Safety hook

Abstract

The invention discloses a safety hook which comprises a first arm, a second arm, a third arm, a supporting column and an elastic piece, wherein the lower end of the first arm is pivoted with one end of the second arm; a transverse stopper is arranged on the third arm; the lower side surface of the other end of the second arm is stopped on the transverse stopper of the third arm; two ends of the elastic piece are respectively and fixedly connected with the first arm and the third arm; the supporting column is parallel to the elastic piece and is positioned between the first arm and the third arm, so that the elastic piece is kept in an elastic deformation state; the elastic piece has a restoration trend which can enable the stopper on the third arm to be separated from the lower side surface of the second arm; the supporting column is made of a combustible material; the elastic piece is made of a non-combustible material; and an import part which is made of the combustible material and can enable a workpiece to immerse in quenching oil because of ineffectiveness of the second arm due to combustion is arranged on the hook. When the workpiece is on an oil surface and can not move to cause the combustion of the quenching oil, the supporting column is combusted and damaged, so that the workpiece drops in the oil, the immediate temperature of the oil is reduced, the combustion is stopped, the fire danger is eliminated, and a fire-extinguishing safety function is realized.

Description

technical field [0001] The invention relates to a hook used for metal heat treatment and quenching, in particular to a safety hook. Background technique [0002] At present, during metal heat treatment and quenching, when the workpiece contacts quenching oil, the temperature of the oil surface rises instantaneously, which will cause combustion. Under normal circumstances, the workpiece will be immersed in the oil quickly, and the temperature of the oil surface will drop quickly, and the combustion will stop. However, under special circumstances, for various reasons such as sudden power failure, the workpiece is suspended on the oil surface, which may cause a fire. Contents of the invention [0003] In order to make up for the above deficiencies, the present invention provides a safety hook, which has a simple structure and can loosen the workpiece when the quenching oil burns due to an abnormal fall of the workpiece, so as to prevent fires. [0004] The technical solution...

AI Technical Summary

Problems solved by technology

However, under special circumstances, for various reasons such as sudden power failure, etc., the workpiece is suspended on the oil surface, which may cause a fire.

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