Research On Differential Decelerator Horizontal Displacement Compensation Of Luffing Mechanism Of Large Crane

With booming development of import and export trade of port, the direction of port handling cranes is large scale, high speed, light weight, high efficiency, and energy conservation. In order to adapt to this development direction, a series of technical innovations are used on port machinery. The application of mechanical differential decelerator on bridge type grab ship unloader can realize the combined movements of lifting mechanism, switching mechanism and trolley traveling mechanism. This decelerator can largely simplify actuating device, get cramped construction, relieve the self weight of complete appliance, and in line with the future development trends of port cranes. Inspired by the application, this thesis applies the planet differential technique on lifting mechanism and luffing mechanism of single-boom portal crane. The differential decelerator can realize the horizontal-motion of hoisting during the luffing process of crane. This also can reduce the power loss of driving mechanism and the self weight of complete appliance.This thesis takes large single-boom portal crane as the research object. According to planet differential principle, the thesis uses a differential decelerator to combine the lifting mechanism and the switching mechanism as one. It uses the differential compensation gear train to realize the motion path of cargo is along horizontal line or approximately horizontal line by lifting drum.This thesis builds model about horizontal movement compensation of hoisting of single-boom portal crane. This model include the arrangement pattern of planetary gear train in differential decelerator, computation model and calculation formula of horizontal movement of hoisting.It also analyzes the motions of crane jib and hoisting which are realized by the planetary differential decelerator during different working conditions of lifting and luffing mechanism. The paper deduces the relationship of the number of teeth of external ring gears which differently connected to lifting drum and luffing drum. These gears are important component of the planetary gear train of differential decelerator. Combined with the differential decelerator, the thesis mainly introduces 2K—H (NGW) type gear train.The content includes the conditions and methods of the number of gear teeth matching in planetary gear transmission. Taking MQ1625 as example, the thesis calculates the matching of the number of gear teeth, and introduces the computational procedure.The thesis uses VB software to compile "horizontal movement compensation of hoisting by differential decelerator design system".This includes the calculation about horizontal movement compensation of hoisting and the matching of planetary differential gear train. This can be served as reference to designer who matches the number of gear teeth of differential decelerator.