A shaft-less screw conveyor is a specialized material handling equipment that adopts a design without a central shaft, utilizing a flexible integral steel screw to push materials. This design gives the shaftless screw conveyor distinct advantages when handling (ribbon-like), stringy, or entangled materials, while simultaneously avoiding issues of material adherence or clogging on the screw body.
Main Components
The shaftless screw conveyor primarily consists of a drive unit, head assembly, housing, shaftless screw body, trough liner, inlet, outlet, cover (if required), and base. Among these, the drive unit provides power; the head assembly contains thrust bearings to withstand the axial force generated during conveying; the housing features a U-shaped or O-shaped structure made from materials like stainless steel, carbon steel, or FRP (fiberglass reinforced plastic). The shaftless screw body is the key component for material conveyance and is also made of stainless or carbon steel.
Working Principle
The working principle of the shaftless screw conveyor involves an electric motor driving the rotation of the spiral blade. The material is pushed along the inclined direction by the spiral blade and is then discharged from the outlet. During conveyance, the thrust from the screw propels the material forward, forming a continuous material flow.
Main Advantages
1. Superior Anti-Clogging Performance: The absence of a central shaft prevents materials from easily adhering to or clogging the screw body, reducing maintenance costs and failure rates.
2. Compact Structure: The design is simple and compact, saving space and allowing for smooth material transport in confined areas.
3. Good Environmental Performance: Fully enclosed conveying combined with an easy-to-clean screw surface ensures environmental hygiene, prevents contamination of the conveyed material, and eliminates leakage.
4. High Conveying Capacity: The conveying capacity is 1.5 times that of a traditional shafted screw conveyor of the same diameter.
5. Long Conveying Distance: A single unit can achieve a conveying length of up to 60 meters. Multi-stage (series-connected) installation can be implemented based on user needs for ultra-long-distance material transport.
6. Easy Operation: The shaftless screw conveyor is compact and simple to operate, reducing operational difficulty and labor costs.
Functional Features
Application Scenarios
Shaftless screw conveyors are widely used across multiple industries, including but not limited to:
Conveying and feeding of bulk materials such as cement, lime, gypsum, and fly ash.
Transporting and processing granular materials like grains, oilseeds, feed, fertilizer, and salt.
Handling and processing ores, coal, mineral powder, and mineral processing waste.
Conveying and processing powdered or granular substances including chemical products, plastics, rubber, pharmaceuticals, and food items.
Treatment of solid waste such as municipal waste, sludge, and slag.
Common Issues
The screw conveyor is a device that utilizes the rotation of a screw shaft to push materials for conveyance. It features a simple structure, reliable operation, and is easy to operate and maintain. Below are common issues and solutions related to screw conveyors.
Operating Instructions
The operating procedures for the screw conveyor include multiple aspects such as pre-startup preparations, startup operation, operation and maintenance during runtime, shutdown procedures, and precautions.
Precautions
1. The conveying distance of vertical screw conveyors is limited, typically not exceeding 10 meters (some sources indicate a maximum of 40 meters, but conveying efficiency and capacity decrease beyond this range).
2. Vertical screw conveyors are generally used to convey materials like flour, powdered materials, and small granules. This is because when materials move upward, their own gravity and the centrifugal force from the equipment cause collisions. If the material's gravity is too significant, it will affect conveying efficiency.
3. The spiral blades collide with the material during operation, which can cause breakage of fragile materials. Therefore, they are not suitable for conveying easily breakable materials.
4. Vertical screw conveyors rely on the friction between the material and the inner wall of the casing to lift and convey the material. The spiral blades, pipe wall, and material are in full contact, leading to relatively rapid wear and increased maintenance costs.
Case
Functional Features
Application Scenarios
As crucial equipment for material handling, screw conveyors have a wide range of application scenarios. Below are some common ones:
1. Building Materials Industry:
- Horizontal or inclined conveying of powdered and small lump materials like cement, sand, and lime.
- In concrete batching plants, used to convey aggregates (e.g., gravel, sand) and powders (e.g., cement, fly ash) to mixing equipment.
2. Chemical Industry:
- Conveying various powdered and granular raw materials, such as chemical fertilizers, plastic pellets, pigments, dyes, and catalysts.
- Used for transferring materials from one process step to another during the production, storage, and transportation of chemicals.
3. Grain and Food Industry:
- Used for conveying grains during storage, processing, and transportation, e.g., wheat, corn, rice, soybeans.
- In grain processing plants, transporting grain from silos to processing equipment or from processing equipment to packaging equipment.
- Conveying, mixing, stirring, and handling materials like flour, sugar, salt, and food additives in food processing and packaging.
4. Environmental Protection Industry:
- Conveying environmental materials such as sludge, wastewater, and municipal solid waste.
- In wastewater treatment plants, used to transfer sludge from sedimentation tanks to dewatering equipment; in waste transfer stations, moving waste from collection points to processing equipment.
5. Metallurgical Industry:
- Conveying metallurgical materials like slag, coke, and iron powder.
- In steel smelting processes, transporting raw materials from storage yards to smelting equipment, or moving processed materials to storage or treatment facilities.
6. Pharmaceutical Industry:
- Conveying pharmaceutical materials like powder, pills, and capsules.
- During drug production, transferring raw materials from warehouses to production equipment, or moving finished products to packaging or storage areas.
7. Energy Industry:
- Conveying energy materials like coal, pulverized coal, and ash/slag.
- In thermal power plants, used to transport coal from stockyards to boilers, or to convey ash and slag from boilers to disposal equipment.
Common Issues
The screw conveyor is a device that utilizes the rotation of a screw shaft to push materials for conveyance. It features a simple structure, reliable operation, and is easy to operate and maintain. Below are common issues and solutions related to screw conveyors.
Operating Instructions
The operating procedures for the screw conveyor include multiple aspects such as pre-startup preparations, startup operation, operation and maintenance during runtime, shutdown procedures, and precautions.
Case
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