1. The discharge residual rate and blade design are unreasonable. From the internal structure of the mixing drum, the mixing drum of the concrete mixer truck relies on the rotating cylinder to drive the spiral motion generated by the two spiral blades, 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 forming this spiral movement, such as the curve parameters of spiral blades, are obtained The geometric shape and size of the mixing drum have an important influence on the discharge residual rate of the mixer truck. However, the excessive discharge residual rate means that there will be more residual materials in the mixing tank after unloading, so it is more likely to stick materials 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，严重时甚至整车混凝土粘在罐内及造成液压设备的损坏，所以自上料混凝土搅拌罐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 suburban counties, and the distance from the urban area is getting more and more far. Due to the particularity of concrete, any ready mixed concrete will enter the initial setting state within 1h without adding retarder. If the concrete pouring construction is carried out at this time, it will not only affect the concrete quality Engineering quality, and because of the loss of fluidity of concrete, it is easy to coagulate on the mixing drum and blades, resulting in sticking to the tank, even the whole vehicle concrete sticking in the tank and causing damage to the hydraulic equipment. Therefore, the concrete mixer truck has its time controlled delivery radius for transporting ready mixed concrete, which should be 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. The site construction design is unreasonable. In the construction site, it is usually easier to use the crane truck to pour the concrete for 2 hours, which is usually more convenient for the driver to stop pouring concrete at the construction site More serious.

4.使用维护不当。自上料混凝土搅拌罐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 does not clean and clean the residual concrete in the mixing tank and on the blades in time after the unloading of the mixer truck, and does not rotate the mixing tank when the truck returns to the station. The residual concrete will solidify on the mixing drum and blades after drying, and it will accumulate more and more and form the phenomenon of sticking the tank.

5.自上料混凝土搅拌罐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, the ambient temperature often exceeds 30 ℃ around noon in the south of China. In this case, the concrete is more likely to stick to the tank due to the rapid loss of concrete slump and the higher temperature around the tank.