1. Vacuum tray continuous dryer
The vacuum type disc continuous dryer can be used for drying low temperature heat sensitive materials such as medicines, enzymes and the like. The entire operation is carried out under negative pressure. The wet material is added to the dosing device, and the material is uniformly added to the dryer through a continuous locker for drying operation, and the dried material is discharged from the discharge port at the bottom of the dryer. The moisture escaping from the material is recovered through a condenser and a solvent receiving tank.
2, double cone rotary vacuum dryer
Double cone rotary vacuum dryer is suitable for the concentration, mixing, drying and low temperature drying of powdery, granular and fibrous materials in chemical, pharmaceutical and food industries (such as biochemical products). It is suitable for easy oxidation and volatile. Strong heat sensitive, toxic materials and dryness of materials that do not allow damage to crystals. The belt/chain two-stage elastic connection method makes the equipment run smoothly. The specially designed process fully reflects the good concentricity of the two shafts. The heat medium and vacuum system use reliable mechanical seals or American technology rotary joints. The machine can be steplessly regulated and thermostat controlled. The heat medium is available from high temperature heat transfer oil, medium temperature steam and low temperature hot water. When drying viscous materials, the “copy board†structure will be specially designed for you in the tank.
3, vacuum 干燥 dryer
The vacuum kneading dryer is a conductive heat transfer dryer. The material is not directly in contact with the heating medium, and is suitable for drying a small amount of mud-like or paste-like materials which are not resistant to high temperature and easy to be oxidized, and the water content is 15% to 90%. The blades of the horizontal jaw mixer in the dryer are made of cast iron or steel and are mounted on a square shaft with half of the blades to the left and the other half to the right. The shaft speed is 7~8r/min, which is driven by the motor with gearbox. At the same time, the automatic steering device is adopted to change the rotation direction of the shaft and change the rotation direction of the agitator every 5~8 minutes.
4, plate vacuum dryer
The plate type vacuum dryer is also called a disc type vacuum dryer, and has been introduced in the drying monograph published in Japan. China's Shanghai, Shijiazhuang and other places have been successfully developed. It is a multi-layer fixed hollow heating disc (also known as a loading tray), which is developed on the basis of intermittently stirring and conducting the dryer, and has been comprehensively improved. Conductive-based drying unit.
5, low temperature belt continuous vacuum dryer
The low-temperature belt continuous vacuum dryer is a new concept of high-efficiency energy-saving drying equipment after repeated comparison of the advantages and disadvantages of conventional spray drying and freeze-drying in traditional Chinese medicine, western medicine, chemical, food, health care. In the drying of products such as products, spray drying is beneficial to the cost, but the solubility of the product, the original taste and the shape of the powder have large defects, and the products with slightly higher viscosity and heat sensitivity requirements are incapable. Conventional freeze-drying results in excellent product solubility and high quality products, but the yield is too low and expensive.
The various process indexes of the low-temperature continuous vacuum dryer are just between the above two kinds of equipments, which can make the inside of the dried product porous and loose, retain the original material properties of the product, and have a good appearance. Meet the processing requirements of a large part of heat sensitive materials.
The low-temperature continuous vacuum dryer breaks through the technical problem of continuous feeding and discharging under vacuum, and the static drying is successfully converted into dynamic drying. The production cost of the dried products is greatly increased while the production cost is reduced.
The low temperature continuous vacuum dryer is especially suitable for the drying of high viscosity, high fat, high sugar and other materials which are difficult to solve by spray drying and vacuum oven. And can maintain the stability and consistency of the product batch.
6, continuous vacuum dryer
Freeze-drying is a technique of drying by the principle of sublimation. It is a process in which the dried substance is rapidly frozen at a low temperature, and then the frozen water molecules are directly sublimated into a water vapor escape process under a suitable vacuum environment. The product obtained by drying is called a lyophilizer, and the process is called lyophilization.
The substance is always in a low temperature (freezing state) before drying, and the ice crystals are uniformly distributed in the substance, and the sublimation process does not cause concentration due to dehydration, thereby avoiding side effects such as foaming and oxidation caused by water vapor. The dry material is porous in the shape of a dry sponge, the volume is basically unchanged, and it is easily soluble in water and restored to its original state. Physical and biological denaturation of dry matter is prevented to the greatest extent.
There are heat carrier inlet and outlet pipes on each layer of heating plate. Generally, the upper layers are made of low-pressure saturated steam or hot water, hot oil in series, parallel or series-parallel input heating to control the temperature of each layer; and the bottom two layers are connected to cooling water. To reduce product temperature, recover heat and ensure quality. The heating plate is fixed on the frame of the cylinder at a certain interval and placed horizontally. The vacuum dryer is equipped with a cross arm frame in each layer, and the upper and lower layers are staggered and fixed at 45° on the central spindle, and the worm gear reducer, The drive of the continuously variable transmission and the motor rotates slowly at 0.6~3.7 (r/min). Each of the booms is provided with a plurality of detachable hoe-shaped rakes or flat squeegees arranged equidistantly. The 耙 leaf adopts hinged and reed oscillating structure, so that the bottom edge floats evenly on the disk surface, and the angle of the 耙 leaf can be adjusted arbitrarily according to the material properties to ensure that the material is continuously advancing on the disk surface.
The material to be dried is continuously fed from the top disc feeder to the inner ring surface of the uppermost first heating layer of the equipment, and under the mechanical action of the rotary rakes, while tumbling and stirring, moving forward from the inside to the outside , the zigzag is covered on the entire surface of the disk, and is heated by contact; then the material falls from the outer edge to the outer surface of the outer layer of the second heating plate below, and is moved from the outside to the inside under the action of the reversely mounted raft leaves. To the inner edge, fall to the inner ring surface of the third heating plate. By analogy, the materials are moved layer by layer from top to bottom, and are continuously heated and dried.
The evaporated moisture is mixed with the exhaust gas in the equipment and naturally discharged from the upper outlet. Finally, the dry material falls onto the lower tray, and is continuously discharged from the raking blade to the bottom discharge port to obtain a qualified dry product. According to product performance, drying requirements and processing capacity, the plate dryer adopts a series of steps such as stepless speed regulation of the spindle, manual adjustment of the height of the disc feeder to adjust the height of the heating plate, control of the temperature distribution of each layer of the heating plate, and final cooling and cooling. The superior performance of the plate dryer.
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Effervescent tablet tubes
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