1.1 power take-off device
The domestic concrete mixer truck adopts the main truck engine power taking mode. 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 in the forward direction during the feeding and transportation process, so as to facilitate the feeding and mixing of the concrete, rotate in the reverse direction during the discharging, and cut off the power connection with the engine after the end of the work.
1.2 hydraulic system
The engine power taken out by the power take-off is converted into hydraulic energy (displacement and pressure), and then output to mechanical energy (speed and torque) by the motor, providing power for the rotation of the mixing drum.
Reduce the speed of the motor output in the hydraulic system, and then transfer it to the mixing drum.
1.4 operating mechanism
a. Control the rotation direction of the mixing drum to make it rotate in the forward direction in the process of feeding and transportation, and rotate in the reverse direction in the process of discharging.
b. Control the rotating speed of mixing drum
1.5 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 sheet. In order to automatically load and unload concrete, its inner wall is welded with special shape spiral blades. 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. In the process of feeding and transportation, the mixing drum rotates positively, the concrete moves inward along the blade, and when discharging, the mixing drum reverses, and the concrete is discharged outward along the blade. The rotation of the mixing drum is guaranteed by the hydraulic drive device. The concrete mixer truck with a loading capacity of 3-6 cubic meters generally uses a hydraulic pump driven by an automobile engine through a power output shaft, and then a hydraulic motor driven by a high-pressure oil to drive the mixing drum. The truck mounted auxiliary diesel engine drives the hydraulic pump to drive the hydraulic Marta with a loading capacity of 9-12 cubic meters. The blade is the main part of the mixing device, which will lead to uneven mixing of concrete if it is damaged or severely worn. In addition, if the blade angle is not designed properly, the concrete will be separated.
1.6 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.
2 maintenance and repair of concrete mixer truck
As a transport vehicle, the maintenance and repair system of "regular inspection, compulsory maintenance and repair as the case may be" must be carried out in accordance with the provisions of order No. 13 of the Ministry of communications in 1990. Under this premise, combined with the actual situation of the concrete mixer truck, the maintenance and repair should be done well. In the aspect of daily maintenance, the concrete mixer truck should not only maintain the engine, chassis and other parts of the car according to the routine, but also do the following maintenance work.
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