Pneumatic systems & components

Thor’s hammer of pneumatic knockers

Second Quarter 2024 Pneumatic systems & components

Pneumatic knockers are a type of cylinder that delivers a knock or impact at variable intervals in order to make bulk materials flow better. They are used on containers and silos with material flow problems such as residue buildup, where high-speed vibrators or shakers with soft sinusoidal oscillations are not effective. They reliably remove product residues, caking, and shaft and bridge buildups in a wide variety of manufacturing applications. They are effective, reliable and inexpensive.

What are the advantages of pneumatic knockers?

Have you ever walked through your plant and seen impact marks on cyclones, bins or silos? In all those cases where the flow of material was restarted with a hammer blow, a pneumatic knocker could have been used more efficiently and with less impact on the material. Unlike shakers, vibrators, and even interval knockers, a pneumatic magnetic system knocker can knock on demand, whenever it is needed.

This provides the following advantages:

• For some products, constant knocking tends to condense the material flow rather than promote it. A single, targeted blow is much more effective here than a vibrator.

• Well-directed knocking contributes to noise protection in the factory.

• The impact from the singold knocker only generates a vibration with a large amplitude and does not go through any self-resonance. In contrast to vibrators, this protects the container and the knocker in the best possible way.

• Compressed air consumption is reduced.

• There is no imbalance as with vibrators.

The knocker generates a shock that causes the container wall to vibrate in a decaying manner. The number of vibrations is lower than when using shakers and vibrators, and therefore the risk of vibration cracks is also lower.

To achieve this, there is a magnet inside the knocker. When the pressure of the supplied compressed air overcomes the holding force of the magnet, the knocker is triggered, accelerated very strongly by the compressed air. It strikes the impact pin with great force, which transfers the impact to the container wall. It is operated with a three/two-way valve so that the pressure chamber of the pneumatic magnetic system knocker can be vented. A spring pushes the impact piston back to its original position, and the knocker is then ready for the next application.

The singold pneumatic knocker is low wear, durable and easy to maintain. It also consumes considerably less energy than an interval knocker. Weighing systems for metering operations are also less stressed with a pneumatic knocker than with a vibrator. This reduces the risk of wear-related damage.

What makes singold’s pneumatic knocker so special?

In no performance class is there a more efficient or more powerful pneumatic knocker than the singold pneumatic knocker. Thanks to its ingenious design, the singold pneumatic magnetic knocker produces the greatest possible impact with the lowest possible dead weight.

For more information contact Neu Matics SA, +27 11 865 4452,,


Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Selection of two-port valves: an open and shut case
SMC Corporation South Africa Pneumatic systems & components
Little consideration is generally given to two-port valves because they are often perceived as simple devices that only open and close to control downstream fluid supply. Although this is mechanically true, choosing the optimal two-port valve for your application can make a big difference, saving space, weight and energy consumption.

Integrated Air Solutions expands its compressor rental service
Pneumatic systems & components
The significant growth of the industrial air compressor rental division launched by Integrated Air Solutions under a year ago, has prompted the need for more resources and equipment. Headed up by Rudolf ...

Compressed air drying and monitoring with low dewpoints
Artic Driers International Pneumatic systems & components
Artic Driers manufacturers the Sahara low dewpoint, heatless pressure swing air dryers with SANS 347 pressure code. These desiccant-rich pressure dryers comfortably obtain pressure dewpoints of -40°C.

Tyre-actuated globe valve
Parker Hannifin - Sales Company South Africa Pneumatic systems & components
Parker Hannifin has launched a tyre-actuated pneumatic valve in its Bestobell cryogenic globe valve range. The valve can be operated remotely with a single switch command, providing much greater speed and convenience than a manually operated type.

Oil-free beer and wine processing
Pneumatic systems & components Hydraulic systems & components
The food and beverage industry depends on superior quality, 100% oil-free compressed air to eliminate the presence of unwanted oil vapour throughout the production line.

Ten considerations for optimum use of vacuum technology
Pneumatic systems & components
Vacuum technology plays a huge role in the packaging of foodstuffs and other products. Here are ten considerations to help you use vacuum technology as effectively and efficiently as possible, so that you can optimise processes and cut operating costs.

Case History 191: The weakest link
Pneumatic systems & components
Which is the weakest link in a control loop? The answer, without any doubt is that, in most cases, the final control element is the weakest link.

Thor’s hammer of pneumatic knockers
neaMetrics Pneumatic systems & components
Neu Matics acts as sole distributor for a range of internationally recognised brands, and one of these is the pneumatic knocker from singold.

New IO-Link master future-proofs pneumatic valve systems
Emerson Automation Solutions Pneumatic systems & components
Emerson has introduced a new Class A IO-Link master that provides customers with a cost-effective solution for smart and analogue sensor connectivity on the AVENTICS Series G3 Fieldbus platform.

Versatile cylinder monitoring
ifm - South Africa Pneumatic systems & components
This IO-Link cylinder sensor from ifm, with two configurable hardware outputs, will upgrade your machine in no time.