Curved surface multi-depth X-ray stress detection equipment

Abstract

The invention discloses curved surface multi-depth X-ray stress detection equipment, and relates to the technical field of stress detection.The equipment comprises an upper supporting arm, a first servo motor is installed in the upper supporting arm, the output end of the first servo motor extends to the lower end of the upper supporting arm to be fixedly connected with a lower supporting arm, and the lower supporting arm is fixedly connected with a detection body through four spring supporting rods; the detection body is located below the lower supporting arm, an X-ray tube is fixed to the front side of the lower end of the detection body, and a left linear array detector and a right linear array detector are fixed to the left side and the right side of the X-ray tube respectively. The core detection function can be achieved through the X-ray tube and the two linear array detectors, compared with traditional equipment, a complex mechanical scanning mechanism and a psi angle adjusting mechanism are omitted, and the equipment structure is remarkably simplified. During operation, data can be directly collected and stress values can be calculated through the left linear array detector and the right linear array detector only by adjusting the plane of the machine shell and the plane of the measured piece to be parallel, and the operation process is simple, convenient and rapid.

Description

Technical Field

[0001] The present invention relates to the technical field of stress detection, and particularly to a curved surface multi-depth X-ray stress detection device. Background Art

[0002] At present, X-ray stress detection technology is widely used in the fields of materials science, mechanical manufacturing, aerospace, etc. to evaluate the stress state inside materials. However, traditional X-ray stress testing equipment has some significant limitations, especially when detecting complex curved surfaces and multi-depth stress distributions.

[0003] Traditional X-ray stress testing equipment usually requires two types of motion mechanisms: one is the mechanism for measuring the diffraction angle 2θ through mechanical scanning, which is used to accurately measure the X-ray diffraction angle and thus calculate the stress state inside the material; the other is the mechanism for changing the Ψ angle. The Ψ angle is the angle between the X-ray incident direction and the normal of the test surface. Changing the Ψ angle can adjust the penetration depth and detection range of the X-ray.

[0004] However, traditional equipment faces many challenges when detecting complex curved surfaces or multi-depth stress distributions. Traditional methods need to adjust the Ψ angle through mechanical scanning and collect data point by point. This process is time-consuming, especially when detecting complex curved surfaces or performing multi-depth stress analysis, the testing time is significantly extended and the efficiency is low. In addition, when detecting curved surfaces with traditional equipment, due to the complexity of the curved surface shape, it is often difficult to ensure that the X-ray is always perpendicular to the local normal of the curved surface, resulting in detection errors.

[0005] Based on this, a curved surface multi-depth X-ray stress detection device is now provided, which can eliminate the drawbacks of existing equipment. Summary of the Invention

[0006] The purpose of the present invention is to provide a curved surface multi-depth X-ray stress detection device to solve the problems in the background art.

[0007] To achieve the above purpose, the present invention provides the following technical solutions:

[0008] A curved surface multi-depth X-ray stress detection device includes an upper support arm. A servo motor I is installed inside the upper support arm. The output end of the servo motor I extends to the lower end of the upper support arm and is fixedly connected to a lower support arm. The lower support arm is fixedly connected to a detection body through four spring support rods. The detection body is located below the lower support arm. An X-ray tube is fixedly provided on the front side of the lower end of the detection body. A left linear detector and a right linear detector are respectively fixed on the left and right sides of the X-ray tube.

[0009] Preferably, a system housing is fixed to the rear end of the lower support arm, and a servo motor 2 is installed inside the system housing. The output end of the servo motor 2 extends to the front end of the lower support arm and is fixedly connected to the swing plate. The rear end of the detection body is connected to the swing plate through an upper swing wheel and a lower swing wheel.

[0010] Preferably, the X-rays emitted by the X-ray tube form a fixed angle 2η with the center lines of the left linear array detector and the right linear array detector, where η is the half angle between the X-ray incident direction and the detector receiving direction, and the vertex is the test point S, where the two laser beams intersect.

[0011] Preferably, a goniometer is fixed to the front end of the lower support arm via a goniometer support rod, a goniometer ray emitting tube is installed at the lower end of the goniometer, and the plane of the system housing forms an angle of 45° with the incident ray of the X-ray tube.

[0012] Preferably, a bracket arm is fixed at the four corners of the upper support arm, each of the bracket arms is fixed to a main support rod, the four main support rods are connected to the fine-tuning lifting mechanism, a bracket top cover is fixed to the upper end of the main support rod, and a bracket base is fixed to the lower end of the main support rod.

[0013] Preferably, an X-ray shield is installed on the upper end of the fine-tuning lifting mechanism.

[0014] Preferably, the X-ray shield is made of high-density materials such as lead or tungsten alloy and has a thickness of 3-5 mm.

[0015] Preferably, the surfaces of the left linear array detector and the right linear array detector are covered with cadmium zinc telluride crystals, and lead plates are installed on the left side of the left linear array detector and on the right side of the right linear array detector.

[0016] Preferably, the swing plate is covered with a black alumina ceramic coating.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. The present invention can realize the core detection function through the X-ray tube and two linear array detectors. Compared with traditional equipment, the present invention eliminates the complex mechanical scanning mechanism and Ψ angle adjustment mechanism, significantly simplifying the equipment structure. During operation, it is only necessary to adjust the plane of the housing and the plane of the tested object to be parallel, and the left and right linear array detectors can be used to directly collect data and calculate the stress value. The operation process is simple and fast.

[0019] 2. The present invention drives the X-ray tube and the detector to synchronously adjust the incident direction through a swinging disk, and combines the fine-tuning lifting mechanism to compensate for the height difference, so as to achieve accurate adaptive detection of complex curved surfaces. This design ensures that the X-rays are always perpendicular to the local normal of the curved surface, thereby improving the detection accuracy and solving the problem that traditional equipment is difficult to ensure detection accuracy when detecting curved surfaces. Brief Description of the Drawings

[0020] Figure 1 This is a schematic structural diagram of the present invention.

[0021] Figure 2 This is a schematic structural diagram of the right side position of the present invention.

[0022] Figure 3 This is a schematic structural diagram of the detector body of the present invention.

[0023] Figure 4 This is a schematic structural diagram of the component to be measured of the present invention.

[0024] Annotation of reference numerals in the drawings: 1. Bracket top cover; 2. Bracket large arm; 3. Bracket small arm; 4. Main support rod; 5. Goniometer support rod; 6. Goniometer; 7. Goniometer ray emission tube; 8. Detector body; 9. X-ray tube; 10. Bracket base; 11. Upper support arm; 12. Lower support arm; 13. System housing; 14. Upper swing pulley; 15. Lower swing pulley; 16. Swing disk; 17. Left linear array detector; 18. Right linear array detector; 19. X-ray protective cover; 20. Fine-tuning lifting mechanism; 21. Spring support rod. Detailed Description of the Invention

[0025] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] In one embodiment, as Figures 1 - 3 shown, a curved surface multi-depth X-ray stress detection device includes an upper support arm 11, a servo motor I is installed inside the upper support arm 11, the output end of the servo motor I extends to the lower end of the upper support arm 11 and is fixedly connected to a lower support arm 12, the lower support arm 12 is fixedly connected to a detector body 8 through four spring support rods 21, the detector body 8 is located below the lower support arm 12, an X-ray tube 9 is fixedly installed on the front side of the lower end of the detector body 8, and a left linear array detector 17 and a right linear array detector 18 are respectively fixedly installed on the left and right sides of the X-ray tube 9.

[0027] In this embodiment, the X-ray tube 9 serves as an emission source to generate a monochromatic X-ray beam. By driving the rotational movement of the lower support arm 12 through the servo motor I, the X-ray incident angle ψ (conforming to the sin2ψ method principle) can be changed, so as to realize the penetration depth adjustment from the material surface layer to the subsurface layer (usually the detection depth reaches 50 - 100 μm). The left linear array detector 17 and the right linear array detector 18 arranged symmetrically on the left and right form a dual-channel receiving system, which can synchronously collect diffraction signals in different directions.

[0028] In an alternative embodiment, a system housing 13 is fixed to the rear end of the lower support arm 12. A second servo motor is installed inside the system housing 13. The output end of the second servo motor extends to the front end of the lower support arm 12 and is fixedly connected to a swing disc 16. The rear end of the detection body 8 is connected to the swing disc 16 through an upper swing pulley 14 and a lower swing pulley 15.

[0029] It should be noted that when the second servo motor drives the swing disc 16 to rotate, a four-bar linkage mechanism composed of the upper swing pulley 14 and the lower swing pulley 15 causes the detection body 8 to generate a swing compensation of ±15°.

[0030] In an alternative embodiment, the X-rays emitted by the X-ray tube 9 form a fixed angle 2η with the center lines of the left linear array detector 17 and the right linear array detector 18. η is the half angle between the X-ray incident direction and the detector receiving direction. Its vertex is the test point S, and the two laser beams intersect at point S.

[0031] It should be noted that the X-ray beam emitted by the X-ray tube 9 forms a fixed angle 2η (η is the half angle) with the center lines of the left linear array detector 17 and the right linear array detector 18. Its vertex S is the test point. The two auxiliary laser beams intersect in space at point S.

[0032] In an alternative embodiment, a goniometer 6 is fixed to the front end of the lower support arm 12 through a goniometer support rod 5. A goniometer ray emitting tube 7 is installed at the lower end of the goniometer 6. The plane of the system housing 13 forms a 45° angle with the incident ray of the X-ray tube 9.

[0033] It should be noted that the goniometer 6 is the core of the angle control of the device. It realizes precise diffraction angle measurement through a θ-2θ linkage mechanism. Based on the formula nλ = 2dsinθ, the goniometer 6 synchronously rotates the sample stage (θ) and the detector (2θ) to maintain a ratio of 2:1 between the incident angle and the diffraction angle, thereby accurately measuring the crystal plane spacing d.

[0034] In an alternative embodiment, brackets for large arms 2 are fixed at the four corners of the upper support arm 11. Each bracket for large arm 2 is fixed to a main support rod 4. The four main support rods 4 are all connected to a fine adjustment lifting mechanism 20. The upper end of the main support rod 4 is fixed with a bracket top cover 1, and the lower end of the main support rod 4 is fixed with a bracket base 10.

[0035] It should be noted that the first servo motor drives the lower support arm 12 to rotate (±90°) to adjust the ψ angle. The second servo motor drives the swing disc 16 to swing (±15°) to compensate for the deviation of the surface normal.

[0036] In an alternative embodiment, an X-ray protective cover 19 is installed at the upper end of the fine adjustment lifting mechanism 20.

[0037] It should be noted that the fine-tuning lifting mechanism 20 is synchronously driven by the four main support rods 4 to achieve ±50 mm adjustment in the vertical up and down direction.

[0038] In an optional embodiment, the X-ray shield 19 is made of high-density materials such as lead or tungsten alloy, and has a thickness of 3-5 mm.

[0039] It should be noted that the 3-5 mm thick lead-tungsten alloy protective cover 19 controls the radiation dose rate at the operating position to <0.5 μSv / h.

[0040] In an optional embodiment, the surfaces of the left linear array detector 17 and the right linear array detector 18 are covered with cadmium zinc telluride crystals, and lead plates are installed on the left side of the left linear array detector 17 and the right side of the right linear array detector 18.

[0041] It should be noted that the surfaces of the left linear array detector 17 and the right linear array detector 18 are covered with cadmium zinc telluride crystals, which only allow X-rays of specific energy (such as Cr-Ka rays, 5.4 keV) to pass through; lead plates are installed on both sides of the detectors to block scattered rays from non-test directions.

[0042] In an optional embodiment, the swing plate 16 is covered with a black alumina ceramic coating.

[0043] It should be noted that the swing plate 16 covered with black alumina ceramic coating effectively absorbs stray radiation, and cooperates with the surface normal tracking algorithm to enable the device to automatically adapt to complex geometric surfaces with a curvature radius ≥ 50 mm.

[0044] The above embodiment discloses a curved surface multi-depth X-ray stress detection device, wherein the X-ray tube 9 is used as a monochromatic radiation source, and the emitted X-ray beam forms a fixed angle 2η (half angle η) with the center line of the left linear array detector 17 and the right linear array detector 18, and the two laser beams intersect at the test point S to form a spatial positioning reference. The optical path design of the system housing 13 at an angle of 45° with the X-ray incident direction ensures that the radiation beam is projected onto the measured curved surface at a preset angle.

[0045] The lower support arm 12 is driven to rotate by the servo motor 1, driving the detector 8 to continuously adjust the ψ angle (in accordance with the principle of the sin2ψ method). This movement changes the X-ray incident angle within the range of 0° to 45°, and cooperates with the real-time angle calibration of the goniometer 6 (the goniometer ray emission tube 7 provides a reference) to achieve penetration depth control from the surface layer to the sub-surface layer (50-100μm) of the material. The spring support rod 21 provides a flexible buffer to ensure pressure stability when the curved surface is in contact.

[0046] When the servo motor 2 drives the swing plate 16 to rotate, the detection body 8 generates a swing compensation of ±15° through the four-bar linkage composed of the upper swing wheel 14 and the lower swing wheel 15. The swing plate 16 covered with black alumina ceramic coating effectively absorbs stray radiation, and with the surface normal tracking algorithm, the device can automatically adapt to complex geometric surfaces with a curvature radius of ≥50mm.

[0047] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A curved surface multi-depth X-ray stress detection device, characterized in that, It includes an upper support arm (11) with a servo motor I installed therein. The output end of the servo motor I extends to the lower end of the upper support arm (11) and is fixedly connected to a lower support arm (12). The lower support arm (12) is fixedly connected to a detection body (8) through four spring support rods (21). The detection body (8) is located below the lower support arm (12). An X-ray tube (9) is fixedly provided at the front side of the lower end of the detection body (8). A left linear array detector (17) and a right linear array detector (18) are respectively fixedly provided on the left and right sides of the X-ray tube (9).

2. The surface multi-depth X-ray stress detection device according to claim 1, characterized in that, A system housing (13) is fixedly provided at the rear end of the lower support arm (12). A servo motor II is installed inside the system housing (13). The output end of the servo motor II extends to the front end of the lower support arm (12) and is fixedly connected to a swing disc (16). The rear end of the detection body (8) is connected to the swing disc (16) through an upper swing small wheel (14) and a lower swing small wheel (15).

3. The surface multi-depth X-ray stress detection device according to claim 1, characterized in that, The X-rays emitted by the X-ray tube (9) form an angle of 2η with the center lines of the left linear array detector (17) and the right linear array detector (18). η is the half angle between the X-ray incident direction and the detector receiving direction, and its vertex is the test point S. Two laser beams intersect at point S.

4. A curved surface multi-depth X-ray stress detection device according to claim 2, characterized in that, A goniometer (6) is fixedly provided at the front end of the lower support arm (12) through a goniometer support rod (5). A goniometer ray emitting tube (7) is installed at the lower end of the goniometer (6). The plane of the system housing (13) forms a 45° angle with the incident ray of the X-ray tube (9).

5. A curved multi-depth X-ray stress detection device according to claim 1, characterized in that, Support arms (2) are fixedly provided at the four corners of the upper support arm (11). Each support arm (2) is fixedly connected to a main support rod (4). The four main support rods (4) are all connected to a fine adjustment lifting mechanism (20). The upper end of the main support rod (4) is fixedly provided with a support top cover (1), and the lower end of the main support rod (4) is fixedly provided with a support base (10).

6. The surface multi-depth X-ray stress detection device according to claim 5, characterized in that, An X-ray protective cover (19) is installed at the upper end of the fine adjustment lifting mechanism (20).

7. A curved multi-depth X-ray stress detection device according to claim 6, characterized in that, The X-ray protective cover (19) is made of a high-density material such as lead or tungsten alloy, and its thickness is 3 - 5 mm.

8. A curved multi-depth X-ray stress detection device according to claim 1, characterized in that The surfaces of the left linear array detector (17) and the right linear array detector (18) are covered with cadmium zinc telluride crystals. Lead plates are installed on the left side of the left linear array detector (17) and the right side of the right linear array detector (18).

9. The surface multi-depth X-ray stress detection device according to claim 2, characterized in that, The swing disc (16) is covered with a black alumina ceramic coating.

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