4WRZ25E220-7X/6EG24N9ETK4/D3M力士樂比例閥

4WRZ25E220-7X/6EG24N9ETK4/D3M

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4WRZ25E220-7X/6EG24N9ETK4/D3M
　手柄行程越大,對(duì)應(yīng)的二次先導(dǎo)壓力也會(huì)越大,由二次先導(dǎo)壓力控制的主閥芯的開啟度也會(huì)越大, 與之對(duì)應(yīng), 主閥芯的開啟度越大,主油路分向執(zhí)行元件的油越多,執(zhí)行元件的速度就會(huì)越快,通過中位流經(jīng)負(fù)壓信號(hào)發(fā)生裝置的油越少,負(fù)壓信號(hào)的壓力值就會(huì)越小;反之如果手柄行程越小,對(duì)應(yīng)的二次先導(dǎo)壓力也會(huì)越小,由二次先導(dǎo)壓力控制的主閥芯的開啟度也會(huì)越小, 與之對(duì)應(yīng), 主閥芯的開啟度越小,主油路分向執(zhí)行元件的油越少,執(zhí)行元件的速度就會(huì)越慢, 通過中位流經(jīng)負(fù)壓信號(hào)發(fā)生裝置的油就越多,負(fù)壓信號(hào)的壓力值就會(huì)越大.液壓泵根據(jù)負(fù)壓信號(hào)的壓力值的大小來對(duì)其排量進(jìn)行控制.這就是負(fù)流量控制.他的信號(hào)采集點(diǎn)是主油路中主控制閥的出口處
　　什么是正流量控制系統(tǒng)?
　　正流量控制系統(tǒng)，是力士樂上世紀(jì)80年代的技術(shù)，主要特點(diǎn)是：操縱手柄的先導(dǎo)壓力不僅控制換向閥，還用來調(diào)節(jié)油泵的排量。執(zhí)行元件不工作的時(shí)候，油泵上沒有先導(dǎo)壓力，斜盤擺角小，油泵只輸出少量的備用流量。操縱先導(dǎo)手柄，則液壓先導(dǎo)回路中建立起與手柄偏轉(zhuǎn)量成比例的壓力來控制換向閥閥芯的位移和泵的排量。油泵的流量和由此產(chǎn)生的執(zhí)行元件的工作速度與先導(dǎo)壓力-控制壓力成正比例。在正流量的主控制閥上沒有負(fù)壓信號(hào)發(fā)生裝置,他的信號(hào)采集于二次先導(dǎo).其它部分與負(fù)流量沒有什么區(qū)別.
　　與負(fù)流量相比正流量為什么操作敏感性好?
　　由于負(fù)壓控制的信號(hào)采集點(diǎn)在主挖掘閥的出口處,只有主控制閥有動(dòng)作時(shí)此負(fù)壓信號(hào)才會(huì)發(fā)生變化,從而使泵的排量發(fā)生變化,這就使得液壓泵的控制永遠(yuǎn)滯后于主控制閥的控制.
　　而在正流量中,由于泵的控制信號(hào)采集于二次先導(dǎo)壓力,此壓力信號(hào)同時(shí)發(fā)送液壓泵和主控制閥,這就是使的兩者的動(dòng)作可以同步進(jìn)行.這就是 “與負(fù)流量相比正流量操作敏感性好”的主要原因.
　　與負(fù)流量相比正流量為什么節(jié)油?
　　在負(fù)流量控制的液壓系統(tǒng)中,負(fù)壓信號(hào)的壓力大約是5MPa,此壓力只用于產(chǎn)生負(fù)壓信號(hào);而正流量控制的液壓系統(tǒng)中,由于沒有此裝置,他的回油壓力僅僅是背壓(一般在0.5MPa左右),這就減少了一個(gè)不必要的功率損失,從而使的正流量的挖掘機(jī)在完成同樣工作量的情況下一定比負(fù)流量控制的挖掘機(jī)省油.
　　簡(jiǎn)單的來說
4WRZ25E220-7X/6EG24N9ETK4/D3M