Miners can straighten coal

The coal mining face, which is not high enough in height, cannot stand up straight to the coal miners, but has to bend over and hold a shovel, a shovel and a coal shovel to transport the coal shovel to the coal sluice. This production scenario has long appeared in Shandong Energy Zaoji Mine. Yuantangjing, Group Chaili Coal Mine. Due to the unfavorable factors such as complex geological structure, thin coal seam and long transportation lines, large-scale fully mechanized coal mining technology has been difficult to develop here. Today, through scientific and technological breakthroughs, Yuantangjing, a thin coal seam, has also used a fully mechanized mining equipment to allow coal miners to work straight. A few days ago, the reporter came to Yuantang Well in the Chaili Coal Mine and experienced the thin coal seam mining.

Yuantangjing is the subsidiary mine of Chaili Coal Mine. The original designed annual production capacity was only 210,000 tons. It has continued the artillery mining production process for more than 20 years. "The so-called shot mining is a process of loosening coal seams for mining by means of blasting during mining." One side goes down, Yuan Chengjing, a long section of Chenghai, told the reporter. During the blasting, the workers first shot a dense borehole on the work surface. Each shot was stuffed with explosives. The workers then retreated to a safe distance before blasting. After the blasted coal seam loosened and collapsed, the workers used iron shovels to shovel coal onto the belt. “A class of workers must shovel a dozen tons of light to shovel coal, and they all suffer from back pain after work.” Duan Chenghai recalls, “Not to mention that the mine has a thin seam of 1.3 meters at the lowest, more than a dozen jobs. Workers can only mingle halfway to coal mining, and the conditions are extremely difficult."

The upper fully-mechanized mining equipment has always been the Yuantangjing miner’s dream, but the realization of this dream has been difficult. Fully mechanized coal mining equipment is more suitable for reclamation, while the Yuantang wells adopt coal mining methods that are commonly used in old coal mines: digging forward. At the same time, Yuantangjing is a thin coal seam mine and its average coal seam thickness is only 1.6 meters, which is uneven in thickness and tends to be uneven. Under such conditions, the use of fully mechanized coal mining requires high equipment and technical requirements. Therefore, Yuantangjing has not been able to use it for a long time. Achieve underground well-mechanized mining. With the continuous decline of the domestic coal situation in the recent period, the thin coal seams abandoned due to poor conditions in the past have also been necessary for mining. The upgrading of mine equipment and advances in the technical skills of operators have finally made this dream a reality. In March this year, for the first time, the mine carried out comprehensive mining test at the underground working face and achieved good results of 1,721 tons per day and more than 40,000 tons per month, a new high since the well was built.

Wearing overalls, helmets, insulated rubber boots, self-rescuer, miner's lamp, and dust masks, we arrived at the first fully-mechanized mining face of Yuantangjing, which is more than 700 meters from the wellhead - 3 under 900. Work surface. Compared to the thick coal seam working face with superior geological conditions and a height of three or four meters, which is as spacious as an underground hall, the recoverable area of ​​the 3rd and 900th working face is still limited: the area is tunnel-shaped and is about 100 meters long. It is close to the front coal seam. The "big guy" is the shearer. The 67 hydraulic supports used for support were removed, and the width of the work surface was only about 2 meters, allowing only two people to pass in parallel. About 1.7 meters high from the ground to the top, taller workers need to bow downhole. “The workers are not required to bend over to produce coal. This height is very comfortable.” On-shift squad leader Xuekai Ke told reporters.

The shearer at the top of the tunnel made a huge roar. The two drivers sat on the coal-fired machine and “harvested coal”. The sharp wedges of the 1.3-m-long, 9-m-long helical machine head of the coal machine swiveled deep into the coal seam. The coal machine leans against the drill bit to catch the newly-expanded coal and quickly transports it to the transport belt that connects the wellheads. Only two cleanup workers on the side of the rake clean the small amount of coal that has fallen to the sleet. Sprinkling and dust-falling equipment continuously sprays water mist so that even if the sweeping operation is performed, there is no feeling of coal dust flying, but it is more humid than the ground.

Once the drill bit enters and exits, it can “harvesting” 200 tons of coal. A class can extract about 600 tons of coal in 8 hours, and this can be achieved only by the machine operator pressing the machine switch. The use of mechanization has enabled Yuantang’s underground workers to reduce the number of workers by more than 30, and the working environment of workers has also been significantly improved. "The bit can go into the coal mining, and the day when the miner's monkey shovels coal to shovel coal is gone." Xue Kaike said proudly.

Copyright Statement: This article is reproduced from online media and represents only the author's opinion. It has nothing to do with this site. If news articles and comments infringe your legal rights, please call us and we will handle it in a timely manner.