Hopper discharge feeders are special discharge channels for a wide range of bulk materials from hoppers and silos.
A JOEST magnetic drive, designed as a sub-resonant dual-mass system, is attached to a channel-shaped machine body which it excites via a linear oscillating movement, which in turn conveys the bulk material by means of micro throw movements and discharges it from the hopper. In this design, the discharge rate can be widely varied, since the amplitude of the magnetic drive is adjustable via the built-in thyristor. Furthermore, the conveyor stops immediately when switched off without running on. Magnetic feeders are therefore especially useful for dosing (weighed feeding).
Various parameters have to be considered in the system’s design and configuration, such as hopper pressure, hopper geometry, particle size, flowability, humidity, tendency to caking, etc. Hopper discharge feeders are therefore designed individually for each application.
Wear plates
Covers
Hopper discharge chute
Layer thickness slider
Under-trough heating
Needle Gate
Supporting Structure
Transfer Hood
Dimensions and design features are tailored to the customer's specific requirements
High dosing precision is achievable
Not susceptible to blockages
Existing bridges in the bunker are eventually dissolved by vibration
Discharge mass flow is largely independent of the hopper filling level
Very good adjustability and control of the mass flow via thyristor control
