crane
Crane (Crane), refers to the use of hooks or other lifting device hanging heavy objects, in the space for lifting and transportation and other circular operation of the machinery. There are many categories of cranes, "crane", "tower crane", "crane", "traffic" and other commonly known as the crane is a class or several categories. According to the structure can be divided into bridge crane, cable crane and boom type crane three categories, according to the device can be divided into hook crane, grab crane, electromagnetic crane and other 15 categories, according to the mobile can be divided into fixed Cranes, climbing cranes, then moving cranes, radial rotary cranes, walking cranes five categories, in accordance with the drive can be divided into manual cranes, electric cranes, hydraulic cranes three categories. As well as in accordance with the rotation ability, support, mode of operation to classify. ...