A nuclear power fastener surface crack eddy current detection probe positioning mechanism

Abstract

The utility model belongs to eddy current detection probe positioning technical field discloses a kind of nuclear power fastener surface crack eddy current detection probe positioning mechanism, including base, detachably installed magnetic base on base, the top of magnetic base is equipped with vertical guide pillar;Adjusting structure, adjusting structure includes adjusting block, and hand screw knob is threadedly cooperated and connected on adjusting block, and adjusting block is installed on vertical guide pillar by hand screw knob;Angle adjusting disc, angle adjusting disc is installed on adjusting block by bearing, and angle adjusting disc is equipped with a plurality of second positioning hole;Probe clamping mechanism, probe clamping mechanism includes the universal joint of second positioning hole cooperation connection, the other end of universal joint is equipped with eddy current probe clamp, and pre-tightening spring is sleeved in the junction of universal joint and eddy current probe clamp, and magnetic base uses Nd-Fe-B permanent magnet. Probe and curved surface self-adapting fit are realized by eddy current probe clamp, pre-tightening spring and universal joint linkage mechanism, and do not need manual intervention.

Description

Technical Field

[0001] This utility model relates to the field of eddy current detection probe positioning technology, and in particular to a positioning mechanism for an eddy current detection probe for surface cracks in nuclear power fasteners. Background Technology

[0002] The positioning mechanism for eddy current detection probes for surface cracks in nuclear power fasteners refers to an automated mechanical device used for detecting surface cracks in critical fasteners of nuclear power equipment. Its core function is to precisely control the spatial position and movement trajectory of the eddy current probe to ensure the stability and accuracy of the detection.

[0003] Nuclear power plant fasteners (such as bolts and nuts) are prone to surface microcracks under long-term high stress and radiation environments. Traditional eddy current testing requires manual positioning of the probe, which has the following problems:

[0004] 1) Low positioning accuracy: Manual operation can easily lead to uneven contact between the probe and the curved surface, resulting in a high rate of missed detections;

[0005] 2) Low efficiency: The probe angle needs to be adjusted repeatedly, especially for irregularly shaped fasteners (such as hexagonal head bolts);

[0006] 3) Poor safety: The nuclear power environment requires minimal human intervention. Therefore, we propose a positioning mechanism for a nuclear power fastener surface crack eddy current detection probe. Utility Model Content

[0007] In view of the problems of low positioning accuracy, low efficiency and poor safety of the existing eddy current detection probe positioning device, this utility model is proposed.

[0008] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0009] A positioning mechanism for a surface crack eddy current detection probe for nuclear power fasteners includes a base, on which a magnetic base is detachably mounted, and a vertical guide post is mounted on the top of the magnetic base.

[0010] An adjustment structure is provided, comprising an adjustment block mounted on the outer surface of the vertical guide post, wherein a hand-tightening knob is threadedly connected to the adjustment block, and the adjustment block is mounted on the vertical guide post via the hand-tightening knob.

[0011] An angle adjustment disc is mounted on the adjustment block via a bearing, and the angle adjustment disc is provided with a plurality of second positioning holes spaced at 5° intervals.

[0012] The probe clamping mechanism includes a universal joint that mates with the second positioning hole, and an eddy current probe clamp is mounted on the other end of the universal joint. A preload spring is sleeved at the connection between the universal joint and the eddy current probe clamp.

[0013] As a technical solution of the positioning mechanism for the eddy current detection probe for surface cracks in nuclear power fasteners described in this utility model, the magnetic base adopts a neodymium iron boron permanent magnet, and a rubber buffer layer is embedded in the bottom of the magnetic base.

[0014] As a technical solution of the positioning mechanism for the eddy current detection probe for surface cracks in nuclear power fasteners according to this utility model, wherein: a magnetic column is installed at the bottom corner of the rubber buffer layer, and a first positioning hole corresponding to the magnetic column is opened on the top of the base, and the first positioning hole is adapted to the magnetic column and magnetically fixed in the first positioning hole, and the magnetic base is detachably installed on the base through the magnetic column and the first positioning hole.

[0015] As a technical solution of the positioning mechanism for the eddy current detection probe for surface cracks in nuclear power fasteners described in this utility model, the vertical guide post is provided with a scale on its side with an accuracy of 0.5mm.

[0016] As a technical solution of the positioning mechanism for the eddy current detection probe for surface cracks in nuclear power fasteners according to this utility model, the vertical guide post has a sliding groove on the side away from the scale, the adjusting block has a sleeve groove adapted to the vertical guide post, the inner wall of the sleeve groove has an integrally formed slider corresponding to the sliding groove, and the slider is adapted to the sliding groove, and the adjusting block is slidably installed on the vertical guide post through the sleeve groove, the slider and the sliding groove.

[0017] As a technical solution of the positioning mechanism for the eddy current detection probe for surface cracks in nuclear power fasteners described in this utility model, wherein: a plurality of second positioning holes are radially distributed, and the distance between the centers of adjacent holes is 3mm.

[0018] As a technical solution of the positioning mechanism for the eddy current detection probe for surface cracks in nuclear power fasteners described in this utility model, the universal joint has a deflection angle of ±15° and is provided with a polytetrafluoroethylene wear-resistant bushing at its joint.

[0019] As a technical solution of the eddy current detection probe positioning mechanism for surface cracks in nuclear power fasteners described in this utility model, the eddy current probe clamp is a three-jaw self-centering structure, the elastic coefficient of the pre-tension spring is 8N / mm, and the maximum compression stroke is 10mm.

[0020] Compared with the prior art, the present invention has at least the following beneficial effects:

[0021] 1. This utility model achieves adaptive fitting of the probe to the curved surface through an eddy current probe clamp, a pre-tightening spring, and a universal joint linkage mechanism, without the need for manual intervention.

[0022] 2. This utility model, through the coordinated design of the scale on the vertical guide post, the angle adjustment disk, and the universal joint, can achieve three-dimensional precision adjustment of height, angle, and direction, and at the same time meet the full coverage detection requirements of complex surface cracks in nuclear power fasteners.

[0023] 3. The combination of neodymium iron boron magnetic base, rubber buffer layer and first positioning hole of magnetic column in this utility model can not only ensure strong adsorption stability, but also realize quick disassembly and surface protection, and is suitable for nuclear power equipment in confined spaces or high-altitude operation scenarios.

[0024] 4. The design of this utility model, including a PTFE wear-resistant bushing, an elastic preload spring, and a three-jaw self-centering clamp, can reduce the wear rate of key components and is compatible with probes of different sizes, thereby reducing maintenance frequency and improving detection efficiency. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0026] Figure 1 This is a schematic diagram of the overall main structure of this utility model.

[0027] Figure 2 This is a schematic side view of the overall structure of this utility model.

[0028] Figure 3 This is a schematic diagram of the exploded main view structure of this utility model.

[0029] Figure 4 This is a side view diagram of the exploded structure of this utility model.

[0030] Explanation of reference numerals in the attached figures:

[0031] In the diagram: 1. Base; 101. Magnetic base; 1011. Rubber buffer layer; 1012. Magnetic column; 102. Vertical guide column; 1021. Scale graduations; 1022. Slide groove; 103. First positioning hole; 2. Adjusting block; 201. Sleeve groove; 202. Slider; 3. Hand-tightening knob; 4. Angle adjustment disc; 401. Second positioning hole; 51. Universal joint; 501. PTFE wear-resistant bushing; 52. Eddy current probe clamp; 53. Preload spring. Detailed Implementation

[0032] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0033] Reference Figures 1-4 A positioning mechanism for a nuclear power fastener surface crack eddy current detection probe is provided. This positioning mechanism includes a base 1, a magnetic base 101 detachably mounted on the base 1, and a vertical guide post 102 mounted on the top of the magnetic base 101.

[0034] The adjustment structure includes an adjustment block 2 installed on the outer surface of the vertical guide post 102. A hand-tightening knob 3 is threadedly connected to the adjustment block 2, and the adjustment block 2 is installed on the vertical guide post 102 through the hand-tightening knob 3.

[0035] Angle adjustment disc 4 is mounted on adjustment block 2 via bearings. Angle adjustment disc 4 is provided with a number of second positioning holes 401 spaced at 5° intervals.

[0036] The probe clamping mechanism includes a universal joint 51 that mates with the second positioning hole 401. An eddy current probe clamp 52 is mounted on the other end of the universal joint 51. A pre-tensioning spring 53 is sleeved at the connection between the universal joint 51 and the eddy current probe clamp 52. In application, the combination of the magnetic base 101, the vertical guide post 102 and the angle adjustment disk 4 enables multi-dimensional adjustment of the probe (height, angle and direction) to meet the needs of complex surface crack detection. At the same time, the detachable design of the base 1 makes it easy to carry and install.

[0037] Reference Figures 1-3 The magnetic base 101 uses neodymium iron boron permanent magnets. A rubber buffer layer 1011 is embedded in the bottom of the magnetic base 101. In application, the neodymium iron boron permanent magnets provide strong adsorption force to ensure the stability of the device. The rubber buffer layer 1011 can not only avoid direct friction damage between the magnetic base 101 and the workpiece surface, but also enhance the anti-slip performance.

[0038] Reference Figures 1-3 A magnetic post 1012 is installed at the bottom corner of the rubber buffer layer 1011. The top of the base 1 is provided with a first positioning hole 103 corresponding to the magnetic post 1012. The first positioning hole 103 is adapted to the magnetic post 1012 and is magnetically fixed in the first positioning hole 103. The magnetic base 101 is detachably installed on the base 1 through the magnetic post 1012 and the first positioning hole 103. In application, the magnetic attraction design of the magnetic post 1012 and the first positioning hole 103 improves the installation accuracy and disassembly efficiency of the magnetic base 101, while reducing mechanical wear and extending its service life.

[0039] ReferenceFigure 1 and Figure 3 The vertical guide post 102 has a scale 1021 on its side with an accuracy of 0.5mm. In application, the accuracy of the scale 1021 is 0.5mm, which can realize quantitative control of height adjustment to ensure the consistency of the distance between the probe and the detection surface, and at the same time improve the repeatability of the detection results.

[0040] Reference Figure 1 , Figure 2 as well as Figure 4 A groove 1022 is provided on the side of the vertical guide post 102 away from the scale 1021. A sleeve groove 201 adapted to the vertical guide post 102 is provided in the adjusting block 2. The inner wall of the sleeve groove 201 has an integrally formed slider 202 corresponding to the groove 1022, and the slider 202 is adapted to the groove 1022. The adjusting block 2 is slidably installed on the vertical guide post 102 through the sleeve groove 201, the slider 202 and the groove 1022. In application, the cooperation structure of the groove 1022 and the slider 202 ensures that the adjusting block 2 slides smoothly along the vertical guide post 102 and restricts the horizontal rotational freedom, avoiding detection errors caused by accidental probe displacement.

[0041] Reference Figure 1 and Figure 3 Several second positioning holes 401 are radially distributed, and the center of adjacent holes is 3mm apart. In application, the 3mm center-to-center distance of the radial second positioning holes 401 can provide fine angle adjustment (5° interval), which can cover more crack direction possibilities and improve the comprehensiveness of detection.

[0042] Reference Figures 1-4 The universal joint 51 has a deflection angle of ±15°, and its joint is provided with a polytetrafluoroethylene wear-resistant bushing 501. In application, the ±15° deflection range of the universal joint 51, combined with the polytetrafluoroethylene wear-resistant bushing 501, balances flexibility and durability, adapts to the detection of curved or inclined surfaces, and reduces maintenance costs caused by joint wear.

[0043] Reference Figures 1-4 The eddy current probe clamp 52 is a three-jaw self-centering structure. The elastic coefficient of the preload spring 53 is 8N / mm, and the maximum compression stroke is 10mm. In application, the three-jaw self-centering clamp, together with the elastic preload spring 53, can realize the rapid clamping of the probe and the clamping force is controllable, so as to avoid overload damage to the sensitive components of the probe.

[0044] The working principle of this utility model is as follows: The magnetic base 101 is installed by cooperating with the first positioning hole 103 through the magnetic column 1012. At the same time, it is fixed to the surface of the nuclear power fastener to be tested by strong magnetic adsorption. Then, the height is adjusted. At this time, the hand-tightening knob 3 is loosened, and the adjusting block 2 is slid along the vertical guide column 102 to the target height (precisely controlled by the scale 1021 with an accuracy of 0.5mm). The hand-tightening knob 3 is tightened to lock the position. The design of the slide groove 1022 and the slider 202 ensures the stability of vertical movement. Then, the angle and direction are adjusted. At this time, the angle adjustment disk 4 is rotated to the required detection direction. The positioning point is selected through the radial second positioning hole 401. The universal joint 51 is inserted to lock the angle. Its ±15° deflection range can be adapted to curved or inclined surfaces. Then, the probe is clamped and pre-tightened. At this time, the eddy current probe is installed into the eddy current probe clamp 52. The pre-tightening spring 53 automatically provides an elastic clamping force of 8N / mm to ensure that the contact pressure between the probe and the detection surface is uniform and to avoid overload damage. Thus, adaptive positioning can be achieved, while taking into account both accuracy and reliability.

[0045] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A positioning mechanism for an eddy current detection probe for surface cracks in nuclear power plant fasteners, characterized in that: include: A base (1) is provided, on which a magnetic base (101) is detachably mounted, and a vertical guide post (102) is mounted on the top of the magnetic base (101). The adjustment structure includes an adjustment block (2) installed on the outer surface of the vertical guide post (102), and a hand-tightening knob (3) is threadedly connected to the adjustment block (2), and the adjustment block (2) is installed on the vertical guide post (102) through the hand-tightening knob (3); Angle adjustment disk (4) is mounted on the adjustment block (2) by bearings. The angle adjustment disk (4) is provided with a plurality of second positioning holes (401) spaced at 5° intervals. The probe clamping mechanism includes a universal joint (51) that is connected to the second positioning hole (401). An eddy current probe clamp (52) is installed at the other end of the universal joint (51). A preload spring (53) is sleeved at the connection between the universal joint (51) and the eddy current probe clamp (52).

2. The positioning mechanism for the eddy current detection probe for surface cracks in nuclear power fasteners according to claim 1, characterized in that: The magnetic base (101) uses neodymium iron boron permanent magnets, and a rubber buffer layer (1011) is embedded in the bottom of the magnetic base (101).

3. The positioning mechanism for the eddy current detection probe for surface cracks in nuclear power fasteners according to claim 2, characterized in that: A magnetic post (1012) is installed at the bottom corner of the rubber buffer layer (1011). The top of the base (1) is provided with a first positioning hole (103) corresponding to the magnetic post (1012). The first positioning hole (103) is adapted to the magnetic post (1012) and is magnetically fixed in the first positioning hole (103). The magnetic base (101) is detachably installed on the base (1) through the magnetic post (1012) and the first positioning hole (103).

4. The positioning mechanism for the eddy current detection probe for surface cracks in nuclear power fasteners according to claim 1, characterized in that: The vertical guide post (102) has a scale (1021) on its side with an accuracy of 0.5 mm.

5. The positioning mechanism for the eddy current detection probe for surface cracks in nuclear power fasteners according to claim 4, characterized in that: The vertical guide post (102) has a groove (1022) on the side away from the scale (1021). The adjusting block (2) has a sleeve groove (201) that is adapted to the vertical guide post (102). The inner wall of the sleeve groove (201) has an integrally formed slider (202) that corresponds to the groove (1022). The slider (202) is adapted to the groove (1022). The adjusting block (2) is slidably mounted on the vertical guide post (102) through the sleeve groove (201), the slider (202) and the groove (1022).

6. The positioning mechanism for the eddy current detection probe for surface cracks in nuclear power fasteners according to claim 1, characterized in that: Several of the second positioning holes (401) are radially distributed, and the distance between the centers of adjacent holes is 3 mm.

7. The positioning mechanism for the eddy current detection probe for surface cracks in nuclear power fasteners according to claim 1, characterized in that: The universal joint (51) has a deflection angle of ±15° and is provided with a polytetrafluoroethylene wear-resistant bushing (501) at its joint.

8. The positioning mechanism for the eddy current detection probe for surface cracks in nuclear power fasteners according to claim 1, characterized in that: The eddy current probe clamp (52) is a three-jaw self-centering structure, and the elastic coefficient of the pre-tension spring (53) is 8N / mm, with a maximum compression stroke of 10mm.

Images