Anti-drop bucket for shaft sinking

The utility model discloses an anti-drop suspension bucket used for drilling a vertical well. The anti-drop suspension bucket is provided with a suspension bucket drop preventing system to prevent the suspension bucket from dropping when a lifting rope ruptures, and comprises a lifting rope protecting device, a drop signal pick-up device, a ruptured rope catching device and an automatic control device; wherein the lifting rope protecting device comprises a protecting liftinglug, a protecting rope and a connecting piece; the drop signal pick-up device is a speed sensor whose turnplate is installed on a sliding carriage, and the outer circle of the turnplate is tangent with a stabilizing rope; the ruptured rope catching device includes a stabilizing rope catcher and a spring energy accumulator; the stabilizing rope catcher comprises a fixing sleeve and an elastic taper pipe; the elastic energy accumulator comprises a wane and an energy storing spring; and the automatic control device comprises a signal processing module(1), a second signal processing module(2), a journey controller and a plurality of brake cables. Once the lifting rope ruptures, the sliding carriage and the suspension bucket drop rapidly under the action of gravity, and when the falling speed reaches the set value, the stabilizing rope catcher firmly catches the stabilizing rope, thus reaching the purpose of preventing the drop of the suspension bucket and avoiding incidents caused by the drop of the suspension bucket.