CN110336427B - Method for jacking motor rotor of main coolant pump of nuclear power station - Google Patents
Method for jacking motor rotor of main coolant pump of nuclear power station Download PDFInfo
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- CN110336427B CN110336427B CN201910563788.XA CN201910563788A CN110336427B CN 110336427 B CN110336427 B CN 110336427B CN 201910563788 A CN201910563788 A CN 201910563788A CN 110336427 B CN110336427 B CN 110336427B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
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- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
Abstract
The invention relates to the technical field of nuclear power debugging and maintenance, and particularly discloses a method for jacking a motor rotor of a main coolant pump of a nuclear power station, which comprises the following steps of: step 1: confirming the initial state of the valve; step 2: adjusting the state of the valve to enable the rotor of the main coolant pump motor to be subjected to upward jacking force; and step 3: jacking up a motor rotor of the main coolant pump; and 4, step 4: the valve state is restored. The method has the advantages of high reliability, convenience and quickness in operation, shortened operation period, reduced collective radiation dose and reference significance for jacking or lifting modes of main pump motor rotors of power plants in the same row.
Description
Technical Field
The invention belongs to the technical field of nuclear power debugging and maintenance, and particularly relates to a method for jacking a motor rotor of a main coolant pump of a nuclear power station.
Background
When the oil temperature of a main coolant pump of a nuclear power station, namely a motor bearing chamber of a main pump, is less than 20 ℃, the condition for starting the main pump is not met, and lubricating oil is required to be heated by starting a top shaft oil pump. In order to avoid the phenomenon that the oil film is established due to the fact that the auxiliary bush is loaded when the jacking shaft oil pump is started for a long time, the rotor needs to be jacked up or lifted before the main pump is started. The jacking effect and the working period directly affect the safe and reliable starting and running of the main pump, if abnormity occurs, the equipment is directly damaged, and the state of the unit is restricted to be in an upward running state, so that the technical and skill requirements on the jacking operation of the motor rotor of the main pump are high.
According to the traditional operation method for jacking the main pump motor rotor, firstly, an upper cover of a bearing box at the top of the main pump motor is removed, then a special tool for lifting the main pump motor rotor is installed, and then an auxiliary ring crane lifts the main pump motor rotor. The conventional rotor jacking operation method has the following problems:
1. when the special tool for lifting the main pump motor rotor and the ring crane assist are used for realizing the lifting of the rotor, the alignment of the center of the rotor of the macroscopic motor and the ring crane point can be carried out only by naked eyes, and the accuracy cannot be ensured, for example, the central deviation such as the gap of the upper guide shoe, the verticality of the main pump electric rotor, the concentricity of the rotor and the stator of the main pump motor is large, the assembly quality of the main pump motor is seriously influenced, and the damage risk of equipment is increased;
2. the operation period is long, the whole rotor lifting operation process is complex, and the operation period at least needs 20 hours/3 machines;
3. a large amount of manpower and material resources are consumed, and at least 10-12 persons are required to cooperate with each other to carry out operation;
4. when the commercial nuclear power generating unit carries out the operation, the number of the operating people is large, and the time is long, so that the exposure dose of the operating group is higher.
Therefore, it is desirable to design a new operating method for jacking up the rotor of the main coolant pump motor of a nuclear power plant to effectively avoid or reduce the above problems.
Disclosure of Invention
The invention aims to provide a method for jacking a motor rotor of a main coolant pump of a nuclear power station, which can meet the operation requirement of jacking the motor rotor of the main pump.
The technical scheme of the invention is as follows:
a method for jacking a rotor of a main coolant pump motor of a nuclear power station comprises the following steps:
step 1: confirming initial state of valve
Ensuring that the nitrogen isolation valve, the high-low pressure leakage communicating valve A and the high-low pressure leakage communicating valve B are in a closed state, and the exhaust valve, the low-pressure leakage isolation valve and the high-pressure leakage isolation valve are in an open state;
at the moment, nitrogen cannot be injected into the parking seal through the nitrogen isolation valve, and the parking seal is not put into operation; the second-stage sealing leakage water of the mechanical seal is discharged through a low-pressure leakage isolation valve, and the third-stage sealing leakage water of the mechanical seal is discharged through a high-pressure leakage isolation valve;
step 2: adjusting the valve state to make the rotor of the motor of the main coolant pump receive upward jacking force
The high-pressure leakage isolation valve and the exhaust valve are closed, the nitrogen isolation valve is opened, and the operation, the shutdown and the sealing are carried out; at the moment, nitrogen is injected into the parking seal through the nitrogen isolation valve, so that the internal pressure of the parking seal is increased, and the motor rotor of the main coolant pump is subjected to upward jacking force of the parking seal;
and step 3: motor rotor jacking of main coolant pump
Adjusting the pressure of a loop system to slowly rise, reading a pressure value through a loop system pressure gauge to enable the pressure of the loop system to rise to 1.80Mpa, then gradually raising the pressure, observing readings of two dial indicators during the period, and taking the average value of the readings of the two dial indicators as a jacking height value of a monitoring motor rotor; when the jacking height value is larger than or equal to 0.10mm, stopping boosting operation on a loop system, and keeping the current state for 10 minutes to fully feed oil between the auxiliary thrust pad and the thrust disc of the main pump motor;
finally, the pressure state of the system is reduced by discharging the water of the primary loop system, and the pressure of the primary loop system is reduced to a pressure platform of 1.80 Mpa;
and 4, step 4: restoring valve state
Closing the high-low pressure leakage communicating valve A and the high-low pressure leakage communicating valve B in sequence, opening the low-pressure leakage isolating valve, closing the nitrogen isolating valve, opening the exhaust valve, exiting from parking and sealing, and then opening the high-pressure leakage isolating valve; at the moment, nitrogen in the parking seal is discharged through an exhaust valve, the parking seal is withdrawn from operation, second-stage sealing leakage water of the mechanical seal is discharged through a low-pressure leakage isolating valve, third-stage sealing leakage water of the mechanical seal is discharged through a high-pressure leakage isolating valve, so that the internal pressure of the mechanical seal is reduced, upward jacking force applied to a motor rotor of the main coolant pump is reduced or eliminated, and the motor rotor of the main coolant pump naturally falls;
and observing the reading of the dial indicator, monitoring the falling displacement of the main pump motor rotor, confirming that the indicator needles of the two dial indicators all return to the 0 position, and normally returning the main coolant pump motor rotor to the seat.
at the moment, high-pressure leakage water of the mechanical seal flows into a low-pressure leakage pipeline of the mechanical seal through the high-low pressure leakage communicating valve B and the high-low pressure leakage communicating valve A, so that the internal pressure of the mechanical seal is increased, and further the upward jacking force of a motor rotor of the main coolant pump is continuously increased.
The gradual pressure rise in the step 3 is 0.02Mpa every time the pressure is raised for 3 minutes.
And 3, regulating the pressure of the primary circuit system to slowly rise through the upper filling and lower discharging functions of the chemical volume control primary circuit system.
The invention has the following remarkable effects:
1) the reliability is high. The method disclosed by the invention is used in the jacking operation of the rotor of the main pump motor for nearly 30 times of overhaul in a nuclear power plant, the requirement of a jacking shaft is met, the starting and running states of equipment are good, no abnormity occurs, the problems that the assembly quality of the main pump motor is possibly seriously influenced by the traditional method for lifting the rotor of the main pump motor are effectively avoided, and the risk of equipment damage is greatly reduced.
2) The simple operation reduces the demand to the manpower. The jacking operation of the main pump motor rotor can be completed only by the mutual cooperation of two operating personnel in operation and machinery, the operation personnel cooperate with the action valve in the whole process, the machinery personnel cooperate with the dial indicator to monitor the jacking condition of the main pump motor rotor, and the total number of the operating personnel can be reduced from 10-13 to 4.
3) The working period is shortened. The operation time of jacking the 3 main pump motor rotors of a single unit is saved by about 95% in more than 50 hours, the jacking operation of the 3 main pump motor rotors can be completed simultaneously only in 2-3 hours, and the construction period waste caused by the special motor rotor lifting tool with multiple kinds of matching and repeated dismounting is reduced.
4) The collective radiation dose is reduced. During the commercial period of the nuclear power plant unit, the new method reduces the number of people in cooperation operation by 25 percent, reduces the working time by 5 percent and directly reduces the collective radiation dose by more than 98 percent.
5) The invention is characterized in that firstly, the operation and the shutdown are sealed, so that the pump shaft of the main coolant pump is subjected to upward jacking force of the shutdown seal; secondly, communicating a high-pressure leakage pipeline and a low-pressure leakage pipeline of the mechanical seal, so that the upward jacking force of a pump shaft of the main coolant pump is increased; and finally, the pressure of a primary circuit is adjusted to slowly rise through the upper filling and lower discharging functions of the chemical volume control system, so that the pump shaft of the main coolant pump is continuously increased by the upward jacking force of the primary circuit system until the motor shaft is jacked up, and the jacking and lifting device has reference significance for the jacking or lifting mode of the main pump motor rotor of the power plant in the same trip.
Drawings
FIG. 1 is a schematic diagram of the jacking of the rotor of the main pump motor according to the present invention.
In the figure: 1-a top shaft oil pump; 2-dial indicator; 3-a magnetic gauge stand; 4-nitrogen isolation valve; 5-an exhaust valve; 6-mechanical sealing; 7-a motor; 8-a motor rotor; 9-the middle minor axis; 10-parking sealing; 11-low pressure leak isolation valve; 12-high and low pressure leakage communicating valve a; 13-high and low pressure leakage communicating valve B; 14-high pressure leak isolation valve.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
The method for jacking the motor rotor of the main coolant pump of the nuclear power station is operated by adopting a jacking device, as shown in figure 1, the jacking device comprises a dial indicator 2, a magnetic gauge seat 3, a nitrogen isolation valve 4, an exhaust valve 5, a low-pressure leakage isolation valve 11, a high-pressure and low-pressure leakage communication valve A12, a high-pressure and low-pressure leakage communication valve B13 and a high-pressure leakage isolation valve 14.
The main coolant pump comprises a top shaft oil pump 1, a mechanical seal 6, a motor 7, a motor rotor 8, a middle short shaft 9 and a parking seal 10. Wherein, the bottom end of the motor rotor 8 is connected with the top end of the middle short shaft 9. The upper part of the parking seal 10 is connected with the bottom end of the middle short shaft 9, the lower part of the parking seal is connected with the mechanical seal 6, and the bottom of the mechanical seal 6 is connected with a main coolant pump shaft. The mechanical seal 6 is provided with a high-pressure leakage outlet and a low-pressure leakage outlet.
The top shaft oil pump 1 is an accessory device of the main coolant pump motor 7, and lubricating oil is sucked from an oil tank of the main coolant pump motor 7 by the top shaft oil pump 1 and directly injected to the surface of the main thrust pad, so that the surface of the main thrust pad is fully lubricated.
The two magnetic meter seats 3 are respectively arranged at the symmetrical positions of the two sides of the middle short shaft 9 and fixed on a sealing chamber cover of the parking seal 10.
The dial indicator 2 is arranged on the magnetic gauge stand 3, and the gauge needle of the dial indicator 2 is ensured to be adjusted to the position 0 and points to the axial direction of the middle short shaft 9.
The inlet of the nitrogen isolation valve 4 is connected with the nitrogen supply system of the parking seal 10 and is used as the nitrogen supply valve of the parking seal 10. After the nitrogen isolation valve 4 is opened, the parking seal 10 is put into operation, so that the pump shaft of the main coolant pump is subjected to upward jacking force, and further, the motor rotor 8 of the main coolant pump is subjected to upward jacking force.
The outlet of the nitrogen isolation valve 4 is divided into two branches, wherein one branch is directly connected with the nitrogen chamber in the parking seal 10 body, the other branch is led to the inlet of the exhaust valve 5, and the outlet of the exhaust valve 5 is directly communicated with the atmosphere. The exhaust valve 5 is used as a nitrogen discharge valve of the parking seal 10, the parking seal 10 is released after the exhaust valve 5 is opened, the pump shaft of the main coolant pump is released by upward jacking force, and then the motor rotor 8 of the main coolant pump is released by upward jacking force.
The low-pressure leakage outlet on the mechanical seal 6 is connected with the inlet of the low-pressure leakage isolation valve 11 through a low-pressure leakage pipeline, and the high-pressure leakage outlet on the mechanical seal 6 is connected with the inlet of the high-pressure leakage isolation valve 14 through a high-pressure leakage pipeline. The low-pressure leakage isolation valve 11 is a drain valve for the second-stage sealing leakage of the mechanical seal 6, the high-pressure leakage isolation valve 14 is a drain valve for the third-stage sealing leakage of the mechanical seal 6, and the leakage water pressure is far higher than the pressure of the second-stage sealing leakage of the mechanical seal 6.
A branch is provided between the low pressure leakage line and the high pressure leakage line to communicate the low pressure leakage line and the high pressure leakage line. And a high-low pressure leakage communicating valve A12 and a high-low pressure leakage communicating valve B13 are connected in series on the branch, wherein the high-low pressure leakage communicating valve A12 is directly communicated with the low-pressure leakage pipeline and is communicated with the high-pressure leakage pipeline after passing through the high-low pressure leakage communicating valve B13. After the high-low pressure leakage communicating valve B13 and the high-low pressure leakage communicating valve A12 are opened, high-pressure water in the high-pressure leakage pipeline flows into the low-pressure leakage pipeline due to pressure difference in the pipeline, the pressure of the secondary sealing leakage water of the mechanical seal is increased, and then the upward jacking force applied to the pump shaft of the main coolant pump is increased.
A method for jacking a rotor of a main coolant pump motor of a nuclear power station comprises the following steps:
step 1: confirming initial state of valve
Confirming that the top shaft oil pump 1 is in a shutdown state, ensuring that the shaft seal water flow of the main coolant pump is in a normal value range of 1.9-2.5m3/h, and keeping the shaft seal water flow at a normal value in the subsequent implementation process;
ensuring that the nitrogen isolation valve 4, the high-low pressure leakage communicating valve A12 and the high-low pressure leakage communicating valve B13 are in a closed state, and the exhaust valve 5, the low-pressure leakage isolation valve 11 and the high-pressure leakage isolation valve 14 are in an open state; at the moment, nitrogen cannot be injected into the parking seal 10 through the nitrogen isolation valve 4, and the parking seal is not put into operation; the second stage of sealing leakage water of the mechanical seal 6 is discharged through a low pressure leakage isolation valve 11; the third stage of sealing leakage water of the mechanical seal 6 is discharged through a high-pressure leakage isolation valve 14;
step 2: the valve state is adjusted to make the rotor 8 of the motor of the main coolant pump receive upward jacking force
The high-pressure leakage isolation valve 14 and the exhaust valve 5 are closed, the nitrogen isolation valve 4 is opened, and the parking seal 10 is put into operation; at the moment, nitrogen is injected into the parking seal 10 through the nitrogen isolation valve 4, so that the pressure inside the parking seal 10 is increased, and the rotor 8 of the main coolant pump motor is subjected to upward jacking force of the parking seal 10;
then closing the low-pressure leakage isolation valve 11 and the high-pressure leakage isolation valve 14, and opening the high-low pressure leakage communication valve A12 and the high-low pressure leakage communication valve B13, so that the high-pressure leakage pipeline and the low-pressure leakage pipeline of the mechanical seal 6 are communicated; at this time, high-pressure leakage water of the mechanical seal 6 flows into a low-pressure leakage pipeline of the mechanical seal 6 through the high-low pressure leakage communication valve B13 and the high-low pressure leakage communication valve A12, so that the internal pressure of the mechanical seal 6 is increased, and further the upward jacking force of the motor rotor 8 of the main coolant pump is continuously increased;
and step 3: jacking of main coolant pump motor rotor 8
The pressure of a primary circuit system is adjusted to slowly rise through the upper filling and lower discharging function of the chemical volume control primary circuit system, the pressure value is read through a primary circuit system pressure gauge, the pressure of the primary circuit system is increased to 1.80Mpa, then the pressure is gradually increased after being increased by 0.02Mpa for 3 minutes, the readings of two dial indicators 2 are observed during the period, and the average value of the readings of the two dial indicators 2 is taken as the jacking height value of a monitoring motor rotor 8; when the jacking height value is larger than or equal to 0.10mm, stopping boosting operation on a loop system, and keeping the current state for 10 minutes to fully feed oil between the auxiliary thrust pad and the thrust disc of the main pump motor;
finally, the pressure state of the system is reduced by discharging the water of the primary loop system, and the pressure of the primary loop system is reduced to a pressure platform of 1.80 Mpa;
and 4, step 4: restoring valve state
By closing the high-low pressure leakage communicating valve A12 and the high-low pressure leakage communicating valve B13 in sequence, opening the low-pressure leakage isolating valve 11, closing the nitrogen isolating valve 4, opening the exhaust valve 5, exiting the parking seal 10, and then opening the high-pressure leakage isolating valve 14; at the moment, nitrogen in the parking seal 10 is discharged through the exhaust valve 5, the parking seal 10 is taken out of operation, second-stage sealing leakage water of the mechanical seal 6 is discharged through the low-pressure leakage isolating valve 11, third-stage sealing leakage water of the mechanical seal 6 is discharged through the high-pressure leakage isolating valve 14, so that the internal pressure of the mechanical seal 6 is reduced, upward jacking force borne by the main coolant pump motor rotor 8 is reduced or eliminated, and the main coolant pump motor rotor 8 naturally falls;
and (3) observing the reading of the dial indicator 2, monitoring the falling displacement of the main pump motor rotor 8, confirming that the indicator needles of the two dial indicators 2 return to the 0 position, and normally returning the main coolant pump motor rotor 8 to the seat.
Claims (5)
1. A method for jacking a motor rotor of a main coolant pump of a nuclear power station is characterized by comprising the following steps: the method comprises the following steps:
step 1: confirming initial state of valve
Ensuring that the nitrogen isolation valve (4), the high-low pressure leakage communicating valve A (12) and the high-low pressure leakage communicating valve B (13) are in a closed state, and the exhaust valve (5), the low-pressure leakage isolation valve (11) and the high-pressure leakage isolation valve (14) are in an open state;
at the moment, nitrogen cannot be injected into the parking seal (10) through the nitrogen isolation valve (4), and the parking seal is not put into operation; the second stage of sealing leakage water of the mechanical seal (6) is discharged through a low-pressure leakage isolation valve (11), and the third stage of sealing leakage water of the mechanical seal (6) is discharged through a high-pressure leakage isolation valve (14);
step 2: adjusting the valve state causes the rotor (8) of the main coolant pump motor to be forced upwards
The high-pressure leakage isolation valve (14) and the exhaust valve (5) are closed, the nitrogen isolation valve (4) is opened, and the operation and the shutdown are sealed (10); at the moment, nitrogen is injected into the parking seal (10) through the nitrogen isolation valve (4), so that the internal pressure of the parking seal (10) is increased, and the motor rotor (8) of the main coolant pump is subjected to upward jacking force of the parking seal (10);
and step 3: jacking of the rotor (8) of the main coolant pump motor
Adjusting the pressure of a loop system to slowly rise, reading a pressure value through a loop system pressure gauge to enable the pressure of the loop system to rise to 1.80Mpa, then gradually raising the pressure, observing readings of the two dial indicators (2) during the period, and taking the average value of the readings of the two dial indicators (2) as the jacking height value of the monitoring motor rotor (8); when the jacking height value is larger than or equal to 0.10mm, stopping boosting operation on a loop system, and keeping the current state for 10 minutes to fully feed oil between the auxiliary thrust pad and the thrust disc of the main pump motor;
finally, the pressure state of the system is reduced by discharging the water of the primary loop system, and the pressure of the primary loop system is reduced to a pressure platform of 1.80 Mpa;
and 4, step 4: restoring valve state
Closing a high-low pressure leakage communicating valve A (12) and a high-low pressure leakage communicating valve B (13) in sequence, opening a low-pressure leakage isolating valve (11), closing a nitrogen isolating valve (4), opening an exhaust valve (5), exiting a parking seal (10), and then opening a high-pressure leakage isolating valve (14); at the moment, nitrogen in the parking seal (10) is discharged through the exhaust valve (5), the parking seal (10) is withdrawn from operation, second-stage seal leakage water of the mechanical seal (6) is discharged through the low-pressure leakage isolating valve (11), third-stage seal leakage water of the mechanical seal (6) is discharged through the high-pressure leakage isolating valve (14), so that the internal pressure of the mechanical seal (6) is reduced, upward jacking force borne by the motor rotor (8) of the main coolant pump is reduced or eliminated, and the motor rotor (8) of the main coolant pump naturally falls;
and (3) observing the reading of the dial indicator (2), monitoring the falling displacement of the main pump motor rotor (8), confirming that the indicator needles of the two dial indicators (2) return to the 0 position, and normally returning the main coolant pump motor rotor (8) to the seat.
2. The method for jacking up the rotor of the main coolant pump motor of the nuclear power plant as claimed in claim 1, characterized in that: step 2, closing a low-pressure leakage isolation valve (11) and a high-pressure leakage isolation valve (14), and opening a high-pressure and low-pressure leakage communication valve A (12) and a high-pressure and low-pressure leakage communication valve B (13) to enable a high-pressure leakage pipeline and a low-pressure leakage pipeline of the mechanical seal (6) to be communicated;
at the moment, high-pressure leakage water of the mechanical seal (6) flows into a low-pressure leakage pipeline of the mechanical seal (6) through the high-low pressure leakage communication valve B (13) and the high-low pressure leakage communication valve A (12), so that the internal pressure of the mechanical seal (6) is increased, and further the upward jacking force of a motor rotor (8) of the main coolant pump is continuously increased.
3. The method for jacking up the rotor of the main coolant pump motor of the nuclear power plant as claimed in claim 2, characterized in that: step 1, confirming that the top shaft oil pump 1 is in a shutdown state and the pump shaft seal water flow of the main coolant is 1.9-2.5m3The normal value range of/h and keeping the shaft seal water flow at the normal value in the subsequent implementation process.
4. The method for jacking up a rotor of a main coolant pump motor of a nuclear power plant as claimed in claim 3, characterized in that: the gradual pressure rise in the step 3 is 0.02Mpa every time the pressure is raised for 3 minutes.
5. The method for jacking up the rotor of the main coolant pump motor of the nuclear power plant as claimed in claim 4, wherein: and 3, regulating the pressure of the primary circuit system to slowly rise through the upper filling and lower discharging functions of the chemical volume control primary circuit system.
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| CN201910563788.XA CN110336427B (en) | 2019-06-26 | 2019-06-26 | Method for jacking motor rotor of main coolant pump of nuclear power station |
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| CN201910563788.XA CN110336427B (en) | 2019-06-26 | 2019-06-26 | Method for jacking motor rotor of main coolant pump of nuclear power station |
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| JP2015161257A (en) * | 2014-02-28 | 2015-09-07 | 株式会社東芝 | Turning device, and control method thereof |
| CN107923405A (en) * | 2016-01-11 | 2018-04-17 | 机械制造中心设计局股份公司 | Main circulation pump unit |
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2019
- 2019-06-26 CN CN201910563788.XA patent/CN110336427B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2006342791A (en) * | 2005-05-13 | 2006-12-21 | Boc Edwards Kk | Vacuum pump |
| CN102969835A (en) * | 2012-12-14 | 2013-03-13 | 哈尔滨电气动力装备有限公司 | Main cooling agent pump motor of second-generation nuclear power plant |
| CN103267030A (en) * | 2013-05-22 | 2013-08-28 | 哈尔滨电气动力装备有限公司 | Reactor coolant pump shut-down seal device |
| JP2015161257A (en) * | 2014-02-28 | 2015-09-07 | 株式会社東芝 | Turning device, and control method thereof |
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