FIELD: machine-tool industry. SUBSTANCE: at least one of device nozzles is directed to internal surface of casing rim. Curvilinear plates with nozzles mounted on then are secured over entire length of vacant edges of side walls. They are provided with holes-air ducts through which nozzles communicate with one another. In addition, casing ear has inlet hole, and cover ear has outlet hole which communicate with each other through circular grooves of cover axle interconnected by holes. EFFECT: higher efficiency. 2 cl, 5 dwg
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