www.ava-huep.com

Vertical mixers and dryers

Refits

Refitting of conical orbital screws-
- Mixers
- Dryers
- Coolers
- Reactors
with the AVA helix system

AVA is the market leader in the field of vertical conical mixers and dryers.
The AVA mixing helix system has proved itself in industry and has huge advantages over the orbital screw system. In order to also be able to update existing conical screw systems with rotary screws and internal angular geared base to the state-of-the-art without having to purchase new machines, AXA has developed a system whereby helix systems can be integrated into existing conical screw mixer and dryer housings.

Practical experience with the modification demonstrated the following advantages for the operator:

Maintenance and repair costs practically eliminated as the angular geared base systems are removed.
Increase in usable volume of the existing mixer / dryer of up to 30%.
Shorter mixing times due to application of the AVA mixing helix.
Treatment times reduced by up to a factor of 3 when drying, cooling and heating due to application of the AVA mixing helix.
Additional option to utilise agglomerate pulverisers directly in the product room in order to achieve a finer end product.
In comparison to screw mixers which require two drives (one for the screw and another one for the circulating operation), the AVA helix only requires one drive.
Mixer shaft and mixer helix can also be heated which enables approximately 5 - 6 times faster treatment times when drying, cooling and heating.

Installation of the mixing helix

Orbital conical screw mixers generally have a welded cover / dished boiler head and contain an inspection opening. This inspection opening is used to insert the completely pre-built insertable helix system where it is then welded to the container. The old existing flange feed-through for the shaft and seal is maintained for the new system. A new strut bearing and drive are mounted for this purpose.

The AVA mixing helix is self-centring and therefore essentially requires no additional bearing. The modification has already been performed extremely successfully on our customer’s machines for capacities up to 25,000 litres.

: Refits, modifications and helixes

Retrofitting on-site generally takes between 2 and 5 days, depending on the size of the machine.

If the product was required to agglomerate in the orbital screw apparatus, there is the possibility to additionally install a separately powered agglomerate pulveriser in the lower part of the AVA mixing helix system.

Machines produced by the following manufacturers can be modified:

Krauss Maffei
Hosokawa Nauta
Bolz / Summix
All other machines that work according to the orbital screw principle.

Experience shows that the required investment for the modification pays for itself within a period of maximum 12 – 36 months and that an increase in production is archived in addition.

Tests

We would be delighted to demonstrate the advantages of the helix system to you at our technology centre. Machines are available with operational volumes between 30 and 150 litres.

Profit from innovative technologies

Minimal risk of contamination
Shaft packing and bearings do not leak into the product.
The mixer intensity can be adapted to the product characteristics
Gentle folding or intensive blending canbe achieved, depending on the speed and design of the agitator.
Short drying times
Permanent blending and intensive contact between the product and the heated wall ensure for an above-average heat transfer.
Short mixing times
The entire product volume is integrated into the mixing process.
The dryer can be used as an evaporator
Suitably designed agitators are also ideal for concentrating liquids and elutriation.
Increased drying and evaporating capacities due to heated agitator
The agitator can be heated and shaped in such a way that an extremely high evaporation performance can be achieved.
Reliable and trouble-free maintenance
The simple design serves to minimise maintenance costs.