Special mechanisms mainly include: power takeoff, front and rear supports of mixing drum, reducer, hydraulic system, mixing drum, operating mechanism, cleaning system, etc.
取力裝置：國產混凝土攪拌運輸車采用主車發動機取力方式。取力裝置的作用是通過操縱取力開關將發動機動力取出，經液壓係統驅動攪拌筒，攪抖筒在進料和運輸過程中正向旋轉，以利於進料和對混凝土進行攪拌，在出料時反向旋轉，在工作終結後切斷與發動機的動力聯接。
Power take-off device: 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, drive the mixing drum through the hydraulic system, and 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 the end of work.
液壓係統：將經取力器取出的發動機動力(現在一般都是後置全功能取力器)，轉化為液壓能(排量和壓力)，再經馬達輸出為機械能(轉速和扭矩)，為攪拌筒轉動提供動力。
Hydraulic system: convert the engine power taken out by the power take-off (now generally rear full-function power take-off) into hydraulic energy (displacement and pressure), and then output into mechanical energy (speed and torque) through the motor to provide power for the rotation of the mixing drum.
減速機：將液壓係統中馬達輸出的轉速減速後，傳給攪拌筒。
Reducer: after decelerating the speed output by the motor in the hydraulic system, it is transmitted to the mixing drum.
操縱機構：
Operating mechanism:
a．控製攪拌筒旋轉方向，使之在進料和運輸過程中正向旋轉，出料時反向旋轉。
a. Control the rotation direction of the mixing drum to make it rotate forward during feeding and transportation and reverse during discharging.
b．控製攪拌筒的轉速。
b. Control the rotating speed of the mixing drum.
攪拌裝置：它主要由攪拌筒及其輔助支撐部件組成。攪拌筒是混凝土的裝載容器，它是由優質耐磨薄鋼板製成，為了能夠自動裝、卸混凝土，其內壁焊有特殊形狀的螺旋葉片。轉動時混凝土沿葉片的螺旋方向運動，在不斷的提升和翻動過程中受到混合和攪拌。在進料及運輸過程中，攪拌筒正轉，混凝土沿葉片向裏運動，出料時，攪拌筒反轉，混凝土沿著葉片向外卸出。
Mixing device: it is mainly composed of mixing drum and its auxiliary supporting parts. The mixing drum is a concrete loading container, which is made of high-quality wear-resistant steel plate. In order to automatically load and unload concrete, its inner wall is welded with spiral blades of special shape. 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.
攪拌筒的轉動則是靠液壓驅動裝置來保證。裝載量為3～6立方。的混凝土攪拌運輸車一般采用由汽車發動機通過動力輸出軸帶動液壓泵，再由高壓油推動液壓馬達驅動攪拌筒，裝載量為9～12立方的則由車載輔助柴油機帶動液壓泵驅動液壓馬達。葉片是攪拌裝置中的主要部件，損壞或嚴重磨損會導致混凝土攪拌不均勻。另外，葉片的角度如果設計不合理，還會使混凝土出現離析。
The rotation of the mixing drum is guaranteed by the hydraulic driving device. The loading capacity is 3 ~ 6 cubic meters. Generally, the truck engine drives the hydraulic pump through the power output shaft, and then the high-pressure oil drives the hydraulic motor to drive the mixing drum. For the truck with a loading capacity of 9 ~ 12 cubic meters, the on-board auxiliary diesel engine drives the hydraulic pump to drive the hydraulic motor. 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.
清洗係統：清洗係統的主要作用是清洗攪拌筒，有時也用於運輸途中進行幹料攪拌。清洗係統還對液壓係統起冷卻作用。
Cleaning system: the main function of the cleaning system is to clean the mixing drum, and sometimes it is also used for dry material mixing during transportation. The cleaning system also cools the hydraulic system.
