1. Improper application of maintenance data of automatic mixer

在全自動攪拌車維修中不能科學的選擇維修數據是造成機件早期損壞的重要原因。比如氣門與氣門座接觸面的寬度，規定進氣門為1-2.2mm，排氣門為1.5-2.5mm，但在實際維修當中，很多人認為寬一點比窄一點要好，習慣選用上限或接近上限值，因為剛修好的車氣門工作面寬度就已經接近使用極限了。再比如氣門腳間隙，一般車輛規定為0.2-0.25mm，但在維護調整中也會認為間隙大一點比小一點好，因此，超上限使用，實際上間隙過大，不但降低發動機功率，還會出現敲擊聲而早期損壞。

In the maintenance of automatic mixer, the failure to select the maintenance data scientifically is an important reason for the early damage of parts. For example, the width of the contact surface between the valve and the valve seat is 1-2.2mm for the intake valve and 1.5-2.5mm for the exhaust valve. However, in actual maintenance, many people think that a wider one is better than a narrower one. They are used to choose the upper limit or close to the upper limit, because the width of the newly repaired valve working surface is close to the limit of use. Another example is the valve foot clearance, which is generally stipulated as 0.2-0.25 mm for vehicles. However, in maintenance and adjustment, it will be considered that a larger clearance is better than a smaller one. Therefore, if the valve foot clearance is used beyond the upper limit, it will not only reduce the engine power, but also cause knock noise and early damage.
              

2、全自動攪拌車氣門的光磨

2. Smooth grinding of valve of automatic mixer

在全自動攪拌車的維修中，如果氣門出現燒蝕、麻點及凹陷時，均應進行光磨，一般是在光磨機上進行，作業時需要注意四個問題：一是保證氣門頭與桿部同心，否則應先校直；二是光磨輛在能磨出完整的錐面的前提下是越小越好；三是盡量提高表面光潔度；四是氣門桿端部凹陷應予以磨平。

In the maintenance of automatic mixer, if the valve is ablated, pitted and sunken, it should be polished. Generally, it is carried out on the grinder. Four problems should be paid attention to during the operation: first, ensure that the valve head is concentric with the rod, otherwise it should be straightened first; The second is that the smaller the vehicle is, the better it can grind a complete cone; The third is to improve the surface finish as much as possible; Fourth, the valve stem end depression should be polished.

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