Concrete mixer is a machine that mixes cement, gravel aggregate and water to make concrete mixture. It is one of the most commonly used construction machinery. This article introduces the classification, function and mixing quality of concrete mixer.
1. Classification of concrete mixer
According to the nature of work, it can be divided into batch type (batch type) and continuous type; according to the mixing principle, it can be divided into free fall type and forced type; according to the installation method, it can be divided into fixed type and mobile type; according to the discharge method, it can be divided into tipping type and non-tipping type; According to the mixing drum structure, it can be divided into pear type, drum type, double cone, disc vertical shaft type and circular groove horizontal shaft type.
1. According to the nature of work:
(1) Periodically working mixer;
(2) Continuous working mixer.
2. According to the mixing principle:
(1) Self-standing 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-cylinder type and round groove type (ie horizontal shaft type) mixer.
Second, the function of the concrete mixer
1. Make each component macroscopically and microscopically uniform
2. Destruction of cement particle agglomeration and promote the development of dispersion phenomenon
3. Destruction of the initial hydrated film coating on the surface of the cement particles
4. Promote collision and friction between material particles and reduce the impact of dust film
5. Increase the number of times each unit of the mixing material participates in the movement and the cross frequency of the movement trajectory to accelerate homogenization
3. Mixing quality
In order to ensure the mixing quality of the concrete, it is required that the concrete mixture is mixed evenly, the mixing time is short, the discharge is fast, the residual amount is small, the energy consumption is low and the pollution is low. The main factors affecting the mixing quality of the concrete mixer are: the structural form of the mixer, the ratio of the mixing capacity of the mixer and the geometric volume of the mixing drum, the mixing procedure and position of the mixing material, the geometric angle of the configuration and arrangement of the mixing blades, the mixing speed and the blades The wear condition of the lining board, etc.
