電大液壓氣動(dòng)技術(shù)基礎(chǔ)期末復(fù)習(xí)題及答案參考小抄【電大考試必備-在線瀏覽
2025-08-06 15:14本頁面
【正文】 1） 快速時(shí)：低壓大流量泵 高壓小流量泵 1 同時(shí)向系統(tǒng)供油； 慢速時(shí)：高壓小流量 1 向系統(tǒng)供油，低壓大流量泵 2 卸荷 （ 2） 閥 3 的調(diào)定壓力大于 閥 4 的調(diào)定壓力 四、分析題 ， 試分析 液壓系統(tǒng)會(huì)產(chǎn)生什么問題 產(chǎn)生卸荷現(xiàn)象，系統(tǒng)壓力近乎零。 （ 1）試分析活塞空載運(yùn)動(dòng)時(shí) A、 B 兩點(diǎn)的壓力各為多少？減壓閥的閥芯處于什么狀態(tài)？ （ 2）工件夾緊，活塞停止運(yùn)動(dòng)后， A、 B 兩點(diǎn)的壓力又各為多少？此時(shí)，減壓閥芯又處于什么狀態(tài)？ 答： （ 1）活塞空載運(yùn)動(dòng)，由于沒有負(fù)載力作用，系統(tǒng)工作壓力為 0，不考慮沿程阻力損失， A、B 兩點(diǎn)壓力相等，都是 0MPa，此時(shí)減壓閥處在非工作狀態(tài)，閥口常開 （ 2）工件夾緊后，溢流閥工作，此時(shí) A 點(diǎn)壓力為溢流閥調(diào)定壓力， 3MPa，減壓閥也開始工作， B 點(diǎn)壓力為 2MPa，減壓閥閥芯處于半開狀態(tài)，保證出口壓力恒定在 2MPa。油缸兩腔的作用力相等，則有： P2+F=106 即有： P2＝ 106+ F/ 當(dāng) F＝ 2104N 時(shí)， P2＝ 106Pa 當(dāng) F＝ 0 時(shí)， P2＝ 106Pa 當(dāng) F＝ 5104N 時(shí)， P2＝ 106Pa 2．已知液壓泵轉(zhuǎn)速為 1000r/min， 排量為 160ml/r，額定壓力為 30Mpa，實(shí)際輸出流量為 150L/min，泵的總效率為 ，求： ⑴ 泵的理論流量； ⑵ 泵的容積效率和機(jī)械效率； ⑶ 驅(qū)動(dòng)液壓泵所需 的電動(dòng)機(jī)功率。根據(jù)此回路 工作原理，填寫電磁鐵動(dòng)作表。s 10 mustsee animations】 The Chinese animation industry has seen considerable growth in the last several years. It went through a golden age in the late 1970s and 1980s when successively brilliant animation work was produced. Here are 10 mustsee classics from China39。s recall these colorful images that brought the country great joy. Calabash Brothers Calabash Brothers (Chinese: 葫蘆娃 ) is a Chinese animation TV series produced by Shanghai Animation Film Studio. In the 1980s the series was one of the most popular animations in China. It was released at a point when the Chinese animation industry was in a relatively downed state pared to the rest of the international munity. Still, the series was translated into 7 different languages. The episodes were produced with a vast amount of papercut animations. Black Cat Detective Black Cat Detective (Chinese: 黑貓警長(zhǎng) ) is a Chinese animation television series produced by the Shanghai Animation Film Studio. It is sometimes known as Mr. Black. The series was originally aired from 1984 to 1987. In June 2021, a rebroadcasting of the original series was announced. Critics bemoan the series39。s education. Proponents of the show claim that it is merely for entertainment. Effendi Effendi, meaning sir and teacher in Turkish, is the respectful name for people who own wisdom and knowledge. The he
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