BARRIER FOR SPINDLES OF A TEXTILE MACHINE Russian patent published in 2017 - IPC D01H1/16 E04B1/84 

FIELD: textile and paper.

SUBSTANCE: invention relates to textile industry and concerns noise-attenuating barrier for textile machines. Barrier for spindles of a textile machine comprises a metal casing installed using brackets on a spindle bar of the machine, on the inner surface of the metal casing there is a vibration-absorbing layer, made in the form of elastic sheet vibration-absorbing material with internal loss coefficient not lower than 0.2, or composite material, or plasticate of “Agat”, “Antivibrat”, “Schwim” type. Thickness of the vibration-absorbing layer arranged on plates 2…4 times exceeds thickness of the plates. Spindles turn from a belt drive and are secured on the spindle bar of the machine by means of elastic damping gaskets from elastomer. Ratio of their total stiffness to bending stiffness of the spindle bar is within optimal range of 0.01…0.1. Metal case is located in the zone of spindles along their row and is box-shaped, and covers both rows of spindles of the machine. Plates are arranged on the casing on its inner side and on both sides, top and bottom, are coated with vibration-absorbing layers with sound-absorbing layers arranged on them. On upper and lower planes of the casing there are process holes Z₁ and Z₂. Ratio of total area of F₁ of the process holes to the total area of casing F is within optimal range of values F₁/F=0.1…0.4. Sound-absorbing element of the barrier of spindles comprises a smooth surface and a perforated surface, between which a multilayer sound-absorbing structure is arranged, made in form of rigid and perforated walls, between which two layers are arranged: sound-reflecting layer, adjacent to rigid wall, and sound-absorbing layer, adjoining perforated wall. Layer of sound reflecting material is made with complex profile, consisting of evenly distributed hollow tetrahedrons, which enable to reflect sound waves incident in all directions. Perforated wall has the following perforation parameters: hole diameter – 3÷7 mm, perforation percentage – 10÷15 %. Holes can be made as holes of circular, triangular, square, rectangular or rhomboid profile. In case of non-circular holes, it is necessary to consider as nominal diameter maximum diameter of circle inscribed in polygon. Sound-absorbing material used is mineral wool on basalt base of “Rockwool” type, or mineral wool of “URSA” type, or basalt wool of P-75 type, or glass wool lined with glass felt, or foamed polymer, for example, polyethylene or polypropylene. Surface of fibrous sound absorbers is treated with special porous air-permeable paints (for example, “Acutex T”), or coated with air-permeable fabrics or nonwoven materials, for example, “Lutrasil”.

EFFECT: invention provides higher efficiency of noise reduction.

3 cl, 2 dwg