I. Equipment Overview

The rake dryer is a horizontal batch - type vacuum drying equipment designed specifically for heat - sensitive, easily oxidizable, and paste - like materials. Its core advantage lies in the low - temperature and airtight drying environment, which can effectively retain the active ingredients of the materials and avoid the risk of oxidation. The equipment uses a combined heating structure of a jacket and a stirring device, supporting heat transfer with various media such as steam, heat - conducting oil, or hot water. The material can be selected from stainless steel or carbon steel (Q235) to meet the corrosion - resistance and hygiene requirements of different industries.

 

II. Working Principle and Technological Breakthroughs

After the materials are added from the top of the drying chamber, the main shaft drives the double - helical ribbon rake teeth to rotate at a constant speed (7 - 8 revolutions per minute), causing the materials to continuously turn in the axial and radial directions. During the stirring process, the materials are in full contact with the heating jacket, the moisture evaporates due to heat, and is quickly discharged by the vacuum pump. The drying efficiency is more than 40% higher than that of traditional equipment. The technological innovation is reflected in three aspects:

1. Double - helical Ribbon Stirring System: The reverse design of the inner and outer spirals solves the problem of caking of fine - particle materials, increasing the material renewal rate by 60% and keeping the wall - sticking rate below 0.5%.

2. Gradient Temperature Control Technology: It can precisely adjust the jacket temperature (with an error of ±0.5°C) to prevent the denaturation of heat - sensitive components.

3. Intelligent Vacuum Management: The operating vacuum degree can reach - 0.098MPa, achieving low - temperature and high - efficiency dehydration by reducing the boiling point of the solvent.

 

III. Core Performance Advantages

• Energy Saving and Consumption Reduction: The double - heating channels (jacket + rake teeth) expand the heat - transfer area, reducing the steam consumption by 30% - 50%.

• Airtight and Explosion - proof: The leakage rate of the magnetic sealing system is < 0.1m³/h, and organic solvents such as ethanol and acetone can be recovered, with a recovery rate of over 95%.

• Broad - spectrum Adaptability: It can process slurry, powder, and fibrous materials with a water content of 15% - 90%, especially suitable for biological products that need to retain activity.

• Intelligent Control: The integrated PLC system can monitor parameters such as temperature and vacuum degree in real - time, realizing unattended drying.

 

IV. Industry Application Scenarios

1. Pharmaceutical Field: Drying heat - sensitive drugs such as antibiotics and enzyme preparations, with an active ingredient retention rate of > 99%.

2. New Energy Materials: For lithium - battery anode materials (such as silicon - based and graphite), the water content is ≤ 0.03% under a vacuum of - 0.095MPa, meeting the standards of power batteries.

3. Food Industry: Low - temperature drying of tea polyphenols and fruit and vegetable powders to avoid nutrient loss and color deterioration.

4. Fine Chemical Industry: Safe production of explosive materials such as dyes and catalysts, with a solvent recovery rate of up to 98%.

 

V. Selection and Usage Suggestions

• When processing viscous materials, it is advisable to choose a model with an ultrasonic vibration function to prevent coking on the inner wall.

• A nitrogen protection system should be configured for drying nanomaterials to avoid oxidation and agglomeration.

• Regularly check the effectiveness of the sealing components and the vacuum pump to ensure that the system leakage rate complies with GMP specifications.

 

Through the integration of structural innovation and intelligent control technology, the rake dryer has verified its reliability in more than 200 industrial scenarios. Its characteristics of low energy consumption and high safety are promoting the green manufacturing transformation of industries such as pharmaceuticals and new energy.