Tower crane

Abstract

Disclosed is a tower crane, comprising a slewing platform (1), and a crane jib (2) and a counter jib (3) both fixed to the slewing platform (1), the crane jib (2) and the counter jib (3) extending from the slewing platform (1) respectively in opposite directions substantially along a first axis (X), wherein the tower crane also comprises two supports (4) and at least four cables (5), the two supports (4) being rotatably hinged to the slewing platform (1) such that said supports can rotate about the slewing platform (1), and extending from the slewing platform (1) respectively in opposite directions substantially along a second axis (Y) intersecting with the first axis (X), and each of the supports (4) being connected to the crane jib (2) and the counter jib (3) via two cables (5) respectively. The tower crane can enhance the anti-roll capability thereof without increasing the rigidity of the crane jib itself.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a tower crane. Background technique [0002] The tower crane includes a slewing platform and a lifting arm and a balance arm fixed on the slewing platform, and the lifting arm and the balancing arm extend from the slewing platform to opposite directions approximately along the same axis. Because tower cranes usually work in open places such as construction sites, tower cranes usually need to consider the influence of wind loads, especially on the boom. The jibs of the existing tower cranes all rely on the stiffness of the jib itself to withstand wind loads, and this design has a very limited ability to withstand wind loads. Especially for super-long arms, once a sudden strong gust of wind acts on the boom, the stiffness of the boom is often not enough to withstand the wind load, causing the boom to bend to a certain extent. The boom is suspended with heavy objects, and the ...

AI Technical Summary

Problems solved by technology

The jibs of existing tower cranes rely on the stiffness of the jib itself to resist wind loads, and this design has very limited ability to withstand wind loads

Especially for super-long arms, once a sudden strong gust of wind acts on the boom, the stiffness of the boom is often not enough to withstand the wind load, causing the boom to bend to a certain extent. The boom is suspended with heavy objects, and the gravity of the heavy objects will cause the boom to bend twice, thus causing the boom to roll

If the stiffness of the boom is increased by means of the size of the boom itself, it will not only increase the weight of the boom, but also increase the weight of other parts such as the tower body and the lower vehicle to increase the load-carrying capacity, resulting in an increase in the weight of the whole vehicle , but also increase the cost of manufacturing, transportation, etc.

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