Concrete mixer - concrete mixer structural principle. Concrete mixer truck concrete mixing by the vehicle chassis and special transport device component. China's production of concrete mixer truck chassis to use more vehicle manufacturers to provide two types of common chassis. Its private institutions including PTO, after mixing tube bracket, gearbox, hydraulic systems, the mixing tube, steering mechanism, cleaning systems. Working principle is that by taking the power plant will power the car chassis removed and driven variable displacement pump hydraulic system, the mechanical energy into hydraulic energy pass quantitative motor, motor and then drive reducer, reducer driven by the stirring device for concrete stirred. 1 take concrete mixer truck domestic power plant using the main vehicle engine power take off mode. Power take off unit's role is to take power by manipulating the engine power switch will remove the hydraulic system driven by the mixing tube, the mixing tube in the feed and transportation process forward rotation, in order to facilitate feeding and stirring concrete, in the discharge when the anti- rotation, after the end of the working of the engine power off coupling. 2 hydraulic system via the power take out engine power, converted to hydraulic energy (displacement and pressure), and then the motor output to mechanical energy (speed and torque), the rotation of the mixing tube to power. 3 hydraulic system gear speed reducer motor output after mixing tube pass. 4 control mechanism (a) control the mixing drum rotation direction, so that the feed and transportation process forward rotation, reverse rotation when the material. (2) controlling the rotational speed of the mixing tube. 5 mixing device consists of mixing tube mixing device and its auxiliary support components. Mixing tube is concrete containers, concrete along the blade rotating spiral direction, constantly upgrading and turning process by mixing and stirring. In the feeding and transport process, the mixing tube is transferred, the concrete along the blade inward movement, the material, the mixing tube reversal, concrete discharged outward along the blade. Stirring blades are the main components of the device, can cause damage or excessive wear uneven mixing concrete. In addition, if the angle of the blade design is unreasonable, but also to make concrete appear segregation. 6 cleaning system cleaning system's main role is cleaning the mixing tube, also sometimes used for transportation of dry material mixing drum. Cleaning system is also a cooling effect on the hydraulic system. 7 fully enclosed unit fully enclosed device using rotary sealing technology, sealing the mixer's expected out to solve the traditional mixer water evaporation, layered mortar, concrete material spilled, traffic safety and other issues. The classification of concrete mixer concrete mixer concrete moisture being shipped to points, there are wet material type, material type and semi-dry material type three mixer truck. Domestic mostly used wet material type concrete mixer, which can be shipped by the mixing plant (station) or by the production of concrete mixing ratio of aggregate (sand, gravel), cement and water, in the transport process, constantly wet material slowly mixing, to prevent the initial setting of concrete during transport and segregation. However, from the production to the pouring of concrete period of not more than 1.5h, to prevent the concrete setting. So, in the case of transport over longer distances requires the use of materials and semi-dry material mixer truck to transport. Dry material mixing truck according to the ratio of the dry-like aggregates and cement mixing tube directly into the car, the barrel during transport to stir dry ingredients, when the vehicle is going to reach the construction site or at the construction site with water complete concrete mixing. Semi truck being shipped material mixing aggregates in concrete and cement is prepared by the ratio, and contains some water, but the water content of less than casting requirements, the vehicle will need to reach the construction site or at the construction site add water and stir.