| 摘要 |
FIELD: textile, paper. ^ SUBSTANCE: acoustic screen is intended for reducing noise, created by aerodynamic twinning devices on spinning machines of "" type, and can be used for wide-band damping of noise produced by production equipment by means of sound absorption technique. Acoustic screen contains faced with sound-absorbing material and acoustically transparent film cover, which hermetically closes unit of aerodynamic twinning devices together with initial product, roller of drawing out device and belt. On roller of drawing out device with total length L and outer diameter D at least three turnings of diameter d are made. Ratio of outer diameter D of drawing out device roller to diameter of turnings d lies within optimal interval D/d=1.04?1.05, ratio of total roller length L to length L2 of central turning on roller lies within optimal interval L/L2=4.3?4.4, and ratio of length L2 of central turning to length L1 of side turnings on roller lies within optimal interval L2/L1=2.0?2.2. Sound-absorbing material on inner surface of cover is made of the base of aluminium-containing alloys with their further filling with titanium hydride or air with density within 0.5?0.9 kg/m3, with compression strength within 5?10 MPa and bending strength within 10?20 MPa. Sound-absorbing material can be made in form of crumb from hard vibrodamping materials, for instance elastomer, polyurethane, placed into envelope from sound-transparent material, size of crumb fractions being within optimal interval 0.3?2.5 mm. ^ EFFECT: increase of efficiency of noise absorption due to increase of sound absorption coefficient by increasing sound absorption surfaces with preservation of overall dimension. ^ 3 cl, 3 dwg |
