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.

装载机主要用于空间狭窄的洞采作业的磷矿、铁矿、铜矿、金矿、银矿、铅锌矿、煤矿巷道等各种矿山、水电、隧道工程的碎石土料采集及输送施工装车。下面是关于矿用装载机发动机缸盖变形的处理方法。

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.

由于发动机缸盖长期工作在高温、高压、热负荷和交变载荷环境下而发生翘曲变形，气缸垫从水道口处冲坏，造成燃烧室压力下降、发动机动力不足和散热器加水口往外冒水。

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.

发动机缸盖变形的处理方法是：由于该机盖上无燃烧室凹形，不必考虑燃烧容积的变化（燃烧室容积的变化值一般不应大于原容积的4%），采用平面铣削的方法加工了缸盖平面；在缸盖与缸体接合面的水道口处安装了一紫铜垫（该铜垫的厚度为水道口凹台厚度的1.2倍），代替气缸垫上的橡胶密封圈，然后安装气缸垫，同时采用先冷紧后热紧的方法坚固缸盖螺栓。用此方法修复的发动机，再未出现过冲缸垫的故障。

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.