Double-spiral blades are arranged on the inner wall of the mixing drum, and the forward rotation is used for feeding and concrete mixing; Reverse rotation, driven by the spiral blade, the concrete is discharged from the outlet. The safety operation specifications of self-feeding mixer are as follows:

在施工现场卸料自上料搅拌车搅拌筒内壁上设置双螺旋形叶片，正向旋转为进料、混凝土搅拌；反向旋转，在螺旋叶片的推动下、混凝土由出料口出料。自上料搅拌车安全操作规范介绍如下：

Double-spiral blades are set on the inner wall of the mixing drum of the unloading and self-loading mixer at the construction site, and the forward rotation is feeding and concrete mixing; Reverse rotation, driven by the spiral blade, the concrete is discharged from the outlet. The safety operation specifications of self-feeding mixer are as follows:

1、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 inlet hopper, outlet hopper, discharge chute and other places with the hose attached to the self-loading mixer truck to remove the sludge and concrete adhering to the vehicle body. On the way back to the mixing station, 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. At the end of each day's work, the driver shall be responsible for injecting clean water into the mixing drum and rotating it at high speed (14-18 rpm) for 5-10 minutes, and then draining the water to ensure the cleanness of the drum. When using high-pressure water to clean all parts of the mixing drum, attention should be paid to avoiding the parts such as instruments and control rods. The distance between the pressure water nozzle and the body paint surface shall not be less than 40 cm.

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 dirt and residual concrete slag inside and outside the mixing drum, as well as when the mechanical maintenance personnel enter the drum for maintenance and welding repair operations, it is necessary to shut down the engine of the self-feeding mixing truck to completely stop the mixing drum. During the period when the machine maintenance personnel enter the mixing drum for work, they should ensure that the mixing drum is well ventilated, fresh air, free of natural gas and harmful dust, and sufficient oxygen supply. When using electric tools in the cylinder, the operator should 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 hands into the rotating mixing drum. Do not put your hands into the connection part of the main discharge chute and the extended discharge chute automatically. How can the staff operate the self-feeding mixing truck to avoid accidents.