JPH0581379B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a device for indexing and rotating a turbine wheel with respect to a machine in order to fix a shroud by fixing a blade tenon of the turbine wheel, and a device for rotating the turbine wheel by indexing it with respect to a machine. This invention relates to an indexing method using the device.

<Prior art> A shroud that connects a plurality of blades to each other is attached to the outer periphery of the blade of a turbine wheel, and the shroud is fixed to the blade using a tenon mechanism protruding from the tip of the blade. This is done by When installing the blade tenon of this turbine wheel, the turbine wheel is mounted on the indexing device,
The blade tenons of the turbine wheel are sequentially indexed and fitted in relation to the position of the machine. Figures 8 to 11 show a conventional indexing device of this type, with Figure 8 being a partially cutaway front view of the main part, Figure 9 being a cross-sectional view of Figure 8, and Figure 10. 11 is a plan view thereof, and FIG. 11 is a cross-sectional view taken from FIG. As shown in FIGS. 8 to 10, in the conventional indexing device, the journal portions at both ends of the turbine impeller 11 are rotatably supported by rollers 13 provided on a roller stand 12, and the turbine blade is driven by a drive motor 14. The blade wheel 11 is rotationally driven to sequentially position the tenons 16 of the blades 15 installed in the turbine blade wheel 11 so that they are coaxial with the axis of the machine 17. On top of that, the heating device 18
At the same time, the Tenon 16
A blow is applied to the tenon 16 and the shroud 19 fitted therein is fixed.

Conventional indexing devices include Tenon detection sensors,
Based on this signal, the drive motor 14 is controlled to rotate and stop, and the drive motor 14 is sequentially rotated starting from the tenon 16 at the end.
7, and in Figure 11 Tenon 16-1, 16-2, ..., 16-
The machining process is performed in the order of 7. In addition, 1 in Figure 11
6-0 represents a tenon that has already been won.

<Problems to be Solved by the Invention> However, the conventional apparatus has the following problems.

(1) Due to the heating of the first tenon 16-1, the end of the shroud 19 comes into close contact with the wing 15, but due to the influence, the other end of the shroud 19
It stands out as shown by the chain line S in Figure 1.

(2) Shroud 19 stretches due to thermal expansion during processing, and when processing the final tenon 16-7,
There is a possibility that the tenon 16-7 will not fit into the hole in the shroud 19.

(3) As the machining progresses to the end of the shroud 19,
Shroud 19 hole pit and Tenon 16-1,
Errors from the pitches of 16-2, . . . , 16-7 are gradually accumulated. As a result, it causes an unbalance of the impeller rotational moment.

(4) The spacing between each shroud 19 will be unequal.

It is an object of the present invention to provide a wing tenon position indexing device and an indexing method using the same that can solve these conventional problems.

<Means for Solving the Problems> The configuration of the blade tenon position indexing device according to the present invention to achieve this object is to fix a shroud that connects a plurality of blades of a turbine wheel to the blades. a rotational drive device for the turbine wheel;
A shroud attached to the outer periphery of a blade; a break detecting means for detecting a break between the shroud; a tenon detecting means for detecting a tenon at the tip of the blade; a rotation amount detecting means for detecting the amount of rotation of a turbine wheel; and the break detecting means and a memory means for storing a rotation amount signal of the turbine blade wheel by the rotation amount detection means from the time when the tenon detection means detects a break in the shroud until the time when the tenon detection means detects each tenon, and the rotation amount signal is stored in the memory means. and a control device that drives the rotary drive device based on the rotation amount signal of each tenon, and completes indexing of the turbine wheel by detecting the corresponding tenon by the tenon detection means. This is a characteristic feature.

Furthermore, the configuration of the blade tenon position indexing method according to the present invention is such that each tenon of the blade tip is positioned at a position of a machine for fixing a shroud that connects a plurality of blades of a turbine wheel to the blade. On the other hand, in the method of indexing the turbine wheel, each tenon position from the cut in the shroud is detected and memorized in advance, the tenon located in the center of the shroud is first indexed with respect to the rotor, and then The present invention is characterized in that the tenons located adjacent to each other on both sides of the tenon are sequentially and alternately indexed toward the end of the shroud.

<Operation> Therefore, in the device of the present invention, each tenon position from the cut in the shroud is detected in advance and stored in the memory means as a rotation amount signal of the turbine wheel. For indexing, a rotation amount signal corresponding to a desired tenon is selected from the rotation amount signals stored in the memory means, and the turbine blade wheel is indexed based on the rotation amount signal, and the tenon detection means corresponds to the corresponding tenon. The indexing is completed by detecting the tenon. Furthermore, by sequentially machining the indexed tenons according to the method of the present invention, it is possible to prevent the shroud from gradually shifting in one direction as the machining progresses.

<Example> Hereinafter, an example of the present invention will be specifically described with reference to the drawings.

1 to 7 show an embodiment of the device of the present invention, in which FIG. 1 is a partially cutaway front view of the main part, FIG. 2 is a cross-sectional view of FIG. 1, and FIG. is its plan view, Figure 4 is a cross-sectional view of Figure 1, and Figure 5 is a cross-sectional view of Figure 1.
The figure is an enlarged perspective view of the main part, FIG. 6 is an enlarged sectional view of the fitting portion between the blade and the shroud, and FIG. 7 is an overall block diagram.

1 to 7, a roller 22 that circumscribes and rotatably supports journal portions at both ends of a turbine wheel 21 is supported by bearings on a roller stand 23. As shown in FIGS. An AC servo motor 24 for driving a blade wheel is attached to the side surface of the roller stand 23, and the rotation of the AC servo motor 24 is transmitted to the roller 22 via a gear train (not shown) provided in the roller stand 23, and then to a turbine. The blade wheel 21 is rotationally driven. This AC servo motor 24 is controlled by a blade wheel indexing AC servo controller 46, which will be described later.
Further, a turbine impeller 21 is provided on the side surface of the roller stand 23.
A clamper 25 equipped with a ram for pressing and clamping the side surface of the disk is attached, and a limit switch 26 for detecting unclamping of the clamper 25 is also provided.

On the other hand, an optical fiber sensor 27 and a magnetic sensor 28 are arranged close to the outer circumference of the turbine wheel 21 . The optical fiber sensor 27 is attached to the outer periphery of a blade 29 embedded in the turbine wheel 21 . It is for detecting the cut 31 between the shrouds 30, and its detection end faces the side surface of the shroud 30, as shown in FIG. This optical fiber sensor 27 is supported by a tip bracket 34 of a rod 33 that is driven vertically by a cylinder 32, and when the rod 33 is located at the uppermost position, the detection end of the optical fiber sensor 27 is located on the turbine wheel 21. It is designed to reach the center height. Furthermore, limit switches 35 and 36 are attached to the cylinder 32 to detect the upper and lower end positions of the rod 33, respectively.

Further, the magnetic sensor 28 is for detecting the tenon 37 provided protrudingly from the tip of the wing 29, and is opposed to the tip surface of the tenon 37, as shown in FIG. This magnetic sensor 28, like the optical fiber sensor 27, is fixed by a set bolt 41 to the tip bracket 40 of a rod 39 that is driven vertically by a cylinder 38, and when the rod 39 is at the uppermost position, the magnetic sensor 28 sensor 28
reaches the center height of the turbine wheel 21. Furthermore, the cylinder 38 has a rod 39.
Limit switches 42 and 43 are installed to detect the upper end position and lower end position, respectively. The optical fiber sensor 27 and the magnetic sensor 28 are adjusted so that their relative positional relationship is always constant at their top positions.

A rotary encoder 45 for detecting the amount of rotation of the turbine wheel 21 is supported on one roller stand 23 via an arm 44, and the detection head of the rotary encoder 45 is opposed to the shaft end surface of the turbine wheel 21. The number of pulses is proportional to the amount of rotation of the turbine wheel 21.

As shown in FIG. 7, the control device includes an AC servo controller 46 for indexing the blade wheel and a control microcomputer 47, and the AC servo controller 46 includes the aforementioned limit switch 26 for detecting unclamping of the turbine blade wheel 21. , a signal from the optical fiber sensor 27 , a signal from the magnetic sensor 28 , a pulse signal from the rotary encoder 45 , etc. are input, and the tenon number is manually input using the key switch 48 .
The AC servo controller 46 has a memory means for storing the pulse signals of the rotary encoder 45, calculates the index control amount from each of the above signals, and calculates the index control amount from each of the above signals.
Controls the servo motor 24. In addition, the control microcomputer 47 transmits an index start signal to the AC servo controller 46, and a signal from the optical fiber sensor 27 transmitted as the turbine wheel 21 rotates.
While the signal from the magnetic sensor 28 is input, the AC
An indexing completion signal is received from the servo controller 46.

Next, an embodiment of the method of the present invention will be described together with the operation of the above-mentioned apparatus. First, teaching at the tenon 37 position is performed as follows.

(1) A teaching start signal is sent from the control microcomputer 47 to the AC servo controller 46.

(2) Then, the optical fiber sensor 27 and the magnetic sensor 28 are pushed upward by the cylinders 32 and 38 and positioned at the center height of the turbine wheel 21, and the cut 31 of the shroud 30 and the tenon 37 can be detected. becomes possible. At this point, signals from the limit switches 35 and 42 are output.

(3) In response to the signals from the limit switches 35 and 42, the clamper 25 is loosened and the turbine blade wheel 21 is
When the clamp is released, a signal from the unclamp limit switch 26 is output.

(4) The AC servo controller 46 receives the signal from the limit switch 26 and uses the AC for driving the blade wheel.
Power is supplied to the servo motor 24 to rotate the turbine wheel 21.

(5) When the turbine wheel 21 starts rotating, the optical fiber sensor 27 detects the cut 31 in the shroud 30 as the turbine wheel 21 starts rotating.

(6) When the AC servo controller 46 receives the cut 31 detection signal from the optical fiber sensor 27, the AC servo controller 46 starts counting pulses from the rotary encoder 45 attached to the end of the turbine wheel 21 from that moment on. Start.

(7) Subsequently, as the turbine wheel 21 rotates, the magnetic sensor 28 detects the first tenon 37-1 (see FIG. 4) from the cut 31.

(8) When the AC servo controller 46 receives the Tenon detection signal from the magnetic sensor 28, the AC servo controller 46 stores the pulse count of the rotary encoder 45 at that moment in its memory means. This number of pulses is shroud 30
This corresponds to the distance from the cut 31 to the first tenon 37-1.

(9) Furthermore, due to the rotation of the turbine impeller 21,
The magnetic sensor 28 sequentially connects the tenons 37-2, 37-
3, . Thus, the stored pulse numbers are transmitted from the cut 31 of the shroud 30 to the respective tenons 37-2, 37-3, . . . , 37-7.
Corresponds to the distance.

(10) When the last tenon 37-7 fitted into one shroud 30 is detected, the AC servo controller 46 cuts off the power supply to the AC servo motor 24 and stops the rotation of the turbine wheel 21. , the optical fiber sensor 27 and the magnetic sensor 28 are retracted downward to complete the teaching.

Next, the indexing operation is performed as follows.

(1) First, before starting the indexing, the order of the tenons 37 to be entered is input using the key switch 48 of the AC servo controller 46. In this embodiment, one shroud 30 has seven
The tenons 37-1 to 37-7 are fitted in the first tenon 37-4 located in the center of the shroud 30, and then the tenon 37-4.
4, and those located adjacent to both sides of the shroud 30 are alternately moved toward the end of the shroud 30.
In other words, Tenon 37-5, 37-3, 37-6,
37-2, 37-7, and 37-1 are input in this order.

(2) Then, the AC servo controller 46 calculates and stores the difference (incremental value) between the numbers of memory pulses of adjacent tenons in the input order.

(3) Subsequently, the control microcomputer 47 outputs an indexing start signal to the AC servo controller 46.

(4) Then, in the same way as during teaching, the optical fiber sensor 27 and the magnetic sensor 28 are pushed upward by the cylinders 32 and 38, respectively, and are positioned at the center height of the turbine wheel 21. and tenon 3
7 can be detected. At this point, signals from the limit switches 35 and 42 are output.

(5) In response to the signals from the limit switches 35 and 42, the clamper 25 is loosened and the turbine blade wheel 21 is
When the clamp is released, a signal from the unclamp limit switch 26 is output.

(6) The AC servo controller 46 receives the signal from the limit switch 26 and uses the AC for driving the blade wheel.
Power is supplied to the servo motor 24 to rotate the turbine wheel 21.

(7) When the turbine wheel 21 starts rotating, the optical fiber sensor 27 detects the cut 31 in the shroud 30 as the turbine wheel 21 starts rotating.

(8) When the AC servo controller 46 receives the cut 31 detection signal from the optical fiber sensor 27, the AC servo controller 46 starts counting pulses from the rotary encoder 45 from that moment, and the first Compare the number of memory pulses during teaching of Tenon 37-4.

(9) When the number of memory pulses and the number of count pulses match, the AC servo controller 46 stops supplying power to the AC servo motor 24 and outputs an index completion signal to the control microcomputer 47.

(10) On the other hand, when the magnetic sensor 28 detects the Tenon 37-4, it outputs the signal to the control microcomputer 47.

(11) The control microcomputer 47 uses the AND of the indexing completion signal from the AC servo controller 46 and the detection signal of the tenon 37-4 of the magnetic sensor 28.
(logical product) and outputs an index positioning completion signal.

(12) Upon receiving the index positioning completion signal from the control microcomputer 47, the clamper 25 is tightened to clamp the turbine wheel 21, and a signal from the limit switch 26 is output.

(13) Then, according to the signal from the limit switch 26, the optical fiber sensor 27 and the magnetic sensor 28
is retracted downward, and the first indexing is completed.

When the indexing of the tenon 37-4 of the turbine wheel 21 is completed, the tenon 37-4 is heated by the heating device 49.
The shroud 30 is fixed by heating it (550° C.) and tightening the tenon 37-4 using a tightening machine 50.
When this Tenon 37-4 is completed, Tenon 37-5, 37-3, 37-
6, 37-2, 37-7, 37-1 are determined as follows.

(14) The control microcomputer 47 issues an indexing start signal again.

(15) Then, this time the magnetic sensor 28
8, the tenon 37 can be detected and a signal from the limit switch 42 is output. In addition, the signal of the limit switch 35 of the optical fiber sensor 27 is the same as that of the previous indexing.
It is held as (4).

(16) Next, in response to the signal from this limit switch 42, the clamper 25 is loosened and the turbine blade wheel 21 is
When the clamp is released, a signal from the unclamp limit switch 26 is output.

(17) Next, the AC servo controller 46 receives this signal, determines whether the difference (incremental value) in the number of pulses with the next Tenon 37-5 is positive or negative, and then controls the AC servo motor 24. Power is supplied to rotate the turbine wheel 21 in a required direction.

(18) The AC servo controller 46 counts the pulses from the rotary encoder 45 accompanying the rotation of the turbine wheel 21, and compares the number of pulses with the stored increment value.

(19) When they match, the AC servo motor 24 is stopped and the turbine wheel 21 is clamped by the clamper 25, and then the magnetic sensor 28
is lowered to complete the second indexing.

After that, after the ceremony of Tenon 37-5, Tenon 37-3, 37-6, 37-
2, 37-7, and 37-1 are indexed and processed using the same procedure.

<Effects of the Invention> As described above in detail with reference to the embodiments, according to the device of the present invention, the blade tenons of the turbine wheel can be indexed and positioned with respect to the wheel in any order, and By first indexing the tenon in the center of the shroud, and then sandwiching that tenon and sequentially indexing the tenons located adjacent to each side toward the ends of the shroud,
It is possible to prevent the shroud from gradually shifting in one direction as the shroud fitting process progresses, and it is possible to eliminate the shift of the shroud.

[Brief explanation of the drawing]

1 to 7 show an embodiment of the device of the present invention, in which FIG. 1 is a partially cutaway front view of the main part, FIG. 2 is a cross-sectional view of FIG. 1, and FIG. is its plan view, Figure 4 is a cross-sectional view of Figure 1, and Figure 5 is a cross-sectional view of Figure 1.
The figure is an enlarged perspective view of the main part, FIG. 6 is an enlarged sectional view of the fitting portion between the blade and the shroud, and FIG. 7 is the entire block. 8 to 11 show a conventional indexing device, FIG. 8 is a partially cutaway front view of the main part, FIG. 9 is a cross-sectional view of FIG. 8, and FIG. Its plan view, FIG. 11, is a cross-sectional view taken from FIG. In the drawing, 21 is a turbine wheel, 24 is an AC servo motor, 27 is an optical fiber sensor, 28 is a magnetic sensor, 29 is a blade, 30 is a shroud, 31 is a cut, 37 is a tenon, 45 is a rotary encoder, and 46 is a blade. AC servo controller for car indexing,
47 is a control microcomputer, and 50 is a machine.

Claims (1)

[Claims] 1. Indexing the turbine wheel with respect to the position of a machine that fits each tenon at the tip of the blade in order to fix a shroud that connects a plurality of blades of the turbine wheel to the blade. The rotating device includes a rotary drive device for a turbine wheel, a cut detection means for detecting a cut between shrouds attached to the outer periphery of a blade, a tenon detection means for detecting a tenon at a blade tip, and a cut detection means for detecting a cut between shrouds attached to the outer periphery of a blade, a tenon detection means for detecting a tenon at a blade tip, and a cut detection means for detecting a cut between shrouds attached to the outer periphery of a blade. A rotation amount detection means for detecting the amount of rotation, and a rotation amount signal of the turbine blade wheel by the rotation amount detection means from the time when the break detection means detects a break in the shroud until the time when the tenon detection means detects each tenon. The rotary drive device is driven based on the rotation amount signal of each tenon stored in the memory means, and the turbine blade is driven by the tenon detecting means detecting the corresponding tenon. A wing tenon position indexing device comprising: a control device for completing indexing of a car. 2. In a method of indexing a turbine wheel with respect to the position of a machine for fixing each tenon at the tip of the blade in order to fix a shroud that connects a plurality of blades of the turbine wheel to the blade, the shroud is Detect and memorize each tenon position from the cut,
First, the tenon located in the center of the shroud is indexed to the machine, and then the tenon is held in between and the tenons located adjacent to each other on both sides are indexed alternately toward the ends of the shroud. A method for determining the position of a wing tenon.