Knocker (vibration technology)
A knocker is a (mostly closed) device in which a piston is driven at high speed against an impact plate.
In practice, impact energies of 1 to 300 joules are achieved.
Knockers are mostly used to loosen buildup on walls, pipes or containers. In terms of their mode of action, they are comparable to striking a hammer.
The knocking process takes place in steps
- Loading: the piston is brought to the starting position
- Loaded: the piston is in its starting position
- Accelerate: the piston is accelerated
- Striking: the piston hits the striking plate
- Standstill: the piston sits on the impact plate
The piston is accelerated by springs or compressed air, depending on the design principle.