The continuous (or ‘pug mill’) mixer model MAO/C gives a stream of mixed concrete based on volumetric proportioning. Material is fed into one end from two or more aggregate conveyors, cement screw feeder and flow-metered water. The powerful twin-shaft mixing action transforms the raw materials into a continuous stream of mixed concrete suitable for RCC (Roller Compacted Concrete), flowable fill and other less critical high-volume applications.
Description
The MAO/C is smaller and lower in cost than the MAO twin shaft mixer for an equivalent output, per hour.
POWER, SPEED AND RUGGEDNESS
Using the same principle and most of the same components as the MAO twin shaft mixer, the MAO/C continuous mixer is powerful, fast, rugged and requires little maintenance. Its bearings and shaft seals are the same as used in model MAO.
THOROUGH MIXING ACTION
The paddles in the MAO/C mix the concrete while conveying it down the length of the mixer and eventually out of the discharge door at the far end. Mixing is thorough and the resulting product is homogeneous.
SOLID RELIABILITY
Lubrication of the shaft seals is by the same grease pump as used in the MAO. The patented triple seals are good for many years of operation with no maintenance. Bearings and seals have positive separation, to eliminate contamination and wear of the bearing even if the seal should ever leak.
Applications are in high production of roller compacted road beds, mine backfill etc. Dump trucks can be filled by running the mix into a surge hopper while the trucks get into position. Alternatively, the whole system can be shut down while this takes place.
Extra-Rigid Tank
The stiffened frame of the tank eliminates the risk of deformation during the full load operation and guarantees the correct planarity of the shafts’ seals.
Shaft Supports and Seals
The modular support patented by SICOMA is made with two separate housings. The bearing is lubricated in long lasting oil bath. The seal, realised with the exclusive system of the counter-rotating disks, is lubricated with liquid grease using an automatic pump.
Mixing Paddles
They are in antiwear steel 20mm thick and are bolted to the shafts.
3-D Modelling
All MAO/C Mixers are designed and constantly improved with the use of three-dimensional modeling softwares.
Accessories / Options
Skip Hoist
The loading skip for the aggregates is available for the MAO mixers up to the size 6000/4000. The hoist has two grooved drums on the same shaft. The skip cable has an anti free-fall block in case of cable failure while two limit switches constantly check its tension. Upon request, the double speed for ascent and descent is available.
Swing Out Drives (Swod Option)
This unique option for SICOMA Twin Shaft Mixers was developed over the last years to make any maintenance to the shaft supports easier and faster . The full drive assembly (Motor, Pulleys and Gearbox) is hinged to the side of the mixer tank and it can be swung out easily without the need of cranes or any lifting device. In case of unplanned maintenance, the downtime for the plant is minimized, resulting in a extremely low maintenance cost.
Low Motion Drive
This option is based on an auxiliary motor which can rotate the shafts at low speed. By using a button switch, the mixer can be driven safely also with the inspection doors open. The cleaning as well as the regular maintenance (such as the periodic adjustment of the blades) are simplified and faster. The Control Panel for the Low Motion Drive is not included. We propose the Manual Control Panel of the Mixer which includes all devices to operate the Low Motion Drive.
Batch Feeding System
Due to the particular reinforced structure of the tank, SICOMA Twin Shaft Mixers can be equipped with a Batch Feeding System stacked on the mixer using the fixing plates on the tank frame without the need of any additional metal structures. This system is composed by a supporting frame, Aggregates Holding Hopper, Cement Scale, Water Scale and Air Bag. Being everything is preassembled at the factory before the shipment, the time for the onsite assembly is extremely short.
Black Box
The standard Alarm Box, usually supplied as a standard, can be replaced by the Black Box to record and process all signals coming from the several sensors and some signals from the control panel. The detection and record of the alarms have to support the operator in the maintenance of the mixer, by giving specific reminders on the regular maintenance set in the factory on the basis of the statistics on the mixers. The data can be downloaded using the two USB ports which allow the connection of memory devices (such as USB memory sticks) and the connection to a Personal Computer.
Manual Control Panel
The mixer can be equipped with the Manual Control Panel which can operate the mixer in Manual Mode with the following buttons: Start/Stop of the mixer motors, Open/Close Discharge Door and Emergency Stop. This Panel can also operate the Low Motion Drive, if present.
High Pressure Washout
Two high pressure water pipes are placed above the shafts with as many nozzles as the number of arms. These spray bars are operated by a gearmotor and rotate so that the jets reach every spot for an effective cleaning. The washout has to be carried out at the end of each mixing cycle and the waste water is used for the next mixing.
Reduced Discharge Door
The reduced size of the discharge door allows the use of a small discharge chute. As a consequence, the supporting structure of the mixer can be shorter compared with the standard twin shaft mixers.
Double Discharge Door
The mixer can be equipped with two independent discharge doors to pour the concrete in two different places. One of the limitations of the twin shaft mixers is then overcome.
Bomb Bay Door
All SICOMA Twin Shaft Mixers can be equipped with the Bomb Bay Door which allows the bottom of the mixer tank to be opened for nearly half of its surface. The discharge is extremely fast also in case of low slump concrete. This option is particularly important in case of RCC production and loading on dump trucks.
Technical Details
TECHNICAL DETAILS, ENGLISH / METRIC:
| MODEL | HOURLY PRODUCTION cu. yd/hr. cu.m/hr. |
HOURLY PRODUCTION ton / hour tonne / hour |
MIXING MOTOR HP / KW |
SHAFT SPEED rpm |
MIXING BLADES |
MAX. AGGREGATE SIZE inch / mm |
WEIGHT lb / kg |
| MAO/C 80 | 94 – 104 72 – 80 |
160 – 176 145 – 160 |
1 x 30 / 25 | 84 | 52 | 5.5 / 140 | 5512 / 2500 |
| MAO/C 100 | 117 – 130 90 – 100 |
198 – 220 180 – 200 |
1 x 40 / 30 | 110 | 52 | 5.5 / 140 | 5732 / 2600 |
| MAO/C 180 | 211 – 234 162 – 180 |
357 – 397 324 – 360 |
1 x 60 / 50 | 47 | 48 | 6 / 150 | 12,566 / 5700 |
| MAO/C 300 | 350 – 400 270 – 300 |
595 – 661 540 – 600 |
2 x 40 / 30 | 50 | 48 | 6 / 150 | 13,007 / 5900 |
Note that output is flow rate of concrete during continuous production; this is uncompacted concrete with 112 to 125 lb/cu. ft bulk density.
Applications
Types of Applications
The size of SICOMA Twin Shaft Mixers ranges from 1 to 8 cubic meters of compacted concrete output, covering every need of our customers in terms of production capacity. The excellent performance is recognized in the several application fields, in the Concrete Industry as well as Industrial Plants (waste treatment, chemical industry, glass industry). Depending on the type of application, all mixers can be equipped with several accessories and customized with many add-ons in order to achieve specific productivity, mixing quality and life expectancy requested in a certain field.
Type of Mixed Product
- Ready-mix concrete
- Precast Concrete
- Dry Cast
- Roller Compacted Concrete (RCC)
- Self-Compacting Concrete (SCC)
- Fiber Reinforced Concrete
- Lightweight Concrete
- Backfilling
- Inertization
Type of Mixed Product
- Concrete / Cement Products (Blocks, Pavers, Curbstones, Sleepers, Pipes, Rings)
- Precast Elements (Beams, Hollow Core, Safety Barriers, Wall Panels)
- Dam Construction
- Road Paving
- Industrial Floors
- Architectural Precast
- Waste Treatment
- Foundries
- Glass Industry
- Mine Industry (muds treatment, backfilling)
- Soil Stabilization
- Fertilizers
Please Contact Us for your specific application – We provide solutions for each application.
