30-06-2012, 04:38 PM
Automated Material Handling Systems
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Conveyor Systems
Conveyors are used when material must be moved in relatively large quantities between specific locations over a fixed path.
Conveyors divided into two basic categories:
Powered conveyors
Non-powered conveyors.
In powered conveyors, the power mechanism is contained in the fixed path, using belts, rotating rolls, or other devices to propel loads along the path. They are commonly used in automated material transfer systems.
In non-powered conveyors, materials are moved either manually or by human workers who push the loads along the fixed path.
Types of Conveyors
A variety of conveyor equipment is commercially available. The following are the major types of powered conveyors:
In roller conveyor, the pathway consists of a series of tubes (rollers) that are perpendicular to the direction of travel.
The rollers are contained in a fixed frame that elevates the pathway above floor level from several inches to several feet.
Flat pallets carrying unit loads are moved forward as the roller rotate.
Roller conveyors are used in a wide variety of applications, including manufacturing, assembly, and packaging.
Single Direction Conveyors
Assuming the conveyor operates at a constant speed, the time required to move materials from load station to unload station is given by:
Where
Td = delivery time (min),
Ld = length of conveyor between load and unload stations (m),
vc = conveyor velocity (m/min)
Single Direction Conveyors
The flow rate of materials on the conveyor is determined by the rate of loading at the load station. The loading rate is limited by the reciprocal of the time required to load the materials
Rf = material flow rate (parts/min).
RL = loading rate (parts/min).
sc = center-to-center spacing of materials on the conveyor (m/part).
TL = loading time (min/part).
Automated Storage/Retrieval Systems
An automated storage/retrieval system (AS/RS) can be defined as a storage system that performs storage and retrieval operations with speed and accuracy under a defined degree of automation.
A wide range of automation is found in commercially available AS/RS systems. At the most sophisticated level, the operations are totally automated, computer controlled, and fully integrated with a factory.
Automated storage/retrieval systems are custom designed for each application, although the designs are based on standard modular components available from each respective AS/RS supplier.
[attachment=26350]
Conveyor Systems
Conveyors are used when material must be moved in relatively large quantities between specific locations over a fixed path.
Conveyors divided into two basic categories:
Powered conveyors
Non-powered conveyors.
In powered conveyors, the power mechanism is contained in the fixed path, using belts, rotating rolls, or other devices to propel loads along the path. They are commonly used in automated material transfer systems.
In non-powered conveyors, materials are moved either manually or by human workers who push the loads along the fixed path.
Types of Conveyors
A variety of conveyor equipment is commercially available. The following are the major types of powered conveyors:
In roller conveyor, the pathway consists of a series of tubes (rollers) that are perpendicular to the direction of travel.
The rollers are contained in a fixed frame that elevates the pathway above floor level from several inches to several feet.
Flat pallets carrying unit loads are moved forward as the roller rotate.
Roller conveyors are used in a wide variety of applications, including manufacturing, assembly, and packaging.
Single Direction Conveyors
Assuming the conveyor operates at a constant speed, the time required to move materials from load station to unload station is given by:
Where
Td = delivery time (min),
Ld = length of conveyor between load and unload stations (m),
vc = conveyor velocity (m/min)
Single Direction Conveyors
The flow rate of materials on the conveyor is determined by the rate of loading at the load station. The loading rate is limited by the reciprocal of the time required to load the materials
Rf = material flow rate (parts/min).
RL = loading rate (parts/min).
sc = center-to-center spacing of materials on the conveyor (m/part).
TL = loading time (min/part).
Automated Storage/Retrieval Systems
An automated storage/retrieval system (AS/RS) can be defined as a storage system that performs storage and retrieval operations with speed and accuracy under a defined degree of automation.
A wide range of automation is found in commercially available AS/RS systems. At the most sophisticated level, the operations are totally automated, computer controlled, and fully integrated with a factory.
Automated storage/retrieval systems are custom designed for each application, although the designs are based on standard modular components available from each respective AS/RS supplier.