Automatic feeding mixer is a kind of mixing equipment which combines the functions of concrete truck and concrete mixing station, integrates concrete loading, metering, mixing and discharging, and can realize concrete transportation and on-site concrete construction. The equipment is fast, high-energy and greatly improves the production efficiency, The production time and cost are reduced, and the automatic feeding mixing tank is suitable for concrete engineering construction in various special environments, crowded urban areas and remote areas.

普通的搅拌罐用来运送建筑用混凝土的专用卡车；由于它的外形，也常被称为田螺车。这类卡车上都装置圆筒型的搅拌筒以运载混合后的混凝土。

Ordinary mixing tank is a special truck used to transport construction concrete; Because of its shape, it is also often called snail car. This kind of truck is equipped with cylindrical mixing drum to carry the mixed concrete.

混凝土搅拌罐所装运的混凝土含水量来分，有湿料式、干料式和半干料式三种搅拌运输。国内大多采用湿料式的，它可装运由搅拌厂（站）生产的混凝土或按配比混合的骨料（砂、石子）、水泥和水，在运输过程中，不断对湿料慢慢搅拌，防止混凝土在运输过程中初凝和离析。但是，混凝土从生产到浇注的时间一般不能超过1.5h,以免混凝土凝结。所以，在更远距离运输的情况下，需采用干料和半干料搅拌运输车来运送。

The water content of concrete transported by concrete mixing tank can be divided into wet material type, dry material type and semi dry material type. Wet material type is mostly used in China. It can transport concrete produced by mixing plant (station) or aggregate (sand, stone), cement and water mixed according to proportion. During transportation, wet material is continuously mixed slowly to prevent initial setting and segregation of concrete during transportation. However, the time from production to pouring should not exceed 1.5h to avoid concrete setting. Therefore, in the case of longer distance transportation, the dry and semi dry material mixing truck should be used for transportation.

干料式搅拌运输车可按配比将干状骨料和水泥直接装入该车的搅拌筒内，在运输过程中筒内的干料进行搅拌，当车辆将要到达施工场地或在施工场地再加水完成混凝土的搅拌。半干料式搅拌运输车所装运的混凝土中的骨料和水泥也是按配比配制的，并含有一定的水，但水的含量达不到浇注要求，需在车辆将要达到施工场地或在施工场地加水搅混凝土搅拌车有汽车底盘、搅拌筒、进出料装置、供水系统和液压传动系统等组成。

The dry material mixer truck can directly load the dry aggregate and cement into the mixing drum of the truck according to the proportion. During the transportation, the dry material in the drum is mixed. When the truck is about to arrive at the construction site or in the construction site, water is added to complete the concrete mixing. The aggregate and cement in the concrete transported by the semi dry material mixer truck are also prepared according to the proportion, and contain a certain amount of water, but the water content can not meet the pouring requirements, so it is necessary to add water to the construction site or the construction site. The mixer truck is composed of car chassis, mixing drum, feeding and discharging device, water supply system and hydraulic transmission system.

搅拌筒的主要作用是储存和搅拌混凝土，安装在汽车车架的后半部，主要由筒体、连接法兰、滚道及搅拌叶片组成。搅拌筒的外部结构大多是两端锥体、中间为圆柱体，其外形酷似橄榄。混凝土储罐由优良耐磨薄钢板制成，为了能够自动装、卸混凝土，其内壁焊有特殊形状的螺旋叶片。

The main function of the mixing drum is to store and mix concrete. It is installed in the rear half of the car frame and is mainly composed of the drum, connecting flange, raceway and mixing blade. The external structure of the mixing drum is mostly cone at both ends and cylinder in the middle, and its shape is similar to olive. The concrete storage tank is made of excellent wear-resistant steel sheet. In order to automatically load and unload concrete, the inner wall of the tank is welded with spiral blades of special shape.