Conveyor trough is designed to focus the content considerations
Air delivery slot design key consideration reads: air trough inclination; conveyors distance; conveyor trough width; need air; conveying material changes in direction; material
flow control; material bed surface air flow rate (in closed type air transport tank); power consumption
(1) the inclination of the air trough
Inclination of the trough according to the following main factors:
a. material fluidization characteristics. Fluidization characteristics determine the material trough must have a minimum inclination, may be the most important thing is the
material of the minimum fluidization air flow. When the minimum flow rate of a particular tilt angle (refer to the lowest air flow rate in practice), less than
This material does not flow forward tilt angle, unless and then increase air flow. In exchange for the higher air flow angle smaller, depending on the type of material and the
benefits obtained. It should be remembered that increasing the air flow will inevitably lose some of the benefits of the small tilt angle.
b. material inflatable extent and starting speed. If the material from a hopper or container, adding fluidization air trough, this material has the initial velocity, the speed
depends on the material of the gap size. The speed can not carry material along the ventilation chute moves a certain distance, the slip
Slot inclination angle than the natural angle of repose of material smaller. Moving distance on the starting speed, the tilt angle and the material nature of the difference
between the angle of repose of the material and in such conditions lose its fluidization velocity of the air.
Initial velocity of the flow of material on the Turn conveyor trough similar effect on a slight increase in the flow of air vent plate. If the feed is pre-fluidization, then for a
short trough can be beneficial, but the benefits of the long spout is too small.
c. hole plate breathability. The pressure drop of the air hole plate slightly larger than the air pressure drop across the board material layers. If the air pressure drop
through the vent panel is less than the pressure drop through the material layer is not sufficient to make the material completely fluidized, so we must increase the inclination
of the trough in order to obtain the
Required material flow.
d. the material flow. Increasing the inclination of the flow of material can be increased. In certain circumstances, the inclination of the trough increases from 4% to 6%, the
amount of air introduced into the same, the material flow can be increased to twice as much.
(2) changes in the transport direction
Fluidized material during transportation can turn downward or angled feed point and the unloading conveyor trough and the distance between hole plate to determine the final
choice of the type of arrangement. Any design can be the direction of flow of air needed trough. Some change in direction can be taken
Curved with a large tank, but is generally limited to a fiber fabric trough hole plate, using the minimum radius is usually 2m. In fact, the trough is generally 0 to 90 degrees
to change the angle between the appropriate direction by means of a conveyor can be directly slipped into the required slot outlet disposed at an angle other
A conveyor trough entrance.
(3) material flow control
Strict control of the fluidization air trough the flow of material is very difficult and long-term proper operation of the accuracy can be obtained, but not easy to obtain
accuracy of less than 1% by weight of a stable stream. Air flowing through the closed material flow trough through baffles to regulate, in the design of the range
From within a small fraction of all traffic to flow regulation.
Intermittent operation of the air regulating valve installed trough shall discharge end of the Airport conveyor trough, which can be completely shut off the flow to ensure that the
final volume and left in the unloading spout regardless of the height on the bed. If the valve is disposed at a certain distance from the discharge point where the trough
discharged from the amount of material of the valve
After leaving the material bed height. Material bed height and the inclination of the trough, and the input air volume and the kinds of the material being processed, the two
together of fact does not ensure a uniform batch batch operation.
In continuous feeding operation must control the amount of material added to the trough to prevent adding too much material cause obstruction.