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SMC氣缸所設(shè)緩沖裝置種類很多，上述只是其中之一，當(dāng)然也可以在氣動(dòng)回路上采取措施，達(dá)到緩沖目的。 組合組合氣缸一般指氣缸與液壓缸相組合形成的氣-液阻尼缸、氣-液增壓缸等。*，通常氣缸采用的工作介質(zhì)是壓縮空氣，其特點(diǎn)是動(dòng)作快，但速度不易控制，當(dāng)載荷變化較大時(shí)，容易產(chǎn)生“爬行”或“自走”現(xiàn)象；而液壓缸采用的工作介質(zhì)是通常認(rèn)為不可壓縮的液壓油，其特點(diǎn)是動(dòng)作不如氣缸快，但速度易于控制，當(dāng)載荷變化較大時(shí)，采用措施得當(dāng)，一般不會(huì)產(chǎn)生“爬行”和“自走”現(xiàn)象。把氣缸與液壓缸巧妙組合起來(lái)，取長(zhǎng)補(bǔ)短，即成為氣動(dòng)系統(tǒng)中普遍采用的氣-液阻尼缸。氣-液阻尼缸工作原理見(jiàn)圖42.2-5。實(shí)際是氣缸與液壓缸串聯(lián)而成，兩活塞固定在同一活塞桿上。液壓缸不用泵供油，只要充滿油即可，其進(jìn)出口間裝有液壓?jiǎn)蜗蜷y、節(jié)流閥及補(bǔ)油杯。當(dāng)氣缸右端供氣時(shí)，氣缸克服載荷帶動(dòng)液壓缸活塞向左運(yùn)動(dòng)（氣缸左端排氣），此時(shí)液壓缸左端排油，單向閥關(guān)閉，油只能通過(guò)節(jié)流閥流入液壓缸右腔及油杯內(nèi)，這時(shí)若將節(jié)流閥閥口開(kāi)大，則液壓缸左腔排油通暢，兩活塞運(yùn)動(dòng)速度就快，反之，若將節(jié)流閥閥口關(guān)小，液壓缸左腔排油受阻，兩活塞運(yùn)動(dòng)速度會(huì)減慢。這樣，調(diào)節(jié)節(jié)流閥開(kāi)口大小，就能控制活塞的運(yùn)動(dòng)速度?？梢钥闯?，氣液阻尼缸的輸出力應(yīng)是氣缸中壓縮空氣產(chǎn)生的力（推力或拉力）與液壓缸中油的阻尼力之差。

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