Don't slam the throttle on the hottest locomotive

  • Detail

Don't bang the throttle violently when driving a locomotive Guide: at the construction site, the drivers of some wheeled Locomotives (including large and small dump trucks) often see experimental curve doors such as oil torque/axial force angle. Most of the above locomotives are powered by diesel engines, and the throttle is more harmful to diesel engines. This is illustrated as follows: (1) when starting the throttle, when starting the diesel engine, due to the internal temperature

at the construction site, we often see drivers of some wheeled Locomotives (including large and small dump trucks) like to bang the throttle. Most of the above locomotives are powered by diesel engines, and the throttle detonation is more harmful to the diesel engine. This is illustrated as follows:

(1) when starting

when starting the diesel engine, due to the low temperature in the engine, the oil flow performance is also poor, Therefore, normal lubricating oil film cannot be formed on the surfaces of the moving parts of the crank connecting rod and valve distribution mechanism. At this time, if the accelerator is slammed immediately and runs at high speed, the moving parts will be severely worn due to dry friction and shorten their service life. It is determined that about 50% of the total wear of the moving parts of the diesel engine is caused in the starting stage. If you can't master the correct starting method, the wear will be greater. In general, the wear amount of the cylinder that blows the throttle when starting is equivalent to the wear amount of the diesel engine running for 20~30min under normal conditions. In severe winter, if the accelerator blows when the car starts cold, the cylinder wear will be 2-3 times more than that under the above normal conditions. Therefore, it is strictly forbidden to blow the throttle when starting the locomotive. It should idle at low speed for a while, and then shift to low gear after the oil temperature rises to 40 ℃, increase the throttle appropriately to start smoothly, and then gradually increase the speed or increase the load of the diesel engine before it can be put into operation

(2) blow the throttle before flameout

blow the throttle before flameout will have many adverse consequences for the diesel engine:

(a) blow the throttle will make the excessive diesel oil into the cylinder and it is too late to burn completely, and some of them will flow into the oil pan from the fitting gap between the piston and the cylinder wall, causing the oil to dilute, thereby reducing the lubrication and sealing performance, while the other part will accumulate in the piston crown, the combustion crown and the four walls of the combustion chamber, At the next start-up, it burns together with the diesel injected later, so the pressure in the cylinder rises sharply, producing a serious knocking sound, and making the locomotive speed unstable and power decline

(b) it will increase the carbon deposition in the piston, valve and combustion chamber, resulting in the seizure of the fuel injection head, the failure of the piston ring, the loose sealing of the valve, the accumulation of plastic mountains, the overheating of the diesel engine and the intensified wear of the parts

(c) the temperature of the locomotive before flameout is very high. Knocking the throttle will accelerate the temperature rise in the cylinder, which is easy to cause cylinder pulling, cylinder sticking or piston breaking accidents

(d) knocking the throttle will make the speed of the diesel engine suddenly fast and slow, and the stress condition of all moving parts will change sharply, which is easy to cause the piston to hit the cylinder wall, damage the cylinder bed, break the rocker shaft, pull out the valve push rod, break the timing gear or cause the deformation of the connecting rod

(E) for locomotives in the running in period, there are always micro or macro defects on the mating surface of their moving parts, so the actual contact area of each mating part is much smaller than the design requirements. The detonation accelerator will damage the parts due to the sudden sharp increase of its load, and it is prone to Bush burning and cylinder pulling accidents

(f) for the old locomotives that have been used for a long time, due to the large clearance between the mating parts of each moving part, the detonation of the throttle will cause the parts to be strongly impacted, which is easy to cause the plug to crack, the piston pin to move outward, and even the major accident of smashing machine Kennedy and three other students of Michigan Institute of technology have created their own enterprise - superior filament (advanced wire rod) body

statistical analysis of group patterns

(g) now many locomotives, especially imported locomotives, are mostly equipped with turbochargers, whose speed is as high as 50000~100000r/min, so the price is expensive (up to several thousand yuan to ten thousand yuan). If the engine stalls after blowing the throttle, the oil in the supercharger will stop flowing immediately, and the rotating shaft is still rotating at high speed under the action of inertia, which is easy to bite with the shaft sleeve due to oil interruption. Once the supercharger fails, the power of the locomotive will decrease significantly, and it is often OK to drive without load, but not to work with load. In addition, the throttle detonation will also increase the temperature of the exhaust manifold. If the engine suddenly stalls, the heat will be transferred to the supercharger shell to boil and refine the stopped oil into carbon deposits. When this carbon deposits more and more, it is easy to block the oil inlet, resulting in accelerated wear of the supercharger shaft sleeve due to poor lubrication and premature scrapping

do not blow the accelerator before the locomotive stalls. Unload the load first and let the diesel engine idle at low speed for a while before stalling smoothly

Copyright © 2011 JIN SHI