Traction sheave safety device and elevator car emergency stop method thereof

Abstract

A traction sheave safety device and elevator car emergency stop method includes a first brake block of a first brake rubber, a second brake block mounted with a second brake rubber and a mounting base for mounting the first and second brake blocks. It uses a first and the second brake rubbers disposed on the two sides of the traction sheave. The second brake rubber is movable along a direction slanted with respect to an axis of rotation of the traction sheave. A brake block actuation member is triggered by the brake blocks to enable the first and the second brake rubbers to hold the traction sheave. A switching member is also triggered by the action of the second brake rubber, for cutting off a safety circuit of the elevator when the elevator car is in abnormal operation. When abnormal operation of the elevator car is detected by the elevator system, the external power is cut off, the brake block actuation member enables contact between the second brake rubber and the traction sheave to generate a normal pressure. The traction sheave continues to rotate and drives the second brake rubber triggering the brake block members to generate enough frictional braking force to stop the traction sheave. The switching member is triggered upon the movement of the second brake rubber, and cuts off the safety circuit of the elevator. The safety device is kept at an emergency braking state until the braking state is manually released. The frictional braking force generated by the device can be automatically regulated according to the rotating speed of the traction sheave. Thus, injuring accidents caused by excessive deceleration in an emergency braking are avoided, and the entire device has an excellent overall performance.

Dependencies are inferred from the claim text.