1. Improper application of maintenance data of self feeding mixer

在自上料混凝土搅拌罐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 self loading mixer, it is an important reason that the maintenance data can not be selected scientifically. For example, the width of the contact surface between the valve and the valve seat is specified as 1-2.2mm for the inlet valve and 1.5-2.5mm for the exhaust valve. However, in the actual maintenance, many people think that it is better to be wider than narrow, and they are used to choosing the upper limit or close to the upper limit value, because the width of the working face of the newly repaired valve is close to the service limit. Another example is the valve foot clearance, which is generally 0.2-0.25 mm. However, in maintenance and adjustment, it is 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 knocking noise and early damage.

2. 气门的光磨

2. Smooth grinding of valve

在自上料混凝土搅拌罐车的维修中，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 the self feeding mixer, if the valve is ablated, pitted and sunken, it should be polished. Generally, it is carried out on the polishing mill. Four problems should be paid attention to during the operation: first, ensure that the valve head is concentric with the rod, otherwise, straighten it first; second, the smaller the smooth grinding vehicle can grind out the complete conical surface, the smaller the better; the third is to improve the surface finish as much as possible; the fourth is to ensure that the valve head is concentric with the rod, otherwise it should be straightened first The depression at the end of the valve stem should be ground smooth.

3. 气门导管的铰销

3. Hinge pin of valve guide

自上料混凝土搅拌罐车，气门杆与气门导管配合间隙是决定气门导管使用寿命的关键，因此当更换新的气门导管时，铰销时应严格掌握好配合间隙，使用各搅拌车车型规定间隙的下限，可有效延长使用寿命。

Since the loading mixer, the fit clearance between the valve stem and the valve guide is the key to determine the service life of the valve guide. Therefore, when replacing a new valve guide, the fit clearance should be strictly controlled when the pin is hinged, and the lower limit of the clearance specified for each mixer model can effectively prolong the service life.

4. 气门的研磨

4. Grinding of valve

自上料混凝土搅拌罐车，气门的研磨分为两种情况：一是气门与气门座只有轻微麻点，不需要光磨和铰销时的研磨；二是气门与气门座均经过光磨和铰销后的研磨。前者先用足金钢砂研磨，将麻点研磨掉后，再用细金刚砂研磨，然后涂上机油研磨，直至密封符合要求，宽度符合规定为止。后者只有密封性达不到要求时才进行研磨，但操作时一定要注意，不要过分用力，严禁将气门上下敲打，否则将出现凹形砂痕，影响维修质量。自上料混凝土搅拌罐车发动机出故障不可怕，可怕的是维修不正确，那发动机的性能只会越来越差。

Since the loading mixer, the grinding of valve can be divided into two situations: one is that there are only slight pitting between the valve and the valve seat, which does not need to be polished and reamed; the other is that both the valve and the valve seat are polished and grinded after hinge pin. The former is first ground with full gold steel sand, after grinding off the pitting points, then grinding with fine emery, and then coated with oil for grinding until the sealing meets the requirements and the width meets the requirements. The latter can only be ground when the sealing performance can not meet the requirements. However, attention must be paid during operation, and it is strictly forbidden to knock the valve up and down, otherwise concave sand marks will appear, which will affect the maintenance quality. Concrete mixer engine failure is not terrible, terrible is that the maintenance is not correct, the performance of the engine will only get worse and worse.

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