Double Girder Gantry Crane:

• Lifting Capacity: 5-500ton
• Span: 18-35m
• Lifting Height: 1-40m
• Working Class: A5
• Temperature: -25℃～+40℃
• Power Supply: 3-ph, 380V,50HZ

We can also design and manufacture non-standard products according to your needs.

Features of Double Girder Gantry Crane:

1. Strong lifting capacity, large span, good stability, varieties
2. Novel structure, attractive appearance, good usability
3. Standardization, universalization and serialization of parts
4. Flexible operation, safe and stable

Gantry Mounting of Double Girder Gantry Crane:

1. "A" type structure, using tack bolts and connecting bolts to settle main parts;
2. Provided max. room between legs to ensure the objects could be lifted between legs at the cantilever end;
3. All partial rail box beam structure main girder, the camber meet national standard (0.9~1.4)/1000S, flange and bolts connect main girders and legs;
4. Box structure legs, both sides connect separately with main girders and lower separators.
5. Q235B or Q345B materials (similar as Fe37 or Fe52).

Crane Traveling Mechanism of Double Girder Gantry Crane:

1. Separately drive
2. Vertical trinity drive, compact and safe;
3. Interference fit key link the wheels and axles, angle bearing box for wheel group;
4. Two sets outage terminal limiter and backstop device with buffer, for accurate positioning of crane;
5. Equipped rail clamp and anchorage for wind and storm proof.

Distribution & Security Protection of Double Girder Gantry Crane:

Distribution system is composed of master breaker, master power contactor and main circuits of mechanisms, so that the subcircuit out of work could be maintained isolated. There are starting & emergency switches, power indicator, safe and limit switches for master power, and short circuit, over current, overload & voltage protections in distribution control circuit, which switch off when power interrupts. Zero protection for mechanisms. If the handles are not back in zero position when fault recovery, they cannot auto start.

1、overload & short circuit protection

Master air switch in master circuit, small air switch or fuse protection as overload and short circuit protection in control circuit. Over current & overload protect functions are set in all control cabinets.

2、zero position protection

Every controller should be back to zero position, then restart master contactor when the gantry crane start or restart to work.

3、limit protection

• limit switch in lifting mechanism break the control circuit when hook get the limitation for ensure security.
• limit switches in both trolley and gantry crane travel mechanisms break control circuit when traveling to the limit position. It can only travel to the other side.
• limit switches are also set in the door of cabin and balustrades. The master power can be started when these doors are totally closed.
• emergency protection, Emergency switch could quickly break the power in emergency.
• overload protection, Overload limiter is set in lifting mechanism, it could break power, alarm with sound and light and show the number when overloaded.

Control Mode of Double Girder Gantry Crane:

1. Cabin control, fully enclosed, steel plate bending production with enough strength and stiffness, broad vision;
2. Linkage control design could ensure driver to operate safely and comfortably. Safe and convenient passageway, comfortable seat. The cabin is equipped with fire extinguisher, display screen of overload limiter.

Drawing of Double Girder Gantry Crane:

Double Girder Gantry Crane Price:

Double Girder Gantry Crane（t）	Price(USD)
5 ton	$5,800 - $72,000
10 ton	$6,500 - $79,000
15 ton	$7,800 - $86,000
20 ton	$8,500 - $95,000
25 ton	$9,800 - $110,000
30 ton	$10,000 - $120,000
50 ton	$15,000 - $130,000

The Specification of Double Girder Gantry Crane are for Reference:

MG Double Girder Gantry Crane with Hook                           5t
Span(S)	m	18	22	26	30	35
Lifting Height	m	10	10	12	12	12
Lifting Speed	m/min	12.5
Trolley Speed	m/min	37.2
Crane Speed	m/min	37.7			40.1
Total Power Supply	KW	31.8	31.8	31.8	40.8	40.8
Max. Wheel Load	KN	217	230	243	266	289
Recommend rail		P43
Main Dimension	mm	18	22	26	30	35
Total Height	H4	13374	14474	13524	15606	15698
Crane Wheel Tread	W	7000	7000	8500	8500	8500
Total Width	B	8554	8554	13050	13050	13050
Left Cantilever	L1	6500	6500	6500	9000	9000
Right Cantilever	L2	6500	6500	6500	9000	9000
Hook Left Limitation	S1	5000	5000	5000	7500	7500
Hook Right Limitation	S2	5000	5000	5000	7500	7500
Trolley track gauge	K	1400

 

MG Double Girder Gantry Crane with Hook                          10t
Span(S)	m	18	22	26	30	35
Lifting Height	m	10	10	10	12	12
Lifting Speed	m/min	8.5
Trolley Speed	m/min	43.8
Crane Speed	m/min	37.7		40.1
Total Power Supply	KW	36.5	36.5	45.5	45.5	45.5
Max. Wheel Load	KN	225	228	245	290	310
Recommend rail		P43
Main Dimension	mm	18	22	26	30	35
Total Height	H4	14580	14580	14580	16590	16590
Crane Wheel Tread	W	8000	8000	8500	9500	9500
Total Width	B	9554	9554	10350	11350	11350
Left Cantilever	L1	6500	6500	7500	9000	9000
Right Cantilever	L2	6500	6500	7500	9000	9000
Hook Left Limitation	S1	5000	5000	6000	7500	7500
Hook Right Limitation	S2	5000	5000	6000	7500	7500
Trolley track gauge	K	2000

Manufacturing Process of Double Girder Gantry Crane:

1. Surface Treatment: All panels and profiles are after spot blasting to Sa2.5 level in GB8923-88, then after erosion by machine or hand to make the steel surface get St3 level, paint priming with thickness among 15~20μm. 3 layers finishes with thickness ≥120um. Paint film adhesion accord with level one quality requirement of GB9286.
2. Montage: The steel plate after processed should be montaged according length; butt welds of cover plate and sternum of main girder should be detected by ultrasonic or X light to meet the requirements of 1 level in JB1152 or 11 level in GB3323.
3. Gas Cutting: Cover plate and sternum of main girder use CNC automatic cutting, common members use Semi-automatic cutting, small size parts use copy cutting.
4. Welding: Butt welds of cover plate and sternum of main girder use union melt welding, four main angles welding line use C0₂ gas protect automatic welding wire welding, common welding line use Manual C0₂ gas protect welding.
5. Main workpieces: Wheel use power frequency quenching, tread hardness reach HB300~380, at 20mm in depth of hardening layer, the hardness should not be less than 260HB. Brake wheel use Intermediate hardening, at 2-3mm in depth of hardening layer, the hardness should not be less than 245-55HRC. Gear ring of coupling use gear shaping or hobbing processing, then high frequency hardening, its hardness reach 33-38HRC.
6. Assembly: Wheel axles are assembled with wheels by oil press; axles and bearings are assembled after heated by AUELY. All mechanisms must be operated unloaded after assembled.

Quality Control in Producing of Double Girder Gantry Crane:

1. Mental construction of double girder gantry crane use steel pretreatment process, butt welds of cover plate and sternum of main girder should be detected by ultrasonic or X light.
2. The wheels of double girder gantry crane and trolley and brake wheel use middle, high frequency heat treatment controlled by Leeb Hardness Tester.
3. Lateral deviation of the wheels controlled by later deviation tester.
4. Machine motion noise is measured by precision sound level meter.
5. Insulation is tested by megger, current is tested by clamp ammeter.
6. Various parts are tested by measure gauges, plug guages, and general measures.
7. The camber degree and Static Rigidity are tested by theodolite and balance level.
8. Special coating thickness gauges test and control the depth of paint films.

Application of Double Girder Gantry Crane:

1. Ports and terminals: Double girder gantry cranes are mainly used for container loading, unloading and handling in ports and terminals. Its large span and high load carrying capacity enable it to handle large cargoes efficiently.
2. Manufacturing industry: Double girder gantry cranes are commonly used for lifting and moving heavy machinery, steel and large equipment.  
3. Warehouses and logistic centers: Double girder gantry cranes are used for stacking, sorting and transportation of goods. 
4. Construction Sites: Double Girder Gantry Cranes are used for lifting construction materials such as prefabricated components, steel and concrete blocks.  
5. Energy industry: Double girder gantry cranes are used to install and maintain heavy equipment such as turbines, generators and boilers in the energy industry, especially in nuclear, hydro and thermal power plants. 
6. Railway and bridge construction: Double girder gantry cranes are used for lifting and installing bridge components, railroad tracks and heavy equipment.  
7. Aerospace: Double girder gantry cranes are used for lifting and installing aircraft components, rockets and satellites. Its high precision and stability ensure the safe transportation and installation of critical components.
8. Shipbuilding: Double girder gantry cranes are used for lifting and installing ship components, engines and heavy equipment. 
9. Automation and Intelligent: With the development of technology, double girder gantry cranes are gradually automated and intelligentized, equipped with remote control, automatic positioning and intelligent monitoring system.