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Zhang Q.,LIAONING Technical University | Zhang Q.,Dalian University of Technology | Zhang Q.,China national coal mining equipment co. | Xu M.J.,LIAONING Technical University | Hu N.,LIAONING Technical University
Strength of Materials | Year: 2014

In order to study the fatigue life of plow bit under different planning parameters, the process of plow bit cutting coal seam is simulated based on a solid model. The variation of the stress in the joint between the blade and carbide head is obtained by simulating the planning process with different planning parameters of the weak joint (cutting angle, plow thickness and plow spacing). The fatigue life of the plow bit is predicted using the improved rain-flow method and the Miner linear accumulated fatigue damage model. According to the experiment on plow bit life, the stress amplitude and accumulated damage in one stroke are the least at the cutting angle of 80°, with the number of working strokes and working hours of a damaged plow bit reaching the maximum. The thicker the plow bit is, the larger is the resistance and higher is the damage. In addition, a smaller plow spacing implies a better planning ability and a smaller damage. The experimental data are consistent with the results of the theoretical analysis. © 2014 Springer Science+Business Media New York. Source


Zhang Q.,LIAONING Technical University | Zhang Q.,Dalian University of Technology | Zhang Q.,China national coal mining equipment co. | Fu Y.-F.,LIAONING Technical University
Meitan Xuebao/Journal of the China Coal Society | Year: 2013

By combining the reliability-based optimization design theory, the reliability sensitivity technique and the robust design method, the reliability-based robust design for the kinematic accuracy of the plow chain with arbitrary distribution parameters was discussed extensively. Subsequently, a numerical method for reliability-based robust design was proposed. Under the condition that the first four moments of basic random parameters are available, NSGA-II algorithm computer programs based on this model can be used to complete the reliability-based robust design for kinematic accuracy of plow chain accurately and quickly. Based on the proposed models, an example shows that the proposed method is practical and effective. Source


Zhang Q.,LIAONING Technical University | Zhang Q.,Dalian University of Technology | Zhang Q.,China national coal mining equipment co. | Nie G.-Q.,LIAONING Technical University | Li S.-J.,Dalian University of Technology
Meitan Xuebao/Journal of the China Coal Society | Year: 2013

Through the analysis of the motion and the stress of coal particles of the coal auger, the mathematical model of the confined transportation of the coal auger was established by using CFD software. The influence law of the pressure difference, medium rheological parameters, and geometrical structure parameters on the conveying efficiency was studied. The results indicate that the differential pressure between entry and exit determines the driving mode of coal particles; the conveying efficiency raises with the increase of the differential pressure between entry and exit; the differential pressure between entry and exit raises with the increase of the ratio between the pitch and the internal classic, and the torque decreases with the increase of the ratio between the pitch and the internal classic. Source


Jin P.,China University of Mining and Technology | Jin P.,China Coal Energy Company Ltd | Jin P.,China national coal mining equipment co. | Qiang L.,China University of Mining and Technology
Advance Journal of Food Science and Technology | Year: 2015

In view of the social phenomenon of people's generally low satisfaction with food safety, we introduced the QFD method to make evaluation and guidance for improvement. Based on scientific and reasonable evaluation index system of food safety satisfaction and the "quality house" of QFD core tool, a food safety satisfaction evaluation model was constructed. On the basis of the evaluation results, we analyzed the public food safety requirements and constructed the quality house between the public food safety requirements and the food safety satisfaction improvement measures, so as to determine the priority of configuration sequence of improvement measures. © Maxwell Scientific Organization, 2015. Source


Zhang Q.,LIAONING Technical University | Zhang Q.,Dalian University of Technology | Zhang Q.,China national coal mining equipment co. | Li S.-J.,Dalian University of Technology
Energy Education Science and Technology Part A: Energy Science and Research | Year: 2012

In order to analysis auger coal miner coal particle motion and stress, we need to establish auger coal miner pressure mathematical model by CFD software, the main purpose of mathematical model is to provide a transmission efficiency for discussing by differential pressure conveyors and medium rheological parameters and geometry parameters. The result shows that: the different pressure of import and export determined coal particles driven approach, transmission efficiency increases with pressure difference increasing; transmission efficiency increases with pitch divided by diameter increases, torque reduce with pitch divided by diameter increases. © Sila Science. All rights reserved. Source

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