A double spiral blade is arranged on the inner wall of the mixing drum of the loading mixer, which rotates forward to feed and concrete mixing; The concrete is discharged from the discharge port under the push of the spiral blade. The safety operation specification of self loading mixer is introduced as follows:

1、在施工现场卸料完毕后，应立即用自上料搅拌车随带的软管冲洗进料斗、出料斗、卸料溜槽等处，清除粘附在车身各处的污泥及混凝土。在返回搅拌站的途中，应向搅拌筒内注150---200L水以清洗筒壁及叶片粘结的混凝土残渣。

1. After unloading at the construction site, immediately flush the feed hopper, discharge hopper, discharge chute, etc. with the hose attached to the loading mixer to remove the sludge and concrete adhered to the vehicle body. On the way back to the mixing plant, 150-200l water shall be injected into the mixing drum to clean the concrete residue bonded to the drum wall and blades.

2、每天工作结束后，司机应负责向搅拌筒内注入清水并高速（14—18转/分）旋转5—10分钟，然后将水排去，以保障筒内清洁。用高压水清洗搅拌筒各个部分时，应注意避开仪表及操纵杆等部位。压力水喷嘴与车身油漆表面间的距离不得小于40厘米。

2. After daily work, the driver shall be responsible for injecting clean water into the mixing drum and rotating at high speed (14-18 RPM) for 5-10 minutes, and then drain the water to ensure the cleanness of the drum. When cleaning all parts of the mixing drum with high-pressure water, pay attention to avoid instruments, control rods and other parts. The distance between the pressure water nozzle and the paint surface of the vehicle body shall not be less than 40cm.

3、清除搅拌筒内外积污及残存的混凝土渣块时，以及在机修人员进入筒内进行检修和焊补作业时，需先关闭自上料搅拌车发动机，使搅拌筒完全停止转动。在机修人员进入筒内工作期间，应该保障拌筒内通风良好，空气新鲜，无可然气体及有害灰尘，氧气供应充足。在筒内使用电动工具操作时，操作人员应该有良好的绝缘保护。

3. When removing the accumulated dirt and residual concrete slag inside and outside the mixing drum, and when the mechanical maintenance personnel enter the drum for maintenance and welding repair, it is necessary to turn off the self feeding mixing truck engine to stop the mixing drum completely. During the period when the mechanical maintenance personnel enter the drum for work, they shall ensure that the mixing drum has good ventilation, fresh air, no combustible gas and harmful dust, and sufficient oxygen supply. When using electric tools in the cylinder, the operator shall have good insulation protection.

4、工作时，不得将手伸入旋转的搅拌筒内，严禁将手伸入主卸料溜槽和加长卸料溜槽的连接部位自动，工作人员如何规范操作自上料搅拌车以免发生事故。

4. When working, do not put your hand into the rotating mixing drum. It is strictly prohibited to put your hand into the connecting part of the main discharge chute and the extended discharge chute. How to standardize the operation of the self loading mixer truck to avoid accidents.