發(fā)布時間：2018-05-03 08:03

  本文選題：連續(xù)平壓熱壓機 + 伺服系統(tǒng)　； 參考：《南京林業(yè)大學》2013年碩士論文

【摘要】：人造板生產(chǎn)規(guī)模主要決定于熱壓機，傳統(tǒng)的間歇式壓機已經(jīng)不能滿足人造板生產(chǎn)發(fā)展的需要，連續(xù)壓機以其優(yōu)良的性能逐步取而代之。面對國外技術封鎖的阻礙，本研究將構(gòu)建電液伺服系統(tǒng)，通過對連續(xù)平壓過程中的各區(qū)段熱壓壓力和板坯厚度的精確控制，為我國研發(fā)擁有自主知識產(chǎn)權(quán)的連續(xù)平壓機發(fā)揮一定的作用。 本研究首先介紹連續(xù)平壓機的組成，分析其要完成的工藝任務和需控制的各項參數(shù)，確定了電液伺服系統(tǒng)的以油缸壓力和油缸位移為控制對象，使用電液伺服閥進行調(diào)節(jié)的閉環(huán)控制方案，在此基礎上設計連續(xù)平壓機液壓系統(tǒng)原理圖。文中完成了泵站系統(tǒng)和機架油缸組控制系統(tǒng)各組成部分原理圖的設計，實現(xiàn)了壓力、流量控制，壓板提升下降等功能。 本研究以位置伺服系統(tǒng)為例，建立了位置伺服系統(tǒng)各環(huán)節(jié)的數(shù)學模型，以壓制厚度為12mm的中密度纖維板為基礎設計參數(shù)，得出了位置伺服系統(tǒng)的閉環(huán)傳遞函數(shù)。在數(shù)學模型的基礎上進行系統(tǒng)性能分析和系統(tǒng)校正。文中使用PID控制器進行系統(tǒng)校正，分別使用穩(wěn)定邊界法、Ziegler-Nichols公式、Cohen-Coon公式和誤差積分指標最優(yōu)PID校正設計法對PID參數(shù)進行整定，最終得出使用時間絕對偏差乘積積分最優(yōu)法整定PID參數(shù)后，系統(tǒng)的峰值時間tP0.01s，調(diào)節(jié)時間ts=0.03s，響應速度很快，短時間內(nèi)進入穩(wěn)態(tài)，穩(wěn)態(tài)實際輸出值與期望輸出值一致，超調(diào)量s%=14%，滿足控制要求。 本研究最后使用AMESim軟件進行計算機仿真分析，通過對不同負載情況下系統(tǒng)的仿真結(jié)果的分析，確定了壓機二次加壓區(qū)開始階段和壓機出口處的不同工藝控制方式。通過對同側(cè)油缸控制仿真結(jié)果的分析，顯示在二次加壓開始段，一個伺服閥控制同側(cè)多個油缸可以滿足工藝要求，壓機出口處的幾個機架油缸組的盡量使用一個伺服閥控制一個油缸。通過對一個機架油缸組控制仿真結(jié)果的分析，在排氣段，，可以中間油缸采用壓力控制，左右兩側(cè)油缸采用位置控制，保證板坯橫向厚度尺寸均勻穩(wěn)定。
[Abstract]:The scale of wood-based panel production mainly depends on the hot press. The traditional intermittent press can not meet the needs of the development of wood-based panel production. The continuous press is gradually replaced by its excellent performance. In the face of foreign technical blockage, this study will construct an electro-hydraulic servo system, which can accurately control the hot pressing pressure and slab thickness of each section in the process of continuous flat pressing. For our research and development with independent intellectual property rights of continuous flat press play a certain role. In this study, the composition of the continuous flat press is introduced, and the process tasks and parameters to be controlled are analyzed. The control object of the electro-hydraulic servo system is the cylinder pressure and the displacement of the cylinder. On the basis of the closed-loop control scheme of electro-hydraulic servo valve, the principle diagram of hydraulic system of continuous flat press is designed. In this paper, the design of the schematic diagram of each component of the pump station system and the control system of the oil cylinder group of the frame is completed, and the functions of pressure, flow control and pressure plate lifting and lowering are realized. Taking the position servo system as an example, the mathematical model of each link of the position servo system is established. The closed-loop transfer function of the position servo system is obtained based on the design parameters of the medium density fiberboard (MDF) with the thickness of 12mm. System performance analysis and system correction are carried out on the basis of mathematical model. In this paper, the PID controller is used for system correction, and the stable boundary method is used to calibrate the PID parameters by using the stable boundary method and the Cohen-Coon formula and the optimal PID correction design method of the error integral index, respectively. Finally, after the PID parameters are adjusted by the time absolute deviation product integral optimization method, the peak time of the system is tP0.01s, the adjusting time is 0.03s, the response speed is fast, the steady-state output value is in steady state in a short time, and the actual output value of the steady-state system is in agreement with the expected output value. The overshoot is about 14 to meet the control requirements. At the end of this study, AMESim software is used for computer simulation analysis. Through the analysis of the simulation results of the system under different loads, the different process control methods in the initial stage of the secondary pressurization zone of the press and at the outlet of the press are determined. Through the analysis of the simulation results of the same side cylinder control, it is shown that at the beginning of secondary pressurization, one servo valve can control the same side multiple cylinders to meet the process requirements. Use a servo valve to control a cylinder as much as possible for several rack cylinders at the outlet of the press. Through the analysis of the simulation results of the control of a frame oil cylinder group, the pressure control can be adopted in the middle cylinder and the position control on the left and right sides of the oil cylinder in the exhaust section, which ensures the horizontal thickness of the slab to be uniform and stable.
【學位授予單位】：南京林業(yè)大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TS642

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