Some drivers reported that the same blender they and their friends bought would have engine problems after a period of use, but the engine of their friend's car was OK. What's up? Let's find out.

　　1. 搅拌车维护数据使用不当

　　1. Improper use of mixer maintenance data

　　搅拌车维修中未科学地选择维修数据是造成机械零件早期损坏的重要原因之一。例如，阀门与阀座接触面的宽度规定为进气阀1-2.2mm，排气阀1.5-2.5mm。但是，在实际的维护中，很多人认为宽一点总比窄一点好，所以他们习惯于选择上限值或接近上限值，因为阀面宽度已经接近上限值。例如,阀门间隙,通用汽车提供0.2 - -0.25毫米,但在维护调整也认为有点大间隙比小一些,因此,在使用的上限,事实上,间隙太大,不仅降低发动机功率,还会出现敲门声音和早期损坏。

　　The unscientific selection of maintenance data is one of the important reasons for the early damage of mechanical parts. For example, the width of the valve seat contact surface is specified as intake valve 1- 2.2mm , vent valve One point five - 2.5mm 。 However, in the actual maintenance, many people think that a little wider is better than a little narrower, so they are used to choose the upper limit value or close to the upper limit value, because the valve face width is close to the upper limit value. For example, valve clearance, provided by General Motors zero point two -- zero point two five Mm, but in the maintenance adjustment, it is also considered that the clearance is a little larger than a little smaller. Therefore, in the upper limit of use, in fact, the clearance is too large, which not only reduces the engine power, but also causes knocking sound and early damage.

　　2. 阀抛光

　　2. Valve polishing

　　维护的混合卡车,如果阀门消融,麻点和凹痕,应光滑磨削,一般在光滑的磨床,手术需要注意四个问题:,确保阀头与杆同心,否则它应该变直;其次，在研磨出完整锥面的前提下，轻磨车尽可能的小。三是尽量提高表面光洁度;第四，阀杆下垂端应磨平。

　　For the maintenance of the mixing truck, if the valve is melted, the pits and dents should be grinded smoothly. Generally, in the smooth grinder, four problems should be paid attention to during the operation: first, make sure that the valve head is concentric with the rod, otherwise it should be straightened; second, on the premise of grinding out the complete cone surface, the light grinding truck should be as small as possible. Third, try to improve the surface finish; fourth, the sagging end of the valve rod should be polished.

　　3.阀门导轨铰链销

　　3. Hinge pin of valve guide rail

　　阀杆与阀管的匹配间隙是决定阀管使用寿命的关键。因此，更换新阀管时，铰孔销应严格控制配合间隙。每种混合车规定的间隙下限可以有效延长使用寿命。

　　The matching clearance between the valve stem and the valve tube is the key to determine the service life of the valve tube. Therefore, when replacing the new valve pipe, the fit clearance of reaming pin should be strictly controlled. The specified lower clearance limit of each hybrid vehicle can effectively extend its service life.

　　4. 阀研磨

　　4. Valve grinding

　　阀门研磨分为两种情况:一种是只对阀门和阀座有轻微的点蚀，不需要光研磨和铰销研磨;二是阀门和阀座经过轻磨和铰销磨。前者先用纯金钢砂磨，将麻磨掉，再用细砂石磨，涂上油剂磨，直到密封符合要求，宽度符合规定。后者只有在密封达不到磨削的要求时，但必须注意操作，不能太用力，严禁上下敲击阀门，否则会出现凹形砂痕，影响维修质量。

　　Valve lapping can be divided into two situations: one is only slight pitting on the valve and valve seat, without light lapping and hinge pin lapping; the other is light lapping and hinge pin lapping on the valve and valve seat. The former is first ground with pure steel sand, then with fine sand stone, and finally with oil agent until the sealing meets the requirements and the width meets the requirements. In the latter case, only when the seal fails to meet the grinding requirements, the operator shall pay attention to the operation and not use too much force. It is strictly forbidden to knock the valve up and down, otherwise concave sand marks will appear, which will affect the maintenance quality.

　　自上料水泥搅拌车的故障并不可怕，但保养不正确，发动机的性能只会越来越差。混频器是负担得起，现在是时候买它。

　　The failure of the concrete mixer is not terrible, but the maintenance is not correct, and the performance of the engine will only get worse and worse. Mixers are affordable, and it's time to buy them.