The incorporation of ergonomic principles into machinery design is not merely a technical enhancement—it is an operational necessity that directly impacts productivity and the sustainability of the work environment.
Two of the most representative pieces of equipment reflecting this design philosophy are the clamshell grabs and orange peel grabs. Both are engineered to ensure optimal performance in demanding operations while minimising operator physical effort, reducing occupational hazards, and fostering a more intuitive interaction with the machine.
Clamshell Grabs: Robust Design with Precise Control
Clamshell grabs are specifically designed for loading and unloading bulk materials such as minerals, grains, biomass, fertilisers, and other granulated or powdered products. Their integrated electrohydraulic drive system enables smooth opening and closing with precise control from the crane, significantly reducing vibrations and impact during stacking or discharge operations.
From an ergonomic standpoint, this type of grab minimises the need for direct operator intervention and reduces mechanical stress on the equipment structure. The ability to customise the bucket’s volume and geometry according to the material being handled allows the effort required to be tailored to each specific operation, enhancing efficiency without compromising safety.
A notable variant is the amphibious clamshell grab, especially suited for work in port areas, dredging, or wet environments. Its sealed design and resistance to extreme conditions ensure reliable performance without compromising ergonomics or the structural safety of the unit.
Electrohydraulic Orange Peel Grabs: Versatility and Operational Safety
Electrohydraulic orange peel grabs are ideal for handling heterogeneous or irregular materials such as scrap, industrial waste, wood, or large blocks. These units allow fully autonomous operation from the control cabin, eliminating the need for manual intervention during loading and unloading.
Their design prioritises balanced weight distribution, with hydraulic cylinders enabling synchronised arm movement, ensuring a stable and secure grip even under adverse conditions. This configuration reduces the number of cycles required to complete each task, thereby lowering operator fatigue and enhancing workplace safety.
Additionally, the use of proportional valves and pressure sensors enables precise regulation of the grab’s closing force, adapting to the material's characteristics without requiring manual adjustments. This automation not only enhances ergonomics but also contributes to longer equipment life and fewer breakdowns caused by overstrain.
Automation and Ergonomics: A Necessary Integration
Ergonomic design in bulk handling equipment cannot be separated from advancements in automation and remote control. The implementation of simplified control systems, intuitive parameter displays, and automated responses to load conditions significantly reduces the number of physical actions required from the operator.
In equipment such as clamshell grabs and electrohydraulic orange peel grabs, the integration of autonomous electrohydraulic systems enables high-precision operation directly from the cabin, eliminating the need for manual adjustments or direct contact with the material. This not only improves the efficiency of the operational cycle but also drastically reduces personnel exposure to harsh environments such as dusty areas, high noise levels, or potentially hazardous materials. Furthermore, the ability to parameterise each movement based on load type offers finer control, reducing operational fatigue and enabling safer and more efficient decision-making.
Stemm: Committed to Our Clients
At Stemm, we understand that ergonomics is not an add-on—it is a core element in the design of our bulk handling solutions. That is why we develop equipment such as Clamshell Grabs, Amphibious Clamshell Grabs, Electrohydraulic Orange Peel Grabs, and Automatic Mechanical Grabs, with a clear focus on maximising safety, reducing physical strain, and improving the operational experience without compromising productivity.
Our commitment is to offer products that are not only robust and efficient but also safeguard the most valuable asset in any industrial operation: people. In every project, we apply this principle to ensure tailored, reliable, and safe solutions that meet the real demands of daily work. Because at Stemm, technology serves the operator.
