ACOUSTIC SCREEN FOR PSK TYPE SPINNING MACHINES Russian patent published in 2018 - IPC E04B1/82 D02G3/28 

FIELD: acoustics.

SUBSTANCE: invention relates to industrial acoustics, for example, directed at noise reduction of spindle drive of spinning machines. Technical result is achieved by the fact that the acoustic screen for PSK (self-twisting spinning machines) type spinning machines contains a soundproof cover that seals the aerodynamic torsion device (ATD) assembly together with the original product, the drawer roller and the belt. Cover is lined with sound-absorbing material and an acoustically transparent film of "poviden" type (copolymer of vinyl chloride and vinyliden chloride). Drawer roller with a total length L and outer diameter D has at least three grooves with a diameter d: central groove of length L₂ and lateral grooves of length L₁, while the ratio of the outer diameter D of the drawer roller to the diameter d of the grooves lies in the optimum range of values: D/d=1.04…1.05, and the ratio of the total length L of the roller to the length L₂ of the central groove lies in the optimum range of values: L/L₂=4.3…4.4, and the ratio of the length L₂ of the central groove to length L₁ of the lateral grooves lies in the optimum range of values: L₂/L₁=2.0…2.2, the sound-absorbing material on the inner surface of the cover is made on the basis of aluminum-containing alloys, the lining of the soundproof cover is made with resonant inserts and comprises a smooth and perforated surface between which a layer of sound-absorbing material of a complex shape is disposed, a layer of complex shape is an alternation of solid sections and hollow sections, the hollow sections are formed by prismatic surfaces that have a parallelogram shape in a section parallel to the plane of the drawing. Inner surfaces of the parallelogram have a toothed structure, the tips of the teeth turned inward the prismatic surfaces, and the edges of the prismatic surfaces are fixed respectively on the smooth and perforated walls, and cavities of hollow sections formed by prismatic surfaces are filled with a sound absorber, and between a smooth surface and continuous sections of a layer of sound-absorbing material of a complex shape, as well as between the perforated surface and solid sections, resonant plates with resonant inserts that perform the functions of the Helmholtz resonator necks are located.

EFFECT: technical result is an increase in the efficiency of noise suppression due to the expansion of the frequency spectrum in resonant modes by introducing resonant elements into the lining that expand the spectrum of the noise suppression frequencies.

1 cl, 4 dwg