MAO | TWIN SHAFT MIXERS
The size of SICOMA Twin Shaft Mixers ranges from 0,65 cu.yd to 13,5 cu.yd of vibrated concrete output, covering every need of our customers in terms of production capacity. The excellent performance is recognized in several applications: production of Readymix Concrete, production of prestressed / precast elements, RCC concrete for dams, soil stabilization, but also in different sectors such as the inertization, waste treatment and chemical products. Depending on the type of application, the mixers can be equipped with several accessories and options to optimize their productivity, mixing quality and life expectancy. Whenever necessary, we work with our customers to develop new solutions that best suit their requirements.
The gearboxes of the mixing group are epicyclical type. The first reduction is carried out by a pulley transmission equipped with a constant-velocity universal joint to keep the shafts syncronised. The low input speed to the gearboxes allows the lubrication oil to work at low thermal load. The connection between the gearbox and the tank is made with the exclusive connection sleeve, developed over the years to make any possible maintenance to the shaft supports easier and faster. This sleeve can be disassembled easily giving access to shaft support and in case of maintenance, the downtime for the plant is minimized.
The mixer tank is lined with Ni-Hard Cast Iron of 530HB minimum hardness. The mixing arms, with a low profile to avoid material build up, are made in Spheroidal Cast Iron. The mixing blades are made in Ni-Hard Cast Iron of 530HB minimum hardness. The large number of blades, their position and their orientation guarantee the right combination between the effects of rolling and circulation of the material during the mixing action.
The stiffened frame of the tank eliminates the risk of deformation during the transport (also in container) as well as during the full load operation and guarantees the correct planarity of the shafts’ seals. The metal frame for aggregates hopper and the scales can be laid right on the mixer without additional supports.
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, based on the exclusive system of the counter-rotating disks, is lubricated with liquid grease under controlled pressure.
HYDRAULIC POWER PACK
The closing of the door is guaranteed by the pressure sensor included in the hydraulic circuit. In case of failure or blackout, a manual pump can be operated for the emergency discharge and closure.
The discharge door has a rubber seal that runs along its full perimetre. The eccentric rotation of the door sector guarantees that the rubber seal is always reached and compressed despite its wear and tear.
The grease needed by the seal to keep the counter-rotating disks lubricated, is provided by temporized pump to the progressive dispenser which uniformly distributes the necessary quantity of grease (0,21 oz./hr) to each seal. A high efficiency filter removes possible impurities when the grease tank is refilled through its proper connector.
The mixer is equipped with several sensors: thermal sensors for the motors and for the gearboxes, level gauges for the oil of the geaboxes and for the hydraulic power pack, level and pressure sensors for the automatic lubrication system. Upon request, Sicoma can supply the Black Box, an electronic system that records type, number and duration of possible anomalies and alarms during the operation of the mixer. The same device can be programmed for the preventive maintenance.
TOP COVER & INSPECTION PLATFORM
The high top cover (19,68 in) is equipped with two hinged hatches and does not have any post. It allows an easy access to the mixer for an accurate cleaning at the end of the shift or for both preventive and unscheduled maintenance resulting in a shorter shutdown of the plant. The inspection platform with stairs, included in the supply, is absolutely necessary for the safe inspection and maintenance of the mixer. Its effective modular design allows the installation to be extremely easy wihtout the need of any crane or winch.