Since the beginning of the 20th century, drum type concrete mixer driven by steam engine began to appear. After the 1950s, the double cone mixer with reverse discharge and tilting discharge and the split drum mixer came out and developed one after another. There are mixing blades arranged radially on the inner wall of the mixing drum of the self falling concrete mixer. During the operation, the mixing drum rotates around its horizontal axis, and the materials added into the mixing drum are lifted to a certain height by the blades, and then fall by its own weight, thus achieving the effect of uniform mixing. The structure of self falling concrete mixer is simple, and plastic concrete is the main mixing material.
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混凝土搅拌机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 emergence of forced mixer in the early 1950s, it has been rapidly developed and popularized. First appeared is the disk vertical shaft type forced concrete mixer, this mixer is divided into two types: vortex paddle type and planetary type. After 1870's, with the application of lightweight aggregate, the forced mixer with round trough horizontal shaft appeared. It can be divided into single horizontal shaft type and double horizontal shaft type. It has the characteristics of self falling and forced mixing. The mixing blade has the advantages of low linear speed, good wear resistance and less energy consumption.
强制式混凝土搅拌机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。连续式混凝土搅拌机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。
The rotating shaft boom in the mixing drum of the forced concrete mixer is equipped with mixing blades. The materials added into the mixing drum form cross logistics under the strong stirring of the mixing blades. This kind of mixing method is much stronger than the self falling mixing method, and is mainly suitable for mixing dry hard concrete. The continuous concrete mixer is equipped with spiral mixing blades. Various materials are continuously weighed according to the mix proportion and sent into the mixer. The mixed concrete is continuously discharged from the discharge end. This kind of 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混凝土搅拌机,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混凝土搅拌机等。
With the development of concrete materials and construction technology, many new types of concrete mixers have emerged, such as steam heating mixer, supercritical speed mixer, sonic mixer, swing disc mixer without mixing blades and secondary mixing concrete mixer.
连续式混凝土搅拌机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。
The continuous concrete mixer is equipped with spiral mixing blades. Various materials are continuously weighed according to the mix proportion and sent into the mixer. The mixed concrete is continuously discharged from the discharge end. This kind of 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混凝土搅拌机,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混凝土搅拌机等。
With the development of concrete materials and construction technology, many new types of concrete mixers have emerged, such as steam heating mixer, supercritical speed mixer, sonic mixer, swing disc mixer without mixing blades and secondary mixing concrete mixer.
