Metal abrasive particle sensing device and metal abrasive particle detection method based on heterogeneous electromagnetic coils

Abstract

The invention discloses a metal abrasive particle sensing device based on heterogeneous electromagnetic coils and a metal abrasive particle detection method. The device comprises an excitation coil used for generating an alternating magnetic field, an induction coil used for generating induction voltage and a protective layer used for electromagnetic shielding. Wherein the induction coil is wound at the center of the oil pipeline base body; the excitation coil is wound on the heterogeneous framework wrapping the induction coil; the heterogeneous skeleton is composed of two sub-skeletons which have the same structure and are symmetrically arranged in the direction; the maximum groove walls of the two sub-frameworks are fixedly connected together, and the maximum groove walls fixedly connected together are located in the middle of the heterogeneous framework. The protective layer is composed of a buffer gasket and a metal shielding layer; the metal shielding layers are located at left and right ends of the heterogeneous skeleton; the buffer gasket is arranged between the heterogeneous framework and the metal shielding layer; according to the invention, the uniformly distributed alternating magnetic fields are obtained through the exciting coils with different inner diameters, so that the detection accuracy of the metal abrasive particles is improved, the monitoring of the whole drainage basin of the lubricating oil abrasive particles is realized, and the omission ratio is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of online engine monitoring, and in particular to a metal abrasive particle sensing device and a metal abrasive particle detection method based on a heterogeneous electromagnetic coil. Background Art

[0002] The lubrication system is an indispensable and key component of the engine. It significantly extends the service life of the entire system and its various components by reducing friction and wear. As the engine runs, the performance of the lubrication system will fluctuate due to changes in the equipment status. In particular, as the use time of the engine's rotating parts increases, friction and abnormal wear will cause the surface material of the parts to fall off and form abrasive particles.

[0003] The abrasive particles generated by friction and abnormal wear carry rich wear information and circulate in the system with the lubricating oil. The number, size, shape, color and surface characteristics of the abrasive particles can reveal the operating conditions of key components during wear and the wear characteristics of materials. Therefore, the safety and economy of civil aviation engines urgently need monitoring technology that can provide early warning of abnormal wear failures, which can not only prevent further engine loss, but also help understand the wear condition of the engine, so as to take corresponding maintenance measures to ensure the long-term stable operation of the engine.

[0004] At present, there are two main types of wear monitoring technology: offline monitoring and online monitoring. Electromagnetic detection sensors in online monitoring are widely used because of their good sensitivity.

[0005] The inventors have found through research that the electromagnetic monitoring sensors in the prior art still have at least the following defects:

[0006] The uneven distribution of the magnetic field causes the same abrasive particle to produce different monitoring results on different motion trajectories, resulting in low accuracy of the detection results.

[0007] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0008] The purpose of the present invention is to monitor the size and type of metal abrasive particles in oil in real time and improve the accuracy of detection.

[0009] The present invention provides a metal abrasive particle sensing device based on a heterogeneous electromagnetic coil, comprising:

[0010] An excitation coil for generating an alternating magnetic field, an induction coil for generating an induced voltage, and a protective layer for electromagnetic shielding; wherein,

[0011] The induction coil is wound around the center of the oil pipeline matrix;

[0012] The excitation coil is wound on the heterogeneous frame that wraps the induction coil; the heterogeneous frame is composed of two sub-frames with the same structure and symmetrically arranged in the direction; the maximum groove walls of the two sub-frames are fixed together, and the fixed maximum groove walls are located in the middle part of the heterogeneous frame; a coil channel is provided between the two maximum groove walls; the sizes of the groove walls of the sub-frames are different and the inner diameters of the groove walls gradually increase in the transverse direction; a groove for winding the coil is formed between two adjacent groove walls;

[0013] The middle groove sub-coil of the heterogeneous skeleton is connected in series separately from the two end groove sub-coils, the winding direction of the middle groove sub-coil is the same, and the winding direction of the two end groove sub-coils is opposite to that of the middle groove sub-coil;

[0014] The protective layer is composed of a buffer gasket and a metal shielding layer; the metal shielding layer is located at the left and right ends of the heterogeneous skeleton; and the buffer gasket is arranged between the heterogeneous skeleton and the metal shielding layer.

[0015] Preferably, in an embodiment of the present invention, the metal shielding layer is composed of an end plate and an intermediate cylinder wall, and the end plate is provided with a threaded interface for docking with the oil pipeline.

[0016] Preferably, in an embodiment of the present invention, the heterogeneous skeleton includes 8 grooves; and a lead-in opening is provided on the wall of each groove.

[0017] Preferably, in an embodiment of the present invention, the groove wall is an annular disc.

[0018] Preferably, in the embodiment of the present invention, the induction coil and the excitation coil are both enameled wires with red copper cores; and the metal shielding layer is a nickel-iron alloy with high magnetic permeability.

[0019] Preferably, in an embodiment of the present invention, the number of turns of the excitation coil is greater than the number of turns of the induction coil.

[0020] In another aspect of the present invention, a metal wear particle detection method is also provided, which is used for the metal wear particle sensing device based on heterogeneous electromagnetic coils as described above, comprising the steps of:

[0021] S11, presetting the frequency and level of the excitation coil; the preset levels of the middle coil and the two end coils of the excitation coil are different;

[0022] S12, supplying current to the metal abrasive particle sensor device according to a preset frequency and a preset level, the excitation coil generates an alternating magnetic field, and calculating the magnetic field distribution in the oil pipeline matrix according to the parameters of the excitation coil;

[0023] S13, when the metal abrasive particles pass through the area of ​​the induction coil, calculating the induced potential generated in the induction coil; and obtaining the metal abrasive particle parameters according to the induced potential.

[0024] Preferably, in an embodiment of the present invention, the method further comprises: measuring the voltage peak value of the induced current by filtering and amplifying methods, and calculating the relationship between the abrasive particle size parameter and the induced voltage value.

[0025] Preferably, in the embodiment of the present invention, the magnetic field distribution in the oil pipeline matrix is ​​calculated according to the parameters of the excitation coil by the following formula:

[0026]

[0027] In formula (1), B i is the magnetic field distribution in the oil pipeline matrix; W i is the distance from the metal abrasive to the left end of the ith sub-coil; W′ i is the distance from the metal abrasive to the right end surface of the ith sub-coil; r i is the inner radius of the ith sub-coil; R i is the inner radius and outer radius of the ith sub-coil; n1 is the number of turns of the sub-coil; μ0 is the vacuum permeability; I i is the current in the i-th sub-coil.

[0028] Preferably, in the embodiment of the present invention, the induced potential generated in the induction coil is calculated, including the following formula:

[0029]

[0030] In formula (2), E is the induced potential; V0 is the volume of the metal grinding wheel; r s is the inner diameter of the induction coil; μ r is the magnetic permeability of the metal abrasive; n2 is the number of turns of the induction coil; dB t is the change of magnetic induction intensity per unit time; dt is the unit time.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The metal abrasive particle sensing device based on heterogeneous electromagnetic coils provided in the present invention comprises: an excitation coil for generating an alternating magnetic field, an induction coil for generating an induced voltage and a protective layer for electromagnetic shielding; wherein the induction coil is wound around the center of an oil pipeline matrix; the excitation coil is wound around a heterogeneous skeleton wrapping the induction coil; the heterogeneous skeleton is composed of two sub-skeletons with the same structure and symmetrically arranged in direction; the sizes of the groove walls of the sub-skeletons are different and the inner diameters of the groove walls gradually increase laterally; a groove for winding the coil is formed between two adjacent groove walls; the present invention obtains a uniformly distributed alternating magnetic field by setting excitation coils with different inner diameters, thereby improving the accuracy of metal abrasive particle detection, and realizing the monitoring of the entire flow area of ​​lubricating oil abrasive particles, thereby reducing the missed detection rate.

[0033] Furthermore, the metal abrasive particle sensing device based on heterogeneous electromagnetic coils provided in the present invention has the advantages of high speed, high precision, low cost, and a wide range of applications. By detecting and analyzing the information of metal particles in the oil, it can quickly, accurately, low-cost, and maintenance-free online detect contaminants in grease, judge the wear of mechanical equipment, and prevent major failures of mechanical equipment.

[0034] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, and to make the above and other purposes, technical features and advantages of the present invention easier to understand, one or more preferred embodiments are listed below and described in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 It is a schematic structural diagram of the metal abrasive particle sensing device based on heterogeneous electromagnetic coils described in the present invention;

[0037] Figure 2 It is a schematic diagram of the overall structure of the excitation coil described in the present invention;

[0038] Figure 3 is a schematic diagram of magnetic field distribution at different radial positions in the present invention;

[0039] Figure 4 is a schematic diagram of an oil detection system of a metal abrasive particle sensing device based on a heterogeneous electromagnetic coil according to the present invention;

[0040] Figure 5It is an internal structure diagram of the signal processing module of the oil detection system of the present invention;

[0041] Figure 6 is an internal top view of the signal processing module of the oil detection system of the present invention;

[0042] Figure 7 Schematic diagram of the wear particle lower limit detection result of the oil detection system of the present invention;

[0043] Figure 8 is a graph showing the accuracy of the oil detection system of the present invention;

[0044] Fig. 9 It is a step diagram of the metal abrasive particle detection method described in the present invention. DETAILED DESCRIPTION

[0045] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0046] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0047] In this document, the terms "first", "second", etc. are used to distinguish two different elements or parts, and are not used to limit a specific position or relative relationship. In other words, in some embodiments, the terms "first", "second", etc. can also be interchangeable.

[0048] Embodiment 1

[0049] The existing electromagnetic detection sensor has good sensitivity, but due to the uneven distribution of its magnetic field, the same abrasive particle will produce different monitoring results on different motion trajectories, resulting in limited accuracy of the measurement results. There is an error of 10% to 15% in the estimation of the abrasive particle size. In order to improve the accuracy of metal abrasive particle detection, Figure 1 and Figure 2 As shown, in an embodiment of the present invention, a metal abrasive particle sensing device based on a heterogeneous electromagnetic coil is provided, comprising:

[0050] An excitation coil 1 for generating an alternating magnetic field, an induction coil 2 for generating an induced voltage, and protective layers 16 and 17 for electromagnetic shielding; wherein,

[0051] The induction coil 2 is wound around the center of the oil pipeline matrix;

[0052] The excitation coil 1 is wound on a heterogeneous frame that wraps the induction coil 2; the heterogeneous frame is composed of two sub-frames 12 and 13 with the same structure and symmetrically arranged in the direction; the maximum groove walls of the two sub-frames 12 and 13 are fixed together, and the fixed maximum groove walls are located in the middle part of the heterogeneous frame; a coil channel 14 is provided between the two maximum groove walls; the sizes of the groove walls of the sub-frames 12 and 13 are different and the inner diameters of the groove walls gradually increase in the transverse direction; a groove for winding the coil is formed between two adjacent groove walls;

[0053] The middle groove 5-10 sub-coil of the heterogeneous skeleton is separately connected in series with the two end point grooves 4 and 11 sub-coils, the winding direction of the middle groove 5-10 sub-coil is the same, and the winding direction of the two end point grooves 4 and 11 sub-coil is opposite to the winding direction of the middle groove 5-10 sub-coil;

[0054] The protective layer is composed of a buffer gasket 16 and a metal shielding layer 17 ; the metal shielding layer 16 is located at the left and right ends of the heterogeneous skeleton; the buffer gasket 16 is arranged between the heterogeneous skeleton and the metal shielding layer 17 .

[0055] In the embodiment of the present invention, the metal shielding layer 16 is composed of an end plate and an intermediate cylinder wall, which are screwed together by threads. The end plate is provided with a threaded interface for connecting the oil pipeline, and all the enameled wires enter and exit from the threaded interface left on the cylinder wall.

[0056] In an embodiment of the present invention, the heterogeneous skeleton includes 8 grooves; each groove wall is provided with a lead-in opening; the groove wall is an annular disc, and the lead-in opening on the groove wall is used to ensure that the coil winding process of each groove is completely consistent.

[0057] Preferably, in the embodiment of the present invention, the induction coil 2 and the excitation coil 1 are both enameled wires with copper cores; the metal shielding layer 17 is a nickel-iron alloy with high magnetic flux; and the number of turns of the excitation coil 1 is greater than the number of turns of the induction coil 2.

[0058] In actual application scenarios, the enameled wire can use a copper core with a diameter of 0.5 mm; the induction coil 2 has 172 turns, the excitation coil 1 has a total of 416 turns, and the sub-coil has 52 turns; the oil pipeline matrix 3 is made of silicon carbide; the sub-skeletons 12 and 13 are made of photocured polyphenylene sulfide; the buffer gasket 16 is made of polytetrafluoroethylene; and the metal shielding layer 17 is made of nickel-iron alloy.

[0059] The central groove 3 of the oil pipeline matrix can be set to be 22 mm long, 12 mm inner diameter, and 16 mm outer diameter; the inner diameter of the oil pipeline is 10 mm and the outer diameter is 12 mm; the gap between the two sub-parts 12 and 13 of the heterogeneous skeleton is 1.6 mm, and the groove lengths of the sub-coils 4-11 are all 4.2 mm, and the inner and outer diameters are as follows: the inner diameter of the groove of sub-coil 4 is 15 mm and the outer diameter is 21.1 mm, the inner diameter of the groove of sub-coil 5 is 14 mm and the outer diameter is 20.2 mm, the inner diameter of the groove of sub-coil 6 is 22.4 mm and the outer diameter is 28.6 mm, and the inner diameter of the groove of sub-coil 7 is 26 mm and the outer diameter is 32.2 mm. Since the configurations of the sub-skeletons 12 and 13 are exactly the same, the sizes of the remaining grooves are not repeated. From the edge to the center, the thicknesses of the groove walls of a single sub-part of the heterogeneous skeleton are: 1 mm, 1.5 mm, 0.75 mm, 1.5 mm, 1.13 mm, respectively. The lead-in openings 15 on the groove walls are 2 mm deep and 1.5 mm wide. The buffer gasket 16 has an inner diameter of 12 mm, an outer diameter of 34 mm, and a height of 3 mm. The inner diameter of the central cylinder wall of the metal shielding layer 17 is 34 mm, and the outer diameter is 36 mm. The width of the left and right end plates is 4 mm. The inner diameter of the pipe threaded interface is 12 mm, and the outer diameter is 14 mm.

[0060] The metal abrasive particle sensing device based on heterogeneous electromagnetic coils provided in the present invention comprises: an excitation coil for generating an alternating magnetic field, an induction coil for generating an induced voltage and a protective layer for electromagnetic shielding; wherein the induction coil is wound around the center of an oil pipeline matrix; the excitation coil is wound around a heterogeneous skeleton wrapping the induction coil; the heterogeneous skeleton is composed of two sub-skeletons with the same structure and symmetrically arranged in direction; the sizes of the groove walls of the sub-skeletons are different and the inner diameters of the groove walls gradually increase laterally; a groove for winding the coil is formed between two adjacent groove walls; the present invention obtains a uniformly distributed alternating magnetic field by setting excitation coils with different inner diameters, thereby improving the accuracy of metal abrasive particle detection, and realizing the monitoring of the entire flow area of ​​lubricating oil abrasive particles, thereby reducing the missed detection rate.

[0061] Furthermore, the metal abrasive particle detection method of the present invention has the advantages of fast speed, high precision, low cost, and wide application range. By detecting and analyzing the information of metal particles in the oil, it can quickly, accurately, low-cost, and maintenance-free online detect contaminants in grease, judge the wear of mechanical equipment, and prevent major failures of mechanical equipment.

[0062] Embodiment 2

[0063] Based on the first embodiment, Figure 4 , Figure 5 and Figure 6 As shown, the embodiment of the present invention further constructs an oil detection system of a metal abrasive particle sensor device based on a heterogeneous electromagnetic coil, which specifically includes:

[0064] The power supply unit 18, the excitation signal generator 19, the sensor unit 20, the signal processing module 21, the host computer 22 and other five parts, such as Figure 4 Specifically, the signal processing module 21 includes three submodules, namely, a phase-sensitive demodulation module 23, an adjustable signal filtering module 24, and a signal amplifier module 25. Figure 5 The internal structure of the oil detection system signal processing module is shown.

[0065] The interior of the oil detection system signal processing module, such as Figure 5 and Figure 6 As shown, the phase-sensitive demodulation module 23 uses two input signals, one is the sensor detection signal, and the other is the reference signal. It takes the balanced demodulator as the core, and extracts the weak wear signal through a switch multiplier or a phase-sensitive detector internally. The extracted wear signal can be output through two output ports, one is a filtered output port, and the other is a non-filtered output port; the input port 26 is the sensor detection signal, and the input port 27 is the reference signal. It takes the balanced demodulator AD630 as the core, and multiplies the two input signals through a phase-sensitive detector internally, eliminates high-frequency interference through a built-in low-pass filter, and extracts the weak wear signal. The extracted wear signal can be output through the output port 28.

[0066] The adjustable signal filter module 24 uses one input signal, with an active analog filter as the core, and realizes low-pass, high-pass and band-pass filtering effects by adjusting the sliding resistance value, adjusting the filter center frequency, Q value, passband gain, etc. The filtered signal can be output through two output ports, one is the back-end amplified output port, and the other is the non-amplified output port; the input port 29 is the input end, with an active analog filter UAF42 as the core, and realizes low-pass, high-pass and band-pass filtering effects by adjusting the sliding resistance value, adjusting the filter center frequency, Q value, passband gain, etc. The filtered signal can be output through two output ports, output port 30 is the back-end amplified output port, and output port 31 is the non-amplified output port.

[0067] The signal amplifier module 25 uses one input signal, with a high-performance operational amplifier as the core, and achieves signal amplification by adjusting the sliding resistance value and adjusting the closed-loop gain. The amplified signal is output through the output port; the input port 32 is the input end, with the operational amplifier OPA627 as the core, and achieves signal amplification by adjusting the sliding resistance value and adjusting the closed-loop gain. The amplified signal is output through the output port 33.

[0068] In specific implementation, the oil detection system of the metal abrasive particle sensor device based on the heterogeneous electromagnetic coil includes the following steps:

[0069] (1) connecting the excitation signal generator 19 to the induction coil 4 of the metal abrasive particle sensor device to provide a current signal to the excitation coil 4;

[0070] (2) Connect the positive and negative linear power supply unit 18 to the signal processing module 21 to provide a voltage within the range of ±3V-±18V;

[0071] (3) connecting the induction coil 2 of the metal abrasive particle sensor device to the input port 26 of the phase-sensitive demodulation module 23 in the signal processing module;

[0072] (4) connecting the excitation signal generator 19 to the input port 27 of the phase-sensitive demodulation module 23 to provide a signal with the same frequency and phase as the excitation signal;

[0073] (5) Connect the output port 28 of the phase-sensitive demodulation module 23 to the input port 29 of the adjustable signal filter module 24, and keep the low-pass filter cutoff frequency at 100 Hz;

[0074] (6) Connect the output port 31 of the adjustable signal filter module 24 to the input port 32 of the signal amplifier module 25, and keep the amplification factor at 100 times;

[0075] (7) Connecting the output port 33 of the signal amplification module 25 to the host computer 22;

[0076] (8) The two ends of the metal abrasive particle sensor device are connected to the oil pipeline. When ferromagnetic metal particles exist in the oil, the data analysis unit of the host computer displays an upward pulse. When non-ferromagnetic metal particles exist in the oil, the data analysis unit displays a downward pulse, thereby realizing the differential detection of metal abrasive particles in the oil.

[0077] In the embodiment of the present invention, through the oil detection system in this embodiment, the wear particle lower limit detection result is as follows: Figure 7 As shown in the figure, the accuracy results of the oil detection system are as follows: Figure 8 As shown, the metal abrasive particle sensing device based on heterogeneous electromagnetic coils according to the embodiment of the present invention can detect iron particles larger than 150 microns and copper particles larger than 350 microns in oil, and the detection result accuracy is as high as 96.05%.

[0078] Embodiment 3

[0079] Corresponding to the device of the first embodiment, another aspect of the present invention provides a method for detecting metal wear particles, such as Fig. 9 As shown, the steps include:

[0080] S11, presetting the frequency and level of the excitation coil; the preset levels of the middle coil and the two end coils of the excitation coil are different;

[0081] In the embodiment of the present invention, Figure 2As shown, the sub-coils at the two end point grooves 4 and 11 are supplied with alternating current with a frequency of 100KHz and a level of 1.5V, and the sub-coils at the middle grooves 5-10 of the heterogeneous skeleton are supplied with alternating current with a frequency of 100KHz and a level of 3V.

[0082] After the current is passed, the excitation coil 1 will generate a uniformly distributed alternating magnetic field inside the pipeline. The magnetic field distribution result is as follows: Figure 3 Magnetic field distribution at different radial positions is shown.

[0083] S12, supplying current to the metal abrasive particle sensor device according to a preset frequency and a preset level, the excitation coil generates an alternating magnetic field, and calculating the magnetic field distribution in the oil pipeline matrix according to the parameters of the excitation coil;

[0084] In the embodiment of the present invention, the magnetic field distribution in the oil pipeline matrix is ​​calculated according to the parameters of the excitation coil by the following formula:

[0085]

[0086] In formula (1), B i is the magnetic field distribution in the oil pipeline matrix; W i is the distance from the metal abrasive to the left end of the ith sub-coil; W′ i is the distance from the metal abrasive to the right end surface of the ith sub-coil; r i is the inner radius of the ith sub-coil; R i is the inner radius and outer radius of the ith sub-coil; n1 is the number of turns of the sub-coil; μ0 is the vacuum permeability; I i is the current in the i-th sub-coil.

[0087] S13, when the metal abrasive particles pass through the area of ​​the induction coil, calculating the induced potential generated in the induction coil; and obtaining the metal abrasive particle parameters according to the induced potential.

[0088] Calculate the induced potential generated in the induction coil, including the following formula:

[0089]

[0090] In formula (2), E is the induced potential; V0 is the volume of the metal grinding wheel; r s is the inner diameter of the induction coil; μ r is the magnetic permeability of the metal abrasive; n2 is the number of turns of the induction coil; dB t is the change of magnetic induction intensity per unit time; dt is the unit time.

[0091] In the embodiment of the present invention, the metal debris particles are spherical with a radius of r. a, when the debris particles pass through the sensor, the magnetic field balance at the detection coil will be broken, and the change in the axial magnetic flux can be expressed as:

[0092]

[0093] In formula (3), V0 is the volume of the metal abrasive; V0 = 4 / 3πr a 3 ; r s is the inner diameter of the induction coil; μ r is the magnetic permeability of metal abrasive particles; dB t is the change of axial magnetic induction intensity per unit time.

[0094] According to the principle of electromagnetic induction, if the induction coil has n2 turns, the induced electromotive force generated by the induction coil can be obtained:

[0095]

[0096] In formula (4), E is the induced potential; is the change of magnetic flux per unit time; dt is the unit time; n2 is the number of turns of the induction coil.

[0097] By using formula (2) and formula (4), we can get:

[0098]

[0099] make:

[0100]

[0101] When the excitation signal is an alternating current i=I(cos2πft), the induced potential is:

[0102]

[0103] In formula (5), f is the frequency of the current; t is the time; r a is the equivalent diameter of the abrasive particle; I is the current of the excitation signal.

[0104] Furthermore, in an embodiment of the present invention, it also includes: measuring the voltage peak value of the induced current by filtering and amplifying methods, and calculating the relationship between the abrasive particle size parameter and the induced voltage value.

[0105] In summary, the present invention obtains a uniformly distributed alternating magnetic field by setting excitation coils with different inner diameters, thereby improving the accuracy of metal abrasive particle detection, and realizing full-basin monitoring of lubricating oil abrasive particles, thereby reducing the missed detection rate.

[0106] Furthermore, the metal abrasive particle detection method of the present invention has the advantages of fast speed, high precision, low cost, and wide application range. By detecting and analyzing the information of metal particles in the oil, it can quickly, accurately, low-cost, and maintenance-free online detect contaminants in grease, judge the wear of mechanical equipment, and prevent major failures of mechanical equipment.

[0107] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A metal abrasive particle sensing device based on a heterogeneous electromagnetic coil, characterized in that: include: An excitation coil for generating an alternating magnetic field, an induction coil for generating an induced voltage, and a protective layer for electromagnetic shielding; wherein, The induction coil is wound around the center of the oil pipeline matrix; The excitation coil is wound on the heterogeneous frame that wraps the induction coil; the heterogeneous frame is composed of two sub-frames with the same structure and symmetrically arranged in the direction; the maximum groove walls of the two sub-frames are fixed together, and the fixed maximum groove walls are located in the middle part of the heterogeneous frame; a coil channel is provided between the two maximum groove walls; the sizes of the groove walls of the sub-frames are different and the inner diameters of the groove walls gradually increase in the transverse direction; a groove for winding the coil is formed between two adjacent groove walls; The middle groove sub-coil of the heterogeneous skeleton is connected in series separately from the two end groove sub-coils, the winding direction of the middle groove sub-coil is the same, and the winding direction of the two end groove sub-coils is opposite to that of the middle groove sub-coil; The protective layer is composed of a buffer gasket and a metal shielding layer; the metal shielding layer is located at the left and right ends of the heterogeneous skeleton; and the buffer gasket is arranged between the heterogeneous skeleton and the metal shielding layer.

2. The metal abrasive particle sensing device based on heterogeneous electromagnetic coils according to claim 1 is characterized in that: The metal shielding layer is composed of an end plate and an intermediate cylinder wall, and the end plate is provided with a threaded interface for docking the oil pipeline.

3. The metal abrasive particle sensing device based on heterogeneous electromagnetic coils according to claim 2 is characterized in that: The heterogeneous skeleton comprises 8 grooves; each groove wall is provided with a lead opening.

4. The metal abrasive particle sensing device based on heterogeneous electromagnetic coils according to claim 3 is characterized in that: The groove wall is an annular disc.

5. The metal abrasive particle sensing device based on heterogeneous electromagnetic coils according to claim 1 is characterized in that: The induction coil and the excitation coil are both enameled wires with red copper cores; The metal shielding layer is a nickel-iron alloy with high magnetic flux.

6. The metal abrasive particle sensing device based on heterogeneous electromagnetic coils according to claim 5 is characterized in that: The number of turns of the exciting coil is greater than the number of turns of the induction coil.

7. A method for detecting metal wear particles, used in the metal wear particle sensing device based on heterogeneous electromagnetic coils as claimed in any one of claims 1 to 6, characterized in that: Includes steps: S11, presetting the frequency and level of the excitation coil; the preset levels of the middle coil and the two end coils of the excitation coil are different; S12, supplying current to the metal abrasive particle sensor device according to a preset frequency and a preset level, the excitation coil generates an alternating magnetic field, and calculating the magnetic field distribution in the oil pipeline matrix according to the parameters of the excitation coil; S13, when the metal abrasive particles pass through the area of ​​the induction coil, calculating the induced potential generated in the induction coil; and obtaining the metal abrasive particle parameters according to the induced potential.

8. The metal wear particle detection method according to claim 7, characterized in that: Also includes: The voltage peak value of the induced current is measured by filtering and amplifying methods, and the relationship between the abrasive particle size parameter and the induced voltage value is calculated.

9. The metal wear particle detection method according to claim 7, characterized in that: According to the parameters of the excitation coil, the magnetic field distribution in the oil pipeline matrix is ​​calculated by the following formula: In formula (1), B i is the magnetic field distribution in the oil pipeline matrix; W i is the distance from the metal abrasive to the left end of the ith sub-coil; W′ i is the distance from the metal abrasive to the right end surface of the ith sub-coil; r i is the inner radius of the ith sub-coil; R i is the inner radius and outer radius of the ith sub-coil; n1 is the number of turns of the sub-coil; μ0 is the vacuum permeability; I i is the current in the i-th sub-coil.

10. The metal wear particle detection method according to claim 7, characterized in that: The induced potential generated in the induction coil is calculated, including the following formula: In formula (2), E is the induced potential; V0 is the volume of the metal grinding wheel; r s is the inner diameter of the induction coil; μ r is the magnetic permeability of the metal abrasive; n2 is the number of turns of the induction coil; dB t is the change of magnetic induction intensity per unit time; dt is the unit time.

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