CN104133949A - Ball mill machine room noise control method - Google Patents
Ball mill machine room noise control method Download PDFInfo
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- CN104133949A CN104133949A CN201410339170.2A CN201410339170A CN104133949A CN 104133949 A CN104133949 A CN 104133949A CN 201410339170 A CN201410339170 A CN 201410339170A CN 104133949 A CN104133949 A CN 104133949A
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- ball mill
- finite element
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- mill barrel
- cylindrical shell
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention provides a ball mill machine room noise control method, which relates to a noise control method. The method comprises the following steps that: a tube body of a ball mill is used as a study object; a function of the load received by the tube body under the normal work condition is derived; a finite element method is adopted for carrying out finite element simulation on the tube body to obtain stress and strain distribution; a stress concentration part of the tube body in a disengaging point and a falling point in a loaded state is determined; then, acoustic simulation software is used for calculating an acoustic radiation mode of the tube body of the ball mill; and the main noise frequency band of the tube body of the ball mill is determined to be the lower frequency band. The ball mill machine room noise control method has the advantages that safety and high efficiency of the operation of large-scale mechanical equipment are ensured; the service life of the large-scale mechanical equipment is prolonged; and the maintenance cost of the large-scale mechanical equipment is reduced. Meanwhile, the ball mill machine room noise control method is also effective on the noise control of the large-scale mechanical equipment, and is particularly suitable to be used for the noise control on large-scale equipment such as a steam turbine, a wind power generator and a blast blower; the fault rate of the equipment can be greatly reduced; and the economic befits are obvious.
Description
Technical field
The present invention relates to a kind of noise abatement method, particularly relate to a kind of bowl mill machine room noise abatement method.
Background technology
Bowl mill widespread use in many fields such as mine, metallurgy, cement, building materials, but can bring great noise pollution at operational process, not only has influence on people's rest and work, also people healthy has been caused to great harm; The overriding noise source of bowl mill comprises grating of gears, cylindrical shell noise and noise of motor, and its middle cylinder body noise is maximum noise source; And cylindrical shell noise is the mechanical noise that cylindrical shell clashes between steel ball and shell liner, steel ball and steel ball, coal cinder and steel ball when rotated; Ball carries on the liner plate impinging upon in cylindrical shell for a long time, and the very large impulsive force that can produce can make liner plate produce vibration and radiation strong noise simultaneously.Therefore, analyze the ess-strain regularity of distribution of ball mill barrel under in working order very important for definite its noise radiation characteristic.
At present, ball mill noise analysis is all based on on-the-spot test, cannot set up the relation between barrel stress and noise radiation.For this reason, based on finite element method, the research bowl mill in normal working conditions ess-strain in cylindrical shell distributes, and according to the Radiation Modes of LOAD FOR result calculating cylindrical shell, thereby determine the relation between ball mill barrel stress state and noisiness, formulate suitable noise abatement measure simultaneously, by actual bowl mill noise reduction process process, proved that the method has very important meaning for the radiated noise that reduces bowl mill.
Summary of the invention
The object of the present invention is to provide a kind of bowl mill machine room noise abatement method, the present invention adopts Finite Element Method to carry out finite element analogy to ball mill barrel and tries to achieve ess-strain distribution, determine the dispersal point of vertical tube body under loaded state and the stress concentration portion position in setting point, utilize acoustics simulation software to calculate the Radiation Modes of ball mill barrel, the overriding noise frequency range of having determined ball mill barrel is low-frequency range.Make noise in the machine room 6dB that declined, reach effect well.
The object of the invention is to be achieved through the following technical solutions:
A kind of bowl mill machine room noise abatement method, described method comprises take ball mill barrel as research object, the cylindrical shell suffered load function in normal working conditions of having derived, adopt Finite Element Method to carry out finite element analogy to cylindrical shell and try to achieve ess-strain distribution, determine the dispersal point of vertical tube body under loaded state and the stress concentration portion position in setting point, then utilize acoustics simulation software to calculate the Radiation Modes of ball mill barrel, the overriding noise frequency range of having determined ball mill barrel is low-frequency range;
Concrete steps are:
A. the LOAD FOR of cylindrical shell: the load that ball mill barrel is subject to mainly comprises: the centrifugal force load from heavy load and medium material of the load of gear, medium material, by formula, calculate, obtain bowl mill shock load in normal operation;
B. the finite element simulation of ball mill barrel:
1) foundation of finite element model, obtains the ball mill barrel finite element model after grid is divided through computational analysis;
2) ess-strain of ball mill barrel distributes, and maximum stress concentrates on the region, middle and upper part of cylindrical shell, is the setting point of bowl mill broken material,
3) ball mill barrel model analysis, solves natural frequency and the vibration shape of structure;
C. the sound modal analysis of cylindrical shell: the acoustic mode state within the scope of calculating from 20HZ to 200HZ, the mode efficiency upper frequency point of cylindrical shell sound radiation mainly concentrates on low-frequency range;
D. the noise abatement measure of ball milling machine room: sound absorption is processed noise is declined.
A kind of described bowl mill machine room noise abatement method, described employing Finite Element Method is carried out finite element analogy to cylindrical shell and is tried to achieve ess-strain distribution, determines the dispersal point of vertical tube body under loaded state and the stress concentration portion position in setting point.
A kind of described bowl mill machine room noise abatement method, described method utilizes acoustics simulation software to calculate the Radiation Modes of ball mill barrel, and the overriding noise frequency range of having determined ball mill barrel is low-frequency range.
Advantage of the present invention and effect are:
The present invention guarantees security and the high efficiency of heavy mechanical equipment operation, extend heavy mechanical equipment serviceable life, reduce its maintenance cost.The present invention is simultaneously effective equally to the noise abatement of large-scale machinery and equipment, is particularly suitable for the improvement of the main equipment noises such as steam turbine, wind energy conversion system, fan blower, can greatly reduce the failure rate of equipment, and economic benefit is obvious.
Accompanying drawing explanation
Fig. 1 is that ball of the present invention carries cylindrical shell impulsive force schematic diagram;
Fig. 2 is ball mill barrel finite element model figure of the present invention;
Fig. 3 is ball mill barrel stress diagram of the present invention;
Fig. 4 is cylindrical shell strain figure of the present invention;
Fig. 5 is ball mill barrel first-order bending vibation mode picture of the present invention;
Fig. 6 is ball mill barrel second-order bending vibation mode picture of the present invention;
Fig. 7 is ball mill barrel of the present invention the 3rd first order mode figure;
Fig. 8 is ball mill barrel the first rank acoustic mode state figure of the present invention;
Fig. 9 is ball mill barrel second-order acoustic mode state figure of the present invention;
Figure 10 is ball mill barrel of the present invention the 5th rank acoustic mode state figure;
Figure 11 is ball mill barrel of the present invention the 7th rank acoustic mode state figure;
Figure 12 is broadband denoising structure figure of the present invention.
Embodiment
Below in conjunction with accompanying drawing illustrated embodiment, the invention will be further described.
The present invention be take ball mill barrel as research object, the cylindrical shell suffered load function in normal working conditions of having derived, adopt Finite Element Method to carry out finite element analogy to cylindrical shell and try to achieve ess-strain distribution, determine the dispersal point of vertical tube body under loaded state and the stress concentration portion position in setting point.Then utilize acoustics simulation software to calculate the Radiation Modes of ball mill barrel, the overriding noise frequency range of having determined ball mill barrel is low-frequency range.Finally, the method that adopts suspention sound absorber and body of wall sound absorption according to Radiation Modes analysis result is to the processing that absorbs sound of bowl mill machine room, makes noise in the machine room 6dB that declined, and reaches effect well.
The present invention adopts Finite Element Method to carry out finite element analogy to cylindrical shell and tries to achieve ess-strain distribution, determines the dispersal point of vertical tube body under loaded state and the stress concentration portion position in setting point.Then utilize acoustics simulation software to calculate the Radiation Modes of ball mill barrel, the overriding noise frequency range of having determined ball mill barrel is low-frequency range.Finally, the method that adopts suspention sound absorber and body of wall sound absorption according to Radiation Modes analysis result, to the processing that absorb sound of bowl mill machine room, makes the noise decline in machine room, reaches effect well.
Embodiment:
The LOAD FOR of 1 cylindrical shell
The load that ball mill barrel is subject to mainly comprises: the centrifugal force load from heavy load and medium material of the load of gear, medium material.Known according to theorem of momentum, the ball mounted mass that the ball in work equals to dish out in the unit interval to the impulsive force of cylindrical shell while being loaded in is multiplied by ball and carries and the relative velocity of cylindrical shell at drop point place, and impact force's calculation is shown in Fig. 1.
The ball mounted mass of dishing out in the unit interval is:
Wherein,
.
Wherein,
.
Ball carries impulsive force and exists
ythe component of direction is:
By above formula integration, obtained:
In like manner can obtain ball carries impulsive force and exists
xthe component of direction is:
Will
substitution above formula, obtains:
In above-mentioned formula,
lfor grinding mill barrel effective length, the m of unit;
for ball carries loose thickness, units/kg/m
3,
r 1for ball carries revolution maximum radius,
r 2for ball carries revolution least radius,
v x1
for ball is loaded in drop point place
the speed of direction,
v x2
for carrying drop point place cylindrical shell, ball exists
the speed of direction,
v y1
for ball is loaded in drop point place
the speed of direction,
v y2
for carrying drop point place cylindrical shell, ball exists
the speed of direction.By formula above, can obtain the angle of fall is:
By above-mentioned formula, can obtain bowl mill shock load in normal operation.
The finite element simulation of 2 ball mill barrels
The foundation of 2.1 finite element models
From formula, ball carries the impulsive force of ball mill barrel can be changed with the variation of steel ball size.The parameter of known certain bowl mill is as follows:
l=7m,
n=17.7rpm,
r 1=0.85m,
r 2=1.65
m, calculating respectively the impulsive force of several different-diameter steel balls, can find, the diameter of steel ball increases, and impulsive force increases thereupon, coincide with theoretical analysis result.On the basis of above bowl mill parameter, selection diameter is that the steel ball of 30 centimetres is simulated, impulsive force is applied on ball mill barrel solid model, consider ball grinder tube body structure, adopt 3D solid unit herein, so both facilitated computational analysis, can conform to practical work process again.Ball mill barrel finite element model after computational analysis obtains grid division is as Fig. 2.
The ess-strain of 2.2 ball mill barrels distributes
According to the finite element model of Fig. 2, the stress and strain calculating on a certain cross section of ball mill barrel by ANSYSY software distributes as shown in Figure 3 and Figure 4.From Fig. 3 and Fig. 4, can find out, when imposed load is while being axial, the strain and stress at certain cylindrical shell two ends, truncation surface place is all symmetric, and the stress on cylinder inboard wall reduces along with the rising of height.In Fig. 3, maximum stress concentrates on the region, middle and upper part of cylindrical shell, be the setting point of bowl mill broken material, in Fig. 4, maximum strain appears near the dispersal point of cylindrical shell, these ess-strain regularities of distribution are consistent with bowl mill actual conditions, illustrate that the ball mill barrel finite element model of setting up is consistent with actual motion condition herein.
2.3 ball mill barrel model analyses
The object of model analysis is natural frequency and the vibration shape that solves structure.Because the number of moving part of bowl mill is lower, only calculated first three rank natural frequency of ball mill barrel, first three first order mode is if Fig. 5 is to as shown in Fig. 7.The natural frequency of ball mill barrel is much larger than the frequency of operation of bowl mill, so the possibility of bowl mill generation resonance is less.By Fig. 5, to Fig. 7, can be found out, the middle part of ball mill barrel is the part of load concentration, is the most weak region of intensity.
The sound modal analysis of 3 cylindrical shells
Radiation Modes is similar in appearance to natural frequency and the vibration shape in structural vibration problem, in order to study the ball mill barrel sound field regularity of distribution, on the basis of model analysis, utilize acoustics simulation software, cylindrical shell is carried out to the analysis of acoustic mode state, the acoustic mode state within the scope of calculating from 20HZ to 200HZ.First and second close with its structural vibration frequency, five, seven rank acoustic mode states, respectively as shown in Fig. 7-Tu l0.By above analysis, the acoustic mode state of ball mill barrel comprises, second order is similar with five rank mode, illustrates that the mode efficiency upper frequency point of ball mill barrel sound radiation mainly concentrates on low-frequency range.
The noise abatement measure of 4 ball milling machine rooms
Through above, analyze, consider not affecting that unit normally moves, under unit maintenance and precondition attractive in appearance, Acoustic Radiation Characteristic result based on to this ball mill barrel, intend to adopt suspended absorber, metope sound absorption mode to the processing that absorbs sound of bowl mill machine room.In order to shorten and to adjust the room reverberation time, be chosen on the metope of machine room and ceiling and install and horizontally suspend suspended absorber; Adopted binomial patented technology Assembled plate for absorbing acoustic energy and glass steel compound noise reduction board, structure as shown in figure 12.The compound sound-absorption structural consisting of perforation protection slab, acoustic absorbant and cavity has wider sound sucting band, it utilizes acoustic absorbant to absorb the energy of sound wave on the one hand, utilize on the one hand air layer to improve the acoustical absorption coefficient of acoustic absorbant, also utilize in addition the resonant structure of perforated plate to absorb acoustic energy.Acoustic absorbant mainly absorbs high-frequency noises, and air layer and sound absorbent perforated structure mainly improve the sound absorbing capabilities to low-frequency noise.
The material great majority that metope sound absorption is processed are acoustic boards, and the performance of acoustic absorbant all has certain relation with itself quantity, size, structural form etc., and the thickness of material is while reaching certain value, could play sound absorption; Again because open cell type acoustic absorbant is generally that the acoustical absorption coefficient of medium-high frequency is larger, and the acoustical absorption coefficient of low-frequency range is smaller; For improving noise reduction whole in machine room, wall acoustic board percentage of perforation gets 9 percent, thereby increases the acoustical absorption coefficient of wall to noise low-frequency component.Last test result shows, after processing by above sound absorption, after noise abatement, noise reduction is very obvious, and through environmental administration's monitoring, the noise of the ball milling machine room 6dB that declined, has reached good noise reduction result.
?
Claims (3)
1. a bowl mill machine room noise abatement method, it is characterized in that, described method comprises take ball mill barrel as research object, the cylindrical shell suffered load function in normal working conditions of having derived, adopt Finite Element Method to carry out finite element analogy to cylindrical shell and try to achieve ess-strain distribution, determine the dispersal point of vertical tube body under loaded state and the stress concentration portion position in setting point, then utilize acoustics simulation software to calculate the Radiation Modes of ball mill barrel, the overriding noise frequency range of having determined ball mill barrel is low-frequency range;
Concrete steps are:
A. the LOAD FOR of cylindrical shell: the load that ball mill barrel is subject to mainly comprises: the centrifugal force load from heavy load and medium material of the load of gear, medium material, by formula, calculate, obtain bowl mill shock load in normal operation;
B. the finite element simulation of ball mill barrel:
1) foundation of finite element model, obtains the ball mill barrel finite element model after grid is divided through computational analysis;
2) ess-strain of ball mill barrel distributes, and maximum stress concentrates on the region, middle and upper part of cylindrical shell, is the setting point of bowl mill broken material,
3) ball mill barrel model analysis, solves natural frequency and the vibration shape of structure;
C. the sound modal analysis of cylindrical shell: the acoustic mode state within the scope of calculating from 20HZ to 200HZ, the mode efficiency upper frequency point of cylindrical shell sound radiation mainly concentrates on low-frequency range;
D. the noise abatement measure of ball milling machine room: sound absorption is processed noise is declined.
2. a kind of bowl mill machine room noise abatement method according to claim 1, it is characterized in that, described employing Finite Element Method is carried out finite element analogy to cylindrical shell and is tried to achieve ess-strain distribution, determines the dispersal point of vertical tube body under loaded state and the stress concentration portion position in setting point.
3. a kind of bowl mill machine room noise abatement method according to claim 1, is characterized in that, described method utilizes acoustics simulation software to calculate the Radiation Modes of ball mill barrel, and the overriding noise frequency range of having determined ball mill barrel is low-frequency range.
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| CN201410339170.2A CN104133949A (en) | 2014-07-16 | 2014-07-16 | Ball mill machine room noise control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104484504A (en) * | 2014-11-25 | 2015-04-01 | 沈阳化工大学 | Ball mill machine room noise control method |
| CN104485095A (en) * | 2014-11-24 | 2015-04-01 | 沈阳化工大学 | Noise control method of oil pumping unit |
Citations (2)
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| US20030044593A1 (en) * | 2001-01-02 | 2003-03-06 | Vaidyanathan K. Ranji | Continuous fiber reinforced composites and methods, apparatuses, and compositions for making the same |
| CN103259089A (en) * | 2013-04-22 | 2013-08-21 | 南京中网卫星通信股份有限公司 | Control method and control device of X-waveband weather radar antenna |
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2014
- 2014-07-16 CN CN201410339170.2A patent/CN104133949A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030044593A1 (en) * | 2001-01-02 | 2003-03-06 | Vaidyanathan K. Ranji | Continuous fiber reinforced composites and methods, apparatuses, and compositions for making the same |
| CN103259089A (en) * | 2013-04-22 | 2013-08-21 | 南京中网卫星通信股份有限公司 | Control method and control device of X-waveband weather radar antenna |
Non-Patent Citations (1)
| Title |
|---|
| 刘欢等: "球磨机筒体的声辐射特性分析与噪声治理", 《有色金属（选矿部分）》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485095A (en) * | 2014-11-24 | 2015-04-01 | 沈阳化工大学 | Noise control method of oil pumping unit |
| CN104484504A (en) * | 2014-11-25 | 2015-04-01 | 沈阳化工大学 | Ball mill machine room noise control method |
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