An austenitic stainless steel tube oxide magnetic non-destructive testing device

Abstract

The application relates to the field of stainless steel pipe oxide detection, and discloses an austenitic stainless steel pipe oxide magnetic nondestructive detection device, which comprises a detection frame body, a center detection cavity is arranged in the detection frame body, a transmission assembly is arranged on the detection frame body, the transmission assembly is used for driving a detection head to move along the circumference and the radius of the center detection cavity, so that multi-dimensional magnetic detection is carried out on the austenitic stainless steel pipe in the center detection cavity, the transmission assembly comprises a driving motor and a driven gear, and a driving gear is fixedly connected to the output end of the driving motor through a rotating shaft. The austenitic stainless steel pipe can be synchronously moved close to the outer wall of the austenitic stainless steel pipe by the multiple detection heads, so that the surface and the near-surface oxide of the pipe are subjected to omnibearing and multi-point magnetic detection, different specifications of austenitic stainless steel pipes can be detected, and the austenitic stainless steel pipe can be conveniently and quickly inserted into the center detection cavity from the open slot.

Description

Technical Field

[0001] This invention relates to the field of stainless steel pipe oxide detection technology, specifically to a magnetic non-destructive testing device for austenitic stainless steel pipe oxides. Background Technology

[0002] Austenitic stainless steel pipes are widely used in key industrial fields such as petrochemicals, nuclear power, and aerospace due to their excellent corrosion resistance, high-temperature stability, and mechanical properties. During long-term use, oxide layers easily form on the surface and inside of the pipes due to oxidation. The thickness and distribution of these oxide layers directly affect the structural integrity and operational safety of the pipes. Therefore, the detection of oxides in austenitic stainless steel pipes is a crucial step in industrial production and equipment maintenance. Magnetic non-destructive testing can detect the internal oxide layer without damaging the austenitic stainless steel pipe.

[0003] The working principle of the magnetic non-destructive testing device is based on electromagnetic induction effect and hysteresis loop analysis technology. During testing, the operator holds the testing head and makes it fit tightly against the outer wall of the austenitic stainless steel pipe. A stable magnetic field is generated by the excitation coil inside the testing head. The magnetic field penetrates the surface of the pipe and the oxide layer to form an induced magnetic field. The intensity and distribution of the induced magnetic field will change with the thickness and permeability of the oxide. The magnetic sensor built into the testing head captures the magnetic field signal and converts it into an electrical signal. The electrical signal is sent to the controller through the transmission line. After processing and analyzing the signal, the controller displays the oxide-related test data, such as thickness and uniformity, on the display screen in real time, allowing the operator to judge the oxide state of the pipe.

[0004] Currently, during the non-destructive testing of oxide magnetic properties in austenitic stainless steel pipes, due to the uneven distribution of oxides inside the pipe, operators need to manually adjust the testing head to move repeatedly along the pipe's axial and circumferential directions to ensure the comprehensiveness and accuracy of the test data. During the measurement process, operators also need to continuously observe the controller display screen to adjust the movement trajectory. However, this repetitive manual operation at multiple angles prolongs the testing cycle of a single pipe, reduces the overall testing efficiency, and increases the labor intensity of the operators.

[0005] Therefore, the purpose of this invention is to provide a non-destructive testing device for the oxide magnetic properties of austenitic stainless steel tubes, in order to overcome the shortcomings of the prior art. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a magnetic non-destructive testing device for austenitic stainless steel pipe oxides, which solves the problem that operators need to manually adjust the testing head and repeatedly move it along the pipe axis, circumference, and other angles during magnetic non-destructive testing of austenitic stainless steel pipe oxides.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a non-destructive testing device for the oxide magnetic properties of austenitic stainless steel tubes, comprising a testing frame, a central testing cavity inside the testing frame, and a transmission assembly on the testing frame. The transmission assembly drives a testing head to move circumferentially and radially along the central testing cavity to perform multi-dimensional magnetic testing on the austenitic stainless steel tube within the central testing cavity. The transmission assembly includes a drive motor and a driven gear. The output end of the drive motor is fixedly connected to a drive gear via a rotating shaft. The side surface of the drive gear meshes with a drive rack. The side surface of the driven gear meshes with a half-tooth ring. The side surface of the driven gear meshes with a driven rack. The end of both the drive rack and the driven rack near the central testing cavity is fixedly connected to a testing head via a first connecting block. The testing frame has an opening slot inside and an annular groove inside. An annular guide block is disposed inside the annular groove.

[0008] Preferably, the sidewall of the semi-toothed ring is fixedly connected to the annular guide block, the annular guide block cooperates with the annular groove to guide and limit the circumferential movement of the semi-toothed ring, the lower surface of the detection frame is fixedly connected to the drive motor, and the rotating shaft passes through the interior of the detection frame.

[0009] Preferably, the inside of the detection frame is provided with a first guide groove, and a first guide block is fixedly connected to the end of the active rack away from the active gear, and the inner surface of the first guide groove is slidably connected to the first guide block.

[0010] Preferably, the inside of the detection frame is provided with a second guide groove, and the inner surface of the second guide groove is slidably connected to the first guide block.

[0011] Preferably, the inside of the detection frame is provided with a third guide groove, and a second guide block is fixedly connected to the end of the driven rack away from the driven gear, and the inner surface of the third guide groove is slidably connected to the second guide block.

[0012] Preferably, the inside of the detection frame is provided with a fourth guide groove, and the inner surface of the fourth guide groove is slidably connected to the second guide block.

[0013] Preferably, the inside of the detection frame is provided with a groove, the bottom inner wall of the groove is fixedly connected to a fixing frame, the side surface of the rotating shaft is fixedly connected to a bearing, and the upper surface of the bearing is fixedly connected to the fixing frame.

[0014] Preferably, a lithium battery is fixedly connected to the lower surface of the testing frame, a transmission line is fixedly connected to the lower surface of the testing frame, a controller is fixedly connected to the end of the transmission line away from the testing frame, a display screen is provided on the upper surface of the controller, and a handle is fixedly connected to the side surface of the testing frame.

[0015] Preferably, a second connecting block is fixedly connected to the side surface of the detection head, the second connecting block has a spherical groove inside, a ball is arranged inside the spherical groove, a placement groove is arranged inside the second connecting block, a miniature piezoresistive pressure sensor is fixedly connected to the inner surface of the placement groove, an oil tank is fixedly connected to the upper surface of the second connecting block, an oil outlet pipe is fixedly connected to the lower surface of the oil tank, and a miniature solenoid valve is arranged inside the oil outlet pipe.

[0016] Preferably, a feed pipe is fixedly connected to the upper surface of the oil storage tank, a pipe cap is provided on the side surface of the feed pipe, an electric field induction probe is provided on the detection head, an electrode chamber is provided inside the detection head, and an electrode integrated module is provided inside the electrode chamber.

[0017] This invention provides a non-destructive testing device for the magnetic properties of austenitic stainless steel tube oxides. It has the following advantages:

[0018] 1. This invention, through the design of a detection frame, transmission assembly, first connecting block, detection head, detection cavity, and opening slot, uses a drive motor to rotate a shaft. The driving gear on the shaft meshes with a driving rack and a semi-gear ring, causing the semi-gear ring to rotate in a circle. The semi-gear ring meshes with multiple driven gears, which in turn drive the driven rack to move radially, enabling multiple detection heads to move synchronously and approach the outer wall of the austenitic stainless steel pipe. This allows for comprehensive, multi-point magnetic detection of oxides on the pipe surface. During use, operators do not need to manually adjust the detection heads to repeatedly move and measure along the pipe's axial and circumferential directions, increasing the detection cycle for a single pipe and thus improving overall detection efficiency while reducing operator workload.

[0019] 2. This invention allows for flexible adjustment of the radial position of the detection head. When dealing with austenitic stainless steel pipes of different diameters, the drive motor can adjust the rotation angle of the shaft, thereby adjusting the extension and retraction stroke of the driven rack, allowing the detection head to fit against the outer wall of the pipe. This structure can inspect austenitic stainless steel pipes of different specifications, reducing the economic cost for users to purchase multiple sets of equipment due to changes in pipe size, while improving the resource utilization rate of the equipment.

[0020] 3. The open slot and the central detection cavity of this invention work together to allow the austenitic stainless steel tube to quickly pass through the open slot into the central detection cavity. After the tube enters, the transmission component on the detection frame can adjust the detection head to move towards and fit against the outer wall of the tube, thereby realizing the detection of oxides on the tube. This structure can complete the detection without disassembling the tube during use, making it simple and convenient to use. Attached Figure Description

[0021] Figure 1This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a top view of the present invention;

[0023] Figure 3 This is a first-view structural diagram of the detection frame of the present invention;

[0024] Figure 4 This is a schematic diagram of the detection frame structure from a second perspective of the present invention;

[0025] Figure 5 This is a schematic diagram of the fixing frame structure of the present invention;

[0026] Figure 6 This is a schematic diagram of the detection head structure of the present invention;

[0027] Figure 7 This is a schematic diagram of the internal structure of the second connecting block of the present invention;

[0028] Figure 8 This is a schematic diagram of the internal structure of the detection head of the present invention.

[0029] The components include: 1. Detection frame; 2. Transmission assembly; 201. Drive motor; 202. Rotating shaft; 203. Drive gear; 204. Drive rack; 205. Half-gear ring; 206. Driven gear; 207. Driven rack; 3. First connecting block; 4. Detection head; 5. First guide groove; 6. First guide block; 7. Second guide groove; 8. Third guide groove; 9. Fourth guide groove; 10. Annular groove; 11. Annular guide block; 12. Groove; 13. Fixing frame; 14. Bearing. 15. Lithium battery; 16. Handle; 17. Transmission line; 18. Controller; 19. Display screen; 20. Central detection chamber; 21. Opening slot; 22. Second guide block; 23. Second connecting block; 24. Spherical groove; 25. Ball bearing; 26. Placement slot; 27. Miniature piezoresistive pressure sensor; 28. Oil reservoir; 29. ​​Oil outlet pipe; 30. Miniature solenoid valve; 31. Feed pipe; 32. Pipe cap; 33. Electric field induction probe; 34. Electrode chamber; 35. Electrode integrated module. Detailed Implementation

[0030] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0031] See appendix Figure 1 - Appendix Figure 8This invention provides a non-destructive testing device for the oxide magnetic properties of austenitic stainless steel tubes, including a testing frame 1, a central testing cavity 20 inside the testing frame 1, and a transmission assembly 2 on the testing frame 1. The transmission assembly 2 is used to drive the testing head 4 to move circumferentially and radially along the central testing cavity 20 to perform multi-dimensional magnetic testing on the austenitic stainless steel tubes inside the central testing cavity 20.

[0032] The testing frame 1 is made of high-strength aluminum alloy through die casting, which improves the overall load-bearing strength of the testing device, can withstand external impacts without deformation, and is easy to handle and operate on site. The testing frame 1 also provides a stable and reliable installation benchmark for each functional module. Currently, in the non-destructive testing of austenitic stainless steel pipe oxides, due to the uneven distribution of oxides inside the austenitic stainless steel pipe, to ensure the comprehensiveness and accuracy of the test data, operators need to manually adjust the testing head 4 to repeatedly move and measure along the pipe's axial and circumferential directions. During the measurement process, the operator must continuously observe the display screen 19 on the controller 18 to adjust the movement trajectory. However, this repetitive, multi-angle manual operation prolongs the testing cycle of a single pipe, reduces overall testing efficiency, and increases the labor intensity of the operators. Through the structure of the testing frame 1, transmission component 2, first connecting block 3, and testing head 4, comprehensive, multi-point magnetic testing of the oxides on and near the surface of the pipe can be performed. During use, operators do not need to manually adjust the detection head 4 to move and measure repeatedly along the pipe axis, circumference and other angles, which increases the detection cycle of a single pipe and thus improves the overall detection efficiency, while also reducing the labor intensity of operators.

[0033] The transmission assembly 2 includes a drive motor 201 and a driven gear 206. The output end of the drive motor 201 is fixedly connected to a drive gear 203 via a rotating shaft 202. The side surface of the drive gear 203 meshes with a drive rack 204. The side surface of the driven gear 206 meshes with a half-tooth ring 205 and a driven rack 207.

[0034] The drive motor 201 is a high-precision servo motor, which has the characteristics of precise speed adjustment and stable torque. It controls the output power through pulse signals to drive the rotating shaft 202 to rotate at a fixed angle, ensuring the controllability of power output. The speed adjustment of the drive motor 201 is a current technology. The rotating shaft 202 and the drive gear 203 are connected by a key to ensure lossless power transmission. The drive gear 203 meshes with the drive rack 204 to convert the rotational motion into linear motion. At the same time, the drive gear 203 drives the half-tooth ring 205 to move in a circular motion along a circular trajectory. The half-tooth ring 205 meshes with multiple evenly distributed driven gears 206 to realize the power diversion and transmission. Each driven gear 206 then meshes with the corresponding driven rack 207 to convert the rotational motion into linear motion again, forming an efficient power transmission chain. The drive rack 204 and multiple driven racks 207 drive the corresponding detection heads 4 respectively, realizing the synchronous movement of multiple sets of detection heads 4. Through the linkage design of the driving gear 203, the semi-tooth ring 205, and the driven gear 206, the detection head 4 can form a three-dimensional detection coverage, performing multi-position detection of oxides on and near the surface of the pipe. Compared with traditional single-point detection, it can improve detection efficiency, while avoiding the tedious operation of repeated adjustments in manual detection, reducing the mental and physical exertion of operators, and the simultaneous detection of multiple points at the same position further improves detection efficiency.

[0035] The lower surface of the testing frame 1 is fixedly connected to the drive motor 201, and the rotating shaft 202 passes through the interior of the testing frame 1.

[0036] The lower surface of the testing frame 1 is fixedly connected to the drive motor 201, ensuring that the drive motor 201 remains tightly fitted to the testing frame 1 after installation, preventing vibration and displacement during operation. A stepped through-hole is provided at the point where the rotating shaft 202 passes through the testing frame 1, with a reasonable gap reserved between the hole wall and the rotating shaft 202. This allows for both unimpeded rotation of the rotating shaft 202 and initial radial restraint. Dustproof sealing rings are provided at both the inlet and outlet of the through-hole, and a protective cover is provided on the exterior of the drive motor 201. To further protect the drive motor 201, an additional protective cover (not shown in the diagram) is also provided. This protective cover is made of high-strength cold-rolled steel plate, bent and formed, and fixed to the lower surface of the testing frame 1 with bolts. It effectively resists damage to the motor from external impacts and splashes. Additionally, honeycomb-shaped heat dissipation holes are provided on the side walls and top of the protective cover to ensure rapid heat dissipation during motor operation.

[0037] The inside of the testing frame 1 is provided with an annular groove 10, and the inside of the annular groove 10 is provided with an annular guide block 11. The side wall of the half tooth ring 205 is fixedly connected to the annular guide block 11. The annular guide block 11 cooperates with the annular groove 10 to guide and limit the circumferential movement of the half tooth ring 205.

[0038] The annular groove 10 is precision machined, and its inner surface is hardened and polished to a high gloss level to ensure smoothness during movement and reduce frictional resistance. The annular guide block 11 is made of high-strength steel and is fixed to the half-tooth ring 205 by welding. The weld is strong and not easy to crack. The annular guide block 11 and the annular groove 10 adopt a precise transition fit to ensure that the half-tooth ring 205 can rotate flexibly. When the half-tooth ring 205 moves in the circumferential direction, the annular guide block 11 always slides against the inner wall of the annular groove 10, so that the center distance between the half-tooth ring 205 and the driven gear 206 remains constant, avoiding the fluctuation of meshing clearance caused by the change of center distance, thereby preventing transmission impact and noise generation.

[0039] Meanwhile, when the semi-tooth ring 205 drives multiple driven gears 206, it is subjected to a reverse force. The cooperation between the annular guide block 11 and the annular groove 10 can effectively counteract this force, preventing the semi-tooth ring 205 from tilting or jamming, and ensuring that the roundness error of its motion trajectory is small. The bottom of the annular groove 10 is also provided with a lubrication oil channel, and the operator can periodically inject special grease to reduce the friction and wear between the annular guide block 11 and the annular groove 10, and ensure the long-term stable operation of the transmission component 2.

[0040] The inside of the testing frame 1 is provided with a first guide groove 5. The end of the active rack 204 away from the active gear 203 is fixedly connected to a first guide block 6. The inner surface of the first guide groove 5 is slidably connected to the first guide block 6. The inside of the testing frame 1 is provided with a second guide groove 7. The inner surface of the second guide groove 7 is slidably connected to the first guide block 6.

[0041] The first guide groove 5 and the second guide groove 7 are arranged in parallel. The groove shape adopts a T-shaped structure with excellent stability. The inner surface is treated with quenching and grinding to improve wear resistance. The first guide block 6 is a boss structure that matches the T-shaped groove and is firmly connected to the active rack 204, forming a stable support within the second guide groove 7. When the active rack 204 moves in a straight line, it will not deflect due to the meshing reaction force, ensuring that the straightness error of its motion trajectory is small.

[0042] The testing frame 1 has a third guide groove 8 inside. The driven rack 207 is fixedly connected to a second guide block 22 at the end away from the driven gear 206. The inner surface of the third guide groove 8 is slidably connected to the second guide block 22. The testing frame 1 has a fourth guide groove 9 inside. The inner surface of the fourth guide groove 9 is slidably connected to the second guide block 22.

[0043] The design of the third guide groove 8 and the fourth guide groove 9 is consistent with that of the active rack 204. The connection between the second guide block 22 and the driven rack 207 ensures the synchronicity of the movement of multiple driven racks 207. At the same time, it realizes the precise radial adjustment of the detection head 4. When facing austenitic stainless steel pipes of different diameters, it is only necessary to start the drive motor 201. The output end of the drive motor 201 rotates, driving the rotating shaft 202 and the half-tooth ring 205 to rotate in both directions, thereby driving the driven rack 207 to extend and retract, thereby adjusting the spacing of the detection head 4 to fit the outer wall of the pipe of different diameters. The whole adjustment process is fast and efficient. At the same time, it can detect austenitic stainless steel pipes of different specifications, reducing the economic cost for users to purchase multiple sets of equipment due to changes in pipe size, and improving the resource utilization rate of the equipment.

[0044] The active rack 204 and the driven rack 207 are both fixedly connected to the detection head 4 at one end near the central detection cavity 20 via the first connecting block 3. The detection frame 1 has an opening slot 21 inside.

[0045] The first connecting block 3 is made of lightweight and high-strength aluminum alloy. The opening slot 21 is a notch design with rounded transitions on the slot wall, which effectively avoids scratching the pipe surface. At the same time, the opening slot 21 is connected to the central detection chamber 20, allowing the pipe to be quickly inserted from the side without disassembling the pipes or equipment connected at both ends, simplifying the inspection process. When it is necessary to inspect a running stainless steel pipe, the operator only needs to insert the device into the pipe through the opening slot 21. After starting the device, the detection head 4 fits against the pipe wall and completes circumferential and radial inspection. After the inspection is completed, the drive motor 201 is started to rotate in the reverse direction, which in turn causes the half-tooth ring 205 to rotate in the reverse direction and reset, driving the driven gear 206 to mesh in the reverse direction. This causes the driven rack 207 to drive the detection head 4 to retract radially and separate from the outer wall of the pipe. At this time, the operator can easily remove the device from the pipe through the opening slot 21. The entire removal and unloading process does not require interruption of pipe operation or adjustment of the pipe. The entire inspection process is simple and convenient to operate.

[0046] The inside of the testing frame 1 is provided with a groove 12, and a fixing frame 13 is fixedly connected to the bottom inner wall of the groove 12. A bearing 14 is fixedly connected to the side surface of the rotating shaft 202, and the upper surface of the bearing 14 is fixedly connected to the fixing frame 13.

[0047] The fixed frame 13 is welded from high-strength steel plate. The bearing 14 is a deep groove ball bearing with dustproof and pollution-proof properties. Its inner ring is interference-fitted with the rotating shaft 202, and its outer ring is connected to the mounting hole of the fixed frame 13 through transition fit. The bearing 14 ensures smooth rotation of the rotating shaft 202. The two ends of the rotating shaft 202 are respectively connected to the drive motor 201 and the bearing 14 on the fixed frame 13. This structure reduces the frictional resistance when the rotating shaft 202 rotates, while ensuring transmission accuracy, providing a basic guarantee for the precise movement of the detection head 4.

[0048] A lithium battery 15 is fixedly connected to the lower surface of the testing frame 1, a transmission line 17 is fixedly connected to the lower surface of the testing frame 1, a controller 18 is fixedly connected to the end of the transmission line 17 away from the testing frame 1, a display screen 19 is provided on the upper surface of the controller 18, and a handle 16 is fixedly connected to the side surface of the testing frame 1.

[0049] The lithium battery 15 is equipped with a dedicated protection board and has comprehensive overcharge, over-discharge, overcurrent, and short-circuit protection functions, effectively ensuring battery safety. The transmission line 17 uses shielded twisted-pair cable with excellent anti-interference performance, wrapped with multiple layers of insulation sheath and a metal braided shielding layer, providing excellent shielding and effectively resisting various electromagnetic interferences in industrial environments. This ensures stable and distortion-free transmission of the detection signal, and the transmission distance meets the needs of on-site operation, allowing operators to observe the detection results in a safe area. In this application, the drive motor 201, display screen 19, detection head 4, lithium battery 15, miniature piezoresistive pressure sensor 27, miniature solenoid valve 30, and electrode integrated module 35 are all electrically connected to the controller 18. The controller 18 features a portable design, is compact and lightweight, making it easy to carry and operate. It incorporates a high-performance microprocessor and PLC control system, providing high-speed data processing and precise logic control capabilities. It can synchronously process electrical signals transmitted from multiple detection heads 4. The portable design, the configuration of the built-in high-performance microprocessor and PLC control system, and the data processing method for synchronously processing electrical signals are all existing technologies in the field. The handle 16 is ergonomically designed to fit the curvature of the hand, and its surface features an anti-slip texture to effectively increase friction between the hand and the handle 16, preventing slippage and improving operational safety.

[0050] A second connecting block 23 is fixedly connected to the side surface of the detection head 4. A spherical groove 24 is provided inside the second connecting block 23. A ball bearing 25 is provided inside the spherical groove 24. A placement groove 26 is provided inside the second connecting block 23. A miniature piezoresistive pressure sensor 27 is fixedly connected to the inner surface of the placement groove 26.

[0051] The second connecting block 23 is made of high-strength wear-resistant cast iron. The second connecting block 23 is rigidly connected to the side surface of the detection head 4 to ensure that there is no relative displacement when moving synchronously with the detection head 4. The spherical groove 24 is formed by precision grinding process. The spherical groove 24 can ensure that the ball 25 can rotate freely in 360°, and can limit the axial movement of the ball 25 to ≤0.5mm, so as to prevent the ball 25 from falling off when the detection head 4 moves along the circumference of the pipe. The ball 25 can reduce the wear on the surface of the pipe. The miniature piezoresistive pressure sensor 27, model Honeywell 123PC01D36, is fixed in the placement groove 26 by thermally conductive insulating adhesive. The sensing surface of the miniature piezoresistive pressure sensor 27 is aligned with the top of the ball bearing 25. The height of the ball bearing 25 protruding from the surface of the second connecting block 23 is 0.3-0.5mm higher than the height of the electric field sensing probe 33 protruding from the surface of the detection head 4. When the detection head 4 approaches the pipe wall, the ball bearing 25 will contact the pipe wall before the electric field sensing probe 33. At this time, the miniature piezoresistive pressure sensor 27 senses the contact pressure of the ball bearing 25. The controller 18 adjusts the output of the drive motor 201 in real time according to the pressure value so that when the detection head 4 stops moving, the ball bearing 25 adheres to the pipe wall with the set pressure, thereby maintaining a safe gap of 0.3-0.5mm between the electric field sensing probe 33 and the pipe wall, completely avoiding direct friction between 33 and the pipe wall.

[0052] The upper surface of the second connecting block 23 is fixedly connected to an oil storage tank 28, the lower surface of the oil storage tank 28 is fixedly connected to an oil outlet pipe 29, the inside of the oil outlet pipe 29 is equipped with a miniature solenoid valve 30, the upper surface of the oil storage tank 28 is fixedly connected to an inlet pipe 31, and the side surface of the inlet pipe 31 is equipped with a pipe cap 32.

[0053] The oil outlet pipe 29 is a φ1mm stainless steel capillary tube, with one end connected to the bottom of the oil reservoir 28 and the other end extending to the inner wall of the spherical groove 24, ensuring that the grease in the oil reservoir 28 can be accurately dripped onto the contact surface between the ball 25 and the spherical groove 24. The miniature solenoid valve 30 is integrated in the middle section of the oil outlet pipe 29 and is electrically connected to the controller 18. The pipe cap 32 adopts a spiral design with a silicone sealing gasket on the inside. The operator can replenish the grease through the feed pipe 31.

[0054] An electric field induction probe 33 is provided on the detection head 4, and an electrode chamber 34 is provided inside the detection head 4. An electrode integrated module 35 is provided inside the electrode chamber 34.

[0055] The electric field sensing probe 33 is fixed to the side of the detection head 4 near the tube wall by an insulating bracket. The probe 33 contains two gold-plated electrode plates spaced 0.1 mm apart, capable of capturing the weak electric field distortion caused by differences in conductivity of the oxides on the stainless steel tube surface. The electrode chamber 34 is a sealed cavity inside the detection head 4, made of aluminum alloy with a 0.2 mm thick ceramic insulating layer. A dustproof and breathable membrane is installed at the top of the chamber, and four φ2 mm wire holes are opened at the bottom, each fitted with a silicone sealing ring to prevent external moisture and impurities from affecting electrode performance. The electrode integration module 35 is the core component of the electrode chamber 34. It consists of an excitation coil power supply electrode, a Hall sensor signal electrode, and an electric field sensing probe signal electrode. All electrodes are fixed to a ceramic substrate by epoxy potting, and the substrate is isolated from the inner wall of the electrode chamber 34 by insulating pillars. The detection principle and core structure of the electric field induction probe 33 belong to the existing technology in the field of electrical parameter detection in non-destructive testing. The composition and fixing method of the electrode integrated module 35 belong to the existing technology of conventional modular design of electrical components of testing equipment.

[0056] When using this device, the austenitic stainless steel tube to be tested passes through the opening slot 21 and enters the central detection chamber 20. The operator starts the drive motor 201. The output end of the drive motor 201 drives the rotating shaft 202, the drive gear 203, and the half-gear ring 205 to rotate. The rotation of the drive gear 203 drives the drive rack 204, the first connecting block 3, and the detection head 4 to move. At the same time, the rotation of the half-gear ring 205 drives multiple sets of driven gears 206 to rotate. The movement of the driven rack 207 drives multiple sets of first connecting blocks 3 and detection heads 4 to move, bringing the multiple sets of first connecting blocks 3 and detection heads 4 closer to the austenitic stainless steel tube to a suitable position. The movement of the multiple sets of first connecting blocks 3 and detection heads 4 can detect tubes of different sizes. For small austenitic stainless steel tubes, limit detection is performed. The operator moves the handle 16 by hand. Multiple sets of first connecting blocks 3 and detection heads 4 can be used to detect multiple points on the austenitic stainless steel tubes to be tested. At the same time, the detection frame 1 is moved along the austenitic stainless steel tubes to be tested, and multiple points on the austenitic stainless steel tubes at different positions can be tested. The detection data can be viewed on the display screen 19 on the controller 18. After the test is completed, the drive motor 201 is started. The output end of the drive motor 201 rotates in reverse, driving the rotating shaft 202, the drive gear 203, and the half-tooth ring 205 to rotate, so that the half-tooth ring 205 is reset, and the austenitic stainless steel tube can pass through the opening slot 21.

Claims

1. A non-destructive testing device for the oxide magnetic properties of austenitic stainless steel pipes, comprising a testing frame (1), characterized in that, The detection frame (1) is provided with a central detection cavity (20) inside. The detection frame (1) is provided with a transmission assembly (2). The transmission assembly (2) is used to drive the detection head (4) to move circumferentially and radially along the central detection cavity (20) to perform multi-dimensional magnetic detection on the austenitic stainless steel tube in the central detection cavity (20). The transmission assembly (2) includes a drive motor (201) and a driven gear (206). The output end of the drive motor (201) is fixedly connected to a drive gear (203) through a rotating shaft (202). The side surface of the drive gear (203) is meshed with a drive rack (204). The side surface of the driven gear (206) is meshed with a half-tooth ring (205). The side surface of the driven gear (206) is meshed with a driven rack (207). The active rack (204) and the driven rack (207) are both fixedly connected to the detection head (4) at the end near the central detection cavity (20) by the first connecting block (3). The detection frame (1) is provided with an opening groove (21) inside. The detection frame (1) is provided with an annular groove (10) inside. The annular groove (10) is provided with an annular guide block (11) inside. The detection head (4) has a second connecting block (23) fixedly connected to its side surface. The second connecting block (23) has a spherical groove (24) inside. The spherical groove (24) has a ball (25) inside. The second connecting block (23) has a placement groove (26) inside. The inner surface of the placement groove (26) has a miniature piezoresistive pressure sensor (27) fixedly connected to it. The upper surface of the second connecting block (23) has an oil tank (28) fixedly connected to it. The lower surface of the oil tank (28) has an oil outlet pipe (29) fixedly connected to it. The oil outlet pipe (29) has a miniature solenoid valve (30) inside.

2. The non-destructive testing device for the oxide magnetic properties of austenitic stainless steel pipe according to claim 1, characterized in that, The sidewall of the semi-tooth ring (205) is fixedly connected to the annular guide block (11). The annular guide block (11) cooperates with the annular groove (10) to guide and limit the circumferential movement of the semi-tooth ring (205). The lower surface of the detection frame (1) is fixedly connected to the drive motor (201). The rotating shaft (202) penetrates the interior of the detection frame (1).

3. The non-destructive testing device for the oxide magnetic properties of austenitic stainless steel pipe according to claim 1, characterized in that, The detection frame (1) is provided with a first guide groove (5) inside. The end of the active rack (204) away from the active gear (203) is fixedly connected to a first guide block (6). The inner surface of the first guide groove (5) is slidably connected to the first guide block (6).

4. The non-destructive testing device for the oxide magnetic properties of austenitic stainless steel pipe according to claim 3, characterized in that, The inside of the detection frame (1) is provided with a second guide groove (7), and the inner surface of the second guide groove (7) is slidably connected to the first guide block (6).

5. The non-destructive testing device for the oxide magnetic properties of austenitic stainless steel pipe according to claim 1, characterized in that, The detection frame (1) is provided with a third guide groove (8) inside. The driven rack (207) is fixedly connected to a second guide block (22) at the end away from the driven gear (206). The inner surface of the third guide groove (8) is slidably connected to the second guide block (22).

6. The non-destructive testing device for the oxide magnetic properties of austenitic stainless steel pipe according to claim 5, characterized in that, The inside of the detection frame (1) is provided with a fourth guide groove (9), and the inner surface of the fourth guide groove (9) is slidably connected to the second guide block (22).

7. The non-destructive testing device for the oxide magnetic properties of austenitic stainless steel pipe according to claim 1, characterized in that, The inside of the detection frame (1) is provided with a groove (12), and a fixing frame (13) is fixedly connected to the bottom inner wall of the groove (12). A bearing (14) is fixedly connected to the side surface of the rotating shaft (202), and the upper surface of the bearing (14) is fixedly connected to the fixing frame (13).

8. The non-destructive testing device for the oxide magnetic properties of austenitic stainless steel pipe according to claim 7, characterized in that, A lithium battery (15) is fixedly connected to the lower surface of the testing frame (1), a transmission line (17) is fixedly connected to the lower surface of the testing frame (1), a controller (18) is fixedly connected to the end of the transmission line (17) away from the testing frame (1), a display screen (19) is provided on the upper surface of the controller (18), and a handle (16) is fixedly connected to the side surface of the testing frame (1).

9. The non-destructive testing device for the oxide magnetic properties of austenitic stainless steel pipe according to claim 1, characterized in that, The upper surface of the oil storage tank (28) is fixedly connected to the feed pipe (31), the side surface of the feed pipe (31) is provided with a pipe cap (32), the detection head (4) is provided with an electric field induction probe (33), the inside of the detection head (4) is provided with an electrode chamber (34), and the inside of the electrode chamber (34) is provided with an electrode integrated module (35).

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