What is an MG heavy-duty gantry crane?
MG double-girder gantry crane, commonly known as heavy-duty gantry crane, consists of two box girders, A-type or U-type rigid legs, heavy-load lifting trolley, crane travelling mechanism and complete electrical control system. It travels along ground steel rails and is developed for outdoor continuous heavy-load operations featuring large tonnage, long working hours and high frequency.
Usage Scenarios
Long-term outdoor lifting of heavy workpieces has become a regular production requirement in heavy steel structure manufacturing, ship repair and construction, wind power tower cylinder processing, prefabricated bridge component production, large steel material warehousing, and hydropower infrastructure construction sites. As the main heavy-duty lifting equipment for large-tonnage outdoor operations, equipment adopting the MG double-girder gantry structure, heavy-duty design with high working class and professional multi-layer wind protection system for outdoor use serves as a reliable solution for heavy material handling in heavy industrial plants and engineering yards.
Selection Guide for Core Parameters of MG Type Gantry Crane
| NO. | Core Parameter Dimensions | Selection Specifications and Standard Requirements |
|---|---|---|
| 1 | Rated Lifting Capacity | 5 — 500T |
| 2 | Span | 18 — 40m |
| 3 | Lifting Height | 6 — 18m |
| 4 | Working Class | A5 / A6/A7/A8 |
| 5 | Power Supply Voltage | 380v / 50Hz / 3P (Custom voltage available) |
| 6 | Control Mode | remote control /air operation |
| 7 | Safety System | overload limiter, travel limit switch, buffer, wind speed alarm interlock, electric windproof rail clamp, manual windproof device |
Standard Hardware Configuration of MG Heavy Gantry Crane
- Main Load-Bearing Structure: The double-box main girder is fabricated with automatic submerged arc welding, and non-destructive testing is performed on all critical welds. Strength, stiffness and stability verification of the complete machine are completed via finite element simulation to meet national design standards for heavy-load fatigue working conditions. Q355B high-strength steel is prioritized as the material for the main girder.
- Trolley Assembly: Heavy-duty dedicated winch trolley equipped with heavy-duty safety brakes and large-diameter drums. The safety factor of steel wire ropes complies with specifications for heavy equipment and enables stable lifting under eccentric loads.
- Travel Driving Mechanism: Adopts a balanced multi-drive layout to effectively prevent crab traveling deviation. Heavy-duty forged wheels feature excellent wear resistance and compression resistance, suitable for all-weather long-term reciprocating travel.
- Multi-layer Wind Protection Safety System: Dual protection consisting of electric rail clamps and manual wind-proof devices, together with an anemometer interlock system. Simple wind-proof wedges shall not be used as the sole wind protection solution to resist sudden gusts.
- Electrical Control System: Dedicated heavy-duty frequency conversion control cabinet with multiple protections against overload, overcurrent, phase sequence faults and voltage loss. Outdoor electrical enclosures are sealed for dustproof and waterproof performance.
- Complete Set of Qualification Documents: Complete documentation including Special Equipment Manufacturing License, complete machine type test report and load calculation sheet, supporting safety supervision acceptance and project bidding review.
Special Working Condition Solutions for Segmented Industries
Steel Structure Processing Factory
Adopt MG heavy-duty door machines with A5/A6 working class and double-sided cantilever layout to facilitate workshop material delivery and truck loading and unloading. Variable-frequency electric control reduces impact during the hoisting of steel components and prevents profile collision and deformation.
Wind power components, precast bridge yard
Models with large span and high lifting height equipped with an intelligent anti-sway system enable stable hoisting of large tower barrels and precast box girders. Coastal and riverside factory installations adopt upgraded marine-grade heavy anti-corrosion coatings to withstand continuous erosion caused by humid salt spray.
Shipbuilding and Repair Base
Prioritize MG heavy gantry cranes with high working class A7/A8 to support non-stop round-the-clock operation. Equipped with a complete set of reinforced wind protection systems, they are suitable for windy environments along rivers and coasts.
Large Steel Warehousing Base
Long-span models cover multiple cargo positions and can be equipped with special lifting beams and dedicated lifting tools for steel coils to realize efficient stacking and transportation of heavy profiles and steel coils.
Standardized Installation and Acceptance Specifications
After the on-site assembly of the equipment is completed, the full set of acceptance procedures shall be strictly implemented: no-load trial operation, half-load trial hoisting, full-load trial hoisting and static load overload test. The effectiveness of windproof rail clamps, limit protection devices, braking systems and wind speed interlock functions shall be tested item by item.
Complete list of technical documents for handover: general assembly drawing of the complete machine, load calculation report, type test certificate, operation and maintenance manual, and list of wearing parts to ensure successful passing of special equipment inspection.
After-sales Support System
Henan Mine Crane MG Heavy Double Girder Gantry Crane comes with a 1-year overall machine warranty, and extended warranty is available for core components including the lifting trolley, drive assembly and electric control system. Responses via WhatsApp will be provided within 24 hours, with continuous remote technical support and stable supply of original spare parts. Annual regular inspection service is available to identify potential faults of girder welds, travelling mechanisms and windproof systems in advance, effectively extending the service life of the complete machine.
If you have planning demands for large-tonnage lifting equipment, please provide site dimensions, load types and operating requirements. Contact Chloe of Henan Mine, and you can obtain a full set of free technical solutions and official quotation sheets for MG heavy-duty double-girder gantry cranes.
Contact: Chloe
Tel: +86 18238799707 (Same number for WhatsApp)
Email:sales07@minehenancranes.com
FAQS
Q: What material is used for the main girder of the MG heavy gantry crane manufactured by Henan Mine, and what are the differences from products of ordinary manufacturers on the market?
A: The main girders and legs of Henan Mine MG series uniformly adopt Q355B high-strength steel plates. The complete machine is verified via finite element mechanical simulation, and 100% non-destructive testing is carried out on key welds. Low-cost products available on the market usually adopt Q235 steel plates with reduced thickness, which may cause downward deflection of the main girder under long-term heavy loads. Henan Mine Crane manufactures products in strict accordance with national standards for heavy-load operation. Models with high working class A5~A8 feature sufficient structural safety margin, suitable for continuous long-term heavy-load outdoor operations.
Q: Does Henan Mine MG gantry crane support main and auxiliary hook configuration? What is the maximum lifting capacity available?
A: Customizable main and auxiliary hook structure is supported to meet both heavy lifting of large components and precise hoisting of small parts. Standard models cover a lifting capacity range from 5 tons to 500 tons, and special non-standard design is available for capacities beyond this range. All large-tonnage MG models can be equipped with variable frequency electric control and energy feedback systems.
Q: Can Henan Mine MG gantry cranes used for coastal wind power and shipbuilding projects be equipped with marine-grade anti-corrosion treatment?
A: Yes. Henan Mine provides three tiers of anti-corrosion solutions: standard anti-corrosion, heavy-duty anti-corrosion and marine-grade heavy-duty anti-corrosion. The marine-grade solution is recommended for coastal salt fog areas, which adds high-build epoxy zinc-rich coating and polyurethane topcoat. Stainless steel is adopted for key fasteners, and the protection rating of the electrical system is upgraded to IP55. It can effectively resist erosion from sea wind and salt fog and extend the service life of the whole crane.
