For special applications, the rotary cascade design is adapted to provide a shortfall, or ‘Cruciform’, lifter configuration. Similarly, Rotary Cascade Coolers and Combined Dryer/Coolers are available as required. Rotary dryer is widely used for drying materials in the industries of cemet, mine, contruction, chemical, food, compoud fertilizer, etc. Feeding and discharging unit is installed with thermocouple to control drier temperature.
The dryer normally operates on a two fan, balanced draught system, whereby the gas inlet is maintained under slightly negative pressure to minimise air in-leakage. When drying (and/or preheating) materials which are unaffected by heat or exposure to a flame, an oil or gas burner can be arranged to fire directly into the drum. The combined effects of the very high temperature (800ºC-1300).
Rotary dryer machine is mainly composed of shell, back and forth supporting wheel, feeding and discharging unit and gear cap. The accessories which are not in the the scope of this machine include firebox, feeding and discharging equipment, dust catcher, etc. In both co-current and counter-current systems, the material is in direct contact with the hot drying gases, which are normally supplied as products of combustion from an oil, gas or solid fuel fired furnace in the temperature range 250ºC to 1000ºC, as required. Shafts were usually horizontal and overhead but occasionally were vertical and could be underground. Shafts were usually rigid steel, made up of several parts bolted together at flanges. The shafts were suspended by hangers with bearings at certain intervals of length. The distance depended on the weight of the shaft and the number of pulleys. The shafts had to be kept aligned or the stress would overheat the bearings and could break the shaft. The bearings were usually friction type and had to be kept lubricated.
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