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加长臂挖掘机容易出现的故障!

日期:2018-12-18   来源:
由于挖掘机的作业领域广泛,其使用频次相对较高,通过长时间的作业后,会出现不同程度的磨损和故障问题。
Due to the wide field of excavator operation, its frequency of use is relatively high. After a long period of work, there will be varying degrees of wear and failure problems.
故障一:斗杆缸伸缩缓慢无力
Failure 1: Slow expansion and weakness of bucket cylinder
当长臂挖掘机在作业过程中出现斗杆缸伸缩缓慢无力时,我们应当做如下检查。
When the bucket cylinder of the long arm excavator is unable to expand slowly in the process of operation, we should do the following checks.
1.查看其密封件是否失效。先松开低压腔的油管,放掉腔内液压油,然后启动发动机给高压腔内注入压力油,未见液压油从低压腔的油管中流出,表明斗杆缸活塞密封件密封良好。若密封件失效则会造成低压腔与高压腔的液压油因内泄而互窜。
1. Check whether the seals are invalid. First loosen the tubing in the low pressure chamber, release the hydraulic oil in the chamber, and then start the engine to inject the pressure oil into the high pressure chamber. No hydraulic oil has flowed out of the tubing in the low pressure chamber, which indicates that the piston seal of the bucket rod cylinder is well sealed. If the seals fail, the hydraulic oil in the low pressure chamber and the high pressure chamber will run through each other due to internal leakage.
2.查看安全吸油阀是否正常。安全吸油阀是1个双向保护阀,安装在液压缸和液压马达等执行元件上,当液压缸或马达的某一腔产生瞬间高压时,高压腔的高压油就会打开安全吸油阀中的溢流阀进行溢流,同时负压腔安全吸油阀的单向阀打开,从油箱吸油来补充负压,起到保护油路作用。
2. Check whether the safety oil suction valve is normal. Safety oil suction valve is a two-way protection valve, which is installed on the actuators such as hydraulic cylinder and motor. When a chamber of hydraulic cylinder or motor produces instantaneous high pressure, the high-pressure oil in the high-pressure chamber will open the relief valve in the safety oil suction valve for overflow. At the same time, the one-way valve of the safety oil suction valve in the negative pressure chamber opens and sucks oil from the tank to supplement the negative pressure and protect the oil circuit.
3.检查PPC阀和主控制阀。PPC阀又称先导操纵阀,是一种比例压力控制阀,可依据操作手柄行程的大小输出相应的控制压力及流量,使主控制阀芯存在相应的移动量。
3. Check PPC valve and main control valve. PPC valve, also known as pilot control valve, is a proportional pressure control valve, which can output the corresponding control pressure and flow according to the size of the operation handle stroke, so that the main control valve core has a corresponding amount of movement.
从而起到控制执行元件速度的作用。主控制阀中每一根阀芯控制一支油路的通断,若其中某一阀芯磨损、卡滞甚至堵塞,就会降低相应执行元件的油压和流量,造成执行元件动作迟缓甚至无动作。
So it can control the speed of the actuator. Each spool in the main control valve controls the opening and closing of an oil circuit. If one spool is worn, stuck or even blocked, the oil pressure and flow of the corresponding actuator will be reduced, resulting in slow or no action of the actuator.
故障二:行走跑偏
Fault 2: Walking deviation
当加长臂挖掘机出现行走跑偏故障时首先应当对挖掘机组合阀进行检查。拆卸其限压阀上的2根油管,用堵头堵住出油口,启动发动机,拉动有堵头组合阀的行走操纵手柄加长臂挖掘机,检测油压正常;再拆卸另一侧行走组合阀上的2根油管。
When there is running deviation fault in the long arm excavator, the combined valve of the excavator should be checked first. Remove the two tubing on the pressure limiting valve, plug the oil outlet with a plug, start the engine, pull the walking control handle extension arm excavator with the plug combination valve to check the normal oil pressure, and then remove the two tubing on the other side of the walking combination valve.
再次启动发动机,观察其限压阀的2个油孔是否存在油液流出,若无此现象,则排除组合阀故障问题。
Start the engine again and observe whether there is oil outflow in the two oil holes of the pressure limiting valve. If there is no such phenomenon, troubleshooting of the combined valve will be eliminated.
以上信息是由我们加长臂挖掘机整理发布希望对大家的生活有所帮助,我们的网站是:
The above information is organized and published by our extended arm excavator in the hope of helping everyone's life. Our website is !

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