A choice, general principle of concrete mixing station
1, according to the production scale selection
To determine the concrete mixing equipment production capacity according to the scale of the production. The annual output of less than 200000 m3, generally not less than 90m3 / h concrete mixing equipment productivity; the annual output of 20 m3 in case 300000, concrete mixing equipment productivity is 120m3 / h; the annual output is more than 300000 m3, concrete mixing equipment productivity is 150 m3 / h or 200m3 / h.
2, according to the construction site selection
According to the construction site of the size, can choose the concrete mixing building or concrete mixing station. The concrete mixing building, aggregate a promotion, the same capacity is higher than the productivity of stand mixer mixing, the overall shape is neat and beautiful, the material field covers an area of small, good production environment, but manufacturing, installation of a long cycle, the high cost of investment. The concrete mixing station, aggregate two times improve, flexible layout, manufacturing, installation period is short, the one-time investment cost is low, but the material field covers an area of large, poor production environment.
3, according to the configuration of equipment selection
To select the specification and size of the concrete mixer according to the assigned work equipment. The loading capacity of mixing truck should be matched with the ability of material mixer, improper matching will affect the work efficiency. The loader feeding capacity should be matched with the height of concrete mixing station feed batching station.
4, according to the management function
If the use of intensive network management, should consider concrete mixing equipment network management functions, to avoid difficulties for the future upgrade.
5, according to the technical characteristics of the equipment selection
Mainly from the equipment advanced, reliability, excellent performance and versatility of several considerations. The equipment should have advanced working principle, high degree of automation, powerful management and good environmental protection performance characteristics. Equipment shall be equipped with excellent, reliable control, strong applicability, can repair the good performance. In addition, but also consider the high measurement accuracy, good mixing quality, high production efficiency, low energy consumption, the use of standard parts of large quantity, good interchangeability.
6, according to the supplier credit
Including the installation and debugging is strict; technical training is in place; after sale service is timely supply of spare parts is sufficient.
7, the ratio of performance to price
The pursuit of comprehensive technical performance of the equipment is not wise, will increase the cost, but only the pursuit of low investment and reduce the technical performance of the equipment will bring cost increases, this approach is not desirable. The comprehensive performance of high current domestic market of imported equipment, but the price is more expensive. Domestic equipment in several well-known brands, although the performance can not be compared with the imported equipment, but the key parts of the configuration are generally imported components, the main performance is not much worse than the imported equipment, the price is much lower. A reasonable solution is to choose the right price performance ratio.
Two, concrete mixing station selection principle of key components
Mixer 1, commodity concrete mixing equipment
Compulsory mixer mixing quality, strong overload capacity, discharge without segregation, high production efficiency, can adapt to a variety of properties of concrete mixing, the concrete mixing equipment widely used in forced mixer. But its structure is more complex, higher cost. Compulsory mixer consists of twin shaft, single horizontal shaft, vertical shaft and single planetary forms, twin shaft mixer mixing due to good performance, high production efficiency, good adaptability, structure characteristics, good reliability, is suitable for the production of concrete; the single horizontal shaft mixer and single shaft mixer because of its structural features and adaptability, in the concrete mixing equipment has been used less: planetary mixer used at present is not common, found in imported equipment.
2, control system of commercial concrete mixing equipment
At present, the station control system in various forms of domestic concrete mixing, mainly in the following 3 main control mode.
(1) and the control of distributed microcomputer control: this form is widely used in the design of mixing station early. The core of the control system is a programmable controller, a computer only as a management report, and function of the computer is not very obvious. With the wide application of commercial concrete, concrete mixing stations and the functional requirements of more and more complex, application of this type of control is very difficult.
(2): the control of microcomputer control, centralized control and management function of computer will focus on a computer, tasks are relatively heavy, simultaneously cannot report data and statistics on the production process, not any statistical data, the measurement of artificial interference too much. For example: the preparation of measurement control program, signal amplifier and A / D board precision will affect the measurement accuracy.
(3) and the control of dual microcomputer centralized: this form is to solve the man-made interference measurement aspect. The special ingredients and control instruments, production control and management functions on two computers, do not interfere with each other, the production control and report statistics, synchronization, and management of computer production can also be used as a backup machine provides a network interface and a computer.
The selection principle of other devices, three
1, aggregate batching system
Because the hopper feeding affected auxiliary equipment and site selection should be larger, bin volume. The mixing station single bin volume is generally greater than 20m3, if the use of belt material or concrete Dicang can also get larger, in order to reduce the stockyard area. For a single batching bin volume is generally greater than 50m3. General station by station proportioning concrete mixing ingredients, its structure has two kinds, all steel structure batching station using ground ingredients, convenient repair, easy drainage, but feeding difficulties, the material loading machine or belt machine; steel reinforced concrete silo structure for concrete batching station structure, Dicang ingredients, feeding convenient, easy to heat, but difficult to repair, the loader, bulldozer or truck loading directly.
2, aggregate lifting system
The general belt conveyor belt conveyor and lifting hopper, high production efficiency, reliable performance, easy sealing, not easy to be affected by climate, low repair cost, but large area. The hopper is usually only used for mixing station, compact structure, small occupied area, but the high cost of repair, poor reliability, is currently in a large concrete mixing station has been rarely used. At present there are adopting pattern belt and trough belt conveyor, lifting angle can be improved greatly, the trough belt can be vertical, but because of its reliability and material issues not resolved, the general is not much.
3, mixer
The general is totally enclosed and equipped with centralized dedusting device, cold areas should also be considered cold winter construction requirements, make exterior insulation. Open type mixing station and simple type mixing, due to poor environmental performance, the new commercial concrete mixing equipment has rarely been seen, and has been banned in some areas.
4, the measurement system of concrete mixing station
The weight measuring method, divided into two independent and cumulative measurement measurement form. Cumulative measurement has the advantages of simple structure, easy maintenance, low feeding height, but can't control the measurement accuracy. Independent metering separate control precision, complex structure, feeding height increased, the cost increase.
5, powder material storage and conveying device
Tank number and size should be based on the need to configure the powder, generally by the kinds of materials and supplies to decide, should be with the powder tank material level controller. Powder conveying device generally has the following 2 types: pneumatic conveying has the advantages of simple structure, uniform feeding, but long distance transportation, the pressure is not easy to control; spiral conveyor conveying distance long, easy overall arrangement, reliable work, the vast majority of the mixing station or by mixing screw conveyor.
6, concrete mixing station fittings fittings selection often determine the reliability of concrete mixing equipment.
General parts should choose high reliability of well-known brands, especially the main accessories. For domestic equipment, electronic components, sensors, cement mixer and butterfly valve, reducer, lubricating components and other imported components, more reliable.
In a word, if you want to buy a set of quality guaranteed concrete mixing equipment needs to consider many aspects of the factors from the aspects of. The only way to choose a quality product.