Study Of The Reed Cleaning And Crushing High Density Baling Equipment And The Analysis And Simulation Of Key Mechanism

Due to the situation that low reed density cause low economic benefit for the conveying deficiency,China has rich reed resources but low utilization ratio. So the rheological law and compression properties of reed are researched in second order to increase the packing density and economic benefit. By analyzing the influence factors of stress relaxation characteristics under high density compression, the weight coefficient of each factor is determined and the mathematical equation of the stress relaxation characteristic of reed is constructed. After that, a simulation is carried out to test and verify. A kind of equipment integrating the functions of the reed crushing and cleaning is proposed. Based on multi body dynamics theory, mechanical systems of multi rigid body model and rigid flexible hybrid model are constructed.Comparative analysis of displacement, velocity, trajectory and stress on the critical position show the motion law and dynamic characteristics. According to the finite element theory, the natural frequency and vibration mode is obtained and the vibration characteristics are verified in the modal and harmonic response analysis of the key components in the compression packing mechanism. The details are as follows:1)Based on the reed compression characteristics research, this paper makes experimental study on the stress relaxation characteristics, using single factor rotation method to explore the reed compression rules and stress relaxation properties in the water rate of 13%, 15%, 17% and initial feeding amount 450 g, 500 g,550G. The maximum stress relaxation model expression isx.ey38022558-? with the correlation coefficient R2= 0.998 when the water rate is 13%, and feed quantity is 550 g. Utilizing the expression, the relaxation prototype model are established and the curve is drawn to reveal the relaxation law.2)To solve the main problem that current packing machine faces and considering the reed material properties, the integrated plan of reed packing equipment with crushing device, cleaning device and bundling device is proposed. Some of the key components are designed and modeled. The calculated eccentricity, crank and connecting rod length are 130 mm, 273 mm and 1048.5mm respectively, and the minimum transmission angle is 67.4degrees.3)For the vibration problems of packing equipment when working, the modal and harmonic response analysis of compressed packing mechanism and key parts are done, then it is figured out that resonance phenomenon generates easily in 100.81 Hz, 126.11 Hz, 254.6Hz, and the maximum harmonic peak turns out in the fourth stage and fifth stage.4) Through the multi rigid body system dynamics simulation of the feeding compressed packing mechanism, the maximum stress value in the Y direction of the crank and the spindle is 1000 N, the force of the connecting rod and the crank and the compression piston joint are respectively 352 N, 122 N. And the shifting fork crank hinged fork shaft at the X, Y reached the maximum force 1500 N and 700 N.5)Crude fiber compressed packing mechanism’s multi rigid body model and rigid flexible hybrid model are co-established with ANSYS and ADAMS, and both of them are simulated and analyzed. The displacement, velocity and force curve at the joint of crank and connecting rod, the connecting rod and the piston between different models are compared. The results show that the motion law is different from the rigid flexible hybrid model to the multi rigid body model in the initial motion or intermediate moment because of the flexible body deforming in the rigid flexible hybrid model.In summary, on the relaxation properties of reed and crushing cleaning high density baling equipment has important significance.