two-way safety gear

Abstract

The invention discloses bilateral safe pliers which comprise a framework, a brake apparatus and a lifting mechanism. The bilateral safe pliers are characterized in that the brake apparatus comprises a left bidirectional fixed wedge block, a right bidirectional fixed wedge block, a left bidirectional movable wedge block and a right bidirectional movable wedge block, the left bidirectional movable wedge block and the right bidirectional movable wedge block respectively vertically and synchronously move relative to the left bidirectional fixed wedge block and the right bidirectional fixed wedge block under the effect of the lifting the mechanism, and when the left bidirectional movable wedge block and the right bidirectional movable wedge block move upwardly and downwardly, the distance between the left bidirectional movable wedge block and the right bidirectional movable wedge block can be reduced until guide rails of an elevator can be clamped, so that the elevator can be braked. The bidirectional safe pliers have the advantages that when the elevator moves upwardly or falls downwardly at excessively high speeds due to failure and the left bidirectional movable wedge block and the right bidirectional movable wedge block move upwardly and downwardly, the distance between the left bidirectional movable wedge block and the right bidirectional movable wedge block can be reduced until the guide rails of the elevator can be clamped, so that the elevator can be braked, and the bilateral safe pliers are good in braking effect; the elevator can be braked by the same brake apparatus when moving upwardly and downwardly, accordingly, the bidirectional safe pliers are small in integral size and simple in structure, and the production cost can be reduced.

Description

technical field [0001] The invention relates to an elevator accessory, in particular to a two-way safety gear used for braking a car when the elevator overspeeds. Background technique [0002] The early elevator brake safety gear generally only has a downward overspeed braking device, but no upward overspeed braking device, so there are occasional elevator accidents. Nowadays, through the scientific research of many elevator manufacturers, a variety of safety gears that can brake in both directions have been invented. Existing two-way safety gear mainly can be divided into following several kinds: 1, split type safety gear, this split type safety gear comprises upper brake safety gear and lower brake safety gear, wherein, upper brake safety gear is installed on the elevator Above the car, the lower brake safety gear is installed below the car, or the upper and lower safety gear are installed side by side below the car. No matter which of the above installation structures is...

AI Technical Summary

Problems solved by technology

Existing two-way safety gear mainly can be divided into following several kinds: 1, split type safety gear, this split type safety gear comprises upper brake safety gear and lower brake safety gear, wherein, upper brake safety gear is installed on the elevator Above the car, the lower brake safety gear is installed below the car, or the upper and lower safety gear are installed side by side below the car. No matter which of the above installation structures is used, two safety gears need to be installed. Larger and more expensive

2. Single eccentric safety gear. The brake block of this type of safety gear is peach-shaped eccentric, which is installed under the car. Its main disadvantage is that the braking force has a large one-way impact on the guide rail, which will cause deflection to the car. Impact force, imbalance when braking

The two-way safety tongs of the elevator are equipped with a pair of fixed wedges, a pair of brake wedges and a compression spring on the upper braking device and the lower braking device, so it will inevitably lead to an increase in the height of the frame, an increase in volume and an increase in production cost.

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