Universal Lifting and Travelling Double Girder Gantry Crane for Sale

The double girder gantry crane is a heavy-duty lifting solution specifically designed for handling large and bulky cargo in demanding industrial environments. With its robust double-girder and gantry structure, the crane offers exceptional lifting capacity, a stable operating platform, and reliable long-term performance. It is equipped with precision trolleys and advanced electrical systems, ensuring smooth, efficient, and precise material handling across various applications.

Featuring a large span, adjustable lifting height, compact structure, and flexible operation, the double girder gantry crane achieves strong load-bearing capacity and high site utilization. This makes it suitable for a wide range of operations, including ports, shipyards, factories, warehouses, and large outdoor storage yards. For outdoor applications, the crane can also be equipped with safety and protective devices such as rail clamps, anchoring devices, cable anchoring systems, and wind speed or wind direction meters to ensure safe and stable operation under different weather conditions.

Compared with single girder cranes, the double girder gantry crane provides higher lifting capacities, more complex configurations, and greater adaptability to heavy-duty and continuous operations. It is particularly suitable for lifting extremely heavy loads, working in severe conditions, or meeting other special operational requirements. With maximum lifting capacities reaching up to 320 tons in our projects, the design parameters such as span, lifting height, and working duty can be tailored to meet diverse industrial needs.

At our company, we prioritize quality and safety over low pricing strategies. Every double girder gantry crane is manufactured with strict standards to ensure reliability, durability, and operator safety. With these strengths, the double girder gantry crane has become an essential piece of equipment in modern industrial production and logistics handling.

Girders: The main girders are heavy-duty box or truss beams made from high-strength structural steel (for example, Q345B or equivalent). Double girder design is standard for 40 t capacity, providing stiffness and strength. Box girders offer a compact, sturdy form; truss girders (used on our Truss Gantry models) reduce weight for very long spans. Girders are precisely welded and stress-relieved to minimize deformation. The span (distance between legs or wheels) and girder height are engineered per the load and duty class. End trucks connect to the girders and house the wheelsets for crane travel.

Trolley and Hoist: The trolley (or crab) runs on rails atop the girders and carries the hoisting mechanism. For 40 t capacity, we typically use a wire-rope hoist with robust gearbox and motor. The hoist includes a steel wire rope reeved on drum, multi-plate friction brake, and block with heavy hook. In some designs a twin-hoist trolley (two hoists on one girder) is available for long-span lift distribution. The hoist speed and torque meet the crane’s duty rating (for example, FEM/ISO ratings). Limit switches for upper/lower travel protect against over-hoist or over-lower. All hoists are designed to ISO and CMAA standards, and the wire rope meets ISO 4309 (inspection and care). The trolley frame is welded steel, and wheels are profiled steel with sealed bearings.

Legs and Supports: For rail-mounted cranes, the leg frames are rigid box-section columns, precisely aligned to the runway beams. Flexible-leg design is available to adjust for minor runway misalignment. Each leg carries drive motors (end trucks) and wheels that roll on the rails. The legs are braced to the girders for stability. For RTG cranes, the “legs” are the massive portal frame columns with large pneumatic tires. RTG legs house hydraulic cylinders that steer the wheels and support the bridge. All leg structures are painted with industrial coatings for weather protection (e.g. outdoor anti-corrosion paint).

Drives and Motors: Each end truck is powered by an AC motor coupled to a gearbox for smooth crane bridge travel. The trolley travel also uses a motor and gearbox (separate from bridge drives). Motors have the required power (often up to tens of kW) and are matched to the duty cycle. For rubber-tyred cranes, diesel engines with hydraulic drives can propel the crane (standard on many RTGs), or we offer all-electric RTGs (with onboard generator or battery). All motors have industrial insulation and IP ratings (commonly IP54 or better). Variable Frequency Drives (VFDs) are often used for fine speed control and energy savings on bridge and trolley travel.

Electrical System: The crane’s electrical control system is centralized in a floor-mounted or wall-mounted panel, built to IEC standards. Controls include start/stop and direction for hoist, trolley, and bridge motions. Power supply options include conductor bar (busbar), cable reel (festoon system), or external connections (for RTG cranes). Control methods can be a push-button pendant station, a cabin operator console, or a wireless remote control. Safety circuits use industrial contactors and relays, and optional PLC control is available for automation (for example, programmable anti-collision control between cranes). Emergency stop circuits are redundant. The system includes electrical protection devices (fuses, overload relays) and grounding per OSHA/ANSI requirements.

Safety Devices: Our 40 Ton Gantry Cranes incorporate multiple safety devices. These typically include overload protection (load cells or limiting devices) to prevent lifting beyond rated capacity; upper/lower limit switches to stop the hoist travel at end positions; bridge travel limit switches to prevent overrunning the runway; emergency stop buttons accessible to the operator; and protective guards around moving parts. Anti-collision devices (radar or laser sensors) can be fitted on container cranes to avoid contact between adjacent cranes. Optional features include anti-sway control (to damp load swing) and camera-vision systems. All safety devices are tested during commissioning, and circuitry meets OSHA and ASME safety code requirements.