The crane used in the manufacturing of ships and docks is the task of making all parts (bars, sections, steel plates, etc.) needed to make the hull.
It is conveyed to the manufacturing site from the transport equipment on the ground. This transportation work must be able to complete the task very quickly in a long journey. Therefore, the decision of the crane number is based on the principle that the foundation area of the whole dock can be reached, and the cranes are not interfering with each other.
This kind of crane has been widely used in the past, and now it is also used in small shipyards.
The existing fixed position gantry crane is a tower shaped rotary crane with fixed supports, and the sports car runs on the lower edge of the horizontal extension arm.
Since the crane is built many times around the dock, its radius of rotation is determined by its ability to work in the entire shipbuilding area.
Door shaped, across the track laid along the dock, to transport parts to the hull. The span of the door is 6 meters. This kind of crane sometimes uses a revolving prop, sometimes with a fixed support and sometimes a turntable. To change the radius of rotation, the projecting arm is usually mounted on the lower edge of the horizontal extension arm, with a sports car changing its radius of rotation.
When the running radius is changed by the sports car (the cable car), the driving mechanism of the sports car and the pushing mechanism of the hoisting mechanism are fixed at the rear part of the extended arm to enhance the balance weight.
In order to ensure the stability of the crane, a balance weight is usually required, and the balance weight is mounted on the chassis of the movable portal support.
A gantry crane, a protruding arm mounted on a prop and capable of fluctuating motion, is used for lifting motion by using the eight cable pulley block. To prevent the overhanging arm from falling too low, there should be a latch device.
In the schematic diagram of the travelling gantry rotary crane, there is a revolving prop mounted on the tower support, and the radius of rotation is changed by the running of the sports car. The load capacity is 6 tons at the rotation radius of 4.5 meters, the radius is 24 meters, and 2 tons; the hoisting height is about 26 meters; the span is 5.85 meters. Working speed: hoist: 16
M / min; sports car driving: 20 m / min; rotation: 120 m / min; lifting rack driving: 60 m / min.