A wear particle identification system based on planar array coil and its manufacturing method

Abstract

The present invention provides a wear particle identification system based on a planar array coil and a manufacturing method thereof, the system comprising a stepper motor, a precision slide, an inductance detection sensor, an impedance analyzer and a computer; the stepper motor is connected to the inductance detection sensor; the inductance detection sensor comprises a microfluidic chip and a detection unit; the microfluidic chip comprises a glass substrate, a microchannel arranged on the glass substrate, and both ends of the microchannel are open; the detection unit comprises a first planar coil and a second planar coil; the microchannel passes through the inner hole of the first planar coil, and the second planar coil is placed closely below the microchannel and parallel to the microchannel; the impedance analyzer is respectively connected to the lead ends of the first planar coil and the second planar coil; the computer is connected to the impedance analyzer, and is used to generate different waveform signals, and the generated waveform signals are analyzed to determine the shape of the particles passing through the detection unit. The technical solution of the present invention realizes the analysis and identification of the shape of the detected particles by detecting the waveform signals of the particles.

Description

Technical Field

[0001] The present invention relates to the technical field of wear particle detection and identification, and in particular to a wear particle identification system based on a planar array coil and a manufacturing method thereof. Background Art

[0002] Wear is one of the most common forms of failure that causes abnormal operation and failure of various types of machinery and equipment. The size of wear particles suspended in the oil of the lubrication system is also an important information carrier that reflects the internal wear condition of the equipment. When the equipment is working normally, the concentration of abrasive particles in the lubricating oil remains at a low level and the particle size of the abrasive particles is small; when the equipment is abnormally worn, the concentration of abrasive particles in the lubricating oil will increase significantly. If the lubricating oil is not replaced in time, the particle size and concentration of the abrasive particles will gradually increase. When it reaches a certain level, the equipment will not work properly. Metal abrasive particles contain rich tribological information, including composition, shape, size, quantity, etc. This information is very important for judging the wear parts, wear types, wear processes and wear degrees of the equipment. The detection and identification of metal abrasive particles contained in the lubricating oil can not only diagnose the parts of the equipment where the wear failure occurs, but also predict the life of the mechanical equipment, which has important theoretical value for the fault diagnosis and later maintenance of the equipment. However, the existing chips detect and identify particles in the oil by improving the detection flux and detection accuracy, and there is no research on analyzing the shape of particles by the waveform generated by the particles passing through the sensor. Summary of the invention

[0003] According to the technical problems raised above, a wear particle identification system based on planar array coils and a manufacturing method thereof are provided. The present invention determines the shape of particles passing through the detection area by analyzing the waveform presented when the particles pass through the detection area.

[0004] The technical means adopted by the present invention are as follows:

[0005] A wear particle identification system based on a planar array coil includes: a stepping motor, a precision slide, an inductance detection sensor, an impedance analyzer and a computer; wherein:

[0006] A stepper motor is arranged at one end of the precision slide table and connected to the inductance detection sensor to apply an excitation signal to the inductance detection sensor;

[0007] The inductance detection sensor is arranged on the three-axis fine-tuning slide of the precision slide, and is used to detect abrasive particles, and includes a microfluidic chip and a detection unit arranged on the microfluidic chip; wherein the microfluidic chip includes a glass substrate, a microchannel arranged on the glass substrate, and the two ends of the microchannel are open, which are a particle inlet and a particle outlet respectively; the detection unit includes a first planar coil and a second planar coil; the microchannel passes through the inner hole of the first planar coil, and the second planar coil is placed closely below the microchannel and parallel to the microchannel;

[0008] An impedance analyzer is connected to the lead ends of the first planar coil and the second planar coil respectively, and the detection mode is switched by changing the connection mode between the first planar coil and the second planar coil and the impedance analyzer;

[0009] The computer is connected to the impedance analyzer and is used to generate different waveform signals and analyze the generated waveform signals to determine the shapes of particles passing through the detection unit.

[0010] Furthermore, the microchannel is made of a capillary glass tube with an inner diameter of 900 microns and an outer diameter matching the inner diameter of the first planar coil.

[0011] Furthermore, the first planar coil and the second planar coil are both wound by enameled wire, the diameter of the enameled wire is 40-80 microns, and the number of turns is 20-40 turns.

[0012] Furthermore, the inner diameters of the first planar coil and the second planar coil are 1200 micrometers, and the first planar coil and the second planar coil are 1-2 centimeters apart and are placed vertically.

[0013] Furthermore, the generation of signals at different positions after the particle passes through is achieved by changing the lead ends of the first planar coil and the second planar coil, and the signals generated by the inductance detection sensor when the particle passes through different positions are collected by a computer.

[0014] The present invention also provides a method for manufacturing an inductance detection sensor in the wear particle identification system based on the planar array coil, comprising the following steps:

[0015] S1. Making a planar coil: using a winding machine to wind two identical planar coils, namely a first planar coil and a second planar coil;

[0016] S2. Making a detection unit: passing a capillary glass tube for making a microchannel through the center of the first planar coil, and placing a second planar coil close to the lower side of the capillary glass tube and parallel to the microchannel, with the center holes of the first planar coil and the second planar coil 1-2 cm apart, and fixing the positions of the microchannel, the first planar coil and the second planar coil with glue;

[0017] S3. Making an inductance detection sensor: fix the finished detection unit on a glass substrate, pour PDMS, heat and cure it at a constant temperature for 1 hour to form a PDMS matrix, and complete the inductance detection sensor.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] The wear particle identification system based on the planar array coil provided by the present invention can determine the shape of the detected particles in the microchannel through the waveform of the output signal by analyzing the detection signal generated by the particles passing through the detection unit.

[0020] Based on the above reasons, the present invention can be widely promoted in the fields of wear particle detection and identification. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 Schematic diagram of the system of the present invention.

[0023] Figure 2 This is a structural diagram of the inductance detection sensor of the present invention.

[0024] Figure 3 This is a signal diagram obtained when particles of different sizes pass through detection unit a in the present invention.

[0025] Figure 4 This is a signal diagram obtained when particles of different sizes pass through detection unit a in the present invention.

[0026] Figure 5 This is a signal diagram obtained when particles of different sizes pass through detection unit a in the present invention.

[0027] In the figure: 1. particle inlet; 2. particle outlet; 3. microchannel; 4. first planar coil; 5. PDMS substrate; 6. glass substrate; 7. second planar coil. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0031] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0032] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0033] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0034] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0035] like Figure 1 As shown, the present invention provides a wear particle identification system based on a planar array coil, comprising: a stepper motor, a precision slide, an inductance detection sensor, an impedance analyzer and a computer; wherein:

[0036] A stepper motor is arranged at one end of the precision slide table and connected to the inductance detection sensor to apply an excitation signal to the inductance detection sensor;

[0037] like Figure 2 As shown, the inductance detection sensor is arranged on the three-axis fine-tuning slide of the precision slide, and is used to detect abrasive particles, including a microfluidic chip and a detection unit arranged on the microfluidic chip; wherein the microfluidic chip includes a glass substrate 6, a microchannel 3 arranged on the glass substrate 6, and the two ends of the microchannel 3 are open, which are a particle inlet 1 and a particle outlet 2 respectively; the detection unit includes a first planar coil 4 and a second planar coil 7; the microchannel 3 passes through the inner hole of the first planar coil 4, and the second planar coil 7 is placed close to the bottom of the microchannel 3 and parallel to the microchannel 3

[0038] An impedance analyzer is connected to the lead ends of the first planar coil 4 and the second planar coil 7 respectively, and the detection mode is switched by changing the connection mode between the first planar coil 4 and the second planar coil 7 and the impedance analyzer;

[0039] The computer is connected to the impedance analyzer to generate different waveform signals and analyze the generated waveform signals to determine the shape of the particles passing through the detection unit. The particle shapes corresponding to different waveforms are as follows:

[0040] The first case: Figure 3 As shown, a double peak phenomenon appears in the waveform signal, based on which it can be judged that the shape of the particles passing through the inductance detection sensor is spherical and the size of the particles is small;

[0041] The second case: Figure 3 or Figure 4 As shown, a single peak appears in the waveform signal, and a tiny sawtooth waveform appears at the top of the peak. Based on this phenomenon, it can be judged that the shape of the particles passing through the inductive detection sensor is spherical, and the particle size is larger than the particle size in the first case.

[0042] The third situation: Figure 4 As shown, a single peak appears in the waveform signal, and the waveform curve is smooth at the peak, and its peak value is higher than the peak value of the sawtooth waveform. Based on this phenomenon, it can be judged that the shape of the particles passing through the inductive detection sensor is spherical, and the particle size is larger than the particle size in the second case;

[0043] The fourth case: Figure 5 As shown in (a), the waveform signal is a single peak, and the waveform curve at the peak has a small range of sawtooth waveform, and the accompanying inductance value is relatively high. Based on this phenomenon, it can be judged that the shape of the particles passing through the inductance detection sensor is ellipsoidal;

[0044] The fifth case: Figure 5 As shown in (b), the waveform curve rises slowly, but falls quickly and has edges and corners. Based on this phenomenon, it can be judged that the shape of the particles passing through the inductive detection sensor is an irregular shape with a sharp front end and a sphere-like rear end;

[0045] The sixth case: If Figure 5 As shown in (c): The rising and falling processes of the waveform curve are relatively slow, and there are edges and corners, but the edges and corners are slightly smoother than those shown in the fifth case. Based on this phenomenon, it can be judged that the shape of the particles passing through the inductive detection sensor is an irregular shape with a sharp front end and a slightly flat rear end.

[0046] In specific implementation, as a preferred embodiment of the present invention, the microchannel 3 is made of a capillary glass tube with an inner diameter of 900 microns and an outer diameter matching the inner diameter of the first planar coil 4 .

[0047] In specific implementation, as a preferred embodiment of the present invention, the first planar coil 4 and the second planar coil 7 are both wound by enameled wires, the diameter of the enameled wires is 40-80 microns, and the number of turns is 20-40 turns.

[0048] In specific implementation, as a preferred embodiment of the present invention, the inner diameters of the first planar coil 4 and the second planar coil 7 are 1200 microns, and the first planar coil 4 and the second planar coil 7 are 1-2 centimeters apart and are placed vertically.

[0049] In specific implementation, as a preferred embodiment of the present invention, the generation of signals at different positions after the particles pass through is achieved by changing the lead ends of the first planar coil 4 and the second planar coil 7, and the computer collects the signals generated by the inductance detection sensor when the particles pass through different positions. When in use, the first planar coil 4 and the second planar coil 7 are excited by alternating current through a stepping motor, and the wire with particles moves in the detection unit part. The detection unit obtains the inductance changes of the first planar coil 4 and the second planar coil 7 and transmits them to the computer through an impedance analyzer.

[0050] The present invention also provides a method for manufacturing an inductance detection sensor in the wear particle identification system based on the planar array coil, comprising the following steps:

[0051] S1. Making a planar coil: using a winding machine to wind two identical planar coils, namely a first planar coil 4 and a second planar coil 7;

[0052] S2. Make a detection unit: pass the capillary glass tube for making microchannel 3 through the center of the first planar coil 4, and place the second planar coil 7 close to the lower side of the capillary glass tube and parallel to the microchannel 3. The center holes of the first planar coil 4 and the second planar coil 7 are 1-2 cm apart. Use glue to fix the positions of the microchannel 3, the first planar coil 4 and the second planar coil 7.

[0053] S3, manufacturing an inductance detection sensor: fixing the manufactured detection unit on the glass substrate 6, pouring PDMS, and heating and curing at a constant temperature for 1 hour to form a PDMS matrix 5, and completing the inductance detection sensor.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wear particle identification system based on planar array coils, characterized in that: include: Stepper motor, precision slide, inductance detection sensor, impedance analyzer and computer; among which: A stepper motor is arranged at one end of the precision slide table and connected to the inductance detection sensor to apply an excitation signal to the inductance detection sensor; An inductance detection sensor is arranged on a three-axis fine-tuning slide of a precision slide, and is used to detect abrasive particles, comprising a microfluidic chip and a detection unit arranged on the microfluidic chip; wherein the microfluidic chip comprises a glass substrate, a microchannel arranged on the glass substrate, and the two ends of the microchannel are open, which are a particle inlet and a particle outlet respectively; the detection unit comprises a first planar coil and a second planar coil; the microchannel passes through an inner hole of the first planar coil, and the second planar coil is placed closely below the microchannel and parallel to the microchannel; the inner diameters of the first planar coil and the second planar coil are 1200 microns, and the first planar coil and the second planar coil are 1-2 centimeters apart and are placed vertically; The impedance analyzer is connected to the lead ends of the first planar coil and the second planar coil respectively, and the detection mode is switched by changing the connection mode between the first planar coil and the second planar coil and the impedance analyzer; the generation of signals at different positions after the particles pass by is achieved by changing the lead ends of the first planar coil and the second planar coil, and the signals generated by the inductance detection sensor when the particles pass by different positions are collected by a computer; A computer, connected to an impedance analyzer, is used to generate different waveform signals and analyze the generated waveform signals to determine the shape of particles passing through the detection unit; including: The first case: a double peak phenomenon appears in the waveform signal. Based on this phenomenon, it is judged that the shape of the particles passing through the inductance detection sensor is spherical and the size of the particles is small. The second case: a single peak appears in the waveform signal, and a tiny sawtooth waveform appears at the top of the peak. Based on this phenomenon, it is judged that the shape of the particles passing through the inductance detection sensor is spherical, and the particle size is larger than the particle size in the first case; The third case: a single peak appears in the waveform signal, the waveform curve is smooth at the peak, and its peak value is higher than the peak value of the sawtooth waveform. Based on this phenomenon, it is judged that the shape of the particles passing through the inductance detection sensor is spherical, and the particle size is larger than the particle size in the second case; The fourth case: the waveform signal is a single peak, and the waveform curve at the peak has a small range of sawtooth waveform, and the accompanying inductance value is high. Based on this phenomenon, it is judged that the shape of the particles passing through the inductance detection sensor is ellipsoidal; The fifth case: the waveform curve rises slowly, but falls quickly and has edges and corners. Based on this phenomenon, it can be judged that the shape of the particles passing through the inductance detection sensor is an irregular shape with a sharp front end and a sphere-like rear end. The sixth case: The rising and falling processes of the waveform curve are relatively slow, and there are edges and corners, but the edges and corners are slightly smoother than the fifth case. Based on this phenomenon, it is judged that the shape of the particles passing through the inductive detection sensor is an irregular shape with a sharp front end and a slightly flat rear end.

2. The wear particle identification system based on planar array coil according to claim 1, characterized in that: The microchannel is made of a capillary glass tube with an inner diameter of 900 microns and an outer diameter matching the inner diameter of the first planar coil.

3. The wear particle identification system based on planar array coil according to claim 1, characterized in that: The first planar coil and the second planar coil are both wound by enameled wires, the diameter of the enameled wires is 40-80 microns, and the number of turns is 20-40.

4. A method for manufacturing an inductance detection sensor in a wear particle identification system based on a planar array coil according to any one of claims 1 to 3, characterized in that: The steps include: S1. Making a planar coil: using a winding machine to wind two identical planar coils, namely a first planar coil and a second planar coil; S2. Making a detection unit: passing a capillary glass tube for making a microchannel through the center of the first planar coil, and placing a second planar coil close to the lower side of the capillary glass tube and parallel to the microchannel, with the center holes of the first planar coil and the second planar coil 1-2 cm apart, and fixing the positions of the microchannel, the first planar coil and the second planar coil with glue; S3. Making an inductance detection sensor: fix the finished detection unit on a glass substrate, pour PDMS, heat and cure it at a constant temperature for 1 hour to form a PDMS matrix, and complete the inductance detection sensor.

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