CN105889181A - Monitoring method adopting rotating magnetic-filed centrifuging, adsorbing and proximity capacitance for wear particles - Google Patents
Monitoring method adopting rotating magnetic-filed centrifuging, adsorbing and proximity capacitance for wear particles Download PDFInfo
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- CN105889181A CN105889181A CN201610311702.0A CN201610311702A CN105889181A CN 105889181 A CN105889181 A CN 105889181A CN 201610311702 A CN201610311702 A CN 201610311702A CN 105889181 A CN105889181 A CN 105889181A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
Abstract
The invention relates to a monitoring method adopting rotating magnetic-filed centrifuging, adsorbing and proximity capacitance for wear particles. The monitoring method is characterized in that online monitoring of the wear particles is realized by a temperature control module, a magnetization module, a rotating magnetic field centrifugal module, an adsorption module, a proximity capacitance particle monitoring module and a demagnetization module in sequence; an oil inlet is formed in one end of the temperature control module; an oil outlet is formed in one end of the demagnetization module; and the demagnetization module consists of a residual magnetism sensor and a demagnetizer. According to the monitoring method disclosed by the invention, a proximity capacitance sensor technology based on a capacitance edge effect is introduced, and non-intrusive and unconstrained monitoring of the wear particles is realized; the wear particles in the oil are magnetized and polymerized into large particles by magnetizing and mechanical centrifuging, and move near a pipe wall and are adsorbed by the adsorption module, so that the intensity of an output monitoring signal of a proximity capacitance sensor is improved; and by using the temperature control module and reasonably designing the structure of a polar plate layer of the proximity capacitance sensor, noises are inhibited and overall performance of a monitoring device of the proximity capacitance sensor is optimized.
Description
[technical field]
The present invention relates to the wear particle on-line monitoring method in a kind of fluid pressure line fluid, be specifically related to a kind of rotating excitation field and be centrifuged, adsorb and the wear particle monitoring method of adjacent capacitor, belong to hydraulic system technical field.
[background technology]
Wear particle in hydraulic system oil liquid not only can make kinematic pair produce abrasive wear but also the relative motion of kinematic pair can be made to be obstructed and cause control component actuation malfunctioning.Statistics both domestic and external show, hydraulic machinery 70% fault is derived from the particle contamination of fluid.Therefore, the wear particle in fluid is carried out on-line monitoring and has become one of important channel reducing abrasion and hydraulic system fault.
Capacitance sensor is applied to the pollution monitoring of machine fluid because it is easy to make, with low cost.Patent documentation 1(Chinese invention patent Authorization Notice No. CN101435788B) disclose a kind of online oil liquid monitoring sensor based on dielectric constant measurement and system thereof, the sensor of this invention includes bearing and is fixed on three poles of inside, three poles constitute differential cylindrical capacitor, the minor variations of sensor capacitance value can be monitored, thus the anti-minor variations pushing away fluid dielectric constant, and then realize the enforcement to contamination level of oil liquid and monitor.Sensor pole in this monitoring method is immersed in fluid, causes the change of fluid fluidised form, have impact on certainty of measurement；Fluid can form deposition oil film on sensor pole surface, not only causes certainty of measurement to decline, and the most also brings sensor to clean problem.
Document 2(Zhao Xin pool etc., Wuhan Univ. of Water Conservancy and Electric Power's journal, 1999(3)) disclosing a kind of Probe with Capacitor Sensor Used in Oil Monitoring, this probe is made up of a cylindrical glass pipe and the two halves circular electrode being close to this pipe outer wall, and it is substantially parallel plate capacitor sensor.This capacitance sensor excitation pole plate is retrained by conduit under fluid pressure diameter with receiving polar plate spacing, and owing to conduit under fluid pressure diameter is relatively large, this transducer sensitivity is not ideal enough.
Therefore, for solving above-mentioned technical problem, the absorption centrifugal by rotating excitation field of a kind of innovation of necessary offer and the wear particle monitoring method of adjacent capacitor, to overcome described defect of the prior art.
[summary of the invention]
For solving above-mentioned technical problem, it is an object of the invention to provide that a kind of rotating excitation field is centrifugal, absorption and the wear particle monitoring method of adjacent capacitor, its use non-invasive metering system, to measured without restrictive, signal is strong and highly sensitive, low cost, environmental suitability are strong in monitoring.
For achieving the above object, the technical scheme that the present invention takes is: a kind of rotating excitation field is centrifuged, adsorbs and the wear particle monitoring method of adjacent capacitor, it uses a kind of wear particle monitoring device, and this equipment includes that temperature control module, magnetized module, rotating excitation field are centrifuged module, adsorption module, adjacent capacitor particulate matter monitoring module and demagnetization module；Wherein, described temperature control module, magnetized module, rotating excitation field are centrifuged module, adsorption module, adjacent capacitor particulate matter monitoring module and demagnetization module and are sequentially connected with；One end of described temperature control module is provided with fluid entrance；One end of described demagnetization module is provided with fluid outlet, and it is made up of remanent magnetism sensor and demagnetizer；It comprises the steps:
1), the fluid in fluid pressure line carries wear particle and passes through temperature control module, controls oil liquid temperature by temperature control module constant at 42 DEG C；
2), magnetized module is force-magnetized by the wear particle that carries in fluid, makes micron-sized wear particle aggregate into bulky grain；
3), magnetization aggregated particles is centrifuged in rotating excitation field module, makes particle aggregation at near-wall；
4), adsorption module adsorbs the magnetization big microgranule of polymerization being gathered in near-wall after rotated magnetic field module is centrifuged；
5), by wear particle situation in adjacent capacitor particulate matter monitoring module online monitoring fluid pressure line；
6), demagnetization module is to magnetized particles demagnetization.
, the absorption centrifugal by rotating excitation field of the present invention and the wear particle monitoring method of adjacent capacitor be further: described temperature control module includes heater, cooler and temperature sensor；Described heater uses the lubricating oil heater of the Chongqing gold letter of band temperature detection；Remover for surface evaporation type air cooling selected by described cooler, and the finned tube of cooler selects KLM type finned tube；Temperature sensor uses platinum resistance temperature sensor.
, the absorption centrifugal by rotating excitation field of the present invention and the wear particle monitoring method of adjacent capacitor be further: described magnetized module includes aluminum matter pipeline, some windings, iron shell, flange and some magnetizing current output modules；Wherein, described some windings are rotating around outside aluminum matter pipeline, and each winding is made up of positive winding and inverse winding, and the size of current in positive winding and inverse winding is equal；Described iron shell is coated on aluminum matter pipeline；Described flange welding is at the two ends of aluminum matter pipeline；Each magnetizing current output module is connected to a winding.
, the absorption centrifugal by rotating excitation field of the present invention and the wear particle monitoring method of adjacent capacitor be further: described rotating excitation field is centrifuged module and includes aluminum matter pipeline, iron shell, three-phase symmetric winding, flange and three-phase symmetrical current module；Described three-phase symmetric winding is wound on outside aluminum matter pipeline；Described iron shell is coated on aluminum matter pipeline；Described flange welding is at the two ends of aluminum matter pipeline；Described three-phase symmetrical current module connects described three-phase symmetric winding.
, the absorption centrifugal by rotating excitation field of the present invention and the wear particle monitoring method of adjacent capacitor be further: described adsorption module uses homopolarity adjacent type absorbing ring；Described homopolarity adjacent type absorbing ring includes aluminium ring shape pipeline, forward solenoid, reverse solenoid and irony magnetic conduction cap；Described forward solenoid and reverse solenoid are respectively arranged in aluminium ring shape pipeline, and both are connected with electric current in opposite direction so that forward solenoid and reverse solenoid adjacent produce like pole；Described irony magnetic conduction cap is arranged on the inwall of aluminium ring shape pipeline, and it is positioned at forward solenoid and reverse solenoid adjacent and forward solenoid and the intermediate point of reverse solenoid axis.
, the absorption centrifugal by rotating excitation field of the present invention and the wear particle monitoring method of adjacent capacitor be further: described adsorption module uses the homopolarity adjacent type absorbing ring of charged hammer；The homopolarity adjacent type absorbing ring of described charged hammer includes aluminium ring shape pipeline, forward solenoid, reverse solenoid, irony magnetic conduction cap, dividing plate, electric shock hammer and electric magnet；Described forward solenoid and reverse solenoid are respectively arranged in aluminium ring shape pipeline, and both are connected with electric current in opposite direction so that forward solenoid and reverse solenoid adjacent produce like pole；Described irony magnetic conduction cap is arranged on the inwall of aluminium ring shape pipeline, and it is positioned at forward solenoid and reverse solenoid adjacent and forward solenoid and the intermediate point of reverse solenoid axis；Described dividing plate is between forward solenoid and reverse solenoid；Described electric shock hammer and electric magnet are between dividing plate；Described electric magnet connects and can promote electric shock hammer, makes electric shock hammer tap aluminium ring shape inner-walls of duct.
, the absorption centrifugal by rotating excitation field of the present invention and the wear particle monitoring method of adjacent capacitor be further: described adjacent capacitor particulate matter monitoring module includes organic glass inner wall, ground shield, reception pole plate, excitation pole plate and outer wall；Wherein, described machine glass inner wall, ground shield and outer wall in tubular construction, and successively from-inner-to-outer arrange；The thickness of described machine glass inner wall is 0.5mm, and dielectric constant is 2.5；The dielectric constant of described ground shield is 1.5-2.5, and thickness is 1 to 2 times of outer wall thickness；Described reception pole plate, excitation pole plate are embedded in ground shield, and are positioned at outside machine glass inner wall；Described reception pole plate, excitation pole plate all use Peano curve structure pole plate layer, are provided with sealing coat between the two；The width of described sealing coat is 0.8-1 times of lucite inner wall thickness.
, the absorption centrifugal by rotating excitation field of the present invention and the wear particle monitoring method of adjacent capacitor be also: it includes that an ECU, described remanent magnetism sensor, demagnetizer, heater, cooler, temperature sensor, magnetizing current output module, rotating excitation field are centrifuged module, adsorption module and adjacent capacitor particulate matter monitoring module and are all electrically connected on ECU.
Compared with prior art, there is advantages that
1. the magnetized module of the multipair forward and reverse loop construction of the present invention, coil current can numeral set online, to produce the non-uniform magnetic-field that magnetization needs, make the wear particle in fluid force-magnetized and aggregate into bulky grain, making colloidal particles decompose simultaneously and melt and suppress air bubble growth；Magnetic field is centrifuged module and makes magnetic microparticles " separate " and move to cavity wall；Polymeric macroparticle is magnetized by adsorption module capture duct wall surface.
2. in fluid pressure line wear particle monitoring device, introduce adjacent capacitive sensors based on electric capacity edge effect, by wear particle magnetizing, aggregates into bulky grain and centrifugal being adsorbed onto tube wall to improve granule density, increase the dielectric constant of tube wall surface fluid, greatly improve sensor output signal strength the ingenious contradiction solving signal intensity and the conflict of penetration depth index.
3. in pole plate layer designs, introduce efficient frontier length and baroque Peano curve structure.In this Peano curve structure pole plate layer, the curve of excitation pole plate, reception pole plate and isolation pole plate composition can travel through all of point in square pole plate layer, obtains a curve being full of whole square pole plate sheaf space.In the case of pole plate aspect is long-pending fixing, this structure has the longest efficient frontier, maximum polar plate area and labyrinth, obtains optimum signal intensity with this.
4. the fluid pressure line wear particle monitoring technology route that temperature control module, magnetized module, rotating excitation field are centrifuged module, adsorption module, adjacent capacitor particulate matter monitoring module combine, both ensure that monitoring reliability, and the overall performance simultaneously making again monitoring system is optimum.
[accompanying drawing explanation]
Fig. 1 is the structural representation of the wear particle monitoring device of, the absorption centrifugal by rotating excitation field of the present invention and adjacent capacitor.
Fig. 2 is the structure chart of the magnetized module in Fig. 1.
Fig. 3 is the structure chart of the magnetizing coil in Fig. 2.
Fig. 4 is the structure chart of the magnetizing current output module in Fig. 2.
Fig. 5 is that the rotating excitation field in Fig. 1 is centrifuged module diagram.
Fig. 6 be the adsorbent equipment in Fig. 1 be the structural representation of homopolarity adjacent type absorbing ring.
Fig. 7 be the adsorbent equipment in Fig. 1 be the structural representation of the homopolarity adjacent type absorbing ring of charged hammer.
Fig. 8-1 is the radial direction semi-cutaway of the adjacent capacitor particulate matter monitoring module in Fig. 1.
Fig. 8-2 is the transverse cross-sectional view of the adjacent capacitor particulate matter monitoring module in Fig. 1.
Fig. 8-3 is receiving pole plate and encouraging the schematic diagram of pole plate in Fig. 8-1.
Fig. 8-4 is the partial enlarged drawing in Fig. 8-3 at A.
Fig. 9 is the connection diagram of ECU.
[detailed description of the invention]
Refer to shown in Figure of description 1 to accompanying drawing 9, the present invention is that a kind of rotating excitation field is centrifugal, adsorbs and the wear particle monitoring device of adjacent capacitor, and it is centrifuged several parts such as module 4, adsorption module 5, adjacent capacitor particulate matter monitoring module 6, demagnetization module 7 and ECU10 is formed by temperature control module 1, magnetized module 2, rotating excitation field.Wherein, described temperature control module 1, magnetized module 2, rotating excitation field are centrifuged module 4, adsorption module 5, adjacent capacitor particulate matter monitoring module 6 and demagnetization module 7 and are sequentially connected with.
One end of described temperature control module 1 is provided with fluid entrance 8, and for by defeated for hydraulic oil people's device, it is made up of heater, cooler and temperature sensor.This temperature control module 1 main purpose is to provide optimal magnetization temperature about 42 DEG C for magnetizing assembly.Meanwhile, temperature is as topmost environment noise, and different temperature can cause the fluid dielectric constant in fluid pressure line that notable change occurs, and keeps temperature constant that adjacent capacitive sensors can be avoided to be affected by temperature noise.
Described heater is electric heater, can use the lubricating oil heater of the Chongqing gold letter of band temperature detection own.Cooler can be selected for remover for surface evaporation type air cooling, the advantage having water-cooled and air cooling concurrently, good heat dissipation effect, uses light pipe, and fluid resistance is little；Cooler fin type is high wing, and finned tube selects KLM type finned tube, good heat-transfer, and thermal contact resistance is little, and fin and pipe contact area are big, and closely, firmly, it is good to bear cold and hot sudden turn of events ability, and fin root weather-resistant performance is high in laminating；The bank of tubes number optimum of air cooler is 8.Temperature sensor uses platinum resistance temperature sensor.
Described magnetizing assembly 2 can force-magnetized by the wear particle that carries in fluid, and make micron-sized wear particle aggregate into bulky grain, the output signal strength of adjacent capacitive sensors can be improved.Meanwhile, from electromagnetic theory, magnetic field intensity is the biggest, the biggest to the captivation of ferromagnetic particle, and large-sized iron granules translational speed is more faster than undersized iron granules, wear particle is aggregated into bulky grain and also allows for later separation.
The dielectric constant of the colloidal particles carried in fluid and the dielectric constant of bubble and hydraulic oil and wear particle is different from, impact in order to avoid adjacent capacitive sensors below is monitored, need to design non-uniform magnetic-field and decompose or remove colloidal particles and bubble.
Molecular alignment is made to discuss according to magnetic field, when fluid flows through magnetic field, magnetic field produces certain impact to the athletic meeting of the colloidal particles in fluid so that colloidal particles makees olderly flowage in pipeline, decrease being connected with each other of colloidal particles, thus play the viscosity reduction effect separating colloidal particles.Meanwhile, there is cohesiveness between magnetized granule, this power limits the formation of bubble and grows up.During bubble-free, the magnetic line of force in fluid is evenly distributed, and is in the steady state of magnetic.When there being bubble in fluid, the magnetic line of force of bubble local occurs curved had, by, the magnetic line of force of bending, the most uniform, parallel, the trend of steady statue that reverts to, thus produces the magnetic tension pointing to bubble center, and this power can limit growing up of bubble.
But magnetic field is the strongest or the most weak magnetic treating result being all difficult to obtain.When magnetic induction is near a certain value, magnetic treatment has optimum efficiency.Equally, the highest and the lowest viscosity reducing effect of temperature is the most bad.The viscosity reduction that decomposes of the colloidal particles in hydraulic oil needs certain temperature and magnetic field intensity, representative value be magnetic field intensity at about 200mT, temperature about 42 DEG C.The impact that during design non-uniform magnetic-field, the edge effect in magnetic field to be considered is caused, one end that magnetic induction should be designed as flowing at fluid is stronger, and it is more weak in one end that fluid flows out, meet fluid outflow end, reduce magnetic field, alleviate the requirement that edge effect affects, ensure the magnetic efficiency flowing into end at fluid simultaneously.
The magnetizing assembly of the present invention is made up of aluminum matter pipeline 21, some windings 22, iron shell 23, flange 24 and some magnetizing current output modules 25.Wherein, described aluminum matter pipeline 21 makes fluid flow there through and by magnetization treatment, and the pcrmeability of aluminum is the lowest, can make to obtain in pipeline 21 higher magnetic field intensity.
Described some windings 22, rotating around outside aluminum matter pipeline 21, are coated insullac by the copper wire of a diameter of about 1.0mm and make.Each winding 22 is all separate setting, is controlled by corresponding magnetizing current output module 25 respectively, and wherein electric current needs different according to system.Separate owing to often enclosing winding 22, the electric current loop that its exit can cause this coil to form is not real " justifying ", but has individual breach, and this can cause the radial distribution of aluminum matter pipeline 21 internal magnetic field uneven, thus affects magnetic efficiency.For solving this problem, the often circle winding 22 of this creation is all made up of positive winding 26 and inverse winding 27 in order to produce the magnetic field in same polarity direction and to make up the magnetic field that breach causes unbalanced simultaneously.Size of current in positive winding and inverse winding is equal.Aluminum matter pipeline 21 axis direction is arranged with multipair forward and reverse winding, by different electric currents, in order to form the non-uniform magnetic-field of aforementioned claim.
Described iron shell 23 is coated on aluminum matter pipeline 21, and the material of irony can mask most magnetic flux.Described flange 24 is welded on the two ends of aluminum matter pipeline 21.
Each magnetizing current output module 25 is connected to a winding 22, and by ECU10 control, it utilizes digital potentiometer to have and ECU10 real-time communication the feature of real time modifying resistance, it is achieved the real-time control of non-uniform magnetic-field.Described magnetizing current output module 25 use digital potentiometer be AD5206, there is the output of 6 passages, can and ECU between realize single bus data transmission.ECU realizes the current settings of polylith magnetizing current output module to magnetization winding and constant output by monobus.Amplifier AD8601 and metal-oxide-semiconductor 2N7002 achieve high-precision voltage follow by negative feedback and export.Constant High-current output have employed amplifier OPA 549 of the high voltage of Texas Instrument (TI), big electric current.
Referring to shown in Figure of description 5, described rotating magnetic field device 4 is for being centrifuged magnetization polymeric macroparticle, and it is made up of aluminum matter pipeline 41, iron shell 42, three-phase symmetric winding 43, flange 44 and three-phase symmetrical current module 45.Described three-phase symmetric winding 43 is wound on outside aluminum matter pipeline 41.Described iron shell 42 is coated on aluminum matter pipeline 41.Described flange 44 is welded on the two ends of aluminum matter pipeline 41.Described three-phase symmetrical current module 45 connects described three-phase symmetric winding 43, and by ECU10 control.
The operation principle of described rotating magnetic field device 4 is as follows: after magnetization polymeric macroparticle enters described rotating magnetic field device 4 with fluid, flowing through three-phase symmetrical electric current in three-phase symmetric winding 43, this electric current produces rotating excitation field in aluminum matter pipeline 41.Magnetized particles is acted on by magnetic field force under rotating excitation field effect, and the most spirally advances, simultaneously to aluminum matter pipeline 41 vessel wall motion.Reasonable adjusting magnetic field intensity can make the granule in fluid " separate " out from fluid, is gathered in aluminum matter pipeline 41 near-wall, it is simple to subsequent adsorbtion.
Described adsorption module 5 is polymerized big microgranule for adsorbing the magnetization being gathered in near-wall after rotated magnetic field device 4 is centrifuged.Referring to shown in Figure of description 6, when described adsorption module 5 uses homopolarity adjacent type absorbing ring, this homopolarity adjacent type absorbing ring is made up of parts such as aluminium ring shape pipeline 51, forward solenoid 52, reverse solenoid 53 and irony magnetic conduction caps 54.Wherein, described forward solenoid 52 and reverse solenoid 53 are respectively arranged in aluminium ring shape pipeline 51 and by ECU10 control, and both are connected with electric current in opposite direction so that forward solenoid 52 and reverse solenoid 53 adjacent produce like pole.Described irony magnetic conduction cap 54 is arranged on the inwall of aluminium ring shape pipeline 51, and it is positioned at forward solenoid 52 and reverse solenoid 53 adjacent and forward solenoid 52 and the intermediate point of reverse solenoid 53 axis.
The design principle of described homopolarity adjacent type absorbing ring is as follows: have the energization solenoid of multiple ribbon core, adjacent solenoid coil to be connected with electric current in opposite direction inside absorbing ring so that forward solenoid and reverse solenoid adjacent produce like pole.Simultaneously, irony magnetic conduction cap it is provided with at the absorbing ring inwall of forward solenoid and reverse solenoid adjacent and forward solenoid and reverse solenoid axis intermediate point, parallel with absorbing ring axis in strip, the shell of absorbing ring is paramagnetism aluminum matter outer tube wall, this set is conducive to improving magnetic circuit, strengthen the magnetic field intensity at absorbing ring inwall, strengthen the capture absorbability to granule.Each solenoid current is directly controlled by ECU, can be different with concentration and change, to obtain optimal adsorption performance according to the size of granule.After having adsorbed, ECU controls electric magnet power-off, and paramagnetism aluminum matter pipeline loses magnetism, and is attached to magnetic polymeric bulky grain on inner-walls of duct and enters adjacent capacitor particulate matter monitoring module with fluid along tube wall.
Further, the homopolarity adjacent type absorbing ring that described adsorbent equipment 5 may be used without charged hammer, as shown in Figure 7, the homopolarity of this charged hammer adjacent type absorbing ring is made up of parts such as aluminium ring shape pipeline 51, forward solenoid 52, reverse solenoid 53, irony magnetic conduction cap 54, dividing plate 55, electric shock hammer 56 and electric magnet 57.Wherein, described forward solenoid 52 and reverse solenoid 53 are respectively arranged in aluminium ring shape pipeline 51 and by ECU10 control, and both are connected with electric current in opposite direction so that forward solenoid 52 and reverse solenoid 53 adjacent produce like pole.Described irony magnetic conduction cap 54 is arranged on the inwall of aluminium ring shape pipeline 51, and it is positioned at forward solenoid 52 and reverse solenoid 53 adjacent and forward solenoid 52 and the intermediate point of reverse solenoid 53 axis.Described electric shock hammer 56 and electric magnet 57 are between dividing plate 55.Described electric magnet 57 connects and can promote electric shock hammer 56, makes electric shock hammer 56 percussion aluminium ring shape pipeline 52 inwall.Described ECU10 is electrically connected with and controls forward solenoid 52, reverse solenoid 53 and electric magnet 57.
The design principle of the homopolarity adjacent type absorbing ring of described charged hammer is as follows: have the energization solenoid of multiple ribbon core inside absorbing ring, adjacent solenoid coil is connected with electric current in opposite direction so that forward solenoid and reverse solenoid adjacent produce like pole.Simultaneously, irony magnetic conduction cap it is provided with at the absorbing ring inwall of forward solenoid and reverse solenoid adjacent and forward solenoid and reverse solenoid axis intermediate point, parallel with absorbing ring axis in strip, the shell of absorbing ring is paramagnetism aluminum matter outer tube wall, this set is conducive to improving magnetic circuit, strengthen the magnetic field intensity at absorbing ring inwall, strengthen the capture absorbability to granule.Each solenoid current is directly controlled by ECU, can be different with concentration and change, to obtain optimal adsorption performance according to the size of granule.Being additionally provided with by the electric hammer of magnet control between adjoining solenoids, two ends are isolated by dividing plate and solenoid magnet.What this electric shock was hammered into shape is provided for preventing granule bulk deposition at irony magnetic conduction cap, affects adsorption effect.Now, the inwall of absorbing ring is tapped by magnet control electric hammer so that adsorbed granule scatter to both sides.Meanwhile, when cleaning absorbing ring, the percussion of electric shock hammer can also improve cleaning performance.After having adsorbed, the inwall of absorbing ring is tapped by magnet control electric hammer, the granule being adsorbed is scatter to both sides, ECU controls electric magnet power-off subsequently, paramagnetism aluminum matter pipeline loses magnetism, and is attached to magnetic polymeric bulky grain on inner-walls of duct and enters adjacent capacitor particulate matter monitoring module with fluid along tube wall.
Refer to Figure of description 8-1 to shown in accompanying drawing 8-4, wear particle situation in described adjacent capacitor particulate matter monitoring module 6 on-line monitoring fluid pressure line.Described adjacent capacitor particulate matter monitoring module 6 is made up of lucite inwall 61, ground shield 62, reception pole plate 63, excitation several parts such as pole plate 64 and outer wall 65.Wherein, described machine glass inner wall 61, ground shield 62 and outer wall 65 in tubular construction, and successively from-inner-to-outer arrange.
The thickness of described machine glass inner wall 61 is 0.5mm, and dielectric constant is the dielectric constant about about 2.1 of 2.5(hydraulic oil), and the dielectric constant of hydraulic oil is close, therefore edge capacitance is fixed value；When lucite inner wall surface piles with magnetization polymeric macroparticle, magnetization polymeric macroparticle, hydraulic oil form mixed dielectric with lucite inwall, sensors edges electric capacity is acted on jointly, the dielectric constant of magnetization polymeric macroparticle is typically larger than 10, it is the several times of the dielectric constant of hydraulic oil and lucite inwall, enough cause the significant change of capacitance sensor edge capacitance, therefore may utilize the change of adjacent capacitive sensors capacitance, thus the anti-minor variations pushing away fluid dielectric constant, and then realize the enforcement to wear particle and monitor.
Adjacent capacitive sensors performance based on electric capacity edge effect depends primarily on penetration depth (penetration depth of electric field line), signal intensity (size of capacitance) and noise suppressed, measurement sensitivity (to change in voltage or the sensitivity of electric field change) and the measurement dynamic range of sensor.The capacitance that existing adjacent capacitive sensors measurement obtains is the faintest, and usually pF level is the least, the most worse to the measurement effect of the medium of the low-ks such as metal particle, therefore promotes sensor output signal strength particularly critical.Meanwhile, signal intensity and penetration depth two indices are conflicting, and this is also that this sensor performance promotes difficult point.
Adjacent capacitive sensors signal intensity and sensor plate area, the distance between polar plate spacing, and sensor and object under test, the dielectric constant of determinand suffers from the biggest relation.Assemble in lucite inner wall surface through magnetization polymerization, centrifugal and adsorption treatment wear particle, the increase of amounts of particles causes the increase of fluid dielectric constant, the particle diameter that aggregation of particles brings increases the increase also making fluid dielectric constant, magnetize simultaneously and also have the function increasing dielectric constant, three acts on simultaneously, has been greatly reinforced signal intensity；And owing to granule is close to organic glass inner wall surface, penetration depth is required almost nil, also solves index collision problem.
Owing to adjacent capacitive sensors output signal strength is the faintest, noise is notable on the impact of measurement result.Generally noise is mainly derived from two aspects, the noise of sensor self and environment noise.Devising ground shield for this to reduce sensor self-noise, the dielectric constant of ground shield 62 is 1.5-2.5, and shielding thickness is preferred, to ensure to measure sensitivity between being 1 to 2 times of adjacent capacitive sensors outer wall 65 thickness.
Described reception pole plate 63, excitation pole plate 64 are embedded in ground shield 62, and are positioned at outside machine glass inner wall 61, form gap magnetic field 66 between the two, are used for detecting aggregated particles 67.Described reception pole plate 63, excitation pole plate 64 all use efficient frontier length and baroque Peano curve structure pole plate layer.In this Peano curve structure pole plate layer, excitation pole plate 63, the curve of reception pole plate 64 composition can travel through all of point in square pole plate layer, obtain a curve being full of whole square pole plate sheaf space.In the case of pole plate aspect is long-pending fixing, this structure has the longest efficient frontier, maximum polar plate area and labyrinth, adds effective polar plate area and pole plate edge, adds sensors edges capacitance, reduce the requirement to external interface circuit sensitivity.Thus can obtain optimum signal intensity, sensor excitation pole plate uses curved edge to it also avoid high sensitivity and the unstability of pole plate corner with receiving pole plate.Further, described reception pole plate 63, excitation pole plate 64 are provided with sealing coat 69 between the two；0.8-1 times that width is lucite inner wall thickness of described sealing coat 69, it effectively can will receive pole plate 63, encourage pole plate 64 to isolate.
One end of described demagnetization module 7 is provided with fluid outlet 9, and it is made up of remanent magnetism sensor and demagnetizer.Due to the existence of hysteresis, after ferromagnetic material is magnetized into saturation, even if cancelling externally-applied magnetic field, the magnetic induction in material still returns less than zero point, needs externally-applied magnetic field demagnetization.In order to prevent magnetic microparticles from entering hydraulic circuit, sensitive to pollution Hydraulic Elements cause damage, and described demagnetization module 7 controls the demagnetization intensity of demagnetizer according to the detected value of demagnetizer exit remanent magnetism sensor.The demagnetization method herein used is electromagnetism demagnetization, and method is the opposing magnetic field by add suitable so that the magnetic induction in material comes back to zero point, and magnetic field intensity or electric current must invert in order and gradually reduce.
Referring to shown in Figure of description 9, described wear particle on-Line Monitor Device farther includes described ECU10, the PIC16F877 of its optional Microchip company.Described remanent magnetism sensor, demagnetizer, heater, cooler, temperature sensor, magnetizing current output module 25, rotating excitation field are centrifuged module 4, adsorption module 5, adjacent capacitor particulate matter monitoring module 6 are all electrically connected on ECU, and by ECU control.
Wear particle in using above-mentioned wear particle on-line monitoring equipment to have hydraulic pressure is monitored and is included following method:
1), the fluid in fluid pressure line carries wear particle and passes through temperature control module, controls oil liquid temperature by temperature control module constant at 42 DEG C；
2), magnetized module 2 is force-magnetized by the wear particle that carries in fluid, makes micron-sized wear particle aggregate into bulky grain；
3), magnetization aggregated particles is centrifuged in rotating excitation field module 4, makes particle aggregation at near-wall；
4), adsorption module 5 adsorbs the magnetization big microgranule of polymerization being gathered in near-wall after rotated magnetic field module 4 is centrifuged；
5), by wear particle situation in adjacent capacitor particulate matter monitoring module 6 on-line monitoring fluid pressure line；
6), demagnetization module 7 gives magnetized particles demagnetization, prevents magnetic microparticles from entering hydraulic circuit, and sensitive to pollution Hydraulic Elements cause damage.
Above detailed description of the invention is only the preferred embodiment of this creation, and not in order to limit this creation, all any modification, equivalent substitution and improvement etc. done within this spirit created and principle, within should be included in the protection domain of this creation.
Claims (8)
1. a, absorption centrifugal by rotating excitation field and the wear particle monitoring method of adjacent capacitor, it is characterized in that: it uses a kind of wear particle monitoring device, and this equipment includes that temperature control module, magnetized module, rotating excitation field are centrifuged module, adsorption module, adjacent capacitor particulate matter monitoring module and demagnetization module；Wherein, described temperature control module, magnetized module, rotating excitation field are centrifuged module, adsorption module, adjacent capacitor particulate matter monitoring module and demagnetization module and are sequentially connected with；One end of described temperature control module is provided with fluid entrance；One end of described demagnetization module is provided with fluid outlet, and it is made up of remanent magnetism sensor and demagnetizer；It comprises the steps:
1), the fluid in fluid pressure line carries wear particle and passes through temperature control module, controls oil liquid temperature by temperature control module constant at 42 DEG C；
2), magnetized module is force-magnetized by the wear particle that carries in fluid, makes micron-sized wear particle aggregate into bulky grain；
3), magnetization aggregated particles is centrifuged in rotating excitation field module, makes particle aggregation at near-wall；
4), adsorption module adsorbs the magnetization big microgranule of polymerization being gathered in near-wall after rotated magnetic field module is centrifuged；
5), by wear particle situation in adjacent capacitor particulate matter monitoring module online monitoring fluid pressure line；
6), demagnetization module is to magnetized particles demagnetization.
2. it is centrifuged by rotating excitation field, adsorbs and the wear particle monitoring method of adjacent capacitor as claimed in claim 1, it is characterised in that: described temperature control module includes heater, cooler and temperature sensor；Described heater uses the lubricating oil heater of the Chongqing gold letter of band temperature detection；Remover for surface evaporation type air cooling selected by described cooler, and the finned tube of cooler selects KLM type finned tube；Temperature sensor uses platinum resistance temperature sensor.
3. it is centrifuged by rotating excitation field, adsorbs and the wear particle monitoring method of adjacent capacitor as claimed in claim 1, it is characterised in that: described magnetized module includes aluminum matter pipeline, some windings, iron shell, flange and some magnetizing current output modules；Wherein, described some windings are rotating around outside aluminum matter pipeline, and each winding is made up of positive winding and inverse winding, and the size of current in positive winding and inverse winding is equal；Described iron shell is coated on aluminum matter pipeline；Described flange welding is at the two ends of aluminum matter pipeline；Each magnetizing current output module is connected to a winding.
4. it is centrifuged by rotating excitation field, adsorbs and the wear particle monitoring method of adjacent capacitor as claimed in claim 1, it is characterised in that: described rotating excitation field is centrifuged module and includes aluminum matter pipeline, iron shell, three-phase symmetric winding, flange and three-phase symmetrical current module；Described three-phase symmetric winding is wound on outside aluminum matter pipeline；Described iron shell is coated on aluminum matter pipeline；Described flange welding is at the two ends of aluminum matter pipeline；Described three-phase symmetrical current module connects described three-phase symmetric winding.
5. it is centrifuged by rotating excitation field, adsorbs and the wear particle monitoring method of adjacent capacitor as claimed in claim 4, it is characterised in that: described adsorption module uses homopolarity adjacent type absorbing ring；Described homopolarity adjacent type absorbing ring includes aluminium ring shape pipeline, forward solenoid, reverse solenoid and irony magnetic conduction cap；Described forward solenoid and reverse solenoid are respectively arranged in aluminium ring shape pipeline, and both are connected with electric current in opposite direction so that forward solenoid and reverse solenoid adjacent produce like pole；Described irony magnetic conduction cap is arranged on the inwall of aluminium ring shape pipeline, and it is positioned at forward solenoid and reverse solenoid adjacent and forward solenoid and the intermediate point of reverse solenoid axis.
6. it is centrifuged by rotating excitation field, adsorbs and the wear particle monitoring method of adjacent capacitor as claimed in claim 4, it is characterised in that: described adsorption module uses the homopolarity adjacent type absorbing ring of charged hammer；The homopolarity adjacent type absorbing ring of described charged hammer includes aluminium ring shape pipeline, forward solenoid, reverse solenoid, irony magnetic conduction cap, dividing plate, electric shock hammer and electric magnet；Described forward solenoid and reverse solenoid are respectively arranged in aluminium ring shape pipeline, and both are connected with electric current in opposite direction so that forward solenoid and reverse solenoid adjacent produce like pole；Described irony magnetic conduction cap is arranged on the inwall of aluminium ring shape pipeline, and it is positioned at forward solenoid and reverse solenoid adjacent and forward solenoid and the intermediate point of reverse solenoid axis；Described dividing plate is between forward solenoid and reverse solenoid；Described electric shock hammer and electric magnet are between dividing plate；Described electric magnet connects and can promote electric shock hammer, makes electric shock hammer tap aluminium ring shape inner-walls of duct.
7. it is centrifuged by rotating excitation field, adsorbs and the wear particle monitoring method of adjacent capacitor as claimed in claim 1, it is characterised in that: described adjacent capacitor particle monitoring device includes organic glass inner wall, ground shield, reception pole plate, excitation pole plate and outer wall；Wherein, described machine glass inner wall, ground shield and outer wall in tubular construction, and successively from-inner-to-outer arrange；The thickness of described machine glass inner wall is 0.5mm, and dielectric constant is 2.5；The dielectric constant of described ground shield is 1.5-2.5, and thickness is 1 to 2 times of outer wall thickness；Described reception pole plate, excitation pole plate are embedded in ground shield, and are positioned at outside machine glass inner wall；Described reception pole plate, excitation pole plate all use Peano curve structure pole plate layer, are provided with sealing coat between the two；The width of described sealing coat is 0.8-1 times of lucite inner wall thickness.
8. it is centrifuged by rotating excitation field, adsorbs and the wear particle monitoring method of adjacent capacitor as claimed in claim 1, it is characterized in that: it farther includes an ECU, described remanent magnetism sensor, demagnetizer, heater, cooler, temperature sensor, magnetizing current output module, rotating excitation field are centrifuged module, adsorption module and adjacent capacitor particulate matter monitoring module and are all electrically connected on ECU.
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| CN201610311702.0A CN105889181A (en) | 2016-05-12 | 2016-05-12 | Monitoring method adopting rotating magnetic-filed centrifuging, adsorbing and proximity capacitance for wear particles |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610311702.0A CN105889181A (en) | 2016-05-12 | 2016-05-12 | Monitoring method adopting rotating magnetic-filed centrifuging, adsorbing and proximity capacitance for wear particles |
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Application publication date: 20160824 |