Double Girder Rubber-Tired Gantry Crane

A tire-type double main girder gantry crane is a mobile lifting device featuring a double box girder structure and utilizing multiple tire sets for trackless travel. It operates through the coordinated action of its hoisting, trolley travel, and gantry travel mechanisms, enabling the lifting and transportation of loads on sites without fixed tracks. Its key strengths are high mobility, substantial load capacity, and excellent site adaptability, leading to its widespread use in port terminals, logistics parks, and construction sites.

Characteristics of tire-type double-girder gantry cranes:

High mobility and flexibility: No fixed tracks required, easy to relocate, and large working range.

Strong load-bearing capacity: The double-girder structure offers high torsional and anti-eccentric load capacity, suitable for hoisting heavy and large items.

Good site adaptability: Lower ground foundation requirements compared to rail-mounted types, but requires flat and solid road surfaces.

High level of technology integration: Involves complex technologies such as multi-wheel load balancing, synchronous control, and automatic steering.

Applications of tire-type double-girder gantry cranes:

Port and container yards: Handling, stacking, and transferring containers.

Logistics parks and storage centers: Hoisting and stacking heavy packaged goods, steel materials, etc.

Industrial manufacturing and assembly: Hoisting large components in workshops for power generation equipment and heavy machinery manufacturing.

Hydropower and nuclear power construction sites: Hoisting large electromechanical equipment and building materials.

	main girders： Two parallel box girders serving as the primary load-bearing and force-bearing components, with trolley travel tracks laid on them.
	Legs: Support structures connecting the upper main girders to the lower traveling bogies.
	Lower cross girders and traveling bogies: Components connecting the bottom of the legs and installing tires, as well as driving and steering mechanisms.
	Hoisting mechanism: Composed of an electric motor, reducer, drum, wire rope pulley system, and lifting appliance, responsible for vertically lifting and lowering goods.
	Trolley traveling mechanism: Drives the hoisting trolley to move laterally along the tracks on the double main girders, positioning goods within the gantry span.
	Gantry traveling mechanism: Drives the entire crane to move longitudinally on the ground via tires. Typically employs multi-wheel, multi-motor drive and is equipped with an independent hydraulic steering system, enabling various modes such as straight travel, diagonal travel, and crab steering.