Small vacuum rake dryer

Product Introduction of Small Vacuum Rake Drying Machine

In the fields of pharmaceuticals, fine chemicals, biotechnology, food and new material research and development, gentle, efficient and pollution-free drying treatment of heat sensitive, high value-added, easily oxidizable or highly viscous materials is a key link in laboratory research, pilot scale and small-scale production. In response to the problems of high drying temperature, long drying time, material agglomeration in traditional ovens, as well as low efficiency and uneven heat transfer in ordinary vacuum drying, we have launchedSmall vacuum rake dryer——A intermittent vacuum conduction drying equipment designed specifically for small batches and high demand materials. This device, with its unique internal stirring structure, fully enclosed vacuum environment, and precise temperature control system, is an ideal choice for processing paste, slurry, powder, and crystalline materials.

1、 Equipment Overview and Scope of Application

This small vacuum rake dryer has an effective capacity ranging from 5L to 100L, suitable for scientific research institutions, university laboratories, and small and medium-sized pharmaceutical factories with a daily processing capacity of 0.5-20kg. Typical applications include:

• pharmaceutical industryLow temperature drying of antibiotics, vitamins, traditional Chinese medicine extracts, protein drugs, and concentrated solutions before freeze-drying;
• fine chemicalsSolvent removal treatment of dye intermediates, catalysts, high molecular weight polymers, and lithium battery material precursors;
• Food and Health ProductsMild dehydration of natural pigments, probiotic concentrates, plant extracts, and collagen;
• New materials field: Drying and forming of nano powder, ceramic slurry and graphene dispersion.

Especially suitable for materials with the following characteristics:
✅ Thermal sensitivity (decomposition temperature<80 ℃)
✅ Easy to oxidize (requires inert gas protection)
✅ High viscosity (prone to crust formation, poor heat transfer)
✅ Toxic or odorous (requires sealed operation)
✅ Need to recycle organic solvents (such as ethanol, acetone, ethyl acetate)

2、 Working principle and core structure

The equipment adoptsJacket heating+internal rake teeth stirring+high vacuum suctionTrinity drying mechanism:

1. Cylinder structureHorizontal cylindrical jacket container, made of SUS304 or SUS316L material, with mirror polished inner walls to effectively prevent material adhesion and cross contamination;
2. heating systemThe jacket is filled with hot water, steam, or thermal oil to uniformly heat the material through conduction, avoiding local overheating;
3. stirring deviceInstall multiple sets of "W" - shaped or anchor type rake teeth on the spindle, rotate at low speed, constantly flip the material, update the heated surface, and enhance heat and mass transfer;
4. vacuum systemStandard dual stage rotary vane vacuum pump, optional Roots pump or condensation recovery device to achieve efficient solvent recovery;
5. 出料方式Bottom quick opening butterfly valve or manual discharge port, supporting closed docking with the next process;
6. control systemIntelligent temperature controller+vacuum gauge+timer, capable of setting drying temperature, vacuum degree, stirring speed and running time. Some models have been upgraded to PLC touch screen control.

When working, wet materials are added to the cylinder, the feeding port is closed and vacuum is applied. In a negative pressure environment, the boiling point of the material significantly decreases. The jacket heating vaporizes water or solvents, and the steam is recovered by the condenser. The dry material gradually loosens and dries under slow stirring by the rake teeth, forming uniform powder or particles.

3、 Product advantages and technical features

1. Low temperature and efficient drying
   Under vacuum conditions, materials can be dried at 40-80 ℃, which is more energy-efficient than atmospheric drying and effectively protects active ingredients from damage.

2. No lumps
   The rake teeth continue to flip, breaking the surface hard shell and solving the problem of high viscosity materials being "dry on the outside and wet on the inside". The drying uniformity far exceeds that of a static vacuum drying oven.

3. Solvent is recyclable, environmentally friendly and economical
   Configure tube or coil condensers to reduce raw material costs and environmental treatment pressure.

4. Fully enclosed operation, safe and clean

   • The whole machine has no leakage points and is suitable for toxic, odorous or highly allergenic materials;
   • Can be filled with nitrogen for protection, preventing oxidation and deterioration;
   • Quick disassembly structure design, easy cleaning and maintenance, in compliance with laboratory standards.

5. Compact structure and small footprint
   Compact design, can be placed next to fume hoods or clean laboratory tables, without the need for dedicated workshops.

6. Easy to operate, controllable parameters
   The temperature, vacuum degree, and time are independently set, and the drying endpoint can be determined by experience or automatically determined by selecting an online moisture sensor.

4、 Equipment Display