In fact, the development process of concrete mixer truck is the epitome of human progress and the development of construction industry.
人类早的建筑就是用树枝和石头搭建而成的，后来又出现了用泥土筑成的建筑，这些建筑的材料都比较单一。
The earliest human buildings were made of branches and stones. Later, buildings made of soil appeared. The materials of these buildings are relatively single.
后来随着社会的进步和技术的发展，为了让建筑更加坚固，开始使用较复杂的建筑材料，例如混凝土。
Later, with the progress of society and the development of technology, in order to make the building more solid, more complex building materials, such as concrete, were used.
这也就需要使用工具来将由多种材料制成的混凝土混合搅拌，在20世纪初混凝土刚出现时，使用搅拌混凝土还是用人工搅拌这种较原始的方法，不但费体力而且效率还低，混凝土也是就地搅拌后使用，并不会长距离运输。
This requires the use of tools to mix and mix the concrete made of various materials. When the concrete first appeared in the early 20th century, the more primitive method of mixing concrete or manual mixing is not only labor-intensive but also inefficient. The concrete is also used after local mixing and will not be transported for a long distance.
混凝土车为什么要一直转？因为不转就闷罐，闷罐损失就上万
Why does the concrete truck keep turning? Because if you don't turn, the tank will be stuffy, and the loss of stuffy tank will be tens of thousands
到了20世纪70年代，出现了用电带动固定式混凝土搅拌机，并且会用小推车来短距离运输混凝土，效率也就提高了很多。
By the 1970s, there was a fixed concrete mixer driven by electricity, and it could transport concrete in short distance with trolleys, which greatly improved the efficiency.
世纪80年代，出现了用卡车拉着的移动式搅拌机。
In the 1980s, mobile mixers pulled by trucks appeared.
混凝土车为什么要一直转？因为不转就闷罐，闷罐损失就上万
Why does the concrete truck keep turning? Because if you don't turn, the tank will be stuffy, and the loss of stuffy tank will be tens of thousands
世纪90年代，开始将卡车与混凝土罐结合在一起，这就可以长距离运输混凝土了，并且装卸都实现了自动化，混凝土搅拌车也得到了快速的发展。
In the 1990s, trucks and concrete tanks began to be combined, so that concrete can be transported for a long distance, loading and unloading have been automated, and concrete mixer has also developed rapidly.
因为混凝土是由石头，砂子，水泥和水组成，如果运输过程中不转，并且不停的颠簸，石头就会下沉到下，砂子在中间，水泥和水在上面，等运输到目的地就会出现结块的现象，也是我们常说的闷罐。
Because concrete is composed of stone, sand, cement and water, if it doesn't rotate and bumps constantly during transportation, the stone will sink to the bottom, the sand is in the middle, and the cement and water are on the top. When it is transported to the destination, there will be caking, which is also what we often call a stuffy tank.
混凝土车为什么要一直转？因为不转就闷罐，闷罐损失就上万
Why does the concrete truck keep turning? Because if you don't turn, the tank will be stuffy, and the loss of stuffy tank will be tens of thousands
因此，转动既可以防止混凝土凝固，又可防止混凝土分层，而且还可以让混凝土混合得更均匀。
Therefore, rotation can not only prevent concrete solidification, but also prevent concrete delamination, but also make concrete mix more evenly.
