17-10-2016, 09:30 AM
Design of material handling system for specific / various applications such as chain and screw conveyors
1459311486-Designofmaterialhandlingsystemforspecific.pptx (Size: 145.48 KB / Downloads: 13)
Introduction
The industrial development has led to growth of the factory or plant size has created huge demand for the material handling systems.
Any material handling process consist of three activities.
Picking up the load.
Transporting the load.
Setting the load.
Material handling equipment ensures a constant load transfer between two or several point connected by the common activity.
It is important note that ,the transferring of load is not confined only to shifting of loads from place to place but also include loading and unloading.
Principles in selecting material handling equipment
Direction of load travel.
Length of load travel.
Type and properties of load to be handled.
Required load moving capacity unit.
Characteristics of production process.
Method of stacking loads at initial and final points.
Local conditions.
Initial and operational cost.
Objectives of material handling systems
Accuracy in Transporting loads to Destinations .
Precision in Pick-up of Loads.
Transporting loads in scheduled Time.
Transporting loads of Required Quantity.
Transporting loads without damage.
Automation with minimum manpower.
Low initial and operational cost.
Simplicity and easy maintenance.
Operational safety.
Types of Conveyors
Flat belt Conveyor.
Troughed belt Conveyor.
Blanket belt Conveyor.
Woven wire belt Conveyor.
Chain Conveyor.
Apron Conveyor.
Screw Conveyor.
Chain Conveyor
Chain conveyors consist of endless chain running over the drive or head sprocket and tail sprocket. The drive sprocket is coupled with drive unit.
The load carrying strand of chain is supported on the load carrying tracks, while the return strand of the chain is supported on return tracks.
Chain conveyors utilize a powered continuous chain arrangement, carrying a series of single pendants.
Advantages of C hain Conveyors
The chain conveyors display low stretchablity under load.
The chain conveyors can take impact load which are unsuitable to belt conveyor.
The chain conveyors can transport large loads.
The chain conveyors can be used at elevated temperatures.
There is no possibility of slip in chain conveyors.
Limitations of Chain Conveyor
Operation of chain conveyors require careful attention and regular lubrication.
At high operation speed , chain wear is significant. Hence chain conveyors are run at a maximum speed of 0.6 to 1.0 m/s.
Applications of Chain Conveyors
Mining .
Food processing.
Sewage treatment.
Timber harvesting.
Agriculture.
Textile machinery.
Car plants.
Advantages of Screw Conveyor
Screw conveyors can have multiple inlet and discharge points.
When a screw conveyor is used as a metering device, it is considered a screw feeder.
Screw feeders are used to initiate a material process by metering product from a bin or hopper.
Screw conveyors can provide an air lock between upstream and downstream equipment.