A control rod drive mechanism dissimilar metal weld inspection device

Abstract

The present application belongs to the technical field of nondestructive testing, and discloses a device for inspecting dissimilar metal welds of a control rod drive mechanism, which comprises a main body rotation module, a circumferential rotation driving module, a plurality of probe swing modules, a radial driving module, an inspection device positioning module, a sealing module and a circumferential rotation limiting module. The positioning column in the inspection device positioning module is extended into the main body rotation module, so that the effect of inspecting the middle omega weld of the control rod drive mechanism is achieved. Furthermore, the circumferential rotation of the probe is realized by the cooperation of the probe swing module, the main body rotation module and the circumferential rotation driving module, and the radial rotation of the probe is realized by the cooperation of the probe swing module and the radial driving module, so that the comprehensive inspection of the middle omega weld of the control rod drive mechanism is realized.

Description

Technical Field

[0001] This invention belongs to the field of nondestructive testing technology, and specifically relates to a device for inspecting dissimilar metal welds using a control rod drive mechanism. Background Technology

[0002] Currently, leaks have been repeatedly observed at the Ω-sealed welds of the control rod drive mechanism (CRDM) in many nuclear power plants both domestically and internationally that are in normal operation. Therefore, conducting safety inspections of the special thin-walled Ω-seales in this mechanism has become a critical challenge that urgently needs to be addressed in the fields of pre-service inspection (PSI) and in-service inspection (ISI) of nuclear power plants.

[0003] The Ω-shaped weld and its adjacent base metal exhibit typical thin-walled, compact structural characteristics, specifically a significantly reduced wall thickness and a small outer diameter. This unique structural feature places extremely stringent demands on non-destructive testing (NDT) techniques. Due to the limitations of its structural geometry, effective inspection of this weld requires radial scanning using an ultrasonic probe. Therefore, developing a highly adaptable, dedicated automated inspection device has become an urgent technical challenge.

[0004] Chinese patent publication CN118897015A discloses an inspection device for ultrasonic inspection of irregularly shaped welds. This structure utilizes a synchronous belt to connect the driven synchronous pulleys at the upper end of multiple probe swing mechanisms in series, enabling synchronous swinging of multiple ultrasonic probes. This achieves comprehensive coverage and continuous inspection of the irregularly shaped weld and the surrounding base material area. However, this device can only inspect the irregularly shaped metal welds below the control rod drive mechanism; its structural limitations prevent it from scanning the irregularly shaped metal welds in the middle of the control rod drive mechanism. Summary of the Invention

[0005] In view of the technical problems existing in the prior art, the purpose of the present invention is to provide a device for inspecting dissimilar metal welds using a control rod drive mechanism.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A control rod drive mechanism for inspecting dissimilar metal welds, comprising:

[0008] The main rotating module includes a hollow main rotating mechanism and a hollow main housing, wherein the main rotating mechanism is rotatably connected to the main housing;

[0009] A circumferential rotation drive module is connected to the main housing and located on one side of the main rotation mechanism, driving the main rotation mechanism to rotate circumferentially;

[0010] Several probe swing modules are connected to the main rotary mechanism. Each probe swing module is connected to a probe, which inspects the dissimilar metal weld of the control rod drive mechanism.

[0011] A radial drive module is connected to the main rotary mechanism to drive the probe to rotate radially.

[0012] The inspection device positioning module includes a positioning column and a connecting component; the connecting component is connected to the main rotary mechanism; the positioning column is located in the main rotary module and is rotatably connected to the connecting component to realize the circumferential positioning of the dissimilar metal weld inspection device and the control rod drive mechanism.

[0013] A sealing module is connected to the bottom of the main housing to seal and fix the dissimilar metal weld inspection device of the control rod drive mechanism relative to the control rod drive mechanism.

[0014] The circumferential rotation limit module is connected to the main housing and located on one side of the main rotation mechanism, controlling the circumferential rotation of the main rotation mechanism to stop.

[0015] Furthermore, the main rotating module also includes a fifth bearing mounted on the main housing, a gear ring mounted on the fifth bearing, and a connector mounted on the bottom of the main housing.

[0016] Furthermore, the circumferential rotation drive module includes a drive motor, a drive gear, and a circumferential rotation drive mounting base; the circumferential rotation drive module is connected to the main rotation mechanism through the circumferential rotation drive mounting base; the drive gear is driven and connected to the output end of the drive motor, and meshes with the gear ring, for transmitting the power of the drive motor to the gear ring, thereby realizing the circumferential rotation of the main rotation mechanism.

[0017] Furthermore, the probe swing module includes a first connecting mechanism, a synchronous pulley, a transmission shaft, an orthogonal gear pair, and a probe; the first connecting mechanism is connected to the main rotary mechanism; the synchronous pulley is connected to the upper surface of the first connecting mechanism; the transmission shaft is driven by the synchronous pulley; the orthogonal gear pair is driven by the transmission shaft and converts the circumferential rotation of the transmission shaft into radial rotation; the probe is connected to the output end of the orthogonal gear pair.

[0018] Furthermore, the probe swing module also includes an idler wheel, a first limit switch, a scale plate, and a swing rod; the idler wheel is connected to the first connecting mechanism and is configured to cooperate with the synchronous pulley to adjust the wrap angle between the synchronous pulley and the synchronous belt; the swing rod is connected to the output end of the orthogonal gear pair, and the first limit switch is located on one side of the output end of the orthogonal gear pair. The first limit switch and the swing rod cooperate to control the boundary of the probe's radial rotation; the scale plate is connected to the probe and is used to determine the injection direction of the probe at the end of the weld to be inspected.

[0019] Furthermore, the radial drive module includes a radial drive motor, a radial drive mounting base, and a drive pulley; the radial drive module is connected to the main rotary mechanism via the radial drive mounting base; the drive pulley is driven by the output end of the radial drive motor and is driven by the synchronous pulley of the probe swing module via a synchronous belt.

[0020] Furthermore, the positioning module of the inspection device also includes a fourth bearing installed on the upper part of the positioning column, a guide roller connected to the upper surface of the connecting assembly, and a cable fixing clamp; the positioning column and the connecting assembly are rotatably connected through the fourth bearing.

[0021] Furthermore, the sealing module includes a sealing mounting base connected to the bottom of the main housing, a pressure plate connected to the sealing mounting base, an airbag connected to the sealing mounting base, and an air nozzle opened on the sealing mounting base.

[0022] Furthermore, the circumferential rotation limiting module includes a limiting box connected to the main housing, a rotating rod partially inserted into the limiting box, a second limiting switch installed inside the limiting box and located on both sides of the rotating rod, and a fixing pin connected to the main rotating mechanism; when the rotating rod triggers the signal of the second limiting switch, the circumferential rotation driving module stops driving the circumferential rotation of the main rotating mechanism; the fixing pin is used to contact the portion of the rotating rod located outside the limiting box.

[0023] Furthermore, the circumferential rotation limiting module also includes limiting springs and limiting pins installed inside the limiting box and distributed on both sides of the rotating rod; the limiting springs are respectively connected to the two sides of the rotating rod so that the rotating rod is centered under normal conditions; the limiting pins are used to achieve mechanical limiting when the second limiting switch fails.

[0024] Furthermore, the dissimilar metal weld inspection device of the control rod drive mechanism also includes a defect marking module; the defect marking module includes a second connecting mechanism connected to the main rotary mechanism, a second cylinder connected to the second connecting mechanism, and a marking component connected to the output end of the second cylinder.

[0025] Furthermore, the control rod drive mechanism dissimilar metal weld inspection device also includes a water purging module; the water purging module includes a third connecting mechanism connected to the main rotary mechanism, a third cylinder connected to the third connecting mechanism, and a purging assembly connected to the output end of the third cylinder.

[0026] Furthermore, the dissimilar metal weld inspection device of the control rod drive mechanism also includes an inspection device limiting module; the inspection device limiting module includes a limiting block, a first cylinder, a disassembly assembly, a first limiting frame, and a second limiting frame; the first limiting frame is connected to the side wall of the main housing; the disassembly assembly connects the first limiting frame and the second limiting frame; the first cylinder is connected to the second limiting frame; and the limiting block is connected to the output end of the first cylinder.

[0027] The implementation of this invention has the following beneficial effects:

[0028] The control rod drive mechanism dissimilar metal weld inspection device of the present invention extends the positioning column in the positioning module of the inspection device into the main body rotation module to achieve circumferential positioning of the inspection device and the control rod drive mechanism, and uses the sealing module to hold the control rod drive mechanism to achieve positioning and fixation of the entire inspection device, thereby achieving the effect of inspecting the Ω weld in the middle of the control rod drive mechanism.

[0029] This invention utilizes the cooperation of a probe swing module, a main body rotation module, and a circumferential rotation drive module to achieve circumferential rotation of the probe, and utilizes the cooperation of a probe swing module and a radial drive module to achieve radial rotation of the probe, thereby enabling comprehensive inspection of the Ω weld seam in the middle of the control rod drive mechanism. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the dissimilar metal weld inspection device for the control rod drive mechanism of the present invention. Figure 1 ;

[0031] Figure 2 This is a schematic diagram of the structure of the dissimilar metal weld inspection device for the control rod drive mechanism of the present invention. Figure 2 ;

[0032] Figure 3 This is a schematic diagram of the circumferential rotation drive module structure of the present invention;

[0033] Figure 4 This is a schematic diagram of the limiting module structure of the inspection device of the present invention;

[0034] Figure 5 This is a schematic diagram of the probe swing module structure of the present invention;

[0035] Figure 6 This is a schematic diagram of the defect marking module structure of the present invention;

[0036] Figure 7 This is a schematic diagram of the water purging module structure of the present invention;

[0037] Figure 8 This is a schematic diagram of the positioning module structure of the inspection device of the present invention;

[0038] Figure 9 This is a schematic diagram of the main rotating module and sealing module of the present invention;

[0039] Figure 10 This is a schematic diagram of the circumferential limiting module structure of the present invention;

[0040] Figure 11 This is a schematic diagram of the circumferential positioning of the dissimilar metal weld inspection device of the control rod drive mechanism of the present invention.

[0041] Figure 12 This is a schematic diagram of the working state of the dissimilar metal weld inspection device of the control rod drive mechanism of the present invention.

[0042] in:

[0043] 1-Circumferential rotary drive module, 11-Motor housing, 12-Drive motor, 13-Coupling, 14-End shaft, 15-First bearing, 16-Drive gear, 17-Circumferential rotary drive mounting base;

[0044] 2-Radial drive module, 21-Radial drive mounting base, 22-Drive pulley;

[0045] 3-Inspection device limit module, 31-Limit block, 32-First cylinder, 33-Disassembly assembly, 34-First limit frame, 35-Second limit frame;

[0046] 4-Probe swing module, 41-First connecting mechanism, 42-Synchronous pulley, 43-Idler pulley, 44-Drive shaft, 45-Orthogonal gear pair, 46-First limit switch, 47-Probe, 48-Scale plate, 49-Swing rod; 411-First connecting plate, 412-Connecting frame, 413-Orthogonal gear pair output plate, 414-Probe frame, 415-Orthogonal gear pair mounting box;

[0047] 5-Defect marking module, 51-Marking component, 52-Spring, 53-Second bearing, 54-Second cylinder, 55-First fixed post, 56-First guide post, 57-Second connecting mechanism, 58-Marking component guide rod; 571-Second connecting plate, 572-Second cylinder mounting plate, 573-Marking component guide plate, 574-Marking component mounting base;

[0048] 6-Water purging module, 61-Second fixed column, 62-Third cylinder, 63-Second guide column, 64-Purge assembly, 65-Third bearing, 66-Third connecting mechanism; 661-Third connecting plate, 662-Third cylinder mounting plate, 663-Purge assembly mounting plate;

[0049] 7-Inspection device positioning module, 71-Positioning column, 72-Fourth bearing, 73-Connecting assembly, 74-Guide roller, 75-Cable fixing clamp;

[0050] 8-Main rotating module, 81-Main housing, 82-Fifth bearing, 83-Main rotating mechanism, 84-Gear ring, 85-Joint;

[0051] 9-Sealing module, 91-Sealing mounting base, 92-Airbag, 93-Pressure plate, 94-Air nozzle;

[0052] 10-Circumferential rotation limit module, 101-Limit box, 102-Rotation rod, 103-Limit spring, 104-Limit pin, 105-Second limit switch, 106-Fixing pin;

[0053] A-Ω weld;

[0054] B-Control Rod Drive Mechanism (CRDM). Detailed Implementation

[0055] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the invention will now be described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing the present invention and do not indicate that the device or element referred to must have a specific orientation; therefore, they should not be construed as limitations on the present invention.

[0056] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are used only for the convenience of describing the present invention and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood according to the specific circumstances.

[0057] Reference Figures 1 to 12 This invention relates to a device for inspecting dissimilar metal welds in a control rod drive mechanism, as described in some embodiments. The device includes: a main rotating module 8, comprising a hollow main rotating mechanism 83 and a hollow main housing 81, the main rotating mechanism 83 being rotatably connected to the main housing 81; a circumferential rotating drive module 1, connected to the main housing 81 and located on one side of the main rotating mechanism 83, driving the main rotating mechanism 83 to rotate circumferentially; several probe swing modules 4, connected to the main rotating mechanism 83, each probe swing module 4 having a probe 47 connected to it, the probe 47 inspecting the dissimilar metal welds in the control rod drive mechanism; and a radial drive module 2, connected to the main rotating mechanism 83, driving... The probe 47 rotates radially; the inspection device positioning module 7 includes a positioning post 71 and a connecting component 73; the connecting component 73 is connected to the main rotary mechanism 83; the positioning post 71 is located in the main rotary module 8 and is rotatably connected to the connecting component 73 to achieve circumferential positioning of the dissimilar metal weld inspection device and the control rod drive mechanism; the sealing module 9 is connected to the bottom of the main housing 81 to seal and fix the dissimilar metal weld inspection device and the control rod drive mechanism relative to each other; the circumferential rotation limit module 10 is connected to the main housing 81 and is located on one side of the main rotary mechanism 83 to control the circumferential rotation of the main rotary mechanism 83 to stop.

[0058] In some embodiments, such as Figure 9As shown, the main rotating module 8 is the supporting structure of the dissimilar metal weld inspection device of the control rod drive mechanism. It also includes a fifth bearing 82 mounted on the main housing 81, a gear ring 84 mounted on the fifth bearing 82, and a connector 85 mounted on the bottom of the main housing 81. Specifically, both the main rotating mechanism 83 and the main housing 81 are hollow structures. The fifth bearing 82 is a thin-walled bearing. The main rotating mechanism 83 and the main housing 81 are connected through the thin-walled bearing. Under the action of the circumferential rotating drive module 1, the gear ring 84, which is fixedly connected to the main rotating mechanism 83, is driven to drive the main rotating mechanism 83 to rotate around the main housing 81. A connector 85 is installed on the lower side of the main housing 81. This connector 85 is the inlet and outlet channel for coupling water.

[0059] In some embodiments, such as Figure 3 As shown, the circumferential rotation drive module 1 includes a drive motor 12, a drive gear 16, and a circumferential rotation drive mounting base 17. The circumferential rotation drive module 1 is connected to the main rotation mechanism 83 through the circumferential rotation drive mounting base 17. The drive gear 16 is connected to the output end of the drive motor 12 and meshes with the gear ring 84 to transmit the power of the drive motor 12 to the gear ring 84, thereby realizing the circumferential rotation of the main rotation mechanism 83.

[0060] Specifically, a motor housing 11 is connected to the circumferential rotary drive mounting base to encapsulate the circumferential rotary drive module 1 and prevent external interference. The drive motor 12 is installed inside the motor housing 11. A coupling 13, an end shaft 14, and a drive gear 16 are connected in sequence below the drive motor 12. A first bearing 15 is installed between the end shaft 14 and the motor housing 11, so that the power generated by the drive motor 12 is transmitted to the end shaft 14 through the coupling 13, which drives the drive gear 16 to rotate, and then drives the gear ring 84 to rotate circumferentially, thereby realizing the power output of the circumferential rotary drive module.

[0061] In some embodiments, such as Figure 10 As shown, the circumferential rotation limiting module 10 includes a limiting box 101 connected to the main housing 81, a rotating rod 102 partially inserted into the limiting box 101, a second limiting switch 105 installed inside the limiting box 101 and located on both sides of the rotating rod 102, and a fixing pin 106 connected to the main rotation mechanism 83; when the rotating rod 102 triggers the signal of the second limiting switch 105, the circumferential rotation drive module 1 stops driving the main rotation mechanism 83 to rotate circumferentially; the fixing pin 106 is used to contact the part of the rotating rod 102 located outside the limiting box 101. Furthermore, the circumferential rotation limit module 10 also includes limit springs 103 and limit pins 104 installed inside the limit box 101 and distributed on both sides of the rotation rod 102; the limit springs 103 are connected to the two sides of the rotation rod 102 respectively, so that the rotation rod 102 is centered under normal conditions; the limit pins 104 are used to achieve mechanical limit when the second limit switch 105 fails.

[0062] Specifically, the circumferential rotation limit module 10 is located at the edge of the main rotation module 8. Two second limit switches 105 are arranged inside the limit box 101. The middle part of the rotation rod 102 is movably connected to the limit box, allowing it to swing left and right. When the rotation rod 102 is located outside the limit box 101 and contacts the fixing pin 106 installed on the main rotation mechanism 83, the rotation rod 102 rotates around the central axis. When the rotation rod 102 reaches the sensing range of the second limit switch 105, a signal is triggered, reaching the limit. The drive motor 12 in the circumferential rotation drive module 1 stops running. Specifically, when the signal of the second limit switch 105 is triggered, the signal is transmitted to the main controller, which controls the drive motor 12 in the circumferential drive module 1 to stop running. The main controller can be any controller in the prior art that can receive limit switch signals and control the drive motor. When the second limit switch 105 malfunctions, the rotary rod 102 stops rotating after reaching the position of the limit pin 104, thereby stopping the main rotary mechanism 83 from circumferential rotation via the fixing pin 106, achieving the function of mechanical limit. The limit springs 103 are hooked on both sides of the rotary rod 102, keeping it in the center position under normal conditions, thus enabling the drive motor 12 in the circumferential rotary drive module 1 to operate normally and drive the main rotary mechanism 83 to rotate circumferentially.

[0063] In some embodiments, such as Figure 5 As shown, the probe swing module 4 includes a first connecting mechanism 41, a synchronous pulley 42, a transmission shaft 44, an orthogonal gear pair 45, and a probe 47. The first connecting mechanism 41 is connected to the main rotating mechanism 83. The synchronous pulley 42 is connected to the upper surface of the first connecting mechanism 41. The transmission shaft 44 is connected to the synchronous pulley 42. The orthogonal gear pair 45 is connected to the transmission shaft 44 and converts the circumferential rotation of the transmission shaft 44 into radial rotation. The probe 47 is connected to the output end of the orthogonal gear pair 45. Furthermore, the probe swing module 4 also includes an idler wheel 43, a first limit switch 46, a scale plate 48, and a swing rod 49; the idler wheel 43 is connected to the first connecting mechanism 41 and is configured to cooperate with the synchronous pulley 42 to adjust the wrap angle between the synchronous pulley 42 and the synchronous belt; the swing rod 49 is connected to the output end of the orthogonal gear pair 45, and the first limit switch 46 is located on one side of the output end of the orthogonal gear pair 45. The first limit switch 46 and the swing rod 49 cooperate to control the boundary of the radial rotation of the probe 47; the scale plate 48 is connected to the probe 47 and is used to determine the injection direction of the probe 47 at the end of the weld to be inspected.

[0064] Specifically, the first connecting mechanism 41 is the connecting / fixing mechanism for the various components in the probe swing module 4, including a first connecting plate 411, a connecting frame 412, an orthogonal gear pair output plate 413, a probe holder 414, and an orthogonal gear pair mounting box 415; the probe swing module 4 is fixedly connected to the main rotary mechanism 83 through the first connecting plate 411; the connecting frame 412 has a "7" shaped structure, and its upper surface is fixedly connected to the first connecting plate 411; the orthogonal gear pair mounting box 415 is fixedly connected to the bottom of the connecting frame 412; the orthogonal gear pair output plate 413 is fixedly connected to the output end of the orthogonal gear pair 45 and is movably connected to the surface of the orthogonal gear pair mounting box 415; the probe holder 414 is fixedly connected to the orthogonal gear pair output plate 413; and the synchronous pulley 42... The idler wheel 43 is connected to the upper surface of the connecting frame 412. The drive shaft 44 passes through the upper surface of the connecting frame 412 and the orthogonal gear pair mounting box 415. Its upper end is connected to the synchronous wheel 42 and its lower end is connected to the orthogonal gear pair 45. The first limit switch 46 is located on both sides of the orthogonal gear pair output plate 413, fixedly connected to the orthogonal gear pair mounting box 415, and electrically connected to the radial drive motor. The swing rod 49 is fixedly connected to the orthogonal gear pair output plate 413. The probe 47 is connected to the end of the probe frame 414, and the scale plate 48 is connected to the probe frame 414 and located in the middle of the probe frame 414. The number of probe swing modules 4 is 1-4, and the number can be any integer within this range, preferably 2, 3 or 4. The probe is a water immersion probe.

[0065] Understandably, the probe swing module 4 is fixedly connected to the main rotary mechanism 83 via the first connecting mechanism 41, enabling the circumferential rotation of the probe 47. The synchronous pulley 42, receiving power transmitted by the synchronous belt, drives the transmission shaft 44 to rotate. Through the orthogonal gear pair 45, the circumferential rotation is converted into radial rotation, ultimately driving the probe 47 to rotate radially, thus enabling the inspection of the Ω weld seam in the middle of the control rod drive mechanism at different angles. The first limit switch 46 is used to determine the swing boundary of the probe 47. When the swing rod 49 touches the first limit switch 46, the signal from the first limit switch 46 is transmitted to the main controller. The main controller controls the radial drive motor of the radial drive module 2 to stop running, and the probe 47 reaches the boundary of radial rotation. The scale plate 48 is used to determine the injection direction of the probe 47 into the weld seam to be inspected. After determining the injection direction, the incident angle of the probe 47 can be manually adjusted according to process requirements. When there is more than one probe swing module 4, after the radial rotation of the probe 47 ends and the injection direction is determined, the probes 47 in different probe swing modules 4 can be manually adjusted to different incident angles.

[0066] In some embodiments, such as Figure 1As shown, the radial drive module 2 includes a radial drive motor (not shown), a radial drive mounting base 21, and a drive pulley 22. The radial drive module 2 is connected to the main rotary mechanism 83 via the radial drive mounting base 21. The drive pulley 22 is connected to the output end of the radial drive motor and is connected to the synchronous pulley 42 of the probe swing module 4 via a synchronous belt.

[0067] Specifically, the radial drive module 2 is structurally similar to the circumferential rotation drive module 1, except that the output end of the radial drive module 2 is a drive pulley 22 instead of a drive gear 16. The drive pulley 22 is connected to the synchronous pulley 42 of the probe swing module 4 via a synchronous belt drive, thus realizing the power output of the radial drive module 2. When the inspection device contains multiple probe swing modules 4, the radial drive module 2 can have one drive pulley 22 connected to multiple synchronous pulleys 42 via a synchronous belt. Multiple drive pulleys 22 can be arranged parallel in the vertical direction, each connected to the synchronous pulley 42 of multiple probe swing modules 4. Alternatively, multiple radial drive modules 2 can be set up to control the radial rotation of the probe 47 one-to-one.

[0068] In some embodiments, such as Figure 6 As shown, the control rod drive mechanism dissimilar metal weld inspection device also includes a defect marking module 5; the defect marking module 5 includes a second connecting mechanism 57 connected to the main rotary mechanism 83, a second cylinder 54 connected to the second connecting mechanism 57, and a marking component 51 connected to the output end of the second cylinder 54.

[0069] Specifically, the defect marking module 5 is fixedly connected to the main rotary mechanism 83 via the second connecting plate 571. Below the second connecting plate 571, a second cylinder mounting plate 572, a marking component guide plate 573, and a marking component mounting base 574 are sequentially connected. The second connecting plate 571 and the second cylinder mounting plate 572 are fixedly connected via a first fixing post 55. A second cylinder 54 and a first guide post 56 are mounted on the second cylinder mounting plate 572. The output end of the second cylinder 54 is connected to the marking component guide plate 573. The first guide post 56 passes through the second cylinder mounting plate 572 and is connected to the marking component guide plate 573 via a second bearing 53. The second bearing 53 is fixedly connected to the marking component guide plate 573. The marking component guide plate 573 is vertically displaced relative to the second cylinder mounting plate 572. A marking component guide rod 58 is fixedly connected to the lower surface of the marking component guide plate 573. The other end of the marking component guide rod 58 is connected to the marking component mounting base 574 via a second bearing 53, which is fixedly connected inside the marking component mounting base 574. A spring 52 is fitted onto the portion of the marking component guide rod 58 located between the marking component guide plate 573 and the marking component mounting base 574 to buffer the movement of the marking component 51. The marking component 51 passes through the marking component guide plate 573 and the marking component mounting base 574, and is movably connected to the marking component guide plate 573 and fixedly connected to the marking component mounting base 574. The marking component 51 is a marker pen, the second bearing 53 is a linear bearing, and the second cylinder 54 is a needle-type cylinder.

[0070] Understandably, when a defect is detected, the second cylinder 54 extends, causing the marking component guide plate 573 to move downwards, thereby moving the marking component mounting base 574. This, in turn, presses the tip of the marking component 51 against the defect for marking, facilitating subsequent defect processing. The marking component 51 is fixed to the marking component mounting base 574 by screws. Two second bearings 53 are embedded inside the marking component mounting base 574. Under normal conditions, a spring 52 pushes the marking component mounting base 574 to its lower limit. When the second cylinder 54 extends, the spring 52 provides cushioning for the marking component 51, preventing damage to the marking component 51.

[0071] In some embodiments, such as Figure 7 As shown, the control rod drive mechanism dissimilar metal weld inspection device also includes a water purging module 6; the water purging module 6 includes a third connecting mechanism 66 connected to the main rotary mechanism 83, a third cylinder 62 connected to the third connecting mechanism 66, and a purging assembly 64 connected to the output end of the third cylinder 62.

[0072] Specifically, the water purging module 6 is fixedly connected to the main rotary mechanism 83 via a third connecting plate 661. Below the third connecting plate 661, a third cylinder mounting plate 662 and a purging assembly mounting plate 663 are sequentially connected. The third connecting plate 661 and the third cylinder mounting plate 662 are fixedly connected via a second fixing post 61. A third cylinder 62 is mounted on the third cylinder mounting plate 662, with its output end connected to the purging assembly mounting plate 663. A third bearing 65 is fixedly connected to the lower surface of the third cylinder mounting plate 662. The second guide post 63 passes through and movably connects the third cylinder mounting plate 662 and the third bearing 65, and is fixedly connected to the purging assembly mounting plate 663. A purging assembly 64 is fixedly connected below the purging assembly mounting plate 663. The third cylinder 62 is a needle cylinder, the purging assembly 64 is a purging tube, and the third bearing 65 is a linear bearing.

[0073] Understandably, the water purging module 6 is used at the end of the inspection. Since the weld seam of the middle Ω part of the control rod drive mechanism B is upward, there is a closed space inside. When draining water, it is difficult to drain the water by gravity alone. After the inspection is completed, the third cylinder 62 can be extended, and the solenoid valve controls the air circuit to make the purging component 64 blow air, controlling the main body rotation module 8 to rotate and clean the residual water in the inner groove.

[0074] In some embodiments, such as Figure 8 As shown, the inspection device positioning module 7 also includes a fourth bearing 72 installed on the upper part of the positioning column 71, a guide roller 74 connected to the upper surface of the connecting component 73, and a cable fixing clamp 75; the positioning column 71 and the connecting component 73 are rotatably connected through the fourth bearing 72.

[0075] Specifically, the positioning post 71 is a hollow cylindrical structure. The middle of the connecting component 73 is a hollow structure that mates with the upper part of the positioning post 71, and "7"-shaped structures are connected on both sides. The connecting component 73 is rotatably connected to the positioning post 71 via a fourth bearing 72, which enables the rotation of the positioning post 71 and the connecting component 73. The connecting component 73 is fixedly connected to the main rotary mechanism 83 via the bottom of the "7"-shaped structures on both sides. The positioning post 71 extends into the hollow part inside the main rotary module 8, and the inner diameter of the positioning post 71 is slightly larger than...

[0076] When the dissimilar metal weld inspection device of the control rod drive mechanism is circumferentially positioned with the CRDM, the bottom of the positioning post 71 abuts against the inner side of the Ω weld in the middle of the CRDM. The outer diameter of the positioning post 71 is smaller than the diameter of the circle formed by the Ω weld in the middle of the CRDM, thereby achieving circumferential positioning of the dissimilar metal weld inspection device of the control rod drive mechanism and the control rod drive mechanism. Since the fit clearance between the positioning post 71 and the CRDM is small, guide rollers 74 are fixed above the connecting assembly 73 to facilitate guidance during equipment hoisting. In this embodiment, there are 3 sets of guide rollers.

[0077] In some embodiments, such as Figure 9 As shown, the sealing module 9 includes a sealing mounting base 91 connected to the bottom of the main housing 81, a pressure plate 93 connected to the sealing mounting base 91, an airbag 92 connected to the sealing mounting base 91, and an air nozzle 94 opened on the sealing mounting base 91. Specifically, the pressure plate 93 includes upper and lower pressure plates. The airbag 92 in the sealing module 9 is in a free state under normal conditions and is pressed against the sealing mounting base 91 by the upper and lower pressure plates. After the dissimilar metal weld inspection device is positioned by the control rod drive mechanism, the airbag 92 is inflated and holds the inspection device tightly against the CRDM pipe wall, forming a cavity inside that can store coupling water. The air nozzle 94 is the inlet and outlet of the gas. The inner diameter of the sealing module 9 is slightly larger than the outer diameter of the middle part of the CRDM.

[0078] In some embodiments, such as Figure 4 As shown, the dissimilar metal weld inspection device of the control rod drive mechanism also includes an inspection device limiting module 3. The inspection device limiting module 3 includes a limiting block 31, a first cylinder 32, a disassembly assembly 33, a first limiting frame 34, and a second limiting frame 35. The first limiting frame 34 is connected to the side wall of the main housing 81. The disassembly assembly 33 connects the first limiting frame 34 and the second limiting frame 35. The first cylinder 32 is connected to the second limiting frame 35. The limiting block 31 is connected to the output end of the first cylinder 32. Specifically, the limiting block 31 is a V-shaped block. After the inspection device is circumferentially positioned, the first cylinder 32 drives the end limiting block 31 to extend, so that it engages with the outer surface of the surrounding control rod drive mechanism (CRDM) to achieve precise circumferential positioning. The disassembly assembly 33 is mainly used to realize the rapid disassembly of the inspection device limiting module 3 from the main body of the inspection mechanism, so as to significantly reduce the space occupied during transportation.

[0079] The method of using this control rod drive mechanism for inspecting dissimilar metal welds is as follows:

[0080] (1) The control rod drive mechanism for the dissimilar metal weld inspection device uses a special crane to lower the CRDM from the top to the inspection station. The first cylinder 32 of the inspection device limit module 3 is pushed out, pressing the limit block 31 against the two CRDM through parts in the surrounding 45° direction for positioning (e.g., Figure 11After positioning is completed, the airbag 92 on the sealing module 9 inflates, holding the inspection device tightly against the CRDM pipe wall. The first cylinder 32 of the inspection device limit module 3 retracts, and the equipment is ready for operation (e.g., Figure 12 ).

[0081] (2) Use the connector 85 at the bottom of the main housing 81 to fill the inspection device with coupling water until the coupling water level completely covers the probe, then stop filling the water.

[0082] (3) The radial drive module 2 drives the probe swing module 4 to swing the swing rod 49 to a fixed angle using the orthogonal gear pair 45. The drive gear 16 on the circumferential rotation drive module 1 rotates, and under the action of the gear ring 84 on the main rotation module 8, the probe swing module 4 rotates circumferentially, realizing the circumferential scanning of the weld. The starting and stopping positions of the scanning are controlled by the circumferential rotation limit module 10. After the inspection device scans one revolution, the swing rod 49 adjusts the swing angle and locks, and then the scanning is performed again until the end. When a defect is found, the circumferential rotation drive module 1 moves the defect marking module 5 to the defect location, extends the second cylinder 54 of the defect marking module 5, and presses the marking component 51 down onto the defect surface to mark it.

[0083] (4) After the inspection is completed, the inspection device starts to drain water. The water pump pumps the water inside the main housing 81 out through the connector 85. The third cylinder 62 of the water blowing module 6 extends out and blows air into the groove inside the Ω weld by the blowing assembly 64 to blow out the residual water.

[0084] (5) After the water is completely drained, the airbag 92 on the sealing module 9 is released through the air nozzle 94, the equipment is unlocked, and it is lifted off the CRDM pipe seat to complete all the scanning work.

[0085] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A device for inspecting dissimilar metal welds using a control rod drive mechanism, characterized in that, include: The main rotating module (8) includes a hollow main rotating mechanism (83) and a hollow main housing (81), wherein the main rotating mechanism (83) is rotatably connected to the main housing (81); A circumferential rotation drive module (1) is connected to the main housing (81) and located on one side of the main rotation mechanism (83), driving the main rotation mechanism (83) to rotate circumferentially; Several probe swing modules (4) are connected to the main rotary mechanism (83), and each probe swing module (4) is connected to a probe (47), which inspects the dissimilar metal weld of the control rod drive mechanism; A radial drive module (2) is connected to the main rotary mechanism (83) to drive the probe (47) to rotate radially; The inspection device positioning module (7) includes a positioning column (71) and a connecting component (73); the connecting component (73) is connected to the main rotary mechanism (83); the positioning column (71) is located in the main rotary module (8) and is rotatably connected to the connecting component (73) to realize the circumferential positioning of the dissimilar metal weld inspection device and the control rod drive mechanism. A sealing module (9) is connected to the bottom of the main housing (81) to seal and fix the dissimilar metal weld inspection device of the control rod drive mechanism relative to the control rod drive mechanism. A circumferential rotation limit module (10) is connected to the main housing (81) and located on one side of the main rotation mechanism (83), controlling the circumferential rotation of the main rotation mechanism (83) to stop.

2. The dissimilar metal weld inspection device of the control rod drive mechanism according to claim 1, characterized in that: The main rotating module (8) also includes a fifth bearing (82) mounted on the main housing (81), a gear ring (84) mounted on the fifth bearing (82), and a connector (85) mounted on the bottom of the main housing (81).

3. The dissimilar metal weld inspection device of the control rod drive mechanism according to claim 2, characterized in that: The circumferential rotation drive module (1) includes a drive motor (12), a drive gear (16), and a circumferential rotation drive mounting base (17). The circumferential rotation drive module (1) is connected to the main rotation mechanism (83) through the circumferential rotation drive mounting base (17). The drive gear (16) is connected to the output end of the drive motor (12) and meshes with the gear ring (84) to transmit the power of the drive motor (12) to the gear ring (84) and realize the circumferential rotation of the main rotation mechanism (83).

4. The dissimilar metal weld inspection device of the control rod drive mechanism according to claim 1, characterized in that: The probe swing module (4) includes a first connecting mechanism (41), a synchronous pulley (42), a transmission shaft (44), an orthogonal gear pair (45), and a probe (47); the first connecting mechanism (41) is connected to the main rotating mechanism (83); the synchronous pulley (42) is connected to the upper surface of the first connecting mechanism (41); the transmission shaft (44) is connected to the synchronous pulley (42); the orthogonal gear pair (45) is connected to the transmission shaft (44) and converts the circumferential rotation of the transmission shaft (44) into radial rotation; the probe (47) is connected to the output end of the orthogonal gear pair (45).

5. The dissimilar metal weld inspection device of the control rod drive mechanism according to claim 4, characterized in that: The probe swing module (4) also includes an idler wheel (43), a first limit switch (46), a scale plate (48), and a swing rod (49). The idler wheel (43) is connected to the first connecting mechanism (41) and is configured to cooperate with the synchronous pulley (42) to adjust the wrap angle between the synchronous pulley (42) and the synchronous belt. The swing rod (49) is connected to the output end of the orthogonal gear pair (45). The first limit switch (46) is located on one side of the output end of the orthogonal gear pair (45). The first limit switch (46) cooperates with the swing rod (49) to control the boundary of the radial rotation of the probe (47). The scale plate (48) is connected to the probe (47) and is used to determine the injection direction of the probe (47) at the end of the weld to be inspected.

6. The dissimilar metal weld inspection device of the control rod drive mechanism according to claim 4, characterized in that: The radial drive module (2) includes a radial drive motor, a radial drive mounting base (21), and a drive pulley (22); the radial drive module (2) is connected to the main rotary mechanism (83) through the radial drive mounting base (21); the drive pulley (22) is connected to the output end of the radial drive motor and is connected to the synchronous pulley (42) of the probe swing module (4) through a synchronous belt.

7. The dissimilar metal weld inspection device of the control rod drive mechanism according to claim 1, characterized in that: The circumferential rotation limiting module (10) includes a limiting box (101) connected to the main housing (81), a rotating rod (102) partially inserted into the limiting box (101), a second limiting switch (105) installed inside the limiting box (101) and located on both sides of the rotating rod (102), and a fixing pin (106) connected to the main rotating mechanism (83); when the rotating rod (102) triggers the signal of the second limiting switch (105), the circumferential rotation driving module (1) stops driving the circumferential rotation of the main rotating mechanism (83); the fixing pin (106) is used to contact the part of the rotating rod (102) located outside the limiting box (101).

8. The dissimilar metal weld inspection device of the control rod drive mechanism according to claim 1, characterized in that: The inspection device also includes a defect marking module (5); the defect marking module (5) includes a second connecting mechanism (57) connected to the main rotary mechanism (83), a second cylinder (54) connected to the second connecting mechanism (57), and a marking component (51) connected to the output end of the second cylinder (54).

9. The dissimilar metal weld inspection device of the control rod drive mechanism according to claim 1, characterized in that: The inspection device also includes a water purging module (6); the water purging module (6) includes a third connecting mechanism (66) connected to the main rotary mechanism (83), a third cylinder (62) connected to the third connecting mechanism (66), and a purging assembly (64) connected to the output end of the third cylinder (62).

10. The dissimilar metal weld inspection device of the control rod drive mechanism according to claim 1, characterized in that: The inspection device further includes an inspection device limiting module (3); the inspection device limiting module (3) includes a limiting block (31), a first cylinder (32), a disassembly assembly (33), a first limiting frame (34), and a second limiting frame (35); the first limiting frame (34) is connected to the side wall of the main housing (81); the disassembly assembly (33) connects the first limiting frame (34) and the second limiting frame (35); the first cylinder (32) is connected to the second limiting frame (35); the limiting block (31) is connected to the output end of the first cylinder (32).

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