GT Type Air Pneumatic Turbine Vibrator For Hopper Products Features Vibration intensity can be adjustable based on air pressure, can immediately start, stop, fast, low-noise, vibration force, security. Application Feed material conveyor, vibrating screening, vibrating hopper, to help fill packing, foundry sand mold vibration. Works Copper eccentric gear installed counterweight impact air intake charge into the gear rotates, the eccentric rotation of the centrifugal weight with vibration, the gear driven by a bearing, low noise.