7 Structure and function
100_0101_sf_0017.fm
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7
Structure and function
7.1
Scope of delivery
The internal vibrator is delivered completely mounted.
The scope of delivery includes:
Machine.
Operator's manual.
7.2
Application
Use the machine only as intended, see chapter Safety, Proper use.
Design - R with rubber seal cap
The machine is protected from damage of the formworks by the rubber seal cap.
7.3
Functionality
Principle
The machine is an internal vibrator which creates high-frequency vibrations in the vibrator head.
Concrete is deaerated and compressed in the effective range of the vibrator head when the vibrator head
is immersed into the fresh concrete.
The fresh concrete is simultaneously cooling the vibrator head.
Vibrator head
In the vibrator head, an electric motor drives an eccentric weight at approx. 12,000rpm (200Hz) and thus
generates precessions. By these precessions the vibrator head introduces vibrations into the concrete.
Inverter
The inverter comprises a current rectifier and a d.c.-a.c. converter monitored by an electronic control.
The current rectifier converts the input voltage (AC single phase) to DC voltage.
The d.c.-a.c. converter converts the generated DC voltage to three phase current (AC three phase).
When the machine is switched on, the control electronics provides a soft start and thus prevents critical
starting currents.
NOTES
The concrete is being compressed for as long as bubbles of air arise.
Summary of Contents for IEC
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