Loader is a kind of earthwork construction machinery widely used in highway, railway, construction, hydropower, port, mine and other construction projects. It is mainly used to shovel soil, sand, lime, coal and other bulk materials. It can also be used for light shovel excavation of ore and hard soil. Changing different auxiliary working devices can also carry out bulldozing, lifting and loading and unloading of other materials such as wood. As the underground loader has the advantages of fast operation speed, high efficiency, good mobility and light operation, it has become one of the main types of earthwork construction in engineering construction.

裝載機(jī)主要用于空間狹窄的洞采作業(yè)的磷礦、鐵礦、銅礦、金礦、銀礦、鉛鋅礦、煤礦巷道等各種礦山、水電、隧道工程的碎石土料采集及輸送施工裝車(chē)。下面是關(guān)于礦用裝載機(jī)發(fā)動(dòng)機(jī)缸蓋變形的處理方法。

The loader is mainly used for the collection, transportation, construction and loading of crushed stone and soil materials in various mines, hydropower and tunnel projects such as phosphate ore, iron ore, copper mine, gold mine, silver mine, lead-zinc mine, coal mine roadway and so on. The following is the treatment method for the deformation of engine cylinder head of mine loader.

由于發(fā)動(dòng)機(jī)缸蓋長(zhǎng)期工作在高溫、高壓、熱負(fù)荷和交變載荷環(huán)境下而發(fā)生翹曲變形，氣缸墊從水道口處沖壞，造成燃燒室壓力下降、發(fā)動(dòng)機(jī)動(dòng)力不足和散熱器加水口往外冒水。

As the engine cylinder head is warped and deformed under the environment of high temperature, high pressure, thermal load and alternating load for a long time, the cylinder gasket is washed out from the water channel mouth, resulting in the decrease of combustion chamber pressure, insufficient engine power and water gushing from the radiator water inlet.

發(fā)動(dòng)機(jī)缸蓋變形的處理方法是：由于該機(jī)蓋上無(wú)燃燒室凹形，不必考慮燃燒容積的變化（燃燒室容積的變化值一般不應(yīng)大于原容積的4%），采用平面銑削的方法加工了缸蓋平面；在缸蓋與缸體接合面的水道口處安裝了一紫銅墊（該銅墊的厚度為水道口凹臺(tái)厚度的1.2倍），代替氣缸墊上的橡膠密封圈，然后安裝氣缸墊，同時(shí)采用先冷緊后熱緊的方法堅(jiān)固缸蓋螺栓。用此方法修復(fù)的發(fā)動(dòng)機(jī)，再未出現(xiàn)過(guò)沖缸墊的故障。

The treatment method of engine cylinder head deformation is: since there is no combustion chamber concave shape on the engine cover, it is not necessary to consider the change of combustion volume (the change value of combustion chamber volume should generally not be greater than 4% of the original volume), and the plane of cylinder head is machined by plane milling; A red copper pad (the thickness of the copper pad is 1.2 times of the thickness of the concave platform of the water channel port) is installed at the water channel port of the joint surface between the cylinder head and the cylinder block to replace the rubber sealing ring on the cylinder pad, and then install the cylinder pad. At the same time, the method of cold tightening first and then hot tightening is used to firm the cylinder head bolts. The engine repaired by this method has no fault of overshoot cylinder gasket.