Because the hot air passes through the layer of raw material several tiers and acts counter motion towards the raw material, the heat exchanger is fully preferment and thermal efficiency is high.
The structure is compact and it occupies small area.
The stay time of raw material in thehelix bed can be adjusted and the operation is very convenient
The raw material acts the motion if circle at helix bed from up to low, at the same the equipment can jump itself, so the contact surface between hot air and raw material is increased too and the dry effects is strengthened.
The equipment is suitable for continuous operation because of continuous feeding and discharging raw material .Meanwhile it is easy to meet the requirements of "GMP"
It does not damage the surface and shape of raw material basically. It can not only maintain the roundness of pill but also decrease the rate of pills.

The wet raw material enters into helix bed from fed inlet at the top and moves along with the helix bed from up to low and make jumping to the bottom, under the effect of vibrating force and gravity and then it's discharger. Meanwhile clean hot air enters into it from the bottom of helix bed and carries out heat exchange with raw material on the helix bed fully and exhausts from the outlet at the top. In this way the dry purpose of wet raw material is realized.