Chinese Double Girder Double Hook Gantry Crane 50/10t: A Technical Overview by Dongqi Crane

1 Product Introduction

The 50/10-ton double girder double hook gantry crane represents a class of robust and versatile lifting solutions engineered for demanding industrial applications. As a leading manufacturer in the global crane industry, Dongqi Crane has designed this crane model to address the material handling needs of various sectors where efficient lifting operations and reliable performance are paramount. This crane, also referred to as a goliath crane, is particularly suitable for applications where overhead runways are impractical or in open areas where supporting columns cannot be accommodated.

Dongqi’s 50/10t double girder gantry crane features a robust structural design with the main girder mounted on two A-shaped columns that rest on wheel-mounted end carriages. This configuration provides exceptional stability and load-bearing capability while covering substantial work areas without the need for extensive warehouse infrastructure. The crane’s primary technical parameters include a lifting capacity of 50 tons for the main hook and 10 tons for the auxiliary hook, span capabilities ranging from 10 to 40 meters, and a lifting height of up to 30 meters. With a typical working class of A5/2M, this crane is designed for moderate to heavy-duty cycling operations while maintaining consistent performance.

The fundamental design philosophy behind Dongqi’s 50/10t gantry crane centers on delivering practical functionality and operational efficiency through carefully engineered components and configurations. Each element—from the box-type welded construction of the main girder to the strategically selected travel mechanisms—has been optimized to ensure reliable performance in diverse working environments, including outdoor applications where exposure to environmental elements necessitates enhanced durability and corrosion resistance.

2 Design Characteristics and Structural Advantages

2.1 Structural Design and Mechanical Performance

The structural integrity of Dongqi’s 50/10t double girder gantry crane begins with its main girder system, fabricated from high-quality Q235/Q345 carbon structural steel using advanced welding techniques such as submerged-arc welding. This construction method results in superior weld penetration and consistent quality, creating a girder system with exceptional resistance to deformation under load. The box-type design provides inherent torsional rigidity while maintaining an optimal balance between material usage and structural strength. This engineering approach yields a girder system capable of withstanding the dynamic stresses encountered during routine lifting operations, ensuring long-term performance with minimal deflection.

The crane’s A-shaped support legs represent another critical structural element, delivering enhanced stability and optimal load distribution throughout the crane’s framework. This design configuration effectively transfers lifting forces to the end carriages and subsequently to the track system, minimizing stress concentration points that could compromise long-term structural integrity. The support legs are engineered to resist the complex forces generated during simultaneous lifting, traversing, and travel motions, ensuring smooth operation across the crane’s entire working range.

2.2 Hoisting and Travel Mechanisms

The hoisting system incorporates a professionally engineered winch mechanism with a dual-speed capability for precise load control. The main hoist for the 50-ton capacity features a lifting speed of 5.9 m/min, while the auxiliary 10-ton hoist operates at higher speeds suitable for lighter loads. This combination provides operational flexibility, allowing operators to select the appropriate hoist based on load weight and precision requirements. The hoisting motors, such as the YZR series specifically designed for crane applications, deliver reliable power output with thermal protection features to prevent overheating during intensive operation.

The travel mechanism utilizes a “tree-in-one” design that integrates the motor, reducer, and brake system into a compact, high-efficiency unit. This configuration simplifies maintenance while ensuring synchronized movement and consistent performance across all travel functions. The crane traveling speed is rated at 30 m/min, while the trolley traversing speed reaches 38.4 m/min. These speed parameters have been strategically selected to balance operational efficiency with precise load positioning, particularly important when handling valuable or delicate loads.

Table: Key Design Features of Dongqi 50/10t Double Girder Gantry Crane

Component	Design Feature	Performance Benefit
Main Girder	Box-type welded construction using Q235/Q345 steel	High vertical and horizontal rigidity with minimal deflection
Support Legs	A-shaped configuration	Enhanced stability and optimal load distribution
Hoisting System	Dual-hoist design (50t main + 10t auxiliary)	Operational flexibility for varying load requirements
Travel Mechanism	“Tree-in-one” integrated drive system	Simplified maintenance and synchronized movement
Power Supply	3AC 220-480V 50/60Hz compatibility	Adaptable to various regional power standards

2.3 Customization and Adaptability

Dongqi’s 50/10t gantry crane offers substantial customization potential to address specific operational requirements. The crane can be tailored with varying span lengths, lifting heights, and speed parameters based on application needs. This flexibility extends to the electrical systems, where components from recognized international brands like Siemens or Schneider can be incorporated to ensure compatibility with existing infrastructure and simplified maintenance through globally available parts.

The crane’s adaptability to diverse environments is evidenced by its capability to operate in temperature ranges from -20°C to 40°C (with options extending to -25°C to 50°C for specific configurations). This makes the equipment suitable for installation in various climatic conditions without compromising performance. For specialized applications, additional features such as insulated crane hooks for charged environments, explosion-proof configurations for hazardous areas, or corrosion-resistant treatments for high-humidity conditions can be implemented to address specific operational challenges.

3 Application Scenarios and Configuration Flexibility

3.1 Industrial Applications

The versatile nature of Dongqi’s 50/10t double girder double hook gantry crane makes it suitable for diverse material handling applications across multiple industries. In steel warehouses and metal production facilities, the crane’s robust construction enables efficient handling of heavy coils, sheets, and structural components. The dual-hook configuration provides particular advantages in this context, allowing operators to use the main hook for heavier loads while employing the auxiliary hook for simultaneous preparation of lighter materials, significantly improving workflow efficiency.

For precast concrete yards and construction material storage, the crane’s ability to operate without extensive fixed infrastructure delivers substantial benefits. The gantry design enables direct access to storage areas and loading bays, facilitating efficient movement of heavy concrete elements, piping, and structural components. The outdoor capability of the crane makes it ideal for these applications, with weather-resistant features ensuring consistent performance despite exposure to environmental elements.

In renewable energy and heavy equipment sectors, the crane demonstrates exceptional utility in handling oversized components such as wind turbine parts, large machinery assemblies, and industrial equipment. The clear span capability and generous lifting height allow for maneuvering of bulky items that would be challenging for other material handling systems. The precise load control afforded by the dual-speed hoisting system enables careful positioning of high-value components during assembly operations, reducing the risk of damage and improving installation accuracy.

3.2 Configuration Options

Dongqi offers several configuration variants of the 50/10t gantry crane to address specific application requirements. The standard configuration includes the MG-type double girder design with A-shaped support legs and dual trolley system. This configuration provides balanced performance for general industrial applications with its 30-meter lifting height and span options extending to 40 meters.

For applications requiring extended coverage or operation in areas with spatial constraints, cantilever configurations with extension lengths ranging from 5 to 15 meters are available. These designs incorporate reinforced saddle components to maintain structural rigidity despite the increased moment forces introduced by the cantilevered sections. This configuration proves particularly valuable in storage yards where materials must be accessed beyond the immediate track area or when transferring loads between processing areas and transport vehicles.

Specialized configurations include the U-type design featuring widened support legs that facilitate handling of exceptionally wide loads without interference from the leg structure. This variant finds application in hydropower stations and heavy fabrication facilities where large-dimension components are commonplace. For operations where weight optimization is critical, such as temporary installations or sites with ground bearing limitations, a truss-type design offers reduced自重 while maintaining structural integrity through strategically positioned reinforcing elements.

4 Technical Parameters and Performance Specifications

4.1 Comprehensive Technical Specifications

The technical foundation of Dongqi’s 50/10t double girder double hook gantry crane is defined by a comprehensive set of performance parameters and engineering specifications. The crane’s primary capacity rating of 50 tons for the main hook and 10 tons for the auxiliary hook establishes its position in the mid-to-heavy-duty range of lifting equipment. This capacity distribution enables the simultaneous handling of primary loads and preparatory materials, significantly enhancing operational efficiency in appropriate applications.

The span capability of 10-40 meters provides substantial coverage for most industrial applications, with the specific span selection dependent on facility layout and operational requirements. The lifting height of up to 30 meters enables the crane to service multi-level storage configurations and handle tall loads commonly encountered in heavy industries. This parameter can be customized based on specific operational needs, with Dongqi offering both standard and special lifting heights to match application requirements.

The motion control system incorporates precisely calibrated speeds for each operational function. The main hoisting speed of 5.9 m/min provides controlled lifting of maximum loads, while the trolley traversing speed of 38.4 m/min and crane travel speed of 30 m/min balance positioning efficiency with operational safety. These speed parameters have been engineered to minimize load swing while maintaining efficient cycle times, contributing to both productivity and safety.

Table: Technical Parameters of Dongqi 50/10t Double Girder Gantry Crane

Parameter	Specification	Notes
Lifting Capacity	50t (main) / 10t (auxiliary)	Suitable for wide range of industrial loads
Span	10-40 meters	Customizable based on application needs
Lifting Height	Up to 30 meters	Sufficient for most industrial applications
Lifting Speed	5.9 m/min (main hook)	Controlled lifting for heavy loads
Trolley Speed	38.4 m/min	Efficient traversing for improved cycle times
Crane Travel Speed	30 m/min	Balanced speed for safety and productivity
Work Duty	A5/2M	Suitable for moderate to heavy-duty cycles
Number of Wheels	8	Distributed load bearing
Maximum Wheel Pressure	288-375 KN	Determines rail specification requirements
Recommended Rail	QU70	Adequate for load distribution
Power Supply	3AC 220-480V 50/60Hz	Compatible with various power systems

4.2 Safety and Control Systems

The integrated safety systems in Dongqi’s 50/10t gantry crane represent a comprehensive approach to equipment and personnel protection. Standard safety features include overload protection devices that automatically prevent lifting attempts beyond rated capacity, travel limit switches that prevent over-travel at track ends, and height limit switches that restrict hook movement beyond safe upper and lower positions. These fundamental protections are complemented by hook safety latches to prevent load disengagement and rubber buffers to absorb energy during potential contact situations.

The control system architecture offers multiple operation modes to suit different application requirements and user preferences. Standard options include ground-operated pendant control, radio remote control, and enclosed operator cabin configurations. Each control method provides complete access to all crane functions while incorporating safety interlocks and emergency stop capabilities. The cabin option, available with climate control features, separates operators from potentially harsh environments while providing optimal visibility of lifting operations.

For specialized applications, additional safety configurations can be implemented, including anti-collision systems for multiple crane installations, approach detection for restricted areas, and wind speed monitoring for outdoor installations. These enhanced safety features demonstrate Dongqi’s commitment to comprehensive risk management through engineered solutions that address both standard and application-specific hazards.

5 Service and Support

5.1 Technical Support and Project Management

Dongqi Crane’s service philosophy extends beyond equipment supply to encompass comprehensive technical support throughout the project lifecycle. The company maintains a dedicated engineering team comprising over 80 management and technical personnel, including more than 20 specialized engineers. This technical resource enables Dongqi to provide expert guidance during project planning, including site-specific recommendations for crane configuration, foundation requirements, and integration with existing infrastructure.

The project management process at Dongqi follows a structured approach from initial inquiry through final commissioning. Upon receiving project specifications, the technical team conducts a detailed requirements analysis to determine the optimal crane configuration for the application. This process includes evaluating factors such as operational intensity, environmental conditions, and integration requirements with existing material handling processes. The outcome is a customized technical proposal complete with layout drawings, performance specifications, and implementation timeline.

For international projects, Dongqi provides comprehensive logistics management, handling all aspects of packaging, documentation, and transportation to the designated port or project site. The company’s extensive experience with export procedures ensures smooth customs clearance and timely delivery, with the capability to coordinate shipments to diverse global destinations. This end-to-end project management capability provides clients with a simplified procurement process and single-point accountability for complex equipment supply projects.

5.2 Installation Guidance and Commissioning Support

The installation phase represents a critical component in ensuring optimal crane performance and longevity. Dongqi provides detailed installation manuals, foundation drawings, and step-by-step erection guidelines to facilitate proper equipment installation. For clients requiring hands-on assistance, the company can deploy experienced installation engineers to supervise the erection process, verify alignment and assembly, and conduct initial operational tests. This support helps ensure that the crane is installed according to design specifications and prepared for reliable operation.

The commissioning process includes comprehensive performance verification against established technical parameters. Dongqi’s commissioning specialists conduct thorough testing of all safety systems, operational functions, and performance metrics to ensure compliance with project specifications. This includes verification of limit switch functionality, brake performance assessment, structural integrity confirmation, and control system calibration. The commissioning documentation provided to clients serves as a baseline for future maintenance reference and regulatory compliance.

5.3 Maintenance and Lifecycle Support

Dongqi’s commitment to long-term equipment performance is demonstrated through comprehensive after-sales support programs. The company provides maintenance documentation including recommended spare parts lists, lubrication schedules, and inspection checklists to facilitate proper equipment care. This proactive maintenance approach helps maximize equipment availability while minimizing unexpected downtime through systematic component monitoring and preventive replacement of wear items.

The technical support capability includes responsive assistance for operational questions or troubleshooting needs. Dongqi maintains a 24/7 support system to address urgent technical issues, with remote assistance capabilities that often enable rapid resolution of electrical or control system concerns. For situations requiring physical intervention, the company can dispatch technical specialists to customer sites to diagnose and resolve more complex equipment issues, minimizing operational disruption.

The warranty coverage for Dongqi’s 50/10t gantry crane typically spans 12 months from equipment acceptance, providing protection against manufacturing defects or component failures. Beyond the warranty period, the company continues to provide technical support and spare parts services throughout the equipment’s operational life. This long-term perspective on customer relationships ensures ongoing support for maintenance, upgrades, and operational optimization as requirements evolve over time.

6 Conclusion

Dongqi’s 50/10-ton double girder double hook gantry crane represents a technically advanced solution for diverse material handling challenges across industrial sectors. Through its robust structural design, precise control capabilities, and adaptable configuration options, this crane model delivers reliable performance in demanding applications while maintaining operational safety and efficiency.

The crane’s comprehensive technical specifications, including its 50-ton main lifting capacity, 10-ton auxiliary capability, and up to 40-meter span, position it as a versatile material handling solution for facilities requiring heavy lifting capability across extensive work areas. The integration of premium components, compliant safety systems, and multiple control options further enhances its value proposition for industrial users seeking equipment that combines performance with durability.

Backed by Dongqi’s extensive engineering expertise and comprehensive service support, the 50/10t double girder double hook gantry crane offers a dependable lifting solution capable of addressing both current operational requirements and future challenges through adaptable design and configurable features. This combination of technical excellence and application flexibility makes it a strategically sound investment for organizations seeking to enhance their material handling capabilities with equipment designed for long-term performance.