by Comprehensive technical and economic comparison of three design programs, determine pipe belt conveyor for ground conveying system of AnYang coal mine, propose application reason and pay attention questions in coal mine conveying system.

In order to resolve the contradiction of land use between coal mining enterprises and local residents,promote the coal mine underground mining and residential development，Through comprehensive analysis of coal mining and residential construction forms of conflict, causes, It is believed that this kind of contradiction is caused by the lack of scientific demonstration in the management of land and mineral resources, and the lack of project construction, to the administrative departments formulated relevant policies to provide the basic research data.

In order to solve the problem of rock burst and roadway large deformation controlling in thick coal seam with bump proneness of deep shaft， apply the control principle theory of gob-side entry driving in narrow coal pillar and stagger position roadway layout， Huafeng Coal Mine took the experimental study in 1411 air return roadway. By the deformation of roadway and microseismmic monitoring data， following result was obtained： stagger position roadway layout can solve the problem of the strong and frequent rock burst and roadway large deformation of 1411 air return roadway. It realized that the mine earthquake over 0.8 were reduced by 87%， the convergence between roof and floor was reduced 132.5mm and the deformation amount of two sides reduce 152mm. The test results have certain directive meaning on rock burst prevention and controlling.

The influence relation of dragline equipment conditions, casting blast effect and mining parameters to surface mine output were analyzed, calculation formula of surface mine output was derived, each factors impact on surface mine output were researched by adopting sensitivity analysis method. Research results shows that casting bench height, dragline steady availability and effective casting blast rate are the key influencing factors to surface mine output adopting casting blast- dragline stripping, in which the former two are the fundamental factors. In order to achieve output of 33Mt/a, dragline steady availability should be ensured more than 93.8% and casting bench height reduced to less than 38m.

Abstract: During the conveying process of large sized coals in big drop chute in a coal preparation plant, several problems are existed such as the heavier impact of chute caused by large sized coals, the higher broken rate of large sized coals, and the higher noise and coal dust . The five structures of big drop chute under head funnel of belt conveyor, which each are size of cross-section, angle of inclination, part of triangle turning, flowing baseplate and tail end part, were optimized well. The new optimized structures of those will leave lump coals flowed easily in chute, and the amount of large sized coals broken resulting from collision decreased evidently.

To guide wire rope as the research object, analyzing the constraint and force of guide rope, get the guide rope stiffness calculation formula. Studied the guide rope lateral stiffness and horizontal displacement along with the change of hoisting height, analysis of guide rope tension and guide rope unit length quality to guide the influence of the stiffness. The results show that the guide wire rope on both ends of the lateral stiffness is very big, the closer the guide rope middle position stiffness is smaller; Guide rope is inversely proportional to the lateral displacement and lateral stiffness, the greater the stiffness, the smaller displacement; Guide rope stiffness with the guide rope tension and guide rope and increases linearly with the increasing of weight per unit length. Reasonable selection guide rope tension, increase guide rope rigidity, to reduce the guide and promote container swing plays an important role.

The article introduces present situation of flotation concentrate dewatering system and the existing problems in the Fangezhuang Coal Washing Plant. Aiming at these problems, to reform the original system. This paper briefly introduces the technical transformation process plan and its advantages, and illustrates the main equipment selection and process layout. Expected application effect is remarkable affter technical transformation for the system, not only can effectively improve the flotation concentrate dewatering effect and reduce the water content of the product, but also can achieve the effective recovery of fine-grained flotation concentrate, improve clean coal recovery rate and create economic benefits.

[Abstract] In order to study the working principle of cement sand cushion, the optimum mix proportion of cement sand cushion is further understood in the physical properties of cement sand cushion and the design requirements. Based on the engineering example, this paper introduces the design features of cement sand cushion in large area. This paper introduces the experimental results, economic effects and performance analysis of composite foundation of cement sand cushion;

In order to ensure the equipments operation to be more reliable and stable, and promote the level of equipments maintenance and management in coal preparation plant, Equipment Inspection System was introduced to Changcun coal preparation plant. Using computer information technology, the data of equipments running status and the daily management of maintenance are integrated in a unified network information platform. According to the analysis results of equipment monitoring data and personnel work information, the system can timely give out early warning signals and solutions, and can also manage maintenance staffs and devices effectively.

At Songhe coal of the first mining area , for solve the coal bunker vertical height、the complexity coal and rock stratum construction、shorten the time limit for a project,by use the total station center finding、special support frame to steadiness drilling machine、drill PVC annular tubes、dynamite lead tunnelling、discharge waste rock and ventilate, improvement the construction technology,to prevent the coal rake and hole collapse, increase lead tunnelling powder charge and blasting effect, guarantee the construction quality, realize rapid construction, practice indicate,the dynamite lead tunnelling ues at complicated geological condition to solve the coal bunker vertical height is clear effect.

To reduce high geostress on surrounding rock of gob-side entry retaining in deep coal mining，weighing feature of gob-side entry retaining is analyzed base on key block of voussoir beam，So that we proposed the technology of presplitting blasting caving，including of deep hole pre-split blasting technology and strike small angle level drilling group roof cutting technology，cutting off the strike and dip direction of thick and hard roof in coal face，and the side of entry will formed under the action of periodic weightings, which can separate the goaf and support the overlying moving strata, and improve the surrounding rock stress environment，to achieve the goal of reducing broken length of working face roof and beam cantilevers of roof in goaf side.

1115 (1) working area of 740m, which is based on the bridge, is studied in the background, and the reasonable width of the filling body is studied by theoretical analysis, numerical simulation and in-situ measurement. The results show that when the composite roof lithology is soft, the large area of the roof can be broken down and the large amount of subsidence is large. Therefore, the roof should be strengthened to maintain its integrity. At the same time, when the width of the filling body is about 2.5m, the stress and displacement of surrounding rock are optimized, and the successful application of this method in the actual production, so that the maximum shrinkage rate of the roadway is about 28.5%. meet the production requirements, indicating that the method is reasonable, and it has certain guiding significance to the practice of the gob-side entry retaining.

Whit the further deep vertical shaft being excavated, the geological and mechanical conditions of vertical shaft become more complicated compared with those in shallow roadway.. The horizontal crustal stress is the main reason resulting in the surrounding rocks’ deformation and failure. Under the condition of different side pressure coefficient ? and horizontal stress ratio k, selecting the section shape of vertical shafts that have different axial ratio (b/a) to research the surrounding rock’s stress distribution and deformation features. The result shows that the equal stress axial ratio of deep vertical shaft surrounding rocks is different from that of deep buried elliptic roadway. The equal stress axial ratio of deep vertical shaft surrounding rocks is related to the horizontal stress ratio k. When side pressure coefficient and horizontal stress ratio are both constant, stress concentration areas of different shaft cross-section axial ratio mainly distribute in both ends of the x-axis of the shaft. The maximum deformation is in both ends of the y-axis. From the stress distribution and deformation analysis, under the same conditions, when using circular section to excavate the shaft, the disturbance of the surrounding rock affects the minimum. On the basis of analyzing shaft wall rock stress and deformation characteristics, the concept of shaft surrounding rocks double shell compound support was proposed, and its reinforcement mechanism was analyzed.

It is defined as laser scanner virtual volume-measuring system in the paper that to collect the spatial point clouds of a moving surface mining transport vehicles and to achieve accurate measurements of the exploitation of shipments with the application of laser scanning. There are time error, GNSS error and spatial point cloud measurement error in the system while in the process of acquisition and integration of spatial data, the existing measurement error model cannot accurately express the error propagation of the system. In the paper, an error propagation model is designed for the system, and it applies to the measuring system that has structural similarity to the virtual volume-measuring system. The paper discusses the factors affecting the measurement accuracy with examples, draw the error characteristics of different surface construct method, which has an instructional significance to the construction and application of similar systems.

Compared with different schemes of transfering the rail type electric tachometer indicator train between adjacent gateways in fully mechanized caving face ,we got the feasibile method of the train which passed the curved track.Through analyzing and industrial testing the key points of the project in coal,we got several important links.Then,we optimized the effect of train trasfering between adjacent gateways.The cost decreased and the coal exploitation rate increased.

Lutaishan coal limited company of shanxi coal import and export group is high gas emission well, all of poor permeability of coal seam, difficulty of gas emission and super close distance of upper and lower adjacent layers are main problems, which are the main factors cause disallowed gas concentration appears frequently in the process of underground mining, normal production is severely affected. Based on the analysis of the existing gas problems of Lutaishan coal mine, the main gas problems of the mine are analyzed and the main factors leading these problems are proposed at the same time. Combining with the engineering practice of gas control in the process of mine production, the control system of gas drainage and extraction is proposed according to the characteristics of coal seam occurrence. Engineering practice shows that drilling gas drainage technology of fool wearing lay cooperating with gas drainage technology of bedding and short hole can be used to solve gas control problem in seams with parting band, and the effect is quite remarkable.

Aiming to solve the problems of coal spontaneous combustion, CO content over limit occurred during the withdraw period of Zhang Shuang-lou coal mine 9427 working area, the geological structure of the coal mining face, coal quantity left, ventilation leakage and other aspects were analyzed. According to the actual conditions of coal mining face and features of each fire prevention technology, a comprehensive technology was applied including pressure balancing, grouting high-water materials through high level boreholes, injecting foam-gel in the boreholes drilled in front of the stents based on the principles of reducing leakage, isolating the oxygen, deleting high temperature areas quickly. The concentration of CO decreased from 1200ppm to 10ppm or less, and finally stabilized to the end of withdraw period.

Abstract: Rock burst is one of the most serious coal mine dynamic disaster, which restricts the efficiency of coal mine safety production. The effective prediction of rock burst risk is essential to prevent rock burst. Seismic computed tomography technology provides an efficient way to predict rock burst by inversing stress distribution in mining area. Taking rock burst prediction during the driving of No.9 coal seam auxiliary transport rise in south No.2 mining block of Sanheijian Mine as example, the high stress and high stress gradient area corresponding to the impact of the risk was obtained by seismic computed tomography technology to analyze of wave velocity distribution before driving. Driving process reflects the accuracy of prediction and specific risk relief measures was adopted to ensure the safety of the roadway driving. Seismic computed tomography technology is used to inverse velocity distribution in relief region again after driving. The results show that region velocity reduced, and the high stress and high stress gradient get eliminated in the area by taking pressure relief measurement, which means rock burst risk get controlled effectively.

The surrounding rock is often broken rock mass in underground engineering, but it still has certain bearing capacity subjected to rational supporting system. Accordingly, experiments are carried out about the true three axial mechanics experiments subjected to different restraint mechanism. The experiments mainly include the influences about the strength and rigidity to stress and strain after peak strength, and throughout the whole crushing process. Meanwhile, the stress-strain curves are plotted on the same graph, and the constitutive relations are qualitative discussed considering of various factors about economy, security the reliability and efficiency, etc., in the end, the domain of rock constitutive relation is drew. So in the engineering practice, the stress strain values just can fall on the domain before determined. In such cases, it can avoid that constitutive relations is too complicated to convenient generalization problem, and more important, the post peak constitutive relations are consistent to actual engineering rock mass, these make rock mechanics results to transit for rock mass mechanics providing a a new way.

To determine the development situation of surface cracks after the underground coal seam mining, this paper analyzed force of natural soil and its limit equilibrium state, and applied the Mohr-Coulomb criterion to study law of development regularity for surface cracks.Under action of the additional stress which generated by coal seam mining, this paper deduced calculation formula of critical horizontal deformation, crack depth and crack width. With assignment the test parameters of loess physical and mechanical properties in the mining area, and compared theoretical calculation formula results with the actual crack width, the results show that the theoretical formula calculation results in the article has a high credibility.

In order to simulate 3-D initial geostress field accurately and lay a foundation for the following numerical analysis of underground engineering, a new method was put forward to simulate geostress in ANSYS only by setting poisson’s ratios in three orthogonal directions of formation through assuming the formation as the orthogonal anisotropic material and using its elastic constitutive relation. The results show that the geostress distribution simulated by the new method coincides with the theoretical values well; the initial displacement eliminated by the equivalent node reaction force balance method is below 10-15 m, which could meet the accuracy requirement; when the formation material is elastic, this method is applicable to all common elements, however, when the formation material is elasticoplastic, such as DP material or bilinear kinematic hardening material, only partial elements like SOLD45 are applicable. Overall, the new method avoids the complex programming process in the conventional simulation and has good feasibility and high accuracy.

To solve the problem that drilling in coal seam for gas drainage in Huangling mining No.2 Mine is easy to drill the roof and the floor of coal seam through, and cause drainage in blank zone and repeated cross, as well as small drainage area and short drainage time, this makes the gas control in advance impossible. Based on that, the gas drainage trial by directional long boreholes was carried out in medium-thick coal seam at No.409 working face in No.2 Mine. Through long drilling design and construction technology improvement, effectively improve the efficiency of construction. Two years after drainage, coal seam gas content is reduced to 1.56~1.73m3/t, drainage rate reached 42.52%~48.17%. The gas pressure of Coal seam reduced from 0.65 MPa to 0.19~0.28MPa.Time limit for the project was shorten 35 days, the initial flow of drilling gas was increased 1.46 times and total cost was saved 264600 yuan. Thus, effectively eliminated the coal extraction blind area and eliminated the gas overrun occur in the process of mining.

Based on extraction data from released coal-bed methane surface well in Huainan mine area, according to the GuQiao coal mine stratum condition for prototype, we do experimentation of Similar Material Simulation, combine the results of experiment, we discuss the stability problem of coal-bed methane surface well, educe the destroy mechanism of released coal-bed methane surface well in Huainan mine area. The findings indicate that coal-bed methane surface wells are easily destroyed in interface of loose strata and the bedrock and upper hard lower soft of bedrock. Well location should be closed with the place of inlet lane and return airway, far from working face, and the peak value of relative horizontal displacement between working face and wind lane. It’s conducive to CBM well location, improve the extraction results.

This paper studied the permeability of limestone on top strata of Ordovician due to the viewpoint that carbonate aquifuge is existed in the top of Ordovician in North China. Based on the investigation of the composition and structure of strata, we analyzed the relation between two key factors (clay content and porosity) with permeability coefficient of earth-rock aggregate. Laboratory test for permeability had been utilized in this study to measure the permeability coefficient with different combinations of clay content and porosity, determining the influence that exerted from both factors on permeability coefficient. According to the regressive analysis of experimental data, it is able to obtain the empirical relationship between both factors with the permeability coefficient of earth-rock aggregate. A formula for calculation of the permeability coefficient had been proposed and provide theoretical basis for actual engineering application.

The yangguanzhai exploration area is rich in coal resources, fracture and fold structure is developed on the basis of survey data, combined with regional geological background of the exploration area were analyzed and discussed the tectonic origin. Research shows that: the yangguanzhai exploration area is controlled by the NE trending anticline in early to mid NW extrusion forming structure, controlled by EW trending extrusion forming near SN trending fault, the latter by NEE to form NWW tectonic extension. Tectonic origin is Yanshan city early synsedimentary faults, structures in the area in the North West trending, tectonic stress as early anti spin clockwise extrusion, extrusion and extension period, tectonic structural superimposed on the early due to influences of structures on NW, the occurrence of coal is larger.

The simulation results will often lead to large errors when regional large rock engineering numerical simulation. After analysis of rock properties of different regions of the geological structure and the development of the situation are the fault changed significantly, which is caused by an important reason for the distortion simulation results.This paper attempts to use strength reduction factors are given for each characteristic regional approach to solve the problem of distortion simulation results, and made more reliable simulation results.

For permanent magnet coupling, the modeling and simulation is finished by using the software of Ansoft Maxwell. It is concluded that the air-gap is smaller and the torque is greater. The simulation shows that the rule of torque is similar to the mechanical properties of asynchronous motor along with the change of slip. Under the constant torque load, the feasibility of the speed control is analyzed by adjusting the air-gap size. Moreover, the overall design scheme of permanent magnet coupling’s speed control institutions are put forward. By comparing the commonly several kinds of speed control technology in coal mine production, it is revealed that the permanent magnet drive technology is more suitable for the downhole environment. Finally the issue that using permanent magnet coupling controls the speed on pump load can produce significant energy saving effect and economic benefits is discussed.

Floating harmful substance has been affecting people's daily production. Rotary jet generate equipment has an effective control on the spreading of floating harmful substance, such as dust, harmful gas and so on, especially on the close-distance pollution sources. Based on the theory of fluid mechanics, the numerical simulation for the suction flow field controlled by rotary jet generate equipment was made, and a numerical method was established. Then a grid division was carried out and analysis of the boundary conditions. Computational fluid dynamics software was used for the simulated calculation of this suction flow field. Results show that when the flow ratio is about 0.6, formation of the cyclone is stable. Meanwhile, suction effect control of different size of dust particles is better also. The calculation results agree with the experimental results, and provide a theoretical basis for the improvement of rotary jet generate equipment.

Mine hidden disaster sources are main causes of mine accidents, so the detection of mine disaster sources is an important method to guarantee the safety of mine. Mine intrinsically safe ground penetrating radar (GPR), such as ZTR12 GPR, with the characteristics of rapid, non-destructive and high resolution, is being widely used in the detection of unknown mine disaster sources. Existing ZTR12 GPR uses communication cable to realize multi-channel analog signal transmission. The interference between signals cannot be prevented with this method. Especially in the complex mine environment, signal is vulnerable to outside interference, causing instability and low SNR. This paper proposes a data transmission method based on Ethernet, using twisted-pair cable to transmit digital signal. The standard deviation’s volatility and similarity’s angle are applied to data stability analysis. The results show anti-interference ability and signal stability are greatly improved. Moreover, the replacement heavy communication cable with soft and light twisted pair makes ZTR12 GPR more portable.

In order to confirm whether the ZKX2448 linear vibrating screen was working in the structure resonance accurately, the ZKX2448 linear vibrating screen was tested and analyzed by using the INV3018CT 24 bits high precision data acquisition instrument and DASP-V10 analysis software. First through experimental modal and working frequency testing, qualitative judged that vibrating screen was working in nearly 7 order inherent frequency; Then measured vibration track of the screen by six measuring points, and compared to the modal shape to confirmed the sieve machine′s structure resonance; Finally, through the amplitude and phase of 6 points in X, Y, Z three directions, obtained deformation degree by quantitative, found the area where is easy to damage , and provided the basis for the choice of the reasonable working conditions.

High ash fine coal slime in western Guizhou was taken as study object in this paper. Size analysis, small float-sink test and flotation reagent system exploration were operated subsequently. Results show that, in this coal preparation plant, fine coal slime with size range lower than 0.045mm accounts for 43.30%, with ash content up to 47.97%, along with washability curves based on small float-sink test (ash curves is very steep), a conclusion can be obtained that this coal slime belongs to high ash-difficult to flotation-fine coal slime. Different collectors (diesel oil and n-dodecane), foaming agent (terpenic oil, DL-2-Octanol and MIBC) were compared as well. Results show when slurry concentration is 110g/L, collector chosen n-dodecane with concentration of 270g/t, foaming agent chosen MIBC with concentration of 6g/t, yield of flotation clean coal is 38.91%, with ash content of 11.14%, while that of tailing coal is 45.53%.

In order to study the effects of sludge on particle sizes, the particle sizes distributions of coal sludge slurry (CSSs) prepared by a wet-grinding process were studied through orthogonal test. And coal water slurry (CWSs) were also prepared at the same experiment conditions. Compared the particle sizes of CSSs and CWSs, the results shown that sludge can improve the cumulative distribution of fine particles in slurries. Dry sludge was more beneficial to the production of fine particles than wet sludge. The time of wet-grinding had a greater effect on particle sizes of CSSs than dispersant dosage. Additionally, high cumulative distribution of fine particles was one of the impact factors on the increase of CSSs’ viscosity and the decrease of slurryability.

In order to analyze the difference of spontaneous combustion characteristics between the fresh samples upgraded (SA) from 105oC to 800oC in fixed bed reactor and their samples suffering moisture re-adsorption (SC), the oxygen adsorbed and heating rate is obtained by the oxidation test of temperature programming. The results show that the absorbed oxygen at critical temperature for SC reduced exceeding 60% comparing with SA. But catalytic action of water resulted in that the increase for instantaneous heating rate of SC is more quickly than SA at the acceleration oxidation stage, which means the self-heating for SC is faster. Based on assessment of FCC, the spontaneous combustion tendency for SC upgraded at 200~400oC went distinctly beyond SA. So storing at high moisture environment could counteract the effect that upgrading reduced the spontaneous combustion liability for lignite.

Packer is mainly in the process of grouting will wait for drilling in accordance with the design requirements of the grouting space, used to implement the segmented grouting, the slurry into the design of rock fracture or pore inside, even at the same time with the drilling borehole wall form a seal to prevent slurry returns, etc. Is one of the key equipment in the grouting engineering construction. In view of the present our country there is no effective grouting sealing equipment about deep level bare hole, developed hydraulic setting packer, achieved in cross grouting sealing equipment. This paper introduces the packer structure composition and the working principle, and the current domestic coal mine shaft surface pre grouting comparing several packer, analyses the characteristics of its use.

Positioning technology is one of the technologies for mobile vehicle in coal mine, which can lay the basis for realizing the cooperative automation of coal mining equipments. Aiming at the problem of GPS unavailable in coal mine enclosed environment, a new method was proposed which adopt an inertial measurement unit including three-axis accelerometers and gyroscopes to estimation the pose, acceleration, velocity and position of mobile vehicle in coal mine. Then, the position and pose performance of mobile vehicle was tested and accumulation error of position estimation was revised on the positioning platform. The experiments results indicate that the inertial measurement unit can keep effective pose tracking for mobile vehicle and reduce the accumulation location error under the state estimation in the coal mine.

The article expounds the connotation and elements of coal and non-coal industry bidirectional technology transfer, and analyzes the factors and the basic characteristics which restrict our country bidirectional technology transfer of coal and non-coal industry. Then on this basis compares different modes of technology transfer and put forward relevant policy suggestions.