Acoustic screen for spindle drive. RU patent 2508422.

IPC classes for russian patent Acoustic screen for spindle drive. RU patent 2508422. (RU 2508422):

D01H13/14 - Warning or safety devices, e.g. automatic fault detectors, stop motions (warning or safety devices for filamentary material, not intimately associated with spinning or like machines B65H; safety devices of general application F16P; indicating devices of general application G08B)

Another patents in same IPC classes:

Protection and cleaning device for caterpillar comb of drafting element / 2343236
Device is meant for protection and cleaning of caterpillar combs of the drafting element of textile machine. The device contains rotatable cylindrical brush, which position in relation with the drafting device changes as a result of winding of textile material around the caterpillar. The coiled material is removed with the cylindrical brush that causes increase of its visible diameter and causes the turn of the bearing of the cylindrical brush movable support or a lever. The cylindrical brush is situated on the way of withdrawal preferably as close as possible to the drafting cylinders. The cylindrical brush position may change in relation to the drafting device consequently from the position of comb cleaning till the withdrawal position. The sensor for determination of the cylindrical brush position in relation to the drafting device stops the machine in case of withdrawal of the cylindrical brush as a result of winding of textile material around the caterpillar. The axis of rotation of the cylindrical brush is set on the lever or on the movable base rotating around their axis that is immovable in relation to the machine body and is rigidly fixed with the machine body.

Acoustic screen for spindle drive / 2508422
Acoustic screen for the spindle drive comprises a rigid wall on which a layer of sound absorptive material is applied. The rigid wall is made box-shaped, it covers the spindle drive and has technological holes for heat abstraction. According to the invention, the rigid wall is additionally attached to the sound absorbing element which is made in the form of a smooth and a perforated walls, between which the sound absorbing material is located, placed in two layers, one of which, which is harder, is formed solid and profiled, and the other, which is soft, is made discontinuous and is located in the focus of the sound-reflecting surfaces of the first layer. The solid profiled layer of sound absorbing material is made of a material which coefficient of sound reflection is greater than the coefficient of sound absorption. The profiles are formed by spherical surfaces, interconnected so that, in general, each of the profiles forms an integral domed profile, focusing the reflected sound at the same soft sound absorber, which is located at the focus of the solid profiled layer made in the form of bodies of revolution, such as balls, ellipsoids of revolution, and is fastened by means of rods, parallel to the perforated wall and rigidly connected to the smooth wall by means of the vertical links.

Acoustic screen for spinning machines / 2511528
Acoustic screen for spinning machines comprises a cover, on which a layer of a sound-absorbing element is fixed, tightly closing a unit of an aerodynamic torsion device together with a source product and a roller of a drawing instrument with a driving belt. According to the invention, the sound-absorbing element is made in the form of a smooth and a perforated walls, between which there is a sound-absorbing material, arranged in two layers, one of which, a more rigid one, is made as solid and shaped, and the other one, soft one, is made as interrupted and arranged in the focus of sound-absorbing surfaces of the first layer. The solid shaped layer of the sound-absorbing material is made from a material, in which the coefficient of sound reflection is more than the coefficient of sound absorption compared to the coefficient of sound absorption, besides, profiles are formed by spherical surfaces, connected to each other so that as a whole each of profiles forms a solid dome-shaped profile, which focuses the reflected sound to one and the same soft sound absorber, which is arranged in the focus of the solid shaped layer. Sound absorbers are made in the form of revolution bodies, for instance, in the form of balls, ellipsoids of rotation, and are fixed with the help of rods, parallel to a perforated wall and rigidly connected to the smooth wall by means of vertical joints.

FIELD: textiles, paper.

SUBSTANCE: acoustic screen for the spindle drive comprises a rigid wall on which a layer of sound absorptive material is applied. The rigid wall is made box-shaped, it covers the spindle drive and has technological holes for heat abstraction. According to the invention, the rigid wall is additionally attached to the sound absorbing element which is made in the form of a smooth and a perforated walls, between which the sound absorbing material is located, placed in two layers, one of which, which is harder, is formed solid and profiled, and the other, which is soft, is made discontinuous and is located in the focus of the sound-reflecting surfaces of the first layer. The solid profiled layer of sound absorbing material is made of a material which coefficient of sound reflection is greater than the coefficient of sound absorption. The profiles are formed by spherical surfaces, interconnected so that, in general, each of the profiles forms an integral domed profile, focusing the reflected sound at the same soft sound absorber, which is located at the focus of the solid profiled layer made in the form of bodies of revolution, such as balls, ellipsoids of revolution, and is fastened by means of rods, parallel to the perforated wall and rigidly connected to the smooth wall by means of the vertical links.

EFFECT: increased efficiency of noise attenuation by improving the coefficient of sound absorption by increasing the surfaces of sound absorption while maintaining the overall dimensions.

2 dwg

The invention relates to industrial acoustics, in particular to the broadband .

Known acoustic screen containing the perforated wall and acoustical absorbent layer (see kN. V.I. Protection of labour in the textile industry. M: , 1987, p.56, Fig.12).

The closest technical solution to a technical nature and the achieved result is the acoustic screen by the patent RF №2463412, cl. F01N 1/04 [prototype], containing the perforated wall and acoustical absorbent layer.

The disadvantage of technical decision taken as a prototype, is relatively low efficiency of noise control.

Effect : increased efficiency of noise control at the expense of increase of the degree of absorption by increasing absorption surfaces while maintaining the overall dimensions.

This is achieved by the fact that in the acoustic screen for the drive spindles, containing the hard wall, which is applied a layer of absorbent material, the rigid wall is made of the box-shaped form, covering the drive spindle, and has holes for heat removal, and to a rigid wall is additionally attached absorbing element, which is made in the form of a smooth and perforated walls, between which it is placed absorbing material, located in two layers, one of which, more stringent, executed by the profiled, and the other soft executed intermittent and is located in the focus surfaces of the first layer and a solid corrugated layer of absorbent material is made from a material which the coefficient of reflection of the sound more than a sound absorption coefficient, and profiles are formed by spherical surfaces, interconnected in such a way that in General each of the profiles, forms a solid dome-shaped profile, focusing reflected sound the same soft absorber, which is located in the focus of a solid corrugated layer, made in a form of rotary bodies, for example in the form of balls, ellipsoids of rotation, and fastened using the rods, parallel perforated wall and rigidly connected with the smooth wall by means of vertical linkages.

Figure 1 shows the acoustic screen in the section, figure 2 - scheme of sound-absorbing element.

Acoustic screen (figure 1) for the drive spindle 1 with a belt 2 contains a hard wall 3), which is applied a layer of absorbent material 6 and 7. Rigid wall 3 and 4 is made of the box-shaped form, covering actuator 2 spindle 1, and has holes Z 1 and Z 2 to dissipate the heat and the hard wall additionally attached absorbing element 5.

Absorbing element 5 of the screen (figure 2) is made in the form of a smooth 8 and perforated 9 walls, between which it is placed absorbing material, located in two layers, one of which, more hard 10, executed by the profiled, and the other soft 11 made intermittent and is located in the focus surfaces of the first layer 10.

Solid profiled layer 10 absorbent material is made from a material which the coefficient of reflection of the sound more than a sound absorption coefficient, and profiles of 12 formed spherical surfaces, interconnected in such a way that in General each of the profiles of 12 forms a solid dome-shaped profile, focusing reflected sound the same soft absorber 11. Intermittent absorber 11, located in the focus of solid profiled layer 10 is in the form of rotating bodies, for example in the form of balls, ellipsoids of rotation, and fastened using the rods 13, parallel perforated wall 9 and rigidly connected with the smooth wall by means of vertical links (not shown).

Acoustic screen works as follows.

Sound energy radiated drive 2 and rotating spindle 1, gets on the wall 3, 4, lined with sound-absorbing element 5 and absorbing layers 6 and 7. The transition of the sound energy in thermal dissipation, dispersion of energy) occurs in the pores absorbers, represent a model resonators "Helmholtz, where energy losses occur due to friction, oscillating with the frequency excitation of the air mass, located in the neck resonator walls on the neckline, with a view of the extensive network of pores absorber.

Absorbing element works as follows.

Sound energy, passing through the perforated wall 9, falls on an intermittent absorber 11, located in the focus of solid profiled layer of 10, which is in the form of bodies of rotation, for example in the form of balls, ellipsoids of rotation. Then the sound energy falls on the continuum of corrugated layer 10 absorbent material formed by spherical surfaces, forming a solid dome-shaped profile, focusing reflected sound the same soft absorber 11. The transition of the sound energy in thermal dissipation, dispersion of energy) occurs in the pores absorbers, represent a model resonators "Helmholtz, where energy losses occur due to friction, oscillating with the frequency excitation of the air mass, located in the neck resonator walls on the neckline, with a view of the extensive network of pores absorber. Coefficient of perforation of a perforated wall is assumed equal to or greater than 0.25. To prevent rash soft absorbers provided fiberglass-e.g. EZ-100, located between with material and perforated wall 9 (not shown).

Acoustic screen for the drive spindles, containing the hard wall, which is applied a layer of absorbent material, the rigid wall is made of the box-shaped form, covering the drive spindle, and has holes for the removal of heat, wherein the rigid wall additionally attached absorbing element, which is made in the form of a smooth and perforated walls, which comprise absorbing material, located in two layers, one of which, more stringent, executed by the profiled, and the other, soft, made intermittent and is located in the focus surfaces of the first layer and a solid corrugated layer of absorbent material is made from a material which the coefficient of reflection of the sound more than a sound absorption coefficient, and profiles are formed by spherical surfaces, interconnected in such a way that in General each of the profiles, forms a solid dome-shaped profile, focusing reflected sound the same soft absorber, which is located in the focus of a solid corrugated layer, made in a form of rotary bodies, for example in the form of balls, ellipsoids of rotation and fastened using the rods, parallel perforated wall and rigidly connected with the smooth wall by means of vertical linkages.