JP5001913B2 - Core block lifting method and core block lifting device - Google Patents

Description

  The present invention relates to a method for lifting a core block of a large-sized rotating electrical machine such as a turbine generator and a core block lifting device.

  FIG. 4 is a side cross-sectional view schematically illustrating a stator core stacking operation using a conventional stator core stacking apparatus for a large rotating electric machine. As shown in FIG. 4, the stator core stacking operation in the stator core stacking facility of the large rotating electric machine is fan-shaped from the bottom to the top along the core bolt 10 fixed to the inner periphery of the stator frame member 9. A large number of stator cored plates 11 made of thin steel plates are sequentially laminated. Specifically, a large number of pre-stacked stator core-cutting plates 12 made of fan-shaped thin steel plates are suspended by a crane, and the suspended pre-stacked stator core-cutting plates 12 are core-stacked workers. 13 are sequentially laminated along the core bolt 10 from the bottom to the top manually.

Japanese Patent Laid-Open No. 60-16154 (FIG. 6 and explanation thereof) JP 2002-171726 A (FIG. 8 and its description)

  The conventional stator core stacking operation as described above is performed as a rotating electric machine stator core assembling operation, and the core stacker 13 manually stacks tens of thousands of stator core punching plates 12 one by one. There was a problem that the heavy work of assembling the stator core was done, and it was placed in a harsh working environment.

  The present invention has been made in view of the above-described circumstances, and a core block lifting method and a core block lifting method capable of assembling a stator core by lifting an automatically stacked core block and moving it to an assembly location. The object is to provide an apparatus.

  In the method of lifting the core block according to the present invention, the core block in which the cored plates provided with three or more through bolt holes are stacked is horizontally arranged so that a predetermined space is formed around the through bolt holes on the bottom side. A step of placing a core block lifting jig having a rod-shaped portion and a tongue-shaped portion provided at one end of the rod-shaped portion so as to be substantially orthogonal to the rod-shaped portion; A step of inserting from above, the core block lifting jig inserted into the through bolt hole is moved horizontally so that the tongue-shaped portion enters the space and the tongue-shaped portion engages with the bottom surface of the core block. Step, all the cores in a state where the tongue portions of all the core block lifting jigs inserted into the through bolt holes are engaged with the bottom surfaces of the core blocks And it has a step of lifting the core block by moving the lock lifting jig upwards.

  The core block lifting device according to the present invention is a core block lifting device for lifting a core block in which cored plates with three or more through-bolt holes are stacked, and is attached to one end of the rod-shaped portion and the rod-shaped portion. The same number of core block lifting jigs as the through-bolt holes having tongue-shaped portions provided so as to be substantially orthogonal to the rod-shaped portions, and the ends of the core block lifting jigs without the tongue-shaped portions are the tongue-shaped portions And a disk-shaped base plate that is vertically attached to a position corresponding to the through bolt hole so that the portion faces the same side in the circumferential direction.

  The present invention includes a step of horizontally placing a core block in which cored plates provided with three or more through bolt holes are laminated so that a predetermined space is formed around the through bolt holes on the bottom side, Inserting a core block lifting jig having a tongue-shaped portion provided at one end of the rod-shaped portion so as to be substantially orthogonal to the rod-shaped portion from above into the through-bolt hole so that the tongue-shaped portion faces down, A step of horizontally moving the core block lifting jig inserted into the through-bolt hole so that the tongue-shaped portion enters the space and the tongue-shaped portion engages the bottom surface of the core block; Move all the core block lifting jigs upward with the tongues of all the inserted core block lifting jigs engaged with the bottom surface of the core block. Since it has the step of lifting the core block by causing an effect that can be assembled stator core is moved to the assembly site by lifting the automatic loading the core block.

  Further, the present invention is a core block lifting device for lifting a core block in which cored plates provided with three or more through bolt holes are stacked, and is substantially orthogonal to the rod-shaped portion and one end of the rod-shaped portion. The same number of core block lifting jigs as the through-bolt holes having tongue-shaped portions provided to the end, and the ends of the core block lifting jigs without the tongue-shaped portions are the same in the circumferential direction of the tongue-shaped portions Since it has a disk-like base plate attached to the position corresponding to the through-bolt hole vertically and facing the side, the automatically stacked core block is lifted and moved to the assembly location to assemble the stator core There is an effect that can.

Embodiment 1 FIG.
A first embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a perspective view schematically illustrating the concept of a stator core block lifting method. The first embodiment uses a through bolt hole provided in a core back portion of a stator core, and a stator core in which a core block in which stator core punching plates are stacked in a block shape is lifted by a core block lifting jig A lifting method and a lifting device are illustrated. Further, in the first embodiment, the stator core is stacked by using a stator core automatic stacking apparatus that is introduced in order to abolish manual stator core stacking work and realize automatic stacking. Core block lifting method and lifting device using a core block lifting jig for lifting and transporting the core block to the stator core assembly work place using the through bolt hole of the stator core punching plate Is to provide.

  In FIG. 1, a core block 1 is a known stator core automatic stacking device (illustrated) with a stator core punching plate having three or more through bolt holes 2 drilled at equal intervals along the circumference. (Not shown) is a stator core punched plate laminate that is laminated a predetermined number of times. The through bolt holes 2 of each stator core punching plate constituting the core block 1 are superposed to form a continuous through bolt hole 2 penetrating from the upper surface to the lower surface of the core block 1. A series of through bolt holes 2 penetrating from the upper surface to the lower surface of the core block 1 are present in a plurality of three or more at equal intervals along the circumference of the core block 1.

  The core block lifting jig 3 is inserted into each of the three or more through bolt holes 2 at a predetermined interval of the core block 1.

  As shown in the figure, the core block lifting jig 3 inserted through each of the through-bolt holes has a rod-shaped portion 31 and the rod-shaped portion 31 integrated with the rod-shaped portion 31 at the tip of the rod-shaped portion 31 and substantially orthogonal to the rod-shaped portion 31. It is the L-shaped jig | tool which consists of the tongue-shaped part 32 provided so that it might do.

  The length of the rod-shaped portion 31 of each jig 3 is longer than the length of the through bolt hole 2 of the core block 1. Further, the surface of at least the inner peripheral wall of the through-bolt hole 2 of the rod-shaped portion 31 of each jig 3 is a curved surface, so that even when the rod-shaped portion 31 contacts the inner peripheral wall of the corresponding through-bolt hole 2 The inner wall is made difficult to damage.

  The three or more core block lifting jigs 3 are the jigs for lifting the core block 1 together by holding the mass of the core block 1 together with the tongue portions 32.

  In the stator core stacking operation using the conventional stator core stacking apparatus shown in FIG. 4, tens of thousands of stator core punching plates 11 are stacked manually by the core stacker 13, The worker 13 was doing heavy muscle work.

  In order to solve such a problem, in FIG. 1, through bolt holes 2 of the core blocks 1 stacked by using an automatic core stacking device (not shown) (the stacked core blocks 1 are connected to the end of the stator frame). The core block lifting jig 3 in each of the three or more through bolt holes 2 positioned at equal intervals so as to receive the mass of the core block 1 evenly by using the bolts to be bolted to the plate) Is inserted, and the tongue portion 32 at the tip of the core block lifting jig 3 is provided with a space portion 8g between the duct pieces 8 (shown in FIG. 2) radially provided on the bottom surface of the lowermost layer of the core block 1. 2), each core block lifting jig 3 is simultaneously lifted upward to lift the core lock 1 and automatically transport it to the stator core assembly site with a crane or the like. In stator core assembly location, it lowers the jig 3 lifting each core block simultaneously downward, automation of a series of operations to stack the core block 1 in the frame of the stator is possible. The core block stacking method using the stator core automatic stacking device can be realized, and the operator can be released from the heavy work.

  In the first embodiment, as described above, a steel plate provided with through-bolt insertion holes for tightening the stator core in the axial direction in the core back portion, a core block in which steel plates are stacked in a block shape, and fixed in the core block A duct block provided at a position in the stacking direction of the stator core for cooling the child core, and an L-shaped core block lifting jig having a tongue-shaped portion at the tip and capable of holding the core block mass, A jig block is inserted into the through-bolt hole of the core block, and the tip tongue of the core block lifting jig is hooked into the gap between the duct pieces located at the bottom layer of the core block, and the core block is automatically stacked. The stator core can be assembled by moving to the assembly location.

  In the first embodiment, from a different point of view, an L-shaped core block lifting jig composed of a rod-shaped portion and a tongue-shaped portion is provided in each of three or more equally spaced through-bolt holes of a horizontal core block. Each core block lifting jig is inserted in a state where the core block lifting jig is moved in the horizontal direction after insertion and the tongue-shaped portion of each core block lifting jig is engaged with the bottom surface of the core block. The core block lifting method and the core block lifting device are capable of assembling the stator core by lifting the automatically stacked core blocks and moving them to the assembly location.

  More specifically, in the first embodiment, a predetermined space is formed around the through-bolt hole on the bottom side of the core block in which the cored plates provided with three or more through-bolt holes are stacked. A step of placing horizontally, a core block lifting jig having a rod-shaped portion and a tongue-shaped portion provided at one end of the rod-shaped portion so as to be substantially orthogonal to the rod-shaped portion; Inserting the core block lifting jig inserted into the through-bolt hole in a horizontal direction so that the tongue-shaped portion enters the space and the tongue-shaped portion engages with the bottom surface of the core block; A step of moving all the core blocks in a state in which the tongue portions of the core block lifting jigs inserted into all the through bolt holes engage with the bottom surfaces of the core blocks. A method lifting the core block having a step of lifting the core block by moving the lifting jig upwards.

  Further, the first embodiment is a core block lifting device for lifting a core block in which cored plates provided with three or more through bolt holes are stacked, and the rod-like portion is attached to one end of the rod-like portion. The same number of core block lifting jigs as the through-bolt holes having tongue-shaped portions provided so as to be substantially orthogonal to each other, and the ends of the core block lifting jigs without the tongue-shaped portions are the circumferences of the tongue-shaped portions. It is a core block lifting device provided with a disk-shaped base plate attached to a position corresponding to the through bolt hole so as to face the same side of the direction and vertically.

Embodiment 2. FIG.
A second embodiment of the present invention will be described below with reference to FIG. FIG. 2 is a side view showing a specific example of a main part of the method for lifting the block of the stator core in a partial cross section. The second embodiment also uses a through bolt hole provided in the core back portion of the stator core to lift the core block in which the stator core punching plates are stacked in a block shape using a core block lifting jig. The lifting method and the lifting device are shown as an example, and the core blocks stacked by using the automatic stator core stacking device introduced in order to eliminate the manual stator core stacking operation and realize automatic stacking are sequentially Core block using a core block lifting jig to lift and transport the core block to the stator core assembly work place using the through bolt holes of the stator core punching plate to assemble the stator core by stacking A lifting method and a lifting device are provided. In the second embodiment, when the core block of the stator core is lifted, the core block lifting jig moves in the through bolt hole and cannot hold the core block, and the core block is displaced. In order to suppress, a guide having a cylindrical cross section is installed between the core block lifting jig and the core block, and the core block is the tongue block at the tip of the core block lifting jig. When the bottom of the core is suspended, the guide of the cylindrical cross section is brought into contact with the through bolt hole, thereby making it possible to suppress unevenness (unevenness) of the stator core due to the shift of the core block.

  FIG. 2 is a cross-sectional view of one of the core block lifting jigs 3 of FIG.

In FIG. 2, a cylindrical guide 5 surrounding the periphery of the rod-shaped portion 31 of the core block lifting jig 3 is fixed to the lifting jig fixing base plate 6 at the upper part of the core block 1 via the core block lifting jig 3. ing. A male screw 311 is formed at the upper end portion (the end portion opposite to the tongue-shaped portion 32) of the rod-shaped portion 31 of the core block lifting jig 3, and a pair of upper and lower nuts that are screwed into the male screw (screw connector) 311 ( The core block lifting jig 3 is fixed to the lifting jig fixing base plate 6 by screws 71, 72, and the cylindrical guide 5 is also interposed between the lower nut 72 and the tongue portion 32 by the fixing. It is fixed in a state of interposing and surrounding the rod-shaped portion 31.
Note that the lower nut 72 is not necessarily a nut (screw), and may be a flange, a boss, or the like that is integral with the rod-shaped portion 31.

  The length of the bottom surface of the tongue-shaped portion 32 of each jig 3 is shorter than the diameter of the through bolt hole 2. Further, the thickness t1 of the tongue-shaped portion 32 of each jig 3 is the thickness t2 of a plurality of duct pieces (spacing pieces) 8 provided in a radial direction facing the bottom surface 100 of the lowermost layer of the core block 1. It is thinner. That is, the magnitude relationship between the thickness t1 of the tongue-shaped portion 32 and the thickness t2 of the duct piece 8 is t1 <t2.

  The configurations described in the preceding paragraphs [0024] and [0025] are common to all of the three or more core block lifting jigs 3 illustrated in FIG.

  Through-bolt holes 2 of core blocks 1 stacked using an automatic core stacking device (not shown) (holes through which bolts for bolting a plurality of stacked core blocks 1 to end plates of a stator frame) are inserted. The core block lifting jig 3 is inserted into each of the three or more through bolt holes 2 positioned at equal intervals so as to receive the mass of the core block 1 evenly. And the tongue-shaped portion 32 at the front end of the core block 1 is hooked on the bottom surface 100 in a space portion 8g between a plurality of duct pieces (space pieces) 8 that are radially provided facing the bottom surface 100 of the lowermost layer of the core block 1. By lifting the core block lifting jig 3 upward, the core block 1 is lifted and automatically transported to the stator core assembly site by a crane or the like. A block lowers the lifting jig 3 at the same time downward, automation of a series of operations to stack the core block 1 in the frame of the stator is possible.

  When the core block 1 is lifted by hooking the tongue-shaped portion 32 at the tip of the core block lifting jig 3, the cylindrical outer peripheral surface 51 of the cylindrical guide 5 is brought into contact with the peripheral surface 21 of the through bolt hole 2. By fixing the cylindrical guide 5 with the lifting jig base plate 6 at the top of the core, unevenness of the stator cores due to the displacement of the plurality of stator core punching plates stacked in a layer forming the core block 1 (unevenness) ) Can be realized.

  In the second embodiment, as described above, a steel plate provided with through-bolt insertion holes for tightening the stator core in the axial direction in the core back portion, a core block in which steel plates are stacked in a block shape, and fixed in the core block A core stacking apparatus comprising a duct piece provided at a position in the stacking direction of the stator core for cooling the child core, and an L-shaped core block lifting jig having a tongue-shaped portion at the tip and capable of holding the mass of the core block The core block lifting jig is inserted into the through-bolt hole of the core block, and the tip tongue portion of the core block lifting jig is hooked into the gap of the duct piece part located at the lowermost layer of the core block to lift the core block. A stator core lifting device, a stator core lifting device, and a stator core core block To prevent the core block lifting jig from moving in the through-bolt holes and holding the core block when it is lifted, the stator core is not aligned due to the core block displacement. A core block lifting method and a core block lifting device in which a guide having a cylindrical cross section is installed between the core block and the core block.

  In the second embodiment, from a different point of view, an L-shaped core block lifting jig composed of a rod-shaped part and a tongue-shaped part is provided in each of three or more equally spaced through-bolt holes of the horizontal core block. Each core block lifting jig is inserted in a state where the core block lifting jig is moved in the horizontal direction after insertion and the tongue-shaped portion of each core block lifting jig is engaged with the bottom surface of the core block. In the stator core lifting method of a rotating electric machine that lifts the core block by moving the core block upward, each of the core block lifting jigs is provided with a cylindrical guide surrounding the rod-shaped portion, and the core The core block of the rotating electrical machine is configured so that the outer peripheral surface of the cylindrical guide is in contact with the peripheral wall surface of the through bolt hole by moving the block lifting jig in the horizontal direction. Ri is up method.

  Specifically, in the second embodiment, the core block in which the cored plates provided with three or more through bolt holes are stacked is horizontal so that a predetermined space is formed around the through bolt holes on the bottom side. A core block lifting jig having a rod-shaped portion and a tongue-shaped portion provided at one end of the rod-shaped portion so as to be substantially orthogonal to the rod-shaped portion so that the tongue-shaped portion faces down The core block lifting jig inserted into the through bolt hole is moved horizontally so that the tongue-shaped portion enters the space and the tongue-shaped portion engages with the bottom surface of the core block. A step of lifting all the core block suspensions in a state in which the tongue portions of the core block lifting jigs inserted into all the through bolt holes engage with the bottom surfaces of the core block. In the method of lifting the core block, the method including lifting the core block by moving the lifting jig upward, the core block lifting jig includes a cylindrical guide surrounding the rod-shaped portion, and the core block lifting In this method, the core block is lifted so that the outer peripheral surface of the cylindrical guide is in contact with the peripheral wall surface of the through bolt hole in the step of moving the jig in the horizontal direction.

Embodiment 3 FIG.
A third embodiment of the present invention will be described below with reference to FIG. FIG. 3 is a perspective view schematically illustrating another concept of the stator core block lifting method. The third embodiment also uses a through-bolt hole provided in the core back portion of the stator core to suspend the core block in which the stator core punching plates are stacked in a block shape using a core block lifting jig. The lifting method and the lifting device are shown as an example, and the core blocks stacked by using the automatic stator core stacking device introduced in order to eliminate the manual stator core stacking operation and realize automatic stacking are sequentially Core block using a core block lifting jig to lift and transport the core block to the stator core assembly work place using the through bolt holes of the stator core punching plate to assemble the stator core by stacking A lifting method and a lifting device are provided. In the third embodiment, a plurality of core block lifting jigs are arranged in a circumferential direction on a disk-shaped base plate, and the core block lifting jig is inserted into a through bolt hole of the core block. Is rotated in the circumferential direction, and a plurality of core block lifting jigs arranged in the circumferential direction are hooked and attached to the core block at a time.

  In FIG. 3, the core block lifting jigs 3 are attached to the disc-shaped base plate 6 at the same positions as the through bolt holes 2 of the core block 1 at intervals in the circumferential direction.

  Each core block lifting jig 3 attached to the lower surface of the disk-shaped base plate 6 is passed through the corresponding through bolt hole 2 of the core block 1, and the disk-shaped base plate 6 is rotated in the circumferential direction to lift each core block. The core block 1 is lifted by the core block lifting jig 3 by hooking each tongue-shaped portion 32 at the tip of the jig 3 to the bottom surface 100 of the core block 1.

  For example, in FIG. 3, each tongue shape at the tip of three or more core block lifting jigs 3 attached to the disk-shaped base plate 6 is obtained by rotating the disk-shaped base plate 6 clockwise in the circumferential direction. 32 is caught at a time on the bottom surface 100 of the core block 1, and the core block 1 can be lifted in this state. When removing the three or more core block lifting jigs 3 from the core block 1, the disk-shaped base plate 6 is rotated counterclockwise in the circumferential direction in FIG. The jigs 3 can be removed at a time, and the workability of attaching and removing the core block lifting jig 3 to / from the core block 1 is improved.

  In the third embodiment, as described above, the steel plate provided with through-bolt insertion holes for tightening the stator core in the axial direction in the core back portion, the core block in which the steel plates are stacked in a block shape, and fixed in the core block A duct block provided at a position in the stacking direction of the stator core for cooling the child core, and an L-shaped core block lifting jig having a tongue-shaped portion at the tip and capable of holding the core block mass, Core that transports the core block by inserting the jig into the through-bolt hole of the core block and hooking the tongue-shaped part at the tip of the core block lifting jig into the gap of the duct piece part located at the bottom layer of the core block A block lifting method and a core block lifting device, and further, a plurality of core block suspensions in a circumferential direction on a disk-shaped base plate Place the lifting jig, point the tongue of the lifting jig in the same direction in the circumferential direction, and insert the core block lifting jig into the through bolt hole of the core block. The core block lifting method and the core block, wherein the tip tongue portions of a plurality of core block lifting jigs arranged in the circumferential direction are collectively hooked and attached to the core block It is a lifting device.

  In the third embodiment, from a different point of view, an L-shaped core block lifting jig composed of a rod-shaped portion and a tongue-shaped portion is provided in each of three or more equally-spaced through bolt holes of the horizontal core block. Each core block lifting jig is inserted in a state where the core block lifting jig is moved in the horizontal direction after insertion and the tongue-shaped portion of each core block lifting jig is engaged with the bottom surface of the core block. In the method of lifting a core block of a rotating electrical machine that lifts the core block by moving the core block upward, each of the core block lifting jigs is attached to a common disk-shaped base plate, and the disk-shaped base plate is rotated in the circumferential direction. It is a method for lifting a core block of a rotating electric machine that engages the tongue-shaped portion of each core block lifting jig with the bottom surface of the core block by moving. .

  Further, from a different viewpoint, the core block lifting method and the core block lifting device of the rotating electric machine according to the third embodiment are attached to the disc-shaped base plate and the disc-shaped base plate at three or more equal intervals. Since it is provided with an L-shaped core block lifting jig having a tongue-shaped portion at the tip portion, a rod-shaped portion and a tongue-shaped portion are provided in each of three or more equally spaced through bolt holes of the horizontal core block. The L-shaped core block lifting jig is inserted, and after the insertion, each core block lifting jig is moved in the horizontal direction so that the tongue-shaped portion of each core block lifting jig is engaged with the bottom surface of the core block. By moving each core block lifting jig upward in the combined state, the automatically stacked core blocks can be lifted and moved to the assembly location to assemble the stator core It is kill things.

  Specifically, in the third embodiment, a predetermined space is formed around the through-bolt hole on the bottom side of the core block in which the cored plates provided with three or more through-bolt holes are stacked. A core block lifting jig having a rod-shaped portion and a tongue-shaped portion provided at one end of the rod-shaped portion so as to be substantially orthogonal to the rod-shaped portion; A step of inserting the bolt into the bolt hole from above, the core block lifting jig inserted into the through bolt hole so that the tongue-shaped portion enters the space and engages the bottom surface of the core block in the horizontal direction; And moving all the core blocks in a state where the tongue-shaped portions of the core block lifting jigs inserted into all the through bolt holes engage with the bottom surfaces of the core blocks. In the method of lifting the core block, including the step of lifting the core block by moving the hook lifting jig upward, the end of the core block lifting jig without the tongue-shaped portion is the through bolt hole of the disk-shaped platen The tongue-shaped part is attached perpendicularly to the position corresponding to the same direction in the circumferential direction, and the disk-like base plate is rotated in the circumferential direction by moving the core block lifting jig in the horizontal direction. This is a method of lifting the core block.

  Specifically, in the third embodiment, a predetermined space is formed around the through-bolt hole on the bottom side of the core block in which the cored plates provided with three or more through-bolt holes are stacked. A core block lifting jig having a rod-shaped portion and a tongue-shaped portion provided at one end of the rod-shaped portion so as to be substantially orthogonal to the rod-shaped portion; A step of inserting the bolt into the bolt hole from above, the core block lifting jig inserted into the through bolt hole so that the tongue-shaped portion enters the space and engages the bottom surface of the core block in the horizontal direction; And moving all the core blocks in a state where the tongue-shaped portions of the core block lifting jigs inserted into all the through bolt holes engage with the bottom surfaces of the core blocks. In the method of lifting the core block, including the step of lifting the core block by moving the hook lifting jig upward, the core block lifting jig has a cylindrical guide surrounding the rod-shaped portion, and the core block In the step of moving the lifting jig in the horizontal direction, the outer peripheral surface of the cylindrical guide is in contact with the peripheral wall surface of the through-bolt hole, and the end of the core block lifting jig without the tongue-shaped portion is a disc-shaped base. The disc-shaped base plate is mounted in the step of moving the core block lifting jig in a horizontal direction so that the tongue-shaped portion is vertically attached to a position corresponding to the through bolt hole of the plate so as to face the same side in the circumferential direction. Is a method of lifting the core block that rotates in the circumferential direction.

  In addition, in each figure, the same code | symbol shows the same or an equivalent part.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows Embodiment 1 of this invention, and is a perspective view which illustrates typically the concept of the core block lifting method and core block lifting apparatus of a large sized rotary electric machine. It is a figure which shows Embodiment 2 of this invention, and is a side view which shows the specific example of the principal part of the core block lifting method of a large sized rotary electric machine, and a core block lifting apparatus in a partial cross section. It is a figure which shows Embodiment 3 of this invention, and is a perspective view which illustrates typically the other concept of the core block lifting method and core block lifting apparatus of a large sized rotary electric machine. It is a conceptual diagram of the stator core stacking method using the stator core stacking apparatus of the conventional rotary electric machine.

Explanation of symbols

1 core block,
The bottom of the 100 core block,
2 Through bolt holes,
21 The circumference of the through bolt hole,
3 Core block lifting jig,
31 Rod-shaped part of core block lifting jig,
311 male screw,
32 tongue-shaped part at the tip of the lifting jig,
5 Cylindrical guide,
51 cylindrical outer peripheral surface of a cylindrical guide,
6 Base plate for fixing the lifting jig (disc-shaped base plate),
711, 712 nut (screw),
8 Duct piece,
8g Space between duct pieces,
9 Stator frame,
10 core bolts,
11 Stator cored plate,
12 Stator cored plate before lamination,
13 Core stacker.

Claims (4)

  A step of horizontally placing a core block in which a cored plate provided with three or more through bolt holes is laminated so as to form a predetermined space around the through bolt hole on the bottom side, a rod-shaped portion and one end of the rod-shaped portion; A step of inserting a core block lifting jig having a tongue-shaped portion provided so as to be substantially orthogonal to the rod-shaped portion from above into the through-bolt hole so that the tongue-shaped portion is at the bottom; A step of horizontally moving the core block lifting jig inserted into the through bolt hole so that the shape part enters and the tongue part engages with the bottom surface of the core block, all inserted into the through bolt hole All the core block lifting jigs are moved upward in a state where the tongue-shaped portion of the core block lifting jig is engaged with the bottom surface of the core block. METHOD lifting core block having a step of lifting the core block Ri.   The core block lifting method according to claim 1, wherein the core block lifting jig has a cylindrical guide surrounding the rod-shaped portion, and the cylinder block lifting jig is moved in a horizontal direction. A method of lifting a core block, characterized in that the outer peripheral surface of the guide is in contact with the peripheral wall surface of the through bolt hole.   The core block lifting method according to claim 1 or 2, wherein an end of the core block lifting jig without the tongue-shaped portion is perpendicular to a position corresponding to the through bolt hole of the disk-shaped platen. The core block is mounted so that the shape portion faces the same side in the circumferential direction, and the disk-shaped base plate is rotated in the circumferential direction in the step of moving the core block lifting jig in the horizontal direction. Lifting method. A core block lifting device for lifting a core block in which a cored plate provided with three or more through bolt holes is laminated,
The same number of core block lifting jigs as the through bolt holes having a rod-shaped portion and a tongue-shaped portion provided at one end of the rod-shaped portion so as to be substantially orthogonal to the rod-shaped portion, and the tongue of the core block lifting jig A core block lifting device comprising: a disk-shaped base plate attached to a position corresponding to the through bolt hole so that an end without a shape portion is directed to the same side in the circumferential direction of the tongue shape portion.

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