What is a concrete batching plant?
 
Concrete batching plant is a kind of electromechanical equipment that measures cement, water, aggregates, admixtures and other materials according to the concrete ratio requirements, and then mixes them into qualified concrete. The concrete batching plant includes parts such as material conveying, metering, storage, mixing, auxiliary and control systems. Concrete batching plants are mainly used for railways, bridges, airports, tunnels, water conservancy projects, soil industry, mining and civil construction, as well as the production of commercial concrete and concrete products.
 
Concrete batching plants have many layouts and specifications. For example, it can be divided into hydraulic station, nuclear power station, high-speed railway station, pipe pile station, engineering station and commercial mixed station according to different use. According to the convenience of relocation, it can be divided into mobile station and fixed station. According to the number of mainframe configuration, it can be divided into double station and single station.
 
The development history of concrete batching plants
 
In 1796, after the British Aspudin invented "Portland cement" and the British J.parker invented "Roman cement", the concrete mixing station was born. In the early days, the mixing form of the concrete batching station was a single-machine mixing, and it really changed to the centralized mixing mode after the commercial concrete was applied. Germany was the first to use commercial concrete, and the world's first commercial concrete batching plant was established in 1903 in Stasbel. In the early stage of the construction of the station, dump trucks or motorized dumpers were used to transport concrete, which made it difficult to guarantee the quality of concrete. From the 1960s to the 1970s, the economies of all countries in the world developed rapidly, and commercial concrete also developed rapidly. By 1973, there were 3,533 commercial concrete mixing plants in Japan and 10,000 in the United States. From the 1980s to the 1990s, Japanese commercial concrete dropped by 21% compared with 1973, and tended to be saturated. So far, the number of mixing plants in Japan has remained at around 5,000.
 
Concrete batching plants started relatively late in China. Vertical shaft scroll mixers were produced in the mid-1960s, horizontal shaft mixers were produced in the early 1980s, and planetary vertical shaft mixers were produced in the mid-1990s. In the mid-1980s, with the rapid development of the economy, concrete batching plants developed rapidly. At this time, the mixing host of the mixing station is mainly based on single and double horizontal shafts, and the weighing is mainly based on electronic scales and mechanical electronic scales. The system has the form of industrial computer, single chip and so on.
 
Classification of finished products of concrete batching plant
 

There are various installation forms of concrete batching plant products. Generally, they can be divided into mobile concrete batching plant, stationary concrete batching plant, ship-mounted concrete batching plant and foundation-free concrete batching plant according to the fixed form.
 
The mobile concrete batching plant has good mobility and can be moved at any time. It is suitable for all kinds of construction sites where the amount of concrete is small and the construction period is short, so it usually needs to be equipped with a walking device.
 


The stationary concrete batching plant is fixed on the equipment foundation by bolting or welding, and is mainly used in large prefabricated component factories, commercial concrete factories and water conservancy engineering sites.
 


Ship-mounted concrete batching plants are generally used in the construction of cross-river bridges and large-span sea-crossing projects. This type of mixing equipment is suitable for concrete construction in wide waters far away from the land. It can be moved with the barge in the construction waters, and various types of concrete can be mixed.
 
The installation of the chassis of the foundation-free concrete batching plant is not connected to the foundation of the equipment site where it is located, the equipment can be disassembled and installed quickly, and the amount of foundation construction is small. This type of concrete batching plant is generally fixed on the installation chassis.
 
2. Classification according to the characteristics of concrete
 
According to the characteristics of the concrete produced, it can be divided into hydraulic station, nuclear power station, commercial concrete station, high-speed railway station, etc.
 
Hydraulic station refers to the mixing station mainly used for mixing dam concrete production. The concrete used for other auxiliary facilities of the power station such as culverts, slopes, roads, etc. is not much different from the general engineering concrete. However, the concrete aggregates used in the construction of hydropower dams are larger in particle size and require more aggregate gradation. In order to enable the mixing host of this type of mixing plant to withstand the impact of large blocks, the number and angle of the mixing arms have been adjusted to some special arrangements.
 
The concrete required for the construction of nuclear power stations is usually divided into two categories: conventional and nuclear power station. The concrete required for nuclear power station has high performance, and the concrete poured is thick and large. Therefore, an ice-making system needs to be equipped, and the temperature and mixing of the machine should be adjusted. The process has special requirements.
 
The commercial concrete batching plant is used to produce ordinary commercial concrete. It belongs to the most common concrete mixing equipment and has the widest application range. The high-performance concrete produced in high-speed railway stations is mainly used for high-speed railway construction. The high-speed rail mixing station must be measured separately to meet the high requirements for the measurement accuracy of various materials. The production process of concrete suitable for high-speed rail construction is complex, and the mixing cycle is relatively long, generally 2-3 times that of ordinary commercial mixing stations. In general, the mixing efficiency is lower than that of ordinary commercial concrete stations, only 1/3 to 1/2 of that of ordinary commercial concrete stations.

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