“爬行”是全自动搅拌车液压传动中经常出现的不正常运动状态。轻微的“爬行”使运动件产生目光不易觉察的振动，显著的“爬行”使运动件产生大距离地跳动。爬行现象是很有害的，因此“爬行”现象对于改善液压系统稳定性和提高机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.
驱动刚性差引起的“爬行”
"Creeping" caused by poor driving rigidity
空气进入油液中后，一部分溶于压力油液中，其余部分就形成气泡浮游在压力油中。因为空气有压缩性，使液压油产生明显的弹性，造成驱动刚性差而引起“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".
在制造和修配零件时，应严格达到公差要求，装配时要保证配合间隙。紧固各管道连接处，防止泄漏。均匀紧固各接合面处的连接螺钉，密封垫应均匀，不允许用多层纸垫。附着于滤油器上的脏物，应采用容量足够的滤油器。改进液压系统，设法防止系统中出现局部真空，并设置必要的排气塞或放气阀。
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.
液压元件间隙大引起的“爬行”
"Creeping" caused by large clearance of hydraulic components
运动件低速运动时，一旦发生干摩擦，阻力增加。这时要求液压泵提高压力，但由于液压泵间隙大而严重漏油，不能适应执行元件因阻力的变化而形成的压力变化而产生“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".
修复或更换液压泵内零件，保证装配要求的间隙，以减少液压泵的泄漏。
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.
控制阀失灵引起的“爬行”：各种控制阀的阻尼孔及节流口被污物堵塞，阀芯移动不灵活等，使压力波动大，造成推力或流量时大时小而产生“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.
保持油液清洁，定期清洗并更换，加强元件的维护，以防液压油污染。
Keep the oil clean, clean and replace regularly, and strengthen the maintenance of components to prevent hydraulic oil pollution.
摩擦阻力变化引起的“爬行”
"Creep" caused by friction resistance change
全自动搅拌车厂家认为这种现象在液压缸出现的较多，主要由于液压缸中心线与活塞杆不平行，活塞杆局部或全长弯曲，缸筒内圆被拉毛刮伤，缸筒精度达不到技术要求，活塞杆两端油封调整过紧等因素会引起“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".
逐项检验液压缸的精度及损伤情况，并进行修复或更新。液压缸安装精度应符合技术要求。
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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