組合振動(dòng)篩的參數(shù)優(yōu)化及篩面顆粒運(yùn)動(dòng)仿真分析
發(fā)布時(shí)間：2018-09-12 15:32
【摘要】：組合振動(dòng)篩是一種新型研制開發(fā)的振動(dòng)篩,解決一臺(tái)篩機(jī)有不同的振幅、振動(dòng)強(qiáng)度、篩面傾角和堵塞問題,提高了篩分效率。本文研究的組合振動(dòng)篩,上篩采用高頻小振幅,下篩采用低頻大振幅。研究其上下篩參數(shù)的配合優(yōu)化設(shè)計(jì),并對(duì)其篩面上物料的運(yùn)動(dòng)規(guī)律的揭示,利用EDEM對(duì)振動(dòng)篩顆粒物料的仿真分析,找出規(guī)律確定其各參數(shù)對(duì)振動(dòng)篩的影響。本文主要內(nèi)容有:(1)對(duì)組合振動(dòng)篩參數(shù)進(jìn)行正交試驗(yàn)分析,以組合振動(dòng)篩的單位生產(chǎn)率功耗建立數(shù)學(xué)模型,定其為目標(biāo)函數(shù),利用遺傳算法對(duì)其進(jìn)行優(yōu)化設(shè)計(jì),得到一組最佳的參數(shù):上篩振幅為4.12mm、傾角為23.56°、振動(dòng)強(qiáng)度為4.11;下篩振幅8.2mm、下篩傾角19.73°、振動(dòng)強(qiáng)度5.021�？偣挠�0.063kw/t/h降低至0.057kw/t/h,功耗優(yōu)化了近9%。(2)對(duì)組合振動(dòng)篩顆粒物料仿真研究分析,建立物料顆粒接觸模型,用EDEM軟件,對(duì)組合振動(dòng)篩篩面上顆粒物料的運(yùn)動(dòng)分析。借助顆粒粘結(jié)模型,以物料在篩分過程中物料間鍵粘結(jié)的平均數(shù)和物料對(duì)篩面平均切向力作為衡量松散效果的指標(biāo),分析振幅、振動(dòng)強(qiáng)度和篩面傾角對(duì)其影響,隨其增加,松散效果增加,其中,振動(dòng)強(qiáng)度對(duì)篩面上物料松散度影響最大,篩面傾角影響最小。分析了單顆粒在組合振動(dòng)篩面上跳動(dòng)規(guī)律,振幅對(duì)篩面上顆粒拋擲后離開篩面的高度影響最大,傾角影響最小。這是因?yàn)?在其他條件相同情況時(shí),較小振幅下,物料幾乎不被拋起,物料在篩面上發(fā)生滾動(dòng),隨振幅的增加,物料慢慢被拋起在篩面上跳動(dòng)。增大振幅、振動(dòng)強(qiáng)度及篩面傾角使物料松散效果和顆粒跳動(dòng)離開篩面高度的增加,有利于物料快速松散。(3)采用軟干球模型和分層理論對(duì)組合振動(dòng)篩篩面上物料顆粒群進(jìn)行離散元分析。分析得到不同粒度和物料的顆粒群在篩面上的平均分層速率曲線。達(dá)到穩(wěn)態(tài)時(shí),上下篩顆粒分層速率幅值分別在0.58m/s和0.45m/s左右,分析振幅、振動(dòng)強(qiáng)度和傾角與篩面上物料平均速度之間的關(guān)系,得到振動(dòng)參數(shù)與平均速度的回歸模型。篩面傾角對(duì)篩面上顆粒群平均速度影響最大。分析得到篩面上物料具有較大的速度有利于物料快速分層。(4)運(yùn)用EDEM軟件及軟干球模型,對(duì)組合振動(dòng)篩進(jìn)行三維離散元模擬仿真。提出動(dòng)態(tài)累計(jì)篩分效率的概念,對(duì)篩面長(zhǎng)度和篩分效率的研究,得到篩長(zhǎng)和篩分效率的回歸模型,篩分效率隨篩面長(zhǎng)度增加而增加,當(dāng)篩面長(zhǎng)度大于900mm,篩長(zhǎng)與篩寬比值大于4時(shí),篩分效率不再明顯增加。
[Abstract]:The combined vibrating screen is a new developed vibrating screen, which solves the problems of different amplitude, vibration intensity, inclined angle and clogging of a screen machine, and improves the screening efficiency. The combined vibrating screen studied in this paper uses high frequency and small amplitude for upper sieve and low frequency and large amplitude for lower sieve. The optimum design of the upper and lower screen parameters is studied, and the movement law of the material on the screen surface is revealed. The simulation analysis of the particle material of the vibrating screen is carried out by using EDEM, and the influence of each parameter on the vibrating screen is found out. The main contents of this paper are as follows: (1) the parameters of the combined vibrating screen are analyzed by orthogonal test, and the mathematical model is established based on the unit productivity power consumption of the combined vibrating screen, which is defined as the objective function, and the optimization design of the combined vibrating screen is carried out by using genetic algorithm. The optimum parameters were obtained: the amplitude of the upper sieve was 4.12mm, the inclination angle was 23.56 擄, the vibration intensity was 4.11, the amplitude of the lower sieve was 8.2 mm, the angle of the lower sieve was 19.73 擄, and the vibration intensity was 5.021. The total power consumption is reduced from 0.063kw/t/h to 0.057 KW / t / h, and the power consumption is optimized by nearly 9%. (2) the particle contact model of the composite vibrating screen is studied and analyzed by simulation, and the movement analysis of the particle material on the screen surface of the combined vibrating screen is carried out by EDEM software. With the aid of particle bonding model, the average number of bond between materials and the average tangential force of material to sieve surface are taken as indicators to evaluate the loose effect. The effects of amplitude, vibration intensity and sieve inclination angle on it are analyzed. The influence of vibration intensity on the material looseness on the screen surface is the greatest, and the influence on the angle of the sieve surface is the least. The jumping rule of single particle on the surface of the combined vibrating screen is analyzed. The amplitude has the greatest influence on the height of the particles on the screen surface after throwing away from the screen surface, and the influence of inclination angle is the least. This is because when other conditions are the same, when the amplitude is small, the material will not be thrown up, and the material will roll on the screen surface, and with the increase of amplitude, the material will be slowly thrown up on the screen surface. The increase of amplitude, vibration intensity and the angle of inclination of the sieve surface makes the loose effect of the material and the runout of the particle from the height of the sieve surface increased, (3) using soft dry ball model and stratification theory, the particle group on the screen surface of combined vibrating screen is analyzed by discrete element method. The average delamination rate curves of different particle sizes and particle groups on the sieve surface were obtained. When the steady state is reached, the delamination rate amplitude of the upper and lower sieve particles is about 0.58m/s and 0.45m/s, respectively. The relationship between the amplitude, vibration intensity and dip angle and the average velocity of the material on the sieve surface is analyzed, and the regression model between the vibration parameters and the average velocity is obtained. The average velocity of particle group on the sieve surface is most affected by the inclination angle of the screen surface. It is found that the material on the screen surface has a large speed which is conducive to the rapid stratification of the material. (4) using the EDEM software and the soft dry ball model, the three-dimensional discrete element simulation of the combined vibrating screen is carried out. The concept of dynamic cumulative screening efficiency is put forward. The regression model of screen length and screening efficiency is obtained by studying the sieve surface length and screening efficiency. The screening efficiency increases with the increase of sieve surface length. When the sieve surface length is greater than 900mm and the ratio of sieve length to width is greater than 4, the sieving efficiency will not increase significantly.
【學(xué)位授予單位】：江西理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD452
本文編號(hào)：2239458
[Abstract]:The combined vibrating screen is a new developed vibrating screen, which solves the problems of different amplitude, vibration intensity, inclined angle and clogging of a screen machine, and improves the screening efficiency. The combined vibrating screen studied in this paper uses high frequency and small amplitude for upper sieve and low frequency and large amplitude for lower sieve. The optimum design of the upper and lower screen parameters is studied, and the movement law of the material on the screen surface is revealed. The simulation analysis of the particle material of the vibrating screen is carried out by using EDEM, and the influence of each parameter on the vibrating screen is found out. The main contents of this paper are as follows: (1) the parameters of the combined vibrating screen are analyzed by orthogonal test, and the mathematical model is established based on the unit productivity power consumption of the combined vibrating screen, which is defined as the objective function, and the optimization design of the combined vibrating screen is carried out by using genetic algorithm. The optimum parameters were obtained: the amplitude of the upper sieve was 4.12mm, the inclination angle was 23.56 擄, the vibration intensity was 4.11, the amplitude of the lower sieve was 8.2 mm, the angle of the lower sieve was 19.73 擄, and the vibration intensity was 5.021. The total power consumption is reduced from 0.063kw/t/h to 0.057 KW / t / h, and the power consumption is optimized by nearly 9%. (2) the particle contact model of the composite vibrating screen is studied and analyzed by simulation, and the movement analysis of the particle material on the screen surface of the combined vibrating screen is carried out by EDEM software. With the aid of particle bonding model, the average number of bond between materials and the average tangential force of material to sieve surface are taken as indicators to evaluate the loose effect. The effects of amplitude, vibration intensity and sieve inclination angle on it are analyzed. The influence of vibration intensity on the material looseness on the screen surface is the greatest, and the influence on the angle of the sieve surface is the least. The jumping rule of single particle on the surface of the combined vibrating screen is analyzed. The amplitude has the greatest influence on the height of the particles on the screen surface after throwing away from the screen surface, and the influence of inclination angle is the least. This is because when other conditions are the same, when the amplitude is small, the material will not be thrown up, and the material will roll on the screen surface, and with the increase of amplitude, the material will be slowly thrown up on the screen surface. The increase of amplitude, vibration intensity and the angle of inclination of the sieve surface makes the loose effect of the material and the runout of the particle from the height of the sieve surface increased, (3) using soft dry ball model and stratification theory, the particle group on the screen surface of combined vibrating screen is analyzed by discrete element method. The average delamination rate curves of different particle sizes and particle groups on the sieve surface were obtained. When the steady state is reached, the delamination rate amplitude of the upper and lower sieve particles is about 0.58m/s and 0.45m/s, respectively. The relationship between the amplitude, vibration intensity and dip angle and the average velocity of the material on the sieve surface is analyzed, and the regression model between the vibration parameters and the average velocity is obtained. The average velocity of particle group on the sieve surface is most affected by the inclination angle of the screen surface. It is found that the material on the screen surface has a large speed which is conducive to the rapid stratification of the material. (4) using the EDEM software and the soft dry ball model, the three-dimensional discrete element simulation of the combined vibrating screen is carried out. The concept of dynamic cumulative screening efficiency is put forward. The regression model of screen length and screening efficiency is obtained by studying the sieve surface length and screening efficiency. The screening efficiency increases with the increase of sieve surface length. When the sieve surface length is greater than 900mm and the ratio of sieve length to width is greater than 4, the sieving efficiency will not increase significantly.
【學(xué)位授予單位】：江西理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD452
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