An on-line oil monitoring and control method, device and system

Abstract

The present invention discloses an on-line monitoring and control method, device and system for oil fluid, belonging to the technical field of detection equipment. The present invention includes an oil fluid pipeline, the oil fluid pipeline is connected with an outer cylinder through a liquid inlet pipe, an inner cylinder is coaxially arranged inside the outer cylinder, two baffles are arranged in the gap between the outer cylinder and the inner cylinder, an isolation plug is further installed on the outer surface of the inner cylinder, and a filter screen and an isolation plate are inserted on the isolation plug from top to bottom; an electromagnet is coaxially arranged inside the inner cylinder; the outer cylinder, the inner cylinder and the two baffles form a first cavity, and the outer cylinder, the inner cylinder, the isolation plate and the baffles form a second cavity and a third cavity. By controlling the motor, the present invention can drive the output shaft of the motor to rotate periodically clockwise and counterclockwise, so that the baffle moves, thereby realizing relatively continuous detection in the second cavity, and the operation is simple. After detection, the oil fluid is controlled to flow back to the oil fluid pipeline through the liquid outlet pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of detection equipment, and in particular to an oil online monitoring and control method, device and system. Background Art

[0002] Lubricating oil is often used in industrial equipment to provide lubrication for bearings and other structures in the equipment. However, as the use time increases, the equipment often wears out. Therefore, a method of detecting metal abrasive particles in the oil has been developed to estimate the degree of wear. In the early days, it was often detected by iron spectrum detection, but it was more troublesome. Later, optical methods, wear particle sensors, detection methods based on convolutional neural networks, inductance methods, etc. appeared. These methods each have their own advantages and disadvantages.

[0003] Authorization announcement number: CN113640353B discloses a detection method for online monitoring of the abrasive content of oil. A magnet is used to absorb the abrasive in the oil so that the metal abrasive can be absorbed on a cylindrical electrode, causing a change in the capacitance between the two electrodes. The concentration of the metal abrasive in the oil is estimated based on the capacitance data. However, the method has the following disadvantages: it lacks the ability to remove the abrasive in the oil in a timely manner, and the channel needs to be closed before using the magnet for absorption, and then opened for the next detection after the detection, which is inconvenient to operate.

[0004] Authorization announcement number: CN114755396B discloses an oil online monitoring system, which uses a particle counting sensor to detect the concentration of metal abrasive particles in the oil and can remove the metal abrasive particles in time. However, the particle counting sensor requires frequent maintenance, which is inconvenient.

[0005] Therefore, we propose an oil online monitoring and control method, device and system to solve the above problems.

[0006] The above information disclosed in this background technology is only used to increase the understanding of the background technology of the present invention and therefore, it may include information that does not constitute the prior art known to ordinary technicians in this field. Summary of the invention

[0007] The purpose of the present invention is to provide an oil online monitoring and control method, device and system to solve the current market problems raised by the above background technology.

[0008] To achieve the above-mentioned object, the present invention provides an oil online monitoring device, comprising an oil pipeline, wherein the oil pipeline is connected to an outer cylinder through a liquid inlet pipe, an inner cylinder is coaxially arranged inside the outer cylinder, two baffles are arranged in the gap between the outer cylinder and the inner cylinder, an isolation plug is also installed on the outer surface of the inner cylinder, and a filter screen and an isolation plate are plugged into the isolation plug from top to bottom;

[0009] An electromagnet is coaxially arranged inside the inner cylinder;

[0010] The outer cylinder, the inner cylinder and the two baffles form a first cavity, and the outer cylinder, the inner cylinder, the isolation plate and the baffle form a second cavity and a third cavity;

[0011] The inner cylinder and the outer cylinder are respectively provided with a first electrode and a second electrode located in the second cavity, and a third electrode and a fourth electrode located in the third cavity;

[0012] Sealing discs coaxial with the inner cylinder are fixed at both ends of the two baffles;

[0013] Fixed shafts are provided at both ends of the inner cylinder, and bases are provided on the fixed shafts;

[0014] A liquid outlet pipe is further provided on the oil pipeline.

[0015] Preferably, a semi-circular groove is further formed on the inner surface of the inner cylinder, and an isolation sleeve is provided in the groove;

[0016] The groove and the first cavity are on the same side.

[0017] Preferably, it further includes a motor fixed on the base;

[0018] A hollow first gear is fixedly installed on the sealing disc, and the first gear is sleeved on the fixed shaft;

[0019] A second gear is provided on the output shaft of the motor, and the first gear and the second gear are meshed with each other.

[0020] Preferably, the outer cylinder includes a housing body, and a liquid inlet and a liquid outlet are provided on the housing body;

[0021] The liquid inlet pipe is connected to the liquid inlet;

[0022] The liquid outlet pipe is connected to the liquid outlet.

[0023] Preferably, a control valve is further provided on the liquid inlet pipe.

[0024] Preferably, the filter screen and the isolation plate are in sliding fit, and the isolation plate and the outer ring of the filter screen are sealed with each other;

[0025] The outer ring of the filter screen and the isolation plate are in sliding fit with the housing body and are sealed with each other.

[0026] An oil online monitoring system includes an oil online monitoring device, as well as a measurement and control circuit, a quality detection module and an analysis and processing module;

[0027] The measurement and control circuit is electrically connected to the first electrode, the second electrode, the third electrode and the fourth electrode;

[0028] The quality detection module detects the quality of abrasive grains remaining on the filter screen;

[0029] The analysis and processing module processes the oil fluid detection data in the second cavity and the third cavity, as well as the data of the quality detection module.

[0030] Preferably, the quality detection module is a quartz crystal sensor and is electrically connected to the analysis and processing module.

[0031] An on-line oil fluid monitoring and control method is applied to an on-line oil fluid monitoring system, and its steps include:

[0032] S1. Control the motor to drive the baffle to rotate clockwise by 90 degrees, and the oil fluid enters the second cavity through the liquid inlet pipe until the second cavity is filled with oil fluid;

[0033] S2. Control the motor to drive the baffle to reset, and the measurement and control circuit controls the first electrode and the second electrode to be energized to measure the capacitance, denoted as C1, and calculates the concentration data in the oil fluid based on this;

[0034] S3. Draw out a part of the isolation plate until the oil fluid completely flows into the third cavity and the abrasive grains fall onto the filter screen;

[0035] S4. The measurement and control circuit controls the third electrode and the fourth electrode to be energized to measure the capacitance, denoted as C2, and calculates the concentration data in the oil fluid based on this;

[0036] S5. Detect the quality of the abrasive grains on the filter screen through the quality detection module, and calculate the concentration of the abrasive grains in the oil fluid according to the quality data in combination with the volume of the second cavity in step S1;

[0037] S6. The analysis and processing module compares the concentration data obtained in step S2 with the concentration data obtained in S5, and calculates the average value after excluding errors according to the concentration data obtained in S4.

[0038] Preferably, in step S3, it includes:

[0039] S31. Control the electromagnet to be powered off;

[0040] S32. Draw out a part of the isolation plate, wait for the oil fluid to flow into the third cavity and then reset the isolation plate;

[0041] S33. Control the motor to drive the baffle to rotate counterclockwise to scrape off the abrasive grains on the inner wall of the second cavity.

[0042] Compared with the prior art, the beneficial effects of the present invention are:

[0043] (1) The present invention can drive the output shaft of the motor to rotate periodically clockwise and counterclockwise by controlling the motor, so that the baffle moves, thereby achieving relatively continuous detection in the second cavity. The operation is simple, and after the detection, the oil is controlled to flow back into the oil pipeline through the outlet pipe.

[0044] (2) The present invention provides multiple usage states by controlling the angle of the baffle: that is, when the oil flows out directly through the first cavity, it is in an undetected state; when the oil is detected through the second cavity, the abrasive concentration is detected by the change in capacitance; when the oil is detected through the second cavity and the third cavity respectively, and when the quality of the abrasive filter residue is detected through the quality detection module, the detection accuracy can be improved, and the detection in the third cavity is used as compensation to reduce the error between the detection in the second cavity and the detection through quality detection.

[0045] (3) The present invention can achieve timely removal of metal abrasive particles by setting up a filter screen and an isolation plate. The filter screen and the isolation plate can also be driven by external equipment to improve the degree of automation. In conjunction with the periodic reciprocating rotation of the motor, the abrasive particles can also be continuously filtered to maintain the abrasive particle concentration in the oil within an acceptable range.

[0046] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present invention will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0048] Figure 2 for Figure 1 Schematic diagram of the structure after the base is hidden;

[0049] Figure 3 It is a schematic diagram of the internal structure of the outer cylinder of the present invention;

[0050] Figure 4 It is a partial enlarged view of the filter screen and the isolation plate of the present invention;

[0051] Figure 5 It is a system schematic diagram of the present invention;

[0052] Figure 6 It is a schematic diagram of the process of the present invention;

[0053] Figure 7 It is a schematic diagram of the process of step S3 of the present invention.

[0054] In the figure: 1. Oil pipeline; 2. Liquid inlet pipe; 3. Base; 4. Outer cylinder; 5. Sealing disc; 6. Baffle; 7. Motor; 8. Inner cylinder; 9. Electromagnet; 10. Isolation plug; 11. First electrode; 12. Second electrode; 13. Third electrode; 14. Fourth electrode; 15. Groove; 16. Isolation sleeve; 17. Filter screen; 18. Isolation plate; 19. Fixed shaft; 20. First gear; 21. Second gear; 22. Liquid outlet pipe; 23. Control valve; 24. Measurement and control circuit; 25. Quality detection module; 26. Analysis and processing module;

[0055] 401. Outer housing; 402. Liquid inlet; 403. Liquid outlet; 404. First cavity; 405. Second cavity; 406. Third cavity. Specific implementation mode

[0056] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. It should be noted that the drawings are schematic and not drawn to scale. For the sake of clarity and convenience in the figure, the relative sizes and proportions of the parts shown in the figure are exaggerated or reduced in size and illustrated, and any size is only exemplary and not limiting.

[0057] Embodiment 1:

[0058] Please refer to Figures 1 - 4 , an on-line oil monitoring device, including: an oil pipeline 1, the oil pipeline 1 is connected to an outer cylinder 4 through a liquid inlet pipe 2, an inner cylinder 8 is coaxially arranged in the outer cylinder 4, two baffles 6 are arranged in the gap between the outer cylinder 4 and the inner cylinder 8, an isolation plug 10 is further installed on the outer surface of the inner cylinder 8, a filter screen 17 and an isolation plate 18 are inserted on the isolation plug 10 from top to bottom, an electromagnet 9 is coaxially arranged inside the inner cylinder 8, the outer cylinder 4, the inner cylinder 8 and the two baffles 6 form a first cavity 404, the outer cylinder 4, the inner cylinder 8, the isolation plate 18 and the baffle 6 form a second cavity 405 and a third cavity 406, the inner cylinder 8 and the outer cylinder 4 are respectively provided with a first electrode 11 and a second electrode 12 located in the second cavity 405, and a third electrode 13 and a fourth electrode 14 located in the third cavity 406. Sealing discs 5 coaxial with the inner cylinder 8 are fixed at both ends of the two baffles 6, fixed shafts 19 are arranged at both ends of the inner cylinder 8, a base 3 is arranged on the fixed shafts 19, a liquid outlet pipe 22 is further arranged on the oil pipeline 1, a control valve 23 is further arranged on the liquid inlet pipe 2, the filter screen 17 and the isolation plate 18 are in sliding fit, and the isolation plate 18 and the outer ring of the filter screen 17 are sealed with each other; the outer ring of the filter screen 17 and the isolation plate 18 are in sliding fit with the outer housing 401 and are sealed with each other.

[0059] By adopting the above technical solution, when the oil fluid fills the second cavity, through the mutual cooperation of the electromagnet 9, the first electrode 11, and the second electrode 12, the abrasive particles in the oil fluid can be adsorbed, and the concentration of the abrasive particles in the oil fluid can be calculated through the change of the capacitance. After detection, control the electromagnet 9 to stop working. After pulling out a part of the partition plate 18, the oil fluid can fall into the third cavity 406, and then leave through the liquid outlet pipe 22. Through the scraping action of the baffle plate, the abrasive particles can fully fall onto the filter screen 17, and then the filter screen 17 can be cleaned.

[0060] It should be noted that the filter screen 17 and the partition plate 18 can be driven by an external linear drive device to move linearly. In this state, continuous filtration of the oil fluid can be achieved. Among them: the liquid inlet pipe 2, the liquid outlet pipe 22, and the first cavity 404 are connected. Compared with the initial state, the baffle plate 6 has a counterclockwise angle, so that the liquid inlet pipe 2 is directly connected to the second cavity 405, and the partition plate 18 is in a state of being partially pulled out. By controlling the liquid inlet pipe 2 to intermittently enter the oil fluid through the control valve 23, continuous filtration can be controlled.

[0061] A semi-circular groove 15 is also provided on the inner surface of the inner cylinder 8, and a partition sleeve 16 is provided in the groove 15. The groove 15 and the first cavity 404 are on the same side.

[0062] It also includes a motor 7 fixed on the base 3. The sealing disk 5 is fixedly installed with a hollow first gear 20, and the first gear 20 is sleeved on the fixed shaft 19; the output shaft of the motor 7 is provided with a second gear 21, and the first gear 20 and the second gear 21 are meshed with each other.

[0063] The outer cylinder 4 includes a housing 401. The housing 401 is provided with a liquid inlet 402 and a liquid outlet 403. The liquid inlet pipe 2 is connected to the liquid inlet 402, and the liquid outlet pipe 22 is connected to the liquid outlet 403.

[0064] It should be noted that: there is a one-way valve at the connection point of the liquid outlet pipe 22 and the oil fluid pipeline 1, which controls the oil fluid to enter the oil fluid pipeline 1 through the one-way valve and will not flow back into the liquid outlet pipe 22 through the oil fluid pipeline 1. Since this method is relatively common in the prior art, it is not shown.

[0065] As Figure 4 shown, the filter element of the filter screen 17 is located inside the housing 401 and is slightly recessed compared to the outer ring surface of the filter screen 17, so that the outer ring surface can be stuck on the housing 401 to maintain a sealed state. Figure 4 The state where the filter screen and the partition plate 18 are in close contact is also shown. After the oil fluid enters the third cavity 406, insert the partition plate 18 tightly. At this time, the oil fluid in the second cavity 405 has been discharged, so the filter screen 17 can be removed without considering the problem of oil fluid leakage.

[0066] Example 2:

[0067] Please refer to Figure 5 , an on-line oil detection system, including the above-mentioned on-line oil monitoring device, as well as a measurement and control circuit 24, a quality detection module 25 and an analysis and processing module 26. The measurement and control circuit 24 is electrically connected to the first electrode 11, the second electrode 12, the third electrode 13 and the fourth electrode 14. The quality detection module 25 detects the mass of abrasive particles remaining on the filter screen 17, and the analysis and processing module 26 processes the oil detection data in the second cavity 405 and the third cavity 406, as well as the data of the quality detection module 25.

[0068] The quality detection module 25 is a quartz crystal sensor and is electrically connected to the analysis and processing module 26.

[0069] Through the above technical solution, two methods for detecting the abrasive particle concentration are provided and compared. And the data measured in the third cavity 406 can be used as an error compensation for quality detection to correct the possible error of the measured value of the quality detection method. The corrected data can be compared with the measured value in the second cavity 405, and the average value can be calculated, thereby reducing the error of single measurement.

[0070] Among them, the error sources in the detection process include: First, when detecting in the second cavity 405, the abrasive particles in the oil may not be completely adsorbed, resulting in measurement error; Second, some smaller abrasive particles may pass through the filter screen 17 during filtration, resulting in measurement error.

[0071] Example 3:

[0072] Please refer to Figure 6 , an on-line oil monitoring and control method, applied to the above on-line oil monitoring system, and its steps include:

[0073] S1. Control the motor 7 to drive the baffle 6 to rotate clockwise by ninety degrees, and the oil passes through the liquid inlet pipe 2 into the second cavity 405 until the second cavity 405 is filled with oil;

[0074] S2. Control the motor 7 to drive the baffle 6 to reset, and the measurement and control circuit 24 controls the first electrode 11 and the second electrode 12 to be energized to measure the capacitance, denoted as C1, and calculate the concentration data in the oil according to this;

[0075] S3. Pull out part of the isolation plate 18 until the oil completely flows into the third cavity 406 and the abrasive particles fall onto the filter screen 17;

[0076] S4. The measurement and control circuit 24 controls the third electrode 13 and the fourth electrode 14 to be energized to measure the capacitance, denoted as C2, and calculate the concentration data in the oil according to this;

[0077] S5. The quality inspection module 25 detects the quality of the abrasive particles on the filter screen 17, and calculates the concentration of the abrasive particles in the oil based on the quality data and the volume of the second cavity 405 in step S1.

[0078] S6. The analysis and processing module 26 compares the concentration data obtained in step S2 with the concentration data obtained in S5, and calculates the average value after excluding errors based on the concentration data obtained in S4.

[0079] In step S3, it includes:

[0080] S31. Control the electromagnet 9 to cut off the power.

[0081] S32. Pull out a part of the partition plate 18, wait for the oil to flow into the third cavity 406, and then reset the partition plate 18.

[0082] S33. Control the motor 7 to drive the baffle 6 to rotate counterclockwise to scrape off the abrasive particles on the inner wall of the second cavity 405.

[0083] Working principle: In the initial state, the two baffles 6 are in the vertical state. During detection, control the baffle 6 to rotate counterclockwise so that the oil fills the second cavity 405, and the obtained volume is a definite value. The volume of the oil entering is controlled by the control valve 23. Then the baffle 6 resets, and the concentration data of the abrasive particles is detected through the cooperation of the first electrode 11 and the second electrode 12. Then slightly pull out the partition plate 18 so that the oil enters the third cavity 406. The oil is filtered. After it completely enters, the partition plate 18 can be inserted tightly. At this time, the filter screen 17 can be pulled out to detect the quality of the abrasive particles on the filter screen 17.

[0084] The standard parts used in the present invention can all be purchased from the market. The special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding in the prior art. The machines, parts, and equipment all adopt conventional models in the prior art. Coupled with the circuit connection adopting the conventional connection method in the prior art, it will not be elaborated here. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0085] In the description of the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. The meaning of "a plurality" is two or more unless otherwise specifically defined.

[0086] In the present invention, unless otherwise clearly defined or limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0087] In the present invention, unless otherwise clearly defined or limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0088] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples" or "some examples", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not have to be directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0089] In the drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are involved, and other structures can refer to the general design. Without conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0090] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An on-line oil monitoring device, comprising an oil pipeline (1), wherein the oil pipeline (1) is connected to an outer cylinder (4) through a liquid inlet pipe (2), and is characterized in that, An inner cylinder (8) is coaxially arranged inside the outer cylinder (4). Two baffles (6) are arranged in the gap between the outer cylinder (4) and the inner cylinder (8). An isolation insert block (10) is also installed on the outer surface of the inner cylinder (8). A filter screen (17) and an isolation plate (18) are inserted into the isolation insert block (10) from top to bottom. The outer cylinder (4) includes a housing (401). The filter screen (17) and the isolation plate (18) are in sliding fit, and the outer ring of the filter screen (17) and the isolation plate (18) are both in sliding fit with the housing (401). A liquid inlet (402) is provided on the housing (401), and the liquid inlet pipe (2) is connected to the liquid inlet (402). An electromagnet (9) is coaxially arranged inside the inner cylinder (8). The outer cylinder (4), the inner cylinder (8) and the two baffles (6) form a first cavity (404), and the outer cylinder (4), the inner cylinder (8) and the isolation plate (18) respectively form a second cavity (405) and a third cavity (406) with the two baffles (6). The inner cylinder (8) and the outer cylinder (4) are respectively provided with a first electrode (11) and a second electrode (12) located in the second cavity (405), and a third electrode (13) and a fourth electrode (14) located in the third cavity (406). Sealing discs (5) coaxial with the inner cylinder (8) are fixed at both ends of the two baffles (6). Fixed shafts (19) are provided at both ends of the inner cylinder (8), and bases (3) are provided on the fixed shafts (19). A liquid outlet pipe (22) is also provided on the oil pipeline (1).

2. The on-line oil fluid monitoring device according to claim 1, characterized in that: A semi-circular groove (15) is also formed on the inner surface of the inner cylinder (8), and an isolation sleeve (16) is arranged in the groove (15). The groove (15) is on the same side as the first cavity (404).

3. An on-line oil monitoring device according to claim 1, characterized in that: It also includes a motor (7) fixed on the base (3). A hollow first gear (20) is fixedly installed on the sealing disc (5), and the first gear (20) is sleeved on the fixed shaft (19). A second gear (21) is provided on the output shaft of the motor (7), and the first gear (20) and the second gear (21) are meshed with each other.

4. An on-line oil monitoring device according to claim 3, characterized in that: A liquid outlet (403) is also provided on the housing (401). The liquid outlet pipe (22) is connected to the liquid outlet (403).

5. An on-line oil monitoring device according to claim 1, characterized in that: A control valve (23) is also provided on the liquid inlet pipe (2).

6. An on-line oil monitoring device according to claim 4, characterized in that: The isolation plate (18) is sealed with the outer ring of the filter screen (17).

7. An on-line oil monitoring system, characterized in that: It includes an oil liquid on-line monitoring device, a measurement and control circuit (24), a quality detection module (25) and an analysis and processing module (26) as described in claim 6. The measurement and control circuit (24) is electrically connected to the first electrode (11), the second electrode (12), the third electrode (13) and the fourth electrode (14). The quality detection module (25) detects the mass of abrasive particles remaining on the filter screen (17). The analysis and processing module (26) processes the oil liquid detection data in the second cavity (405) and the third cavity (406), and the data of the quality detection module (25).

8. An on-line oil monitoring system according to claim 7, characterized in that: The quality detection module (25) is a quartz crystal sensor and is electrically connected to the analysis and processing module (26).

9. An on-line monitoring and control method for oil fluid, characterized in that: When monitoring and controlling using the on-line oil monitoring system described in claim 8, in the initial state, the two baffles (6) are in the vertical state, and both the liquid inlet (402) and the liquid outlet (403) are communicated with the first cavity (404). The monitoring and control steps include: S1. Control the motor (7) to drive the baffle (6) to rotate counterclockwise by 90 degrees, and the oil enters the second cavity (405) through the liquid inlet pipe (2) until the second cavity (405) is filled with oil; S2. Control the motor (7) to drive the baffle (6) to return to the initial state. The measurement and control circuit (24) controls the first electrode (11) and the second electrode (12) to be energized, measures the capacitance, denoted as C1, and calculates the concentration data in the oil based on this; S3. Pull out a part of the isolation plate (18) until the oil completely flows into the third cavity (406), and the abrasive grains fall onto the filter screen (17); S4. The measurement and control circuit (24) controls the third electrode (13) and the fourth electrode (14) to be energized, measures the capacitance, denoted as C2, and calculates the concentration data in the oil based on this; S5. Detect the mass of the abrasive grains on the filter screen (17) through the quality detection module (25), and calculate the concentration of the abrasive grains in the oil based on the mass data and the volume of the second cavity (405) in step S1; S6. The analysis and processing module (26) compares the concentration data obtained in step S2 with the concentration data obtained in S5, and calculates the average value after excluding errors based on the concentration data obtained in S4.

10. A method for on-line monitoring and control of oil fluid according to claim 9, characterized in that: In step S3, it includes: S31. Control the electromagnet (9) to be powered off; S32. Pull out a part of the isolation plate (18), wait for the oil to flow into the third cavity (406), and then reset the isolation plate (18); S33. Control the motor (7) to drive the baffle (6) to rotate clockwise to scrape off the abrasive grains on the inner wall of the second cavity (405).

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