City vegetable Oil Company is a growing and dynamic company in Bangladesh. At the plant in Gandaria - Dhaka, beside the oil extraction activity, Peas and Mustard seeds are unloaded from ships then weighed and bagged.
The ships were unloaded mainly by hand, baskets or bags were filled and carried out of the vessel. Then the bag or basket emptied and returned to the queue.
NEUERO GSD 250/220 TA12
Material and air enters the intake nozzle and is separated at the cyclone/airlock. The material falls through the airlock and is picked up with the same air but now pushing the material. At the pressure cyclone, the material falls down and the air goes up.
At assembly of the pressure line of the mobile pneumatic conveyor.
Scale and bagging
A pressure cyclone at the end of the pressure line feeds a buffer hopper of the scales - bagging machines at 100t/h rate.
A question that many times is asked. Is it ethical to use modern machines in developing countries generating unemployment?
From the macroeconomic point of view, the use of a machine is freeing work forces to do other jobs. The short time fate of each person is in fact hard. This however is not consequence of the use of modern machines but wrong or poor investment in education.
Man is driven to realise jobs faster and cheaper, in this specific case reducing the food cost for the consumer as consequence.
This thoughts should be used for all kind of machines. Technology should be incentive and not blocked because it must also consider the total group of people in a society, not a specific one.
Mobile pneumatic conveyors type GSD have following typology:
NEUERO mobile pneumatic conveyor number typology
GSD 250/250 D TA8 DA7,5
I I I I I I Pressure boom length (m)
I I I I I Suction boom length (m)
I I I I Diesel or Electric motor
I I I Motor power in HP
I I Conveying pipe diameter
I Suction-pressure blower (in German Gebläse Saug – Druck)
The pneumatic mobile conveyor can be operated in three modes:
An intake nozzle with adjustable air inlet attached to a flexible pipe is showed in this figure.
TA12 boom is made in square profile with total of 12 m long and a telescopic range of 4m, luffing of 50° and slewing of 310° grant liberty of movements for operation.
Material is conveyed by air movement. 2 turbo blower connected in series bring the necessary air movement (volume and pressure). The air flow regulator has the property to maintain the air volume in a defined range, therefore adjust air speed and limit the power consumption.
Chassis with rubber tyres and brakes makes this equipment suitable for moving.
A pendant remote control for the movements of slewing (310°), luffing 50° and telescoping 4m.
Operation and Maintenance
Operation and Maintenance are key issues, specially in areas where parts are difficult to supply.
Pneumatic systems are simple and with less moving parts also less susceptible to breakdown. This is important because of ships cost.
Suction nozzle in the material moved by slewing, luffing and telescoping the boom. The movements are slow and the system is safe also for operators inside the hatch.
Simple and slow movements to move the nozzle into the material. The use of a pendant control with buttons is easy to learn. Normally a week should be planned for assembly installation and training.
The cost of such machines normally are questioned in cheap labour countries but the mobile units are a good solution for capacity increase and/or cost reduction.
The energy consumption must be taken into account. In places where energy is rare, a diesel powered machine can be used.
The enclosed system from the hatch to the bin, truck or other destination grant the product against contamination and losses.
Material is conveyed directly from the hatch to destination without material loss.
The use of a standard machine takes a benefit of reduced cost. A characteristic of pneumatic conveyors is the flexibility and adaptation to new layouts, specially important in fast growing facilities.