挖掘机出现方法痴顽有力的缘故缘故原因!

日期:2019-02-26   源头:http://www.sefibox.com/
  全液压入口挖掘机偶然偶然会出现零件变乱有力、方法痴顽的征象,江苏快三开奖结果阐发其紧张缘故缘故原因是液压体系出现了拦阻。
  The imported full hydraulic excavator sometimes has the phenomenon of weak working and slow moving. We analyze that the main reason is the failure of the hydraulic system.
  1.主泵压力偏低
  1. The main pump pressure is low.
  挖掘机采取双联斜盘式轴向变量柱塞泵。正常环境下,主泵输入油压≥30MPa。要是主泵的柱塞与缸体之间约莫缸体的端面与配流盘之间的磨损量超越跨过范例(柱塞与缸体之间的间隙应小于0.02mm,缸体端面与配流盘之间的打仗面积应不低于90%),就会构成主泵输入压力偏低,应声到呆板的变乱装置,就会出现零件变乱有力的征象。
  The excavator adopts a dual swashplate axial variable piston pump. Normally, the output oil pressure of the main pump is more than 30 MPa. If the wear amount between the plunger and the cylinder body or between the end face of the cylinder body and the valve plate exceeds the standard (the gap between the plunger and the cylinder body should be less than 0.02mm, and the contact area between the cylinder body and the valve plate should not be less than 90%), the output pressure of the main pump will be low, which will be reflected in the working device of the machine, and the whole machine will be powerless.
  2.主泵输入流量控制阀组有拦阻
  2. Failure of main pump output flow control valve set
  以主泵与倡议机的功率抵达佳结婚、富裕发扬倡议机的作用为条件,该机主泵的输入流量是随着倡议机功率的改造而改造的。要是用于调理主泵输入流量的控制阀组出现了拦阻,如PLS反响回路窒息、LS阀阀芯卡逝世、PC阀阀芯卡逝世或PC—EPC电磁阀外部线圈被烧坏等环境,都市构成主泵不停处于一种流量坚定的外形。要是主泵不绝处于小流量外形,呆板在变乱时就会有力、方法痴顽。
  The output flow of the main pump varies with the change of the engine power on the premise that the power of the main pump and the engine can be matched optimally and the role of the engine can be brought into full play. If the control valve group used to regulate the output flow of the main pump fails, such as the blockage of the PLS feedback loop, the blockage of the LS valve core, the blockage of the PC valve core or the burnout of the inner coil of the PC-EPC solenoid valve, the main pump will always be in a constant flow state. If the main pump is always in a small flow state, the machine will be powerless and slow in operation.
  异常,要是直接控制主泵流质改造的主泵的斜盘、伺服活塞等零件被卡逝世,那么主泵的输入流量也不会改造。
  Similarly, if the swashplate, servo piston and other parts of the main pump which directly control the flow change of the main pump are jammed, then the output flow of the main pump will not change.
  3.减压阀输入的控制压力偏低
  3. The control pressure of the pressure relief valve output is low.
  正常环境下,减压阀可以大约将主泵的输入油压飞扬并坚定在3.3MPa,构成控制油压。要是因油质太脏而使减压阀上的锥形阀芯封锁不严,就会招致减压阀的输入压力低于3.3MPa。这时,无论应用手柄怎样方法,控制油压不停偏低,种种变乱装置的主控制阀的阀芯移动量偏小,从而招致流向变乱装置的流量也偏小,构成零件有力。
  Normally, the pressure relief valve can reduce and stabilize the output oil pressure of the main pump at 3.3 MPa, forming a control oil pressure. If the conical spool on the relief valve is not tightly closed due to the dirty oil, the output pressure of the relief valve will be less than 3.3 MPa. At this time, no matter how the operating handle operates, the control oil pressure is always low, and the movement of the valve core of the main control valve of various working devices is small, which leads to the flow of flow to the working device is also small, resulting in the weakness of the whole machine.
  4.主溢流阀的溢流压力偏低
  4. Overflow pressure of main relief valve is low
  主溢流阀将整个液压体系的高压力限定在32.5MPa,敷衍超越跨过此值的高压,主溢流阀将开启卸压,以掩护体系不受粉碎。要是因油质不良而将主溢流阀阀芯上的小孔窒息而招致阀芯常开,约莫主溢流阀的设定溢流压力偏低,都市构成实际溢流压力偏低,即体系压力偏低。
加长臂挖掘机出租
  The main relief valve limits the maximum pressure of the whole hydraulic system to 32.5 MPa. For high pressures above this value, the main relief valve will be opened and unloaded to protect the system from damage. If the main relief valve spool is blocked due to poor oil quality and the spool is often open, or the set relief pressure of the main relief valve is low, the actual overflow pressure will be low, that is, the system pressure is low.
  5.卸荷阀有拦阻
  5. Failure of unloading valve
  当驾驶员启动倡议机并将应用杆置于空挡时,主泵输入液压油颠末卸荷阀直接前去油箱,卸荷压力为3MPa。要是因油质太脏而使卸荷阀阀芯封锁不严,当呆板作业时,主泵的输入油会颠末卸荷阀直通油箱,致使体系创立不起高压;异常,要是卸荷阀上用于隔绝PlS压力油与油箱接通的0形密封圈粉碎时,也会招致主泵液压油直接流回油箱。
  When the driver starts the engine and puts the lever in neutral, the output hydraulic oil of the main pump returns directly to the tank through the unloading valve, and the unloading pressure is 3 MPa. If the discharging valve spool is not closed tightly because of the dirty oil, when the machine is working, the output oil of the main pump will pass through the discharging valve to the tank directly, which makes the system unable to establish high pressure. Similarly, if the 0-ring on the discharging valve is damaged, the hydraulic oil of the main pump will flow back to the tank directly.
  6.LS旁通阀有拦阻
  6. LS Bypass Valve Faulty
  LS旁通阀可颠末阀体上的两个小孔(微小)泄漏失一局部LS回路上的P15压力油,以增长呆板应用的柔和性。要是阀体上的o形密封圈粉碎,PL5压力油就会直接与油箱类似,从而直接招致卸荷阀常开,构成各变乱装置方法有力、痴顽。
  LS bypass valve can leak part of P15 pressure oil in LS circuit through two small holes (slightly) on the valve body to increase the flexibility of machine operation. If the O-ring on the valve body is damaged, the PL5 pressure oil will directly communicate with the oil tank, which indirectly causes the unloading valve to open normally, resulting in the weak and slow movement of each working device.
  总之,挖掘机若出现零件变乱有力,很大水平上可归因于液压油的油质不良。以是,定时互换液压油滤芯(规矩为每500 h互换一次)和过细监控液压油油质(粘度、活动性及有无悬浮物等),就成为抑制或淘汰此类拦阻的关键。
  In a word, if the excavator is unable to work, it can be attributed to the poor oil quality of hydraulic oil to a large extent. Therefore, the key to avoid or reduce such failures is to replace the hydraulic oil filter element on time (stipulated to be replaced every 500 hours) and pay attention to monitoring the quality of hydraulic oil (viscosity, fluidity and suspended matter, etc.).
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