KOCHETOV CASING FOR TEXTILE MACHINE SPINDLES Russian patent published in 2017 - IPC D01H1/16 

FIELD: textile, paper.

SUBSTANCE: casing for spindles of a textile machine contains an enclosure, installed on the spindle rail of the machine at the level of its spindles along their row, and vibration- and sound-absorbing layers fixed on its inner surface. The fence is made of the upper and lower parts, each of which consists of a body made of sheet angle sections with an angle of 90° at the apex, rigidly fixed to the spindle rail in its upper and lower parts, and a vertically disposed removable cover. The thickness of the vibration-absorbing layer, placed on plates, is 2-4 times the thickness of the cover and body plates. The casing elements are mounted on the machine by means of rubber vibration isolators. The overall rigidity of them is lower than the rigidity of the vibration-isolating suspension of the spindle. An elastic sheet vibration-absorbing material with internal loss ratio of not less than 0.2, or a composite material or plasticate can be used as a vibration-absorbing material. The sound-absorbing element of the enclosure contains smooth and perforated surfaces, between which there are two layers: a sound-reflecting layer adjacent to the rigid wall, and a sound-absorbing layer adjacent to the perforated wall. The sound-reflecting layer material includes of uniformly distributed hollow tetrahedra allowing to reflect the sound waves from all directions, and the perforated wall has the following perforation parameters: the hole diameter 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 is regarded as the maximum diameter of the circumference, inscribed in a polygon. The sound-absorbing material is basalt-based mineral wool. The surface of sound fiber absorbers is treated with air-permeable porous paints or covered with air-permeable fabrics or nonwoven materials. According to the invention, between the sound-absorbing layer and the sound-reflecting layer material adjacent to it, there is an element of resonant type, made in the form of a rigid resonance plate with resonant holes that act as the neck of Helmholtz resonators. The volume functions of the Helmholtz resonator are performed by the layer of sound-reflecting material consisting of uniformly distributed hollow tetrahedra that allow to reflect sound waves from all directions.

EFFECT: better noise reduction.

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