CN2051252U

CN2051252U - Punch plate for absortion of medium-low frequency

Info

Publication number: CN2051252U
Application number: CN 89214500
Authority: CN
Inventors: 邓焱
Original assignee: Hefei University of Technology
Current assignee: Hefei University of Technology; Hefei Polytechnic University
Priority date: 1989-07-31
Filing date: 1989-07-31
Publication date: 1990-01-17

Abstract

The utility model discloses a punch plate for absorption of medium-low frequency directly used for the project of sound absorption, noise reduction and sound deadening, which is composed of a thin plate with peripheral ribs which is equispaced with concentric through holes and convex circles and a thick plate which is connected with the thin plate. The punch plate for absorption of medium-low frequency is pressed of single expanded perlite as skeletal material, and it has the advantages that it has remarkable sound absorptivity towards the medium-low frequency, and it is more improved than the existing sound absorption plate. The punch plate for absorption of medium-low frequency has the characteristic that it has simple manufacture process, light weigh and good tenacity, and it has embossed and all the colours, and the surface doesn't need to paint, the cost price is low, etc.

Description

Punch plate for absortion of medium-low frequency

The utility model relates to acoustic engineering cavity resonance sound-absorbing structure, particularly a kind of suction medium and low frequency perforated plate that is directly used in sound absorption, noise abatement, noise reduction engineering.

At present, video display, culture and education etc. public with the industrial construction engineering in, the sound absorption construction plate of used sound absorption, noise abatement, noise reduction is as " listed structure in the acoustics design handbook (China Construction Industry Press, the 137th page) is to be composited with cement mortar perforated plate and expanded perlite.Its weak point is that centering low frequency absorption efficient is very low, and sound absorption coefficient is partial to more than the 1000HZ; The combination process complexity of two kinds of materials, weight is big, and is frangible, and outward appearance is coarse and crude, and finish coatings influences acoustically effective.In addition, the acoustical board of the suction medium and low frequency made of also useful other materials.After boring a hole, fill out ultra-fine glass silk floss etc. with aluminium sheet, its cost costliness, and acoustically effective still can not make the people satisfied.

The purpose of this utility model is to provide the sound absorption perforated plate of the good suction medium and low frequency of having of a kind of cheapness performance.It only is composited with homogenous material, and technology is simple, and is in light weight, flexible, and the good and surface of outward appearance does not need to paint again.

Suction medium and low frequency perforated plate described in the utility model is by being evenly equipped with concentric perforation and dome and having the thin plate of peripheral muscle and the slab that is attached thereto is formed.

Now contrast accompanying drawing and connecting shaping construction technology down, the utility model is described in detail.

Fig. 1 is 1/4th vertical views of the present utility model.Be stitched together with four Fig. 1, just can express one of the utility model complete overlook plate shape.

Among the figure, (1) is thin plate, and (2) are slabs, and (3) are the peripheral ribs of thin plate.H, h ₁, h ₂, h ₃, h ₄The each several part thickness of difference display plate.L represents rib width, and β is 60 ° of draft angles.D is perforation (4) aperture, and d1 is dome (a 5) external diameter.Perforation (4) and dome (5) are concentric, and D is the center to center distance of perforation (4) and dome (5).

The utility model is to use the expanded perlite homogenous material, the perforated plate of the suction medium and low frequency of the monoblock that is composited. Entire plate is suppressed at twice, one-shot forming. Used mould is box-like metal punching block and hard plastic template. The base plate of box-like metal punching block is provided with the piercing die nail. The hard plastic mould Be carved with the ridge design pattern on the surface of plate and be provided with the mould that can make on the punching block base plate and follow closely the hole of passing.

At first the hard plastic template is put in the box-like metal punching block. Then take expanded perlite as aggregate, take the mineral pigment of gypsum and required tone as toner,, transfer and mix as binding agent with glue (for example resembling 801 glue). The aggregate that accent the is mixed box-like metal punching block of packing into, about 2～3cm is thick, uses press weight. Press gets final product at 50～100 tonnes. With the profiled sheeting that press was pressed, should be as shown in Figure 1 and the desired thin plate with peripheral rib (3) of the top part of Fig. 2 (1). Be evenly equipped with concentric perforation (4) and dome (5) on it, the thick h4 of peripheral rib (3) is 1.5～2.5cm, and rib width l is 0.7～1.3cm, and the thick h1 of thin plate (1) is 0.7～1.3cm, and the thickness of slab h2 of dome place is 1.0～1.5cm. Perforation (4) aperture d is 0.5～1.0cm, and it is 1.5～2.0cm that dome (5) is located footpath d1, and the centre-to-centre spacing D of perforation (4) and dome (5) is 2.0～7.0cm. Continue the dress aggregate, 4～5cm is thick again, gently presses with press, forms loose and is linked to be the slab (2) of an integral body with thin plate (1). Requiring thickness of slab h3 is 2.0～5.0cm, and draft angle β is 60, also is that monoblock thickness of slab h is that 3.0～6.5cm is finished product with the air oven dry. The outward appearance of finished product is required low saturation color harmony ridge design pattern. The appearance and size of monoblock perforated plate is 50 * 10 * (3.0～6.5) cm.

The utility model has the advantage of that its centering low frequency absorption performance is remarkable. Compare with existing acoustic board, its acoustically effective: when 125HZ, acoustic absorptivity α brings up to 0.6 by 0.17; During 250HZ, α brings up to 0.79 by 0.26; When 500HZ was above, α reached more than 0.8. In addition, owing to use homogenous material, twice compacting, one-shot forming, technology is greatly simplified; And having in light weightly, good toughness has embossing, can have a shades of colour; Only need during construction to add cement with glue, just can directly be attached on the wall, the surface advantage such as do not need to paint again.

Claims

1, a kind of is aggregate with the expanded perlite, with gypsum and mineral pigment is toner, with glue is cementing agent, and the suction medium and low frequency perforated plate of compression moulding is characterized in that by being evenly equipped with concentric perforation (4) and dome (5) and having the thin plate (1) of peripheral rib (3) and the slab (2) that is attached thereto is formed.

2, suction medium and low frequency perforated plate as claimed in claim 1, the thickness of slab h1 that it is characterized in that thin plate (1) is 0.7～1.3cm, perforation (4) aperture d is 0.5～1.0cm, dome (5) diameter d 1 is 1.5～2.0cm, perforation (4) and dome (5) center to center distance D are 2.0～7.0cm, slab (2) thickness of slab h ₃Be 2.0～5.0cm, entire plate appearance and size is 50 * 50 * (3.0～6.5) cm.