Based on the advantages of professional and core technology, Beijing China Coal proposes the service model of "Science and Technology Party B", which solves a large number of "stuck neck" technical problems in special well sinking by providing products and services with higher technology content, unleashing the scientific and technological efficiency of new quality productive forces, and leading the development of special construction technology of underground engineering in China. "Science and Technology Party B" realizes value creation with technical strength, and its main service products include freezing technology, grouting technology, drilling technology and equipment, Intelligent mine design and construction, and National Major Water Diversion Technology Services. "Science and Technology Party B" is a provider of technology + equipment + engineering overall solutions, and its ability to study and solve new technical problems in real time is more prominent in the implementation process, which has been tested in practice in the ground directional drilling pre-grouting project and water inrush emergency rescue and water plugging project of the Yellow River Diversion Project in central Shanxi Province.

The technology of gob-side entry retaining determines the mining efficiency and economic benefits of coal mines, and a reasonable method of gob-side entry retaining should be selected based on engineering geological conditions. Taking the 4303 working face of Shaqu Coal Mine as the engineering background, a comparative study was conducted on three types of gob-side entry retaining techniques: gob-side entry retaining with solid backfilling, gob-side entry retaining with cutting roof and gob-side entry retaining with solid backfilling exterior of roof cutting. Firstly, the displacement variational method in elastic mechanics was used to compare and analyze the roof subsidence of three different gob-side entry retaining methods. Secondly, FLAC3D numerical simulation software was used to establish calculation models for different gob-side entry retaining methods, and the lateral support stress of solid coal slope and surrounding rock deformation laws under three entry retaining methods were analyzed. The results indicate that: ①for lateral support stress: the gob-side entry retaining with solid backfilling exterior of roof cutting< the gob-side entry retaining with cutting roof <the gob-side entry retaining with solid backfilling; ②Compared with the subsidence of the roof of gob-side entry retaining with solid backfilling, the gob-side entry retaining with cutting roof decreased by 14.3%, and the gob-side entry retaining with solid backfilling exterior of roof cutting decreased by 23.8%; ③Compared with the bottom heave of the gob-side entry retaining with solid backfilling, the gob-side entry retaining with cutting roof decreased by 16%, and the gob-side entry retaining with solid backfilling exterior of roof cutting decreased by 12%; ④For the cost of entry retaining: the gob-side entry retaining with solid backfilling is similar to the gob-side entry retaining with cutting roof, and the cost of the gob-side entry retaining with solid backfilling exterior of roof cutting is the highest. Finally, based on the above research, the application of the gob-side entry retaining with cutting roof in the 4303 working face of Shaqu Coal Mine has achieved good application effect.

Aimed at the problems of shafts safety of Shengfu coal mine which influenced by the mining of surrounding coal mine，the research methods that combined theoretical analysis，field measurements and empirical analogy were used． Firstly，the protect coal pillars ranges of shafts were delimited． Then the movement and deformation at different positions of the shafts for three schemes (the working face mined normally，the coal pillar also mined，and the shaft overburden area not mined) were predicted．Finally，the classification of the mining damage grade，damage classification and structural treatment method of the shaft were proposed，the safety and stability of the shaft affected by mining was evaluated． The results showed that the main and auxiliary inclined shafts were not affected by the mining and the wind shaft was damaged at level I (slight) in the range of [0,50m] from the ground when the three coal 01 working face was normally mined，thus there had little impact on the safety of the shafts． But when the coal pillar was also mined and in the most unfavorable case，the main inclined shaft would be damaged at level II (general)，level I (slight) in the range of [0,70m] and (70,250m) from the wellhead respectively，and the wind shaft would be damaged at level III (heavy)，level II (general) and level I (slight) in the range of [0,33m]，(33,58m) and (58,90m] respectively，thus the highest level III damage to the air shaft，which would affect the normal use of the wind shaft．

The mining of close distance coal seam group leads to the occurrence of coal pillar group working conditions and makes its stress characteristics more complicated, which leads to the danger of mine production safety. In order to study the reasonable stagger distance of close distance coal pillar group, taking 8# and 11# coal seams of a mine in Shanxi as the research background, the mechanical calculation model of reasonable stagger distance of coal pillar group was constructed by theoretical calculation method. The reasonable stagger distance of section coal pillar was studied by means of numerical simulation, and the scientific rationality of the research was verified by field application. The research shows that the stress disturbance area of the coal pillar group can be divided into three areas : stress concentration area, stress disturbance area and stress superposition area. The stress distribution range is affected by the stress transfer angle of the coal pillar , the interlayer spacing H and the width L of the upper coal pillar, and has a linear relationship with H and a trigonometric function relationship with the stress transfer angle of the coal pillar. The interlayer spacing H has the greatest influence on the SL value. By numerical simulation and theoretical calculation, the reasonable staggered length of section coal pillar should be greater than 40 m, and YHY30 intrinsically safe borehole stress meter is used to monitor the field application. The monitoring data is similar to the theoretical analysis results, which verifies the accuracy of this study. At the same time, it provides a calculation model and solution for the reasonable staggered distance of section coal pillar under similar working conditions.

Abstract: In order to monitor the state of cemented backfill in coal mine, based on the characteristics of continuous mining and continuous filling technology and the characteristics of backfill, five basic contents of backfill state monitoring are proposed, mainly including liquid level monitoring, stress monitoring, strength monitoring, temperature monitoring and stress monitoring. The monitoring technology and monitoring scheme of each monitoring content are studied. The liquid level monitoring technologies such as reserved borehole, laser, radar and buoy are analyzed. It is considered that the buoy type liquid level monitoring has good adaptability; The retaining wall manometer is used for stress monitoring, with a range of about 150kPa; The monitoring technology of filling body tested in laboratory is put forward, and the in-situ strength testing technology is prospected; Temperature monitoring is realized by temperature sensor; KPa and MPa dual channel stress gauges are used for stress monitoring.

Aiming at the ecological comprehensive management of 51101 working face of Guojiawan coal mine, the UAV equipped with a five-lens tilt camera is used to obtain aerial photographic images, and after internal processing and 3D modeling, the real 3D model is obtained. By analyzing the precision of the image control points and 3D model, it proves that the UAV inclined photogrammetry fully meets the mapping requirements of large-scale topographic map for coal mine management. Relying on the real-life 3D model and the generated high-precision DLG data results, it effectively helps designers accurately and efficiently put forward the corresponding ecological management method of the mining collapse area, greatly improves the pertinence and efficiency of the collapse management and land reclamation work, and provides accurate and trustworthy technical support and results verification for the later acceptance of the project, and ultimately effectively solves the problems of surface deformation and ecological damage in the management area, which has good social significance, and also provides effective reference for the future mining treatment of coal mine subsidence area.

Aimed at the causes of shaft damage in Gongguang coal pillar mining and its prevention and control technology, taking Dashe Coal Mine in Handan, Hebei Province as the engineering background, the movement and deformation characteristics of surrounding rock in the shaft of Gongguang coal pillar mining are analyzed to reveal the causes of shaft damage; Propose the plan of preventing and controlling the shaft damage in the follow-up working face of the project, form the corresponding construction technology, and successfully apply the engineering practice. The research shows that the 92606 working face in Guangnei is adjacent to the auxiliary shaft, and the vertical additional force caused by mining is the cause of shaft damage; If preventive measures are not taken in advance, the subsequent mining of the 92606 working face will lead to secondary damage to the auxiliary shaft; The prevention and control scheme of single pressure relief groove without stopping production proposed in the study has the advantages of not affecting the mine production, high pressure relief rate, simple construction, low cost, etc. The technology of grouting behind the wall, cutting the pressure relief groove, and erecting dense well circles has successfully completed the project of preventing and controlling the damage of the auxiliary shaft without stopping production. The monitoring shows that the vertical and circumferential stresses of the shaft are less than the ultimate bearing capacity of the shaft wall, and the shaft is in a safe state. The operation is good and the expected effect is achieved.

In view of this situation that applying intelligent fast anchor complete equipment for large section of coal roadway in Caojiatan coal mine, facing equipment and tunneling process mismatch, unable to achieve completely parallel operation, based on the existing technical equipment and the field measurement and statistical analysis, the goal of improving the parallel operation rate of anchor excavation integration is realized. Carried out the field research, measured, theoretical analysis and numerical simulation, in the detailed measured tunneling face process flow, staffing, the process time for quantitative and theoretical research, for cutting, temporary support, permanent support, maintenance, various optimization and daily management. Combined with theoretical analysis and using numerical simulation studied the anchor density, length on the influence of roadway surrounding rock deformation law, on the premise of ensuring safety, put forward the anchor reduction and extension support scheme, namely on the premise of ensuring the original support strength, by increasing the bolt length and increase the bolt spacing to shorten the support time, improve the support efficiency, realize the parallel digging anchor synchronous operation. The research results provide some reference significance for the application of rapid tunneling construction in other coal mines.

After the coal seam mining has entered 1000 meters, it is difficult to keep roadway along gob due to the comprehensive factors such as the significant increase of ground stress, softening of surrounding rock, high gas and broken roof. In order to solve the self-formed roadway problem of roof cutting and pressure relief under complex deep conditions, taking the 703 working face of Hongyang No. 3 Mine as the research object, the constant resistance anchor cable support and self-formed roadway of roof cutting were integrated and applied, and the stress of roadway roof and the deformation of roadway surrounding rock were monitored. The results show that: Blasting cut in ahead of working face roof roadway were significantly reduce stress, a lane area of roadway roof subsidence is small, the overall even roof subsidence about 385 mm, maximum subsidence of about 280 mm, the average floor drum up even a maximum of 545 mm, rubble lane no obvious side drum phenomenon, help the entity coal help phenomenon, no significant piece of meet the requirements of safety and use, The deformation of surrounding rock of roadway is controllable and the effect of retaining roadway is good

In order to address the threat posed by water accumulation in the upper goaf of the Pingmei No. 5 Mine to the lower coal mining, an analysis of the spatial position and volume of water accumulation in the current goaf was conducted. Three drainage schemes were compared from the aspects of economy, rationality, and time efficiency. The advantages of directional deep-hole exploration and water release technology over conventional drilling exploration and water release technology were analyzed, and directional deep-hole exploration and water release technology was ultimately determined to be the optimal solution. Based on this, the construction process of this technology was introduced, and the scheme was designed and implemented in the field. Three drilling schemes were completed on-site: Scheme one: angle 11°, hole depth 280 m; Scheme two: drilling angle 9°, hole depth 280 m; Scheme three: drilling angle 6°, hole depth 271 m. Meanwhile, the use of Grouting Technology shortened the plugging time by 88% compared to traditional cement slurry plugging technology, and approximately 30,000 m3 of water was discharged from the goaf, solving the water hazard problem in the Ji15-32020 goaf. This achieved economically efficient prevention and control of mine water hazards and ensured the safe advancement of the roadway. It provides certain reference significance for the construction of directional deep-hole exploration and water release projects in mines under similar conditions.

In view of the current problems of surface subsidence control and solid waste disposal in mines, a fully mechanized gangue-throwing filling technology of "throwing instead of tamping" was proposed. Based on the principle of gangue-throwing filling technology, the mathematical model of gangue-throwing movement is constructed, and the basic parameters of gangue filling are obtained.On this basis, a simulation platform for gangue-throwing backfilling was built to carry out on-site sand throwing experiments, and the feasibility of fully mechanized mining gangue-throwing filling technology and the rationality of parameters were studied and analyzed.The results show that: (1) The actual measured values and variation rules of each parameter in the process of throwing gangue are close to the theoretical values, and the field design can be guided by theory. (2) When the throwing angle is 50° and the throwing speed is greater than 8m / s, it can meet the filling demand. (3) The overall filling rate of gangue filling can reach more than 95 %, and the accumulation angle of gangue is obviously higher than that of natural accumulation, and the filling effect is good.

In order to study the failure height of overlying strata after mining in the lower layer working face under thick alluvium and thin bedrock in Zhaogu No.1 Mine, theoretical analysis, numerical simulation, borehole flushing fluid leakage observation and borehole peeping method were used. The research shows that the development height of falling zone is 6.93 ~ 27.72 m and the development height of water-conducting fracture zone is 22.17 ~ 71.73 m after mining of lower layer working face calculated by empirical formula. The numerical simulation results show that when the mining height of the lower layer is 2.5m and the cumulative mining height is 6m, the maximum ratio of caving to mining is 2.61. When the cumulative mining thickness is less than 6m and the bedrock thickness is not less than 30m, and the clay layer thickness is greater than 5m, it can be considered that the clay layer thickness can block the upward development of the water-conducting fracture zone. Using the field measurement method, the falling zone is 15.26 m, the ratio of caving to mining is 2.62, the water-conducting fracture zone is 55.59 m, and the fracture ratio is 9.58 in the cumulative mining thickness is 5.8 m. The law of the failure height of the overlying strata after the mining of the lower layer working face can provide a theoretical basis for determining the thickness of safety coal ( rock ) pillar of waterproof and sand control in the lower layer working face.

In response to the long-term problems of low equipment matching performance, low intelligence level, low economic benefits, and high labor intensity faced by the mining of thin coal seam working faces, a new intelligent unmanned mining mode of "ground planning coal mining, automatic equipment execution, and unmanned operation in the face" has been constructed during the production of working faces, with ground process scheduling decision-making and automatic execution of underground equipment based on decision-making; We have established a complete set of key technologies for intelligent mining of thin coal seams, with the ground control center as the core and supplemented by a 10 Gigabit network communication platform above and below the mine, coal mining machine planning and cutting, hydraulic support master-slave scheduling, airborne audio and video devices, inspection robots, cable dragging, and the integration of three positions. Through industrial practice, it has been shown that this mode can reduce the number of workers in the working face from 3 to unmanned during production, and ensure safety if no one is present;and increase production efficiency from 12 to 14 per day, reaching a maximum of 16, with an average increase of over 17%.

Abstract: To improve the dust capturing and settling efficiency of the large-height comprehensive mining face in the coal mine, based on the analysis of the influencing factors of the dust reduction efficiency of the large-height comprehensive mining face and the testing of the nozzle atomization parameters through the laser fog diameter testing platform, flow monitoring device and multi-spectral laser particle size analyzer, the dust source tracking spray reduction system was developed to realize the "three-dimensional" tracking spray reduction of the cutting drum of the coal mining machine. The research and development of a dust source tracking spray dust reduction system realize the "three-dimensional" tracking spray dust reduction of the cutting drum of a coal mining machine. The results of the study show that: the dust reduction efficiency of spraying in large mining face is related to the parameters of nozzle water consumption, spraying coverage area and droplet size, and the dust reduction efficiency formula is established accordingly; the wind speed has an important influence on the dust reduction efficiency of the nozzle atomization, and the increase of the wind speed decreases the dust reduction efficiency of the nozzles for each individual nozzle; according to the results of the calculation of the dust reduction efficiency of the nozzles under the conditions of different wind speeds, the preferred recommended nozzle is SS150 The preferred nozzle is SS1507; a dust source tracking spraying system with flow control function is developed to realize the controllable tracking spraying dust reduction and reduce the water consumption; and it is applied on site in the large-height comprehensive mining face of 85219 in Sandaogou Coal Mine, and the total and respiratory dust reduction efficiencies of the upper drum position are 91.15% and 81.96% respectively, and the lower drum position is 91.15% and 81.96% respectively. After application, the total dust and respiratory dust reduction efficiency of the upper drum miner position is 91.15% and 81.96% respectively, and the lower drum miner position is 90.61% and 83.54% respectively. This spraying dust reduction technology significantly reduces the dust concentration in the space of the 85219 large-height comprehensive mining face, which is significant for the safe production of the mines as well as for the improvement of the workers' working environment.

Under the background of China's economic development in “new normal” and the promotion of the Belt and Road Initiative, the bulk material logistics and transportation demand of single wagon double open top container is accelerating. The existing loading technology can only meet the requirements of single container, cannot realize the continuous and efficient loading of single wagon double container. The two containers are usually placed unevenly, which also brings great difficulties to container loading. In order to solve the above problems, taking coal container loading as an example, according to the actual loading demand of 6500 t/h, the rapid quantitative loading scheme of containers is deeply analyzed, and the scheme of single set and double warehouse rapid quantitative loading system is finally determined, and a new technology of double warehouse cooperative asynchronous loading is proposed, which solves the problem that single wagon double container cannot be continuously loaded. The loading efficiency is greatly improved, and the loading quality is guaranteed. The engineering practice shows that the rapid quantitative loading system of bulk container realizes the automation and intelligence of the rapid quantitative loading process of container, and the maximum loading capacity can reach 7200 t/h. The research results are of great significance to the development of railway container multimodal transport, the promotion of railway supply-side structural reform, and the promotion of green and low-carbon development of integrated transportation.

In order to study the influence of surface structure screening plant on the stability of the west end slope, the mining area of Hongshaquan open-pit coal Mine was taken as the research object. Based on the limit equilibrium theory, numerical simulation and other means, the Bioshop slope stability calculation method was adopted to compare the application of surface load or no surface load respectively. The local stability law of the influence of the surface screening plant on the upper and lower part of the west end slope and the influence on the whole stability of the west end slope are explored. The results show that when the surface load of the upper part slope increases, the slope is less affected, so more attention should be paid to the influence of surface load on the stability of the lower part slope and the whole slope. Under the condition that the total weight of equipment, coal storage and equipment transportation of the surface building screening plant does not exceed 500tons and is located 55m away from the top of the slope, the stability of the overall slope is not affected by the surface load, but the stability of the lower part of the slope is slightly reduced. Based on the numerical simulation calculation, it is recommended that the total weight of the surface screening plant should not exceed 200 thousand tons.

In order to analyze the influence of the rotation of the maximum principal stress direction of the roof on the deformation and damage of the roof, taking the 25221 working face of 2130 mine of Xinjiang Coking Coal Group as the background, the roof failure and the evolution characteristics of the rock structure are analyzed by the physical similarity simulation experiment and FLAC3D numerical simulation method, the maximum principal stress direction deflection and its impact on the roof damage. On this basis, the roof mechanical model is established to discuss the distribution characteristics of the roof deflection. With the advancement of coal mining, the range of bearing arch above the roof failure envelope increases, and the arch extends to the middle and upper part of the rock stratum; The contour distribution pattern of the maximum principal stress direction of the roof gradually evolves from "m" to "n" type (The maximum principal stress direction of the roof in the middle and upper part of the goaf deflects greatly). Under the synergetic effect of the principal stress direction deflection and the optimal expansion crack angle, the middle and upper parts of the roof are damaged and migrate to the high level rock stratum, gradually; Establish the roof mechanical model, and substitute the roof data into the calculation through Python programming, so that the deflection peak value, along the tendency, will appear at 4/5 of the roof.

Aiming at the problem of determining the development height of water flowing fractured zone after close-distance coal seam mining, 13 groups of experiments were designed by Box-Behnken method and the development height of water flowing fractured zone in each group of experiments was obtained by numerical simulation. The influence of the interaction of the three factors of cumulative coal thickness, working face length and advancing distance on the development height of water flowing fractured zone in close-distance coal seam was systematically analyzed. A quadratic response surface model with the development height of water flowing fractured zone as the response value was constructed, and the stope parameters of the optimal three factors were obtained. The variance analysis of the simulation results shows that the cumulative coal thickness is the biggest factor affecting the development height of the water-conducting fracture zone. The weight of the factors affecting the development height of the water-conducting fracture zone is ranked from large to small : cumulative mining thickness, working face length, and advancing distance. At the same time, the optimal parameters of the three factors are : when the cumulative coal thickness is 12m, the working face length of 180m is the optimal parameter ; when the cumulative coal thickness is 20m, the working face length of 180m is the optimal parameter. When the cumulative coal thickness is 28m, the working face length of 200m is the optimal parameter. It provides some reference and guidance for coal mining under similar geological conditions.

The instability type of rock burst in the multi key layer coal pillar system of the deep fully mechanized mining face is a common type of rock burst in the deep mining area of Ordos. Currently, there is no unified and mature treatment plan on site, and the occurrence of rock burst still occurs from time to time. This article takes the 3102 working face of a Coal Mine in the deep mining area of Ordos as the engineering background, and adopts methods such as theoretical analysis, numerical simulation, and on-site measurement, A study was conducted on the instability induced impact mechanism of the multi key layer coal pillar system in deep fully mechanized mining faces, and the following conclusions were drawn: the spatial structural evolution law of the deep multi key layer coal pillar system was explored, the loading mode of the section coal pillar bearing multi key layers was studied, the deformation and stress transformation function relationship of the multi key layer wide coal pillar system was analyzed, and the engineering criterion for instability induced impact of the multi key layer wide coal pillar system was derived. Revealed the instability induced impact mechanism of the deep multi key layer coal pillar system: when the goaf on both sides of the coal pillar is mined out, the low level "ILZ" and in-plane "DLZ" break the key rock group and load it to the wide coal pillar for compression deformation. Afterwards, the key rock group of the "DLZ" in the mining area flexes or even breaks, transferring stress to the loading section of the coal pillar. When its bearing stress exceeds the instability threshold, the overall instability impact occurs. Numerical simulation was conducted to study the changes in stress magnitude and distribution characteristics of coal pillars in different shrinkage width conditions in the mining area. As the width of the bearing coal pillars in the section increases, the stress distribution characteristics transition from a platform type to a saddle type, and the degree of stress concentration and overall impact risk level continue to decrease. Field measurements have verified the anti impact safety of the 120m section of coal pillars.

In the early stage of coal development, due to technical equipment issues, some mines only limited their thick coal seam mining to a portion, resulting in a waste of a large amount of high-quality coal resources. Based on the 2011 thick coal seam mining face of Yushuwan Coal Mine, this article comprehensively uses on-site measurement, UDEC numerical simulation, laboratory experiments, and theoretical analysis to study the development law of overlying rock water conducting fractures in the thick coal seam mining face of collaborative layered mining with thickness limit and filling. Numerical simulation shows that when the filling rate of the current layer filling mining reaches 70% or above, the development height of the water conducting fracture zone is 177.4 meters, and the lower layer mining has no impact on the Quaternary Salawusu Formation aquifer; The physical model cross validation test of the lower layer 70% filling mining shows that when the lower layer 70% filling mining is carried out, the development of overlying rock fractures is significantly slowed down, and the height of the development of the water conducting fracture zone is significantly reduced, only 179.7 meters. The water conducting fracture zone has not developed to the minimum waterproof protective layer, which can achieve safe and efficient mining of the ultra-thick coal seam under the Quaternary Salawusu Formation aquifer.

To address the problem of large redundancy in the audio data of belt conveyors, a method is proposed for identifying key audio data of belt conveyors based on the Improved Honey Badger Algorithm (IHBA) optimized Support Vector Machines (SVM). The Mel Frequency Cepstral Coefficients of the audio data are extracted as features; The Tent chaos mapping is used to increase population diversity, and new density factor and golden sine mechanism are introduced to overcome the defects of the Honey Badger Algorithm (HBA), such as easy to fall into local optimum, slow convergence speed, and low accuracy in finding the best solution. The performance of IHBA is verified through simulation experiments using standard test functions. The parameters of SVM are optimized by IHBA, and the Mel Frequency Cepstral Coefficients are input into the IHBA-SVM model for identification. The results indicate that the IHBA-SVM model can effectively improve the identification rate of key audio data from belt conveyors.

Under the influence of alternating shock loads, the oil of the cutting reducer of cantilever road-header is easy to fail prematurely, which seriously affects the operation of the equipment. Therefore, a fuzzy deep learning model (FDD) based on Dropout layer is proposed to monitor the oil state in real time based on three indicators: viscosity, moisture, and particle number. Firstly, according to each index, the oil state is evaluated fuzzily and divided into four levels. Secondly, the index data is normalized as the input of the deep neural network, and then the ReLU activation function is used to activate the network, and an overfitting neural network is obtained. Then, by using the Dropout layer characteristics, the degree of network fitting is reduced, and genetic algorithms are used to optimize the hyperparameters in the model, thereby building a deep learning network model with high accuracy. Finally, the simulation data is used to train the model, and the actual data is used to verify the model. The results show that the FDD model can quickly monitor the oil state, the av-erage prediction accuracy reaches 97%, and the data loss is only 0.0018. At the same time, it solves the problem that the oil state characterization is difficult due to the inconsistency of multi-index information and the neural network training is difficult with less data in the oil monitoring process.

Intelligent mining of fully mechanized mining faces has become an important development trend in modern coal mining industry, and intelligent mining has become the necessary path for China's coal development. Intelligent perception, intelligent decision-making, and intelligent control are the three key elements of intelligent mining, among which intelligent perception is the most fundamental and critical part. In this process, the application of intelligent perception technology in this field is increasingly becoming a research hotspot. Intelligent perception technology plays a crucial role in improving mining efficiency, reducing production costs, and ensuring working face safety. This article reviews the development process of intelligent perception technology, analyzes the main characteristics of intelligent perception in different stages, conducts in-depth research and comprehensively explores the key technologies, widespread applications, and future development trends of intelligent perception technology in China's coal mine fully mechanized mining face, in order to provide reference for the intelligent transformation of the coal mine industry.

A deep learning-based efficient MIMO signal detection model for mining environments is proposed to address the low detection efficiency issue of intelligent receivers. The model consists of a nonlinear mapping network and an error correction network. The nonlinear mapping network is responsible for the initial recovery of received signals into binary bit signals, while the error correction network corrects the errors introduced by the nonlinear mapping network, thereby improving the signal detection accuracy. The performance of the proposed model is validated through simulations conducted in a mining MIMO communication system. The results demonstrate that the model outperforms traditional receivers in mining MIMO communication environments, especially when the modulation scheme at the transmitter, channel coding method, and channel environment change. Additionally, compared to deep receiver models, the proposed model achieves higher detection efficiency. This research presents a novel solution to the low decoding efficiency problem of intelligent receivers and provides evidence of the superior.

Coal mining produces a large amount of coal gangue. For example, recycling coal gangue as concrete coarse aggregate not only conforms to the concept of environmental protection, but also saves sand and stone and other natural resources. In order to investigate the mechanical properties of coal gangue concrete, the multiphase micromechanical properties of coal gangue concrete were studied. Based on the meso-scale, the heterogeneous numerical model of gangue concrete is established, and the influence of various internal media on the mechanical properties of gangue concrete is studied. The results show that the mesoscopic model can well describe the mechanical properties, failure mode and internal damage evolution process of gangue concrete. The mechanical properties of gangue concrete are related to the three-phase mechanical properties. With the increase of ITZ strength, the peak stress of gangue concrete first increases and then decreases, but the residual strength tends to be the same. The improvement of ITZ mechanical properties has little effect on the failure mode of gangue concrete and the distribution and propagation of macro-cracks. Increasing the strength of cement mortar can increase the peak stress and brittleness of coal gangue concrete. The strength of coarse aggregate increases the peak stress of concrete. When, the peak stress of concrete can be effectively increased. When, the peak stress growth rate will decrease rapidly. The brittleness of concrete can be improved by increasing the strength of aggregate.

To improve the efficiency of moist fine coal sorting and classification, a one-factor test of vibration intensity and air velocity was carried out on moist fine coal in a compound dry separator to obtain the optimal parameters, and the separating effect of raw coal with different moisture in different separating time was explored, while the influence of airflow on the separating process of moist fine coal was analyzed. The results show that with the increase of separating time, the separating effect is obviously improved, and the maximum ash segregation degree can be up to 12.05. the test coal samples reach the best separation effect at the air velocity of 0.78 m/s, the vibration frequency of 25 Hz, and the amplitude of 3 mm, and the separated products have good dewatering effect at this condition, and the dewatering effect of the concentrate coal is better. In this case, the possible deviation E=0.135 g/cm3, And the separated products have good dewatering effect under this condition, and the composite dry sorting can realize the quality enhancement of moist coal. This study can provide theoretical and technical support for the dry sorting process of fine coal.

Some disadvantages of the traditional frother addition mode, such as non-selective adsorption, etc. can be solved through a novel method that adsorbing frother vapor at the bubble surface from bubble inside. In this study, the thermal/kinetic bubble characteristics with vaporized Sec-octyl alcohol, methyl isobutyl carbinol (MIBC), and air at different temperatures were analyzed using a high-speed motion capture system. The results show that with the increase of vaporization temperature, the bubble aspect ratio gradually increases while the bubble volume decreases. The bubble volume follows the order of MIBC< Sec-octyl alcohol< air. The decrease in bubble surface tension and additional pressure with increasing vaporization temperature is the main factor causing the changes in bubble aspect ratio and volume. As the vaporization temperature increases, the terminal velocity of upward bubble decreases and the time of reaching the stable terminal velocity is shortened. The bubble kinetic energy decreases with increasing temperature. At the same va-porization temperature, the bubble kinetic energy of Sec-octyl alcohol is greater than that of MIBC. The sum of surface energy, kinetic energy, and potential energy of the bubble decreases with increasing the vapori-zation temperature.

The cyclonic micro bubble flotation column has better separation effect than the traditional flotation equipment in the separation of fine coal slime due to its small bubble size and strong secondary enrichment effect of foam. However, for other coal slimes that are difficult to float, such as flotation feed with high solid concentration and wide particle size composition, especially when coal quality fluctuates in many coal preparation plants, the flotation effect of cyclonic microbubble flotation is not ideal, which limits the application of cyclonic microbubble flotation column. In this paper, the research progress in improving the structure of cyclonic microbubble flotation column is summarized, and the separation effects of cyclonic microbubble flotation with different structures on three kinds of difficult to float slimes (coal slime with ultra-fine particles, with high solid concentration and with wide particle size) are analyzed. The results show that the cyclonic microbubble flotation column can meet the requirements of wide particle size fraction and high concentration flotation, and retain its good separation effect for fine slime through structural improvement.

High gas and coal and gas protrusion risk mines mainly use various types of gas boreholes to reduce coal seam gas concentration or eliminate protrusion risk. However, during the drilling process, a large amount of cinder and gas will gush out from the borehole, and there is a risk of frictional ignition, which seriously threatens the safety of the workers at the work site. In order to avoid gas, coal dust, and fire hazards during drilling, we developed a CBS-2 type triple prevention device, which is mainly composed of sealing casing, cinder separation box, secondary gas and dust separation box, control valve and anti-jet and dust removal brush, etc. Through on-site application, the actual gas concentration in the roadway is reduced by 77.8%, the gas concentration at the orifice is reduced by 97.4%, and the dust reduction amplitude is over 90%. The device meets the requirements of disaster prevention and control in the drilling construction of ordinary down-hole mine, improves the ability to prevent gas abnormalities, dust and fire during the construction of underground mine drill holes. All controls of the whole device are controlled by pneumatic valves, which can quickly improve the efficiency of gas discharge and also lay the foundation for the improvement of electric automatic control at a later stage.

There are serious throttling and overflow losses in the existing valve-controlled anchor drill system, which leads to low efficiency of the whole machine. In order to solve this problem, a new type of closed pump-controlled anchor drill system is proposed around the development goals of green and intelligent mining machinery and equipment. Through the method of combining theoretical analysis and co-simulation, firstly, the energy consumption characteristics of new type bolter and valve-controlled bolter are compared and studied. Secondly, an automatic speed regulation method based on pressure feedback is designed. Finally, the fuzzy adaptive PID is designed to control the closed-loop position of the propulsion cylinder in view of the serious nonlinear and low control precision of the pump control system. The results show that, compared with the traditional valve-controlled anchor drill, the power source of the new system is significantly reduced, the overall efficiency is greatly improved, and the energy saving effect is remarkable. The rotary motor can realize automatic speed regulation according to the change of pressure, and the error is less than 1%. Compared with PID control, the positioning error of drilling rig can be reduced by more than 70% when the fuzzy PID control is used in steady state.