Traction sheave safety device and elevator car emergency stop method thereof

A traction sheave safety device, comprising:

• a pair of brake block components, including a first brake block equipped with a first brake rubber and a second brake block equipped with a second brake rubber;
• a mounting base on which the first brake block and the second brake block are mounted, wherein the first brake rubber and the second brake rubber are disposed on the two sides of a traction sheave, and the second brake rubber is movable in an inclined direction with respect to an axis of rotation of the traction sheave;
• a brake block actuation component, mounted on the mounting base, and configured to trigger the brake blocks so that the first brake rubber and the second brake rubber hold the traction sheave;
• and
• a switching component triggered by the movement of the second brake rubber along the oblique direction to the axis of the traction sheave and configured to electrically break a safety circuit of an elevator when an elevator car operates abnormally;
• a bracket connected with the mounting base and configured to fix a safety device entirely below the traction sheave, and the mounting base is movable along the direction of the axis of rotation of the traction sheave with respect to the bracket;
• wherein, the second brake block comprises a wedge block and a brake shoe, a side of the wedge block away from the traction sheave is fixedly mounted on the mounting base, another side of the wedge block close to the traction sheave is mated with the brake shoe;
• an upper side wall and a lower side wall extend from the brake shoe in the longitudinal direction above and below a side of the brake shoe that faces the wedge block, a rolling shaft is pivotally arranged in Amendment and Response to Office Action the middle between the upper side wall and the lower side wall, and the rolling shaft can roll on a side surface of the wedge block that faces the brake shoe, so that the brake shoe moves with respect to the wedge block;
• wherein an elevator system is configured to detect that the elevator car operates abnormally, the elevator system is configured to, in response to a detection that the elevator car operates abnormally:
• cut off a power supply to the elevator system,
• cause the brake block actuation component to push the second brake block after power-off so that the second brake rubber comes into contact with the traction sheave to generate positive pressure, wherein the traction sheave is configured to continue its rotation and drive the second brake rubber to move in the direction inclined to the axis of the traction sheave, and
• trigger the brake block component to generate a frictional braking force to stop the traction sheave, wherein the switching component is configured to be triggered at the moment the second brake rubber moves so as to electrically break the safety circuit of the elevator;
• wherein the safety device is configured to be kept at an emergency braking state until braking components are manually released.