LDP Type Offset Single Girder Crane
1. Product Overview
The LDP-type offset single-girder crane is designed and manufactured in accordance with national standard JB/T1306-94, and represents an upgraded generation of the LD-type electric single-girder crane. The entire crane features a box-type offset main girder, with the electric hoist running along the top flange of the girder. Compared to a standard single-girder crane, this design saves approximately 1 meter of headroom — making it an ideal solution for workshops with limited vertical clearance.
Available in 9 capacity ratings from 1 ton to 20 tons, with spans ranging from 7.5 to 35.5 meters, the LDP is particularly well-suited for applications where overhead space is constrained but maximum lifting height is still required.
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2. Specifications & Models
The LDP-type electric single-girder crane is available in lifting capacities of 1t, 2t, 3t, 5t, 8t, 10t, 15t, 16t, and 20t, with spans from 7.5 to 35.5 meters. The hoisting mechanism is equipped with either a CD1-type single-speed electric hoist or an MD1-type two-speed electric hoist.
3. Operation Modes
The LDP-type electric single-girder crane offers two operation modes — floor operation and cab operation:
- Floor operation: Wired pendant control or wireless remote control
- Cab operation: Open or enclosed cab, with side-entry or end-entry options
4. Technical Features
Integrated Three-in-One Drive System: Optional variable frequency speed control enables creep speed, single-speed, or two-speed operation, ensuring exceptionally smooth travel, hoisting, and positioning.
Multi-Function Protection: Equipped with overload alarm, skew-pull protection, two-stage anti-two-block protection for the hook, and phase-loss/overcurrent protection. The control grip (pendant) operates on a safe 12V circuit.
Offset Rail Design: The trolley travels along the top flange of the main girder, providing a wider wheel base and smoother operation — effectively eliminating the load swing commonly experienced with traditional LD-type single-girder cranes during hoist start/stop cycles.
5. Major Components
▎Box-Type Offset Main Girder
The main girder features a box-section, offset-rail configuration with the trolley hoist running along the top flange. Compared to conventional center-mounted designs, this structure offers a lower center of gravity and improved lateral stiffness, significantly reducing sway during operation. The offset rail design also maximizes the effective lifting height — for the same building height, the LDP delivers greater hook travel than a standard LD crane.
▎CD1/MD1 Electric Hoist
The hoisting mechanism comes standard with a CD1 single-speed hoist or an MD1 two-speed hoist. The two-speed version allows precise low-speed hook positioning during heavy-load placement — ideal for mold installation, equipment alignment, and other fine positioning tasks. The trolley features a widened wheel base, resulting in far less sway during start/stop compared to standard single-girder designs.
▎Electrical Control System
The control circuit operates on a safe 12V voltage, ensuring no electric shock risk even if the control grip or remote control is damaged or exposed to moisture. The electrical control box is fitted with phase-loss protection, overcurrent protection, and an overload limiter with four sensors. A variable frequency drive (VFD) can be optionally installed for stepless speed regulation of both hoisting and travel motions.
6. Application Scope
The LDP-type offset single-girder crane is widely used in factory workshops, warehouses, logistics transfer stations, and other general-purpose applications. Its offset rail design gives it a distinct advantage over standard LD-type cranes in facilities with limited overhead clearance.
Operating Environment Requirements: Ambient temperature -25°C to +40°C, free from flammable, explosive, or corrosive atmospheres. Not suitable for hazardous operations involving flammable/explosive materials, corrosive substances (acids, alkalis, plating, steam/moisture), electromagnetic environments, electromagnetic lifting, molten metal/high-temperature solutions, overload conditions, or explosive dust.
Structural Diagram
Technical Parameters
The following table outlines the key technical parameters for the LDP-type offset single-girder crane:
| Lifting Capacity Lifting capacity | 1,2,3,5,8,10,15,16,20 t | |||
| Span Span (m) | 7.5 ~ 35.5 | |||
| Lifting Height Lifting height (m) | 6 / 9 / 12 / 18 / 24 / 30 | |||
| Hoisting mechanism Hoist | Type Model | CD1 Single-Speed / MD1 Two-Speed Electric Hoist | ||
| Lifting Speed Lifting speed (m/min) | 0.5~5t | 8 (Single-Speed) / 0.8~8 (Two-Speed) | ||
| 10~20t | 7 (Single-Speed) / 0.7~7 (Two-Speed) | |||
| Lifting Height Lifting height (m) | 6;9;12;18;24;30 | |||
| travel mechanism Travel mechanism | Travel Speed Travel speed (m/min) | 20 | ||
| Electric Motor Motor | ZDY type Conical-Rotor Brake Motor | |||
| Operation Mode Operation | Pendant Control(Pendant/Remote Control)/ Cab Operation(Operator Cabin) | |||
| Work Duty / Classification Work system | A3 ~ A5 Medium Duty Fc=25% | |||
| Trolley / Cross Travel Type Trolley type | Under-Slung Rail Trolley / Cross Travel,Widened Wheel Base | |||
| Power Supply Power supply | Three-Phase AC Three-phase AC 380V 50Hz | |||
| Working Temperature Working temp (°C) | -25 ~ +40 | |||
| Application Crane Rail Rail type | I-Beam I-steel | |||
| Application Standard Standards | JB/T 1306-94 / GB/T 3811 Crane Design Standard-2008 | |||
8. Advantages & Disadvantages
Advantages: Overcomes the stability issues and limited effective lifting height of the LD Type Electric Single-Girder Crane. Saves approximately 1 meter of vertical space compared to the LD Type, offering excellent value for money.
Disadvantages: Lower work duty classification (A3~A5) makes it unsuitable for continuous heavy-duty operations in demanding workshops. For frequent heavy lifting applications, a Double Girder Crane with a higher work duty is recommended.
9. Applications & Customer Cases
▎Retrofitting Old Factory Buildings – A Space-Saving Solution
A machinery processing plant in Hebei had a building height of under 8 meters. Their old LD Type 5t overhead crane only provided a lifting height of 4.5 meters, leaving insufficient clearance for personnel to walk beneath suspended loads. After switching to the LDP under-slung model, they achieved a 6-meter lifting height in the same building, freeing up the space below for a walkway while lifting materials above – significantly improving space utilization. Following the retrofit, the workshop layout was reorganized, boosting overall logistics efficiency by roughly 15%~20%.
▎Warehouse Logistics – Wide Spans, Multiple Specifications
A steel distribution center in Henan needed overhead cranes for six warehouse bays with spans ranging from 10 to 20 meters. They selected five LDP models in 5t and 10t capacities, with spans varying from 15 to 30 meters. The LDP's under-slung design and box-type main girder eliminated the need for additional support columns in the warehouses, saving approximately 30% on civil construction costs.
▎Food & Light Industry – Light Load, High Frequency, Limited Space
A food additive plant discovered after construction that overhead piping consumed significant vertical space, leaving insufficient lifting height for a standard Single Girder Crane. Using the LDP 3t under-slung configuration, the top-running hoist increased the lifting height from 4 meters to 6.5 meters, perfectly meeting the requirements for lifting raw materials on the packaging line.
10. Why Choose Kelude Heavy Industry
The LDP under-slung Single Girder Crane is not a standard off-the-shelf product; span, lifting height, and hoist configuration must all be matched to the specific application. Choosing the right manufacturer is just as critical as choosing the right model.
- No Inflated Specifications: Every LDP we ship comes with a factory test report – including a 1.25x rated load test, recording three core data points: hoist deflection, trolley sway, and electrical insulation values. What you see is what you get – no inflated parameters to hit a lower price point.
- No Extra Charge for Non-Standard Specs: Non-standard spans (any dimension between 7.5 and 35.5 meters), special lifting heights, and adding VFD (Variable Frequency Drive) functionality are all handled as standard modifications without additional design fees. Send us your parameter sheet, and we'll provide a solution.
- Direct from the Manufacturer: Kelude is a manufacturer, not a trading company. LDP main girders are welded, shot-blasted, and tested in-house. Eliminating the middleman means more budget on your end.
Contact us directly with your workshop dimensions and lifting requirements. There is no charge until the solution is confirmed.
11. After-Sales Service
The LDP under-slung Single Girder Crane is covered by a free warranty for one year from the date of sale against any quality-related defects under normal operating conditions. Beyond the warranty period, we provide repair services, charging only for the cost of replacement parts.
Price Reference: A 3t × 10.5m LDP under-slung model is approximately ¥20,000–35,000, depending on the hoist configuration (Single-Speed/Two-Speed) and Operation Mode (pendant / Remote Control). Adding a Two-Speed hoist and remote control typically costs an additional ¥3,000–5,000 – not much more than a comparable LD Type, but you gain an extra meter of lifting height.
Delivery Lead Time: Main girder steel and hoists for common specifications under 5t are kept in stock. Shipment is 7–10 days after parameter confirmation. For special spans or units with VFD, lead time is approximately 12–15 days.
Selection Advice: You're choosing an under-slung model because of space constraints – when selecting the span, don't just look at the hook coverage; also account for the hoist's travel length on the crane rail to ensure it can reach the edges. Send us your factory drawings, and we'll check the dimensions for you in 10 minutes.
Request a Quotation: Send us three figures – Lifting Capacity (tons) + Span (meters) + Lifting Height (meters) – and we'll provide a solution and Quotation within 10 minutes. Phone: 13903802779
Parameter Specification Overview
FAQ
Q: What's the difference between the LDP under-slung Single Girder and a standard LD Type?
A: Structurally, the LDP uses an under-slung rail design where the hoist runs on top of the main girder, whereas the LD Type suspends the hoist beneath the girder. The most obvious difference is in lifting height – for the same building height, the LDP provides approximately 1 meter more effective lifting height than the LD Type. In terms of operational stability, the LDP features a larger trolley Wheel Base, resulting in significantly less sway during start/stop. Price-wise, the LDP is roughly 10%~15% more expensive than a comparable LD Type, but the savings from not having to raise the factory building far outweigh this difference.
Q: What is the maximum Span available for the LDP type?
A: The maximum Span for standard products is 35.5 meters. For factory buildings exceeding 35.5 meters in span, non-standard customization is possible, but we recommend keeping the Lifting Capacity under 10 tons – for large spans combined with heavy loads, the rigidity of the under-slung structure is inferior to a Double Girder, making a Double Girder overhead crane the preferred choice. Design & Manufacturing complies with JB/T 1306 and GB/T 3811 Crane Design Standard.
Q: How much does an LDP cost? How do I get a Quotation?
A: For a 3t × 10.5m configuration with a CD1 hoist and pendant control, the price is approximately ¥20,000–35,000. An 8t × 22m version with remote control is approximately ¥50,000–80,000. For an accurate quote, we need three parameters: Lifting Capacity (tons), Span (meters), and Lifting Height (meters), plus whether you require VFD or an Operator Cabin. Send these to us, and we'll provide a solution and Quotation within 10 minutes. Phone: 13903802779
