| 摘要 |
A pneumatic feed has a body with tubular rod fixed on base. At one end of the rod piston is fixed, at the other end - head with unit for fixation of perforator and distributor of compressed air. The last one is connected by channels to pressure mains, inlet mains, rod cavity and cavity of pipe. Rod cavity is connected to cavity of the body. Telescopic part of rod has protective case connected to the body with fixation against rotation unit and is used for worked-out air outlet. Pneumatic feed according to second variant has telescopic body and safety case. Telescopic safety case has fixation units against turn for each pair of cases being connected and for inner case with fixed body. Pneumatic feed has a channel in upper end of safety case, this is connected to inlet pipeline. Inner surface of bushing and rod at side of the body form circular slot connected to circular channel. The invention promotes decrease of level of dust pollution and noise at discharge of worked-out compressed air from pneumatic feeds to atmosphere, increase of reliability and convenience for work.
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