“爬行”是全自動攪拌車液壓傳動中經(jīng)常出現(xiàn)的不正常運(yùn)動狀態(tài)。輕微的“爬行”使運(yùn)動件產(chǎn)生目光不易覺察的振動，顯著的“爬行”使運(yùn)動件產(chǎn)生大距離地跳動。爬行現(xiàn)象是很有害的，因此“爬行”現(xiàn)象對于改善液壓系統(tǒng)穩(wěn)定性和提高機(jī)床加工精度是非常重要的。

"Crawling" is an abnormal movement state that often occurs in the hydraulic transmission of full-automatic mixer. Slight "crawling" causes the moving parts to vibrate imperceptibly, while significant "crawling" causes the moving parts to jump at a large distance. Creeping phenomenon is very harmful, so eliminating "creeping" phenomenon is very important to improve the stability of hydraulic system and improve the machining accuracy of machine tools.

驅(qū)動剛性差引起的“爬行”

"Creeping" caused by poor driving rigidity

空氣進(jìn)入油液中后，一部分溶于壓力油液中，其余部分就形成氣泡浮游在壓力油中。因為空氣有壓縮性，使液壓油產(chǎn)生明顯的彈性，造成驅(qū)動剛性差而引起“爬行”。

After the air enters the oil, part of it will dissolve in the pressure oil, and the rest will form bubbles to float in the pressure oil. Because the air has compressibility, the hydraulic oil has obvious elasticity, resulting in poor driving rigidity and "crawling".

在制造和修配零件時，應(yīng)嚴(yán)格達(dá)到公差要求，裝配時要保證配合間隙。緊固各管道連接處，防止泄漏。均勻緊固各接合面處的連接螺釘，密封墊應(yīng)均勻，不允許用多層紙墊。附著于濾油器上的臟物，應(yīng)采用容量足夠的濾油器。改進(jìn)液壓系統(tǒng)，設(shè)法防止系統(tǒng)中出現(xiàn)局部真空，并設(shè)置必要的排氣塞或放氣閥。

When manufacturing and repairing parts, the tolerance requirements shall be strictly met, and the fit clearance shall be ensured during assembly. Tighten the connections of all pipelines to prevent leakage. Tighten the connecting screws at all joint surfaces evenly, and the sealing gasket shall be uniform. Multi layer paper pads are not allowed. The oil filter with sufficient capacity shall be used to remove the dirt attached to the oil filter. Improve the hydraulic system, try to prevent local vacuum in the system, and set necessary vent plug or vent valve.

液壓元件間隙大引起的“爬行”

"Creeping" caused by large clearance of hydraulic components

運(yùn)動件低速運(yùn)動時，一旦發(fā)生干摩擦，阻力增加。這時要求液壓泵提高壓力，但由于液壓泵間隙大而嚴(yán)重漏油，不能適應(yīng)執(zhí)行元件因阻力的變化而形成的壓力變化而產(chǎn)生“爬行”。

When the moving part moves at low speed, once dry friction occurs, the resistance increases. At this time, the hydraulic pump is required to increase the pressure, but due to the large clearance of the hydraulic pump and serious oil leakage, it can not adapt to the pressure change of the actuator due to the change of resistance, resulting in "crawling".

修復(fù)或更換液壓泵內(nèi)零件，保證裝配要求的間隙，以減少液壓泵的泄漏。

Repair or replace the parts in the hydraulic pump to ensure the clearance required for assembly, so as to reduce the leakage of the hydraulic pump.

控制閥失靈引起的“爬行”：各種控制閥的阻尼孔及節(jié)流口被污物堵塞，閥芯移動不靈活等，使壓力波動大，造成推力或流量時大時小而產(chǎn)生“爬行”。

"Crawling" caused by control valve failure: the damping holes and throttles of various control valves are blocked by dirt, and the valve core is not flexible to move, which makes the pressure fluctuate greatly, resulting in "crawling" due to large thrust or small flow.

保持油液清潔，定期清洗并更換，加強(qiáng)元件的維護(hù)，以防液壓油污染。

Keep the oil clean, clean and replace regularly, and strengthen the maintenance of components to prevent hydraulic oil pollution.

摩擦阻力變化引起的“爬行”

"Creep" caused by friction resistance change

全自動攪拌車廠家認(rèn)為這種現(xiàn)象在液壓缸出現(xiàn)的較多，主要由于液壓缸中心線與活塞桿不平行，活塞桿局部或全長彎曲，缸筒內(nèi)圓被拉毛刮傷，缸筒精度達(dá)不到技術(shù)要求，活塞桿兩端油封調(diào)整過緊等因素會引起“爬行”。

The manufacturers of full-automatic mixer truck believe that this phenomenon occurs more in the hydraulic cylinder, mainly because the center line of the hydraulic cylinder is not parallel to the piston rod, the piston rod is partially or fully bent, the inner circle of the cylinder barrel is roughened and scratched, the accuracy of the cylinder barrel cannot meet the technical requirements, and the oil seals at both ends of the piston rod are adjusted too tightly, which will cause "crawling".

逐項檢驗液壓缸的精度及損傷情況，并進(jìn)行修復(fù)或更新。液壓缸安裝精度應(yīng)符合技術(shù)要求。

Inspect the accuracy and damage of the hydraulic cylinder item by item, and repair or update it. The installation accuracy of hydraulic cylinder shall meet the technical requirements.

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