Shaftless Screw Conveyor

A shaftless screw conveyor is a specialized continuous conveying equipment designed for transporting viscous,sticky,easily winding,or bulky materials that are difficult to handle with traditional shafted screw conveyors.Unlike conventional screw conveyors with a central shaft,it adopts a shaftless spiral blade structure,which eliminates the problem of material winding around the shaft and ensures smooth and efficient conveying.It is widely used in environmental protection,municipal engineering,chemical,food,pharmaceutical,and mining industries,especially suitable for sludge,pulp,garbage,sticky powder,and other special materials.

The core components of a shaftless screw conveyor mainly include a U-shaped trough(or tubular casing),shaftless spiral blade,drive unit,end bearing support,feeding hopper,discharging port,and optional cover plate.The U-shaped trough,usually made of carbon steel,304/316L stainless steel,or wear-resistant alloy plate,provides a stable conveying channel with a smooth inner wall to reduce material friction.The shaftless spiral blade,the key working part,is a continuous integral structure without a central shaft,made of high-strength wear-resistant material to withstand the impact and friction of viscous materials.The drive unit consists of a motor,reducer,and coupling,providing stable power output,and the conveying speed can be adjusted according to material characteristics and production needs.The end bearing support ensures the stable rotation of the spiral blade,while the optional cover plate can effectively prevent odor diffusion and material splashing.

The working principle of the shaftless screw conveyor is practical and reliable.When the drive unit is started,the shaftless spiral blade rotates at a constant speed.Materials are fed into the U-shaped trough through the feeding hopper,and under the thrust generated by the rotating spiral blade,the materials move forward along the trough continuously.Since there is no central shaft,materials will not wind around the shaft,avoiding blockages and ensuring continuous conveying.It supports horizontal,inclined,and vertical installation modes,with an inclined angle generally up to 30°,and can realize one-way or two-way conveying according to production requirements.The integral spiral blade design also makes it easy to clean and maintain,reducing the risk of material residue.

Compared with traditional shafted screw conveyors,the shaftless screw conveyor has unique advantages.Firstly,it solves the problem of material winding,which is particularly suitable for viscous,fibrous,or bulky materials such as sludge,kitchen waste,and pulp.Secondly,it has a simple structure,no central shaft,small footprint,and can be installed in narrow spaces.Thirdly,it has strong adaptability,can convey materials with high moisture content and viscosity,and the spiral blade is wear-resistant and corrosion-resistant,extending the service life.In addition,it operates stably,has low noise,low energy consumption,and easy maintenance,reducing the long-term operation cost for enterprises.It also avoids material accumulation and blockage,improving production efficiency.

Typical customizable specifications include:trough material(carbon steel,304/316L stainless steel),trough width(150-1000mm),conveying length(1-40m),conveying capacity(0.5-100 m³/h),and spiral speed(10-80 r/min).It is widely used in sludge treatment,garbage disposal,food processing,chemical raw material conveying,and other fields.As a specialized conveying equipment for difficult-to-handle materials,the shaftless screw conveyor provides a reliable and efficient solution for industrial material handling,effectively solving the pain points of traditional conveyors in handling special materials.