JPH0984307A - Stator winding disassembling and cutting apparatus for rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to safely, rapidly and efficiently conduct an operation by mechanizing the disassembling and cutting operations of a stator winding as much as possible. SOLUTION: The stator winding disassembling and cutting apparatus comprises a hydraulic batch cutter 21 for cutting the end of the stator winding 4 of a rotary electric machine and a moving unit 10 for moving the cutter 21 radially, circumferentially and axially of a stator frame 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for disassembling and cutting a stator winding, which enables efficient disassembly and cutting of the stator winding when updating the stator winding of a rotary electric machine.

[0002]

2. Description of the Related Art A rotating electric machine is gradually deteriorated during long-term use. Above all, a stator winding of the rotating electric machine is used under severe mechanical stress and thermal stress. Its insulation performance is likely to deteriorate.

In a large rotating electric machine used in a power plant or the like, if the insulation performance of the stator winding deteriorates, it is possible to update the entire stator at once, but the crane capacity is insufficient. In some cases, it is not possible to update the entire stator at once due to problems such as loading and unloading to and from the building, or the overall construction period. In such a case, if the other stator constituent members are sound, it is preferable from the viewpoint of resource economy to update only the stator winding. From such a background, in recent years, the opportunity to update only the stator winding is increasing.

FIG. 4 shows a schematic structure of a stator of a general rotary electric machine, and FIG. 5 shows an external shape of a stator winding. Also,
FIG. 6 shows an example of a conventional method for cutting the stator winding at the ends. In these figures, a large number of slots 3 are formed in a stator core 2 arranged in a stator frame 1 so as to open to the inner surface thereof, and in these slots 3, a stator winding 4 is formed. Has been inserted. Further, a stator winding wedge 5 is inserted in the wedge groove formed at the entrance of the slot 3 in order to fix the stator winding 4 in the slot.

In the stator of the rotating electric machine having such a structure, when the stator winding is to be renewed, first, the stator winding 4 inserted into the slot 3 of the stator core 2 is disassembled. Then need to be removed. However, the stator winding, which is the main current path in the rotating electric machine, is made of a copper material, and its ends are firmly connected by solder or solder. Further, the stator windings and the connecting portions of the end portions are covered with a tough insulating material. Therefore,
When disassembling and removing the stator winding 4, the stator winding wedge 5
After disassembling, the end of the stator winding 4 is cut by some method, and then the stator winding 4 is extracted from the slot 3.

As a method of cutting the end of the stator winding 4,
Gas burner, rotary cutter, or saw-tooth cutter
The method by Among these cutting methods, cutting with a gas burner cannot be adopted because there is a risk of burning the insulating material due to the flame and a risk of causing a fire due to scattering of molten copper. Also, the rotary cutter
The cutting by the method is not adopted because of the generation of chips accompanying the cutting, the difficulty in processing the scattered materials, and the poor cutting efficiency due to the clogging of the cutter due to the copper material. Therefore, at present, manual work by a saw-tooth cutter using a dust collector is exclusively used.

When carrying out the cutting method using the saw-tooth cutter, a wooden scaffold 6 is attached to the end of the stator frame 1 as shown in FIG. The wooden scaffold 6 is manufactured so as to extend to the end of the stator winding 4. A worker rides on this wooden scaffold 6 and uses a dust collector to cut the teeth.
The end portions of the stator winding 4 are sequentially cut one by one by 7. Usually, a total of four workers, two on each side of the stator frame, are engaged in this work. After the cutting work is completed in this way, the stator winding 4 is then sequentially withdrawn from the slot 3, and then a new stator winding is inserted into the slot 3.

[0008]

As described above, the disassembling and cutting work of the stator winding in the power plant tends to be unnatural such as a middle waist because the work is performed inside the narrow stator winding. It is a physically demanding work that requires a lot of manpower, time, and patience.

The present invention provides a disassembling and cutting apparatus which is capable of mechanizing the disassembling and cutting work of a stator winding performed in such a narrow space as much as possible and performing the work safely, quickly and efficiently. The purpose is.

[0010]

DISCLOSURE OF THE INVENTION A stator winding disassembling and cutting apparatus for a rotary electric machine according to the present invention is a hydraulic batch cutting apparatus for cutting an end portion of a stator winding of a rotary electric machine by push cutting, and this hydraulic batch cutting. And a moving device for moving the device in a radial direction, a circumferential direction, and an axial direction of the stator frame.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a moving device is provided with a support attached to an end portion of a stator frame or in the vicinity thereof, and the support device is connected to the support, and the radial direction, the circumferential direction and the axial direction of the stator frame. It can be composed of a support arm and a joint part that can freely change the position of the arm. Also,
The hydraulic batch cutting device can be composed of a pair of frames, a movable cutting blade guided by these frames, and a fixing metal member that closes between the tips of the frames in an openable and closable manner.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In addition, in these figures, FIG.
The same parts as those in FIG. 6 are designated by the same reference numerals.

In FIG. 1, a support 11 of a moving device 10 is provided at both ends of a stator frame 1 accommodating a stator core 2.
It is attached by screwing the bolt 12 into the screw hole formed in the end portion of the stator frame. The moving device 10 includes three support arms 13, 14, 15 and a support arm 1 at the tip.
A holder 16 attached to the No. 5 and joint portions 17 to 20 for connecting the support 11, the support arms 13, 14, 15 and the holder 16 are provided. Joints 17 and 1
Reference numeral 8 is a joint that is rotatable in a horizontal plane, and joints 19 and 20 are joints that are rotatable in a vertical plane. As a result, the holder 16 can be moved to any position in the radial direction, the circumferential direction, and the axial longitudinal direction of the stator frame 1. A hydraulic batch cutting device 21 is attached to the holder 16.

The hydraulic batch cutting device 21 is shown in FIGS.
As shown in FIG. 2, the supporting portion 22, the pair of frames 23a and 23b connected to the supporting portion 22, and the push-cutting type movable cutting blade 2 which is guided by these frames and moves in the vertical direction.
4 and a fixing metal member 25 that closes the forked ends of the frames 23a and 23b. Although not shown, the support portion 22 has a built-in hydraulic cylinder,
Pressure head 26 attached to the tip of the piston rod
Is pinned to the base of the movable cutting blade 24.

One end of the fixing bracket 25 is fixed by a pin 27.
The frame 23a, 23b is rotatably attached near one end of the frame 23a, 23b, and the other end of the fixing member 25 is detachably fixed by a fixing bolt 28 near the other end of the frame 23a, 23b. . Reference numeral 29 denotes bolts and nuts for fixing the frames 23a and 23b in combination. Further, 30 indicates a valve for operating a hydraulic cylinder, and 31 indicates a hydraulic pipe. Although not shown, the hydraulic batch cutting device 21 is provided with a safety device that prevents the hydraulic batch cutting device 21 from being switched on unless a special portion is operated.

Next, the method of use and operation of the device of the present invention constructed as above will be described. First, the moving device 10 is attached to both ends of the stator frame 1 via the support 11, and the holder 16 is provided with the hydraulic batch cutting device 21.
Install. Although FIG. 1 shows only the device of the present invention attached to one end of the stator frame 1, the same applies to the other end of the stator frame 1.

Next, each support arm 13 of the moving device 10,
14 and 15 are manually adjusted as appropriate in the radial direction, the circumferential direction and the axial longitudinal direction, and the hydraulic batch cutting device 21 is moved to the vicinity of the stator winding 4 to be cut. Therefore,
Stator winding 4 for cutting by loosening the fixing bolt 28 of the hydraulic batch cutting device 21 and moving the fixing bracket 25 in the direction of the arrow
Then, the fixing metal fitting 25 is returned to its original position, the fixing bolt 28 is tightened, and the stator winding 4 is wrapped by the frame 23 and the fixing metal fitting 25.

In this state, the valve 30 for operating the hydraulic cylinder is operated, and the movable cutting blade 24 is operated by the hydraulic pressure to cut the stator winding 4 by pressing. After cutting, the fixing bolt 28 is loosened, the fixing metal fitting 25 is moved in the direction of the arrow, and the hydraulic batch cutting device 21 is pulled out from the stator winding 4. Subsequently, the support arms 13, 14, 15 are moved to the position of the stator winding 4 to be cut next. In the same manner, a series of operations are repeated to sequentially cut the stator winding 4.

In this way, the stator windings 4 are sequentially cut, all the stator windings 4 are pulled out from the slots 3, and then new stator windings 4 are inserted into the slots 3 and fixed. By mounting the child winding wedge 5, the stator winding is updated.

In the above description, the moving device 1
Although the support 11 of No. 0 is attached to the stator frame 1, the support 11 may be attached to the inside of the stator core 2 or the end thereof.

[0021]

As described above, when the renewal work due to the deterioration of the insulation performance of the stator winding is performed in a power plant or the like, the disassembly and cutting work of the stator winding is mechanized, which is very easy, quick, and
Moreover, the work can be performed efficiently. Further, since the hydraulic batch cutting method using push-cut is used, there is no concern about generation of cutting powder or spread of scattering, the cutting position can be surely cut, and the risk of fire spread of the insulator can be avoided. Therefore, the labor of disassembling and cutting the stator winding in the work of updating the stator winding, which requires a lot of time and manpower, can be saved, and the effect of improving the stator winding updating work of the rotating electric machine is remarkable. .

[Brief description of drawings]

FIG. 1 is an explanatory view showing a usage state of an embodiment of the device of the present invention.

FIG. 2 is a plan view showing an embodiment of a hydraulic batch cutting device in the device of the present invention.

3 is a side view of the hydraulic batch cutting device shown in FIG. 2. FIG.

FIG. 4 is a vertical cross-sectional view illustrating a schematic structure of a stator of a rotary electric machine to which the present invention is applied.

5 is a perspective view of a stator winding in FIG. 4. FIG.

FIG. 6 is an explanatory diagram showing a stator winding disassembly and cutting method of a conventional rotating electric machine.

[Explanation of symbols]

 1 ...... Stator frame 2 ...... Stator core 3 ...... Slot 4 ...... Stator winding 5 ...... Stator winding wedge 6 ...... Wooden scaffolding 7 ...... Saw cutter 8 ...... Support 9 …… Support arm 10 …… Movement device 11 …… Support 13,14,15 …… Support arm 16 …… Holder 17 to 20 …… Joint part 21 …… Hydraulic batch cutting device 22 …… Support part 23 …… Frame 24 ... Movable cutting blade 25 ... Fixing metal fitting 26 ... Pressurizing head 28 ... Fixing bolt 30 ... Valve for operating hydraulic cylinder 31 ... Hydraulic pipe

Claims (4)

[Claims] 1. A stator winding disassembling and cutting apparatus for a rotary electric machine, which disassembles and cuts a stator winding wound around a stator iron core housed in a stator frame formed in a cylindrical shape. A hydraulic batch cutting device that cuts the ends of the child windings by pressing and a moving device that moves the hydraulic batch cutting device in the radial direction, the circumferential direction, and the axial direction of the stator frame. A stator frame winding disassembly and cutting device for a rotating electric machine. 2. A support in which a moving device is attached to an end of a stator frame, and a support which is connected to the support and can freely change the position of the stator frame in the radial direction, the circumferential direction and the axial direction. The stator winding disassembling and cutting apparatus for a rotating electric machine according to claim 1, wherein the stator winding disassembling and cutting apparatus comprises an arm and a joint portion. 3. The fixing of the rotating electric machine according to claim 1 or 2, wherein the support is mounted in the stator core or at the end of the stator core instead of at the end of the stator frame. Sub winding disassembly and cutting device. 4. The hydraulic batch cutting device comprises a pair of frames, a movable cutting blade guided by these frames, and a fixing metal fitting for opening and closing between the tips of the frames. The stator winding disassembling and cutting apparatus for a rotating electric machine according to claim 1 or 2.