▼ regularly check the wear of mixing blades of concrete mixer truck and timely repair and replace them;

▼贯彻各项有关操作规范。4方混凝土搅拌车司机须经过培训，无合格证者不得上岗操作；

▼ implement all relevant safety operation specifications. The driver of 4-party concrete mixer truck must receive professional training and shall not work without certificate;

▼液压系统压力应符合使用说明书中的规定，不得随意调整。液压油的油质和油量应符合原定要求；

▼ the pressure of the hydraulic system shall comply with the provisions in the operation manual and shall not be adjusted at will. The oil quality and quantity of hydraulic oil shall meet the original requirements;

▼工作时，不得将手伸入旋转的搅拌筒内，严禁将手伸入4方混凝土搅拌车主卸料溜槽和加长卸料溜槽的连接部位，以免发生事故；

▼ when working, do not put your hand into the rotating mixing drum, and do not put your hand into the connection between the unloading chute and the extended unloading chute of the 4-square concrete mixer to avoid accidents;

▼环境温度高于+25摄氏度，从装料、运输、到卸料延续时间不得超过60分钟，混凝土搅拌车环境温度低于+25摄氏度，上述时间不得超过90分钟；

▼ when the ambient temperature is higher than + 25 ℃, the duration from loading, transportation and unloading shall not exceed 60 minutes. When the ambient temperature of concrete mixer is lower than + 25 ℃, the above time shall not exceed 90 minutes;

▼冬期施工时，应切实做到：开机前检查是否结冰；下班时认真排除4方混凝土搅拌车拌筒内及供水系统内残存积水，关闭水泵开关，将控制手柄置于“停止”位置；

▼ during winter construction, it shall be ensured that: check whether it is frozen before startup; When off duty, carefully remove the residual ponding in the mixing drum of 4-square concrete mixer and the water supply system, turn off the water pump switch and put the control handle in the "stop" position;

▼在施工现场卸料完毕后，应立即用混凝土搅拌车随带的软管冲洗进料斗、出料斗、卸料溜槽等处，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；

▼ after unloading at the construction site, immediately flush the feed hopper, discharge hopper, discharge chute, etc. with the hose provided with the concrete 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;

▼混凝土搅拌车装料前，应先排净拌筒内残存的积水和杂物。在运输过程中要不停的转动，以防混凝土离析。4方混凝土搅拌车到达工地和卸料之前，应先使拌筒全速以14-18转/分转动1-2分钟，然后再进行反转卸料。反转之前，应使搅拌筒停稳不转；

▼ before loading the concrete mixer truck, the residual ponding and sundries in the mixing drum shall be drained first. Keep rotating during transportation to prevent concrete segregation. Before the 4m3 concrete mixer truck arrives at the construction site and unloading, first rotate the mixing drum at full speed at 14-18 rpm for 1-2 minutes, and then reverse unloading. Before reversing, the mixing drum shall be stopped stably;

▼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，以保障混凝土搅拌车筒内清洁。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；

▼ at the end of each day's 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 discharging the water to ensure the cleanness of the concrete mixing 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;

▼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，需先关闭汽车发动机，使搅拌筒完全停止转动。在机修人员进入筒内工作期间，须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（不得使用纯氧）。在筒内使用电动工具操作时，4方混凝土搅拌车操作人员须有良好的绝缘保护。

▼ 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 automobile engine first to stop the mixing drum completely. During the period when the mechanical maintenance personnel enter the drum for work, ensure that the mixing drum has good ventilation, fresh air, no combustible gas and harmful dust, and sufficient oxygen supply (pure oxygen shall not be used). When using electric tools in the drum, the operators of 4-square concrete mixer must have good insulation protection.