JP2012181168A - Apparatus and method for monitoring condition of rolling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling device by which the concentration of moisture mixed into a lubricant is monitored and can be precisely obtained, and which can contribute to measurement of the generation rate of hydrogen embrittlement and prediction of the occurrence time of exfoliation due to the hydrogen embrittlement or the like and which enables the comprehensive abnormality determination including vibration abnormality.SOLUTION: Condition monitoring means 11 is provided which has a function of monitoring the concentration of moisture mixed into the lubricant of a rolling device 1. The means 11 includes: electrostatic capacitance detection means 7 and oil temperature measurement means 8 which detect the electrostatic capacitance and the oil temperature in the lubricant of the rolling device 1, respectively; and moisture concentration calculation means 9 which detects the concentration of the mixed moisture from the detected electrostatic capacitance and oil temperature. The calculated concentration of the mixed moisture is compared with a threshold, and an abnormality diagnosis part 10a is provided in which it is diagnosed as abnormal when exceeding the threshold. In addition to that, the comprehensive abnormality determination is made possible by using a vibration sensor 70, a displacement sensor 240, an AE sensor 250, and an impurity sensor 270 or the like.

Description

  The present invention monitors various rolling devices provided with bearings, for example, for prediction of abnormality of various bearings constituting the rolling devices in a wind power generator, particularly, monitoring of bearing peeling due to hydrogen embrittlement of the bearings. The present invention relates to a rolling device state monitoring device and a monitoring method.

  There are several bearing abnormality predictions (for example, Patent Document 1). Among them, the deterioration of the lubricant is measured to predict the life. When the lubricant deteriorates, the oil film thickness at the contact portion in the bearing decreases, and wear and surface damage tend to occur. Therefore, the life reduction is monitored and predicted by measuring the deterioration state of the lubricating oil.

  By the way, when rolling parts such as rolling bearings and gears are used under conditions in which water is mixed (Non-Patent Documents 1 to 5) and conditions involving slipping (Non-Patent Document 6), water and lubricants are used. Decomposition generates hydrogen, which can cause premature damage as it penetrates into the steel. When metal contact occurs at the contact surface between the contact elements and the new metal surface is exposed, generation of hydrogen due to decomposition of water and lubricant, and penetration into the steel are promoted. This is an experiment in which diffusible hydrogen was clearly detected in steel as a result of thermal desorption hydrogen analysis after abrasive wear of rolling parts steel with emery paper while dripping water and lubricant. This is proved by the facts (Non-patent Document 7). According to this, more diffusible hydrogen is detected when water is dropped than lubricating oil. Therefore, it can be said that when water is mixed in the lubricant of the rolling parts used under the condition that slip occurs, hydrogen is further generated and easily enters the steel. Since hydrogen significantly reduces the fatigue strength of steel (Non-Patent Document 8), even if the maximum contact surface pressure is not so large, early hydrogen damage occurs.

JP 2007-310611 A JP 2006-138376 A

El. By L. Grunberg, Proc. Phys. Soc. (London), B66 (1953) 153-161. El. Granberg, Di. Scott (L. Grunberg and D. Scott), J. Inst. Petrol., 44 (1958) 406-410. El. L. Grunberg, Di Tee Jamison, Di. Scott (D. T. Jamieson and D. Scott), Philosophical magazine, 8 (1963) 1553-1568. Pee. Schatzberg, Ai. M. By P. Schatzberg and I. M. Felsen, Wear, 12 (1968) 331-342. Pee. By P. Schatzberg, J. Lub. Tech., 231 (1971) 231-235. Kay. Tamada, etch. Tanaka (K. Tamada and H. Tanaka), Wear, 199 (1996) 245-252. Kei Tanimoto, Hiromasa Tanaka, Shoichi Sugimura, Tribology Conference Proceedings, (2010-5 Tokyo), 203-204. Wy. Matsubara, etch. Hamada (Y. Matsubara and H. Hamada), Bearing Steel Technology, ASTM STP1465, J. M. Beswick Ed., (2007), 153-166. Etch. Micami, tee. Kawamura (H. Mikami and T. Kawamura), SAE Paper, (2007), No. 2007-01-0113. Tomoaki Makino, Dissertation (Kyoto University), (2000), 134p

  Although it can be detected by an acceleration vibration sensor, etc., if the separation of the raceway surface and rolling surface of various rolling devices occurs due to hydrogen embrittlement, the life due to this type of separation is significantly shorter than the life due to normal rolling fatigue, Moreover, since the separation proceeds suddenly without any preliminary surface damage, it is difficult to predict an abnormality with the vibration acceleration sensor. Further, in order to shorten the operation stop time of the wind turbine, it is required to predict the occurrence time of separation due to hydrogen embrittlement.

In addition, as described above, when water is mixed in the lubricant of the rolling part used under the condition that causes slip, it can be said that hydrogen is further generated and easily penetrates into the steel. Rolling parts will tend to be used in conditions where hydrogen is more likely to be generated. Therefore, it is necessary to monitor the mixed water concentration in the lubricating oil and diagnose the excessive mixed water concentration so as to call attention to early damage caused by hydrogen embrittlement and take necessary measures.
In Patent Document 2, as one function of the monitoring / diagnosis system, a dielectric constant proportional to a capacitance described later is monitored, and the oxidation degree of the lubricant is monitored / diagnosed. However, only the concept is described, and no specific data is described. Moreover, it is limited to the abnormality diagnosis of a rolling bearing. The moisture content in the lubricating oil must be measured not only by capacitance but also by temperature dependence.

  The reason why water is mixed in the lubricating oil of the oil lubricated rolling device will be described. The concentration of water contained in the lubricating oil of oil-lubricated rolling devices, especially those used outdoors such as wind power generators, is within a macro-closed area due to daily fluctuations in temperature and dryness. Even if the lubricating oil seems to stay, it is considered that the atmosphere is breathing inside and outside the device microscopically. That is, since the temperature in the rolling device becomes higher than the outside air temperature during operation, the inside of the rolling device becomes positive pressure, and a part of the atmosphere in the rolling device is released to the outside. On the other hand, when it stops and the atmospheric temperature in a rolling device falls from external temperature, since the inside of a rolling device will become a negative pressure, external air will enter into a rolling device. When the outside air that has entered is humid, dew condensation occurs in the rolling device, and moisture is mixed into the lubricating oil. In this way, even in normal use, water can be mixed into the lubricating oil. If the rolling device is exposed to heavy rain or heavy wind and rain, or if it is used in a hot and humid environment such as a tropical area, such as a wind power generator or construction machinery, more water will be mixed. It is done.

The object of the present invention is to accurately determine the concentration of moisture contained in the lubricating oil in a rolling device equipped with a bearing, and as a result, measure the rate of occurrence of hydrogen embrittlement and peel off due to hydrogen embrittlement. A rolling device condition monitoring device that can contribute to the prediction of the occurrence time of the bearing and can perform comprehensive bearing failure diagnosis necessary for shortening the rolling device operation stop time by using abnormality diagnosis by vibration detection, and It is to provide a monitoring method.
Another object of the present invention is to alert the early damage due to hydrogen embrittlement by diagnosing abnormalities when the mixed water concentration exceeds a threshold value, to replace with a seal with excellent hermeticity, condensation on the heater, etc. It is to promote measures such as activation of the heating means for preventing the above.
Still another object of the present invention is to provide a state monitoring device for a rolling device capable of obtaining and setting a threshold value for appropriately performing the abnormality diagnosis.

  The rolling device state monitoring device and monitoring method of the present invention are provided with state monitoring means having a function of monitoring the concentration of water contained in the lubricating oil of the rolling device, and this state monitoring means is provided for the lubricating oil of the rolling device. The electrostatic capacity detecting means and the oil temperature measuring means for detecting the electrostatic capacity and the oil temperature respectively, and the electrostatic capacity and the oil temperature detected by the electrostatic capacity detecting means and the oil temperature measuring means are determined. A vibration sensor for monitoring the vibration of a bearing constituting the rolling device, and determining an abnormality of the bearing using an output of the vibration sensor. An abnormality diagnosis means for vibration abnormality is provided. In this specification, the “rolling device” refers to a device comprising a part including a rolling and sliding contact element such as a rolling bearing or a gear. For example, in a wind power generator, a main shaft support device or a speed increasing device is used. There are machines. Various types of rolling bearings are used in these spindle support devices and gearboxes and are lubricated with oil.

The hydrogen embrittlement of the bearing is more likely to occur as the moisture in the lubricating oil increases. Therefore, the probability of delamination due to hydrogen embrittlement of the bearing is predicted by measuring the moisture concentration in the lubricating oil. As a result, this leads to the prediction of the occurrence time of the separation.
According to the above configuration, the oil temperature measuring means and the capacitance detecting means for detecting the capacitance and oil temperature in the lubricating oil, and the moisture concentration calculation for detecting the mixed moisture concentration from the detected capacitance and oil temperature. Means, and the mixed water concentration can be obtained accurately from the capacitance and the oil temperature. Therefore, in the oil lubrication type rolling device, the mixed water concentration in the lubricating oil can be monitored and accurately obtained.
Further, the state monitoring means includes a vibration sensor for monitoring vibration of a bearing constituting the rolling device, and a vibration abnormality abnormality diagnosis means for determining abnormality of the bearing using an output of the vibration sensor, Since the detection of mixed water concentration and abnormality diagnosis by vibration detection are used in combination, comprehensive abnormality diagnosis of the bearing can be performed.

  In the present invention, it is preferable to provide an abnormality diagnosing means for comparing the mixed water concentration calculated by the water concentration calculating means with a threshold value and diagnosing an abnormality when exceeding the threshold value. When an abnormality diagnosis means is provided, an abnormality diagnosis is performed when the concentration of mixed water exceeds a threshold value, so that attention is paid to early damage caused by hydrogen embrittlement of rolling parts, and a seal with excellent sealing performance is obtained. Measures such as replacement and activation of heating means for preventing condensation such as a heater can be promoted.

  In this invention, the rolling device may have an oil bath lubrication mechanism for lubricating the bearing, and the state monitoring means may monitor the lubricating oil of the bearing. The rolling device may include a circulating oil supply mechanism that lubricates the bearing, and the state monitoring unit may monitor the lubricating oil of the bearing.

In the present invention, a capacitance and oil temperature measurement chamber in which the capacitance detection means and the oil temperature measurement means are installed may be provided inside or outside the housing of the rolling device. Further, a capacitance and oil temperature measurement chamber may be provided in the circulating oil supply mechanism of the rolling device. A stirring means for stirring the lubricating oil in the capacitance and oil temperature measurement chamber may be provided.
By stirring the lubricating oil, the mixed state of the lubricating oil and water is improved, and the mixed water concentration can be detected with high accuracy. Therefore, by providing the stirring means in the measurement chamber, the mixed state of the lubricating oil and water is further improved, and the detection accuracy is improved.

  When the measurement chamber and the stirring means are provided, it is preferable that the amount of lubricating oil accumulated in the capacitance and oil temperature measurement chamber is 100 mL or less and the variation is ± 5 mL.

  Further, it is preferable to provide means for facilitating discharge of water and additives having a specific gravity greater than that of the lubricating oil into the rolling device and the capacitance and oil temperature measurement chamber. This means is constituted by, for example, an inclined groove on the bottom surface of the lubricating oil reservoir. The lubricating oil is allowed to flow into the measurement chamber from the lowest part of the bottom surface of the inclined groove.

  As the capacitance detecting means and the oil temperature measuring means, a sensor in which a capacitance and an oil temperature can be measured may be integrated.

  The abnormality diagnosis means for the vibration abnormality may include first and second calculation units, an envelope processing unit, and a diagnosis unit. The first calculation unit calculates an effective value of the vibration waveform measured using the vibration sensor. The envelope processing unit generates an envelope waveform of the vibration waveform by performing envelope processing on the vibration waveform measured using the vibration sensor. The second calculation unit calculates an effective value of the AC component of the envelope waveform generated by the envelope processing unit. The diagnosis unit diagnoses an abnormality of the rolling bearing based on the effective value of the vibration waveform calculated by the first calculation unit and the effective value of the AC component of the envelope waveform calculated by the second calculation unit.

Preferably, the apparatus further includes a rotation sensor for detecting a rotation speed of the shaft or the rolling bearing supported by the rolling bearing. The abnormality diagnosis means for vibration abnormality further includes a modified vibration degree calculation unit and a modified modulation degree calculation unit. The corrected vibration degree calculation unit calculates a corrected vibration degree obtained by normalizing the effective value of the vibration waveform calculated by the first calculation unit with the rotation speed. The correction modulation degree calculation unit calculates a correction modulation degree obtained by normalizing the effective value of the AC component of the envelope waveform calculated by the second calculation unit with the rotation speed. The diagnosis unit diagnoses an abnormality of the rolling bearing based on the corrected vibration degree and the corrected modulation degree.
More preferably, the diagnosis unit diagnoses an abnormality of the rolling bearing based on a transition of a temporal change in the correction vibration degree and the correction modulation degree.

  Preferably, a displacement meter that detects a relative displacement between the inner and outer rings in the bearing constituting the rolling device, and a displacement abnormality abnormality diagnosis unit that determines abnormality of the bearing using an output of the displacement meter are provided. . Then, the abnormality diagnosis means diagnoses the abnormality of the rolling bearing using the detection value of the displacement sensor.

  Preferably, an AE sensor for detecting an acoustic emission wave generated from the rolling bearing is further provided. Then, the abnormality diagnosing means diagnoses the abnormality of the rolling bearing using the detection value of the AE sensor.

  Preferably, the apparatus further includes a sensor for measuring the amount of impurities contained in the lubricant of the rolling bearing. Then, the abnormality diagnosing means diagnoses the abnormality of the rolling bearing using the measured value of the sensor.

  Preferably, any one of the abnormality diagnosing means changes a threshold value or a determination method for determining an abnormality when the mixed water concentration detected by the water concentration calculating means exceeds a predetermined threshold value. I will let you. When the mixed water concentration changes, the range in which the vibration, displacement, detection value of the AE sensor, and detection value of the sensor for measuring the amount of impurities can be regarded as normal changes. Therefore, a more accurate abnormality determination can be performed by changing the abnormality determination threshold according to the determination result of the mixed water concentration.

In the present invention, as described above, an abnormality diagnosis unit for the mixed water concentration that is determined to be abnormal when the moisture concentration calculation unit reaches a predetermined threshold value may be provided.
In addition, the abnormality determination threshold value when the above-described mixed water concentration abnormality diagnosis means is provided is obtained and used by one of the following methods.

  For example, water is injected into the lubricating oil, the capacitance and oil temperature are measured to monitor the mixed water concentration, and the appropriate water amount obtained from the mixed water concentration is fed back to keep the mixed water concentration within a certain range. A threshold value of the mixed water concentration obtained by a rolling / sliding fatigue life test for controlling the water injection amount so as to be maintained may be obtained, and the obtained threshold value may be used. In addition, what is necessary is just to let the threshold value calculated | required by this test be a value used as the mixing | mixing water density | concentration arbitrarily defined as appropriate for judgment. Further, the “appropriate amount of water” is an amount determined using a relational expression or a table or the like that appropriately determines the relationship between the concentration of mixed water and the amount of water to be replenished. The same applies to each test.

Further, a threshold value of the mixed water concentration may be obtained by a rolling-slip fatigue life test in which the contact surface is caused to slip by a motion mechanism between contacting elements, and the obtained threshold value may be used.
A threshold value of the mixed water concentration may be obtained by a rolling-slip fatigue life test for forcibly causing a slip on a contact surface between contacting elements, and the obtained threshold value may be used.
A threshold value of the mixed water concentration may be obtained by a rolling / sliding fatigue life test in which acceleration / deceleration is performed until damage occurs, and that value may be used.

In addition, in order to promote wear of the damaged object by passing an electric current between the contact elements with the object to be damaged as the positive electrode side, a rolling rolling fatigue that uses a ceramic rolling element for the spindle support bearing and insulates the motor from the spindle of the test section. A threshold value of the mixed water concentration may be obtained by a life test, and the value may be used for the abnormality diagnosis of the mixed water concentration.
In addition, a phenomenon is known in which wear of a damaged object is accelerated when a current is passed between contact elements with the damaged object as a positive electrode side. Therefore, a ceramic rolling element is used for the spindle support bearing, and a rolling-slip fatigue life test in which the motor and the spindle of the test section have an insulating structure is used. A threshold value may be obtained and used for abnormality diagnosis of the mixed water concentration.

The state monitoring device for a rolling device according to the present invention is provided with a state monitoring means having a function of monitoring the concentration of water contained in the lubricating oil of the rolling device, and this state monitoring means is a static device in the lubricating oil of the rolling device. A capacitance detecting means for detecting the electric capacity and the oil temperature, and a moisture concentration calculating means for detecting the mixed water concentration from the capacitance and the oil temperature detected by the oil temperature measuring means according to a predetermined rule. For this reason, it is possible to monitor the concentration of moisture in the lubricating oil in the rolling device with high accuracy and, as a result, to call attention to early damage due to hydrogen embrittlement and to promote countermeasures, This can contribute to shortening the operation stop time.
Further, the state monitoring means includes a vibration sensor for monitoring vibration of a bearing constituting the rolling device, and a vibration abnormality abnormality diagnosis means for determining abnormality of the bearing using an output of the vibration sensor, Since the detection of mixed water concentration and abnormality diagnosis by vibration detection are used in combination, comprehensive abnormality diagnosis of the bearing can be performed.
In addition, when combined with an abnormality diagnosis based on the detection value of any one of a displacement meter that detects the relative displacement between the inner and outer rings, an AE sensor, and a sensor that detects the amount of impurities, the bearing of the rolling device is more accurate. Abnormal diagnosis can be performed.
The abnormality diagnosis of the mixed water concentration can be performed with higher accuracy than when the abnormality diagnosis result obtained by the various sensors in the present invention is applied to the mixed water concentration abnormality determination means.

It is a block diagram which shows the conceptual structure of the state monitoring apparatus of the rolling device which concerns on 1st Embodiment of this invention. It is a fracture | rupture side view of the wind power generator provided with the rolling device used as the monitoring object of the state monitoring apparatus. It is sectional drawing of an example of the gearbox in the wind power generator. It is a partially omitted block diagram showing a conceptual configuration of a state monitoring device for a rolling device according to another embodiment. It is a partially abbreviate | omitted block diagram which shows the conceptual structure of the state monitoring apparatus of the rolling device which concerns on other embodiment. It is a partially abbreviate | omitted block diagram which shows the conceptual structure of the state monitoring apparatus of the rolling device which concerns on other embodiment. It is a partially abbreviate | omitted block diagram which shows the conceptual structure of the state monitoring apparatus of the rolling device which concerns on other embodiment. It is a partially abbreviate | omitted block diagram which shows the conceptual structure of the state monitoring apparatus of the rolling device which concerns on other embodiment. It is a graph which shows the water density | concentration (predicted data) in the area | region where the change of an ocean or a cold / warm state is intense. It is a graph which shows the water concentration (predicted data) in the area | region where there is little change of the land and the temperature. It is a conceptual diagram of an example of the test apparatus used for the rolling sliding fatigue life test method for calculating | requiring the suitable threshold value determined with the state monitoring apparatus of the rolling device of this invention. It is a pattern diagram which shows the example of the minimum pattern setting of the acceleration / deceleration driving | operation in the test method. It is a conceptual diagram of the other example of a test apparatus. It is a conceptual diagram of the further another example of a test apparatus. (A) is a front view of an example of the test piece which comprises the rolling component simulation body used for the test method, (B) is sectional drawing of the rolling component simulation body incorporating the test piece. It is sectional drawing of the testing apparatus used for the test of the test piece of the rolling component simulation body of FIG. It is a graph which shows the change of the amount of mixed water measured by the same test. It is a schematic diagram of the test apparatus used for the saturated water concentration measurement of lubricating oil. It is a graph which shows the relationship between the mixing water density | concentration measured with the test apparatus of FIG. 18, and an electrostatic capacitance. It is a schematic diagram of the test apparatus used for the capacitance measurement of water-mixed oil. It is a graph which shows the relationship between the mixing water density | concentration measured with the test apparatus of FIG. 20, and an electrostatic capacitance. It is a graph which shows the relationship between the oil temperature measured by the same test, and an electrostatic capacitance. It is a block diagram which shows the conceptual structure of the abnormality diagnosis means of the vibration abnormality which comprises the state monitoring apparatus in 1st Embodiment. It is the figure which showed the vibration waveform of the bearing when abnormality has not generate | occur | produced in the bearing. It is a figure which shows the vibration waveform of the bearing seen when the surface roughness of the bearing ring of a bearing and poor lubrication generate | occur | produce. It is the figure which showed the vibration waveform of the bearing in the initial stage when separation | separation generate | occur | produces in the track | orbit transfer of a bearing. It is the figure which showed the vibration waveform of the bearing seen in the last stage of the peeling abnormality. This shows the temporal change in the effective value of the vibration waveform of the bearing and the effective value of the AC component of the envelope waveform when the separation occurs in a part of the bearing ring and then the separation moves across the entire ring. FIG. It is the figure which showed the time change of the effective value of the vibration waveform of a bearing, and the effective value of the alternating current component of an envelope waveform at the time of the surface roughness of a bearing or the poor lubrication of a bearing generate | occur | produced. It is a block diagram of a conceptual structure which shows the 2nd specific example of the abnormality diagnostic means of the vibration abnormality. It is a block diagram of a conceptual structure which shows the 3rd specific example of the abnormality diagnosis means of the vibration abnormality. It is a block diagram of a conceptual structure which shows the 4th specific example of the abnormality diagnostic means of the vibration abnormality. It is the figure which showed schematically the whole structure of the system which shows other embodiment of the state monitoring apparatus of the same wind power generator. It is a block diagram of a conceptual structure which shows the 5th specific example of the abnormality diagnostic means of the vibration abnormality.

A first embodiment of the present invention will be described with reference to FIGS. This state monitoring device and method for the rolling device are provided with a state monitoring means 11 having a function of monitoring the concentration of water contained in the lubricating oil of the rolling device 1. As described above, the rolling device 1 is a device composed of parts including contact elements that roll and slide, such as rolling bearings and gears. The rolling component 3 is a component that serves as a contact element that rolls and slides in the rolling device 1.
The rolling device 1 in this embodiment corresponds to, for example, the speed increaser 440 and the main shaft bearing device 461 in the wind power generator 400 shown in FIGS.

  The embodiment will be described by taking as an example the case where the present state monitoring device is applied to a wind turbine generator. FIG. 2 is a diagram schematically showing the configuration of the wind power generator. The wind power generator 400 includes a main shaft 420, a blade 430, a speed increaser 540, a power generator 550, a main shaft bearing device 461 having a main shaft bearing 460, and the data processing device 2. The data processing device 2 includes a computer and a program that perform arithmetic processing in the state monitoring device of the wind turbine generator. The speed increaser 440, the generator 450, the main shaft bearing 460, and the data processing device 2 are stored in the nacelle 490, and the nacelle 490 is supported by the tower 500.

  The main shaft 420 enters the nacelle 490, is connected to the input shaft of the speed increaser 440, and is rotatably supported by the main shaft bearing 460. The main shaft 420 transmits the rotational torque generated by the blade 430 that receives wind force to the input shaft of the speed increaser 440. The blade 430 is provided at the tip of the main shaft 420 and converts wind force into rotational torque and transmits it to the main shaft 420.

  The main shaft bearing 460 is fixedly installed in the nacelle 490 via a bearing housing 462, and supports the main shaft 420 in a freely rotatable manner. The bearing housing 462, the main shaft bearing 460, and a lubrication mechanism (not shown) that lubricates the main shaft bearing 460 constitutes one of the rolling devices 1 of FIG. The main shaft bearing 460 is composed of a rolling bearing, for example, a self-aligning roller bearing, a tapered roller bearing, a cylindrical roller bearing, or a ball bearing. These bearings may be single row or double row.

  The speed increaser 440 is provided between the main shaft 420 and the power generator 450, and increases the rotational speed of the main shaft 420 and outputs it to the power generator 450. The generator 450 is connected to the output shaft of the speed increaser 440 and generates electric power by the rotational torque received from the speed increaser 440. The generator 450 is constituted by, for example, an induction generator. The generator 450 is also provided with a bearing that rotatably supports the rotor.

  FIG. 3 shows an example of the speed increaser 440. The speed increaser 440 is provided with a planetary gear mechanism 23 serving as a primary speed increaser and a secondary speed increaser 24 between the input shaft 21 and the output shaft 22. The planetary gear mechanism 23 has a planetary gear 26 installed on a carrier 25 integral with the input shaft 21, meshes the planetary gear 26 with an internal ring gear 27 and a sun gear 28, and intermediately outputs a shaft integral with the sun gear 28. The axis 29 is used. The secondary speed increaser 24 includes a gear train that transmits the rotation of the intermediate output shaft 29 to the output shaft 22 via a plurality of gears 31 to 34. The rolling gear 3 serving as the planetary gear 26, the bearing 35 that supports the planetary gear 26, the ring gear 27, and the gear 31 of the secondary speed increaser 24 is connected to the lubricating oil 5 in the lubricating oil reservoir 4 a in the housing 4. Soaked in. The lubricating oil storage tank 4a is circulated by circulating oil supply means (not shown) including a pump and piping. The circulating oil supply means is not necessarily provided, and may be an oil bath lubrication type.

  FIG. 1 shows a conceptual configuration of a rolling device state monitoring device. The rolling device 1 is a general term for devices that cause a rotation operation in a mechanism that constitutes the wind power generator 400, and is, for example, a speed increaser 440. The rolling device 1 may be a device including a main shaft bearing device 461 and a lubrication mechanism (not shown).

  A mixed water concentration monitoring device 6 for monitoring the mixed water concentration of the lubricating oil 5 in the lubricating oil storage tank 4a constituting the rolling device 1 is provided for any of the rolling devices 1 having the above-described configuration. The mixed water concentration monitoring device 6 includes a capacitance detecting means 7 and an oil temperature measuring means 8 for detecting a capacitance and an oil temperature in the lubricating oil 5, respectively, and a mixed water concentration abnormality diagnosis means 10. The abnormality diagnosing means 10 includes a water concentration calculating means 9 for detecting a mixed water concentration from the electrostatic capacity and the oil temperature detected by the electrostatic capacity detecting means 7 and the oil temperature measuring means 8 according to a predetermined rule, The mixed moisture concentration calculated by the moisture concentration calculating means 9 is compared with a threshold value S1, and the abnormality diagnosis unit 10a diagnoses an abnormality when the threshold value S1 is exceeded. The capacitance detection means 7 may be any device that is immersed in a liquid and capable of detecting the capacitance of the liquid, and various types of capacitance meters can be used. For the oil temperature measuring means 8, a thermocouple or the like is used. The capacitance detecting means 7 and the oil temperature measuring means 8 may be constituted by an integrated capacitance / oil temperature means 7A integrated with each other.

  The abnormality diagnosing means 10 including the moisture concentration calculating means 9 and the abnormality diagnosing unit 10a is constituted by a computer such as a microcomputer or a personal computer and its program, or is constituted by a dedicated electronic circuit. The abnormality diagnosis unit 10 is provided in the data processing apparatus 2 described with reference to FIG.

  The moisture concentration calculating means 9 has a relationship setting means 9a in which the relationship between the capacitance, the oil temperature, and the mixed moisture concentration is set by a calculation formula or a table. From the input capacitance and oil temperature, The mixed water concentration is calculated using the relationship stored in the relationship setting means 9a, that is, the above-defined rule.

  According to the mixed water concentration monitoring device 6 having the above configuration, the electrostatic capacity and the oil temperature in the lubricating oil 5 are detected by the electrostatic capacity detecting means 7 and the oil temperature measuring means 8, and the detected electrostatic capacity and oil temperature are detected. From the above, the water concentration calculation means 9 detects the mixed water concentration. In this way, since the mixed water concentration is obtained from the capacitance and the oil temperature, the mixed water concentration can be obtained with high accuracy. Therefore, the oil lubrication type rolling device 1 can monitor the mixed water concentration in the lubricating oil 5 with high accuracy, and can call attention to early damage due to hydrogen embrittlement of the rolling parts. Further, since the abnormality diagnosis unit 10a is included and the abnormality is determined when the mixed water concentration exceeds the threshold value S1, the hydrogen embrittlement of the rolling component 3 which is a component constituting the rolling device 8 is performed. Predicted early damage can be more reliably predicted and alerted. The reason why the mixed water concentration can be accurately detected from the capacitance and the oil temperature will be described later in the explanation section of the method for setting the threshold value S1.

  In this embodiment, the state monitoring means 11 includes, in addition to the mixed water concentration abnormality diagnosis means 10, vibration abnormality abnormality diagnosis means 51, displacement abnormality abnormality diagnosis means 52, and internal crack abnormality diagnosis means. 53, impurity abnormality diagnosis means 54, and comprehensive abnormality diagnosis means 55. Communication means 56 is also provided.

  The vibration abnormality abnormality diagnosis means 51 is means for determining an abnormality of the bearing using the output of the vibration sensor 70 that monitors the vibration of any of the bearings constituting the rolling device 1. The bearing whose vibration is monitored by the vibration sensor 70 is, for example, the main shaft bearing 460 and is installed in a bearing housing or the like. The vibration sensor 70 is configured by an acceleration sensor using a piezoelectric element. The abnormality diagnosing means 51 processes the detection signal of the vibration sensor 70, compares the processing result with a predetermined threshold value S2, and determines that it is abnormal when the threshold value S2 is exceeded. As will be described later, the abnormality diagnosis means 51 obtains the rotation speed of the bearing or the shaft supported by the bearing by the rotation sensor 210 and uses the detected rotation speed for signal processing for abnormality determination. May be.

  Displacement abnormality abnormality diagnosis means 52 is means for determining abnormality of the bearing using an output of a displacement sensor 240 that is a displacement meter for detecting a relative displacement between the inner and outer rings in the bearing constituting the rolling device 1. It is. The abnormality diagnosis means 52 of the displacement abnormality compares the detected relative displacement or a value obtained by signal processing of the relative displacement with a predetermined threshold value S3, and determines that it is abnormal when the threshold value S3 is exceeded. To do.

  The internal crack abnormality diagnosis means 53 uses the output of the AE sensor 250 for detecting an acoustic emission wave in the bearing constituting the rolling device 1, and determines the output or a value obtained by signal processing of the output. When the threshold value S4 is exceeded, it is determined that there is an abnormality.

  The impurity abnormality diagnosis means 54 uses the output of the sensor 270 that detects the amount of wear powder or other impurities in the lubricating oil of the rolling device 1, and determines this output or a value obtained by signal processing of this output. Compared with the threshold value S5, if it exceeds the threshold value S5, it is determined as abnormal.

  The vibration abnormality abnormality diagnosis means 51, the displacement abnormality abnormality diagnosis means 52, the internal crack abnormality diagnosis means 53, and the impurity abnormality diagnosis means 54 are all mixed moisture concentrations detected by the moisture concentration calculation means 9. However, when the threshold value S1 is exceeded, the threshold values S2 to S5 that the abnormality diagnosis means 51 to 54 determine as abnormal may be changed, or the determination method may be changed.

  The comprehensive abnormality diagnosis unit 55 is a unit that comprehensively determines the diagnosis results of the abnormality diagnosis units 10 and 51 to 54 according to a predetermined rule. The process of changing the threshold values S2 to S5 that each abnormality diagnosis means 51 to 54 determines as abnormal or changing the determination method according to the mixed water concentration detected by the water concentration calculation means 9 is a comprehensive abnormality diagnosis. It may be performed by means 55.

  In the example of FIG. 1, the description of the measurement chamber in which the capacitance detecting means 7 and the oil temperature measuring means 8 for monitoring the mixed water concentration are omitted, but as shown in FIGS. 4 to 9 later. It is preferable to provide a measurement chamber 12 (FIGS. 4, 5, 7, and 8).

In the wind turbine generator, various rolling bearings are used inside the main shaft bearing device 461 and the speed increaser 440 and are lubricated with oil. As shown in FIGS. 4, 5, 7, and 8, a measurement chamber 12 is provided in a pipe or tank for supplying the lubricating oil, or inside or outside of the rolling device 1, and mixed moisture Measure the concentration.
The threshold value S1 for abnormality diagnosis of the mixed water concentration at the time of monitoring applies the threshold value described later with reference to FIGS. When the threshold value S1 is exceeded during monitoring, the abnormality diagnosis unit 10a outputs a signal to call attention.
Capacitance meter 7 and oil temperature measuring means 8 consisting of a thermocouple are used to measure the mixed water concentration, but by using capacitance / oil temperature means 7A in which these are integrated, individually Man-hours for installing the sensor can be shortened. A housing (not shown) for integrating two sensors (that is, a capacitance meter 7 and an oil temperature measuring means 8 comprising a thermocouple) serves as a cover for holding each sensor. Since the damage reduction effect can be expected, it is considered that the reliability of the sensor itself is also improved.

In areas where the temperature changes greatly, such as at sea or cold, the concentration of mixed water is high and bearing damage due to hydrogen embrittlement is likely to occur frequently. When this apparatus is used in such an area, it is expected that the moisture concentration exceeds the threshold value S1 in a short time as shown in FIG. In addition, when the threshold value S1 is exceeded, damage due to hydrogen embrittlement can be prevented by changing to a seal having excellent hermeticity or by starting a heating means such as a heater to prevent condensation.
Further, when the present apparatus is used in an area where there is little change in land and cold and warm, as shown in FIG. 10, it is considered that even if the water concentration changes daily, the threshold value S1 is hardly exceeded. The occurrence timing of delamination due to hydrogen embrittlement is predicted by the accumulated operation time or rotation amount exceeding the threshold value S1.
In addition, in order to perform monitoring on the safe side with respect to the measurement of the mixed moisture concentration, a measurement chamber should be provided at a lower position than the tank or oil tank, and the difference in specific gravity should be used to facilitate the intake of water and additives near the sensor. Therefore, it is better to measure a higher concentration of mixed water.

A combination with other sensors will be described.
It can be estimated whether or not the actual life of the target bearing reaches the expected life in terms of design due to the influence of hydrogen embrittlement. However, it is difficult to detect actual confirmation of peeling and damage to the bearing due to other causes. Therefore, by combining with various sensors shown below, it becomes possible to simultaneously monitor the damage of the bearing other than the hydrogen embrittlement separation.
For example, by using a vibration sensor 70 such as a vibration acceleration sensor in combination, it is possible to detect vibration due to various abnormalities including hydrogen brittle separation.

  Further, when the AE sensor 250 is used in combination instead of the vibration acceleration sensor, or when it is used at the same time, it is possible to measure not only the surface separation but also the crack caused by hydrogen embrittlement generated inside the metal. At this time, it is difficult to determine the crack by the single unit of the AE sensor 250 because AE waves of unknown cause are scattered, but when the AE wave is emitted in a state where the mixed moisture concentration is high, the occurrence of internal cracks is highly established. Therefore, it is possible to estimate the abnormality early and accurately.

In addition, when wear occurs inside the bearing due to metal contact due to various causes, it is difficult to detect it only by measuring the moisture concentration. Therefore, the wear can be detected by collecting the relative displacement of the inner ring with respect to the outer ring of the bearing using the displacement sensor 240, and more comprehensive state monitoring becomes possible.
In addition, since long-term operation is expected to cause deterioration of the lubricating oil, such as oil oxidation and dust contamination, the use of an impurity sensor 270 such as an oil deterioration sensor can reduce lubrication leading to bearing damage. Can be predicted. At the same time, by taking into account the mixed moisture concentration and correcting the impurity sensor 270 such as an oil deterioration sensor, the prediction of the early damage of the bearing caused by the lubricating oil becomes more accurate.

  From the above, it is possible to predict the probability or timing of occurrence of bearing separation due to hydrogen embrittlement. Thereby, in the wind turbine generator, it is possible to reduce the operation stop time after the occurrence of an abnormality by preparing for maintenance in advance for the occurrence of the abnormality.

4 to 8 show modified examples of the mixed water concentration monitoring device 6. In the state monitoring apparatus of the wind power generator in the embodiment of FIGS. 1 to 3, the mixed water concentration monitoring apparatus 6 shown in FIGS. 4 to 8 may be used. In addition, in these FIGS. 4-8, illustration is abbreviate | omitted about the other structure in the state monitoring apparatus of this wind power generator.
In the embodiment of FIG. 1, the electrostatic capacity and the oil temperature of the lubricating oil 5 in the lubricating oil storage tank 4 a in the housing 4 are measured, but as shown in FIG. A measurement chamber 12 communicating with the inside of the lubricating oil reservoir 4a is provided, and the capacitance detection means 7 and the oil temperature measurement means 8 may be installed so as to measure the capacitance and the oil temperature in the measurement chamber 12, respectively. good. In this case, a stirring means 13 for stirring the lubricating oil 5 in the measurement chamber 12 may be provided. The measurement chamber 12 is, for example, a partition chamber that partitions a part of the lubricating oil storage tank 4a. If the measurement chamber 12 is in the housing 4, an increase in size of the rolling device due to the provision of the measurement chamber 12 can be avoided. The stirring means 13 includes, for example, a stirring blade and a motor that rotates the rotating blade. When the measurement chamber 12 is provided and the stirring means 13 is provided, it is preferable that the amount of lubricating oil accumulated in the measurement chamber 12 is 100 mL or less and the fluctuation amount is ± 5 mL or less. Other configurations in the embodiment of FIG. 4 are the same as those of the first embodiment shown in FIG.

  By providing the measurement chamber 12, stable capacitance and oil temperature can be measured. In addition, by providing the stirring means 13, the mixed state of the lubricating oil and water is improved, and more stable capacitance and oil temperature can be measured.

  Later, it will be described together with a rolling and sliding fatigue life test. When the mixed state of the lubricating oil and water is not good, the capacitance value becomes unstable as the mixed water concentration increases. This is also true for the case of monitoring the moisture concentration in the lubricating oil of an oil bath lubrication system or a circulating oil supply type rolling device. In contrast to the rolling and sliding fatigue life test that intentionally improves the mixing state of the lubricating oil and water, it can be easily imagined that the mixing state of the lubricating oil and water is not good because the rolling device may be stopped. Lubricating oil and water may be separated. For this reason, it is desirable to provide a mechanism for mixing lubricating oil and water as much as possible in the rolling device, and to measure the capacitance as accurately as possible. Therefore, it is preferable to stir by providing the stirring means 13.

  In addition, you may provide the stirring means 13 in the corner | angular part etc. in the lubricating oil storage tank 4a, without providing the measurement chamber 12. FIG. However, in order to make the mixed state of the lubricating oil and water as good as possible, it is preferable to partition and provide the measurement chamber 12. Without partitioning, it is considered difficult to improve the mixing state of the lubricating oil and water. However, if the mixed state of the lubricating oil and water is not good, a higher capacitance value is measured, so that the mixed water concentration becomes high. That is, it can be monitored on the safe side. However, when the lubricating oil and water are separated, it is considered that a higher capacitance value is measured. In that case, it is necessary to be careful because monitoring is too safe and the number of maintenance and costs may become excessive.

  The measurement chamber 12 may be installed outside the housing 4 as shown in FIG. In this case, the measurement chamber 12 may be provided in contact with the housing 4 or separated from the housing 4. When separated, the measurement chamber 12 and the lubricating oil reservoir 4a of the housing 4 are communicated with each other through a communication pipe (not shown). If the measurement chamber 12 is provided outside the housing 4, the capacitance detection means 7 and the oil temperature measurement can be provided even if the housing 4 does not have an appropriate place for providing the measurement chamber 12, the capacitance detection means 7 and the oil temperature measurement means 8. Measurement by means 8 can be performed. Other configurations and effects in the embodiment of FIG. 5 are the same as those of the first embodiment shown in FIG.

  FIG. 6 is an example in which a circulating oil supply system is used, that is, an example in which a circulating oil supply means 14 that performs the circulating oil supply to the lubricating oil storage tank 4 a of the housing 4 is provided. The circulating oil supply means 14 includes an oil circulation path 15 such as a pipe having both ends communicating with the lubricating oil storage tank 4 a and a pump 16 that circulates the lubricating oil 5 through the oil circulation path 15. The oil circulation path 15 communicates with the discharge port 15a at the bottom of the lubricating oil storage tank 4a and the middle height position or the upper oil supply port 15b of the lubricating oil storage tank 4a. Other configurations and effects are the same as those of the first embodiment shown in FIG.

  FIG. 7 shows a circulating oil supply system in which a measurement chamber 12 communicating with the inside of the lubricating oil storage tank 4a is provided in a part of the housing 4, and the capacitance detection means 7 and the oil temperature measurement means 8 are provided in the measurement chamber 12. It is the example installed so that the electrostatic capacitance and oil temperature of each may be measured. Also in this case, a stirring means 13 for stirring the lubricating oil 5 in the measurement chamber 12 may be provided. Other configurations are the same as those of the embodiment shown in FIG.

  FIG. 8 shows an example in which a measurement chamber 12 is provided outside the housing 4 in the circulating oil supply system. The measurement chamber 12 is provided in the middle of the oil circulation path 15. The measurement chamber 12 is provided with capacitance detection means 7 and oil temperature measurement means 8 for measuring the capacitance and oil temperature of the internal lubricating oil, and stirring means 13 for stirring the lubricating oil 5 in the measurement chamber 12. Is provided. By providing the stirring means 13 in this manner, the capacitance can be measured stably and accurately, and the mixed water concentration can be accurately obtained. In this embodiment, the inclined groove 17 is provided at the bottom of the lubricating oil reservoir 4a. The lower end portion of the bottom surface of the inclined groove 17 is used as a lubricating oil discharge port 15a, and the lubricating oil 5 is periodically drawn into the measuring chamber 12 serving as a reserve tank equipped with the stirring means 13 by the pump 16 and stored. Therefore, the mixed water concentration may be monitored by measuring the capacitance and the oil temperature. As a result, even if water having a specific gravity greater than that of the lubricating oil is separated, the water can be taken into the measurement chamber 12 and a higher mixed water concentration is measured. In other words, the safety side can be monitored. This embodiment is the same as the first embodiment shown in FIG. 1 except for the matters specifically described.

Next, a test method for obtaining an appropriate threshold value S1 set in the abnormality diagnosis unit 10a in the mixed water concentration abnormality diagnosis means 10 in the state monitoring device of the rolling device of each of the above embodiments will be described.
FIG. 11 is a conceptual diagram showing an example of a test apparatus used for this test method. The rolling / sliding fatigue life test apparatus includes a test apparatus main body 140, a test apparatus main body control device 141 for controlling the test apparatus main body 140, and a moisture concentration calculating means 142. The test apparatus main body 140 includes a test oil tank 101 in which lubricating oil 5A is put in a state in which a rolling part simulation body 3A that is a test object is immersed, and rolling that operates the rolling part simulation body 3A in the test oil tank 101. The component simulated body drive device 120, the syringe pump 104 that is a water injection means for injecting water into the lubricating oil in the test oil tank 101, and the capacitance measuring means that measures the capacitance of the lubricating oil 5A in the test oil tank 101. It has a certain capacitance meter 105 and a thermocouple 106 which is an oil temperature measuring means for measuring the oil temperature of the lubricating oil 5A in the test oil tank 101.
The rolling part simulated body 3A is a part that imitates a rolling part for testing by including, as a component, a test part of a rolling part material made of a steel material. In the illustrated example, the rolling part simulated body 3A is a model of a thrust ball bearing which is a kind of rolling part, and is configured by providing a rolling element 3c composed of a ball between an inner ring 3a and an outer ring 3b. The outer ring 3b is a device under test. The outer ring 3b, which is a test object in the rolling component simulated body, has a cylindrical shape and an end surface thereof becomes a rolling surface. Further, in this rolling part simulated body 3A, the size of the rolling element 3c is made larger than the thrust bearing which is an actual rolling part. In the actual thrust bearing to be simulated, the rolling elements are too small, and the maximum surface pressure of the contact surface is considerably increased by applying a slight load. Therefore, the rolling element 3c is enlarged in the rolling component simulated body 3A. The inner ring 3a is specially manufactured and used having a groove in which such a large rolling element 3c can roll.

  The moisture concentration calculating means 142 is a means for calculating the concentration of mixed water in the lubricating oil from the capacitance measured by the capacitance meter 105 and the oil temperature measured by the thermocouple 106 according to a predetermined relationship. The moisture concentration calculating means 142 has a relationship setting means 143 that defines the relationship between the capacitance, the oil temperature, and the mixed moisture concentration by a calculation formula, a table, etc., and from the inputted capacitance and the oil temperature, The mixed water concentration is calculated using the relationship set in the relationship setting means 143.

The test device main body control device 141 includes a rolling component simulated body control unit 144 that controls the rolling component simulated body drive device 120, a pump control unit 145 that controls the syringe pump 104, the test device main body 140, and other drive parts. And a control unit (not shown) for controlling. The test apparatus main body control apparatus 141 is a computer-type sequencer or numerical control apparatus, and includes a computer such as a personal computer and a program executed on the computer.
The moisture concentration calculating means 142 is composed of a computer such as a personal computer and a program executed on the computer. The moisture concentration calculating means 142 may be one using a computer constituting the test apparatus main body control apparatus 141 or one using a computer independent of the test apparatus main body control apparatus 141.

  This rolling / sliding fatigue life test method is performed as follows using the test apparatus having the above-described configuration. The rolling part simulated body 3A, which is a test object, is immersed in the lubricating oil 5A placed in the test oil tank 101 to operate, and the rolling sliding fatigue life of the outer ring 3b, which is the test object constituting the rolling part simulated body 3A. Perform the test. Here, the syringe pump 104 is used to inject water as a hydrogen source into the lubricating oil 5A, and the electrostatic capacity of the lubricating oil 5A measured by the capacitance meter 105 and the oil temperature measured by the thermocouple 106. The moisture concentration calculation means 142 is used to measure the mixed moisture concentration in the lubricating oil 5A.

In the test apparatus shown in the figure, an oil bath lubrication mechanism is used as a mechanism for putting the lubricating oil 5A into the test oil tank 101, and the mixed water concentration in the lubricating oil 5A in the test oil tank 101 is measured. The “oil bath lubrication mechanism” refers to a mechanism in which lubricating oil is stored in the test oil tank 1 and the rolling component simulated body is lubricated with the stored lubricating oil. An appropriate water injection amount obtained from the measured mixed water concentration is fed back to the syringe pump 104, and the mixed water concentration is controlled by changing the water injection amount. That is, the pump control unit 145 changes the amount of injection by the syringe pump 104 according to a predetermined rule according to the mixed water concentration output by the water concentration calculation means so that the mixed water concentration falls within a predetermined range. Let Further, a current is passed between the contact elements of the rolling component simulated body 3A (specifically, between the pair of raceways 3a and 3b) by the energizing means 147 to measure the metal contact rate. In the rolling part simulated body driving apparatus 120, the main shaft 107 of the servo motor 107A is directly connected to the spindle 108 that is connected to the inner ring 3a that is a component of the rolling part simulated body 3A and operates the rolling part simulated body 3A. To swing. That is, it is rotated forward and reverse. The spindle 108 may have the rolling part simulated body 3A as one of the constituent elements. The main shaft 107 and the spindle 108 of the servo motor are connected by an insulating coupling 132. A ceramic rolling element bearing 133 is used as a support bearing for the spindle 108.
As described above, the rolling part simulation body 3A is a part simulating a thrust ball bearing in this embodiment, and the outer ring 3b serving as a test body is fixedly installed on an installation base (not shown) or the like, and the inner ring 3 a is fixed to the spindle 108.

  The spindle 108 and the ceramic rolling element bearing 133 constitute a head portion 146 of the rolling component simulated body driving device 120. The head unit 146 is a mechanism unit that operates one or one set of the rolling component simulated body 3 </ b> A in the rolling component simulated body driving device 120. In this embodiment, only one head portion 146 is provided. However, a plurality of head portions 146 may be provided to test a plurality of rolling component simulated bodies 3A at the same time.

  By the way, in the hydrogen brittleness resistance evaluation by the rolling and sliding fatigue life test, the penetration concentration of diffusible hydrogen into the steel cannot be controlled. It is an accelerated test under severe conditions and does not simulate actual machine conditions. Regarding the evaluation of hydrogen embrittlement resistance of steel materials, there is an evaluation by controlling the penetration concentration of diffusible hydrogen. In contrast, hydrogen embrittlement resistance evaluations such as the type of lubricating oil, additives to the lubricating oil, and surface treatment of the contact surface of the contact element are based on rolling slip fatigue where the intrusion concentration of diffusible hydrogen cannot be controlled as in this embodiment. It is necessary to evaluate with a life test. Therefore, the rolling slip fatigue life test simulating the actual machine as closely as possible effectively causes early damage due to hydrogen embrittlement, and the rolling element of this embodiment is ascertained according to the use conditions. The sliding fatigue life test method is effective. From the viewpoint of obtaining understanding from the user, it is desirable to carry out hydrogen embrittlement evaluation by a rolling sliding fatigue life test for steel materials.

In view of the usage conditions of various rolling parts that cause early damage due to hydrogen embrittlement, a rolling sliding fatigue life test having the following functions (1) to (5) is desirable. In addition, although the oil bath lubrication mechanism is used for each head portion in FIG. 11 so that the head portions 146 in the test apparatus do not affect each other, a circulating oil supply mechanism may be used. Even if it is an oil bath lubrication mechanism or a circulating oil supply mechanism, different heads can be tested under different conditions if they are provided in each head portion.
(1) Water as a hydrogen source is injected into the lubricating oil 5A.
(2) Monitor the mixed water concentration in the lubricating oil 5A with the capacitance and the oil temperature.
(3) Feed back the water injection amount obtained from the mixed water concentration monitored in (2), and control the mixed water concentration by changing the water injection amount. (4) Not only constant rotation speed and one-way rotation, Acceleration / deceleration operation and swing motion are possible.
(5) Energization is possible.

  Regarding the function of (1), there is a method of periodically replacing the lubricating oil mixed with water, but the efficiency is poor because the number of man-hours and holiday replacement cannot be performed. Therefore, it is desirable to inject water with the syringe pump 104 or the tube pump as in this embodiment. The syringe pump 104 is suitable for microinjection. In the test apparatus of FIG. 11 that uses an oil bath lubrication mechanism for the head portion 146, the water injection point is the test oil tank 101. Moreover, when using a circulating oil supply mechanism for the head part 146, the water injection | pouring location is made into the test oil tank 101 or the circulating oil supply part.

  When providing the function (2), it should be noted that the saturated water concentration of mineral oil-based lubricant oil is at most 200 ppm by weight. The mixed water concentration can be measured by the capacitance and the oil temperature, but the capacitance meter 5 for measuring the capacitance is roughly classified into the following two types. One can be measured only up to a saturated water concentration or less, and the other can be measured even if the saturated water concentration is exceeded and a cloudy state occurs. The former type is more common, but some of the latter types can be measured even when the concentration of mixed water is 10% or more. In a rolling and sliding fatigue life test in which water-containing oil having a concentration of 200 ppm by weight is periodically replaced, no adverse effect on water is observed. Mineral oil based additive-free lubricating oil has a very small saturated water concentration, but synthetic oil-based lubricating oil and mineral oil also have a very high saturated water concentration depending on the type of additive. The former type capacitance meter can be used to measure the saturated water concentration of the lubricating oil 5A. If the relationship between the mixed water concentration and the rolling sliding fatigue life is obtained, the saturated water concentration inherent to the lubricating oil is obtained. It may be an indicator of hydrogen embrittlement resistance.

Regarding the function of (3), even when water of a certain concentration is mixed in the lubricating oil 5A and the rolling sliding life test is performed as a macroscopically closed system, the mixed water concentration is greatly reduced after about 3 hours. . Even when water is continuously injected into the lubricating oil 5A at a constant flow rate, it can be easily imagined that the mixed water concentration changes. For the function (1), water is injected as a hydrogen source. For this purpose, the appropriate water amount obtained from the mixed water concentration is fed back by the capacitance and oil temperature in the function (2), and water injection is performed. It is desirable to keep the mixed water concentration within a predetermined range by changing the amount.

Speaking of the function (4), the actual rolling component 3 is not used at a constant rotational speed and in one-way rotation. Therefore, it is desirable that acceleration / deceleration operation and swing motion can be performed in addition to constant rotation speed and one-way rotation. For acceleration / deceleration operation, it is necessary to be able to set at least a pattern as shown in FIG. That is, the acceleration _{(r max -r min) / t} a, high-speed rotation speed _{r max,} the retention time _{t max} at high rotational speed, deceleration _{(r max -r min) / t} d, the low-speed rotational speed _{r max,} slow Six parameters of the holding time t _min in the number of revolutions can be arbitrarily set, and the acceleration / deceleration is repeated with this as one pattern. In the oscillating motion, unlike the case of rotation, the vibration does not change greatly even if damage occurs. In the swing motion by the crank mechanism, the vibration is superimposed, so that even if damage occurs, it is difficult to detect by vibration. In order to be able to detect damage accurately by vibration, the main shaft 107 of the servo motor and the spindle 108 of the test mechanism having the rolling part simulated body 3A as one of the components are directly connected as shown in FIG. It is necessary to eliminate the superimposed vibration component as much as possible by performing the swing motion. Furthermore, it is necessary to increase the rigidity of the spindle 108 of the test mechanism as much as possible. As the swing motion condition, it is desirable that the swing angle and frequency can be set arbitrarily. When the servo motor main shaft 107 and the test mechanism spindle 108 are directly connected, it is difficult to give a speed change of a trigonometric function waveform like a crank mechanism. In order to make this possible, the servo motor amplifier may be controlled by a sequencer program.

The purpose of providing the function (5) is as follows.
One is to pass a weak current between the contact elements of the rolling component simulated body 3A to measure the metal contact rate of the contact surface. The other is to apply a large current of about 1 A between the contact elements to wear the positive electrode side. By utilizing this phenomenon and making the test piece the positive electrode side, the newly formed metal surface can be positively exposed at the contact portion of the test piece, and the generation and penetration of hydrogen can be promoted. This is also disclosed in Non-Patent Document 9.

  In the rolling / sliding fatigue life test method using the test apparatus of FIG. 11, all the functions (1) to (5) are satisfied, and it is assumed that the rolling component simulated body 3A is swung. The main shaft 107 of 107A and the spindle 108 of the test mechanism are directly connected. When the swing operation is not required, it is preferable to drive the spindle 108 of the test mechanism with a belt with an inexpensive induction motor or the like rather than an expensive servo motor with a rated rotational speed of at most 3000 rpm. In this case, if a pulley mechanism is provided in the drive transmission diameter for transmitting the drive of the servo motor 107A to the spindle 108 and the pulley ratio is changed, the rotational speed of the spindle 108 of the test mechanism can be increased, and the speed difference of the acceleration / deceleration operation can be reduced. It is also effective to enlarge. In addition, when using a circulating oil supply mechanism for the head part 146, it is good to use a tube pump etc. with a comparatively quick oil supply speed. In this case, it is desirable to make the inflow and outflow amounts of the lubricating oil equal so as to keep the lubricating oil amount in the test oil tank 101 as constant as possible.

  In the conceptual diagram of the test apparatus shown in FIG. 11, the case where the rolling component simulated body 3A is a thrust bearing type is shown, but also in the case of the thrust bearing type, the rotation direction and the revolution direction of the steel ball are different. Slip occurs at the contact surface between the test piece and the steel ball in the part simulation body 3A. Furthermore, in order to positively give a slip to the contact surface, the motion mechanism of the contact element may be devised. When a gear material is evaluated as the rolling part simulated body 3A, since a larger slip acts on the gear, for example, the difference in peripheral speed between the test piece and the object in contact with it is forcibly changed, and a large slip acts on the contact surface. It is necessary to devise it.

  FIG. 13 and FIG. 14 show, as a conceptual diagram, another example of a test apparatus used for this rolling / sliding fatigue life test method. In the test apparatus of FIG. 13, a circulating oil supply mechanism 109 is used as a mechanism for putting the lubricating oil 5 </ b> A into the test oil tank 1. The circulation oil supply mechanism 109 here is configured by providing a circulation pump 111, a capacitance meter 105, and a thermocouple 106 in the middle of the circulation path 110. Even in this case, the capacitance meter 105 and the thermocouple 106 may be provided in the test oil tank 101 as shown in FIG.

  Here, when the mixed state of water into the lubricating oil 5A is not good, the capacitance value becomes unstable as the mixed water concentration increases. Therefore, it is desirable to measure the capacitance in a state where the lubricating oil 5A and water are well mixed. Therefore, in the test apparatus of FIG. 14, in the test apparatus of FIG. 13, a reserve tank 112 is provided between the outlet of the lubricating oil 5 </ b> A of the test oil tank 101 and the circulation pump 111, and the lubricating oil 5 </ b> A is accumulated therein to be magnetic. Stirring is performed with a stirrer 113 or the like, and the capacitance and temperature are measured. The thermocouple 106 is provided in the reserve tank 112. In order to sufficiently mix the lubricating oil 5A and water, it is better to reduce the volume of the reserve tank 112 to increase the stirring effect. As a guide, the amount of lubricating oil is desirably 100 mL or less. It is further desirable that water having a specific gravity greater than that of the lubricating oil 5A is easily discharged from the test oil tank 101 and the reserve tank 112. Therefore, in the test apparatus of FIG. 14, the discharge ports for the lubricating oil 5A of the test oil tank 101 and the reserve tank 112 are the bottom corner portions 101a and 112a (shown with a circle in the figure). Further, the inside of each of the test oil tank 1 and the reserve tank 112 may be formed in a columnar shape, and groove-like recesses 101aa and 112aa that are recessed on the outer corner side that becomes so-called smudging are provided continuously around the entire circumference of the bottom corners 101a and 112a. desirable. By these measures, it becomes easy to circulate an additive substance having a specific gravity larger than that of water.

In the test method using the test apparatus of FIGS. 11, 13, and 14, water is injected into the test oil tank 101 using the syringe pump 104. In the following, water-mixed oil in the test oil tank 1 is periodically replaced. A specific example of the rolling and sliding fatigue life test method performed in the above is shown.
Using a bearing steel SUJ2, a tapered outer ring test piece (ground finish after heat treatment, inner diameter raceway surface roughness Rq≈0.03 μm) 114 shown in FIG. 15A was manufactured. The heat treatment was performed by heating in an RX gas atmosphere at 850 ° C. for 50 minutes, followed by tempering at 180 ° C. for 120 minutes. In the test, as shown in FIG. 15B, a tapered outer ring test piece 114, an inner ring (SUJ2 standard quenching and tempering product) 115 of an angular ball bearing 7306B, a steel ball (SUJ2 standard quenching and tempering product, 13 pieces). ) 116 and the retainer 117 were combined to perform the rolling component simulated body 3A. The reason why the outer ring test piece 114 is tapered is that when the steel ball 116 rotates with the contact angle, the steel ball 116 spins and slips on the contact surface with the outer ring test piece 114. When slipping occurs, the frequency of early damage due to hydrogen embrittlement increases.

FIG. 16 shows a schematic diagram of a test apparatus used in this specific test method. In the figure, the left side mechanism is the evaluation side 120a, and the right side is the dummy side 120b. In the figure, the tapered outer ring test piece 114 to be damaged is hatched. Only the axial load Fa = 2.94 kN was applied, and the inner ring 112 was rotated at 2733 min ⁻¹ . The lubricating oil used additive-free turbine oil VG100 (density 0.887 g / cm ^3, kinematic viscosity ^{100.9mm 2 /s@40℃,11.68mm 2 / s @ 100} ℃), it 200 wt ppm, 5 Weight percent pure water was mixed. 60 mL of water-mixed oil was added to the evaluation side, and the inlet (lower side) and outlet (upper side) of the lubricating oil were connected by a tube 118 to form a closed system. Since the flow of the lubricating oil is generated by the pump action in the direction indicated by the arrow in FIG. 12B, the water-containing oil is circulated and stirred. The test was conducted for 20 hours, and if no damage occurred during that time, it was replaced with a newly prepared water-mixed oil. The test for 20 h and the exchange of water-containing oil were repeated until damage occurred. Damage detection was performed with a vibrometer. The central cylindrical roller bearing 119 in the test apparatus shown in FIG. 16 is for applying a radial load, and is not related to the current test.

  The maximum contact surface pressure between the outer ring test piece 114 and the steel ball 116 in the elastic Hertz contact calculation when only the axial load Fa = 2.94 kN is applied is 3 GPa. In the elastic Hertz contact calculation, the Young's modulus E and Poisson's ratio ν were E = 204 GPa and ν = 0.3, which are actually measured values of the SUJ2 standard quenching and tempering product. The oil film parameter between the tapered outer ring specimen 114 and the steel ball 116 in the elastohydrodynamic lubrication calculation ignoring water contamination is about 3. However, the surface roughness of the steel ball 116 was constant at an actual measurement value Rq = 0.178 μm. The calculated calculation life L10h of the tapered outer ring shape test piece 114 is 2611h when calculated by converting into a two-cylinder model. A method for obtaining L10h is disclosed in Non-Patent Document 10. However, the effect of slip was ignored.

  During the test with an initial mixed water concentration of 5% by weight, a small amount of lubricating oil was periodically sampled, and the mixed water concentration was measured by a coulometric titration method to examine the change with time. As a result, as shown by the graph in FIG. 17, the concentration of the mixed water was significantly reduced from about 3 hours later. As mentioned above, although it is a closed system, it is macroscopic and it is impossible to completely eliminate the gap. It is thought that the water evaporated from a small gap that was not visually recognized. The results of this rolling and sliding fatigue life test are as shown in Table 1.

  In the case of 200 ppm by weight of water-mixed oil, all five test pieces were not damaged until 1000 h, and the test was terminated. On the other hand, with 5 wt% water-mixed oil, early damage on the order of 1/100 of the calculated life occurred in all five test pieces. The damage form was an internal origin type peeling starting from the surface layer. Although the maximum contact surface pressure of 3 GPa also acts on the SUJ2 steel balls 116, no peeling occurred. It is considered that the steel ball 116 has a larger effective load volume than the tapered outer ring test piece 114. It can be said that there is no influence of water when it reaches the upper limit of the saturated moisture concentration of the lubricating oil used this time, not reaching the service life. On the other hand, when a large amount of water is mixed, hydrogen is generated, and it is considered that internal origin-type peeling occurred very early due to hydrogen entering the steel. Table 1 shows L10, L50, and e (Weibull slope) obtained by applying the life and the two parameter Weibull distribution when 5% by weight of water-containing oil is periodically replaced.

Next, a specific example of a rolling and sliding fatigue life test method performed by injecting a small amount of water into the lubricating oil 5A in the test oil tank 101 at a constant flow rate as in the test apparatus of FIGS.
The test piece 114 shown in FIG. 15 and the test apparatus shown in FIG. 16 which are the same as those in the above test method are used. The oil inlet (lower side) and outlet (upper side) were connected by a tube 118 to form a closed system. Simultaneously with the start of the test, pure water was continuously injected from the middle part of the tube 118 by the syringe pump 104 (FIG. 11). The injection rate of pure water was 0.5 mL / h. In this case, the time-dependent change of the mixed water concentration was not measured, but it can be easily imagined from this result that the mixed water concentration also changes in this case. The results of this rolling and sliding fatigue life test are as shown in Table 2.

  Also in the case of the test results shown in Table 2, all six test pieces suffered early damage with the same life as when the 5% by weight water-mixed oil as the previous test method was periodically replaced. The damage form was an internal origin type peeling starting from the surface layer. Moreover, although the maximum contact surface pressure of 3 GPa also acts on the SUJ2 steel balls 16, no peeling occurred. Table 2 shows L10, L50, and e (Weibull slope) obtained by applying the lifetime to the 2-parameter Weibull distribution.

Next, a specific example of the measurement of the saturated water concentration and the mixed water concentration of the lubricating oil by the capacitance meter 105 will be described.
As described above, the moisture concentration in the lubricating oil can be measured by the capacitance and temperature, and the capacitance meter 105 to be used is roughly classified into the following two types. One is capable of measuring only up to a saturated water concentration or less, and the other is capable of measuring even when the saturated water concentration is exceeded and a cloudy state occurs.
First, the saturated moisture concentration of the lubricating oil was measured using a capacitance meter 105 that can measure only up to a saturated moisture concentration. Lubricating oil is VG100 additive-free turbine oil used in the specific example of the rolling and sliding fatigue life test. As schematically shown in FIG. 18 (A), lubricating oil was put into a container 121 (for example, the test oil tank 1 in the test apparatus of FIG. 11) to which the capacitance meter 5 was attached, and a silica gel container was provided. The top lid 122 was attached, heated to 110 ° C. while stirring with a magnetic stirrer 113 capable of adjusting the temperature, and left for 1 hour. During this time, a trace amount of water mixed in the oil was evaporated and adsorbed onto silica gel. Thereafter, as schematically shown in FIG. 18B, pure water was injected at a constant rate of 0.05 mL / h using the syringe pump 4 while maintaining the temperature at 40 ° C. FIG. 19 shows the change in capacitance with time. The used capacitance meter 105 outputs a value of 0 to 1 as the water activity. “0” is when the mixed water concentration is zero, and “1” is when the mixed water concentration is equal to or higher than the saturated water concentration. As shown in FIG. 19, since the measured value becomes 1 at 167 ppm by weight, the value becomes the saturated water concentration. If the relationship between the mixed water concentration and the rolling and sliding fatigue life is examined, the saturated water concentration inherent to the lubricating oil may be an index of hydrogen embrittlement resistance.

Next, using a capacitance meter 105 that can be measured even when the saturated moisture concentration is exceeded and white turbidity is obtained, the capacitance is measured by changing the moisture concentration in the lubricating oil. As the lubricating oil, the VG100 additive-free turbine oil used in the specific example of the rolling and sliding fatigue life test was used. As schematically shown in FIG. 20A, 70 to 80 mL of lubricating oil and pure water are mixed in a 100 mL beaker 131 (for example, the test oil tank 1 in the test apparatus of FIG. 11) and mixed thoroughly. Stirring was performed while maintaining the temperature at 33 ° C. using a magnetic stirrer 113 capable of adjusting the temperature. Thereafter, as shown in the schematic diagram of FIG. 20B, a capacitance meter 105 was attached to measure the capacitance. The result is shown in FIG. From the results, a linear relationship between the mixed water concentration and the capacitance was obtained. Further, the capacitance of the lubricating oil without water mixing was measured while raising the temperature from about 25 ° C. (room temperature) to about 115 ° C. The result is shown in FIG. From the results, a linear relationship between the mixed water concentration and the capacitance was obtained. As can be seen from FIGS. 18 and 19, the capacitance depends on the mixed water concentration and the oil temperature. Capacitance can be obtained by obtaining a plurality of relationships as shown in FIG. 21 and FIG. 22 in the range of mixed moisture concentration and temperature that can change, and making the objective variable a function of the mixed moisture concentration, the dependent variable as the capacitance, and the oil temperature. And the moisture concentration can be determined from the oil temperature.
In obtaining the calibration curves as shown in FIGS. 21 and 22, it is desirable to measure not only the new oil but also the used oil with different usage conditions.

  According to the rolling and sliding fatigue life test method of the above embodiment, the rolling component simulated body 3A including the test object as a component is immersed in the lubricating oil 5A stored in the test oil tank 1 to operate, and water is contained in the lubricating oil 5A. Is injected, and the mixed water concentration in the lubricating oil 5A is measured for the capacitance and the oil temperature, so that there is little disturbance and the actual machine is faithfully simulated. Then, by proactively causing early damage due to hydrogen embrittlement, a countermeasure element corresponding to the use condition can be determined.

Next, specific examples of the vibration abnormality abnormality diagnosis device 51 of FIG. 1 will be described with reference to FIGS.
[Specific Example 1]
23, the vibration sensor 70 is installed in a bearing that constitutes the rolling device 1 in FIG. 1, for example, the main shaft bearing 460 in FIG. The vibration sensor 70 detects the vibration of the bearing and outputs the detected value to the abnormality diagnosis device 51 for vibration abnormality in the data processing device 2. As described above, the vibration sensor 70 includes an acceleration sensor using a piezoelectric element.
The abnormality diagnosis device 51 for vibration abnormality includes high-pass filters (hereinafter referred to as “HPF (High Pass F11ter)”) 510 and 550, effective value calculation units 520 and 560, an envelope processing unit 540, and a storage unit 580. And a diagnosis unit 590. The effective value calculation unit 520 is a “first calculation unit” in the claims, and the effective value calculation unit 560 is a “second calculation unit” in the claims.

  The HPF 510 receives the detection value of the vibration of the bearing from the vibration sensor 70. Then, the HPF 510 passes a signal component higher than a predetermined frequency and blocks the low frequency component. The HPF 510 is provided to remove a direct current component included in the vibration waveform of the bearing. Note that the HPF 510 may be omitted if the output from the vibration sensor 70 does not include a DC component.

The effective value calculation unit 520 receives the vibration waveform of the bearing from which the DC component is removed from the HPF 510. Then, the effective value calculation unit 520 calculates the effective value of the vibration waveform of the bearing (“RMS (Root Mean
Square) value. ) And the calculated effective value of the vibration waveform is output to the storage unit 580.

  The envelope processing unit 540 receives the detected vibration value of the bearing from the vibration sensor 70. Envelope processing section 540 generates an envelope waveform of the vibration waveform of the bearing by performing envelope processing on the received detection signal. Various known methods can be applied to the envelope processing calculated in the envelope processing unit 540. As an example, the vibration waveform of the bearing measured using the vibration sensor 70 is rectified to an absolute value, and low-pass By passing through a filter (LPF (Low Pass Filter)), an envelope waveform of the vibration waveform of the bearing 6 is generated.

  The HPF 550 receives the envelope waveform of the vibration waveform of the bearing from the envelope processing unit 540. Then, the HPF 550 allows a signal component higher than a predetermined frequency to pass through the received envelope waveform and blocks a low-frequency component. The HPF 550 is provided to remove a direct current component included in the envelope waveform and extract an alternating current component of the envelope waveform.

  The effective value calculator 560 receives from the HPF 550 the envelope waveform from which the DC component has been removed, that is, the AC component of the envelope waveform. Then, the effective value calculation unit 560 calculates the effective value (RMS value) of the AC component of the received envelope waveform, and outputs the calculated effective value of the AC component of the envelope waveform to the storage unit 580.

  The storage unit 580 synchronizes and stores the effective value of the bearing vibration waveform calculated by the effective value calculation unit 520 and the effective value of the alternating current component of the envelope waveform calculated by the effective value calculation unit 560 every moment. . The storage unit 580 is configured by, for example, a readable / writable nonvolatile memory.

  The diagnosis unit 590 reads the effective value of the vibration waveform of the bearing and the effective value of the alternating current component of the envelope waveform, which are stored in the storage unit 580 from time to time, from the storage unit 580, and based on the two subsequent real values. Diagnose bearing abnormalities. The threshold value S2 is used for this abnormality diagnosis. Specifically, the diagnosis unit 590 diagnoses an abnormality of the bearing based on a temporal change of the effective value of the vibration waveform of the bearing and the effective value of the AC component of the envelope waveform.

  That is, the effective value of the vibration waveform of the bearing calculated by the effective value calculation unit 520 is the effective value of the raw vibration waveform that has not been subjected to the envelope processing. For impulse vibrations where the signal increases only when the rolling element passes through the separation point, the increase in the value is small, and it occurs continuously due to rough contact or poor lubrication between the race and the rolling element. For vibration, the value increases greatly.

  On the other hand, the effective value of the AC component of the envelope waveform calculated by the effective value calculation unit 560 is small and increases in some cases with respect to the continuous vibration generated when the raceway surface is rough or lubrication is poor. However, the increase of the value becomes large for the impulse vibration. Therefore, in this specific example 1, by using the effective value of the vibration waveform of the bearing and the effective value of the AC component of the envelope waveform, it is possible to detect an abnormality that cannot be detected by only one of the effective values, and more accurate abnormality diagnosis. Is feasible.

  24 to 27 are diagrams showing the vibration waveform of the bearing measured using the vibration sensor 70. 24 to 27 show vibration waveforms when the rotation speed of the main shaft 420 (FIG. 2) is constant.

  FIG. 24 is a diagram showing a vibration waveform of the bearing when no abnormality occurs in the bearing. Referring to FIG. 24, the horizontal axis represents time, and the vertical axis represents the degree of vibration representing the magnitude of vibration.

  FIG. 25 is a diagram showing a vibration waveform of the bearing that is seen when surface roughness or poor lubrication of the bearing ring of the bearing occurs. Referring to FIG. 25, when surface roughness or poor lubrication of the raceway occurs, the vibration level increases and a state in which the vibration level increases continuously occurs. There are no noticeable peaks in the vibration waveform. Therefore, for such a vibration waveform, the effective value of the vibration waveform (output of the effective value calculation unit 520 (FIG. 23)) and the effective value of the AC component of the envelope waveform (effective value calculation) when no abnormality occurs in the bearing. As compared with the output of the unit 560 (FIG. 23), the effective value of the raw vibration waveform not subjected to the envelope processing increases, and the effective value of the AC component of the envelope waveform does not increase so much.

  FIG. 26 is a diagram showing a vibration waveform of the bearing at an initial stage when separation occurs in the raceway transfer of the bearing. Referring to FIG. 26, the initial stage of the separation abnormality is a state in which separation occurs in a part of the raceway, and a large vibration is generated when the rolling element passes through the separation portion. Vibration occurs periodically according to the rotation of the shaft. When the rolling element passes through a part other than the separation point, the increase in vibration level is small. Therefore, when such a vibration waveform is compared with the effective value of the vibration waveform when no abnormality occurs in the bearing and the effective value of the alternating current component of the envelope waveform, the effective value of the alternating current component of the envelope waveform increases. The effective value of the vibration waveform does not increase so much.

  FIG. 27 is a diagram showing a vibration waveform of the bearing seen in the final stage of the separation abnormality. Referring to FIG. 27, the final stage of the separation abnormality is a state in which the separation is transferred to the entire area of the raceway, and the degree of vibration increases as a whole compared to the initial stage of the abnormality, and the pulse vibration The tendency to become weaker. Therefore, when such vibration waveform is compared with the effective value of the vibration waveform and the effective value of the alternating current component of the envelope waveform at the initial stage of the separation abnormality, the effective value of the raw vibration waveform is increased, and the alternating current component of the envelope waveform is increased. The effective value decreases.

  FIG. 28 shows the temporal values of the effective value of the vibration waveform of the bearing and the effective value of the AC component of the envelope waveform when separation occurs in a part of the bearing ring of the bearing and then the separation shifts to the entire area of the bearing ring. It is the figure which showed the change. FIG. 28 and FIG. 29 described below show temporal changes of the respective effective values when the rotation speed of the main shaft 420 is constant.

  Referring to FIG. 28, a curve k1 shows a temporal change in the effective value of the vibration waveform not subjected to the envelope process, and a curve k2 shows a temporal change in the effective value of the AC component of the envelope waveform. At time t1 before the separation occurs, both the effective value (kl) of the vibration waveform and the effective value (k2) of the AC component of the envelope waveform are small. Note that the vibration waveform at time t1 is the waveform shown in FIG.

  When separation occurs in a part of the bearing ring of the bearing, as described with reference to FIG. 26, the effective value (k2) of the alternating current component of the envelope waveform greatly increases, while the effective value of the vibration waveform that is not subjected to the envelope processing. (K1) does not increase that much (near time t2).

  Thereafter, when the separation is transferred to the entire area of the raceway, as described with reference to FIG. 27, the effective value (k1) of the vibration waveform not subjected to the envelope processing is greatly increased, while the effective value of the AC component of the envelope waveform is increased. (K2) decreases (near time t3).

  FIG. 29 is a diagram showing temporal changes in the effective value of the vibration waveform of the bearing and the effective value of the AC component of the envelope waveform when surface roughness or poor lubrication of the bearing ring of the bearing occurs. Referring to FIG. 29, similarly to FIG. 28, a curve k1 indicates a temporal change in the effective value of the vibration waveform not subjected to the envelope process, and a curve k2 indicates a temporal change in the effective value of the AC component of the envelope waveform. Showing change.

  At time t11 before the occurrence of surface roughness or poor lubrication during track transfer, both the effective value (k1) of the vibration waveform and the effective value (k2) of the AC component of the envelope waveform are small. Note that the vibration waveform at time t11 is as shown in FIG.

  When surface roughness or poor lubrication of the bearing ring of the bearing occurs, as described in FIG. 25, the effective value (k1) of the vibration waveform not subjected to the envelope processing increases, while the effective value of the AC component of the envelope waveform. There is no increase in (k2) (near time t12).

  As described above, the bearing abnormality diagnosis is more accurately performed based on the transition of the temporal change between the effective value (k1) of the raw vibration waveform not subjected to the envelope processing and the effective value (k2) of the AC component of the envelope waveform. Can be done.

  As described above, according to the first specific example, the effective value of the vibration waveform of the bearing measured using the vibration sensor 70 and the envelope waveform generated by the envelope processing on the vibration waveform measured using the vibration sensor 70. Since the bearing abnormality is diagnosed on the basis of the effective value of the AC component, more accurate abnormality diagnosis can be realized as compared with the conventional frequency analysis technique. Further, unnecessary maintenance can be reduced, and the cost required for maintenance can be reduced.

[Specific Example 2]
When the rotational speed of the main shaft 420 (FIG. 2) changes, the magnitude of vibration of the bearing such as the main shaft bearing 460 changes. In general, the vibration level of the bearing increases as the rotational speed of the main shaft increases. Therefore, in this specific example 2, the effective value of the vibration waveform of the bearing and the effective value of the alternating current component of the envelope waveform are normalized by the rotational speed of the main shaft 420, and the abnormality diagnosis of the bearing is performed using each normalized effective value. Done.

  FIG. 30 is a functional block diagram functionally showing the configuration of the abnormality diagnosis means 51 for vibration abnormality in the second specific example. Referring to FIG. 30, abnormality diagnosing means 51 includes a modified vibration degree calculating unit 530, a modified modulation degree calculating unit 570, and a speed function generating unit in the configuration of abnormality diagnosing means 51 in specific example 1 shown in FIG. 600.

  The speed function generation unit 600 receives a detection value of the rotation speed of the main shaft 420 by the rotation sensor 210. The rotation sensor 210 may output a detection value of the rotational position of the main shaft 420 and the speed function generator 600 may calculate the rotational speed of the main shaft 420. Then, the speed function generator 600 normalizes the effective value of the bearing vibration waveform calculated by the effective value calculator 120 with the rotational speed N of the main shaft 420, and an effective value calculator. A speed function B (N) for normalizing the effective value of the AC component of the envelope waveform calculated by 560 with the rotational speed N of the main shaft 420 is generated. As an example, the speed functions A (N) and B (N) are expressed by the following equations.

A (N) = a × N ^−0.5 (1)
B (N) = b × N ^−0.5 (2)
Here, a and b are constants determined in advance by experiments or the like, and may be different values or the same values.

  The corrected vibration degree calculation unit 530 receives the effective value of the vibration waveform of the bearing from the effective value calculation unit 520 and receives the speed function A (N) from the speed function generation unit 600. Then, the corrected vibration product calculating unit 530 uses the speed function A (N) to normalize the effective value of the vibration waveform calculated by the effective value calculating unit 520 with the rotation speed of the main shaft 420 (hereinafter referred to as “corrected vibration”). Called "degree"). Specifically, using the effective value vr of the vibration waveform calculated by the effective value calculator 520 and the speed function A (N), the corrected vibration degree vr * is calculated by the following equation.

ここで、Ｖｒａは、時間０〜ＴにおけるＶｒの平均値を示す。
そして、修正振動座算出部５３０は、式（３）により算出された修正振動座Ｖｒ＊を記億部５８０へ出力する。

Here, Vra indicates an average value of Vr at time 0 to T.
Then, the corrected vibration seat calculation unit 530 outputs the corrected vibration seat Vr * calculated by the equation (3) to the storage unit 580.

  The modified modulation degree calculation unit 570 receives the effective value of the AC component of the envelope waveform from the effective value calculation unit 560 and receives the speed function B (N) from the speed function generation unit 600. Then, the modified modulation degree calculation unit 570 uses the speed function B (N) to normalize the effective value of the alternating current component of the envelope waveform calculated by the effective value calculation unit 560 with the rotation speed of the main shaft 420 (hereinafter referred to as “the actual value”). (Referred to as “modified modulation degree”). Specifically, using the RMS value Ve and the velocity function B (N) of the alternating current component of the envelope waveform calculated by the RMS value calculation unit 560, the modified modulation degree Ve * is calculated by the following equation.

Here, Vea shows the average value of Ve in time 0-T. The modified modulation degree calculation unit 570 outputs the modified modulation degree Ve * calculated by Expression (4) to the storage unit 580.
Then, the corrected vibration degree calculation unit 530 outputs the corrected vibration degree Vr * calculated by Expression (3) to the storage unit 580.

  Then, the corrected vibration degree Vr * and the corrected modulation degree Ve * stored in the storage unit 580 are read by the diagnosis unit 590, and the read corrected vibration degree Vr * and the corrected modulation degree Ve * are temporally changed. Based on this transition, the diagnosis unit 590 performs bearing abnormality diagnosis.

  In the above description, the rotation sensor 210 may be attached to the main shaft 420, or a bearing with a rotation sensor in which the rotation sensor 210 is incorporated in the bearing may be used for the bearing to be diagnosed.

  As described above, according to this specific example 2, the correction value Vr * obtained by normalizing the effective value of the vibration waveform of the bearing by the rotation speed and the correction value obtained by normalizing the effective value of the AC component of the envelope waveform by the rotation speed. Since abnormality is diagnosed based on the degree of modulation Ve *, it is possible to remove disturbance due to fluctuations in rotational speed and realize more accurate abnormality diagnosis.

[Specific Example 3]
In this specific example 3, in order to perform a more accurate abnormality diagnosis, in addition to the above specific example 1 or specific example 2, an abnormality diagnosis by frequency analysis is used in combination.
FIG. 31 is a functional block diagram functionally showing the configuration of the abnormality diagnosis means 51 for vibration abnormality in the third specific example. Referring to FIG. 31, abnormality diagnosis unit 51 further includes frequency analysis units 620 and 630 in the configuration of abnormality diagnosis unit 51 shown in FIG.

  The frequency analysis unit 620 receives the vibration waveform of the bearing from which the DC component has been removed from the HPF 510. Then, the frequency analysis unit 620 performs frequency analysis on the received vibration waveform of the bearing, and outputs the frequency analysis result to the storage unit 580. As an example, the frequency analysis unit 620 performs a fast Fourier transform (FFT) process on the vibration waveform of the bearing received from the HPF 510 and outputs a peak frequency exceeding a preset threshold value to the storage unit 580.

  Further, the frequency analysis unit 630 receives from the HPF 550 the AC component of the envelope waveform from which the DC component has been removed. Then, frequency analysis unit 630 performs frequency analysis on the AC component of the received envelope waveform and outputs the frequency analysis result to storage unit 580. As an example, frequency analysis unit 630 performs an FFT process on the AC component of the envelope waveform received from HPF 350 and outputs a peak frequency exceeding a preset threshold value to storage unit 580.

  Then, the diagnosis unit 590 reads out the frequency analysis results by the frequency analysis units 620 and 630 together with the corrected vibration degree Vr * and the corrected modulation degree Ve * from the storage unit 580, and temporally calculates the corrected vibration degree Vr * and the corrected modulation degree Ve *. By using the frequency analysis result together with the transition of the change, a more reliable abnormality diagnosis is performed.

  For example, the frequency analysis results obtained by the frequency analysis units 620 and 630 can be used to estimate a site where an abnormality has occurred when an abnormality is detected by an abnormality diagnosis based on the corrected vibration degree Vr * and the corrected modulation degree Ve *. . That is, when damage occurs inside the bearing, a vibration peak occurs at a specific frequency that is theoretically determined from the geometric structure and rotation speed inside the bearing, depending on the damaged part (inner ring, outer ring, rolling element). To do. Therefore, by using the frequency analysis results by the frequency analysis units 620 and 630 in combination with the abnormality diagnosis based on the above-described corrected vibration degree Vr * and corrected modulation degree Ve *, it becomes possible to diagnose the abnormality occurrence site more accurately. .

  In the above description, the frequency analysis units 620 and 630 are added in the specific example 2. However, the frequency analysis units 620 and 630 are added to the abnormality diagnosis unit 51 in the specific example 1 shown in FIG. May be.

  As described above, according to the third specific example, the abnormality diagnosis based on the frequency analysis is used together, so that the reliability of the abnormality diagnosis can be further improved and the abnormality occurrence site can be diagnosed more accurately.

[Specific Example 4]
In the fourth specific example, detection values of various sensors are used in combination in order to further improve the reliability of the bearing abnormality diagnosis. Concrete example 4 includes vibration abnormality diagnosis means 52, internal crack abnormality diagnosis means 53, and impurity abnormality diagnosis means 54 shown in FIG. 1 instead of or in addition to these abnormality diagnosis means 52-54. The abnormality abnormality diagnosis means 51 is added with functions of the displacement abnormality, internal cracks, and impurity abnormality.

  FIG. 32 is a functional block diagram functionally showing the configuration of the abnormality diagnosis unit 51 for vibration abnormality in the fourth specific example. Referring to FIG. 32, abnormality diagnosis unit 51 includes a diagnosis unit 590 </ b> A instead of diagnosis unit 590 in the configuration of abnormality diagnosis unit 51 shown in FIG. 32.

  In the fourth specific example, in addition to the vibration sensor 70 and the rotation sensor 210, a displacement sensor 240, an AE (Acoustlc Emlssion) sensor 250, a temperature sensor 260, and a magnetic iron powder sensor (hereinafter referred to as “magnetic type sensor” 270). At least one of which is referred to as “iron powder sensor 270”. Diagnosis unit 590A receives a detection value from at least one of displacement sensor 240, AE sensor 250, temperature sensor 260, and magnetic iron powder sensor 270 provided therein. Diagnosis unit 590A reads corrected vibration degree Vr *, corrected modulation degree Ve *, and frequency analysis results by frequency analysis units 620 and 630 from storage unit 580.

  Diagnosis unit 590A includes displacement sensor 240, AE sensor 250, temperature sensor 260, and magnetic iron powder sensor 270 together with corrected vibration degree Vr *, corrected modulation degree Ve *, and frequency analysis results by frequency analysis units 620 and 630. An abnormality diagnosis of the bearing is performed by using the detection value received from at least one together.

  The displacement sensor 240 is attached to the bearing, detects the relative displacement of the inner ring with respect to the outer ring of the bearing 60, and outputs it to the diagnosis unit 590A. In the above-described corrected vibration degree Vr * and corrected modulation degree Ve * using the detection value of the vibration sensor 70 and the frequency analysis method, it is difficult to detect an abnormality with respect to the overall wear of the rolling surface. By detecting the displacement by the displacement sensor 240, it is possible to detect wear inside the bearing. When the detection value from displacement sensor 240 exceeds a preset value (threshold value S3), diagnosis unit 590A determines that an abnormality has occurred in the bearing. Since the displacement sensor 240 detects the relative displacement between the outer ring and the inner ring, it is necessary to maintain the accuracy of the non-measurement surface with high quality.

  The AE sensor 250 is attached to the bearing, detects an acoustic emission wave (AE signal) generated from the bearing, and outputs it to the diagnosis unit 590A. The AE sensor 250 is excellent in detecting internal cracks in the members constituting the bearing. By using the AE sensor 250 in combination, an abnormal separation caused by an internal crack that is difficult to detect by the vibration sensor 70 is detected at an early stage. Can be detected. Diagnosis unit 590A determines that the number of times that the amplitude of the AE signal detected by AE sensor 250 exceeds the set value exceeds threshold S4, or the detected AE signal or a signal obtained by envelope processing of AE signal is a threshold. If the value is exceeded, it is determined that an abnormality has occurred in the bearing.

  The temperature sensor 260 is attached to the bearing, detects the temperature of the bearing, and outputs it to the diagnosis unit 590A. Generally, a bearing generates heat due to poor lubrication or insufficient clearance inside the bearing, and becomes non-rotatable when it becomes seized after discoloration or softening of the rolling surface. Therefore, by detecting the temperature of the bearing with the temperature sensor 260, an abnormality such as poor lubrication can be detected at an early stage. In place of the temperature sensor 260 attached to the bearing, the oil temperature measuring means 8 for detecting the oil temperature may be used.

  Then, when the corrected vibration degree Vr * and the corrected modulation degree Ve * behave as shown in FIG. 29, the diagnosis unit 590A further refers to the detection value of the temperature sensor 260 to diagnose abnormality such as poor lubrication. To do. Diagnosis unit 590A may determine that an abnormality has occurred in the bearing only when the detected value from temperature sensor 260 exceeds a preset value.

  The temperature sensor 260 is constituted by, for example, a thermistor, a platinum resistor, a thermocouple, or the like.

  The magnetic iron powder sensor 270 detects the amount of iron powder contained in the bearing lubricant and outputs the detected value to the diagnosis unit 590A. The magnetic iron powder sensor 270 is constituted by, for example, an electrode with a built-in magnet and a rod-like electrode, and is provided in a circulation route for the lubricant in the bearing. The magnetic iron powder sensor 270 captures the iron powder contained in the lubricant with a magnet, and outputs a signal when the electrical resistance between the electrodes falls below a set value due to the adhesion of the iron powder. That is, when the bearing is worn, the iron powder generated by the wear is mixed with the lubricant. Therefore, the wear of the bearing 60 is detected by detecting the amount of iron powder contained in the bearing lubricant by the magnetic iron powder sensor 270. Can do. When receiving the signal from the magnetic iron powder sensor 270, the diagnosis unit 590A determines that an abnormality has occurred in the bearing 60.

  Although not particularly illustrated, an optical sensor that detects the contamination of the lubricant by the light transmittance may be used instead of the magnetic iron powder sensor 270. For example, the optical sensor irradiates the lubricating oil with light from the light emitting element, and detects the amount of bearing wear powder in the lubricating oil based on a change in the intensity of the light reaching the light receiving element. The light transmittance is defined by the ratio between the output value of the light receiving element in a state where no foreign matter is mixed in the lubricating oil and the output value of the light receiving element when iron oxide is mixed, and the diagnosis unit 590A transmits the transmitted light. If the rate exceeds the set value, it is determined that an abnormality has occurred in the bearing.

  In FIG. 32, the displacement sensor 240, the AE sensor 250, the temperature sensor 260, and the magnetic iron powder sensor 270 are shown. However, it is not always necessary to provide all of them. By providing at least one sensor, abnormality diagnosis can be performed. Reliability can be increased.

  According to this specific example 4, as described above, the detection values of various sensors are used in combination with the abnormality diagnosis, so that the reliability of the abnormality diagnosis can be further improved. In particular, by using the displacement sensor 240 in combination, it is possible to diagnose the wear inside the bearing, and by using the AE sensor 250 in combination, it is possible to diagnose a separation abnormality caused by an internal crack at an early stage. Further, by using the temperature sensor 260 in combination, it is possible to diagnose an abnormality such as poor lubrication at an early stage, and by using the magnetic iron powder sensor 270 and an optical sensor that detects contamination of the lubricant by light transmittance, etc. in combination. The wear of the bearing can be diagnosed.

  The displacement abnormality diagnosis means 52, the internal crack abnormality diagnosis means 53, and the impurity abnormality diagnosis means 54 of FIG. 1 are, in other words, the displacement abnormality abnormality diagnosis and the internal crack abnormality in the diagnosis unit 590A of FIG. Means for performing each function of diagnosis and abnormality diagnosis of impurities is provided independently of the abnormality diagnosis means 51 for vibration abnormality.

  FIG. 33 shows an expanded example of the state monitoring device for the rolling device in this wind turbine generator. Since the nacelle 490 (FIG. 2) is installed at a high place, it is desirable that the state monitoring device of the wind power generator is originally installed at a location away from the nacelle 490 in consideration of maintainability. However, transferring the vibration waveform of the bearing itself measured using the vibration sensor 70 to a remote place requires a transmission means having a high transfer speed, resulting in an increase in cost. Considering that the nacelle 490 is installed at a high place as described above, it is desirable to use wireless communication as a communication means from the nacelle 490 to the outside.

  Therefore, in the example of FIG. 33, the data processing provided in the nacelle 490 is performed for the calculation of the moisture concentration, the calculation of the corrected vibration degree Vr * and the corrected modulation degree Ve *, and the frequency analysis processing (when frequency analysis is used in combination). The data of the moisture concentration, the corrected vibration degree Vr * and the corrected modulation degree Ve *, and the frequency analysis result (peak frequency) which are executed in the apparatus and transmitted are transmitted from the nacelle 490 to the outside by radio. The data wirelessly transmitted from the nacelle 490 is received by a communication server connected to the Internet, and transmitted to the diagnosis server via the Internet to perform bearing abnormality diagnosis.

  FIG. 33 is a diagram schematically showing the overall configuration of the rolling device state monitoring device in the wind turbine generator using the communication means to the remote place. Referring to FIG. 33, the wind power generation apparatus state monitoring apparatus includes a wind power generation apparatus 400, a communication server 310, the Internet 320, and a bearing state diagnosis server 330.

  The configuration of the wind turbine generator 400 is as described with reference to FIGS. As will be described later, in the data processing device of the wind turbine generator 400 in this example, a wireless communication unit is provided instead of the diagnosis unit. Then, the wind turbine generator 400 uses the detection value of the vibration sensor 70 (FIG. 1) to calculate the above-described corrected vibration degree Vr * and corrected modulation degree Ve * and the frequency analysis result (when using frequency analysis together), The calculation result is output to communication server 310 by radio.

  Communication server 310 is connected to the Internet 320. Then, the communication server 310 receives data transmitted from the wind power generator 400 by radio, and outputs the received data to the bearing state diagnosis server 330 via the Internet 320. The bearing state diagnosis server 330 is connected to the Internet 320. Then, the bearing state diagnosis server 330 receives data from the communication server 310 via the Internet 320, and the corrected vibration degree Vr * and the corrected modulation degree Ve * calculated in the wind power generator 400 and the frequency analysis result (frequency analysis is performed). Based on the above, the abnormality diagnosis of the bearing provided in the wind turbine generator 400 is performed.

[Specific Example 5]
FIG. 34 is a functional block diagram functionally showing the configuration of the abnormality diagnosis means 51 for vibration abnormality in the data processing apparatus included in the wind turbine generator 400 shown in FIG. Referring to FIG. 34, abnormality diagnosis unit 51 includes a wireless communication unit 280 in place of diagnosis unit 590 in the configuration of abnormality diagnosis unit 51 shown in FIG. The wireless communication unit 280 continues the corrected vibration degree Vr * and the modified modulation degree Ve * and the frequency analysis result by the frequency analysis units 620 and 630 from the storage unit 580, and wirelessly transmits the continued data to the communication server 310 (FIG. 33). ).

  The other configuration of the abnormality diagnosis unit 51 shown in the figure is the same as that of the abnormality diagnosis unit 51 shown in FIG.

  In the above description, it is assumed that wireless communication is performed between the nacelle 490 and the communication server 310, but the nacelle 490 and the communication server 310 may be connected by wire. In this case, although wiring is required, it is not necessary to separately provide a wireless communication device, and generally, wired information can be transmitted more, so that processing is performed on the main board in the nacelle 490. Can be aggregated.

  Moreover, it is desirable that the above-described wind power generation apparatus state monitoring apparatus is configured independently of the existing power generation monitoring system. By comprising in this way, the introduction cost of the state monitoring apparatus of a wind power generator can be suppressed, without adding a change to the existing system.

As described above, according to the fifth specific example, since the bearing abnormality diagnosis provided in the wind turbine generator 400 is performed in the bearing condition diagnosis server 330 provided in the remote place, the maintenance load and cost can be reduced. it can.

  In addition, since the nacelle 490 is installed at a high place and the working environment is inferior, the signal output from the nacelle 490 is made wireless by providing the wireless communication unit 280 and the communication server 310, so that the wiring work in the nacelle 490 is performed. Wiring work in the tower 500 that supports the nacelle 490 can be minimized.

  1 may be provided in the data processing device 2 installed in the nacelle 490, or may be provided in the bearing state diagnosis server 330 in FIG.

In addition, although the said embodiment demonstrated about the case where it applied to the rolling device 1 which comprises a wind power generator, this invention is a rolling device which comprises other various machines, for example, an industrial machine, a machine tool, The present invention can be applied to state monitoring in a rolling device constituting a construction machine or the like.
Moreover, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims for patent.

DESCRIPTION OF SYMBOLS 1 ... Rolling device 2 ... Data processing device 3 ... Rolling component 3A ... Rolling component simulation body 4 ... Housing 4a ... Lubricating oil storage tank 5 ... Lubricating oil 6 ... Mixed water concentration monitoring device 7 ... Capacitance detection means 7A ... Capacitance / oil temperature means 8 ... oil temperature measuring means 9 ... moisture concentration calculation means 10 ... mixed water concentration abnormality diagnosis means 10a ... abnormality diagnosis unit 11 ... state monitoring means 26 ... planetary gear 51 ... abnormality diagnosis of vibration abnormality Means 52 ... Displacement abnormality diagnosis means 53 ... Internal crack abnormality diagnosis means 54 ... Impurity abnormality diagnosis means 55 ... Comprehensive abnormality diagnosis means 70 ... Vibration sensor 210 ... Rotation sensor 240 ... Displacement sensor 250 ... AE sensor 270 ... Impurity Sensor 400 ... Wind power generator 420 ... Main shaft 430 ... Blade 440 ... Speed increaser 450 ... Generator 460 ... Main shaft bearing 461 ... Main shaft bearing device 490 ... Nacelle 500 ... Tower 51 , 550 ... HPF
520, 560 ... RMS value calculation unit,
530 ... Modified vibration product calculation unit 540 ... Envelope processing unit 570 ... Modified modulation degree calculation unit 580 ... Storage unit 590, 590A ... Diagnosis unit 600 ... Speed function generation unit 620, 630 ... Frequency analysis unit 680 ... Wireless communication units S1-S5 ... threshold

Claims (22)

  A state monitoring unit having a function of monitoring the concentration of water contained in the lubricating oil of the rolling device is provided, and the state monitoring unit is configured to detect the electrostatic capacitance in the lubricating oil of the rolling device and the oil temperature. Detecting means and oil temperature measuring means; moisture concentration calculating means for detecting a mixed water concentration according to a predetermined rule from the capacitance and oil temperature detected by these capacitance detecting means and oil temperature measuring means; and A rolling device state monitoring device comprising: a vibration sensor that monitors vibrations of a bearing that constitutes the rolling device; and a vibration abnormality abnormality diagnosis unit that determines abnormality of the bearing using an output of the vibration sensor.   2. The state monitoring device for a rolling device according to claim 1, wherein the rolling device has an oil bath lubrication mechanism for lubricating the bearing, and the state monitoring means monitors the lubricating oil of the bearing.   The rolling device state monitoring device according to claim 1, wherein the rolling device includes a circulating oil supply mechanism that lubricates the bearing, and the state monitoring unit monitors the lubricating oil of the bearing.   4. A capacitance and oil temperature measurement chamber according to claim 1, wherein the capacitance detection means and the oil temperature measurement means are installed inside or outside the housing of the rolling device. The state monitoring device of the rolling device provided with   4. The state monitoring device for a rolling device according to claim 3, wherein the circulating oil supply mechanism of the rolling device is provided with a capacitance and oil temperature measurement chamber.   6. The state monitoring device for a rolling device according to claim 4 or 5, wherein a stirring means for stirring the lubricating oil in the capacitance and oil temperature measurement chamber is provided.   7. The state monitoring device for a rolling device according to claim 3, wherein the amount of lubricating oil accumulated in the capacitance and oil temperature measurement chamber is 100 mL or less and the variation is ± 5 mL. .   The rolling device according to any one of claims 3 to 7, further comprising means for facilitating discharge of water and additives having a specific gravity greater than that of the lubricating oil from the rolling device and the capacitance and oil temperature measurement chamber. A state monitoring device for moving devices.   9. The rolling device according to claim 1, wherein a sensor capable of measuring a capacitance and an oil temperature is integrated as the capacitance detecting means and the oil temperature measuring means. State monitoring device. The abnormality diagnosis means for vibration abnormality according to any one of claims 1 to 9,
A first arithmetic unit that calculates an effective value of the vibration waveform measured using the vibration sensor; and an envelope waveform of the vibration waveform by performing envelope processing on the vibration waveform measured using the vibration sensor. An envelope processing unit for generating
A second calculation unit that calculates an effective value of an alternating current component of the envelope waveform generated by the envelope processing unit;
A diagnosis unit for diagnosing an abnormality of the rolling bearing based on an effective value of the vibration waveform calculated by the first calculation unit and an effective value of an AC component of the envelope waveform calculated by the second calculation unit; A rolling device state monitoring device. The rotation sensor for detecting the rotational speed of the axis | shaft supported by the said rolling bearing or the said rolling bearing in Claim 10,
The abnormality diagnosis means for vibration abnormality is:
A modified vibration degree calculation unit for calculating a corrected vibration degree obtained by normalizing the effective value of the vibration waveform calculated by the first calculation unit with the rotation speed;
A modified modulation degree calculation unit that calculates a modified modulation degree obtained by normalizing the effective value of the alternating current component of the envelope waveform calculated by the second calculation unit with the rotation speed;
The diagnosis unit is a state monitoring device for a rolling device that diagnoses an abnormality of the rolling bearing based on a change in temporal change of the correction vibration degree and the correction modulation degree.   12. A displacement meter for detecting a relative displacement between inner and outer rings in a bearing constituting the rolling device according to any one of claims 1 to 11, and an abnormality of the bearing using an output of the displacement meter. A state monitoring device for a rolling device provided with an abnormality diagnosis means for determining a displacement abnormality.   13. The bearing according to claim 1, wherein an abnormality of the bearing is determined using an AE sensor for detecting an acoustic emission wave in a bearing constituting the rolling device and an output of the AE sensor. A state monitoring device for a rolling device provided with an abnormality diagnosis means for abnormal internal cracks.   The impurity abnormality according to any one of claims 1 to 13, wherein a sensor for detecting an amount of wear powder or other impurities in the lubricating oil is provided, and an abnormality of the lubricating oil is determined using an output of the sensor. The state monitoring device of the rolling device provided with the abnormality diagnosis means.   15. The abnormality diagnosis unit according to claim 1, wherein the abnormality diagnosis unit detects an abnormality when a mixed water concentration detected by the water concentration calculation unit exceeds a predetermined threshold value. A state monitoring device for a rolling device in which a threshold value or a determination method for determining the change is changed.   The rolling device according to any one of claims 1 to 15, further comprising an abnormality diagnosis unit for mixed water concentration that is determined to be abnormal when the water concentration calculation unit reaches a predetermined threshold value. Condition monitoring device.   The rolling device state monitoring device according to claim 1, wherein the rolling device is provided in a wind power generator. The contamination water concentration in the lubricating oil of the rolling device is monitored using the state monitoring device of the rolling device according to any one of claims 1 to 17, and the detected contamination water concentration is abnormal. This is a method for performing an abnormality diagnosis to determine whether or not there is a process for obtaining a threshold value for abnormality diagnosis based on a mixed water concentration.
Water is injected into the lubricating oil by the water injection means, the capacitance and oil temperature are measured to monitor the mixed water concentration, and an appropriate amount of water obtained from the mixed water concentration obtained from the measurement result is determined by the water injection means. The threshold value of the mixed water concentration is obtained by a rolling-slip fatigue life test in which the water injection amount is controlled so as to keep the mixed water concentration within a certain range by feeding back to the mixed water concentration. Method for monitoring the state of a rolling device used for diagnosis of abnormalities in a car. The contamination water concentration in the lubricating oil of the rolling device is monitored using the state monitoring device of the rolling device according to any one of claims 1 to 17, and the detected contamination water concentration is abnormal. This is a method for performing an abnormality diagnosis to determine whether or not there is a process for obtaining a threshold value for abnormality diagnosis based on a mixed water concentration.
A method for monitoring the condition of a rolling device for obtaining a threshold value of a mixed water concentration by a rolling sliding fatigue life test that causes a slip on a contact surface by a motion mechanism between contacting elements and using the value for an abnormality diagnosis of the mixed water concentration . The contamination water concentration in the lubricating oil of the rolling device is monitored using the state monitoring device of the rolling device according to any one of claims 1 to 17, and the detected contamination water concentration is abnormal. This is a method for performing an abnormality diagnosis to determine whether or not there is a process for obtaining a threshold value for abnormality diagnosis based on a mixed water concentration.
A method for monitoring the condition of a rolling device for obtaining a threshold value of a mixed water concentration by a rolling sliding fatigue life test for forcibly causing a slip on a contact surface between contacting elements and using the value for an abnormality diagnosis of the mixed water concentration . The contamination water concentration in the lubricating oil of the rolling device is monitored using the state monitoring device of the rolling device according to any one of claims 1 to 17, and the detected contamination water concentration is abnormal. This is a method for performing an abnormality diagnosis to determine whether or not there is a process for obtaining a threshold value for abnormality diagnosis based on a mixed water concentration.
A rolling device state monitoring method for obtaining a threshold value of a mixed water concentration by a rolling / sliding fatigue life test in which acceleration / deceleration is performed until damage occurs, and using the value for an abnormality diagnosis of the mixed water concentration. The contamination water concentration in the lubricating oil of the rolling device is monitored using the state monitoring device of the rolling device according to any one of claims 1 to 17, and the detected contamination water concentration is abnormal. This is a method for performing an abnormality diagnosis to determine whether or not there is a process for obtaining a threshold value for abnormality diagnosis based on a mixed water concentration.
Rolling-slip fatigue life test that uses ceramic rolling elements for the spindle support bearing and insulates the motor from the spindle of the test unit, in order to promote wear of the damaged object by passing current between the contact elements with the damaged object as the positive electrode side. A state monitoring method for a rolling device, wherein a threshold value of the mixed water concentration is obtained by the method and the value is used for the abnormality diagnosis of the mixed water concentration.

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