Atlas Copco MEYCO Cobra concrete spraying mobile goes into operation at Gujiatai iron mine
To improve shotcrete supporting efficiency and mining environment, a unit of Cobra-a concrete spraying mobile was introduced to Gujiatai iron mine in September 2014 which is Atlas Copco MEYCO’s first unit in Chinese underground mine, and positive results were achieved.
A well-equipped modern mine
As of June 2015, a number of Atlas Copco machines have been in operation at the Gujiatai iron mine, including Boomer 281 drilling rig, Boltec 235 bolting rig, EST 3.5 electric loader, Diemac U6 core drilling rig, Mixtec UV2 concrete mixer truck and MEYCO Cobra concrete spraying mobile. All of these modern machines help to build a solid foundation for the rapid development of Gujiatai iron mine.
Equipment of high performance has significantly improved productivity
According ZHANG Yong, Production Technical Supervisor of Gujiatai iron mine, Cobra has been working at an output of 6-8 m3/hour (the maximum output is 20 m3/hour), which is in line with the current shotcrete requirement at the Gujiatai mine, and the spraying output may be further increased to meet changing requirements. At present, the Cobra sprays two tanks of shotcrete per shift with each tank capacity of 3.5 m3, which takes approximately 40 minutes to complete. The thickness of each layer or spray is 3-5 cm (typically two layers are sprayed, i.e. first and second layers). During each spray, Cobra is repositioned after 2-3 m advance. The average rebound rate of sidewall and roof is approximately 10%. Operators clean the equipment completely after every spray session.
Jian Song, one of the operators of Cobra, highly praised the machine: “Compared with the dry-spraying machines we used before, this wet mix concrete sprayingequipmentgreatly improved the working environment, and the working efficiency of each shift is almost 5 times of the dry-spraying machine. This wet mix concrete spraying machines has a lower rebound rate, and with the feature of intelligent operation, the machines is quite easier to access for the operators.”
High-quality products winning customer’s trust
Looking into the future,, Laiwu Mining Co. Ltd. will still follow the pollution-free mining approach, and pay more attention to the health of its workers while enhancing productivity and working environment as well as reducing labor intensiveness by introducing advanced automation equipment, and to make contribution to the sustainable development of the mining industry.
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Atlas Copco’s Mining and Rock Excavation Technique business area provides equipment for drilling and rock excavation, a complete range of related consumables and service through a global network. The business area innovates for sustainable productivity in surface and underground mining, infrastructure, civil works, well drilling and geotechnical applications. Principal product development and manufacturing units are located in Sweden, the United States, Canada, China and India.
Underground Rock Excavation is a division within Atlas Copco’s Mining and Rock Excavation Technique business area. It develops, manufactures, and markets a wide range of tunneling and mining equipment for various underground applications worldwide. Atlas Copco's strong focus on innovative product design and aftermarket support systems gives added customer value. The divisional headquarters and main production center is in Örebro, Sweden.