Nghiên cứu này đã đưa ra giải pháp mới nhằm mục đích tăng chiều cao răng cắt và chiều rộng bước cắt mà không tăng tải trọng cục bộ trên răng cắt bằng cách kết hợp các răng cắt theo nhóm từ đó giúp giảm bụi, tăng cỡ hạt của than, giảm năng lượng riêng và tăng năng suất cắt của máy khấu than. | 10 Journal of Mining and Earth Sciences Vol. 64 Issue 5 2023 10 - 16 Improving the efficiency of the coal-cutting process by combining cutting teeth on the drum of the coal- cutting machine used in underground coal mining Linh Khac Nguyen Tien Van Pham Hanoi University of Mining and Geology Hanoi Vietnam ARTICLE INFO ABSTRACT Article history Nowadays coal mining is primarily carried out by underground method. Received 26th May 2023 The shearer is the main equipment used in underground coal mining in Revised 04th Sept. 2023 developed mining countries and it is gradually applied in underground Accepted 30th Sept. 2023 coal mines in Viet Nam. With coal-cutting machines using the cutting Keywords drum is applied mainly because of its simple structure high productivity Coal mining and reliability. However during the coal-cutting process the fine coal Cutting teeth content of about 40 50 of the total mining output causes dust generation as well as energy consumption because the coal is cut too Destruction small. According to previous studies this problem is solved by increasing Specific energy the thickness of the slices which is achieved by using larger drums with large cutting teeth and in combination with increased speed movement of the stage machine. This increases machine size large investment costs and reduces machine flexibility due to the tight space of mining areas. Through the research of previous authors it is possible to increase the cross-sectional area of the slices by forming slices in pairs and groups and at the same time enhance the failure by tensile stress instead of mostly compressive stress. In addition the overlap of stresses around the slice when using the coal-cutting teeth group also reduces the cutting force on the cutting teeth. In this study a new solution is proposed to increase the height of the cutting teeth and the width of the cutting step without increasing the local load acting on the cutting teeth by combining the cutting teeth in .
