fluid · 05 2024 15 Spektrum ventional, steel or stainless steel standard-compliant fastening accessories and can also be retrofitted if required. Hose mounting version An NRC clamp version, designated as the NRC-H, is available for fastening hydraulic hoses. Vibration reduction has a further benefit here: hose wear is minimised because constant micro-vibrations at the hose-clamp connections can cause melting at the contact ends, placing a heavy load on the hose material. This damage pattern is additionally prevented by the two-part elas- tomer insert protruding slightly beyond the clamp body at both sides. This aspect is often even more important for machine, plant and vehicle manufacturers than reducing operating noise. In principle, the contour of the insert for the NRC-H clamp has been adapted in such a way that it has the necessary clearance to change the outside diameter with pressure pulsations, and the hose remains securely fixed. Also for electrical cables and cable bundles In general, various models of plastic clamps can also be used for the protection or routing of electrical cables and cable bundles. This is a sensible (protective) measure in the conditions prevailing in mobile applications, e.g. on construction sites, and in view of the increasing equipping of electric diggers with sensors and actuators for automatic functions and preventive maintenance. For instance, Stauff has extended the range by a special clamp body version, type CHC, to fasten thermoplastic corrugated hoses, which are used to protect and bundle electrical cables. Last but not least, electrical cables can also be routed through tubes and thus are very well protected. The Australian company Safescape, for instance, uses this option in a high-performance vehicle with electric drive, specially designed for underground mining. Stauff Australia manufactured both the coolant lines and tubes to protect the electrical cables for the “Bortana EV” in its own Tube Bending Centre, and also supplied the appropriate fastening clamps. Overall consideration and optimisation of the line system It is not just the selection of the individual components, but, above all, consideration of the entire line system that helps to minimise vibrations and noise emissions. The movement of the hydraulic oil through lines and valves causes flow noises, which are amplified by turbulence, pressure fluctuations, and uneven flow conditions. The rapid opening and closing of valves and the associated pressure surges can cause noises that indicate that there is potential for improvement. The “quieter” the movement of the medium from the pump to the functional unit, the quieter the machine is. As part of its Stauff Line programme, STAUFF offers advice to OEMs at the initial concept and design phase and in the improvement of existing tube concepts – among other things with the aim of noise reduction. Pump manufacturers have also further developed their product range with the latest developments in mobile hydraulics and have reduced the volume of the loudest noise source after elimination of the combustion engine. rson In general, plastic clamps can also be used for the protection or routing of electrical cables and cable bundles. The NRC clamp ensures the mechanical damping of vibrations in the line and correspondingly reduced noise levels.
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