Whether you’re moving fine powders or excavated spoil, you’ll need a suitable conveying system. The type of system you need will obviously depend on what you’re moving and where, along with the expected throughput and downstream process. This is achieved by mechanical, pneumatic or vacuum means.
Conveyors: Solid and loose material can be conveyed horizontally or at an angle using a conveyor belt system. These can be used for a range of uses, including simple transfers and feeding devices. If materials are containerised, a roller system is used, while an inclined system using bucket elevation can take the place of pneumatic conveying when there’s insufficient space.
Screw and vibratory systems: Screw conveyors are a good choice for conveying bulk materials and also make an accurate feeding device. They’re also a savvy choice for conveying materials over longer distances. Vibratory systems can be used for horizontal and inclined conveying as well as being used for dispensing and feeding systems.
Dense phase systems: These systems convey materials at low speeds under high pressure using the batch conveyancing system. This minimises damage to delicate materials by using a high to low pressure system.
Lean or dilute phase: Used to convey materials continuously, this type of system uses high velocity but at low pressure to ensure material is conveyed from the discharge station using air and requires a filtration system to separate out the material from the air at the discharge point.
Unlike a lean or dilute phase system that blows the material from A to B, a vacuum conveyor, like those available from www.aptech.uk.com/pneumatic-conveying-systems/vacuum-conveying/, creates a vacuum which sucks the material through the system towards the receiving point.
A vacuum system uses a rotary valve or other feeding system to control the flow and a cyclone unit on the receiver to separate material and air. Another type of vacuum conveying system is a Venturi system. This uses fluid dynamics to create negative and positive pressures in the upstream and downstream respectively. The material is initially drawn into the conveying line by use of a pressure drop that creates a vacuum that sucks the dry material into the system.
Ultimately, you’ll need to take into account a wide range of factors, including available space, conveying distance and cost, when choosing the right conveying system for your materials.