What are the classifications of gantry cranes
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- Time of issue:2021-07-28 17:40
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What are the classifications of gantry cranes
- Categories:Industry News
- Author:
- Origin:
- Time of issue:2021-07-28 17:40
- Views:
Answer: The gantry crane is a variant of the bridge crane. Mainly used for outdoor cargo yard, stock yard cargo, bulk cargo loading and unloading operations. Its metal structure is like a door-shaped frame, with two supporting feet installed under the main beam, which can walk directly on the track on the ground, and the two ends of the main beam can have outhanging cantilever beams. The gantry crane has the characteristics of high site utilization, large operating range, wide adaptability and strong versatility. In the stone industry, it is mainly used for lifting and unloading blocks.
Classification of structural forms
First, according to the structure of the door frame
is divided into gantry crane and cantilever gantry crane
Gantry crane
1. Full gantry crane: The main beam has no overhang, and the trolley runs within the main span.
2. Half portal crane: The outrigger has a height difference, which can be determined according to the civil construction requirements of the site.
Cantilever gantry crane
1. Double cantilever gantry crane: the most common structural form, the force of the structure and the effective use of the site area are reasonable.
2. Single cantilever gantry crane: This structure is often selected due to site constraints.
2. According to the main beam structure
1. Single main beam gantry crane
The single main beam gantry crane has a simple structure, is easy to manufacture and install, and has a low mass. The main beam is mostly an off-track box-shaped frame structure. Compared with the double girder gantry crane, the overall rigidity is weaker. Therefore, when the lifting weight Q≤50t and the span S≤35m, this form can be adopted. The door legs of a single main beam gantry crane have two forms: L-shaped and C-shaped. The L-shape is easy to manufacture and install, with good stress and low mass. However, the space for lifting goods through the outriggers is relatively small. The C-shaped feet are made inclined or curved, and the purpose is to have a larger lateral space so that the goods can pass through the feet smoothly.
2. Double beam bridge crane
The double-beam bridge crane has strong carrying capacity, large span, good overall stability, and many varieties, but its quality is larger than that of a single-beam gantry crane with the same lifting weight, and the cost is also higher. According to the main beam structure, it can be divided into two forms: box beam and truss. At present, the box-shaped structure is generally used. To
Three, according to the form of use
1. Ordinary gantry cranes, orbital gantry cranes
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 weight 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
4. Container Gantry Crane
Used for berth to assemble the hull, there are always two crane trolleys: one has two main hooks and runs 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 for turning and hoisting large hull sections. The lifting weight is generally 100 to 1500 tons; the span is up to 185 meters; the lifting speed is 2 to 15 m/min, and the fretting speed is 0.1 to 0.5 m/min.