Vacuum Rotary Dryer Must Consider Hollow Shaft Sealing Effect

- Sep 17, 2018-

The vacuum rotary dryer is derived from a double cone mixer, which is mostly a cylindrical body and a two-headed cone. It is also commonly known as a double cone dryer. There are two hollow suspension shafts in the middle of the cone for the equipment to rotate the support and the passage of vacuum and hot water. The medicine rotates while drying in the dryer, which guarantees the uniformity of the whole batch of drugs. The heat medium enters the jacket from the hollow tube at one end, and the hot gas in the device is discharged along the exhaust pipe in the hollow tube at the other end, and the volatile solvent is recovered by condensation.


This equipment was developed by Shanghai Pharmaceutical Industry Research Institute in the 1980s. It was successfully tested on penicillin production and was quickly promoted in the national antibiotic industry. At present, there are many domestic manufacturers. Later, a multi-axis rotary dryer, a tilt rotary dryer and the like were introduced. The equipment is equipped with vacuum system, solvent recovery system, cleaning and sterilization system.


Because this equipment is easy to operate, batch production, easy to adjust, online cleaning and online sterilization, it is the preferred dryer for small and medium-sized antibiotic raw material medicine companies, such as penicillin, lincomycin, chlortetracycline, caffeine, etc. Use. When selecting the equipment, the concentricity of the two hollow shafts and the sealing problem of the hollow shaft are mainly considered. In order to ensure the smooth operation of the equipment, the concentricity requires that the shaft end runout amount is less than 0.01 mm. The sealing effect of the hollow shaft is mainly to prevent the lubricant or filler from contaminating the medicine.