Automatic feeding mixer after a long time of use, there will be some situations, these situations have big and small, small problems will not have a big impact, but big situation may damage the automatic feeding mixer, today I will introduce the cause of engine damage.

1、氣門(mén)腳空地的調(diào)整：配氣安排各機(jī)件在正常運(yùn)用中，跟著零件的磨損，氣門(mén)腳空地將發(fā)生改動(dòng)。如凸輪、氣門(mén)桿端面及挺桿接觸面磨損后空地將變大，而氣門(mén)頭與氣門(mén)座磨損后空地又變小，因此，在調(diào)整中應(yīng)取空地的基地值為宜。如規(guī)矩為0.2~0.25mm,可實(shí)取0.22mm,這么既照顧了空地改動(dòng)的實(shí)際情況，又思考了測(cè)量誤差疑問(wèn)，可充沛保證氣門(mén)腳空地效果的完成。

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

2、氣門(mén)座的鉸削：氣門(mén)座鉸削通常為手作業(yè)業(yè)，應(yīng)格外重視三個(gè)疑問(wèn)：一是在消除凹陷、斑駁，能鉸出無(wú)缺錐面的基礎(chǔ)上，鉸削量越小越好；二是鉸削時(shí)用力要均勻，起刀收刀要輕，少鉸多調(diào)查，以保證較少的鉸削量和較高的光潔度;三是與氣門(mén)試配，判定好作業(yè)面方位和寬度。

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 eliminating depression and mottling and being able to ream out the intact cone surface, the smaller the reaming amount is, the better; second, the force should be uniform when reaming, and the cutter should be light when starting and closing, and more investigation should be carried out with less reaming to ensure less reaming amount and higher finish; Third, try to match with the valve to determine the orientation and width of the working face.

方位應(yīng)調(diào)整到氣門(mén)錐面的中下部，偏上或偏下可用上、下口鉸刀進(jìn)行調(diào)整。作業(yè)面寬度，進(jìn)氣門(mén)可掌握在0.9mm(規(guī)矩為1~2.2mm)，排氣門(mén)可掌握在1.4mm(規(guī)矩為1.5~2.5mm)。實(shí)踐證明上述寬度在氣門(mén)與氣門(mén)座研磨后，進(jìn)氣門(mén)可達(dá)1mm,排氣門(mén)可達(dá)1.5mm,均在規(guī)矩寬度的下限，能大大提高其運(yùn)用壽數(shù)。

The position should be adjusted to the middle and lower part of the valve cone. The upper and lower reamers can be used to adjust the position. The width of working face can be controlled within 0.9mm (1 ~ 2.2mm) for intake valve and 1.4mm (1.5 ~ 2.5mm) for exhaust valve. Practice has proved that the width of the intake valve and the exhaust valve can reach 1 mm and 1.5 mm after grinding the valve and valve seat, which are all in the lower limit of the regular width and can greatly improve the service life.

3、攪拌車(chē)修補(bǔ)質(zhì)量差在修補(bǔ)作業(yè)中出色的疑問(wèn)是氣門(mén)與氣門(mén)座作業(yè)面加工質(zhì)量達(dá)不到懇求，構(gòu)成作業(yè)面燒蝕、凹陷而前期損壞；凸輪軸軸承在刮削中其協(xié)作空地、接觸面積、各軸承同心度達(dá)不到懇求，加速磨損，呈現(xiàn)異響構(gòu)成前期損壞；氣門(mén)導(dǎo)管在更換新件時(shí)，鉸削質(zhì)量達(dá)不到規(guī)矩懇求，直接影響氣門(mén)及氣門(mén)座運(yùn)用壽數(shù)。

3. The problems of poor repair quality of mixer truck in repair operation are that the machining quality of valve and valve seat working surface can not meet the requirements, which results in ablation and depression of working surface and early damage; the clearance, contact area and concentricity of camshaft bearing can not meet the requirements in scraping, which accelerates wear and presents abnormal sound, which results in early damage; when the valve guide is replaced with new parts, the hinge is broken The cutting quality can not reach the standard, which directly affects the service life of valve and valve seat.

自動(dòng)上料攪拌車(chē)

Automatic feeding mixer

4、凸輪軸軸承的刮削：凸輪軸軸承的刮削歸于手作業(yè)業(yè)，保證質(zhì)量有一定難度。為刮削便利，又通常在氣缸體外加工，因此應(yīng)格外留意四個(gè)疑問(wèn)：一是要判定好軸承刮削后內(nèi)孔的直徑;二是刮削中要盡量留意堅(jiān)持軸承內(nèi)孔與外圓的同軸度;三是邊刮削邊與軸頸試配，并保證接觸印痕分布均勻;四是將軸承壓入座孔時(shí)，應(yīng)留意對(duì)正油孔。刮削后裝入凸輪軸，翻滾數(shù)圈，視情進(jìn)行恰當(dāng)修整，接觸面積應(yīng)抵達(dá)75%以上并分布均勻，空地符合規(guī)矩。

4. Scraping of camshaft bearing: scraping of camshaft bearing belongs to manual operation, so it is difficult to ensure the quality. For the convenience of scraping, it is usually processed outside the cylinder body, so we should pay special attention to four questions: first, we should determine the diameter of the bearing inner hole after scraping; second, we should pay attention to the coaxiality of the bearing inner hole and the outer circle during scraping; third, we should try to match with the journal while scraping, and ensure that the contact marks are evenly distributed; fourth, we should pay attention to aligning the oil hole when pressing the bearing into the seat hole. After scraping, install the camshaft, roll for several circles, and properly trim according to the situation. The contact area should reach more than 75% and be evenly distributed, and the open space should conform to the rules.