The vibration bottom is set into horizontal circular vibrations by the laterally mounted unbalance vibrator. The vibrations are transmitted to the materials column via the relieving cone which is oscillating in the interior of the AZO vibration bottom. Thus the material is put in motion falling uniformly without the typical core flow or bridging challenges. The product reliably reaches the discharge through the ring gap. The intensity of the vibrations, which depends on the type of material and the required output, can be varied at the unbalance vibrator.