德國(guó)P+F倍加福傳感器年底*
近開(kāi)關(guān)是一種毋需與運(yùn)動(dòng)部件進(jìn)行機(jī)械接觸而可以操作的位置開(kāi)關(guān)，當(dāng)物體接近開(kāi)關(guān)的感應(yīng)面到動(dòng)作距離時(shí)，不需要機(jī)械接觸及施加任何壓力即可使開(kāi)關(guān)動(dòng)作，從而驅(qū)動(dòng)交流或直流電器或給計(jì)算機(jī)裝置提供控制指令。接近開(kāi)關(guān)是種開(kāi)關(guān)型傳感器（即無(wú)無(wú)觸點(diǎn)開(kāi)關(guān)），它即有行程開(kāi)關(guān)、微動(dòng)開(kāi)關(guān)的特性，同時(shí)具有傳感性能，且動(dòng)作可靠，性能穩(wěn)定，頻率響應(yīng)快，應(yīng)用壽命長(zhǎng)，抗干擾能力強(qiáng)等、并具有防水、防震、耐腐蝕等特點(diǎn)。產(chǎn)品有電感式、電容式、霍爾式、交、直流型。
4.1.接近開(kāi)關(guān)的選型
對(duì)于不同的材質(zhì)的檢測(cè)體和不同的檢測(cè)距離，應(yīng)選用不同類(lèi)型的接近開(kāi)關(guān)，以使其在系統(tǒng)中具有高的性能價(jià)格比，為此在選型中應(yīng)遵循以下原則：
4.1.1.當(dāng)檢測(cè)體為金屬材料時(shí)，應(yīng)選用高頻振蕩型接近開(kāi)關(guān)，該類(lèi)型接近開(kāi)關(guān)對(duì)鐵鎳、A3鋼類(lèi)檢測(cè)體檢測(cè)zui靈敏。對(duì)鋁、黃銅和不銹鋼類(lèi)檢測(cè)體，其檢測(cè)靈敏度就低。
4.1.2.當(dāng)檢測(cè)體為非金屬材料時(shí)，如；木材、紙張、塑料、玻璃和水等，應(yīng)選用電容型接近開(kāi)關(guān)。
4.1.3.金屬體和非金屬要進(jìn)行遠(yuǎn)距離檢測(cè)和控制時(shí)，應(yīng)選用光電型接近開(kāi)關(guān)或超聲波型接近開(kāi)關(guān)。
4.1.4.對(duì)于檢測(cè)體為金屬時(shí)，若檢測(cè)靈敏度要求不高時(shí)，可選用價(jià)格低廉的磁性接近開(kāi)關(guān)或霍爾式接近開(kāi)關(guān)。
4.2.接近開(kāi)關(guān)技術(shù)指標(biāo)檢測(cè)
4.2.1.動(dòng)作距離測(cè)定；當(dāng)動(dòng)作片由正面靠近接近開(kāi)關(guān)的感應(yīng)面時(shí)，使接近開(kāi)關(guān)動(dòng)作的距離為接近開(kāi)關(guān)的zui大動(dòng)作距離，測(cè)得的數(shù)據(jù)應(yīng)在產(chǎn)品的參數(shù)范圍內(nèi)。
4.2.2.釋放距離的測(cè)定；當(dāng)動(dòng)作片由正面離開(kāi)接近開(kāi)關(guān)的感應(yīng)面，開(kāi)關(guān)由動(dòng)作轉(zhuǎn)為釋放時(shí)，測(cè)定動(dòng)作片離開(kāi)感應(yīng)面的zui大距離。
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德國(guó)P+F倍加福傳感器年底*
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德國(guó)P+F倍加福傳感器年底*