The generally accepted definition of a crane is a machine for lifting and moving heavy objects by means of ropes or cables suspended from a movable arm. As such, a lifting machine that does not use cables, or else provides only vertical and not horizontal movement, cannot strictly be called a crane .

 

A loader crane (also called a knuckle-boom crane or articulating crane) is a hydraulically powered articulated arm fitted to a truck or trailer, and is used for loading/unloading the vehicle. The numerous jointed sections can be folded into a small space when the crane is not in use. One or more of the sections may be telescopic. Often the crane will have a degree of automation and be able to unload or stow itself without an operator s instruction.

Unlike most cranes, the operator must move around the vehicle to be able to view his load; hence modern cranes may be fitted with a portable cabled or radio-linked control system to supplement the crane-mounted hydraulic control levers.

 

In the UK and Canada, this type of crane is almost invariably known colloquially as a "Hiab", partly because this manufacturer invented the loader crane and was first into the UK market, and partly because the distinctive name was displayed prominently on the boom arm.

 

A rolloader crane is a loader crane mounted on a chassis with wheels. This chassis can ride on the trailer. Because the crane can move on the trailer, it can be a light crane, so the trailer is allowed to transport more goods.

 

Construction cranes have either telescoping, lattice or articulating booms. Telescoping boom cranes include the Industrial, Rough Terrain, Truck Mounted, All Terrain and City Cranes. Lattice boom cranes include the Crawler Mounted, Truck Mounted, Ringer Mounted and Hammerhead and Luffing Boom tower cranes. Articulating boom cranes are mounted on commercial trucks and can have telescoping boom sections and hoists. Railroad Track and Floating Cranes can be either telescoping, lattice or articulating boom.

 

Mechanical principles

There are two major considerations that are taken into account in the design of cranes. The first is that the crane must be able to lift a load of a specified weight and the second is that the crane must remain stable and not topple over when the load is lifted and moved to another location.

 

Our main products include telescope boom and knuckle boom cranes. Lifting capacity from 1T to 25T. Model: SQ1ZK2Q, SQ2ZK1, SQ3.2ZK1, SQ3.2ZK2, SQ4ZK2, SQ2SK2Q, SQ4SK2Q, SQ3.2SK1Q, SQ3.2SK2Q, SQ5ZK2Q, SQ6.3ZK2Q, SQ8ZK3Q, SQ6.3SK3Q, SQ5SK2Q, SQ6.3SK2Q, SQ5SK3Q, SQ10ZK3Q, SQ16ZK4Q, SQ10SK3Q, SQ12SK3Q, SQ16SK5Q, SQ25ZK6Q, SQ25SK2.

There are 3T and 5T Forestry Cranes, model is LSQ3, LSQ5, which have a knuckle boom and can be used for lifting block, timber or steel rend.