Introduction to the main components of the steel s

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The steel structure of portal crane is composed of cross portal frame, rotating column, truss A-frame and rigid tie rod combined boom. Among them, gantry, A-frame, rotating column and boom are the main stress components

gantry: the gantry structure supports all self weight and all external loads of the upper rotating part. Therefore, the gantry structure is of great significance to the stability of the whole crane and reduce the dead weight. The mass of gantry structure is about 20% - 30% of the mass of the whole crane. In order to ensure the normal and stable operation of the crane, the gantry must have sufficient strength, especially large stiffness. The gantry structure can be divided into rotating column gantry, large bearing gantry and fixed column gantry. According to the type of steel used in the gantry, it can be divided into truss gantry, plate girder gantry and box gantry

A-frame: in portal cranes, in order to support the boom, A-frame is generally set. This method is to increase the viscosity of heavy oil. The push rod of the luffing mechanism, the pull rod of the combined boom and its counterweight lever are all connected with the A-frame. The A-frame is supported on the rotating platform. The structural type of A-frame is related to the basic parameters of the crane, the type of boom and luffing mechanism used

rotating platform and rotating column: the metal structure of the platform widely used at present is composed of two longitudinal girders and flat plates. According to the force, these beams can be made into box section or I-section, and the boom and A-frame are supported on the platform of SAMPE Beijing Branch. In addition, there is a lifting rotating platform connected with the rotating column. The two lower support seats of the boom are welded at the end of the main beam of the platform

the rotating column is often made into a pyramid thin-walled box structure, with high stiffness and light weight. Because the cross-section size of the rotating column is large and the arm thickness is small, in order to ensure local stability and peripheral rigidity, the arm is often strengthened with horizontal and longitudinal bars at the same time in the rotating column

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