JP2006191156A - Scrapping method of core segment cut and dismounted from transformer and device thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable dismounting a transformer core and collection of a PCB oil contained in the transformer core, ideally, with regard to a dismounting method and a dismounting device of a transformer core. <P>SOLUTION: A core 10 to be dismounted is mounted on a receiving piece 14, and a mandrel 18 is inserted to its central hole 10A. A press cutting blade 20 fitted to the width of a thin plate constituting the core 10 is pressurized toward the core 10 from the outer diameter side thereof, and the core 10 is cut by the press cutting blade 20 one by one from an outer layer. Since a core segment after being cut and divided is subjected to scrapping such as repeated bending, slippage occurs between thin plate segments constituting a winding layer, and adhesion between winding layers is released and separated to individual thin plate segments. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method and apparatus for scattering a core piece cut and disassembled from a transformer, and is particularly suitable for dismantling processing of an iron core such as a pole transformer containing PCB oil.

The dismantling of the transformer core requires complete removal of the PCB oil contained between the winding layers. Conventionally, squeezing and deoiling have been attempted by repeatedly applying pressure to the hollow iron core after the winding has been removed with a press or the like. However, in the conventional method, the restraint between the winding layers can be slightly relaxed, and the penetration of the cleaning liquid to the center and the vaporization of the heated vaporization cannot be sufficiently performed, and it is difficult to completely clean the PCB oil. . Furthermore, PCBs were extremely difficult to remove when the iron core was partially spot-welded between the windings, or when the iron core side wall was solid and solidified with varnish. Conventionally, the dismantling work has been mainly manual work using a hammer or bar, and the efficiency has not been very good. There was also the risk of PCB contamination.
JP 2000-350981 A JP 2000-82617 A

  The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to ideally perform the dismantling of the iron core of the transformer and the recovery of the PCB oil contained therein.

  According to the method of the present invention, in a method of scattering an iron core or a core piece disassembled from a transformer, a force is applied to a part of the iron core or a core piece so that the cores or the core pieces are mutually wound between winding layers. There is provided a method for spreading an iron core, characterized in that the iron core or the iron core piece is separated into individual thin plates by causing a gap between the winding layers. According to the apparatus of the present invention, the iron core or core piece disassembled from the transformer includes a means for holding the core or core section and a means for applying a force to a part of the core or core section. In addition, the force applied to a part of the core or the core section causes a shift between the winding layers constituting the core or the core section, and the core or the core section is separated into individual thin plates by the shift between the winding layers. An iron core scattering device is provided. When bending or sliding is applied to the core or core section, localized uneven force is applied to the core or core section, causing displacement between winding layers, thereby separating the core winding layers that are in close contact with each other. It is possible to expect complete cleaning of the insulating oil that may be present.

  More specifically, according to the first aspect of the present invention, in the method of scattering the core section cut and disassembled from the transformer, the core section gripped from both sides at the center is reciprocated, By causing the core section being reciprocated to contact with the baffle pins fixedly installed on both sides at the non-gripping part and bending the core section to bend, the mutual displacement between the laminated plates constituting the core section is caused. There is provided a scraping method characterized in that the core section is separated into individual thin plates by displacement between the plates.

  According to the second aspect of the present invention, in the method of scattering the core section cut and disassembled from the transformer, the core section is passed between the roller pairs so as to come into contact with the rollers constituting the roller pair on the opposing surface, The surface speed of the rollers rotating in opposite directions constituting the roller pair is appropriately changed to cause a mutual shift between the laminated plates in contact with the rollers, and the core section is separated into individual thin plates by the deviation between the laminated plates. A scattering method is provided.

  According to the invention described in claim 3, the transformer core is an apparatus for scattering individual thin plates after being divided into strip-shaped sections, and the core is sandwiched and held from both sides in the stacking direction. It is provided with means for reciprocating the section in a linear direction and baffle pins provided on both sides of the path of reciprocating motion of the core section and abutting the moving core section at a non-gripping part and allowing the section to bend and pass. An iron core scattering device is provided.

  According to invention of Claim 4, it is an apparatus for scattering each thin plate after dividing | segmenting a transformer core into a strip-shaped piece, It is opposingly arranged on both sides of the core piece after a cutting | disconnection division | segmentation, An iron core scattering apparatus comprising: a plurality of pairs of rollers in contact with the surface of the core section to be rotated; and a rotation driving means for rotating the respective pairs of rollers in opposite directions and at different surface speeds. Provided.

  The operation and effect of the invention of the present invention will be described. The core section is displaced between the layers by changing the surface speed of the core section by bending the core section back and forth, or by pressing and moving the core section with a roller. A force is generated, which allows the iron core to be separated into individual sheets. That is, by applying bending or sliding to the iron core or core section, a localized uneven force is applied to the iron core or core section, causing displacement between winding layers, thereby separating the core winding layers that are in close contact with each other. Insulating oil that may exist in the gaps can be completely cleaned.

  1 and 2 show a conceptual configuration of a cutting device according to a first embodiment of the present invention. The transformer has an inner iron type in which coils are wound on both sides of one iron core, an outer iron type in which one coil is wound across two iron cores, and a single coil straddling four cross-shaped iron cores. Although there are various variations such as a cross shape wound around, the present invention can be used in any type of transformer. And the iron core 10 removes a coil from these transformers. Regarding the method and apparatus for removing the winding from the iron core 10, refer to the description of JP-A-2000-82617 filed by the same applicant as this application if necessary. As for the core winding method, (a) an endless type wound endlessly from a long hoop material, and (b) a rectangular thin plate with a slightly different length according to the inner / outer diameter difference is curled and overlapped only at the end This is an end polymerization type in which the overlapping portions are slightly wound and overlapped, (c) a composite type in which the inner diameter side is configured as an endless type, and the outer diameter side is configured as an end polymerization type, (d) C-shaped There is a C-shaped matching mold in which two cores are formed by combining two end surfaces that are machined and formed into one iron core. In addition, the cross-sectional shape of the iron core is as follows: (a) a rectangular shape in which the side wall of the iron core is flush with the inner and outer diameter sides and the cross section is a rectangle; (C) an outer diameter step type in which a step is formed so that the width is reduced on the outer diameter side, and (d) an inner and outer diameter step type in which a step is formed so that the width is reduced on both the inner diameter side and the outer diameter side. . In the apparatus of the first embodiment, as shown in FIG. 2, an outer diameter step type cross section in which the side surface has a step on the outer diameter side as shown in FIG. Although the present invention is intended for a shape, this invention uses any of the lap winding methods from (a) to (d) and any cross-sectional shape from (a) to (d). be able to. Moreover, as shown in FIG. 2, the iron core 10 is shown as having a band 11 for width tightening on the outermost periphery.

  In FIG. 2, reference numeral 12 denotes a seat plate. A receiving piece 14 is provided on the seat plate 12, and the iron core 10 is placed on the receiving piece 14. The seat plate 12 is provided on the turning table 16, and by rotating the turning table 16 as indicated by an arrow a, the iron core 10 can be rotated and set at a desired angular position. A mandrel 18 is provided above the iron core 10. The mandrel 18 is connected to a hydraulic cylinder mechanism (not shown), and the mandrel 18 is normally retracted upward (in the direction of arrow b) as shown in the right half of FIG. However, when the iron core 10 is cut, the mandrel 18 is driven in the direction of the arrow c as shown in the left half of FIG. 2 by driving the hydraulic cylinder mechanism, and the mandrel 18 is introduced into the central opening 10A of the iron core 10. The lower end 18-1 reaches the central opening 14A of the receiving piece 14, and the core 10 being cut can be held by inserting the mandrel 18.

  In the illustrated embodiment, a pair of press cutting blades 20 are provided at opposite diameter positions, and the press cutting blade 20 has a width corresponding to the width of the iron core 10 (in the case of a stepped iron core, a width that covers the widest part of the iron core). The cutting edge 20-1 at the tip is opposed to the peripheral surface of the iron core 10. The cutting blade 20 is connected to the piston rod 22 of each hydraulic cylinder mechanism, and is normally retracted in the direction of the arrow d as shown in the lower half of FIG. 1, and the cutting blade 20 is separated from the iron core 10, but is cut. At this time, the push blade 20 is advanced in the direction of arrow e by the piston rod 22, and the iron core 10 is sequentially cut from the outer layer. In the final phase of cutting, the core 18 receives the push cutting blade 20 to suppress the deformation of the iron core 10 and can cut the iron core 10 until it reaches its innermost circumference.

  The iron core 10 is divided into two by a single cutting operation by the pressing blade 20 positioned opposite to the diameter. Then, the turning table 16 rotates at an appropriate angle, and the cutting position by the push blade 20 can be adjusted. Such adjustment of the cutting position is also important in order to avoid the difference in length between the strip-shaped sections after cutting in the case of the laminated iron core. That is, the angular position of the iron core can be adjusted by the turning table 16 so that the cutting position is separated from the overlapping portion by an appropriate distance. By such a cutting operation, the section from which the core is cut becomes too short, and there is no problem that the grip of the core section is troubled when the interstitial layer is scattered in a later process.

  In FIG. 1, a pair of push cutting blades 20 can be provided like a pair of imaginary lines. In this case, the iron core 10 can be divided into four by one cutting operation.

  3 and 4 show a cutting device according to a second embodiment of the present invention. In this embodiment, a mandrel-pushing blade assembly 30 fixed at the upper side and a table assembly 32 which can be moved up and down at the lower side are shown. Consists of The mandrel-push blade assembly 30 includes a mandrel 118 and a push blade 120. As shown in FIG. 3, eight cutting blades 120 are arranged around the mandrel 118, and each pressing blade 120 is connected to the piston rod 122. The piston rod 122 extends from the cylinder 124. The cylinder 124 is held between upper and lower octagonal support plates 126, 128, and the mandrel 118 protrudes from the upper support plate 128 toward the table assembly 32 through the opening 126 A of the lower support plate 126. In the table assembly 32, the table 116 is connected to a piston 142 extending from the cylinder 140. Therefore, the table assembly 32 can be moved up and down with respect to the mandrel-push blade assembly 30 as shown by an arrow f. The seat plate 112 is rotatably supported with respect to the table 116 by pins 144, and the seat plate 112 is normally placed on the table 116 via the spacer 150. A receiving piece 114 for the iron core 10 is placed on the seat plate 112. The seat plate 112 is connected to the hydraulic cylinder 152.

  The transfer table 162 of the iron core 10 is provided flush with the receiving piece 114 in a state where the table assembly 32 is lowered as shown in FIG. 4, and opposite V-shaped grippers 164 are opposed to both sides of the transfer table 162. A plurality of pairs are provided, and the grippers 164 are moved back and forth as indicated by arrows g with respect to the iron core 10. Therefore, the iron core 10 held by the gripper 164 can be placed on the receiving piece 114 with the central opening 10A facing upward. In this state, hydraulic pressure is supplied to the hydraulic cylinder 140, the piston rod 142 is raised, the table assembly 32 is moved toward the mandrel-push blade assembly 30, and the central opening 10 </ b> A of the iron core 10 on the receiving piece 114. Is in a state where the mandrel 118 is swallowed, and this is referred to as the raised position of the table assembly 32. Then, hydraulic pressure is introduced into the hydraulic cylinder 124, and the push blade 120 is moved radially inward simultaneously or sequentially, whereby the iron core 10 is sequentially cut from the outer layer, and the iron core 10 is divided into eight at a time as an iron core section. Is done. When eight divisions of the iron core 10 are completed, the hydraulic pressure of the hydraulic cylinder 124 is released, the push blades 120 are retracted all at once, then the hydraulic pressure of the hydraulic cylinder 140 is released, and the table assembly 32 is lowered to the lowest position. Then, by introducing hydraulic pressure into the hydraulic cylinder 152, the seat plate 112 is rotated and inclined counterclockwise around the pin 144 as shown by an imaginary line 112 ', and the cut iron core section is cut through the chute 160. Discharged.

  Although the iron core is subdivided into strip-like pieces by the cutting device of the first or second embodiment, the presence of spot welds and the iron core side wall are partially solidified and varnished between the windings. In some cases, after cutting, it is often separated into individual layers and remains in a solid state, and it is difficult to completely clean the PCB oil between the winding layers. Therefore, a device that disperses the cut iron core pieces into individual thin plate pieces is necessary. FIG. 5 shows a first embodiment of such a device, and the scattering device of this embodiment is divided into two parts or four parts as in the embodiment of FIGS. It is suitable for the case where the core section 10 'after cutting is long and curved. In FIG. 5, the gripper 50 is composed of a first jaw 52 and a second jaw 54, and grips the core section 10 ′ after cutting between the first jaw 52 and the second jaw 54 from both sides. The gripper 50 is provided so as to be able to reciprocate back and forth by a drive mechanism (not shown). Three pairs of baffle pins 56a, 56b, and 56c are provided to be spaced apart from each other in parallel, and the distance between the baffle pins 56 is sequentially changed so that it can hit different parts of the core section 10 ′ after cutting. The distance between the pin pairs 56a, 56b, and 56c can be adjusted. The gripper 50 is provided to be movable back and forth as indicated by arrows A and B.

  The state of (a) in FIG. 5 shows a state before the start of the scattering operation, and the core piece 10 ′ is in contact with the first pair of baffle pins 56a on the concave surface side. By moving the gripper 50 in the direction of arrow A from this state, the core section 10 'is bent. That is, (b) is bent in the direction opposite to the initial direction, and comes into contact with the second pair 56b of baffle pins, and (c) is released by passing through the third pair 56b of baffle pins. Indicates a state where is scattered. By appropriately changing the distance between the pin pairs 56a, 56b, and 56c, the core section 10 'comes into contact with the pin pairs 56a, 56b, and 56c at different locations during the bending operation, thereby realizing good scattering. be able to. Then, by reversing the moving direction of the gripper from the state (c), the pin pairs 56c, 56b, 56a are sequentially passed, and bending in the opposite direction is given. At this time, the third pin pair 56c is widened in the direction of the arrow j as shown by a broken line 56c ', and the first pin pair 56a is changed in the direction of the arrow k as shown by a broken line 56a'. it can. By such a change in spacing, the pins come into contact with the iron wire piece 10 'at different locations, so that a better scattering effect can be obtained. In the case of the scattering means shown in FIG. 5, the central portion of the core section 10 ′ held by the gripper 50 is not loosened. Therefore, by slightly shifting the gripping part of the core section 10 'and repeating the same scattering operation as in (a) to (c), the core section 10' is scattered without any wrinkles. Can be separated into individual sheet sections.

  As a modification of the embodiment of FIG. 5, the gripper 50 may be fixed and the baffle pin may be rotated back and forth. Even in this configuration, front and rear bending is applied to the core section 10 ′, and it is possible to promote scattering. In addition, by providing a means for adjusting the position of the baffle pin with respect to the core section, and allowing the baffle pin to come into contact with the core section at different positions, it is possible to realize a complete scattering operation over the entire core section. .

  FIG. 6 shows another embodiment of the scraping device. The scraping device of this embodiment is divided into eight subdivisions of the iron core like the cutting device of FIGS. Suitable for inconspicuous curves. In this embodiment, the scattering device includes a hopper 58 of the core piece 10 ′, a plurality of pairs of rollers 60, 62, 64 that are arranged to face each other, and a carry-out chute 66. Each pair of grooved rollers 60, 62, 64 is spaced apart by a suitable gap and is rotated at the same speed in the opposite direction by transmission mechanisms 67, 68, 70 comprising gears and pulley-belts. Each roller pair 60, 62, 64 is of a spring float type, and at least one of the rollers is knurled on the peripheral surface to increase the contact resistance. Then, in each roller pair 60, 62, 64, one roller diameter φD is made different from the other roller diameter φd, and the surface speed is changed, so that the core section 10 'moves between each pair 60, 62, 64 rollers. It is intended to realize an efficient scattering operation by varying the surface speed when passing through and forcibly causing slippage. In the roller pair 60, 62, 64, the distance between the rollers is gradually reduced, and the surface speed is increased as the roller pair moves downstream with respect to 60, 62, 64. As a result, as the roller pair 60, 62, 64 passes between the rollers, the scattering can be sequentially advanced. That is, it is separated as thick as 10 "by slip when passing through the roller pair 60 having a large interval, and is separated into intermediate thickness as 10" 'by slip in the intermediate roller pair 62, and the last roller pair 64 Each piece is separated into thin slices S by slip, and is carried out from the carry-out chute 66.

  In the above embodiment, the scattering process is performed after cutting the iron core, but the scattering process before cutting is also possible. As a scatter treatment method before cutting, a tapered mandrel can be pressed against the center opening of the iron core, thereby causing slippage between the iron core winding layers and breaking the adhesion between the iron core winding layers.

FIG. 1 is a plan view of an iron core cutting device according to a first embodiment of the present invention. FIG. 2 is a side view of the iron core cutting device of FIG. FIG. 3 is a plan view of an iron core cutting device according to a second embodiment of the present invention. FIG. 4 is a side view of the iron core cutting device of FIG. FIG. 5 is a schematic view showing an embodiment of an apparatus for scraping the iron core after separating the strips. FIG. 6 is a schematic view showing another embodiment of the scattering apparatus.

Explanation of symbols

10 ... Iron core
12, 120 ... Seat plate
14, 114 ...
16, 116… Table
18, 118 ...
20, 120 ... push blade
22, 122 ... piston rod 30 ... mandrel-cutting blade assembly 32 ... table assembly 50 ... gripper 52 ... first jaw 54 ... second jaw
56a, 56b, 56c ... baffle pin 58 ... hopper
60, 62, 64 ... Roller pair 66 ... Unloading chute
67, 68, 70… conduction mechanism

Claims (4)

In the method of scattering the core section cut and disassembled from the transformer, the core section gripped from both sides at the center is reciprocated, and the core section being reciprocated is not gripped by the baffle pins fixedly installed on both sides of the moving path Abutting at the site and bending the iron core piece to cause bending between the laminated plates constituting the iron core piece, and separating the core pieces into individual thin plates by the deviation between the laminated plates How to scatter. In a method of scattering an iron core piece cut and disassembled from a transformer, the iron core piece is passed between the roller pairs so as to come into contact with the rollers constituting the roller pair, and the rollers rotating in the opposite direction constituting the roller pair. A scattering method characterized in that the surface speed of the steel sheet is appropriately changed to cause mutual displacement between the laminated plates in contact with the rollers, and the core piece is separated into individual thin plates by the displacement between the laminated plates. A device for separating individual thin plates after dividing a transformer core into strip-shaped sections, means for reciprocating the core sections in a straight line direction while sandwiching and gripping the core sections from both sides in the stacking direction, and an iron core An iron core scattering apparatus comprising: a baffle pin provided on both sides of a path of reciprocating movement of a section and abutting a moving core section at a non-gripping portion and allowing the section to bend and pass. It is a device to scatter the individual thin plates after dividing the transformer core into strip-shaped sections, and it is arranged to face each other across the core sections after cutting and dividing, and a plurality of pairs in contact with the surfaces of the facing core sections. An iron core scattering apparatus comprising: a roller; and a rotation driving means for rotating the respective pairs of rollers in opposite directions and with different surface speeds.

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