Mixing Machines: Concrete batching plant with 375 to 4,500 m³ per hour
Rometa planetary or horizontal-shaft mixers (375–4,500 l) for continuous, homogeneous concrete mixing in any precast batching plant.
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Description
Rometa mixers (planetary or horizontal shaft, from 375 to 4,500 litres) are the heart of any concrete batching plant: they are used for producing concrete and precast concrete products (beams, blocks, pipes, kerbstones, pavers and slabs), with a mixing geometry and high power that ensure continuous, homogeneous mixing and consistently high concrete quality in every cycle.
The mixer's size is determined by the vibro-compressor machine it feeds and by the number of aggregates required for the pieces to be manufactured; when hoppers cannot be placed underground, a specific loading system is also needed. The quality of the pieces depends largely on the aggregates, their proportion and their mixing, so storage hoppers must be covered to avoid changes in moisture content.
Available in planetary version, from 375 to 3,000 litres, or horizontal-shaft version, from 1,500 to 4,500 litres, weighing between 900 and 16,000 kg depending on the model.
Technical specifications
Technical features common to the entire range.
Planetary
| Planetary models | 375 · 500 · 750 · 1,125 · 1,500 · 2,250 · 3,000 L |
|---|---|
| Planetary configuration | 3-arm satellite + 2 fixed arms |
Horizontal shaft
| Horizontal shaft models | 1,500 · 2,250 · 3,000 · 3,750 · 4,500 L |
|---|---|
| Horizontal configuration | 8+2+2 to 12+2+2 arms, double shaft, 60-90 s cycles |
Features & advantages
Key components of the installation.
- High-capacity gear reducer.
- Hydraulic equipment with manual gate opening.
- Available with or without Skip loader.
- Electronic cement scale, with water distribution in the mixer itself.
- Bolted plate lining with NI-Hard function.
Additional technical information about aggregates
How aggregate selection, classification and dosing affect concrete quality.
Selecting the right aggregates is essential for achieving good-quality final products: the goal is a piece with the hardness and mechanical properties required by international standards, using as little cement as possible. The amount of water is the most decisive factor, as it changes the aggregate and, with it, the machine's behaviour both when filling the mould and compressing the piece.
Main characteristics of aggregates
- Hardness
- Weight
- Finish
- Dimensions
The piece's weight should be kept as low as possible to ease transport and on-site placement.
Classification by grain size
- Fine aggregates: grain under 0.1 mm
- Sand: 0.1–5 mm
- Gravel: 5–8 mm
Aggregates cannot be larger than a third of the piece's wall thickness.
Dosing
- By weight: the desired amount of each aggregate is weighed
- By volume: the feed time of each aggregate is regulated (a simpler system)
For good dosing, three hoppers with aggregates of different grain sizes are recommended (two as a minimum), avoiding variations in moisture content.
Recommended mix
- 45% medium aggregate
- 40% coarse aggregate
- 15% fine aggregate
Powder helps the cement form a paste that properly binds all the grains: too little means more cement and water are needed, while too much prevents a strong piece, so it should not exceed 5% by weight of the total aggregates.
What you can manufacture
Real pieces made with the help of this equipment.
Frequently asked questions about this model
What types of mixer does Rometa offer?
The present document has no contractual validity
Interested in the Mixing Machines?
Our technical team will advise you on the ideal configuration for your project, with no obligation.
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