Abstract

The fastenings of steel cables for loading containers are subjected to high degrees of stress, resulting in the use of robust screw-type jaws. The systems currently installed on such cranes for fixing cables are fixed screw-type jaws. This is a much more versatile and flexible system that is based on a wedge mechanism that allows automatic and instantaneous (remotely controlled) actuation. The assembly includes the sliding clamps, actuation of said clamps, necessary additional guides and a tensioning device for adjustment of the cables. This solution makes it possible: to carry out the cable-change operation with the boom raised, thus allowing manoeuvring of the vessels and operation of nearby cranes; to reduce cable-replacement times; and to use the anchoring element (clamps) + tensioning device as a mechanism for adjusting the length of the branches. It is possible instantaneously to correct possible spreader misalignments.automatic system for guiding, retaining and adjusting cablesautomatic system for guiding, retaining and adjusting cables

IPC Classes  ?

• B66D 5/26 - Operating devices pneumatic or hydraulic
• B66C 1/10 - Load-engaging elements or devices attached to lifting, lowering, or hauling gear of cranes, or adapted for connection therewith for transmitting forces to articles or groups of articles by mechanical means
• B66C 1/66 - Load-engaging elements or devices attached to lifting, lowering, or hauling gear of cranes, or adapted for connection therewith for transmitting forces to articles or groups of articles by mechanical means comprising article-engaging members of a shape complementary to that of the articles to be handled for engaging holes, recesses, or abutments on articles specially provided for facilitating handling thereof

IPC Classes  ?

• B66C 1/00 - Load-engaging elements or devices attached to lifting, lowering, or hauling gear of cranes, or adapted for connection therewith for transmitting forces to articles or groups of articles
• B66C 19/00 - Cranes comprising trolleys or crabs running on fixed or movable bridges or gantries

Abstract

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.

IPC Classes  ?

• B66C 13/06 - Auxiliary devices for controlling movements of suspended loads, or for preventing cable slack for minimising or preventing longitudinal or transverse swinging of loads