JP4691810B2 - Disassembly and assembly support device for large motors - Google Patents

Description

【００３０】
また、本発明による分解、組立支援装置を用いて新たな大型交流電動機を据付ける際に、回転子を支持する軸受の芯出し開始までに要する概略的時間を、従来技術のジャッキダウン方式を用いた場合に要する時間と比較した。その結果（単位：時間）を表２に示す。なお、本発明では、軸受台も組み込んで一体搬送している。
【００３１】

【００３２】
表１および表２に示した結果から分るように、本発明による分解、組立支援装置を用いて大型電動機の分解、組立および据付を行なうと、従来のジャッキアップおよびジャッキダウン方式に比べて大幅に所要時間を短縮することができる。
上記実施の形態において、大型交流電動機について示したが、他の電動機や発電機等にもこの発明は適用できる。
【００３３】
【発明の効果】
以上説明したように、この発明の分解、組立支援装置によれば、ピットが小さい場合の制約を受けることなく、回転子と固定子との分解、組立作業を容易に、しかも短時間で行うことができるとともに、接触による損傷を防止することができる。
【図面の簡単な説明】
【図１】この発明にかかる大型交流電動機の分解組立て支援装置の正面図である。
【図２】同じく、側面図である。
【図３】同じく、大型交流電動機の分解組立作業を示す概略的な説明図である。
【図４】一般的な大型交流電動機の構造を示す概略図である。
【図５】 (a)〜(b)は、電動機の固定子移動による点検作業を説明する図である。
【図６】 (a)〜(c)は、電動機のジャッキダウン方式による据付け作業を説明する図である。
【符号の説明】
１０ 電動機
１１ ピット
１２ 軸受
１３ カップリング
１４ シャフト
１６ 界磁コイル
２０ 回転子
２２ 鉄心
２４ コイル
２６ フレーム
３０ 固定子
３１ ライナー
３３ 吊りビーム
３５ ジャッキ
４０ 架構
４２ 回転子用吊り具
４３ チェーン（ワイヤロープ）
４４ 固定子用吊り具
４５ チェーン（ワイヤロープ）
４６ 回転子用吊りブロック
４８ 固定子用吊りブロック
４９ 吊耳
５０ 受け架台[0001]
[Industrial application fields]
The present invention relates to a disassembly and assembly support device that disassembles a rotor and a stator of a large electric motor such as an AC motor for driving a rolling mill or an assembly operation of a rotor and a stator.
[0002]
[Prior art]
When the motor 10 is described as an example of a synchronous motor, generally, as shown in FIG. 4, a rotor 14 including a shaft 14 supported by a bearing base 12, a field coil 16, an iron core 22, And a stator 30 comprising a coil 24, a frame 26 and the like.
[0003]
For example, in a large electric motor such as an AC electric motor for driving a rolling mill, it is necessary to cool the coil 16 of the rotor 20, the coil 24 of the stator 30 and the iron core 22 when the electric motor 10 is driven. A cooling method is adopted in which cooling air from a fan provided outside the electric motor 10 is passed between the poles of the rotor 20 or through the air duct of the stator 30.
[0004]
In such a cooling method, dust may adhere particularly to the coil surface and the air duct. The adhering dust may adversely affect the insulation of the coil, etc., and may clog the air duct. In this case, there is a possibility that the coil cannot be cooled, so it is necessary to periodically check and clean the dust.
[0005]
The coil 24 of the stator 30 is housed in a slot (groove) formed on the surface of the iron core 22 together with a spacer and is fixed so as not to move by a wedge. In order to loosen due to thinning over time, it is necessary to periodically check the wedge, and if it is loose, it is necessary to replace it with a new wedge.
[0006]
For the above reasons, when inspecting and cleaning the motor, first disassemble the rotor and stator, and after inspection and cleaning, or after replacing parts as necessary, disassemble The work of assembling the rotor 20 and the stator 30 is performed.
[0007]
FIGS. 5A to 5B are diagrams illustrating an example of disassembling work between the rotor and the stator of the large electric motor. This conventional example is called "stator (stator) movement". The installation surface of the stator 30 is used as a slide seat, and the stator 30 is placed on the rotor seat on the slide seat for inspection and cleaning. The stator 30 is separated from the rotor 20 only by moving in the axial direction of the rotor 20, and after inspection and cleaning, the stator 30 and the rotor 20 are assembled by moving in the opposite direction on the slide seat.
[0008]
Thus, the structure in which the stator 30 is slidable in the pit 11 is
Since the movement of the rotor 20 is unnecessary at the time of inspection and cleaning, and the treatment of the bearing stand 12 and the coupling 13 that support the rotor 20 is unnecessary, it is often adopted as a simple method.
[0009]
When a large motor is newly installed at a predetermined location, the rotor 20 is inserted into the stator 30 at another location, and the integrated rotor 20 and stator 30 are moved to the installation location. First, the stator 30 is moved to the installation location using an overhead crane or the like, and then the rotor 20 is moved to the installation location, where the rotor 20 is inserted inside the stator 30 and assembled. The method of performing the installation work is common.
[0010]
For example, when installing in the latter manner, first, the lower half of the bearing base 12 that supports the rotor 20 is set in advance, and then the stator 30 is moved to the installation position using an overhead crane or the like. Then, it is raised with a liner 31 to a height at which the rotor 20 can be inserted (see FIG. 6A). Next, the rotor 20 is slowly inserted so as not to come into contact with the inside of the stator 30 while being moved with the suspension beam 33 suspended (see FIG. 6B). Thereafter, the rotor 30 is supported by the jack 35 so as to float from the liner 31, and the stator 30 is moved by a distance smaller than the gap between the stator 30 and the rotor 20 in a state where the liner 31 is appropriately removed. The rotor 35 in the suspended state is slowly lowered by the jack 35, and is lowered by slowly moving the suspension beam 33 within the remaining gap between the stator 30 (FIG. 6 (c)). reference). Such an operation is carefully performed until the shaft 14 of the rotor 20 is supported by the lower half of the bearing base 12 installed in advance, and then the rotor 20 is centered and the stator 30 is centered. Then, the upper half of the bearing stand 12 is installed and other accessories are installed to complete the installation.
[0011]
[Problems to be solved by the invention]
By the way, the working environment that enables the inspection and cleaning of the large motor by the “stator movement” as described above is such that the size of the pit 11 storing a part of the stator 30 is such that the stator 30 is pivoted by a predetermined distance. For example, when replacing an existing DC motor with an AC motor that is usually larger than the existing DC motor so that it can be moved in the direction. The pit 11 cannot be enlarged corresponding to the machine, that is, the modification of the foundation cannot be easily performed due to the relationship with other equipment, so there is enough space to slide the stator 30 in the pit. There is a problem that the method of “stator movement” cannot be adopted.
[0012]
The installation of the large-sized AC machine in such a case is performed, for example, by a method called jack-down as described with reference to FIGS. 6 (a) to 6 (c), but requires a lot of time and labor. And On the other hand, since the inspection work is an environment in which the “stator movement” method cannot be used, a jack-up method opposite to the jack-down method installation work must be used. Similar to the installation work, it requires a great deal of time and effort, and even during work performed with great care, there is a risk that the rotor 20 and the stator 30 may come into contact with each other and be damaged. There was a problem.
[0013]
The present invention has been made to solve the above-described problems, and can be easily disassembled and assembled without being restricted by a small pit for accommodating a part of the motor below the installation surface. And it aims at obtaining the disassembly-and-assembly support apparatus which can be performed in a short time and can prevent the damage by the contact of a rotor and a stator.
[0014]
[Means for Solving the Problems]
As a result of intensive studies to achieve the above object, the inventors have arrived at the present invention having the following contents. That is, the present invention performs an operation of disassembling a large electric motor in which a stator is installed in a pit in which a part of the stator is stored under the installation surface into a rotor and a stator, or an operation of assembling the rotor and the stator. Yes degradation in the assembled support device, and the electric motor is gate-shaped, which is arranged on the installation surface is installed Frames, a hanger for suspending the rotor at two points near both ends of the shaft of the rotor And a suspension block for the rotor movably disposed on the upper portion of the frame, and a suspension for suspending the stator, and between the receiving position and the retracted position on the upper portion of the frame. A suspension block for the stator that is movably disposed between the outer suspension position and the inner retraction position of the frame, and is disposed so as to be fixed on the motor installation surface at the retraction position , receiving capable mounting the stator in the retracted position Decomposition of the constructed large motor from and ironing board, and assembly support device. (Here, the receiving position means the installation position of the electric motor in the axial direction. The retraction position is the position in the axial direction, and the rotor and the stator are lifted at the installation position of the electric motor. (It means the position where the stator is located when only the stator is moved in the axial direction from the position and the stator is in the shaft position of the rotor.)
[0015]
The cradle can also be configured with a movable part that moves the stator between the receiving position and the retracted position in a state where the stator is placed, and adopts such a configuration. In this case, the main body of the receiving stand is fixed with respect to the electric motor installation surface, and only the movable part on which the stator is placed is moved between the receiving position and the retracted position.
[0016]
According to the above configuration, the rotor and the stator can be easily disassembled and assembled in a short time without being restricted when the pit size in which a part of the large motor is accommodated is small, In addition, damage due to contact between the rotor and the stator can be prevented.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a front view of a large-sized motor disassembly / assembly support device according to the present invention, FIG. 2 is a side view of the same, and FIG. 3 is a schematic explanatory view showing disassembly / assembly work. Corresponding parts are denoted by the same reference numerals.
[0018]
In the figure, reference numeral 40 denotes a gate-shaped frame disposed on the installation surface on which the large-sized electric motor 10 is installed so as to surround the electric motor 10. The rotor suspension 42 and the stator suspension 44 for separately suspending the stator 30 and the rotor suspension block 46 and the stator suspension block 48 having these separately are movable in a horizontal plane. It is arranged.
[0019]
As shown in FIG. 1, the rotor suspension block 46 has a suspension 42 made of a chain 43 (or a wire rope) wound around the shaft 14 of the rotor 20 so as to be orthogonal to the axial direction. The chain block pair is disposed at two positions along the axial direction, and the chain block pair is disposed at two positions in the front and rear of the stator 30 along the axial direction. In other words, the rotor 20 is suspended at two locations near both ends of the shaft by a suspension 42 that is hung around the shaft 14, and is parallel to the installation surface by simultaneous driving of the pair of front and rear chain blocks. While being held, it is moved in the vertical direction and the axial direction.
[0020]
On the other hand, as shown in FIG. 2, the stator suspension block 48 has a suspension 44 made of a chain 45 (or wire rope) hung on a suspension ear 49 provided at the upper end of the frame 26 of the stator 30. And it arrange | positions in the position of two front and back with respect to an axial direction. That is, the stator 30 is suspended by a hanging tool 44 hung on a hanging ear 49 and is moved in the vertical direction and the axial direction by driving the suspension block 48 for the stator.
[0021]
In the disassembly and assembly support apparatus according to the present invention, a receiving stand 50 for placing the stator 30 moved by the lifting tools 42 and 44 is disposed on the electric motor installation surface in the portal frame 40. . The receiving stand 50 in this embodiment is configured to be movable along the axial direction of the stator 30 on which it is placed from the outside to the inside of the frame 40 or in the opposite direction.
[0022]
Such a receiving stand 50 is carried in from the outside to the inside of the frame 40 and is used in a state of being fixed to the electric motor installation surface. In another embodiment, a sliding device is installed on the upper surface of the receiving stand 50. The stator 30 may be configured to be movable between the receiving position and the retracted position. In addition, a sliding device may be installed on the lower surface of the cradle 50 so that the stator 30 can be moved between the receiving position and the retracted position together with the cradle.
Next, an operation procedure for disassembling and assembling a large AC motor using the disassembly and assembly support device of the present invention will be described.
First, the cover covering the already installed large AC motor stator 30 is removed in advance, the coupling 13 is trimmed, the upper half of the bearing base 12 is removed, and then the rotor suspension is removed. By driving the block 46 and the suspension block 48 for the stator, the respective suspension members 42 and 44 are moved to the installation positions of the stator 30 and the rotor 30, and further, the suspension bases 12 and 44 are attached to the bearing stand 12. The supported rotor 20 and stator 30 are suspended at the same time and slowly raised, and stopped at a position where the stator 30 is at a height that does not interfere with the pit 11.
[0024]
On the other hand, after the receiving frame 50 is moved from the outside of the frame 40 to the “retraction position” in the frame, the receiving frame 50 is fixed on the motor installation surface. Next, the stator suspension block 48 is driven to move the stator 30 to the retracted position of the gantry 50. At this time, the stator 30 is in the position of the shaft 14 of the rotor 20, and then the stator 30 is lowered and placed on the receiving stand 50.
[0025]
Here, the stator 30 is moved to the retracted position by the stator suspension block 48. However, when the sliding device is installed on the upper surface or the lower surface of the receiving base 50, the stator 30 is moved to the receiving position. Then, it may be placed on the receiving stand 50 and moved to the retracted position.
[0026]
In this manner, the coil is inspected in a state where the rotor 20 remaining in the “receiving position” and the stator 30 moved to the “retracted position” are separated from each other. After completing the coil inspection, restore the motor in the reverse order.
[0027]
In the above, the disassembly and assembly work for checking the coils of the rotor 20 and the stator 30 of the large AC motor that has already been installed have been described. Installation can be performed by the following procedure. In particular, when there are no crane restrictions, the rotor and stator are transported together to the “receiving position”, and then the position of the bearing stand 12 is adjusted, the coupling 13 is treated, and the centering operation is performed. Installation can be completed.
[0028]
When disassembling a large AC motor for the purpose of coil inspection using the disassembly and assembly support device according to the present invention, the approximate time required to start the inspection work is required when the conventional jack-up method is used. Compared with time. The results (unit: time) are shown in Table 1.
[0029]

[0030]
In addition, when installing a new large AC motor using the disassembly and assembly support device according to the present invention, the approximate time required to start centering of the bearing supporting the rotor is used for the conventional jackdown method. It was compared with the time required. The results (unit: time) are shown in Table 2. In the present invention, a bearing stand is also incorporated and conveyed integrally.
[0031]

[0032]
As can be seen from the results shown in Tables 1 and 2, when the large motor is disassembled, assembled and installed using the disassembly and assembly support device according to the present invention, it is significantly larger than the conventional jack-up and jack-down methods. The required time can be shortened.
Although the large AC motor has been described in the above embodiment, the present invention can be applied to other motors and generators.
[0033]
【The invention's effect】
As described above, according to the disassembly and assembly support device of the present invention, disassembly and assembly of the rotor and the stator can be performed easily and in a short time without being restricted by a small pit. Can be prevented and damage due to contact can be prevented.
[Brief description of the drawings]
FIG. 1 is a front view of a large-sized AC motor disassembly and assembly support apparatus according to the present invention.
FIG. 2 is a side view of the same.
FIG. 3 is a schematic explanatory view showing the disassembling and assembling work of the large AC motor, similarly.
FIG. 4 is a schematic diagram showing the structure of a general large AC motor.
FIGS. 5A to 5B are views for explaining inspection work by moving a stator of an electric motor. FIG.
FIGS. 6A to 6C are diagrams illustrating an installation work by a jack-down method of an electric motor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Electric motor 11 Pit 12 Bearing 13 Coupling 14 Shaft 16 Field coil 20 Rotor 22 Iron core 24 Coil 26 Frame 30 Stator 31 Liner 33 Suspension beam 35 Jack 40 Frame 42 Rotor hanger 43 Chain (wire rope)
44 Stator suspension 45 Chain (wire rope)
46 Rotor suspension block 48 Stator suspension block 49 Suspension ear 50 Receiving base

Claims (2)

In a disassembly and assembly support device for disassembling a large electric motor in which a stator is installed in a pit for storing a part of the stator below the installation surface into a rotor and a stator or assembling a rotor and a stator,
A gate-shaped frame disposed on an installation surface on which the electric motor is to be installed;
A suspension block for a rotor, which has a suspension for suspending the rotor at two locations near both ends of the shaft of the rotor, and is movably disposed above the frame;
A suspension block for the stator having a suspension for suspending the stator, and disposed on the upper part of the frame so as to be movable between a receiving position and a retracted position;
Is movable between an outside and inside of the retreat position of said Frames are disposed so as to be fixed on the motor mounting surface in said retracted position, a receiving frame which can be placed said stator in said retracted position ,
Disassembly and assembly support device for large motors composed of
(Here, the receiving position means the installation position of the electric motor in the axial direction.
Further, the retreat position is a position in the axial direction, and the rotor and the stator are lifted at the installation position of the electric motor, and only the stator is moved in the axial direction from this position, and the stator is moved to the rotor. This means the position where the stator is located when it is in the shaft position. ) In a disassembly and assembly support device for disassembling a large electric motor in which a stator is installed in a pit for storing a part of the stator under the installation surface into a rotor and a stator or assembling a rotor and a stator ,
A gate-shaped frame disposed on an installation surface on which the electric motor is to be installed;
A suspension block for a rotor, which has a suspension for suspending the rotor at two locations near both ends of the shaft of the rotor, and is movably disposed above the frame;
A suspension block for a stator having a suspension for suspending the stator, and movably disposed on an upper portion of the frame;
In a state where the stator is placed, a receiving frame provided on the motor installation surface of the frame having a movable part that moves the stator between a receiving position and a retracted position;
Disassembly and assembly support device for large motors composed of
(Here, the receiving position means the installation position of the electric motor in the axial direction.
Further, the retreat position is a position in the axial direction, and the rotor and the stator are lifted at the installation position of the electric motor, and only the stator is moved in the axial direction from this position, and the stator is moved to the rotor. This means the position where the stator is located when it is in the shaft position. )

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