Research On The Net Control System Of Electro-Hydraulic Controller For Hydraulic Supports

The project in this thesis is not only an important part of the science and technology key project of Shan Xi provice"coal face unattendedn electric and hydraulic control system" (NO.:20110321005-07), but also an important part of the major special project of Shan Xi provice "research of technology and equipment in domestic fully mechanized working face" (NO:20111101024).It is proposed based on the fact of the low reliability,poor real time and poor anti-interference of most of domestic electro-hydraulic control systems for hydraulic supports and unable to meet the require of high yield and efficient coal face. With the development of the coal industry, achievement of high yield and efficient coal face is the direction of the mine development in China. So far, the research of China’s electro-hydraulic control system for hydraulic supports has lasted a very long time, but domestic electro-hydraulic control systems for hydraulic supports is not used in the mine, many electro-hydraulic control systems for hydraulic supports used in the coal face mainly depend on imports, severely constrain the popularity of the high yield and efficient mechanized coal face. Therefore, the research of electro-hydraulic control systems for hydraulic supports with independent intellectual property rights is of great practical significance.In order to solve the problems above, the project in this thesis developed the "net control system of electro-hydraulic controller for hydraulic supports",the main contents as follows:According to a large number of literatures and the existing mechanized coal face of the electro-hydraulic control system, functional requirements and technical specifications of the electro-hydraulic control system for hydraulic supports are determined, then the control mode and overall scheme of electro-hydraulic control system are designed.The project in this thesis determines the overall scheme of hardware circuit of electro-hydraulic controller for hydraulic supports, designs each functional module of the controller hardware circuit, include CPU minimum system circuit、keyboard scanning circuit、LCD liquid crystal display circuit、emergency stop and lockout circuit、RS485 communication circuit between controllers, external RAM circuit, input and output circuit. Besides,Feasibility and stability of the hardware circuit have been verified by experiments.Designed by the means of Modular Programming, the project in this thesis designs the main program and each branch-module program for the system, include keyboard scanning subroutine、LCD liquid crystal display subroutine、emergency stop and lockout subroutine、RS485 communication subroutine、SPI communication subroutine and upgrading program online subroutine, and feasibility and stability of the programs have been verified by experiments.According to function requirements, a test platform of the electro-hydraulic controller in hydraulic supports system is built and system debugging has been completed in the laboratory. And on that basis, a comprehensive test on the system is finished in the assemble workshop of JinMeiJinDing company. The results of debugging indicated that the electro-hydraulic control systems for hydraulic supports with scientific and rational organization, action operation convenient and agile, function operation reliable and timely, and data communication stably and efficient, so it is a system with a high practical value.