System for promoting article along path, comprising: head component Dispatch component And the casing that turns up, the casing that turns up is configured with exterior portion, turn up part and inboard portion, exterior portion is configured to be slidably coupled to head component with the cannula tip fixed to scheduling component, valgus point is configured to, and inboard portion is configured to be partially toward scheduling component extension from turning up. Inboard portion and exterior portion are configured to form space therebetween, the space promotes fluid in the upper applied force in part of turning up for receiving, to make one section of headward component of inboard portion gradually advance, it shifts it slidably relative to head component and gradually the corresponding section for part of turning up is advanced in exterior portion, so that the casing that turns up be turned over inside-out and head component is made to advance along path. Head component is configured with for keeping turning up part and facilitating the interior section that valgus split-phase slides head component.
