We all know that the tunnel loader brings us a lot of convenience, but it will also do great harm if it is not operated properly. Let's explain it to you below:

隧道装载机启动时刚启动就猛轰油门：发动机刚启动时，机身温度低、机油黏度大、流动性差，机油在短时间内不能畅流各润滑点。如果此时猛轰油门，会导致发动机转速瞬时升高，尽管机油泵的供油量和压力也会增加，但瞬间不能满足各运动副对润滑油量和油压的要求，运动副不能建立很好的润滑油膜，产生瞬间干摩擦，导致剧烈磨损。

When the tunnel loader is started, it slams the accelerator as soon as it is started: when the engine is just started, the body temperature is low, the oil viscosity is large, and the fluidity is poor, so the oil can not flow smoothly to all lubrication points in a short time. If the accelerator is slammed at this time, the engine speed will increase instantaneously. Although the oil supply and pressure of the oil pump will also increase, it can not meet the requirements of each moving pair for lubricating oil quantity and oil pressure. The moving pair can not establish a good lubricating oil film, resulting in instantaneous dry friction, resulting in severe wear.

隧道装载机各运动副润滑不良，运行阻力也会增大，如果猛轰油门，活塞、连杆、曲轴会产生剧烈撞击，加速机件的损坏。此外，对配有涡轮增压器的柴油机，极易因不良润滑而破坏油封，导致涡轮增压器故障，降低柴油机功率。因此，装载机启动后，应平稳低速运转，严禁轰油门。

The motion pairs of the tunnel loader are poorly lubricated and the running resistance will increase. If the accelerator is slammed, the piston, connecting rod and crankshaft will collide violently and accelerate the damage of the parts. In addition, for diesel engines equipped with turbochargers, it is very easy to damage the oil seal due to poor lubrication, resulting in turbocharger failure and reducing the power of diesel engines. Therefore, after the loader is started, it shall run smoothly and at a low speed, and it is strictly prohibited to blow the accelerator.

隧道装载机作业过程中补充冷却水冷却水不足，将导致柴油机缺水过热。直接补充冷却水，整个冷却系统瞬间会产生大的温差，使缸盖、缸套、缸体等瞬间脆裂，产生微裂纹，逐渐渗漏冷却水，以致漏油、漏气。因此，当柴油机温度过高时，应以稍高转速空载运转，待水温下降50℃左右时，再熄火，拧松散热器盖，排出水蒸气，缓慢注入冷却水。

During the operation of tunnel loader, insufficient supplementary cooling water will lead to water shortage and overheating of diesel engine. When the cooling water is directly supplemented, the whole cooling system will produce a large temperature difference in an instant, which will make the cylinder head, cylinder liner and cylinder block brittle and produce microcracks, and gradually leak the cooling water, resulting in oil and air leakage. Therefore, when the temperature of the diesel engine is too high, it should run at a slightly higher speed without load. When the water temperature drops to about 50 ℃, turn off the engine, loosen the radiator cap, discharge water vapor and slowly inject cooling water.

带负荷停机隧道装载机或作业后立即停机装载机带负荷停机或作业后立即停机，冷却系统随即停止工作，散热能力急剧下降。工作产生的大量热量不能及时散发，使受热部件的冷却水沸腾，机件过热，高温烧蚀。同时还会使附着其表面的机油变质，造成下次启动困难。

Stop the tunnel loader with load or immediately after operation. When the loader stops with load or immediately after operation, the cooling system stops working immediately, and the heat dissipation capacity decreases sharply. A large amount of heat generated by work cannot be dissipated in time, which makes the cooling water of heated parts boil, the parts overheat and ablate at high temperature. At the same time, it will also deteriorate the oil attached to its surface, resulting in difficulty in starting next time.

此外，隧道装载机带增压的柴油机，若突然停机，会使增压器升温600℃左右，易造成密封环损坏。因此，装载机在熄火前应卸除负荷，并空载运转3～5 min，使机温降40℃以下，水温降50℃以下时，方可停机。

In addition, if the supercharged diesel engine of tunnel loader stops suddenly, the supercharger will rise to about 600 ℃, which is easy to cause damage to the sealing ring. Therefore, before flameout, the loader shall unload the load and operate without load for 3 ~ 5 minutes to reduce the machine temperature to below 40 ℃ and the water temperature to below 50 ℃.

停机前猛轰油门不少驾驶员误认为停机前猛轰几脚油门，可使多余未燃烧的柴油留在气缸中，以利于下一次启动。其实这会造成燃烧不完全、冒黑烟、积炭增多;同时猛轰几脚油门会使运动件惯性力突然增大，加剧运动副的磨损;其次未燃尽的燃油将顺着缸壁流入油底壳稀释机油，缩短机油使用周期。因此，正确的操作是，无负荷状态下中低速平稳运转后停机。

Slamming the throttle before shutdown many drivers mistakenly believe that slamming a few feet of throttle before shutdown can leave excess unburned diesel in the cylinder for the next start. In fact, this will cause incomplete combustion, black smoke and increased carbon deposition; At the same time, slamming several foot throttle will suddenly increase the inertia force of moving parts and aggravate the wear of moving pairs; Secondly, the unburned fuel will flow into the oil pan along the cylinder wall to dilute the oil and shorten the service life of the oil. Therefore, the correct operation is to shut down after smooth operation at medium and low speed under no-load state.

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