Gradual centrifugal brake

Abstract

The invention relates to a gradual centrifugal brake. The gradual centrifugal brake comprises a rotary shaft and a brake mechanism arranged on the rotary shaft in a sleeving manner; the brake mechanism comprises a throwing block, a brake disc and a guide pipe, the outer wall of the rotary shaft is sleeved with the guide pipe, the front end of the rotary shaft stretches out of the guide pipe to be correspondingly provided with the throwing block, the brake disc is cylindrical, the rear end of the brake disc is assembled on the outer wall of the guide pipe in a thread manner, the front end of the brake disc extends to the position in front of the rotary shaft, the throwing block moves towards the inner wall of the brake disc through the centrifugal effect, and a ratchet corresponding to the throwing block is arranged on the inner wall of the brake disc; the outer wall of the guide pipe is provided with an elastic buffer part colliding with the brake disc; the throwing block is thrown through the centrifugal force, the thrown-out throwing block is engaged with the brake disc, the rotary shaft drives the brake disc to displace along the guide pipe and extrude a buffer spring, the original instant brake manner is changed into the gradual brake manner, the influence and the damage of instant brake to a lift car and a transmission part are reduced, and the discomfort of passengers in an elevator is avoided.

Description

technical field [0001] The invention relates to an elevator braking device, in particular to a progressive centrifugal brake which changes the original instantaneous braking mode into a progressive braking mode. Background technique [0002] In conventional elevators, a motor is rotated by a power converter, and a cable is moved up and down via a pulley connected to the motor, so that a car connected to the cable can be raised and lowered. When a part of the drive system such as the power converter, the motor, and the encoder connected to the motor fails, the elevator will easily fall quickly and endanger people's lives. In order to avoid danger, the existing elevators are generally equipped with a holding brake. The brake is used to hold the elevator car stationary when the car is parked at the lift platform. The same brake is usually also used as an emergency brake. In an emergency, the brake can brake the car as soon as possible to ensure the safety of passengers. This i...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above defects, many elevators use centrifugal brakes instead of drum brakes. The braking criterion of centrifugal brakes is overspeed, which is activated when the elevator has an emergency such as power failure. When the elevator falls at high speed due to the above reasons, the elevator The driving rotary shaft will rotate at a high speed under the gravity of the elevator, and the throwing block will be thrown out with the centrifugal force. After the throwing block is stuck on the brake disc to form a limit, so as to realize emergency braking and avoid the danger of passengers falling due to the elevator , but the existing centrifugal brake is an instantaneous braking method. This form will not only affect and damage the structure of the car and the transmission part of the elevator, but also when the elevator stops, if the passenger is in the car, it will produce serious vibrations, which will cause serious shock to the passengers. bring discomfort

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