Precautions for selection of shaftless screw conveyor

Precautions for selection of shaftless screw conveyor

Characteristics of conveying materials

1. Particle size: The size of material particles determines the spacing and diameter of spiral blades. Generally speaking, materials with larger particles require larger spiral diameters and wider blade spacing to prevent clogging. For example, when transporting block shaped ores, a shaftless screw conveyor with a diameter exceeding 300 millimeters and blade spacing exceeding 150 millimeters can be selected.

Humidity: Materials with high humidity are prone to sticking and clumping, which affects transportation efficiency. For high humidity materials, it is necessary to choose suitable spiral blade materials and surface treatments to reduce adhesion. For example, using stainless steel for polishing treatment and considering increasing the driving power of the spiral.

3. Viscosity: Viscous materials increase conveying resistance and require a large conveying torque. When selecting, the appropriate screw torque and speed should be chosen based on the viscosity of the material. For example, when transporting viscous materials such as sludge, a low speed and high torque shaftless screw conveyor should be selected.

4. Grinding: Grinding materials will wear down the spiral blades and conveyor housing. For such materials, high-performance materials such as high chromium cast iron or ceramic coated spiral blades should be selected.

The second is the requirement for conveying capacity

The appropriate conveying capacity needs to be determined based on actual production requirements. Generally speaking, the conveying capacity of a shaftless screw conveyor is between 1-50 cubic meters per hour. When selecting a model, the determined margin should be considered based on specific process requirements to cope with possible production fluctuations. For example, the design conveying capacity of a shaftless screw conveyor is 30 cubic meters per hour, which can be selected based on a conveying capacity of 35-40 cubic meters per hour.

Conveying distance and height three

1. Conveying distance: The conveying distance of a shaftless screw conveyor is generally within 20 meters, but it can also be designed to reach 30-50 meters. When the conveying distance is long, it may be necessary to increase intermediate support or use a height spiral shaft to consider the deflection and torque attenuation of the spiral.

2. Conveyor height: For conveyors that require an increase in height, the power and helix angle need to be calculated based on the height. The higher the height, the smaller the helix angle to reduce the possibility of material descent. If the lifting height is 5 meters, you can choose 30 spiral angles of ° -45 °.

Fourthly, the working environment

1. Temperature: In high-temperature environments, high-temperature resistant (based on actual reports) materials and lubrication methods should be selected, such as high-temperature resistant (based on actual reports) alloy steel spiral blades and high-temperature lubricating grease. In low-temperature environments, it may be necessary to insulate the equipment or use heating devices to consider material freezing and equipment start-up.

Corrosivity: If the working environment is corrosive, such as in chemical workshops or sewage treatment plants, corrosion-resistant materials such as shaftless screw conveyors made of stainless steel or plastic materials should be selected (based on actual reports).

3. Space layout: Select the appropriate conveyor model and layout based on the size and shape of the installation location space. If space is limited, compact or curved shaftless screw conveyors can be chosen.

Fifth, driving mode and power

1. Driving method: Direct connection of the motor and drive by the reducer are common driving methods. Direct connection of the motor is suitable for situations with short conveying distance and small conveying volume, and has the advantages of simple structure and low cost. The reducer drive is suitable for situations with long conveying distances and large conveying volumes, and can provide large torque and stable operation.

Power: Calculate the required driving power based on factors such as material characteristics, conveying capacity, conveying distance, and lifting height. Generally speaking, the driving power of a shaftless screw conveyor is between 0.75-15kW. When selecting, it is necessary to ensure that the power of the selected motor can meet the operating requirements of the equipment under full load and harsh working conditions.

Precautions for selection of shaftless screw conveyor