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# Terminology analysis of suspension crane

Terminology analysis of suspension crane
Axial load: the total vertical force acting on the supporting structure. Calculation formula: axial load = (total weight of crane) + (design factor X lifting load weight).

Main beam length: the total length of the main beam. Note: the working length of the main beam or the coverage of the hook on the beam shall be smaller than the total length of the main beam.

Buffer device: a spacer set between two main beams (or hoist trolleys) in the fixed rail to prevent concentrated overload between hanger points. It limits the minimum distance between main beams or hoists.

Column: the column of the combined self-supporting crane is the "leg" of the combined crane, which is made of square pipe. The crane stands on these "legs".

Deflection: the difference in rail deflection between an unloaded crane and a fully loaded crane is usually calculated in millimeters. In general, Gaobo's design is that the beam crane is L / 450, where l = support center distance or span.

Beam: This is a horizontal beam in the supporting structure of the combined self-supporting crane, which is composed of two back-to-back channel steel, and the fixed rail is hung here.

Total height (OAH): the distance from the ground to the highest point of the crane (including metal components).

Span (main beam): the distance between the center lines of fixed profile rails. The span must be distinguished from the total length of the main beam (oal), which is longer than the span.

Calculation formula (using pre crane): span = {girder length - (2 x girder cantilever length)}

Support Center: This refers to the distance between the centerline of two columns or the hanger along the fixed rail. Note that the center of support determines what type of profile rail needs to be used.

Supporting structure: for the combined self-supporting crane, the supporting structure refers to the supporting component, also known as "gate post" or "terminal frame", which is composed of columns and beams. For a combined crane system, the supporting structure refers to the roof, including truss frame, longitudinal beam, column, etc., where the crane is hung.

Hoist trolley height (TS): on a self-supporting crane, this refers to the height from the top of the hoist trolley pin shaft (the hoist is hung below the pin shaft) to the ground.