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A screw conveyor, also known as an auger conveyor, is a type of conveying machine that moves materials by using a motor to produce spiral rotation. Screw conveyors are ideal for conveying particles or powdered materials in various industries. In this article, we will explore the terminology associated with screw conveyors, including definitions, working principles, types, uses, construction, and design considerations.
Understanding the different types of screw conveyors—such as horizontal,
Define Speed of Screw Conveyor
The speed of a screw conveyor refers to the rotational speed of the screw blade within the conveyor. It is typically measured in revolutions per minute (RPM) and plays a crucial role in determining the conveying capacity and efficiency of the system. The speed of the screw conveyor can be adjusted based on the material being conveyed and the desired throughput.
Screw Conveyor Definition
A screw conveyor is a mechanical conveying system that uses a rotating helical screw blade to move materials along a trough or tube. The screw blade creates a continuous flow of material by pushing it forward through the conveyor. Screw conveyors are commonly used in industries such as agriculture, food processing, mining, and construction for handling bulk materials efficiently.
Working Principle of Screw Conveyor
The working principle of a screw conveyor is based on the Archimedes' screw principle, which states that a rotating screw within a tube or trough can move materials along its length. As the screw rotates, it creates a continuous spiral flow that pushes the material forward. The inclined angle of the conveyor and the pitch of the screw blade determine the conveying capacity and efficiency of the system.
Types of Screw Conveyors
There are several types of screw conveyors commonly used in industrial applications:
1. **Horizontal Screw Conveyor**: This type of screw conveyor is used for horizontal conveying of materials.
2. **Inclined Screw Conveyor**: An inclined screw conveyor is used for conveying materials at an angle.
3. **Vertical Screw Conveyor**: Vertical screw conveyors are used for conveying materials vertically.
4. **Shaftless Screw Conveyor**: Shaftless screw conveyors are designed without a central shaft, allowing for the conveyance of sticky or viscous materials.
5. **Tubular Screw Conveyor**: Tubular screw conveyors are enclosed systems that prevent spillage and contamination of materials.
Each type of screw conveyor is designed to suit specific material handling requirements and operating conditions.
Screw Conveyor Uses
Screw conveyors are versatile machines that find applications in various industries for handling bulk materials. Some common uses of screw conveyors include:
- Transporting grains, powders, and granular materials in agriculture
- Mixing and blending ingredients in food processing
- Moving ores and minerals in mining operations
- Conveying cement, sand, and aggregates in construction
- Handling waste materials in recycling plants
The flexibility and efficiency of screw conveyors make them essential equipment in many industrial processes.
How to Make Screw Conveyor
The construction of a screw conveyor involves several key steps:
1. **Design**: Determine the material properties, flow rate, and operating conditions to design the screw conveyor.
2. **Fabrication**: Fabricate the trough or tube, screw blade, motor, and other components according to the design specifications.
3. **Assembly**: Assemble the screw conveyor by attaching the screw blade to the shaft and mounting it within the trough or tube.
4. **Testing**: Test the screw conveyor for proper operation, speed, and material handling capabilities.
5. **Installation**: Install the screw conveyor in the desired location and connect it to the material feed and discharge points.
Proper design, fabrication, and installation are essential for ensuring the efficient performance of a screw conveyor.
Parts of a Screw Conveyor
A screw conveyor consists of several main components:
1. **Screw Blade**: The helical blade that moves the material along the conveyor.
2. **Trough or Tube**: The housing that contains the screw blade and guides the material flow.
3. **Shaft**: The central shaft that connects to the motor and rotates the screw blade.
4. **Hanger Bearings**: Bearings that support the shaft and reduce friction during operation.
5. **Motor**: The power source that drives the rotation of the screw blade.
These components work together to facilitate the smooth and continuous movement of materials through the conveyor.
Design of Screw Conveyor
The design of a screw conveyor involves considerations such as:
- Material properties (e.g., particle size, density, flowability)
- Conveying capacity and speed requirements
- Trough or tube geometry and size
- Screw blade pitch and diameter
- Motor power and speed
- Operational conditions (e.g., temperature, moisture)
Knowing the basic terminology and the differences in each is a good first step to …
The vacuum tasks of a vacuum tank degasser, VD (VOD) and RH (RH-OB) are in some ways similar (Figure 1). The process time is typically 20 minutes, the process pressure is 0.5 Torr .
screw conveyor terminology|screw conveyor definition