發(fā)布時(shí)間：2018-05-09 17:00

  本文選題：弧形弛張篩 + 動力學(xué)��； 參考：《太原理工大學(xué)》2015年碩士論文

【摘要】：弛張篩是篩分潮濕、粘性大等難篩細(xì)粒物料的重要設(shè)備，具有篩分效率高、篩孔不易堵塞、噪聲低等優(yōu)點(diǎn)，在近幾十年獲得了很大的發(fā)展。弛張篩的篩面結(jié)構(gòu)與振動特性直接影響篩面上物料的運(yùn)動和透篩，能決定弛張篩篩分效率的高低。因此對弛張篩篩面進(jìn)行的動力學(xué)分析與結(jié)構(gòu)設(shè)計(jì)對于提高弛張篩的篩分效率具有重要的理論意義。 本文首先闡述弛張篩、弧形篩面設(shè)計(jì)和篩分工作等原理，建立弛張篩動力學(xué)模型，推導(dǎo)得到其振動方程和振幅表達(dá)式。分析發(fā)現(xiàn)，，弛張篩的簡諧振動特點(diǎn)使得其位移振幅對弛張篩振動特性影響很大。然后分析影響振幅的各個(gè)參數(shù)，并利用循環(huán)求解法對各個(gè)參數(shù)非線性取值。最后利用ADAMS計(jì)算驗(yàn)證弛張篩前面分析的動力學(xué)特性。 通過研究弛張篩篩面的篩板傳統(tǒng)變形數(shù)學(xué)模型，結(jié)合篩面運(yùn)動的多重運(yùn)動特性：浮動篩框的大幅運(yùn)動、篩箱的小幅運(yùn)動和聚氨酯篩板的大撓度非線性變形運(yùn)動特點(diǎn)，確定使用懸鏈線理論模型模擬篩板變形。然后通過分析懸鏈線的理論推導(dǎo)出篩板變形的撓度曲線表達(dá)式，利用MATLAB計(jì)算得到了篩板變形結(jié)果，再分別與實(shí)驗(yàn)測量結(jié)果和Workbench仿真結(jié)果比較發(fā)現(xiàn)誤差都很小，驗(yàn)證了懸鏈線模型的可行性。最后利用懸鏈線理論推導(dǎo)弧形篩面傾斜篩板的振動特性，以及各主要參數(shù)對篩板振動最大速度和加速度的影響。 結(jié)合篩面振動情況復(fù)雜的情況，分析顆粒在篩面上的受力和顆粒的定常運(yùn)動，推導(dǎo)顆粒運(yùn)動與篩面傾角和斜拋角的關(guān)系。然后分析顆粒在篩面上的理論透篩概率與篩面角度參數(shù)的關(guān)系，再利用概率論設(shè)計(jì)篩分效率的計(jì)算和表達(dá)方法，并推導(dǎo)出滿足理論篩分效率所需的弧形篩面長度。最后對篩面的曲線函數(shù)作了推導(dǎo)和作圖。從而達(dá)到弧形弛張篩篩面動力學(xué)分析和形狀參數(shù)設(shè)計(jì)的目的。
[Abstract]:Relaxation screen is an important equipment for screening fine materials such as moisture and viscosity. It has many advantages such as high screening efficiency, easy blocking of sieve holes, low noise and so on. It has gained great development in recent decades. The structure and vibration characteristics of the relaxation screen directly affect the movement and screening of the material on the screen surface, and can determine the screening efficiency of the relaxation screen. Therefore, the dynamic analysis and structural design of the relaxation screen surface are of great theoretical significance for improving the screening efficiency of the relaxation screen. In this paper, the principles of relaxation screen, curved screen surface design and screening work are introduced, the dynamic model of relaxation screen is established, and the vibration equation and amplitude expression are derived. It is found that the simple harmonic vibration of the relaxation screen makes its displacement amplitude have a great influence on the vibration characteristics of the relaxation screen. Then the parameters affecting the amplitude are analyzed, and the nonlinear values of the parameters are determined by the cyclic solution method. Finally, the dynamic characteristics of the front analysis of the relaxation screen are verified by ADAMS calculation. Through the study of the traditional deformation mathematical model of the relaxation sieve surface, combined with the multiple motion characteristics of the sieve surface motion: the large motion of the floating screen frame, the small motion of the screen box and the characteristics of the large deflection nonlinear deformation of the polyurethane sieve plate. A catenary theoretical model is used to simulate the deformation of sieve plate. Then the deflection curve expression of sieve plate deformation is deduced by analyzing catenary theory, and the result of sieve plate deformation is obtained by MATLAB calculation. Compared with the experimental results and Workbench simulation results, the error is very small. The feasibility of catenary model is verified. Finally, the vibration characteristics of inclined sieve plate with curved sieve surface are deduced by catenary theory, and the influence of main parameters on the maximum velocity and acceleration of vibration of sieve plate is obtained. Combined with the complex vibration of the sieve surface, the force acting on the sieve surface and the steady motion of the particle are analyzed, and the relationship between the particle motion and the inclined angle and oblique angle of the sieve surface is deduced. Then, the relationship between the theoretical screening probability and the angle parameters of the sieve surface is analyzed, and then the calculation and expression method of the sieve efficiency is designed by using probability theory, and the length of the arc screen surface which meets the theoretical screening efficiency is deduced. Finally, the curve function of the screen surface is deduced and drawn. In order to achieve the purpose of dynamic analysis and shape parameter design of curved relaxation screen.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD452

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