Safety tongs linkage mechanism

Abstract

A safety tongs linkage mechanism comprises linkage sleeves, first lifting rods and second lifting rods. An inner sleeve and a spiral guide rail are arranged in each linkage sleeve. The first lifting rods penetrate through the inner sleeves and are meshed with threads of the inner sleeves, and the first lifting rods drive the spiral guide rails to rotate during lifting so as to drive the second lifting rods to act. Multiple types of linkage sleeves are included. The time that the second lifting rods lag behind the first lifting rods can be completely achieved by selecting linkage sleeves of different types, and gaps between movable wedge blocks and guide rails do not need to be calibrated.

Description

Technical field[0001]The invention relates to the technical field of elevator safety gear, in particular to a safety gear linkage mechanism.Background technique[0002]With the popularity of elevators, their safety performance has gradually become a concern of major elevator manufacturers. In order to ensure the safety of elevators, elevators usually include safety gears. With the increasing speed of elevators, progressive safety gears have gradually become the mainstream safety gear. However, the existing progressive safety gears all act in a single action, and the heat generated during braking is relatively high and the braking adjustment range is high. It is small and difficult to achieve a good braking effect against various overspeed situations. For this reason, Patent Document 1 discloses an elevator emergency braking device and an elevator. The emergency braking device connects at least two safety gears in series. Together to brake the guide rails together to achieve the purpos...

AI Technical Summary

Problems solved by technology

As the speed of the elevator continues to increase, the progressive safety gear has gradually become the mainstream safety gear. However, the existing progressive safety gear is a single action, and the heat generated during braking is relatively high, and the braking adjustment range is limited. Small, it is difficult to have a good braking effect on various overspeed situations. For this reason, Patent Document 1 discloses an emergency braking device for an elevator and an elevator. The emergency braking device connects at least two safety gears in series Brake the guide rail together to achieve the purpose of safe braking. The two safety gears are pulled together by the lifting rod 12. By setting the gap size L1 between the upper brake part and the guide rail, the gap size between the lower brake part 42 and the guide rail L2 is small, so that the upper and lower brake parts perform braking action successively, and the braking performance of each brake device is fully utilized. However, it is necessary to adjust the gap between the upper and lower brake parts every time during installation. It is cumbersome and the precision is not high. In addition, the time when the lower brake parts are added to the brake is uncontrollable, and the action process is relatively sudden when the lower brake parts are added to the brake, and the impact on the lower brake parts is relatively large; Document 2 discloses an elevator safety tongs, which adds a lower tong body that can work together on the basis of the existing upper tong body in the form of progressive safety tongs. The dynamic friction area improves the braking effect. However, the lower caliper body is driven and braked by the pull-down rod 42 with a strip hole. The lower caliper body only moves after the upper caliper body brakes for a certain distance. The lower caliper body does not Synchronized with the upper caliper body, and the lower pliers body only moves when the upper pin shaft 411 abuts against the upper end of the strip hole, its intervention braking action is relatively sudden, and the movement of the lower movable wedge 32, pull rod 42, and guide rail 5 is relatively sudden. The impact is relatively large, while improving the braking effect, it also introduces the impact of the safety gear, which reduces the service life of the safety gear and introduces unnecessary noise.

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