Construction crane hoist

 Electric  hoist crane  is a steel structure, organization and control of three major components, which is characterized by an electric hoist lifting mechanism. Among them, the steel is steel or steel and other basic components, the use of methods such as welding or bolting, according to certain rules of structure connected up to become able to withstand the load of the crane structure, called crane steel structure.
    Steel the basic requirements. Crane steel must have sufficient strength, rigidity and stability.
1, the intensity of the external force capacity is not destroyed.
2, the stiffness under external force limiters deformability.
3, stability? Under loads without buckling capability.
    Electric hoist gantry crane  structure:
1, the carrier member carrying member with the main beam, side beam, outrigger beams up and down.
2, non-load-bearing member with non-member walkway, ladders, railings, platforms, guardrails and operating room skeleton.
    Carrying member needs to calculate the strength, stiffness and stability, non-bearing framework does not require design calculations, but need to consider the security design. Hoist crane carrier mostly bent rod and rod curved scissors, involving tensile and compressive strength, flexural strength, shear strength and compression strength. It is different from other types of cranes are characterized by local bending beam flange calculation. Relatively speaking, electric hoist jib crane  steel structure dynamic stiffness of poor, mostly because the use of squirrel-cage motors, speed control is poor.