KR101452974B1

KR101452974B1 - Turbine power plant turbine stands for non-destructive testing method of setting the master

Info

Publication number: KR101452974B1
Application number: KR1020140054880A
Authority: KR
Inventors: 김기주
Original assignee: 김기주
Priority date: 2014-05-08
Filing date: 2014-05-08
Publication date: 2014-10-22

Abstract

The present invention relates to a turbine stand setting master for a turbine non-destructive test for a power plant and to a method thereof. More specifically, when the cracks, corrosion, and damage of a turbine shaft generated using fire power, nuclear power, combined heat, and gas turbines are automatically inspected, the installation time for a turbine is reduced, and reliability for inspection results can be improved. Accordingly, a turbine inspection can be normally performed. The turbine stand setting master of the present invention includes: a drive part stand on which a turbine shaft is put and a guide rod having a rotary shaft for rotating a pair of rollers is installed on the body thereof; and a driven part stand which is installed at a particular distance from the drive part stand and on which a guide rod having a rotary shaft connected with a pair of rollers put on the turbine shaft is installed on the body thereof. The turbine stand setting master of the present invention comprises: a laser distance measuring device which consists of a laser distance measuring device installed on a setting housing at a particular interval on the top of a gauge separation support which constitutes a round unit coupled with the top of the roller of the drive part stand; and a target device which installs a target at a particular interval on the top of a target separation support which constitutes a round unit coupled with the top of the rollers of the driven part stand. The laser distance measuring device and target device are installed to be disposed on the side surface of the roller by further installing a roller side fitting stopper in one front side of the gauge roller support.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turbine stand set for non-destructive testing of a turbine for a power plant,

The present invention relates to a turbine stand setting master and method for non-destructive inspection of a turbine for a power plant, and more particularly, to a turbine stand setting master and a turbine stand setting method for automatically checking a turbine shaft crack, corrosion, The present invention relates to a turbine stand setting master and method for a turbine non-destructive inspection for a power plant that shortens the installation time of the turbine shaft, raises the reliability of the inspection result, and enables the turbine inspection to be normally performed.

Ultrasonic testing for fine crack detection on the turbine blade root and surface due to stress corrosion, fatigue, etc. is currently performed in a variety of ways, but ultrasound testing of the blade roots can be performed in various forms of blades,

The complexity of the test and the lack of testing techniques make testing methods, defect assessment and signal interpretation difficult. In the case of foreign countries, much research is being conducted to establish the ultrasound inspection technology for the root portion of the blade, and the turbine manufacturers have provided their own inspection techniques and procedures. However, in Korea, It is a fact that they are receiving foreign technology guidance and consultation. In particular, since the accident occurred in 1986 when the fork of the blade root portion was cut off at the fifth stage of the low-pressure turbine manufactured by General Electric Company (GE) of Gori No.3, the GE non- Ultrasonic inspection of the blade root area has been carried out by the team every year during regular maintenance period.

The ultrasonic inspection method for the main components of the primary system of the nuclear power plant has already established the inspection method and acceptance criteria by performing the inspection according to the ASME CODE, but the applicable codes, specifications and inspection standards have not yet been established for inspection of turbine blades And it is controlled by the unilateral recommendation of the manufacturer and inspection demand. Therefore, the ultrasonic inspection for this field adopts the method that is suitable for the purpose through stress analysis, fracture mechanics, material behavior analysis, etc., and establishes the ultrasonic inspection technique that reaches the inspection method and sum / .

At present, turbine blade ultrasonic inspection requires more than 7 ultrasonic transducers for one blade root, and when it is directly inspected by a human hand, the stability of the operation and the reliability of the inspection result are greatly degraded at the inspection area with limited access area.

In particular, the conventional turbine nondestructive inspection requires a lot of labor and time even if it is a skilled inspector. Therefore, the necessity of automatic inspection is strongly required in electric power companies of each country. For the automatic nondestructive inspection of turbine parts including the blade root part, a device that is automatically driven at the corresponding part of the turbine is essential, and a robot is used for this purpose. However, a general inspection robot is suitable for driving the plane portion, but it can not be applied to the complex geometry of the turbine.

As the operation period of power generation facilities has increased, frequent accidents due to major parts damage of turbine facilities have caused shutdown of power generation facilities. In order to secure the safety of power generation facilities and increase utilization rate, Has attracted considerable attention.

Rotating machinery, such as turbines, are subjected to more load by increasing the number of shutdown operations, and defects and material damage at these locations can cause gradual deterioration of the material and cause unforeseen problems at the plant. In the case of a power plant accident,

It is necessary to thoroughly inspect equipment and repair it to prevent accidents because it may cause a situation to stop the life and production activities of the entire power supply area.

Since the turbine is a high-speed rotating machine under high temperature and high pressure, it has been known as a component that is likely to cause defects such as brittleness, stress corrosion, and corrosion fatigue in the blade, rotor or disk during a long operation. Among them, the turbine blades have a very wide circle

It is damaged by phosphorus. In this case, the blades are dismantled and the visual inspection (VT), liquid penetration inspection (PT), magnetic particle inspection (MT), phased array (PA) and ultrasonic inspection (UT) It is difficult to detect minute defects such as fatigue cracks of the blade, and various problems such as air delay and blade balancing must be taken into consideration when fastening the blade. Therefore, In order to evaluate the results of non-destructive testing, it is necessary to develop a nondestructive inspection technique that can be applied to a turbine by a mechanical device, rather than a movement of a probe by a human hand. So that the driving-side stand 10 and the driven-shaft stand 20, which are rotated, rotate a pair of rollers, When the frost and the like that do not meet the horizontal support, so let the turbine shaft made of a normal rotation and to become a defect inspection of a turbine as described above can not occur, in the situation that is emerging as a problem that the reliability of the test result decreases.

Particularly, in order to normally perform the inspection of the turbine, it takes a lot of time to set the drive side and the driven side stand, and it takes 8 to 12 hours. Even if these conditions are satisfied, , There is a problem that the inspection time is delayed, and the delay of such time causes a loss of several billions of won per day.

Literature 1. Patent Registration No. 0339039 (registered on May 20, 2002) Document 2. Patent Registration No. 0358085 (registered on October 10, 2002) Literature 3. Patent Registration No. 0567662 (Registered on Mar. 29, 2006) Literature 4. Patent Registration No. 0957273 (Registered on May 03, 2010)

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a turbine control system for a turbine, which can accurately check the height, position, and interval of a turbine shaft for rotating the turbine shaft, And to provide reliability of test results.

Another object of the present invention is to provide a turbine stand capable of accurately and quickly processing a distance and height position and level through a laser by coupling a laser distance measuring device to a lawn of a driving stand and a target device to a lawn of a driven stand, The present invention has been made to solve the above problems.

The present invention relates to a wind turbine comprising a drive side stand on which a turbine shaft is mounted and on which a guide bar provided with a rotation axis for rotating a pair of rollers is installed, and a pair of rollers mounted on the drive side stand, And a guide stand on which a connected rotary shaft is installed is mounted on the main body to perform a nondestructive inspection of the turbine,
A laser distance measuring device comprising a laser distance measuring device provided on a setting housing at a predetermined interval on an upper side of a gage separating pedestal for forming a round part to be coupled to the upper side of the driving side stand;
And a target device for setting a target at a predetermined interval above a separation support for a target for forming a round portion to be coupled to an upper side of the floor of the driven stand;
Wherein the laser distance measuring device and the target device are further provided with a stopper for lowering the lateral side to one side of the front side of the gauge louver pedestal so as to be positioned on the lateral side of the louver.

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In order to check a turbine for a power plant, the height, position, and spacing of a rotating stand of the turbine shaft are accurately adjusted using laser and target to facilitate the nondestructive inspection and improve the reliability of the inspection result .

In the present invention, a laser distance measuring device is attached to a roller of a driving side stand, and a target device is attached to a roller of a driven side stand at the same time, and a distance and height for non-destructive inspection through a laser and a target, Can be accurately and promptly processed, and the settling time of the turbine stand can be saved by 30% or less with a small number of persons, thereby correcting the loss that may occur due to power generation, thereby reducing the damage and greatly improving the productivity of electricity.

1 is a front view of an installation state showing a preferred embodiment of the present invention;
Fig. 2 is a side view of the driving side stand of the present invention
3 is a side view of the laser distance measuring apparatus of the present invention
4 is a plan view of the laser distance measuring apparatus of the present invention
Fig. 5 is an enlarged cross-sectional view of an installation state of the setting jig according to the present invention
6 is a side view of the mounted state of the driven stand of the present invention
7 is a side view of the target apparatus of the present invention
8 is a top view of the target device of the present invention
9 is a front view of the turbine of the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front view of an installation state showing a preferred embodiment of the present invention, and FIG. 2 is a side view of a mounted state of a driving-side stand of the present invention.

The power of the geared motor 15 provided on a part of the main body 11 is connected to the roller sprocket 18 provided on the rotary shaft 14 of the roller 13 by the chain 17 from the motor sprocket 16 And a driving side stand 10 for connecting the laser distance measuring device 30 is installed on the upper side of the roller 13.

A pair of rollers 23 are installed on a rotation shaft 24 provided at a predetermined distance from the drive side stand 10 and passing through the guide table 22 on the upper side of the main body 21, Side stand 20 for connecting the target device 40 is provided on the upper side of the target side.

The main bodies 11 and 21 are provided with foundation bolts 19 and 26 on the lower side to adjust the height and level and the rotary shafts 14 and 24 are rotatably installed on the guides 12 and 22. [

Levels 10a and 25 are provided in the laser distance measuring device 30 and the target device 40, respectively, so that the horizontal state can be confirmed.

The driving-side stand 10 and the driven-side stand 20 are installed so as to maintain a precise distance, position, height, and level through a laser at a predetermined interval.

FIG. 3 is a side view of the laser distance measuring apparatus of the present invention, FIG. 4 is a plan view of the laser distance measuring apparatus of the present invention, and FIG. 5 is an enlarged sectional view of the setting jig for the setting jig of the present invention.

The laser distance measuring device 30 is provided with a laser distance measuring device 34 provided on both sides of the gauge louver 31 for gauges having a predetermined spacing therebetween through a housing 33, The laser distance measuring device 24 is provided with a round section 32 for stopping the laser 10 to be positioned on one side of the roller 13, Install it.

The gauge louver bracket 31 is formed with a handle 31a at the central upper side and a setting hole 36 formed at one side of the lower side to connect the setting jig 37 with the fixing bolt 38.

The setting housing 33 is coupled to the gauge louver pedestal 31 by using a fixing screw 39 and a set screw 39a is installed on one side of the fixing screw 39 to adjust and fix the position Respectively.

A level 10a is provided on the upper side of the gauge louver base 31 so that the horizontal state can be confirmed.

FIG. 7 is a side view of the target apparatus of the present invention, and FIG. 8 is a plan view of the target apparatus of the present invention.

The target device 40 is provided with a target 43 on the both sides of the target supporting laurel pedestal 41 with a predetermined interval and a lower target And a stopper 44 for aligning the runners is provided on the front of the target louver pedestal 41 so as to be positioned on one side of the louver 23.

A handle 47 is formed on the center upper side of the target lorra pedestal 41 and a setting hole 45 is formed on one side of the lower side to connect the setting jig 46 with the fixing bolt 48.

A level 25 is provided on the upper side of the target lorra pedestal 41 so that the horizontal state can be confirmed.

9 is a front view showing a state in which the turbine of the present invention is installed. The distance and height between the drive-side stand 10 and the driven-side stand 20 are measured using the gauge distance measuring device 30 and the target device 40 The turbine shaft 51 formed on both sides of the turbine 50 is placed on the upper side of the rollers 13 and 23 to perform the nondestructive inspection at a constant speed (0.2 to 1 rotation per minute).

The turbine stand setting master for the turbine non-destructive inspection according to the present invention having the above-described configuration is required to set a zero point to prevent an error between the laser distance measuring device 30 and the target device 40, And the setting jigs 37 and 46 are fixed to the setting grooves 36 and 45 of the target lenticular pedestal 41 and are fixed by the fixing bolts 38 and 48. The laser distance measuring device 30 and the target device (40), and then the laser is fired by the laser distance meter (34) so as to exactly match the zero point of the target (43);

The fixing screw 39 provided with the housing 33 for setting is unfastened and the set screw 39a is used to supply the correct zero point.

It is also possible to apply a method of setting and fixing the level by using the levels 10a and 25 of the gauge louver pedestal 31 and the surface louver pedestal 41. [

In order to perform the nondestructive inspection of the turbine 50 by using the drive side stand 10 and the driven side stand 20, the drive side stand 10 and the driven side stand 20 are kept at a constant spacing The laser distance measuring device 30 is placed on the upper side of the drive side stand 10 and the target stop 40 is placed on the upper side of the driven side stand 20.

The laser distance measuring apparatus 30 is provided with a round section 32 provided on the front side of the gauge lath bracket 31, 35 are set at the correct positions on both sides of the roller 13.

The target device 40 includes a forward portion of a round portion 42 mounted on a pair of louvers 23 and a front portion of a target side louver base 41, So that both sides are set at correct positions on the side surface of the roller roller 23.

And the side fitting stoppers 35 and 44 are set at positions facing each other at the rollers 13 and 23. [

After the gauge distance measuring device 30 is coupled to the driving side stand 10 and the target device 40 is coupled to the driven side stand 20, the laser distance measuring device 34 of the gauge distance measuring device 30 So that the laser is fed forward.

However, the laser emitted by the laser range finder 34 may be displayed on the target 43 formed on the target device 40 facing the target to confirm whether the distance and the position are correct.

It is possible to set the height by measuring the distance and height between the laser distance measuring device 34 and the target 43 to control the correct distance of the rollers 13 and 23 and then controlling the foundation bolts 19 and 26.

The positions of the drive-side stand 10 and the driven-side stand 20 may be mutually different, and it is preferable to use the levels 10a and 25.

As described above, since the present invention can be set accurately for about 15 minutes with 2 to 3 persons, the setting time is greatly reduced compared to the conventional 5 to 6 persons and 8 to 12 hours, It is possible to save the setting time of the stand and perform the non-destructive inspection in a stable state, thereby providing the reliability of the inspection result and at the same time, it can provide a profit of 50 ~ 8 billion won per day.

In the state where the drive-side stand 10 and the driven-side stand 20 are installed as described above, the weight of one turbine 50 is raised to 28 tons, and the weight of the other turbine 50 is 64 tons, So that it can be loaded on the rollers 13 and 23 to perform the nondestructive inspection.

The power of the guide motor 15 provided on the drive side stand 10 is transmitted from the motor sprocket 16 to the louver sprocket 18 through the chain 17 to rotate the rotary shaft 14 so that the louver 13 So that the pair of rollers 23 provided on the driven stand 10 are rotated and the turbine 50 is rotated to perform the nondestructive inspection.

The present invention is a setting operation for measuring the distance and height quickly and conveniently using the laser distance measuring device and the target device for the nondestructive inspection of the turbine by using the laser distance measuring device and the target device, And to provide useful inventions.

10: drive side sprocket 11, 21:
12, 22: Guide stand 13, 23: Laura
14, 24: rotary shaft 15: geared motor
16: Motor sprocket 17: Chain
18: Laura sprocket 19. 26: Foundation bolt
20: Servo sprocket 30: Laser distance measuring device
31: Laura stand for laser 32, 42:
33: Housing for setting 34: Laser range finder
35, 44: lower side stopper 36, 45: setting groove
37, 46: setting jig 38, 48: fixing bolt
39: Fixing screw 39a: Set screw
40: target device 43: target
50: turbine 51: turbine shaft

Claims

A drive side stand 10 in which a guide base 12 provided with a rotary shaft 14 on which a turbine shaft 51 is mounted and which rotates a pair of rollers 13 is mounted on the main body 11, And a guide stand 22 provided with a rotation axis 24 connected to a pair of rollers 23 on which a turbine shaft 51 is mounted is installed at a predetermined interval and is mounted on a main body 21 A turbine stand set-top master for performing a nondestructive inspection of a turbine (50)
A laser distance measuring device 33 is installed on the setting housing 33 at a predetermined interval on the upper side of the gage separating pedestal 31 forming the round portion 32 to be coupled to the upper side of the roller 13 of the drive side stand 10, A laser distance measuring device (30) comprising a laser (34);
A target device 40 for setting a target 43 at a predetermined interval above a separation support 41 for a target to form a round portion 42 to be coupled to the upper side of the roller 23 of the driven stand 20, &Lt; / RTI >
The laser distance measuring device 30 and the target device 40 are provided with stoppers 35 and 44 for aligning the side surfaces of the gauges 31 and 41 to the front side of the gauges, And a turbine stand setting master for non-destructive inspection of the turbine for a power plant.

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The method according to claim 1,
The laser distance measuring apparatus 30 is configured such that the housing 33 for setting is coupled to the gauge louver bracket 31 by a fixing screw 39 and a set screw 39a is installed at one side of the fixing screw 39 The turbine stand set setting master for non-destructive inspection of a turbine for a power plant.

The method according to claim 1,
The laser distance measuring device 30 and the target device 40 are provided with setting grooves 36 and 45 downward to fix the setting jigs 37 and 46 with fixing bolts 38 and 48 Turbine Stand Set Master for Nondestructive Testing of Turbines for Power Generation.

The method according to claim 1,
The drive side stand 10 is connected to a chain 17 of a motor sprocket 16 of a geared motor 15 provided on the main body 11 and is connected to a roller 17 of a rotary shaft 14 for installing a pair of rollers 13. [ And the turbine shaft (51) is connected to the sprocket (18) so that the turbine shaft (51) is rotated at a constant speed. A turbine stand setting master for nondestructive inspection of a turbine for a power plant.

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