Reasonable Selection of Concrete Mixing Plant

1. Overall selection principle
   
   (1) production scale
   
       According to the size of the production scale to determine the capacity of concrete mixing plant. The annual output of 200,000 m3, the annual output of 200,000 m3 the following, concrete mixing equipment productivity is generally not less than 90m3 / h; annual output of 200,000 to 300,000 m3, concrete mixing equipment productivity is generally 120m3 / h; annual output of 300,000 m3 or more, concrete mixing equipment productivity Is 150m3 / h or 200m3 / h.
   
   (2) construction site
   
       According to the size of the construction site, you can choose concrete mixing plant or concrete mixing plant. The production capacity of the mixer is higher than that of the mixing plant. The overall shape is neat and beautiful. The material yard covers an area of ​​small. The production environment is good, but the manufacturing and installation cycle is long and the one-time investment is high. Selection of concrete mixing station, aggregate to be upgraded twice, flexible layout, manufacturing, installation cycle is short, one-time investment costs are low, but the yard covers an area of ​​large, poor production environment.
   
   (3) the equipment
   
       According to the conditions of equipment to select the concrete mixer specifications and working size. Mixing truck loading capacity should be matched with the material out of the mixer capacity, improper matching will affect the work efficiency. Loader loading capacity should be with the concrete mixing station to match the feeding station height.
   
   (4) management functions
   
       If the use of intensive network management, concrete mixing equipment should be considered the network management functions, to avoid future upgrades difficult.
   
   (5) equipment technical performance
   
       Mainly from the advanced equipment, reliability, excellent and versatile several considerations. Equipment should have a working principle of advanced, high degree of automation, management, powerful and environmentally friendly performance characteristics. Equipment should be configured excellent, reliable control, applicability, and maintainability. In addition, we must consider the high precision, good mixing quality, high production efficiency, low energy consumption, the use of standard parts, good interchangeability.
   
   (6) supplier reputation
   
       Including whether the installation is rigorous; technical guidance and training is in place; after-sales service is timely; spare parts supply is sufficient.
   
   (7) performance and low cost
   
       It is not advisable to pursue the technical performance of the equipment comprehensively, it will increase the unnecessary investment, but it is not advisable to pursue the low investment to reduce the technical performance of the equipment and bring the increase of the cost. The current domestic market, the overall performance of imported equipment is higher, but the price is more expensive. Domestic equipment in several well-known brands, although the overall performance can not be compared with imported equipment, but the key parts of the configuration is also commonly used imported components, the main performance is not much worse than the imported equipment, the price is much lower. More reasonable approach is to choose the appropriate cost performance.
   
   2. Selection of key components
   
   (1) Mixers for commercial concrete mixing plants
   
       Forced Mixer Good mixing quality, overload capacity, discharge without segregation, high production efficiency, can adapt to a variety of properties of concrete mixing, the current commercial concrete mixing equipment commonly used forced mixer. But its structure is more complex, the use of higher cost. Forced mixer is divided into two horizontal axes, single horizontal shaft, single vertical shaft and planetary form. The double horizontal shaft mixer has the advantages of good stirring performance, high production efficiency, good adaptability, outstanding structural features, good reliability, Commercial concrete production; single horizontal shaft mixer and single vertical shaft mixer because of its structural characteristics and adaptability in the commercial concrete mixing equipment has been less and less: the current application of planetary mixer is not common, more common in imported equipment.
   
   (2) commercial concrete mixing equipment, electronic control system
   
       At present, the domestic concrete mixing station electronic control system in a variety of forms, mainly in the following three control methods based.
   
       A, distributed type microcomputer control: This kind of control form in the early mixing station design widely applies. The core of the control system for the programmable controller, a computer only as a management report printing, the computer's function and role is not very obvious. With the wide application of commercial concrete, the concrete mixing station functional requirements more and more complex, this form of control applications is very difficult.
   
       B, centralized computer control: This form of control computer control and management functions in a single computer, the task is relatively heavy, and the production process of statistical information on the report can not be synchronized, can not always statistical data, measurement by human factors Too much interference. Such as: the preparation of measurement and control procedures, signal amplifiers and A / D board accuracy, will affect the measurement accuracy.
   
       C, centralized dual microcomputer control: This form is to solve the measurement of human factors interference. The use of a dedicated control of the ingredients of the instrument, and the production control and management functions in the two sub-computer, do not interfere with, production control and reporting statistics simultaneously, and management computer can also be used as a production backup machine, with a higher level The computer's network interface.
   
   3. Selection of other devices
   
   (1) Aggregate batching system
   
       As the silo feeding by the auxiliary equipment and the impact of the venue, the bunker volume should be larger.
   
       For the mixing station capacity of a single silo is generally greater than 20m3, if the use of belt conveyor or concrete warehouse can also be larger in order to reduce the stock yard covers an area. For a single hopper building volume is generally greater than 50m3. Concrete mixing station is generally composed of ingredients, its structure in two forms, all-steel structure ingredients on the ground ingredients, easy maintenance, easy drainage, but the feeding difficulties, the use of loader or belt machine feeding; Of the silo for the concrete structure, to warehouse ingredients, feeding convenience, easy to heat, but the maintenance difficulties, can be used loaders, bulldozers or dump truck directly on the material.
   
   (2) aggregate lifting system
   
       The belt conveyor and the hopper are generally used. The belt conveyor has high production efficiency, reliable performance, easy to be closed, not easily affected by climate, and low maintenance cost, but occupies a large area. Hoisting hopper is generally only used for mixing stations, compact structure, small footprint, but high maintenance costs, poor reliability, is currently in the large concrete mixing plant has been rarely used. There are also pattern belt and groove belt conveyor, the lifting angle can be greatly improved, the vertical belt groove can be improved, but because of its reliability and back to the material problem is not resolved, generally do not use.
   
   (3) Mix the main building
   
       Generally closed, equipped with centralized dust removal device, the cold region should also consider the requirements of winter construction cold, so insulation jacket. Open mixing station and simple mixing station, due to poor environmental performance, the current new commercial concrete mixing equipment has been rarely seen in some areas has been banned.
   
   (4) metering system
   
       At present using the weight measurement, divided into cumulative measurement and independent measurement of two forms. Accumulation measurement structure is simple, easy to maintain, feeding height is low, but can not control the measurement accuracy alone. Independent measurement of individual control measurement accuracy, structure is more complex, feeding a high degree of increase, the cost has increased.
   
   (5) powder storage and transportation devices
   
       Powder storage tank number and size should be configured according to need, generally determined by the type and supply of materials, powder cans should be equipped with material level controller. Generally, there are two kinds of powder conveying devices: pneumatic conveying structure is simple, feeding uniform, but long-distance transportation, air pressure is not easy to control; screw conveying conveying distance is long, easy to overall arrangement, reliable, the vast majority of mixing stations or stirring Building are using screw conveyor.
   
   (6) matching pieces
   
       Selection of components often determines the reliability of concrete mixing equipment. General accessories should be selected high reliability of the well-known brands, especially the main parts. For domestic equipment, electronic components, sensors, cement disc valve, and even the reducer mixer, lubricating components imported components, more reliable.

Zhengzhou Xinfeng Machinery Co., Ltd. Main concrete mixer, concrete mixing station, stabilized soil mixing station, concrete batching machine, concrete conveying equipment, please call to discuss!