LDO European-Style Electric Single-Girder Crane
The LDO European-style Electric Single-Girder Crane is designed and manufactured in strict compliance with FEM and DIN standards, featuring a low-headroom European-style electric hoist that reduces headroom by 15–30% compared to conventional models. This crane utilizes a modular design approach and finite element analysis to optimize the steel structure of the main girder and end carriage, minimizing steel consumption while maintaining structural strength. The use of high-strength steel (Q355B/Q420B) reduces the dead weight by 15–30% and the maximum wheel load by 10–35% compared to traditional LD-type cranes, effectively lowering the load requirements on the factory's runway beams and columns. Kelude's LDO European series covers lifting capacities from 2 to 12.5 tons with spans up to 25.5 meters, making it widely applicable in machinery manufacturing, logistics, and warehousing operations.
The LDO European-style Electric Single-Girder Crane is a compact electric single-girder lifting appliance designed and manufactured by Kelude Heavy Industry in full compliance with FEM and DIN standards. Equipped with a low-headroom European-style electric hoist and built on a modular design philosophy, this crane features a compact structure, advanced technology, and a refined appearance. The LDO European-style Single-Girder Bridge Crane is fitted with a low-headroom hoist trolley, and both the hoisting and trolley travel mechanisms are driven by variable-frequency drives. Compared to conventional cranes, it achieves the minimum possible distance between the hook and the wall, as well as the lowest headroom, enabling maximum lifting height and significantly improving workspace utilization. Thanks to its lightweight design and reduced wheel loads, the crane substantially lowers factory construction and operational costs.
Key Features and Performance Benefits
Lightweight Design with Reduced Wheel Load: The modular design and finite element analysis optimize the steel structure of the main girder and end carriage, minimizing steel usage while ensuring strength. The application of high-strength steel (Q355B/Q420B) reduces the dead weight by 15–30% and the maximum wheel load by 10–35% compared to traditional LD-type Single Girder Cranes, effectively reducing the load requirements on the factory's runway beams and columns, and saving on plant construction costs.
Compact Dimensions for Maximum Space Utilization: The minimal distance from the hook to the sides of the crane rail expands the hook's working range. The low headroom above the rail level allows for the same lifting height requirements to be met in lower-profile factory buildings. This compact design significantly improves space utilization within the facility, making it particularly suitable for retrofit projects with limited headroom.
Smooth Operation and Precise Positioning: Standard equipment includes a variable-frequency speed control system (with inverter drives for hoisting, long travel, and cross travel), offering a speed ratio of 1:10. Combined with the electrical anti-sway control function, this enables high-precision positioning of suspended loads, improving operational efficiency by approximately 15–20%.
Maintenance-Free Design: Core transmission components utilize ISO Class 6 hardened tooth flank ground gears, pre-filled with synthetic lubricating oil at the factory, requiring no replacement for 2 years under normal use. The wheels are forged and surface-hardened, and the hoisting drum is a rolled steel cylinder with a counterweight-class brake. The entire crane is designed and verified in accordance with GB/T 3811 Crane Design Standard, with a safety factor of ≥5 and a design life of ≥20 years, requiring only periodic maintenance.
Manufacturing Standards: The design, manufacturing, and inspection strictly follow GB/T 3811 Crane Design Standard and GB/T 14405, with additional secondary verification of key components against international standards such as FEM and DIN. Outsourced components are sourced from leading brands including Schneider, SEW-Eurodrive, and Luoyang Bearing, ensuring the overall quality of the crane.
Technical Parameters and Specifications
Lifting Capacity: Up to 12.5 tons
Span Length: Up to 25.5 meters
Work Duty: A3-A5
Ambient Temperature: -25°C to +40°C, Relative Humidity ≤85%
Applications: Suitable for warehouses, material storage, and general factory environments.
Selection Parameter Table
| Lifting Capacity(T) | Span LK(m) | Lifting Height H(m) | Lifting Speed(m/min) | Complete Machine Power(kw) | Complete Machine Dead Weight(t) |
|---|---|---|---|---|---|
| 2T | 7.5~22.5 | 6/9/12 | 0.8/5 | 4.5 | 1.35~6.95 |
| 3T | 7.5~22.5 | 6/9/12 | 0.8/5 | 4.5~4.9 | 1.45~7.15 |
| 5T | 7.5~25.5 | 6/9/12 | 0.8/5 | 7.55~8.65 | 1.85~8.75 |
| 6T | 7.5~25.5 | 6/9/12 | 0.8/5 | 7.55~8.65 | 2.45~9.95 |
| 10T | 7.5~25.5 | 6/9/12 | 0.8/5 | 11.9~13.4 | 2.45~11.25 |
| 12.5T | 7.5~22.5 | 6/9/12 | 0.4/4 | 13.5~15.2 | 3.15~12.85 |
Key Advantages of the LDO Electric Single-Girder Crane
The LDO European-style electric single-girder crane delivers standout performance in the following areas:
Technical Director's Note — Kelude Heavy Industry
"The LDO European-style electric single-girder crane truly shines in retrofit projects for older factory buildings. Take our recent project supplying six LDO5-19.5m units to a logistics park: the facility was built in the 1990s and originally designed for only 3t LD-type loads. By switching to the LDO series, we reduced the maximum wheel load per crane from 6.2t (on the original LD type) down to 4.1t — a 34% reduction — meaning the existing runway beams required no reinforcement before installation. The variable frequency inching function also enabled positioning accuracy of ±5mm when handling precision spare parts, improving operational efficiency by roughly 15%."
— Zhang, Senior Engineer, Kelude Heavy Industry Technical Department
- Optimized Structure: The main girder uses an optimized box-section profile with finite element analysis to precisely control stress distribution, cutting dead weight by 15–30% while maintaining stiffness to standard requirements (mid-span deflection ≤ L/800).
- Upgraded Drive System: The gearbox features hardened tooth flanks produced through carburizing and quenching with ground gears, achieving tooth surface hardness of HRC 58–62, transmission efficiency of ≥96%, and a service life three times longer than conventional soft tooth flank reducers.
- Energy Efficiency: Total installed power is reduced by approximately 15–20%, and the variable-frequency speed control system saves 20–30% more energy compared to fixed-speed operation. Based on an 8-hour working day, annual electricity savings range from roughly $450 to $1,200.
- Safety & Reliability: Standard equipment includes an overload limiter (110% alarm / 125% hoisting circuit cut-off), travel limit switches on all motions, emergency stop buttons, and phase-loss/overload protection.
- Premium Components: Key electrical components are sourced from internationally recognized brands including Schneider, SEW-Eurodrive, and Yaskawa, ensuring overall reliability and extended service life.
Technical Specifications & Customization Options
Work Duty Classification: A3–A5 (higher classifications available upon request based on operating conditions).
Ambient Temperature: Standard version: –20°C to +40°C; heat-resistant option for high-temperature workshops (up to 80°C); low-temperature version rated to –40°C for cold regions; corrosion-resistant coating available for coastal or humid environments.
Power Supply: Standard three-phase AC 380V/50Hz. Export projects can be adapted to target country voltages including AC 220V/415V/460V/500V/660V, with fullPower On commissioning completed before shipment.
Control Options: Standard industrial wireless remote control (range ≥100m in open areas); optional floor pendant or air-conditioned operator cabin; supports multi-crane synchronized operation and remote monitoring integration.
Hoisting Mechanism: Equipped with a low-headroom European-style electric hoist (CD1/MD1 wire rope hoist or chain hoist available as alternatives).
Crane Bridge Travel: Individually driven by geared motor units (all-in-one) for smooth start/stop without impact; wheel diameters from Φ200 to 500mm selected based on load requirements; wear-resistant wheel flanges available for heavy-duty applications.
Rail Specification: P18/P24/P30/P38 hot-rolled steel rails recommended based on maximum wheel load; square steel or I-beam rails also available. Complete rail clamps and buffers supplied as standard.
Main Structural Components
The LDO European-style electric single-girder crane consists of the following major components:
- Main Girder: Optimized box-section design or H-beam construction in Q355B or Q420B steel plate. Weld seams are subject to non-destructive testing in accordance with GB/T 3323. Surface protection: full shot blasting to Sa2.5 grade after welding, followed by a three-coat system — epoxy zinc-rich primer, epoxy MIO intermediate coat, and polyurethane topcoat — with total dry film thickness (DFT) of no less than 140μm. Salt spray test resistance: ≥500 hours.
- End Carriages: Welded steel plate construction with driven and idler wheel blocks. Wheels are manufactured from ZG50SiMn cast steel or 45# forged steel, heat-treated through overall quenching and tempering plus medium-frequency induction hardening on the tread surface, achieving a surface hardness of HRC 42–52 with a service life exceeding 5 years without replacement. End carriages are connected with high-strength bolts (grade 10.9) for easy installation.
- European-Style Electric Hoist: Low-headroom design featuring a conical rotor motor (Class F insulation, IP55 protection rating). Hoisting speeds available in dual-speed or variable frequency configurations. Wire rope complies with GB/T 8918 with a safety factor of ≥6.
- Electrical Control System: The main control cabinet integrates a PLC (programmable logic controller) and variable-frequency drives (VFDs), with pre-wired remote monitoring interfaces (Profinet/Modbus TCP) for data exchange with MES/SCADA systems. Control cabinet protection rating: IP54.
Typical Applications for the LDO Crane
The LDO European-style electric single-girder crane is widely used in the following scenarios:
- Workshop Material Handling: Raw material receiving, inter-process transfer, and finished product offloading in machining, assembly, and mold workshops. Lifting capacity: 2 to 12.5t.
- Warehouse & Logistics: Ideal for automated storage & retrieval systems (AS/RS), working with C-hooks, plate lifting spreaders, or coil clamps for efficient handling of coils, profiles, and containers.
- Factory Retrofit Projects: Where existing buildings have limited headroom or insufficient runway beam capacity, the LDO's lightweight design and reduced wheel loads provide the most practical solution.
- Production Line Integration: Can be combined with KBK light crane systems, column cantilever cranes, rail transfer carts, and AGVs to create a complete inter-process material flow solution.
Kelude Heavy Industry offers a complete turnkey service: site survey → solution design → non-standard customization → manufacturing supervision → installation & commissioning → TSG supervision inspection → operator training → after-sales maintenance. For special requirements such as extended lifting heights, non-standard spans, or corrosion-resistant / explosion-proof / high-temperature configurations, please contact our technical department for a tailored solution.
Kelude Heavy Industry · Specialized in Material Handling Solutions · Free Technical Consultation · Custom Quotations on Request
Frequently Asked Questions About the LDO Crane
Q: How do I choose between the LDO and LDX models?
A: The LDO is a European-style design (FEM/DIN standard) with a low-headroom European hoist, making it the right choice where factory headroom is limited. The LDX is a modern Chinese-standard design (GB standard with European engineering principles) that offers better cost-effectiveness and parts commonality. In short: choose the LDO when headroom is tight, and the LDX when budget is the primary concern.
Q: Can the LDO crane be built to non-standard spans?
A: Yes. Standard spans range from 7.5m to 25.5m in 1.5m increments. Non-standard spans can be manufactured to match your actual building dimensions (accuracy ±5mm). Custom spans require a fresh finite element analysis of the main girder, which adds approximately 5–7 working days to the delivery schedule. Kelude Heavy Industry provides on-site measurement services.
Q: Can this crane operate in high-temperature environments?
A: Standard working environment ambient temperature is -20°C to +40°C. For high-temperature workshops, a heat-resistant option is available (ambient temperature up to 80°C), featuring a high-temperature resistant motor (Class H insulation), heat shields, heat-resistant cable, and heavy-duty grease. For cold regions, a -40°C low-temperature type is offered (low-temperature lubricating oil plus heat tracing). For coastal or humid environments, an anti-corrosion option is available (C4–C5 anti-corrosion coating per EN ISO 12944).
Q: How do I select the right crane rail model?
A: Rail model is selected based on maximum wheel load: P18/P24 for loads up to 5 t, P24/P30 for 5–10 t, and P30/P38 for 10–12.5 t. Kelude supplies the full range of rail clamps, buffers, and rail joint accessories. An I-Beam rail option is also available (section modulus must be verified). Rail installation accuracy requirements: straightness ≤ 1.5 mm/m, span deviation ≤ ±3 mm.
