01-12-2012, 05:38 PM
Belt Conveyor
[attachment=42147]
Application and Limitations
A wider range of material can be handled which pause problems in other transportation means. Belt conveyor can be used for abrasive, wet, dry, sticky or dirty material. The lump size of the transported material is limited by the width of the belt. Belts up to 3000 mm wide are used in mining industry.
Higher capacity can be handled than any other form of conveyor at a considerably lower cost per tonne kilometer. Conveyor belts with capacity of 11000t/h and even higher can be deployed to match with higher capacity mining machinery.
Longer distances can be covered more economically than any other transportation system. A single belt conveyor or a series of belt conveyors can do this. Belt conveyors can be adopted for cross-country laying.
By the use of many forms of ancillary equipment such as mobile trippers or spreaders bulk material can be distributed and deposited wherever required.
Limitations
The loading and transfer points need to be properly designed.
Numbers of protective devices have to be incorporated to save the belt from getting damaged by operational problems.
The belt needs higher initial tension (40-200% of useful pull).
The use of belt is restricted by the lump size. If the maximum diagonal of a irregular lump is X then the belt width (B) is approximately given by:
B>=Xa+200
Where, B: Belt width, mm X: Longest diagonal of irregular lump, mm
a: Factor to account for grading. a is taken as 2.5 for graded material and 3 for un-graded material. However, for particular material these values must be properly estimated.
Conveying of sticky material is associated with problems of cleaning and discharge causing poor productivity.
Higher elongation of the belt (4% elongation may take place at the working load).
Types of Belt Conveyors
Permanent: This type of conveyors is installed for the life of the mine. They are used in main line, slope, long overland installation, preparation plants and stockpiles.
Portable: These are characterised by relative ease of assembling and disassembling to facilitate advances and recovery in development and retreat operations in underground mining.
Shiftable: Used in continuous surface mining this type of conveyor is mounted on skid or supporting structures aligned together and the whole can be shifted transversely to follow the advancing working face.
High Angle Conveyor: These are special type of conveyor belt arrangement used for negotiating steeper angle of inclination. Such belts can work in slope up to 70-800. Sandwich belt conveyor is a type of such belt conveyor.
Cable Belt Conveyor: Where the belt is carried on moving wire ropes and the tractive force is applied through the rope to the belt is known as cable belt conveyor..
Pipe Belt Conveyor: The belt is made to form a pipe while running the main length of the conveyor. At the receiving and discharge end the belt is like troughed belt conveyor. They are suitable for having spillage free transportation and free from risk of polluting the environment.
[attachment=42147]
Application and Limitations
A wider range of material can be handled which pause problems in other transportation means. Belt conveyor can be used for abrasive, wet, dry, sticky or dirty material. The lump size of the transported material is limited by the width of the belt. Belts up to 3000 mm wide are used in mining industry.
Higher capacity can be handled than any other form of conveyor at a considerably lower cost per tonne kilometer. Conveyor belts with capacity of 11000t/h and even higher can be deployed to match with higher capacity mining machinery.
Longer distances can be covered more economically than any other transportation system. A single belt conveyor or a series of belt conveyors can do this. Belt conveyors can be adopted for cross-country laying.
By the use of many forms of ancillary equipment such as mobile trippers or spreaders bulk material can be distributed and deposited wherever required.
Limitations
The loading and transfer points need to be properly designed.
Numbers of protective devices have to be incorporated to save the belt from getting damaged by operational problems.
The belt needs higher initial tension (40-200% of useful pull).
The use of belt is restricted by the lump size. If the maximum diagonal of a irregular lump is X then the belt width (B) is approximately given by:
B>=Xa+200
Where, B: Belt width, mm X: Longest diagonal of irregular lump, mm
a: Factor to account for grading. a is taken as 2.5 for graded material and 3 for un-graded material. However, for particular material these values must be properly estimated.
Conveying of sticky material is associated with problems of cleaning and discharge causing poor productivity.
Higher elongation of the belt (4% elongation may take place at the working load).
Types of Belt Conveyors
Permanent: This type of conveyors is installed for the life of the mine. They are used in main line, slope, long overland installation, preparation plants and stockpiles.
Portable: These are characterised by relative ease of assembling and disassembling to facilitate advances and recovery in development and retreat operations in underground mining.
Shiftable: Used in continuous surface mining this type of conveyor is mounted on skid or supporting structures aligned together and the whole can be shifted transversely to follow the advancing working face.
High Angle Conveyor: These are special type of conveyor belt arrangement used for negotiating steeper angle of inclination. Such belts can work in slope up to 70-800. Sandwich belt conveyor is a type of such belt conveyor.
Cable Belt Conveyor: Where the belt is carried on moving wire ropes and the tractive force is applied through the rope to the belt is known as cable belt conveyor..
Pipe Belt Conveyor: The belt is made to form a pipe while running the main length of the conveyor. At the receiving and discharge end the belt is like troughed belt conveyor. They are suitable for having spillage free transportation and free from risk of polluting the environment.