Rigid four-bar balance crane

Abstract

The invention provides a rigid four-bar balance crane. The rigid four-bar balance crane is characterized by comprising a gantry assembly, wherein a rotating platform is pivoted on the gantry assembly; a lower girder is hinged on the rotating platform; an upper draw bar is located below the lower girder, an upper hinging point on a balance weight connecting bar is hinged on the upper draw bar, a lower hinging point of the balance weight connecting bar is hinged on the lower girder, an upper hinging point on a front girder is hinged on the upper draw bar, a lower hinging point of the front girder is hinged on the lower girder, and connecting lines of the four hinging points form a parallelogram; one end of a lower hydraulic cylinder is hinged on the rotating platform, and the other end of the lower hydraulic cylinder is hinged at the middle part of the lower girder; one end of an upper hydraulic cylinder is hinged on the lower girder, and the other end of the upper hydraulic cylinder is hinged at the middle part of the balance weight connecting bar; and hydraulic grabs are arranged at the lower end of the front girder. According to the rigid four-bar balance crane, the operation is simple, the dead weight is reduced, and the maintaining cost is lowered.

Description

technical field [0001] The invention belongs to a hoisting machine, in particular to a portal type crane. Background technique [0002] One of the technical schemes of the prior art portal crane is: a four-link portal crane. [0003] The structure of the four-link portal crane: four-link boom, rack luffing, balance counterweight, the two ends of the small tie rod are respectively connected with the balance counterweight and the main boom frame, and can rotate 360° forward and reverse. The rotary support device adopts a large rotary bearing. The crane can perform movements such as lifting, rotating, luffing and walking. [0004] The working principle of the four-link portal crane: two sets of lifting mechanisms, one is responsible for the support of the grab; the other is responsible for the opening and closing of the grab. The grab opening and closing and lifting operations are realized through PLC control. [0005] The disadvantages of the above-mentioned four-link port...

AI Technical Summary

Problems solved by technology

[0006] Disadvantage 1: high maintenance costs, relatively low reliability, relatively low production efficiency;

[0007] Disadvantage 2: It is heavy, and there are few places to adapt to

[0012] Disadvantage 1: high maintenance costs, relatively low reliability, relatively low production efficiency;

[0013] Disadvantage 2: It is heavy, and there are few places to adapt to;

[0014] Disadvantage 3: The hoisting wire rope wears out quickly

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