Vertical Eye-to-Sky Steel Coil Wrapping Machine: Turntable Kinematics and Automated Drop-Table Discharge
Resumen Ejecutivo
Handling heavy steel coils in an eye-vertical (eye-to-sky) orientation eliminates the dangerous and time-consuming upending step required by horizontal wrappers. FHOPE’s heavy-duty vertical coil wrapping machine integrates continuous orbital through-the-eye wrapping with an automated lowering drop-table discharge directly on the heavy-duty rotary turntable. Engineered for steel coils weighing from 2,000 kg up to 30,000 kg, the machine eliminates intermediate overhead crane rigging between packaging stages. This technical overview details the turntable drive mechanics, shuttle ring kinematics, protective packaging material compatibility, and baseline engineering specifications.
Machine Architecture: Three Synchronized Stations in One Footprint
Rather than transferring heavy slit coils across multiple conveyors, the vertical wrapping sequence completes entirely on a single structural station:
- Turntable Loading & Centering: The coil is lowered via factory crane (C-hook) or forklift onto the heavy-duty motorized turntable with its eye oriented vertically. Internal locating guides or optical perimeter sensors verify concentric alignment with the rotational axis.
- Synchronized Through-the-Eye Orbital Wrap: The wrapping ring (or C-type open/close orbital shuttle) indexes through the center eye. As the turntable rotates the coil horizontally at 2–10 RPM, the shuttle feeds stretch film, VCI anti-rust paper, or woven composite tape radially through the eye, creating a multi-layer, water-resistant overlap seal across both flat face edges and the core circumference.
- Automated Drop-Table (Bottom Opening) Discharge: Once wrapped and sealed by the integrated cut-and-clamp unit, a central hydraulic scissor lift or sectional drop-table lowers beneath the turntable plane. This clears radial clearance for walking-beam conveyors or automated coil transfer cars (Coil Cars) to extract the heavy coil horizontally without manual intervention.
Mechanical Kinematics: Rotary Turntable & Through-the-Eye Shuttle
Wrapping an eye-vertical coil requires coordinated dual-axis motion to achieve uniform tension across variable profile geometries:
- Heavy-Duty Slewing Bearing Drive: The main turntable is mounted on an oversized internal-gear slewing ring driven by an inverter-controlled motor (4.0 kW – 7.5 kW). Variable-frequency soft-start curves prevent shifting or edge scuffing on delicate cold-rolled or galvanized surfaces.
- Tension-Regulated Film Shuttle: The orbital tracking ring features a dual-core carriage supporting both stretch wrap (LLDPE 50–100% pre-stretch) and anti-corrosion barrier paper (VCI). Magnetic powder brakes maintain constant wrap tension (adjustable 200–800 N) across changing outer and inner diameters.
- Elimination of Secondary Handling: By integrating the lowering drop-chassis at the base, coils discharge directly at ground level, reducing cycle turnaround times by 40% compared to conventional crane-reliant wrapping pits.
Baseline Technical Parameters
| Especificación de ingeniería | Gama industrial estándar | Heavy-Duty Mill Customization |
|---|---|---|
| Peso de bobina aplicable | 2,000 - 15,000 kg | Configurable up to 30,000 kg (Reinforced slewing bed) |
| Diámetro exterior de la bobina (OD) | 1,000-1,800 mm | Engineered variants accommodate master coils up to 2,600 mm |
| Diámetro interior de la bobina (ID) | 508 mm / 610 mm (Standard mill hubs) | Minimum shuttle ring clearance down to 400 mm |
| Coil Width (Height on Table) | 300-800 mm | Monitored via vertical laser distance sensor |
| Velocidad del transbordador de anillo | 20 – 60 RPM | Variable overlap ratio (20% – 80% programmable via HMI) | | Material de embalaje. | LLDPE Stretch Film, VCI Paper, HDPE Woven | Dual-material composite wrapping in a single pass | | Tiempo del ciclo | 60 – 120 seconds per coil | Dependent on coil axial width and programmed overlap | | Integración de seguridad | Category 3 / PL d, CE, OSHA | Perimeter safety mesh, interlocking gates, dual-channel E-stops |
Controls, Safety & Interlocking Architecture
- PLC Recipe Storage: Controlled via Siemens S7-1200/1500 PLC paired with a 10-inch color HMI. Operators select pre-configured packaging recipes based on coil width and shipping tier (domestic transit vs. export container ocean freight).
- Optical Height & Gap Detection: Laser triangulation sensors automatically map the coil’s top face and inner hub diameter, ensuring the shuttle ring never contacts the steel core during fast travel.
- Caja de seguridad: The complete rotational zone is isolated within 1,800 mm interlocked perimeter fencing compliant with EN ISO 13849-1 y EN 415-10. Category 4 optical light curtains protect the discharge aperture, triggering Category 0 emergency stops if personnel breach the hazardous cell.
Engineering Selection FAQ
Q: Why wrap coils in the eye-vertical (eye-to-sky) orientation instead of eye-horizontal?
A: Slit coils exiting slitting lines or annealing furnaces are frequently handled eye-to-sky on pallets or roller conveyors. Wrapping them eye-vertical avoids the mechanical stress and risk of telescoping damage associated with tilting/upending before wrapping, saving bay space and cycle time.
Q: How does the bottom drop-table mechanism discharge the coil?
A: Rather than dropping the coil through an open void, the turntable features segmented support decks. At the end of the wrapping cycle, an integrated hydraulic scissor table or coil saddle rises slightly to support the coil, the mechanical lock opens, and the table lowers smoothly to transfer the coil onto an outbound floor-level conveyor or coil car.
Q: Can the machine apply both VCI anti-rust paper and stretch film simultaneously?
A: Yes. The orbital shuttle can be fitted with dual roll-dispensers, applying an inner layer of VCI protective paper against corrosion followed immediately by an outer, tensioned layer of LLDPE stretch film to exclude moisture.
Next Step & Project Sizing
- Submit Coil Envelope: Send your min/max coil outer diameter (OD), inner diameter (ID), width (height on turntable), and maximum payload weight to info@fhopepack.com.
- Review Layout & Foundation Plan: Receive a detailed 3D CAD dimensional envelope, floor-loading foundation calculations, and cycle-time simulation within 48 hours.
- Verify Material Handling Interface: Confirm infeed and discharge logistics (overhead crane C-hook, floor-level coil car, or motorized roller bed) with FHOPE packaging engineers.
Última revisión: 16/10/2026
