Unfolding/folding device of auxiliary arm, arm support structure and crane

Abstract

The invention discloses an unfolding / folding device of an auxiliary arm. The unfolding / folding device of the auxiliary arm comprises a supporting mechanism (30) for supporting an auxiliary arm (20), wherein one end of the supporting mechanism (30) is connected with the auxiliary arm (20); and moreover, the supporting mechanism (30) can rotate relative to the auxiliary arm (20), the rotating axis is the extending direction of the supporting mechanism (30), and the other end of the supporting mechanism (30) is provided with a roller (33). The invention also provides an arm support structure comprising the unfolding / folding device of the arm support and a crane. When the auxiliary arm is unfolded or folded, the function of supporting can be provided to the auxiliary arm by the supporting mechanism, so that the interference of the self weight of the auxiliary arm to the operation and the damage of the self weight of the auxiliary arm to a main arm can be avoided; and in addition, the movement of the auxiliary arm can be guided by the roller, and the aims of always providing the function of supporting to the auxiliary arm by the supporting mechanism in the operating process and also guiding the unfolding or folding action of the auxiliary arm can also be achieved. Therefore, the operation of unfolding or folding the auxiliary arm can be effectively and safely carried out by using the unfolding / folding device of the auxiliary arm.

Description

Technical field [0001] The present invention relates to the extension and retraction of the jib of a crane, in particular to a jib extension and retraction device, and a jib structure and a crane including the jib extension and retraction device. Background technique [0002] Most cranes have a main boom and a jib. Taking a wheeled crane as an example, it is necessary to deploy the jib before work and retract the jib after work to save space and facilitate storage. In the existing technology, such as figure 1 As shown, the main arm 10 has a main arm support 12, the main arm support 12 has a first insertion hole 13, the jib 20 has a jib support 22, and the jib support 22 has a second insertion hole 23; , The corresponding ends of the main arm 10 and the auxiliary arm 20 have two main arm insertion holes 11 and two auxiliary arm insertion holes 21. In the unfolded state of the sub-arm 20, the main arm 10 and the sub-arm 20 pass through the first pin ( figure 1 Not shown) connected...

AI Technical Summary

Problems solved by technology

[0003] It can be seen that in the prior art, when the auxiliary arm 20 is manually pulled out, most of the auxiliary arm 20 is in a suspended state, and the self-weight of the auxiliary arm 20 will generate a large force and bending force on the main arm 10 through the first pin shaft. moment, it is easy to cause deformation and damage to the main arm 10

In addition, in the prior art, it is necessary to manually pull out the jib 20, which is labor-intensive and inefficient, and the weight of the jib 20 makes manual operation more time-consuming and laborious.

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