Description
Shaftless screw conveyors are designed for efficient material handling, featuring an Archimedean screw without an internal shaft. This screw is driven by a power transmission gear motor, enabling the spiral to rotate within a trough. Material is loaded through one or more hoppers and directed to one or more exhaust ports, which may be equipped with shut-off sliding valves.
These conveyors can be configured in two ways: a “pull” configuration, where the machine pulls material from the inlet towards the outlet with the drive positioned after the outlet spout, or a “push” configuration, where it pushes material towards the outlet with the drive located before the inlet.
The power transmission to the screw can be direct, involving the gearbox’s output shaft connected directly to the screw flange, or it can be a system comprising a motor drive system, chain, and flanged shaft connected to the screw.
Shaftless screw conveyors are particularly adept at transporting materials prone to clogging, such as sludge or screenings, which would typically adhere to a screw’s shaft. These conveyors generally operate most efficiently at angles ranging from 0° to 30°, with efficiency decreasing as the inclination increases.
Construction materials for these conveyors include a variety of options, such as stainless steel (grades 304 or 316) and high-strength carbon steel. For specific applications, alternative materials like AISI 904 or Duplex stainless steel can be provided.
Key advantages of the SA model Shaftless screw conveyors include:
- Simplicity in design and function.
- Extremely easy installation and maintenance.
In typical installation and operational scenarios, these conveyors require little to no maintenance for the first 2 or 3 years.
Applications for shaftless screw conveyors are diverse, including:
- Municipal wastewater treatment for sludge and screenings.
- Paper mills.
- The food industry.
- General industrial plants.
Maintenance, when necessary, is straightforward and can be performed on-site with minimal downtime for the machine.
Upon request, these units can be equipped with a control panel, available in either electromechanical or PLC-controlled formats, to meet various operational needs and preferences.