waste recycling & classifying trommel screen

Deya machinery got an order from Bolivia for waste recycling and classifying by trommel screen, the process diagram as showed on the picture. Trommel has became one of the most important product in Deya machinery factory, deya produces the most durable and efficient trommel screen, it is widely used in solid materials classifying, waste recycling, compost screening, alluvial gold washing, etc.
waste classifying tommel screen

waste classifying trommel

waste trommel by deya

Trommel Screen

A trommel is a slightly inclined rotating cylindrical screen. The material is fed at one end of the cylinder and the undersize material falls through the screening surface while the oversize is conveyed by the rotating motion down the incline to the discharge end. Although trommels are relatively cheap, they have lower capacities and are susceptible to rapid wear; hence they have been largely replaced by vibrating or shaking screens. A trommel can handle both dry and wet feed material.

Trommel screen introduction

One of the oldest screening devices is the trommel or revolving screen, which is a cylindrical screen typically rotating at between 35 and 45% critical speed. Trommels are installed on a small angle to the horizontal or use a series of internal baffles to transport material along the cylinder. Trommels can be made to deliver several sized products by using trommel screens in series from finest to coarsest such as the one shown; or using concentric trommels with the coarsest mesh being innermost. Trommels can handle material from55 mmdown to6 mm, and even smaller sizes can be handled under wet screening conditions. Although trommels are cheaper, vibration-free, and mechanically robust; they typically have lower capacities than vibrating screens since only part of the screen surface is in use at any one time, and they can be more prone to blinding.

Trommel Screen

Trommel screen working principle:
Materials are sent to the trommel screen drum and lifted up by the rotation and aerated as they fall back down. This action is repeated with each rotation along the length of the drum. The smaller material passes through the screen mesh while the larger material moves towards its exit at the rear of the drum. The trommel screen can be produce with one single screen mesh, two meshes, or three meshes according to the needs. There is cover outside to protect the equipment from dust.