装载机是在轮式或履带式底盘上装有带铲斗工作装置的机械。 20世纪60 年代以前的装载机，其功率和结构强度均不大，主要用于装载和搬运松散物料。山东永保机械生产的的装载机无论在结构、传动、材料和轮胎等方面都有了改进和提高，许多轮式装载机已能用于露天矿、采石场和隧道等工程中。装载机不仅可进行土方工程作业，而且更换工作装置后可以成为起重机或叉车等机械，同时还可以作牵引车用，是一种适应性较强的一机多用的工程机械。装载机的主参数是额定装载重量。我国已经制定了轮胎式装载机产品系列和基本技术参数的标准。
Shandong is a mechanical bucket loader working device on wheeled or tracked chassis fitted with. 1960s before loaders, its power and structural strength are not large, mainly used for loading and transporting loose material. Shandong forever loader machinery production in terms of structure, transmission, materials and other aspects of the tire to improve and enhance many of wheel loaders have been able to open pit, quarries and tunnels and other projects. Loader not only earthwork operations, and after the replacement unit can become a crane or forklift and other machinery, but also can be used for towing, is an adaptation of a strong multi-purpose machine construction machinery. Main parameters of the loader is rated load weight. China has developed a series of wheel loaders products and standard basic technical parameters.
装载机按行走装置分为轮胎式和履式两类；按车架结构的不同分为整体式和铰接式；按工作装置结构的不同分为有铲斗托架式和无铲斗托架式。此外，按卸载方式，又可分为前卸式、后卸式、侧卸式和回转式四种。最普通的是轮胎、铰接、无铲斗托架、反转六连杆机构前卸式单斗装载机，如 ZL50 型。
Divided by walking device loader tire type and shoe type categories; different frame structure into the overall style and articulated; different structure divided into a working device bucket and non-bucket style bracket bracket-style . In addition, according to uninstall the way, can be divided into pre-dump after dump, side dump and rotary four. The most common is the tires, hinged, no bucket bracket, reversing the first six linkage detachable single bucket loaders, such as ZL50 type.