The mine explosion-proof loader is mainly used to shovel soil, sand, lime, coal and other bulk materials, and 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.

在道路、特别是在高等级公路施工中，小铲车用于路基工程的填挖、沥青混合料和水泥混凝土料场的集料与装料等作业。此外还可进行推运土壤、刮平地面和牵引其他机械等作业。

In road construction, especially in high-grade highway construction, small forklifts are used for filling and excavation of subgrade engineering, aggregate and loading of asphalt mixture and cement concrete stockyard. In addition, it can also push and transport soil, scrape the ground and pull other machinery.

装载机主要部件包括发动机，变矩器，变速箱，前、后驱动桥，简称四大件。

The main components of the loader include engine, torque converter, gearbox, front and rear drive axles, which are referred to as the four major parts for short.

变矩器上有三个泵，工作泵（供应举升，翻斗压力油）、转向泵（供应转向压力油）、变速泵也称行走泵（供应变矩器，变速箱压力油），有些机型转向泵上还装有先导泵（供应操纵阀先导压力油）。

There are three pumps on the torque converter, working pump (supply lifting and tipping pressure oil), steering pump (supply steering pressure oil), and variable speed pump, also known as travel pump (supply torque converter and transmission pressure oil). Some models of steering pump are also equipped with pilot pump (supply control valve pilot pressure oil).

变速泵是安装在装载机变速箱上的一种油泵，其为变速箱提供档位压力油和变距器用油，其在长期使用后，变速泵内部的齿轮会把变速泵侧面的的壳体磨损掉，这样就会造成变速泵内部的密封间隙变大，被齿轮排到出油口的油会从磨损的地方回流，使压力降低，使变速泵失去使用价值，影响装载机的使用。

The transmission pump is an oil pump installed on the gearbox of the loader, which provides gear pressure oil and oil for the variator for the gearbox. After long-term use, the gear inside the transmission pump will wear off the shell on the side of the transmission pump, which will cause the sealing gap inside the transmission pump to become larger, and the oil discharged to the oil outlet by the gear will return from the worn place to reduce the pressure, The variable speed pump loses its use value and affects the use of the loader.

变速泵的工作性能直接影响到装载机的工作效率与可靠性，改进变速泵的结构，能提高变速泵的释积效率、改善自吸性能、降低运转噪声、延长使用寿命。

The working performance of variable speed pump directly affects the working efficiency and reliability of loader. Improving the structure of variable speed pump can improve the release efficiency of variable speed pump, improve self-priming performance, reduce operating noise and prolong service life.