CN105355192A - Ball mill acoustic hood noise control method - Google Patents
Ball mill acoustic hood noise control method Download PDFInfo
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- CN105355192A CN105355192A CN201510621899.3A CN201510621899A CN105355192A CN 105355192 A CN105355192 A CN 105355192A CN 201510621899 A CN201510621899 A CN 201510621899A CN 105355192 A CN105355192 A CN 105355192A
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- acoustic hood
- acoustic
- ball mill
- noise
- motor
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
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- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Food Science & Technology (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention relates to a noise control method, in particular to a ball mill acoustic hood noise control method. The ball mill acoustic hood noise control method includes: performing ball mill noise characteristic analysis by taking a motor and a speed reducer of the ball mill as objects, establishing an acoustic hood finite element model by ANASYS finite element software, analyzing to adopt an acoustic hood of a broadband composite acoustic absorption structure for denoising, mounting the closed acoustic hood on the motor of the ball mill, optimizing the shape of the acoustic hood, and subjecting the acoustic hood to finite element analysis and calculation so as to achieve noise control of a ball mill house, wherein when the acoustic hood is mounted, a distance is reserved between the inner wall of the acoustic hood and the motor to decrease coupling resonance generation possibility, and vibration isolation treatment is performed among the acoustic hood, the motor and a motor base to change rigid connection into elastic connection. The ball mill acoustic hood noise control method has the advantages that the ball mill acoustic hood of the improved broadband composite acoustic absorption structure is remarkable in acoustic insulation effect, and denoising performance of the acoustic hood is improved.
Description
Technical field
The present invention relates to a kind of Control of Mechanical Noise method, particularly relate to a kind of sound shroud for ball mill noise control method.
Background technology
Bowl mill is widely used Super-fine grinder plant equipment in domestic and international commercial production, bowl mill is of wide application, and is widely used in ore dressing, the industry such as cement building material and chemical industry, but bowl mill can produce great noise in the course of the work, very harmful to the personnel near it; When ball mill barrel is exposed, noise figure can up to more than 110dB (A), be in each commercial production of the world today plant equipment produce produce one of the most serious noise source of noise pollution.Therefore, the noise abatement of bowl mill becomes one of problem of Chinese scholars extensive concern, has obtained certain effect in noise abatement simultaneously.But the material of application ball coal pulverizer acoustic hood is more single at present, structure is also fairly simple, normally using the material such as asphaltic base and rubber as damping vibration attenuation material, using the porous sound-absorbing material such as asbestos wool and glass wool as main body acoustic absorbant, therefore, the noise abatement effect of bowl mill has breakthrough more difficult.
Broadband combined type sound absorption structure is made up of perforation protection slab, acoustic absorbant and cavity, and this structure sound absorption frequency range is wide, and comprise medium-high frequency and low-frequency noise, noise reduction is obvious
[1], wherein, air layer and perforated plate structure mainly improve the sound absorbing capabilities to low-frequency noise, the noise of acoustic absorbant dominant absorption medium-high frequency.Wherein utilize air layer to improve the acoustical absorption coefficient of acoustic absorbant, utilize acoustic absorbant to absorb the energy of sound wave, also utilize the resonant structure of perforated plate to improve absorptive character in addition.Therefore broadband combined type sound absorption structure is incorporated in sound shroud for ball mill, ball mill noise can be made to administer and produce breakthrough.
Summary of the invention
The object of the present invention is to provide a kind of sound shroud for ball mill noise control method, the method improve the acoustic hood of broadband combined type sound absorption structure, noise reduction is obvious, meet engineering requirement, for solving practical problems provides reference frame, for the noise processed of other bowl mill provides reference.
The object of the invention is to be achieved through the following technical solutions:
A kind of sound shroud for ball mill noise control method, described method with the motor and speed reducer of bowl mill for object, to ball mill noise specificity analysis, ANASYS finite element software is adopted to set up acoustic hood finite element model, analyze the acoustic hood noise reduction adopting broadband combined type sound absorption structure, according to surveyed noise signal, its frequency spectrum is analyzed, judge the main frequency producing noise; Ball grinder motor is installed closed acoustic hood, and acoustic hood wall body material adopts to be inhaled every fabricated structure, and wherein the sound absorber of acoustic hood inside adopts wideband combined type acoustic board structure; The damping sound-insulation board that the wall body that wherein insulates against sound then adopts damping material to make; Secondly, the profile of acoustic hood is optimized, when installing acoustic hood, require to leave a segment distance between acoustic hood inwall and motor, reduce the possibility producing coupled resonance, then between acoustic hood and motor and motor base three, carry out vibration isolation process, become being rigidly connected into elasticity and connect, again to acoustic hood finite element analysis computation, reach the noise abatement of ball milling machine room.
Advantage of the present invention and effect are:
1. the present invention with the motor and speed reducer of bowl mill for research object, after to ball mill noise specificity analysis, propose, at motor, the noise reduction schemes that acoustic hood is main noise reduction means is installed outward, ANASYS finite element software is adopted to set up acoustic hood finite element model, analyze the noise reduction of the acoustic hood adopting broadband combined type sound absorption structure, indicate the deficiency of some region noise reduction of acoustic hood of this structure.By proposing a kind of acoustic hood of broadband combined type sound absorption structure of improvement, noise reduction is improved obviously, meets engineering requirement, for solving practical problems provides certain reference frame.
2. the present invention adopts theory calculate, the method that simulation analysis and engineering practice combine is studied the broadband composite structure acoustic hood anti-acoustic capability improved, practice result shows, pass through Curve guide impeller, defening effect improves significantly, meet technical requirement, for research acoustic hood anti-acoustic capability provides reference frame simultaneously.For the noise processed of other bowl mill provides reference.Be particularly suitable for the improvement of the main equipment noises such as steam turbine, wind energy conversion system, fan blower, greatly can reduce the noise of equipment, economic benefit is obvious.
Accompanying drawing explanation
Fig. 1 ball grinder motor acoustic hood walled structure schematic diagram;
Fig. 2 ball grinder motor acoustic hood sound absorption wall body sound absorption characteristics curve;
Fig. 3 acoustic hood finite element grid model;
The moire pattern of Fig. 4 acoustic hood;
Broadband sound absorption structure after Fig. 5 improves;
Acoustic hood moire pattern after Fig. 6 Curve guide impeller;
Fig. 7 acoustic hood design sketch;
Fig. 8 improves front noise pattern;
Fig. 9 improves noise pattern in back cover.
Embodiment
Below in conjunction with embodiment, the present invention is described in detail.
The present invention with the motor and speed reducer of bowl mill for research object, after to ball mill noise specificity analysis, propose, at motor, the noise reduction schemes that acoustic hood is main noise reduction means is installed outward, ANASYS finite element software is adopted to set up acoustic hood finite element model, analyze the noise reduction of the acoustic hood adopting broadband combined type sound absorption structure, indicate the deficiency of some region noise reduction of acoustic hood of this structure.According to surveyed noise signal, its frequency spectrum is analyzed, judge the main frequency producing noise.
1 acoustic hood design: through known to the actual testing and analysis at bowl mill scene, the principal element of bowl mill surrounding enviroment noise pollution is caused to derive from ball grinder motor, therefore working group needs to adopt the method ball mill noise of acoustic hood to administer, mainly closed acoustic hood is installed on ball grinder motor, the method can effective noise source propagate with, reduce noise radiation.Power of motor 800KW, rotating speed 3000r/min.
Specifically take following measures: first, ball grinder motor is installed closed acoustic hood, acoustic hood wall body material adopts to inhale every fabricated structure, and sound shroud for ball mill walled structure schematic diagram as shown in Figure 1.Wherein the sound absorber of acoustic hood inside adopts wideband combined type acoustic board structure; The damping sound-insulation board that the wall body that wherein insulates against sound then adopts damping material to make.Adopt this structure effectively can not only reduce acoustic hood cover external noise energy transmission, the noise pollution in cover also can be controlled effectively, and the service condition of motor and serviceable life are in increase in various degree.
Secondly, the profile of acoustic hood is optimized, when installing acoustic hood, require to leave a segment distance between acoustic hood inwall and motor, reduce the possibility producing coupled resonance, thus affect defening effect, then between acoustic hood and motor and motor base three, carry out vibration isolation process, becoming being rigidly connected into elasticity to connect, reducing low-frequency noise.But the installation of acoustic hood should consider the ventilation and heat problem of ball grinder motor operation, therefore chip noise elimination blinds is installed on acoustic hood and solves ventilation and heat problem.Finally, sound level oise insulation factor and the parameter such as frequency band oise insulation factor and insertion loss of acoustic hood is calculated by oise insulation factor formula.
For individual layer homogeneous sheet material, oise insulation factor experimental formula:
R=16lgM+14lgf-29
R-oise insulation factor in formula;
Surface density (the kg/m of M-plate
2)
F-incident sound wave frequency (Hz)
Select 1mm steel plate, calculate its octave band oise insulation factor, result of calculation is as shown in table 1, and Fig. 2 is the sound absorption characteristics curve of sound absorption wall body.
Table 1 ball grinder motor acoustic hood frequency band oise insulation factor
2 acoustic hood FEM (finite element) calculation
By above analytical calculation, the oise insulation factor of acoustic hood can be calculated.But this oise insulation factor is the ideal value under the condition not having external interference.This ideal value and the noise reduction needed for engineering practice have a certain distance.Consider the factor such as engineering in esse noise reverberation impact and quadratic noise simultaneously, simply the oise insulation factor after acoustic hood is installed to two motors, likely can not meet noise reduction requirement, therefore need to carry out finite element analysis to acoustic hood, make it play better performance.
2.1 finite element analysis
Acoustic hood housing is steel plate, and setting up thickness of shell is 0.01m, and damping is the acoustic hood finite element model of 0.01, passes through analysis and solution.Utilize finite element analysis software ANASYS to analyze the anti-acoustic capability of two kinds of Sound Insulation for Structure covers below, represented the noise reduction of acoustic hood by the color change of cloud atlas, set up the finite element model of acoustic hood as shown in Figure 3.
Fig. 4 is the cloud atlas of acoustic hood and the response function of acoustic hood that use installation to have the broadband sound absorption structure manufacture of patented technology (patent No.: ZL200520092542.2).
From Fig. 4, the color of the outside of acoustic hood is known, and the color of acoustic hood cover body cloud atlas, from the head-to-foot portion of cover, gradually becomes red by blueness, known by figure scale value corresponding in Fig. 4, and blue expression sound pressure level is smaller, and defening effect is good; Red expression sound pressure level is larger, and defening effect is not good, and Fig. 4 divides middle and upper part, is blue, represents that the acoustic pressure of this acoustic hood is less, and the color of side becomes red from blueness, and represent that the noise of radiation is in continuous increase, defening effect noise reduction is more and more poorer.
Acoustic hood after 2.2 improvement
Because the noise reverberation that motor produces is very complicated, only broadband sound absorption structure is adopted to be the needs that can not meet engineering noise reduction.Damping material must be arranged on the outside of broadband acoustic absorbant, be combined into the sound insulationg board of combined type, broadband sound absorption structure after improving as shown in Figure 5, at the skin of broadband sound absorption structure, one deck damping material is installed, noise reduction is improved obviously, mainly by between damping material and broadband sound absorption structure and damping material interior detail micro tribology, the energy of partition losses is changed into heat energy, can noise transmission be reduced.
Fig. 6 is the emulation cloud atlas of the acoustic hood using the broadband combined type sound absorption structure improved, the color of this acoustic hood cover body cloud atlas is from the head-to-foot portion of cover, substantially be all blue region, known by figure scale value corresponding in Fig. 6, sound pressure level is less, and defening effect is good, by emulating the contrast of cloud atlas with Fig. 4, the defening effect of the broadband combined type sound absorption structure acoustic hood improved is more obvious, illustrates that these technical measures are effective, can implement.
The noise abatement of 3 ball milling machine rooms
For proving feasibility and the superiority of the broadband combined type sound absorption structure acoustic hood improved further, noise abatement is carried out to certain factory's ball milling machine room.Consider not affecting that bowl mill normally runs, under the condition of ventilation and heat and maintenance, ball grinder motor is installed the acoustic hood of the broadband combined type sound absorption structure of improvement, acoustic hood wall body material adopts to inhale every fabricated structure, acoustic hood installed chip noise elimination blinds to carry out noise abatement.As shown in Figure 7.To noise testing in the cover improved after front and improvement, obtain spectrogram as shown in Figure 8 and Figure 9.Measured result shows, adopt the broadband combined type sound absorption structure acoustic hood noise reduction improved obvious, 8dB(A is reduced than adopting the oise insulation factor of common broadband combined type sound absorption structure acoustic hood), meet national environmental standard, reach good noise reduction.
Claims (1)
1. a sound shroud for ball mill noise control method, it is characterized in that, described method with the motor and speed reducer of bowl mill for object, to ball mill noise specificity analysis, adopt ANASYS finite element software to set up acoustic hood finite element model, analyze the acoustic hood noise reduction adopting broadband combined type sound absorption structure, according to surveyed noise signal, its frequency spectrum is analyzed, judges the main frequency producing noise; Ball grinder motor is installed closed acoustic hood, and acoustic hood wall body material adopts to be inhaled every fabricated structure, and wherein the sound absorber of acoustic hood inside adopts wideband combined type acoustic board structure; The damping sound-insulation board that the wall body that wherein insulates against sound then adopts damping material to make; Secondly, the profile of acoustic hood is optimized, when installing acoustic hood, require to leave a segment distance between acoustic hood inwall and motor, reduce the possibility producing coupled resonance, then between acoustic hood and motor and motor base three, carry out vibration isolation process, become being rigidly connected into elasticity and connect, again to acoustic hood finite element analysis computation, reach the noise abatement of ball milling machine room.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510621899.3A CN105355192A (en) | 2015-09-25 | 2015-09-25 | Ball mill acoustic hood noise control method |
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| CN201510621899.3A CN105355192A (en) | 2015-09-25 | 2015-09-25 | Ball mill acoustic hood noise control method |
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| CN105355192A true CN105355192A (en) | 2016-02-24 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108518363A (en) * | 2018-04-24 | 2018-09-11 | 华北电力大学 | A kind of supercritical water noise reduction damping device |
| CN108776176A (en) * | 2018-04-28 | 2018-11-09 | 中国电力科学研究院有限公司 | A kind of method and system for measuring reactor sound insulation enclosure oise insulation factor |
| CN109046620A (en) * | 2018-08-28 | 2018-12-21 | 攀枝花学院 | Sound shroud for ball mill |
Citations (7)
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| CN2051253U (en) * | 1989-06-14 | 1990-01-17 | 马鞍山钢铁公司 | Control device for noise of wide-frequency-spectrum and large acoustic level |
| CN101992346A (en) * | 2009-08-20 | 2011-03-30 | 沈阳工业大学 | Ultrasonic wave welding head linkage heat-dissipation acoustic hood |
| CN103016415A (en) * | 2011-09-22 | 2013-04-03 | 启东启控消声设备有限公司 | Blower acoustic shield |
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| CN2051253U (en) * | 1989-06-14 | 1990-01-17 | 马鞍山钢铁公司 | Control device for noise of wide-frequency-spectrum and large acoustic level |
| CN101992346A (en) * | 2009-08-20 | 2011-03-30 | 沈阳工业大学 | Ultrasonic wave welding head linkage heat-dissipation acoustic hood |
| CN103016415A (en) * | 2011-09-22 | 2013-04-03 | 启东启控消声设备有限公司 | Blower acoustic shield |
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Non-Patent Citations (2)
| Title |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108518363A (en) * | 2018-04-24 | 2018-09-11 | 华北电力大学 | A kind of supercritical water noise reduction damping device |
| CN108776176A (en) * | 2018-04-28 | 2018-11-09 | 中国电力科学研究院有限公司 | A kind of method and system for measuring reactor sound insulation enclosure oise insulation factor |
| CN108776176B (en) * | 2018-04-28 | 2022-07-01 | 中国电力科学研究院有限公司 | Method and system for measuring sound insulation quantity of sound insulation cover of reactor |
| CN109046620A (en) * | 2018-08-28 | 2018-12-21 | 攀枝花学院 | Sound shroud for ball mill |
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Application publication date: 20160224 |