WO2020215256A1 - Composant de palier avec capteur, et système de surveillance de jeu de palier - Google Patents

Composant de palier avec capteur, et système de surveillance de jeu de palier Download PDF

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Publication number
WO2020215256A1
WO2020215256A1 PCT/CN2019/084126 CN2019084126W WO2020215256A1 WO 2020215256 A1 WO2020215256 A1 WO 2020215256A1 CN 2019084126 W CN2019084126 W CN 2019084126W WO 2020215256 A1 WO2020215256 A1 WO 2020215256A1
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WO
WIPO (PCT)
Prior art keywords
sensor
bearing
antenna
axle box
end cover
Prior art date
Application number
PCT/CN2019/084126
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English (en)
Chinese (zh)
Inventor
关冉
王爱萍
Original Assignee
舍弗勒技术股份两合公司
关冉
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 舍弗勒技术股份两合公司, 关冉 filed Critical 舍弗勒技术股份两合公司
Priority to CN201980094047.XA priority Critical patent/CN113574290B/zh
Priority to PCT/CN2019/084126 priority patent/WO2020215256A1/fr
Publication of WO2020215256A1 publication Critical patent/WO2020215256A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts
    • G01M13/04—Bearings

Definitions

  • the invention relates to the field of bearings, and in particular to a bearing assembly with sensors and a bearing clearance monitoring system.
  • bearings wheelset bearings for rail trains (hereinafter referred to as bearings)
  • the temperature of the bearings will rise during the high-speed train travel. Due to the effect of thermal expansion and contraction, the clearance between the inner ring and the outer ring of the bearing is reduced, which may cause the bearing to lock in severe cases. Therefore, it is necessary to monitor the temperature of the inner ring and outer ring of the bearing.
  • Infrared temperature sensors are installed near the train tracks to detect the temperature of the axles or axle boxes of passing vehicles. This method does not directly detect the temperature of the bearing, and can only indirectly measure the bearing temperature when the vehicle passes the sensor, but cannot measure the bearing temperature in real time. In addition, the infrared temperature sensor is easily damaged, especially considering that it is installed in an outdoor environment.
  • a sensor is installed in the bearing housing and brought into contact with the stationary ring of the bearing (opposite the rotating ring, the stationary ring in the wheel set bearing is the outer ring of the bearing) to measure the temperature of the stationary ring.
  • Chinese patent CN1276245C discloses a technical solution for detecting the stationary ring of a bearing using a wireless temperature sensor.
  • the temperature change of the bearing's rotating ring is also worth monitoring.
  • Chinese patent CN100344974C discloses a bearing with a wireless self-powered sensor unit.
  • the sensor is installed between the inner ring and the outer ring (that is, the rotating ring and the stationary ring) of the bearing, so that the bearing can be measured The internal temperature.
  • the arrangement of the sensor inside the bearing will affect the transmission of the sensor signal.
  • the internal space of the bearing is small, which is not conducive to installing the transceiver antenna of the wireless sensor.
  • the purpose of the present invention is to overcome or at least alleviate the above-mentioned shortcomings of the prior art, and provide a bearing assembly capable of accurately measuring the condition of the movable ring of the bearing in real time.
  • a bearing assembly with a sensor which includes an axle box seat, an axle box end cover, a bearing, and a sensor assembly.
  • the bearing is arranged in the inner cavity of the axle box seat, and the shaft
  • the box end cover is fixed to the axial end of the axle box seat, the bearing includes a movable ring, and the movable ring can rotate or creep relative to the axle box seat, wherein,
  • the sensor component includes a sensor, a sensor antenna and a transceiver antenna,
  • the sensor is fixed to the end of the movable ring close to the end cover of the axle box in the axial direction, and the sensor is electrically connected with the sensor antenna,
  • the sensor can measure the change of the state of the movable coil and transmit the measured state signal to the sensor antenna, and the sensor antenna can wirelessly transmit the state signal to the surroundings,
  • the transceiving antenna is fixed on the end surface of the axle box end cover facing the bearing, and the transceiving antenna can receive the status signal transmitted by the sensor antenna.
  • the inner ring of the bearing is the movable ring, the inner ring is assembled on the outer circumference of the shaft with an interference fit, and the inner ring can rotate relative to the axle box seat, A shaft end cover is fixed to the axial end of the shaft facing the shaft box end cover,
  • the sensor assembly includes a first sensor assembly, the first sensor assembly includes a first sensor and a first sensor antenna, and the first sensor is fixed to the inner ring near the axle box end cover in the axial direction. At the end, the first sensor is electrically connected to the first sensor antenna,
  • the shaft end cover has a middle hole axially penetrating the shaft end cover, and the first sensor antenna is fixed to the shaft end cover and is at least partially contained in the middle hole.
  • the first sensor antenna is fixed to the shaft end cover by a connecting piece
  • the connecting piece is in the shape of a bent sheet
  • one end of the connecting piece is fixed to the shaft end cover, so A part of the connecting piece is bent axially inward to extend into the middle hole, and the first sensor antenna is fixed to a part of the connecting piece that extends into the middle hole.
  • the first sensor assembly further includes a first cable assembly
  • the shaft end cover further has a side hole axially penetrating the shaft end cover
  • the first cable assembly passes through the side hole, and two ends of the first cable assembly are respectively connected to the first sensor and the first sensor antenna.
  • the outer ring of the bearing is stationary relative to the axle box seat
  • the sensor assembly further includes a second sensor assembly, the second sensor assembly including a second sensor and a second cable assembly,
  • the second sensor is fixed to the end of the outer ring that is close to the axle box end cover in the axial direction, and the second cable assembly is connected to the second sensor,
  • the second sensor can measure the change of the state of the outer ring and transmit the measured state signal to the second cable assembly.
  • the outer ring of the bearing can creep relative to the axle box seat
  • the sensor assembly further includes a second sensor assembly, and the second sensor assembly includes a second sensor, a second sensor antenna and a connection joint,
  • the second sensor is fixed to the end of the outer ring that is close to the axle box end cover in the axial direction, and the second sensor antenna is connected to the second sensor through the connection joint,
  • the second sensor can measure the change of the state of the outer ring, and transmit the measured state signal of the outer ring to the second sensor antenna, and the second sensor antenna wirelessly transmits the state signal of the outer ring to Fire around,
  • the outer ring status signal can be received by the transceiver antenna.
  • the transceiving antenna has a disk shape, and the transceiving antenna radially covers a radial area where the second sensor antenna is located.
  • the edge of the axle box end cover contacting the outer ring has a groove, and the second sensor assembly can be partially accommodated in the groove.
  • the senor is a passive temperature sensor.
  • a bearing clearance monitoring system includes the bearing assembly according to the present invention, and the system further includes a joint, a main cable, a data processing unit, and a communication Cables and computers,
  • the joint is installed on the axle box end cover, and the joint transmits the temperature signal of the inner ring measured by the first sensor assembly and the temperature signal of the outer ring measured by the second sensor assembly to the total Cable, the total cable transmits the temperature signals of the inner ring and the outer ring to the data processing unit, and the data processing unit calculates the temperature signal according to the temperature signals of the inner ring and the outer ring Bearing clearance,
  • the communication cable connects the data processing unit and the computer, and the computer displays the temperature of the bearing and/or the clearance of the bearing in a visual form.
  • the working condition (for example, temperature) of the movable ring of the bearing can be measured accurately and in real time.
  • Fig. 1 is a schematic diagram of a bearing clearance monitoring system according to an embodiment of the present invention.
  • Fig. 2 is a schematic diagram of a bearing assembly according to the first embodiment of the present invention (the axle box end cover is not shown).
  • Fig. 3 is an axial cross-sectional view of the bearing assembly according to the first embodiment of the present invention.
  • Fig. 4 is an axial sectional view of a bearing assembly according to a second embodiment of the present invention.
  • Fig. 5 is a top view of the axle box end cover shown in Fig. 4.
  • axle box seat 22 axle box end cover; 22A slot;
  • T10 first sensor component T11 first sensor; T12 first cable component; T13 first sensor antenna; T14 transceiver antenna;
  • T20 second sensor assembly T21 second sensor; T22 second cable assembly; T23 second sensor antenna; T24 connection connector.
  • the bearing assembly with sensor and the bearing clearance monitoring system introduce the bearing assembly with sensor and the bearing clearance monitoring system according to the present invention.
  • the axial direction A referred to in the present invention is consistent with the axial direction of the bearing;
  • the radial direction R referred to in the present invention is consistent with the radial direction of the bearing, and the circumferential direction referred to in the present invention is consistent with the circumferential direction of the bearing. Xiang consistent.
  • the bearing assembly with sensor according to the present invention includes an axle box, a bearing and a sensor assembly.
  • the bearing clearance monitoring system according to the present invention includes the bearing assembly according to the present invention, a data processing unit 44 and a computer 45.
  • the setting methods of the wheel set bearings can generally be divided into two types, namely (i) the inner ring 11 and the outer ring 12 are both tightly fitted (ie interference fit), and (ii) )
  • the inner ring 11 is an interference fit
  • the outer ring 12 is a clearance fit.
  • the bearing ring capable of rotating or creeping relative to the axle box seat 21 is defined as a movable ring.
  • the bearing ring mentioned here can creep relative to the axle box seat 21, which mainly means that the outer ring 12 of the bearing can creep relative to the axle box seat 21. This kind of creep is manifested in that even if the outer ring 12 is not desired in the design. It creeps relative to the axle box seat 21, but in practical applications, the outer ring 12 still creeps relative to the axle box seat 21 due to various reasons.
  • both the stationary ring and the rotating ring of the bearing may be a movable ring, and the rotating ring of the bearing is working Obviously, it rotates relative to the axle box seat 21 while the stationary ring of the bearing may creep relative to the axle box seat 21.
  • the inner ring 11 is a movable ring, and the inner ring 11 can rotate relative to the axle box seat 21.
  • the inner ring 11 and the outer ring 12 are both movable rings, the inner ring 11 can rotate relative to the axle box seat 21, and the outer ring 12 can creep relative to the axle box seat 21.
  • the bearing is installed in the axle box.
  • the axle box includes an axle box seat 21 and an axle box end cover 22 covering the end of the axle box seat 21 in the axial direction A.
  • the wireless temperature sensor assembly T10 (hereinafter also referred to as the first sensor)
  • the component T10), and the sensor component for measuring the temperature of the outer ring 12 is relatively simple to install, and a wired temperature sensor component T20 (hereinafter also referred to as the second sensor component T20) can be used.
  • the second sensor assembly T20 includes a sensor T21 (also called a second sensor T21) and a cable assembly T22 (also called a second cable assembly T22) for measuring temperature.
  • the sensor T21 is fixed on the axial end of the outer ring 12 close to the axle box end cover 22, and the cable assembly T22 is electrically connected to the sensor T21 for further transmitting the signal detected by the sensor T21 downstream.
  • connection between the sensor T21 and the outer ring 12 is, for example, a threaded connection.
  • a threaded hole extending along the axial direction A is provided at the end of the outer ring 12, and a threaded cable plug is provided at the end of the cable assembly T22 connected with the sensor T21
  • the cable connector fixes the sensor T21 to the threaded hole of the outer ring 12, so that the sensor T21 can be in good contact with the outer ring 12, and the sensor T21 is sealed against water.
  • the sensor T21 and the following sensor T11 are contact temperature sensors (also called thermometers), such as pressure thermometers, resistance thermometers, thermistors, thermocouples, and semiconductor temperature sensors.
  • the first sensor component T10 includes a sensor T11 (also called the first sensor T11) for measuring temperature, a cable component T12 (also called the first cable component T12), a sensor antenna T13 (also called the first sensor antenna T13) and Transceiver antenna T14.
  • a sensor T11 also called the first sensor T11
  • a cable component T12 also called the first cable component T12
  • a sensor antenna T13 also called the first sensor antenna T13
  • Transceiver antenna T14 Transceiver antenna
  • the sensor T11 is fixed to the axial end of the inner ring 11 close to the axle box end cover 22, for example, a threaded hole extending in the axial direction A is provided at the end of the inner ring 11 for fixing the sensor T11.
  • the cable assembly T12 connects the sensor T11 and the sensor antenna T13.
  • the transmitting and receiving antenna T14 is fixed to the end cover 22 of the axle box.
  • the inner ring 11 is connected with the shaft 31 in an interference fit, and the shaft 31 is fixed with a shaft end cover 32 by screws at one end of the shaft 31 close to the shaft box end cover 22 in the axial direction A.
  • the inner ring 11, the shaft 31, the shaft end cover 32, the sensor T11, the cable assembly T12 and the sensor antenna T13 rotate synchronously relative to the axle box, and the transceiver antenna T14 is stationary relative to the axle box.
  • the middle part of the shaft end cover 32 is provided with a middle hole 32C penetrating in the axial direction A, and the radial outside of the shaft end cover 32 is provided with a side penetrating in the axial direction A ⁇ 32B.
  • the end of the shaft end cover 32 close to the shaft box end cover 22 in the axial direction A is fixed with a connecting piece 33.
  • the connector 33 has a sheet shape (for example, a bent long sheet shape), one end of which is fixed to the shaft end cover 32 by a screw, and the other end extends inward in the radial direction R and is bent inward in the axial direction A to extend into In the middle hole 32C.
  • the sensor antenna T13 is fixed to the other end of the connecting member 33, so that the sensor antenna T13 can be at least partially accommodated in the middle hole 32C without occupying too much axial space inside the bearing assembly.
  • the sensor antenna T13 is located at the center of rotation of the shaft 31, so that when the shaft 31 rotates, the sensor antenna T13 has a small turning radius, small centrifugal force, stable motion state, and stable transmission and reception of signals.
  • the side hole 32B is connected to the threaded hole at the end of the inner ring 11 for fixing the sensor T11.
  • One end of the cable assembly T12 is connected to the sensor T11, and the other end passes through the side hole 32B and then extends radially inwardly into the middle hole 32C. Connect the sensor antenna T13.
  • the cable assembly T12 preferably uses a semi-rigid cable to ensure that it has a certain flexibility, can be bent and wired according to the space inside the bearing assembly, and has a certain strength and is easy to fix.
  • the transceiving antenna T14 is used to receive the signal of the sensor antenna T13 and transmit the signal further downstream.
  • the transceiving antenna T14 is fixed on the end surface of the axle box end cover 22 on the axial inner side.
  • the area covered by the transceiving antenna T14 in the radial direction is larger than the area covered by the sensor antenna T13 in the radial direction.
  • the sensor T11 is a passive (self-powered) sensor, which, for example, can obtain a working voltage through an electromagnetic effect or a piezoelectric effect without connecting an additional power source.
  • the wireless propagation mode of the signal of the sensor T11 is, for example, propagation through acoustic waves or radio frequency signals.
  • the passive wireless sensor for example, refer to Patent CN100344974C or Patent Publication CN105222919A, which will not be repeated in the present invention.
  • a joint 41 is provided through the axle box end cover 22, and the cables of the cable assembly T22 and the transceiver antenna T14 are gathered at the joint 41, and then output to the outside of the bearing assembly by the main cable 42 connected to the joint.
  • the main cable 42 is connected to the data processing unit 44 (refer to Figure 1).
  • the data processing unit 44 converts the real-time temperature signals collected by the sensor T21 and the sensor T11 into the bearing according to the built-in program (considering the parameters including the material and structural dimensions of the bearing) The real-time dimensional changes of the outer ring 12 and the inner ring 11.
  • the data processing unit 44 is also connected to a computer 45 through a communication cable 43.
  • the computer 45 can visualize the real-time temperature of the outer ring 12 and the inner ring 11 of the bearing and changes in the bearing clearance according to a built-in program Form display.
  • Maintenance personnel can also use the measured data as feedback data for bearing clearance design, or can set reasonable warning temperature values to provide alarms to relevant personnel.
  • the inner ring 11 rotates following the shaft 31 when the bearing is working, and the outer ring 12 may slowly creep relative to the axle box seat 21 in the circumferential direction.
  • the arrangement of the first sensor assembly T10 for measuring the temperature of the inner ring 11 is the same as that of the first embodiment, while the second sensor assembly T20 for measuring the temperature of the outer ring 12 uses the same as the first sensor assembly T10.
  • the second sensor assembly T20 includes a (second) sensor T21, a connection joint T24 and a (second) sensor antenna T23.
  • the sensor T21 is fixed on the axial end of the outer ring 12 close to the axle box end cover 22, one end of the connection joint T24 is connected to the sensor T21, and the other end extends radially inward and axially outward and connects to the sensor antenna T23.
  • the transmitting and receiving antenna T14 has a disc shape and is fixed on the end surface of the axle box end cover 22 on the axial inner side.
  • the transceiver antenna T14 covers the radial area where the sensor antenna T23 is located in the radial direction R, so the transceiver antenna T14 can receive signals from the sensor antenna T23 and the sensor antenna T13 at the same time, and even if the sensor antenna T23 follows the outer ring 12 to creep in the circumferential direction , The transceiver antenna T14 can still receive the signal from the sensor antenna T23.
  • the transceiver antenna T14 is connected to the main cable 42 through a joint 41 to further transmit the signal downstream.
  • the edge of the axle box end cover 22 that contacts the outer ring 12 is provided with a groove 22A That is, the edge of the axle box end cover 22 that is in contact with the outer ring 12 is incomplete in the circumferential direction and is interrupted in the form of notches by the groove 22A, and the second sensor assembly T20 can be partially accommodated in the groove 22A.
  • the sensor T21 and the sensor T11 are in contact with the outer ring 12 and the inner ring 11 of the bearing, respectively, and can accurately measure the temperature of the outer ring and the inner ring of the bearing in real time.
  • the sensors can be effectively connected to the movable ring of the bearing and transmit signals.
  • the transceiver antenna T14 of the wireless sensor assembly is fixed to the axle box end cover 22, and the transceiver antenna T14 does not rotate with the bearing and can receive signals from the sensor antenna.
  • the bearing assembly according to the present invention is not limited to wheelset bearing assemblies for rail vehicles.
  • the bearings in the bearing assembly can be tapered roller bearings, cylindrical roller bearings, ball bearings, spherical roller bearings (aligning roller bearings) and sliding bearings.
  • the sensor T11 and the sensor T21 may also be sensors capable of measuring other states of the bearing.
  • the sensor T11 and the sensor T21 may also be vibration sensors or acceleration sensors.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

L'invention concerne un composant de palier avec un capteur, comprenant une base de boîte d'essieu (21), un couvercle d'extrémité de boîte d'essieu (22), un palier et un composant de capteur. Le palier comprend un anneau mobile capable de tourner ou de glisser par rapport à la base de boîte d'essieu (21). Le composant de capteur comprend le capteur, une antenne de capteur et une antenne d'émission-réception (T14). Le capteur est fixé sur une partie d'extrémité de l'anneau mobile à proximité du couvercle d'extrémité de boîte d'essieu (22) dans une direction axiale (A), est électriquement connecté à l'antenne de capteur, et est capable de mesurer le changement de l'état de l'anneau mobile, et de transférer un signal d'état obtenu par mesure à l'antenne de capteur. L'antenne de capteur peut transmettre sans fil le signal d'état à l'environnement. L'antenne d'émission-réception (T14) est fixée sur une surface d'extrémité du couvercle d'extrémité de boîte d'essieu (22) faisant face au palier, et peut recevoir le signal d'état émis par l'antenne de capteur. Selon le composant de palier, l'état de fonctionnement de l'anneau mobile du palier peut être mesuré avec précision et en temps réel. La présente invention concerne en outre un système de surveillance de jeu de palier.
PCT/CN2019/084126 2019-04-24 2019-04-24 Composant de palier avec capteur, et système de surveillance de jeu de palier WO2020215256A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201980094047.XA CN113574290B (zh) 2019-04-24 2019-04-24 带传感器的轴承组件和轴承游隙监测系统
PCT/CN2019/084126 WO2020215256A1 (fr) 2019-04-24 2019-04-24 Composant de palier avec capteur, et système de surveillance de jeu de palier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2019/084126 WO2020215256A1 (fr) 2019-04-24 2019-04-24 Composant de palier avec capteur, et système de surveillance de jeu de palier

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WO2020215256A1 true WO2020215256A1 (fr) 2020-10-29

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN113686579A (zh) * 2021-08-24 2021-11-23 重庆大学 扭振自监测的双列圆锥滚子轴承及扭振监测方法
CN114136613A (zh) * 2021-10-20 2022-03-04 中国航发四川燃气涡轮研究院 一种用于发动机轴承工作状态的监测系统及在线监测方法
CN114136489A (zh) * 2021-10-21 2022-03-04 明阳智慧能源集团股份公司 一种风力发电机组齿轮箱行星轴承温度无线检测方法

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CN112525236A (zh) * 2019-09-03 2021-03-19 舍弗勒技术股份两合公司 光纤传感器轴承组件、轴承状态监测系统及测量方法

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CN108871779A (zh) * 2018-08-06 2018-11-23 浙江优特轴承有限公司 能精确检测轴承工况的一体式轴承座

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Publication number Priority date Publication date Assignee Title
CN1405543A (zh) * 2001-09-11 2003-03-26 日本精工株式会社 带检测器的滚动轴承单元
CN1412564A (zh) * 2001-10-18 2003-04-23 日本精工株式会社 转速传感器装置
DE102006035703A1 (de) * 2006-08-01 2008-02-07 Schaeffler Kg Vorrichtung zur Überwachung mindestens einer Betriebsgröße eines Radsatzlagers
CN107192555A (zh) * 2017-05-31 2017-09-22 西人马（厦门）科技有限公司 轴承的检测装置和方法
CN108871779A (zh) * 2018-08-06 2018-11-23 浙江优特轴承有限公司 能精确检测轴承工况的一体式轴承座

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113686579A (zh) * 2021-08-24 2021-11-23 重庆大学 扭振自监测的双列圆锥滚子轴承及扭振监测方法
CN113686579B (zh) * 2021-08-24 2024-01-30 重庆大学 扭振自监测的双列圆锥滚子轴承及扭振监测方法
CN114136613A (zh) * 2021-10-20 2022-03-04 中国航发四川燃气涡轮研究院 一种用于发动机轴承工作状态的监测系统及在线监测方法
CN114136613B (zh) * 2021-10-20 2023-06-09 中国航发四川燃气涡轮研究院 一种用于发动机轴承工作状态的监测系统及在线监测方法
CN114136489A (zh) * 2021-10-21 2022-03-04 明阳智慧能源集团股份公司 一种风力发电机组齿轮箱行星轴承温度无线检测方法

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CN113574290A (zh) 2021-10-29

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