Why does the cement automatic mixer stick? Through practice and analysis, we believe that the causes of tank sticking of automatic cement mixer can be divided into two categories: unreasonable design and improper use, mainly in the following forms:
(1) Discharge residual rate and blade design are unreasonable.
From the perspective of the internal structure of the mixing drum, the mixing drum of the cement automatic mixer is driven by the rotating cylinder to produce the spiral movement of the two spiral blades, so that the concrete can obtain the 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 there will be more residual materials in the cement automatic mixer truck after the completion of 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.
(2) The working environment temperature of automatic cement mixer is too high.
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.
(3) The transportation distance is too long.
With the process of urbanization and the requirements of urban planning, more and more mixing plants are required to be moved to the suburbs and suburban counties, which are more and more far away from the urban area. Due to the particularity of concrete, any ready mixed concrete will enter the initial setting state in about 1h without adding retarder.
If the concrete pouring construction is carried out at this time, it will not only affect the quality of the concrete project, but also because the concrete loses its fluidity, it is easy to condense on the mixing drum and blades, which will lead to tank sticking, even if the whole vehicle concrete sticks in the tank and causes damage to the hydraulic equipment. Therefore, the automatic cement mixer has its time controlled delivery radius for transporting ready mixed concrete, which should be controlled within 1h generally.
In addition, the driver of the automatic cement mixer failed to clean and clean the residual concrete in the mixing tank and on the blades in time after the unloading of the mixer truck, did not rotate the mixing tank when the mixer truck returned to the station, and the residual concrete dried and solidified on the mixing tank and blades, which will accumulate more and more in the future, forming the phenomenon of tank sticking. More relevant content will come to our website http://www.qzt12580.com Consult!