【正文】 tem will cause a sharp drop in volumetric efficiency, amounting to less than the required pressure, can not even work. Microinvasive system of dust particles, can cause or exacerbate friction hydraulic ponent wear, and further lead to leakage. 在液壓系統(tǒng)及其系統(tǒng)中，密封裝置用來(lái)防止工作介質(zhì)的泄漏及外界灰塵和異物的侵入。 很容易實(shí)現(xiàn)機(jī)器的自動(dòng)化，當(dāng)采用電液聯(lián)合控制后，不僅可實(shí)現(xiàn)更高程度的自動(dòng)控制過(guò)程，而且可以實(shí)現(xiàn)遙控 。如果整個(gè)系統(tǒng)僅有一種設(shè)備，則可省略設(shè)備編號(hào)。 空心箭頭表示信號(hào)流，而實(shí)心箭頭則表示能量流。 The role of the hydraulic system is to help humanity work. Mainly by the implementation of ponents to rotate or pressure into a reciprocating motion. 液壓系統(tǒng)的作用就是幫助人類(lèi)做工。 Control ponents (that is, the various hydraulic valves) in the hydraulic system to control and regulate the pressure of liquid, flow rate and direction. According to the different control functions, hydraulic pressure control valve can be divided into valves, flow control valves and directional control valve. Pressure control valves are divided into benefits flow valve (safety valve), pressure relief valve, sequence valve, pressure relays, etc.。 speed turbine power plant installations, nuclear power plants, etc.。s fast hydraulic transmission, a world leader. 第二次世界大戰(zhàn) (19411945)期間 ,在美國(guó)機(jī)床中有 30%應(yīng)用了液壓傳動(dòng)。 After the World War I (19141918) ,because of the extensive application of hydraulic transmission, espec ially after 1920, more rapid development. Hydraulic ponents in the late 19th century about the early 20th century, 20 years, only started to enter the formal phase of industrial production. 1925 Vickers (F. Vikers) the invention of the pressure balanced vane pump, hydraulic ponents for the modern industrial or hydraulic transmission of the gradual establishment of the foundation. The early 20th century G ? Constantimscofluct uations of the energy carried out by passing theoretical and practical research。 1905年將工作介質(zhì)水改為油，又進(jìn)一步得到改善。s hydraulic drive, set up in 1956, Hydraulic Industry. Nearly 20 to 30 years, the development of Japan39。 civil water projects with flo od control and dam gate devices, bed lifts installations, bridges and other manipulation of institutions。 Implementation of ponents (such as hydraulic cylinders and hydraulic motors) which is the pressure of the liquid can be converted to mechanical energy to drive the load for a straight line reciprocating movement or rotational movement. 執(zhí)行元件 (如液壓缸和液壓馬達(dá) )的作用是將液體的壓力能轉(zhuǎn)換為機(jī)械能，驅(qū)動(dòng)負(fù)載作直線往復(fù)運(yùn)動(dòng)或回轉(zhuǎn)運(yùn)動(dòng)。 Hydraulic oil in the hydraulic system is the work of the energy transfer medium, there are a variety of mineral oil, emulsion oil hydraulic molding Hop categories. 液壓油是液壓系統(tǒng)中傳遞能量的工作介質(zhì)，有各種礦物油、乳化液和合成型液壓油等幾大類(lèi)。 In the analysis and design of the actual task, the general block diagram shows the actual operation of equi pment. Hollow arrow indicates the signal flow, while the solid arrows that energy flow. 在分析和設(shè)計(jì)實(shí)際任務(wù)時(shí)，一般采用方框圖顯示設(shè)備中實(shí)際運(yùn)行狀況。 DIN ISO12192 standard definition of the number of ponent position, which includes the following four parts: device ID, circuit ID, ponent ID and ponent ID. The entire system if only one device, device number may be omitted. DIN ISO12192 標(biāo)準(zhǔn)定義了元件的編號(hào)組成，其包括下面四個(gè)部分：設(shè)備編號(hào)、回路編號(hào)、元件標(biāo)識(shí)符和元件編號(hào)。 一般采用礦物油作為工作介質(zhì)，相對(duì)運(yùn)動(dòng)面可自行潤(rùn)滑，使用壽命長(zhǎng)； 6, it is easy to achieve linear motion / 很容易實(shí)現(xiàn)直線運(yùn)動(dòng) / 7, it is easy to achieve the automation of machines, when the joint control of the use of electrohydraulic, not only can achieve a higher degree of process automation, and remote control can be achieved。 the use and maintenance requirements for a higher level of technology. 液壓傳動(dòng)出故障時(shí)不易找出原因；使用和維修要求有較高的技術(shù)水平。除間隙密封外，都是利用密封件，使相鄰兩個(gè)偶合表面間的間隙控制在需要密封的液體能通過(guò)的最小間隙以下。由于液壓油在管路中的高速流動(dòng)而產(chǎn)生的沖擊以及控制閥打開(kāi)關(guān)閉過(guò)程中產(chǎn)生的沖擊都是系統(tǒng)發(fā)生振動(dòng)的原因。外泄漏是指發(fā)生在系統(tǒng)和外部環(huán)境之間的泄漏。 the development of highly integrated high power density, intelligence, mechatronics and microlight minihydraulic ponents。 (1) used highpressure hydraulic ponents and the pressure of continuous work to reach 40Mpa, the maximum pressure to achieve instant 48M