Detection device for probe fit pressure pickup for saddle j weld

Abstract

The present application relates to the technical field of nondestructive testing, and discloses a detection device for probe fitting pressure pickup of a saddle-shaped J weld; the detection device realizes accurate movement and adaptive fitting of a complex curved surface in a narrow space through cooperation of a sliding support mechanism, a rotary ring driving mechanism, a radial driving mechanism and a probe mechanism; the probe mechanism adopts a combined structure of an elastic swing plate, a spring shaft, an adjusting spring and a flexible film pressure sensor, so that a film array eddy current probe can dynamically adapt to curved surface changes, ensure that the film array eddy current probe and a surface of a weld to be detected are always closely fitted without a gap, and directly and real-timely pick up real contact pressure distribution of an entire probe detection end face, solve the problems of uneven pressure of traditional rigid clamping and inaccurate indirect measurement, provide stable coupling conditions and accurate pressure feedback for ultrasonic detection, and improve the precision and reliability of automatic nondestructive detection of a saddle-shaped J weld.

Description

Technical Field

[0001] This invention relates to the field of nondestructive testing technology, and more specifically to a testing device for probe contact pressure pickup in saddle-shaped J-welds. Background Technology

[0002] To ensure national energy security, implement the "dual-carbon" strategy, optimize the energy structure, and address global energy transition and power supply demands, nuclear power, as a clean, low-carbon, stable, and efficient baseload energy source, has become a key component of the nation's modern energy system. The object to be inspected within nuclear power plant pressure vessels is a welded structure of two cylinders. The saddle-shaped J-weld formed by this weld is a critical structure of the pressure vessel. Internal defect detection typically employs an ultrasonic array method. During inspection, the contact state between the array probe and the weld surface, as well as the stability of the contact pressure, directly affects the ultrasonic coupling effect and signal quality, making it a core factor determining the inspection accuracy.

[0003] Currently, commonly used probe clamping and pressing mechanisms mostly adopt rigid or simple elastic structures, which are difficult to adapt to the complex morphology of saddle-shaped curved surfaces. This can easily lead to poor probe fit and uneven pressure distribution, making it impossible to perform full coverage detection around the circumference, resulting in signal attenuation and detection errors. Traditional pressure detection often relies on indirect estimation or single-point measurement, which cannot accurately reflect the pressure distribution across the entire contact surface. This results in low accuracy and poor real-time performance, making it difficult to achieve real-time pressure feedback and closed-loop control.

[0004] Furthermore, some adaptive mechanisms are complex in structure and large in size, making them difficult to place in the confined space of the weld. The sensors are also susceptible to environmental interference, and their overall integration and long-term stability are insufficient. These limitations prevent them from meeting the real-time monitoring requirements for probe contact in automated inspection, thus hindering further improvements in the accuracy and efficiency of automated ultrasonic testing of saddle-shaped J-welds. Therefore, there is an urgent need for a detection device for saddle-shaped J-welds that can adapt to confined spaces while achieving real-time, accurate, and full-coverage contact detection. Summary of the Invention

[0005] To overcome the aforementioned technical problems, this invention provides a detection device for probe contact pressure pickup in saddle-shaped J-welds. This device, through the coordinated operation of a sliding support mechanism, a rotating ring drive mechanism, a radial drive mechanism, and a probe mechanism, achieves precise multi-degree-of-freedom motion and adaptive contact with complex curved surfaces within a confined space. The probe mechanism employs a combination structure of an elastic swing plate, a spring shaft, an adjusting spring, and a flexible thin-film pressure sensor. This allows the thin-film array eddy current probe to dynamically adapt to surface changes, ensuring a tight, gapless contact between the probe and the weld surface under test. It directly and in real-time picks up the actual contact pressure distribution across the entire probe detection end face, solving the problems of uneven pressure and inaccurate indirect measurements associated with traditional rigid clamping. This provides stable coupling conditions and precise pressure feedback for ultrasonic testing, improving the accuracy and reliability of automated non-destructive testing of saddle-shaped J-welds.

[0006] To achieve the above objectives, the present invention provides a detection device for probe contact pressure pickup in saddle-shaped J-welds, the detection device comprising: A sliding support mechanism is disposed below the workpiece to be measured. The sliding support mechanism includes an inner support assembly and an outer sliding arm assembly. The outer sliding arm assembly is vertically sleeved and slidably connected to the outside of the inner support assembly. A rotating ring drive mechanism is provided, wherein a fixed ring at the bottom of the rotating ring drive mechanism is fixedly disposed above the outer sliding arm assembly, and a rotating ring at the top of the rotating ring drive mechanism is provided to be rotatably connected to the fixed ring, and the rotating ring drive mechanism drives the rotating ring to rotate. A radial drive mechanism is provided, wherein a fixed base at the bottom of the radial drive mechanism is fixedly disposed on the top of the rotating ring, and a probe connecting seat is provided on the top of the radial drive mechanism and slidably connected to the fixed base. The radial drive mechanism drives the probe connecting seat to move closer to or further away from the center of the rotating ring and project it onto the center of the projection circle of the plane in which the radial drive mechanism is located. A probe mechanism, located on top of the probe connector, rotates to fit the saddle-shaped J-weld for omnidirectional pressure testing when the outer sliding arm assembly and the rotating ring drive mechanism rise and are sleeved around the workpiece to be tested. The probe mechanism includes: The probe bracket has its bottom fixedly connected to the probe connector, and a circular groove is provided in the middle of the probe bracket, with the top of the probe bracket offset towards the center of the rotating ring. An elastic swing plate, which is rotatably hinged to the top of the probe bracket; A spring shaft, with its two ends respectively located in the circular groove and on the side of the elastic swing plate near the probe bracket, and the diameter of the spring shaft being smaller than the diameter of the circular groove; An adjusting spring, wherein the adjusting spring is sleeved on the central shaft of the spring; A flexible thin-film pressure sensor, wherein the non-detection end face of the flexible thin-film pressure sensor is bonded to the other side of the elastic swing plate; A thin-film array eddy current probe, wherein the non-detection end face of the thin-film array eddy current probe is bonded to the detection end face of the flexible thin-film pressure sensor, and the detection end face of the thin-film array eddy current probe is used to fit and detect saddle-shaped J-welds.

[0007] Preferably, the sliding support mechanism includes: An inner support assembly, wherein vertical sliding guide rails are respectively provided on both sides of the inner support assembly; A vertical drive assembly is vertically disposed at one end of the inner support assembly, and the vertical drive assembly is provided with a vertical lead screw parallel to the inner support assembly; An outer sliding arm assembly is sleeved outside the inner support assembly and outside the vertical drive assembly. The bottom and middle of both sides of the inner wall of the outer sliding arm assembly are provided with fixed assembly blocks that are slidably connected to the vertical sliding guide rail. A vertical lead screw nut connected to the vertical lead screw is provided at the bottom of one end of the inner wall of the outer sliding arm assembly, which is used by the vertical drive assembly to drive the vertical lead screw to move the outer sliding arm assembly up and down along the vertical sliding guide rail.

[0008] Preferably, the internal support component includes: Support base; The support cylinder is sleeved and fixedly mounted on the support base; The inner lining of the cylinder is fitted onto the top of the inner wall of the supporting cylinder; Four sets of vertical sliding guide rails are provided on each side of the outer wall of the support cylinder, with two sets of parallel vertical sliding guide rails on each side.

[0009] Preferably, the vertical drive component includes: A vertical drive motor is located at the bottom of one end of the inner support assembly; A coupling, one end of which is connected to the output shaft of the vertical drive motor; A vertical lead screw, one end of which is connected to the other end of the coupling for transmission. A lead screw holder is disposed on the top of one end of the inner support assembly, and the lead screw holder is drively connected to the other end of the vertical lead screw.

[0010] Preferably, the outer sliding arm assembly includes: The outer sliding arm cylinder is sleeved on the outside of the inner support assembly; A vertical lead screw nut is fixedly installed at the bottom of one side of the inner wall of the outer sliding arm cylinder opposite to the vertical drive assembly, and is connected to the vertical lead screw for transmission. Four sets of fixed assembly blocks are respectively fixedly installed on the bottom and middle of both sides of the inner wall of the outer sliding arm cylinder, and are used to slide and connect the vertical sliding guide rail.

[0011] Preferably, the outer sliding arm cylinder includes: Two sets of sliding arm grooves, with the front faces of the two sets of sliding arm grooves arranged vertically and parallel to each other; Four sets of sliding arm connecting plates are fixedly connected at both ends to the top and bottom of the two sets of sliding arm grooves, forming a hollow outer sliding arm cylinder.

[0012] Preferably, the fixed assembly block includes: A sliding connecting frame, one end of which is fixedly disposed on the inner wall of the outer sliding arm cylinder; Two sets of sliders, one end of each set of sliders is fixedly mounted parallel to the other end of the sliding connecting frame, and the other ends of each set of sliders are slidably connected to two sets of vertical sliding guide rails that are parallel to each other on the same side of the supporting cylinder.

[0013] Preferably, the rotating ring drive mechanism includes: Two turntable connecting blocks are respectively disposed on both sides of the top of the outer sliding arm assembly; A retaining ring is disposed at the top of the two turntable connecting blocks; A rotating ring is positioned above the fixed ring, and the centers of the rotating ring and the fixed ring coincide. A large gear ring is sleeved around the rotating ring, and the centers of the large gear ring and the rotating ring coincide. A limiting ring is disposed between the rotating ring and the fixed ring to limit the rotation ring along its axis; A drive gear is located on one side of the large gear ring and meshes with the large gear ring for transmission. A gear cover is disposed above the drive gear and is fixedly connected to one side of the retaining ring; A rotary drive motor is located below the drive gear and is connected to the drive gear in a transmission manner.

[0014] Preferably, the radial drive mechanism includes: A fixing seat is fixedly disposed on the top of the rotating ring; Two sets of lower radial sliding guide rails are fixedly connected at intervals to the middle of the top of the fixed base; Two sets of upper radial sliding guide rails, the bottom of the two sets of upper radial sliding guide rails respectively corresponding to the top of the two sets of lower radial sliding guide rails; The probe connector is fixedly connected to the top of the two sets of upper radial sliding guide rails on both sides of its bottom. A radial lead screw box is disposed on one side of the top of the fixed base; A radial lead screw, wherein the radial lead screw is disposed within the radial lead screw box, and the arrangement direction of the radial lead screw points towards the center of the projected circle; A radial lead screw nut, wherein the radial lead screw nut is drivingly connected to the radial lead screw and one side of the radial lead screw nut is fixedly connected to one side of the probe connecting seat; A radial drive motor is connected to the end of the radial lead screw away from the projection center, and is used to drive the probe connector to move closer to or away from the projection center.

[0015] Through the above technical solution, the detection device is equipped with a sliding support mechanism, a rotating ring drive mechanism, a radial drive mechanism, and a probe mechanism working together. The sliding support mechanism can be raised and lowered to fit around the product under test, providing vertical positioning and support. The rotating ring drive mechanism is installed on top of the sliding support mechanism, driving the rotating ring to move in a circumferential direction. The radial drive mechanism is fixed on the rotating ring, driving the probe connecting seat and probe mechanism on it to perform radial feed and retraction movements. Through precise driving of three degrees of freedom—lifting, rotation, and radial—it is ensured that the probe can reach and cover the complex spatial position of the weld, meeting the requirements of the confined space in nuclear power plant sites. It has high integration and flexible movement, significantly improving the accuracy, reliability, and efficiency of automated detection. The probe mechanism uses a bottom-hinged elastic swing plate, a spring shaft, an adjusting spring, and a top flexible thin-film pressure sensor and thin-film array eddy current. The probe's composite structure enables quantitative calibration of pre-tightening force before testing, real-time acquisition of pressure distribution data across the entire contact surface throughout the testing stroke, and online monitoring of the contact state. This avoids testing deviations caused by abnormal contact pressure. Simultaneously, during the full circumferential testing process, it adapts in real-time to the contour changes of complex curved weld surfaces with varying curvatures, ensuring that the thin-film array eddy current probe and the surface of the weld under test maintain a tight, gapless contact. This eliminates coupling gap errors at the source and effectively suppresses the eddy current detection lift-off effect, completely solving the core technical problems of signal distortion, missed defects, and false detections caused by poor contact in curved weld surface testing. The device features a compact overall structure, stable operation, and strong adaptability to various working conditions. It can be directly integrated into various automated circumferential scanning continuous testing operations without requiring customized tooling for welds with different curvatures and specifications, significantly reducing testing costs and improving operational efficiency. Attached Figure Description

[0016] Figure 1This is a schematic diagram of a detection device for probe contact pressure pickup for saddle-shaped J-welds according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the probe mechanism of a detection device for probe contact pressure pickup for saddle-shaped J-welds according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the sliding support mechanism of a detection device for probe contact pressure pickup in saddle-shaped J-welds according to an embodiment of the present invention. Figure 4 This is an exploded structural diagram of the inner support assembly of the sliding support mechanism of a detection device for probe contact pressure pickup of a saddle-shaped J-weld, according to an embodiment of the present invention. Figure 5 This is an exploded structural diagram of the vertical drive assembly of the sliding support mechanism of a detection device for probe contact pressure pickup in a saddle-shaped J-weld, according to an embodiment of the present invention. Figure 6 This is an exploded structural diagram of the outer sliding arm assembly of the sliding support mechanism of a detection device for probe contact pressure pickup in a saddle-shaped J-weld, according to an embodiment of the present invention. Figure 7 This is an exploded structural diagram of the rotating ring drive mechanism of a detection device for probe contact pressure pickup in a saddle-shaped J-weld according to an embodiment of the present invention. Figure 8 This is a schematic diagram of the radial drive mechanism of a detection device for probe contact pressure pickup in saddle-shaped J-welds according to an embodiment of the present invention. Figure 9 This is a schematic diagram of the operation of a detection device for picking up probe contact pressure for saddle-shaped J-welds according to an embodiment of the present invention, which is fitted onto the workpiece to be tested.

[0017] Explanation of reference numerals in the attached figures 1. Sliding support mechanism; 2. Rotary ring drive mechanism; 3. Radial drive mechanism; 4. Probe mechanism; 11. Inner support assembly; 12. Vertical drive assembly; 13. Outer sliding arm assembly; 21. Turntable connecting block; 22. Fixed ring; 23. Rotary ring; 24. Large gear ring; 25. Limiting ring; 26. Drive gear; 27. Gear cover; 28. Rotary drive motor; 31. Fixed seat; 32. Lower radial sliding guide rail; 33. Upper radial sliding guide rail; 34. Probe connecting seat; 35. Radial lead screw box; 36. Radial lead screw; 37. Radial lead screw nut; 38. Radial drive motor; 41. Probe support 42. Elastic swing plate; 43. Spring central shaft; 44. Adjusting spring; 45. Flexible thin film pressure sensor; 46. Thin film array eddy current probe; 111. Support base; 112. Support cylinder; 113. Cylinder inner liner; 114. Vertical sliding guide rail; 121. Vertical drive motor; 122. Coupling; 123. Vertical lead screw; 124. Lead screw frame; 131. Outer sliding arm cylinder; 132. Vertical lead screw nut; 133. Fixed assembly block; 411. Circular groove; 1311. Sliding arm groove; 1312. Sliding arm connecting plate; 1331. Sliding connecting frame; 1332. Slider. Detailed Implementation

[0018] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0019] like Figure 1 The diagram shown is a schematic representation of a detection device for probe contact pressure pickup in a saddle-shaped J-weld according to an embodiment of the present invention; as shown... Figure 2 The diagram shown is a schematic structural diagram of the probe mechanism of a detection device for probe contact pressure pickup in a saddle-shaped J-weld according to an embodiment of the present invention; as shown... Figure 9 The diagram shows a schematic representation of the operation of a probe-fitting pressure pickup detection device for saddle-shaped J-welds, according to an embodiment of the present invention, when it is fitted onto the workpiece to be tested. Figure 1 , 2 In addition to 9, the detection device may include a sliding support mechanism 1, a rotating ring drive mechanism 2, a radial drive mechanism 3, and a probe mechanism 4. The probe mechanism 4 includes a probe bracket 41, an elastic swing plate 42, a spring central shaft 43, an adjusting spring 44, a flexible thin film pressure sensor 45, and a thin film array eddy current probe 46.

[0020] Specifically, the sliding support mechanism 1 is located below the workpiece to be measured, including an inner support assembly 11 and an outer sliding arm assembly 13. The outer sliding arm assembly 13 is vertically sleeved and slidably connected to the inner support assembly 11. The bottom fixed ring 22 of the rotating ring drive mechanism 2 is fixedly located above the outer sliding arm assembly 13. The top of the rotating ring drive mechanism 2 is provided with a rotating ring 23 that is rotatably connected to the fixed ring 22, and the rotating ring drive mechanism 2 drives the rotating ring 23 to rotate. The bottom fixed seat 31 of the radial drive mechanism 3 is fixedly located on the top of the rotating ring 23. The top of the radial drive mechanism 3 is provided with a probe connecting seat 34 that is slidably connected to the fixed seat 31, and the radial drive mechanism 3 drives the probe connecting seat 34 to approach or move away from the center of the rotating ring 23 onto the projection center of the plane where the radial drive mechanism 3 is located. The probe mechanism 4 is located on the top of the probe connecting seat 34 and is sleeved on the workpiece to be measured after the outer sliding arm assembly 13 and the rotating ring drive mechanism 2 rise. The outer periphery of the workpiece is rotated and fitted with the saddle-shaped J weld for all-round pressure testing; for the probe mechanism 4, the probe bracket 41, the bottom of the probe bracket 41 is fixedly connected to the probe connecting seat 34, and the middle of the probe bracket 41 is provided with a circular groove 411, and the top of the probe bracket 41 is biased towards the center of the rotating ring 23; the elastic swing plate 42 is rotatably hinged to the top of the probe bracket 41, and the two ends of the spring central shaft 43 are respectively set in the circular groove 411 and on the side of the elastic swing plate 42 near the probe bracket 41, and the diameter of the spring central shaft 43 is smaller than the diameter of the circular groove 411; the adjusting spring 44 is sleeved on the spring central shaft 43; the non-detection end face of the flexible thin film pressure sensor 45 is bonded to the other side of the elastic swing plate 42; the non-detection end face of the thin film array eddy current probe 46 is bonded to the detection end face of the flexible thin film pressure sensor 45, and the detection end face of the thin film array eddy current probe 46 is used to fit and detect the saddle-shaped J weld.

[0021] The sliding support mechanism 1 is located below the workpiece to be tested. Its outer sliding arm assembly 13 rises vertically along the inner support assembly 11, covering and lifting the entire upper detection mechanism to the inspection position outside the workpiece. The fixed ring 22 of the rotating ring drive mechanism 2 is installed on the top of the outer sliding arm assembly 13. The driven rotating ring 23 can rotate 360 ​​degrees, driving all the mechanisms above and realizing the circumferential movement of the probe mechanism 4 along the weld. The fixed seat 31 of the radial drive mechanism 3 is installed on the rotating ring 23. The driven probe connecting seat 34 can slide radially (closer to or away from the center) to adjust the distance between the probe and the weld surface. During detection, a basic normal pressure is applied to and maintained on the weld surface. The probe mechanism 4 is mounted on the probe connector 34. As an elastic swing system, the probe bracket 41 provides the mounting base, and its top hinge point allows the elastic swing plate 42 to swing. The spring shaft 43 and the adjusting spring 44 are key components for adaptive swing. The diameter of the shaft is smaller than the circular groove 411 on the bracket, which facilitates the compression of the adjusting spring 44 and provides space for swing. The adjusting spring 44 provides the swing restoring force and additional pressure fine-tuning. The flexible thin-film pressure sensor 45 and the thin-film array eddy current probe 46 are laminated and bonded to the front end of the elastic swing plate 42. During the detection process, after the radial drive mechanism 3 pushes the probe towards the weld surface, the elastic swing plate 42 can adapt to the curvature of the saddle-shaped J weld, ensuring that the detection end face of the thin-film array eddy current probe 46 is always stably attached to the weld. At the same time, the flexible thin-film pressure sensor 45 monitors and provides feedback on the attachment pressure in real time. The entire system can complete the all-round, highly consistent detection of the entire circumferential weld through coordinated movement.

[0022] Through the above technical solution, this detection device achieves omnidirectional automatic scanning of saddle-shaped J-welds via a coordinated sliding, rotating, and radial drive mechanism. The probe mechanism integrates a flexible thin-film pressure sensor and a thin-film array eddy current probe, enabling simultaneous high-precision detection of pressure distribution and internal defects. The elastic swing plate and adjusting spring design allow the probe to adaptively conform to the curved surface, ensuring detection stability and accuracy. The overall structure boasts a high degree of automation, significantly improving detection efficiency and reliability, making it suitable for non-destructive testing of complex welds.

[0023] like Figure 3 This is a schematic diagram of the sliding support mechanism of a detection device for probe contact pressure pickup in a saddle-shaped J-weld according to an embodiment of the present invention; as shown. Figure 4 This is an exploded structural diagram of the inner support assembly of the sliding support mechanism of a detection device for probe contact pressure pickup in a saddle-shaped J-weld according to an embodiment of the present invention; Figure 3 and 4In order to achieve vertical lifting of the device and ensure the overall stability of the device, in one embodiment of the present invention, the sliding support mechanism 1 includes a vertical drive assembly 12 and an outer sliding arm assembly 13; vertical sliding guide rails 114 are respectively provided on both sides of the inner support assembly 11; the vertical drive assembly 12 is vertically arranged at one end of the inner support assembly 11, and the vertical drive assembly 12 is provided with a vertical lead screw parallel to the inner support assembly 11; the outer sliding arm assembly 13 is sleeved on the outside of the inner support assembly 11 and the outside of the vertical drive assembly 12, and fixed assembly blocks 133 that are slidably connected to the vertical sliding guide rails 114 are provided on the bottom and middle of both sides of the inner wall of the outer sliding arm assembly 13; a vertical lead screw nut 132 connected to the vertical lead screw is provided at the bottom of one end of the inner wall of the outer sliding arm assembly 13, which is used for the vertical drive assembly 12 to drive the vertical lead screw to move the outer sliding arm assembly 13 up and down along the vertical sliding guide rails 114.

[0024] The inner support assembly 11, the vertical drive assembly 12, and the outer sliding arm assembly 13 work together. The inner support assembly 11 serves as a fixed column, with vertical sliding guide rails 114 on both sides to provide precise guidance for the entire movement. The vertical drive assembly 12 is vertically mounted at one end of the inner support assembly 11, and its vertical lead screw serves as a key component for power transmission. The outer sliding arm assembly 13 is a movable component, fitted around the inner support assembly 11, and its interior is slidably connected to the vertical sliding guide rails 114 via a fixed assembly block 133 to achieve linear motion. The vertical lead screw nut 132 at the bottom of the inner support assembly 11 engages with the vertical lead screw of the vertical drive assembly 12. When the vertical drive assembly 12 drives the vertical lead screw to rotate, the rotational motion is converted into precise linear lifting and lowering motion of the outer sliding arm assembly 13 along the guide rails through the transmission of the lead screw nut. This ensures that the rotational, radial drive, and probe mechanism 4 supported above can be stably and reliably vertically positioned relative to the workpiece being measured.

[0025] exist Figure 4To ensure the reliability of lifting and moving, and to prevent the device from collapsing or the outer sliding arm assembly 13 from shifting during sliding, in one embodiment of the present invention, the inner support assembly 11 includes a support base 111, a support cylinder 112, a cylinder inner liner 113, and four sets of vertical sliding guide rails 114. The support cylinder 112 is sleeved and fixedly mounted on the support base 111, and the cylinder inner liner 113 is fitted onto the top of the inner wall of the support cylinder 112. Two sets of parallel vertical sliding guide rails 114 are provided on each side of the outer wall of the support cylinder 112. The support base 111 is the mounting base of the entire device and is fixed to the testing platform or the ground. The support cylinder 112 (such as a large cylinder or frame) is fixedly mounted on the support base 111, forming the main load-bearing structure. The cylinder inner liner 113 is installed on the top of the inner wall of the support cylinder 112 to enhance local rigidity. Two sets of parallel vertical sliding guide rails 114 are provided on each side of the support cylinder 112, which cooperate with the slider 1332 in the outer sliding arm assembly 13 to form a stable four-point guiding structure. The symmetrical and multi-point guiding design can effectively prevent the outer sliding arm assembly 13 from deflecting, jamming or shaking during the lifting process, ensuring the linear accuracy and stability of the vertical movement.

[0026] like Figure 5 The diagram shown is an exploded view of the vertical drive assembly of the sliding support mechanism of a detection device for probe contact pressure pickup in a saddle-shaped J-weld according to an embodiment of the present invention; Figure 5 In this invention, considering the need to accurately locate the weld during inspection, in one embodiment, the vertical drive assembly 12 includes a vertical drive motor 121, a coupling 122, a vertical lead screw 123, and a lead screw frame 124. The vertical drive motor 121 is located at the bottom of one end of the inner support assembly 11. One end of the coupling 122 is connected to the output shaft of the vertical drive motor 121. One end of the vertical lead screw 123 is connected to the other end of the coupling 122. The lead screw frame 124 is located at the top of one end of the inner support assembly 11 and is connected to the other end of the vertical lead screw 123. The vertical drive motor 121, typically a servo motor or stepper motor, serves as the power source and can precisely control the speed and angle of rotation. The coupling 122 connects the motor's output shaft to one end of the vertical lead screw 123, transmitting torque and compensating for minor installation alignment errors. The rotational motion of the vertical lead screw 123 is converted into linear motion of the nut (and the external sliding arm assembly 13 fixed thereto) through threaded engagement with the lead screw nut inside the outer sliding arm assembly 13, thus achieving precise displacement control. The lead screw bracket 124, mounted on top of the inner support assembly 11, supports the other end of the vertical lead screw 123 (a bearing is typically installed inside the lead screw bracket 124), ensuring stable rotation of the lead screw and bearing axial and radial loads.

[0027] like Figure 6The diagram shown is an exploded view of the outer sliding arm assembly of the sliding support mechanism of a detection device for probe contact pressure pickup in a saddle-shaped J-weld according to an embodiment of the present invention; Figure 3 and 6 In order to be able to be fitted around the workpiece to be tested and to support related mechanisms, in one embodiment of the present invention, the outer sliding arm assembly 13 may include an outer sliding arm cylinder 131, a vertical screw nut 132, and four sets of fixed assembly blocks 133; the outer sliding arm cylinder 131 is fitted around the inner support assembly 11; the vertical screw nut 132 is fixedly disposed at the bottom of one side of the inner wall of the outer sliding arm cylinder 131 opposite to the vertical drive assembly 12, and is connected to the vertical screw 123 for transmission; the four sets of fixed assembly blocks 133 are respectively fixedly disposed at the bottom of both sides and the middle of the inner wall of the outer sliding arm cylinder 131, for sliding connection of the vertical sliding guide rail 114. The outer sliding arm assembly 13 is sleeved on the outside of the inner support assembly 11, forming a sleeve structure that can slide up and down. A vertical screw nut 132 is fixedly installed at the bottom of its inner wall, which meshes with the vertical screw 123, driving the outer sliding arm assembly 13 to achieve its own linear movement. Four sets of fixed assembly blocks 133 are set at the bottom and middle of both sides of the inner wall of the outer sliding arm cylinder 131, which precisely cooperate with the vertical sliding guide rail 114 on the inner support assembly 11. The fixed assembly blocks 133 at the bottom can bear the weight and overturning moment, while the fixed assembly blocks 133 in the middle can effectively increase the guide span, significantly improve the bending stiffness of the outer sliding arm assembly 13 during the lifting process, prevent it from being deformed or swaying too much due to the overhang load of the upper mechanism, and ensure the vertical movement accuracy and stability of the entire motion platform. exist Figure 6 In order to achieve a lightweight design and facilitate subsequent observation, installation, and maintenance of the device, in one embodiment of the invention, the outer sliding arm cylinder 131 may consist of two sets of sliding arm grooves 1311 and four sets of sliding arm connecting plates 1312. The two sets of sliding arm grooves 1311 are arranged vertically and parallel to each other on their front sides. The two ends of the four sets of sliding arm connecting plates 1312 are respectively fixedly connected to the top and bottom of the two sets of sliding arm grooves 1311, forming a hollow outer sliding arm cylinder 131. The hollow frame structure ensures sufficient rigidity while achieving lightweight design, reducing the power and inertia required for vertical drive. At the same time, the hollow structure provides space for internal wiring, making the equipment neater. Most importantly, the relatively open sides facilitate the installation, debugging, and maintenance of internal parts (such as the fixed assembly block 133, lead screw nut).

[0028] exist Figure 6In order to facilitate the replacement of the guide slider 1332 structure and reduce the cost of use, in one embodiment of the present invention, the fixed assembly block 133 may include a sliding connecting frame 1331 and sliders 1332; one end of the sliding connecting frame 1331 is fixedly disposed on the inner wall of the outer sliding arm cylinder 131; one end of the two sets of sliders 1332 is fixedly disposed parallel to the other end of the sliding connecting frame 1331, and the other end of the two sets of sliders 1332 is slidably connected to two sets of vertical sliding guide rails 114 on the same side of the support cylinder 112. A total of four sliders 1332 on the two fixed assembly blocks 133 (located at the bottom and middle of the outer sliding arm cylinder 131 respectively) cooperate with the two parallel guide rails on the same side; this configuration of double rails on each side and double sliders 1332 on each rail can effectively resist the torque in all directions and ensure that the outer sliding arm assembly 13 can only move along the guide rail direction (vertical direction).

[0029] like Figure 7 The diagram shown is an exploded view of the rotating ring drive mechanism of a detection device for probe contact pressure pickup in a saddle-shaped J-weld according to an embodiment of the present invention; Figure 7 In order to achieve the purpose of circumferential scanning of the weld seam by driving the probe mechanism 4 to make circular motion around the inspected workpiece, in one embodiment of the present invention, the rotating ring drive mechanism 2 includes two turntable connecting blocks 21, a fixed ring 22, a rotating ring, a large gear ring 24, a limiting ring 25, a drive gear 26, a gear cover 27, and a rotating drive motor 28; the two turntable connecting blocks 21 are respectively disposed on both sides of the top of the outer sliding arm assembly 13; the fixed ring 22 is disposed on the top of the two turntable connecting blocks 21; the rotating ring 23 is disposed above the fixed ring 22, and rotates... The centers of the rotating ring 23 and the fixed ring 22 coincide; the large gear ring 24 is sleeved around the rotating ring 23, and the centers of the large gear ring 24 and the rotating ring 23 coincide; the limiting ring 25 is disposed between the rotating ring 23 and the fixed ring 22, and is used to limit the rotating ring 23 along its axis; the driving gear 26 is disposed on one side of the large gear ring 24 and meshes with the large gear ring 24 for transmission; the gear cover 27 is disposed above the driving gear 26 and is fixedly connected to one side of the fixed ring 22; the rotary drive motor 28 is disposed below the driving gear 26 and is connected to the driving gear 26 for transmission.

[0030] The fixed ring 22 and rotating ring 23 of the rotating ring drive mechanism 2 achieve relative rotation on the same axis through the limiting ring 25. The fixed ring 22 is fixed to the top of the outer sliding arm assembly 13 through two turntable connecting blocks 21. The rotary drive motor 28 meshes with the large gear ring 24 through the drive gear 26 to form a gear pair transmission. When the motor rotates, it drives the drive gear 26, which in turn drives the large gear ring 24 and the rotating ring 23 fixed thereto to rotate together. The gear cover 27 is set above the drive gear 26 to provide dustproof and impact-proof safety protection. By converting the high speed and low torque output of the motor into the low speed and high torque rotational motion required by the rotating ring 23, the rotation angle and speed can be precisely controlled. This mechanism enables the entire radial drive mechanism 3 and probe mechanism 4 mounted on the rotating ring 23 to make precise circumferential motion around the axis of the inspected workpiece, realizing full coverage inspection of the weld.

[0031] Figure 8 This is a schematic diagram of the radial drive mechanism of a detection device for probe contact pressure pickup in a saddle-shaped J-weld according to an embodiment of the present invention; Figure 8In order to achieve the contact and fit of the probe mechanism 4 with the weld seam area, the probe mechanism 4 is radially fed and retracted relative to the surface of the product to be inspected. In one embodiment of the present invention, the radial drive mechanism 3 includes a fixed base 31, two sets of lower radial sliding guide rails 32, two sets of upper radial sliding guide rails 33, a probe connecting seat 34, a radial lead screw box 35, a radial lead screw 36, a radial lead screw nut 37, and a radial drive motor 38; the fixed base 31 is fixedly disposed on the top of the rotating ring 23; the two sets of lower radial sliding guide rails 32 are fixedly connected at intervals to the middle of the top of the fixed base 31; the bottom of the two sets of upper radial sliding guide rails 33 are respectively slidably connected to the top of the two sets of lower radial sliding guide rails 32; the ... to the top of the rotating ring 23; the probe connecting seat 34, a radial lead screw box 35, a radial lead screw 36, a radial lead screw nut 37, and a radial drive motor 3 The bottom of the base 34 is fixedly connected to the top of two sets of upper radial sliding guide rails 33 on both sides; a radial lead screw box 35 is disposed on one side of the top of the fixed base 31; a radial lead screw 36 is disposed inside the radial lead screw box 35, and the arrangement direction of the radial lead screw 36 points towards the projection center; a radial lead screw nut 37 is drivenly connected to the radial lead screw 36, and one side of the radial lead screw nut 37 is fixedly connected to one side of the probe connecting base 34; a radial drive motor 38 is drivenly connected to the end of the radial lead screw 36 away from the projection center, and is used to drive the probe connecting base 34 to move closer to or away from the projection center. The fixed base 31 is fixed to the top of the rotating ring 23 and rotates together with the rotating ring 23; two sets of lower radial sliding guide rails 32 are fixedly fixed at a mid-distance interval on the top of the fixed base 31. The bottom of the probe connector 34 is provided with two sets of upper radial sliding guide rails 33. The two sets of upper radial sliding guide rails 33 and lower radial sliding guide rails 32 are slidably connected to form a precision slide. The radial lead screw 36 is mounted on the fixed base 31 through the radial lead screw box 35, and its arrangement direction points to the center of the projection circle. The radial lead screw nut 37 cooperates with the radial lead screw 36. The side of the radial lead screw nut 37 is fixed to the probe connector 34. When the radial drive motor 38 drives the radial lead screw 36 to rotate, the radial lead screw nut 37 drives the probe connector 34 to move linearly along the guide rail, realizing radial movement closer to or away from the workpiece to be tested. This mechanism is compactly designed and directly mounted on the rotating component, so that the probe can contact the weld surface at a precisely set position and speed, and smoothly withdraw after the test is completed.

[0032] Through the above technical solution, the detection device is equipped with a sliding support mechanism, a rotating ring drive mechanism, a radial drive mechanism, and a probe mechanism working together. The sliding support mechanism can be raised and lowered to fit around the product under test, providing vertical positioning and support. The rotating ring drive mechanism is installed on top of the sliding support mechanism, driving the rotating ring to move in a circumferential direction. The radial drive mechanism is fixed on the rotating ring, driving the probe connecting seat and probe mechanism on it to perform radial feed and retraction movements. Through precise driving of three degrees of freedom—lifting, rotation, and radial—it is ensured that the probe can reach and cover the complex spatial position of the weld, meeting the requirements of the confined space in nuclear power plant sites. It has high integration and flexible movement, significantly improving the accuracy, reliability, and efficiency of automated detection. The probe mechanism uses a bottom-hinged elastic swing plate, a spring shaft, an adjusting spring, and a top flexible thin-film pressure sensor and thin-film array eddy current. The probe's composite structure enables quantitative calibration of pre-tightening force before testing, real-time acquisition of pressure distribution data across the entire contact surface throughout the testing stroke, and online monitoring of the contact state. This avoids testing deviations caused by abnormal contact pressure. Simultaneously, during the full circumferential testing process, it adapts in real-time to the contour changes of complex curved weld surfaces with varying curvatures, ensuring that the thin-film array eddy current probe and the surface of the weld under test maintain a tight, gapless contact. This eliminates coupling gap errors at the source and effectively suppresses the eddy current detection lift-off effect, completely solving the core technical problems of signal distortion, missed defects, and false detections caused by poor contact in curved weld surface testing. The device features a compact overall structure, stable operation, and strong adaptability to various working conditions. It can be directly integrated into various automated circumferential scanning continuous testing operations without requiring customized tooling for welds with different curvatures and specifications, significantly reducing testing costs and improving operational efficiency.

[0033] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all fall within the protection scope of the present invention. Furthermore, it should be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0034] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A detection device for probe contact pressure pickup in saddle-shaped J-welds, characterized in that, The detection device includes: A sliding support mechanism is disposed below the workpiece to be measured. The sliding support mechanism includes an inner support assembly and an outer sliding arm assembly. The outer sliding arm assembly is vertically sleeved and slidably connected to the outside of the inner support assembly. A rotating ring drive mechanism is provided, wherein a fixed ring at the bottom of the rotating ring drive mechanism is fixedly disposed above the outer sliding arm assembly, and a rotating ring at the top of the rotating ring drive mechanism is provided to be rotatably connected to the fixed ring, and the rotating ring drive mechanism drives the rotating ring to rotate. A radial drive mechanism is provided, wherein a fixed base at the bottom of the radial drive mechanism is fixedly disposed on the top of the rotating ring, and a probe connecting seat is provided on the top of the radial drive mechanism and slidably connected to the fixed base. The radial drive mechanism drives the probe connecting seat to move closer to or further away from the center of the rotating ring and project it onto the center of the projection circle of the plane in which the radial drive mechanism is located. A probe mechanism, located on top of the probe connector, rotates to fit the saddle-shaped J-weld for omnidirectional pressure testing when the outer sliding arm assembly and the rotating ring drive mechanism rise and are sleeved around the workpiece to be tested. The probe mechanism includes: The probe bracket has its bottom fixedly connected to the probe connector, and a circular groove is provided in the middle of the probe bracket, with the top of the probe bracket offset towards the center of the rotating ring. An elastic swing plate, which is rotatably hinged to the top of the probe bracket; A spring shaft, with its two ends respectively located in the circular groove and on the side of the elastic swing plate near the probe bracket, and the diameter of the spring shaft being smaller than the diameter of the circular groove; An adjusting spring, wherein the adjusting spring is sleeved on the central shaft of the spring; A flexible thin-film pressure sensor, wherein the non-detection end face of the flexible thin-film pressure sensor is bonded to the other side of the elastic swing plate; A thin-film array eddy current probe, wherein the non-detection end face of the thin-film array eddy current probe is bonded to the detection end face of the flexible thin-film pressure sensor, and the detection end face of the thin-film array eddy current probe is used to fit and detect saddle-shaped J-welds.

2. The detection device according to claim 1, characterized in that, The sliding support mechanism includes: An inner support assembly, wherein vertical sliding guide rails are respectively provided on both sides of the inner support assembly; A vertical drive assembly is vertically disposed at one end of the inner support assembly, and the vertical drive assembly is provided with a vertical lead screw parallel to the inner support assembly. An outer sliding arm assembly is sleeved outside the inner support assembly and outside the vertical drive assembly. The bottom and middle of both sides of the inner wall of the outer sliding arm assembly are provided with fixed assembly blocks that are slidably connected to the vertical sliding guide rail. A vertical lead screw nut connected to the vertical lead screw is provided at the bottom of one end of the inner wall of the outer sliding arm assembly, which is used by the vertical drive assembly to drive the vertical lead screw to move the outer sliding arm assembly up and down along the vertical sliding guide rail.

3. The detection device according to claim 2, characterized in that, The internal support component includes: Support base; The support cylinder is sleeved and fixedly mounted on the support base; The inner lining of the cylinder is fitted onto the top of the inner wall of the supporting cylinder; Four sets of vertical sliding guide rails are provided on each side of the outer wall of the support cylinder, with two sets of parallel vertical sliding guide rails on each side.

4. The detection device according to claim 2, characterized in that, The vertical drive component includes: A vertical drive motor is located at the bottom of one end of the inner support assembly; A coupling, one end of which is connected to the output shaft of the vertical drive motor; A vertical lead screw, one end of which is connected to the other end of the coupling for transmission. A lead screw holder is disposed on the top of one end of the inner support assembly, and the lead screw holder is drively connected to the other end of the vertical lead screw.

5. The detection device according to claim 3, characterized in that, The outer sliding arm assembly includes: The outer sliding arm cylinder is sleeved on the outside of the inner support assembly; A vertical lead screw nut is fixedly installed at the bottom of one side of the inner wall of the outer sliding arm cylinder opposite to the vertical drive assembly, and is connected to the vertical lead screw for transmission. Four sets of fixed assembly blocks are respectively fixedly installed on the bottom and middle of both sides of the inner wall of the outer sliding arm cylinder, and are used to slide and connect the vertical sliding guide rail.

6. The detection device according to claim 5, characterized in that, The outer sliding arm cylinder includes: Two sets of sliding arm grooves, with the front faces of the two sets of sliding arm grooves arranged vertically and parallel to each other; Four sets of sliding arm connecting plates are fixedly connected at both ends to the top and bottom of the two sets of sliding arm grooves, forming a hollow outer sliding arm cylinder.

7. The detection device according to claim 5, characterized in that, The fixed assembly block includes: A sliding connecting frame, one end of which is fixedly disposed on the inner wall of the outer sliding arm cylinder; Two sets of sliders, one end of each set of sliders is fixedly mounted parallel to the other end of the sliding connecting frame, and the other ends of each set of sliders are slidably connected to two sets of vertical sliding guide rails that are parallel to each other on the same side of the supporting cylinder.

8. The detection device according to claim 1, characterized in that, The rotating ring drive mechanism includes: Two turntable connecting blocks are respectively disposed on both sides of the top of the outer sliding arm assembly; A retaining ring is disposed at the top of the two turntable connecting blocks; A rotating ring is positioned above the fixed ring, and the centers of the rotating ring and the fixed ring coincide. A large gear ring is sleeved around the rotating ring, and the centers of the large gear ring and the rotating ring coincide. A limiting ring is disposed between the rotating ring and the fixed ring to limit the rotation ring along its axis; A drive gear is located on one side of the large gear ring and meshes with the large gear ring for transmission. A gear cover is disposed above the drive gear and is fixedly connected to one side of the retaining ring; A rotary drive motor is located below the drive gear and is connected to the drive gear in a transmission manner.

9. The detection device according to claim 1, characterized in that, The radial drive mechanism includes: A fixing seat is fixedly disposed on the top of the rotating ring; Two sets of lower radial sliding guide rails are fixedly connected at intervals to the middle of the top of the fixed base; Two sets of upper radial sliding guide rails, the bottom of the two sets of upper radial sliding guide rails respectively corresponding to the top of the two sets of lower radial sliding guide rails; The probe connector is fixedly connected to the top of the two sets of upper radial sliding guide rails on both sides of its bottom. A radial lead screw box is disposed on one side of the top of the fixed base; A radial lead screw, wherein the radial lead screw is disposed within the radial lead screw box, and the arrangement direction of the radial lead screw points towards the center of the projected circle; A radial lead screw nut, wherein the radial lead screw nut is drivingly connected to the radial lead screw and one side of the radial lead screw nut is fixedly connected to one side of the probe connecting seat; A radial drive motor is connected to the end of the radial lead screw away from the projection center, and is used to drive the probe connector to move closer to or away from the projection center.

Images