After the closure of the Beijing West mine, 710,000 m3 of available special underground space and 774,000 m2 of ground industrial square will be formed, and nearly 100 billion of assets will be idle. Therefore, the development and utilization project of the Beijing West mine closure will be divided into three phases to create a sustainable green ecological industrial belt, namely: "Science popularization and education as the leader, health industry as the leading, cultural tourism and leisure as the feature, green smart energy as the foundation". The National Production Safety Accident Pre-control and Emergency Treatment Technology Experiment and Training and Popular Science Base (Phase I) project is the first phase of the development and utilization of Beijing West mine shutdown. It includes six parts: disaster prevention technology support platform, emergency management ability training curriculum system, emergency management information research and training platform for basic conditions construction, emergency management characteristic education curriculum system, emergency practical training and drill and knowledge and culture popularization platform, which are specifically composed of 26 construction modules. A total of 1,827 sets of professional instruments and equipment, 54 development courses, 156 sets of books and literature, 180 trained teachers introduced, 1,609 sets of reconstruction and expansion facilities (items), and 3147m underground roadway of Qianjuntai well, striving to build an international first-class science and education base serving production safety and emergency management. It is divided into two parts: (1) The Beijing West Scientific Research Base will transform the original ground and underground building facilities of Qianjuntai, build functional modules of disaster prevention and emergency technical equipment R&D, public emergency drill and science popularization, and trainees' practical training and practice, so as to form a working and living environment for 200 people; (2) Beijing Eastern Training Base has established a scene simulation and safety and emergency ability training platform for disaster prevention institutions in the South campus of North China Institute of Science and Technology, and has used Internet + to share the resources of Beijing Eastern and Beijing West to improve the professional level of safety emergency students and meet the training requirements of 300 people. At present, the construction plan of the base has been approved, and the special fund of 300 million yuan for safety production prevention and emergency has been allocated to Jingmei Group, which has completion of preliminary testing, design and bidding work, has entered the construction phase.

Aiming at the problem of coal mining under the industrial square of Chazhuang Coal Mine, the continuous mining and paste filling technology are designed, the parameters of key equipment involved in mortar production and gangue crushing treatment are given, which realize green filling on the basis of ensuring the paste quality. The filling industrial pump is used to pump the paste, and the upper port of the filling roadway is sealed with a jet to ensure the top connection rate. During mining impact analysis, it was found that after paste filling, the maximum roof separation was 20.5mm, the maximum surface subsidence was 27mm, and the ground buildings are within the Class I damage level of the building , which proved the feasibility of the scheme and effectively solved problem of the coal mining under the buildings of the mine.

Abstract: In view of the problems of backward equipment and high mining cost in Fucun coal mine, and considering various factors such as safety, economy and resource recovery, this paper puts forward the idea of building a large high-intelligentized working face for thick coal seam in Fucun coal mine.Village coal mine according to pay 3 coal seam occurrence condition, the integrated control platform based on intelligent mining equipment, combined with large mining height are broken hydraulic support intelligent electronic control system, large mining height are broken the intelligent control system of shearer and the mobile Internet cloud storage system, the key breakthrough the main profile monitoring equipment, large mining height face mining technology, intelligent remote control and centralized monitoring technology, realize the independent position of shearer, memory, cutting, automatic hydraulic support with the machine moving frame, full face a key sequence start-stop, fault automatic sequence downtime, compressors collaborative control, optimization of the mine informatization system,An intelligent Internet cloud platform for fully mechanized mining face has been established.Results show that the November 2017 on the pay 3 village coal mine 1008 working face in engineering application demonstration, face ShengChanBan personnel number instead of 12 people reduced to 5 checking, attrition rate is above 50%, coal of 6000 t, technology application effect is remarkable, set up the date mining group 6 m production pattern, the intellectualized mining of thick coal seam in thick coal seam mining height are broken references are provided for the development of intelligent manufacturing system and the practice basis.

This article proposes a new type of protection circuit for intrinsic safety power supplies in order to address the safety issues of overcurrent and short circuit. The circuit replicates the main circuit current by a certain proportion through a current mirror circuit, and samples the current signal through the secondary circuit. After amplification and offset processing, the signal is input to the negative input terminal of a comparator, while the positive input terminal is connected to the short-circuit detection signal. When the power supply load experiences overcurrent or short-circuit faults, the hysteresis comparator outputs an overcurrent or short-circuit control signal, quickly turning off the main current switch and thereby protecting the load from the main circuit. At the same time, the microcurrent switch is activated to detect whether the short-circuit fault has been eliminated, so that the main current switch circuit can automatically recover after the fault is eliminated. In addition, the soft start circuit of the power protection circuit is used to solve the problem of overcurrent protection false triggering that may be caused by surge current during the power startup process.

In order to ensure the timeliness, accuracy and effectiveness of coal mine group's control over the safety production of subordinate coal mine enterprises, and promote the safe and efficient production of coal mine enterprises, an integrated management and control platform for coal mine groups was proposed. The platform uses B/S architecture to design the access layer, infrastructure layer, data resource layer, business support layer and application layer as the core, and security operation and maintenance management and standards as the overall architecture of the guarantee system. The design and platform implementation of the three functional modules of the business subsystem, visual large screen subsystem and mobile application APP are described in detail. The practical application results show that the platform has a stable operation and significant effect, which can meet the needs of coal mine group level for safety production supervision and auxiliary decision-making of subordinate coal mine enterprises, and plays a certain role in promoting the digital transformation and upgrading of coal mine group companies.

In view of the worsening ecological environment around coal mining areas, this paper evaluates the current ecological status of coal mining areas in Shanxi Province from three aspects: ecological sensitivity, ecological source and ecological security pattern based on ecological concepts. Firstly, based on the five factors of ecological sensitivity, such as slope, slope direction, elevation, vegetation index and land use type, the comprehensive sensitivity of coal mining areas is generated to obtain the ecological sensitivity degree of each coal mining area. Secondly, MSPA analysis method is used to identify the ecological source area, so as to further obtain the impact degree of coal mining areas on the ecological source area. Finally, MCR analysis method was used to evaluate the ecological security pattern level of coal mining areas in Shanxi Province. The research results show that Changzhi, Linfen, Jinzhong and other cities are located in more coal mining areas with high ecological sensitivity, and the coal mining areas in these urban areas have a large impact on the ecological source area, and the ecological security pattern of coal mining areas in Shuozhou, Yuncheng, Changzhi and other cities is low, which needs to be emphasized in the future ecological restoration work.

In order to study the roof structure characteristics and support technology of gob-side entry retaining, based on the thin plate theory of elastic mechanics, the roof hanging plate structure model of gob-side entry retaining was established, and the principal stress expression of hanging plate under two boundary conditions was deduced. The stress proportional coefficient was constructed as the failure criterion of thin plate, and the composite support technology of cable-stayed anchor cable and super high water material was developed. The results show that the roof can form a suspended plate structure when the advanced pre-splitting roof cutting is carried out in the process of gob-side entry retaining with bolt-mesh-anchor support. With the movement of the overlying roof, the structure can form two kinds of suspended plate forms : one side simply supported and one side free and one side clamped and one side free. Under the action of mine pressure, the failure parts of the two kinds of hanging plates are different, which can be used as the basis for arranging the roof cable-stayed anchor cable. The roof cable-stayed anchor cable has suspension and horizontal extrusion effect on the suspension plate. The field test results prove the reliability of the theoretical analysis.

The stress of the concrete wall and coal pillar along the roadway is closely related to the structure formed by the collapse of the rock layer above. In order to obtain the caving structure and fracture evolution law of overlying rock on the goal-retaining working face of Daliuta coal mine, the study on the overlying rock structure and fracture evolution law of 52606 working face of Daliuta coal mine was carried out by using the method of similar material simulation experiment and theoretical analysis, and the influence of the change of buried depth from the cutting hole side to the stopping line side on the ore pressure development of 52606 working face was revealed. The influence mechanism of buried depth on mine pressure and surrounding rock along goaf is put forward. The results show that after the mining of the 52606 face, the burial depth gradually increases from the cutting hole to the stop-mining face, and the corresponding period of pressing step increases. The period of pressing step is 10m when the depth near the cutting hole is shallow, and the period of pressing step increases to about 20m with the increase of burying depth. At the same time, the corresponding caving Angle is obviously different. The caving Angle on the side of the stop-mining line with larger buried depth is 34°, and the caving Angle on the side of the cut hole with smaller buried depth is 43°. In the process of advancing the working face from a small buried depth to a large buried depth area, the range of abutment pressure stress increase, the stress concentration coefficient increases, the distance from the peak stress position to the working face decreases, and the crack density of the working face roof increases, which is not conducive to the formation of support structures in the large buried depth area and is not conducive to the stability of lane retention. The above analysis is consistent with the field observation.

Grouting water plugging is one of the main means to prevent mine water disaster. Based on the grouting project of Qiuji Coal Mine in Huanghebei Coalfield, this paper scientifically analyzed the grouting effect of limestone directional drilling by XGboost, support vector machine, K-nearest neighbor and BP artificial neural network. The research shows that the model accuracy of XGboost, support vector machine and K nearest neighbor is less than 0.9, while the fitting degree of BP artificial neural network test is 0.93. The accuracy of field data test is 0.9, which proves the feasibility and accuracy of BP artificial neural network in evaluating grouting effect. Finally, an intelligent evaluation method of grouting effect based on BP artificial neural network is proposed by MATLAB, and a simple demonstration platform is made according to the model, which realizes the intelligent and rapid evaluation of grouting effect, and has a scientific guiding role for the development of mine grouting effect evaluation theory and coal safe mining.

In order to solve the problem of lost circulation during infill drilling in mature blocks of the Qinshui basin, a 3D wellbore fracture model was developed based on the study of the actual well bore structure in the blocks, Ansys-fluent software is used to simulate the flow of conventional mud plugging, pressure mud plugging, gel mud plugging in formation fractures, and the simulation results are verified by field construction examples. The results show that the time of plugging (Gel plugging < Pressure plugging <Conventional plugging) , the return height of cementing annulus cement (Gel plugging > Pressure plugging > Conventional plugging); Combined with the advantages and disadvantages of the three lost circulation techniques, it is shown that the effect of gel plugging is better if a single point loss occurs and the lost circulation location is clear If the leakage point is more, and the leakage location is not clear, then the pressure plugging effect is better. In addition, compared with the conventional static plugging technology, the optimized plugging technology combined with wellhead pressure technology has the advantages of shorter plugging time, higher pressure bearing capacity of the lost formation and better plugging effect, and the required pressure bearing equipment is easy to make on the spot, simple operation, stronger applicability.

Focusing on the stability of N2 laterite and the protection of water resources in the key aquiclude of water-preserved mining in shallow coal seams in Northwest China, the development characteristics of water-conducting fractures and their influence on the stability of N2 laterite aquiclude in typical working face of thin bedrock and thick soil layer in Yushen mining area of northern Shaanxi were explored by means of theoretical analysis, numerical simulation and field measurement. The results show that the height of the water flowing fractured zone is 57.9~113.9 m by theoretical calculation, and 121.10~139.79 m by field measurement. The numerical simulation analysis shows that the development law of water-conducting fracture zone of overburden rock under different working face lengths is similar. When the working face length reaches 170 m, the height of water-conducting fracture increases slowly, and the maximum value is 96.5 m. The water-conducting fracture zone of coal seam mining basically develops to the bottom of N2 red soil layer after penetrating bedrock. Based on the analytic hierarchy process, the evaluation model of mining damage of N2 red soil layer is constructed, and the main factors affecting the stability of key aquiclude of N2 red soil are clarified. Based on the evaluation results of the development height of water-conducting fracture zone, the thickness of red soil layer and the distance between red soil layer and main coal seam, and considering the residual thickness of red soil layer, the results of water-preserved mining are evaluated, and the stability criterion of aquiclude is determined. The research results have important reference significance for safe green coal mining and water resources protection under similar geological conditions in northern Shaanxi coalfield.

The comprehensive management of coal mine spontaneous combustion is of great significance for safe mining work. In response to the coal spontaneous combustion accident in the F1301 re mining face of Yunhe Coal Mine, based on the actual situation of F1301 mining face, the hidden dangers of coal spontaneous combustion in the working face are analyzed. Based on the gas sample data from the intake and return air channel drilling, the risk level of coal spontaneous combustion in the goaf on both sides of the working face roadway is divided into three levels: high risk, general risk, and low risk, A fire prevention and monitoring system and comprehensive treatment technology have been proposed and applied in practical engineering. The application results show that the overall CO concentration in each observation borehole shows a fluctuating and decreasing trend, ultimately stabilizing below 24ppm. This effectively suppresses the oxidation process of residual coal in the goaf, eliminates the hidden danger of coal spontaneous combustion in the adjacent 1301 and 1302 goafs during the mining process of F1301 working face, and is conducive to ensuring the smooth subsequent mining of F1301 working face, At the same time, it provides a certain technical reference for the fire prevention and extinguishing design of other similar mines.

Against the problem of insufficient research on mining pressure manifestation in relatively deep mining depth of the superlarge mine represented by Shendong Mining area, this paper takes 22208 fully mechanized mining face of Buertai Coal mine as the engineering background, and conducts field research and numerical simulation on the ground pressure under this condition. The following conclusions are obtained: 1) The roadway deformation monitoring shows that the total subsidence of the tailgate roadway is not significant, deformation of coal face side is 150 mm, the other side is 50mm, the maximum roof separation is 5 mm, the roadway deformation degree is controllable; 2) The stress monitoring shows that 45 m advancing from the working face begins to enter the area affected by the advanced stress, and the stress value begins to increase significantly. At about 10 m, the stress is obviously increased, and the coal wall may have a drum, a rib, and even the possibility of blasting. It is speculated that this section is in the peak area of advance abutment pressure. Therefore, the stress must be strictly implemented in advance anchor cable protection. 3)Numerical simulation analysis shows that under the support mode of anchor bolt and cable, the range of principal stress and shear stress are reduced compared with that without support, and the integrity of surrounding rock is improved. The number of plastic blocks in the roof decreased, mainly due to tensile failure. The plastic zone of the two sides of the roadway is smaller, and shear failure is the main failure. The research can provide reference for mining pressure control of fully mechanized mining face with high mining intensity under the condition of deeper buried depth in Shendong mining area.

Aiming at the problems of large engineering quantity, high cost and influencing mining replacement in high drainage roadway, the reasonable layout range, drainage mechanism and key influencing factors of directional long borehole in roof are analyzed. According to orthogonal experiment and variance analysis, the sensitivity index of extraction effect was determined. In the 1305 working face of Licun Mine, the test of roof directional long drilling instead of high drainage roadway was carried out. The test results show that the roof directional long drilling achieves the effect of gas drainage in high drainage roadway, and the gas concentration in the upper corner is controlled within the safe range. The construction progress is fast and the cost is low, which effectively solves the tense situation of mining replacement in Licun Mine.

In order to optimize the cross-section shape of gently inclined semi-coal roadway with high ground stress, the study was carried out with the roadway of 3018 working face in Donghuantuo Mine as the engineering background. The analytic stress solutions of different cross-section shapes in inclined coal seam are derived by the theory of complex variable function, and then the stress concentration and plastic zone of tunnels with different cross-section shapes are solved by FLAC3D numerical simulation, and the optimal cross-section shape of tunnels is determined on this basis. Finally, the reliability of the research results is verified by field industrial tests. The results show that the failure of gently inclined semi-coal roadway is asymmetric under the action of high ground stress; Regardless of the cross-section shape, the roadway presents high stress concentration at the left and right bottom corners, and the stress concentration degree is rectangular > trapezoidal > straight wall arch; The stability of straight-wall arched roadway is the best, followed by trapezoidal roadway, and the rectangular stability is the worst. It is determined that straight-wall arched roadway is the final roadway section shape. The monitoring results of roadway surface dis-placement show that the straight-wall arched roadway can better meet the requirements of on-site safety production.

In view of the technical problem that the upward mining of overlying rock movement may destroy the integrity of the upper coal seam and easily cause the upper coal seam to be unable to be mined，Based on the engineering background of the influence of the mining of 9 coal face on the mining of the overlying 5 coal seam in a certain mine, this paper uses the methods of theoretical analysis, numerical simulation and physical simulation to study the damage of the overlying rock of the upper strata after the mining of the coal seam in a short distance, the development law of the rock fissure and the law of the mining pressure of the working face.The results are as follows:①The range of the plastic zone of the upper strata after the mining of the 9 coal seams under the close coal seam is analyzed theoretically, and the average height of the collapse zone is 9 m and the height of the water-conducting fracture zone is 36 m according to the three-zone discrimination method； Kobtained by ratio analysis method is 19.99, which is greater than 7.5 for medium hard rock stratum; The interval obtained by the surrounding rock balance method is 45m, which is far less than the interval between Coal Seam 5 and Coal Seam 9；②The numerical simulation shows that the overlying 5 coal seams of the 9 coal seam working face under the close coal seam are located in the plastic area formed after the mining of the lower coal seam, and there will be no stress concentration in the area where the protective coal pillar is left；③The physical simulation shows that the maximum subsidence value of coal seam 5 is 10 mm and the height of the model collapse zone is about 15 cm after the mining of coal seam 9 in close proximity, which conforms to the development law of mine pressure and overburden movement. Relevant research results demonstrate the feasibility of upward mining of the overlying 5 coal seam after the mining of the 9 coal seam in close distance.

Taking the gob-side entry retaining of 2401 transport roadway in Shunhe Coal Mine as the engineering background, the structural characteristics of surrounding rock of roadway are analyzed. Based on the stability of local spatial structure of roadway, the mechanical structure models of non-roof cutting and roof cutting of gob-side entry retaining are constructed respectively, and the physical similarity simulation test is carried out with different roof cutting heights of roadway. The results show that the gangue cut off in the goaf increases the support force to the key block, weakens the extrusion of the key block to the end of the direct roof hanging wall, and reduces the support resistance by 35.78 %. With the increase of roof cutting height, the cantilever on the goaf side end of roadway roof slowly transits from F type to large I type, and the large protection structure has the trend of upward translation. Compared with the uncut top 1 roadway, the superimposed stress peaks of 4cm roof cutting 2 roadway, 8cm roof cutting 3 roadway and 16cm roof cutting 4 roadway decrease by 9.38 %, 28.13 % and 25.00 % respectively. Combined with the roof lithology of the roadway, the roof cutting height is finally determined to be 8.2 m, and the retaining section adopts three columns of single hydraulic props as roadside support. The long and short anchor cables are reinforced in advance, and the surrounding rock of the roadway is stable, which can better meet the requirements of use.

Prestressed anchoring technology is widely used in coal mine roadway roof support, but at present, the disassembly of mine anchors is still carried out manually. In the process of disassembly, the disassembly load is high, and the remaining load of anchor cable after disassembly is not zero, so the safety of the disassembly process is poor, and the subsequent operation has security risks. This paper takes B-type mine anchorage as the research object, establishes the sub-field model during its disassembly, analyzes and determines its key problems, and carries out the structural improvement design of mine anchorage based on the sub-field model transformation method, and carries out the structural optimization with the assistance of the unloading experiment. Finally, an improved detachable mine anchor is proposed and tested in underground. The test results show that, compared with the commonly used mine anchors, the proposed demountable mine anchors after structural optimization can achieve rapid and efficient removal, and at the same time, the removal force of the anchors is small, the residual stress of the anchor cable is zero, and the unloading process is safe and reliable.

In order to reveal the influence of the migration of thick and hard stratum on the evolution law and variation characteristics of the front abutment pressure of working face, taking the typical super thick and hard rock formation condition of a mine as the model, by means of physical simulation experiment method and mechanical simulation experiment method, the model is compared with the model of no thick and hard stratum in overlying strata.Through research, it has been found that the influence of super thick and hard stratum on the front abutment pressure of working face mainly concentrates in the stage before the breaking of super thick and hard stratum. At this time, the stress concentration degree in front of working face is high, the influence range is wide, and the influence degree is severe. When the super thick and hard stratum is about to break, for the working face with super thick and hard stratum in the overlying strata, the peak value and influence range of the front abutment pressure are 1.15 and 1.9 times as large as those without super thick and hard stratum respectively. When the super thick and hard stratum is stable or broken, for the working face with super thick and hard stratum in the overlying strata, peak value of the front abutment pressure and the influence range are relatively small comparing with working face without super thick and hard stratum in the overlying strata, the influence on the working face is relatively weak. The increase of the peak value of the front abutment pressure will inevitably lead to an increase of the influence area of the coal wall in front of the working face.

In order to meet the application requirements of high strength composite rock bolt pultrusion molding, epoxy resin matrix cured by acid anhydride was developed. The rheological properties, curing properties of the resin matrix and mechanical properties of the casting body were studied, and the Arrhenius viscosity model was established to predict the viscosity characteristics of the resin. The results showed that the developed epoxy resin matrix has the advantages of low viscosity, long operation period and concentrated heat release in curing reaction. The tensile strength, elongation at break and bending strength of resin castable are 74.25 MPa, 4.48% and 127 MPa, respectively, which meet the requirements of high strength composite bolt pultrusion production process and performance. In addition, high strength glass fiber was selected to prepare 22 mm diameter full thread composite bolt, the tensile strength and transverse shear strength of bolt body reached 1027.3 MPa and 223.6 MPa, respectively, which meet the requirements of high strength composite rock bolt.

Based on the intelligent early warning platform for impact pressure, this paper analyzes the current situation of impact pressure in Zhang Shuanglou Coal Mine and the effectiveness of monitoring and early warning based on the complex causes of impact pressure and the low accuracy of early warning caused by a single early warning monitoring. In the background of intelligent mine concept, the monitoring and early warning framework is "stress field-energy vibration field-deformation field", and the multi-participant monitoring and early warning method with stress, vibration wave, drill chip volume and ground sound value as parameters is proposed from two dimensions of internal and external causes of impact ground pressure initiation, which is combined with parametric analysis technology to systematically and comprehensively evaluate the change characteristics of each monitoring data before the occurrence of impact ground pressure. This method is used to evaluate the change characteristics of the monitoring data before the occurrence of impact pressure, and to provide a basis for early warning and scientific and timely relief of the impact pressure in Zhang Shuanglou coal mine. The results of the field application show that the comprehensive warning capability and accuracy of the multi-parameter monitoring and warning method are significantly better than that of the single-indicator warning system, which provides a reference value for the promotion of safe mining and intelligent mine construction.

In order to solve the difficulties in monitoring and testing the operation mode of fully mechanized mining equipment in coal mines, and to improve the intelligent level of fully mechanized mining working faces in coal mines, key technologies for virtual production of fully mechanized mining equipment based on digital twins and virtual reality were studied, and a virtual production system for fully mechanized mining equipment driven by digital twins was constructed. Based on digital Li Sheng modeling technology, a theoretical method for three-dimensional virtual reconstruction of mines is proposed by analyzing geometric and kinematic relationships; Based on the dynamic simulation technology of fully mechanized mining equipment and the virtual on-site technology of fully mechanized mining equipment, an offline simulation system for virtual fully mechanized mining working face has been constructed; Based on data-driven virtual real bidirectional interaction mapping technology and virtual monitoring technology, a virtual real interaction channel was established to achieve twin data transmission and iterative optimization, and a semi physical simulation system for fully mechanized mining face was constructed; The offline simulation system of the above virtual fully mechanized mining face and the semi physical simulation system of the fully mechanized mining face were integrated into a digital twin driven virtual production system of fully mechanized mining equipment and tested. The results showed that the constructed virtual working face offline simulation system can achieve accurate and reliable twin simulation of the physical working face, and the semi physical simulation system of the fully mechanized mining face can enable the virtual hydraulic support to accurately execute the actions issued. The application of key technologies and systems for virtual production of fully mechanized mining equipment is expected to provide new ideas for the intelligent monitoring and operation of fully mechanized mining equipment in coal mines, and bring positive impacts on improving production efficiency, reducing production costs, and reducing accident risks in coal mines.

As coal mine safety and production become more dependent on grid stability, it is increasingly important to accurately assess the safety level of coal mine power supply systems. General grid evaluation strategies often use the average state level to characterize the safety of the system, which ignores the influence of extreme individual components in the power grid on the entire system, so it cannot accurately describe the safety level of the coal mine power supply system. Combined with the actual operation characteristics of coal mine power grid, a reliability evaluation strategy based on expected fault information is proposed. This strategy evaluates the security level of the system by analyzing the comprehensive evaluation method of the system as a whole and individuals. At the same time, under the premise of weighing benefits and safety, two economic indicators of reliability cost and power outage loss cost are proposed, and the least squares algorithm is used to curve fit the historical data of the system, and the characteristic weight of system economy and safety and the relationship between system safety and economy are obtained, so as to obtain the optimal operation mode of the system. Finally, the feasibility of the proposed evaluation strategy is verified by practical examples.

For the coal gangue sorting process sorting rate is low, large gangue sorting effect is poor and other problems, by considering the gangue particle size, sorting time, gangue and sorting area boundary distance and other factors, the construction of gangue priority model, proposed a coal gangue sorting multi mechanical arm task allocation strategy, and the sorting rate as the standard for evaluation. Finally, using the distribution strategy of this paper for simulation, the results show that the allocation strategy in this paper works better than the traditional strategy, improves the sorting rate, reduces the leakage of large size gangue, when the gangue spacing is constant, the number of gangue changes, the sorting rate fluctuates less, in about 3%, to verify the effectiveness of the distribution strategy in this article ; gangue spacing has a greater impact on the sorting rate and the number of sorting robotic arms, when the spacing of gangue increases, the sorting rate increases; when the gangue spacing is above 250mm, three sorting robotic arms can ensure a higher sorting rate.

Underground coal mines are often disturbed by acidic water corrosion and dynamic loads such as mining and blasting. it is of great significance to study dynamic mechanical behavior of coal based on acid corrosion to ensure the safety of coal mine production. In this study, the split Hopkinson bar (SHPB) system was used to carry out dynamic tensile tests on coal before and after pH= 2,4 acid solution treatment. Based on the X-ray diffraction (XRD) test results, the correlation between the damage mechanism of acidic on coal and mechanical properties was explored. The results show that the dynamic tensile strength of coal displays an apparent rate dependency, but the rate dependency is weakened by acidic corrosion. The stronger the acidic is, the more significant the weakening effect is. At the same loading rate, the relationship between the tensile strength of different coal samples is raw coal > pH=4 > pH=2. After acid corrosion, the dissipated energy and the growth rate of dissipated energy decrease obviously. XRD test shows that damage mechanisms in acid to coal is manifested in its removal of inorganic minerals and small molecule organic matter in coal, which leads to a decrease in the mechanical properties of coal.

In order to reduce the moisture of flotation concentrate filter cake and accelerate the cake formation speed, non-ionic polyacrylamide (PAM) with molecular weight of 7 million and non-ionic surfactant (L-64) were selected and dewatering tests were carried out in a laboratory pressurized filtration system using dosing methods such as separate addition and mixed addition. The mechanism of enhanced dewatering by compound dosing was investigated by contact angle measurement, infrared spectroscopy, surface tension of the filtrate and floc morphology observation. he results show that PAM can accelerate the dewatering speed but the effect of water reduction is average, L-64 can obviously reduce the moisture of fine coal but the filtration speed is average; the compound addition of chemicals can effec-tively reduce the cake formation time and reduce the moisture of filter cake, under the same amount of chemicals added, adding PAM first and then L-64 is more beneficial to reduce the moisture of filter cake, and adding L-64 first and then PAM is more beneficial to reduce the cake formation time. The paper proposes a dual objective dewatering efficiency enhancement level evaluation model based on filter cake moisture and cake formation rate, and gives the optimal dosage of compound chemicals. The compound dosing can improve the hydrophobicity of coal surface, reduce the surface tension of filtrate, and form a floc structure with good looseness and permeability, which is conducive to the removal of capillary water between coal particles, with the dual effect of reducing the moisture of filter cake and improving the filtration speed.

In order to realize the "zero emission" of coal gasification technology, it is necessary to solve and develop the environmental protection and safe utilization of gasification slag. The residual carbon of gasification fine slag is the solid waste produced by coal gasification technology, and its comprehensive utilization is an important factor for the whole coal chemical industry project to realize circular economy. In this paper, carbon materials with porous structure were made by using residual carbon from gasification fine slag as carbon precursor and KOH as activator. Firstly, the effects of different mass ratios of carbon to alkali (1:1, 1:2, 1:3, 1:4) on the structure and electrochemical properties of the prepared carbon materials were investigated and compared. The results showed that the activated gasification fine slag residual carbon (CK-2) obtained at 500℃ for 90 mins in N2 atmosphere and under the condition of the mass ratio of carbon to alkali 1:2. has better electrochemical performance. When the current density is 0.5 A/g, the mass specific capacity of CK-2 reached 86 F/g, showing good rate performance. The mass specific capacity of CK-2 was about 1.5 times higher than that of untreated residual carbon. The reason might be that under the condition of activation, on the one hand, KOH reacted with inorganic minerals such as silicon-aluminum oxide, and the content of inorganic minerals was reduced by acid washing and increased the carbon content; on the other hand, KOH reacted with active carbon atoms to form pores in the material in real time and resultantly modified polar oxygen-containing functional groups. Secondly, the selected activation material CK-2 was used as an active material to assemble a symmetrical capacitor. Under the current density of 2 A/g, the energy density of the supercapacitors reached 4.72 Wh/Kg. After 10000 cycles, the capacitor could keep 89% of the initial value, showing excellent energy density and cycle stability.

In order to systematically study the influence of irrational emotions on the conflict between miners and managers, a game evolution model of conflict between miners and managers based on RDEU theory was constructed. Through the simulation analysis of the assumed income value, the influence of emotion on the behavior strategy of game players is obtained. The results show that when the players are pessimistic, they tend to adopt confrontational hardline strategies, whereas when they are optimistic, they tend to adopt conciliatory strategies. And the emotions of miners and managers and the probability judgment of the other party's choice strategy have significant influence on their own behavior decisions. The paper puts forward reasonable suggestions for the relevant departments of coal mining enterprises to realize effective control of conflict.

In order to solve the technical problems of testing items such as hydraulic support yield performance and base specific pressure, as well as the inability of existing hydraulic support testing devices to perform external loading, This paper designs a movable hydraulic support external loading and specific pressure testing device. This device uses 12 gas-liquid combined functional loading cylinders as external loading power sources and specific pressure testing data acquisition components, which can be respectively used for external loading and base specific pressure testing. During external loading testing, the multi cylinder synchronous loading based on high-precision rigid hydraulic synchronous cylinder adjustment technology is used to achieve the external loading function of the testing device; During the specific pressure test, the specific pressure distribution value is obtained according to the relationship between the "Gas Spring" settlement displacement and pressure data of different sections when the test device is loaded with external load. By conducting shrinkage performance and specific pressure tests on different specifications of hydraulic supports on different test rigs, it was found that the external loading test process was smooth and the specific pressure test data collection was fast and accurate. Actual testing has shown that the device has the function of shared use among different hydraulic support testing devices, which can effectively solve the technical problems of external loading and specific pressure testing of hydraulic supports.

In order to do energy saving and emission reduction, this paper designs an adaptive speed control system of coal mine transportation belt based on image recognition. The core of the speed control system is to obtain the coal flow accurately and quickly, so an efficient and accurate coal quantity detection method is designed based on common cameras. The cross section of coal flow is obtained through the registration of reference image and test image, and the area of coal flow area is calculated by Monte Carlo method. The experimental results show that the coal quantity detection is fast and accurate, meeting the real-time requirements of the speed regulation system. The system has the characteristics of low cost of transformation and upgrading, easy maintenance, strong environmental adaptability, and it has broad application prospects in coal mining field.