Tail spring device of drum vacuum valve

Abstract

The invention belongs to a uranium hexafluoride system in the field of uranium enrichment, and particularly relates to a tail spring device applied to a drum vacuum valve in the system. The tail spring device comprises a worm shaft, a nut assembly, a spring assembly and a sleeve assembly, wherein the sleeve assembly is connected to an external system through bolts; when a valve does switch-on and switch-off actions, a motor drives the worm shaft to rotate, the nut assembly linearly slides to a spring base to compress a spring through the action of a U-shaped groove of the sleeve assembly, the spring transmits force borne by the spring to the base, and the force is exerted on the worm shaft through a half gasket; counterforce generated through spring compression hinders rotation of the worm shaft, the friction force of the worm shaft is increased, and then the moment transmitted by the worm shaft is decreased. According to the tail spring device, the compressing force of the spring is borne by the worm shaft, the sleeve assembly does not bear the elastic force any more, therefore, the service life of a sleeve is prolonged, and the reliability of the valve is improved.

Description

technical field

[0001] The invention belongs to a uranium hexafluoride system in the field of uranium enrichment, and in particular relates to a tail spring device applied to a drum vacuum valve in the system. Background technique

[0002] Drum vacuum valve is an important equipment in uranium enrichment system. The characteristic of this kind of valve closing action is that the driving mechanism drives the valve core assembly to rotate 90° and then stops the rotation, and then pushes the closing disc in the valve core assembly to go straight to the valve port to achieve channel sealing. When the spool assembly rotates 90° driven by the main shaft, the spool assembly hits the thrust head and stops rotating; when the main shaft continues to rotate, the closing disk in the spool assembly goes straight under the track of the cam, and finally presses the sealing surface. In the process of hitting the thrust head and pressing the sealing surface, there will be an impact. The fun...

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