A copper tube defect detection device

Abstract

The application relates to the technical field of detection equipment, in particular to a copper pipe defect detection device, which comprises a rack and a guide ring installed on the rack, coils and a moving table are arranged on the rack and the guide ring respectively, an alternating current is input into the coils, and a magnetic gathering plate is arranged on the moving table; the magnetic field is concentrated within a distance along the conveying direction of the copper pipe, the magnetic field covers a small area in the circumferential direction of the copper pipe, the high concentration of the magnetic field is realized, the magnetic field realizes the flat scanning of the circumferential direction of the copper pipe under the condition of high concentration by combining the circumferential movement of the magnetic gathering plate around the copper pipe, the comprehensive detection of the circumferential direction of the copper pipe is realized, the detection sensitivity is effectively improved, the defect position can be directly detected during the flat scanning, the direct positioning of the defect is facilitated, and the detection accuracy is improved; the magnetic gathering plate spirally moves relative to the copper pipe.

Description

Technical Field

[0001] This invention relates to the field of testing equipment technology, and in particular to a copper pipe defect detection device. Background Technology

[0002] Copper tubes, as highly efficient heat transfer carriers, are widely used in key industrial fields such as refrigeration, aerospace, power, and construction. Their quality and reliability are directly related to the safe operation and service life of the entire equipment system. During the processing of copper tubes, internal defects such as porosity, inclusions, cracks, and shrinkage cavities are easily generated due to factors such as fluctuations in process parameters, uneven cooling, or impurity entrapment. These defects not only significantly reduce the electrical and thermal conductivity and mechanical strength of copper tubes, but may also become the origin of stress cracks in subsequent processing or high-pressure service environments, leading to medium leakage or even structural failure, posing serious safety hazards.

[0003] Currently, non-destructive testing of copper tubes in industry mainly relies on eddy current testing technology. This technology works by passing an alternating current through a coil fitted around the outside of the copper tube, generating an alternating magnetic field around the coil. The copper tube is placed within this alternating magnetic field, inducing circulating currents, i.e., eddy currents, inside the tube. When a defect exists in the copper tube, the distribution and intensity of the eddy currents change. This disturbed eddy current generates a reverse alternating magnetic field, which reacts with the magnetic field on the coil, thus changing the coil's impedance. By detecting the coil current or voltage, the presence of a defect in the copper tube can be determined. However, traditional eddy current testing methods can only inspect the entire copper tube passing through the coil and cannot detect the specific location of the defect. Furthermore, its magnetic field is relatively diffuse and the energy is not concentrated, resulting in low detection sensitivity. Summary of the Invention

[0004] This invention provides a copper pipe defect detection device, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A copper pipe defect detection device includes a frame and a ring seat disposed thereon. A detection component is disposed on the ring seat, and an electromagnetic component is disposed on the frame corresponding to the detection component. The electromagnetic component is connected to the detection component through a magnetically conductive component.

[0007] The detection component includes a motion stage and a magnetic plate disposed thereon. The motion stage is disposed inside the ring seat and slidably connected thereto. The electromagnetic component includes an iron core and a coil sleeved thereon. The iron core is connected to the magnetic plate through the magnetic conductive component.

[0008] The ring seat is coaxially arranged with the conveying copper pipe, and the magnetic plate is oriented toward the axis of the ring seat and arranged along its axial direction. The motion table is driven by the first power device to move circumferentially along the ring seat, causing the magnetic plate to rotate around once and making the vertical projections of the magnetic plate on the conveying copper pipe intersect.

[0009] Furthermore, two magnetic plates are provided on the motion platform, and two magnetic guiding components are provided corresponding to the two magnetic plates. The two magnetic plates are respectively connected to both ends of the iron core through the two magnetic guiding components.

[0010] Furthermore, the magnetically conductive assembly includes a magnetically conductive plate one, a magnetically conductive ring, and a magnetically conductive plate two, wherein the magnetically conductive ring is connected to the iron core and the magnetically focusing plate through the magnetically conductive plate one and the magnetically conductive plate two, respectively;

[0011] The motion table is configured as an arc plate, and the magnetic ring is sleeved on the outside of the motion table. One end of the first magnetic plate is fixedly connected to the end of the iron core, and the other end is slidably connected to the magnetic ring. One end of the second magnetic plate is fixedly connected to the magnetic plate, and the other end is slidably connected to the magnetic ring.

[0012] Furthermore, a guide rail is provided along the circumference of the inner side of the motion platform, and the magnetic plate is slidably connected to the guide rail. The two magnetic plates are driven to move closer or further apart by a second power device.

[0013] A through hole is provided along the circumference of the motion platform. The second power device is disposed on the outside of the motion platform corresponding to the through hole. The magnetic conductive assembly passes through the through hole and connects the iron core and the magnetic plate.

[0014] Furthermore, the second power device is disposed on the outside of the motion table corresponding to the through hole, and includes a motor, a transmission wheel, and a transmission rod. The motor drives the transmission rod to move circumferentially along the motion table through the transmission wheel.

[0015] The transmission rod is arc-shaped and slidably connected to the motion platform. Two transmission rods are arranged opposite each other on both sides of the transmission wheel, and the two transmission rods are respectively fixedly connected to the two magnetic plates.

[0016] Furthermore, the iron core is connected to the frame via two fixing plates at its two ends. An adjustment assembly is provided on the fixing plates, which is connected to the coil and can adjust the number of turns it has.

[0017] Furthermore, the adjustment assembly includes a transmission ring and an adjustment spring. The transmission ring is coaxially arranged with the iron core and is driven to rotate by a third power device. The adjustment spring is sleeved on the iron core and is fixedly connected to the coil through multiple insulating connectors.

[0018] One end of the adjusting spring and the coil is connected to the transmission ring through the insulating connector, and the other end is fixedly connected to the fixing plate through the insulating connector.

[0019] Furthermore, the transmission ring is rotatably connected to the fixed plate, and the third power device is disposed on the fixed plate corresponding to the transmission ring;

[0020] The third power device includes a second motor and a second transmission wheel mounted on its output shaft. The second motor drives the transmission ring to rotate through the second transmission wheel.

[0021] Furthermore, a conductive ring is provided on the fixed plate. The conductive ring is coaxially arranged with the iron core. The coil is electrically connected to the conductive ring through a conductive sheet. The conductive sheet is disposed at one end of the coil and is slidably connected to the inner side of the conductive ring.

[0022] Furthermore, the magnetic plate is arranged in a wavy shape on the side near the axis of the ring seat.

[0023] The beneficial effects of this invention are as follows:

[0024] This invention concentrates the magnetic field within a certain distance along the copper tube's transport direction. Since the magnetic field coverage area is smaller in the circumferential direction of the copper tube, this achieves a high degree of magnetic field concentration. Combined with the circumferential movement of a magnetic focusing plate around the copper tube, this highly concentrated magnetic field can perform a horizontal sweep along the circumference of the copper tube, enabling comprehensive circumferential detection and effectively improving detection sensitivity. Furthermore, the horizontal sweep can directly detect defect locations, facilitating direct defect localization and improving detection accuracy. Because the magnetic focusing plate moves in a spiral motion relative to the copper tube, and at least a portion of its area overlaps with the tube during one rotation, the magnetic field released from the end of the magnetic focusing plate can fully cover the surface of the copper tube, avoiding detection omissions or blind spots caused by a large spiral pitch. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the copper pipe defect detection device in this invention;

[0027] Figure 2 This is a schematic diagram from another perspective of the copper pipe defect detection device in this invention;

[0028] Figure 3 This is a schematic diagram of the electromagnetic component connecting to the detection component via the magnetic conductive component in this invention;

[0029] Figure 4 for Figure 3 A schematic diagram of the exploded structure;

[0030] Figure 5 This is a schematic diagram of the detection component in this invention;

[0031] Figure 6 This is a schematic diagram of the magnetic plate structure on the motion platform in this invention;

[0032] Figure 7 This is a schematic diagram of the electromagnetic component in this invention;

[0033] Figure 8 This is a cross-sectional structural diagram of the electromagnetic component in this invention.

[0034] Reference numerals: 1. Frame; 2. Ring seat; 3. Detection component; 31. Motion table; 311. Guide rail; 312. Through hole; 32. Magnetic plate; 321. Plate body one; 322. Plate body two; 33. First power unit; 331. Rotary motor; 332. Drive wheel; 34. Second power unit; 341. Motor one; 342. Transmission wheel one; 343. Transmission rod; 4. Electromagnetic component; 41. Iron core; 42. Coil; 43. Fixing plate; 44. Adjustment component; 441. Transmission ring; 442. Adjusting spring; 443. Insulating connector; 45. Third power unit; 451. Motor two; 452. Transmission wheel two; 46. Conductive ring; 47. Conductive sheet; 5. Magnetic component; 51. Magnetic plate one; 52. Magnetic ring; 53. Magnetic plate two. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0036] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] like Figures 1 to 8 The copper pipe defect detection device shown includes a frame 1 and an annular seat 2 mounted thereon. A detection component 3 is mounted on the annular seat 2, and an electromagnetic component 4 is mounted on the frame 1 corresponding to the detection component 3. The electromagnetic component 4 is connected to the detection component 3 through a magnetically conductive component 5. The detection component 3 includes a moving stage 31 and a magnetically concentrated plate 32 mounted thereon. The moving stage 31 is located inside the annular seat 2 and is slidably connected to it. The electromagnetic component 4 includes an iron core 41 and a coil 42 sleeved thereon. The iron core 41 is connected to the magnetically concentrated plate 32 through the magnetically conductive component 5. The annular seat 2 is coaxially arranged with the conveying copper pipe. The magnetically concentrated plate 32 faces the axis of the annular seat 2 and is arranged along its axial direction. The moving stage 31 is driven by a first power device 33 to move circumferentially along the annular seat 2, causing the magnetically concentrated plate 32 to rotate around once and causing the vertical projections of the magnetically concentrated plate 32 on the conveying copper pipe to intersect.

[0039] In this invention, the frame 1 is used to support the ring seat 2. The copper tube passes through the ring seat 2 and its conveying direction coincides with the axis of the ring seat 2. To improve the firmness, the number of ring seats 2 can be set to multiple. Multiple ring seats 2 are used in conjunction with the detection component 3 at the same time. In the detection component 3, the first power device 33 drives the motion table 31 to rotate inside the ring seat 2, so that the motion table 31 and the magnetic plate 32 on it move around the circumference of the copper tube.

[0040] Multiple first power units 33 are installed on the frame 1. Each first power unit 33 consists of a rotary motor 331 and a drive wheel 332. The drive wheel 332 is connected to the outer wall of the motion table 31 for transmission. During the circular motion of the motion table 31, at least one set of first power units 33 is connected to the motion table 31.

[0041] The surface of the magnetic plate 32 is coplanar with the direction of copper tube transport. When the magnetic plate 32 rotates around the copper tube, the magnetic field released by the end of the magnetic plate 32 can perform comprehensive detection in the circumferential direction of the copper tube, and the magnetic field maintains a high degree of concentration and detection sensitivity. The coil 42 is connected to an external alternating power supply, thereby enabling the coil 42 to generate an alternating magnetic field. The iron core 41 can concentrate the magnetic field, thereby reducing the amount of magnetic field divergence. The iron core 41 magnetizes the magnetic plate 32 through the magnetic conductive component 5.

[0042] like Figure 5As shown, on the plane perpendicular to the copper pipe conveying direction, the magnetic focusing plate 32 is cone-shaped facing the copper pipe, so that the magnetic field is concentrated and released on the side of the magnetic focusing plate 32 facing the copper pipe, making the magnetic field more concentrated. The side of the magnetic focusing plate 32 facing the copper pipe is set as a strip, so that when the magnetic field is released on this side of the magnetic focusing plate 32, a strip-shaped area of ​​magnetic field release can be formed. This allows the magnetic field released at the end of the magnetic focusing plate 32 to cover a certain area in the copper pipe conveying direction. However, in the circumferential direction of the copper pipe, the coverage area of ​​the magnetic field released at the end of the magnetic focusing plate 32 is smaller, which can improve the sensitivity of magnetic field detection.

[0043] In use, the copper tube passes through the ring seat 2 and is transported horizontally. An alternating power supply is applied to the coil 42, causing the motion table 31 and the magnetic focusing plate 32 to move circumferentially along the ring seat 2. The iron core 41 concentrates the magnetic field generated by the coil 42 and guides it onto the magnetic focusing plate 32. The magnetic focusing plate 32 releases a long, narrow magnetic field towards the end of the copper tube. This magnetic field can cover a larger area in the direction of copper tube transport and a smaller area in the circumferential direction of the copper tube, thereby increasing the magnetic field density. The magnetic focusing plate 32 rotates around the copper tube, and the magnetic field released from the end of the magnetic focusing plate 32 can comprehensively inspect the copper tube in the circumferential direction. Combining the copper tube transport and the circumferential movement of the magnetic focusing plate 32, it can... The magnetic plate 32 moves in a spiral motion relative to the copper tube. As the moving table 31 rotates once, at least a portion of the area of ​​the magnetic plate 32 is vertically projected onto the copper tube and overlaps. This allows the magnetic field released by the magnetic plate 32 to cover all areas of the copper tube surface, enabling highly sensitive defect detection of the copper tube. When a defect exists on the copper tube, the intensity and distribution of the eddy currents inside the copper tube will change. At this time, the alternating magnetic field formed by the eddy currents on the copper tube will interfere with the magnetic field released by the magnetic plate 32 and the coil 42 in the opposite direction. By detecting the current and voltage on the coil 42, the defect signal can be detected, thus achieving the purpose of flaw detection of copper tube defects.

[0044] In this embodiment, auxiliary structures such as controllers and impedance amplifiers can also be configured for the detection component 3; the magnetic plate 32 can be made of one of the following materials: nickel-iron high permeability alloy, permalloy, pure iron, etc.

[0045] This invention concentrates the magnetic field within a certain distance along the copper tube's transport direction. Since the magnetic field coverage area is smaller in the circumferential direction of the copper tube, this concentration is achieved. Combined with the circumferential movement of the magnetic focusing plate 32 around the copper tube, the magnetic field can achieve a horizontal sweep along the circumference of the copper tube under this highly concentrated state, thus enabling comprehensive detection of the circumferential direction of the copper tube. This effectively improves detection sensitivity and allows for direct detection of defect locations during the horizontal sweep, facilitating direct defect localization and improving detection accuracy. Furthermore, because the magnetic focusing plate 32 moves in a spiral motion relative to the copper tube, and at least a portion of its area overlaps with the tube during one rotation, the magnetic field released from the end of the magnetic focusing plate 32 can fully cover the surface of the copper tube, avoiding detection omissions or blind spots caused by a large spiral pitch of the magnetic focusing plate 32.

[0046] In this embodiment, two magnetic focusing plates 32 are provided on the motion stage 31, and two magnetic guiding components 5 are provided corresponding to the two magnetic focusing plates 32. The two magnetic focusing plates 32 are respectively connected to the two ends of the iron core 41 through the two magnetic guiding components 5. The end of one magnetic focusing plate 32 facing the copper tube is used to release magnetic field lines, and the end of the other magnetic focusing plate 32 facing the copper tube is used to receive magnetic field lines. The magnetic field is concentrated between the ends of the two magnetic focusing plates 32, making the area between the ends of the two magnetic focusing plates 32 a highly concentrated magnetic field area. This area can be used to perform concentrated detection on specific positions on the copper tube, further improving the detection sensitivity.

[0047] Since defects such as scratches and cracks on copper tubes can extend in multiple directions, if the end of the magnetic plate 32 is rectangular, the change in eddy current induction on the copper tube is relatively small when the length direction of the rectangle is perpendicular to the length direction of the defect. However, when the length direction of the rectangle is parallel to the length direction of the defect, the area of ​​the magnetic field acting on the defect location is larger, resulting in more sensitive detection. (See also...) Figure 6 As shown, the magnetic plate 32 is wavy on the side near the axis of the ring seat 2; by improving the shape of the long strip at the end of the magnetic plate 32, the phenomenon that the long strip end of the magnetic plate 32 is perpendicular to the defect length direction is effectively avoided, thus improving the detection sensitivity.

[0048] Furthermore, when flaw detection is required for copper tubes of different diameters, the distance between the end of the magnetic plate 32 and the axis of the ring seat 2 needs to be adjusted. (See [reference needed]). Figure 6 As shown, the magnetic focusing plate 32 consists of a plate body one and a plate body two. The plate body one is set on the motion table 31, and the plate body two is adjustablely set on the plate body one along the radial direction of the ring seat 2. The plate body two can be slidably inserted into the plate body one, and the plate body one and the plate body two are fastened together by bolts. The end of the plate body two away from the plate body one is wavy. By loosening the bolts between the plate body one and the plate body two, the position of the plate body two on the plate body one can be adjusted, thereby adjusting the distance between the end of the magnetic focusing plate 32 and the axis of the ring seat 2.

[0049] In this embodiment, the included angle between the two magnetic plates 32 on the motion table 31 can be adjusted, such as... Figure 6 As shown, a guide rail 311 is provided on the inner side of the motion table 31 along its circumference. The magnetic plate 32 is slidably connected to the guide rail 311. The two magnetic plates 32 are driven to move closer or further apart by the second power device 34. A through hole 312 is provided on the motion table 31 along its circumference. The second power device 34 is provided on the outer side of the motion table 31 corresponding to the through hole 312. The magnetic guide assembly 5 passes through the through hole 312 to connect the iron core 41 and the magnetic plate 32.

[0050] The second power device 34 is located on the outside of the motion table 31, corresponding to the through hole 312. It includes a motor 341, a transmission wheel 342, and a transmission rod 343. The motor 341 drives the transmission rod 343 to move circumferentially along the motion table 31 through the transmission wheel 342. The transmission rod 343 is arc-shaped and slidably connected to the motion table 31. There are two transmission rods 343 on both sides of the transmission wheel 342. The two transmission rods 343 are fixedly connected to two magnetic plates 32 respectively.

[0051] Motor 341 drives two transmission rods 343 to move synchronously relative to each other through transmission wheel 342. The two transmission rods 343 can synchronously drive two magnetic plates 32 to move relative to each other, thereby achieving the purpose of adjusting the included angle between the two magnetic plates 32. This adjustment method can prevent the overall center of gravity of the two magnetic plates 32 from shifting.

[0052] When the two magnetic plates 32 are close together, the magnetic field between their ends is relatively concentrated. When the two magnetic plates 32 are far apart, the magnetic field coverage area between them increases, and the magnetic field is still relatively concentrated. When the two magnetic plates 32 are located on both sides of the copper tube, the magnetic field released from the end of one magnetic plate 32 can pass through the copper tube and be transmitted to the other magnetic plate 32. At this time, the magnetic field covers all positions in the circumferential direction of the copper tube, thereby realizing the overall detection of the copper tube. Based on the above adjustment method of the two magnetic plates 32, multi-mode detection of the copper tube can be realized, which can realize both local concentrated detection and full coverage detection in the circumferential direction of the copper tube.

[0053] In this embodiment, as Figure 7 and Figure 8 As shown, the iron core 41 is connected to the frame 1 through two fixing plates 43 set at its two ends. An adjustment component 44 is provided on the fixing plate 43. The adjustment component 44 is connected to the coil 42 and can adjust the number of turns of the coil.

[0054] The adjusting assembly 44 includes a transmission ring 441 and an adjusting spring 442. The transmission ring 441 is coaxially arranged with the iron core 41 and is driven to rotate by a third power device 45. The adjusting spring 442 is sleeved on the iron core 41 and is fixedly connected to the coil 42 through multiple insulating connectors 443. One end of the adjusting spring 442 and the coil 42 is connected to the transmission ring 441 through the insulating connectors 443, and the other end is fixedly connected to the fixing plate 43 through the insulating connectors 443.

[0055] The transmission ring 441 is rotatably connected to the fixed plate 43, and the third power device 45 is set on the fixed plate 43 corresponding to the transmission ring 441. The third power device 45 includes a second motor 451 and a second transmission wheel 452 set on its output shaft. The second motor 451 drives the transmission ring 441 to rotate through the second transmission wheel 452.

[0056] In the specific implementation process, a number of insulating connectors 443 are equally spaced on the adjusting spring 442, and each insulating connector 443 is connected to the coil 42. When one end of the adjusting spring 442 is rotated, the number of turns of the adjusting spring 442 on the iron core 41 changes. At this time, the adjusting spring 442 drives the coil 42 to move synchronously through the several insulating connectors 443, and the number of turns of the coil 42 on the iron core 41 changes, thereby adjusting the magnetic field strength and detection sensitivity.

[0057] Since the magnetic field generated by coil 42 will also be transmitted to the adjusting spring 442, in order to avoid the alternating magnetic field from affecting the adjusting spring 442 or causing the adjusting spring 442 to heat up, a magnetic shielding coating can be applied to the outer wall of the adjusting spring 442. The coating can be made of materials such as permalloy or Mu-metal, which can form a shielding layer on the surface of the adjusting spring 442.

[0058] Furthermore, a conductive ring 46 is provided on the fixing plate 43. The conductive ring 46 is coaxially arranged with the iron core 41. The coil 42 is electrically connected to the conductive ring 46 through a conductive sheet 47. The conductive sheet 47 is located at one end of the coil 42 and is slidably connected to the inner side of the conductive ring 46.

[0059] The other ends of the conductive ring 46 and the coil 42 are respectively connected to the two poles of the external power supply. When the transmission ring 441 rotates and changes the number of turns of the coil 42, the conductive piece 47 slides synchronously on the conductive ring 46. The conductive piece 47 and the conductive ring 46 maintain an electrical connection, thereby ensuring that the coil 42 is always connected to the power supply.

[0060] In this embodiment, as Figure 3 and Figure 4As shown, the magnetic guiding assembly 5 includes a first magnetic guiding plate 51, a magnetic guiding ring 52, and a second magnetic guiding plate 53. The magnetic guiding ring 52 is connected to the iron core 41 and the magnetic focusing plate 32 through the first magnetic guiding plate 51 and the second magnetic guiding plate 53, respectively. The motion table 31 is set as an arc plate, and the magnetic guiding ring 52 is sleeved on the outside of the motion table 31. One end of the first magnetic guiding plate 51 is fixedly connected to the end of the iron core 41, and the other end is slidably connected to the magnetic guiding ring 52. One end of the second magnetic guiding plate 53 is fixedly connected to the magnetic focusing plate 32, and the other end is slidably connected to the magnetic guiding ring 52. The magnetic force at the end of the iron core 41 can be guided to the corresponding magnetic focusing plate 32 through the first magnetic guiding plate 51, the magnetic guiding ring 52, and the second magnetic guiding plate 53. When the motion table 31 rotates, the magnetic focusing plate 32 will drive the second magnetic guiding plate 53 to slide on the magnetic guiding ring 52.

[0061] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A copper pipe defect detection device, characterized in that, It includes a frame and a ring seat mounted thereon, a detection component is mounted on the ring seat, and an electromagnetic component is mounted on the frame corresponding to the detection component. The electromagnetic component is connected to the detection component through a magnetically conductive component. The detection component includes a motion stage and a magnetic plate disposed thereon. The motion stage is disposed inside the ring seat and slidably connected thereto. The electromagnetic component includes an iron core and a coil sleeved thereon. The iron core is connected to the magnetic plate through the magnetic conductive component. The ring seat is coaxially arranged with the conveying copper pipe, the magnetic plate faces the center of the ring seat and is arranged along its axial direction, and the motion table is driven by the first power device to move around the ring seat in the circumferential direction, causing the magnetic plate to rotate around once and making the vertical projections of the magnetic plate on the conveying copper pipe intersect. Two magnetic plates are provided on the motion platform, and two magnetic guiding components are provided corresponding to the two magnetic plates. The two magnetic plates are respectively connected to both ends of the iron core through the two magnetic guiding components. A guide rail is provided along the circumference of the inner side of the motion platform. The magnetic plate is slidably connected to the guide rail. The two magnetic plates are driven to move closer or further apart by a second power device. The magnetic plate is arranged in a wave-like shape on the side near the axis of the ring seat.

2. The copper pipe defect detection device according to claim 1, characterized in that, The magnetic guiding assembly includes a magnetic guiding plate one, a magnetic guiding ring, and a magnetic guiding plate two. The magnetic guiding ring is connected to the iron core and the magnetic focusing plate through the magnetic guiding plate one and the magnetic guiding plate two, respectively. The motion table is configured as an arc plate, and the magnetic ring is sleeved on the outside of the motion table. One end of the first magnetic plate is fixedly connected to the end of the iron core, and the other end is slidably connected to the magnetic ring. One end of the second magnetic plate is fixedly connected to the magnetic plate, and the other end is slidably connected to the magnetic ring.

3. The copper pipe defect detection device according to claim 1, characterized in that, A through hole is provided along the circumference of the motion platform. The second power device is disposed on the outside of the motion platform corresponding to the through hole. The magnetic conductive assembly passes through the through hole and connects the iron core and the magnetic plate.

4. The copper pipe defect detection device according to claim 3, characterized in that, The second power device includes a motor, a transmission wheel, and a transmission rod. The motor drives the transmission rod to move circumferentially along the motion table via the transmission wheel. The transmission rod is arc-shaped and slidably connected to the motion platform. Two transmission rods are arranged opposite each other on both sides of the transmission wheel, and the two transmission rods are respectively fixedly connected to the two magnetic plates.

5. The copper pipe defect detection device according to claim 1, characterized in that, The iron core is connected to the frame via two fixing plates at its two ends. An adjustment component is provided on the fixing plate, which is connected to the coil and can adjust the number of turns of the coil.

6. The copper pipe defect detection device according to claim 5, characterized in that, The adjustment assembly includes a transmission ring and an adjustment spring. The transmission ring is coaxially arranged with the iron core and is driven to rotate by a third power device. The adjustment spring is sleeved on the iron core and is fixedly connected to the coil through multiple insulating connectors. One end of the adjusting spring and the coil is connected to the transmission ring through the insulating connector, and the other end is fixedly connected to the fixing plate through the insulating connector.

7. The copper pipe defect detection device according to claim 6, characterized in that, The transmission ring is rotatably connected to the fixed plate, and the third power device is disposed on the fixed plate corresponding to the transmission ring; The third power device includes a second motor and a second transmission wheel mounted on its output shaft. The second motor drives the transmission ring to rotate through the second transmission wheel.

8. The copper pipe defect detection device according to claim 6, characterized in that, A conductive ring is provided on the fixed plate. The conductive ring is coaxially arranged with the iron core. The coil is electrically connected to the conductive ring through a conductive sheet. The conductive sheet is located at one end of the coil and is slidably connected to the inner side of the conductive ring.

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