Excavator tipping and other accidents are unavoidable in extreme working environments, but how to avoid accidents should be studied.
Hitachi excavator difficult problems
After an excavator tipping accident, a better solution plan is to recover the excavator as soon as possible. However, due to the natural environment and its machinery and equipment difficulties, it is usually impossible to immediately guarantee the restoration of the excavator parts. Everyone knows that in an excavator tipping accident, in addition to visible bending, damage, deformation and other problems, there are also some potential problems that cannot be seen to be distinguished, leaving a safety risk for the excavator. Failure to detect the failure immediately will result in secondary common failures, leading to greater damage. So when there is a problem with the excavator, the first thing we think of is to go to the nearby excavator repair shop.
Difficult problems of excavator tipping accident:
1. The parts are deformed, damaged, or cracked.
2. The pipe parts are bent or damaged, and gear oil, fuel, and grease flow out.
3. It cannot be reversed. Changes to the side components (such as batteries, cooling towers) cause invalidity.
4. Deformation and distortion of the sheet metal cover and support frame in the car cab.
5. Compressive damage of shell parts.
6. Damage to parts in the cooling tower.
7. The destruction of other external notes (such as filter elements).
8. The destructiveness of the slewing bearing member is invalid.
9. Damage caused by short-term operation of an engine that has not been shut down immediately when it is tipped over.
When the excavator is tipped for more than an hour, no matter how inconvenient, you must solve it carefully according to the tipping position of the excavator to remove the fuel and grease entering the engine cylinder to prevent it from causing the engine piston to move. The fluid cushion that cannot be reduced causes damage to the crank and connecting rod mechanism of the engine.
On some models and specifications of engine crankshafts, I have personally experienced that not only did the fluid cushion cause the crankshaft to bend and the cylinder compression force was not enough, but even the crankshaft got rid of the cylinder block during the bending damage. A lot of it is that the crankshaft bends seriously, but it endangers the temperature in the cylinder at the end of the engine's reduced stroke schedule, resulting in thicker smoke when the engine starts, and the cylinder load rate is not enough. The cylinder can be broken to determine the difficult cylinder, but the fuel system software is removed. Common failures of parts failure.
Summary: The older engine crank and connecting rod mechanism has high compressive strength, and it is not prone to common failures of crankshaft bending caused by the liquid cushion above the piston rod. However, the excavator that will tip over cannot be started after being restored, and the engine is manually rotated. , Will encounter the situation that the piston rod of a certain cylinder cannot turn over to shrink the top dead center, which is also caused by the liquid cushion. Therefore, when solving the problem of overturning accidents of excavators, it is necessary to carefully analyze the characteristics of the accident and the potential safety hazards that will occur, and not to be careless.
