CN115615883A - Multi-signal-characteristic three-coil inductive metal particle detection device - Google Patents
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- 238000012805 post-processing Methods 0.000 claims abstract description 18
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- CXQXSVUQTKDNFP-UHFFFAOYSA-N octamethyltrisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C CXQXSVUQTKDNFP-UHFFFAOYSA-N 0.000 claims description 10
- 238000004987 plasma desorption mass spectroscopy Methods 0.000 claims description 10
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 10
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/0656—Investigating concentration of particle suspensions using electric, e.g. electrostatic methods or magnetic methods
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N2015/1024—Counting particles by non-optical means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N2015/1029—Particle size
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Abstract
The invention provides a multi-signal characteristic three-coil inductive metal particle detection device, which comprises: the device comprises a three-coil inductive detection chip and a pulse signal post-processing circuit; the three-coil inductive detection chip is used for sensing inductive signals, and when the micro-coil is used as an excitation coil and an induction coil, the influence of particles on the internal magnetic field of the micro-coil is relatively enhanced, so that two wave crests and wave troughs can appear in the generated induced electromotive force, the characteristic point positions of the signals are increased, and the recognition degree of the signals is improved. The pulse signal post-processing circuit is used for converting the inductance signal into a voltage signal, enhancing the signal-to-noise ratio of the signal by processing means of one-step filtering, amplification and the like, improving the detection precision of the metal particles, finally acquiring the detection signal by a data acquisition card, and transmitting the detection signal to an analysis processing device to display the information such as the number, the size, the concentration and the like of the metal particles. The technical scheme of the invention solves the technical problem of low detection precision of the inductance detection method in the existing oil detection technology.
Description
Technical Field
The invention relates to the technical field of oil state monitoring, in particular to a multi-signal characteristic three-coil inductive metal particle detection device.
Background
The lubricating oil is regarded as blood of mechanical equipment, and is used for reducing friction among moving parts of the mechanical equipment, taking away partial heat among the moving parts of the mechanical equipment, cleaning the surfaces of the moving parts, and effectively preventing corrosion of the parts, so that mechanical faults are avoided, and the service life of the mechanical parts is prolonged. However, a large number of friction pairs exist in various mechanical equipment, a large number of metal particles are suspended in oil generated in the working process, and 80% of component failures are caused by abrasion. When mechanical equipment works normally, the concentration and the size of metal particle pollutants in the lubricating oil are maintained at a lower level, and the particle size is below 20 mu m; when abnormal wear of the machine occurs, the concentration and size of metal particles in the lubricant increase and the particle size reaches 50 to 100 μm. Therefore, the monitoring of the types and the concentrations of the particulate matters in the oil can improve the reliability of the operation of the machine and diagnose the faults of the machine in advance.
At present, the rapid detection method for oil pollutants in engineering mainly comprises an optical detection method, an acoustic detection method, a capacitance method, an inductance method and the like. The optical detection method has the characteristics of high sensitivity and high detection speed, but the detection precision is influenced by the transmittance of oil liquid; the acoustic detection method is interfered by noise and oil temperature; capacitive detection can detect non-metallic contaminants, but cannot detect properties of metallic particles; the inductance detection can be used for distinguishing and detecting the properties of the metal particles.
Disclosure of Invention
According to the technical problem that the detection precision of an inductance detection method in the existing oil detection technology is low, the three-coil inductance type metal particle detection device with multiple signal characteristics is provided. The invention converts the inductive signal sensed by the metal particle detection chip into a voltage signal, and simultaneously forms a direct current signal with zero voltage in an undetected circuit, thereby greatly improving the detection precision of the metal particles. Finally, the data acquisition card acquires detection signals, and the detection signals are transmitted to the analysis processing device to display the information such as the number, the size, the concentration and the like of the metal particles.
The technical means adopted by the invention are as follows:
a multi-signal feature, three-coil inductive metal particle detection apparatus comprising: the device comprises a three-coil inductive detection chip and a pulse signal post-processing circuit connected with the three-coil inductive metal particle detection chip; wherein:
the three-coil inductive detection chip is used for sensing an inductive signal;
the pulse signal post-processing circuit is used for converting an inductive signal induced by the three-coil inductive detection chip into a voltage signal, and simultaneously forming a direct current signal with zero voltage in an undetected circuit, so that the detection precision of metal particles is improved.
Furthermore, the three-coil inductive detection chip comprises a glass slide, a PDMS substrate arranged on the glass slide, a micro-channel embedded in the PDMS substrate, and a coil wound on the micro-channel; wherein:
two ends of the micro-channel are arranged outside the PDMS substrate, one end of the micro-channel is used as an oil inlet, and the other end of the micro-channel is used as an oil outlet;
the coil comprises two excitation coils and a detection coil, wherein the detection coil is arranged between the two excitation coils, and the two excitation coils are wound in opposite directions.
Furthermore, the excitation coil and the detection coil are made of high-conductivity copper materials, the lead is wrapped by the enameled wire and wound into a hollow shape, the heights of the three coils are kept consistent, and metal particles sequentially pass through the excitation coil, the detection coil and the excitation coil.
Further, the pulse signal post-processing circuit comprises an excitation module, a half-wave rectification module, a filter module and an operational amplifier module; wherein:
the excitation module is connected with the two excitation coils and used for providing voltage for the two excitation coils for excitation, and an excitation source is an alternating current power supply;
the half-wave rectification module is connected with the excitation module and used for converting alternating current into pulsating direct current;
the filter module is connected with the detection coil and used for converting an inductive signal induced by the detection coil into a voltage signal and filtering a zero-voltage signal when the circuit is balanced to form a direct-current signal close to zero voltage;
the operational amplifier module is connected with the filter module and used for amplifying the voltage signal of the output signal end, so that the signal output by the post-processing circuit is a direct current signal with zero voltage.
Further, the half-wave rectification module consists of a resistor and a diode and is used for half-wave rectifying alternating current into pulsating direct current.
Furthermore, the three-coil inductive detection chip is arranged in the hydraulic and lubricating system and used for capturing pulse signals generated when the metal particles pass through the three-coil inductive detection chip.
Further, the pulse signal post-processing circuit is connected with a data acquisition module and is used for acquiring the pulse signal generated by the three-coil inductive detection chip and the high signal-to-noise ratio detection signal processed by the pulse signal through the half-wave rectification module, the filter module and the operational amplifier module, and displaying the high signal-to-noise ratio detection signal on an analysis processing device, so that the information of the number, the size and the concentration of the black metal abrasive particles in the hydraulic and lubricating system can be acquired.
Compared with the prior art, the invention has the following advantages:
1. according to the multi-signal characteristic three-coil inductive metal particle detection device, when the micro coil is used as the exciting coil and the induction coil, the influence of particles on the magnetic field inside the micro coil is relatively enhanced, so that two wave crests and wave troughs appear in the generated induced electromotive force, the characteristic point positions of signals are increased, and the identification degree of the signals is improved.
2. The multi-signal characteristic three-coil inductive metal particle detection device provided by the invention solves the problem of low detection precision of an inductive detection method in the existing oil detection technology, can realize real-time online detection of metal particles in a hydraulic system and a lubricating system of each mechanical device, has high detection precision and electrodeless detection flux, is applied to the wear state detection of actual large-scale equipment, and has important social significance and very considerable application prospect in the field of fault diagnosis of the mechanical device.
Based on the reason, the invention can be widely popularized in the fields of oil state monitoring 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 schematic diagram of a three-coil inductive test chip according to the present invention.
Fig. 2 is a schematic diagram of the detection coil structure of the present invention.
FIG. 3 is a schematic diagram of a multi-signal characteristic three-coil inductive metal particle detector in accordance with the present invention.
FIG. 4 is a flow chart of the detection of the multi-signal characteristic three-coil inductive metal particle detecting apparatus of the present invention.
Fig. 5 is a graph of an output signal of copper particles according to an embodiment of the present invention.
Fig. 6 is a graph of an output signal of iron particles according to an embodiment of the present invention.
FIG. 7 is a graph of the signal output of the multi-signal characteristic three-coil inductive metal particle detector of the present invention compared to the output of a conventional three-coil sensor. In the figure: 1. a first excitation coil; 2. a detection coil; 3. a second excitation coil; 4. metal particles; 5. a three-coil inductive detection chip; 6. an excitation module; 7. a half-wave rectification module; 8. a filter module; 9. an operational amplifier module; 10. a data acquisition module; 11. glass slide; 12. a PDMS substrate; 13. a micro flow channel; 14. an oil inlet; 15. and an oil outlet.
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 of 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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to 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 orientation or positional relationship 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 orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to 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 present 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 8230 \ 8230;,"' over 8230;, \8230; upper surface "," above ", etc. may be used herein to describe the spatial 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 terms "at 8230; \8230; 'above" may include both orientations "at 8230; \8230;' above 8230; 'at 8230;' below 8230;" above ". 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 the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
The invention provides a multi-signal characteristic three-coil inductive metal particle detection device, which comprises: the device comprises a three-coil inductive detection chip 5 and a pulse signal post-processing circuit connected with the three-coil inductive metal particle detection chip 5; wherein:
the three-coil inductive detection chip 5 is used for sensing an inductive signal;
the pulse signal post-processing circuit is used for converting an inductive signal induced by the three-coil inductive detection chip 5 into a voltage signal, and simultaneously forming a direct current signal with zero voltage in an undetected circuit, so that the detection precision of metal particles is improved.
In specific implementation, as a preferred embodiment of the present invention, as shown in fig. 1, the three-coil inductive detection chip 5 includes a glass slide 11, a PDMS substrate 12 disposed on the glass slide 11, a micro flow channel 13 embedded in the PDMS substrate 12, and a coil wound on the micro flow channel 13; wherein:
two ends of the micro channel 13 are arranged outside the PDMS substrate 12, one end of the micro channel is used as an oil inlet 14, and the other end of the micro channel is used as an oil outlet 15;
the coil includes two excitation coils (first excitation coil 1 and second excitation coil 3) and detection coil 2, and detection coil 2 sets up between two excitation coils (first excitation coil 1 and second excitation coil 3), and two excitation coils (first excitation coil 1 and second excitation coil 3) reverse coiling, and external voltage is applyed to two excitation coils (first excitation coil 1 and second excitation coil 3), adopts magnetic field to magnetize metal particles, and detection coil 2 is used for changing the interior magnetic field of detection zone. As shown in fig. 2, the detection coil 2 is schematically configured.
In specific implementation, as a preferred embodiment of the present invention, the first excitation coil 1, the second excitation coil 3 and the detection coil 2 are made of high-conductivity copper, the wire is wrapped with an enamel wire and wound into a hollow shape, the heights of the three coils are kept consistent, and the metal particles sequentially pass through the first excitation coil 1, the detection coil 2 and the second excitation coil 3.
In specific implementation, as a preferred embodiment of the present invention, as shown in fig. 3, the pulse signal post-processing circuit includes an excitation module 6, a half-wave rectification module 7, a filter module 8, and an operational amplifier module 9; wherein:
the excitation module 6 is connected with the two excitation coils and used for providing voltage for the two excitation coils for excitation, and an excitation source is an alternating current power supply;
the half-wave rectification module 7 is connected with the excitation module 6 and is used for converting alternating current into pulsating direct current;
the filter module 8 is connected with the detection coil 2 and used for converting an inductive signal induced by the detection coil 2 into a voltage signal and filtering a zero-voltage signal when the circuit is balanced to form a direct-current signal close to zero voltage;
the operational amplifier module 9 is connected to the filter module 8, and is configured to amplify the voltage signal at the signal output end, so that the signal output by the post-processing circuit is a direct current signal with zero voltage, and noise signals during detection of the metal particles 4 are reduced;
in specific implementation, as a preferred embodiment of the present invention, the half-wave rectification module 7 is composed of a resistor and a diode, and is used for half-wave rectifying the alternating current into pulsating direct current.
In specific implementation, as a preferred embodiment of the present invention, the three-coil inductive detection chip 5 is disposed in a hydraulic and lubricating system, and is used for intercepting pulse signals generated when metal particles pass through the three-coil inductive detection chip 5.
In specific implementation, as a preferred embodiment of the present invention, as shown in fig. 4, the pulse signal post-processing circuit is connected to a data acquisition module 10, and is configured to acquire a pulse signal generated by the three-coil inductive detection chip 5 and a high signal-to-noise ratio detection signal obtained by processing the pulse signal by the half-wave rectification module 7, the filter module 8, and the operational amplifier module 9, and display the high signal-to-noise ratio detection signal on an analysis processing device, so as to obtain information on the number, size, and concentration of black metal abrasive particles in the hydraulic and lubricating system. As shown in fig. 5 and 6, the output signal graphs of copper particles and iron particles are shown.
The invention provides a multi-signal characteristic three-coil inductive metal particle detection device, which has the following working principle:
the excitation module 6 is excited by alternating voltage, pulse signals obtained by the three-coil inductive detection chip 5 are subjected to signal processing by the half-wave rectification module 7, the filter module 8 and the operational amplifier module 9 in sequence, and when a circuit is balanced, the signal output after post-processing is approximately zero. Finally, when the metal particles 4 are intercepted by the three-coil inductive detection chip 5 arranged in the hydraulic and lubricating system, the three-coil inductive detection chip 5 generates pulse signals, and the high signal-to-noise ratio detection signals are displayed on the analysis processing device through the data acquisition module 10 after being subjected to half-wave rectification, filtering and operational amplification, so that the information such as the number, the size, the concentration and the like of the black metal abrasive particles in the system is acquired. In the present embodiment, the metal particles 4 are magnetized by the magnetic field generated by the energized first and second exciting coils 1 and 3. The metal particles 4 may be from metal abrasive particles generated by wear in various mechanical devices, which are present in and flow with oil in hydraulic, lubricating systems. By detecting the parameters such as the quantity and the size of the metal particles 4, the wear condition of the mechanical equipment can be judged.
In summary, the output signal of the three-coil inductive detection chip proposed by the present invention is different from that of the conventional three-coil sensor, as shown in fig. 7. The signal output form of the three-coil inductive detection chip provided by the invention is a double-wave-peak double-wave-trough form, so that more characteristic points can be provided for particle size positioning and subsequent function development, and the signal identification is facilitated.
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 these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A multi-signal signature three-coil inductive metal particle detection apparatus, comprising: the device comprises a three-coil inductive detection chip and a pulse signal post-processing circuit connected with the three-coil inductive metal particle detection chip; wherein:
the three-coil inductive detection chip is used for inducing inductive signals, and when the micro coil is used as an exciting coil and an induction coil, the influence of particles on a magnetic field inside the micro coil is relatively enhanced, so that the generated induced electromotive force can generate two wave crests and wave troughs, the characteristic point positions of the signals are increased, and the identification degree of the signals is improved;
the pulse signal post-processing circuit is used for converting an inductive signal induced by the three-coil inductive detection chip into a voltage signal, and simultaneously forming a direct current signal with zero voltage in an undetected circuit, so that the detection precision of metal particles is improved.
2. The multi-signal characteristic three-coil inductive metal particle detection device according to claim 1, wherein the three-coil inductive detection chip comprises a glass slide, a PDMS substrate arranged on the glass slide, a micro-channel embedded in the PDMS substrate, and a coil wound on the micro-channel; wherein:
two ends of the micro channel are arranged outside the PDMS substrate, one end of the micro channel is used as an oil inlet, and the other end of the micro channel is used as an oil outlet;
the coil includes two excitation coils and detection coil, and the detection coil sets up between two excitation coils, and two excitation coil reverse coiling, and external voltage is applyed to two excitation coils, adopts magnetic field to magnetize metal particle, and the detection coil is used for changing the magnetic field in the detection area.
3. The multi-signature three-coil inductive metal particle detection device as claimed in claim 1, wherein the excitation coil and the detection coil are made of highly conductive copper, the wire is wrapped with an enamel wire and wound in a hollow shape, the three coils are kept at a uniform height, and the metal particles pass through the excitation coil, the detection coil and the excitation coil in sequence.
4. The multi-signal-signature three-coil inductive metal particle detection apparatus of claim 1 wherein said pulse signal post-processing circuitry comprises an excitation module, a half-wave rectification module, a filter module, and an operational amplifier module; wherein:
the excitation module is connected with the two excitation coils and used for providing voltage for the two excitation coils for excitation, and an excitation source is an alternating current power supply;
the half-wave rectification module is connected with the excitation module and used for converting alternating current into pulsating direct current;
the filter module is connected with the detection coil and used for converting an inductive signal induced by the detection coil into a voltage signal and filtering a zero-voltage signal when the circuit is balanced to form a direct-current signal close to zero voltage;
and the operational amplifier module is connected with the filter module and is used for amplifying the voltage signal of the output signal end, so that the signal output by the post-processing circuit is a direct current signal with zero voltage.
5. The multi-signal-signature three-coil inductive metal particle detection device as claimed in claim 1, wherein said half-wave rectification module is comprised of a resistor and a diode for half-wave rectifying an alternating current into a pulsating direct current.
6. The multi-signal feature, three-coil inductive metal particle detection apparatus as recited in claim 1, said three-coil inductive detection chip being disposed in a hydraulic, lubricating system for intercepting a pulse signal generated when metal particles pass through the three-coil inductive detection chip.
7. The multi-signal characteristic three-coil inductive metal particle detection device according to claim 1, wherein the pulse signal post-processing circuit is connected to the data acquisition module, and is configured to acquire the pulse signal generated by the three-coil inductive detection chip and the high signal-to-noise ratio detection signal after the pulse signal is processed by the half-wave rectification module, the filter module and the operational amplifier module, and display the high signal-to-noise ratio detection signal on the analysis processing device, so as to obtain the information on the number, size and concentration of black metal abrasive particles in the hydraulic and lubricating system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211414315.1A CN115615883A (en) | 2022-11-11 | 2022-11-11 | Multi-signal-characteristic three-coil inductive metal particle detection device |
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| CN202211414315.1A CN115615883A (en) | 2022-11-11 | 2022-11-11 | Multi-signal-characteristic three-coil inductive metal particle detection device |
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