Inspection device for inner wall of penetration piece of nuclear power plant

Abstract

The invention discloses a nuclear power plant penetration piece inner wall inspection device which comprises a detection mechanism, a connection mechanism and a lifting mechanism. An ultrasonic eddy current probe in the nuclear power plant penetration piece inner wall inspection device is hinged to probe clamping blocks through a first rotating shaft, the probe clamping blocks are hinged to a supporting frame through a second rotating shaft, the pair of probe clamping blocks are connected through an elastic piece, and under the cooperation of a lifting mechanism, the ultrasonic eddy current probe is fixed to the supporting frame. The ultrasonic eddy current probe is ensured to automatically adapt to the internal structure of the penetration piece when the inner wall of the penetration piece is inspected, and the ultrasonic eddy current probe is ensured to have a certain pressing force, so that the ultrasonic eddy current probe is effectively attached to a detected object, and the detection efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant reactor pressure vessel maintenance, and more particularly to a device for inspecting the inner wall of a penetrating component in a nuclear power plant. Background Technology

[0002] The reactor pressure vessel top cover of a nuclear power plant is a core piece of equipment in the reactor. Its main body is hemispherical, and several through-holes are installed on the top cover, forming irregular intersection lines between the top cover and the through-holes. Some of these through-holes have internal heat-shrinkable structures, while others do not. For the through-holes without heat-shrinkable structures, when these through-holes are distributed around the periphery of the top cover, the radial space between their center and the inner wall of the top cover is very limited. To perform non-destructive circumferential and axial inspection of the welds along the intersection lines through the inner wall of the through-holes, a specialized inspection device needs to be designed to address this problem. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an inspection device for the inner wall of a penetrating component in a nuclear power plant.

[0004] The technical solution adopted by the present invention to solve its technical problem is: to construct an inspection device for the inner wall of a nuclear power plant penetrating component, which includes a detection mechanism, a connection mechanism and a lifting mechanism;

[0005] The detection mechanism includes a pair of probe clamping blocks and an ultrasonic eddy current probe disposed on the probe clamping blocks;

[0006] The connecting mechanism is connected to the detection mechanism and the lifting mechanism respectively, and the lifting mechanism is used to drive the connecting mechanism and the detection mechanism to move up and down;

[0007] The connecting mechanism includes a support frame, the ultrasonic eddy current probe is hinged to the probe clamping block via a first rotating shaft, the probe clamping block is hinged to the support frame via a second rotating shaft, and a pair of probe clamping blocks are connected by an elastic element.

[0008] In some embodiments, the connecting mechanism further includes an upper centering block disposed on the top of the support frame.

[0009] In some embodiments, the connecting mechanism further includes a fixing block, a lower centering block, an upper coupling, an upper connecting pipe, a lower coupling, a lower connecting pipe, and a water collector, which are sequentially connected along the axial direction of the support frame, and the fixing block is connected to the bottom of the support frame.

[0010] In some embodiments, the connecting mechanism further includes a plurality of limiting members connected to the support frame, the upper end of the probe clamping block being located between the plurality of limiting members, and the limiting members being used to limit the movement of the probe clamping block.

[0011] In some embodiments, the probe clamping block is connected to a water supply interface.

[0012] In some embodiments, the water collector is provided with a drain outlet.

[0013] In some embodiments, the lower connecting pipe is provided with a cable tray, and the end of the lower connecting pipe is provided with an end plug.

[0014] In some embodiments, the lifting mechanism includes a positioning seat, a lifting transmission rod mounted on the positioning seat, a transmission slider that is pulsatorically connected to the lifting transmission rod, a connecting guide rail connected to the positioning seat, and a connecting slider that is movably connected to the connecting guide rail and connected to the transmission slider, wherein the connecting slider is connected to the water collector.

[0015] In some embodiments, the lifting mechanism further includes a mounting base connected to the positioning seat.

[0016] In some embodiments, the nuclear power plant penetration inner wall inspection device further includes a spring seat connected to the probe clamping block, and the elastic element is mounted on the spring seat.

[0017] The present invention has the following beneficial effects: the ultrasonic eddy current probe in the nuclear power plant penetrating inner wall inspection device is hinged to the probe clamping block through the first rotating shaft, and the probe clamping block is hinged to the support frame through the second rotating shaft. The pair of probe clamping blocks are connected by an elastic element. With the cooperation of the lifting mechanism, the ultrasonic eddy current probe can automatically adapt to the internal structure of the penetrating part when inspecting the inner wall of the penetrating part, and ensure that the ultrasonic eddy current probe has a certain clamping force, so that the ultrasonic eddy current probe can effectively fit with the object being inspected, thereby improving the detection efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings:

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the nuclear power plant penetration inner wall inspection device in some embodiments of the present invention;

[0020] Figure 2 This is a cross-sectional view of the internal structure of the nuclear power plant penetration inner wall inspection device in some embodiments of the present invention;

[0021] Figure 3 This is a structural front view of the nuclear power plant penetration inner wall inspection device in some embodiments of the present invention;

[0022] Figure 4 This is a schematic diagram illustrating the application of the nuclear power plant penetration inner wall inspection device in some embodiments of the present invention. Detailed Implementation

[0023] To provide a clearer understanding of the technical features, objectives, and effects of this invention, specific embodiments are now 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 this technical solution 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 this invention.

[0024] 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 only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features 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 this invention can be understood according to the specific circumstances.

[0025] Please see Figures 1 to 4This invention relates to an inspection device for the inner wall of a nuclear power plant penetration, as described in some embodiments of the present invention. The device includes a detection mechanism 1, a connecting mechanism 2, and a lifting mechanism 3. The detection mechanism 1 includes a pair of probe clamping blocks 11 and an ultrasonic eddy current probe 12 mounted on the probe clamping blocks 11. The connecting mechanism 2 is connected to both the detection mechanism 1 and the lifting mechanism 3. The lifting mechanism 3 drives the connecting mechanism 2 and the detection mechanism 1 to move vertically. The connecting mechanism 2 includes a support frame 21. The ultrasonic eddy current probe 12 is hinged to the probe clamping blocks 11 via a first rotating shaft 13, and the probe clamping blocks 11 are hinged to the support frame 21 via a second rotating shaft 14. The pair of probe clamping blocks 11 are connected by an elastic element 15. The nuclear power plant penetration inner wall inspection device also includes a spring seat 5 connected to the probe clamping blocks 11, with the elastic element 15 mounted on the spring seat 5. When the ultrasonic eddy current probe 12 enters the inner wall of the penetrating member 42 to begin inspection, the elastic member 15 provides elastic force to a pair of probe clamping blocks 11, so that the ultrasonic eddy current probe 12 can fit against the inner wall of the penetrating member 42 for inspection.

[0026] Understandably, in the inspection device for the inner wall of the penetrating component of the nuclear power plant, the ultrasonic eddy current probe 12 is hinged to the probe clamping block 11 via the first rotating shaft 13, and the probe clamping block 11 is hinged to the support frame 21 via the second rotating shaft 14. The pair of probe clamping blocks 11 are connected by an elastic element 15. With the cooperation of the lifting mechanism 3, the ultrasonic eddy current probe 12 can automatically adapt to the internal structure of the penetrating component 42 when inspecting the inner wall of the penetrating component 42, and ensure that the ultrasonic eddy current probe 12 has a certain clamping force, so that the ultrasonic eddy current probe 12 can effectively fit with the object being inspected, thereby improving the detection efficiency.

[0027] like Figures 1 to 3 As shown, the connecting mechanism 2 also includes an upper centering block 22 located on the top of the support frame 21. The upper centering block 22 can be connected to the support frame 21 by bolts. When the inspection device starts to inspect the inner wall of the penetrating member 42, the upper centering block 22 first enters the inner wall of the penetrating member 42 for centering and positioning.

[0028] The connecting mechanism 2 also includes a fixing block 23, a lower centering block 24, an upper coupling 25, an upper connecting pipe 26, a lower coupling 27, a lower connecting pipe 28, and a water collector 29, which are sequentially connected along the axial direction of the support frame 21. The fixing block 23 is connected to the bottom of the support frame 21. Specifically, the upper coupling 25, the upper connecting pipe 26, the lower coupling 27, and the lower connecting pipe 28 are hollow structures. The lower centering block 24 can cooperate with the upper centering block 22 for centering and positioning. Due to the arrangement of the upper coupling 25 and the lower coupling 27, the couplings allow a certain off-axis tilt angle. The upper centering block 22, the lower centering block 24, the upper coupling 25, and the lower coupling 27 together form a flexible connection structure that can absorb the positioning error of the inspection device. The water collector 29 can be used to collect the coupling water required for the ultrasonic eddy current probe 12 inspection.

[0029] like Figure 2 As shown, the connecting mechanism 2 also includes multiple limiting members 201 connected to the support frame 21. The upper end of the probe clamping block 11 is located between the multiple limiting members 201, and the limiting members 201 are used to limit the movement of the probe clamping block 11. The limiting member 201 can be a limiting screw to provide a limiting function for the rotational movement of the probe clamping block 11.

[0030] The probe holder 11 is connected to a water supply interface 121, while the water collector 29 is provided with a drain outlet 291. Specifically, the water supply interface 121 is located inside the support frame 21. The coupling water required for the ultrasonic eddy current probe 12 is supplied through the water supply interface 121, flows from top to bottom through the ultrasonic eddy current probe 12, the inner wall of the penetrating member 42, and the inner wall of the horn cover 43, flows into the water collector 29, and is finally collected through the drain outlet 291. After filtration, it returns to the water supply interface 121 to supply water to the ultrasonic eddy current probe 12.

[0031] In addition, the lower connecting pipe 28 is provided with a cable tray 281, which is used for the outlet of the ultrasonic eddy current probe cable and the water pipe. The end of the lower connecting pipe 28 is provided with an end plug 282, which blocks the end of the lower connecting pipe 28 to prevent coupling water from flowing out.

[0032] In some embodiments, the lifting mechanism 3 includes a positioning seat 31, a lifting transmission rod 32 mounted on the positioning seat 31, a transmission slider 33 pulsatorically connected to the lifting transmission rod 32, a connecting guide rail 34 connected to the positioning seat 31, and a connecting slider 35 movably connected to the connecting guide rail 34 and connected to the transmission slider 33. The connecting slider 35 is connected to the water collector 29. Specifically, the lifting transmission rod 32 is a cylinder rod, and the transmission slider 33 and the connecting slider 35 can be connected by bolts. Driven by the lifting transmission rod 32, the transmission slider 33 and the connecting slider 35 move upward, and the detection mechanism 1 and the connecting mechanism 2 are guided into the interior of the through member 42 via the conical surface of the horn cover 43. The lifting mechanism 3 also includes a mounting seat 36 connected to the positioning seat 31, which can be used for connection and positioning with an external structure.

[0033] The working principle of the inspection device for the inner wall of the penetrating component in the nuclear power plant is as follows: Figure 4 As shown, during non-destructive testing, the space for the inspection device is limited due to the proximity of the through-piece 42 to the outside of the top cover 41, thus requiring a certain axial extension. First, driven by the lifting transmission rod 32, the transmission slider 33 and connecting slider 35 move upwards. Then, through the external vertical lifting mechanism below the inspection device, it moves upwards and, under the flexible deformation of the upper centering block 22, lower centering block 24, upper coupling 25, and lower coupling 27, is guided into the interior of the through-piece 42 via the conical surface of the horn cover 43. Since the ultrasonic eddy current probe 12 is hinged to the probe clamping block 11 via the first rotating shaft 13, and the probe clamping block 11 is hinged to the support frame 21 via the second rotating shaft 14, and the pair of probe clamping blocks 11 are connected by an elastic element 15, the ultrasonic eddy current probe 12 passively adapts to the internal structure of the through-piece 42 and achieves effective contact with the inner surface of the through-piece 42, completing the inspection of the inner wall of the through-piece 42.

[0034] 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 the inner wall of a penetration component in a nuclear power plant, characterized in that, It includes a detection mechanism (1), a connecting mechanism (2), and a lifting mechanism (3); The detection mechanism (1) includes a pair of probe clamping blocks (11) and an ultrasonic eddy current probe (12) disposed on the probe clamping blocks (11); The connecting mechanism (2) is connected to the detection mechanism (1) and the lifting mechanism (3) respectively. The lifting mechanism (3) is used to drive the connecting mechanism (2) and the detection mechanism (1) to perform lifting movements. The connecting mechanism (2) includes a support frame (21), the ultrasonic eddy current probe (12) is hinged to the probe clamping block (11) via a first rotating shaft (13), the probe clamping block (11) is hinged to the support frame (21) via a second rotating shaft (14), and a pair of probe clamping blocks (11) are connected by an elastic element (15).

2. The nuclear power plant penetration component inner wall inspection device according to claim 1, characterized in that, The connecting mechanism (2) also includes an upper centering block (22) located on the top of the support frame (21).

3. The nuclear power plant penetration component inner wall inspection device according to claim 1, characterized in that, The connecting mechanism (2) further includes a fixing block (23), a lower centering block (24), an upper coupling (25), an upper connecting pipe (26), a lower coupling (27), a lower connecting pipe (28), and a water collector (29) connected sequentially along the axial direction of the support frame (21). The fixing block (23) is connected to the bottom of the support frame (21).

4. The nuclear power plant penetration component inner wall inspection device according to claim 1, characterized in that, The connecting mechanism (2) also includes a plurality of limiting members (201) connected to the support frame (21). The upper end of the probe clamping block (11) is located between the plurality of limiting members (201). The limiting members (201) are used to limit the movement of the probe clamping block (11).

5. The nuclear power plant penetration component inner wall inspection device according to claim 1, characterized in that, The probe clamping block (11) is connected to a water supply interface (121).

6. The nuclear power plant penetration inner wall inspection device according to claim 3, characterized in that, The water collector (29) is provided with a drain outlet (291).

7. The nuclear power plant penetration component inner wall inspection device according to claim 3, characterized in that, The lower connecting pipe (28) is provided with a cable tray (281), and the end of the lower connecting pipe (28) is provided with an end plug (282).

8. The nuclear power plant penetration inner wall inspection device according to claim 3, characterized in that, The lifting mechanism (3) includes a positioning seat (31), a lifting transmission rod (32) mounted on the positioning seat (31), a transmission slider (33) connected to the lifting transmission rod (32), a connecting guide rail (34) connected to the positioning seat (31), and a connecting slider (35) movably connected to the connecting guide rail (34) and connected to the transmission slider (33). The connecting slider (35) is connected to the water collector (29).

9. The nuclear power plant penetration inner wall inspection device according to claim 8, characterized in that, The lifting mechanism (3) also includes a mounting base (36) connected to the positioning base (31).

10. The nuclear power plant penetration inner wall inspection device according to claim 1, characterized in that, The nuclear power plant through-hole inner wall inspection device also includes a spring seat (5) connected to the probe clamping block (11), and the elastic element (15) is mounted on the spring seat (5).

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