Two-component Proportional Valve
Introduction:
Features:
Unique design of valve body, make material conveying more smoothly.
The performance of solenoid valve is so stable that the air cylinder acts accurately to ensure a proportional mixing of new and
Instant recycling the regrind materials to reduce the production cost.
Control box is optionally available when performing in other situations.
Equipped with 1~4 levels working function selection, making material mixing more evenly.
Two-component Proportional Valve Proportional Valve, Proportional Valve Controller, Two-component Proportional Valve Ningbo Beilun Rhong Machinery Manufacturing Co., Ltd. , https://www.rhongmachinery.com
Since the 1950s, China's mine ventilation theory and technology research has made the following major progress.
(1) Extensive research and measurement of the ventilation resistance of the roadway.
(2) Established turbulent mass transfer equations and pollutant concentration analysis and calculation methods for various working surfaces, which provided a theoretical basis for wind calculation methods.
(3) The application of electronic computers to calculate and analyze complex ventilation networks provides an effective method for mine ventilation system analysis.
(4) The theory and technology of jet ventilation have been developed, and the technology of directional adjustment of wind flow pressure and control of wind flow has been applied.
(5) The research on the law of unsteady flow of wind flow during mine fire has been deepened, and several typical airflow control schemes have been established.
(6) The theory of controlled circulation ventilation promotes the development of air purification devices and the development of pollution source control technologies.
(7) The theory and technology of deep well heat source, air and surrounding rock heat exchange and mine thermal environment control have made great progress, and the theoretical system of intra-mineral thermodynamics has been initially formed.
(8) Research on artificial intelligence technology for mine ventilation system optimization and control.
(9) Research on the theory and technology of open pit mine ventilation.
2. Progress in research on mine ventilation energy-saving technology
(1) Multi-fan multi-stage station
The multi-fan multi-machine station has remarkable advantages, which can not only improve the effective air volume rate of the mine, but also save power consumption. Experimental Study of China since the beginning of ventilation technology in 1983, there have been dozens of large and medium non-coal mine using this technology to transform the existing ventilation system, we have made significant social and economic benefits.
(2) Controlled air recirculation technology
In the past, it was thought that the circulating airflow was a dirty airflow, which caused the accumulation of pollutants in the underground working environment and was banned. However, since SL Leach and A. Iack of the United Kingdom in 1964, the concentration of pollutants in the ventilated working face was only After the conclusion that the intensity of the pollutants on the working face is related to the fresh air volume entering the working surface and not related to the size of the circulating air volume, people have an essential understanding of the circulating airflow, so in the United Kingdom, the former Soviet Union, the United States, South Africa, Canada and other countries have carried out theoretical analysis and field test research on the use of circulating airflow ventilation. The results show that the controlled circulation ventilation method is a practical and feasible new ventilation method, which can not only solve the difficult problem in the conventional ventilation method. The ventilation technology is difficult, and it has significant energy saving effects.
(3) Joint work of primary and auxiliary fans
The joint work of main and auxiliary fans is an effective way to ventilate and save energy. RJRearee conducted a computer simulation study in the UK and made 12 simulation plans. The results show that the combined work of main and auxiliary fans is used to replace the traditional curved ground main fan ventilation. It can ensure that the air volume in the working area is constant, and the pollutant concentration does not exceed the standard. The annual operating cost is reduced to 18.5%, and the pollutant concentration is only increased from 1% to 1.176% (the air circulation coefficient of the working area is 15). %).
(4) Take measures to reduce windage
In the high-resistance section of the maximum resistance route, the resistance reduction measures of the enlarged roadway section are used to receive the obvious effect of reducing the resistance, and the local resistance reduction engineering is small. The ventilation structure with good aerodynamic performance is also adopted in the main return air passage with high wind speed. Can receive good resistance reduction effect.
(5) In 1985 the mine ventilation system in old tin mine in southern plant design, promote the use of K35 fans come out with energy-efficient fan, these fans has increased over K45 fan performance, so fan selection mainly K35 fan. In 1988, the K40 fan was developed. This type of fan is better than the first two. In 1990, the FS series fan without hump was developed, which adopted the steady flow ring structure, which eliminated the rotating stall phenomenon of the traditional axial fan in the high wind resistance zone. The wind pressure characteristic curve is relatively smooth, which is more suitable for the combined operation of multiple fans. .
(6) Analysis and optimization of mine ventilation system
The optimization research of natural wind network is still in the theoretical exploration stage. Its research has theoretical and practical guiding significance for mine ventilation design, planning and management, and has a direct impact on energy conservation and ventilation cost reduction. It is worthy of attention. Research area.
RPV series proportional valves mix regrind and new materials in a proper proportion, and then send them back to the molding machine to achieve a proportional mixing and loading effect. It features directly mounted on loaders or mounted on the pipeline. Besides, it is applicable to Euro loaders and has to equip control box to perform when in other situations.
"European type" design, classy appearance, easy installation and operation.
regrind materials.
New development of mine ventilation technology
1. Progress in mine ventilation theory and technology research