Glossary
Hoppers and silos
Bin vibrator
Also known as pneumatic vibrator, electric vibrator, silo vibrator.
A bin vibrator is a pneumatic or electric vibrator mounted on the outside of a hopper, silo or bin to dislodge bulk-solids bridges by transmitting vibration through the vessel wall into the material inside. Bin vibrators are compact, inexpensive and the dominant flow aid on small storage vessels.
Types
- Pneumatic ball or turbine vibrators — compressed-air driven; ATEX-compatible variants available
- Electric rotary vibrators — eccentric-mass motors; higher continuous force; require ATEX rating for combustible-dust service
- Linear vibrators — for specific directional excitation
Limitations
- Material compaction risk — sustained vibration can densify wet or cohesive powders into a harder bridge, making the problem worse
- Vessel fatigue — vibration transmits into the vessel structure; long-term stress concentrations at welds
- Localised effect — vibrator energy diminishes rapidly with distance from the mounting point
- Noise exposure — pneumatic vibrators are loud
Vibrator vs sonic horn
| Attribute | Bin vibrator | Sonic horn |
|---|---|---|
| Contact with vessel | Direct (bolted) | None |
| Effect on material | Vibrates / can compact | Vibrates without compaction |
| Vessel fatigue | Yes | No |
| Coverage from one unit | Local to mounting | Whole-vessel acoustic field |
| Best suited to | Small bins, dry granular | Most powders, retrofit-friendly |
Related terms
Related terms
- Anti-bridging deviceAn anti-bridging device is any flow-aid hardware installed to prevent or break material bridging in a hopper or silo: sonic horns, air cannons, vibrators, fluidisation pads.
- HopperA hopper is an inverted-pyramid or conical vessel for storing and discharging bulk solids. Bridging and rat-holing are the universal failure modes; sonic horns are a clean, low-maintenance remedy.
- SiloA silo is a large vertical bulk-solids storage vessel. Cement, fly-ash, lime, biomass, fertilizer and food-powder silos all bridge and rat-hole; sonic horns are the leading flow aid.
- Air cannonAn air cannon is a pressure-vessel and quick-release-valve assembly that fires a brief high-pressure air pulse into a hopper or silo to break material bridges. Effective but causes structural stress.
- Sonic hornA sonic horn is a pneumatically-driven low-frequency sound emitter (typically 60–400 Hz at 140–180 dB SPL) used to dislodge particulate fouling from boilers, ESPs, baghouses and process vessels.