| With the continuous development of the coal industry,the proportion of coal energy in the domestic disposable energy consumption is increasing,the coal economy plays an increasingly important role in the national economy,and the safety of coal energy mining is getting more and more attention.The safety production of coal mine not only affects the development of national economy,but also concerns the life safety of millions of coal mine workers.Therefore,the safety production of coal mine will deeply affect the development of the country and society.In our country,most of the industrial and mining coal mine are well,personnel,equipment and ore conveying by mine hoist,in addition to caving and gas accident,just a few of mine hoist running failure caused by accident,most also is most serious,thus the operation safety of the hoisting machine is one of the most important link in the safety production in coal mine.Because of the mine hoist in emergency braking,the hoisting rope flexible can produce vibration and impact on the ascension of the whole system,and with the development of coal mining,many large mine production,improve the growth process of increasing depth,improve load and speed increasing,it will lead to the impact and vibration caused by wire rope of flexible more severe,which in turn directly causing the appearance of the rope slipping phenomenon,and the damage to the lifting equipment to produce,and may cause serious safety accidents.At present,the research shows that the application of the constant deceleration braking system can well alleviate the impact and vibration generated during the hoisting process of the hoist,and ensure the safety of equipment and personnel in the hoisting process,which will have great significance for the safe mining of coal mine energy.The content of this paper mainly includes: firstly,the background,significance and research status of the subject are elaborated,and two foreign manufacturers of constant deceleration braking system,ABB of Switzerland and SIEMAG of Germany,are emphatically introduced,and their representative products are analyzed.In China,Luoyang Zhongxin heavy industry is taken as the representative.Meanwhile,it also expounds the shortcomings and shortcomings of domestic technology compared with foreign technology.Secondly,taking multi-rope friction lifting system as an example,this paper introduces the operation law of lifting container in wellbore,gives the derivation process of basic dynamic equation of mine lifting,the choice of deceleration mode and the calculation of deceleration speed in deceleration stage of lifting container,and finally expounds the working principle of constant deceleration braking.Moreover,the constant deceleration braking system important hardware part has carried on the research and analysis,put forward the core control system using DSP and PLC combination scheme,and put forward the innovative multi ring absolute photoelectric encoder as the speed of the hoist drum acquisition signal sensor,encoder and DSP communication scheme is given,and the PLC as the control core of the global control process,also choose the system USES oil pressure sensor,and carries on the calibration experiment.In addition,the electro-hydraulic proportional overflow valve,a hydraulic component which plays a decisive role in the accuracy of hydraulic pressure in the oil circuit of the constant deceleration braking system,is simulated.Finally,the simulation model from the input to the amplification voltage of the proportional amplifier to the speed reduction of the hoist drum is built,and the dynamic response characteristics of the model are analyzed to meet the requirements of the constant deceleration braking response performance.Figure[60] table[6] reference[56]... |
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