CN107907665A - Modularization fluid on-line monitoring system - Google Patents

Modularization fluid on-line monitoring system Download PDF

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Publication number
CN107907665A
CN107907665A CN201711297919.1A CN201711297919A CN107907665A CN 107907665 A CN107907665 A CN 107907665A CN 201711297919 A CN201711297919 A CN 201711297919A CN 107907665 A CN107907665 A CN 107907665A
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China
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module
sensor
pollution degree
monitoring system
moisture
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CN201711297919.1A
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杨琨
于强
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Wuhan University of Technology WUT
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Wuhan University of Technology WUT
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Priority to CN201711297919.1A priority Critical patent/CN107907665A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/26Oils; Viscous liquids; Paints; Inks
    • G01N33/28Oils, i.e. hydrocarbon liquids
    • G01N33/2888Lubricating oil characteristics, e.g. deterioration
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00Measuring or testing not otherwise provided for
    • G01D21/02Measuring two or more variables by means not covered by a single other subclass

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Immunology (AREA)
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  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

The present invention relates to modularization fluid on-line monitoring system, its main feature is that modularization, between particle pollution degree sensor, moisture transducer, four-in-one sensor, and is connected between particle pollution degree module and heater module using quick coupling;Three sensors are divided into three independent units, independently of one another, when one of module breaks down, need to only pull up quick coupling, you can individually take out the module to break down, it is not necessary to whole system is dismantled, convenient maintenance.The present invention is realized carries out real time on-line monitoring to the fluid characteristic of mechanical equipment lubricating oil, mechanical equipment Lubricating Oil belt transect to laboratory is subjected to off-line analysis before avoiding, but a monitoring branch pipe directly is bypassed from lubricating oil working connection, realize to mechanical equipment lubricating oil real time on-line monitoring;Maximum feature is modularization, therefore any one module breaks down and can individually take out it, it is not necessary to dismantles other modules and whole system is dismantled, so as to facilitate maintenance.

Description

Modularization fluid on-line monitoring system
Technical field
The invention belongs to mechanical equipment operating condition monitoring technical field, and it is automatic to be related to a kind of mechanical equipment lubricating oil state On-line monitoring technique.
Background technology
Oil monitoring, is the product that modern industry continues to develop.In mechanical equipment, the relative motion for the pair that rubs Fretting wear can be produced, therefore, the fretting wear of parts is most common, most important failure mode.Therefore, it is mechanical to reduce Frictional energy consumption and lost material consumption caused by the secondary relative motion of friction, typically add to moving surface and moisten in equipment Lubricating oil.With the operating of mechanical equipment, the experience such as wear particle, corrosion product, lubricating oil and additive of parts is a series of Physicochemical change and formed colloid, pitch, thermal technology's machine fuel combustion product such as greasy filth etc., this is to a certain extent invariably The normal operation of mechanical equipment, serious damage mechanical equipment are affected, therefore oil monitoring comes into being.Lubricating oil Monitoring technology by the equipment lubrication collected oil or working media sample, using means such as light, electricity, magnetics, analyze its physics and chemistry and refer to The entrained abrasion of mark, detection and contaminant particle, so that the lubrication of machine and the information of state of the abrasive grain are obtained, it is qualitative and quantitative Ground describes the state of wear of equipment, finds out risk factor.Evaluate the operating mode of machine and predict its failure.
Fluid on-line monitoring technique develops on the basis of Oil Monitoring Technique, conventional offline oil liquid monitoring Technology is that the oil sample that will be collected is taken laboratory and analyzed, and has been short of naturally in terms of accuracy without real-time.Oil Liquid on-line monitoring technique is that the physical and chemical index of lubricating oil is monitored in real time by sensor, compared to off-line monitoring method More accurately reflect the state at that time of lubricating oil.
The content of the invention
Problem to be solved by this invention is:There is provided it is a kind of to the water content of used-oil, particle concentration, temperature, The modularization Oil Monitor System that viscosity, density, dielectric constant properties are monitored on-line.
The modularization fluid on-line monitoring system, equipped with particle pollution degree module, moisture module, four-in-one module, Particle pollution degree mould particle pollution degree sensor in the block, moisture mould moisture transducer in the block, four-in-one mould in the block four closes One sensor transfers data to serial server by data cable;Serial server is transferred data to upper by cable Machine, the software of host computer shows the data of each sensor, and the monitoring object of modularization on-line monitoring system is analyzed;If There is heating module, on the first layer rightward space bottom plate of stent, between electric pump and particle pollution degree module.
The particle pollution degree module includes module box body, petroleum pipeline, particle pollution degree sensor;Monitoring system institute is real When the lubricating oil that monitors particulate pollutant module is entered by oil inlet, flow through petroleum pipeline, particle pollution degree sensor, oil transportation Pipe, oil outlet, which are finally discharged, flows into moisture module outside particulate pollutant module.
The moisture module includes module box body, oil inlet, oil outlet, petroleum pipeline, moisture transducer and logical oil pocket;Prison The lubricating oil that examining system monitors in real time enters moisture module by oil inlet, flows through petroleum pipeline and enters logical oil pocket then from oil transportation Pipe, oil outlet, which are finally discharged, flows into four-in-one module outside moisture module;The moisture transducer unlike particle pollution degree module It is placed on to provide sufficient contact area inside logical oil pocket, so that measurement is more accurate.
The four-in-one module includes module box body, oil inlet, oil outlet, petroleum pipeline, four-in-one sensor;Monitoring system The lubricating oil monitored in real time of uniting enters four-in-one module by oil inlet, flows through petroleum pipeline and enters logical oil pocket, then from oil transportation Pipe, oil outlet are finally discharged to be flow back into grease-box outside four-in-one module;Identical with moisture module, four-in-one sensor is placed To provide sufficient contact area inside logical oil pocket, so that measurement is more accurate.
The data acquisition module includes a serial server, and particle pollution degree module, moisture module, four conjunctions One module, corresponding particle pollution degree sensor, moisture transducer, data cable passes through caused by four-in-one sensor RS232 ports are connected on serial server, and serial server is by the data collected by network cable transmission to host computer.
The electric pump uses magnetic gear pump, and power is provided for the circulation of system oil;System power supply is all moulds Block and magnetic gear pump offer electric energy.
The heating module mainly uses PTC constent temperature heaters, the lubricating oil of the system of inflow is heated, to meet to sense The condition of device normal work.
The present invention has following main beneficial effect compared with prior art:
(1) realize and real time on-line monitoring is carried out to the fluid characteristic of mechanical equipment lubricating oil.By machinery before avoiding Equipment lubrication oil oil sample takes laboratory to and carries out off-line analysis, but directly bypasses a monitoring branch pipe from lubricating oil working connection, Realize to mechanical equipment lubricating oil real time on-line monitoring.
(2) except particle pollution degree sensor, other sensors realize mechanical equipment lubricating oil fluid by logical oil pocket The real-time online measuring of physico-chemical property, logical oil pocket can increase the contact area of sensor and fluid, when sensor can with fluid Good contact, so as to reduce measurement error to a certain extent.
(3) maximum feature is modularization, therefore any one module breaks down and can individually take out it, it is not necessary to Dismantle other modules, it is not required that whole system is dismantled, so as to greatly facilitate dimension of the staff for the equipment Repair.
Brief description of the drawings
Fig. 1 is a kind of modularization fluid on-line monitoring system mechanical part outside drawing of the present invention;
Fig. 2 is a kind of modularization fluid on-line monitoring system operation principle schematic diagram of the present invention;
Fig. 3 is a kind of modularization fluid on-line monitoring system lubrication oil circulation path schematic diagram of the present invention;
Fig. 4 is a kind of modularization fluid on-line monitoring system particle pollution degree modular structure schematic diagram of the present invention;
Fig. 5 is a kind of modularization fluid on-line monitoring system moisture modular structure schematic diagram of the present invention;
Fig. 6 is a kind of modularization fluid on-line monitoring system four-in-one modular structure schematic diagram of the present invention.
In figure:1. particle pollution degree module, 2. moisture modules, 3. four-in-one modules, 4. electric pumps, 5. heater modules, 6. Power supply, 7. serial servers, 8. host computers, 9. Aviation Connectors, 10. first quick coupling sockets, 11. second quick couplings are inserted Mouthful, 12. particle pollution degree sensors, 13. moisture transducers, 14. moisture modules lead to oil pocket, 15. four-in-one sensors, and 16. 4 Unification module leads to oil pocket.
Embodiment
The invention discloses a kind of modularization fluid on-line monitoring system, including particle pollution degree module, moisture module, four Unify module, heating module, data acquisition module etc., connected, be convenient for changing using hydraulic joint between module.Particle pollution degree Module obtains the data that particle pollution degree sensor is gathered, and moisture module obtains the data that moisture transducer is gathered, and four close One module obtains the data that four-in-one sensor is gathered, and heating module heating lubricating oil, improves lubricating oil temperature, reduce lubrication Oil viscosity.Data acquisition module arrives the Data Integration of particle pollution degree sensor, moisture transducer, four-in-one sensor collection Data are transmitted to by host computer by cable together.The mentality of designing of modularization fluid on-line monitoring system is by the monitoring system The water content of mechanical equipment lubricating oil, particle pollution degree concentration, temperature, viscosity, dielectric constant, close can be monitored on-line in real time The parameters such as degree, to judge that mechanical equipment fault and prediction data variation tendency provide foundation.
Since mechanical equipment lubricating oil pipeline is thicker, and the lubricating oil of mechanical equipment is more demanding to cleannes etc., because This cannot arbitrarily change original pipeline, and solution is to use bypass line, and selecting one at fuel reserve tank takes hydraulic fluid port, passes through Lubricating oil is incorporated into Oil Monitor System by copper pipe, is transmitted back to fluid by fluid on-line monitoring system, then by copper pipe Fuel reserve tank, thus monitors the lubricating oil of mechanical equipment on-line.
The invention will be further described below in conjunction with the accompanying drawings, but does not limit the present invention.
Modularization fluid on-line monitoring system provided by the invention, its structure is as shown in Figure 1, including particle pollution degree module 1st, moisture module 2, four-in-one module 3, electric pump 4, heating module 5, power supply 6, serial server 7, host computer 8 and data acquisition module Block (serial server), wherein:Particle pollution degree module 1, moisture module 2, four-in-one module 3 are by data cable by data transfer To serial server 7, serial server 7 transfers data to host computer 8 by cable;Serial server 7 is by above three's Data Integration to signal is transmitted to host computer by cable together, analyze data by software by host computer.
The particle pollution degree module 1 is on the first layer leftward space bottom plate of stent, for collecting particle pollution degree The data of sensor 12.The particle pollution degree module is dirty by module housing, the first quick coupling socket 10, copper pipeline, particle Dye degree sensor 12, the second quick coupling socket (11) are formed, wherein:Particle pollution degree sensor 12 is using ARGO companies OPCom II type sensors, 12 and first quick coupling socket 10 of particle pollution degree sensor, copper pipeline, the second quick coupling Socket 11 is fixed on by hold-down support on the shell bottom plate of particle pollution degree module 1, and fluid is from 1 shell of particle pollution degree module First quick coupling socket 10 of rear end flows into, and flows through particle pollution degree sensor 12, finally before particle pollution degree degree module 1 The second quick coupling socket 11 at end flows out.The signal of particle pollution degree sensor 12 passes through data line transfer to serial server On 7.
The moisture module 2 is on the second layer leftward space bottom plate of stent, for collecting the number of moisture transducer 13 According to.The moisture module is led to by module housing, the first quick coupling socket 10, copper pipeline, moisture transducer 13 and moisture module Oil pocket 14, the second quick coupling socket 11 are formed, wherein:Moisture transducer uses the LubCos H2Oplus II of ARGO companies Type sensor, 13 and first quick coupling socket 10 of moisture transducer, the second quick coupling socket 11 are fixed by hold-down support On the shell bottom plate of moisture module 2, the first quick coupling socket 10 of fluid from 2 shell lower end of moisture module flows into, and flows through Moisture module leads to oil pocket 14, and finally the second quick coupling socket 11 from 2 shell upper end of moisture module flows out.Moisture transducer 13 It is inserted into four-in-one module to lead in oil pocket 16, the signal exported passes through on data line transfer to serial server 7.
The four-in-one module 3 is on the third layer leftward space bottom plate of stent, for collecting four-in-one sensor 15 Data, the four-in-one module by module housing, the first quick coupling socket 10, copper pipeline, four-in-one sensor 15, four close One module is led to oil pocket 16, the second quick coupling plug 11 and hold-down support and is formed.Wherein:Four-in-one sensor uses FPS2800B12C4 type fluid behaviour sensors, four-in-one sensor 15, the first quick coupling socket 10, the second quick coupling socket It is fixed on by hold-down support on the shell bottom plate of four-in-one module 3, fluid is quick from the first of 3 shell lower end of four-in-one module Connector socket 10 flows into, and flows through four-in-one module and leads to oil pocket 16, finally from the second quick coupling of 3 shell upper end of four-in-one module Socket 11 flows out.Four-in-one sensor 15 is inserted into four-in-one module and leads in oil pocket 16, and the signal exported is passed by data cable It is defeated on serial server 7.
Electric pump 4 provides power for lubricating oil in whole system flowing.
Heating module 5 is installed on the first layer rightward space bottom plate of stent, positioned at electric pump 4 and particle pollution degree module 1 Between, lubricating oil is heated to satisfactory temperature.The heating module 5 uses PTC constent temperature heaters.
Power supply 6 is particle pollution degree sensor, moisture transducer, four-in-one sensor, electric pump, serial server electricity consumption are set Available electricity.
Modularization fluid on-line monitoring system provided by the invention, its course of work are as follows:
Lubricating oil enters system from inflow pipeline from electric pump 4, respectively flow through heater module 5, particle pollution degree module 1, Moisture module 2 and four-in-one module 3, mechanical equipment grease-box is flowed back to finally by oil returning tube.Wherein electric pump is act as Lubricating oil provides circulation power, it is contemplated that bad border factor influences, and when the temperature of the surroundings is low, heater module adds lubricating oil Heat, make lubricating oil temperature reach coincidence senser normal work require in the range of.
Fig. 2 is a kind of operation principle schematic diagram of modularization fluid on-line monitoring system of the present invention.Power supply 6 is whole system All electrical appliances include particle pollution degree sensor 12, moisture transducer 13, four-in-one sensor 15, heating module 5, electric pump 4th, serial server 7 is powered, and the data that particle pollution degree sensor 12, moisture transducer 13, four-in-one sensor 15 gather are led to Cross data cable and be transmitted to serial server 7, data are transmitted to host computer 8 by serial server by cable again.
Fig. 3 is a kind of lubrication oil circulation path schematic diagram of modularization fluid on-line monitoring system of the present invention.From lubricating oil One of case takes hydraulic fluid port to take oil, and lubricating oil flows into electric pump 4 by copper pipe, and heating module 5 is flowed into from electric pump outflow by copper pipe, from Heating module outflow is flowed into particle pollution degree module 1 by the hose with quick coupling, is flowed out from particle pollution degree module Moisture module 2 is flowed into by the hose with quick coupling, from the outflow of moisture module by the hose stream with quick coupling Enter to four-in-one module 3, finally flowed out from four-in-one module and flow back into grease-box by copper pipe, wherein on grease-box Take hydraulic fluid port and oil return opening distance remote, prevent the flow field of lubricating oil flow generation is mutually relevant from influencing the accurate of data so as to disturb Property.
Fig. 4 is a kind of particle pollution degree modular structure schematic diagram of modularization fluid on-line monitoring system of the present invention.By moistening Lubricating oil needs directly to be flowed into particle pollution degree sensing from the first quick coupling socket 10 by particle pollution degree sensor, fluid Device 12 flows out to the second quick coupling socket 11 again, and top is second quick for the lower section of the first quick coupling socket 10 as shown in the figure Connector socket 11;Data cable is connected in Aviation Connector 9.
Fig. 5 is a kind of moisture modular structure schematic diagram of modularization fluid on-line monitoring system of the present invention.Since moisture passes The probe diameter of sensor 13 is much larger than copper pipe diameter, it is therefore desirable to sets logical oil pocket;The purpose for setting logical oil pocket is to moisture Sensor probe provides certain space, it is come into full contact with lubricating oil.Unlike particle pollution degree module, profit Lubricating oil liquid need not run through moisture transducer, and lubricating oil by the first quick coupling socket 10 is flowed into moisture module and leads to oil pocket 14 to flow again To the second quick coupling socket 11;Left side is that oil inlet right side is oil outlet (i.e. bottom in and top out) as shown in Figure 5;Data cable connects Onto Aviation Connector 9.
Fig. 6 is a kind of four-in-one modular structure schematic diagram of modularization fluid on-line monitoring system of the present invention.Similarly in water Sub-sensor module is much larger than copper pipe diameter due to the probe diameter of four-in-one sensor 15, it is therefore desirable to sets logical oil pocket;If The purpose for putting logical oil pocket is the space certain to the offer of four-in-one sensor probe, it is come into full contact with lubricating oil. Lubricating oil, which by the first quick coupling socket 10 is flowed into four-in-one module and leads to oil pocket 16, then flows into the second quick coupling socket 11;Such as The left side shown in figure is that the oil inlet right side is oil outlet (i.e. bottom in and top out);Data cable is connected in Aviation Connector 9.

Claims (8)

  1. A kind of 1. modularization fluid on-line monitoring system, it is characterised in that the characteristics of fluid on-line monitoring system is modularization, Between particle pollution degree sensor, moisture transducer, four-in-one sensor, and particle pollution degree module and heater module it Between using quick coupling connect;Three sensors be divided into three independent units, independently of one another, when one of module occur therefore Barrier, need to only pull up quick coupling, you can and the module that will appear from failure is individually taken out, and is not required to dismantle whole system, from And conveniently repair, save the time.
  2. 2. modularization fluid on-line monitoring system according to claim 1, it is characterized in that being equipped with particle pollution degree module (1), moisture module (2), four-in-one module (3), particle pollution degree sensor (12), moisture in particle pollution degree module (1) The four-in-one sensor (15) in moisture transducer (13), four-in-one module (3) in module (2) is passed data by data cable It is defeated to arrive serial server (7);Serial server (7) transfers data to host computer (8), the software of host computer (8) by cable Show the data of each sensor, and the monitoring object of modularization on-line monitoring system is analyzed;Equipped with heating module (5), On the first layer rightward space bottom plate of stent, between electric pump (4) and particle pollution degree module (1).
  3. 3. modularization fluid on-line monitoring system according to claim 2, it is characterised in that particle pollution degree module (1) is wrapped Include module box body, petroleum pipeline, particle pollution degree sensor (12);The lubricating oil that monitoring system monitors in real time by oil inlet into Enter particulate pollutant module, flow through petroleum pipeline, particle pollution degree sensor (12), petroleum pipeline, oil outlet and finally discharge particle dirt Contaminate and moisture module is flowed into outside thing module.
  4. 4. modularization fluid on-line monitoring system according to claim 2, it is characterised in that moisture module (2) includes module Box body, oil inlet, oil outlet, petroleum pipeline, moisture transducer (13) and logical oil pocket;The lubricating oil that monitoring system monitors in real time leads to Cross oil inlet and enter moisture module, flow through petroleum pipeline and enter logical oil pocket and then finally discharge moisture module from petroleum pipeline, oil outlet Outer inflow four-in-one module;The moisture transducer (13) unlike particle pollution degree module (1) be placed on inside logical oil pocket with Sufficient contact area is provided, so that measurement is more accurate.
  5. 5. modularization fluid on-line monitoring system according to claim 2, it is characterised in that four-in-one module (3) includes mould Block box body, oil inlet, oil outlet, petroleum pipeline, four-in-one sensor (15);The lubricating oil that monitoring system monitors in real time by into Hydraulic fluid port enters four-in-one module, flows through petroleum pipeline and enters logical oil pocket, then finally discharges four-in-one module from petroleum pipeline, oil outlet It flow back into outside in grease-box;Identical with moisture module (2), four-in-one sensor (15) is placed on inside logical oil pocket to be filled with providing The contact area of foot, so that measurement is more accurate.
  6. 6. modularization fluid on-line monitoring system according to claim 2, it is characterised in that data acquisition module includes one A serial server (7), and particle pollution degree module (1), moisture module (2), four-in-one module (3), corresponding particle Dustiness sensor (12), moisture transducer (13), data cable is connect by RS232 ports caused by four-in-one sensor (15) Onto serial server (7), serial server (7) gives the data collected to host computer (8) by network cable transmission.
  7. 7. modularization fluid on-line monitoring system according to claim 2, it is characterised in that electric pump (4) uses magnetic-gear Pump, power is provided for the circulation of system oil;System power supply provides for all modules and magnetic gear pump and uses electric energy.
  8. 8. modularization fluid on-line monitoring system according to claim 2, it is characterised in that heating module (5) mainly uses PTC constent temperature heaters, the lubricating oil of the system of inflow are heated, to meet the condition of normal operation of sensor.
CN201711297919.1A 2017-12-08 2017-12-08 Modularization fluid on-line monitoring system Pending CN107907665A (en)

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Cited By (9)

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CN110131464A (en) * 2019-05-08 2019-08-16 福建洁博利厨卫科技有限公司 A kind of inductive tap discharging device
CN110261263A (en) * 2019-04-08 2019-09-20 武汉理工大学 Lubricating oil de-soak and on-Line Monitor Device
CN110873788A (en) * 2018-08-30 2020-03-10 中国石油天然气股份有限公司 Equipment friction and lubrication on-line monitoring system based on multiple monitoring information
CN111389055A (en) * 2020-04-03 2020-07-10 武汉理工大学 Fire fighting equipment for oil on-line monitoring system
CN111579431A (en) * 2020-06-03 2020-08-25 中合润邦科技(北京)有限公司 Method for on-line monitoring of lubricating oil
CN111912644A (en) * 2020-08-21 2020-11-10 陕西新汇华数字科技有限公司 5G-based cement plant production line comprehensive online state monitoring system and monitoring method
CN112526111A (en) * 2020-12-04 2021-03-19 南京晨昊工业科技有限公司 Oil quality online monitoring method and system
CN113884140A (en) * 2021-10-29 2022-01-04 深圳市亚泰光电技术有限公司 Oil liquid monitor
CN114755396A (en) * 2022-03-30 2022-07-15 四川恒诚达科技有限公司 Oil on-line monitoring system

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Publication number Priority date Publication date Assignee Title
CN110873788A (en) * 2018-08-30 2020-03-10 中国石油天然气股份有限公司 Equipment friction and lubrication on-line monitoring system based on multiple monitoring information
CN110261263A (en) * 2019-04-08 2019-09-20 武汉理工大学 Lubricating oil de-soak and on-Line Monitor Device
CN110131464A (en) * 2019-05-08 2019-08-16 福建洁博利厨卫科技有限公司 A kind of inductive tap discharging device
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CN111579431A (en) * 2020-06-03 2020-08-25 中合润邦科技(北京)有限公司 Method for on-line monitoring of lubricating oil
CN111912644A (en) * 2020-08-21 2020-11-10 陕西新汇华数字科技有限公司 5G-based cement plant production line comprehensive online state monitoring system and monitoring method
CN112526111A (en) * 2020-12-04 2021-03-19 南京晨昊工业科技有限公司 Oil quality online monitoring method and system
CN113884140A (en) * 2021-10-29 2022-01-04 深圳市亚泰光电技术有限公司 Oil liquid monitor
CN114755396A (en) * 2022-03-30 2022-07-15 四川恒诚达科技有限公司 Oil on-line monitoring system
CN114755396B (en) * 2022-03-30 2024-03-15 四川恒诚达科技有限公司 Online oil monitoring system

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