The LSS shaftless screw conveyor uses a continuous shaftless screw to move material. It complements shafted screw conveyors and belt conveyors when handling ribbon-like, tangling, or viscous materials, and replaces them in some duties. Its main advantages are anti-tangling performance, good sealing, and relatively simple structure. The screw itself is a shaftless spiral, which is more difficult to manufacture than a conventional shafted screw. Domestic production once relied on imports, but localized products are now available. When screw blades, wear liners, or U-trough components need replacement or machining from drawings, we can machine single parts or small batches to customer drawings. Hansheng Automation confirms material, tolerance, and surface treatment against the drawing.
Applications
The LSS shaftless screw conveyor mainly serves the chemical, food, pharmaceutical, paper, beverage, and environmental protection industries. It handles materials with strong adhesion, pasty and viscous materials, and materials that tend to tangle. Typical materials include chemical raw materials, waste paper pulp, malt, sludge, domestic waste, screen screenings, and dewatered cake. Shafted screw conveyors tend to wrap or clog with these materials, and belt conveyors handle viscous or ribbon-like materials poorly. The shaftless screw structure has an advantage in these duties.
Structural features
Strong anti-tangling performance. There is no center shaft for material to wrap around, so ribbon-like, viscous, and tangling materials pass through with less risk of blockage.
Good sealing and cleanability. A fully enclosed U-trough contains the material, and the screw surface is easy to clean. Material does not leak out or become contaminated from outside. The U-trough cover is removable for inspection and cleaning.
High torque and stable low-speed operation. Because the screw has no shaft, material does not clog easily in the trough, so the conveyor can run at lower speed with smooth transmission. A cycloidal pinwheel reducer is commonly used in the drive.
High conveying capacity. At the same screw diameter, capacity is about 1.5 times that of a conventional shafted screw conveyor.
Single-unit conveying length is limited by screw deflection. In normal horizontal arrangement, single-unit length is usually around 25 to 30 m. Beyond this range, a larger screw diameter, optimized drive position, or multi-stage series connection is needed. Series connection achieves a longer total conveying distance.
Replaceable liners at wear points. A wear liner is normally fitted between the U-trough bottom and the screw blades. Liner materials include HDPE, nylon, ultra-high molecular weight polyethylene, or MC nylon. The liner can be removed quickly, so the trough body does not need replacement when wear occurs. Screw blades are commonly made of 16Mn alloy steel or 304 stainless steel, with thick blade sections to resist friction from viscous materials.
Our precision parts custom machining capability is not limited to screw blades and wear liners for shaftless screw conveyors. We also machine yacht precision parts, RC racing car precision parts, filling machinery parts, tobacco packaging machinery parts, and non-standard parts for printing machinery, food machinery, and medical devices. Hansheng Automation confirms material, tolerance, and surface treatment against customer drawings and supports single part or small batch machining and delivery.
