1.    pin connection

Advantages:reliable transmission force, good tenacity and plasticity, easy checked quality, anti dynamic load, and fixed firmly.

Disadvantages: high requirements of manufacture.

2.    bolt connection

Advantages: installing conveniently, and sample equipment.

Disadvantages: when the bolt’s precision is low, receiving shear isn’t easy; but when the bolt’s precision is high, manufacture and installation is very difficult.

3.    high strength bolt connection

Advantages: good connection tenacity and ductility of gantry crane , easy checked quality and even transmission force; dynamic load ‘s and low temperature’s structure, reliable connection .

Disadvantages: complex technology of friction surface, high price and loose easily.