The self dropping mixer has a long history. As early as the beginning of the 20th century, the drum concrete mixer driven by the steam engine has begun to appear. After 50's, the double cone mixer of reverse discharge type and tipping discharge type and split drum mixer came out and developed one after another. The inner wall of the mixing drum of the self dropping concrete mixer is provided with the mixing blades arranged radially. During the operation, the mixing drum rotates around its horizontal axis, and the materials in the mixing drum are added. After being lifted to a certain height by the blades, they fall by the self weight, so that they move around again and again to achieve the effect of uniform mixing. The structure of self dropping concrete mixer is simple, and it is mainly used to mix plastic concrete.

强制式搅拌机从20世纪50年代初兴起后，得到了迅速的发展和推广。先出现的是圆盘立轴式强制自上料水泥搅拌车这种搅拌机分为涡桨式和行星式两种。19世纪70年代后，随着轻骨料的应用，出现了圆槽卧轴式强制搅拌机，它又分单卧轴式和双卧轴式两种，兼有自落和强制两种搅拌的特点。其搅拌叶片的线速度小，耐磨性好和耗能少，发展较快。

Since the rise of forced mixer in the early 1950s, it has been developed and popularized rapidly. The first appeared is the disc vertical shaft type forced concrete mixer, which is divided into two types: the turboprop type and the planetary type. After 1870's, with the application of lightweight aggregate, the forced mixer with horizontal shaft and round trough appeared. It is divided into single horizontal shaft type and double horizontal shaft type, and has the characteristics of self dropping and forced mixing. It has the advantages of low linear speed, good wear resistance, low energy consumption and rapid development.

强制式自上料水泥搅拌车拌筒内的转轴臂架上装有搅拌叶片，加入拌筒内的物料，在搅拌叶片的强力搅动下，形成交叉的物流。这种搅拌方式远比自落搅拌方式作用强烈，主要适于搅拌干硬性混凝土。连续式自上料水泥搅拌车装有螺旋状搅拌叶片，各种材料分别按配合比经连续称量后送入搅拌机内，搅拌好的混凝土从卸料端连续向外卸出。这种搅拌机的搅拌时间短，生产率高、其发展引人注目。

A mixing blade is installed on the rotating arm of the mixing drum of the forced concrete mixer, and the materials in the mixing drum are added. Under the strong agitation of the mixing blade, the cross logistics is formed. This kind of mixing method is far stronger than the self dropping mixing method, and is mainly suitable for mixing dry and hard concrete. The continuous concrete mixer is equipped with spiral mixing blades. Various materials are weighed continuously according to the mix proportion and then sent into the mixer. The mixed concrete is discharged from the discharge end continuously. The mixer has the advantages of short mixing time, high productivity and remarkable development.

随着混凝土材料和施工工艺的发展、又相继出现了许多新型结构的自上料水泥搅拌车,如蒸汽加热式搅拌机,超临界转速搅拌机，声波搅拌机，无搅拌叶片的摇摆盘式搅拌机和二次搅拌的自上料水泥搅拌车等。

With the development of concrete materials and construction technology, many new types of concrete mixers have emerged in succession, such as steam heated mixers, supercritical speed mixers, acoustic mixers, swaying plate mixers without mixing blades and concrete mixers with secondary mixing, etc.

连续式自上料水泥搅拌车装有螺旋状搅拌叶片，各种材料分别按配合比经连续称量后送入搅拌机内，搅拌好的混凝土从卸料端连续向外卸出。这种搅拌机的搅拌时间短，生产率高、其发展引人注目。随着混凝土材料和施工工艺的发展、又相继出现了许多新型结构的自上料水泥搅拌车,如蒸汽加热式搅拌机,超临界转速搅拌机，声波搅拌机，无搅拌叶片的摇摆盘式搅拌机和二次搅拌的自上料水泥搅拌车等。

The continuous concrete mixer is equipped with spiral mixing blades. Various materials are weighed continuously according to the mix proportion and then sent into the mixer. The mixed concrete is discharged from the discharge end continuously. The mixer has the advantages of short mixing time, high productivity and remarkable development. With the development of concrete materials and construction technology, many new types of concrete mixers have emerged in succession, such as steam heated mixers, supercritical speed mixers, acoustic mixers, swaying plate mixers without mixing blades and concrete mixers with secondary mixing, etc.