CN102095548B - All-around lubricating film pressure wireless monitoring method of liquid sliding bearing - Google Patents
All-around lubricating film pressure wireless monitoring method of liquid sliding bearing Download PDFInfo
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- CN102095548B CN102095548B CN2010105725856A CN201010572585A CN102095548B CN 102095548 B CN102095548 B CN 102095548B CN 2010105725856 A CN2010105725856 A CN 2010105725856A CN 201010572585 A CN201010572585 A CN 201010572585A CN 102095548 B CN102095548 B CN 102095548B
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Abstract
The invention discloses a method for measuring the pressure of a lubricating liquid film of a liquid sliding bearing to achieve the real-time measurement of the all-around lubricating liquid film pressure of a liquid sliding journal bearing and a thrust bearing with different rotation speeds. A pressure sensor is mounted on a revolving shaft by different methods according to different shaft diameters; the sensor is connected with a wireless emission device mounted in the shaft or on the tail end of the shaft; the wireless emission device transmits the liquid film pressure signal of the bearing to the outside of a bearing rotor system while rotating together with the shaft; an external wireless receiving device receives the pressure signals so as to monitor the pressure distribution characteristics and the lubrication state of the lubricating film of the bearing in real time.
Description
Technical field:
The invention belongs to operation of industrial installation monitoring and fault diagnosis field, relate to liquid lubrication sliding bearing monitoring running states such as comprising oil or water, the Radio Transmission Technology of lubricating film method for testing pressure and test data.
Background technology:
Along with the continuous development of science and technology, various plant equipment develop towards the higher direction of high speed, robotization and complexity, for the industrialization of human lives's convenient and social production provides the foundation.But simultaneously; The trouble or failure of plant equipment generation in service not only can cause economic loss; And possibly cause catastrophic personnel casualty accidents and abominable social influence; Therefore, the development of plant equipment monitoring running state technology receives increasing attention equally equally with the development of plant equipment itself.
Rotating machinery occupies extremely important status in electric power energy, traffic, petrochemical complex, nuclear power, war production and space technology; Core component as rotating machinery; Liquid sliding bearing is increasing to be applied in the production field, particularly in some large-scale rotary systems.Characterize the good and bad major parameter of liquid sliding bearing greasy property film pressure distribution, thickness of liquid film distribution, liquid film Temperature Distribution etc. are arranged; These characteristics directly affect the quality that can whole mechanical system normally be moved and move; These parameters are implemented monitoring; Can assess the running status of bearing, significant to the safety and steady operation of equipment.To the monitoring of liquid sliding bearing liquid film pressure, can obtain the liquid film power variation characteristic in the bearing operational process, have great significance for the dynamic perfromance of research bearing arrangement and the quantification detection diagnosis of fault thereof.
Simultaneously, the lubricating film pressure distribution of sliding bearing is one of basic parameter of sliding bearing.Usually in the performance computation of sliding bearing, adopt the method for finding the solution Reynolds equation to obtain pressure distribution.But in calculating, owing to must carry out physics and mathematical approximate, make the pressure distribution of calculating, and by other important parameter of pressure distribution decision, like the lubricating fluid flow, liquid film stiffness, liquid film dampings etc. still can not reflect actual conditions fully.In the research of lubrication theory, the liquid film Research on Boundary Conditions is a question of common concern, in calculating, supposes that it is a straight border that liquid film plays initial line usually, and the liquid-sheet disintegration limit then adopts the Reynolds boundary condition to confirm.The boundary condition of regulation and some actual conditions are also not quite identical like this.In addition, when violent oscillatory motion was done at diameter of axle center, liquid film existed the situation in zone accurately to describe.Therefore; Though can try to achieve pressure distribution through calculating,, in order to confirm the influence of various assumed conditions; For research pressure distribution under new running operating mode and bearing arrangement; And, comprise the problem of pressure boundary condition through the problem that experiment solution lubrication theory others exist, all need study and propose the measuring method of pressure distribution.
Fig. 1 has provided liquid sliding bearing lubricating film synoptic diagram; Can find out because the enclosed type in lubricating film space, bearing arrangement and liquid film form the restriction of factors such as mechanism; Making measurement and the monitoring rate difficulty of the complete all lubricating film pressure in the sliding bearing rotation, also is the subject matter of this patent solution.
Axle turns round in sliding bearing, and its formed dynamic pressure distribution in bearing is not uniform.In order to understand the size distribution situation of liquid film pressure in the bearing; That generally adopts both at home and abroad has two kinds of methods; A kind of is position punchings different on bear box, is drawn out to tensimeter to pressure oil and measures, and the pressure transducer of perhaps on these positions, packing into is measured.With tensimeter or more simple and convenient from the housing measurement lubricating film pressure ratio of bearing with pressure transducer; But there is very big deficiency; Because the measuring point on the bearing shell can not be much very close; Therefore this method can only record the oil film pressure at finite point place, and can't record the continuous distribution situation of liquid film pressure in the bearing complete cycle; Secondly, if measuring point distributes too much, then itself destroys the lubricating status of bearing working face, thereby causes measuring error excessive, and is also not ideal enough for the test of mechanism property.
Another kind method is on axle, to punch; Pressure transducer is installed to goes in the revolving shaft to measure; Axle pressure transducer in rotation can record the pressure distribution on the cross section, place like this; Liquid film pressure is then measured by being contained in the pressure transducer in the main shaft and through electric brush type collector ring or mercury collector ring signal being extracted; And this method is because the undesired signal that collector ring itself contact is produced is excessive for the interference of cell pressure signal, the signal accuracy loss greatly, and in the bearing high speed rotating dynamic equilibrium problems and the integrity problem of collector ring self; And the model of collector ring product itself restriction and higher cost all limited the application of this method, is the weak point of the method.
Summary of the invention:
The present invention provides a kind of method that liquid sliding bearing lubricating liquid film pressure is measured, and realizes liquid slip under the different rotating speeds is radially measured with thrust bearing complete cycle lubricating liquid film pressure in real time.Different mining according to the diameter of axle is installed in pressure transducer in the rotating shaft with diverse ways; Sensor links to each other with the wireless launcher that is installed in an inside or tail end; Wireless launcher is sent to the bearing rotor system outside with bearing liquid film pressure signal in the process of rotating simultaneously with axle; Radio receiver by the outside receives pressure signal, and the lubricating film pressure distribution characteristic and the lubricating status of bearing are monitored in real time.
(1) group method of invention
Through in axle journal, laying sensor; Then through wireless launcher collection, pre-service and transmit the method for signal; Both can effectively obtain accurate moisture film pressure distribution information; Also can carry out obtaining of signal, avoid interference and signal accuracy loss in the signal acquisition process through radio sensing network.Not destroying bearing shell and moisture film being formed under the little situation of influence, obtain more complete moisture film pressure data on the bearing complete cycle with less sensor.The wireless transmit of data has changed traditional collector ring data mode with reception and has brought interference and the low deficiency of transfer rate, for obtaining comprehensive and high-quality data analysis result guarantee is provided.
Fig. 2 is the group method figure of invention.
Lay pressure transducer in the axle journal bearing rotor system under the different condition is carried out the measurement of moisture film pressure, can obtain moisture film pressure distribution between the sliding bearing under the incomplete moisture film lubrication circumstances.Collection, early stage that wireless launcher is accomplished the moisture film pressure data handle and transmission, and radio receiver receives the data after handling, and data are sent in the upper computer software to accomplish the post analysis and the work of treatment of data.
Therefore, adopt the method for wireless monitor, with sensor; Modulate circuit, the data acquisition and processing (DAP) module, transmitter module and supply module are made the in addition integrated and encapsulation of widget; Wireless launcher is contained on the revolving shaft rotates simultaneously with axle, then with the sensor output signal that collects through after handling early stage, directly send out through wireless transmitter module; Interference and the signal accuracy having avoided adopting collector ring transmission data to bring lose greatly, and the restriction of picking rate.
(2) sensor installation method
The pressure transducer that is generally used for the pressure test of slewing slide bearing lubricating film has piezoelectric type, strain-type, condenser type etc.; Consider the size of sensor self; Therefore for different diameter of axle sizes, need adopt and different installation methods pressure transducer to be installed in axle journal inside.
1) width-diameter ratio of bush(ing) bearing is usually in 0.5～1.5 scope; Less in the bearing width-diameter ratio; And under the bigger situation of the turning axle diameter of axle; Do diameter at the alignment of shafts and be not less than the center pit about 10cm, on the corresponding institute of the radial position of turning axle will carry out sectional position that bearing pressure measures, do the mounting hole of cooperation sensor.Can sensor be installed in through center pit on the outer wall of rotating shaft then, sensor signal links to each other with the wireless launcher that is fixed on the rotating shaft tail end, and pressure signal sends to outside radio receiver through wireless transmitter module in rotary course.Fig. 3 is the scheme of installation of the method.
In actual lubricating film measuring process, can the sampling number and the SF of sensor be set in wireless launcher according to the range of speeds of rotating shaft with to rotating needs that liquid film pressure survey weekly counts.
2) bigger in the sliding bearing width-diameter ratio; And under the less situation of the turning axle diameter of axle, can't do the center pit about 10cm at the rotating shaft center, can't be directly with hand or instrument in the inside of axle sensor installation; In this case, can adopt installation method as shown in Figure 4.
In Fig. 4; Because the sliding bearing width-diameter ratio is bigger, need carry out the lubricating film pressure test on the cross section more than 2 and 2 to bearing usually, on the cross section corresponding to pressure test; Radial direction at bearing is done through hole; Simultaneously doing diameter in the axle center is the center pit about 2cm, and the radial direction through hole of center pit one side direction is done the mounting hole that cooperates sensor, and sensor is installed in the radially mounting hole of axle in the outside of axle.And the through hole of center pit opposite side is done the balancing weight mounting hole; Balancing weight is in order to solve because the imbalance problem that has produced during at the axle high speed rotating in that sensor has been installed on the axle; Simultaneously; Can be used for the use of the various tool in the sensor installation process with the coaxial balancing weight mounting hole of sensor mounting hole, make things convenient for the fitting operation of sensor.After installing sensor, after balancing weight installed and fixed, the balancing weight surface can adopt grinding, polishing or additive method to keep combining closely with the rotating shaft outside surface and on same curved surface, impacting with the formation and the characteristic of minimizing mounting hole to lubricating liquid film.
3) bigger for the bearing width-diameter ratio, and the rotating shaft center is unfit to do under the situation of center pit, can adopt sensor installation method as shown in Figure 5.On the shaft circumference position, do the lubricating liquid film pod apertures coaxial with rotating shaft; According to the lubricating film pressure sectional position that will measure the axial depth of pod apertures is set; Do radially pod apertures at this depth location in the outside of rotating shaft then, radially pod apertures and axial diversion hole connect, and do the mounting hole that cooperates sensor in the axial diversion hole site of axle head; Can easily sensor be installed in the end or the shaft shoulder position of rotating shaft, be connected with the wireless launcher that is fixed on shaft tail end again.The sliding bearing lubricating liquid film passes to the pressure transducer that is installed in the end through radial and axial pod apertures with liquid film pressure, through wireless launcher pressure signal is sent to the outside again.
In this installation method, can according to the lubricating liquid film cross section number that will measure, on the shaft circumference position, do a plurality of axial diversions hole that is uniformly distributed with, consider the dynamic equilibrium problems of rotating shaft, be traditionally arranged to be even number, like 2,4,6,8 pod apertures.Shown in Fig. 5 two pod apertures methods measuring two trapped fluid film pressures of bearing.
(3) wireless transmit and receiving trap
Wireless launcher comprises preposing signal process circuit constant current source module, digital signal processing circuit DSP2812, MSP430 single-chip microcomputer, CC1101 radiofrequency emitting module and the supply module to the sensor power supply.Radio receiver comprises MSP430 single-chip microcomputer, CC1101 Receiver Module and supply module.Data after wireless launcher will be handled through the CC1101 radiofrequency emitting module early stage are seen off, and radio receiver receives data through the CC1101 Receiver Module and falls it via the MSP430 single-chip microcomputer through the RS485/232 interface and is sent to upper computer software and does further analysis and handle then.
Fig. 6, Fig. 7 are respectively wireless transmit and receiving trap structural drawing.
In wireless launcher, the constant current source module of built-in low-pass filter circuit is responsible for power supply to pressure transducer being provided.The signal that sensor acquisition arrives is delivered to digital signal processor DSP 2812 through after the pre-process.Digital signal processor DSP 2812 has 8 acquisition channels, and SF and sampled point number average can be provided with simultaneously.In order to reduce the data traffic volume to save the energy of wireless transmit and receiving trap, signal will be compressed and encode in DSP2812.Signal distinguishing validity program that DSP2812 is also built-in, in order to the signal that collects is done preliminary screening, the signal that surpasses setting threshold just can be seen off through CC1101 radio frequency sending module via the MSP430 single-chip microcomputer.
In radio receiver, the signal of CC1101 Receiver Module after to compression and coding receives, and sends the MSP430 single-chip microcomputer to, delivers to upper computer software through the RS485/232 interface then and decodes and decompress.Extract and analytical algorithm through the built-in signal characteristic of software at last, analyze and be presented on the software interface obtaining the moisture film pressure data.
Consider the energy consumption problem that exists in the wireless data transmission process, the wireless transmit of design and receiving trap are low-power consumption.Signal processor DSP2812 and low-power scm MSP430 all have multiple low-power consumption mode, can be provided with in program inside according to different demands.
The effect of invention
1. pressure test hole and pod apertures are set in rotating shaft; The wireless transmission method of pass test data can collect the pressure distribution curve of the complete cycle of slide bearing lubricating film in rotary course, for the monitoring of lubricating status and the analytical calculation of sliding bearing characteristic provide detailed data.
2. adopt wireless launcher that pressure data is gathered and transmit; Solved use in the past collector ring transmit signal that data bring disturb with loss of significance big, and the not enough and limited problem of data acquisition transmission speed of data transmission credibility during the rotating shaft high speed rotating.
3. to three kinds of sensor mounting meanss of different bearings and rotating shaft size design, the needs of various situation properties of journal bearing lubricated lubricating film pressure test have been solved.Adopt the balancing weight mounting means to make things convenient for the installation of sensor, efficiently solve the imbalance problem that brings behind the sensor installation.
4. the sensor mounting means of water conservancy diversion cellular type has solved in the rotating shaft needs of complete cycle liquid film pressure test can't the machining center hole time, has made things convenient for the installation and the replacing of sensor in the test process at tail end or shaft shoulder sensor installation simultaneously.
Description of drawings:
Fig. 1 liquid sliding bearing lubricating film synoptic diagram, wherein Fig. 1 a is that vertical view, Fig. 1 b are front views;
The complete all lubricating film method for testing pressure figure of Fig. 2 liquid sliding bearing
Fig. 3 sensor mounting means one
Fig. 4 sensor mounting means two
Fig. 5 sensor mounting means three
Fig. 6 wireless launcher structural drawing
Fig. 7 radio receiver structural drawing
Fig. 8 water lubricating rubber bearing
Fig. 9 water lubricating rubber bearing method of testing figure
Wherein: 1 is turning axle; 2 is lubricating liquid film; 3 is sliding bearing; 4 is the wireless collection emitter; 5 is pressure transducer; 6 is shaft coupling; 7 is motor; 8 is load and exciting bank; 9 is the forefront pressure sensor; 10 is the tail end pressure transducer; 11 is the front end balancing weight; 12 is the tail end balancing weight; 13 is rubber; 14 is copper sheathing; 15 is base; 16 is gib screw; 17 is coupling bolt; 18 is joint flange; 19 is sensor stand; 20 is an O RunddichtringO; 21 is right end cap; 22 is set bolt; 23 is axle sleeve; 24 is upper end cover; 25 is left end cap; 26 is the 2nd O RunddichtringO; 27 is motor base.
Embodiment:
Below in conjunction with accompanying drawing the present invention is done and to describe in further detail:
Referring to Fig. 1-7, the technical method that the present invention explained comprises mainly that in implementation process method of testing is selected, the test axle is that design and manufacturing, wireless transmit and receiver module are debugged, some steps such as installation and debugging, collection of experiment data and analysis of testing tool.Key step is as follows.
(1) according to the concrete size of bearing and rotating shaft; Specific requirement with the liquid film pressure test; In three kinds of sensor mounting meanss of the present invention, select a kind of installation method; Simultaneously, select measuring accuracy, measurement range and the suitable pressure transducer of response speed, test the design and the processing of mounting hole then according to the installation fit dimension countershaft of the mounting means of sensor and pressure transducer according to the specific requirement of pressure test.
(2) according to the specific requirement of pressure acquisition; Sampling channel number, SF, sampling number of wireless launcher etc. are set; The low-power consumption mode of wireless transmit and receiving trap is set; The power supply power supply of inspection wireless transmit and receiving trap, and whether the emission and the accepting state of inspection wireless device be normal in stationary state.
(3) on the test axle after machining according to selected sensor installation method sensor installation; Connect sensor and wireless launcher; Tail end in rotating shaft connects and the fixed wireless emitter, and radio receiver and follow-up liquid film pressure Analysis process software are set simultaneously.
(4) after above step is accomplished in Installation and Debugging, open wireless transmit and receiving trap switch, gather slide bearing lubricating film pressure distribution data at the rotating speed that rotating shaft needs down with load condition, while monitoring pressure curve distribution situation is also done the late time data processing.
Embodiment:
Carrying out actual measurement with the lubricating film pressure of water lubricating rubber bearing (see figure 8) under different rotating speeds and load to certain model is example, and the validity of method of testing according to the invention has been described.To the physical size of sliding bearing and rotating shaft, designed method of testing as shown in Figure 9.Adopt the electromagnetism load mode that axle is applied loading force static and transient state, in the range of speeds of 100～1500r/min, test water is lubricated the lubricating film pressure of rubber shaft bearing, obtains one group of lubricating film pressure distribution curve under the different situations through adjustable speed motor.In addition, change the pressure of supply water and the supply water temperature of water lubriucated bearing,, obtained another group lubricating film pressure distribution curve through same method according to the working condition of above speed and load mode change bearing rotor system.
Above content is to combine concrete preferred implementation to further explain that the present invention did; Can not assert that embodiment of the present invention only limits to this; Those of ordinary skill for technical field under the present invention; Under the prerequisite that does not break away from the present invention's design, can also make some simple deduction or replace, all should be regarded as belonging to the present invention and confirm scope of patent protection by claims of being submitted to.
Claims (4)
1. the complete all lubricating film pressure wireless monitoring methods of liquid sliding bearing is characterized in that, comprise the steps:
(1) according to sliding bearing and turning axle size model, selection pressure sensor and the test mounting means on axle thereof, and the test mounting hole is set in rotating shaft;
Said step (1) is meant:
Little in the bearing width-diameter ratio, under the bigger situation of the turning axle diameter of axle, do diameter at the alignment of shafts and be not less than the center pit about 10cm, on the corresponding institute of the radial position of turning axle will carry out sectional position that bearing pressure measures, do the mounting hole of cooperation sensor; Then sensor is installed in through center pit on the outer wall of rotating shaft, sensor signal links to each other with the wireless launcher that is fixed on the rotating shaft tail end, and pressure signal sends to outside radio receiver through wireless transmitter module in rotary course;
Big in the sliding bearing width-diameter ratio, under the less situation of the turning axle diameter of axle, can't do the center pit about 10cm at the rotating shaft center; Can't be directly with hand or instrument in the inside of axle sensor installation; Carry out the lubricating film pressure test on the cross section more than 2 and 2 to bearing, on cross section, do through hole in the radial direction of bearing corresponding to pressure test; Simultaneously doing diameter in the axle center is the center pit about 2cm; The radial direction through hole of center pit one side direction is done the mounting hole that cooperates sensor, sensor is installed in the radially mounting hole of axle in the outside of axle, and the through hole of center pit opposite side is done the balancing weight mounting hole;
Big for the bearing width-diameter ratio, the rotating shaft center is unfit to do under the situation of center pit, on the shaft circumference position, does the lubricating liquid film pod apertures coaxial with rotating shaft, is set to the even number pod apertures; According to the lubricating film pressure sectional position that will measure the axial depth of pod apertures is set; Do radially pod apertures at this depth location in the outside of rotating shaft then; Radially pod apertures and axial diversion hole connect; Do the mounting hole that cooperates sensor in the axial diversion hole site of axle head, sensor is installed in the end or the shaft shoulder position of rotating shaft, be connected with the wireless launcher that is fixed on shaft tail end again; The sliding bearing lubricating liquid film passes to the pressure transducer that is installed in the end through radial and axial pod apertures with liquid film pressure, through wireless launcher pressure signal is sent to the outside again;
(2), sampling channel number, SF and the sampling number of wireless launcher is set according to the specific requirement of lubricating film pressure acquisition; The low-power consumption mode of wireless transmit and receiving trap is set, the power supply power supply of inspection wireless transmit and receiving trap, and whether the emission and the accepting state of inspection wireless device be normal in stationary state;
(3) setting pressure sensor on the test mounting hole, tail end connection and fixed wireless emitter in rotating shaft connect pressure transducer and wireless launcher, and radio receiver and follow-up liquid film pressure Analysis process software are set simultaneously;
(4) after above step is accomplished in Installation and Debugging, open wireless transmit and receiving trap switch, gather slide bearing lubricating film pressure distribution data, while monitoring pressure curve distribution situation is also done late time data and is handled.
2. the complete all lubricating film pressure wireless monitoring methods of a kind of according to claim 1 liquid sliding bearing; It is characterized in that said wireless launcher comprises preposing signal process circuit constant current source module, digital signal processor DSP 2812, MSP430 single-chip microcomputer, CC1101 radiofrequency emitting module and the supply module to the sensor power supply; Said radio receiver comprises MSP430 single-chip microcomputer, CC1101 Receiver Module and supply module; Data after wireless launcher will be handled through the CC1101 radiofrequency emitting module early stage are seen off, and radio receiver receives data through the CC1101 Receiver Module and sends it to upper computer software via the MSP430 single-chip microcomputer through the RS485/232 interface and does further analysis and handle then.
3. like the complete all lubricating film pressure wireless monitoring methods of the said a kind of liquid sliding bearing of claim 2, it is characterized in that in the said wireless launcher, the constant current source module of built-in low-pass filter circuit is responsible for power supply to pressure transducer being provided; The signal that sensor acquisition arrives is delivered to digital signal processor DSP 2812 through after the pre-process; Digital signal processor DSP 2812 has 8 acquisition channels, and SF and sampled point number average can be provided with simultaneously; Signal will be compressed and encode in DSP2812; Signal distinguishing validity program that DSP2812 is also built-in, in order to the signal that collects is done preliminary screening, the signal that surpasses setting threshold just can be seen off through CC1101 radio frequency sending module via the MSP430 single-chip microcomputer.
4. like the complete all lubricating film pressure wireless monitoring methods of the said a kind of liquid sliding bearing of claim 2; It is characterized in that; In the said radio receiver; The signal of CC1101 Receiver Module after to compression and coding receives, and sends the MSP430 single-chip microcomputer to, delivers to upper computer software through the RS485/232 interface then and decodes and decompress; Extract and analytical algorithm through the built-in signal characteristic of software at last, analyze and be presented on the software interface obtaining the moisture film pressure data.
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| CN2010105725856A CN102095548B (en) | 2010-12-03 | 2010-12-03 | All-around lubricating film pressure wireless monitoring method of liquid sliding bearing |
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| CN2010105725856A CN102095548B (en) | 2010-12-03 | 2010-12-03 | All-around lubricating film pressure wireless monitoring method of liquid sliding bearing |
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| CN102095548B true CN102095548B (en) | 2012-11-28 |
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| CN111322511B (en) * | 2020-02-27 | 2021-08-24 | 南京工程学院 | Method for detecting lubricating performance of oil film in constant linear velocity operation of static pressure rotary table |
| CN111716306B (en) * | 2020-06-30 | 2021-06-11 | 扬州大学 | Bearing-rotor experiment table with automatic centering and locking functions |
| CN114199568A (en) * | 2021-12-15 | 2022-03-18 | 清华大学 | Liquid cavitation observation device for sliding bearing |
| CN114810841B (en) * | 2022-04-02 | 2023-06-27 | 陕西理工大学 | Intelligent water lubrication bearing |
| CN114636493B (en) * | 2022-04-02 | 2023-06-20 | 陕西理工大学 | Embedded sliding bearing lubricating film pressure wireless sensing monitoring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86100353A (en) * | 1985-02-20 | 1986-08-20 | 株式会社日立制作所 | The abnormality of sliding bearing and service limits detector thereof |
| CN2714813Y (en) * | 2004-06-14 | 2005-08-03 | 宁波大发化纤有限公司 | Protective device for monitoring oil pressure of lubricating system and bearing temperature |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86100353A (en) * | 1985-02-20 | 1986-08-20 | 株式会社日立制作所 | The abnormality of sliding bearing and service limits detector thereof |
| CN2714813Y (en) * | 2004-06-14 | 2005-08-03 | 宁波大发化纤有限公司 | Protective device for monitoring oil pressure of lubricating system and bearing temperature |
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| CN102095548A (en) | 2011-06-15 |
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