Control rod drive mechanism and its connection with control rods

Abstract

The invention discloses a control rod driving mechanism which comprises a machine seat, a motor, a transmission rod, a hollow shaft, an ejector rod and at least three grippers, wherein the hollow shaft is fixedly connected with the machine seat; the inner wall of the hollow shaft is provided with a thread area; the side wall of the ejector rod is provided with an external thread; the ejector rod is contained in the hollow shaft and is in threaded matched with the thread area; the motor is fixed on the machine seat and is used for driving the transmission rod to rotate; the lower end of the transmission rod extends into the hollow shaft and is connected with the ejector rod in a way of circumferential location; the grippers are pivoted on the side wall of the hollow shaft; a blocking hook surface which extends towards the central axis of the hollow shaft and is inclined downwards is formed on the lower end of each gripper; the upper ends of the grippers are pushed downwards by the ejector rod, and the blocking hook surfaces of the at least three grippers are driven to clamp a control rod together. The assembly and disassembly of the control rod driving mechanism and the control rod are convenient and fast, and the risk of releasing of the control rod can be effectively reduced. Correspondingly, the invention also provides a connecting way of the control rod driving mechanism and the control rod.

Description

technical field [0001] The invention belongs to the technical field of control rod driving mechanisms, in particular to a control rod driving mechanism capable of preventing accidental tripping. Background technique [0002] The start-stop and power control of the nuclear reactor core are all realized by the control rod drive mechanism driving the control rods to move up and down into and out of the core, and the control rod drive mechanism and the control rods are connected by a certain structure. When a normal shutdown is required, the control rod drive mechanism gradually inserts the control rods into the fuel assemblies to stop the chain reaction; when an emergency shutdown is required, the control rod drive mechanism is disconnected from the control rods, and the control rods are quickly inserted into the fuel assemblies by their own gravity. [0003] like figure 1 As shown in , the upper end of the control rod 1 is formed with an upper gripping head 11 and a lower gri...

AI Technical Summary

Problems solved by technology

However, when there is an unexpected working condition, such as a large impact load, the upper end of the control rod will squeeze the end and move upward. In severe cases, the control rod may be disengaged from the end of the detachable joint, resulting in accidental tripping

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