CN104209346B - A kind of mill lubrication online oil monitoring device without the need to temperature compensation and monitoring method thereof - Google Patents
A kind of mill lubrication online oil monitoring device without the need to temperature compensation and monitoring method thereof Download PDFInfo
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- CN104209346B CN104209346B CN201410455530.5A CN201410455530A CN104209346B CN 104209346 B CN104209346 B CN 104209346B CN 201410455530 A CN201410455530 A CN 201410455530A CN 104209346 B CN104209346 B CN 104209346B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
Abstract
The invention discloses a kind of mill lubrication online oil monitoring device without the need to temperature compensation and monitoring method thereof, belong to monitoring industrial equipment instrument field.In the present invention, each lubrication monitoring modular is for monitoring a mill lubrication branch road or a fuel tank, lubrication monitoring modular comprises capacitive transducer probe electrode, capacitive transducer signal processing circuit and gathers control transmission circuit, capacitive transducer probe electrode comprises external electrode, target and interior electrode, external electrode and target form parallel planar capacitor, and target and interior electrode form parallel planar capacitor.In monitoring method of the present invention, the difference of water percentage and dustiness is distinguished according to recording the time dependent slope of tested fluid specific inductive capacity numerical value under real time temperature.The present invention compensates without the need to temperature and other, just can the quality index such as the overall population pollution level of the tested fluid of on-line monitoring and water percentage, has a wide range of applications in mechanical equipment state monitoring and fault diagnosis.
Description
Technical field
The invention belongs to monitoring industrial equipment instrument field, particularly a kind of mill lubrication online oil monitoring device without the need to temperature compensation and monitoring method thereof, realize mill lubrication oil water percentage and oil contamination status monitoring.
Background technology
Steel mill all also exists a large amount of hydraulic systems, and the pollution technology of on-line monitoring fluid is research equipment wearing situation, carries out the important means of equipment condition monitoring and fault diagnosis.The normally pollution that causes of metal worn particle, oxide, greasy filth, knot carbon, moisture, sediment, fuel oil and hydrogen, chlorine, heat, electricity, air etc. of the pollution form of fluid.After oil contamination, its physics or chemical property all can change, according at identical temperature with trade mark fresh oil with in the change of the specific inductive capacity with oil, just can synthesis measuring with the gross contamination degree of oil and quality, i.e. contamination level of oil liquid.
Because a large amount of water under high pressure of high-speed wire production line cools, chilled water inevitably enters finishing mill lubricating system.This just requires, when finding that chilled water enters, to take measures in time, reduces the possibility that Emulsion is formed.The change that Maanshan Magang Huayang Equipment Diagnostics Engineering Co., Ltd. is produced by lubricants performance after intaking in a large number from wire rod fast mill lubricating system, lubricating oil cause the analysis of bearing failure reason to draw to draw a conclusion: the probability that the Oil Film of Bearing Oil used for wire rod fast mill will make bearing produce inefficacy when water cut is more than 0.5% increases, if very likely produce bearing failure in a short time when water cut is more than 1%.This monitors the lubrication of every platform milling train and fuel tank with regard to needing, and Timeliness coverage is that milling train leaks and whether main fuel tank water percentage transfinites, so that on-call maintenance or change reserve fuel tank and open fuel tank dehydration plant.
At present conventional is all the monitoring device of independent on-line monitoring lubricating oil water content or comprehensive pollution degree, and it is all mainly utilize the change of oily specific inductive capacity to measure.The instrument great majority that the change based on oily specific inductive capacity conventional at present measures lubricating oil quality adopt off-line sampling monitoring.If lubricating oil fast mass detector is exactly utilize with trade mark fresh oil and the change at the specific inductive capacity with oil, measure quality of lubrication oil, this offline mode is analyzed because needs first sample again, not only require great effort time-consuming, cost is high, and returning of measurement result has hysteresis quality, in many applications gradually substitute by on-line real time monitoring technology, and on-line monitoring more becomes the cutting edge technology of oil analysis in mechanical fault diagnosis.
Change based on oily specific inductive capacity measures the on-line monitoring instrument of lubricating oil quality and sensor is also have report more and carry out application.Specific inductive capacity due to fluid in application changes along with temperature variation.And on-line monitoring is specific inductive capacity under real time temperature, and the value of the same trade mark fresh oil contrasted or normal fluid is demarcated at a certain temperature, if the variable quantity of both contrasts, will calculate same trade mark fresh oil or the numerical value of normal fluid under real time temperature.Conventional method is that additional temperature sensor measures real time temperature and experimentally formula or given formulae discovery, with trade mark fresh oil or the normal fluid offset when real time temperature, namely carry out temperature compensation to measurement result.Temperature sensor due to industrial use has larger error, and as PT100 error reaches 0.5, the temperature compensation value after calculating so also will produce corresponding error.Moreover the factor of fluid change in dielectric constant of getting on very well is very complicated, is also to cause certain error according to fixing compensation formula.On-line monitoring operating mode and environment also have a certain impact for metering circuit and the tested specific inductive capacity of fluid simultaneously, in fact the fluid capacitance variations itself recorded based on this technology of dielectric constant measurement is also small, the error of temperature compensation and the impact of environment industrial and mineral are very large on measurement result impact, sometimes even can change the result of measurement.This has just become the large obstacle of current obstruction on-line monitoring technique application.
Summary of the invention
1. invent the technical matters that will solve
The object of this invention is to provide a kind of mill lubrication online oil monitoring device without the need to temperature compensation and monitoring method thereof, adopt on-Line Monitor Device of the present invention, can according to same trade mark fresh oil (namely contrasting fluid) and the change at the real-time specific inductive capacity with oil (i.e. tested fluid), compensate without the need to temperature and other, just can on-line monitoring by quality index such as the overall population pollution level of oil and water percentage, have a wide range of applications in mechanical equipment state monitoring and fault diagnosis.
2. technical scheme
For achieving the above object, technical scheme provided by the invention is:
A kind of mill lubrication online oil monitoring device without the need to temperature compensation of the present invention, comprise N number of lubrication monitoring modular, wherein N<30 and be positive integer, each lubrication monitoring modular is for monitoring a mill lubrication branch road or a fuel tank, wherein: lubrication monitoring modular comprises capacitive transducer probe electrode, capacitive transducer signal processing circuit and collection control transmission circuit, described capacitive transducer probe electrode is installed on mill lubrication branch road or fuel tank and immerses tested fluid, this capacitive transducer probe electrode is connected with capacitive transducer treatment circuit, the output signal of capacitive transducer treatment circuit is transferred to microprocessor by collection control transmission circuit and data show and memory storage, wherein: described capacitive transducer probe electrode comprises external electrode, target and interior electrode, described dispatch from foreign news agency very plate-like structure, described target is the cuboid structure that front end is closed, described interior electrode is slab construction, this external electrode is arranged on the side of target, the open cavity flow through for tested fluid is formed between described external electrode and target, the inside of described target is the enclosed cavity placed for contrast fluid, interior electrode is arranged on the centre position of target enclose inside cavity, and external electrode, the sidewall of target and interior electrode parallels, external electrode and target form parallel planar capacitor, target and interior electrode form parallel planar capacitor.
Furthermore, described target is provided with the oil hole communicated with enclosed cavity and seal plug, this oil hole and the contrast fluid of seal plug for filling, changing and in hermetically enclosed cavity.
Current high-speed wire mill lubricating system is concentrated oil lubricating system, and pair fuel tank that adopts configures more, by Lubricating pump station fuel feeding, flows through shared scavenge pipe to fuel tank after flowing through filmatic bearing of press respectively by the frame scavenge pipe of milling train.This monitors the lubrication of every platform milling train and fuel tank with regard to needing, and Timeliness coverage is that milling train leaks and whether main fuel tank water percentage transfinites, so that on-call maintenance or change reserve fuel tank and open fuel tank dehydration plant.The present invention designs: the scheme of single-point acquiring/unicast/host computer centralized displaying and control, can realize like this monitoring every platform milling train or single fuel tank, there is at single monitoring means the alarm that leaks, single lubrication monitoring modular controls transmission circuit RS485 communication transfer to host computer and microprocessor and data display and memory storage by the collection of its inside, can realize that multiple spot dispersion is monitored, long-range, central controlled function.Because industrial computer holds the concrete situation in quantitative limitation and workshop, the lubrication monitoring point that general each workshop needs can not more than 30, but are also not limited to and are less than 30 monitoring points.
In the present invention, the basic functional principle of capacitive transducer probe electrode is this feature that can be converted into electric capacitance change based on the change of tested dielectric Constant.The change of fluid dielectric Constant can not directly be measured, and therefore will set up the mapping relations between the change of capacitance and specific inductive capacity.When other condition is identical, fluid is allowed to flow through a capacitive transducer, the capacitance formed during intermediate medium as capacitor of the fluid of different quality is inevitable different, and its physics or chemical property all can change after oil contamination, according at identical temperature with trade mark fresh oil (namely contrasting fluid) with the oil specific inductive capacity of (i.e. tested fluid) and the change of electric capacity, just can synthesis measuring by the gross contamination degree of oil and quality.Because the specific inductive capacity of water is comparatively larger than difference with oil phase, when being mixed into water in lubricating oil, the water of trace will cause the obvious change of mixed oil liquid specific inductive capacity.The lubricating oil mixed liquor of different water cut and the specific inductive capacity of straight lubrication oil are compared, then by circuit signal process, just can obtain water content of lubricating oil rate score.
Change based on tested fluid specific inductive capacity can be converted into this feature of sensor capacitance change.Therefore according to sensor set up capacitance and specific inductive capacity between mapping relations.Obtain by capacitive transducer treatment circuit the electrical parameter values that sensor exports and react the change of fluid specific inductive capacity.This electrical quantity can be voltage, electric current or other electrical quantity units.Conventional capacitive transducer treatment circuit is generally C/V conversion processing circuit, obtains the magnitude of voltage of sensor output to react the change of fluid specific inductive capacity.The present invention proposes signal that capacitive transducer treatment circuit comprises all electric capacitance change caused using the change of tested fluid specific inductive capacity exports electrical quantity signal after treatment circuit as sensor, is not limited to electric capacity/voltage (C/V) change-over circuit.
A kind of oil of the mill lubrication without the need to temperature compensation on-line monitoring method of the present invention, the difference of water percentage and dustiness is distinguished according to recording the time dependent slope of tested fluid specific inductive capacity numerical value under real time temperature, and its step is as follows:
1) the mill lubrication online oil monitoring device without the need to temperature compensation, is adopted, utilize capacitive transducer signal processing circuit to record the specific inductive capacity under the real time temperature of tested fluid and contrast fluid in real time by capacitive transducer probe electrode, the electrical quantity signal that capacitive transducer treatment circuit correspondence exports controls transmission circuit and is transferred to microprocessor and data by gathering and shows and memory storage;
2), microprocessor and data display and memory storage calculate the specific inductive capacity of the tested fluid measured in real time under real time temperature relative to contrast fluid change in dielectric constant value, i.e. the corresponding electrical quantity changing value exported;
3), according to step 1) and step 2) data that record, according to the sensor water percentage sensitivity coefficient demarcated in advance, according to sampling interval, increase progressively successively and calculate water percentage corresponding to two consecutive sampling times respectively, and calculate the change slope of water percentage relative to the stipulated time;
4), according to step 3) the change slope that calculates, judge as follows;
4.1), the calculating water percentage that causes of change in dielectric constant for the change slope of stipulated time along with the increase of sampling time number of times, slope has significantly to be increased continuously or slope abrupt change occurs, can be judged as fluid water-cut variation, there is water leakage fault in equipment;
4.2), the calculating water percentage that causes of change in dielectric constant for the change slope of stipulated time along with the increase of sampling time number of times, slope does not significantly increase continuously, can be judged as the dustiness degree of fluid.
3. beneficial effect
Adopt technical scheme provided by the invention, compared with prior art, there is following remarkable result:
(1) a kind of mill lubrication online oil monitoring device without the need to temperature compensation of the present invention, its capacitive transducer probe electrode immerses tested fluid, specific inductive capacity under the tested fluid that sensor treatment circuit is recorded by capacitive transducer probe electrode and contrast fluid real time temperature controls transmission circuit be transferred to microprocessor and data show and memory storage by gathering, therefore, the difference of mill lubrication oil water percentage and dustiness can be distinguished according to the time dependent slope of tested fluid specific inductive capacity numerical value recorded under real time temperature.
(2) a kind of mill lubrication online oil monitoring device without the need to temperature compensation of the present invention, the open cavity flow through for tested fluid is formed between its external electrode and target, the inside of target is the enclosed cavity placed for contrast fluid, external electrode and target form parallel planar capacitor, target and interior electrode form parallel planar capacitor, make the present invention according to contrast fluid and the tested fluid real-time change in dielectric constant when identical temperature, compensate without the need to temperature and other, just can the quality index such as overall population pollution level and water percentage of the tested fluid of on-line monitoring, have a wide range of applications in mechanical equipment state monitoring and fault diagnosis.
Accompanying drawing explanation
Fig. 1 is the composition frame chart of a kind of mill lubrication online oil monitoring device without the need to temperature compensation of the present invention;
Fig. 2 is the schematic diagram of capacitive transducer probe electrode in the present invention;
Fig. 3 is the lateral cross section structural representation of capacitive transducer probe electrode in the present invention.
Label declaration in schematic diagram:
1-N (N<30) lubricates monitoring modular; 30, capacitive transducer probe electrode; 31, capacitive transducer treatment circuit; 32, control transmission circuit is gathered; 33, external electrode; 34, target; 35, interior electrode; 36, open cavity; 37, enclosed cavity; 38, oil hole and seal plug; 40, microprocessor and data show and memory storage.
Embodiment
For understanding content of the present invention further, the present invention is described in detail in conjunction with the accompanying drawings and embodiments, but do not limit the present invention.
Embodiment 1
Composition graphs 1, the present embodiment has multiple spot dispersion remote monitoring and central controlled example, and there is multiple lubrication unit needing monitoring in an inner subsidiary factory of steel mill, for milling train workshop, because job requirement must be monitored each milling train and fuel tank.A kind of mill lubrication online oil monitoring device without the need to temperature compensation of the present embodiment, comprises a fuel tank and mill lubrication pipeline one has 12 lubrication monitoring points.With regard to the present embodiment N=12, label 1 in Fig. 1, 2, 3, 4, N all refers to lubrication monitoring modular, therefore 12 are just had to lubricate monitoring module monitors mill lubrication branch road and fuel tank, wherein: the monitoring modular of each lubrication monitoring point comprises capacitive transducer probe electrode 30, capacitive transducer treatment circuit 31 and collection control transmission circuit 32, described capacitive transducer probe electrode 30 to be installed in mill lubrication branch road or fuel tank and to immerse tested fluid, this capacitive transducer probe electrode 30 is connected with capacitive transducer treatment circuit 31, capacitive transducer treatment circuit 31 is transferred to microprocessor and data display and memory storage 40 by the tested fluid specific inductive capacity that capacitive transducer probe electrode 30 records by collection control transmission circuit 32 and calculates, display and storage.Can realize every platform milling train like this or fuel tank is monitored, centralized displaying, Long-distance Control, to occur in single lubrication monitoring point leaking or fuel tank water percentage transfinites alarm.
As shown in Figures 2 and 3, capacitive transducer probe electrode 30 in the present embodiment comprises external electrode 33, target 34 and interior electrode 35, described external electrode 33 is plate-like structure, the cuboid structure that described target 34 is closed for front end, described interior electrode 35 is slab construction, this external electrode 33 is arranged on the side of target 34, the open cavity 36 flow through for tested fluid is formed between described external electrode 33 and target 34, the inside of described target 34 is the enclosed cavity 37 placed for contrast fluid, interior electrode 35 is arranged on the centre position of target 34 enclose inside cavity 37, and external electrode 33, the sidewall of target 34 and interior electrode 35 parallels, external electrode 33 and target 34 form parallel planar capacitor, target 34 and interior electrode 35 form parallel planar capacitor.Target 34 in the present embodiment is provided with the oil hole communicated with enclosed cavity 37 and seal plug 38, this oil hole and the contrast fluid (namely with trade mark fresh oil or Comparison of standards liquid) of seal plug 38 for filling, changing and in hermetically enclosed cavity 37.
Utilize dielectric constant measurement water content of lubricating oil, mainly utilize the specific inductive capacity of pure water about about 80, the specific inductive capacity of general pure oil is about 2, both differences are very large, therefore after being mixed into water in oil, the specific inductive capacity of oil can be made to have a greater change, and the specific inductive capacity of the oil particularly caused because equipment leaks can sharply increase at short notice fast.
Utilize dielectric constant measurement lubricant pollution degree, mainly utilize fluid in greasing, the pollution that the metal worn particle of wearing and tearing, oxide, greasy filth, knot carbon, sediment, fuel oil and hydrogen, chlorine, heat, electricity, air etc. cause.After oil contamination, specific inductive capacity can change, just can synthesis measuring with the gross contamination degree of oil and quality and contamination level of oil liquid.Leaking with equipment, the change increased unlike, this specific inductive capacity of the specific inductive capacity that causes slowly changes along with the lubrication degradation failure of fluid, and variable quantity is less.
The present invention proposes signal that capacitive transducer treatment circuit comprises all electric capacitance change caused using the change of tested fluid specific inductive capacity exports electrical quantity signal after treatment circuit as sensor, is not limited to electric capacity/voltage (C/V) change-over circuit.Because be universal circuit, just do not add here and detail.
A kind of oil of the mill lubrication without the need to temperature compensation on-line monitoring method of the present embodiment, the difference of water percentage and dustiness is distinguished according to recording the time dependent slope of tested fluid specific inductive capacity numerical value under real time temperature, for conventional capacitive transducer electric capacity/voltage (C/V) conversion processing circuit, its step is as follows:
1) the mill lubrication online oil monitoring device without the need to temperature compensation of the present embodiment, is adopted, utilize capacitive transducer signal processing circuit 31 by capacitive transducer probe electrode 30 record in real time tested fluid and contrast fluid real time temperature under specific inductive capacity, capacitive transducer treatment circuit 31 correspondence export voltage signal by gather control transmission circuit 32 be transferred to microprocessor and data display and memory storage 40;
2), microprocessor and data display and memory storage 40 calculate the specific inductive capacity of the tested fluid measured in real time under real time temperature relative to contrast fluid change in dielectric constant value, i.e. the corresponding voltage change exported;
3), according to step 1) and step 2) data that record, according to the sensor water percentage sensitivity coefficient demarcated in advance, according to sampling interval, increase progressively successively and calculate water percentage corresponding to two consecutive sampling times respectively, and calculate the change slope of water percentage relative to the stipulated time;
About the demarcation of water percentage, for conventional capacitive transducer electric capacity/voltage (C/V) conversion processing circuit, the value of the specific inductive capacity of the corresponding tested fluid of the magnitude of voltage that sensor exports.Therefore the change of sensor output voltage change of fluid specific inductive capacity with regard to illness that has not attacked the vital organs of the human body.
When temperature T, in the water percentage monitoring of lubricating oil, (water percentage 0-5%) adopts piecewise linear analytical approach, and the output voltage of capacitive transducer and the relation of lubricating oil water content meet following linear relationship equation.
V
t＝V
ot+Kh
Then:
Wherein: Δ V=V
t-V
ot;
V
t-when temperature T, the output voltage of sensor in tested fluid (unit V);
V
ot-when temperature T, the output voltage (unit V) of sensor in contrast fluid;
Δ V-corresponding to tested fluid and the sensor output voltage changing value contrasting fluid change in dielectric constant;
The water percentage of h-tested fluid, %;
K-sensor water percentage sensitivity coefficient.
Measure sensor when temperature T according to above calibration equation, the reading of sensor in the oil sample of identical trade mark different water cut can obtain sensor water percentage sensitivity coefficient K according to above equation.According to sensor water percentage sensitivity coefficient, and the specific inductive capacity of the tested fluid measured in real time under foundation real time temperature is relative to contrast fluid change in dielectric constant value (voltage change of corresponding output), can calculate corresponding water percentage.
4), according to step 3) the change slope that calculates, judge as follows;
4.1), the calculating water percentage that causes of change in dielectric constant for the change slope of stipulated time along with the increase of sampling time number of times, in short time, slope has significantly increases continuously or slope abrupt change occurs, can be judged as fluid water-cut variation, there is water leakage fault in equipment;
4.2), the calculating water percentage that causes of change in dielectric constant for the change slope of stipulated time along with the increase of sampling time number of times, in the short time, slope does not significantly increase continuously, can be judged as the dustiness degree of fluid.
For mill lubrication, sampling time general provision is 30 seconds, the sampling time of multiple that the stipulated time, can be the sampling time also can be, in general, at the water percentage number change h that continuous 3-5 stipulated time calculates
n+1-h
n> 0.3% be namely considered as water percentage at short notice slope have and increase continuously significantly or slope abrupt change occur, wherein h
n+1refer to the water percentage of the tested fluid detected for the N+1 time, h
nrefer to the water percentage of the tested fluid detected for the N time.In actual applications, be not limited to above data, change can be made according to different application places and different plant maintenance technological requirements.
A kind of mill lubrication online oil monitoring device without the need to temperature compensation of the present embodiment and monitoring method thereof, can be used in situ quantitation and analyze oil quality state, provide equipment fault early-warning in time, optimize the drain period, the power generating ratio time, extension device serviceable life.In some application, this monitoring device can as the case may be, use as the instrument measuring contamination level of oil liquid or fluid water percentage separately.
Schematically above be described the present invention and embodiment thereof, this description does not have restricted, and also just one of the embodiments of the present invention shown in accompanying drawing, actual structure is not limited thereto.So, if those of ordinary skill in the art enlightens by it, when not departing from the invention aim, designing the frame mode similar to this technical scheme and embodiment without creationary, all should protection scope of the present invention be belonged to.
Claims (2)
1. the mill lubrication online oil monitoring device without the need to temperature compensation, it is characterized in that: comprise N number of lubrication monitoring modular, wherein N<30 and be positive integer, each lubrication monitoring modular is for monitoring a mill lubrication branch road or a fuel tank, wherein: lubrication monitoring modular comprises capacitive transducer probe electrode (30), capacitive transducer signal processing circuit (31) and collection control transmission circuit (32), described capacitive transducer probe electrode (30) is installed on mill lubrication branch road or fuel tank and immerses tested fluid, this capacitive transducer probe electrode (30) is connected with capacitive transducer treatment circuit (31), the output signal of capacitive transducer treatment circuit (31) is transferred to microprocessor by collection control transmission circuit (32) and data show and memory storage (40), wherein:
Described capacitive transducer probe electrode (30) comprises external electrode (33), target (34) and interior electrode (35), described external electrode (33) is plate-like structure, the cuboid structure that described target (34) is closed for front end, described interior electrode (35) is slab construction, this external electrode (33) is arranged on the side of target (34), the open cavity (36) flow through for tested fluid is formed between described external electrode (33) and target (34), the inside of described target (34) is the enclosed cavity (37) placed for contrast fluid, interior electrode (35) is arranged on the centre position of target (34) enclose inside cavity (37), and external electrode (33), the sidewall of target (34) and interior electrode (35) parallels, external electrode (33) and target (34) form parallel planar capacitor, target (34) and interior electrode (35) form parallel planar capacitor.
2. a kind of mill lubrication online oil monitoring device without the need to temperature compensation according to claim 1, it is characterized in that, described target (34) is provided with the oil hole communicated with enclosed cavity (37) and seal plug (38), this oil hole and the contrast fluid of seal plug (38) for filling, changing and in hermetically enclosed cavity (37).
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| CN201510663039.6A CN105195527B (en) | 2014-09-09 | 2014-09-09 | A kind of oily on-line monitoring method of mill lubrication without temperature-compensating |
| CN201410455530.5A CN104209346B (en) | 2014-09-09 | 2014-09-09 | A kind of mill lubrication online oil monitoring device without the need to temperature compensation and monitoring method thereof |
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| CN201410455530.5A CN104209346B (en) | 2014-09-09 | 2014-09-09 | A kind of mill lubrication online oil monitoring device without the need to temperature compensation and monitoring method thereof |
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| CN105251784B (en) * | 2014-09-09 | 2017-04-26 | 马鞍山马钢华阳设备诊断工程有限公司 | Online monitoring method for water content and pollution degree of lubricating oil of rolling mill |
| DE102016102931B4 (en) * | 2016-02-19 | 2018-09-20 | Dieffenbacher GmbH Maschinen- und Anlagenbau | Device and method for monitoring and / or regulating a state of lubrication in a continuously operating press |
| GB2559791B (en) * | 2017-02-20 | 2021-10-20 | Skf Ab | A method and system of condition monitoring |
| CN113226136B (en) * | 2018-12-21 | 2023-08-11 | 易希提卫生与保健公司 | Detecting a fill state of a consumable dispenser |
| CN109821898B (en) * | 2019-02-13 | 2020-07-28 | 江苏恒丰新材料制造有限公司 | Method for realizing low energy consumption and low oil mist emission in cold continuous rolling process |
| CN113176306B (en) * | 2021-04-25 | 2023-09-12 | 西安石油大学 | Device and method for calculating oil-water ratio in tank body |
| CN113514509A (en) * | 2021-04-26 | 2021-10-19 | 沈阳大工先进技术发展有限公司 | Online oil pollution degree monitoring system based on dielectric constant measurement |
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| FI110287B (en) * | 1999-06-17 | 2002-12-31 | Vaisala Oyj | Method and apparatus for measuring the water content of a liquid |
| CN201060177Y (en) * | 2007-07-19 | 2008-05-14 | 付强 | Data pick-up apparatus for stochastic analyzing water content of lubricant oil |
| US7729870B2 (en) * | 2007-09-05 | 2010-06-01 | Yizhong Sun | Methods for detecting oil deterioration and oil level |
| CN101435788B (en) * | 2008-12-17 | 2012-05-02 | 中国人民解放军国防科学技术大学 | On-line oil liquid monitoring sensor based on permittivity measurement and system thereof |
| EP2224233B1 (en) * | 2009-02-26 | 2018-04-11 | Services Petroliers Schlumberger | A water fraction measuring sensor and method |
| CN102012387B (en) * | 2010-09-28 | 2012-07-04 | 西安交通大学 | Lubricant oil trace moisture sensor probe and online monitoring method |
| CN202420551U (en) * | 2011-01-06 | 2012-09-05 | 北京盈胜泰科技术有限公司 | Liquid oil quality monitoring system |
| CN102628821B (en) * | 2012-03-27 | 2014-01-29 | 西安交通大学 | On-line lubrication oil trace moisture sensor based on conductivity measurement |
| CN103675463A (en) * | 2012-09-12 | 2014-03-26 | 北京大学深圳研究生院 | Liquid dielectric constant measuring system self-adapting to scale and precision |
| CN103017863A (en) * | 2012-12-12 | 2013-04-03 | 重庆德格科技发展有限公司 | Parallel-plate multi-electrode capacitance type oil level sensor |
| CN203164152U (en) * | 2013-01-24 | 2013-08-28 | 大连海事大学 | Portable device for measuring water content in lubricating oil |
| CN204035195U (en) * | 2014-09-09 | 2014-12-24 | 马鞍山马钢华阳设备诊断工程有限公司 | A kind of mill lubrication online oil monitoring device without the need to temperature-compensating |
| CN105251784B (en) * | 2014-09-09 | 2017-04-26 | 马鞍山马钢华阳设备诊断工程有限公司 | Online monitoring method for water content and pollution degree of lubricating oil of rolling mill |
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| CN104209346A (en) | 2014-12-17 |
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