The concrete mixer truck is composed of an automobile chassis and a special device for concrete mixing and transportation. The chassis of concrete mixer trucks produced in China mostly adopts class II general chassis provided by vehicle manufacturers. Its special mechanism mainly includes power takeoff, front and rear supports of mixing drum, reducer, hydraulic system, mixing drum, operating mechanism, cleaning system, etc. The working principle is that the power of the automobile chassis is taken out through the power take-off device, and the variable pump of the hydraulic system is driven to convert the mechanical energy into hydraulic energy and transmit it to the quantitative motor. The motor then drives the reducer, and the reducer drives the mixing device to mix the concrete.

结构原理

Structural principle

取力装置

Power take-off device

国产混凝土搅拌运输车采用主车发动机取力方式。取力装置的作用是通过操纵取力开关将发动机动力取出，经液压系统驱动搅拌筒，搅拌筒在进料和运输过程中正向旋转，以利于进料和对混凝土进行搅拌，在出料时反向旋转，在工作终结后切断与发动机的动力联接。

The domestic concrete mixer truck adopts the power take-off mode of main vehicle engine. The function of the power take-off device is to take out the power of the engine by operating the power take-off switch and drive the mixing drum through the hydraulic system. The mixing drum rotates forward during feeding and transportation, so as to facilitate feeding and mixing of concrete, rotate reversely during discharging, and cut off the power connection with the engine after work.

液压系统

Hydraulic system

将经取力器取出的发动机动力，转化为液压能（排量和压力），再经马达输出为机械能（转速和扭矩），为搅拌筒转动提供动力。

The engine power taken out by the power takeoff is converted into hydraulic energy (displacement and pressure), and then output into mechanical energy (speed and torque) by the motor to provide power for the rotation of the mixing drum.

减速机

Reducer

将液压系统中马达输出的转速减速后，传给搅拌筒。

The speed output by the motor in the hydraulic system is decelerated and transmitted to the mixing drum.

操纵机构

Operating mechanism

（1）控制搅拌筒旋转方向，使之在进料和运输过程中正向旋转，出料时反向旋转。

(1) Control the rotation direction of the mixing drum to make it rotate forward during feeding and transportation and reverse during discharging.

（2）控制搅拌筒的转速。

(2) Control the rotating speed of the mixing drum.

搅拌装置

Mixing device

搅拌装置主要由搅拌筒及其辅助支撑部件组成。搅拌筒是混凝土的装载容器，转动时混凝土沿叶片的螺旋方向运动，在不断的提升和翻动过程中受到混合和搅拌。在进料及运输过程中，搅拌筒正转，混凝土沿叶片向里运动，出料时，搅拌筒反转，混凝土沿着叶片向外卸出。

The mixing device is mainly composed of mixing drum and its auxiliary supporting parts. The mixing drum is the loading container of concrete. When rotating, the concrete moves along the spiral direction of the blade and is mixed and stirred in the process of continuous lifting and turning. During feeding and transportation, the mixing drum rotates forward, and the concrete moves inward along the blade. When discharging, the mixing drum reverses, and the concrete is discharged outward along the blade.

叶片是搅拌装置中的主要部件，损坏或严重磨损会导致混凝土搅拌不均匀。另外，叶片的角度如果设计不合理，还会使混凝土出现离析。

Blade is the main component of mixing device. Damage or serious wear will lead to uneven mixing of concrete. In addition, if the design of blade angle is unreasonable, the concrete will be separated.

清洗系统

Cleaning system

清洗系统的主要作用是清洗搅拌筒，有时也用于运输途中进行干料拌筒。清洗系统还对液压系统起冷却作用。

The main function of the cleaning system is to clean the mixing drum, and sometimes it is also used for dry material mixing drum during transportation. The cleaning system also cools the hydraulic system.

全封闭装置

Totally enclosed device

全封闭装置采用回转密封技术，密封了搅拌车的进出料口，了传统搅拌车水份蒸发、砂浆分层、砼料撒落、行车等系列问题。

The fully enclosed device adopts rotary sealing technology to seal the inlet and outlet of the mixer truck, and solves a series of problems such as water evaporation, mortar stratification, concrete scattering and driving safety of the traditional mixer truck.

维修保养

Maintenance

混凝土搅拌运输车作为运输用汽车，在维护和修理方面必须遵照交通部1990年13号令的规定，执行“定期检测、强制维护、视情修理”的维护和修理制度。在这个大前提下，再结合混凝土搅拌运输车的实际情况，做好维护和修理。在日常维护方面，混凝土搅拌运输车除应按常规对汽车发动机、底盘等部位进行维护外，还必须做好以下维护工作。

As a transport vehicle, the maintenance and repair of concrete mixer truck must comply with the provisions of order No. 13 of the Ministry of communications in 1990 and implement the maintenance and repair system of "regular inspection, compulsory maintenance and repair as appropriate". On this premise, combined with the actual situation of concrete mixer truck, do a good job in maintenance and repair. In terms of daily maintenance, in addition to routine maintenance of vehicle engine, chassis and other parts, the concrete mixer truck must also do the following maintenance work.