Through practice and analysis, we believe that the causes of tank sticking of the mixer can be divided into two categories: unreasonable design and improper use. Let's explain the discharge residual rate and unreasonable blade design of the mixer first.
From the perspective of the internal structure of the mixing drum, the mixing drum of the mixing truck is driven by the rotating drum to produce spiral movement by two spiral blades, so that the concrete can obtain a composite movement of both "tangential" and "axial", so that the mixing drum has the functions of mixing and unloading. Therefore, the factors related to the formation of this spiral movement, such as the curve parameters of the spiral blades, The geometric shape and size of the mixing drum have an important influence on the discharge residual rate of the mixer truck.
However, excessive discharge residual rate means that the mixer truck will have more residual materials in the mixing tank after discharge, which is more likely to stick materials in the mixing tank due to accumulation over time. At present, most manufacturers use equiangular logarithmic spiral blades, and there is still much room for improvement in the discharge residual rate.
In addition, in the construction of wall and column, the construction site will use the tower crane bucket truck for pouring and tamping. Because the original slump of the tower crane materials is lower than that of the pump, and because the construction time is long, it usually takes 2-4 hours to unload a truck of concrete. Some drivers stop the normal rotation of the mixing drum to save fuel. In this case, it is particularly easy to cause tank sticking. Sometimes, the 9-way truck can stick to the tank for a whole day at a time, This situation is more serious in summer.
In summer, around noon in the day in the south, the ambient temperature often exceeds 30 ℃. When transporting concrete in this case, the concrete will be easier to stick to the tank because of the rapid loss of concrete slump and the higher temperature around the tank relative to the center. The tank of the agitator is operated by hydraulic transmission. The hydraulic oil flows in the pipeline at a certain speed for a long time and rubs against the pipe wall. In addition, the resistance of various valves in the pipeline and the work done by the oil pump cause the hydraulic oil to be compressed to generate heat and the oil temperature to rise.
In short, the work of concrete in the mixer drum is a very complex process, and the causes of tank sticking in the mixer are also various. The above is the content explained for you. If you have any questions about it, you can come to our website at any time http://www.zkhntjbj.com consulting service