Pneumatic blast rooms
Modular pneumatic blast rooms SAF with the workspace size of 2.5 (up to 40) x 2.5 (up to 9) x 2.5 (up to 8) m (l x w x h) are intended for component surface pre-treatment in single-part and small productions. They can also be used for pre-treatment of large-size products, e.g. steel constructions, wheel and rail vehicles, etc. that cannot be treated in any other kind of blasting equipment. According to their application, metallic or non-metallic abrasives can be used.
The blast room consists of sheeting room version with sound insulation, or a masonry room version. On either one or both ends of the blast room, there is a gate (double-wing, composite gate with manual or machine control), which secures the treated components transport in and out of the blast room.
The blast room has lighting (halogen lamps or fluorescent lights), which illuminates the entire room interior.
Inner walls of the blast room casing are lined with damping abrasion-resistant material (PVC with a textile ply). This material is suspended on steel ropes, which are gripped to the upper room corners. The same material is used for gate and ceiling lining. This material dampens the falling abrasive and thus protects both the machine operator and inner walls of the room form the effects of falling abrasive.
Compared to the ‘common’ black rubber, this material has the following advantages:
- its lifetime is comparable with that of 3 mm thick rubber
- lower price
- lower weight
- easier exchange of damaged parts
The blast room floor is made of floor grates, which create the work area for the operator (min. 40 x 4 mm). A system of abrasive removal is placed under the floor. It consists of oblong scraper conveyors and a traverse worm or scraper conveyor. The traverse conveyor can be placed anywhere in the workspace of the room.
The conveyors carry the abrasive in oblong hoppers into a traverse hopper, and its conveyor transports the abrasive into the elevator base. The elevator transports the abrasive, and all impurities collected during blasting, into a two- or three-stage abrasive separator. Its revolving screen removes large impurities from the abrasive, and delivers them into a container or a plastic bag through a flexible hose. The abrasive with fine impurities falls through the revolving screen into air separator. Here all fine impurities are removed and delivered into a container or a plastic bag through flexible hoses. After careful cleaning, the abrasive is transported into a dispenser, which is placed under the air separator. From the dispenser, the abrasive is delivered into pneumatic blast units dispensers through a short pipeline with a regulating gate.
According to the jet chamber size and capacity requirements, the chamber is equipped with one to four pneumatic jet units (see Mobile pneumatic blast units).
The blast room is equipped with a dust collector. Its exhaust fan exhausts dust created during the blasting process, from the room. It also exhausts dust (fine mechanical impurities) from abrasive that passes through the abrasive air separator. The dust collector has filtering cartridges, which are automatically cleaned with back air pulses (see Dust collectors above 2000).
The dust collector can be placed either in the interior or in the outside sheltered atmosphere.
The equipment operator carries out the blasting process inside the blast room. Considering the working environment, the operator must be equipped with safety blasting devices (see Protective equipments), which protect him from the effects of blasting.
The effects of blasting on the operator:
- the effects of glancing abrasive – operator protection –blasting outfit, blasting helmet and jacket
- dustiness - operator protection – blasting helmet with breathing air inlet, including its cleaning
- noise level – blastting helmet with sound insulation
Safety devices supplied by our company meet the above mentioned requirements.
Most often, the treated components are charged into the chamber on track or wheel filling cars (see Filling cars).
During higher components blasting, various types of fixed (tipping) platforms or pneumatic tread platforms can be used in the blast room.