發(fā)布時(shí)間：2018-05-03 08:03

  本文選題：連續(xù)平壓熱壓機(jī) + 伺服系統(tǒng)�。� 參考：《南京林業(yè)大學(xué)》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(jī)，傳統(tǒng)的間歇式壓機(jī)已經(jīng)不能滿足人造板生產(chǎn)發(fā)展的需要，連續(xù)壓機(jī)以其優(yōu)良的性能逐步取而代之。面對(duì)國(guó)外技術(shù)封鎖的阻礙，本研究將構(gòu)建電液伺服系統(tǒng)，通過(guò)對(duì)連續(xù)平壓過(guò)程中的各區(qū)段熱壓壓力和板坯厚度的精確控制，為我國(guó)研發(fā)擁有自主知識(shí)產(chǎn)權(quán)的連續(xù)平壓機(jī)發(fā)揮一定的作用。 本研究首先介紹連續(xù)平壓機(jī)的組成，分析其要完成的工藝任務(wù)和需控制的各項(xiàng)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(duì)象，使用電液伺服閥進(jìn)行調(diào)節(jié)的閉環(huán)控制方案，在此基礎(chǔ)上設(shè)計(jì)連續(xù)平壓機(jī)液壓系統(tǒng)原理圖。文中完成了泵站系統(tǒng)和機(jī)架油缸組控制系統(tǒng)各組成部分原理圖的設(shè)計(jì)，實(shí)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(xué)模型，以壓制厚度為12mm的中密度纖維板為基礎(chǔ)設(shè)計(jì)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(xué)模型的基礎(chǔ)上進(jìn)行系統(tǒng)性能分析和系統(tǒng)校正。文中使用PID控制器進(jìn)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(biāo)最優(yōu)PID校正設(shè)計(jì)法對(duì)PID參數(shù)進(jìn)行整定，最終得出使用時(shí)間絕對(duì)偏差乘積積分最優(yōu)法整定PID參數(shù)后，系統(tǒng)的峰值時(shí)間tP0.01s，調(diào)節(jié)時(shí)間ts=0.03s，響應(yīng)速度很快，短時(shí)間內(nèi)進(jìn)入穩(wěn)態(tài)，穩(wěn)態(tài)實(shí)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(jìn)行計(jì)算機(jī)仿真分析，通過(guò)對(duì)不同負(fù)載情況下系統(tǒng)的仿真結(jié)果的分析，確定了壓機(jī)二次加壓區(qū)開(kāi)始階段和壓機(jī)出口處的不同工藝控制方式。通過(guò)對(duì)同側(cè)油缸控制仿真結(jié)果的分析，顯示在二次加壓開(kāi)始段，一個(gè)伺服閥控制同側(cè)多個(gè)油缸可以滿足工藝要求，壓機(jī)出口處的幾個(gè)機(jī)架油缸組的盡量使用一個(gè)伺服閥控制一個(gè)油缸。通過(guò)對(duì)一個(gè)機(jī)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(xué)位授予單位】：南京林業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TS642

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 張揚(yáng);于志明;馬君;;纖維板彈性模量預(yù)測(cè)模型的研究[J];北京林業(yè)大學(xué)學(xué)報(bào);2009年S1期

2 張榮其;;雙鋼帶連續(xù)壓機(jī)的結(jié)構(gòu)、工作原理與計(jì)算[J];中國(guó)人造板;2006年12期

3 陸懷鋒;張榮其;;我國(guó)人造板連續(xù)壓機(jī)的現(xiàn)狀和發(fā)展前景[J];中國(guó)人造板;2007年01期

4 張榮其;羅麗萍;;我國(guó)現(xiàn)有人造板連續(xù)壓機(jī)的調(diào)查與分析[J];中國(guó)人造板;2010年09期

5 姜仁龍;;我國(guó)中密度纖維板壓機(jī)發(fā)展概況[J];中國(guó)人造板;2011年04期

6 衛(wèi)宏;郭曉磊;曹平祥;;人造板連續(xù)平壓機(jī)板坯厚度在線監(jiān)測(cè)技術(shù)的現(xiàn)狀與研究[J];中國(guó)人造板;2011年08期

7 田艷青;徐凱宏;劉喜玲;;中密度纖維板熱壓過(guò)程的工藝仿真建模[J];東北林業(yè)大學(xué)學(xué)報(bào);2010年12期

8 王勁嶺,楊智;時(shí)滯控制系統(tǒng) PID 參數(shù)的整定[J];甘肅工業(yè)大學(xué)學(xué)報(bào);1997年04期

9 俞敏;;我國(guó)中密度纖維板設(shè)備制造行業(yè)的發(fā)展格局[J];中國(guó)人造板;2010年10期

10 張林俊;呂濤;楊道龍;鄒方明;廖俊文;;連續(xù)平壓機(jī)壓制中密度纖維板的剖面密度曲線分析[J];中國(guó)人造板;2012年02期

相關(guān)博士學(xué)位論文 前1條

1 靳寶全;電液位置伺服控制系統(tǒng)的模糊滑�？刂品椒ㄑ芯縖D];太原理工大學(xué);2010年

本文編號(hào)：1837677