Through the application of sound design techniques and a thorough field testing program, Webster Manufacturing, Division of Webster Industries, Inc., has developed the FS of mechanical vibrating conveyors.
Model FSL Conveyors (Click Here)
Model FSM Conveyors (Click Here)
Model FSH Conveyors (Click Here)
The movement of material on the pan of a vibrating conveyor is dependent on the vibratory motion of the pan. On all Webster FS vibrating conveyors amplitude, direction and frequency of the vibratory motion are selected and controlled to give a gentle hopping action to the material being conveyed so as to minimize material and drive forces. The amplitude and frequency of vibration are also selected so that oversize motors are not required for starting.
When the stiffness of the flat springs which support and guide tre pan is elected so
the natural or resonant frequency of the pan-spring system is very nearly the same as the
operating frequency of the conveyor, most of the power required to vibrate the empty pan
is alternately stored and released by the springs. It is only necessary for the
drive to furnish the power required to overcome frictional forces and to convey material.
This results in minimum power requirements, minimum drive forces and a uniform
distribution of inertia forces over the length of the conveyor. All Webster FS
vibrating conveyors employ this principle of operations.
The springs used in the FS vibrating conveyors are fabricated of a glass filament
reinforced plastic which has extremely high flexural strength and excellent resistance to
heat , moisture and chemical attach, These springs are conservatively stressed and
will have an extremely long life if the conveyor is properly installed and maintained.
While very little driving force is required when a vibrating
conveyor is operating without load and at or very close to its natural frequency, the
conveying of material or a buildup of material on the pan will cause significant increases
in the driving force required if the amplitude of vibration is to be maintained. The
positive, eccentric type drives used in the FS vibrating conveyors will maintain constant
amplitude under the variations in loading which occur in normal operation.
These drives are equipped with heavy duty spherical roller bearings on
the eccentric shaft and with a steel encased rubber bushing at the pan end of the
connecting rod This rubber bushing reduces drive forces when starting and stopping,
eliminates the need for lubrication at this point and reduces the noise level of the
machine. The bearings used are designed so that they can not be damaged by excessive
lubrication.
The Webster FS vibrating conveyors are standardized, sectional conveyors. They are built in 10 foot long sections which are bolted together to make up a conveyor of the required length. Odd length sections are available for use at the ends of the conveyor when the length is not a multiple of 10 feet. The pans of the standard sections are fabricated of high-strength, low-alloy steel for resistance to impact, abrasion and fatigue. The thickness and cross-sectional dimensions of the pans for the various standard sections are shown on the following pages. Pans fabricated of other materials or having different dimensions are available.
Standard FS vibrating conveyors are unbalanced machines and must be installed on a substantial foundation or supporting structure which is usually at or below ground level. If the conveyor is to be installed on an elevated structure or if for some other reason it is necessary or desirable to reduce the dynamic reaction transmitted to the supports, it may be equipped with a heavy inertia base and soft isolating springs. This type of construction will reduce the forces transmitted to the support by 85%-95%.
Webster FS vibrating conveyor are available in two types, and the selection of the proper type is dependent on the temperature of the material to be conveyed. For materials whose temperature is no higher than 150°-200 °F, standard or non-expansion construction is used. For hotter materials high temperature or heat expansion construction is used. The high temperature type is designed so the pan is free to expand and contract and so the warpage of the pan is controlled. Air-oil mist type lubrication is available if required for hot, humid or very dirty locations.
A wide range of optional features are available for use with FS vibrating conveyors. Included are covers, side or bottom discharges, intermediate discharges with gates, pans with multiple compartments or channels, screen sections, non-magnetic pan sections for use with magnetic separators, non-metallic pan sections for use with metal detectors, steel pan liners for impact or abrasion resistance, rubber pan liners for wear resistance or noise reduction, special discharges for feeding process equipment and steel support structures.