L-Type Single Girder Gantry Crane with Offset Trolley
Product Introduction
L-Type Offset Single-Girder Gantry Crane (also known as L-Type Single-Girder Offset Gantry Crane) features a box girder main beam and L-type leg structure, with the electric hoist offset on one side of the main girder. Lifting capacity ranges from 1 to 20 tons, span from 12 to 35 meters, and working environment temperature from -20°C to +40°C. The single-leg offset design is particularly suited for overhead rail hoisting of long structural components (such as steel sections, pipe piles, and bridge components), providing ample clearance beneath the main girder for long materials to pass through.
Matched with CD1/MD1 electric hoists, the lifting speed is 8 m/min, with dual-speed option available (8/0.8 m/min). The product is designed and manufactured in accordance with the JB/T 5663-2008 standard.
Product Specifications
- Product Name: L-Type Offset Single-Girder Gantry Crane (L-Type Single-Girder Gantry Crane)
- Model & Specification: L-Type, Lifting Capacity 1–20 tons
- Place of Origin: Xinxiang, Henan (Kelude Heavy Industry)
- Custom Manufacturing: Non-standard fabrication available, production lead time 10–15 days
- Main Girder Structure: Box girder, offset mounting configuration
- Applicable Span: 12–35 meters
- Power Supply: Three-phase AC 380V 50Hz
Product Photos
The above images show actual photographs of the L-Type Offset Single-Girder Gantry Crane. The offset design provides greater clearance beneath the main girder, facilitating the passage of long structural components.
Product Features
- Offset Design: The electric hoist is offset to one side of the main girder, leaving the area beneath the main girder unobstructed for smoother long-material rail transfer.
- L-Type Leg: Single-leg L-shaped structure minimizes footprint and facilitates rail transfer operations at track ends.
- Box Girder Main Beam: Provides excellent stiffness and stable load-bearing performance, suitable for medium-to-heavy lifting applications.
- Multiple Control Options: Floor handle / operator cab / remote control available.
- Short Lead Time: Standardized design enables delivery within 10–15 days.
- Flexible Customization: Span, lifting height, and cantilever length can be custom-manufactured to meet specific requirements.
Working Principle
The box girder main beam is fabricated by welding the top and bottom flange plates and web plates into a closed section, supported by the L-type outriggers. The crane travel mechanism moves longitudinally along the ground crane rail, while the electric hoist traverses laterally on one side of the main girder via the I-beam rail. The CD1 conical rotor motor drives the hoisting mechanism, which through three-stage deceleration rotates the drum wire rope to raise and lower the hook. The offset configuration positions the hoist travel path away from the main girder centerline, providing clearance for long materials during rail transfer.
Product Structure
Technical Parameters
L-Type Offset Single-Girder Gantry Crane Comprehensive Technical Parameters (1–20 tons)
| Parameter | Unit | 1t | 2t | 3t | 5t | 10t | 16t | 20t |
| Rated Lifting Capacity | t | 1 | 2 | 3 | 5 | 10 | 16 | 20 |
| Applicable SpanS | m | 12~20 | 12~24 | 12~26 | 12~30 | 12~35 | 12~35 | 12~35 |
| Lifting HeightH | m | 6/9 | 6/9 | 6/9 | 6/9/12 | 6/9/12 | 6/9/12 | 6/9/12 |
| Hoist Model | CD1-1 | CD1-2 | CD1-3 | CD1-5 | CD1-10 | MD1-16 | MD1-20 | |
| Lifting Speed | m/min | 8 | 8 | 8 | 8/0.8 | 8/0.8 | 7/0.7 | 6/0.6 |
| Hoist Travel Speed | m/min | 20 | 20 | 20 | 20 | 20 | 20 | 20 |
| Long Travel Speed | m/min | 20 | 20 | 20 | 20~30 | 20~30 | 20~30 | 20~30 |
| Hoisting Motor Power | kW | 1.5 | 3.0 | 4.5 | 7.5 | 13 | 16 | 18.5 |
| Travel Motor Power | kW | 0.4 | 0.4 | 0.4 | 0.8 | 0.8×2 | 1.5×2 | 1.5×2 |
| Work Duty / Classification | A3 | A3 | A3 | A3~A4 | A3~A4 | A4 | A4 | |
| Control Method | Floor Handle / Cabin / Operator Cab / Remote Control | |||||||
| Power Supply | 3AC 380V 50Hz | |||||||
L-Type Offset Single-Girder Gantry Crane Weight and Crane Rail Parameters
| Parameter | Unit | 1t | 2t | 3t | 5t | 10t | 16t | 20t |
| Dead Weight(Floor Operation) | t | ~5.5 | ~7.5 | ~9.5 | ~12.5 | ~16.5 | ~22 | ~28 |
| Recommended Rail | P18 | P24 | P24 | P24~38 | P38~43 | P43 | P43~50 | |
| Maximum Wheel Load(Approx.) | kN | ~30 | ~40 | ~50 | ~60 | ~80 | ~110 | ~130 |
| Cantilever Length Degree | ≤S/3(Customizable on Request) | |||||||
The parameters above are reference values for standard configurations. Actual weight and wheel load are determined by factors such as span and lifting height, and are subject to the final Technical Solution.
Typical Applications
- Steel markets: Loading, unloading, and stacking of steel pipes, profiles, and plates.
- Concrete pile plants: Long-distance rail-transfer hoisting of prestressed concrete piles.
- Bridge girder precast yards: Transfer and erection of girder components.
- Equipment manufacturing plants: Cross-workshop handling of large structural parts.
Selection Guide
Light-duty: 1~3t, span 12~20m, reference price ¥40,000–80,000.
Medium-duty: 5~10t, span 20~30m, reference price ¥100,000–200,000.
Heavy-duty: 10~20t, span 24~35m, reference price ¥200,000–400,000.
Operating Instructions
Inspection: Ensure the crane rail is clear of obstructions, the wire rope is in good condition, and the brake is responsive and reliable.
Operation: Perform a No-Load Test Run to confirm all mechanisms function properly. Conduct a Trial Lift of 200mm to verify braking reliability. Overloading and angled or skewed lifting are strictly prohibited. Operations must cease when wind speeds exceed Force 6.
Maintenance: Periodically inspect rail joints, wire rope wear, and brake clearance. Apply grease to all lubrication points as specified.
Why Choose Kelude Heavy Industry
Off-center structure expertise: Over 100 units of L-type off-center gantry cranes delivered to date, with main girder stiffness and off-center load stability proven over years of service.
Box girder welding process: 100% UT flaw detection on main girder butt welds, in compliance with JB/T 5663.
Fast delivery: Standardized drawings combined with a flexible production line enable delivery in 10–15 days.
Service & Support
Call 13903802779 for 24-hour response.
Need a selection proposal or quotation for an L-type off-center single-girder gantry crane?
Contact the Kelude Heavy Industry sales & engineering team anytime.
FAQ
Q: What is the difference between an L-type off-center gantry crane and a standard MH Type gantry crane?
A: The L-type off-center gantry crane features a single L-shaped leg with an offset hoist, providing greater clearance below the main girder — ideal for rail-transfer hoisting of long structural members. A standard MH Type crane, by contrast, uses two outriggers with a centered hoist, making it better suited for routine handling of uniform loads. The off-center design offers a clear advantage when moving long materials across rails.
Q: Which national standards does the L-type off-center gantry crane comply with?
A: It is designed and manufactured to JB/T 5663-2008 Electric Hoist Gantry Crane. The main girder design follows GB/T 3811 Crane Design Standard, and safety protection complies with GB 6067 Safety Rules for Lifting Appliances.
Q: What are Kelude Heavy Industry's advantages in manufacturing L-type off-center gantry cranes?
A: Kelude Heavy Industry is based in Xinxiang, Henan — the heart of China's crane industry — and has long supplied off-center gantry cranes to steel markets, concrete pile plants, and bridge girder precast yards. All main box girder welds undergo 100% UT flaw detection. We offer non-standard customization of cantilever length and lifting height, and provide full-process service from site survey through installation.
