GZP Series Rake Vacuum Dryer -- Dryer -- Vacuum Drying -- Vacuum Dryer

The rake-type vacuum dryer produced by our company is an enhanced and improved design based on domestic rake-type vacuum dryer technology, suitable for various materials such as slurry, paste, granules, powder, and fibers. The transmission part adopts a stable and durable cylindrical gear reducer. The main shaft is made of thickened solid stainless steel, and the rake teeth are made of high-strength cast stainless steel, ensuring stable operation of the rake-type vacuum dryer in various harsh working environments. Two or four knocking rods can be added inside the shell to facilitate rapid drying and crushing of materials. Heating media options include steam, thermal oil, and hot water.

Application Range
Especially suitable for drying heat-sensitive materials, materials prone to oxidation at high temperatures, materials that tend to agglomerate during drying, and materials whose evaporated steam needs to be recovered. After drying, the material becomes powdery, making it suitable for products that are intended to be in powder form. The dried material can be directly packaged without further crushing. The feed moisture content for the rake-type vacuum dryer can be up to 90%, and the materials to be dried include slurry, paste, granules, powder, or fibers. The moisture content after drying can reach 1%, or even 0.5%. This vacuum dryer is widely used in the production process of solid sodium (potassium) alkoxide.

Features:
Strong applicability and fast drying speed. Since the rake dryer uses a jacket for heating and high-vacuum exhaust, it is suitable for almost all materials of different properties and states, especially for explosive and oxidation-prone materials.
High product quality. During the drying process, the rake teeth continuously rotate forward and backward, ensuring uniform stirring of the material.
Low steam consumption.
Easy to operate, capable of recovering volatile gases, reducing environmental pollution.

Main Technical Parameters

Ordering Information

When placing an order or inquiring, please specify:
1. Inner tank material (generally SUS304)
2. Jacket heating method (steam, hot water, thermal oil)
3. If using steam heating, specify the maximum steam pressure
4. Maximum jacket heating temperature
5. Whether the material is highly viscous
6. Whether an explosion-proof motor is required
7. Whether the control cabinet (for automatic timed forward and reverse rotation of rake teeth) needs to be explosion-proof

Since heating temperature, evaporation rate, condensation conditions, and other parameters vary across industries and drying processes, if you need us to select a vacuum pump and condenser for you, please provide:
1. Name of the medium to be evacuated (e.g., water or other organic solvents)
2. Average heating temperature of the dryer jacket (e.g., 110°C)
3. Working pressure (e.g., -0.08 MPa)
4. Maximum evaporation rate (e.g., 30 kg/h)
5. Cooling conditions in the operating environment (cooling water temperature and flow rate available from the user)

If none of the above drying process parameters can be provided and there is no similar successful experience, we recommend conducting a rake-type vacuum dryer test at our company.
Note: 1. Our test machine is the ZGP-100 model, which can dry 50 L of product per batch. We recommend testing 30–50 L of material per batch.
2. The test machine includes a thermal oil heating system and a vacuum pump.
3. Drying tests incur a certain fee.
4. If you need to conduct a drying test at our company, please notify us at least 2 days in advance to allow us to arrange the test.

Working Principle
The rake-type vacuum dryer utilizes the characteristic that the boiling point of water in materials is reduced under vacuum conditions for drying. The equipment uses steam jacket indirect heating, where water evaporates upon heating and is promptly removed. Inside the dryer shell, the rake teeth are driven by a transmission shaft. The rake teeth are designed at a certain angle to the axis. The main shaft rotates forward and backward, causing the material to move axially, facilitating drying and discharge.

Structural Features:
Solid all-stainless-steel main shaft design. Unlike hollow thick-walled tube designs, the material's state changes complexly during drying, often becoming viscous. The solid shaft's excellent rigidity ensures stable drying.
The cylinder is made of thick steel plates, with a normal jacket design pressure of 0.5 MPa. Custom orders are available for different requirements.
Cast stainless steel rake teeth. Many manufacturers design rake teeth as welded hollow tubes, which are prone to bending and breaking during drying, especially when knocking rods are added inside the dryer. Hollow tube rake teeth have a high failure rate, often bending or breaking. Knocking rods are free-moving hollow thick-walled stainless steel tubes of the same length as the shell. Typically, 2 or 4 knocking rods are added inside the shell, continuously striking the material to crush it and accelerate drying, resulting in better product quality. The high strength and stability of cast stainless steel rake teeth ensure extremely stable operation even with knocking rods, as proven in practice.
User-friendly feed and discharge design. The feed port features a quick-release flange for fast and convenient loading. The discharge port uses a worm gear enclosed discharge structure, making discharge easy and operation simple. The bottom of the discharge port retains no material, facilitating bagging during discharge.
Improved shaft end sealing minimizes leakage. This sealing type has been well validated in production processes requiring high sealing, such as solid sodium methoxide.

Schematic Diagram of Worm Gear Discharge Structure (Note: This discharge structure is generally used for ZGP-1000 and larger rake-type vacuum dryers. Smaller dryers typically use a quick-release discharge structure.) 

1. Discharge Body Shell　　　　2. Worm Shaft　　　　3. Front Worm Bearing Seat　　　
4. Handwheel　　　　　　　5. Worm　　　　　6. Sealing Gasket
7. Sealing Gasket Top Plate　　　　8. Sealing Gasket Bottom Plate　　　　9. Rocker Arm　　　
10. Worm Gear Shaft　　　　　 11. Worm Gear　　　　12. Observation Window Cover
13. Rear Worm Bearing Seat

Main Installation Dimensions Diagram 

Note: The above installation dimensions are for reference only. Actual dimensions are subject to the pre-order specifications and the physical product.