The concrete mixer truck is composed of a truck chassis and a special device for concrete mixing and transportation. The chassis of the concrete mixer truck mostly adopts the second-class general chassis provided by the chassis manufacturer. Its special mechanism mainly includes power take-off, front and rear brackets of mixing drum, reducer, hydraulic system, mixing drum, operating mechanism, cleaning system, etc. The working principle is that the power of the chassis is taken out through the power take-off device, and the variable pump of the hydraulic system is driven, and the mechanical energy is converted into hydraulic energy and transmitted to the quantitative motor. The motor then drives the reducer, and the reducer drives the mixing device. 1. Power take-off device The cement mixer truck adopts the power take-off method of the main truck engine. The function of the power take-off device is to take out the engine power by operating the power ta...