Method for analyzing ferromagnetic abrasive particles, data processing system and pq meter comprising same

Abstract

The application discloses a method for analyzing ferromagnetic abrasive particles by using a PQ instrument, a data processing system and a PQ instrument comprising the same. First, the PQ index of a sample to be measured in a uniform distribution state and a uniform deposition state is respectively tested by using the PQ instrument; then, a deposition-to-averaging ratio is calculated by using the PQ index; then, a calculation correlation coefficient of the PQ index and the ferromagnetic abrasive particle content of the sample is obtained by using the deposition-to-averaging ratio; finally, the ferromagnetic abrasive particle content of the sample is obtained by using a formula. The application can not only make up for the defect that the traditional detection method of the PQ instrument cannot detect the ferromagnetic abrasive particle content, but also can roughly judge the size range of the ferromagnetic abrasive particles in the sample, has higher ferromagnetic abrasive particle content detection precision, has good sensitivity for large-size abrasive particle detection, widens the use and research range of the PQ instrument, and makes the abrasive particle detection method in oil analysis more scientific and diversified.

Description

Technical Field

[0001] This invention relates to the field of ferromagnetic abrasive analysis technology, and more specifically, to a method for analyzing ferromagnetic abrasive particles using a PQ instrument, a data processing system, and a PQ instrument comprising the same. Background Technology

[0002] Numerous studies on the mechanisms of wear and abrasive particle formation have revealed that different types of abrasive particles possess relatively fixed morphological characteristics. By detecting and identifying the size, quantity, and material of metallic abrasive particles in lubricating oil, the wear location and degree of the engine can be determined, allowing for targeted engine maintenance. This is of great significance for improving engine reliability. Currently, in domestic and international research, the PQ index and the content of ferromagnetic particles in wear are the most commonly used on-site or laboratory methods for abnormal wear in large equipment, especially large machinery subjected to impact loads, such as gearboxes, hydraulic cylinders, and diesel engine cylinder liners and piston rings. For example, using a PQ analyzer for quantitative and qualitative analysis of ferromagnetic abrasive particles in wind turbine gear oil can effectively provide early warning of rolling bearing wear and prevent equipment accidents, playing a crucial role in the condition monitoring of large units.

[0003] ASTM D8120-17 and NB / SH / T6023-2020 specify relevant standards for the testing methods of ferromagnetic substances in oil samples. Rotary particle quantification (PQ) meters use offline particle quantification (PQ) magnetometers to monitor wear trends in machinery. PQ meters are based on the principle of electromagnetic induction, where oil samples extracted from the machine are subjected to electromagnetic induction. Figure 1 In the magnetic flux field of the instrument's sensing coil, the presence of ferromagnetic materials will cause a change in the amount of magnetic field, thus giving a relative value, namely the PQ index or the content of ferromagnetic abrasive particles. The specific principle is as follows. Figure 1The main components of the PQ instrument's internal coil structure consist of three coils: excitation coil 1, induction coil 2, and balancing coil 3. The induction and balancing coils are located equidistant from both ends of the excitation coil and have equal impedances. When an alternating current is applied to excitation coil 1, a divergent magnetic field with the same distribution appears near both ends of the coil. Since induction coil 2 and balancing coil 3 are coaxially arranged with excitation coil 1 and symmetrically positioned at equidistant ends, theoretically, two equal signals will be induced. A test plane 5 is located near the end of induction coil 2. When there is no sample or the content of ferromagnetic particles in the tested oil sample is zero, the outputs of the induction and balancing coils are equal. When a sample containing ferromagnetic particles approaches the test area, the small magnetic moment of the ferromagnetic particles causes the divergent magnetic field of excitation coil 1 near induction coil 2 to deform, resulting in a larger induced signal generated by induction coil 2 than that generated by balancing coil 3. The imbalance in the outputs of the two coils causes a difference in the output signals between induction coil 2 and balancing coil 3. After amplification, comparison, shaping, and integration of the difference signal, the ferromagnetic size of the ferromagnetic particles in the sample can be characterized. By identifying the magnitude of this signal, a relative numerical content of the ferromagnetic material in the sample (such as the PQ index) can be obtained. However, this index is related to the concentration, size, and spatial distribution of the ferromagnetic material within the coil's induction volume, resulting in low detection accuracy, and only a single data signal (PQ index or ferromagnetic abrasive particle content) can be fed back at a time.

[0004] In general, the content of wear-related ferromagnetic particles in actual oil samples is unknown. Based on the principle of electromagnetic induction, a PQ meter using three sets of coils can obtain the PQ index but cannot determine the content of ferromagnetic abrasive particles. While commercially available insertion-type ferromagnetic analyzers using two sets of coils can detect the content of ferromagnetic abrasive particles, their accuracy is low. Currently, PQ meters can detect the iron content and particle size of gear lubricating oil under gear fatigue life by fitting a third-order polynomial using the least squares method to fit and predict the PQ index and particle size in the oil. However, this method only proves the feasibility of using the PQ index method for wear prediction. It does not address the problem of extremely low accuracy caused by the concentration, size, and spatial distribution of ferromagnetic materials within the coil induction volume, nor does it provide a method for researchers to simultaneously obtain multiple data points, including the PQ index and the content of ferromagnetic abrasive particles in the sample. Therefore, traditional methods for detecting ferromagnetic materials have not yet achieved optimal effectiveness in diagnosing wear faults in actual equipment. Summary of the Invention

[0005] To address the limitations of traditional ferromagnetic material detection instruments, which can only detect a single data result and have low accuracy, and are susceptible to the influence of factors such as the size and concentration of ferromagnetic materials in the sample, this invention proposes a method for two-state testing of samples using a PQ instrument. This method allows operators to simultaneously obtain the PQ index and the content of ferromagnetic abrasive particles, improving the detection effect of the PQ instrument on large-sized abrasive particles and broadening the application and research scope of this type of detection equipment.

[0006] To achieve the above objectives, the present invention provides a method for ferromagnetic abrasive particle analysis using a PQ instrument, characterized by comprising the following steps:

[0007] Step S1: Use a PQ meter to test the PQ index of the sample under the "uniform distribution" state and the "uniform deposition" state, respectively; the PQ index of the sample under the "uniform distribution" state is PQ′. Dis The PQ index of the "uniform deposition" state of the sample under test is PQ′. Dep ;

[0008] Step S2: Using the formula The measured average sedimentation ratio G was calculated. Tes ;

[0009] Step S3: Use formula K Cal =C·G Tes -1.1 Where C is the correlation constant, the calculated correlation coefficient K between the PQ index and the ferromagnetic abrasive content of the sample is obtained. Cal ;

[0010] Step S4: Using the formula The ferromagnetic abrasive content N of the sample was obtained. Cal .

[0011] Based on the principle of obtaining the PQ index using a PQ instrument, it is known that deposited ferromagnetic materials are closer to the induction coil and more densely aggregated. This results in a larger difference in signals between the induction coil and the balancing coil, often leading to a larger output signal than in a uniform state. Since larger particles settle faster, the transition from a uniform distribution state to a uniform deposition state occurs more quickly. During measurement, the faster descent of large abrasive particles allows them to rapidly bridge the transition from a uniform distribution state to a uniform deposition state, making the test results closer to those of a uniform deposition state. This phenomenon is a crucial setting in the method of this invention: larger abrasive particles deposit to the bottom more quickly in the PQ instrument's detection field, resulting in a shorter time-inductance peak curve. Conversely, smaller abrasive particles require longer deposition times, resulting in a longer time-inductance peak curve. The inductance peak value provides information on the abrasive particle content in the sample, while the time value indicates the abrasive particle size. Therefore, the method of this invention can better reflect the actual information of the ferromagnetic abrasive particles contained in the sample.

[0012] Preferably, in step S1, the sample is tested in the sample box of the PQ instrument. The test of the "uniform distribution" state is performed immediately after the sample is shaken and dispersed and taken into the sample box. The test of the "uniform deposition" state is performed after the sample that has undergone the "uniform distribution" state test is placed still until the ferromagnetic abrasive particles in the sample box are completely deposited at the bottom of the sample box.

[0013] Preferably, in step S1, for the test of the "uniform distribution" state, multiple parallel samples are taken for each sample. If the difference in the test results is within ±10PQ, the sample data is considered to meet the state requirements. The PQ index is measured repeatedly for each sample 10 times, and the average value of the PQ index is used to calculate the data PQ′. Dis .

[0014] Preferably, in step S1, for the test of the "uniform deposition" state, if the deviation of the test data results for the same sample within 2 hours before and after is within ±5PQ, it is considered that the ferromagnetic abrasive particles in the sample box have been completely deposited at the bottom of the sample box, and the sample data meets the state requirements; the PQ index is measured 10 times for each sample and the average value is taken to obtain the data PQ′. Dep .

[0015] Preferably, the size range of ferromagnetic abrasive particles in the sample can be qualitatively determined by the time it takes for the sample to change from a "uniformly distributed" state to a "uniformly deposited" state.

[0016] The time duration is inversely related to the average abrasive grain size; the time required for the sample to change from a "uniformly distributed" state to a "uniformly deposited" state is 0.5–4 hours, corresponding to an average ferromagnetic abrasive grain size of 100–5 μm in the sample. Under the same conditions, the shorter the deposition time, the larger the abrasive grain size.

[0017] Preferably, by using the sedimentation ratio G Tes The size can be used to qualitatively determine the size range of ferromagnetic abrasive particles in a sample.

[0018] Among them, the magnitude of the abrasive uniformity ratio changes in the opposite direction to the average size of the abrasive grains; the abrasive uniformity ratio G Tes The value is 1.5–3.5, corresponding to an average abrasive grain size ≤50μm; the abrasive grain uniformity ratio G Tes A value close to 1 corresponds to an average abrasive grain size > 50 μm.

[0019] On the other hand, the present invention provides a data processing system for ferromagnetic abrasive particle analysis using a PQ instrument, characterized in that it is configured in the PQ instrument and includes a data acquisition module and a data analysis module; the data acquisition module acquires the PQ index of the sample in a "uniform distribution" state and a "uniform deposition" state, and the data analysis module performs data analysis according to the above-mentioned method for analyzing ferromagnetic abrasive particles using a PQ instrument.

[0020] In another aspect, the present invention provides a PQ instrument, characterized in that it is configured with the above-mentioned data processing system.

[0021] Compared with the prior art, the above invention has the following advantages or beneficial effects:

[0022] Traditional testing methods, whether using PQ analyzers or other ferrometric analyzers, suffer from limitations: they can only detect the PQ index or the content of ferromagnetic abrasive particles (ppm value) with extremely low accuracy. Furthermore, these techniques cannot ignore the influence of the size of ferromagnetic particles in the sample on the test results. This invention, however, uses a PQ analyzer to perform a two-state test on the sample, which can characterize the actual size of the wear particles in the sample to a certain extent. Simultaneously, the PQ index obtained from the PQ analyzer can be converted into the content of ferromagnetic abrasive particles in the sample. This method not only overcomes the shortcomings of PQ analyzers in directly detecting the content of ferromagnetic abrasive particles or their low accuracy in detecting ferromagnetic abrasive particles, but also allows for a rough determination of the size range of ferromagnetic abrasive particles in the sample. This not only improves the detection effect of PQ analyzers on large-sized abrasive particles but also broadens the application and research scope of PQ analyzers.

[0023] This invention presents a novel operating method based on a PQ analyzer. This method allows for the simultaneous determination of the PQ index of a sample and the content (ppm value) of ferromagnetic abrasive particles. It exhibits excellent detection performance for large-sized abrasive particles. Combined with atomic emission spectrometry, which is more sensitive to the detection of small-sized elements, it enables a better determination of the concentration of ferromagnetic metal elements in the actual sample. Furthermore, the sedimentation-average ratio (G) can better determine the size range of ferromagnetic abrasive particles in the sample. This improves the detection efficiency of abrasive particles using ferrography and broadens the application range of the PQ analyzer. Ultimately, it allows operators to better understand the wear condition of mechanical equipment, optimize maintenance and repair cycles, reduce maintenance costs, optimize oil change intervals, improve equipment safety and reliability, and significantly reduce losses caused by equipment downtime, thus achieving scientific maintenance and management of mechanical equipment. Attached Figure Description

[0024] The invention, its features, shape, and advantages will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference numerals denote like parts throughout the drawings. The drawings are not drawn to scale; their focus is on illustrating the gist of the invention.

[0025] Figure 1 The coil structure inside the PQ instrument;

[0026] Figure 2 This is a schematic diagram of the "uniformly distributed" state of the sample in one embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the "uniform deposition" state of a sample in one embodiment of the present invention;

[0028] Figure 4 This is a flowchart of the sample testing process in the comparative example;

[0029] Figure 5 The test results are for a sample containing abrasive particles of a certain size range in the comparative example.

[0030] Figure 6 This is a flowchart of sample detection in one embodiment of the present invention;

[0031] Figure 7 This is the test result of a sample containing abrasive particles of a certain size range in one embodiment of the present invention;

[0032] Figure 8 This is the test result of a sample containing abrasive particles of mixed size range in one embodiment of the present invention;

[0033] The components are: 1. Excitation coil; 2. Cover plate; 3. Balance coil; 4. Induction coil; 5. Test plane; 6. Sample box cover; 7. Sample box; 8. Oil; 9. Ferromagnetic abrasive particles. Detailed Implementation

[0034] The comparative examples and exemplary embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. It should be understood that all of these exemplary embodiments described are merely some embodiments and examples of the present invention, and not all of them. Rather, these exemplary embodiments are provided so that those skilled in the art can more thoroughly understand this disclosure and to more completely convey the technical content of this disclosure to those skilled in the art.

[0035] The method for ferromagnetic abrasive particle analysis using a PQ instrument, as provided in the specification and claims of this invention, employs a two-state detection method and includes the following steps:

[0036] Step S1: Use a PQ meter to test the PQ index of the sample under the "uniform distribution" state and the "uniform deposition" state, respectively; the PQ index of the sample under the "uniform distribution" state is PQ′. Dis The PQ index of the "uniform deposition" state of the sample under test is PQ′. Dep ;

[0037] Step S2: Using the formula The measured average sedimentation ratio G was calculated. Tes ;

[0038] Step S3: Use formula K Cal =C·G Tes -1.1 Where C is a correlation constant, the calculated correlation coefficient K between the PQ index and the ferromagnetic abrasive content of the sample is obtained. Cal ;

[0039] Step S4: Using the formula The ferromagnetic abrasive content N of the sample was obtained. Cal .

[0040] The technical solution of the present invention will now be described in detail with specific comparative examples and embodiments. It should be noted that the following specific embodiments and examples can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments and examples; and

[0041] The PQ instrument used in the following comparative examples and embodiments is a rotary quantitative three-coil PQ instrument. Of course, other PQ instruments with the same or similar testing functions can be used. The sample preheating, detection and other processes are standard processes of the corresponding reaction devices and are known technologies, so they will not be described in detail here.

[0042] Comparative Example

[0043] See Figure 2The procedure for analyzing ferromagnetic abrasive particles using a PQ analyzer or ferrite analyzer includes shaking the sample, taking samples for direct testing, and outputting the results. The output results vary depending on the equipment; a PQ analyzer typically outputs only the PQ index, while a ferrite analyzer typically outputs only the ferromagnetic abrasive particle content (ppm value).

[0044] See Figure 3 The results of testing lubricating oil containing ferromagnetic abrasive particles of different sizes using a certain type of insertion ferrometer were compared with the results of testing the ferromagnetic material content in the actual samples. The relative errors between the test results and the actual ferromagnetic abrasive particle content were -28%, 2%, -1%, 16%, 41%, 35%, 55%, and 69%, respectively. These results show that while traditional testing methods can obtain data on ferromagnetic abrasive particle content, the size of the ferromagnetic abrasive particles in the sample has a significant impact on the final results. The detection accuracy is better for abrasive particles with a particle size between 5 and 20 μm, but beyond this range, the detection results will have a very large error compared to the actual sample.

[0045] Understandably, existing ferromagnetic detection technologies based on electromagnetic induction primarily rely on multiple coils to obtain induced signals. Standardized samples are used to input signals into the device, which then compares the measured sample signal with the standard signal. Since standard signals are based on a single PQ index or ferromagnetic material content, even with specific algorithms, only the PQ index or ferromagnetic material content of the tested sample can be output. Furthermore, the signal is affected by the concentration, size, and spatial distribution of the ferromagnetic material within the coil's induction volume.

[0046] Example 1

[0047] This embodiment provides a method for testing samples under two states using a PQ instrument. These two states are as follows: Figure 4 The sample's "uniform distribution" state and Figure 5 The sample is placed in a "uniformly deposited" state. The sample is then placed in the sample container 7, and the sample container lid 6 is closed. Through thorough shaking before sampling, the ferromagnetic abrasive particles 9 are ensured to be evenly distributed within the oil 8, thus achieving the desired uniform deposition state after sampling into the sample container. Figure 4 The state shown; however, due to gravity, see [link / reference]. Figure 5 Over time, the ferromagnetic abrasive particles 9 in the sample will gradually deposit at the bottom of the sample container 7. See also... Figure 6 The specific operation process of this embodiment is as follows:

[0048] (1) Prepare several test samples containing abrasive particles of a certain size range, and place the test samples in a constant temperature oven and heat them to 50°C. Control the room temperature to 20-30°C. Turn on the instrument to preheat and perform calibration.

[0049] (2) For a preheated sample, take it out of the oven and shake it several times. After cooling to room temperature, take the sample into the 5ml sample box provided with the equipment through a plastic dropper and record the sampling quality.

[0050] (3) "Uniform Distribution" State Test: Multiple parallel samples are taken for each sample. If the difference in the test results is within ±10PQ, the sample data is considered to meet the state requirements. The PQ index is measured 10 times for each sample, and the average value of the PQ index is used to calculate the data PQ′. Dis ;

[0051] (4) "Uniform Deposition" State Test: The sample that has undergone the "Uniform Distribution" state test is allowed to stand until the ferromagnetic abrasive particles in the sample box are completely deposited at the bottom of the sample box. As a preferred embodiment, if the test data of the same sample within 2 hours before and after is within ±5PQ, it is considered that the ferromagnetic abrasive particles in the sample box have been completely deposited at the bottom of the sample box and the sample data meets the state requirements. The PQ index is measured 10 times for each sample and the average value is taken to obtain the data.

[0052] (5) Substitute the test results of the samples under the two conditions into formula (I) to obtain the measured sedimentation ratio G. Tes :

[0053]

[0054] (6) G Tes Substituting into formula (II), the correlation coefficient K between the sample PQ index and the ferromagnetic abrasive content is obtained. Cal :

[0055] K Cal =C·G Tes -1.1 (II)

[0056] In the formula, C is the correlation constant, which preferably takes a value between 0.40 and 0.50;

[0057] (7) Calculate the coefficient K Cal Compared with the measured sample homogeneity data PQ′ Dis Substituting into formula (III) yields the ferromagnetic abrasive content N of the sample. Cal :

[0058]

[0059] See Figure 7The PQ index and ferromagnetic abrasive content obtained using this method were compared with the actual ferromagnetic material content of the sample. The relative deviations between the theoretical and actual contents were -17%, 16%, -6%, -1%, 6%, -1%, 7%, and 5%, respectively. Using this method, not only were both PQ index and ferromagnetic abrasive content data obtained, but the resulting content was also closer to the actual ferromagnetic abrasive content in the sample. It showed higher accuracy in detecting abrasive particles >10μm, with a deviation within ±8%. In other words, the method of this invention has a wider range of applications, is less affected by the size of ferromagnetic particles in the sample, has higher detection accuracy, and is more scientifically sound.

[0060] Example 2

[0061] The ferromagnetic abrasive grains in actual samples are likely complex and unknown. This embodiment provides a method for testing samples containing abrasive grains of mixed sizes under two conditions using a PQ instrument. The specific operating procedure is similar to that of Embodiment 1. As a preferred embodiment, the five groups of samples to be tested include a mixed sample with abrasive grain sizes <5μm and 5-10μm, a mixed sample with abrasive grain sizes <5 and 20-30μm, a mixed sample with abrasive grain sizes 20-30μm and 50-75μm, a mixed sample with abrasive grain sizes 50-75μm and 75-100μm, and a mixed sample with abrasive grain sizes <5, 20-30μm, and 50-75μm. See also Figure 8 The relative errors between the theoretical content and the actual content of the five complex samples were 1%, -6%, 1%, 3%, and 7%, respectively. The relative error results were within ±8%, which proves that the method can achieve good data feedback even when facing complex samples in reality. It is even more accurate than the detection of single-size ferromagnetic abrasive particles. Traditional methods cannot distinguish the influence of these factors, resulting in very low detection accuracy.

[0062] Example 3

[0063] This embodiment provides a method for determining the abrasive particle size range in a sample using a PQ instrument. The specific operation process is similar to steps (1) to (4) in Embodiment 1. The time required for the sample to change from a "uniformly distributed" state to a "uniformly deposited" state is 0.5 to 4 hours, corresponding to an average size of 100 to 5 μm for the ferromagnetic abrasive particles in the sample. Under the same conditions, the shorter the deposition time, the larger the abrasive particle size. When the time required for the sample to change from a "uniformly distributed" state to a "uniformly deposited" state is 0.5 hours, the average size of the ferromagnetic abrasive particles in the sample is 100 μm. When the time required for the sample to change from a "uniformly distributed" state to a "uniformly deposited" state is 4 hours, the average size of the ferromagnetic abrasive particles in the sample is 5 μm.

[0064] Example 4

[0065] This embodiment provides a method for determining the abrasive particle size range in a sample using a PQ instrument. The specific operation process is similar to steps (1) to (5) in Embodiment 1. The average particle size ratio changes in the opposite direction to the average abrasive particle size; the average particle size ratio G Tes The value is 1.5–3.5, corresponding to an average abrasive grain size ≤50μm; the abrasive grain uniformity ratio G Tes A value close to 1 corresponds to an average abrasive grain size > 50 μm.

[0066] Example 5

[0067] This embodiment provides a data processing system for ferromagnetic abrasive particle analysis using a PQ instrument. The system is configured within the PQ instrument and includes a data acquisition module and a data analysis module. The data acquisition module collects the PQ index of samples under "uniform distribution" and "uniform deposition" states. The data analysis module performs data analysis according to the PQ instrument analysis method described in Embodiment 1 or 4. The PQ indexes of samples under "uniform distribution" and "uniform deposition" states are collected and analyzed by the data processing system. The corresponding ferromagnetic abrasive particle content and ferromagnetic abrasive particle size range are obtained through calculations using formulas (I) to (III).

[0068] Example 6

[0069] This embodiment provides a PQ instrument configured with the data processing system of Embodiment 5. The PQ instrument, while obtaining the PQ index of the sample to be tested, can also obtain the content (ppm value) of ferromagnetic abrasive particles and the approximate range of abrasive particle size, and has excellent detection effect on large-sized abrasive particles.

[0070] In summary, this invention provides a method for performing two-state testing on samples using a PQ instrument. First, the PQ index PQ′ of the sample under test is measured using the PQ instrument for both the "uniform distribution" state and the "uniform deposition" state. Dis With PQ′ Dep Then use the formula The measured average sedimentation ratio G was calculated. Tes Then use formula K Cal =C·G Tes -1.1 The calculated correlation coefficient K between the PQ index and the ferromagnetic abrasive content of the sample was obtained. Cal Finally, use the formula The ferromagnetic abrasive content N of the sample was obtained. CalThis invention also provides a data processing system for ferromagnetic abrasive analysis using a PQ instrument, and a PQ instrument comprising the system. This invention not only overcomes the limitation of traditional PQ instrument detection methods in detecting ferromagnetic abrasive content, but also roughly determines the size range of ferromagnetic abrasives in a sample, and has higher accuracy in detecting ferromagnetic abrasive content. It also exhibits good sensitivity for detecting large-sized abrasives, broadening the application and research scope of the PQ instrument, and making abrasive detection methods in oil analysis more scientific and diverse.

[0071] The methods, theories, or processes not described in detail in this embodiment are existing technologies and will not be elaborated upon here. Those skilled in the art should understand that variations can be implemented by combining existing technologies with the above embodiments, and these variations will not be elaborated upon here. Such variations do not affect the substantive content of this invention and will not be elaborated upon here.

[0072] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0073] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and the devices and structures not described in detail should be understood as being implemented in a conventional manner in the art. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention using the methods and techniques disclosed above, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the present invention. This does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the present invention's technical solutions still fall within the protection scope of the present invention.

Claims

1. A method for ferromagnetic abrasive particle analysis using a PQ instrument, characterized in that, Includes the following steps: Step S1: Use a PQ meter to test the PQ index of the sample under the "uniform distribution" state and the "uniform deposition" state, respectively; the PQ index of the sample under the "uniform distribution" state is... The PQ index of the "uniform deposition" state of the sample under test is: The sample is tested in the sample box of the PQ instrument. The test of the "uniform distribution" state is carried out immediately after the sample is shaken and dispersed and taken into the sample box. The test of the "uniform deposition" state is carried out after the sample that has been tested for "uniform distribution" state is allowed to stand until the ferromagnetic abrasive particles in the sample box are completely deposited at the bottom of the sample box. Step S2: Using the formula Calculated average sedimentation ratio ; Step S3: Using the formula Where C is a correlation constant, the calculated correlation coefficient K between the PQ index and the ferromagnetic abrasive content of the sample is obtained. cal ; Step S4: Using the formula The ferromagnetic abrasive content N of the sample was obtained. cal .

2. The method for ferromagnetic abrasive particle analysis using a PQ instrument according to claim 1, characterized in that, In step S1, for the test of the "uniform distribution" state, multiple parallel samples are taken for each sample. If the difference in the test results is within ±10PQ, the sample data is considered to meet the state requirements. The PQ index is measured 10 times for each sample, and the average value of the PQ index is used to calculate the data. .

3. The method for ferromagnetic abrasive particle analysis using a PQ instrument according to claim 1, characterized in that, In step S1, for the test of the "uniform deposition" state, if the deviation of the test data results for the same sample within 2 hours before and after is within ±5PQ, it is considered that the ferromagnetic abrasive particles in the sample box have been completely deposited at the bottom of the sample box, and the sample data meets the state requirements; the PQ index is measured 10 times for each sample and the average value is taken to obtain the data. .

4. The method for ferromagnetic abrasive particle analysis using a PQ instrument according to claim 1, characterized in that, The size range of ferromagnetic abrasive particles in a sample can be qualitatively determined by measuring the time it takes for the sample to change from a "uniformly distributed" state to a "uniformly deposited" state.

5. The method for ferromagnetic abrasive particle analysis using a PQ instrument according to claim 4, characterized in that, The duration of the time changes in the opposite direction to the average size of the abrasive particles; the time required for the sample to change from a "uniformly distributed" state to a "uniformly deposited" state is 0.5 to 4 hours, corresponding to an average size of 100 to 5 μm for the ferromagnetic abrasive particles in the sample.

6. The method for ferromagnetic abrasive particle analysis using a PQ instrument according to claim 1, characterized in that, By sedimentation ratio The size can be used to qualitatively determine the size range of ferromagnetic abrasive particles in a sample.

7. The method for ferromagnetic abrasive particle analysis using a PQ instrument according to claim 6, characterized in that, The magnitude of the abrasive grain size distribution is inversely related to the average abrasive grain size; the abrasive grain size distribution... The value is 1.5 ~ 3.5, corresponding to an average abrasive grain size ≤ 50 μm; the abrasive grain size ratio is... A value close to 1 corresponds to an average abrasive grain size > 50 μm.

8. A data processing system for ferromagnetic abrasive particle analysis using a PQ instrument, characterized in that, The PQ instrument is configured to include a data acquisition module and a data analysis module; the data acquisition module acquires the PQ index of the sample in a "uniformly distributed" state and a "uniformly deposited" state, and the data analysis module performs data analysis according to the method for analyzing ferromagnetic abrasive particles using the PQ instrument according to any one of claims 1 to 7.

9. A PQ instrument, characterized in that, Configure the data processing system as described in claim 8.

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