Lifting overweight protection device for hoister

Abstract

The invention discloses a lifting overweight protection device for a hoister, and pertains to the technical field of protection facilities for the hoister. The hoister comprises a hoister body arranged on the ground. The lifting overweight protection device comprises a spring box, wherein the spring box has a spring accommodating cavity, and a connection mechanism is fixed on one end of the spring box on the outer wall; a draw bar, wherein one end of the draw bar is located in the spring accommodating cavity, a draw bar base plate is fixed on the end portion of the end, the upper portion of the draw bar base plate forms a signal contact, and the other end of the draw bar is fixed on the ground; a spring, wherein the spring is sleeved on the draw bar, on end of the spring is supported on the draw bar base plate, and the other end of the spring is supported on the cavity wall of the spring accommodating cavity; a cover plate, wherein the cover plate is matched with the spring box and fixed with the spring box, and a signal contact sliding groove is arranged at one end of the cover plate; and an overweight signal acquisition mechanism, wherein the overweight signal acquisition mechanism is arranged on the cover plate and matched with the signal contact. The protection device has advantages of convenient installation, convenient usage and convenient maintenance. According to the invention, set work efficiency of the hoister body can be enhanced, good action reliability and security are achieved, and long service life can be ensured.

Description

technical field [0001] The invention belongs to the technical field of protection facilities for hoists, and in particular relates to an overweight protection device for a hoist. It is mainly but not limited to the overweight protection of the material hoist for the construction derrick. Background technique [0002] In the building construction site, there are usually stacked derricks (called well-shaped derricks in the industry), and the higher the floor, the higher the height of the derrick. , steel and other hoisting cages to the required floors, the cage is connected by a steel wire rope to the hoist (usually called the hoist) that is accompanied by the derrick and reliably fixed on the floor, and the forward and reverse of the motor of the hoist Rotate to raise or lower the cage. In order to ensure safety, the hoist is usually equipped with various protective devices. A typical example is the "torque limiting device" recommended by the utility model patent authoriza...

AI Technical Summary

Problems solved by technology

A typical example is the "torque limiting device" recommended by the utility model patent authorization announcement number CN2183354Y. Although this patent has the advantages described in the 7th line on the second page of the instruction manual to the 11th line on the third page, it is troublesome to install and has a complicated circuit structure. The shortcoming of; CN2376465Y provides although " construction tower crane comprehensive limiting device " has various functions such as the height limit to suspension hook, the zero position limit to suspension hook, weight limit, moment limit (specifically can refer to instruction manual 2nd paragraph on page 2), but there is a lack of low reliability; the "derrick lifting anti-shock top limit device" disclosed by CN2068496U can avoid problems such as wire rope jumping off, hanging cage (suspension basket) falling and causing Accidents such as casualties, but it does not have the protection function for lifting overweight

[0003] In summary, in the published patents and non-patent literatures including the above-mentioned documents, there is no such thing as simple structure, convenient installation and maintenance, and action Technical Enlightenment of Highly Reliable Lifting Overweight Protection Device for Hoist

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