Crane and slewing bearing structure thereof

Abstract

The invention discloses a slewing bearing structure of a crane. The structure comprises a support case, an inner cylinder, an outer cylinder, mounting plates and a cover plate. The end face of the support case is a connection board, and the bottom of the support case is a base plate. One end of the inner cylinder is welded with the base plate, and the other end of the inner cylinder is welded with the cover plate. One end of the outer cylinder is welded with the connection board, and the other end of the outer cylinder is welded with the cover plate. The mounting plates are symmetrically arranged in the support case, and the distance from the mounting plates to the inner cylinder is greater than the distance from the outer cylinder to the inner cylinder. As the distance from the mounting plates to the inner cylinder is greater than the distance from the outer cylinder to the inner cylinder, when the mounting plates and the inner cylinder are welded on the base plate of the support case, the welding deformation is reduced obviously. When the slewing bearing structure is applied with force, as the distance between the mounting plates and the inner cylinder is large, the base plate uniformly disperses the applied pressure, thereby realizing more reasonable bearing on the base plate. The invention also discloses a crane installed with the above slewing bearing structure.

Description

technical field [0001] The invention relates to the technical field of crane production, in particular to a crane and its slewing support structure. Background technique [0002] The crane is divided into the upper part and the lower part. The lower part mainly plays the role of supporting the upper part. The upper part can rotate 360 ​​degrees relative to the lower part to meet the requirements of the crane for hoisting items at different angles. The car part and the getting off part are connected through a slewing support bearing, and the slewing support bearing is installed on the slewing support structure of the getting off part. [0003] The slewing support structure is the main force-bearing part, so it is generally large in size. At present, the slewing support structure of crawler cranes generally adopts the form of double cylinders welded to the bottom plate, such as figure 2 As shown in , the two ends of the inner cylinder 13 and the outer cylinder 12 are welded w...

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Problems solved by technology

[0004] But, because the distance between the inner cylinder 13 and the outer cylinder 12 is small, and the steel plate is thicker, the base plate 14 will have a large welding deformation during the welding process of the inner and outer cylinders and the base plate 14, resulting in a problem that is not easy to eliminate. Welding stress increases the difficulty of welding, which makes it difficult to guarantee the welding quality, and because the distance between the inner cylinder 13 and the outer cylinder 12 is small, it is easy to cause stress on the bottom plate 14 during the load bearing process. Excessive concentration will increase the probability of deformation of the bottom plate 14 under compression, reducing the reliability of the crane

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