Screw Feeder
What are the types of screw feeders?
Screw Feeder, also known as spiral feeder or screw feeder, is divided into types based on a variety of factors, including structural form, feeding accuracy, conveying method, etc., to adapt to different material characteristics and process requirements. The following are the main classification methods:Shafted Screw Feeder
Structure: A spiral blade with a central axis rotates in a U-shaped groove or tubular shell.
Features: Suitable for conveying powdery and granular materials with good fluidity, uniform particles and not easy to entangle, such as dry powders, small particles, etc. The center shaft provides stable support, suitable for precise volumetric feeding.
Shaftless Screw Feeder
Structure: There is no center shaft. The spiral blade is a thick, flexible spiral steel belt, which rotates in the U-shaped groove relying on its own strength and the groove liner support.
Features: It is particularly suitable for conveying materials with high viscosity, easy to entangle, and high moisture content, such as sludge, filter cake, kitchen waste, fibrous materials, etc. The shaftless design avoids material entanglement and blockage, and the material passing section is larger and not easy to block.
Tube type Screw Feeder Features: The spiral blade rotates in the round tube, and the tube body is fully enclosed. The sealing is excellent, which can effectively prevent dust leakage, material contamination and odor diffusion. It is suitable for dusty, toxic, and volatile materials, and is also often used for inclined or vertical feeding.
Basic parameters of Screw Feeder
| Model |
Diameter (mm) |
Pitch (mm) |
Rotating speed (r/min) |
Capacity (m³/h) |
Rotating speed (r/min) |
Capacity (m³/h) |
Rotating speed (r/min) |
Capacity (m³/h) |
Rotating speed (r/min) |
Capacity (m³/h) |
|
| Small | 100 | 100 | 100 | 140 | 2.2 | 112 | 1.7 | 90 | 1.4 | 71 | 1.1 |
| 125 | 125 | 125 | 125 | 3.8 | 100 | 3 | 80 | 2.4 | 63 | 1.9 | |
| 160 | 160 | 160 | 112 | 7.1 | 90 | 5.7 | 71 | 4.5 | 56 | 3.6 | |
| 200 | 200 | 200 | 100 | 12.4 | 80 | 9.9 | 63 | 7.8 | 50 | 6.2 | |
| Small | 250 | 250 | 250 | 90 | 21.8 | 71 | 17.2 | 56 | 13.6 | 45 | 10.9 |
| 315 | 315 | 315 | 80 | 38.8 | 63 | 30.5 | 50 | 24.2 | 40 | 13.4 | |
| 400 | 400 | 355 | 71 | 62.5 | 56 | 49.3 | 45 | 38.6 | 36 | 31.7 | |
| Large | 500 | 500 | 400 | 63 | 97.7 | 50 | 77.6 | 40 | 62 | 32 | 49.6 |
| 630 | 630 | 450 | 50 | 138.5 | 40 | 110.8 | 32 | 88.6 | 25 | 69.3 | |
| 800 | 800 | 500 | 40 | 198.5 | 32 | 158.8 | 25 | 124.1 | 20 | 99.3 | |
What are the advantages of Screw Feeder?
As an important material handling equipment, Screw Feeder has the following significant advantages compared with other feeding and conveying methods:Accurate and uniform feeding capacity: By accurately controlling the speed of the screw (especially through frequency conversion speed regulation), the material conveying amount can be accurately controlled and continuously and evenly supplied.
Wide adaptability: It can handle various forms of bulk materials, including powder, granular, and small block materials. For special materials such as poor fluidity, easy bridging, high viscosity, high moisture content, and easy winding (shaftless type), reliable feeding can be achieved by selecting the appropriate spiral blade type (such as variable pitch, conical, paddle type) or adopting a shaftless design.
Flexible conveying direction: It can achieve horizontal and inclined conveying, and even vertical lifting under certain specific designs to adapt to different process layouts and space restrictions.
Compact structure and small footprint: Compared with belt feeders or vibrating feeders, Screw Feeders usually have a smaller cross-sectional area and a more compact overall structure. This makes them more flexible in installation and layout within limited production space.
Material mixing and stirring function (some types): Some specially designed spiral blades (such as paddle blades and segmented blades) can not only convey materials, but also play a certain role in stirring, mixing or breaking up lumps, thus achieving multiple uses of one machine.
What are the applications of Screw Feeder?
Screw Feeder is widely used in multiple industries and material handling scenarios because of its ability to achieve precise, uniform and continuous feeding.Accurate metering and proportioning of materials: Screw Feeder can stably convey powdered and granular materials to the next link according to the preset amount or speed. This is especially important in scenarios where multiple materials need to be mixed in a specific proportion, ensuring the accuracy of the formula.
Stable feeding of continuous production lines: In automated production lines that require continuous and uninterrupted material flow, Screw Feeder can continuously feed materials from silos or hoppers to subsequent processing equipment, such as reactors, mixers, packaging machines, etc., to ensure the smooth operation of the entire production process.
Handling special materials: For some materials with poor fluidity, easy bridging, high viscosity, high moisture content or easy entanglement, Screw Feeder can also effectively handle them by selecting appropriate spiral blade design (such as shaftless, variable pitch or paddle type) and trough structure to avoid blockage and jamming.
Control environmental pollution: Most Screw Feeders adopt a fully enclosed design, which can effectively prevent dust flying, odor diffusion and material leakage generated during the material transportation process, which helps to improve the working environment and reduce the impact on the surrounding environment.
Transfer and lifting of materials: In addition to precise feeding, Screw Feeder can also undertake horizontal and inclined material transportation tasks. Under certain special designs, it can even achieve vertical lifting, transporting materials from low positions to high positions, adapting to different factory layouts and space restrictions.
