Practice on prevention and control technology of coal passageblockage in scraper transportation system

In order to improve the production efficiency of coal mining, maximize the potential production capacity of the working face conveyor, and improve the rationality of the supporting equipment of the working face, the transportation efficiency of the scraper transportation system was taken the overall improvement as the background and adopts similar products at home and abroad.The comparison of scraper chain speed, combined with the successful application of frequency conversion speed regulation technology in the scraper transportation system, systematically explained the feasibility of increasing the scraper chain speed.In view of the increased impact of high-speed coal flow on the “inflection points” of the scraper transportation system after the speed of the scraper chain is increased, combined with the harm caused by the large coal to the scraper transportation system in the current medium and thick coal seam mining. On the basis of summarizing the law of blockage of coal transportation channels, the positions that are prone to blockage in the scraper transportation system are divided into transition section, unloading port, feeding port, and climbing section.Based on the running state of bulk coalin the scraper transportation channel, the “advanced stepwise elevating and large arc transition”, “drum-type direct drive crushing”,“plow coal slab leading active plate” and “four-bar hydraulic impact crushing”and “contour side plate chain channel receding groove”were proposed. Other related coal flow channel blockage prevention and control technologies and solutions have been applied in the scraper transportation equipment of 117 working faces of the Jinjitan Coal Mine of Shaanxi Future Energy.The field industrial test shows that the bulk coal is effectively crushed before entering the nose frame, the amount of coal returned to the lower chain has been significantly reduced, and the service life of the middle bottom plate and the wing plate of the grooves and grooves of the transfer machine have been improved, and the coal flow is more smoothly transported in the scraper transport channel. The scraper conveying system using the above technical scheme ensures the smooth and continuous high speed transportation of coal and at the same timeit provides technical support for the overall improvement of the chain speed of the domestic scraper conveying system.