The work principle of concrete mixer truck

With the rapid development of production technology and the construction of concrete mixer truck, some countries have gradually adopted a centralized mixing concrete manner commercialization supply concrete by specialized concrete mixing station to provide further stirred by a concrete truck transported to the construction sites. Structural principles are briefly described as concrete mixers and maintenance. 

1 concrete mixing truck components and working principle 
Concrete mixer truck chassis of the vehicle by the concrete mixing and transport special device component. China's production of concrete mixer truck chassis to use more vehicle manufacturers to provide two types of GM chassis. Its special mechanism includes power take off, before and after mixing tube frame, gearbox, hydraulic systems, the mixing tube, the control mechanism, cleaning system. How it works: by taking force means the car chassis, power out, and drives the variable displacement pump hydraulic system, the mechanical energy into hydraulic energy passed to the quantitative motor, the motor and then drive gear, the gear drive stirring means for concrete conduct stirring. 

1.1 PTO device 
Domestic concrete mixer truck adopts the main vehicle engine power take off mode. Take the role of power plant is operated by the power take off switch will remove the engine power, the hydraulic system driven mixing tube, stir in the feed tube shaking during transportation and forward rotation, in order to facilitate the feed and concrete stirring at the material time reverse rotation, after the end of the work and cut engine power coupling. 

1.2 Hydraulic System 
The power of the engine by removing the power take off, into hydraulic energy (displacement and pressure), and then the motor output of mechanical energy (speed and torque), is powered by stirring drum rotation. 

1.3 reducer 
After the hydraulic system motor output speed reducer, pass the mixing tube. 

1.4 operating mechanism 
a. Control the mixing drum rotation direction, so that the feed and transport the forward rotation, reverse rotation when the material. 
b. Control the speed of the mixing tube 

1.5 mixing device 
It mainly consists of the mixing tube and the auxiliary support components. Concrete mixing tube is loaded container, which is made from high quality wear-resistant steel sheet, in order to be able to automatic loading and unloading of concrete whose interior walls welded special shaped spiral blade. Concrete spiral rotation along the direction of motion of the blade, constantly upgrading and turning process by mixing and stirring. In the feeding and transportation process, the mixing tube is transferred, the concrete along the blade inward movement, when the material, the mixing tube inversion, concrete discharged outward along the blade. Mixing tube is rotated by a hydraulic drive system to be guaranteed. Loading of 3 to 6 cubic meters. Concrete mixer truck commonly used by the hydraulic pump driven by the vehicle engine power output shaft, and then push the high pressure oil hydraulic motor driven mixing drum, loading capacity of 9 to 12 cubic meters of the onboard auxiliary diesel engine driven hydraulic pump drives a hydraulic motor. Blade stirring device is the main component, damage or serious wear and tear can cause uneven mixing concrete. In addition, if the angle of the blade design is unreasonable, but also to make concrete appear segregation. 

1.6 Cleaning System 
1. The primary role of cleaning system is cleaning the mixing tube, sometimes used for transit dry material mixing. Cleaning systems also hydraulic system cooling effect. 
2. The concrete mixer truck maintenance and repair 
Concrete mixer truck as transport vehicles, maintenance and repairs must comply with Department of Transportation regulations Decree 13 of 1990, the implementation of "periodic testing, mandatory maintenance and repair, as appropriate," the maintenance and repair system. Under this premise, combined with the actual situation of concrete mixer truck, to do maintenance and repair. In routine maintenance, concrete mixer truck should be in addition to the conventional automobile engine, chassis and other parts for maintenance, but also must do the following maintenance work. 

2.1 cleaning concrete tank (mixing tube) and out of the discharge port 
Since the concrete in a short time will be solidified into a lump, and the steel and paint a certain corrosive, so the concrete tank after each use, wash adhered to the concrete tank and the concrete is expected out daily maintenance must be serious work carried out. Which comprises: 
a. Before each loading washing with water inlet, the feed mouth kept moist during charging; 
b. While in charge of the vehicle carrying the wash water tank filled with water; 
c. After loading flush inlet, inlet cleaning residual nearby concrete; 
d. To the site after discharge, wash out the tank, and then into the concrete wash water tank plus 30-40 L; concrete holding tank when the vehicle is rotated forward slowly return; 
e. Remember to let go before the next charge of Concrete sewage in the tank; 
f. Thoroughly cleaning the tank and call it a day every day around the concrete material inlet and outlet, ensure non-stick cement and concrete agglomeration. 
These work as long as no one seriously, it will bring a lot of trouble for future work. 

2.2 Maintenance drive 
The driving means is driven to rotate concrete tank, which consists of the power take off, cardan shaft, hydraulic pumps, hydraulic motors, control valves, hydraulic tank and cooling system components. If this section due to failure to stop working, concrete tank will not rotate, which causes the interior concrete scrap, in serious cases, so that the entire concrete tank condensation in the tank, causing the concrete mixer truck scrapped. Therefore, whether the drive is in use and reliable must attach great importance to the issue. To ensure reliable drive intact, should do the following maintenance work: 
a. Universal rotating part is fault-prone parts shall When greasing, and regular checks of wear, and timely repair replacement. The team should spare the cardan shaft assembly to ensure that the event of failure to resume work in a few of minutes. 
b. Ensure that the hydraulic oil clean. Concrete mixer truck harsh working environment, we must prevent sewage sediment into the hydraulic system. Manual hydraulic oil according to require periodic replacement. Once the inspection found that the hydraulic oil mixed with water or sand, should immediately stop cleaning hydraulic systems, replacement of hydraulic oil. 
c. Ensure effective hydraulic oil cooling system. To regularly clean hydraulic oil cooler, radiator clogged avoid cement, check the radiator electric fan is functioning properly, to prevent the hydraulic oil temperature exceeded. Hydraulic part as long as the hydraulic oil clean, the general failure much; but produced by different manufacturers, life is not the same. 


Hubei Changjie Special Purpose Vehicle Co. Ltd 
E-mail: cj802@urspv.com 
Tel: 0086-0722-329933