JPH10120361A - Rotor hoisting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor hoisting device, which can automatically perform the adjustment of a rotor such as a turbine rotor in the horizontal direction and the axial direction thereof at the same time. SOLUTION: A rotor hoisting device for hoisting a rotor 2 through a balance 3 is formed of an obliquity detecting means 25 for detecting obliquity of the balance 3 at the time of hoisting the rotor 2, a pair of axial load detecting means 26, 27 for detecting the axial load of the rotor 2, a balance weight 29 provided in a balance pole 7 of the balance 3 and for taking a balance of the balance pole 7, a computing means 30 for computing the moved amount of a balance weight so that obliquity of the balance pole 7 becomes zero on the basis of the information detected by the obliquity detecting means 25, and a balance weight moving means 19 for moving the balance weight on the basis of the moved amount of the balance weight, a computing means 40 for computing the moving distance of a thimble on the basis of the information detected by the axial load detecting means 26, 27 and a thimble moving means 9 for moving a thimble on the basis of the moving distance obtained by the computing means 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor lifting device, and more particularly to a rotor lifting device for lifting a rotor of a large generator installed in a nuclear power plant or a thermal power plant.

[0002]

2. Description of the Related Art Conventionally, a turbine rotor of a large generator is
Lifted by a crane via a balance, a pair of displacement detection means detects each lift displacement amount at both ends of the turbine rotor, and based on the detected information, arithmetic means reduces the unbalance of the lift displacement amounts at both ends of the turbine rotor to zero. The lifting device of the turbine which calculates the moving position of the ballast weight member so that the ballast weight member is moved to the position by the moving device in accordance with the obtained moving position by the calculating device, and performs horizontal adjustment of the turbine rotor. It has been proposed (JP-A-6-312893).

[0003]

However, in reality, even if the wire rope is not vertical and is slightly inclined even when the horizontal adjustment is performed, when the turbine rotor is lifted (at the time of ground cutting). In addition, there is a problem that the turbine rotor moves in the axial direction and the moving blades and the stationary blades come into contact with each other, causing troubles such as damage thereof.

[0004] Therefore, some control is required to suppress the axial movement of the turbine rotor to zero or within an allowable range. The present invention has been made based on such knowledge, and it is an object of the present invention to provide a rotor lifting device capable of automatically performing not only horizontal adjustment of a rotor such as a turbine rotor but also axial adjustment at the same time.

[0005]

That is, the present invention provides a rotor lifting device in which both ends of a rotor are supported by a pair of wires attached to both ends of a balance and the rotor is lifted by a crane via the balance. When lifting, the inclination detecting means for detecting the inclination of the balance, a pair of axial load detecting means for detecting the axial load of the rotor, provided on the balance rod of the balance, a balance weight to balance the balance rod, Calculating means for calculating the amount of movement of the balance weight so that the degree of inclination of the balance bar becomes zero based on the detection information from the degree of inclination detecting means; moving means for moving the balance weight in accordance with the amount of movement obtained by the calculating means Calculating means for calculating the moving distance of the thimble based on the detection information from the axial load detecting means,
A thimble moving means for moving the thimble in accordance with the moving distance obtained by the calculating means.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a rotor 2, both ends of which are supported by a casing 1, is supported by a pair of wire ropes 4, 4 hanging from a balance 3. Further, a pair of suspension ropes 5 and 5 attached to the balance 3 are attached to hooks 6 of an overhead crane (not shown).
Therefore, the rotor 2 can be moved by the overhead crane through the balance 3.
Can be lifted.

The wire rope 4 is attached to a thimble 8 slidably provided on a balance bar 7 of the balance 3. A nut 10 provided in the thimble 8 is screwed to a pair of ball screws 9 provided in the balance bar 7. Accordingly, the thimble 8 is moved rightward or leftward along the balance bar 7 by rotating the ball screw 9 forward or backward by the servomotor 11. Further, a jack 12 for moving the thimble 8 up and down is provided in the thimble 8. Therefore, the nut part 10 is attached to the thimble 8 so as not to obstruct the thimble 8 up and down.

Further, water tanks 13 and 14 for ballast are provided at both ends of the balance bar 7. These water tanks 1
3 and 14 are communicated by two pipes 15 and 16. A branch pipe 17 branched from one communication pipe 15 is connected to a suction port of a water pump 19, and a branch pipe 18 branched from the other communication pipe 16 is connected to a discharge port of the water pump 19. The first communication pipe 15 is provided with opening and closing valves 21 and 22 on both sides thereof with a branch pipe 17 interposed therebetween, and the second communication pipe 16 is provided with opening and closing valves 23 and 22 on both sides thereof with a branch pipe 18 interposed therebetween. 24 are provided. Then, ballast water 29 is transferred from the left water tank 13 to the right water tank 14.
, When the valves 21 and 24 are opened,
When the ballast water 29 is transferred from the main water tank 14 to the left water tank 13, the valves 22 and 23 are “open” and the valves 21 and 24 are “closed”. To

Further, an inclination sensor 25 is provided on the balance bar 7 to measure the inclination of the balance bar 7 at the time of lifting, and the controller 30 adjusts the inclination to a cello, that is, the balance water so that the balance bar 7 is horizontal. The amount of movement is determined. The controller 30 calculates a movement amount of the ballast water based on the measurement data from the tilt sensor 25 so that the inclination becomes zero, and operates the water pump drive motor 20 based on the calculation information. First to determine conditions
, A first driver 33 for operating the water pump motor 20 based on the operating conditions, and a second sequencer for determining operating conditions for the valves 21, 24; 22, 23 based on the calculation information. 34, and second and third drivers 35 and 36 for operating the valves 21, 24; 22, 23 based on the operating conditions.

On the other hand, a pair of wedge-shaped load cells 26 and 27 are interposed between the rotor 2 and the casing 1, and the axial load of the rotor 2 during lifting is measured, and the controller 40 controls the thimble so that the left and right loads are balanced. The horizontal movement length of 8, 8 is determined. The controller 40 calculates a moving amount of the thimbles 8 and 8 based on the measurement data from the wedge-type load cells 26 and 27 so that the left and right axial loads are balanced, and a calculator 41 based on the calculation information. Sequencer 4 for determining operating conditions of servo motors 11 and 11
2 and the servo motors 11, 11 based on the operating conditions.
Drivers 43 and 44 and an operation panel 45 for operating
It is composed of The main controller 40 and the slave controller 30 are connected to each other, and perform control integrally.

Next, the operation of the rotor lifting device having the above-described structure will be described. 1) As shown in FIG. 2, the center of gravity GB1 of the balance 3 is set at the center of the balance 3 (the liquid levels of the left and right tanks are equalized), and the jacks of the thimbles 8, 8 are set at the lower limit. 2) Next, the thimbles 8 and 8 of the balance 3 are set to the positions at the time of the previous inspection, the pair of wire ropes 4 are hung on the thimbles 8, and the position Gw of the hook 6 of the crane is substantially true of the center of gravity GR of the rotor 2. Move up.

3) Next, as shown in FIG. 3, the wire ropes 4, 4 hung on the thimbles 8, 8 are previously placed below the rotor shaft.
It is connected to the inserted U-strap fitting 28. 4) Next, wedges 26 and 27 incorporating a load cell for measuring an axial load are mounted between the rotor 2 and the casing 1, and the signals of the load cells 26 and 27 are transmitted to the controller 4
Connect to 0. The wedge also has a role of restricting the axial movement of the rotor at the time of ground cutting.

5) Next, as shown in FIG. 4, the wire ropes 4 and 4 are stretched by the main winding, and the movement and inclination (inclinometer) of the balance 3 and the tension and inclination of the wire ropes 4 and 4 are observed. . If the tension and inclination of the wire ropes 4 and 4 have a right and left imbalance, the thimbles 8 and 8 will be moved up and down,
Adjust lateral movement and stretch vertically to prevent looseness. At this time, the balance 3 is leveled so that the display on the inclinometer 25 of the balance 3 becomes zero.

6) When the balance 3 is largely moved in the axial direction, the crane is slightly moved by manual operation so as to reduce the error δR1 between the position Gw of the hook 6 of the crane and the center of gravity GR of the rotor. In order to maintain the verticality of the wire ropes 4, 4, the axial movement of the crane and the manual lateral movement of the thimbles 8, 8 are a pair of operations. Steps 5) and 6) are repeated as long as manual operation is possible.

7) Up to this point, the operation is a manual operation, but in the following, an "automatic lifting mode" is entered. 8) As shown in FIG. 5, by simultaneously moving the right and left thimbles 8 and 8 upward at a very low speed, the rotor 2 is slowly raised until one of the bearings is grounded until immediately before the rotor is ground. The adjustments of (a) and (b) are performed automatically.

A) According to the signal of the inclination sensor 25, the rotor 2
When the balance water is automatically moved so that the horizontality of the balance is zero or within the allowable range, the center of gravity GC of the balance 3 is adjusted.
Is moved leftward from the center GB1 by LC and the balance 3 becomes horizontal. b) Using the signals of the wedge-type load cells 26 and 27, the rotor 2
The lateral movement of the thimbles 8, 8 is automatically adjusted so that the axial loads of the thimbles 8 are balanced. For example, as shown in FIG. 5, the center of gravity GR of the rotor 2 is shifted to the right from the center GB1 of the balance 3 by δR.
When the rotor 2 is displaced by one, the load on the left load cell 26 becomes larger than that on the right load cell 27 as the rotor 2 moves to the left, so that the thimbles 8 and 8 move to the right as shown by the two-dot chain line. Slide.

9) If the above two automatic adjustments fall within the permissible range, a state where the left and right sides of the rotor are simultaneously grounded while the axial movement of the rotor is within the permissible range is obtained (FIG. 6). ). In the above description, the case where the inclination sensor was used as the horizontal means of the balance was described. However, the present invention is not limited to this. For example, horizontal adjustment is performed based on the load difference applied to the wire rope, or both ends of the rotor are adjusted. Horizontal adjustment may be performed based on the lifting displacement amount difference.

[0018]

As described above, according to the present invention, not only horizontal adjustment of a rotor such as a turbine rotor but also axial movement adjustment can be automatically performed at the same time. Therefore,
The rotor does not move in the axial direction when the rotor is ground, and troubles such as contact between the moving blade and the stationary blade can be prevented beforehand.

[Brief description of the drawings]

FIG. 1 is a schematic view of a rotor lifting device according to the present invention.

FIG. 2 is an explanatory view in which a balance is moved almost directly above a rotor.

FIG. 3 is an explanatory diagram in which a wire rope is hung on a rotor.

FIG. 4 is an explanatory view of position adjustment of a balance and a wire rope.

FIG. 5 is an explanatory diagram for performing position adjustment of a thimble by a wedge-type load sensor.

FIG. 6 is an explanatory view for holding a balance horizontally by moving a balance weight.

[Description of Signs] 2 Rotor 3 Balance 4 Wire 7 Balance Rod 9 Thimble Moving Means 19 Balance Weight Moving Means 25 Incline Degree Detecting Means 26, 27 Axial Load Detecting Means 29 Balance Weight 30 Calculation Means 40 for Calculating Movement of Balance Weight Calculation means for calculating the moving distance of the thimble

Continued on the front page (72) Inventor Katsuyoshi Abe 3-1-1, Tamano-shi, Tamano-shi, Okayama Prefecture Mitsui Engineering & Shipbuilding Co., Ltd. (72) Inventor Tetsuji Tamura 3-1-1, Tamano-shi, Tamano-shi, Okayama Mitsui Engineering & Shipbuilding Tamano Office Co., Ltd.

Claims (1)

[Claims] 1. A rotor lifting device that supports both ends of a rotor with a pair of wires attached to both ends of a balance and lifts the rotor via a balance by a crane, wherein when the rotor is lifted, the inclination of the balance is adjusted. A pair of axial load detecting means for detecting an axial load of the rotor, a balance weight provided on a balance rod of the balance, and a balance weight for balancing the balance rod; Calculating means for calculating the amount of movement of the balance weight so that the inclination of the balance bar becomes zero based on the amount of movement; moving means for moving the balance weight in accordance with the amount of movement obtained by the calculating means; detection from the axial load detecting means Calculating means for calculating the moving distance of the thimble based on the information; thimble according to the moving distance determined by the calculating means Thimble moving means for thimble moved to moved, the rotor consists of lifting device.