The principle of concrete tank truck is the same as that of concrete mixing bucket, but it is just pulling the mixing bucket with the truck and mixing while walking. When you get to the destination, you can put down the concrete! Under normal circumstances, the concrete in the tank car will not set, because whether the vehicle is running or stopped, as long as there is concrete in the mixing tank, the mixing tank must always maintain low speed rotation. During transportation, the drum speed is about 4 ~ 8 revolutions per minute. There are several advantages to keep rotating: as long as the concrete is not separated, the concrete collapse degree is guaranteed! Secondly, the mixing function makes the concrete more uniform!
The difference between the concrete tank car and the ordinary car lies in the hydraulic transmission system, because the concrete tank needs additional power to drive the rotation, which is the credit of the hydraulic transmission system. The power comes from the power take-off on the gearbox. The power take-off drives the hydraulic oil pump. The hydraulic oil pump drives the hydraulic motor to rotate through the distributor (valve group). The hydraulic motor drives the concrete tank to rotate through the deceleration system. Through the distributor to change the direction of the hydraulic oil to change the rotation direction of the drum, realize the mixing and discharging.
Although the rotation can extend the initial setting time of concrete, but this time can not be indefinitely extended! When the rotation speed of concrete tank is 4-8 revolutions per minute, the initial setting time of concrete can be maintained at about 3-5 hours. Of course, it has a certain relationship with weather temperature and concrete mix proportion. In case of traffic jam, the rotation speed can be appropriately increased. If the weather temperature is too high, the initial setting event can be shortened, and the water can be replenished appropriately, but the construction party has strict regulations: no water on the way! It will affect the quality of concrete and reduce the strength.
Accidents always happen: the tank car can't clear the tank in time because of faults or accidents, so the concrete in the tank will solidify! That is to say: "stuffy pot"! This time can only be manually cleaned, there is no other way! And it takes time and effort to clean up! The cost is about ten thousand yuan! So sometimes you can see the roadside tanker throwing concrete, and you should throw away the unused ones in time to avoid solidification in the car.
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