| In China, coal is one of the basal energy resources, furthermore, thin seam which height is less than 1. 2 meters is greatly rich and widely distributed, and it is about at the percentage of 20% in all exploitable coal reserves. However, due to extraordinarily intricate geological condition and dicky exploitation environment, synthetical mechanized exploitation technology is not applied all the while, as a result, its exploitation efficiency is specially thin and its hidden trouble is really severe. As a core plant in synthetical mechanized exploitation technology, shearer that should be designed particularly aiming at thin seam, in this way, exploitation efficiency of thin seam will be highly enhanced, much more, the number of colliers in dangerous working face and accidents will be reduced effectively.Subject researched in this paper is derived from project "Key technologies and plants researched in synthetical mechanized exploitation for thin coal seam" (project No. 2006BAB16B03), a sub-project of "R&D on key technology and equipment of efficient extraction in coal resources" , which is supported by National Science and Technology. To achieve the exploitation height request for thin seam, which height is 0.8m, the height of shearer designed is only 0.6m. in addition, to furnish security for mechanical intensity and blast demands, actual height of electrical control cavity is merely 22 centimeters, so installation inter space is super narrow. Furthermore, owing to low weight of the whole shearer and stones in coal, mechanical librations should be taken into account in the design of electrical control system of shearer for expressly thin seam. At present, shearers which control center is PLC or industry control computer are widely applied at home. Functions of these shearers are in the extreme simple, and expansibilities of them are really bad, aside, connections are extraordinarily cockamamie and performances of anti-librations are not almost none. Consequently, these shearers can not meet the satisfactions for expressly thin seam. Thus, electrical control system should be contrived wholly.In the bases of demands for electrical control system of shearer in the expressly thin seam, and with combination of modern electronic techniques and advanced industry control techniques, the whole bran-new electrical control system is researched. Three fields of research and realization are included in this paper as follows:1. Distributed bus structure is applied, and the whole control systems are divided into several modules. CAN buses are used in connections and the structure is greatly flexible, in addition , expansibility is really mighty and functional modules can be easily replaced or added;2. ARM as the controller is adopted in shearer control for the first time, DSP as the control core is used in some modules at the same time. With combination of ARM and DSP techniques, powerful hardware platform is established for no-man working face and problem diagnosis in the future.3. Against special working circumstance of shearer for expressly thin seam, a large number of measures in electrical and mechanical designs are utilized to resist electromagnetic interference,mechanical vibration,dampness and blast, as a result, credible performance of electrical control system is ensured in the shearer.Capability test of the control system is put in practice in this paper, and reliability of the scheme is validated as well. Besides, test results and feed back from locale are analyzed and idiographic improvement is brought forward against objection in the design. Hence it also can be a reference for any other similar electrical control designs for mining. |
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