Concrete mixer introduction and classification

A concrete mixer is a machine that mixes and mixes cement, sand aggregate, and water into a concrete mix. Mainly consists of mixing cylinder, feeding and unloading mechanism, water supply system, prime mover, transmission mechanism, rack and supporting device.

According to the nature of the work, batch type (batch type) and continuous type; according to the principle of mixing, self-falling type and compulsory type; according to the installation method, fixed type and movable type; according to the way of discharging materials, it can be divided into tilted type and non-tilted type; According to the structure of the mixing bowl, it can be divided into pear type, drum type, double cone type, disk vertical axis type and round groove horizontal axis type.

1, according to the nature of work:

(1) Periodic working mixer; (2) Continuous working mixer.

2, according to the principle of mixing:

(1) Self-disengager mixer; (2) Forced mixer.

3, according to the shape of the mixing barrel:

(1) drum type; (2) cone type; (3) disc type.

In addition, the mixer is also divided into split-type and round-type (that is, horizontal axis) mixer.

Self-allocating mixers have a long history. As early as the beginning of the 20th century, drum-type concrete mixers driven by steam engines have begun to appear. After the 1950s, double-cone mixers and split-powder mixers, such as reversal and tilting discharge, were introduced and developed. On the inner wall of the mixing cylinder of the self-propelled concrete mixer there are radially arranged stirring blades. During work, the mixing cylinder rotates around its horizontal axis, and the material added into the mixing cylinder is lifted to a certain height by the blade and then falls by its own weight. This is a repeated movement that achieves a uniform stirring effect. The self-dropping concrete mixer has a simple structure, and is generally based on agitated plastic concrete.

The forced blender has been rapidly developed and promoted since its rise in the early 1950s. The first to appear was a disc-shaft forced concrete mixer. This mixer is divided into turboprop and planetary. After the 1970s, with the application of lightweight aggregates, there appeared a round-shaft, horizontal-shaft forced mixer, which was divided into two types: single-shaft and twin-shaft, with both self-dropping and forced mixing. . The stirring blades have a low linear velocity, good wear resistance and low energy consumption, and develop rapidly. Forced concrete mixer is equipped with stirring blades on the shaft arm of the mixing cylinder, and the material in the mixing cylinder is added. Under the strong stirring of the mixing blades, a cross flow is formed. This stirring method is much stronger than the self-dropping stirring method and is mainly suitable for stirring dry hard concrete.

The continuous concrete mixer is equipped with helical stirring blades, and various materials are continuously weighed according to the mixing ratio and then fed into the mixer. The stirred concrete is discharged continuously from the discharge end. This blender has a short mixing time, high productivity and attractive development.

With the development of concrete materials and construction technology, many new types of concrete mixers have appeared one after another, such as steam-heated mixers, supercritical speed mixers, sonic mixers, rocking disc mixers without stirring blades and concrete mixers for secondary mixing. Wait.