LSY-type screw conveyor

The LSY-type screw conveyor is a continuous conveying device that transports powdered and granular materials within a closed, circular-cross-section casing by means of a rotating helical screw. Key features of the screw conveyor include a large inclination angle, high conveying capacity, and excellent dust- and moisture-proof performance. To enhance conveying capacity, the screw blades are designed with a variable pitch: the feed section at the lower end has a smaller pitch than the conveying section, allowing for greater material fill in the feed zone; as the pitch increases along the conveying section, the fill level decreases, thereby preventing backflow of highly flowable powdery materials during transport. The screw conveyor is assembled from multiple sections, each with a standard length of 3 meters, which facilitates transportation. In addition, the conveyor’s drive motor can be configured as a high-temperature-resistant type to withstand on-site construction conditions and ensure reliable operation in hot, dry environments.

The screw conveyor mainly consists of a geared reduction motor, a lower conveying pipe body, a lower screw blade shaft, intermediate suspension bearings, and an upper conveying pipe body. It is composed of components such as the upper helical blade shaft, the intermediate conveying pipe body, the intermediate helical blade shaft, the tail-end flange, and the lubrication assembly.

1. Lower conveying pipe body

The lower conveying pipe body mainly consists of a connecting flange, an inspection port, and a universal feed inlet. It consists of a mouth, lifting lugs, and a conveying pipe body. The universal feed inlet enhances the flexibility of process layout, while the lifting lugs facilitate the loading and unloading of the pipe body.

2. Lower helical blade shaft

The helical blade shaft mainly consists of a splined sleeve, small-pitch blades, large-pitch blades, and a central shaft. The splined sleeve is an involute internal spline. The key features include vibration resistance and automatic centering, as well as a retaining ring that effectively prevents shaft misalignment. The variable-pitch blade design effectively inhibits backflow of highly flowable powdered materials. The central shaft is made from high-quality seamless steel tubing and, after preliminary treatment and straightening, is machined at both ends to ensure optimal rigidity, straightness, and coaxiality of the screw shaft.

3. Intermediate Hanger Bearing

The intermediate hanger bearing is a cast aluminum alloy hanger, the intermediate hanger bearing. The grease-lubricated design ensures long service life and minimal axial cross-section, effectively preventing material blockage, facilitating maintenance, significantly enhancing overall conveying efficiency, and reducing maintenance time. The involute spline shaft design provides excellent alignment.

4. Install the upper conveying pipe

The upper conveying pipe body mainly consists of a connecting flange, an inspection port, and a discharge outlet, The assembly comprises lifting lugs, a conveying pipe body, and other components. The discharge outlet angle is customized according to customer requirements. The inclusion of lifting lugs facilitates the loading and unloading of the pipe body, while the provision of maintenance access ports significantly enhances maintenance efficiency. Additionally, the conveying pipe body is equipped with through-holes for securing the intermediate support bearings.

5. Upper helical blade shaft

The upper helical blade shaft mainly consists of a splined sleeve, large-pitch blades, and a reverse The assembly comprises blades, a central shaft, and other components. The spline sleeve features an involute internal spline, providing vibration damping and automatic centering; it is also equipped with retaining rings to effectively prevent axial displacement. The blades are manufactured via one-step extrusion molding to form continuous blades, while the central shaft is made from high-quality seamless steel tubing and, after preliminary treatment and straightening, is machined at both ends, thereby ensuring the helical shaft’s rigidity, straightness, and coaxiality.

6. Intermediate Conveying Pipe Body

The intermediate conveying pipe assembly primarily consists of connecting flanges, inspection ports, lifting lugs, and the conveying pipe body itself; the presence of the lifting lugs facilitates the handling of the pipe body. The presence of unloading and maintenance access ports significantly enhances maintenance efficiency, and the conveying pipe is equipped with through-holes for securing the intermediate suspension bearings.

7. Intermediate Helical Blade Shaft

The central helical blade shaft consists of a splined sleeve, large-pitch blades, and a core. The assembly comprises a shaft and other components; the spline sleeve features an involute internal spline, providing vibration damping and automatic centering, and is equipped with a retaining ring to effectively prevent shaft misalignment. The impeller blades are manufactured via one-step extrusion molding, while the central shaft is made from high-quality seamless steel tubing and, after preliminary treatment and straightening, is machined at both ends to ensure optimal rigidity, straightness, and coaxiality of the helical shaft.

8. End Flange

The tail-end flange mainly consists of an end flange, a cover, a splined shaft, bearings, and oil. The assembly comprises seals, retaining rings, and other components; the splined shaft features involute splines, providing vibration damping and automatic centering, while also enabling quick installation and easy maintenance. Deep-groove ball bearings are particularly well suited for longer inclined shafts.