CN117029969A - High-viscosity lubricating oil, sealing oil flow and abrasive particle on-line detection method and device - Google Patents

Abstract

High viscosity lubricating oil, sealing oil flow and abrasive particle online detection device and detection method. The detection device includes a detection module, a test bench and a test tube arranged on the test bench; the test tube includes a volume tube and a volume tube connected to the volume tube. Transparent tube; the detection module includes a flow detection module installed on the volume tube and an abrasive particle detection module installed on the transparent tube. A flow meter to be tested on the test tube is installed downstream of the volume tube; the flow detection module and abrasive particles The detection modules are respectively connected to the processor, and the processor transmits the received flow signal and abrasive particle signal to the display module. The device described in the invention can realize online measurement of high-viscosity lubricating oil or sealing oil, has high measurement accuracy, is suitable for on-site detection, is economical while ensuring accuracy, and can satisfy the needs of large-scale aerospace, petrochemical, shipbuilding, etc. On-site value traceability.

Description

High viscosity lubricating oil, sealing oil flow rate and abrasive particle online detection method and device

Technical field

The invention belongs to the technical field of lubricating oil, sealing oil flow rate and abrasive particle detection technology, and particularly relates to an online detection method and device for high viscosity lubricating oil, sealing oil flow rate and abrasive particle detection.

Background technique

Lubricating oil and sealing oil are indispensable in mechanical equipment; in addition to playing the role of lubrication and sealing, the state of the lubricating oil also reflects the operating status of the equipment to a certain extent. Therefore, the detection of lubricating oil flow and abrasive particles is related to the operation of the entire system. The flow meter can detect the flow rate of lubricating oil and sealing oil. However, after being used for a period of time, it will have errors. However, many devices cannot remove the flow meter for inspection. Therefore, the flow rate of lubricating oil or sealing oil will be detected. It will have a certain impact; in addition, the detection of abrasive particles needs to ensure that the liquid in use is detected. Laboratory testing is expensive and has hysteresis, so there is an urgent need for online testing of lubricating oil and sealing oil flow rates and abrasive particles.

The existing public detection methods for lubricating oil, sealing oil flow and abrasive particles are more or less static, or sent to laboratories for testing. This not only affects production, but also has high costs and cannot well reflect the impact of lubricating oil on the system under working conditions of the machinery. Moreover, sometimes it is unrealistic to stop the running equipment, and long-term inability to detect or inaccurate detection can easily cause Mechanical damage or even major accidents. Relevant data shows that safety accidents caused by aircraft engine failures caused by lubrication account for about 80% of aviation safety accidents.

For abrasive particle measurement, the current situation is:

The patent with announcement number: US7112973B2[P] discloses a method of detecting abrasive particles using the resistance principle. This method can be used to measure abrasive particles. However, this method can only roughly measure the number of ferromagnetic abrasive particles and cannot Without knowing the specific information of individual ferromagnetic abrasive particles, practical use is greatly limited.

Our company's application with announcement number CN115931090A discloses a lubricating oil quality, lubricating oil flow meter detection device and its detection method. Compared with the existing technology, this solution has greatly solved the problem of difficult detection of lubricating oil abrasive particles. The detection speed has been greatly improved, but this solution is based on the principle of electromagnetic induction. During actual use, it was found that only ferromagnetic abrasive particles larger than 100 μm and non-ferromagnetic abrasive particles larger than 400 μm can be detected. The monitoring accuracy is low. For high The applicability is low in situations where accuracy is required.

In addition, this solution is mainly aimed at lubricating oil or sealing oil with low viscosity. When encountering lubricating oil or sealing oil with high viscosity (greater than 20000mPa/s), its use effect is not good.

For flow measurement, the current situation is:

Lubricating oil or sealing oil is a typical non-Newtonian fluid, and the flow detection method cannot follow Newtonian fluids. Because the viscosity-temperature curve of lubricating oil or sealing oil does not follow a linear relationship, if offline detection or inspection is used, it will cause inaccuracy in flow traceability.

At present, most of the lubricating oil flow detection methods are: mass method and flow meter method. When using the mass method to detect the flow rate of lubricating oil or sealing oil, the impact force will cause inaccuracy in the measurement. The flow meter method is undoubtedly to install a flow meter on the pipeline, and know the flow rate of lubricating oil through the reading of the flow meter. The shortcoming of this method is that when the flow meter is used for non-Newtonian measurement, after a period of use, , the flow meter will have a large error. At this time, a standard meter needs to be used to calibrate the flow meter. If it is calibrated, it is often under experimental conditions and cannot simulate the actual working environment, resulting in low accuracy. question.

At the same time, in the existing technology, it is still not possible to integrate the measurement of lubricating oil and sealing oil into one online measurement line. On the one hand, two pipeline measurements will lengthen the measurement pipeline and not be close enough to the production process, thus affecting the accuracy of the measurement results. sex; on the other hand, it will increase the cost of testing.

Therefore, there is an urgent need for a method that can conduct online detection of the flow rate and abrasive particles of high-viscosity lubricating oil and sealing oil.

Contents of the invention

The present invention aims to provide an online detection method and device for high-viscosity lubricating oil, sealing oil flow and abrasive particles that is easy to implement and has high detection accuracy.

In order to solve the above technical problems, the present invention provides the following technical solution: an online detection device for high viscosity lubricating oil, sealing oil flow and abrasive particles, including a detection module, a test bench and a test tube arranged on the test bench; the test tube includes a volume tube and a transparent tube connected to the volume tube; the detection module includes a flow detection module installed on the volume tube and abrasive particle detection module installed on the transparent tube, and a flow meter to be tested on the test tube is installed downstream of the volume tube. ; The flow detection module and the abrasive particle detection module are respectively connected to the processor, and the processor transmits the received flow signal and abrasive particle signal to the display module.

The flow detection module includes a power source and a piston; the power source drives the piston to slide in the volume tube; the processor outputs a signal to control the work of the power source; the processor receives the moving distance of the piston.

The flow detection module also includes a grating sensor, which collects the movement signal of the piston; the grating sensor transmits the received movement signal to the processor.

The wear particle detection module includes a parallel beam set toward the transparent tube and a light processing circuit set corresponding to the parallel beam. The signal output end of the light processing circuit is connected to the signal input end of the processor.

The optical processing circuit includes a photoelectric conversion circuit and an amplification circuit; the signal output end of the photoelectric conversion circuit is connected to the signal input end of the amplification circuit, and the amplification circuit is connected to the signal input end of the processor.

The photoelectric conversion circuit includes 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 their anodes are connected to ground; the cathodes of both are connected to the inverting input terminal of the operational amplifier; the non-inverting input terminal of the operational amplifier is connected to ground; and the output terminal of the operational amplifier is connected through the first capacitor The inverting input terminal of the operational amplifier; the output terminal of the operational amplifier is connected to the first resistor; the second terminal of the first resistor is grounded through the filter capacitor; at the same time, the second terminal of the first resistor is connected in parallel through the second capacitor and the second resistor Connect to the inverting input of the op amp.

The amplifying circuit includes a low-noise operational amplifier, a low-noise instrument operational amplifier, a first ground resistor, a second ground resistor and a third capacitor;

The non-inverting input terminal of the low-noise operational amplifier is connected to the second terminal of the first resistor; the inverting input terminal of the low-noise operational amplifier is connected to the ground through the first ground resistor; at the same time, the inverting input terminal of the low-noise operational amplifier is also connected through the second resistor The output terminal of the low-noise operational amplifier is connected to the non-inverting input terminal of the low-noise instrument operational amplifier through the third capacitor; the inverting input terminal of the low-noise instrument operational amplifier is connected to the ground through the second ground resistor.

An online detection method for high viscosity lubricating oil, sealing oil flow and abrasive particles using the above device, the method includes the following steps in sequence:

1). Connect the test tube to the circulation loop of high-viscosity lubricating oil or sealing oil, and the high-viscosity lubricating oil or sealing oil enters the test tube;

2) Start the power source; the power source drives the piston to push the high-viscosity lubricating oil or sealing oil out of the test tube and flows through the flow meter to be tested. Check that the reading of the flow meter to be tested is Qv;

3) Calculate the standard flow rate of high-viscosity lubricating oil or sealing oil through formula (1):

Qs＝V/Δt Formula (1)

Among them, V is the volume of high-viscosity lubricating oil or sealing oil pushed out by the piston; t is the time for the piston to move;

4) Calculate the error of the flow meter to be tested through formula (2):

S＝Qv-Qs Formula (2)

5) The high-viscosity lubricating oil or sealing oil flows through the flow meter to be inspected and then enters the transparent tube, and then returns to the circulation loop from the transparent tube;

6). The parallel beam passes through the transparent tube and enters the light processing circuit;

7) The optical processing circuit converts optical signals into electrical signals;

8) Determine whether there are abrasive particles in the high-viscosity lubricating oil or sealing oil based on the electrical signal obtained in step 7);

The judgment method is: if the electrical signal is a constant voltage, there are no abrasive particles in the high-viscosity lubricating oil or sealing oil, and the detection process is completed;

If there are negative pulses in the electrical signal, then the high-viscosity lubricating oil or sealing oil has abrasive particles, then proceed to step (9);

(9) Calculate the number and diameter of abrasive grains:

The calculation method of the number of abrasive grains is: calculate the number of negative pulses in the electrical signal. The number of negative pulses in the electrical signal is the same as the number of abrasive grains;

The calculation method of the abrasive particle diameter is to calculate the abrasive particle diameter according to formula (3)

Among them, δE is the negative pulse voltage value; d is the equivalent diameter of the abrasive grain; A is the cross-sectional area of the parallel beam; E ₀ is the electrical signal voltage value.

The volume of high-viscosity lubricating oil or sealing oil pushed out by the piston is calculated as follows: measure the moving distance of the piston, and obtain the volume according to formula (4);

V＝πr ² h Formula (4)

where h is the moving distance of the piston; r is the radius of the cross-section of the volume tube.

The standard flow rate of high-viscosity lubricating oil or sealing oil, the error of the flow meter to be tested, the number of abrasive grains, and the radius of abrasive grains are displayed on the display module.

Through the above technical solutions, the technical effects of the present invention are as follows: 1. The device of the present invention can realize online measurement of high-viscosity lubricating oil or sealing oil, has high measurement accuracy, is suitable for on-site detection, and is economical while ensuring accuracy. ; It can maximize the traceability of large-scale sites such as aerospace, petrochemicals, and ships; 2. The set-up test bench can be raised and lowered according to the site conditions to support the detection module; 3. The set-up flow detection and abrasive particle detection can Implemented in one system, it avoids the problem of reduced detection accuracy caused by too many processes for the samples to be tested on-site; 4. The online measurement method of the flow rate and abrasive particles of high-viscosity lubricating oil or sealing oil according to the present invention can It achieves simultaneous measurement of flow rate and abrasive particles with high measurement accuracy and is more suitable for industrial sites. At the same time, it is easy to implement and the test results are not easily affected by the outside world. At the same time, the test results have no hysteresis and non-stop detection is achieved.

Description of the drawings

Figure 1 is a block diagram of the device according to the present invention;

Figure 2 is a schematic diagram of the test bench structure;

Figure 3 is a schematic diagram of the photoelectric conversion circuit;

Figure 4 is a schematic diagram of the amplification circuit;

Figure 5 is the schematic diagram of the processor circuit;

Figure 6 is a flow chart of the method of the present invention;

Figure 7 is a schematic diagram of the monitoring area without abrasive particles;

Figure 8 is a schematic diagram of abrasive particles in the monitoring area.

Detailed ways

High viscosity lubricating oil, sealing oil flow rate and abrasive particle online detection device. It is worth noting that this application is aimed at lubricating oil or sealing oil with a viscosity greater than 20000mPa/s.

As shown in Figure 1, this device includes a test bench 1 and a detection module. When used, the test bench 1 is raised and lowered to the circulation pipeline of lubricating oil or sealing oil, and the lubricating oil or sealing oil circulates in the circulation pipeline. , directly detect lubricating oil or sealing oil through the detection module, thereby achieving dynamic measurement, which is more in line with the actual situation, and the detection results are highly accurate.

The structure of the test bench 1 is defined as follows: As shown in Figure 2, the test bench 1 includes a base 13 and a work surface located above the base 13. The work surface is provided with a level 11; the bottom of the base 13 is provided with a moving wheel 14; the work surface and the base are There are hydraulic rods 12 connected between 13; in this embodiment, the number of hydraulic rods 12 is 3, and the 3 hydraulic rods 12 are distributed in a triangle, thereby improving the stability of the connection between the work surface and the base 13, and also ensuring the stability of the work surface. Steady rise. In order to ensure the accuracy of the test results, a level 11 is provided on the work surface to ensure the level of the work surface and avoid external influences on the test results.

As shown in Figures 3 to 5, there is a test tube on the test bench 1, and the test tube pressure resistance value is: 3.5Mpa; during implementation, the test tube is used to connect the circulation pipeline, and the lubricating oil or sealing oil in the circulation pipeline is from The test tube comes in at one end and comes out from the other end and enters the circulation pipeline again. This saves the heating of lubricating oil or sealing oil, and also ensures the mobility of the sample to be tested, enabling online measurement and making the test results more accurate. precise.

In this embodiment, the test tube includes a volume tube 5 and a transparent tube 7 connected to the volume tube 5 .

The detection module includes a flow detection module installed on the volume tube 5 and abrasive particle detection module installed on the transparent tube 7. A flow meter 6 to be tested on the test tube is installed downstream of the volume tube 5; the flow detection module and The wear particle detection module is respectively connected to the processor, and the processor transmits the received flow signal and wear particles to the display module.

Therefore, the flow detection module detects the standard flow rate of lubricating oil or sealing oil, and there will be a flow reading on the flow meter 6 to be checked. According to the relationship between the flow reading and the standard flow rate, the error of the flow meter 6 to be checked can be obtained. After the flow measurement is completed, the lubricating oil or sealing oil will enter the transparent tube 7 for wear particle detection.

The flow detection module transmits the received flow signal and the abrasive particle detection module receives the abrasive particle signal to the processor, which is then displayed on the display module through the processor.

In this embodiment, the processor uses a single-chip microcomputer model MSP430F5529.

Next, the flow detection module and abrasive particle detection module will be introduced in detail:

The flow detection module is used to measure flow. The module includes a power source and a piston 4; the power source drives the piston 4 to be slidably disposed in the volume tube 5.

Among them, the power source includes a motor 2, a screw 3 and a nut; the output shaft of the motor 2 is connected to the screw 3, the nut is screwed to the screw 3, and the nut is connected to the piston 4.

When working, the motor 2 rotates, thereby driving the screw 3 to rotate. As the screw 3 rotates, the nut drives the piston 4 to move along the length of the volume tube 5; as the piston 4 moves, the lubrication in the volume tube 5 The oil or sealing oil comes out of the volume tube 5 and enters the flow meter 6 to be inspected.

In this embodiment, an external force source drives the movement of high-viscosity lubricating oil or sealing oil to avoid the phenomenon that the viscosity is too high and cannot be measured.

Since the motor 2 needs to rotate during the operation of the power source, in order to control the operation of the motor 2, the single-chip computer U1 outputs a signal to control the operation of the power source. The implementation method is: the signal output end of the single-chip computer U1 is connected to the motor driver chip U6. Motor driver chip U6 drives the work of motor 2. Among them, the motor driver chip U6 can be selected: L298N.

The signal output terminal (pins P7.6, P7.5) of the microcontroller U1 is connected to the signal input terminal (pins IN1, IN2) of the motor driver chip U6; the signal output terminal (pins OUT1, OUT2) of the motor driver chip U6 is connected Control terminal of motor 2 (pins A, B). The microcontroller U1 outputs a signal to the motor driver chip U6, and the motor driver chip U6 drives the rotation of the motor 2.

At the same time, a grating sensor (model SMW-GSC, manufacturer: Simingwei) is connected to the signal input end of the microcontroller U1, and the grating sensor collects the movement distance of the piston 4.

The signal output terminal (pin OUT) of the grating displacement sensor is connected to the signal input terminal (pin P7.7) of the microcontroller U1 through the terminal J1, so that the grating sensor transmits the received movement signal to the microcontroller U1.

As the motor 2 works, 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, it can be concluded that the lubrication Standard flow rate of oil or sealing oil.

After this part of lubricating oil or sealing oil enters the flow meter 6 to be inspected, there will be a reading on the flow meter 6 to be inspected. This reading is the flow rate of the lubricating oil or sealing oil measured by the flow meter 6 to be inspected; By comparing it with the standard flow rate, the error of the flow meter 6 to be tested can be obtained.

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 wear particle detection module will detect the wear particles in the lubricating oil or sealing oil.

The wear particle detection module includes a parallel beam 8 arranged toward the transparent tube 7 and a light processing circuit 9 arranged corresponding to the parallel beam 8. After the parallel beam 8 passes through the transparent tube 7, it is received by the light processing circuit 9. The signal output end of the light processing circuit 9 is connected to the signal input end of the microcontroller U1.

Among them, the optical processing circuit 9 is used to realize photoelectric conversion and at the same time amplify the converted electrical signal; the optical processing circuit 9 includes a photoelectric conversion circuit and an amplification circuit; the signal output end of the photoelectric conversion circuit is connected to the signal input end of the amplification circuit, and the amplification circuit The circuit is connected to the signal input end of the microcontroller U1.

Among them, the photoelectric conversion circuit includes 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 their anodes are grounded; their cathodes are connected to the operational amplifier U2 The inverting input terminal (-).

The non-inverting input terminal (+) of the operational amplifier U2 is connected to ground; the output terminal of the operational amplifier U2 is connected to the inverting input terminal (-) of the operational amplifier U2 through the first capacitor cf1; at the same time, the output terminal of the operational amplifier U2 is connected to the first resistor R; The second end of the first resistor R is connected to the ground through the filter capacitor C; in addition, the second end of the first resistor R is connected to the inverting input end (-) of the operational amplifier U2 through the second capacitor cf2 and the second resistor Rf connected in parallel.

The amplification circuit includes low-noise operational amplifier U3 (model: AD4829) and low-noise instrumentation operational amplifier U4 (model: INA103).

The non-inverting input terminal (+) of the low-noise operational amplifier U3 is connected to the second terminal of the first resistor R; the inverting input terminal (-) of the low-noise operational amplifier U3 is connected to the ground through the first grounding resistor R3; the inverting terminal of the low-noise operational amplifier U3 is connected to the second terminal of the first resistor R. The phase input terminal (-) is also connected to the output terminal of the low-noise operational amplifier U3 through the first connection resistor R2.

The output terminal of the low-noise operational amplifier U3 is connected to the non-inverting input terminal (+) of the low-noise instrument operational amplifier U4 through the third capacitor C3; the inverting input terminal (-) of the low-noise instrument operational amplifier U4 is connected to a second ground resistor R5. . The output end of the low-noise instrument operational amplifier U4 is connected to the signal input end of the microcontroller U1 (pin P7.4)

The second end of the third capacitor C3 is connected to the third ground resistor R4 and the adjustable resistor RW. The second end of the third ground resistor R4 is connected to the first end of the adjustable resistor RW; the second end of the adjustable resistor RW is connected to The second end of the second ground resistor R5 is connected to the ground. At the same time, the adjustable end of the adjustable resistor RW is connected to the ground; the amplification factor can be adjusted through the adjustable resistor RW.

The tiny electrical signal when the abrasive particles pass through can be amplified through the amplification circuit. In this embodiment, the signal input line uses a shielded cable as short as possible, and the circuit board uses a high-insulation circuit board with small leakage current.

When working, the microcontroller U1 will display the received standard flow information, abrasive grain quantity and abrasive grain size information on the display module.

Among them, the display module includes a display screen (model: LED1602). Since the standard flow information, the number of abrasive particles, and the size of abrasive particles are three data quantities, three display screens are required, and only one of them is displayed in this embodiment.

The signal input end of the display screen (pins D0~D7) is connected to the signal output end (pins P6.4~P7.3) of the microcontroller U1.

At the same time, the single-chip computer U1 will also transmit the received standard flow information, abrasive grain quantity and abrasive grain size information to the host computer. In this embodiment, the computer is used as the host computer as an example for explanation.

There is a 232 chip (model MAX232) connected to the microcontroller U1. Specifically, the serial port (pins P4.5, P4.4) of the microcontroller U1 are connected to the R0OUT and T0IN pins of the 232 chip respectively; the T0OUT and R0IN of the 232 chip are connected to the upper Holes 2 and 3 of the serial port connector DB of the machine.

When working, the microcontroller outputs a signal to the motor, and the motor drives the screw to rotate, thereby causing the piston to move a set distance in the volume tube; based on the piston movement distance, the microcontroller obtains the corresponding flow rate of the liquid; at the same time, compared with the flow rate of the flow meter to be inspected value; the liquid enters the transparent tube, and the light of the parallel beam passes through the transparent tube and enters the light processing circuit. An electrical signal is formed in the light processing circuit and sent to the microcontroller. The microcontroller determines whether there are abrasive particles based on whether there is a pulse in the electrical signal, and The number of abrasive grains. The microcontroller transmits the standard flow rate and abrasive grain quantity information to the display screen for display, and also transmits the above information to the host computer for storage and display.

The device described in the invention can realize online measurement of high-viscosity lubricating oil or sealing oil, has high measurement accuracy, is suitable for on-site detection, is economical and ensures accuracy; and can satisfy the needs of large-scale aerospace, petrochemical, shipbuilding and other large-scale industries to the greatest extent. On-site value traceability.

This embodiment also discloses a method for online detection of high viscosity lubricating oil, sealing oil flow and abrasive particles using the above device, as shown in Figures 6 to 7. The method includes the following steps in sequence:

1). Connect the test tube to the circulation loop of high-viscosity lubricating oil or sealing oil, and the high-viscosity lubricating oil or sealing oil enters the test tube. In this embodiment, the pressure resistance value of the test tube is: 3.5Mpa.

In addition, the work surface needs to be leveled before step 1). The levelness must meet 2 poles and the error should be within 15 μm.

2) Start the power source; the power source drives the piston to push the high-viscosity lubricating oil or sealing oil out of the test tube and flows through the flow meter to be tested. Check that the reading of the flow meter to be tested is Qv.

In this embodiment, the power source is a motor, and the processor outputs a signal to cause the motor to work, thereby driving the piston to travel a set distance.

3) Calculate the standard flow rate of high-viscosity lubricating oil or sealing oil through formula (1):

Qs＝V/Δt Formula (1)

Among them, V is the volume of high-viscosity lubricating oil or sealing oil pushed out by the piston; t is the time for the piston to move;

Among them, the calculation method for the volume of high-viscosity lubricating oil or sealing oil pushed out by the piston is: measure the moving distance of the piston, and obtain the volume according to formula (4);

V＝πr ² h Formula (4)

Among them, h is the moving distance of the piston; r is the radius of the cross-section of the volume tube. In this embodiment, the moving distance of the piston can be obtained through a grating sensor, which is highly accurate and easy to obtain.

4) Calculate the error of the flow meter to be tested through formula (2):

S＝Qv-Qs Formula (2)

The obtained standard flow rate and the error of the flow meter to be tested are displayed on the 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 the flow meter to be inspected and then enters the transparent tube 7, and then returns to the circulation loop from the transparent tube 7; thereby realizing online detection of high-viscosity lubricating oil or sealing oil and ensuring It achieves dynamic measurement and at the same time avoids the problem of the test environment changing after sampling, effectively improving the accuracy of the test results and making the test results more suitable for the work site.

6) During the process of high-viscosity lubricating oil or sealing oil passing through the transparent tube 7, the parallel beam passes through the transparent tube 7 and then enters 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 the optical signal into an electrical signal and amplifies it, using a photoelectric conversion circuit and an amplifying circuit.

8) Determine whether there are abrasive particles in the high-viscosity lubricating oil or sealing oil based on the electrical signal obtained in step 7);

The judgment method is:

When the electrical signal is a constant voltage, there are no abrasive particles in the high-viscosity lubricating oil or sealing oil, and the detection process is completed;

When there is a negative pulse in the electrical signal, the high viscosity lubricating oil or sealing oil has abrasive particles, then proceed to step (9);

In this embodiment, when there are no abrasive particles in the monitoring area, all parallel light beams are concentrated on the light processing circuit. When there are abrasive particles in the monitoring area, the parallel light beams will be blocked by the abrasive particles. The light processing circuit estimates the wear by measuring changes in light. particle size and concentration. The present invention can measure the diameter of abrasive particles ≤5 μm, and its accuracy is much higher than that of testing methods using other principles such as electromagnetic methods and acoustic methods.

(9) Calculate the number and diameter of abrasive grains:

The calculation method of the number of abrasive grains is: calculate the number of negative pulses in the electrical signal. The number of negative pulses in the electrical signal is the same as the number of abrasive grains. When the particles pass through the detection area one by one, one pulse signal corresponds to one particle. Therefore, the size and number of particles in the liquid to be measured can be obtained by amplitude screening and counting of all pulse signals.

The calculation method of the abrasive particle diameter is to calculate the abrasive particle diameter according to formula (3)

Among them, δE is the negative pulse voltage value; d is the equivalent diameter of the abrasive grain; A is the cross-sectional area of the parallel beam; E ₀ is the electrical signal voltage value.

The number and radius of abrasive grains of high-viscosity lubricating oil or sealing oil are displayed on the display module, and the values are transmitted to the host computer.

The online measurement method of flow rate and abrasive particles of high-viscosity lubricating oil or sealing oil according to the present invention can realize simultaneous measurement of flow rate and abrasive particles, has high measurement accuracy, and is more suitable for industrial sites; at the same time, it is easy to implement and the test results are not easy to obtain. Influenced by the outside world.

Claims (10)

1. An online detection device for high viscosity lubricating oil, sealing oil flow and abrasive particles, which is characterized by: including a detection module, a test bench and a test tube arranged on the test bench; the test tube includes a volume tube and a transparent tube connected to the volume tube ; The detection module includes a flow detection module installed on the volume tube and abrasive particle detection module installed on the transparent tube. A flow meter to be tested on the test tube is installed downstream of the volume tube; the flow detection module and the abrasive particle detection module The processors are connected respectively, and the processor transmits the received flow signal and abrasive particle signal to the display module. At the same time, the processor transmits the received flow signal and abrasive particle signal to the host computer. 2. The online detection device for high viscosity lubricating oil, sealing oil flow and abrasive particles as claimed in claim 1, characterized in that: the flow detection module includes a power source and a piston; the power source drives the piston to slide and be arranged in the volume tube; the processor outputs The signal controls the operation of the power source; the processor receives the distance traveled by the piston. 3. The online detection device for high viscosity lubricating oil, sealing oil flow and abrasive particles as claimed in claim 2, characterized in that: the flow detection module also includes a grating sensor, and the grating sensor collects the movement signal of the piston; the grating sensor will receive the The mobile signal is transmitted to the processor. 4. The online detection device for high viscosity lubricating oil, sealing oil flow and abrasive particles as claimed in claim 3, characterized in that: the abrasive particle detection module includes a parallel beam set toward the transparent tube and a light processing circuit set corresponding to the parallel beam, The signal output end of the light processing circuit is connected to the signal input end of the processor. 5. The online detection device for high viscosity lubricating oil, sealing oil flow and abrasive particles as claimed in claim 4, characterized in that: the light processing circuit includes a photoelectric conversion circuit and an amplification circuit; the signal output end of the photoelectric conversion circuit is connected to the amplification circuit. The signal input terminal, the amplifier circuit is connected to the signal input terminal of the processor. 6. The online detection device for high viscosity lubricating oil, sealing oil flow and abrasive particles as claimed in claim 5, characterized in that: the photoelectric conversion circuit includes an operational amplifier, a first photodiode, a second photodiode, a first capacitor, a third a resistor, filter capacitor, second capacitor and second resistor; The first photodiode and the second photodiode are connected in parallel, and their anodes are connected to ground; the cathodes of both are connected to the inverting input terminal of the operational amplifier; the non-inverting input terminal of the operational amplifier is connected to ground; and the output terminal of the operational amplifier is connected through the first capacitor The inverting input terminal of the operational amplifier; the output terminal of the operational amplifier is connected to the first resistor; the second terminal of the first resistor is grounded through the filter capacitor; at the same time, the second terminal of the first resistor is connected in parallel through the second capacitor and the second resistor Connect to the inverting input of the op amp. 7. The online detection device for high viscosity lubricating oil, sealing oil flow and abrasive particles according to claim 5 or 6, characterized in that: the amplifying circuit includes a low-noise operational amplifier, a low-noise instrument operational amplifier, a first grounding resistor, a third two ground resistors and a third capacitor; The non-inverting input terminal of the low-noise operational amplifier is connected to the second terminal of the first resistor; the inverting input terminal of the low-noise operational amplifier is connected to the ground through the first ground resistor; at the same time, the inverting input terminal of the low-noise operational amplifier is also connected through the second resistor The output terminal of the low-noise operational amplifier is connected to the non-inverting input terminal of the low-noise instrument operational amplifier through the third capacitor; the inverting input terminal of the low-noise instrument operational amplifier is connected to the ground through the second ground resistor. 8. An online detection method for high viscosity lubricating oil, sealing oil flow rate and abrasive particles using the device of claim 1, characterized in that: the method includes the following steps in sequence: 1). Connect the test tube to the circulation loop of high-viscosity lubricating oil or sealing oil, and the high-viscosity lubricating oil or sealing oil enters the test tube; 2) Start the power source; the power source drives the piston to push the high-viscosity lubricating oil or sealing oil out of the test tube and flows through the flow meter to be tested. Check that the reading of the flow meter to be tested is Qv; 3) Calculate the standard flow rate of high-viscosity lubricating oil or sealing oil through formula (1): Qs=V/Δt formula (1) Among them, V is the volume of high-viscosity lubricating oil or sealing oil pushed out by the piston; t is the time for the piston to move; 4) Calculate the error of the flow meter to be tested through formula (2): S=Qv-Qs formula (2) 5) The high-viscosity lubricating oil or sealing oil flows through the flow meter to be inspected and then enters the transparent tube, and then returns to the circulation loop from the transparent tube; 6). The parallel beam passes through the transparent tube and enters the light processing circuit; 7) The optical processing circuit converts optical signals into electrical signals; 8) Determine whether there are abrasive particles in the high-viscosity lubricating oil or sealing oil based on the electrical signal obtained in step 7); The judgment method is: if the electrical signal is a constant voltage, there are no abrasive particles in the high-viscosity lubricating oil or sealing oil, and the detection process is completed; If there are negative pulses in the electrical signal, then the high-viscosity lubricating oil or sealing oil has abrasive particles, then proceed to step (9); (9) Calculate the number and diameter of abrasive grains: The calculation method of the number of abrasive grains is: calculate the number of negative pulses in the electrical signal. The number of negative pulses in the electrical signal is the same as the number of abrasive grains; The calculation method of the abrasive particle diameter is to calculate the abrasive particle diameter according to formula (3) Among them, δE is the negative pulse voltage value; d is the equivalent diameter of the abrasive grain; A is the cross-sectional area of the parallel beam; E ₀ is the electrical signal voltage value. 9. The method for online detection of high viscosity lubricating oil, sealing oil flow and abrasive particles as claimed in claim 8, characterized in that: the volume of the high viscosity lubricating oil or sealing oil pushed out by the piston is calculated by: measuring the moving distance of the piston. , the volume is obtained according to formula (4); V＝πr ² h Formula (4) where h is the moving distance of the piston; r is the radius of the cross-section of the volume tube. 10. The online detection method of high viscosity lubricating oil, sealing oil flow and abrasive particles as claimed in claim 9, characterized in that: the standard flow rate of high viscosity lubricating oil or sealing oil, the error of the flow meter to be tested and the individual abrasive particles are combined. number, the radius of the abrasive grain is displayed on the display module.