Friction locking type magnetic lifter and control method thereof

Abstract

The invention discloses a friction locking type magnetic lifter and a control method thereof. The lifter comprises a sealed casing as well as a drive rod assembly and an armature which are located in the sealed casing, wherein the drive rod assembly comprises a friction rod; an armature accommodating cavity for the armature to axially move along the friction rod conveniently is formed between the drive rod assembly and the sealed casing, a retaining assembly for enabling the friction rod to be closely attached to the sealed casing, a moving assembly for enabling the friction rod to be closely attached to the armature and a lifting assembly for driving the armature to move upwards along the friction rod are arranged on the sealed casing, and each of the retaining assembly, the moving assembly and the lifting assembly comprises a magnetic yoke and a coil winding around the magnetic yoke. The lifter adopting the structure is large in wear allowance and high in rod falling reliability.

Description

technical field [0001] The invention relates to the field of nuclear reactor control rod driving mechanism, in particular to a novel control rod driving mechanism, namely a friction locking type magnetic lifter. Background technique [0002] The control rod drive mechanism is the servo mechanism of the nuclear reactor control and protection system. It needs to lift, insert, hold and release the control rod assembly according to the command, so as to complete the reactor start-up, power adjustment, power maintenance, normal shutdown and safety shutdown. Among the published invention patents are stepping magnetic lift type reactor control rod drive mechanism, fully enclosed movable coil electromagnet control rod drive mechanism, water pressure driven control rod drive mechanism, hybrid linear reluctance motor type control rod Control rod drive mechanism with various principles such as drive mechanism. [0003] At present, the control rod driving mechanism generally relies on ...

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Problems solved by technology

[0003] At present, the control rod driving mechanism generally relies on hooks or other parts with similar functions to lock the driving rod connected to the control rod assembly or other parts with similar functions, and then moves the driving rod up and down through electromagnetic force or water pressure, such as The control rod drive mechanism described in patents CN 101178946A, CN 1256497A, and CN 1442863A needs to rely on the hook to lock the drive rod, so it has high requirements for the wear of moving parts. Once the wear of the hook or other parts is large, it may As a result, the control rod drive mechanism cannot normally lift and insert the control rod assembly, and because the fitting clearance of the parts is small, the moving parts are prone to jamming due to the entry of impurities or other reasons, which may affect the normal drop of the control rod drive mechanism

Patent CN 102956274A is based on the principle of linear reluctance motor. Although it directly converts electric energy into linear electromagnetic thrust to drive the mover assembly connected to the control rod assembly to move up and down, but due to the high guiding requirements for the mover assembly to reduce The magnetic bias pull force, the guide gap between the mover assembly and the sealing shell is small, correspondingly, there are high requirements for the wear of moving parts, and it is also easy to cause sticking due to impurities or other reasons.

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