Research On The Main Control System Of Electronic-hydraulic Controller For Hydraulic Supports Used In Unattended Fully Mechanized Coal Face

The project in this thesis is not only an important part of the project "a complete range of the equipments and key technology in the fully-mechanized coal face with capacity of annual production of 10 million tons", sponsored by the National Key Technology R&D Program of China during the Eleventh Five-year Plan Period " (NO.:2007BAK29B05; 2007 BAB13B01), but also an important part of the Action project that is a scientific and technical personnel services company project "Coal Face unattendedn Electric and Hydraulic Control System" (NO.:2009GJA30028). It is available for the face made of Mine Electric and Hydraulic control system reliability is low, real poor, import picking Electric and Hydraulic controller is not timely, communication protocol is not open, upgrade difficulties and other issues raised. With the 10 million-ton mine high yield and high automation of the continuous emergence of coal face, Single face matching the number of hydraulic support increasing, the electronic-hydraulic controller for hydraulic supports have a higher requirement. Currently, domestic electronic-hydraulic control system for hydraulic support of fully mechanized coal face has poor feature of real time response and reliability and develop slowly, the imported device has the shortcomings of high cost, long supply circle, non-public Communication Protocol, inconvenient upgrade, bad adaptability to our mine, which seriously restrict the development of China coal industry. Therefore, electronic-hydraulic controllers with intellectual property rights, which are suitable for mine of china have great significance to our country.In order to solve these issues, and promote the rapid development of coal industry, the project in this thesis developed the monitoring section on "the main control system of electronic-hydraulic controller for hydraulic supports used in unattended fully mechanized coal mining face", design the laboratory bench and test the function of the main control system of electronic-hydraulic controller, the results of testing show that the performance index can meet the design requirements. The mainly research works are showed as follows:Functions and specifications of the master system that the main control system for hydraulic supports in unattended fully mechanized coal mining face needed are determined according to the actions of shearers and hydraulic supports, environment of working face, proposal of operators, functions of imported supports.Around the principle of strong stability, easy operability and high flexibility, according to the status quo, characteristics and equipment distribution of the unattended fully mechanized coal mining face, propose the control strategy which is three levels network of intelligent monitoring and control, including ground monitoring room set for hydraulic support, underground control room set for coal mine and electronic-hydraulic controller for fully mechanized coal face is formulated. Among them, electronic-hydraulic controller has the highest priority, then the underground and finally the ground room.CPU for master system is selected by comparison. Minimum system,extending RAM circuit, A/D sampling circuit, switching value input and output circuit, communication circuit with SPI and RS485, undervoltage and overvoltage circuits are designed based on the core CPU. Ant-jamming hardware is included and the stability of systems operation is enhanced.Master control program, A/D sampling subroutine, communication subroutine with SPI and RS485, extending RAM subroutine, CRC checking subroutine and various processing subroutine are designed according the idea of function modularization. System debugging and upgrade is convenient, routine scanning cycle is shortened and system running efficiency is promoted.Experimental platform which includes six hydraulic supports controller was designed and the main control system of hydraulic support electronic-hydraulic controllers was holistic debugged. The results of debugging indicated that the system with rational organization, data acquisition instant and accurate, control response safe and reliable, data communication steady and efficient, system maintenance convenient and fast. All of these lay a foundation for the realization of the unattended fully mechanized coal mining face.