Crane trolley resistance analysis

    Electric  hoist gantry crane  can run dolly trolley runs along the jib round, luffing speed, handling, accurate positioning, commonly used in the work of the Change. Luffing jib luffing jib around a fixed hinge axis through in the vertical plane to change the pitch angle, thus changing the amplitude, which is widely used in various types of  jib crane   Luffing calculation is based on the percentage change in resistance of different conditions based on analysis. Change resistance are:

(1) electric hoist gantry crane luffing process was hanging items caused by non-horizontal displacement amplitude resistance;
(2) failed to fully balanced weight boom system caused by luffing resistance;
(3) the hoisting rope suspension load deflection amplitude resulting resistance of wind load, the centrifugal force, amplitude, start rotating, the brake force of inertia generated by the combined effect of the article;
(4) acting on the electric hoist gantry crane booms wind load on the system caused by the Change resistance;
(5) the  hoist crane  boom system when the centrifugal force caused by rotation amplitude resistance;
(6) Since the slope caused by the presence of crane rails luffing resistance;
(7) Change process, the boom system inertial force caused by the radial amplitude resistance;
(8) electric hoist gantry crane boom hinge shaft friction and the efficiency of compensating pulley luffing resistance caused