An ACFM crack detector with a modular probe structure

Abstract

This utility model relates to the field of crack detector technology, specifically disclosing an ACFM crack detector with a modular probe structure, including a detector body, a probe, a take-up structure, and an electrical transmission component. The detector body has a receiving cavity and a receiving groove connected to it, with the probe detachably housed within the receiving groove. The take-up structure includes a detection wire, a take-up roller, and a spiral spring, enabling automatic take-up and untake-up of the detection wire. The electrical transmission component consists of a static circuit component and a dynamic conductive component, forming a rotating electrical connection path to ensure stable signal transmission. The integrated design effectively solves the problem of chaotic probe and cable management, avoiding damage caused by cable entanglement and improper probe storage. The combination of the protective plate and the limiting ring prevents excessive winding of the detection wire, while the structure of the limiting plate and the pick-and-place slot makes probe pick-and-place more convenient and reliable, significantly improving detection efficiency and equipment portability, ensuring the accuracy of detection data and extending equipment lifespan.

Description

Technical Field

[0001] This utility model relates to the field of crack detector technology, specifically to an ACFM crack detector with a modular probe structure. Background Technology

[0002] ACFM (Alternating Current Electromagnetic Field) testing technology is an advanced electromagnetic non-destructive testing technology. It uses a probe to induce a uniform alternating current on the surface of a metal component and quantitatively detects cracks by measuring the electromagnetic field signal distorted by the presence of cracks. The ACFM tester, as the key equipment for implementing this technology, usually consists of three parts: a main unit, connecting cables, and an external probe.

[0003] In the prior art, such as the Chinese utility model patent with publication number CN220340111U, an ACFM digital detector is disclosed. This patent effectively improves the stability of the main unit and the convenience of adjusting the display screen angle through a suction cup, a round shaft and an adjustable length support rod structure, and solves the problem of adapting the device to different heights and viewing angles of different people.

[0004] However, this solution, as well as most ACFM testing equipment on the market, uses a separate design for the probe and the main unit. This leads to chaotic management of the probe and cables, which is not only cumbersome and prone to cable tangling and damage, posing safety hazards, but also lacks adequate protection for the probes. Precision probes are easily damaged by bumps or oil stains, or may cause poor contact. Ultimately, this reduces the overall testing efficiency. Every step from preparation to storage is time-consuming and labor-intensive, seriously affecting the on-site work experience. Utility Model Content

[0005] To address the technical problems in the prior art, this utility model provides an ACFM crack detector with a modular probe structure, aiming to solve the problems of chaotic probe and cable management, insufficient storage and protection, and the resulting low on-site testing efficiency and safety hazards in the prior art.

[0006] An ACFM crack detector with a modular probe structure includes a detector body, a probe, a take-up structure, and an electrical transmission assembly, wherein... The detector body has a receiving cavity, and one end of the detector body has a receiving groove that communicates with the receiving cavity. The probe is detachably mounted in the receiving slot; The take-up structure includes a detection line, a take-up roller, and a spiral spring; The take-up roller is horizontally disposed in the receiving cavity, and its two ends are rotatably connected to the side wall of the receiving cavity by pins. The detection line is wound onto the take-up roller. The spiral springs include two springs, which are located at the pins at both ends of the take-up roller on the side wall of the receiving cavity, and are used to drive the take-up roller to perform the take-up operation. The electrical transmission component includes a static circuit component and a dynamic conductive component; The static circuit assembly is located inside the receiving cavity and is electrically connected to the electronic control system inside the detector body. The dynamic conductive component is mounted on the take-up roller and rotates with it, forming a relatively rotating electrical connection path with the static circuit component; one end of the detection line is electrically connected to the dynamic conductive component, and the other end is detachably connected to the probe.

[0007] Optionally, the static circuit assembly includes a fixing plate, a conductive ring, and connecting wires, wherein, The fixing plate is fixed to the bottom of the receiving cavity and located on one side of the take-up roller. The fixing plate has a clearance hole at the pin shaft of the take-up roller. The conductive ring is located on the side of the fixed plate facing the take-up roller, and is used to form a relatively rotating electrical connection path with the dynamic conductive component. One end of the connecting wire is electrically connected to the conductive ring, and the other end is inserted into the receiving cavity and electrically connected to the electrical control system inside the detector body.

[0008] Optionally, the dynamic conductive component includes a rotating plate and brushes, wherein, The rotating plate is fixedly mounted on the side of the take-up roller facing the conductive ring; The brush is located on the side of the rotating plate facing the conductive ring and is in contact with the conductive ring to form a relatively rotating electrical connection path. The brush is electrically connected to the detection line.

[0009] Optionally, the take-up structure further includes a protective plate, which is disposed in the receiving cavity and located between the probe and the take-up roller. A limit hole is provided on the protective plate at the end corresponding to the connection between the detection line and the probe.

[0010] Optionally, the take-up structure further includes a limiting ring block, which is disposed on the end where the detection line is connected to the probe, and the outer diameter of the limiting ring block is larger than the inner diameter of the limiting through hole; When the probe separates from the detection line, the limiting ring block is blocked at the limiting through hole of the protective plate when the detection line is retracted by the winding roller, thereby preventing the insertion head at the end of the detection line from being over-wound into the receiving cavity.

[0011] Optionally, the take-up structure further includes a threaded limiting rod, which is located at the top of the detector body. The bottom of the threaded limiting rod passes downward through the detector body and extends to the pin of the take-up roller. The threaded limiting rod is threadedly connected to the detector body to limit the rotation of the pin.

[0012] Optionally, the take-up structure also includes a knob located at the top of the threaded limit rod for driving the threaded limit rod to rotate.

[0013] Optionally, an ACFM crack detector with a modular probe structure further includes a limiting plate, which is detachably disposed at the bottom of the probe. A limiting groove is provided at the bottom of the receiving groove, and the limiting plate can be inserted into the receiving groove through the limiting groove.

[0014] Optionally, the side wall of the receiving groove is provided with a pick-and-place slot so that a finger can be inserted to insert or remove the probe.

[0015] Optionally, an ACFM crack detector with a modular probe structure also includes a handle, which is located at one end of the detector body with a receiving groove, and the two ends of the handle are rotatably connected to both sides of the detector body.

[0016] Compared with the prior art, the ACFM crack detector with a modular probe structure provided by this utility model has the following advantages: (1) By integrating the take-up structure and electrical transmission components into the detector body, the problem of chaotic management of ACFM detector probes and cables is effectively solved. The take-up structure realizes automatic take-up and untake-up of the detection line through a take-up roller driven by a spiral spring, completely avoiding damage caused by cable tangling, knotting, and excessive bending, and eliminating safety hazards in on-site operations. The electrical transmission components adopt a combination of static circuit components and dynamic conductive components to maintain a stable electrical connection path during the rotation of the take-up roller, ensuring signal transmission quality.

[0017] (2) Through the specially designed receiving slot and detachable probe structure, a dedicated storage space is provided for the precision probe, which effectively prevents the probe from being damaged or having poor contact due to bumps or oil contamination during transportation and storage. The detachable nature of the probe and the limiting plate makes it easy to replace the corresponding probe according to the actual situation. At the same time, the design of the protective plate and the limiting ring block prevents the detection line from being over-wound. Through the structural optimization of the limiting plate and the pick-up and put-down slot, the pick-up and put-down operation of the probe is more convenient and reliable. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of an ACFM crack detector with a modular probe structure according to the present invention. Figure 2 for Figure 1 Sectional view along line AA; Figure 3 This is a schematic diagram of the take-up structure of an ACFM crack detector with a modular probe structure according to the present invention. Figure 4 for Figure 2 Sectional view along the BB direction; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 This is a schematic diagram of the dynamic conductive component structure of an ACFM crack detector with a modular probe structure according to the present invention. Figure 7 This is a schematic diagram of the static circuit components of an ACFM crack detector with a modular probe structure according to the present invention.

[0019] In the diagram: 1. Detector body; 101. Receiving cavity; 102. Receiving groove; 103. Limiting slide; 104. Pick-up and drop-off slot; 2. Probe; 3. Take-up structure; 301. Limiting through hole; 31. Detection line; 32. Take-up roller; 33. Spiral spring; 34. Protective plate; 35. Limiting ring block; 36. Threaded limiting rod; 37. Knob; 4. Electrical transmission assembly; 41. Static circuit assembly; 411. Fixing plate; 412. Conductive ring; 413. Connecting wire; 42. Dynamic conductive assembly; 421. Rotating plate; 422. Brush; 5. Limiting insert plate; 6. Handle. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0022] In the description of the embodiments of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0025] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0026] Please see Figure 1-7 This application proposes an ACFM crack detector with a modular probe structure, comprising a detector body 1, a probe 2, a take-up structure 3, and an electrical transmission component 4.

[0027] like Figure 1-7As shown, the detector body 1 has a receiving cavity 101 inside, and a receiving groove 102 communicating with the receiving cavity 101 is opened at one end of the detector body 1; the probe 2 is detachably installed in the receiving groove 102; the take-up structure 3 includes a detection wire 31, a take-up roller 32 and a spiral spring 33; the take-up roller 32 is arranged laterally in the receiving cavity 101, and its two ends are rotatably connected to the side wall of the receiving cavity 101 by pins, and the detection wire 31 is wound on the take-up roller 32; the spiral spring 33 includes two, which are arranged on the side wall of the receiving cavity 101 corresponding to the take-up roller 32. The pins at both ends of the winding roller 32 are used to drive the take-up roller 32 to perform the winding operation; the electrical transmission component 4 includes a static circuit component 41 and a dynamic conductive component 42; the static circuit component 41 is located in the receiving cavity 101 and is electrically connected to the electrical control system in the detector body 1; the dynamic conductive component 42 is located on the take-up roller 32 and rotates with it, and forms a relatively rotating electrical connection path with the static circuit component 41; one end of the detection line 31 is electrically connected to the dynamic conductive component 42, and the other end is detachably connected to the probe 2.

[0028] Specifically, by integrating the take-up structure 3 and the electrical transmission component 4 into the detector body 1, a complete modular probe management system is formed; the receiving slot 102 provides a dedicated storage space for the probe 2, avoiding damage caused by random placement of the probe; the take-up roller 32 driven by the spiral spring 33 realizes the automatic take-up and untake-up function of the detection line 31, fundamentally solving the problem of cable entanglement; the electrical transmission component 4 adopts a dynamic-static combination design, and through the cooperation of the static circuit component 41 and the dynamic conductive component 42, a stable electrical connection is maintained during the rotation of the take-up roller 32, ensuring that the signal transmission quality is not affected and significantly improving the reliability of the detection data.

[0029] In some embodiments, such as Figure 2-7 As shown, the static circuit assembly 41 includes a fixing plate 411, a conductive ring 412, and a connecting wire 413. The fixing plate 411 is fixed to the bottom of the receiving cavity 101 and located on one side of the take-up roller 32. The fixing plate 411 has a clearance hole at the pin shaft corresponding to the take-up roller 32. The conductive ring 412 is located on the side of the fixing plate 411 facing the take-up roller 32 and is used to form a relative rotational electrical connection path with the dynamic conductive assembly 42. One end of the connecting wire 413 is electrically connected to the conductive ring 412, and the other end is inserted into the receiving cavity 101 and electrically connected to the electrical control system in the detector body 1.

[0030] Specifically, the fixing plate 411 provides a stable mounting base for the entire static circuit assembly 41, and the clearance hole on it ensures the free rotation of the pin of the take-up roller 32; the conductive ring 412 is made of wear-resistant conductive material and maintains continuous contact with the dynamic conductive assembly 42 to form a reliable rotating electrical connection path; the connecting wire 413 transmits the signal from the conductive ring 412 to the electrical control system in the detector body 1, ensuring the stability and continuity of signal transmission during the continuous rotation of the take-up roller 32, and avoiding signal attenuation or interruption caused by wire entanglement.

[0031] In some embodiments, such as Figure 2-7 As shown, the dynamic conductive component 42 includes a rotating plate 421 and a brush 422. The rotating plate 421 is fixedly disposed on the side of the take-up roller 32 facing the conductive ring 412. The brush 422 is disposed on the side of the rotating plate 421 facing the conductive ring 412 and is in contact with the conductive ring 412 to form a relatively rotating electrical connection path. The brush 422 is electrically connected to the detection line 31.

[0032] Specifically, the rotating plate 421 rotates synchronously with the take-up roller 32, providing an installation platform for the brush 422; the brush 422 is made of highly conductive material and maintains elastic contact with the conductive ring 412, maintaining a good electrical connection throughout the rotation process; the sliding contact conductive design ensures continuous transmission of power and signals during the winding and unwinding process, avoiding the contact problems that may occur with traditional plug-in interfaces, and greatly extending the service life of the equipment.

[0033] In some embodiments, such as Figure 2 , Figure 7 As shown, the take-up structure 3 also includes a protective plate 34, which is located in the receiving cavity 101 and between the probe 2 and the take-up roller 32. A limit hole 301 is provided on the protective plate 34 at the end where the detection line 31 is connected to the probe 2.

[0034] Specifically, the protective plate 34, as an important component of the take-up structure 3, effectively isolates the working area of ​​the take-up roller 32 from the probe storage area, preventing interference to the probe 2 during cable take-up and take-down. The limiting through hole 301 provides a standardized exit channel for the detection line 31, ensuring that the cable always maintains the correct path during take-up and take-down, avoiding messy distribution of the cable in the receiving cavity 101, and further improving the reliability and service life of the equipment.

[0035] In some embodiments, such as Figure 2-3 , Figure 7As shown, the take-up structure 3 also includes a limiting ring block 35, which is located on the end of the detection line 31 connected to the probe 2. The outer diameter of the limiting ring block 35 is larger than the inner diameter of the limiting through hole 301. When the probe 2 is separated from the detection line 31, the limiting ring block 35 is blocked at the limiting through hole 301 of the protective plate 34 when the detection line 31 is retracted by the take-up roller 32, thereby preventing the insertion head at the end of the detection line 31 from being over-wound into the receiving cavity 101.

[0036] Specifically, the limiting ring 35 and the protective plate 34 work together to form an effective overwind protection mechanism. When the probe 2 separates from the detection line 31, the limiting ring 35 retracts along with the detection line 31. When its outer diameter is larger than the inner diameter of the limiting through hole 301, it is blocked, preventing the insertion head at the end of the detection line 31 from being over-wound. This avoids damage caused by the insertion head being wound into the take-up roller 32, and also ensures the ease of reconnection of the probe 2, greatly improving the ease of use and reliability of the equipment.

[0037] In some embodiments, such as Figure 1 , Figure 4 As shown, the take-up structure 3 also includes a threaded limiting rod 36. The threaded limiting rod 36 is located at the top of the detector body 1. The bottom of the threaded limiting rod 36 passes downward through the detector body 1 and extends to the pin of the take-up roller 32. The threaded limiting rod 36 is threadedly connected to the detector body 1 to limit the rotation of the pin.

[0038] Specifically, the threaded limit rod 36 provides a precise locking function for the position of the take-up roller 32. By rotating the threaded limit rod 36, its bottom can abut against the pin of the take-up roller 32, thereby mechanically locking the rotation of the take-up roller 32. This keeps the detection line 31 in the pulled-out state during use, facilitating the detection work of the probe 2. At the same time, it can effectively prevent the take-up roller 32 from rotating accidentally during equipment transportation or when it is not used for a long time, keeping the detection line 31 at a fixed length, thus improving the portability and safety of the equipment.

[0039] In some embodiments, such as Figure 4 As shown, the take-up structure 3 also includes a knob 37, which is located on the top of the threaded limit rod 36 and is used to drive the threaded limit rod 36 to rotate.

[0040] Specifically, the knob 37 adopts an anti-slip design, providing the operator with a convenient operating interface for the threaded limit rod 36; by rotating the knob 37, the threaded limit rod 36 can be easily raised and lowered, thereby quickly locking or releasing the take-up roller 32, greatly improving the convenience of equipment operation and making the fixing and releasing of the take-up length simple and efficient.

[0041] In some embodiments, such as Figure 1As shown, an ACFM crack detector with a modular probe structure also includes a limiting plate 5. The limiting plate 5 is detachably disposed at the bottom of the probe 2. A limiting groove 103 is provided at the bottom of the receiving groove 102. The limiting plate 5 can be inserted into the receiving groove 102 through the limiting groove 103.

[0042] Specifically, the cooperation between the limiting plate 5 and the limiting slide 103 provides a precise positioning and fixing mechanism for the probe 2; different models of probe 2 can be equipped with limiting plates 5 of specific shapes, and the limiting slide 103 ensures the correct installation position. This not only ensures the stability of the probe 2 in the receiving groove 102 and prevents shaking damage during transportation, but also enables the equipment to be compatible with a variety of probe models, greatly improving the versatility and practicality of the equipment.

[0043] In some embodiments, such as Figure 1 As shown, the side wall of the receiving groove 102 is provided with a pick-and-place slot 104 so that a finger can be inserted to insert and remove the probe 2.

[0044] Specifically, the opening of the pick-and-place slot 104 fully considers the principles of ergonomics, providing sufficient operating space for the operator. Through the pick-and-place slot 104, the operator can easily insert their fingers into the receiving slot 102 to easily complete the pick-and-place operation of the probe 2, avoiding the difficulty of picking and placing the probe due to insufficient operating space, greatly improving the efficiency of on-site testing, and also reducing the risk of accidental damage to the precision probe.

[0045] In some embodiments, such as Figure 1 As shown, an ACFM crack detector with a modular probe structure also includes a handle 6, which is located at one end of the detector body 1 with a receiving groove 102, and the two ends of the handle 6 are rotatably connected to the two sides of the detector body 1.

[0046] Specifically, the handle 6 adopts a rotatable design, which can be unfolded as a carrying component when the equipment needs to be moved, and can be folded up to avoid interfering with the detection operation when in use. The handle 6 is located at one end of the detector body 1 with the receiving groove 102. This layout maintains the balance of the equipment's center of gravity, making it easy to carry and move. At the same time, when carrying it, one end of the probe 2 faces upward, thereby avoiding the probe from slipping and being damaged. This greatly improves the portability and practicality of the equipment, and is especially suitable for on-site working environments where the detection location needs to be moved frequently.

[0047] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An ACFM crack detector with a modular probe structure, characterized in that, It includes the detector body (1), probe (2), take-up structure (3), and electrical transmission assembly (4), among which, The detector body (1) has a receiving cavity (101) inside, and a receiving groove (102) communicating with the receiving cavity (101) is provided at one end of the detector body (1). The probe (2) is detachably installed in the receiving groove (102); The take-up structure (3) includes a detection line (31), a take-up roller (32), and a spiral spring (33). The take-up roller (32) is arranged laterally in the receiving cavity (101), and its two ends are rotatably connected to the side wall of the receiving cavity (101) by pins. The detection line (31) is wound on the take-up roller (32). The spiral spring (33) includes two springs, which are located at the pins at both ends of the take-up roller (32) on the side wall of the receiving cavity (101) to drive the take-up roller (32) to perform the take-up operation; The electrical transmission component (4) includes a static circuit component (41) and a dynamic conductive component (42). The static circuit assembly (41) is located in the receiving cavity (101) and is electrically connected to the electrical control system in the detector body (1); The dynamic conductive component (42) is mounted on the take-up roller (32) and rotates with it, forming a relatively rotating electrical connection path with the static circuit component (41); one end of the detection line (31) is electrically connected to the dynamic conductive component (42), and the other end is detachably connected to the probe (2).

2. The ACFM crack detector with a modular probe structure according to claim 1, characterized in that, The static circuit assembly (41) includes a fixing plate (411), a conductive ring (412), and connecting wires (413), wherein, The fixing plate (411) is fixed to the bottom of the receiving cavity (101) and located on one side of the take-up roller (32). The fixing plate (411) has a clearance hole at the pin of the take-up roller (32). The conductive ring (412) is located on the side of the fixed plate (411) facing the take-up roller (32) and is used to form a relatively rotating electrical connection path with the dynamic conductive component (42). One end of the connecting wire (413) is electrically connected to the conductive ring (412), and the other end is inserted into the receiving cavity (101) and electrically connected to the electrical control system in the detector body (1).

3. The ACFM crack detector with a modular probe structure according to claim 2, characterized in that, The dynamic conductive component (42) includes a rotating plate (421) and a brush (422), wherein, The rotating plate (421) is fixedly mounted on the side of the take-up roller (32) facing the conductive ring (412); The brush (422) is located on the side of the rotating plate (421) facing the conductive ring (412) and is in contact with the conductive ring (412) to form a relatively rotating electrical connection path. The brush (422) is electrically connected to the detection line (31).

4. The ACFM crack detector with a modular probe structure according to claim 1, characterized in that, The take-up structure (3) also includes a protective plate (34), which is located in the receiving cavity (101) and between the probe (2) and the take-up roller (32). A limit hole (301) is provided on the protective plate (34) at the end where the detection line (31) is connected to the probe (2).

5. An ACFM crack detector with a modular probe structure according to claim 4, characterized in that, The take-up structure (3) also includes a limiting ring block (35), which is located at the end where the detection line (31) is connected to the probe (2). The outer diameter of the limiting ring block (35) is larger than the inner diameter of the limiting through hole (301). When the probe (2) separates from the detection line (31), the limiting ring block (35) is blocked at the limiting through hole (301) of the protective plate (34) when the detection line (31) is retracted by the winding roller (32), thereby preventing the insertion head at the end of the detection line (31) from being over-wound into the receiving cavity (101).

6. The ACFM crack detector with a modular probe structure according to claim 1, characterized in that, The take-up structure (3) also includes a threaded limiting rod (36), which is located at the top of the detector body (1). The bottom of the threaded limiting rod (36) passes downward through the detector body (1) and extends to the pin of the take-up roller (32). The threaded limiting rod (36) is threadedly connected to the detector body (1) to limit the rotation of the pin.

7. An ACFM crack detector with a modular probe structure according to claim 1, characterized in that, The take-up structure (3) also includes a knob (37) located on the top of the threaded limit rod (36) for driving the threaded limit rod (36) to rotate.

8. An ACFM crack detector with a modular probe structure according to claim 1, characterized in that, It also includes a limiting plate (5), which is detachably located at the bottom of the probe (2). A limiting groove (103) is provided at the bottom of the receiving groove (102), and the limiting plate (5) can be inserted into the receiving groove (102) through the limiting groove (103).

9. An ACFM crack detector with a modular probe structure according to claim 8, characterized in that, The side wall of the receiving groove (102) is provided with a pick-and-place slot (104) so ​​that fingers can be inserted to insert and remove the probe (2).

10. An ACFM crack detector with a modular probe structure according to any one of claims 1-9, characterized in that, It also includes a handle (6), which is located at one end of the detector body (1) having a receiving groove (102), and the two ends of the handle (6) are rotatably connected to both sides of the detector body (1).

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