阅读说明：本技术 一种自旋转式涡流检测探头 (Self-rotating eddy current detection probe ) 是由 肖镇官 崔洪岩 张伟 陈胜宇 冯俊 袁骊 于 2020-05-29 设计创作，主要内容包括：本发明公开了一种自旋转式涡流检测探头,包括探头接头、延长电缆组件、滑环保护壳、信号传输滑环、探头骨架和检测线圈,所述的探头接头通过延长电缆组件与滑环保护壳连接,滑环保护壳内套装有信号传输滑环,信号传输滑环与设置在滑环保护壳外的探头骨架连接,探头骨架上设置有检测线圈。本发明的有益效果在于：本发明的线圈骨架外部整体结构采用仿形设计,线圈部分采用椭圆形设计,保证探头在螺旋扁管内的通过性；本发明采用信号传输滑环设计,避免电缆缠绕,实现涡流信号平稳传输；本发明不需借助外力作用,涡流探头就能在螺旋扁管内旋转运动,实现对螺旋扁管的涡流信号采集。(The invention discloses a self-rotating eddy current detection probe, which comprises a probe joint, an extension cable assembly, a slip ring protective shell, a signal transmission slip ring, a probe framework and a detection coil, wherein the probe joint is connected with the slip ring protective shell through the extension cable assembly, the signal transmission slip ring is sleeved in the slip ring protective shell and is connected with the probe framework arranged outside the slip ring protective shell, and the detection coil is arranged on the probe framework. The invention has the beneficial effects that: the external integral structure of the coil framework adopts a profiling design, and the coil part adopts an oval design, so that the trafficability of the probe in the spiral flat tube is ensured; the invention adopts the signal transmission slip ring design, avoids the cable winding and realizes the stable transmission of eddy current signals; the vortex probe can rotate in the spiral flat tube without the action of external force, so that the vortex signal acquisition of the spiral flat tube is realized.)

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, 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 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.

Technical Field

The invention belongs to a probe for detection, and particularly relates to a self-rotating eddy current 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.

Disclosure of Invention

The invention aims to provide a self-rotating eddy current testing probe which can drive an oval coil at the front end to carry out spiral scanning in a spiral flat pipe without external force, thereby completing eddy current testing of the spiral flat pipe.

The technical scheme of the invention is 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 input contact ring.

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 invention has the beneficial effects that:

(1) the external integral structure of the coil framework adopts a profiling design, and the coil part adopts an oval design, so that the trafficability of the probe in the spiral flat tube is ensured;

(2) the invention adopts the signal transmission slip ring design, avoids the cable winding and realizes the stable transmission of eddy current signals;

(3) the vortex probe can rotate in the spiral flat tube without the action of external force, so that the vortex signal acquisition of the spiral flat tube is realized.

Drawings

FIG. 1 is a schematic diagram 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 diagram illustrating the detection operation of the signal transmission slip ring of the self-rotating eddy current inspection probe according to 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 invention is described in further detail below with reference to the figures and the 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 invention, and the signal transmission slip ring 4 comprises an outer slip ring 41, a signal input contact ring 42, an inner slip ring 43 and a signal receiving spring sheet 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 using process of the invention is 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.