Detection device and method for metal cladding

Abstract

Embodiments of this application provide a detection device suitable for metal cladding, comprising: a housing having a detection space formed within it suitable for containing a liquid medium; a rotating member installed in the housing, configured to support and rotate the metal cladding; a movable member installed in the housing, configured to move relative to the rotating member; a detector installed on the movable member and immersed in the liquid medium, configured to emit ultrasonic waves toward the metal cladding immersed in the liquid medium to excite the metal cladding to form Lamb waves, and to receive the Lamb waves; and a processor for controlling the detector to emit ultrasonic waves and obtaining a scanned image based on the Lamb waves, the scanned image being used to confirm whether the metal cladding has defects. Embodiments of this application also provide a detection method.

Description

Technical Field

[0001] This application relates to the field of nondestructive testing of metallic materials, and in particular to a testing device and method suitable for metal cladding. Background Technology

[0002] As a crucial structural component of radioactive sources, the metal cladding seals internal radioactive materials and withstands their mechanical loads. Before a radioactive source is put into use, the weld seams of the metal cladding must undergo non-destructive testing to ensure its safety and service life. Currently, water immersion ultrasonic testing is commonly used, producing waveforms that are typically longitudinal or transverse waves. However, longitudinal and transverse waves have strong penetrability. For thin-walled workpieces such as cladding, using longitudinal or transverse waves results in a large blind zone, making it difficult to meet the requirements for non-destructive testing of metal cladding weld seams during the fabrication of high-heat-generating and high-radiation radioactive sources. Summary of the Invention

[0003] To address at least one of the technical problems mentioned above or in other aspects, embodiments of this application provide a detection device and method suitable for metal cladding, applicable to non-destructive testing of weld seams in metal cladding during the preparation of high-heat-generating and high-radiation radioactive sources.

[0004] According to a first aspect of this application, a detection device suitable for a metal cladding is provided, the metal cladding being suitable for containing radioactive material. The detection device includes: a housing having a detection space formed within it suitable for containing a liquid medium; a rotating member installed in the housing, configured to support and rotate the metal cladding; a movable member installed in the housing, configured to move relative to the rotating member; a detector installed on the movable member and immersed in the liquid medium, configured to emit ultrasonic waves toward the metal cladding immersed in the liquid medium to excite the metal cladding to form Lamb waves, and to receive the Lamb waves; and a processor for controlling the detector to emit ultrasonic waves and obtaining a scan image based on the Lamb waves, the scan image being used to confirm whether the metal cladding has defects.

[0005] According to a second aspect of this application, a method for detecting a metal cladding using the aforementioned detection device is provided, comprising: S100: fixing the metal cladding to a rotating member; S200: purging a liquid medium into a detection space and adjusting a moving member to immerse a probe in the liquid medium; S300: selecting an initial position on the metal cladding and a scanning posture of the probe; S400: controlling at least one of the moving member and the rotating member to move and maintain the scanning posture of the probe, such that the probe and the metal cladding move relative to each other from the initial position to obtain a scanning image; and S500: determining whether a defect exists in the metal cladding based on the scanning image.

[0006] The detection device for metal cladding provided in this application is simple to operate, has high defect identification accuracy, and can adjust the angle of the probe for scanning according to different cladding materials. It has a wide range of applications and is particularly suitable for high-precision non-contact non-destructive testing of thin-walled tubular materials clad with high heat generation and strong radiation sources. Attached Figure Description

[0007] The above and other objects, features and advantages of this application will become clearer from the following description of embodiments with reference to the accompanying drawings, in which:

[0008] Figure 1 This is a schematic diagram of a radioactive metal detection device according to an embodiment of this application;

[0009] Figure 2 yes Figure 1 A schematic diagram of the rotating component shown;

[0010] Figure 3 yes Figure 1 A schematic diagram of the moving component shown;

[0011] Figure 4 This is a schematic diagram of the structure of the metal casing according to an embodiment of this application;

[0012] Figure 5 yes Figure 4 A schematic diagram showing the scanning state of the metal casing and the detector;

[0013] Figure 6 yes Figure 5 Enlarged view of point A in the middle.

[0014] The meanings of the reference numerals in the above figures are as follows:

[0015] Shell-1;

[0016] Rotating component-2;

[0017] Base -21;

[0018] Locking structure -22;

[0019] Sliding block-221; Locking component-222;

[0020] Limiting groove -23;

[0021] Metal cladding-3;

[0022] Detector-4;

[0023] Moving part -5;

[0024] Mobile Seat-51;

[0025] Column-52;

[0026] Move block -53;

[0027] Connecting rod -54;

[0028] First steering mechanism -55;

[0029] Second steering mechanism -56;

[0030] Processor-6. Detailed Implementation

[0031] The embodiments of this application will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of this application. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of this application for ease of explanation. However, it will be apparent that one or more embodiments may be implemented without these specific details. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concepts of this application.

[0032] The embodiments of this application first provide a detection device suitable for metal cladding. The metal cladding can be a cladding used to contain radioactive materials, such as the metal cladding of an ion source, or any other metal cladding that needs to be inspected; no specific limitation is made. The detection device can be used to perform non-destructive testing on the metal cladding to determine whether there are defects in the metal cladding. These defects may include, but are not limited to, cracks or fissures on the surface of the metal cladding that could lead to leakage of materials inside the metal cladding.

[0033] Reference Figure 1 The detection device may include a housing 1, a rotating component 2, a probe 4, a moving component 5, and a processor 6.

[0034] The housing 1 forms a detection space suitable for containing liquid media. In actual use, a suitable liquid media can be injected into the housing 1 to construct the detection environment. The liquid media can be water. Those skilled in the art can select a suitable liquid media according to the relevant requirements of the actual selected detector, without any limitation.

[0035] The rotating component 2 is installed inside the housing 1 and is configured to support the metal casing being tested and rotate it. The rotating component 2 can be installed at the bottom of the housing 1 or at other suitable locations.

[0036] The movable member 5 is mounted on the housing 1 and configured to move relative to the rotating member 2. As an example, the movable member 5 may be configured to move along one or more walls of the housing 1 to achieve movement relative to the rotating member 2. In some embodiments, the movable member 5 may be configured to move relative to the rotating member 2 in multiple degrees of freedom.

[0037] The detector 4 is mounted on the movable part 5. When the movable part 5 moves, it can drive the detector 4 to move. Thus, by rotating the rotating part 2 and / or moving the movable part 5, the detector 4 can detect different positions of the metal shell.

[0038] In practical use, the movable element 5 is immersed in a liquid medium, and it can emit ultrasonic waves toward the metal cladding to be tested, which is also immersed in the liquid medium, to excite the metal cladding to form Lamb waves, and receive the Lamb waves. The probe 4 can be any suitable ultrasonic detection device capable of performing the above functions. As an example, the probe 4 can be a water-immersion focused high-quality piezoelectric composite probe.

[0039] The processor 6 is configured to control the detector 4 to emit ultrasonic waves and obtain a scan image based on the Lamb wave received by the detector 4. This scan image can be used to confirm whether there are defects in the metal casing under test.

[0040] The detection device provided in this application uses Lamb waves to detect the internal structure of the metal cladding of a high-temperature radioactive source. Because the surface echo width of the Lamb wave is narrower than the emission pulse width, the detection blind zone can be reduced, thus enabling the detection of propagation within thinner workpieces. It is more suitable for detecting thin-walled materials and has the advantages of high detection sensitivity and high detection efficiency. In particular, it can meet the needs of non-destructive testing of welds in metal cladding during the preparation of high-heat and high-radiation radioactive sources.

[0041] Meanwhile, the detection device provided in this application is simple to operate, has high defect identification accuracy, and can control the movement of the moving part 5 according to different shell materials, thereby adjusting the angle of the detector 4 for scanning, and has a wide range of applications.

[0042] In some embodiments, the processor 6 may be configured to control the movement of at least one of the moving member 5 and the rotating member 2, such that the probe member 4 and the metal casing move relative to each other.

[0043] In some embodiments, the processor 6 may also be configured to control the movement of the moving part 5 to adjust the orientation of the detector 4, thereby changing the angle between the detector 4 and the metal casing, so that the detector 4 can receive a higher intensity Lamb wave, thereby improving the accuracy and efficiency of detection.

[0044] In some embodiments, the processor 6 can also be configured to control the operating mode of the probe 4. For example, for a thick metal cladding, the probe 4 can be used to scan perpendicular to the workpiece, using longitudinal or transverse waves for detection.

[0045] Figure 2 yes Figure 1 A schematic diagram of the rotating component is shown. In some embodiments, such as Figure 2 As shown, the rotating component 2 includes a base 21 and a plurality of locking structures 22. The base 21 is rotatably mounted on the bottom of the housing 1 about a first axis extending in a first direction, and the plurality of locking structures 22 are configured to position the metal cladding on the base 21 such that the geometric center of the metal cladding is located on the first axis.

[0046] In some embodiments, the base 21 is provided with a plurality of radially extending limiting grooves 23, and each locking structure 22 may include a sliding block 221 and a locking member 222 fixed on the sliding block 221.

[0047] The sliding block 221 is radially slidably engaged with a set of limiting grooves 23. The locking member 222 is installed on the sliding block 221. By operating the locking member 222, the sliding block 221 can be allowed or prevented from sliding relative to the limiting grooves 23, thereby positioning the metal shell on the base 21 or removing the metal shell from the base 21.

[0048] In some embodiments, the maximum rotational speed of the rotating component 2 can be set to 30 r / min.

[0049] In some embodiments, the rotating member 2 also has a mounting groove in the middle for placing the workpiece. The mounting groove can be used to mount the metal shell. The size and shape of the mounting groove can be reasonably set according to the size and shape of the metal shell to be detected, without limitation.

[0050] As an example, in actual use, the locking member 222 can be loosened using an extension wrench, allowing the sliding block 221 to slide to the appropriate position. Then, the metal casing can be placed in the mounting groove in the center of the rotating member 2. By manually tightening the locking member 222 of the locking structure 22, the opening of the metal casing can be ensured to face downwards. By rotating the extension wrench clockwise, the metal casing can be clamped.

[0051] Figure 3 yes Figure 1 A schematic diagram of the movable element 5 shown. In some embodiments, such as Figure 3 As shown, the movable element 5 can be configured to move upward relative to the base 21 in a first direction, a second direction perpendicular to the first direction, and a third direction perpendicular to the first and second directions, under the control of the processor 6.

[0052] In some embodiments, the movable member 5 may specifically include a movable base 51, a column 52, a movable block 53, and a connecting rod 54. The movable base 51 is horizontally mounted on the housing 1 and configured to move linearly in a second direction at the upper part of the housing 1. The lower end of the column 52 is mounted on the movable base 51 and configured to move linearly in a third direction relative to the movable base 51. The movable block 53 is mounted on the column 52 and configured to move up and down relative to the column 52 in a first direction. The connecting rod 54 is mounted on the movable block 53, and the probe 4 is mounted on the lower end of the connecting rod 54.

[0053] In some embodiments, the moving member 5 may further include a first steering mechanism 55 and a second steering mechanism 56, the first steering mechanism 55 being rotatably mounted on the lower end of the connecting rod 54 about a second axis extending in a third direction; and the second steering mechanism 56 being rotatably mounted on the first steering mechanism 55 about a third axis extending in a second direction, and the probe 4 being mounted on the second steering mechanism 56.

[0054] In this embodiment, the first direction can be denoted as the Z-axis direction perpendicular to the rotating member 2, the second direction as the Y-axis direction perpendicular to the Z-axis direction, and the third direction as the X-axis direction perpendicular to both the Z-axis and Y-axis. The rotation of the first steering mechanism 55 is denoted as rotation in the G-direction, the rotation of the second steering mechanism 56 is denoted as rotation in the S-direction, and the direction of rotation of the rotating member 2 along the first axis is denoted as rotation in the R-direction. Thus, a six-axis linkage is formed between the moving member 5 and the rotating member 2 along the axis, connecting the metal casing and the detector 4.

[0055] In some embodiments, the positioning accuracy of the movable seat 51, column 52 and movable block 53 in the movable member 5 is ≤0.1mm; the repeatability of positioning is ≤0.1mm; and the positioning accuracy of the manually adjusted first steering mechanism 55 and second steering mechanism 56 is ≤0.05°.

[0056] In some embodiments, the detection device may further include a water pump and a filter. The water pump may be connected to the housing 1 via a pipe and can regulate the water level in the detection space. The filter, which may be located at the junction of the pipe and the housing 1, is used to reduce contaminants in the water within the detection space.

[0057] In some embodiments, at least a portion of the sidewall of the housing 1 is made transparent to allow observation of the working state within the detection space. As an example, a portion of the sidewall of the housing 1 is made of a robust and reliable transparent material, while the remainder is made of high-strength stainless steel, thereby ensuring the strength of the housing 1.

[0058] Embodiments of this application also provide a method for detecting a metal cladding using a detection device described in any of the embodiments above, comprising: S100 to S500.

[0059] S100: Secure the metal casing to the base 21.

[0060] S200: Pour liquid medium into the detection space and adjust the moving part 5 so that the detector 4 is immersed in the liquid medium.

[0061] S300: Select the initial position on the metal casing to determine the scanning posture of the detector 4.

[0062] S400: Control at least one of the moving part 5 and the rotating part 2 to move and maintain the scanning posture of the detector 4, so that the detector 4 and the metal shell move relative to each other from the initial position to obtain a scanned image.

[0063] S500: Determines whether there are defects in the metal casing based on scanned images.

[0064] The initial position described in S300 refers to the position of the ultrasonic wave radiated by the detector 4 on the metal casing when detection begins, while the scanning attitude refers to the attitude of the detector 4, such as the angle between the detector 4 and one or more surfaces of the metal casing. The detection position described in S400 refers to the position where the ultrasonic wave emitted by the detector 4 radiates onto the metal casing.

[0065] In S400, the detector 4 can be moved along a suitable scanning path by controlling the movement of at least one of the moving part 5 and the rotating part 2. During the scanning process, the detector 4 does not contact the metal casing, making the process of the detector 4 emitting and receiving ultrasonic waves relatively stable. This allows for sound beam focusing, further meeting the needs of the device for high sensitivity and high resolution detection.

[0066] The scanning path can be set according to actual needs. For example, the scanning path can be a complete rotation around the metal casing starting from the starting position.

[0067] The scanned image may include one or more of scanned image A, scanned image B, and scanned image C.

[0068] The A-scan image displays the relationship between the amplitude and propagation time of the ultrasonic signal in a rectangular coordinate system, with the horizontal axis representing the propagation time of the sound wave and the vertical axis representing the signal amplitude.

[0069] The B-scan image shows a cross-section that is parallel to the direction of the ultrasonic beam propagation and perpendicular to the measuring surface of the metal casing, i.e., the point on the surface of the detector 4 perpendicular to the metal casing.

[0070] C-scan images convert the waveforms obtained from A-scan images into digital images. Each numerical point in the image is represented by a different color, thus providing a more intuitive view of the internal structure of the metal cladding and the location of defects. Generally, the darker the color, the more likely it is to be the location of a defect.

[0071] Furthermore, gates can be set according to the scanned images that need to be acquired to prevent interference from other data. For example, a synchronization gate can be set to frame the initial wave, a data gate can be set after the initial wave and before the bottom reflection echo, and an interface gate can be set to frame both the initial wave and the bottom reflection echo.

[0072] In some embodiments, S300 may specifically include:

[0073] S310: The attitude of the detector 4 is adjusted by adjusting the moving part 5, so that the ultrasonic wave emitted by the detector 4 is at a predetermined position on the metal shell, and the deflection angle of the radiation axis of the detector 4 relative to the normal of the plane tangent to the predetermined position of the metal shell is a predetermined deflection angle.

[0074] S320: Continue to adjust the attitude of the detector 4 and monitor the intensity of the received Lamb wave.

[0075] S330: Determine the position of the ultrasonic wave emitted by the detector 4 on the metal shell when the intensity of the received Lamb wave is at its maximum as the initial position, and determine the attitude of the detector 4 at this time as the scanning attitude.

[0076] Understandably, the initial position in S330 is a position adjusted based on the predetermined position, which will be very close to the predetermined position. Therefore, the predetermined position in S310 can be the position where the detection is expected to begin. In some embodiments, the predetermined position can be the edge where the upper surface of the metal shell intersects with the sidewall.

[0077] The predetermined deflection angle in S310 can be an angle that ensures the ultrasonic waves emitted by the detector 4 radiate onto the metal casing and that the detector 4 receives the returned Lamb wave. The predetermined deflection angle is generally between 10° and 20°. Adjusting the orientation of the detector in S320 can be a fine-tuning process; for example, the detector can be moved within a small range along the X and Y axes.

[0078] In some embodiments, the predetermined deflection angle can be calculated based on the following formula (1):

[0079]

[0080] The propagation speed of ultrasound in water is different from that in a metal casing. Furthermore, ultrasound is refracted when it enters a metal casing from water. When ultrasound is incident at an angle onto the interface, in addition to generating the same type of reflected and refracted waves, different types of reflected and refracted waves are also generated. This phenomenon is called waveform conversion. The relationship between different wave velocities and angles of waveform conversion satisfies the corresponding law of refraction, which is Equation (1).

[0081] In this context, the liquid medium is used as the first medium, and the metal cladding is used as the second medium. Therefore, C... L1 It is the speed at which the longitudinal wave of an ultrasonic wave propagates in a liquid medium; C S1 It is the speed at which the transverse wave of an ultrasonic wave propagates in water; C L2 C is the speed at which the longitudinal wave of an ultrasonic wave propagates within a metal casing. S2 It is the speed at which the transverse wave of an ultrasonic wave propagates within a metal casing; α L Represents the angle of incidence and angle of reflection of the longitudinal wave; α L1 α represents the angle of incidence and the angle of reflection of the longitudinal wave as it propagates in water. S1 β represents the angle of incidence and the angle of reflection of a transverse wave propagating in water; L β represents the angle of refraction of longitudinal waves on the surfaces of water and metal cladding; S It represents the angle of refraction of transverse waves on the surface of water and metal cladding.

[0082] Users can obtain the propagation speed of ultrasound in water and in metal-clad materials through detection or query. Based on the definition of Lamb wave and related technologies, the angular range in which Lamb wave can be excited can be known, and this angular range is taken as the refraction angle of the ultrasound wave. Substituting the above data into formula (1) for calculation, the incident angle that can be used to excite Lamb wave is obtained, that is, the predetermined deflection angle of the detector 4.

[0083] The above methods can scan metal cladding to a wider range of applications, including curved or irregular surfaces, which helps to fully obtain the location of defects with different orientations and the maximum echo height.

[0084] In some embodiments, a reference image can be used to determine whether there are defects in the metal cladding. The reference image can be an image obtained when scanning a metal cladding with multiple pre-defined defects. The scanned image can be compared with the reference image to determine whether there are defects.

[0085] Specifically, a reference cladding can be scanned to obtain a reference image. The reference cladding can be a cladding with the same specifications as the metal cladding to be tested, except that it has multiple pre-set defects formed on it. The specific steps for scanning the reference cladding can refer to the steps for scanning the metal cladding mentioned above, and will not be repeated here.

[0086] After obtaining the reference image, the defect regions corresponding to multiple defects in the reference image can be identified. Then, after scanning the metal cladding to be tested to obtain a scanned image, the scanned image can be compared with the reference image, and the areas in the scanned image that are the same as or similar to the defect regions are identified as the areas where defects exist in the metal cladding.

[0087] In this embodiment, acquiring a reference image serves two purposes: firstly, it allows for a preliminary check of the scanning device's accuracy. For example, if the reference image does not show all defects, the scanning accuracy may be insufficient, requiring appropriate adjustments. Secondly, it also improves the efficiency and accuracy of determining whether the metal casing has defects.

[0088] In some embodiments, a plurality of defects pre-defined on the reference casing include transverse crack defects and / or longitudinal crack defects.

[0089] In some other embodiments, the presence of defects in the metal cladding can be determined directly based on the specific scanned image without the aid of a reference image. For example, the presence of defects in the metal cladding can be determined by the color intensity in the C-scan image.

[0090] The following example demonstrates the effectiveness of the detection device and method described above in detecting a metal casing with multiple pre-set defects, and provides a more detailed description and supplement to the detection method mentioned above.

[0091] Figure 4 This is a schematic diagram of the structure of the metal casing according to an embodiment of this application. Figure 5 yes Figure 4 The diagram shows the scanning state of the metal casing and the detector. Figure 6 yes Figure 5 Enlarged view of point A in the middle.

[0092] In this embodiment, the metal cladding 3 is an iridium alloy metal cladding, such as... Figure 4 As shown, several transverse and longitudinal cracks are pre-set on the inner and outer surfaces of the metal shell 3. The defect information of the metal shell 3 is shown in Table 1 below.

[0093] Table 1. Defect information of iridium alloy metal reference cladding

[0094]

[0095]

[0096] As shown in Table 1, the iridium alloy metal cladding has a height of 29 mm, a diameter of 29 mm, and a wall thickness of 0.7 mm. The iridium alloy metal cladding standard sample has 13 prefabricated defects, including 4 transverse cracks and 9 longitudinal cracks. The groove width is 0.102 mm, the length is 1.27 mm, and the groove depth ranges from a minimum of 0.076 mm to a maximum of 0.203 mm.

[0097] In this embodiment, as Figure 5 and Figure 6 As shown, the predetermined position is set at the edge where the upper surface of the metal shell 3 intersects with the sidewall. It is known from the test that the speed of sound in water is 1480 m / s and the speed of sound in iridium is 5305 m / s. The predetermined deflection angle is denoted as ∠a. The predetermined deflection angle ∠a = 16° can be calculated by formula (1).

[0098] Next, the orientation of the probe 4 was adjusted to deflect it to a value greater than 16°. The scanning orientation and initial position were determined based on the intensity of the received Lamb wave, and the scanning path was determined based on the initial position, thus completing the scan. The scanning parameters of the probe 4 used during the scan were: scanning step 2°, scanning speed 5 rpm, and scanning axis step 0.2 mm.

[0099] The images obtained from this scan accurately show the location of each defect and find all pre-fabricated defects, indicating that the detection device and detection method provided in this application embodiment have high accuracy in detecting defects.

[0100] The embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. It should be noted that implementations not illustrated or described in the drawings or the main text of the specification are forms known to those skilled in the art and have not been described in detail. Furthermore, the definitions of the various components described above are not limited to the specific structures, shapes, or methods mentioned in the embodiments, and those skilled in the art can easily modify or substitute them.

[0101] It should also be noted that, in the specific embodiments of this disclosure, unless otherwise stated otherwise, the numerical parameters in this specification and the appended claims are approximate values ​​and can be changed according to the desired characteristics obtained from the content of this disclosure. Specifically, all numbers used in the specification and claims to indicate dimensions, range conditions, etc., of the composition should be understood to be modified by the term "about" in all cases. Generally, this means that there may be variations of ±10% in some embodiments, ±5% in some embodiments, ±1% in some embodiments, and ±0.5% in some embodiments.

[0102] Those skilled in the art will understand that the features described in the various embodiments and / or claims of this application can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in this application. In particular, the features described in the various embodiments and / or claims of this application can be combined or combined in various ways without departing from the spirit and teachings of this application. All such combinations and / or combinations fall within the scope of this application.

[0103] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above descriptions are merely specific embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A detection device suitable for metal cladding, comprising: a housing, in which a detection space suitable for containing a liquid medium is formed; a rotating member installed in the housing, configured to support and rotate the metal cladding; a moving member installed to the housing, configured to move relative to the rotating member; a probe member installed on the moving member and immersed in the liquid medium, configured to emit ultrasonic waves toward the metal cladding immersed in the liquid medium to excite the metal cladding to form Lamb waves, and receive the Lamb waves; and a processor for controlling the probe member to emit the ultrasonic waves, and obtaining a scan image based on the Lamb waves, which is used to determine whether the metal cladding has defects; the rotating member comprises a base rotatably installed at the bottom of the housing around a first axis extending in a first direction; the moving member is configured to move in the first direction, a second direction perpendicular to the first direction, and a third direction perpendicular to the first and second directions relative to the base under the control of the processor; the moving member comprises: a moving base horizontally installed on the housing and configured to move linearly in the second direction at the upper portion of the housing; a column, a lower end of which is installed on the moving base and configured to move linearly in the third direction relative to the moving base; a moving block installed on the column and configured to lift and lower relative to the column in the first direction; and a connecting rod installed on the moving block, a lower end of which is installed with the probe member. the rotating member further comprises:

2. The detection device of claim 1, wherein, a plurality of locking structures configured to position the metal cladding on the base such that the geometric center of the metal cladding is located on the first axis. the base is provided with a plurality of sets of limiting grooves extending radially, 3. The detection device of claim 2, wherein, each of the locking structures comprises: a sliding block radially slidably combined with a set of the limiting grooves; and a locking member installed on the sliding block, by operating which the sliding block can be allowed or prevented from sliding relative to the limiting grooves, so that the metal cladding can be positioned on or removed from the base. 4.The detection device according to claim 3, the moving member further comprising: a first turning mechanism rotatably installed at the lower end of the connecting rod around a second axis extending in the third direction; and a second turning mechanism rotatably installed on the first turning mechanism around a third axis extending in the second direction, the probe member being installed on the second turning mechanism. 5.A method for detecting metal cladding using the detection device according to any one of claims 1-4, comprising: ； S100: fixing the metal cladding on the rotating member; S200: flushing the liquid medium in the detection space, and adjusting the moving member so that the probe member is immersed in the liquid medium; ​ ​ S300: selecting an initial position on the metal cladding and a scanning posture of the probe; S400: controlling at least one of the moving member and the rotating member to move and keep the scanning posture of the probe, so that the probe and the metal cladding move relative to each other from the initial position to obtain a scanning image; and S500: determining whether the metal cladding has defects based on the scanning image.

6. The method of claim 5, wherein, The selecting of the initial position on the metal cladding and the determining of the scanning posture of the probe include: S310: adjusting the posture of the probe by adjusting the moving member, so that the ultrasonic wave emitted by the probe is at a predetermined position on the metal cladding, and the deflection angle of the radiation axis of the probe relative to the normal of the plane tangent to the predetermined position is a predetermined deflection angle; S320: continuing to adjust the posture of the probe and monitoring the intensity of the received Lamb wave; S330: determining the position of the ultrasonic wave emitted by the probe on the metal cladding when the intensity of the received Lamb wave is the largest as the initial position, and determining the posture of the probe at this time as the scanning posture.

7. The method of claim 6, further comprising: scanning a reference cladding to obtain a reference image, the reference cladding being formed with a plurality of defects set in advance; determining defect regions in the reference image corresponding to the plurality of defects; the determining whether the metal cladding has defects based on the scanning image including: comparing the scanning image with the reference image, and determining a region in the scanning image same as or similar to the defect region as a region in which the metal cladding has defects.

8. The method of claim 7, wherein, The plurality of defects include transverse crack defects and / or longitudinal crack defects.

9. The method of claim 6, wherein, The predetermined position is an edge of an intersection position of an upper surface and a side wall of the metal cladding.

Images