Concrete pumps are used a lot in the current construction, because they are convenient to use and move, they are welcomed by a wide range of construction parties. What if the oil temperature and water temperature of the engine are too high during construction? This is a problem that many construction parties are very concerned about.
Experts point out that it is very common for concrete pump water temperature and oil temperature to be high during construction. The problem of high oil temperature and high water temperature is similar. There are also large and small cycles, but there is a check valve for oil return. This valve is stuck, the oil temperature will be high, the other is the same as the water temperature. According to many years of experience, when the oil temperature and water temperature of the engine are too high, if the amount of oil and water is not enough, the oil temperature should be lowered first, and then the precipitation temperature should be lowered. The reason is definitely not that oil is more expensive than water. Now we introduce as follows:
① Oil temperature is one of the main factors affecting oil pressure
When the engine oil temperature is too high, it will not only increase the fuel consumption (leakage, transpiration, combustion), but also affect the quality of the oil, making it difficult to form and maintain the oil film of the external appearance of the engine parts. , And then aggravate the wear of the parts.
The effect of water temperature on oil pressure must be completed by oil temperature. So it has a certain degree of indirection and it takes a certain amount of time.
② Excessive oil temperature directly damages the engine
Excessive engine temperature means that the engine's oil and water temperatures exceed 90 ° C. Because of the principle of thermal expansion and contraction, after the temperature rises, it is easy to reflect the shrinkage of the engine gap, which constitutes severe wear or "pulling cylinder".
When the excessive heat generation exceeds the heat dissipation, the temperature of the bearing shell will rise, and some of the temperature will reach the melting point of lead, and the lead and copper in the bearing shell will melt, eventually leading to severe ablation of the crankshaft and bearing or the occurrence of "bearing shaft", with consequences Unbelievable. Therefore, when the temperature of the oil and water is too high, the oil temperature should be lowered first.
③ Precipitation temperature has a great influence on the establishment of the oil pressure of the main shaft oil passage of the engine
As we all know, the temperature of precipitation generally adopts the method of "load reduction and high speed". When the rotation speed is too high, the inertia force and centrifugal force of the piston Lianxuan group will increase, which will increase the load on the crankshaft bearing. Together, the speed of the relative collision between the journal and the bush will also increase, which will increase the amount of heat that occurs in a unit time, and the amount of oil in the oil pump will drop. Many oils will be thrown out of the main oil passage, and then cause the appearance of the various parts to conflict. The satisfactory lubricating oil increases the wear and the oil temperature further increases.
④ Lowering the oil temperature can slow down the rate of water temperature rise
The role of the water tank is to lower the oil temperature of the engine. Generally, the method of "load reduction and low speed" is adopted to reduce oil temperature. At this time, although the heat exchange time of the coolant at high temperature parts is long, the water flow speed is slowed down and the heat dissipation time is extended. At the same time, due to load reduction and speed reduction, the amount of heat generated by the collision of various moving parts is reduced accordingly.
Therefore, lowering the oil temperature can not only reduce the amount of heat generated by the engine, but also indirectly reduce the amount of heat absorbed by the coolant, and then it can also slow down the rate of increase in water temperature.
Concrete pump is a kind of mechanical equipment used by many construction parties. What should I do if the water temperature and oil temperature of the concrete pump are high together during the construction? After the above introduction, trusting the broad users has already understood this issue.