CN209992435U - Differential eddy current testing probe with large lift-off distance - Google Patents
Differential eddy current testing probe with large lift-off distance Download PDFInfo
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- CN209992435U CN209992435U CN201920720189.XU CN201920720189U CN209992435U CN 209992435 U CN209992435 U CN 209992435U CN 201920720189 U CN201920720189 U CN 201920720189U CN 209992435 U CN209992435 U CN 209992435U
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- eddy current
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Abstract
The utility model discloses a carry greatly from differential eddy current test probe of distance relates to nondestructive test technical field, and it includes support frame, detection coil, exciting coil, and detection coil is provided with two and fixed mounting on the support frame, and two detection coils are differential connection and along interval distribution on the horizontal direction, and two detection coils are located to the exciting coil synchronous cover and circle. The utility model discloses thereby enlarged the working distance scope between probe response face and the measured object to increase the applicable working range of probe.
Description
Technical Field
The utility model belongs to the technical field of nondestructive testing technique and specifically relates to a carry greatly from differential eddy current test probe of distance.
Background
The nondestructive testing is a method for inspecting and testing the structure, the property, the state and the type, the property, the quantity, the shape, the position, the size, the distribution and the change of the defects inside and on the surface of a test piece by taking a physical or chemical method as a means and by means of modern technology and equipment and by utilizing the change of the reaction of heat, sound, light, electricity, magnetism and the like caused by the abnormal structure or the existence of the defects of a material on the premise of not damaging or not influencing the service performance of the tested object and not damaging the internal tissue of the tested object.
In the traditional nondestructive testing method, the eddy current testing technology is suitable for detecting defects on the surface and near surface of a conductive material, an eddy current testing probe is used as an eddy current signal detection sensor, but the distance range between the traditional eddy current testing probe and a tested object is generally smaller than 1.5mm, namely the change range of the lifting distance between the sensing surface of the probe and the tested object is small, and meanwhile, the control technology requirement on the testing technology is high, so that the application range of eddy current testing work is small.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a carry greatly apart from differential eddy current test probe of distance has increased the sensing distance of probe to increased the distance scope between probe response face and the measured object, with the applicable working range of increase eddy current probe.
The utility model aims at realizing through the following technical scheme:
the utility model provides a big differential eddy current test probe who lifts from distance, includes support frame, detection coil, exciting coil, and the detection coil is provided with two and fixed mounting on the support frame, and two detection coils are differential connection and along the interval distribution in the horizontal direction, and exciting coil synchronous cover is located two detection coils.
By adopting the technical scheme, the two detection coils are arranged and are uniformly distributed along the horizontal direction, and the excitation coils are synchronously sleeved on the two coils, so that the sensing distance of the detection probe can reach about 5mm, the sensing distance of the probe is increased, and the artificial defect with a certain size can be detected in the probe lifting range smaller than 5 mm.
The utility model discloses further set up to: the support frame is arranged in the metal shell through the connecting piece.
By adopting the technical scheme, the metal shell is arranged, when the support frame is arranged in the metal shell through the connecting piece, the detection coil and the excitation coil are both positioned in the metal shell, so that the detection coil and the excitation coil are shielded, and the interference of the environment to the probe is reduced.
The utility model discloses further set up to: the wear-resisting plate is fixed on the metal shell and seals an opening at one end of the metal shell.
Adopt above-mentioned technical scheme, through setting up insulating antifriction plate, make eddy current signal can spread into the probe inside, avoid the work piece to the wearing and tearing of probe terminal surface simultaneously, played the guard action to detecting coil, exciting coil, extension probe life.
The utility model discloses further set up to: the distance between the surface of the insulating wear-resisting plate facing the interior of the metal shell and the detection coil is less than 0.2 mm.
Adopt above-mentioned technical scheme, detection coil is close to the setting of insulating antifriction plate to be favorable to the inside lift distance of control probe, reinforcing detection effect.
The utility model discloses further set up to: the exciting coil is arranged close to the insulating wear-resisting plate, and the corresponding distance between the surface of the insulating wear-resisting plate facing the interior of the metal shell and the exciting coil is less than 0.2 mm.
By adopting the technical scheme, the exciting coil is arranged close to the insulating protection plate, so that an eddy current magnetic field can be excited in the detected object.
The utility model discloses further set up to: the connecting piece includes the locating lever and links the piece, and on the locating lever was fixed in metal casing's inner wall, even the piece was fixed in on the support frame and the locating lever one-to-one setting, even the piece seted up with the draw-in groove of locating lever cooperation joint.
By adopting the technical scheme, the clamping groove is opposite to the positioning rod when the supporting frame is installed through the positioning rod and the connecting block, and the supporting frame is moved along the extending direction of the positioning rod, so that the support frame is prevented from being deviated or turned over, and the pre-fixing effect is realized.
The utility model discloses further set up to: the locating lever inclines towards the vertical central line of the metal shell along the vertical direction, and a reinforcing rod for supporting the locating lever is arranged on the inner wall of the metal shell.
Adopt above-mentioned technical scheme, set up the locating lever slope to when the support frame removed along the locating lever and supported tightly to draw-in groove inner wall and locating lever, the restriction support frame continuously removed, thereby realized the preliminary fixation of support frame, in order to improve the stability of probe.
The utility model discloses further set up to: an elastic lug is fixed on the surface of the positioning rod facing the clamping groove, and when the inner wall of the clamping groove is tightly abutted against the positioning rod, the elastic lug is positioned above the connecting block and tightly abutted against the connecting block.
Adopt above-mentioned technical scheme, through setting up elastic convex block, when even piece and elastic convex block butt, continue to remove along the extending direction of locating lever to make elastic convex block pass the draw-in groove, and elastic convex block is located even piece top and supports tightly with even piece, thereby restriction even piece breaks away from the locating lever, realizes the stable equipment of probe.
To sum up, the utility model discloses a beneficial technological effect does:
(1) the position relation between the coils is reasonably arranged by arranging the pair of detection coils and the excitation coil, so that the distance range between the sensing surface of the probe and a measured object is enlarged, the maximum sensing distance of the probe can reach about 5mm, and the applicable working range of the eddy current probe is enlarged;
(2) the metal shell is arranged, so that the shielding effect on the detection coil and the excitation coil is realized, and the interference of the environment on the probe is reduced;
(3) through reasonable arrangement of the insulating wear-resisting plate, eddy current signals can be better transmitted into the probe, meanwhile, abrasion of workpieces to the end face of the probe is avoided, and the detection coil and the excitation coil are protected.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a partial schematic view of fig. 1, showing the internal structure of the metal housing.
Reference numerals: 1. a support frame; 2. a detection coil; 3. an excitation coil; 4. a metal housing; 5. an insulating wear plate; 7. positioning a rod; 8. connecting blocks; 9. a reinforcing bar; 10. an epoxy resin; 11. a wire; 12. an elastic bump.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 2, a differential eddy current probe with a large lift-off distance includes a support frame 1, a detection coil 2, and an excitation coil 3.
Referring to fig. 2, two detection coils 2 are arranged and respectively mounted on the support frame 1, the detection coils 2 are arranged in parallel, the detection coils 2 are arranged in a rectangular shape, and the central line is arranged horizontally; excitation coil 3 is the annular setting, and the vertical setting of the central line of excitation coil 3, and excitation coil 3 synchronous cover locate detection coil 2 on, and one side terminal surface of both is on the coplanar, still is fixed with the isolating ring between excitation coil 3 and the detection coil 2 to avoid detection coil 2 and excitation coil 3 contact, and the remaining tip of detection coil 2, excitation coil 3 is connected with wire 11 respectively electricity, thereby can realize corresponding circuit adjustment through the connection of terminal and wire 11.
Referring to fig. 1 and 2, the detection probe further includes a metal shell 4 and an insulating protection plate 5, the metal shell 4 is disposed in an annular shape, an axis of the metal shell 4 may be overlapped with a central line of the exciting coil 3, the insulating protection plate 5 is used for closing one end of the metal shell 4, so that an installation cavity is formed between the insulating protection plate 5 and the metal shell 4, and the detection coil 2 and the exciting coil 3 are located in the installation cavity, thereby achieving a protection effect.
Referring to fig. 2, in which an insulating protection plate 5 may be adhered to a metal housing 4, the insulating wear plate 6 may be provided as an epoxy thin plate having a thickness of 0.4mm ~ 0.6.6 mm, and an insulating property thereof may prevent interference with an eddy current signal, a surface of the insulating wear plate 5 facing the inside of the metal housing 4 is spaced from the detection coil 2 by less than 0.2mm, the excitation coil 3 is provided adjacent to the insulating wear plate 5, and a surface of the insulating wear plate 5 facing the inside of the metal housing 4 is spaced from the excitation coil 3 by less than 0.2mm, thereby controlling a lift-off distance of the inside of the probe itself and securing an excitation effect.
Referring to fig. 2, the metal casing connecting device further comprises a plurality of connecting pieces which are uniformly distributed along the circumferential direction of the metal casing 4, and each connecting piece comprises a positioning rod 7, a connecting block 8 and a reinforcing rod 9 which are arranged in a one-to-one correspondence manner. One end of the positioning rod 7 is far away from the insulation protection plate 5 and is fixed on the inner wall of the metal shell 4, the other end of the positioning rod is close to the insulation protection plate 5 and inclines towards the circumferential direction of the metal shell 4, one end of the reinforcing rod 9 is fixed on the support, the other end of the reinforcing rod and the positioning rod 7 are fixed towards the end part of the insulation protection plate 5, and the reinforcing rod 9 is arranged along the radial direction of the inner wall of the metal shell 4.
Referring to fig. 2, one end of the connecting block 8 is fixed on the support frame 1, the other end is close to the inner wall of the metal shell 4, the connecting block 8 is far away from one end of the support frame 1, and a clamping groove is formed in the end, matched with the positioning rod 7, of the support frame 1, so that when the support frame 1 is placed inside the metal shell 4, the clamping groove is connected with the corresponding positioning rod 7 in a clamped mode, and the support frame 1 can be stably placed inside the metal shell 4.
Referring to fig. 1 and 2, an elastic bump 12 is fixed on a surface of the positioning rod 7 facing the support frame 1, the elastic bump 12 is formed in a hemispherical shape, and the elastic bump 12 is formed in a nylon material. On the installation support frame 1, the elastic lug 12 penetrates through the clamping groove, and the elastic lug 12 is located above the connecting block 8 and is tightly abutted against the connecting block 8, so that the connecting block 8 is limited to be separated from the positioning rod 7, and the stable assembly of the probe is realized. And the inner opening of the metal shell 4 can be filled with epoxy resin 10 to improve the overall stability of the probe.
The implementation principle of the embodiment is as follows: when assembling this probe, with the one end orientation insulation protection board 5 of exciting coil 3, make locating lever 7 card go into in the draw-in groove, will make elasticity lug 12 pass the draw-in groove, and elasticity lug 12 is located even 8 tops and supports tightly with even piece 8 to restriction even piece 8 breaks away from locating lever 7, then fills epoxy 10 to metal casing 4 intussuseption, treats epoxy 10 solidification back, realizes the holistic stability of probe.
The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (8)
1. The differential eddy current detection probe with the large lifting distance is characterized by comprising a support frame (1), two detection coils (2) and an excitation coil (3), wherein the two detection coils (2) are arranged on the support frame (1) and fixedly arranged on the support frame, the two detection coils (2) are in differential connection and are distributed at intervals in the horizontal direction, and the excitation coil (3) is synchronously sleeved on the two detection coils (2).
2. The differential eddy current inspection probe with large lift-off distance according to claim 1, further comprising a metal shell (4) and a connector, wherein the support frame (1) is installed in the metal shell (4) through the connector.
3. A differential eddy current inspection probe with large lift-off distance according to claim 2, further comprising an insulating wear plate (5), wherein the insulating wear plate (5) is fixed on the metal casing (4) and closes one end opening of the metal casing (4).
4. A large lift-off differential eddy current inspection probe according to claim 3, wherein the distance between the face of the insulating wear plate (5) facing the inside of the metal housing (4) and the detection coil (2) is less than 0.2 mm.
5. A large lift-off differential eddy current inspection probe according to claim 3, wherein the excitation coil (3) is located close to the insulating wear plate (5), the corresponding distance between the face of the insulating wear plate (5) facing the inside of the metal casing (4) and the excitation coil (3) being less than 0.2 mm.
6. The differential eddy current inspection probe with the large lifting distance according to claim 2, wherein the connecting piece comprises a positioning rod (7) and a connecting block (8), the positioning rod (7) is fixed on the inner wall of the metal shell (4), the connecting block (8) is fixed on the support frame (1) and the positioning rods (7) are arranged in a one-to-one correspondence manner, and a clamping groove matched and clamped with the positioning rod (7) is formed in the connecting block (8).
7. A differential eddy current inspection probe with large lift-off distance according to claim 6, characterized in that the locating rod (7) is inclined in the vertical direction towards the vertical midline of the metal shell (4), and the inner wall of the metal shell (4) is provided with a reinforcing rod (9) for supporting the locating rod (7).
8. The differential eddy current inspection probe with large lift-off distance according to claim 6, wherein the elastic bump (12) is fixed on the surface of the positioning rod (7) facing the slot, and when the inner wall of the slot is tightly pressed against the positioning rod (7), the elastic bump (12) is located above the connecting block (8) and tightly pressed against the connecting block (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920720189.XU CN209992435U (en) | 2019-05-18 | 2019-05-18 | Differential eddy current testing probe with large lift-off distance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920720189.XU CN209992435U (en) | 2019-05-18 | 2019-05-18 | Differential eddy current testing probe with large lift-off distance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209992435U true CN209992435U (en) | 2020-01-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920720189.XU Active CN209992435U (en) | 2019-05-18 | 2019-05-18 | Differential eddy current testing probe with large lift-off distance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209992435U (en) |
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2019
- 2019-05-18 CN CN201920720189.XU patent/CN209992435U/en active Active
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