Aluminum alloy plate residual stress eddy current testing device

Abstract

The utility model relates to the technical field of aluminum alloy plate eddy current testing, in particular to an aluminum alloy plate residual stress eddy current testing device which comprises a rack, a conveying assembly installed on the rack and positioning assemblies installed on the two sides of the conveying assembly, and an eddy current testing assembly is fixed to the side, close to the positioning assemblies, of the rack. The eddy current detection assembly comprises an adjusting assembly which reciprocates in the X-axis direction, the Y-axis direction and the Z-axis direction, and a first reciprocating mechanism, a second reciprocating mechanism and a third reciprocating mechanism which drive the adjusting assembly to move, a fixing sleeve is fixed to the adjusting assembly, and a first hinge seat is rotationally arranged at the bottom of the fixing sleeve; according to the utility model, an accurate adjusting mechanism is additionally arranged on the reciprocating motion mechanism, so that automatic adjustment can be realized according to the curvature of an aluminum alloy plate, and the influence on the detection accuracy due to an overlarge included angle between the probe and the aluminum alloy plate is avoided.

Description

Technical Field

[0001] This utility model relates to the field of eddy current testing technology for aluminum alloy plates, specifically to a device for detecting residual stress eddy current in aluminum alloy plates. Background Technology

[0002] During the manufacturing and service of aluminum alloy sheets, residual stress is generated inside the sheets due to various process factors (such as heat treatment, cold working, welding, etc.). This residual stress not only reduces the structural strength and fatigue limit of the aluminum alloy sheets, but may also lead to serious accidents such as early fatigue and fracture during use, posing a significant threat to the safe operation of equipment. Therefore, internal stress detection is necessary. Traditional residual stress detection methods mainly include blind hole method, X-ray method, ultrasonic method, and magnetic measurement method. Although these methods can detect residual stress to a certain extent, they all have obvious limitations, such as high cost or complex operation. Given the limitations of traditional detection methods, eddy current testing technology has gradually become a research hotspot in the field of nondestructive testing due to its unique advantages. The principle of eddy current testing technology is to utilize the phenomenon of electromagnetic induction to infer the internal stress state of the test component by measuring the changes in eddy currents within the test component.

[0003] Chinese patent CN216954379U discloses a penetration layer thickness detection device using eddy current technology, belonging to the field of non-destructive testing technology for metal surfaces. It includes a bracket, a positioning support plate, a module slide mechanical drive device, a mounting plate, a detection probe, a cylinder, a positioning pressure plate, a probe protective cover, and a clamping mechanism.

[0004] In the above scheme, the probe can move up and down and horizontally through the mechanical drive device of the module slide, thereby realizing the detection and sampling at any position of the nitriding tube. However, if the aluminum alloy plate to be tested has a certain curvature, and the probe is perpendicular to the curved surface of the aluminum alloy plate, there is a certain angle between the probe and the aluminum alloy plate, which will cause the electromagnetic signal received by the probe to be inaccurate during the test. Utility Model Content

[0005] The purpose of this invention is to provide an aluminum alloy sheet residual stress eddy current detection device that incorporates a precise adjustment mechanism into the reciprocating movement mechanism, which can automatically adjust according to the curvature of the aluminum alloy sheet, avoiding an excessively large angle between the probe and the aluminum alloy sheet, thus affecting the accuracy of the detection.

[0006] To address the problems of existing technologies, this utility model provides a residual stress eddy current testing device for aluminum alloy plates, including a frame, a conveying assembly mounted on the frame, and positioning assemblies mounted on both sides of the conveying assembly. An eddy current testing assembly is fixed to the side of the frame near the positioning assembly. The eddy current testing assembly includes an adjustment assembly that reciprocates along the XYZ axes, and a first reciprocating movement mechanism, a second reciprocating movement mechanism, and a third reciprocating movement mechanism that drive the adjustment assembly. A sleeve is fixed to the adjustment assembly, and a first hinge seat is rotatably mounted at the bottom of the sleeve. A second hinge seat is rotatably mounted on the first hinge seat along its axial direction, and a fixed sleeve is rotatably mounted on the second hinge seat along its axial direction. An eddy current testing head is detachably installed in the fixed sleeve. When testing complex curved surfaces of some plates, the eddy current testing head can automatically adjust its position precisely and flexibly.

[0007] Preferably, the adjusting assembly is further equipped with a second rotary drive for driving the first hinge seat to rotate, and the second rotary drive is mounted on the top of the sleeve, with the output end of the second rotary drive fixedly connected to the top of the first hinge seat.

[0008] Preferably, the eddy current detection head consists of an eddy current detection coil, a visual inspection camera, and a laser detector, and is used to detect internal defects and external surface defects of the sheet metal and to detect the curvature of the sheet metal.

[0009] Preferably, the bottom of the fixing sleeve is also fixed with a fixing ring, and the fixing ring has at least two grooves inside. The center of the fixing ring also has a through hole for one end of the eddy current detection head to pass through. Each groove has a buckle slidably disposed inside, and one end of the buckle is fixed with a first spring. One end of the first spring is fixed to the inner wall of the groove, and the first spring can be compressed when the buckle moves.

[0010] Preferably, one side of the bottom of the buckle is provided as an arc-shaped surface, and the groove is divided into a snap-fit ​​position and a clearance position. When the buckle moves, it reciprocates between the snap-fit ​​position and the clearance position.

[0011] Preferably, a limiting component is fixedly installed near the bottom of the eddy current detection head, and a sliding sleeve is slidably provided on the top of the limiting component of the eddy current detection head, and a limiting sleeve is fixed at one end of the eddy current detection head.

[0012] Preferably, the upper surface of the limiting sleeve is arc-shaped, the lower surface of the sliding sleeve is arc-shaped, and a space for the buckle to be inserted is reserved between the sliding sleeve and the limiting sleeve. When the top of the eddy current detection head is inserted into the fixing ring, when the arc-shaped surface of the top of the limiting sleeve contacts the arc-shaped surface of the bottom of the buckle, the buckle moves from the clamping position to the clearance position. After the limiting sleeve passes the buckle, the buckle moves from the clearance position to the clamping position.

[0013] Preferably, a second spring is also fixed inside the fixing sleeve. When the top of the eddy current detection head is inserted into the fixing sleeve, the eddy current detection head compresses the second spring. The second spring provides downward pressure to the eddy current detection head to prevent the eddy current detection head from shaking.

[0014] Compared with the prior art, the beneficial effects of this utility model are: the residual stress eddy current detection device for aluminum alloy plates has a reasonable structure and the following advantages:

[0015] (1) This application provides an adjustment component that moves up and down on the third reciprocating moving mechanism, and a fixed sleeve is installed on the adjustment component. The fixed sleeve can rotate on its own in the fixed sleeve, and the laser detector in the eddy current detection head detects the curvature of the aluminum alloy plate and feeds the detection result back to the control system. Thus, the first hinge seat and the second hinge seat will make the eddy current detection head adjust according to the curvature of the aluminum alloy plate, so that the eddy current detection head is relatively perpendicular to the curved surface, avoiding the angle between the probe and the aluminum alloy plate being too large, which would affect the accuracy of the detection.

[0016] (2) This application has a structure for quick installation and replacement of eddy current detection head. When the eddy current detection head is inserted into the fixed sleeve, when the arc-shaped surface at the top of the limiting sleeve contacts the arc-shaped surface at the bottom of the buckle, the buckle moves from the detection position to the clearance position. After the limiting sleeve passes the buckle, the buckle moves from the clearance position to the clamping position, thereby quickly installing the eddy current detection head. When it is necessary to remove the eddy current detection head, the eddy current detection head moves upward. When the sliding sleeve moves upward, the buckle moves and the sliding sleeve contacts the limiting sleeve, so that the eddy current detection head can be easily removed and replaced.

[0017] (3) This application also has an automatic positioning device. When the aluminum alloy plate is placed on the conveying assembly, the positioning assembly can place the aluminum alloy plate upright to avoid the aluminum alloy plate tilting and affecting the detection effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a three-dimensional structure of an eddy current detection device for residual stress in aluminum alloy sheets.

[0019] Figure 2 This is a top view schematic diagram of a residual stress eddy current detection device for aluminum alloy plates.

[0020] Figure 3 This is a three-dimensional structural diagram of the eddy current detection component of an eddy current detection device for residual stress in aluminum alloy sheets.

[0021] Figure 4 This is a three-dimensional exploded view of the eddy current detection component of an eddy current detection device for residual stress in aluminum alloy sheets.

[0022] Figure 5This is a three-dimensional structural diagram of the eddy current detection head of an eddy current detection component for a residual stress eddy current detection device for aluminum alloy plates.

[0023] Figure 6 This is a schematic diagram of the internal structure of the fixed ring of a three-dimensional eddy current detection component in an eddy current detection device for residual stress in aluminum alloy sheets.

[0024] The following components are labeled in the diagram: 1. Frame; 2. Conveying assembly; 21. Conveyor; 22. Conveyor belt; 23. First rotary drive; 3. Positioning assembly; 31. Support; 32. Linear actuator; 321. Positioning plate; 4. Eddy current detection assembly; 41. First reciprocating movement mechanism; 42. Second reciprocating movement mechanism; 43. Third reciprocating movement mechanism; 44. Adjustment assembly; 441. Sleeve; 442. First hinge seat; 443. Second hinge seat; 444. Second rotary drive; 45. Fixed sleeve; 451. Eddy current detection head; 4511. Limiting component; 4512. Sliding sleeve; 4513. Limiting sleeve; 46. Fixed ring; 461. Groove; 462. First spring; 463. Buckle; 47. Second spring. Detailed Implementation

[0025] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0026] Reference Figures 1-6As shown, this utility model provides: a residual stress eddy current testing device for aluminum alloy plates, including a frame 1 and a conveying assembly 2 mounted on the frame 1. The conveying assembly 2 includes conveyors 21, and a conveyor belt 22 is connected between the conveyors 21 via rotating rollers. A first rotary drive component 23 for driving the conveyor belt 22 to rotate is also installed on the outside of the conveyors 21. The surface of the conveyor belt 22 can be made of a wear-resistant and low-friction coefficient material to reduce damage to the surface of the aluminum alloy plate. Positioning components 3 are installed on both sides of the conveying assembly 2. The positioning components 3 include support members 31, and at least one linear actuator 32 is mounted on the support member 31. Furthermore, one end of the linear driver 32 is connected to a positioning plate 321. The linear driver 32 can be driven by a high-precision servo motor or stepper motor, and in conjunction with a precision guide rail and slider, it achieves precise movement of the positioning plate 321. An eddy current detection component 4 is fixed to the side of the frame 1 near the positioning component 3. The eddy current detection component 4 includes an adjustment component 44 that reciprocates along the XYZ axes, and a first reciprocating movement mechanism 41, a second reciprocating movement mechanism 42, and a third reciprocating movement mechanism 43 that drive the adjustment component 44. Through programming control, precise adjustment of any position of the eddy current detection head 451 in three-dimensional space can be achieved. In addition, each movement mechanism can be equipped with an encoder or a grating ruler to achieve position feedback and improve positioning accuracy. Furthermore, a sleeve 441 is fixed on the adjusting component 44, and a first hinge seat 442 is rotatably mounted on the bottom of the sleeve 441. A second hinge seat 443 is rotatably mounted on the first hinge seat 442 along its axis, and a fixing sleeve 45 is rotatably mounted on the second hinge seat 443 along its axis. Torque sensors can be added to the first hinge seat 442 and the second hinge seat 443 to monitor and adjust the posture of the eddy current detection head 451 in real time during curved surface detection, ensuring stable reception of the detection signal. The eddy current detection head 451 is detachably installed in the fixing sleeve 45. When detecting complex curved surfaces of some sheet materials, the eddy current detection head 451 can automatically adjust its position precisely and flexibly.

[0027] The adjustment assembly 44 is also equipped with a second rotary drive 444 for driving the first hinge seat 442 to rotate. The second rotary drive 444 is mounted on the top of the sleeve 441, and its output end is fixedly connected to the top of the first hinge seat 442. The eddy current detection head 451 consists of an eddy current detection coil, a visual inspection camera, and a laser detector. It is used to detect internal and external surface defects of the sheet metal and to detect the curvature of the sheet metal. The eddy current detection coil is the core component of eddy current detection technology. It utilizes the principle of electromagnetic induction to generate a magnetic field by passing an alternating current through the coil. When the magnetic field encounters the sheet metal, eddy currents are generated inside the sheet metal. The size and distribution of the eddy currents are closely related to the conductivity, permeability, and internal defects (such as cracks and pores) of the sheet metal. By detecting the changes in the secondary magnetic field generated by the eddy currents, the internal defects of the sheet metal can be indirectly inferred. In order to realize the detection of defects on the external surface of the sheet metal, the eddy current detection head 451 also integrates a high-definition visual inspection camera. This camera can capture images of the board surface in real time and automatically identify and analyze surface defects such as scratches, dents, and rust through image processing algorithms. This design allows the inspection device to simultaneously detect internal and external defects, improving the comprehensiveness and efficiency of the inspection. The laser detector emits a laser beam and receives its reflected light, enabling precise measurement of the spatial position information of different points on the board surface. Combined with advanced algorithm processing, the curvature distribution of the board can be calculated, providing important reference data for subsequent eddy current testing.

[0028] In use, the laser detector in the eddy current detection head 451 detects the curvature of the aluminum alloy sheet and feeds the detection result back to the control system. As a result, the first hinge seat 442 and the second hinge seat 443 will adjust the eddy current detection head 451 according to the curvature of the aluminum alloy sheet, so that the eddy current detection head 451 is relatively perpendicular to the curved surface, avoiding an excessively large angle between the probe and the aluminum alloy sheet, which would affect the accuracy of the detection.

[0029] The bottom of the fixed sleeve 45 is also fixed with a fixed ring 46, and the fixed ring 46 has at least two grooves 461 inside. The fixed ring 46 also has a through hole at the center for one end of the eddy current detection head 451 to pass through. Each groove 461 has a latch 463 slidably disposed inside, and one end of the latch 463 is fixed with a first spring 462. When the latch 463 is moved by an external force, the first spring 462 will be compressed and store energy. Once the external force is removed, the spring force will push the latch 463 back to its original position. One end of the first spring 462 is fixed to the inner wall of the groove 461. When the latch 463 moves, it can compress the first spring 462. One side of the bottom of the latch 463 is set as an arc-shaped surface. The groove 461 is divided into a snap-fit ​​position and a clearance position. When the latch 463 moves, it moves back and forth between the snap-fit ​​position and the clearance position. The latch 463 can move smoothly when it is squeezed by the corresponding part of the eddy current detection head 451. The groove 461 is divided into a snap-fit ​​position and a clearance position. When the snap-fit ​​463 is subjected to external force, it will reciprocate between these two positions. When the eddy current detection head 451 is inserted into the through hole, its corresponding part will push the snap-fit ​​463 into the clearance position, compressing the first spring 462; when the eddy current detection head 451 reaches the predetermined position, the snap-fit ​​463 will quickly return to the snap-fit ​​position under the action of the spring force, thereby firmly locking the eddy current detection head 451.

[0030] Near the bottom of the eddy current detection head 451, a limiting member 4511 is fixedly installed, and a sliding sleeve 4512 is slidably disposed on the top of the limiting member 4511. A limiting sleeve 4513 is also fixed at one end of the eddy current detection head 451. The upper surface of the limiting sleeve 4513 is arc-shaped, and the lower surface of the sliding sleeve 4512 is arc-shaped. A space is reserved between the sliding sleeve 4512 and the limiting sleeve 4513 for the insertion of the buckle 463. When the top of the eddy current detection head 451 is inserted into the fixing ring 46, when the arc-shaped surface of the top of the limiting sleeve 4513 contacts the arc-shaped surface of the bottom of the buckle 463, the buckle 463 moves from the clamping position to the clearance position. After the limiting sleeve 4513 passes the buckle 463, the buckle 463 moves from the clearance position to the clamping position.

[0031] Before installation, the latch 463 is in the clamping position (i.e., the normal locking position), and the first spring 462 is uncompressed. The top of the eddy current detection head 451 is ready to be inserted into the through hole of the retaining ring 46. As the top of the eddy current detection head 451 is gradually inserted into the retaining ring 46, the arcuate upper surface of the limiting sleeve 4513 begins to contact the arcuate bottom of the latch 463. Due to the interaction between the two, the latch 463 is subjected to upward pressure and begins to move from the clamping position to the clearance position, while compressing the first spring 462. When the limiting sleeve 4513 has completely passed the position of the latch 463, the latch 463 is in the clearance position, and the first spring 462 is compressed. The eddy current detection head 451 continues to move upward until it reaches the predetermined installation depth. Once the eddy current detection head 451 reaches the predetermined position, the limiting sleeve 4513 no longer applies upward pressure to the latch 463. At this time, the first spring 462 begins to release its stored energy, pushing the latch 463 quickly back from the clearance position to the clamping position. In the clamping position, the buckle 463 securely clamps the limiting sleeve 4513, thereby ensuring that the eddy current detection head 451 is firmly installed on the retaining ring 46.

[0032] A second spring 47 is also fixed inside the fixing sleeve 45. When the top of the eddy current detection head 451 is inserted into the fixing sleeve 45, the eddy current detection head 451 compresses the second spring 47. The second spring 47 provides downward pressure to the eddy current detection head 451 to prevent it from shaking. The main function of the second spring 47 is to generate a downward elastic force when the top of the eddy current detection head 451 is inserted into the fixing sleeve 45, through compression by the eddy current detection head 451. This elastic force provides a stable support for the eddy current detection head 451, helping to reduce its shaking during operation and improving the accuracy and stability of the detection.

[0033] In use, when the eddy current detection head 451 is inserted into the fixing sleeve 45, the arc-shaped surface at the top of the limiting sleeve 4513 contacts the arc-shaped surface at the bottom of the buckle 463, causing the buckle 463 to move from the detection position to the clearance position. After the limiting sleeve 4513 passes the buckle 463, the buckle 463 moves from the clearance position to the clamping position, thereby quickly installing the eddy current detection head 451. When it is necessary to remove the eddy current detection head 451, the eddy current detection head 451 moves upward, and when the sliding sleeve 4512 moves upward, the buckle 463 moves, and the sliding sleeve 4512 contacts the limiting sleeve 4513, so that the eddy current detection head 451 can be easily removed and replaced.

[0034] The above embodiments only illustrate one or more implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A residual stress eddy current testing device for aluminum alloy plates, comprising a frame (1), a conveying assembly (2) mounted on the frame (1), and positioning assemblies (3) mounted on both sides of the conveying assembly (2), characterized in that: An eddy current detection component (4) is fixed on the side of the frame (1) near the positioning component (3). The eddy current detection component (4) includes an adjustment component (44) that reciprocates along the XYZ axis and a first reciprocating moving mechanism (41), a second reciprocating moving mechanism (42), and a third reciprocating moving mechanism (43) that drive the adjustment component (44) to move. A sleeve (441) is fixed on the adjustment component (44), and a first hinge is rotatably provided at the bottom of the sleeve (441). A first hinge seat (442) is provided with a second hinge seat (443) which is rotatably provided on the first hinge seat (442) along the axis of the first hinge seat (442). A fixed sleeve (45) is rotatably provided on the second hinge seat (443) along the axis of the second hinge seat (443). An eddy current detection head (451) is detachably installed in the fixed sleeve (45). When inspecting the complex curved surfaces of some plates, the eddy current detection head (451) can automatically adjust its position with precision and flexibility.

2. The eddy current testing device for residual stress in aluminum alloy plates according to claim 1, characterized in that: The adjustment assembly (44) is also equipped with a second rotary drive (444) for driving the first hinge seat (442) to rotate, and the second rotary drive (444) is installed on the top of the sleeve (441), and the output end of the second rotary drive (444) is fixedly connected to the top of the first hinge seat (442).

3. The eddy current testing device for residual stress in aluminum alloy plates according to claim 1, characterized in that: The eddy current detection head (451) consists of an eddy current detection coil, a visual inspection camera, and a laser detector, and is used to detect internal defects and external surface defects of the sheet metal and to detect the curvature of the sheet metal.

4. The residual stress eddy current detection device for aluminum alloy plates according to claim 1, characterized in that: The bottom of the fixed sleeve (45) is also fixed with a fixed ring (46), and the fixed ring (46) has at least two grooves (461) inside. The fixed ring (46) also has a through hole at the center for one end of the eddy current detection head (451) to pass through. Each groove (461) has a buckle (463) slidably arranged inside, and one end of the buckle (463) is fixed with a first spring (462). One end of the first spring (462) is fixed to the inner wall of the groove (461). When the buckle (463) moves, it can compress the first spring (462).

5. The eddy current testing device for residual stress in aluminum alloy plates according to claim 4, characterized in that: The bottom side of the buckle (463) is set as an arc-shaped surface, and the groove (461) is divided into a snap-fit ​​position and a clearance position. When the buckle (463) moves, it moves back and forth between the snap-fit ​​position and the clearance position.

6. The eddy current testing device for residual stress in aluminum alloy plates according to claim 4, characterized in that: The eddy current detection head (451) is also fixedly installed near the bottom with a limiting component (4511), and a sliding sleeve (4512) is slidably provided on the top of the limiting component (4511) of the eddy current detection head (451), and a limiting sleeve (4513) is fixed at one end of the eddy current detection head (451).

7. The eddy current testing device for residual stress in aluminum alloy plates according to claim 6, characterized in that: The upper surface of the limiting sleeve (4513) is arc-shaped, and the lower surface of the sliding sleeve (4512) is arc-shaped. A space is reserved between the sliding sleeve (4512) and the limiting sleeve (4513) for the insertion of the buckle (463). When the top of the eddy current detection head (451) is inserted into the fixing ring (46), when the arc-shaped surface of the top of the limiting sleeve (4513) contacts the arc-shaped surface of the bottom of the buckle (463), the buckle (463) moves from the clamping position to the clearance position. After the limiting sleeve (4513) passes the buckle (463), the buckle (463) moves from the clearance position to the clamping position.

8. The eddy current testing device for residual stress in aluminum alloy plates according to claim 1, characterized in that: The fixing sleeve (45) also has a second spring (47) fixed inside. When the top of the eddy current detection head (451) is inserted into the fixing sleeve (45), the eddy current detection head (451) compresses the second spring (47). The second spring (47) provides downward pressure to the eddy current detection head (451) to prevent the eddy current detection head (451) from shaking.

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