CN113267540A - Embedded high gradient magnetic field oil multi-pollutant detection device - Google Patents
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- 238000001514 detection method Methods 0.000 title claims abstract description 139
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 42
- 239000003344 environmental pollutant Substances 0.000 title claims abstract description 18
- 230000005284 excitation Effects 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 10
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 7
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 7
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 4
- 230000001939 inductive effect Effects 0.000 claims description 4
- 239000002356 single layer Substances 0.000 claims description 3
- 239000000356 contaminant Substances 0.000 claims description 2
- 238000011109 contamination Methods 0.000 claims description 2
- 239000000758 substrate Substances 0.000 claims description 2
- 235000013870 dimethyl polysiloxane Nutrition 0.000 claims 1
- 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 1
- 238000004987 plasma desorption mass spectroscopy Methods 0.000 claims 1
- 231100000719 pollutant Toxicity 0.000 abstract description 5
- 239000004020 conductor Substances 0.000 abstract description 2
- 230000009977 dual effect Effects 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 23
- 239000003921 oil Substances 0.000 description 20
- 230000005294 ferromagnetic effect Effects 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 239000010720 hydraulic oil Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- -1 bubbles Substances 0.000 description 2
- 230000005307 ferromagnetism Effects 0.000 description 2
- 239000002923 metal particle Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/74—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables of fluids
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The invention provides an embedded high-gradient magnetic field oil multi-pollutant detection device which comprises a detection channel inlet, a detection channel outlet, a detection channel, a detection unit and an excitation-acquisition unit, wherein the detection channel inlet is connected with the detection channel outlet; the detection unit comprises a first plane coil, a second plane coil, a middle high-magnetic-permeability sheet and an outer high-magnetic-permeability sheet; the middle high magnetic conductive sheet is provided with a round hole, the first plane coil and the second plane coil are connected in series and tightly attached and embedded in the round hole of the middle high magnetic conductive sheet, the outer high magnetic conductive sheet is provided with a small hole, the outer high magnetic conductive sheets are arranged at two sides of the middle high magnetic conductive sheet, and the round hole of the middle high magnetic conductive sheet is concentric with the small hole of the outer high magnetic conductive sheet; the excitation-collection unit is connected with the first planar coil and the second planar coil in series through insulated wires. The invention not only uses two plane coils to cling together to carry out an inductance-capacitance dual detection mode to detect the types of pollutants, but also wraps the coils after being connected in series in a high magnetic conductive material to improve the detection precision.
Description
Technical Field
The invention relates to the technical field of fault detection of oil systems, in particular to an embedded high-gradient magnetic field oil multi-pollutant detection device.
Background
In the operation process of a mechanical system, abrasion can inevitably occur, abrasive particles generated by abrasion can enter oil liquid, and in the operation process, pollutants such as bubbles, liquid drops and the like can also be introduced into the oil liquid. The generation and accumulation of contaminants in the oil can affect the operational performance of the mechanical system, which can lead to failure of the mechanical system. Therefore, timely monitoring and analysis of pollutants in oil liquid are of great significance to monitoring the health state of a mechanical system and preventing faults of the mechanical hydraulic system.
The current oil detection technology is divided into off-line detection and on-line detection. The off-line detection is the laboratory oil sample submission, and the detection method has the defects of multiple working procedures, long period and poor timeliness. The on-line detection is mainly classified into an ultrasonic detection method, an optical detection method, an inductance detection method, and a capacitance detection method. The ultrasonic detection method can distinguish metal particles from bubbles, but cannot distinguish the types of solid metal abrasive particles, and is greatly influenced by external temperature, noise and other environmental factors; the optical detection method has high detection precision, but is easily influenced by the definition and permeability of the oil liquid; the inductive detection method can distinguish ferromagnetic particles from non-ferromagnetic particles, but has lower detection sensitivity to the non-ferromagnetic particles; according to the traditional capacitance detection method, water drops and bubbles in oil can be distinguished and detected according to different dielectric constants between polar plates, but metal particles cannot be distinguished and detected.
Disclosure of Invention
According to the technical problem that the detection precision of the existing inductive-reactance type micro-fluidic oil detection chip is limited, the embedded high-gradient magnetic field oil multi-pollutant detection device is provided. The invention not only uses two plane coils to cling together to carry out an inductance-capacitance dual detection mode to detect the types of pollutants, but also wraps the coils after being connected in series in a high magnetic conductive material so as to improve the detection precision.
The technical means adopted by the invention are as follows:
an embedded high gradient magnetic field oil multi-pollutant detection device comprises: the device comprises a detection channel inlet, a detection channel outlet, a detection channel communicated with the detection channel inlet and the detection channel outlet, a detection unit and an excitation-acquisition unit; wherein:
the detection unit comprises a first plane coil, a second plane coil, a middle high-magnetic-permeability sheet and an outer high-magnetic-permeability sheet; the middle high magnetic conductive sheet is provided with a round hole, the first plane coil and the second plane coil are connected in series and tightly attached, and embedded in the round hole of the middle high magnetic conductive sheet, the outer high magnetic conductive sheet is provided with a small hole, the outer high magnetic conductive sheets are arranged at two sides of the middle high magnetic conductive sheet, wherein the round hole of the middle high magnetic conductive sheet is concentric with the small hole of the outer high magnetic conductive sheet;
the excitation-collection unit is connected with the first planar coil and the second planar coil in series through insulated wires.
Further, the detection unit comprises an inductance detection mode and a capacitance detection mode;
in an inductance detection mode, the first planar coil and the second planar coil are connected in series and are connected to the high level and the low level of the excitation-acquisition module through insulated wires;
in the capacitance detection mode, the first planar coil and the second planar coil are respectively connected end to serve as two capacitor plates, and each capacitor plate is connected to the high level and the low level of the excitation-acquisition module through an insulated wire.
Further, the excitation-acquisition unit comprises an inductive excitation acquisition mode and a capacitive excitation acquisition mode;
in an inductance detection mode, an excitation-acquisition unit is set to be 'Ls-Rs' and applies 2V and 1.6MHz excitation;
in the capacitance detection mode, the excitation-collection unit is set to be in a CP-D mode, and 2V and 2MHz high-frequency alternating current excitation is applied.
Further, the inner diameter of the detection channel is 300 microns, and the detection channel penetrates through the inner parts of the first planar coil and the second planar coil of the detection unit.
Further, the detection unit (3) is fixed on the acrylic plate (4).
Furthermore, the detection channel inlet, the detection channel outlet, the detection channel communicating the detection channel inlet and the detection channel outlet, the detection unit and the acrylic plate coated outside the detection unit are all fixed inside the PDMS matrix.
Further, the first planar coil and the second planar coil are arranged in a single layer and are wound by enameled wires, the wire diameter is 70 micrometers, and the number of turns is 10.
Compared with the prior art, the invention has the following advantages:
according to the embedded high-gradient magnetic field oil multi-pollutant detection device, the two planar coils are connected in series to increase the magnetic field of a detection area, so that multiple oil pollutants (ferromagnetism, non-ferromagnetism, bubbles and liquid drops) can be detected by one detection unit, and the coils connected in series are wrapped in the high-permeability magnetic material, so that the magnetic field intensity of the detection unit is increased, the signal-to-noise ratio of ferromagnetic and non-ferromagnetic detection signals is increased, and the detection precision is improved.
Based on the reason, the invention can be widely popularized in the fields of oil system fault 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 schematic view of the structure of the apparatus of the present invention.
FIG. 2 is a schematic view of a detecting unit of the present invention.
Fig. 3 is a waveform diagram of detection of a lower limit of detection of oil contamination according to an embodiment of the present invention.
In the figure: 1. detecting the entrance of the channel; 2. a detection channel; 3. a detection unit; 4. acrylic plates; 5. an outlet of the detection channel; 6. a PDMS matrix; 7. an excitation-collection unit; 8. an outer high magnetic conductive sheet; 9. a middle high magnetic conductive sheet; 10. a first planar coil; 11. a second planar coil.
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 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 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.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated 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 … …" can include both an orientation 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 the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
As shown in fig. 1, the invention provides an embedded high gradient magnetic field oil multi-pollutant detection device, comprising: the device comprises a detection channel inlet 1, a detection channel outlet 5, a detection channel 2 communicated with the detection channel inlet 1 and the detection channel outlet 5, a detection unit 3 and an excitation-acquisition unit 7; wherein:
as shown in fig. 2, the detecting unit 3 includes a first planar coil 10, a second planar coil 11, a middle high-magnetic-permeability sheet 9 and an outer high-magnetic-permeability sheet 8; the middle high magnetic conductive sheet 9 is provided with a round hole, the first plane coil 10 and the second plane coil 11 are connected in series and tightly attached, and embedded in the round hole of the middle high magnetic conductive sheet 9, the outer high magnetic conductive sheet 8 is provided with a small hole, the outer high magnetic conductive sheets 8 are arranged at two sides of the middle high magnetic conductive sheet 9, wherein the round hole of the middle high magnetic conductive sheet 9 is concentric with the small hole of the outer high magnetic conductive sheet 8;
the excitation-collection unit 7 is connected in series with the first planar coil 10 and the second planar coil 11 by insulated wires.
In specific implementation, as a preferred embodiment of the present invention, the detection unit includes an inductance detection mode and a capacitance detection mode;
in an inductance detection mode, the first planar coil 10 and the second planar coil 11 are connected in series and connected to the high and low levels of the excitation-collection module 7 through insulated wires;
in the capacitance detection mode, the first planar coil 10 and the second planar coil 11 are respectively connected end to end as two capacitor plates, and each capacitor plate is connected to the high and low levels of the excitation-collection module 7 through an insulated wire.
In specific implementation, as a preferred embodiment of the present invention, the excitation-collection unit 7 includes an inductive excitation collection mode and a capacitive excitation collection mode;
in the inductance detection mode, the excitation-acquisition unit 7 is set to be 'Ls-Rs' and applies 2V and 1.6MHz excitation;
in the capacitance detection mode, the excitation-collection unit 7 is set to a "CP-D" mode, and high-frequency alternating current excitation of 2V and 2MHz is applied.
Fluid is by during the entrance 1 entering detection device of sense passage, when the water droplet in the fluid, the bubble granule is through detecting element 3, dielectric constant is more pure fluid between first plane coil 10 and the 11 second plane coils changes to some extent, because the dielectric constant of bubble is less than hydraulic oil, and the dielectric constant of water is greater than hydraulic oil, consequently bubble and water droplet will make the electric capacity change that produces not equidirectional between the twin coil to can distinguish the detection to bubble and water droplet in the hydraulic oil. When ferromagnetic particles and non-ferromagnetic particles in oil liquid pass through the detection unit, the inductance of the directions of the ferromagnetic particles and the non-ferromagnetic particles is changed due to different magnetization and eddy effects of the two particles, so that the ferromagnetic particles and the non-ferromagnetic particles in the hydraulic oil can be distinguished and detected.
In practical application, as a preferred embodiment of the present invention, the inner diameter of the detection channel is 300 μm, and the detection channel passes through the inside of the first planar coil 10 and the second planar coil 11 of the detection unit 3. The first planar coil 10 and the second planar coil 11 are arranged as single layers and are wound by enameled wires, the wire diameter is 70 micrometers, and the number of turns is 10.
In a specific embodiment, the detecting unit 3 is fixed on the acrylic plate 4 to fix the detecting unit 3.
In specific implementation, as a preferred embodiment of the present invention, the detection channel inlet 1, the detection channel outlet 5, the detection channel 2 communicating the detection channel inlet 1 and the detection channel outlet 5, the detection unit 3, and the acrylic plate 4 coated outside the detection unit are all fixed inside the PDMS matrix 6. The PDMS substrate 6 is made of a PDMS (polydimethylsiloxane) material by a molding method.
In order to verify the effectiveness of the device, the experimental verification shows the comparison result of the detection signal-to-noise ratio of the iron particles and the copper particles under different structures, which is shown in the following table 1:
TABLE 1 SNR for detection of iron and copper particles under different structures
As is apparent from Table 1, the signal-to-noise ratio of the detection can be obviously improved by the present invention, and in addition, in the experiment, the device can detect iron particles with the particle size of 10-15 μm, copper particles with the particle size of 60-70 μm, water drops with the particle size of 70-80 μm and air bubbles with the particle size of 190-200 μm. The detection signal diagram is shown in FIG. 3, (a) is a 10-15 μm iron particle detection signal diagram, (b) is a 60-70 μm copper particle detection signal diagram, (c) is a 70-80 μm water droplet detection signal diagram, and (d) is a 190-200 μm bubble detection signal diagram.
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 (7)
1. The utility model provides an embedded high gradient magnetic field fluid multi-contaminant detection device which characterized in that includes: the device comprises a detection channel inlet (1), a detection channel outlet (5), a detection channel (2) communicated with the detection channel inlet (1) and the detection channel outlet (5), a detection unit (3) and an excitation-collection unit (7); wherein:
the detection unit (3) comprises a first plane coil (10), a second plane coil (11), a middle high-permeability sheet (9) and an outer high-permeability sheet (8); a round hole is formed in the middle high-magnetic-conductivity sheet (9), the first plane coil (10) and the second plane coil (11) are connected in series and tightly attached, and are embedded in the round hole of the middle high-magnetic-conductivity sheet (9), a small hole is formed in the outer high-magnetic-conductivity sheet (8), the outer high-magnetic-conductivity sheets (8) are arranged on two sides of the middle high-magnetic-conductivity sheet (9), wherein the round hole of the middle high-magnetic-conductivity sheet (9) is concentric with the small hole of the outer high-magnetic-conductivity sheet (8);
the excitation-collection unit (7) is connected in series with the first planar coil (10) and the second planar coil (11) through insulated wires.
2. The in-line high gradient magnetic field oil multi-pollutant detection device according to claim 1, wherein the detection unit comprises an inductance detection mode and a capacitance detection mode;
in an inductance detection mode, a first planar coil (10) and a second planar coil (11) are connected in series and are connected to the high and low levels of an excitation-collection module (7) through insulated wires;
in a capacitance detection mode, the first planar coil (10) and the second planar coil (11) are respectively connected end to serve as two capacitor plates, and each capacitor plate is connected to the high level and the low level of the excitation-collection module (7) through an insulated wire.
3. The in-line high gradient magnetic field oil multi-pollutant detection device according to claim 1, wherein the excitation-collection unit (7) comprises an inductive excitation collection mode and a capacitive excitation collection mode;
in an inductance detection mode, an excitation-acquisition unit (7) is set to be 'Ls-Rs' and applies 2V and 1.6MHz excitation;
in the capacitance detection mode, the excitation-collection unit (7) is set to be in a 'CP-D' mode, and 2V and 2MHz high-frequency alternating current excitation is applied.
4. The in-line high gradient magnetic field oil contamination detection device according to claim 1, wherein the inner diameter of the detection channel is 300 μm and passes through the inside of the first planar coil (10) and the second planar coil (11) of the detection unit (3).
5. The embedded high gradient magnetic field oil liquid multi-pollutant detection device according to claim 1, wherein the detection unit (3) is fixed on an acrylic plate (4).
6. The embedded high gradient magnetic field oil-liquid multi-pollutant detection device according to claim 3, wherein the detection channel inlet (1), the detection channel outlet (5), the detection channel (2) communicating the detection channel inlet (1) and the detection channel outlet (5), the detection unit (3) and the acrylic plate (4) coated outside the detection unit are fixed inside the PDMS substrate (6).
7. The embedded high gradient magnetic field oil liquid multi-pollutant detection device according to claim 1, wherein the first planar coil (10) and the second planar coil (11) are arranged in a single layer and are wound by enameled wires, the wire diameter is 70 micrometers, and the number of turns is 10.
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