JP4038426B2 - Automatic penetration inspection method for steel sheet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steel plate automatic penetrant inspection method for efficiently and automatically carrying out a penetrant inspection of a steel plate in a steel sheet manufacturing process.
[0002]
[Prior art]
[Patent Document 1]
Japanese Patent Laid-Open No. 9-257724 (paragraph 0004, FIG. 3)
[Patent Document 2]
Japanese Utility Model Publication No. 57-142350 gazette
A penetration testing (PT) method is known as a method for inspecting a surface flaw of a steel plate called a thick plate having a thickness exceeding 3 mm. In this penetrant inspection method, as shown in Patent Document 1, a penetrating liquid is applied to the surface of a cleaned steel plate to penetrate the inside of the flaw, and then the penetrant is sucked up from the inside of the flaw by a developer to lift the flaw. This is a method of performing visual inspection.
[0004]
In practice, a steel plate to be inspected is horizontally installed in the work place, and the surface of the steel plate is washed manually with a waste cloth, water and thinner, and dried over 20 to 30 minutes. Next, the penetrating liquid is applied with a brush, dried again over 20 to 30 minutes, and allowed to penetrate into the wound. Next, water washing is performed to remove the penetrating solution from the surface, and after drying for 5 to 10 minutes, a developer is applied with an air gun. Then, after waiting for development for 20 to 30 minutes, visual inspection is performed. The conventional manual work procedure is shown in FIG.
[0005]
As described above, in order to carry out the penetrant inspection method manually, an operator is required in addition to the inspector, and it is an inefficient operation requiring a long time. there were. Therefore, as shown in Patent Document 2, a cleaning liquid nozzle, an air nozzle, a permeating liquid nozzle, a developing liquid nozzle, and the like are mounted on a carriage that reciprocates directly above a steel plate to be inspected, and a series of operations until development is automatically performed. A device has been developed. However, when carrying out such automatic penetration inspection of steel sheets, prevention of dripping of washing water, improvement of the efficiency of the drying process, and prevention of clogging of the developer nozzle have become major issues.
[0006]
That is, although the drying process is started after the cleaning process is completed, the surface of the steel sheet cannot be uniformly dried when a liquid sag occurs from the cleaning liquid nozzle and a water droplet falls on the steel sheet. For this reason, the subsequent application of the penetrant cannot be performed uniformly, and an accurate inspection becomes impossible. In addition, even when liquid sag occurs from the permeating liquid nozzle, since the permeated liquid is a deep red color, when the developer is applied, the liquid sag portion and the red color of the scratch cannot be distinguished, and accurate inspection is not possible. It becomes possible.
[0007]
In addition, since the steel plate is horizontal when drying by the air nozzle, there is also a problem that the liquid only moves left and right on the steel plate and is not removed in a short time, and it takes a long drying time. Further, the developing solution is a volatile liquid containing white powder, and there is also a problem that nozzle clogging is likely to occur while spraying is stopped. When nozzle clogging occurs, a predetermined amount of developer cannot be applied, which hinders accurate inspection. As described above, there are many problems to be solved in order to put the automatic penetration inspection of steel sheets into practical use.
[0008]
[Problems to be solved by the invention]
The present invention solves the above-described conventional problems, and is a problem in putting automatic penetration inspection of steel sheets into practical use. Prevention of dripping of washing water and penetrating liquid, efficiency of drying process, developer nozzle The present invention has been made to provide an improved automatic penetrant inspection method for steel sheets that can prevent clogging.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention of claim 1 is such that the permeation liquid is applied to the surface of the cleaned steel sheet, the surface is cleaned and dried, and then the developer is applied to stain the scratch. In the automatic penetrant inspection method for steel plates, the steel plate surface is cleaned using a cleaning nozzle provided at the lower end of a pipe extending spirally from the header for supplying cleaning liquid to the upper side of the header, and at the end of cleaning The liquid droplets at the tip are blown off by air blow to prevent dripping from the cleaning nozzle. According to the present invention, dripping of the cleaning liquid can be reliably prevented.
[0010]
The invention of claim 2 adds the requirement that the steel plate is inclined from the horizontal plane and the efficiency of drying by air blowing from the air nozzle is increased to the invention of claim 1. According to this invention, the liquid can be quickly dropped from the surface of the steel sheet, and the drying process can be made efficient.
[0011]
According to a third aspect of the invention, the penetrating liquid is applied using a one-fluid fan-shaped nozzle, and the inside of the nozzle is blown at the standby position after the penetrating liquid is applied to prevent dripping of the remaining liquid from the penetrating liquid nozzle. The requirements are added to the invention of claim 1. According to this invention, it is possible to reliably prevent dripping of the penetrating liquid.
[0012]
Further, the invention of claim 4 has a requirement that the application of the developer is performed using an atomizing nozzle, and the nozzle is blocked by water replacement at the standby position after the application of the developer. It is added to the invention. According to the present invention, the clogging of the developer nozzle can be reliably prevented.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described.
FIG. 1 is an overall view showing a preferred embodiment of the present invention, and FIG. 2 is a side view thereof. In these drawings, reference numeral 1 denotes a rail, on which a portal-type traveling carriage 2 is installed. The traveling carriage 2 includes traveling means (not shown) and can reciprocate on the rail 1. As shown in FIG. 2, the steel sheet S is placed on the pedestal 3 and arranged in the center of the rail 1. The steel plate S is inclined about 2 to 10 ° with respect to the horizontal plane.
[0014]
An elevating head 4 is mounted on the traveling carriage 2 by an elevating means 5 so as to be movable up and down. A cleaning nozzle 6, an air nozzle 7, a permeating liquid nozzle 8, and a developing liquid nozzle 9 are respectively attached to the lower surface of the elevating head 4, and are connected to a tank or a pump mounted on the traveling carriage 2. . While traveling on the steel sheet S, the traveling carriage 2 sequentially performs the steps of steel sheet cleaning, drying, penetrating liquid application, drying, water cleaning, drying, developer application, and drying. The final inspection after drying is performed visually.
[0015]
FIG. 3 is a perspective view showing the cleaning nozzle 6. The cleaning liquid is supplied from the cleaning liquid tank 10 to the header 12 by the cleaning liquid pump 11, and pressurizing air is supplied from the compressor 13 to the header 12. The header 12 extends in the width direction of the steel plate S, and a large number of cleaning nozzles 6 are attached. As shown in FIG. 3, in the present invention, the pipe 14 closest to the cleaning nozzle 6 is formed in a vertical spiral shape extending around the upper side of the header 12 .
[0016]
The cleaning nozzle 6 is used for initial surface cleaning and surface cleaning after the permeation liquid application, and the timing of cleaning liquid injection is controlled by electromagnetic valves 15 and 16 shown in FIG. And even if these solenoid valves 15 and 16 are closed after the end of cleaning, it is not possible to prevent the cleaning liquid in the pipe from gradually flowing down. However, if the pipe 14 immediately adjacent to the cleaning nozzle 6 is formed in a spiral shape in the vertical direction, the cleaning nozzle 6 does not drop from the cleaning nozzle 6 unless the level of the flowing cleaning liquid reaches a position higher than the header 12.
[0017]
In addition, an air pipe 17 is disposed in the vicinity of each cleaning nozzle 6, and at the end of cleaning, droplets at the tip of each cleaning nozzle 6 are blown and blown away. As a result, it is possible to reliably prevent the cleaning liquid from dripping from each cleaning nozzle 6 after the cleaning is completed, and it is possible to eliminate the trouble caused by the dropping of the cleaning liquid as described above.
[0018]
FIG. 4 is a view showing the drying air nozzle 7, and compressed air is supplied from the compressor 13 via the electromagnetic valve 18. The air nozzle 7 is preferably a slit nozzle, and air is sprayed onto the surface of the steel sheet S in order to dry the cleaning liquid, permeation liquid, developer, and the like. Conventionally, the steel plate S has been installed horizontally, but in the present invention, the steel plate S is inclined by about 2 to 10 ° from the horizontal plane so that the air blown liquid can be quickly dropped. This makes it possible to shorten the drying time. In addition, as shown in FIG. 4, it is preferable that the air nozzle 7 is also inclined in parallel with the steel plate S to keep the distance constant.
[0019]
FIG. 5 shows a permeate supply system to the permeate nozzle 8. The permeate is sent from the permeate tank 19 to the header 21 by the permeate pump 20 and distributed to the permeate nozzle 8. The permeating liquid nozzle 8 is preferably a one-fluid fan nozzle, and an electromagnetic valve 22 is disposed in the immediate vicinity of each permeating liquid nozzle 8. Each penetrant nozzle 8 is connected to an air header 24 via a check valve 23.
[0020]
The osmotic liquid is applied by spraying the osmotic liquid from the osmotic liquid nozzle 8. After the osmotic liquid is applied, the electromagnetic valve 22 is switched at the standby position, and air is supplied from the air header 24 to the osmotic liquid nozzle 8. Air blow inside. As a result, the residual liquid in the permeating liquid nozzle 8 is removed and dripping onto the steel sheet S is prevented. Since the electromagnetic valve 22 is disposed in the immediate vicinity of each osmotic liquid nozzle 8, the residual liquid in the osmotic liquid nozzle 8 after the electromagnetic valve 22 is closed is very small and can be completely removed by air blowing. Thereby, the trouble by the penetrating liquid being dripped on the steel plate S is prevented.
[0021]
FIG. 6 is a diagram illustrating a developer supply system to the developer nozzle 9. The developer is sent from the developer tank 25 to the header 27 by the developer pump 26 and is distributed to each developer nozzle 9. Each developer nozzle 9 is an atomizing nozzle, and atomized air is supplied from the compressor 13 to spray the developer onto the surface of the steel sheet S. Excess developer is returned to the developer tank 24 via the return head 28.
[0022]
As illustrated, a cleaning pipe 31 including a cleaning liquid tank 29 and a cleaning liquid pump 30 is connected between the developer pump 26 and the header 27. Then, after applying the developing solution, the electromagnetic valves 32 and 33 are switched at the standby position, the supply of the developing solution is stopped, and the cleaning water is supplied from the cleaning pipe 31 to each developing solution nozzle 9, and the header 27 and the developing solution nozzle 9 are connected. Replace the inside with water. As a result, it is possible to prevent clogging of each developing solution nozzle 9 in standby.
[0023]
【The invention's effect】
As described above, according to the present invention, it is possible to reliably prevent liquid sag from the washing nozzle and the permeating liquid nozzle. Moreover, a liquid can be quickly dropped from the surface of the steel plate S, and the drying process can be made efficient. Further, the clogging of each developer nozzle can be prevented. As described above, according to the present invention, it is possible to solve the conventional problems in the case of carrying out automatic penetration inspection of a steel sheet, and it is possible to automatically and efficiently perform the penetration inspection of a steel sheet.
[Brief description of the drawings]
FIG. 1 is an overall view showing a preferred embodiment of the present invention.
FIG. 2 is a side view showing a preferred embodiment of the present invention.
FIG. 3 is a perspective view showing a cleaning nozzle.
FIG. 4 is a side view showing an air nozzle for drying.
FIG. 5 is a system diagram of a permeate supply to a permeate nozzle.
FIG. 6 is a system diagram for supplying a developing solution to a developing solution nozzle.
FIG. 7 is a block diagram showing a procedure of penetrant flaw inspection by manual work.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rail 2 Traveling carriage 3 Stand 4 Lifting head 5 Lifting means 6 Cleaning nozzle 7 Air nozzle 8 Osmotic liquid nozzle 9 Developer liquid nozzle 10 Cleaning liquid tank 11 Cleaning liquid pump 12 Header 13 Compressor 14 Piping 15 near the cleaning nozzle Electromagnetic valve 16 Electromagnetic valve 17 Air pipe 18 Solenoid valve 19 Osmotic liquid tank 20 Osmotic liquid pump 21 Header 22 Electromagnetic valve 23 Check valve 24 Air header 25 Developer liquid tank 26 Developer liquid pump 27 Header 28 Return head 29 Cleaning liquid tank 30 Cleaning liquid pump 31 Cleaning pipe 32 Electromagnetic valve 33 Solenoid valve

Claims (4)

In the automatic penetrant inspection method for steel sheets, the permeate is applied to the cleaned steel plate surface, the surface is washed and dried, and then the developer is applied to stain the surface. The steel plate surface is cleaned using a cleaning nozzle provided at the lower end of a pipe extending spirally so as to go around the upper side of the pipe, and droplets at the tip of the nozzle are blown off by air blow at the end of cleaning to prevent dripping from the cleaning nozzle An automatic penetration inspection method for steel sheets characterized by the above.   The steel plate automatic penetrant inspection method according to claim 1, wherein the steel plate is inclined from a horizontal plane, and the efficiency of drying by air blowing from an air nozzle is increased.   2. The steel plate automatic according to claim 1, wherein the penetrating liquid is applied using a one-fluid fan-shaped nozzle, and the remaining liquid from the penetrating liquid nozzle is prevented from dripping by air blowing inside the nozzle at the standby position after the penetrating liquid is applied. Penetration inspection method.   The steel plate automatic penetrant inspection method according to claim 1, wherein application of the developer is performed using an atomizing nozzle, and the nozzle is blocked by water replacement at a standby position after application of the developer.

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