1. The utility model provides an oil grit monitoring devices which characterized in that: comprises a micro-fluidic chip (1), an image acquisition system and an image processing system;

the micro-fluidic chip (1) comprises a substrate (10) and a chip main body (11), wherein a first micro-channel (18) and a second micro-channel (17) which are arranged side by side are arranged on the chip main body (11), a transverse micro-channel (165) which enables the first micro-channel (18) and the second micro-channel (17) to be communicated is arranged between the first micro-channel (18) and the second micro-channel (17), oil to be monitored is introduced into the first micro-channel (18), and clean oil is introduced into the second micro-channel (17);

the lower surfaces of the first microchannel (18), the second microchannel (17) and the transverse microchannel (165) are all planes;

the substrate (10) is provided with a magnetic component (110) which is arranged corresponding to the transverse microchannel (165), and the magnetic component (110) is arranged on one side, away from the first microchannel (18), of the second microchannel (17);

the first micro-channel (18) and the second micro-channel (17) are provided with an image acquisition area (19) matched with an image acquisition system on one side, close to the outlet, of the transverse micro-channel (165), and the image acquisition system sends acquired images to an image processing system for processing.

2. The oil abrasive particle monitoring device of claim 1, wherein: the image acquisition area (19) of the second microchannel (17) is provided with an abrasive particle separating device, the abrasive particle separating device comprises a first separating component (196), a second separating component (197), a third separating component (198) and a fourth separating component (199) which are transversely arranged side by side, the four groups of separating components divide the image acquisition area (19) in the second microchannel (17) into 5 acquisition channels, and the width of the 5 acquisition channels is gradually reduced from the magnetic component (110) to the first microchannel (18).

3. The oil wear monitoring device of claim 2, wherein: the lengths of the first to fourth partition members (199) are sequentially shortened, and the ends of the first to fourth partition members (199) near the oil outlet are aligned with each other.

4. The oil wear monitoring device of claim 2, wherein: all offer the direction inclined plane that sets up towards magnetic part (110) one side on first to fourth partition part (199), the contained angle of direction inclined plane and horizontal direction is 30.

5. The oil abrasive particle monitoring device of claim 1, wherein: the both sides of horizontal microchannel (165) set up fifth partition part (161) and sixth partition part (162) respectively, fifth partition part (161) and sixth partition part (162) symmetry set up, first inclined plane (164) that set up towards second microchannel (17) are seted up to the one end that fifth partition part (161) are close to horizontal microchannel (165), second inclined plane (163) that set up towards second microchannel (17) are seted up towards the one end of horizontal microchannel (165) to sixth partition part (162).

6. The oil abrasive particle monitoring device of claim 1, wherein: the flow rates of the clean oil and the oil to be monitored are 2 ml/min.

7. The oil abrasive particle monitoring device of claim 1, wherein: the micro-fluidic chip (1) is made of transparent materials, the image acquisition system comprises a transmission light source (2) arranged below the micro-fluidic chip (1), a reflection light source (6) arranged above the micro-fluidic chip (1), an objective lens (8) arranged below the reflection light source (6) and a photoelectric sensor (7) arranged above the emission light source, and the photoelectric sensor (7) is electrically connected with the image processing system.

8. The oil abrasive particle monitoring device of claim 1, wherein: still include sampling system, sampling system is including objective table (3) that is used for supporting micro-fluidic chip (1), with the oil pipeline (4) that awaits measuring of the entry intercommunication of first microchannel (18), with the clean fluid pipeline of the entry intercommunication of second microchannel (17), locate respectively that await measuring two sets of sampling pumps (5) on oil pipeline (4) and the clean fluid pipeline, respectively with two sets of waste oil pipeline (9) of the export intercommunication of first microchannel (18) and second microchannel (17).

9. The oil abrasive particle monitoring device of claim 1, wherein: the image processing system comprises an image enhancement processing unit, an image segmentation processing unit, a parameter feature extraction unit and an identification and classification statistical unit; the image enhancement processing unit is used for enhancing the image, the image segmentation processing unit is used for segmenting the enhanced image, the parameter feature extraction unit is used for respectively extracting the parameter features of the segmented image, and the identification and classification statistical unit is used for identifying and classifying the extracted parameters to obtain the quantity of the abrasive particles of different types.

10. An oil abrasive particle monitoring method is characterized in that: comprises that

Step 1, turning on a computer, and turning on a light source and all instruments;

step 2, introducing oil to be monitored into a first micro-channel (18), and introducing clean oil of the same brand into a second micro-channel (17);

step 3, under the action of a magnetic field, ferromagnetic abrasive particles in the first micro-channel (18) enter the second micro-channel (17) through the transverse micro-channel (165) and respectively enter image acquisition regions (19) of different acquisition channels according to different sizes, and non-ferromagnetic abrasive particles move forwards along the axial direction of the first micro-channel (18) and enter the image acquisition regions (19);

and 4, the image acquisition system takes a microscopic picture of the abrasive particle image in the image acquisition area (19), performs enhancement and segmentation processing, and then performs parameter extraction, abrasive particle type identification and classified statistics.

Background

In the running process of the aircraft engine, friction pairs such as bearings, gears and the like of the aircraft engine work under the conditions of high temperature, high pressure and high load. The relative motion of the friction pair inevitably generates friction and abrasion, abrasive particles are generated in the abrasion process of the machine, and the cleaning action of lubricating oil brings the abrasive particles into a lubricating oil system. The abrasive particles bear the wear information of the machine equipment and can reflect the wear state of the machine. The wear mode and the system state of the engine can be reflected by the characteristics of the color, the size, the shape, the quantity, the morphology and the like of the abrasive particles. The parameter change of abrasive particles in the oil can reflect the state of machine lubricating oil and the wear condition of parts, and the color of the abrasive particles can judge the wear position of the machine, whether the oil contains water and the load condition of the machine; the size and the quantity of the abrasive particles can judge the abrasion degree of the machine; the shape and morphology of the abrasive particles can determine the type of wear of the machine. Therefore, the wear condition of the engine can be known in real time by monitoring the abrasive particles of the lubricating oil, so that the running state of the machine can be mastered, the failure occurrence trend and position can be predicted, a basis is provided for the visual maintenance of the machine, and the effective and economical running of the engine can be realized.

The existing lubricating oil abrasive grain testing device, such as LNF Q200 equipment of the spectral company based on image principle, can classify and count the quantity of abrasive grains, but the abrasive grain testing device can only monitor metal abrasive grains with the grain diameter larger than 20 μm, can not distinguish ferromagnetic abrasive grains from non-ferromagnetic abrasive grains, and is very expensive.

Similar technologies are also related in some patents, and patent No. CN105784570A proposes a particle detection device and a detection method based on a microfluidic chip, which mainly apply a capacitance method to detect metal abrasive particles in oil, judge the size of the abrasive particles according to the change of capacitance value between electrodes, and count the number of the abrasive particles. However, this method has the disadvantages that it is only possible to count the number of abrasive grains, and it is impossible to determine the type of abrasive grains, and it is difficult to mount the electrode. Therefore, how to more effectively acquire the abrasive grain information is a problem to be solved.

Disclosure of Invention

The application aims at providing an oil abrasive particle monitoring device and an oil abrasive particle monitoring method, and the device and the method are used for solving the problems that in the prior art, the abrasive particle detection resolution is low, ferromagnetic abrasive particles and non-ferromagnetic abrasive particles cannot be distinguished, and the detailed information of the abrasive particles is difficult to determine.

The technical scheme of the application is as follows: an oil abrasive particle monitoring device comprises a microfluidic chip, an image acquisition system and an image processing system;

the micro-fluidic chip comprises a substrate and a chip main body, wherein a first micro-channel and a second micro-channel which are arranged side by side are arranged on the chip main body, a transverse micro-channel for communicating the first micro-channel and the second micro-channel is arranged between the first micro-channel and the second micro-channel, oil to be monitored is introduced into the first micro-channel, and clean oil is introduced into the second micro-channel;

the lower surfaces of the first microchannel, the second microchannel and the transverse microchannel are all planes;

the substrate is provided with a magnetic component arranged corresponding to the transverse micro-channel, and the magnetic component is arranged on one side of the second micro-channel, which is far away from the first micro-channel;

the first micro-channel and the second micro-channel are provided with image acquisition regions matched with the image acquisition system on one side of the transverse micro-channel close to the outlet, and the image acquisition system sends acquired images to the image processing system for processing.

Preferably, the image acquisition region of the second microchannel is provided with an abrasive particle separating device, the abrasive particle separating device comprises a first separating part, a second separating part, a third separating part and a fourth separating part which are transversely arranged side by side, the four groups of separating parts divide the image acquisition region in the second microchannel into 5 acquisition channels, and the width of the 5 acquisition channels is gradually reduced from the magnetic part to the first microchannel.

Preferably, the lengths of the first to fourth partition members are successively shortened, and ends of the first to fourth partition members near the oil outlet are aligned with each other.

Preferably, the first to fourth partition parts are all provided with a guide inclined plane arranged towards one side of the magnetic part, and the included angle between the guide inclined plane and the horizontal direction is 30 degrees.

Preferably, horizontal microchannel's both sides set up fifth partition part and sixth partition part respectively, fifth partition part and sixth partition part symmetry set up, the first inclined plane of setting towards the second microchannel is seted up to the one end that fifth partition part is close to horizontal microchannel, the second inclined plane of setting towards the second microchannel is seted up to the one end of sixth partition part towards horizontal microchannel.

Preferably, the flow rates of the clean oil and the oil to be monitored are 2 ml/min.

Preferably, the microfluidic chip is made of a transparent material, the image acquisition system comprises a transmission light source arranged below the microfluidic chip, a reflection light source arranged above the microfluidic chip, an objective lens arranged below the reflection light source, and a photoelectric sensor arranged above the emission light source, and the photoelectric sensor is electrically connected with the image processing system.

Preferably, still include sampling system, sampling system includes the objective table that is used for supporting micro-fluidic chip, the fluid pipeline that awaits measuring with the entry intercommunication of first microchannel, with the clean fluid pipeline of the entry intercommunication of second microchannel, locate respectively that await measuring on fluid pipeline and the clean fluid pipeline two sets of sampling pumps, respectively with the two sets of waste oil pipelines of the export intercommunication of first microchannel and second microchannel.

Preferably, the image processing system comprises an image enhancement processing unit, an image segmentation processing unit, a parameter feature extraction unit and a recognition and classification statistical unit; the image enhancement processing unit is used for enhancing the image, the image segmentation processing unit is used for segmenting the enhanced image, the parameter feature extraction unit is used for respectively extracting the parameter features of the segmented image, and the identification and classification statistical unit is used for identifying and classifying the extracted parameters to obtain the quantity of the abrasive particles of different types.

The oil abrasive particle monitoring method comprises

Step 1, turning on a computer, and turning on a light source and all instruments;

step 2, introducing oil to be monitored into a first micro-channel, and introducing clean oil of the same brand into a second micro-channel;

step 3, under the action of a magnetic field, ferromagnetic abrasive particles in the first microchannel enter the second microchannel through the transverse microchannel and respectively enter image acquisition regions of different acquisition channels according to different sizes, and non-ferromagnetic abrasive particles move forwards along the axial direction of the first microchannel and enter the image acquisition regions;

and 4, the image acquisition system takes a microscopic picture of the abrasive particle image in the image acquisition area, performs enhancement and segmentation processing, and then performs parameter extraction, abrasive particle type identification and classified statistics.

The utility model provides a fluid grit monitoring devices is through setting up first microchannel and second microchannel to set up the horizontal microchannel that makes both intercommunications between the two, then correspond in horizontal microchannel department and set up magnetic part and carry out image acquisition in order to send into ferromagnetic grit and non-ferromagnetic grit respectively to the microchannel of difference in, thereby realize ferromagnetic and non-ferromagnetic grit monitoring, improve the precision.

Preferably, an abrasive particle separating device is arranged in the image acquisition area of the first microchannel, and the abrasive particle separating device divides the second microchannel into 5 acquisition channels gradually reduced from one side of the magnetic part, so that ferromagnetic abrasive particles with different sizes are separated, the abrasive particle overlapping phenomenon is reduced, and the precision is further improved.

Drawings

In order to more clearly illustrate the technical solutions provided by the present application, the following briefly introduces the accompanying drawings. It is to be expressly understood that the drawings described below are only illustrative of some embodiments of the invention.

FIG. 1 is a schematic diagram of a chip structure according to the present application;

FIG. 2 is a cross-sectional view of an image capture area of a chip according to the present application;

fig. 3 is a schematic structural view of an image acquisition system and a sample injection system according to the present application.

1-a microfluidic chip; 2-a transmissive light source; 3-an objective table; 4-oil pipeline to be tested; 5-a sample injection pump; 6-a reflective light source; 7-a photosensor; 8-an objective lens; 9-a waste oil pipeline; 10-a substrate; 11-a chip body; 110-a magnetic component; 12-a second liquid outlet; 13-a second liquid inlet; 14-a first liquid inlet; 15-a first liquid outlet; 16-an abrasive particle separation region; 161-a fifth partition member; 162-a sixth partition member; 163-a second bevel; 164-a first bevel; 165-transverse microchannels; 17. a second microchannel; 18. a first microchannel; 19. an image acquisition area; 190-non-ferromagnetic abrasive particle collection channel; 191-a ferromagnetic abrasive grain first collection microchannel; 192-ferromagnetic abrasive particle second collection microchannel; 193-ferromagnetic abrasive grain third collection microchannel; 194-ferromagnetic abrasive particle fourth collection microchannel; 195-a fifth collection microchannel of ferromagnetic abrasive particles; 196-a first partition member; 197-a second partition member; 198-a third partition member; 199-fourth partition member.

Detailed Description

In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application.

An oil abrasive particle monitoring device is shown in figure 1 and comprises a micro-fluidic chip 1, an image acquisition system and an image processing system; the micro-fluidic chip 1 comprises a substrate 10 and a chip main body 11, wherein a first micro-channel 18 and a second micro-channel 17 which are arranged side by side are arranged on the chip main body 11, a transverse micro-channel 165 which enables the first micro-channel 18 and the second micro-channel 17 to be communicated is arranged between the first micro-channel 18 and the second micro-channel 17, oil to be monitored is introduced into the first micro-channel 18, and clean oil is introduced into the second micro-channel 17; the lower surfaces of the first microchannel 18, the second microchannel 17 and the transverse microchannel 165 are all planar; the substrate 10 is provided with a magnetic component 110 corresponding to the transverse microchannel 165, and the magnetic component 110 is arranged on one side of the second microchannel 17 far away from the first microchannel 18; the first microchannel 18 and the second microchannel 17 are provided with an image acquisition area 19 matched with an image acquisition system on one side of the transverse microchannel 165 close to the outlet, and the image acquisition system sends acquired images to an image processing system for processing.

When the monitoring of the abrasive particles is carried out, oil to be monitored is input into the first micro-channel 18, clean oil is input into the second micro-channel 17, the magnetic part 110 works to generate transverse magnetic force, when the oil to be monitored flows into an area corresponding to the transverse micro-channel 165, ferromagnetic abrasive particles can penetrate through the transverse micro-channel 165 to enter the second micro-channel 17 under the action of the magnetic force, different suction forces can be generated according to different magnitudes of the magnetic force generated by the ferromagnetic abrasive particles, and the ferromagnetic abrasive particles with different magnitudes are sucked to different transverse positions of the second micro-channel 17.

Non-ferromagnetic abrasive particles are left in the first micro-channel 18, the non-ferromagnetic abrasive particles and the ferromagnetic abrasive particles respectively pass through the first micro-channel 18 and the second micro-channel 17 to enter the image acquisition area 19, and the image acquisition system acquires, processes and counts images in the image acquisition area 19. Because circulate non-ferromagnetism grit and ferromagnetism grit respectively in the microchannel of difference, the grit quantity in the first microchannel 18 is still less, can separate the ferromagnetism grit of equidimension not through magnetic force in the second microchannel 17, reduces grit overlap probability to can carry out accurate collection to grit information, and can adopt image acquisition's mode to gather the grit, compare in modes such as electric capacity, inductance, the grit information that can gather is more accurate.

As a specific implementation mode, oil abrasive particle monitoring device

Comprises a micro-fluidic chip 1, an image acquisition system, an image processing system and a sample introduction system. The micro-fluidic chip 1 is used for mutually separating different types of abrasive particles, the image acquisition system is used for acquiring information of the separated abrasive particles, the image processing system is used for processing the acquired image, analyzing types of the abrasive particles and counting the number of the abrasive particles of different types, and the sample introduction system is used for controlling the oil outlet of the micro-fluidic chip 1.

The abrasive particles float up and down to a certain extent in the movement process of the oil, and the metal magnetic abrasive particles are generally positioned at the lower layer of the oil. The mass of the non-metallic abrasive particles is generally less than the mass of the metallic abrasive particles for the same size. And in the floating process, the abrasive particles can also have the problem of overlapping up and down, and the resolution of the abrasive particles is influenced.

The microfluidic chip 1 is made of a transparent material, which may be PDMS or other materials. The micro-fluidic chip 1 comprises a substrate 10 and a chip main body 11, the substrate 10 is used for carrying out structural support on the chip main body 11, the chip main body 11 comprises a first micro-channel 18 and a second micro-channel 17, the first micro-channel 18 and the second micro-channel 17 are aligned side by side and horizontally arranged, oil to be monitored is introduced into the first micro-channel 18, clean oil is introduced into the second micro-channel 17, two ends of the first micro-channel 18 are respectively provided with a first liquid inlet 14 and a first liquid outlet 15, two ends of the second micro-channel 17 are respectively provided with a second liquid inlet 13 and a second liquid outlet 12, and the cross sections of the first micro-channel 18 and the second micro-channel 17 are rectangular.

The two ends of the first micro-channel 18 and the second micro-channel 17 are respectively a first liquid inlet 14, a second liquid inlet 13, a first liquid outlet 15 and a second liquid outlet 12, the cross sections of the first micro-channel and the second micro-channel are circular and are arranged at the top of the substrate, and the liquid inlets and the liquid outlets are respectively connected with an oil inlet pipeline and an oil outlet pipeline.

The oil liquid of the first micro-channel 18 enters from the first liquid inlet 14 and flows out from the first liquid outlet 15 to form waste oil; the oil liquid in the second micro-channel 17 enters from the second liquid inlet 13 and flows out from the second liquid outlet 12 to form waste oil; the flow velocities in the two microchannels are the same and both are relatively slow, forming a laminar flow.

The parts of the first micro-channel 18 and the second micro-channel 17 with rectangular cross-section form an abrasive particle separating area 16 for separating different abrasive particles, and the pipelines between the first liquid inlet 14, the first liquid outlet 15, the second liquid inlet 13 and the second liquid outlet 12 and the pipelines connected with the first liquid inlet, the first liquid outlet and the second liquid outlet are positioned outside the abrasive particle separating area 16.

A fifth separating part 161 and a sixth separating part 162 which are symmetrically arranged are arranged between the first microchannel 18 and the second microchannel 17, a transverse microchannel 165 is formed between the fifth separating part 161 and the sixth separating part 162, the transverse microchannel 165 is arranged towards the direction perpendicular to the axial direction of the first microchannel 18, a magnetic part 110 is arranged on the substrate 10, the magnetic part 110 is arranged corresponding to the transverse microchannel 165, and the magnetic part 110 is positioned on one side of the second microchannel 17, which is far away from the first microchannel 18.

When the ferromagnetic abrasive particles enter the corresponding region of the transverse micro-channel 165, the ferromagnetic abrasive particles are subject to the magnetic force of the magnetic member 110, and move along the transverse micro-channel 165 to the second micro-channel 17, and finally enter the second micro-channel 17.

The first microchannel 18 and the second microchannel 17 are both provided with an image acquisition area 19 matched with an image acquisition system, and the image acquisition area 19 is arranged adjacent to the transverse microchannel 165 and is positioned on one side of the transverse microchannel 165 close to the liquid outlet.

As shown in fig. 1-2, preferably, the abrasive particle collecting area of the second channel is provided with an abrasive particle separating device, since ferromagnetic abrasive particles are attracted into the second micro channel 17 by magnetic force, the magnetic force applied to the ferromagnetic abrasive particles is different according to the size of the ferromagnetic abrasive particles, and for smaller abrasive particles, the smaller abrasive particles are subjected to smaller force, so that the moving distance after the smaller abrasive particles are subjected to the magnetic force is shorter and the smaller abrasive particles are farther from the magnetic component 110; for larger abrasive particles, the force is larger, so the distance moved by the magnetic force is longer and the magnetic part 110 is closer.

The abrasive particle separating device comprises a first separating part 196, a second separating part 197, a third separating part 198 and a fourth separating part 199 which are sequentially arranged from the first microchannel 18 to the second microchannel 17, wherein the first separating part 196, the second separating part 197, the third separating part 198 and the fourth separating part 199 are arranged side by side along the transverse direction of the second microchannel 17, the four groups of separating parts divide the image acquisition area 19 of the second microchannel 17 into 5 acquisition channels, and the ferromagnetic abrasive particle first acquisition microchannel 191, the ferromagnetic abrasive particle second acquisition microchannel 192, the ferromagnetic abrasive particle third acquisition microchannel 193, the ferromagnetic abrasive particle fourth acquisition microchannel 194 and the ferromagnetic abrasive particle fifth acquisition microchannel 195 are respectively arranged from the side of the magnetic part 110 to the second microchannel direction.

The image capture region 19 at the first microchannel 18 forms a non-ferromagnetic abrasive particle capture channel 190.

The widths of the first ferromagnetic abrasive particle collecting micro-channel 191 to the fifth ferromagnetic abrasive particle collecting micro-channel 195 are sequentially reduced, the design can ensure that ferromagnetic abrasive particles with different sizes respectively enter the collecting channels with different widths to be respectively collected, and when ferromagnetic abrasive particles with larger sizes reach the collecting micro-channel with smaller width, the ferromagnetic abrasive particles are difficult to enter and continuously move towards the magnetic part 110, so that the separation disorder is avoided; the ferromagnetic abrasive particles with small sizes are difficult to move to the acquisition channel with large width due to small magnetic force, and although the ferromagnetic abrasive particles possibly continuously move to the acquisition channel with large width, the probability is low, and the measurement is not influenced. Thereby the ferromagnetism grit overlap probability has significantly reduced to because the grit quantity in the non-ferromagnetism grit passageway reduces, also effectively reduced the grit and overlapped the probability, promoted resolution ratio, the resolution ratio of device can reach 1.5 um.

Preferably, in order to prevent ferromagnetic abrasive particles from being caught on the partition member to block the collecting passage, the ends of the first to fourth partition members 199 near the oil outlet are aligned with each other and are successively shortened near the end of the transverse micro passage 165. Thus, ferromagnetic abrasive particles with larger sizes can be more conveniently moved toward the magnetic member 110 to avoid seizing.

Preferably, the first to fourth partition members 199 are provided with a guide slope facing one side of the magnetic member 110, and the guide slope is provided at one end of the first to fourth partition members 199 close to the magnetic member 110, so that ferromagnetic abrasive particles with a larger size close to the end of the partition members can move more smoothly along the guide slope when moving upward. The angle of the guide ramp to the horizontal is preferably 30 °.

Preferably, one end of the fifth partition member 161 close to the transverse microchannel 165 is provided with a first inclined surface 164 facing the second microchannel 17, one end of the sixth partition member 162 facing the transverse microchannel 165 is provided with a second inclined surface 163 facing the second microchannel 17, and the first inclined surface 164 and the second inclined surface 163 are symmetrical to each other through the axial position of the transverse microchannel 165. And the arrangement of the first and second slopes 164 and 163 makes the opening of the transverse microchannel 165 larger toward one end of the second microchannel 17, so that ferromagnetic abrasive particles can more easily enter the second microchannel 17 along the transverse microchannel 165. And the first inclined surface 164 and the second inclined surface 163 each have an angle of preferably 30 ° with the horizontal plane, and the end of the first inclined surface 164 near the second microchannel 17 is flush with the end of the first partition member 196.

Preferably, the flow rates of the clean oil and the oil to be detected are 2 ml/min. The slower flow rate can ensure that the image acquisition system can acquire clear images, and simultaneously ferromagnetic abrasive particles with different sizes have enough time to enter respective channels.

As shown in fig. 3, the image capturing system is preferably a micro-photography system, and includes a transmission light source 2, a reflection light source 6, an objective lens 8, and a photoelectric sensor 7. The transmission light source 2 is correspondingly arranged right below the image acquisition area 19 of the microfluidic chip 1, the objective lens 8 is correspondingly arranged right above the image acquisition area 19 of the microfluidic chip 1, the reflection light source 6 is correspondingly arranged right above the objective lens 8, the photoelectric sensor 7 is correspondingly arranged right above the reflection light source 6, and the photoelectric sensor 7 is electrically connected with the image processing system. The light source enters an image acquisition area 19 of the microfluidic chip 1 through the transmission light source 2, is amplified through the objective lens 8 and then is transmitted to the reflection light source 6 and is emitted to the photoelectric sensor 7, and the photoelectric sensor 7 receives the signal, amplifies the signal again and transmits the signal to an image processing system for processing.

Preferably, the sampling system comprises an objective table 3, an oil pipeline 4 to be detected, a clean oil pipeline, a sampling pump 5 and a waste oil pipeline 9. The objective table 3 is horizontally arranged below the microfluidic chip 1 to support the microfluidic chip, the oil pipeline 4 to be detected is communicated with the first liquid inlet 14, the clean oil pipeline (not shown in the figure) is communicated with the second liquid inlet 13, the sampling pump 5 is provided with two groups in total and is arranged on the oil pipeline 4 to be detected and the clean oil pipeline to be detected so as to convey two kinds of oil to the first liquid inlet 14 and the second liquid inlet 13 respectively, and the waste oil pipeline 9 is provided with two groups in total and is communicated with the first liquid outlet 15 and the second liquid outlet 12 respectively so as to discharge waste oil flowing out from the two channels.

Preferably, the image processing system can process images of the non-ferromagnetic abrasive particles and ferromagnetic abrasive particles by using software such as MATLAB, and the image processing system comprises an image enhancement processing unit, an image separation processing unit, a parameter feature extraction unit and an identification and classification statistical unit. The image is firstly enhanced through an image processing unit; then, the image is divided through an image separation processing unit based on the OTSU principle, and the divided RGB abrasive grain image is converted into a binary image; respectively extracting the parameter characteristics of the abrasive particles in each binary image by a parameter characteristic extraction unit, and extracting the characteristic parameters of the abrasive particles, such as the area, the perimeter, the long axis, the short-long axis ratio, the circularity, the chromaticity mean value, the brightness mean value, the surface fractal dimension and the like; the recognition and classification extraction unit extracts the characteristic parameters of the abrasive particles, judges the types of the abrasive particles by using an image pattern recognition method, counts the states of the abrasive particles of different types, and further judges the running state of the engine.

Preferably, the magnetic member 110 is an electromagnet to achieve precise control.

Compared with the prior art, the method has the following advantages:

1. can distinguish ferromagnetism grit and non-ferromagnetism grit, improve monitoring resolution, under the magnetic field effect, separate ferromagnetism grit and non-ferromagnetism grit, the ferromagnetism grit is according to the particle size difference in the horizontal direction of passageway separately, gets into in each passageway of the image acquisition region 19 of the difference of width, the grit overlap probability that has significantly reduced, the resolution ratio of device can be accurate to 1.5 um.

2. The device has the advantages that the statistical accuracy is improved, the abrasive grain types are judged by using an image mode recognition method according to extracted characteristic parameters such as color, size, shape and appearance, and the quantity of abrasive grains of different types (fatigue abrasive grains, serious sliding abrasive grains, cutting abrasive grains and spherical abrasive grains) is counted. The extraction precision is better.

As a specific embodiment, the method also comprises a method for monitoring the oil abrasive particles, which comprises the following steps

Step 1, turning on a computer, and turning on a light source and all instruments;

step 2, oil to be monitored enters a first micro-channel 18 through a first liquid inlet 14, and clean oil of the same brand enters a second micro-channel 17 through a second liquid inlet 13;

and 3, in the transverse micro-channel 165 and the corresponding region thereof, under the action of a magnetic field, ferromagnetic abrasive particles in the first micro-channel 18 enter the second micro-channel 17 from the transverse micro-channel 165, and metal abrasive particles in the abrasive particle separating device respectively enter different acquisition channels of the image acquisition region 19 in the second micro-channel 17 according to the particle size. The non-ferromagnetic abrasive particles move forward along the axial direction of the first microchannel 18 into the image acquisition region 19.

And 4, the image acquisition system micro-shoots the abrasive particle images in the image acquisition area 19 and sends the abrasive particle images to the image processing system, and the image processing system reinforces and separates the abrasive particle images, extracts parameters, identifies abrasive particle types and performs classified statistics to complete accurate monitoring of the abrasive particles.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.