Load lifting limiter of lifting detection device

Abstract

The invention relates to a load lifting limiter of a lifting detection device and belongs to the technical field of lifting safety protection. The load lifting limiter of the lifting detection device comprises a pulley and a force-measuring loop, wherein the pulley is composed of a pulley body which is made from MC nylon, a bearing, a pulley shaft and a dustproof cover; the force-measuring loop is provided with an annular ring, connecting sleeves, fixed plates, microswitches, adjusting screws, locking screws and locking plates; two pairs of connecting sleeves and fixed plates which are perpendicular to each other are welded in the annular ring; the connecting sleeves are arranged on the upper and lower plumb lines on the inner side of the annular ring; the fixed plates are fixed on the horizontal line on the inner side of the annular ring; the central connecting lines of the two fixed plates are perpendicular to the central connecting lines of the two connecting sleeves; and one of the connecting sleeves on the force-measuring loop is connected to the pulley shaft. The load lifting limiter provided by the invention is reasonable and simple in structure, easy to produce and manufacture and convenient to mount and adjust; when the lifting load exceeds the designed weight, the microswitches are in contact with the adjusting screws; an alarm power supply circuit is switched on to remind the operator, so that safety accidents are avoided.

Description

technical field [0001] The invention relates to a protection device for controlling lifting overload of a tower crane, and belongs to the technical field of cranes. Background technique [0002] Cranes are widely used in all walks of life and are essential key equipment for large-scale project construction. The lifting capacity limiter is a safety protection measure for cranes. With the continuous development of the construction industry and the continuous improvement of the mechanization level of construction, the requirements for the manufacturing quality and technical level of the tower crane are also getting higher and higher. Lifting safety accidents occur frequently due to lifting overload, and installing a lifting weight limiter on the lifting machinery is an important guarantee to prevent such accidents from happening. A conventional load limiter includes two force-measuring rings, one end of the two force-measuring rings is fixed to the root of the boom of the towe...

AI Technical Summary

Problems solved by technology

The limit switch and the contact installed on the arc-shaped shrapnel of the force measuring ring of the existing lifting capacity limiter are glued in the force measuring ring body with AB glue. Due to different regions and seasons, the temperature difference is large, and the morning and evening of the same region are different. There are also big differences, such as thermal expansion and contraction of metals, changes in the deformation coefficient of materials, and aging and peeling off of glue.

Affects the performance and service life of the lifting capacity limiter

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