The abrasion of mixing blades of concrete mixer truck shall be inspected regularly and repaired and replaced in time;
All relevant safety operation specifications shall be implemented. The driver of 4-m3 concrete mixer shall be trained professionally, and those without certificate shall not work;
The pressure of the hydraulic system shall comply with the provisions in the operation manual and shall not be adjusted at will. The quality and quantity of hydraulic oil should meet the original requirements;
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 lengthened discharge chute of the owner of the 4-square concrete mixer, so as to avoid accidents;
If the ambient temperature is higher than + 25 ℃, the duration from loading, transportation to unloading shall not exceed 60 minutes; if the ambient temperature of concrete mixer truck is lower than + 25 ℃, the above time shall not exceed 90 minutes;
During winter construction, it is necessary to check whether there is icing before starting the machine; when off duty, carefully remove the residual water in the mixing drum and water supply system of the 4-square concrete mixer truck, turn off the water pump switch, and put the control handle at the "stop" position;
After unloading at the construction site, the inlet hopper, discharge hopper and discharge chute should be flushed with the hose attached to the concrete mixer to remove the sludge and concrete adhering to the vehicle body. On the way back to the mixing station, 150-200l water should be injected into the mixing drum to clean the concrete residue bonded by the cylinder wall and blades;
The residual water and sundries in the mixing drum shall be drained before the concrete mixer is loaded. In the process of transportation, keep rotating to prevent concrete segregation. Before arriving at the construction site and discharging, the mixing drum should be rotated at full speed at 14-18 rpm for 1-2 minutes, and then reverse unloading should be carried out. Before reversing, the mixing drum should be stopped stably;
Every day after the work, the driver should 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 drain the water to ensure the cleanness of the concrete mixer drum. When cleaning each part of the mixing drum with high pressure water, pay attention to avoid the instrument and control rod. The distance between the pressure water nozzle and the paint surface of the car body shall not be less than 40 cm;
It is necessary to turn off the motor engine to stop the mixing drum completely when removing the dirt and residual concrete slag inside and outside the mixing drum, and when the machine maintenance personnel enter the cylinder for maintenance and welding repair. During the period when the machine maintenance personnel enter the cylinder, they must ensure that the mixing drum is well ventilated, the air is fresh, there is no combustible gas and harmful dust, and the oxygen supply is sufficient (pure oxygen is not allowed). When the electric tools are used in the cylinder, the operators of the 4-m3 concrete mixer must have good insulation protection.
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