Vacuum belt dryer

Abstract

A vacuum belt dryer is disclosed which includes a cylinder body, multiple conveyor belt layers arranged inside the cylinder body, a feeding system and a discharging system. Conveying motors of conveyor belts convey a slurry raw material from feeding ends to discharging ends synchronously. The feeding system achieves material supplying through screw pumps and feeding branch pipelines, with the number of the screw pumps being same as the number of the conveyor belt layers. Swing arms on a vertical shaft and extending to feeding ends of the conveyor belt layers are driven to swing back and forthby a material paving motor through a crank. Material nozzles on the swing arms and communicating with the feeding branch pipelines uniformly arrange the slurry raw material onto the conveyor belts. The discharging system includes a discharging pipe in which a screw rod is arranged. A crusher, a first discharging valve, a middle storage tank, a second discharging valve and a powder outlet are arranged in order below the discharging end of the discharging pipe. The vacuum belt dryer can achieve automatic continuous drying, a high drying efficiency, uniform distribution of the slurry raw material, smooth discharging of a finished dried product, convenient maintenance, and good product quality after drying.

Description

technical field [0001] The invention belongs to the technical field of drying equipment, in particular to a vacuum belt dryer. Background technique [0002] The traditional Chinese medicine extraction process includes extraction, concentration and drying steps. The concentrated Chinese medicine extract is a viscous paste, which is not resistant to high temperature, some are highly viscous and easy to agglomerate, and some are thermoplastic or heat-sensitive materials; therefore, it is not suitable for It is difficult or impossible to use traditional dryers (such as spray dryers, ovens, etc.) for drying. However, the use of freeze-drying technology (such as low-temperature drying machines) not only takes a long time to dry, but also has low drying efficiency and high energy consumption, and the drying degree of the product is uneven, which affects product quality. At the same time, some dryers cannot achieve the purpose of continuous drying. [0003] Therefore, the vacuum b...

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Problems solved by technology

[0004] The disadvantages of the above patented technology are: 1) The raw material is sprayed on the uppermost conveyor belt, the spraying height is small, the spray drying effect is not significant, and the slurry raw material is easy to spray to both sides of the conveyor belt and fall to the bottom of the cylinder, resulting in waste and needs to be cleaned regularly ;2) During the process of the dried raw materials falling from the upper layer to the lower layer, some of them have agglomerated and are easy to fall on the outside of the conveyor belt. In addition, the distribution of raw materials falling on the lower conveyor belt is uneven, which affects the drying effect; 3) Dried The material is agglomerated, and there are problems such as unsmooth discharge; 4) The diameter of the cylinder cover can reach about 3 meters. During maintenance or inspection, a large and heavy cylinder cover needs to be designed with a cylinder cover lifting frame

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