The self feeding mixer truck is an important equipment for producing concrete. Many people do not pay attention to maintenance when using it, and they find that the operating efficiency of the self feeding mixer truck decreases when using it, but they do not know what the reason is? The main reasons for the decrease in operating efficiency of self feeding mixer trucks are as follows:

1.滤芯与油液的相容性。自上料搅拌车中既包含有金属过滤元件，也有占大多数的非金属过滤元件．它们都存在着是否能与系统中油液相容的问题。其中包括化学变化与热效应变化的相容问题。尤其是在高温条件下能否不受影响更为重要。因此，各种过滤元件都必须在高温下进行油液相容性试验。

1. Compatibility between filter element and oil. The self feeding mixer truck contains both metal filtration components and the majority of non-metallic filtration components, both of which have compatibility with the oil in the system. This includes the compatibility issue between chemical changes and thermal effects. Especially under high temperature conditions, it is more important to be unaffected. Therefore, various filtering elements must undergo oil compatibility tests at high temperatures.

2.低温工作的影响。系统在低温下工作也对自上料搅拌车有不利的影响。因为在低温时，过滤元件中有些非金属材料会变得更脆弱；而且在低温时，油液黏度的增大会引起压力降升高，极易引起介质材料产生裂缝。

2. The impact of low-temperature operation. The system's operation at low temperatures also has adverse effects on the self feeding mixer truck. Because at low temperatures, some non-metallic materials in the filter elements become more fragile; Moreover, at low temperatures, an increase in oil viscosity can cause an increase in pressure drop, which can easily cause cracks in the medium material.

3.油液的周期性流动。系统中的油液流动通常都是不稳定的。在流量发生变化时，会引起滤芯的弯曲变形。在有周期性流动的情况下，由于滤芯介质材料的多次反复变形，会引起材料的疲劳破坏形成疲劳裂缝。使用自上料搅拌车时要养成良好的习惯，定期保养。

3. Periodic flow of oil. The oil flow in the system is usually unstable. When the flow rate changes, it can cause the filter element to bend and deform. In the case of periodic flow, the repeated deformation of the filter medium material can cause fatigue damage and form fatigue cracks. When using self feeding mixer trucks, it is important to develop good habits and maintain them regularly.

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