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金沙手机娱乐网址长臂挖掘机系统故障常见的检查方法

日期:2021-01-25   来源:
任何一种机器用久了都会出现一定的机械故障,所以知道挖掘机的故障处理和分析 是必不可少的。处理故障时要学会从简单到复杂、由浅入深的原则对故障进行查找排除,以 免带来一些不必要的麻烦,少走弯路。以一台金沙手机娱乐网址长臂挖掘机为例,因运用年限较长,作业工况恶劣,加上维护维护不到位,在野外施工过程中经常呈现毛病
Any kind of machine used for a long time will appear certain mechanical failure, so it is essential to know the excavator fault treatment and analysis. When dealing with the fault, we should learn to find and eliminate the fault from simple to complex, from simple to deep, so as to avoid some unnecessary trouble and avoid detours. Taking a long arm excavator as an example, due to its long service life, bad working conditions and inadequate maintenance, it often presents problems in the field construction process
1. 行走跑偏
1. Walking deviation
金沙手机娱乐网址长臂挖掘机
该挖掘机发作行走跑偏毛病,在确定行走马达技能情况正常、履带松紧度调整恰当的情况下,作如下排查:
The excavator suffered from running deviation. After confirming that the motor skill was normal and the track tightness was properly adjusted, the following troubleshooting was carried out:
(1) 查看反转接头
(1) View center reversal connector
反转接头处油道许多,相互之间简单勾结。先拆开 2 个行走马达的油管,然后堵死其间 1 个马达油管;再发动发动机,拉动堵死油管马达的换向阀,发现油液压力过低,而没有堵死的液压马达的油孔出油。由此断定反转接头的油道密封欠好。替换反转接头的密封件,毛病不见。
There are many oil passages at the center reversal joint, which are simply colluded with each other. First, the oil pipes of two walking motors were disassembled, and then one of them was blocked. Then, the engine was started, and the reversing valve of the blocked oil pipe motor was pulled. It was found that the oil pressure was too low, but the oil outlet of the hydraulic motor was not blocked. Therefore, it is concluded that the oil passage seal of the center reversal joint is not good. Replace the seal of the center reversal joint, the problem is not found.
(2) 查看组合阀
(2) View combination valve
先查看行走速度慢一侧的行走组合阀。拆开其限压阀上的 2 根油管,用堵头堵住出油口,发动发动机,拉动有堵头组合阀的行走操作手柄,检测油压正常;再拆开另一侧行走组合阀上的 2 根油管,再次发动发动机,调查其限压阀的 2 个油孔无油液流出,由此判别毛病不在组合阀。
First check the walking combination valve on the slow side. Remove the two oil pipes on the pressure limiting valve, plug the oil outlet with a plug, start the engine, pull the walking handle of the combined valve with a plug, and check that the oil pressure is normal; then remove the two oil pipes on the walking combined valve on the other side, start the engine again, and investigate that there is no oil flowing out of the two oil holes of the pressure limiting valve, so as to judge that the fault is not in the combined valve.
2. 斗杆油缸弹性缓慢无力
2. The elasticity of stick cylinder is slow and weak
该金沙手机娱乐网址长臂挖掘机在作业过程中呈现斗杆油缸弹性缓慢无力毛病,经剖析作如下排查:
During the operation of the long arm excavator, there was a problem of slow and weak elasticity of the stick cylinder
(1) 查看密封件
(1) Look at the seals
若斗杆油缸活塞等处密封件失效,将形成低压腔与高压腔的液压油因内泄而互窜。先松开低压腔的油管,放掉腔内液压油,然后发动发动机给高压腔内写入压力油,未见液压油从低压腔的油管中流出,标明斗杆缸活塞密封件密封杰出。
If the seals in the piston of the stick cylinder fail, the hydraulic oil in the low-pressure chamber and the high-pressure chamber will move with each other due to internal leakage. First, loosen the oil pipe in the low pressure chamber and drain the hydraulic oil in the chamber. Then start the engine to write the pressure oil into the high pressure chamber. No hydraulic oil flows out of the oil pipe in the low pressure chamber, indicating that the piston seal of the stick cylinder is well sealed.
(2) 查看安全吸油阀
(2) Look at the safety suction valve
斗杆油缸作业回路上装有 2 个安全吸油阀,若其间某个安全吸油阀的单向阀失效成为双向直通,或许在溢流阀溢流压力很低时,都会形成该侧油腔的油压不能树立,压力油直接经过单向阀或溢流阀泄入油箱,使斗杆缸动作缓慢无力乃至不能作业。
Two safety oil suction valves are installed on the operation circuit of the stick cylinder. If the check valve of one of the safety oil suction valves fails and becomes two-way straight through, maybe when the overflow pressure of the relief valve is very low, the oil pressure in the oil chamber on this side can not be set up, and the pressure oil is directly discharged into the oil tank through the check valve or the relief valve, which makes the stick cylinder move slowly, powerless and even unable to operate.
安全吸油阀若发作上述毛病,在操作手柄处于中立方位停机后,斗杆油缸会主动缓慢回落。但是该斗杆缸没有发现此种表象,阐明毛病不在安全吸油阀。
If the above problems occur in the safety suction valve, the stick cylinder will fall back slowly after the operation handle is in the neutral position. However, this phenomenon is not found in the stick cylinder, which indicates that the fault is not in the safety suction valve.
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