Device intended to impart a linear motion, of the type comprising grasping members with adjustable travel, and apparatus endowed with such a device for lowering and raising a drive rod for control rods in a nuclear reactor

摘要

This device comprises a set of movable annular polar components 35, 37, 39 at a distance along a linear component 1 contiguous with a stationary polar component 27. The gaps between the polar components are held open by springs. Separated thrust coils 19, 17, 15 close each gap when they are brought into action. A set of movable grasping members 53 mounted on the movable polar component furthest away from the stationary polar component can be brought into action to engage its teeth into the linear component. An actuating means 21 can selectively move the linear component forward either by one gap thickness at each step, bringing the thrust coils into action one by one according to a lengthwise sequence, or by a length equal to the sum of the gap thicknesses, bringing all the thrust coils into action practically simultaneously. Applications: especially in nuclear reactors. IMAGE