Fuel assembly grab using wedge to realize self-locking

Abstract

The invention relates to a fuel assembly grab using a wedge to realize self-locking. The grab comprises a grab flange, a grabbing hook bearer, a grabbing hook, a pin shaft, a driving sleeve, a grab guiding column, a sliding sleeve, a wedge, screws and springs. The grabbing hook is installed on the grabbing hook bearer through the pin shaft, the grabbing hook is connected with the driving sleeve, the upper portion of the driving sleeve is connected with the driving mechanism of the grab, and the driving mechanism drives the driving sleeve to lift in order to realize the release and engagement of the grabbing hook; and a compression gap is residual between the top of the grab guiding column and the gap flange, the grab guiding column is connected with the sliding sleeve, the side surface of the sliding sleeve is provided with the wedge, the sliding sleeve is guided by the screws arranged on the bottom surface of the grab flange, the springs cover the screws, and he springs are connected with the sliding sleeve and the grab flange respectively. The grab realizes self-locking depended on the compacting force of the springs and the cooperative contact of the wedge with the grabbing hook, has the advantages of simple and compact structure and safe and reliable operation, and can effectively meet the technological demands of fuel operation of nuclear power plants.

Description

technical field [0001] The invention belongs to a grasping device, in particular to a fuel assembly grasper adopting self-locking wedge blocks, which can be used for loading and unloading machines of nuclear power plants. Background technique [0002] The nuclear power plant loading and unloading machine is used for unloading and unloading the fuel assembly when the nuclear power plant reactor is firstly loaded or shut down for refueling, and transports the fuel assembly between the core and the transfer device. The fuel assembly grab is an important part of the loading and unloading machine. It is located at the lower end of the telescopic sleeve of the loading and unloading machine, and plays the role of grabbing and releasing fuel assemblies. [0003] The operation of the fuel assembly needs to be carried out at a depth of about 12 meters, and the distance between the fuel assemblies is only 1mm, and there is still a certain amount of bending deformation after burning up,...

AI Technical Summary

Problems solved by technology

Existing fuel assembly grippers generally use interlocking plates and interlocking roller structures for self-locking, such as Chinese patent application 200810181000.0, "Mechanical Self-locking Fuel Assembly Grab", this type of gripper structure has a long self-locking stroke and zero There are many parts and complex structure, the volume and weight of the gripper itself are relatively large, and the actual operation effect is not ideal

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