CN1072261A - Online hydraulic system pollution particle monitor - Google Patents
Online hydraulic system pollution particle monitor Download PDFInfo
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- CN1072261A CN1072261A CN 91108238 CN91108238A CN1072261A CN 1072261 A CN1072261 A CN 1072261A CN 91108238 CN91108238 CN 91108238 CN 91108238 A CN91108238 A CN 91108238A CN 1072261 A CN1072261 A CN 1072261A
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- spring
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- constant force
- piston
- oil cylinder
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Abstract
A kind of online hydraulic system pollution particle monitor is made up of sensitive guiding valve, constant force drive unit and displacement transducer, by the gap X constant, that size is suitable of hydraulic pressure difference provide to fluid before and after
0, the contaminant particles information in the fluid in this gap of flowing through can be reflected by the situation of being deposited in this gap, thereby hydraulic system is implemented in the monitoring of line states.With this monitor and with the single card microcomputer is the supporting use of monitor of core, then can carry out continuous dynamic monitoring to system, as the observation of oil contamination situation, the judgement of unusual pollution source, the function prediction of system, the life prediction of parts etc.
Description
The invention belongs to the device that the solid phase particles in the convection cell is measured.
Hydraulic components have higher quality of fit, and the contaminant particles in the system can have a strong impact on the function of these parts even cause stuck phenomenon, thereby influences the reliability of system, also can cause major accident sometimes, causes enormous economic loss and casualties; Simultaneously, the pollution condition in the system (as particle size, concentration etc.) has also reflected the state of wear and the function drift degree of parts in the system.Therefore, except adopting various filtering techniques (is cost with the pressure loss), various effective pollution monitoring technology are more and more paid attention to by people.At present to the pollution monitoring of the hydraulic system modes that regularly extract oil sample, off-line analysis diagnosis that adopt, as ferrograph, spectrometer, corpuscular counter etc. more.The off-line analysis mode is because the hysteresis on the life period can not be diagnosed also forecast system fault in good time, so be subjected to certain limitation on using.
The object of the present invention is to provide a kind of pollution particle monitor that can realize on-line condition monitoring to hydraulic system.
Pollution particle monitor involved in the present invention is made up of sensitive guiding valve, constant force drive unit and displacement transducer three parts; Wherein sensitive guiding valve is made up of retaining valve, oil cylinder, piston, spool, valve pocket, back-moving spring and seal, retaining valve is positioned at oil cylinder inflow point, the oil-feed direction certainly outward inwards, between piston crown and the oil cylinder seal is arranged, valve core housing is in piston tail, and the piston axes place is a through hole, there are a cross through hole and piston heart hole to intersect on the spool, spool is outward a valve pocket, and the valve pocket cylindrical leaves circumferential clearance x less than the oil cylinder internal diameter between spool and the valve pocket
0But before valve core through hole, be added with seal, there is a back-moving spring to be enclosed within the piston middle part before the valve pocket, back-moving spring is in most compressed state when the valve pocket tail end is positioned at before the valve core through hole, an inner baffle shoulder is established at the oil cylinder rear portion, the inner baffle shoulder internal diameter must not be less than the valve pocket internal diameter, also must not be greater than the valve pocket external diameter, the distance of bottom must be greater than the distance of valve core through hole to the spool tail end from the inner baffle shoulder front end to oil cylinder, the oil cylinder tail end links to each other with the shell of constant force drive unit, the piston tail end links to each other with the guide rod of constant force drive unit, the constant force drive unit is by constant force spring, last lower spring cup, retainer up and down, guide rod and shell are formed, have draining hole and spill port on the shell, constant force spring is formed by the extension spring eccentric compression of spring arm biasing, at least a pair of, the spring base matrix is discoid, it is the frustum of a cone of arcuation that bus is arranged on it, retainer also is discoid matrix, along its periphery annular projection is arranged, also have corresponding on spring base and the retainer with the spring number, and do not reach the axle center, along the axle center in twos the symmetry open slot, the two ends of constant force spring are stuck on the cambered surface of lower spring cup by the collar respectively, and spring arm correspondingly is embedded in the open slot of retainer, be that every pair of spring is settled along spring base axle center symmetria bilateralis, upper spring seat is loaded on the guide rod bottom, lower spring cup links to each other with outer casing bottom, the frustum of a cone top of last lower spring cup relatively, spring base is corresponding mutually with open slot on the retainer, and displacement transducer is loaded on outside the outer casing bottom of constant force drive unit, and the sounding rod of sensor links to each other with guide rod.
Below in conjunction with drawings and Examples technical scheme of the present invention is further described.
Accompanying drawing 1 monitor design concept figure
Accompanying drawing 2 monitor structural representations
The synoptic diagram of accompanying drawing 3 constant force springs a) forms principle, b) family curve
Accompanying drawing 4 monitor block diagrams
Accompanying drawing 5 monitoring system synoptic diagram, a) parallel way, b) series system
The design concept of monitor following (seeing accompanying drawing 1):
When a slide block when in oil cylinder, being in axial sliding under the effect of power F, be enclosed in fluid in the oil cylinder will be under pressure circumferential gap around the slide block flow out.Because flowing through, normal hydraulic oil liquid is laminar condition during this gap, so satisfy following formula
Q= (πdχ
3 0Δp)/(12ηl) (χ
0《l)〔1〕
Q is the fluid flow in the formula, and △ P is the pressure reduction of fluid before and after the slide block, x
0Be designed circumferential clearance amount, l is a gap length, and d is the oil cylinder internal diameter, and η is an oil viscosity.
When the suffered driving force F of slide block was constant, pressure reduction △ P was constant, and d, η, l also are constant, so the flow Q ∝ x in the formula (1)
3 0If in the oil cylinder be pure hydraulic oil, then undoubted, the fluid that is closed will flow out from this gap to wait flow.If but contain a certain amount of solid pollution particle in the fluid, and and this gap value is less, when the fluid that then is mixed with contaminant particles was flowed through this gap, contaminant particles will deposit in this gap, thereby flow is reduced.It is serious more to deposit, and then flow Q reduces many more.Gap x after alluvial
t→ 0 o'clock, flow Q → 0.
When other condition is constant, because the contaminant particles speed of depositing in this gap is relevant with concentration, the granularity of particle itself, so be slider displacement speed ds/dt → 0 by mensuration flow Q → 0() time slide block displacement s just can obtain contaminant particles information in the fluid.
According to above ultimate principle, designed monitor structure as shown in Figure 2, it is made up of sensitive guiding valve, constant force drive unit and displacement transducer three parts, the effect of sensitive guiding valve provides a suitable gap x
0, the effect of constant force drive unit is that the piston to sensitive guiding valve provides a constant driving force F, displacement transducer then is that the displacement s with piston converts electric signal to for easy to detect.Wherein sensitive guiding valve is made up of oil cylinder (2), piston (3), retaining valve (1), spool (5), valve pocket (6), back-moving spring (4) and seal (7,8).Connect oil pipe before the retaining valve, fluid is in retaining valve enters oil cylinder.The piston crown side is put sealing ring (8) makes this part cylinder cavity in piston the place ahead form sample region.The through hole at piston axes place (27) front end is hydraucone and play the guiding role, and can make things convenient for oil sample to enter through hole like this.Through hole on the spool (26) traverses both sides, but the i.e. equal draining in both sides.Adopt clearance fit to form required circumferential clearance x between spool and the valve pocket
0, and between spool before the valve core through hole and valve pocket, make by sealing ring (7) is set that fluid is unlikely to release forward.Back-moving spring is a compression spring, when valve pocket covers spool, forms required circumferential clearance x
0The time, back-moving spring is in the part compressive state, and when spool moved to valve core through hole backward and is exposed to outside the valve pocket, back-moving spring was in most compressed state.The effect of inner baffle shoulder (28) is to stop valve pocket to move to the oil cylinder bottom, can expose valve core through hole and keep spool still can move backward at least under piston drives.The constant force drive unit then by constant force spring (14), go up lower spring cup (11,16), retainer (13,20), guide rod (10) and shell (9) are formed up and down.Its shell directly links to each other with oil cylinder, forms the oil cylinder bottom, also plays the role of positioning simultaneously, makes sensitive guiding valve and constant force drive unit keep concentric, has draining hole (25) and spill port (24) on the shell and makes through circumferential clearance x
0The fluid that enters the oil cylinder rear portion returns detected oil circuit through this.The visible accompanying drawing 3 of the formation of constant force spring, it will have the extension spring eccentric compression (seeing accompanying drawing 3a) of initial and tight power, spring arm biasing when the coiling, its stiffness characteristics just shows one section " zero stiffness " district preferably near extreme point, thereby has the load character of deciding (seeing accompanying drawing 3b).Groove of being opened on last lower spring cup and the retainer (19,22) and the projection (21,23) on the retainer are in order to keep in the constant force spring work not unstability.The two ends of spring are used lower collar (12,15) respectively and are stuck on the cambered surface of spring base, can make each spring stress evenly, reduce unbalance loading.Be clearance fit between guide rod and the shell, can make guide rod free movement vertically like this, driving force F is played guiding and transmission.Equally, also adopt clearance fit to reduce the resistance of motion between sounding rod of displacement transducer (17) and the shell.Displacement transducer (18) is then selected the as far as possible little product of resistance to displacement of sounding rod for use, and its range is more preferably greater than 60mm.
In above-mentioned design proposal, by sensitive gap x
0The fluid flow be
Q＝ (π)/4 D
2(ds)/(dt) 〔2〕
D is a piston diameter in the formula, and s is piston displacement, and ds/dt is a piston traveling speed.When throw of poston Smax long enough, and in the fluid maximum particle diameter of contaminant particles less than design gaps x
0The time, according to formula (1) and (2), can get
(ds)/(dt) = (d)/(D
2) (ΔP)/(3ηl) χ
3 i〔3〕
Obviously work as x
t→ 0 o'clock, dx/dt → 0, there is following relation in the weight ratio concentration c of contaminant particles in the displacement s of piston and the oil sample at this moment
S｜ (ds)/(dt) 0=4 (dl)/(D
2) (ρ
s)/(ρ
0) χ
01/(c) 〔4〕
In formula (3), (4), x
tBe the residual gap amount after the t particle alluvial constantly, d is the diameter of sensitive gap location, ρ
sBe the density of contaminant particles, ρ
0Be fluid density.And contaminant particles concentration
W wherein
sBe the relative weight of the contaminant particles of solid phase, w
0Relative weight for fluid.
Therefore
This shows that the displacement s that piston is passed by when piston displacement speed (ds)/(dt) → 0 and the pollution concentration c of tested oil sample are inversely proportional to.Can obtain tested contaminant particles concentration according to the displacement that records.
The course of work of this monitor is as follows: detected fluid enters oil cylinder through retaining valve, the pressure of hydraulic oil is greater than the driving force of constant force drive unit in this moment system, fluid is shifted piston and spool onto oil cylinder bottom (being the rightmost position of oil cylinder in the accompanying drawing 2), valve pocket is promptly opened by inner baffle shoulder, this moment, oil circuit was unimpeded, and the fluid in the sample region releases through piston heart hole and valve core through hole.When a detection oil circuit cut-out, when fluid stops to enter oil cylinder, oil liquid pressure in the oil cylinder can reduce (because this moment, the draining oil circuit was still unimpeded) gradually, when oil pressure drops to the driving force that is lower than the constant force drive unit, piston begins to be moved to the left under constant force drives, drive spool, valve pocket together, but valve pocket moves right under action of reset spring again simultaneously, so the circumferential clearance x between the spool valve pocket
0Promptly form, the contaminant particles in the fluid begins to deposit in this gap, and piston displacement speed reduces gradually, and amount of piston displacement s is detected by displacement transducer.The amount of piston displacement s that detects when ds/dt → 0 can be for being converted into contaminant particles concentration.If will detect oil circuit and reclose this moment, then the hydraulic oil in the system pours oil cylinder and promotes piston and move right fast, make formation is enough between valve pocket and the inner baffle shoulder impact to open oil circuit, under the washing away of valve pocket axial vibration that back-moving spring and constant force spring cause and hydraulic oil, the contaminant particles of alluvial at the circumferential clearance place is cleaned totally, and oil circuit is in unimpeded state heavily again.
When this monitor is directly applied to the on-line monitoring of system, preferably adopt the supporting with it use of a cover automonitor.The core of monitor is a single card microcomputer, and it can not only satisfy basic demands such as sampling and control, can also remember the oil sample sample of a longer sampling time sequence, so that carry out trend analysis and fault diagnosis etc.The block diagram of monitor as shown in Figure 4, enter the dynamic storage (30) of single card microcomputer through A/D converter (29) from the displacement electric signal of monitor, this storer can refresh automatically, remain (for example 128 of some oil samples under the current state, selected by the deviser) sequence samples, this sample is analyzed, is handled by analysis and processing unit (32) on the one hand, when needs, can read on the other hand by magnetic tape station (31), data-signal after analyzing, handling shows to display (34), and is furnished with warning device.Control signal is control electromagnetic switch valve events after PIO mouth (35) and amplifier (36) amplification.Function keyboard (33) uses for operating personnel.
When using this monitor and supporting monitor thereof hydraulic system being carried out online detection, can adopt parallel connection or connect two kinds of connecting modes and detected oil circuit link, see accompanying drawing 5.Parallel is to establish a branch oil circuit to make to detect oil circuit in working connection, fluid arrives monitor (38) through 22 energising magnetic reversal valves (37), come out through scavenge pipe to working connection from monitor again, displacement signal is from the monitor to the monitor (39) then, send control signal after handling by analysis and give solenoid directional control valve.In-line just not establishing detected along separate routes, solenoid directional control valve and monitor directly are connected in the working connection, this moment solenoid directional control valve to adopt 23 logical.
Testing process is as follows: send instruction by monitor when the sampling period begins, solenoid directional control valve is opened, and the fluid collection is gone in the oil cylinder; When sense cycle begins, monitor sends signal and makes the solenoid directional control valve transposition, cuts off oil circuit; After sense cycle finished, monitor sent signal again and makes the solenoid directional control valve transposition, and oil circuit is connected, and this moment, monitor entered the sampling period again; Circulation successively.
In an embodiment of the present invention, what retaining valve adopted is spherical valve, back-moving spring is common compression spring, seal is combined by O RunddichtringO and poly-tetrafluoro baffle ring, the inner baffle shoulder of annular directly processes on the shell by the constant force drive unit, and constant force spring has been used three pairs, and lower spring cup is processed into one with following retainer, displacement transducer adopts differential transformer type, and single card microcomputer adopts the TP801 type.
The technical requirement that monitor of the present invention can satisfy is: the contaminant particles particle size range is 1 μ m～100 μ m, and concentration range is 1ppm～500ppm.
Use monitor of the present invention and supporting monitor and can carry out continuous, dynamic on-line condition monitoring the contaminant particles concentration in the hydraulic system, also capable of automatic alarm when pollution concentration surpasses higher limit, according to the situation of change and the concentration value size of pollution concentration in the data of continuous sampling: but 1. whether decision systems needs to change oil; 2. in the decidable system whether unusual pollution source are arranged; 3. can carry out trend analysis and forecast to the function of system, the life-span of parts etc.
Claims (1)
- A kind of online hydraulic system pollution particle monitor is characterized in that being made up of sensitive guiding valve, constant force drive unit and displacement transducer; Wherein sensitive guiding valve is by retaining valve, oil cylinder, piston, spool, valve pocket, back-moving spring and seal are formed, the constant force drive unit is by constant force spring, last lower spring cup, retainer up and down, guide rod and shell are formed, retaining valve is positioned at oil cylinder inflow point, the oil-feed direction certainly outward inwards, between piston crown and the oil cylinder seal is arranged, valve core housing is in piston tail, the piston axes place is a through hole, there are a cross through hole and piston heart hole to intersect on the spool, spool is outward a valve pocket, the external diameter of valve pocket is less than the oil cylinder internal diameter, leave circumferential clearance Xo between spool and the valve pocket, but before valve core through hole, be added with seal, there is a back-moving spring to be enclosed within the piston middle part before the valve pocket, back-moving spring is in most compressed state when the valve pocket tail end is positioned at before the valve core through hole, an inner baffle shoulder is established at the oil cylinder rear portion, the inner baffle shoulder internal diameter must not be less than the valve pocket internal diameter, also must not be greater than the valve pocket external diameter, the distance of bottom must be greater than the distance of valve core through hole to the spool tail end from the inner baffle shoulder front end to oil cylinder, the oil cylinder tail end links to each other with the shell of constant force drive unit, the piston tail end links to each other with the guide rod of constant force drive unit, have draining hole and spill port on the shell, constant force spring is formed by the extension spring eccentric compression of spring arm biasing, at least a pair of, the spring base matrix is discoid, it is the frustum of a cone of arcuation that bus is arranged on it, retainer also is discoid matrix, along its periphery annular projection is arranged, also have with the spring number corresponding on spring base and the retainer, and do not reach the axle center, along the axle center in twos the symmetry open slot, the two ends of constant force spring are stuck on the cambered surface of lower spring cup by the collar respectively, and spring arm correspondingly is embedded in the open slot of retainer, be that every pair of spring is settled along spring base axle center symmetria bilateralis, upper spring seat is loaded on the guide rod bottom, lower spring cup links to each other with outer casing bottom, the frustum of a cone top of last lower spring cup relatively, open slot on spring base and the retainer is also corresponding mutually, displacement transducer is loaded on outside the outer casing bottom of constant force drive unit, and the sounding rod of sensor links to each other with guide rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91108238 CN1031960C (en) | 1991-11-13 | 1991-11-13 | On-line hydraulic system pollution particle monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91108238 CN1031960C (en) | 1991-11-13 | 1991-11-13 | On-line hydraulic system pollution particle monitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1072261A true CN1072261A (en) | 1993-05-19 |
| CN1031960C CN1031960C (en) | 1996-06-05 |
Family
ID=4909154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91108238 Expired - Fee Related CN1031960C (en) | 1991-11-13 | 1991-11-13 | On-line hydraulic system pollution particle monitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1031960C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608008A (en) * | 2012-03-13 | 2012-07-25 | 南京航空航天大学 | Online abrasion monitoring method based on electrostatic induction, online abrasion monitoring device based on electrostatic induction and experimental system |
| CN102606561A (en) * | 2012-02-24 | 2012-07-25 | 北京市三一重机有限公司 | Oil pollution control system and oil pollution control method |
| CN106442245A (en) * | 2016-10-13 | 2017-02-22 | 陈盈洁 | Initiative detection device for oil pollution degree |
| CN111379765A (en) * | 2018-12-26 | 2020-07-07 | 纳博特斯克有限公司 | Working fluid monitoring sensor and fluid pressure driving device |
-
1991
- 1991-11-13 CN CN 91108238 patent/CN1031960C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102606561A (en) * | 2012-02-24 | 2012-07-25 | 北京市三一重机有限公司 | Oil pollution control system and oil pollution control method |
| CN102606561B (en) * | 2012-02-24 | 2015-09-02 | 北京市三一重机有限公司 | Oil contamination control system and controlling method thereof |
| CN102608008A (en) * | 2012-03-13 | 2012-07-25 | 南京航空航天大学 | Online abrasion monitoring method based on electrostatic induction, online abrasion monitoring device based on electrostatic induction and experimental system |
| CN106442245A (en) * | 2016-10-13 | 2017-02-22 | 陈盈洁 | Initiative detection device for oil pollution degree |
| CN111379765A (en) * | 2018-12-26 | 2020-07-07 | 纳博特斯克有限公司 | Working fluid monitoring sensor and fluid pressure driving device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1031960C (en) | 1996-06-05 |
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