【正文】 (4) to check whether all the appropriate size pipeline, connecting is correct. To use the system to electrohydraulic servo valves, servo valve flushing board to make the flow of oil from the pipeline supplying fuelflow, and return directly to the fuel tank (that is, the control Circuit cleaning), this will give oil repeatedly Circulation, to washing systems, filters filter out solid particles, in the washing process, to the oil for testing to prevent the filter pollutants were blocked, this time not to open the bypass, if there are problems found oil grades, The timely replacement of filters. 2, hydraulic ponents, parts cleaning: maintenance of the hydraulic assembly ago, the old hydraulic parts to be contaminated after all must be cleaned before use, the process of cleaning should do the following: (1), the dismantling of hydraulic, cleaning should meet the standard, an absolute prohibition in the open, shacks, debris or deposition in the warehouse and assembly of hydraulic parts。 (2), the settops for a board to replace the sophisticated irrigation valves, such as the electrohydraulic servo valve。YR Position Control of An Electro Hydraulic ServoCylinder, Vibration, Control Engineering, Engineering of Industry, 1991，34 (3)： 370376.[21] Fitch, E. C., I. T. Hong, “Computerized Hydraulic System Design and Analysis,” BarDyne, Inc., 1996.[22] Fu K S. Learning Control SystemReview and Outlook. IEEE Trans. . 外文資料 How to ensure that the normal functioning of the hydraulic systemWith the continuous development of science and technology, industrial production increased degree of automation, hydraulic and mechanical control as a professional in an independent disciplines also need to continue with the development and updating. Hyundai Heavy Industries in the hydraulic equipment widely used in largescale production lines and special operations equipment is particularly reflected in the full, hydraulic transmission technology has its unparalleled advantages, this is it to be the main reason for the rapid development, but with this At the same time, hydraulic transmission equipment has its vulnerable side, which is a prominent antipollution low capacity weaknesses, according to the information recorded, hydraulic failure 70% to 80% by the oil pollution caused. To ensure the normal hydraulic system, reliable operation, we must keep the system clean. On the proper use and maintenance of the hydraulic system to ensure that the clean oil is daytoday maintenance of equipment and use of an important work. The hydraulic system of pollution control throughout the hydraulic system for the design, manufacture, installation, use and maintenance of the entire process, the basic content and purpose primarily through pollution prevention and control measures, allowing the system to maintain the degree of pollution in the system of key Pressure ponents within the tolerance of pollution, to achieve a reasonable balance to ensure that the work of the hydraulic system reliability and service life of ponents. The hydraulic system of pollutants equivalent to the total pollutants out the existing system with less invasive system to eliminate pollutants out of pollutants Thus, the hydraulic system of the Oil Pollution Control There are two main measures: First, to prevent pollutants invasive system, two of the oil filter purification system. First, oil pollution on the main hazards are as follows: 1. Wear ponents of the oil pollution of all kinds of pollutants from various forms of wear ponents, solid particles into the gap in the movement of the surface of cutting parts wear or fatigue wear. Highspeed flow of solid particles on the surface ponents of the impact caused erosion. Oil in water and oil degeneration of oxide product ponents to the corrosive effect. In addition, the oil gas in the air caused erosion, leading to erosion and destruction of the surface ponents. 2. Plug the card ponents and solid particles bear failure of the hydraulic valve plug the gaps and holes, and obstruction caused spool cards bear, affecting work performance, or even lead to serious accidents. 3. Oil accelerated the deterioration of oil in the water and air for its thermal oxide is the main condition for oil and oil in the oil on the metal oxide particles play an important catalytic role, in addition, oil suspended in water and bubbles Significantly reduce the movement of the strength of Film, lubricating properties decreased. Second, the source of pollutants: Oil system in the way the source of major pollutants in the following areas: Invasion of pollutants: external invasion is the main pollutants in the atmosphere sand or dust, often pore through the fuel tank, the fuel tank of the shaft closures, pumps and motors, and other invasive system the shaft. Is the use of environmental impact. Internal pollutants: ponents in the processing, assembly, testing, packaging, storage, transportation and installation, and other aspects of the residue of pollutants, of course, these processes can not be avoided, but can be reduced to a minimum, some special ponents in the assembly and debugging The need to clean room or clean Taiwan39。我在這期間學(xué)到很豐富的知識(shí)和經(jīng)驗(yàn)，培養(yǎng)了良好的生活作風(fēng)。在此也表示衷心的感謝。卜老師專業(yè)知識(shí)淵博，治學(xué)態(tài)度嚴(yán)謹(jǐn)，精益求精的工作作風(fēng)，誨人不倦的高尚師德，嚴(yán)以律己、寬以待人的崇高風(fēng)范，對(duì)我產(chǎn)生了深遠(yuǎn)的影響。謝辭經(jīng)過(guò)12周的，本次設(shè)計(jì)和論文能圓滿完成。針對(duì)振動(dòng)臺(tái)動(dòng)、靜態(tài)流量變化過(guò)大的問(wèn)題，系統(tǒng)采用了大、小流量?jī)蓚€(gè)伺服閥的全新結(jié)構(gòu)，動(dòng)態(tài)試驗(yàn)時(shí)打開(kāi)大流量伺服閥、靜態(tài)試驗(yàn)時(shí)打開(kāi)小流量伺服閥，從而有效的解決了這個(gè)難題，為有類似問(wèn)題的系統(tǒng)提供了參考。液壓阻尼器試驗(yàn)臺(tái)作為檢驗(yàn)液壓阻尼器的重要試驗(yàn)設(shè)備有著極其重要的作用。偏差信號(hào)經(jīng)過(guò)整流、放大后輸入伺服閥的控制端，控制伺服閥產(chǎn)生旨在減小偏差信號(hào)的運(yùn)動(dòng)，從而使系統(tǒng)的位置與指令信號(hào)期望的位置趨于一致。差動(dòng)式位移傳感器和激振器的活塞軸的運(yùn)動(dòng)同步，將位移信號(hào)轉(zhuǎn)換成電信號(hào)。差動(dòng)變壓式位移傳感器（LVDT）是基于變壓器原理的一種高精度的位移傳感器。在本系統(tǒng)中，使用的傳感器包括位移傳感器（差動(dòng)變壓式位移傳感器）、力傳感器（拉壓力）、液壓油壓力傳感器（監(jiān)測(cè)系統(tǒng)壓力）、溫度傳感器（監(jiān)測(cè)油溫）等多種傳感器。當(dāng)發(fā)現(xiàn)濾油器堵塞后，停機(jī)后更換濾芯。油箱液位控制與安全保護(hù)當(dāng)油箱中液位高度高于或低于高低液位計(jì)的設(shè)定值，泵電機(jī)停止工作，操作面板上指示燈亮，并發(fā)出報(bào)警信號(hào)，泵組停止工作。當(dāng)溫度在設(shè)定值區(qū)間時(shí)，水閥打開(kāi)進(jìn)行油液冷卻，當(dāng)油溫低于設(shè)定值時(shí)關(guān)閉水閥，如果溫度升高到60度。靜態(tài)試驗(yàn)時(shí)，三個(gè)液壓換向閥都不得電；動(dòng)態(tài)試驗(yàn)時(shí)，三個(gè)液壓換向閥都得電。動(dòng)靜態(tài)試驗(yàn)油路切換控制動(dòng)靜態(tài)試驗(yàn)通過(guò)一個(gè)電液換向閥、兩個(gè)電磁換向閥和4個(gè)液控單向閥的切換來(lái)完成。當(dāng)液壓系統(tǒng)壓力異常時(shí)，電控能進(jìn)行保護(hù)和顯示。系統(tǒng)壓力控制與安全保護(hù)液壓系統(tǒng)壓力通過(guò)比例溢流閥進(jìn)行調(diào)節(jié)。油泵電機(jī)安全保護(hù)