The power take-off on the concrete mixer is a gear set that can transfer the power of the power system of the concrete mixer to the additional device. Power take-off is also called power output device, abbreviated as PTO, is the acronym of English powertakeoff. It is not only on the concrete mixer truck, such as the gear pump of dump truck, hydraulic motor of mixer, water pump of fire truck and compressor of refrigeration truck, but also the power transfer is realized through power take-off.

取力器分类主要是按照分类方式的不同来区分：一种是按终功率输出形式来分；还有一种就是按取力器本身结构的档位来分。

The classification of power take-off is mainly divided according to different classification methods: one is according to the final power output form; the other is according to the gear of the power take-off structure.

发动机后端取力（PTO1）：发动机后端取力一般都是在飞轮处，它优点是不受主离合器控制，但因改变了曲轴未端的结构，对于平衡会有一些影响。这种取力形式的应用大家比较熟悉的就是水泥搅拌机。取力器装在离合器外壳上且在不同工况下搅拌滚筒的旋转方向不同。在进料和运输过程正向旋转，出料反向旋转，工作结束切断与发动机动力连接。

Power take-off at the rear end of engine (pto1): the power take-off at the rear end of engine is generally at the flywheel. Its advantage is that it is not controlled by the main clutch. However, due to the change of the structure at the end of the crankshaft, there will be some impact on the balance. The application of this kind of force taking form is familiar with cement mixer. The power take-off is installed on the clutch shell and the rotation direction of the mixing drum is different under different working conditions. In the process of feeding and transportation, forward rotation, discharge reverse rotation, cut off the power connection with the engine.

发动机前端取力（PTO2）通常是曲轴连接，一般都是由正时齿轮室或由风扇、水泵的皮带轮输出。例如气刹制动系统中的气泵，某些专用工作装置所用的液压马达等。由于该方式的取力器到附加装置的距离较长，且需要转换传动方向，若采用机械传动其结构就很复杂，因此一般采用液压传动。

The front-end power take-off (PtO2) of the engine is usually connected by the crankshaft, and is generally output by the timing gear chamber or the belt pulley of the fan and water pump. For example, the air pump in the air brake system, the hydraulic motor used in some special working devices, etc. Because the distance between the power take-off device and the additional device is long and the transmission direction needs to be changed, if mechanical transmission is adopted, its structure is very complex, so hydraulic transmission is generally adopted.

按照取力器本身结构的档位来分的话，主要分为中置取力器和后置取力器。

According to the structure of the power take-off, it can be divided into central power take-off and rear power take-off.