So that the recoil of the knocker can be captured, it must be well anchored on larger masses (e.g. machine frame, with poured concrete steel profiles) or be fastened with a solid beam over a drum. The Pneumatic Knocker is mounted according to Fig. 3. 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 down. This prevents the ingress of dust, moisture and aggressive vapours.
The compressed air is set to 4-4.5 bar, which corresponds to 0.5 bar above the release pressure of the pneum. impulse knocker (depending on Type approx. 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 (approx. 3 to 5 seconds). Select the break time according to the material flow. It must not be to short, so that the pneumatic 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 is to be ensured that the piston rod has reached the basic position before the next impact is triggered. If necessary, the basic position of the piston rod is 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 can supply the necessary equipment for the electrical control of the pneum. impulse knocker.
Regulations for accident prevention and mounting
It is only allowed to install and use the Pneumatic Impulse Knockers 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 actuated 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.