Design of hydraulic coal unloading device of belt conveyor in underground coal mine
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摘要: 以纳林庙煤矿二号井6-2116综采工作面为工程背景，针对回收煤柱工作面充填空巷用煤量大且运煤困难的问题，设计了一种煤矿井下带式输送机液压卸煤装置。该装置由支撑装置、改向装置和液压系统组成，安装在主运巷道与辅回撤通道交叉口位置；利用液压泵站为动力，通过支撑装置和改向装置相互配合将煤炭从带式输送机上卸下，再经转载运输至用煤空巷。通过该卸煤装置，原煤不需要升井后再用无轨胶轮车运输到井下，提高了经济效益和充填效率，降低了安全风险。现场工业性试验结果表明，采煤机割煤速度为0.8 m/min、刮板输送机速度为0.4 m/s、转载机速度等级为低速、带式输送机速度为1.0 m/s、改向油缸和支撑油缸伸出长度为0.7 m时，卸煤装置可实现连续卸煤，满足试验工作面充填用煤需要，保证了回收煤柱工作面的正常推进。Abstract: Taking the 6-2116 fully mechanized coal mining face of No.2 shaft of Nalinmiao Coal Mine as the engineering background, in view of problems of large coal consumption and difficult coal transport in abandoned roadway backfilling on coal pillar recovery working faces, a hydraulic coal unloading device of belt conveyor in underground coal mine was designed. The device is composed of support device, redirection device and hydraulic system. It is installed at intersection of main transportation roadway and auxiliary retracement channel. Using hydraulic pump station as power, the coal is unloaded from the belt conveyor by the support device and the redirection device cooperatively,and then the coal is transported to the abandoned roadway. Through the coal unloading device, the raw coal does not need to be lifted into ground and then transported to underground by trackless rubber truck, which improves economic benefit and filling efficiency, and reduces safety risk. Field industrial test results show that when the shearing speed of shearer is 0.8 m/min, the speed of scraper conveyor is 0.4 m/s, the speed level of transfer machine is low, the speed of belt conveyor is 1.0 m/s, and the extension length of support cylinder and redirecting cylinder is 0.7 m, the coal unloading device can realize continuous coal unloading, which meets needs of coal backfilling for the test working face and ensures normal advancement of the coal pillar recovery working face.
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