What are the taboos in the operation of excavators in winter?
In cold winter, the temperature is very low. It's a tough time for the equipment to be built. However, some improper operation of the machine owners bring irreparable damage to the excavator. Let's look at the main mistakes.
The wrong way is to leave the water too early or not to cool the water
The serious consequence is: engine body cracking or suddenly shrinking, cracks appear.
The correct method: before the flameout to idle operation, until the cooling water temperature below 60 degrees Celsius, the water is not hot, then flameout water. If the cooling water is released too early, it means that when the body is suddenly attacked by cold air at high temperature, it will produce sudden shrinkage and crack. Therefore, when the water is discharged, the residual water in the body should be completely discharged, so as to avoid the expansion of the ice and make the body crack.
Wrong practice two, random selection of fuel
Can cause serious consequences: reducing the service life of the engine, the damage probability of the correct approach: liquidity of the diesel low temperature in winter becomes worse, viscosity increases, is not easy to spread, resulting in poor atomization, combustion deterioration, resulting in a decline in the power and economy performance of the diesel engine. So the winter should choose low pour point of light diesel oil combustion and good performance. General requirements of diesel pour point should be lower than the local minimum temperature 7-10 the current season.
Wrong practice three. Fire starting with naked flame
Serious consequences: heavy burn machines, light damage to the engine
Correct method: the air filter can not be removed, cotton dipped in diesel fuel, ignited, made into a fire, placed in the intake pipe, combustion support start. In the process of starting, the dusty air will be sucked directly into the cylinder without filtering, causing abnormal wear of the piston, cylinder and other parts, and will cause the diesel engine to work rough and damage the machine.
Wrong practice four. Bake oil pan with open flame
The serious consequences can be caused by heavy burning of machines, but slight wear of machines
Correct method: baking oil with open flame will make the oil in the oil pan deteriorate, even burn, lubrication performance decreased or completely lost, thus aggravating the machine wear. Winter should choose low pour point oil, starting method can be used when the machine water heating to improve oil temperature.
Wrong practice five, improper startup method
Serious consequences that can cause serious damage to the machine
The right approach: first insulation quilt in the water tank, open drain valve, continuous injection of 60-70 C clean water to the water tank, touch the drain valve out of the water is hot, and then close the drain valve, 90-100 C to clean soft water poured into the water tank, and crank crankshaft, the moving parts are properly pre lubrication, and then re start.
Wrong practice six, low temperature load operation
Serious consequences: serious wear and tear of the machine
Correct method: after the diesel engine starts fire, some drivers can not wait to immediately put into the load operation. The diesel engine which burns soon, because the body temperature is low, the engine oil viscosity is big, the engine oil is not easy to fill the friction surface of the movement pair, will cause the machine to wear seriously. In addition, the plunger spring, the valve spring and the injector spring are easy to break because of "cold brittleness". Therefore, when the diesel engine starts fire, it should be idling for a few minutes at low and medium speed. When the cooling water temperature reaches 60 degrees, the load will be put into operation again.
Wrong practice seven, do not pay attention to the body insulation
Serious consequences: reduce working life, damage the engine
The correct method: low temperature in winter, easy to make the diesel engine cooling too much work. Therefore, insulation is the key to use a diesel engine in winter. In the northern area, the diesel engine used in winter should be equipped with thermal insulation equipment such as thermal insulation cover and insulation curtain. In addition, thermostat plays an important role in the temperature rise of diesel engine. Therefore, the winter should be checked before the thermostat is working properly, the thermostat failure should be promptly replaced, not easy to cause poor atomization, spray combustion deterioration, resulting in a decline in the power and economy performance of the diesel engine. So the winter should choose low pour point of light diesel oil combustion and good performance. General requirements of diesel pour point should be lower than the local minimum temperature 7-10 the current season.
For the same equipment, why some machine main used equipment for many years, and some old but vigorous equipment is still in use, for a short time, then the size of the problem constantly? After excluding some external factors, we should find more reasons from ourselves. Learn from an experienced predecessor.
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