JP2014155997A - Disuse treatment device and disuse treatment method of used rotor shaft of steam turbine for power generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and a method for performing disuse treatment of a used rotor shaft of steam turbine.SOLUTION: A disuse treatment device (disassembling device) 12 includes a band saw movable base 16 placed and supported on a base 14, a band saw support structure 18 supported on the band saw movable base 16 movably in the horizontal direction, a band saw device 20 supported on the band saw support structure 18 movably up and down, and work receiving stands 22, 24, 26, 28 for supporting a rotor shaft 10 on the base 14 by shaft parts 10a on a plurality of spots in the direction of the center axis X of the rotor shaft 10.

Description

  The present invention relates to an apparatus and a method for disposing of a used rotor shaft of a steam turbine used in nuclear power generation, thermal power generation and the like.

  The rotor shaft of the power generation turbine rotor is, for example, a large structure having a length of 10 meters, a maximum diameter (with the rotor blades removed) of 2.4 meters, and a weight of 120 tons. The rotor shaft of the turbine rotor that has been used and removed from the turbine apparatus is currently transported and stored in a predetermined storage location within the site of the power plant.

  Since the rotor shaft is large in size and weight, a special crane vehicle or a special mobile vehicle is required to move to the storage location. In addition, it took a lot of time and effort to move, such as transport routes during transportation and ensuring safety. Currently, the number of used rotor shafts has increased, making it difficult to secure a storage location. However, as long as the present inventors have investigated, there has been no abolition processing method for solving these problems.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a used rotor shaft abolition processing apparatus and abolition processing method capable of solving the above-described problems.

  The abolition processing apparatus of the present invention is supported by a band saw moving base supported on a foundation, a band saw supporting structure supported by the band saw moving base so as to be movable in the horizontal direction, and supported by the band saw supporting structure so as to be movable up and down. And the rotor shaft of the power generation steam turbine is cut into a ring shape by the descending band saw device so that the rotor shaft is placed on the foundation at a plurality of shaft portions in the direction of the central axis of the rotor shaft. And a work cradle that is supported. According to this, in a state where the rotor shaft is supported by the work cradle, the band saw support structure is moved on the band saw moving base to move the band saw device to a predetermined cutting position of the rotor shaft, and the band saw device at that position. Can be lowered to cut the rotor shaft into a ring shape. According to this, since the rotor shaft is cut into a ring shape, the transportation becomes easy and the transportation from the power plant is also facilitated.

  In the abolition processing apparatus according to the present invention, the band saw support structure is movable on the band saw moving base to a position where the band saw apparatus is retracted to the outside of the rotor shaft supported by the work cradle. The stand self-supports the rotor shaft with at least two shaft portions opposite to the direction in which the band saw support structure retracts in the direction of the central axis of the rotor shaft with respect to the shaft portion at the cutting position of the rotor shaft. A work cradle to be included. According to this, the rotor shaft can be independently supported on the work cradle with the band saw device retracted, and the rotor shaft can be cut by moving the band saw device to the cutting position after the support.

  In the abolishment processing apparatus of the present invention, the work cradle that supports the rotor shaft independently may be a work cradle that supports the rotor shaft independently on the foundation without the band saw moving base. . According to this, the rotor shaft can be independently supported on the foundation without using the band saw moving base.

  In the abolition processing apparatus of the present invention, the work cradle may include a cutting position work cradle that is supported by the band saw moving base and supports a shaft portion immediately below the saw blade of the band saw device. According to this, it can cut by supporting a rotor axis | shaft to a workpiece cradle by the axial part of the cutting position.

  In the abolition processing apparatus according to the present invention, the cutting position work cradle may have a groove formed on the upper surface thereof to remove the saw blade. According to this, the rotor shaft can be cut by supporting the rotor shaft by removing the saw blade by the groove portion at the shaft portion at the cutting position. Even after cutting, both cut portions can be supported on both sides of the groove.

  In the abolition processing apparatus of the present invention, the work cradle further includes a non-cutting position work cradle that is supported by the band saw moving base and supports a shaft portion other than a position directly below the saw blade of the band saw apparatus, The position work cradle and the non-cutting position work cradle may be supported by the band saw moving base so as to be close to and away from each other in the direction of the central axis of the rotor shaft. According to this, it is possible to perform cutting while supporting the rotor shaft with a plurality of work cradles on the band saw moving base. Since the workpiece holder for the cutting position and the workpiece holder for the non-cutting position can be moved closer to and away from each other in the direction of the central axis of the rotor shaft, the distance between the workpiece supports even if the distance between the shaft portions of the rotor shaft varies. Can be adjusted to support the shaft portions at different positions.

  In the abolition processing apparatus of the present invention, the work cradle supported by the band saw moving base may include a work cradle whose support surface can be raised and lowered. According to this, even if the diameter of the shaft portion of the rotor shaft differs depending on the shaft portion, the shaft portion can be supported by the support surface by raising and lowering the support surface of the work cradle.

  The abolition processing apparatus of the present invention further comprises a work loading table supported by legs on the band saw moving base, and the work cradle supported by the band saw moving base is moved through the work loading table. A work cradle supported by a base, wherein the band saw support structure has a frame structure in which a left column, a right column, an upper connection beam, and a lower connection beam are connected to each other, and the lower connection beam moves the band saw When the band saw support structure moves on the band saw moving base, the lower connection is arranged in a space formed between the work loading table supported by the legs on the base and the band saw moving base. The beam may move in the space. According to this, since the band saw support structure has a frame-type structure, it has high rigidity and can stably support the band saw device. In addition, the work cradle supported by the band saw moving base is supported on the band saw moving base via the work loading table, and the lower connecting beam of the band saw support structure is formed in the space formed between the work loading table and the band saw moving base. Since it is arranged, when the band saw support structure moves, the lower connecting beam can move except for the work cradle supported by the band saw moving base.

  In the abolition processing apparatus of the present invention, the work cradle supported by the band saw moving base includes a work cradle having a flat horizontal surface that supports the rotor shaft, and the horizontal surface of the work cradle includes: A pair of sheet piles that prevent rolling of the cut rotor shaft is disposed on both sides of the central axis of the rotor shaft, and the pair of sheet piles is supported on the horizontal plane so as to be slidable in a direction perpendicular to the central axis of the rotor shaft. Can be. According to this, even if the center axis of the rotor shaft is deviated from the planned position while the rotor shaft is supported by another work cradle, the work cradle having a horizontal plane absorbs the deviation in the horizontal plane. The rotor shaft can be supported. Moreover, rolling of the rotor shaft cut by the pair of sheet piles can be prevented.

  The abolition processing apparatus of the present invention may have a structure in which the band saw moving base can be divided at a division position parallel to the central axis of the rotor shaft. According to this, it is possible to divide the band saw moving base at a dividing position parallel to the central axis of the rotor shaft and carry it on a vehicle such as a truck.

  The abolition processing method of the present invention is configured such that the abolition processing device can be disassembled and assembled, disassembled and divided into a plurality of parts, loaded on a plurality of vehicles, carried into a power plant, and used The abolishment processing device is assembled at the place where the turbine shaft is cut and the rotor shaft is cut off. After the cutting process is finished, the discontinuation processing device is disassembled and loaded on a plurality of vehicles. It will be carried out from. According to this, it is possible to dismantle the rotor shaft by disassembling one abolition processing device, loading it on a plurality of vehicles, and carrying it to power stations in various places.

  The abolition processing method of the present invention is to disassemble the rotor shaft of the power generation steam turbine by cutting it into a ring shape using a band saw device at the position of the shaft portion of the rotor shaft that is out of the wheel portion. According to this, since the rotor shaft is cut into a ring shape, the transportation becomes easy and the transportation from the power plant is also facilitated. Further, since the cutting is performed at the position of the shaft part that is out of the wheel part of the rotor shaft, the cutting can be performed in a short time. Further, if the rotor shaft used in nuclear power generation is cut with a burner, the radioactive material adhering to the rotor shaft may be taken into the metal melted by the burner and cannot be decontaminated. On the other hand, if a band saw device is used, cutting can be performed without melting the metal, and thus decontamination after cutting is easy.

  The abolition processing method of the present invention supports the rotor shaft on a foundation, and disposes the band saw device on the foundation so as to be movable in the direction of the central axis of the rotor shaft with respect to the rotor shaft. The cutting can be performed by moving to the shaft portion of the cutting position. According to this, the rotor shaft is supported on the foundation, the band saw device can be moved in the direction of the central axis of the rotor shaft, and cutting can be performed at a predetermined cutting position of the rotor shaft.

  In the abolition processing method of the present invention, the rotor shaft is lifted with a crane and supported on the foundation in a state in which the band saw device is retracted from the cutting position in the direction of the central axis of the rotor shaft, and then the band saw The apparatus may be moved in the direction of the central axis of the rotor shaft to perform the cutting at the shaft portion at the cutting position. According to this, the rotor shaft can be lifted by the crane and supported on the foundation without colliding with the band saw device.

  In the abolition processing method of the present invention, the rotor shaft may be supported by the plurality of shaft portions on the foundation via a work cradle to perform the cutting. According to this, a rotor shaft can be cut | disconnected by supporting on a foundation | substrate via a workpiece cradle with a shaft part of several places.

  In the abolition processing method of the present invention, the work cradle includes a work cradle that supports the rotor shaft at a shaft portion at the cutting position, and the work cradle supported at the shaft portion at the cutting position is the cutting position. The shaft portion of the cutting position can be supported on both sides in the direction of the central axis of the rotor shaft. According to this, the rotor shaft can be supported by the shaft portion at the cutting position for cutting, and the shaft portion at the cutting position can be continuously supported on both sides of the cutting position even after cutting.

  In the abolition processing method of the present invention, the work cradle supports the rotor shaft at a plurality of shaft portions on both sides in the direction of the central axis of the rotor shaft across the cutting position. it can. According to this, the rotor shaft can be continuously supported on both sides of the cutting position even after cutting.

  In the abolition processing method of the present invention, the work cradle self-supports the rotor shaft on the foundation by at least two shaft portions closer to one end side in the direction of the central axis than the shaft portion of the cutting position. It can include a work cradle on the foundation. According to this, the rotor shaft is cut in a state where the rotor shaft is independently supported on the foundation by the workpiece support on the foundation at at least two shaft portions closer to one end side in the direction of the central axis than the shaft portion of the cutting position. Can do.

  In the abolition processing method of the present invention, the cutting may be performed in a state where a rotor blade is removed from the rotor shaft. According to this, since the maximum diameter of the rotor becomes small, the saw blade can easily enter the shaft portion.

  The abolition processing method of the present invention has a structure in which the rotor shaft has a plurality of wheel portions arranged symmetrically with respect to a central position in the direction of the central axis of the rotor shaft, and the rotor shaft is supported on the foundation. Cutting the shaft part on one end side, then lifting the remaining part of the rotor shaft with a crane, turning it left and right and supporting it on the foundation, and cutting the shaft part on the other end side It can be. According to this, compared with the case where the rotor shaft is sequentially cut only from one end side, the center of gravity position in the direction of the central axis of the rotor shaft is deviated from the central position in the direction of the central axis of the rotor shaft. Less. Therefore, the inclination of the rotor shaft when the rotor shaft is lifted by the crane can be suppressed, and the work can be performed safely.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows Embodiment 1 of the abolition processing apparatus of this invention, and shows the state which cut | disconnects a rotor shaft using this abolition processing apparatus 12, (a) is an AA arrow line view of (b), (b ) Is a front view. It is a see-through | perspective perspective view in the state of FIG. It is a perspective view which shows the state which decomposed | disassembled the abolition processing apparatus 12 of FIG. 2 into each part. It is a perspective view shown in the state which divided | segmented the right-and-left division | segmentation type | mold band saw movement base 16 of FIG. It is a perspective view which shows the left-right support | pillars 18L and 18R of FIG. It is a perspective view which shows the workpiece | work loading table 66 of FIG. FIG. 4 is a perspective view showing a fixed work cradle 22 in FIG. 3. FIG. 4 is a perspective view showing a movable work cradle 24 in FIG. 3. It is a perspective view which shows the band saw apparatus (cutting head unit) 20 of FIG. It is a perspective view which shows process (1)-(3) which carries out cutting | disassembly processing of the rotor shaft | axis 10 using the abolition processing apparatus 12 of FIG. It is a perspective view which shows process (4)-(6) following FIG. 10A. It is a perspective view which shows process (7)-(9) following FIG. 10B. It is a perspective view which shows process (10)-(12) following FIG. 10C. It is a perspective view which shows process (13)-(15) following FIG. 10D. It is a perspective view which shows process (16)-(19) following FIG. 10E. 11A to 11C are side views showing a process for one cycle in which the n-th cutting is performed among the processes of cutting and disassembling the rotor shaft 10 using the abolition processing apparatus 12 of FIG. Indicates steps (n1) to (n2). FIG. 11B is a side view showing steps (n3) to (n4) following FIG. 11A. FIG. 11B is a side view showing steps (n5) to (n6) continued from FIG. 11B. FIG. 6 is a diagram showing a second embodiment of the abolition processing apparatus according to the present invention in which the movement of the band saw support structure 18 by the band saw movement base 16 according to the first embodiment is changed from a double-axis drive to a single-axis drive; It is a see-through | perspective perspective view which shows the state which cut | disconnects the rotor shaft | axis 10 using FIG. It is a perspective view which shows the right-and-left division | segmentation type | mold band saw movement base 16 'of FIG.

<< Embodiment 1 >>
A first embodiment of the present invention will be described with reference to FIGS. 1 and 2 show a state in which a rotor shaft (hereinafter also referred to as “work”) 10 of a power generation turbine rotor is cut and disassembled using an abolition processing device (disassembly device) 12 according to the present invention. The workpiece 10 is cut by the disassembly device 12 after removing the rotor blades (not shown) from the outer peripheral edge of the wheel portion 10b. The dismantling device 12 includes a band saw moving base 16 placed and supported on a foundation 14 such as a floor of a power plant building, a band saw supporting structure 18 supported on the band saw moving base 16 so as to be movable in the horizontal direction, The band saw device 20 supported on the front surface of the band saw support structure 18 so as to be movable up and down and the work 10 are supported on the band saw moving base 16 (that is, the work 10 is indirectly supported on the base 14 via the band saw moving base 16). ) Workpiece cradles (bases) 22 and 24 on the band saw moving base, and base work cradles (bases and bevel bases) 26 and 28 for directly supporting the work 10 on the base 14 (work cradle 28 is shown in FIG. 1)). Since the shaft portion 10a of the rotor shaft 10 (the small diameter portion off the wheel portion 10b) has a different diameter depending on the location, the rotor shaft 10 is supported and cut with the central axis X always at a constant horizontal posture. As can be done, the work cradles 22, 24, 26, and 28 are all configured to be height adjustable. The disassembling apparatus 12 horizontally supports the workpiece 10 on the base 14 with workpiece cradles 22, 24, 26, and 28, and moves the band saw support structure 18 on the band saw moving base 16 in the direction of the central axis X of the workpiece 10. Then, the band saw device 20 is positioned at a predetermined cutting position, and the band saw device 20 is lowered while rotating the saw blade 139 at that position, and the shaft portion 10a of the workpiece 10 is cut.

The disassembling apparatus 12 is configured to be disassembled and assembled into the following 13 parts shown in FIG. Each part can be stored in a container and transported by truck. In addition to these 13 parts, the work cradles 26 and 28 (FIGS. 1, 2, 10, and 11) are used for disassembling the work 10.
-Left-side split base 16L of the band saw moving base 16
・ Right-side split base 16R of the band saw moving base 16
-Left column 18L of the band saw support structure 18
-Right strut 18R of the band saw support structure 18
-Upper connecting beam 18U of the band saw support structure 18
-Lower connecting beam 18B of the band saw support structure 18
・ Work loading table 66
・ Fixed work cradle 22
・ Mobile work cradle 24
・ Band saw device (cutting head unit) 20
Cutting head balance hydraulic cylinder 51
・ Hydraulic unit 52
・ Power panel 58
The dismantling device 12 is disassembled into these 13 parts, loaded onto a truck, and loaded into a power plant. The dismantling device 12 is assembled at a place where the rotor shaft in the power plant is cut, and the rotor shaft is cut. After the cutting is completed, the dismantling device 12 is disassembled again, loaded on a truck, and carried out of the power plant. Thereby, one dismantling apparatus 12 can be conveyed to the power plants in various places and the rotor shaft can be cut. Hereinafter, each part of FIG. 3 will be described.

<Band saw moving base 16>
The band saw moving base 16 is shown in FIG. The band saw moving base 16 has a structure that can be divided into left and right portions 16L and 16R at a position corresponding to a position immediately below the central axis X of the workpiece 10 at the time of cutting. The left split base 16L has a drive mechanism. The right split base 16R does not have an inherent drive mechanism, and the driving force is distributed and supplied from the left split base 16L. The left divided base 16L has a main body 30L in which four steel materials 30L1, 30L2, 30L3, and 30L4 are assembled in a rectangular frame shape and welded. Two linear rails 32L and 32L are laid horizontally on the upper surface of the long side 30L1 outside the main body 30L so as to be parallel to the central axis X of the workpiece 10 at the time of cutting. A ball screw 33L is laid between the linear rails 32L and 32L. The rotation of the motor 34L (geared motor) is transmitted to the ball screw 33L through the bevel gear box 36L and is driven to rotate. A left column support seat 38L is supported on the linear rails 32L and 32L so as to be movable along the linear rails 32L and 32L. A ball screw 33L is screwed into the left column support seat 38L. The left column support seat 38L moves along the linear rails 32L and 32L following the rotation of the ball screw 33L. A counter shaft 40L is drawn from the bevel gear box 36L along the short side 30L3. The countershaft 40L is supported by the bearing 42L at a position slightly before the tip. Work loading table seats 44a and 44b are fixedly mounted on the upper surfaces of the short sides 30L3 and 30L4 of the main body 30L.

  The right split base 16R has a main body 30R in which four steel members 30R1, 30R2, 30R3, and 30R4 are assembled in a rectangular frame shape and welded, and has a line-symmetric shape with respect to the left main body 30L. Two linear rails 32R and 32R are laid horizontally on the upper surface of the long side 30R1 outside the main body 30R so as to be parallel to the central axis X of the workpiece 10 at the time of cutting. A ball screw 33R is laid between the linear rails 32R and 32R. On the linear rails 32R and 32R, a right column support seat 38R is supported so as to be movable along the linear rails 32R and 32R. A ball screw 33R is screwed onto the right column support seat 38R. The right column mounting seat 38R moves along the linear rails 32R and 32R following the rotation of the ball screw 33R. One end of the ball screw 33R is connected to the bevel gear box 36R. A counter shaft 40R is laid on the short side 30R3 of the main body 30R. One end of the counter shaft 40R is connected to the ball screw 33R through a bevel gear box 36R. The counter shaft 40R is supported by the bearing 42R at a position slightly before the other end. A countershaft manual brake 46 is provided on the bearing 42R. When the counter shafts 40L and 40R are not connected, the counter shaft manual brake 46 is applied so that the counter shaft 40R does not rotate. A counter shaft connection coupling 48 is provided at the other end of the counter shaft 40R.

  The left and right split bases 16L and 16R are bolts that connect the connection flanges 50L1 and 50R1 provided on the opposing end surfaces of the short sides 30L3 and 30R3 and the connection flanges 50L2 and 50R2 provided on the opposing end surfaces of the short sides 30L4 and 30R4, respectively. By being connected to each other by fastening, they are assembled and integrated so as to be disassembled. At this time, the left and right countershafts 40L and 40R are connected by a countershaft connection coupling 48. When the counter shafts 40L and 40R are connected, the counter shaft manual brake 46 is released. As a result, the rotation of the motor 34L is transmitted to the left and right ball screws 33L and 33R, and the left and right column mounting seats 38L and 38R are always moved to the same position in the direction of the central axis X of the workpiece 10 to move the band saw support structure 18. The workpiece 10 is translated in the direction of the central axis X.

<< Band saw support structure 18 >>
The band saw support structure 18 shown in FIG. 3 includes a steel left column 18L, a right column 18R, an upper connecting beam 18U, and a lower connecting beam 18B that are assembled into a rectangular frame and connected to each other by bolting. Thus, it is assembled and integrated so that it can be disassembled. Since the band saw support structure 18 has a rectangular frame shape (box-shaped frame structure), it has high rigidity. The left and right struts 18L and 18R are shown in FIG. The left column 18L is formed in an L shape. The lateral side 18La constituting the L-shaped lower part is detachably fixed to the left column support seat 38L (FIG. 4) of the band saw moving base 16 by bolting. A hydraulic unit 52 is detachably mounted on the upper surface of the horizontal side portion 18La. The hydraulic unit 52 includes a cutting head balance hydraulic cylinder 51 of FIG. 3, a hydraulic cylinder 102 for raising and lowering the work support surface of the fixed work cradle 22 of FIG. 7, and a hydraulic cylinder for raising and lowering the work support surface of the movable work cradle 24 of FIG. 127, a hydraulic drive source such as a tension hydraulic cylinder 55 of the band saw device 20 of FIG. A linear rail 54L is laid vertically on the front surface of the L-shaped vertical side portion 18Lb. A band saw mounting seat 56L is mounted on the linear rail 54L so as to be movable up and down.

The right column 18R is formed in the same L shape as the left column 18L. The horizontal side portion 18Ra constituting the lower portion of the L shape is detachably fixed to the right column support seat 38R (FIG. 4) of the band saw moving base 16 by bolting. A power panel 58 is detachably mounted on the upper surface of the horizontal side portion 18Ra. The power panel 58 is used for each electric device of the dismantling device 12

(Supply power is supplied to the band saw support structure moving motor 34L in FIG. 4, the band saw lifting motor 62 in FIG. 5, the hydraulic unit 52 in FIG. 5, the saw blade rotating motor 141 in FIG. 9, etc.) A linear rail 54R and a ball screw 60 are vertically laid on the front surface of the side portion 18Rb, and a band saw mounting seat 56R is mounted on the linear rail 54R so as to be movable up and down, and a ball screw 60 is mounted on the band saw mounting seat 56R. The ball screw 60 is rotated by the rotation of the motor 62 (servo motor) being transmitted through the speed reducer 64. The band saw mounting seat 56R is driven by the rotation of the ball screw 60 and the linear rail 54R. The band saw device 20 (FIG. 3) is attached to the left and right band saw mounting seats 56L and 56R. Right and left strut 18L driven by the motor 62 to move (lift) parallel along the 18R. In this case a band saw mounting seat 56L is moved up and down by being driven by the lifting of the band saw device 20.

<< Work Loading Table 66 >>
A workpiece loading table 66 is shown in FIG. The work loading table 66 is made of steel and has a rectangular planar shape. Legs 68 a, 68 b, 68 c, 68 d extending downward are provided at each corner of the rectangle, and a space 69 is formed on the lower surface of the work loading table 66. The work loading table 66 is fixed on the band saw moving base 16 by fixing each leg 68a, 68b, 68c, 68d to the work loading table seats 44a, 44b, 44c, 44d of the band saw moving base 16 (FIG. 4) with bolts. Mounted and fixed. A fixed work receiving base 70 is fixedly attached to the front end of the table surface of the work loading table 66. A fixed work receiving base 22 (FIGS. 3 and 7) is fixedly supported on the fixed work receiving base 70. A movable work receiving pedestal 72 is disposed behind the fixed work receiving pedestal 70 on the table surface of the work loading table 66. The movable work pedestal 72 is fixedly supported on the movable work pedestal 72. Linear rails 74 and 76 are laid on the table surface of the workpiece loading table 66, and the movable workpiece receiving base 72 is parallel to the central axis X of the workpiece 10 (depending on the band saw device 20). It is mounted so as to be movable in a direction perpendicular to the cut surface of the workpiece 10. A ball screw 78 is laid between the linear rails 74 and 76. The ball screw 78 is screwed into a ball screw nut 80 fixedly attached to the movable work pedestal 72. The ball screw 78 is supported by a ball screw housing 82 fixed to the intermediate connection steel material 67 of the workpiece loading table 66 so as to be rotatable in the axial direction and immovable in the axial direction. A handle 84 is attached to the rear end of the ball screw 78. With the above configuration, when the handle 84 is manually rotated, the movable work receiving base 72 moves in a direction parallel to the central axis X of the work 10, and as a result, the fixed work receiving base 70, the movable work receiving base 72, The distance between is changed. An inspection platform 86 in which a mesh-like expanded metal is extended is formed in a region opposite to the region where the workpiece receiving bases 70 and 72 are arranged with the intermediate connection steel material 67 on the upper surface of the workpiece loading table 66 interposed therebetween. On the inspection stand 86, an operator rides on various operations (rotation of the handle 84, operation of the bolt 98 of the fixed work cradle 22 in FIG. 7 and operation of the bolt 121 of the mobile work cradle 24 in FIG. 8, Operation of the sheet piles 126, 126 and the wheel sheet piles 128, 128 of FIGS. 1 and 2). Since the inspection stand 86 is made of a mesh-like expanded metal, chips generated when the workpiece 10 is cut can be dropped down through the mesh.

<< Fixed work cradle 22 >>
The fixed work cradle 22 is shown in FIG. The fixed work cradle 22 is made of steel. The fixed work cradle 22 is configured to be adjustable in height. Accordingly, the shaft portion 10a can be supported by adjusting the height according to the shaft portion 10a having a different diameter depending on the position in the direction of the central axis X (and thus the height of the supporting position is different). The fixed work pedestal 22 includes a flange seat 88 that is detachably fixed to the fixed work pedestal base 70 of the work loading table 66 (FIG. 6) by bolting, and a base that is erected and fixed to the flange seat 88 by welding. 90 and elevating plates 92 and 94 supported by the base 90 so as to be movable up and down with the upper portion of the base 90 sandwiched in the front-rear direction. Long holes 96 extending in the vertical direction are formed in the vicinity of the left and right side edges of the elevating plates 92 and 94, and bolts 98 are passed through the long holes 96, respectively. Bolt 98 is screwed into base 90. By tightening the bolt 98, the lifting plates 92 and 94 are fixed to the base 90, and by loosening the bolt 98, the lifting plates 92 and 94 can be lifted and lowered with respect to the base 90. In FIG. 7, the long hole 96 and the bolt 98 appear only for the front lifting plate 92, but the long hole 96 and the bolt 98 are similarly arranged on the rear lifting plate 94 side. A receiving member 100 is sandwiched between the upper and lower plates 92 and 94 and integrated by welding. Therefore, the lifting plates 92 and 94 and the receiving member 100 are lifted and lowered integrally with the base 90. A hydraulic cylinder 102 is disposed between the upper surface of the base 90 and the lower surface of the receiving member 100. By driving the hydraulic cylinder 102 with all the bolts 98 loosened, the lifting plates 92 and 94 and the receiving member 100 are lifted and lowered together. The upper surface (support surface) 100a of the receiving member 100 is formed in a flat surface instead of a beveled base unlike the workpiece receiving bases 26 and 28 on the foundation. This is because there is a slight deviation (horizontal deviation perpendicular to the central axis X of the workpiece 10) in the position of the fixed workpiece receptacle 22 with respect to the workpiece 10 supported by the workpiece receptacles 26 and 28 on the foundation. However, this is because the workpiece 10 can be supported by the receiving member 100 (that is, the workpiece 10 can be supported even at a position away from the longitudinal center of the upper surface of the receiving member 100). Guides 104 are fixed to the base 90 to guide the left and right sides of the elevating plates 92 and 94. The elevating plates 92 and 94 and the receiving member 100 are lifted and lowered without being inclined by the guide 104, and the upper surface 100a of the receiving member 100 is always kept in a horizontal plane. The height of the fixed work cradle 22 is adjusted by loosening all the bolts 98 (two in one place and eight in total) with the upper surface of the hydraulic cylinder 102 in contact with the lower surface of the member 100. The operation is performed by driving the hydraulic cylinder 102 to adjust the height of the receiving member 100, and tightening all the bolts 98 to fix the receiving member 100 to the base 90 after the adjustment is completed. A groove portion 108 is formed in the central portion of the upper surface 100a of the receiving member 100 along the longitudinal direction (a direction perpendicular to the central axis X of the workpiece 10) to remove the saw blade 139 of the band saw device 20 (FIG. 9). Yes. A receiving tray 106 is fixed to the receiving member 100 with an inclination. The tray 106 receives swarf and cutting oil when the workpiece 10 is cut. The chips and cutting oil received by the tray 106 flow along the inclination and are collected in a coolant tank 106 a formed at the end of the tray 106.

<< Mobile work cradle 24 >>
A movable work cradle 24 is shown in FIG. The movable work cradle 24 includes a flange seat 111, a base 113, elevating plates 115 and 117 formed with elongated holes 119, bolts 121, a guide 123, a receiving member 125, and a hydraulic cylinder 127. A groove portion (corresponding to the groove portion 108 in FIG. 7) is not formed on the upper surface (support surface) 125a of the receiving member 125, and the tray 106 (FIG. 7) of the fixed work receiving base 22 is formed on the receiving member 125. Otherwise, it has the same configuration as the fixed work cradle 22 and is operated in the same way. The mobile work cradle 24 is detachably fixed to the mobile work cradle 72 by fixing the flange seat 111 to the mobile work cradle 72 of the work loading table 66 (FIG. 6) by bolting. When the handle 84 in FIG. 6 is rotated in the fixed state, the movable work cradle 24 moves in the direction of the central axis X of the work 10 and the distance from the fixed work cradle 22 is adjusted. In addition, after supporting the workpiece | work 10 with the upper surface 125a of the receiving member 125, in order to prevent rolling of a cut product (cut-off part) on the upper surface 125a of the receiving member 125, as shown by a dashed-two dotted line in FIG. The shaft sheet piles 126, 126 are slidably mounted in the extending direction of the upper surface and fitted, and the workpiece 10 is cut in this state.

<Band saw device 20>
The band saw device 20 is shown in FIG. In the band saw device 20, a driving wheel 131, driven wheels 133 and 135, and a tension wheel 137 are accommodated in a downward C-shaped head frame 129. Endless band-shaped saw blades are disposed on these wheels 131, 133, 135, and 137. (Blade) 139 is wound around. The driving wheel 131 is rotated by the rotation of the motor 141 (servo motor or inverter motor) being transmitted via the speed reducer 142 to rotate the saw blade 139 in the extending direction. The tension wheel 137 moves in the horizontal direction so as to approach and separate from the driving wheel 131 by the hydraulic cylinder 55, and is adjusted so that the tension of the saw blade 139 becomes a set value. The saw blade 139 extends horizontally in the lower part of the downward opening 143 of the cutting head frame 129 and is exposed. As can be seen from FIG. 1B, the opening 143 is formed in the head frame 129 when the band saw support structure 18 is moved in the direction of the central axis X of the workpiece 10 and when the workpiece 10 is cut by lowering the band saw device 20. Is formed in a sufficient size so as not to contact the wheel portion 10b across the wheel portion 10b of the workpiece 10. The saw blade 139 is hung on blade guides 145 and 147 installed on opposite surfaces of the lower portion of the opening 143 of the cutting head frame 129 and rotated by 90 degrees, and the saw blade is cut in a section sandwiched between the blade guides 145 and 147. The surface of 139 is set up vertically. Thus, the work piece 10 is cut at right angles to the center axis X by the saw blade 139 between the blade guides 145 and 147 by lowering the entire band saw device 20 while rotationally driving the saw blade 139 in the extending direction. be able to.

<Cutting head balance hydraulic cylinder 51>
When the weight of the band saw device 20 is received only by the left and right band saw mounting seats 56L and 56R, the load on the ball screw 60 increases, so that the head frame 129 of the band saw device 20 and the lower connecting beam 18B of the band saw support structure 18 are interposed. The cutting head balance hydraulic cylinder 51 is connected vertically. The cutting head balance hydraulic cylinder 51 is caused to bear a large part of the weight of the band saw device 20 by expanding and contracting the cutting head balance hydraulic cylinder 51 in conjunction with the raising and lowering of the band saw device 20. Thereby, the burden of the ball screw 60 is reduced.

Each part of FIG. 3 is assembled in the following procedures 1 to 10 to constitute the dismantling apparatus 12.
Procedure 1: Assemble the band saw moving base 16 by connecting the left divided base 16L and the right divided base 16R.
Procedure 2: The left column 18L is fixed to the left column support seat 38L of the band saw moving base 16 and fixed.
Procedure 3: The right column 18R is fixed on the right column mounting seat 38R of the band saw moving base 16 and fixed.
Procedure 4: The upper connecting beam 18U is attached between the upper portion of the left column 18L and the upper portion of the right column 18R.
Procedure 5: The lower connecting beam 18B is attached between the lower portion of the left column 18L and the lower portion of the right column 18R.
Procedure 6: The band saw apparatus 20 is mounted by arranging the band saw mounting seats 56L, 56R of the left and right support columns 18L, 18R at the same position in the moving direction.
Procedure 7: The cutting head balance hydraulic cylinder 51 is connected between the head frame 129 of the band saw device 20 and the lower connecting beam 18B of the band saw support structure 18.
Procedure 8: Place the work loading table 66 on the band saw moving base 16 and fix it.
Procedure 9: Attach the fixed work receiving base 22 to the fixed work receiving base 70 of the work loading table 66.
Procedure 10: Mount the movable workpiece cradle 24 on the movable workpiece pedestal 72 of the workpiece loading table 66.
Procedure 11: Install the hydraulic unit 52 and the power panel 58, connect the power cable, hydraulic hose, etc., and complete the assembly.

  A procedure for cutting and disassembling the workpiece 10 at a plurality of shaft portions using the disassembling apparatus 12 having the above-described configuration will be described with reference to FIGS. 10 and 11. FIG. 10 shows a process up to the end of cutting of all the cut portions (however, repeated steps in the middle are not shown), and FIG. 11 shows a process for one cycle for performing the n-th cutting.

<Process (1) (preparation of rotor shaft set): FIG. 10A (1)>
The dismantling device 12 is placed (just placed or fixed with anchor bolts) on the foundation 14 (such as the floor of the power plant building) near the place where the rotor shaft in the power plant is stored. The band saw support structure 18 is retracted on the band saw moving base 16 to the outside in the horizontal direction with respect to the cutting position (a position that does not interfere with setting the workpiece 10). Since the lower connecting beam 18B of the band saw support structure 18 is disposed in the space 69 on the lower surface of the work loading table 66, the band saw support structure 18 can move without being obstructed by the work receiving bases 22 and 24. . Further, the band saw device 20 is retracted to the upper position. Next, the work supports 26 and 28 on the foundation are placed on the foundation 14 on the opposite side to the direction in which the band saw device 20 is retracted horizontally with the cutting position in between (just placed. Fixing with anchor bolts is not necessary). At this time, the workpiece supports 26 and 28 on the foundation are positioned with respect to the dismantling apparatus 12 in the direction of the central axis X where the workpiece 10 is to be arranged and in the horizontal direction perpendicular to the central axis X. That is, with respect to the direction of the central axis X of the workpiece 10, the disassembling apparatus 12 lowers the saw blade 139 from a position above the center in the short direction (position of the groove portion 108) on the upper surface of the fixed workpiece cradle 22. Therefore, when the planned cutting position of the workpiece 10 is arranged at the center in the short direction on the upper surface of the fixed workpiece pedestal 22, the workpiece pedestals 26 and 28 on the foundation remove the wheel portion 10b of the workpiece 10. Then, the workpiece supports 26 and 28 on the foundation are previously positioned at positions where the workpiece 10 can be supported independently by supporting the shaft portion 10a (a position where the center of gravity of the workpiece 10 comes to an intermediate position between the workpiece supports 26 and 28 on the foundation). . Further, in the horizontal direction perpendicular to the central axis X, the workpiece support 26 on the foundation 26, so that the vertical plane passing through the planned placement position of the center axis X of the workpiece 10 passes through the support central axis of the workpiece support 26, 28 on the foundation. 28 is previously positioned. The heights of the workpiece supports 26 and 28 on the foundation are always constant with respect to the foundation 14 with respect to the center axis X according to the diameter of the shaft portion 10a at the position supported by the workpiece supports 26 and 28 on the foundation. The height is adjusted in advance so that the workpiece 10 can be supported in a horizontal posture. Since the distance between the wheel portions 10b varies depending on the location, the distance between the workpiece pedestals 22 and 24 is adjusted in order to arrange the fixed work cradle 22 and the movable work cradle 24 except for the wheel portion 10b. There is a need to. Therefore, with respect to the movable work cradle 24, the handle 84 is turned in advance so as to support the predetermined shaft portion 10a on the opposite side of the base work cradle 26, 28 with respect to the fixed work cradle 22 in advance. The distance to the cradle 22 is adjusted. The fixed work cradle 22 and the movable work cradle 24 are lowered in height by loosening bolts 98 and 121 in advance. Now the preparation for setting the workpiece 10 is completed. When ready, the wire ropes 149 and 149 are hung on the shaft portions 10a at both ends of the workpiece 10 stored nearby, and the workpiece 10 is lifted by the crane 151 installed at the storage location.

<Process (2) (work set): FIG. 10A (2)>
The position of the workpiece 10 lifted by the crane 151 is adjusted so that the first cutting point is at the center in the short direction of the upper surface of the fixed workpiece cradle 22, and is lowered horizontally on the work cradle 26, 28 on the foundation. Since the first cutting cuts the shaft portion 10a just outside the outermost wheel portion 10b at one end of the workpiece 10, this cutting position is located at the center in the short direction of the upper surface of the fixed workpiece receiving base 22. Like that. At this time, the positions of the base work supports 26 and 28 are adjusted in advance so that the position of the center of gravity of the work 10 in the direction of the center axis X is between the base work supports 26 and 28. The cradles 26 and 28 can support the workpiece 10 independently. Further, since the V-shaped groove 153 is formed on the upper surfaces of the work supports 26 and 28 on the foundation as shown in FIG. 1B, the work supports 26 and 28 on the foundation stabilize the shaft portion 10a of the work 10. Can be supported. At this time, since the fixed work cradle 22 and the movable work cradle 24 do not support the work 10 yet, the direction of the central axis X of the work 10 is within a range where the mobile work cradle 24 does not hit the wheel portion 10b. Can be finely adjusted. Next, the hydraulic cylinder 102 of the fixed work cradle 22 (FIG. 7) is driven to abut the receiving member 100 against the work 10, and the bolt 98 is tightened to support the shaft 100 at the cutting position of the work 10 on the support surface 100a of the receiving member 100. 10a is supported. Similarly, the hydraulic cylinder 127 of the movable workpiece cradle 24 (FIG. 8) is driven to abut the receiving member 125 against the workpiece 10, and the bolt 121 is tightened to support the other shaft portion of the workpiece 10 on the support surface 125a of the receiving member 125. 10a (the shaft portion 10a opposite to the shaft portion 10a supported by the work support bases 26 and 28 on the foundation across the shaft portion 10a at the cutting position) is supported. Thereby, even if the diameter of the shaft portion 10a varies depending on the position of the workpiece 10 in the direction of the central axis X, each workpiece cradle 22, 24, 26 is always in a horizontal posture with a constant height. 28, the workpiece 10 can be supported and cut. Bolts 98 and 121 of the fixed work cradle 22 and the movable work cradle 24 are placed on the inspection rack 86 (FIG. 6) of the work loading table 66 by an operator, and a tool is inserted from the gap between the wheel part 10b. Can be plugged in and operated. With respect to the movable work cradle 24, after the work 10 is supported by the receiving member 125, a pair of shaft sheet piles 126 (FIG. 8) are provided on the upper surface 125a of the receiving member 125 by the operator to prevent the cut product from rolling. It is mounted and abutted against the lower part of the shaft portion 10a of the workpiece 10 from both sides. In addition, after the workpiece 10 is supported by the receiving member 125, the sheet pile mounting positions 73 and 75 (FIG. 6) between the fixed workpiece receiving base 70 and the movable workpiece receiving base 72 on the workpiece loading table 66 are cut. In order to prevent the product from rolling, a pair of wedge-shaped sheet piles 128 and 128 (FIGS. 1 and 2) are placed by an operator and abut against the lower portion of the wheel portion 10b of the workpiece 10 from both sides. Since the fixed work cradle 22 is a place for cutting, a sheet pile is not arranged.

<< Process (3) (band saw position set): Fig. 10A (3) >>
With the band saw device 20 retracted to the upper position, the band saw support structure 18 is moved on the band saw moving base 16 so that the saw blade 139 of the band saw device 20 is in a position to be cut (the groove portion 108 (see FIG. Position it so that it is at the position directly above 7). In the state where the band saw device 20 is retracted to the upper position, the band saw device 20 can be moved to the cutting position by moving the band saw support structure 18 without bringing the saw blade 139 into contact with the wheel portion 10b of the workpiece 10. .

<< Step (4) (Cut): Fig. 10B (4) >>
The saw blade 139 of the band saw device 20 is rotationally driven, and the band saw device 20 is lowered while the cutting fluid is applied to the blade guides 145 and 147 located on the workpiece entrance side as mist or directly, and one end of the workpiece 10 is moved. The part is cut in a ring shape perpendicular to the central axis X of the workpiece 10. The lowering of the band saw device 20 stops at a position where the saw blade 139 enters the groove portion 108 (FIG. 7) of the fixed work cradle 22. When the cutting of the workpiece 10 is completed, the saw blade 139 is stopped from rotating, and the band saw device 20 is raised and retracted to the upper position. The cut product 10-1 of the workpiece 10 is maintained in a state where it is horizontally supported by the portion on one side across the groove 108 on the upper surface of the fixed workpiece holder 22 and the movable workpiece holder 24. The remaining product (remaining part) 10-2 of the work 10 is maintained in a state where it is horizontally supported by the work receiving bases 26 and 28 on the foundation. The remaining product 10-2 of the workpiece 10 is continuously supported also on the other side of the upper surface of the fixed workpiece cradle 22 with the groove 108 interposed therebetween.

<< Step (5) (Removal of cut product): Fig. 10B (5) >>
A wire rope 149 is hung on the cut product 10-1, the cut product 10-1 is lifted by the crane 151, moved to a predetermined place, and lowered.

<< Step (6) (Changing the position of the cutting part): Fig. 10B (6) >>
A wire rope 149 is hung on the remaining item 10-2, the remaining item 10-2 is lifted by the crane 151, and the direction is reversed in the horizontal direction.

<Process (7) (work set): FIG. 10C (7)>
When the remaining product 10-2 is lifted by the crane 151, the position of the work cradles 26 and 28 on the foundation and the distance between the fixed work cradle 22 and the movable work cradle 24 are set according to the second cutting position. Readjust. Further, the heights of the fixed work cradle 22 and the movable work cradle 24 are lowered. When these preparations are completed, the position of the remaining product 10-2 lifted by the crane 151 is adjusted so that the second cutting point comes to the position of the fixed work cradle 22, and the work cradles 26 and 28 on the foundation Lower horizontally. Since the second cutting cuts the shaft portion 10a immediately outside the outermost wheel portion 10b at the other end of the workpiece 10-2, the cutting position is set at the position of the fixed workpiece receiving base 22. At this time, by setting the positions of the foundation work supports 26 and 28 so that the position of the center of gravity of the work 10-2 in the direction of the center axis X is between the foundation work supports 26 and 28, the foundation work support The workpieces 10-2 can be independently supported by the stands 26 and 28. After the workpiece 10-2 is supported on the workpiece support bases 26 and 28 on the foundation, the hydraulic cylinder 102 of the fixed workpiece support 22 (FIG. 7) is driven to abut the receiving member 100 against the workpiece 10-2, and the bolt 98 is attached. The shaft 10a at the cutting position of the workpiece 10-2 is supported by the receiving member 100 by tightening. Similarly, the hydraulic cylinder 127 of the movable workpiece cradle 24 (FIG. 8) is driven to abut the receiving member 125 against the workpiece 10-2, and the bolt 121 is tightened to receive the other shaft portion of the workpiece 10-2 with the receiving member 125. 10a is supported. After the workpiece 10-2 is supported by the receiving member 125, a pair of shaft sheet piles 126 (FIG. 8) are mounted on the upper surface of the receiving member 125, and abut against the lower portion of the shaft portion 10a of the workpiece 10-2 from both sides. Further, after supporting the workpiece 10-2 by the receiving member 125, a pair of wheel section sheet piles 128 (FIGS. 1 and 2) are placed on the workpiece loading table 66, and the lower portion of the wheel portion 10b of the workpiece 10-2 is viewed from both sides. Strike.

<Process (8) (band saw position set): FIG. 10C (8)>
The band saw support structure 18 is moved on the band saw moving base 16 to position the band saw device 20 at the cutting position.

<< Step (9) (Cutting): FIG. 10C (9) >>
The saw blade 139 of the band saw device 20 is rotationally driven, and the band saw device 20 is lowered while the cutting fluid is being applied to the cutting portion, and the other end of the workpiece 10-2 is cut into a ring shape. When the cutting of the workpiece 10-2 is finished, the saw blade 139 is stopped from rotating, and the band saw device 20 is raised and retracted to the upper position. The cut product 10-3 of the workpiece 10-2 is maintained in a state where it is horizontally supported by a portion on one side across the groove 108 (FIG. 7) on the upper surface of the fixed workpiece holder 22 and the movable workpiece holder 24. Be drunk. The remaining product 10-4 of the workpiece 10-2 is maintained in a state where it is horizontally supported by the workpiece cradle 26, 28 on the foundation. The remaining product 10-4 of the workpiece 10-2 is continuously supported also on the other side of the fixed workpiece cradle 22 on the other side of the groove 108 therebetween.

<< Step (10) (Movement of cut product): Fig. 10D (10) >>
A wire rope 149 is hung on the cut product 10-3, the cut product 10-3 is lifted by the crane 151, moved to a predetermined place, and lowered.

<< Steps (11) to (19) (Step Repeat): FIG. 10D (11) to FIG. 10F (19)>
Thereafter, lifting, reversing and setting of the remaining product, setting of the position of the band saw device 20, cutting from both ends of the shaft portion 10 a by inserting the saw blade 139 between the wheel portions 10 b and 10 b, and removal of the cut product are performed. Repeat several times. As a result, for example, one rotor shaft 10 having a weight of 120 tons can be divided into lumps of about 5 to 20 tons, and each lumbar is lowered from a storage place by a normal crane and placed on a truck. It can be taken out to a storage location and decontaminated as necessary for recycling. Further, since the direction of the workpiece is reversed for each cutting, the amount of deviation of the center of gravity position of the workpiece 10 from the original center of gravity position (center position in the direction of the central axis X) can be reduced. Therefore, when the work 10 is lifted by the crane 151, the inclination of the work 10 can be suppressed, and the work can be performed safely. In the step (15) (FIG. 10E (15)), two of the wheel portions 10b are cut as one cut product, but can be cut for each wheel portion 10b.

A process for one cycle for performing the n-th cutting shown in FIG. 11 will be described.
<< Step (n1) (preparation of rotor shaft set): Fig. 11A (n1) >>
This is a preparatory step before setting the workpiece 10, similar to the first cutting step (1) (FIG. 10A (1)). Here, the positions of the workpiece supports 26 and 28 on the foundation and the movable workpiece holder 24 (positions in the direction of the central axis X of the workpiece 10) and the heights of the workpiece supports 26 and 28 on the foundation are adjusted. Here, it is assumed that two of the wheel portions 10b are cut as one cut product. The fixed work cradle 22 and the movable work cradle 24 are lowered in height. When the workpiece 10 is ready to be set, the wire rope 149 is hung on both ends in the axial direction of the workpiece 10 (FIG. 11A (1) shows only one end side), and the workpiece 10 is moved to the crane 151 (FIG. 10A (1)). ).

<< Process (n2) (Workset): Fig. 11A (n2) >>
This is a step of setting the workpiece 10 as in the first cutting step (2) (FIG. 10A (2)). The position of the workpiece 10 lifted by the crane 151 is adjusted so that the n-th cutting point is at the center in the short direction of the upper surface of the fixed workpiece cradle 22 and lowered horizontally on the workpiece cradles 26 and 28 on the foundation. . At this time, the positions of the base work supports 26 and 28 are adjusted in advance so that the position of the center of gravity of the work 10 in the direction of the center axis X is between the base work supports 26 and 28. The cradles 26 and 28 can support the workpiece 10 independently. Next, after finely adjusting the position of the movable work cradle 24 as necessary, the support surface 100a of the fixed work cradle 22 (FIG. 7) is lifted by the hydraulic cylinder 102 and abutted against the work 10 and a bolt 98 Is tightened to support the planned cutting portion of the workpiece 10 with the support surface 100a. Similarly, the support surface 125a of the movable work cradle 24 (FIG. 8) is raised by the hydraulic cylinder 127 and abutted against the work 10, the bolt 121 is tightened, and a predetermined support position of the work 10 (work In the direction of the central axis X, the shaft portion 10a) is supported at a position opposite to the support position by the work support bases 26 and 28 on the foundation with respect to the support position by the support surface 100a of the fixed work support base 22. . Further, a pair of shaft sheet piles 126 (FIG. 8) is mounted on the support surface 125a of the receiving member 125 and abutted against the shaft section 10a at that position, and the sheet pile placement locations 73 and 75 (FIG. 6) on the work stacking table 66. ) Is placed against the wheel portion 10b at that position (position between the fixed work receiving base 22 and the movable work receiving base 24). Thus, the cut product is prevented from rolling after the workpiece 10 is cut.

<< Process (n3) (band saw position set): FIG. 11B (n3) >>
This is a step of moving the band saw device 20 to the cutting position, similar to the first cutting step (3) (FIG. 10A (3)). With the band saw device 20 retracted to the upper position, the band saw support structure 18 is moved on the band saw moving base 16 so that the saw blade 139 of the band saw device 20 is in a position to be cut (the groove portion 108 (see FIG. Position it so that it is at the position directly above 7).

<< Step (n4) (Cutting): FIG. 11B (n4) >>
In the same manner as the first cutting step (4) (FIG. 10B (4)), the band saw device 20 is lowered to cut the workpiece 10. The saw blade 139 of the band saw device 20 is driven to rotate, the band saw device 20 is lowered, and the workpiece 10 is cut into a ring shape.

<< Step (n5) (cutting completed): FIG. 11C (n5) >>
This is a step corresponding to the middle of the first cutting step (4) (5) (FIG. 10B (4) (5)). When the cutting of the workpiece 10 is completed, the saw blade 139 is stopped from rotating, and the band saw device 20 is raised and retracted to the upper position. At this time, the cut product 10-n of the workpiece 10 includes a portion on one side (left side in FIG. 11C (n5)) sandwiching the groove 108 (FIG. 7) on the upper surface of the fixed workpiece cradle 22 and the movable workpiece cradle 24. The horizontal support state is maintained. The remaining product 10- (n + 1) of the work 10 is maintained in a state where it is horizontally supported by the work cradles 26 and 28 on the foundation. The remaining product 10- (n + 1) of the workpiece 10 is continuously supported also on the other side (right side in FIG. 11C (n5)) across the groove 108 on the upper surface of the fixed workpiece cradle 22.

<< Step (n6) (Removal of cut product): Fig. 11C (n6) >>
This is the same step as the first cutting step (5) (FIG. 10B (5)) in which the cut product is removed and removed. A wire rope 149 is hung on the cut product 10-n, the cut product 10-n is lifted by the crane 151, moved to a predetermined place, and lowered.

<< Embodiment 2 >>
A second embodiment of the present invention is shown in FIGS. In this embodiment, the movement of the band saw support structure 18 by the band saw moving base 16 in the first embodiment is performed by double-axis driving, but this is changed to be performed by single-axis driving. The same reference numerals are used for portions common to the first embodiment. Only the drive mechanism of the left and right column attachment seats 38L and 38R of the band saw moving base 16 of the first embodiment is changed. FIG. 13 shows the band saw moving base 16 ′ of the abolition processing device (dismantling device) 12 ′ of FIG. 12 in a state of being disassembled into left and right divided bases 16L ′ and 16R ′. The left split base 16L ′ is configured by removing the bevel gear box 36L, the counter shaft 40L, and the bearing 42L of the counter shaft 40L from the left split base 16L of FIG. The right split base 16R ′ is configured by removing the counter shaft 40R, the bearing 42R of the counter shaft 40R, the bevel gear box 36R, and the ball screw 33R from the right split base 16R of FIG. With the left and right divided bases 16L 'and 16R' connected to each other and the band saw support structure 18 fixedly supported on the left and right column mounting seats 38L and 38R, the motor 34L is driven to move the left column mounting seat 38L to move the band saw. When the support structure 18 is moved, the right column support seat 38R is driven by the band saw support structure 18 and is moved at the same position in the direction of the center axis X of the left column support seat 38L and the workpiece 10.

  In the above-described embodiment, the work cradle to be arranged on the shaft portion 10a at the cutting position is configured by one work cradle 22 (FIG. 7), and the groove 108 for removing the saw blade is formed on the upper surface of the receiving member 100. The work cradle to be arranged on the shaft portion 10a at the cutting position is configured by two work cradles separately, both work cradles are arranged with a gap therebetween, and the saw blade 139 can be removed by the gap. You can also In the above-described embodiment, the shaft portion 10a at the cutting position is supported by the work cradle 22. However, it is not essential to support the shaft portion 10a at the cutting position by the work cradle 22, and the shaft portion at the cutting position. A work cradle can also be arranged except 10a.

  DESCRIPTION OF SYMBOLS 10 ... Rotor shaft (workpiece), 10a ... Shaft part of rotor shaft, 10b ... Wheel part of rotor shaft, 10-1, 10-3, 10-5, 10-n, 10-e ... Cut product, 10-2 , 10-4, 10-6, 10- (n + 1), 10- (e-1), 10- (e + 1) ... remaining items, 12, 12 '... abolition processing device (dismantling device), 14 ... basis, 16 , 16 '... Band saw moving base, 16L, 16R, 16L', 16R '... Split base, 18 ... Band saw support structure, 18L ... Left column, 18R ... Right column, 18U ... Upper connecting beam, 18B ... Lower connecting beam, DESCRIPTION OF SYMBOLS 20 ... Band saw apparatus (cutting head unit), 22 ... Fixed work cradle (cutting position work cradle), 24 ... Mobile work cradle (non-cutting position work cradle), 26, 28 ... Work cradle on foundation , 66 ... Work loading tray 68a, 68b, 68c, 68d ... work loading table legs, 69 ... space formed between the work loading table and the band saw moving base, 100a ... support surface of the fixed work cradle, 108 ... groove, 125a ... support surface of movable work cradle, 126, 126 ... pair of sheet piles, 139 ... saw blade, 151 ... crane, X ... central axis of rotor shaft.

Claims (20)

Band saw moving base supported on the foundation,
A band saw support structure which is supported by the band saw moving base so as to be movable in the horizontal direction;
A band saw device supported by the band saw support structure so as to be movable up and down;
A work receiver that supports the rotor shaft on the foundation at a plurality of shaft portions in the direction of the central axis of the rotor shaft so that the rotor shaft of the power generation steam turbine is cut into a ring shape by the descending band saw device. Decommissioning equipment comprising a stand. The band saw support structure is movable on the band saw moving base to a position where the band saw device is retracted to the outside of the rotor shaft supported by the work cradle;
The workpiece cradle has at least two shaft portions opposite to a direction in which the band saw support structure is retracted in a direction of a central axis of the rotor shaft with respect to a shaft portion at a cutting position of the rotor shaft. The abolition processing apparatus according to claim 1, further comprising a work cradle that independently supports the cradle.   The abolition processing apparatus according to claim 2, wherein the work cradle that supports the rotor shaft independently is a work cradle that supports the rotor shaft independently on the foundation without the band saw moving base.   4. The abolition according to claim 1, wherein the work cradle includes a cutting position work cradle that is supported by the band saw moving base and supports a shaft portion immediately below a saw blade of the band saw device. Processing equipment.   The abolition processing apparatus according to claim 4, wherein a groove portion for removing the saw blade is formed on the upper surface of the cutting position work cradle. The work cradle further includes a non-cutting position work cradle that is supported by the band saw moving base and supports a shaft portion other than a position directly below the saw blade of the band saw device,
The abolition process according to claim 4 or 5, wherein the cutting position work cradle and the non-cutting position work cradle are supported on the band saw moving base so as to be close to and away from each other in the direction of the central axis of the rotor shaft. apparatus.   7. The abolition processing apparatus according to claim 4, wherein the work cradle supported by the band saw moving base includes a work cradle whose support surface can be moved up and down. A work loading table supported by legs on the band saw moving base;
The work cradle supported by the band saw movement base includes a work cradle supported by the band saw movement base via the work loading table,
The band saw support structure has a frame type structure in which a left column, a right column, an upper connecting beam, and a lower connecting beam are connected to each other,
The lower connecting beam is disposed in a space formed between the work loading table supported by the legs on the band saw moving base and the band saw moving base,
The abolition processing apparatus according to any one of claims 4 to 7, wherein the lower connection beam moves in the space when the band saw support structure moves on the band saw moving base. The work cradle supported by the band saw moving base includes a work cradle having a flat horizontal upper surface that supports the rotor shaft,
On the horizontal surface of the work cradle, a pair of sheet piles that prevent rolling of the cut rotor shaft is disposed on both sides of the central axis of the rotor shaft, and the pair of sheet piles is orthogonal to the central axis of the rotor shaft. The abolishment processing apparatus according to any one of claims 4 to 8, wherein the abolition processing apparatus is supported by the horizontal plane so as to be slidable in a moving direction.   The abandonment processing apparatus according to any one of claims 1 to 9, wherein the band saw moving base has a structure that can be divided at a division position parallel to a central axis of the rotor shaft.   A power plant that is configured to disassemble and assemble the abolition processing device according to any one of claims 1 to 10 and disassemble the discontinuation processing device into a plurality of parts in a state of being divided into a plurality of parts. Assemble the decommissioning device at the place where cutting of the turbine shaft that has been used and cut the rotor shaft and perform the cutting process of the rotor shaft. After finishing the cutting process, disassemble the decommissioning device and load it on multiple vehicles. And abolishing processing method to carry out from the power plant.   A method for abolishing a rotor shaft, wherein a rotor shaft of a steam turbine for power generation is disassembled by cutting the rotor shaft into a ring shape using a band saw device at a position of a shaft portion that is disengaged from the wheel portion of the rotor shaft.   The rotor shaft is supported on the foundation, the band saw device is arranged on the foundation so as to be movable in the direction of the central axis of the rotor shaft with respect to the rotor shaft, and the band saw device is moved to the shaft portion at the cutting position. The method according to claim 12, wherein the cutting is performed.   The rotor shaft is lifted by a crane and supported on the foundation in a state where the band saw device is retracted from the cutting position in the direction of the central axis of the rotor shaft, and then the band saw device is supported on the central axis of the rotor shaft. The method according to claim 13, wherein the cutting is performed at a shaft portion at the cutting position.   The method according to any one of claims 12 to 14, wherein the cutting is performed by supporting the rotor shaft at a plurality of shaft portions on the foundation via a work cradle.   The work cradle includes a work cradle that supports the rotor shaft at a shaft portion at the cutting position, and the work cradle supported at the shaft portion at the cutting position is a center of the rotor shaft across the cutting position. The method according to claim 15, wherein the shaft portion of the cutting position is supported on both sides in the axial direction.   17. The work cradle includes a work cradle that supports the rotor shaft at a plurality of shaft portions on both sides in the direction of the central axis of the rotor shaft across the cutting position. Method.   The work cradle includes a base work cradle for supporting the rotor shaft on the foundation by at least two shaft portions closer to one end side in the direction of the central axis than the shaft portion of the cutting position. Item 18. The method according to any one of Items 15 to 17.   The method according to any one of claims 12 to 18, wherein the cutting is performed with a rotor blade being removed from the rotor shaft.   The rotor shaft has a structure in which a plurality of wheel portions are arranged symmetrically with respect to a central position in the direction of the central axis of the rotor shaft, and the rotor shaft is supported on the foundation and is provided on one end side shaft. 21. The shaft portion on the other end side is cut off by cutting the portion, and then lifting the remaining portion of the rotor shaft with a crane, turning it left and right and supporting it on the foundation. The method described in one.

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