Sistemas Shuttle y AS/RS
4-Way · Pallet · Tote · Stack Crane

El 4-way tote shuttle is the highest-performance compact-load AS/RS system available. Each shuttle carrier travels autonomously on both X-axis (along the storage row) and Y-axis (cross-aisle), using onboard laser distance sensors for precise positioning to ±2mm. This allows a single carrier to serve every storage location on its level without returning to a fixed aisle — fundamentally different from older 2-way systems.

Multi-level deployments use dedicated vertical lifts (one per aisle end) to move carriers between levels, while I/O conveyors connect the racking system to goods-to-person pick stations. A WCS (Warehouse Control System) orchestrates carrier routing, lift scheduling, and conveyor sequencing in real-time. Systems typically run 4–12 carriers per level with fleet sizes of 20–200+ carriers depending on throughput requirements.

El 2-way (single-axis) tote shuttle operates along one row at a time, assigned to a specific storage lane by the WCS. It travels in and out along a fixed rail, making it simpler in construction and 20–35% lower in cost than a 4-way system. Best suited to warehouses with fewer active SKUs, deep storage lanes, and applications where FIFO (First-In First-Out) or LIFO buffer management is the primary objective rather than random-access throughput.

A 2-way system can be upgraded to 4-way by adding cross-aisle rail infrastructure — making it a logical entry-level choice for operations expecting to grow. Systems typically use one carrier per 2–3 aisles at lower throughput, reducing carrier count and WCS complexity versus 4-way deployments.

El 4-way pallet shuttle is the heavy-duty equivalent of the tote shuttle system, designed for full Euro and industrial pallets up to 1,500kg. El carrier uses a scissors-lift or chain-lift mechanism to raise the pallet, then traverses both along the storage row and across the aisle to access any pallet position in the racking. Laser ranging provides ±5mm positioning accuracy for reliable pallet fork insertion.

For cold chain applications at -18°C to -25°C, the carrier is equipped with a heated battery compartment, low-temperature lithium battery chemistry (operational down to -30°C), and NSF H1 food-grade lubricants on all bearing surfaces. El racking steel uses hot-dip galvanized profiles to resist moisture condensation corrosion in freeze-thaw cycles. Paired with cold-rated VFDs on the I/O conveyors, this creates a complete freeze-rated AS/RS system.

El radio shuttle is a semi-automated pallet storage solution that replaces conventional drive-in racking while using existing forklift operations. A remotely-controlled carrier vehicle (the "shuttle") rides on rails inside a deep storage lane. El forklift operator places the shuttle into the desired lane via RF remote or tablet app; the shuttle automatically travels to the optimal storage position and deposits or retrieves the pallet autonomously.

El primary advantage is eliminating the need for a forklift to drive inside the racking structure — a major source of racking damage and safety incidents in conventional drive-in setups. Radio shuttles also achieve 25–30% more pallet positions in the same footprint versus drive-in racking because no forklift clearance is needed between pallets. FIFO (First-In First-Out) layouts are available using a dual-entry lane configuration.

El bus shuttle system uses a central "bus" car — a single vertical lift vehicle that travels between all storage levels, carrying shuttle carriers from level to level. Unlike conventional multi-level shuttle systems that require a dedicated lift at every aisle end, the bus approach uses one shared lift per zone, significantly reducing infrastructure cost in mid-height warehouses (6–18m, 4–8 levels).

El attic shuttle variant is designed specifically for mezzanine warehouses where a storage deck is installed above an existing facility. Attic shuttles operate in the upper storage zone while pick stations remain on the ground floor. El shuttle feeds totes down to a gravity conveyor or belt system for retrieval. This configuration is popular in 3PL and food retail DCs where vertical space exists but full ASRS capital investment is not yet justified.

El stacker crane (stack crane) AS/RS is the industry standard for very tall, high-capacity warehouses — typically 15m to 45m in height. Each crane unit runs on a floor rail in a dedicated narrow aisle (900–1,200mm) with a mast-guided load handling device (LHD) that raises and lowers to access any storage level. A single crane serves one aisle, with cranes operating in parallel across multiple aisles coordinated by the WCS.

Stack cranes use absolute position encoders (or laser measurement systems) for horizontal travel and mast-mounted absolute encoders for vertical position — achieving positioning accuracy of ±5mm at heights up to 45m. Modern cranes use regenerative braking on the hoist motor to recover energy during lowering operations, reducing energy consumption by 20–30% compared to resistive braking designs. Both pallet and tote configurations are available; combined (dual-cycle) cranes can store one load while simultaneously retrieving another.

El EMS (Electrified Monorail System) shuttle complements stack cranes for cross-warehouse material transport. EMS carriers hang from an overhead electrified rail network and travel autonomously at up to 2.5 m/s, routing between production lines, ASRS I/O stations, and staging areas. El rail network can include switches and loops for complex routing configurations.