现在，在很多工程项目中，可以看到挖掘机伸出手臂的身影，挖掘机伸出手臂在城市化建设中起着重要的作用。 但是，施工中发生了各种各样的故障，例如加长挖掘机的斗杆，斗杆的动作特别慢，处于无力的状态。 今天，小张向大家说明这些症状的原因，希望在生活中帮助你。
Nowadays, in many engineering projects, we can see the figure of the excavator stretching out its arm, which plays an important role in the construction of urbanization. However, a variety of faults occurred during construction, such as lengthening the bucket rod of excavator. The bucket rod moves very slowly and is in a weak state. Today, Xiao Zhang explained to you the causes of these symptoms, hoping to help you in life.
In fact, the lifting speed of the arm is closely related to the hydraulic system. Low speed and low speed are mainly caused by the power reduction of the hydraulic cylinder. The main reasons are as follows.
1. Weakness caused by damage to hydraulic cylinder大臂就像挖掘机的手臂，油缸就像控制运动的神经系统。当液压油缸出现以下故障时，如油缸应变、活塞密封圈损坏、油缸盖密封圈损坏等。，会造成漏油或窜油现象，从而导致油缸的内部容积效率降低，输出功率改变。挖掘机动臂的上升速度减少，产生无力的问题。
The arm is like the arm of a digger, and the cylinder is like the nervous system that controls movement. When the following faults occur in the hydraulic cylinder, such as cylinder strain, piston seal ring damage, cylinder head seal ring damage, etc. It will cause oil leakage or oil channeling, which will reduce the internal volume efficiency of the cylinder and change the output power. The rising speed of excavator arm decreases, which causes the problem of powerlessness.
2. Hydraulic oil pump power reduction
The second reason is the hydraulic oil pump of the excavator extension arm. When the leakage of the hydraulic pump increases and the mechanical friction loss increases, the total power of the pump will be reduced and the flow rate of the pump will be reduced accordingly. Because the power of the hydraulic cylinder is proportional to the flow of the hydraulic cylinder, the power of the hydraulic cylinder will be reduced and the lifting speed of the arm will be slowed down.
3. Impact of oil leakage
The slow lifting of the arm is closely related to the oil circuit of the hydraulic system. When there is oil leakage, for example, the suction section of the oil pump is not well sealed, the pressure section from the oil pump to the cylinder leaks out of the system or leaks back to the oil tank through the operation valve. Under the above circumstances, the oil flow velocity and pressure of the oil cylinder will decrease, resulting in a slower lifting speed of the arm.
4. Oil line blockage
The blockage of the oil line causes weakness of the arm. When there are too many mechanical impurities in excavator hydraulic oil, the impurities will block the parts with large oil path and small oil loading surface, reduce the flow of the cylinder, reduce the output power of the cylinder, and reduce the lifting speed of the arm. In addition, blockage of oil filter or radiator in oil return circuit can also cause arm lift weakness.
5. Bad Sealing of Digger Valve
It can be seen from the opening that the power of night pressure is positively correlated with the hydraulic pressure of the cylinder. When the gate valve of the load valve or speed regulating valve is not closed tightly, the throttle valve is not closed tightly with the seat due to the residual warning, and the sealing of the gate valve and the seat is not good, the hydraulic pressure of the cylinder will decrease with the decrease, and then the rear arm will rise slowly.
The five aspects mentioned in the above article are the reasons for the slow movement of the extended arm excavator. Of course, there are other reasons in real life, which requires us to combine the actual situation, specific problems to analyze, find out the main problems, to solve the problem of excavator elongation arm.