What are the usage forms and working levels of gantry cranes?

You may be a little strange about gantry cranes. Gantry cranes are common in our lives. The operation of gantry cranes is difficult. We need to strengthen various aspects of work to ensure that the crane is in the best operating condition. Here is a brief introduction to the usage and working level of the gantry crane.

1. Application form of gantry crane:

1. Ordinary gantry crane
Rail gantry crane
This type of crane mostly adopts box-type and truss-type structures, and has the most extensive uses. It can transport all kinds of articles and bulk materials, with a lifting capacity of less than 100 tons, and a span of 4 to 39 meters. Ordinary gantry cranes with grab buckets have a higher level of work. Ordinary gantry cranes mainly refer to hook, grab, electromagnetic, hoist gantry cranes, and also include semi-gantry cranes.
2. Gantry crane of hydropower station
It is mainly used for lifting and opening and closing gates, and can also be used for installation operations. The lifting capacity is 80-500 tons, the span is small, 8-16 meters; the lifting speed is low, 1-5 meters/min. Although this kind of crane is not often lifted, it is very heavy once used, so the work level should be appropriately improved.
3. Shipbuilding gantry crane
Used for berth to assemble the hull, there are always two crane trolleys: one has two main hooks, which run on the track of the upper flange of the bridge; the other has a main hook and a secondary hook, which are on the lower flange of the bridge. It runs on the track in order to flip and hoist large sections of the hull. The lifting weight is generally 100-1500 tons; the span is 185 meters; the lifting speed is 　2-15 m/min, and the micro-movement speed is 0.1-0.5 m/min.
4. Container Gantry Crane
Rail gantry crane
Used in container terminals. After the trailer transports the containers unloaded from the quayside container carrying bridge from the ship to the yard or rear, they are stacked by the container gantry crane or directly loaded and transported away, which can speed up the turnover of the container carrying bridge or other cranes. A yard that can stack containers with 3 to 4 layers high and 6 rows wide is generally a tire type, but also a rail type. Compared with the container straddle carrier, the container gantry crane has a larger span and height on both sides of the mast. In order to meet the transportation needs of the port and wharf, the working level of this crane is relatively high. The lifting speed is 8～10m/min; the span is determined according to the number of container rows that need to be crossed, the maximum is about 60 meters, which corresponds to the lifting weight of 20-foot, 30-foot, and 40-foot containers, respectively, about 20 tons and 25 tons And 30 tons.

2. Working level of gantry crane:

The gantry crane is also the gantry crane working level A: it reflects the working characteristics of the crane in two aspects: load status and utilization.
The division of work levels is determined by the utilization level U and load status Q of the crane. They are divided into eight levels from A1 to A8. Crane working level,
That is, the working level of the metal structure is determined by the lifting mechanism, and is divided into A1-A8 level. If compared with the crane work type specified in China,
Roughly equivalent to: A1-A4-light; A5-A6-medium; A7-heavy, A8-very heavy.