Descending collision avoidance device for elevator

Abstract

The invention discloses a descending collision avoidance device for an elevator. The descending collision avoidance device comprises a plurality of rails, wheels and fork rods, wherein the wheels are arranged in the rails, and the fork rods are connected with the wheels. Retaining parts for preventing the wheels from deviating from the inner edges of the rails are arranged at the inner edges of at least one of the rails. The descending collision avoidance device for the elevator is safe in use, convenient to demount, capable of preventing the wheels from sliding off wheel grooves and well keeping an underframe and a collision avoidance detection board in parallel.

Description

technical field [0001] The invention relates to an elevator, in particular to a downward anti-collision device for an elevator. Background technique [0002] Due to its many advantages, the elevator downward anti-collision device is widely used in the field of elevators. When the existing elevator descends to the lower limit or detects that there is an object blocking the lower part, it can automatically stop the descending action. Therefore, the safety of the objects below and the operation safety of the lift are effectively protected. [0003] The lower limit and anti-collision devices in the prior art have the following structures: [0004] First, it is made of a grooved rod, one end is a hinge fulcrum, and the other hinge end is a drop detection point. The structure and processing of this connection method are relatively simple, but there is a large blind area for the detection of the bottom, and only objects at the falling end can be detected, which has a large safet...

AI Technical Summary

Problems solved by technology

This structure is easy to cause wrong signals. When the elevator descends and stops in the middle position, the spring will bounce up and down, thereby triggering the wrong signal. In addition, when only a certain corner touches the object, the mechanical part of the detection board is easy to get stuck

[0006] Thirdly, the connection structure of double inclined rods is adopted. Due to structural reasons, the anti-collision detection board does not cover all the space below, and there is a detection blind area

As the scissor bar 12 repeatedly presses, the limit plate 1321 slowly swings downward, so there is a risk that the roller 122 will slip out of the groove

[0010] Second, the parallelism of the underframe and the anti-collision detection board

Since the adjustment of the angle is more difficult than the adjustment of the length and the accuracy is not high, the limiting plate 1321 is easy to be torn and broken from the fixing plate 132 due to metal fatigue during multiple adjustments

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