1. Improper application of maintenance data of automatic mixer

在全自动搅拌车维修中不能科学的选择维修数据是造成机件早期损坏的重要原因。比如气门与气门座接触面的宽度，规定进气门为1-2.2mm，排气门为1.5-2.5mm，但在实际维修当中，很多人认为宽一点比窄一点要好，习惯选用上限或接近上限值，因为刚修好的车气门工作面宽度就已经接近使用极限了。再比如气门脚间隙，一般车辆规定为0.2-0.25mm，但在维护调整中也会认为间隙大一点比小一点好，因此，超上限使用，实际上间隙过大，不但降低发动机功率，还会出现敲击声而早期损坏。

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、全自动搅拌车气门的光磨

2. Smooth grinding of valve of automatic mixer

在全自动搅拌车的维修中，如果气门出现烧蚀、麻点及凹陷时，均应进行光磨，一般是在光磨机上进行，作业时需要注意四个问题：一是保证气门头与杆部同心，否则应先校直；二是光磨辆在能磨出完整的锥面的前提下是越小越好；三是尽量提高表面光洁度；四是气门杆端部凹陷应予以磨平。

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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