specific localization of dust emission
As already mentioned, the effective control of dust emission is possible only with the help of local suction.
Of the above types of local shelters and suction for dust control is almost completely excluded umbrellas. They can give effect only when the dust is associated naughty. A small amount of light dust in the intensive heat flow (possibly in conjunction with water vapor) - a typical example of concomitant dust hazard. Powerful stream, carries with light dust, well caught by an umbrella. In this case, we apply an umbrella as shelter and local exhaustion, but subject to conditions specified above.
suction side panels and pumps is relatively rarely used when dealing with dust. However, they can be effective for minor and non-directional dust emission, which yields a dust cloud, but no torch.
Slit-like pumps and suction-hopper quite common when dealing with dust. Funnel, placed in the way of the dust plume, almost catches him. If the torch at least partially bypasses the funnel effect of dust removal is not achieved even with a substantial amount of exhausted air. Pumps, funnels are used for grinding and sharpening machines, a lathe and milling machines in the processing of fragile materials (plastic) boot mold powders, plastics, etc., with their help by sucking dust from shredders, and unwinding the wire during transportation and reloading of bulk materials in containers that are at hand forwards, etc.
With intense dust emission only rational shelters are all sorts of covers. Hide hearth dust and prevent the breakout of dust through the holes and leaks shelter - this is the containment of dust through the ventilation system.
Construction of casings, harboring pockets of dust emission - one of the most important and yet little of allowed tasks. This problem is equally should be resolved as the technology of the industry and experts on ventilation. A well-constructed housing - the key to effective dust control. Conversely, no even the most powerful dust extraction ventilation does not give proper effect if released dust is knocked out of the casing in the room.
Many cases where housing, harboring a place of dust cloud does not create enough obstacles to knock out the dust. Then resorted to the creation of double shelters in which the primary enclosure is recycled into the shelter. Get something like a jacket in the jacket. As an example one can refer to shelter income in places the material in the auger or additional sealing point where they exit the material from the crusher by belt conveyor. As we know, the usual worm has casing, from which the air suction. In some cases, the fine dust and toxic this is not enough: in place of falling material by high pressure dust knocked through unavoidable, even hairline cracks the shell. To prevent this part of the screw and estrus is capacious shelter, with exhaust air. The scheme of this capacious collapsible shelter is shown in Fig. 8.
Sealing podfundamentnogo Space jaw crusher to create a secondary shelter in addition to the existing assembly line type of shelter SIOT shown in Fig. 9, which does not require special explanation.
In some cases, dust control is not only through ventilation. It is known that wet materials pylyat less than dry. If the moisture content of the material is not essential for the technology, it is always advantageous to increase to the extent possible. Artificial wetting of dusty materials is a common name gidroobespylivaniya. However, when talking about gidroobespylivanii, one must distinguish two processes:
a) wetting the entire mass of the material by sprinkling it with water, such as perforated pipes, or through nozzles;
b) spraying water to finely divided state in the dust by mechanical or pneumatic way to contain the dust cloud due to the coagulation of dust particles and their natural precipitation.
Creating a water mist in the place of a dust cloud by spraying water with air is called pnevmogidroobespylivaniya.