KOCHETOV ACOUSTIC EMCLOSURE FOR TEXTILE MACHINE SPINDLE Russian patent published in 2017 - IPC D01H1/16 

FIELD: textile, paper.

SUBSTANCE: acoustic enclosure for the spindles of a textile machine, containing a casing, installed on the machine spindle rail at the level of its spindles along their row, with vibration- and noise-absorbing layers fixed to its inner surface, and on the outside there are plates, cantilevered to it along the row of machine spindles, and a vibration absorbing layer on their lower surface. The spindles on the spindle rail of the machine are installed by means of elastic gaskets made of elastomer. The ratio of their total rigidity to the bending stiffness of the spindle rail lies in the optimum range of the following values: 0.01…0.1, and the thickness of the vibration-absorbing layer, placed on the plates, is 2…4 times the thickness of the plates. As the material of the vibration-absorbing layer, an elastic sheet vibration-absorbing material with a coefficient of internal losses of not less than 0.2 or a composite material or a plasticate are used. And as a sound-absorbing material of the casing, the elements of mineral wool, based on basalt, or mineral wool, or basalt wool, or fiber glass, covered with glass wool, or foamed polymer, polyethylene or polypropylene are used. The entire surface of the sound-absorbing material is covered with an acoustically transparent material. According to the invention, the spindle enclosure comprises of a sound-absorbing device made in the form of rigid and perforated walls, between which there is a multi-layer sound-absorbing element made in the form of five layers. Two of the layers, adjacent to the walls, are sound-absorbing layers of materials of different densities, and three central layers are combined. The axial layer is made sound-absorbing, and two symmetrically located and adjacent layers are made of a sound-reflecting material consisting of uniformly distributed hollow tetrahedra, allowing to reflect the sound waves falling in all directions. Each of the perforated walls has the following perforation parameters: the diameter of the holes is 3÷7 mm, the percentage of the perforation is 10%÷15%. Holes can be of round, triangular, square, rectangular or diamond shape. In case of unround holes the nominal diameter shall be maximum diameter of circumference inscribed in a polygon.

EFFECT: better noise reduction.

3 dwg