服務(wù)熱線電話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高壓油管管夾位置不當(dāng)或松脫
A high-pressure oil pipe clamp is improperly positioned or loose
裝配時，管夾所處的位置不正確或管夾松脫、漏裝，都會降低高壓油管的安裝剛度，使高壓油管固有的振動頻率降低，當(dāng)高壓油管振動的固有頻率與柴油機振動頻率相同時，就會使高壓油管產(chǎn)生共振現(xiàn)象，發(fā)生大幅度振動而使高壓油管中部或兩端發(fā)生疲勞斷裂。
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油管在修復(fù)、裝配過程中，強行彎曲，使高壓油管在急彎處產(chǎn)生應(yīng)力，由于噴油時產(chǎn)生周期振動而發(fā)生疲勞斷裂；油管外部磨損或制造時有內(nèi)部裂紋，在使用中由于工作壓力較高（一般在20Mpa左右），引起油管因裂紋而斷裂。巷道裝載機ZL928排氣冒黑煙的原因及排除方法
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
礦井裝載機發(fā)動機在有負荷工作時，排氣煙色一般為淡灰色。柴油機在超載、突然加速、爬坡或大負荷工作時，排氣冒黑煙是正常的。但是在空負荷或小負荷狀態(tài)下冒黑煙或大負荷時冒黑煙過重，則屬不正?，F(xiàn)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空氣濾清器堵塞，引起氣缸充氣不足，應(yīng)清理或更換空氣濾清器濾芯；
(1) The air filter element shall be cleaned or replaced if the air filter is blocked, causing insufficient inflation of the cylinder;
㈡增壓器有故障，引起供氣壓力不足，使柴油機燃燒不完全，應(yīng)檢修增壓器；
The second supercharger is faulty, which causes insufficient air supply pressure and incomplete combustion of the diesel engine. The supercharger should be repaired;
㈢噴油器霧化或有滴油現(xiàn)象，應(yīng)檢修效驗噴油器，必要時更換噴油頭（針閥偶件）
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供油時間調(diào)整不當(dāng)，有以下兩種：
IV. Improper adjustment of fuel supply time:
a.排氣管冒黑煙，同時氣缸內(nèi)伴有清脆的敲擊聲，工作粗暴。出現(xiàn)這種現(xiàn)象一般是供油時間過早引起的。供油時間過早，通常還會引起起動困難。
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.排氣管冒黑煙，同時消聲器內(nèi)有火焰，聲音沉悶。出現(xiàn)這種現(xiàn)象則為供油時間過晚所致。供油時間過晚，常引起柴油機過熱，排溫升高，甚可能燒壞機件。
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，帶有供油角度自動提前器的柴油機在高速時冒黑煙，也可能是因為供油角度自動提前器損壞所致，應(yīng)拆檢供油角度自動提前器。供油時間不當(dāng)，則可按前述方法檢查、調(diào)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
排氣管冒黑煙，同時機器振動嚴(yán)重，為個別氣缸供油太多，可用“斷缸法”予以檢查排除；
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柴油質(zhì)量差
VI. Poor diesel quality
柴油質(zhì)量差，引起霧化，以致不能完全燃燒，應(yīng)清洗油箱，更換柴油
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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