CASING FOR DRAW FRAME Russian patent published in 2017 - IPC D01H1/16 

FIELD: textile, paper.

SUBSTANCE: casing for a draw frame comprises a sound-insulating enclosure in the form of a hinged lid mounted on the vibro-active machine units; the sound-insulating enclosure is fixed to the head part of the machine, comprising combed strips, and vibration-sound-absorbing layers are fixed onto the inner enclosure surface. The thickness of the vibration-absorbing layer is 2-4 times the thickness of the lid material. The casing elements are mounted onto the machine by means of vibration-insulating rubber gaskets, the total rigidity of which is lower than the lid rigidity. According to the invention, the sound-absorbing element of the sound-insulating enclosure comprises a smooth surface and a perforated surface, 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 layer of the sound-reflecting material is made of the complex profile, in the form of evenly distributed hollow tetrahedrons allowing to reflect sound waves falling in all directions, and the perforated wall has the following perforation parameters: the hole diameter - 3÷7 mm, the perforation percentage - 10÷15%. As per shape, the holes can be made as holes having round, triangular, square, rectangular, or diamond profile. In case of non-circular holes, the maximum diameter of a circle inscribed in a polygon should be considered as the nominal diameter; basalt-based mineral wool with glass-wool lining is used as a sound-absorbing material. Also the sound-absorbing element can be made in the form of five layers, two of which, adjacent to the walls, are sound-absorbing layers of materials of different density, and three central layers are combined. The axial layer is made sound-absorbing, and two symmetrically located adjacent layers are made of a sound-reflecting material of a complex profile, consisting of uniformly distributed hollow tetrahedra with similar parameters.

EFFECT: increased noise reduction efficiency.

2 cl, 3 dwg