We all know that in the process of building houses and roads, one material must be used, which is concrete. Concrete is composed of water, sand and cement. The house can be built so high and the road surface can be so strong, and the concrete must rely on concrete.
However, in many construction sites, due to the limitations of on-site conditions, these materials cannot be used to make concrete on site. Instead, concrete needs to be made on a professional site, and then the product concrete is transported to the construction site with a special vehicle. This special vehicle is a concrete mixer truck.
We are very familiar with concrete mixer trucks, because we can often see it on the road or on construction sites. At the same time, we also have many questions. Why is the tank body rotating all the time, and what is the internal structure of the tank body like? Let’s learn about it together.
Concrete Mixer Truck
Concrete Mixer Truck is a special vehicle used to transport concrete. Since the truck always carries a rotating mixing tank, it is also vividly called a field screw truck.
Concrete mixer trucks are mainly transported by multi-axle trucks, and the tank body must always rotate continuously during transportation.
Concrete manufacturing factory, that is, the mixing station will directly load the made concrete into the concrete mixing truck tank, transport it to the construction site by truck, and then pour the concrete out of the tank to directly pour the pavement or wall.
Concrete mixer truck is also one of the most widely used and most frequently used construction equipment in construction projects today.
Development history of concrete mixer truck
In fact, the development process of concrete mixer trucks is equivalent to a microcosm of human progress and the development of the construction industry.
The earliest buildings of human beings were built with branches and stones. Later, buildings made of soil appeared, and the materials of these buildings were relatively single.
Later, with the advancement of society and the development of technology, in order to make the building stronger, more complex building materials, such as concrete, began to be used.
This requires the use of tools to mix concrete made of various materials. When concrete first appeared in the early 20th century, the more primitive method of using stirring concrete or manual mixing was not only physically labor-intensive but also low efficiency. The concrete was also stirred on site and was not transported for a long distance.
By the 1970s, a fixed concrete mixer was introduced, and a small cart would be used to transport concrete at a short distance, which improved the efficiency a lot.
In the 1980s, a mobile mixer was pulled by a truck.
In the 1990s, trucks and concrete tanks began to be combined, which allowed the concrete to be transported for a long distance, and loading and unloading were automated, and concrete mixing trucks were also developed rapidly.
Why is the tank body of the concrete mixer truck constantly turning?
Because concrete is composed of stone, sand, cement and water. If it does not turn during transportation and it keeps bumping, the stone will sink to the bottom, the sand is in the middle, and the cement and water are on the top, and when it is transported to the destination, it will clump. It is also what we often call a stuffed can.
Therefore, rotation can not only prevent concrete from solidification, but also prevent concrete from layering, but also allow concrete to mix more evenly.
cans
I believe many friends have seen concrete pouring on the roadside. I’m curious that this is too wasteful. Do you want such a truck of concrete?
During the transportation process, the concrete mixer sometimes has various faults or long-term traffic jams, which will cause the concrete to solidify in the tank body and cause the tank to become stuffed.
So why would you rather pour it out than just stuff it? After this situation occurred in
, people also came up with many solutions, such as cutting a hole in a certain position of the tank, then manually cleaning out the concrete inside with a pneumatic pick, and finally welding and sealing the openings.
also uses a wall breaker and a drill to drill holes, which can reduce dust and sand and stone splash, and then discharge it from the discharge port. This method is also more efficient.
It also uses thermal expansion and contraction. Even if the tank is blocked, there will still be space in the tank. After burning the concrete with oil, watering it quickly to cool it down, and the concrete will become brittle, which is easier to clean.
It is said that there are also gunpowder that is directly used to fry abroad, but this requires professional people to operate, and the risk is also very high. Of course, the most convenient way is to change the tank directly.
The cost of cleaning the stuffed can is not consistent depending on the different places and cleaning methods, but the minimum is more than 5,000 yuan, and in some places it will reach 20,000 yuan. In addition, the cleaned can body is more or less damaged, and its service life will be shorter. The structure of the concrete mixer truck
The shell of the can is made of very wear-resistant steel. In order to automatically load and unload the concrete, special-shaped rotating blades are also welded inside. When rotating, the concrete will move in the direction of the rotation of the blades, allowing various materials to be fully mixed and stirred during continuous rotation and turning.
During feeding and transportation, the tank body rotates forward, and the concrete will move inward with the blades. During the discharge process, the tank body will reverse, and the concrete will be discharged outward along the blades.
The rotation of the tank is done by the hydraulic drive system on the truck. Usually, the hydraulic pump is driven by the power output shaft on the truck to drive the stirring tank to rotate.
We can often see various traffic accidents about concrete mixer trucks in various reports, which also caused a lot of casualties. The main reasons are that the entire chassis of the concrete mixer truck is very high, and the driver will have many blind spots during the operation, especially when turning.
Also, concrete mixer trucks are generally faster, and the body and heavy concrete are loaded with heavy concrete, which will cause longer braking distances, etc., which are all the causes of frequent accidents.
So, for safety, you should stay away from the concrete mixer truck as much as possible.
The picture in the article is taken from Youtube "History of Ready Mix" "HOW IT WORKS Concrete"
The gif in the article is taken from Youtube "History of Ready Mix" "Technology for Concrete Mixers ZF ECOMIX"
