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Zhang J.-H.,Shenhua Shendong Coal Group Corporation Ltd
Meitan Xuebao/Journal of the China Coal Society | Year: 2012

The O-ring floating seal structure design, friction mechanism and characteristics compared with the packing seal were introduced. Briefly introduced occasions in the floating seal applications, involving the determination of parameters of face seal, seal ring and O-ring material selection, manufacturing and installation techniques, and introduced floating in applications such as drum shearer O-ring sealed solid and shuttle cars walking gear gearbox output shaft for the floating seal packing seal transformation effect.

Yang J.-Z.,Shenhua Shendong Coal Group Corporation Ltd
Meitan Xuebao/Journal of the China Coal Society | Year: 2012

The vibrating screen of Schenck SLO2496 banana type was researched, and the concrete data of dimension could be obtained through the field measurement. The three-dimensional model was established based on maintenance manual combined with the concrete data. Then it was transmitted into Workbench software, in which vibration modal analysis was completed. Meanwhile, the whole vibrating system was simplified as a single freedom vibration system by theoretical analysis, and then obtained the system natural frequency. Followed by the vibrating screen hammer test for experimental modal results, and finally compared with the finite element results to validate their reasonable. From the analysis result, the various order natural frequency and vibration mode are obtained. The vibration performance is obtained, which provide an essential theoretical basis for the optimization design. It allowed the excitation frequency as far as possible away from the resonance frequency range, and allowed the shaker resonate between the various components in use process, and improve the service life of the vibrating screen. Meanwhile, the analysis results can be used as essential theory basis for further dynamic analysis.

Zhang J.-H.,Shenhua Shendong Coal Group Corporation Ltd
Meitan Xuebao/Journal of the China Coal Society | Year: 2011

In the process of mining equipment maintenance modernization, high-quality, efficient, energy-saving, material saving, environmental protection as criterion, combining parts wear, damage types and technical requirements, using laser cladding, arc spraying, brush plating, surfacing, metal surface strengthening surface engineering technology studied structure and transmission components remanufacturing. Through practice summarized the process principle of applicability, and put forward the corresponding repair plan.

Yang R.M.,Shenhua Shendong Coal Group Corporation Ltd
Advanced Materials Research | Year: 2013

In recent years, there are a lot of safety accidents in China's coal mine, it causing heavy casualties and huge economic losses, so the coal mine production safety situation is very grim. In order to improve this situation, we research and design a set of coal mine safety monitoring system. Its underlying uses a technology which is ZigBee, it is short-range, low-speed wireless networks, and it connecting the coal mine of numerous sensor and video surveillance systems. Monitoring interface uses a Web way constitute a complete set of coal mine safety monitoring system in order to be able to burst in coal mine disasters in a full range of monitoring, and to avoid the occurrence of safety accidents. In this paper, the overall coal mine safety monitoring system theory and specific design. © (2013) Trans Tech Publications, Switzerland.

Hu Z.-Q.,China University of Mining and Technology | Wang X.-J.,China University of Mining and Technology | He A.-M.,Shenhua Shendong Coal Group Corporation Ltd
Meitan Xuebao/Journal of the China Coal Society | Year: 2014

Coal mining might cause serious environmental damage in ecologically fragile region. In sandy and windy region, ground fissure is the most typical characteristic of ecological damages caused by underground coal mining. However, few works and reports are related to the generation and whole development process of ground fissures caused by high tension and rapid caving mining. Through the united space coordinates control system at surface-underground, a comprehensive observation method was invented to monitor ground fissure on the No. 12406 working face of Bulianta coalfield, distribution characteristic of marginal fissures, genesis and development rules of dynamic fissures and their relationship with mining geological conditions were revealed. The results show that: (1) Dynamic fissures always develop ahead of the current working location, the crossover distance has a significant positive linear correlation with size of daily footage. The average fissure crossover distance is 10.359 m and advance angle of break is approach to vertical angle. (2) Under the high tension and rapid caving mining, dynamic ground fissures havn't obvious heads in vertical direction, those widths had similar cyclical changes during the mining process and present 'M' type with two different peaks. The first peak (maximum width) is 1.4-3.8 times of the second one. The life-cycle of a dynamic fissure is 18 days, including two cracking-closure processes with similar duration. On this basis, a common function model for the life-cycle was established based on mining and geological conditions. It indicates that dynamic fissures have fast 'self-healing' features and manual repairmen might not be necessary. (3) Marginal fissures occurrs in strips and the 'O' shape inside of boundary working face, and the width of strip of marginal fissures is about 46-50 m. If the adjacent coal face excavates, the width of the strip of marginal fissures in this side will be narrowed 40% due to the double disturbance. The distribution region of marginal fissures will exist long time and need manual restoration.

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