JP2020057697A - Transformer disassembly method, transformer disassembly jig, and transformer disassembly cutting device - Google Patents

Abstract

To provide a transformer disassembling method capable of reducing the labor of an operator, lowering the frequency of work at high places as compared with the prior art, and improving safety.SOLUTION: A method of disassembling a transformer body after an exterior part is removed by discharging and processing PCB when containing an insulating oil or a PCB included in an insulating oil, includes: a casing upper part cutting step S020 of cutting and removing the upper part of a casing constituting the transformer body to open an internal element; a coil upper part cutting step S060 of bonding an upper yoke and an iron core which are internal elements constituting the casing and the transformer main body via a jig after the casing upper part cutting step; and a coil middle part cutting step S120 of bonding the casing and the iron core via the jig, and cutting and removing the casing and the jig as an integrated body after the coil upper part cutting step.SELECTED DRAWING: Figure 6

Description

  The present invention relates to disassembly of a large transformer, and more particularly to a transformer disassembly method capable of reducing labor required for disassembly work, a transformer disassembly jig, and a transformer disassembly cutting device.

  As a technique related to disassembly of a large transformer, those disclosed in Patent Literature 1 and Patent Literature 2 are known. The technique disclosed in Patent Literature 1 relates to a technique for separating a coil from an iron core by cutting the coil in a vertical direction (a direction along the iron core) using a band saw or the like. In Patent Literature 1, the iron core is fixed by the pressing plate, and the cutting position is determined by the saw blade using the guide so that the saw blade does not touch the iron core. I try to prevent that.

  The technique disclosed in Patent Literature 2 is a technique of using PCB (polychlorinated biphenyl) enclosed in a casing as a cooling oil when cutting a transformer using a band saw or the like. Further, Patent Literature 2 discloses that a casing, an iron core, and the like constituting a transformer are separated and then individually cut.

JP 2003-217956 A JP 2005-95710 A

  As disclosed in Patent Literatures 1 and 2, in the disassembly of a large transformer, it is common practice to separate each component, then chop the separated component, and carry out the removal. I have. However, the work of separating the components of the heavy load requires a large amount of labor, and the work such as hanging or hanging at a high place is frequently performed, which involves danger.

  The present invention provides a transformer disassembly method that can reduce the labor of the operator, reduce the frequency of work at heights compared to the conventional art, and improve safety, and a jig applicable to the disassembly method. It is another object of the present invention to provide a cutting device.

  In order to achieve the above object, the transformer disassembly method according to the present invention disassembles the transformer body after discharging and treating the PCB when the insulating oil or the insulating oil contains the PCB and removing the exterior parts. The method is characterized in that a casing and an internal element constituting the transformer main body are bound via a jig, and the casing and the internal element are cut and conveyed as an integrated body.

  In the transformer disassembly method having the above-described characteristics, the internal element may be an upper yoke and an iron core, or the iron core alone. By having such a feature, the transformer body can be cut without dividing the silicon steel plate constituting the iron core.

  Further, in the transformer disassembly method according to the present invention for achieving the above object, when the insulating oil or the insulating oil contains PCB, the transformer body after discharging and treating the PCB and removing the exterior parts is used. A disassembly method, comprising: a casing upper cutting step of cutting and removing an upper part of a casing constituting the transformer main body to open an internal element; and forming the casing and the transformer main body after the casing upper cutting step. An upper yoke and an iron core, which are internal elements, are bound via a jig, and a coil upper cutting step of cutting and removing as an integral body, and after the coil upper cutting step, the casing and the iron core are bound via the jig. And a step of cutting and removing the coil middle part as an integral body.

  In the transformer disassembly method having the above-described characteristics, it is preferable that a coil extracting step of extracting a coil from the iron core is provided between the coil upper section cutting step and the coil middle section cutting step. By having such a feature, the transformer main body can be cut while avoiding a cheap coil in which the saw blade is caught.

  Further, in the transformer disassembly method having the above-described features, it is preferable that the step of cutting the middle portion of the coil is repeated a plurality of times while shifting the cutting position to a lower portion. By having such a feature, the cutting can be executed after setting the weight of the cutting portion to the range of the weight that can be suspended by a crane or the like.

  Further, in the transformer disassembly method having the above-described characteristics, it is preferable to include a step of disposing a sheet pile between adjacently disposed iron cores after the coil extracting step. By having such characteristics, even when there are a plurality of iron cores, it is possible to restrain each of the plurality of iron cores from four directions.

  Further, the transformer disassembly jig applicable to the implementation of the above method includes, among the elements constituting the transformer main body, a gripping means for gripping the side plate of the casing, and an upper yoke and an iron core, or an iron core alone based on the gripping means. And a clamping means for clamping.

  Further, in the jig for transformer disassembly having the features as described above, the gripping means includes at least a long side plate grip portion for gripping a longitudinal portion of the side plate of the casing, and a short side direction of the side plate of the casing. It is good to have composition divided into a short side board grasping part which grasps a part. According to this feature, even when the sizes of the casings constituting the transformer main body are different, the holding means can be shared.

  Further, among the transformer disassembly jigs having the above characteristics, it is preferable that a support plate for supporting the holding means is provided on an inner wall of the holding means. According to this feature, the holding means can be easily installed and held.

  In addition, a transformer disassembling cutting apparatus applicable to the above-described method is configured to disassemble the transformer main body after discharging and treating the PCB when the insulating oil or the insulating oil contains the PCB and removing the exterior parts. A pair of pedestals arranged on both sides of the transformer main body along a cutting direction of the transformer main body, and a drive movable along one of the pedestals of the pair of pedestals. A unit, a driven unit movable along the other frame, and an endless saw blade bridged between the drive unit and the driven unit and rotated by the drive unit. And

  Further, in the transformer disassembly cutting device having the above-described features, it is preferable that the gantry includes a height adjusting mechanism. According to this feature, the transformer main body can be cut stepwise in the horizontal direction.

  Furthermore, the transformer disassembling cutting device having the above-described features may be configured to include a horizontal feed mechanism that moves the drive unit and the driven unit along the gantry. According to such a configuration, the moving speed at the time of moving the drive unit and the driven unit can be constant regardless of the cutting resistance.

  According to the transformer disassembly method having the above-described features, since the external element and the internal element constituting the transformer can be cut at a time, the labor of the operator can be significantly reduced as compared with the related art. Further, since the height of the transformer body is reduced every time the cutting operation is performed, the frequency of operations at high places is reduced, and safety can be improved.

It is a top view showing the state where the jig was attached to the transformer main body for disassembly. FIG. 2 is an enlarged cross-sectional view taken along the line AA in FIG. 1. It is a top view showing the state where a jig was attached to a transformer main part after cutting an upper yoke and removing a coil. It is a figure showing the front composition of a cutting device seen from the transversal direction of a transformer main part. It is a figure showing the side composition of the cutting device seen from the longitudinal direction of the transformer main part. It is a flow figure for explaining the flow of the transformer disassembly method concerning an embodiment. It is a figure showing signs that an upper part of a casing in a transformer main part was cut. It is a figure showing the state where the jig was attached to the transformer main part where the upper part of the casing was cut.

  Hereinafter, embodiments of a transformer disassembly method, a transformer disassembly jig, and a transformer disassembly cutting device of the present invention will be described in detail with reference to the drawings. The embodiment described below is a part of a preferred embodiment for carrying out the present invention, and as long as the effects of the invention are exerted, even if the part is changed, the embodiment of the present invention will be described. Department can be considered.

[Overview of transformers to be dismantled]
Also, as shown in FIGS. 1 to 5, the transformer to be dismantled in the present embodiment discharges and processes the PCB when the insulating oil or the insulating oil PCB is contained in the casing 12, and the heat radiation (not shown) The transformer body 10 is obtained by removing exterior parts such as a board, a conservator, and a soundproofing board. The transformer body 10 mainly includes a casing 12, an iron core 14, a yoke (upper yoke 14a in the embodiment), and a coil 16, and has an internal frame and the like.

[Configuration of jig]
First, a transformer disassembly jig (hereinafter, simply referred to as a jig 20) for carrying out the transformer disassembly method of the present invention will be described with reference to FIGS. In the drawings, FIG. 1 is a plan view showing a state in which a jig is mounted on a transformer body to be disassembled, and FIG. 2 is an enlarged cross-sectional view taken along the line AA in FIG. FIG. 3 is a plan view showing a state where the jig is mounted on the transformer main body after the upper yoke has been cut and the coil has been removed.

  The jig 20 according to the present embodiment is mainly configured with a holding unit 22 and a holding unit 28. The holding means 22 is an element for holding the side plate of the casing 12 constituting the transformer main body 10. In the present embodiment, a pair of long side plate grips 24 and a pair of short side plate grips 26 are provided. As shown in the cross-sectional configuration of FIG. 2, the long side plate holding portion 24 and the short side plate holding portion 26 have an inverted U-shape in which inner side walls 24a, 26a and outer side walls 24b, 26b are connected by bridge portions 24c, 26c ( (U-shaped). Further, support plates 24d and 26d are provided at lower ends of the inner side walls 24a and 26a, and fixing means 24e and 26e (for example, fastening bolts) for performing a gripping function are provided on the outer side walls 24b and 26b. ing. Further, in the present embodiment, the bridge portions 24c and 26c are provided with hanging hooks 24f and 26f corresponding to lifting by a crane or the like at a plurality of locations.

  The gripping means 22 having such a configuration is used by interposing a side plate of the casing 12 between the inner side walls 24a, 26a and the outer side walls 24b, 26b. Specifically, after the side plate is interposed between the inner side walls 24a, 26a and the outer side walls 24b, 26b, the side plate is gripped by pressing the side plate against the inner side walls 24a, 26a by the fixing means 24e, 26e. Thereby, the holding of the side plate by the holding means 22 is completed.

  The support plates 24d and 26d provided at the lower ends of the inner side walls 24a and 26a are elements for arranging a holding means 28 described in detail later. Therefore, when the holding means 28 is fixed to the gripping means 22, it is not necessary to provide the holding means. In addition, naturally, the arrangement position is not limited to the lower end of the inner wall, and may be arbitrarily changed according to the arrangement position and form of the holding means 28.

  Although the holding means 22 can be formed into a frame shape in plan view, it can be applied to the casing 12 of various sizes by dividing the holding means 22 into a long side plate holding portion 24 and a short side plate holding portion 26. Becomes Needless to say, the long side plate holding portion 24 and the short side plate holding portion 26 may be further subdivided. For example, by arranging a plurality of short side plate holding portions 26 in the embodiment in series, the long side plate holding portion 24 can also be configured.

  Starting from the gripping means 22 (the long side plate gripping portion 24 and the short side plate gripping portion 26) disposed opposite to each other, the sandwiching means 28 can firmly sandwich a structure located therebetween, for example, the upper yoke 14a or the iron core 14. If possible, the specific configuration is not asked. As an example of the holding means 28, a jack as shown in FIGS. 1 to 3 can be mentioned. The jack may be manually operated or operated using electric power, hydraulic pressure, or the like as power.

  The holding means 28 is supported between the inner walls 24a, 26a and the internal structure (the upper yoke 14a and the iron core 14) while being supported by the support plates 24d, 26d provided on the inner walls 24a, 26a of the gripping means 22. By applying the force in the tension direction, it is possible to facilitate installation and stabilize the sandwiching state.

[Configuration of cutting device]
Next, the configuration of a transformer disassembly cutting device (hereinafter, simply referred to as a cutting device 30) used in the embodiment will be described with reference to FIGS. In the drawings, FIG. 4 is a diagram showing a front configuration of the cutting device as viewed from a short direction of the transformer body, and FIG. 5 is a diagram showing a side configuration of the cutting device as viewed from a longitudinal direction of the transformer body. . Further, the cutting device 30 described below is merely an example of a cutting device that can be applied when performing the transformer disassembly method according to the present invention. That is, the means for cutting the transformer main body 10 is not limited in performing the transformer disassembly method described later.

  The cutting device 30 according to the present embodiment is a band saw based on a gantry 32, a drive unit 34, a driven unit 36, and an endless saw blade 38. The gantry 32 is arranged so as to form a pair along the side plate of the transformer body 10 to be dismantled. In the example shown in FIGS. 4 and 5, the transformer is arranged along the side plate in the longitudinal direction of the transformer main body 10.

  A track 32a such as a rail is provided at the upper end of the gantry 32, and a drive unit 34 and a driven unit 36, which will be described in detail later, can be stably moved. The gantry 32 according to the embodiment includes a height adjustment mechanism 32b. With such a configuration, it is possible to change the height of the endless saw blade 38 according to the cutting position of the transformer body 10. The specific configuration of the height adjusting mechanism 32b does not matter in detail as long as the height of the track 32a can be changed. That is, not only a jack such as a jack shown in FIG. 4 whose height can be adjusted steplessly, but also a simple structural rearrangement such as rearrangement of support frames having different lengths depending on the application may be used.

  Further, a scaffold (not shown) along the track 32a may be arranged on the side of the gantry 32 in the cutting device 30. With such a configuration, the operator can visually check the state of the endless saw blade 38 at the time of cutting.

  The drive unit 34 is a unit for rotating an endless saw blade 38 wound around the driven unit 36 along its orbit. The drive unit 34 basically includes a frame 34a, a drive pulley 34b, a driven pulley 34c, and a tension adjusting pulley 34d. The frame 34a is an element for arranging the driving pulley 34b, the driven pulley 34c, and the tension adjusting pulley 34d at predetermined positions. The lower end has a movement for moving on a track 32a provided on the gantry 32. Means 34e are provided. The moving means 34e may be, for example, a roller or the like.

  The drive pulley 34b is an element for rotating the endless saw blade 38, and is provided with a motor 34b1 directly or via a transmission gear. The driven pulley 34c plays a role as a guide for guiding the endless saw blade 38 rotating via the drive pulley 34b on a revolving orbit. The tension adjusting pulley 34d plays a role of adjusting the tension of the endless saw blade 38 wound around the orbit. In the case of this embodiment, the tension adjusting pulley 34d is disposed between the driving pulley 34b and the driven pulley 34c, and the tension adjusting pulley 34d is pressed against the endless saw blade 38 so as to curve the endless saw blade 38 passing therebetween. Excessive bending that has occurred on the saw blade 38 can be suppressed, and the cutting action can be stabilized.

  The driven unit 36 is a unit that is bridged between the driving unit 34 and plays a role of forming a revolving trajectory of the endless saw blade 38 rotated by the driving unit 34. The driven unit 36 basically includes a frame 36a, a pair of driven pulleys 36b and 36c, and a tension adjusting pulley 36d. The frame 36a is an element for arranging a pair of driven pulleys 36b and 36c and a tension adjusting pulley 36d at predetermined positions, similarly to the drive unit 34 described above. In addition, a moving means 36e for moving on a track 32a provided on the gantry 32 is provided at the lower end.

  The driven pulleys 36b and 36c guide the endless saw blade 38, which rotates through the driving pulley 34b provided on the drive unit 34, on the orbit, similarly to the driven pulley 34c provided on the drive unit 34. Take a role as a guide. The tension adjusting pulley 36d has a role of adjusting the tension of the endless saw blade 38 wound around the orbit. In the case of the present embodiment, the tension adjusting pulley 36d is disposed between the pair of driven pulleys 36b and 36c, and the tension adjusting pulley 36d is pressed against the endless saw blade 38 so as to curve the endless saw blade 38 passing therebetween. Excessive bending that has occurred on the blade 38 can be suppressed, and the cutting action can be stabilized.

  Further, in the cutting device 30 according to the embodiment, the drive unit 34 is disposed on one of the gantry 32 disposed at the opposing position via the transformer main body 10, and the driven unit 36 is disposed on the other. It is configured such that an element located between the drive unit 34 and the driven unit 36 can be cut.

  Between the drive unit 34 and the driven unit 36 constituting the cutting device 30, a beam portion 42 for connecting the respective frames 34a, 36a is provided. The beam portion 42 is disposed at least above the orbit defined by the endless saw blade 38. By providing the beam portion 42, the drive unit 34 and the driven unit 36 fall down in the approaching direction due to the resistance applied when the transformer body 10 is cut by the endless saw blade 38 and the pulling force accompanying the rotation of the endless saw blade 38. Can be prevented. Further, since the positional relationship between the drive unit 34 and the driven unit 36 can be stabilized, it is possible to prevent the endless saw blade 38 from being twisted.

  The endless saw blade 38 is an element for cutting the transformer body 10. The endless saw blade 38 is formed of a flexible thin band-shaped blade capable of rotating on a trajectory defined by the drive unit 34 and the driven unit 36. By connecting both ends of the band-shaped saw blade in an annular shape, the endless saw blade 38 can be cut by rotation.

  Further, the cutting device 30 according to the embodiment has a horizontal feed mechanism 40 between the gantry 32, the drive unit 34, and the driven unit 36. The horizontal feed mechanism 40 is an element for moving the drive unit 34 and the driven unit 36 along a track 32 a provided on the gantry 32. As the configuration, for example, a ball screw arranged along the track 32a, a slider movable along the ball screw, a motor for rotating the ball screw, and the like may be used. When the horizontal feed mechanism 40 has such a configuration, the ball screw and the motor may be arranged on the gantry 32, and the slider may be arranged on the drive unit 34 and the driven unit 36. With such an arrangement, the drive unit 34 and the driven unit 36 can be moved along the track 32a by rotating the ball screw by the motor.

  The movement of the drive unit 34 and the driven unit 36 does not need to be automated with power and may be manually moved. However, by providing and automating the horizontal feed mechanism 40 as in the present embodiment, the drive unit 34 and the driven unit 36 can be moved at a constant speed. Thus, a change in the feeding speed due to the amount of the cutting resistance does not occur, and the movement while cutting can be stabilized.

  According to the cutting device 30 having such a configuration, the transformer main body 10 is moved by moving the drive unit 34 and the driven unit 36 along the track 32 a provided on the gantry 32 while rotating the endless saw blade 38. It becomes possible to cut horizontally. Further, in the cutting device 30 according to the present embodiment, the gantry 32, the drive unit 34, and the driven unit 36 are configured separately. Accordingly, when the apparatus requires curing or the like, the drive unit 34 and the driven unit 36 can be operated after at least the gantry 32 is completely cured. Therefore, the contamination range of the device can be reduced. In addition, as a matter of course, the subdivision of the components makes it easy to carry in / out the device, assemble and disassemble the device.

[Dismantling method]
Hereinafter, the transformer disassembly method according to the present embodiment will be described with reference to the flowchart shown in FIG. Note that, as described above, the transformer disassembly method according to the present embodiment is described for the transformer main body 10 in a state where the PCB inside the casing 12 is removed and exterior components such as a heat sink, a conservator, and a soundproof plate are removed. I do.

  First, the cutting device 30 is loaded and assembled. In assembling the cutting device 30, first, the gantry 32 is arranged along the longitudinal direction of the transformer body 10 to be dismantled. Next, the drive unit 34 and the driven unit 36 are installed on the track 32a provided on the upper part of the gantry 32, and the beam part 42 is arranged between both units. Thereafter, the endless saw blade 38 is wrapped around the drive pulley 34b and the driven pulley 34c provided in the drive unit 34 and the driven pulleys 36b and 36c provided in the driven unit 36, and the endless saw blade is set by the tension adjusting pulleys 34d and 36d. The tension of 38 is adjusted (S010).

[Case top cutting process]
Next, the height of the gantry 32 is adjusted so that the cutting position by the endless saw blade 38 is located at the upper portion 12a of the casing 12 (see FIG. 7). Then, with the drive unit 34 driven and the endless saw blade 38 rotated, the drive unit 34 and the driven unit 36 are moved along the track 32 a of the gantry 32 to cut the upper portion 12 a of the casing 12. . Here, the upper portion 12a of the casing 12, which is to be a cutting portion, is preferably suspended in advance by a lifting tool such as a crane (S020).

  The cut upper portion 12a of the casing 12 is moved by a crane or the like as shown in FIG. 7 (S030), and is separately cut and packed into a storage box or the like (S031). The upper part 12a of the casing 12 after packing is moved to a predetermined storage place (S032).

[Coil upper cutting process]
After the upper part of the casing 12 constituting the transformer main body 10 is opened, the jig 20 is lifted by a crane or the like, and is disposed on the upper part of the transformer main body 10 as shown in FIG. The jig 20 arranges and fixes the long side plate holding portion 24 and the short side plate holding portion 26 constituting the holding means 22 to the long side portion and the short side portion of the side plate forming the casing 12, respectively. I do. The holding means 28 is arranged on the inner wall 24a, 26a side of the gripping means 22, and generates a force between the upper yoke 14a and the inner wall 24a, 26a in a direction of separating them. At this time, opening stoppers 44 for preventing the casing 12 from expanding due to the use of the holding means 28 are arranged between the long side plate grips 24 and the short side plate grips 26 which are arranged to face each other. . Starting from the long side plate grips 24 arranged to form a pair and the short side plate grips 26 similarly arranged to form a pair, the force of the holding means 28 is applied to the upper yoke 14a existing therebetween. , The upper yoke 14a and the iron core 14 arranged inside the upper yoke 14a are clamped. As a result, the casing 12, the upper yoke 14a, and the iron core 14 are bound, and can be handled as an integral body (S040).

  After the jig 20 is mounted on the transformer main body 10, the hanging tool (for example, the balance 50 as shown in FIG. 8 and the wire attached thereto) that has hung the jig 20 is released, and the endless saw blade in the cutting device 30 is released. 38 is performed. The positioning of the endless saw blade 38 is performed by lowering the drive unit 34 and the driven unit 36 by the height adjustment mechanism 32b of the gantry 32 (S050).

  After the positioning of the endless saw blade 38, the drive unit 34 and the driven unit 36 are moved along the trajectory of the gantry 32 while the endless saw blade 38 is rotated. Thereby, the casing 12, the upper yoke 14a, and the iron core 14 can be cut in the horizontal direction at once or stepwise (including repeating cutting and stopping, cutting preparation, and the like). Here, when the load applied to the driving of the endless saw blade 38 increases due to the weight applied to the cutting portion, the endless saw blade 38 is rotated by driving a not-shown wedge or the like into the cutting portion to expand the cutting portion. It is desirable to reduce the load at that time (S060).

  Next, the jig 20 holding the cutting portion is lifted by a crane or the like, and the casing 12, the upper yoke 14a, and the iron core 14 corresponding to the cutting portion are moved. Since the casing 12, the upper yoke 14a, and the iron core 14 can be handled as an integral body by the gripping means 22 and the holding means 28, the movement of the cut portion is facilitated (S070). The binding of the casing 12, the upper yoke 14 a, and the iron core 14, which have been moved as a unit, is released by the jig 20, whereby the silicon steel plate forming the upper yoke 14 a and the iron core 14 is disassembled. The casing 12 is shredded and packed in a storage box or the like (S071). The boxed upper yoke 14a, iron core 14, and casing 12 are moved to a predetermined storage location (S072).

[Coil removal process]
After the upper yoke 14a is removed, the coil 16 is removed from the iron core 14. When there are a plurality of coils 16, the extraction of the coils 16 may be performed individually (S080). The coil 16 extracted from the iron core 14 is moved (S090), cut into pieces, and packed in a storage box or the like (S091). The coil 16 after packing is moved to a predetermined storage place (S092).

[Coil middle section cutting process]
After extracting the coil 16 from the iron core 14, the jig 20 is lifted by a crane or the like, and placed and fixed on the upper part of the transformer main body 12. The fixing of the jig 20 is the same as that of S040 described above, but the object to be clamped by the clamping means 28 is the iron core 14. Here, when there are a plurality of iron cores 14, a sheet pile 52 may be driven between the iron cores 14 arranged adjacent to each other as shown in FIG. The iron core 14 is configured by stacking a plurality of thin silicon steel plates. By restraining the iron cores 14 from four directions by the sheet pile 52 and the holding means 28, it is possible to prevent a situation in which the silicon steel sheet is cut off at the time of cutting and the cutting resistance of the endless saw blade 38 is improved. In addition, it is possible to prevent the iron core 14 from falling down (S100).

  Next, the hanging tool that has hung the jig 20 is released, and the endless saw blade 38 in the cutting device 30 is positioned. The positioning of the endless saw blade 38 is performed by lowering the drive unit 34 and the driven unit 36 by the height adjustment mechanism 32b of the gantry 32. The position of the endless saw blade 38 is determined so that the casing 12 and the iron core 14, which can be handled as one piece through the jig 20, have a thickness that can be lifted by a crane or the like after cutting. For example, the cutting may be performed at a broken line portion shown in FIG. 8 (S110).

  After the positioning of the endless saw blade 38, the drive unit 34 and the driven unit 36 are moved along the track 32a of the gantry 32 while the endless saw blade 38 is rotated. Thereby, the casing 12 and the iron core 14 can be cut horizontally or stepwise. Here, when the load applied to the driving of the endless saw blade 38 increases due to the weight applied to the cut portion, it is preferable to widen the cut portion by driving a wedge or the like into the cut portion as described above (S120).

  After the cutting is completed, the casing 12 and a part of the iron core 14 cut together with the jig 20 are lifted and moved (S130). The iron core of the casing 12 and the iron core 14 moved together with the jig 20 is released from the binding by the jig 20, whereby the silicon steel plate constituting the iron core 14 is disassembled. Further, the casing 12 is shredded and packed in a storage box or the like (S131). The iron core 14 and the casing 12 after packing are moved to a predetermined storage location (S132).

  Here, the cutting of the casing 12 and the iron core 14 from S100 to S132 is repeated until the lower elements (the lower part of the iron core 14 and the lower part of the casing 12) have a weight that can be lifted by a crane or the like. In the example of FIG. 8, the repetition is performed for the number of cut portions indicated by the broken lines (S140).

  After the weight of the lower element becomes a weight that can be lifted by a crane or the like, the anchor bolt (not shown) fixing the lower element to the base 18 is removed (S150). After the removal of the anchor bolts, the lower element composed of the lower part of the iron core 14 and the lower part of the casing 12 is lifted and moved (S160). The iron core 14 of the moved lower element is disassembled into a silicon steel plate, and the casing 12 is shredded and packed in a storage box or the like (S161). The iron core 14 and the casing 12 after packing are moved to a predetermined storage location (S162).

  After the disassembly of the transformer body 10 is completed, the cutting device 30 is disassembled and moved (S170). When disassembling the transformer main body 10, when contaminants such as PCBs are present, the carrying-out process differs depending on the presence or absence of the contamination. For example, in the case of an element such as the gantry 32, for which it is clear that no contaminant is attached by curing, the curing is removed and carried out after decontamination (S171). On the other hand, the endless saw blade 38, and the drive unit 34 and the driven unit 36 with which the endless saw blade 38 is in contact are disassembled and cut, and then packed in a storage box or the like (S172). The contaminated elements of the cutting device 30 after the box packing are moved to a predetermined storage location (S173).

  According to the transformer disassembly method as described above, the components constituting the transformer main body 10 are cut horizontally or stepwise by a power device, and this process is repeated a plurality of times in the height direction to cut the entire transformer. It is possible to do. Therefore, the labor of the operator can be greatly reduced as compared with the conventional transformer disassembly method in which the components are disassembled or cut for each component.

  Moreover, in the disassembly method in which the transformer main body 10 is cut in the vertical direction to disassemble each component as in the related art, it is necessary for the operator to climb to the upper part of the transformer main body 10 every time the cutting or lifting is performed. On the other hand, in the transformer disassembly method according to the present invention, the transformer body 10 is cut in the horizontal direction. For this reason, the frequency of the work at a high place by the worker is reduced as the work proceeds, and safety can be improved.

  In the above embodiment, it has been described that the transformer main body 10 is cut using a band saw having the endless saw blade 38 as the cutting device 30. However, the transformer disassembly method according to the present invention does not ask about the configuration of the cutting device 30. That is, if it is possible to cut the casing 12 constituting the transformer main body 10 and the upper yoke 14a and the iron core 14 arranged inside the casing 12, a cutting device having a reciprocating saw blade or a tip saw can be used. A cutting device provided with a circular saw blade may be used. This is because the effect of the transformer disassembly method according to the present invention can be obtained using any of the cutting devices. Of course, when the labor required for the cutting is not limited, the present invention is not limited to a device having power, and can be regarded as a part of the present invention even if the cutting is performed by human power or the like.

10 Transformer body, 12 Casing, 12a Upper part, 14 Iron core, 14a Upper yoke, 16 Coil, 18 Base, 20 Jig , 22 ... gripping means, 24 ... longitudinal side plate gripping part, 24a ... inner wall, 24b ... outer wall, 24c ... bridge part, 24d ... support plate, 24e ... fixed Means, 24f… hanging hook, 26… short side plate grip, 26a… inner wall, 26b… outside wall, 26c… bridge part, 26d… support plate, 26e… ... fixing means, 26f ... hanging hook, 28 ... clamping means, 30 ... cutting device, 32 ... stand, 32a ... track, 32b ... height adjustment mechanism, 34 ... Drive unit, 34a Frame, 34b Drive pulley, 34b1 …………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… 0 Driven pulley, 36d Tension adjustment pulley, 36e Moving means, 38 Endless saw blade, 40 Horizontal feed mechanism, 42 Beam part, 44 Open stop, 50 ... balance, 52 ... sheet pile.

Claims (12)

When PCB is contained in the insulating oil or the insulating oil, the PCB is discharged and treated, and the transformer body after dismantling the exterior parts is disassembled,
Binding the casing and the internal element constituting the transformer body via a jig,
A transformer disassembly method, wherein the casing and the internal element are cut and transported as a single unit.   The transformer disassembly method according to claim 1, wherein the internal element is an upper yoke and an iron core, or the iron core alone. When PCB is contained in the insulating oil or the insulating oil, the PCB is discharged and treated, and the transformer body after dismantling the exterior parts is disassembled,
Cutting the upper part of the casing constituting the transformer main body, removing the casing upper part cutting step of removing and removing the internal element,
After the casing upper cutting step, an upper yoke and an iron core, which are internal elements constituting the casing and the transformer main body, are bound through a jig, and cut as an integral unit, and a coil upper cutting step of removing,
After the coil upper cutting step, the casing and the iron core are tied together via the jig, and cut as a single piece, a coil middle section cutting step of removing,
Trans dismantling method characterized by having.   The transformer disassembly method according to claim 3, further comprising a coil extracting step of extracting a coil from the iron core between the coil upper cutting step and the coil middle cutting step.   The transformer disassembly method according to claim 3, wherein the step of cutting the middle portion of the coil is repeated a plurality of times while shifting a cutting position to a lower portion.   6. The transformer disassembly method according to claim 4, further comprising a step of disposing a sheet pile between adjacently disposed iron cores after the coil extracting step. Of the elements that make up the transformer body,
Gripping means for gripping the side plate of the casing,
A transformer disassembly jig, comprising: an upper yoke and an iron core or a holding means for holding the iron core alone with the gripping means as a base point. The gripping means is at least
Of the side plates of the casing, a longitudinal side plate gripper for gripping a longitudinal portion,
Of the side plates of the casing, a short side plate grip portion that grips a short direction portion,
The jig for transformer disassembly according to claim 7, wherein the jig is divided into two pieces.   9. The transformer disassembly jig according to claim 7, wherein a support plate for supporting the holding means is provided on an inner side wall of the gripping means. 10. When the insulating oil or the insulating oil contains a PCB, the cutting device is configured to discharge and treat the PCB and dismantle the transformer body after removing the exterior parts,
On both sides of the transformer body, a pair of gantry arranged along the cutting direction of the transformer body,
Of the pair of gantry,
A drive unit movable along one of the frames,
A driven unit movable along the other frame,
An endless saw blade bridged between the driving unit and the driven unit and rotated by the driving unit, the cutting device for transformer dismantling.   The cutting device for transformer disassembly according to claim 10, wherein the gantry includes a height adjustment mechanism.   The cutting device for transformer disassembly according to claim 10 or 11, further comprising a horizontal feed mechanism that moves the drive unit and the driven unit along the gantry.

Images