Cantilever Underhung Crane 1 Ton S3.6m H24m VFD

A cantilever design is used on this underhung crane because:

• Extends working coverage: The 0.3m cantilever on each side lets the hoist travel beyond the rail line on both sides — increasing the effective working width beyond the 3.6m span
• Narrow-bay fit: In narrow bays where the runway rails are close together, the cantilever lets the crane reach into areas that would otherwise be unreachable
• Obstruction handling: If a column, pipe, or structure obstructs one side of the bay, the cantilever lets the hoist reach around it
• Loading area access: The cantilever can extend over a loading dock, doorway, or machine where the main span cannot reach
• Small footprint: The 3.6m span and 1000mm total width fit compact workspaces

The cantilever is a specialized design that adds cost and complexity — it is used when the extra reach is essential, not as a general-purpose configuration.

VFD (Variable Frequency Drive) long travel with dual speeds (20/10 m/min) is specified on this cantilever crane because:

• Smooth acceleration and deceleration: VFD eliminates the abrupt start/stop of contactor control, reducing load swing and improving load stability — especially important for the cantilevered hoist position
• Precise positioning: The VFD allows stepless speed control from very slow (jog) to full speed (20 m/min) for precise positioning along the runway
• Dual-speed selection: The operator can select 20 m/min for rapid travel or 10 m/min for slower, more controlled travel — giving flexibility for different handling tasks
• Reduced mechanical wear: Soft starting and stopping reduces shock loads on the end carriages, wheels, and rail — extending service life
• High-lift stability: At 24m lift height, VFD travel helps control load swing and keeps the load stable during travel

Only the long travel is VFD in this configuration — the hoist and trolley may use standard dual-speed control, keeping the cost reasonable while providing the most important motion (long travel) with smooth VFD control.

The 24m lifting height is achieved through several design features:

• Extended wire rope reeving: The electric wire rope hoist is supplied with drum capacity and wire rope length designed specifically for 24m hook travel
• Guide system: The wire rope is guided along a controlled path to prevent slack or tangling at high lift
• Controlled lifting speed: The hoist uses controlled lifting speed at height to avoid load swing during the long travel
• High-bay crane design: The crane girder and end carriages are designed to fit high-bay workshops with the 767mm total height
• Reinforced lifting mechanism: The hoist motor, brake, and drum are rated for the extended reeving and duty cycle

High-lift cantilever underhung cranes are used in tall workshops, silos, pits, and vertical process equipment where a 24m hook reach is essential to reach loads at depth. For specialized high-lift applications with unusual building geometry, contact Yuantai for a feasibility review.

Eight numbers on this cantilever underhung crane drawing must match your workshop, or the crane will not fit or operate correctly:

If any of these differ from your workshop, tell Yuantai before ordering — each change affects price and lead time on the cantilever underhung crane.

The 767mm total height and 1000mm total width are specified to keep the crane compact while still providing the required capacity and cantilever:

• Compact profile: At 1t capacity and 3.6m span, the girder is relatively small — the crane can be designed with a low profile
• Low-headroom fit: The 767mm total height means the crane fits into buildings with limited headroom above the runway rail
• Narrow bay fit: The 1000mm total width means the crane fits into narrow bays where the runway rails are close together
• Cantilever compactness: The 0.3m cantilever on each side adds just 600mm to the span, so the total footprint stays compact
• High-lift advantage: The compact crane profile means that more of the building's vertical space is available for the 24m hook travel

This compact design is essential for high-bay workshops where every mm of headroom matters — the crane must fit above the runway while still allowing a long hook travel below.

No — this cantilever underhung crane is configured for indoor workshop use as a cantilever underslung crane or underhung bridge crane with cantilever. The crane runs on elevated runway rails supported by the building structure. Outdoor use would require:

• Different crane type: A gantry crane with ground rails and A-frame legs is usually more suitable for outdoor use
• Weather protection: Outdoor-rated electrical enclosures (IP55+) and anti-corrosion treatment — especially important for the VFD panel and hoist at 24m height
• Wind load design: Anti-wind devices and anchoring — critical at 24m lift height where wind loads on the load are significant
• Rain cover: Protect the crane, hoist, and electricals from rain and snow

For outdoor applications, consult Yuantai Cranes for a suitable gantry crane or a weather-protected cantilever underhung crane solution.

To avoid surprises at installation, these items are outside the cantilever underhung crane supply scope unless you specifically add them:

• Runway rail and rail fasteners
• Runway beam and building column reinforcement
• Building structural support for the crane wheel load — critical at 24m height
• Site power supply up to the crane isolator — including clean power for the VFD
• VFD panel installation space and cable routing along the runway
• High-bay structural verification (building clear height, roof truss capacity)
• Long wire rope replacement access provision
• Erection crane and site lifting equipment for high-bay installation
• Local electrical connection and permits

Because the cantilever underhung crane operates at 24m lift height, the building structure and installation access are critical — the runway beam and columns must support the wheel load at the wide span, and the installation must be planned for high-bay conditions. Yuantai can provide runway load drawings and installation guidance as optional items.

Send these eleven items and Yuantai will issue a free custom cantilever underhung crane CAD drawing and proposal within 24 hours:

1. Required lifting capacity (t) — e.g., 1t
2. Crane span (m) — e.g., 3.6m
3. Left cantilever length (m) — e.g., 0.3m
4. Right cantilever length (m) — e.g., 0.3m
5. Required lifting height (m) — e.g., 24m
6. Number of cranes required (e.g., 1 unit)
7. Building clear height and roof structure capacity
8. Power supply (V / Hz / Ph) — e.g., 380V 50Hz 3P
9. VFD scope — long travel only, or full VFD
10. Duty class — e.g., A3
11. Control requirement — e.g., pendant + remote

The more complete the list, the faster and more accurate the cantilever underhung crane drawing and quote.

This published cantilever underhung crane drawing and 3D rendering are a free technical reference — you may use them to plan your workshop and check fit. A project-specific cantilever underhung crane GA drawing and 3D model are also free for standard configurations. A design fee may apply only for complex high-bay conditions, non-standard cantilever lengths, specialized VFD requirements, or customized high-lift reeving design. The cantilever underhung crane drawing remains the property of Yuantai Cranes: unauthorized copying, use, or manufacturing without written authorization is strictly prohibited.