【正文】
ratio control valve. Auxiliary ponents, including fuel tanks, oil filters, tubing and pipe joints, seals, pressure gauge, oil level, such as oil dollars. 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. Hydraulic principle It consists of two cylinders of different sizes and position of fluid in the fluid full of water or oil. Water is called hydraulic press。 本文摘自《《》》 4 What is Hydraulic? A plete hydraulic system consists of five parts, namely, power pone nts, the implementation of ponents, control ponents, no parts and hydraulic oil. The role of dynamic ponents of the original motive fluid into mechanical energy to the pressure that the hydraulic system of pumps, it is to power the entire hydraulic system. The structure of the form of hydraulic pump gears are generally pump, vane pump and piston pump. 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. 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 valves can be divided into the village of force control valve, 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.。在齒輪泵出口處的壓力脈動可以控制在 1%以內(nèi)。與泵體內(nèi)加熱方式不同,這些元件的損壞只限于一個(gè)板子上 ,與整個(gè)泵無關(guān)。為便于安裝,制造商設(shè)計(jì)了一個(gè)環(huán)形螺栓安裝面,以使與其它設(shè)備的法蘭安裝相配合,這使得筒形法蘭的制造更容易。這種密封實(shí)際上并不接觸軸的表面,它的密封原理是將聚合物冷卻到半熔融狀態(tài)而形成自密封。精密加工的泵體可使 “D”型軸承與齒輪軸精確配合, 確保齒輪軸不偏心,以防齒輪磨損。 “D”型軸承結(jié)合了強(qiáng)制潤滑機(jī)理,使聚合物經(jīng)軸承表面,并返回到泵的進(jìn)口側(cè),以確保旋轉(zhuǎn)軸的有效潤滑。這些泵將與具體的應(yīng)用工藝相配合,以使系統(tǒng)能力及價(jià)格達(dá)到最優(yōu)。 推動高粘流體進(jìn)入吸入口一側(cè)的兩齒空間是非常重要的,如果這一空間 沒有填充滿,則泵就不能排出準(zhǔn)確的流量,所以 PV 值 (壓力 流速 )也是另外一個(gè)限制因素,而且是一個(gè)工藝變量。如果這個(gè)阻尼器在工作中變化,亦即如果濾網(wǎng)變臟、堵塞了,或限制器的背壓升高了,則泵仍將 3 保持恒定的流量,直至達(dá)到裝置中最弱的部件的機(jī)械極限 (通常裝有一個(gè)扭矩限制器 )。 對于粘度或密度在工 藝中有變化的流體,這種泵不會受到太多影響。 實(shí)際上,在泵內(nèi)有很少量的流體損失,這使泵的運(yùn)行效率不能達(dá)到 100%,因?yàn)檫@些流體被用來潤滑軸承及齒輪兩側(cè),而泵體也絕不可能無間隙配合,故不能使流體 100%地從出口排出,所以少量的流體損失是必然的。隨著驅(qū)動軸的不間斷地旋轉(zhuǎn),泵也就不間斷地排出流體。因?yàn)橐后w是不可壓縮的,所以液體和齒就不能在同一時(shí)間占據(jù)同一空間 ,這樣,液體就被排除了。來自于擠出機(jī)的物料在吸入口進(jìn)入兩個(gè)齒輪中間,并充滿這一空間,隨著齒的旋轉(zhuǎn)沿殼體運(yùn)動,最后在兩齒嚙合時(shí)排出。業(yè)用的塑料加工機(jī)械、壓力機(jī)械、機(jī)床等;行走機(jī)械中的工程機(jī)械、建筑機(jī)械、農(nóng)業(yè)機(jī)械、汽車等;鋼鐵工業(yè)用的冶金機(jī)械、提升裝置、軋輥調(diào)整裝置等;土木水利工程用的防洪閘門及堤壩裝置、河床升降裝置、橋梁操縱機(jī)構(gòu)等;發(fā)電廠渦輪機(jī)調(diào)速裝置、核發(fā)電廠等等;船舶用的甲板起重機(jī)械(絞車)、船頭門、艙壁閥、船尾推進(jìn)器等;特殊技術(shù)用的巨型天線控制裝置、測量浮標(biāo)、升降旋轉(zhuǎn)舞臺等;軍事工業(yè)用的火炮操縱裝置、船舶減搖裝置、飛行器仿真、飛機(jī) 起落架的收放裝置和方向舵控制裝置等。近 20~30 年間 ,日本液壓傳動發(fā)展之快,居世界領(lǐng)先地位。應(yīng)該指出 ,日本液壓傳動的發(fā)展較歐美等國家晚了近 20 多年。1910 年對液力傳動 (液力聯(lián)軸節(jié)、液力變矩器等 )方面的貢獻(xiàn),使這兩方面領(lǐng)域得到了發(fā)展。1925 年維克斯 ()發(fā)明了壓力平衡式葉片泵 ,為近代液壓元件工業(yè)或液壓傳動 的逐步建立奠定了基礎(chǔ)