YFM Fully Foldable Knuckle Boom Crane is a highly compact and flexible articulated marine lifting device. Its main boom and jib are connected via hinges, allowing the boom assembly to be fully folded and stowed closely against the base. Equipped with integrated telescopic sections within the folding boom, it balances compact dimensions and ample working radius.
Electric-hydraulic driven, the crane enables continuous 360° slewing, luffing, folding, and telescoping movements. It is specially engineered for offshore and marine environments with limited operating space.
YFM Fully Foldable Knuckle Boom Crane:
- Compact Structure: Minimal stowed footprint, ideal for confined spaces such as vessel decks, and easy for transportation.
- Flexible Lifting: Multi-joint movement enables lifting around obstacles, delivering close-range, wide-angle, and high-precision handling.
- Strong Lifting Capacity: Rigid hinged structure provides superior lifting stability at short radii compared with equivalent telescopic boom cranes.
- Efficient Operation: Synchronized folding, luffing, and telescoping movements ensure fast lifting cycle speeds.
- Materials: High-strength alloy steel such as Q355B is adopted for the main structure. Critical components, including seals and electrical connectors are made of stainless steel.
- Hydraulic System: Corrosion-resistant, wide-temperature hydraulic system as standard; core components sourced from well-known brands including Parker, Rexroth, and Danfoss.
- Electrical System: Key electrical parts supplied by reputable manufacturers such as ABB, Schneider, and Siemens.
- Steel Wire Rope: Swaged, non-rotating, steel core and hot-dip galvanized construction.
- Surface Treatment: Blasted to Sa 2.5 standard.
- Coating System: Zinc-rich epoxy primer: 85 μm DFTEpoxy intermediate coat: 125 μm DFTPolyurethane topcoat: 70 μm DFTTotal dry film thickness: 280 μm; salt spray resistance ≥ 3,000 hours.
- Spare Parts: Consumable spare parts (seals, limit switches) are standard components and locally available worldwide.
| SWL | See Loading Chart | |
| MAX. Working Radius | 12.5m | |
| MIN.Working Radius | 2.5m | |
| Hoisting Speed | 0～15m/min | |
| Hoisting Height | 30m | |
| Slewing Speed | 0～0.8r/min | |
| Slewing Angle | 360°endless | |
| Luffing Time | 60S | |
| Extension Time | 55S | |
| Working Condition | Heel/Trim,≤2°/≤5° | |
| Motor Power | 380v-11KW | |
| Design Temperature. | -35°to +40° | |
| Explosion-proof Grade | ExdI1BT4Gb | |
| Class | RMRS | |
Drawings of Fully Foldable Knuckle Boom Crane
Typical Application Scenarios
- Supply Vessels: When folded, this fully foldable knuckle boom crane occupies no effective space on the aft deck and causes no structural interference; when unfolded, it can perform lifting and handling operations for various material pallets.
- Tugboats: Installed behind the wheelhouse. In the folded position, the foldable boom crane height stays below the radar mast without obstructing navigation visibility. It can be rapidly deployed for anchor handling or mooring assistance.
- Fishery Administration / Law Enforcement Vessels: Used for launching small boats, trawling operations, or deploying inspection equipment. When folded, this marine crane can be stowed into hull grooves to reduce impact from wave slamming.
- Offshore Wind Farm O&M: Mounted on catamaran vessels. The folded design allows passage under bridges with height restrictions; when extended, it lifts spare parts and materials to wind turbine platforms.
Delivery & Training
- Lead Time: Normally 90~150 days for the fully foldable knuckle boom crane (subject to the crane's specifications)
- Documentation:
- Operation Manual: English version in Adobe PDF format, supplied with 3 CDs. Hard copies are available upon request.
Contents include: Introduction (general information), main data, technical description, preparation & installation guidelines, operating instructions, maintenance instructions, data sheets & spare parts information, parts lists, and drawings.
- Certificates: Provided as separate documents.
- Quality Certificate
- Certificate of Origin
- Classification Society Certificate (if applicable)
- Customs Clearance Documents: Commercial Invoice, Packing List, Bill of Lading.
- Installation & Training: Online installation guidance and training are available. On-site support can be arranged when necessary.
- Base Mounting Type:
- Welded type (for new shipbuilding)
- Bolted type (for ship retrofitting)
- Mobile base type (for temporary operation vessels)
- Installation Location: Ship side, stern, deck, top of engine room overhead crane, and other areas.
We only promise what we can fully deliver
YFM is committed to designing professional marine lifting solutions for you. Our guarantee is not just verbal, but backed by reliable quality.YFM maintains a complete quality management system and holds certifications from major international classification societies, including CCS, ABS, BV, RINA, DNV, LR, RS, NK, KR, etc. We also provide lifelong technical support - solid assurances you can count on.
You may share your specific vessel type, available deck dimensions, maximum lifting weight, and required working radius. We will deliver a preliminary solution complete with dimension drawings, weight schedules, and load curve charts. If the proposal does not match your actual working conditions, we will clearly provide professional revision suggestions.
👍 www.yfm-crane.com
👍 +86 15818704927
👍 anne@yfm-crane.com/info@yfm-crane.com
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