The loading and unloading truss manipulator represents the most direct and efficient approach to automating sheet metal flow in laser cutting operations. Unlike articulated robotic arms that require complex programming and extensive floor space, the truss manipulator operates on an overhead gantry system that maximizes floor space utilization while delivering precise, repeatable material handling. Herochu’s Loading/Unloading Truss Manipulator has been developed as a complete solution that addresses both loading and unloading tasks through a purpose-designed composite truss manipulator.

System Architecture and Design Philosophy

The Herochu Loading/Unloading Truss Manipulator is built around a double-sided gantry truss that spans the warehouse and laser shuttle table in one motion. This overhead bridge configuration eliminates the need for floor-mounted equipment that would compete for valuable production floor space. The truss structure supports transverse movement of the composite manipulator, enabling coverage of the entire storage and loading footprint.

The system consists of a three-dimensional storage material warehouse, a bilateral gantry truss, separate loading and unloading truss manipulators (or a single composite head depending on configuration), a double-layer finished material truck, and a PLC control system—all coordinated to form a sheet metal automatic production unit. This integrated approach ensures that material flows continuously from storage through cutting to finished part staging without manual intervention.

Dual-Manipulator Configuration

What distinguishes the Herochu Loading/Unloading Truss Manipulator from single-function automation is its parallel dual-manipulator architecture. The system is equipped with independent loading and unloading manipulators running on bilateral guide rails, enabling concurrent operation: loading fresh raw sheets while simultaneously unloading finished cut parts or skeleton frames. This parallel operation reduces machine idle time between cutting cycles by up to 25%, delivering a significant productivity advantage over sequential loading and unloading systems.

The loading truss manipulator utilizes vacuum or magnetic gripper technology to pick the top sheet, performs automatic sheet separation (fanned or magnetic), and places it on the laser shuttle in less than 45 seconds. The unloading truss manipulator removes cut parts onto a dual-layer finished-material truck while skeleton waste is dropped into an optional scrap bin—all without stopping the laser. This continuous material flow ensures that the laser cutting machine operates at maximum utilization.

Technical Specifications and Configurations

The Herochu Loading/Unloading Truss Manipulator is available in multiple configurations to accommodate different production requirements. Standard specifications include sheet dimensions of 3015, 4015, 4020, and 4025 mm, with maximum load capacities ranging from 100 kg to 500 kg. The system features a maximum feeding width of 3×1.25 m and a minimum feeding size of 1.25×1.25 m.

The truss manipulator achieves a repeatability of ±2 mm, ensuring precise sheet positioning that eliminates the need for edge-finding routines. The system operates on an air supply of 0.6–0.7 MPa with air consumption of 1.5 m³/min. The PLC control system features Siemens S7-1500 architecture with Profinet communication to the laser, HMI recipe management, and an OPC-UA interface for MES integration.

Intelligent Control and Automation Features

The Herochu Loading/Unloading Truss Manipulator is governed by an intelligent PLC control system that provides real-time diagnostics, visual and audible safety alarms, and seamless integration with laser cutter controllers. The system’s control architecture enables:

• Automated Material Retrieval: The system retrieves sheets from storage based on production schedules, ensuring that the correct material is always available for the next cutting cycle.

• Real-Time Inventory Management: The system tracks material usage and can interface with ERP systems for automated inventory replenishment.

• Recipe Management: The HMI interface allows operators to store and recall cutting recipes, reducing setup time between jobs.

• Safety Interlocks: The system includes comprehensive safety features that protect both operators and equipment.

Operational Benefits

The primary advantage of the Herochu Loading/Unloading Truss Manipulator is its ability to transform a laser cutting machine from an intermittent processor into a continuous production asset. By automating the loading and unloading phases, the system ensures that the laser remains firing while the manipulator prepares the next sheet or removes finished parts.

For sheet metal fabricators, this translates into several measurable benefits: reduced labor costs through the elimination of manual handling positions; improved safety by removing operators from the loading and unloading zone; consistent quality through repeatable, precision positioning; and increased throughput through reduced machine idle time.