CN212964756U - Self-rotating eddy current detection probe - Google Patents
Self-rotating eddy current detection probe Download PDFInfo
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- CN212964756U CN212964756U CN202020939684.2U CN202020939684U CN212964756U CN 212964756 U CN212964756 U CN 212964756U CN 202020939684 U CN202020939684 U CN 202020939684U CN 212964756 U CN212964756 U CN 212964756U
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Abstract
The utility model discloses a from rotary eddy current testing probe, including probe head, extension cable subassembly, sliding ring protective housing, signal transmission sliding ring, probe skeleton and detection coil, probe head be connected with the sliding ring protective housing through extension cable subassembly, the sliding ring protective housing endotheca is equipped with the signal transmission sliding ring, the signal transmission sliding ring is connected with the probe skeleton that sets up outside the sliding ring protective housing, is provided with the detection coil on the probe skeleton. The beneficial effects of the utility model reside in that: the external integral structure of the coil framework of the utility model adopts a profiling design, and the coil part adopts an oval design, so as to ensure the trafficability of the probe in the spiral flat tube; the utility model adopts the design of the signal transmission slip ring, avoids the cable winding and realizes the stable transmission of eddy current signals; the utility model discloses need not be with the help of exogenic action, vortex probe just can realize the vortex signal acquisition to the flat pipe of spiral at the flat intraductal rotary motion of spiral.
Description
Technical Field
The utility model belongs to detect and use the probe, concretely relates to autogyration formula vortex detection probe.
Background
The spiral flat pipe is also called as a twist pipe, and the unique structural design of the spiral flat pipe enables the speed and the direction of shell pass fluid to be periodically changed, and the shell pass fluid and the tube pass fluid are in a spiral motion state at the same time, so that the turbulence degree is enhanced. The heat transfer efficiency of the spiral flat tube heat exchanger is 40% higher than that of the common heat exchanger, and the pressure drop is almost equal. Since 1984, thousands of spiral flat tube heat exchangers were manufactured and sold all over the world, mainly used for gas-gas, liquid-liquid and liquid-gas heat exchange processes, and spread over multiple industries such as chemistry, petroleum, food, paper making, electric power, metallurgy, mining industry, urban heating and the like.
The spiral flat tube is formed by two manufacturing processes of 'deflection' and 'distortion', any cross section of the heat exchange section of the tube is oval, and the tube can be a mixed tube bundle or a pure spiral flat tube bundle when the heat exchanger is assembled. The spiral flat structure design is limited in detection means for the spiral flat pipe and low in detection sensitivity. At present, nondestructive detection of the spiral flat pipe is mainly implemented at home and abroad by a helium leak detection method, but the helium leak detection method can only find perforation defects and cannot pre-judge the quality of the spiral flat pipe in advance.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a from rotary eddy current inspection probe, it does not need exogenic action just can drive the oval coil of front end and carries out spiral scanning in the flat pipe of spiral and looks into to accomplish the eddy current inspection of the flat pipe of spiral.
The technical scheme of the utility model as follows: the utility model provides a from rotary eddy current testing probe, includes probe joint, extension cable subassembly, sliding ring protective housing, signal transmission sliding ring, probe skeleton and detection coil, probe joint be connected with the sliding ring protective housing through extension cable subassembly, the sliding ring protective housing endotheca is equipped with the signal transmission sliding ring, the signal transmission sliding ring is connected with the probe skeleton that sets up outside the sliding ring protective housing, is provided with the detection coil on the probe skeleton.
The probe joint is connected with the extension cable assembly in a welding mode.
The extension cable assembly is protected by a plastic sleeve, the eddy current signal transmission cable and the pull-off preventing steel wire rope penetrate through the plastic sleeve, and the plastic sleeve outside the extension cable assembly is connected with the slip ring protection shell in a glue pouring mode.
The signal transmission slip ring is arranged in the slip ring protective shell, and the slip ring protective shell is made of stainless steel materials.
The signal transmission slip ring comprises an outer slip ring, signal input contact rings, an inner slip ring and signal receiving spring leaves, wherein the signal input contact rings are distributed at a certain distance in the axial direction of the inner slip ring, the total number of the signal input contact rings is 4, the signal input contact rings are embedded in the inner slip ring, the signal receiving spring leaves are distributed at a certain distance in the axial direction of the outer slip ring, the total number of the signal input contact rings is 4, one side of each signal receiving spring leaf is embedded in the outer slip ring, the other side of each signal receiving spring leaf is lapped with the corresponding signal input contact ring, and each signal receiving spring leaf is lapped with the corresponding signal.
And the eddy current signal transmission cable in the extension cable assembly is connected with the signal receiving spring piece of the signal transmission slip ring, and the pull-off preventing steel wire rope in the extension cable assembly is welded on the slip ring protective shell.
One end of the probe framework is a conical body, the probe framework is made of nylon materials, and the shape of the probe framework is similar to the internal structure of the spiral flat tube.
And a hole is reserved in the probe framework and used for leading out four wires of the detection coil and is respectively connected with four signal input contact rings of the left inner slip ring.
Two elliptical grooves are reserved at the front end of the probe framework.
The detection coil consists of an excitation winding and a receiving winding which are respectively positioned in two elliptical grooves at the front end of the probe framework.
The beneficial effects of the utility model reside in that:
(1) the external integral structure of the coil framework of the utility model adopts a profiling design, and the coil part adopts an oval design, so as to ensure the trafficability of the probe in the spiral flat tube;
(2) the utility model adopts the design of the signal transmission slip ring, avoids the cable winding and realizes the stable transmission of eddy current signals;
(3) the utility model discloses need not be with the help of exogenic action, vortex probe just can realize the vortex signal acquisition to the flat pipe of spiral at the flat intraductal rotary motion of spiral.
Drawings
Fig. 1 is a schematic view of a self-rotating eddy current inspection probe according to the present invention;
fig. 2 is an axial cross-sectional view of a signal transmission slip ring of a self-rotating eddy current inspection probe according to the present invention;
fig. 3 is a circumferential direction cross-sectional view of a signal transmission slip ring of a self-rotating eddy current inspection probe according to the present invention;
fig. 4 is a working diagram of the signal transmission slip ring detection of the self-rotating eddy current inspection probe provided by the present invention.
In the figure, 1 probe connector, 2 extension cable assembly, 3 slip ring protective housing, 4 signal transmission slip rings, 5 probe skeletons, 6 detection coils, 41 outer slip rings, 42 signal input contact rings, 43 inner slip rings, 44 signal receiving spring leaves, 7 spiral flat tubes and 8 detection probes.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The purpose of this sending is to spiral flat tube eddy current testing, provides a dedicated autogyration formula eddy current testing probe, and this probe belongs to interior formula eddy current testing that passes through, can follow spiral flat tube inside and implement eddy current testing.
As shown in fig. 1, a self-rotating eddy current inspection probe comprises six parts, namely a probe joint 1, an extension cable assembly 2, a slip ring protective shell 3, a signal transmission slip ring 4, a probe framework 5 and a detection coil 6.
Wherein, probe joint 1 is connected with sliding ring protective housing 3 through extension cable assembly 2, and sliding ring protective housing 3 is tube-shape hollow structure, and its endotheca is equipped with signal transmission sliding ring 4, and signal transmission sliding ring 4 is connected with the probe skeleton 5 that sets up outside sliding ring protective housing 3, is provided with detection coil 6 on the probe skeleton 5.
The probe connector 1 can be matched with a connector of a proper type according to a panel using the eddy current detector, is connected with the extension cable assembly 2 in a welding mode, the outside of the extension cable assembly 2 is protected by a plastic sleeve, and an eddy current signal transmission cable and an anti-pull-off steel wire rope penetrate through the inside of the plastic sleeve. The plastic sleeve outside the extension cable assembly 2 is connected with the slip ring protection shell 3 on the right side in a glue pouring mode, the eddy current signal transmission cable inside the extension cable assembly 2 is connected with the signal receiving spring piece 44 of the signal transmission slip ring 4, the pull-off preventing steel wire rope inside the extension cable assembly 2 is welded on the left side of the slip ring protection shell 3, and the fact that the spiral flat tube can be retracted when the signal transmission slip ring 4 and the probe framework 5 are accidentally broken is guaranteed.
The signal transmission slip ring 4 is arranged in the slip ring protective shell 3, and the slip ring protective shell 3 is usually made of stainless steel materials. When the slip ring protective housing 3 passes through the spiral flat tube, the slip ring protective housing can effectively protect the signal transmission slip ring 4 from being damaged, and further plays a role in preventing water and shielding interference signals. The outer diameter of the slip ring protection shell 3 is smaller than the length of the short shaft of the elliptical cross section of the spiral flat pipe so as to ensure that the slip ring protection shell smoothly passes through the spiral flat pipe. The inner slip ring 43 of the signal transmission slip ring 4 is connected with the left probe skeleton 5 through a rigid structure.
The signal transmission slip ring 4 is one of the components of the core of the present invention, and the signal transmission slip ring 4 includes an outer slip ring 41, a signal input contact ring 42, an inner slip ring 43, and a signal receiving spring piece 44. A signal input contact ring 42 is distributed in the axial direction of the inner sliding ring 43 at a certain distance, and 4 input contact rings 42 are totally distributed, wherein the signal input contact rings 42 are embedded in the inner sliding ring 43 and are distributed in the circumferential direction at 360 degrees. A signal receiving spring leaf 44 is distributed in the axial direction of the outer sliding ring 41 at a certain distance, 4 input contact rings 42 are totally arranged, one side of the signal receiving spring leaf 44 is embedded in the outer sliding ring 41, the other side of the signal receiving spring leaf 44 is overlapped with the signal input contact ring 42, and each signal receiving spring leaf 44 is overlapped with one signal input contact ring 42. When the probe framework 5 drives the inner slip ring 43 to rotate, the signal receiving spring piece 44 and the signal input contact ring 42 are always in a contact state, so that the transmission of eddy current signals is realized.
The left side of the probe framework 5 is connected with the inner sliding ring 43, the right end of the probe framework 5 adopts a cone-shaped body design, the probe framework 5 is made of a nylon material, and the shape of the probe framework is consistent with the internal structure of the spiral flat pipe. A hole is reserved in the probe framework 5 and used for leading out four wires of the detection coil 6 and is respectively connected with four signal input contact rings 42 of the left inner slip ring 43. In order to ensure sufficient detection sensitivity, the filling factor is preferably 80% or more, that is, 2% or more (the outer diameter of the detection coil 6/the inner diameter of the spiral flat tube) is 80% or more. Two elliptical grooves are reserved at the front end of the probe framework 5, the width, the depth and the distance of the elliptical grooves are all 1.5mm, and an enameled wire with a proper size is selected to be wound into the detection coil 6. The detection coil 6 consists of an excitation winding and a receiving winding which are respectively positioned in two elliptical grooves at the front end of the probe framework 5.
The utility model discloses a use as follows:
the detection working state of the self-rotating eddy current detection probe is as shown in the following figure 4, when the self-rotating eddy current detection probe 8 advances or retreats in the spiral flat tube, because the appearance of the eddy current detection probe at the front end is similar to the internal structure of the spiral flat tube 7, the front end eddy current detection probe part can rotate in the spiral flat tube 7, the inner slip ring 43 of the transmission slip ring 5 can be driven to rotate together during rotation, the input contact ring 42 of the signal of the inner slip ring 43 and the signal receiving spring piece 44 of the outer slip ring 41 can be always in a contact state at the moment, eddy current signals can be stably transmitted out, and the eddy current detection of the self-rotating eddy current detection probe 8 on the spiral flat tube 7 is realized.
The detection working principle of the self-rotating eddy current detection probe is as follows: when an exciting winding of the detection coil 6 is electrified, eddy current can be induced in the spiral flat tube 7, a receiving winding in the detection coil 6 is under the action of the electrified exciting winding, the induced current in the receiving winding and the eddy current at each point in the spiral flat tube 7 form a magnetic field, and an electromagnetic induction effect is generated on the exciting winding in turn, the change of the eddy current in the spiral flat tube 7 and the change of the current in the receiving winding are influenced by the change of the current in the exciting winding, so that a stable state is achieved, when a defect occurs in the spiral flat tube 7, the original stable state is damaged, and the defect information can be obtained from an output signal of the receiving winding.
Claims (10)
1. A self-rotating eddy current inspection probe is characterized in that: including probe joint, extension cable assembly, sliding ring protective housing, signal transmission sliding ring, probe skeleton and detection coil, probe joint be connected with the sliding ring protective housing through extension cable assembly, the sliding ring protective housing endotheca is equipped with the signal transmission sliding ring, the signal transmission sliding ring is connected with the probe skeleton that sets up outside the sliding ring protective housing, is provided with the detection coil on the probe skeleton.
2. A self-rotating eddy current inspection probe, as in claim 1, wherein: the probe joint is connected with the extension cable assembly in a welding mode.
3. A self-rotating eddy current inspection probe, as in claim 1, wherein: the extension cable assembly is protected by a plastic sleeve, the eddy current signal transmission cable and the pull-off preventing steel wire rope penetrate through the plastic sleeve, and the plastic sleeve outside the extension cable assembly is connected with the slip ring protection shell in a glue pouring mode.
4. A self-rotating eddy current inspection probe, as in claim 1, wherein: the signal transmission slip ring is arranged in the slip ring protective shell, and the slip ring protective shell is made of stainless steel materials.
5. A self-rotating eddy current inspection probe, as in claim 1, wherein: the signal transmission slip ring comprises an outer slip ring, signal input contact rings, inner slip rings and signal receiving spring leaves, wherein the signal input contact rings are distributed in the axial direction of the inner slip ring at a certain distance, the total number of the signal input contact rings is 4, the signal input contact rings are embedded in the inner slip rings, the signal receiving spring leaves are distributed in the axial direction of the outer slip ring at a certain distance, one side of each signal receiving spring leaf is embedded in the outer slip ring, the other side of each signal receiving spring leaf is lapped with the signal input contact rings, and each signal receiving spring leaf is lapped with one signal input contact ring.
6. A self-rotating eddy current inspection probe, as in claim 5, wherein: and the eddy current signal transmission cable in the extension cable assembly is connected with the signal receiving spring piece of the signal transmission slip ring, and the pull-off preventing steel wire rope in the extension cable assembly is welded on the slip ring protective shell.
7. A self-rotating eddy current inspection probe, as in claim 1, wherein: one end of the probe framework is a conical body, the probe framework is made of a nylon material, and the shape of the probe framework is similar to the internal structure of the spiral flat tube.
8. A self-rotating eddy current inspection probe, as in claim 7, wherein: and a hole is reserved in the probe framework and used for leading out four wires of the detection coil and is respectively connected with four signal input contact rings of the left inner slip ring.
9. A self-rotating eddy current inspection probe, as in claim 7, wherein: two elliptical grooves are reserved at the front end of the probe framework.
10. A self-rotating eddy current inspection probe, as in claim 1, wherein: the detection coil consists of an excitation winding and a receiving winding which are respectively positioned in two elliptical grooves at the front end of the probe framework.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020939684.2U CN212964756U (en) | 2020-05-29 | 2020-05-29 | Self-rotating eddy current detection probe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020939684.2U CN212964756U (en) | 2020-05-29 | 2020-05-29 | Self-rotating eddy current detection probe |
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| CN212964756U true CN212964756U (en) | 2021-04-13 |
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| CN202020939684.2U Active CN212964756U (en) | 2020-05-29 | 2020-05-29 | Self-rotating eddy current detection probe |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113702488A (en) * | 2021-09-09 | 2021-11-26 | 国家石油天然气管网集团有限公司华南分公司 | Coaxial circular rectangular double-coil eddy current probe |
| CN113898820A (en) * | 2021-09-26 | 2022-01-07 | 天津精仪精测科技有限公司 | Rotary towing cable detector and use method |
-
2020
- 2020-05-29 CN CN202020939684.2U patent/CN212964756U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113702488A (en) * | 2021-09-09 | 2021-11-26 | 国家石油天然气管网集团有限公司华南分公司 | Coaxial circular rectangular double-coil eddy current probe |
| CN113898820A (en) * | 2021-09-26 | 2022-01-07 | 天津精仪精测科技有限公司 | Rotary towing cable detector and use method |
| CN113898820B (en) * | 2021-09-26 | 2023-03-14 | 天津精仪精测科技有限公司 | Rotary towing cable detector and use method |
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