Hoist the main operating within the framework of

The main hoist is to run the Department of the Ministry, if the part is not running, then this machine can only say a basket case, in general, there are four active  Wire rope hoist  and driven wheels,Hoist and trolley， but the wheels over four, it must with a balanced frame so that the load dispersion. The metal structure of the bridge from the main beam and side beams, divided into single girder and double girder bridge bridge categories. Master Liang Duanliang on wheels for supporting the bridge. Box-shaped structure can be divided into the right track and off-track boxes and other boxes. Main beam from the upper and lower flange plates and sides of the vertical web composition, which is characterized by simple structure, suitable for mass production, but the larger self. Partial rail box hoist double girder and partial rail box single girder cross-section are from the upper and lower flange plates of different thickness and composition of the main and sub webs. Characterized in that the weight is small, but the manufacture of the more complicated. Four truss structure consists of four combined into a closed space plane truss structure, manufacturing is more complex, less fatigue, fasting truss structure similar to the off-track box girder by four steel plates form a closed structure, in addition to the main webs solid web-shaped beam, the other three steel plates in accordance with the design requirements into many windows, the formation of a non-fasting truss diagonals in the upper and lower horizontal surface paved walkway truss plates, rope hoist and electrical equipment installed operating agencies In bridge internal lighter weight, the overall stiffness, which is more widely used in China as a pattern. Ordinary bridge hoist mainly electric drive, usually in the driver room manipulation, there are remote controlled.  rope hoist  capacity of up to 500 tons, span up to 60 meters.