Concrete mixing plant is mainly composed of 5 major systems, such as a mixing host, a material weighing system, a material transport system, a material storage system, and a control system, and other subordinate equipment.
Mixing host
The Concrete mixing plant is divided into forced mixing and self-falling mixing according to its mixing method. The forced mixing machine is a dry stream currently used in mixing stations at home and abroad. It can mix a variety of concrete such as fluidity, semi-dry rigidity and dry rigidity. The self-falling mixing machine mainly mixes liquid concrete, which is rarely used in mixing stations now.
Forced concrete mixing plant are divided into spindle planetary mixers, single-horizontal shaft mixers and double-horizontal shaft mixers according to the construction method. In the meantime, the induction performance of the double-horizontal-shaft forced mixer is the best.
2. Material weighing system
Material weighing system is a key component that affects the quality of concrete and the cost of concrete production. It is mainly divided into three types: aggregate weighing, powder weighing and liquid weighing. Under normal circumstances, the mixing station below 20 cubic meters per hour uses the superimposed weighing method, that is, a scale for aggregate (sand, stone), a scale for cement and fly ash, and water and liquid additives separately weigh , Then put the liquid admixture into the water weighing bucket to pre-mix. In mixing stations above 50 cubic meters per hour, the weighing method of each weighing material is mostly used. All weighings are controlled by electronic scales and microcomputers. Aggregate weighing accuracy is ≤2%, and the weighing accuracy of cement, powder, water and admixtures is ≤1%.
3. Material Handling System
Material delivery consists of three somewhat:
1. Aggregate transportation; there are two methods of hopper transportation and belt transportation for mixing station transportation. The advantages of hopper progress are small footprint and simple structure. The advantages of belt conveying are large conveying interval, high efficiency and low failure rate. Belt conveyors are mainly suitable for mixing stations with temporary storage bins, and then improve the productivity of the mixing stations.
Second, the transportation of powder; the available powder for concrete is mainly cement, fly ash and mineral powder. The powder transportation method commonly used now is [1] transportation, and large-scale mixing buildings use pneumatic transportation. The advantages of spiral transportation are simple structure, low cost and reliable operation.
3. Liquid transportation mainly refers to water and liquid admixtures, which are transported separately by water pumps.
4. Material storage system
The material storage methods available for concrete are fundamentally the same. Aggregates are piled up in the open air (there are also closed silos for urban large-scale product concrete mixing stations); powders are stored in fully-enclosed steel structure silos; admixtures are stored in steel structure containers.
5. Control system
The control system of the concrete mixing station is the central nerve of the entire equipment. The control system has different functions and preparations according to the different requirements of the user and the size of the mixing station. Generally, the control system of the small mixing station available at the construction site is simple, while the system of the large mixing station is relatively messy.
Concrete mixing plant effect
Concrete mixing plant is a combined equipment used to gather mixing concrete, also known as concrete precast yard. Because of its high degree of mechanization and automation, its productivity is also high, and it can ensure the quality of concrete and save cement. It is often used in large, medium-sized water conservancy, power, and bridge projects such as large concrete projects, long construction periods, and construction sites. . With the development of municipal construction, the selection of mixing stations that gather and mix concrete and supply products has great advantages, so it has been rapidly developed, and created conditions for the implementation of concrete pumping construction and the realization of mixing, transportation and pouring machinery.
