Because concrete is composed of stone, sand, cement and water, if it doesn't rotate and bumps constantly during transportation, the stone will sink to the bottom, the sand is in the middle, and the cement and water are on the top. When it is transported to the destination, there will be caking, which is also what we often call a stuffy tank.
Therefore, rotation can not only prevent concrete solidification, but also prevent concrete stratification, but also make concrete mix more evenly.
I believe many friends have seen pouring concrete on the roadside. Curiously, it's too wasteful. Don't you want such a load of concrete?
During the transportation of concrete mixer truck, sometimes there will be various faults or traffic jam for a long time, which will make the concrete solidify in the tank and lead to tank stuffing.
After this situation occurred, people also came up with many methods, including cutting a hole at a certain position of the tank, manually cleaning out the concrete inside with an air pick, and finally welding and sealing the opening.
Some also use the wall breaking machine to cooperate with the water drill to drill holes, which can reduce the dust and sand splash, and then discharge it from the discharge port. This method is also more efficient.
There is also the method of thermal expansion and cold contraction. Even if the tank is blocked, there will still be space in the tank. After burning the concrete with oil, water it quickly for cooling, and the concrete will become brittle, which is easier to clean.
It is said that foreign countries also directly use gunpowder to explode, but this requires professional people to operate, and the risk is also great. Of course, the easiest way is to directly change a tank.
The cost of cleaning the stuffy tank varies according to different places and cleaning methods, but the minimum price is more than 5000, in some places it will reach 20000, and the cleaned tank will be damaged more or less, and the service life will be shorter.
Structure of concrete mixer
The tank shell is made of very wear-resistant steel. In order to automatically load and unload the concrete, a rotating blade with special shape is welded inside. When rotating, the concrete will move with the direction of blade rotation, and various materials will be fully mixed and stirred in the process of continuous rotation and turnover.
In the process of feeding and transportation, the tank rotates forward, and the concrete will move inward with the blade. In the process of discharging, the tank will reverse, and the concrete will be discharged outward along the blade.
The rotation of the tank is completed by the hydraulic drive system on the truck. Usually, the hydraulic pump is driven by the power take-off shaft on the truck to drive the mixing tank to rotate.
We can often see various traffic accidents of concrete mixer truck in various reports, which also caused a lot of casualties. These are the main reasons. The whole chassis of concrete mixer truck is very high, and the driver will have a lot of blind spots during operation, especially when turning.
In addition, the speed of concrete mixer truck is generally fast. In addition, the braking distance will become longer due to the body and heavy concrete, which are the reasons for frequent accidents.
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