CN117029969A - High-viscosity lubricating oil, sealing oil flow and abrasive particle on-line detection method and device - Google Patents
High-viscosity lubricating oil, sealing oil flow and abrasive particle on-line detection method and device Download PDFInfo
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- 239000002245 particle Substances 0.000 title claims abstract description 94
- 239000003921 oil Substances 0.000 title claims abstract description 90
- 239000010687 lubricating oil Substances 0.000 title claims abstract description 85
- 238000001514 detection method Methods 0.000 title claims abstract description 83
- 238000007789 sealing Methods 0.000 title claims abstract description 83
- 238000012360 testing method Methods 0.000 claims abstract description 48
- 238000000034 method Methods 0.000 claims abstract description 32
- 239000006061 abrasive grain Substances 0.000 claims abstract description 16
- 238000012545 processing Methods 0.000 claims description 22
- 239000003990 capacitor Substances 0.000 claims description 21
- 230000003287 optical effect Effects 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims description 9
- 239000000314 lubricant Substances 0.000 claims description 8
- 238000005259 measurement Methods 0.000 abstract description 22
- 238000010586 diagram Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000005294 ferromagnetic effect Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
- G01F25/11—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters using a seal ball or piston in a test loop
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The device comprises a detection module, a test table and a test tube arranged on the test table; the test tube comprises a volume tube and a transparent tube connected with the volume tube; the detection module comprises a flow detection module arranged on the volume tube and an abrasive particle detection module arranged on the transparent tube, and a flow meter to be detected positioned on the test tube is arranged at the downstream of the volume tube; the flow detection module and the abrasive grain detection module are respectively connected with the processor, and the processor transmits the received flow signals and abrasive grain signals to the display module. The device can realize the on-line measurement of high-viscosity lubricating oil or sealing oil, has high measurement accuracy, is suitable for on-site detection, and ensures the accuracy while being economical; the method can maximally meet the magnitude tracing of large sites such as aerospace, petrochemical industry, ships and the like.
Description
Technical Field
The application belongs to the technical field of detection of lubricating oil, sealing oil flow and abrasive particles, and particularly relates to a method and a device for detecting high-viscosity lubricating oil, sealing oil flow and abrasive particles on line.
Background
Lubricating oil and sealing oil are indispensable in mechanical equipment; in addition to the lubrication and sealing functions, the state of the lubricating oil also reflects the running state of the equipment to a certain extent. The detection of the flow of lubricant and abrasive particles is therefore related to the operation of the whole system. The flow meter can detect the flow of lubricating oil and sealing oil, but after the flow meter is used for a period of time, errors can occur, but many devices cannot detach the flow meter for inspection, so that the flow detection of the lubricating oil or the sealing oil can be influenced to a certain extent; in addition, detection of abrasive particles is required to ensure detection of the liquid in use. Laboratory detection is high in cost and hysteresis, so that the requirements for online detection of flow and abrasive particles of lubricating oil and sealing oil are urgent.
The presently disclosed methods for detecting lubricating oil, seal oil flow and abrasive particles are somewhat static or sent to a laboratory for detection. This not only affects production, but also is costly and does not well reflect the effects of lubricating oil on the system in the operating conditions of the machine, and sometimes it is impractical to stop the running equipment, and long-term undetectable or inaccurate detection is likely to cause mechanical damage or even major accidents. The related data show that the safety accidents caused by the faults of the aero-engines generated by lubrication account for about 80% of the aviation safety accidents.
For abrasive particle measurement, the current situation is:
the bulletin number is: the patent of US7112973B2[ P ] discloses a method for detecting abrasive particles by adopting a resistance principle, and the method can be used for measuring the abrasive particles, but the method can only roughly measure the number of ferromagnetic abrasive particles, cannot obtain specific information of single ferromagnetic abrasive particles, and is greatly limited in practical use.
The proposal is based on the electromagnetic induction principle, and in the practical use process, it is found that only ferromagnetic abrasive particles larger than 100 mu m and nonferromagnetic abrasive particles larger than 400 mu m can be monitored, the monitoring precision is lower, and the applicability to occasions with high precision requirements is lower.
In addition, the scheme is mainly aimed at lubricating oil or sealing oil with low viscosity, and the use effect is poor when the lubricating oil or sealing oil with high viscosity (more than 20000 mPa/s) is encountered.
For flow measurement, the current situation is:
lubricating or sealing oils are typically non-newtonian fluids that cannot be followed by flow detection methods. Because the viscosity-temperature curve of the lubricating oil or the sealing oil does not follow a linear relationship, if an off-line detection or inspection method is adopted, the flow tracing is inaccurate.
At present, most of the detection methods of the flow of the lubricating oil are as follows: the mass method and the flow meter method, when the mass method is adopted to detect the flow of lubricating oil or sealing oil, the impact force can cause inaccurate measurement. The flow meter method is to install a flow meter on a pipeline, and the flow of the lubricating oil is known through the reading of the flow meter, and the method has the following defects: when the flow meter is used for measuring the non-Newtonian body, after the flow meter is used for a period of time, a larger error occurs in the flow meter, at the moment, the flow meter needs to be calibrated by using a standard meter, and if the flow meter is calibrated, the actual working environment cannot be simulated under experimental conditions, so that the problem of lower accuracy is caused.
Meanwhile, in the prior art, the measurement of lubricating oil and sealing oil cannot be integrated on one online measurement line, and two pipelines are measured, so that on one hand, the measurement pipeline is lengthened and is not close to a production link, and the accuracy of a measurement result is affected; on the other hand, the detection cost is increased.
Therefore, a method for on-line detection of the flow rate of high viscosity lubricating oil and sealing oil and abrasive grains is needed.
Disclosure of Invention
The application aims to provide the high-viscosity lubricating oil and sealing oil flow and abrasive particle on-line detection method and device which are convenient to realize and high in detection accuracy.
In order to solve the technical problems, the application provides the following technical scheme: the device for detecting the flow of the high-viscosity lubricating oil, the sealing oil and the abrasive particles on line comprises a detection module, a test table and a test tube arranged on the test table; the test tube comprises a volume tube and a transparent tube connected with the volume tube; the detection module comprises a flow detection module arranged on the volume tube and an abrasive particle detection module arranged on the transparent tube, and a flow meter to be detected positioned on the test tube is arranged at the downstream of the volume tube; the flow detection module and the abrasive grain detection module are respectively connected with the processor, and the processor transmits the received flow signals and abrasive grain signals to the display module.
The flow detection module comprises a power source and a piston; the power source drives the piston to be arranged in the volume pipe in a sliding way; the processor outputs a signal to control the power source to work; the processor receives a distance of movement of the piston.
The flow detection module further comprises a grating sensor, and the grating sensor collects movement signals of the piston; the grating sensor transmits the received movement signal to the processor.
The abrasive particle detection module comprises parallel light beams arranged towards the transparent tube and an optical processing circuit arranged corresponding to the parallel light beams, and a signal output end of the optical processing circuit is connected with a signal input end of the processor.
The optical processing circuit comprises a photoelectric conversion circuit and an amplifying circuit; the signal output end of the photoelectric conversion circuit is connected with the signal input end of the amplifying circuit, and the amplifying circuit is connected with the signal input end of the processor.
The photoelectric conversion circuit comprises an operational amplifier, a first photodiode, a second photodiode, a first capacitor, a first resistor, a filter capacitor, a second capacitor and a second resistor;
the first photodiode and the second photodiode are connected in parallel, and the positive electrodes of the first photodiode and the second photodiode are grounded; the negative electrodes of the two are connected with the inverting input end of the operational amplifier; the non-inverting input end of the operational amplifier is grounded; the output end of the operational amplifier is connected with the inverting input end of the operational amplifier through a first capacitor; the output end of the operational amplifier is connected with the first resistor; the second end of the first resistor is grounded through a filter capacitor; meanwhile, the second end of the first resistor is connected with the inverting input end of the operational amplifier through a second capacitor and a second resistor which are connected in parallel.
The amplifying circuit comprises a low-noise operational amplifier, a low-noise instrument operational amplifier, a first grounding resistor, a second grounding resistor and a third capacitor;
the non-inverting input end of the low-noise operational amplifier is connected with the second end of the first resistor; the inverting input end of the low-noise operational amplifier is grounded through a first grounding resistor; meanwhile, the inverting input end of the low-noise operational amplifier is also connected with the output end of the low-noise operational amplifier through a second resistor; the output end of the low-noise operational amplifier is connected with the non-inverting input end of the low-noise instrument operational amplifier through a third capacitor; the inverting input of the low noise instrumentation operational amplifier is grounded through a second grounding resistor.
The online detection method for the high-viscosity lubricating oil, the sealing oil flow and the abrasive particles by using the device comprises the following steps in sequence:
1) Connecting the test tube to a circulation loop of high-viscosity lubricating oil or sealing oil, wherein the high-viscosity lubricating oil or sealing oil enters the test tube;
2) Starting a power source; the power source drives the piston to push out high-viscosity lubricating oil or sealing oil from the test tube, and the high-viscosity lubricating oil or sealing oil flows through the flow meter to be tested, and the reading of the flow meter to be tested is checked to be Qv;
3) Calculating the standard flow of the high-viscosity lubricating oil or sealing oil by the formula (1):
qs=v/Δt formula (1)
Wherein V is the volume of high-viscosity lubricating oil or sealing oil pushed out by the piston; t is the time of piston movement;
4) Calculating the error of the flow meter to be detected through a formula (2):
S=qv-Qs formula (2)
5) The high-viscosity lubricating oil or sealing oil flows through a flow meter to be detected, then enters the transparent pipe, and returns to the circulation loop from the transparent pipe;
6) The parallel light beams enter the light processing circuit after passing through the transparent tube;
7) The optical processing circuit converts the optical signal into an electrical signal;
8) Judging whether abrasive particles exist in the high-viscosity lubricating oil or the sealing oil according to the electric signals obtained in the step 7);
the judging method comprises the following steps: if the electric signal is a constant voltage, no abrasive particles exist in the high-viscosity lubricating oil or sealing oil, so that the detection process is completed;
if negative pulses exist in the electric signals, the high-viscosity lubricating oil or the sealing oil has abrasive particles, and the step (9) is carried out;
(9) The number and diameter of the abrasive grains were calculated:
the calculation method of the number of the abrasive particles comprises the following steps: calculating the number of negative pulses in the electric signal, wherein the number of negative pulses in the electric signal is the same as the number of abrasive particles;
the calculation method of the abrasive particle diameter is that the abrasive particle diameter is calculated according to the formula (3)
Wherein δE is a negative pulse voltage value; d is the equivalent diameter of the abrasive particles; a is the cross-sectional area of the parallel beam; e (E) 0 Is the voltage value of the electric signal.
The calculation method of the volume of the high-viscosity lubricating oil or sealing oil pushed out by the piston comprises the following steps: measuring the moving distance of the piston, and obtaining the volume according to a formula (4);
V＝πr 2 h formula (4)
Wherein h is the moving distance of the piston; r is the radius of the cross section of the volume tube.
And displaying the standard flow of the high-viscosity lubricating oil or sealing oil, the error of the flow meter to be detected and the number of abrasive particles, and the radius of the abrasive particles on a display module.
Through the technical scheme, the application has the following technical effects: 1. the device can realize the on-line measurement of high-viscosity lubricating oil or sealing oil, has high measurement accuracy, is suitable for on-site detection, and ensures the accuracy while being economical; the method can maximally meet the magnitude tracing of large sites such as aerospace, petrochemical industry, ships and the like; 2. the test bench can be lifted according to the site condition, so that the support of the detection module is realized; 3. the set flow detection and abrasive particle detection can be realized in one system, so that the problem of detection accuracy reduction caused by too many procedures of a sample to be detected on site is avoided; 4. the flow and abrasive particle online measurement method of the high-viscosity lubricating oil or sealing oil can realize simultaneous measurement of flow and abrasive particles, has high measurement accuracy, and is more fit for industrial sites; meanwhile, the implementation is convenient, and the test result is not easily influenced by the outside; meanwhile, the test result has no hysteresis; and the detection without stopping the machine is realized.
Drawings
FIG. 1 is a block diagram of an apparatus according to the present application;
FIG. 2 is a schematic diagram of a test bench;
FIG. 3 is a schematic diagram of a photoelectric conversion circuit;
FIG. 4 is an enlarged schematic circuit diagram;
FIG. 5 is a schematic diagram of a processor circuit;
FIG. 6 is a flow chart of the method of the present application;
FIG. 7 is a schematic view of a monitoring area without abrasive particles;
FIG. 8 is a schematic view of abrasive particles in a monitored area.
Detailed Description
High viscosity lubricating oil, sealing oil flow and abrasive grain on-line measuring device, it is notable that: the application is directed to lubricating or sealing oils having a viscosity of more than 20000 mPa/s.
As shown in fig. 1, the device comprises a test bench 1 and a detection module, when in use, the test bench 1 is lifted to a circulation pipeline of lubricating oil or sealing oil, and the lubricating oil or sealing oil is directly detected by the detection module along with the internal circulation of the lubricating oil or sealing oil in the circulation pipeline, so that dynamic measurement is realized, the actual situation is more attached, and the accuracy of the detection result is high.
The structure of the test bench 1 is defined as follows: as shown in fig. 2, the test bench 1 comprises a base 13 and a working table surface positioned above the base 13, and a level meter 11 is arranged on the working table surface; the bottom of the base 13 is provided with a moving wheel 14; a hydraulic rod 12 is connected between the working table surface and the base 13; in this embodiment, the number of the hydraulic rods 12 is 3, and the 3 hydraulic rods 12 are distributed in a triangle shape, so that the stability of connection between the working table surface and the base 13 is improved, and the stable rising of the working table surface is also ensured. In order to ensure the accuracy of the detection result, a level meter 11 is arranged on the working table surface, so that the level of the working table surface is ensured, and the detection result is prevented from being influenced by the outside.
As shown in fig. 3 to 5, the test stand 1 is provided with a test tube, and the withstand voltage value of the test tube is: 3.5Mpa; when the device is implemented, the test tube is used for being connected with the circulating pipeline, lubricating oil or sealing oil in the circulating pipeline enters from one end of the test tube and enters into the circulating pipeline again from the other end of the test tube, so that on one hand, the link of heating the lubricating oil or sealing oil is omitted, the mobility of a sample to be detected is ensured, the online measurement is realized, and the detection result is more accurate.
In this embodiment, the test tube comprises a volume tube 5 and a transparent tube 7 connected to the volume tube 5.
The detection module comprises a flow detection module arranged on the volume tube 5 and an abrasive particle detection module arranged on the transparent tube 7, and a flow meter 6 to be detected positioned on the test tube is arranged at the downstream of the volume tube 5; the flow detection module and the abrasive grain detection module are respectively connected with the processor, and the processor transmits the received flow signals and abrasive grains to the display module.
Therefore, the flow detection module detects the standard flow of the lubricating oil or the sealing oil, a flow reading exists on the to-be-detected flow meter 6, and the error of the to-be-detected flow meter 6 can be obtained according to the relation between the flow reading and the standard flow. After the flow rate measurement is completed, the lubricating oil or sealing oil enters the transparent tube 7 for abrasive grain detection.
The flow detection module transmits the received flow signal and the received abrasive particle signal to the processor, and the flow signal and the abrasive particle signal are displayed on the display module through the processor.
In this embodiment, the processor uses a single-chip microcomputer with a model number of MSP430F 5529.
The flow detection module and the abrasive particle detection module are specifically described below:
the flow detection module is used for realizing flow measurement, wherein the module comprises a power source and a piston 4; the power source drives the piston 4 to be arranged in the volume pipe 5 in a sliding way.
The power source comprises a motor 2, a screw rod 3 and a nut; an output shaft of the motor 2 is connected with a screw rod 3, a nut is in threaded connection with the screw rod 3, and the nut is connected with a piston 4.
When the device works, the motor 2 rotates, so that the screw rod 3 is driven to rotate, and along with the rotation of the screw rod 3, the nut drives the piston 4 to move along the length direction of the volume pipe 5; along with the movement of the piston 4, the lubricating oil or sealing oil in the volume pipe 5 comes out of the volume pipe 5 and enters the flowmeter 6 to be detected.
The embodiment is that an external force source drives high-viscosity lubricating oil or sealing oil to move, so that the phenomenon that the viscosity is too large to measure is avoided.
Because the motor 2 needs to rotate in the working process of the power source, in order to realize the control of the working of the motor 2, the singlechip U1 outputs a signal to control the working of the power source, and the realization mode is as follows: the signal output end of the singlechip U1 is connected with a motor driving chip U6, and the motor driving chip U6 drives the motor 2 to work. Wherein, motor drive chip U6 can select for use: L298N.
The signal output end (pins P7.6 and P7.5) of the singlechip U1 is connected with the signal input end (pins IN1 and IN 2) of the motor driving chip U6; the signal output terminals (pins OUT1, OUT 2) of the motor drive chip U6 are connected to the control terminals (pins a, B) of the motor 2. The singlechip U1 outputs signals to the motor driving chip U6, and the motor driving chip U6 drives the motor 2 to rotate.
Meanwhile, a grating sensor (the model is SMW-GSC, the manufacturer is Style-Navigator) is connected to the signal input end of the singlechip U1, and the grating sensor collects the moving distance of the piston 4.
The signal output end (pin OUT) of the grating displacement sensor is connected with the signal input end (pin P7.7) of the single-chip microcomputer U1 through a terminal J1, so that the grating sensor transmits the received moving signal to the single-chip microcomputer U1.
As the motor 2 operates, the piston 4 pushes out the lubricating oil or sealing oil in the volume tube 5; since the moving distance and moving time of the piston 4 are fixed and the inner diameter of the volume tube 5 is known, a standard flow rate of the lubricating oil or the sealing oil can be obtained.
After the part of lubricating oil or sealing oil enters the to-be-detected flow meter 6, a reading is arranged on the to-be-detected flow meter 6, and the reading is the flow of the lubricating oil or sealing oil detected by the to-be-detected flow meter 6; and comparing the flow with the standard flow to obtain the error of the flow meter 6 to be detected.
The lubricating oil or sealing oil continues to move from the flow meter 6 to be inspected and enters the transparent tube 7. In this embodiment, the transparent tube 7 is made of organic glass. After entering the transparent tube 7, the abrasive particle detection module detects abrasive particles in the lubricating oil or the sealing oil.
The abrasive particle detection module includes a parallel light beam 8 disposed towards the transparent tube 7 and a light processing circuit 9 disposed corresponding to the parallel light beam 8, and the parallel light beam 8 is received by the light processing circuit 9 after passing through the transparent tube 7. The signal output end of the optical processing circuit 9 is connected with the signal input end of the singlechip U1.
Wherein the optical processing circuit 9 is used for realizing photoelectric conversion and amplifying the converted electric signal; the light processing circuit 9 includes a photoelectric conversion circuit and an amplifying circuit; the signal output end of the photoelectric conversion circuit is connected with the signal input end of the amplifying circuit, and the amplifying circuit is connected with the signal input end of the singlechip U1.
The photoelectric conversion circuit comprises an operational amplifier U2, a first photodiode D1 and a second photodiode D2; the first photodiode D1 and the second photodiode D2 are connected in parallel, and the anodes of the first photodiode D1 and the second photodiode D2 are grounded; the negative electrodes of the two are connected with the inverting input terminal (-) of the operational amplifier U2.
The noninverting input end (+) of the operational amplifier U2 is grounded; the output end of the operational amplifier U2 is connected with the inverting input end (-) of the operational amplifier U2 through a first capacitor cf 1; meanwhile, the output end of the operational amplifier U2 is connected with a first resistor R; the second end of the first resistor R is grounded through a filter capacitor C; in addition, the second end of the first resistor R is connected to the inverting input terminal (-) of the operational amplifier U2 through the second capacitor cf2 and the second resistor Rf connected in parallel.
The amplifying circuit includes a low noise operational amplifier U3 (model AD 4829), a low noise instrumentation operational amplifier U4 (model INA 103).
The noninverting input end (+) of the low-noise operational amplifier U3 is connected with the second end of the first resistor R; the inverting input terminal (-) of the low-noise operational amplifier U3 is grounded through a first grounding resistor R3; the inverting input (-) of the low noise operational amplifier U3 is also connected to the output of the low noise operational amplifier U3 through the first connection resistor R2.
The output end of the low-noise operational amplifier U3 is connected with the non-inverting input end (+) of the low-noise instrument operational amplifier U4 through a third capacitor C3; the inverting input terminal (-) of the low noise instrument operational amplifier U4 is connected with a second grounding resistor R5. The output end of the low noise instrument operational amplifier U4 is connected with the signal input end (pin P7.4) of the singlechip U1
The second end of the third capacitor C3 is connected with a third grounding resistor R4 and an adjustable resistor RW, and the second end of the third grounding resistor R4 is connected with the first end of the adjustable resistor RW; the second end of the adjustable resistor RW is connected with the second end of the second grounding resistor R5, and meanwhile, the adjustable end of the adjustable resistor RW is grounded; the amplification factor can be adjusted by the adjustable resistor RW.
The micro electric signal when the abrasive particles pass through can be amplified by the amplifying circuit, the signal input line in the embodiment adopts a shielding cable which is as short as possible, and the circuit board adopts a high-insulation circuit board with small leakage current.
When the single chip microcomputer U1 works, the received standard flow information, abrasive particle number and abrasive particle size information are displayed on the display module.
The display module comprises a display screen (the model is LED 1602), and the standard flow information, the abrasive particle number and the abrasive particle size are three data volumes; therefore, three display screens are required, and only one of the three display screens is displayed in this embodiment.
The signal input end (pins D0-D7) of the display screen is connected with the signal output end (pins P6.4-P7.3) of the singlechip U1.
Meanwhile, the singlechip U1 also transmits the received standard flow information, the abrasive particle number and the abrasive particle size information to the upper computer, and in the embodiment, the upper computer is taken as an example for explanation.
The single-chip microcomputer U1 is connected with a 232 chip (the model is MAX 232), specifically, serial ports (pins P4.5 and P4.4) of the single-chip microcomputer U1 are respectively connected with R0OUT and T0IN pins of the 232 chip; and the T0OUT and the R0IN of the 232 chip are connected with a No. 2 hole and a No. 3 hole of the serial port connector DB of the upper computer.
When the single-chip microcomputer works, the single-chip microcomputer outputs signals to the motor, and the motor drives the screw rod to rotate, so that the piston moves in the volume tube for a set distance; according to the moving distance of the piston, the singlechip obtains the flow of the corresponding liquid; meanwhile, comparing the flow value of the flow meter to be detected; the liquid enters the transparent tube, the light of the parallel light beam enters the light processing circuit after passing through the transparent tube, an electric signal is formed in the light processing circuit and is transmitted to the singlechip, and the singlechip judges whether abrasive particles exist and the number of the abrasive particles according to whether the electric signal has pulses. The singlechip transmits standard flow and abrasive particle quantity information to the display screen for display, and simultaneously transmits the information to the upper computer for storage and display.
The device can realize the on-line measurement of high-viscosity lubricating oil or sealing oil, has high measurement accuracy, is suitable for on-site detection, and ensures the accuracy while being economical; the method can maximally meet the magnitude tracing of large sites such as aerospace, petrochemical industry, ships and the like.
The embodiment also discloses an online detection method of high-viscosity lubricating oil, sealing oil flow and abrasive particles by using the device, as shown in fig. 6-7, the method sequentially comprises the following steps:
1) And connecting the test tube to a circulation loop of high-viscosity lubricating oil or sealing oil, wherein the high-viscosity lubricating oil or sealing oil enters the test tube. In this embodiment, the withstand voltage value of the test tube is: 3.5Mpa.
In addition, leveling the working table surface is needed before the step 1), the levelness meets 2 poles, and the error is within 15 mu m.
2) Starting a power source; the power source drives the piston to push out high-viscosity lubricating oil or sealing oil from the test tube, and the high-viscosity lubricating oil or sealing oil flows through the flow meter to be tested, and the reading of the flow meter to be tested is checked to be Qv.
In this embodiment, the power source is a motor, and the processor outputs a signal to enable the motor to work, so as to drive the piston to walk for a set distance.
3) Calculating the standard flow of the high-viscosity lubricating oil or sealing oil by the formula (1):
qs=v/Δt formula (1)
Wherein V is the volume of high-viscosity lubricating oil or sealing oil pushed out by the piston; t is the time of piston movement;
the calculation method of the volume of the high-viscosity lubricating oil or sealing oil pushed out by the piston comprises the following steps: measuring the moving distance of the piston, and obtaining the volume according to a formula (4);
V＝πr 2 h formula (4)
Wherein h is the moving distance of the piston; r is the radius of the cross section of the volume tube. In the embodiment, the moving distance of the piston can be obtained through the grating sensor, so that the accuracy is high and the acquisition is convenient.
4) Calculating the error of the flow meter to be detected through a formula (2):
S=qv-Qs formula (2)
Displaying the obtained standard flow and the error of the flow meter to be detected on a display module; at the same time, the value is also transmitted to the host computer.
5) The high-viscosity lubricating oil or sealing oil flows through a flow meter to be detected, then enters the transparent pipe 7, and returns to the circulation loop from the transparent pipe 7; therefore, the on-line detection of the high-viscosity lubricating oil or sealing oil is realized, the dynamic measurement is ensured, meanwhile, the problem that the testing environment is changed after sampling is avoided, the accuracy of the testing result is effectively improved, and the testing result is more suitable for a working site.
6) In the process that the high-viscosity lubricating oil or sealing oil passes through the transparent tube 7, the parallel light beams pass through the transparent tube 7 and then enter the light processing circuit;
7) The optical processing circuit converts the optical signal into an electrical signal and amplifies the electrical signal. In this embodiment, the optical processing circuit converts an optical signal into an electrical signal and amplifies the electrical signal, and uses a photoelectric conversion circuit and an amplifying circuit.
8) Judging whether abrasive particles exist in the high-viscosity lubricating oil or the sealing oil according to the electric signals obtained in the step 7);
the judging method comprises the following steps:
when the electric signal is a constant voltage, no abrasive particles exist in the high-viscosity lubricating oil or the sealing oil, so that the detection process is completed;
when negative pulses exist in the electric signals, the high-viscosity lubricating oil or the sealing oil has abrasive particles, and the step (9) is carried out;
in this embodiment, when the monitoring area has no abrasive particles, all the parallel light beams are collected on the optical processing circuit, and when the monitoring area has abrasive particles, the parallel light beams are blocked by the abrasive particles, and the optical processing circuit estimates the size and concentration of the abrasive particles by measuring the change of light. The application can measure the diameter of the abrasive particles to be less than or equal to 5 mu m, and the precision is far higher than that of the test methods adopting other principles such as an electromagnetic method, an acoustic method and the like.
(9) The number and diameter of the abrasive grains were calculated:
the calculation method of the number of the abrasive particles comprises the following steps: and calculating the number of negative pulses in the electric signal, wherein the number of the negative pulses in the electric signal is the same as the number of the abrasive particles. When particles pass through the detection area one by one, one pulse signal corresponds to one particle, so that the size and the number of the particles in the liquid to be detected can be obtained by carrying out amplitude discrimination and counting on all pulse signals.
The calculation method of the abrasive particle diameter is that the abrasive particle diameter is calculated according to the formula (3)
Wherein δE is a negative pulse voltage value; d is the equivalent diameter of the abrasive particles; a is the cross-sectional area of the parallel beam; e (E) 0 Is the voltage value of the electric signal.
And displaying the number of abrasive particles of the high-viscosity lubricating oil or the sealing oil on a display module, and transmitting the abrasive particle radius to an upper computer.
The flow and abrasive particle online measurement method of the high-viscosity lubricating oil or sealing oil can realize simultaneous measurement of flow and abrasive particles, has high measurement accuracy, and is more fit for industrial sites; meanwhile, the method is convenient to realize, and the test result is not easily influenced by the outside.
Claims (10)
1. High viscosity lubricating oil, sealing oil flow and grit on-line measuring device, its characterized in that: the test tube comprises a detection module, a test table and a test tube arranged on the test table; the test tube comprises a volume tube and a transparent tube connected with the volume tube; the detection module comprises a flow detection module arranged on the volume tube and an abrasive particle detection module arranged on the transparent tube, and a flow meter to be detected positioned on the test tube is arranged at the downstream of the volume tube; the flow detection module and the abrasive grain detection module are respectively connected with the processor, the processor transmits the received flow signal and the abrasive grain signal to the display module, and meanwhile, the processor transmits the received flow signal and the abrasive grain signal to the upper computer.
2. The high viscosity lubricant, seal oil flow and abrasive particle on-line detection device of claim 1, wherein: the flow detection module comprises a power source and a piston; the power source drives the piston to be arranged in the volume pipe in a sliding way; the processor outputs a signal to control the power source to work; the processor receives a distance of movement of the piston.
3. The high viscosity lubricant, seal oil flow and abrasive particle on-line detection device according to claim 2, wherein: the flow detection module further comprises a grating sensor, and the grating sensor collects movement signals of the piston; the grating sensor transmits the received movement signal to the processor.
4. The high viscosity lubricant, seal oil flow and abrasive particle on-line detection device according to claim 3, wherein: the abrasive particle detection module comprises parallel light beams arranged towards the transparent tube and an optical processing circuit arranged corresponding to the parallel light beams, and a signal output end of the optical processing circuit is connected with a signal input end of the processor.
5. The high viscosity lubricant, seal oil flow and abrasive particle on-line testing device of claim 4, wherein: the optical processing circuit comprises a photoelectric conversion circuit and an amplifying circuit; the signal output end of the photoelectric conversion circuit is connected with the signal input end of the amplifying circuit, and the amplifying circuit is connected with the signal input end of the processor.
6. The high viscosity lubricant, seal oil flow and abrasive particle on-line testing device of claim 5, wherein: the photoelectric conversion circuit comprises an operational amplifier, a first photodiode, a second photodiode, a first capacitor, a first resistor, a filter capacitor, a second capacitor and a second resistor;
the first photodiode and the second photodiode are connected in parallel, and the positive electrodes of the first photodiode and the second photodiode are grounded; the negative electrodes of the two are connected with the inverting input end of the operational amplifier; the non-inverting input end of the operational amplifier is grounded; the output end of the operational amplifier is connected with the inverting input end of the operational amplifier through a first capacitor; the output end of the operational amplifier is connected with the first resistor; the second end of the first resistor is grounded through a filter capacitor; meanwhile, the second end of the first resistor is connected with the inverting input end of the operational amplifier through a second capacitor and a second resistor which are connected in parallel.
7. The high-viscosity lubricating oil, sealing oil flow rate and abrasive grain on-line detection device according to claim 5 or 6, wherein: the amplifying circuit comprises a low-noise operational amplifier, a low-noise instrument operational amplifier, a first grounding resistor, a second grounding resistor and a third capacitor;
the non-inverting input end of the low-noise operational amplifier is connected with the second end of the first resistor; the inverting input end of the low-noise operational amplifier is grounded through a first grounding resistor; meanwhile, the inverting input end of the low-noise operational amplifier is also connected with the output end of the low-noise operational amplifier through a second resistor; the output end of the low-noise operational amplifier is connected with the non-inverting input end of the low-noise instrument operational amplifier through a third capacitor; the inverting input of the low noise instrumentation operational amplifier is grounded through a second grounding resistor.
8. The method for on-line detection of high-viscosity lubricating oil, sealing oil flow and abrasive particles by using the device of claim 1, which is characterized in that: the method sequentially comprises the following steps:
1) Connecting the test tube to a circulation loop of high-viscosity lubricating oil or sealing oil, wherein the high-viscosity lubricating oil or sealing oil enters the test tube;
2) Starting a power source; the power source drives the piston to push out high-viscosity lubricating oil or sealing oil from the test tube, and the high-viscosity lubricating oil or sealing oil flows through the flow meter to be tested, and the reading of the flow meter to be tested is checked to be Qv;
3) Calculating the standard flow of the high-viscosity lubricating oil or sealing oil by the formula (1):
qs=v/Δt formula (1)
Wherein V is the volume of high-viscosity lubricating oil or sealing oil pushed out by the piston; t is the time of piston movement;
4) Calculating the error of the flow meter to be detected through a formula (2):
S=qv-Qs formula (2)
5) The high-viscosity lubricating oil or sealing oil flows through a flow meter to be detected, then enters the transparent pipe, and returns to the circulation loop from the transparent pipe;
6) The parallel light beams enter the light processing circuit after passing through the transparent tube;
7) The optical processing circuit converts the optical signal into an electrical signal;
8) Judging whether abrasive particles exist in the high-viscosity lubricating oil or the sealing oil according to the electric signals obtained in the step 7);
the judging method comprises the following steps: if the electric signal is a constant voltage, no abrasive particles exist in the high-viscosity lubricating oil or sealing oil, so that the detection process is completed;
if negative pulses exist in the electric signals, the high-viscosity lubricating oil or the sealing oil has abrasive particles, and the step (9) is carried out;
(9) The number and diameter of the abrasive grains were calculated:
the calculation method of the number of the abrasive particles comprises the following steps: calculating the number of negative pulses in the electric signal, wherein the number of negative pulses in the electric signal is the same as the number of abrasive particles;
the calculation method of the abrasive particle diameter is that the abrasive particle diameter is calculated according to the formula (3)
Wherein δE is a negative pulse voltage value; d is the equivalent diameter of the abrasive particles; a is the cross-sectional area of the parallel beam; e (E) 0 Is the voltage value of the electric signal.
9. The high viscosity lubricant, seal oil flow and abrasive particle on-line detection method of claim 8, wherein: the calculation method of the volume of the high-viscosity lubricating oil or sealing oil pushed out by the piston comprises the following steps: measuring the moving distance of the piston, and obtaining the volume according to a formula (4);
V＝πr 2 h formula (4)
Wherein h is the moving distance of the piston; r is the radius of the cross section of the volume tube.
10. The high viscosity lubricant, seal oil flow and abrasive particle on-line detection method of claim 9, wherein: and displaying the standard flow of the high-viscosity lubricating oil or sealing oil, the error of the flow meter to be detected and the number of abrasive particles, and the radius of the abrasive particles on a display module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310985885.4A CN117029969A (en) | 2023-08-07 | 2023-08-07 | High-viscosity lubricating oil, sealing oil flow and abrasive particle on-line detection method and device |
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| CN202310985885.4A CN117029969A (en) | 2023-08-07 | 2023-08-07 | High-viscosity lubricating oil, sealing oil flow and abrasive particle on-line detection method and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117516671A (en) * | 2024-01-05 | 2024-02-06 | 中国航空油料有限责任公司成都分公司 | Mobile standard device for calibrating flowmeter of aircraft fuelling vehicle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117516671A (en) * | 2024-01-05 | 2024-02-06 | 中国航空油料有限责任公司成都分公司 | Mobile standard device for calibrating flowmeter of aircraft fuelling vehicle |
| CN117516671B (en) * | 2024-01-05 | 2024-04-09 | 中国航空油料有限责任公司成都分公司 | Mobile standard device for calibrating flowmeter of aircraft fuelling vehicle |
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