JP2005095710A - Dismantling treatment method for equipment with pcb sealed therein - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dismantling treatment method of efficiently post-treating cooling oil used when dismantling equipment with PCB sealed therein like a transformer or a capacitor by cutting with a saw. <P>SOLUTION: PCB is drawn out of the transformer in advance and stored in a draw out tank 25. When cutting a casing 11 and a core 14 of the transformer with a longitudinal cutting band saw 31 or a lateral cutting band saw 33, saw cutting is performed while pouring PCB stored in the draw out tank 25 to a cutting part as cooling oil. PCB used as the cooling oil is recovered and is made harmless by treatment like thermal decomposition treatment. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for dismantling a device such as a transformer or a capacitor in which PCB is enclosed.

  Polychlorinated biphenyl (PCB) is a general term for chlorides of biphenyl and is a mixture of 2, 3, 4, 5, 6 chlorides. PCBs are physically and chemically stable and have excellent electrical insulation and heat resistance, and thus have been used as insulating oil by being enclosed in electrical equipment such as transformers and capacitors.

  However, since PCB was found to be an environmental pollutant that is harmful to the human body and difficult to decompose in nature, its production has been discontinued, and products using PCB have been collected and stored strictly. Yes. Then, an immediate detoxification process for the PCB is desired.

  Therefore, technology development has been made to detoxify PCBs that are sealed as insulating oil inside electrical devices such as transformers and capacitors (see, for example, Patent Document 1). The basic processing procedure is to extract and collect a PCB from a transformer or the like, detoxify the collected PCB by thermal decomposition, and cut and disassemble the transformer or the like from which the PCB has been extracted.

At that time, because the PCB is partially attached to the inside of the transformer or the like from which the PCB has been removed, as a method of cutting the transformer or the like, cutting by gas or plasma laser is due to the generation of sparks. The adhering PCB is scattered, or the adhering PCB is incompletely decomposed due to local overheating, and toxic substances such as dioxin may be generated. Further, cutting by jetting high-pressure water is not preferable because a large amount of attached PCB is mixed in water. Therefore, as a countermeasure to the above problems, cutting with a machine tool such as a band saw or a milling machine is considered to be optimal because it is easy to handle without generating sparks.
JP-A-2-241586

  However, in Patent Document 1, when a transformer or the like from which a PCB has been extracted is cut with a band saw, cooling oil is applied to prevent the cutting portion from overheating. There is a problem in that PCB adhering to the inside of a vessel or the like is mixed, and the used cooling oil must be separated from the PCB and processed, which is troublesome and costly.

  The present invention has been made in order to solve the above-described problems, and it is possible to efficiently perform the post-treatment of the cooling oil to be used when the device in which the PCB is enclosed is cut with a saw or the like and disassembled. An object of the present invention is to provide a dismantling method that can be used.

  In order to solve the above problems, the present invention has the following features.

  [1] A method for disassembling a device enclosing a PCB, wherein the device includes a step of cutting the device while using the PCB as a cooling oil.

  [2] A method for disassembling a device in which PCB is enclosed, which includes a step of removing the PCB from the device and a step of cutting the device while using the PCB extracted in the previous step as cooling oil. A method for disassembling a device enclosing a characteristic PCB.

  [3] The method for disassembling a device enclosing the PCB according to [1] or [2], wherein in the step of cutting the device, the device is cut with a saw.

  In the present invention, when the transformer or the like from which the PCB has been previously extracted is cut, the cutting is performed while the extracted PCB is applied as a cooling oil to the cutting portion, so that overheating of the cutting portion can be prevented and Even if the PCB adhering to the inside of the vessel is mixed with the PCB used as the cooling oil, there is no problem that post-processing takes time and cost due to the mixing of the PCB as in the case of using normal cooling oil The dismantling process can be performed efficiently.

  An embodiment of a method for disassembling a device enclosing a PCB according to the present invention will be described by taking a case of disassembling a transformer as an example.

  FIG. 6 shows a typical transformer structure. In the figure, reference numeral 11 denotes a case, and a top plate 12 is provided on the upper part. A radiator 13 is attached to the side surface of the case 11. A PCB is enclosed inside the case 11, and a core 14 including an iron core 15 and a coil 16 is accommodated so as to be immersed in the PCB.

  FIG. 1 is a processing flow in this embodiment. 2-5 is explanatory drawing of the processing operation which becomes a point in the processing flow. The processing procedure will be described based on FIG. 1 and with reference to FIGS.

  (S1) First, as shown in FIG. 2, the punching device 21 punches the extraction hole 12a in the top plate 12 of the transformer to be processed.

  (S2) Next, as shown in FIG. 3, the extraction nozzle insertion device 22 is used to insert the extraction nozzle 23 into the extraction hole 12a, and the PCB enclosed inside the case 11 is extracted using the extraction pump 24. Pull out.

  (S3) The extracted PCB is stored in the extraction tank 25 and weighed. The stored PCB is appropriately sent to the next step (S6) using the pressure pump 26.

  (S4) On the other hand, the top plate 12 is removed from the case 11 after the PCB is extracted in (S2).

  (S5) Subsequently, the core 14 is extracted from the case 11 from which the top plate 12 has been removed.

(S6) Then, the top plate 12 removed in (S4), the core 14 extracted in (S5), and the case 11 after extracting the core 14 are respectively sawed into predetermined dimensions. At that time, saw cutting is performed while applying the PCB stored in the extraction tank 25 in (S3) to the cutting portion as cooling oil.
FIG. 4 is a diagram showing a state in which the case 11 is sawed. Here, the case 11 is cut by using a vertical band saw 31. Then, the PCB stored in the extraction tank 25 is sent to the cooling oil PCB supply device 32 provided in the vertical cutting band saw 31, and saw cutting is performed while the PCB is used as the cooling oil from the cooling oil PCB supply device 32 to the cutting portion. Like to do.
FIG. 5 is a view showing a state in which the core 14 is sawed. Here, the core 14 is cut using a transverse band saw 33. Then, the PCB stored in the extraction tank 25 is sent to the cooling oil PCB supply device 34 provided in the transverse band saw 33, and saw cutting is performed while the PCB is used as the cooling oil from the cooling oil PCB supply device 34 to the cutting portion. I am doing so.

  (S7) The PCB used as the cooling oil in (S6) is recovered in the recovery tank 35 as shown in FIGS.

  (S8) The PCB recovered in the recovery tank 35 is weighed again and collated with the measurement result in the extraction tank 25 in (S3), and then subjected to predetermined detoxification processing such as thermal decomposition processing.

  (S9) On the other hand, the case 11, the top plate 12, and the core 14 after the saw cutting in (S6) are chopped using a hydraulic shear or a manipulator cutter.

  (S10) The case 11 and the like shredded in (S9) are further crushed as necessary, and then sorted into irons, coppers, papers, trees, and the like.

  (S11) Finally, the selected irons, coppers, papers, trees, etc. are washed.

  As described above, in this embodiment, since the transformer is cut while applying the previously extracted PCB as a cooling oil to the cutting portion, overheating of the cutting portion can be prevented, and the transformer is Even if the attached PCB is mixed with the PCB used as the cooling oil, there is no problem that the post-processing is troublesome, so that the disassembling process can be performed efficiently.

  In the above embodiment, the PCB extracted from the transformer is used as the cooling oil for the transformer. However, the amount of PCB enclosed in the transformer varies depending on the type of the transformer. Alternatively, the PCBs extracted from a plurality of transformers may be collected and used as cooling oil. Alternatively, the PCB may be used while being circulated as cooling oil.

  Furthermore, in the above embodiment, a saw (band saw) is used to cut the PCB extracted from the transformer as a cooling oil while passing through the cutting part. However, in some cases, a machine tool such as a milling machine is used. Further, the PCB extracted from the transformer may be cut while being applied as a cooling oil (cutting oil) to the cutting portion.

  In the above embodiment, the transformer has been described as an example, but it is needless to say that the present invention can be applied to a dismantling process of a device such as a capacitor in which PCB is enclosed.

It is a processing flow figure in one embodiment of the present invention. In one Embodiment of this invention, it is a figure which shows the state drilled in the top plate of a transformer. In one Embodiment of this invention, it is a figure which shows the state which has extracted PCB from the transformer. In one Embodiment of this invention, it is a figure which shows the state which is sawing the case of a transformer. In one Embodiment of this invention, it is a figure which shows the state which is sawing the core of a transformer. It is a figure which shows the structure of a transformer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Case 12 Top plate 12a Extraction hole 13 Radiator 14 Core 15 Iron core 16 Coil 21 Punching device 22 Extraction nozzle insertion device 23 Extraction nozzle 24 Extraction pump 25 Extraction tank 26 Pumping pump 31 Vertical cut band saw 32 PCB supply device for cooling oil 33 Cross cutting band saw 34 Cooling oil PCB supply device 35 Recovery tank

Claims (3)

  A method for disassembling a device enclosing a PCB, wherein the device includes a step of cutting the device while using the PCB as a cooling oil.   A method for disassembling a device in which PCB is enclosed, which includes a step of removing the PCB from the device and a step of cutting the device while using the PCB extracted in the previous step as cooling oil. A method for disassembling a device enclosing PCB.   The method for disassembling a device enclosing the PCB according to claim 1 or 2, wherein in the step of cutting the device, the device is cut with a saw.

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