The phrase “suction crane” undersells what modern servo swing technology delivers. A crane lifts and transports; the Herochu servo swing steel plate suction crane for laser cutting machines does that plus positions material to sub-millimeter accuracy, synchronizes with machine controls, and protects operators and equipment through layered failsafe systems. It is material handling redefined as production infrastructure.
Beyond Lifting: Positioning as a Productivity Function
In laser cutting operations, the difference between a sheet placed at ±10mm and one placed at ±0.5mm is not merely cosmetic. Inconsistent positioning forces the nesting software to use conservative edge margins—wasting material that could be yield. When every sheet lands within tight tolerance of the programmed position, nesting can use tighter boundaries without risking that cut features fall off the sheet edge. Over thousands of sheets annually, the material saved from reduced edge waste alone can offset a significant portion of the automation investment.
The Herochu suction crane achieves positioning repeatability through servo encoder feedback, not operator eyesight. The swing arm rotates to the programmed angle; the vertical lift descends to the programmed height; the suction array engages the plate; and the arm delivers the sheet to the laser bed’s alignment features. No manual adjustment, no verification step, no judgment call.
Suction Array Design and Material Handling
The vacuum suction system uses multiple heavy-load oil-resistant cups configured for the specific plate dimensions and weight of each application. Cup count and diameter vary by model: HC-R3015-500 uses 15 cups of 200mm; HC-R3015-1000 uses 118 cups of 250mm. The higher cup density on the 1000kg model distributes lifting force across a larger area, preventing thin or large sheets from sagging or slipping.
Each suction cup is spring-loaded independently to conform to slight material warpage—a common condition in hot-rolled steel that has cooled unevenly. The independent open/close valve on each cup allows the system to maintain vacuum only where contact exists, accommodating sheets with cutouts or irregular edges.
The integrated sheet separation function addresses a persistent challenge in laser cutting feeder applications: double-sheet pickup. Oil film, static charge, or simple surface tension can cause two thin plates to adhere. If both enter the laser, the unfocused beam may mark or damage the second sheet, and the nozzle may collide with the unexpected material. Herochu’s separation function breaks adhesion before lifting, ensuring single-sheet delivery every cycle.
Safety Systems for Operator Protection
Laser cutting environments combine heavy moving loads, high-temperature processes, and personnel working in proximity to automated equipment. The Herochu suction crane addresses these risks through multiple independent protection layers.
Power-off retention: If electrical or pneumatic supply fails during handling, the vacuum system holds the plate on the cups for a minimum of five minutes. Operators have time to clear the area and restore utilities without a free-falling sheet creating a hazard.
Automatic braking: The servo axes are equipped with spring-applied, electrically released brakes. Any power loss—including E-stop activation, breaker trip, or cable failure—engages the brakes instantly, halting arm motion and securing the load.
Emergency stop protection: Readily accessible E-stop buttons halt all operations immediately when pressed. The dual-channel circuit meets Category 3 safety requirements per ISO 13849.
Visual and documentation controls: Safety warning labels, maintenance labels, and operation instructions are affixed at key steps. Gas pipes use standardized blue (intake) and red/orange (output) color coding, with labeled connectors for correct identification during service.
Control System and Operational Flexibility
The Omron CNC control platform provides intuitive operation through a touch screen PLC interface. Button function identifiers are bilingual (Chinese and English). The system operates in manual mode for setup and troubleshooting and automatic mode for production.
Installation and commissioning are performed by Herochu technical engineers who calibrate servo parameters and vacuum settings to the specific material mix and layout of each customer’s facility. This application-specific approach ensures the crane performs at specification from the first production cycle.
Key Specifications:
- Model options: HC-R3015-300 through HC-R4015-500
- Sheet dimensions: 3000×1500mm to 4000×1500mm
- Max load capacity: 300kg to 500kg (1000kg available)
- Rotation angle: ±60 degrees
- Rotary angular speed: 2-5 degrees per second
- Lifting stroke: 700mm
