Rubber tyred container gantry crane, abbreviated as RTG, is a special machine for large specialized container yard, loading and unloading standard containers. It is not only suitable for the storage yard of container terminal, but also suitable for the special storage yard of container.
The field bridge is powered by diesel engine AC generator set, which adopts digital frequency conversion speed regulation, and can move in two directions in the container field. Equipped with a retractable sling capable of lifting 20 foot, 40 foot containers. Fixed guide plate is often used as the lifting device of the field bridge. In order to reduce the swing of the spreader, a mechanical anti sway device is installed. In order to facilitate the case, a small angle rotation device of the spreader is installed. In order to be able to change the site operation, a right angle steering mechanism of 00-900 is provided. In general, the span of field bridge has been standardized to 23.47m (six lines plus walkways), and non-standard span field bridge can also be supplied. The lifting height can ensure to lift a 40 foot long 9’6 “container over four (or five to six) layers of stacking.
The field bridge is supported on a large tubeless tyre with 4, 8 or 16 wheels. The number of wheels is designed according to the requirements of the site wheel pressure. The crane traveling mechanism can be driven by four or two wheels. In order to prevent the collision between the field bridges and between the field bridges and containers, a manual deviation correction system and a four corner collision prevention device are provided.
The trolley running machine can be driven by rack type or double axle or single axle, and the running is stable. A cab is arranged under the trolley frame, in which the driver operates the whole crane.
The field bridge adopts AC or DC speed control system, which has good speed control and constant power control, and can automatically adjust the lifting speed according to the weight of the box.
Safety Measures
In terms of safety facilities, there are signal devices such as overload protection, diesel engine over-speed protection, high water temperature and low oil pressure, wind speed indicator, anti typhoon anchoring device, emergency stop button, limit switch and signal indication of various mechanisms, etc.
In addition, ZPMC can also choose DGPS (satellite automatic positioning system), ECMS, RCMS (fault display and contact system with the central control room), crane jacking device which is convenient for turning and reducing tire wear, boarding elevator and other equipment on RTG.
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