Crane hoist capable of achieving precise centering function

Abstract

The invention belongs to the process field of assembling of reactor core parts of nuclear power plants and in-service detecting hoisting of key parts, and particularly relates to a crane hoist capableof achieving the precise centering function. The crane hoist includes a cross universal joint, a lower hoisting structure and an upper connecting structure; the upper connecting structure is fixed atthe shaft ends of the two opposite sides of a cross shaft 8 through bearing holes 16 in a sided hanging plate 1 on the two opposite sides, and the lower hoisting structure is fixed at the shaft endson the other two opposite sides of the cross shaft 8 through bearing holes 16 in the sided hanging plate 1 on the other two opposite sides. By means of the crane hoist, the problem of the horizontal difference of hoisting items caused by excessive reins or other factors of a crane steel wire rope can be effectively solved, the significance of the engineering reference of the large hoisting machinery is achieved, and the crane hoist capable of achieving the precise centering function of a nuclear power plant is compact in structure and convenient to maintain.

Description

technical field [0001] The invention belongs to the technological field of nuclear power plant reactor core component assembly and in-service inspection and hoisting of key components, and in particular relates to a crane spreader capable of realizing precise centering functions. Background technique [0002] In the hoisting process of reactor core components in nuclear power plants, the requirements for the levelness of the reactor internal protection tube assembly and core basket are extremely high after being hoisted by ring hoisting. For example, the VVER unit ring hoists the transported reactor equipment on the fork of the main hoisting mechanism at any height and the maximum rotation angle of the fork for a diameter of 3600 mm requires that the horizontal height difference not exceed 1 mm. [0003] In order to ensure extremely high safety performance, nuclear power plant ring cranes use high tensile strength steel wire ropes such as 2160N / mm 2 . Due to the high tensi...

AI Technical Summary

Problems solved by technology

Due to the high tensile strength of the steel wire rope, the rein of the steel wire is relatively large. When lifting the reactor core components, the steel wire rope is in an irregular pulling state after being stressed, resulting in the lifting of heavy objects that cannot meet the requirements of high precision.

As a result, reactor equipment such as protective tube assemblies and core baskets cannot be normally dismantled and loaded

If personnel go to the core position to confirm the state of the hoisted internal components, it will take a very long time, and the radiation dose of personnel is extremely high, which will have a great impact

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