Eddy current probe guiding device

Abstract

The utility model discloses an eddy current probe guiding device which comprises a positioning block, a connecting hole and two guiding columns parallel to the axis of the connecting hole are arranged on the positioning block, the two ends of the connecting hole are located on a first end face and a second end face which are oppositely arranged on the positioning block respectively, and the two guiding columns are vertically arranged and arranged on the second end face in a protruding mode. The diameter of the connecting hole is matched with the outer diameter of a vortex probe guide pipe, the outer diameter of each guide column is matched with the hole diameter of a heat exchange pipe hole, and the distance between the two guide columns is matched with the distance between the heat exchange pipe holes. Two limiting clamping grooves which are identical in structure and completely communicated with the connecting hole in the horizontal direction are formed in the side face of the positioning block at intervals, each limiting clamping groove comprises a first groove section, a second groove section and a third groove section which are communicated in sequence, the first groove section is parallel to the axis of the connecting hole and communicated with the first end face, and an included angle is formed between the third groove section and the horizontal plane; the two guide columns are inserted into the pipe holes in the two sides of the to-be-detected pipe hole so that eddy current data can be collected, guiding of the eddy current probe is achieved, and operation is convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of eddy current probe detection, and in particular relates to an eddy current probe guiding device. Background Art

[0002] At present, the heat exchange tubes of the steam generator and waste heat exhaust heat exchanger of the main equipment of the nuclear island need to be tested for eddy current profile after hydraulic expansion. When using the manual mode for detection, the eddy current probe enters the heat exchange tube from the tube mouth, and pulls back after reaching the predetermined position, and collects eddy current data when pulling back. The eddy current probe enters the tube hole of the heat exchange tube from the eddy current instrument through the probe guide tube. The positioning stability of the probe is not strong, and it may be misguided, and the eddy current probe enters the tube hole that is not correctly numbered in the inspection plan. In addition, the operator needs to hold the probe guide tube tightly throughout the process until the eddy current data collection of the current heat exchange tube is completed. The arm muscles are tense most of the time during the work process, and it is very easy to get tired.

[0003] Therefore, a new technology is needed to solve the problems of eddy current probe guiding error and inconvenient detection operation during eddy current profile detection in the prior art. Utility Model Content

[0004] In order to solve the above problems in the prior art, the utility model provides an eddy current probe guiding device, which has the effect of guiding the eddy current probe when the eddy current is performing contour detection and is easy to operate.

[0005] The utility model adopts the following technical solutions:

[0006] An eddy current probe guide device, comprising a positioning block, the positioning block is provided with a connecting hole and two guide columns, the two ends of the connecting hole are respectively located at a first end face and a second end face oppositely arranged on the positioning block, the two guide columns are convexly arranged on the second end face, each of the guide columns is vertically arranged and parallel to the axis of the connecting hole; the diameter of the connecting hole is adapted to the outer diameter of the eddy current probe catheter, the connecting hole can be used for the eddy current probe catheter to be inserted, the outer diameter of each of the guide columns is adapted to the aperture of the heat exchange tube hole, and the spacing between the two guide columns is adapted to the spacing between the corresponding heat exchange tube holes;

[0007] Two limiting slots with the same structure and completely connected with the connecting hole in the horizontal direction are arranged on the side of the positioning block, each of the limiting slots includes a first slot section, a second slot section and a third slot section which are connected in sequence, the first slot section is parallel to the axis of the connecting hole and connected with the first end face, the second slot section is arranged horizontally, and the third slot section has an angle with the horizontal plane and is located above the second slot section.

[0008] As a further improvement of the technical solution of the utility model, the connecting hole is a stepped hole, comprising a first section and a second section that are interconnected, the first section being close to the first end face and having a larger aperture than the second section, the aperture of the first section being adapted to the outer diameter of the eddy current probe conduit, and the second section being capable of allowing the eddy current probe to pass through.

[0009] As a further improvement of the technical solution of the utility model, a step surface is provided on the side of each guide column away from the first end surface, and the outer diameter of the step surface is larger than the aperture of the tube hole of the heat exchange tube.

[0010] As a further improvement of the technical solution of the utility model, each of the guide columns is a nylon pin.

[0011] As a further improvement of the technical solution of the utility model, the positioning block includes a guide sleeve and a positioning plate which are detachably fixed to each other, the guide column is installed on one end of the positioning plate away from the guide sleeve, the positioning plate is provided with a through hole, the center hole of the guide sleeve is connected to the through hole to form the connecting hole, the two limit slots are located on the guide sleeve, and the positioning plate is made of nylon.

[0012] As a further improvement of the technical solution of the utility model, the distance between the step surface and the end surface of the positioning plate close to one end of the guide column is not less than 5 mm.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The eddy current probe guide device of this solution is installed at the end of the eddy current duct, and the guide columns on both sides of the device are used to position the heat exchanger tube sheet. The eddy current probe enters the heat exchange tube to be inspected from the connecting hole. Different positioning blocks can be designed according to the tube hole spacing of steam generators of different types and waste heat exhaust heat exchangers to adapt to different products. When performing manual eddy current testing, insert the two guide columns into the tube holes on both sides of the tube hole to be inspected, and use a little force to make the positioning block stick to the tube sheet, and then you can start eddy current data collection. The operation is simple and easy to position, which solves the problems of easy positioning of the wrong tube hole when guiding the eddy current probe during manual eddy current testing and high labor intensity for workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The technology of the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0016] Figure 1 It is a perspective view of the overall structure of the utility model;

[0017] Figure 2 This is the main view of the overall structure of the utility model;

[0018] Figure 3This is a top view of the overall structure of the utility model;

[0019] Figure 4 is a perspective view of the guide sleeve;

[0020] Figure 5 yes Figure 4 A perspective view of the middle guide sleeve when looking up;

[0021] Figure 6 It is a schematic diagram of the structure when the guide column is a positioning pin.

[0022] Reference numerals:

[0023] 1-guide sleeve; 11-center hole; 12-limiting slot; 121-first slot section; 122-second slot section; 123-third slot section;

[0024] 2-positioning plate; 21-through hole; 22-pin hole;

[0025] 3-guide column; 31-step; 311-step surface;

[0026] 4-connecting hole; 41-first section; 42-second section. DETAILED DESCRIPTION

[0027] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of the utility model, so as to fully understand the purpose, scheme and effect of the utility model. It should be noted that the embodiments and features in the embodiments in this application can be combined with each other without conflict. The same reference numerals used throughout the drawings indicate the same or similar parts.

[0028] It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or it can be indirectly fixed or connected to the other feature. In addition, the descriptions of up, down, left, right, etc. used in the present invention are only relative to the relative positional relationship of the components of the present invention in the accompanying drawings.

[0029] Reference Figures 1 to 6, an eddy current probe guide device, comprising a positioning block, a connecting hole 4 and two guide columns 3 are provided on the positioning block, the two ends of the connecting hole 4 are respectively located at the first end face and the second end face which are arranged opposite to each other on the positioning block, the two guide columns 3 are convexly arranged on the second end face, each of the guide columns 3 is arranged vertically and parallel to the axis of the connecting hole 4; the diameter of the connecting hole 4 is adapted to the outer diameter of the eddy current probe catheter, the connecting hole 4 can be inserted into the eddy current probe catheter, the outer diameter of each of the guide columns 3 is adapted to the aperture of the heat exchange tube hole, and the spacing between the two guide columns 3 is adapted to the spacing between the corresponding two heat exchange tube holes. The two heat exchange tube holes can be located between the heat exchange tube holes to be detected. The side of the positioning block is provided with two limit slots 12 of the same structure and completely connected with the connecting hole 4 in the horizontal direction. Each of the limit slots 12 includes a first slot section 121, a second slot section 122 and a third slot section 123 connected in sequence. The first slot section 121 is parallel to the axis of the connecting hole 4 and connected with the first end face. The second slot section 122 is arranged horizontally. The third slot section 123 has an angle with the horizontal plane and is located above the second slot section 122. Figure 2 The first slot section 121 and the second slot section 122 can be connected to form an L shape, and the third slot section 123 can be vertically arranged and parallel to the first slot section 121.

[0030] The eddy current probe guide device of this solution is installed at the end of the eddy current duct, and the guide columns 3 on both sides of the device are used to position the heat exchanger tube sheet. The eddy current probe enters the heat exchange tube to be inspected from the connecting hole 4. Different positioning blocks can be designed according to the tube hole spacing of steam generators of different types and waste heat exhaust heat exchangers to adapt to different products. When performing manual eddy current testing, insert the two guide columns 3 into the tube holes on both sides of the tube hole to be inspected, and use a little force to make the positioning blocks stick to the tube sheet, and then start eddy current data collection. The eddy current probe has strong positioning stability, and there will be no guiding errors. The eddy current probe will not enter the tube hole that is not correctly numbered in the inspection plan. The eddy current probe guide device of this solution is simple to operate and easy to position. It solves the problems of the eddy current probe being easy to position the wrong tube hole when guiding during manual eddy current testing, the high labor intensity of the staff, and the risk of damaging the sealing weld.

[0031] An elastic member is provided between the eddy current probe conduit and the guide sleeve 1. The elastic member can be preferably a spring. The spring is sleeved on the outside of the eddy current probe conduit. One end of the spring is detachably fixedly connected to the eddy current probe conduit, and the other end can abut against the guide sleeve 1. The outside of the eddy current probe conduit is provided with two protrusions corresponding to the limit slot 12. When the eddy current probe conduit is inserted into the connecting hole 4, the protrusion can be inserted into the limit slot 12 and slide along the limit slot 12. At this time, the spring is compressed. When the protrusion slides to the connection node between the first slot section 121 and the second slot section 122, the protrusion can be slid into the third slot section 123 by rotating the positioning block or the eddy current probe conduit. Due to the elastic effect of the spring, the protrusion is located on the end of the third slot section 123 away from the second slot section 122, thereby fixing the eddy current probe conduit and the positioning block together and preventing relative rotation, so that the connection structure between the eddy current probe conduit and the positioning block is relatively stable and will not separate during use to affect the detection.

[0032] Specifically, refer to Figure 6 The guide column 3 can be preferably a pin, and the material of the guide column 3 can be preferably a plastic material. Each of the guide columns 3 can be preferably a nylon pin. The guide column 3 made of plastic material can play a guiding role without damaging the sealing weld. The guide column 3 is detachable, and guide columns 3 of different sizes can be replaced according to different heat exchange plate tube hole diameters.

[0033] Specifically, refer to Figure 1 The connecting hole 4 is a step 31 hole, and the connecting hole 4 includes a first section 41 and a second section 42 which are interconnected. The first section 41 is close to the first end face and has a larger aperture than the second section 42. The aperture of the first section 41 is adapted to the outer diameter of the eddy current probe conduit, and the second section 42 is for the eddy current probe to pass through.

[0034] Specifically, refer to Figure 1-5 The positioning block includes a guide sleeve 1 and a positioning plate 2 which are detachably fixedly connected to each other, and the positioning block is provided with pin holes corresponding to the guide posts 3. The guide posts 3 are installed on the end of the positioning plate 2 away from the guide sleeve 1. The positioning plate 2 is provided with a through hole 21. The center hole 11 of the guide sleeve 1 is connected with the through hole 21 to form the connecting hole 4. The two limit slots 12 are located on the guide sleeve 1. The end of the guide sleeve 1 away from the positioning plate 2 forms the first end face. The positioning plate 2 is made of nylon, and the guide sleeve 1 can be made of stainless steel. Among them, the tail of the nylon pin is threaded and is directly screwed onto the positioning plate 2. The guide sleeve 1 is fixed to the other side of the positioning plate 2 by a hexagon socket screw. The end of the guide sleeve 1 away from the positioning plate 2 is connected to the eddy current probe guide tube.

[0035] Specifically, refer to Figure 1 , 2, 3, 6, each guide column 3 is provided with a step 31 or a boss in the middle thereof, and each guide column 3 is provided with a step surface 311 on the side away from the first end surface, the outer diameter of the step surface 311 is larger than the aperture of the heat exchange tube hole, and the distance between the step surface 311 and the end surface of the positioning plate 2 close to one end of the guide column 3 is not less than 5 mm, that is, there is a step 31 with a thickness of not less than 5 mm on the guide column 3. When in use, when both guide columns 3 are inserted into the heat exchange tube hole, due to the presence of the step 31 on the guide column 3, there is a gap of not less than 5 mm between the positioning plate 2 and the heat exchange plate, which is convenient for the operator to observe the position of the probe in real time from this gap, and the eddy current port signal collected after using the positioning tooling has good consistency.

[0036] In one embodiment, the limit slot 12 is in an inverted mountain shape, and the limit slot 12 also includes a fourth slot section and a fifth slot section that are connected to each other, the fourth slot section and the second slot section 122 are symmetrically arranged relative to the first slot section 121, the fifth slot section and the third slot section 123 are symmetrically arranged relative to the first slot section 121, and the first slot section 121, the fourth slot section, and the fifth slot section are connected in sequence. After the eddy current probe catheter is inserted into the guide sleeve 1, the protrusion on the eddy current probe catheter can be inserted into the third slot section 123 or the fifth slot section by left or right rotation, thereby fixing the eddy current probe catheter to the guide sleeve 1.

[0037] For other contents of the eddy current probe guide device described in the utility model, please refer to the prior art and will not be repeated here.

[0038] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Therefore, any modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An eddy current probe guide device, characterized in that: It comprises a positioning block, the positioning block is provided with a connecting hole and two guide pillars, the two ends of the connecting hole are respectively located at a first end face and a second end face oppositely arranged on the positioning block, the two guide pillars are convexly arranged on the second end face, each of the guide pillars is vertically arranged and parallel to the axis of the connecting hole; the diameter of the connecting hole is adapted to the outer diameter of the eddy current probe catheter, the connecting hole can be inserted into the eddy current probe catheter, the outer diameter of each of the guide pillars is adapted to the aperture of the heat exchange tube hole, and the spacing between the two guide pillars is adapted to the spacing between the two heat exchange tube holes; Two limiting slots with the same structure and completely connected with the connecting hole in the horizontal direction are arranged on the side of the positioning block, each of the limiting slots includes a first slot section, a second slot section and a third slot section which are connected in sequence, the first slot section is parallel to the axis of the connecting hole and connected with the first end face, the second slot section is arranged horizontally, and the third slot section has an angle with the horizontal plane and is located above the second slot section.

2. The eddy current probe guide device according to claim 1, characterized in that: The connecting hole is a stepped hole, and includes a first section and a second section that are interconnected. The first section is close to the first end face and has a larger aperture than the second section. The aperture of the first section is adapted to the outer diameter of the eddy current probe conduit, and the second section is capable of allowing the eddy current probe to pass through.

3. The eddy current probe guide device according to claim 1, characterized in that: A step surface is provided on one side of each guide column away from the first end surface, and the outer diameter of the step surface is larger than the aperture of the tube hole of the heat exchange tube.

4. The eddy current probe guide device according to claim 3, characterized in that: Each of the guide posts is a nylon pin.

5. The eddy current probe guide device according to claim 3, characterized in that: The positioning block includes a guide sleeve and a positioning plate which are detachably fixed to each other. The guide column is installed on one end of the positioning plate away from the guide sleeve. A through hole is provided on the positioning plate. The center hole of the guide sleeve is connected to the through hole to form the connecting hole. The two limit slots are located on the guide sleeve. The positioning plate is made of nylon.

6. The eddy current probe guide device according to claim 5, characterized in that: The distance between the step surface and the end surface of the positioning plate close to one end of the guide column is not less than 5 mm.

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