Adjustment of axial clearance of camshaft of biogas generator set. When the camshaft works, it needs to leave a certain axial clearance due to thermal expansion. But if the clearance is too large, more than 2.5mm, it will cause the axial movement of camshaft and aggravate the wear of parts. Moreover, due to the change of camshaft position, it will cause the change of gas distribution phase and affect the normal work of Shandong biogas generator set. Therefore, the camshaft should be positioned axially.

发电机工作时，由于零件的磨损与松动，或者正时齿轮室盖经过拆装后，均需调整凸轮轴的向间隙，以保证凸轮轴正常工作。发电机凸轮轴的轴向定位，是用齿轮室盖上的止推螺钉实现的。调整时，需将止推累钉拧到底，消除轴向间隙，然后再退回约1/4圈即可。

When the generator is working, due to the wear and looseness of parts, or after the timing gear housing cover is disassembled, the clearance of camshaft should be adjusted to ensure the normal operation of camshaft. The axial positioning of the generator camshaft is realized by the thrust screw on the gear housing cover. When adjusting, screw the thrust pin to the end to eliminate the axial clearance, and then return about 1 / 4 turn.

不能将发电机曲轴箱的通气孔堵死。发电机工作过程中，每当活塞下行时，曲轴箱内的气体（包括泄漏来的燃气）受压缩，使箱内气体压力升高，造成油底壳结合面处机油向外渗漏，并对活塞运动产生阻力。因此，发电机曲轴箱应有通大气的通气孔。

Do not block the vent hole of the generator crankcase. During the working process of the generator, whenever the piston goes down, the gas (including the leaked gas) in the crankcase is compressed, which increases the gas pressure in the crankcase, causes the oil leakage at the joint surface of the oil pan, and produces resistance to the piston movement. Therefore, the generator crankcase should have air vent.

沼气发电机组

Biogas Generator Set 

不同型号的发电机，曲轴箱上通气孔的位置不一样，但其工作原理相同，即单向阀作用原理。当活塞由止点向下止点移动时，曲轴箱气压增高将阀打开，使气体排出；当活塞由下止点向上止点移动时，曲轴箱气压随着空间变大而降为负压。

Different types of generator, the position of the crankcase vent is not the same, but its working principle is the same, that is, the principle of one-way valve. When the piston moves from dead center to down dead center, the increase of crankcase air pressure will open the valve and exhaust the gas; When the piston moves from the bottom dead center to the top dead center, the crankcase air pressure decreases to negative pressure as the space increases.

负压使阀堵住曲轴箱与外界的通道，阻止外界的灰尘进入曲轴箱，保持润滑油的清洁，并使发电机工作时润滑油向外渗泄的机会减少。因此，发电机曲轴箱的通气孔应保持畅通，保证曲轴箱对外呼气。

The negative pressure makes the valve block the passage between the crankcase and the outside, prevents the outside dust from entering the crankcase, keeps the lubricating oil clean, and reduces the chance of lubricating oil leakage when the generator is working. Therefore, the ventilation hole of the generator crankcase should be kept unblocked to ensure that the crankcase exhales.

曲轴烧蚀，主要由曲轴轴颈与轴瓦间未能形成有用润滑油膜，使得曲轴轴颈与轴瓦直接摩擦所致。当发电机发生曲轴烧蚀时，会冒白烟，发出金属撞击异响声，甚至会造成曲轴与轴瓦抱死在一起而无法转动。因此，必须对其故障产生的原因进行正确地分析与判断。

The crankshaft ablation is mainly caused by the failure to form a useful lubricating oil film between the crankshaft journal and the bearing bush, which causes the direct friction between the crankshaft journal and the bearing bush. When the generator crankshaft is ablated, it will emit white smoke, make metal impact noise, and even cause the crankshaft and bearing bush to lock together and cannot rotate. Therefore, it is necessary to correctly analyze and judge the causes of the fault.