An oil-immersed reactor sleeve lower porcelain sleeve phased array ultrasonic detection positioning mechanism

Abstract

The utility model discloses a kind of oil-immersed reactor bushing lower porcelain sleeve phased array ultrasonic detection positioning mechanism, including workbench, the top of both sides of workbench is fixedly connected with support plate;Positioning member, positioning member is positioned to lower porcelain sleeve, positioning member is installed between two groups of support plate;Mounting frame, mounting frame is installed in one side of two groups of support plate, the below of mounting frame is provided with L-shaped plate, the below end surface of L-shaped plate is connected with the detection member for phased array ultrasonic detection to lower porcelain sleeve by sliding connector;Displacement member, displacement member is installed in one side of mounting frame, the utility model is positioned by the cooperation of positioning member and detection member and displacement member, two groups of relative positioning cap, the clamping action of cooperation pusher and the rotation drive of rotating member, both can realize reliable fixation of lower porcelain sleeve, can also drive lower porcelain sleeve rotation, thus avoid the error of manual positioning and rotation operation, also save the time of manual adjustment adaptation different size workpiece, substantially improve batch detection efficiency.

Description

Technical Field

[0001] This utility model relates to the field of positioning mechanism technology, specifically to an ultrasonic testing and positioning mechanism for the ceramic sleeve under the bushing of an oil-immersed reactor. Background Technology

[0002] Transformer bushings are crucial components connecting the internal winding leads of a transformer to the external overhead lines, serving a dual function of mechanical connection and electrical insulation. Oil-paper capacitor bushings are currently the most widely used type of bushing. The lower porcelain bushing, made of high-strength ceramic, is one of the important external insulation structures. It has a large-diameter end on one side and a small-diameter end on the other, including a large-diameter constant-diameter section and a gradually decreasing-diameter variable-diameter section.

[0003] Currently, Chinese patent CN220271237U discloses a phased array ultrasonic probe for a post-supported porcelain insulator. The probe includes a frame comprising overlapping horizontal and vertical bars. Connecting bolts pass through a first adjustment slot on the horizontal bar and a second adjustment slot on the vertical bar, and are threaded onto nuts. One end of the horizontal bar is fixedly connected to an integrally formed half-sleeve plate on a mounting base. Connecting half-sleeves are inserted into plug-in lugs on both sides of the half-sleeve plate. The phased array ultrasonic probe body is fixedly connected to a mounting platform at the upper end of the vertical bar. This utility model provides a frame for installing a phased array ultrasonic probe. During use, the position of the vertical bar can be adjusted by sliding the horizontal bar to achieve the adjustment of the entire frame size, adapting to the needs of different sized post-supported porcelain insulators. Disassembly, assembly, and adjustment are simple and convenient, making it easy to use.

[0004] The above-mentioned problems exist in actual use. The adjustment process relies on manual operation and cannot be linked with the phased array ultrasonic testing system to achieve automated positioning. For large-scale or batch testing scenarios, the efficiency is low, and manual adjustment is prone to introducing operational errors. Utility Model Content

[0005] The purpose of this invention is to provide an ultrasonic testing and positioning mechanism for the ceramic bushing under the bushing of an oil-immersed reactor, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A phased array ultrasonic testing and positioning mechanism for the lower porcelain bushing of an oil-immersed reactor includes a worktable with support plates fixedly connected to the top of both sides; a positioning element for positioning the lower porcelain bushing, which is installed between the two sets of support plates; a mounting frame installed on one side of the two sets of support plates, with an L-shaped plate below the mounting frame, one end of which extends to the other side, and a testing element for phased array ultrasonic testing of the lower porcelain bushing connected to the lower end surface of the L-shaped plate via a sliding connector; and a displacement element installed on one side of the mounting frame for moving the L-shaped plate along the length of the mounting frame to achieve testing operations on different axial regions of the lower porcelain bushing.

[0008] As a preferred technical solution, the positioning component includes two sets of positioning caps disposed between two sets of support plates. The openings of the two sets of positioning caps are arranged opposite to each other. One set of support plates has a rotating component on the upper outer side for rotating the corresponding side positioning cap, and the other set of support plates has a pushing component on the upper outer side for pushing the corresponding side positioning cap inward to fix the lower ceramic sleeve with the cooperation of the other set of positioning caps.

[0009] The other set of positioning caps, under the push of the pusher, cooperate with the positioning caps on the rotating side to fix the lower porcelain sleeve. The rotating part drives the positioning caps to rotate the lower porcelain sleeve, and cooperates with the displacement part to achieve comprehensive detection of the circumference and axial direction of the lower porcelain sleeve.

[0010] As a preferred technical solution, the rotating component includes a first servo motor fixedly installed on the outer side of the upper part of one of the support plates. The output shaft of the first servo motor rotates through the corresponding side support plate and is fixedly connected to the end of the corresponding side positioning cap.

[0011] As a preferred technical solution, the pushing member includes an electric push rod fixedly installed on the upper outer side of another set of support plates, the telescopic end of the electric push rod passing through the corresponding side support plate and fixedly connected to the end of the corresponding side positioning cap.

[0012] As a preferred technical solution, the sliding connector includes two sets of sliding rings that are slidably sleeved on the lower end surface of the L-shaped plate, and a mounting plate is fixedly installed on the top of each set of sliding rings.

[0013] As a preferred technical solution, the testing device includes a set of ultrasonic probes on the inner side of the upper part of the mounting plate, and the ultrasonic probes are electrically connected to the phased array ultrasonic instrument through wires.

[0014] As a preferred technical solution, the displacement component includes a rectangular hole opened at the top of the mounting frame. The rectangular hole is set along the length of the mounting frame. A one-way lead screw is rotatably connected to the inner cavity of the rectangular hole. A nut seat is threadedly connected to the surface of the one-way lead screw. The bottom of the nut seat is fixedly connected to the top of the L-shaped plate. A second servo motor is fixedly installed on one side of the mounting frame. The output shaft of the second servo motor passes through the mounting frame and is keyed to the end of the one-way lead screw.

[0015] As a preferred technical solution, the bottom of the L-shaped plate is provided with a rectangular groove along its length. A bidirectional lead screw is rotatably connected to the inner cavity of the rectangular groove. Nut seats are threaded to both ends of the bidirectional lead screw. Connecting bolts are provided at the bottom of both sets of sliding rings. The ends of the two sets of connecting bolts pass through the bottom of the corresponding side sliding rings and are threaded to the bottom surface of the corresponding side nut seats. A third servo motor is fixedly installed on one bottom side of the L-shaped plate. The output shaft of the third servo motor extends into the rectangular groove and is keyed to the end of the bidirectional lead screw.

[0016] As a preferred technical solution, a laser rangefinder is fixedly installed on the upper inner side of another set of mounting plates. The laser rangefinder is used to measure the distance to the lower ceramic sleeve surface. A controller is fixedly installed on the outer side of one set of support plates. The signal output terminal of the laser rangefinder is electrically connected to the signal input terminal of the controller through a wire. The third servo motor is controlled by the controller. The second servo motor, the first servo motor, and the electric push rod are all controlled by the controller.

[0017] The laser rangefinder is used to detect the distance between itself and the surface of the lower ceramic sleeve in real time and generate a distance signal. After receiving the distance signal, the controller controls the third servo motor to start according to the preset detection distance threshold, drives the bidirectional lead screw to rotate, and then drives the mounting plate and ultrasonic probe to move along the length of the L-shaped plate through the nut seat and sliding ring, so as to realize the automatic adjustment of the distance between the ultrasonic probe and the surface of the lower ceramic sleeve, so as to ensure that the distance between the probe and the workpiece surface is always within the preset range during the detection process.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. This utility model, through the cooperation of positioning components, detection components, and displacement components, and two sets of opposing positioning caps, combined with the clamping action of the pushing component and the rotation drive of the rotating component, can not only reliably fix the lower porcelain sleeve, but also drive the lower porcelain sleeve to rotate. Therefore, it avoids the errors of manual positioning and rotation operations, and saves the time of manually adjusting to adapt to workpieces of different sizes, greatly improving the efficiency of batch inspection. At the same time, combined with the axial movement function of the displacement component, the detection component can simultaneously cover the circumferential direction and axial direction of the lower porcelain sleeve, effectively avoiding blind spots in inspection and ensuring the comprehensiveness of the inspection of the lower porcelain sleeve.

[0020] 2. By setting up a displacement component, the second servo motor drives the unidirectional lead screw to rotate, which in turn moves the nut seat and L-shaped plate along the length of the mounting frame. Combined with the precise control of the servo motor and the stable transmission of the unidirectional lead screw, the L-shaped plate and the detection component can move smoothly and accurately along the axial direction of the lower porcelain sleeve, ensuring that the detection component can accurately cover every area to be detected along the axial direction of the lower porcelain sleeve, thereby improving the accuracy and coverage integrity of the axial detection.

[0021] 3. This utility model, through the setting of a controller and a laser rangefinder, allows the laser rangefinder to collect the distance signal between the ultrasonic probe and the surface of the lower ceramic sleeve in real time. Combined with the centralized control of the controller over the third servo motor, the second servo motor, the first servo motor, and the electric push rod, the distance between the ultrasonic probe and the surface of the lower ceramic sleeve can be automatically adjusted. This ensures that the distance always meets the preset requirements during the testing process, avoiding the impact of distance deviation on the testing accuracy. Furthermore, through the centralized management of the controller, positioning, rotation, axial movement, and distance adjustment are coordinated, greatly improving the automation level of the testing operation, reducing manual intervention, and ensuring the continuity and stability of the entire testing process. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the phased array ultrasonic testing and positioning mechanism for the lower ceramic bushing of an oil-immersed reactor according to this utility model.

[0023] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0024] Figure 3 This is a schematic diagram of the mounting frame of this utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the bidirectional lead screw of this utility model.

[0026] In the picture:

[0027] 100. Workbench; 101. Support plate;

[0028] 200. First servo motor; 201. Positioning cap; 202. Electric push rod; 203. Pressure sensor; 204. Controller;

[0029] 300. Mounting frame; 301. Rectangular hole; 302. Nut holder; 303. L-shaped plate; 304. Second servo motor; 305. Third servo motor; 306. Sliding ring; 307. Ultrasonic probe; 308. Mounting plate; 309. Laser rangefinder; 310. Nut holder; 311. Connecting bolt; 312. Bidirectional lead screw; 313. Rectangular groove; 314. Unidirectional lead screw. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Please see Figure 1-4 This embodiment provides a phased array ultrasonic testing and positioning mechanism for the lower porcelain bushing of an oil-immersed reactor, including a worktable 100, with support plates 101 fixedly connected to the top of both sides of the worktable 100; a positioning element for positioning the lower porcelain bushing, which is installed between the two sets of support plates 101; a mounting frame 300 installed on one side of the two sets of support plates 101, with an L-shaped plate 303 provided below the mounting frame 300, one end of the L-shaped plate 303 extending to the other side, and a testing element for performing phased array ultrasonic testing on the lower porcelain bushing connected to the lower end surface of the L-shaped plate 303 via a sliding connector; and a displacement element installed on one side of the mounting frame 300, which is used to move the L-shaped plate 303 along the length of the mounting frame 300 to achieve testing operations on different axial areas of the lower porcelain bushing.

[0032] The positioning component includes two sets of positioning caps 201 disposed between the two sets of support plates 101. The openings of the two sets of positioning caps 201 are arranged opposite each other. One set of support plates 101 has a rotating component on the upper outer side for rotating the corresponding side positioning cap 201. The other set of support plates 101 has a pushing component on the upper outer side for pushing the corresponding side positioning cap 201 inward, thereby fixing the lower ceramic sleeve with the cooperation of the other set of positioning caps 201.

[0033] Another set of positioning caps 201, pushed by the pusher, cooperates with the positioning caps 201 on the rotating side to fix the lower porcelain sleeve. The rotating component drives the positioning caps 201 to rotate the lower porcelain sleeve. With the help of the displacement component, the lower porcelain sleeve can be fully inspected in both the circumference and axial direction. Through the cooperation of the positioning component, the detection component, and the displacement component, the two sets of positioning caps 201, which are set opposite to each other, can not only reliably fix the lower porcelain sleeve, but also drive the lower porcelain sleeve to rotate. Therefore, the errors of manual positioning and rotation operation are avoided, and the time of manual adjustment to adapt to workpieces of different sizes is saved, which greatly improves the efficiency of batch inspection. At the same time, combined with the axial movement function of the displacement component, the detection component can cover the circumference and axial direction of the lower porcelain sleeve at the same time, effectively avoiding blind spots in the inspection and ensuring the comprehensiveness of the inspection of the lower porcelain sleeve.

[0034] The positioning groove 201 is made of 45 steel. A 3-5mm thick fluororubber buffer layer is bonded to the inner wall surface that contacts the lower ceramic sleeve. This not only prevents the high-strength ceramic lower ceramic sleeve from being scratched when clamped, but also increases the friction through the elastic deformation of the rubber to prevent the lower ceramic sleeve from slipping when rotating.

[0035] The rotating component includes a first servo motor 200 fixedly installed on the outer side of the upper part of one of the support plates 101. The output shaft of the first servo motor 200 rotates through the corresponding side support plate 101 and is fixedly connected to the end of the corresponding side positioning cap 201. By setting the rotating component, the high control precision and stable output of the servo motor can accurately drive the positioning cap 201 and the fixed lower ceramic sleeve to rotate, ensuring that the rotation speed of the lower ceramic sleeve is uniform and the rotation angle is controllable. This avoids the deviation of the relative position between the detection component and the workpiece due to unstable rotation, thereby improving the stability of the detection process and the accuracy of the detection results.

[0036] The pushing component includes an electric push rod 202 fixedly installed on the upper outer side of another set of support plates 101. The telescopic end of the electric push rod 202 passes through the corresponding side support plate 101 and is fixedly connected to the end of the corresponding side positioning cap 201. Through the setting of the pushing component, the electric push rod 202 can provide a stable and controllable thrust, which can drive the positioning cap 201 to move smoothly inward. It cooperates with the positioning cap 201 on the other side to clamp and fix the lower porcelain sleeve. Moreover, its thrust output is stable, which can ensure that the lower porcelain sleeve remains fixed in the whole inspection process without loosening or displacement, thus providing a guarantee for the stable operation of the inspection.

[0037] One of the positioning caps 201 has a pressure sensor 203 fixedly installed on its back. The signal output end of the pressure sensor 203 is electrically connected to the signal input end of the controller 204 through a wire. The detection end of the pressure sensor 203 extends into the corresponding side of the positioning cap 201. The detection end of the pressure sensor 203 extends into the positioning cap 201, which can collect the pressure signal when the positioning cap 201 contacts the lower ceramic sleeve in real time and transmit the signal to the controller 204. The controller 204 automatically adjusts the extension and retraction of the electric push rod 202 according to the preset clamping force threshold to ensure that the lower ceramic sleeve does not loosen and to avoid excessive pressure. When the pressure reaches the threshold, the electric push rod 202 stops pushing to prevent the lower ceramic sleeve from cracking or the positioning cap 201 from deforming due to excessive clamping. If the pressure is lower than the threshold, the controller 204 drives the electric push rod 202 to continue to advance to prevent the lower ceramic sleeve from slipping and shifting during rotation detection.

[0038] The pressure sensor 203 can be selected from one of the following: Honeywell 31 miniature force sensor, JIEINT 1210 low-pressure sensor, or Endershaus Ceracore USC70.

[0039] The sliding connector includes two sets of sliding rings 306 that are slidably sleeved on the lower end surface of the L-shaped plate 303. The top of each set of sliding rings 306 is fixedly mounted with a mounting plate 308. Through the setting of the sliding connector, the sliding rings 306 can slide smoothly along the lower end of the L-shaped plate 303, providing stable sliding support for the position adjustment of the mounting plate 308 and subsequent components, ensuring that subsequent spacing adjustment and other operations can be carried out flexibly and smoothly, and avoiding the impact of sliding jamming on adjustment efficiency.

[0040] The testing component includes an ultrasonic probe 307 mounted on the inner side of the upper part of a mounting plate 308. The ultrasonic probe 307 is electrically connected to the phased array ultrasonic instrument via a wire. By setting the ultrasonic probe 307, it can directly form a testing association with the surface of the lower ceramic sleeve and transmit the signals collected during the testing process to the phased array ultrasonic instrument in real time. The phased array ultrasonic technology enables accurate detection of internal defects in the lower ceramic sleeve, providing reliable testing data support for judging the quality of the lower ceramic sleeve and ensuring the validity of the testing results.

[0041] The ultrasonic probe 307 is a well-known technical means in the art. For its specific working principle and structure, please refer to the phased array ultrasonic probe body in a phased array ultrasonic probe for a support porcelain insulator with publication number CN220271237U. Other details will not be elaborated here.

[0042] The phased array ultrasound instrument can be either the Olympus OmniScan X364 or the Shantou Ultrasonic CTS-2108PAGEPhasor XS. The specific choice is not limited here.

[0043] The process of how the ultrasonic probe 307 inspects the lower ceramic sleeve is as follows;

[0044] The ultrasonic probe 307 is installed inside the mounting plate 308 below the L-shaped plate. Before the test, the laser rangefinder 309 on another set of mounting plates 308 detects the distance between it and the surface of the lower ceramic sleeve in real time and transmits the signal to the controller 204. The controller 204 compares the preset detection distance threshold. If it does not meet the requirements, it immediately drives the third servo motor 305 to drive the bidirectional lead screw 312 to rotate. Through the nut seat 310 and the sliding ring 306, it pushes the mounting plate 308 and the ultrasonic probe 307 to move along the length of the L-shaped plate until the distance between the probe and the surface of the lower ceramic sleeve is stable within the preset range. This ensures that the ultrasonic propagation path is stable and avoids signal attenuation or distortion caused by the distance deviation.

[0045] The ultrasonic probe 307 is electrically connected to the phased array ultrasonic instrument via a wire. The phased array ultrasonic instrument enters the test state. At the same time, the controller 204, the linkage positioning component electric push rod 202 has clamped the lower ceramic sleeve, the second servo motor 304 is ready to start, and the first servo motor 200 is ready to start, ensuring that each component works together according to the preset logic.

[0046] Subsequently, the phased array ultrasonic instrument outputs an excitation signal to the ultrasonic probe 307. Multiple array elements inside the probe synchronously generate high-frequency ultrasonic waves under excitation, typically at the MHz level, which are suitable for the defect detection requirements of non-metallic materials in ceramic sleeves. Through the precise control of the emission timing of each array element by phased array technology, ultrasonic waves can be focused into a sound beam at a specific angle and incident vertically or at a preset angle onto the surface of the lower ceramic sleeve.

[0047] The incident ultrasonic wave propagates along the interior of the lower ceramic sleeve, and changes occur during propagation due to differences in the density and elastic modulus of the ceramic sleeve material.

[0048] If there are no defects inside the ceramic sleeve, most of the ultrasonic energy will propagate along the preset path to the other side of the ceramic sleeve, or be reflected by the bottom surface to form a bottom wave.

[0049] If there are defects inside the ceramic sleeve, the difference in acoustic properties between the defects and the surrounding materials will cause ultrasonic waves to be reflected, refracted or scattered, forming defect waves. The propagation path of the defect waves is different from that of the bottom waves, and the signal intensity and phase will change with the size and depth of the defects.

[0050] After the ultrasonic probe 307 completes transmission, the array element switches to receiving mode to capture the bottom wave and defect wave reflected from inside the ceramic sleeve in real time. The probe converts the received mechanical vibration ultrasonic echo into a weak electrical signal, which is then transmitted to the phased array ultrasonic instrument through a wire.

[0051] Furthermore, the controller 204 starts the first servo motor 200, which drives the positioning cap 201 and the clamped lower ceramic sleeve to rotate at a constant speed. The rotation speed is preset by the controller 204 to ensure that the probe has enough time to collect the echo signal of each revolution. During the rotation of the lower ceramic sleeve, the ultrasonic probe 307 is always aligned with a certain axial position on the surface of the ceramic sleeve, continuously emitting and receiving ultrasonic waves to achieve full coverage detection of the lower ceramic sleeve at that axial position, avoiding detection blind spots in the circumferential direction.

[0052] Once a certain circumferential position is detected, the controller 204 starts the second servo motor 304, which drives the one-way lead screw 314 at the top of the mounting frame 300 to rotate. This causes the nut seat 302, the L-shaped plate, and the ultrasonic probe 307 to move slowly along the lower ceramic sleeve axis. After moving to the next axial detection position, the displacement component pauses, while the positioning component continues to drive the lower ceramic sleeve to rotate. The probe repeats the circumferential scan. This cycle continues until the probe completes the detection of all preset areas along the lower ceramic sleeve axis, forming a spiral full-area scanning path.

[0053] At this point, the phased array ultrasonic instrument amplifies, filters, and reduces noise on the received weak electrical signal to remove environmental interference signals, such as mechanical vibration and electromagnetic interference. Then, through phased array imaging algorithms, such as B-scan and C-scan, the processed signal is converted into a visual image. The image can clearly show the cross-sectional or longitudinal structure of the lower ceramic sleeve. The bottom wave is shown as a continuous and stable signal line, and the defect wave is shown as an abnormal signal peak or discontinuity. The depth, size, location and other parameters of the defect can be calculated through the algorithm.

[0054] The phased array ultrasonic instrument automatically records image data and defect parameters of all scanned areas, and can display the test results in real time and generate test reports;

[0055] Operators use preset defect judgment criteria, such as defect size threshold and depth threshold, combined with image data to determine whether the ceramic bushing is qualified. If there are defects exceeding the standard, the specific location of the defect can be located through the image, providing a basis for subsequent repair or scrapping.

[0056] The displacement component includes a rectangular hole 301 formed at the top of the mounting frame 300. The rectangular hole 301 is set along the length of the mounting frame 300. A one-way lead screw 314 is rotatably connected to the inner cavity of the rectangular hole 301. A nut seat 302 is threadedly connected to the surface of the one-way lead screw 314. The bottom of the nut seat 302 is fixedly connected to the top of the L-shaped plate 303. A second servo motor 304 is fixedly mounted on one side of the mounting frame 300. The output shaft of the second servo motor 304 passes through the mounting frame 300 and is connected to the one-way lead screw 302. The ends of 14 are connected together. Through the setting of the displacement component, the second servo motor 304 drives the one-way screw 314 to rotate, which drives the nut seat 302 and the L-shaped plate 303 to move along the length direction of the mounting frame 300. Combined with the precise control of the servo motor and the stable transmission of the one-way screw 314, the L-shaped plate 303 and the detection component can move smoothly and accurately along the axis of the lower porcelain sleeve, ensuring that the detection component can accurately cover every area to be detected along the axis of the lower porcelain sleeve, thereby improving the accuracy and coverage integrity of the axial detection.

[0057] The L-shaped plate 303 has a rectangular groove 313 extending along its length at its bottom. A bidirectional lead screw 312 is rotatably connected to the inner cavity of the rectangular groove 313. Nut seats 310 are threaded to both ends of the bidirectional lead screw 312. Connecting bolts 311 are provided at the bottom of both sets of sliding rings 306. The ends of the two sets of connecting bolts 311 pass through the bottom of the corresponding sliding rings 306 and are threaded to the bottom surface of the corresponding nut seats 310. A third servo motor 305 is fixedly installed on one side of the bottom of the L-shaped plate 303. The output shaft of the third servo motor 305 extends into the rectangular groove 313 and is keyed to the end of the bidirectional lead screw 312. Through the setting of the third servo motor 305, the third servo motor 305 drives the bidirectional lead screw 312 to rotate, causing the nut seats 310 and sliding rings 306 to move along the length of the L-shaped plate 303, thereby realizing the precise adjustment of the position of the sliding rings 306 and the mounting plate 308, ensuring that the spacing adjustment can be completed quickly and accurately.

[0058] Among them, a laser rangefinder 309 is fixedly installed on the upper inner side of another set of mounting plates 308. The laser rangefinder 309 is used to measure the distance with the lower ceramic sleeve surface. A controller 204 is fixedly installed on the outer side of one set of support plates 101. The signal output terminal of the laser rangefinder 309 is electrically connected to the signal input terminal of the controller 204 through a wire. The third servo motor 305 is controlled by the controller 204. The second servo motor 304, the first servo motor 200, and the electric push rod 202 are controlled by the controller 204.

[0059] The laser rangefinder 309 is used to detect the distance between itself and the surface of the lower ceramic sleeve in real time and generate a distance signal. After receiving the distance signal, the controller 204 controls the third servo motor 305 to start according to the preset detection distance threshold, driving the bidirectional lead screw 312 to rotate. This, in turn, drives the mounting plate 308 and the ultrasonic probe 307 to move along the length of the L-shaped plate 303 through the nut seat 310 and the sliding ring 306, thereby realizing the automatic adjustment of the distance between the ultrasonic probe 307 and the surface of the lower ceramic sleeve. This ensures that the distance between the probe and the workpiece surface is always within the preset range during the detection process. Through the settings of the controller 204 and the laser rangefinder 309, the laser rangefinder 309... 9. The distance signal between the ultrasonic probe 307 and the surface of the lower ceramic sleeve is collected in real time. Combined with the centralized control of the third servo motor 305, the second servo motor 304, the first servo motor 200 and the electric push rod 202 by the controller 204, the distance between the ultrasonic probe 307 and the surface of the lower ceramic sleeve can be automatically adjusted. This ensures that the distance always meets the preset requirements during the detection process, avoiding the impact of distance deviation on detection accuracy. Furthermore, through the centralized management of the controller 204, positioning, rotation, axial movement and distance adjustment are coordinated, which greatly improves the automation level of the detection operation, reduces manual intervention, and ensures the continuity and stability of the entire detection process.

[0060] Among them, the controller 204 can be a DSP controller 204, specifically the TMS320F2812, and the laser rangefinder 309 can be one of SICK OD200, MTI L2, INSIGHT-60, etc.

[0061] Working principle;

[0062] The lower ceramic sleeve to be tested is placed on the positioning cap 201 between the two sets of support plates 101, with the openings of the two sets of positioning caps 201 facing each other. The controller 204 controls the electric push rod 202 to start. The telescopic end of the electric push rod 202 pushes the positioning cap 201 on the corresponding side to move inward, cooperating with the positioning cap 201 on the other side of the support plate 101 to clamp and fix the lower ceramic sleeve, ensuring that the position of the lower ceramic sleeve is stable during the testing process.

[0063] Subsequently, the staff sprayed coupling agent onto the surface of the lower ceramic sleeve and ensured that the coupling agent could fully wet the lower ceramic sleeve;

[0064] After positioning is completed, the laser rangefinder 309 installed on one of the mounting plates 308 starts to work, detects the distance between itself and the surface of the lower ceramic sleeve in real time and generates a distance signal. This signal is transmitted to the controller 204 through a wire. After receiving the distance signal, the controller 204 compares it with the preset detection distance threshold. If the distance does not meet the preset requirements.

[0065] At this time, the controller 204 controls the third servo motor 305 to start. The output shaft of the third servo motor 305 drives the bidirectional lead screw 312 in the rectangular slot 313 to rotate. The nut seats 310 at both ends of the bidirectional lead screw 312 move axially with the rotation of the lead screw. The nut seats 310 drive the corresponding sliding ring 306 to slide along the lower end of the L-shaped plate 303 through the connecting bolt 311. The sliding ring 306 then drives the mounting plate 308 and the ultrasonic probe 307 on the mounting plate 308 to move along the length of the L-shaped plate 303 until the distance between the ultrasonic probe 307 and the surface of the lower ceramic sleeve reaches the preset range. The third servo motor 305 then stops working.

[0066] After the first servo motor 200 starts, its output shaft drives the positioning cap 201 on the corresponding side to rotate. Since the lower ceramic sleeve has been clamped and fixed by the two sets of positioning caps 201, the positioning caps 201 drive the lower ceramic sleeve to rotate synchronously, so that the ultrasonic probe 307 can detect different positions in the circumferential direction of the lower ceramic sleeve.

[0067] When this area is inspected, the second servo motor 304 starts, and its output shaft drives the one-way screw 314 in the rectangular hole 301 at the top of the mounting frame 300 to rotate. The nut seat 302, which is threaded to the one-way screw 314, moves along the length of the screw. The nut seat 302 drives the L-shaped plate 303 to move synchronously. The ultrasonic probe 307 below the L-shaped plate 303 moves along the lower ceramic sleeve axis with the L-shaped plate 303, realizing the inspection operation of different areas of the lower ceramic sleeve in the axial direction.

[0068] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A phased array ultrasonic testing and positioning mechanism for the ceramic bushing under the bushing of an oil-immersed reactor, characterized in that, include: The workbench (100) has support plates (101) fixedly connected to the top of both sides. A positioning element, which is used to position the lower ceramic sleeve, is installed between two sets of support plates (101); Mounting frame (300), the mounting frame (300) is mounted on one side of two sets of support plates (101), an L-shaped plate (303) is provided below the mounting frame (300), one end of the L-shaped plate (303) extends to the other side, and the lower end surface of the L-shaped plate (303) is connected by a sliding connector to a test piece for performing phased array ultrasonic testing on the lower ceramic sleeve; The displacement component is installed on one side of the mounting frame (300). The displacement component is used to move the L-shaped plate (303) along the length of the mounting frame (300) to realize the detection operation of different areas of the lower porcelain sleeve in the axial direction.

2. The phased array ultrasonic testing and positioning mechanism for the ceramic bushing under the bushing of an oil-immersed reactor according to claim 1, characterized in that: The positioning component includes two sets of positioning caps (201) disposed between two sets of support plates (101). The openings of the two sets of positioning caps (201) are arranged opposite to each other. One set of support plates (101) has a rotating component on the upper outer side for rotating the corresponding side positioning cap (201), and the other set of support plates (101) has a pushing component on the upper outer side for pushing the corresponding side positioning cap (201) inward so as to fix the lower ceramic sleeve with the cooperation of the other set of positioning caps (201). The other set of positioning caps (201) is pushed by the pusher and, in cooperation with the positioning caps (201) on the rotating side, fixes the lower porcelain sleeve. The rotating part drives the positioning caps (201) to rotate the lower porcelain sleeve, and, in cooperation with the displacement part, achieves comprehensive detection of the circumference and axial direction of the lower porcelain sleeve.

3. The phased array ultrasonic testing and positioning mechanism for the ceramic bushing under the bushing of an oil-immersed reactor according to claim 2, characterized in that: The rotating component includes a first servo motor (200) fixedly installed on the upper outer side of one of the support plates (101). The output shaft of the first servo motor (200) rotates through the corresponding side support plate (101) and is fixedly connected to the end of the corresponding side positioning cap (201).

4. The phased array ultrasonic testing and positioning mechanism for the ceramic bushing under the bushing of an oil-immersed reactor according to claim 3, characterized in that: The pusher includes an electric push rod (202) fixedly installed on the upper outer side of another set of support plates (101). The telescopic end of the electric push rod (202) passes through the corresponding side support plate (101) and is fixedly connected to the end of the corresponding side positioning cap (201).

5. The phased array ultrasonic testing and positioning mechanism for the ceramic bushing under the bushing of an oil-immersed reactor according to claim 4, characterized in that: The sliding connector includes two sets of sliding rings (306) that are slidably sleeved on the lower end surface of the L-shaped plate (303), and the top of each set of sliding rings (306) is fixedly mounted with an mounting plate (308).

6. The phased array ultrasonic testing and positioning mechanism for the ceramic bushing under the bushing of an oil-immersed reactor according to claim 5, characterized in that: The testing component includes an ultrasonic probe (307) on the inner side of the upper part of one of the mounting plates (308), and the ultrasonic probe (307) is electrically connected to the phased array ultrasonic instrument via a wire.

7. The phased array ultrasonic testing and positioning mechanism for the ceramic bushing under the bushing of an oil-immersed reactor according to claim 6, characterized in that: The displacement component includes a rectangular hole (301) opened on the top of the mounting frame (300). The rectangular hole (301) is set along the length of the mounting frame (300). A one-way lead screw (314) is rotatably connected to the inner cavity of the rectangular hole (301). A nut seat (302) is threadedly connected to the surface of the one-way lead screw (314). The bottom of the nut seat (302) is fixedly connected to the top of the L-shaped plate (303). A second servo motor (304) is fixedly installed on one side of the mounting frame (300). The output shaft of the second servo motor (304) passes through the mounting frame (300) and is keyed to the end of the one-way lead screw (314).

8. The phased array ultrasonic testing and positioning mechanism for the ceramic bushing under the bushing of an oil-immersed reactor according to claim 7, characterized in that: The bottom of the L-shaped plate (303) is provided with a rectangular groove (313) along its length. The inner cavity of the rectangular groove (313) is rotatably connected to a two-way lead screw (312). The two ends of the two-way lead screw (312) are respectively threaded to nut seats (310). The bottom of the two sets of sliding rings (306) is provided with connecting bolts (311). The ends of the two sets of connecting bolts (311) pass through the bottom of the corresponding side sliding ring (306) and are threaded to the bottom surface of the corresponding side nut seat (310). A third servo motor (305) is fixedly installed on one side bottom of the L-shaped plate (303). The output shaft of the third servo motor (305) extends into the rectangular groove (313) and is keyed to the end of the two-way lead screw (312).

9. The phased array ultrasonic testing and positioning mechanism for the ceramic bushing under the bushing of an oil-immersed reactor according to claim 8, characterized in that: A laser rangefinder (309) is fixedly installed on the upper inner side of another set of mounting plates (308). The laser rangefinder (309) is used to measure the distance to the lower ceramic sleeve surface. A controller (204) is fixedly installed on the outer side of one set of support plates (101). The signal output terminal of the laser rangefinder (309) is electrically connected to the signal input terminal of the controller (204) through a wire. The third servo motor (305) is controlled by the controller (204). The second servo motor (304), the first servo motor (200), and the electric push rod (202) are controlled by the controller (204). The laser rangefinder (309) is used to detect the distance between itself and the lower ceramic sleeve surface in real time and generate a distance signal. After receiving the distance signal, the controller (204) controls the third servo motor (305) to start according to the preset detection distance threshold, drives the bidirectional lead screw (312) to rotate, and then drives the mounting plate (308) and ultrasonic probe (307) to move along the length direction of the L-shaped plate (303) through the nut seat (310) and sliding ring (306), so as to realize the automatic adjustment of the distance between the ultrasonic probe (307) and the lower ceramic sleeve surface, so as to ensure that the distance between the probe and the workpiece surface is always within the preset range during the detection process.

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