Divided into internal vibrators(poke vibrators),surface vibrators(screed vibrators),among others.Internal vibrators transmit vibration directly into the concrete via the vibrator head.The core mechanism is an eccentric weight rotating at high speed.High frequency(typically 8000-15000 rpm)effectively overcomes concrete viscosity.Flexible shaft types are agile and lightweight;direct-driven types are more durable.Good sealing prevents ingress of cement paste.Anti-vibration design protects the operator.
Internal vibrator heads are distinguished by their diameter(e.g.,φ30mm,φ50mm,φ70mm),which determines the effective radius of action.Vibration frequency is a key parameter.Amplitude(centrifugal force)is also important.Flexible shaft length is typically 4 or 6 meters.Motor power ranges from 1.1kW to 3kW.Surface vibrators are specified by plate size and centrifugal force.
Internal vibrators are used in almost all structures requiring concrete compaction:beams,columns,walls,slabs,foundations,etc.Surface vibrators are for large horizontal surfaces like floors,pavements,and roads.External vibrators attach to formwork for thin-walled or heavily reinforced precast elements.It is a crucial tool for ensuring concrete placement quality.
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