Drymix Drying Silo
Drying silo maximizes capacity and return on investment
The value of an investment in a grain dryer is not determined solely by the purchase price but by how much drying and storage capacity the investment provides. The Mepu DryMix drying silo is designed to deliver as much capacity as possible in the most cost-effective way.
In traditional solutions capacity is tied up in separate process stages and pieces of equipment. In DryMix the entire silo volume actively participates in the drying and storage process. This means more usable cubic meters, better utilization rates, and more efficient use of capital.
One investment, many uses
The Mepu DryMix Silo combines drying, after-cooling, batch mixing and storage in a single system. Grain can be handled and stored in the same silo without extra transfers, saving time, energy and labor steps. Versatile use enables efficient utilization of capacity in different situations and across harvest seasons.
- Drying
- After-cooling
- Mixing
- Storage
When capacity matters, the solution is Mepu Drymix silo.
In agriculture drying silos are widely used for many reasons
Ensuring feed quality and safety: Drying prevents mold growth and mycotoxin formation in feed grain, which is critically important for animal health, production and welfare. Effective mixing guarantees a uniform grain batch. High-quality feed supports animal growth and milk production more efficiently.
Long-term storage and self-sufficiency: Dried grain can be stored safely for long periods, enabling self-sufficiency in feed production and reducing dependency on external feed markets. Farmers can use their harvest flexibly throughout the year.
Better market prices and flexibility: For grain destined for sale, a silo enables better sale prices by giving the farmer flexibility to time sales optimally according to market conditions.
Buffer silo: For short-term storage before the drying process.
Cost efficiency: A drying silo reduces the need for external drying services and the related transport and waiting costs, improving the farm’s overall profitability.
Mepu Drymix silos are designed to meet these needs efficiently and reliably. An advanced mixing mechanism and durable construction ensure every grain dries evenly, minimizing energy costs and maximizing crop quality.
| MODEL | volume [m3] | Ø [m] | Wall height [m] | height [m] |
|---|---|---|---|---|
| Drymix 1 | 1 057 | 11.16 | 9.17 | 12.42 |
| Drymix 2 | 1 745 | 14.515 | 9.17 | 13.30 |
Efficient mixing and even airflow ensure high-quality drying results
The performance of a drying silo is based on efficient and controlled airflow and effective mixing. Heated drying air is fed by a centrifugal fan under the perforated floor, from where it rises evenly through the entire grain mass. This distributes heat and airflow efficiently, improving drying results and helping to achieve uniform moisture throughout the silo.
Even airflow throughout the grain mass
A pressurized air chamber under the silo floor ensures drying air travels evenly through the perforated floor into the grain. Uniform airflow prevents the formation of wet spots and enhances the energy efficiency of the drying process.
Effective moisture removal
During drying the moisture released from the grain exits the silo via several routes. Integrated exhaust channels in the silo structure ensure moist air can escape unobstructed, maintaining an efficient drying process even with large grain volumes.
Better drying quality with lower energy consumption
Effective air intake and controlled moisture removal create optimal conditions for grain drying. The result is a uniform end product, lower energy usage and reliable operation in all conditions.
Multiple exhaust air paths
Eaves gap An elevated roof structure creates a gap between the roof and the silo shell. This allows continuous ventilation and effective removal of moist air.
Ventilation valves Roof ventilation valves increase ventilation capacity and ensure controlled moisture removal throughout the drying cycle.
Top-cone exhaust opening The elevated top-cone structure provides an additional exhaust route for moist air, improving airflow especially in the upper part of the silo.
Mepu Drymix mixing system
Mepu’s mixing system is designed to do one thing better than other drying silos on the market: mix the entire grain mass evenly. Independently moving mixing screws, a robust structure and a maintenance-reliable drive solution ensure efficient drying, even moisture distribution and dependable operation year after year.
The outer third of a drying silo can contain up to two thirds of the total grain mass. Therefore effective mixing in the silo edge areas is crucial to achieve an even drying result. This is not accomplished by other solutions on the market.
In Mepu’s mixing system each screw has its own work area so grain is mixed effectively across the entire silo. The result is faster moisture equalization and more uniform drying and mixing of the whole grain mass.
Independently moving mixing screws
Mepu’s mixing system uses large 150 mm diameter mixing screws that lift grain efficiently from the silo bottom to the surface.
Each screw has its own geared motor and independent movement. Independently moving carriers allow simultaneous mixing both in the center of the silo and near the walls. This mixes the entire grain mass effectively without dead zones. In other market solutions the screws begin to tilt during movement, which degrades mixing quality and slows drying.
Depending on silo size a single- or double-girder mixing system is used to ensure optimal performance in different sized silos.
Robust design speeds up mixing
Vertically moving mixing screws move grain effectively along the entire screw height. Large-diameter toothed screws transport more material per rotation, which speeds moisture equalization and improves drying process efficiency.
Even grain circulation helps achieve a more uniform final result and enables efficient use of the entire silo capacity.
Maintenance-reliable power transmission
The mixing unit travels along a rail that circles the silo wall and is powered by a geared motor. The solution does not require a slip ring for power transfer, reducing the number of wear parts, improving reliability and eliminating condensation issues that occur with slip ring solutions.
Each screw has its own geared motor without belt drives, making the construction simple, durable and easy to maintain.
Stable operation year after year
Balanced mixing screws, low rotational speed and a structure designed for heavy-duty use minimize vibration even in large silos.
Stable operation reduces component load, extends service life and ensures reliable performance from season to season.
- Working area of the inner auger: the inner mixing auger handles the central area of the silo on its own programmed path and moves back and forth along the boom on its own carriage.
- Radial movement of the inner auger: The inner auger moves in and out along the boom. This radial movement combines with the boom’s rotational motion and forms the auger’s actual mixing path in the grain mass.
- Working area of the outer auger: The outer auger handles the outer zone of the silo. Because the outer surface area and volume of grain are significant, a separate auger is required to ensure even mixing across the entire area.
- Main limit switch for 360° rotational motion when using two mixing augers
- – 6. Boom rotation back: The boom does not rotate continuously in the same direction, but changes direction and returns. The back-and-forth rotational motion reduces structural load and enables controlled mixing throughout the silo area. With four augers the motion is 180° and with two augers 360°
MEPU DRYMIX DRYING SILO ADVANTAGES
Efficient and even mixing:
- Drymix silos utilize an innovative mixing system: in the 11.14 meter silo two mixers in a single girder and in the larger 14.51 meter silos four mixers in two girders.
- Sturdy mixing screws combined with inner- and outer-ring rotation ensure very effective and thorough mixing.
- In the girder the mixing screw also produces lateral movement, ensuring mass moves evenly throughout the entire silo.
- Mixing reaches effectively all the way to the silo discharge screw, ensuring optimal drying of every grain batch.
Durable and STRONG mixing screws:
- Vertically moving screws are designed to withstand stresses from heavy masses without bending, ensuring uninterrupted operation and extending service life.
- Thicker mixing screws (150 mm) eliminate the risk of tilting. Thinner screws bend during mixing, causing uneven mixing and prolonging the mixing process.
- Screw motion is designed not to impose unnecessary stress on the silo structure, ensuring long equipment life.
- Mixing can start already during early filling when the grain layer is about 20–50 cm above the mixing screws. This initiates moisture equalization and grain circulation as early as possible.
Operational reliability and structural durability
- The toothed design of the screws creates space for grain to rise during rotation, promoting even mixing throughout the silo.
- A cable solution that allows 180-degree movement removes the need for fragile slip ring connectors. This reduces maintenance needs and improves operational reliability.
- Optimal screw rotational speed (RPM) ensures effective and energy-efficient operation.
Fast drying
- Drymix can efficiently dry even 25% wet grain, giving flexibility to harvest schedules and reducing dependence on weather conditions.
- A four-screw silo’s drying process maximizes throughput and efficiency during the season.
spreader PLATE
The distributor fills the silo evenly and helps mix grain already during filling. Its role is to prevent accumulation of fines and dust in the silo center and to ensure an even material distribution throughout the silo.
A frequency converter-controlled distributor allows steplessly adjustable rotation speed so distribution can be optimized for different grain types and operating conditions. Speed and operating time are easily adjusted via the control system.
FAN
A centrifugal fan blows heated drying air into the pressurized chamber below the perforated silo floor. Drying air flows through the perforated floor and distributes evenly through the entire grain mass. This improves drying efficiency and ensures more uniform drying results.
EAVES VENTILATION
The elevated roof forms an open eaves gap between the roof and the silo wall through which moist exhaust air can be removed evenly around the entire silo circumference. Any condensation forming on the silo roof does not fall into the grain but flows out through the gap. This supports efficient drying and uniform airflow through the grain mass.
TOP VENTILATION
The elevated top collar forms a continuous exhaust opening through which moist air is efficiently removed from the silo. The solution supports uniform airflow, speeds moisture removal and improves drying efficiency.
mixing system
Mepu’s mixing system is based on large 150 mm toothed mixing screws that lift grain efficiently from the silo bottom to the surface, ensuring even moisture distribution throughout the grain mass. Each screw has its own geared motor and independent movement, enabling effective mixing both in the center of the silo and near the walls. Balanced construction, low rotational speed and robust execution guarantee stable operation and minimal vibration.
discharge system
Silo discharge occurs in multiple stages using gravity and a discharge screw. Emptying begins by opening the central sump, after which the remaining discharge sumps are opened simultaneously. When gravity discharge ends, the sweep screw is checked via the maintenance door to ensure its path is clear. After this the sweep screw can be started for final emptying of the silo.
The system ensures efficient and controlled discharge of the silo and enables full utilization of the silo capacity.
Discharge stages
- Opening the central discharge opening (number 1)
- The remaining discharge openings are opened simultaneously (numbers 2, 3 and 4)
- When gravity discharge has finished, the maintenance door can be used to ensure the sweep screw’s path is clear. After this the sweep screw can be started for final emptying.
- Transporting the remaining grain to the discharge openings and complete emptying of the silo.
⚠️ Safety: Do not enter the silo while the mixer or discharge screws are running.
stairs
The drying silo is designed for safe use, maintenance and inspections. A spiral staircase to the silo roof provides sturdy and safe access to the top where the main inspection and maintenance points are located. The drying silo also has a large maintenance door in the silo wall and a separate service hatch in the roof, which facilitate access to the silo interior and maintenance points. An emergency stop button is located near the roof entrance so the equipment can be stopped quickly when needed.
A ladder inside the silo facilitates inspections and maintenance at different heights. A service platform on the roof provides a stable working area for inspections and maintenance tasks. If necessary, the silo can also be equipped with additional platforms to improve usability and safety, especially in large silos.
MIXING screws
A robust 150 mm mixing screw with a toothed thread ensures effective recycling of grain from the silo bottom to the surface. Its own geared motor, independent movement and balanced construction guarantee even mixing, low vibration and reliable operation.
CONTROL SYSTEM
The drying silo is delivered with its own control cabinet, which can be integrated into the Mepu Pro control center. The system is equipped with sensors that monitor mixer operation, prevent possible collisions and detect abnormal vibration. Centralized control enables management of drying, ventilation, heating, filling, mixing and discharge from a single system, making operation safe and effortless.
