Several classifications Port Machinery

      Port machinery we all know , this is only for certain machinery a general term which refers not just mechanical . For example , port  hoist gantry crane  , quay cranes , harbor cranes, etc. belong to the port machinery . In order to better understand them , understand them , or to better manage them, we often classify them . The current classification is usually this: the composition of the unit body shape , rod connected to the external load and structure as well as the mutual position in space , three.
1, where unit body shape can be divided according to the following three :
Rod structure which is a combination of many rod member , and each rod member is characterized by a height, width , and a length great .
The lever itself can either be a general steel, it can be thin-walled structure . Thin-walled structure, which means the body is characterized by a width, length is large, while the thickness is very small, such as sheet metal , shell and thin-walled parts . Such structures such as  bridge gantry crane  metal structure in the promotion of the use , there will be a very significant value .
Physical structure , the main features of this structure is that the length, width , and high measure of those who have similar structures . This structure in the metal structure of the crane hardly been used.
2, according to rod connected to the situation can be divided into three categories:
Hinge structure , two or more rods coupled to the node point is called , assuming all nodes in the structure are ideal cylindrical articulation , the lever only by the axial force , called the hinge structure of this structure .
Rigid structure, the structure of the nodes are rigid, cross at a junction to a relative displacement of the lever can not , can not occur relative rotation therebetween. Therefore, under external loads , steel generally produce moment, shear and axial force , bending moment which dominated .
Hybrid structure, the structure of both the articulation nodes , there are rigid , hinged lever only by the axial force , steel ground rod is subject to both a bending moment , shear and axial force .
3 , according to the external load and the mutual position of the spatial structure can be divided into two categories :
Planar structure , such as the role and structure of all elements of the load axis of the lever are in the same plane , i.e., structure analysis and calculation carried out only to the plane of the force system , is called the planar structure.
Spatial structure , such as the composition and structure of the applied loads axis of the lever is not in the same plane , then the structure analysis for calculation of force system according to space ,steel crane is called the spatial structure .
Many people may read these are not very clear, but when you carefully read or engaged in this industry, then for this understanding is a must. We need a clear structure and context, so that we can see at a glance which category this machine , the mechanical advantage of the presence in what ? I believe this is what we want !