do you really know about overhead gantry cranes?

Brief introduction of overhead gantry canes

The lifting mechanism, trolley drive arrangement and bridge structure of overhead gantry cranes are as same as the bridge crane.
As the span is large, most of the crane mechanism adopts the respectively driving mode to prevent additional resistance of skewed run causing by crane , even the accident. The crane carriage of overhead gantry cranes, some of which are jib type cranes, runs on the bridge. The landing legs on both sides of the bridge are rigid legs, when then span is more than 30 meters, one side is often adopted rigid leg, while the other side is the flexible leg connected by ball joint and bridge. Some bridge structure have no jib on both ends of the bridge, while they can also have a jib on one side or two jibs on the both sides, in order to expand the working range of installing the jib. As for the semi overhead gantry cranes, just one landing leg is installed on one side of it, the other side is without landing leg and runs on the high bench directly.

Characteristics of various overhead gantry cranes

There are various overhead gantry cranes according to different application.

Common overhead gantry cranes are used widely

The common overhead gantry cranes, which can handle all kinds of items and bulk materials, are a kind of widely used overhead gantry cranes. Its lifting capacity is under 100 tons and the span is 4-35 meters. What’s more, the working class of common overhead gantry cranes with grab is high.

Features of hydropower station overhead gantry cranes

The hydropower station overhead gantry cranes are mainly used for lifting, opening and closing the gate, it also carry out the installation tasks. Its lifting capacity is 80-500 tons, and the span is 8-16 meters, which is smaller than common overhead gantry cranes. The lifting speed is 1-5 meters/min, more slower than common overhead gantry cranes. Though this type of crane is not swing frequently, once worked, it will be worked more heavy. So it is certainly to improve the working class appropriately.

Large capacity of shipbuilding overhead gantry cranes

Shipbuilding overhead gantry cranes are used for assembling hulls of ship. There are two sets of trolleys on crane in stock. One set of trolley has two main hooks, running on top flange track of bridge; the other one has a main hook and secondary hook, running on bottom flange track of bridge, so that it could turn over and lift large ship body section. The lifting capacity shipbuilding overhead gantry cranes is generally 100-1500 tons, the span can up to 185 meters, and the lifting speed is 2-15 meters/min. In addition, there is 0.1-0.5 meter/min of fretting speed.

High working class of container overhead gantry cranes

Container overhead gantry cranes are used for container dock. Trailer carries the container that is unloaded from boat by quay wall container carrier bridge to storage yard or back, after doing this, the container overhead gantry cranes will stack or load away directly, so that it can speed up the turnover of container transport bridge or other cranes. The container yard with the capacity that can accommodate the container with 3-4 floor and 6 rows usually adopts a wheel type, some of them also uses a railway type. Compared with the container overhead gantry cranes with the container straddle truck, the span and both sides of gantry are larger. In order to adjust the transportation need, the working class of container overhead gantry cranes is higher. The lifting speed is 35-52 meters/min, the span can be decided according to the crossing the row of the container overhead gantry cranes. The largest span is around 60 meters. The lifting capacity of single container is about 40.5 ton. Another double container has two type specification, the lifting capacity is 61 ton and 65 ton .