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Air Knocker
Indirect Impact Type
The Air knocker (Indirect impact type) is a unique equipment in which the force of compressed air causes the piston to energetically strike the base surface, which eliminates the adhesion or clogging of powder. In addition, this knocker is excellent in safety and economics because it can be used only by air supply, and it can be used safely for powder that has a characteristic to show adhesion when receiving the centrifugal vibration.
Typical Applications
- Sewage sludge fuel production facilities
- Dust hopper in waste treatment plants
- Recycle fuel (Compressed wood) supply hoppers
- Glass cullet storage hoppers
- Animal feed silos
- Ejection of silica gel
- Calcination of raw materials on walls
- Ash in recycle plants and ejection of aluminum powder
- Piping in process area
Left : Welded on hopper
Right : Welded on U-bolt attachment
RKV20PA
RKV30/40PA
RKV60/80/100PA
The impact force of the air knocker can be
easily adjusted via unique valve mechanism (patented) by varying the compressed air supply.
The ability to adjust the impact force will enhances the air knocker capability to work on unforeseen circumstances such as changes of material characteristic due to the process.
*The blue part is the unique “umbrella type valve”
Beside working as a standalone unit, the air knocker also has a relay piping feature (patented) which can link multiple air knockers in cascade connection and operate with an air knocker’s controller or a solenoid valve. This feature is extremely useful where several air knockers installed on a same silo/hopper or on the same pipe line and it could significantly reduce the control component costs.
Multiple Air Knockers operated in Cascade Connection
The body of Exen’s RKV air knocker is made of high strength ductile cast iron FCD 800 which could lasts for years.
| Model | Working Pressure (Mpa) | Stroke Cycle (times/min) | Air Consumption (L/time (ANR)) | Stroke Energy (N.m) | Impulsive Force (kg.m/s) | Equivalent Hammer (pound) | Mass (kg) |
|---|---|---|---|---|---|---|---|
| RKV20PA | 0.3 ~ 0.7 | 1 ~ 60 | 0.04 ~ 0.10 | 4.3 ~ 8.3 | 0.6 ~ 0.8 | 0.6 or less | 0.8 |
| RKV30PA | 0.05 ~ 0.13 | 5.5 ~ 13.1 | 1.2 ~ 1.8 | 1 or less | 1.4 | ||
| RKV40PA | 0.15 ~ 0.37 | 9.2 ~ 22.3 | 2.6 ~ 4.0 | 1 ~ 1.5 | 3.5 | ||
| RKV60PA | 0.33 ~ 0.77 | 20.6 ~ 49.0 | 6.9 ~ 10.6 | 1.5 ~ 3 | 9.3 | ||
| RKV80PA | 0.60 ~ 1.40 | 45.1 ~ 109 | 15.2 ~ 23.7 | 3 ~ 8 | 14.5 | ||
| RKV100PA | 0.98 ~ 2.28 | 82.4 ~ 201 | 30.0 ~ 46.9 | 6 ~ 15 | 34.0 | ||
| RKV120PA | 1~ 6 | 3.32 ~ 6.64 | 131 ~ 321 | 52.0 ~ 84.0 | Equivalent to 2x 100PA | 49.4 |
* The reinforcement rib is included in RKV60PA or upper models as standard, and wire and shackle are included in all models as standard.
* The weight includes that of base.
* RKV120P model is not equipped a fall prevention wire to the body. Please be sure to install them before using.
* Mounting base of RKV120P is including reinforcing ribs. Please weld this ribs to the mounting base when using.
* RKV120P mounting base is sold separately.
| Model | ØA | ØC | D | G | H | I | ØJ | ØK | L | M | ØN | O | Tubing Size |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| RKV20P | 57 | 57 | 6.5 | 1/8 | 70 | (26) | 6.5 | 44 | 6 | 28 | 21.7 | Rp1/8 | Ø6 X Ø4 |
| RKV30PA | 60 | 70 | 8 | 95 | (25) | 8.5 | 55 | 8 | 35 | 27.2 | Rp1/4 | Ø8X Ø6 | |
| RKV40PA | 86 | 95 | 12 | 140 | 12.5 | 70 | 13 | 60 | 34.0 |
| Model | ØA | ØC | D | G | H | I | ØJ | ØK | L | M | M’ | ØN | O | P | Tubing Size |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| RKV60PA | 115 | 138 | 14 | 1/4 | 183 | (28) | 14.5 | 110 | 15 | 80 | 120 | 76.3 | Rp3/8 | 196 | Ø8 X Ø6 |
| RKV80PA | 146 | 148 | 16 | 222 | 17.0 | 120 | 18 | 90 | 115 | Rp1/2 | 216 | ||||
| RKV100PA | 175 | 208 | 20 | 270 | 21.0 | 170 | 23 | 115 | 135 | 114.3 | Rp3/4 | 308 | |||
| RKV120PA | 220 | 235 | 21 | 326 | 17.5 | 198 | 100 | 120 | 133 | 2xRp3/4 | (313) |