JPS62157556A - Foam blowing method for bubble detergent for permeating flaw detection agent and foam blow bun used therefore - Google Patents

Abstract

PURPOSE:To enable the blowing of a foam liquid free from ignition, by mixing a bubble cleaning liquid comprising surfactant, an organic solvent and water with a high pressure air to discharge it passing through a filter section. CONSTITUTION:A bubble cleaning liquid E comprises 0.1-40wt% of a surfactant, 60-99.9wt% of an organic solvent and water (the ratio by weight between organic solvent and water is 1:9-9:1). The liquid E and a high pressure air are jetted into a introduction hole section 2 to scatter the high pressure air into a number of foams F. Then, the mixture thus obtained is passed through a filter section 7 to finely divide the foam F and discharged at a small-dia. blow off port 10. According to this method, the liquid is blown being forced to foam by a high pressure air thereby eliminating a danger of ignition by a foaming agent thereby improving the working environment.

Description

[Detailed Description of the Invention] [Technical Field] The present invention is capable of spraying a cleaning solution used in dye penetrant testing while foaming, streamlining cleaning work, increasing cleaning efficiency, and preventing dangers such as ignition. The present invention relates to a foam spraying method and a foam spraying gun for use in a foam cleaning solution for penetrant testing agents that can be useful even to the disadvantaged in the working environment.

[Conventional technology]

Dye penetrant testing is often used to inspect concave defects on the surface of inspected objects such as materials and products.

Also, in this method, as shown in FIGS. 6 and 7, for example, after applying the penetrant B to the surface of the cleaned object A, the surface is wiped with a cleaning solution and a developer C is applied. By applying it, the penetrant B inside the concave defect is sucked out and the developer C changes color, thereby detecting the defect.

In addition, to improve the workability when cleaning the penetrant using a cleaning solution by wiping it by hand with a cloth, and to prevent over-washing in which the penetrant is also removed from defects when the cleaning solution is directly sprayed. Japanese Patent Publication No. 12353/1983 proposes a type of cleaning liquid that foams as it is sprayed.

In addition, this foaming cleaning liquid contains 0.1 to 40% by weight of surfactant, and the total amount of organic solvent and water is 60 to 99.9 Wit, with a weight ratio of organic solvent to water of 1:9 to 9:1. It is characterized by containing %.

However, when spraying this cleaning liquid, as described in page 2, column 4, lines 23 to 28 of the above-mentioned publication, liquefied petroleum gas, dimethyl ether, or fluorocarbons, etc., are used as a propellant or blowing agent of 0.2 to 1.2 (by volume). So-called aerosol spraying is carried out by adding a mixture of liquids (ratio) and sealing the container with a button.

[Problem that the invention seeks to solve]

However, when foaming or spraying using the above-mentioned propellants or foaming agents, liquefied petroleum gas etc. are flammable, impairing the working environment, and requiring great care to prevent danger, such as ventilation of the room, etc. In addition to fire prevention, safety and hygiene precautions are required. Furthermore, the use of fluorocarbons is also restricted due to pollution concerns.

The present invention solves the above problems by making it possible to foam and spray a foam cleaning agent using high-pressure air. Spraying is intended to provide a gun.

Means for Solving Problems c] The present invention provides an organic solvent and water solution in which the surfactant is contained in an amount of 0.1 to 40%, and the weight ratio of the organic solvent to water is 1:9 to 9:1. A foam cleaning solution for penetrant probe (m opening) containing 60 to 99.9% by volume is mixed with high pressure air, and this mixture is passed through the filter section 7, and this passing body is passed through a small diameter outlet. A foam spraying method of a foam cleaning liquid for a penetrant flaw detection agent is discharged from a gun 10, and a foam spraying gun 1 is used for the foam spraying method.

As the foam cleaning agent, those disclosed in Japanese Patent Publication No. 54-12353 can be used. In addition, as surfactants for this foam cleaning agent, nonionic, anionic, cationic,
Various amphoteric groups can be used, and as organic solvents, for example, hydrocarbons, esters, phosphorus compounds, etc. are used.

In addition, in order to mix with the high pressure air, the foam cleaning agent E and the high pressure air are discharged into the small chamber-shaped guide hole portion 2.

The high-pressure air is stirred and mixed with the foam cleaning agent E, and as shown in FIG. 1, a large number of air bubbles F are scattered within the foam cleaning agent E.

This mixture is also passed through the filter section 7.

The filter section 7 is made of a mesh, a sintered body, etc. of about 300 to 1200 meshes, preferably about 500 to 700 meshes, and makes the air bubbles F of the mixture finer as they pass through, so that the fine air bubbles are uniformly mixed. It is possible to form a passing body.

Further, this passage body is discharged through a small-diameter outlet 1o. Note that the passage body is pressurized by being narrowed by the small-diameter outlet 1o, and is injected.

Although the fine bubbles grow as the pressure is removed, they are sprayed onto the object A to be inspected as a foam having bubbles F of a desired particle size. In addition, small bubbles are difficult to burst,
The surface tension covers the surface of the object to be inspected A and efficiently cleans it. Moreover, since it is made of foam, over-washing, which would also remove the penetrant in the defects, is prevented. Note that as time passes, the bubbles break and the bubbles grow and flow down. Note that the cleaning power is increased by the foam breaking, and since the foam is foamed by air, it is possible to prevent the occurrence of pollution.

Furthermore, when feeding the mixture into the filter section 7, it is preferable to provide a constriction section 1) at the tip of the guide hole section 2 to pressurize the mixture and crush large air bubbles. ) may be added to the barrier wall 12 to further atomize the air bubbles before passing through the filter section 7.

Foam spraying of such a foam cleaning agent can be performed using gun 1.

In the figure, for foam spraying, gun 1 has a liquid port 3 and an air port 4.
A metal tip 6 having a filter part 7 is attached to the other end of the guide hole 2 which is open at one end, and the metal tip 5 is attached to the other end of the guide hole 2.
It is surrounded by an outer metal fitting 6 having a small-diameter outlet 10 at its tip, and in this example, the foam spraying gun 1 has a main body part 21 that is pistol-shaped and can be held in hand, and a long handle having a joint part 22. It is formed as a cancer.

The main body 21 has a trigger 29 in a pistol-shaped case having a head 25 at the tip of the body 24 and a handle 26 at the rear end. The trigger 29 hangs down in the space between the head 25 and the handle 26, and when pulled by the trigger 29, an air opening/closing valve 31 opens and closes the air passage 30, and a needle valve opens and closes the paint passage 32. Open 33. The air passage 30 guides air from a high-pressure air source such as a compressor connected to the nipple 28 at the lower end of the handle 26 to a hole 34 that opens above the tip of the head 35.

The paint flow path 32 also communicates with the center hole 36 of the head 25 via a side hole from the nipple 35 of the head 25 .

Furthermore, a paint nozzle 39 is attached to the tip of the head 25, and an M paint nozzle 39, the liquid port 3,
The connecting pipe portion 22 is provided between a nozzle fitting 41 for forming the guide hole portion 2 having the air port 4 at one end and a sleeve 42 into which the nozzle fitting 42 is inserted.

The joint section 22 includes an inner tube 45 and an outer tube 46 that is inserted into the inner tube 45 with a gap, and the inner tube 45 is made of copper, SLJ.
The outer tube 46 is formed using a synthetic resin tube such as polyamide or polyacetal resin.

The paint nozzle 39 is fixed to the head 25 by pressing a peripheral flange 49 against the tip of the head 25 via a cap nut 50. Further, an inner hole 52 is formed in the center thereof, and is provided with a valve seat 51 on which the needle valve 33 passing through the paint flow path 32 approaches and separates, and the rear end of the inner tube 45 is screwed into the inner hole 52. Ru.

Further, the paint nozzle 39 has a ring portion 55 provided with a circumferential groove into which the outer tube 46 is inserted, and a ring portion 55 is formed on the front surface of the paint nozzle 39.
The inner circumferential surface of 5 is connected to the inner tube 45 through an oblique hole 56 to the hole 34, and an air flow path 30 is extended between the inner tube 45 and the outer tube 46. A circular hole 56 is formed. A cap nut 57 is screwed onto the ring portion 55, and the cap nut 57 can fix the outer tube 46 by compressing the outer tube 46 with a seal. Also, inner pipe 45, outer pipe 46
is fixed to the sleeve 42 using a fitting 60.

As shown in FIGS. 3 and 4, the fitting 60 has a boss 64 at the tip of the hexagonal part 61, which has a threaded hole into which the inner tube 45 is screwed with its tip protruding, and has an external thread. in front,
Also, a ring portion 65 is provided with a circumferential groove for fitting the outer tube 46 on the back surface.
form. Further, the ring portion 65 can have a circular hole 66 provided with a gap between it and the inner tube 45 on its inner peripheral surface. The circular hole 66 passes through an inner circumferential groove 67 provided in the hexagonal portion 61 and communicates with a plurality of small-diameter through holes 69 that open at the tip of the boss 64, and the boss 64 is threaded into the rear end of the sleeve 42. It will be worn.

The sleeve 42 also has a small-diameter threaded cylindrical portion 74 formed at the tip of a cylindrical base 73, and a threaded portion 75 into which the boss 64 is screwed into the center thereof through the small-diameter constricted portion 1). An inner hole 79 communicating with the threaded hole 77 in the threaded cylinder portion 74 is formed.

Further, the nozzle fitting 41 has an inner tube 45 protruding from the fitting fitting 60.
The liquid port 3 having a small diameter is formed at the tip of the center hole 90 having a screw hole that is screwed into the center hole 90 . Further, the nozzle fitting 41 can be inserted relatively tightly into the inner hole 79, and a circumferential groove 92 is provided on its circumferential surface. In addition, a vertical groove 94 connecting the circumference a92 and the back surface is provided in the rear part of the circumferential groove 92, and in the front part,
Two spiral grooves 95 and 95 are provided which open at the tip to form the air port 4 and which communicate with the circumferential groove 92 at the rear. The nozzle fitting 41 is connected to the constricted portion 1 of the sleeve 42.
), the air port 4 is located behind the nozzle fitting 41, so that between the end of the nozzle fitting 41 and the constriction part 1),
The guide hole portion 2 in which the liquid port 3 and the air port 4 are opened is formed.

Further, the tip metal fitting 5 is attached to the threaded cylinder portion 74, and the tip metal fitting 5 is surrounded by the outer metal fitting 6.

In this example, the tip fitting 5 is connected to the threaded cylindrical portion 7 of the sleeve 42.
The tip of the cylindrical part 9 which is screwed into the cap body 8 and whose inner hole communicates with the constricted part 1) is inserted into the cap body 8 and the cap body 8, which is sealed using a blocking wall 12, to form the filter part 7. The blocking wall 12 has a flange 97 projecting from the outer peripheral surface of the cylindrical portion 9 around the flange 97 . Further, the flange 97 is provided with a groove 99 extending from the outer peripheral surface of the cylindrical portion 9. In addition, the front surface of the blocking wall 12 is formed into a middle opening, and the cylindrical portion 9 has a large number of small holes 13-- passing through the inner and outer surfaces.
are installed in parallel. Further, the filter agent 14 has one end locked in the groove 99 on the outer surface of the cylindrical portion 9, and the other end locked in the sleeve 42.
The filter portion 7 is formed in the cap body 8 by being brought into contact with the front surface and inserted externally. Note that the filter material 14 has a thickness of 30
It has a mesh size of 0 to 1200 meshes, preferably 500 to 700 meshes, and in this embodiment, about 600 meshes, and is formed using a wire mesh body, a sintered body, etc., and when attached, covers the small holes 13. .

The outer metal fitting 6 also has a base cylinder part 10 that can be screwed into the outer periphery of the threaded cylinder part 74 of the sleeve 42 and extends beyond the tip of the tip metal fitting 5.
0 is provided with a tapered part 101 having the small-diameter outlet 10 at its tip, and surrounds the tip fitting 5 with a gap.

For foam spraying, the gun 1 has the nipple 28 connected to a high-pressure air source such as a compressor, and the other nipple 35 connected to the gun 1.
Connect a paint cup, liquid pump, etc. containing foam cleaning agent E to the container.

In addition, when the trigger 2'9 is pulled, the air on/off valve 31 opens the air passage 31, and the air passes through the hole 34, the oblique hole 53, between the inner tube 45 and the outer tube 46, etc., and the air flows through the I! ! ! ! Passing through the whirlpool 95,
High-pressure air is blown out from the air port 4 into the guide hole portion 2 . Also, needle valve 33 is a valve! By opening 51, from the paint flow path 32,
The foam cleaning liquid E is discharged from the liquid port 3 through the inner pipe 45 and the nozzle fitting 41. Also, the ejected high-pressure air sucks the foamy cleaning agent E, stirs and mixes it within the guide hole 2, and mixes air bubbles F in the foamy cleaning agent E to form a mixture. .

Further, by having the constriction part 1), the foam cleaning agent E and the high-pressure air are pressurized to promote mixing, and the large bubbles F are reduced in diameter. Furthermore, by ejecting the liquid into the large-diameter cylindrical portion 9, the stirring effect is further enhanced.

Further, due to the collision with the barrier wall 12, the bubbles F of the mixture become finer and evenly dispersed.

Further, by passing through the filter section 7, the mixture is further uniformly atomized and dispersed. Further, this passing body passes through the gap and is ejected from the outlet 10.

Since the foam cleaning agent E contains surfactants, organic solvents, etc., it can be sprayed onto the surface of the inspected object A while maintaining bubbles, and the penetrating liquid C on the surface is removed while leaving the penetrating agent B in the defective area. The surface can be cleaned. In addition, since the bubbles are fine particles, they are difficult to break, and the cleaning effect is enhanced by the bubbles breaking and flowing down while becoming larger in diameter.

Further, since the foam cleaning agent E is ejected, the cleaning effect of the penetrating agent B is enhanced by its ejection force. After cleaning, leave it as is to dry.

For foam spraying, the gun 1 can be formed as a hand gun or an automatic gun that can be remotely controlled.
As shown in the figure, the gun of the present invention can be modified in various ways, such as being entirely formed using a filter material 14 and being able to be attached using a nut fitting 15.

〔Effect of the invention〕

In this way, the foam spraying method of the present invention applies a foam cleaning agent to
It can be sprayed while foaming with high-pressure air, eliminating the risk of ignition caused by the spraying material or foaming material, and improving the work environment. It also reduces management effort and improves surrounding hygiene. It also makes it easier to clean large areas.

In addition, the foam spraying gun of the present invention has a metal tip having a filter section and an outer metal fitting surrounding the metal tip attached to the other end of the guide hole having a liquid port and an air port. It is possible to uniformly disperse the air bubbles and the air bubbles, and to spray the air bubbles while making them fine particles. Therefore, bubble breakage can be reduced, the cleaning effect can be enhanced, and the force of spraying can also increase the cleaning effect of the object to be inspected. In addition, compared to using a hand wipe or an aerosol can, it is easier to spray a large amount of foam cleaning agent continuously, and it has many effects such as improving work efficiency.

[Brief explanation of drawings]

Figures 1 and 2 are diagrams illustrating the method of the present invention, Figure 3 is a sectional view showing an embodiment of the foam spraying gun, and Figure 4 is a perspective view illustrating the tip of the foam spraying gun. , FIG. 5 is a sectional view showing another embodiment of the tip metal fitting, and FIGS. 6 to 8 are diagrams explaining the dye penetrant flaw detection method. 2.-Inductor hole part, 3..--Surface port, 4-..Air port,
5-Tip fitting, 6-Outer metal fitting, 7...Filter part, 9-Cylinder part, IO-Blowout port, 1)--Aperture part, 12...Bullet wall, 13...Small Hole, A-
・-Object to be inspected, B--Penetrant material, C--Developer,
D.--Defect, E.--Foam cleaning agent. Patent applicant: Meiji Machinery Co., Ltd. Mitsubishi Heavy Industries, Ltd. Nippon Oil & Fats Co., Ltd.

Claims (2)

[Claims] (1) The surfactant is 0.1-40% by weight, the weight ratio of organic solvent and water is 1:9-9:1, and the total amount of organic solvent and water is 60-99.9% by weight. A foam cleaning liquid for penetrant testing agents, characterized in that the foam cleaning liquid for penetrant testing agents is mixed with high-pressure air, the mixture is passed through a filter section, and the passing body is further discharged from a small-diameter outlet. Foam spraying method. (2) A liquid port through which the foam cleaning liquid for penetrant testing agent flows in and an air port through which high-pressure air is ejected are open at one end, and a filter portion is provided at the other end of the channel that communicates with the channel. A foaming spray gun for spraying a foam cleaning liquid for a penetrant flaw detection agent, in which a metal tip is attached, and the metal tip is surrounded with a gap by an outer metal fitting having a small-diameter outlet at the tip.