predetermined atomization pattern by mixing an air flow with an atomization liquid such as paint or adhesive supplied to the tip of a nozzle. Spraying having an atomization head is related to an apparatus, and in particular, spraying that forms a desired atomization pattern while cooling or warming the atomization head side is related to an apparatus.

``Prior art'' Conventionally, an air cap surrounds a paint nozzle that ejects paint using pressurized force, gravity, or negative pressure, and the air flow for atomization and pattern formation is supplied from the air cap. Painting equipment called spray guns, which form a desired paint atomization pattern while ejecting the paint, are well-known. The diameter of the air hole on the side, the accuracy of the interval between the two members, etc. have a large influence, and strict accuracy control is performed on both of them.

On the other hand, due to recent technological innovations and the creation of various social demands, the spray gun is not necessarily used at room temperature, and for example, coating film formation and baking are performed in a high-temperature atmosphere in order to integrate the process. or when spraying the liquid under high-temperature radiant heat to form a film of desired particles immediately after removal from the heating furnace, or when drying and coating frozen fish at extremely low temperatures to prevent drying. etc.

In such a case, the difference in thermal expansion coefficient between the paint nozzle and the air cap may cause errors in the spacing accuracy between the two parts, which may disrupt the atomization pattern, and as a result, the finish of the painted surface may deteriorate. This will lead to defects in the product in the final process.

The quality of the atomization pattern (quality of finish) is largely determined by the concentricity of the center hole (number 31 shown in the example), which is determined by the attachment of the paint nozzle and the air cap, and the resulting balance of each air hole. Therefore, even if the nozzle base, which has the nozzle in the center and the cap is attached to the outside by a cover (annular screw), has a slight change in misalignment, the ejected airflow will be misaligned, leading to a defective pattern.

Therefore, in order to eliminate such drawbacks, when a spray gun is used in a high-temperature or low-temperature atmosphere, a fluid having heat or cooling energy is circulated within or around the gun body. There are so-called water-cooled spray guns or heated (warm) spray guns that are configured to keep the spray gun itself as close to room temperature as possible even if the spray gun is at a lower temperature, and to prevent accuracy errors caused by the coefficient of thermal expansion, etc. as much as possible. However, in the case of such a spray gun, in order to facilitate manufacturing, operability, and maintenance work, the atomizing head side including the paint nozzle and air cap, and the atomizing liquid and the atomizing liquid supplied to the atomizing head. In many cases, the head support section side having air flow passages is constructed separately so as to be connectable to each other, and the cooling or heating fluid passages are provided on the support section side.

Water-cooled guns with such a configuration are often constructed by reusing a part of a publicly known spray gun used at room temperature, but in the case of a publicly known splittable spray gun, for example, As shown in No. 83-39448, the paint and air flow passages provided on the opposing sides of the atomization door and the head support are individually fitted through tabers. It is composed of

``Problems to be Solved by the Invention'' However, in a configuration in which the passages individually contact each other only through their tapered surfaces, the efficiency of heat transfer from the head support section to the atomization head side is extremely reduced, making it difficult to cool smoothly. Not only is this not possible, but the cooling area is localized and material distortion is likely to occur.

In addition, in a configuration in which each passage section is connected to each other individually, fitting precision is required for each passage section, and even if the fitting precision is set accurately at room temperature, the atomization head and head support Differences in the heating temperatures between the parts cause misalignment, which tends to cause leakage of the paint, air flow, etc.

Furthermore, even in spray guns used at room temperature, it is quite difficult to set the fitting precision for each passage, and leakage of the paint, air flow, etc. is likely to occur.

In view of the drawbacks of the prior art, the present invention provides a method for smoothly connecting the passages provided on the atomizing head and the head support side with the same dirt floor without causing any leakage even if some misalignment occurs. The aim is to provide a spraying device that can be used.

Another object of the present invention is to make it possible to evenly cool the atomizing head and the atomizing head side even in a device that cools or heats the atomizing head while circulating fluid to the head support side, and to prevent material distortion from occurring. The purpose of spraying without is to provide equipment.

``Means for Solving the Problems'' As shown in FIG. 1, the present invention enables surface contact on the opposing sides of the atomizing head 1 and the head support section 2 over almost the entire area of the opposing parts. bonding surfaces 10a, 20a are formed, and both the members 1.2 are connected via the bonding surfaces 1ea, 20a.
It is characterized by being divisibly connected.

The bonding surfaces 10a and 20a are flat or curved bonding surfaces along a surface direction substantially perpendicular to the atomizing liquid ejecting direction, and more preferably, at least the atomizing head side is connected to the atomizing liquid ejecting nozzle (paint material ejecting nozzle). It is preferable to form the joint surface using seven flanges concentric with the central axis of the nozzle.

"Operation" According to this technical means, since the atomizing head 1 and the head support part 2 are in surface contact over almost the entire area where they face each other, the inside of the circulation passage provided on the head support part 2 side is The heat or cooling energy of the fluid flowing through the joint surface 10
It becomes possible to easily and evenly transmit the cooling or heating to the atomizing head 1 side via the atomizing head 1 side through the atomizing head 1 side, and the cooling temperature etc. can be evenly heated without being unevenly distributed. Therefore, it is possible to prevent paint or air leakage or disturbance of the atomization pattern due to thermal expansion or material type.

In particular, in a preferred embodiment of the present invention, the joint surface 10a on the side of the atomizing head l, which includes a member whose fitting accuracy is likely to be lost due to thermal distortion due to the influence of heating or cooling heat, is formed using a concentric flange. Distortion caused by thermal changes can be suppressed by the concentric flange 10, and the above effect is further improved.

In addition, since the wooden technique means that the passages are not joined together, but are joined on a plane substantially orthogonal to the liquid jetting direction, the joint surface 10a
, 2Oa, silicon O-rings and other heat-resistant seal rings 11a, 11b, ll are placed around the ends of the passages opened on the 2Oa, respectively.
By disposing c, even if misalignment or the like occurs due to a difference in heating temperature between the atomizing head l and the head support portion 2, reliable sealing performance can be ensured regardless of this.

In addition, reliable sealing performance can be ensured without particularly requiring fitting precision.1 For example, prepare multiple types of the head support part 2 side only for automatic guns, simple guns, and handguns, and Atomizing head l on the head support part 2 side
By configuring it so that it can be installed by replacing it, it is possible to make it multi-purpose, increasing its versatility.

Furthermore, the fact that the passages are joined on one side rather than between them makes processing, assembly, and maintenance easier, and since the passage joints are no longer necessary, the axial length on the atomizing head 1 side can be shortened. It is possible, and as a result, a stable slam can be obtained.

``Example'' A preferred embodiment of the present invention will be described in detail below by way of example with reference to one drawing. However, the dimensions, materials, shapes, relative positions, etc. of the components described in this example are unless otherwise specified.

This is not intended to limit the scope of the invention, but is merely an illustrative example.

1 and 2 show a water-cooled spray gun according to an embodiment of the present invention, with an air cap 3. It is composed of an atomizing head 1 consisting of a paint nozzle 4 and a nozzle base 5, and a head support part 2 that removably supports the head via a screw.

The air cap 3 is a central hole 3 that atomizes the paint ejected from the tip of the paint nozzle 4! , a pair of auxiliary holes 32 bored at opposing corners to form a pattern of the atomized paint, and a conduit 33 that guides air flow to the auxiliary holes 32 , and an annular threaded portion 34 . It is screwed onto the tip side of the nozzle base 5 through the hole.

The paint nozzle 4 is configured such that the paint supplied from the paint passage on the side of the head support portion 2 can be jetted from the paint jetting hole 41, and has a tapered outer peripheral surface and a multi-stage annular ring on the tapered surface. Grooves 42a, 42b.

42c is recessed. And the annular grooves 42a, 42b, 4
2c is the air cap 3 via the pores 43a and 43b, respectively.
The guide path 33 and the center hole 31 are configured to be able to communicate with each other.

The nozzle base 5 has a flange 10 whose base side is expanded in diameter and whose back side is flat, and a tapered opening 51 is provided on the front side of the nozzle base so that the outer peripheral surface of the paint nozzle can be seated. A center hole 52 with a thread formed along the axis is bored on the side thereof, and air passages 53, 54 communicating with the respective annular grooves are bored on both upper and lower sides of the center hole 52.

Since such a configuration is already known, a detailed explanation of its operation will be omitted.

Now, the flange lO provided at the base of the nozzle base 5 is formed concentrically with respect to the central axis of the paint nozzle 4, and a plurality of screw holes 55 are bored on the periphery side of the flange lO, and the flange lO is connected to the head support part 5 through bolts 5B. The center hole 52 and the air passages 53 and 54 are opened on the back side of the flange 910 as shown in FIG. 2(B), and the open ends 52a and 53a , 54a is recessed in a ring shape, and a heat-resistant O-ring lla is provided in the ring groove.
Ring llb and llc.

On the other hand, the head support portion 2 is also provided with seven flange 20 in the form of a concentric disk, similar to the seven flange 10 described above.

Each of the air passages 53, 5 is provided in the flange 20 parallel to the axis.
4 and the center hole 52, the air supply passage 21.23 and the paint supply passage 22 are bored, and the open ends 21a to 23a are bored.
is opened on the front side of the flange 20. Further, as shown in FIG. 2(A), cooling water circulation passages 24 and 25 are provided on both sides of the vertical line connecting the passages 21 to 23, which communicate through the vicinity of the flange joint surfaces 10a and 20a. A water flow cooled to a desired temperature is configured to be able to circulate through the vicinity of the front surface of the flange 20. Each of the above-mentioned members is made of aluminum, brass, stainless steel, or other metal material with good thermal conductivity.

According to such an embodiment, the 0 rings lla, llb, llc
Because the corresponding passages communicate with each other via the above-mentioned two members! , 2 are joined in surface contact through the joining surfaces, complete sealing performance can be ensured, and the above-described effects of the present invention can be smoothly achieved.

Although the joint surfaces 1ea and 20a may be formed into an arc shape or a hemispherical shape, the effects of the present invention will not be impaired in any way, although the entire facing portions can be in surface contact.

"Effects of the Invention" As described above, according to the present invention, since the atomizing head and the head support part are configured to be joined by surface contact, each passage provided on both member sides has the same dirt floor. Even if misalignment occurs, smooth connection can be achieved without causing leakage or the like.

Further, the present invention has various effects such as being able to provide a spraying device suitable for a device that cools or heats an atomizing head while circulating fluid in two parts of the head support portion. .

[Brief explanation of drawings]

1 and 2 show a water-cooled spray gun according to an embodiment of the present invention, FIG. 1 is a front sectional view thereof, and FIGS.
) and (C) are cross-sectional views taken along line AA' and line B-8' in FIG. 1, respectively, and showing the state of the joint surface. Figure 1 Figure 2 Patent applicant: Iwata Painting Machine Co., Ltd. No. (C)

Claims (1)

[Claims] 1) An atomization head that forms a predetermined atomization pattern while mixing paint, adhesive, or other atomization liquid with an air flow, and an atomization liquid that is supplied to the atomization head. and a head support section provided with airflow passages, wherein the atomizing head and the head support section are capable of surface contact over substantially the entire area of the opposing sides of the head support section, respectively. A spraying device characterized in that a bonding surface is formed, and the two members are separably connected via the bonding surface. 3) A fluid circulation passage containing heat or cooling energy is provided on the side of the head support portion, and the fluid flowing in the passage is a joint surface formed in a flat or curved shape along the head support portion. 4) The spraying device according to claim 1, wherein the spraying device is configured to be able to transmit heat or cooling energy to the atomizing head side via the joint surface. Flanges each having openings for the atomizing liquid and air passages are provided, and the two members are configured to be connectable via the flanges, and at least the flange on the atomizing head side is aligned with respect to the central axis of the atomizing liquid jetting nozzle. The spraying device according to claim 1), which is set concentrically.