Machine-room-less speed limiter for elevator

Abstract

The invention relates to a machine-room-less speed limiter for an elevator, which comprises a frame; a limit switch, a brake mechanism, a steel rope wheel and a ratchet which are arranged on the frame; a centrifugal mechanism and a rotatable pawl which are arranged on the steel rope wheel; an anti-back head fork which is clamped against the tail end of the pawl; and a reset shaft pin and a spring, wherein the ratchet is in transmission connection with the brake mechanism; the centrifugal mechanism comprises an upper centrifugal piece, a lower centrifugal piece, two centrifugal hammer shafts, a connecting rod and a compression spring, and centrifugal heavy hammers are arranged at the front parts of the upper centrifugal piece and the lower centrifugal piece; the anti-back head fork is fixed on the steel rope wheel through a torsion spring, a transmission part which is in contact with the upper centrifugal piece is arranged on the anti-back head fork, and a circular arc hole is formed at the back part of the upper centrifugal piece; and one end of the reset shaft pin penetrates the circular arc hole and is fixed with the head end of the pawl, and the spring is tensed between the reset shaft pin and a wheel hub of the steel rope wheel. The machine-room-less speed limiter for the elevator has the advantages of safety, reliability and a wide range of applications.

Description

technical field [0001] The invention relates to an elevator speed governor, in particular to a machine-roomless speed governor for an elevator. Background technique [0002] At present, the machine room-less speed limiter commonly used in the elevator market adopts such as figure 1 The working principle of the mechanism shown is: when the speed gradually increases and is about to reach the rated speed of the elevator brake, the centrifugal system of the cable pulley makes the pawl 4 gradually approach the ratchet 3; when the pawl 4 approaches to a certain extent, insert The ratchet 3 and the brake mechanism 1 clamp the elevator steel rope 18 to obtain the required lifting force to brake the elevator, and during the jog return process of the traction machine, the pawl 4 automatically resets, and the speed limiter remains Can restore the original state. However, because the ratchet of this mechanism approaches the ratchet gradually when the speed increases, it will generate ...

AI Technical Summary

Problems solved by technology

However, because the pawls of this mechanism gradually approach the ratchet wheel when the speed increases, it will generate a lot of noise before braking, and the ratchet wheel will bear a large impulse, resulting in the possibility of damage to the ratchet wheel.

Therefore, although this type of speed limiter can only be used in elevators below 90 m / min, there is still a great hidden danger of failure of the reset system.

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