服务热线电话The fracture of diesel high-pressure fuel pipe of mine loader is mainly caused by the internal stress produced during assembly and the bending fatigue damage caused by high-frequency vibration. The main reasons are:
㈠高压油管管夹位置不当或松脱
A high-pressure oil pipe clamp is improperly positioned or loose
装配时，管夹所处的位置不正确或管夹松脱、漏装，都会降低高压油管的安装刚度，使高压油管固有的振动频率降低，当高压油管振动的固有频率与柴油机振动频率相同时，就会使高压油管产生共振现象，发生大幅度振动而使高压油管中部或两端发生疲劳断裂。
When assembling, the incorrect position of the pipe clamp or the loose or missing pipe clamp will reduce the installation stiffness of the high-pressure fuel pipe and reduce the natural vibration frequency of the high-pressure fuel pipe. When the natural frequency of the high-pressure fuel pipe is the same as that of the diesel engine, the high-pressure fuel pipe will have resonance, and large amplitude vibration will cause fatigue fracture in the middle or both ends of the high-pressure fuel pipe.
㈡油管在修复、装配过程中，强行弯曲，使高压油管在急弯处产生应力，由于喷油时产生周期振动而发生疲劳断裂；油管外部磨损或制造时有内部裂纹，在使用中由于工作压力较高（一般在20Mpa左右），引起油管因裂纹而断裂。巷道装载机ZL928排气冒黑烟的原因及排除方法
During the repair and assembly of the second oil pipe, the high-pressure oil pipe was forced to bend, causing stress at the sharp bend, and fatigue fracture due to periodic vibration during oil injection; The tubing is worn externally or has internal cracks during manufacturing. The tubing is broken due to cracks due to high working pressure (generally about 20Mpa) during use. Reasons and elimination methods of exhaust black smoke of roadway loader ZL928
矿井装载机发动机在有负荷工作时，排气烟色一般为淡灰色。柴油机在超载、突然加速、爬坡或大负荷工作时，排气冒黑烟是正常的。但是在空负荷或小负荷状态下冒黑烟或大负荷时冒黑烟过重，则属不正常现象，其原因及排除方法如下：
When the mine loader engine is working under load, the exhaust smoke color is generally light gray. It is normal for the diesel engine to emit black smoke during overload, sudden acceleration, climbing or heavy load operation. However, it is abnormal to emit black smoke under empty load or small load, or to emit too much black smoke under heavy load. The causes and troubleshooting are as follows:
㈠空气滤清器堵塞，引起气缸充气不足，应清理或更换空气滤清器滤芯；
(1) The air filter element shall be cleaned or replaced if the air filter is blocked, causing insufficient inflation of the cylinder;
㈡增压器有故障，引起供气压力不足，使柴油机燃烧不完全，应检修增压器；
The second supercharger is faulty, which causes insufficient air supply pressure and incomplete combustion of the diesel engine. The supercharger should be repaired;
㈢喷油器雾化或有滴油现象，应检修效验喷油器，必要时更换喷油头（针阀偶件）
In case of atomization or oil dripping of the third injector, the injector shall be repaired and verified, and the injector head (needle valve coupling) shall be replaced if necessary
㈣供油时间调整不当，有以下两种：
IV. Improper adjustment of fuel supply time:
a.排气管冒黑烟，同时气缸内伴有清脆的敲击声，工作粗暴。出现这种现象一般是供油时间过早引起的。供油时间过早，通常还会引起起动困难。
A. The exhaust pipe emits black smoke, and the cylinder is accompanied by a crisp knocking sound, resulting in rough operation. This phenomenon is generally caused by the premature fuel supply time. If the fuel supply time is too early, it will usually cause difficulty in starting.
b.排气管冒黑烟，同时消声器内有火焰，声音沉闷。出现这种现象则为供油时间过晚所致。供油时间过晚，常引起柴油机过热，排温升高，甚可能烧坏机件。
b. The exhaust pipe emits black smoke, and there is flame in the muffler, so the sound is dull. This phenomenon is caused by the late fuel supply time. If the fuel supply time is too late, the diesel engine will be overheated, the exhaust temperature will rise, and even the engine parts may be burnt.
另外，带有供油角度自动提前器的柴油机在高速时冒黑烟，也可能是因为供油角度自动提前器损坏所致，应拆检供油角度自动提前器。供油时间不当，则可按前述方法检查、调整。
In addition, the diesel engine with the automatic fuel supply angle advancer emits black smoke at high speed, which may also be caused by the damage of the automatic fuel supply angle advancer. The automatic fuel supply angle advancer should be disassembled and inspected. If the oil supply time is improper, it can be checked and adjusted according to the above method.
㈤各缸供油不均
The oil supply of each cylinder is uneven
排气管冒黑烟，同时机器振动严重，为个别气缸供油太多，可用“断缸法”予以检查排除；
The exhaust pipe emits black smoke. At the same time, the machine vibrates severely and supplies too much oil to individual cylinders. The "cylinder breaking method" can be used to check and eliminate it;
㈥柴油质量差
VI. Poor diesel quality
柴油质量差，引起雾化，以致不能完全燃烧，应清洗油箱，更换柴油
The quality of diesel oil is poor, which causes atomization, so that it cannot be completely burned. Clean the oil tank and replace the diesel oil
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