Adjust the axial clearance of the camshaft of the biogas generator set. Due to the thermal expansion of camshaft during operation, a certain axial clearance is required. However, if the clearance is too large, more than 2.5mm, it will lead to the axial movement of the camshaft and increase the wear of the parts. In addition, the change of camshaft position will cause the change of gas distribution phase, which will affect the normal operation of Shandong biogas generator. Therefore, the camshaft should be positioned axially. When the generator is working, it is necessary to adjust the clearance of the camshaft due to the wear and looseness of the parts, or after the removal of the timing gearbox cover, so as to ensure the normal operation of the camshaft. The axial positioning of the generator camshaft is realized by the thrust screw on the gearbox cover. When adjusting, tighten the thrust pin to the end, eliminate the axial clearance, and then return about 1 / 4 turn.

　　不要堵塞发电机曲轴箱的排气口。在发电机的工作过程中，每当活塞下降时，曲轴箱内的气体(包括泄漏出来的气体)受到压缩，曲轴箱内的气体压力增大，引起油底壳接头表面的漏油，对活塞的运动产生阻力。因此，发电机曲轴箱应该有排气口。

　　Do not block the exhaust port of the generator crankcase. In the working process of the generator, whenever the piston drops, the gas in the crankcase (including the leaked gas) is compressed, and the gas pressure in the crankcase increases, which causes the oil leakage on the joint surface of the oil pan and produces resistance to the movement of the piston. Therefore, the generator crankcase should have an exhaust port.

　　不同类型的发电机，曲轴箱的排气位置是不一样的，但其工作原理是一样的，即单向阀的作用原理。当活塞从死点移动到死点时，曲轴箱压力增大，打开阀门，使气体排出;当活塞从底部移动到顶部时，曲轴箱压力随着空间的增大而下降到负压。负压使气门堵塞曲轴箱和外界的通道，防止外界灰尘进入曲轴箱，保持润滑油清洁，并使发电机工作时的润滑油泄漏机会减少。因此，发电机曲轴箱的通风机应保持畅通，以保证曲轴箱的排气。

　　The exhaust position of crankcase is different for different types of generator, but its working principle is the same, that is, the working principle of one-way valve. When the piston moves from the dead point to the dead point, the crankcase pressure increases, and the valve is opened to discharge the gas; when the piston moves from the bottom to the top, the crankcase pressure decreases to the negative pressure with the increase of space. 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 fan of generator crankcase shall be kept unblocked to ensure the exhaust of crankcase.

　　沼气发电机组曲轴失效原因的正确分析

　　The correct analysis of the crankshaft failure of biogas generator set曲轴烧蚀主要是由于曲轴轴颈与轴瓦之间没有形成有效的润滑膜，导致曲轴轴颈与轴瓦之间产生直接的摩擦。当发电机发生曲轴烧蚀时，会发出白烟、金属撞击的奇怪声音，甚至会导致曲轴与轴瓦锁在一起而无法转动。因此，必须正确分析和判断其失效的原因。

　　The main reason of crankshaft ablation is that there is no effective lubricating film between crankshaft journal and bearing bush, which leads to direct friction between crankshaft journal and bearing bush. When the crankshaft of the generator is ablated, it will make a strange sound of white smoke and metal impact, and even lead to the crankshaft and bearing shell locked together and unable to rotate. Therefore, it is necessary to correctly analyze and judge the cause of its failure.

　　一是油品质量差

　　First, the quality of oil products is poor低质量的石油。所选用的油品质量等级和粘度等级较低，或不同品牌的油混合使用，导致油品性能不能满足要求;机油在使用过程中混入大量的粉尘，由于发电机工作温度高，导致机油氧化变质。氧化变质的油呈黑色，变钝，浓度增加，用两指拧油，感觉油变稀。一旦注油泵和润滑油通道可以检查发电机上部是否有水气或水珠。如果石油股票是不够的,将导致发电机润滑油流量不足,然后不能确保发电机可以检查油底壳的油量,油压力表阅读,进一步检查石油管道是否堵塞、泄漏和其他异常现象。

　　Low quality oil. The quality grade and viscosity grade of the selected oil are low, or different brands of oil are mixed, resulting in the performance of the oil can not meet the requirements; a large amount of dust is mixed into the oil during the use process, resulting in the oxidation and deterioration of the oil due to the high working temperature of the generator. The oxidized oil is black, blunt, and the concentration is increased. Screw the oil with two fingers, and the oil becomes thinner. Once the oil pump and lubricating oil channel are filled, check whether there is water vapor or water drop on the upper part of the generator. If the oil stock is not enough, it will lead to insufficient lubricating oil flow of the generator, and then it cannot be ensured that the generator can check the oil volume of the oil pan, read the oil pressure gauge, and further check whether the oil pipeline is blocked, leaked and other abnormal phenomena.

　　曲轴、飞轮、离合器动平衡超差

　　The dynamic balance of crankshaft, flywheel and clutch is out of tolerance当动平衡超差时，曲轴的高速转动产生惯性力，惯性力会破坏曲轴轴颈与轴瓦之间的配合间隙。

　　When the dynamic balance is out of tolerance, the high-speed rotation of crankshaft will produce inertia force, which will destroy the fit clearance between crankshaft journal and bearing bush.

　　故障一般发生在机器运行1万公里后。曲轴烧蚀后，轴颈上残留的碎屑可以清除，动平衡可以再次检查。其不平衡基本上可以代表烧蚀期刊动平衡的超差。

　　The fault usually occurs after the machine runs 10000 km. After the crankshaft is ablated, the residual debris on the journal can be removed and the dynamic balance can be checked again. The unbalance can basically represent the out of tolerance of dynamic balance of ablation journals.

　　维护不当

　　Improper maintenance

　　沼气发电机组运行一段时间后，如不及时、合理地进行维护，将导致油泵限压阀等部件磨损、失效、变形。机油滤芯将机油、泥浆堵塞，使机油压力降低，造成曲轴烧蚀。

　　If the biogas generator unit is not maintained timely and reasonably after a period of operation, it will lead to the wear, failure and deformation of oil pump pressure limiting valve and other components. The engine oil filter element blocks the engine oil and mud, reduces the engine oil pressure and causes the crankshaft to be ablated.