A crane and its counterweight mechanism

Abstract

The invention discloses a crane and a counterweight mechanism thereof. A cylinder rod of a counterweight oil cylinder of the counterweight mechanism is arranged above a cylinder barrel; the top end of the cylinder rod is connected with a winching bracket; and the cylinder barrel is connected with a counterweight block and a counterweight bottom plate. According to the counterweight oil cylinder with a structure that the cylinder rod is overhead, the cylinder rod only bears the weight of the winching bracket in a first stroke and a second stroke, a third stroke is less than the first stroke, and the weight born by the cylinder barrel is the sum of the weight of the counterweight block and the weight of the counterweight bottom plate, so that when the weight born by the counterweight oil cylinder is less, the stroke is larger, when the weight born is more, the stroke is smaller, the full-load stroke is shortened greatly, a requirement of a system on the synchronism is reduced effectively, and the hooking efficiency is improved greatly. In addition, a piston rod is subjected to a tensile force in a process that the counterweight oil cylinder lifts the counterweight block and the counterweight bottom plate to accomplish final hooking, so that the problem of the instability of the oil cylinder is solved basically, and the safe reliability of hooking operation is ensured.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a crane and a counterweight mechanism thereof. Background technique [0002] The counterweight mechanism is one of the important components of the crane as the counterweight when the crane is hoisted. Therefore, the counterweight mechanism plays a decisive role in the lifting performance of the crane. The balance weight mechanism generally includes a number of balance weights, balance weight bottom plate and winch support, and a balance weight oil cylinder for lifting the above three. The purpose of adjusting the balance weight can be achieved by adjusting the number of balance weights. [0003] Please refer to figure 1 , figure 1 It is a structural schematic diagram of a balance weight mechanism in the prior art. [0004] In the existing technology, such as figure 1 As shown, the counterweight cylinder of the counterweight mechanism is a cylinder top-mounted cy...

AI Technical Summary

Problems solved by technology

[0011] The object of the present invention is to provide a crane and its counterweight mechanism. The counterweight mechanism adopts a cylinder rod top-mounted oil cylinder, which reduces the stroke of the large load movement of the oil cylinder, improves the coupling efficiency, and solves the problem of oil cylinder instability, oil cylinder Problems of internal leakage and open welding of flanges

Images