Four-rod-crossing amplitude compensation device

Abstract

The invention discloses a four-rod-crossing amplitude compensation device, which can realize amplitude variation in horizontal direction, and is composed of a cross arm, a rear arm, a short arm, a front arm, a guide wheel, a vertical guide rail, a hanger steel wire rope winding system and a counter weight. The four-rod-crossing amplitude compensation device is characterized in that the upper end of the rear arm is hinged with an upper part of a crane, the middle point of the rear arm is hinged with the middle point of the cross arm, and the lower end of the rear arm is hinged with the lower end of the front arm; the lower end of the cross arm is provided with the guide wheel which can move up and down along the vertical guide rail, and the upper end of the cross arm is hinged with the upper end of the short arm; the lower end of the short arm is hinged with the middle point of the front arm; and the cross arm, the rear arm and the front arm are same in length, and the short arm is 1 / 2 of the front arm in length. The steel wire rope of the winding system extends along the rear arm to reach a pulley at the lower end of the rear arm after passing through a pulley at the top end of the rear arm, and then hangs downwards after reaching the pulley at the top end of the front arm by extending along the front arm. When the amplitude varies, the guide wheel at the lower end of the cross arm moves up and down along the vertical guide rail, the peal of the front arm moves horizontally, thus the amplitude variation in the horizontal direction of hangers is realized. The four-rod-crossing amplitude compensation device has the advantages of simple structure, low center of gravity, small appearance size, good stability, short guide rail length, easiness in overall arrangement, implementation of ideal horizontal amplitude variation, and saved energy consumption, and can be widely applied to various cantilever cranes.

Description

Technical field [0001] The four-bar cross luffing compensating device is a horizontal luffing technical solution invented by jib cranes belonging to the technical field of cranes. Background technique [0002] When the crane is loading and unloading, in order to reduce the driving power of the luffing mechanism, it is required that the goods move along the horizontal line during the luffing process. At present, there are two types of existing technical solutions at home and abroad, namely, the rope compensation method and the combined jib method. [0003] 1. Rope compensation method: It is mainly used in single-arm frame systems. The length of the lifting wire rope is large and the wear is serious. When the load is small, the suspension length of the cargo is large, the swing range is also large, and the speed is low, which affects the loading and unloading efficiency, and the spreader can only be approximately horizontal It consumes a lot of energy when moving and changing...

AI Technical Summary

Problems solved by technology

[0006] 1) Four-link combined jib frame, the spreader only moves approximately horizontally when luffing, and the overall size is large

[0007] 2) The parallelogram combined jib can realize horizontal luffing, but it has large dimensions, high center of gravity and poor stability

[0008] 3) The curved elephant trunk combined with the jib, the jib system has poor rigidity, the jib torque is large when turning, the torsion resistance is poor, and the overall size is large, so it can only approximate the horizontal luffing

[0009] The boom system of the above three technical solutions has a large mass and a large starting braking inertia force, which affects the speed of loading and unloading operations.

The overall layout is difficult and the stability is poor

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