Stacker Cranes

High-Density Vertical Automation for Intelligent Warehousing

Product Overview

Stacker Cranes, also known as AS/RS cranes or SRMs (Storage & Retrieval Machines), are automated vertical lifting systems that move goods between storage locations and input/output points within high-bay racking systems. LEADOR offers a wide portfolio of stacker cranes optimized for pallet storage, tote handling, or customized containers. Each unit integrates seamlessly with warehouse control systems (WCS), ensuring high-speed throughput and accurate inventory control.

Our cranes are engineered for performance in extreme environments, capable of operating at heights over 40 meters, with energy-efficient drive systems, twin-mast rigidity, and smart acceleration profiles to minimize sway and improve cycle times.

Introduction & Core Benefits

Leador Tech’s Stacker Cranes are the fundamental robotic machines at the heart of Automated Storage and Retrieval Systems (AS/RS). Operating on rails within narrow aisles of high-bay racking, these sophisticated machines are designed to automatically deposit and retrieve loads (typically pallets, cartons, or totes) from specific storage locations. Our stacker cranes feature advanced control systems, precise positioning technology, and robust lifting mechanisms, enabling 24/7 continuous operation with exceptional speed and accuracy. They are indispensable for industries requiring high-density storage, rapid order fulfillment, and impeccable inventory management, including e-commerce, manufacturing, automotive, and food & beverage.

Leador Tech’s Stacker Cranes enable the construction of high-bay, narrow-aisle warehouses, allowing you to store significantly more inventory in a smaller footprint. By reaching heights and densities unattainable by traditional forklift operations, our stacker cranes can reduce your facility’s required square footage by up to 50%, transforming unused vertical space into highly productive storage capacity.

Designed for speed and continuous operation, our stacker cranes execute storage and retrieval cycles at exceptional rates. Their ability to simultaneously perform dual-cycle operations (putaway and retrieval in one trip) dramatically increases throughput, directly supporting high-volume order fulfillment and manufacturing demands. This significantly reduces processing times and boosts overall productivity.

Leveraging advanced laser positioning, encoder feedback, and sophisticated control algorithms, Leador Tech’s stacker cranes achieve near-perfect positioning accuracy. This virtually eliminates human errors associated with manual putaway and picking, ensuring 100% inventory accuracy and significantly reducing product damage and mispicks, leading to fewer costly returns and improved customer satisfaction.

Automating storage and retrieval with stacker cranes drastically reduces reliance on manual labor for putaway, picking, and internal transport. This reallocates your workforce to more value-added tasks and eliminates human traffic in aisles, inherently creating a safer working environment by removing personnel from hazardous lift truck operations at height.

Integrated seamlessly with your Warehouse Management System (WMS), our stacker cranes provide real-time, accurate inventory data. Every movement is tracked, offering complete visibility into stock levels, locations, and movements. This empowers data-driven decision-making, improves stock rotation, and facilitates precise order fulfillment.

Overhead Conveyor Types

01. Unit-Load Stacker Cranes

Description: Designed for handling full pallets or large containers. These are the most common type for high-bay AS/RS, capable of reaching significant heights and carrying heavy loads. Applications: Raw material storage, finished goods warehousing, buffer storage, cross-docking points for heavy items.

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02. Mini-Load Stacker Cranes

Description: Specifically designed for handling smaller unit loads, such as totes, cartons, trays, or individual cases. They typically operate at higher speeds and acceleration/deceleration rates than unit-load cranes. Applications: E-commerce order fulfillment, component storage for manufacturing, buffer storage for small parts, kitting operations.

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Application Scenarios

Warehousing

Maximizes cubic storage in frozen environments

E-commerce

High throughput for bin picking and returns handling.

Manufacturing

Real-time part storage and retrieval to assembly lines.

Food & Beverage

Supports FIFO storage logic for perishable goods.

Features & Advantages
Modules & Collaboration

Key Features & Advantages As the central pillar of Automated Storage and Retrieval Systems (AS/RS), our precision-engineered stacker cranes offer lightning-fast, highly accurate, and fully automated handling of goods within tall, narrow aisle warehouses. Transform your logistics from chaotic to controlled, maximize vertical space utilization, and achieve peak throughput with a solution built for the demands of modern, high-volume operations. High-Speed Vertical Automation: With lifting speeds up to 120 m/min and travel speeds reaching 240 m/min, our cranes ensure rapid throughput in fast-paced logistics environments. Compact Aisle Widths Narrow aisle configurations (as low as 1,000 mm) enable higher storage density without sacrificing maneuverability. Energy Regeneration Systems Built-in regenerative braking feeds energy back into the system during deceleration, reducing overall power consumption. Precision Positioning Advanced laser rangefinders and encoder tracking ensure ±5 mm accuracy, critical for tight storage tolerances. Adaptability to Harsh Environments Optional insulation, heating systems, and corrosion-resistant components allow reliable use in cold storage, high humidity, or dusty industrial settings.

Core Equipment & Modular Components Leador Tech’s Stacker Cranes operate within a narrow aisle defined by high-bay racking. A mast-mounted carriage moves vertically, while the entire crane travels horizontally on rails. A telescoping load handling device extends from the carriage to deposit or retrieve unit loads from the racking.

Racking Systems: Custom-designed high-bay racking structures that define the storage locations.
Load Handling Devices (LHDs): Telescoping forks (single/double deep), shuttles, or specialized grippers for different load types.
Rails & Guidance Systems: Precision-engineered floor and upper guide rails for smooth and accurate crane movement.
Drive & Lifting Systems: High-performance servo motors, robust gearboxes, and precise lifting mechanisms for rapid acceleration/deceleration and reliable vertical travel.
Electrical Control Cabinets: Housing all power distribution, motor drives, and control modules.
Control Systems (PLC/PC-based): The on-board intelligence for crane operation, integrated with central WCS/WMS.

Technical Specifications

Parameter	Value Range	Engineering Notes
Max Lifting Height	10 – 45 meters	Tailored to facility height
Max Payload	50 – 1,500 kg	Depends on load handling unit type
Travel Speed	Up to 240 m/min	High-speed dual-motor drive
Lifting Speed	Up to 120 m/min	Acceleration managed via VFD
Aisle Width	1,000 – 1,500 mm	Narrow aisle cranes available
Operating Temperature	-30°C to +45°C	With heating/cooling options
Positioning Accuracy	±5 mm	Critical for dense bin or tote systems

Applications & Case Studies

Discover how Leador has empowered businesses to achieve their logistics goals. Explore our detailed case studies showcasing real-world implementations and measurable results

High-speed buffer storage for online orders, automated returns processing, rapid replenishment.

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Automated storage of raw materials, WIP, finished goods, and components for JIT (Just-In-Time) delivery

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Compatibility, Safety & Support

Leador Tech’s Stacker Cranes are engineered to be the physical embodiment of your digital warehouse, integrating seamlessly with your entire IT and operational ecosystem. Our advanced crane controllers communicate effortlessly with your WMS (Warehouse Management Systems), WCS (Warehouse Control Systems), and ERP (Enterprise Resource Planning) systems via industry-standard protocols (e.g., OPC UA, TCP/IP, Profinet, Ethernet/IP). This enables real-time inventory updates, optimized storage strategies, and precise order fulfillment execution, providing unparalleled visibility and control over your automated warehouse.”

Safety is non-negotiable in high-bay automation. Leador Tech’s Stacker Cranes are designed with multiple layers of safety features and adhere to stringent international machinery directives and safety standards . This includes comprehensive guarding, emergency stop systems, anti-collision technology, load monitoring, and redundant braking systems, ensuring the utmost protection for personnel and assets. Their robust, precision-engineered components guarantee maximum operational reliability and minimal unplanned downtime, critical for operations.

Leador Tech provides complete, end-to-end support for your Stacker Crane and AS/RS investment. Our services encompass initial site analysis, detailed system design, and simulation to professional installation, rigorous commissioning, and comprehensive operator and maintenance training. Our dedicated global service network ensures rapid response times for technical assistance, remote diagnostics capabilities, and efficient on-site support. We also provide tailored preventive maintenance programs, software updates, and guarantee timely spare parts availability to maximize your system’s uptime, extend its operational lifespan, and ensure sustained peak performance for decades.