The structure is compact and it occupies small area; 
?The stay time of raw material in the helix bed can be adjusted and the operation is very convenient; 
?The stay material acts teh motion of circle at helix bed from up to low , at the same time the equipment can jump itself , so the contact surface between hot air and raw material increased too and the dry effect 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 to surface and shape of raw material basically . It can not only maintain the roundness of pill but also decrease the broken rate of pill .