CN105865987A - Method for monitoring oil by means of full-frequency-band variable-structure filtering, adsorbing and molding - Google Patents

Abstract

The invention relates to a method for monitoring oil by means of full-frequency-band variable-structure filtering, adsorbing and molding. Oil pressure and flow fluctuation suppression technologies and particle time-shared release measures are introduced into the method, so that the detection effectiveness and consistency can be guaranteed, and the method is implemented by the aid of full-frequency-band variable-structure filters; ferromagnetic particles and non-ferromagnetic particles can be separated from one another by the aid of mechanical centrifugal, magnetization adsorption, electrification adsorption technologies and the like, and accordingly influence on detection results due to mutual interference of the ferromagnetic particles and the non-ferromagnetic particles can be prevented; the sizes of the particles can be increased by means of particle aggregation and rotary magnetic field molding, the morphology of the particles can be changed, and accordingly the detection sensitivity can be improved; the structures of solenoid coils are improved, the axial uniformity of the internal magnetic induction intensity of solenoids is adjusted, and accordingly detection errors can be reduced; detection coils and reference coils are designed by the aid of sensors, difference values of the detection coils and the reference coils are outputted, and accordingly the shortcoming of zero errors of circuits can be overcome. The method in non-contact measurement modes has the various advantages of good signal consistency, high reliability, strong detection signals, few errors and the like.

Description

A kind of use the filtering of full frequency band structure changes, absorption and moulding Oil Monitoring method

[technical field]

The present invention relates to a kind of fluid on-line monitoring method, be specifically related to a kind of employing full frequency band structure changes filtering, absorption Oil Monitoring method with moulding, belongs to technical field of hydraulic equipment.

[background technology]

In the failure mode of machine parts, the inefficacy that abrasion causes accounts for more than 70%.Metallic wear particles implies machine Tool equipment running state information, can reflect abrasion present situation and the trend of equipment, is also diagnostic device fault simultaneously, is predicted dimension Repair, equipment improved the important evidence of design.Therefore, the metallic wear particles in fluid is carried out on-line monitoring to become The diagnosis of hydraulic system clamping jam faults and the important means of anticipation.

Utilize coil inductance change can detect ferromagnetics granule and diamagnetism granule in fluid, can determine that wear particle simultaneously Quality analysis, distribution of sizes, total quantity, can conveniently realize non-intruding on-line monitoring.Chinese invention patent No. 201210167540.X discloses a kind of online oil particle sensor measured based on inductance value, when the metal in fluid grinds When damage granule flows through test coil so that test winding inductance quantity becomes big, and high-frequency test circuit oscillation frequency diminishes, oscillation circuit Electric current becomes big, and after metal wear particles flows through, high-frequency test part comes back to original fixed ampllitude oscillatory regime, and then acquisition Grain quantity, particle size distribution produce speed with granule, it is achieved granule on-line monitoring in oil.

But, there is the deficiency of following several respects in this monitoring method:

1. the magnetic fluctuation that metallic wear particles causes when flowing through test coil is the faintest, the output result of detection coil Affected relatively big by microgranule Negotiation speed, in pipeline, pressure and the flowed fluctuation of fluid will have a strong impact on having of inductance method detection of particulates Effect property and concordance.

2. the galling abrasive particle in machine oil can be divided into ferromagnetics microgranule (such as ferrum) and non-according to its electromagnetic property Ferromagnetics microgranule (such as copper, aluminum).Ferromagnetics microgranule strengthens the equivalent inductance of cell winding, and non-ferromagnetic material microgranule then weakens biography The equivalent inductance of sensor coil.When two kinds of microgranules are simultaneously by detection coil, this monitoring device will lose efficacy.

The particle diameter of metallic wear particles is less the most under normal circumstances, at about 5um, and predominantly ball milling grain, its fiber number is little In other abrasive particles, cell winding is relatively weak to its power of test.Such as patent documentation 1, can only to process the metal of about 10um micro- Grain, it is impossible to the premature wear of monitoring parts.

4. the magnetic induction density B in solenoid is non-uniform Distribution along its axis direction, and this will cause serious measurement by mistake Difference；The inductance of the most same model is greater than the power of test to copper granule to the power of test of Ferrous particles, and this equally can Bring measurement error.

Therefore, for solving above-mentioned technical problem, the employing full frequency band structure changes filtering of a kind of innovation of necessary offer, suction Echo moulding Oil Monitoring method, 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 a kind of employing non-contacting metering system, signal Concordance is good, reliability is high, detection signal is strong and error is little the use filtering of full frequency band structure changes, absorption and moulding fluid are supervised Prosecutor method.

For achieving the above object, the technical scheme that the present invention takes is: a kind of use the filtering of full frequency band structure changes, absorption and Moulding Oil Monitoring method, it uses a kind of monitoring device, and this equipment is arranged on fluid pressure line, including wave filter, separation Adsorption module, rotate moulding module, detection coil, reference coil, demagnetization module, flow transducer and ECU；Wherein, described Wave filter, separate adsorption module, rotate moulding module, detection coil, flow transducer, demagnetization module are successively set on hydraulic tube Lu Shang；Described detection coil, reference coil are in series；Described ECU is electrically connected with and controls wave filter, separates absorption mould Block, rotate moulding module, detection coil, reference coil, demagnetization module and flow transducer；Described wave filter include input pipe, Shell, outlet tube, S type elastic thin-wall, H mode filter and cascaded H mode filter；Wherein, described input pipe is connected to shell One end, itself and one hydraulic oil inlet docking；Described outlet tube is connected to the other end of shell, itself and U-shaped separation of particles module Docking；Described S type elastic thin-wall is installed in shell along the radial direction of shell, forms expansion chamber and contraction chamber in it；Described input Pipe, outlet tube and S type elastic thin-wall are collectively forming a S type cavity volume wave filter；Uniformly have in the axial direction of described S type elastic thin-wall Some taper structure changes damping holes；Described taper structure changes damping hole is made up of cone shaped elastic damping hole pipe and slot apertures；Described S type Resonance series cavity volume I and parallel resonance cavity volume is formed between elastic thin-wall and shell；The outside of described resonance series cavity volume I sets One resonance series cavity volume II, inserts pipe by a taper between described resonance series cavity volume I and resonance series cavity volume II and connects；Institute Stating H mode filter and be positioned at parallel resonance cavity volume, it is connected with taper structure changes damping hole；Described cascaded H mode filter position In resonance series cavity volume I and resonance series cavity volume II, it is also connected with taper structure changes damping hole；Described H mode filter Axially it is symmetrical set with cascaded H mode filter, and forms connection in series-parallel H mode filter；Described separation adsorption module is by connecting successively Mechanical centrifugal module, magnetized module, magnetic suck module, electrification module and the electric adsorption module composition connect；It includes walking as follows Rapid:

1), the fluid in fluid pressure line passes through wave filter, the arteries and veins of the high, medium and low frequency range in filter attenuation hydraulic system Dynamic pressure, and suppression flowed fluctuation；

2), fluid enters the mechanical centrifugal module separating adsorption module afterwards, makes the wear particle polymerization in fluid the most real Existing initial centrifugation, the polymeric macroparticle making quality bigger gets rid of to near-wall；

3), make ferromagnetic metal polymeric macroparticle force-magnetized by magnetized module；

4), the magnetic suck module absorption big microgranule of magnetized metal polymerization；

5), fluid passes through electric ignitor, makes the non-ferromagnetic metal wear particle charged polymeric in fluid；

6), fluid flows into electric adsorption module, electric adsorption module absorption non-ferromagnetic metal wear particle；

7), ECU first controls electric adsorption module by direction of an electric field the most reversely, then cancels electric field, makes non-ferromagnetic metal wear and tear Microgranule enters and rotates moulding module, recovers electric field afterwards；Meanwhile, ECU controls magnetic suck module and the power-off of electrification module, ferromagnetic Property granule enter rotate moulding module；Subsequently, magnetic suck module and the electrification original duty of module recovery；

8), charged nonferromagnetic microgranule and magnetized ferromagnetic particle successively enter and rotate moulding module, make in fluid The particle diameter of two kinds of metal particles increase simultaneously form and become elongated acicular texture so that the fiber number of metal particle increases Add；

9), two based fine particles enter detection coil in batches, and carry out monitoring particulate by the cooperation of detection line coil and a reference coil Type and quantity；

10), magnetic particle magnetic is eliminated by demagnetization module.

The present invention use full frequency band structure changes filtering, absorption and moulding Oil Monitoring method be further: described defeated Enter the axis of pipe and outlet tube the most on the same axis；The wider place of described taper structure changes damping hole opening is positioned at resonance series and holds In chamber I and parallel resonance cavity volume, its taper angle is 10 °；The Young of described taper structure changes damping hole cone shaped elastic damping hole pipe The Young's modulus of modular ratio elastic thin-wall wants big, can be with change in fluid pressure stretching or compression；The Young's modulus of slot apertures compares taper The Young's modulus of elastic damping hole pipe wants big, can be with fluid opened by pressure or closedown；Position, tube opening wider place is inserted in described taper In resonance series cavity volume II, its taper angle is 10 °.

The present invention use full frequency band structure changes filtering, absorption and moulding Oil Monitoring method be further: described machine Tool is centrifuged module and uses eddy flow to be centrifuged module；Described eddy flow is centrifuged module and includes eddy flow tube wall, the first flow deflector, the second water conservancy diversion Sheet, motor and flow transducer；Wherein, described first flow deflector is provided with 3, and these 3 first flow deflectors are along tube wall Circumference is uniformly distributed every 120 °, and its laying angle is set to 18 °；Described second flow deflector and the first flow deflector structure are identical, and it is arranged After the first flow deflector, and and the first flow deflector stagger 60 ° and be connected in tube wall, its laying angle is set to 36 DEG C；Described first leads The long limit of flow is connected with tube wall, and minor face extends along the axis of tube wall；Its leading edge frustrates into obtuse, and trailing edge is processed into wing, and it is high Degree is 0.4 times of tube wall diameter, 1.8 times of a length of tube wall diameter；Described motor connect and drive the first flow deflector and Second flow deflector, to regulate laying angle；Described flow transducer is arranged on the central authorities in tube wall.

The present invention use full frequency band structure changes filtering, absorption and moulding Oil Monitoring method be further: described magnetic Change module and include aluminum matter pipeline, some windings, iron shell and flange；Wherein, described some windings are rotating around at aluminum matter pipe Outside road；Described iron shell is coated on aluminum matter pipeline；Described flange welding is at the two ends of aluminum matter pipeline.

The present invention use full frequency band structure changes filtering, absorption and moulding Oil Monitoring method be further: described magnetic Adsorption module uses homopolarity adjacent type absorbing ring, and this homopolarity adjacent type absorbing ring includes aluminium ring shape pipeline, forward solenoid, anti- To solenoid and irony magnetic conduction cap；Described forward solenoid and reverse solenoid are respectively arranged in aluminium ring shape pipeline, and two Person is connected with electric current in opposite direction so that forward solenoid and reverse solenoid adjacent produce like pole；Described irony is led Magnetic cap is arranged on the inwall of aluminium ring shape pipeline, and it is positioned at forward solenoid and reverse solenoid adjacent and forward spiral shell Spool and the intermediate point of reverse solenoid axis.

The present invention use full frequency band structure changes filtering, absorption and moulding Oil Monitoring method be further: described magnetic Adsorption module uses the homopolarity adjacent type absorbing ring of charged hammer, and the homopolarity adjacent type absorbing ring of this 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 Being respectively arranged in aluminium ring shape pipeline with reverse solenoid, both are connected with electric current in opposite direction so that forward solenoid and Reverse solenoid adjacent produces 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 Between forward solenoid and reverse solenoid；Described electric shock hammer and electric magnet are between dividing plate；Described electric magnet connects And electric shock hammer can be promoted, make electric shock hammer tap aluminium ring shape inner-walls of duct.

The present invention use full frequency band structure changes filtering, absorption and moulding Oil Monitoring method be further: described Electricity module includes some electrodes and an electrode controller；Described some electrodes are installed on fluid pressure line, and it is respectively connecting to Electrode controller.

The present invention use full frequency band structure changes filtering, absorption and moulding Oil Monitoring method be further: described electricity Adsorption module includes aluminum matter pipeline, positive plate, minus plate and pole plate controller；Wherein, described positive plate, minus plate set respectively Put on aluminum matter pipeline, and in being oppositely arranged；Described positive plate, minus plate are respectively and electrically connected on pole plate controller；Described Pole plate controller is electrically connected to ECU, and by ECU control.

The present invention use full frequency band structure changes filtering, absorption and moulding Oil Monitoring method be further: described rotation Turn moulding module and include aluminum matter pipeline, some windings, iron shell, flange and the moulding current output module of some rotations；Its In, described some windings are rotating around outside aluminum matter pipeline；Described iron shell is coated on aluminum matter pipeline；Described flange welding exists The two ends of aluminum matter pipeline；The moulding current output module of each rotation is connected to a winding.

The present invention use full frequency band structure changes filtering, absorption and moulding Oil Monitoring method be also: described detection line The winding of circle is made up of positive winding and inverse winding, and each winding is connected to an exciting current output module, this exciting current output mould Block is controlled by ECU module.

Compared with prior art, there is advantages that present invention introduces oil liquid pressure flowed fluctuation suppresses Technology and microgranule timesharing release measure, to ensure effectiveness and the concordance of detection；By mechanical centrifugal, magnetization absorption, electrification The technology such as absorption by ferromagnetics microgranule and non-ferromagnetic material separation of particles, affect testing result preventing two kinds of microgranules from interfering with each other； By aggregation of particles and rotating excitation field moulding increase grain diameter and change its form, to improve the sensitivity of detection；By changing Enter the uniformity along its axis direction of the magnetic induction in solenoid coil structural adjustment solenoid, to reduce detection error； Sensor design is two loop construction detection line coil and a reference coil, is output as both differences, to overcome circuit zero-bit Error.

[accompanying drawing explanation]

Fig. 1 is employing full frequency band structure changes filtering, absorption and the overall structure of moulding Oil Monitoring equipment of the present invention Schematic diagram.

Fig. 2 is the structural representation of the wave filter in Fig. 1.

Fig. 3 is the profile in Fig. 2 along A-A.

Fig. 4 is H mode filter schematic diagram in Fig. 3.

Fig. 5 is cascaded H mode filter schematic diagram in Fig. 3.

Fig. 6 is H mode filter and cascaded H mode filter frequency characteristic constitutional diagram.Wherein, solid line is cascaded H mode filter Frequency characteristic.

Fig. 7 is connection in series-parallel H mode filter frequency characteristic figure.

Fig. 8 is the structural representation of S type cavity volume wave filter.

Fig. 9 is the cross sectional representation of S type elastic thin-wall.

Figure 10 is the schematic diagram of taper structure changes damping hole in Fig. 2.

Figure 10 (a) to Figure 10 (c) is the working state figure of taper structure changes damping hole.

Figure 11 is the connection diagram separating adsorption module in Fig. 1.

Figure 12-1 is the horizontal schematic diagram of the mechanical centrifugal module in Figure 11.

Figure 12-2 is the radial direction schematic diagram of the mechanical centrifugal module in Figure 11.

Figure 13 is the structural representation of the magnetized module in Figure 11.

Figure 14-1 be the magnetic suck module in Figure 11 be the structural representation of homopolarity adjacent type absorbing ring.

Figure 14-2 is the structural representation of the adjacent type absorbing ring of the homopolarity that magnetic suck module is charged hammer in Figure 11.

Figure 15 is the structural representation of the electrification module in Figure 11.

Figure 16 is the structural representation of the electric adsorption module in Figure 11.

Figure 17 is the structural representation rotating moulding module in Fig. 1.

Figure 18-1 is the structural representation of the winding of the detection coil in Fig. 1.

Figure 18-2 is the circuit diagram of the exciting current output module in Figure 18-1.

Figure 19 is the annexation figure of the ECU module in Fig. 1.

[detailed description of the invention]

Refer to shown in Figure of description 1 to accompanying drawing 19, the present invention be a kind of use the filtering of full frequency band structure changes, absorption and Moulding Oil Monitoring equipment, it is arranged on fluid pressure line 9, its by wave filter 8, separate adsorption module 2, rotate moulding module 3, several parts compositions such as coil 4, reference coil 5, demagnetization module 6, flow transducer 7 and ECU1 are detected.

Wherein, described wave filter 8, separate adsorption module 2, rotate moulding module 3, detection coil 4, flow transducer 7, disappear Magnetic module 6 is successively set on fluid pressure line 9.Described ECU1 be electrically connected with and control wave filter 8, separate adsorption module 2, Rotate moulding module 3, detection coil 4, reference coil 5, demagnetization module 6 and flow transducer 7.

Owing to the flow velocity of fluid is very big on detection characteristic impact, along with the increase of oil flow, the sensitivity of detection and Output voltage all will occur significant change；Meanwhile, the flow of fluid also has large effect to detection output, when flow increases Time, output voltage is as well as change, and this is very big, to this end, the present invention is in inspection to concordance and the availability influence of testing result Wave filter 8 stable hydraulic system pressure and flow is added before survey.

Described wave filter 8 by input pipe 81, shell 88, outlet tube 89, S type elastic thin-wall 87, H mode filter 812 and Several parts compositions such as cascaded H mode filter 813.

Wherein, described input pipe 81 is connected to one end of shell 89, is used for inputting fluid；Described outlet tube 811 is connected to The other end of shell 89, itself and separation adsorption module 2 dock.Described S type elastic thin-wall 87 is installed on shell along the radial direction of shell In 88, in it, form expansion chamber 71 and contraction chamber 72.The axis of described input pipe 81 and outlet tube 89 the most on the same axis, this Sample can improve the filter effect of more than 10%.

Described input pipe 81, outlet tube 89 and S type elastic thin-wall 87 are collectively forming a S type cavity volume wave filter, thus decay Hydraulic system high frequency pressure pulsations.The filter transmission coefficient obtained after processing by lumped-parameter method is:

$\mathrm{\γ}=\frac{1}{1+{(\frac{2\mathrm{\π}f}{Z}\·\frac{\frac{2}{3}{k}_1{D}^3+k_2{d}^{2}L}{{d_I}^2\·a})}^2}$

Velocity of sound L contraction chamber length D expansion chamber diameter Z characteristic impedance in a medium

γ transmission coefficient f pressure oscillation frequency d_IInput pipe diameter d contraction chamber diameter

k₁Expansion chamber coefficient k₂Contraction chamber coefficient

From above formula, S type cavity volume wave filter is similar with the electric capacity effect in circuit.The pressure pulse wave of different frequency leads to When crossing this wave filter, transmission coefficient is different with frequency.Frequency is the highest, then transmission coefficient is the least, and this shows the pressure arteries and veins of high frequency Dynamic ripple is decayed the most severe when device after filtering, thus serves the effect eliminating high frequency pressure pulsations.Meanwhile, the present invention In S type holding cavity structure, transitions smooth between expansion chamber and contraction chamber, contribute to reducing the system pressure that cavity diameter sudden change brings Loss.The input pipe of wave filter and outlet tube the most on the same axis, can improve the filter effect of more than 10%.

The design principle of described S type cavity volume wave filter is as follows: when the flow of change enters the swollen of S type cavity volume by input pipe During swollen chamber, liquid stream exceedes average discharge, and the expansion chamber of expansion can absorb unnecessary liquid stream, and releases liquid when less than average discharge Stream, thus absorption pressure pulsation energy.The combination of multiple expansion chamber and contraction chamber then improves the fluctuation pressure of wave filter and absorbs Ability, namely filtering performance.Use curved surface to smoothly transit between expansion chamber and contraction chamber, then avoid by fluid boundary sudden change band That comes loses along stroke pressure and heating.

Described S type elastic thin-wall 87 weakens hydraulic system medium-high frequency pressure fluctuation by being forced to mechanical vibration.By lump The S type elastic thin-wall natural frequency that parametric method obtains after processing is:

$f_m=\frac{k^{2}h}{2{\mathrm{\πR}}^2}\·\sqrt{\frac{E}{12\mathrm{\ρ}(1+\mathrm{\η})(1-{\mathrm{\μ}}^2)}}$

K S type elastic thin-walled structures coefficient h S type elastic thin-wall thickness R S type elastic thin-wall radius

The mass density of the Young's modulus ρ S type elastic thin-wall of E S type elastic thin-wall

The Poisson's ratio of the current-carrying factor mu S type elastic thin-wall of η S type elastic thin-wall.

Substitute into actual parameter, above formula is carried out simulation analysis it is found that S type elastic thin-wall 87 natural frequency generally than The natural frequency of H mode filter is high, and its attenuation band is also wide than H mode filter.In relatively wide frequency band range, S Type elastic thin-wall has good attenuating to pressure fluctuation.Meanwhile, the S type elastic thin-wall in the filter construction of the present invention Radius is bigger and relatively thin, and its natural frequency, closer to Mid Frequency, can realize having the medium-high frequency pressure fluctuation in hydraulic system Effect decay.

The design principle of described S type elastic thin-wall 87 is as follows: when producing intermediate frequency pressure fluctuation in pipeline, S type cavity volume is to pressure The damping capacity of fluctuation is more weak, flows into the periodically pulsing pressure continuous action of wave filter S type cavity volume at S type elastic thin-wall 87 Inside and outside wall on, owing to having between inside and outside wall, pillar is fixing to be connected, and inside and outside elastic thin-wall does week by the frequency of fluctuation pressure simultaneously Phase property is vibrated, and this forced vibration consumes the pressure fluctuation energy of fluid, thus realizes the filtering of Mid Frequency pressure.By the principle of virtual work Understanding, elastic thin-wall consumes ability and potential energy during its forced vibration and the direct phase of kinetic energy sum of fluid pulsation pressure energy Closing, in order to improve Mid Frequency filtering performance, the radial design of elastic thin-wall is much larger than pipe radius, and the thickness of thin-walled is relatively Little, representative value is less than 0.1mm.

Further, resonance series cavity volume I84 and parallel resonance are formed between described S type elastic thin-wall 87 and shell 88 Cavity volume 85.The outside of described resonance series cavity volume I84 sets a resonance series cavity volume II83, described resonance series cavity volume I84 and string Allying the communists shakes is connected by a taper insertion pipe 82 between cavity volume II83, and described taper is inserted the wider place of pipe 82 opening and is positioned at series connection altogether Shaking in cavity volume II83, its taper angle is 10 °.The resistance of some taper structure changes is uniformly had in the axial direction of described S type elastic thin-wall 87 Buddhist nun hole 86.

Described H mode filter 812 is positioned at parallel resonance cavity volume 85, and it is connected with taper structure changes damping hole 86.Institute State the wider place of taper structure changes damping hole 86 opening and be positioned at resonance series cavity volume I84 and parallel resonance cavity volume 85, its taper angle It it is 10 °.The wave filter natural angular frequency obtained after processing by lumped-parameter method is:

$\begin{array}{cc}\mathrm{\ω}=\frac{a\·D_1}{D_2}\sqrt{\frac{1}{L_1{L}_2}}& (rad/s)\end{array}$

Velocity of sound L in a medium₁The long D of damping hole₁Damping hole diameter

L₂Parallel resonance cavity volume height D₂Parallel resonance cavity volume diameter.

Described cascaded H mode filter 813 is positioned at resonance series cavity volume I84 and resonance series cavity volume II83, and it also and is bored Deformation structure damping hole 86 is connected.After processing by lumped-parameter method, two natural angular frequencies of cascaded H mode filter 813 are:

${\mathrm{\ω}}_1=\frac{\sqrt{\mathrm{\π}}a}{\sqrt{2}\sqrt{{\frac{{\mathrm{\πl}}_1({d_2}^2{l}_2+{d_4}^2{l}_4)}{4{d_1}^2}}_1+\frac{{{\mathrm{\πd}}_4}^2{l}_4{l}_3}{4{d_3}^2}+\sqrt{{\[{\frac{{\mathrm{\πl}}_1({d_2}^2{l}_2+{d_4}^2{l}_4)}{4{d_1}^2}}_1-\frac{{{\mathrm{\πd}}_4}^2{l}_4{l}_3}{4{d_3}^2}\]}^2+\frac{{\mathrm{\π}}^2{d_4}^4{l_4}^2{l}_1{l}_3}{4d_1^2{d}_3^2}}}}$

${\mathrm{\ω}}_2=\frac{\sqrt{\mathrm{\π}}a}{\sqrt{2}\sqrt{{\frac{{\mathrm{\πl}}_1({d_2}^2{l}_2+{d_4}^2{l}_4)}{4{d_1}^2}}_1+\frac{{{\mathrm{\πd}}_4}^2{l}_4{l}_3}{4{d_3}^2}-\sqrt{{\[{\frac{{\mathrm{\πl}}_1({d_2}^2{l}_2+{d_4}^2{l}_4)}{4{d_1}^2}}_1-\frac{{{\mathrm{\πd}}_4}^2{l}_4{l}_3}{4{d_3}^2}\]}^2+\frac{{\mathrm{\π}}^2{d_4}^4{l_4}^2{l}_1{l}_3}{4d_1^2{d}_3^2}}}}$

Velocity of sound l in a medium₁The long d of damping hole₁Damping hole diameter l₃Resonance pipe range

d₃Resonantron diameter l₂Resonance series cavity volume 1 height d₂Resonance series cavity volume 1 diameter

l₄Resonance series cavity volume 2 height d₄Resonance series cavity volume 2 diameter.

Described H mode filter 812 and cascaded H mode filter 813 are axially symmetrical set, and form the filtering of connection in series-parallel H type Device, for broadening frequency filtering scope and make overall structure more compact.The multiple connection in series-parallel H types of the present invention circumferentially interface distributions Wave filter (only depicts 2) in figure, separate with dividing plate 820 each other, and the resonance bands of these multiple wave filter is different, Whole medium and low frequency filtering frequency range can be covered, it is achieved the entire spectrum filtering of medium and low frequency section after combining comprehensively.

All can be found by Fig. 6 H mode filter and cascaded H mode filter frequency characteristic and formula, cascaded H mode filter has 2 Individual natural angular frequency, at crest, filter effect is preferable, does not the most substantially have filter effect at trough；H mode filter has 1 Natural angular frequency, at crest, filter effect is preferable equally, does not the most substantially have filter effect at trough；Select suitably filter Ripple device parameter, makes the natural angular frequency of H mode filter just fall between 2 natural angular frequencies of cascaded H mode filter, such as figure Shown in 7, in certain frequency range, both defined the natural reonant frequency peak value of 3 next-door neighbours, in this frequency range, no matter The fluctuating frequency of pressure is at crest or all can guarantee that preferable filter effect at trough.Multiple connection in series-parallel H mode filter structures The bank of filters become both can cover whole medium and low frequency section, it is achieved the entire spectrum filtering of medium and low frequency section.

Further, described taper structure changes damping hole 86 is made up of cone shaped elastic damping hole pipe 16 and slot apertures 15, taper Narrow end is opened on elastic thin-wall 7.Wherein the Young's modulus of cone shaped elastic damping hole pipe 16 is wanted than the Young's modulus of elastic thin-wall 7 Greatly, can be with change in fluid pressure stretching or compression；The Young's modulus of slot apertures 15 is than the Young's modulus of cone shaped elastic damping hole pipe 16 Want big, can be with fluid opened by pressure or closedown.Therefore when the fluctuating frequency of pressure falls at high band, c-type cavity volume filter construction rises Filter action, cone shaped elastic damping hole pipe 16 and slot apertures 15 are all in Figure 10 (a) state；And when ripple frequency falls at Mid Frequency Time, filter construction becomes c-type cavity volume filter construction and elastic thin-wall 7 filter structure concurs, and cone shaped elastic damps Hole pipe 16 and slot apertures 15 are all in Figure 10 (a) state；When ripple frequency falls at some specific Frequency, filter construction Become plug-in type connection in series-parallel H mode filter, c-type cavity volume filter construction and elastic thin-wall filter structure to concur, taper Elastic damping hole pipe 16 and slot apertures 15 are all in Figure 10 (b) state, due to the natural frequency quilt of plug-in type connection in series-parallel H mode filter It is designed as consistent with these particular low frequency ripple frequencies, the system that fundamental frequency energy is big can be played preferable filter effect；Work as arteries and veins Dynamic frequency fall the low-frequency range beyond some characteristic frequency time, cone shaped elastic damping hole pipe 16 and slot apertures 15 are all in Figure 10 (c) State.The design of such structure changes wave filter both ensure that the full frequency band full working scope filtering of hydraulic system, reduces again normal work The pressure loss of wave filter under condition, it is ensured that the hydraulic pressure rigidity of system.

The present invention can also the pulsation decay of solid line operating mode self-adaptive pressure.When hydraulic system working conditions change, both executive components Suddenly stop or running, and when the opening of valve changes, the characteristic impedance of pipe-line system can be caused to undergo mutation, so that former pipe Pressure curve with change in location in time in road changes the most therewith, then the position of pressure peak also changes.Due to the present invention The axial length of wave filter be designed as pulsing wavelength, and the connection in series-parallel H mode filter group of wave filter more than system main pressure Cavity volume length, the length of S type cavity volume wave filter and the length of elastic thin-wall and wave filter axial length equal, it is ensured that pressure Peak is constantly in the effective range of wave filter；And the taper structure changes damping hole of connection in series-parallel H mode filter is opened On elastic thin-wall, be uniformly distributed in the axial direction so that pressure peak change in location to the performance of wave filter almost without shadow Ring, it is achieved thereby that operating mode adaptive-filtering function.Suitable in view of three kinds of filter structure axial dimensions and wave filter, this is relatively Big size also ensure that hydraulic filter possesses stronger pressure fluctuation damping capacity.

The method that the hydraulic filter using the present invention carries out hydraulic pulsation filtering is as follows:

1), hydraulic fluid enters S type cavity volume wave filter by input pipe, and the cavity volume of expansion absorbs unnecessary liquid stream, completes height The filtering of pressure fluctuation frequently；

2), by S type elastic thin-wall 87 forced vibration, consume the pressure fluctuation energy of fluid, complete intermediate frequency pressure fluctuation Filtering；

3), by connection in series-parallel H mode filter group, and taper structure changes damping hole, taper insertion pipe and fluid produce altogether Shake, consume pulsation energy, complete the filtering of low frequency pulsation；

4), the axial length of wave filter is designed as more than hydraulic system main pressure pulsation wavelength, and the filter of connection in series-parallel H type Ripple device length, S type cavity volume filter length and S type elastic thin-wall 87 length are equal with filter length, make pressure peak position It is constantly in the effective range of wave filter, it is achieved the filtering of pressure fluctuation when system condition changes；

5), by the flexible of the cone shaped elastic damping hole pipe of taper structure changes damping hole and the switch of slot apertures, pressure is completed Pulsation adaptive-filtering.

Galling abrasive particle in machine oil can be divided into ferromagnetics microgranule (such as ferrum) and non-ferric according to its electromagnetic property Magnetic substance microgranule (such as copper, aluminum).Ferromagnetics microgranule strengthens the equivalent inductance of cell winding, and non-ferromagnetic material microgranule then weakens sensing The equivalent inductance of device coil.When two kinds of microgranules are simultaneously by detection coil, this monitoring device will lose efficacy.To this end, the present invention uses Separate adsorption module 2 and separate both microgranules.Described separation adsorption module 2 is by the mechanical centrifugal module 21 being sequentially connected with, magnetic Change module 22, magnetic suck module 23, electrification module 24 and electric adsorption module 25 to form.

Wherein, described mechanical centrifugal module 21 makes fluid under the action of the centrifugal, and the solid particle that quality is bigger is thrown toward chamber Wall, it uses the mode of energy loss, and its design principle is as follows: arrange the water conservancy diversion of the distortion of certain altitude and length in the duct Sheet, and make blade face tangent line angled with axis, fluid can be made to produce spiral flow in pipes, this spiral shell because pipe flow border changes Eddy flow can be analyzed to the circumferential flow around pipe axle and axial straight flowing, and the particulate matter carried in fluid produces off-axis alignment heart spiral shell Rotation motion.This eddy flow centrifugal device 21 is by eddy flow tube wall the 211, first flow deflector the 212, second flow deflector 213, motor 214 And several parts such as flow transducer 215 composition, described motor 214 and flow transducer 215 are electrically connected to ECU1.

Wherein, described first flow deflector 212 is provided with 3, these 3 first flow deflectors 212 along tube wall 211 inner periphery every 120 ° Being uniformly distributed, its laying angle (angle between the first flow deflector 212 and eddy flow tube wall 211) is set to 18 °, optimal tangential to ensure Flowing.Described second flow deflector 213 is identical with the first flow deflector 212 structure, after it is arranged on the first flow deflector 212, and and the One flow deflector 212 staggers 60 ° and is connected in tube wall 211, and its laying angle is set to 36 DEG C, is used for reducing resistance and strengthening circumferential flow Intensity.It addition, the 3rd or more flow deflector can be arranged the most again according to actual separation effect, laying angle gradually increases.Institute State motor 214 connect and drive the first flow deflector 212 and the second flow deflector 213, to regulate laying angle, thus can obtain more Good centrifugal effect, knows and makes flow deflector 212,213 adapt to different operating modes.Described flow transducer 215 is arranged on tube wall 211 Interior central authorities, the ECU1 numerical analysis cyclonic separation effect by reading flow quantity sensor 215, and control motor accordingly 214, motor 214 regulates the laying angle of each flow deflector 212,213, to obtain more separating effect.

Further, the long limit of described first flow deflector 212 is connected with tube wall 211, and minor face 213 is along the axis of tube wall 211 Extend；For reducing resistance, its leading edge frustrates into obtuse；For avoiding streaming, trailing edge is processed into wing；Its height is tube wall 211 diameter 0.4 times, make the spiral flow of formation have bigger intensity；1.8 times of a length of tube wall 211 diameter, bigger right to ensure The sphere of action of fluid.

Described magnetized module 22 is force-magnetized by the ferromagnetic metal wear particle that carries in fluid, and makes micron-sized Wear particle aggregates into bulky grain, can improve the output signal strength of sensor.Described magnetizing assembly 22 is by aluminum matter pipeline 221, some windings 222, iron shell 223 and flange 224 form.Wherein, described aluminum matter pipeline 221 makes fluid flow from which Cross and by magnetization treatment, and the pcrmeability of aluminum is the lowest, can make to obtain in pipeline 221 higher magnetic field intensity.

Described some windings 222, rotating around outside aluminum matter pipeline 221, are coated insulation by the copper wire of a diameter of about 1.0mm Paint is made.Described iron shell 223 is coated on aluminum matter pipeline 221, and the material of irony can mask most magnetic flux.Described Flange 224 is welded on the two ends of aluminum matter pipeline 221.

Described magnetic suck module 23 is polymerized big microgranule for adsorpting aggregation in the magnetization of near-wall, and it can use homopolarity phase Adjacent type absorbing ring.This homopolarity adjacent type absorbing ring by aluminium ring shape pipeline 231, forward solenoid 232, reverse solenoid 233 with And the parts such as irony magnetic conduction cap 234 composition.Wherein, described forward solenoid 232 and reverse solenoid 233 are respectively arranged in aluminum matter In circulating line 231 and by ECU1 control, both are connected with electric current in opposite direction so that forward solenoid 232 and reverse helical Pipe 233 adjacent produces like pole.Described irony magnetic conduction cap 234 is arranged on the inwall of aluminium ring shape pipeline 231, and it is positioned at Forward solenoid 232 and reverse solenoid 233 adjacent and forward solenoid 232 and the centre of reverse solenoid 233 axis Point.

The design principle of described homopolarity adjacent type absorbing ring is as follows: energising forward solenoid 232, reverse solenoid 233, phase Adjacent forward solenoid 232, reverse solenoid 233 are connected with electric current in opposite direction so that forward solenoid 232, reverse helical Pipe 233 adjacent produces like pole；Meanwhile, aluminium ring shape pipeline 231 can improve magnetic circuit, strengthens the magnetic field at inner-walls of duct Intensity, strengthens the irony magnetic conduction cap 234 capture absorbability to granule.Each forward solenoid 232, reverse solenoid 233 electric current Directly controlled by ECU1, can be different with concentration and change, to obtain optimal adsorption performance according to the size of granule.

Further, the homopolarity adjacent type absorbing ring that described magnetic suck module 23 may be used without charged hammer, this band shocks by electricity The homopolarity adjacent type absorbing ring of hammer is by aluminium ring shape pipeline 231, forward solenoid 232, reverse solenoid 233, irony magnetic conduction cap 234, dividing plate 235, the parts such as hammer 236 and electric magnet 237 that shock by electricity form.Wherein, described forward solenoid 232 and reverse helical Pipe 233 is respectively arranged in aluminium ring shape pipeline 231 and by ECU1 control, and both are connected with electric current in opposite direction so that forward Solenoid 232 and reverse solenoid 233 adjacent produce like pole.Described irony magnetic conduction cap 234 is arranged in aluminium ring shape pipe On the inwall in road 231, it is positioned at forward solenoid 232 and reverse solenoid 233 adjacent and forward solenoid 232 and anti- Intermediate point to solenoid 233 axis.Described electric shock hammer 236 and electric magnet 237 are between dividing plate 235.Described electric magnet 237 Connect and electric shock hammer 236 can be promoted, making electric shock hammer 236 percussion aluminium ring shape pipeline 232 inwall.Described ECU1 is electrically connected with and controls Forward solenoid 232 processed, reverse solenoid 233 and electric magnet 237.

The design principle of the homopolarity adjacent type absorbing ring of described charged hammer is as follows: energising forward solenoid 232, reverse spiral shell Spool 233, adjacent forward solenoid 232, reverse solenoid 233 are connected with electric current in opposite direction so that forward solenoid 232, reverse solenoid 233 adjacent produces like pole；Meanwhile, aluminium ring shape pipeline 231 can improve magnetic circuit, strengthens pipeline Magnetic field intensity at inwall, strengthens the irony magnetic conduction cap 234 capture absorbability to granule.Each forward solenoid 232, reverse spiral shell Spool 233 electric current is directly controlled by ECU1, can be different with concentration and change, to obtain optimal adsorption according to the size of granule Performance.And by the setting of electric shock hammer 236, prevent granule bulk deposition at irony magnetic conduction cap 234, affect adsorption effect.This Time, controlled the inwall of electric shock hammer 236 percussion pipeline 231 by electric magnet 237 so that adsorbed granule scatter to both sides. Meanwhile, when cleaning pipeline 231, the percussion of electric shock hammer 236 can also improve cleaning performance.

After described magnetic suck module 23 has been adsorbed, ECU1 controls electric magnet power-off, and paramagnetism aluminum matter pipeline loses magnetism, It is attached to magnetic polymeric bulky grain on inner-walls of duct will be disengaged from tube wall and enter electrification module 24 with fluid along tube wall with low speed.

Described electrification module 24 makes the non-ferromagnetic metal wear particle in hydraulic oil charged, its by some electrodes 241 with And one electrode controller 242 form.Described some electrodes 241 are installed on fluid pressure line 9, and it is respectively connecting to electrode controller 242.Described electrode controller 242 is electrically connected with and applies voltage to electrode 241, makes the particulate matter in fluid charged.

Non-ferromagnetic metal wear particle in fluid is adsorbed on tube wall by described electric adsorption module 25, and it is by aluminum matter pipe Road 251, positive plate 252, minus plate 253 and pole plate controller 254 form.Wherein, described positive plate 252, minus plate 253 points It is not arranged on aluminum matter pipeline 251, and in being oppositely arranged；Described positive plate 252, minus plate 253 are respectively and electrically connected to pole plate On controller 254；Described pole plate controller 254 is electrically connected to ECU1, and by ECU1 control.

The operation principle of described electric adsorption module 25 is as follows: charged non-ferromagnetic material metallic wear particles with fluid with speed V flows into electric adsorption module 25 along tube wall, and two electrodes of the negative and positive of electric adsorption module 25 525,253 are controlled by pole plate controller 254 Produce the uniform electric field vertical with speed V direction, then charged corpuscle is subject to be perpendicular to velocity attitude in electric field is centrifuged module The effect of electric field force, makes charged particle do parabolic motion to pole plate under this force, and charged corpuscle is inhaled along the direction of motion Other microgranule attached forms polymeric macroparticle.This parabolic motion specifically refer to charged corpuscle axially follow fluid do straight line fortune Dynamic, radially then do at the uniform velocity or variable motion under electric field force effect, changing electric field intensity by pole plate controller 254 can change Movement velocity, makes charged polymeric bulky grain be adsorbed onto on tube wall.After having adsorbed, when ECU1 controlling plate controller 254 power-off Time, it is attached to magnetic polymeric bulky grain on inner-walls of duct and will be disengaged from tube wall and enter rotation moulding mould with fluid along tube wall with low speed Block 3.

The moulding module of described rotation 3 is for improving the sensitivity of detection.Research shows: the inductance rate of change of cell winding It is directly proportional to the cube of abrasive particle radius.Meanwhile, the form of magnetizing mediums more trends towards elongate, and its demagnetizing factor is the least, magnetization Intensity is the biggest, and magnetizing field field intensity is the biggest.Change on sensor equivalent inductance affects the biggest.The moulding module of this rotation 3 is by aluminum matter A few part groups such as pipeline 31, some windings 32, iron shell 33, flange 34 and the moulding current output module of some rotations 35 Become.Wherein, described some windings 32 are rotating around outside aluminum matter pipeline 31；Described iron shell 33 is coated on aluminum matter pipeline 31； Described flange 34 is welded on the two ends of aluminum matter pipeline 31；The moulding current output module of each rotation 35 is connected to a winding 32.

The design principle of the moulding module of described rotation 3 is as follows: polymeric macroparticle enters with fluid after rotating moulding module 3, ECU1 controls to rotate moulding current output module 35, makes to flow through three-phase symmetrical electric current in the moulding current output module of rotation 35, should Electric current produces rotating excitation field in aluminum matter pipeline 31.Magnetized particles is acted on by magnetic field force under rotating excitation field effect, and Spirally advancing under the effect of this power, magnetic microparticles defines a lot of acicular texture along magnetic line of force direction, these acicular textures Magnetic field will be followed spin motion when magnetic field rotating, and specifically move along a straight line axially following fluid, radially then follow rotation Turn magnetic field to spin motion.Adjust three-phase symmetrical electric current and can change speed and the track of screw.Needle-like knot when motion When metal particle on structure and movement locus meets with, it is combined with one another to bulky grain polymer.By rotating moulding module 3, make oil The particle diameter of the metal particle in liquid increases form simultaneously and becomes elongated acicular texture so that the fiber number of metal particle increases the most greatly Add, further enhancing the sensitivity of Double-coil type detection.

Metallic wear particles is non-uniform Distribution in oil circuit, and variations in flow patterns is sufficiently complex, when particle size and material become During change, its changes of magnetic field caused is the faintest, if detection Magnetic field inhomogeneity will cause serious measurement error, makes detection spirit Sensitivity reduces；Double-coil type detection of particulates requires that the characteristic of detection line coil and a reference coil is completely the same simultaneously, and this is usually very Inaccessible, need the detection coil 7 of design to have the function of on-line automatic regulation for this.Specifically, described detection coil 7 Winding be made up of positive winding 71 and inverse winding 72, each winding is connected to an exciting current output module 73, and this exciting current is defeated Go out module 73 to be controlled by ECU module, its use digital potentiometer be AD5206, there is the output of 6 passages, can with ECU1 it Between realize single bus data transmission.ECU realizes the electricity to the polylith exciting current output module 73 magnetizing winding by monobus Stream sets and output.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.

The operation principle of described detection coil 7 is as follows: in order to produce the magnetic field in same polarity direction and make up breach and make simultaneously The magnetic field become is unbalanced, and positive winding 71 is identical with the current characteristics in inverse winding 72, arranges on the axis direction of conduit under fluid pressure 9 There is multipair forward and reverse winding, control electric current by different exciting current output modules 73, it is possible to form the uniform magnetic of system requirements ?.

Further, described detection coil 4, reference coil 5 are in series, and both form a sensor.When detection coil 4 In middle time without abrasive particle, owing to detection coil 4 is identical with reference coil 5 characteristic, there is no output voltage.And when abrasive particle enters detection coil When 4, then causing the change of sensor output voltage, this variable quantity is metastable.When in fluid by there being big of metal During grain, cause disturbance of magnetic field, cause sensor coil to produce induction electromotive force.Utilize ferromagnetics and non-ferromagnetic material metal particle to former The otherwise impact in magnetic field, causes phase of output signal contrary, can distinguish wear particle type in fluid；Magnetic media grain is the biggest, Fiber number is the biggest, and the biggest on magnetic field impact, the amplitude of output signal is the biggest, and the sensitivity of detection is the highest.Utilize ferromagnetics and non-ferric The magnetic substance metal particle otherwise impact to former magnetic field, causes phase of output signal contrary, can distinguish wear particle type in fluid, Thus realize that signal conformance is good, reliability is high, the detection Double-pipe plug-in type structure changes twin coil fluid that signal is strong and error is little Online monitoring system.

Due to the existence of hysteresis, after ferromagnetic material is magnetized into saturation, even if cancelling externally-applied magnetic field, in material Magnetic induction still return less than zero point, need externally-applied magnetic field demagnetization.In order to prevent magnetic microparticles from entering hydraulic circuit, to pollution Sensitive Hydraulic Elements cause damage, devise demagnetization module 9, including remanent magnetism sensor and demagnetizer.ECU1 goes out according to demagnetizer At Kou, the detected value of remanent magnetism sensor controls the demagnetization intensity of demagnetizer.The demagnetization method herein used is electromagnetism demagnetization, method It 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.

The concrete grammar using above-mentioned supervising device to be monitored hydraulic oil is as follows:

1), the fluid in fluid pressure line 9 passes through wave filter 8, the high, medium and low frequency range that wave filter 8 is decayed in hydraulic system Fluctuation pressure, and suppression flowed fluctuation；

2), fluid enters the mechanical centrifugal module 21 separating adsorption module 2 afterwards, makes the wear particle in fluid be polymerized also Realizing initial centrifugation, the polymeric macroparticle making quality bigger gets rid of to near-wall；

3), make ferromagnetic metal polymeric macroparticle force-magnetized by magnetized module 22；

4), magnetic suck module 23 adsorbs the big microgranule of magnetized metal polymerization；

5), by electrification module 24, the non-ferromagnetic metal wear particle charged polymeric in fluid is made；

6), charged particle flows into electric adsorption module 25 with speed v subsequently, and electric adsorption module 25 is controlled to produce and speed by ECU1 The uniform magnetic field that degree v direction is vertical, charged particle is subject to be perpendicular to the Lip river logical sequence of velocity attitude and magnetic direction in segregation apparatus The effect of magnetic force, makes charged particle under this force to aluminum matter vessel wall motion, so that the non-ferromagnetic metal in fluid Wear particle " separates " out from fluid, and absorption is on tube wall.

7), after magnetic suck and electro-adsorption to enough particle concentrations, ECU1 first controls electric adsorption module 25 by electric field side To first reversely, then cancel electric field, then adsorb non-ferromagnetic metal wear particle on tube wall and start to depart from tube wall delay from static Slow-motion enters to rotate moulding module 3, and electric adsorption module 25 the most then recovers original electric field.Meanwhile, ECU1 controls magnetic suck mould Block 23 power-off, paramagnetism aluminum matter pipeline loses magnetism, and is attached to magnetic polymeric bulky grain on inner-walls of duct and will be disengaged from tube wall, electrification The power-off of module 24, ferromagnetic particle flows through electrification module 24 and electric adsorption module 25 with low speed with fluid, enters rotation moulding Module 3.Subsequently, magnetic suck module and the electrification original duty of module recovery.

8), charged nonferromagnetic microgranule and magnetized ferromagnetic particle successively enter and rotate moulding module 3, now ECU1 Controlling to flow through three-phase symmetrical electric current in three-phase symmetric winding, this electric current produces rotating excitation field in aluminum matter pipeline.Magnetized particles exists Being acted on by magnetic field force under rotating excitation field effect, and the most spirally advance, magnetic microparticles is along the magnetic line of force Direction defines a lot of acicular texture, and these acicular textures will be followed magnetic field and be spinned motion when magnetic field rotating, when motion When metal particle in acicular texture and movement locus meets with, it is combined with one another to bulky grain polymer.

9), by rotating moulding module 3, make the particle diameter of the metal particle in fluid increase form simultaneously and become elongated needle-like Structure so that the fiber number of metal particle is also greatly increased, further enhancing the sensitivity of Double-coil type detection.This two class subsequently Microgranule enters detection coil 4 with the state of low speed, high concentration, bulky grain and big fiber number in batches, and ECU1 controls exciting current and keeps The magnetic field homogeneity of detection coil 4, simultaneously because the power of test of Ferrous particles is greater than copper by the inductance of same model The power of test of granule, need ECU regulation exciting current to compensate this difference, with keep output concordance.Flow sensing Flow parameter when device 7 is for detecting measurement, for measurement result correction.

10), time in detection coil 4 without abrasive particle, there is certain fluctuation in the total null voltage of sensor, due to detection coil 4 Identical with reference coil 5 characteristic, there is no output voltage.And when abrasive particle enters detection coil, then cause sensor output voltage Change, this variable quantity is metastable.When in fluid by there being metal bulky grain, cause disturbance of magnetic field, cause producing Raw induction electromotive force.Utilize ferromagnetics and the non-ferromagnetic material metal particle otherwise impact to former magnetic field, cause phase of output signal On the contrary, wear particle type in fluid can be distinguished；Magnetic media grain is the biggest, and fiber number is the biggest, the biggest on magnetic field impact, output signal Amplitude the biggest, the sensitivity of detection is the highest.Utilize ferromagnetics and the non-ferromagnetic material metal particle otherwise impact to former magnetic field, lead Cause phase of output signal is contrary, can distinguish wear particle type in fluid.Thus realize that signal conformance is good, reliability is high, inspection Survey the Double-pipe plug-in type structure changes twin coil fluid online monitoring system that signal is strong and error is little.

11), eliminate magnetic particle magnetic by demagnetization module 9, prevent magnetic microparticles from entering hydraulic circuit, sensitive to pollution Hydraulic Elements cause damage.

Above detailed description of the invention is only the preferred embodiment of this creation, not in order to limit this creation, all in this wound Any modification, equivalent substitution and improvement etc. done within the spirit made and principle, should be included in this creation protection domain it In.

Claims (10)

1. one kind uses the filtering of full frequency band structure changes, absorption and moulding Oil Monitoring method, it is characterised in that: it uses one Monitoring device, this equipment is arranged on fluid pressure line, including wave filter, separate adsorption module, rotate moulding module, detection line Circle, reference coil, demagnetization module, flow transducer and ECU；Wherein, described wave filter, separate adsorption module, rotate moulding Module, detection coil, flow transducer, demagnetization module are successively set on fluid pressure line；Described detection coil, reference coil phase Series connection；Described ECU be electrically connected with and control wave filter, separate adsorption module, rotate moulding module, detection coil, reference Coil, demagnetization module and flow transducer；Described wave filter includes that input pipe, shell, outlet tube, S type elastic thin-wall, H type are filtered Ripple device and cascaded H mode filter；Wherein, described input pipe is connected to one end of shell, itself and hydraulic oil inlet docking；Institute Stating outlet tube and be connected to the other end of shell, itself and U-shaped separation of particles module are docked；Described S type elastic thin-wall is along the footpath of shell In being installed on shell, in it, form expansion chamber and contraction chamber；Described input pipe, outlet tube and S type elastic thin-wall are collectively forming One S type cavity volume wave filter；Some taper structure changes damping holes are uniformly had in the axial direction of described S type elastic thin-wall；Described taper Structure changes damping hole is made up of cone shaped elastic damping hole pipe and slot apertures；Series connection is formed altogether between described S type elastic thin-wall and shell Shake cavity volume I and parallel resonance cavity volume；The outside of described resonance series cavity volume I sets a resonance series cavity volume II, and described series connection is altogether Shake and insert pipe connection by a taper between cavity volume I and resonance series cavity volume II；Described H mode filter is positioned at parallel resonance cavity volume In, it is connected with taper structure changes damping hole；Described cascaded H mode filter is positioned at resonance series cavity volume I and resonance series is held In the II of chamber, it is also connected with taper structure changes damping hole；Described H mode filter and cascaded H mode filter the most symmetrically set Put, and form connection in series-parallel H mode filter；Described separation adsorption module is by the mechanical centrifugal module being sequentially connected with, magnetized module, magnetic Adsorption module, electrification module and electric adsorption module composition；It comprises the steps:

1), the fluid in fluid pressure line passes through wave filter, the pulsation pressure of the high, medium and low frequency range in filter attenuation hydraulic system Power, and suppression flowed fluctuation；

2), fluid enters the mechanical centrifugal module separating adsorption module afterwards, at the beginning of making the wear particle in fluid be polymerized and realize Step is centrifugal, and the polymeric macroparticle making quality bigger gets rid of to near-wall；

3), make ferromagnetic metal polymeric macroparticle force-magnetized by magnetized module；

4), the magnetic suck module absorption big microgranule of magnetized metal polymerization；

5), fluid passes through electric ignitor, makes the non-ferromagnetic metal wear particle charged polymeric in fluid；

6), fluid flows into electric adsorption module, electric adsorption module absorption non-ferromagnetic metal wear particle；

7), ECU first controls electric adsorption module by direction of an electric field the most reversely, then cancels electric field, makes non-ferromagnetic metal wear particle Enter and rotate moulding module, recover electric field afterwards；Meanwhile, ECU controls magnetic suck module and the power-off of electrification module, ferromagnetism Grain enters and rotates moulding module；Subsequently, magnetic suck module and the electrification original duty of module recovery；

8), charged nonferromagnetic microgranule and magnetized ferromagnetic particle successively enter and rotate moulding module, make two in fluid The particle diameter increase form simultaneously planting metal particle becomes elongated acicular texture so that the fiber number of metal particle is also greatly increased；

9), two based fine particles enter detection coil in batches, and are carried out the class of monitoring particulate by the cooperation of detection line coil and a reference coil Type and quantity；

10), magnetic particle magnetic is eliminated by demagnetization module.

2. employing full frequency band structure changes filtering as claimed in claim 1, absorption and moulding Oil Monitoring method, its feature exists In: the axis of described input pipe and outlet tube is the most on the same axis；The wider place of described taper structure changes damping hole opening is positioned at In resonance series cavity volume I and parallel resonance cavity volume, its taper angle is 10 °；Described taper structure changes damping hole cone shaped elastic damps The Young's modulus of hole pipe is bigger than the Young's modulus of elastic thin-wall, can be with change in fluid pressure stretching or compression；The Young of slot apertures The Young's modulus of modular ratio cone shaped elastic damping hole pipe wants big, can be with fluid opened by pressure or closedown；Described taper is inserted pipe and is opened The wider place of mouth is positioned at resonance series cavity volume II, and its taper angle is 10 °.

3. employing full frequency band structure changes filtering as claimed in claim 1, absorption and moulding Oil Monitoring method, its feature exists In: described mechanical centrifugal module uses eddy flow to be centrifuged module；Described eddy flow be centrifuged module include eddy flow tube wall, the first flow deflector, Second flow deflector, motor and flow transducer；Wherein, described first flow deflector is provided with 3, these 3 first flow deflectors Being uniformly distributed along tube wall inner periphery every 120 °, its laying angle is set to 18 °；Described second flow deflector and the first flow deflector structure phase With, after it is arranged on the first flow deflector, and and the first flow deflector stagger 60 ° and be connected in tube wall, its laying angle is set to 36 DEG C；Institute The long limit stating the first flow deflector is connected with tube wall, and minor face extends along the axis of tube wall；Its leading edge frustrates into obtuse, and trailing edge is processed into the wing Shape, its height is 0.4 times of tube wall diameter, 1.8 times of a length of tube wall diameter；Described motor connects and drives first to lead Flow and the second flow deflector, to regulate laying angle；Described flow transducer is arranged on the central authorities in tube wall.

4. employing full frequency band structure changes filtering as claimed in claim 1, absorption and moulding Oil Monitoring method, its feature exists In: described magnetized module includes aluminum matter pipeline, some windings, iron shell and flange；Wherein, described some windings rotating around 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.

5. employing full frequency band structure changes filtering as claimed in claim 1, absorption and moulding Oil Monitoring method, its feature exists In: described magnetic suck module uses homopolarity adjacent type absorbing ring, and this 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 In pipeline, both are connected with electric current in opposite direction so that forward solenoid and reverse solenoid adjacent produce like pole；Institute State irony magnetic conduction cap to be arranged on the inwall of aluminium ring shape pipeline, its be positioned at forward solenoid and reverse solenoid adjacent, with And forward solenoid and the intermediate point of reverse solenoid axis.

6. employing full frequency band structure changes filtering as claimed in claim 1, absorption and moulding Oil Monitoring method, its feature exists In: described magnetic suck module uses the homopolarity adjacent type absorbing ring of charged hammer, the homopolarity adjacent type absorbing ring of this charged hammer Including 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 just Like pole is produced to solenoid and reverse solenoid adjacent；Described irony magnetic conduction cap is arranged in the inwall of aluminium ring shape pipeline On, 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 electricity Magnet connects and can promote electric shock hammer, makes electric shock hammer tap aluminium ring shape inner-walls of duct.

7. employing full frequency band structure changes filtering as claimed in claim 1, absorption and moulding Oil Monitoring method, its feature exists In: described electrification module includes some electrodes and an electrode controller；Described some electrodes are installed on fluid pressure line, its point It is not connected to electrode controller.

8. employing full frequency band structure changes filtering as claimed in claim 1, absorption and moulding Oil Monitoring method, its feature exists In: described electric adsorption module includes aluminum matter pipeline, positive plate, minus plate and pole plate controller；Wherein, described positive plate, the moon Pole plate is separately positioned on aluminum matter pipeline, and in being oppositely arranged；Described positive plate, minus plate are respectively and electrically connected to pole plate control On device；Described pole plate controller is electrically connected to ECU, and by ECU control.

9. employing full frequency band structure changes filtering as claimed in claim 1, absorption and moulding Oil Monitoring method, its feature exists In: the moulding module of described rotation includes that aluminum matter pipeline, some windings, iron shell, flange and the moulding electric current of some rotations are defeated Go out module；Wherein, described some windings are rotating around 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；The moulding current output module of each rotation is connected to a winding.

10. employing full frequency band structure changes filtering as claimed in claim 1, absorption and moulding Oil Monitoring method, its feature It is: the winding of described detection coil is made up of positive winding and inverse winding, and each winding is connected to an exciting current output module, should Exciting current output module is controlled by ECU module.