No matter how excellent the performance of the concrete mixer truck is, in the process of long-term work, it is inevitable that the concrete congeals on the mixing tank and blades and sticks to the tank. If it is not cleaned in time, it is very easy to lead to the overload of the concrete mixer truck, and then cause the failure of the hydraulic pump and motor, and even affect the normal attendance of the vehicle. In order to solve this problem, this paper analyzes and discusses the causes of concrete sticking in the process of using concrete mixer truck.

我们认为混凝土搅拌车粘罐原因可以分为两大类：即设计不合理和使用不当

In our opinion, the causes of sticking of concrete mixer can be divided into two categories: unreasonable design and improper use

经过实践和分析，我们认为混凝土搅拌车粘罐原因可以分为两大类：即设计不合理和使用不当，主要有以下几种形式：

After practice and analysis, we think that the causes of sticking can be divided into two categories: unreasonable design and improper use

1.卸料残余率和叶片设计的不合理。从搅拌筒的内部结构看，混凝土搅拌车的拌筒是依靠回转的筒体带动其中的两条螺旋叶片所产生的螺旋运动，使混凝土获得既有“切向”又有“轴向”的复合运动，从而使搅拌筒具有搅拌和卸料的功能，因此形成这一螺旋运动的有关因素，诸如螺旋叶片的曲线参数，搅拌筒的几何形状和尺寸等对搅拌车的卸料残余率都有重要影响。而过大的卸料残余率意味着搅拌车在卸料结束后在搅拌罐里会有更多的余料，因而更有可能因日积月累在搅拌罐中粘料。

1. Unreasonable discharge residual rate and blade design. From the internal structure of the mixing drum, the mixing drum of the concrete mixer depends on the spiral movement of the two spiral blades driven by the rotating drum, which makes the concrete obtain the compound movement of both "tangential" and "axial", so that the mixing drum has the function of mixing and discharging. Therefore, the relevant factors of the spiral movement, such as the curve parameters of the spiral blades, are formed The geometry and size of the mixing drum have an important influence on the discharge residual rate of the mixer. Excessive discharge residual rate means that there will be more residual materials in the mixing tank after discharge, so it is more likely to stick in the mixing tank due to accumulation over time.
              

2.运输距离过长。随着城市化的进程及城市规划的要求，越来越多的搅拌站被要求迁到郊区和郊县，与市区的距离越来越远，而由于混凝土这一产品的特殊性，任何预拌混凝土在未添加缓凝剂的情况下，都在1h左右进入初凝状态，如果这时才进行混凝土浇注施工，不但影响混凝土的工程质量，而且因混凝土失去流动性，易在搅拌筒及叶片上凝结，导致粘罐，严重时甚整车混凝土粘在罐内及造成液压设备的损坏，所以混凝土搅拌车运送预拌混凝土有其时间控制的输送半径，一般应控制在1h以内。

2. 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 move to the suburbs and counties, and the distance from the urban area is getting farther and farther. Due to the particularity of concrete, any ready mixed concrete without adding retarder will enter the initial setting state in one hour. If concrete pouring construction is carried out at this time, it will not only affect the quality of concrete Engineering quality, and because of the loss of fluidity of concrete, it is easy to coagulate on the mixing drum and blade, resulting in sticking to the tank, and even the whole vehicle of concrete sticking to the tank and causing damage to the hydraulic equipment. Therefore, the transportation radius of premixed concrete by concrete mixer truck has its time control, which should be generally controlled within 1h.

3.工地施工设计不合理。工地在墙柱等施工中，会用塔吊吊斗车的方法进行浇捣，由于塔吊的料本来塌落度就比泵送的低，更由于施工时间长，卸一车混凝土通常要2~4h，有些驾驶员为了省油而停止搅拌筒的正常转动，这种情况下，特别容易造成粘罐，有时9方车一次粘罐就达1t，在夏天情况更严重。

3. Unreasonable construction design. In the construction of walls and columns, the tower crane bucket car will be used for pouring and tamping. Because the slump of the tower crane material is lower than that of the pump, and because of the long construction time, it usually takes 2 ~ 4H to unload a truck of concrete. Some drivers stop the normal rotation of the mixing drum in order to save oil. In this case, it is particularly easy to cause tank sticking. Sometimes, the tank sticking can reach 1t at a time for a 9m3 truck. In summer, the tank sticking is very common More serious.

4.使用维护不当。混凝土搅拌车驾驶员在搅拌车卸料完毕后未及时清理清洗搅拌罐内及叶片上残留的混凝土，在搅拌车回站过程中不转动搅拌罐，残留的混凝土干燥后凝固在拌筒及叶片上，以后就会越聚越多，形成粘罐现象。

4. Improper use and maintenance. The driver of the concrete mixer truck fails to clean the residual concrete in the mixing tank and on the blades after the unloading of the mixer truck, and does not rotate the mixing tank when the mixer truck returns to the station. The residual concrete solidifies on the mixing drum and blades after drying, and then it will gather more and more, forming the phenomenon of sticking to the tank.

5.混凝土搅拌车工作环境温度过高。夏季在南方地区白天中午前后，环境温度经常超过30℃，在这种情况下运输混凝土，将会由于混凝土坍落度损失快以及罐体周围温度相对中 心更高，因而混凝土更容易粘罐。

5. The working environment temperature of concrete mixer is too high. In summer, around noon in the daytime in southern China, the ambient temperature often exceeds 30 ℃. In this case, due to the rapid slump loss of concrete and the higher temperature around the tank, the concrete is easier to stick to the tank.