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修理挖掘机的时大家要注意什么?

日期:2020-09-24   来源:
一,活塞杆用火升温
1、 The piston rod is heated by fire
因为活塞杆与气缸套是过渡配合,因此在安裝气缸套时,应先使活塞杆受热变形,这时候,一些维修人员便会将活塞杆放到用火上马上加温,那样的作法是十分不正确的,由于活塞杆各位置厚薄不匀,热涨冷缩水平便会不一样,用火加温会使活塞杆遇热不匀,非常容易造成形变;活塞杆表层还会继续粘附碳灰,减少活塞杆的使用期。
Because the piston rod and the cylinder liner are transitional fit, so when installing the cylinder liner, the piston rod should be heated and deformed first. At this time, some maintenance personnel will put the piston rod on the fire for heating immediately, which is quite incorrect. Because the thickness of the piston rod is uneven at each position, the level of heat expansion and cold contraction will be different. Heating with fire will make the piston rod encounter heat unevenly It is easy to cause deformation; the surface layer of the piston rod will continue to adhere to carbon ash, thus reducing the service life of the piston rod.
假如活塞杆做到一定溫度后当然制冷,其合金成分会遭受毁坏并使耐磨性大幅度降低,其使用期也会显著减少。在安裝气缸套时,可将活塞杆放到滚油中匀称加温使其迟缓澎涨,切勿用用火马上升温。
If the piston rod is cooled at a certain temperature, its alloy composition will be destroyed and its wear resistance will be greatly reduced, and its service life will also be significantly reduced. When installing the cylinder liner, the piston rod can be evenly heated in the rolling oil to make it expand slowly. Do not use fire to heat up immediately.
二,用砂纸打磨抛光活塞销
2、 Grind and polish the piston pin with sandpaper
针对一些缺乏经验的维修工而言,内蒙古挖掘机刮瓦是一项难度系数较高的工作中,因为刮瓦技术性难以把握,因此活塞销就不容易做到技术标准,因此,有些人在拆换活塞销时,为扩大活塞销与发动机曲轴的触碰总面积,就用砂纸打磨抛光以替代刮瓦。这类方式 在具体检修中是极不可取的,由于砂纸上的磨砂颗粒偏硬,而活塞销铝合金却过软,那样在打磨抛光时沙粒非常容易置入铝合金内,柴油发动机工作中时候加快电动机轴的损坏,减少发动机曲轴的使用期。
For some inexperienced maintenance workers, scraping tile of Inner Mongolia excavator is a work with high difficulty coefficient. Because the scraping tile is difficult to grasp, it is not easy for the piston pin to meet the technical standard. Therefore, when replacing the piston pin, in order to expand the total contact area between the piston pin and engine crankshaft, sandpaper is used to polish instead of scraping bush. This kind of method is extremely undesirable in the specific maintenance, because the sanding particles on the sandpaper are hard, but the aluminum alloy of piston pin is too soft, so it is very easy to put the sand particles into the aluminum alloy during grinding and polishing. When the diesel engine is working, the damage of the motor shaft is accelerated and the service life of the engine crankshaft is reduced.
呼和浩特二手挖机
Hohhot used excavator
三,地脚螺栓拧得过紧
3、 The anchor bolt is over tightened
工程机械设备在拆卸全过程中,许多位置的地脚螺栓全是有要求转距规定的,例如齿轮箱、气缸盖、轮圈、曲轴和前桥总成等位置,扭紧扭矩在使用说明上都有要求,切勿随便更改。可是许多应用工作人员都误以为紧一些会更安全性,可是拧得过紧会导致螺丝或地脚螺栓断裂,也很有可能因为外螺纹扣松而造成常见故障。
During the whole process of construction machinery and equipment disassembly, the required torque of anchor bolts at many positions is specified, such as gearbox, cylinder head, wheel rim, crankshaft and front axle assembly, etc. there are professional requirements for tightening torque in the use instructions, so do not change them casually. However, many application workers mistakenly think that tightening is more safe. However, over tightening will cause the screw or anchor bolt to break, and it is also possible to cause common faults due to loose external thread.
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四,轮胎气压标准太高
4、 The tire pressure standard is too high
轮胎式挖掘机的车胎打气工作压力是决策其使用期和工作效能的关键要素。呼市挖掘机租赁轮胎气压标准过高或过低都是危害其使用期,另外也不利行车安全,尤其是在酷热的夏天。科学研究的打气规范应该是:以车胎的轮胎气压标准为标准,伴随着平均气温的转变,对轮胎气压标准略微调节才对。比如:夏天应该比冬天低5%-7%,因充分考虑夏天平均气温高,汽体遇热,工作压力提高,反过来冬天务必做到轮胎气压标准或稍低一点。
The tire inflation pressure is the key factor to determine the service life and work efficiency of the tire excavator. High or low tire pressure standards of Hohhot excavators are harmful to their service life, and also harmful to driving safety, especially in hot summer. The inflation standard of scientific research should be: take the tire pressure standard as the standard, and adjust the tire pressure standard slightly with the change of average temperature. For example, in summer, it should be 5% - 7% lower than that in winter, because the average temperature in summer is high, the vapor body is hot, and the working pressure is increased. In turn, the tire pressure must be lower in winter.
五,骨架密封液压密封件经常性拆换
5、 The framework seal hydraulic seal is often replaced
挖机骨架密封液压密封件关键功效是避免外部化学物质侵入挖机内及其避免挖机內部泄露。骨架密封密封性应用一定時间后,其密封性功效衰减系数,很有可能造成 机内汽车机油泄露,外部尘土碎石子等细微化学物质侵入机内,进而造成 挖机常见故障。
The key function of hydraulic sealing parts of excavator framework is to avoid external chemical substances from entering into the excavator and to avoid internal leakage of excavator. After the skeleton sealing is applied for a certain period of time, its sealing effect attenuation coefficient is likely to cause the leakage of automobile oil inside the machine, and the fine chemical substances such as dust and gravel from outside may invade the machine, which will cause the common faults of excavators.
六,水箱温度过高骤加凉水
6、 If the temperature of water tank is too high, add cold water
柴油发动机过载工作、排热不太好或储水箱少水都是导致水箱温度过高,这时假如马上添加凉水,便会造成 气缸盖和发动机缸体爆裂。因而,应用中一旦发觉水箱温度过高,应采用应急措施终止工作,使柴油发动机冷却循环水自主减温。
Diesel engine overload work, heat discharge is not good or water storage tank water is too high, if you immediately add cold water, it will cause cylinder head and engine block burst. Therefore, once the temperature of the water tank is too high, emergency measures should be taken to stop the operation, so that the cooling water of diesel engine can automatically reduce the temperature.
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