Mounting and Operation – Pneumatic Impulse Knocker Type QJ

In order for the recoil of the Impulse Knocker to be intercepted, it must be well anchored to a larger mass (e.g. machine frame, with concrete poured steel profiles) or be fastened with a solid beam over a drum.
The Impulse Knocker is mounted according to our Installation Guideline.
It must be ensured that the distance to the knocking location is adhered to according to the data sheet and that the deaeration borings are facing downwards. This will prevent ingress of dust, moisture and aggressive vapours.

Installation Guideline

Air Pressure and Operating Intervals
The compressed air is set to 4-4.5 bar, which corresponds to 0.5 bar above the release pressure of the Impulse Knocker (depending on knocker type approximately 2.5 to 3.5 bar). The length of the operating time should be so adjusted to make sure that the impact will be released (approximately 3 to 5 seconds). Select the break time according to the material flow. It must not be too short, so that the Impulse Knocker has time for deaeration (deaeration time min. 4 sec) and should as far as possible be long enough to reduce the wear and tear and compressed air consumption.

For shorter interval times it has to be ensured that the piston rod has reached its basic position before the next impact is triggered. If necessary, the basic position of the piston rod has to be ensured with a suitable end switch. Otherwise, the knocker could endure significant damage.

Adjusting the Electrical Control Unit
For product conveying out of a container, cycle times of 5 to 20 seconds are recommended. Too frequent knocking should in any case be avoided, otherwise the product would be compressed. Continuous falling product should be knocked off in cycle times up to 30 minutes. If the layer of product becomes too thick, an avalanche-like break-off could block the outlet or overload following machines. If several knockers are mounted, it is preferable to activate them one after the other. The product flow and the air consumption is then constant. We are happy to supply the necessary equipment for the electrical control of the Impulse Knocker.

Regulations for Accident Prevention and Mounting
It is only allowed to install and use the Pneumatic Impulse Knocker as a knocking and evacuating device on silos, containers, cylinders and walls, after having paid special attention to the instructions and in accordance with the technical data given therein.
To protect persons and to prevent damage to the knocker, the Impulse Knocker shall be activated only after having been tightly screwed on. Considerable damage can be caused by the knocker missing an attachment point.
Mounting, maintenance, pre-operational and operational as well as post-operational handling of the equipment and the accessories shall only be carried out by trained and qualified personal in compliance with the legal prescriptions and safety regulations. The knocker has to be installed, secured and controlled so that – in case of self loosened screws, cracked welded joints or other specific defects – there will be no danger for persons, animals, products or objects to be damaged or polluted. All screws and all nuts must be checked as to their tightness and be tightened by means of a torque wrench prior to the commissioning and at regular intervals.

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