A Fuel Rod Replacement Manipulator Based on Distortion Energy Density Theory

Abstract

The invention discloses a manipulator for replacing a fuel rod. The manipulator comprises a core rod, an elastic clamping jaw and a locking sleeve, wherein the core rod is used for sensing the position of the fuel rod; the elastic clamping jaw is provided with a plurality of clamping jaws and can move axially relative to the locking sleeve, so that the clamping jaws are positioned on the periphery of the fuel rod and can clamp the fuel rod, and accordingly grasping of a nuclear fuel rod is realized; the curvature of the outer side curved surface, in contact with the inner wall of the locking sleeve, of each clamping jaw is the same as that of the inner wall curved surface of the locking sleeve, and the outer side curved surface of each clamping jaw is parallel to the axis of the elastic clamping jaw when the clamping jaws are clamped; the curvature of the claw point curved surface, in contact with the fuel rod, of each clamping claw is smaller than that of the neck curved surface of the fuel rod, and the claw point curved surface of each clamping jaw is parallel to the axis of the elastic clamping jaw when the clamping jaws are clamped. The manipulator is smart in structure, so that the manipulator is higher in reliability when the fuel rod is grasped, and the fatigue resistance property is better; relative movement of the locking sleeve, the elastic clamping jaw and the core rod is controlled through other actuating mechanisms, so that the grasping for the fuel rod is realized.

Description

technical field [0001] The invention belongs to the field of manipulators and relates to a manipulator for replacing fuel rods. The manipulator has higher reliability and anti-fatigue characteristics when replacing fuel rods. Background technique [0002] In order to improve the utilization rate of fuel assemblies and the economical efficiency of power plants, for the irradiated fuel assemblies whose components are damaged but have not reached the maximum burnup, on the premise of ensuring the safety of fuel assemblies and cores, it can be considered to repair and re-enter the reactor for use , Pulling out or inserting fuel rods from damaged components is an important part of fuel component repair equipment. The nuclear fuel gripper is the core actuator that directly contacts the nuclear fuel assembly during the first charging of the nuclear reactor and the overhaul period. It is the core component of the entire set of nuclear fuel handling and storage system equipment. The ...

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Problems solved by technology

[0003] U.S. Patent No. 4,903,281 discloses an elastic chuck for grabbing fuel rods, but the disadvantage of the elastic chuck is that when the power is cut off, the jacket loses power and falls, which will cause the fuel rods to come out of the jaws, and the reliability is low. , not safe

[0004] Chinese patent application 94193513.2 discloses a fuel rod assembly loading device, which includes a fuel rod clamping device, but the disadvantage of this device is that the locking of the elastic chuck to the fuel rod is completely dependent on the outer tube Clamping, this kind of clamping device is not reliable enough and not safe enough when clamping fuel rods

[0006] The collet device does not completely rely on the outer tube to lock, so that the reliability and safety are greatly improved. In the contact and clamping surface of the rod, the traditional structure is still used, so that in the process of grabbing or clamping the fuel rod, its reliability is still not high enough, and the fatigue resistance is poor

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