A material defect detector

Abstract

The application provides a material defect detector, and belongs to the technical field of material defect detection equipment. The material defect detector comprises a support structure, an infrared camera and two groups of heating sources. The infrared camera and the two groups of heating sources are both mounted on the support structure. The support structure comprises a support frame and an angle adjusting mechanism mounted on the support frame. The angle adjusting mechanism is provided with a sliding piece linearly sliding along the support frame. The two groups of heating sources are symmetrically arranged on the two sides of the sliding track of the sliding piece. The angle adjusting mechanism further comprises two connecting rods matched with the two groups of heating sources. One end of each connecting rod is hingedly connected with the sliding piece, and the other end of each connecting rod is hingedly connected with the corresponding heating source. The heating source is hingedly connected with the support frame. The sliding of the sliding piece drives the adjustment of the angle between the two heating sources, so that the intersection of the emission paths of the two heating sources is aligned with the to-be-detected position of the detected object. The material defect detector is suitable for different distances between the detected object and the detection equipment and is suitable for the defect detection of special-shaped products.

Description

Technical Field

[0001] This application belongs to the technical field of material defect detection equipment, and more specifically, relates to a material defect detection instrument. Background Technology

[0002] Material defect detection is a crucial step in ensuring product quality. Infrared detection is one of the important methods. For example, CN212693652U (publication date: March 12, 2021) discloses a material surface defect detection mechanism. This mechanism heats the material surface using a heat source, causing the material to emit infrared radiation. Since the temperature field distribution differs between defective and non-defective areas, the infrared radiation is captured by a thermal imager, and the analysis terminal processes the data to identify and determine the defects present on the material surface.

[0003] In the aforementioned patented solution, a frame with multiple legs is included. Each leg is connected to a first and second sliding support rod, allowing adjustment of the distance between the heating source / thermal imager and the object being inspected, thus accommodating material inspection at different distances. However, this solution imposes significant limitations on the available space, requiring sufficient room to accommodate the legs and the entire device to be fixed to the material surface using suction cups, thus necessitating certain requirements regarding the surface shape. This makes it difficult to inspect material surfaces, such as aircraft propeller blades or engine crankshafts, where the device cannot be fixed using suction cups. Summary of the Invention

[0004] This invention provides a material defect detector that does not require fixing the detection device to the object being detected, and is applicable to situations where the distance between the object being detected and the detection device varies, making it suitable for defect detection of irregularly shaped materials with complex shapes.

[0005] To achieve the above objectives, the technical solution adopted in this application is: to provide a material defect detector, including a support structure, an infrared camera and two sets of heating sources, wherein the infrared camera and the two sets of heating sources are all installed on the support structure;

[0006] The support structure includes a support frame and an angle adjustment mechanism installed on the support frame. The angle adjustment mechanism is provided with a sliding member that slides linearly along the support frame. Two sets of heating sources are symmetrically arranged on both sides of the sliding trajectory of the sliding member. An infrared camera is located on the symmetrical plane of the two sets of heating sources. The receiving end of the infrared camera and the emitting end of the two sets of heating sources are arranged facing the same side.

[0007] The angle adjustment mechanism also includes two connecting rods that are respectively matched with two sets of heating sources. One end of the connecting rod is hinged to the sliding member, and the other end of the connecting rod is hinged to the corresponding heating source. The heating source is hinged to the support frame. The hinge point between the heating source and the connecting rod is spaced apart from the hinge point between the heating source and the support frame.

[0008] Optionally, the angle adjustment mechanism includes a lead screw motor mounted on the support frame, the lead screw motor being screwed onto a nut seat, the nut seat serving as a sliding element, and the extension direction of the lead screw motor serving as the sliding trajectory of the sliding element.

[0009] Optionally, it also includes a rangefinder arranged in parallel with the infrared camera, the rangefinder being oriented in the same direction as the infrared camera, and the rangefinder being signal-connected to the lead screw motor.

[0010] Optionally, a color industrial camera is also included, positioned in parallel with the infrared camera, with the color industrial camera facing the same direction as the infrared camera.

[0011] Optionally, it also includes an analysis terminal, with an infrared camera, an angle adjustment mechanism, and two sets of heating sources all connected to the analysis terminal.

[0012] Optionally, the heating source is a heating lamp, which includes a housing, a connecting rod, and a support frame, all of which are hinged to the housing;

[0013] The housing contains a halogen bulb, a Fresnel lens, a first convex lens, a light shield, and a second convex lens, which are installed sequentially inside the housing. The second convex lens is located at the emitting end of the heating source. The halogen bulb is covered with a condenser lamp cover with its opening facing the Fresnel lens. The housing contains a dimming hole located at the focal point of the first convex lens. The dimming hole is located between the first convex lens and the light shield. The light shield can block or open the light path by moving.

[0014] The light emitted by the halogen bulb is reflected and focused by the spotlight cover, then passes through the Fresnel lens to form parallel light, which is then focused by the first convex lens and passes through the dimming hole. Finally, the second convex lens adjusts the light back to be parallel light before it is emitted.

[0015] Optionally, the light shield includes a light shield plate, a push-pull electromagnet, and a return spring; the push-pull electromagnet and the return spring are located on opposite sides of the light path emitted by the halogen bulb.

[0016] The push-pull electromagnet is connected to the housing. The telescopic end of the push-pull electromagnet is equipped with a motion connector. The extension direction of the telescopic end of the push-pull electromagnet is perpendicular to the direction of the light path. A reversing wheel is provided on the motion connector. A reversing belt is wound on the reversing wheel. One end of the reversing belt is connected to one edge of the light shield, and the other end of the reversing belt is connected to the housing.

[0017] One end of the return spring is connected to the edge of the light shield away from the reversing belt, and the other end of the return spring is connected to the housing. The push-pull electromagnet and the return spring respectively drive the light shield to move, so that the light shield blocks or opens the light path.

[0018] Optionally, the motion connector is L-shaped and includes a first sidewall and a second sidewall whose edges are connected to each other; the first sidewall is connected to the telescopic end of the push-pull electromagnet, and the light shield abuts against the second sidewall.

[0019] Optionally, the portions of the commutator belt located on both sides of the commutator wheel are parallel to each other.

[0020] Optionally, the dimming hole is a square hole.

[0021] The advantages of the technical solution in this application compared to the prior art are as follows:

[0022] By sliding the slider, the angle between the two heating sources can be adjusted via the connecting rod. Since the heated portion of the object being inspected is located at the intersection of the emission paths of the two heating sources, adjusting the angle allows for adjustment of the distance between this intersection and the heating sources and the infrared camera, accommodating situations where the distance between the object and the inspection device varies. Furthermore, since there is no need to fix the inspection device to the object, no specific fixing structure is required, making it suitable for irregularly shaped products that are difficult to fix together. The intersection of the emission paths of the two heating sources can be adjusted via the angle adjustment mechanism to align the intersection with the surface of the object being inspected. Pre-adjusting the intersection position before inspection ensures accuracy, eliminating the need for a connection for position fixing. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, 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 of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a diagram showing the operational status of a material defect detector.

[0025] Figure 2 This is a schematic diagram of the structure of a material defect detector;

[0026] Figure 3 This is a schematic diagram of the external structure of the heating source;

[0027] Figure 4 This is a schematic diagram of the internal structure of the heating source;

[0028] Figure 5 A schematic diagram of the structure when a light shield blocks the path of light;

[0029] Figure 6 A schematic diagram of the structure when a light shield avoids the path of light;

[0030] Figure 7 for Figure 5 Left view;

[0031] Figure 8 for Figure 6 Left view;

[0032] Figure 9 This is a schematic diagram of the motion connector and the light shield.

[0033] Figure 10 This is a schematic diagram of the sunshade structure when the portions of the commutator belt on both sides of the commutator wheel are parallel to each other.

[0034] Icons: 100. Object being detected; 1. Infrared camera; 2. Heating source; 3. Support frame; 4. Sliding component; 5. Connecting rod; 6. Lead screw motor; 7. Rangefinder; 8. Color industrial camera; 9. Analysis terminal; 10. Housing; 11. Halogen bulb; 12. Fresnel lens; 13. First convex lens; 14. Light shield; 15. Second convex lens; 16. Spotlight cover; 17. Dimming hole; 18. Light shield; 19. Push-pull electromagnet; 20. Return spring; 21. Motion connector; 22. Reversing wheel; 23. Reversing belt; 24. First side wall; 25. Second side wall; 26. Clearance opening; 27. Connecting platform. Detailed Implementation

[0035] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0036] It should be noted that when a component is referred to as being "fixed" or "set" to another component, it can be directly or indirectly attached to that other component. When a component is referred to as being "connected" to another component, it can be directly or indirectly connected to that other component.

[0037] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0038] Example:

[0039] This embodiment provides a material defect detector, based on... Figure 1 and Figure 2 As shown, the system includes a support structure, an infrared camera 1, and two sets of heating sources 2, all mounted on the support structure. The two sets of heating sources 2 are used to heat the object 100 being inspected. The infrared radiation generated by the heated object 100 is received by the infrared camera 1. The location, size, shape, and depth of defects in the object 100 are determined based on the infrared radiation received by the infrared camera 1. The support structure includes a support frame 3 and an angle adjustment mechanism mounted on the support frame 3. The angle adjustment mechanism has a sliding member 4 that slides linearly along the support frame 3. The two sets of heating sources 2 are symmetrically arranged on both sides of the sliding path of the sliding member 4. The infrared camera 1 is located on the symmetrical plane of the two sets of heating sources 2, with the receiving end of the infrared camera 1 and the emitting end of the two sets of heating sources 2 facing the same side. The angle adjustment mechanism also includes two connecting rods 5, each corresponding to one of the two sets of heating sources 2. One end of each connecting rod 5 is hinged to the sliding member 4, and the other end is hinged to the corresponding heating source 2. The heating source 2 is hinged to the support frame 3. The hinge joint between the heating source 2 and the connecting rod 5 is spaced apart from the hinge joint between the heating source 2 and the support frame 3. At this time, the heating source 2, the connecting rod 5 and the support frame 3 form a triangular mechanism.

[0040] In this embodiment, based on Figure 2As shown, the hinge point between the connecting rod 5 and the heating source 2 is located away from the emitting end of the heating source 2, while the hinge point between the heating source 2 and the support frame 3 is located close to the emitting end of the heating source 2. When the sliding member 4 slides along the support frame 3, the heating source 2 rotates around its hinge point with the support frame 3 as the center of rotation, thereby adjusting the angle between the two heating sources 2. In actual use, the object to be heated is located at the intersection of the extending directions of the emitting ends of the two heating sources 2. The two heating sources 2 heat the part of the object 100 to be detected. By sliding the sliding member 4, the angle between the two heating sources 2 can be adjusted by the connecting rod 5, thereby adjusting the distance between the intersection point and the heating source 2 and the infrared camera 1, which is suitable for situations where the distance between the object 100 and the detection device is different. When the sliding member 4 moves downward, the distance between the heated position and the heating source 2 and the infrared camera 1 decreases. When the sliding member 4 moves upward, the distance between the heated position and the heating source 2 and the infrared camera 1 increases. Theoretically, the detection distance can be increased indefinitely, but considering energy attenuation and the detection accuracy of the infrared camera 1, the detection distance is generally limited to no more than 10 meters. Furthermore, since there is no need to fix the detection device to the object being inspected 100, no specific fixing structure is required, making it suitable for irregularly shaped products that are difficult to fix together. During use, the intersection of the emission paths of the two heating sources 2 can be adjusted via an angle adjustment mechanism to align the intersection with the surface of the object being inspected 100. Pre-adjusting the intersection position before inspection ensures accuracy, eliminating the need for a connection for position fixing. This material defect detector can be applied to the economical and efficient inspection of defects in aircraft propeller blades, fighter jet skin, engine crankshafts, internal "missing material" defects in composite materials, and microscopic defects in large engine crankshafts and connecting rods 5.

[0041] In other embodiments, the hinge point between the connecting rod 5 and the heating source 2 can be positioned close to the emitting end of the heating source 2, while the hinge point between the heating source 2 and the support frame 3 can be positioned away from the emitting end of the heating source 2 (not shown in the attached figures). The rotation of the heating source 2 can also be achieved by moving the sliding member 4 up and down.

[0042] Furthermore, in this embodiment, based on Figure 2 As shown, the angle adjustment mechanism includes a lead screw motor 6 mounted on the support frame 3. The lead screw motor 6 is screwed with a nut seat, which serves as a sliding member 4. The extension direction of the lead screw motor 6 serves as the sliding trajectory of the sliding member 4. In other embodiments, the lead screw motor 6 can be replaced by a push rod (not shown in the figure), and the sliding member 4 is mounted on the extension end of the push rod to achieve movement.

[0043] Furthermore, based on Figure 2As shown, the system also includes a rangefinder 7 arranged in parallel with the infrared camera 1. The rangefinder 7 faces the same direction as the infrared camera 1 and is connected to the lead screw motor 6 via a signal connection. The rangefinder 7 can be mounted on the support frame 3 or on the outer wall of the infrared camera 1, as long as it is relatively fixed relative to the infrared camera 1. The rangefinder 7 is used to detect the distance between the object 100 being inspected and the material defect detector. The signal can be used by a PLC or similar device to automatically control the lead screw motor 6 to align the intersection of the two heating sources 2 with the back side position. Additionally, the system includes a color industrial camera 8 arranged in parallel with the infrared camera 1. The color industrial camera 8 faces the same direction as the infrared camera 1 and can also be mounted on the support frame 3 or on the outer wall of the infrared camera 1, as long as it is relatively fixed relative to the infrared camera 1. The color industrial camera 8 is used to record images of the inspected location for convenient and intuitive observation of defects. Furthermore, the system includes an analysis terminal 9, to which the infrared camera 1, the angle adjustment mechanism, the two sets of heating sources 2, and the color industrial camera 8 are all connected. The analysis terminal 9 can be a PC, or the analysis terminal 9 in a material surface defect detection mechanism disclosed in CN212693652U (publication date: 2021.03.12), to analyze the detection data and acquire detection images, etc.

[0044] Furthermore, based on Figure 3 and Figure 4 As shown, the heating source 2 is a heating lamp, which includes a housing 10, a connecting rod 5, and a support frame 3, all hinged to the housing 10. A halogen bulb 11, a Fresnel lens 12, a first convex lens 13, a light shield 14, and a second convex lens 15 are sequentially installed inside the housing 10. The second convex lens 15 is located at the emitting end of the heating source 2. The halogen bulb 11 is covered with a condenser lamp cover 16 with an opening facing the Fresnel lens 12. A dimming hole 17 is provided inside the housing 10 at the focal point of the first convex lens 13. The dimming hole 17 is located between the first convex lens and the light shield 14. The light shield 14 can block or open the light path by moving to control the heating time of the object 100 being tested.

[0045] In use, the light emitted by the halogen bulb 11 is reflected and focused by the condenser lamp cover 16, then passes through the Fresnel lens 12 to form parallel light, which is then focused by the first convex lens 13 and passes through the dimming aperture 17. Finally, the second convex lens 15 adjusts the light back into parallel light before it is emitted. The dimming aperture 17 is preferably square, so that the beam changes from circular to square, better adapting to heating objects with various irregular shapes. In other embodiments, the dimming aperture 17 can also be round or hexagonal. It should be noted that although the dimming aperture 17 is located at the focal point of the first convex lens 13, because the dimming aperture 17 actually has a certain thickness, its end is not strictly at the focal point of the first convex lens 13. The light has a certain cross-sectional area when passing through the dimming aperture 17, which can achieve the purpose of adjusting the shape of the light.

[0046] Furthermore, based on Figures 4 to 8 As shown, the light shield 14 includes a light shield 18, a push-pull electromagnet 19, and a return spring 20. The push-pull electromagnet 19 and the return spring 20 are located on opposite sides of the light path emitted by the halogen bulb 11. The push-pull electromagnet 19 is connected to the housing 10, and a motion connector 21 is installed on the telescopic end of the push-pull electromagnet 19. The extension direction of the telescopic end of the push-pull electromagnet 19 is perpendicular to the direction of the light path. A reversing wheel 22 is provided on the motion connector 21, and a reversing belt 23 is wound around the reversing wheel 22. One end of the reversing belt 23 is connected to one edge of the light shield 18, and the other end of the reversing belt 23 is connected to the housing 10. One end of the return spring 20 is connected to the edge of the light shield 18 away from the reversing belt 23, and the other end of the return spring 20 is connected to the housing 10. The push-pull electromagnet 19 and the return spring 20 respectively drive the light shield 18 to move, so that the light shield 18 blocks or opens the light path.

[0047] In practical use, when the telescopic end of the push-pull electromagnet 19 extends outward to its far end, the light-shielding plate 18 blocks the light path. At this time, the push-pull electromagnet 19 actuates, and its telescopic end drives the light-shielding plate 18 downward. Relying on the characteristics of the reversing wheel 22, with one end of the reversing belt 23 fixed to the housing 10, the end of the reversing belt 23 connected to the light-shielding plate 18 can move at a speed greater than the telescopic speed of the push-pull electromagnet 19, quickly clearing the light path and opening the light path. The smaller the angle α between the portions of the reversing belt 23 on both sides of the reversing wheel 22, the greater the movement speed of the light-shielding plate 18 relative to the telescopic end of the push-pull electromagnet 19, and the faster the action of the light-shielding plate 18. When the angle α between the portions of the reversing belt 23 on both sides of the reversing wheel 22 is zero degrees, i.e., when they are parallel to each other, the movement speed of the light-shielding plate 18 can reach twice the telescopic speed of the push-pull electromagnet 19. The light-shielding plate 18 moves faster than the extension / retraction speed of the push-pull electromagnet 19, thus accelerating its movement response. Similarly, one end of the return spring 20 is connected to the edge of the light-shielding plate 18 away from the reversing belt 23, and the other end is fixed to the housing 10. When the extension / retraction speed of the push-pull electromagnet 19 reverses, the light-shielding plate 18, under the action of the return spring 20, reverses its movement to block the light again. Due to the characteristics of the reversing wheel 22, the speed at which the return spring 20 pulls the light-shielding plate 18 can exceed the extension / retraction speed of the push-pull electromagnet 19, achieving rapid reset and blocking the light path.

[0048] The aforementioned light-shielding device 14 can quickly block or open the light emitted by the light source. The push-pull electromagnet 19 itself has the characteristics of fast response and high stability. Furthermore, through the reversing wheel 22, the light-shielding plate 18 can move at a faster speed than the output end of the push-pull electromagnet 19, greatly reducing the degree of reduction in heating time accuracy caused by the movement of the light-shielding plate 18. When applied in the field of material defect detection, it can ensure the accuracy of heating time control of the heating source 2, improving the accuracy of material defect detection. Testing shows that the light-shielding action of this heating lamp is rapid, completing the action within 5ms, reducing excess light by 90%, and minimizing interference from excess light on the detection results.

[0049] In practical use, based on Figures 5 to 8 As shown, a connecting platform 27 is provided on the edge of the light-shielding plate 18 away from the reversing belt 23, and the end of the return spring 20 is connected to the connecting platform 27. Furthermore, there are two return springs 20 and two connecting platforms 27, located on both sides of the light-shielding plate 18, ensuring pulling stability while preventing the return springs 20 from blocking the light path. Light passes through the portion between the two return springs 20.

[0050] Furthermore, based on Figure 5 and Figure 9 As shown, the motion connector 21 is L-shaped and includes a first sidewall 24 and a second sidewall 25 whose edges are connected to each other. The first sidewall 24 is connected to the telescopic end of the push-pull electromagnet 19, and the light-shielding plate 18 abuts against the second sidewall 25. The motion connector 21 moves along with the telescopic end of the push-pull electromagnet 19. The abutment between the second sidewall 25 and the light-shielding plate 18 can improve the stability of the movement of the light-shielding plate 18. To avoid interference between the first sidewall 24 and the reversing belt 23, a clearance opening 26 can be provided on the first sidewall 24, through which the reversing belt 23 passes.

[0051] Preferably, the portions of the reversing belt 23 located on both sides of the reversing wheel 22 are parallel to each other. In this case, when the speed of the extension end of the push-pull electromagnet 19 is constant, the movement speed of the light shield 18 can reach the maximum, which is twice the movement speed of the extension end of the push-pull electromagnet 19. The action time of the light shield 18 reaches the shortest, and the accuracy of light transmission reaches the maximum.

[0052] In this embodiment, the reversing wheel 22 is a synchronous wheel, and the reversing belt 23 is a synchronous belt that matches the synchronous wheel, so as to avoid sliding friction between the reversing wheel 22 and the reversing belt 23, and to prevent the reversing belt 23 from being worn or even broken.

[0053] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A material defect detector, comprising a support structure, an infrared camera (1) and two sets of heating sources (2), wherein the infrared camera (1) and the two sets of heating sources (2) are all mounted on the support structure; Its features are: The support structure includes a support frame (3) and an angle adjustment mechanism installed on the support frame (3). The angle adjustment mechanism is provided with a sliding member (4) that slides linearly along the support frame (3). Two sets of heating sources (2) are symmetrically arranged on both sides of the sliding trajectory of the sliding member (4). The infrared camera (1) is located on the symmetrical plane of the two sets of heating sources (2). The receiving end of the infrared camera (1) and the emitting end of the two sets of heating sources (2) are arranged facing the same side. The angle adjustment mechanism also includes two connecting rods (5) that are respectively matched with the two sets of heating sources (2). One end of the connecting rod (5) is hinged to the sliding member (4), and the other end of the connecting rod (5) is hinged to the corresponding heating source (2). The heating source (2) is hinged to the support frame (3). The hinge point between the heating source (2) and the connecting rod (5) is spaced apart from the hinge point between the heating source (2) and the support frame (3). The heating source (2) is a heating lamp, which includes a housing (10), and the connecting rod (5) and the support frame (3) are both hinged to the housing (10); The housing (10) is sequentially equipped with a halogen bulb (11), a Fresnel lens (12), a first convex lens (13), a light shield (14), and a second convex lens (15), the second convex lens (15) being located at the emitting end of the heating source (2); the halogen bulb (11) is covered with a slant lamp cover (16) with an opening facing the Fresnel lens (12); the housing (10) is provided with a dimming hole (17) located at the focal point of the first convex lens (13), the dimming hole (17) being located between the first convex lens and the light shield (14), the light shield (14) being able to block or open the light path by movement; The light emitted by the halogen bulb (11) is reflected and focused by the spotlight cover (16), then passes through the Fresnel lens (12) to form parallel light, and is then focused by the first convex lens (13) and passes through the dimming hole (17). Finally, it is adjusted again by the second convex lens (15) to be emitted as parallel light. The light shield (14) includes a light shield (18), a push-pull electromagnet (19), and a return spring (20); the push-pull electromagnet (19) and the return spring (20) are located on both sides of the light path of the light emitted by the halogen bulb (11); The push-pull electromagnet (19) is connected to the housing (10). The telescopic end of the push-pull electromagnet (19) is equipped with a motion connector (21). The telescopic end of the push-pull electromagnet (19) extends perpendicularly to the direction of the light path. A reversing wheel (22) is provided on the motion connector (21). A reversing belt (23) is wound around the reversing wheel (22). One end of the reversing belt (23) is connected to one side edge of the light shield (18). The other end of the reversing belt (23) is connected to the housing (10). One end of the reset spring (20) is connected to the edge of the light shield (18) away from the reversing belt (23), and the other end of the reset spring (20) is connected to the housing (10). The push-pull electromagnet (19) and the reset spring (20) respectively drive the light shield (18) to move, so that the light shield (18) blocks or opens the light path.

2. The material defect detector as described in claim 1, characterized in that: The angle adjustment mechanism includes a lead screw motor (6) installed on the support frame (3), the lead screw motor (6) is screwed with a nut seat, the nut seat serves as the sliding member (4), and the extension direction of the lead screw motor (6) serves as the sliding trajectory of the sliding member (4).

3. The material defect detector as described in claim 2, characterized in that: It also includes a rangefinder (7) arranged in parallel with the infrared camera (1), the rangefinder (7) having the same orientation as the infrared camera (1), and the rangefinder (7) being signal-connected to the lead screw motor (6).

4. The material defect detector as described in claim 1, characterized in that: It also includes a color industrial camera (8) arranged in parallel with the infrared camera (1), the color industrial camera (8) having the same orientation as the infrared camera (1).

5. The material defect detector as described in claim 1, characterized in that: It also includes an analysis terminal (9), wherein the infrared camera (1), the angle adjustment mechanism and the two sets of heating sources (2) are all connected to the analysis terminal (9).

6. The material defect detector as described in claim 1, characterized in that: The motion connector (21) is L-shaped and includes a first sidewall (24) and a second sidewall (25) whose edges are connected to each other; the first sidewall (24) is connected to the telescopic end of the push-pull electromagnet (19), and the light shield (18) abuts against the second sidewall (25).

7. The material defect detector as described in claim 1, characterized in that: The portions of the reversing belt (23) located on both sides of the reversing wheel (22) are parallel to each other.

8. The material defect detector as described in claim 1, characterized in that: The dimming hole (17) is a square hole.

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