Telescopic boom structure, boom structure and crane

Abstract

The invention discloses a telescopic arm structure, a boom structure and a crane, which relate to the field of engineering machinery and are used to improve the accuracy of the alignment of pin holes on one-section arm and two-section arm. The telescopic arm structure includes one-section arm and two-section arm. The telescopic arm structure also includes a first limiting member and a second limiting member; the first limiting member is fixedly connected to the one-section arm, so The second limiting member is fixedly connected to the two-section arm. Wherein, the two-section arm moves to an extended position relative to the one-section arm, and the first limiting member and the second limiting member are in face-to-face contact to restrict the two-section arm from continuing to extend. In the above technical solution, a first limiter and a second limiter are added, and face-to-face contact is used to limit the position of the two-section arm. The first limiter and the second limiter have a large contact area, which can reduce the The possibility of deformation of the first limiter improves the stress state of the two-section arm limiter collision, reduces the deformation, and makes the limiter more accurate.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a telescopic arm structure, a boom structure and a crane. Background technique [0002] As an important structural part of the wheeled crane, the belly-mounted jib can be installed on the jib head of the main boom to expand the working space of the crane. The abdominal-mounted jib has the advantages of adapting to narrow working spaces and being easy to use and operate. [0003] Crane: A piece of equipment used to lift heavy loads, mounted on a mobile chassis. [0004] Jib: A structure mounted on the boom head of the main boom to lift the crane working space. [0005] Abdominal-mounted jib: A jib that is hung under the rear section of the main boom when not in operation. When in use, it rotates from the bottom of the main jib along the luffing plane of the crane to the jib head of the main jib for hoisting operations. [0006] see figure 1 with figure 2 , the abdominal-...

AI Technical Summary

Problems solved by technology

[0008] The inventors found that there are at least the following problems in the prior art: the limiting method adopted by the second-section jib 103 in the prior art relies on manpower to pull out the second-section jib 103 by inertia, and the impact force is relatively large during the pulling process

When the two-section jib 103 is pulled out to the limit position, the impact block 100 hits the limit adjustment bolt 101. Due to the large impact force and the small collision area between the impact block 100 and the limit adjustment bolt 101, the setting limit will be set. The limit baffle 105 of the position adjusting bolt 101 deforms greatly, and sometimes even causes the limit baffle 105 to be damaged and affects the use; at the same time, due to the large collision deformation of the limit baffle 105, the first section of auxiliary arm 102 and the second section of auxiliary The centering of the pin shaft hole on the arm 103 is inaccurate, which makes it difficult to insert and remove the connecting pin shaft

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