KR100557277B1 - Motor-Driven Device for Drawing and Inserting Rotor for Use in Generator - Google Patents

Abstract

The present invention relates to a transmission device for the generator rotor pull-out and insertion for regular inspection or repair of the generator, and more particularly, a gear box and a gear box decelerated by receiving the driving force from the drive motor and the drive motor to reduce it; The present invention relates to a transmission device for generator rotor withdrawal and insertion that facilitates the withdrawal and insertion of a generator rotor, including a transfer bar having a rack gear for linear motion by receiving a driving force.

The present invention provides a transmission apparatus for drawing out or inserting a rotor of a generator, comprising: a base having a base top plate 306 and a base fixing plate 302; A drive motor 312 provided on one side of the base 304; A gear box 330 disposed on the base top plate 306 and including a drive spur gear for reducing the driving force transmitted from the drive motor 312; A driving force transmission device for transmitting a driving force from the driving motor 312 to the gear box 330; And a transfer bar 340 having a rack gear 342 which receives a driving force from the driving spur gear and makes a linear motion.

Generator, rotor, drawout, insert, gearbox, pinion gear, rack gear, reduction ratio

Description

Motor-Driven Device for Drawing and Inserting Rotor for Use in Generator}

1 is a view schematically showing the operation of drawing out the rotor according to the prior art,

2 is a view schematically showing the operation of inserting the rotor according to the prior art,

3 is a front view of the generator rotor pull-out and insertion apparatus according to a preferred embodiment of the present invention,

Figure 4 is a side view of the generator rotor pull-out and insertion apparatus according to a preferred embodiment of the present invention,

5 is a view illustrating a state in which a rotor coupling flange and a connection pipe are coupled to a transfer bar in a generator rotor drawing-out and insertion apparatus according to a preferred embodiment of the present invention;

6 is a diagram illustrating the gear box in more detail in the generator rotor pull-out and insertion apparatus according to a preferred embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

100: rotor 110: stator

200: wire 210: wire wrench

302: base fixing plate 304: base

306: base top plate 308: control box

310: remote control 312: drive motor

320: lever 330: gearbox

340: transfer bar 342: rack gear

350: connecting pipe 402: clutch

502: coupling hole 504: coupling pin

602: first spur gear 604: second spur gear

610: third spur gear 616: fourth spur gear

622, 624: guide roller 626, 628: guide spur gear

The present invention relates to a transmission device for the generator rotor pull-out and insertion for regular inspection or repair of the generator, and more particularly, a gear box and a gear box decelerated by receiving the driving force from the drive motor and the drive motor to reduce it; The present invention relates to a transmission device for generator rotor withdrawal and insertion that facilitates the withdrawal and insertion of a generator rotor, including a transfer bar having a rack gear for linear motion by receiving a driving force.

Generators are a very important component of power generation facilities such as thermal, hydro and nuclear power plants. Generators are devices that convert mechanical rotational energy into electrical energy, such as direct current generators, synchronous generators, and induction generators. The generator is usually composed of a stator, a rotor, a bearing, and an exciter. The rotor refers to a rotating part of the generator, and a stationary part is called a stator.

Plan for regular internal inspection and maintenance of various large-scale generators It is necessary to draw out the generator rotor and to insert the rotor again after the inspection or maintenance is completed in the preventive maintenance work or the restoration work caused by the sudden breakdown of the generator. Do.

However, in the related art, the drawing and insertion of the rotor is performed by a manpower using a chain block.

1 is a view schematically showing the operation of drawing out the rotor according to the prior art, Figure 2 is a view schematically showing the operation of inserting the rotor in accordance with the prior art.

First, the operation of drawing out the rotor will be briefly described with reference to FIG. 1.

The chain 120 is connected to one end of the rotor 100, and the support chain 130 connected to the crane is connected to the intermediate body of the rotor 100 to support the rotor 100. Meanwhile, between the stator 110 and the rotor 100, a steel air gap shim 136 and a shoe 132 are positioned to rotate the rotor 100 with the stator 110. Avoid direct friction.

After this, the chain 120 is pulled out and the rotor 100 is pulled out. When the rotor 100 is pulled out of the stator 110 during the drawing operation, the rotor 100 is supported by supporting a wood block (140) at the bottom of the rotor 100.

Next, the rotor 100 is taken out to inspect, maintain or repair the rotor. After the inspection or maintenance of the rotor is completed, the operation of inserting the rotor 100 back into the stator 110 will be described with reference to FIG. 2.

One end of the wire 200 for insertion is fixed to the end of the rotor 100, and the other end of the wire 200 is fixed to the outside of the generator. While supporting the rotor 100 with the support chain 130, a shoe 132 is provided between the rotor 100 and the stator 110 and the wire 200 is pulled using the wire wrench 210. . At this time, by matching the operating speed of both wire wrench 210 so that the rotor 100 is inserted into the stator 110 without being rocked around the rotation axis.

However, the weight of the rotor usually ranges from several tons to tens of tons, so it is very difficult and dangerous to carry out the drawing and insertion of the rotor by manpower, and it takes a long time. There was this.

In addition, the rotor should be withdrawn or inserted along the axis of rotation, even if there is an operator who monitors it, the rotor accidentally hits the stator.

Conventionally, in order to solve this problem, a rotor take-out / insertion apparatus of a generator has been proposed, but a conventional rotor take-out / insertion apparatus is difficult to transfer a large power by simply combining a pinion gear, a rack ear and a rack gear. There was this. In addition, there is a problem that the rack gear can be bent because there is no means for supporting the rack gear, there was a problem that practical application is difficult.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a motor rotor withdrawal and insertion apparatus capable of withdrawing or inserting a motor rotor using a drive motor.

In addition, an object of the present invention is to provide a gear box for receiving the driving force of the drive motor to reduce it, and to provide a guide roller and a guide spur gear for preventing bending or detachment of the transfer bar having a rack gear. The purpose.

In order to achieve the above object, the present invention is a transmission device for drawing or inserting the rotor of the generator, the base having a base top plate 306 and the base fixing plate 302; A drive motor 312 provided on one side of the base 304; A gear box 330 disposed on the base top plate 306 and including a drive spur gear for reducing the driving force transmitted from the drive motor 312; A driving force transmission device for transmitting a driving force from the driving motor 312 to the gear box 330; And a transfer bar 340 having a rack gear 342 which receives a driving force from the driving spur gear and makes a linear motion.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

3 is a front view of a generator rotor extracting and inserting transmission apparatus according to a preferred embodiment of the present invention, Figure 4 is a side view of a generator rotor extracting and insertion apparatus according to a preferred embodiment of the present invention.

Power generator for extracting and inserting the generator rotor according to the present invention greatly reduces the driving force received from the base 304 for supporting the upper structure, a drive motor (312) for generating a driving force, a drive motor 312 It comprises a gear box (Gear Box 330) and the transfer bar (340) to be a linear movement by the driving force received from the final pinion gear (Pinion Gear) of the gear box 330.

Base 304 is a member for supporting the lower portion of the generator rotor pull-out and insertion according to the invention and attaching the drive motor 312 on one side. The base fixing plate 302 is provided below the base 304. The base fixing plate 302 is provided with a fixture (not shown) for fixing the generator rotor withdrawal and insertion transmission device according to the present invention on the bottom when the rotor is pulled out or inserted. An anchor bolt or the like is inserted into the fixture to fix the base 304 firmly to the floor.

On the other hand, it is also possible to fix the base fixing plate 302 to the wheeled conveying means without fixing the base fixing plate 302 directly to the floor. In this case, the transport means must be fixed to the floor and the withdrawal or insertion of the rotor should be performed to ensure the stability of the work and to prevent safety accidents.

A base top plate 306 is provided at an upper end of the base 304, and a gear box 330 is placed in the base top plate 306. The base 304 serves to transfer the load received from the base top plate 306 to the base fixing plate 302 and to support the load. Preferably, each side or each corner of the base 304 has a reinforcing frame ( Frame) and reinforcing steel plates may be attached to each side.

One surface of the base 304 is provided with a control box (308). The control box 308 adjusts the operation of the driving motor 312 according to a signal input through the remote controller 310. The remote controller 310 may be wired or wireless, and the remote controller 310 may include a button for forward rotation, reverse rotation, and stop of the driving motor 312.

One side of the base 304 is provided with a drive motor 312. The drive shaft sprocket 314 is provided on the drive shaft of the drive motor 312. A drive chain 316 is coupled to the drive side sprocket 314, and the drive chain 316 is connected to the gear side sprocket 318 provided in the gear box 330 and is separated from the drive side sprocket 314. The driving force is transmitted to the gear side sprocket 318.

In a preferred embodiment of the present invention, the drive side sprocket 314 and the gear side sprocket 318 and the drive chain 316 as a device for transmitting the power generated from the drive motor 312 to the gear box 330. It is also possible to use other driving force transmission means in addition to employing. That is, in some cases, a combination of a pulley and a driving belt may be used as the driving force transmission means, or another means effective for transmitting the driving force may be used, such as using a shaft for transmitting the driving force.

On the other hand, in the case of the drive motor 312, it is more preferable to use a geared motor (geared motor) than a general motor. The geared motor refers to a combination of an electric motor and a reduction gear unit. When the geared motor is used as the driving motor 312, the number of gears of the gear box 330 used for deceleration is reduced, or the gear for deceleration is used. There is an advantage to reduce the size ratio of the.

The driving force generated in the drive motor 312 is transmitted to the gear box 330 through the drive shaft sprocket 314, the drive chain 316, and the gear side sprocket 318. In the gear box 330, the driving force transmitted from the driving motor 312 is reduced and transmitted to the transfer bar 340. The gear box 330 will be described in detail later.

The transfer bar 340 includes a support bar 344 having a rectangular cross section and a rack gear 342 provided under the support bar 344. The support bar 344 is a member for supporting the transfer bar 340 to minimize the deflection of the transfer bar 340, and the rack gear 342 receives the driving force from the final pinion gear of the gear box 330 to rotate Is a member that converts the linear motion.

On the other hand, a clutch Clutch 402 is provided between the gear shaft sprocket 318 and the rotation shaft of the first spur gear 602 in the gear box 330 to which the driving force is first transmitted from the gear sprocket 318. The operation of the clutch 402 is controlled by the lever 320, and the lever 320 may be manipulated to determine whether to transmit the driving force. The clutch 402 may stop the forward and backward operation of the transfer bar 340 by cutting off power transmission in an emergency. In addition, the clutch 402 may be disconnected and the transfer bar 340 may be manually moved.

Particularly, when fine adjustment is required during the drawing or insertion of the rotor, the transmission of power is stopped by using the clutch 402, and the transfer bar 340 is gradually transferred to the manpower.

One end of the transfer bar 340 is provided with a rotor coupling flange (346). The rotor coupling flange 346 is coupled to one end of the rotor 100 to securely hold the rotor 100 when the rotor 100 is withdrawn or inserted. 3 shows that the connecting pipe 350 is attached to the rotor coupling flange 346. When the length of the transfer bar 340 is not sufficient for the insertion or withdrawal of the rotor 100, the rotor coupling is shown. The connection pipe 350 is attached to the flange 346 to increase the length.

The connecting pipe 350 is provided with a first flange 352 and a second flange 354, the first flange 352 is formed to be coupled to the rotor coupling flange 346, the second flange is a rotor Like the coupling flange 346 is formed to be coupled to one end of the rotor (100). The connection pipe 350 is preferably a carbon steel pipe (metal symbol: SPP) for piping in order to maintain sufficient strength. However, in the practice of the present invention, the material of the connecting pipe 350 is not limited to the above-described SPP, and may be made of another metal material if sufficient strength is maintained.

When the rotor coupling flange 346 and the connection pipe 350 is coupled to the transfer bar 340 in more detail as follows.

5 is a diagram illustrating a state in which a rotor coupling flange and a connection pipe are coupled to a transfer bar in a generator rotor drawing-out and insertion apparatus according to a preferred embodiment of the present invention.

A coupling pin 504 is inserted through the coupling hole 502 provided at the end of the transfer bar 340 to couple the rotor coupling flange 346 to the transfer bar 340.

In the coupling of the rotor coupling flange 346 to the transfer bar 340 may be used, such as welding, but as shown in Figure 5 when coupled using the coupling pin 504 flange for coupling the rotor ( The flow of the 346 is possible to some extent so that the rotor 100 may be absorbed even when the rotor 100 flows slightly when the rotor 100 is withdrawn or inserted. In addition, as described above, the rotor coupling flange 346 and the first flange 352 are coupled to each other, the coupling hole 506 is formed on the rotor coupling flange 346 and the first flange 352, respectively. It is.

Next, a description will be given of the gear box 330 which is one of the most important components in the generator rotor pull-out and insertion according to the present invention.

6 is a diagram illustrating the gear box in more detail in the generator rotor pull-out and insertion apparatus according to a preferred embodiment of the present invention.

In the gear box 330, a guide spur gear for transmitting a driving force to the rack gear 342 of the transfer bar 340 and a guide roller for preventing bending or detachment of the transfer bar 340. 622 and 624 and guide spur gears 626 and 628.

The drive spur gear consists of a second spur gear 604, a third spur gear 610, and a fourth spur gear 616 as well as a first spur gear 602 that receives a driving force from the gear side sprocket 318.

The first spur gear 602 is provided with only one spur gear on the outer circumferential surface, but the second spur gear 604, the third spur gear 610 and the fourth spur gear 616 are the outer gears 606 and 612. 618 and the inner gears 608, 614, 620 are two types of spur gears of different diameters are combined.

The coupling of the driving spur gear is as follows.

The first spur gear 602 is meshed with the second outer gear 606 of the second spur gear 604. The diameter of the second outer gear 606 of the second spur gear 604 is larger than the diameter of the first spur gear 602. Accordingly, the rotational speed of the second spur gear 604 is a ratio of the diameter of the first spur gear 602 and the second outer gear 604 (that is, the gear) relative to the rotational speed of the first spur gear 602. Decreases by the number of teeth).

The second inner gear 608 of the second spur gear 604 is meshed with the third outer gear 612 of the third spur gear 610. Accordingly, the rotation speed of the third spur gear 610 is a ratio of the diameter of the second inner gear 608 and the third outer gear 612 (that is, the gear) compared to the rotation speed of the second spur gear 604. Decreases by the number of teeth).

The third inner gear 614 of the third spur gear 610 meshes with the fourth outer gear 618 of the fourth spur gear 616. Accordingly, the number of revolutions of the fourth spur gear 616 is equal to the ratio of the diameters of the third inner gear 614 and the fourth outer gear 618 to the number of revolutions of the third spur gear 610 (that is, the number of gear teeth). Decreases by).

Finally, the fourth inner gear 620 of the fourth spur gear 616 is engaged with the rack gear 342 to transmit the driving force to the rack gear 342. At this time, since the fourth inner gear 620 is connected to the same shaft as the fourth outer gear 618, the rotation speed of the fourth inner gear 620 is equal to the rotation speed of the fourth outer gear 618.

In this way, the driving force transmitted to the first spur gear 602 is decelerated while passing through the second spur gear 604, the third spur gear 610, and the fourth spur gear 616 and transmitted to the rack gear 342. Will be.

The reduction ratio in which the driving force transmitted to the first spur gear 602 is decelerated in the gear box 330 may be calculated as in Equation 1.

here,

a: number of teeth of the first spur gear 602,

b1: number of teeth of the second outer gear 606 of the second spur gear 604,

b2: number of teeth of the second inner gear 608 of the second spur gear 604,

c1: number of teeth of the third outer gear 612 of the third spur gear 610,

c2: number of teeth of the third inner gear 614 of the third spur gear 610,

d1: number of teeth of fourth outer gear 618 of fourth spur gear 616

to be.

On the other hand, since the fourth inner gear 620 meshes with the rack gear 342 of the transfer bar 340, the forward and backward speeds of the transfer bar 340 are equal to the circumferential speed of the fourth inner gear 620. If the rotational speed of the first spur gear 602 is X rpm, the feed distance per minute of the feed bar 340 may be expressed by Equation 2 below.

here,

M: feed distance per minute of the feed bar 340 [mm],

π: circumference

X: rotation speed [rpm] of the first spur gear 602,

D: diameter [mm] of the fourth inner gear 620 of the fourth spur gear 616.

to be.

On the other hand, when the geared motor is used as the drive motor 312, deceleration occurs primarily in the geared motor itself, and when the diameter of the gear side sprocket 318 is smaller than the diameter of the drive side sprocket 314, the drive side Deceleration occurs even in the process of transmitting a driving force from the sprocket 314 to the gear side sprocket 318.

Therefore, the driving force generated in the initial motor goes through a number of processes, in particular, the deceleration occurs in the gear box, so that the transfer bar 340 can be moved back and forth in a state of receiving sufficient force.

Next, the guide spur gears 626 and 628 and the guide rollers 622 and 624 will be described.

The guide spur gears 626, 628 mesh with the rack gear 342 without engaging the drive spur gear. The guide spur gears 626 and 628 serve to support the rack gear 342 from the bottom while rotating in engagement with the rack gear 342. The guide spur gears 626 and 628 enable stable forward and backward operation of the transfer bar 340, and also prevent sagging of the transfer bar 340.

Guide rollers 622 and 624 are provided at an upper portion of the transfer bar 340 to support an upper portion of the transfer bar 340. The guide rollers 622 and 624 rotate according to the movement of the transfer bar 340, and enable the stable forward and backward operation of the transfer bar 340 together with the guide spur gears 626 and 628. The outer circumferential surfaces of the guide rollers 622 and 624 preferably have a film made of compressed rubber or urethane to effectively rotate and simultaneously support the transfer bar 340 according to the rotation of the transfer bar 340.

On the other hand, when drawing out or inserting the rotor 100 of the generator using the generator rotor outgoing and insertion transmission apparatus described so far, the feed bar 340 should be matched with the rotation axis of the rotor 100. In this way, when the rotor 100 is withdrawn or inserted, it does not collide with the stator 110. Therefore, by adjusting the length of the base so that the transfer bar 340 on the rotation axis center of the rotor 100, or in the installation of the generator rotor pull-out and insertion transmission device according to the present invention Measures should be taken, such as having a separate support plate under the base 302.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

As described above, according to the present invention, withdrawal or insertion of expensive rotors can be performed by using an electric apparatus without using manpower, thereby reducing workforce and time during regular inspection or fixing repair of the rotor. In addition to being able to prevent accidents.

In addition, according to the present invention, it is possible to take out and insert the rotor while minimizing damage to the generator rotor.

Further, according to the present invention, the combination of the drive spur gears in the gearbox has the advantage that it is possible to transmit sufficient power to the transfer bar without straining the drive motor.

In addition, according to the present invention, since the transfer bar is fully supported by the guide roller and the guide spur gear provided in the gear box, and the front and rear operation is performed, there is an advantage that the rotor can be withdrawn and inserted while minimizing the deflection of the transfer bar. .

Claims (13)

In the transmission device for drawing or inserting the rotor of the generator, A base 304 having a base top plate 306 and a base fixing plate 302; A drive motor 312 provided on one side of the base 304; A gear box 330 disposed on the base top plate 306 and including a drive spur gear for reducing the driving force transmitted from the drive motor 312; A driving force transmission device for transmitting a driving force from the driving motor 312 to the gear box 330; And Transfer bar 340 having a rack gear 342 that is a linear motion receives the driving force from the drive spur gear Generator rotor extraction and insertion comprising a transmission. The method of claim 1, The drive motor 312 is a transmission device for generator rotor withdrawal and insertion, characterized in that the geared motor (Geared Motor). The method of claim 2, The base 304 is provided with a control box 308 for controlling the operation of the drive motor 312, the operation of the control box 308 generator rotor characterized in that controlled by the remote control 310 Powertrain for drawing and inserting. The method of claim 1, Transmission device for the generator rotor pull-out and insertion, characterized in that between the drive force transmission device and the drive spur gear in the gear box 330 is provided with a clutch (402) for connecting / blocking the transmission of the drive force. The method of claim 4, wherein The driving force transmission device, A drive side sprocket 314 attached to a drive shaft of the drive motor 312, a gear side sprocket 318 for transmitting a driving force to the drive spur gear in the gear box 330, and the drive side sprocket 314; And a drive chain (316) for connecting the gear side sprocket (318). The method according to any one of claims 1 to 5, Generator rotor characterized in that the end of the transfer bar 340 is provided with a rotor coupling flange 346 for engaging with one end of the rotor 100 in order to withdraw or insert the rotor (100) Powertrain for drawing and inserting. The method of claim 6, The rotor coupling flange 346 is fixed to the transfer bar 340 by inserting a coupling pin 504 into the coupling hole 502 provided at the distal end of the transfer bar 340. Power transmission device for generator rotor withdrawal and insertion. The method of claim 6, The rotor coupling flange 346, one or more connecting pipes 350 for extending the length of the transfer bar 340 is coupled to the generator rotor pull-out and insertion. The method of claim 8, The transfer pipe 350 has a first flange 352 coupled to the rotor coupling flange 346 at one end thereof, and a second end having a shape capable of engaging with one end of the rotor 100 at the other end thereof. A generator apparatus for extracting and inserting generator rotors, comprising: a flange 354. The method according to any one of claims 1 to 5, The drive spur gear in the gear box 330, A first spur gear 602 receiving the driving force received from the driving force transmission device for the first time; A second outer gear 606 meshed with the first spur gear 602 and a second diameter smaller than the second outer gear 606 and coupled coaxially with the second outer gear 606. A second spur gear 604 to which the inner gear 608 is coupled; A third outer gear 612 meshed with the second inner gear 608 and a third smaller diameter than the third outer gear 612 and coaxially coupled with the third outer gear 612. A third spur gear 610 to which the three inner gears 614 are coupled; And The fourth outer gear 618 meshing with the third inner gear 614 and the fourth outer gear 618 has a diameter smaller than that of the fourth outer gear 618 is coaxially coupled with the fourth outer gear 618; Fourth Spur Gear 616 With Four Inner Gear 620 Attached Power generator for drawing out and insert generator rotor comprising a. The method of claim 8, The drive spur gear in the gear box 330, A first spur gear 602 receiving the driving force received from the driving force transmission device for the first time; A second outer gear 606 meshed with the first spur gear 602 and a second diameter smaller than the second outer gear 606 and coupled coaxially with the second outer gear 606. A second spur gear 604 to which the inner gear 608 is coupled; A third outer gear 612 meshed with the second inner gear 608 and a third smaller diameter than the third outer gear 612 and coaxially coupled with the third outer gear 612. A third spur gear 616 to which the three inner gears 614 are coupled; The fourth outer gear 618 meshing with the third inner gear 614 and the fourth outer gear 618 has a diameter smaller than that of the fourth outer gear 618 is coaxially coupled with the fourth outer gear 618; Fourth Spur Gear 610 With Four Inner Gear 620 Attached Power generator for drawing out and insert generator rotor comprising a. The method of claim 10, The gear box 330, Power generator for extracting and inserting the generator rotor, characterized in that it comprises one or more guide rollers (622, 624) for supporting the transfer bar (340). The method of claim 10, The gear box 330, Generator rotor withdrawal and insertion, characterized in that it comprises one or more guide spur gears (626, 628) supporting the transfer bar 340 while rotating in engagement with the rack gear 342 of the transfer bar (340). Power transmission device.

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