There will be some problems after the automatic feeding mixer is used for a period of time. Here is the reason for the damage of the engine of the automatic feeding mixer.

1、气门脚空地的调整：配气安排各机件在正常运用中，跟着零件的磨损，气门脚空地将发生改动。如凸轮、气门杆端面及挺杆接触面磨损后空地将变大，而气门头与气门座磨损后空地又变小，因此，在调整中应取空地的基地值为宜。如规矩为0.2~0.25mm，可实取0.22mm，这么既照顾了空地改动的实际情况，又思考了测量误差疑问，可充沛保证气门脚空地效果的完成。

1. Adjustment of valve foot clearance: during normal operation of various parts of the valve arrangement, the valve foot clearance will be changed with the wear of parts. For example, the open space will become larger after the wear of cam, valve stem end face and tappet contact surface, and the open space will become smaller after the wear of valve head and valve seat. Therefore, the base value of the open space should be taken in the adjustment. If the rule is 0.2 ~ 0.25mm, it can be taken as 0.22mm. This not only takes into account the actual situation of open space change, but also considers the question of measurement error, which can fully ensure the completion of open space effect of valve foot.

自动上料搅拌车

Automatic feeding mixer

2、气门座的铰削：气门座铰削通常为手作业业，应格外重视三个疑问：一是在凹陷、斑驳，能铰出无缺锥面的基础上，铰削量越小越好；二是铰削时用力要均匀，起刀收刀要轻，少铰多调查，以保证较少的铰削量和较高的光洁度;三是与气门试配，判定好作业面方位和宽度。方位应调整到气门锥面的中下部，偏上或偏下可用上、下口铰刀进行调整。作业面宽度，进气门可掌握在0.9mm(规矩为1~2.2mm)，排气门可掌握在1.4mm(规矩为1.5~2.5mm)。实践证明上述宽度在气门与气门座研磨后，进气门可达1mm，排气门可达1.5mm，均在规矩宽度的下限，能大大提高其运用寿数。

2. Valve seat reaming: valve seat reaming is usually manual operation, so we should pay special attention to three questions: first, on the basis of depression, mottled and no missing cone, the smaller the reaming amount, the better; Second, the force during reaming should be uniform, the starting and closing of the knife should be light, less reaming and more investigation, so as to ensure less reaming amount and higher finish; Third, trial fit with the valve to determine the orientation and width of the working surface. The orientation shall be adjusted to the middle and lower part of the valve cone, and the upper and lower reamers can be used to adjust it up or down. For the width of the working surface, the inlet valve can be controlled at 0.9mm (the rule is 1 ~ 2.2mm), and the exhaust valve can be controlled at 1.4mm (the rule is 1.5 ~ 2.5mm). Practice has proved that after grinding the valve and valve seat, the inlet valve can reach 1mm and the exhaust valve can reach 1.5mm, both of which are at the lower limit of the regular width, which can greatly improve its service life.

3、自动上料搅拌车修补质量差在修补作业中的疑问是气门与气门座作业面加工质量达不到恳求，构成作业面烧蚀、凹陷而前期损坏；凸轮轴轴承在刮削中其协作空地、接触面积、各轴承同心度达不到恳求，加速磨损，呈现异响构成前期损坏；气门导管在更件时，铰削质量达不到规矩恳求，直接影响气门及气门座运用寿数。

3. The repair quality of automatic feeding mixer truck is poor. The doubt in the repair operation is that the processing quality of the working surface of valve and valve seat can not meet the requirements, which constitutes the ablation and depression of the working surface and early damage; During the scraping of camshaft bearing, its cooperation space, contact area and concentricity of each bearing can not meet the requirements, which accelerates the wear, presents abnormal noise and constitutes early damage; When the valve guide is replaced, the reaming quality can not meet the requirements, which directly affects the service life of the valve and valve seat.