Main components: front and rear mixer, mixer, hydraulic system, etc.
Power take-off device: the main engine power take-off mode is adopted for domestic concrete mixer truck. 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 stirring drum rotates forward in the process of feeding and transportation to facilitate the feeding and mixing of concrete. It rotates reversely when discharging, and cuts off the power connection with the engine after the end of the work.
Hydraulic system: the engine power taken out by the power take-off device (now it is generally full-function power take-off device at the rear) is converted into hydraulic energy (displacement and pressure), and then output to mechanical energy (speed and torque) by motor to provide power for the rotation of mixing drum.
Reducer: the speed of the motor output in the hydraulic system is decelerated and transmitted to the mixing drum.
a. Control the rotation direction of the mixing drum to make it rotate forward in the process of feeding and transportation, and reverse rotation when discharging.
b. Control the speed of mixing drum.
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 thin 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 mixed in the process of continuous lifting and turning. In the process of 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.
The rotation of the mixing drum is ensured by the hydraulic driving device. The loading capacity is 3-6 cubic meters. In general, 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. When the loading capacity is 9-12 cubic meters, the vehicle auxiliary diesel engine drives the hydraulic pump to drive the hydraulic motor. Blade is the main part of the mixing device, damage or serious wear will lead to uneven mixing of concrete. In addition, if the angle of blade is not reasonable, it will cause concrete segregation.
Cleaning system: the main function of the cleaning system is to clean the mixing drum, and sometimes it is used for dry material mixing during transportation. It also plays a role in cleaning the hydraulic cooling system.
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