升降貨梯http://www.lilacred.com/啟閉機(jī)能正常啟、閉閘門(mén)，說(shuō)明控制閥組及液壓站各項(xiàng)功能基本正常；閘門(mén)開(kāi)啟后下滑量嚴(yán)重超標(biāo)，說(shuō)明啟閉機(jī)液壓系統(tǒng)存在較為嚴(yán)重的泄漏；無(wú)外漏油現(xiàn)象，說(shuō)明泄漏存在于啟閉機(jī)液壓系統(tǒng)內(nèi)部。根據(jù)故障現(xiàn)象和檢查情況分析，泄漏部位應(yīng)在液壓缸和控制閥組。

1、由于升降貨梯啟閉機(jī)運(yùn)行時(shí)間較長(zhǎng)，液壓缸密封環(huán)和支承結(jié)構(gòu)破壞、磨損、老化以及缸筒內(nèi)壁拉傷是造成液壓缸內(nèi)泄漏的主要原因。閘門(mén)被提升并鎖定于開(kāi)閘位置后，液壓系統(tǒng)停止工作，液壓缸進(jìn)出油道均被切斷，液壓缸有桿腔在閘門(mén)自重作用下會(huì)建立起一定油壓力，而無(wú)桿腔有體積增大傾向，油壓相對(duì)外較低，兩油腔間會(huì)形成一壓差。
Because cargo lifter hoist run longer, hydraulic cylinder seal ring and bearing structural damage, wear, aging and injury is caused by the inner wall of the cylinder hydraulic cylinder leakage main reason. After the gate is raised and locked in the gate position, the hydraulic system to stop working, hydraulic cylinders are cut out of the oil passages, hydraulic cylinder rod chamber gate under its own weight in certain oil pressure will build, without the rod cavity volume increases tendencies, low oil pressure relative to the outer, will form a pressure differential between the two oil chamber.

2、升降貨梯啟閉機(jī)提升閘門(mén)至開(kāi)閘位置后，液壓缸是利用二位插裝換向閥閥芯密封錐面作鎖定。二位插裝換向閥閥芯錐面多次動(dòng)作后會(huì)有一定量的磨損; 閥芯錐面一側(cè)為有桿腔壓力油，油壓較高，另一側(cè)為冋油道，油壓基本為零；在壓差作用下，液壓缸有桿腔高壓油會(huì)通過(guò)磨損處泄漏回油箱，形成系統(tǒng)泄漏，使液壓缸有桿腔體積減小，活塞下移，表現(xiàn)為閘門(mén)下滑。
Cargo lifter hoist lifting gate to gate position, the hydraulic cylinder is the use of two sealed cartridge spool valve cone as locked. Cartridge valve spool two cone after repeated actions will have a certain amount of wear and tear;spool cone rod chamber pressure side for oil, high oil pressure, the other side of the road for Jiong oil, hydraulic basic zero; in effect under pressure, hydraulic cylinder rod chamber pressure oil will leak back to the tank through the fray to form a system leak, the hydraulic cylinder rod chamber volume decreases, the piston down, the performance of the gate fell.

3、在年久失修下滑量較大的升降貨梯http://www.lilacred.com/液壓?jiǎn)㈤]機(jī)中，一般液壓缸內(nèi)泄漏和系統(tǒng)泄漏同時(shí)存在，本啟閉機(jī)兩種泄漏情況都存在，以液壓缸內(nèi)泄漏為主，系統(tǒng)泄漏為輔。
Decline in disrepair large amount of cargo lifter hydraulic hoist, in general, the hydraulic cylinder leaks and system leaks exist, this hoist two kinds of leaks are present, the main hydraulic cylinder leak, the system for leaks auxiliary.