Pneumatic Concrete Vibrator
Also known as: Pneumatic vibrator poker, mining pneumatic immersion vibrator; powered by compressed air with no electric motor — intrinsically explosion-proof.
- Product Introduction
Also known as: Pneumatic vibrator poker, mining pneumatic immersion vibrator; powered by compressed air with no electric motor - intrinsically explosion-proof. Widely used for concrete compaction in underground coal mines, tunnels, and hazardous environments with flammable gas or coal dust.
Main models: FRZ‑35, FRZ‑50, FRZ‑70, ZNF‑50; operating air pressure: 0.4–0.6 MPa, connected directly to underground compressed air pipelines or air compressors.
Applications
Immersion vibrator for compacting concrete, expelling internal air bubbles, consolidating aggregates, and improving concrete strength and integrity.
1. Concrete pouring in underground coal mine roadways, chambers, and shaft linings; suitable for gas/coal dust environments where electric equipment is prohibited.
2. Tunnels, culverts, chemical plant explosion-proof sites, and job sites without power supply.
3. Compaction of stiff and plastic concrete mixes.
⚠️ Compared to electric vibrators: The pneumatic type requires no power cables and is intrinsically explosion-proof; however, a reliable compressed air source is essential for operation.
Structure
Pneumatic motor head (power end)
Vane-type air motor consisting of rotor, vanes, bearings, air inlet valve, and quick-connect coupling; compressed air drives the vanes to rotate and output torque.
Flexible shaft assembly
Steel wire flexible shaft + rubber protective hose, transmitting torque with bending capability; common hose lengths: 4m, 6m, 8m.
Vibrator poker head (immersing end)
Alloy steel casing containing an eccentric mass / eccentric rotor; high-speed rotation generates high-frequency centrifugal vibration, directly inserted into concrete for compaction.
Working Principle
Compressed air (0.4–0.6 MPa) enters the pneumatic motor, driving the motor rotor at high speed. Torque is transmitted through the flexible shaft to the eccentric mass inside the poker head. The rotating eccentric mass produces high-frequency centrifugal vibration. This vibration is transferred to the concrete, causing aggregate particles to rearrange and air bubbles to rise and escape, achieving compaction and densification of the concrete.
Vibration frequency: approximately 8,000–12,000 vibrations per minute; frequency can be adjusted by varying the inlet air pressure.
Common Specifications & Parameters
| Model | Poker Diameter | Working Air Pressure | Air Consumption | Hose Length | Application |
|---|---|---|---|---|---|
| HSFRZ‑35 | Φ35mm | 0.4–0.6 MPa | 1.2–1.4 m³/min | 4–6m | Dense rebar areas, thin-wall small sections |
| HSFRZ‑50 | Φ50mm | 0.4–0.6 MPa | 1.5–1.7 m³/min | 4–6–8m | General-purpose mainstream model for underground mines |
| HSFRZ‑70 | Φ70mm | 0.4–0.6 MPa | 1.8–2.0 m³/min | 4–6m | Large cross-section thick walls, mass concrete |
Advantages
Intrinsically explosion-proof - no electrical components, safe in underground gas/coal dust environments, no spark generation; unaffected by moisture with no risk of electric shock.
No power cables required - directly connects to compressed air lines for easy underground operation.
Overload does not cause burnout; vibration intensity can be adjusted by regulating air pressure.
Flexible shaft allows bending, suitable for congested rebar areas and narrow formwork spaces.
Usage Precautions
Maintain air pressure at 0.4–0.6 MPa. Too low pressure results in weak vibration; too high accelerates wear on vanes and the flexible shaft. It is recommended to install an air filter/water separator and an oil mist lubricator on the air supply line.
The flexible shaft must not be sharply kinked or bent at tight angles; avoid excessive bending to prevent fracture of the internal steel wire core.
The poker head must be immersed in concrete during operation. Do not run the vibrator idle for extended periods - prolonged idling causes overheating and damage to internal bearings.
Use a "quick insert, slow withdraw" technique; distribute insertion points evenly to avoid missed or over-vibration. Avoid striking rebar or formwork with the poker head.
Regular inspections: check for vane wear in the motor, broken wires in the flexible shaft, and cracks in the poker casing. Replace worn parts promptly.
Keep the exhaust outlet away from personnel to prevent dust blow-off and injury.
Pneumatic Vibrator vs. Electric Vibrator
| Item | Pneumatic Vibrator | Electric Immersion Vibrator |
|---|---|---|
| Power source | Compressed air | Mains electricity |
| Explosion-proof | Intrinsically explosion-proof, suitable for underground gas areas | Standard types are not explosion-proof; cannot be used underground |
| Infrastructure needed | Requires air pipeline / air compressor | Requires power supply cables |
| Wear parts | Air motor vanes, flexible shaft | Motor, cable, switch |
| Suitable environment | Underground coal mines, explosive atmospheres, wet/no-power sites | General surface construction sites |
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