JP4473767B2 - Spray electrolytic polishing decontamination equipment - Google Patents

Description

  The present invention relates to an apparatus for decontaminating a metal product having a complicated constricted portion with a radioactive substance attached thereto by electropolishing. More specifically, the present invention relates to a spray-type electrolytic polishing decontamination apparatus that can be easily inserted into a constricted portion such as a pump impeller, can be used easily, and can reduce the amount of electrolyte used.

  Conventionally, when decontaminating the inside of a pipe or the like by electrolytic polishing, a negative electrode is inserted into the pipe, and this is immersed in an electrolytic solution to perform electrolytic polishing decontamination. In order to prevent such a conventional internal cathode from coming into direct contact with the object to be decontaminated and short-circuiting, insulators are radially attached around the internal cathode. For this reason, the part which can insert an internal cathode was restricted to the thing of comparatively simple shapes, such as piping. In addition, the cathode may come into contact with the object due to a lack of an insulator attached to the internal cathode, and there is a possibility that appropriate electrolytic polishing decontamination cannot be performed (see Patent Document 1).

In addition, since the conventional electropolishing decontamination using an internal cathode immerses the object in the electrolytic solution, an electrolytic bath suitable for the size of the object is required, and the decontamination object is completely immersed. Therefore, a large amount of electrolytic solution is required. As a result, the decontamination apparatus is increased in scale and used electrolytic solution is increased.
Japanese Patent Laid-Open No. 10-280200

  The present invention is different from the conventional electropolishing apparatus in which the space between the anode (object to be polished) and the cathode is performed via the electrolytic solution filled in the tank, and a flexible cathode portion is inserted. An electrolytic polishing apparatus having a compact configuration that allows electrolytic polishing to be performed by discharging an electrolytic solution from a hose provided with countless spray openings on the outer periphery to a narrow portion of an object to be polished (anode). The issue is to provide.

And
(1) To be able to be easily installed in a complicated constriction,
(2) Place the negative electrode in an insulating hose so that no short circuit occurs due to contact with the object to be decontaminated.
(3) Try to use as little electrolyte as possible,
(4) and enabling reduction of the amount of secondary waste generated with decontamination,
It is an object of the present invention to provide an electrolytic polishing decontamination apparatus that enables the above points.

By a combination of a flexible negative electrode wire connected to the negative electrode power cable and an insulating spray hose surrounding the negative electrode wire and having a plurality of electrolyte ejection openings on the peripheral surface A spray negative electrode hose was constructed.
Then, terminal caps are fixed to both ends of the negative electrode wire, and the end caps are fitted and inserted into the ends of the spray hose, the ends of the spray hose are sealed, and the electrolyte solution fed into the spray hose is used for spraying. The hose can be ejected from the opening.
In addition, a branch header having a plurality of branch connection portions is provided through a pipe to the electrolyte bath, a spray cathode hose is connected to the branch connection portion of the branch header, and the decontamination target side is The power supply cable for anode and the spray negative electrode hose side were connected to the power supply cable for negative electrode, so that a plurality of constricted portions could be simultaneously discharged with electricity.
In addition, a flow rate adjusting valve is provided in the vicinity of the connection portion between the spray hose constituting the spray negative electrode hose and the branching header so that the flow rate can be individually adjusted.

  Since the electrolyte can be ejected from a large number of openings provided in the spray hose that constitutes the spray negative electrode hose, the cathode part can be easily approached and decontaminated even in a complicated constricted part in the object to be decontaminated. it can.

  Electrolyte is sprayed directly from the multiple openings of the spray hose toward the narrowed part of the object to be decontaminated, so there is no need for a liquid tank for immersing a large object to be decontaminated. Can be less.

  As a result, the amount of used electrolyte solution can be reduced, and secondary waste can be reduced.

  This will be described with reference to the drawings. In FIG. 1, reference numeral 10 denotes a spray negative electrode hose according to the present invention. The spray negative electrode hose 10 includes a spray hose 11 and a negative electrode wire 12 arranged concentrically therewith. The negative electrode wire 12 has flexibility and is made of a highly conductive material such as stainless steel wire, and terminal caps 13 are fixed to both ends thereof.

  The spray hose 11 is a hose made of an insulating material such as rubber or plastic, and has a large number of openings 14 on the peripheral surface. The electrolytic solution is sprayed from the openings 14 to the outside (constriction or the like) during electrolytic polishing. Erupt.

  Both ends of the spray hose 11 are sealed by inserting the terminal cap 13 therein. The terminal cap 13 is fixed to the end of the negative electrode wire 12 with a crimping tool 15. In FIG. 2, reference numeral 16 denotes a hose band, which firmly tightens the insertion portion between the spray hose 11 and the terminal cap 13. Reference numeral 17 denotes a shrink tube that covers the tightening portion.

  The spray hose 11 is provided with a large number of openings 14 on the circumferential surface in the longitudinal direction, and the electrolyte sent into the spray hose 11 from these openings is discharged outward (narrowed portion). To do. This electrolytic solution comprises an acidic solution such as sulfuric acid and phosphoric acid, an alkaline solution such as sodium hydroxide, or a neutral electrolyte solution such as sodium nitrate.

  Back to FIG. 1, reference numeral 18 denotes a negative electrode power cable, and its tip is fixed to the end of the negative electrode cable 12 via a terminal cap 13 '.

  Thus, since the negative electrode cable 12 has a structure that can be concentrically accommodated inside the spray hose 11, even if the spray negative electrode hose 10 contacts the constricted portion of the object to be decontaminated, there is no short circuit. .

  Referring to FIG. 4, reference numeral 19 denotes a branching header, which is connected to the electrolyte tank 21 shown in FIG. In FIG. 4, seven spray negative electrode hoses 10 are connected to the branch header 19, but the number thereof is arbitrary. Reference numeral 21 denotes a flow rate adjusting valve, which can individually adjust the amount of electrolyte supplied to the spray cathode hose 10.

  As shown in FIG. 4, the electrolytic solution is fed into the spray hose 11 constituting the spray negative electrode 10 by the electrolytic solution supply pump 23, ejected radially from the spray opening 14 (FIG. 3), and decontaminated. The object 24 is sprayed. A plurality of spray negative electrode hoses 10 can be used by the branching header 19, and can be matched to the number of narrowed portions of the decontamination target 24. The amount of electrolyte supplied to each spray negative electrode hose 10 can be individually adjusted to an appropriate flow rate by the flow rate adjusting valve 21.

  The electrolytic solution is sprayed out from the spray opening 14 of the spray negative electrode hose 10 and sprayed onto the narrowed portion of the object 24 to be decontaminated. The electrolytic solution dropped after the decontamination object 24 is decontaminated is received by the electrolytic solution receiving tank 25, recovered by the electrolytic solution recovery pump 26, removed from the foreign matter by the filter 27, and returned to the electrolytic solution tank 22.

  While the electrolytic solution is circulating, the anode power cable 29 fixed by the anode terminal connector 30 (FIG. 5) is connected to the decontamination object 24, and the cathode electrode wire 12 in the spray hose 11 is connected. Electrolytic polishing is performed by connecting to the cathode power cable 18 and supplying current from a DC power source (not shown).

  As shown in FIG. 5, the upper decontamination hose 10a for decontaminating the upper surface of the object to be decontaminated (the turbine in the figure) and the lower decontamination hose 10b for decontaminating the lower surface of the decontamination object are decontaminated It is thin because it is not necessary to eject the electrolyte toward the entire circumferential surface as in the case of use.

  The spray negative electrode hose of the present invention has a remarkable effect particularly for use in the electrostriction of the stenosis. Therefore, the thickness or length of the spray hose is appropriately selected and used for decontamination sites on the upper surface or lower surface that are not constricted, and the direction or number of openings is also suitable for the state of the decontamination site. It is more economical to use things.

Spray negative electrode hose. Detailed view of the end of the spray negative electrode hose. A vertical section of a spray hose. The branch header part top view. The figure which shows the whole line outline | summary of a spray electrolytic polishing decontamination apparatus.

Explanation of symbols

10 Spray negative electrode hose
11 Spray hose 12 Negative electrode wire
13 ', 13 Terminal cap 14 Spray opening
15 Caulking tool 16 Hose band
17 Shrink tube 18 Cathode power cable
19 Branch header 20 Piping
21 Flow adjustment valve
22 Electrolyte tank 23 Electrolyte supply pump
24 Decontamination object 25 Electrolyte receiving tank
26 Electrolyte recovery pump 27 Filtration filter
28 Anode terminal connection jig 29 Anode power cable
30 Anode terminal connection jig

Claims (4)

A flexible negative electrode wire connected to the negative electrode power cable;
A spray negative electrode hose for a spray-type electrolytic polishing decontamination apparatus, characterized by comprising a combination with an insulating material spray hose surrounding the negative electrode wire and having a plurality of electrolyte solution ejection openings on the peripheral surface .   2. The spray-type electrolysis according to claim 1, wherein a terminal cap is fixed to both ends of the negative electrode wire, the terminal cap is fitted and inserted into an end of the spray hose, and the end of the spray hose is sealed with the terminal cap. Spray negative electrode hose for polishing decontamination equipment.   A branch header having a plurality of branch connection portions is provided through a pipe through the electrolyte bath, the spray negative electrode hose according to claim 1 is connected to the branch connection portion of the branch header, and further a decontamination target Spray type electrolytic polishing decontamination, wherein a plurality of constrictions can be decontaminated simultaneously by connecting the object side to the anode power cable and the spray negative electrode hose side to the negative electrode power cable. apparatus. 4. The spray type electrolytic polishing decontamination apparatus according to claim 3, wherein a flow rate adjusting valve is provided in the vicinity of a branch connection portion of the branch header of the spray hose constituting the spray negative electrode hose.

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