JPH11128786A - Coating device for high viscosity material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the application of a high viscosity material using a mechanical device without depending upon a manual operation and saving on a material with the least splash of the material to surroundings at the time of coating and with no physical hazards to an operator. SOLUTION: This coating device for a high viscosity material is equipped with a high viscosity material supply pump 2, a blower 3 for supplying a low pressure air and a gun 5 which blows off the high viscosity material to be supplied from the pump 2 and the low pressure air to be supplied from the blower 3 together. The gun 5 has a high viscosity material blow-off opening formed on the inside of the tip of the gun 5 and a low pressure air blow-off opening formed on the outer peripheral side of the high viscosity material blow- off opening. In addition, the cross section of the internal low pressure air passageway of the gun 5 is of such a shape that the cross section is narrower at the tip part of the gun 5 and is broader and almost uniform at the part other than the tip part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for applying a high-viscosity material such as urethane or epoxy, and is applicable to the application of floor coating, waterproof coating, and the like.

[0002]

2. Description of the Related Art Some floor coatings for buildings, waterproof coatings, and various sports courts such as tennis and basketball have been applied by applying a high-viscosity material such as urethane or epoxy. Conventionally, the operation of applying a generally high-viscosity material is performed manually. However, the manual operation of applying a high-viscosity material is a severe operation to bend down and poses a health problem, such as a worker easily suffering from low back pain. In addition, there is a demand for mechanization in terms of labor saving.

[0003] Therefore, it is conceivable to apply a high-viscosity material using a sprayer, but it has not been realized due to difficult problems to be solved technically. Since a high-viscosity material is generally a mixture of a plurality of materials, for example, a mixture of a base material and a curing agent, when applying a high-viscosity material using a conventional sprayer, the viscosity before mixing the plurality of materials is high. It is conceivable to use a sprayer for each material having a relatively low spray, spray simultaneously toward the application target, and mix a plurality of materials outside the sprayer. However, in this case, mixing of a plurality of materials is uncertain, and it is also difficult to confirm whether or not the plurality of materials are sufficiently mixed.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and realizes application of a high-viscosity material using a mechanical device without manual operation. It is an object of the present invention to provide a coated coating device.
The present invention also enables the application of a plurality of materials in a uniformly mixed state while ensuring that the materials are not scattered around the materials at the time of application, and the health of workers is not impaired. It is an object of the present invention to provide a coating device for a high-viscosity material that can eliminate the need for a high-viscosity material.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a high-viscosity material supply pump, a low-pressure air supply blower, and a high-viscosity material supply pump supplied from the high-viscosity material supply pump. A gun for blowing out the material and the low-pressure air supplied from the blower together, wherein the gun has a high-viscosity material outlet on the inside of its tip and a low-pressure air outlet on the outer peripheral side of the high-viscosity material outlet. The low-pressure air passage in the gun has a narrow cross-sectional area at the tip of the gun, and has a wide and substantially uniform cross-sectional area in other areas. The high-viscosity material may be a mixture of a plurality of materials in advance.

The above-described coating apparatus for a high-viscosity material according to the present invention realizes coating of a high-viscosity material using a mechanical device by improving a device similar to a low-pressure coating machine. Conventionally used coating equipment generally uses high-pressure, high-velocity air to atomize paint,
The paint particles are directed to the paint object by themselves, thereby painting the paint object. According to such a coating device, the paint blown out from the gun is atomized and scatters around, and also bounces off the coating surface and scatters around,
The atomized paint may enter the worker's respiratory tract and harm the worker's health, increase the waste of paint, or apply the paint only to the specified application target, and apply the paint to other objects. There is a drawback in that the masking work as a preparation in order to prevent such a situation from being performed becomes large.

On the other hand, the above-mentioned low-pressure coating machine can be said to be a so-called coating apparatus based on air flow, for example, in which the air pressure used is about 1/20 of that of high-pressure coating and the air flow is about 20 times. At the tip of the gun used in this low-pressure coating machine,
There is a paint outlet on the inside and a low-pressure air outlet on the outer periphery, and the paint blown out from the paint outlet is
It is formed into particles by the flow of a large amount of air outside and is carried to the painted surface together with the air and adheres to the painted surface. Therefore, if a low-pressure coating machine is used, the paint blown out from the paint outlet is less scattered to the periphery because the outside is surrounded by low-pressure air, so that the factors that impair the health of workers are drastically reduced, and Has many advantages, such as reduced waste and no need for extensive masking.

The present invention utilizes the technology of a low-pressure coating machine having many advantages as described above, and realizes a mechanization of a coating operation of a high-viscosity material by improving the technology. .

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a high-viscosity material coating apparatus according to an embodiment of the present invention. First, a configuration example of the entire apparatus shown in FIG. 1 will be described. The high-viscosity material application device shown in FIG. 1 is roughly divided into a high-viscosity material supply pump 2, a blower 3 for supplying low-pressure air, and a gun 5. The high-viscosity material supply pump 2 is connected to the high-viscosity material tank 1 together with the carrier 20.
The carrier 20 moves to an arbitrary location together with the material tank 1 by the carrier 20, and can take a predetermined stationary posture together with the carrier 20 at an arbitrary location. The material tank 1 contains a high-viscosity material in which a plurality of materials are sufficiently stirred in advance. Material tank 1
The high-viscosity material inside is sucked up by the pump 2 through a hose 9. The blower 3 is relatively light and can be carried by an operator. The pump 2 and the blower 3 are driven by a motor and receive power from an outlet 6 through a plug 7 and a plug 8, respectively.

The pump 2 and the gun 5 are connected by a hose 10, and a high-viscosity material is supplied from the pump 2 to the gun 5 via the hose 10. Blower 3 and gun 5 are connected to hose 12
And a large amount of low-pressure air is supplied from the blower 3 to the gun 5 via the hose 12. Since the distance from the pump 2 to the gun 5 varies depending on the working conditions, the hose 10 can be extended as needed. On the other hand, the blower 3 can be carried by the worker,
Further, since the worker carries out the work by holding the gun 5, the length of the hose 12 is constant, and the hose 12 is a flexible hose so that the posture of the gun 5 can be arbitrarily changed. .

A tube shaft 11 is added to the gun 5 so that the worker can perform the coating operation in a standing posture, and the tube shaft 11 is supported so that the tube shaft 11 and the gun 5 can be supported by shoulders. A shoulder belt 19 is attached to 11. The gun 5 has an air guide pipe 15 and an air introduction pipe 17 branched diagonally from the air guide pipe 15 so that low-pressure air is introduced into the air guide pipe 15 through the pipe shaft 11 and the air introduction pipe 17. It has become. A high-viscosity material is supplied from the pump 2 into the air guide pipe 15 via the hose 10 and a hose 13 connected thereto. As will be described later in detail, the gun 5 has a material transfer pipe in the air guide pipe 15, and a high-viscosity material is blown out from a nozzle 16 at the tip of the gun 5. Low-pressure air is blown out from the surroundings.

Next, the gun 5 will be described in detail. 2 and 3, a connecting member 21 is attached to the rear end (the right end in FIG. 2) of the air guide pipe 15. The connecting member 21 is a tubular member having a hole 21a along the central axis, and has a flange 2 on the outer peripheral side at the center in the longitudinal direction.
4 and has a male screw 23 on the front side adjacent to the flange 24. The male screw 23 is screwed into the female screw 15a at the rear end of the pipe 15, and the flange 24 is pressed against the rear end of the pipe 15, The connecting member 21 is fixed to the rear end of the pipe 15. The end of the hose 13 is fitted to the outer periphery of the rear end side of the connecting member 21. A material transfer pipe 25 is inserted into the pipe 15. The material transfer pipe 25 is a fitting portion 25a whose rear end has an expanded diameter, and the inner peripheral surface 26 of the fitting portion 25a is fitted to the distal outer peripheral surface 22 of the connecting member 21. The inner peripheral surface 26 of the fitting portion 25a and the outer peripheral surface 22 on the distal end side of the connecting member 21 are tapered surfaces having the same angle, and both are fitted in close contact.

A flange 27 is integrally formed near the longitudinal center of the material transfer pipe 25, and a window hole 45 for passing low-pressure air is formed in the flange 27. The flange 27 is fitted on the inner periphery of the distal end of the pipe 15. The rear end of the nozzle 16 is fitted on the inner periphery of the front end of the pipe 15 from the front side of the flange 27. A relatively small flange 31 is formed on the outer periphery near the rear end of the nozzle 16, and this flange 31 faces the front end surface of the pipe 15 with a slight gap. An external thread 15b is formed on the outer periphery of the front end of the pipe 15, and the external thread 3b of the fixing ring 35 is formed on the external thread 15b.
5b is screwed. The fixing ring 35 has an inward flange 35a on the front end side, and the inward flange 35a presses the flange 31 of the nozzle 16 by screwing the fixing ring 35 into the pipe 15 as described above. The rear end presses the flange 27 of the material transfer pipe 25, and the fitting portion 2 at the rear end of the material transfer pipe 25
5a and the outer peripheral surface 22 on the distal end side of the connecting member 21 are fitted together by both tapered surfaces, so that the material transfer pipe 2
5, the nozzle 16, the pipe 15, and the connecting member 21 are substantially integrally connected.

The nozzle 16 has a tapered shape in which the rear end side has the same diameter and the front end side has a continuously decreasing diameter toward the front end.
At the very tip of. The hole inside the material transfer pipe 25 has substantially the same diameter as the hole 21a of the connecting member 21 and the hole of the hose 13, and communicates with the hole 21a of the connecting member 21 and the hole of the hose 13. Material transfer pipe 2
The inside of the tip of 5 is an outlet 28 for a high-viscosity material. The donut-shaped space in cross section between the inner peripheral surface of the pipe 15 and the outer peripheral surface of the material transfer pipe 25 forms a passage 30 for low-pressure air introduced into the gun 5 through the pipe shaft 11 and the air introduction pipe 17. A window hole 45 formed in the flange 27 of the material transfer pipe 25 is interposed in a part of the low-pressure air passage 30. Further, as described above, the nozzle 16 has a tapered shape in which the distal end side continuously decreases in diameter toward the distal end, whereas the outer diameter of the material transfer pipe 25 is substantially constant. Is narrow at the tip of the gun 5 and wide and substantially uniform in other areas. Nozzle 16 at the tip of gun 5
A low-pressure air outlet 33 is formed between the inner peripheral surface of the material transfer pipe 25 and the outer peripheral surface of the material transfer pipe 25, that is, on the outer peripheral side of the high-viscosity material outlet 28.

At the tip of the nozzle 16, a pair of angular projections 32, 32 are provided outside the tip of the material transfer pipe 25.
Are formed. As can be seen from FIG. 3, each of the protrusions 32, 32 is located symmetrically with respect to the center of the nozzle 16.
In addition, they are formed so as to face each other. And each projection 3
The inner surface of each of the projections 32 and 32 extends into the low-pressure air blowing passage so as to be resistant to the low-pressure air blown out from the air blowing port 33, and the front surface of each of the projections 32 and 32 extends forward. The lines are slopes that cross each other. In order for the flow of low-pressure air at the nozzle tip to be smooth, the outer peripheral surface of the tip of the material transfer pipe 25 is substantially in the same range as the tapered surface of the tip of the nozzle 16 and in the same direction as the taper of the nozzle 16, but The taper surface 25c has a small inclination angle.

Next, the operation of the above embodiment will be described.
As described with reference to FIG. 1, the high-viscosity material in the material tank 1 is sucked up by the pump 2 via the hose 9,
It is supplied to the gun 5 via the hoses 10 and 13. Gun 5
The high-viscosity material supplied to the hole 21a of the connecting member 21
The material is blown out from the material outlet 28 at an appropriate pressure through the hole of the material transfer pipe 25. The hole of the hose 13, the hole 21a of the connecting member 21, and the hole of the material transfer pipe 25 have substantially the same diameter, and the material outlet 2 of the material transfer pipe 25 has the same diameter.
Since the diameter of No. 8 does not change, even a highly viscous material is blown out smoothly.

On the other hand, a large amount of low-pressure air is supplied to the gun 5 from the blower 3 through the hose 12 and the pipe shaft 11. The low-pressure air supplied to the gun 5 is guided to an air guide pipe 15 via an air introduction pipe 17 and is supplied to the air guide pipe 1.
5 flows toward the tip of the gun 5 through the low-pressure air passage 30 formed between the inner peripheral surface of the material transfer pipe 25 and the outer peripheral surface of the material transfer pipe 25, and from the donut-shaped low-pressure air outlet 33, and thus the material outlet. 28 is blown out from the outer periphery. Since the nozzle 16 is tapered so that the diameter is continuously reduced toward the tip, the cross-sectional area of the low-pressure air passage 30 is continuously reduced toward the tip of the gun 5.
The low-pressure air outlet 33 at the tip of the gun 5 is the narrowest, and the rest is wide and has a substantially uniform cross-sectional area. Therefore, the low-pressure air smoothly flows through the passage 30, and the air blows out from the air outlet 33 in a vigorous manner and in a large amount, and travels toward the application object together with the high-viscosity material blown out from the material outlet 28.

By blowing the high-viscosity material together with the low-pressure air in this way, the high-viscosity material is atomized by the low-pressure air, sprayed onto the application target together with the low-pressure air, adheres to the application target, and adheres to the surface of the application target. A high viscosity material is applied. Since the high-viscosity material blown out from the material blowing port 28 and formed into fine particles is surrounded by the flow of the low-pressure air, the fine particles of the coating material do not scatter outside from the flow of the low-pressure air. Flow is low pressure, so that the coating material hardly rebounds from the coating surface. Therefore, there is almost no possibility that the worker inhales the fine particles of the application material and harms the respiratory system, the material is not wasted, and the material can be saved. Many effects can be obtained.

As described above, when low-pressure air is blown out from the air blowing port 33, the inner surfaces of the pair of projections 32, 32 become resistance to the low-pressure air, and the positions of the pair of projections 32, 32 are changed. The flow rate of the low-pressure air passing therethrough becomes faster than the flow rate of the low-pressure air passing through other positions, and the pressure drops only in that portion. There is a difference in the distribution of the air blowing angle due to the relationship between the pressure distribution and the balance between the atmospheric pressure and the blowing pattern becomes elliptical or elliptical. In the embodiment in which the pair of projections 32, 32 are formed at symmetrical positions with respect to the front end of the nozzle 16 with respect to the center axis as in the illustrated embodiment, as shown in FIG. It is possible to obtain a blowing pattern 40 that extends in the direction of a line passing through the centers of the projections 32,32. The reason why the blow-out pattern is a pattern that spreads in one direction is to increase the application range of the material and improve the efficiency of the application operation.

As described above, the embodiment described above is
It is a technology that enables application using high-viscosity materials by using the technology of low-pressure coating machines. There is a point devised in order to make possible application. One of them is to determine the cross-sectional area of the low-pressure air passage 30 in the gun 5 by the gun 5.
The cross-sectional area is narrow at the tip end of the, and wide and almost uniform in other areas. In this way, a large amount of low-pressure air efficiently flows in the gun 5, and the low-pressure air is blown out vigorously with the coating material at the air blowing port 33, and even a high-viscosity coating material is formed into fine particles for coating. It became possible. The material passage in the gun 5 has almost the same cross-sectional area up to the material outlet 28, and has a relatively large cross-sectional area, so that even a high-viscosity material can be smoothly transferred. This can contribute to the realization of the application of a high-viscosity material using mechanical force.

According to the configuration of the gun 5 shown in FIG.
Since the nozzle 16 and the material transfer pipe 25 can be connected only by tightening the fixing ring 35 to the pipe 15, the nozzle 16 and the material transfer pipe 25 can be removed only by loosening the fixing ring 35. 5 is extremely easy to maintain. Further, it is possible to easily cope with a case where the nozzle 16 and the material transfer pipe 25 are changed to another nozzle and a material transfer pipe having different specifications, such as a case of using a high-viscosity material having different characteristics. The nozzle and the material transfer pipe having different specifications are, for example, those having different overall lengths or those having different taper angles at the distal ends. Furthermore, according to the above-described embodiment, since the fitting surfaces of the connecting member 21 and the material transfer pipe 25 are the tapered surfaces 22 and 26 having the same inclination angle, these fitting surfaces are fitted to each other. In order to replace the material transfer pipe as described above, it is only necessary to insert and remove the material transfer pipe to and from the connecting member 21, and from this point, the connecting member 21 is replaced as necessary. The structure is easy.

In the embodiment described above, one gun 5 is used. However, in order to increase the coating efficiency,
Two guns may be used as in the embodiment shown in FIG. In FIG. 4, low-pressure air is supplied to two guns 5, 5 through a pipe shaft 11 and through two branched air introduction pipes 17, 17.
On the other hand, the high-viscosity material is supplied to the two guns 5, 5 via the hoses 13, 13 branched into two hands via the valve 44. The two guns 5, 5 are shown in FIGS.
And the guns are arranged in parallel with each other. The pipe shaft 11 is different depending on the height of the worker or whether the application target is a floor surface or the like under the feet,
It can be expanded or contracted depending on whether it is a vertical surface or the like. Reference numeral 42 denotes a tightening screw used when adjusting the length of the tube shaft 11. The pipe shaft 11 can be expanded and contracted by fitting large and small pipes.
By tightening 2, the large and small pipes are fixed to each other so that they cannot be expanded and contracted, and by loosening the tightening screw 42, the large and small pipes can be expanded and contracted. As the telescopic mechanism itself, a well-known telescopic telescopic trip mechanism can be used. The above hose 13 before branching
Is supported by a support member 43 fixed to the tube shaft 11.

[0023]

According to the present invention, a high-viscosity material supply pump, a blower for supplying low-pressure air, and a high-viscosity material supplied from the high-viscosity material supply pump and low-pressure air supplied from the blower are combined. The gun has a high-viscosity material outlet on the inside of its tip, a low-pressure air outlet on the outer peripheral side of the high-viscosity material outlet, and a low-pressure air passage in the gun. The cross-sectional area was narrow at the tip of the gun and wide and almost uniform at the other end, so that a large amount of low-pressure air efficiently flowed through the gun, and the low-pressure air was blown out with the coating material at the air outlet. In addition, even a high-viscosity coating material that could not be applied by mechanical force in the past can be made into fine particles and applied.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an embodiment of a high-viscosity material coating apparatus according to the present invention.

FIG. 2 is a sectional side view showing a configuration of a gun in the embodiment.

FIG. 3 is a front view of the same gun.

FIG. 4 is a side view showing another example of the gun applicable to the present invention.

[Explanation of symbols]

 2 High-viscosity material supply pump 3 Blower 5 Gun 28 High-viscosity material outlet 30 Low-pressure air passage 33 Low-pressure air outlet

Claims (2)

[Claims] A high-viscosity material supply pump, a low-pressure air blower, and a high-viscosity material supplied from the high-viscosity material supply pump and a low-pressure air supplied from the blower. The gun has a high-viscosity material outlet inside the tip thereof, and a low-pressure air outlet on the outer peripheral side of the high-viscosity material outlet, and has a cross-sectional area of a low-pressure air passage in the gun. Is a high-viscosity material coating device that has a narrow cross-section at the tip of the gun and a wide and almost uniform cross-section. 2. The high-viscosity material coating apparatus according to claim 1, wherein the high-viscosity material is a mixture of a plurality of materials in advance.