Luffing jib tower crane and its standard section introduction system and standard section introduction method

Abstract

The invention discloses a standard knot introduction system of a movable arm tower crane. The standard knot introduction system comprises a tower body, an arm frame, a balance arm, a main hoisting mechanism, an amplitude changing mechanism and an auxiliary hoisting mechanism, wherein the arm frame comprises an arm root close to the tower body, and an arm tip far away from the tower body; the main hoisting mechanism comprises a main lifting hook which is arranged at the arm tip position of the arm frame; the amplitude changing mechanism is arranged on the balance arm; the auxiliary hoisting mechanism comprises an auxiliary lifting hook, an auxiliary winch, a fixed pulley and an auxiliary steel wire rope; the fixed pulley is arranged at the position, close to the arm root, on the arm frame; the auxiliary steel wire rope bypasses the auxiliary winch and then is wound around the fixed pulley; the auxiliary lifting hook is connected to the end part of the auxiliary steel wire rope. The invention also provides the movable arm tower crane with the standard knot introduction system and a method for introducing a standard knot through the standard knot introduction system. The auxiliary hoisting mechanism of the movable arm tower crane hoists the standard knot to the position nearby an introduction platform, the elevation of the arm frame is not over large, the hoisting speed can be quick, the introduction efficiency of the standard knot is high, and rollover caused by over-large elevation of the arm frame is avoided.

Description

technical field [0001] The invention relates to the field of hoisting machinery, in particular to a boom tower crane and a standard section introduction system and a standard section introduction method of the boom tower crane. Background technique [0002] In the field of construction machinery, many products have a large weight and volume, and generally need to be disassembled into multiple parts for transition, and need to be reassembled after arriving at another construction site. For some of these products, such as crawler cranes, horizontal tower cranes and jib tower cranes, in order to avoid using additional equipment, they are generally assembled by self-disassembly, that is, their parts are lifted by their own lifting mechanism to assemble. [0003] see figure 1 , for the luffing jib tower crane, when installing the standard section 90, the standard section 90 is hoisted to the vicinity of its introduction platform 97 through the hook 94 at the top of the jib 92, ...

AI Technical Summary

Problems solved by technology

[0004] However, the luffing jib tower crane has low luffing and hoisting speed when the jib elevation angle is large, and the lifting efficiency from the standard joint to the imported platform is low; more importantly, when the jib is at a large elevation angle for a long time, the directional The danger of rear tipping is extremely unsafe, and the wind at high altitudes is often relatively strong, which increases the danger even more

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