What are the major considerations in the design of cranes?
Mechanical principles There are three major considerations in the design of cranes. First, the crane must be able to lift the weight of the load; second, the crane must not topple; third, the crane must not rupture.
What are the disadvantages of overhead crane?
Disadvantages of Overhead Cranes The high initial price can often be the biggest hesitation in a customer’s decision to purchase an overhead crane. Compared to a forklift, there will be a larger upfront cost when buying an overhead crane.
What is the purpose of the gantry crane system?
Where is a gantry crane used? Gantry cranes are generally used for lifting extremely heavy objects. Because of this, they are often employed during shipbuilding, where the crane straddles the ship to allow for very large jobs, such as lifting the engines into the ship.
What is a critical lift with a crane?
Critical lift means a lift that (1) exceeds 75 percent of the rated capacity of the crane or derrick, or (2) requires the use of more than one crane or derrick.
Can you walk under a crane boom?
Frequently, the victim is a laborer doing an assigned job which as nothing to do with the crane. The rule is simple: “Don’t stand, walk, or work under crane booms, buckets or suspended loads.” Prior planning of crane operations usually takes into account the area to be covered by the swing of the boom.
What is the problem of a crane?
If overhead crane is out of alignment and skewing then it can lead to significant stress and damage to whole crane system. While construction of the crane, forces applied can also cause stress in the crane and hence this type of stress can result in accidents, crane failure, productivity loss and replacement of loss.
What are the common problems on deck cargo crane?
The most common failure related to the crane is the failure of wire ropes. The steel wire ropes must be lubricated to all its length and especially in the way of sheaves when the crane is in the stowed position.
What material are gantry cranes made of?
With two A-frames, upright beams and one cross beam made from aluminium to provide strength, durability and a lightweight structure, our gantry cranes make easy work of any lifting and moving tasks you may have.
What are gantry cranes made from?
A gantry crane consists of a steel frame that has both a horizontal beam or beams (on which a hoist runs) and supporting upright columns. These columns can be static/fixed but more commonly are able to run on floor mounted rails or castor/tyred wheels.
Is a jib crane a gantry crane?
A jib crane has one point of contact from which the crane extends. A gantry crane however is anchored on both ends, with a horizontal Ibeam existing between two opposite supports (think of a swing set frame). Gantry cranes are generally mounted on wheels allowing them to be easily be rolled to different locations.
What is the difference between a gantry and bridge crane?
Bridge cranes are mounted inside of the building they operate in. This makes them great for warehouse type factories that are often crowded and where every inch of space is valuable. Gantry cranes are typically on wheels or mounted to a track system .
What is a full gantry crane?
Full gantry crane systems are the most popular configuration—consisting of two legs that ride on rail that is embedded flush with the top surface of the floor. They typically run in a straight line in a dedicated work area.
How to design a gantry crane girder?
The design of a gantry crane girder, therefore, involves the selection of a suitable and workable steel model and section to satisfy the machine (crane) requirements, loading, equipment, etc without leading to any structural or service failure. Normally, for medium-duty (say 25 to 30 t capacity) cranes, standard universal rolled I-beams are used.
What are the common problems with gantry cranes?
In a gantry crane, the failure of the trolley can spell disaster. Make sure all components are well-maintained. The height and the width of the crane affect the crane capacity.
How does a gantry system work?
Larger gantry systems may run on a rail or track embedded in the ground, typically in a straight line in a dedicated work area. Smaller portable gantry systems run on castors or wheels and can be moved about a facility for maintenance or light fabrication work. Podcast: What is a Gantry Crane? Mazzella Companies Podcast · What is a Gantry Crane?