A pressure vessel ultrasonic inspection platform transfer and debugging device

Abstract

The present invention belongs to the technical field of non-destructive testing of reactor pressure vessels, and specifically relates to a pressure vessel ultrasonic inspection platform transfer and debugging device. The base plate is fixed in a frame, and four legless lower platform cross legs are connected to the legless lower platform four joints. The legless lower platform support rods are arranged on the base plate to support the legless lower platform cross legs. Column 1, column 2, and column 3 are fixed to the base plate through upper column fixing rings; the upper platform support rods are arranged on the base plate to support the upper platform cross legs. The three upper platform cross legs are connected to the upper platform three joints; the legged lower platform four joints are connected to four legged lower platform cross legs. The legged lower platform cross legs are connected and fixed to the legged lower platform longitudinal legs through vertical support circular hoops. Support legs are arranged under the legged lower platform longitudinal legs; vertical supports are arranged under the legged lower platform cross legs, and secondary beams and main beams are connected between the vertical supports. The present invention saves labor costs and improves the efficiency of nuclear reactor pressure vessel maintenance work.

Description

Technical Field

[0001] The invention belongs to the technical field of nondestructive testing of reactor pressure vessels, and in particular relates to a pressure vessel ultrasonic inspection platform transport and debugging device. Background Art

[0002] The safety and reliability of nuclear power plants are of great significance to national security. The reactor pressure vessel is the most core and critical component of a nuclear power plant. Designated nuclear safety components must be fully or partially inspected in strict accordance with regulations and procedures, and the performance of the pressure vessel must be regularly evaluated to ensure the safe and stable operation of the nuclear power plant.

[0003] The reactor pressure vessel operates in a complex and harsh environment. The entire inspection process involves complete immersion in coolant, resulting in high radioactivity and human proximity. Therefore, inspections must be performed using remotely controlled nondestructive testing robots. Currently, there are two types of nuclear reactor inspection robots, both domestically and internationally: fixed tripod-based systems, such as the internationally recognized TIME robot introduced by China General Nuclear Power Corporation (CGN), and mobile systems, such as the SUPREEM robot developed by CNNC Wuhan Nuclear Power Operation Technology Co., Ltd., which is easy to assemble and offers modular scanning capabilities.

[0004] In-service inspections of reactor pressure vessels present many problems, such as numerous inspection items, heavy tasks, and tight timelines. Especially during the ten- or twenty-year overhaul period of a nuclear power plant, stricter requirements are placed on the efficiency, safety, and environmental protection of pressure vessel inspections. Therefore, existing mechanical equipment is optimized and upgraded to reduce time costs and meet the overhaul requirements of nuclear power plants.

[0005] Ultrasonic scanning, one of the primary methods for inspecting pressure vessel welds, offers significant advantages in versatility and efficiency. However, the complex and specialized structure of ultrasonic inspection equipment for nuclear reactor pressure vessels requires frequent disassembly and assembly during transfer, commissioning, and submerged inspections, impacting inspection progress and resulting in wasted manpower and time. Furthermore, nuclear reactor pressure vessel inspections overlap with other in-service inspections. Therefore, efficiently and safely completing the transfer, commissioning, and submerged inspections of ultrasonic inspection equipment while fully utilizing nuclear power plant resources remains a pressing challenge for nuclear reactor pressure vessel inspections. Summary of the Invention

[0006] The purpose of the present invention is to provide a pressure vessel ultrasonic inspection platform transportation and debugging device, which shortens the transportation, disassembly, debugging and underwater inspection time of ultrasonic equipment, saves labor costs and improves the efficiency of nuclear reactor pressure vessel maintenance.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A pressure vessel ultrasonic inspection platform transfer and debugging device, wherein the base plate is fixed in the frame, the four legless lower platform transverse legs are connected to the legless lower platform four joints, the legless lower platform support rods are arranged on the base plate, used for supporting the legless lower platform transverse legs, column-1, column-2, and column-3 are fixed to the base plate through upper column fixing rings; the upper platform support rods are arranged on the base plate, used for supporting the upper platform transverse legs, and the three upper platform transverse legs are connected to the upper platform three joints; the legged lower platform four joints are connected to the four legged lower platform transverse legs, the legged lower platform transverse legs are connected and fixed to the legged lower platform longitudinal legs through vertical support circular hoops, and support legs are arranged under the legged lower platform longitudinal legs; vertical supports are arranged under the legged lower platform transverse legs, and secondary beams and main beams are connected between the vertical supports.

[0009] The base plate is bolted into the grooves in the frame.

[0010] The four horizontal legs of the legless lower platform are connected to the four joints of the legless lower platform by bolts in a prescribed sequence.

[0011] A cylinder driving mechanism under the platform is arranged under the four joints of the leg lower platform.

[0012] The sizes of main beam and secondary beam can be changed to suit different pile types.

[0013] The beneficial effects achieved by the present invention are:

[0014] The platform transfer device is designed to conveniently accommodate the legless lower platform, upper platform, and columns of various sizes. When the nuclear reactor pressure vessel inspection begins, the legless lower platform is simply deployed using a crane. Once the pressure vessel inspection is complete, the platform can be folded and secured to the transfer device by loosening the bolts. This eliminates the need for disassembly and assembly of the cross legs, saving approximately 15 hours.

[0015] The designed platform debugging device is conducive to improving the functionality of the legged platform. It not only saves the equipment launching and lifting inspection cycle, but also reduces the contact time with nuclear radiation contaminated equipment, reducing the harm to personnel from nuclear radiation contaminated equipment.

[0016] Nuclear reactor pressure vessel inspections are time-sensitive, demanding, and risk-intensive. A specially designed platform transfer device effectively saves time, reduces workload, and mitigates risk. Equipment commissioning and disassembly are scheduled before the inspection begins and located in the AC plant. The entire platform transfer device functions as a dedicated ultrasonic inspection equipment warehouse, significantly improving equipment accessibility, saving labor costs, and offering innovative and optimized management. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a diagram of the platform and column transfer device;

[0018] Figure 2 This is a diagram of the debugging device for the platform under the legs.

[0019] In the figure, 1 is the base plate; 2 is the frame; 3 is the support rod of the legless lower platform; 4 is the horizontal leg of the legless lower platform; 5 is the four-joint of the legless lower platform; 6 is the column-1; 7 is the column-2; 8 is the column-3; 9 is the three-joint of the upper platform; 10 is the horizontal leg of the upper platform; 11 is the support rod of the upper platform; 12 is the fixing ring of the upper column; 13 is the support leg; 14 is the longitudinal leg of the legged lower platform; 15 is the vertical support; 16 is the vertical support hoop; 17 is the horizontal leg of the legged lower platform; 18 is the four-joint of the legged lower platform; 19 is the cylinder drive mechanism under the platform; 20 is the secondary beam; 21 is the main beam. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] In view of the structural characteristics of pressure vessel ultrasonic inspection equipment and its shortcomings during transfer and commissioning, a pressure vessel ultrasonic inspection platform commissioning device was proposed. Since the axial scanning range of nuclear reactor pressure vessels during inspection is too large, namely, ultrasonic inspection is required from the bottom seam head to the flange surface. Therefore, the SUPREEM robotic arm must be fixed to the upper platform and the legged lower platform for inspection. During the inspection and commissioning phase of nuclear reactor pressure vessels, all equipment must be transported to the commissioning site for assembly and commissioning. For the platform, the upper platform and the legged lower platform must be assembled according to requirements during commissioning. During the transfer phase, the platform, its columns, and legs can be directly installed on the platform commissioning device. Therefore, the separate design of the platform transfer device and the platform commissioning device can significantly save time and labor costs, shorten the ultrasonic inspection period, and reduce the workload.

[0022] The key points and points to be protected of the present invention are: the transfer device of the present invention can directly install the reactor pressure vessel ultrasonic equipment platform and the platform columns and legs on the device, which is convenient for its overall transportation; the debugging device of the present invention can assemble the upper platform and the lower platform with legs in advance according to requirements, saving the equipment debugging cycle.

[0023] Pressure vessel ultrasonic inspection platform and column transfer device see Figure 1 As shown, there is a debugging device for the platform under the legs. Figure 2 shown.

[0024] The pressure vessel ultrasonic inspection platform and column transfer device are mainly composed of shelf components, legless lower platform components, upper platform components, platform support rod components, and columns.

[0025] 1) Rack Assembly: The rack assembly primarily consists of a base plate 1 and a frame 2. Prior to the start of nuclear reactor pressure vessel inspections, the transfer rack is pre-assembled in the AC plant. Base plate 1 is crane-mounted into the grooves designed for frame 2 and secured with bolts.

[0026] 2) Legless lower platform components: The legless lower platform components primarily consist of the legless lower platform cross legs 4 and the legless lower platform four-joint 5. When commissioning the pressure vessel ultrasonic inspection equipment in the AC plant, the legless lower platform must be pre-assembled. The four legless lower platform cross legs 4 must be bolted to the legless lower platform four-joint 5 in the prescribed sequence.

[0027] 3) Upper platform components: The upper platform components are mainly composed of the upper platform three-joint 9 and the upper platform cross legs 10. Similar to the legless lower platform components, they are pre-assembled in the AC workshop.

[0028] 4) Platform support rod components: The platform support rod components refer to the legless lower platform support rod 3 and the upper platform support rod 11. Due to the different structures of the upper and lower platforms, specific platform support rod components are designed to support each platform.

[0029] 5) Columns: When performing ultrasonic inspections on pressure vessels, different types of columns are designed for different reactor types to meet the scanning range during ultrasonic inspection. This platform transfer device reserves four upper column fixing rings 12 for storing columns.

[0030] The pressure vessel ultrasonic inspection platform debugging device is mainly composed of a platform support frame component, a legged lower platform component, and a cylinder driving mechanism under the platform.

[0031] 1) Platform support frame components: The platform support frame components primarily consist of secondary beams 20, main beams 21, vertical supports 15, and vertical support hoops 16. Prior to pressure vessel inspection, the platform support frame components are pre-assembled in the AC plant. The platform components under the legs are secured by vertical support hoops 16. By varying the dimensions of the main and secondary beams, the platform can be adapted to different reactor types, such as CP600 and M310.

[0032] 2) Legbed platform components: The legbed platform components mainly consist of support legs 13, legbed platform longitudinal legs 14, legbed platform transverse legs 17, and legged platform four-joints 18. They are pre-assembled in the AC workshop to save time for pressure vessel inspection.

[0033] 3) Cylinder drive mechanism under the platform: used to allow the robotic arm to hang down for scanning.

[0034] The base plate 1 is fixed to the groove of the frame 2 with bolts. The four legless lower platform cross legs 4 are respectively connected to the legless lower platform four joints 5 by bolts in the prescribed order. The legless lower platform support rod 3 is set on the base plate 1 to support the legless lower platform cross legs 4. The column-1, column-2, and column-3 are fixed to the base plate 1 through the upper column fixing ring 12; the upper platform support rod 11 is set on the base plate 1 to support the upper platform cross legs 10. The three upper platform cross legs 10 are connected to the upper platform three joints 9.

[0035] The four joints 18 of the legged lower platform are connected to four legged lower platform transverse legs 17, and the legged lower platform transverse legs 17 are connected and fixed to the legged lower platform longitudinal legs 14 through vertical support circular hoops 16. Support legs 13 are arranged under the legged lower platform longitudinal legs 14; vertical supports 15 are arranged under the legged lower platform transverse legs 17; a lower platform cylinder drive mechanism 19 is arranged under the four joints 18 of the legged lower platform, and secondary beams 20 and main beams 21 are connected between the vertical supports 15.

Claims

1. A pressure vessel ultrasonic inspection platform transfer and debugging device, characterized by: The base plate is fixed in the frame, the four legless lower platform transverse legs are connected to the four joints of the legless lower platform, the legless lower platform support rod is arranged on the base plate, for supporting the legless lower platform transverse legs, and the column-1, column-2, and column-3 are fixed to the base plate through the upper column fixing ring; the upper platform support rod is arranged on the base plate, for supporting the upper platform transverse legs, and the three upper platform transverse legs are connected to the upper platform three joints; the four joints of the legged lower platform are connected with four legged lower platform transverse legs, and the legged lower platform transverse legs are connected and fixed to the legged lower platform longitudinal legs through vertical support circular hoops, and support legs are arranged under the legged lower platform longitudinal legs; vertical supports are arranged under the legged lower platform transverse legs, and secondary beams and main beams are connected between the vertical supports; a lower platform cylinder drive mechanism is arranged under the four joints of the legged lower platform.

2. The pressure vessel ultrasonic inspection platform transport and debugging device according to claim 1, characterized in that: The base plate is bolted into the grooves in the frame.

3. The pressure vessel ultrasonic inspection platform transfer and debugging device according to claim 1, characterized in that: The four horizontal legs of the legless lower platform are connected to the four joints of the legless lower platform by bolts in a prescribed sequence.

4. The pressure vessel ultrasonic inspection platform transfer and debugging device according to claim 1, characterized in that: The sizes of main beam and secondary beam can be changed to suit different pile types.

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