A double-layer casing inspection device for floating nuclear power plant pressure vessels

Abstract

The present invention relates to the technical field of ultrasonic inspection of casings of pressure vessels, and specifically discloses a floating nuclear power plant pressure vessel double-layer casing inspection device. The floating device body in the device can swim in the pressure vessel, and the strip inspection tool provided at the lower end of the floating device body is inserted into the main pipeline of the pressure vessel, and the entire inspection device is clamped and fixed on the upper partition of the pressure vessel by using the fixing components on the floating device body; the inspection tool can move circumferentially along the central axis of the main pipeline of the pressure vessel, and drive the probe assembly in the inspection tool to move along the axis of the main pipeline. The inspection device is sent to the double-layer casing attachment through the floating device body, and the inspection device is fixed on the upper partition of the pressure vessel by the fixing components, which has higher flexibility, compact structure and light weight; the inspection tool can perform circumferential rotation and axial movement, and can perform circumferential and axial non-destructive inspection on the main pipeline of the double-layer casing pressure vessel.

Description

Technical Field

[0001] The invention belongs to the technical field of ultrasonic inspection of casings of pressure vessels, and in particular relates to a double-layer casing inspection device for pressure vessels of floating nuclear power plants. Background Art

[0002] The pressure vessel is one of the most important equipment in a nuclear power plant and plays a very important role in the safe operation of the nuclear power plant. The main pipeline is located around the pressure vessel and runs through the steam generator when the nuclear power plant is working. According to relevant regulations, it is necessary to conduct non-destructive inspections on the main pipeline welds regularly. At present, there are dozens of core types in nuclear power plants at home and abroad. The main pipelines of most types of reactors are hollow, so the inspection methods and inspection devices are relatively simple.

[0003] The main pipeline of the double-layer pipe casing is a special structure. There is a small casing inside the main pipeline. The small casing is placed at the bottom of the main pipeline, which makes the small casing and the main pipeline non-concentric. Therefore, it is more difficult to inspect the weld of the main pipeline, and there will be a part of the inspection blind area. Summary of the invention

[0004] The purpose of the present invention is to provide a double-layer casing inspection device for a floating nuclear power plant pressure vessel, so as to solve the problem of ultrasonic inspection of the main pipeline of the double-layer casing of the pressure vessel.

[0005] The technical solution of the present invention is as follows: a floating nuclear power plant pressure vessel double-layer casing inspection device, the device includes a floating device body, a fixing component and an inspection tool, wherein the floating device body can swim in the pressure vessel, and the strip inspection tool provided at the lower end of the floating device body is inserted into the main pipeline of the pressure vessel, and the entire inspection device is clamped and fixed on the upper partition of the pressure vessel by using the fixing component on the floating device body; the inspection tool can move circumferentially along the central axis of the main pipeline of the pressure vessel, and drive the probe assembly in the inspection tool to move along the axis direction of the main pipeline.

[0006] The inspection tool includes an inspection tool mounting seat, a circumferential motor, an axial motion mounting seat and a probe assembly, wherein the upper part of the inspection tool mounting seat is installed on the lower end of the floating device body, and the other end of the inspection tool mounting seat is connected to one end of the rod-shaped axial motion mounting seat through a bearing. A circumferential motor is fixedly provided on the side of the inspection tool mounting seat, and the circumferential motor rotor is connected to the axial motion mounting seat. The axial motion mounting seat can be driven to move circumferentially through the circumferential motor; a slide rail is provided at the other end of the axial motion mounting seat, and a probe assembly is provided on the slide rail, and the probe assembly can move axially along the slide rail.

[0007] The inspection tool also includes an axial motor, a guide shaft and a screw, wherein the axial motor is arranged on the side of the other end of the axial motion mounting seat away from the inspection tool mounting seat; a slide rail is provided on the other side of the axial motion mounting seat, and the slide rail includes a guide shaft and a screw, the guide shaft is fixedly connected to the axial motion mounting seat, and the screw is connected to the axial motor rotor. The screw is driven to rotate by the axial motor, which can drive the slider sleeved on the guide shaft to move forward and backward along the guide shaft; the probe assembly is arranged on the slider.

[0008] The axial motion mounting seat is provided with two mutually parallel guide shafts, one end of the guide shaft is fixedly connected to the axial motion mounting seat, and the other end is connected to the end cover to form a sliding track with closed ends; the left end of the lead screw is arranged on the axial motion mounting seat through a bearing and is fixed to the axial motor rotor, and the right end of the lead screw is arranged on the end cover through a pair of bearings, so that the lead screw can rotate relative to the axial motion mounting seat and the end cover; a slider is sleeved on the guide shaft, and a threaded hole matching the lead screw is processed on the slider, and the lead screw is rotated to drive the slider to move forward and backward along the guide shaft.

[0009] The fixing components include a frame, a floating block and a clamp, wherein a floating block is provided inside the frame shell structure to provide buoyancy for the entire inspection device; a clamp is provided on the frame, and the clamp matches the structure of the upper partition of the pressure vessel. The entire inspection device can be fixed by clamping the clamp on the upper partition.

[0010] The center of rotation of the circumferential rotation of the inspection tool is concentric with the center of the main pipeline of the pressure vessel; the axis of the slide rail is consistent with the axis of the main pipeline.

[0011] The remarkable effect of the present invention is that: the double-layer casing inspection device of the floating nuclear power plant pressure vessel described in the present invention can send the inspection device to the double-layer casing accessories through the floating device body, and fix the inspection device on the upper partition of the pressure vessel through the fixing components, which has higher flexibility, compact structure and light weight; the inspection tool can perform circumferential rotation and axial movement, and can perform circumferential and axial non-destructive inspection on the main pipeline of the double-layer casing pressure vessel. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the overall application environment of a double-layer casing inspection device for a floating nuclear power plant pressure vessel according to the present invention;

[0013] Figure 2 This is a schematic diagram of the structure of the fixed components in a double-layer casing inspection device for a floating nuclear power plant pressure vessel according to the present invention;

[0014] Figure 3This is a schematic diagram of the structure of the inspection tool in the double-layer casing inspection device for the pressure vessel of a floating nuclear power plant according to the present invention;

[0015] Figure 4 It is a top view of the inspection tool in the double-layer casing inspection device for the pressure vessel of a floating nuclear power plant according to the present invention;

[0016] In the figure: 1. floating device body; 2. fixing parts; 3. inspection tool; 4. frame; 5. float block; 6. clamp; 7. inspection tool mounting seat; 8. circumferential motor; 9. axial motion mounting seat; 10. axial motor; 11. guide shaft; 12. lead screw; 13. slider; 14. probe assembly; 15. end cover. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] like Figure 1 As shown, a floating nuclear power plant pressure vessel double-layer casing inspection device comprises a floating device body 1, a fixing component 2 and an inspection tool 3, wherein the floating device body 1 can swim in the pressure vessel, the long strip inspection tool 3 installed at the lower end of the floating device body 1 is inserted into the main pipeline of the pressure vessel, and the entire inspection device is clamped on the upper partition of the pressure vessel by using the fixing component 2 installed at the upper end of the floating device body 1; the inspection tool 3 can move circumferentially along the central axis of the main pipeline, and drive the probe assembly 14 in the inspection tool 3 to move along the axis of the inspection tool 3;

[0019] like Figure 2 As shown, the fixing component 2 includes a frame 4, a floating block 5 and a clamp 6, wherein the frame 4 is a frame shell structure, the lower part of which is fixedly connected to the upper part of the floating device body 1, and a floating block 5 is fixed inside the frame 4, and the floating block 5 is used to provide buoyancy for the inspection device; a clamp 6 is fixedly installed on the upper part of the frame 4, which matches the structure of the upper diaphragm of the pressure vessel, and the clamp 6 is clamped on the upper diaphragm to fix the entire inspection device;

[0020] like Figure 3 , Figure 4As shown, the inspection tool 3 includes an inspection tool mounting seat 7, a circumferential motor 8, an axial motion mounting seat 9, an axial motor 10 and a probe assembly 14, wherein the upper portion of the inspection tool mounting seat 7 is fixedly mounted on the lower end of the floating device body (1), and the other end of the inspection tool mounting seat 7 is connected to one end of the rod-shaped axial motion mounting seat 9 through a pair of bearings, and the rotor of the circumferential motor 8 installed on the side of the inspection tool mounting seat 7 is fixedly connected to the axial motion mounting seat 9, and the circumferential motor 8 can be used to drive the axial motion mounting seat 9 to move circumferentially; an axial motor 10 is fixed on one side of the other end of the axial motion mounting seat 9, and the other side is connected to the end cover 15 through two parallel guide shafts 11 to form a sliding track with closed ends; the lead screw 1 The left end of the guide screw 12 is mounted on the axial motion mounting seat 9 through a bearing and is fixedly connected to the rotor of the axial motor 10. The right end of the guide screw 12 is mounted on the end cover 15 through a pair of bearings, so that the guide screw 12 rotates relative to the axial motion mounting seat 9 and the end cover 15 under the drive of the axial motor 10. A slider 13 is sleeved on the guide shaft 11, and a threaded hole matching the guide screw 12 is processed on the slider 13. The guide screw 12 is rotated to drive the slider 13 to move forward and backward along the guide shaft 11. A probe assembly 14 is fixed on the slider 13. The circumferential motor 8 is coaxial with the center of the main pipeline of the pressure vessel, so that the inspection tool 3 can drive the probe assembly 14 to move circumferentially and axially along the inner wall of the main pipeline of the pressure vessel to complete the non-destructive inspection of the double-layer casing.

[0021] The specific working process of the floating nuclear power plant pressure vessel double-layer casing inspection device described in the present invention is as follows: after the onshore debugging of the inspection device is completed, the entire inspection device is hoisted into the water pool of the pressure vessel by a hoist. In conjunction with the underwater camera, the floating device body 1 is controlled to swim in the pressure vessel, and the inspection tool 3 is inserted into the main pipeline of the pressure vessel, while ensuring that the circumferential motor (8) is coaxial with the center of the main pipeline of the pressure vessel. Then, the inspection device is clamped on the upper partition of the pressure vessel by the fixing component 2 to complete the fixing of the inspection device. The circumferential motor 8 and the axial motor 10 of the inspection tool 3 are controlled to make the probe assembly 14 move circumferentially and axially along the inner wall of the main pipeline of the pressure vessel to complete the non-destructive inspection of the double-layer casing. After the inspection is completed, the fixing component 2 is loosened, the floating device body 1 is controlled to swim and hoist the entire inspection device to the installation position, and the inspection device is hoisted out of the pressure vessel by a hoist to complete the entire inspection.

Claims

1. A double-layer casing inspection device for a floating nuclear power plant pressure vessel, characterized in that: The device comprises a floating device body (1), a fixing component (2) and an inspection tool (3), wherein the floating device body (1) can swim in a pressure vessel, and a strip-shaped inspection tool (3) provided at the lower end of the floating device body (1) is inserted into the main pipe of the pressure vessel, and the entire inspection device is clamped and fixed on the upper partition of the pressure vessel by using the fixing component (2) on the floating device body (1); the inspection tool (3) can move circumferentially along the central axis of the main pipe of the pressure vessel, and drive the probe assembly (14) in the inspection tool (3) to move along the axis of the main pipe; the inspection tool (3) ) comprises an inspection tool mounting seat (7), a circumferential motor (8), an axial motion mounting seat (9) and a probe assembly (14), wherein the upper portion of the inspection tool mounting seat (7) is mounted on the lower end of the floating device body (1), the other end of the inspection tool mounting seat (7) is connected to one end of the rod-shaped axial motion mounting seat (9) through a bearing, a circumferential motor (8) is fixedly provided on the side of the inspection tool mounting seat (7), the rotor of the circumferential motor (8) is connected to the axial motion mounting seat (9), and the circumferential motor (8) can drive the axial motion mounting seat (9) to move circumferentially; in the axial motion A slide rail is provided at the other end of the mounting seat (9), and a probe assembly (14) is provided on the slide rail; the inspection tool (3) further comprises an axial motor (10), a guide shaft (11) and a lead screw (12), wherein the axial motor (10) is arranged on the side of the other end of the axial motion mounting seat (9) away from the inspection tool mounting seat (7); a slide rail is provided on the other side of the axial motion mounting seat (9), and the slide rail comprises a guide shaft (11) and a lead screw (12), wherein the guide shaft (11) is fixedly connected to the axial motion mounting seat (9), and the lead screw (12) is connected to the rotor of the axial motor (10). , the lead screw (12) is driven to rotate by the axial motor (10), which can drive the slider (13) sleeved on the guide shaft (11) to move forward and backward along the guide shaft (11); the axial motion mounting seat (9) is provided with two mutually parallel guide shafts (11), one end of the guide shaft (11) is fixedly connected to the axial motion mounting seat (9), and the other end is connected to the end cover (15), forming a sliding track with closed ends; the fixed component (2) includes a frame (4), a floating block (5) and a clamp (6), wherein a floating block (5) is provided inside the shell structure of the frame (4) to provide buoyancy for the entire inspection device.

2. A double-layer casing inspection device for a floating nuclear power plant pressure vessel according to claim 1, characterized in that: The probe assembly (14) can move axially along the slide rail.

3. A double-layer casing inspection device for a floating nuclear power plant pressure vessel according to claim 2, characterized in that: The probe assembly (14) is arranged on the slider (13).

4. A double-layer casing inspection device for a floating nuclear power plant pressure vessel according to claim 1, characterized in that: The left end of the lead screw (12) is arranged on the axial motion mounting seat (9) through a bearing and is fixed to the rotor of the axial motor (10). The right end of the lead screw (12) is arranged on the end cover (15) through a pair of bearings, so that the lead screw (12) can rotate relative to the axial motion mounting seat (9) and the end cover (15). A slider (13) is sleeved on the guide shaft (11), and a threaded hole matching the lead screw (12) is processed on the slider (13). The lead screw (12) rotates to drive the slider (13) to move forward and backward along the guide shaft (11).

5. The double-layer casing inspection device for a floating nuclear power plant pressure vessel according to claim 1 is characterized in that: A clamp (6) is provided on the frame (4), and the clamp (6) matches the structure of the upper partition of the pressure vessel. The entire inspection device can be fixed by clamping the clamp (6) on the upper partition.

6. The double-layer casing inspection device for a floating nuclear power plant pressure vessel according to claim 1 is characterized by: The center of rotation of the circumferential rotational motion of the inspection tool (3) is concentric with the center of the main pipeline of the pressure vessel; and the axis of the slide rail is consistent with the axis of the main pipeline.

Images