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

【摘要】：弛張篩是篩分潮濕、粘性大等難篩細粒物料的重要設備，具有篩分效率高、篩孔不易堵塞、噪聲低等優(yōu)點，在近幾十年獲得了很大的發(fā)展。弛張篩的篩面結構與振動特性直接影響篩面上物料的運動和透篩，能決定弛張篩篩分效率的高低。因此對弛張篩篩面進行的動力學分析與結構設計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、弧形篩面設計和篩分工作等原理，建立弛張篩動力學模型，推導得到其振動方程和振幅表達式。分析發(fā)現(xiàn)，，弛張篩的簡諧振動特點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參數，并利用循環(huán)求解法對各個參數非線性取值。最后利用ADAMS計算驗證弛張篩前面分析的動力學特性。 通過研究弛張篩篩面的篩板傳統(tǒng)變形數學模型，結合篩面運動的多重運動特性：浮動篩框的大幅運動、篩箱的小幅運動和聚氨酯篩板的大撓度非線性變形運動特點，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出篩板變形的撓度曲線表達式，利用MATLAB計算得到了篩板變形結果，再分別與實驗測量結果和Workbench仿真結果比較發(fā)現(xiàn)誤差都很小，驗證了懸鏈線模型的可行性。最后利用懸鏈線理論推導弧形篩面傾斜篩板的振動特性，以及各主要參數對篩板振動最大速度和加速度的影響。 結合篩面振動情況復雜的情況，分析顆粒在篩面上的受力和顆粒的定常運動，推導顆粒運動與篩面傾角和斜拋角的關系。然后分析顆粒在篩面上的理論透篩概率與篩面角度參數的關系，再利用概率論設計篩分效率的計算和表達方法，并推導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作了推導和作圖。從而達到弧形弛張篩篩面動力學分析和形狀參數設計的目的。
[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.
【學位授予單位】：太原理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD452

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