Rake vacuum dryer is a mechanical equipment designed by strengthening and improving various materials such as pulp, paste, granule, powder and fiber on the basis of related technologies at home and abroad. The following is a detailed introduction to the rake vacuum dryer:

I. Equipment structure

Rake vacuum dryer usually consists of drying chamber (vacuum tank), heater, vacuum pump, rake agitator (rake teeth and driving device), electrical control system, etc. Among them, the vacuum tank is a jacket wall heat transfer type, and its upper part is provided with a vacuum filter interface, a material inlet and a manhole.

Second, the working principle

Rake vacuum dryer is a kind of internal heating conduction vacuum drying equipment. When working, the material is added into the container, and the heat required for evaporating water is provided for the material by using heat conducting oil (or other heating medium). At the same time, the rake agitator continuously stirs the material, so that it moves alternately to the two ends of the equipment and the center of the equipment, and so on, so that the material is evenly stirred and the water is gasified. The vaporized water is pumped away by the vacuum pump in time. Due to the high operating vacuum, the saturated pressure of water vapor on the surface of the dried material is much greater than that in the evaporation space in the drying cabinet, which is beneficial to the rapid discharge of water in the material at a lower temperature and finally achieves the purpose of concentrating and drying the material.

Third, the equipment characteristics

Wide adaptability: Rake vacuum dryer is suitable for many kinds of materials, such as slurry, paste, granule, powder and fiber.

Good drying effect: through the joint action of vacuum environment and agitator, the material is evenly heated, with high drying efficiency and good drying effect.

Simple operation: The electric control system can control and adjust the temperature, vacuum degree, stirring speed and other parameters of the drying chamber, and the operation is simple and convenient.

Easy to clean: the interior of the drying chamber is smooth without dead angle, which is easy to clean and maintain.

Four, equipment classification and improvement

The rake vacuum dryer has been continuously improved, and targeted and adaptive improvements have been made to produce a number of variants. For example:

Rake-type percussion rod vacuum dryer: a model produced by adaptive improvement on the basis of ordinary rake-type vacuum dryer.

Blade Rake Vacuum Dryer: A model produced by improving the ordinary rake vacuum dryer in combination with the characteristics of large heat transfer area and fast drying rate of the blade dryer.

Double screw belt rake vacuum dryer: In addition to all the targeted advantages of ordinary rake dryer, the built-in positive and negative double screw belts are forced to turn and mix continuously, which makes it difficult for materials to agglomerate and agglomerate during the drying process. It is suitable for vacuum drying of loose materials that are easy to agglomerate and agglomerate. At the same time, it can be used as a mixer.

V. Application fields

Rake vacuum dryers are widely used in many fields, including but not limited to:

Food processing industry: it is often used to quickly dehydrate or dry materials such as dried vegetables and nuts in meat products, dairy baking, sweets and biscuits. In addition, it can also be used in the production of fruit and vegetable chips.

Drug production field: it can be used to prepare extracts of Chinese herbal medicines and powder preparations of some drugs. By controlling the temperature and pressure conditions, the quality and stability of products can be ensured.

Chemical industry: Some fine chemicals need precise control of environmental parameters to achieve the best results, and rake vacuum dryers also have broad application prospects in these industries. For example, it can be used to treat high-viscosity liquids or semi-solid substances for subsequent processing steps.

Six, daily maintenance

In order to ensure the normal operation and prolong the service life of the rake vacuum dryer, daily maintenance is needed. Specific maintenance measures include:

Operators should be certified after passing the examination, and should have "four understandings" and "three skills" (that is, understanding structure, principle, performance and use; Can use, maintain, and troubleshoot).

Preheat the dryer before it runs. When preheating, loosen the connecting bolts between the main machine and the chassis. The preheating temperature should be below 40℃ and the temperature rise should not be too fast. Tighten the bolts after preheating. The main points of material addition shall be put into trial operation, and it can be put into operation formally only if there is no abnormal phenomenon.

To sum up, the rake vacuum dryer is an efficient and adaptable drying equipment, which is widely used in many fields. By understanding its structure, working principle, characteristics and daily maintenance measures, the equipment can be used and maintained better.