CN104502312A - Hydraulic system oil pollution degree detection system provided with fluorinated epoxy resin coating layer - Google Patents
Hydraulic system oil pollution degree detection system provided with fluorinated epoxy resin coating layer Download PDFInfo
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- CN104502312A CN104502312A CN201410696489.0A CN201410696489A CN104502312A CN 104502312 A CN104502312 A CN 104502312A CN 201410696489 A CN201410696489 A CN 201410696489A CN 104502312 A CN104502312 A CN 104502312A
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Abstract
The invention discloses a hydraulic system oil pollution degree detection system provided with a fluorinated epoxy resin coating layer, relates to the detection system belonging to the pollution detection technical field, and aims to provide the hydraulic system oil pollution degree intelligent detection system including a constant-power power source circuit, a light emitting diode I, an oil pool, a photoelectric diode I, a photoelectric conversion circuit and a signal processing circuit; an inlet pipe connector and an outlet pipe connector of the oil pool are communicated with a hydraulic system oil return pipeline through a first reversing valve and a second reversing valve; the first reversing valve and the second reversing valve are electrically connected with a control unit; the oil pool is provided with an incident light lens and an emergent light lens; the inner side wall of the oil pool is coated with the fluorinated epoxy resin coating layer; the signal processing circuit is connected with an RS485 bus; a light beam emitted by the light emitting diode I passes through the incident light lens, the oil pool and the emergent light lens and then irradiates on the photoelectric diode I to generate an electrical signal, and the electrical signal passes through the signal processing circuit and then is outputted by the RS485 bus.
Description
Technical field
The invention belongs to pollution detection technical field, relate to a kind of detection system detected for Oil Contamination in Hydraulic System, be specifically related to a kind of Oil Contamination in Hydraulic System detection system of fluorine-containing epoxy resin coating.
Background technology
In recent decades, hydrostatic transmission is widely used in the technical fields such as aviation, machine-building, petrochemical complex, mining machinery, communications and transportation, shipbuilding and earthquake prediction.Along with the usage quantity of hydraulically operated equipment (HOE) and increasing of kind, break down and the workload of keeping in repair also more and more large.And according to domestic and international statistical data, the failure rate more than 75% of hydraulically operated equipment (HOE) is caused by hydraulic oil pollution, and solid particulate matter is the pollutant the most general in hydraulic and lubricating system, damaging effect is maximum.
Along with hydraulic technique is in the widespread use of each industrial sector, the functional reliability of hydraulically operated equipment (HOE) is had higher requirement.Therefore, must detect the pollution situation of hydraulic system, carry out Environmental capacity.It is by regularly sampling at the scene that traditional oil contamination detects, and sample is taken back laboratory and carries out analysis acquisition mechanical movement situation.Although the detection of this off-line has the multifarious advantage of the equipment of analysis and means, there is acquisition long for information cycle, the deficiencies such as the operation conditions of equipment can not be reflected in time.Therefore, be badly in need of finding a kind of pick-up unit more timely and effectively newly.
Application number be 201010557386.8 patent of invention disclose a kind of hydraulic oil pollution degree detection method and device, the parallel connection below hydraulic system return line of this device is provided with a signal piping, enclosed hood is provided with outside described signal piping, a transparent pipeline is provided with in described signal piping, described transparent pipeline both sides are provided with photoelectric detection system, be provided with a pressure transducer between described signal piping and hydraulic system oil screen, described pressure transducer rational height is not less than hydraulic reservoir.This device is for detecting hydraulic system oil screen stopping state, pressure transducer is installed, according to principle of differential pressure, when oil screen pollutes not serious in oil screen pipeline front end, hydraulic oil is through oil screen oil return hydraulic reservoir more smoothly, and now in the pipeline of oil screen front end, return pressure is less; When oil screen due to hydraulic oil pollution serious time, oil return is subject to larger resistance through oil screen, and now oil screen front end pipeline inner pressure is comparatively large, the real-time detected pressures change of pressure transducer by signal transmission to central processing unit.Though this device detects in fluid the order of severity polluted by pressure transducer, to the size of particle concrete in fluid and content does not detect data or detection data are reliable not.
Summary of the invention
The object of the present invention is to provide the Oil Contamination in Hydraulic System detection system that a kind of volume is little, quality light, detection data are provided with fluorine-containing epoxy resin coating reliably.
For achieving the above object, technical scheme of the present invention is:
A kind of Oil Contamination in Hydraulic System detection system being provided with fluorine-containing epoxy resin coating, it is characterized in that: comprise the constant-power power source circuit connected successively, light emitting diode I, oil sump, photodiode I, photoelectric switching circuit and signal processing circuit, the inlet pipe joint of described oil sump, outlet pipe connection correspondence is by the first reversal valve, second reversal valve is communicated with hydraulic system return line, described first reversal valve, second reversal valve is electrically connected with control module, described oil sump is provided with incident light lens near light emitting diode I side, described oil sump is provided with emergent light lens near photodiode I side, described oil sump madial wall scribbles fluorine-containing epoxy resin coating at surveyed area place, described signal processing circuit is connected with RS485 bus, the parallel beam that described light emitting diode I sends power invariability under the effect of constant-power power source circuit through after oil sump through incident light lens is radiated on photodiode I produces electric signal through emergent light lens again, and described electric signal is exported by RS485 bus after photoelectric switching circuit, signal processing circuit.
When the present invention works, control module control the first reversal valve, the second reversal valve unlatching with closed, thus realize the fluid in hydraulic system return line to be delivered in oil sump to detect; Under the effect of constant-power power source circuit, the directional light of light emitting diode I generation power invariability is entered in oil sump by incident light lens, if there is particle to occur in oil sump, these particles will stop light and cause the reduction of luminous energy; Emergent light lens lighting is passed through on photodiode I through the light after oil sump, because the particle in oil sump has blocked some light, thus light intensity decays photodiode I received, by detecting the reduction degree being irradiated to luminous energy on photodiode I and the size and the content that succinctly calculate particle in oil sump, reliablely and stablely oil-liquid-solid particle pollution degree can be provided to detect data, and detect accurately fast; In addition, the oil sump madial wall being positioned at surveyed area scribbles fluorine-containing epoxy resin coating, when fluid flows through the oil sump madial wall scribbling fluorine-containing epoxy resin coating, under the effect of fluorine-containing epoxy resin coating, fluid is assembled at surveyed area place, thus effectively prevent single fluid and drip the unconspicuous defect of the detection signal caused by oil sump surveyed area, that improves detection system adds survey sensitivity, detects data more reliable, accurate.
Object of the present invention can also be realized by following approach:
Described incident light lens and emergent light lens are sapphire glass lens.
Described incident light lens are provided with opaque aluminium film, and described opaque aluminium center membrane position offers the viewing window for printing opacity.
Described photoelectric switching circuit comprises:
First trans-impedance amplifier, the positive ends of described first trans-impedance amplifier is connected with the positive ends of the second trans-impedance amplifier, and simultaneously ground connection,
The negative polarity end of described first trans-impedance amplifier is connected with one end of the first resistance with the anode of photodiode I respectively; The negative electrode of described photodiode I is connected with one end of the second resistance with the negative polarity end of described second trans-impedance amplifier respectively; The output terminal of the first trans-impedance amplifier described in another termination of described first resistance; The output terminal of the second trans-impedance amplifier described in another termination of described second resistance; The differential voltage V1-V2 of described first trans-impedance amplifier and described second trans-impedance amplifier output photoelectric conversion.
First electric capacity and the second electric capacity, described first Capacitance parallel connection connects described first resistance, and described second Capacitance parallel connection connects described second resistance.
Compared with prior art, beneficial effect of the present invention is:
1, in the present invention, the photoelectric sensing parts of detection system adopt light emitting diode I and photodiode I, make that the compact overall structure of detection system, volume are little, quality is light; Under the effect of constant-power power source circuit, the directional light of light emitting diode I generation power invariability is entered in oil sump by incident light lens, if there is particle to occur in oil sump, these particles will stop light and cause the reduction of luminous energy; Emergent light lens lighting is passed through on photodiode I through the light after oil sump, because the particle in oil sump has blocked some light, thus light intensity decays photodiode I received, by detecting the reduction degree being irradiated to luminous energy on photodiode I and the size and the content that succinctly calculate particle in oil sump, reliablely and stablely oil-liquid-solid particle pollution degree can be provided to detect data, and detect accurately fast; Control module carries out operational motion to reversal valve, not only saves manpower, increases work efficiency, and cost is low; In addition, the oil sump madial wall being positioned at surveyed area scribbles fluorine-containing epoxy resin coating, when fluid flows through the oil sump madial wall scribbling fluorine-containing epoxy resin coating, under the effect of fluorine-containing epoxy resin coating, fluid is assembled at surveyed area place, thus effectively prevent single fluid and drip the unconspicuous defect of the detection signal caused by oil sump surveyed area, that improves detection system adds survey sensitivity, detects data more reliable, accurate.
2, in the present embodiment, incident light lens and emergent light lens all adopt sapphire glass lens, and sapphire glass lens can be used as the form mirror at oil sump two ends, conveniently check situation in oil sump, and sapphire glass lens have good thermal characteristics, fabulous electrical specification and dielectric property, and anti-chemical corrosion, it is high temperature resistant, heat conduction is good, hardness is high, thoroughly infrared, and chemical stability is good.
3, in the present embodiment, incident light lens are provided with opaque aluminium film, described opaque aluminium center membrane position offers the viewing window for printing opacity, the directional light that light emitting diode I produces is injected in oil sump by viewing window, effectively can stop that all the other rays pass through lens are injected in oil sump, improve the detection efficiency of detection system, detect data more reliable.
4, in the present embodiment, photoelectric switching circuit is by being connected in parallel the first trans-impedance amplifier and the second trans-impedance amplifier, make the differential voltage V 1-V2 that its output photoelectric is changed, circuit provided by the invention efficiently utilizes supply voltage scope, improves speed and the interference free performance of photoelectric switching circuit.
5, in the present embodiment, when the first resistance and the second resistance are connected in parallel to the first electric capacity and the second electric capacity respectively, improve the filtering performance of photoelectric switching circuit.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the circuit diagram of constant-power power source circuit in the present invention;
Fig. 3 is the circuit diagram of photoelectric switching circuit in the present invention;
Fig. 4 is the circuit diagram of photoelectric switching circuit in another embodiment in the present invention;
Fig. 5 is the circuit diagram of signal processing circuit in the present invention;
Fig. 6 is the partial sectional view of oil sump in Fig. 1;
Wherein, Reference numeral is: 1-light emitting diode I, 2-incident light lens, 3-oil sump, 4-emergent light lens, 5-photodiode I, 6-photoelectric switching circuit, 7-constant-power power source circuit, 8-signal processing circuit, 9-fluorine-containing epoxy resin coating, 31-inlet pipe joint, 32-outlet pipe connection, the 33-the first reversal valve, the 34-the second reversal valve.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described:
Embodiment one
A kind of Oil Contamination in Hydraulic System detection system being provided with fluorine-containing epoxy resin coating, comprise the constant-power power source circuit 7, light emitting diode I1, oil sump 3, photodiode I5, photoelectric switching circuit 6 and the signal processing circuit 8 that connect successively, signal processing circuit 8 is connected with RS485 bus.Oil sump 3 two ends are respectively arranged with inlet pipe joint 31 for being communicated with hydraulic system return line and outlet pipe connection 32, this inlet pipe joint 31, by the first reversal valve 33 and the outlet of hydraulic system return line, makes the fluid in hydraulic system return line enter in oil sump 3 by the first reversal valve 33 and inlet pipe joint 31 and detects; This outlet pipe connection 32 is communicated with the entrance of hydraulic system return line by the second reversal valve 34, makes to be back in hydraulic system return line by outlet pipe connection 32 and the second reversal valve 34 through the fluid detected in oil sump 3.This first reversal valve 33 and the second reversal valve 34 are all electrically connected with control module, and control module controls the unlatching of the first reversal valve 33, second reversal valve 34 with closed, thus realizes the fluid in hydraulic system return line to be delivered in oil sump to detect.Oil sump 3 is provided with incident light lens 2 near light emitting diode I1 side, oil sump 3 is provided with emergent light lens near photodiode I5 side.Wherein incident light lens 2 and emergent light lens all adopt sapphire glass lens.Oil sump 3 madial wall being positioned at surveyed area place scribbles fluorine-containing epoxy resin coating 9, this fluorine-containing epoxy resin coating 9 is made up of fluorochemical surfactant (FSN), polyglycol (PEG), isophorone diisocyanate (IPDI) and epoxy resin (EP), its preparation process is: in the 250mL four-hole boiling flask that condenser pipe, thermometer, mechanical stirrer are housed, add IPDI and dibutyl tin laurate, PEG DMF dissolves, slowly be added drop-wise in IPDI at 70 DEG C, isothermal reaction 3h.Then add FSN, continue reaction 3h, obtain isocyanate-terminated polyurethane.E44 DMF joins in above-mentioned polyurethane solutions after diluting, and is warming up to 75 DEG C, sustained response 4h.Then add N, N-dimethyl benzylamine, after stirring, be poured on polyfluortetraethylene plate, the baking oven putting into 80 DEG C toasts 4h, makes the film that thickness is about 1 mm.Produce the phenomenon that fluid drips gathering when this fluorine-containing epoxy resin coating 9 can make fluid flow through the oil sump madial wall scribbling fluorine-containing epoxy resin coating, thus effectively prevent single fluid and drip the unconspicuous defect of the detection signal caused by oil sump surveyed area.The parallel beam that light emitting diode I1 sends through after oil sump 3 through incident light lens 2 is radiated on photodiode I5 produces electric signal through emergent light lens again, and electric signal is exported by RS485 bus after photoelectric switching circuit 6, signal processing circuit 8.
Control module controls the unlatching of the first reversal valve 33, second reversal valve 34 with closed, thus realizes the fluid in hydraulic system return line to be delivered in oil sump to detect, under the effect of constant-power power source circuit 7, the directional light of light emitting diode I1 generation power invariability is entered in oil sump 3 by incident light lens 2, if having particle to occur in oil sump 3, these particles will stop light and cause the reduction of luminous energy, emergent light lens lighting is passed through on photodiode I5 through the light after oil sump 3, because the particle in oil sump 3 has blocked some light, thus light intensity decays photodiode I5 received, by detecting the reduction degree being irradiated to luminous energy on photodiode I5 and the size and the content that succinctly calculate particle in oil sump 3, reliablely and stablely oil-liquid-solid particle pollution degree can be provided to detect data, and detect accurately fast in addition, oil sump 3 madial wall being positioned at surveyed area scribbles fluorine-containing epoxy resin coating 9, when fluid flows through oil sump 3 madial wall scribbling fluorine-containing epoxy resin coating 9, under the effect of fluorine-containing epoxy resin coating 9, fluid is assembled at surveyed area place, thus effectively prevent single fluid and drip the unconspicuous defect of the detection signal caused by oil sump surveyed area, that improves detection system adds survey sensitivity, detect data more reliable, accurately.
Embodiment two
On the basis of embodiment one, incident light lens 2 are provided with opaque aluminium film, and this opaque aluminium film can be fitted in incident light lens 2 both sides or wherein side, and opaque aluminium center membrane position offers the viewing window for printing opacity.By being provided with opaque aluminium film on incident light lens 2, described opaque aluminium center membrane position offers the viewing window for printing opacity, the directional light that light emitting diode I1 produces is injected in oil sump 3 by viewing window, effectively can stop that all the other rays pass through lens are injected in oil sump 3, improve the detection efficiency of detection system, detect data more reliable.
Embodiment three
On the basis of embodiment one or embodiment two, as described in Figure 3 in photoelectric switching circuit, A1, A2 are operational amplifier OP27, T1 is semiconductor laser diode, and T2 is light receiving tube, and T1 positive pole is connected with+14V direct supply by resistance R3, the direct ground connection of negative pole.Light receiving tube triode T2 collector is connected with the input end 2 of operational amplifier A 1, and emitter is connected with the input end 3 of operational amplifier A 1.Resistance R1 two ends are connected with output terminal 6 with the input end 2 of operational amplifier A 1 respectively, and resistance R4 connects the output terminal 6 of operational amplifier A 1 and the input end 3 of operational amplifier A 2.Resistance R2 one end is connected publicly with circuit, the other end is connected with the input end 2 of operational amplifier A 2, electric capacity C1 is connected with output terminal 6 with the input end 2 respectively at operational amplifier A 2 after potentiometer R5 parallel connection, the collector of the output terminal 6 of resistance R6 Linked operators amplifier A2 and the base stage triode T3 of triode T3 connects the direct supply of+14V, launches being input in passage of very signal.
Embodiment four
On the basis of embodiment one or embodiment two, as described in Figure 4 in photoelectric switching circuit, this photoelectric switching circuit comprises the first trans-impedance amplifier A1, and the positive ends of the first trans-impedance amplifier A1 is connected with the positive ends of the second trans-impedance amplifier A2, and simultaneously ground connection; The negative polarity end of the first trans-impedance amplifier A1 is connected with one end of the first resistance R1 with the anode of photodiode D respectively; The negative electrode of photodiode D is connected with one end of the second resistance R2 with the negative polarity end of the second trans-impedance amplifier A2 respectively; The output terminal of another termination first trans-impedance amplifier A1 of the first resistance R1; The output terminal of another termination second trans-impedance amplifier A2 of the second resistance R2; The differential voltage V1-V2 of the first trans-impedance amplifier A1 and the conversion of the second trans-impedance amplifier A2 output photoelectric.In addition, can also arrange the first electric capacity C1 and the second electric capacity C2, the first electric capacity C1 is connected in parallel the first resistance R1, and the second electric capacity C2 is connected in parallel the second resistance R2.
Embodiment five
On the basis of above-described embodiment, signal processing circuit 8 is divided into two-way, each own different effect.A following road is as threshold values Circuit tuning, and the current signal according to input carries out certain conversion process, exports six tunnel DC level (only drawing three tunnels in figure), as the comparative voltage of the operational amplifier in six channels that whole circuit exports.One tunnel of top is the major part of whole circuit, is input as AC signal.After the amplitude limit and isolation of operational amplifier A 3, delivered to by electric signal in six passages exported, each passage has different threshold voltages, and this threshold voltage is provided by following DC channel.After relatively, export pulse square wave to counter corresponding to each passage, output detections result.Wherein, U1 is the amplification channel of AC signal, U2 is the amplification sampling passage of direct current signal, and after amplifying, flowed through the threshold values comparer of flooring by the AC signal of U1, the threshold values of comparer arranges and obtained through slide rheostat dividing potential drop by the output signal of U2 amplifier.The threshold values that the particle of each particle diameter is corresponding different, just can be set to threshold voltage on the representative value corresponding with each particle diameter very easily by the intervention resistance arranging the slide rheostat on each road.U3 is the secondary circuit of the upper limit that AC signal exports, and in order to prevent the amplification to undesired signal, if this amplitude limiter circuit can improve the measuring accuracy of circuit, reduces error.U5, U6, U7 are comparator circuit.Wherein the setting value of threshold values passes through the dividing potential drop gained of DC level on slide rheostat of lower part, and threshold values is by setting the adjustment of slide rheostat resistance.
Embodiment six
On the basis of above-described embodiment, also be provided with control module, this control module can be the minimum system of single-chip microcomputer, DSP or FPGA/CPLD, or minimum system adding portion peripheral hardware forms, have high-precision a/d converter and certain computing, control ability, control module compartment of terrain sends ultraviolet light start pulse signal.This control module is electrically connected with light emitting diode I1, and this control module compartment of terrain sends start pulse signal, and the start pulse signal that this light emitting diode I1 reception control unit sends also correspondingly sends directional light directive oil sump 3 according to this start pulse signal.This control module is electrically connected with photodiode I5 or photoelectric switching circuit 6, electric signal corresponding to light transmitted through oil sump is delivered to control module by this photodiode I5 or photoelectric switching circuit 6, and this control module obtains the judged result of solid particle pollution degree in oil sump 3 according to the electric signal received.
Claims (5)
1. one kind is provided with the Oil Contamination in Hydraulic System detection system of fluorine-containing epoxy resin coating, it is characterized in that: comprise the constant-power power source circuit (7) connected successively, light emitting diode I(1), oil sump (3), photodiode I(5), photoelectric switching circuit (6) and signal processing circuit (8), the inlet pipe joint (31) of described oil sump (3), outlet pipe connection (32) correspondence is by the first reversal valve (33), second reversal valve (34) is communicated with hydraulic system return line, described first reversal valve (33), second reversal valve (34) is electrically connected with control module, described oil sump (3) is upper near light emitting diode I(1) side is provided with incident light lens (2), described oil sump (3) is upper near photodiode I(5) side is provided with emergent light lens (4), , described oil sump (3) madial wall scribbles fluorine-containing epoxy resin coating (9) at surveyed area place, described signal processing circuit (8) is connected with RS485 bus, described light emitting diode I(1 under the effect of constant-power power source circuit (7)) send power invariability parallel beam through incident light lens (2) through after oil sump (3) again through emergent light lens (4) and be radiated at photodiode I(5) on produce electric signal, described electric signal is exported by RS485 bus after (8) through photoelectric switching circuit (6), signal processing circuit.
2. be provided with the Oil Contamination in Hydraulic System detection system of fluorine-containing epoxy resin coating as claimed in claim 1, it is characterized in that: described incident light lens (2) and emergent light lens (4) are sapphire glass lens.
3. be provided with the Oil Contamination in Hydraulic System detection system of fluorine-containing epoxy resin coating as claimed in claim 2, it is characterized in that: described incident light lens (2) are provided with opaque aluminium film, described opaque aluminium center membrane position offers the viewing window for printing opacity.
4. be provided with the Oil Contamination in Hydraulic System detection system of fluorine-containing epoxy resin coating as claimed in claim 1, it is characterized in that: described photoelectric switching circuit (6) comprising:
First trans-impedance amplifier (A1), the positive ends of described first trans-impedance amplifier (A1) is connected with the positive ends of the second trans-impedance amplifier (A2), and simultaneously ground connection,
The negative polarity end of described first trans-impedance amplifier (A1) is connected with one end of the first resistance (R1) with the anode of photodiode (D) respectively; The negative electrode of described photodiode (D) is connected with one end of the second resistance (R2) with the negative polarity end of described second trans-impedance amplifier (A2) respectively; The output terminal of the first trans-impedance amplifier (A1) described in another termination of described first resistance (R1); The output terminal of the second trans-impedance amplifier (A2) described in another termination of described second resistance (R2); The differential voltage V1-V2 of described first trans-impedance amplifier (A1) and the conversion of described second trans-impedance amplifier (A2) output photoelectric.
5. be provided with the Oil Contamination in Hydraulic System detection system of fluorine-containing epoxy resin coating as claimed in claim 4, it is characterized in that: the first electric capacity (C1) and the second electric capacity (C2), described first electric capacity (C1) is connected in parallel described first resistance (R1), and described second electric capacity (C2) is connected in parallel described second resistance (R2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410696489.0A CN104502312A (en) | 2014-11-26 | 2014-11-26 | Hydraulic system oil pollution degree detection system provided with fluorinated epoxy resin coating layer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410696489.0A CN104502312A (en) | 2014-11-26 | 2014-11-26 | Hydraulic system oil pollution degree detection system provided with fluorinated epoxy resin coating layer |
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| CN104502312A true CN104502312A (en) | 2015-04-08 |
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