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.

普通的攪拌罐用來運(yùn)送建筑用混凝土的專用卡車；由于它的外形，也常被稱為田螺車。這類卡車上都裝置圓筒型的攪拌筒以運(yùn)載混合后的混凝土。

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.

混凝土攪拌罐所裝運(yùn)的混凝土含水量來分，有濕料式、干料式和半干料式三種攪拌運(yùn)輸。國內(nèi)大多采用濕料式的，它可裝運(yùn)由攪拌廠（站）生產(chǎn)的混凝土或按配比混合的骨料（砂、石子）、水泥和水，在運(yùn)輸過程中，不斷對(duì)濕料慢慢攪拌，防止混凝土在運(yùn)輸過程中初凝和離析。但是，混凝土從生產(chǎn)到澆注的時(shí)間一般不能超過1.5h,以免混凝土凝結(jié)。所以，在更遠(yuǎn)距離運(yùn)輸?shù)那闆r下，需采用干料和半干料攪拌運(yùn)輸車來運(yùn)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.

干料式攪拌運(yùn)輸車可按配比將干狀骨料和水泥直接裝入該車的攪拌筒內(nèi)，在運(yùn)輸過程中筒內(nèi)的干料進(jìn)行攪拌，當(dāng)車輛將要到達(dá)施工場(chǎng)地或在施工場(chǎng)地再加水完成混凝土的攪拌。半干料式攪拌運(yùn)輸車所裝運(yùn)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，但水的含量達(dá)不到澆注要求，需在車輛將要達(dá)到施工場(chǎng)地或在施工場(chǎng)地加水?dāng)嚮炷翑嚢柢囉衅嚨妆P、攪拌筒、進(jìn)出料裝置、供水系統(tǒng)和液壓傳動(dòng)系統(tǒng)等組成。

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.

攪拌筒的主要作用是儲(chǔ)存和攪拌混凝土，安裝在汽車車架的后半部，主要由筒體、連接法蘭、滾道及攪拌葉片組成。攪拌筒的外部結(jié)構(gòu)大多是兩端錐體、中間為圓柱體，其外形酷似橄欖。混凝土儲(chǔ)罐由優(yōu)良耐磨薄鋼板制成，為了能夠自動(dòng)裝、卸混凝土，其內(nèi)壁焊有特殊形狀的螺旋葉片。

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.