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. 攪拌車維護(hù)數(shù)據(jù)使用不當(dāng)

　　1. Improper use of mixer maintenance data

　　攪拌車維修中未科學(xué)地選擇維修數(shù)據(jù)是造成機(jī)械零件早期損壞的重要原因之一。例如，閥門與閥座接觸面的寬度規(guī)定為進(jìn)氣閥1-2.2mm，排氣閥1.5-2.5mm。但是，在實(shí)際的維護(hù)中，很多人認(rèn)為寬一點(diǎn)總比窄一點(diǎn)好，所以他們習(xí)慣于選擇上限值或接近上限值，因?yàn)殚y面寬度已經(jīng)接近上限值。例如,閥門間隙,通用汽車提供0.2 - -0.25毫米,但在維護(hù)調(diào)整也認(rèn)為有點(diǎn)大間隙比小一些,因此,在使用的上限,事實(shí)上,間隙太大,不僅降低發(fā)動機(jī)功率,還會出現(xiàn)敲門聲音和早期損壞。

　　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. 閥拋光

　　2. Valve polishing

　　維護(hù)的混合卡車,如果閥門消融,麻點(diǎn)和凹痕,應(yīng)光滑磨削,一般在光滑的磨床,手術(shù)需要注意四個問題:,確保閥頭與桿同心,否則它應(yīng)該變直;其次，在研磨出完整錐面的前提下，輕磨車盡可能的小。三是盡量提高表面光潔度;第四，閥桿下垂端應(yīng)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.閥門導(dǎo)軌鉸鏈銷

　　3. Hinge pin of valve guide rail

　　閥桿與閥管的匹配間隙是決定閥管使用壽命的關(guān)鍵。因此，更換新閥管時，鉸孔銷應(yīng)嚴(yán)格控制配合間隙。每種混合車規(guī)定的間隙下限可以有效延長使用壽命。

　　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. 閥研磨

　　4. Valve grinding

　　閥門研磨分為兩種情況:一種是只對閥門和閥座有輕微的點(diǎn)蝕，不需要光研磨和鉸銷研磨;二是閥門和閥座經(jīng)過輕磨和鉸銷磨。前者先用純金鋼砂磨，將麻磨掉，再用細(xì)砂石磨，涂上油劑磨，直到密封符合要求，寬度符合規(guī)定。后者只有在密封達(dá)不到磨削的要求時，但必須注意操作，不能太用力，嚴(yán)禁上下敲擊閥門，否則會出現(xiàn)凹形砂痕，影響維修質(zhì)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.

　　自上料水泥攪拌車的故障并不可怕，但保養(yǎng)不正確，發(fā)動機(jī)的性能只會越來越差?；祛l器是負(fù)擔(dān)得起，現(xiàn)在是時候買它。

　　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.