Elevator safety tongs with high safety performance

Abstract

The invention provides a pair of elevator safety tongs with a high safety performance. The pair of elevator safety tongs with the high safety performance comprises a tong seat, a U-shaped spring arranged in the tong seat, two groups of oscillating type clamping mechanisms symmetrically arranged in the U-shaped spring, and a lifting mechanism connected onto the two groups of oscillating type clamping mechanisms. An opening for an elevator guide rail to pass through between the two groups of oscillating type clamping mechanisms is formed in the tong seat; and the two groups of oscillating type clamping mechanisms provides an inward pressing force through the U-shaped ring. According to the pair of elevator safety tongs with the high safety performance provided by the invention, a structure that the two groups of oscillating type clamping mechanisms are symmetrically arranged in the tong seat is adopted, so that when major failures such as overspeed and rope breakage occur on an elevator,clamping blocks of the oscillating type clamping mechanisms oscillate upwards relative to guiding blocks so as to clamp the elevator guide rail, the problem that wear is easy to cause due to direct sliding contact of the guiding blocks and wedge-shaped blocks in the prior art is effectively solved, the service life is long, a braking force is transferred to the clamping blocks through oscillatingarms arranged reasonably so as to be effectively ensured to be balanced, clamping surfaces always tightly fit to an outer side surface of the elevator guide rail, and a braking effect is good.

Description

technical field [0001] The invention relates to an elevator safety gear with high safety performance. Background technique [0002] The elevator safety gear is used to stop the car in an emergency and clamp the car on the elevator guide rail when the elevator has serious faults such as overspeed and broken rope. The existing elevator safety gear is mainly composed of a clamp base, a pull rod and a braking mechanism, wherein the clamp base is fixedly connected with the car; the braking mechanism is composed of a U-shaped spring, two wedge blocks and two guide blocks, etc. , the two guide blocks are relatively arranged at the mouth of the U-shaped spring, and the two wedge blocks are relatively arranged between the two guide blocks. The wedge blocks and the guide blocks are matched by wedge surfaces, and there is a gap between the two wedge blocks. The elevator guide rails pass through this gap: the tie rods are attached to the two wedges. Its working process is as follows: ...

AI Technical Summary

Problems solved by technology

[0003] However, in the existing elevator safety gear, since the wedge blocks slide upward relative to the guide blocks to clamp the elevator guide rails, this sliding clamping method easily leads to unbalanced force on the upper and lower ends of the wedge blocks. Reduced fit between the wedge and elevator guide rails, and the wedge face between the wedge and the guide is prone to wear

At the same time, since the upper end of the guide block is in plane contact with the clamp seat, and the guide block is directly connected to the U-shaped spring through the action of the positioning bolt, when the wedge block continues to be pulled upward, the guide block cannot effectively release the resistance and appear The phenomenon of lateral deflection leads to the inability of the guide block, the wedge block and the U-shaped spring to fit together tightly, which affects the balanced transmission of the braking force

Therefore, the existing elevator safety gear has problems such as unbalanced braking force, unsatisfactory braking effect, high potential safety hazard, and short service life.

Images