Dongfang special steam mixer truck

A special truck used to transport concrete for construction; because of its shape, it is often called a snail or tanker. These trucks are equipped with cylindrical mixing drums to carry the mixed concrete.

During the transportation process, the mixing drum will always be kept rotating to ensure that the concrete carried will not set. After the concrete is transported, the inside of the mixing drum is usually rinsed with water to prevent the hardened concrete from taking up space and making the volume of the mixing drum less and less.

Structural principle

Concrete mixer truck-the structural principle of the concrete mixer truck. The concrete mixer truck is composed of an automobile chassis and a special device for concrete mixer transportation. The chassis of the concrete mixer truck produced in my country mostly adopts the second-class universal chassis provided by the vehicle manufacturer. Its special mechanism mainly includes power take-off, front and rear brackets of mixing drum, reducer, hydraulic system, mixing drum, control mechanism, cleaning system, etc. The working principle is that the power of the chassis of the car is taken out through the power take-off device, and the variable pump of the hydraulic system is driven to convert the mechanical energy into hydraulic energy to the quantitative motor. The motor then drives the reducer, the reducer drives the stirring device, and then the stirring The mixing blades in the tank mix the concrete.

Power take-off

The domestic concrete mixer truck adopts the power take-off mode of the main engine. The function of the power take-off device is to take out the power of the engine by manipulating the power take-off switch and drive the mixing drum through the hydraulic system. The mixing drum rotates in the forward direction during feeding and transportation to facilitate the feeding and mixing of the concrete. Rotation, cut off the power connection with the engine after the end of the work.

Hydraulic system

The engine power taken out by the power take-off is converted into hydraulic energy (displacement and pressure), and then output by the motor as mechanical energy (rotation speed and torque) to provide power for the rotation of the mixing drum.

Reducer

After decelerating the output speed of the motor in the hydraulic system, it is transmitted to the mixing drum.

Operating mechanism

(1) Control the rotation direction of the mixing drum so that it rotates forward during feeding and transportation, and reversely rotates when discharging.

(2) Control the rotation speed of the mixing drum.

stirring equipment

The mixing device is mainly composed of a mixing drum and its auxiliary supporting parts. The mixing drum is a container for loading concrete. When rotating, the concrete moves in the spiral direction of the blades, and is mixed and stirred during the continuous lifting and turning process. During the feeding and transportation process, the mixing drum rotates forward, and the concrete moves inward along the blade. When discharging, the mixing drum reverses and the concrete is discharged outward along the blade.

The blade is the main component of the mixing device. Damage or severe wear will cause uneven mixing of the concrete. In addition, if the angle of the blade is not designed properly, it will also cause the concrete to segregate.

The main function of the cleaning system is to clean the mixing drum, and sometimes it is also used for the dry material mixing drum during transportation. The cleaning system also cools the hydraulic system.

Edit this section of the classification of concrete mixer

According to the moisture content of the concrete transported by the concrete mixer, there are three types of mixer trucks: wet type, dry type and semi-dry type. Wet material concrete mixers are mostly used in China. It can load concrete produced by the mixing plant (station) or aggregates (sand, stones), cement and water mixed in proportions. During the transportation process, the wet material is slowly Mixing to prevent the initial setting and segregation of concrete during transportation. However, the time from concrete production to pouring is generally not more than 1.5h to avoid concrete setting. Therefore, in the case of longer distance transportation, dry and semi-dry material mixing trucks are required for transportation. The dry-type mixer truck can directly load dry aggregate and cement into the mixing drum of the truck according to the ratio. During the transportation process, the dry material in the drum is mixed. When the vehicle is about to reach the construction site or add water to the construction site Complete the mixing of concrete. The aggregate and cement in the concrete transported by the semi-dry mixer truck are also formulated according to the ratio and contain a certain amount of water, but the water content does not meet the pouring requirements. The vehicle will reach the construction site or the construction site Add water and stir.

classification

According to the moisture content of the concrete transported by the concrete mixer, there are three types of mixer trucks: wet type, dry type and semi-dry type. Wet material concrete mixers are mostly used in China. It can load concrete produced by the mixing plant (station) or aggregates (sand, stones), cement and water mixed in proportions. During the transportation process, the wet material is slowly Mixing to prevent the initial setting and segregation of concrete during transportation. However, the time from concrete production to pouring is generally not more than 1.5h to avoid concrete setting.

Therefore, in the case of longer distance transportation, dry and semi-dry material mixing trucks are required for transportation. The dry-type mixer truck can directly load dry aggregate and cement into the mixing drum of the truck according to the ratio. During the transportation process, the dry material in the drum is mixed. When the vehicle is about to reach the construction site or add water to the construction site Complete the mixing of concrete. The aggregate and cement in the concrete transported by the semi-dry mixer truck are also formulated according to the ratio and contain a certain amount of water, but the water content does not meet the pouring requirements. The vehicle will reach the construction site or the construction site Add water and stir.

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