Control rod driving mechanism dissimilar metal weld joint probe swinging device and scanning device

Abstract

The utility model discloses a control rod driving mechanism dissimilar metal weld joint probe swinging device and a scanning device. The control rod driving mechanism dissimilar metal weld joint probe swinging device comprises a positioning mechanism, a driving mechanism, a guiding mechanism, a connecting mechanism, a limiting mechanism and an air cylinder. The control rod driving mechanism dissimilar metal weld joint probe swing device can drive the guide mechanism and the connecting mechanism to move through the driving mechanism, so that the probe can have different scanning angles relative to dissimilar metal of the control rod driving mechanism, and the function that the probe can scan the dissimilar metal according to the different scanning angles can be achieved; therefore, the defects such as cracks, stress corrosion, collision traces and scratches on the surface of the dissimilar metal can be found in time, the inspection efficiency is greatly improved, and the working intensity and the irradiation dose accepted by personnel are reduced. Meanwhile, the air cylinder can drive the probe to move, obstacles can be avoided, and the stroke is increased to ensure the accessibility of the probe. And a limiting mechanism is arranged, so that the safety of the system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of nondestructive testing of nuclear power plants, in particular to a control rod driving mechanism heterogeneous metal weld probe swing device and a scanning device. Background Art

[0002] At present, many nuclear power plants at home and abroad have experienced omega weld leakage in the control rod drive mechanism during normal operation. Therefore, there is an urgent need for safety inspection of the special thin-walled omega welds of the control rod drive mechanism in the pre-service and in-service inspection of nuclear power plants.

[0003] The omega weld and the parent materials on both sides are thin, belonging to thin-walled parts, and the outer diameter is also small, which has high requirements for the detection method. During the scanning, an ultrasonic probe is required to perform radial scanning on it, so it is necessary to develop a special probe scanning mechanism. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a control rod driving mechanism dissimilar metal weld probe swing device and a scanning device.

[0005] The technical solution adopted by the utility model to solve the technical problem is: constructing a control rod driving mechanism heterogeneous metal weld probe swing device, which includes a positioning mechanism, a driving mechanism, a guiding mechanism, a connecting mechanism, a limiting mechanism and a cylinder;

[0006] The driving mechanism is connected to the positioning mechanism, the guiding mechanism is connected to the driving mechanism, and the driving mechanism is used to drive the guiding mechanism to move;

[0007] The connecting mechanism is connected to the guiding mechanism, the cylinder and the probe are both mounted on the connecting mechanism, and the cylinder is used to drive the probe to move;

[0008] The limiting mechanism is connected to the positioning mechanism and is used to limit the movement of the driving mechanism.

[0009] In some embodiments, the positioning mechanism includes a supporting frame, a swinging frame connected to the supporting frame, and an adapter plate connected to the supporting frame.

[0010] In some embodiments, the driving mechanism includes a synchronous wheel mounted on the support frame, a screw rod connected to the synchronous wheel in a transmission manner, a screw rod nut connected to the screw rod in a transmission manner, a swing connection seat connected to the screw rod nut, and an idler wheel mounted on the support frame and matched with the synchronous wheel;

[0011] The screw nut and the swing connection seat can move along the height direction of the support frame.

[0012] In some embodiments, the driving mechanism further includes a guide rail connected to the support frame body, a slider movably connected to the guide rail, and a swing retaining block connected to the swing connection seat, and the slider is also connected to the swing connection seat.

[0013] In some embodiments, the guiding mechanism includes a guiding shaft, a first clamping block, a second clamping block, a swing guiding block, and a limit rotary pin;

[0014] The swing frame body is provided with an arc-shaped guiding hole, and an arc-shaped guiding groove matching the arc-shaped guiding hole is provided on the outer side surface of the swing frame body;

[0015] The guiding shaft is connected to the swing retaining block, the first clamping block is connected to the guiding shaft, the first clamping block and the second clamping block are respectively arranged on both sides of the swing frame body, and the first clamping block and the second clamping block are connected by a plurality of locking members, and a plurality of the locking members all pass through the arc-shaped guiding hole;

[0016] The swing guiding block is simultaneously connected to the first clamping block and the second clamping block, the limit rotary pin is installed on the swing guiding block, and the limit rotary pin abuts against the arc-shaped guiding groove.

[0017] In some embodiments, the connecting mechanism includes a cylinder positioning frame connected to the swing guiding block, a cylinder connecting frame connected to the output end of the cylinder, a probe adjusting block connected to the cylinder connecting frame, a probe fixing frame connected to the probe adjusting block, and a guiding rod installed on the cylinder positioning frame;

[0018] The cylinder is installed on the cylinder positioning frame, and the probe is installed on the probe fixing frame.

[0019] In some embodiments, the probe adjusting block is provided with a plurality of adjusting holes and an adjusting through groove, the adjusting holes are used for connecting with the cylinder connecting frame, and the adjusting through groove is used for connecting with the probe fixing frame.

[0020] In some embodiments, the limiting mechanism includes an upper limit switch installed in the support frame body and a lower limit switch installed in the swing frame body.

[0021] In this embodiment, a scanning device is further constructed, which includes a plurality of the control rod driving mechanism dissimilar metal weld probe swing devices, a housing, a rotary mechanism, and a radial scanning mechanism;

[0022] The rotary mechanism is rotatably connected to the housing;

[0023] The radial scanning mechanism is connected to the rotary mechanism and is used to drive the driving mechanism to move;

[0024] The swing device of the dissimilar metal weld probe of the control rod drive mechanism is connected to the rotary mechanism through an adapter plate.

[0025] In some embodiments, the radial scanning mechanism includes a radial drive mounting seat connected to the rotary mechanism, a radial drive motor connected to the radial drive mounting seat, and a radial drive pulley connected to the output end of the radial drive motor. The synchronous pulley of the swing device of the dissimilar metal weld probe of the control rod drive mechanism is connected to the radial drive pulley through a synchronous belt.

[0026] Implementing the present utility model has the following beneficial effects: The swing device of the dissimilar metal weld probe of the control rod drive mechanism can drive the guiding mechanism and the connecting mechanism to move through the driving mechanism, so that the probe can have different scanning angles relative to the dissimilar metal of the control rod drive mechanism, and the function of the probe can scan the dissimilar metal at different scanning angles can be realized, so as to timely detect defects such as cracks, stress corrosion, collision marks and scratches on the surface of the dissimilar metal, greatly improving the inspection efficiency, reducing the work intensity and the radiation dose received by personnel. At the same time, the cylinder can drive the probe to move, avoid obstacles, and increase the stroke to ensure the accessibility of the probe. Moreover, a limiting mechanism is also provided to improve the safety of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the present utility model, the present utility model will be further described below in conjunction with the drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts. In the drawings:

[0028] Figure 1 is the overall structure diagram of the swing device of the dissimilar metal weld probe of the control rod drive mechanism in some embodiments of the present utility model;

[0029] Figure 2 is the overall structure diagram of the swing device of the dissimilar metal weld probe of the control rod drive mechanism in another direction in some embodiments of the present utility model;

[0030] Figure 3 is the structural schematic diagram of the guiding mechanism in some embodiments of the present utility model;

[0031] Figure 4 is the overall structure diagram of the scanning device in some embodiments of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] In order to have a clearer understanding of the technical features, objectives, and effects of the present utility model, the specific implementation manners of the present utility model will now be described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientation or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are based on the orientation or positional relationships shown in the drawings and are constructed and operated in a specific orientation. This is only for the convenience of describing the present technical solution and does not indicate that the indicated device or element must have a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0033] It should also be noted that, unless otherwise clearly defined and limited, terms such as "installation", "connection", "attachment", "fixation", "setting", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located above the other element, or there may also be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] Please refer to Figures 1 to 3 , which is a swing device 104 for the dissimilar metal weld probe of a control rod drive mechanism in some embodiments of the present utility model. It includes a positioning mechanism 1, a driving mechanism 2, a guiding mechanism 3, a connecting mechanism 4, a limiting mechanism 5, a cylinder 6, and a probe 7. The driving mechanism 2 is connected to the positioning mechanism 1, the guiding mechanism 3 is connected to the driving mechanism 2, and the driving mechanism 2 is used to drive the guiding mechanism 3 to move; the connecting mechanism 4 is connected to the guiding mechanism 3, and both the cylinder 6 and the probe 7 are installed on the connecting mechanism 4, and the cylinder 6 is used to drive the probe 7 to move; the limiting mechanism 5 is connected to the positioning mechanism 1 and is used to limit the movement of the driving mechanism 2.

[0035] Understandably, the swing device 104 of the dissimilar metal weld probe of the control rod drive mechanism can drive the guiding mechanism 3 and the connecting mechanism 4 through the driving mechanism 2, so that the probe 7 can have different scanning angles relative to the dissimilar metal of the control rod drive mechanism, and the function that the probe 7 can scan the dissimilar metal according to different scanning angles can be realized, so as to timely detect defects such as cracks, stress corrosion, collision marks and scratches on the surface of the dissimilar metal, greatly improving the inspection efficiency, reducing the work intensity and the radiation dose received by personnel. At the same time, the cylinder 6 can drive the probe 7 to move, avoid obstacles, and increase the stroke to ensure the accessibility of the probe 7. Moreover, a limiting mechanism 5 is also provided to improve the system safety.

[0036] In this embodiment, a scanning device is also constructed, as Figure 4 shown, which includes a plurality of swing devices 104 of the dissimilar metal weld probe of the control rod drive mechanism, a housing 101, a slewing mechanism 102 and a radial scanning mechanism 103; the slewing mechanism 102 is rotatably connected to the housing 101; the radial scanning mechanism 103 is connected to the slewing mechanism 102 and is used to drive the driving mechanism 2 to move; the swing device 104 of the dissimilar metal weld probe of the control rod drive mechanism is connected to the slewing mechanism 102 through an adapter plate 13.

[0037] The radial scanning mechanism 103 includes a radial drive mounting seat 1031 connected to the slewing mechanism 102, a radial drive motor 1032 connected to the radial drive mounting seat 1031, and a radial drive pulley 1033 connected to the output end of the radial drive motor 1032. The synchronous pulley 21 of the swing device 104 of the dissimilar metal weld probe of the control rod drive mechanism is connected to the radial drive pulley 1033 through a synchronous belt. The radial drive motor 1032 can be a DC servo motor, which can transmit power to the radial drive pulley 1033 through the output end. In this embodiment, the number of the probes 7 is six, and the number of the swing devices 104 of the dissimilar metal weld probe of the control rod drive mechanism is also six. The six synchronous pulleys 21 can be sequentially connected in series through a synchronous belt, and at the same time the synchronous belt is also connected to the radial drive pulley 1033. Only one radial drive motor 1032 is needed to drive the multiple probes 7 to achieve synchronous movement. When the radial drive motor 1032 is started, the driving mechanism 2 can be driven to move, so that the probe 7 also moves.

[0038] In addition, the scanning device further includes a circumferential drive mechanism 105 connected to the housing 101. The circumferential drive mechanism 105 is used to drive the slewing mechanism 102 to rotate on the housing 101. Under the combined action of the circumferential drive mechanism 105 and the radial scanning mechanism 103, while multiple probes 7 can scan the dissimilar metal at the same time according to different scanning angles, they can also perform a comprehensive scan along the circumferential direction of the dissimilar metal, greatly improving the scanning efficiency.

[0039] As Figure 1 and Figure 2 shown, the positioning mechanism 1 includes a support frame body 11, a swing frame body 12 connected to the support frame body 11, and a transfer plate 13 connected to the support frame body 11. The transfer plate 13 can be fixed to the slewing mechanism 102 by bolts, and the support frame body 11 and the swing frame body 12 can be connected by bolts or by welding.

[0040] The driving mechanism 2 includes a synchronous pulley 21 installed on the support frame body 11, a lead screw 22 drivingly connected to the synchronous pulley 21, a lead screw nut 23 drivingly connected to the lead screw 22, a swing connection seat 24 connected to the lead screw nut 23, and an idler pulley 25 installed on the support frame body 11 and arranged to match the synchronous pulley 21. Among them, the lead screw nut 23 and the swing connection seat 24 can move along the height direction of the support frame body 11. The idler pulley 25 is used to change the synchronous belt layout and adjust the wrap angle of the synchronous pulley 21 and the synchronous belt. In addition, the swing connection seat 24 has an L-shaped structure and is fixedly connected to the lead screw nut 23.

[0041] The driving mechanism 2 further includes a guide rail 26 connected to the support frame body 11, a slider 27 movably connected to the guide rail 26, and a swing retaining block 28 connected to the swing connection seat 24. The slider 27 is also connected to the swing connection seat 24. The guide rail 26 and the slider 27 can provide a guiding effect for the movement of the lead screw nut 23 and the swing connection seat 24, making the movement of the lead screw nut 23 and the swing connection seat 24 more stable. It can be understood that the synchronous pulley 21 is responsible for transmitting the power obtained from the synchronous belt to the lead screw 22, and under the action of the guide rail 26, the lead screw nut 23 makes a reciprocating up and down movement.

[0042] As Figure 2 and Figure 3 shown, the guiding mechanism 3 includes a guiding shaft 31, a first clamping block 32, a second clamping block 33, a swing guiding block 34, and a limit rotary pin 35. As Figure 1 shown, the swing frame body 12 is provided with an arc-shaped guiding hole 121, and an arc-shaped guiding groove 122 matching the arc-shaped guiding hole 121 is provided on the outer side surface of the swing frame body 12. The guiding shaft 31 is connected to the swing retaining block 28, the first clamping block 32 is connected to the guiding shaft 31, the first clamping block 32 and the second clamping block 33 are respectively arranged on both sides of the swing frame body 12, and the first clamping block 32 and the second clamping block 33 are connected by a plurality of locking members 36. The plurality of locking members 36 all pass through the arc-shaped guiding hole 121. The swing guiding block 34 is simultaneously connected to the first clamping block 32 and the second clamping block 33, the limit rotary pin 35 is installed on the swing guiding block 34, and the limit rotary pin 35 abuts against the arc-shaped guiding groove 122. The locking member 36 can be a copper sleeve.

[0043] Understandably, due to the function of the arc-shaped guiding hole 121, when the lead screw nut 23 and the swing connecting seat 24 move up and down, they will drive the first clamping block 32, the second clamping block 33 and the swing guiding block 34 to move in an arc. At this time, the angles of the first clamping block 32, the second clamping block 33 and the swing guiding block 34 relative to the control rod driving mechanism will change, which also causes the probe 7 installed on the connecting mechanism 4 to change its angle relative to the control rod driving mechanism. Thus, the function of controlling the scanning angle of the probe 7 relative to the control rod driving mechanism through the radial scanning mechanism 103 can be realized. In addition, the limit rotary pin 35 is responsible for limiting the lateral position of the swing guiding block 34.

[0044] As Figure 2 shown, the connecting mechanism 4 includes a cylinder positioning frame 41 connected to the swing guiding block 34, a cylinder connecting frame 42 connected to the output end of the cylinder 6, a probe adjustment block 43 connected to the cylinder connecting frame 42, a probe fixing frame 44 connected to the probe adjustment block 43, and a guiding rod 45 installed on the cylinder positioning frame 41. The cylinder 6 is installed on the cylinder positioning frame 41, and the probe 7 is installed on the probe fixing frame 44. The probe 7 can be an ultrasonic probe. When inspecting the weld of dissimilar metals, the probe 7 swings with the movement of the guiding mechanism 3, and continuous and equidistant scanning of the weld of dissimilar metals in the vertical section can be realized. In addition, the cylinder 6 can make the probe 7 bypass the interference area above the weld, avoid obstacles when the scanning device is seated, and when the positioning is completed for inspection, the cylinder 6 extends to ensure the relative position relationship between the probe 7 and the part to be inspected. The guiding rod 45 is used to provide guiding for the movement of the probe adjustment block 43.

[0045] The probe adjustment block 43 is provided with a plurality of adjustment holes 431 and adjustment through slots 432. The adjustment holes 431 are used to connect with the cylinder connecting frame 42, and the adjustment through slots 432 are used to connect with the probe fixing frame 44. The setting of the plurality of adjustment holes 431 and adjustment through slots 432 can adjust the position of the probe 7 according to the on-site situation, enhancing the applicability of the device.

[0046] As Figure 1 shown, the limiting mechanism 5 includes an upper limit switch 51 installed in the support frame body 11 and a lower limit switch 52 installed on the swing frame body 12. Through the setting of the upper limit switch 51 and the lower limit switch 52, the position of the swing connecting seat 24 can be sensed, thereby avoiding the possibility of mechanical collision causing excessive current and damage to components.

[0047] The usage method of the control rod driving mechanism dissimilar metal weld probe swing device 104 is as follows:

[0048] 1. The scanning device is positioned at the detection station from the top. At this time, the cylinder 6 is in a contracted state to prevent the probe 7 from colliding with the control rod drive mechanism;

[0049] 2. After the synchronous pulley 21 obtains power, it rotates and drives the lead screw nut 23 on the lead screw 22 to move downward to the lower limit switch 52, triggering the lower limit switch 52. During the movement, the first clamping block 32, the second clamping block 33, and the locking member 36 slide along the arc-shaped guide hole 121;

[0050] 3. After triggering the lower limit switch 52, it is marked as the scanning zero point, the cylinder 6 is extended, and the probe 7 is extended to the detection station;

[0051] 4. The synchronous pulley 21 rotates in reverse, driving the probe 7 to slide upward to radially scan the weld of dissimilar metals;

[0052] 5. When the swing connecting seat 24 touches the upper limit switch 51, the radial drive motor 1032 stops moving and the scanning stops;

[0053] 6. After the scanning is completed, the cylinder 6 retracts, driving the probe 7 away from the control rod drive mechanism.

[0054] It can be understood that the above embodiments only express the preferred implementation modes of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present invention; therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. A control rod drive mechanism dissimilar metal weld probe swing device, characterized in that: It comprises a positioning mechanism (1), a driving mechanism (2), a guiding mechanism (3), a connecting mechanism (4), a limiting mechanism (5) and a cylinder (6); The driving mechanism (2) is connected to the positioning mechanism (1), the guiding mechanism (3) is connected to the driving mechanism (2), and the driving mechanism (2) is used to drive the guiding mechanism (3) to move; The connecting mechanism (4) is connected to the guiding mechanism (3), the cylinder (6) and the probe (7) are both mounted on the connecting mechanism (4), and the cylinder (6) is used to drive the probe (7) to move; The limiting mechanism (5) is connected to the positioning mechanism (1) and is used to limit the movement of the driving mechanism (2).

2. The control rod drive mechanism dissimilar metal weld probe swing device according to claim 1, characterized in that: The positioning mechanism (1) comprises a supporting frame (11), a swinging frame (12) connected to the supporting frame (11), and an adapter plate (13) connected to the supporting frame (11).

3. The control rod drive mechanism dissimilar metal weld probe swing device according to claim 2, characterized in that: The driving mechanism (2) comprises a synchronous wheel (21) mounted on the support frame (11), a screw rod (22) drivingly connected to the synchronous wheel (21), a screw rod nut (23) drivingly connected to the screw rod (22), a swing connection seat (24) connected to the screw rod nut (23), and an idler wheel (25) mounted on the support frame (11) and matched with the synchronous wheel (21); The screw nut (23) and the swing connection seat (24) are capable of moving along the height direction of the support frame (11).

4. The control rod drive mechanism dissimilar metal weld probe swing device according to claim 3, characterized in that: The driving mechanism (2) further comprises a guide rail (26) connected to the support frame (11), a slider (27) movably connected to the guide rail (26), and a swing retaining block (28) connected to the swing connection seat (24); the slider (27) is also connected to the swing connection seat (24).

5. The control rod drive mechanism dissimilar metal weld probe swing device according to claim 4, characterized in that: The guide mechanism (3) comprises a guide shaft (31), a first clamping block (32), a second clamping block (33), a swing guide block (34) and a limit rotation pin (35); The swing frame (12) is provided with an arc-shaped guide hole (121), and an outer surface of the swing frame (12) is provided with an arc-shaped guide groove (122) matched with the arc-shaped guide hole (121); The guide shaft (31) is connected to the swing retaining block (28), the first clamping block (32) is connected to the guide shaft (31), the first clamping block (32) and the second clamping block (33) are separately arranged on both sides of the swing frame (12), and the first clamping block (32) and the second clamping block (33) are connected by a plurality of locking members (36), and the plurality of locking members (36) are all penetrated in the arc-shaped guide hole (121); The swing guide block (34) is connected to the first clamping block (32) and the second clamping block (33) at the same time, the limit rotation pin (35) is installed on the swing guide block (34), and the limit rotation pin (35) abuts against the arc-shaped guide groove (122).

6. The control rod drive mechanism dissimilar metal weld probe swing device according to claim 5, characterized in that: The connecting mechanism (4) comprises a cylinder positioning frame (41) connected to the swing guide block (34), a cylinder connecting frame (42) connected to the output end of the cylinder (6), a probe adjusting block (43) connected to the cylinder connecting frame (42), a probe fixing frame (44) connected to the probe adjusting block (43), and a guide rod (45) mounted on the cylinder positioning frame (41); The cylinder (6) is mounted on the cylinder positioning frame (41), and the probe (7) is mounted on the probe fixing frame (44).

7. The control rod drive mechanism dissimilar metal weld probe swing device according to claim 6, characterized in that: The probe adjustment block (43) is provided with a plurality of adjustment holes (431) and adjustment through slots (432), wherein the adjustment holes (431) are used to be connected to the cylinder connecting frame (42), and the adjustment through slots (432) are used to be connected to the probe fixing frame (44).

8. The control rod drive mechanism dissimilar metal weld probe swing device according to claim 7, characterized in that: The limit mechanism (5) comprises an upper limit switch (51) installed in the support frame (11) and a lower limit switch (52) installed in the swing frame (12).

9. A scanning device, characterized in that: The invention comprises a plurality of control rod drive mechanism dissimilar metal weld probe swing devices (104) as claimed in any one of claims 1 to 8, a shell (101), a rotating mechanism (102) and a radial scanning mechanism (103); The rotating mechanism (102) is rotatably connected to the housing (101); The radial scanning mechanism (103) is connected to the rotating mechanism (102) and is used to drive the driving mechanism (2) to move; The control rod driving mechanism dissimilar metal weld probe swing device (104) is connected to the rotary mechanism (102) via an adapter plate (13).

10. The scanning device according to claim 9, characterized in that: The radial scanning mechanism (103) comprises a radial drive mounting seat (1031) connected to the rotary mechanism (102), a radial drive motor (1032) connected to the radial drive mounting seat (1031), and a radial drive pulley (1033) connected to the output end of the radial drive motor (1032); the synchronous wheel (21) of the control rod drive mechanism dissimilar metal weld probe swing device (104) is connected to the radial drive pulley (1033) via a synchronous belt.

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