WO1990007384A1 - Atomization method and atomizer - Google Patents

Abstract

This invention relates to an atomization method for feeding an atomizing material into jet air and for making atomization, which comprises jetting a pair of planar jet air flows towards the center shaft of atomization material supply means for supplying, under non-atomization state, atomization materials consisting of a fluidizable material such as a metal molten droplet fused by arc heat, paint, blast material, adhesive, powder, etc, while interposing the center shaft between the pair of jet air flows, forming an air chamber which converges at the tip by the jet air flows, supplying the atomization material under the non-atomization state into this air chamber.

Description

 Description 喷 Fog method and jet rinsing device

 The present invention provides an improved atomizing device for atomizing a fluid material typified by a metal droplet or paint melted by arc heat with jet air supplied separately, and then spraying the atomized object surface. The method, and the quinlin equipment used therefor. Background art

One of the forms of atomizing the flowable material is to blow compressed air from a nozzle, make the flowable material finer by the jetted airflow, disperse the material in the airflow, and spray the target surface. In addition, various supply modes are applied to the supply form of the jet air flow in this type of spraying apparatus according to the difference in fluid material.For example, in a general arc spraying apparatus, a wire or a spray is used. The strip-shaped metal material is melted by arc heat, and it is made finer with compressed air for atomizing and sprayed on the base material while cooling, forming a continuous fine particle film on the base material surface. Conventional techniques for supplying compressed air in this type of thermal spraying apparatus include: There are two methods: an outer envelope type that forms a main jet air curtain on the outer surface side of the arc region, and a penetration type that jets out the main jet from behind the center of the arc region toward the arc region.

 In the outer envelope type, the main jet air curtain is blown out from an annular nozzle into an R-cone shape, this R-cone-shaped air flow forms a low pressure in the conveyer, and the molten material is sent into the low-pressure area to be arc-discharged. Atomizing is performed by bringing the droplets into contact with the airflow by the attraction of the air curtain.This type of thermal spraying device is known, for example, in Japanese Patent Application Laid-Open No. 61-167472. It is. In order to reliably feed the metal droplets into the main jet air curtain, a second nozzle is provided behind the center of the arc area, and an auxiliary jet air is jetted from this nozzle toward the center of the arc area. An apparatus is known from Japanese Patent Publication No. 56-10103.

In the outer type sprayer S, the main jet air curtain of a female and female shape is formed on the outer surface of the molten material and the arc area. Therefore, compared to the impure type, the size of the thermal spraying device is easily increased, and the structure is more likely to be exempt. In particular, in the case of using a whirlpool molten material, the arc area could not be covered with the main jet air curtain unless the diameter of the annular nozzle was enlarged, and the spraying equipment S could not be made smaller and lighter. An auxiliary nozzle is provided behind the center of the arc area. In this case, the internal structure of the thermal spraying equipment becomes even more ragged, and it is necessary to connect air hoses with different supply pressures for the main and auxiliary nozzles, and there is also a drawback that the weight increases and the operability is impaired. .

 The main type has a main nozzle that blows out the main jet air behind the center of the arc area, and the linear main jet air that is blown out from the main nozzle directly acts on the metal droplet to atomize. I do. This type of apparatus is described, for example, in Japanese Patent Application Publication No. 61-181580, and in Japanese Patent Application Publication No. 60-184643, an arc is provided separately from the main nozzle. A pair of auxiliary nozzles are provided outside the region, auxiliary air is blown out from both nozzles toward the intersection of the tip of the molten material, and atomization is performed by the cooperation of the auxiliary air and the main jet air that acts directly on the gold droplet. Are described.

In the case of a poor type, atomizing is performed by directly blowing the main jet air into the arc area. For this reason, the arc portion of the molten material is cooled by the main jet air, which tends to cause an abnormally high temperature due to the Vinch effect. It melted explosively and sprayed the droplets without being refined, resulting in defects such as unevenness in the formed film. As described above, auxiliary nozzles may be used even in the penetrating type in order to ascertain such problems. The structure of thermal spraying equipment tends to be complicated.

 As described above, the conventional arc spraying apparatus has advantages and disadvantages in the structure or thermal spraying performance, both in the case of the envelope type and the poor type, and improvement thereof has been desired.

 The present invention has been proposed in view of the above, and by improving the supply form of compressed air for atomization, the structure of the thermal spraying equipment is reduced, and the size and the size of the shoe are reduced. The purpose is to realize arc spraying and to stably perform arc spraying without loss.

 Another object of the present invention is to obtain a supply form of compressed air for atomizing suitable for a medical material.

 As a second problem in the above-described arc spraying apparatus or another type of spraying apparatus S, the fact that the spray pattern is small and the distribution of fine droplets sprayed on the base material surface becomes non-uniform, Can be mentioned.

In other words, as shown in Fig. 26, the thermal spray pattern Ρ2 is almost circular, and the air volume ejected from the sozzle has a disadvantage that only a small spray area can be obtained. Then, the sprayed area can be enlarged to some extent. However, in this case, the arc spray of the material is supercooled by a large amount of jet air, and the pinch phenomenon is likely to occur, and the arc spray is stable. It becomes difficult to perform it. Also, in both the arc spraying method and the gas spraying method, a strong reversing airflow is formed on the base material surface, so that the number of droplets that bounce off without being attached to the base material increases, and the adhesion of droplets Loss is urgent.

 Usually, it is considered that a suitable separation between the thermal spraying apparatus and the base material is about 20 cm. However, by increasing the distance, the thermal spraying area can be enlarged to some extent. However, in this case, the adhesion force of the fine droplets to the base material surface is small, and the separation resistance of the sprayed coating decreases.

 Further, in the conventional apparatus, as shown in FIG. 26, the thickness of the circular sprayed pattern P2 is unnecessarily thick at the center portion and is reduced to the extent that the required thickness cannot be obtained at the peripheral portion. Therefore, there are disadvantages such as unevenness in the thickness of the thermal sprayed coating in the surface direction, which makes it impossible to form a uniform coating, and that the protection performance of the coating varies widely and lacks reliability. Furthermore, since the spray droplets are concentrated in the center, heat is likely to accumulate in the center, and the sprayed coating may be peeled off due to the difference in maturation from the periphery.

The small spray pattern area mentioned above has a great effect on work efficiency. It goes without saying that it takes a long time to form a sprayed coating of a predetermined thickness in a certain area, but it is not limited to that. Usually, the base material is blasted before spraying. The activated surface is easily oxidized, and depending on the material of the base material, the spraying operation is completed within 2 to 4 hours after blasting. Therefore, if the base material area reaches a certain value beyond the capacity of the thermal spraying device, growth cannot be performed within the above-mentioned time. Extra auxiliary work such as conversion processing is required.

 Another object of the present invention is to improve the supply form of compressed air for atomizing, thereby increasing the sprayed area several times and achieving a highly efficient film thickness distribution. The purpose is to obtain a thermal spraying device.

 As a representative example of a more familiar spraying device than a metal spraying device, a spray gun for air-based coating is generally widely used. In this method, an air cap is attached to the tip of the paint nozzle, paint and air are mixed at the paint nozzle port, and the coating liquid is atomized.If necessary, an auxiliary air nozzle port is provided. It promotes atomization of paint, adjusts coating patterns, and prevents spray paint from scattering.

In addition to the above-mentioned air atomization method, the coating spray gun sprays a high-pressure pressurized coating liquid at a low speed from a small-diameter nozzle tip, and sprays it by friction with the surrounding air. Airless people Formula types are also widely used.

 Regardless of the method, the conventional spraying equipment for coating requires a paint nozzle to make the coating liquid indispensable. * Therefore, the problem of clogging at the paint nozzle is always noticed, and every time spraying work is performed. However, it was necessary to perform troublesome disassembly and cleaning. In addition, most of the downfalls, such as malfunctions and pattern failures of the 喷 lin equipment, occurred due to paint nozzles, and their management was troublesome.

A second problem with the conventional firewood spray equipment is that it involves a large amount of invalid mist during spraying. This is because a plurality of jet air crossing each other at the paint nozzle position causes the paint to be atomized by the abrupt action, so that the straightness of the airflow after the street is weakened and its directivity is hindered. This is because When there are many invalid mist, the coating liquid is wasted and the working environment is polluted by the coating liquid and the solvent. As a countermeasure against invalid mist, an airless spray gun is provided with a ring-shaped empty nozzle around the paint nozzle, and an air curtain ejected from this nozzle envelops the paint spray area. The disclosure is disclosed in Japanese Patent Publication No. 59-206-66-6, or Japanese Utility Model Application Publication No. 57-555560. However, with this method, a part of the air force scans the spraying surface in a wet state at the same time as spraying the coating liquid. Therefore, there is a disadvantage that the spray surface is disturbed and the coating quality is deteriorated. In addition to the spray mechanism, there is a disadvantage that an air nozzle for an air curtain is separately required.

 Furthermore, in the conventional apparatus, there is a disadvantage that the spraying mechanism such as a paint nozzle or the like is required to be formed precisely, or a mutual relation between the spray nozzle and the air nozzle is made precise, so that the manufacturing cost of the spraying apparatus increases. The airless spray gun presses the coating liquid to a high pressure of 100 to 200 OteZoi, so the spray gun was expensive, and the paint supply system was expensive.

 Another object of the present invention is to eliminate the problem of nozzle clogging which has been inevitable in the spraying device, to facilitate the handling thereof and to simplify the management work.

 Another object of the present invention is to prevent the generation of invalid mist, eliminate unnecessary consumption of the coating liquid, and at the same time, eliminate the contamination of the working environment with invalid mist.

Ultimately, the ultimate object of the present invention is to provide a simple and novel atomizing mechanism that can surely and stably atomize a flowable material such as metal droplets and paints, The goal is to improve the reliability and at the same time reduce the manufacturing cost. . August

 The spraying device according to the invention of the present invention supplies the jet airflow in a supply mode basically similar to that of the outer envelope type arc spraying device, but an air chamber formed by an air curtain made of planar jet air. Is characterized by a V-shape

 Specifically, a pair of planar jet air is ejected toward the central axis with the central axis of the spray material supply means for supplying the spray material made of a fluid material in a non-spray state interposed therebetween. And

 The jet air forms a converging air chamber at the tip;

 The spraying method is characterized in that the spraying material is supplied into the air chamber in a non-spouting shape, and the spraying material is sent into jet air to perform atomizing.

 Specific examples of the spout material made of a fluid material include metal droplets, paints, blast materials, adhesives, and powders that are melted by arc heat. The development proceeded in the order of the first invention, the second invention, and the third invention.

The first invention of the present invention is directed to a first aspect of the present invention, wherein planar jet air is jetted from a pair of nozzle ports disposed with a spraying central axis interposed therebetween toward the spraying central axis, and the jet air converges at the tip by the jet air. —Forms a chamber and creates a gap between a pair of materials in the air chamber. Arc discharge was continuously generated, and droplets of the molten material generated by the arc discharge were sent into the jet air to perform atomizing.

 In the apparatus of the first invention, a pair of nozzle ports for forming planar jet air for atomizing is disposed at a position S sandwiching the spraying central axis at the front end of the case, and the ejection center lines of both nozzle ports are aligned with the spraying central axis. The two nozzle ports were pointed so as to converge toward, and the arc intersection of the pair of molten materials was positioned S in the air chamber defined by the jet air.

 In this way, jet air is ejected from a pair of nozzle ports. I: An arc curtain is formed, and only the minimum area necessary for stable arc spraying is wrapped by the air curtain. The structure can be simplified and the size of the spray device can be easily reduced.

 In addition, the arc intersection continuously performs arc discharge in a weak wind zone with a low air flow velocity flowing in the direction of the convergence of the jet air in the air chamber, and the droplets of the molten material generated by the arc discharge are formed in the weak wind zone. If atomizing is performed by sending it into the jet air with a weak wind, stable arc spraying can be performed without causing a pinch phenomenon.

In addition, even if spraying is performed by using Since a jet air curtain can be formed along the surface, arc spraying can be performed with a small nozzle, and the spraying apparatus can be downsized.

 In the second aspect of the invention, which is improved with respect to the thermal spraying pattern, in addition to the V-shaped air chamber, a pair of ji,,, I decided to cross in a direction

 In other words, a pair of nozzle ports, each forming a flat jet air, are arranged with the droplet generation position (arc intersection) of the molten material in between, and the thickness center line of both jet air is the droplet generation position S of the molten material. (Arc intersection) Inclines toward the spraying central axis at the front position, and the center lines in the width direction of both jet airs are tilted in opposite directions to the spraying central axis, and both jet airs are partially formed. The two nozzle ports are directed so that they converge and intersect.

In this way, when the thickness center line of both jet airs is inclined toward the spraying center axis, and the center in the width direction of each jet air is also inclined in the opposite direction, the droplets gather in front of the converging portion of the jet air. In this case, the two jet air do not converge, but are made finer and dispersed in an airflow consisting of crossing airflows that intersect. As a result, an oblong or elliptical thermal spray pattern as shown in FIG. 26 is obtained on the base metal surface, and the pattern area is 2.5 times that of the conventional thermal spray pattern. It can be expanded up to 3 times or more.

 In a third family in which the principle of the present invention is applied to spray mustaches of a fluid material such as paint, a spraying device supplies a spraying material to a non-culinary drawer, It is horizontal including an air nozzle that jets jet air to atomize the spray material. The air nozzle has a pair of nozzle ports for jetting out flat jets of L-shaped air.The jet air converges toward the spray center axis, and the jet direction of the nozzle ports is directed so as to form a convergent airflow after convergence. Let it. Then, the supply section of the firewood supply means is arranged in the air chamber surrounded by the jet air. Also, similarly to the second invention of the thermal spraying apparatus, the center of thickness of the pair of jet air is set to the spray center. It is preferable to converge toward the axis, and to incline the width direction center lines in opposite directions to the spray center axis.

In this spraying device g, the spray material is supplied in a non-spray state without using a nozzle by flowing the spray material or discharging the pressurized spray material from the pipeline. However, the weak wind heading for the converging portion of the jet air moves the air chamber longitudinally and is taken into the airflow. There is a large gap between the velocity of the spray and the flow rate of the jet air when it is taken into the airflow. For this reason, the spray material is shaved using As it passes through the converging section, it is subdivided and then struck by jet air in different directions to be atomized and dispersed in the airflow.

 The jet air merges at the converging section to form a single converging flow along the central axis of the spray.This converging flow consists of an orderly flow with strong directivity, and rather increases the velocity while drawing the surrounding air into the airflow. Decreases and hits target surface. In this way, by supplying the spray material in a non-fountain shape, the spray nozzle can be omitted, and the problem derived from the spray nozzle can be eliminated. Also, the spray material atomized in the converging section is speeded up to the target surface by a convergent flow with high directivity. Therefore, generation of invalid mist can be prevented, and environmental pollution due to spray material or the like can be eliminated.

As a rinin mechanism, it is possible to omit fine mist nozzles that require a high degree of high processing accuracy, and use only a simple rinlin material supply means and air nozzles to atomize the spray material and apply it to the target surface. * Therefore, the spraying device can be manufactured at a low cost, and the spray material supply means can supply the spray material from a relatively large-diameter supply port in a non-firewood state. There is no worry about clogging or wear. In addition, the jet air is pulverized by the flow action of jet air. In other words, it is possible to perform the atomization supply of the spray material without any instability factors, so that the rinsing can be performed reliably and stably. Akira's guise

 1 to 23 show the first invention of the present invention.

 Figs. 1 to 5 show an embodiment of the arc spraying fi according to the first invention, Fig. 1 is a cross-sectional plan view of the nozzle, Fig. 2 is a longitudinal sectional view of the nozzle, and Fig. 3 is an arc. FIG. 4 is a cross-sectional plan view of the arc spraying device, and FIG. 5 is a front view of the nozzle.

 6 and 7 show another embodiment of the arc spraying apparatus S according to the first invention, FIG. 6 is a cross-sectional plan view of the arc spraying apparatus, and FIG. 7 is a sectional view taken along line AA in FIG. FIG.

 8 to 23 show modified examples of the encircling nozzle of the first invention, respectively.

 Fig. 8 is a front view of the nozzle, Fig. 9 is a cross-sectional view taken along the line BB in Fig. 8, and Fig. 10 is a perspective view conceptually showing the form of jet air ejected from the nozzle of Fig. 8. FIG.

11 and 12 are front views each showing a modified example of the nozzle port, and FIG. 13 is a cross-sectional view taken along the line C-C in FIG. FIG. 14 is a front view showing another modification of the nozzle port, and FIG. 15 is a sectional view taken along line DD in FIG.

 FIGS. 16 and 17 are front views each showing another modification of the nozzle port, and FIGS. 1 & 2 are cross-sectional views showing another modification of the nozzle port.

 Fig. 19 and Fig. 20 are cross-sectional views of the nozzle with the auxiliary nozzle port added, respectively.

 FIG. 21 is a front view of the nozzle in which the opening position of the auxiliary nozzle opening is changed.

 Fig. 22 is a front view of the nozzle to which the shape-retaining nozzle is added, and Fig. 23 is a sectional view taken along line E-E in Fig. 22.

 FIGS. 24 to 37 show a second invention of the present invention.

 24 to 31 show an embodiment of the arc spraying apparatus according to the second invention, FIG. 24 is a side view showing the jet air jetting form in principle, and FIG. 25 is a plan view thereof. , FIG. 26 is a front view showing the thermal spray pattern, FIG. 27 is a vertical side view of the thermal spraying apparatus, FIG. 28 is a sectional view taken along line FF in FIG. 27, and FIG. 29 is a sectional view taken along the line GG and the line HH in FIG. 29, respectively.

FIGS. 32 to 37 show the nozzles of the device of the second invention, respectively. Show a modified example of

 FIG. 32 is a front view showing a modified example of the nozzle port.

 FIG. 33 is a front view showing another modified example of the nozzle port. FIGS. 34 and 35 show still another modified example of the nozzle. FIG. 34 is a front view and FIG. The figure is a side view.

 FIG. 36 and FIG. 37 show still another modified example of the nozzle. FIG. 36 is a front view, and FIG. 37 is a side view.

 FIGS. 38 to 48 show the third invention of the present invention.

 FIGS. 38 to 41 show an embodiment of the spraying device fi according to the third invention, FIG. 38 is a view for explaining the principle of the spraying device, FIG. 39 is a front view of an air nozzle, and FIG. The figure is a cross-sectional view taken along the line J-J in FIG. 39, and FIG. 41 is a side view of the spraying apparatus with the supply pipe changed.

 FIGS. 42 to 45 show another embodiment of the spraying device according to the third invention, FIG. 42 is a view for explaining the principle of the spraying device, FIG. 43 is a front view of an air nozzle, and FIG. FIGS. 44 and 45 are cross-sectional views taken along line K-K and line L-L in FIG. 43, respectively.

FIGS. 46 to 48 show another embodiment in which the third invention is applied to a spray gun for painting, FIG. 46 is a longitudinal side view of the spray gun, and FIG. 47 is a view of the air nozzle. FIG. 48 is a sectional view taken along line MM in FIG. 47. fl To do gfl

 1 to 5 show an arc spraying apparatus according to an embodiment of the first invention of the present invention. In FIG. 3, the arc spraying apparatus performs arc spraying using a linear material W, so that the material W passes through the rectangular box-shaped case 1 in a vertically parallel manner. A route is set, a melt feeding mechanism 2 is provided in the center of the inside of the case 1, and a nozzle 3 for jetting flat jet air 21 for atomizing is arranged on the outer surface of the front end of the case 1.

 A pair of upper and lower guide pipes 6 and 7 that define the appropriate route for the molten material W are parallel, with the isolation blocks 4 and 5 fixed in front and back of case 1 and the blocks 4 and 5 are poorly inserted in the front and back. It is arranged in. The rear guide tube 7 is directly fixed to the isolation block 5. The guide tube 6 on the front side is screwed and fixed to a pair of upper and lower electrode rods 8 mounted on the isolation block 4. As shown in FIG. 4, one end of the pole 8 protrudes from the outer surface of the case 1, and a positive electrode 9 is connected to the protruding end to supply a positive current to one electrode rod 8 and the other A negative current is applied to the pole so that an arc current is applied to the molten material W through the guide tube 6 and an arc guide tube 10 described later.

To move the welding material W closer to the arc intersection 0 on the front outer surface of the nozzle 3, each of the front guide pipes has a square j. The arc guide tube 10 that curves to the right is fixed to the gun. The arc guide tube 10 guides the upper and lower molten materials W so that they converge toward the spraying center axis P, and when turning, comes into close contact with the inner wall of the arc guide tube 10 to ensure the application of arc current. It shall be.

The molten material feeding mechanism 2 is configured to simultaneously send the upper and lower molten materials W toward the front of the case, and includes a large-diameter drive roller 12 shown in FIG. 4 and a pair of upper and lower members for pressing the molten material W against the drive roller 12. It is composed of a press roller 13 and a motor 14 for rotating the main roller 12. The driving roller 12 is formed of a solid body, and is fitted with a metal V-shaped cross-section ring 12a only at a portion circumscribing the molten material W. A knurl for friction is applied to the peripheral surface of the ring 12a. Pressing roller 1 3 It is rotatably supported by a pair of swinging arms 15 divided into upper and lower parts made of insulating material. Each of swinging arms 15 is driven by leaf spring 16 and driven roller 1 2 The pressing motor 13 presses the pressing roller 13 to press the molten material W against the peripheral surface of the ring 12a.The _fr motor 14 is housed in a lip 17 fixed to the lower surface of the case 1. The switch can be started by turning on the switch 25 provided on the rear side of the drip 17.

In Fig. 4 and Fig. 5, nozzle 3 is a thin square box A concave portion 18 is provided in the left and right center of the upper half of the upper portion to avoid the arc guide tube 10, and each of the opposing edges of the concave portion 18 is symmetrical with the spraying center axis 挟 interposed therebetween. A pair of nozzle openings 19, 19 are opened. At the lower end of the nozzle 3, a joint 20 for connecting the air hose protrudes. Compressed air is sent from this joint 20 to the air chamber 3a in the nozzle 3.

 As shown in FIG. 5, each nozzle port 19 is arranged symmetrically with respect to the spraying central axis, and a group of small holes 19a and the upper and lower portions formed to have a slightly larger diameter than these small holes 19a. And the end holes 19b are arranged so as to form a straight line in the vertical direction. The holes 19a and 19b are inclined so that the ejection center line Q1 in the thickness direction converges toward the spraying center axis P (see FIG. 1).

 The jet air ejected from the left and right nozzle openings 19 forms a V-shaped flat jet air 21 that merges at the ejection tip side, and a wedge-shaped air chamber 22 is formed in the internal area thereof. Is done. Further, inside the air chamber 22, an airflow region having a lower airflow velocity than the jet air is generated toward the converging portion of the jet,, and the air 21, and a weak wind zone 30 is formed.

The airflow spouted from the upper and lower end holes 19b is much larger than the airflow of the small holes 19a, and exhibits a stronger directivity. For this reason, the jerk near the upper and lower edges of the jaw chamber 22 is smaller than that near the center. The width of the cross section of the air 21 widens, and acts so as to inwardly cover the top and bottom of the air chamber 22. That is, key-shaped airflow walls are formed at both ends of each jet air 21, and the cross-sectional shape of the jet air 21 becomes an I-shape.

 The position relationship between the nozzle 3 and the arc intersection O of the molten material W is determined so that arc discharge occurs in the weak wind zone 30. Specifically, as shown in FIGS. 1 and 2, the arc intersection O is located on the spraying central axis P between the rear end 30 b and the front end 30 a of the weak wind zone 30, and The arc intersection O is located at a position where the arc region of the molten material W does not directly touch the jet air 21.

 When arc spraying is performed using the above air supply type, the arc portion of the material W is not directly exposed to the jet air 21, and the entire outer surface of the arc region is formed by the flat jet air 21. Arc discharge can be performed as if covered with a curtain. In other words, the outer surface of the arc region can be completely covered with the air curtain by using only the jet airflow from the pair of nozzle ports 19, as in the case of the envelope-shaped annular nozzle. Therefore, the structure and shape of the nozzle 3 can be simplified as compared with the conventional device in which a cone-shaped nozzle is indispensable, and the size and the size of the nozzle 3 can be easily reduced.

The air chamber 22 communicates with the atmosphere through upper and lower openings. Since the air is passed through, the air is drawn into the air chamber 22 by the air drawing action of the jet air 21, and the auxiliary airflow 24 as shown in FIG. 2 is generated. The auxiliary airflow 24 together with the key-shaped airflow wall formed by the slightly large-diameter end hole 19 b prevents a part of the metal droplets from scattering outside the air chamber 22. Help. In other words, metal droplets attempt to scatter in all directions due to arc quarting, and in particular, scatter up and down and backward of the arc chamber 22. and a supplemental air flow 2 4 and the end hole 1 9 b the formed hook-shaped air flow wall suppressed, it is the to di X Tsu Toea 2 1 of air flow area Komu send a metal droplet _β

 The droplets of the molten material W generated by the arc discharge mainly flow into the jet stream 21 due to the weak wind in the weak wind zone 30, and also to the auxiliary air stream 24 in cooperation. It is sent and atomized. At this time, the weak wind zone 30 and the auxiliary airflow 24 do not reach the pinch phenomenon at the time of arc discharge because of the low-speed weak wind.

This is because the inventor prototyped the above-described arc spraying apparatus, and variously changed the relative position between the air curtain formed by the jet air 21 and the arc intersection 0 as follows. Confirmed as a result of thermal spraying In group A, arc spraying was performed with the arc intersection 0 shifted back and forth between the rear end 30 b of the weak wind zone 30 and the front end of the nozzle 3,

 In group B, arc spraying was performed with the arc intersection 0 shifted back and forth between the leading end 30a and the trailing end 30b of the weak wind zone 30.

 In group C, arc spraying was performed with the arc intersection 0 shifted back and forth in the air curtain's troposphere ahead of the tip 30a of the weak wind zone 30.

 As a result, in the group A, a part of the scattered droplets scattered and fell without being taken into the jet air 21, and especially, the closer the arc intersection 0 was to the nozzle 3, the more scattered droplet loss occurred.

 In group C, the explosive melting of the molten material W due to the vinch phenomenon, which is peculiar to the conventional poor type, caused unevenness in the formed coating.

 In group B, there was no loss of droplets seen in group A and no explosive melting of molten material W seen in group C, and stable arc discharge was possible, and the finished state of the formed film was uneven. In view of the fact that the particle size was sufficiently small, it was confirmed that suitable atomizing was performed.

 From the above test results, in the present invention, it was decided that the arc intersection 0 was located in the weak wind zone 30.

In addition, if the convergence angle of the jet air is reduced during the test bed, the droplets can be more efficiently fed into the jet air. Was confirmed.

 FIG. 6 and FIG. 7 show an embodiment in which the first invention is applied to an arc spraying apparatus using a whirl-like molten material W.

 In FIG. 6, the arc spraying device fi of this embodiment has almost the same structure as the arc spraying device described in the previous embodiment, except that a pair of welding materials W There is a difference in that each molten material W is separately fed and driven by a dedicated molten material feeder connection 2, 2. Further, in the above embodiment, the ejection center line Q1 in the thickness direction of the nozzle port 19 and the convergence center line of the molten material W are positioned on a plane that intersects. However, in this embodiment, the ejection center line Q It was assumed that 1 and the convergence center line of the molten material W were almost parallel. The opening structure of the nozzle port 19 is set to be the same as that of the above embodiment, but the vertical length thereof is set to be sufficiently larger than the width of the molten material W. Note that the same reference numerals are given to members equivalent to those of the above embodiment. Therefore, the description is omitted.

FIG. 8 and FIG. 20 show modified examples of the nozzle 3, in which the cross-sectional shape of the flat jet air 21 is more clearly defined as a U-shape. The nozzle 21 has a straight (rectangular) cross section, the nozzle 19 has an auxiliary nozzle port 31 in addition to the nozzle port 19, and the nozzle retainer 3 reinforces the jet air 21. 2 is provided. In the drawings, the same members as those in the previous embodiment are denoted by the same reference numerals, and description thereof will be omitted.

 In FIG. 8, each nozzle opening 19 has a group of small holes 19a forming a straight line in the vertical direction, and a group of small holes 1a extending laterally inward at both upper and lower ends of the straight line. 9c, the angle of inclination of the ejection center line Q1 of both small holes 1 9a and 1c is set to be the same.

 According to the nozzle port 19 thus configured, as shown in FIGS. 9 and 10, the upper and lower openings の of the air chamber 22 are provided with the airflow 21 1 ejected from the small holes 19 c at the upper and lower ends. The cross-section of each jet air 21 covered by a can be made into a clear U-shape, and the vertical dispersion of the metal droplets can be completely prevented.

 FIG. 11 shows that the cross section of the jet air 21 is formed into a U-shape by forming the nozzle opening 19 as a U-shaped slit.

Figures JL 2 and 13 show that the nozzle port 19 is formed by only a group of small holes 19a that form a vertical straight line, and the hole shape of the upper and lower end holes 19d Is formed in a tapered shape so that jet air 21 having a U-shaped cross section can be formed. In the nozzle 3 shown in FIG. 14, contrary to the nozzle opening 19 described in FIG. 8, the small holes 19 e at the upper and lower ends are arranged so as to form a row outward in the horizontal direction. As shown in Fig. 15, the jet center line q of the small hole 19e is inclined inwardly from the center line Q1 of the small hole 19a to form the jet air 21 with a U-shaped cross section. I made it possible.

 The nozzle 3 of the thermal spraying apparatus shown in FIGS. 1 to 15 described above actively forms key-shaped airflow walls at both ends of the linear portion of the jet air 21 formed by the nozzle 3 to scatter the metal droplets in the vertical direction. However, it is not necessary to provide a nozzle opening that actively forms such a key-shaped airflow wall.

 That is, the nozzle opening 19 of the nozzle 3 in FIG. 16 is a series of small holes of the same diameter linearly connected, and the nozzle 19 of the nozzle 3 in FIG. 17 is a slit that is linearly continuous. Yes, in nozzle 3 in Fig. 18, a ceramic nozzle member 26 is attached to the nozzle body, and the nozzle member 26 is provided with the nozzle port 19 in Fig. 16 or Fig. 17. .

The flat jet air 21 formed by the nozzle port 19 in FIGS. 16 to 18 has a slight swelling at both ends thereof, but actively forms the key-shaped airflow wall. Since it is not formed, the length of the nozzle port 19 is increased by the jet air car Both ends of the ten 21 must be long enough to prevent the metal droplets from scattering in the vertical direction during arc discharge.

 The nozzle 3 shown in FIG. 19 is provided with one auxiliary nozzle port 31 at the same height as the spraying center axis P of the opposite wall of the concave portion 18. The direction is directed to the opposing concave side wall 18a. In this case, the air flow ejected from the auxiliary nozzle port 31 strikes the concave side wall 18a and moves to the arc chamber 22 side. The above-mentioned auxiliary nozzle port 31 for preventing the droplets from scattering toward the surface can be formed as a diverging hole as shown in FIG. Specifically, the hole shape is determined so that the jet stream converges on the nozzle 3 side from the arc intersection 0, and the rear auxiliary stream 33 prevents droplets from scattering behind.

 In addition, regarding the provision of the auxiliary nozzle port 31 in FIG. 19 and FIG. 20, the structure of the nozzle port 19 may be any of those described above.

 As shown in FIG. 21, when the nozzle port 19 is formed in a U-shape, the auxiliary nozzle port 31 can be formed adjacent to the nozzle port 19.

The nozzle 3 shown in FIG. 22 has a shape-retaining nozzle port 32 provided outside the nozzle port 19 in parallel with the nozzle port 19. Shape Shape Nose The roulette 32 is composed of a group of small holes 32a forming a straight line in the vertical direction, and the ejection center line S is the same as the ejection center line Q1 of the nozzle port 19 as shown in Fig. 23. The nozzle 3 is tilted so as to expand slightly outward. With this nozzle 3, the jet air 21 can be restricted from expanding outward, and the spray pattern can be flattened. Note that the shape-retaining nozzle port 32 can also be modified into a U shape or a C shape.

 As described above, the shape of the nozzle port 19 is usually a group of small holes forming a straight line, a slit, a group of small holes having a U-shape, and a slit, but this is not limited to the spirit of the present invention. The shape of the nozzle opening 19 is not limited, and can be deformed into a simple I shape, a C shape, a crescent shape, or the like, or a bent shape such as a U-shape. .

 In the above description, the pair of nozzle ports 19 are arranged so as to be symmetrical with respect to a vertical line passing through the spraying central axis 溶, but this is not necessarily required, as long as it does not contradict the spirit of the present invention. It can be provided anywhere around the spraying central axis Ρ.

According to the spray device configured as described above, the outer surface of the arc region is covered only by the jet air curtain 21 ejected from the pair of nozzle ports 19 provided with the spraying central axis 挟 interposed therebetween. As a result, the nozzle structure is simpler than that of a conventional envelope-type thermal spraying device. It can be purified and downsized.

 In particular, a pair of nozzle ports 19 forms an air chamber 22 consisting of jet air 21 and melts in a weak wind zone 30 surrounded by the jet air force 22 and having a low airflow velocity. If the material W is arced and droplets of the material W generated by the arc discharge are sent to the jet air curtain 21 by a weak wind in the troposphere 30 to perform atomization, a pinch phenomenon occurs. Arc spraying can be performed stably without any trouble.

 Furthermore, even when the thermal spraying is performed using the whirlpool-shaped molten material W, the air curtain 21 can be formed along the outer surface, so that the small nozzle 3 can perform the arc thermal spraying, and the thermal spraying can be performed. This is advantageous in that the device can be downsized.

 FIGS. 24 to 37 show an arc spraying apparatus according to the second invention of the present invention, which is a further improvement of the first invention.

FIGS. 24 to 31 show an embodiment of the arc-sprayed beard of the second invention. In FIG. 27, the arc spraying apparatus performs arc spraying using a round wire-shaped material W, and the material W passes in a rectangular box-shaped case 51 in a vertically parallel posture. The case 51 is provided with a molten material feeding mechanism 52 at the center of the inside of the case 51, and a nozzle 53 for jetting jet air for atomizing is arranged on the outer surface of the front end of the case 51. In FIG. 28, a case 51 is made of a metal case body 54 having one side opening, insulating blocks 55 and 56 fixed to front and rear ends of the case body 54, and hinged to the opening. It consists of a nut 58 that opens and closes automatically via a pin 57, and a bracket 59 for a nozzle 53 that covers the front of the front insulating block 55. The latch 60 can be easily opened by sliding the latch 60 against the spring 1. The bracket 59 can be removed from the isolation block 55 by loosening the screw 62, which is convenient for replacing the nozzle 53.

 A pair of upper and lower guide tubes 64 are fixed to the rear insulation block 56 to guide the molten material W, and are sent to the front insulation block 55 corresponding to these guide tubes 64. Pass holes 65 through. Further, a terminal 66 is provided continuously to each of the feed holes 65, and an arc guide tube 67 is screwed and fixed to the front surface of the terminal 66. A lined electric wire is connected to each of the terminals 66, and a positive current is applied to one of them and a negative current is applied to the other.

As shown in Fig. 27, the upper and lower arc guide tubes 67 are arranged in an inclined position so that their protruding ends approach vertically, and the upper and lower molten material nozzles 53 have an arc on the front outer surface. Guide the deflection toward the intersection O During this deflection, the molten material W Pressing against the inner wall of 7 to ensure arc current application o

 The molten material feed mechanism 52 is arranged between the front insulating block 55 and the guide tube 64, and works to temporarily send the upper and lower molten materials W toward the front of the case. In FIGS. 27 and 28, the material feed mechanism 52 is composed of a drive roller 68 supported rotatably by the upper and lower walls of the main case 54, and a drive roller 68 for transferring the material W. A pressing roller 69 for pressing and a driving roller 8 are constituted by a motor 71 for rotating and driving via a pair of gears 70 and the like.

The shaft roller 6 S is formed by fixing an insulating roller 7 3 to a roller shaft 72. A metal ring 7 4 having a V-shaped cross section is fixed to the upper and lower portions of the insulating roller 7 3. The metal ring 74 is knurled to prevent _β- slip, which causes the molten material W to be sandwiched between 4 and the holding roller 69 and is forcibly fed.

The pressing roller 6 is also formed of a frame like the driving roller 68, and is arranged vertically corresponding to each insulating roller 73. The presser roller 69 is rotatably supported at one end of the spring arm 75, and is pressed against the drive roller 68 by the elastic force of the spring arm 75. The base end of the spring arm 75 is fixed to the inner surface of 蓥 58. As shown in FIG. 27, the motor 71 is mounted on the lower surface of the case 51. It is housed in a fixed lip 76, which is activated when a switch (not shown) is turned on, and transmits its rotational power to a drive roller 68 via a gear 70.

 The nozzle 53 is formed in the shape of a hollow box that is long in the vertical direction.A recess 78 is provided in the center of the upper half on the left and right sides to avoid the arc guide tube 67, and each of the left and right front end walls divided by the recess 78. The nozzle opening 79 is opened. 80 is a joint for connecting the air hose.

 The nozzle port 79 is refined by a group of small holes 79a forming upper and lower linear rows, and the jet air merges after jetting to form planar jet air 81, 81. The ejection direction of the jet air 81 is directed so that its thickness center line Q1 is inclined toward the spraying center axis P in front of the arc intersection point 0 (droplet generation position) of the material W, and As shown in FIGS. 30 and 31, the center lines Q 2 and Q 2 in the width direction of the jet airs 81 and 81 are inclined in opposite directions to the spraying center axis P, and The jet air 81, 81 is directed so as to converge and intersect a part thereof (Fig. 24) Here, the angle 1 sandwiched by the thickness center line Q1 does not matter, It is preferable to set the angle in the range of 12 to 24 degrees, and the inclination angle of the center line Q2 in the width direction.

2 has a convergent part R and if it intersects, the angle is It does not matter, but it is preferable to set the angle in the range of 5 to 40 degrees.

 In order to reduce the numerical aperture of the small hole 79a and reduce air consumption 上下, the vertical position of the left and right nozzle ports 79 is vertically aligned in the direction of inclination of the radial center line Q2. * For details, as shown in Fig. 29, the nozzle port 79 on the left side of the figure is slightly deliquescent upward from the spraying center axis P, and the nozzle hole 7 on the right side Conversely, 9 is being drawn down.

 The jet air 81, 81 jetted from the left and right nozzle openings 79, 79 forms a V-shaped air curtain in plan view, and defines an air chamber therein. The arc intersection point 0 of the molten material W that makes the molten material W droplets is set on the spraying center axis P in the weak wind zone flowing in the direction of the converging portion of the jet air 81, 81. This is a collective airflow formed ahead of the converging section R of the air 81.

When arc spraying is performed using the nozzle 53 configured as described above, the droplets of the molten material W become finer in the gasosphere consisting of the crossed airflow 86 that intersects without converging with the gathered airflow 82. However, as shown in FIG. 26, an elliptical thermal spray pattern P1 was obtained. The minor axis length of the thermal spray pattern P1 is almost the same as the diameter D of the thermal spray pattern P2 by the device of the first invention, and the major axis length L is Approximately three times D. This means that the droplets at the same position were dispersed over a wider range, and it was confirmed that even in the actual spray pattern P1, the thickness was uniform in the plane direction. The long axis of the thermal spray pattern P1 is inclined at an angle with respect to the vertical center axis of the thermal spraying equipment S. This is because the center line Q2 in the width direction of the jet air -81 has an inclination. This is probably because the airflow after the intersection is twisted in one direction.

 FIGS. 32 and 33 show modified examples in which the arrangement pattern of the small holes 79a is changed. In the nozzle shown in Fig. 32, the left and right nozzle ports 79, 79 are arranged symmetrically so that the vertical positions of the left and right nozzle ports 79, 79 coincide. In addition, in the nozzle shown in FIG. 33, in addition to the nozzle ports 79 and 79 described in the above embodiment, an auxiliary nozzle port 34 is provided outside thereof.

In addition to the above, the nozzle port 79 may be formed in a series of slits as shown in FIGS. 34 and 36. At this time, the air tank 85 in the nozzle 53 must be provided at an angle, and in this case, the jet gates 81, 81 formed by the two nozzle ports 79, 79 are provided with the above-described embodiment. It is possible to have the directivity of the same air as the jet air. With this slit-shaped nozzle port 79, it is possible to supply a large amount of nozzle air, and it can be applied to a very large sprayer. As shown in Fig. 34, Fig. 34 Fig. 35 shows a combination of a pair of nozzles 53 and 53.In the modified example of Figs. 36 and 37, a single nozzle 53 is provided with a pair of nozzle ports 79 and 79. The inclination angle of the center line Q2 in the width direction of the jet air 8 1 may be different between the left and right sides.

 The molten material W may be in a whirlpool shape. In this case, jet air 81 is jetted along the longitudinal direction of the molten material W.

 In the thermal spraying apparatus configured as described above, a flat jet air 81, 81 is ejected from a pair of nozzle ports 79, 79, and an air flow surrounded by both jets, 81, 81 is formed. The molten material is melted in the chamber, and at this time, the nozzle romas 9 and 79 are directed obliquely so that the widthwise center lines Q2 of the jet air 81 and 81 are inclined in opposite directions. During Ising, the droplets were dispersed in the jet air stream, resulting in a long and oval wide thermal spray pattern No. 1, and the pattern area could be increased several times compared to the conventional pattern. .

Therefore, the above. Thermal spray! According to!, The sprayed coating can be efficiently formed in a short time, and the productivity of the film forming operation can be remarkably improved. In particular, even when the base material area is large, the thermal spray coating can be formed at a stretch before the surface appearance deteriorates.Also, since the thickness of the thermal spray coating in the surface direction is uniform, the coating quality is high. The protection performance can be improved and reliability can be improved. Since a thick film portion is not formed, separation of the film due to local heat concentration can be eliminated.

 FIGS. 38 to 48 show a third invention of the present invention in which the first invention and the second invention are applied to an apparatus for spraying a spray material such as paint, blast material, adhesive, or powder. Note that, in a broad sense, the thermal spraying devices of the first and second inventions are also included in the spraying device because metal droplets are sprayed on the base material in the form of a firewood.

 FIGS. 38 to 41 show an embodiment of the spraying device a of the third invention.

 The spray device S includes a spray material supply means 102 for supplying a spray material 101 such as a paint, a blast material, an adhesive, or a powder, and a spray material supply device 102 for atomizing the spray material 101. The spray mechanism is configured with the air nozzle 103 as an element member.

The spray material supply means 102 has a tank or a cup-shaped container 104 for storing the spray material 101, and a supply pipe 105 derived from the container 104, and is provided with air. at a pressure of compressed air Oku耠through passages 1 0 6, although not ₉ illustrates releasing spray material 1 0 1 container 1 0 4 from subjected耠管1 0 5, provided耠管1 0 5 is provided with an on-off valve for interrupting the supply of the spray material 101 and a flow control valve for adjusting the discharge position. 1 1 5 is the surface to be sprayed Three

,

 In FIG. 39, the air nozzle 103 is formed in a vertically long hollow box shape, and has a pair of left and right nozzle ports 107 opened at the front end wall. The air nozzle 103 is provided so as to penetrate substantially the center of the air nozzle 103 back and forth, and is arranged so that both nozzle ports 107 are located symmetrically with the supply pipe 105 easily interposed therebetween. Numeral 108 is a joint for connecting the air hose.

Each nozzle port 107 is composed of a group of small holes 109 forming an upper and lower linear row, and ejects planar jet air 110 as shown in FIG. The jet direction of the jet air is directed so that the thickness center line Q 1 of the jet air 110 converges from the outlet (supply part) 111 of the ft 耠 pipe 105 toward the center axis P of the spray. I have. As a result, a V-shaped air curtain is formed by the two jet airs 110, and a wedge-shaped chamber 112 is defined therein. J / "1 1 0 merges before and after the thick core Q 1 to form one convergent air flow 1 13, which gradually cross-sectional area along the spray center axis P The supply pipe 1.05 outlet 1 1 1 is located on the spray center axis P in the weak wind area in the air chamber 1 1 2 Have been. In the spray mechanism configured as described above, the spray material 101 is supplied in a non-spray state. Specifically, the firewood material 101 is simply discharged into the chamber 112 from the outlet 111 of the supply pipe 105. A weak wind is formed in the chamber 1 12 toward the converging section 1 14 .Therefore, the spray material 101 is gradually accelerated by the weak wind and moves toward the converging section 1 14. And easily separated into small chunks of this movement, and finally taken into the jet air 110 from inside.

By the way, there is a large difference between the moving speed of the spray material 101 and the flow velocity of the jet air 110. Therefore, the spray material 101 is taken into the airflow by being scraped by the jet air 110, and is subdivided. After that, the subdivided spray material 101 is formed by the two jet airs 110. Pass through the converging section 1 1 4 where the streets are striking. In the converging section 114, the spray material 101 is hit by the jet air 110, and simultaneously pushed back in the direction of the hit, and is again struck by the jet air 110, which is different in direction, to be refined. In this way, the atomized material 101 that has been sufficiently atomized while passing through the turbulent flow area of the converging portion 114 is evenly dispersed in the airflow, and is sprayed by the convergent airflow 113. 1 1 5 are conveyed to * convergent stream 1 1 3 has strong directivity, _fr is Machi突to spray the target surface with narrowing wind-ambient air therefore atomized spray material 1 0 1 convergence airflow 1 Drop from 1 3 As shown in FIG. 38, the pattern No. 3 obtained by spraying has a substantially circular shape.

 The outlet 111 of the supply pipe 105 can be changed as shown in FIG. In this configuration, the outlet 111 is formed in a vertically long slit shape so that the spray material 101 can be distributed and supplied in the vertical direction of the jet air 110. The spray pattern # 3 in this case also has the same shape as in FIG.

 Further, the outlet 111 of the supply pipe 105 can be changed so as to open at the front wall of the air nozzle 103.

 Further, the spray material 101 can be supplied by utilizing the action of gravity, and it is not always necessary to supply it under pressure. Also, there is no need to supply using the supply pipe 105

FIGS. 42 to 45 show another embodiment of the third invention, in which the spray pattern 4 can be formed in an elliptical or elliptical flat shape. -In this case, similarly to the above embodiment, the exit direction of the nozzle port 107 is directed such that the thickness center Q1 of the nozzle air 110 converges toward the spray center axis Ρ. Further, as shown in FIG. 42, the center lines Q2 in the width direction of the two jet airs 110 are inclined in opposite directions to the spray center axis 同 様, as in the second invention. Orientation. As a result, both jet airs 110 cross each other in a V-shape in the width direction and converge, forming an airflow region 113a that does not converge above and below the convergent airflow 113.

 The left and right small hole groups 109 a and 109 b are shown in FIGS. 43 to 45 in order to reduce the air gap when the center line Q 2 in the width direction is inclined. As shown in the figure, the holes are shifted S up and down, in detail. Conversely, the group 109b is lent downward.

When spraying is performed by the spraying apparatus described above, an oblong spray pattern P4 as shown in FIG. 42 is obtained. The short-axis length of the spray pattern P4 is substantially the same as that of the spray pattern P3 according to the above-described embodiment of the third invention, and the long-axis length is about three times the diameter. This means that the same amount of spray 101 is distributed over a wider range. The long axis of the spray pattern P 4 is inclined by an angle << with respect to the vertical center axis H of the spraying device. This is because the center line Q 2 in the width direction of the jet air 110 has a slope and the air flow after the intersection The air nozzle 103 is changed to the nozzle 53 described in FIGS. 34 to 37, and the nozzle port 107 is moved up and down. It can be formed as a long slit. in this way, -

If the nozzle port 107 has a slit structure, the number of sprayed air per unit time can be increased since the air to be jetted is increased.

 FIGS. 46 to 48 show an embodiment in which the third invention is applied to a spray gun for painting.

 In FIG. 48, the spray gun opens and operates the body 13, the air valve 13 1 and the paint valve 13 2 incorporated therein, and these valves 13 1 and 13 2 It is composed of a trigger 133, an air nozzle 103 mounted on the front end of the body 130, a supply pipe 105, and the like.

 The air valve 13 1 urges the valve case 13 4, the plug 13 6 that opens and closes the valve port 13 5 provided in the case 13 4, and the plug 13 6 in the closed state. It is formed by a valve spring 1337 and the like, and is disposed above the grip 140. When the trigger 1 33 is squeezed, the rest 1 36 moves backward against the valve spring 13 7 to form a gap between the plug 13 6 and the valve case 13 4. Compressed air enters from this gap and flows into the air nozzle 103 through the valve port 135 and the air passage 138. The air nozzle 103 and the air passage 13 & communicate with each other via a joint 13.

149 is a compressed air inlet passage.

The paint valve 1 3 2 is provided in front of the trigger 1 3 3, The valve seat 1 4 3 attached to the front end of the valve 茧 i 4 2, the valve stem 1 4 4 that opens and closes by contacting and separating from the valve seat 1 4 3, and the entire valve stem 1 4 4 as the valve seat 1 4 3 It is composed of a valve spring 1 4 5 etc. which is biased toward the surface. The valve stem 144 consists of a valve body 144, a rod 144 extending vertically through the plug 131, and an interlocking piece 144 accepting one end of the valve spring 144. Triggered via body 13 36 and triggered by opening 13 3. Specifically, the valve body 144 is configured to be separated from the valve seat 144 after the plug rest 136 is opened and the compressed air is ejected from the air nozzle 103. To obtain this movement, a small gap is provided between the plug 13 and the interlocking piece 1 48. Reference numeral 150 denotes an inlet passage for paint. The paint is stored in a separate tank, and the inlet passage is formed by the action of gravity or the pressure of compressed air acting in the tank. Sent to 0.

The air nozzle 103 fights against a pair of jet air 110 ejected from the nozzle opening 107 consisting of a group of small holes, and its thickness center line Q1 and width center line Q2 The air nozzle 103 is directed to be inclined in the same manner as the air nozzle 103 of the embodiment, and is different in that compressed air is introduced from the upper rear surface of the air nozzle 103. The supplied pipe 105 is screwed and fixed to the valve seat 144 with the air nozzle 103 in front and rear of the air nozzle 103, so that the outlet 1 1 If a plurality of supply pipes 105 having different diameters are prepared, the supply pipes 105 can be easily exchanged, for example, according to the difference in the viscosity of the paint.

 In addition to the nozzle opening 107 opening in a straight line で き る, the nozzle opening 107 can also open so as to be curved in a gentle arc shape. When a pair of nozzle openings 107 is provided, the nozzle openings 107 may be arranged vertically in parallel. Furthermore, it can be changed so that jet air 110 is jetted from three or more nozzle ports 107.

 As described above, in this firewood apparatus, the air nozzle 103 blows out the planar jet air 110, converges the jet air 110 toward the spray center axis P, and forms a chamber at a part thereof. 1 1 2 is partitioned, and the spray material 101 is supplied in a non-spray state into the chamber 1 12 to perform atomization. Further, the converged jet air 110 forms a converged airflow 113 and conveys the atomized spray material 101 to the spray target surface 105.

Therefore, according to this spraying device, the spraying material 101 can be atomized without using a nozzle for jet rinsing, so that the problem of clogging in the nozzle which was inevitable in the conventional device can be reduced. As a result, various problems arising from clogging can be eliminated, the handling thereof can be facilitated, and at the same time, the management work can be simplified, and there is no fear of clogging. Glue, there is Even powders can be reliably atomized.

 Further, even if a blast material for shot blasting is used as the spray material 101, the blast material is supplied in a non-sprayed state, so that abrasion of the supply portion 111 can be prevented.

 At the converging section 1 14 of the converging jet air 110, the final atomization is performed and the atomization is performed, and the atomized spray material 101 is formed into a convergent airflow that forms an orderly flow 1 113 Target surface

Since it is connected to 115, it is possible to prevent generation of invalid mist, for example, to prevent contamination of the working environment by spray material 101 and solvents, etc., and waste of firewood material 101 This is advantageous because it can prevent unnecessary consumption. In addition, compared to the conventional device g, which atomizes using a highly-accurate rinin nozzle or air cap, the rinin mechanism can be extremely simplified, and the rinsing device S can be manufactured at low cost. Can be manufactured.

 In addition, there is no fear of clogging or wear in the means of supplying ginlin material, and the atomization principle is simple, so that atomization can be performed with no instability factors. For example, even when the atomizing material 101 adheres to the supply unit 111, atomization can be performed reliably and stably, and the operational reliability of the spraying device is improved. Can be improved.

Industrial applicability As can be understood from the above description, the spraying device according to the present invention is useful as a metal spraying device S typified by an arc spraying device, as a spraying device for coating, and an adhesive other than paint. It sprays fluid materials such as powder, powder or blast material, and uses a spraying device based on atomization with compressed air.

Claims

The scope of the claims

 1. Spray material that supplies spray material made of a fluid material in a non-sprayed state. A pair of planar jets: L-jet air is ejected toward the center axis with the center axis of the supply means interposed therebetween. ,

 The above-mentioned di: the air chamber forms a converging air chamber at the tip,

 A spraying method characterized by supplying the sprayed material in a non-sprayed state into the air chamber, sending the sprayed material into the jet air and performing atomization.

 2. The spray method according to claim 1, wherein the thickness center lines of the pair of jet air are converged toward the spray center axis, and the width center lines are inclined in opposite directions to the center axis.

 3. A spray material supply means for supplying the spray material made of a fluid material in a non-spray form, and an air nozzle for ejecting jet air to atomize the spray material.

 The air nozzle has a pair of nozzles for jetting planar jet air, and the jet air converges toward the spray center axis and directs the jet direction of the nozzle port so that a converged airflow is formed after convergence. ,

An injection mannequin, characterized in that a supply part of spraying material supply means is arranged in a chamber surrounded by a jet.

4. Concentrate the thickness center lines of the pair of jet air toward the spray center axis, and direct the jet direction of the nozzle port so that the width center lines are inclined in opposite directions to the spray center axis. The spray device according to claim 3.

 5. A plane jet of air is ejected from a pair of nozzle ports arranged with the spraying center axis P interposed therebetween toward the spraying center axis, and the jet air forms an air chamber that converges at the tip. ,

 Arc discharge is continuously generated between a pair of molten materials in the air chamber,

 Arc spraying method wherein atomization is performed by sending droplets of a molten material generated by arc discharge into jet air and performing atomization.

6. A pair of nozzle ports that form planar jet air for atomizing are arranged with the spraying center axis at the front end of the case sandwiched between them, so that the ejection centers of both nozzle ports converge toward the spraying center axis. Point the nozzle opening,

An arc spraying apparatus characterized in that an arc intersection of a pair of molten materials _w is located in an air chamber defined by jet air.

7. The arc spraying device S according to claim 6, wherein each nozzle port is formed in a straight line.

8. The arc spraying device according to claim 6, wherein each nozzle opening is formed in a U-shape in a front view.

 9. The arc spraying apparatus according to claim 7, wherein an auxiliary nozzle port for forming an airflow from the nozzle side toward the arc intersection side is provided in the air chamber.

 10. The arc spraying device according to claim 7, wherein the nozzle has a shape-retaining nozzle opening for forming a substantially parallel air flow along the outer surface of the jet air.

 1 1. A pair of flat jet air is sandwiched between the positions where the droplets of the molten material are generated, and the thickness center lines of both jet air are inclined toward the spraying central axis located forward of the positions where the droplets of the molten material are generated. In addition, the center lines in the width direction of the jet airs are inclined in opposite directions to the spraying center axis, and the jet airs are jetted so as to converge and converge a part thereof.

 An air chamber is formed at the converging portion of the jet air, and an arc discharge is continuously generated between the pair of molten materials by the air chamber,

 An arc spraying method, characterized in that droplets of a molten material generated by arc discharge are sent into jet air to perform atomizing.

1 2. A pair of nozzle ports, each forming a flat jet air, are interposed between the positions where the droplets of the molten material are generated. δ

The thickness center lines of both jet airs are inclined toward the spraying center axis located in front of the droplet generation position ffi of the molten material, and the center lines in the width direction of both jetters are opposite to each other with respect to the spraying center axis. An arc spraying apparatus characterized in that both nozzle openings are directed such that both jet airs converge and intersect with a part of the nozzles.

 13. An arc spraying apparatus according to claim 12, wherein each nozzle port comprises a group of small holes formed in a straight line.

 14. The arc spraying apparatus according to claim 13, wherein the nozzle has a shape-retaining nozzle opening that forms a substantially parallel air flow along the outer surface of the jet air.

 15. The arc spraying apparatus according to claim 12, wherein each nozzle port comprises a group of small holes formed in a straight line.

 16. The arc spraying apparatus according to claim 15, wherein the nozzle has a shape-retaining nozzle opening for forming a substantially parallel air flow along the outer surface of the jet air.