SAFETY BRAKING SYSTEM FOR CAR GUIDE RAIL OF DRAGGING ELEVATOR

摘要

Provided is a safety braking system for a car guide rail of dragging an elevator. The safety braking system comprises: a speed governor, provided with a driving and a driven shaft (2, 3); and a safety gear, comprising a base (4), a gear body (5) and an elastic positioning device, wherein the speed governor is associated with the safety gear; a stopping block (51) is arranged on the gear body (5); left and right inner wedge blocks (6) are arranged in the gear body (5); outer wedge blocks (7) are arranged on outer sides of the inner wedge blocks (6); a limiting mechanism for limiting positions of the inner and outer wedge blocks (6, 7) is arranged on the base (4); the elastic positioning device enables larger ends of the inner and outer wedge blocks (6, 7) to be far away from each other in an up-down direction; and the limiting mechanism limits the inner and outer wedge blocks (6, 7) at an initial position in the up-down direction. When the rotation speed of the driving shaft (2) reaches a rated speed, the driving shaft (2) is connected to the driven shaft (3) via a centrifugal clutch structure, thus driving the movement of the gear body (5); and the stopping block (51) on the gear body (5) enables the larger ends of the inner and outer wedge blocks (6, 7) to get close to each other, thus the two inner wedge blocks (6) get close to each other to enter a brake state, so that bidirectional progressive brake can be realized for the car, thereby ensuring the car to have relatively high security.