CN113899808B - Eddy current probe and manufacturing method thereof - Google Patents
Eddy current probe and manufacturing method thereof Download PDFInfo
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- CN113899808B CN113899808B CN202110962215.1A CN202110962215A CN113899808B CN 113899808 B CN113899808 B CN 113899808B CN 202110962215 A CN202110962215 A CN 202110962215A CN 113899808 B CN113899808 B CN 113899808B
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- 239000000523 sample Substances 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 98
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 44
- 239000010935 stainless steel Substances 0.000 claims abstract description 44
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 21
- 239000010959 steel Substances 0.000 claims abstract description 21
- 239000004020 conductor Substances 0.000 claims abstract description 17
- 238000003466 welding Methods 0.000 claims abstract description 9
- 238000004806 packaging method and process Methods 0.000 claims description 31
- 238000007789 sealing Methods 0.000 claims description 25
- 238000001746 injection moulding Methods 0.000 claims description 20
- 230000035945 sensitivity Effects 0.000 claims description 10
- 239000004734 Polyphenylene sulfide Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 229920000069 polyphenylene sulfide Polymers 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 230000003068 static effect Effects 0.000 claims description 3
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 3
- 238000005538 encapsulation Methods 0.000 abstract 4
- 238000005253 cladding Methods 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 229920006335 epoxy glue Polymers 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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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
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9006—Details, e.g. in the structure or functioning of sensors
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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
An eddy current probe and a manufacturing method thereof, comprising a cable and an outer sleeve piece, wherein the end part of the cable is respectively provided with a first copper ring, a second copper ring and a third copper ring; the copper ring surface cladding has the encapsulation casing, and first wire casing and second wire casing of crossing have been seted up respectively to encapsulation casing surface, and encapsulation casing tip is provided with the coil mount pad, and coil mount pad external surface fixed wrap-around has the coil, and encapsulation casing surface is provided with spacing arch, has cup jointed the thread bush between spacing arch and the coil mount pad, and the thread bush surface has the stainless steel casing through threaded connection, and stainless steel casing external surface is connected with the inner chamber of shell body. The invention overcomes the defects of the prior art, takes the first copper ring and the second copper ring as media to ensure that the copper rings are reliably connected with the cable inner conductor core wire and the inner shielding layer, and performs circumferential laser welding on the unthreaded part of the steel ring edge and the front section of the stainless steel shell to form an integral structure, thereby ensuring the long-time working stability, reliability and safety of the vortex sensor.
Description
Technical Field
The invention relates to the technical field of eddy current probes, in particular to an electric eddy current probe and a manufacturing method thereof.
Background
The most typical application of the 25mm diameter eddy current probe is on a large turbine, and is used for monitoring thermal expansion or cooling shrinkage of a cylinder and a rotor when the turbine starts to be heated or stops to be operated and cooled and when load changes occur. Because the heated area of the rotor is larger than that of the cylinder, the mass of the rotor is smaller than that of the corresponding cylinder, and the heat release coefficient of steam on the surface of the rotor is larger, under the same condition, the temperature change of the rotor is faster than that of the cylinder, an expansion difference exists between the rotor and the cylinder, and the difference is that the rotor is relative to the cylinder, a current vortex sensor probe with the diameter of 25mm is usually fixed on the inner side of the cylinder by a firm bracket, and the probe is used for non-contact monitoring of the displacement change generated by a rotor disc.
At present, the traditional manufacturing of the eddy current probe is to bond the shaped coil and the common plastic framework body together by glue, fix the coil end on the cable, and have larger assembly gap and low dimensional accuracy. When the probe is used in a working temperature environment and a vibration environment with the temperature of more than 100 ℃ for a long time, the coil is easy to shift and loose, and the probe is unstable and unreliable in work. And the two ends of the probe coil lead are connected with the inner conductor and the inner shielding layer of the coaxial cable by adopting tin wire welding, and when the product manufactured by the probe coil connecting method is used in a higher temperature environment for a long time, the tin welding point is easy to oxidize and desolder, so that the probe is damaged. After the coil and the coil supporting framework are arranged in the protective cover, a gap of only 0.15-0.2 mm is reserved between the inner wall of the protective cover and the outer edges of the coil and the coil supporting framework, epoxy glue which can be permeated into the protective cover is little, and when the protective cover works in a high temperature and vibration environment for a long time, the inner wall around the protective cover can be separated from the epoxy glue which is thin Bao Niange, so that the coil is shifted and loosened. And because there is not any locking connection structure between stainless steel shell inner wall and front end, coil supporting framework that bonds with coil, only fill them fixedly through epoxy glue, when the product works in higher temperature, greasy dirt and vibratory environment for a long time, stainless steel shell inner wall can separate with epoxy glue, leads to the probe head body to take place to shift, become flexible, causes the probe to work unstable, unreliable.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the electric vortex probe and the manufacturing method thereof, which overcome the defects of the prior art, are reasonable in design, take the first copper ring and the second copper ring as media, enable the inner conductor core wire and the inner shielding layer of the cable to be in contact with the copper ring in a large area, ensure that the copper ring can be reliably connected with the inner conductor core wire and the inner shielding layer of the cable, and carry out circumferential laser welding on the unthreaded part of the front section of the stainless steel shell through the edge of the steel ring to form an integral structure, thereby ensuring the long-time working stability, reliability and safety of the vortex sensor.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
the invention discloses an eddy current probe, which comprises a cable and an outer sleeve piece, wherein a first copper ring, a second copper ring and a third copper ring are respectively arranged at the end part of the cable, and are respectively and fixedly connected with the outer surface of an inner conductor core wire, the outer surface of an inner shielding layer and the outer surface of an outer shielding layer of the cable; the outer surfaces of the first copper ring, the second copper ring and the third copper ring are coated with packaging shells, the surfaces of the packaging shells are respectively provided with a first wire passing groove and a second wire passing groove, the first wire passing groove and the second wire passing groove respectively correspond to the outer surfaces of the first copper ring and the second copper ring, the end part of the packaging shells is provided with a coil mounting seat, coils are fixedly wound on the outer surfaces of the coil mounting seat, and leads at two ends of the coils respectively penetrate through the first wire passing groove and the second wire passing groove to be connected with the first copper ring and the second copper ring;
the outer surface of the packaging shell is provided with a limit bulge, a thread sleeve is fixedly sleeved between the limit bulge and the coil mounting seat, the first thread passing groove and the second thread passing groove are both positioned in the thread sleeve, the outer surface of the thread sleeve is connected with an internal thread of the stainless steel shell through threads, and the outer surface of the stainless steel shell is connected with an inner cavity of the outer shell through external threads;
the outer sleeve member is sleeved on the outer surface of the coil mounting seat, and the end part of the outer sleeve member is fixedly connected with the outer shell body through a steel ring.
Preferably, the thread sleeve is coated on the outer surface of the packaging shell by adopting a high-temperature full-sealing injection molding process.
Preferably, the external thread of the thread bush is set to be a 10-degree taper structure, the internal thread of the stainless steel shell is set to be a 10-degree taper internal thread, and the internal thread of the stainless steel shell is matched with the external thread of the thread bush to be locked and fixed.
Preferably, the stainless steel shell body outer surface has seted up the annular groove, the annular groove is inside to be provided with two round holes that become 180 degrees each other, install the locking nail in the round hole, the locking nail passes the round hole and locks mutually with the thread bush.
Preferably, two wire passing holes are formed in the coil mounting seat, and leads at two ends of the coil respectively penetrate through the two wire passing holes and then are connected with the first copper ring and the second copper ring through the first wire passing groove and the second wire passing groove.
Preferably, a positioning groove is formed in the inner cavity side surface of the outer sleeve member, and the outer sleeve member is connected with the coil mounting seat through the positioning groove.
Preferably, two groups of annular grooves are respectively formed in the outer surface of the steel ring, annular connecting protrusions are respectively arranged on the inner side surface of the outer sleeve piece and the inner surface of the end part of the outer shell, and the annular connecting protrusions are respectively welded in the two groups of annular grooves through laser.
Preferably, the stainless steel shell is provided with a sealing groove on the outer surface, a sealing ring is fixedly arranged in the sealing groove, and the stainless steel shell is in sealing contact with the inner surface of the external member through the sealing ring.
The invention also discloses a manufacturing method of the eddy current probe, which comprises the following steps:
step S1: adjusting the diameter of an inner ring hole, the diameter of an outer ring, the number of turns of the coil, the thickness of the coil, the direct current resistance, the inductance, the loss and the quality factor of the coil according to requirements;
step S2: respectively crimping the first copper ring, the second copper ring and the third copper ring on the outer surface of the inner conductor core wire, the outer surface of the inner shielding layer and the outer surface of the outer shielding layer of the cable;
step S3: putting the cable conductor with the copper ring and the polyphenylene sulfide particle material prepared in the step S2 into a customized plastic mold, so that the polyphenylene sulfide particle material is injection molded into an integrated structure of the packaging shell and the coil mounting seat, and the packaging shell is coated on the outer surface of the cable;
step S4: placing the coil debugged in the step S1 on a coil mounting seat plane formed by injection molding in the step S3, and connecting two ends of a coil lead with a first copper ring and a second copper ring through a first wire passing groove and a second wire passing groove formed by injection molding on the surface of a packaging shell in a spot welding manner;
step S5: putting the parts formed in the step S4 together into an injection mold of the thread bush, so that the thread bush formed by injection molding is tightly covered on the outer surface of the packaging shell;
step S6: putting the part formed in the step S5 and the steel ring into a die of an outer sleeve together for injection molding to form an outer sleeve structure, and enabling the outer sleeve and one end of the steel ring to be in an integral structure through injection molding;
step S7: screwing the external thread part of the thread sleeve into the internal thread of the stainless steel shell to adjust the sensitivity, and testing the screwing depth by a special static displacement calibration instrument until the output sensitivity of the sensor reaches 0.787V/mm;
step S8: after the sensitivity is adjusted, namely after the position of the internal thread of the threaded sleeve screwed into the stainless steel shell is determined, the overlapping contact position of the outer ring of the steel ring and the outer shell is welded with laser in a seamless and precise mode along the circumference to form an integral structure.
The invention provides an eddy current probe and a manufacturing method thereof. The beneficial effects are as follows: the first copper ring, the second copper ring and the third copper ring are respectively and fixedly connected to the outer surface of an inner conductor core wire of the cable, the outer surface of an inner shielding layer and the outer surface of an outer shielding layer; the first copper ring and the second copper ring are used as media, so that the cable inner conductor core wire and the inner layer shielding layer can be in large-area contact with the copper ring, and the packaging shell is coated on the outer surface of the copper ring, so that the copper ring, the cable inner conductor core wire and the inner layer shielding layer can be reliably connected, the connection can be guaranteed to be difficult to oxidize and fall off in a high-temperature environment, and reliable connection transmission signals can be effectively guaranteed. The internal thread of the stainless steel shell is in taper sealing connection with the external thread of the thread sleeve, and the stainless steel shell is not in smooth connection in a free state, so that oil stains can be prevented from penetrating from the tail, the fixing of the probe coil can be further ensured to be not shifted, loosened and oxidized, and the stability and reliability of long-time work of the probe can be effectively ensured. And the steel ring edge and the unthreaded part of the front section of the stainless steel shell are subjected to circumferential laser welding to form an integral structure, so that the long-time working stability, reliability and safety of the vortex sensor are ensured.
Drawings
In order to more clearly illustrate the invention or the technical solutions in the prior art, the drawings used in the description of the prior art will be briefly described below.
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of the cable of the present invention connected to a first copper ring, a second copper ring, and a third copper ring;
FIG. 3 is a schematic view of the mounting structure of the package housing and coil mount of the present invention;
FIG. 4 is a schematic view of the installation structure of the thread bush of the present invention;
FIG. 5 is a schematic cross-sectional view of a stainless steel housing according to the present invention;
FIG. 6 is a schematic cross-sectional view of a steel ring according to the present invention;
FIG. 7 is a schematic view of the mounting structure of the outer housing of the present invention;
the reference numerals in the figures illustrate:
1. a cable; 2. a first copper ring; 3. a second copper ring; 4. a third copper ring; 5. packaging the shell; 6. a first wire passing groove; 7. a second wire passing groove; 8. a coil mounting base; 9. a coil; 10. an outer sleeve; 11. a limit protrusion; 12. a thread sleeve; 13. a stainless steel housing; 14. an outer housing; 15. a steel ring; 16. an annular groove; 18. an annular groove; 19. sealing grooves; 20. and (3) sealing rings.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings.
1-7, the invention discloses an eddy current probe, which comprises a cable 1 and a jacket piece 10, wherein a first copper ring 2, a second copper ring 3 and a third copper ring 4 are respectively arranged at the end part of the cable 1, and the first copper ring 2, the second copper ring 3 and the third copper ring 4 are respectively fixedly connected to the outer surface of an inner conductor core wire, the outer surface of an inner shielding layer and the outer surface of an outer shielding layer of the cable 1; the outer surfaces of the first copper ring 2, the second copper ring 3 and the third copper ring 4 are coated with a packaging shell 5, a first wire passing groove 6 and a second wire passing groove 7 are respectively formed in the surface of the packaging shell 5, the first wire passing groove 6 and the second wire passing groove 7 correspond to the outer surfaces of the first copper ring 2 and the second copper ring 3 respectively, a coil mounting seat 8 is arranged at the end part of the packaging shell 5, a coil 9 is fixedly wound on the outer surface of the coil mounting seat 8, and leads at two ends of the coil 9 respectively penetrate through the first wire passing groove 6 and the second wire passing groove 7 and are connected with the first copper ring 2 and the second copper ring 3; in this embodiment, two wire passing holes are formed in the coil mounting seat 8, and two end leads of the coil 9 respectively pass through the two wire passing holes and then are connected with the first copper ring 2 and the second copper ring 3 through the first wire passing groove 6 and the second wire passing groove 7.
The outer surface of the packaging shell 5 is provided with a limiting protrusion 11, a thread sleeve 12 is fixedly sleeved between the limiting protrusion 11 and the coil mounting seat 8, the first thread passing groove 6 and the second thread passing groove 7 are both positioned in the thread sleeve 12, the outer surface of the thread sleeve 12 is connected with an internal thread of a stainless steel shell 13 through threads, and the outer surface of the stainless steel shell 13 is connected with an inner cavity of an outer shell 14 through external threads;
the inner cavity side surface of the outer sleeve 10 is provided with a positioning groove, and the outer sleeve 10 is connected with the coil mounting seat 8 through the positioning groove; the end of the outer sleeve 10 is fixedly connected to the outer housing 14 by a steel ring 15.
Working principle:
the first copper ring 2, the second copper ring 3 and the third copper ring 4 are respectively and fixedly connected to the outer surface of an inner conductor core wire, the outer surface of an inner shielding layer and the outer surface of an outer shielding layer of the cable 1; the first copper ring 2 and the second copper ring 3 are used as media, so that an inner conductor core wire and an inner shielding layer of the cable 1 can be in large-area contact with the copper ring, and the outer surface of the copper ring is coated with the packaging shell 5, so that the copper ring, the inner conductor core wire and the inner shielding layer of the cable can be reliably connected, the connection is not easy to oxidize and fall off in a high-temperature environment, reliable connection transmission signals can be effectively ensured, two ends of a coil 9 lead are respectively welded on the first copper ring 2 and the second copper ring 3 by adopting laser spot welding, the outer surface of the copper ring is coated with the threaded sleeve 12 for fixing and positioning, and in the embodiment, the threaded sleeve 12 is coated on the outer surface of the packaging shell 5 by adopting a high-temperature full-sealing injection molding process; thereby further ensuring the reliable connection between the two ends of the coil lead and the coaxial cable. The working stability, reliability and safety performance of the traditional eddy current sensor probe are effectively ensured; the temperature drift performance of the sensor probe is greatly reduced; because of the full-sealing non-oxidation forming, the service life of the probe can be prolonged to more than 10 years from three years of the traditional production process.
In the second embodiment, as a further improvement of the first embodiment, the external thread of the threaded sleeve 12 is set to be a 10 ° taper structure, the internal thread of the stainless steel housing 13 is set to be a 10 ° taper internal thread, and the internal thread of the stainless steel housing 13 is matched with the external thread of the threaded sleeve 12 to be locked and fixed. The internal thread of the stainless steel shell 13 and the external thread of the thread sleeve 12 are in taper sealing connection, but not in smooth connection in a free state, so that oil stains can be prevented from penetrating from the tail, the fixation of a probe coil can be further ensured to be not shifted, loosened and oxidized, and the stability and reliability of long-time work of the probe can be effectively ensured.
In the third embodiment, as a further improvement of the second embodiment, an annular groove 16 is formed in the outer surface of the stainless steel shell 13, two circular holes which are 180 degrees apart from each other are formed in the annular groove 16, locking nails are installed in the circular holes, and the locking nails penetrate through the circular holes to be locked with the threaded sleeve 12. The stainless steel shell 13 and the threaded sleeve 12 are further tightly locked and connected into a whole through the locking nails.
In the fourth embodiment, as a further improvement of the second embodiment, two groups of annular grooves 18 are respectively formed on the outer surface of the steel ring 15, annular connecting protrusions are respectively formed on the inner side surface of the outer sleeve member 10 and the inner surface of the end portion of the outer shell 14, and the annular connecting protrusions are respectively welded in the two groups of annular grooves 18 through laser. The annular groove 18 increases the contact area of the steel ring 15 with the jacket element 10 and the outer housing 14, so that the stability of the connection between the jacket element 10 and the outer housing 14 is further ensured.
In the fifth embodiment, as a further improvement of the second embodiment, a sealing groove 19 is formed on the outer surface of the stainless steel shell 13, a sealing ring 20 is fixedly installed in the sealing groove 19, and the stainless steel shell 13 is in sealing contact with the inner surface of the jacket member 10 through the sealing ring 20. The sealing effect inside the external member 10 is ensured by the sealing ring 20.
The invention also discloses a manufacturing method of the eddy current probe, which comprises the following steps:
step S1: adjusting the diameter of an inner ring hole, the diameter of an outer ring, the number of turns of the coil, the thickness of the coil, the direct current resistance, the inductance, the loss and the quality factor of the coil 9 according to requirements;
step S2: the first copper ring 2, the second copper ring 3 and the third copper ring 4 are respectively pressed and connected to the outer surface of the inner conductor core wire, the outer surface of the inner shielding layer and the outer surface of the outer shielding layer of the cable 1;
step S3: then placing the cable with copper ring and the polyphenylene sulfide particle material prepared in the step S2 into a customized plastic mold, so that the polyphenylene sulfide particle material is injection molded into an integrated structure of the packaging shell 5 and the coil mounting seat 8, and the packaging shell 5 is coated on the outer surface of the cable 1; therefore, the fixed positioning of the probe coil can be realized without moving or loosening, and the stability and the reliability of signal transmission can be ensured;
step S4: placing the coil 9 debugged in the step S1 on the plane of a coil mounting seat 8 formed by injection molding in the step S3, and connecting two ends of a lead wire of the coil 9 with the first copper ring 2 and the second copper ring 3 through spot welding of a first wire passing groove 6 and a second wire passing groove 7 formed by injection molding on the surface of the packaging shell 5;
step S5: putting the parts formed in the step S4 together into an injection mold of the thread bush 12, so that the thread bush 12 formed by injection molding is tightly covered on the outer surface of the packaging shell 5; the coil core structural block and the cable structural body can be tightly and firmly fixed together, and the polyphenylene sulfide material also reliably fixes the 3 copper rings and the cable together through injection molding. The thread structure is formed on the injection molding structure body and is used for precisely adjusting the sensitivity when the rear surface is in threaded connection with the inner part of the stainless steel shell;
step S6: putting the part formed in the step S5 and the steel ring 15 into a die of the outer sleeve 10 together for injection molding to form a structure of the outer sleeve 10, and enabling the outer sleeve 10 and one end of the steel ring 15 to be in an integral structure through injection molding; the connection with the stainless steel shell of the probe is facilitated;
step S7: the external thread part of the thread sleeve 12 is screwed into the internal thread of the stainless steel shell 13 to adjust the sensitivity, and the screwed depth is tested by a special static displacement calibration instrument until the output sensitivity of the sensor reaches 0.787V/mm;
step S8: after the sensitivity is adjusted, namely, after the position of the internal thread of the threaded sleeve 12 screwed into the stainless steel shell 13 is determined, the overlapping contact position of the outer ring of the steel ring 15 and the outer shell 14 is welded in a laser seamless precision mode along the circumference to form an integral structure.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. An eddy current probe, characterized in that: the cable comprises a cable (1) and an outer sleeve (10), wherein a first copper ring (2), a second copper ring (3) and a third copper ring (4) are respectively arranged at the end part of the cable (1), and the first copper ring (2), the second copper ring (3) and the third copper ring (4) are respectively and fixedly connected to the outer surface of an inner conductor core wire, the outer surface of an inner shielding layer and the outer surface of an outer shielding layer of the cable (1); the novel copper wire packaging structure is characterized in that the outer surfaces of the first copper ring (2), the second copper ring (3) and the third copper ring (4) are coated with a packaging shell (5), a first wire passing groove (6) and a second wire passing groove (7) are respectively formed in the surface of the packaging shell (5), the first wire passing groove (6) and the second wire passing groove (7) correspond to the outer surfaces of the first copper ring (2) and the second copper ring (3) respectively, a coil mounting seat (8) is arranged at the end part of the packaging shell (5), a coil (9) is fixedly wound on the outer surface of the coil mounting seat (8), and leads at two ends of the coil (9) penetrate through the first wire passing groove (6) and the second wire passing groove (7) respectively and are connected with the first copper ring (2) and the second copper ring (3);
the outer surface of the packaging shell (5) is provided with a limit bulge (11), a thread sleeve (12) is fixedly sleeved between the limit bulge (11) and the coil mounting seat (8), the first thread passing groove (6) and the second thread passing groove (7) are both positioned in the thread sleeve (12), the outer surface of the thread sleeve (12) is connected with the inner thread of the stainless steel shell (13) through threads, and the outer surface of the stainless steel shell (13) is connected with the inner cavity of the outer shell (14) through external threads;
the outer sleeve (10) is sleeved on the outer surface of the coil mounting seat (8), and the end part of the outer sleeve (10) is fixedly connected with the outer shell (14) through a steel ring (15);
the external thread of the thread sleeve (12) is of a 10-degree taper structure, the internal thread of the stainless steel shell (13) is of a 10-degree taper internal thread, and the internal thread of the stainless steel shell (13) is matched with the external thread of the thread sleeve (12) to be locked and fixed;
two groups of annular grooves (18) are respectively formed in the outer surface of the steel ring (15), annular connecting protrusions are respectively formed in the inner side surface of the outer sleeve member (10) and the inner surface of the end part of the outer shell body (14), and the annular connecting protrusions are respectively welded in the two groups of annular grooves (18) through laser.
2. An eddy current probe as claimed in claim 1, wherein: the thread sleeve (12) is coated on the outer surface of the packaging shell (5) by adopting a high-temperature full-sealing injection molding process.
3. An eddy current probe as claimed in claim 1, wherein: the stainless steel shell (13) is characterized in that an annular groove (16) is formed in the outer surface of the stainless steel shell, two round holes which are 180 degrees apart from each other are formed in the annular groove (16), locking nails are arranged in the round holes, and the locking nails penetrate through the round holes to be locked with the threaded sleeve (12).
4. An eddy current probe as claimed in claim 1, wherein: two wire passing holes are formed in the coil mounting seat (8), and two end leads of the coil (9) respectively penetrate through the two wire passing holes and then are connected with the first copper ring (2) and the second copper ring (3) through the first wire passing groove (6) and the second wire passing groove (7).
5. An eddy current probe as claimed in claim 1, wherein: the inner cavity side surface of the outer sleeve (10) is provided with a positioning groove, and the outer sleeve (10) is connected with the coil mounting seat (8) through the positioning groove.
6. An eddy current probe as claimed in claim 1, wherein: the stainless steel shell (13) is characterized in that a sealing groove (19) is formed in the outer surface of the stainless steel shell (13), a sealing ring (20) is fixedly installed in the sealing groove (19), and the stainless steel shell (13) is in sealing contact with the inner surface of the outer sleeve member (10) through the sealing ring (20).
7. A method of manufacturing an eddy current probe according to any one of claims 1 to 6, wherein: the method comprises the following steps:
step S1: adjusting the diameter of an inner ring hole, the diameter of an outer ring, the number of turns of the coil, the thickness of the coil, the direct current resistance, the inductance, the loss and the quality factor of the coil (9) according to requirements;
step S2: the first copper ring (2), the second copper ring (3) and the third copper ring (4) are respectively pressed and connected to the outer surface of the inner conductor core wire, the outer surface of the inner shielding layer and the outer surface of the outer shielding layer of the cable (1);
step S3: placing the cable with the copper ring and the polyphenylene sulfide particle material prepared in the step S2 into a customized plastic mold, and enabling the polyphenylene sulfide particle material to be injection molded into an integrated structure of the packaging shell (5) and the coil mounting seat (8), so that the packaging shell (5) is coated on the outer surface of the cable (1);
step S4: placing the coil (9) debugged in the step S1 on the plane of a coil mounting seat (8) formed by injection molding in the step S3, and connecting the two ends of a lead wire of the coil (9) with a first copper ring (2) and a second copper ring (3) through spot welding of a first wire passing groove (6) and a second wire passing groove (7) formed by injection molding on the surface of a packaging shell (5);
step S5: putting the parts formed in the step S4 into an injection mold of the thread bush (12) together, so that the thread bush (12) formed by injection molding is tightly covered on the outer surface of the packaging shell (5);
step S6: placing the part formed in the step S5 and the steel ring (15) into a die of the outer sleeve (10) together for injection molding to form a structure of the outer sleeve (10), and enabling the outer sleeve (10) and one end of the steel ring (15) to be in an integral structure through injection molding;
step S7: the external thread part of the thread sleeve (12) is screwed into the internal thread of the stainless steel shell (13) to adjust the sensitivity, and the screwed depth is tested by a special static displacement calibration instrument until the output sensitivity of the sensor reaches 0.787V/mm;
step S8: after the sensitivity is adjusted, namely, after the position of the internal thread of the screw sleeve (12) screwed into the stainless steel shell (13) is determined, the overlapping contact position of the outer ring of the steel ring (15) and the outer shell (14) is welded in a laser seamless and precise way along the circumference to form an integral structure.
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| CN203216503U (en) * | 2013-04-28 | 2013-09-25 | 中国工程物理研究院总体工程研究所 | Electric eddy current sensor probe with water pressure resistant front end |
| CN103884268A (en) * | 2014-03-31 | 2014-06-25 | 中国工程物理研究院总体工程研究所 | Full-waterproof eddy current sensor probe |
| CN103900617A (en) * | 2014-04-14 | 2014-07-02 | 上海瑞视仪表电子有限公司 | Method for manufacturing electrical vortex sensor probe |
| CN109060071A (en) * | 2018-09-26 | 2018-12-21 | 贵州宇光鸿宇电气照明科技有限公司 | A kind of aluminum oxide ceramic electric contact structure |
| CN109990806A (en) * | 2019-04-02 | 2019-07-09 | 上海瑞视仪表电子有限公司 | A kind of manufacturing process of current vortex sensor |
| CN110823436A (en) * | 2019-10-08 | 2020-02-21 | 珠海格力电器股份有限公司 | Six-dimensional force detection method based on eddy current effect, sensor and intelligent equipment |
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| CN203216503U (en) * | 2013-04-28 | 2013-09-25 | 中国工程物理研究院总体工程研究所 | Electric eddy current sensor probe with water pressure resistant front end |
| CN103884268A (en) * | 2014-03-31 | 2014-06-25 | 中国工程物理研究院总体工程研究所 | Full-waterproof eddy current sensor probe |
| CN103900617A (en) * | 2014-04-14 | 2014-07-02 | 上海瑞视仪表电子有限公司 | Method for manufacturing electrical vortex sensor probe |
| CN109060071A (en) * | 2018-09-26 | 2018-12-21 | 贵州宇光鸿宇电气照明科技有限公司 | A kind of aluminum oxide ceramic electric contact structure |
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| CN113899808A (en) | 2022-01-07 |
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