JPS6341604A - Turning equipment - Google Patents

Abstract

PURPOSE:To prevent the nonconformance of engagement between two gears from occurring, by engaging them at such charging timing that a crest and a root of each tooth of these gears are engaged right with each other when a turning gear is charged to an axial gear and engaged together. CONSTITUTION:This turning equipment is provided with a gear charging mechanism 20, a turning control circuit 40 and a gear charging controller 50. The gear charging mechnism 20 makes turning charging gear 25 engage an output gear 23 on an output shaft 22 of a turning motor 21 via a reduction gear mechanism 24, and it rotates supporting frame 26 with turning operation of a charging operating lever 27, thereby rocking the gear 25. And the gear charging controller 50 outputs a charging operation signal when detecting such charge timing that the charging gear 25 and an axial gear 28 are engaged right with each other, while the turning control circuit 40 receives the charging operation signal at the time of turning operation, driving the gear charging mechanism 20, and both these gears 25 and 26 are engaged with each other.

Description

Detailed Description of the Invention [Object of the Invention] (Industrial Application Field) The present invention relates to a turning device for performing turning operation of a turbine such as a steam turbine. The present invention relates to a turning device that properly meshes with a shaft gear of a turbine shaft.

(Prior Art) In general, a steam turbine is driven by high-temperature, high-H steam, rotates at high speed to perform work, and is operated to avoid driving a generator.

When stopping the operation of a rotationally driven steam turbine, close the shutoff valve "r" in the steam turbine section to stop the supply of driving steam to the steam turbine.
1■ To stop the operation of the steam turbine.

When the steam turbine stops operating 1-, the rotational speed of the turbine shaft of the steam turbine gradually decreases, and V) naturally increases to f.
However, since the turbine shaft is heated by high-pressure steam during operation of the steam turbine, it is in a high temperature state at t-: 115 when the turbine 11 naturally stops.

This turbine shaft! '-! If case 11 is left in the WIA state, the turbine shaft will bend due to the shaft self-inflation, contact will occur between the stationary part of the steam turbine and the lj col Φ input part, and rotational imbalance will occur in the turbine 1111 itself. In some cases, there was a risk that the restart of the steam turbine would be impossible.

Therefore, when stopping the operation of the C1 steam turbine, the steam turbine is rotated at a low speed of, for example, 5 to 10 rpm Pi] until the temperature of the turbine shaft is lowered to a predetermined temperature by a turning device, and then the steam turbine is stopped.

This type of conventional turning device is illustrated as shown in FIG. 2, and includes a gear 17 closing mechanism 1 and a turning control circuit 2 for controlling the operation of the gear A7 closing mechanism 1.

The gear A7 input mechanism 1 engages the turning input gear t6 with the output 1'-pano 4 attached to the output shaft of the turning king 3 via the reduction gear 117 mechanism 5, and rotates. The inner turning input gear A76 is input into the rotating shaft gear 8 by operating the input operation lever 7, and these two gears 6.8 are removably engaged.

The shaft gear 8 is fixed to a turbine shaft 9 of a steam turbine (not shown), and rotates until the steam turbine comes to a natural stop.

The above-mentioned feeding bamboo control bar 7 [31 spout △ rotates around [
], and its free end is the gear for turning! (When selling 3, it is connected to the A7 acquisition frame 6a.
On the side, branch levers 7a and 7b of 1 are provided.

When the balance way 1-10 is installed on the branch lever 7a of the first lever, the piston 1a from the operation cylinder 11 is placed on the other branch lever 7b.
6. Waiting for the operation of the operation cylinder 11, the operation lever 7 for input is simultaneously moved around the fulcrum △. Simultaneously moved around Sada 13, μ, for turning input ↓゛Meshing 1 position where N76 meshes with shaft gear ＼18, and meshing E at -
! The departure position where is released
There is 1-)C. 1. The driving of the operation cylinder 11 is controlled by the switching operation of the electromagnetic valve 12, and is controlled by the switching operation of the electromagnetic valve 12 (or the operation from the turning control 11 circuit 2 32F). 35. L, Ta, Ku Ling control circuit 2
Turning [- output operation jin S+82b on evening 3,
It controls the driving of Turning Tanabata 3.

- On the other hand, when the stopped steam turbine starts operating, the rotational speed of the steam turbine is gradually accelerated, and when it reaches a predetermined rotational speed, the turning input gear that has been meshed with the shaft J' V2O is turned. ) 16 is fJ of repelling due to centrifugal force
It's a bit of a bite! It retreats from the position F/ to the position 1llll [Ili, and the meshing with the shaft gear 8 is released, making it possible to prevent vibrations caused by the fan balance of the turbine shaft 9 during high-speed rotation.

At this time, the turning input 1' 176 is held at the detached position by the balance way 1-10.

On the other hand, when the steam turbine in operation is to be stopped for 1J, turning operation is performed to perform turning operation of the steam turbine.

That is, the shutoff valve in the steam turbine section is closed to continuously cut off the inflow of steam, and the rotational speed of the steam turbine is gradually reduced.

The low rotational speed of the steam turbine is supervised by the operation L1, and when the rotational speed of the turbine @9 reaches a predetermined value (IJ),
The turning control circuit 1 is operated downwardly by the turning control circuit 11, or the turning control circuit 2 is automatically operated by, for example, a speed detection device for detecting rotational stray current of the turbine shaft 9.

For this IC, an operation signal S2 is sent from the turning control circuit 2.
a and S2b are applied to the turning motor 3 and the solenoid valve 12, the closing operation lever 7 is automatically operated, and the gear A7 support frame 6a that supports the turning input gear 6 rotates around the fulcrum B, and the turning input operation lever 7 is automatically operated. Gear 6 is introduced into rotating shaft gear A78 and meshed with it, and the steam turbine then enters turning operation.

(Problems to be Solved by the Invention) However, in such a conventional turning device, when the turning input gear 6 is input to the shaft gear 8, each gear 176.8 rotates at a different speed. , there is a risk that the closing timing of this turning input gear A76 may be incorrect, and once this timing is incorrect, the peaks and valleys of the teeth of both gears 176.8 may not mesh properly, and for example, the teeth of the gears 176. Inappropriate meshing may occur, such as when the teeth try to mesh with each other.

If the meshing is inappropriate as described above, there is a risk of damage to the teeth of the turning input gear 6 and shaft gear 8, and if these are damaged, it will take a lot of effort and cost to repair them. It takes.

In addition, if the steam turbine continues to operate at high speed while overlooking defects that have occurred in the shaft gear 8, etc., the shaft unbalance will increase and cause vibrations, causing serious damage to the steam turbine itself. There is a fear.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a turning device that can input a turning input gear at a timing that allows the turning input gear and shaft gear to mesh correctly.

(Structure of the Invention) (Means for Solving the Problem) The present invention solves the problem of the conventional example by detecting the turning timing at which the turning input gear and the shaft gear engage correctly at their engagement u <* W4. For turning input without
This was done in view of the fact that the Y-ya is input into the axis-V-yah, and is configured as follows.

A turning input gear rotationally driven by a turning motor is attached to a shaft gear fixed to a turbine shaft.
A gear input mechanism that engages and engages removably and this gear input Ia
In a turning device having a turning control circuit for controlling the operation of a turning mechanism, a closing operation signal is generated when the turning closing timing is detected when the turning closing gear and the shaft gear are correctly engaged with the peaks and troughs of the teeth at their meshing positions. It has a gear input control device that outputs
The turning control circuit receives the input operation signal (2) and drives the gear input mechanism to drive the turning input gear X.
7 was put into the shaft gear.

(Function) When the turning operation is performed in the turning control circuit when the turbine operation is stopped, the gear closing control device is activated.

Therefore, when the gear engagement control device detects the engagement timing where the peaks and troughs of the teeth of both gears are correctly engaged at the engagement position where the turning engagement gear and the shaft gear engage, the engagement operation signal is set to the turning engagement position. given to the control circuit.

Upon receiving the closing operation signal, the turning control circuit automatically operates the closing operation lever to load the turning input gear onto the shaft gear.

As a result, the turning input gear is correctly engaged with the shaft gear at the time of input, and various problems such as damage to both gears caused by improper engagement can be solved, and the turning operation of the turbine can be improved. It can be done safely.

(Actual flow example) An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 shows the overall configuration of an embodiment of a turning device according to the present invention, and the wood embodiment is '1', center input tIIm
20, the turning control circuit 40, and the gear engagement control AV device 50.

The gear input machine tfI420 is attached to the output shaft 22 of the turning motor 21. In 1723,
Turning input gear N7 via reduction gear T7m structure 2/1
25 is engaged μ, and 1 for this turning input! t
2 E5 and the reduction gear r24a that meshes with it are supported by the support frame 26 so as to be rotatable around the fulcrum C. The support frame 2G supports the white end of the operating lever 27 for officials C3, and the operating lever 27 for input is supported at the fulcrum 1.
) The support frame 26 is supported so as to be movable at the same time as 1JA, and by rotating the input operation lever 27, the support frame 26 is moved to the fulcrum O.
It rotates rapidly and is used for turning. 25 pieces of 'Kan' are used! :l i? F and engagement 1! Ii7 There is J, sea urchin ITC, who moves forward and backward between the places.

The meshing position is IN, and the turning input gear 1725 is the shaft gear A.
There is 1d where the gear 28 engages, and the 1' gear 25 for turning input is I! ill
Get out and release the -C engagement 1! The shaft 1゛jno2ε3 is in the same position as the turbine shaft 2 of the 4f steam turbine. Branching lever 27 i of the east corner stone [branched into two, Dano-I]
Balance ways 1 to 30 are attached to l, and the other branch lever 27b is attached to screw 1 and rod 3 of operation cylinder 31.
1a will be contacted. The operating cylinder 31 is a spring 31
), and by driving the operation cylinder 31, the operation lever 27 is rotated counterclockwise around the fulcrum 1) against the spring force of the spring 31b, and the support frame 26 is rotated around the fulcrum 1). ) around the mouth counterclockwise,
The turning input gear) 725 is brought closer to the turning gear 1728 so that it can be matched with ll1iJ.

On the other hand, the gear 1725 for inserting gear 1725, which engages with the shaft gear 28, is repelled by the centrifugal force due to the high speed rotation of the shaft gear A728, the rotation of the turbine, and the operation of the turbine. Begins to retreat from position to disengagement position.

The driving of the operating cylinder 11 is controlled by the switching operation of a solenoid valve 32 that supplies air at a predetermined pressure.
The switching operation is controlled by the operation signal S40a received from the turning control circuit 40.

Turning control circuit/IO is turning operation input operation 1
but? ``'i <r 11') Nekdoki, manipulation f1 i, i
j3 S /I Oa wo? LJ to Tffi magnetic valve 32
Switch the C switch, drive the operating cylinder 314, \l! J
In addition, the turning control circuit 40 turns the operation signal 40b to -921.
This turning control circuit/IO has a tartar
- Detecting the timing for inserting 1” S725?
The input control device 50 is installed (113).
This t''s-'2 input control rule (11 I E) 0
is for turning input 1''-Al1 lidosuke~・28 to 2 systems that respectively detect each rotation speed,) to 3, 1
3-speed play detection sensor (t-41Fl, /l 1t-:
There is a different theory for +.

These △, [3rd speed fUI = N! f-41a, 4l
b Each system △, B fu Δ, 13 preamp/12
a, /12b respectively, Δ, B speed hemp detection device /
I3a.

4,','! , bdoA, l', gi\) Mountain and valley discrimination HR
'? 44a and 44b are connected to the -If>111 circuit by -f and l'lε.

△, 13-speed wear detection equipment 43ε1. /13b is A, 13p)'Reso 42a, △, [3
Speed = 12 Once the speed signal is received from the sensors 41a and 41b ('C1
The rotational speeds of the turning input gear 25 and the shaft gear 26 are detected, and these inspection signals are sent.

513b is input to the input control circuit 45.

Also, △, B1! Ya mountain/valley discriminator N44a, 'I'lb
receives the speed signals from the A and B speed wheels 1--41 a and 41 b, and connects the turning input gear 25 and the top of the peak and the bottom of the valley of both teeth of the shaft gear t2B. Pulse signals 544a and 544b, which have opposite polarity to the bottom, are applied to the gear A7 closing control circuit/15.
The I part outputs il job pulse and the bottom of the tooth valley outputs 0 pulse.

=1- The V input control circuit 45 is configured as follows.

That is, the 1-hair 7 input control circuit 715 converts the speed detection signal S'13a from the Δ speed peak detection device/43a and the pulse signal 544a from the gear peak/valley discrimination device 44a to Vx.
'=J, calculate whether the shape of the teeth of the turning input gear A725 to be pushed after the turning input gear A725 advances to the meshing position with the shaft gear V28 is, for example, 111, an angle or a valley. do.

Similarly, the gear engagement control circuit 45 receives the speed detection signal S 43 b from the B speed peak detection device a 43 b and the pulse signal 544 b from the B gear peak/trough discrimination device 44 b, It is calculated whether the shape of the teeth of the shaft gear 28 at the meshing position with the gear 1725 is, for example, a mountain or a valley.

Comparing the tooth shapes of both gears 725 and 28 in J5 at the meshing position n of both gears 25 and 28 performed in this way, for example, when meshing correctly between valleys and peaks or peaks and valleys, 13
1. Assuming that the closing timing is detected, the closing operation signal s45 is sent from the gear closing control circuit 45 to the turning control circuit 4.
To 0! 1, this injection timing is the following method C
Detected.

In other words, the gear engagement control circuit 45 detects the speed '4
S 433 a 63 and pulse signal S”r S 44
Receive each a, turn input 1: A' 2
After 5 advances to the shaft gear until it engages with 728 at the U position, a
3, it is calculated whether the teeth of the 'ti111' gear 28 at the meshing position are crests or troughs, and this is converted into numerical values, for example, with crests as 2, troughs as 0, and others as 1.

Similarly, it is calculated whether the teeth of the turning input gear 25 at the meshing position with the shaft gear 28 are crests or troughs, and are converted into numerical values, for example, with crests as 2, troughs as Ol, and others as 1.

Then, the gear input control circuit 45 continuously compares the numerical values of the turning input gear 25 and the shaft gear 28 using a comparison circuit, and when the absolute value of the subtraction between the two values is, for example, 2, , turning input gear r25 shaft gear 28
Since the teeth of both gears ψ25.28, which are in the zero meshing position, are in a state where they are correctly engaged with the peaks and valleys, the closing operation signal S45 is controlled by the gear closing control circuit 45 at the closing timing. applied to circuit 40.

Next, the operation of this embodiment will be described.

When the operation of the steam turbine is stopped, the rotational speed of the steam turbine gradually decreases, and when the rotational speed (a) reaches a predetermined value, the operator manually activates the turning operation of the turning control circuit 40. Let's do it.

Alternatively, a reduction in the rotational speed of the steam turbine to a predetermined value may be detected by, for example, a zero speed detection device (not shown), and the turning operation of the control circuit 40 may be automatically performed based on this detection signal. .

When the turning control circuit 40 is driven, the control circuit/1.
The operation signal S/IOb of OLu is 1. The input mechanism 20
is applied to the turning motor 21 to start it.

As a result, the rotational force of the output gear 23 is reduced by the reduction gear 17 mechanism 24.
is transmitted to the turning input gear 1) 25 via the
This is rotated and driven by the flood.

The rotational speed of this turning input 1j 4725 is detected by the A stray electricity detection device 43a that receives the speed detection signal from the Δ speed lens +J-41a, and this speed detection "?r S A 3 a In addition to the gear input control circuit 45, this 1゛A7 input control circuit 45 has a
From the gear 111 valley discrimination device hM A 4 a, the peaks and valleys of the teeth of the turning input 1゛＼72F are each given small pulses (M number S 44 ah<) with pulses of opposite polarity.

On the other hand, due to the shutdown of the steam turbine, the turbine shaft 29
The rotational speed of the shaft gear 1728 fixed to the turbine shaft 29 gradually decreases.

At this time, the decrease in the rotation speed of the shaft gear 28 is detected by the B speed detection device/13b upon receiving the detection signal from the B speed sensor 1, 1--41b, and the rotation speed detection signal 5 is detected by the B speed detection device/13b.
43b to the gear engagement control circuit 45.

Further, a pulse signal 544 which indicates the peaks and valleys of the teeth of the shaft gear 28 with pulses of opposite polarity is sent from the B gear peak and valley discriminating device 544b.
a to the gear engagement control circuit/I5.

Then, the gear input control circuit 45 is set to △, B speed detection device ff
Speed detection signal S from fJ 43 a, 43 b
43a, 543b, △, B gear discrimination equipment 44
a.

44,b from the pulse signal S44.44.b. a, 544b, detects the rotational speed of the turning input gear 25 and the shaft gear 28, and turns the turning input gear 25 into the shaft gear A.
After moving forward to the engagement position with 728, it detects the closing timing at which the engagement between both gears 1725 and 28 is correct with the peaks and troughs, and when this timing is detected, the closing operation Shinni S 45 is applied to the turning control circuit 40.

Therefore, the turning control circuit 40 sends an operation signal S=1 to the solenoid valve 32. Oa is changed, the solenoid valve 32 is switched, air is supplied to the operating cylinder 31, and the operating lever 27 is controlled by the operating cylinder 31, and the spring 31b is
Rotate the automatic operation lever 27 around one fulcrum against the spring force of fl'L, approach the gear 28, insert the turning input gear 25 into the shaft gear 28, and turn the steam turbine. Avoid starting turning operation.

The turning input gear A 25 is turned on the turning input gear \725 and the axis 4! At the engagement position with 1728, the teeth stop at the valley of 111 and the engagement timing is done, so the 1" A 25 for turning
is correctly meshed with shaft gear V28, but due to improper meshing, tooth 1 of both gears 1725.28? It is possible to prevent J-scarring and safely perform turning operation of the steam turbine.

〔Effect of the invention〕

As explained above, in the present invention, when the turning input gear is inserted into the shaft gear and engaged, the gears are engaged at the input timing when the peaks and valleys of the teeth of both gears mesh correctly, so that the turning input gear A7 Inappropriate meshing between the gear and the shaft gear can be prevented, and damage to teeth due to improper meshing of these gears can be prevented, allowing safe turning of the steam turbine.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the overall configuration of an embodiment of a turning device according to the present invention, and FIG. 2 is a block diagram showing the overall configuration of a conventional example. 21... Turning motor, 25... Turning gear 17.27... Turning operation lever, 28...
Shaft gear, 31... operating cylinder, 32... solenoid valve,
40...Turning control circuit, 41a...A speed detection sensor 1 NO, 41b...13 Speed detection sensor 4 NO,
43a...A speed detection device, 43b...B speed detection device, 44a...A gear peak/valley discrimination device, 44. b
...[31-7 peak/valley discrimination device, /1.5...gear engagement control circuit, 5o...1゛A7 engagement control deviceffi
n

Claims (1)

[Scope of Claims] 1. A gear closing mechanism that releasably engages a turning gear rotationally driven by a turning motor with a shaft gear fixed to a turbine shaft, and a turning mechanism that controls the operation of this gear closing mechanism. In a turning device having a control circuit, a gear closing control device outputs a closing operation signal when detecting a closing timing at which the turning closing gear and the shaft gear properly mesh with the peaks and troughs of the teeth at their meshing positions. A turning device characterized in that, during turning operation, the turning control circuit receives the closing operation signal and drives the gear closing mechanism to close the turning gear to the shaft gear. 2. The gear input control device includes a speed detection device that detects the rotational speed of the turning input gear and the shaft gear, respectively;
A gear peak/trough discrimination device that discriminates the peaks and valleys of the teeth of the turning input gear and shaft gear, and a speed detection signal and a discrimination signal from the speed detection device and the gear peak/trough discrimination device, respectively, are received, and the turning input gear and shaft are detected. The turning device according to claim 1, further comprising a gear closing control circuit that calculates a meshing state at a meshing position with a gear and outputs a closing operation signal when it detects a closing timing at which both gears mesh correctly. .