Magneto-rheological fluid (MRF) is non-colloidal suspension. In this paper, it is introduced that MRF will produce magnetic coagulation at an applied magnetic field by analyzing the interact energy between particles in MRF, and the coagulation is chain-like flocculation. The main reason that MRF produced magnetic coagulation is the direction between chain-like structure and magnetic field is the same. According to the studies above, the formula of yield stress for MRF at an applied magnetic field can be deduced. It can be seen from the formula that there is a square relationship between yield stress of MRF and particle magnetization, and the yield stress of MRF is closely related with volume concentration. The conclusions above match the results of existing experiments very well.
The consistence of emulsion has great influence on the normal running and life of the equipment relying on emulsion. The paper introduces the current situation in development of detecting technique of emulsion in china. The literatures about various techniques of automatic supervisory system of emulsion proportioning have been compared, and the respective characteristics have been discussed. In this paper, the on-line detection methods for emulsion concentration and the recent progresses in the research on detecting technology of concentration of emulsion are reviewed. Involves the main content includes: the measurement technology of emulsion concentration and detecting and proportioning technique of emulsion.
The emulsion pump station is the power source of the hydraulic support and the hydraulic props of fully-mechanized mining face. Providing work medium such as high pressure and big flow for the system used liquid such as hydraulic support are its responsibility. This paper put forward a system can control the pressure of the emulsion pump station based on electro-hydraulic proportional relief valve. After applying the electro-hydraulic proportional relief valve technique, this system reconstructed the pipeline of pump station. In order to realize the control of pressure, this system used the PID controller in PLC technique to perform logical operations and finally controlled the unload action of overflow valve. This paper give a detailed design of the system, and then build a mathematical model based on the electro-hydraulic proportional pressure control system hardware and analysis the results of control using simulation software.
In accordance with the characteristics of coal-mine equipment lease management, an information system of equipment lease management is put forward based on the business process management (BPM) and B/S pattern. And on the basis of investigation to a lease management enterprise of a mining aggregation, the paper elaborates the design of the software function module and structure, and the realization of technology.
According to the requirements of National security Supervision department,aimed at the low safety factor and the backward of personnel management, a coal mine underground personnel management system has been developed. The system adopted the Industrial Ethernet and CAN bus for transmission medium, disposed and managed the data from substation in time. This article introduced the framework of Design software and the main functions module of the software and database structure.
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