According to the characteristics of two kinds of skeleton model， through the publish geometry and copy geometry, the static skeleton model can be changed into motion skeleton model, which can define the shape of each component part of support , optimize the support mechanism and motion simulation. By using the related parameters measured directly in Pro/E, inputing the calculation formula in the dialog box, main mechanics can be calculated. Application shows that, the top-down method which using skeleton model meets requirements and represents the design direction in the future.

In shoushan mine, many problems that exist in the use of hydraulic winch mine effect coal mine normal production,but along with the use of frequency conversion winch, the failure rate of winch sudden drop and the apply obtains good results.furthermore these application of frequency-converting technique in some equipments such as compressor、partial fan has bring about the goal of high-yield、high-efficient、low-energy、low-cost in coal mine.

Aiming at the problems of EBZ-160 type roadheader load drive existing in downhole applications, putting forward a new way of using domestic hydraulic motor to replace imported motor in the roadheader. And through the schemes of equipment selection, transformation of hydraulic system, supporting facilities renovation in field test, achieved good economic benefits, and provided new methods to solve the related equipment failures and equipment update, etc.

Thesis studied the roadheader’s driven sprocket wheel surface wear failure. It introduced the basic structure and the failure phenomenon of the driven sprocket wheel. It analyzed the reasons of the driven sprocket wheel surface wear failure and the breakage. The paper considering from three aspects of the design, technology and applications to improve the design of the driven sprocket wheel respectively. Given the two driven sprocket wheel structure after improved, it improved the service life of the driven sprocket wheel.

The paper introduces belt conveyor for mine, and expounds the importance of smoke sensor for mine fire prevention. Then this paper focuses on the ionic smoke transducer, mainly concerns its operating principle, structure and signal processing system, etc. This kind of smoke transducer is suitable for applying to the early-stage prediction of mine fire with its high sensitivity and stability.

In view of the coal mine underground explosion-proof diesel engine in use in the process of crankshaft fracture phenomenon, the use of dynamic simulation software AVL Excite established the explosion-proof diesel engine crankshaft system multi-body dynamics simulation model ,and several working cycle of crankshaft dynamic stress analysis, The results show that the maximum of the sixth crank stress values of explosion-proof diesel engine close to the limit, operation in overload conditions is easier to be broken, and the results of conformity, the theoretical basis is provided in order to solve the fracture and optimize the crankshaft.

The hydraulic support mechanized mining equipment,In this paper, for the vibration and noise generated in the process of hydraulic support column,The combined analysis of the dynamic characteristics of the hydraulic support column, use power bond graph method to establish the mathematical model of the system, combined with MATLAB dynamic simulation tool Simulink software package for dynamic simulation of hydraulic systems. Resulting greater impact factors of dynamic characteristics, further raised the improved method. Provides a theoretical basis for the analysis and design optimization of hydraulic support system performance.

The damage results of the wenchuan earthquake in 2008 and the yushu earthquake in 2010 show that the staircase in frame structure has been destroyed seriously, which jammed the withdraw way .The paper, based on the findings of actual earthquake damage survey of the staircase in frame structure, analyzed the mechanism of stair damage in the previous earthquake ,the damage occurs mainly in stairway flight, frame column, stair column, stair beam and platform plate and then indicated the necessity of seismic design for stairs. By analyzing of the current code and combining recent years research, proposed several design suggestions which will help to improve the seismic behavior.

To master the mine real-time production environment state, manage conveniently the mine safety, avoid mine accidents, so implement the mine safety monitoring system based on android platform. Firstly, gives the three-layer system structure, including the application layer aground, data control layer aground and the underground ZigBee wireless sensor network layer. Then, introduce the business request of the android client, include the six function model. Give the three-layer software design, such as senor node software design, service interface software design and the android client software design. Finally, gives the implementation of the android client. The test shows that the system has high stability and accuracy, and can better monitor real-timely the safety state of the mine production.

According to the problem of coal mine safety warning and the shortcomings in traditional Fuzzy Neural Network (FNN), the coal mine safety warning model based on improved FNN is constructed. Application results show that this model has the advantages of good performance and high prediction accuracy. The coal mine security conditions can be predicted by establishing the appropriate warning models for different mechanized mining faces. In order to take the appropriate preventive and protective measures and avoid the occurrence of major accidents, dynamic regularity in the production process should be grasped timely.

Water supply wells for Daliu coal mine centralized control the issue，This article proposed that established the water supply well centralized control system, To achieve real-time monitoring and control of the operational status of each water wells，The sub-station will be collected electrical parameters，flow，level and other parameters sent to the monitoring center base on GPRS ne.．This program has alow cost，easy to achieve，transmission distance，etc．，have a strong practical．

Water resource storage by goaf is rarity in arid water shortage mining area, but it had not yet understudied. Therefore water balance method was applied in water resource transformation in Coal Area. Water storage conditions by goaf were analyzed by hydrogeololgical analogy method and pumping tests，and conditions were divided into four types. Based on hydrogeololgical parameters division of goaf, water storage by goaf time sequence model was established. The results show that the key of mining area water system to positive balance is water storage by goaf. The beneficial wate storageconditions are order of sand-clay-bedrock, bedrock-gully, clay-bedrock and drained boundary. Based on the time sequence model of water storage by goaf, water resources storage by goaf are 21.38 million m3 in Shennan Mining Area by the end of 2015. The research results will be helpful for water resources developing fully in arid water shortage Mining Area.

The anchoring characteristics of anchoring section of resin bolt in the coal mines are the key of bolt support design. The interaction relationship of bolt, resin and surrounding rock and the stress and the displacement distribution law are simulated and studied by the finite difference program FLAC3D, and also the variation of anchorage characteristics of anchoring section from elastic state to plastic state under the different loads. The result indicates that the axial force of anchoring section is negative exponential distribution along bolt axial direction, and also the shear stress of resin and rounding rock are negative exponential distribution along bolt axial direction. Finally the research results are applied to practice under mine well with monitoring force condition of bolts , and the results verify the correctness of the study conclusions.

This paper analyzed and stated the necessity of the gas drainage and control for NO 18201 coal mining face in Baolunyuan mine. Combined with its coal mining technology,certain conditions and Roof type of coal mining face ,Analysis to determine the parameters of high drilling. Practice for application in NO 18201 coal mining face in Baolunyuan mine,The results showed that:After using high drilling for gas drainage the amount of gas drainage is 1.75 ~ 3.39m 3 / min after the use of this technology.The amount of ventilation air methane is 1.46～2.224 m3/min,The Quantity of Air Current declined from 1030 m3/min in march to 790m3/min in July.The average amount of gas drainage is 2.09 m3/min. The average amount of gas consistence is 13.8 m3/min,The average amount of gas drainage ratio reaches 50.6% , gas consistence at the upper corners declined from 1.35% in march to 0.53% in July,To solve the problem of gas transfinite in upper corner.

Abstract: With the assistance of the vector software for the characteristic curve figure of axial flow fan and based on the study of the gathering principle and the curve figure’s characteristics, this paper finds out: 1) the number of collection point can be controlled under six, or even three；2）except for the key points, the position of collection points should be on the turning point of the curve for better effect; 3）to meet the digitalization of most collection, the highest power of the fitting equation needs to be no higher than two.

Abstract: A new topology of isolated three-level half-bridge bidirectional DC/DC converter is used. Ease of realizing soft-switching control, enabling bidirectional power flow, galvanic isolation, high reliability and having complete symmetry of configuration and so on, which are the common advantages of bidirectional DC/DC converter. Comparing to the two-level bidirectional DC/DC converter, the three-level half-bridge bidirectional DC/DC converter used in this paper can be more useful in high voltage application, because of the apparently decreased in switch stress. In this paper, detailed circuit analysis is made. Simulation results go with our conclusion which indicates the correctness of my research.

This article based on measurement and theoretical calculations, analyzed the of Tangkou coal ice refrigeration system cold loss, provided the basic datas to take corresponding measures to improve the utilization of the system cold.

Abstract ：Indicators of the single index of coal and gas outburst dangerous level has its own applicable scope and limitation, index evaluation results of different is not consistent. The assembled entropy anomaly area influenced by variety of abnormal joint control. Through the Kaiping syncline southeast wing coal bed combination entropy zoning map, to illustrate the application of geological combination entropy in Kaiping syncline southeast wing of the mine, which provides reference for the related gas geological work.

In order to study the transformation and lateral Force in Silo Unloading, this paper simulate a silo unloading flow condition and the stress condition of the wall and the material pressure dis- tribution inside in this condition by the way of discrete element. The result shows that in the con- dition of silo unloading ,the wall dynamic horizontal side pressure is increased than the static. W- ith the particle outflow, the dynamic horizontal pressure of the wall is fluctuating up and down

Abstract： experimental through deploying extremely low concentrations methane whose concentration are 0.75% to imitate coal mine ventilation air methane. Making the 0.75% concentration of methane through high temperature furnace, and collect the exclude gases of furnace. Then to detect the collected gas and confirm the conditions and characteristics of coal mine ventilation air methane.The study show； when The same concentration of VAM different flow rates through the high temperature furnace，Its flow rate is greater the higher the furnace temperature needed for complete oxidation；Flow rate the smaller the lower the temperature of oxidation required；

In order to study coal slurry flow characteristics in different channels, the application of the Euler Model of computational fluid dynamics (CFD) software carries on the numerical simulation for coal-water slurry flow in horizontal pipe and flexural pipe. It simulation analysis that, the coal water slurry at a stated speed, at a stated volume fraction as well as four kinds of coal grain diameter, the volume fraction distribution along the pipe section of the coal grain by respectively through the horizontal pipe, 90 ° and 150 °flexural pipe. The results show that, when the velocity of flow of coal slurry is 1.7m/s , the volume fraction is 45% and coal grain diameter is 0.5mm, in the horizontal pipe and flexural all appear obvious phase separation phenomenon, but when the coal grain diameter less than 0.25mm, in a horizontal pipe and flexural without appear phase separation phenomenon ultimately, it can completely satisfy the academic request of the coal transportation by pipe; for the same grain diameter of slurry, the fluidity in the straight pipe will be better.

Applying electromagnetic integration technology in heterogeneity VRM could improve the response speed of VRM, proposing to use many vice core unified integrated multiphase coupling array type integrated magnetic structure in this paper, taking the four-phase non-isolation interleaved VRM’s four-phase coupling array type integrated magnetic structure for example to analysis. Analyzed the relationship between VRM reduce the steady state ripple as well as enhance the dynamic response with the integrated magnetic coupling degree. Analyzed and simulation verified the influence of coupling magnetic core’s yoke resistance to integrated magnetic parameters, comparing to the influence of integrated magnetic parameters asymmetry to VRM’s performance. Giving the design method of integrated magnetic, through prototype experimental demonstrate the validity of the theoretical analysis and simulation result.

This paper studied acrylate grouting material used in micro-fissure water plugging, and their basic properties were studied. The experimental results showed that the slurry viscosity was below 3×10-3Pa ? s. The gel time of slurry, shortened and reduced gap between the two systems with the increase of the main agent concentration, and lengthened in A-Ca reaction system. The ratio at about 1, gel time was longest. The gel time was controlled in 3min-15min. The uniaxial compressive strength of the material was below 1MPa. Research results had been used for surface pre grouting of water plugging in 1000m deep shaft.

In order to solve the problem of Shendong mining 1.7m seam continuous mining machine tunneling half coal rock Lane applicability and efficiency issues，a measuring and analysis was conducted on the roadway excavation behaviors of the Shigetai Mine No.2-2 Up seam.The results showed that the day footage with the lower seam thickness decreases，both can be fit to a 4 times polynomial，Using continuous mining machine digging Mine No.2-2 Up seam average monthly coal roadway drilling footage on 900m above，meet the need for rapid excavation，quickly moving、extending contacted Lane center distance and ensuring the quality of equipment maintenance and other measures can improve the driving efficiency .

Through adding modifiers and active substances into the raw materials, developed environmental-friendly two-component chemical grouting material with less volatile organic compounds and high early strength. The material could solidify within 60 seconds after two-component mixed. The compressive strength, shear strength and adhesive strength of the 4-hour solidification were more than 36mPa and 18mPa and 2.6mPa respectively. Owing to broken and falling roof of the open-off cut in a coal mine, adopted the two-component grouting material to reinforce the roadway. Results showed that, the grouting evidently improved strength and integrity of the broken roof, and effectively controlled roof falling and rib spalling and increased excavation velocity，assured safety and high efficiency mining.

Abstract: This paper utilized engineering cases, loading tests, in-situ tests and settlement observation to verify results of recently accumulated Deep Earth-filled Ground treated by high energy level dynamic compaction. It will provide in-situ measurement data for the definition of the effective reinforcement depth of high energy level dynamic compaction, enhancement of foundation bearing capacity and construction technology.

In datong yungang mine mining height over geological structure and local change support problem, through the forecast flush with directions, and the analysis of rock pressure support damage effects, compared the arrangement "hilt" transport along the tank after wash with a big move change support plan, and "spindle move cut lane" directly into the move change support plan, and the cutting roadway bolt + anchor beam + anchor group + net + monomer column joint support, large section change support technology and working face and cut lane through before and after the ventilation system safety technology have been discussed in detail. Practice shows that the spindle move cut lane "directly into the move replacement of the damaged support technology short construction period, driving less quantity, saving the supporting materials and avoid the loss of coal pillar, the roof, ventilation, electrical and mechanical equipment operation, construction technology to realize the safe and effective control.

Based on the characteristics of abnormal strata behaviours of 42103 first fully mechanized caving face during the initial mining period in Bu'ertai Coal Mine, this paper analyses the causes of abnormal pressure and sums up some comprehensive measures of controlling pressure anomalies, including lowering the top coal release speed, using the pump regulator, improving rated working resistance of stents and ensuring reasonable working-bit mode, etc., which have achieved good results.

Abstract: The trouble of scraper conveyor moving up and down often occurs in fully mechanized mining face. This paper considers that the major reason is imbalanced stress of scraper conveyor, when the join force is upward, the scraper conveyor moves up. The main method of controlling scraper conveyor is false inclination mining, practicing in the 1412（3）working face and the effect is remarkable.

Abstract: Taken Fangshan 35kV transformer substation accident for example, the paper analyzes firstly single-phase ground fault of non-grounded neutral system because of rainfall and the decrease of cable head dielectric strength, and further analyzes that the accident spread is closely related to the power grid operation mode, excessive capacitive current and intermittent arc grounding over-voltage. Then some measures to limit similar accidents are proposed and some suggestions are given finally.

“Prevention” is mine as guidelines struggle with various natural disasters, but also to prevent must follow the principle of coal spontaneous combustion.According to the characteristics of the main mining coal seam in Yanzhou mining area, analyzed the characteristics and rules of Yanzhou mining area total working face natural ignition, comprehensive fire prevention and extinguishing technology system suitable for the establishment of Yanzhou fully mechanized top coal caving mining face, has a strong reference for prevention of spontaneous combustion in fully mechanized caving faces.

Abstract: In actual production occasions, the movable sieve jig sometimes fails to provide a sufficient processing capacity. This paper analyzes the causes of the problem and presents some solutions. With the solutions implemented, the processing capacity of the movable sieve jig has been greatly improved, and this helps to bring about a more balanced mine production capacity by enhancing the system’s operating reliability, reducing its down time caused by failures and raising its processing efficiency. Thus, this paper can be of some reference value for production projects with movable sieve jigs operating on site.