Time filter

Source Type

Mao J.,LIAONING Technical University | Zhang Y.,LIAONING Technical University | Liu Z.-S.,China National Coal Mining Equipment Co. | Li G.-P.,China Coal Zhangjiakou Coal Mining Machinery Co. | And 2 more authors.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2015

Horizontal clearance and vertical one between plough head and sliding framework were considered. The criterion of contact-impact between plough head and sliding framework were established with the collision detection method using the distance between a point and a line. The plough head's dynamic equation with 3-DOF vibro-impact under clearance conditions was established by using a nonlinear spring-damper contact force model. The numerical simulation was performed by using Runge-Kutta method. The results showed that there are single-point impact, two-point impact and three-point impact between plough head and sliding framework under clearance conditions; the maximum collision force at each contact point between plough head and sliding framework firstly increases and then decreases with increase in vertical clearance, and increases with increase in horizontal clearance. The plough head's dynamic model was adopted for simulation with RecurDyn. The results agreed well with those of the theoretical analysis. ©, 2015, Chinese Vibration Engineering Society. All right reserved.


Zhang Q.,LIAONING Technical University | Zhang Q.,State Key Laboratory of Structural Analysis for Industrial Equipment | Zhang Q.,China National Coal Mining Equipment Co. | Wang H.,LIAONING Technical University
Disaster Advances | Year: 2012

Mine mechanical system is a technology complex, it has widely distributed equipment and then there are inspection management difficulties. The system adopts advanced gigabit loop ethernet communication technology, uses Siemens programmable controller PLC and PC configuration software as the developing platform, collects the testing parameters of the compressors through the field detecting element, analysis and real-time feedback. Use remote monitoring and early-warning system and SQL Server database system CLIPS expert system tool to establish the corresponding fault diagnosis rules. The results showed that Mining Machinery early warning system remote monitoring and fault diagnosis technology is feasible and it is effective to reduce the failure rate of the air compressor system and it ensures safety in coal mines.


Zhang Q.,LIAONING Technical University | Zhang Q.,Dalian University of Technology | Zhang Q.,Sichuan University of Science & Engineering | Wang H.,LIAONING Technical University | And 4 more authors.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2016

Aiming at the low accuracy and reliability problems when using single signals to recognize the coal-rock interface for controlling and adjusting the height of shearer roller, a multi-sensor information fusion coal-rock recognition method was put forward based on fuzzy neural network. The sample characteristics of vibration, current and sound power spectrum signals were obtained through the acquisition and analyses of experimental data during cutting the section with different proportions of coal-rock, and the coal-rock recognition signals' fuzzy membership function was found according to the minimum fuzzy optimization model. The controlled measurement of roller's height with highly reliability and accuracy was obtained through multi-dimensional fuzzy neural network, which was built by adaptive neuro-fuzzy inference system. Laboratory cutting experiments and the scene cutting experiments of random coal-rock trajectory were carried out, the results show that the cutting trajectory of shearer's roller is basically the same as the random trajectory of coal-rock specimen, the results confirm the effectiveness and reliability of the system. © 2016, CHINA MECHANICAL ENGINEERING Magazine Office. All right reserved.


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.


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.


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.


Zhang Q.,LIAONING Technical University | Zhang Q.,Dalian University of Technology | Zhang Q.,China national coal mining equipment co. | Li S.,Dalian University of Technology
Advanced Materials Research | Year: 2012

In order to study strength characteristics of pick when cutting different hardness of rock,according to current situation that actual external load can not be obtained easily and load characteristics can not be grasped correctly, establishing flexible entity model of pick based on LS-DYNA,building constitutive model of rock based on SPH theory.Making simulation for the progress of cutting three different hardness (sturdiness coefficient f)of rock to get stress changes and statistical data of carbide cutter head of pick.The results of simulation show: the body of carbide-tipped teeth were severe stress concentration, while 8


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.


Zhang Q.,LIAONING Technical University | Zhang Q.,Dalian University of Technology | Zhang Q.,China National Coal Mining Equipment Co Ltd | 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.


Zhang Q.,LIAONING Technical University | Zhang Q.,Dalian University of Technology | Wang H.,LIAONING Technical University | Mao J.,LIAONING Technical University | Liu Z.,China National Coal Mining Equipment Co.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2015

According to the coupling relationship between the mechanical system and control system of scraper conveyor, the nonlinear state space electromechanical coupling equations were derived for scraper conveyor, the simulation model of the scraper conveyor was established by using MATLAB/Simulink module, the electromechanical coupling dynamics of the scraper conveyor system was studied, the equivalent load change of mass was used to analyse the scraper conveyor's scraper chain speed and electromagnetic torque characteristic curves in no-load start, stable operation, load surge and card chain condition. Two sprockets' angle curves were obtained at startup, the results show that, the start angle difference between drive sprocket and the driven sprocket is about 85°, the driven sprocket lag about 0.8 s than that of drive sprocket when it rotates. It is provided the theoretical and numerical basis for studying scraper conveyor's torque, speed change and calculation of sprocket's pretension in different working conditions and loads. © 2015, CHINA MECHANICAL ENGINEERING Magazine Office. All right reserved.

Loading China National Coal Mining Equipment Co. collaborators
Loading China National Coal Mining Equipment Co. collaborators