Screw Conveyor Blades

What are screw conveyor blades?

Screw conveyor blades, also known as flighting, are the helical-shaped components that are attached to the central shaft of a screw conveyor. These blades play a crucial role in the operation of the screw conveyor, as they are responsible for moving and conveying materials along the length of the conveyor.

Types of screw conveyor blades

Screw conveyor blades are mainly divided into shaft screw conveyor blades and shaftless screw conveyor blades. The following is a detailed introduction to these two blades:

Shaft screw conveyor blades

Structure: Shaft screw conveyor blades are spiral blades rotating around the central axis, and the central axis provides support and power transmission.

Material: Usually made of carbon steel, stainless steel or wear-resistant materials to adapt to different materials and working environments.

Shape: Mostly continuous spiral shapes, but also in the form of strips, sheets, etc.

Advantages: The central axis provides additional rigidity and strength, suitable for long-distance and large-tonnage material transportation. The blades are not easy to deform during the conveying process, ensuring stable material transportation. It can be used to convey powdered, granular and small block materials, suitable for various working conditions.

Application: Used for material transportation in cement, chemical, grain, metallurgy and other industries, such as cement powder, coal powder, grain, etc.

Shaftless screw conveyor blades

Structure: Shaftless screw conveyor blades have no central axis, and the blades are driven by their own rigidity and the support of the conveying trough.

Material: Usually made of high manganese steel, carbon steel and stainless steel to improve durability and corrosion resistance.

Shape: Often a thicker spiral shape to enhance self-supporting ability.

Advantages: No central shaft, which increases the conveying volume of the blades and is suitable for conveying viscous and entangled materials. The shaftless design reduces the difficulty of blockage and maintenance, and is easy to clean and maintain. The blades can be bent to a certain extent to adapt to complex conveying paths.

Application: Suitable for conveying materials that are easy to entangle and have high viscosity, such as sludge, garbage, waste, clay, etc., and is widely used in environmental protection, sewage treatment, garbage disposal and other fields.

How to choose screw conveyor blades?

The spiral blades of screw conveyors have three forms: solid spiral surface, belt spiral surface and blade spiral surface.

Solid spiral blade: Full blade blade is directly welded or riveted on the shaft, suitable for dry powder or small particle materials.

Ribbon-shaped spiral blade: fixed on the shaft with a radial rod between the blade and the shaft, suitable for block materials with a certain viscosity.

Paddle-type propeller blades: Paddle-type design can blend and stir materials.

Serrated spiral blade: It has serrated grooves and plays the role of cutting, loosening, stirring and other mixing functions.

When selecting screw conveyor blades, there are several key factors to consider:

Material characteristics: First of all, we must understand the characteristics of the transported materials, including particle size, density, fluidity, humidity, viscosity, etc. Different material properties may affect blade selection. For example, for sticky materials, cutting blades or ribbon blades may be more suitable, while for materials that tend to accumulate, short-pitch blades may be more suitable.

Load and conveying capacity: Determine the required conveying capacity and expected load. This will affect the choice of blade size, pitch and diameter. For high load and large conveying capacity applications, larger diameter and tighter pitch blades may be selected.

Working environment conditions: Consider the working environment conditions of the screw conveyor, including temperature, humidity, corrosiveness, etc. Select appropriate blade materials according to the working environment, such as stainless steel, wear-resistant alloys, etc., to ensure that the blades can withstand harsh conditions and have a long service life.

Design requirements: Consider special design requirements, such as applications that require stirring or mixing materials, which may require the selection of mixing blades. If you need to reduce material residue or facilitate cleaning, you can choose blades with special shapes or cutting designs.

Consult professional manufacturers: Communicate and consult with professional screw conveyor manufacturers or suppliers. They can provide professional suggestions and customized solutions according to your specific needs. They have extensive experience and knowledge and can help you choose the most suitable blade type and configuration.

Screw conveyor blade material:

Stainless steel material: not easy to rust, acid and alkali resistant, high temperature resistant, low temperature resistant, wear resistant, longer service life.

Carbon steel material: The screw conveyor blade has higher hardness and wear resistance, which can ensure its long-term use, but its thermal hardness will be poor, because when the working temperature is greater than 200°C, its hardness and The wear resistance will drop sharply.

Manganese steel material: high hardness, high strength, better wear resistance, suitable for conveying highly polished materials, but easy to rust.

Screw conveyor blade types:

Shafted screw conveyor blades: Shafted blades are a common type of screw conveyor blades. They can be used for material transportation in three ways: horizontal, inclined, and vertical. They can transport loose materials and powdery or granular materials, such as malt powder. , rubber powder, soybeans, rapeseed, etc.

Shaftless screw conveyor blade: Shaftless blade is simply a spiral blade without a central axis. Its transportation method is mainly horizontal and small-angle tilt. It is mainly used to transport materials that are easy to wind and have strong viscosity, such as domestic garbage, sewage, etc. Mud etc.

Benefits of screw conveyor blades

Screw conveyor blades have the following characteristics:

Spiral shape: The blades are spiral-shaped and rotate around the central axis to form a continuous spiral channel. This design effectively propels material along the length of the conveyor.

Various Shapes and Types: Screw conveyor blades can come in a variety of shapes and types depending on different application requirements. For example, standard pitch blades, short pitch blades, cutting blades, ribbon blades and mixing blades, etc. Different types of blades are suitable for different material characteristics and conveying requirements.

Material selection: Screw conveyor blades are usually made of materials with good wear resistance to ensure their durability and service life. Common blade materials include carbon steel, stainless steel and wear-resistant alloys. The choice of material depends on the characteristics of the conveyed material, such as abrasion, temperature and chemical properties.

Customizability: Screw conveyor blades can be customized to meet specific application needs. For example, the pitch, diameter and blade shape of the spiral can be adjusted to adapt to the conveying requirements of different materials.

Wear resistance and easy cleaning: Since the screw conveyor blades are in direct contact with the material during the material transportation process, they need to have good wear resistance. In addition, the easy-to-clean design can reduce material residue and reduce the difficulty of maintenance and cleaning.

Screw conveyor blade specifications

OD (mm)	94	94	120	120	125	125	140	160	200	440	500	500
ID (mm)	25	25	28	40	30	30	45	40	45	300	300	320
Pitch (mm)	72	100	120	120	100	125	120	160	160	400	460	400
Thickness (mm)	3.5	3.5	3.5	3.5	3.5	3.5	3.5	3.5	3.5	3.5	3.5	3.5
OD (mm)	160	160	200	200	250	250	320	320	400	400	500	500
ID (mm)	42	42	48	48	60	60	76	76	108	108	133	133
Pitch (mm)	120	160	160	200	200	250	250	320	320	400	400	500
Thickness (mm)	3.5	3.5	3.5	3.5	3.5	5	5	5	5	5	5	5
OD (mm)	140	140	190	190	240	240	290	290	290	290	370	370
ID (mm)	60	60	60	60	60	60	89	89	114	114	114	114
Pitch (mm)	112	150	133	200	166	250	200	290	200	300	300	380
Thickness (mm)	5	5	5	5	5	5	5	5	5	5	5	5
OD (mm)	60—3000					Material						Carbon Steel
ID (mm)	30—2500									Stainless Steel
Pitch (mm)	60—3000
Thickness (mm)	6.0—60.0											Wear Resistance Steel

Screw conveyor blade manufacturer

Xinxiang Dahan screw conveyor blade manufacturer has many years of experience and professional knowledge, and has accumulated rich experience in the design, manufacturing and application of screw conveyor blades. They understand the needs of different industries and can provide customized blade solutions. Ye Dahan Company currently supplies spiral blades with an outer diameter of up to 1250mm and a thickness of ≤60mm. Other specifications can be customized according to user requirements.