Hydraulic Motors for Actuating and Controlling an Anti-Swing System in Container-Handling Granes

摘要

The invention relates to hydraulic motors for actuating and controlling an anti-swing system in container-handling cranes. Container-handling cranes pose the following problem, namely that, when the trolley moves, the cables supporting the load spreader oscillate longitudinally in relation to the aforementioned movement. Systems currently used to reduce said swinging movement are inconvenient because (i) they comprise numerous power transmission elements, thereby generating maintenance problems, and (ii) the main two functions thereof are performed separately, i.e. movement transmission and oscillation reduction. The aforementioned problems can be resolved with an autonomous, independent drive system using hydraulic motors, thereby rendering the power transmission drive chain simple, robust, reliable and easy to maintain. In addition, the motors perform the main functions simultaneously, i.e. producing the movement and reducing the oscillations. According to the invention, pressure-limiting devices are used to dampen the pressure points applied to the motors during the swinging movement. The system balances the pressure on the motors and, in this way, offsets the oscillating movement.