【正文】
負(fù)負(fù)載。 其在液壓系統(tǒng)中的位置是 。) ( ) 與機械傳動相比,液壓傳動的優(yōu)點是可以得到嚴(yán)格的傳動比。 ( ) 普通液壓油屬于石油型液壓油。 ( ) 根據(jù)實驗結(jié)果而推薦的可 連續(xù)使用的最高壓力為泵的額定輸出壓力。 ( ) 1 減壓閥的主要作用是使的出口壓力低于進(jìn)口壓力且保證進(jìn)口壓力穩(wěn)定。 ( ) 1 單向閥用作背壓閥時,應(yīng)將其彈簧更換成軟彈簧。 ( ) 2 為提高泵的自吸能力 , 應(yīng)使泵吸油口的真空度盡可能大。 ( ) 2雙作用葉片泵可為變量泵。 A、向上的壓力大于向下的壓力; B、向下的壓力大于向上的壓力; C、各個方向的壓力都相等。 A、流速; B、壓力; C 、流量; D、功率。 A、 節(jié)流閥; B、溢流閥; C、順序閥; D、換向閥。 A、液壓泵; B、液壓缸; C、各種閥; D、油箱。 1 泵常用的壓力有 : A 泵的輸出壓力、 B 泵的最高壓力、 C 泵的額定壓力 , 對一個泵 ,試比較上述三種壓力在數(shù)值上大小的關(guān)系:( )。 A、 “M”型; B、 “Y”型; C、 “P”型; D、 “O”型。 A. 絕對壓力 B. 相對壓力 C. 真亮度 D. 大氣壓 1流量控制閥是用來控制液壓系統(tǒng)工作的流量,從而控制執(zhí)行元件的( )。 1拖動液壓泵的電機功率應(yīng)比液壓泵的輸出功率( )。 空氣壓縮機是氣壓傳動系統(tǒng)的( )。 A、 背壓閥 B、 平衡閥 C、 背壓閥和平衡閥 D、 平衡和單向閥 以下四個圖中溢流閥分別用于( ) A、 溢流、安全、背壓和遠(yuǎn)程調(diào)壓; B、 安全、溢流、遠(yuǎn)程調(diào)壓和背壓; C、 遠(yuǎn)程調(diào)壓、溢流、背壓和安全; D、 遠(yuǎn)程調(diào)壓、安全、背壓和溢流。 C、 快進(jìn)、一工進(jìn)、二工進(jìn)和快退。 圖中基本回路為( )級調(diào)壓回路。 液壓傳動中的控制閥,可分為 控制閥, 控制閥和 控制閥。 其中 可承受負(fù)負(fù)載。 (10 分 ) 一、 填空題(共 20 分,每空 1 分) 常用的液壓基本回路有 ____________, ____________, ____________和 ____________。 在液壓傳動中,將壓力能轉(zhuǎn)換為驅(qū)動工作部件機械能的能量轉(zhuǎn)換元件是 ____________。 氣壓傳動系統(tǒng)中,動力元件是 __________,執(zhí)行元件是 ____________,控制元件是____________。 ( ) 在液壓傳動中,人們利用液體來傳遞動力和運動。 ( ) 將單桿活塞式液壓缸的左右兩腔接通,同時引入壓力油,可使活塞獲得快速運動。 ( ) 如果不考慮液壓缸的泄漏,液壓缸的運動速度只決定于進(jìn)入液壓缸的流量。 ( ) 1當(dāng)液壓缸的截面積一定時,活塞的運動速度取決于進(jìn)入液壓缸的液體的壓力。 ( ) 氣動馬達(dá)是將壓縮空氣的壓力能轉(zhuǎn)換成直線運動的機械能的裝置。 液壓缸差動連接時,缸的( )。 缸體固定的液壓缸,活塞運動速度與( )成正比。 檢修液壓設(shè)備時,當(dāng)發(fā)現(xiàn)油箱中油液呈乳白色,這主要是由于油中混入( )造成的。 為防止立式安裝的執(zhí)行元件及和它連在一起的負(fù)載因自重而下滑,常采用( )。 1氣壓傳動中方向控制閥是用來( )。 1壓縮空氣站是氣壓系統(tǒng)的( )。s animation outpouring that are not to be missed. Let39。s real name was Nasreddin. He was wise and witty and, more importantly, he had the courage to resist the exploitation of noblemen. He was also full of passion and tried his best to help poor people. Adventure of Shuke and Beita【舒克與貝塔】 Adventure of Shuke and Beita (Chinese: 舒克和貝塔 ) is a classic animation by Zheng Yuanjie, who is known as King of Fairy Tales in China. Shuke and Beita are two mice who don39。s natural scenery. Pleasant Goat and Big Big Wolf【喜洋洋與灰太狼】 Pleasant Goat and Big Big Wolf (Chinese:喜羊羊與灰 太狼 ) is a Chinese animated television series. The show is about a group of goats living on the Green Pasture, and the story revolves around a clumsy wolf who wants to eat them. It is a popular domestic animation series and has been adapted into movies. Nezha Conquers the Dragon King( Chinese: 哪吒鬧海) is an outstanding animation issued by the Ministry of Culture in 1979 and is based on an episode from the Chinese mythological novel Fengshen Yanyi. A mother gave birth to a ball of flesh shaped like a lotus bud. The father, Li Jing, chopped open the ball, and beautiful boy, Nezha, sprung out. One day, when Nezha was seven years old, he went to the nearby seashore for a swim and killed the third son of the Dragon King who was persecuting local residents. The story primarily revolves around the Dragon King39。s Film Festival Award in 1989. McDull【麥兜】 McDull is a cartoon pig character that was created in Hong Kong by Alice Mak and Brian Tse. Although McDull made his first appearances as a supporting character in the McMug ics, McDull has since bee a central character in his own right, attracting a huge following in Hong Kong. The first McDull movie McMug Story My Life as McDull documented his life and the relationship between him and his McMug Story My Life as McDull is also being translated into French and shown in France. In this version, Mak Bing is the mother of McDull, not his father..