Single-drive dual-parallelogram hoisting mechanism

Abstract

The invention discloses a single-drive dual-parallelogram hoisting mechanism which comprises a fixed base, a lower parallelogram assembly, an upper parallelogram assembly and a coupling mechanism assembly. The single-drive dual-parallelogram hoisting mechanism is used for hoisting examining equipment for the inner wall of a top cover of a reactor pressure vessel of a nuclear power station. The single-drive dual-parallelogram hoisting mechanism can vertically hoist a hoisting platform through the lower parallelogram assembly and the upper parallelogram assembly which are coupled together, avoids horizontal movement and prevents penetrating parts of the top cover from being damaged by the examining equipment. The single-drive dual-parallelogram hoisting mechanism is small in folded size and large in hoisting range, and workers and equipment can conveniently enter and exit through a biosphere man hole. By means of dual-parallelogram restrained-coupling single-drive control, moving shafts of equipment are reduced, the equipment is simpler to control, and the size and the weight of the equipment are reduced.

Description

technical field [0001] The invention relates to the field of nuclear power non-destructive testing equipment, in particular to a single-drive double parallelogram lifting mechanism. Background technique [0002] The reactor pressure vessel of a nuclear power plant is the core equipment of a nuclear reactor, consisting of a vessel body and a top cover. The reactor pressure vessel fixes and contains the core and internal components, so that the fission reaction of nuclear fuel is limited to a sealed space. It forms the pressure boundary of the high-pressure coolant together with the steam generator, the pressurizer and the primary circuit pipeline. One of the three barriers to prevent the escape of radioactive materials. In order to ensure the safe operation of nuclear power plants, American ASME codes, French RSEM codes, and my country's nuclear safety guidelines all clearly require pre-service and in-service inspections of the first-level equipment of this nuclear power p...

AI Technical Summary

Problems solved by technology

[0003] Patent No. 200810107244.4 is an invention patent whose lifting device realizes the lifting and folding of the inspection device through the linear axis of the sliding arm of the inspection equipment and the rotating shaft connected to the rotating arm. Its structure is complex, its volume and weight are relatively Large, short stroke, low reachable height of the inspection device, and uncoordinated movements easily cause the center of gravity to shift, and the safety factor during inspection is low

[0004] Patent No. 98106435.3 discloses a lifting device with a hinged double parallelogram support arm device, but its driving force comes from the hydraulic cylinder between the upper and lower parallelogram support arms. The hydraulic cylinder is limited by its own size and stroke. Restrictions, the upper and lower parallelogram support arms cannot be fully expanded to a vertical state or retracted to a horizontal state, which limits the folding size and lifting range of the lifting mechanism

In addition, it is difficult for this device to achieve high-precision control like a servo system

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