The FlexMAX flexible screw conveyors use feed hoppers with 60-degree sides and FASTFLO rounded corners to promote the free flow of product. For the most difficult-to-feed bulk materials, Erie Technical Systems offers a rotary electric vibrator option. The rotary electric vibrator attaches to the standard mounting bracket supplied on all of our FlexMAX feed hoppers. The rotary electric vibrators are powered by an electric motor to rotate two sets of weights and provides a high force output to ensure product flow out of the hopper. A pneumatic version of the feed hopper vibrator is also available. Either unit can be automatically controlled by our Flexible Screw Conveyor Controller.