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Pneumatic knocker K

Pneumatic knocker K

The effect of the knocker is comparable to that of the famous “silo hammer”, but without distorted silo spouts impeding the material flow.

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  • The world’s most powerful knocker!
  • Replaces the traditional silo hammer: always effective in cases where a hand hammer could be used.
  • Durable, robust and easy to maintain
  • Effective single impacts: maximum impact effect with minimum weight
  • Reliable removal in containers & silos of:
    • Product residues
    • Caking
    • Shaft formation
    • Bridging
  • Vibrates in a decaying manner: no vibration cracks
  • No imbalance as with vibrators
  • No self-resonance

This is because the knocker is only used when it is truly needed: maximum effectiveness with the greatest possible material protection! This relieves the strain on the weld seams, which would otherwise fatigue with constant vibration oscillations.

The knocker is normally controlled by an electrical control system with a solenoid valve.
Within the area where the knocking takes place there should be enough space for the impact to expand in all directions.

Reinforcements of the silo walls and additional ribs should be avoided, as this increases the weight and the strength of the silo walls and thus reduces the effect of the knocker.

The Pneumatic Knocker produces an ideal elastic shock that is specified as the impact energy [Nm] and as impulse [Ns]. There is no impact force or imbalance such as vibrators generate.

The effectiveness of the knocker is evaluated according to the following rule:

If the product can be knocked off or made to flow with a hand hammer, the Pneumatic Knocker is also effective.

With pneumatic singold magnet system knockers, a very high impact work is achieved through spontaneously released stored compressed air energy.

In Figure, the knocker is shown in section.

The magnetic impact piston (1), designed as a permanent magnet, adheres to the anchor plate (2) in the basic position by means of magnetic force (↑).

Compressed air is supplied through the connecting thread (3).

After a short time, the pressure force (↓) overcomes the magnetic force and the magnetic impact piston suddenly detaches itself from the anchor plate.

It is accelerated very forcefully by the stored compressed air and hits the striker bolt (4) with a speed of 6 to 7 m/s.

The striker bolt transmits the impact via the welding plate directly to the silo wall.

After venting the knocker, the spring (5) pushes the magnetic impact piston back into its initial position.

Move your cursor to the desired section (smartphone users will need to click):

The selection chart below provides a rough reference for selecting the adequate size and number of Pneumatic Knockers for round silos of 60° cone. In the case of rectangular containers, a minimum of two knockers are mounted on the flatter sides.

.st0{fill: transparent;} 1x K40 1x K63 1x K80 1x K100 1x K125 1x K160 1x K200 2x K63 2x K80 2x K100 2x K125 2x K160 2x K200 3x K63 3x K80 3x K100 3x K125 3x K160 3x K200 4x K63 4x K80 4x K100 4x K125 4x K160 4x K200 5x K63 5x K80 5x K100 5x K125 5x K160 5x K200 6x K63 6x K80 6x K100 6x K125

Thickness of the container

  • Container material
  • Container diameter
  • Operating temperature
  • If present, insulation thickness for the selection of the mounting
  • Choice of version in aluminium, steel or stainless steel
  • Protection type for operating environment

For the electrical components:

  • Desired operating voltage
  • Number of knockers
  • Protection type for operating environment

For help in selecting the right knocker, please send us the completed questionnaire. Any drawings, sketches or photos of existing plants are also helpful.

For the assembly and operation of the pneumatic knocker, the components shown in the picture are required:

  • Attaching the Pneumatic Knocker Welding plate AP. With small pipes, small containers or containers with insulation welded plate in T-shaped APT
  • Pneumatic 3/2 way solenoid valve in the desired control voltage.
  • Electrical control for solenoid valve to desired control voltage. An existing PLC control can also be used.
  • Pneumatic connectors and cables
  • Maintenance unit for pressure reduction to 3.5 bar operating pressure, drainage and lubrication of the knocker is recommended.

Choose the right knocker for your application

We have two types of knockers in our range: our classic ‘singold’ Pneumatic Knocker Type K is suitable for many applications in which the knocker is attached to the silo wall. The special developed Pneumatic Distance Knocker Type QJ is suitable for knocking from a distance against slow-moving drums and filling or emptying stations with moving containers.

  • K 040 3D (STP) – 631.54 KB
    Download
  • K 063 3D (STP) – 585.58 KB
    Download
  • K 080 3D (STP) – 723.25 KB
    Download
  • K 100 3D (STP) – 393.29 KB
    Download
  • K 125 3D (STP) – 421.14 KB
    Download
  • K 160 KFS 3D (STP) – 537.41 KB
    Download
  • Pneumatic Knockers – General Description and Accessories (PDF) – 2.19 MB
    ViewDownload
2x K160 on a rectangular gravel bunker outlet (4 x 4 m) made of 20 mm sheet steel. The hammer marks from the time before the singold knockers were installed are clearly visible.
Another bunker outlet measuring 4 x 4 m. Here, too, two K160 units were installed. The K160, the world’s largest knocker, has a net weight of 62 kg and a height of approximately 0.5 m.
Close-up of one of the retrofitted K160 units below one of the originally installed vibrators, which had remained unsuccessful.
Also popular in the food industry: Here is our smallest model, the K40, mounted on a container above a screw conveyor.
Plant manufacturer Derichs also relies on singold knockers. Who can find the knocker in the picture? 🙂

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What type of Pneumatic Knocker do you require?We have two types of knockers in our range: Our classic ‘singold’ Pneumatic Knocker Type K is suitable for many applications attaching the knocker on the silo wall. The special developed Distance-Knocker Type QJ is suitable for knocking from a distance against slow-moving drums and filling or emptying stations with moving containers.
Flow condition of product / material
Product flow problem occurence
What is the shape of the silo?
Dimensions of the Silo (round)
Dimensions of the Silo (rectangular)
Specification of the Rotating Drum
Has the silo added insulation?
Are any reinforcements added on the silo walls?(Ribs, stifflings etc)
Information about the product handled

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Conditions on site

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Do you require any accessories?Available accessories for installation and operation of Pneumatic Knocker
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