Concrete mixer, in order to improve the transportation of cement, avoid the waste of resources formed by bagged cement, now a lot of cement are transported by bulk small concrete mixer, because the small concrete mixer uses pneumatic conveying to discharge, discharge speed and discharge remaining rate are the important objectives of checking the discharge power of cement tank truck. Concrete mixer, how to ensure that the car tank of cement as far as possible to unload, unload, select the correct method is very important. Because the cement in the tank can not be seen directly by naked eyes during the discharging process, it is necessary to distinguish the discharging condition of cement by some methods
According to the pressure gauge, the air pressure in the tank is 1.8-2.4 kg / cm2 when the small concrete mixer is discharging. When the small concrete mixer is discharging, the air pressure drops rapidly. If the pressure gauge drops to 0-0.2 kg / cm2, it proves that the cement in the tank is completely discharged.
According to the method of judging the discharging time of small concrete mixer, the discharging speed of normal cement tank is generally 1-1.2 tons per minute. If the loading capacity of cement is 32 tons, it usually takes about half an hour to finish discharging. Therefore, the discharging time can be calculated according to the discharging tonnage, which makes it easier for the operators in the first 25 minutes, There is no need to keep a close eye on the pressure gauge for a long time or go through other ways to check whether it has been unloaded.
According to the method of distinguishing the sound of air compressor, the load of air compressor is large during normal discharge, and the sound announced during the operation of air compressor is boring. At the end of tank discharge, the load of air compressor becomes smaller and the operation sound becomes loud. Concrete mixer truck
In the process of cement unloading, the tank of small concrete mixer can be hit by hand. If the sound has no echo, it proves that there is more cement in the tank, and it needs to be unloaded for a period of time; If the tank has an echo, it proves that the cement in the tank is almost discharged.
According to the observation method of discharge hose, during normal discharge, the discharge hose is impacted by fluidizing cement, and the hose vibrates continuously. If the hose no longer vibrates, it can also prove that the cement in the tank is completely discharged.
According to the division method of cement receiving tower top ash, when the small concrete mixer truck is discharging normally, the air consumption of cement is relatively less, "more material and less gas", less receiving tower top ash, and "less material and more gas" at the later stage of discharging, more receiving tower top ash.
For concrete mixer truck, the above methods can briefly distinguish whether the cement of small concrete mixer truck has been unloaded or not. Due to different structures, different air compressors, different heights of cement receiving tower and different proportion of cement, the unloading speed and remaining rate of various cement tank trucks are also different. The driver can record the practical operation method and unloading time, Constantly sum up experience, to achieve the best operation method, to achieve the highest discharge power.
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