CN104697910B - The detecting line sensor of ferromagnetism abrasive grain content in a kind of lubricating oil - Google Patents

The detecting line sensor of ferromagnetism abrasive grain content in a kind of lubricating oil Download PDF

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CN104697910B
CN104697910B CN201510097363.6A CN201510097363A CN104697910B CN 104697910 B CN104697910 B CN 104697910B CN 201510097363 A CN201510097363 A CN 201510097363A CN 104697910 B CN104697910 B CN 104697910B
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filter disc
train wheel
wheel bridge
sensor
electrode
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CN104697910A (en
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马骁驰
张向军
经昊达
孟永钢
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Tsinghua University
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Tsinghua University
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Abstract

The present invention relates in a kind of lubricating oil ferromagnetism abrasive grain content detecting line sensor, belong to measuring instrument technical field.In this sensor, filter disc is fixed between filter disc lower plate and filter disc train wheel bridge, the central authorities of filter disc lower plate and filter disc train wheel bridge have the square hole with the asphalt channel same size of to be used detection sensor, and the left side of filter disc train wheel bridge and right side have square hole.Electric current input and output electrode and in front and back detecting electrode are fixed on by electrode fixed plate in the square hole of filter disc train wheel bridge respectively.The detecting line sensor of the present invention, by the carbon fiber filter screen of design series connection different pore size, can simultaneously in on-line measurement fluid multiple size ferromagnetic particle content, and analyze speed is fast, and measuring accuracy is higher;Carbon fiber filter disc used in sensor, because the resistivity of carbon fiber varies with temperature very little, the Applicable temperature scope of therefore sensor is larger, has expanded the application of sensor.

Description

The detecting line sensor of ferromagnetism abrasive grain content in a kind of lubricating oil
Technical field
The present invention relates in a kind of lubricating oil ferromagnetism abrasive grain content detecting line sensor, belong to measuring instrument skill Art field.
Background technology
The mechanical part of the overwhelming majority is to be made based on ferrous material.Actual machine run in, due to friction with The generation of abrasion, moving surface material would generally be come off in the form of wear particle, and incorporates in lubricating oil.Mechanical Wear Process It is generally divided into three phases, i.e. running-in wear, stable abrasion and sharp wear.Generally there is stable abrasion in mechanical normal work, Its wear extent is less.When the rate of depreciation of material increases suddenly, when particularly in lubricating oil, big particle diameter ferromagnetism abrasive particle occurs, past Occur toward indication sharp worn.If repairing not in time, it will cause the generation of fault.Detection ferromagnetic grain in lubricating oil contains Amount can learn the wear condition of machinery in time, with other diagnostic methods compared with vibratory drilling method, performance parameter method etc., can be more Clearly, forecast the abnormality of machinery early, it is to avoid accident occurs.
At present, the domestic test with regard to ferromagnetic particle in fluid is mainly analyzed using Spectral Analysis Technology, that is, to making With in lubricating oil carry out periodic sampling, by magnetic force, the ferromagnetic grain in fluid is separated and makes ferrum spectral slice, by aobvious Micro mirror carrys out the ferromagnetic particle distribution situation in observation and analysis fluid.The advantage adopted in this way is the size model of Observable abrasive particle Enclose big, maximum can reach 250um;And because the method is carried out to the form, size and other features that precipitate abrasive particle in oil sample Directly observe, accuracy of detection is high.But Spectral Analysis Technology can only sample preparation and operation in laboratory environments, belong to offline inspection Survey it is impossible to real-time monitoring is carried out to operating plant equipment, thus being easy to miss the Best Times of failure prediction.Accordingly, it is capable to The online measuring technique of enough real-time monitoring equipment wearing granules is the timely crucial direction forecasting that machinery is abnormal.
Lubricating oil ferromagnetic particle online measuring technique, mainly passes through to dispose detecting line sensor in a device to lubrication Granule content in oil carries out real-time monitoring.Existing sensor is based on magnetic field type ferromagnetic particle sensor at present, specifically such as:
1st, CN 102331390 A (flowing oil metal particle on-line monitoring sensor)
Liquid flow channel for oil is surrounded using coil, forms magnetic field by alternating current is applied to coil in runner, and in runner Ferromagnetic particle content in fluid can change the pcrmeability of whole runner, and then changes magnetic field intensity.By to magnetic field intensity Change is detected, can convert and obtain the content of ferromagnetic particle in fluid.The shortcoming of this sensor is to be only used for ferromagnetic The total content of granule is measured it is impossible to distinguish the distribution of particles of different-grain diameter.
2nd, CN 101806692 A (a kind of on-line monitoring plant for ferromagnetic grains in engine oil)
It is permanent magnet using the one end being placed on oil circuit caliber, one end is the sensor of electric magnet.Permanent magnetic The magnetic field intensity that ferrum provides is constant, and the pcrmeability of oil circuit caliber is affected by ferromagnetic particle in fluid, ferromagnetic particle content Higher, pcrmeability is bigger.Patent is by being examined using the method for measurement electric magnet and supply voltage numerical value during permanent magnet adhesive Survey the pcrmeability change in oil circuit caliber, and and then calculate the content of ferromagnetic particle in fluid.The shortcoming of this monitoring device is, The total content of ferromagnetic particle equally can only be detected it is impossible to measure to the ferromagnetic particle of specified particle diameter size.
3rd, CN 101963570 A (device of quick detection ferromagnetic grain in lubricating oil and detection method and signal processing Circuit)
Be respectively equipped with the equidistant position in excitation coil two ends using with alternating magnetic field a detection coil and Balance coil, by sample near detection coil, detects the difference of two induction coils, final table by testing circuit Levy out the ferromagnetic grain content of detected sample.The shortcoming of this detection method is the ferromagnetic particle content it is impossible to different-grain diameter Make a distinction.
The particle diameter distribution of ferromagnetic particle is an important indicator judging state of wear.Produce in the case of equipment stable operation Ferromagnetic particle particle diameter be usually more than 10 μm.Then imply that sharp wear occurs when particle diameter is more than 40 μm, machinery Equipment is in the misoperation stage, should stop at once and keep in repair.Though and visible magnetic field type ferromagnetic particle sensor from the discussion above The on-line measurement to fluid so can be realized, but all cannot be distinguished by the size of tested ferromagnetic particle, have using limitation Property.
Content of the invention
The purpose of the present invention is to propose in a kind of lubricating oil ferromagnetism abrasive grain content detecting line sensor, for upper The shortcoming stating prior art, improves to the structure of existing detection method and detection means, so that the structure of detection means Simply, operate reliable, analyze speed is fast, and can measure simultaneously different-grain diameter size ferromagnetic grain content in lubricating oil Line sensor.
The detecting line sensor of ferromagnetism abrasive grain content in lubricating oil proposed by the present invention, including under filter disc, filter disc Clamping plate, filter disc train wheel bridge, current input electrode, electric current output electrode, front detecting electrode and rear detecting electrode;Described filter disc is solid It is scheduled between filter disc lower plate and filter disc train wheel bridge, the central authorities of filter disc lower plate and filter disc train wheel bridge have and to be used The through hole of the asphalt channel same size of detection sensor, the left side of filter disc train wheel bridge and right side have through hole;Described Current input electrode and front detecting electrode are fixed on by electrode fixed plate in the PATENT left side via of filter disc train wheel bridge respectively, described Electric current output electrode and rear detecting electrode are fixed in the right side through hole of filter disc train wheel bridge by electrode fixed plate respectively.
In above-mentioned detection sensor, described filter disc material is carbon fiber.
The detecting line sensor of ferromagnetism abrasive grain content in lubricating oil proposed by the present invention, its advantage is:
1st, in lubricating oil proposed by the present invention ferromagnetism abrasive grain content detecting line sensor, by design connect not With the carbon fiber filter screen in aperture, can simultaneously in on-line measurement fluid multiple size ferromagnetic particle content, therefore permissible Make up the deficiency of existing on-line testing technique, and there is more preferable practicality.
2nd, because ferromagnetic particle is very big to the resistivity effects of carbon fiber filter disc, therefore sensed using the detection of the present invention Device, analyze speed is fast, and measuring accuracy is higher.
3rd, carbon fiber filter disc used in detecting line sensor of the present invention, the resistivity due to carbon fiber varies with temperature The Applicable temperature scope of very little, therefore sensor is larger, has expanded the application of sensor.
4th, the detecting line sensor of the present invention, simple for structure, changes the easy to operate of carbon fiber filter disc during use, The long service life of carbon fiber filter disc, therefore effectively reduces testing cost.
Brief description
Fig. 1 is the structural representation of the detecting line sensor of ferromagnetism abrasive grain content in lubricating oil proposed by the present invention Figure.
Fig. 2 is the use state figure of inventive sensor.
In Fig. 1 and Fig. 2,1 is current input electrode, and 2 is electric current output electrode, and 3 is front detecting electrode, 4 be after detection electricity Pole, 5 is electrode fixed plate, and 6 is seal washer, and 7 is filter disc lower plate, and 8 is filter disc train wheel bridge, and 9 is filter disc, and 10 is that oil circuit leads to Road.
Specific embodiment
The detecting line sensor of ferromagnetism abrasive grain content in lubricating oil proposed by the present invention, its structural representation is as schemed Shown in 1, including filter disc 9, filter disc lower plate 7, filter disc train wheel bridge 8, current input electrode 1, electric current output electrode 2, front detection electricity Pole 3 and rear detecting electrode 4.Filter disc 9 is fixed between filter disc lower plate 7 and filter disc train wheel bridge 8, on filter disc lower plate 7 and filter disc The central authorities of clamping plate 8 have the side with asphalt channel 10 (as shown in Figure 2) same size of to be used detection sensor Hole.The left side of filter disc train wheel bridge 8 and right side have square hole, and current input electrode 1 and front detecting electrode 3 pass through electrode respectively Fixed plate 5 is fixed in the left side square hole of filter disc train wheel bridge 8, and electric current output electrode 2 and rear detecting electrode 4 pass through electrode admittedly respectively Fixed board 5 is fixed in the right side square hole of filter disc train wheel bridge 8.
In above-mentioned detecting line sensor, filter disc 9 is fixedly clamped by filter disc train wheel bridge 8 and filter disc lower plate 7 respectively, wherein Clamping plate adopts insulating material, and electric conductivity is negligible.Afterwards filter disc clamping plate is inserted in oil circuit siphunculus 10, solid using step Fixed, seal washer 6 plays the sealing function preventing fluid from revealing, the center of filter disc lower plate 7 and filter disc train wheel bridge 8 in junction Place there is a rectangular opening equal with oil circuit cross-sectional area so that carbon fiber filter disc 9 can in oil circuit siphunculus abundant and fluid Contact.The edge of filter disc train wheel bridge 8 is two through holes it is therefore an objective to enable galvanic electrode and detecting electrode and carbon fiber filter disc 9 Contact, as depicted in figs. 1 and 2.
During use, by the sensor insertion asphalt channel 10 shown in Fig. 1, apply a pressure in the upper end of asphalt channel 10 Power source, from top to bottom (as denoted by the arrows in fig. 2) by lubricating oil to be measured, lubricating oil sequentially passes through upper, middle and lower three The aperture of carbon fiber filter disc, wherein filter disc is different, and maximum, lower end filter disc the aperture in aperture of upper end filter disc is minimum.Lubricating oil Middle particle diameter is more than the ferromagnetic particle in filter disc aperture and non-ferromagnetic granule is attracted on filter disc, and the less granule of particle diameter then passes through Filter disc.Ferromagnetic particle can reduce the resistivity of filter disc, rather than ferromagnetic particle mostly is gravel, is insulator, does not affect the electricity of filter disc Resistance rate changes.Therefore by measuring to the resistivity variation of different carbon fiber filter discs, may finally obtain adsorbing in this filter Ferromagnetic particle content on piece, so that it is determined that in fluid different-grain diameter ferromagnetic particle content distribution situation.
In the detection sensor of the present invention, choose the sensing element that carbon fiber filter disc detects as ferromagnetic particle.Carbon fiber Specific insulation be about 1.70 × 10-5Ω m, and vary with temperature very little;And the ferromagnetic particle in fluid is mainly with iron material Based on material, its specific insulation is 9.78 × 10-8Ω·m.It can be seen that resisitivity 3 number of carbon fiber and ferromagnetic particle material Magnitude, after absorption ferromagnetic particle on carbon fiber, the resistivity of its whole filter disc can change, and variable quantity and absorption Ferromagnetic particle content is proportional, can learn that ferromagnetic particle on this filter disc for the absorption contains by the change in resistance of measurement Amount.
The carbon fiber filter disc of different pore size can be adopted in the detection sensor of the present invention, be connected in asphalt channel, real The hierarchical detection of existing ferromagnetic particle.

Claims (1)

1. in a kind of lubricating oil the detecting line sensor of ferromagnetism abrasive grain content it is characterised in that this detection sensor includes Filter disc, filter disc lower plate, filter disc train wheel bridge, current input electrode, electric current output electrode, front detecting electrode and rear detecting electrode; Described filter disc is fixed between filter disc lower plate and filter disc train wheel bridge, and the central authorities of filter disc lower plate and filter disc train wheel bridge open respectively The through hole with the asphalt channel same size of to be used detection sensor, the left side of filter disc train wheel bridge and right side is had to have Through hole, described filter disc material is carbon fiber;Described current input electrode and front detecting electrode pass through electrode fixed plate respectively It is fixed in the PATENT left side via of filter disc train wheel bridge, described electric current output electrode and rear detecting electrode pass through electrode fixed plate respectively It is fixed in the right side through hole of filter disc train wheel bridge.
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CN105043939A (en) * 2015-06-29 2015-11-11 广州机械科学研究院有限公司 Device and method for adsorbing and releasing abrasive particles during process of obtaining abrasive particle image information
CN106018220A (en) * 2016-05-12 2016-10-12 李伟波 Abrasion particle on-line monitoring method with hydraulic pressure filtering, centrifugation and adjacent capacitors
CN105842305A (en) * 2016-05-12 2016-08-10 李伟波 Method for monitoring wear particles with hydraulic filtering, centrifugal separation and adjacent capacitors
CN106018212A (en) * 2016-05-12 2016-10-12 李伟波 Wear particle online monitoring method using filtering, centrifugation and adjacent capacitance
CN106018499A (en) * 2016-05-12 2016-10-12 李伟波 Wear particle online monitoring method using hydraulic filtering, centrifugation and adjacent capacitance
CN105973777A (en) * 2016-05-12 2016-09-28 李伟波 Method for monitoring wear particles on line by virtue of filtration, electromagnetic centrifugation and adjacent capacitance
CN106018213A (en) * 2016-05-12 2016-10-12 李伟波 Wear particle monitoring method using filtering, electromagnetic centrifugal separation and adjacent capacitance
CN106018218A (en) * 2016-05-12 2016-10-12 李伟波 Wear particle monitoring method achieved through hydraulic filtration, electromagnetic centrifugation and adjacent capacitance
CN108801868A (en) * 2017-05-03 2018-11-13 北京至感传感器技术研究院有限公司 Particulate matter on-line monitoring system in liquid oil
CN108871910B (en) * 2018-09-13 2024-01-26 大连海事大学 Device and method for separating microparticles in lubricating oil for inductance detection method
CN110006656B (en) * 2019-04-15 2020-08-07 厦门大学 Multifunctional lubricating oil abrasive particle collecting film and engine wear state diagnosis method
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CN111426611B (en) * 2020-03-12 2021-09-21 北京理工大学 Rotational flow abrasion particle detection sensor and dispersion effect analysis method thereof
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