Single & Double Tower The Evolution of Metal Storage – Sheet Metal & Pipe Storage Racks Manufacturer

Automated sheet metal material storage systems have evolved from simple static racking into intelligent nodes within the digital factory ecosystem. Herochu’s RRW series represents the forefront of this evolution, offering two distinct architectures: the single-tower and the double-tower. Each configuration is optimized for different production scales, sheet dimensions, throughput requirements, and budget constraints. Despite their differences in layout, both systems share a common DNA of quality and functionality. They are constructed from high-tensile steel, feature powder coating for corrosion and ESD protection, utilize a screw assembly for reconfigurability, and are available in 8-layer configurations with adjustable bay heights. This modular approach ensures that whether a customer needs a compact solution for a small workshop or a high-throughput system for a large fabrication plant, the Herochu RRW series has a tailored fit.

Core Technology: Single-Tower vs. Double-Tower

The single-tower RRW model is the workhorse of the series, designed to handle sheets up to 4000×2000 mm. For facilities dealing with oversized materials, an extended version is available that accommodates sheets up to 8000×2500 mm. Each level supports a selectable capacity of either 3 tons or 5 tons, allowing customers to specify the load rating based on their specific material density. The tower operates with a single hoist that services all levels, making it ideal for small to medium warehouses where storage density is prioritized over rapid-fire throughput speeds.

In contrast, the double-tower sheet metal storage series introduces a sophisticated level of efficiency. This design utilizes two adjacent towers that share one central hoist mechanism. The front tower’s lower levels are connected to a loading station and a lifting mechanism, forming a buffer storage zone for material pallets. This architectural innovation allows for concurrent operations: while the hoist is depositing incoming sheets into the rear tower, it can simultaneously prepare to retrieve sheets from the buffer zone in the front tower. Compared to investing in two independent single-tower systems, the Herochu double-tower design reduces equipment and operational costs by approximately 25% while maintaining high retrieval rates. This makes it an exceptionally cost-efficient solution for high-mix, high-volume production environments.

Advanced Material Handling and Safety Features

Both configurations of the Herochu RRW series integrate advanced material handling features as standard. Sheet separation and double-sheet detection are critical components of the system. The separation mechanism utilizes air knives or mechanical lifters to create a gap between sheets, ensuring that only one sheet is picked from a stack at a time. The double-sheet detection employs ultrasonic or capacitive sensors that monitor the thickness of the lifted material. If the sensor detects two sheets, it triggers an automatic retry cycle, preventing the sheet from being fed into a laser cutter and causing expensive damage. These features are indispensable when the storage system feeds directly into precision machinery.

Safety is further enhanced by the powder-coated surface treatment. This process involves a zinc phosphate primer, an epoxy powder coat, and a clear topcoat, providing a defense-in-depth strategy against rust and chemical exposure. The ESD protection built into the tray surfaces prevents static discharge, which is crucial for protecting coated or anodized sheets from microscopic damage that could affect finishing quality.

Modular Design and ERP/MES Integration

Herochu engineers the RRW series for maximum flexibility through modular expansion. A single tower can operate as a standalone unit, managed by its own intuitive touchscreen panel. However, as production demands grow, the system allows for seamless scalability. Additional towers can be added alongside the existing structure, sharing the same rail system and hoist mechanism without major downtime or reconstruction. The double-tower model is also designed to accept third-party auxiliary equipment, such as automatic sheet feeders, deburring stations, or stacking robots, creating a fully automated production cell.

Connectivity is a hallmark of the modern automated vertical storage system. The RRW series supports standard industrial protocols such as Profinet, EtherCAT, and Modbus TCP. ERP and MES connectivity is expandable through a middleware gateway. This allows the system to function as a closed-loop node in the production network. For example, when an MES system schedules a cutting job, it sends a material ID to the storage controller. The controller locates the corresponding tray, retrieves it, and signals the MES when the sheet is ready for processing. Herochu has validated these interfaces with major ERP brands, including SAP and Oracle, ensuring plug-and-play compatibility with existing enterprise software.

Performance Data and Real-World Applications

The efficacy of the Herochu RRW series is proven in real-world applications across various industries. In a recent installation at a German automotive parts supplier, a double-tower RRW system managed 80 pallets of high-strength steel sheets. The facility operated three shifts, processing over 1200 sheets per week. The implementation of this automated sheet metal material storage system resulted in a 70% reduction in forklift traffic, significantly improving shop floor safety, and eliminated sheet damage caused by forklift tines. Retrieval accuracy reached 99.8%, with the rare errors traced to barcode misreads, which were subsequently resolved by adding RFID backup systems.

Another compelling case involves a Chinese HVAC manufacturer that stored aluminum sheets of 3000×1500mm. By implementing the single-tower model with 5-ton layers, they consolidated four sprawling floor-stacked piles into one compact tower, freeing up 200 square meters of floor space for additional assembly lines. The anti-rust properties of the powder-coated trays were essential, as aluminum stored in humid conditions is prone to developing white rust, which compromises brazing quality. After one year of operation, the manufacturer reported a 45% drop in the reject rate from brazed joints.

Economic Justification and Conclusion

Calculating the return on investment for automated sheet metal material storage systems involves analyzing floor space savings, labor reduction, and material damage reduction. A typical single-tower RRW occupies just 6m² of floor space but provides the equivalent storage density of 50m² of floor stacking or 30m² of conventional pallet racks (when accounting for forklift aisles). Labor savings are realized by eliminating forklift-based retrieval and manual inventory counting. Herochu offers flexible acquisition models, including leasing options that cover installation, training, and remote support. The screw assembly design ensures that the system retains its value, as it can be moved to a new site for a fraction of the original installation cost. In conclusion, Herochu’s RRW series offers a flexible, certified, and durable solution that delivers measurable improvements in density, speed, and safety for modern fabrication shops.

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