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1. High-Efficiency Planetary Gear Drive System
The hoisting and crane travelling mechanisms are equipped as standard with high-precision planetary reducers, delivering a transmission efficiency exceeding 95% and markedly lowering power consumption. Its multi-stage gear meshing design keeps operating noise under 75dB for a quiet workplace environment. Thanks to the fully sealed lubrication construction, the unit boasts a long service life with low maintenance requirements, which drastically cuts the overall life-cycle operation and maintenance costs.
2. Optimized High-Rigidity Structural Design
The main girder adopts a box double-girder structure optimized through Finite Element Analysis (FEA). Key welding joints are manufactured by automatic submerged arc welding to guarantee structural rigidity and fatigue endurance.
3. Intelligent Electrical Control System
Adopting Variable Frequency Drive (VFD) speed control technology, the crane achieves steady running and accurate positioning, and effectively suppresses load sway.
4. Comprehensive Multi-Safety Protection Devices
Fitted with a load moment limiter, travel limit switches, wind-proof & anti-slip devices as well as an emergency stop system, the crane fully conforms to national and international crane safety specifications.
5. Long-Lasting Premium Structural Materials
All primary load-bearing parts are fabricated from high-grade carbon structural steel (Q355B / Q235B). Steel surfaces are treated by shot blasting for rust removal, followed by coating with high-performance anti-corrosion paint for lasting protection.
Technical Parameters
Model Number | MG | |||||||||||
Lifting Capacity | t | 5 | 10 | 20/5 | 32 | 50/10 | 160/50 | 200/50 | 320/80 | |||
Maximum Lifting Height | Main Hoist | m | 12 | 12 | 12 | 12 | 12 | 15 | 15 | 15 | ||
Auxiliary Hoist | m | / | / | 12.5 | 12.79 | 12.95 | 15.72 | 15.75 | 16.5 | |||
Span | m | 18-35 | 18-35 | 18-35 | 18-35 | 18-35 | 18-35 | 18-35 | 18-35 | |||
Speed | Lifting | Lord | A5 | m/min | 12.5 | 8.5 | 7.1 | 6 | 5 | 3.5 | 3.5 | 3.6 |
Assistant | A5 | / | / | 9.2 | 9.2 | 8.5 | 5.9 | 5.9 | 6 | |||
Trolley Travel | A5 | m/min | 37.2 | 37.2 | 36.6 | 29.8 | 31 | 22.5 | 29 | 16.7 | ||
Gantry Travel | A5 | m/min | 41 | 41 | 37.7 | 38 | 38 | 2.8-28 | 2.8-28 | 2.8-28 | ||
Main Dimension | H | A5 | 15005 | 15970 | 15983 | 16341 | 16878 | 21190 | 22285 | 23003 | ||
Power Supply | 3-Phase A.C.380V 50Hz | |||||||||||
Product Application
1. Railway Freight Terminals & Logistics Yards
Ideal for loading and unloading steel products, timber, bulk goods and general sundry cargo. Thanks to its wide span design, it can cover multiple railway tracks and various yard zones simultaneously.
2. Manufacturing Workshops
Deployed for horizontal transfer and accurate positioning of heavy mechanical components, molds and production raw materials.
3. Hydropower Plants & Construction Sites
Perfect for the installation and routine maintenance of large-scale equipment and structural components.
4. Shipyards & Offshore Engineering Projects
Applied for hull block assembly, heavy marine engine hoisting and steel plate preprocessing. Optional high lifting height and extended outreach configurations enable hoisting operations deep inside cargo holds, fully accommodating the complicated working procedures of shipbuilding.
Product Video
FAQ
Q1: What technical factors lead to rail gnawing when a gantry crane is running?
Answer:
Rail gnawing generally stems from the following root causes:
1. Wheel installation deviations (horizontal inclination and vertical deflection);
2. Installation inaccuracies of the crane rails: track gauge deviation, elevation height difference, and straightness exceeding the allowable tolerance range;
3. Unsynchronized operation of the bilateral driving motors, or inconsistent braking clearance adjustment on both sides.
It is advised to periodically inspect and measure the geometric parameters of wheels and rails, and calibrate the driving system to ensure synchronous movement.
Q2: The variable frequency drive (VFD) frequently triggers fault alarms and cuts out during crane or trolley travelling operation. How to carry out troubleshooting?
Answer:
Recurring VFD faults are mostly attributable to issues within the electrical system. Troubleshooting steps are as follows:
1. Verify that the input power phase sequence is correct, and check for excessive mains voltage fluctuations.
2. Confirm the braking resistor is properly sized for the system and has adequate heat dissipation. Frequent braking operations will easily trigger DC bus overvoltage protection.
3. Inspect whether the encoder feedback signal is disturbed by electromagnetic interference generated from high-frequency harmonics of the VFD. It is advised to use shielded cables, together with reliable earthing for both the motor and entire control system.
Q3: What potential safety hazards will be brought about by hook slipping under heavy load conditions?
Answer:
Hook slipping under load is primarily induced by the following reasons, accompanied by major safety risks:
1. Insufficient braking torque or excessive abrasion of brake linings;
2. When bearing heavy loads, fatigue failure of brake springs or delayed response of hydraulic thrusters will prevent the drum from being locked immediately upon power cutoff, resulting in uncontrolled load lowering;
3. Preventive maintenance requirements: The brake clearance shall be measured periodically, and brake lining wear must be inspected thoroughly. Brake pads must be replaced once wear loss exceeds 50% of the original thickness. Meanwhile, confirm that the rated braking torque complies with the 1.25 times static load test standard.
Q4: Action delays or command dropout occur when operating the crane via wireless remote control. What measures can be adopted to guarantee stable signal transmission?
Answer:
Signal attenuation is mainly triggered by on-site electromagnetic interference (generated by large motors, welding equipment and other devices) or signal blockage by metal barriers. The recommended solutions are as follows:
1. Adopt industrial encrypted remote controllers equipped with frequency hopping technology to evade frequency bands susceptible to workshop interference;
2. Mount the receiving antenna at the highest position of the crane, keeping it far away from strong electromagnetic interference sources such as variable frequency drives (VFDs);
3. Routinely check the supply voltage of the remote control batteries; insufficient battery power will lower the signal transmitting power;
4. Periodically calibrate and test the receiving sensitivity of the signal receiver. Install a signal booster amplifier when weak reception persists.
Q5: What technical anti-corrosion specifications are required for the metal structures of gantry cranes that operate outdoors long-term or in coastal high-salinity environments?
Answer:
Outdoor exposure and coastal salt-laden atmospheres will severely accelerate steel corrosion and degrade structural fatigue performance. Dongqi Machinery implements the following professional anti-corrosion technical measures during production:
1. All steel structural surfaces are treated with Sa2.5 grade shot blasting cleaning to completely remove rust and contaminants, which effectively enhances the bonding force between steel substrate and paint coatings;
2. A heavy-duty multi-layer anti-corrosion coating system is applied: Epoxy Zinc-rich Primer + Epoxy Micaceous Iron Oxide Intermediate Coat + Polyurethane Finish Topcoat;
3. Key load-bearing welded joints shall be inspected periodically via Non-Destructive Testing (Ultrasonic Testing / Magnetic Particle Testing, UT/MT). This stops microcracks from expanding due to stress concentration, so structural integrity can be guaranteed throughout the entire service life of the crane.
