Universal threaded hole inner wall eddy current detection device and detection equipment

Abstract

The utility model discloses a universal threaded hole inner wall eddy current detection device and detection equipment, and the detection device comprises a detection member which comprises a detection tube and two detection heads which are connected with the front end of the detection tube through an elastic connection part; the two detection heads are symmetrically arranged in an open shape, and are provided with semispherical detection surfaces which are opposite to each other; the elastic connecting part is configured to be suitable for applying force to the two detection heads when the two detection heads are stressed and get close to each other, so that the two detection heads have a trend of opening outwards; the eddy current assembly comprises an excitation coil, an induction coil and a plurality of current leads; the exploring tube and the exploring heads are hollow, and exciting coils and induction coils are arranged in the two exploring heads and are connected with current wires in the exploring tube; and the current lead in the exploring tube is suitable for being connected with an external power supply device and a signal processing device. The detection device can be used for detecting the defects of the inner walls of various threaded holes with different inner diameters.

Description

Technical Field

[0001] The utility model relates to the technical field of eddy current detection, in particular to a universal threaded hole inner wall eddy current detection device and detection equipment. Background Art

[0002] With the rise of my country's wind power industry and advancements in processing technology, quality requirements for wind turbine ferrules are becoming increasingly stringent. The threaded hole in the ferrule is the primary stress-bearing area for alternating loads. After the ferrule undergoes heat treatment, threaded holes are machined. While the carbide drill bit and the ferrule rotate at high speed relative to each other, the intense friction between them inevitably generates significant heat, causing localized secondary heat treatment of the material structure. This negatively impacts material performance, most notably through the generation of thermal cracks, which are invisible due to the limited space. Furthermore, debris within the ferrule can affect endoscopic evaluation. Eddy current testing is commonly used to inspect the inner wall of the threaded hole.

[0003] Eddy current testing is a nondestructive testing method that uses the electromagnetic effect of eddy currents induced in conductive materials by an alternating magnetic field to evaluate the workpiece under test. Eddy current testing technology is one of the longest-used nondestructive testing methods, primarily used for quality inspection of raw materials such as pipes, bars, and plates, as well as equipment such as blades, bolts, and nuts. It primarily detects surface and near-surface defects in conductive materials. Eddy current testing has a wide range of applications and high reliability. Its principle is based on electromagnetic induction. By measuring changes in the impedance of the detection coil, changes in the induced eddy currents within the workpiece under test are detected, and the performance of the test piece or the presence of defects can be evaluated.

[0004] At present, when the eddy current detection device detects the inner wall of the threaded hole, the probe size must be adapted to the inner diameter of the threaded hole so that the probe can contact the inner wall of the threaded hole. When detecting threaded holes with different inner diameters, multiple probes of corresponding specifications need to be customized, resulting in increased production costs. Utility Model Content

[0005] The purpose of the present invention is to overcome the above-mentioned defects or problems existing in the background technology and to provide an eddy current detection device and detection equipment for the inner wall of a threaded hole, which can detect defects on the inner wall of a plurality of threaded holes with different inner diameters.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] Technical Solution 1: A universal eddy current detection device for the inner wall of a threaded hole, which is suitable for connecting to an external power supply device and a signal processing device and performing eddy current detection on the inner wall of the threaded hole, comprising: a detection part, which includes a probe tube and two detection heads connected to the front end of the probe tube by an elastic connection part; the two detection heads are symmetrically arranged and open, and are both provided with detection surfaces that are opposite to each other and are hemispherical; the elastic connection part is configured to be suitable for applying force to the two detection heads when the two detection heads are subjected to force and approach each other so that the two detection heads have a tendency to open outward; an eddy current assembly, which includes an excitation coil, an induction coil and a plurality of current conductors; the probe tube and the detection head are hollow inside, and the two detection heads are provided with an excitation coil and an induction coil, and are connected to the current conductor in the probe tube; the current conductor in the probe tube is suitable for connecting to an external power supply device and a signal processing device.

[0008] Technical solution 2 based on technical solution 1: the elastic connecting part is made of elastic material, and one end of the elastic connecting part is connected to the front end of the probe tube, and the other end is forked to form a first arm and a second arm and are respectively connected to the two detection heads.

[0009] Technical solution three based on technical solution two: the probe tube, elastic connecting portion and detection head are made of elastic resin and / or metal material.

[0010] Technical solution 4 based on technical solution 3: the elastic connecting portion includes two torsion springs, one end of the two torsion springs is fixedly connected to the probe tube, and the other end is forked and fixedly connected to the two detection heads respectively.

[0011] Technical solution five based on technical solution four: the detection member also includes a fixing rod, the fixing rod is fixedly connected to the front end of the probe tube, and the two torsion springs are sleeved on the fixing rod.

[0012] Technical solution 6 based on any one of technical solutions 1 to 5: the detection head is made of polyurethane, nylon, polytetrafluoroethylene or polyethylene.

[0013] Technical solution seven based on any one of technical solutions one to five: also includes a driving assembly, which includes a first driving member and a second driving member; the output end of the first driving member is fixedly connected to the second driving member, and is suitable for driving the second driving member to perform linear reciprocating motion along the first direction; the output end of the second driving member is fixedly connected to the detection member, and is suitable for driving the detection member to rotate around the axis of the first direction.

[0014] Technical solution eight based on technical solution seven: also includes a base, and the first driving member is fixedly installed on the base.

[0015] Technical solution nine based on technical solution eight: the first driving member is a pneumatic cylinder or an electric cylinder, and the second driving member is a servo motor.

[0016] In addition, the utility model also provides technical solution ten: a universal threaded hole inner wall eddy current detection device, which includes a power supply device and a signal processing device, which includes a universal threaded hole inner wall eddy current detection device as described in any one of technical solutions one to nine, and the eddy current component of the detection device is electrically connected to the power supply device and sends an induction signal to the signal processing device.

[0017] From the above description of the present invention, it can be seen that compared with the prior art, the present invention has the following beneficial effects:

[0018] Technical solution 1 provides a universal eddy current detection device for the inner wall of a threaded hole, which mainly includes a detection part and an eddy current assembly, wherein the detection part includes a probe tube and two detection heads connected to the front end of the probe tube by an elastic connection part, an excitation coil and an induction coil are arranged inside the two detection heads, and a hemispherical detection surface is provided; through the elastic connection part, the two detection heads are opened, and the elastic connection part can be deformed. When the detection device is used for detection, according to the inner diameter of the threaded hole, force is applied to the two detection heads to make them approach each other, and after the two detection heads can be inserted into the threaded hole, the detection heads are loosened, and under the action of the elastic connection part, the detection heads are opened outward, and the detection surface is pressed against the inner wall of the threaded hole, and then the detection part is made to perform a spiral motion, so that the detection head rotates and penetrates into the inside of the threaded hole, realizing an all-round sweep of the inner wall of the threaded hole, thereby completing the defect detection of the inner wall of the threaded hole;

[0019] The detection device uses an open detection head and an elastic connecting part. When facing threaded holes with different inner diameters, the detection head can be opened outward to fit tightly against the inner wall of the threaded hole, thereby achieving detection adaptation for threaded holes with different inner diameters. Only one or a small number of detection parts of one specification are needed to detect defects on the inner walls of threaded holes with various inner diameters, greatly reducing the detection cost. In addition, the device is divided into two detection heads, and an excitation coil and an induction coil are provided in both detection heads. The two detection heads can perform eddy current detection separately, further improving the accuracy of defect detection on the inner wall of the threaded hole.

[0020] In technical solution two, the elastic connecting part is made of elastic material, and is connected to the two detection heads through the forked first arm and the second arm, so that the two detection heads are in an open state, and force can be applied to the detection head after the detection head enters the threaded hole, so that the detection surface of the detection head is close to the inner wall of the threaded hole.

[0021] In technical solution three, the probe tube, elastic connection part and detection head are all made of elastic materials, which can provide greater deformation freedom. When the detection part is difficult to extend into the inner wall of the threaded hole, it can also complete the defect detection of the inner wall of the threaded hole through its own deformation.

[0022] In technical solution four, the elastic connection part includes a torsion spring, which applies force to the detection head so that it is close to the inner wall of the threaded hole. The structure is simple and reliable, and the production cost is lower.

[0023] In technical solution five, a fixing rod is provided on the detection member so that the axis of the torsion spring can be fixed by the fixing rod.

[0024] In technical solution six, the detection head is made of wear-resistant material, which can increase the service life of the detection head and reduce the detection error caused by wear of the detection surface of the detection head.

[0025] In technical solution seven, a driving component is provided to automatically drive the detection member to perform spiral motion through the driving component, which is beneficial to controlling the spiral motion of the detection member, making the travel speed more stable, and helping to improve the accuracy of the defect detection results.

[0026] In technical solution eight, a base is provided to provide the driving assembly with a positioning reference so that the detection member will not shift or deviate during movement.

[0027] In technical solution nine, the first driving member adopts a pneumatic cylinder or an electric cylinder to facilitate the control of the linear motion of the second driving member. The second driving member is a servo motor, which can accurately control the rotation rate of the detection member.

[0028] In technical solution ten, a universal eddy current detection device for the inner wall of a threaded hole is provided, which adopts the above-mentioned detection device and has the advantages of good versatility and high detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A schematic structural diagram of a universal threaded hole inner wall eddy current detection device provided in Example 1 of the present utility model;

[0031] Figure 2 for Figure 1 Schematic diagram of the detection status of the detection component;

[0032] Figure 3 for Figure 2 Schematic diagram of the structure of the detection component.

[0033] Description of main reference numerals:

[0034] Detection member 1; probe tube 2; elastic connecting portion 3; detection head 4; detection surface 5; eddy current assembly 6; excitation coil 7; induction coil 8; current conductor 9; first arm 10; second arm 11; drive assembly 12; first drive member 13; second drive member 14; base 15; collar 16; threaded hole 17. DETAILED DESCRIPTION

[0035] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are preferred embodiments of the present invention and should not be regarded as excluding other embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0036] In the claims, description and the above-mentioned drawings of the present utility model, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" is to distinguish different objects rather than to describe a specific order.

[0037] In the claims, specification and the above-mentioned drawings of the present utility model, unless otherwise expressly defined, directional words, such as the terms "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise" and the like, indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific protection scope of the present utility model.

[0038] In the claims, specification and the above drawings of the present utility model, unless otherwise clearly defined, if the terms "fixed connection" or "fixed connection" are used, they should be understood in a broad sense, that is, any connection method without any displacement relationship and relative rotation relationship between the two parties, that is to say, including non-detachable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or elements.

[0039] In the claims, description and drawings of the present utility model, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0040] Example 1

[0041] The embodiment of the present utility model provides a universal eddy current detection device for the inner wall of a threaded hole, which is suitable for connecting with an external power supply device and a signal processing device and performing eddy current detection on the inner wall of the threaded hole 17. Figure 1 and Figure 2 The detection device mainly includes a detection component 1, an eddy current component 6 and a driving component 12.

[0042] In this embodiment, the detection device is used to detect defects on the inner wall of the threaded hole 17 on the ring 16. The inner wall of the threaded hole 17 has internal threads, and the detection device needs to extend into the threaded hole 17 and rest against the inner wall of the threaded hole 17 to perform eddy current detection on the defects on the inner wall of the threaded hole 17.

[0043] Reference Figure 2 and Figure 3 The detection member 1 includes a probe tube 2 and two detection heads 4 connected to the front end of the probe tube 2 via an elastic connection 3. The two detection heads 4 are symmetrically arranged and open, and each has a hemispherical detection surface 5 that is separated from each other. The elastic connection 3 is configured to apply force to the two detection heads 4 so that the two detection heads 4 have a tendency to open outward when the two detection heads 4 are forced to move closer to each other. The eddy current assembly 6 includes an excitation coil 7, an induction coil 8, and a plurality of current conductors 9. The probe tube 2 and detection heads 4 are hollow inside. The excitation coil 7 and induction coil 8 are installed in each of the detection heads 4 and are connected to the current conductors 9 in the probe tube 2. The current conductors 9 in the probe tube 2 are suitable for connecting to an external power supply device and a signal processing device.

[0044] In this embodiment, the elastic connecting portion 3 is made of elastic material, and one end of the elastic connecting portion 3 is connected to the front end of the probe 2, and the other end is forked to form a first arm 10 and a second arm 11 and respectively connected to the two detection heads 4.

[0045] Reference Figure 2 and Figure 3 The probe 1 is used to extend into the interior of the threaded hole 17, so the probe 1 is in the shape of an elongated strip as a whole. The main body of the probe 1 is a probe tube 2, which is suitable for hand-holding or can be installed and matched with the drive assembly 12. The probe tube 2 is hollow inside and has an opening at the top. The current conductor 9 of the eddy current assembly 6 can extend from the opening at the top of the probe tube 2. The lower end of the probe tube 2, that is, the front end of the probe tube 2, is provided with an elastic connecting portion 3. The elastic connecting portion 3 can be regarded as consisting of two parts. The part close to the probe tube 2 is connected to the probe tube 2, and the part close to the detection head 4 is forked to form a first arm 10 and a second arm 11, and then connected to a detection head 4 through the first arm 10 and the second arm 11 respectively.

[0046] The elastic connection portion 3 is made of an elastic material, which can be a resin material or a metal material. In this embodiment, a resin material is used. It should be noted that resin materials in the prior art generally have good elasticity, but in this embodiment, the elastic connection portion 3 not only needs to be elastic but also needs to have sufficient structural rigidity to provide sufficient reaction force when deformed by force. Therefore, the elastic connection portion 3 can be made of engineering plastics, etc. In addition, the elastic connection portion 3 can deform due to its own material properties and the forked design of the first and second arms 10, 11, which creates a clearance space between the first and second arms 10, 11. When the elastic connection portion 3 is subjected to an inward force, the first and second arms 10, 11 move closer to each other relative to the upper end of the elastic connection portion 3, occupying the clearance space originally between them. This also reduces the degree of outward expansion of the probe head 4, allowing the probe head 4 to extend into the threaded hole 17 of the corresponding inner diameter. After the detection head 4 is extended into the threaded hole 17, the force applied to the first arm 10 and the second arm 11 can be released, and the first arm 10 and the second arm 11 tend to return to their original positions, thereby driving the two detection heads 4 to open to both sides, and the detection head 4 is limited by the inner wall of the threaded hole 17, so that the detection surface 5 on the outside of the detection head 4 can be tightly attached to the inner wall of the threaded hole 17.

[0047] Reference Figure 3 The two detection heads 4 are symmetrically arranged and open. A hemispherical detection surface 5 is formed on the opposite side of the two detection heads 4. The detection surface 5 is designed to abut against the inner wall of the threaded hole 17. The detection heads 4 are hollow and communicate with the interior of the probe tube 2 through a hollow elastic connection 3. Each detection head 4 is equipped with an excitation coil 7 and an induction coil 8. The excitation coil 7 is electrically connected to an external AC power supply via a current conductor 9 to form an alternating magnetic field. The induction coil 8 is used to sense the induced magnetic field and transmit the induced signal to an external signal processing device via the current conductor 9.

[0048] In this embodiment, the probe tube 2, elastic connector 3, and probe head 4 are all made of elastic resin and / or metal. This provides greater freedom of deformation. Even when the probe 1 has difficulty inserting into the inner wall of the threaded hole 17, it can still detect defects on the inner wall of the threaded hole 17 through its own deformation.

[0049] The probe head 4 is made of polyurethane, nylon, polytetrafluoroethylene, or polyethylene. During the detection process, the probe head 4 must be in close contact with the inner wall of the threaded hole 17. The inner wall of the threaded hole 17 has internal threads. When the probe head 4 passes over the crests of these internal threads, these crests can easily damage the detection surface 5 of the probe head 4. Therefore, in this embodiment, the probe head 4 can be made of the aforementioned materials, all of which have excellent wear resistance, significantly extending the service life of the probe head 4 and reducing detection errors caused by wear of the detection surface 5 of the probe head 4.

[0050] Reference Figure 1 The drive assembly 12 includes a first drive member 13, a second drive member 14, and a base 15. The output end of the first drive member 13 is fixedly connected to the second drive member 14 and is suitable for driving the second drive member 14 to perform linear reciprocating motion along a first direction. The output end of the second drive member 14 is fixedly connected to the detection member 1 and is suitable for driving the detection member 1 to rotate about an axis in the first direction. The first drive member 13 is fixedly mounted on the base 15.

[0051] The first driving member 13 is a pneumatic cylinder or an electric cylinder, and the second driving member 14 is a servo motor.

[0052] Specifically, refer to Figure 1 The base 15 can be placed on a workbench for fixing. The base 15 includes a straight rod and a crossbar, and the first driving member 13 can be fixedly mounted on the crossbar. When in use, the base 15 can be fixed near the ring 16 to be tested, and then the first driving member 13 can be adjusted to be just above the ring 16.

[0053] The first drive member 13 is a pneumatic or electric cylinder having an output shaft capable of linear reciprocating motion. The second drive member 14 is mounted on the output shaft of the first drive member 13. In this embodiment, the direction of motion of the output shaft of the first drive member 13 is a first direction. Typically, the first direction is a vertical direction because, when the ferrule 16 is placed on a workbench, its threaded hole 17 is generally open upward. Of course, in other cases, such as when the threaded hole 17 on the ferrule 16 opens horizontally, the first direction is also horizontal. Obviously, the direction of motion of the output shaft of the first drive member 13 is adjusted according to the direction of the opening of the threaded hole 17 on the ferrule 16.

[0054] The second drive member 14 is a servo motor having a rotational output shaft. The detector 1 is mounted on the output shaft of the second drive member 14, and the output shaft of the second drive member 14 rotates about an axis of rotation in a first direction. The second drive member 14, in conjunction with the first drive member 13, causes the detector 1 to perform a spiral motion, that is, to move linearly within the threaded hole 17 while rotating. This spiral motion of the detector 1 allows the probe head 4 to sweep across the inner wall of the threaded hole 17 and adapt to the angle of the internal threads of the threaded hole 17, thereby improving the accuracy of defect detection on the inner wall of the threaded hole 17.

[0055] The present embodiment provides a universal eddy current detection device for the inner wall of a threaded hole, which mainly includes a detection member 1 and an eddy current assembly 6, wherein the detection member 1 includes a probe tube 2 and two detection heads 4 connected to the front end of the probe tube 2 by an elastic connection part 3, an excitation coil 7 and an induction coil 8 are provided inside the two detection heads 4, and a hemispherical detection surface 5 is provided; through the elastic connection part 3, the two detection heads 4 are in an open shape, and the elastic connection part 3 can be deformed. When the detection device is used for detection, according to the inner diameter of the threaded hole 17, a force is applied to the two detection heads 4 to make them approach each other. After the two detection heads 4 can be inserted into the threaded hole 17, the detection heads 4 are loosened. Under the action of the elastic connection part 3, the detection heads 4 are opened outward, and the detection surface 5 presses against the inner wall of the threaded hole 17, and then the detection member 1 is made to perform a spiral motion. The detection head 4 is rotated to penetrate into the threaded hole 17 to achieve an all-round sweep of the inner wall of the threaded hole 17, thereby completing the defect detection of the inner wall of the threaded hole 17; the detection device uses the opened detection head 4 and the elastic connecting part 3 with elasticity. When facing threaded holes 17 with different inner diameters, the detection head 4 can be opened outward to fit tightly against the inner wall of the threaded hole 17, thereby achieving detection adaptation for threaded holes 17 with different inner diameters. Only one specification or a small number of detection parts 1 are needed to perform defect detection on the inner walls of threaded holes 17 with multiple different inner diameters, which greatly reduces the detection cost; and, it is divided into two detection heads 4, and an excitation coil 7 and an induction coil 8 are set in both detection heads 4, which can perform eddy current detection separately, further improving the accuracy of defect detection on the inner wall of the threaded hole 17.

[0056] Example 2

[0057] The difference between Example 2 of the present invention and Example 1 is that the structure of the detection member 1 is different.

[0058] In this embodiment, the elastic connecting portion 3 includes two torsion springs, one end of which is fixedly connected to the probe tube 2, and the other end of which is forked and fixedly connected to the two detection heads 4. The detection member 1 also includes a fixing rod, which is fixedly connected to the front end of the probe tube 2, and the two torsion springs are mounted on the fixing rod.

[0059] Specifically, a detachable fixing rod is fixed to the front end of the probe 2. The axial direction of the fixing rod is perpendicular to the extension direction of the probe 2, and two torsion springs are both mounted on the fixing rod. The torsion spring mainly consists of a spiral spring coil and two force-bearing arms extending from the two ends of the spring coil. In this embodiment, the force-bearing arms on the same side of the two torsion springs are fixedly connected to the front end of the probe 2, and the force-bearing arms on the other side are located below the probe 2 and are forked, that is, the two force-bearing arms point to opposite sides. The two detection heads 4 are fixedly mounted on the force-bearing arms below the two torsion springs, so that the two detection heads 4 can be subjected to the elastic force of the torsion springs.

[0060] During use, as in the embodiment, an inward force is applied to the two detection heads 4 to bring the two detection heads 4 closer to each other. At this time, both torsion springs produce elastic deformation and store elastic potential energy. Then, the two detection heads 4 enter the threaded hole 17. After loosening the two detection heads 4, under the action of the torsion springs, the detection surfaces 5 of the two detection heads 4 are tightly attached to the inner wall of the threaded hole 17.

[0061] Example 3

[0062] Example 3 of the present utility model provides a universal eddy current detection device for the inner wall of a threaded hole, which includes a power supply device, a signal processing device and a universal eddy current detection device for the inner wall of a threaded hole as described in Example 1 or 2. The eddy current component 6 of the detection device is electrically connected to the power supply device and sends an induction signal to the signal processing device.

[0063] The universal threaded hole inner wall eddy current detection device has the advantages of good versatility and high detection accuracy due to the adoption of the above-mentioned detection device.

[0064] The above description and embodiments are used to explain the scope of protection of the utility model, but do not constitute a limitation on the scope of protection of the utility model. Based on the enlightenment of the utility model or the above embodiments, modifications, equivalent replacements, or other improvements to the embodiments of the utility model or part of the technical features thereof that can be obtained by ordinary technicians in this field through logical analysis, reasoning, or limited experiments in combination with common knowledge, ordinary technical knowledge in this field and / or existing technology should be included in the scope of protection of the utility model.

Claims

1. A universal eddy current detection device for the inner wall of a threaded hole, which is suitable for connecting with an external power supply device and a signal processing device and performing eddy current detection on the inner wall of a threaded hole (17), wherein: include: A detection member (1) comprises a probe tube (2) and two detection heads (4) connected to the front end of the probe tube (2) via an elastic connection portion (3); the two detection heads (4) are symmetrically arranged and open, and both are provided with detection surfaces (5) that are separated from each other and are hemispherical; the elastic connection portion (3) is configured to apply force to the two detection heads (4) when the two detection heads (4) are subjected to force and approach each other, so that the two detection heads (4) have a tendency to open outwards; An eddy current assembly (6) includes an excitation coil (7), an induction coil (8) and a plurality of current conductors (9); the interiors of the probe tube (2) and the detection head (4) are hollow, and the excitation coil (7) and the induction coil (8) are both provided in the two detection heads (4) and are connected to the current conductors (9) in the probe tube (2); the current conductors (9) in the probe tube (2) are suitable for connection to an external power supply device and a signal processing device.

2. A universal threaded hole inner wall eddy current detection device according to claim 1, characterized in that: The elastic connecting portion (3) is made of an elastic material, and one end of the elastic connecting portion (3) is connected to the front end of the probe (2), and the other end is bifurcated to form a first arm (10) and a second arm (11) and respectively connected to the two detection heads (4).

3. A universal threaded hole inner wall eddy current detection device as claimed in claim 2, characterized in that: The probe tube (2), the elastic connecting portion (3) and the detection head (4) are made of elastic resin and / or metal material.

4. A universal threaded hole inner wall eddy current detection device according to claim 1, characterized in that: The elastic connection part (3) comprises two torsion springs, one end of the two torsion springs is fixedly connected to the probe tube (2), and the other end is forked and fixedly connected to the two detection heads (4) respectively.

5. A universal threaded hole inner wall eddy current detection device as claimed in claim 4, characterized in that: The detection member (1) further comprises a fixing rod, the fixing rod being fixedly connected to the front end of the probe tube (2), and the two torsion springs being sleeved on the fixing rod.

6. A universal eddy current detection device for inner wall of threaded hole according to any one of claims 1 to 5, characterized in that: The detection head (4) is made of polyurethane, nylon, polytetrafluoroethylene or polyethylene.

7. A universal threaded hole inner wall eddy current detection device according to any one of claims 1 to 5, characterized in that: The invention also includes a driving assembly (12), which includes a first driving member (13) and a second driving member (14); the output end of the first driving member (13) is fixedly connected to the second driving member (14) and is suitable for driving the second driving member (14) to perform linear reciprocating motion along a first direction; the output end of the second driving member (14) is fixedly connected to the detection member (1) and is suitable for driving the detection member (1) to rotate around the axis of the first direction.

8. A universal threaded hole inner wall eddy current detection device according to claim 7, characterized in that: It also includes a base (15), and the first driving member (13) is fixedly mounted on the base (15).

9. A universal eddy current detection device for inner wall of threaded hole according to claim 8, characterized in that: The first driving member (13) is a pneumatic cylinder or an electric cylinder, and the second driving member (14) is a servo motor.

10. A universal eddy current detection device for the inner wall of a threaded hole, comprising a power supply device and a signal processing device, characterized in that: It also includes a universal threaded hole inner wall eddy current detection device according to any one of claims 1 to 9, wherein the eddy current component (6) of the detection device is electrically connected to the power supply device and sends an induction signal to the signal processing device.

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