20t Double Girder Gantry Cranes: High-Span Structural Stability for Outdoor Steel Yards
Outdoor steel yards and steel structure processing sites generally face the difficult working conditions of long-span operations, heavy-duty material hoisting, and all-weather open-air construction, and have extremely high requirements for crane carrying capacity, structural stability, and environmental adaptability.Relying on high-quality double-girder structure design, the 20t double-girder gantry crane has strong bearing capacity, deformation resistance, and excellent wind and weather resistance. It can stably complete the transportation and loading and unloading of heavy steel such as steel plates, steel components, and profiles, and effectively solve the problems of shaking, deformation, and poor safety in long-span floating operations. It is the core main lifting equipment for steel yards to improve operating efficiency, ensure construction safety, and reduce operation and maintenance losses.
Why Choose a 20t Double Girder Gantry Crane for Steel Yards?
Heavy load handling
The core pain points of steel yard operations are large material loads, high density, and complex hoisting conditions. Ordinary light cranes cannot meet the needs of high-frequency and heavy-duty operations.The rated load of Henan Mine Crane manufactured 20t double-girder gantry crane is accurately adapted to the mainstream hoisting needs of small and medium-sized steel yards, and can stably carry heavy-duty materials such as steel plates, steel coils, shaped steel, and prefabricated steel components. It is compatible with continuous operation at full load and complex working conditions such as partial load and intermittent heavy load.
The crane adopts a double-main beam box load-bearing structure, with a professional load balancing design, and optimized calculations by finite element mechanics to effectively disperse the single-point lifting pressure and eliminate the deformation, sagging, fatigue damage and other problems of the main beam caused by long-term heavy-duty operations.Different from the short board of single-girder cranes with insufficient bearing capacity and severe heavy-duty shaking, the 20t double-girder gantry crane can achieve smooth lifting, translation, and positioning of the rated load of 20 tons, with high positioning accuracy and large operating fault tolerance. It is perfectly adapted to the large-volume and high-intensity hoisting operation rhythm of the steel yard, greatly improving the efficiency of material turnover.
Outdoor operating conditions
The outdoor steel yard is not shaded by a closed factory building, and faces harsh working conditions such as high winds, heavy rains, high and low temperatures, sand and dust, and large temperature differences between day and night all year round. The weather resistance, environmental adaptability, and operating stability of the crane are extremely demanding.Ordinary indoor crane modification equipment is prone to paint corrosion, loose structure, electrical failure, wind shaking and other problems, which not only affects production, but also has major safety risks.
The 20t double-girder gantry crane is specially customized and optimized for outdoor open-air scenes. The whole machine adopts Q345B high-strength structural steel and is processed by automatic submerged arc welding process to eliminate residual welding stress and has excellent deformation, corrosion and fatigue resistance.The equipment is adapted to a wide temperature operating environment from -20℃ to 40℃, and is equipped with outdoor special waterproof, dustproof, and lightning-proof electrical systems. All wiring ports and control boxes are sealed and protected to resist outdoor sand, dust and rain erosion.At the same time, the operating logic is optimized for different working conditions of outdoor windless, light breeze, and strong wind, and the operation is stable at low speed and stable at high speed. It completely solves the pain points of easy failure, poor stability, and high failure rate of outdoor equipment, and realizes uninterrupted operation all year round.
Double girder advantages
The double-beam structure is the core advantage of Henan Mine Crane manufactured20t gantry crane for long-span and high-stability operations in steel yards, and it is also a key highlight that distinguishes it from single-beam gantry cranes.The single-girder crane has a thin structure and insufficient rigidity. It is prone to tremor of the main beam and shaking of the fuselage during long-span operations, which cannot meet the precise hoisting needs of heavy steel, and long-term use is prone to structural aging, deformation and failure, and its service life is greatly shortened.
The symmetrical box structure design of the double main beam greatly improves the bending, torsional and deformation resistance of the whole machine, and the structural rigidity and overall stability are doubled and upgraded.Under the same span conditions, the double-beam equipment runs more smoothly and the load distribution is more uniform, which can support longer site span coverage and adapt to the global operation needs of large steel yards.At the same time, the double-beam structure reserves sufficient equipment installation space, and can be equipped with upgraded configurations such as double hoists, frequency conversion speed regulation, intelligent limit, and remote control, which have greater operational flexibility and functionality.In terms of service life, safety factor, and operation and maintenance convenience, the double-beam models far exceed the single-beam equipment of the same specification, and are a cost-effective choice for long-term stable production in outdoor steel yards.
Key Structural Features of a 20t Gantry Crane
Main girder design
The main beam is the core load-bearing component of the Henan Mine Crane manufactured 20t double-girder gantry crane, which directly determines the long-span carrying capacity and operating stability of the equipment.The crane adopts the national standard high-strength box-shaped double main beam structure, abandoning the traditional simple welding process, and is integrated by automatic submerged arc welding. The welds are uniform and dense, and the structural integrity is extremely strong, so as to avoid hidden dangers such as cracking and desoldering of the main beam from the root cause.
In the production stage, the precise upper arch of 1.2‰ will be preset according to the crane span, which will perfectly offset the downward deflection deformation caused by heavy-duty hoisting, ensuring that the main beam remains horizontal during full-load operation, and eliminating material shaking and hoisting offset problems.At the same time, reinforced ribs and reinforced partitions are added inside the main beam to further enhance the rigidity of the structure and effectively resist the torque, pressure and wind impact in long-span operations.The surface of the main beam has undergone dual treatment of rust removal and anti-corrosion spraying, which is resistant to outdoor corrosion and wear resistance. It is not easy to rust and age during long-term open-air operations, which greatly extends the service life of the equipment and reduces the cost of late maintenance.
Leg and support structure
The outriggers and support structure are the key structures to ensure the stability of the long-span Henan Mine Crane manufactured gantry crane and resist the interference of outdoor external forces.The 20t double-girder gantry crane adopts a standardized U-shaped/tubular reinforced outrigger design with an integrated welded base. The structure has strong load-bearing capacity and uniform force, which can perfectly withstand the heavy-duty pressure transmitted by the main beam and the outdoor horizontal wind.
The outriggers adopt segmented reinforcement technology, and the key force parts are thickened to eliminate the tilt, deformation, and loosening of the outriggers caused by long-term heavy loads and windy weather.At the same time, the outriggers, the main beam and the walking base are fixed by high-strength bolts and welding, which are tightly connected without gaps, and the integrity of the whole machine is extremely strong.For long-span models, the spacing of the outriggers has been accurately calculated by mechanics, which greatly improves the anti-overturning ability of the whole machine. Even under unilateral heavy loads and strong horizontal winds, the fuselage can still be kept stable, and the safety of outdoor steel yard operations is guaranteed in all directions.
Lifting mechanism
The lifting mechanism is the core execution unit of equipment operations, which directly affects the stability, accuracy and operating efficiency of hoisting.The 20t double-girder gantry crane is equipped with an industrial-grade special hoist/winch system, which is suitable for the needs of 20-ton heavy-duty and high-frequency hoisting. The lifting speed is stable, the braking is accurate, and there is no slip hook or caton problem.
The crane adopts a frequency conversion speed control system, which can freely switch between fast and slow speeds, and the heavy-duty lifting buffer is stable, effectively avoiding the shaking of the fuselage and material swing caused by instant start and stop, and greatly improving the stability of long-span operations.At the same time, it is equipped with multiple safety protection devices, including overload limit, lifting height limit, travel limit, and emergency braking device. In the event of hidden dangers such as overload, over-travel, and abnormal shaking, the equipment can be stopped immediately for protection.All core accessories of the lifting mechanism are made of wear-resistant, high-strength industrial accessories, which are suitable for harsh outdoor working conditions, with low failure rate and strong durability to ensure long-term continuous and stable operation.
How to Ensure Stability in High-Span Gantry Cranes
Span and load distribution
Large span is an essential attribute of outdoor large-scale steel yard cranes, but the larger the span, the more complex the force of the equipment, and the more prone it is to uneven force, local deformation, and fuselage shaking. Therefore, span planning and load distribution are the core foundations of stable operation.The 20t double-girder gantry crane supports customization of large spans of 5-40 meters. All span parameters have been calculated by professional mechanical simulation to match the corresponding main beam specifications, outrigger spacing and structural reinforcement scheme to eliminate the safety risks caused by blind large-span design.
The crane adopts a symmetrical load distribution design, and the double main beams evenly distribute the lifting weight to avoid structural tilt and deformation caused by excessive force on one side.At the same time, the force balance is adjusted in real time through the intelligent control system during the operation, and the load distribution is automatically optimized for different working conditions such as midpoint hoisting and offset hoisting to ensure consistent hoisting stability throughout the span.In addition, the equipment strictly follows the rated load operation standards, eliminates long-term overload and partial load operations, and cooperates with reasonable span adaptation schemes to ensure the structural stability of large-span working conditions from the two dimensions of design and use.
Wind resistance
The outdoor steel yard is unobstructed. Windy weather is the main factor affecting the stability of gantry cranes and causing safety accidents. Wind resistance design is the core technical focus of long-span models.The 20t double-girder gantry crane has been optimized for all-round wind resistance in outdoor wind conditions. The structure of the whole machine adopts a streamlined mechanical design, which effectively reduces wind resistance and reduces the impact of horizontal wind on the fuselage.
The equipment is equipped with professional windproof devices, including track clamps, windproof anchoring devices, and wind monitoring alarms, which can monitor outdoor wind speed in real time. When the wind speed exceeds the safe operating threshold, it will automatically warn and lock the walking mechanism to prevent the crane from sliding and shaking with the wind.The long-span main beam and outrigger structure have been reinforced and optimized for wind resistance, and the overall wind resistance level meets the standards of outdoor open-air operations, which can withstand conventional windy weather.At the same time, for strong wind areas such as coastal and wilderness areas, enhanced windproof configurations can be customized, windproof brackets and locking systems can be upgraded, and equipment stability and operational safety under harsh wind conditions can be improved in all directions.
Rail and foundation design
The track and foundation are the basic carriers for the stable operation of the Henan Mine Crane manufactured crane. Insufficient foundation bearing capacity, uneven track laying, and weak fixation will directly cause the operation of the long-span crane to shake, tilt the fuselage, and fatigue damage to the structure, seriously affecting the safety of operations and equipment life.The 20t long-span double-girder gantry crane has standardized and specialized supporting requirements for foundation and track design.
The foundation needs to be reinforced and poured with concrete according to the span, weight, and rated load of the equipment to ensure uniform load-bearing, no settlement, and no cracking of the foundation, and to eliminate the hidden dangers of the tilt of the fuselage from the bottom.The track adopts national standard heavy-duty steel rails, which are adapted to the needs of 20 tons of heavy-duty walking. The track is accurately leveled and the spacing is calibrated throughout the laying process, and the fixing bolts are encrypted and reinforced to ensure that the track is straight and stable, with no offset and no loosening.At the same time, it is equipped with track limits and cushioning devices to avoid the vibration and structural damage of the fuselage caused by over-range and collision of the equipment.The standardized foundation and track design can maximize the structural performance of the equipment and ensure the stability and stability of long-span and long-distance walking operations.
20t Double Girder Gantry Crane Price and Customization
Main cost factors
There is no fixed standard for the market price of 20t double-girder gantry cranes. It is mainly affected by the four core factors of core configuration, structural parameters, material technology, and functional upgrade. The price gap between different configurations of equipment is significant.The first is the span and lifting height. The larger the span and the higher the lifting height, the more materials are used for the main beam and outriggers, the higher the process requirements, and the simultaneous increase in equipment costs are the core factors affecting pricing.
The second is the steel material and production process. The cost difference between ordinary carbon steel and Q345B high-strength anticorrosive steel is large. High-end processes such as automatic welding, precision machining, and anticorrosive spraying will slightly increase the cost, but the stability and service life of the crane can be greatly improved.In addition, the electrical and safety configuration, ordinary contactor control and frequency conversion intelligent control, basic safety protection and a full set of intelligent early warning system, the price gap is obvious.Finally, there is the operating level. The conventional working conditions of A5 are different from the heavy-duty continuous operating level of A6-A7. The configuration standards of the core accessories are different, which directly affects the overall cost of the crane.
Custom design options
In order to adapt to the site size, operating conditions, and production needs of different steel yards, the 20t double-girder gantry crane supports full-dimensional personalized customization, which can accurately match various outdoor operation scenarios.In terms of structure, different spans, lifting heights, and cantilever lengths can be customized to adapt to large and small yard sites; in terms of working conditions, the heavy-duty operation configuration can be upgraded to meet the needs of high-frequency and continuous heavy-duty operations and adapt to high-intensity production scenarios.
In terms of functions, it supports upgraded configurations such as frequency conversion speed regulation, remote wireless control, intelligent weighing, wind speed monitoring, fault self-diagnosis, and unattended intelligent operation to improve operational efficiency and intelligence.In terms of environmental adaptation, special models for enhanced anti-corrosion, high temperature resistance, low temperature resistance, and strong wind resistance can be customized to adapt to special outdoor scenes such as coastal, wilderness, alpine, and high temperature.At the same time, special spreaders and anti-skid devices can be customized according to the material type, and the steel hoisting operation experience can be optimized in a targeted manner.
Installation and delivery costs
The complete crane procurement cost not only includes the price of the equipment body, but also covers supporting costs such as transportation, installation, commissioning, and after-sales.Transportation costs are mainly calculated based on the size, weight and transportation distance of the equipment. Large-span models are large-scale equipment, and the transportation cost is slightly higher than that of conventional equipment. Manufacturers can provide nationwide logistics and distribution services to ensure the safe and lossless delivery of equipment.
The installation and commissioning costs include on-site foundation docking, track calibration, equipment assembly, system commissioning, safety testing and other full-process services. Professional manufacturers are equipped with licensed installation teams and operate in strict accordance with national standard construction standards to ensure equipment installation accuracy, stable operation, and compliance with standards.At the same time, regular manufacturers will provide free technical guidance, acceptance and docking, operator training services, and follow-up long-term warranty, maintenance, and parts replacement after-sales support, greatly reducing users' later operation and maintenance costs, and realizing one-stop procurement and worry-free use.
Henan Mine Crane Factory Custom
With its powerful heavy-duty capacity, extreme outdoor environmental adaptability, and stable long-span structural performance, the 20t double-girder gantry crane has become an indispensable core lifting equipment for outdoor steel yards.The exclusive double-beam structure, scientific span load design, all-round wind-resistant stability scheme, and standardized foundation track adaptation have solved the problems of operational stability under long-span, heavy-duty, and harsh outdoor working conditions in the steel yard in an all-round way.At the same time, Henan Mine Crane Factory's flexible customized solutions, transparent price system, and perfect supporting services can meet the equipment upgrade and procurement needs of enterprises of different sizes.For steel yard companies, choosing Henan Mine Crane Manufactured 20t double-girder gantry crane with stable structure, suitable configuration and reliable technology can not only improve material hoisting efficiency and ensure operation safety, but also reduce long-term operation and maintenance costs, and build a solid foundation for the stable operation of the production line.
