CN115931977A - Aliasing abrasive particle oil liquid distinguishing and detecting device and detecting method thereof - Google Patents
Aliasing abrasive particle oil liquid distinguishing and detecting device and detecting method thereof Download PDFInfo
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- CN115931977A CN115931977A CN202211420719.1A CN202211420719A CN115931977A CN 115931977 A CN115931977 A CN 115931977A CN 202211420719 A CN202211420719 A CN 202211420719A CN 115931977 A CN115931977 A CN 115931977A
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Abstract
The invention provides a device and a method for distinguishing and detecting aliasing abrasive grain oil, which comprises the following steps: the three-coil microfluid chip is combined with the signal conditioning unit to analyze the characteristics of the overlapped particles through phase, amplitude and the number of wave crests and wave troughs; the three-coil microfluid chip comprises a glass slide and a chip main body arranged on the glass slide; the chip main body comprises an oil filling port, a PDMS substrate, a micro flow channel, an oil outlet, two exciting coils and an induction coil; the excitation coil and the induction coil are respectively wound on the micro-channel and are embedded in the PDMS substrate, one port of the micro-channel is used as an oil filling port, the other port of the micro-channel is used as an oil outlet, and the induction coil is arranged between the two excitation coils; the signal conditioning unit comprises a half-wave rectifying circuit, a low-pass filter circuit, a phase-locked amplifier and a post-amplifier which are electrically connected in sequence. The invention solves the problem that the existing inductive oil detection technology can not distinguish and detect superposed particle signals.
Description
Technical Field
The invention relates to the technical field of oil detection and analysis, in particular to a device and a method for distinguishing and detecting aliasing abrasive particles and oil.
Background
The oil detection and analysis technology is used for quantitatively and qualitatively analyzing the physical and chemical properties and pollutant particles in oil (hydraulic oil, lubricating oil and the like) in mechanical equipment. When more large-size abrasive particles appear in the oil, the abnormal abrasion of a mechanical system is represented. At the moment, if the abrasive grains cannot be found and repaired in time, a domino effect occurs, the abrasive grains are abraded rapidly, the abrasive grains are abraded and increased, vicious circle is kept, and the whole system is broken down. Therefore, the oil product of the mechanical system is timely and effectively detected, and the method is a direct means for preventing accidents and reducing loss.
There are many methods for oil detection, and currently, there are acoustic detection, optical detection, capacitive detection and inductive detection methods as common particle counting methods. Compared with other methods, the inductance detection method is not easily influenced by the quality of the oil sample to be detected and environmental noise, can distinguish ferromagnetic particles from non-ferromagnetic particles simultaneously, and can realize the distinguishing of non-ferrous metals when a specific excitation signal is changed, so that the inductance detection technology is more widely applied. However, the output signal of the device is single in shape and few in characteristic signals, the size and the phase of the abrasive particles can be determined only through the amplitude of the signal, and the signal when multiple particles are detected in a superimposed mode cannot be distinguished.
Disclosure of Invention
According to the technical problem that the existing inductance oil detection technology cannot distinguish and detect superposed particle signals, the aliasing abrasive particle oil distinguishing and detecting device and the detection method thereof are provided. The invention designs a three-coil sensor based on a microfluid chip, which has more signal characteristics and can realize the output characteristic analysis when different materials pass through a three-coil at different intervals.
The technical means adopted by the invention are as follows:
an aliasing abrasive oil distinguishing and detecting device comprises: three coil micro-fluidic chip, the signal conditioning unit who is connected with three coil micro-fluidic chip and the data acquisition card who is connected with the signal conditioning unit, three coil micro-fluidic chip combine the signal conditioning unit through phase place, amplitude and wave crest trough number analysis overlapping particle's characteristic, wherein:
the three-coil microfluidic chip comprises a glass slide and a chip main body arranged on the glass slide; the chip main body comprises an oil filling port, a PDMS substrate, a micro flow channel, an oil outlet, two exciting coils and an induction coil; in the chip body: the two excitation coils and the induction coil are respectively wound on the micro-channel and are embedded in the PDMS substrate, one port of the micro-channel is used as an oil filling port, the other port of the micro-channel is used as an oil outlet, and the induction coil is arranged between the two excitation coils;
the signal conditioning unit comprises a half-wave rectifying circuit, a low-pass filter circuit, a phase-locked amplifier and a post-amplifier which are electrically connected in sequence.
Furthermore, the two excitation coils are wound in opposite directions, the number of turns of the excitation coils is 300, and the diameter of an inner hole is 1300 mu m.
Furthermore, the two exciting coils are connected in parallel on the waveform generator, and two ends of the induction coil are connected with the signal conditioning unit.
Furthermore, the induction coil and the two excitation coils are respectively formed by winding copper wires with the wire diameter of 70 mu m.
The invention also provides an aliasing abrasive particle oil liquid distinguishing and detecting method based on the aliasing abrasive particle oil liquid distinguishing and detecting device, which comprises the following steps:
adhering single 500-micron and 700-micron iron particles and 500-micron and 700-micron copper particles on superfine plastic fibers, controlling the particles to reciprocate in a micro-channel by a stepping motor and intercepting one of the back-and-forth signals;
when a single iron particle passes through the three-coil microfluid chip, two wave crests and wave troughs appear in an output signal, the wave crest signal and the wave trough signal are different in size, and the signal is symmetrical about a central point;
when a single copper particle passes through the three-coil microfluidic chip, two peaks and two troughs appear in an output signal, but the trough signal is obvious, and the signal is not symmetrical about a central point.
Further, the aliasing abrasive particle oil liquid distinguishing and detecting method further comprises the following steps:
adhering 500-micron iron particles and 700-micron copper particles with the distances of 0mm, 1mm, 2mm and 3mm to superfine plastic fibers respectively, controlling the particles to reciprocate in a micro-channel by a stepping motor control sliding table, and intercepting one of the back-and-forth signals;
when the particle spacing is 0mm, the copper particles firstly enter the exciting coil, so the initial phase is the same as that of the copper particles, and when the iron particles enter the exciting coil, only part of the copper particles are left in the exciting coil, so the wave peak value of the iron particles is weakened, the output signal is similar to the copper particles, but two wave peaks and three wave troughs are generated, and the amplitude is different;
when the distance between the particles is 1mm, because two particles can partially appear in two exciting coils at the same time, the amplitude of a signal is reduced, the signal at the moment can have three wave crests and wave troughs, and the initial phase of the particles with the same property when passing through cannot be changed;
when the distance between the particles is 2mm, the signal has three wave crests and wave troughs, but the amplitude is different;
when the distance between the particles is 3mm, the signal has four peaks and valleys.
Further, the aliasing abrasive particle oil liquid distinguishing and detecting method further comprises the following steps:
adhering 500-micron copper particles and 700-micron iron particles with the distances of 0mm, 1mm, 2mm and 3mm to superfine plastic fibers respectively, controlling the particles to reciprocate in a micro-channel by a stepping motor and intercepting one of the signals back and forth;
when the distance between two particles is 0mm, compared with a signal of a single iron particle with the size of 700 mu m, the signal only has change in amplitude, and the signal has two wave crests and wave troughs;
when the distance between the particles is 1mm, three wave crests and two wave troughs appear in the signal;
when the distance between the particles is 2mm, three wave crests and three wave troughs appear in the signal, and the amplitude values are different;
when the distance between the particles is 3mm, the signal has three peaks and four valleys.
Further, the aliasing abrasive particle oil liquid distinguishing and detecting method further comprises the following steps:
adhering two 700-micron copper particles with the distances of 0mm, 1mm, 2mm and 3mm to superfine plastic fibers respectively, controlling the particles to reciprocate in a micro-channel by a stepping motor control sliding table, and intercepting one of the reciprocating signals;
when the particle pitch is 0mm, since the sum of the diameters of two 700 μm copper particles is 1.4mm and the width of the excitation coil is 1mm, two copper particles cannot be simultaneously present in the excitation coil, and thus the influence on the signal amplitude is small;
when the distance between the particles is 1mm, because two particles can partially appear in two exciting coils at the same time, the amplitude of a signal is reduced, the signal at the moment can have three wave crests and wave troughs, and the initial phase of the particles with the same property when passing through cannot be changed;
when the distance between the particles is 2mm, the signal has three peaks and three troughs, but the amplitude and the signal change trend are different;
when the distance between the particles is 3mm, the signal has four peaks and valleys.
Further, the aliasing abrasive particle oil liquid distinguishing and detecting method further comprises the following steps:
adhering two 500-micron iron particles with the distances of 0mm, 1mm, 2mm and 3mm to superfine plastic fibers respectively, controlling the particles to reciprocate in a micro-channel by a stepping motor control sliding table, and intercepting one of the reciprocating signals;
when the particle distance is 0mm, two 500-micrometer iron particles can be simultaneously present in the exciting coil, so that the influence on the signal amplitude is large, the maximum wave peak value is 400mV, the maximum wave valley value is 390mV, two wave peaks and wave valleys can be generated, the waveform at the time is similar to the signal generated by a single 700-micrometer iron particle, but the values of the two wave peaks and the wave valleys are different, and therefore the two wave peaks and the wave valleys can be distinguished through the values of the two wave peaks and the wave valleys;
when the distance between the particles is 1mm, because two particles can partially appear in two exciting coils at the same time, the amplitude of a signal is reduced, the signal at the moment can have three wave crests and wave troughs, and the initial phase of the particles with the same property when passing through cannot be changed;
when the distance between the particles is 2mm, the signal has three wave crests and wave troughs, but the amplitude values are different;
when the distance between the particles is 3mm, the signal has four peaks and valleys.
Compared with the prior art, the invention has the following advantages:
the aliasing abrasive oil distinguishing and detecting device and the detection method thereof provided by the invention can realize the output characteristic analysis when aliasing abrasive particles of different materials pass through the three coils at different intervals.
Based on the reasons, the invention can be widely popularized in the fields of oil detection and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a block diagram of a three coil microfluidic chip of the present invention.
FIG. 2 is a flow chart of the detection device of the present invention.
Fig. 3 shows induced voltages for individual particles of different sizes and materials provided by an embodiment of the present invention.
Fig. 4 shows induced voltages of 500um iron particles and 700um copper particles at different spacings according to an embodiment of the present invention.
FIG. 5 shows induced voltages of 500 μm copper particles and 700 μm iron particles at different spacings according to an embodiment of the present invention.
Fig. 6 shows induced voltages of 2 700 μm copper particles at different pitches according to an embodiment of the present invention.
Fig. 7 shows induced voltages of 2 iron particles of 500 μm at different pitches according to an embodiment of the present invention.
In the figure: 1. an oil filling port; 2. a PDMS substrate; 3. a micro flow channel; 4. glass slide; 5. an oil outlet; 6. a first exciting coil; 7. an induction coil; 8: a second exciting coil; 9. a three coil microfluidic chip circuit diagram; 10. a signal conditioning unit; 11. a data acquisition card; 12. a half-wave rectifier circuit; 13. a low-pass filter circuit; 14. a phase-locked amplifier; 15. a post amplifier.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, 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 with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the directions or positional relationships indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the directions or positional relationships shown in the drawings for the convenience of description and simplicity of description, and that these directional terms, unless otherwise specified, do not indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
For ease of description, spatially relative terms such as "over … …", "over … …", "over … …", "over", etc. may be used herein to describe the spatial positional relationship of one device or feature to another device or feature as shown in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and unless otherwise stated, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.
The invention provides a device for distinguishing and detecting aliasing abrasive particle oil, which comprises: three coil micro-fluidic chip, signal conditioning unit 10 and the data acquisition card 11 of being connected with signal conditioning unit 10 that are connected with three coil micro-fluidic chip, three coil micro-fluidic chip combine signal conditioning unit 10 through phase place, amplitude, and wave crest and trough quantity analysis overlap the characteristic of granule, wherein:
as shown in fig. 1, the three-coil microfluidic chip includes a glass slide 4 and a chip body disposed on the glass slide 4; the chip main body comprises an oil filling port 1, a PDMS substrate 2, a micro flow channel 3, an oil outlet, two exciting coils (a first exciting coil 6 and a second exciting coil 8) and an induction coil 7; in the chip body: the first excitation coil 6, the second excitation coil 8 and the induction coil 7 are respectively wound on the micro-channel 3 and are embedded in the PDMS substrate 2, one port of the micro-channel 3 is used as the oil filling port 1, the other port of the micro-channel is used as the oil outlet 5, and the induction coil 7 is arranged between the first excitation coil 6 and the second excitation coil 8; in this embodiment, a method of fabricating a three-coil microfluidic chip is provided, as follows:
the first excitation coil 6, the induction coil 7 and the second excitation coil 8 are arranged side by side in sequence, and penetrate through a 1300-micron copper wire, the copper wire is fixed on a carrying fragment, the carrying fragment is wrapped by using a mold, PDMS and a curing agent are mixed according to the proportion of 10. PDMS was poured into a mold and dried in a vacuum oven for 30 minutes to cure. And after solidification, drawing out the copper wire to form a micro-channel, and finishing the manufacture of the three-coil micro-fluid chip.
In specific implementation, as a preferred embodiment of the present invention, the first and second excitation coils 6 and 8 and the induction coil 7 are each formed by winding a copper wire having a wire diameter of 70 μm. The first excitation coil 6 and the second excitation coil 8 are reversely wound, the number of turns of the first excitation coil 6 and the second excitation coil 8 is 300, and the diameter of an inner hole is 1300 mu m.
In specific implementation, as a preferred embodiment of the present invention, as shown in fig. 2, the first excitation coil 6 and the second excitation coil 8 are connected in parallel at a voltage U in The two ends of the induction coil 7 are connected with the signal conditioning unit 10. In FIG. 2, M 1 And M 2 L1 is an excitation coil and an induction coil. Excitation signal U in A sinusoidal signal is emitted by the waveform generator. Output induction signal U out The sine alternating current signal is converted into a direct current signal through a signal conditioning circuit, and finally the direct current signal is converted into a digital signal through a data acquisition card 11 and stored in a computer. The signal conditioning unit comprises a half-wave rectifying circuit 12, a low-pass filter circuit 13, a phase-locked amplifier 14 and a post-amplifier 15 which are electrically connected in sequence.
Example 1
The invention provides an aliasing abrasive particle oil liquid distinguishing and detecting method based on the aliasing abrasive particle oil liquid distinguishing and detecting device, which comprises the following steps:
adhering single iron particles of 500 micrometers and 700 micrometers and copper particles of 500 micrometers and 700 micrometers to superfine plastic fibers, controlling the particles to reciprocate in the micro flow channel 3 by a stepping motor controlled sliding table, and intercepting one of the back-and-forth signals; as shown in fig. 3, induced electromotive forces generated from passing through the three-coil microfluidic chip are four kinds of particles.
When a single iron particle passes through the three-coil microfluid chip, two wave crests and wave troughs appear in an output signal, the wave crest signal and the wave trough signal are different in size, and the signal is symmetrical about a central point;
when a single copper particle passes through the three-coil microfluidic chip, two peaks and two troughs appear in an output signal, but a trough signal is obvious and the signal is not symmetrical about a central point.
Example 2
The invention provides an aliasing abrasive particle oil liquid distinguishing and detecting method based on the aliasing abrasive particle oil liquid distinguishing and detecting device, which comprises the following steps:
adhering 500-micron iron particles and 700-micron copper particles with the distances of 0mm, 1mm, 2mm and 3mm to superfine plastic fibers respectively, controlling the particles to reciprocate in the micro-channel 3 by a stepping motor to control a sliding table, and intercepting one of the signals back and forth; as shown in fig. 4, is the induced electromotive force of a particle from passing through a three-coil microfluidic chip.
When the distance between the particles is 0mm, the copper particles firstly enter the exciting coil, so the initial phase is the same as that of the copper particles in the figure 3, and when the iron particles enter the exciting coil, only part of the copper particles are left in the exciting coil, so the wave peak value of the iron particles is weakened, the output signal is similar to the copper particles, but two wave peaks and three wave troughs are generated, and the amplitude is different;
when the distance between the particles is 1mm, because two particles can partially appear in two exciting coils at the same time, the amplitude of a signal is reduced, the signal at the moment can have three wave crests and wave troughs, and the initial phase of the particles with the same property when passing through cannot be changed;
when the distance between the particles is 2mm, the signal has three wave crests and wave troughs, but the amplitude values are different;
when the distance between the particles is 3mm, the signal has four peaks and valleys.
Example 3
The invention provides an aliasing abrasive particle oil liquid distinguishing and detecting method based on the aliasing abrasive particle oil liquid distinguishing and detecting device, which comprises the following steps: adhering 500-micron copper particles and 700-micron iron particles with the distances of 0mm, 1mm, 2mm and 3mm to superfine plastic fibers respectively, controlling the particles to reciprocate in a micro-channel by a stepping motor control sliding table, and intercepting one of the back-and-forth signals; as shown in fig. 5, is the induced electromotive force of a particle from a microfluidic chip through a tri-coil.
When the distance between two particles is 0mm, compared with a signal of a single iron particle with the size of 700 mu m, the signal only has change in amplitude, and the signal has two wave crests and wave troughs;
when the distance between the particles is 1mm, three wave crests and two wave troughs appear in the signal;
when the distance between the particles is 2mm, three wave crests and three wave troughs appear in the signal, and the amplitude values are different;
when the distance between the particles is 3mm, the signal has three peaks and four valleys.
Example 4
The invention provides an aliasing abrasive particle oil liquid distinguishing and detecting method based on the aliasing abrasive particle oil liquid distinguishing and detecting device, which comprises the following steps:
adhering two 700-micron copper particles with the distance of 0mm, 1mm, 2mm and 3mm to superfine plastic fibers respectively, controlling the particles to reciprocate in a micro-channel by a stepping motor controlled sliding table, and intercepting one of the reciprocating signals; as shown in fig. 6, is the induced electromotive force generated by the particles from the microfluidic chip by the three coils.
When the particle spacing is 0mm, since the sum of the diameters of two 700 μm copper particles is 1.4mm and the width of the excitation coil is 1mm, two copper particles cannot be simultaneously present in the excitation coil, and thus the influence on the signal amplitude is small;
when the distance between the particles is 1mm, because two particles can partially appear in two exciting coils at the same time, the amplitude of a signal is reduced, the signal at the moment can have three wave crests and wave troughs, and the initial phase of the particles with the same property when passing through cannot be changed;
when the distance between the particles is 2mm, the signal has three peaks and three valleys, but the amplitude and the signal change trend are different;
when the distance between the particles is 3mm, the signal has four peaks and valleys.
Example 5
The invention provides an aliasing abrasive particle oil liquid distinguishing and detecting method based on the aliasing abrasive particle oil liquid distinguishing and detecting device, which comprises the following steps:
adhering two 500-micron iron particles with the distances of 0mm, 1mm, 2mm and 3mm to superfine plastic fibers respectively, controlling the particles to reciprocate in a micro-channel by a stepping motor control sliding table, and intercepting one of the reciprocating signals; as shown in fig. 7, is the induced electromotive force of a particle from passing through a three-coil microfluidic chip.
When the particle distance is 0mm, two 500-micrometer iron particles can be simultaneously present in the exciting coil, so that the influence on the signal amplitude is large, the maximum wave peak value is 400mV, the maximum wave valley value is 390mV, two wave peaks and wave valleys can be generated, the waveform at the time is similar to the signal generated by a single 700-micrometer iron particle, but the values of the two wave peaks and the wave valleys are different, and therefore the two wave peaks and the wave valleys can be distinguished through the values of the two wave peaks and the wave valleys;
when the distance between the particles is 1mm, because two particles can partially appear in two exciting coils at the same time, the amplitude of a signal is reduced, the signal at the moment can have three wave crests and wave troughs, and the initial phase of the particles with the same property when passing through cannot be changed;
when the distance between the particles is 2mm, the signal has three wave crests and wave troughs, but the amplitude values are different;
when the distance between the particles is 3mm, the signal has four peaks and valleys.
In summary, the distinguishing detection method for the aliasing abrasive particles in the oil detection analysis provided by the invention can effectively analyze the aliasing abrasive particles by analyzing the initial phase, the number of wave crests and wave troughs and the amplitude of the signal. The conventional sensor is prevented from deviating from the signal analysis only by phase and amplitude due to aliasing of the abrasive particles.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. An aliasing abrasive oil distinguishing and detecting device is characterized by comprising: three coil microfluid chips, the signal conditioning unit of being connected with three coil microfluid chips and the data acquisition card of being connected with the signal conditioning unit, three coil microfluid chips combine signal conditioning unit to pass through the characteristic of phase place, amplitude and crest trough number analysis overlapping particles, wherein:
the three-coil microfluidic chip comprises a glass slide and a chip main body arranged on the glass slide; the chip main body comprises an oil filling port, a PDMS substrate, a micro flow channel, an oil outlet, two exciting coils and induction coils; in the chip body: the two excitation coils and the induction coil are respectively wound on the micro-channel and are embedded in the PDMS substrate, one port of the micro-channel is used as an oil filling port, the other port of the micro-channel is used as an oil outlet, and the induction coil is arranged between the two excitation coils;
the signal conditioning unit comprises a half-wave rectifying circuit, a low-pass filter circuit, a phase-locked amplifier and a post-amplifier which are electrically connected in sequence.
2. The aliasing abrasive fluid distinguishing and detecting device according to claim 1, wherein the two exciting coils are wound in opposite directions, the number of the exciting coils is 300 turns, and the diameter of an inner hole is 1300 μm.
3. The aliasing abrasive grain oil distinguishing and detecting device according to claim 1, wherein two exciting coils are connected on a waveform generator in parallel, and two ends of an induction coil are connected with the signal conditioning unit.
4. The aliasing abrasive particle oil distinguishing and detecting device according to claim 3, wherein the induction coil and the two excitation coils are wound by copper wires with wire diameter of 70 μm.
5. An aliasing abrasive oil distinguishing detection method realized based on the aliasing abrasive oil distinguishing detection device according to any one of claims 1 to 4, characterized by comprising the following steps:
adhering single 500-micron and 700-micron iron particles and 500-micron and 700-micron copper particles to superfine plastic fibers, controlling the particles to reciprocate in a micro flow channel by a stepping motor controlled sliding table, and intercepting one of the back-and-forth signals;
when a single iron particle passes through the three-coil microfluidic chip, two wave crests and wave troughs appear in an output signal, the wave crest signals and the wave trough signals are different in size, and the signals are symmetrical about a central point;
when a single copper particle passes through the three-coil microfluidic chip, two peaks and two troughs appear in an output signal, but the trough signal is obvious, and the signal is not symmetrical about a central point.
6. The method for detecting the aliasing abrasive fluid distinction according to claim 5, further comprising:
adhering 500-micron iron particles and 700-micron copper particles with the distances of 0mm, 1mm, 2mm and 3mm to superfine plastic fibers respectively, controlling the particles to reciprocate in a micro-channel by a stepping motor and intercepting one of the signals back and forth;
when the particle spacing is 0mm, the copper particles firstly enter the exciting coil, so the initial phase is the same as that of the copper particles, and when the iron particles enter the exciting coil, only part of the copper particles are left in the exciting coil, so the wave peak value of the iron particles is weakened, the output signal is similar to the copper particles, but two wave peaks and three wave troughs are generated, and the amplitude is different;
when the distance between the particles is 1mm, because two particles can partially appear in two exciting coils at the same time, the amplitude of a signal can be reduced, the signal at the moment can have three wave crests and wave troughs, and the initial phase of the particles with the same property when the particles pass through cannot be changed;
when the distance between the particles is 2mm, the signal has three wave crests and wave troughs, but the amplitude is different;
when the distance between the particles is 3mm, the signal has four peaks and valleys.
7. The method for detecting the aliasing abrasive fluid distinction according to claim 5, further comprising:
adhering 500-micron copper particles and 700-micron iron particles with the distances of 0mm, 1mm, 2mm and 3mm to superfine plastic fibers respectively, controlling the particles to reciprocate in a micro-channel by a stepping motor and intercepting one of the signals back and forth;
when the distance between two particles is 0mm, compared with a signal of a single iron particle with the size of 700 mu m, the signal only has change in amplitude, and the signal has two wave crests and wave troughs;
when the distance between the particles is 1mm, three wave crests and two wave troughs appear in the signal;
when the distance between the particles is 2mm, the signal has three wave crests and three wave troughs, and the amplitudes are different in size;
when the distance between the particles is 3mm, the signal has three peaks and four valleys.
8. The method for detecting the aliasing abrasive fluid distinction according to claim 5, further comprising:
adhering two 700-micron copper particles with the distances of 0mm, 1mm, 2mm and 3mm to superfine plastic fibers respectively, controlling the particles to reciprocate in a micro-channel by a stepping motor control sliding table, and intercepting one of the reciprocating signals;
when the particle spacing is 0mm, since the sum of the diameters of two 700 μm copper particles is 1.4mm and the width of the excitation coil is 1mm, two copper particles cannot be simultaneously present in the excitation coil, and thus the influence on the signal amplitude is small;
when the distance between the particles is 1mm, because two particles can partially appear in two exciting coils at the same time, the amplitude of a signal is reduced, the signal at the moment can have three wave crests and wave troughs, and the initial phase of the particles with the same property when passing through cannot be changed;
when the distance between the particles is 2mm, the signal has three peaks and three valleys, but the amplitude and the signal change trend are different;
when the distance between the particles is 3mm, the signal has four peaks and valleys.
9. The method for detecting the aliasing abrasive fluid discrimination according to claim 5, further comprising:
adhering two 500-micron iron particles with the distance of 0mm, 1mm, 2mm and 3mm to superfine plastic fibers respectively, controlling the particles to reciprocate in a micro-channel by a stepping motor controlled sliding table, and intercepting one of the reciprocating signals;
when the particle distance is 0mm, two 500-micrometer iron particles can be simultaneously present in the exciting coil, so that the influence on the signal amplitude is large, the maximum wave peak value is 400mV, the maximum wave valley value is 390mV, two wave peaks and wave valleys can be generated, the waveform at the time is similar to the signal generated by a single 700-micrometer iron particle, but the values of the two wave peaks and the wave valleys are different, and therefore the two wave peaks and the wave valleys can be distinguished through the values of the two wave peaks and the wave valleys;
when the distance between the particles is 1mm, because two particles can partially appear in two exciting coils at the same time, the amplitude of a signal is reduced, the signal at the moment can have three wave crests and wave troughs, and the initial phase of the particles with the same property when passing through cannot be changed;
when the distance between the particles is 2mm, the signal has three wave crests and wave troughs, but the amplitude values are different;
when the distance between the particles is 3mm, the signal has four peaks and valleys.
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| CN117470948B (en) * | 2023-10-18 | 2024-06-07 | 苏州仁正智探科技有限公司 | Induction type oil dust signal monitoring and identifying system and method |
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