Electric vibrator 14040850

externalmotorapplications

High frequency external vibrators are used in construction sites and precast manufacturing plants to obtain high quality exposed concrete products, with excellent aesthetic results and weather resistance. The vibration is transmitted to the concrete indirectly through formwork or molds. Like internal vibrators, external vibrators are also based on the principle of vibration produced by the rotation of an eccentric mass driven by a three-phase electric motor. Low-speed vibration (3,000 rpm) is mainly used in high-density and non-reactive concretes, as they allow rapid movement of aggregates. High-speed vibration (6,000 or 9,000 rpm) is recommended in low-density concretes and in applications where high surface quality is required. The ability to adjust both frequency and speed (from 0 to 9,000 rpm) ensures the perfect operating frequency. It depends on the type of concrete to be vibrated as well as the natural resonance frequency of the mold.