Method of constructing a superlift on a crane

Abstract

A method for constructing a super-life device on a crane is disclosed. The crane comprises a main hoisting mechanism and an auxiliary hoisting mechanism; the main hoisting mechanism comprises a main jib, a main winch and a main steel wire rope; and the auxiliary hoisting mechanism comprises an auxiliary jib, an auxiliary winch and an auxiliary steel wire rope. The method comprises the following steps: installing a first end of the auxiliary jib on the main jib and taking the auxiliary jib as the super-lift mast of the super-lift device; drawing the auxiliary steel wire rope from the auxiliary winch, winding successively a second end of the auxiliary jib and the head of the main jib and then fixing the steel wire rope to the second end of the auxiliary end, or drawing the auxiliary steel wire rope from the auxiliary winch, winding the second end of the auxiliary jib and then fixing the steel wire rope to the head of the main jib; driving the auxiliary winch to rotate, pulling the auxiliary steel wire rope tightly so as to provide pretightening force for the super-lift device, and constructing the super-lift device for the crane by utilizing the auxiliary jib, the auxiliary winch and the auxiliary steel wire rope. By utilizing the above method, a simple super-lift device can be constructed for small and medium size cranes, and the lifting performance and the usage safety of small and medium tonnage cranes are improved.

Description

technical field [0001] The invention relates to the technical field of cranes, in particular to a method for constructing super-lifting devices on small and medium-sized cranes. Background technique [0002] In recent years, wheeled cranes are constantly developing towards large tonnage and super large tonnage. With the continuous increase of lifting tonnage and hoisting height, the requirements for the length, strength and stiffness of the boom are also getting higher and higher. At present, in order to increase the rigidity of the boom and reduce the disturbance, the large-tonnage cranes on the market use super-lifting devices for the boom. [0003] figure 1 It is a structural schematic diagram of an existing super-lifting device installed on a crane. The super-lifting device mainly includes a Y-shaped super-lifting mast 13, one end of which is fixed and hinged to the boom 15, and the other end is a movable end; Device 16, it comprises winch 10, steel wire rope 12 and mo...

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Problems solved by technology

[0004] Existing super-lifting devices are mainly used in large tonnage (lifting capacity greater than 90 tons) cranes, but have not yet been applied to small and medium tonnage cranes, mainly because of the following disadvantages: super-lifting devices need to add additional ratchet winches, super-lifting variable Compared with small and medium-sized cranes, the hydraulic oil cylinder, the super-lifting swing oil cylinder and other mechanisms, as well as the supporting hydraulic and electrical pipelines and control systems, are more expensive, complex in structure, and difficult to repair after failure; the structure of the super-lifting device is huge and the structure It is heavy, often up to 10 tons, and it is not easy to install, disassemble and transport

[0005] The above reasons determine that the existing super-lifting device can only be applied to large-tonnage cranes, yet the number of small and medium-sized cranes in the market accounts for more than 80% of the total number of cranes, and frequent boom accidents (such as boom booms) break) are also concentrated in small and medium-tonnage cranes, and there is no super-lifting device suitable for small and medium-tonnage cranes on the market

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