Spring type safety limiting caution device for lifting rope of gantry crane

Abstract

The invention discloses a spring type safety limiting caution device for a lifting rope of a gantry crane. The spring type safety limiting caution device comprises a safety limiting frame and a limiting detector, wherein two sides of the safety limiting frame are suspended on a lower chord of an arm head of a lifting arm through a steel wire rope; and the limiting detector is mounted in the middle of the steel wire rope on one side of the safety limiting frame. Compared with design technology of a frequently-used lever type heavy punch limiting device, the phenomenon of false operation of a switch caused by high-altitude shaking of a heavy punch due to insufficient self weight is eliminated, problem of corrosion damage of the limiting switch caused by easy water seepage and accumulation of the original lever type heavy punch limiting hinge point is solved, the normal and continuous production of the crane is ensured, and safety performance is more reliable. The spring type safety limiting caution device is simple in structure, convenient to mount and dismount, and stable in performance.

Description

technical field [0001] The invention relates to the field of crane equipment, in particular to a device for safely limiting the hoisting height of a hoisting rope of a large crane. Background technique [0002] When a large portal crane is in operation, the lifting height can reach more than 100 meters. When the lifting height of the lifting rope is relatively high, it is difficult for the operator to identify and judge the exact position of the hook under the head of the boom with the naked eye. If you continue to operate the hoisting rope during the operation, the hook may collide with the head of the jib (that is, the hook "jumps to the top"), resulting in a safety accident. In order to avoid safety accidents, a lifting height limiter is usually set at the hoisting rope under the jib head to prevent the hook from continuing to rise after exceeding the specified safety distance when hoisting, causing the hook to "shoot to the top", reaching The purpose of avoiding safety ...

AI Technical Summary

Problems solved by technology

At present, the commonly used lifting height limiter mainly adopts the lever type heavy hammer limiter, taking the MQ2000 Jilin portal crane as an example (such as Figure 4 As shown), this device has the advantages of simple structure, etc., but its safety and reliability are not high, and there are the following main disadvantages in use: First, the lever system cannot bear the heavy suspension weight, so it often causes heavy weight due to insufficient weight of the weight. The hammer jumps up and down, causing the limit switch to malfunction; secondly, because the heavy hammer is set in the lifting wire rope, once the wire rope breaks, it is easy to hang the heavy hammer and cause the limit switch to malfunction; thirdly, because the hinge point of the limit switch box is easy to Water ingress and accumulated water will cause the switch elements in the switch box to be easily corroded and damaged

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