Portal crane: types and characteristics
The portal crane has the form of a special crane, the swiveled platform of which is installed on a high pedestal, and the movement mechanism itself moves along the rails. Such devices are often used in shipyards, as well as in ports and ship docks. The main principle of operation of cranes is to capture and move large-scale cargo. Directly crane portal itself consists of legs, as well as the tip. The crane in the port is able to lift and move large-scale cargoes weighing from 5 to 300 tons.
Gantry crane device
The portal crane has a base with a driving mechanism capable of rotating around its axis. Since this type of lift is capable of performing various functions, namely the movement of various types of cargo, it can be equipped with various types of grippers, such as a hook or a clamshell. Depending on the place of their location and the functions they perform, the cranes can be construction and installation.This kind of equipment has a lot of positive characteristics, and also easily moves from place to place.
Types of gantry cranes
Portal crane is of several types and varieties, each of them has its own purposeful purpose.
The dock crane in comparison with similar models of cranes has a rather low carrying capacity, which in many respects does not correspond to its intended purpose. This crane is protected from unforeseen overturning, and it also has the function of anti-angle grips.
The reloading crane is able to lift more weight in comparison with the previous one, namely about 30 tons. In some cases, such a lift can be equipped with a special magnet (for lifting metal parts), as well as with a hook or grapple (for moving bulk cargo). On such a crane in most cases there is a winch or more for the insurance of the goods being moved.
The erection crane is used in ports, as well as at ship repair or shipbuilding enterprises. Outwardly, such a crane is almost identical to the previous one, only it is capable of lifting loads, the mass of which can reach 160 tons, and several winches are also used for insurance.
A crane located in a port usually has several working mechanisms. The mobile crane mechanism is an installation function, and all the others are working mechanisms. Depending on the installation location, the cranes are divided into various types according to their application; they can perform both the overload function and the support and capture function of the large-scale cargo. The mobile mechanism is a collection of carts, which, in turn, can be driven and non-driven species. The cranes used in the port are very light and economical, they are also able to withstand the lowest possible temperatures, namely -45 degrees. Regardless of their intended purpose and name, such cranes are often used in the oil and gas industry, as well as in the timber and coal industries. Departure boom portal crane can reach 40 meters.
Characteristics of portal cranes are reflected in the direct name of the crane. For example, the portal crane “Ganz 5 / 6–30–0.5” has the following characteristics:
- load capacity hook, depending on the departure, smoothly varies from 5 to 6 tons;
- maximum departure - 30 m;
- portal gauge 0.5 m.
It is advisable to use this lift in construction and agriculture, since its capacity is not so large.
Types of gantry cranes
Depending on the conditions of use, the cranes are divided into two types - floating and onshore. Floating cranes are used directly on the water and represent the same vessel, only with a lifting mechanism. Gantry cranes, the technical characteristics of which involve the elimination of damage and accidents that occurred in the water area, as well as near land, are floating.
Coastal cranes include all those located on land, regardless of whether they are in port, dock or ship repair yard. Such cranes are used to lift all types of cargo, reaching a weight of 300 tons.