Nondestructive testing equipment for cracks of metal material

Abstract

Nondestructive testing equipment for metal material cracks comprises a supporting frame, the supporting frame is provided with a clamping mechanism used for clamping the two ends of a pipe workpiece, the clamping mechanism comprises a first clamping piece and a second clamping piece which are arranged on the two opposite sides of the supporting frame, the first clamping piece can rotate along the axis of the first clamping piece, and the second clamping piece can linearly move in the axis direction of the second clamping piece; a fluorescent magnetic powder spray head located above the clamping mechanism is further arranged in the supporting frame, and a spray opening of the fluorescent magnetic powder spray head faces the pipe workpiece. An ultraviolet lamp is further arranged on one side of the upper portion of the clamping mechanism. The first clamping piece can drive the clamped pipe workpiece to rotate, fluorescent magnetic powder sprayed by the fluorescent magnetic powder spraying head is sprayed to the surface of the pipe workpiece rotating slowly, the fluorescent magnetic powder can emit fluorescent light under ultraviolet light, cracks and defects are more obvious and visible, and the service life of the pipe workpiece is prolonged. The crack detection can be carried out on the pipe workpiece under the condition that the pipe workpiece is not disassembled, redundant fluorescent magnetic powder does not need to be manually cleaned, and the crack detection efficiency of the pipe workpiece is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of metal material detection, in particular to a nondestructive detection device for cracks in metal materials. Background Art

[0002] During the production process, metal workpieces will inevitably have defects such as scratches or cracks, and the surface of the workpiece needs to be inspected by a detection device. For example, the existing patent number CN210071690U is a metal casting surface flaw detection clamping detection device, which discloses a device for spraying fluorescent magnetic powder onto the surface of the casting to detect surface cracks of the casting. However, the flaw detection clamping detection device can only detect surface cracks on the upper end face of the casting. When cracks on other surfaces need to be detected, the placement of the casting needs to be disassembled and replaced. Especially for the detection of the surface of pipe castings, it is impossible to quickly spray fluorescent magnetic powder on the surface of the pipe casting for irradiation detection. Utility Model Content

[0003] In order to solve the technical problems existing in the above-mentioned background technology, the utility model provides a non-destructive detection device for cracks in metal materials.

[0004] The technical solution of this utility model is as follows:

[0005] A nondestructive testing device for cracks in metal materials, comprising a support frame, a clamping mechanism for clamping two ends of a pipe workpiece is provided at the lower part of the support frame, the clamping mechanism comprises a first clamping piece and a second clamping piece arranged at opposite sides of the support frame, the first clamping piece and the second clamping piece are both conical pieces, and the axes coincide with each other, both have cone tips, the two cone tips are arranged oppositely, the first clamping piece can rotate along its axis, the end of the second clamping piece away from the first clamping piece is rotatably connected to a lateral movement device, and the second clamping piece can move linearly along its axis direction;

[0006] The support frame is also provided with a fluorescent magnetic powder spray head located above the clamping mechanism, the fluorescent magnetic powder spray head is connected to an external fluorescent magnetic powder tank through a pipeline, and the spray port of the fluorescent magnetic powder spray head is arranged toward the pipe workpiece;

[0007] An ultraviolet lamp is also arranged on one side above the clamping mechanism.

[0008] The first clamping member and the second clamping member are relatively arranged on both sides of the middle and lower part of the support frame, one end of the pipe workpiece is sleeved on the first clamping member, and the second clamping member is moved to the other end of the pipe workpiece by the transverse movement device. The first clamping member and the second clamping member can clamp the pipe workpiece, and the first clamping member and the second clamping member are both tapered members, which can clamp pipe workpieces of different diameters and lengths;

[0009] The first clamping member can rotate around its axis, and the second clamping member can be rotatably connected to the transverse movement device, so as to achieve the effect that the pipe workpiece can rotate. The fluorescent magnetic powder nozzle is arranged above the pipe workpiece, and the fluorescent magnetic powder nozzle sprays fluorescent magnetic powder to the slowly rotating pipe workpiece. The fluorescent magnetic powder contains fluorescent pigments, so that cracks are visible under ultraviolet light. The magnetic powder penetrates into the surface cracks under the action of the magnetic field, and then the surface of the pipe workpiece is irradiated with an ultraviolet lamp. The fluorescent magnetic powder will fluoresce under ultraviolet light, making the cracks and defects more obvious and visible, thereby achieving the effect of quickly detecting cracks or scratches on the surface of the pipe workpiece. The prior art can only detect the upper end face of the casting, and after spraying the fluorescent magnetic powder, it is necessary to manually clean up the excess fluorescent magnetic powder. The utility model can not only spray fluorescent magnetic powder on the surface of the workpiece without disassembling the workpiece, but also remove the excess fluorescent magnetic powder by rotating the workpiece, thereby reducing the work intensity.

[0010] When the first clamping member drives the tubular workpiece to rotate, if the clamping force is insufficient, the tubular workpiece may not rotate with the first clamping member. To this end, the first clamping member is provided with a first conical surface, and the first conical surface is provided with a magnetic member. One end of the magnetic member is rotatably connected to the first conical surface, and the other end is a connecting end, which is magnetic and can rotate and can move to the inner wall of the tubular workpiece to be magnetically connected thereto. The magnetic member can cooperate with the first clamping member and the second clamping member to further connect the tubular workpiece, so that the tubular workpiece can rotate when driven by the first clamping member.

[0011] If the magnetic attraction part is directly installed on the first conical surface, it may affect the clamping of pipe workpieces with different inner diameters. For this reason, the first conical surface is provided with a mounting groove along its generatrix direction, and the end of the magnetic attraction part away from the connecting end is rotatably set in the mounting groove. The connecting end is a movable end and can swing, and the connecting end can extend relative to the mounting groove.

[0012] Regarding the specific structure of the magnetic attraction member, the magnetic attraction member is in the shape of a long rod, and the end of the magnetic attraction member that can swing is the connecting end. The lower part of the connecting end is elastically connected to the bottom surface of the mounting groove through an elastic member, and the elastic member is a compression spring. Under normal conditions, the compression spring can push the connecting end out of the mounting groove;

[0013] When one end of the tube workpiece is sleeved on the first conical surface of the first clamping member, the compression spring will be pushed downward through the connecting end, the compression spring will be deformed, and the connecting end will also be magnetically attracted to the inner wall of the tube workpiece, thereby fixing the tube workpiece on the first clamping member.

[0014] Regarding the specific installation position of the magnetic element in the installation groove, the bottom surface of the installation groove is an inclined surface, and the inclination angle of the inclined surface is parallel to the inclination angle of the cone generatrix of the first clamping member. The moving plane of the magnetic element coincides with the vertical plane where the axis of the first clamping member is located. Therefore, the end of the magnetic element away from the connecting end is located at the upper end of the inclined surface with a higher position, and the elastic member is vertically arranged at the bottom end of the inclined surface. When disassembling the tubular workpiece, the second clamping member is first moved away from the first clamping member under the drive of the transverse movement device to release one end of the tubular workpiece. By setting the connecting end close to the cone tip position of the first clamping member, when the tubular workpiece is pulled out, the magnetic element will not be stuck on the inner wall of the tubular workpiece, which is convenient for disassembly of the tubular workpiece and separation of the connecting end from the tubular workpiece.

[0015] Regarding the structure for driving the first clamping member to rotate, a driving motor is connected to the side of the first clamping member away from the second clamping member, that is, the end of the first clamping member away from the cone tip is connected to the driving motor, the driving motor has an output shaft, the axis of the output shaft is coaxial with the axis of the first clamping member, the driving motor is installed on one side of the support frame, the driving motor can adjust the rotation speed of the first clamping member, and then adjust the rotation speed of the tube workpiece, when the fluorescent magnetic powder nozzle sprays fluorescent magnetic powder to the tube workpiece, the tube workpiece is controlled to rotate slowly, and after the fluorescent magnetic powder nozzle sprays the surface of the tube workpiece for one circle and stops spraying, the rotation speed of the tube workpiece can be appropriately adjusted to remove excess fluorescent magnetic powder from the surface of the tube workpiece to reduce interference with the detection results.

[0016] To facilitate the connection between the end of the output shaft and the first clamping member, the first clamping member and the output shaft are fixedly connected via a first connecting plate, and a first support plate is provided at the lower end of the first connecting plate in a horizontal direction. The first support plate is located below the first clamping member. The first support plate is horizontally arranged and extends a certain length in the direction close to the second clamping member, so as to support one end of the pipe workpiece close to the first clamping member.

[0017] Regarding the connection structure between the second clamping member and the transverse movement device, a second connecting plate is provided on the side of the second clamping member away from the first clamping member, the transverse movement device can be an electric push rod or a hydraulic push rod, and the transverse movement device has an extension rod, the axis of the extension rod is coaxial with the axis of the second clamping member, and a bearing is provided on the side of the second connecting plate away from the second clamping member, the axis of the bearing is coaxial with the axis of the second clamping member, the extension rod has an extension end, the extension end is connected to the inner ring of the bearing, and the outer ring of the bearing is connected to the second connecting plate, so as to realize the rotational connection between the extension rod and the second connecting plate; a second support plate is provided at the lower end of the second connecting plate in the horizontal direction, which can support the other end of the pipe workpiece, and at the same time, the first support plate and the second support plate are located in the same horizontal plane and cooperate with each other, so as to support products other than pipe workpieces and realize crack detection of products other than pipe workpieces.

[0018] The length of the tubular workpiece is relatively long. If only one fluorescent magnetic powder nozzle is used, the range of spraying fluorescent magnetic powder is limited. Therefore, multiple fluorescent magnetic powder nozzles are provided, and the multiple fluorescent magnetic powder nozzles are evenly spaced and distributed above the tubular workpiece along the axial direction of the first clamping member.

[0019] In order to increase the irradiation range of the ultraviolet lamp on the surface of the tube workpiece or other products and to be able to detect cracks at different angles, two groups of ultraviolet lamps are provided. The two groups of ultraviolet lamps are symmetrically arranged on both sides of the first clamp along the axial direction, so that cracks or defects on the surface of the tube workpiece or other products can be observed on both sides. The height of the ultraviolet lamp is higher than the height of the fluorescent magnetic powder nozzle to avoid the fluorescent magnetic powder sprayed by the fluorescent magnetic powder nozzle being sprayed on the ultraviolet lamp and affecting its use.

[0020] The beneficial effect of the utility model lies in that the first clamping member and the second clamping member are used to clamp the pipe workpiece, the second clamping member can move laterally along its axial direction to clamp the pipe workpiece, the first clamping member can drive the clamped pipe workpiece to rotate, the fluorescent magnetic powder sprayed by the fluorescent magnetic powder nozzle is sprayed on the surface of the slowly rotating pipe workpiece, after a certain period of time, the magnetic powder fully enters the crack, the fluorescent magnetic powder will fluoresce under ultraviolet light, making the cracks and defects more obvious, that is, crack detection of the pipe workpiece is realized without disassembling it, and by controlling the rotation speed of the pipe workpiece, the excess fluorescent magnetic powder can be removed, and there is no need to manually clean the excess fluorescent magnetic powder, thereby improving the efficiency of crack detection of the pipe workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In the attached picture:

[0022] Figure 1 is a cross-sectional view;

[0023] Figure 2 for Figure 1 The enlarged structural diagram at A in the middle;

[0024] Figure 3 for Figure 1 The enlarged structural diagram at B in the middle;

[0025] Figure 4 It is a stereogram;

[0026] Figure 5 for Figure 4 Right view of;

[0027] The components represented by the reference numerals in the figure are:

[0028] 1. Support frame; 2. First clamping member; 21. First conical surface; 22. Mounting groove; 3. Driving motor; 31. Output shaft; 4. First connecting plate; 5. First supporting plate; 6. Second clamping member; 7. Transverse movement device; 71. Extending rod; 8. Second connecting plate; 9. Second supporting plate; 10. Fluorescent magnetic powder nozzle; 11. Pipe; 12. Ultraviolet lamp; 13. Magnetic member; 14. Connecting end; 15. Elastic member; 16. Bearing; 17. Tube workpiece; 18. Collection box. DETAILED DESCRIPTION

[0029] like Figure 1 and Figure 4 A nondestructive detection device for cracks in metal materials is shown, comprising a support frame 1, a clamping mechanism for clamping two ends of a tube workpiece 17 is provided at the lower part of the support frame 1, the clamping mechanism comprises a first clamping member 2 and a second clamping member 6 arranged on opposite sides of the support frame 1, the first clamping member 2 and the second clamping member 6 can clamp the tube workpiece 17, a fluorescent magnetic powder nozzle 10 is also provided in the support frame 1 and is located above the clamping mechanism, the fluorescent magnetic powder nozzle 10 is connected to an external fluorescent magnetic powder tank through a pipeline 11, the nozzle of the fluorescent magnetic powder nozzle 10 is arranged toward the tube workpiece 17, an ultraviolet lamp 12 is also provided on one side above the clamping mechanism, after the fluorescent magnetic powder nozzle 10 sprays fluorescent magnetic powder onto the surface of the tube workpiece 17 below, it is irradiated by the ultraviolet lamp 12 to detect cracks on the surface of the tube workpiece 17, a collecting box 18 is provided below the clamping mechanism for collecting the fluorescent magnetic powder after spraying.

[0030] Among them, the first clamping member 2 and the second clamping member 6 are both conical members, and their axes coincide, and both have cone tips, and the two cone tips are arranged opposite to each other. The first clamping member 2 can rotate along its axis, and the second clamping member 6 is rotatably connected to the transverse movement device 7 at one end away from the first clamping member, and the second clamping member 6 can move linearly along its axis direction.

[0031] The first clamping member 2 and the second clamping member 6 are relatively arranged on both sides of the middle and lower part of the support frame 1. One end of the tube workpiece 17 is sleeved on the first clamping member 2. The second clamping member 6 is moved to the other end of the tube workpiece 17 by the transverse movement device 7. The first clamping member 2 and the second clamping member 6 can clamp the tube workpiece 17. The first clamping member 2 and the second clamping member 6 are both conical members, which can clamp the tube workpieces 17 of different diameters and lengths.

[0032] Regarding the structure for driving the first clamping member 2 to rotate, a driving motor 3 is connected to the side of the first clamping member 2 away from the second clamping member, that is, the end of the first clamping member 2 away from the cone tip is connected to the driving motor 3, the driving motor 3 has an output shaft 31, and the axis of the output shaft 31 is coaxial with the axis of the first clamping member 2. The driving motor 3 is installed on one side of the support frame 1. The driving motor 3 can adjust the rotation speed of the first clamping member 2, and then adjust the rotation speed of the tube workpiece 17. When the fluorescent magnetic powder nozzle 10 sprays fluorescent magnetic powder to the tube workpiece 17, the tube workpiece 17 is controlled to rotate slowly. After the fluorescent magnetic powder nozzle 10 sprays the surface of the tube workpiece 17 for one circle and stops spraying, the rotation speed of the tube workpiece 17 can be appropriately adjusted to remove excess fluorescent magnetic powder from the surface of the tube workpiece 17 to reduce interference with the detection result.

[0033] like Figure 3 As shown, regarding the connection structure between the second clamping member 6 and the transverse movement device 7, a second connecting plate 8 is provided on the side of the second clamping member 6 away from the first clamping member, the transverse movement device 7 can be an electric push rod or a hydraulic push rod, and the transverse movement device 7 has an extension rod 71, and the axis of the extension rod 71 is coaxial with the axis of the second clamping member 6. A bearing 16 is provided on the side of the second connecting plate 8 away from the second clamping member 6, and the axis of the bearing 16 is coaxial with the axis of the second clamping member 6. The extension rod 71 has an extension end, which is connected to the inner ring of the bearing 16, and the outer ring of the bearing 16 is connected to the second connecting plate 8, so as to realize the rotational connection between the extension rod 71 and the second connecting plate 8.

[0034] In the above structure, the beneficial effects of the utility model are as follows: the first clamping member can rotate around its axis, and the second clamping member 6 can be rotatably connected to the transverse movement device 7, so as to achieve the effect that the tube workpiece 17 can rotate. Through the fluorescent magnetic powder nozzle 10 arranged above the tube workpiece 17, the fluorescent magnetic powder nozzle 10 sprays fluorescent magnetic powder to the slowly rotating tube workpiece 17. The fluorescent magnetic powder contains fluorescent pigments, so that cracks are visible under ultraviolet light. The magnetic powder penetrates into the surface cracks under the action of the magnetic field, and then the surface of the tube workpiece 17 is irradiated by the ultraviolet lamp 12. The fluorescent magnetic powder will emit fluorescence under ultraviolet light, making the cracks and defects more obvious and visible, thereby achieving the effect of quickly detecting cracks or scratches on the surface of the tube workpiece 17. The prior art can only detect the upper end face of the casting, and after spraying the fluorescent magnetic powder, it is necessary to manually clean up the excess fluorescent magnetic powder. The utility model can not only spray fluorescent magnetic powder on the surface of the workpiece without disassembling the workpiece, but also remove the excess fluorescent magnetic powder by rotating the workpiece, thereby reducing the work intensity.

[0035] like Figure 2As shown, when the first clamping member 2 drives the tube workpiece 17 to rotate, if the clamping force is insufficient, the tube workpiece 17 may not rotate with the first clamping member 2. For this reason, the first clamping member 2 is provided with a first conical surface 21, and the first conical surface 21 is provided with a magnetic attraction member that can be magnetically attracted to the inner wall of the tube workpiece 17. The magnetic attraction member can cooperate with the first clamping member 2 and the second clamping member 6 to further connect the tube workpiece 17, so that the tube workpiece 17 can rotate under the drive of the first clamping member 2.

[0036] If the magnetic element is directly mounted on the first conical surface 21, it may affect the clamping of pipe workpieces 17 with different inner diameters. Therefore, the first conical surface 21 is provided with a mounting groove 22, and the magnetic element is elastically arranged in the mounting groove 22 through the elastic element 15. The magnetic end of the magnetic element can be lifted to the outside of the first conical surface 21 when the elastic element 15 is not compressed. This embodiment is provided with two sets of symmetrically arranged magnetic elements 13, so two symmetrical mounting grooves 22 are provided. (See Figure 1 and Figure 2 )

[0037] Regarding the specific structure of the magnetic member, the magnetic member 13 is a long rod, and the connecting end 14 is arranged at one end of the magnetic member 13. The connecting end 14 is a magnet, which has magnetism and can be magnetically connected to the inner wall of the pipe casting. The end of the magnetic member 13 away from the connecting end 14 is rotatably arranged in the installation groove 22. The lower part of the connecting end 14 is elastically connected to the bottom surface of the installation groove 22 through an elastic member 15. The elastic member 15 is a compression spring. Under normal conditions, the compression spring can push the connecting end 14 out of the installation groove 22. When disassembling the pipe workpiece 17, the second clamping member 6 is first moved away from the first clamping member under the drive of the transverse movement device 7 to release one end of the pipe workpiece 17. By setting the magnetic member 13 with one end of the connecting end 14 close to the cone tip position of the first clamping member, when the pipe workpiece 17 is pulled out, the magnetic member 13 will not be stuck on the inner wall of the pipe workpiece 17, which is convenient for disassembling the pipe workpiece 17 and separating the connecting end 14 from the pipe workpiece 17.

[0038] When one end of the tube workpiece 17 is sleeved on the first conical surface 21 of the first clamping member 2, the compression spring will be pushed downward through the connecting end 14, the compression spring will deform, and the connecting end 14 will be magnetically attracted to the inner wall of the tube workpiece 17, thereby fixing the tube workpiece 17 on the first clamping member.

[0039] The specific structure of the above-mentioned installation groove 22 is that the bottom surface of the installation groove 22 is an inclined surface, the inclination angle of the inclined surface is parallel to the inclination angle of the cone generatrix of the first clamping member 2, and the elastic member 15 is vertically arranged at the bottom end of the inclined surface to facilitate the installation of the compression spring. (See Figure 2 )

[0040] In order to facilitate the connection between the end of the output shaft 31 and the first clamping member 2, the first clamping member 2 and the output shaft 31 are fixedly connected by a first connecting plate 4, and a first supporting plate 5 is provided at the lower end of the first connecting plate 4 in a horizontal direction. The first supporting plate 5 is located below the first clamping member 2. The first supporting plate 5 is horizontally arranged and extends a certain length toward the direction close to the second clamping member 6, so as to support one end of the pipe workpiece 17 close to the first clamping member; a second supporting plate 9 is provided at the lower end of the second connecting plate 8 in a horizontal direction, so as to support the other end of the pipe workpiece 17. At the same time, the first supporting plate 5 and the second supporting plate 9 are located in the same horizontal plane and cooperate with each other, so as to support products other than the pipe workpiece 17 and also realize crack detection of products other than the pipe workpiece 17.

[0041] The length of the tube workpiece 17 is relatively long. If only one fluorescent magnetic powder nozzle 10 is used, the range of spraying fluorescent magnetic powder is limited. Therefore, multiple fluorescent magnetic powder nozzles 10 are provided, and the multiple fluorescent magnetic powder nozzles 10 are evenly spaced and distributed directly above the tube workpiece 17 along the axial direction of the first clamping member.

[0042] like Figure 5 As shown, in order to increase the irradiation range of the ultraviolet lamp 12 on the surface of the tube workpiece 17 or other products and to detect cracks at different angles, two groups of ultraviolet lamps 12 are provided, and the two groups of ultraviolet lamps 12 are symmetrically arranged on both sides of the first clamping member along the axial direction, so that cracks or defects on the surface of the tube workpiece 17 or other products can be observed on both sides. The height of the ultraviolet lamp 12 is higher than the height of the fluorescent magnetic powder nozzle 10, so as to avoid the fluorescent magnetic powder sprayed by the fluorescent magnetic powder nozzle 10 from being sprayed on the ultraviolet lamp 12 and affecting its use.

Claims

1. A non-destructive testing device for cracks in metal materials, characterized in that: The invention comprises a support frame (1), wherein a clamping mechanism for clamping two ends of a pipe workpiece (17) is provided at the lower part of the support frame (1), wherein the clamping mechanism comprises a first clamping member (2) and a second clamping member (6) arranged on opposite sides of the support frame (1), wherein the first clamping member (2) and the second clamping member (6) are both conical members, and their axes coincide with each other, and both have cone tips, and the two cone tips are arranged opposite to each other, and the first clamping member (2) can rotate along its axis, and the second clamping member (6) is rotatably connected to a transverse movement device (7) at one end away from the first clamping member, and the second clamping member (6) can move linearly along its axis direction; The support frame (1) is also provided with a fluorescent magnetic powder spray head (10) located above the clamping mechanism, the fluorescent magnetic powder spray head (10) is connected to an external fluorescent magnetic powder tank through a pipeline (11), and the spray port of the fluorescent magnetic powder spray head (10) is arranged toward the pipe workpiece (17); An ultraviolet lamp (12) is also provided on one side above the clamping mechanism.

2. The nondestructive testing device for cracks in metal materials according to claim 1, characterized in that: The first clamping member (2) has a first conical surface (21), and the first conical surface (21) is provided with a magnetic attraction member (13). One end of the magnetic attraction member (13) is rotatably connected to the first conical surface (21), and the other end is a connecting end (14) having magnetism.

3. The nondestructive testing device for metal material cracks according to claim 2, characterized in that: The first conical surface (21) is provided with a mounting groove (22) along its generatrix direction, and one end of the magnetic attraction member (13) away from the connecting end (14) is rotatably arranged in the mounting groove (22), and the connecting end (14) can extend outward relative to the mounting groove (22).

4. The nondestructive testing device for cracks in metal materials according to claim 3, characterized in that: The lower part of the connection end (14) is elastically connected to the bottom surface of the installation groove (22) via an elastic member (15).

5. The nondestructive testing device for cracks in metal materials according to claim 3, characterized in that: The moving plane of the magnetic attraction member (13) coincides with the vertical plane where the axis of the first clamping member (2) is located.

6. The nondestructive testing device for cracks in metal materials according to claim 1, characterized in that: A drive motor (3) is connected to the side of the first clamping member (2) away from the second clamping member.

7. The nondestructive testing device for cracks in metal materials according to claim 6, characterized in that: The first clamping member (2) and the output shaft (31) are connected via a first connecting plate (4), and a first supporting plate (5) is provided at the lower end of the first connecting plate (4) in a horizontal direction.

8. The nondestructive testing device for cracks in metal materials according to claim 7, characterized in that: A second connecting plate (8) is provided on a side of the second clamping member (6) away from the first clamping member, the second connecting plate (8) is rotatably connected to the transverse movement device (7), and a second supporting plate (9) is provided at the lower end of the second connecting plate (8) in a horizontal direction.

9. The nondestructive testing device for cracks in metal materials according to claim 1, characterized in that: A plurality of fluorescent magnetic powder spray heads (10) are provided, and the plurality of fluorescent magnetic powder spray heads (10) are distributed directly above the tubular workpiece (17) along the axial direction of the first clamping member.

10. The nondestructive testing device for cracks in metal materials according to claim 9, characterized in that: Two groups of ultraviolet lamps (12) are provided, and the two groups of ultraviolet lamps (12) are symmetrically arranged on both sides of the first clamping member along the axial direction. The height of the ultraviolet lamps (12) is higher than the height of the fluorescent magnetic powder spray head (10).

Images