JP3171946B2 - Center hole inspection device for turbine rotor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for inspecting a center hole of a turbine rotor, which automates an inspection operation.

[0002]

2. Description of the Related Art In the inspection of the center hole of a turbine rotor, a non-destructive test is performed from the inner surface of a hole drilled in the center of the rotor as a soundness inspection means for preventing the destruction of the rotor, which is an important rotating component. This nondestructive test is performed on the surface and inside of the hole.

FIGS. 15 and 16 show a specific method of inspecting the center hole of a turbine rotor. The inspection is performed using a dedicated inspection device for each inspection such as the borescope device 3 shown in FIG. 15 and the ultrasonic flaw detector 4 shown in FIG.

[0004] Inspection work is performed on the center hole 2 of the turbine rotor 1.
The surface inspection is performed by the borescope device 3, and the internal inspection is performed by the center hole ultrasonic inspection device 4 including the probe 5, the probe driving mechanism 6, and the ultrasonic inspection device 7.

[0005] In each inspection, an inspector constantly observes and monitors.
When a flaw is detected, the data of the position, angle and size of the flaw in the longitudinal direction are recorded, and after the completion of the test, each test result is determined and written on a recording sheet.

[0006]

However, in the conventional inspection work of the center hole of the turbine rotor, a dedicated inspection device for each inspection type is required to be aligned, centered, operated, observed, and inspected.
Since a series of operations from entry to the recording paper and preparation of the inspection record were all performed manually by the inspector, there was a disadvantage that much time and labor was required. In addition, there is a possibility that an artificial error such as a transcription error or a calculation error at the time of record creation may occur.

Accordingly, an object of the present invention is to provide an apparatus for inspecting the center hole of a turbine rotor, which can accurately perform the work from the inspection of the center hole of the turbine rotor to the creation of a record in a short time, and can save and reproduce the inspection data. Is to do.

[0008]

In order to achieve the above object, the present invention provides an inspection sensor which can be inserted into a center hole of a turbine rotor, and which can exchange a CCD camera and a composite ultrasonic probe. An inspection sensor drive device having a lifter, which is capable of horizontally and vertically moving the inspection sensor and rotatably mounted, and a plurality of motors mounted on the inspection sensor driving device for moving and rotating the inspection sensor,
A driver that sends a signal to each of the motors, a controller that controls the operation of each of the motors, and an internal inspection using a composite ultrasonic probe converts an inspection signal into a position and size of a flaw to determine the flaw. and a processor for storing these data, said surface portion inspection by the CCD camera is obtained by constituted by a video recorder which is stored as it is an image of flaws, a printer for printing the data.

[0009]

According to the above arrangement, the inspection data of the center hole of the turbine rotor automatically inspected by the inspection sensor constituted by the CCD camera or the composite ultrasonic probe is represented by C
In surface inspection using a CD camera, the image, including the position, angle, and size of the flaw, is copied by a printer and stored in a recorder. In addition, by replacing only the tip head, the internal inspection using the composite ultrasonic probe can be performed, and the detection data of the flaw is input to the processor as an inspection signal, and the position and size of the flaw are determined from the inspection signal in the processor. Is calculated and displayed. This display screen is copied by a printer. Next, it is determined that the processor cannot be operated, and a record of the result is output by the printer.

Therefore, while the surface portion and the internal inspection were conventionally inspected by separate dedicated inspection devices, both inspections can be performed only by replacing the tip head. In addition, when a flaw was detected in the surface inspection, the scale was read and recorded in the conventional apparatus, and the length was calculated from the magnification conversion table. If an operation of sandwiching both ends of the flaw with a cursor displayed on the screen is performed, the measured value is displayed on the monitor screen, which can be recorded by the printer. In addition, if an internal inspection failure is detected, the conventional device makes a note of the position in the longitudinal, angle, and depth directions and the reflected peak value for each flaw, and after the inspection, calculates the magnitude one by one from the reflected peak value The processor can automatically detect the position of the flaw, calculate the size of the flaw, and create a record using a printer, greatly reducing the time required for inspection work. In addition to shortening, it is also possible to eliminate human errors such as transcription errors and calculation errors.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing one embodiment of the present invention.
In the figure, reference numeral 10 denotes a turbine rotor center hole inspection device.
A D color camera head (shown in FIG. 9) or a composite ultrasonic probe head (shown in FIG. 10) is configured to be replaceable, and the inspection sensor 13 is connected to the center hole 2 of the turbine rotor 1. Rod 14 and inspection sensor 13
Pantograph holder 15 for holding the center of the center hole 2
And a moving table 16 that performs axial movement and rotation of the rod 14,
Motor that drives rotation and axial movement of rod 14
Encoder that detects the position of 17, 18 and inspection sensor 13
19, a lifter 20 for aligning the inspection sensor 13 with the axis of the center hole 2, a free table 21, an inspection sensor driving device 23 having an adjustment handle 22, and a driver 24 for sending signals to the motors 17 and 18. A controller 25 for controlling the motors 17 and 18; a camera controller 26 for controlling the CCD color camera; and an ultrasonic flaw detector 27 for transmitting and receiving ultrasonic waves.
A processor 28 for processing / determining test data and storing data, and a video tape 29 for storing video,
It comprises a video printer 30 for copying an image display, and a printer 31 for printing the inspection result and embossing it on recording paper.

Next, the structure of each part will be described in detail. Since the turbine rotor 1 is fixed, the lifter 20 is provided with wheels 32 so as to be able to move itself, and fixed legs 33 for fixing the lifter 20 at a predetermined position, and for raising and lowering the fixed legs 33 up and down. A ratchet lever 34 is provided.

The moving table 16 is supported and guided by a guide rail 35. The guide rail 35 is attached to the base 36. The base 36 is an axis driven by the level adjustment handle 22.
It is attached to the free table 21 via 37. A guide 38 is attached to the end of the base 36 as shown in FIG. 2, and slidably supports a positioning slide plate 39.

The positioning slide plate 39 has a positioning notch plate 40 attached to an end thereof, and is provided with an elongated hole 41 along the longitudinal direction. As shown in FIG. 3, a bolt 42 is passed through the long hole 41 from below. The bolt 42 further penetrates the base 36, and the fixing nut 43 is screwed on the upper surface of the base 36. In addition, since the inspection sensor 13 and the like are arranged at the upper part of the positioning notch plate 40, an arc-shaped notch portion 40a is provided.

On the upper surface of the lifter 20, a plurality of pneumatic floating ball bearings 44 shown in FIG. When the compressed air is supplied to the pneumatic levitation type ball bearing 44, as shown in FIG.
Is operated to exhaust the compressed air, the free table 21 is lowered and fixed as shown in FIG.

As shown in FIGS. 7 and 8, the movable base 16 is provided with projections 45 at four lower corners, and the projections 45 are connected to guide rails.
35 is slidably supported. The moving mechanism 46 of the moving table 16
Is a female screw 47 attached to the center of the lower part of the carriage 16 and a base
A feed screw shaft 48 rotatably supported by 36 and threadedly engaged with a female screw 47 is driven by the motor 18 via a belt mechanism. On the other hand, the rotation of the rod 14 is performed by rotating a shaft 16a rotatably attached to the movable base 16 so as to be connectable to the end of the rod 14 from a motor 17 via a belt mechanism.

The inspection sensor 13 has a CC as shown in FIG.
A CCD color camera head 11A having a D color camera 11 built in at one end of a short rod 14a and a composite ultrasonic probe 12 having compressed air at one end of a short rod 14b as shown in FIG. The composite ultrasonic probe head 12A includes a composite ultrasonic probe head 12A attached via an arm 49 that is opened by supply, and is configured to be replaceable.
When the arm 49 is opened, the guide roller 51 comes into contact with the center hole 2 with the pin 50 at the tip as a fulcrum, and the composite ultrasonic probe 12 is brought into close contact with the center hole 2 so as to be parallel thereto. A plurality of probes for inspecting ranges having different depths and angles so as to be able to inspect the defect at one time are combined. The other ends of the short rods 14a and 14b are provided with connecting mechanisms and terminals described later so as to enable connection with the main rod 14.

The rod 14 is configured to connect a plurality of divided rods. The connecting mechanism cuts out the upper half or the lower half so that the shaft ends to be connected can be connected as shown in FIGS. 11 and 12, and includes guide pins 52a, 52a protrudingly provided on one side. The key 53 is inserted and fixed after being fitted into the holes 52b provided on the other side. At the shaft end, connection terminals of a connector 54, a couplant supply pipe 55, and a compressed air pipe 56 are provided so as to be connectable to each other. Needless to say, the connector 54, the couplant supply feeling 55, and the compressed air pipe 56 extend through the rod 14 and extend from one end to the other end. In the inside of the moving table 16, a power supply and a signal to be transmitted to the inspection sensor 13 via the rod 14, an inspection data signal obtained from the inspection sensor 13, a couplant and an arm 49 to be transmitted to the composite ultrasonic probe 12 are provided. A connecting portion that allows the compressed air or the like to be sent and received even when the rod 14 rotates is attached between the shaft 16a and the moving base 16.

As shown in FIG. 13, the pantograph-type support 15 is mounted between fixing rings 57a and 57b fixed to the rod 14, and includes a spring 58, an adjusting rod 59, and a rod 14.
Three movable rings 60 mounted movably in the axial direction
a, 60b, and 60c, and a plurality of link mechanisms 61 including links that are rotatably mounted at opposite ends to opposing movable rings 60b and 60c via pins, and that are refractively connected at intermediate portions through the pins. And a roller 62 rotatably attached to a pin at an intermediate portion, and ball bearings 64 installed between adjacent movable rings 60a and 60b and between a fixed ring 57b and an movable ring 60c, respectively. And adjustment rod
59 opens the rod 14 so that it can follow the movement of the rod 14 in the axial direction without being rotated even if the rod 14 rotates. The roller 62 contacts the inner surface in the center hole 2 and rolls when the rod 14 moves in the axial direction.

Next, the operation of the embodiment configured as described above will be described. In the inspection procedure using the CCD color camera 11 used for visual inspection and magnetic particle inspection inspection, first, the lifter 20 is set so that the center hole 2 of the turbine rotor 1 and the center of the CCD color camera 11 coincide. This set brings the lifter 20 closer to the turbine rotor 1 as shown in FIG. In this case, the degree of the approach is as follows: the fixing nut 43 shown in FIG. 3 is loosened, the positioning slide plate 39 is drawn out along the guide 38 the longest, and the tip of the positioning notch plate 40 is brought close to the turbine rotor by the approach of the lifter 20. The positioning slide plate 39 is slightly pushed in contact with the position 1, and accurate positioning is not required. In this state, the ratchet lever 34 is operated to extend the fixed leg 33 and fix the lifter 20.

Thereafter, the CCD color camera 11 connected to the rod 14 is accurately centered with respect to the center hole 2.
This centering is performed by first positioning the CCD color camera 11 in the center hole 2.
Is lifted to almost the center by the lifter 20, and then the level adjustment handle 22 is operated to perform centering in the vertical direction and the vertical angle direction. Next, compressed air is supplied to the pneumatically levitated ball bearing 44 to operate the free table 21. With the free table 21 activated, the pantograph support 15
The free table 21 is moved in the front, rear, left, and right directions when the rod 14 with the is mounted on the center hole 2 to perform automatic alignment.
Thereafter, when the compressed air is exhausted, the free table 21 is fixed to the pneumatically levitated ball bearing 44. As described above, the CCD color camera 11 can be accurately centered with respect to the center hole 2.

Next, the operation of the moving table 16 for moving and rotating the CCD color camera 11 and the rod 14 is controlled. here,
The moving amount of the moving table 16 can be controlled by the controller 25 to a minute amount. Further, the rotation speed of the rod 14 can be controlled by the controller 25 to a minute amount. Therefore, necessary data is input from the processor 28 in order to control the operations of the moving table 16 and the rod 14. According to the instruction from the processor 28, the moving base 16 and the rod 14 are
Moves and rotates, so that the CCD color camera 11 connected to the distal end also advances in the center hole 2 while performing the same operation. The image captured by the CCD color camera 11 is displayed on the monitor 63 via the camera controller 26, so that the inspector observes the image.

When a flaw is detected, a cursor for measuring the size of the flaw is displayed on the screen of the monitor 63 in accordance with an instruction from the processor 28, and both ends of the flaw which cannot be moved are indicated by X.
When the distance sandwiched between the axis and the Y-axis direction is sent to the processor 28, the processor 28 storing the reference distance in advance calculates the size of the flaw and displays it on the screen of the monitor 63. The recording of the display screen is printed by a video printer 30 and further stored on a video tape by a video tape recorder 29. CC
The position and angle of the D color camera 11 are displayed on the monitor 63 screen by the processor 28 receiving a signal from the encoder 19.

Next, the inspection procedure using the composite ultrasonic probe 12 used for the ultrasonic inspection is performed by removing the CCD color camera head 11A connected to the tip of the rod 14 without changing the set of the driving device. Attach the ultrasonic probe head 12A. Next, necessary data is input from the processor 28 to control the operation of the moving table 16 and the rod 14 for moving and rotating the composite ultrasonic probe head 12A. The moving table 16 and the rod 14 move and rotate in accordance with the input conditions according to the instruction from the processor 28, so that the composite ultrasonic probe head 12A connected to the tip also performs the same operation and moves through the center hole 2. Go slowly. Composite ultrasonic probe 12
When a flaw is detected, the ultrasonic flaw detector 27 receives the signal and sends a signal indicating the depth of the flaw detected and the strength of the reflected wave to the processor 28 for each probe. At the same time, position and angle signals are sent from the encoder 19 to the processor 28 for each probe, and the signals are calculated and displayed on the screen of the monitor 63 which is also used as a television monitor. Recording of the display screen, and print a video printer 30, further performs the drawing of launch and defect status of the data in the printer 31. The flaw detection conditions and flaw detection results are stored in the processor 28.

[0025]

As described above, according to the present invention, in the inspection of the center hole of the turbine rotor, a series of operations from the conventional manual operation to the inspection operation, record creation, judgment, and data storage are performed. Can be replaced by an inspection sensor and a processor, so that the working time and labor required for the inspection operation can be greatly reduced.

In addition, it is possible to eliminate human error such as calculation error or transcription error at the time of record creation, and to save and reproduce inspection data. The differences can be superimposed and compared, and the reliability of the inspection can be greatly improved.

Further, by using a composite ultrasonic probe in which probes having different inspection areas are combined as an internal inspection sensor, the same results as those obtained by performing a plurality of inspections by one inspection can be obtained. Therefore, the work time and labor required for the inspection work can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of a base and a positioning slide plate used in one embodiment of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a perspective view of a pneumatically levitated ball bearing used in one embodiment of the present invention.

FIG. 5 is a side view showing the position of the free table when the pneumatic levitation type ball bearing shown in FIG. 4 is attached to a lifter and compressed air is supplied.

FIG. 6 is an explanatory diagram showing the position of a free table when compressed air is exhausted from the pneumatically levitated ball bearing shown in FIG. 4;

FIG. 7 shows a moving table and a moving mechanism used in one embodiment of the present invention;
FIG. 4 is a perspective view showing a rotation mechanism.

FIG. 8 is a plan view showing a configuration of a lower portion of the moving table, a guide rail, and a feed screw shaft shown in FIG. 7;

FIG. 9 is a side view of a CCD color camera head incorporating a CCD color camera used in an embodiment of the present invention.

FIG. 10 is a side view of a composite ultrasonic probe head to which the composite ultrasonic probe used in one embodiment of the present invention is attached.

FIG. 11 is a perspective view showing a configuration of an end portion of a rod used in one embodiment of the present invention.

FIG. 12 is a side view showing a state before connecting the ends of the rods used in one embodiment of the present invention.

FIG. 13 is a side view of a pantograph-type support used in one embodiment of the present invention.

FIG. 14 is an explanatory diagram showing the operation of one embodiment of the present invention.

FIG. 15 is a side view of a conventional borescope apparatus for inspecting a surface portion of a center hole of a turbine rotor.

FIG. 16 is a configuration diagram of a conventional ultrasonic inspection device for inspecting the inside of a center hole of a turbine rotor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Turbine rotor, 2 ... Center hole, 11A ... CCD color camera head, 12A ... Composite ultrasonic probe head, 13 ... Inspection sensor, 14 ... Rod, 15 ... Pantograph type holder, 16
... Mounting table, 17,18 ... Motor, 20 ... Lifter, 21 ... Free table, 23 ... Testing sensor drive, 24 ... Driver, 25
... Controller, 26 ... Camera controller, 27 ... Ultrasonic flaw detector, 28 ... Processor, 29 ... Video tape recorder, 30 ... Video printer, 31 ... Printer, 35 ... Guide rail, 36 ... Base, 39 ... Positioning slide plate, 40 ... Positioning notch plate, 44 ... Pneumatic floating ball bearing, 47 ... Female screw, 48 ... Feed screw shaft, 52 ... Guide pin, 53 ... Connector, 54 ... Key, 55 ... Coupling material supply pipe, 56 ... Compressed air pipe,
57a, 57b: fixing ring, 58: spring, 59: adjusting rod,
60… Movable ring, 61… Link mechanism.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G01M 19/00 F01D 5/02 G01N 21/88 G01N 29/26 501-503

Claims (1)

(57) [Claims] Claims: 1. A turbine rotor which can be inserted into a center hole of a turbine rotor.
And an inspection sensor which enables exchanging the CCD camera and the composite ultrasonic probe, can move the test sensor horizontal and vertically, and a test-sensor drive having a rotatably mounted to the lifter, the test sensor Attached to the drive,
A plurality of motors for moving and rotating the inspection sensor, a driver for sending a signal to each of the motors, a controller for controlling the operation of each of the motors, and a position at which an inspection signal is generated in an internal inspection using a composite ultrasonic probe. from the in terms of magnitude performs determination of the flaw and a processor for storing these data, a video recorder that is stored as it is an image of flaws in the surface portion inspection by the CCD camera, a printer for printing the data A center hole inspection device for a turbine rotor, comprising: