Automated RMG Crane – Smart Rail-Guided Container Stacking

Rubber Tyred container Gantry crane (RTG) is a mobile gantry yard crane used for stacking intermodal containers within the stacking areas of a container terminal. RTG cranes are used at container terminals and container storage yards to straddling multiple lanes of rail/road and container storage, or when maximum storage density in the container stack is desired.

Rubber Tired Gantry container crane(RTG) is generally made up of the following unit: frame, hoisting system, minimum turing mechanism, bridge traveling and turning mechanism, trolley traveling mechanism, container spreader, diessel generator set and eletrical equipment, other aiding equipment for safety. Crane is accessible to PLC and CMMS and has sufficient power supply for lighting and communication.

Standards followed during design and manufacturing processes:
Rubber tired transtainer specification,
Test method for rubber tired gantry container crane,
Safety rules for lifting appliances,
Design rules for cranes,
Gantry crane technical requirements.
ISO standards and FEM.

By comparison with Rail Mounted Gantry container crane(RMG), RTG is better in flexibility and economy and being more adjustable to container yard. However, it shares the feature of rigid requirements of maintenance and higher expense in utility.

Rail-mounted container gantry cranes (RMG) are specialized yard container handling cranes.

RMG crane travels on rails to lift and stack 20' or 40' containers in the yard area by means of the yard power. The container is lifted by a telescopic spreader attached to cables. Rail mounted container gantry cranes come in a variety of models with different spans and overhangs.

RMG crane consists of lifting device, trolley traversing device, gantry travelling device and sway-dampening device. The lifting, gantry and trolley devices are normally equipped with AC frequency conversion control system. The lifting device is of single drum type, and it can also be designed to be double drum type if needed.

RMG cranes are specifically designed for intensive container stacking due to its automation and less need for human handling. Compared to the Rubber Tyred container Gantry crane (RTG), the RMG crane has the advantages of being driven by electrical power, cleaner, bigger lifting capacity, and higher gantry traveling speed with cargo. Rail-Mounted Gantry cranes are particularly effective for rail/road transhipments of large quantities of containers.

The following items are for user's selection according to their own needs:
* Trolley slewing mechanism. Normally the trolley can be slewed easily between -10 ~ + 190 degrees. If needed, continuous slewing can be realized.
* RMG crane with overhanging beam, which reaches beyond gantry travellling rail.
* RMG crane with different rail span and gauge.
* Two-Direction anti-sway system.

Quayside container gantry crane (also called container handling gantry quay crane, ship-to-shore crane ) is a large dockside gantry crane at container terminals for loading and unloading intermodal containers from container ships and carriers.

Quayside container gantry cranes consistent frame, hoisting system, luffing mechanism, inclining and rotating mechanism, travelling mechanism, trolley travelling mechanism and machinery house, elevator, container spreader, electrical equipment and other aiding equipment for safety. The spreader can be lowered down on top of a container and locks on to the container's four locking points, using a "twistlock" mechanism. Normally single containter can be unloaded at once, however up to four 20' containers can be handled at the same time by moden technology.

Quayside container gantry crane is driven by an operator that sits in a cabin suspend from the trolley. The trolley runs along rails that are located on top or sides of the boom and girder. The operator runs the trolley over the ship to lift the container cargo. once the spreader latches (locks) on to the container, the container is lifted and moved over the dock and discharged on a truck chassis or trailer to then be taken to the storage yard. Containers can also be lifted from the chassis to store (load) them on to the ship.

Stands followed during design and manufacturing processes:
Specification of Quayside container crane,
Test method for Quayside container crane,
Safety rules for lifting appliances,
Design rules for cranes,
ISO standards and FEM.

Grab type Ship Unloader has the utility of unloading enormous bulk cargos in docks and has the main features of big unloading capacity and of being able to unload various cargos, which has good adjustability to different size of ships.

Grab ship unloader comprises of steel structures, hoisting and closing mechanism, trolley travelling mechanism, luffing mechanism, travelling mechanism, machinery house, lift, grab, dust preventing system, electrical equipment, and necessary safety and aid devices. Reducer and four linked drums can be applied to the trolley travelling mechanism as well as hoisitng and closing mechanism which are also accessible to PLC frequency changeable, digital speed altering system and CMMS. Therefore the two above systems have the function of analysis, monitor and efficient power supply of communication and illumination. Also, the grab can be equipped with electronic anti-swaying system

Steel structure has a diversity of different types such as single and double box girder, truss boom, arm boom and H gantry frame.

Standards during design and manufacturing processes:
Specification of Quayside crane,
Safety rules for lifting appliances,
Design rules for cranes,
ISO Standards and FEM.